sys/netinet/sctp_output.c

   1 /*-
   2  * SPDX-License-Identifier: BSD-3-Clause
   3  *
   4  * Copyright (c) 2001-2008, by Cisco Systems, Inc. All rights reserved.
   5  * Copyright (c) 2008-2012, by Randall Stewart. All rights reserved.
   6  * Copyright (c) 2008-2012, by Michael Tuexen. All rights reserved.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions are met:
  10  *
  11  * a) Redistributions of source code must retain the above copyright notice,
  12  *    this list of conditions and the following disclaimer.
  13  *
  14  * b) Redistributions in binary form must reproduce the above copyright
  15  *    notice, this list of conditions and the following disclaimer in
  16  *    the documentation and/or other materials provided with the distribution.
  17  *
  18  * c) Neither the name of Cisco Systems, Inc. nor the names of its
  19  *    contributors may be used to endorse or promote products derived
  20  *    from this software without specific prior written permission.
  21  *
  22  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  23  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
  24  * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  25  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
  26  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  27  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  28  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  29  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  30  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  31  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
  32  * THE POSSIBILITY OF SUCH DAMAGE.
  33  */
  34
  35 #include <netinet/sctp_os.h>
  36 #include <sys/proc.h>
  37 #include <netinet/sctp_var.h>
  38 #include <netinet/sctp_sysctl.h>
  39 #include <netinet/sctp_header.h>
  40 #include <netinet/sctp_pcb.h>
  41 #include <netinet/sctputil.h>
  42 #include <netinet/sctp_output.h>
  43 #include <netinet/sctp_uio.h>
  44 #include <netinet/sctputil.h>
  45 #include <netinet/sctp_auth.h>
  46 #include <netinet/sctp_timer.h>
  47 #include <netinet/sctp_asconf.h>
  48 #include <netinet/sctp_indata.h>
  49 #include <netinet/sctp_bsd_addr.h>
  50 #include <netinet/sctp_input.h>
  51 #include <netinet/sctp_crc32.h>
  52 #include <netinet/sctp_kdtrace.h>
  53 #if defined(INET) || defined(INET6)
  54 #include <netinet/udp.h>
  55 #endif
  56 #include <netinet/udp_var.h>
  57 #include <machine/in_cksum.h>
  58
  59 #define SCTP_MAX_GAPS_INARRAY 4
  60 struct sack_track {
  61         uint8_t right_edge;     /* mergable on the right edge */
  62         uint8_t left_edge;      /* mergable on the left edge */
  63         uint8_t num_entries;
  64         uint8_t spare;
  65         struct sctp_gap_ack_block gaps[SCTP_MAX_GAPS_INARRAY];
  66 };
  67
  68 const struct sack_track sack_array[256] = {
  69         {0, 0, 0, 0,            /* 0x00 */
  70                 {{0, 0},
  71                 {0, 0},
  72                 {0, 0},
  73                 {0, 0}
  74                 }
  75         },
  76         {1, 0, 1, 0,            /* 0x01 */
  77                 {{0, 0},
  78                 {0, 0},
  79                 {0, 0},
  80                 {0, 0}
  81                 }
  82         },
  83         {0, 0, 1, 0,            /* 0x02 */
  84                 {{1, 1},
  85                 {0, 0},
  86                 {0, 0},
  87                 {0, 0}
  88                 }
  89         },
  90         {1, 0, 1, 0,            /* 0x03 */
  91                 {{0, 1},
  92                 {0, 0},
  93                 {0, 0},
  94                 {0, 0}
  95                 }
  96         },
  97         {0, 0, 1, 0,            /* 0x04 */
  98                 {{2, 2},
  99                 {0, 0},
 100                 {0, 0},
 101                 {0, 0}
 102                 }
 103         },
 104         {1, 0, 2, 0,            /* 0x05 */
 105                 {{0, 0},
 106                 {2, 2},
 107                 {0, 0},
 108                 {0, 0}
 109                 }
 110         },
 111         {0, 0, 1, 0,            /* 0x06 */
 112                 {{1, 2},
 113                 {0, 0},
 114                 {0, 0},
 115                 {0, 0}
 116                 }
 117         },
 118         {1, 0, 1, 0,            /* 0x07 */
 119                 {{0, 2},
 120                 {0, 0},
 121                 {0, 0},
 122                 {0, 0}
 123                 }
 124         },
 125         {0, 0, 1, 0,            /* 0x08 */
 126                 {{3, 3},
 127                 {0, 0},
 128                 {0, 0},
 129                 {0, 0}
 130                 }
 131         },
 132         {1, 0, 2, 0,            /* 0x09 */
 133                 {{0, 0},
 134                 {3, 3},
 135                 {0, 0},
 136                 {0, 0}
 137                 }
 138         },
 139         {0, 0, 2, 0,            /* 0x0a */
 140                 {{1, 1},
 141                 {3, 3},
 142                 {0, 0},
 143                 {0, 0}
 144                 }
 145         },
 146         {1, 0, 2, 0,            /* 0x0b */
 147                 {{0, 1},
 148                 {3, 3},
 149                 {0, 0},
 150                 {0, 0}
 151                 }
 152         },
 153         {0, 0, 1, 0,            /* 0x0c */
 154                 {{2, 3},
 155                 {0, 0},
 156                 {0, 0},
 157                 {0, 0}
 158                 }
 159         },
 160         {1, 0, 2, 0,            /* 0x0d */
 161                 {{0, 0},
 162                 {2, 3},
 163                 {0, 0},
 164                 {0, 0}
 165                 }
 166         },
 167         {0, 0, 1, 0,            /* 0x0e */
 168                 {{1, 3},
 169                 {0, 0},
 170                 {0, 0},
 171                 {0, 0}
 172                 }
 173         },
 174         {1, 0, 1, 0,            /* 0x0f */
 175                 {{0, 3},
 176                 {0, 0},
 177                 {0, 0},
 178                 {0, 0}
 179                 }
 180         },
 181         {0, 0, 1, 0,            /* 0x10 */
 182                 {{4, 4},
 183                 {0, 0},
 184                 {0, 0},
 185                 {0, 0}
 186                 }
 187         },
 188         {1, 0, 2, 0,            /* 0x11 */
 189                 {{0, 0},
 190                 {4, 4},
 191                 {0, 0},
 192                 {0, 0}
 193                 }
 194         },
 195         {0, 0, 2, 0,            /* 0x12 */
 196                 {{1, 1},
 197                 {4, 4},
 198                 {0, 0},
 199                 {0, 0}
 200                 }
 201         },
 202         {1, 0, 2, 0,            /* 0x13 */
 203                 {{0, 1},
 204                 {4, 4},
 205                 {0, 0},
 206                 {0, 0}
 207                 }
 208         },
 209         {0, 0, 2, 0,            /* 0x14 */
 210                 {{2, 2},
 211                 {4, 4},
 212                 {0, 0},
 213                 {0, 0}
 214                 }
 215         },
 216         {1, 0, 3, 0,            /* 0x15 */
 217                 {{0, 0},
 218                 {2, 2},
 219                 {4, 4},
 220                 {0, 0}
 221                 }
 222         },
 223         {0, 0, 2, 0,            /* 0x16 */
 224                 {{1, 2},
 225                 {4, 4},
 226                 {0, 0},
 227                 {0, 0}
 228                 }
 229         },
 230         {1, 0, 2, 0,            /* 0x17 */
 231                 {{0, 2},
 232                 {4, 4},
 233                 {0, 0},
 234                 {0, 0}
 235                 }
 236         },
 237         {0, 0, 1, 0,            /* 0x18 */
 238                 {{3, 4},
 239                 {0, 0},
 240                 {0, 0},
 241                 {0, 0}
 242                 }
 243         },
 244         {1, 0, 2, 0,            /* 0x19 */
 245                 {{0, 0},
 246                 {3, 4},
 247                 {0, 0},
 248                 {0, 0}
 249                 }
 250         },
 251         {0, 0, 2, 0,            /* 0x1a */
 252                 {{1, 1},
 253                 {3, 4},
 254                 {0, 0},
 255                 {0, 0}
 256                 }
 257         },
 258         {1, 0, 2, 0,            /* 0x1b */
 259                 {{0, 1},
 260                 {3, 4},
 261                 {0, 0},
 262                 {0, 0}
 263                 }
 264         },
 265         {0, 0, 1, 0,            /* 0x1c */
 266                 {{2, 4},
 267                 {0, 0},
 268                 {0, 0},
 269                 {0, 0}
 270                 }
 271         },
 272         {1, 0, 2, 0,            /* 0x1d */
 273                 {{0, 0},
 274                 {2, 4},
 275                 {0, 0},
 276                 {0, 0}
 277                 }
 278         },
 279         {0, 0, 1, 0,            /* 0x1e */
 280                 {{1, 4},
 281                 {0, 0},
 282                 {0, 0},
 283                 {0, 0}
 284                 }
 285         },
 286         {1, 0, 1, 0,            /* 0x1f */
 287                 {{0, 4},
 288                 {0, 0},
 289                 {0, 0},
 290                 {0, 0}
 291                 }
 292         },
 293         {0, 0, 1, 0,            /* 0x20 */
 294                 {{5, 5},
 295                 {0, 0},
 296                 {0, 0},
 297                 {0, 0}
 298                 }
 299         },
 300         {1, 0, 2, 0,            /* 0x21 */
 301                 {{0, 0},
 302                 {5, 5},
 303                 {0, 0},
 304                 {0, 0}
 305                 }
 306         },
 307         {0, 0, 2, 0,            /* 0x22 */
 308                 {{1, 1},
 309                 {5, 5},
 310                 {0, 0},
 311                 {0, 0}
 312                 }
 313         },
 314         {1, 0, 2, 0,            /* 0x23 */
 315                 {{0, 1},
 316                 {5, 5},
 317                 {0, 0},
 318                 {0, 0}
 319                 }
 320         },
 321         {0, 0, 2, 0,            /* 0x24 */
 322                 {{2, 2},
 323                 {5, 5},
 324                 {0, 0},
 325                 {0, 0}
 326                 }
 327         },
 328         {1, 0, 3, 0,            /* 0x25 */
 329                 {{0, 0},
 330                 {2, 2},
 331                 {5, 5},
 332                 {0, 0}
 333                 }
 334         },
 335         {0, 0, 2, 0,            /* 0x26 */
 336                 {{1, 2},
 337                 {5, 5},
 338                 {0, 0},
 339                 {0, 0}
 340                 }
 341         },
 342         {1, 0, 2, 0,            /* 0x27 */
 343                 {{0, 2},
 344                 {5, 5},
 345                 {0, 0},
 346                 {0, 0}
 347                 }
 348         },
 349         {0, 0, 2, 0,            /* 0x28 */
 350                 {{3, 3},
 351                 {5, 5},
 352                 {0, 0},
 353                 {0, 0}
 354                 }
 355         },
 356         {1, 0, 3, 0,            /* 0x29 */
 357                 {{0, 0},
 358                 {3, 3},
 359                 {5, 5},
 360                 {0, 0}
 361                 }
 362         },
 363         {0, 0, 3, 0,            /* 0x2a */
 364                 {{1, 1},
 365                 {3, 3},
 366                 {5, 5},
 367                 {0, 0}
 368                 }
 369         },
 370         {1, 0, 3, 0,            /* 0x2b */
 371                 {{0, 1},
 372                 {3, 3},
 373                 {5, 5},
 374                 {0, 0}
 375                 }
 376         },
 377         {0, 0, 2, 0,            /* 0x2c */
 378                 {{2, 3},
 379                 {5, 5},
 380                 {0, 0},
 381                 {0, 0}
 382                 }
 383         },
 384         {1, 0, 3, 0,            /* 0x2d */
 385                 {{0, 0},
 386                 {2, 3},
 387                 {5, 5},
 388                 {0, 0}
 389                 }
 390         },
 391         {0, 0, 2, 0,            /* 0x2e */
 392                 {{1, 3},
 393                 {5, 5},
 394                 {0, 0},
 395                 {0, 0}
 396                 }
 397         },
 398         {1, 0, 2, 0,            /* 0x2f */
 399                 {{0, 3},
 400                 {5, 5},
 401                 {0, 0},
 402                 {0, 0}
 403                 }
 404         },
 405         {0, 0, 1, 0,            /* 0x30 */
 406                 {{4, 5},
 407                 {0, 0},
 408                 {0, 0},
 409                 {0, 0}
 410                 }
 411         },
 412         {1, 0, 2, 0,            /* 0x31 */
 413                 {{0, 0},
 414                 {4, 5},
 415                 {0, 0},
 416                 {0, 0}
 417                 }
 418         },
 419         {0, 0, 2, 0,            /* 0x32 */
 420                 {{1, 1},
 421                 {4, 5},
 422                 {0, 0},
 423                 {0, 0}
 424                 }
 425         },
 426         {1, 0, 2, 0,            /* 0x33 */
 427                 {{0, 1},
 428                 {4, 5},
 429                 {0, 0},
 430                 {0, 0}
 431                 }
 432         },
 433         {0, 0, 2, 0,            /* 0x34 */
 434                 {{2, 2},
 435                 {4, 5},
 436                 {0, 0},
 437                 {0, 0}
 438                 }
 439         },
 440         {1, 0, 3, 0,            /* 0x35 */
 441                 {{0, 0},
 442                 {2, 2},
 443                 {4, 5},
 444                 {0, 0}
 445                 }
 446         },
 447         {0, 0, 2, 0,            /* 0x36 */
 448                 {{1, 2},
 449                 {4, 5},
 450                 {0, 0},
 451                 {0, 0}
 452                 }
 453         },
 454         {1, 0, 2, 0,            /* 0x37 */
 455                 {{0, 2},
 456                 {4, 5},
 457                 {0, 0},
 458                 {0, 0}
 459                 }
 460         },
 461         {0, 0, 1, 0,            /* 0x38 */
 462                 {{3, 5},
 463                 {0, 0},
 464                 {0, 0},
 465                 {0, 0}
 466                 }
 467         },
 468         {1, 0, 2, 0,            /* 0x39 */
 469                 {{0, 0},
 470                 {3, 5},
 471                 {0, 0},
 472                 {0, 0}
 473                 }
 474         },
 475         {0, 0, 2, 0,            /* 0x3a */
 476                 {{1, 1},
 477                 {3, 5},
 478                 {0, 0},
 479                 {0, 0}
 480                 }
 481         },
 482         {1, 0, 2, 0,            /* 0x3b */
 483                 {{0, 1},
 484                 {3, 5},
 485                 {0, 0},
 486                 {0, 0}
 487                 }
 488         },
 489         {0, 0, 1, 0,            /* 0x3c */
 490                 {{2, 5},
 491                 {0, 0},
 492                 {0, 0},
 493                 {0, 0}
 494                 }
 495         },
 496         {1, 0, 2, 0,            /* 0x3d */
 497                 {{0, 0},
 498                 {2, 5},
 499                 {0, 0},
 500                 {0, 0}
 501                 }
 502         },
 503         {0, 0, 1, 0,            /* 0x3e */
 504                 {{1, 5},
 505                 {0, 0},
 506                 {0, 0},
 507                 {0, 0}
 508                 }
 509         },
 510         {1, 0, 1, 0,            /* 0x3f */
 511                 {{0, 5},
 512                 {0, 0},
 513                 {0, 0},
 514                 {0, 0}
 515                 }
 516         },
 517         {0, 0, 1, 0,            /* 0x40 */
 518                 {{6, 6},
 519                 {0, 0},
 520                 {0, 0},
 521                 {0, 0}
 522                 }
 523         },
 524         {1, 0, 2, 0,            /* 0x41 */
 525                 {{0, 0},
 526                 {6, 6},
 527                 {0, 0},
 528                 {0, 0}
 529                 }
 530         },
 531         {0, 0, 2, 0,            /* 0x42 */
 532                 {{1, 1},
 533                 {6, 6},
 534                 {0, 0},
 535                 {0, 0}
 536                 }
 537         },
 538         {1, 0, 2, 0,            /* 0x43 */
 539                 {{0, 1},
 540                 {6, 6},
 541                 {0, 0},
 542                 {0, 0}
 543                 }
 544         },
 545         {0, 0, 2, 0,            /* 0x44 */
 546                 {{2, 2},
 547                 {6, 6},
 548                 {0, 0},
 549                 {0, 0}
 550                 }
 551         },
 552         {1, 0, 3, 0,            /* 0x45 */
 553                 {{0, 0},
 554                 {2, 2},
 555                 {6, 6},
 556                 {0, 0}
 557                 }
 558         },
 559         {0, 0, 2, 0,            /* 0x46 */
 560                 {{1, 2},
 561                 {6, 6},
 562                 {0, 0},
 563                 {0, 0}
 564                 }
 565         },
 566         {1, 0, 2, 0,            /* 0x47 */
 567                 {{0, 2},
 568                 {6, 6},
 569                 {0, 0},
 570                 {0, 0}
 571                 }
 572         },
 573         {0, 0, 2, 0,            /* 0x48 */
 574                 {{3, 3},
 575                 {6, 6},
 576                 {0, 0},
 577                 {0, 0}
 578                 }
 579         },
 580         {1, 0, 3, 0,            /* 0x49 */
 581                 {{0, 0},
 582                 {3, 3},
 583                 {6, 6},
 584                 {0, 0}
 585                 }
 586         },
 587         {0, 0, 3, 0,            /* 0x4a */
 588                 {{1, 1},
 589                 {3, 3},
 590                 {6, 6},
 591                 {0, 0}
 592                 }
 593         },
 594         {1, 0, 3, 0,            /* 0x4b */
 595                 {{0, 1},
 596                 {3, 3},
 597                 {6, 6},
 598                 {0, 0}
 599                 }
 600         },
 601         {0, 0, 2, 0,            /* 0x4c */
 602                 {{2, 3},
 603                 {6, 6},
 604                 {0, 0},
 605                 {0, 0}
 606                 }
 607         },
 608         {1, 0, 3, 0,            /* 0x4d */
 609                 {{0, 0},
 610                 {2, 3},
 611                 {6, 6},
 612                 {0, 0}
 613                 }
 614         },
 615         {0, 0, 2, 0,            /* 0x4e */
 616                 {{1, 3},
 617                 {6, 6},
 618                 {0, 0},
 619                 {0, 0}
 620                 }
 621         },
 622         {1, 0, 2, 0,            /* 0x4f */
 623                 {{0, 3},
 624                 {6, 6},
 625                 {0, 0},
 626                 {0, 0}
 627                 }
 628         },
 629         {0, 0, 2, 0,            /* 0x50 */
 630                 {{4, 4},
 631                 {6, 6},
 632                 {0, 0},
 633                 {0, 0}
 634                 }
 635         },
 636         {1, 0, 3, 0,            /* 0x51 */
 637                 {{0, 0},
 638                 {4, 4},
 639                 {6, 6},
 640                 {0, 0}
 641                 }
 642         },
 643         {0, 0, 3, 0,            /* 0x52 */
 644                 {{1, 1},
 645                 {4, 4},
 646                 {6, 6},
 647                 {0, 0}
 648                 }
 649         },
 650         {1, 0, 3, 0,            /* 0x53 */
 651                 {{0, 1},
 652                 {4, 4},
 653                 {6, 6},
 654                 {0, 0}
 655                 }
 656         },
 657         {0, 0, 3, 0,            /* 0x54 */
 658                 {{2, 2},
 659                 {4, 4},
 660                 {6, 6},
 661                 {0, 0}
 662                 }
 663         },
 664         {1, 0, 4, 0,            /* 0x55 */
 665                 {{0, 0},
 666                 {2, 2},
 667                 {4, 4},
 668                 {6, 6}
 669                 }
 670         },
 671         {0, 0, 3, 0,            /* 0x56 */
 672                 {{1, 2},
 673                 {4, 4},
 674                 {6, 6},
 675                 {0, 0}
 676                 }
 677         },
 678         {1, 0, 3, 0,            /* 0x57 */
 679                 {{0, 2},
 680                 {4, 4},
 681                 {6, 6},
 682                 {0, 0}
 683                 }
 684         },
 685         {0, 0, 2, 0,            /* 0x58 */
 686                 {{3, 4},
 687                 {6, 6},
 688                 {0, 0},
 689                 {0, 0}
 690                 }
 691         },
 692         {1, 0, 3, 0,            /* 0x59 */
 693                 {{0, 0},
 694                 {3, 4},
 695                 {6, 6},
 696                 {0, 0}
 697                 }
 698         },
 699         {0, 0, 3, 0,            /* 0x5a */
 700                 {{1, 1},
 701                 {3, 4},
 702                 {6, 6},
 703                 {0, 0}
 704                 }
 705         },
 706         {1, 0, 3, 0,            /* 0x5b */
 707                 {{0, 1},
 708                 {3, 4},
 709                 {6, 6},
 710                 {0, 0}
 711                 }
 712         },
 713         {0, 0, 2, 0,            /* 0x5c */
 714                 {{2, 4},
 715                 {6, 6},
 716                 {0, 0},
 717                 {0, 0}
 718                 }
 719         },
 720         {1, 0, 3, 0,            /* 0x5d */
 721                 {{0, 0},
 722                 {2, 4},
 723                 {6, 6},
 724                 {0, 0}
 725                 }
 726         },
 727         {0, 0, 2, 0,            /* 0x5e */
 728                 {{1, 4},
 729                 {6, 6},
 730                 {0, 0},
 731                 {0, 0}
 732                 }
 733         },
 734         {1, 0, 2, 0,            /* 0x5f */
 735                 {{0, 4},
 736                 {6, 6},
 737                 {0, 0},
 738                 {0, 0}
 739                 }
 740         },
 741         {0, 0, 1, 0,            /* 0x60 */
 742                 {{5, 6},
 743                 {0, 0},
 744                 {0, 0},
 745                 {0, 0}
 746                 }
 747         },
 748         {1, 0, 2, 0,            /* 0x61 */
 749                 {{0, 0},
 750                 {5, 6},
 751                 {0, 0},
 752                 {0, 0}
 753                 }
 754         },
 755         {0, 0, 2, 0,            /* 0x62 */
 756                 {{1, 1},
 757                 {5, 6},
 758                 {0, 0},
 759                 {0, 0}
 760                 }
 761         },
 762         {1, 0, 2, 0,            /* 0x63 */
 763                 {{0, 1},
 764                 {5, 6},
 765                 {0, 0},
 766                 {0, 0}
 767                 }
 768         },
 769         {0, 0, 2, 0,            /* 0x64 */
 770                 {{2, 2},
 771                 {5, 6},
 772                 {0, 0},
 773                 {0, 0}
 774                 }
 775         },
 776         {1, 0, 3, 0,            /* 0x65 */
 777                 {{0, 0},
 778                 {2, 2},
 779                 {5, 6},
 780                 {0, 0}
 781                 }
 782         },
 783         {0, 0, 2, 0,            /* 0x66 */
 784                 {{1, 2},
 785                 {5, 6},
 786                 {0, 0},
 787                 {0, 0}
 788                 }
 789         },
 790         {1, 0, 2, 0,            /* 0x67 */
 791                 {{0, 2},
 792                 {5, 6},
 793                 {0, 0},
 794                 {0, 0}
 795                 }
 796         },
 797         {0, 0, 2, 0,            /* 0x68 */
 798                 {{3, 3},
 799                 {5, 6},
 800                 {0, 0},
 801                 {0, 0}
 802                 }
 803         },
 804         {1, 0, 3, 0,            /* 0x69 */
 805                 {{0, 0},
 806                 {3, 3},
 807                 {5, 6},
 808                 {0, 0}
 809                 }
 810         },
 811         {0, 0, 3, 0,            /* 0x6a */
 812                 {{1, 1},
 813                 {3, 3},
 814                 {5, 6},
 815                 {0, 0}
 816                 }
 817         },
 818         {1, 0, 3, 0,            /* 0x6b */
 819                 {{0, 1},
 820                 {3, 3},
 821                 {5, 6},
 822                 {0, 0}
 823                 }
 824         },
 825         {0, 0, 2, 0,            /* 0x6c */
 826                 {{2, 3},
 827                 {5, 6},
 828                 {0, 0},
 829                 {0, 0}
 830                 }
 831         },
 832         {1, 0, 3, 0,            /* 0x6d */
 833                 {{0, 0},
 834                 {2, 3},
 835                 {5, 6},
 836                 {0, 0}
 837                 }
 838         },
 839         {0, 0, 2, 0,            /* 0x6e */
 840                 {{1, 3},
 841                 {5, 6},
 842                 {0, 0},
 843                 {0, 0}
 844                 }
 845         },
 846         {1, 0, 2, 0,            /* 0x6f */
 847                 {{0, 3},
 848                 {5, 6},
 849                 {0, 0},
 850                 {0, 0}
 851                 }
 852         },
 853         {0, 0, 1, 0,            /* 0x70 */
 854                 {{4, 6},
 855                 {0, 0},
 856                 {0, 0},
 857                 {0, 0}
 858                 }
 859         },
 860         {1, 0, 2, 0,            /* 0x71 */
 861                 {{0, 0},
 862                 {4, 6},
 863                 {0, 0},
 864                 {0, 0}
 865                 }
 866         },
 867         {0, 0, 2, 0,            /* 0x72 */
 868                 {{1, 1},
 869                 {4, 6},
 870                 {0, 0},
 871                 {0, 0}
 872                 }
 873         },
 874         {1, 0, 2, 0,            /* 0x73 */
 875                 {{0, 1},
 876                 {4, 6},
 877                 {0, 0},
 878                 {0, 0}
 879                 }
 880         },
 881         {0, 0, 2, 0,            /* 0x74 */
 882                 {{2, 2},
 883                 {4, 6},
 884                 {0, 0},
 885                 {0, 0}
 886                 }
 887         },
 888         {1, 0, 3, 0,            /* 0x75 */
 889                 {{0, 0},
 890                 {2, 2},
 891                 {4, 6},
 892                 {0, 0}
 893                 }
 894         },
 895         {0, 0, 2, 0,            /* 0x76 */
 896                 {{1, 2},
 897                 {4, 6},
 898                 {0, 0},
 899                 {0, 0}
 900                 }
 901         },
 902         {1, 0, 2, 0,            /* 0x77 */
 903                 {{0, 2},
 904                 {4, 6},
 905                 {0, 0},
 906                 {0, 0}
 907                 }
 908         },
 909         {0, 0, 1, 0,            /* 0x78 */
 910                 {{3, 6},
 911                 {0, 0},
 912                 {0, 0},
 913                 {0, 0}
 914                 }
 915         },
 916         {1, 0, 2, 0,            /* 0x79 */
 917                 {{0, 0},
 918                 {3, 6},
 919                 {0, 0},
 920                 {0, 0}
 921                 }
 922         },
 923         {0, 0, 2, 0,            /* 0x7a */
 924                 {{1, 1},
 925                 {3, 6},
 926                 {0, 0},
 927                 {0, 0}
 928                 }
 929         },
 930         {1, 0, 2, 0,            /* 0x7b */
 931                 {{0, 1},
 932                 {3, 6},
 933                 {0, 0},
 934                 {0, 0}
 935                 }
 936         },
 937         {0, 0, 1, 0,            /* 0x7c */
 938                 {{2, 6},
 939                 {0, 0},
 940                 {0, 0},
 941                 {0, 0}
 942                 }
 943         },
 944         {1, 0, 2, 0,            /* 0x7d */
 945                 {{0, 0},
 946                 {2, 6},
 947                 {0, 0},
 948                 {0, 0}
 949                 }
 950         },
 951         {0, 0, 1, 0,            /* 0x7e */
 952                 {{1, 6},
 953                 {0, 0},
 954                 {0, 0},
 955                 {0, 0}
 956                 }
 957         },
 958         {1, 0, 1, 0,            /* 0x7f */
 959                 {{0, 6},
 960                 {0, 0},
 961                 {0, 0},
 962                 {0, 0}
 963                 }
 964         },
 965         {0, 1, 1, 0,            /* 0x80 */
 966                 {{7, 7},
 967                 {0, 0},
 968                 {0, 0},
 969                 {0, 0}
 970                 }
 971         },
 972         {1, 1, 2, 0,            /* 0x81 */
 973                 {{0, 0},
 974                 {7, 7},
 975                 {0, 0},
 976                 {0, 0}
 977                 }
 978         },
 979         {0, 1, 2, 0,            /* 0x82 */
 980                 {{1, 1},
 981                 {7, 7},
 982                 {0, 0},
 983                 {0, 0}
 984                 }
 985         },
 986         {1, 1, 2, 0,            /* 0x83 */
 987                 {{0, 1},
 988                 {7, 7},
 989                 {0, 0},
 990                 {0, 0}
 991                 }
 992         },
 993         {0, 1, 2, 0,            /* 0x84 */
 994                 {{2, 2},
 995                 {7, 7},
 996                 {0, 0},
 997                 {0, 0}
 998                 }
 999         },
1000         {1, 1, 3, 0,            /* 0x85 */
1001                 {{0, 0},
1002                 {2, 2},
1003                 {7, 7},
1004                 {0, 0}
1005                 }
1006         },
1007         {0, 1, 2, 0,            /* 0x86 */
1008                 {{1, 2},
1009                 {7, 7},
1010                 {0, 0},
1011                 {0, 0}
1012                 }
1013         },
1014         {1, 1, 2, 0,            /* 0x87 */
1015                 {{0, 2},
1016                 {7, 7},
1017                 {0, 0},
1018                 {0, 0}
1019                 }
1020         },
1021         {0, 1, 2, 0,            /* 0x88 */
1022                 {{3, 3},
1023                 {7, 7},
1024                 {0, 0},
1025                 {0, 0}
1026                 }
1027         },
1028         {1, 1, 3, 0,            /* 0x89 */
1029                 {{0, 0},
1030                 {3, 3},
1031                 {7, 7},
1032                 {0, 0}
1033                 }
1034         },
1035         {0, 1, 3, 0,            /* 0x8a */
1036                 {{1, 1},
1037                 {3, 3},
1038                 {7, 7},
1039                 {0, 0}
1040                 }
1041         },
1042         {1, 1, 3, 0,            /* 0x8b */
1043                 {{0, 1},
1044                 {3, 3},
1045                 {7, 7},
1046                 {0, 0}
1047                 }
1048         },
1049         {0, 1, 2, 0,            /* 0x8c */
1050                 {{2, 3},
1051                 {7, 7},
1052                 {0, 0},
1053                 {0, 0}
1054                 }
1055         },
1056         {1, 1, 3, 0,            /* 0x8d */
1057                 {{0, 0},
1058                 {2, 3},
1059                 {7, 7},
1060                 {0, 0}
1061                 }
1062         },
1063         {0, 1, 2, 0,            /* 0x8e */
1064                 {{1, 3},
1065                 {7, 7},
1066                 {0, 0},
1067                 {0, 0}
1068                 }
1069         },
1070         {1, 1, 2, 0,            /* 0x8f */
1071                 {{0, 3},
1072                 {7, 7},
1073                 {0, 0},
1074                 {0, 0}
1075                 }
1076         },
1077         {0, 1, 2, 0,            /* 0x90 */
1078                 {{4, 4},
1079                 {7, 7},
1080                 {0, 0},
1081                 {0, 0}
1082                 }
1083         },
1084         {1, 1, 3, 0,            /* 0x91 */
1085                 {{0, 0},
1086                 {4, 4},
1087                 {7, 7},
1088                 {0, 0}
1089                 }
1090         },
1091         {0, 1, 3, 0,            /* 0x92 */
1092                 {{1, 1},
1093                 {4, 4},
1094                 {7, 7},
1095                 {0, 0}
1096                 }
1097         },
1098         {1, 1, 3, 0,            /* 0x93 */
1099                 {{0, 1},
1100                 {4, 4},
1101                 {7, 7},
1102                 {0, 0}
1103                 }
1104         },
1105         {0, 1, 3, 0,            /* 0x94 */
1106                 {{2, 2},
1107                 {4, 4},
1108                 {7, 7},
1109                 {0, 0}
1110                 }
1111         },
1112         {1, 1, 4, 0,            /* 0x95 */
1113                 {{0, 0},
1114                 {2, 2},
1115                 {4, 4},
1116                 {7, 7}
1117                 }
1118         },
1119         {0, 1, 3, 0,            /* 0x96 */
1120                 {{1, 2},
1121                 {4, 4},
1122                 {7, 7},
1123                 {0, 0}
1124                 }
1125         },
1126         {1, 1, 3, 0,            /* 0x97 */
1127                 {{0, 2},
1128                 {4, 4},
1129                 {7, 7},
1130                 {0, 0}
1131                 }
1132         },
1133         {0, 1, 2, 0,            /* 0x98 */
1134                 {{3, 4},
1135                 {7, 7},
1136                 {0, 0},
1137                 {0, 0}
1138                 }
1139         },
1140         {1, 1, 3, 0,            /* 0x99 */
1141                 {{0, 0},
1142                 {3, 4},
1143                 {7, 7},
1144                 {0, 0}
1145                 }
1146         },
1147         {0, 1, 3, 0,            /* 0x9a */
1148                 {{1, 1},
1149                 {3, 4},
1150                 {7, 7},
1151                 {0, 0}
1152                 }
1153         },
1154         {1, 1, 3, 0,            /* 0x9b */
1155                 {{0, 1},
1156                 {3, 4},
1157                 {7, 7},
1158                 {0, 0}
1159                 }
1160         },
1161         {0, 1, 2, 0,            /* 0x9c */
1162                 {{2, 4},
1163                 {7, 7},
1164                 {0, 0},
1165                 {0, 0}
1166                 }
1167         },
1168         {1, 1, 3, 0,            /* 0x9d */
1169                 {{0, 0},
1170                 {2, 4},
1171                 {7, 7},
1172                 {0, 0}
1173                 }
1174         },
1175         {0, 1, 2, 0,            /* 0x9e */
1176                 {{1, 4},
1177                 {7, 7},
1178                 {0, 0},
1179                 {0, 0}
1180                 }
1181         },
1182         {1, 1, 2, 0,            /* 0x9f */
1183                 {{0, 4},
1184                 {7, 7},
1185                 {0, 0},
1186                 {0, 0}
1187                 }
1188         },
1189         {0, 1, 2, 0,            /* 0xa0 */
1190                 {{5, 5},
1191                 {7, 7},
1192                 {0, 0},
1193                 {0, 0}
1194                 }
1195         },
1196         {1, 1, 3, 0,            /* 0xa1 */
1197                 {{0, 0},
1198                 {5, 5},
1199                 {7, 7},
1200                 {0, 0}
1201                 }
1202         },
1203         {0, 1, 3, 0,            /* 0xa2 */
1204                 {{1, 1},
1205                 {5, 5},
1206                 {7, 7},
1207                 {0, 0}
1208                 }
1209         },
1210         {1, 1, 3, 0,            /* 0xa3 */
1211                 {{0, 1},
1212                 {5, 5},
1213                 {7, 7},
1214                 {0, 0}
1215                 }
1216         },
1217         {0, 1, 3, 0,            /* 0xa4 */
1218                 {{2, 2},
1219                 {5, 5},
1220                 {7, 7},
1221                 {0, 0}
1222                 }
1223         },
1224         {1, 1, 4, 0,            /* 0xa5 */
1225                 {{0, 0},
1226                 {2, 2},
1227                 {5, 5},
1228                 {7, 7}
1229                 }
1230         },
1231         {0, 1, 3, 0,            /* 0xa6 */
1232                 {{1, 2},
1233                 {5, 5},
1234                 {7, 7},
1235                 {0, 0}
1236                 }
1237         },
1238         {1, 1, 3, 0,            /* 0xa7 */
1239                 {{0, 2},
1240                 {5, 5},
1241                 {7, 7},
1242                 {0, 0}
1243                 }
1244         },
1245         {0, 1, 3, 0,            /* 0xa8 */
1246                 {{3, 3},
1247                 {5, 5},
1248                 {7, 7},
1249                 {0, 0}
1250                 }
1251         },
1252         {1, 1, 4, 0,            /* 0xa9 */
1253                 {{0, 0},
1254                 {3, 3},
1255                 {5, 5},
1256                 {7, 7}
1257                 }
1258         },
1259         {0, 1, 4, 0,            /* 0xaa */
1260                 {{1, 1},
1261                 {3, 3},
1262                 {5, 5},
1263                 {7, 7}
1264                 }
1265         },
1266         {1, 1, 4, 0,            /* 0xab */
1267                 {{0, 1},
1268                 {3, 3},
1269                 {5, 5},
1270                 {7, 7}
1271                 }
1272         },
1273         {0, 1, 3, 0,            /* 0xac */
1274                 {{2, 3},
1275                 {5, 5},
1276                 {7, 7},
1277                 {0, 0}
1278                 }
1279         },
1280         {1, 1, 4, 0,            /* 0xad */
1281                 {{0, 0},
1282                 {2, 3},
1283                 {5, 5},
1284                 {7, 7}
1285                 }
1286         },
1287         {0, 1, 3, 0,            /* 0xae */
1288                 {{1, 3},
1289                 {5, 5},
1290                 {7, 7},
1291                 {0, 0}
1292                 }
1293         },
1294         {1, 1, 3, 0,            /* 0xaf */
1295                 {{0, 3},
1296                 {5, 5},
1297                 {7, 7},
1298                 {0, 0}
1299                 }
1300         },
1301         {0, 1, 2, 0,            /* 0xb0 */
1302                 {{4, 5},
1303                 {7, 7},
1304                 {0, 0},
1305                 {0, 0}
1306                 }
1307         },
1308         {1, 1, 3, 0,            /* 0xb1 */
1309                 {{0, 0},
1310                 {4, 5},
1311                 {7, 7},
1312                 {0, 0}
1313                 }
1314         },
1315         {0, 1, 3, 0,            /* 0xb2 */
1316                 {{1, 1},
1317                 {4, 5},
1318                 {7, 7},
1319                 {0, 0}
1320                 }
1321         },
1322         {1, 1, 3, 0,            /* 0xb3 */
1323                 {{0, 1},
1324                 {4, 5},
1325                 {7, 7},
1326                 {0, 0}
1327                 }
1328         },
1329         {0, 1, 3, 0,            /* 0xb4 */
1330                 {{2, 2},
1331                 {4, 5},
1332                 {7, 7},
1333                 {0, 0}
1334                 }
1335         },
1336         {1, 1, 4, 0,            /* 0xb5 */
1337                 {{0, 0},
1338                 {2, 2},
1339                 {4, 5},
1340                 {7, 7}
1341                 }
1342         },
1343         {0, 1, 3, 0,            /* 0xb6 */
1344                 {{1, 2},
1345                 {4, 5},
1346                 {7, 7},
1347                 {0, 0}
1348                 }
1349         },
1350         {1, 1, 3, 0,            /* 0xb7 */
1351                 {{0, 2},
1352                 {4, 5},
1353                 {7, 7},
1354                 {0, 0}
1355                 }
1356         },
1357         {0, 1, 2, 0,            /* 0xb8 */
1358                 {{3, 5},
1359                 {7, 7},
1360                 {0, 0},
1361                 {0, 0}
1362                 }
1363         },
1364         {1, 1, 3, 0,            /* 0xb9 */
1365                 {{0, 0},
1366                 {3, 5},
1367                 {7, 7},
1368                 {0, 0}
1369                 }
1370         },
1371         {0, 1, 3, 0,            /* 0xba */
1372                 {{1, 1},
1373                 {3, 5},
1374                 {7, 7},
1375                 {0, 0}
1376                 }
1377         },
1378         {1, 1, 3, 0,            /* 0xbb */
1379                 {{0, 1},
1380                 {3, 5},
1381                 {7, 7},
1382                 {0, 0}
1383                 }
1384         },
1385         {0, 1, 2, 0,            /* 0xbc */
1386                 {{2, 5},
1387                 {7, 7},
1388                 {0, 0},
1389                 {0, 0}
1390                 }
1391         },
1392         {1, 1, 3, 0,            /* 0xbd */
1393                 {{0, 0},
1394                 {2, 5},
1395                 {7, 7},
1396                 {0, 0}
1397                 }
1398         },
1399         {0, 1, 2, 0,            /* 0xbe */
1400                 {{1, 5},
1401                 {7, 7},
1402                 {0, 0},
1403                 {0, 0}
1404                 }
1405         },
1406         {1, 1, 2, 0,            /* 0xbf */
1407                 {{0, 5},
1408                 {7, 7},
1409                 {0, 0},
1410                 {0, 0}
1411                 }
1412         },
1413         {0, 1, 1, 0,            /* 0xc0 */
1414                 {{6, 7},
1415                 {0, 0},
1416                 {0, 0},
1417                 {0, 0}
1418                 }
1419         },
1420         {1, 1, 2, 0,            /* 0xc1 */
1421                 {{0, 0},
1422                 {6, 7},
1423                 {0, 0},
1424                 {0, 0}
1425                 }
1426         },
1427         {0, 1, 2, 0,            /* 0xc2 */
1428                 {{1, 1},
1429                 {6, 7},
1430                 {0, 0},
1431                 {0, 0}
1432                 }
1433         },
1434         {1, 1, 2, 0,            /* 0xc3 */
1435                 {{0, 1},
1436                 {6, 7},
1437                 {0, 0},
1438                 {0, 0}
1439                 }
1440         },
1441         {0, 1, 2, 0,            /* 0xc4 */
1442                 {{2, 2},
1443                 {6, 7},
1444                 {0, 0},
1445                 {0, 0}
1446                 }
1447         },
1448         {1, 1, 3, 0,            /* 0xc5 */
1449                 {{0, 0},
1450                 {2, 2},
1451                 {6, 7},
1452                 {0, 0}
1453                 }
1454         },
1455         {0, 1, 2, 0,            /* 0xc6 */
1456                 {{1, 2},
1457                 {6, 7},
1458                 {0, 0},
1459                 {0, 0}
1460                 }
1461         },
1462         {1, 1, 2, 0,            /* 0xc7 */
1463                 {{0, 2},
1464                 {6, 7},
1465                 {0, 0},
1466                 {0, 0}
1467                 }
1468         },
1469         {0, 1, 2, 0,            /* 0xc8 */
1470                 {{3, 3},
1471                 {6, 7},
1472                 {0, 0},
1473                 {0, 0}
1474                 }
1475         },
1476         {1, 1, 3, 0,            /* 0xc9 */
1477                 {{0, 0},
1478                 {3, 3},
1479                 {6, 7},
1480                 {0, 0}
1481                 }
1482         },
1483         {0, 1, 3, 0,            /* 0xca */
1484                 {{1, 1},
1485                 {3, 3},
1486                 {6, 7},
1487                 {0, 0}
1488                 }
1489         },
1490         {1, 1, 3, 0,            /* 0xcb */
1491                 {{0, 1},
1492                 {3, 3},
1493                 {6, 7},
1494                 {0, 0}
1495                 }
1496         },
1497         {0, 1, 2, 0,            /* 0xcc */
1498                 {{2, 3},
1499                 {6, 7},
1500                 {0, 0},
1501                 {0, 0}
1502                 }
1503         },
1504         {1, 1, 3, 0,            /* 0xcd */
1505                 {{0, 0},
1506                 {2, 3},
1507                 {6, 7},
1508                 {0, 0}
1509                 }
1510         },
1511         {0, 1, 2, 0,            /* 0xce */
1512                 {{1, 3},
1513                 {6, 7},
1514                 {0, 0},
1515                 {0, 0}
1516                 }
1517         },
1518         {1, 1, 2, 0,            /* 0xcf */
1519                 {{0, 3},
1520                 {6, 7},
1521                 {0, 0},
1522                 {0, 0}
1523                 }
1524         },
1525         {0, 1, 2, 0,            /* 0xd0 */
1526                 {{4, 4},
1527                 {6, 7},
1528                 {0, 0},
1529                 {0, 0}
1530                 }
1531         },
1532         {1, 1, 3, 0,            /* 0xd1 */
1533                 {{0, 0},
1534                 {4, 4},
1535                 {6, 7},
1536                 {0, 0}
1537                 }
1538         },
1539         {0, 1, 3, 0,            /* 0xd2 */
1540                 {{1, 1},
1541                 {4, 4},
1542                 {6, 7},
1543                 {0, 0}
1544                 }
1545         },
1546         {1, 1, 3, 0,            /* 0xd3 */
1547                 {{0, 1},
1548                 {4, 4},
1549                 {6, 7},
1550                 {0, 0}
1551                 }
1552         },
1553         {0, 1, 3, 0,            /* 0xd4 */
1554                 {{2, 2},
1555                 {4, 4},
1556                 {6, 7},
1557                 {0, 0}
1558                 }
1559         },
1560         {1, 1, 4, 0,            /* 0xd5 */
1561                 {{0, 0},
1562                 {2, 2},
1563                 {4, 4},
1564                 {6, 7}
1565                 }
1566         },
1567         {0, 1, 3, 0,            /* 0xd6 */
1568                 {{1, 2},
1569                 {4, 4},
1570                 {6, 7},
1571                 {0, 0}
1572                 }
1573         },
1574         {1, 1, 3, 0,            /* 0xd7 */
1575                 {{0, 2},
1576                 {4, 4},
1577                 {6, 7},
1578                 {0, 0}
1579                 }
1580         },
1581         {0, 1, 2, 0,            /* 0xd8 */
1582                 {{3, 4},
1583                 {6, 7},
1584                 {0, 0},
1585                 {0, 0}
1586                 }
1587         },
1588         {1, 1, 3, 0,            /* 0xd9 */
1589                 {{0, 0},
1590                 {3, 4},
1591                 {6, 7},
1592                 {0, 0}
1593                 }
1594         },
1595         {0, 1, 3, 0,            /* 0xda */
1596                 {{1, 1},
1597                 {3, 4},
1598                 {6, 7},
1599                 {0, 0}
1600                 }
1601         },
1602         {1, 1, 3, 0,            /* 0xdb */
1603                 {{0, 1},
1604                 {3, 4},
1605                 {6, 7},
1606                 {0, 0}
1607                 }
1608         },
1609         {0, 1, 2, 0,            /* 0xdc */
1610                 {{2, 4},
1611                 {6, 7},
1612                 {0, 0},
1613                 {0, 0}
1614                 }
1615         },
1616         {1, 1, 3, 0,            /* 0xdd */
1617                 {{0, 0},
1618                 {2, 4},
1619                 {6, 7},
1620                 {0, 0}
1621                 }
1622         },
1623         {0, 1, 2, 0,            /* 0xde */
1624                 {{1, 4},
1625                 {6, 7},
1626                 {0, 0},
1627                 {0, 0}
1628                 }
1629         },
1630         {1, 1, 2, 0,            /* 0xdf */
1631                 {{0, 4},
1632                 {6, 7},
1633                 {0, 0},
1634                 {0, 0}
1635                 }
1636         },
1637         {0, 1, 1, 0,            /* 0xe0 */
1638                 {{5, 7},
1639                 {0, 0},
1640                 {0, 0},
1641                 {0, 0}
1642                 }
1643         },
1644         {1, 1, 2, 0,            /* 0xe1 */
1645                 {{0, 0},
1646                 {5, 7},
1647                 {0, 0},
1648                 {0, 0}
1649                 }
1650         },
1651         {0, 1, 2, 0,            /* 0xe2 */
1652                 {{1, 1},
1653                 {5, 7},
1654                 {0, 0},
1655                 {0, 0}
1656                 }
1657         },
1658         {1, 1, 2, 0,            /* 0xe3 */
1659                 {{0, 1},
1660                 {5, 7},
1661                 {0, 0},
1662                 {0, 0}
1663                 }
1664         },
1665         {0, 1, 2, 0,            /* 0xe4 */
1666                 {{2, 2},
1667                 {5, 7},
1668                 {0, 0},
1669                 {0, 0}
1670                 }
1671         },
1672         {1, 1, 3, 0,            /* 0xe5 */
1673                 {{0, 0},
1674                 {2, 2},
1675                 {5, 7},
1676                 {0, 0}
1677                 }
1678         },
1679         {0, 1, 2, 0,            /* 0xe6 */
1680                 {{1, 2},
1681                 {5, 7},
1682                 {0, 0},
1683                 {0, 0}
1684                 }
1685         },
1686         {1, 1, 2, 0,            /* 0xe7 */
1687                 {{0, 2},
1688                 {5, 7},
1689                 {0, 0},
1690                 {0, 0}
1691                 }
1692         },
1693         {0, 1, 2, 0,            /* 0xe8 */
1694                 {{3, 3},
1695                 {5, 7},
1696                 {0, 0},
1697                 {0, 0}
1698                 }
1699         },
1700         {1, 1, 3, 0,            /* 0xe9 */
1701                 {{0, 0},
1702                 {3, 3},
1703                 {5, 7},
1704                 {0, 0}
1705                 }
1706         },
1707         {0, 1, 3, 0,            /* 0xea */
1708                 {{1, 1},
1709                 {3, 3},
1710                 {5, 7},
1711                 {0, 0}
1712                 }
1713         },
1714         {1, 1, 3, 0,            /* 0xeb */
1715                 {{0, 1},
1716                 {3, 3},
1717                 {5, 7},
1718                 {0, 0}
1719                 }
1720         },
1721         {0, 1, 2, 0,            /* 0xec */
1722                 {{2, 3},
1723                 {5, 7},
1724                 {0, 0},
1725                 {0, 0}
1726                 }
1727         },
1728         {1, 1, 3, 0,            /* 0xed */
1729                 {{0, 0},
1730                 {2, 3},
1731                 {5, 7},
1732                 {0, 0}
1733                 }
1734         },
1735         {0, 1, 2, 0,            /* 0xee */
1736                 {{1, 3},
1737                 {5, 7},
1738                 {0, 0},
1739                 {0, 0}
1740                 }
1741         },
1742         {1, 1, 2, 0,            /* 0xef */
1743                 {{0, 3},
1744                 {5, 7},
1745                 {0, 0},
1746                 {0, 0}
1747                 }
1748         },
1749         {0, 1, 1, 0,            /* 0xf0 */
1750                 {{4, 7},
1751                 {0, 0},
1752                 {0, 0},
1753                 {0, 0}
1754                 }
1755         },
1756         {1, 1, 2, 0,            /* 0xf1 */
1757                 {{0, 0},
1758                 {4, 7},
1759                 {0, 0},
1760                 {0, 0}
1761                 }
1762         },
1763         {0, 1, 2, 0,            /* 0xf2 */
1764                 {{1, 1},
1765                 {4, 7},
1766                 {0, 0},
1767                 {0, 0}
1768                 }
1769         },
1770         {1, 1, 2, 0,            /* 0xf3 */
1771                 {{0, 1},
1772                 {4, 7},
1773                 {0, 0},
1774                 {0, 0}
1775                 }
1776         },
1777         {0, 1, 2, 0,            /* 0xf4 */
1778                 {{2, 2},
1779                 {4, 7},
1780                 {0, 0},
1781                 {0, 0}
1782                 }
1783         },
1784         {1, 1, 3, 0,            /* 0xf5 */
1785                 {{0, 0},
1786                 {2, 2},
1787                 {4, 7},
1788                 {0, 0}
1789                 }
1790         },
1791         {0, 1, 2, 0,            /* 0xf6 */
1792                 {{1, 2},
1793                 {4, 7},
1794                 {0, 0},
1795                 {0, 0}
1796                 }
1797         },
1798         {1, 1, 2, 0,            /* 0xf7 */
1799                 {{0, 2},
1800                 {4, 7},
1801                 {0, 0},
1802                 {0, 0}
1803                 }
1804         },
1805         {0, 1, 1, 0,            /* 0xf8 */
1806                 {{3, 7},
1807                 {0, 0},
1808                 {0, 0},
1809                 {0, 0}
1810                 }
1811         },
1812         {1, 1, 2, 0,            /* 0xf9 */
1813                 {{0, 0},
1814                 {3, 7},
1815                 {0, 0},
1816                 {0, 0}
1817                 }
1818         },
1819         {0, 1, 2, 0,            /* 0xfa */
1820                 {{1, 1},
1821                 {3, 7},
1822                 {0, 0},
1823                 {0, 0}
1824                 }
1825         },
1826         {1, 1, 2, 0,            /* 0xfb */
1827                 {{0, 1},
1828                 {3, 7},
1829                 {0, 0},
1830                 {0, 0}
1831                 }
1832         },
1833         {0, 1, 1, 0,            /* 0xfc */
1834                 {{2, 7},
1835                 {0, 0},
1836                 {0, 0},
1837                 {0, 0}
1838                 }
1839         },
1840         {1, 1, 2, 0,            /* 0xfd */
1841                 {{0, 0},
1842                 {2, 7},
1843                 {0, 0},
1844                 {0, 0}
1845                 }
1846         },
1847         {0, 1, 1, 0,            /* 0xfe */
1848                 {{1, 7},
1849                 {0, 0},
1850                 {0, 0},
1851                 {0, 0}
1852                 }
1853         },
1854         {1, 1, 1, 0,            /* 0xff */
1855                 {{0, 7},
1856                 {0, 0},
1857                 {0, 0},
1858                 {0, 0}
1859                 }
1860         }
1861 };
1862
1863 int
1864 sctp_is_address_in_scope(struct sctp_ifa *ifa,
1865     struct sctp_scoping *scope,
1866     int do_update)
1867 {
1868         if ((scope->loopback_scope == 0) &&
1869             (ifa->ifn_p) && SCTP_IFN_IS_IFT_LOOP(ifa->ifn_p)) {
1870                 /*
1871                  * skip loopback if not in scope *
1872                  */
1873                 return (0);
1874         }
1875         switch (ifa->address.sa.sa_family) {
1876 #ifdef INET
1877         case AF_INET:
1878                 if (scope->ipv4_addr_legal) {
1879                         struct sockaddr_in *sin;
1880
1881                         sin = &ifa->address.sin;
1882                         if (sin->sin_addr.s_addr == 0) {
1883                                 /* not in scope , unspecified */
1884                                 return (0);
1885                         }
1886                         if ((scope->ipv4_local_scope == 0) &&
1887                             (IN4_ISPRIVATE_ADDRESS(&sin->sin_addr))) {
1888                                 /* private address not in scope */
1889                                 return (0);
1890                         }
1891                 } else {
1892                         return (0);
1893                 }
1894                 break;
1895 #endif
1896 #ifdef INET6
1897         case AF_INET6:
1898                 if (scope->ipv6_addr_legal) {
1899                         struct sockaddr_in6 *sin6;
1900
1901                         /*
1902                          * Must update the flags,  bummer, which means any
1903                          * IFA locks must now be applied HERE <->
1904                          */
1905                         if (do_update) {
1906                                 sctp_gather_internal_ifa_flags(ifa);
1907                         }
1908                         if (ifa->localifa_flags & SCTP_ADDR_IFA_UNUSEABLE) {
1909                                 return (0);
1910                         }
1911                         /* ok to use deprecated addresses? */
1912                         sin6 = &ifa->address.sin6;
1913                         if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) {
1914                                 /* skip unspecified addresses */
1915                                 return (0);
1916                         }
1917                         if (    /* (local_scope == 0) && */
1918                             (IN6_IS_ADDR_LINKLOCAL(&sin6->sin6_addr))) {
1919                                 return (0);
1920                         }
1921                         if ((scope->site_scope == 0) &&
1922                             (IN6_IS_ADDR_SITELOCAL(&sin6->sin6_addr))) {
1923                                 return (0);
1924                         }
1925                 } else {
1926                         return (0);
1927                 }
1928                 break;
1929 #endif
1930         default:
1931                 return (0);
1932         }
1933         return (1);
1934 }
1935
1936 static struct mbuf *
1937 sctp_add_addr_to_mbuf(struct mbuf *m, struct sctp_ifa *ifa, uint16_t *len)
1938 {
1939 #if defined(INET) || defined(INET6)
1940         struct sctp_paramhdr *paramh;
1941         struct mbuf *mret;
1942         uint16_t plen;
1943 #endif
1944
1945         switch (ifa->address.sa.sa_family) {
1946 #ifdef INET
1947         case AF_INET:
1948                 plen = (uint16_t)sizeof(struct sctp_ipv4addr_param);
1949                 break;
1950 #endif
1951 #ifdef INET6
1952         case AF_INET6:
1953                 plen = (uint16_t)sizeof(struct sctp_ipv6addr_param);
1954                 break;
1955 #endif
1956         default:
1957                 return (m);
1958         }
1959 #if defined(INET) || defined(INET6)
1960         if (M_TRAILINGSPACE(m) >= plen) {
1961                 /* easy side we just drop it on the end */
1962                 paramh = (struct sctp_paramhdr *)(SCTP_BUF_AT(m, SCTP_BUF_LEN(m)));
1963                 mret = m;
1964         } else {
1965                 /* Need more space */
1966                 mret = m;
1967                 while (SCTP_BUF_NEXT(mret) != NULL) {
1968                         mret = SCTP_BUF_NEXT(mret);
1969                 }
1970                 SCTP_BUF_NEXT(mret) = sctp_get_mbuf_for_msg(plen, 0, M_NOWAIT, 1, MT_DATA);
1971                 if (SCTP_BUF_NEXT(mret) == NULL) {
1972                         /* We are hosed, can't add more addresses */
1973                         return (m);
1974                 }
1975                 mret = SCTP_BUF_NEXT(mret);
1976                 paramh = mtod(mret, struct sctp_paramhdr *);
1977         }
1978         /* now add the parameter */
1979         switch (ifa->address.sa.sa_family) {
1980 #ifdef INET
1981         case AF_INET:
1982                 {
1983                         struct sctp_ipv4addr_param *ipv4p;
1984                         struct sockaddr_in *sin;
1985
1986                         sin = &ifa->address.sin;
1987                         ipv4p = (struct sctp_ipv4addr_param *)paramh;
1988                         paramh->param_type = htons(SCTP_IPV4_ADDRESS);
1989                         paramh->param_length = htons(plen);
1990                         ipv4p->addr = sin->sin_addr.s_addr;
1991                         SCTP_BUF_LEN(mret) += plen;
1992                         break;
1993                 }
1994 #endif
1995 #ifdef INET6
1996         case AF_INET6:
1997                 {
1998                         struct sctp_ipv6addr_param *ipv6p;
1999                         struct sockaddr_in6 *sin6;
2000
2001                         sin6 = &ifa->address.sin6;
2002                         ipv6p = (struct sctp_ipv6addr_param *)paramh;
2003                         paramh->param_type = htons(SCTP_IPV6_ADDRESS);
2004                         paramh->param_length = htons(plen);
2005                         memcpy(ipv6p->addr, &sin6->sin6_addr,
2006                             sizeof(ipv6p->addr));
2007                         /* clear embedded scope in the address */
2008                         in6_clearscope((struct in6_addr *)ipv6p->addr);
2009                         SCTP_BUF_LEN(mret) += plen;
2010                         break;
2011                 }
2012 #endif
2013         default:
2014                 return (m);
2015         }
2016         if (len != NULL) {
2017                 *len += plen;
2018         }
2019         return (mret);
2020 #endif
2021 }
2022
2023 struct mbuf *
2024 sctp_add_addresses_to_i_ia(struct sctp_inpcb *inp, struct sctp_tcb *stcb,
2025     struct sctp_scoping *scope,
2026     struct mbuf *m_at, int cnt_inits_to,
2027     uint16_t *padding_len, uint16_t *chunk_len)
2028 {
2029         struct sctp_vrf *vrf = NULL;
2030         int cnt, limit_out = 0, total_count;
2031         uint32_t vrf_id;
2032
2033         vrf_id = inp->def_vrf_id;
2034         SCTP_IPI_ADDR_RLOCK();
2035         vrf = sctp_find_vrf(vrf_id);
2036         if (vrf == NULL) {
2037                 SCTP_IPI_ADDR_RUNLOCK();
2038                 return (m_at);
2039         }
2040         if (inp->sctp_flags & SCTP_PCB_FLAGS_BOUNDALL) {
2041                 struct sctp_ifa *sctp_ifap;
2042                 struct sctp_ifn *sctp_ifnp;
2043
2044                 cnt = cnt_inits_to;
2045                 if (vrf->total_ifa_count > SCTP_COUNT_LIMIT) {
2046                         limit_out = 1;
2047                         cnt = SCTP_ADDRESS_LIMIT;
2048                         goto skip_count;
2049                 }
2050                 LIST_FOREACH(sctp_ifnp, &vrf->ifnlist, next_ifn) {
2051                         if ((scope->loopback_scope == 0) &&
2052                             SCTP_IFN_IS_IFT_LOOP(sctp_ifnp)) {
2053                                 /*
2054                                  * Skip loopback devices if loopback_scope
2055                                  * not set
2056                                  */
2057                                 continue;
2058                         }
2059                         LIST_FOREACH(sctp_ifap, &sctp_ifnp->ifalist, next_ifa) {
2060 #ifdef INET
2061                                 if ((sctp_ifap->address.sa.sa_family == AF_INET) &&
2062                                     (prison_check_ip4(inp->ip_inp.inp.inp_cred,
2063                                     &sctp_ifap->address.sin.sin_addr) != 0)) {
2064                                         continue;
2065                                 }
2066 #endif
2067 #ifdef INET6
2068                                 if ((sctp_ifap->address.sa.sa_family == AF_INET6) &&
2069                                     (prison_check_ip6(inp->ip_inp.inp.inp_cred,
2070                                     &sctp_ifap->address.sin6.sin6_addr) != 0)) {
2071                                         continue;
2072                                 }
2073 #endif
2074                                 if (sctp_is_addr_restricted(stcb, sctp_ifap)) {
2075                                         continue;
2076                                 }
2077                                 if (sctp_is_address_in_scope(sctp_ifap, scope, 1) == 0) {
2078                                         continue;
2079                                 }
2080                                 cnt++;
2081                                 if (cnt > SCTP_ADDRESS_LIMIT) {
2082                                         break;
2083                                 }
2084                         }
2085                         if (cnt > SCTP_ADDRESS_LIMIT) {
2086                                 break;
2087                         }
2088                 }
2089 skip_count:
2090                 if (cnt > 1) {
2091                         total_count = 0;
2092                         LIST_FOREACH(sctp_ifnp, &vrf->ifnlist, next_ifn) {
2093                                 cnt = 0;
2094                                 if ((scope->loopback_scope == 0) &&
2095                                     SCTP_IFN_IS_IFT_LOOP(sctp_ifnp)) {
2096                                         /*
2097                                          * Skip loopback devices if
2098                                          * loopback_scope not set
2099                                          */
2100                                         continue;
2101                                 }
2102                                 LIST_FOREACH(sctp_ifap, &sctp_ifnp->ifalist, next_ifa) {
2103 #ifdef INET
2104                                         if ((sctp_ifap->address.sa.sa_family == AF_INET) &&
2105                                             (prison_check_ip4(inp->ip_inp.inp.inp_cred,
2106                                             &sctp_ifap->address.sin.sin_addr) != 0)) {
2107                                                 continue;
2108                                         }
2109 #endif
2110 #ifdef INET6
2111                                         if ((sctp_ifap->address.sa.sa_family == AF_INET6) &&
2112                                             (prison_check_ip6(inp->ip_inp.inp.inp_cred,
2113                                             &sctp_ifap->address.sin6.sin6_addr) != 0)) {
2114                                                 continue;
2115                                         }
2116 #endif
2117                                         if (sctp_is_addr_restricted(stcb, sctp_ifap)) {
2118                                                 continue;
2119                                         }
2120                                         if (sctp_is_address_in_scope(sctp_ifap,
2121                                             scope, 0) == 0) {
2122                                                 continue;
2123                                         }
2124                                         if ((chunk_len != NULL) &&
2125                                             (padding_len != NULL) &&
2126                                             (*padding_len > 0)) {
2127                                                 memset(mtod(m_at, caddr_t)+*chunk_len, 0, *padding_len);
2128                                                 SCTP_BUF_LEN(m_at) += *padding_len;
2129                                                 *chunk_len += *padding_len;
2130                                                 *padding_len = 0;
2131                                         }
2132                                         m_at = sctp_add_addr_to_mbuf(m_at, sctp_ifap, chunk_len);
2133                                         if (limit_out) {
2134                                                 cnt++;
2135                                                 total_count++;
2136                                                 if (cnt >= 2) {
2137                                                         /*
2138                                                          * two from each
2139                                                          * address
2140                                                          */
2141                                                         break;
2142                                                 }
2143                                                 if (total_count > SCTP_ADDRESS_LIMIT) {
2144                                                         /* No more addresses */
2145                                                         break;
2146                                                 }
2147                                         }
2148                                 }
2149                         }
2150                 }
2151         } else {
2152                 struct sctp_laddr *laddr;
2153
2154                 cnt = cnt_inits_to;
2155                 /* First, how many ? */
2156                 LIST_FOREACH(laddr, &inp->sctp_addr_list, sctp_nxt_addr) {
2157                         if (laddr->ifa == NULL) {
2158                                 continue;
2159                         }
2160                         if (laddr->ifa->localifa_flags & SCTP_BEING_DELETED)
2161                                 /*
2162                                  * Address being deleted by the system, dont
2163                                  * list.
2164                                  */
2165                                 continue;
2166                         if (laddr->action == SCTP_DEL_IP_ADDRESS) {
2167                                 /*
2168                                  * Address being deleted on this ep don't
2169                                  * list.
2170                                  */
2171                                 continue;
2172                         }
2173                         if (sctp_is_address_in_scope(laddr->ifa,
2174                             scope, 1) == 0) {
2175                                 continue;
2176                         }
2177                         cnt++;
2178                 }
2179                 /*
2180                  * To get through a NAT we only list addresses if we have
2181                  * more than one. That way if you just bind a single address
2182                  * we let the source of the init dictate our address.
2183                  */
2184                 if (cnt > 1) {
2185                         cnt = cnt_inits_to;
2186                         LIST_FOREACH(laddr, &inp->sctp_addr_list, sctp_nxt_addr) {
2187                                 if (laddr->ifa == NULL) {
2188                                         continue;
2189                                 }
2190                                 if (laddr->ifa->localifa_flags & SCTP_BEING_DELETED) {
2191                                         continue;
2192                                 }
2193                                 if (sctp_is_address_in_scope(laddr->ifa,
2194                                     scope, 0) == 0) {
2195                                         continue;
2196                                 }
2197                                 if ((chunk_len != NULL) &&
2198                                     (padding_len != NULL) &&
2199                                     (*padding_len > 0)) {
2200                                         memset(mtod(m_at, caddr_t)+*chunk_len, 0, *padding_len);
2201                                         SCTP_BUF_LEN(m_at) += *padding_len;
2202                                         *chunk_len += *padding_len;
2203                                         *padding_len = 0;
2204                                 }
2205                                 m_at = sctp_add_addr_to_mbuf(m_at, laddr->ifa, chunk_len);
2206                                 cnt++;
2207                                 if (cnt >= SCTP_ADDRESS_LIMIT) {
2208                                         break;
2209                                 }
2210                         }
2211                 }
2212         }
2213         SCTP_IPI_ADDR_RUNLOCK();
2214         return (m_at);
2215 }
2216
2217 static struct sctp_ifa *
2218 sctp_is_ifa_addr_preferred(struct sctp_ifa *ifa,
2219     uint8_t dest_is_loop,
2220     uint8_t dest_is_priv,
2221     sa_family_t fam)
2222 {
2223         uint8_t dest_is_global = 0;
2224
2225         /* dest_is_priv is true if destination is a private address */
2226         /* dest_is_loop is true if destination is a loopback addresses */
2227
2228         /**
2229          * Here we determine if its a preferred address. A preferred address
2230          * means it is the same scope or higher scope then the destination.
2231          * L = loopback, P = private, G = global
2232          * -----------------------------------------
2233          *    src    |  dest | result
2234          *  ----------------------------------------
2235          *     L     |    L  |    yes
2236          *  -----------------------------------------
2237          *     P     |    L  |    yes-v4 no-v6
2238          *  -----------------------------------------
2239          *     G     |    L  |    yes-v4 no-v6
2240          *  -----------------------------------------
2241          *     L     |    P  |    no
2242          *  -----------------------------------------
2243          *     P     |    P  |    yes
2244          *  -----------------------------------------
2245          *     G     |    P  |    no
2246          *   -----------------------------------------
2247          *     L     |    G  |    no
2248          *   -----------------------------------------
2249          *     P     |    G  |    no
2250          *    -----------------------------------------
2251          *     G     |    G  |    yes
2252          *    -----------------------------------------
2253          */
2254
2255         if (ifa->address.sa.sa_family != fam) {
2256                 /* forget mis-matched family */
2257                 return (NULL);
2258         }
2259         if ((dest_is_priv == 0) && (dest_is_loop == 0)) {
2260                 dest_is_global = 1;
2261         }
2262         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Is destination preferred:");
2263         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, &ifa->address.sa);
2264         /* Ok the address may be ok */
2265 #ifdef INET6
2266         if (fam == AF_INET6) {
2267                 /* ok to use deprecated addresses? no lets not! */
2268                 if (ifa->localifa_flags & SCTP_ADDR_IFA_UNUSEABLE) {
2269                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:1\n");
2270                         return (NULL);
2271                 }
2272                 if (ifa->src_is_priv && !ifa->src_is_loop) {
2273                         if (dest_is_loop) {
2274                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:2\n");
2275                                 return (NULL);
2276                         }
2277                 }
2278                 if (ifa->src_is_glob) {
2279                         if (dest_is_loop) {
2280                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:3\n");
2281                                 return (NULL);
2282                         }
2283                 }
2284         }
2285 #endif
2286         /*
2287          * Now that we know what is what, implement or table this could in
2288          * theory be done slicker (it used to be), but this is
2289          * straightforward and easier to validate :-)
2290          */
2291         SCTPDBG(SCTP_DEBUG_OUTPUT3, "src_loop:%d src_priv:%d src_glob:%d\n",
2292             ifa->src_is_loop, ifa->src_is_priv, ifa->src_is_glob);
2293         SCTPDBG(SCTP_DEBUG_OUTPUT3, "dest_loop:%d dest_priv:%d dest_glob:%d\n",
2294             dest_is_loop, dest_is_priv, dest_is_global);
2295
2296         if ((ifa->src_is_loop) && (dest_is_priv)) {
2297                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:4\n");
2298                 return (NULL);
2299         }
2300         if ((ifa->src_is_glob) && (dest_is_priv)) {
2301                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:5\n");
2302                 return (NULL);
2303         }
2304         if ((ifa->src_is_loop) && (dest_is_global)) {
2305                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:6\n");
2306                 return (NULL);
2307         }
2308         if ((ifa->src_is_priv) && (dest_is_global)) {
2309                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:7\n");
2310                 return (NULL);
2311         }
2312         SCTPDBG(SCTP_DEBUG_OUTPUT3, "YES\n");
2313         /* its a preferred address */
2314         return (ifa);
2315 }
2316
2317 static struct sctp_ifa *
2318 sctp_is_ifa_addr_acceptable(struct sctp_ifa *ifa,
2319     uint8_t dest_is_loop,
2320     uint8_t dest_is_priv,
2321     sa_family_t fam)
2322 {
2323         uint8_t dest_is_global = 0;
2324
2325         /**
2326          * Here we determine if its a acceptable address. A acceptable
2327          * address means it is the same scope or higher scope but we can
2328          * allow for NAT which means its ok to have a global dest and a
2329          * private src.
2330          *
2331          * L = loopback, P = private, G = global
2332          * -----------------------------------------
2333          *  src    |  dest | result
2334          * -----------------------------------------
2335          *   L     |   L   |    yes
2336          *  -----------------------------------------
2337          *   P     |   L   |    yes-v4 no-v6
2338          *  -----------------------------------------
2339          *   G     |   L   |    yes
2340          * -----------------------------------------
2341          *   L     |   P   |    no
2342          * -----------------------------------------
2343          *   P     |   P   |    yes
2344          * -----------------------------------------
2345          *   G     |   P   |    yes - May not work
2346          * -----------------------------------------
2347          *   L     |   G   |    no
2348          * -----------------------------------------
2349          *   P     |   G   |    yes - May not work
2350          * -----------------------------------------
2351          *   G     |   G   |    yes
2352          * -----------------------------------------
2353          */
2354
2355         if (ifa->address.sa.sa_family != fam) {
2356                 /* forget non matching family */
2357                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "ifa_fam:%d fam:%d\n",
2358                     ifa->address.sa.sa_family, fam);
2359                 return (NULL);
2360         }
2361         /* Ok the address may be ok */
2362         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT3, &ifa->address.sa);
2363         SCTPDBG(SCTP_DEBUG_OUTPUT3, "dst_is_loop:%d dest_is_priv:%d\n",
2364             dest_is_loop, dest_is_priv);
2365         if ((dest_is_loop == 0) && (dest_is_priv == 0)) {
2366                 dest_is_global = 1;
2367         }
2368 #ifdef INET6
2369         if (fam == AF_INET6) {
2370                 /* ok to use deprecated addresses? */
2371                 if (ifa->localifa_flags & SCTP_ADDR_IFA_UNUSEABLE) {
2372                         return (NULL);
2373                 }
2374                 if (ifa->src_is_priv) {
2375                         /* Special case, linklocal to loop */
2376                         if (dest_is_loop)
2377                                 return (NULL);
2378                 }
2379         }
2380 #endif
2381         /*
2382          * Now that we know what is what, implement our table. This could in
2383          * theory be done slicker (it used to be), but this is
2384          * straightforward and easier to validate :-)
2385          */
2386         SCTPDBG(SCTP_DEBUG_OUTPUT3, "ifa->src_is_loop:%d dest_is_priv:%d\n",
2387             ifa->src_is_loop,
2388             dest_is_priv);
2389         if ((ifa->src_is_loop == 1) && (dest_is_priv)) {
2390                 return (NULL);
2391         }
2392         SCTPDBG(SCTP_DEBUG_OUTPUT3, "ifa->src_is_loop:%d dest_is_glob:%d\n",
2393             ifa->src_is_loop,
2394             dest_is_global);
2395         if ((ifa->src_is_loop == 1) && (dest_is_global)) {
2396                 return (NULL);
2397         }
2398         SCTPDBG(SCTP_DEBUG_OUTPUT3, "address is acceptable\n");
2399         /* its an acceptable address */
2400         return (ifa);
2401 }
2402
2403 int
2404 sctp_is_addr_restricted(struct sctp_tcb *stcb, struct sctp_ifa *ifa)
2405 {
2406         struct sctp_laddr *laddr;
2407
2408         if (stcb == NULL) {
2409                 /* There are no restrictions, no TCB :-) */
2410                 return (0);
2411         }
2412         LIST_FOREACH(laddr, &stcb->asoc.sctp_restricted_addrs, sctp_nxt_addr) {
2413                 if (laddr->ifa == NULL) {
2414                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "%s: NULL ifa\n",
2415                             __func__);
2416                         continue;
2417                 }
2418                 if (laddr->ifa == ifa) {
2419                         /* Yes it is on the list */
2420                         return (1);
2421                 }
2422         }
2423         return (0);
2424 }
2425
2426 int
2427 sctp_is_addr_in_ep(struct sctp_inpcb *inp, struct sctp_ifa *ifa)
2428 {
2429         struct sctp_laddr *laddr;
2430
2431         if (ifa == NULL)
2432                 return (0);
2433         LIST_FOREACH(laddr, &inp->sctp_addr_list, sctp_nxt_addr) {
2434                 if (laddr->ifa == NULL) {
2435                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "%s: NULL ifa\n",
2436                             __func__);
2437                         continue;
2438                 }
2439                 if ((laddr->ifa == ifa) && laddr->action == 0)
2440                         /* same pointer */
2441                         return (1);
2442         }
2443         return (0);
2444 }
2445
2446 static struct sctp_ifa *
2447 sctp_choose_boundspecific_inp(struct sctp_inpcb *inp,
2448     sctp_route_t *ro,
2449     uint32_t vrf_id,
2450     int non_asoc_addr_ok,
2451     uint8_t dest_is_priv,
2452     uint8_t dest_is_loop,
2453     sa_family_t fam)
2454 {
2455         struct sctp_laddr *laddr, *starting_point;
2456         void *ifn;
2457         int resettotop = 0;
2458         struct sctp_ifn *sctp_ifn;
2459         struct sctp_ifa *sctp_ifa, *sifa;
2460         struct sctp_vrf *vrf;
2461         uint32_t ifn_index;
2462
2463         vrf = sctp_find_vrf(vrf_id);
2464         if (vrf == NULL)
2465                 return (NULL);
2466
2467         ifn = SCTP_GET_IFN_VOID_FROM_ROUTE(ro);
2468         ifn_index = SCTP_GET_IF_INDEX_FROM_ROUTE(ro);
2469         sctp_ifn = sctp_find_ifn(ifn, ifn_index);
2470         /*
2471          * first question, is the ifn we will emit on in our list, if so, we
2472          * want such an address. Note that we first looked for a preferred
2473          * address.
2474          */
2475         if (sctp_ifn) {
2476                 /* is a preferred one on the interface we route out? */
2477                 LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
2478 #ifdef INET
2479                         if ((sctp_ifa->address.sa.sa_family == AF_INET) &&
2480                             (prison_check_ip4(inp->ip_inp.inp.inp_cred,
2481                             &sctp_ifa->address.sin.sin_addr) != 0)) {
2482                                 continue;
2483                         }
2484 #endif
2485 #ifdef INET6
2486                         if ((sctp_ifa->address.sa.sa_family == AF_INET6) &&
2487                             (prison_check_ip6(inp->ip_inp.inp.inp_cred,
2488                             &sctp_ifa->address.sin6.sin6_addr) != 0)) {
2489                                 continue;
2490                         }
2491 #endif
2492                         if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
2493                             (non_asoc_addr_ok == 0))
2494                                 continue;
2495                         sifa = sctp_is_ifa_addr_preferred(sctp_ifa,
2496                             dest_is_loop,
2497                             dest_is_priv, fam);
2498                         if (sifa == NULL)
2499                                 continue;
2500                         if (sctp_is_addr_in_ep(inp, sifa)) {
2501                                 atomic_add_int(&sifa->refcount, 1);
2502                                 return (sifa);
2503                         }
2504                 }
2505         }
2506         /*
2507          * ok, now we now need to find one on the list of the addresses. We
2508          * can't get one on the emitting interface so let's find first a
2509          * preferred one. If not that an acceptable one otherwise... we
2510          * return NULL.
2511          */
2512         starting_point = inp->next_addr_touse;
2513 once_again:
2514         if (inp->next_addr_touse == NULL) {
2515                 inp->next_addr_touse = LIST_FIRST(&inp->sctp_addr_list);
2516                 resettotop = 1;
2517         }
2518         for (laddr = inp->next_addr_touse; laddr;
2519             laddr = LIST_NEXT(laddr, sctp_nxt_addr)) {
2520                 if (laddr->ifa == NULL) {
2521                         /* address has been removed */
2522                         continue;
2523                 }
2524                 if (laddr->action == SCTP_DEL_IP_ADDRESS) {
2525                         /* address is being deleted */
2526                         continue;
2527                 }
2528                 sifa = sctp_is_ifa_addr_preferred(laddr->ifa, dest_is_loop,
2529                     dest_is_priv, fam);
2530                 if (sifa == NULL)
2531                         continue;
2532                 atomic_add_int(&sifa->refcount, 1);
2533                 return (sifa);
2534         }
2535         if (resettotop == 0) {
2536                 inp->next_addr_touse = NULL;
2537                 goto once_again;
2538         }
2539
2540         inp->next_addr_touse = starting_point;
2541         resettotop = 0;
2542 once_again_too:
2543         if (inp->next_addr_touse == NULL) {
2544                 inp->next_addr_touse = LIST_FIRST(&inp->sctp_addr_list);
2545                 resettotop = 1;
2546         }
2547
2548         /* ok, what about an acceptable address in the inp */
2549         for (laddr = inp->next_addr_touse; laddr;
2550             laddr = LIST_NEXT(laddr, sctp_nxt_addr)) {
2551                 if (laddr->ifa == NULL) {
2552                         /* address has been removed */
2553                         continue;
2554                 }
2555                 if (laddr->action == SCTP_DEL_IP_ADDRESS) {
2556                         /* address is being deleted */
2557                         continue;
2558                 }
2559                 sifa = sctp_is_ifa_addr_acceptable(laddr->ifa, dest_is_loop,
2560                     dest_is_priv, fam);
2561                 if (sifa == NULL)
2562                         continue;
2563                 atomic_add_int(&sifa->refcount, 1);
2564                 return (sifa);
2565         }
2566         if (resettotop == 0) {
2567                 inp->next_addr_touse = NULL;
2568                 goto once_again_too;
2569         }
2570
2571         /*
2572          * no address bound can be a source for the destination we are in
2573          * trouble
2574          */
2575         return (NULL);
2576 }
2577
2578 static struct sctp_ifa *
2579 sctp_choose_boundspecific_stcb(struct sctp_inpcb *inp,
2580     struct sctp_tcb *stcb,
2581     sctp_route_t *ro,
2582     uint32_t vrf_id,
2583     uint8_t dest_is_priv,
2584     uint8_t dest_is_loop,
2585     int non_asoc_addr_ok,
2586     sa_family_t fam)
2587 {
2588         struct sctp_laddr *laddr, *starting_point;
2589         void *ifn;
2590         struct sctp_ifn *sctp_ifn;
2591         struct sctp_ifa *sctp_ifa, *sifa;
2592         uint8_t start_at_beginning = 0;
2593         struct sctp_vrf *vrf;
2594         uint32_t ifn_index;
2595
2596         /*
2597          * first question, is the ifn we will emit on in our list, if so, we
2598          * want that one.
2599          */
2600         vrf = sctp_find_vrf(vrf_id);
2601         if (vrf == NULL)
2602                 return (NULL);
2603
2604         ifn = SCTP_GET_IFN_VOID_FROM_ROUTE(ro);
2605         ifn_index = SCTP_GET_IF_INDEX_FROM_ROUTE(ro);
2606         sctp_ifn = sctp_find_ifn(ifn, ifn_index);
2607
2608         /*
2609          * first question, is the ifn we will emit on in our list?  If so,
2610          * we want that one. First we look for a preferred. Second, we go
2611          * for an acceptable.
2612          */
2613         if (sctp_ifn) {
2614                 /* first try for a preferred address on the ep */
2615                 LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
2616 #ifdef INET
2617                         if ((sctp_ifa->address.sa.sa_family == AF_INET) &&
2618                             (prison_check_ip4(inp->ip_inp.inp.inp_cred,
2619                             &sctp_ifa->address.sin.sin_addr) != 0)) {
2620                                 continue;
2621                         }
2622 #endif
2623 #ifdef INET6
2624                         if ((sctp_ifa->address.sa.sa_family == AF_INET6) &&
2625                             (prison_check_ip6(inp->ip_inp.inp.inp_cred,
2626                             &sctp_ifa->address.sin6.sin6_addr) != 0)) {
2627                                 continue;
2628                         }
2629 #endif
2630                         if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) && (non_asoc_addr_ok == 0))
2631                                 continue;
2632                         if (sctp_is_addr_in_ep(inp, sctp_ifa)) {
2633                                 sifa = sctp_is_ifa_addr_preferred(sctp_ifa, dest_is_loop, dest_is_priv, fam);
2634                                 if (sifa == NULL)
2635                                         continue;
2636                                 if (((non_asoc_addr_ok == 0) &&
2637                                     (sctp_is_addr_restricted(stcb, sifa))) ||
2638                                     (non_asoc_addr_ok &&
2639                                     (sctp_is_addr_restricted(stcb, sifa)) &&
2640                                     (!sctp_is_addr_pending(stcb, sifa)))) {
2641                                         /* on the no-no list */
2642                                         continue;
2643                                 }
2644                                 atomic_add_int(&sifa->refcount, 1);
2645                                 return (sifa);
2646                         }
2647                 }
2648                 /* next try for an acceptable address on the ep */
2649                 LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
2650 #ifdef INET
2651                         if ((sctp_ifa->address.sa.sa_family == AF_INET) &&
2652                             (prison_check_ip4(inp->ip_inp.inp.inp_cred,
2653                             &sctp_ifa->address.sin.sin_addr) != 0)) {
2654                                 continue;
2655                         }
2656 #endif
2657 #ifdef INET6
2658                         if ((sctp_ifa->address.sa.sa_family == AF_INET6) &&
2659                             (prison_check_ip6(inp->ip_inp.inp.inp_cred,
2660                             &sctp_ifa->address.sin6.sin6_addr) != 0)) {
2661                                 continue;
2662                         }
2663 #endif
2664                         if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) && (non_asoc_addr_ok == 0))
2665                                 continue;
2666                         if (sctp_is_addr_in_ep(inp, sctp_ifa)) {
2667                                 sifa = sctp_is_ifa_addr_acceptable(sctp_ifa, dest_is_loop, dest_is_priv, fam);
2668                                 if (sifa == NULL)
2669                                         continue;
2670                                 if (((non_asoc_addr_ok == 0) &&
2671                                     (sctp_is_addr_restricted(stcb, sifa))) ||
2672                                     (non_asoc_addr_ok &&
2673                                     (sctp_is_addr_restricted(stcb, sifa)) &&
2674                                     (!sctp_is_addr_pending(stcb, sifa)))) {
2675                                         /* on the no-no list */
2676                                         continue;
2677                                 }
2678                                 atomic_add_int(&sifa->refcount, 1);
2679                                 return (sifa);
2680                         }
2681                 }
2682         }
2683         /*
2684          * if we can't find one like that then we must look at all addresses
2685          * bound to pick one at first preferable then secondly acceptable.
2686          */
2687         starting_point = stcb->asoc.last_used_address;
2688 sctp_from_the_top:
2689         if (stcb->asoc.last_used_address == NULL) {
2690                 start_at_beginning = 1;
2691                 stcb->asoc.last_used_address = LIST_FIRST(&inp->sctp_addr_list);
2692         }
2693         /* search beginning with the last used address */
2694         for (laddr = stcb->asoc.last_used_address; laddr;
2695             laddr = LIST_NEXT(laddr, sctp_nxt_addr)) {
2696                 if (laddr->ifa == NULL) {
2697                         /* address has been removed */
2698                         continue;
2699                 }
2700                 if (laddr->action == SCTP_DEL_IP_ADDRESS) {
2701                         /* address is being deleted */
2702                         continue;
2703                 }
2704                 sifa = sctp_is_ifa_addr_preferred(laddr->ifa, dest_is_loop, dest_is_priv, fam);
2705                 if (sifa == NULL)
2706                         continue;
2707                 if (((non_asoc_addr_ok == 0) &&
2708                     (sctp_is_addr_restricted(stcb, sifa))) ||
2709                     (non_asoc_addr_ok &&
2710                     (sctp_is_addr_restricted(stcb, sifa)) &&
2711                     (!sctp_is_addr_pending(stcb, sifa)))) {
2712                         /* on the no-no list */
2713                         continue;
2714                 }
2715                 stcb->asoc.last_used_address = laddr;
2716                 atomic_add_int(&sifa->refcount, 1);
2717                 return (sifa);
2718         }
2719         if (start_at_beginning == 0) {
2720                 stcb->asoc.last_used_address = NULL;
2721                 goto sctp_from_the_top;
2722         }
2723         /* now try for any higher scope than the destination */
2724         stcb->asoc.last_used_address = starting_point;
2725         start_at_beginning = 0;
2726 sctp_from_the_top2:
2727         if (stcb->asoc.last_used_address == NULL) {
2728                 start_at_beginning = 1;
2729                 stcb->asoc.last_used_address = LIST_FIRST(&inp->sctp_addr_list);
2730         }
2731         /* search beginning with the last used address */
2732         for (laddr = stcb->asoc.last_used_address; laddr;
2733             laddr = LIST_NEXT(laddr, sctp_nxt_addr)) {
2734                 if (laddr->ifa == NULL) {
2735                         /* address has been removed */
2736                         continue;
2737                 }
2738                 if (laddr->action == SCTP_DEL_IP_ADDRESS) {
2739                         /* address is being deleted */
2740                         continue;
2741                 }
2742                 sifa = sctp_is_ifa_addr_acceptable(laddr->ifa, dest_is_loop,
2743                     dest_is_priv, fam);
2744                 if (sifa == NULL)
2745                         continue;
2746                 if (((non_asoc_addr_ok == 0) &&
2747                     (sctp_is_addr_restricted(stcb, sifa))) ||
2748                     (non_asoc_addr_ok &&
2749                     (sctp_is_addr_restricted(stcb, sifa)) &&
2750                     (!sctp_is_addr_pending(stcb, sifa)))) {
2751                         /* on the no-no list */
2752                         continue;
2753                 }
2754                 stcb->asoc.last_used_address = laddr;
2755                 atomic_add_int(&sifa->refcount, 1);
2756                 return (sifa);
2757         }
2758         if (start_at_beginning == 0) {
2759                 stcb->asoc.last_used_address = NULL;
2760                 goto sctp_from_the_top2;
2761         }
2762         return (NULL);
2763 }
2764
2765 static struct sctp_ifa *
2766 sctp_select_nth_preferred_addr_from_ifn_boundall(struct sctp_ifn *ifn,
2767     struct sctp_inpcb *inp,
2768     struct sctp_tcb *stcb,
2769     int non_asoc_addr_ok,
2770     uint8_t dest_is_loop,
2771     uint8_t dest_is_priv,
2772     int addr_wanted,
2773     sa_family_t fam,
2774     sctp_route_t *ro)
2775 {
2776         struct sctp_ifa *ifa, *sifa;
2777         int num_eligible_addr = 0;
2778 #ifdef INET6
2779         struct sockaddr_in6 sin6, lsa6;
2780
2781         if (fam == AF_INET6) {
2782                 memcpy(&sin6, &ro->ro_dst, sizeof(struct sockaddr_in6));
2783                 (void)sa6_recoverscope(&sin6);
2784         }
2785 #endif                          /* INET6 */
2786         LIST_FOREACH(ifa, &ifn->ifalist, next_ifa) {
2787 #ifdef INET
2788                 if ((ifa->address.sa.sa_family == AF_INET) &&
2789                     (prison_check_ip4(inp->ip_inp.inp.inp_cred,
2790                     &ifa->address.sin.sin_addr) != 0)) {
2791                         continue;
2792                 }
2793 #endif
2794 #ifdef INET6
2795                 if ((ifa->address.sa.sa_family == AF_INET6) &&
2796                     (prison_check_ip6(inp->ip_inp.inp.inp_cred,
2797                     &ifa->address.sin6.sin6_addr) != 0)) {
2798                         continue;
2799                 }
2800 #endif
2801                 if ((ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
2802                     (non_asoc_addr_ok == 0))
2803                         continue;
2804                 sifa = sctp_is_ifa_addr_preferred(ifa, dest_is_loop,
2805                     dest_is_priv, fam);
2806                 if (sifa == NULL)
2807                         continue;
2808 #ifdef INET6
2809                 if (fam == AF_INET6 &&
2810                     dest_is_loop &&
2811                     sifa->src_is_loop && sifa->src_is_priv) {
2812                         /*
2813                          * don't allow fe80::1 to be a src on loop ::1, we
2814                          * don't list it to the peer so we will get an
2815                          * abort.
2816                          */
2817                         continue;
2818                 }
2819                 if (fam == AF_INET6 &&
2820                     IN6_IS_ADDR_LINKLOCAL(&sifa->address.sin6.sin6_addr) &&
2821                     IN6_IS_ADDR_LINKLOCAL(&sin6.sin6_addr)) {
2822                         /*
2823                          * link-local <-> link-local must belong to the same
2824                          * scope.
2825                          */
2826                         memcpy(&lsa6, &sifa->address.sin6, sizeof(struct sockaddr_in6));
2827                         (void)sa6_recoverscope(&lsa6);
2828                         if (sin6.sin6_scope_id != lsa6.sin6_scope_id) {
2829                                 continue;
2830                         }
2831                 }
2832 #endif                          /* INET6 */
2833
2834                 /*
2835                  * Check if the IPv6 address matches to next-hop. In the
2836                  * mobile case, old IPv6 address may be not deleted from the
2837                  * interface. Then, the interface has previous and new
2838                  * addresses.  We should use one corresponding to the
2839                  * next-hop.  (by micchie)
2840                  */
2841 #ifdef INET6
2842                 if (stcb && fam == AF_INET6 &&
2843                     sctp_is_mobility_feature_on(stcb->sctp_ep, SCTP_MOBILITY_BASE)) {
2844                         if (sctp_v6src_match_nexthop(&sifa->address.sin6, ro) == 0) {
2845                                 continue;
2846                         }
2847                 }
2848 #endif
2849 #ifdef INET
2850                 /* Avoid topologically incorrect IPv4 address */
2851                 if (stcb && fam == AF_INET &&
2852                     sctp_is_mobility_feature_on(stcb->sctp_ep, SCTP_MOBILITY_BASE)) {
2853                         if (sctp_v4src_match_nexthop(sifa, ro) == 0) {
2854                                 continue;
2855                         }
2856                 }
2857 #endif
2858                 if (stcb) {
2859                         if (sctp_is_address_in_scope(ifa, &stcb->asoc.scope, 0) == 0) {
2860                                 continue;
2861                         }
2862                         if (((non_asoc_addr_ok == 0) &&
2863                             (sctp_is_addr_restricted(stcb, sifa))) ||
2864                             (non_asoc_addr_ok &&
2865                             (sctp_is_addr_restricted(stcb, sifa)) &&
2866                             (!sctp_is_addr_pending(stcb, sifa)))) {
2867                                 /*
2868                                  * It is restricted for some reason..
2869                                  * probably not yet added.
2870                                  */
2871                                 continue;
2872                         }
2873                 }
2874                 if (num_eligible_addr >= addr_wanted) {
2875                         return (sifa);
2876                 }
2877                 num_eligible_addr++;
2878         }
2879         return (NULL);
2880 }
2881
2882 static int
2883 sctp_count_num_preferred_boundall(struct sctp_ifn *ifn,
2884     struct sctp_inpcb *inp,
2885     struct sctp_tcb *stcb,
2886     int non_asoc_addr_ok,
2887     uint8_t dest_is_loop,
2888     uint8_t dest_is_priv,
2889     sa_family_t fam)
2890 {
2891         struct sctp_ifa *ifa, *sifa;
2892         int num_eligible_addr = 0;
2893
2894         LIST_FOREACH(ifa, &ifn->ifalist, next_ifa) {
2895 #ifdef INET
2896                 if ((ifa->address.sa.sa_family == AF_INET) &&
2897                     (prison_check_ip4(inp->ip_inp.inp.inp_cred,
2898                     &ifa->address.sin.sin_addr) != 0)) {
2899                         continue;
2900                 }
2901 #endif
2902 #ifdef INET6
2903                 if ((ifa->address.sa.sa_family == AF_INET6) &&
2904                     (stcb != NULL) &&
2905                     (prison_check_ip6(inp->ip_inp.inp.inp_cred,
2906                     &ifa->address.sin6.sin6_addr) != 0)) {
2907                         continue;
2908                 }
2909 #endif
2910                 if ((ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
2911                     (non_asoc_addr_ok == 0)) {
2912                         continue;
2913                 }
2914                 sifa = sctp_is_ifa_addr_preferred(ifa, dest_is_loop,
2915                     dest_is_priv, fam);
2916                 if (sifa == NULL) {
2917                         continue;
2918                 }
2919                 if (stcb) {
2920                         if (sctp_is_address_in_scope(ifa, &stcb->asoc.scope, 0) == 0) {
2921                                 continue;
2922                         }
2923                         if (((non_asoc_addr_ok == 0) &&
2924                             (sctp_is_addr_restricted(stcb, sifa))) ||
2925                             (non_asoc_addr_ok &&
2926                             (sctp_is_addr_restricted(stcb, sifa)) &&
2927                             (!sctp_is_addr_pending(stcb, sifa)))) {
2928                                 /*
2929                                  * It is restricted for some reason..
2930                                  * probably not yet added.
2931                                  */
2932                                 continue;
2933                         }
2934                 }
2935                 num_eligible_addr++;
2936         }
2937         return (num_eligible_addr);
2938 }
2939
2940 static struct sctp_ifa *
2941 sctp_choose_boundall(struct sctp_inpcb *inp,
2942     struct sctp_tcb *stcb,
2943     struct sctp_nets *net,
2944     sctp_route_t *ro,
2945     uint32_t vrf_id,
2946     uint8_t dest_is_priv,
2947     uint8_t dest_is_loop,
2948     int non_asoc_addr_ok,
2949     sa_family_t fam)
2950 {
2951         int cur_addr_num = 0, num_preferred = 0;
2952         void *ifn;
2953         struct sctp_ifn *sctp_ifn, *looked_at = NULL, *emit_ifn;
2954         struct sctp_ifa *sctp_ifa, *sifa;
2955         uint32_t ifn_index;
2956         struct sctp_vrf *vrf;
2957 #ifdef INET
2958         int retried = 0;
2959 #endif
2960
2961         /*-
2962          * For boundall we can use any address in the association.
2963          * If non_asoc_addr_ok is set we can use any address (at least in
2964          * theory). So we look for preferred addresses first. If we find one,
2965          * we use it. Otherwise we next try to get an address on the
2966          * interface, which we should be able to do (unless non_asoc_addr_ok
2967          * is false and we are routed out that way). In these cases where we
2968          * can't use the address of the interface we go through all the
2969          * ifn's looking for an address we can use and fill that in. Punting
2970          * means we send back address 0, which will probably cause problems
2971          * actually since then IP will fill in the address of the route ifn,
2972          * which means we probably already rejected it.. i.e. here comes an
2973          * abort :-<.
2974          */
2975         vrf = sctp_find_vrf(vrf_id);
2976         if (vrf == NULL)
2977                 return (NULL);
2978
2979         ifn = SCTP_GET_IFN_VOID_FROM_ROUTE(ro);
2980         ifn_index = SCTP_GET_IF_INDEX_FROM_ROUTE(ro);
2981         SCTPDBG(SCTP_DEBUG_OUTPUT2, "ifn from route:%p ifn_index:%d\n", ifn, ifn_index);
2982         emit_ifn = looked_at = sctp_ifn = sctp_find_ifn(ifn, ifn_index);
2983         if (sctp_ifn == NULL) {
2984                 /* ?? We don't have this guy ?? */
2985                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "No ifn emit interface?\n");
2986                 goto bound_all_plan_b;
2987         }
2988         SCTPDBG(SCTP_DEBUG_OUTPUT2, "ifn_index:%d name:%s is emit interface\n",
2989             ifn_index, sctp_ifn->ifn_name);
2990
2991         if (net) {
2992                 cur_addr_num = net->indx_of_eligible_next_to_use;
2993         }
2994         num_preferred = sctp_count_num_preferred_boundall(sctp_ifn,
2995             inp, stcb,
2996             non_asoc_addr_ok,
2997             dest_is_loop,
2998             dest_is_priv, fam);
2999         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Found %d preferred source addresses for intf:%s\n",
3000             num_preferred, sctp_ifn->ifn_name);
3001         if (num_preferred == 0) {
3002                 /*
3003                  * no eligible addresses, we must use some other interface
3004                  * address if we can find one.
3005                  */
3006                 goto bound_all_plan_b;
3007         }
3008         /*
3009          * Ok we have num_eligible_addr set with how many we can use, this
3010          * may vary from call to call due to addresses being deprecated
3011          * etc..
3012          */
3013         if (cur_addr_num >= num_preferred) {
3014                 cur_addr_num = 0;
3015         }
3016         /*
3017          * select the nth address from the list (where cur_addr_num is the
3018          * nth) and 0 is the first one, 1 is the second one etc...
3019          */
3020         SCTPDBG(SCTP_DEBUG_OUTPUT2, "cur_addr_num:%d\n", cur_addr_num);
3021
3022         sctp_ifa = sctp_select_nth_preferred_addr_from_ifn_boundall(sctp_ifn, inp, stcb, non_asoc_addr_ok, dest_is_loop,
3023             dest_is_priv, cur_addr_num, fam, ro);
3024
3025         /* if sctp_ifa is NULL something changed??, fall to plan b. */
3026         if (sctp_ifa) {
3027                 atomic_add_int(&sctp_ifa->refcount, 1);
3028                 if (net) {
3029                         /* save off where the next one we will want */
3030                         net->indx_of_eligible_next_to_use = cur_addr_num + 1;
3031                 }
3032                 return (sctp_ifa);
3033         }
3034         /*
3035          * plan_b: Look at all interfaces and find a preferred address. If
3036          * no preferred fall through to plan_c.
3037          */
3038 bound_all_plan_b:
3039         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Trying Plan B\n");
3040         LIST_FOREACH(sctp_ifn, &vrf->ifnlist, next_ifn) {
3041                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "Examine interface %s\n",
3042                     sctp_ifn->ifn_name);
3043                 if (dest_is_loop == 0 && SCTP_IFN_IS_IFT_LOOP(sctp_ifn)) {
3044                         /* wrong base scope */
3045                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "skip\n");
3046                         continue;
3047                 }
3048                 if ((sctp_ifn == looked_at) && looked_at) {
3049                         /* already looked at this guy */
3050                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "already seen\n");
3051                         continue;
3052                 }
3053                 num_preferred = sctp_count_num_preferred_boundall(sctp_ifn, inp, stcb, non_asoc_addr_ok,
3054                     dest_is_loop, dest_is_priv, fam);
3055                 SCTPDBG(SCTP_DEBUG_OUTPUT2,
3056                     "Found ifn:%p %d preferred source addresses\n",
3057                     ifn, num_preferred);
3058                 if (num_preferred == 0) {
3059                         /* None on this interface. */
3060                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "No preferred -- skipping to next\n");
3061                         continue;
3062                 }
3063                 SCTPDBG(SCTP_DEBUG_OUTPUT2,
3064                     "num preferred:%d on interface:%p cur_addr_num:%d\n",
3065                     num_preferred, (void *)sctp_ifn, cur_addr_num);
3066
3067                 /*
3068                  * Ok we have num_eligible_addr set with how many we can
3069                  * use, this may vary from call to call due to addresses
3070                  * being deprecated etc..
3071                  */
3072                 if (cur_addr_num >= num_preferred) {
3073                         cur_addr_num = 0;
3074                 }
3075                 sifa = sctp_select_nth_preferred_addr_from_ifn_boundall(sctp_ifn, inp, stcb, non_asoc_addr_ok, dest_is_loop,
3076                     dest_is_priv, cur_addr_num, fam, ro);
3077                 if (sifa == NULL)
3078                         continue;
3079                 if (net) {
3080                         net->indx_of_eligible_next_to_use = cur_addr_num + 1;
3081                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "we selected %d\n",
3082                             cur_addr_num);
3083                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Source:");
3084                         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, &sifa->address.sa);
3085                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Dest:");
3086                         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, &net->ro._l_addr.sa);
3087                 }
3088                 atomic_add_int(&sifa->refcount, 1);
3089                 return (sifa);
3090         }
3091 #ifdef INET
3092 again_with_private_addresses_allowed:
3093 #endif
3094         /* plan_c: do we have an acceptable address on the emit interface */
3095         sifa = NULL;
3096         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Trying Plan C: find acceptable on interface\n");
3097         if (emit_ifn == NULL) {
3098                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "Jump to Plan D - no emit_ifn\n");
3099                 goto plan_d;
3100         }
3101         LIST_FOREACH(sctp_ifa, &emit_ifn->ifalist, next_ifa) {
3102                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "ifa:%p\n", (void *)sctp_ifa);
3103 #ifdef INET
3104                 if ((sctp_ifa->address.sa.sa_family == AF_INET) &&
3105                     (prison_check_ip4(inp->ip_inp.inp.inp_cred,
3106                     &sctp_ifa->address.sin.sin_addr) != 0)) {
3107                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Jailed\n");
3108                         continue;
3109                 }
3110 #endif
3111 #ifdef INET6
3112                 if ((sctp_ifa->address.sa.sa_family == AF_INET6) &&
3113                     (prison_check_ip6(inp->ip_inp.inp.inp_cred,
3114                     &sctp_ifa->address.sin6.sin6_addr) != 0)) {
3115                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Jailed\n");
3116                         continue;
3117                 }
3118 #endif
3119                 if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
3120                     (non_asoc_addr_ok == 0)) {
3121                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Defer\n");
3122                         continue;
3123                 }
3124                 sifa = sctp_is_ifa_addr_acceptable(sctp_ifa, dest_is_loop,
3125                     dest_is_priv, fam);
3126                 if (sifa == NULL) {
3127                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "IFA not acceptable\n");
3128                         continue;
3129                 }
3130                 if (stcb) {
3131                         if (sctp_is_address_in_scope(sifa, &stcb->asoc.scope, 0) == 0) {
3132                                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "NOT in scope\n");
3133                                 sifa = NULL;
3134                                 continue;
3135                         }
3136                         if (((non_asoc_addr_ok == 0) &&
3137                             (sctp_is_addr_restricted(stcb, sifa))) ||
3138                             (non_asoc_addr_ok &&
3139                             (sctp_is_addr_restricted(stcb, sifa)) &&
3140                             (!sctp_is_addr_pending(stcb, sifa)))) {
3141                                 /*
3142                                  * It is restricted for some reason..
3143                                  * probably not yet added.
3144                                  */
3145                                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "Its restricted\n");
3146                                 sifa = NULL;
3147                                 continue;
3148                         }
3149                 }
3150                 atomic_add_int(&sifa->refcount, 1);
3151                 goto out;
3152         }
3153 plan_d:
3154         /*
3155          * plan_d: We are in trouble. No preferred address on the emit
3156          * interface. And not even a preferred address on all interfaces. Go
3157          * out and see if we can find an acceptable address somewhere
3158          * amongst all interfaces.
3159          */
3160         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Trying Plan D looked_at is %p\n", (void *)looked_at);
3161         LIST_FOREACH(sctp_ifn, &vrf->ifnlist, next_ifn) {
3162                 if (dest_is_loop == 0 && SCTP_IFN_IS_IFT_LOOP(sctp_ifn)) {
3163                         /* wrong base scope */
3164                         continue;
3165                 }
3166                 LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
3167 #ifdef INET
3168                         if ((sctp_ifa->address.sa.sa_family == AF_INET) &&
3169                             (prison_check_ip4(inp->ip_inp.inp.inp_cred,
3170                             &sctp_ifa->address.sin.sin_addr) != 0)) {
3171                                 continue;
3172                         }
3173 #endif
3174 #ifdef INET6
3175                         if ((sctp_ifa->address.sa.sa_family == AF_INET6) &&
3176                             (prison_check_ip6(inp->ip_inp.inp.inp_cred,
3177                             &sctp_ifa->address.sin6.sin6_addr) != 0)) {
3178                                 continue;
3179                         }
3180 #endif
3181                         if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
3182                             (non_asoc_addr_ok == 0))
3183                                 continue;
3184                         sifa = sctp_is_ifa_addr_acceptable(sctp_ifa,
3185                             dest_is_loop,
3186                             dest_is_priv, fam);
3187                         if (sifa == NULL)
3188                                 continue;
3189                         if (stcb) {
3190                                 if (sctp_is_address_in_scope(sifa, &stcb->asoc.scope, 0) == 0) {
3191                                         sifa = NULL;
3192                                         continue;
3193                                 }
3194                                 if (((non_asoc_addr_ok == 0) &&
3195                                     (sctp_is_addr_restricted(stcb, sifa))) ||
3196                                     (non_asoc_addr_ok &&
3197                                     (sctp_is_addr_restricted(stcb, sifa)) &&
3198                                     (!sctp_is_addr_pending(stcb, sifa)))) {
3199                                         /*
3200                                          * It is restricted for some
3201                                          * reason.. probably not yet added.
3202                                          */
3203                                         sifa = NULL;
3204                                         continue;
3205                                 }
3206                         }
3207                         goto out;
3208                 }
3209         }
3210 #ifdef INET
3211         if (stcb) {
3212                 if ((retried == 0) && (stcb->asoc.scope.ipv4_local_scope == 0)) {
3213                         stcb->asoc.scope.ipv4_local_scope = 1;
3214                         retried = 1;
3215                         goto again_with_private_addresses_allowed;
3216                 } else if (retried == 1) {
3217                         stcb->asoc.scope.ipv4_local_scope = 0;
3218                 }
3219         }
3220 #endif
3221 out:
3222 #ifdef INET
3223         if (sifa) {
3224                 if (retried == 1) {
3225                         LIST_FOREACH(sctp_ifn, &vrf->ifnlist, next_ifn) {
3226                                 if (dest_is_loop == 0 && SCTP_IFN_IS_IFT_LOOP(sctp_ifn)) {
3227                                         /* wrong base scope */
3228                                         continue;
3229                                 }
3230                                 LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
3231                                         struct sctp_ifa *tmp_sifa;
3232
3233 #ifdef INET
3234                                         if ((sctp_ifa->address.sa.sa_family == AF_INET) &&
3235                                             (prison_check_ip4(inp->ip_inp.inp.inp_cred,
3236                                             &sctp_ifa->address.sin.sin_addr) != 0)) {
3237                                                 continue;
3238                                         }
3239 #endif
3240 #ifdef INET6
3241                                         if ((sctp_ifa->address.sa.sa_family == AF_INET6) &&
3242                                             (prison_check_ip6(inp->ip_inp.inp.inp_cred,
3243                                             &sctp_ifa->address.sin6.sin6_addr) != 0)) {
3244                                                 continue;
3245                                         }
3246 #endif
3247                                         if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
3248                                             (non_asoc_addr_ok == 0))
3249                                                 continue;
3250                                         tmp_sifa = sctp_is_ifa_addr_acceptable(sctp_ifa,
3251                                             dest_is_loop,
3252                                             dest_is_priv, fam);
3253                                         if (tmp_sifa == NULL) {
3254                                                 continue;
3255                                         }
3256                                         if (tmp_sifa == sifa) {
3257                                                 continue;
3258                                         }
3259                                         if (stcb) {
3260                                                 if (sctp_is_address_in_scope(tmp_sifa,
3261                                                     &stcb->asoc.scope, 0) == 0) {
3262                                                         continue;
3263                                                 }
3264                                                 if (((non_asoc_addr_ok == 0) &&
3265                                                     (sctp_is_addr_restricted(stcb, tmp_sifa))) ||
3266                                                     (non_asoc_addr_ok &&
3267                                                     (sctp_is_addr_restricted(stcb, tmp_sifa)) &&
3268                                                     (!sctp_is_addr_pending(stcb, tmp_sifa)))) {
3269                                                         /*
3270                                                          * It is restricted
3271                                                          * for some reason..
3272                                                          * probably not yet
3273                                                          * added.
3274                                                          */
3275                                                         continue;
3276                                                 }
3277                                         }
3278                                         if ((tmp_sifa->address.sin.sin_family == AF_INET) &&
3279                                             (IN4_ISPRIVATE_ADDRESS(&(tmp_sifa->address.sin.sin_addr)))) {
3280                                                 sctp_add_local_addr_restricted(stcb, tmp_sifa);
3281                                         }
3282                                 }
3283                         }
3284                 }
3285                 atomic_add_int(&sifa->refcount, 1);
3286         }
3287 #endif
3288         return (sifa);
3289 }
3290
3291 /* tcb may be NULL */
3292 struct sctp_ifa *
3293 sctp_source_address_selection(struct sctp_inpcb *inp,
3294     struct sctp_tcb *stcb,
3295     sctp_route_t *ro,
3296     struct sctp_nets *net,
3297     int non_asoc_addr_ok, uint32_t vrf_id)
3298 {
3299         struct sctp_ifa *answer;
3300         uint8_t dest_is_priv, dest_is_loop;
3301         sa_family_t fam;
3302 #ifdef INET
3303         struct sockaddr_in *to = (struct sockaddr_in *)&ro->ro_dst;
3304 #endif
3305 #ifdef INET6
3306         struct sockaddr_in6 *to6 = (struct sockaddr_in6 *)&ro->ro_dst;
3307 #endif
3308
3309         /**
3310          * Rules:
3311          * - Find the route if needed, cache if I can.
3312          * - Look at interface address in route, Is it in the bound list. If so we
3313          *   have the best source.
3314          * - If not we must rotate amongst the addresses.
3315          *
3316          * Caveats and issues
3317          *
3318          * Do we need to pay attention to scope. We can have a private address
3319          * or a global address we are sourcing or sending to. So if we draw
3320          * it out
3321          * zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz
3322          * For V4
3323          * ------------------------------------------
3324          *      source     *      dest  *  result
3325          * -----------------------------------------
3326          * <a>  Private    *    Global  *  NAT
3327          * -----------------------------------------
3328          * <b>  Private    *    Private *  No problem
3329          * -----------------------------------------
3330          * <c>  Global     *    Private *  Huh, How will this work?
3331          * -----------------------------------------
3332          * <d>  Global     *    Global  *  No Problem
3333          *------------------------------------------
3334          * zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz
3335          * For V6
3336          *------------------------------------------
3337          *      source     *      dest  *  result
3338          * -----------------------------------------
3339          * <a>  Linklocal  *    Global  *
3340          * -----------------------------------------
3341          * <b>  Linklocal  * Linklocal  *  No problem
3342          * -----------------------------------------
3343          * <c>  Global     * Linklocal  *  Huh, How will this work?
3344          * -----------------------------------------
3345          * <d>  Global     *    Global  *  No Problem
3346          *------------------------------------------
3347          * zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz
3348          *
3349          * And then we add to that what happens if there are multiple addresses
3350          * assigned to an interface. Remember the ifa on a ifn is a linked
3351          * list of addresses. So one interface can have more than one IP
3352          * address. What happens if we have both a private and a global
3353          * address? Do we then use context of destination to sort out which
3354          * one is best? And what about NAT's sending P->G may get you a NAT
3355          * translation, or should you select the G thats on the interface in
3356          * preference.
3357          *
3358          * Decisions:
3359          *
3360          * - count the number of addresses on the interface.
3361          * - if it is one, no problem except case <c>.
3362          *   For <a> we will assume a NAT out there.
3363          * - if there are more than one, then we need to worry about scope P
3364          *   or G. We should prefer G -> G and P -> P if possible.
3365          *   Then as a secondary fall back to mixed types G->P being a last
3366          *   ditch one.
3367          * - The above all works for bound all, but bound specific we need to
3368          *   use the same concept but instead only consider the bound
3369          *   addresses. If the bound set is NOT assigned to the interface then
3370          *   we must use rotation amongst the bound addresses..
3371          */
3372         if (ro->ro_nh == NULL) {
3373                 /*
3374                  * Need a route to cache.
3375                  */
3376                 SCTP_RTALLOC(ro, vrf_id, inp->fibnum);
3377         }
3378         if (ro->ro_nh == NULL) {
3379                 return (NULL);
3380         }
3381         fam = ro->ro_dst.sa_family;
3382         dest_is_priv = dest_is_loop = 0;
3383         /* Setup our scopes for the destination */
3384         switch (fam) {
3385 #ifdef INET
3386         case AF_INET:
3387                 /* Scope based on outbound address */
3388                 if (IN4_ISLOOPBACK_ADDRESS(&to->sin_addr)) {
3389                         dest_is_loop = 1;
3390                         if (net != NULL) {
3391                                 /* mark it as local */
3392                                 net->addr_is_local = 1;
3393                         }
3394                 } else if ((IN4_ISPRIVATE_ADDRESS(&to->sin_addr))) {
3395                         dest_is_priv = 1;
3396                 }
3397                 break;
3398 #endif
3399 #ifdef INET6
3400         case AF_INET6:
3401                 /* Scope based on outbound address */
3402                 if (IN6_IS_ADDR_LOOPBACK(&to6->sin6_addr) ||
3403                     SCTP_ROUTE_IS_REAL_LOOP(ro)) {
3404                         /*
3405                          * If the address is a loopback address, which
3406                          * consists of "::1" OR "fe80::1%lo0", we are
3407                          * loopback scope. But we don't use dest_is_priv
3408                          * (link local addresses).
3409                          */
3410                         dest_is_loop = 1;
3411                         if (net != NULL) {
3412                                 /* mark it as local */
3413                                 net->addr_is_local = 1;
3414                         }
3415                 } else if (IN6_IS_ADDR_LINKLOCAL(&to6->sin6_addr)) {
3416                         dest_is_priv = 1;
3417                 }
3418                 break;
3419 #endif
3420         }
3421         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Select source addr for:");
3422         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)&ro->ro_dst);
3423         SCTP_IPI_ADDR_RLOCK();
3424         if (inp->sctp_flags & SCTP_PCB_FLAGS_BOUNDALL) {
3425                 /*
3426                  * Bound all case
3427                  */
3428                 answer = sctp_choose_boundall(inp, stcb, net, ro, vrf_id,
3429                     dest_is_priv, dest_is_loop,
3430                     non_asoc_addr_ok, fam);
3431                 SCTP_IPI_ADDR_RUNLOCK();
3432                 return (answer);
3433         }
3434         /*
3435          * Subset bound case
3436          */
3437         if (stcb) {
3438                 answer = sctp_choose_boundspecific_stcb(inp, stcb, ro,
3439                     vrf_id, dest_is_priv,
3440                     dest_is_loop,
3441                     non_asoc_addr_ok, fam);
3442         } else {
3443                 answer = sctp_choose_boundspecific_inp(inp, ro, vrf_id,
3444                     non_asoc_addr_ok,
3445                     dest_is_priv,
3446                     dest_is_loop, fam);
3447         }
3448         SCTP_IPI_ADDR_RUNLOCK();
3449         return (answer);
3450 }
3451
3452 static bool
3453 sctp_find_cmsg(int c_type, void *data, struct mbuf *control, size_t cpsize)
3454 {
3455         struct cmsghdr cmh;
3456         struct sctp_sndinfo sndinfo;
3457         struct sctp_prinfo prinfo;
3458         struct sctp_authinfo authinfo;
3459         int tot_len, rem_len, cmsg_data_len, cmsg_data_off, off;
3460         bool found;
3461
3462         /*
3463          * Independent of how many mbufs, find the c_type inside the control
3464          * structure and copy out the data.
3465          */
3466         found = false;
3467         tot_len = SCTP_BUF_LEN(control);
3468         for (off = 0; off < tot_len; off += CMSG_ALIGN(cmh.cmsg_len)) {
3469                 rem_len = tot_len - off;
3470                 if (rem_len < (int)CMSG_ALIGN(sizeof(cmh))) {
3471                         /* There is not enough room for one more. */
3472                         return (found);
3473                 }
3474                 m_copydata(control, off, sizeof(cmh), (caddr_t)&cmh);
3475                 if (cmh.cmsg_len < CMSG_ALIGN(sizeof(cmh))) {
3476                         /* We dont't have a complete CMSG header. */
3477                         return (found);
3478                 }
3479                 if ((cmh.cmsg_len > INT_MAX) || ((int)cmh.cmsg_len > rem_len)) {
3480                         /* We don't have the complete CMSG. */
3481                         return (found);
3482                 }
3483                 cmsg_data_len = (int)cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh));
3484                 cmsg_data_off = off + CMSG_ALIGN(sizeof(cmh));
3485                 if ((cmh.cmsg_level == IPPROTO_SCTP) &&
3486                     ((c_type == cmh.cmsg_type) ||
3487                     ((c_type == SCTP_SNDRCV) &&
3488                     ((cmh.cmsg_type == SCTP_SNDINFO) ||
3489                     (cmh.cmsg_type == SCTP_PRINFO) ||
3490                     (cmh.cmsg_type == SCTP_AUTHINFO))))) {
3491                         if (c_type == cmh.cmsg_type) {
3492                                 if (cpsize > INT_MAX) {
3493                                         return (found);
3494                                 }
3495                                 if (cmsg_data_len < (int)cpsize) {
3496                                         return (found);
3497                                 }
3498                                 /* It is exactly what we want. Copy it out. */
3499                                 m_copydata(control, cmsg_data_off, (int)cpsize, (caddr_t)data);
3500                                 return (1);
3501                         } else {
3502                                 struct sctp_sndrcvinfo *sndrcvinfo;
3503
3504                                 sndrcvinfo = (struct sctp_sndrcvinfo *)data;
3505                                 if (!found) {
3506                                         if (cpsize < sizeof(struct sctp_sndrcvinfo)) {
3507                                                 return (found);
3508                                         }
3509                                         memset(sndrcvinfo, 0, sizeof(struct sctp_sndrcvinfo));
3510                                 }
3511                                 switch (cmh.cmsg_type) {
3512                                 case SCTP_SNDINFO:
3513                                         if (cmsg_data_len < (int)sizeof(struct sctp_sndinfo)) {
3514                                                 return (found);
3515                                         }
3516                                         m_copydata(control, cmsg_data_off, sizeof(struct sctp_sndinfo), (caddr_t)&sndinfo);
3517                                         sndrcvinfo->sinfo_stream = sndinfo.snd_sid;
3518                                         sndrcvinfo->sinfo_flags = sndinfo.snd_flags;
3519                                         sndrcvinfo->sinfo_ppid = sndinfo.snd_ppid;
3520                                         sndrcvinfo->sinfo_context = sndinfo.snd_context;
3521                                         sndrcvinfo->sinfo_assoc_id = sndinfo.snd_assoc_id;
3522                                         break;
3523                                 case SCTP_PRINFO:
3524                                         if (cmsg_data_len < (int)sizeof(struct sctp_prinfo)) {
3525                                                 return (found);
3526                                         }
3527                                         m_copydata(control, cmsg_data_off, sizeof(struct sctp_prinfo), (caddr_t)&prinfo);
3528                                         if (prinfo.pr_policy != SCTP_PR_SCTP_NONE) {
3529                                                 sndrcvinfo->sinfo_timetolive = prinfo.pr_value;
3530                                         } else {
3531                                                 sndrcvinfo->sinfo_timetolive = 0;
3532                                         }
3533                                         sndrcvinfo->sinfo_flags |= prinfo.pr_policy;
3534                                         break;
3535                                 case SCTP_AUTHINFO:
3536                                         if (cmsg_data_len < (int)sizeof(struct sctp_authinfo)) {
3537                                                 return (found);
3538                                         }
3539                                         m_copydata(control, cmsg_data_off, sizeof(struct sctp_authinfo), (caddr_t)&authinfo);
3540                                         sndrcvinfo->sinfo_keynumber_valid = 1;
3541                                         sndrcvinfo->sinfo_keynumber = authinfo.auth_keynumber;
3542                                         break;
3543                                 default:
3544                                         return (found);
3545                                 }
3546                                 found = true;
3547                         }
3548                 }
3549         }
3550         return (found);
3551 }
3552
3553 static int
3554 sctp_process_cmsgs_for_init(struct sctp_tcb *stcb, struct mbuf *control, int *error)
3555 {
3556         struct cmsghdr cmh;
3557         struct sctp_initmsg initmsg;
3558 #ifdef INET
3559         struct sockaddr_in sin;
3560 #endif
3561 #ifdef INET6
3562         struct sockaddr_in6 sin6;
3563 #endif
3564         int tot_len, rem_len, cmsg_data_len, cmsg_data_off, off;
3565
3566         tot_len = SCTP_BUF_LEN(control);
3567         for (off = 0; off < tot_len; off += CMSG_ALIGN(cmh.cmsg_len)) {
3568                 rem_len = tot_len - off;
3569                 if (rem_len < (int)CMSG_ALIGN(sizeof(cmh))) {
3570                         /* There is not enough room for one more. */
3571                         *error = EINVAL;
3572                         return (1);
3573                 }
3574                 m_copydata(control, off, sizeof(cmh), (caddr_t)&cmh);
3575                 if (cmh.cmsg_len < CMSG_ALIGN(sizeof(cmh))) {
3576                         /* We dont't have a complete CMSG header. */
3577                         *error = EINVAL;
3578                         return (1);
3579                 }
3580                 if ((cmh.cmsg_len > INT_MAX) || ((int)cmh.cmsg_len > rem_len)) {
3581                         /* We don't have the complete CMSG. */
3582                         *error = EINVAL;
3583                         return (1);
3584                 }
3585                 cmsg_data_len = (int)cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh));
3586                 cmsg_data_off = off + CMSG_ALIGN(sizeof(cmh));
3587                 if (cmh.cmsg_level == IPPROTO_SCTP) {
3588                         switch (cmh.cmsg_type) {
3589                         case SCTP_INIT:
3590                                 if (cmsg_data_len < (int)sizeof(struct sctp_initmsg)) {
3591                                         *error = EINVAL;
3592                                         return (1);
3593                                 }
3594                                 m_copydata(control, cmsg_data_off, sizeof(struct sctp_initmsg), (caddr_t)&initmsg);
3595                                 if (initmsg.sinit_max_attempts)
3596                                         stcb->asoc.max_init_times = initmsg.sinit_max_attempts;
3597                                 if (initmsg.sinit_num_ostreams)
3598                                         stcb->asoc.pre_open_streams = initmsg.sinit_num_ostreams;
3599                                 if (initmsg.sinit_max_instreams)
3600                                         stcb->asoc.max_inbound_streams = initmsg.sinit_max_instreams;
3601                                 if (initmsg.sinit_max_init_timeo)
3602                                         stcb->asoc.initial_init_rto_max = initmsg.sinit_max_init_timeo;
3603                                 if (stcb->asoc.streamoutcnt < stcb->asoc.pre_open_streams) {
3604                                         struct sctp_stream_out *tmp_str;
3605                                         unsigned int i;
3606 #if defined(SCTP_DETAILED_STR_STATS)
3607                                         int j;
3608 #endif
3609
3610                                         /* Default is NOT correct */
3611                                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Ok, default:%d pre_open:%d\n",
3612                                             stcb->asoc.streamoutcnt, stcb->asoc.pre_open_streams);
3613                                         SCTP_TCB_UNLOCK(stcb);
3614                                         SCTP_MALLOC(tmp_str,
3615                                             struct sctp_stream_out *,
3616                                             (stcb->asoc.pre_open_streams * sizeof(struct sctp_stream_out)),
3617                                             SCTP_M_STRMO);
3618                                         SCTP_TCB_LOCK(stcb);
3619                                         if (tmp_str != NULL) {
3620                                                 SCTP_FREE(stcb->asoc.strmout, SCTP_M_STRMO);
3621                                                 stcb->asoc.strmout = tmp_str;
3622                                                 stcb->asoc.strm_realoutsize = stcb->asoc.streamoutcnt = stcb->asoc.pre_open_streams;
3623                                         } else {
3624                                                 stcb->asoc.pre_open_streams = stcb->asoc.streamoutcnt;
3625                                         }
3626                                         for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
3627                                                 TAILQ_INIT(&stcb->asoc.strmout[i].outqueue);
3628                                                 stcb->asoc.ss_functions.sctp_ss_init_stream(stcb, &stcb->asoc.strmout[i], NULL);
3629                                                 stcb->asoc.strmout[i].chunks_on_queues = 0;
3630 #if defined(SCTP_DETAILED_STR_STATS)
3631                                                 for (j = 0; j < SCTP_PR_SCTP_MAX + 1; j++) {
3632                                                         stcb->asoc.strmout[i].abandoned_sent[j] = 0;
3633                                                         stcb->asoc.strmout[i].abandoned_unsent[j] = 0;
3634                                                 }
3635 #else
3636                                                 stcb->asoc.strmout[i].abandoned_sent[0] = 0;
3637                                                 stcb->asoc.strmout[i].abandoned_unsent[0] = 0;
3638 #endif
3639                                                 stcb->asoc.strmout[i].next_mid_ordered = 0;
3640                                                 stcb->asoc.strmout[i].next_mid_unordered = 0;
3641                                                 stcb->asoc.strmout[i].sid = i;
3642                                                 stcb->asoc.strmout[i].last_msg_incomplete = 0;
3643                                                 stcb->asoc.strmout[i].state = SCTP_STREAM_OPENING;
3644                                         }
3645                                 }
3646                                 break;
3647 #ifdef INET
3648                         case SCTP_DSTADDRV4:
3649                                 if (cmsg_data_len < (int)sizeof(struct in_addr)) {
3650                                         *error = EINVAL;
3651                                         return (1);
3652                                 }
3653                                 memset(&sin, 0, sizeof(struct sockaddr_in));
3654                                 sin.sin_family = AF_INET;
3655                                 sin.sin_len = sizeof(struct sockaddr_in);
3656                                 sin.sin_port = stcb->rport;
3657                                 m_copydata(control, cmsg_data_off, sizeof(struct in_addr), (caddr_t)&sin.sin_addr);
3658                                 if ((sin.sin_addr.s_addr == INADDR_ANY) ||
3659                                     (sin.sin_addr.s_addr == INADDR_BROADCAST) ||
3660                                     IN_MULTICAST(ntohl(sin.sin_addr.s_addr))) {
3661                                         *error = EINVAL;
3662                                         return (1);
3663                                 }
3664                                 if (sctp_add_remote_addr(stcb, (struct sockaddr *)&sin, NULL, stcb->asoc.port,
3665                                     SCTP_DONOT_SETSCOPE, SCTP_ADDR_IS_CONFIRMED)) {
3666                                         *error = ENOBUFS;
3667                                         return (1);
3668                                 }
3669                                 break;
3670 #endif
3671 #ifdef INET6
3672                         case SCTP_DSTADDRV6:
3673                                 if (cmsg_data_len < (int)sizeof(struct in6_addr)) {
3674                                         *error = EINVAL;
3675                                         return (1);
3676                                 }
3677                                 memset(&sin6, 0, sizeof(struct sockaddr_in6));
3678                                 sin6.sin6_family = AF_INET6;
3679                                 sin6.sin6_len = sizeof(struct sockaddr_in6);
3680                                 sin6.sin6_port = stcb->rport;
3681                                 m_copydata(control, cmsg_data_off, sizeof(struct in6_addr), (caddr_t)&sin6.sin6_addr);
3682                                 if (IN6_IS_ADDR_UNSPECIFIED(&sin6.sin6_addr) ||
3683                                     IN6_IS_ADDR_MULTICAST(&sin6.sin6_addr)) {
3684                                         *error = EINVAL;
3685                                         return (1);
3686                                 }
3687 #ifdef INET
3688                                 if (IN6_IS_ADDR_V4MAPPED(&sin6.sin6_addr)) {
3689                                         in6_sin6_2_sin(&sin, &sin6);
3690                                         if ((sin.sin_addr.s_addr == INADDR_ANY) ||
3691                                             (sin.sin_addr.s_addr == INADDR_BROADCAST) ||
3692                                             IN_MULTICAST(ntohl(sin.sin_addr.s_addr))) {
3693                                                 *error = EINVAL;
3694                                                 return (1);
3695                                         }
3696                                         if (sctp_add_remote_addr(stcb, (struct sockaddr *)&sin, NULL, stcb->asoc.port,
3697                                             SCTP_DONOT_SETSCOPE, SCTP_ADDR_IS_CONFIRMED)) {
3698                                                 *error = ENOBUFS;
3699                                                 return (1);
3700                                         }
3701                                 } else
3702 #endif
3703                                         if (sctp_add_remote_addr(stcb, (struct sockaddr *)&sin6, NULL, stcb->asoc.port,
3704                                     SCTP_DONOT_SETSCOPE, SCTP_ADDR_IS_CONFIRMED)) {
3705                                         *error = ENOBUFS;
3706                                         return (1);
3707                                 }
3708                                 break;
3709 #endif
3710                         default:
3711                                 break;
3712                         }
3713                 }
3714         }
3715         return (0);
3716 }
3717
3718 #if defined(INET) || defined(INET6)
3719 static struct sctp_tcb *
3720 sctp_findassociation_cmsgs(struct sctp_inpcb **inp_p,
3721     uint16_t port,
3722     struct mbuf *control,
3723     struct sctp_nets **net_p,
3724     int *error)
3725 {
3726         struct cmsghdr cmh;
3727         struct sctp_tcb *stcb;
3728         struct sockaddr *addr;
3729 #ifdef INET
3730         struct sockaddr_in sin;
3731 #endif
3732 #ifdef INET6
3733         struct sockaddr_in6 sin6;
3734 #endif
3735         int tot_len, rem_len, cmsg_data_len, cmsg_data_off, off;
3736
3737         tot_len = SCTP_BUF_LEN(control);
3738         for (off = 0; off < tot_len; off += CMSG_ALIGN(cmh.cmsg_len)) {
3739                 rem_len = tot_len - off;
3740                 if (rem_len < (int)CMSG_ALIGN(sizeof(cmh))) {
3741                         /* There is not enough room for one more. */
3742                         *error = EINVAL;
3743                         return (NULL);
3744                 }
3745                 m_copydata(control, off, sizeof(cmh), (caddr_t)&cmh);
3746                 if (cmh.cmsg_len < CMSG_ALIGN(sizeof(cmh))) {
3747                         /* We dont't have a complete CMSG header. */
3748                         *error = EINVAL;
3749                         return (NULL);
3750                 }
3751                 if ((cmh.cmsg_len > INT_MAX) || ((int)cmh.cmsg_len > rem_len)) {
3752                         /* We don't have the complete CMSG. */
3753                         *error = EINVAL;
3754                         return (NULL);
3755                 }
3756                 cmsg_data_len = (int)cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh));
3757                 cmsg_data_off = off + CMSG_ALIGN(sizeof(cmh));
3758                 if (cmh.cmsg_level == IPPROTO_SCTP) {
3759                         switch (cmh.cmsg_type) {
3760 #ifdef INET
3761                         case SCTP_DSTADDRV4:
3762                                 if (cmsg_data_len < (int)sizeof(struct in_addr)) {
3763                                         *error = EINVAL;
3764                                         return (NULL);
3765                                 }
3766                                 memset(&sin, 0, sizeof(struct sockaddr_in));
3767                                 sin.sin_family = AF_INET;
3768                                 sin.sin_len = sizeof(struct sockaddr_in);
3769                                 sin.sin_port = port;
3770                                 m_copydata(control, cmsg_data_off, sizeof(struct in_addr), (caddr_t)&sin.sin_addr);
3771                                 addr = (struct sockaddr *)&sin;
3772                                 break;
3773 #endif
3774 #ifdef INET6
3775                         case SCTP_DSTADDRV6:
3776                                 if (cmsg_data_len < (int)sizeof(struct in6_addr)) {
3777                                         *error = EINVAL;
3778                                         return (NULL);
3779                                 }
3780                                 memset(&sin6, 0, sizeof(struct sockaddr_in6));
3781                                 sin6.sin6_family = AF_INET6;
3782                                 sin6.sin6_len = sizeof(struct sockaddr_in6);
3783                                 sin6.sin6_port = port;
3784                                 m_copydata(control, cmsg_data_off, sizeof(struct in6_addr), (caddr_t)&sin6.sin6_addr);
3785 #ifdef INET
3786                                 if (IN6_IS_ADDR_V4MAPPED(&sin6.sin6_addr)) {
3787                                         in6_sin6_2_sin(&sin, &sin6);
3788                                         addr = (struct sockaddr *)&sin;
3789                                 } else
3790 #endif
3791                                         addr = (struct sockaddr *)&sin6;
3792                                 break;
3793 #endif
3794                         default:
3795                                 addr = NULL;
3796                                 break;
3797                         }
3798                         if (addr) {
3799                                 stcb = sctp_findassociation_ep_addr(inp_p, addr, net_p, NULL, NULL);
3800                                 if (stcb != NULL) {
3801                                         return (stcb);
3802                                 }
3803                         }
3804                 }
3805         }
3806         return (NULL);
3807 }
3808 #endif
3809
3810 static struct mbuf *
3811 sctp_add_cookie(struct mbuf *init, int init_offset,
3812     struct mbuf *initack, int initack_offset, struct sctp_state_cookie *stc_in, uint8_t **signature)
3813 {
3814         struct mbuf *copy_init, *copy_initack, *m_at, *sig, *mret;
3815         struct sctp_state_cookie *stc;
3816         struct sctp_paramhdr *ph;
3817         uint16_t cookie_sz;
3818
3819         mret = sctp_get_mbuf_for_msg((sizeof(struct sctp_state_cookie) +
3820             sizeof(struct sctp_paramhdr)), 0,
3821             M_NOWAIT, 1, MT_DATA);
3822         if (mret == NULL) {
3823                 return (NULL);
3824         }
3825         copy_init = SCTP_M_COPYM(init, init_offset, M_COPYALL, M_NOWAIT);
3826         if (copy_init == NULL) {
3827                 sctp_m_freem(mret);
3828                 return (NULL);
3829         }
3830 #ifdef SCTP_MBUF_LOGGING
3831         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
3832                 sctp_log_mbc(copy_init, SCTP_MBUF_ICOPY);
3833         }
3834 #endif
3835         copy_initack = SCTP_M_COPYM(initack, initack_offset, M_COPYALL,
3836             M_NOWAIT);
3837         if (copy_initack == NULL) {
3838                 sctp_m_freem(mret);
3839                 sctp_m_freem(copy_init);
3840                 return (NULL);
3841         }
3842 #ifdef SCTP_MBUF_LOGGING
3843         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
3844                 sctp_log_mbc(copy_initack, SCTP_MBUF_ICOPY);
3845         }
3846 #endif
3847         /* easy side we just drop it on the end */
3848         ph = mtod(mret, struct sctp_paramhdr *);
3849         SCTP_BUF_LEN(mret) = sizeof(struct sctp_state_cookie) +
3850             sizeof(struct sctp_paramhdr);
3851         stc = (struct sctp_state_cookie *)((caddr_t)ph +
3852             sizeof(struct sctp_paramhdr));
3853         ph->param_type = htons(SCTP_STATE_COOKIE);
3854         ph->param_length = 0;   /* fill in at the end */
3855         /* Fill in the stc cookie data */
3856         memcpy(stc, stc_in, sizeof(struct sctp_state_cookie));
3857
3858         /* tack the INIT and then the INIT-ACK onto the chain */
3859         cookie_sz = 0;
3860         for (m_at = mret; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
3861                 cookie_sz += SCTP_BUF_LEN(m_at);
3862                 if (SCTP_BUF_NEXT(m_at) == NULL) {
3863                         SCTP_BUF_NEXT(m_at) = copy_init;
3864                         break;
3865                 }
3866         }
3867         for (m_at = copy_init; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
3868                 cookie_sz += SCTP_BUF_LEN(m_at);
3869                 if (SCTP_BUF_NEXT(m_at) == NULL) {
3870                         SCTP_BUF_NEXT(m_at) = copy_initack;
3871                         break;
3872                 }
3873         }
3874         for (m_at = copy_initack; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
3875                 cookie_sz += SCTP_BUF_LEN(m_at);
3876                 if (SCTP_BUF_NEXT(m_at) == NULL) {
3877                         break;
3878                 }
3879         }
3880         sig = sctp_get_mbuf_for_msg(SCTP_SIGNATURE_SIZE, 0, M_NOWAIT, 1, MT_DATA);
3881         if (sig == NULL) {
3882                 /* no space, so free the entire chain */
3883                 sctp_m_freem(mret);
3884                 return (NULL);
3885         }
3886         SCTP_BUF_NEXT(m_at) = sig;
3887         SCTP_BUF_LEN(sig) = SCTP_SIGNATURE_SIZE;
3888         cookie_sz += SCTP_SIGNATURE_SIZE;
3889         ph->param_length = htons(cookie_sz);
3890         *signature = (uint8_t *)mtod(sig, caddr_t);
3891         memset(*signature, 0, SCTP_SIGNATURE_SIZE);
3892         return (mret);
3893 }
3894
3895 static uint8_t
3896 sctp_get_ect(struct sctp_tcb *stcb)
3897 {
3898         if ((stcb != NULL) && (stcb->asoc.ecn_supported == 1)) {
3899                 return (SCTP_ECT0_BIT);
3900         } else {
3901                 return (0);
3902         }
3903 }
3904
3905 #if defined(INET) || defined(INET6)
3906 static void
3907 sctp_handle_no_route(struct sctp_tcb *stcb,
3908     struct sctp_nets *net,
3909     int so_locked)
3910 {
3911         SCTPDBG(SCTP_DEBUG_OUTPUT1, "dropped packet - no valid source addr\n");
3912
3913         if (net) {
3914                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Destination was ");
3915                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT1, &net->ro._l_addr.sa);
3916                 if (net->dest_state & SCTP_ADDR_CONFIRMED) {
3917                         if ((net->dest_state & SCTP_ADDR_REACHABLE) && stcb) {
3918                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "no route takes interface %p down\n", (void *)net);
3919                                 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_DOWN,
3920                                     stcb, 0,
3921                                     (void *)net,
3922                                     so_locked);
3923                                 net->dest_state &= ~SCTP_ADDR_REACHABLE;
3924                                 net->dest_state &= ~SCTP_ADDR_PF;
3925                         }
3926                 }
3927                 if (stcb) {
3928                         if (net == stcb->asoc.primary_destination) {
3929                                 /* need a new primary */
3930                                 struct sctp_nets *alt;
3931
3932                                 alt = sctp_find_alternate_net(stcb, net, 0);
3933                                 if (alt != net) {
3934                                         if (stcb->asoc.alternate) {
3935                                                 sctp_free_remote_addr(stcb->asoc.alternate);
3936                                         }
3937                                         stcb->asoc.alternate = alt;
3938                                         atomic_add_int(&stcb->asoc.alternate->ref_count, 1);
3939                                         if (net->ro._s_addr) {
3940                                                 sctp_free_ifa(net->ro._s_addr);
3941                                                 net->ro._s_addr = NULL;
3942                                         }
3943                                         net->src_addr_selected = 0;
3944                                 }
3945                         }
3946                 }
3947         }
3948 }
3949 #endif
3950
3951 static int
3952 sctp_lowlevel_chunk_output(struct sctp_inpcb *inp,
3953     struct sctp_tcb *stcb,      /* may be NULL */
3954     struct sctp_nets *net,
3955     struct sockaddr *to,
3956     struct mbuf *m,
3957     uint32_t auth_offset,
3958     struct sctp_auth_chunk *auth,
3959     uint16_t auth_keyid,
3960     int nofragment_flag,
3961     int ecn_ok,
3962     int out_of_asoc_ok,
3963     uint16_t src_port,
3964     uint16_t dest_port,
3965     uint32_t v_tag,
3966     uint16_t port,
3967     union sctp_sockstore *over_addr,
3968     uint8_t mflowtype, uint32_t mflowid,
3969     bool use_zero_crc,
3970     int so_locked)
3971 {
3972 /* nofragment_flag to tell if IP_DF should be set (IPv4 only) */
3973         /**
3974          * Given a mbuf chain (via SCTP_BUF_NEXT()) that holds a packet header
3975          * WITH an SCTPHDR but no IP header, endpoint inp and sa structure:
3976          * - fill in the HMAC digest of any AUTH chunk in the packet.
3977          * - calculate and fill in the SCTP checksum.
3978          * - prepend an IP address header.
3979          * - if boundall use INADDR_ANY.
3980          * - if boundspecific do source address selection.
3981          * - set fragmentation option for ipV4.
3982          * - On return from IP output, check/adjust mtu size of output
3983          *   interface and smallest_mtu size as well.
3984          */
3985         /* Will need ifdefs around this */
3986         struct mbuf *newm;
3987         struct sctphdr *sctphdr;
3988         int packet_length;
3989         int ret;
3990 #if defined(INET) || defined(INET6)
3991         uint32_t vrf_id;
3992 #endif
3993 #if defined(INET) || defined(INET6)
3994         struct mbuf *o_pak;
3995         sctp_route_t *ro = NULL;
3996         struct udphdr *udp = NULL;
3997 #endif
3998         uint8_t tos_value;
3999
4000         if ((net) && (net->dest_state & SCTP_ADDR_OUT_OF_SCOPE)) {
4001                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EFAULT);
4002                 sctp_m_freem(m);
4003                 return (EFAULT);
4004         }
4005 #if defined(INET) || defined(INET6)
4006         if (stcb) {
4007                 vrf_id = stcb->asoc.vrf_id;
4008         } else {
4009                 vrf_id = inp->def_vrf_id;
4010         }
4011 #endif
4012         /* fill in the HMAC digest for any AUTH chunk in the packet */
4013         if ((auth != NULL) && (stcb != NULL)) {
4014                 sctp_fill_hmac_digest_m(m, auth_offset, auth, stcb, auth_keyid);
4015         }
4016
4017         if (net) {
4018                 tos_value = net->dscp;
4019         } else if (stcb) {
4020                 tos_value = stcb->asoc.default_dscp;
4021         } else {
4022                 tos_value = inp->sctp_ep.default_dscp;
4023         }
4024
4025         switch (to->sa_family) {
4026 #ifdef INET
4027         case AF_INET:
4028                 {
4029                         struct ip *ip = NULL;
4030                         sctp_route_t iproute;
4031                         int len;
4032
4033                         len = SCTP_MIN_V4_OVERHEAD;
4034                         if (port) {
4035                                 len += sizeof(struct udphdr);
4036                         }
4037                         newm = sctp_get_mbuf_for_msg(len, 1, M_NOWAIT, 1, MT_DATA);
4038                         if (newm == NULL) {
4039                                 sctp_m_freem(m);
4040                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
4041                                 return (ENOMEM);
4042                         }
4043                         SCTP_ALIGN_TO_END(newm, len);
4044                         SCTP_BUF_LEN(newm) = len;
4045                         SCTP_BUF_NEXT(newm) = m;
4046                         m = newm;
4047                         if (net != NULL) {
4048                                 m->m_pkthdr.flowid = net->flowid;
4049                                 M_HASHTYPE_SET(m, net->flowtype);
4050                         } else {
4051                                 m->m_pkthdr.flowid = mflowid;
4052                                 M_HASHTYPE_SET(m, mflowtype);
4053                         }
4054                         packet_length = sctp_calculate_len(m);
4055                         ip = mtod(m, struct ip *);
4056                         ip->ip_v = IPVERSION;
4057                         ip->ip_hl = (sizeof(struct ip) >> 2);
4058                         if (tos_value == 0) {
4059                                 /*
4060                                  * This means especially, that it is not set
4061                                  * at the SCTP layer. So use the value from
4062                                  * the IP layer.
4063                                  */
4064                                 tos_value = inp->ip_inp.inp.inp_ip_tos;
4065                         }
4066                         tos_value &= 0xfc;
4067                         if (ecn_ok) {
4068                                 tos_value |= sctp_get_ect(stcb);
4069                         }
4070                         if ((nofragment_flag) && (port == 0)) {
4071                                 ip->ip_off = htons(IP_DF);
4072                         } else {
4073                                 ip->ip_off = htons(0);
4074                         }
4075                         /* FreeBSD has a function for ip_id's */
4076                         ip_fillid(ip);
4077
4078                         ip->ip_ttl = inp->ip_inp.inp.inp_ip_ttl;
4079                         ip->ip_len = htons(packet_length);
4080                         ip->ip_tos = tos_value;
4081                         if (port) {
4082                                 ip->ip_p = IPPROTO_UDP;
4083                         } else {
4084                                 ip->ip_p = IPPROTO_SCTP;
4085                         }
4086                         ip->ip_sum = 0;
4087                         if (net == NULL) {
4088                                 ro = &iproute;
4089                                 memset(&iproute, 0, sizeof(iproute));
4090                                 memcpy(&ro->ro_dst, to, to->sa_len);
4091                         } else {
4092                                 ro = (sctp_route_t *)&net->ro;
4093                         }
4094                         /* Now the address selection part */
4095                         ip->ip_dst.s_addr = ((struct sockaddr_in *)to)->sin_addr.s_addr;
4096
4097                         /* call the routine to select the src address */
4098                         if (net && out_of_asoc_ok == 0) {
4099                                 if (net->ro._s_addr && (net->ro._s_addr->localifa_flags & (SCTP_BEING_DELETED | SCTP_ADDR_IFA_UNUSEABLE))) {
4100                                         sctp_free_ifa(net->ro._s_addr);
4101                                         net->ro._s_addr = NULL;
4102                                         net->src_addr_selected = 0;
4103                                         RO_NHFREE(ro);
4104                                 }
4105                                 if (net->src_addr_selected == 0) {
4106                                         /* Cache the source address */
4107                                         net->ro._s_addr = sctp_source_address_selection(inp, stcb,
4108                                             ro, net, 0,
4109                                             vrf_id);
4110                                         net->src_addr_selected = 1;
4111                                 }
4112                                 if (net->ro._s_addr == NULL) {
4113                                         /* No route to host */
4114                                         net->src_addr_selected = 0;
4115                                         sctp_handle_no_route(stcb, net, so_locked);
4116                                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4117                                         sctp_m_freem(m);
4118                                         return (EHOSTUNREACH);
4119                                 }
4120                                 ip->ip_src = net->ro._s_addr->address.sin.sin_addr;
4121                         } else {
4122                                 if (over_addr == NULL) {
4123                                         struct sctp_ifa *_lsrc;
4124
4125                                         _lsrc = sctp_source_address_selection(inp, stcb, ro,
4126                                             net,
4127                                             out_of_asoc_ok,
4128                                             vrf_id);
4129                                         if (_lsrc == NULL) {
4130                                                 sctp_handle_no_route(stcb, net, so_locked);
4131                                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4132                                                 sctp_m_freem(m);
4133                                                 return (EHOSTUNREACH);
4134                                         }
4135                                         ip->ip_src = _lsrc->address.sin.sin_addr;
4136                                         sctp_free_ifa(_lsrc);
4137                                 } else {
4138                                         ip->ip_src = over_addr->sin.sin_addr;
4139                                         SCTP_RTALLOC(ro, vrf_id, inp->fibnum);
4140                                 }
4141                         }
4142                         if (port) {
4143                                 if (htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port)) == 0) {
4144                                         sctp_handle_no_route(stcb, net, so_locked);
4145                                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4146                                         sctp_m_freem(m);
4147                                         return (EHOSTUNREACH);
4148                                 }
4149                                 udp = (struct udphdr *)((caddr_t)ip + sizeof(struct ip));
4150                                 udp->uh_sport = htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port));
4151                                 udp->uh_dport = port;
4152                                 udp->uh_ulen = htons((uint16_t)(packet_length - sizeof(struct ip)));
4153                                 if (V_udp_cksum) {
4154                                         udp->uh_sum = in_pseudo(ip->ip_src.s_addr, ip->ip_dst.s_addr, udp->uh_ulen + htons(IPPROTO_UDP));
4155                                 } else {
4156                                         udp->uh_sum = 0;
4157                                 }
4158                                 sctphdr = (struct sctphdr *)((caddr_t)udp + sizeof(struct udphdr));
4159                         } else {
4160                                 sctphdr = (struct sctphdr *)((caddr_t)ip + sizeof(struct ip));
4161                         }
4162
4163                         sctphdr->src_port = src_port;
4164                         sctphdr->dest_port = dest_port;
4165                         sctphdr->v_tag = v_tag;
4166                         sctphdr->checksum = 0;
4167
4168                         /*
4169                          * If source address selection fails and we find no
4170                          * route then the ip_output should fail as well with
4171                          * a NO_ROUTE_TO_HOST type error. We probably should
4172                          * catch that somewhere and abort the association
4173                          * right away (assuming this is an INIT being sent).
4174                          */
4175                         if (ro->ro_nh == NULL) {
4176                                 /*
4177                                  * src addr selection failed to find a route
4178                                  * (or valid source addr), so we can't get
4179                                  * there from here (yet)!
4180                                  */
4181                                 sctp_handle_no_route(stcb, net, so_locked);
4182                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4183                                 sctp_m_freem(m);
4184                                 return (EHOSTUNREACH);
4185                         }
4186                         if (ro != &iproute) {
4187                                 memcpy(&iproute, ro, sizeof(*ro));
4188                         }
4189                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "Calling ipv4 output routine from low level src addr:%x\n",
4190                             (uint32_t)(ntohl(ip->ip_src.s_addr)));
4191                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "Destination is %x\n",
4192                             (uint32_t)(ntohl(ip->ip_dst.s_addr)));
4193                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "RTP route is %p through\n",
4194                             (void *)ro->ro_nh);
4195
4196                         if (SCTP_GET_HEADER_FOR_OUTPUT(o_pak)) {
4197                                 /* failed to prepend data, give up */
4198                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
4199                                 sctp_m_freem(m);
4200                                 return (ENOMEM);
4201                         }
4202                         SCTP_ATTACH_CHAIN(o_pak, m, packet_length);
4203                         if (port) {
4204                                 if (use_zero_crc) {
4205                                         SCTP_STAT_INCR(sctps_sendzerocrc);
4206                                 } else {
4207                                         sctphdr->checksum = sctp_calculate_cksum(m, sizeof(struct ip) + sizeof(struct udphdr));
4208                                         SCTP_STAT_INCR(sctps_sendswcrc);
4209                                 }
4210                                 if (V_udp_cksum) {
4211                                         SCTP_ENABLE_UDP_CSUM(o_pak);
4212                                 }
4213                         } else {
4214                                 if (use_zero_crc) {
4215                                         SCTP_STAT_INCR(sctps_sendzerocrc);
4216                                 } else {
4217                                         m->m_pkthdr.csum_flags = CSUM_SCTP;
4218                                         m->m_pkthdr.csum_data = offsetof(struct sctphdr, checksum);
4219                                         SCTP_STAT_INCR(sctps_sendhwcrc);
4220                                 }
4221                         }
4222 #ifdef SCTP_PACKET_LOGGING
4223                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING)
4224                                 sctp_packet_log(o_pak);
4225 #endif
4226                         /* send it out.  table id is taken from stcb */
4227                         SCTP_PROBE5(send, NULL, stcb, ip, stcb, sctphdr);
4228                         SCTP_IP_OUTPUT(ret, o_pak, ro, inp, vrf_id);
4229                         if (port) {
4230                                 UDPSTAT_INC(udps_opackets);
4231                         }
4232                         SCTP_STAT_INCR(sctps_sendpackets);
4233                         SCTP_STAT_INCR_COUNTER64(sctps_outpackets);
4234                         if (ret)
4235                                 SCTP_STAT_INCR(sctps_senderrors);
4236
4237                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "IP output returns %d\n", ret);
4238                         if (net == NULL) {
4239                                 /* free tempy routes */
4240                                 RO_NHFREE(ro);
4241                         } else {
4242                                 if ((ro->ro_nh != NULL) && (net->ro._s_addr) &&
4243                                     ((net->dest_state & SCTP_ADDR_NO_PMTUD) == 0)) {
4244                                         uint32_t mtu;
4245
4246                                         mtu = SCTP_GATHER_MTU_FROM_ROUTE(net->ro._s_addr, &net->ro._l_addr.sa, ro->ro_nh);
4247                                         if (mtu > 0) {
4248                                                 if (net->port) {
4249                                                         mtu -= sizeof(struct udphdr);
4250                                                 }
4251                                                 if (mtu < net->mtu) {
4252                                                         net->mtu = mtu;
4253                                                         if ((stcb != NULL) && (stcb->asoc.smallest_mtu > mtu)) {
4254                                                                 sctp_pathmtu_adjustment(stcb, mtu, true);
4255                                                         }
4256                                                 }
4257                                         }
4258                                 } else if (ro->ro_nh == NULL) {
4259                                         /* route was freed */
4260                                         if (net->ro._s_addr &&
4261                                             net->src_addr_selected) {
4262                                                 sctp_free_ifa(net->ro._s_addr);
4263                                                 net->ro._s_addr = NULL;
4264                                         }
4265                                         net->src_addr_selected = 0;
4266                                 }
4267                         }
4268                         return (ret);
4269                 }
4270 #endif
4271 #ifdef INET6
4272         case AF_INET6:
4273                 {
4274                         uint32_t flowlabel, flowinfo;
4275                         struct ip6_hdr *ip6h;
4276                         struct route_in6 ip6route;
4277                         struct ifnet *ifp;
4278                         struct sockaddr_in6 *sin6, tmp, *lsa6, lsa6_tmp;
4279                         int prev_scope = 0;
4280                         struct sockaddr_in6 lsa6_storage;
4281                         int error;
4282                         u_short prev_port = 0;
4283                         int len;
4284
4285                         if (net) {
4286                                 flowlabel = net->flowlabel;
4287                         } else if (stcb) {
4288                                 flowlabel = stcb->asoc.default_flowlabel;
4289                         } else {
4290                                 flowlabel = inp->sctp_ep.default_flowlabel;
4291                         }
4292                         if (flowlabel == 0) {
4293                                 /*
4294                                  * This means especially, that it is not set
4295                                  * at the SCTP layer. So use the value from
4296                                  * the IP layer.
4297                                  */
4298                                 flowlabel = ntohl(((struct inpcb *)inp)->inp_flow);
4299                         }
4300                         flowlabel &= 0x000fffff;
4301                         len = SCTP_MIN_OVERHEAD;
4302                         if (port) {
4303                                 len += sizeof(struct udphdr);
4304                         }
4305                         newm = sctp_get_mbuf_for_msg(len, 1, M_NOWAIT, 1, MT_DATA);
4306                         if (newm == NULL) {
4307                                 sctp_m_freem(m);
4308                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
4309                                 return (ENOMEM);
4310                         }
4311                         SCTP_ALIGN_TO_END(newm, len);
4312                         SCTP_BUF_LEN(newm) = len;
4313                         SCTP_BUF_NEXT(newm) = m;
4314                         m = newm;
4315                         if (net != NULL) {
4316                                 m->m_pkthdr.flowid = net->flowid;
4317                                 M_HASHTYPE_SET(m, net->flowtype);
4318                         } else {
4319                                 m->m_pkthdr.flowid = mflowid;
4320                                 M_HASHTYPE_SET(m, mflowtype);
4321                         }
4322                         packet_length = sctp_calculate_len(m);
4323
4324                         ip6h = mtod(m, struct ip6_hdr *);
4325                         /* protect *sin6 from overwrite */
4326                         sin6 = (struct sockaddr_in6 *)to;
4327                         tmp = *sin6;
4328                         sin6 = &tmp;
4329
4330                         /* KAME hack: embed scopeid */
4331                         if (sa6_embedscope(sin6, MODULE_GLOBAL(ip6_use_defzone)) != 0) {
4332                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
4333                                 sctp_m_freem(m);
4334                                 return (EINVAL);
4335                         }
4336                         if (net == NULL) {
4337                                 memset(&ip6route, 0, sizeof(ip6route));
4338                                 ro = (sctp_route_t *)&ip6route;
4339                                 memcpy(&ro->ro_dst, sin6, sin6->sin6_len);
4340                         } else {
4341                                 ro = (sctp_route_t *)&net->ro;
4342                         }
4343                         /*
4344                          * We assume here that inp_flow is in host byte
4345                          * order within the TCB!
4346                          */
4347                         if (tos_value == 0) {
4348                                 /*
4349                                  * This means especially, that it is not set
4350                                  * at the SCTP layer. So use the value from
4351                                  * the IP layer.
4352                                  */
4353                                 tos_value = (ntohl(((struct inpcb *)inp)->inp_flow) >> 20) & 0xff;
4354                         }
4355                         tos_value &= 0xfc;
4356                         if (ecn_ok) {
4357                                 tos_value |= sctp_get_ect(stcb);
4358                         }
4359                         flowinfo = 0x06;
4360                         flowinfo <<= 8;
4361                         flowinfo |= tos_value;
4362                         flowinfo <<= 20;
4363                         flowinfo |= flowlabel;
4364                         ip6h->ip6_flow = htonl(flowinfo);
4365                         if (port) {
4366                                 ip6h->ip6_nxt = IPPROTO_UDP;
4367                         } else {
4368                                 ip6h->ip6_nxt = IPPROTO_SCTP;
4369                         }
4370                         ip6h->ip6_plen = htons((uint16_t)(packet_length - sizeof(struct ip6_hdr)));
4371                         ip6h->ip6_dst = sin6->sin6_addr;
4372
4373                         /*
4374                          * Add SRC address selection here: we can only reuse
4375                          * to a limited degree the kame src-addr-sel, since
4376                          * we can try their selection but it may not be
4377                          * bound.
4378                          */
4379                         memset(&lsa6_tmp, 0, sizeof(lsa6_tmp));
4380                         lsa6_tmp.sin6_family = AF_INET6;
4381                         lsa6_tmp.sin6_len = sizeof(lsa6_tmp);
4382                         lsa6 = &lsa6_tmp;
4383                         if (net && out_of_asoc_ok == 0) {
4384                                 if (net->ro._s_addr && (net->ro._s_addr->localifa_flags & (SCTP_BEING_DELETED | SCTP_ADDR_IFA_UNUSEABLE))) {
4385                                         sctp_free_ifa(net->ro._s_addr);
4386                                         net->ro._s_addr = NULL;
4387                                         net->src_addr_selected = 0;
4388                                         RO_NHFREE(ro);
4389                                 }
4390                                 if (net->src_addr_selected == 0) {
4391                                         sin6 = (struct sockaddr_in6 *)&net->ro._l_addr;
4392                                         /* KAME hack: embed scopeid */
4393                                         if (sa6_embedscope(sin6, MODULE_GLOBAL(ip6_use_defzone)) != 0) {
4394                                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
4395                                                 sctp_m_freem(m);
4396                                                 return (EINVAL);
4397                                         }
4398                                         /* Cache the source address */
4399                                         net->ro._s_addr = sctp_source_address_selection(inp,
4400                                             stcb,
4401                                             ro,
4402                                             net,
4403                                             0,
4404                                             vrf_id);
4405                                         (void)sa6_recoverscope(sin6);
4406                                         net->src_addr_selected = 1;
4407                                 }
4408                                 if (net->ro._s_addr == NULL) {
4409                                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "V6:No route to host\n");
4410                                         net->src_addr_selected = 0;
4411                                         sctp_handle_no_route(stcb, net, so_locked);
4412                                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4413                                         sctp_m_freem(m);
4414                                         return (EHOSTUNREACH);
4415                                 }
4416                                 lsa6->sin6_addr = net->ro._s_addr->address.sin6.sin6_addr;
4417                         } else {
4418                                 sin6 = (struct sockaddr_in6 *)&ro->ro_dst;
4419                                 /* KAME hack: embed scopeid */
4420                                 if (sa6_embedscope(sin6, MODULE_GLOBAL(ip6_use_defzone)) != 0) {
4421                                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
4422                                         sctp_m_freem(m);
4423                                         return (EINVAL);
4424                                 }
4425                                 if (over_addr == NULL) {
4426                                         struct sctp_ifa *_lsrc;
4427
4428                                         _lsrc = sctp_source_address_selection(inp, stcb, ro,
4429                                             net,
4430                                             out_of_asoc_ok,
4431                                             vrf_id);
4432                                         if (_lsrc == NULL) {
4433                                                 sctp_handle_no_route(stcb, net, so_locked);
4434                                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4435                                                 sctp_m_freem(m);
4436                                                 return (EHOSTUNREACH);
4437                                         }
4438                                         lsa6->sin6_addr = _lsrc->address.sin6.sin6_addr;
4439                                         sctp_free_ifa(_lsrc);
4440                                 } else {
4441                                         lsa6->sin6_addr = over_addr->sin6.sin6_addr;
4442                                         SCTP_RTALLOC(ro, vrf_id, inp->fibnum);
4443                                 }
4444                                 (void)sa6_recoverscope(sin6);
4445                         }
4446                         lsa6->sin6_port = inp->sctp_lport;
4447
4448                         if (ro->ro_nh == NULL) {
4449                                 /*
4450                                  * src addr selection failed to find a route
4451                                  * (or valid source addr), so we can't get
4452                                  * there from here!
4453                                  */
4454                                 sctp_handle_no_route(stcb, net, so_locked);
4455                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4456                                 sctp_m_freem(m);
4457                                 return (EHOSTUNREACH);
4458                         }
4459                         /*
4460                          * XXX: sa6 may not have a valid sin6_scope_id in
4461                          * the non-SCOPEDROUTING case.
4462                          */
4463                         memset(&lsa6_storage, 0, sizeof(lsa6_storage));
4464                         lsa6_storage.sin6_family = AF_INET6;
4465                         lsa6_storage.sin6_len = sizeof(lsa6_storage);
4466                         lsa6_storage.sin6_addr = lsa6->sin6_addr;
4467                         if ((error = sa6_recoverscope(&lsa6_storage)) != 0) {
4468                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "recover scope fails error %d\n", error);
4469                                 sctp_m_freem(m);
4470                                 return (error);
4471                         }
4472                         /* XXX */
4473                         lsa6_storage.sin6_addr = lsa6->sin6_addr;
4474                         lsa6_storage.sin6_port = inp->sctp_lport;
4475                         lsa6 = &lsa6_storage;
4476                         ip6h->ip6_src = lsa6->sin6_addr;
4477
4478                         if (port) {
4479                                 if (htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port)) == 0) {
4480                                         sctp_handle_no_route(stcb, net, so_locked);
4481                                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4482                                         sctp_m_freem(m);
4483                                         return (EHOSTUNREACH);
4484                                 }
4485                                 udp = (struct udphdr *)((caddr_t)ip6h + sizeof(struct ip6_hdr));
4486                                 udp->uh_sport = htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port));
4487                                 udp->uh_dport = port;
4488                                 udp->uh_ulen = htons((uint16_t)(packet_length - sizeof(struct ip6_hdr)));
4489                                 udp->uh_sum = 0;
4490                                 sctphdr = (struct sctphdr *)((caddr_t)udp + sizeof(struct udphdr));
4491                         } else {
4492                                 sctphdr = (struct sctphdr *)((caddr_t)ip6h + sizeof(struct ip6_hdr));
4493                         }
4494
4495                         sctphdr->src_port = src_port;
4496                         sctphdr->dest_port = dest_port;
4497                         sctphdr->v_tag = v_tag;
4498                         sctphdr->checksum = 0;
4499
4500                         /*
4501                          * We set the hop limit now since there is a good
4502                          * chance that our ro pointer is now filled
4503                          */
4504                         ip6h->ip6_hlim = SCTP_GET_HLIM(inp, ro);
4505                         ifp = SCTP_GET_IFN_VOID_FROM_ROUTE(ro);
4506
4507 #ifdef SCTP_DEBUG
4508                         /* Copy to be sure something bad is not happening */
4509                         sin6->sin6_addr = ip6h->ip6_dst;
4510                         lsa6->sin6_addr = ip6h->ip6_src;
4511 #endif
4512
4513                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "Calling ipv6 output routine from low level\n");
4514                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "src: ");
4515                         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT3, (struct sockaddr *)lsa6);
4516                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "dst: ");
4517                         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT3, (struct sockaddr *)sin6);
4518                         if (net) {
4519                                 sin6 = (struct sockaddr_in6 *)&net->ro._l_addr;
4520                                 /*
4521                                  * preserve the port and scope for link
4522                                  * local send
4523                                  */
4524                                 prev_scope = sin6->sin6_scope_id;
4525                                 prev_port = sin6->sin6_port;
4526                         }
4527
4528                         if (SCTP_GET_HEADER_FOR_OUTPUT(o_pak)) {
4529                                 /* failed to prepend data, give up */
4530                                 sctp_m_freem(m);
4531                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
4532                                 return (ENOMEM);
4533                         }
4534                         SCTP_ATTACH_CHAIN(o_pak, m, packet_length);
4535                         if (port) {
4536                                 sctphdr->checksum = sctp_calculate_cksum(m, sizeof(struct ip6_hdr) + sizeof(struct udphdr));
4537                                 SCTP_STAT_INCR(sctps_sendswcrc);
4538                                 if ((udp->uh_sum = in6_cksum(o_pak, IPPROTO_UDP, sizeof(struct ip6_hdr), packet_length - sizeof(struct ip6_hdr))) == 0) {
4539                                         udp->uh_sum = 0xffff;
4540                                 }
4541                         } else {
4542                                 m->m_pkthdr.csum_flags = CSUM_SCTP_IPV6;
4543                                 m->m_pkthdr.csum_data = offsetof(struct sctphdr, checksum);
4544                                 SCTP_STAT_INCR(sctps_sendhwcrc);
4545                         }
4546                         /* send it out. table id is taken from stcb */
4547 #ifdef SCTP_PACKET_LOGGING
4548                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING)
4549                                 sctp_packet_log(o_pak);
4550 #endif
4551                         SCTP_PROBE5(send, NULL, stcb, ip6h, stcb, sctphdr);
4552                         SCTP_IP6_OUTPUT(ret, o_pak, (struct route_in6 *)ro, &ifp, inp, vrf_id);
4553                         if (net) {
4554                                 /* for link local this must be done */
4555                                 sin6->sin6_scope_id = prev_scope;
4556                                 sin6->sin6_port = prev_port;
4557                         }
4558                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "return from send is %d\n", ret);
4559                         if (port) {
4560                                 UDPSTAT_INC(udps_opackets);
4561                         }
4562                         SCTP_STAT_INCR(sctps_sendpackets);
4563                         SCTP_STAT_INCR_COUNTER64(sctps_outpackets);
4564                         if (ret) {
4565                                 SCTP_STAT_INCR(sctps_senderrors);
4566                         }
4567                         if (net == NULL) {
4568                                 /* Now if we had a temp route free it */
4569                                 RO_NHFREE(ro);
4570                         } else {
4571                                 /*
4572                                  * PMTU check versus smallest asoc MTU goes
4573                                  * here
4574                                  */
4575                                 if (ro->ro_nh == NULL) {
4576                                         /* Route was freed */
4577                                         if (net->ro._s_addr &&
4578                                             net->src_addr_selected) {
4579                                                 sctp_free_ifa(net->ro._s_addr);
4580                                                 net->ro._s_addr = NULL;
4581                                         }
4582                                         net->src_addr_selected = 0;
4583                                 }
4584                                 if ((ro->ro_nh != NULL) && (net->ro._s_addr) &&
4585                                     ((net->dest_state & SCTP_ADDR_NO_PMTUD) == 0)) {
4586                                         uint32_t mtu;
4587
4588                                         mtu = SCTP_GATHER_MTU_FROM_ROUTE(net->ro._s_addr, &net->ro._l_addr.sa, ro->ro_nh);
4589                                         if (mtu > 0) {
4590                                                 if (net->port) {
4591                                                         mtu -= sizeof(struct udphdr);
4592                                                 }
4593                                                 if (mtu < net->mtu) {
4594                                                         net->mtu = mtu;
4595                                                         if ((stcb != NULL) && (stcb->asoc.smallest_mtu > mtu)) {
4596                                                                 sctp_pathmtu_adjustment(stcb, mtu, false);
4597                                                         }
4598                                                 }
4599                                         }
4600                                 } else if (ifp != NULL) {
4601                                         if ((ND_IFINFO(ifp)->linkmtu > 0) &&
4602                                             (stcb->asoc.smallest_mtu > ND_IFINFO(ifp)->linkmtu)) {
4603                                                 sctp_pathmtu_adjustment(stcb, ND_IFINFO(ifp)->linkmtu, false);
4604                                         }
4605                                 }
4606                         }
4607                         return (ret);
4608                 }
4609 #endif
4610         default:
4611                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Unknown protocol (TSNH) type %d\n",
4612                     ((struct sockaddr *)to)->sa_family);
4613                 sctp_m_freem(m);
4614                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EFAULT);
4615                 return (EFAULT);
4616         }
4617 }
4618
4619 void
4620 sctp_send_initiate(struct sctp_inpcb *inp, struct sctp_tcb *stcb, int so_locked)
4621 {
4622         struct mbuf *m, *m_last;
4623         struct sctp_nets *net;
4624         struct sctp_init_chunk *init;
4625         struct sctp_supported_addr_param *sup_addr;
4626         struct sctp_adaptation_layer_indication *ali;
4627         struct sctp_zero_checksum_acceptable *zero_chksum;
4628         struct sctp_supported_chunk_types_param *pr_supported;
4629         struct sctp_paramhdr *ph;
4630         int cnt_inits_to = 0;
4631         int error;
4632         uint16_t num_ext, chunk_len, padding_len, parameter_len;
4633
4634         /* INIT's always go to the primary (and usually ONLY address) */
4635         net = stcb->asoc.primary_destination;
4636         if (net == NULL) {
4637                 net = TAILQ_FIRST(&stcb->asoc.nets);
4638                 if (net == NULL) {
4639                         /* TSNH */
4640                         return;
4641                 }
4642                 /* we confirm any address we send an INIT to */
4643                 net->dest_state &= ~SCTP_ADDR_UNCONFIRMED;
4644                 (void)sctp_set_primary_addr(stcb, NULL, net);
4645         } else {
4646                 /* we confirm any address we send an INIT to */
4647                 net->dest_state &= ~SCTP_ADDR_UNCONFIRMED;
4648         }
4649         SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT\n");
4650 #ifdef INET6
4651         if (net->ro._l_addr.sa.sa_family == AF_INET6) {
4652                 /*
4653                  * special hook, if we are sending to link local it will not
4654                  * show up in our private address count.
4655                  */
4656                 if (IN6_IS_ADDR_LINKLOCAL(&net->ro._l_addr.sin6.sin6_addr))
4657                         cnt_inits_to = 1;
4658         }
4659 #endif
4660         if (SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
4661                 /* This case should not happen */
4662                 SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT - failed timer?\n");
4663                 return;
4664         }
4665         /* start the INIT timer */
4666         sctp_timer_start(SCTP_TIMER_TYPE_INIT, inp, stcb, net);
4667
4668         m = sctp_get_mbuf_for_msg(MCLBYTES, 1, M_NOWAIT, 1, MT_DATA);
4669         if (m == NULL) {
4670                 /* No memory, INIT timer will re-attempt. */
4671                 SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT - mbuf?\n");
4672                 return;
4673         }
4674         chunk_len = (uint16_t)sizeof(struct sctp_init_chunk);
4675         padding_len = 0;
4676         /* Now lets put the chunk header in place */
4677         init = mtod(m, struct sctp_init_chunk *);
4678         /* now the chunk header */
4679         init->ch.chunk_type = SCTP_INITIATION;
4680         init->ch.chunk_flags = 0;
4681         /* fill in later from mbuf we build */
4682         init->ch.chunk_length = 0;
4683         /* place in my tag */
4684         init->init.initiate_tag = htonl(stcb->asoc.my_vtag);
4685         /* set up some of the credits. */
4686         init->init.a_rwnd = htonl(max(inp->sctp_socket ? SCTP_SB_LIMIT_RCV(inp->sctp_socket) : 0,
4687             SCTP_MINIMAL_RWND));
4688         init->init.num_outbound_streams = htons(stcb->asoc.pre_open_streams);
4689         init->init.num_inbound_streams = htons(stcb->asoc.max_inbound_streams);
4690         init->init.initial_tsn = htonl(stcb->asoc.init_seq_number);
4691
4692         /* Adaptation layer indication parameter */
4693         if (inp->sctp_ep.adaptation_layer_indicator_provided) {
4694                 parameter_len = (uint16_t)sizeof(struct sctp_adaptation_layer_indication);
4695                 ali = (struct sctp_adaptation_layer_indication *)(mtod(m, caddr_t)+chunk_len);
4696                 ali->ph.param_type = htons(SCTP_ULP_ADAPTATION);
4697                 ali->ph.param_length = htons(parameter_len);
4698                 ali->indication = htonl(inp->sctp_ep.adaptation_layer_indicator);
4699                 chunk_len += parameter_len;
4700         }
4701
4702         /* ECN parameter */
4703         if (stcb->asoc.ecn_supported == 1) {
4704                 parameter_len = (uint16_t)sizeof(struct sctp_paramhdr);
4705                 ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
4706                 ph->param_type = htons(SCTP_ECN_CAPABLE);
4707                 ph->param_length = htons(parameter_len);
4708                 chunk_len += parameter_len;
4709         }
4710
4711         /* PR-SCTP supported parameter */
4712         if (stcb->asoc.prsctp_supported == 1) {
4713                 parameter_len = (uint16_t)sizeof(struct sctp_paramhdr);
4714                 ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
4715                 ph->param_type = htons(SCTP_PRSCTP_SUPPORTED);
4716                 ph->param_length = htons(parameter_len);
4717                 chunk_len += parameter_len;
4718         }
4719
4720         /* Zero checksum acceptable parameter */
4721         if (stcb->asoc.rcv_edmid != SCTP_EDMID_NONE) {
4722                 parameter_len = (uint16_t)sizeof(struct sctp_zero_checksum_acceptable);
4723                 zero_chksum = (struct sctp_zero_checksum_acceptable *)(mtod(m, caddr_t)+chunk_len);
4724                 zero_chksum->ph.param_type = htons(SCTP_ZERO_CHECKSUM_ACCEPTABLE);
4725                 zero_chksum->ph.param_length = htons(parameter_len);
4726                 zero_chksum->edmid = htonl(stcb->asoc.rcv_edmid);
4727                 chunk_len += parameter_len;
4728         }
4729
4730         /* Add NAT friendly parameter. */
4731         if (SCTP_BASE_SYSCTL(sctp_inits_include_nat_friendly)) {
4732                 parameter_len = (uint16_t)sizeof(struct sctp_paramhdr);
4733                 ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
4734                 ph->param_type = htons(SCTP_HAS_NAT_SUPPORT);
4735                 ph->param_length = htons(parameter_len);
4736                 chunk_len += parameter_len;
4737         }
4738
4739         /* And now tell the peer which extensions we support */
4740         num_ext = 0;
4741         pr_supported = (struct sctp_supported_chunk_types_param *)(mtod(m, caddr_t)+chunk_len);
4742         if (stcb->asoc.prsctp_supported == 1) {
4743                 pr_supported->chunk_types[num_ext++] = SCTP_FORWARD_CUM_TSN;
4744                 if (stcb->asoc.idata_supported) {
4745                         pr_supported->chunk_types[num_ext++] = SCTP_IFORWARD_CUM_TSN;
4746                 }
4747         }
4748         if (stcb->asoc.auth_supported == 1) {
4749                 pr_supported->chunk_types[num_ext++] = SCTP_AUTHENTICATION;
4750         }
4751         if (stcb->asoc.asconf_supported == 1) {
4752                 pr_supported->chunk_types[num_ext++] = SCTP_ASCONF;
4753                 pr_supported->chunk_types[num_ext++] = SCTP_ASCONF_ACK;
4754         }
4755         if (stcb->asoc.reconfig_supported == 1) {
4756                 pr_supported->chunk_types[num_ext++] = SCTP_STREAM_RESET;
4757         }
4758         if (stcb->asoc.idata_supported) {
4759                 pr_supported->chunk_types[num_ext++] = SCTP_IDATA;
4760         }
4761         if (stcb->asoc.nrsack_supported == 1) {
4762                 pr_supported->chunk_types[num_ext++] = SCTP_NR_SELECTIVE_ACK;
4763         }
4764         if (stcb->asoc.pktdrop_supported == 1) {
4765                 pr_supported->chunk_types[num_ext++] = SCTP_PACKET_DROPPED;
4766         }
4767         if (num_ext > 0) {
4768                 parameter_len = (uint16_t)sizeof(struct sctp_supported_chunk_types_param) + num_ext;
4769                 pr_supported->ph.param_type = htons(SCTP_SUPPORTED_CHUNK_EXT);
4770                 pr_supported->ph.param_length = htons(parameter_len);
4771                 padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
4772                 chunk_len += parameter_len;
4773         }
4774         /* add authentication parameters */
4775         if (stcb->asoc.auth_supported) {
4776                 /* attach RANDOM parameter, if available */
4777                 if (stcb->asoc.authinfo.random != NULL) {
4778                         struct sctp_auth_random *randp;
4779
4780                         if (padding_len > 0) {
4781                                 memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
4782                                 chunk_len += padding_len;
4783                                 padding_len = 0;
4784                         }
4785                         randp = (struct sctp_auth_random *)(mtod(m, caddr_t)+chunk_len);
4786                         parameter_len = (uint16_t)sizeof(struct sctp_auth_random) + stcb->asoc.authinfo.random_len;
4787                         /* random key already contains the header */
4788                         memcpy(randp, stcb->asoc.authinfo.random->key, parameter_len);
4789                         padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
4790                         chunk_len += parameter_len;
4791                 }
4792                 /* add HMAC_ALGO parameter */
4793                 if (stcb->asoc.local_hmacs != NULL) {
4794                         struct sctp_auth_hmac_algo *hmacs;
4795
4796                         if (padding_len > 0) {
4797                                 memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
4798                                 chunk_len += padding_len;
4799                                 padding_len = 0;
4800                         }
4801                         hmacs = (struct sctp_auth_hmac_algo *)(mtod(m, caddr_t)+chunk_len);
4802                         parameter_len = (uint16_t)(sizeof(struct sctp_auth_hmac_algo) +
4803                             stcb->asoc.local_hmacs->num_algo * sizeof(uint16_t));
4804                         hmacs->ph.param_type = htons(SCTP_HMAC_LIST);
4805                         hmacs->ph.param_length = htons(parameter_len);
4806                         sctp_serialize_hmaclist(stcb->asoc.local_hmacs, (uint8_t *)hmacs->hmac_ids);
4807                         padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
4808                         chunk_len += parameter_len;
4809                 }
4810                 /* add CHUNKS parameter */
4811                 if (stcb->asoc.local_auth_chunks != NULL) {
4812                         struct sctp_auth_chunk_list *chunks;
4813
4814                         if (padding_len > 0) {
4815                                 memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
4816                                 chunk_len += padding_len;
4817                                 padding_len = 0;
4818                         }
4819                         chunks = (struct sctp_auth_chunk_list *)(mtod(m, caddr_t)+chunk_len);
4820                         parameter_len = (uint16_t)(sizeof(struct sctp_auth_chunk_list) +
4821                             sctp_auth_get_chklist_size(stcb->asoc.local_auth_chunks));
4822                         chunks->ph.param_type = htons(SCTP_CHUNK_LIST);
4823                         chunks->ph.param_length = htons(parameter_len);
4824                         sctp_serialize_auth_chunks(stcb->asoc.local_auth_chunks, chunks->chunk_types);
4825                         padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
4826                         chunk_len += parameter_len;
4827                 }
4828         }
4829
4830         /* now any cookie time extensions */
4831         if (stcb->asoc.cookie_preserve_req > 0) {
4832                 struct sctp_cookie_perserve_param *cookie_preserve;
4833
4834                 if (padding_len > 0) {
4835                         memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
4836                         chunk_len += padding_len;
4837                         padding_len = 0;
4838                 }
4839                 parameter_len = (uint16_t)sizeof(struct sctp_cookie_perserve_param);
4840                 cookie_preserve = (struct sctp_cookie_perserve_param *)(mtod(m, caddr_t)+chunk_len);
4841                 cookie_preserve->ph.param_type = htons(SCTP_COOKIE_PRESERVE);
4842                 cookie_preserve->ph.param_length = htons(parameter_len);
4843                 cookie_preserve->time = htonl(stcb->asoc.cookie_preserve_req);
4844                 stcb->asoc.cookie_preserve_req = 0;
4845                 chunk_len += parameter_len;
4846         }
4847
4848         if (stcb->asoc.scope.ipv4_addr_legal || stcb->asoc.scope.ipv6_addr_legal) {
4849                 uint8_t i;
4850
4851                 if (padding_len > 0) {
4852                         memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
4853                         chunk_len += padding_len;
4854                         padding_len = 0;
4855                 }
4856                 parameter_len = (uint16_t)sizeof(struct sctp_paramhdr);
4857                 if (stcb->asoc.scope.ipv4_addr_legal) {
4858                         parameter_len += (uint16_t)sizeof(uint16_t);
4859                 }
4860                 if (stcb->asoc.scope.ipv6_addr_legal) {
4861                         parameter_len += (uint16_t)sizeof(uint16_t);
4862                 }
4863                 sup_addr = (struct sctp_supported_addr_param *)(mtod(m, caddr_t)+chunk_len);
4864                 sup_addr->ph.param_type = htons(SCTP_SUPPORTED_ADDRTYPE);
4865                 sup_addr->ph.param_length = htons(parameter_len);
4866                 i = 0;
4867                 if (stcb->asoc.scope.ipv4_addr_legal) {
4868                         sup_addr->addr_type[i++] = htons(SCTP_IPV4_ADDRESS);
4869                 }
4870                 if (stcb->asoc.scope.ipv6_addr_legal) {
4871                         sup_addr->addr_type[i++] = htons(SCTP_IPV6_ADDRESS);
4872                 }
4873                 padding_len = 4 - 2 * i;
4874                 chunk_len += parameter_len;
4875         }
4876
4877         SCTP_BUF_LEN(m) = chunk_len;
4878         /* now the addresses */
4879         /*
4880          * To optimize this we could put the scoping stuff into a structure
4881          * and remove the individual uint8's from the assoc structure. Then
4882          * we could just sifa in the address within the stcb. But for now
4883          * this is a quick hack to get the address stuff teased apart.
4884          */
4885         m_last = sctp_add_addresses_to_i_ia(inp, stcb, &stcb->asoc.scope,
4886             m, cnt_inits_to,
4887             &padding_len, &chunk_len);
4888
4889         init->ch.chunk_length = htons(chunk_len);
4890         if (padding_len > 0) {
4891                 if (sctp_add_pad_tombuf(m_last, padding_len) == NULL) {
4892                         sctp_m_freem(m);
4893                         return;
4894                 }
4895         }
4896         SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT - calls lowlevel_output\n");
4897         if ((error = sctp_lowlevel_chunk_output(inp, stcb, net,
4898             (struct sockaddr *)&net->ro._l_addr,
4899             m, 0, NULL, 0, 0, 0, 0,
4900             inp->sctp_lport, stcb->rport, htonl(0),
4901             net->port, NULL,
4902             0, 0,
4903             false, so_locked))) {
4904                 SCTPDBG(SCTP_DEBUG_OUTPUT4, "Gak send error %d\n", error);
4905                 if (error == ENOBUFS) {
4906                         stcb->asoc.ifp_had_enobuf = 1;
4907                         SCTP_STAT_INCR(sctps_lowlevelerr);
4908                 }
4909         } else {
4910                 stcb->asoc.ifp_had_enobuf = 0;
4911         }
4912         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
4913         (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
4914 }
4915
4916 struct mbuf *
4917 sctp_arethere_unrecognized_parameters(struct mbuf *in_initpkt,
4918     int param_offset, int *abort_processing,
4919     struct sctp_chunkhdr *cp,
4920     int *nat_friendly,
4921     int *cookie_found)
4922 {
4923         /*
4924          * Given a mbuf containing an INIT or INIT-ACK with the param_offset
4925          * being equal to the beginning of the params i.e. (iphlen +
4926          * sizeof(struct sctp_init_msg) parse through the parameters to the
4927          * end of the mbuf verifying that all parameters are known.
4928          *
4929          * For unknown parameters build and return a mbuf with
4930          * UNRECOGNIZED_PARAMETER errors. If the flags indicate to stop
4931          * processing this chunk stop, and set *abort_processing to 1.
4932          *
4933          * By having param_offset be pre-set to where parameters begin it is
4934          * hoped that this routine may be reused in the future by new
4935          * features.
4936          */
4937         struct sctp_paramhdr *phdr, params;
4938
4939         struct mbuf *mat, *m_tmp, *op_err, *op_err_last;
4940         int at, limit, pad_needed;
4941         uint16_t ptype, plen, padded_size;
4942
4943         *abort_processing = 0;
4944         if (cookie_found != NULL) {
4945                 *cookie_found = 0;
4946         }
4947         mat = in_initpkt;
4948         limit = ntohs(cp->chunk_length) - sizeof(struct sctp_init_chunk);
4949         at = param_offset;
4950         op_err = NULL;
4951         op_err_last = NULL;
4952         pad_needed = 0;
4953         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Check for unrecognized param's\n");
4954         phdr = sctp_get_next_param(mat, at, &params, sizeof(params));
4955         while ((phdr != NULL) && ((size_t)limit >= sizeof(struct sctp_paramhdr))) {
4956                 ptype = ntohs(phdr->param_type);
4957                 plen = ntohs(phdr->param_length);
4958                 if ((plen > limit) || (plen < sizeof(struct sctp_paramhdr))) {
4959                         /* wacked parameter */
4960                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error %d\n", plen);
4961                         goto invalid_size;
4962                 }
4963                 limit -= SCTP_SIZE32(plen);
4964                 /*-
4965                  * All parameters for all chunks that we know/understand are
4966                  * listed here. We process them other places and make
4967                  * appropriate stop actions per the upper bits. However this
4968                  * is the generic routine processor's can call to get back
4969                  * an operr.. to either incorporate (init-ack) or send.
4970                  */
4971                 padded_size = SCTP_SIZE32(plen);
4972                 switch (ptype) {
4973                         /* Param's with variable size */
4974                 case SCTP_HEARTBEAT_INFO:
4975                 case SCTP_UNRECOG_PARAM:
4976                 case SCTP_ERROR_CAUSE_IND:
4977                         /* ok skip fwd */
4978                         at += padded_size;
4979                         break;
4980                 case SCTP_STATE_COOKIE:
4981                         if (cookie_found != NULL) {
4982                                 *cookie_found = 1;
4983                         }
4984                         at += padded_size;
4985                         break;
4986                         /* Param's with variable size within a range */
4987                 case SCTP_CHUNK_LIST:
4988                 case SCTP_SUPPORTED_CHUNK_EXT:
4989                         if (padded_size > (sizeof(struct sctp_supported_chunk_types_param) + (sizeof(uint8_t) * SCTP_MAX_SUPPORTED_EXT))) {
4990                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error chklist %d\n", plen);
4991                                 goto invalid_size;
4992                         }
4993                         at += padded_size;
4994                         break;
4995                 case SCTP_SUPPORTED_ADDRTYPE:
4996                         if (padded_size > SCTP_MAX_ADDR_PARAMS_SIZE) {
4997                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error supaddrtype %d\n", plen);
4998                                 goto invalid_size;
4999                         }
5000                         at += padded_size;
5001                         break;
5002                 case SCTP_RANDOM:
5003                         if (padded_size > (sizeof(struct sctp_auth_random) + SCTP_RANDOM_MAX_SIZE)) {
5004                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error random %d\n", plen);
5005                                 goto invalid_size;
5006                         }
5007                         at += padded_size;
5008                         break;
5009                 case SCTP_SET_PRIM_ADDR:
5010                 case SCTP_DEL_IP_ADDRESS:
5011                 case SCTP_ADD_IP_ADDRESS:
5012                         if ((padded_size != sizeof(struct sctp_asconf_addrv4_param)) &&
5013                             (padded_size != sizeof(struct sctp_asconf_addr_param))) {
5014                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error setprim %d\n", plen);
5015                                 goto invalid_size;
5016                         }
5017                         at += padded_size;
5018                         break;
5019                         /* Param's with a fixed size */
5020                 case SCTP_IPV4_ADDRESS:
5021                         if (padded_size != sizeof(struct sctp_ipv4addr_param)) {
5022                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error ipv4 addr %d\n", plen);
5023                                 goto invalid_size;
5024                         }
5025                         at += padded_size;
5026                         break;
5027                 case SCTP_IPV6_ADDRESS:
5028                         if (padded_size != sizeof(struct sctp_ipv6addr_param)) {
5029                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error ipv6 addr %d\n", plen);
5030                                 goto invalid_size;
5031                         }
5032                         at += padded_size;
5033                         break;
5034                 case SCTP_COOKIE_PRESERVE:
5035                         if (padded_size != sizeof(struct sctp_cookie_perserve_param)) {
5036                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error cookie-preserve %d\n", plen);
5037                                 goto invalid_size;
5038                         }
5039                         at += padded_size;
5040                         break;
5041                 case SCTP_HAS_NAT_SUPPORT:
5042                         *nat_friendly = 1;
5043                         /* FALLTHROUGH */
5044                 case SCTP_PRSCTP_SUPPORTED:
5045                         if (padded_size != sizeof(struct sctp_paramhdr)) {
5046                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error prsctp/nat support %d\n", plen);
5047                                 goto invalid_size;
5048                         }
5049                         at += padded_size;
5050                         break;
5051                 case SCTP_ECN_CAPABLE:
5052                         if (padded_size != sizeof(struct sctp_paramhdr)) {
5053                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error ecn %d\n", plen);
5054                                 goto invalid_size;
5055                         }
5056                         at += padded_size;
5057                         break;
5058                 case SCTP_ULP_ADAPTATION:
5059                         if (padded_size != sizeof(struct sctp_adaptation_layer_indication)) {
5060                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error adapatation %d\n", plen);
5061                                 goto invalid_size;
5062                         }
5063                         at += padded_size;
5064                         break;
5065                 case SCTP_SUCCESS_REPORT:
5066                         if (padded_size != sizeof(struct sctp_asconf_paramhdr)) {
5067                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error success %d\n", plen);
5068                                 goto invalid_size;
5069                         }
5070                         at += padded_size;
5071                         break;
5072                 case SCTP_HOSTNAME_ADDRESS:
5073                         {
5074                                 /* Hostname parameters are deprecated. */
5075                                 struct sctp_gen_error_cause *cause;
5076                                 int l_len;
5077
5078                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Can't handle hostname addresses.. abort processing\n");
5079                                 *abort_processing = 1;
5080                                 sctp_m_freem(op_err);
5081                                 op_err = NULL;
5082                                 op_err_last = NULL;
5083 #ifdef INET6
5084                                 l_len = SCTP_MIN_OVERHEAD;
5085 #else
5086                                 l_len = SCTP_MIN_V4_OVERHEAD;
5087 #endif
5088                                 l_len += sizeof(struct sctp_chunkhdr);
5089                                 l_len += sizeof(struct sctp_gen_error_cause);
5090                                 op_err = sctp_get_mbuf_for_msg(l_len, 0, M_NOWAIT, 1, MT_DATA);
5091                                 if (op_err != NULL) {
5092                                         /*
5093                                          * Pre-reserve space for IP, SCTP,
5094                                          * and chunk header.
5095                                          */
5096 #ifdef INET6
5097                                         SCTP_BUF_RESV_UF(op_err, sizeof(struct ip6_hdr));
5098 #else
5099                                         SCTP_BUF_RESV_UF(op_err, sizeof(struct ip));
5100 #endif
5101                                         SCTP_BUF_RESV_UF(op_err, sizeof(struct sctphdr));
5102                                         SCTP_BUF_RESV_UF(op_err, sizeof(struct sctp_chunkhdr));
5103                                         SCTP_BUF_LEN(op_err) = sizeof(struct sctp_gen_error_cause);
5104                                         cause = mtod(op_err, struct sctp_gen_error_cause *);
5105                                         cause->code = htons(SCTP_CAUSE_UNRESOLVABLE_ADDR);
5106                                         cause->length = htons((uint16_t)(sizeof(struct sctp_gen_error_cause) + plen));
5107                                         SCTP_BUF_NEXT(op_err) = SCTP_M_COPYM(mat, at, plen, M_NOWAIT);
5108                                         if (SCTP_BUF_NEXT(op_err) == NULL) {
5109                                                 sctp_m_freem(op_err);
5110                                                 op_err = NULL;
5111                                                 op_err_last = NULL;
5112                                         }
5113                                 }
5114                                 return (op_err);
5115                         }
5116                 default:
5117                         /*
5118                          * we do not recognize the parameter figure out what
5119                          * we do.
5120                          */
5121                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Hit default param %x\n", ptype);
5122                         if ((ptype & 0x4000) == 0x4000) {
5123                                 /* Report bit is set?? */
5124                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "report op err\n");
5125                                 if (op_err == NULL) {
5126                                         int l_len;
5127
5128                                         /* Ok need to try to get an mbuf */
5129 #ifdef INET6
5130                                         l_len = SCTP_MIN_OVERHEAD;
5131 #else
5132                                         l_len = SCTP_MIN_V4_OVERHEAD;
5133 #endif
5134                                         l_len += sizeof(struct sctp_chunkhdr);
5135                                         l_len += sizeof(struct sctp_paramhdr);
5136                                         op_err = sctp_get_mbuf_for_msg(l_len, 0, M_NOWAIT, 1, MT_DATA);
5137                                         if (op_err) {
5138                                                 SCTP_BUF_LEN(op_err) = 0;
5139 #ifdef INET6
5140                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip6_hdr));
5141 #else
5142                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip));
5143 #endif
5144                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctphdr));
5145                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctp_chunkhdr));
5146                                                 op_err_last = op_err;
5147                                         }
5148                                 }
5149                                 if (op_err != NULL) {
5150                                         /* If we have space */
5151                                         struct sctp_paramhdr *param;
5152
5153                                         if (pad_needed > 0) {
5154                                                 op_err_last = sctp_add_pad_tombuf(op_err_last, pad_needed);
5155                                         }
5156                                         if (op_err_last == NULL) {
5157                                                 sctp_m_freem(op_err);
5158                                                 op_err = NULL;
5159                                                 op_err_last = NULL;
5160                                                 goto more_processing;
5161                                         }
5162                                         if (M_TRAILINGSPACE(op_err_last) < (int)sizeof(struct sctp_paramhdr)) {
5163                                                 m_tmp = sctp_get_mbuf_for_msg(sizeof(struct sctp_paramhdr), 0, M_NOWAIT, 1, MT_DATA);
5164                                                 if (m_tmp == NULL) {
5165                                                         sctp_m_freem(op_err);
5166                                                         op_err = NULL;
5167                                                         op_err_last = NULL;
5168                                                         goto more_processing;
5169                                                 }
5170                                                 SCTP_BUF_LEN(m_tmp) = 0;
5171                                                 SCTP_BUF_NEXT(m_tmp) = NULL;
5172                                                 SCTP_BUF_NEXT(op_err_last) = m_tmp;
5173                                                 op_err_last = m_tmp;
5174                                         }
5175                                         param = (struct sctp_paramhdr *)(mtod(op_err_last, caddr_t)+SCTP_BUF_LEN(op_err_last));
5176                                         param->param_type = htons(SCTP_UNRECOG_PARAM);
5177                                         param->param_length = htons((uint16_t)sizeof(struct sctp_paramhdr) + plen);
5178                                         SCTP_BUF_LEN(op_err_last) += sizeof(struct sctp_paramhdr);
5179                                         SCTP_BUF_NEXT(op_err_last) = SCTP_M_COPYM(mat, at, plen, M_NOWAIT);
5180                                         if (SCTP_BUF_NEXT(op_err_last) == NULL) {
5181                                                 sctp_m_freem(op_err);
5182                                                 op_err = NULL;
5183                                                 op_err_last = NULL;
5184                                                 goto more_processing;
5185                                         } else {
5186                                                 while (SCTP_BUF_NEXT(op_err_last) != NULL) {
5187                                                         op_err_last = SCTP_BUF_NEXT(op_err_last);
5188                                                 }
5189                                         }
5190                                         if (plen % 4 != 0) {
5191                                                 pad_needed = 4 - (plen % 4);
5192                                         } else {
5193                                                 pad_needed = 0;
5194                                         }
5195                                 }
5196                         }
5197         more_processing:
5198                         if ((ptype & 0x8000) == 0x0000) {
5199                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "stop proc\n");
5200                                 return (op_err);
5201                         } else {
5202                                 /* skip this chunk and continue processing */
5203                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "move on\n");
5204                                 at += SCTP_SIZE32(plen);
5205                         }
5206                         break;
5207                 }
5208                 phdr = sctp_get_next_param(mat, at, &params, sizeof(params));
5209         }
5210         return (op_err);
5211 invalid_size:
5212         SCTPDBG(SCTP_DEBUG_OUTPUT1, "abort flag set\n");
5213         *abort_processing = 1;
5214         sctp_m_freem(op_err);
5215         op_err = NULL;
5216         op_err_last = NULL;
5217         if (phdr != NULL) {
5218                 struct sctp_paramhdr *param;
5219                 int l_len;
5220 #ifdef INET6
5221                 l_len = SCTP_MIN_OVERHEAD;
5222 #else
5223                 l_len = SCTP_MIN_V4_OVERHEAD;
5224 #endif
5225                 l_len += sizeof(struct sctp_chunkhdr);
5226                 l_len += (2 * sizeof(struct sctp_paramhdr));
5227                 op_err = sctp_get_mbuf_for_msg(l_len, 0, M_NOWAIT, 1, MT_DATA);
5228                 if (op_err) {
5229                         SCTP_BUF_LEN(op_err) = 0;
5230 #ifdef INET6
5231                         SCTP_BUF_RESV_UF(op_err, sizeof(struct ip6_hdr));
5232 #else
5233                         SCTP_BUF_RESV_UF(op_err, sizeof(struct ip));
5234 #endif
5235                         SCTP_BUF_RESV_UF(op_err, sizeof(struct sctphdr));
5236                         SCTP_BUF_RESV_UF(op_err, sizeof(struct sctp_chunkhdr));
5237                         SCTP_BUF_LEN(op_err) = 2 * sizeof(struct sctp_paramhdr);
5238                         param = mtod(op_err, struct sctp_paramhdr *);
5239                         param->param_type = htons(SCTP_CAUSE_PROTOCOL_VIOLATION);
5240                         param->param_length = htons(2 * sizeof(struct sctp_paramhdr));
5241                         param++;
5242                         param->param_type = htons(ptype);
5243                         param->param_length = htons(plen);
5244                 }
5245         }
5246         return (op_err);
5247 }
5248
5249 /*
5250  * Given a INIT chunk, look through the parameters to verify that there
5251  * are no new addresses.
5252  * Return true, if there is a new address or there is a problem parsing
5253    the parameters. Provide an optional error cause used when sending an ABORT.
5254  * Return false, if there are no new addresses and there is no problem in
5255    parameter processing.
5256  */
5257 static bool
5258 sctp_are_there_new_addresses(struct sctp_association *asoc,
5259     struct mbuf *in_initpkt, int offset, int limit, struct sockaddr *src,
5260     struct mbuf **op_err)
5261 {
5262         struct sockaddr *sa_touse;
5263         struct sockaddr *sa;
5264         struct sctp_paramhdr *phdr, params;
5265         struct sctp_nets *net;
5266 #ifdef INET
5267         struct sockaddr_in sin4, *sa4;
5268 #endif
5269 #ifdef INET6
5270         struct sockaddr_in6 sin6, *sa6;
5271 #endif
5272         uint16_t ptype, plen;
5273         bool fnd, check_src;
5274
5275         *op_err = NULL;
5276 #ifdef INET
5277         memset(&sin4, 0, sizeof(sin4));
5278         sin4.sin_family = AF_INET;
5279         sin4.sin_len = sizeof(sin4);
5280 #endif
5281 #ifdef INET6
5282         memset(&sin6, 0, sizeof(sin6));
5283         sin6.sin6_family = AF_INET6;
5284         sin6.sin6_len = sizeof(sin6);
5285 #endif
5286         /* First what about the src address of the pkt ? */
5287         check_src = false;
5288         switch (src->sa_family) {
5289 #ifdef INET
5290         case AF_INET:
5291                 if (asoc->scope.ipv4_addr_legal) {
5292                         check_src = true;
5293                 }
5294                 break;
5295 #endif
5296 #ifdef INET6
5297         case AF_INET6:
5298                 if (asoc->scope.ipv6_addr_legal) {
5299                         check_src = true;
5300                 }
5301                 break;
5302 #endif
5303         default:
5304                 /* TSNH */
5305                 break;
5306         }
5307         if (check_src) {
5308                 fnd = false;
5309                 TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
5310                         sa = (struct sockaddr *)&net->ro._l_addr;
5311                         if (sa->sa_family == src->sa_family) {
5312 #ifdef INET
5313                                 if (sa->sa_family == AF_INET) {
5314                                         struct sockaddr_in *src4;
5315
5316                                         sa4 = (struct sockaddr_in *)sa;
5317                                         src4 = (struct sockaddr_in *)src;
5318                                         if (sa4->sin_addr.s_addr == src4->sin_addr.s_addr) {
5319                                                 fnd = true;
5320                                                 break;
5321                                         }
5322                                 }
5323 #endif
5324 #ifdef INET6
5325                                 if (sa->sa_family == AF_INET6) {
5326                                         struct sockaddr_in6 *src6;
5327
5328                                         sa6 = (struct sockaddr_in6 *)sa;
5329                                         src6 = (struct sockaddr_in6 *)src;
5330                                         if (SCTP6_ARE_ADDR_EQUAL(sa6, src6)) {
5331                                                 fnd = true;
5332                                                 break;
5333                                         }
5334                                 }
5335 #endif
5336                         }
5337                 }
5338                 if (!fnd) {
5339                         /*
5340                          * If sending an ABORT in case of an additional
5341                          * address, don't use the new address error cause.
5342                          * This looks no different than if no listener was
5343                          * present.
5344                          */
5345                         *op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), "Address added");
5346                         return (true);
5347                 }
5348         }
5349         /* Ok so far lets munge through the rest of the packet */
5350         offset += sizeof(struct sctp_init_chunk);
5351         phdr = sctp_get_next_param(in_initpkt, offset, &params, sizeof(params));
5352         while (phdr) {
5353                 sa_touse = NULL;
5354                 ptype = ntohs(phdr->param_type);
5355                 plen = ntohs(phdr->param_length);
5356                 if (offset + plen > limit) {
5357                         *op_err = sctp_generate_cause(SCTP_CAUSE_PROTOCOL_VIOLATION, "Partial parameter");
5358                         return (true);
5359                 }
5360                 if (plen < sizeof(struct sctp_paramhdr)) {
5361                         *op_err = sctp_generate_cause(SCTP_CAUSE_PROTOCOL_VIOLATION, "Parameter length too small");
5362                         return (true);
5363                 }
5364                 switch (ptype) {
5365 #ifdef INET
5366                 case SCTP_IPV4_ADDRESS:
5367                         {
5368                                 struct sctp_ipv4addr_param *p4, p4_buf;
5369
5370                                 if (plen != sizeof(struct sctp_ipv4addr_param)) {
5371                                         *op_err = sctp_generate_cause(SCTP_CAUSE_PROTOCOL_VIOLATION, "Parameter length illegal");
5372                                         return (true);
5373                                 }
5374                                 phdr = sctp_get_next_param(in_initpkt, offset,
5375                                     (struct sctp_paramhdr *)&p4_buf, sizeof(p4_buf));
5376                                 if (phdr == NULL) {
5377                                         *op_err = sctp_generate_cause(SCTP_CAUSE_PROTOCOL_VIOLATION, "");
5378                                         return (true);
5379                                 }
5380                                 if (asoc->scope.ipv4_addr_legal) {
5381                                         p4 = (struct sctp_ipv4addr_param *)phdr;
5382                                         sin4.sin_addr.s_addr = p4->addr;
5383                                         sa_touse = (struct sockaddr *)&sin4;
5384                                 }
5385                                 break;
5386                         }
5387 #endif
5388 #ifdef INET6
5389                 case SCTP_IPV6_ADDRESS:
5390                         {
5391                                 struct sctp_ipv6addr_param *p6, p6_buf;
5392
5393                                 if (plen != sizeof(struct sctp_ipv6addr_param)) {
5394                                         *op_err = sctp_generate_cause(SCTP_CAUSE_PROTOCOL_VIOLATION, "Parameter length illegal");
5395                                         return (true);
5396                                 }
5397                                 phdr = sctp_get_next_param(in_initpkt, offset,
5398                                     (struct sctp_paramhdr *)&p6_buf, sizeof(p6_buf));
5399                                 if (phdr == NULL) {
5400                                         *op_err = sctp_generate_cause(SCTP_CAUSE_PROTOCOL_VIOLATION, "");
5401                                         return (true);
5402                                 }
5403                                 if (asoc->scope.ipv6_addr_legal) {
5404                                         p6 = (struct sctp_ipv6addr_param *)phdr;
5405                                         memcpy((caddr_t)&sin6.sin6_addr, p6->addr,
5406                                             sizeof(p6->addr));
5407                                         sa_touse = (struct sockaddr *)&sin6;
5408                                 }
5409                                 break;
5410                         }
5411 #endif
5412                 default:
5413                         sa_touse = NULL;
5414                         break;
5415                 }
5416                 if (sa_touse) {
5417                         /* ok, sa_touse points to one to check */
5418                         fnd = false;
5419                         TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
5420                                 sa = (struct sockaddr *)&net->ro._l_addr;
5421                                 if (sa->sa_family != sa_touse->sa_family) {
5422                                         continue;
5423                                 }
5424 #ifdef INET
5425                                 if (sa->sa_family == AF_INET) {
5426                                         sa4 = (struct sockaddr_in *)sa;
5427                                         if (sa4->sin_addr.s_addr ==
5428                                             sin4.sin_addr.s_addr) {
5429                                                 fnd = true;
5430                                                 break;
5431                                         }
5432                                 }
5433 #endif
5434 #ifdef INET6
5435                                 if (sa->sa_family == AF_INET6) {
5436                                         sa6 = (struct sockaddr_in6 *)sa;
5437                                         if (SCTP6_ARE_ADDR_EQUAL(
5438                                             sa6, &sin6)) {
5439                                                 fnd = true;
5440                                                 break;
5441                                         }
5442                                 }
5443 #endif
5444                         }
5445                         if (!fnd) {
5446                                 /*
5447                                  * If sending an ABORT in case of an
5448                                  * additional address, don't use the new
5449                                  * address error cause. This looks no
5450                                  * different than if no listener was
5451                                  * present.
5452                                  */
5453                                 *op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), "Address added");
5454                                 return (true);
5455                         }
5456                 }
5457                 offset += SCTP_SIZE32(plen);
5458                 if (offset >= limit) {
5459                         break;
5460                 }
5461                 phdr = sctp_get_next_param(in_initpkt, offset, &params, sizeof(params));
5462         }
5463         return (false);
5464 }
5465
5466 /*
5467  * Given a MBUF chain that was sent into us containing an INIT. Build a
5468  * INIT-ACK with COOKIE and send back. We assume that the in_initpkt has done
5469  * a pullup to include IPv6/4header, SCTP header and initial part of INIT
5470  * message (i.e. the struct sctp_init_msg).
5471  */
5472 void
5473 sctp_send_initiate_ack(struct sctp_inpcb *inp, struct sctp_tcb *stcb,
5474     struct sctp_nets *src_net, struct mbuf *init_pkt,
5475     int iphlen, int offset,
5476     struct sockaddr *src, struct sockaddr *dst,
5477     struct sctphdr *sh, struct sctp_init_chunk *init_chk,
5478     uint8_t mflowtype, uint32_t mflowid,
5479     uint32_t vrf_id, uint16_t port)
5480 {
5481         struct sctp_association *asoc;
5482         struct mbuf *m, *m_tmp, *m_last, *m_cookie, *op_err;
5483         struct sctp_init_ack_chunk *initack;
5484         struct sctp_adaptation_layer_indication *ali;
5485         struct sctp_zero_checksum_acceptable *zero_chksum;
5486         struct sctp_supported_chunk_types_param *pr_supported;
5487         struct sctp_paramhdr *ph;
5488         union sctp_sockstore *over_addr;
5489         struct sctp_scoping scp;
5490         struct timeval now;
5491 #ifdef INET
5492         struct sockaddr_in *dst4 = (struct sockaddr_in *)dst;
5493         struct sockaddr_in *src4 = (struct sockaddr_in *)src;
5494         struct sockaddr_in *sin;
5495 #endif
5496 #ifdef INET6
5497         struct sockaddr_in6 *dst6 = (struct sockaddr_in6 *)dst;
5498         struct sockaddr_in6 *src6 = (struct sockaddr_in6 *)src;
5499         struct sockaddr_in6 *sin6;
5500 #endif
5501         struct sockaddr *to;
5502         struct sctp_state_cookie stc;
5503         struct sctp_nets *net = NULL;
5504         uint8_t *signature = NULL;
5505         int cnt_inits_to = 0;
5506         uint16_t his_limit, i_want;
5507         int abort_flag;
5508         int nat_friendly = 0;
5509         int error;
5510         struct socket *so;
5511         uint16_t num_ext, chunk_len, padding_len, parameter_len;
5512
5513         if (stcb) {
5514                 asoc = &stcb->asoc;
5515         } else {
5516                 asoc = NULL;
5517         }
5518         if ((asoc != NULL) &&
5519             (SCTP_GET_STATE(stcb) != SCTP_STATE_COOKIE_WAIT)) {
5520                 if (sctp_are_there_new_addresses(asoc, init_pkt, offset, offset + ntohs(init_chk->ch.chunk_length), src, &op_err)) {
5521                         /*
5522                          * new addresses, out of here in non-cookie-wait
5523                          * states
5524                          */
5525                         sctp_send_abort(init_pkt, iphlen, src, dst, sh, 0, op_err,
5526                             mflowtype, mflowid, inp->fibnum,
5527                             vrf_id, port);
5528                         return;
5529                 }
5530                 if (src_net != NULL && (src_net->port != port)) {
5531                         /*
5532                          * change of remote encapsulation port, out of here
5533                          * in non-cookie-wait states
5534                          *
5535                          * Send an ABORT, without an specific error cause.
5536                          * This looks no different than if no listener was
5537                          * present.
5538                          */
5539                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
5540                             "Remote encapsulation port changed");
5541                         sctp_send_abort(init_pkt, iphlen, src, dst, sh, 0, op_err,
5542                             mflowtype, mflowid, inp->fibnum,
5543                             vrf_id, port);
5544                         return;
5545                 }
5546         }
5547         abort_flag = 0;
5548         op_err = sctp_arethere_unrecognized_parameters(init_pkt,
5549             (offset + sizeof(struct sctp_init_chunk)),
5550             &abort_flag,
5551             (struct sctp_chunkhdr *)init_chk,
5552             &nat_friendly, NULL);
5553         if (abort_flag) {
5554 do_a_abort:
5555                 if (op_err == NULL) {
5556                         char msg[SCTP_DIAG_INFO_LEN];
5557
5558                         SCTP_SNPRINTF(msg, sizeof(msg), "%s:%d at %s", __FILE__, __LINE__, __func__);
5559                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
5560                             msg);
5561                 }
5562                 sctp_send_abort(init_pkt, iphlen, src, dst, sh,
5563                     init_chk->init.initiate_tag, op_err,
5564                     mflowtype, mflowid, inp->fibnum,
5565                     vrf_id, port);
5566                 return;
5567         }
5568         m = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
5569         if (m == NULL) {
5570                 /* No memory, INIT timer will re-attempt. */
5571                 sctp_m_freem(op_err);
5572                 return;
5573         }
5574         chunk_len = (uint16_t)sizeof(struct sctp_init_ack_chunk);
5575         padding_len = 0;
5576
5577         /*
5578          * We might not overwrite the identification[] completely and on
5579          * some platforms time_entered will contain some padding. Therefore
5580          * zero out the cookie to avoid putting uninitialized memory on the
5581          * wire.
5582          */
5583         memset(&stc, 0, sizeof(struct sctp_state_cookie));
5584
5585         /* the time I built cookie */
5586         (void)SCTP_GETTIME_TIMEVAL(&now);
5587         stc.time_entered.tv_sec = now.tv_sec;
5588         stc.time_entered.tv_usec = now.tv_usec;
5589
5590         /* populate any tie tags */
5591         if (asoc != NULL) {
5592                 /* unlock before tag selections */
5593                 stc.tie_tag_my_vtag = asoc->my_vtag_nonce;
5594                 stc.tie_tag_peer_vtag = asoc->peer_vtag_nonce;
5595                 stc.cookie_life = asoc->cookie_life;
5596                 net = asoc->primary_destination;
5597         } else {
5598                 stc.tie_tag_my_vtag = 0;
5599                 stc.tie_tag_peer_vtag = 0;
5600                 /* life I will award this cookie */
5601                 stc.cookie_life = inp->sctp_ep.def_cookie_life;
5602         }
5603
5604         /* copy in the ports for later check */
5605         stc.myport = sh->dest_port;
5606         stc.peerport = sh->src_port;
5607
5608         /*
5609          * If we wanted to honor cookie life extensions, we would add to
5610          * stc.cookie_life. For now we should NOT honor any extension
5611          */
5612         stc.site_scope = stc.local_scope = stc.loopback_scope = 0;
5613         if (inp->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
5614                 stc.ipv6_addr_legal = 1;
5615                 if (SCTP_IPV6_V6ONLY(inp)) {
5616                         stc.ipv4_addr_legal = 0;
5617                 } else {
5618                         stc.ipv4_addr_legal = 1;
5619                 }
5620         } else {
5621                 stc.ipv6_addr_legal = 0;
5622                 stc.ipv4_addr_legal = 1;
5623         }
5624         stc.ipv4_scope = 0;
5625         if (net == NULL) {
5626                 to = src;
5627                 switch (dst->sa_family) {
5628 #ifdef INET
5629                 case AF_INET:
5630                         {
5631                                 /* lookup address */
5632                                 stc.address[0] = src4->sin_addr.s_addr;
5633                                 stc.address[1] = 0;
5634                                 stc.address[2] = 0;
5635                                 stc.address[3] = 0;
5636                                 stc.addr_type = SCTP_IPV4_ADDRESS;
5637                                 /* local from address */
5638                                 stc.laddress[0] = dst4->sin_addr.s_addr;
5639                                 stc.laddress[1] = 0;
5640                                 stc.laddress[2] = 0;
5641                                 stc.laddress[3] = 0;
5642                                 stc.laddr_type = SCTP_IPV4_ADDRESS;
5643                                 /* scope_id is only for v6 */
5644                                 stc.scope_id = 0;
5645                                 if ((IN4_ISPRIVATE_ADDRESS(&src4->sin_addr)) ||
5646                                     (IN4_ISPRIVATE_ADDRESS(&dst4->sin_addr))) {
5647                                         stc.ipv4_scope = 1;
5648                                 }
5649                                 /* Must use the address in this case */
5650                                 if (sctp_is_address_on_local_host(src, vrf_id)) {
5651                                         stc.loopback_scope = 1;
5652                                         stc.ipv4_scope = 1;
5653                                         stc.site_scope = 1;
5654                                         stc.local_scope = 0;
5655                                 }
5656                                 break;
5657                         }
5658 #endif
5659 #ifdef INET6
5660                 case AF_INET6:
5661                         {
5662                                 stc.addr_type = SCTP_IPV6_ADDRESS;
5663                                 memcpy(&stc.address, &src6->sin6_addr, sizeof(struct in6_addr));
5664                                 stc.scope_id = ntohs(in6_getscope(&src6->sin6_addr));
5665                                 if (sctp_is_address_on_local_host(src, vrf_id)) {
5666                                         stc.loopback_scope = 1;
5667                                         stc.local_scope = 0;
5668                                         stc.site_scope = 1;
5669                                         stc.ipv4_scope = 1;
5670                                 } else if (IN6_IS_ADDR_LINKLOCAL(&src6->sin6_addr) ||
5671                                     IN6_IS_ADDR_LINKLOCAL(&dst6->sin6_addr)) {
5672                                         /*
5673                                          * If the new destination or source
5674                                          * is a LINK_LOCAL we must have
5675                                          * common both site and local scope.
5676                                          * Don't set local scope though
5677                                          * since we must depend on the
5678                                          * source to be added implicitly. We
5679                                          * cannot assure just because we
5680                                          * share one link that all links are
5681                                          * common.
5682                                          */
5683                                         stc.local_scope = 0;
5684                                         stc.site_scope = 1;
5685                                         stc.ipv4_scope = 1;
5686                                         /*
5687                                          * we start counting for the private
5688                                          * address stuff at 1. since the
5689                                          * link local we source from won't
5690                                          * show up in our scoped count.
5691                                          */
5692                                         cnt_inits_to = 1;
5693                                         /*
5694                                          * pull out the scope_id from
5695                                          * incoming pkt
5696                                          */
5697                                 } else if (IN6_IS_ADDR_SITELOCAL(&src6->sin6_addr) ||
5698                                     IN6_IS_ADDR_SITELOCAL(&dst6->sin6_addr)) {
5699                                         /*
5700                                          * If the new destination or source
5701                                          * is SITE_LOCAL then we must have
5702                                          * site scope in common.
5703                                          */
5704                                         stc.site_scope = 1;
5705                                 }
5706                                 memcpy(&stc.laddress, &dst6->sin6_addr, sizeof(struct in6_addr));
5707                                 stc.laddr_type = SCTP_IPV6_ADDRESS;
5708                                 break;
5709                         }
5710 #endif
5711                 default:
5712                         /* TSNH */
5713                         goto do_a_abort;
5714                         break;
5715                 }
5716         } else {
5717                 /* set the scope per the existing tcb */
5718
5719 #ifdef INET6
5720                 struct sctp_nets *lnet;
5721 #endif
5722
5723                 stc.loopback_scope = asoc->scope.loopback_scope;
5724                 stc.ipv4_scope = asoc->scope.ipv4_local_scope;
5725                 stc.site_scope = asoc->scope.site_scope;
5726                 stc.local_scope = asoc->scope.local_scope;
5727 #ifdef INET6
5728                 /* Why do we not consider IPv4 LL addresses? */
5729                 TAILQ_FOREACH(lnet, &asoc->nets, sctp_next) {
5730                         if (lnet->ro._l_addr.sin6.sin6_family == AF_INET6) {
5731                                 if (IN6_IS_ADDR_LINKLOCAL(&lnet->ro._l_addr.sin6.sin6_addr)) {
5732                                         /*
5733                                          * if we have a LL address, start
5734                                          * counting at 1.
5735                                          */
5736                                         cnt_inits_to = 1;
5737                                 }
5738                         }
5739                 }
5740 #endif
5741                 /* use the net pointer */
5742                 to = (struct sockaddr *)&net->ro._l_addr;
5743                 switch (to->sa_family) {
5744 #ifdef INET
5745                 case AF_INET:
5746                         sin = (struct sockaddr_in *)to;
5747                         stc.address[0] = sin->sin_addr.s_addr;
5748                         stc.address[1] = 0;
5749                         stc.address[2] = 0;
5750                         stc.address[3] = 0;
5751                         stc.addr_type = SCTP_IPV4_ADDRESS;
5752                         if (net->src_addr_selected == 0) {
5753                                 /*
5754                                  * strange case here, the INIT should have
5755                                  * did the selection.
5756                                  */
5757                                 net->ro._s_addr = sctp_source_address_selection(inp,
5758                                     stcb, (sctp_route_t *)&net->ro,
5759                                     net, 0, vrf_id);
5760                                 if (net->ro._s_addr == NULL) {
5761                                         sctp_m_freem(op_err);
5762                                         sctp_m_freem(m);
5763                                         return;
5764                                 }
5765
5766                                 net->src_addr_selected = 1;
5767                         }
5768                         stc.laddress[0] = net->ro._s_addr->address.sin.sin_addr.s_addr;
5769                         stc.laddress[1] = 0;
5770                         stc.laddress[2] = 0;
5771                         stc.laddress[3] = 0;
5772                         stc.laddr_type = SCTP_IPV4_ADDRESS;
5773                         /* scope_id is only for v6 */
5774                         stc.scope_id = 0;
5775                         break;
5776 #endif
5777 #ifdef INET6
5778                 case AF_INET6:
5779                         sin6 = (struct sockaddr_in6 *)to;
5780                         memcpy(&stc.address, &sin6->sin6_addr,
5781                             sizeof(struct in6_addr));
5782                         stc.addr_type = SCTP_IPV6_ADDRESS;
5783                         stc.scope_id = sin6->sin6_scope_id;
5784                         if (net->src_addr_selected == 0) {
5785                                 /*
5786                                  * strange case here, the INIT should have
5787                                  * done the selection.
5788                                  */
5789                                 net->ro._s_addr = sctp_source_address_selection(inp,
5790                                     stcb, (sctp_route_t *)&net->ro,
5791                                     net, 0, vrf_id);
5792                                 if (net->ro._s_addr == NULL) {
5793                                         sctp_m_freem(op_err);
5794                                         sctp_m_freem(m);
5795                                         return;
5796                                 }
5797
5798                                 net->src_addr_selected = 1;
5799                         }
5800                         memcpy(&stc.laddress, &net->ro._s_addr->address.sin6.sin6_addr,
5801                             sizeof(struct in6_addr));
5802                         stc.laddr_type = SCTP_IPV6_ADDRESS;
5803                         break;
5804 #endif
5805                 }
5806         }
5807         if (asoc != NULL) {
5808                 stc.rcv_edmid = asoc->rcv_edmid;
5809         } else {
5810                 stc.rcv_edmid = inp->rcv_edmid;
5811         }
5812         /* Now lets put the SCTP header in place */
5813         initack = mtod(m, struct sctp_init_ack_chunk *);
5814         /* Save it off for quick ref */
5815         stc.peers_vtag = ntohl(init_chk->init.initiate_tag);
5816         /* who are we */
5817         memcpy(stc.identification, SCTP_VERSION_STRING,
5818             min(strlen(SCTP_VERSION_STRING), sizeof(stc.identification)));
5819         memset(stc.reserved, 0, SCTP_RESERVE_SPACE);
5820         /* now the chunk header */
5821         initack->ch.chunk_type = SCTP_INITIATION_ACK;
5822         initack->ch.chunk_flags = 0;
5823         /* fill in later from mbuf we build */
5824         initack->ch.chunk_length = 0;
5825         /* place in my tag */
5826         if ((asoc != NULL) &&
5827             ((SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_WAIT) ||
5828             (SCTP_GET_STATE(stcb) == SCTP_STATE_INUSE) ||
5829             (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED))) {
5830                 /* re-use the v-tags and init-seq here */
5831                 initack->init.initiate_tag = htonl(asoc->my_vtag);
5832                 initack->init.initial_tsn = htonl(asoc->init_seq_number);
5833         } else {
5834                 uint32_t vtag, itsn;
5835
5836                 if (asoc) {
5837                         atomic_add_int(&asoc->refcnt, 1);
5838                         SCTP_TCB_UNLOCK(stcb);
5839         new_tag:
5840                         SCTP_INP_INFO_RLOCK();
5841                         vtag = sctp_select_a_tag(inp, inp->sctp_lport, sh->src_port, 1);
5842                         SCTP_INP_INFO_RUNLOCK();
5843                         if ((asoc->peer_supports_nat) && (vtag == asoc->my_vtag)) {
5844                                 /*
5845                                  * Got a duplicate vtag on some guy behind a
5846                                  * nat make sure we don't use it.
5847                                  */
5848                                 goto new_tag;
5849                         }
5850                         initack->init.initiate_tag = htonl(vtag);
5851                         /* get a TSN to use too */
5852                         itsn = sctp_select_initial_TSN(&inp->sctp_ep);
5853                         initack->init.initial_tsn = htonl(itsn);
5854                         SCTP_TCB_LOCK(stcb);
5855                         atomic_subtract_int(&asoc->refcnt, 1);
5856                 } else {
5857                         SCTP_INP_INCR_REF(inp);
5858                         SCTP_INP_RUNLOCK(inp);
5859                         SCTP_INP_INFO_RLOCK();
5860                         vtag = sctp_select_a_tag(inp, inp->sctp_lport, sh->src_port, 1);
5861                         SCTP_INP_INFO_RUNLOCK();
5862                         initack->init.initiate_tag = htonl(vtag);
5863                         /* get a TSN to use too */
5864                         initack->init.initial_tsn = htonl(sctp_select_initial_TSN(&inp->sctp_ep));
5865                         SCTP_INP_RLOCK(inp);
5866                         SCTP_INP_DECR_REF(inp);
5867                 }
5868         }
5869         /* save away my tag to */
5870         stc.my_vtag = initack->init.initiate_tag;
5871
5872         /* set up some of the credits. */
5873         so = inp->sctp_socket;
5874         if (so == NULL) {
5875                 /* memory problem */
5876                 sctp_m_freem(op_err);
5877                 sctp_m_freem(m);
5878                 return;
5879         } else {
5880                 initack->init.a_rwnd = htonl(max(SCTP_SB_LIMIT_RCV(so), SCTP_MINIMAL_RWND));
5881         }
5882         /* set what I want */
5883         his_limit = ntohs(init_chk->init.num_inbound_streams);
5884         /* choose what I want */
5885         if (asoc != NULL) {
5886                 if (asoc->streamoutcnt > asoc->pre_open_streams) {
5887                         i_want = asoc->streamoutcnt;
5888                 } else {
5889                         i_want = asoc->pre_open_streams;
5890                 }
5891         } else {
5892                 i_want = inp->sctp_ep.pre_open_stream_count;
5893         }
5894         if (his_limit < i_want) {
5895                 /* I Want more :< */
5896                 initack->init.num_outbound_streams = init_chk->init.num_inbound_streams;
5897         } else {
5898                 /* I can have what I want :> */
5899                 initack->init.num_outbound_streams = htons(i_want);
5900         }
5901         /* tell him his limit. */
5902         initack->init.num_inbound_streams =
5903             htons(inp->sctp_ep.max_open_streams_intome);
5904
5905         /* adaptation layer indication parameter */
5906         if (inp->sctp_ep.adaptation_layer_indicator_provided) {
5907                 parameter_len = (uint16_t)sizeof(struct sctp_adaptation_layer_indication);
5908                 ali = (struct sctp_adaptation_layer_indication *)(mtod(m, caddr_t)+chunk_len);
5909                 ali->ph.param_type = htons(SCTP_ULP_ADAPTATION);
5910                 ali->ph.param_length = htons(parameter_len);
5911                 ali->indication = htonl(inp->sctp_ep.adaptation_layer_indicator);
5912                 chunk_len += parameter_len;
5913         }
5914
5915         /* ECN parameter */
5916         if (((asoc != NULL) && (asoc->ecn_supported == 1)) ||
5917             ((asoc == NULL) && (inp->ecn_supported == 1))) {
5918                 parameter_len = (uint16_t)sizeof(struct sctp_paramhdr);
5919                 ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
5920                 ph->param_type = htons(SCTP_ECN_CAPABLE);
5921                 ph->param_length = htons(parameter_len);
5922                 chunk_len += parameter_len;
5923         }
5924
5925         /* PR-SCTP supported parameter */
5926         if (((asoc != NULL) && (asoc->prsctp_supported == 1)) ||
5927             ((asoc == NULL) && (inp->prsctp_supported == 1))) {
5928                 parameter_len = (uint16_t)sizeof(struct sctp_paramhdr);
5929                 ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
5930                 ph->param_type = htons(SCTP_PRSCTP_SUPPORTED);
5931                 ph->param_length = htons(parameter_len);
5932                 chunk_len += parameter_len;
5933         }
5934
5935         /* Zero checksum acceptable parameter */
5936         if (((asoc != NULL) && (asoc->rcv_edmid != SCTP_EDMID_NONE)) ||
5937             ((asoc == NULL) && (inp->rcv_edmid != SCTP_EDMID_NONE))) {
5938                 parameter_len = (uint16_t)sizeof(struct sctp_zero_checksum_acceptable);
5939                 zero_chksum = (struct sctp_zero_checksum_acceptable *)(mtod(m, caddr_t)+chunk_len);
5940                 zero_chksum->ph.param_type = htons(SCTP_ZERO_CHECKSUM_ACCEPTABLE);
5941                 zero_chksum->ph.param_length = htons(parameter_len);
5942                 if (asoc != NULL) {
5943                         zero_chksum->edmid = htonl(asoc->rcv_edmid);
5944                 } else {
5945                         zero_chksum->edmid = htonl(inp->rcv_edmid);
5946                 }
5947                 chunk_len += parameter_len;
5948         }
5949
5950         /* Add NAT friendly parameter */
5951         if (nat_friendly) {
5952                 parameter_len = (uint16_t)sizeof(struct sctp_paramhdr);
5953                 ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
5954                 ph->param_type = htons(SCTP_HAS_NAT_SUPPORT);
5955                 ph->param_length = htons(parameter_len);
5956                 chunk_len += parameter_len;
5957         }
5958
5959         /* And now tell the peer which extensions we support */
5960         num_ext = 0;
5961         pr_supported = (struct sctp_supported_chunk_types_param *)(mtod(m, caddr_t)+chunk_len);
5962         if (((asoc != NULL) && (asoc->prsctp_supported == 1)) ||
5963             ((asoc == NULL) && (inp->prsctp_supported == 1))) {
5964                 pr_supported->chunk_types[num_ext++] = SCTP_FORWARD_CUM_TSN;
5965                 if (((asoc != NULL) && (asoc->idata_supported == 1)) ||
5966                     ((asoc == NULL) && (inp->idata_supported == 1))) {
5967                         pr_supported->chunk_types[num_ext++] = SCTP_IFORWARD_CUM_TSN;
5968                 }
5969         }
5970         if (((asoc != NULL) && (asoc->auth_supported == 1)) ||
5971             ((asoc == NULL) && (inp->auth_supported == 1))) {
5972                 pr_supported->chunk_types[num_ext++] = SCTP_AUTHENTICATION;
5973         }
5974         if (((asoc != NULL) && (asoc->asconf_supported == 1)) ||
5975             ((asoc == NULL) && (inp->asconf_supported == 1))) {
5976                 pr_supported->chunk_types[num_ext++] = SCTP_ASCONF;
5977                 pr_supported->chunk_types[num_ext++] = SCTP_ASCONF_ACK;
5978         }
5979         if (((asoc != NULL) && (asoc->reconfig_supported == 1)) ||
5980             ((asoc == NULL) && (inp->reconfig_supported == 1))) {
5981                 pr_supported->chunk_types[num_ext++] = SCTP_STREAM_RESET;
5982         }
5983         if (((asoc != NULL) && (asoc->idata_supported == 1)) ||
5984             ((asoc == NULL) && (inp->idata_supported == 1))) {
5985                 pr_supported->chunk_types[num_ext++] = SCTP_IDATA;
5986         }
5987         if (((asoc != NULL) && (asoc->nrsack_supported == 1)) ||
5988             ((asoc == NULL) && (inp->nrsack_supported == 1))) {
5989                 pr_supported->chunk_types[num_ext++] = SCTP_NR_SELECTIVE_ACK;
5990         }
5991         if (((asoc != NULL) && (asoc->pktdrop_supported == 1)) ||
5992             ((asoc == NULL) && (inp->pktdrop_supported == 1))) {
5993                 pr_supported->chunk_types[num_ext++] = SCTP_PACKET_DROPPED;
5994         }
5995         if (num_ext > 0) {
5996                 parameter_len = (uint16_t)sizeof(struct sctp_supported_chunk_types_param) + num_ext;
5997                 pr_supported->ph.param_type = htons(SCTP_SUPPORTED_CHUNK_EXT);
5998                 pr_supported->ph.param_length = htons(parameter_len);
5999                 padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
6000                 chunk_len += parameter_len;
6001         }
6002
6003         /* add authentication parameters */
6004         if (((asoc != NULL) && (asoc->auth_supported == 1)) ||
6005             ((asoc == NULL) && (inp->auth_supported == 1))) {
6006                 struct sctp_auth_random *randp;
6007                 struct sctp_auth_hmac_algo *hmacs;
6008                 struct sctp_auth_chunk_list *chunks;
6009
6010                 if (padding_len > 0) {
6011                         memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
6012                         chunk_len += padding_len;
6013                         padding_len = 0;
6014                 }
6015                 /* generate and add RANDOM parameter */
6016                 randp = (struct sctp_auth_random *)(mtod(m, caddr_t)+chunk_len);
6017                 parameter_len = (uint16_t)sizeof(struct sctp_auth_random) +
6018                     SCTP_AUTH_RANDOM_SIZE_DEFAULT;
6019                 randp->ph.param_type = htons(SCTP_RANDOM);
6020                 randp->ph.param_length = htons(parameter_len);
6021                 SCTP_READ_RANDOM(randp->random_data, SCTP_AUTH_RANDOM_SIZE_DEFAULT);
6022                 padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
6023                 chunk_len += parameter_len;
6024
6025                 if (padding_len > 0) {
6026                         memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
6027                         chunk_len += padding_len;
6028                         padding_len = 0;
6029                 }
6030                 /* add HMAC_ALGO parameter */
6031                 hmacs = (struct sctp_auth_hmac_algo *)(mtod(m, caddr_t)+chunk_len);
6032                 parameter_len = (uint16_t)sizeof(struct sctp_auth_hmac_algo) +
6033                     sctp_serialize_hmaclist(inp->sctp_ep.local_hmacs,
6034                     (uint8_t *)hmacs->hmac_ids);
6035                 hmacs->ph.param_type = htons(SCTP_HMAC_LIST);
6036                 hmacs->ph.param_length = htons(parameter_len);
6037                 padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
6038                 chunk_len += parameter_len;
6039
6040                 if (padding_len > 0) {
6041                         memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
6042                         chunk_len += padding_len;
6043                         padding_len = 0;
6044                 }
6045                 /* add CHUNKS parameter */
6046                 chunks = (struct sctp_auth_chunk_list *)(mtod(m, caddr_t)+chunk_len);
6047                 parameter_len = (uint16_t)sizeof(struct sctp_auth_chunk_list) +
6048                     sctp_serialize_auth_chunks(inp->sctp_ep.local_auth_chunks,
6049                     chunks->chunk_types);
6050                 chunks->ph.param_type = htons(SCTP_CHUNK_LIST);
6051                 chunks->ph.param_length = htons(parameter_len);
6052                 padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
6053                 chunk_len += parameter_len;
6054         }
6055         SCTP_BUF_LEN(m) = chunk_len;
6056         m_last = m;
6057         /* now the addresses */
6058         /*
6059          * To optimize this we could put the scoping stuff into a structure
6060          * and remove the individual uint8's from the stc structure. Then we
6061          * could just sifa in the address within the stc.. but for now this
6062          * is a quick hack to get the address stuff teased apart.
6063          */
6064         scp.ipv4_addr_legal = stc.ipv4_addr_legal;
6065         scp.ipv6_addr_legal = stc.ipv6_addr_legal;
6066         scp.loopback_scope = stc.loopback_scope;
6067         scp.ipv4_local_scope = stc.ipv4_scope;
6068         scp.local_scope = stc.local_scope;
6069         scp.site_scope = stc.site_scope;
6070         m_last = sctp_add_addresses_to_i_ia(inp, stcb, &scp, m_last,
6071             cnt_inits_to,
6072             &padding_len, &chunk_len);
6073         /* padding_len can only be positive, if no addresses have been added */
6074         if (padding_len > 0) {
6075                 memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
6076                 chunk_len += padding_len;
6077                 SCTP_BUF_LEN(m) += padding_len;
6078                 padding_len = 0;
6079         }
6080
6081         /* tack on the operational error if present */
6082         if (op_err) {
6083                 parameter_len = 0;
6084                 for (m_tmp = op_err; m_tmp != NULL; m_tmp = SCTP_BUF_NEXT(m_tmp)) {
6085                         parameter_len += SCTP_BUF_LEN(m_tmp);
6086                 }
6087                 padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
6088                 SCTP_BUF_NEXT(m_last) = op_err;
6089                 while (SCTP_BUF_NEXT(m_last) != NULL) {
6090                         m_last = SCTP_BUF_NEXT(m_last);
6091                 }
6092                 chunk_len += parameter_len;
6093         }
6094         if (padding_len > 0) {
6095                 m_last = sctp_add_pad_tombuf(m_last, padding_len);
6096                 if (m_last == NULL) {
6097                         /* Houston we have a problem, no space */
6098                         sctp_m_freem(m);
6099                         return;
6100                 }
6101                 chunk_len += padding_len;
6102                 padding_len = 0;
6103         }
6104         /* Now we must build a cookie */
6105         m_cookie = sctp_add_cookie(init_pkt, offset, m, 0, &stc, &signature);
6106         if (m_cookie == NULL) {
6107                 /* memory problem */
6108                 sctp_m_freem(m);
6109                 return;
6110         }
6111         /* Now append the cookie to the end and update the space/size */
6112         SCTP_BUF_NEXT(m_last) = m_cookie;
6113         parameter_len = 0;
6114         for (m_tmp = m_cookie; m_tmp != NULL; m_tmp = SCTP_BUF_NEXT(m_tmp)) {
6115                 parameter_len += SCTP_BUF_LEN(m_tmp);
6116                 if (SCTP_BUF_NEXT(m_tmp) == NULL) {
6117                         m_last = m_tmp;
6118                 }
6119         }
6120         padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
6121         chunk_len += parameter_len;
6122
6123         /*
6124          * Place in the size, but we don't include the last pad (if any) in
6125          * the INIT-ACK.
6126          */
6127         initack->ch.chunk_length = htons(chunk_len);
6128
6129         /*
6130          * Time to sign the cookie, we don't sign over the cookie signature
6131          * though thus we set trailer.
6132          */
6133         (void)sctp_hmac_m(SCTP_HMAC,
6134             (uint8_t *)inp->sctp_ep.secret_key[(int)(inp->sctp_ep.current_secret_number)],
6135             SCTP_SECRET_SIZE, m_cookie, sizeof(struct sctp_paramhdr),
6136             (uint8_t *)signature, SCTP_SIGNATURE_SIZE);
6137         /*
6138          * We sifa 0 here to NOT set IP_DF if its IPv4, we ignore the return
6139          * here since the timer will drive a retranmission.
6140          */
6141         if (padding_len > 0) {
6142                 if (sctp_add_pad_tombuf(m_last, padding_len) == NULL) {
6143                         sctp_m_freem(m);
6144                         return;
6145                 }
6146         }
6147         if (stc.loopback_scope) {
6148                 over_addr = (union sctp_sockstore *)dst;
6149         } else {
6150                 over_addr = NULL;
6151         }
6152
6153         if ((error = sctp_lowlevel_chunk_output(inp, NULL, NULL, to, m, 0, NULL, 0, 0,
6154             0, 0,
6155             inp->sctp_lport, sh->src_port, init_chk->init.initiate_tag,
6156             port, over_addr,
6157             mflowtype, mflowid,
6158             false,              /* XXXMT: Improve this! */
6159             SCTP_SO_NOT_LOCKED))) {
6160                 SCTPDBG(SCTP_DEBUG_OUTPUT4, "Gak send error %d\n", error);
6161                 if (error == ENOBUFS) {
6162                         if (asoc != NULL) {
6163                                 asoc->ifp_had_enobuf = 1;
6164                         }
6165                         SCTP_STAT_INCR(sctps_lowlevelerr);
6166                 }
6167         } else {
6168                 if (asoc != NULL) {
6169                         asoc->ifp_had_enobuf = 0;
6170                 }
6171         }
6172         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
6173 }
6174
6175 static void
6176 sctp_prune_prsctp(struct sctp_tcb *stcb,
6177     struct sctp_association *asoc,
6178     struct sctp_nonpad_sndrcvinfo *srcv,
6179     int dataout)
6180 {
6181         int freed_spc = 0;
6182         struct sctp_tmit_chunk *chk, *nchk;
6183
6184         SCTP_TCB_LOCK_ASSERT(stcb);
6185         if ((asoc->prsctp_supported) &&
6186             (asoc->sent_queue_cnt_removeable > 0)) {
6187                 TAILQ_FOREACH(chk, &asoc->sent_queue, sctp_next) {
6188                         /*
6189                          * Look for chunks marked with the PR_SCTP flag AND
6190                          * the buffer space flag. If the one being sent is
6191                          * equal or greater priority then purge the old one
6192                          * and free some space.
6193                          */
6194                         if (PR_SCTP_BUF_ENABLED(chk->flags)) {
6195                                 /*
6196                                  * This one is PR-SCTP AND buffer space
6197                                  * limited type
6198                                  */
6199                                 if (chk->rec.data.timetodrop.tv_sec > (long)srcv->sinfo_timetolive) {
6200                                         /*
6201                                          * Lower numbers equates to higher
6202                                          * priority. So if the one we are
6203                                          * looking at has a larger priority,
6204                                          * we want to drop the data and NOT
6205                                          * retransmit it.
6206                                          */
6207                                         if (chk->data) {
6208                                                 /*
6209                                                  * We release the book_size
6210                                                  * if the mbuf is here
6211                                                  */
6212                                                 int ret_spc;
6213                                                 uint8_t sent;
6214
6215                                                 if (chk->sent > SCTP_DATAGRAM_UNSENT)
6216                                                         sent = 1;
6217                                                 else
6218                                                         sent = 0;
6219                                                 ret_spc = sctp_release_pr_sctp_chunk(stcb, chk,
6220                                                     sent,
6221                                                     SCTP_SO_LOCKED);
6222                                                 freed_spc += ret_spc;
6223                                                 if (freed_spc >= dataout) {
6224                                                         return;
6225                                                 }
6226                                         }       /* if chunk was present */
6227                                 }       /* if of sufficient priority */
6228                         }       /* if chunk has enabled */
6229                 }               /* tailqforeach */
6230
6231                 TAILQ_FOREACH_SAFE(chk, &asoc->send_queue, sctp_next, nchk) {
6232                         /* Here we must move to the sent queue and mark */
6233                         if (PR_SCTP_BUF_ENABLED(chk->flags)) {
6234                                 if (chk->rec.data.timetodrop.tv_sec > (long)srcv->sinfo_timetolive) {
6235                                         if (chk->data) {
6236                                                 /*
6237                                                  * We release the book_size
6238                                                  * if the mbuf is here
6239                                                  */
6240                                                 int ret_spc;
6241
6242                                                 ret_spc = sctp_release_pr_sctp_chunk(stcb, chk,
6243                                                     0, SCTP_SO_LOCKED);
6244
6245                                                 freed_spc += ret_spc;
6246                                                 if (freed_spc >= dataout) {
6247                                                         return;
6248                                                 }
6249                                         }       /* end if chk->data */
6250                                 }       /* end if right class */
6251                         }       /* end if chk pr-sctp */
6252                 }               /* tailqforeachsafe (chk) */
6253         }                       /* if enabled in asoc */
6254 }
6255
6256 uint32_t
6257 sctp_get_frag_point(struct sctp_tcb *stcb)
6258 {
6259         struct sctp_association *asoc;
6260         uint32_t frag_point, overhead;
6261
6262         asoc = &stcb->asoc;
6263         /* Consider IP header and SCTP common header. */
6264         if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
6265                 overhead = SCTP_MIN_OVERHEAD;
6266         } else {
6267                 overhead = SCTP_MIN_V4_OVERHEAD;
6268         }
6269         /* Consider DATA/IDATA chunk header and AUTH header, if needed. */
6270         if (asoc->idata_supported) {
6271                 overhead += sizeof(struct sctp_idata_chunk);
6272                 if (sctp_auth_is_required_chunk(SCTP_IDATA, asoc->peer_auth_chunks)) {
6273                         overhead += sctp_get_auth_chunk_len(asoc->peer_hmac_id);
6274                 }
6275         } else {
6276                 overhead += sizeof(struct sctp_data_chunk);
6277                 if (sctp_auth_is_required_chunk(SCTP_DATA, asoc->peer_auth_chunks)) {
6278                         overhead += sctp_get_auth_chunk_len(asoc->peer_hmac_id);
6279                 }
6280         }
6281         KASSERT(overhead % 4 == 0,
6282             ("overhead (%u) not a multiple of 4", overhead));
6283         /* Consider padding. */
6284         if (asoc->smallest_mtu % 4 > 0) {
6285                 overhead += (asoc->smallest_mtu % 4);
6286         }
6287         KASSERT(asoc->smallest_mtu > overhead,
6288             ("Association MTU (%u) too small for overhead (%u)",
6289             asoc->smallest_mtu, overhead));
6290         frag_point = asoc->smallest_mtu - overhead;
6291         KASSERT(frag_point % 4 == 0,
6292             ("frag_point (%u) not a multiple of 4", frag_point));
6293         /* Honor MAXSEG socket option. */
6294         if ((asoc->sctp_frag_point > 0) &&
6295             (asoc->sctp_frag_point < frag_point)) {
6296                 frag_point = asoc->sctp_frag_point;
6297         }
6298         return (frag_point);
6299 }
6300
6301 static void
6302 sctp_set_prsctp_policy(struct sctp_stream_queue_pending *sp)
6303 {
6304         /*
6305          * We assume that the user wants PR_SCTP_TTL if the user provides a
6306          * positive lifetime but does not specify any PR_SCTP policy.
6307          */
6308         if (PR_SCTP_ENABLED(sp->sinfo_flags)) {
6309                 sp->act_flags |= PR_SCTP_POLICY(sp->sinfo_flags);
6310         } else if (sp->timetolive > 0) {
6311                 sp->sinfo_flags |= SCTP_PR_SCTP_TTL;
6312                 sp->act_flags |= PR_SCTP_POLICY(sp->sinfo_flags);
6313         } else {
6314                 return;
6315         }
6316         switch (PR_SCTP_POLICY(sp->sinfo_flags)) {
6317         case CHUNK_FLAGS_PR_SCTP_BUF:
6318                 /*
6319                  * Time to live is a priority stored in tv_sec when doing
6320                  * the buffer drop thing.
6321                  */
6322                 sp->ts.tv_sec = sp->timetolive;
6323                 sp->ts.tv_usec = 0;
6324                 break;
6325         case CHUNK_FLAGS_PR_SCTP_TTL:
6326                 {
6327                         struct timeval tv;
6328
6329                         (void)SCTP_GETTIME_TIMEVAL(&sp->ts);
6330                         tv.tv_sec = sp->timetolive / 1000;
6331                         tv.tv_usec = (sp->timetolive * 1000) % 1000000;
6332                         /*
6333                          * TODO sctp_constants.h needs alternative time
6334                          * macros when _KERNEL is undefined.
6335                          */
6336                         timevaladd(&sp->ts, &tv);
6337                 }
6338                 break;
6339         case CHUNK_FLAGS_PR_SCTP_RTX:
6340                 /*
6341                  * Time to live is a the number or retransmissions stored in
6342                  * tv_sec.
6343                  */
6344                 sp->ts.tv_sec = sp->timetolive;
6345                 sp->ts.tv_usec = 0;
6346                 break;
6347         default:
6348                 SCTPDBG(SCTP_DEBUG_USRREQ1,
6349                     "Unknown PR_SCTP policy %u.\n",
6350                     PR_SCTP_POLICY(sp->sinfo_flags));
6351                 break;
6352         }
6353 }
6354
6355 static int
6356 sctp_msg_append(struct sctp_tcb *stcb,
6357     struct sctp_nets *net,
6358     struct mbuf *m,
6359     struct sctp_nonpad_sndrcvinfo *srcv)
6360 {
6361         int error = 0;
6362         struct mbuf *at;
6363         struct sctp_stream_queue_pending *sp = NULL;
6364         struct sctp_stream_out *strm;
6365
6366         SCTP_TCB_LOCK_ASSERT(stcb);
6367
6368         /*
6369          * Given an mbuf chain, put it into the association send queue and
6370          * place it on the wheel
6371          */
6372         if (srcv->sinfo_stream >= stcb->asoc.streamoutcnt) {
6373                 /* Invalid stream number */
6374                 SCTP_LTRACE_ERR_RET_PKT(m, NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
6375                 error = EINVAL;
6376                 goto out_now;
6377         }
6378         if ((stcb->asoc.stream_locked) &&
6379             (stcb->asoc.stream_locked_on != srcv->sinfo_stream)) {
6380                 SCTP_LTRACE_ERR_RET_PKT(m, NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
6381                 error = EINVAL;
6382                 goto out_now;
6383         }
6384         if ((stcb->asoc.strmout[srcv->sinfo_stream].state != SCTP_STREAM_OPEN) &&
6385             (stcb->asoc.strmout[srcv->sinfo_stream].state != SCTP_STREAM_OPENING)) {
6386                 /*
6387                  * Can't queue any data while stream reset is underway.
6388                  */
6389                 if (stcb->asoc.strmout[srcv->sinfo_stream].state > SCTP_STREAM_OPEN) {
6390                         error = EAGAIN;
6391                 } else {
6392                         error = EINVAL;
6393                 }
6394                 goto out_now;
6395         }
6396         /* Now can we send this? */
6397         if ((SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_SENT) ||
6398             (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_ACK_SENT) ||
6399             (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_RECEIVED) ||
6400             (stcb->asoc.state & SCTP_STATE_SHUTDOWN_PENDING)) {
6401                 /* got data while shutting down */
6402                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EPIPE);
6403                 error = EPIPE;
6404                 goto out_now;
6405         }
6406         sctp_alloc_a_strmoq(stcb, sp);
6407         if (sp == NULL) {
6408                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
6409                 error = ENOMEM;
6410                 goto out_now;
6411         }
6412         sp->sinfo_flags = srcv->sinfo_flags;
6413         sp->timetolive = srcv->sinfo_timetolive;
6414         sp->ppid = srcv->sinfo_ppid;
6415         sp->context = srcv->sinfo_context;
6416         sp->fsn = 0;
6417         if (sp->sinfo_flags & SCTP_ADDR_OVER) {
6418                 sp->net = net;
6419                 atomic_add_int(&sp->net->ref_count, 1);
6420         } else {
6421                 sp->net = NULL;
6422         }
6423         (void)SCTP_GETTIME_TIMEVAL(&sp->ts);
6424         sp->sid = srcv->sinfo_stream;
6425         sp->msg_is_complete = 1;
6426         sp->sender_all_done = 1;
6427         sp->some_taken = 0;
6428         sp->data = m;
6429         sp->tail_mbuf = NULL;
6430         sctp_set_prsctp_policy(sp);
6431         /*
6432          * We could in theory (for sendall) sifa the length in, but we would
6433          * still have to hunt through the chain since we need to setup the
6434          * tail_mbuf
6435          */
6436         sp->length = 0;
6437         for (at = m; at; at = SCTP_BUF_NEXT(at)) {
6438                 if (SCTP_BUF_NEXT(at) == NULL)
6439                         sp->tail_mbuf = at;
6440                 sp->length += SCTP_BUF_LEN(at);
6441         }
6442         if (srcv->sinfo_keynumber_valid) {
6443                 sp->auth_keyid = srcv->sinfo_keynumber;
6444         } else {
6445                 sp->auth_keyid = stcb->asoc.authinfo.active_keyid;
6446         }
6447         if (sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks)) {
6448                 sctp_auth_key_acquire(stcb, sp->auth_keyid);
6449                 sp->holds_key_ref = 1;
6450         }
6451         strm = &stcb->asoc.strmout[srcv->sinfo_stream];
6452         sctp_snd_sb_alloc(stcb, sp->length);
6453         atomic_add_int(&stcb->asoc.stream_queue_cnt, 1);
6454         TAILQ_INSERT_TAIL(&strm->outqueue, sp, next);
6455         stcb->asoc.ss_functions.sctp_ss_add_to_stream(stcb, &stcb->asoc, strm, sp);
6456         m = NULL;
6457 out_now:
6458         if (m) {
6459                 sctp_m_freem(m);
6460         }
6461         return (error);
6462 }
6463
6464 static struct mbuf *
6465 sctp_copy_mbufchain(struct mbuf *clonechain,
6466     struct mbuf *outchain,
6467     struct mbuf **endofchain,
6468     int can_take_mbuf,
6469     int sizeofcpy,
6470     uint8_t copy_by_ref)
6471 {
6472         struct mbuf *m;
6473         struct mbuf *appendchain;
6474         caddr_t cp;
6475         int len;
6476
6477         if (endofchain == NULL) {
6478                 /* error */
6479 error_out:
6480                 if (outchain)
6481                         sctp_m_freem(outchain);
6482                 return (NULL);
6483         }
6484         if (can_take_mbuf) {
6485                 appendchain = clonechain;
6486         } else {
6487                 if (!copy_by_ref &&
6488                     (sizeofcpy <= (int)((((SCTP_BASE_SYSCTL(sctp_mbuf_threshold_count) - 1) * MLEN) + MHLEN)))) {
6489                         /* Its not in a cluster */
6490                         if (*endofchain == NULL) {
6491                                 /* lets get a mbuf cluster */
6492                                 if (outchain == NULL) {
6493                                         /* This is the general case */
6494                         new_mbuf:
6495                                         outchain = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_HEADER);
6496                                         if (outchain == NULL) {
6497                                                 goto error_out;
6498                                         }
6499                                         SCTP_BUF_LEN(outchain) = 0;
6500                                         *endofchain = outchain;
6501                                         /* get the prepend space */
6502                                         SCTP_BUF_RESV_UF(outchain, (SCTP_FIRST_MBUF_RESV + 4));
6503                                 } else {
6504                                         /*
6505                                          * We really should not get a NULL
6506                                          * in endofchain
6507                                          */
6508                                         /* find end */
6509                                         m = outchain;
6510                                         while (m) {
6511                                                 if (SCTP_BUF_NEXT(m) == NULL) {
6512                                                         *endofchain = m;
6513                                                         break;
6514                                                 }
6515                                                 m = SCTP_BUF_NEXT(m);
6516                                         }
6517                                         /* sanity */
6518                                         if (*endofchain == NULL) {
6519                                                 /*
6520                                                  * huh, TSNH XXX maybe we
6521                                                  * should panic
6522                                                  */
6523                                                 sctp_m_freem(outchain);
6524                                                 goto new_mbuf;
6525                                         }
6526                                 }
6527                                 /* get the new end of length */
6528                                 len = (int)M_TRAILINGSPACE(*endofchain);
6529                         } else {
6530                                 /* how much is left at the end? */
6531                                 len = (int)M_TRAILINGSPACE(*endofchain);
6532                         }
6533                         /* Find the end of the data, for appending */
6534                         cp = (mtod((*endofchain), caddr_t)+SCTP_BUF_LEN((*endofchain)));
6535
6536                         /* Now lets copy it out */
6537                         if (len >= sizeofcpy) {
6538                                 /* It all fits, copy it in */
6539                                 m_copydata(clonechain, 0, sizeofcpy, cp);
6540                                 SCTP_BUF_LEN((*endofchain)) += sizeofcpy;
6541                         } else {
6542                                 /* fill up the end of the chain */
6543                                 if (len > 0) {
6544                                         m_copydata(clonechain, 0, len, cp);
6545                                         SCTP_BUF_LEN((*endofchain)) += len;
6546                                         /* now we need another one */
6547                                         sizeofcpy -= len;
6548                                 }
6549                                 m = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_HEADER);
6550                                 if (m == NULL) {
6551                                         /* We failed */
6552                                         goto error_out;
6553                                 }
6554                                 SCTP_BUF_NEXT((*endofchain)) = m;
6555                                 *endofchain = m;
6556                                 cp = mtod((*endofchain), caddr_t);
6557                                 m_copydata(clonechain, len, sizeofcpy, cp);
6558                                 SCTP_BUF_LEN((*endofchain)) += sizeofcpy;
6559                         }
6560                         return (outchain);
6561                 } else {
6562                         /* copy the old fashion way */
6563                         appendchain = SCTP_M_COPYM(clonechain, 0, M_COPYALL, M_NOWAIT);
6564 #ifdef SCTP_MBUF_LOGGING
6565                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
6566                                 sctp_log_mbc(appendchain, SCTP_MBUF_ICOPY);
6567                         }
6568 #endif
6569                 }
6570         }
6571         if (appendchain == NULL) {
6572                 /* error */
6573                 if (outchain)
6574                         sctp_m_freem(outchain);
6575                 return (NULL);
6576         }
6577         if (outchain) {
6578                 /* tack on to the end */
6579                 if (*endofchain != NULL) {
6580                         SCTP_BUF_NEXT(((*endofchain))) = appendchain;
6581                 } else {
6582                         m = outchain;
6583                         while (m) {
6584                                 if (SCTP_BUF_NEXT(m) == NULL) {
6585                                         SCTP_BUF_NEXT(m) = appendchain;
6586                                         break;
6587                                 }
6588                                 m = SCTP_BUF_NEXT(m);
6589                         }
6590                 }
6591                 /*
6592                  * save off the end and update the end-chain position
6593                  */
6594                 m = appendchain;
6595                 while (m) {
6596                         if (SCTP_BUF_NEXT(m) == NULL) {
6597                                 *endofchain = m;
6598                                 break;
6599                         }
6600                         m = SCTP_BUF_NEXT(m);
6601                 }
6602                 return (outchain);
6603         } else {
6604                 /* save off the end and update the end-chain position */
6605                 m = appendchain;
6606                 while (m) {
6607                         if (SCTP_BUF_NEXT(m) == NULL) {
6608                                 *endofchain = m;
6609                                 break;
6610                         }
6611                         m = SCTP_BUF_NEXT(m);
6612                 }
6613                 return (appendchain);
6614         }
6615 }
6616
6617 static int
6618 sctp_med_chunk_output(struct sctp_inpcb *inp,
6619     struct sctp_tcb *stcb,
6620     struct sctp_association *asoc,
6621     int *num_out,
6622     int *reason_code,
6623     int control_only, int from_where,
6624     struct timeval *now, int *now_filled,
6625     uint32_t frag_point, int so_locked);
6626
6627 static void
6628 sctp_sendall_iterator(struct sctp_inpcb *inp, struct sctp_tcb *stcb, void *ptr,
6629     uint32_t val SCTP_UNUSED)
6630 {
6631         struct sctp_copy_all *ca;
6632         struct mbuf *m;
6633         int ret = 0;
6634         int added_control = 0;
6635         int un_sent, do_chunk_output = 1;
6636         struct sctp_association *asoc;
6637         struct sctp_nets *net;
6638
6639         ca = (struct sctp_copy_all *)ptr;
6640         if (ca->m == NULL) {
6641                 return;
6642         }
6643         if (ca->inp != inp) {
6644                 /* TSNH */
6645                 return;
6646         }
6647         if (ca->sndlen > 0) {
6648                 m = SCTP_M_COPYM(ca->m, 0, M_COPYALL, M_NOWAIT);
6649                 if (m == NULL) {
6650                         /* can't copy so we are done */
6651                         ca->cnt_failed++;
6652                         return;
6653                 }
6654 #ifdef SCTP_MBUF_LOGGING
6655                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
6656                         sctp_log_mbc(m, SCTP_MBUF_ICOPY);
6657                 }
6658 #endif
6659         } else {
6660                 m = NULL;
6661         }
6662         SCTP_TCB_LOCK_ASSERT(stcb);
6663         if (stcb->asoc.alternate) {
6664                 net = stcb->asoc.alternate;
6665         } else {
6666                 net = stcb->asoc.primary_destination;
6667         }
6668         if (ca->sndrcv.sinfo_flags & SCTP_ABORT) {
6669                 /* Abort this assoc with m as the user defined reason */
6670                 if (m != NULL) {
6671                         SCTP_BUF_PREPEND(m, sizeof(struct sctp_paramhdr), M_NOWAIT);
6672                 } else {
6673                         m = sctp_get_mbuf_for_msg(sizeof(struct sctp_paramhdr),
6674                             0, M_NOWAIT, 1, MT_DATA);
6675                         SCTP_BUF_LEN(m) = sizeof(struct sctp_paramhdr);
6676                 }
6677                 if (m != NULL) {
6678                         struct sctp_paramhdr *ph;
6679
6680                         ph = mtod(m, struct sctp_paramhdr *);
6681                         ph->param_type = htons(SCTP_CAUSE_USER_INITIATED_ABT);
6682                         ph->param_length = htons((uint16_t)(sizeof(struct sctp_paramhdr) + ca->sndlen));
6683                 }
6684                 /*
6685                  * We add one here to keep the assoc from dis-appearing on
6686                  * us.
6687                  */
6688                 atomic_add_int(&stcb->asoc.refcnt, 1);
6689                 sctp_abort_an_association(inp, stcb, m, false, SCTP_SO_NOT_LOCKED);
6690                 /*
6691                  * sctp_abort_an_association calls sctp_free_asoc() free
6692                  * association will NOT free it since we incremented the
6693                  * refcnt .. we do this to prevent it being freed and things
6694                  * getting tricky since we could end up (from free_asoc)
6695                  * calling inpcb_free which would get a recursive lock call
6696                  * to the iterator lock.. But as a consequence of that the
6697                  * stcb will return to us un-locked.. since free_asoc
6698                  * returns with either no TCB or the TCB unlocked, we must
6699                  * relock.. to unlock in the iterator timer :-0
6700                  */
6701                 SCTP_TCB_LOCK(stcb);
6702                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
6703                 goto no_chunk_output;
6704         } else {
6705                 if (m != NULL) {
6706                         ret = sctp_msg_append(stcb, net, m, &ca->sndrcv);
6707                 }
6708                 asoc = &stcb->asoc;
6709                 if (ca->sndrcv.sinfo_flags & SCTP_EOF) {
6710                         /* shutdown this assoc */
6711                         if (TAILQ_EMPTY(&asoc->send_queue) &&
6712                             TAILQ_EMPTY(&asoc->sent_queue) &&
6713                             sctp_is_there_unsent_data(stcb, SCTP_SO_NOT_LOCKED) == 0) {
6714                                 if ((*asoc->ss_functions.sctp_ss_is_user_msgs_incomplete) (stcb, asoc)) {
6715                                         goto abort_anyway;
6716                                 }
6717                                 /*
6718                                  * there is nothing queued to send, so I'm
6719                                  * done...
6720                                  */
6721                                 if ((SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_SENT) &&
6722                                     (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
6723                                     (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
6724                                         /*
6725                                          * only send SHUTDOWN the first time
6726                                          * through
6727                                          */
6728                                         if (SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) {
6729                                                 SCTP_STAT_DECR_GAUGE32(sctps_currestab);
6730                                         }
6731                                         SCTP_SET_STATE(stcb, SCTP_STATE_SHUTDOWN_SENT);
6732                                         sctp_stop_timers_for_shutdown(stcb);
6733                                         sctp_send_shutdown(stcb, net);
6734                                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb,
6735                                             net);
6736                                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
6737                                             NULL);
6738                                         added_control = 1;
6739                                         do_chunk_output = 0;
6740                                 }
6741                         } else {
6742                                 /*
6743                                  * we still got (or just got) data to send,
6744                                  * so set SHUTDOWN_PENDING
6745                                  */
6746                                 /*
6747                                  * XXX sockets draft says that SCTP_EOF
6748                                  * should be sent with no data.  currently,
6749                                  * we will allow user data to be sent first
6750                                  * and move to SHUTDOWN-PENDING
6751                                  */
6752                                 if ((SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_SENT) &&
6753                                     (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
6754                                     (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
6755                                         if ((*asoc->ss_functions.sctp_ss_is_user_msgs_incomplete) (stcb, asoc)) {
6756                                                 SCTP_ADD_SUBSTATE(stcb, SCTP_STATE_PARTIAL_MSG_LEFT);
6757                                         }
6758                                         SCTP_ADD_SUBSTATE(stcb, SCTP_STATE_SHUTDOWN_PENDING);
6759                                         if (TAILQ_EMPTY(&asoc->send_queue) &&
6760                                             TAILQ_EMPTY(&asoc->sent_queue) &&
6761                                             (asoc->state & SCTP_STATE_PARTIAL_MSG_LEFT)) {
6762                                                 struct mbuf *op_err;
6763                                                 char msg[SCTP_DIAG_INFO_LEN];
6764
6765                                 abort_anyway:
6766                                                 SCTP_SNPRINTF(msg, sizeof(msg),
6767                                                     "%s:%d at %s", __FILE__, __LINE__, __func__);
6768                                                 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
6769                                                     msg);
6770                                                 atomic_add_int(&stcb->asoc.refcnt, 1);
6771                                                 sctp_abort_an_association(stcb->sctp_ep, stcb,
6772                                                     op_err, false, SCTP_SO_NOT_LOCKED);
6773                                                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
6774                                                 goto no_chunk_output;
6775                                         }
6776                                 }
6777                         }
6778                 }
6779         }
6780         un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
6781             (stcb->asoc.stream_queue_cnt * SCTP_DATA_CHUNK_OVERHEAD(stcb)));
6782
6783         if ((sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY)) &&
6784             (stcb->asoc.total_flight > 0) &&
6785             (un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD))) {
6786                 do_chunk_output = 0;
6787         }
6788         if (do_chunk_output)
6789                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_NOT_LOCKED);
6790         else if (added_control) {
6791                 struct timeval now;
6792                 int num_out, reason, now_filled = 0;
6793
6794                 (void)sctp_med_chunk_output(inp, stcb, &stcb->asoc, &num_out,
6795                     &reason, 1, 1, &now, &now_filled,
6796                     sctp_get_frag_point(stcb),
6797                     SCTP_SO_NOT_LOCKED);
6798         }
6799 no_chunk_output:
6800         if (ret) {
6801                 ca->cnt_failed++;
6802         } else {
6803                 ca->cnt_sent++;
6804         }
6805 }
6806
6807 static void
6808 sctp_sendall_completes(void *ptr, uint32_t val SCTP_UNUSED)
6809 {
6810         struct sctp_copy_all *ca;
6811
6812         ca = (struct sctp_copy_all *)ptr;
6813         /*
6814          * Do a notify here? Kacheong suggests that the notify be done at
6815          * the send time.. so you would push up a notification if any send
6816          * failed. Don't know if this is feasible since the only failures we
6817          * have is "memory" related and if you cannot get an mbuf to send
6818          * the data you surely can't get an mbuf to send up to notify the
6819          * user you can't send the data :->
6820          */
6821
6822         /* now free everything */
6823         if (ca->inp) {
6824                 /* Lets clear the flag to allow others to run. */
6825                 SCTP_INP_WLOCK(ca->inp);
6826                 ca->inp->sctp_flags &= ~SCTP_PCB_FLAGS_SND_ITERATOR_UP;
6827                 SCTP_INP_WUNLOCK(ca->inp);
6828         }
6829         sctp_m_freem(ca->m);
6830         SCTP_FREE(ca, SCTP_M_COPYAL);
6831 }
6832
6833 static struct mbuf *
6834 sctp_copy_out_all(struct uio *uio, ssize_t len)
6835 {
6836         struct mbuf *ret, *at;
6837         ssize_t left, willcpy, cancpy, error;
6838
6839         ret = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_WAITOK, 1, MT_DATA);
6840         if (ret == NULL) {
6841                 /* TSNH */
6842                 return (NULL);
6843         }
6844         left = len;
6845         SCTP_BUF_LEN(ret) = 0;
6846         /* save space for the data chunk header */
6847         cancpy = (int)M_TRAILINGSPACE(ret);
6848         willcpy = min(cancpy, left);
6849         at = ret;
6850         while (left > 0) {
6851                 /* Align data to the end */
6852                 error = uiomove(mtod(at, caddr_t), (int)willcpy, uio);
6853                 if (error) {
6854         err_out_now:
6855                         sctp_m_freem(at);
6856                         return (NULL);
6857                 }
6858                 SCTP_BUF_LEN(at) = (int)willcpy;
6859                 SCTP_BUF_NEXT_PKT(at) = SCTP_BUF_NEXT(at) = 0;
6860                 left -= willcpy;
6861                 if (left > 0) {
6862                         SCTP_BUF_NEXT(at) = sctp_get_mbuf_for_msg((unsigned int)left, 0, M_WAITOK, 1, MT_DATA);
6863                         if (SCTP_BUF_NEXT(at) == NULL) {
6864                                 goto err_out_now;
6865                         }
6866                         at = SCTP_BUF_NEXT(at);
6867                         SCTP_BUF_LEN(at) = 0;
6868                         cancpy = (int)M_TRAILINGSPACE(at);
6869                         willcpy = min(cancpy, left);
6870                 }
6871         }
6872         return (ret);
6873 }
6874
6875 static int
6876 sctp_sendall(struct sctp_inpcb *inp, struct uio *uio, struct mbuf *m,
6877     struct sctp_nonpad_sndrcvinfo *srcv)
6878 {
6879         int ret;
6880         struct sctp_copy_all *ca;
6881
6882         if (uio->uio_resid > (ssize_t)SCTP_BASE_SYSCTL(sctp_sendall_limit)) {
6883                 /* You must not be larger than the limit! */
6884                 return (EMSGSIZE);
6885         }
6886         SCTP_MALLOC(ca, struct sctp_copy_all *, sizeof(struct sctp_copy_all),
6887             SCTP_M_COPYAL);
6888         if (ca == NULL) {
6889                 sctp_m_freem(m);
6890                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
6891                 return (ENOMEM);
6892         }
6893         memset(ca, 0, sizeof(struct sctp_copy_all));
6894
6895         ca->inp = inp;
6896         if (srcv != NULL) {
6897                 memcpy(&ca->sndrcv, srcv, sizeof(struct sctp_nonpad_sndrcvinfo));
6898         }
6899
6900         /* Serialize. */
6901         SCTP_INP_WLOCK(inp);
6902         if ((inp->sctp_flags & SCTP_PCB_FLAGS_SND_ITERATOR_UP) != 0) {
6903                 SCTP_INP_WUNLOCK(inp);
6904                 sctp_m_freem(m);
6905                 SCTP_FREE(ca, SCTP_M_COPYAL);
6906                 return (EBUSY);
6907         }
6908         inp->sctp_flags |= SCTP_PCB_FLAGS_SND_ITERATOR_UP;
6909         SCTP_INP_WUNLOCK(inp);
6910
6911         /*
6912          * take off the sendall flag, it would be bad if we failed to do
6913          * this :-0
6914          */
6915         ca->sndrcv.sinfo_flags &= ~SCTP_SENDALL;
6916         /* get length and mbuf chain */
6917         if (uio) {
6918                 ca->sndlen = uio->uio_resid;
6919                 ca->m = sctp_copy_out_all(uio, ca->sndlen);
6920                 if (ca->m == NULL) {
6921                         SCTP_FREE(ca, SCTP_M_COPYAL);
6922                         sctp_m_freem(m);
6923                         SCTP_INP_WLOCK(inp);
6924                         inp->sctp_flags &= ~SCTP_PCB_FLAGS_SND_ITERATOR_UP;
6925                         SCTP_INP_WUNLOCK(inp);
6926                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
6927                         return (ENOMEM);
6928                 }
6929         } else {
6930                 /* Gather the length of the send */
6931                 struct mbuf *mat;
6932
6933                 ca->sndlen = 0;
6934                 for (mat = m; mat; mat = SCTP_BUF_NEXT(mat)) {
6935                         ca->sndlen += SCTP_BUF_LEN(mat);
6936                 }
6937         }
6938         ret = sctp_initiate_iterator(NULL, sctp_sendall_iterator, NULL,
6939             SCTP_PCB_ANY_FLAGS, SCTP_PCB_ANY_FEATURES,
6940             SCTP_ASOC_ANY_STATE,
6941             (void *)ca, 0,
6942             sctp_sendall_completes, inp, 1);
6943         if (ret) {
6944                 SCTP_INP_WLOCK(inp);
6945                 inp->sctp_flags &= ~SCTP_PCB_FLAGS_SND_ITERATOR_UP;
6946                 SCTP_INP_WUNLOCK(inp);
6947                 SCTP_FREE(ca, SCTP_M_COPYAL);
6948                 SCTP_LTRACE_ERR_RET_PKT(m, inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EFAULT);
6949                 return (EFAULT);
6950         }
6951         return (0);
6952 }
6953
6954 void
6955 sctp_toss_old_cookies(struct sctp_tcb *stcb, struct sctp_association *asoc)
6956 {
6957         struct sctp_tmit_chunk *chk, *nchk;
6958
6959         TAILQ_FOREACH_SAFE(chk, &asoc->control_send_queue, sctp_next, nchk) {
6960                 if (chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
6961                         TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
6962                         asoc->ctrl_queue_cnt--;
6963                         if (chk->data) {
6964                                 sctp_m_freem(chk->data);
6965                                 chk->data = NULL;
6966                         }
6967                         sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
6968                 }
6969         }
6970 }
6971
6972 void
6973 sctp_toss_old_asconf(struct sctp_tcb *stcb)
6974 {
6975         struct sctp_association *asoc;
6976         struct sctp_tmit_chunk *chk, *nchk;
6977         struct sctp_asconf_chunk *acp;
6978
6979         asoc = &stcb->asoc;
6980         TAILQ_FOREACH_SAFE(chk, &asoc->asconf_send_queue, sctp_next, nchk) {
6981                 /* find SCTP_ASCONF chunk in queue */
6982                 if (chk->rec.chunk_id.id == SCTP_ASCONF) {
6983                         if (chk->data) {
6984                                 acp = mtod(chk->data, struct sctp_asconf_chunk *);
6985                                 if (SCTP_TSN_GT(ntohl(acp->serial_number), asoc->asconf_seq_out_acked)) {
6986                                         /* Not Acked yet */
6987                                         break;
6988                                 }
6989                         }
6990                         TAILQ_REMOVE(&asoc->asconf_send_queue, chk, sctp_next);
6991                         asoc->ctrl_queue_cnt--;
6992                         if (chk->data) {
6993                                 sctp_m_freem(chk->data);
6994                                 chk->data = NULL;
6995                         }
6996                         sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
6997                 }
6998         }
6999 }
7000
7001 static void
7002 sctp_clean_up_datalist(struct sctp_tcb *stcb,
7003     struct sctp_association *asoc,
7004     struct sctp_tmit_chunk **data_list,
7005     int bundle_at,
7006     struct sctp_nets *net)
7007 {
7008         int i;
7009         struct sctp_tmit_chunk *tp1;
7010
7011         for (i = 0; i < bundle_at; i++) {
7012                 /* off of the send queue */
7013                 TAILQ_REMOVE(&asoc->send_queue, data_list[i], sctp_next);
7014                 asoc->send_queue_cnt--;
7015                 if (i > 0) {
7016                         /*
7017                          * Any chunk NOT 0 you zap the time chunk 0 gets
7018                          * zapped or set based on if a RTO measurement is
7019                          * needed.
7020                          */
7021                         data_list[i]->do_rtt = 0;
7022                 }
7023                 /* record time */
7024                 data_list[i]->sent_rcv_time = net->last_sent_time;
7025                 data_list[i]->rec.data.cwnd_at_send = net->cwnd;
7026                 data_list[i]->rec.data.fast_retran_tsn = data_list[i]->rec.data.tsn;
7027                 if (data_list[i]->whoTo == NULL) {
7028                         data_list[i]->whoTo = net;
7029                         atomic_add_int(&net->ref_count, 1);
7030                 }
7031                 /* on to the sent queue */
7032                 tp1 = TAILQ_LAST(&asoc->sent_queue, sctpchunk_listhead);
7033                 if ((tp1) && SCTP_TSN_GT(tp1->rec.data.tsn, data_list[i]->rec.data.tsn)) {
7034                         struct sctp_tmit_chunk *tpp;
7035
7036                         /* need to move back */
7037         back_up_more:
7038                         tpp = TAILQ_PREV(tp1, sctpchunk_listhead, sctp_next);
7039                         if (tpp == NULL) {
7040                                 TAILQ_INSERT_BEFORE(tp1, data_list[i], sctp_next);
7041                                 goto all_done;
7042                         }
7043                         tp1 = tpp;
7044                         if (SCTP_TSN_GT(tp1->rec.data.tsn, data_list[i]->rec.data.tsn)) {
7045                                 goto back_up_more;
7046                         }
7047                         TAILQ_INSERT_AFTER(&asoc->sent_queue, tp1, data_list[i], sctp_next);
7048                 } else {
7049                         TAILQ_INSERT_TAIL(&asoc->sent_queue,
7050                             data_list[i],
7051                             sctp_next);
7052                 }
7053 all_done:
7054                 /* This does not lower until the cum-ack passes it */
7055                 asoc->sent_queue_cnt++;
7056                 if ((asoc->peers_rwnd <= 0) &&
7057                     (asoc->total_flight == 0) &&
7058                     (bundle_at == 1)) {
7059                         /* Mark the chunk as being a window probe */
7060                         SCTP_STAT_INCR(sctps_windowprobed);
7061                 }
7062 #ifdef SCTP_AUDITING_ENABLED
7063                 sctp_audit_log(0xC2, 3);
7064 #endif
7065                 data_list[i]->sent = SCTP_DATAGRAM_SENT;
7066                 data_list[i]->snd_count = 1;
7067                 data_list[i]->rec.data.chunk_was_revoked = 0;
7068                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
7069                         sctp_misc_ints(SCTP_FLIGHT_LOG_UP,
7070                             data_list[i]->whoTo->flight_size,
7071                             data_list[i]->book_size,
7072                             (uint32_t)(uintptr_t)data_list[i]->whoTo,
7073                             data_list[i]->rec.data.tsn);
7074                 }
7075                 sctp_flight_size_increase(data_list[i]);
7076                 sctp_total_flight_increase(stcb, data_list[i]);
7077                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_RWND_ENABLE) {
7078                         sctp_log_rwnd(SCTP_DECREASE_PEER_RWND,
7079                             asoc->peers_rwnd, data_list[i]->send_size, SCTP_BASE_SYSCTL(sctp_peer_chunk_oh));
7080                 }
7081                 asoc->peers_rwnd = sctp_sbspace_sub(asoc->peers_rwnd,
7082                     (uint32_t)(data_list[i]->send_size + SCTP_BASE_SYSCTL(sctp_peer_chunk_oh)));
7083                 if (asoc->peers_rwnd < stcb->sctp_ep->sctp_ep.sctp_sws_sender) {
7084                         /* SWS sender side engages */
7085                         asoc->peers_rwnd = 0;
7086                 }
7087         }
7088         if (asoc->cc_functions.sctp_cwnd_update_packet_transmitted) {
7089                 (*asoc->cc_functions.sctp_cwnd_update_packet_transmitted) (stcb, net);
7090         }
7091 }
7092
7093 static void
7094 sctp_clean_up_ctl(struct sctp_tcb *stcb, struct sctp_association *asoc, int so_locked)
7095 {
7096         struct sctp_tmit_chunk *chk, *nchk;
7097
7098         TAILQ_FOREACH_SAFE(chk, &asoc->control_send_queue, sctp_next, nchk) {
7099                 if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
7100                     (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK) ||  /* EY */
7101                     (chk->rec.chunk_id.id == SCTP_HEARTBEAT_REQUEST) ||
7102                     (chk->rec.chunk_id.id == SCTP_HEARTBEAT_ACK) ||
7103                     (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN) ||
7104                     (chk->rec.chunk_id.id == SCTP_SHUTDOWN) ||
7105                     (chk->rec.chunk_id.id == SCTP_SHUTDOWN_ACK) ||
7106                     (chk->rec.chunk_id.id == SCTP_OPERATION_ERROR) ||
7107                     (chk->rec.chunk_id.id == SCTP_PACKET_DROPPED) ||
7108                     (chk->rec.chunk_id.id == SCTP_COOKIE_ACK) ||
7109                     (chk->rec.chunk_id.id == SCTP_ECN_CWR) ||
7110                     (chk->rec.chunk_id.id == SCTP_ASCONF_ACK)) {
7111                         /* Stray chunks must be cleaned up */
7112         clean_up_anyway:
7113                         TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
7114                         asoc->ctrl_queue_cnt--;
7115                         if (chk->data) {
7116                                 sctp_m_freem(chk->data);
7117                                 chk->data = NULL;
7118                         }
7119                         if (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN) {
7120                                 asoc->fwd_tsn_cnt--;
7121                         }
7122                         sctp_free_a_chunk(stcb, chk, so_locked);
7123                 } else if (chk->rec.chunk_id.id == SCTP_STREAM_RESET) {
7124                         /* special handling, we must look into the param */
7125                         if (chk != asoc->str_reset) {
7126                                 goto clean_up_anyway;
7127                         }
7128                 }
7129         }
7130 }
7131
7132 static uint32_t
7133 sctp_can_we_split_this(struct sctp_tcb *stcb, uint32_t length,
7134     uint32_t space_left, uint32_t frag_point, int eeor_on)
7135 {
7136         /*
7137          * Make a decision on if I should split a msg into multiple parts.
7138          * This is only asked of incomplete messages.
7139          */
7140         if (eeor_on) {
7141                 /*
7142                  * If we are doing EEOR we need to always send it if its the
7143                  * entire thing, since it might be all the guy is putting in
7144                  * the hopper.
7145                  */
7146                 if (space_left >= length) {
7147                         /*-
7148                          * If we have data outstanding,
7149                          * we get another chance when the sack
7150                          * arrives to transmit - wait for more data
7151                          */
7152                         if (stcb->asoc.total_flight == 0) {
7153                                 /*
7154                                  * If nothing is in flight, we zero the
7155                                  * packet counter.
7156                                  */
7157                                 return (length);
7158                         }
7159                         return (0);
7160
7161                 } else {
7162                         /* You can fill the rest */
7163                         return (space_left);
7164                 }
7165         }
7166         /*-
7167          * For those strange folk that make the send buffer
7168          * smaller than our fragmentation point, we can't
7169          * get a full msg in so we have to allow splitting.
7170          */
7171         if (SCTP_SB_LIMIT_SND(stcb->sctp_socket) < frag_point) {
7172                 return (length);
7173         }
7174         if ((length <= space_left) ||
7175             ((length - space_left) < SCTP_BASE_SYSCTL(sctp_min_residual))) {
7176                 /* Sub-optimal residual don't split in non-eeor mode. */
7177                 return (0);
7178         }
7179         /*
7180          * If we reach here length is larger than the space_left. Do we wish
7181          * to split it for the sake of packet putting together?
7182          */
7183         if (space_left >= min(SCTP_BASE_SYSCTL(sctp_min_split_point), frag_point)) {
7184                 /* Its ok to split it */
7185                 return (min(space_left, frag_point));
7186         }
7187         /* Nope, can't split */
7188         return (0);
7189 }
7190
7191 static uint32_t
7192 sctp_move_to_outqueue(struct sctp_tcb *stcb,
7193     struct sctp_nets *net,
7194     struct sctp_stream_out *strq,
7195     uint32_t space_left,
7196     uint32_t frag_point,
7197     int *giveup,
7198     int eeor_mode,
7199     int *bail,
7200     int so_locked)
7201 {
7202         /* Move from the stream to the send_queue keeping track of the total */
7203         struct sctp_association *asoc;
7204         struct sctp_stream_queue_pending *sp;
7205         struct sctp_tmit_chunk *chk;
7206         struct sctp_data_chunk *dchkh = NULL;
7207         struct sctp_idata_chunk *ndchkh = NULL;
7208         uint32_t to_move, length;
7209         int leading;
7210         uint8_t rcv_flags = 0;
7211         uint8_t some_taken;
7212
7213         SCTP_TCB_LOCK_ASSERT(stcb);
7214         asoc = &stcb->asoc;
7215 one_more_time:
7216         /* sa_ignore FREED_MEMORY */
7217         sp = TAILQ_FIRST(&strq->outqueue);
7218         if (sp == NULL) {
7219                 sp = TAILQ_FIRST(&strq->outqueue);
7220                 if (sp) {
7221                         goto one_more_time;
7222                 }
7223                 if ((sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_EXPLICIT_EOR) == 0) &&
7224                     (stcb->asoc.idata_supported == 0) &&
7225                     (strq->last_msg_incomplete)) {
7226                         SCTP_PRINTF("Huh? Stream:%d lm_in_c=%d but queue is NULL\n",
7227                             strq->sid,
7228                             strq->last_msg_incomplete);
7229                         strq->last_msg_incomplete = 0;
7230                 }
7231                 to_move = 0;
7232                 goto out_of;
7233         }
7234         if ((sp->msg_is_complete) && (sp->length == 0)) {
7235                 if (sp->sender_all_done) {
7236                         /*
7237                          * We are doing deferred cleanup. Last time through
7238                          * when we took all the data the sender_all_done was
7239                          * not set.
7240                          */
7241                         if ((sp->put_last_out == 0) && (sp->discard_rest == 0)) {
7242                                 SCTP_PRINTF("Gak, put out entire msg with NO end!-1\n");
7243                                 SCTP_PRINTF("sender_done:%d len:%d msg_comp:%d put_last_out:%d\n",
7244                                     sp->sender_all_done,
7245                                     sp->length,
7246                                     sp->msg_is_complete,
7247                                     sp->put_last_out);
7248                         }
7249                         atomic_subtract_int(&asoc->stream_queue_cnt, 1);
7250                         TAILQ_REMOVE(&strq->outqueue, sp, next);
7251                         stcb->asoc.ss_functions.sctp_ss_remove_from_stream(stcb, asoc, strq, sp);
7252                         if ((strq->state == SCTP_STREAM_RESET_PENDING) &&
7253                             (strq->chunks_on_queues == 0) &&
7254                             TAILQ_EMPTY(&strq->outqueue)) {
7255                                 stcb->asoc.trigger_reset = 1;
7256                         }
7257                         if (sp->net) {
7258                                 sctp_free_remote_addr(sp->net);
7259                                 sp->net = NULL;
7260                         }
7261                         if (sp->data) {
7262                                 sctp_m_freem(sp->data);
7263                                 sp->data = NULL;
7264                         }
7265                         sctp_free_a_strmoq(stcb, sp, so_locked);
7266                         /* back to get the next msg */
7267                         goto one_more_time;
7268                 } else {
7269                         /*
7270                          * sender just finished this but still holds a
7271                          * reference
7272                          */
7273                         *giveup = 1;
7274                         to_move = 0;
7275                         goto out_of;
7276                 }
7277         } else {
7278                 /* is there some to get */
7279                 if (sp->length == 0) {
7280                         /* no */
7281                         *giveup = 1;
7282                         to_move = 0;
7283                         goto out_of;
7284                 } else if (sp->discard_rest) {
7285                         /* Whack down the size */
7286                         atomic_subtract_int(&stcb->asoc.total_output_queue_size, sp->length);
7287                         if ((stcb->sctp_socket != NULL) &&
7288                             ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
7289                             (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL))) {
7290                                 SCTP_SB_DECR(&stcb->sctp_socket->so_snd, sp->length);
7291                         }
7292                         if (sp->data) {
7293                                 sctp_m_freem(sp->data);
7294                                 sp->data = NULL;
7295                                 sp->tail_mbuf = NULL;
7296                         }
7297                         sp->length = 0;
7298                         sp->some_taken = 1;
7299                         *giveup = 1;
7300                         to_move = 0;
7301                         goto out_of;
7302                 }
7303         }
7304         some_taken = sp->some_taken;
7305         length = sp->length;
7306         if (sp->msg_is_complete) {
7307                 /* The message is complete */
7308                 to_move = min(length, frag_point);
7309                 if (to_move == length) {
7310                         /* All of it fits in the MTU */
7311                         if (sp->some_taken) {
7312                                 rcv_flags |= SCTP_DATA_LAST_FRAG;
7313                         } else {
7314                                 rcv_flags |= SCTP_DATA_NOT_FRAG;
7315                         }
7316                         sp->put_last_out = 1;
7317                         if (sp->sinfo_flags & SCTP_SACK_IMMEDIATELY) {
7318                                 rcv_flags |= SCTP_DATA_SACK_IMMEDIATELY;
7319                         }
7320                 } else {
7321                         /* Not all of it fits, we fragment */
7322                         if (sp->some_taken == 0) {
7323                                 rcv_flags |= SCTP_DATA_FIRST_FRAG;
7324                         }
7325                         sp->some_taken = 1;
7326                 }
7327         } else {
7328                 to_move = sctp_can_we_split_this(stcb, length, space_left, frag_point, eeor_mode);
7329                 if (to_move > 0) {
7330                         if (to_move >= length) {
7331                                 to_move = length;
7332                         }
7333                         if (sp->some_taken == 0) {
7334                                 rcv_flags |= SCTP_DATA_FIRST_FRAG;
7335                                 sp->some_taken = 1;
7336                         }
7337                 } else {
7338                         /* Nothing to take. */
7339                         *giveup = 1;
7340                         to_move = 0;
7341                         goto out_of;
7342                 }
7343         }
7344
7345         /* If we reach here, we can copy out a chunk */
7346         sctp_alloc_a_chunk(stcb, chk);
7347         if (chk == NULL) {
7348                 /* No chunk memory */
7349                 *giveup = 1;
7350                 to_move = 0;
7351                 goto out_of;
7352         }
7353         /*
7354          * Setup for unordered if needed by looking at the user sent info
7355          * flags.
7356          */
7357         if (sp->sinfo_flags & SCTP_UNORDERED) {
7358                 rcv_flags |= SCTP_DATA_UNORDERED;
7359         }
7360         if (SCTP_BASE_SYSCTL(sctp_enable_sack_immediately) &&
7361             (sp->sinfo_flags & SCTP_EOF) == SCTP_EOF) {
7362                 rcv_flags |= SCTP_DATA_SACK_IMMEDIATELY;
7363         }
7364         /* clear out the chunk before setting up */
7365         memset(chk, 0, sizeof(*chk));
7366         chk->rec.data.rcv_flags = rcv_flags;
7367
7368         if (to_move >= length) {
7369                 /* we think we can steal the whole thing */
7370                 if (to_move < sp->length) {
7371                         /* bail, it changed */
7372                         goto dont_do_it;
7373                 }
7374                 chk->data = sp->data;
7375                 chk->last_mbuf = sp->tail_mbuf;
7376                 /* register the stealing */
7377                 sp->data = sp->tail_mbuf = NULL;
7378         } else {
7379                 struct mbuf *m;
7380
7381 dont_do_it:
7382                 chk->data = SCTP_M_COPYM(sp->data, 0, to_move, M_NOWAIT);
7383                 chk->last_mbuf = NULL;
7384                 if (chk->data == NULL) {
7385                         sp->some_taken = some_taken;
7386                         sctp_free_a_chunk(stcb, chk, so_locked);
7387                         *bail = 1;
7388                         to_move = 0;
7389                         goto out_of;
7390                 }
7391 #ifdef SCTP_MBUF_LOGGING
7392                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
7393                         sctp_log_mbc(chk->data, SCTP_MBUF_ICOPY);
7394                 }
7395 #endif
7396                 /* Pull off the data */
7397                 m_adj(sp->data, to_move);
7398                 /* Now lets work our way down and compact it */
7399                 m = sp->data;
7400                 while (m && (SCTP_BUF_LEN(m) == 0)) {
7401                         sp->data = SCTP_BUF_NEXT(m);
7402                         SCTP_BUF_NEXT(m) = NULL;
7403                         if (sp->tail_mbuf == m) {
7404                                 /*-
7405                                  * Freeing tail? TSNH since
7406                                  * we supposedly were taking less
7407                                  * than the sp->length.
7408                                  */
7409 #ifdef INVARIANTS
7410                                 panic("Huh, freeing tail? - TSNH");
7411 #else
7412                                 SCTP_PRINTF("Huh, freeing tail? - TSNH\n");
7413                                 sp->tail_mbuf = sp->data = NULL;
7414                                 sp->length = 0;
7415 #endif
7416                         }
7417                         sctp_m_free(m);
7418                         m = sp->data;
7419                 }
7420         }
7421         if (SCTP_BUF_IS_EXTENDED(chk->data)) {
7422                 chk->copy_by_ref = 1;
7423         } else {
7424                 chk->copy_by_ref = 0;
7425         }
7426         /*
7427          * get last_mbuf and counts of mb usage This is ugly but hopefully
7428          * its only one mbuf.
7429          */
7430         if (chk->last_mbuf == NULL) {
7431                 chk->last_mbuf = chk->data;
7432                 while (SCTP_BUF_NEXT(chk->last_mbuf) != NULL) {
7433                         chk->last_mbuf = SCTP_BUF_NEXT(chk->last_mbuf);
7434                 }
7435         }
7436
7437         if (to_move > length) {
7438                 /*- This should not happen either
7439                  * since we always lower to_move to the size
7440                  * of sp->length if its larger.
7441                  */
7442 #ifdef INVARIANTS
7443                 panic("Huh, how can to_move be larger?");
7444 #else
7445                 SCTP_PRINTF("Huh, how can to_move be larger?\n");
7446                 sp->length = 0;
7447 #endif
7448         } else {
7449                 atomic_subtract_int(&sp->length, to_move);
7450         }
7451         leading = SCTP_DATA_CHUNK_OVERHEAD(stcb);
7452         if (M_LEADINGSPACE(chk->data) < leading) {
7453                 /* Not enough room for a chunk header, get some */
7454                 struct mbuf *m;
7455
7456                 m = sctp_get_mbuf_for_msg(1, 0, M_NOWAIT, 1, MT_DATA);
7457                 if (m == NULL) {
7458                         /*
7459                          * we're in trouble here. _PREPEND below will free
7460                          * all the data if there is no leading space, so we
7461                          * must put the data back and restore.
7462                          */
7463                         if (sp->data == NULL) {
7464                                 /* unsteal the data */
7465                                 sp->data = chk->data;
7466                                 sp->tail_mbuf = chk->last_mbuf;
7467                         } else {
7468                                 struct mbuf *m_tmp;
7469
7470                                 /* reassemble the data */
7471                                 m_tmp = sp->data;
7472                                 sp->data = chk->data;
7473                                 SCTP_BUF_NEXT(chk->last_mbuf) = m_tmp;
7474                         }
7475                         sp->some_taken = some_taken;
7476                         atomic_add_int(&sp->length, to_move);
7477                         chk->data = NULL;
7478                         *bail = 1;
7479                         sctp_free_a_chunk(stcb, chk, so_locked);
7480                         to_move = 0;
7481                         goto out_of;
7482                 } else {
7483                         SCTP_BUF_LEN(m) = 0;
7484                         SCTP_BUF_NEXT(m) = chk->data;
7485                         chk->data = m;
7486                         M_ALIGN(chk->data, 4);
7487                 }
7488         }
7489         SCTP_BUF_PREPEND(chk->data, SCTP_DATA_CHUNK_OVERHEAD(stcb), M_NOWAIT);
7490         if (chk->data == NULL) {
7491                 /* HELP, TSNH since we assured it would not above? */
7492 #ifdef INVARIANTS
7493                 panic("prepend fails HELP?");
7494 #else
7495                 SCTP_PRINTF("prepend fails HELP?\n");
7496                 sctp_free_a_chunk(stcb, chk, so_locked);
7497 #endif
7498                 *bail = 1;
7499                 to_move = 0;
7500                 goto out_of;
7501         }
7502         sctp_snd_sb_alloc(stcb, SCTP_DATA_CHUNK_OVERHEAD(stcb));
7503         chk->book_size = chk->send_size = (uint16_t)(to_move + SCTP_DATA_CHUNK_OVERHEAD(stcb));
7504         chk->book_size_scale = 0;
7505         chk->sent = SCTP_DATAGRAM_UNSENT;
7506
7507         chk->flags = 0;
7508         chk->asoc = &stcb->asoc;
7509         chk->pad_inplace = 0;
7510         chk->no_fr_allowed = 0;
7511         if (stcb->asoc.idata_supported == 0) {
7512                 if (rcv_flags & SCTP_DATA_UNORDERED) {
7513                         /* Just use 0. The receiver ignores the values. */
7514                         chk->rec.data.mid = 0;
7515                 } else {
7516                         chk->rec.data.mid = strq->next_mid_ordered;
7517                         if (rcv_flags & SCTP_DATA_LAST_FRAG) {
7518                                 strq->next_mid_ordered++;
7519                         }
7520                 }
7521         } else {
7522                 if (rcv_flags & SCTP_DATA_UNORDERED) {
7523                         chk->rec.data.mid = strq->next_mid_unordered;
7524                         if (rcv_flags & SCTP_DATA_LAST_FRAG) {
7525                                 strq->next_mid_unordered++;
7526                         }
7527                 } else {
7528                         chk->rec.data.mid = strq->next_mid_ordered;
7529                         if (rcv_flags & SCTP_DATA_LAST_FRAG) {
7530                                 strq->next_mid_ordered++;
7531                         }
7532                 }
7533         }
7534         chk->rec.data.sid = sp->sid;
7535         chk->rec.data.ppid = sp->ppid;
7536         chk->rec.data.context = sp->context;
7537         chk->rec.data.doing_fast_retransmit = 0;
7538
7539         chk->rec.data.timetodrop = sp->ts;
7540         chk->flags = sp->act_flags;
7541
7542         if (sp->net) {
7543                 chk->whoTo = sp->net;
7544                 atomic_add_int(&chk->whoTo->ref_count, 1);
7545         } else
7546                 chk->whoTo = NULL;
7547
7548         if (sp->holds_key_ref) {
7549                 chk->auth_keyid = sp->auth_keyid;
7550                 sctp_auth_key_acquire(stcb, chk->auth_keyid);
7551                 chk->holds_key_ref = 1;
7552         }
7553         stcb->asoc.ss_functions.sctp_ss_scheduled(stcb, net, asoc, strq, to_move);
7554         chk->rec.data.tsn = atomic_fetchadd_int(&asoc->sending_seq, 1);
7555         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_AT_SEND_2_OUTQ) {
7556                 sctp_misc_ints(SCTP_STRMOUT_LOG_SEND,
7557                     (uint32_t)(uintptr_t)stcb, sp->length,
7558                     (uint32_t)((chk->rec.data.sid << 16) | (0x0000ffff & chk->rec.data.mid)),
7559                     chk->rec.data.tsn);
7560         }
7561         if (stcb->asoc.idata_supported == 0) {
7562                 dchkh = mtod(chk->data, struct sctp_data_chunk *);
7563         } else {
7564                 ndchkh = mtod(chk->data, struct sctp_idata_chunk *);
7565         }
7566         /*
7567          * Put the rest of the things in place now. Size was done earlier in
7568          * previous loop prior to padding.
7569          */
7570
7571         SCTP_TCB_LOCK_ASSERT(stcb);
7572 #ifdef SCTP_ASOCLOG_OF_TSNS
7573         if (asoc->tsn_out_at >= SCTP_TSN_LOG_SIZE) {
7574                 asoc->tsn_out_at = 0;
7575                 asoc->tsn_out_wrapped = 1;
7576         }
7577         asoc->out_tsnlog[asoc->tsn_out_at].tsn = chk->rec.data.tsn;
7578         asoc->out_tsnlog[asoc->tsn_out_at].strm = chk->rec.data.sid;
7579         asoc->out_tsnlog[asoc->tsn_out_at].seq = chk->rec.data.mid;
7580         asoc->out_tsnlog[asoc->tsn_out_at].sz = chk->send_size;
7581         asoc->out_tsnlog[asoc->tsn_out_at].flgs = chk->rec.data.rcv_flags;
7582         asoc->out_tsnlog[asoc->tsn_out_at].stcb = (void *)stcb;
7583         asoc->out_tsnlog[asoc->tsn_out_at].in_pos = asoc->tsn_out_at;
7584         asoc->out_tsnlog[asoc->tsn_out_at].in_out = 2;
7585         asoc->tsn_out_at++;
7586 #endif
7587         if (stcb->asoc.idata_supported == 0) {
7588                 dchkh->ch.chunk_type = SCTP_DATA;
7589                 dchkh->ch.chunk_flags = chk->rec.data.rcv_flags;
7590                 dchkh->dp.tsn = htonl(chk->rec.data.tsn);
7591                 dchkh->dp.sid = htons(strq->sid);
7592                 dchkh->dp.ssn = htons((uint16_t)chk->rec.data.mid);
7593                 dchkh->dp.ppid = chk->rec.data.ppid;
7594                 dchkh->ch.chunk_length = htons(chk->send_size);
7595         } else {
7596                 ndchkh->ch.chunk_type = SCTP_IDATA;
7597                 ndchkh->ch.chunk_flags = chk->rec.data.rcv_flags;
7598                 ndchkh->dp.tsn = htonl(chk->rec.data.tsn);
7599                 ndchkh->dp.sid = htons(strq->sid);
7600                 ndchkh->dp.reserved = htons(0);
7601                 ndchkh->dp.mid = htonl(chk->rec.data.mid);
7602                 if (sp->fsn == 0)
7603                         ndchkh->dp.ppid_fsn.ppid = chk->rec.data.ppid;
7604                 else
7605                         ndchkh->dp.ppid_fsn.fsn = htonl(sp->fsn);
7606                 sp->fsn++;
7607                 ndchkh->ch.chunk_length = htons(chk->send_size);
7608         }
7609         /* Now advance the chk->send_size by the actual pad needed. */
7610         if (chk->send_size < SCTP_SIZE32(chk->book_size)) {
7611                 /* need a pad */
7612                 struct mbuf *lm;
7613                 int pads;
7614
7615                 pads = SCTP_SIZE32(chk->book_size) - chk->send_size;
7616                 lm = sctp_pad_lastmbuf(chk->data, pads, chk->last_mbuf);
7617                 if (lm != NULL) {
7618                         chk->last_mbuf = lm;
7619                         chk->pad_inplace = 1;
7620                 }
7621                 chk->send_size += pads;
7622         }
7623         if (PR_SCTP_ENABLED(chk->flags)) {
7624                 asoc->pr_sctp_cnt++;
7625         }
7626         if (sp->msg_is_complete && (sp->length == 0) && (sp->sender_all_done)) {
7627                 /* All done pull and kill the message */
7628                 if (sp->put_last_out == 0) {
7629                         SCTP_PRINTF("Gak, put out entire msg with NO end!-2\n");
7630                         SCTP_PRINTF("sender_done:%d len:%d msg_comp:%d put_last_out:%d\n",
7631                             sp->sender_all_done,
7632                             sp->length,
7633                             sp->msg_is_complete,
7634                             sp->put_last_out);
7635                 }
7636                 atomic_subtract_int(&asoc->stream_queue_cnt, 1);
7637                 TAILQ_REMOVE(&strq->outqueue, sp, next);
7638                 stcb->asoc.ss_functions.sctp_ss_remove_from_stream(stcb, asoc, strq, sp);
7639                 if ((strq->state == SCTP_STREAM_RESET_PENDING) &&
7640                     (strq->chunks_on_queues == 0) &&
7641                     TAILQ_EMPTY(&strq->outqueue)) {
7642                         stcb->asoc.trigger_reset = 1;
7643                 }
7644                 if (sp->net) {
7645                         sctp_free_remote_addr(sp->net);
7646                         sp->net = NULL;
7647                 }
7648                 if (sp->data) {
7649                         sctp_m_freem(sp->data);
7650                         sp->data = NULL;
7651                 }
7652                 sctp_free_a_strmoq(stcb, sp, so_locked);
7653         }
7654         asoc->chunks_on_out_queue++;
7655         strq->chunks_on_queues++;
7656         TAILQ_INSERT_TAIL(&asoc->send_queue, chk, sctp_next);
7657         asoc->send_queue_cnt++;
7658 out_of:
7659         return (to_move);
7660 }
7661
7662 static void
7663 sctp_fill_outqueue(struct sctp_tcb *stcb, struct sctp_nets *net,
7664     uint32_t frag_point, int eeor_mode, int *quit_now,
7665     int so_locked)
7666 {
7667         struct sctp_association *asoc;
7668         struct sctp_stream_out *strq;
7669         uint32_t space_left, moved, total_moved;
7670         int bail, giveup;
7671
7672         SCTP_TCB_LOCK_ASSERT(stcb);
7673         asoc = &stcb->asoc;
7674         total_moved = 0;
7675         switch (net->ro._l_addr.sa.sa_family) {
7676 #ifdef INET
7677         case AF_INET:
7678                 space_left = net->mtu - SCTP_MIN_V4_OVERHEAD;
7679                 break;
7680 #endif
7681 #ifdef INET6
7682         case AF_INET6:
7683                 space_left = net->mtu - SCTP_MIN_OVERHEAD;
7684                 break;
7685 #endif
7686         default:
7687                 /* TSNH */
7688                 space_left = net->mtu;
7689                 break;
7690         }
7691         /* Need an allowance for the data chunk header too */
7692         space_left -= SCTP_DATA_CHUNK_OVERHEAD(stcb);
7693
7694         /* must make even word boundary */
7695         space_left &= 0xfffffffc;
7696         strq = stcb->asoc.ss_functions.sctp_ss_select_stream(stcb, net, asoc);
7697         giveup = 0;
7698         bail = 0;
7699         while ((space_left > 0) && (strq != NULL)) {
7700                 moved = sctp_move_to_outqueue(stcb, net, strq, space_left,
7701                     frag_point, &giveup, eeor_mode,
7702                     &bail, so_locked);
7703                 if ((giveup != 0) || (bail != 0)) {
7704                         break;
7705                 }
7706                 strq = stcb->asoc.ss_functions.sctp_ss_select_stream(stcb, net, asoc);
7707                 total_moved += moved;
7708                 if (space_left >= moved) {
7709                         space_left -= moved;
7710                 } else {
7711                         space_left = 0;
7712                 }
7713                 if (space_left >= SCTP_DATA_CHUNK_OVERHEAD(stcb)) {
7714                         space_left -= SCTP_DATA_CHUNK_OVERHEAD(stcb);
7715                 } else {
7716                         space_left = 0;
7717                 }
7718                 space_left &= 0xfffffffc;
7719         }
7720         if (bail != 0)
7721                 *quit_now = 1;
7722
7723         stcb->asoc.ss_functions.sctp_ss_packet_done(stcb, net, asoc);
7724
7725         if (total_moved == 0) {
7726                 if ((stcb->asoc.sctp_cmt_on_off == 0) &&
7727                     (net == stcb->asoc.primary_destination)) {
7728                         /* ran dry for primary network net */
7729                         SCTP_STAT_INCR(sctps_primary_randry);
7730                 } else if (stcb->asoc.sctp_cmt_on_off > 0) {
7731                         /* ran dry with CMT on */
7732                         SCTP_STAT_INCR(sctps_cmt_randry);
7733                 }
7734         }
7735 }
7736
7737 void
7738 sctp_fix_ecn_echo(struct sctp_association *asoc)
7739 {
7740         struct sctp_tmit_chunk *chk;
7741
7742         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
7743                 if (chk->rec.chunk_id.id == SCTP_ECN_ECHO) {
7744                         chk->sent = SCTP_DATAGRAM_UNSENT;
7745                 }
7746         }
7747 }
7748
7749 void
7750 sctp_move_chunks_from_net(struct sctp_tcb *stcb, struct sctp_nets *net)
7751 {
7752         struct sctp_association *asoc;
7753         struct sctp_tmit_chunk *chk;
7754         struct sctp_stream_queue_pending *sp;
7755         unsigned int i;
7756
7757         if (net == NULL) {
7758                 return;
7759         }
7760         asoc = &stcb->asoc;
7761         for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
7762                 TAILQ_FOREACH(sp, &stcb->asoc.strmout[i].outqueue, next) {
7763                         if (sp->net == net) {
7764                                 sctp_free_remote_addr(sp->net);
7765                                 sp->net = NULL;
7766                         }
7767                 }
7768         }
7769         TAILQ_FOREACH(chk, &asoc->send_queue, sctp_next) {
7770                 if (chk->whoTo == net) {
7771                         sctp_free_remote_addr(chk->whoTo);
7772                         chk->whoTo = NULL;
7773                 }
7774         }
7775 }
7776
7777 int
7778 sctp_med_chunk_output(struct sctp_inpcb *inp,
7779     struct sctp_tcb *stcb,
7780     struct sctp_association *asoc,
7781     int *num_out,
7782     int *reason_code,
7783     int control_only, int from_where,
7784     struct timeval *now, int *now_filled,
7785     uint32_t frag_point, int so_locked)
7786 {
7787         /**
7788          * Ok this is the generic chunk service queue. we must do the
7789          * following:
7790          * - Service the stream queue that is next, moving any
7791          *   message (note I must get a complete message i.e. FIRST/MIDDLE and
7792          *   LAST to the out queue in one pass) and assigning TSN's. This
7793          *   only applies though if the peer does not support NDATA. For NDATA
7794          *   chunks its ok to not send the entire message ;-)
7795          * - Check to see if the cwnd/rwnd allows any output, if so we go ahead and
7796          *   formulate and send the low level chunks. Making sure to combine
7797          *   any control in the control chunk queue also.
7798          */
7799         struct sctp_nets *net, *start_at, *sack_goes_to = NULL, *old_start_at = NULL;
7800         struct mbuf *outchain, *endoutchain;
7801         struct sctp_tmit_chunk *chk, *nchk;
7802
7803         /* temp arrays for unlinking */
7804         struct sctp_tmit_chunk *data_list[SCTP_MAX_DATA_BUNDLING];
7805         int no_fragmentflg, error;
7806         unsigned int max_rwnd_per_dest, max_send_per_dest;
7807         int one_chunk, hbflag, skip_data_for_this_net;
7808         int asconf, cookie, no_out_cnt;
7809         int bundle_at, ctl_cnt, no_data_chunks, eeor_mode;
7810         unsigned int mtu, r_mtu, omtu, mx_mtu, to_out;
7811         int tsns_sent = 0;
7812         uint32_t auth_offset;
7813         struct sctp_auth_chunk *auth;
7814         uint16_t auth_keyid;
7815         int override_ok = 1;
7816         int skip_fill_up = 0;
7817         int data_auth_reqd = 0;
7818
7819         /*
7820          * JRS 5/14/07 - Add flag for whether a heartbeat is sent to the
7821          * destination.
7822          */
7823         int quit_now = 0;
7824         bool use_zero_crc;
7825
7826         *num_out = 0;
7827         *reason_code = 0;
7828         auth_keyid = stcb->asoc.authinfo.active_keyid;
7829         if ((asoc->state & SCTP_STATE_SHUTDOWN_PENDING) ||
7830             (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_RECEIVED) ||
7831             (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_EXPLICIT_EOR))) {
7832                 eeor_mode = 1;
7833         } else {
7834                 eeor_mode = 0;
7835         }
7836         ctl_cnt = no_out_cnt = asconf = cookie = 0;
7837         /*
7838          * First lets prime the pump. For each destination, if there is room
7839          * in the flight size, attempt to pull an MTU's worth out of the
7840          * stream queues into the general send_queue
7841          */
7842 #ifdef SCTP_AUDITING_ENABLED
7843         sctp_audit_log(0xC2, 2);
7844 #endif
7845         SCTP_TCB_LOCK_ASSERT(stcb);
7846         hbflag = 0;
7847         if (control_only)
7848                 no_data_chunks = 1;
7849         else
7850                 no_data_chunks = 0;
7851
7852         /* Nothing to possible to send? */
7853         if ((TAILQ_EMPTY(&asoc->control_send_queue) ||
7854             (asoc->ctrl_queue_cnt == stcb->asoc.ecn_echo_cnt_onq)) &&
7855             TAILQ_EMPTY(&asoc->asconf_send_queue) &&
7856             TAILQ_EMPTY(&asoc->send_queue) &&
7857             sctp_is_there_unsent_data(stcb, so_locked) == 0) {
7858 nothing_to_send:
7859                 *reason_code = 9;
7860                 return (0);
7861         }
7862         if (asoc->peers_rwnd == 0) {
7863                 /* No room in peers rwnd */
7864                 *reason_code = 1;
7865                 if (asoc->total_flight > 0) {
7866                         /* we are allowed one chunk in flight */
7867                         no_data_chunks = 1;
7868                 }
7869         }
7870         if (stcb->asoc.ecn_echo_cnt_onq) {
7871                 /* Record where a sack goes, if any */
7872                 if (no_data_chunks &&
7873                     (asoc->ctrl_queue_cnt == stcb->asoc.ecn_echo_cnt_onq)) {
7874                         /* Nothing but ECNe to send - we don't do that */
7875                         goto nothing_to_send;
7876                 }
7877                 TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
7878                         if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
7879                             (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK)) {
7880                                 sack_goes_to = chk->whoTo;
7881                                 break;
7882                         }
7883                 }
7884         }
7885         max_rwnd_per_dest = ((asoc->peers_rwnd + asoc->total_flight) / asoc->numnets);
7886         if (stcb->sctp_socket)
7887                 max_send_per_dest = SCTP_SB_LIMIT_SND(stcb->sctp_socket) / asoc->numnets;
7888         else
7889                 max_send_per_dest = 0;
7890         if (no_data_chunks == 0) {
7891                 /* How many non-directed chunks are there? */
7892                 TAILQ_FOREACH(chk, &asoc->send_queue, sctp_next) {
7893                         if (chk->whoTo == NULL) {
7894                                 /*
7895                                  * We already have non-directed chunks on
7896                                  * the queue, no need to do a fill-up.
7897                                  */
7898                                 skip_fill_up = 1;
7899                                 break;
7900                         }
7901                 }
7902         }
7903         if ((no_data_chunks == 0) &&
7904             (skip_fill_up == 0) &&
7905             (!stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc))) {
7906                 TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
7907                         /*
7908                          * This for loop we are in takes in each net, if
7909                          * its's got space in cwnd and has data sent to it
7910                          * (when CMT is off) then it calls
7911                          * sctp_fill_outqueue for the net. This gets data on
7912                          * the send queue for that network.
7913                          *
7914                          * In sctp_fill_outqueue TSN's are assigned and data
7915                          * is copied out of the stream buffers. Note mostly
7916                          * copy by reference (we hope).
7917                          */
7918                         net->window_probe = 0;
7919                         if ((net != stcb->asoc.alternate) &&
7920                             ((net->dest_state & SCTP_ADDR_PF) ||
7921                             ((net->dest_state & SCTP_ADDR_REACHABLE) == 0) ||
7922                             (net->dest_state & SCTP_ADDR_UNCONFIRMED))) {
7923                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
7924                                         sctp_log_cwnd(stcb, net, 1,
7925                                             SCTP_CWND_LOG_FILL_OUTQ_CALLED);
7926                                 }
7927                                 continue;
7928                         }
7929                         if ((stcb->asoc.cc_functions.sctp_cwnd_new_transmission_begins) &&
7930                             (net->flight_size == 0)) {
7931                                 (*stcb->asoc.cc_functions.sctp_cwnd_new_transmission_begins) (stcb, net);
7932                         }
7933                         if (net->flight_size >= net->cwnd) {
7934                                 /* skip this network, no room - can't fill */
7935                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
7936                                         sctp_log_cwnd(stcb, net, 3,
7937                                             SCTP_CWND_LOG_FILL_OUTQ_CALLED);
7938                                 }
7939                                 continue;
7940                         }
7941                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
7942                                 sctp_log_cwnd(stcb, net, 4, SCTP_CWND_LOG_FILL_OUTQ_CALLED);
7943                         }
7944                         sctp_fill_outqueue(stcb, net, frag_point, eeor_mode, &quit_now, so_locked);
7945                         if (quit_now) {
7946                                 /* memory alloc failure */
7947                                 no_data_chunks = 1;
7948                                 break;
7949                         }
7950                 }
7951         }
7952         /* now service each destination and send out what we can for it */
7953         /* Nothing to send? */
7954         if (TAILQ_EMPTY(&asoc->control_send_queue) &&
7955             TAILQ_EMPTY(&asoc->asconf_send_queue) &&
7956             TAILQ_EMPTY(&asoc->send_queue)) {
7957                 *reason_code = 8;
7958                 return (0);
7959         }
7960
7961         if (asoc->sctp_cmt_on_off > 0) {
7962                 /* get the last start point */
7963                 start_at = asoc->last_net_cmt_send_started;
7964                 if (start_at == NULL) {
7965                         /* null so to beginning */
7966                         start_at = TAILQ_FIRST(&asoc->nets);
7967                 } else {
7968                         start_at = TAILQ_NEXT(asoc->last_net_cmt_send_started, sctp_next);
7969                         if (start_at == NULL) {
7970                                 start_at = TAILQ_FIRST(&asoc->nets);
7971                         }
7972                 }
7973                 asoc->last_net_cmt_send_started = start_at;
7974         } else {
7975                 start_at = TAILQ_FIRST(&asoc->nets);
7976         }
7977         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
7978                 if (chk->whoTo == NULL) {
7979                         if (asoc->alternate) {
7980                                 chk->whoTo = asoc->alternate;
7981                         } else {
7982                                 chk->whoTo = asoc->primary_destination;
7983                         }
7984                         atomic_add_int(&chk->whoTo->ref_count, 1);
7985                 }
7986         }
7987         old_start_at = NULL;
7988 again_one_more_time:
7989         for (net = start_at; net != NULL; net = TAILQ_NEXT(net, sctp_next)) {
7990                 /* how much can we send? */
7991                 /* SCTPDBG("Examine for sending net:%x\n", (uint32_t)net); */
7992                 if (old_start_at && (old_start_at == net)) {
7993                         /* through list completely. */
7994                         break;
7995                 }
7996                 tsns_sent = 0xa;
7997                 if (TAILQ_EMPTY(&asoc->control_send_queue) &&
7998                     TAILQ_EMPTY(&asoc->asconf_send_queue) &&
7999                     (net->flight_size >= net->cwnd)) {
8000                         /*
8001                          * Nothing on control or asconf and flight is full,
8002                          * we can skip even in the CMT case.
8003                          */
8004                         continue;
8005                 }
8006                 bundle_at = 0;
8007                 endoutchain = outchain = NULL;
8008                 auth = NULL;
8009                 auth_offset = 0;
8010                 no_fragmentflg = 1;
8011                 one_chunk = 0;
8012                 if (net->dest_state & SCTP_ADDR_UNCONFIRMED) {
8013                         skip_data_for_this_net = 1;
8014                 } else {
8015                         skip_data_for_this_net = 0;
8016                 }
8017                 switch (((struct sockaddr *)&net->ro._l_addr)->sa_family) {
8018 #ifdef INET
8019                 case AF_INET:
8020                         mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
8021                         break;
8022 #endif
8023 #ifdef INET6
8024                 case AF_INET6:
8025                         mtu = net->mtu - SCTP_MIN_OVERHEAD;
8026                         break;
8027 #endif
8028                 default:
8029                         /* TSNH */
8030                         mtu = net->mtu;
8031                         break;
8032                 }
8033                 mx_mtu = mtu;
8034                 to_out = 0;
8035                 if (mtu > asoc->peers_rwnd) {
8036                         if (asoc->total_flight > 0) {
8037                                 /* We have a packet in flight somewhere */
8038                                 r_mtu = asoc->peers_rwnd;
8039                         } else {
8040                                 /* We are always allowed to send one MTU out */
8041                                 one_chunk = 1;
8042                                 r_mtu = mtu;
8043                         }
8044                 } else {
8045                         r_mtu = mtu;
8046                 }
8047                 error = 0;
8048                 /************************/
8049                 /* ASCONF transmission */
8050                 /************************/
8051                 /* Now first lets go through the asconf queue */
8052                 TAILQ_FOREACH_SAFE(chk, &asoc->asconf_send_queue, sctp_next, nchk) {
8053                         if (chk->rec.chunk_id.id != SCTP_ASCONF) {
8054                                 continue;
8055                         }
8056                         if (chk->whoTo == NULL) {
8057                                 if (asoc->alternate == NULL) {
8058                                         if (asoc->primary_destination != net) {
8059                                                 break;
8060                                         }
8061                                 } else {
8062                                         if (asoc->alternate != net) {
8063                                                 break;
8064                                         }
8065                                 }
8066                         } else {
8067                                 if (chk->whoTo != net) {
8068                                         break;
8069                                 }
8070                         }
8071                         if (chk->data == NULL) {
8072                                 break;
8073                         }
8074                         if (chk->sent != SCTP_DATAGRAM_UNSENT &&
8075                             chk->sent != SCTP_DATAGRAM_RESEND) {
8076                                 break;
8077                         }
8078                         /*
8079                          * if no AUTH is yet included and this chunk
8080                          * requires it, make sure to account for it.  We
8081                          * don't apply the size until the AUTH chunk is
8082                          * actually added below in case there is no room for
8083                          * this chunk. NOTE: we overload the use of "omtu"
8084                          * here
8085                          */
8086                         if ((auth == NULL) &&
8087                             sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
8088                             stcb->asoc.peer_auth_chunks)) {
8089                                 omtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
8090                         } else
8091                                 omtu = 0;
8092                         /* Here we do NOT factor the r_mtu */
8093                         if ((chk->send_size < (int)(mtu - omtu)) ||
8094                             (chk->flags & CHUNK_FLAGS_FRAGMENT_OK)) {
8095                                 /*
8096                                  * We probably should glom the mbuf chain
8097                                  * from the chk->data for control but the
8098                                  * problem is it becomes yet one more level
8099                                  * of tracking to do if for some reason
8100                                  * output fails. Then I have got to
8101                                  * reconstruct the merged control chain.. el
8102                                  * yucko.. for now we take the easy way and
8103                                  * do the copy
8104                                  */
8105                                 /*
8106                                  * Add an AUTH chunk, if chunk requires it
8107                                  * save the offset into the chain for AUTH
8108                                  */
8109                                 if ((auth == NULL) &&
8110                                     (sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
8111                                     stcb->asoc.peer_auth_chunks))) {
8112                                         outchain = sctp_add_auth_chunk(outchain,
8113                                             &endoutchain,
8114                                             &auth,
8115                                             &auth_offset,
8116                                             stcb,
8117                                             chk->rec.chunk_id.id);
8118                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8119                                 }
8120                                 outchain = sctp_copy_mbufchain(chk->data, outchain, &endoutchain,
8121                                     (int)chk->rec.chunk_id.can_take_data,
8122                                     chk->send_size, chk->copy_by_ref);
8123                                 if (outchain == NULL) {
8124                                         *reason_code = 8;
8125                                         SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
8126                                         return (ENOMEM);
8127                                 }
8128                                 SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8129                                 /* update our MTU size */
8130                                 if (mtu > (chk->send_size + omtu))
8131                                         mtu -= (chk->send_size + omtu);
8132                                 else
8133                                         mtu = 0;
8134                                 to_out += (chk->send_size + omtu);
8135                                 /* Do clear IP_DF ? */
8136                                 if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
8137                                         no_fragmentflg = 0;
8138                                 }
8139                                 if (chk->rec.chunk_id.can_take_data)
8140                                         chk->data = NULL;
8141                                 /*
8142                                  * set hb flag since we can use these for
8143                                  * RTO
8144                                  */
8145                                 hbflag = 1;
8146                                 asconf = 1;
8147                                 /*
8148                                  * should sysctl this: don't bundle data
8149                                  * with ASCONF since it requires AUTH
8150                                  */
8151                                 no_data_chunks = 1;
8152                                 chk->sent = SCTP_DATAGRAM_SENT;
8153                                 if (chk->whoTo == NULL) {
8154                                         chk->whoTo = net;
8155                                         atomic_add_int(&net->ref_count, 1);
8156                                 }
8157                                 chk->snd_count++;
8158                                 if (mtu == 0) {
8159                                         /*
8160                                          * Ok we are out of room but we can
8161                                          * output without effecting the
8162                                          * flight size since this little guy
8163                                          * is a control only packet.
8164                                          */
8165                                         sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp, stcb, net);
8166                                         /*
8167                                          * do NOT clear the asconf flag as
8168                                          * it is used to do appropriate
8169                                          * source address selection.
8170                                          */
8171                                         if (*now_filled == 0) {
8172                                                 (void)SCTP_GETTIME_TIMEVAL(now);
8173                                                 *now_filled = 1;
8174                                         }
8175                                         net->last_sent_time = *now;
8176                                         hbflag = 0;
8177                                         if ((error = sctp_lowlevel_chunk_output(inp, stcb, net,
8178                                             (struct sockaddr *)&net->ro._l_addr,
8179                                             outchain, auth_offset, auth,
8180                                             stcb->asoc.authinfo.active_keyid,
8181                                             no_fragmentflg, 0, asconf,
8182                                             inp->sctp_lport, stcb->rport,
8183                                             htonl(stcb->asoc.peer_vtag),
8184                                             net->port, NULL,
8185                                             0, 0,
8186                                             false, so_locked))) {
8187                                                 /*
8188                                                  * error, we could not
8189                                                  * output
8190                                                  */
8191                                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
8192                                                 if (from_where == 0) {
8193                                                         SCTP_STAT_INCR(sctps_lowlevelerrusr);
8194                                                 }
8195                                                 if (error == ENOBUFS) {
8196                                                         asoc->ifp_had_enobuf = 1;
8197                                                         SCTP_STAT_INCR(sctps_lowlevelerr);
8198                                                 }
8199                                                 /* error, could not output */
8200                                                 if (error == EHOSTUNREACH) {
8201                                                         /*
8202                                                          * Destination went
8203                                                          * unreachable
8204                                                          * during this send
8205                                                          */
8206                                                         sctp_move_chunks_from_net(stcb, net);
8207                                                 }
8208                                                 asconf = 0;
8209                                                 *reason_code = 7;
8210                                                 break;
8211                                         } else {
8212                                                 asoc->ifp_had_enobuf = 0;
8213                                         }
8214                                         /*
8215                                          * increase the number we sent, if a
8216                                          * cookie is sent we don't tell them
8217                                          * any was sent out.
8218                                          */
8219                                         outchain = endoutchain = NULL;
8220                                         auth = NULL;
8221                                         auth_offset = 0;
8222                                         asconf = 0;
8223                                         if (!no_out_cnt)
8224                                                 *num_out += ctl_cnt;
8225                                         /* recalc a clean slate and setup */
8226                                         switch (net->ro._l_addr.sa.sa_family) {
8227 #ifdef INET
8228                                         case AF_INET:
8229                                                 mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
8230                                                 break;
8231 #endif
8232 #ifdef INET6
8233                                         case AF_INET6:
8234                                                 mtu = net->mtu - SCTP_MIN_OVERHEAD;
8235                                                 break;
8236 #endif
8237                                         default:
8238                                                 /* TSNH */
8239                                                 mtu = net->mtu;
8240                                                 break;
8241                                         }
8242                                         to_out = 0;
8243                                         no_fragmentflg = 1;
8244                                 }
8245                         }
8246                 }
8247                 if (error != 0) {
8248                         /* try next net */
8249                         continue;
8250                 }
8251                 /************************/
8252                 /* Control transmission */
8253                 /************************/
8254                 /* Now first lets go through the control queue */
8255                 TAILQ_FOREACH_SAFE(chk, &asoc->control_send_queue, sctp_next, nchk) {
8256                         if ((sack_goes_to) &&
8257                             (chk->rec.chunk_id.id == SCTP_ECN_ECHO) &&
8258                             (chk->whoTo != sack_goes_to)) {
8259                                 /*
8260                                  * if we have a sack in queue, and we are
8261                                  * looking at an ecn echo that is NOT queued
8262                                  * to where the sack is going..
8263                                  */
8264                                 if (chk->whoTo == net) {
8265                                         /*
8266                                          * Don't transmit it to where its
8267                                          * going (current net)
8268                                          */
8269                                         continue;
8270                                 } else if (sack_goes_to == net) {
8271                                         /*
8272                                          * But do transmit it to this
8273                                          * address
8274                                          */
8275                                         goto skip_net_check;
8276                                 }
8277                         }
8278                         if (chk->whoTo == NULL) {
8279                                 if (asoc->alternate == NULL) {
8280                                         if (asoc->primary_destination != net) {
8281                                                 continue;
8282                                         }
8283                                 } else {
8284                                         if (asoc->alternate != net) {
8285                                                 continue;
8286                                         }
8287                                 }
8288                         } else {
8289                                 if (chk->whoTo != net) {
8290                                         continue;
8291                                 }
8292                         }
8293         skip_net_check:
8294                         if (chk->data == NULL) {
8295                                 continue;
8296                         }
8297                         if (chk->sent != SCTP_DATAGRAM_UNSENT) {
8298                                 /*
8299                                  * It must be unsent. Cookies and ASCONF's
8300                                  * hang around but there timers will force
8301                                  * when marked for resend.
8302                                  */
8303                                 continue;
8304                         }
8305                         /*
8306                          * if no AUTH is yet included and this chunk
8307                          * requires it, make sure to account for it.  We
8308                          * don't apply the size until the AUTH chunk is
8309                          * actually added below in case there is no room for
8310                          * this chunk. NOTE: we overload the use of "omtu"
8311                          * here
8312                          */
8313                         if ((auth == NULL) &&
8314                             sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
8315                             stcb->asoc.peer_auth_chunks)) {
8316                                 omtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
8317                         } else
8318                                 omtu = 0;
8319                         /* Here we do NOT factor the r_mtu */
8320                         if ((chk->send_size <= (int)(mtu - omtu)) ||
8321                             (chk->flags & CHUNK_FLAGS_FRAGMENT_OK)) {
8322                                 /*
8323                                  * We probably should glom the mbuf chain
8324                                  * from the chk->data for control but the
8325                                  * problem is it becomes yet one more level
8326                                  * of tracking to do if for some reason
8327                                  * output fails. Then I have got to
8328                                  * reconstruct the merged control chain.. el
8329                                  * yucko.. for now we take the easy way and
8330                                  * do the copy
8331                                  */
8332                                 /*
8333                                  * Add an AUTH chunk, if chunk requires it
8334                                  * save the offset into the chain for AUTH
8335                                  */
8336                                 if ((auth == NULL) &&
8337                                     (sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
8338                                     stcb->asoc.peer_auth_chunks))) {
8339                                         outchain = sctp_add_auth_chunk(outchain,
8340                                             &endoutchain,
8341                                             &auth,
8342                                             &auth_offset,
8343                                             stcb,
8344                                             chk->rec.chunk_id.id);
8345                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8346                                 }
8347                                 outchain = sctp_copy_mbufchain(chk->data, outchain, &endoutchain,
8348                                     (int)chk->rec.chunk_id.can_take_data,
8349                                     chk->send_size, chk->copy_by_ref);
8350                                 if (outchain == NULL) {
8351                                         *reason_code = 8;
8352                                         SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
8353                                         return (ENOMEM);
8354                                 }
8355                                 SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8356                                 /* update our MTU size */
8357                                 if (mtu > (chk->send_size + omtu))
8358                                         mtu -= (chk->send_size + omtu);
8359                                 else
8360                                         mtu = 0;
8361                                 to_out += (chk->send_size + omtu);
8362                                 /* Do clear IP_DF ? */
8363                                 if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
8364                                         no_fragmentflg = 0;
8365                                 }
8366                                 if (chk->rec.chunk_id.can_take_data)
8367                                         chk->data = NULL;
8368                                 /* Mark things to be removed, if needed */
8369                                 if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
8370                                     (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK) ||  /* EY */
8371                                     (chk->rec.chunk_id.id == SCTP_HEARTBEAT_REQUEST) ||
8372                                     (chk->rec.chunk_id.id == SCTP_HEARTBEAT_ACK) ||
8373                                     (chk->rec.chunk_id.id == SCTP_SHUTDOWN) ||
8374                                     (chk->rec.chunk_id.id == SCTP_SHUTDOWN_ACK) ||
8375                                     (chk->rec.chunk_id.id == SCTP_OPERATION_ERROR) ||
8376                                     (chk->rec.chunk_id.id == SCTP_COOKIE_ACK) ||
8377                                     (chk->rec.chunk_id.id == SCTP_ECN_CWR) ||
8378                                     (chk->rec.chunk_id.id == SCTP_PACKET_DROPPED) ||
8379                                     (chk->rec.chunk_id.id == SCTP_ASCONF_ACK)) {
8380                                         if (chk->rec.chunk_id.id == SCTP_HEARTBEAT_REQUEST) {
8381                                                 hbflag = 1;
8382                                         }
8383                                         /* remove these chunks at the end */
8384                                         if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
8385                                             (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK)) {
8386                                                 /* turn off the timer */
8387                                                 if (SCTP_OS_TIMER_PENDING(&stcb->asoc.dack_timer.timer)) {
8388                                                         sctp_timer_stop(SCTP_TIMER_TYPE_RECV,
8389                                                             inp, stcb, NULL,
8390                                                             SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_1);
8391                                                 }
8392                                         }
8393                                         ctl_cnt++;
8394                                 } else {
8395                                         /*
8396                                          * Other chunks, since they have
8397                                          * timers running (i.e. COOKIE) we
8398                                          * just "trust" that it gets sent or
8399                                          * retransmitted.
8400                                          */
8401                                         ctl_cnt++;
8402                                         if (chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
8403                                                 cookie = 1;
8404                                                 no_out_cnt = 1;
8405                                         } else if (chk->rec.chunk_id.id == SCTP_ECN_ECHO) {
8406                                                 /*
8407                                                  * Increment ecne send count
8408                                                  * here this means we may be
8409                                                  * over-zealous in our
8410                                                  * counting if the send
8411                                                  * fails, but its the best
8412                                                  * place to do it (we used
8413                                                  * to do it in the queue of
8414                                                  * the chunk, but that did
8415                                                  * not tell how many times
8416                                                  * it was sent.
8417                                                  */
8418                                                 SCTP_STAT_INCR(sctps_sendecne);
8419                                         }
8420                                         chk->sent = SCTP_DATAGRAM_SENT;
8421                                         if (chk->whoTo == NULL) {
8422                                                 chk->whoTo = net;
8423                                                 atomic_add_int(&net->ref_count, 1);
8424                                         }
8425                                         chk->snd_count++;
8426                                 }
8427                                 if (mtu == 0) {
8428                                         /*
8429                                          * Ok we are out of room but we can
8430                                          * output without effecting the
8431                                          * flight size since this little guy
8432                                          * is a control only packet.
8433                                          */
8434                                         switch (asoc->snd_edmid) {
8435                                         case SCTP_EDMID_LOWER_LAYER_DTLS:
8436                                                 use_zero_crc = true;
8437                                                 break;
8438                                         default:
8439                                                 use_zero_crc = false;
8440                                                 break;
8441                                         }
8442                                         if (asconf) {
8443                                                 sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp, stcb, net);
8444                                                 use_zero_crc = false;
8445                                                 /*
8446                                                  * do NOT clear the asconf
8447                                                  * flag as it is used to do
8448                                                  * appropriate source
8449                                                  * address selection.
8450                                                  */
8451                                         }
8452                                         if (cookie) {
8453                                                 sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, inp, stcb, net);
8454                                                 use_zero_crc = false;
8455                                                 cookie = 0;
8456                                         }
8457                                         /* Only HB or ASCONF advances time */
8458                                         if (hbflag) {
8459                                                 if (*now_filled == 0) {
8460                                                         (void)SCTP_GETTIME_TIMEVAL(now);
8461                                                         *now_filled = 1;
8462                                                 }
8463                                                 net->last_sent_time = *now;
8464                                                 hbflag = 0;
8465                                         }
8466                                         if ((error = sctp_lowlevel_chunk_output(inp, stcb, net,
8467                                             (struct sockaddr *)&net->ro._l_addr,
8468                                             outchain,
8469                                             auth_offset, auth,
8470                                             stcb->asoc.authinfo.active_keyid,
8471                                             no_fragmentflg, 0, asconf,
8472                                             inp->sctp_lport, stcb->rport,
8473                                             htonl(stcb->asoc.peer_vtag),
8474                                             net->port, NULL,
8475                                             0, 0,
8476                                             use_zero_crc, so_locked))) {
8477                                                 /*
8478                                                  * error, we could not
8479                                                  * output
8480                                                  */
8481                                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
8482                                                 if (from_where == 0) {
8483                                                         SCTP_STAT_INCR(sctps_lowlevelerrusr);
8484                                                 }
8485                                                 if (error == ENOBUFS) {
8486                                                         asoc->ifp_had_enobuf = 1;
8487                                                         SCTP_STAT_INCR(sctps_lowlevelerr);
8488                                                 }
8489                                                 if (error == EHOSTUNREACH) {
8490                                                         /*
8491                                                          * Destination went
8492                                                          * unreachable
8493                                                          * during this send
8494                                                          */
8495                                                         sctp_move_chunks_from_net(stcb, net);
8496                                                 }
8497                                                 asconf = 0;
8498                                                 *reason_code = 7;
8499                                                 break;
8500                                         } else {
8501                                                 asoc->ifp_had_enobuf = 0;
8502                                         }
8503                                         /*
8504                                          * increase the number we sent, if a
8505                                          * cookie is sent we don't tell them
8506                                          * any was sent out.
8507                                          */
8508                                         outchain = endoutchain = NULL;
8509                                         auth = NULL;
8510                                         auth_offset = 0;
8511                                         asconf = 0;
8512                                         if (!no_out_cnt)
8513                                                 *num_out += ctl_cnt;
8514                                         /* recalc a clean slate and setup */
8515                                         switch (net->ro._l_addr.sa.sa_family) {
8516 #ifdef INET
8517                                         case AF_INET:
8518                                                 mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
8519                                                 break;
8520 #endif
8521 #ifdef INET6
8522                                         case AF_INET6:
8523                                                 mtu = net->mtu - SCTP_MIN_OVERHEAD;
8524                                                 break;
8525 #endif
8526                                         default:
8527                                                 /* TSNH */
8528                                                 mtu = net->mtu;
8529                                                 break;
8530                                         }
8531                                         to_out = 0;
8532                                         no_fragmentflg = 1;
8533                                 }
8534                         }
8535                 }
8536                 if (error != 0) {
8537                         /* try next net */
8538                         continue;
8539                 }
8540                 /* JRI: if dest is in PF state, do not send data to it */
8541                 if ((asoc->sctp_cmt_on_off > 0) &&
8542                     (net != stcb->asoc.alternate) &&
8543                     (net->dest_state & SCTP_ADDR_PF)) {
8544                         goto no_data_fill;
8545                 }
8546                 if (net->flight_size >= net->cwnd) {
8547                         goto no_data_fill;
8548                 }
8549                 if ((asoc->sctp_cmt_on_off > 0) &&
8550                     (SCTP_BASE_SYSCTL(sctp_buffer_splitting) & SCTP_RECV_BUFFER_SPLITTING) &&
8551                     (net->flight_size > max_rwnd_per_dest)) {
8552                         goto no_data_fill;
8553                 }
8554                 /*
8555                  * We need a specific accounting for the usage of the send
8556                  * buffer. We also need to check the number of messages per
8557                  * net. For now, this is better than nothing and it disabled
8558                  * by default...
8559                  */
8560                 if ((asoc->sctp_cmt_on_off > 0) &&
8561                     (SCTP_BASE_SYSCTL(sctp_buffer_splitting) & SCTP_SEND_BUFFER_SPLITTING) &&
8562                     (max_send_per_dest > 0) &&
8563                     (net->flight_size > max_send_per_dest)) {
8564                         goto no_data_fill;
8565                 }
8566                 /*********************/
8567                 /* Data transmission */
8568                 /*********************/
8569                 /*
8570                  * if AUTH for DATA is required and no AUTH has been added
8571                  * yet, account for this in the mtu now... if no data can be
8572                  * bundled, this adjustment won't matter anyways since the
8573                  * packet will be going out...
8574                  */
8575                 data_auth_reqd = sctp_auth_is_required_chunk(SCTP_DATA,
8576                     stcb->asoc.peer_auth_chunks);
8577                 if (data_auth_reqd && (auth == NULL)) {
8578                         mtu -= sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
8579                 }
8580                 /* now lets add any data within the MTU constraints */
8581                 switch (((struct sockaddr *)&net->ro._l_addr)->sa_family) {
8582 #ifdef INET
8583                 case AF_INET:
8584                         if (net->mtu > SCTP_MIN_V4_OVERHEAD)
8585                                 omtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
8586                         else
8587                                 omtu = 0;
8588                         break;
8589 #endif
8590 #ifdef INET6
8591                 case AF_INET6:
8592                         if (net->mtu > SCTP_MIN_OVERHEAD)
8593                                 omtu = net->mtu - SCTP_MIN_OVERHEAD;
8594                         else
8595                                 omtu = 0;
8596                         break;
8597 #endif
8598                 default:
8599                         /* TSNH */
8600                         omtu = 0;
8601                         break;
8602                 }
8603                 if ((((SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) ||
8604                     (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_RECEIVED)) &&
8605                     (skip_data_for_this_net == 0)) ||
8606                     (cookie)) {
8607                         TAILQ_FOREACH_SAFE(chk, &asoc->send_queue, sctp_next, nchk) {
8608                                 if (no_data_chunks) {
8609                                         /* let only control go out */
8610                                         *reason_code = 1;
8611                                         break;
8612                                 }
8613                                 if (net->flight_size >= net->cwnd) {
8614                                         /* skip this net, no room for data */
8615                                         *reason_code = 2;
8616                                         break;
8617                                 }
8618                                 if ((chk->whoTo != NULL) &&
8619                                     (chk->whoTo != net)) {
8620                                         /* Don't send the chunk on this net */
8621                                         continue;
8622                                 }
8623
8624                                 if (asoc->sctp_cmt_on_off == 0) {
8625                                         if ((asoc->alternate) &&
8626                                             (asoc->alternate != net) &&
8627                                             (chk->whoTo == NULL)) {
8628                                                 continue;
8629                                         } else if ((net != asoc->primary_destination) &&
8630                                                     (asoc->alternate == NULL) &&
8631                                             (chk->whoTo == NULL)) {
8632                                                 continue;
8633                                         }
8634                                 }
8635                                 if ((chk->send_size > omtu) && ((chk->flags & CHUNK_FLAGS_FRAGMENT_OK) == 0)) {
8636                                         /*-
8637                                          * strange, we have a chunk that is
8638                                          * to big for its destination and
8639                                          * yet no fragment ok flag.
8640                                          * Something went wrong when the
8641                                          * PMTU changed...we did not mark
8642                                          * this chunk for some reason?? I
8643                                          * will fix it here by letting IP
8644                                          * fragment it for now and printing
8645                                          * a warning. This really should not
8646                                          * happen ...
8647                                          */
8648                                         SCTP_PRINTF("Warning chunk of %d bytes > mtu:%d and yet PMTU disc missed\n",
8649                                             chk->send_size, mtu);
8650                                         chk->flags |= CHUNK_FLAGS_FRAGMENT_OK;
8651                                 }
8652                                 if (SCTP_BASE_SYSCTL(sctp_enable_sack_immediately) &&
8653                                     (asoc->state & SCTP_STATE_SHUTDOWN_PENDING)) {
8654                                         struct sctp_data_chunk *dchkh;
8655
8656                                         dchkh = mtod(chk->data, struct sctp_data_chunk *);
8657                                         dchkh->ch.chunk_flags |= SCTP_DATA_SACK_IMMEDIATELY;
8658                                 }
8659                                 if (((chk->send_size <= mtu) && (chk->send_size <= r_mtu)) ||
8660                                     ((chk->flags & CHUNK_FLAGS_FRAGMENT_OK) && (chk->send_size <= asoc->peers_rwnd))) {
8661                                         /* ok we will add this one */
8662
8663                                         /*
8664                                          * Add an AUTH chunk, if chunk
8665                                          * requires it, save the offset into
8666                                          * the chain for AUTH
8667                                          */
8668                                         if (data_auth_reqd) {
8669                                                 if (auth == NULL) {
8670                                                         outchain = sctp_add_auth_chunk(outchain,
8671                                                             &endoutchain,
8672                                                             &auth,
8673                                                             &auth_offset,
8674                                                             stcb,
8675                                                             SCTP_DATA);
8676                                                         auth_keyid = chk->auth_keyid;
8677                                                         override_ok = 0;
8678                                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8679                                                 } else if (override_ok) {
8680                                                         /*
8681                                                          * use this data's
8682                                                          * keyid
8683                                                          */
8684                                                         auth_keyid = chk->auth_keyid;
8685                                                         override_ok = 0;
8686                                                 } else if (auth_keyid != chk->auth_keyid) {
8687                                                         /*
8688                                                          * different keyid,
8689                                                          * so done bundling
8690                                                          */
8691                                                         break;
8692                                                 }
8693                                         }
8694                                         outchain = sctp_copy_mbufchain(chk->data, outchain, &endoutchain, 0,
8695                                             chk->send_size, chk->copy_by_ref);
8696                                         if (outchain == NULL) {
8697                                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "No memory?\n");
8698                                                 if (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
8699                                                         sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
8700                                                 }
8701                                                 *reason_code = 3;
8702                                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
8703                                                 return (ENOMEM);
8704                                         }
8705                                         /* update our MTU size */
8706                                         /* Do clear IP_DF ? */
8707                                         if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
8708                                                 no_fragmentflg = 0;
8709                                         }
8710                                         /* unsigned subtraction of mtu */
8711                                         if (mtu > chk->send_size)
8712                                                 mtu -= chk->send_size;
8713                                         else
8714                                                 mtu = 0;
8715                                         /* unsigned subtraction of r_mtu */
8716                                         if (r_mtu > chk->send_size)
8717                                                 r_mtu -= chk->send_size;
8718                                         else
8719                                                 r_mtu = 0;
8720
8721                                         to_out += chk->send_size;
8722                                         if ((to_out > mx_mtu) && no_fragmentflg) {
8723 #ifdef INVARIANTS
8724                                                 panic("Exceeding mtu of %d out size is %d", mx_mtu, to_out);
8725 #else
8726                                                 SCTP_PRINTF("Exceeding mtu of %d out size is %d\n",
8727                                                     mx_mtu, to_out);
8728 #endif
8729                                         }
8730                                         chk->window_probe = 0;
8731                                         data_list[bundle_at++] = chk;
8732                                         if (bundle_at >= SCTP_MAX_DATA_BUNDLING) {
8733                                                 break;
8734                                         }
8735                                         if (chk->sent == SCTP_DATAGRAM_UNSENT) {
8736                                                 if ((chk->rec.data.rcv_flags & SCTP_DATA_UNORDERED) == 0) {
8737                                                         SCTP_STAT_INCR_COUNTER64(sctps_outorderchunks);
8738                                                 } else {
8739                                                         SCTP_STAT_INCR_COUNTER64(sctps_outunorderchunks);
8740                                                 }
8741                                                 if (((chk->rec.data.rcv_flags & SCTP_DATA_LAST_FRAG) == SCTP_DATA_LAST_FRAG) &&
8742                                                     ((chk->rec.data.rcv_flags & SCTP_DATA_FIRST_FRAG) == 0))
8743                                                         /*
8744                                                          * Count number of
8745                                                          * user msg's that
8746                                                          * were fragmented
8747                                                          * we do this by
8748                                                          * counting when we
8749                                                          * see a LAST
8750                                                          * fragment only.
8751                                                          */
8752                                                         SCTP_STAT_INCR_COUNTER64(sctps_fragusrmsgs);
8753                                         }
8754                                         if ((mtu == 0) || (r_mtu == 0) || (one_chunk)) {
8755                                                 if ((one_chunk) && (stcb->asoc.total_flight == 0)) {
8756                                                         data_list[0]->window_probe = 1;
8757                                                         net->window_probe = 1;
8758                                                 }
8759                                                 break;
8760                                         }
8761                                 } else {
8762                                         /*
8763                                          * Must be sent in order of the
8764                                          * TSN's (on a network)
8765                                          */
8766                                         break;
8767                                 }
8768                         }       /* for (chunk gather loop for this net) */
8769                 }               /* if asoc.state OPEN */
8770 no_data_fill:
8771                 /* Is there something to send for this destination? */
8772                 if (outchain) {
8773                         switch (asoc->snd_edmid) {
8774                         case SCTP_EDMID_LOWER_LAYER_DTLS:
8775                                 use_zero_crc = true;
8776                                 break;
8777                         default:
8778                                 use_zero_crc = false;
8779                                 break;
8780                         }
8781                         /* We may need to start a control timer or two */
8782                         if (asconf) {
8783                                 sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp,
8784                                     stcb, net);
8785                                 use_zero_crc = false;
8786                                 /*
8787                                  * do NOT clear the asconf flag as it is
8788                                  * used to do appropriate source address
8789                                  * selection.
8790                                  */
8791                         }
8792                         if (cookie) {
8793                                 sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, inp, stcb, net);
8794                                 use_zero_crc = false;
8795                                 cookie = 0;
8796                         }
8797                         /* must start a send timer if data is being sent */
8798                         if (bundle_at && (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer))) {
8799                                 /*
8800                                  * no timer running on this destination
8801                                  * restart it.
8802                                  */
8803                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
8804                         }
8805                         if (bundle_at || hbflag) {
8806                                 /* For data/asconf and hb set time */
8807                                 if (*now_filled == 0) {
8808                                         (void)SCTP_GETTIME_TIMEVAL(now);
8809                                         *now_filled = 1;
8810                                 }
8811                                 net->last_sent_time = *now;
8812                         }
8813                         /* Now send it, if there is anything to send :> */
8814                         if ((error = sctp_lowlevel_chunk_output(inp,
8815                             stcb,
8816                             net,
8817                             (struct sockaddr *)&net->ro._l_addr,
8818                             outchain,
8819                             auth_offset,
8820                             auth,
8821                             auth_keyid,
8822                             no_fragmentflg,
8823                             bundle_at,
8824                             asconf,
8825                             inp->sctp_lport, stcb->rport,
8826                             htonl(stcb->asoc.peer_vtag),
8827                             net->port, NULL,
8828                             0, 0,
8829                             use_zero_crc,
8830                             so_locked))) {
8831                                 /* error, we could not output */
8832                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
8833                                 if (from_where == 0) {
8834                                         SCTP_STAT_INCR(sctps_lowlevelerrusr);
8835                                 }
8836                                 if (error == ENOBUFS) {
8837                                         asoc->ifp_had_enobuf = 1;
8838                                         SCTP_STAT_INCR(sctps_lowlevelerr);
8839                                 }
8840                                 if (error == EHOSTUNREACH) {
8841                                         /*
8842                                          * Destination went unreachable
8843                                          * during this send
8844                                          */
8845                                         sctp_move_chunks_from_net(stcb, net);
8846                                 }
8847                                 asconf = 0;
8848                                 *reason_code = 6;
8849                                 /*-
8850                                  * I add this line to be paranoid. As far as
8851                                  * I can tell the continue, takes us back to
8852                                  * the top of the for, but just to make sure
8853                                  * I will reset these again here.
8854                                  */
8855                                 ctl_cnt = 0;
8856                                 continue;       /* This takes us back to the
8857                                                  * for() for the nets. */
8858                         } else {
8859                                 asoc->ifp_had_enobuf = 0;
8860                         }
8861                         endoutchain = NULL;
8862                         auth = NULL;
8863                         auth_offset = 0;
8864                         asconf = 0;
8865                         if (!no_out_cnt) {
8866                                 *num_out += (ctl_cnt + bundle_at);
8867                         }
8868                         if (bundle_at) {
8869                                 /* setup for a RTO measurement */
8870                                 tsns_sent = data_list[0]->rec.data.tsn;
8871                                 /* fill time if not already filled */
8872                                 if (*now_filled == 0) {
8873                                         (void)SCTP_GETTIME_TIMEVAL(&asoc->time_last_sent);
8874                                         *now_filled = 1;
8875                                         *now = asoc->time_last_sent;
8876                                 } else {
8877                                         asoc->time_last_sent = *now;
8878                                 }
8879                                 if (net->rto_needed) {
8880                                         data_list[0]->do_rtt = 1;
8881                                         net->rto_needed = 0;
8882                                 }
8883                                 SCTP_STAT_INCR_BY(sctps_senddata, bundle_at);
8884                                 sctp_clean_up_datalist(stcb, asoc, data_list, bundle_at, net);
8885                         }
8886                         if (one_chunk) {
8887                                 break;
8888                         }
8889                 }
8890                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
8891                         sctp_log_cwnd(stcb, net, tsns_sent, SCTP_CWND_LOG_FROM_SEND);
8892                 }
8893         }
8894         if (old_start_at == NULL) {
8895                 old_start_at = start_at;
8896                 start_at = TAILQ_FIRST(&asoc->nets);
8897                 if (old_start_at)
8898                         goto again_one_more_time;
8899         }
8900
8901         /*
8902          * At the end there should be no NON timed chunks hanging on this
8903          * queue.
8904          */
8905         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
8906                 sctp_log_cwnd(stcb, net, *num_out, SCTP_CWND_LOG_FROM_SEND);
8907         }
8908         if ((*num_out == 0) && (*reason_code == 0)) {
8909                 *reason_code = 4;
8910         } else {
8911                 *reason_code = 5;
8912         }
8913         sctp_clean_up_ctl(stcb, asoc, so_locked);
8914         return (0);
8915 }
8916
8917 void
8918 sctp_queue_op_err(struct sctp_tcb *stcb, struct mbuf *op_err)
8919 {
8920         /*-
8921          * Prepend a OPERATIONAL_ERROR chunk header and put on the end of
8922          * the control chunk queue.
8923          */
8924         struct sctp_chunkhdr *hdr;
8925         struct sctp_tmit_chunk *chk;
8926         struct mbuf *mat, *last_mbuf;
8927         uint32_t chunk_length;
8928         uint16_t padding_length;
8929
8930         SCTP_TCB_LOCK_ASSERT(stcb);
8931         SCTP_BUF_PREPEND(op_err, sizeof(struct sctp_chunkhdr), M_NOWAIT);
8932         if (op_err == NULL) {
8933                 return;
8934         }
8935         last_mbuf = NULL;
8936         chunk_length = 0;
8937         for (mat = op_err; mat != NULL; mat = SCTP_BUF_NEXT(mat)) {
8938                 chunk_length += SCTP_BUF_LEN(mat);
8939                 if (SCTP_BUF_NEXT(mat) == NULL) {
8940                         last_mbuf = mat;
8941                 }
8942         }
8943         if (chunk_length > SCTP_MAX_CHUNK_LENGTH) {
8944                 sctp_m_freem(op_err);
8945                 return;
8946         }
8947         padding_length = chunk_length % 4;
8948         if (padding_length != 0) {
8949                 padding_length = 4 - padding_length;
8950         }
8951         if (padding_length != 0) {
8952                 if (sctp_add_pad_tombuf(last_mbuf, padding_length) == NULL) {
8953                         sctp_m_freem(op_err);
8954                         return;
8955                 }
8956         }
8957         sctp_alloc_a_chunk(stcb, chk);
8958         if (chk == NULL) {
8959                 /* no memory */
8960                 sctp_m_freem(op_err);
8961                 return;
8962         }
8963         chk->copy_by_ref = 0;
8964         chk->rec.chunk_id.id = SCTP_OPERATION_ERROR;
8965         chk->rec.chunk_id.can_take_data = 0;
8966         chk->flags = 0;
8967         chk->send_size = (uint16_t)chunk_length;
8968         chk->sent = SCTP_DATAGRAM_UNSENT;
8969         chk->snd_count = 0;
8970         chk->asoc = &stcb->asoc;
8971         chk->data = op_err;
8972         chk->whoTo = NULL;
8973         hdr = mtod(op_err, struct sctp_chunkhdr *);
8974         hdr->chunk_type = SCTP_OPERATION_ERROR;
8975         hdr->chunk_flags = 0;
8976         hdr->chunk_length = htons(chk->send_size);
8977         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
8978         chk->asoc->ctrl_queue_cnt++;
8979 }
8980
8981 int
8982 sctp_send_cookie_echo(struct mbuf *m,
8983     int offset, int limit,
8984     struct sctp_tcb *stcb,
8985     struct sctp_nets *net)
8986 {
8987         /*-
8988          * pull out the cookie and put it at the front of the control chunk
8989          * queue.
8990          */
8991         int at;
8992         struct mbuf *cookie;
8993         struct sctp_paramhdr param, *phdr;
8994         struct sctp_chunkhdr *hdr;
8995         struct sctp_tmit_chunk *chk;
8996         uint16_t ptype, plen;
8997
8998         SCTP_TCB_LOCK_ASSERT(stcb);
8999         /* First find the cookie in the param area */
9000         cookie = NULL;
9001         at = offset + sizeof(struct sctp_init_chunk);
9002         for (;;) {
9003                 phdr = sctp_get_next_param(m, at, &param, sizeof(param));
9004                 if (phdr == NULL) {
9005                         return (-3);
9006                 }
9007                 ptype = ntohs(phdr->param_type);
9008                 plen = ntohs(phdr->param_length);
9009                 if (plen < sizeof(struct sctp_paramhdr)) {
9010                         return (-6);
9011                 }
9012                 if (ptype == SCTP_STATE_COOKIE) {
9013                         int pad;
9014
9015                         /* found the cookie */
9016                         if (at + plen > limit) {
9017                                 return (-7);
9018                         }
9019                         cookie = SCTP_M_COPYM(m, at, plen, M_NOWAIT);
9020                         if (cookie == NULL) {
9021                                 /* No memory */
9022                                 return (-2);
9023                         }
9024                         if ((pad = (plen % 4)) > 0) {
9025                                 pad = 4 - pad;
9026                         }
9027                         if (pad > 0) {
9028                                 if (sctp_pad_lastmbuf(cookie, pad, NULL) == NULL) {
9029                                         return (-8);
9030                                 }
9031                         }
9032 #ifdef SCTP_MBUF_LOGGING
9033                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
9034                                 sctp_log_mbc(cookie, SCTP_MBUF_ICOPY);
9035                         }
9036 #endif
9037                         break;
9038                 }
9039                 at += SCTP_SIZE32(plen);
9040         }
9041         /* ok, we got the cookie lets change it into a cookie echo chunk */
9042         /* first the change from param to cookie */
9043         hdr = mtod(cookie, struct sctp_chunkhdr *);
9044         hdr->chunk_type = SCTP_COOKIE_ECHO;
9045         hdr->chunk_flags = 0;
9046         /* get the chunk stuff now and place it in the FRONT of the queue */
9047         sctp_alloc_a_chunk(stcb, chk);
9048         if (chk == NULL) {
9049                 /* no memory */
9050                 sctp_m_freem(cookie);
9051                 return (-5);
9052         }
9053         chk->copy_by_ref = 0;
9054         chk->rec.chunk_id.id = SCTP_COOKIE_ECHO;
9055         chk->rec.chunk_id.can_take_data = 0;
9056         chk->flags = CHUNK_FLAGS_FRAGMENT_OK;
9057         chk->send_size = SCTP_SIZE32(plen);
9058         chk->sent = SCTP_DATAGRAM_UNSENT;
9059         chk->snd_count = 0;
9060         chk->asoc = &stcb->asoc;
9061         chk->data = cookie;
9062         chk->whoTo = net;
9063         atomic_add_int(&chk->whoTo->ref_count, 1);
9064         TAILQ_INSERT_HEAD(&chk->asoc->control_send_queue, chk, sctp_next);
9065         chk->asoc->ctrl_queue_cnt++;
9066         return (0);
9067 }
9068
9069 void
9070 sctp_send_heartbeat_ack(struct sctp_tcb *stcb,
9071     struct mbuf *m,
9072     int offset,
9073     int chk_length,
9074     struct sctp_nets *net)
9075 {
9076         /*
9077          * take a HB request and make it into a HB ack and send it.
9078          */
9079         struct mbuf *outchain;
9080         struct sctp_chunkhdr *chdr;
9081         struct sctp_tmit_chunk *chk;
9082
9083         if (net == NULL)
9084                 /* must have a net pointer */
9085                 return;
9086
9087         outchain = SCTP_M_COPYM(m, offset, chk_length, M_NOWAIT);
9088         if (outchain == NULL) {
9089                 /* gak out of memory */
9090                 return;
9091         }
9092 #ifdef SCTP_MBUF_LOGGING
9093         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
9094                 sctp_log_mbc(outchain, SCTP_MBUF_ICOPY);
9095         }
9096 #endif
9097         chdr = mtod(outchain, struct sctp_chunkhdr *);
9098         chdr->chunk_type = SCTP_HEARTBEAT_ACK;
9099         chdr->chunk_flags = 0;
9100         if (chk_length % 4 != 0) {
9101                 sctp_pad_lastmbuf(outchain, 4 - (chk_length % 4), NULL);
9102         }
9103         sctp_alloc_a_chunk(stcb, chk);
9104         if (chk == NULL) {
9105                 /* no memory */
9106                 sctp_m_freem(outchain);
9107                 return;
9108         }
9109         chk->copy_by_ref = 0;
9110         chk->rec.chunk_id.id = SCTP_HEARTBEAT_ACK;
9111         chk->rec.chunk_id.can_take_data = 1;
9112         chk->flags = 0;
9113         chk->send_size = chk_length;
9114         chk->sent = SCTP_DATAGRAM_UNSENT;
9115         chk->snd_count = 0;
9116         chk->asoc = &stcb->asoc;
9117         chk->data = outchain;
9118         chk->whoTo = net;
9119         atomic_add_int(&chk->whoTo->ref_count, 1);
9120         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9121         chk->asoc->ctrl_queue_cnt++;
9122 }
9123
9124 void
9125 sctp_send_cookie_ack(struct sctp_tcb *stcb)
9126 {
9127         /* formulate and queue a cookie-ack back to sender */
9128         struct mbuf *cookie_ack;
9129         struct sctp_chunkhdr *hdr;
9130         struct sctp_tmit_chunk *chk;
9131
9132         SCTP_TCB_LOCK_ASSERT(stcb);
9133
9134         cookie_ack = sctp_get_mbuf_for_msg(sizeof(struct sctp_chunkhdr), 0, M_NOWAIT, 1, MT_HEADER);
9135         if (cookie_ack == NULL) {
9136                 /* no mbuf's */
9137                 return;
9138         }
9139         SCTP_BUF_RESV_UF(cookie_ack, SCTP_MIN_OVERHEAD);
9140         sctp_alloc_a_chunk(stcb, chk);
9141         if (chk == NULL) {
9142                 /* no memory */
9143                 sctp_m_freem(cookie_ack);
9144                 return;
9145         }
9146         chk->copy_by_ref = 0;
9147         chk->rec.chunk_id.id = SCTP_COOKIE_ACK;
9148         chk->rec.chunk_id.can_take_data = 1;
9149         chk->flags = 0;
9150         chk->send_size = sizeof(struct sctp_chunkhdr);
9151         chk->sent = SCTP_DATAGRAM_UNSENT;
9152         chk->snd_count = 0;
9153         chk->asoc = &stcb->asoc;
9154         chk->data = cookie_ack;
9155         if (chk->asoc->last_control_chunk_from != NULL) {
9156                 chk->whoTo = chk->asoc->last_control_chunk_from;
9157                 atomic_add_int(&chk->whoTo->ref_count, 1);
9158         } else {
9159                 chk->whoTo = NULL;
9160         }
9161         hdr = mtod(cookie_ack, struct sctp_chunkhdr *);
9162         hdr->chunk_type = SCTP_COOKIE_ACK;
9163         hdr->chunk_flags = 0;
9164         hdr->chunk_length = htons(chk->send_size);
9165         SCTP_BUF_LEN(cookie_ack) = chk->send_size;
9166         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9167         chk->asoc->ctrl_queue_cnt++;
9168         return;
9169 }
9170
9171 void
9172 sctp_send_shutdown_ack(struct sctp_tcb *stcb, struct sctp_nets *net)
9173 {
9174         /* formulate and queue a SHUTDOWN-ACK back to the sender */
9175         struct mbuf *m_shutdown_ack;
9176         struct sctp_shutdown_ack_chunk *ack_cp;
9177         struct sctp_tmit_chunk *chk;
9178
9179         m_shutdown_ack = sctp_get_mbuf_for_msg(sizeof(struct sctp_shutdown_ack_chunk), 0, M_NOWAIT, 1, MT_HEADER);
9180         if (m_shutdown_ack == NULL) {
9181                 /* no mbuf's */
9182                 return;
9183         }
9184         SCTP_BUF_RESV_UF(m_shutdown_ack, SCTP_MIN_OVERHEAD);
9185         sctp_alloc_a_chunk(stcb, chk);
9186         if (chk == NULL) {
9187                 /* no memory */
9188                 sctp_m_freem(m_shutdown_ack);
9189                 return;
9190         }
9191         chk->copy_by_ref = 0;
9192         chk->rec.chunk_id.id = SCTP_SHUTDOWN_ACK;
9193         chk->rec.chunk_id.can_take_data = 1;
9194         chk->flags = 0;
9195         chk->send_size = sizeof(struct sctp_chunkhdr);
9196         chk->sent = SCTP_DATAGRAM_UNSENT;
9197         chk->snd_count = 0;
9198         chk->asoc = &stcb->asoc;
9199         chk->data = m_shutdown_ack;
9200         chk->whoTo = net;
9201         if (chk->whoTo) {
9202                 atomic_add_int(&chk->whoTo->ref_count, 1);
9203         }
9204         ack_cp = mtod(m_shutdown_ack, struct sctp_shutdown_ack_chunk *);
9205         ack_cp->ch.chunk_type = SCTP_SHUTDOWN_ACK;
9206         ack_cp->ch.chunk_flags = 0;
9207         ack_cp->ch.chunk_length = htons(chk->send_size);
9208         SCTP_BUF_LEN(m_shutdown_ack) = chk->send_size;
9209         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9210         chk->asoc->ctrl_queue_cnt++;
9211         return;
9212 }
9213
9214 void
9215 sctp_send_shutdown(struct sctp_tcb *stcb, struct sctp_nets *net)
9216 {
9217         /* formulate and queue a SHUTDOWN to the sender */
9218         struct mbuf *m_shutdown;
9219         struct sctp_shutdown_chunk *shutdown_cp;
9220         struct sctp_tmit_chunk *chk;
9221
9222         TAILQ_FOREACH(chk, &stcb->asoc.control_send_queue, sctp_next) {
9223                 if (chk->rec.chunk_id.id == SCTP_SHUTDOWN) {
9224                         /* We already have a SHUTDOWN queued. Reuse it. */
9225                         if (chk->whoTo) {
9226                                 sctp_free_remote_addr(chk->whoTo);
9227                                 chk->whoTo = NULL;
9228                         }
9229                         break;
9230                 }
9231         }
9232         if (chk == NULL) {
9233                 m_shutdown = sctp_get_mbuf_for_msg(sizeof(struct sctp_shutdown_chunk), 0, M_NOWAIT, 1, MT_HEADER);
9234                 if (m_shutdown == NULL) {
9235                         /* no mbuf's */
9236                         return;
9237                 }
9238                 SCTP_BUF_RESV_UF(m_shutdown, SCTP_MIN_OVERHEAD);
9239                 sctp_alloc_a_chunk(stcb, chk);
9240                 if (chk == NULL) {
9241                         /* no memory */
9242                         sctp_m_freem(m_shutdown);
9243                         return;
9244                 }
9245                 chk->copy_by_ref = 0;
9246                 chk->rec.chunk_id.id = SCTP_SHUTDOWN;
9247                 chk->rec.chunk_id.can_take_data = 1;
9248                 chk->flags = 0;
9249                 chk->send_size = sizeof(struct sctp_shutdown_chunk);
9250                 chk->sent = SCTP_DATAGRAM_UNSENT;
9251                 chk->snd_count = 0;
9252                 chk->asoc = &stcb->asoc;
9253                 chk->data = m_shutdown;
9254                 chk->whoTo = net;
9255                 if (chk->whoTo) {
9256                         atomic_add_int(&chk->whoTo->ref_count, 1);
9257                 }
9258                 shutdown_cp = mtod(m_shutdown, struct sctp_shutdown_chunk *);
9259                 shutdown_cp->ch.chunk_type = SCTP_SHUTDOWN;
9260                 shutdown_cp->ch.chunk_flags = 0;
9261                 shutdown_cp->ch.chunk_length = htons(chk->send_size);
9262                 shutdown_cp->cumulative_tsn_ack = htonl(stcb->asoc.cumulative_tsn);
9263                 SCTP_BUF_LEN(m_shutdown) = chk->send_size;
9264                 TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9265                 chk->asoc->ctrl_queue_cnt++;
9266         } else {
9267                 TAILQ_REMOVE(&stcb->asoc.control_send_queue, chk, sctp_next);
9268                 chk->whoTo = net;
9269                 if (chk->whoTo) {
9270                         atomic_add_int(&chk->whoTo->ref_count, 1);
9271                 }
9272                 shutdown_cp = mtod(chk->data, struct sctp_shutdown_chunk *);
9273                 shutdown_cp->cumulative_tsn_ack = htonl(stcb->asoc.cumulative_tsn);
9274                 TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
9275         }
9276         return;
9277 }
9278
9279 void
9280 sctp_send_asconf(struct sctp_tcb *stcb, struct sctp_nets *net, int addr_locked)
9281 {
9282         /*
9283          * formulate and queue an ASCONF to the peer. ASCONF parameters
9284          * should be queued on the assoc queue.
9285          */
9286         struct sctp_tmit_chunk *chk;
9287         struct mbuf *m_asconf;
9288         int len;
9289
9290         SCTP_TCB_LOCK_ASSERT(stcb);
9291
9292         if ((!TAILQ_EMPTY(&stcb->asoc.asconf_send_queue)) &&
9293             (!sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_MULTIPLE_ASCONFS))) {
9294                 /* can't send a new one if there is one in flight already */
9295                 return;
9296         }
9297
9298         /* compose an ASCONF chunk, maximum length is PMTU */
9299         m_asconf = sctp_compose_asconf(stcb, &len, addr_locked);
9300         if (m_asconf == NULL) {
9301                 return;
9302         }
9303
9304         sctp_alloc_a_chunk(stcb, chk);
9305         if (chk == NULL) {
9306                 /* no memory */
9307                 sctp_m_freem(m_asconf);
9308                 return;
9309         }
9310
9311         chk->copy_by_ref = 0;
9312         chk->rec.chunk_id.id = SCTP_ASCONF;
9313         chk->rec.chunk_id.can_take_data = 0;
9314         chk->flags = CHUNK_FLAGS_FRAGMENT_OK;
9315         chk->data = m_asconf;
9316         chk->send_size = len;
9317         chk->sent = SCTP_DATAGRAM_UNSENT;
9318         chk->snd_count = 0;
9319         chk->asoc = &stcb->asoc;
9320         chk->whoTo = net;
9321         if (chk->whoTo) {
9322                 atomic_add_int(&chk->whoTo->ref_count, 1);
9323         }
9324         TAILQ_INSERT_TAIL(&chk->asoc->asconf_send_queue, chk, sctp_next);
9325         chk->asoc->ctrl_queue_cnt++;
9326         return;
9327 }
9328
9329 void
9330 sctp_send_asconf_ack(struct sctp_tcb *stcb)
9331 {
9332         /*
9333          * formulate and queue a asconf-ack back to sender. the asconf-ack
9334          * must be stored in the tcb.
9335          */
9336         struct sctp_tmit_chunk *chk;
9337         struct sctp_asconf_ack *ack, *latest_ack;
9338         struct mbuf *m_ack;
9339         struct sctp_nets *net = NULL;
9340
9341         SCTP_TCB_LOCK_ASSERT(stcb);
9342         /* Get the latest ASCONF-ACK */
9343         latest_ack = TAILQ_LAST(&stcb->asoc.asconf_ack_sent, sctp_asconf_ackhead);
9344         if (latest_ack == NULL) {
9345                 return;
9346         }
9347         if (latest_ack->last_sent_to != NULL &&
9348             latest_ack->last_sent_to == stcb->asoc.last_control_chunk_from) {
9349                 /* we're doing a retransmission */
9350                 net = sctp_find_alternate_net(stcb, stcb->asoc.last_control_chunk_from, 0);
9351                 if (net == NULL) {
9352                         /* no alternate */
9353                         if (stcb->asoc.last_control_chunk_from == NULL) {
9354                                 if (stcb->asoc.alternate) {
9355                                         net = stcb->asoc.alternate;
9356                                 } else {
9357                                         net = stcb->asoc.primary_destination;
9358                                 }
9359                         } else {
9360                                 net = stcb->asoc.last_control_chunk_from;
9361                         }
9362                 }
9363         } else {
9364                 /* normal case */
9365                 if (stcb->asoc.last_control_chunk_from == NULL) {
9366                         if (stcb->asoc.alternate) {
9367                                 net = stcb->asoc.alternate;
9368                         } else {
9369                                 net = stcb->asoc.primary_destination;
9370                         }
9371                 } else {
9372                         net = stcb->asoc.last_control_chunk_from;
9373                 }
9374         }
9375         latest_ack->last_sent_to = net;
9376
9377         TAILQ_FOREACH(ack, &stcb->asoc.asconf_ack_sent, next) {
9378                 if (ack->data == NULL) {
9379                         continue;
9380                 }
9381
9382                 /* copy the asconf_ack */
9383                 m_ack = SCTP_M_COPYM(ack->data, 0, M_COPYALL, M_NOWAIT);
9384                 if (m_ack == NULL) {
9385                         /* couldn't copy it */
9386                         return;
9387                 }
9388 #ifdef SCTP_MBUF_LOGGING
9389                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
9390                         sctp_log_mbc(m_ack, SCTP_MBUF_ICOPY);
9391                 }
9392 #endif
9393
9394                 sctp_alloc_a_chunk(stcb, chk);
9395                 if (chk == NULL) {
9396                         /* no memory */
9397                         if (m_ack)
9398                                 sctp_m_freem(m_ack);
9399                         return;
9400                 }
9401                 chk->copy_by_ref = 0;
9402                 chk->rec.chunk_id.id = SCTP_ASCONF_ACK;
9403                 chk->rec.chunk_id.can_take_data = 1;
9404                 chk->flags = CHUNK_FLAGS_FRAGMENT_OK;
9405                 chk->whoTo = net;
9406                 if (chk->whoTo) {
9407                         atomic_add_int(&chk->whoTo->ref_count, 1);
9408                 }
9409                 chk->data = m_ack;
9410                 chk->send_size = ack->len;
9411                 chk->sent = SCTP_DATAGRAM_UNSENT;
9412                 chk->snd_count = 0;
9413                 chk->asoc = &stcb->asoc;
9414
9415                 TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9416                 chk->asoc->ctrl_queue_cnt++;
9417         }
9418         return;
9419 }
9420
9421 static int
9422 sctp_chunk_retransmission(struct sctp_inpcb *inp,
9423     struct sctp_tcb *stcb,
9424     struct sctp_association *asoc,
9425     int *cnt_out, struct timeval *now, int *now_filled, int *fr_done, int so_locked)
9426 {
9427         /*-
9428          * send out one MTU of retransmission. If fast_retransmit is
9429          * happening we ignore the cwnd. Otherwise we obey the cwnd and
9430          * rwnd. For a Cookie or Asconf in the control chunk queue we
9431          * retransmit them by themselves.
9432          *
9433          * For data chunks we will pick out the lowest TSN's in the sent_queue
9434          * marked for resend and bundle them all together (up to a MTU of
9435          * destination). The address to send to should have been
9436          * selected/changed where the retransmission was marked (i.e. in FR
9437          * or t3-timeout routines).
9438          */
9439         struct sctp_tmit_chunk *data_list[SCTP_MAX_DATA_BUNDLING];
9440         struct sctp_tmit_chunk *chk, *fwd;
9441         struct mbuf *m, *endofchain;
9442         struct sctp_nets *net = NULL;
9443         uint32_t tsns_sent = 0;
9444         int no_fragmentflg, bundle_at;
9445         unsigned int mtu;
9446         int error, i, one_chunk, fwd_tsn, ctl_cnt, tmr_started;
9447         struct sctp_auth_chunk *auth = NULL;
9448         uint32_t auth_offset = 0;
9449         uint16_t auth_keyid;
9450         int override_ok = 1;
9451         int data_auth_reqd = 0;
9452         uint32_t dmtu = 0;
9453         bool use_zero_crc;
9454
9455         SCTP_TCB_LOCK_ASSERT(stcb);
9456         tmr_started = ctl_cnt = 0;
9457         no_fragmentflg = 1;
9458         fwd_tsn = 0;
9459         *cnt_out = 0;
9460         fwd = NULL;
9461         endofchain = m = NULL;
9462         auth_keyid = stcb->asoc.authinfo.active_keyid;
9463 #ifdef SCTP_AUDITING_ENABLED
9464         sctp_audit_log(0xC3, 1);
9465 #endif
9466         if ((TAILQ_EMPTY(&asoc->sent_queue)) &&
9467             (TAILQ_EMPTY(&asoc->control_send_queue))) {
9468                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "SCTP hits empty queue with cnt set to %d?\n",
9469                     asoc->sent_queue_retran_cnt);
9470                 asoc->sent_queue_cnt = 0;
9471                 asoc->sent_queue_cnt_removeable = 0;
9472                 /* send back 0/0 so we enter normal transmission */
9473                 *cnt_out = 0;
9474                 return (0);
9475         }
9476         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
9477                 if ((chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) ||
9478                     (chk->rec.chunk_id.id == SCTP_STREAM_RESET) ||
9479                     (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN)) {
9480                         if (chk->sent != SCTP_DATAGRAM_RESEND) {
9481                                 continue;
9482                         }
9483                         if (chk->rec.chunk_id.id == SCTP_STREAM_RESET) {
9484                                 if (chk != asoc->str_reset) {
9485                                         /*
9486                                          * not eligible for retran if its
9487                                          * not ours
9488                                          */
9489                                         continue;
9490                                 }
9491                         }
9492                         ctl_cnt++;
9493                         if (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN) {
9494                                 fwd_tsn = 1;
9495                         }
9496                         /*
9497                          * Add an AUTH chunk, if chunk requires it save the
9498                          * offset into the chain for AUTH
9499                          */
9500                         if ((auth == NULL) &&
9501                             (sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
9502                             stcb->asoc.peer_auth_chunks))) {
9503                                 m = sctp_add_auth_chunk(m, &endofchain,
9504                                     &auth, &auth_offset,
9505                                     stcb,
9506                                     chk->rec.chunk_id.id);
9507                                 SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
9508                         }
9509                         m = sctp_copy_mbufchain(chk->data, m, &endofchain, 0, chk->send_size, chk->copy_by_ref);
9510                         break;
9511                 }
9512         }
9513         one_chunk = 0;
9514         /* do we have control chunks to retransmit? */
9515         if (m != NULL) {
9516                 /* Start a timer no matter if we succeed or fail */
9517                 switch (asoc->snd_edmid) {
9518                 case SCTP_EDMID_LOWER_LAYER_DTLS:
9519                         use_zero_crc = true;
9520                         break;
9521                 default:
9522                         use_zero_crc = false;
9523                         break;
9524                 }
9525                 if (chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
9526                         sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, inp, stcb, chk->whoTo);
9527                         use_zero_crc = false;
9528                 } else if (chk->rec.chunk_id.id == SCTP_ASCONF) {
9529                         /* XXXMT: Can this happen? */
9530                         sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp, stcb, chk->whoTo);
9531                         use_zero_crc = false;
9532                 }
9533                 chk->snd_count++;       /* update our count */
9534                 if ((error = sctp_lowlevel_chunk_output(inp, stcb, chk->whoTo,
9535                     (struct sockaddr *)&chk->whoTo->ro._l_addr, m,
9536                     auth_offset, auth, stcb->asoc.authinfo.active_keyid,
9537                     no_fragmentflg, 0, 0,
9538                     inp->sctp_lport, stcb->rport, htonl(stcb->asoc.peer_vtag),
9539                     chk->whoTo->port, NULL,
9540                     0, 0,
9541                     use_zero_crc,
9542                     so_locked))) {
9543                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
9544                         if (error == ENOBUFS) {
9545                                 asoc->ifp_had_enobuf = 1;
9546                                 SCTP_STAT_INCR(sctps_lowlevelerr);
9547                         }
9548                         return (error);
9549                 } else {
9550                         asoc->ifp_had_enobuf = 0;
9551                 }
9552                 endofchain = NULL;
9553                 auth = NULL;
9554                 auth_offset = 0;
9555                 /*
9556                  * We don't want to mark the net->sent time here since this
9557                  * we use this for HB and retrans cannot measure RTT
9558                  */
9559                 /* (void)SCTP_GETTIME_TIMEVAL(&chk->whoTo->last_sent_time); */
9560                 *cnt_out += 1;
9561                 chk->sent = SCTP_DATAGRAM_SENT;
9562                 sctp_ucount_decr(stcb->asoc.sent_queue_retran_cnt);
9563                 if (fwd_tsn == 0) {
9564                         return (0);
9565                 } else {
9566                         /* Clean up the fwd-tsn list */
9567                         sctp_clean_up_ctl(stcb, asoc, so_locked);
9568                         return (0);
9569                 }
9570         }
9571         /*
9572          * Ok, it is just data retransmission we need to do or that and a
9573          * fwd-tsn with it all.
9574          */
9575         if (TAILQ_EMPTY(&asoc->sent_queue)) {
9576                 return (SCTP_RETRAN_DONE);
9577         }
9578         if ((SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED) ||
9579             (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_WAIT)) {
9580                 /* not yet open, resend the cookie and that is it */
9581                 return (1);
9582         }
9583 #ifdef SCTP_AUDITING_ENABLED
9584         sctp_auditing(20, inp, stcb, NULL);
9585 #endif
9586         data_auth_reqd = sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks);
9587         TAILQ_FOREACH(chk, &asoc->sent_queue, sctp_next) {
9588                 if (chk->sent != SCTP_DATAGRAM_RESEND) {
9589                         /* No, not sent to this net or not ready for rtx */
9590                         continue;
9591                 }
9592                 if (chk->data == NULL) {
9593                         SCTP_PRINTF("TSN:%x chk->snd_count:%d chk->sent:%d can't retran - no data\n",
9594                             chk->rec.data.tsn, chk->snd_count, chk->sent);
9595                         continue;
9596                 }
9597                 if ((SCTP_BASE_SYSCTL(sctp_max_retran_chunk)) &&
9598                     (chk->snd_count >= SCTP_BASE_SYSCTL(sctp_max_retran_chunk))) {
9599                         struct mbuf *op_err;
9600                         char msg[SCTP_DIAG_INFO_LEN];
9601
9602                         SCTP_SNPRINTF(msg, sizeof(msg), "TSN %8.8x retransmitted %d times, giving up",
9603                             chk->rec.data.tsn, chk->snd_count);
9604                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
9605                             msg);
9606                         atomic_add_int(&stcb->asoc.refcnt, 1);
9607                         sctp_abort_an_association(stcb->sctp_ep, stcb, op_err,
9608                             false, so_locked);
9609                         SCTP_TCB_LOCK(stcb);
9610                         atomic_subtract_int(&stcb->asoc.refcnt, 1);
9611                         return (SCTP_RETRAN_EXIT);
9612                 }
9613                 /* pick up the net */
9614                 net = chk->whoTo;
9615                 switch (net->ro._l_addr.sa.sa_family) {
9616 #ifdef INET
9617                 case AF_INET:
9618                         mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
9619                         break;
9620 #endif
9621 #ifdef INET6
9622                 case AF_INET6:
9623                         mtu = net->mtu - SCTP_MIN_OVERHEAD;
9624                         break;
9625 #endif
9626                 default:
9627                         /* TSNH */
9628                         mtu = net->mtu;
9629                         break;
9630                 }
9631
9632                 if ((asoc->peers_rwnd < mtu) && (asoc->total_flight > 0)) {
9633                         /* No room in peers rwnd */
9634                         uint32_t tsn;
9635
9636                         tsn = asoc->last_acked_seq + 1;
9637                         if (tsn == chk->rec.data.tsn) {
9638                                 /*
9639                                  * we make a special exception for this
9640                                  * case. The peer has no rwnd but is missing
9641                                  * the lowest chunk.. which is probably what
9642                                  * is holding up the rwnd.
9643                                  */
9644                                 goto one_chunk_around;
9645                         }
9646                         return (1);
9647                 }
9648 one_chunk_around:
9649                 if (asoc->peers_rwnd < mtu) {
9650                         one_chunk = 1;
9651                         if ((asoc->peers_rwnd == 0) &&
9652                             (asoc->total_flight == 0)) {
9653                                 chk->window_probe = 1;
9654                                 chk->whoTo->window_probe = 1;
9655                         }
9656                 }
9657 #ifdef SCTP_AUDITING_ENABLED
9658                 sctp_audit_log(0xC3, 2);
9659 #endif
9660                 bundle_at = 0;
9661                 m = NULL;
9662                 net->fast_retran_ip = 0;
9663                 if (chk->rec.data.doing_fast_retransmit == 0) {
9664                         /*
9665                          * if no FR in progress skip destination that have
9666                          * flight_size > cwnd.
9667                          */
9668                         if (net->flight_size >= net->cwnd) {
9669                                 continue;
9670                         }
9671                 } else {
9672                         /*
9673                          * Mark the destination net to have FR recovery
9674                          * limits put on it.
9675                          */
9676                         *fr_done = 1;
9677                         net->fast_retran_ip = 1;
9678                 }
9679
9680                 /*
9681                  * if no AUTH is yet included and this chunk requires it,
9682                  * make sure to account for it.  We don't apply the size
9683                  * until the AUTH chunk is actually added below in case
9684                  * there is no room for this chunk.
9685                  */
9686                 if (data_auth_reqd && (auth == NULL)) {
9687                         dmtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
9688                 } else
9689                         dmtu = 0;
9690
9691                 if ((chk->send_size <= (mtu - dmtu)) ||
9692                     (chk->flags & CHUNK_FLAGS_FRAGMENT_OK)) {
9693                         /* ok we will add this one */
9694                         if (data_auth_reqd) {
9695                                 if (auth == NULL) {
9696                                         m = sctp_add_auth_chunk(m,
9697                                             &endofchain,
9698                                             &auth,
9699                                             &auth_offset,
9700                                             stcb,
9701                                             SCTP_DATA);
9702                                         auth_keyid = chk->auth_keyid;
9703                                         override_ok = 0;
9704                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
9705                                 } else if (override_ok) {
9706                                         auth_keyid = chk->auth_keyid;
9707                                         override_ok = 0;
9708                                 } else if (chk->auth_keyid != auth_keyid) {
9709                                         /* different keyid, so done bundling */
9710                                         break;
9711                                 }
9712                         }
9713                         m = sctp_copy_mbufchain(chk->data, m, &endofchain, 0, chk->send_size, chk->copy_by_ref);
9714                         if (m == NULL) {
9715                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
9716                                 return (ENOMEM);
9717                         }
9718                         /* Do clear IP_DF ? */
9719                         if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
9720                                 no_fragmentflg = 0;
9721                         }
9722                         /* update our MTU size */
9723                         if (mtu > (chk->send_size + dmtu))
9724                                 mtu -= (chk->send_size + dmtu);
9725                         else
9726                                 mtu = 0;
9727                         data_list[bundle_at++] = chk;
9728                         if (one_chunk && (asoc->total_flight <= 0)) {
9729                                 SCTP_STAT_INCR(sctps_windowprobed);
9730                         }
9731                 }
9732                 if (one_chunk == 0) {
9733                         /*
9734                          * now are there anymore forward from chk to pick
9735                          * up?
9736                          */
9737                         for (fwd = TAILQ_NEXT(chk, sctp_next); fwd != NULL; fwd = TAILQ_NEXT(fwd, sctp_next)) {
9738                                 if (fwd->sent != SCTP_DATAGRAM_RESEND) {
9739                                         /* Nope, not for retran */
9740                                         continue;
9741                                 }
9742                                 if (fwd->whoTo != net) {
9743                                         /* Nope, not the net in question */
9744                                         continue;
9745                                 }
9746                                 if (data_auth_reqd && (auth == NULL)) {
9747                                         dmtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
9748                                 } else
9749                                         dmtu = 0;
9750                                 if (fwd->send_size <= (mtu - dmtu)) {
9751                                         if (data_auth_reqd) {
9752                                                 if (auth == NULL) {
9753                                                         m = sctp_add_auth_chunk(m,
9754                                                             &endofchain,
9755                                                             &auth,
9756                                                             &auth_offset,
9757                                                             stcb,
9758                                                             SCTP_DATA);
9759                                                         auth_keyid = fwd->auth_keyid;
9760                                                         override_ok = 0;
9761                                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
9762                                                 } else if (override_ok) {
9763                                                         auth_keyid = fwd->auth_keyid;
9764                                                         override_ok = 0;
9765                                                 } else if (fwd->auth_keyid != auth_keyid) {
9766                                                         /*
9767                                                          * different keyid,
9768                                                          * so done bundling
9769                                                          */
9770                                                         break;
9771                                                 }
9772                                         }
9773                                         m = sctp_copy_mbufchain(fwd->data, m, &endofchain, 0, fwd->send_size, fwd->copy_by_ref);
9774                                         if (m == NULL) {
9775                                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
9776                                                 return (ENOMEM);
9777                                         }
9778                                         /* Do clear IP_DF ? */
9779                                         if (fwd->flags & CHUNK_FLAGS_FRAGMENT_OK) {
9780                                                 no_fragmentflg = 0;
9781                                         }
9782                                         /* update our MTU size */
9783                                         if (mtu > (fwd->send_size + dmtu))
9784                                                 mtu -= (fwd->send_size + dmtu);
9785                                         else
9786                                                 mtu = 0;
9787                                         data_list[bundle_at++] = fwd;
9788                                         if (bundle_at >= SCTP_MAX_DATA_BUNDLING) {
9789                                                 break;
9790                                         }
9791                                 } else {
9792                                         /* can't fit so we are done */
9793                                         break;
9794                                 }
9795                         }
9796                 }
9797                 /* Is there something to send for this destination? */
9798                 if (m) {
9799                         /*
9800                          * No matter if we fail/or succeed we should start a
9801                          * timer. A failure is like a lost IP packet :-)
9802                          */
9803                         if (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
9804                                 /*
9805                                  * no timer running on this destination
9806                                  * restart it.
9807                                  */
9808                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
9809                                 tmr_started = 1;
9810                         }
9811                         switch (asoc->snd_edmid) {
9812                         case SCTP_EDMID_LOWER_LAYER_DTLS:
9813                                 use_zero_crc = true;
9814                                 break;
9815                         default:
9816                                 use_zero_crc = false;
9817                                 break;
9818                         }
9819                         /* Now lets send it, if there is anything to send :> */
9820                         if ((error = sctp_lowlevel_chunk_output(inp, stcb, net,
9821                             (struct sockaddr *)&net->ro._l_addr, m,
9822                             auth_offset, auth, auth_keyid,
9823                             no_fragmentflg, 0, 0,
9824                             inp->sctp_lport, stcb->rport, htonl(stcb->asoc.peer_vtag),
9825                             net->port, NULL,
9826                             0, 0,
9827                             use_zero_crc,
9828                             so_locked))) {
9829                                 /* error, we could not output */
9830                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
9831                                 if (error == ENOBUFS) {
9832                                         asoc->ifp_had_enobuf = 1;
9833                                         SCTP_STAT_INCR(sctps_lowlevelerr);
9834                                 }
9835                                 return (error);
9836                         } else {
9837                                 asoc->ifp_had_enobuf = 0;
9838                         }
9839                         endofchain = NULL;
9840                         auth = NULL;
9841                         auth_offset = 0;
9842                         /* For HB's */
9843                         /*
9844                          * We don't want to mark the net->sent time here
9845                          * since this we use this for HB and retrans cannot
9846                          * measure RTT
9847                          */
9848                         /* (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time); */
9849
9850                         /* For auto-close */
9851                         if (*now_filled == 0) {
9852                                 (void)SCTP_GETTIME_TIMEVAL(&asoc->time_last_sent);
9853                                 *now = asoc->time_last_sent;
9854                                 *now_filled = 1;
9855                         } else {
9856                                 asoc->time_last_sent = *now;
9857                         }
9858                         *cnt_out += bundle_at;
9859 #ifdef SCTP_AUDITING_ENABLED
9860                         sctp_audit_log(0xC4, bundle_at);
9861 #endif
9862                         if (bundle_at) {
9863                                 tsns_sent = data_list[0]->rec.data.tsn;
9864                         }
9865                         for (i = 0; i < bundle_at; i++) {
9866                                 SCTP_STAT_INCR(sctps_sendretransdata);
9867                                 data_list[i]->sent = SCTP_DATAGRAM_SENT;
9868                                 /*
9869                                  * When we have a revoked data, and we
9870                                  * retransmit it, then we clear the revoked
9871                                  * flag since this flag dictates if we
9872                                  * subtracted from the fs
9873                                  */
9874                                 if (data_list[i]->rec.data.chunk_was_revoked) {
9875                                         /* Deflate the cwnd */
9876                                         data_list[i]->whoTo->cwnd -= data_list[i]->book_size;
9877                                         data_list[i]->rec.data.chunk_was_revoked = 0;
9878                                 }
9879                                 data_list[i]->snd_count++;
9880                                 sctp_ucount_decr(asoc->sent_queue_retran_cnt);
9881                                 /* record the time */
9882                                 data_list[i]->sent_rcv_time = asoc->time_last_sent;
9883                                 if (data_list[i]->book_size_scale) {
9884                                         /*
9885                                          * need to double the book size on
9886                                          * this one
9887                                          */
9888                                         data_list[i]->book_size_scale = 0;
9889                                         /*
9890                                          * Since we double the booksize, we
9891                                          * must also double the output queue
9892                                          * size, since this get shrunk when
9893                                          * we free by this amount.
9894                                          */
9895                                         atomic_add_int(&((asoc)->total_output_queue_size), data_list[i]->book_size);
9896                                         data_list[i]->book_size *= 2;
9897                                 } else {
9898                                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_RWND_ENABLE) {
9899                                                 sctp_log_rwnd(SCTP_DECREASE_PEER_RWND,
9900                                                     asoc->peers_rwnd, data_list[i]->send_size, SCTP_BASE_SYSCTL(sctp_peer_chunk_oh));
9901                                         }
9902                                         asoc->peers_rwnd = sctp_sbspace_sub(asoc->peers_rwnd,
9903                                             (uint32_t)(data_list[i]->send_size +
9904                                             SCTP_BASE_SYSCTL(sctp_peer_chunk_oh)));
9905                                 }
9906                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
9907                                         sctp_misc_ints(SCTP_FLIGHT_LOG_UP_RSND,
9908                                             data_list[i]->whoTo->flight_size,
9909                                             data_list[i]->book_size,
9910                                             (uint32_t)(uintptr_t)data_list[i]->whoTo,
9911                                             data_list[i]->rec.data.tsn);
9912                                 }
9913                                 sctp_flight_size_increase(data_list[i]);
9914                                 sctp_total_flight_increase(stcb, data_list[i]);
9915                                 if (asoc->peers_rwnd < stcb->sctp_ep->sctp_ep.sctp_sws_sender) {
9916                                         /* SWS sender side engages */
9917                                         asoc->peers_rwnd = 0;
9918                                 }
9919                                 if ((i == 0) &&
9920                                     (data_list[i]->rec.data.doing_fast_retransmit)) {
9921                                         SCTP_STAT_INCR(sctps_sendfastretrans);
9922                                         if ((data_list[i] == TAILQ_FIRST(&asoc->sent_queue)) &&
9923                                             (tmr_started == 0)) {
9924                                                 /*-
9925                                                  * ok we just fast-retrans'd
9926                                                  * the lowest TSN, i.e the
9927                                                  * first on the list. In
9928                                                  * this case we want to give
9929                                                  * some more time to get a
9930                                                  * SACK back without a
9931                                                  * t3-expiring.
9932                                                  */
9933                                                 sctp_timer_stop(SCTP_TIMER_TYPE_SEND, inp, stcb, net,
9934                                                     SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_2);
9935                                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
9936                                         }
9937                                 }
9938                         }
9939                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
9940                                 sctp_log_cwnd(stcb, net, tsns_sent, SCTP_CWND_LOG_FROM_RESEND);
9941                         }
9942 #ifdef SCTP_AUDITING_ENABLED
9943                         sctp_auditing(21, inp, stcb, NULL);
9944 #endif
9945                 } else {
9946                         /* None will fit */
9947                         return (1);
9948                 }
9949                 if (asoc->sent_queue_retran_cnt <= 0) {
9950                         /* all done we have no more to retran */
9951                         asoc->sent_queue_retran_cnt = 0;
9952                         break;
9953                 }
9954                 if (one_chunk) {
9955                         /* No more room in rwnd */
9956                         return (1);
9957                 }
9958                 /* stop the for loop here. we sent out a packet */
9959                 break;
9960         }
9961         return (0);
9962 }
9963
9964 static void
9965 sctp_timer_validation(struct sctp_inpcb *inp,
9966     struct sctp_tcb *stcb,
9967     struct sctp_association *asoc)
9968 {
9969         struct sctp_nets *net;
9970
9971         /* Validate that a timer is running somewhere */
9972         TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
9973                 if (SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
9974                         /* Here is a timer */
9975                         return;
9976                 }
9977         }
9978         SCTP_TCB_LOCK_ASSERT(stcb);
9979         /* Gak, we did not have a timer somewhere */
9980         SCTPDBG(SCTP_DEBUG_OUTPUT3, "Deadlock avoided starting timer on a dest at retran\n");
9981         if (asoc->alternate) {
9982                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, asoc->alternate);
9983         } else {
9984                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, asoc->primary_destination);
9985         }
9986         return;
9987 }
9988
9989 void
9990 sctp_chunk_output(struct sctp_inpcb *inp,
9991     struct sctp_tcb *stcb,
9992     int from_where,
9993     int so_locked)
9994 {
9995         /*-
9996          * Ok this is the generic chunk service queue. we must do the
9997          * following:
9998          * - See if there are retransmits pending, if so we must
9999          *   do these first.
10000          * - Service the stream queue that is next, moving any
10001          *   message (note I must get a complete message i.e.
10002          *   FIRST/MIDDLE and LAST to the out queue in one pass) and assigning
10003          *   TSN's
10004          * - Check to see if the cwnd/rwnd allows any output, if so we
10005          *   go ahead and formulate and send the low level chunks. Making sure
10006          *   to combine any control in the control chunk queue also.
10007          */
10008         struct sctp_association *asoc;
10009         struct sctp_nets *net;
10010         int error = 0, num_out, tot_out = 0, ret = 0, reason_code;
10011         unsigned int burst_cnt = 0;
10012         struct timeval now;
10013         int now_filled = 0;
10014         int nagle_on;
10015         uint32_t frag_point = sctp_get_frag_point(stcb);
10016         int un_sent = 0;
10017         int fr_done;
10018         unsigned int tot_frs = 0;
10019
10020         asoc = &stcb->asoc;
10021 do_it_again:
10022         /* The Nagle algorithm is only applied when handling a send call. */
10023         if (from_where == SCTP_OUTPUT_FROM_USR_SEND) {
10024                 if (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_NODELAY)) {
10025                         nagle_on = 0;
10026                 } else {
10027                         nagle_on = 1;
10028                 }
10029         } else {
10030                 nagle_on = 0;
10031         }
10032         SCTP_TCB_LOCK_ASSERT(stcb);
10033
10034         un_sent = (stcb->asoc.total_output_queue_size - stcb->asoc.total_flight);
10035
10036         if ((un_sent <= 0) &&
10037             (TAILQ_EMPTY(&asoc->control_send_queue)) &&
10038             (TAILQ_EMPTY(&asoc->asconf_send_queue)) &&
10039             (asoc->sent_queue_retran_cnt == 0) &&
10040             (asoc->trigger_reset == 0)) {
10041                 /* Nothing to do unless there is something to be sent left */
10042                 return;
10043         }
10044         /*
10045          * Do we have something to send, data or control AND a sack timer
10046          * running, if so piggy-back the sack.
10047          */
10048         if (SCTP_OS_TIMER_PENDING(&stcb->asoc.dack_timer.timer)) {
10049                 sctp_send_sack(stcb, so_locked);
10050                 sctp_timer_stop(SCTP_TIMER_TYPE_RECV, stcb->sctp_ep, stcb, NULL,
10051                     SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_3);
10052         }
10053         while (asoc->sent_queue_retran_cnt) {
10054                 /*-
10055                  * Ok, it is retransmission time only, we send out only ONE
10056                  * packet with a single call off to the retran code.
10057                  */
10058                 if (from_where == SCTP_OUTPUT_FROM_COOKIE_ACK) {
10059                         /*-
10060                          * Special hook for handling cookies discarded
10061                          * by peer that carried data. Send cookie-ack only
10062                          * and then the next call with get the retran's.
10063                          */
10064                         (void)sctp_med_chunk_output(inp, stcb, asoc, &num_out, &reason_code, 1,
10065                             from_where,
10066                             &now, &now_filled, frag_point, so_locked);
10067                         return;
10068                 } else if (from_where != SCTP_OUTPUT_FROM_HB_TMR) {
10069                         /* if its not from a HB then do it */
10070                         fr_done = 0;
10071                         ret = sctp_chunk_retransmission(inp, stcb, asoc, &num_out, &now, &now_filled, &fr_done, so_locked);
10072                         if (fr_done) {
10073                                 tot_frs++;
10074                         }
10075                 } else {
10076                         /*
10077                          * its from any other place, we don't allow retran
10078                          * output (only control)
10079                          */
10080                         ret = 1;
10081                 }
10082                 if (ret > 0) {
10083                         /* Can't send anymore */
10084                         /*-
10085                          * now lets push out control by calling med-level
10086                          * output once. this assures that we WILL send HB's
10087                          * if queued too.
10088                          */
10089                         (void)sctp_med_chunk_output(inp, stcb, asoc, &num_out, &reason_code, 1,
10090                             from_where,
10091                             &now, &now_filled, frag_point, so_locked);
10092 #ifdef SCTP_AUDITING_ENABLED
10093                         sctp_auditing(8, inp, stcb, NULL);
10094 #endif
10095                         sctp_timer_validation(inp, stcb, asoc);
10096                         return;
10097                 }
10098                 if (ret < 0) {
10099                         /*-
10100                          * The count was off.. retran is not happening so do
10101                          * the normal retransmission.
10102                          */
10103 #ifdef SCTP_AUDITING_ENABLED
10104                         sctp_auditing(9, inp, stcb, NULL);
10105 #endif
10106                         if (ret == SCTP_RETRAN_EXIT) {
10107                                 return;
10108                         }
10109                         break;
10110                 }
10111                 if (from_where == SCTP_OUTPUT_FROM_T3) {
10112                         /* Only one transmission allowed out of a timeout */
10113 #ifdef SCTP_AUDITING_ENABLED
10114                         sctp_auditing(10, inp, stcb, NULL);
10115 #endif
10116                         /* Push out any control */
10117                         (void)sctp_med_chunk_output(inp, stcb, asoc, &num_out, &reason_code, 1, from_where,
10118                             &now, &now_filled, frag_point, so_locked);
10119                         return;
10120                 }
10121                 if ((asoc->fr_max_burst > 0) && (tot_frs >= asoc->fr_max_burst)) {
10122                         /* Hit FR burst limit */
10123                         return;
10124                 }
10125                 if ((num_out == 0) && (ret == 0)) {
10126                         /* No more retrans to send */
10127                         break;
10128                 }
10129         }
10130 #ifdef SCTP_AUDITING_ENABLED
10131         sctp_auditing(12, inp, stcb, NULL);
10132 #endif
10133         /* Check for bad destinations, if they exist move chunks around. */
10134         TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
10135                 if ((net->dest_state & SCTP_ADDR_REACHABLE) == 0) {
10136                         /*-
10137                          * if possible move things off of this address we
10138                          * still may send below due to the dormant state but
10139                          * we try to find an alternate address to send to
10140                          * and if we have one we move all queued data on the
10141                          * out wheel to this alternate address.
10142                          */
10143                         if (net->ref_count > 1)
10144                                 sctp_move_chunks_from_net(stcb, net);
10145                 } else {
10146                         /*-
10147                          * if ((asoc->sat_network) || (net->addr_is_local))
10148                          * { burst_limit = asoc->max_burst *
10149                          * SCTP_SAT_NETWORK_BURST_INCR; }
10150                          */
10151                         if (asoc->max_burst > 0) {
10152                                 if (SCTP_BASE_SYSCTL(sctp_use_cwnd_based_maxburst)) {
10153                                         if ((net->flight_size + (asoc->max_burst * net->mtu)) < net->cwnd) {
10154                                                 /*
10155                                                  * JRS - Use the congestion
10156                                                  * control given in the
10157                                                  * congestion control module
10158                                                  */
10159                                                 asoc->cc_functions.sctp_cwnd_update_after_output(stcb, net, asoc->max_burst);
10160                                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_MAXBURST_ENABLE) {
10161                                                         sctp_log_maxburst(stcb, net, 0, asoc->max_burst, SCTP_MAX_BURST_APPLIED);
10162                                                 }
10163                                                 SCTP_STAT_INCR(sctps_maxburstqueued);
10164                                         }
10165                                         net->fast_retran_ip = 0;
10166                                 } else {
10167                                         if (net->flight_size == 0) {
10168                                                 /*
10169                                                  * Should be decaying the
10170                                                  * cwnd here
10171                                                  */
10172                                                 ;
10173                                         }
10174                                 }
10175                         }
10176                 }
10177         }
10178         burst_cnt = 0;
10179         do {
10180                 error = sctp_med_chunk_output(inp, stcb, asoc, &num_out,
10181                     &reason_code, 0, from_where,
10182                     &now, &now_filled, frag_point, so_locked);
10183                 if (error) {
10184                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Error %d was returned from med-c-op\n", error);
10185                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_MAXBURST_ENABLE) {
10186                                 sctp_log_maxburst(stcb, asoc->primary_destination, error, burst_cnt, SCTP_MAX_BURST_ERROR_STOP);
10187                         }
10188                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
10189                                 sctp_log_cwnd(stcb, NULL, error, SCTP_SEND_NOW_COMPLETES);
10190                                 sctp_log_cwnd(stcb, NULL, 0xdeadbeef, SCTP_SEND_NOW_COMPLETES);
10191                         }
10192                         break;
10193                 }
10194                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "m-c-o put out %d\n", num_out);
10195
10196                 tot_out += num_out;
10197                 burst_cnt++;
10198                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
10199                         sctp_log_cwnd(stcb, NULL, num_out, SCTP_SEND_NOW_COMPLETES);
10200                         if (num_out == 0) {
10201                                 sctp_log_cwnd(stcb, NULL, reason_code, SCTP_SEND_NOW_COMPLETES);
10202                         }
10203                 }
10204                 if (nagle_on) {
10205                         /*
10206                          * When the Nagle algorithm is used, look at how
10207                          * much is unsent, then if its smaller than an MTU
10208                          * and we have data in flight we stop, except if we
10209                          * are handling a fragmented user message.
10210                          */
10211                         un_sent = stcb->asoc.total_output_queue_size - stcb->asoc.total_flight;
10212                         if ((un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD)) &&
10213                             (stcb->asoc.total_flight > 0)) {
10214 /*      &&                   sctp_is_feature_on(inp, SCTP_PCB_FLAGS_EXPLICIT_EOR))) {*/
10215                                 break;
10216                         }
10217                 }
10218                 if (TAILQ_EMPTY(&asoc->control_send_queue) &&
10219                     TAILQ_EMPTY(&asoc->send_queue) &&
10220                     sctp_is_there_unsent_data(stcb, so_locked) == 0) {
10221                         /* Nothing left to send */
10222                         break;
10223                 }
10224                 if ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) <= 0) {
10225                         /* Nothing left to send */
10226                         break;
10227                 }
10228         } while (num_out &&
10229             ((asoc->max_burst == 0) ||
10230             SCTP_BASE_SYSCTL(sctp_use_cwnd_based_maxburst) ||
10231             (burst_cnt < asoc->max_burst)));
10232
10233         if (SCTP_BASE_SYSCTL(sctp_use_cwnd_based_maxburst) == 0) {
10234                 if ((asoc->max_burst > 0) && (burst_cnt >= asoc->max_burst)) {
10235                         SCTP_STAT_INCR(sctps_maxburstqueued);
10236                         asoc->burst_limit_applied = 1;
10237                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_MAXBURST_ENABLE) {
10238                                 sctp_log_maxburst(stcb, asoc->primary_destination, 0, burst_cnt, SCTP_MAX_BURST_APPLIED);
10239                         }
10240                 } else {
10241                         asoc->burst_limit_applied = 0;
10242                 }
10243         }
10244         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
10245                 sctp_log_cwnd(stcb, NULL, tot_out, SCTP_SEND_NOW_COMPLETES);
10246         }
10247         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Ok, we have put out %d chunks\n",
10248             tot_out);
10249
10250         /*-
10251          * Now we need to clean up the control chunk chain if a ECNE is on
10252          * it. It must be marked as UNSENT again so next call will continue
10253          * to send it until such time that we get a CWR, to remove it.
10254          */
10255         if (stcb->asoc.ecn_echo_cnt_onq)
10256                 sctp_fix_ecn_echo(asoc);
10257
10258         if (stcb->asoc.trigger_reset) {
10259                 if (sctp_send_stream_reset_out_if_possible(stcb, so_locked) == 0) {
10260                         goto do_it_again;
10261                 }
10262         }
10263         return;
10264 }
10265
10266 int
10267 sctp_output(
10268     struct sctp_inpcb *inp,
10269     struct mbuf *m,
10270     struct sockaddr *addr,
10271     struct mbuf *control,
10272     struct thread *p,
10273     int flags)
10274 {
10275         if (inp == NULL) {
10276                 SCTP_LTRACE_ERR_RET_PKT(m, inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
10277                 return (EINVAL);
10278         }
10279
10280         if (inp->sctp_socket == NULL) {
10281                 SCTP_LTRACE_ERR_RET_PKT(m, inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
10282                 return (EINVAL);
10283         }
10284         return (sctp_sosend(inp->sctp_socket,
10285             addr,
10286             (struct uio *)NULL,
10287             m,
10288             control,
10289             flags, p
10290             ));
10291 }
10292
10293 void
10294 send_forward_tsn(struct sctp_tcb *stcb,
10295     struct sctp_association *asoc)
10296 {
10297         struct sctp_tmit_chunk *chk, *at, *tp1, *last;
10298         struct sctp_forward_tsn_chunk *fwdtsn;
10299         struct sctp_strseq *strseq;
10300         struct sctp_strseq_mid *strseq_m;
10301         uint32_t advance_peer_ack_point;
10302         unsigned int cnt_of_space, i, ovh;
10303         unsigned int space_needed;
10304         unsigned int cnt_of_skipped = 0;
10305
10306         SCTP_TCB_LOCK_ASSERT(stcb);
10307         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
10308                 if (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN) {
10309                         /* mark it to unsent */
10310                         chk->sent = SCTP_DATAGRAM_UNSENT;
10311                         chk->snd_count = 0;
10312                         /* Do we correct its output location? */
10313                         if (chk->whoTo) {
10314                                 sctp_free_remote_addr(chk->whoTo);
10315                                 chk->whoTo = NULL;
10316                         }
10317                         goto sctp_fill_in_rest;
10318                 }
10319         }
10320         /* Ok if we reach here we must build one */
10321         sctp_alloc_a_chunk(stcb, chk);
10322         if (chk == NULL) {
10323                 return;
10324         }
10325         asoc->fwd_tsn_cnt++;
10326         chk->copy_by_ref = 0;
10327         /*
10328          * We don't do the old thing here since this is used not for on-wire
10329          * but to tell if we are sending a fwd-tsn by the stack during
10330          * output. And if its a IFORWARD or a FORWARD it is a fwd-tsn.
10331          */
10332         chk->rec.chunk_id.id = SCTP_FORWARD_CUM_TSN;
10333         chk->rec.chunk_id.can_take_data = 0;
10334         chk->flags = 0;
10335         chk->asoc = asoc;
10336         chk->whoTo = NULL;
10337         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
10338         if (chk->data == NULL) {
10339                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
10340                 return;
10341         }
10342         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
10343         chk->sent = SCTP_DATAGRAM_UNSENT;
10344         chk->snd_count = 0;
10345         TAILQ_INSERT_TAIL(&asoc->control_send_queue, chk, sctp_next);
10346         asoc->ctrl_queue_cnt++;
10347 sctp_fill_in_rest:
10348         /*-
10349          * Here we go through and fill out the part that deals with
10350          * stream/seq of the ones we skip.
10351          */
10352         SCTP_BUF_LEN(chk->data) = 0;
10353         TAILQ_FOREACH(at, &asoc->sent_queue, sctp_next) {
10354                 if ((at->sent != SCTP_FORWARD_TSN_SKIP) &&
10355                     (at->sent != SCTP_DATAGRAM_NR_ACKED)) {
10356                         /* no more to look at */
10357                         break;
10358                 }
10359                 if (!asoc->idata_supported && (at->rec.data.rcv_flags & SCTP_DATA_UNORDERED)) {
10360                         /* We don't report these */
10361                         continue;
10362                 }
10363                 cnt_of_skipped++;
10364         }
10365         if (asoc->idata_supported) {
10366                 space_needed = (sizeof(struct sctp_forward_tsn_chunk) +
10367                     (cnt_of_skipped * sizeof(struct sctp_strseq_mid)));
10368         } else {
10369                 space_needed = (sizeof(struct sctp_forward_tsn_chunk) +
10370                     (cnt_of_skipped * sizeof(struct sctp_strseq)));
10371         }
10372         cnt_of_space = (unsigned int)M_TRAILINGSPACE(chk->data);
10373
10374         if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
10375                 ovh = SCTP_MIN_OVERHEAD;
10376         } else {
10377                 ovh = SCTP_MIN_V4_OVERHEAD;
10378         }
10379         if (cnt_of_space > (asoc->smallest_mtu - ovh)) {
10380                 /* trim to a mtu size */
10381                 cnt_of_space = asoc->smallest_mtu - ovh;
10382         }
10383         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_TRY_ADVANCE) {
10384                 sctp_misc_ints(SCTP_FWD_TSN_CHECK,
10385                     0xff, 0, cnt_of_skipped,
10386                     asoc->advanced_peer_ack_point);
10387         }
10388         advance_peer_ack_point = asoc->advanced_peer_ack_point;
10389         if (cnt_of_space < space_needed) {
10390                 /*-
10391                  * ok we must trim down the chunk by lowering the
10392                  * advance peer ack point.
10393                  */
10394                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_TRY_ADVANCE) {
10395                         sctp_misc_ints(SCTP_FWD_TSN_CHECK,
10396                             0xff, 0xff, cnt_of_space,
10397                             space_needed);
10398                 }
10399                 cnt_of_skipped = cnt_of_space - sizeof(struct sctp_forward_tsn_chunk);
10400                 if (asoc->idata_supported) {
10401                         cnt_of_skipped /= sizeof(struct sctp_strseq_mid);
10402                 } else {
10403                         cnt_of_skipped /= sizeof(struct sctp_strseq);
10404                 }
10405                 /*-
10406                  * Go through and find the TSN that will be the one
10407                  * we report.
10408                  */
10409                 at = TAILQ_FIRST(&asoc->sent_queue);
10410                 if (at != NULL) {
10411                         for (i = 0; i < cnt_of_skipped; i++) {
10412                                 tp1 = TAILQ_NEXT(at, sctp_next);
10413                                 if (tp1 == NULL) {
10414                                         break;
10415                                 }
10416                                 at = tp1;
10417                         }
10418                 }
10419                 if (at && SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_TRY_ADVANCE) {
10420                         sctp_misc_ints(SCTP_FWD_TSN_CHECK,
10421                             0xff, cnt_of_skipped, at->rec.data.tsn,
10422                             asoc->advanced_peer_ack_point);
10423                 }
10424                 last = at;
10425                 /*-
10426                  * last now points to last one I can report, update
10427                  * peer ack point
10428                  */
10429                 if (last) {
10430                         advance_peer_ack_point = last->rec.data.tsn;
10431                 }
10432                 if (asoc->idata_supported) {
10433                         space_needed = sizeof(struct sctp_forward_tsn_chunk) +
10434                             cnt_of_skipped * sizeof(struct sctp_strseq_mid);
10435                 } else {
10436                         space_needed = sizeof(struct sctp_forward_tsn_chunk) +
10437                             cnt_of_skipped * sizeof(struct sctp_strseq);
10438                 }
10439         }
10440         chk->send_size = space_needed;
10441         /* Setup the chunk */
10442         fwdtsn = mtod(chk->data, struct sctp_forward_tsn_chunk *);
10443         fwdtsn->ch.chunk_length = htons(chk->send_size);
10444         fwdtsn->ch.chunk_flags = 0;
10445         if (asoc->idata_supported) {
10446                 fwdtsn->ch.chunk_type = SCTP_IFORWARD_CUM_TSN;
10447         } else {
10448                 fwdtsn->ch.chunk_type = SCTP_FORWARD_CUM_TSN;
10449         }
10450         fwdtsn->new_cumulative_tsn = htonl(advance_peer_ack_point);
10451         SCTP_BUF_LEN(chk->data) = chk->send_size;
10452         fwdtsn++;
10453         /*-
10454          * Move pointer to after the fwdtsn and transfer to the
10455          * strseq pointer.
10456          */
10457         if (asoc->idata_supported) {
10458                 strseq_m = (struct sctp_strseq_mid *)fwdtsn;
10459                 strseq = NULL;
10460         } else {
10461                 strseq = (struct sctp_strseq *)fwdtsn;
10462                 strseq_m = NULL;
10463         }
10464         /*-
10465          * Now populate the strseq list. This is done blindly
10466          * without pulling out duplicate stream info. This is
10467          * inefficient but won't harm the process since the peer will
10468          * look at these in sequence and will thus release anything.
10469          * It could mean we exceed the PMTU and chop off some that
10470          * we could have included.. but this is unlikely (aka 1432/4
10471          * would mean 300+ stream seq's would have to be reported in
10472          * one FWD-TSN. With a bit of work we can later FIX this to
10473          * optimize and pull out duplicates.. but it does add more
10474          * overhead. So for now... not!
10475          */
10476         i = 0;
10477         TAILQ_FOREACH(at, &asoc->sent_queue, sctp_next) {
10478                 if (i >= cnt_of_skipped) {
10479                         break;
10480                 }
10481                 if (!asoc->idata_supported && (at->rec.data.rcv_flags & SCTP_DATA_UNORDERED)) {
10482                         /* We don't report these */
10483                         continue;
10484                 }
10485                 if (at->rec.data.tsn == advance_peer_ack_point) {
10486                         at->rec.data.fwd_tsn_cnt = 0;
10487                 }
10488                 if (asoc->idata_supported) {
10489                         strseq_m->sid = htons(at->rec.data.sid);
10490                         if (at->rec.data.rcv_flags & SCTP_DATA_UNORDERED) {
10491                                 strseq_m->flags = htons(PR_SCTP_UNORDERED_FLAG);
10492                         } else {
10493                                 strseq_m->flags = 0;
10494                         }
10495                         strseq_m->mid = htonl(at->rec.data.mid);
10496                         strseq_m++;
10497                 } else {
10498                         strseq->sid = htons(at->rec.data.sid);
10499                         strseq->ssn = htons((uint16_t)at->rec.data.mid);
10500                         strseq++;
10501                 }
10502                 i++;
10503         }
10504         return;
10505 }
10506
10507 void
10508 sctp_send_sack(struct sctp_tcb *stcb, int so_locked)
10509 {
10510         /*-
10511          * Queue up a SACK or NR-SACK in the control queue.
10512          * We must first check to see if a SACK or NR-SACK is
10513          * somehow on the control queue.
10514          * If so, we will take and and remove the old one.
10515          */
10516         struct sctp_association *asoc;
10517         struct sctp_tmit_chunk *chk, *a_chk;
10518         struct sctp_sack_chunk *sack;
10519         struct sctp_nr_sack_chunk *nr_sack;
10520         struct sctp_gap_ack_block *gap_descriptor;
10521         const struct sack_track *selector;
10522         int mergeable = 0;
10523         int offset;
10524         caddr_t limit;
10525         uint32_t *dup;
10526         int limit_reached = 0;
10527         unsigned int i, siz, j;
10528         unsigned int num_gap_blocks = 0, num_nr_gap_blocks = 0, space;
10529         int num_dups = 0;
10530         int space_req;
10531         uint32_t highest_tsn;
10532         uint8_t flags;
10533         uint8_t type;
10534         uint8_t tsn_map;
10535
10536         if (stcb->asoc.nrsack_supported == 1) {
10537                 type = SCTP_NR_SELECTIVE_ACK;
10538         } else {
10539                 type = SCTP_SELECTIVE_ACK;
10540         }
10541         a_chk = NULL;
10542         asoc = &stcb->asoc;
10543         SCTP_TCB_LOCK_ASSERT(stcb);
10544         if (asoc->last_data_chunk_from == NULL) {
10545                 /* Hmm we never received anything */
10546                 return;
10547         }
10548         sctp_slide_mapping_arrays(stcb);
10549         sctp_set_rwnd(stcb, asoc);
10550         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
10551                 if (chk->rec.chunk_id.id == type) {
10552                         /* Hmm, found a sack already on queue, remove it */
10553                         TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
10554                         asoc->ctrl_queue_cnt--;
10555                         a_chk = chk;
10556                         if (a_chk->data) {
10557                                 sctp_m_freem(a_chk->data);
10558                                 a_chk->data = NULL;
10559                         }
10560                         if (a_chk->whoTo) {
10561                                 sctp_free_remote_addr(a_chk->whoTo);
10562                                 a_chk->whoTo = NULL;
10563                         }
10564                         break;
10565                 }
10566         }
10567         if (a_chk == NULL) {
10568                 sctp_alloc_a_chunk(stcb, a_chk);
10569                 if (a_chk == NULL) {
10570                         /* No memory so we drop the idea, and set a timer */
10571                         if (stcb->asoc.delayed_ack) {
10572                                 sctp_timer_stop(SCTP_TIMER_TYPE_RECV,
10573                                     stcb->sctp_ep, stcb, NULL,
10574                                     SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_4);
10575                                 sctp_timer_start(SCTP_TIMER_TYPE_RECV,
10576                                     stcb->sctp_ep, stcb, NULL);
10577                         } else {
10578                                 stcb->asoc.send_sack = 1;
10579                         }
10580                         return;
10581                 }
10582                 a_chk->copy_by_ref = 0;
10583                 a_chk->rec.chunk_id.id = type;
10584                 a_chk->rec.chunk_id.can_take_data = 1;
10585         }
10586         /* Clear our pkt counts */
10587         asoc->data_pkts_seen = 0;
10588
10589         a_chk->flags = 0;
10590         a_chk->asoc = asoc;
10591         a_chk->snd_count = 0;
10592         a_chk->send_size = 0;   /* fill in later */
10593         a_chk->sent = SCTP_DATAGRAM_UNSENT;
10594         a_chk->whoTo = NULL;
10595
10596         if ((asoc->last_data_chunk_from->dest_state & SCTP_ADDR_REACHABLE) == 0) {
10597                 /*-
10598                  * Ok, the destination for the SACK is unreachable, lets see if
10599                  * we can select an alternate to asoc->last_data_chunk_from
10600                  */
10601                 a_chk->whoTo = sctp_find_alternate_net(stcb, asoc->last_data_chunk_from, 0);
10602                 if (a_chk->whoTo == NULL) {
10603                         /* Nope, no alternate */
10604                         a_chk->whoTo = asoc->last_data_chunk_from;
10605                 }
10606         } else {
10607                 a_chk->whoTo = asoc->last_data_chunk_from;
10608         }
10609         if (a_chk->whoTo) {
10610                 atomic_add_int(&a_chk->whoTo->ref_count, 1);
10611         }
10612         if (SCTP_TSN_GT(asoc->highest_tsn_inside_map, asoc->highest_tsn_inside_nr_map)) {
10613                 highest_tsn = asoc->highest_tsn_inside_map;
10614         } else {
10615                 highest_tsn = asoc->highest_tsn_inside_nr_map;
10616         }
10617         if (highest_tsn == asoc->cumulative_tsn) {
10618                 /* no gaps */
10619                 if (type == SCTP_SELECTIVE_ACK) {
10620                         space_req = sizeof(struct sctp_sack_chunk);
10621                 } else {
10622                         space_req = sizeof(struct sctp_nr_sack_chunk);
10623                 }
10624         } else {
10625                 /* gaps get a cluster */
10626                 space_req = MCLBYTES;
10627         }
10628         /* Ok now lets formulate a MBUF with our sack */
10629         a_chk->data = sctp_get_mbuf_for_msg(space_req, 0, M_NOWAIT, 1, MT_DATA);
10630         if ((a_chk->data == NULL) ||
10631             (a_chk->whoTo == NULL)) {
10632                 /* rats, no mbuf memory */
10633                 if (a_chk->data) {
10634                         /* was a problem with the destination */
10635                         sctp_m_freem(a_chk->data);
10636                         a_chk->data = NULL;
10637                 }
10638                 sctp_free_a_chunk(stcb, a_chk, so_locked);
10639                 /* sa_ignore NO_NULL_CHK */
10640                 if (stcb->asoc.delayed_ack) {
10641                         sctp_timer_stop(SCTP_TIMER_TYPE_RECV,
10642                             stcb->sctp_ep, stcb, NULL,
10643                             SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_5);
10644                         sctp_timer_start(SCTP_TIMER_TYPE_RECV,
10645                             stcb->sctp_ep, stcb, NULL);
10646                 } else {
10647                         stcb->asoc.send_sack = 1;
10648                 }
10649                 return;
10650         }
10651         /* ok, lets go through and fill it in */
10652         SCTP_BUF_RESV_UF(a_chk->data, SCTP_MIN_OVERHEAD);
10653         space = (unsigned int)M_TRAILINGSPACE(a_chk->data);
10654         if (space > (a_chk->whoTo->mtu - SCTP_MIN_OVERHEAD)) {
10655                 space = (a_chk->whoTo->mtu - SCTP_MIN_OVERHEAD);
10656         }
10657         limit = mtod(a_chk->data, caddr_t);
10658         limit += space;
10659
10660         flags = 0;
10661
10662         if ((asoc->sctp_cmt_on_off > 0) &&
10663             SCTP_BASE_SYSCTL(sctp_cmt_use_dac)) {
10664                 /*-
10665                  * CMT DAC algorithm: If 2 (i.e., 0x10) packets have been
10666                  * received, then set high bit to 1, else 0. Reset
10667                  * pkts_rcvd.
10668                  */
10669                 flags |= (asoc->cmt_dac_pkts_rcvd << 6);
10670                 asoc->cmt_dac_pkts_rcvd = 0;
10671         }
10672 #ifdef SCTP_ASOCLOG_OF_TSNS
10673         stcb->asoc.cumack_logsnt[stcb->asoc.cumack_log_atsnt] = asoc->cumulative_tsn;
10674         stcb->asoc.cumack_log_atsnt++;
10675         if (stcb->asoc.cumack_log_atsnt >= SCTP_TSN_LOG_SIZE) {
10676                 stcb->asoc.cumack_log_atsnt = 0;
10677         }
10678 #endif
10679         /* reset the readers interpretation */
10680         stcb->freed_by_sorcv_sincelast = 0;
10681
10682         if (type == SCTP_SELECTIVE_ACK) {
10683                 sack = mtod(a_chk->data, struct sctp_sack_chunk *);
10684                 nr_sack = NULL;
10685                 gap_descriptor = (struct sctp_gap_ack_block *)((caddr_t)sack + sizeof(struct sctp_sack_chunk));
10686                 if (highest_tsn > asoc->mapping_array_base_tsn) {
10687                         siz = (((highest_tsn - asoc->mapping_array_base_tsn) + 1) + 7) / 8;
10688                 } else {
10689                         siz = (((MAX_TSN - asoc->mapping_array_base_tsn) + 1) + highest_tsn + 7) / 8;
10690                 }
10691         } else {
10692                 sack = NULL;
10693                 nr_sack = mtod(a_chk->data, struct sctp_nr_sack_chunk *);
10694                 gap_descriptor = (struct sctp_gap_ack_block *)((caddr_t)nr_sack + sizeof(struct sctp_nr_sack_chunk));
10695                 if (asoc->highest_tsn_inside_map > asoc->mapping_array_base_tsn) {
10696                         siz = (((asoc->highest_tsn_inside_map - asoc->mapping_array_base_tsn) + 1) + 7) / 8;
10697                 } else {
10698                         siz = (((MAX_TSN - asoc->mapping_array_base_tsn) + 1) + asoc->highest_tsn_inside_map + 7) / 8;
10699                 }
10700         }
10701
10702         if (SCTP_TSN_GT(asoc->mapping_array_base_tsn, asoc->cumulative_tsn)) {
10703                 offset = 1;
10704         } else {
10705                 offset = asoc->mapping_array_base_tsn - asoc->cumulative_tsn;
10706         }
10707         if (((type == SCTP_SELECTIVE_ACK) &&
10708             SCTP_TSN_GT(highest_tsn, asoc->cumulative_tsn)) ||
10709             ((type == SCTP_NR_SELECTIVE_ACK) &&
10710             SCTP_TSN_GT(asoc->highest_tsn_inside_map, asoc->cumulative_tsn))) {
10711                 /* we have a gap .. maybe */
10712                 for (i = 0; i < siz; i++) {
10713                         tsn_map = asoc->mapping_array[i];
10714                         if (type == SCTP_SELECTIVE_ACK) {
10715                                 tsn_map |= asoc->nr_mapping_array[i];
10716                         }
10717                         if (i == 0) {
10718                                 /*
10719                                  * Clear all bits corresponding to TSNs
10720                                  * smaller or equal to the cumulative TSN.
10721                                  */
10722                                 tsn_map &= (~0U << (1 - offset));
10723                         }
10724                         selector = &sack_array[tsn_map];
10725                         if (mergeable && selector->right_edge) {
10726                                 /*
10727                                  * Backup, left and right edges were ok to
10728                                  * merge.
10729                                  */
10730                                 num_gap_blocks--;
10731                                 gap_descriptor--;
10732                         }
10733                         if (selector->num_entries == 0)
10734                                 mergeable = 0;
10735                         else {
10736                                 for (j = 0; j < selector->num_entries; j++) {
10737                                         if (mergeable && selector->right_edge) {
10738                                                 /*
10739                                                  * do a merge by NOT setting
10740                                                  * the left side
10741                                                  */
10742                                                 mergeable = 0;
10743                                         } else {
10744                                                 /*
10745                                                  * no merge, set the left
10746                                                  * side
10747                                                  */
10748                                                 mergeable = 0;
10749                                                 gap_descriptor->start = htons((selector->gaps[j].start + offset));
10750                                         }
10751                                         gap_descriptor->end = htons((selector->gaps[j].end + offset));
10752                                         num_gap_blocks++;
10753                                         gap_descriptor++;
10754                                         if (((caddr_t)gap_descriptor + sizeof(struct sctp_gap_ack_block)) > limit) {
10755                                                 /* no more room */
10756                                                 limit_reached = 1;
10757                                                 break;
10758                                         }
10759                                 }
10760                                 if (selector->left_edge) {
10761                                         mergeable = 1;
10762                                 }
10763                         }
10764                         if (limit_reached) {
10765                                 /* Reached the limit stop */
10766                                 break;
10767                         }
10768                         offset += 8;
10769                 }
10770         }
10771         if ((type == SCTP_NR_SELECTIVE_ACK) &&
10772             (limit_reached == 0)) {
10773                 mergeable = 0;
10774
10775                 if (asoc->highest_tsn_inside_nr_map > asoc->mapping_array_base_tsn) {
10776                         siz = (((asoc->highest_tsn_inside_nr_map - asoc->mapping_array_base_tsn) + 1) + 7) / 8;
10777                 } else {
10778                         siz = (((MAX_TSN - asoc->mapping_array_base_tsn) + 1) + asoc->highest_tsn_inside_nr_map + 7) / 8;
10779                 }
10780
10781                 if (SCTP_TSN_GT(asoc->mapping_array_base_tsn, asoc->cumulative_tsn)) {
10782                         offset = 1;
10783                 } else {
10784                         offset = asoc->mapping_array_base_tsn - asoc->cumulative_tsn;
10785                 }
10786                 if (SCTP_TSN_GT(asoc->highest_tsn_inside_nr_map, asoc->cumulative_tsn)) {
10787                         /* we have a gap .. maybe */
10788                         for (i = 0; i < siz; i++) {
10789                                 tsn_map = asoc->nr_mapping_array[i];
10790                                 if (i == 0) {
10791                                         /*
10792                                          * Clear all bits corresponding to
10793                                          * TSNs smaller or equal to the
10794                                          * cumulative TSN.
10795                                          */
10796                                         tsn_map &= (~0U << (1 - offset));
10797                                 }
10798                                 selector = &sack_array[tsn_map];
10799                                 if (mergeable && selector->right_edge) {
10800                                         /*
10801                                          * Backup, left and right edges were
10802                                          * ok to merge.
10803                                          */
10804                                         num_nr_gap_blocks--;
10805                                         gap_descriptor--;
10806                                 }
10807                                 if (selector->num_entries == 0)
10808                                         mergeable = 0;
10809                                 else {
10810                                         for (j = 0; j < selector->num_entries; j++) {
10811                                                 if (mergeable && selector->right_edge) {
10812                                                         /*
10813                                                          * do a merge by NOT
10814                                                          * setting the left
10815                                                          * side
10816                                                          */
10817                                                         mergeable = 0;
10818                                                 } else {
10819                                                         /*
10820                                                          * no merge, set the
10821                                                          * left side
10822                                                          */
10823                                                         mergeable = 0;
10824                                                         gap_descriptor->start = htons((selector->gaps[j].start + offset));
10825                                                 }
10826                                                 gap_descriptor->end = htons((selector->gaps[j].end + offset));
10827                                                 num_nr_gap_blocks++;
10828                                                 gap_descriptor++;
10829                                                 if (((caddr_t)gap_descriptor + sizeof(struct sctp_gap_ack_block)) > limit) {
10830                                                         /* no more room */
10831                                                         limit_reached = 1;
10832                                                         break;
10833                                                 }
10834                                         }
10835                                         if (selector->left_edge) {
10836                                                 mergeable = 1;
10837                                         }
10838                                 }
10839                                 if (limit_reached) {
10840                                         /* Reached the limit stop */
10841                                         break;
10842                                 }
10843                                 offset += 8;
10844                         }
10845                 }
10846         }
10847         /* now we must add any dups we are going to report. */
10848         if ((limit_reached == 0) && (asoc->numduptsns)) {
10849                 dup = (uint32_t *)gap_descriptor;
10850                 for (i = 0; i < asoc->numduptsns; i++) {
10851                         *dup = htonl(asoc->dup_tsns[i]);
10852                         dup++;
10853                         num_dups++;
10854                         if (((caddr_t)dup + sizeof(uint32_t)) > limit) {
10855                                 /* no more room */
10856                                 break;
10857                         }
10858                 }
10859                 asoc->numduptsns = 0;
10860         }
10861         /*
10862          * now that the chunk is prepared queue it to the control chunk
10863          * queue.
10864          */
10865         if (type == SCTP_SELECTIVE_ACK) {
10866                 a_chk->send_size = (uint16_t)(sizeof(struct sctp_sack_chunk) +
10867                     (num_gap_blocks + num_nr_gap_blocks) * sizeof(struct sctp_gap_ack_block) +
10868                     num_dups * sizeof(int32_t));
10869                 SCTP_BUF_LEN(a_chk->data) = a_chk->send_size;
10870                 sack->sack.cum_tsn_ack = htonl(asoc->cumulative_tsn);
10871                 sack->sack.a_rwnd = htonl(asoc->my_rwnd);
10872                 sack->sack.num_gap_ack_blks = htons(num_gap_blocks);
10873                 sack->sack.num_dup_tsns = htons(num_dups);
10874                 sack->ch.chunk_type = type;
10875                 sack->ch.chunk_flags = flags;
10876                 sack->ch.chunk_length = htons(a_chk->send_size);
10877         } else {
10878                 a_chk->send_size = (uint16_t)(sizeof(struct sctp_nr_sack_chunk) +
10879                     (num_gap_blocks + num_nr_gap_blocks) * sizeof(struct sctp_gap_ack_block) +
10880                     num_dups * sizeof(int32_t));
10881                 SCTP_BUF_LEN(a_chk->data) = a_chk->send_size;
10882                 nr_sack->nr_sack.cum_tsn_ack = htonl(asoc->cumulative_tsn);
10883                 nr_sack->nr_sack.a_rwnd = htonl(asoc->my_rwnd);
10884                 nr_sack->nr_sack.num_gap_ack_blks = htons(num_gap_blocks);
10885                 nr_sack->nr_sack.num_nr_gap_ack_blks = htons(num_nr_gap_blocks);
10886                 nr_sack->nr_sack.num_dup_tsns = htons(num_dups);
10887                 nr_sack->nr_sack.reserved = 0;
10888                 nr_sack->ch.chunk_type = type;
10889                 nr_sack->ch.chunk_flags = flags;
10890                 nr_sack->ch.chunk_length = htons(a_chk->send_size);
10891         }
10892         TAILQ_INSERT_TAIL(&asoc->control_send_queue, a_chk, sctp_next);
10893         asoc->my_last_reported_rwnd = asoc->my_rwnd;
10894         asoc->ctrl_queue_cnt++;
10895         asoc->send_sack = 0;
10896         SCTP_STAT_INCR(sctps_sendsacks);
10897         return;
10898 }
10899
10900 void
10901 sctp_send_abort_tcb(struct sctp_tcb *stcb, struct mbuf *operr, int so_locked)
10902 {
10903         struct mbuf *m_abort, *m, *m_last;
10904         struct mbuf *m_out, *m_end = NULL;
10905         struct sctp_abort_chunk *abort;
10906         struct sctp_auth_chunk *auth = NULL;
10907         struct sctp_nets *net;
10908         uint32_t vtag;
10909         uint32_t auth_offset = 0;
10910         int error;
10911         uint16_t cause_len, chunk_len, padding_len;
10912         bool use_zero_crc;
10913
10914         SCTP_TCB_LOCK_ASSERT(stcb);
10915         /*-
10916          * Add an AUTH chunk, if chunk requires it and save the offset into
10917          * the chain for AUTH
10918          */
10919         if (sctp_auth_is_required_chunk(SCTP_ABORT_ASSOCIATION,
10920             stcb->asoc.peer_auth_chunks)) {
10921                 m_out = sctp_add_auth_chunk(NULL, &m_end, &auth, &auth_offset,
10922                     stcb, SCTP_ABORT_ASSOCIATION);
10923                 SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
10924         } else {
10925                 m_out = NULL;
10926         }
10927         switch (stcb->asoc.snd_edmid) {
10928         case SCTP_EDMID_LOWER_LAYER_DTLS:
10929                 use_zero_crc = true;
10930                 break;
10931         default:
10932                 use_zero_crc = false;
10933                 break;
10934         }
10935         m_abort = sctp_get_mbuf_for_msg(sizeof(struct sctp_abort_chunk), 0, M_NOWAIT, 1, MT_HEADER);
10936         if (m_abort == NULL) {
10937                 if (m_out) {
10938                         sctp_m_freem(m_out);
10939                 }
10940                 if (operr) {
10941                         sctp_m_freem(operr);
10942                 }
10943                 return;
10944         }
10945         /* link in any error */
10946         SCTP_BUF_NEXT(m_abort) = operr;
10947         cause_len = 0;
10948         m_last = NULL;
10949         for (m = operr; m; m = SCTP_BUF_NEXT(m)) {
10950                 cause_len += (uint16_t)SCTP_BUF_LEN(m);
10951                 if (SCTP_BUF_NEXT(m) == NULL) {
10952                         m_last = m;
10953                 }
10954         }
10955         SCTP_BUF_LEN(m_abort) = sizeof(struct sctp_abort_chunk);
10956         chunk_len = (uint16_t)sizeof(struct sctp_abort_chunk) + cause_len;
10957         padding_len = SCTP_SIZE32(chunk_len) - chunk_len;
10958         if (m_out == NULL) {
10959                 /* NO Auth chunk prepended, so reserve space in front */
10960                 SCTP_BUF_RESV_UF(m_abort, SCTP_MIN_OVERHEAD);
10961                 m_out = m_abort;
10962         } else {
10963                 /* Put AUTH chunk at the front of the chain */
10964                 SCTP_BUF_NEXT(m_end) = m_abort;
10965         }
10966         if (stcb->asoc.alternate) {
10967                 net = stcb->asoc.alternate;
10968         } else {
10969                 net = stcb->asoc.primary_destination;
10970         }
10971         /* Fill in the ABORT chunk header. */
10972         abort = mtod(m_abort, struct sctp_abort_chunk *);
10973         abort->ch.chunk_type = SCTP_ABORT_ASSOCIATION;
10974         if (stcb->asoc.peer_vtag == 0) {
10975                 /* This happens iff the assoc is in COOKIE-WAIT state. */
10976                 vtag = stcb->asoc.my_vtag;
10977                 abort->ch.chunk_flags = SCTP_HAD_NO_TCB;
10978         } else {
10979                 vtag = stcb->asoc.peer_vtag;
10980                 abort->ch.chunk_flags = 0;
10981         }
10982         abort->ch.chunk_length = htons(chunk_len);
10983         /* Add padding, if necessary. */
10984         if (padding_len > 0) {
10985                 if ((m_last == NULL) ||
10986                     (sctp_add_pad_tombuf(m_last, padding_len) == NULL)) {
10987                         sctp_m_freem(m_out);
10988                         return;
10989                 }
10990         }
10991         if ((error = sctp_lowlevel_chunk_output(stcb->sctp_ep, stcb, net,
10992             (struct sockaddr *)&net->ro._l_addr,
10993             m_out, auth_offset, auth, stcb->asoc.authinfo.active_keyid, 1, 0, 0,
10994             stcb->sctp_ep->sctp_lport, stcb->rport, htonl(vtag),
10995             stcb->asoc.primary_destination->port, NULL,
10996             0, 0,
10997             use_zero_crc,
10998             so_locked))) {
10999                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
11000                 if (error == ENOBUFS) {
11001                         stcb->asoc.ifp_had_enobuf = 1;
11002                         SCTP_STAT_INCR(sctps_lowlevelerr);
11003                 }
11004         } else {
11005                 stcb->asoc.ifp_had_enobuf = 0;
11006         }
11007         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
11008 }
11009
11010 void
11011 sctp_send_shutdown_complete(struct sctp_tcb *stcb,
11012     struct sctp_nets *net,
11013     int reflect_vtag)
11014 {
11015         /* formulate and SEND a SHUTDOWN-COMPLETE */
11016         struct mbuf *m_shutdown_comp;
11017         struct sctp_shutdown_complete_chunk *shutdown_complete;
11018         uint32_t vtag;
11019         int error;
11020         uint8_t flags;
11021         bool use_zero_crc;
11022
11023         m_shutdown_comp = sctp_get_mbuf_for_msg(sizeof(struct sctp_chunkhdr), 0, M_NOWAIT, 1, MT_HEADER);
11024         if (m_shutdown_comp == NULL) {
11025                 /* no mbuf's */
11026                 return;
11027         }
11028         if (reflect_vtag) {
11029                 flags = SCTP_HAD_NO_TCB;
11030                 vtag = stcb->asoc.my_vtag;
11031         } else {
11032                 flags = 0;
11033                 vtag = stcb->asoc.peer_vtag;
11034         }
11035         switch (stcb->asoc.snd_edmid) {
11036         case SCTP_EDMID_LOWER_LAYER_DTLS:
11037                 use_zero_crc = true;
11038                 break;
11039         default:
11040                 use_zero_crc = false;
11041                 break;
11042         }
11043         shutdown_complete = mtod(m_shutdown_comp, struct sctp_shutdown_complete_chunk *);
11044         shutdown_complete->ch.chunk_type = SCTP_SHUTDOWN_COMPLETE;
11045         shutdown_complete->ch.chunk_flags = flags;
11046         shutdown_complete->ch.chunk_length = htons(sizeof(struct sctp_shutdown_complete_chunk));
11047         SCTP_BUF_LEN(m_shutdown_comp) = sizeof(struct sctp_shutdown_complete_chunk);
11048         if ((error = sctp_lowlevel_chunk_output(stcb->sctp_ep, stcb, net,
11049             (struct sockaddr *)&net->ro._l_addr,
11050             m_shutdown_comp, 0, NULL, 0, 1, 0, 0,
11051             stcb->sctp_ep->sctp_lport, stcb->rport,
11052             htonl(vtag),
11053             net->port, NULL,
11054             0, 0,
11055             use_zero_crc,
11056             SCTP_SO_NOT_LOCKED))) {
11057                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
11058                 if (error == ENOBUFS) {
11059                         stcb->asoc.ifp_had_enobuf = 1;
11060                         SCTP_STAT_INCR(sctps_lowlevelerr);
11061                 }
11062         } else {
11063                 stcb->asoc.ifp_had_enobuf = 0;
11064         }
11065         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
11066         return;
11067 }
11068
11069 static void
11070 sctp_send_resp_msg(struct sockaddr *src, struct sockaddr *dst,
11071     struct sctphdr *sh, uint32_t vtag,
11072     uint8_t type, struct mbuf *cause,
11073     uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum,
11074     uint32_t vrf_id, uint16_t port)
11075 {
11076         struct mbuf *o_pak;
11077         struct mbuf *mout;
11078         struct sctphdr *shout;
11079         struct sctp_chunkhdr *ch;
11080 #if defined(INET) || defined(INET6)
11081         struct udphdr *udp;
11082 #endif
11083         int ret, len, cause_len, padding_len;
11084 #ifdef INET
11085         struct sockaddr_in *src_sin, *dst_sin;
11086         struct ip *ip;
11087 #endif
11088 #ifdef INET6
11089         struct sockaddr_in6 *src_sin6, *dst_sin6;
11090         struct ip6_hdr *ip6;
11091 #endif
11092
11093         /* Compute the length of the cause and add final padding. */
11094         cause_len = 0;
11095         if (cause != NULL) {
11096                 struct mbuf *m_at, *m_last = NULL;
11097
11098                 for (m_at = cause; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
11099                         if (SCTP_BUF_NEXT(m_at) == NULL)
11100                                 m_last = m_at;
11101                         cause_len += SCTP_BUF_LEN(m_at);
11102                 }
11103                 padding_len = cause_len % 4;
11104                 if (padding_len != 0) {
11105                         padding_len = 4 - padding_len;
11106                 }
11107                 if (padding_len != 0) {
11108                         if (sctp_add_pad_tombuf(m_last, padding_len) == NULL) {
11109                                 sctp_m_freem(cause);
11110                                 return;
11111                         }
11112                 }
11113         } else {
11114                 padding_len = 0;
11115         }
11116         /* Get an mbuf for the header. */
11117         len = sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
11118         switch (dst->sa_family) {
11119 #ifdef INET
11120         case AF_INET:
11121                 len += sizeof(struct ip);
11122                 break;
11123 #endif
11124 #ifdef INET6
11125         case AF_INET6:
11126                 len += sizeof(struct ip6_hdr);
11127                 break;
11128 #endif
11129         default:
11130                 break;
11131         }
11132 #if defined(INET) || defined(INET6)
11133         if (port) {
11134                 len += sizeof(struct udphdr);
11135         }
11136 #endif
11137         mout = sctp_get_mbuf_for_msg(len + max_linkhdr, 1, M_NOWAIT, 1, MT_DATA);
11138         if (mout == NULL) {
11139                 if (cause) {
11140                         sctp_m_freem(cause);
11141                 }
11142                 return;
11143         }
11144         SCTP_BUF_RESV_UF(mout, max_linkhdr);
11145         SCTP_BUF_LEN(mout) = len;
11146         SCTP_BUF_NEXT(mout) = cause;
11147         M_SETFIB(mout, fibnum);
11148         mout->m_pkthdr.flowid = mflowid;
11149         M_HASHTYPE_SET(mout, mflowtype);
11150 #ifdef INET
11151         ip = NULL;
11152 #endif
11153 #ifdef INET6
11154         ip6 = NULL;
11155 #endif
11156         switch (dst->sa_family) {
11157 #ifdef INET
11158         case AF_INET:
11159                 src_sin = (struct sockaddr_in *)src;
11160                 dst_sin = (struct sockaddr_in *)dst;
11161                 ip = mtod(mout, struct ip *);
11162                 ip->ip_v = IPVERSION;
11163                 ip->ip_hl = (sizeof(struct ip) >> 2);
11164                 ip->ip_tos = 0;
11165                 ip->ip_off = htons(IP_DF);
11166                 ip_fillid(ip);
11167                 ip->ip_ttl = MODULE_GLOBAL(ip_defttl);
11168                 if (port) {
11169                         ip->ip_p = IPPROTO_UDP;
11170                 } else {
11171                         ip->ip_p = IPPROTO_SCTP;
11172                 }
11173                 ip->ip_src.s_addr = dst_sin->sin_addr.s_addr;
11174                 ip->ip_dst.s_addr = src_sin->sin_addr.s_addr;
11175                 ip->ip_sum = 0;
11176                 len = sizeof(struct ip);
11177                 shout = (struct sctphdr *)((caddr_t)ip + len);
11178                 break;
11179 #endif
11180 #ifdef INET6
11181         case AF_INET6:
11182                 src_sin6 = (struct sockaddr_in6 *)src;
11183                 dst_sin6 = (struct sockaddr_in6 *)dst;
11184                 ip6 = mtod(mout, struct ip6_hdr *);
11185                 ip6->ip6_flow = htonl(0x60000000);
11186                 if (V_ip6_auto_flowlabel) {
11187                         ip6->ip6_flow |= (htonl(ip6_randomflowlabel()) & IPV6_FLOWLABEL_MASK);
11188                 }
11189                 ip6->ip6_hlim = MODULE_GLOBAL(ip6_defhlim);
11190                 if (port) {
11191                         ip6->ip6_nxt = IPPROTO_UDP;
11192                 } else {
11193                         ip6->ip6_nxt = IPPROTO_SCTP;
11194                 }
11195                 ip6->ip6_src = dst_sin6->sin6_addr;
11196                 ip6->ip6_dst = src_sin6->sin6_addr;
11197                 len = sizeof(struct ip6_hdr);
11198                 shout = (struct sctphdr *)((caddr_t)ip6 + len);
11199                 break;
11200 #endif
11201         default:
11202                 len = 0;
11203                 shout = mtod(mout, struct sctphdr *);
11204                 break;
11205         }
11206 #if defined(INET) || defined(INET6)
11207         if (port) {
11208                 if (htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port)) == 0) {
11209                         sctp_m_freem(mout);
11210                         return;
11211                 }
11212                 udp = (struct udphdr *)shout;
11213                 udp->uh_sport = htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port));
11214                 udp->uh_dport = port;
11215                 udp->uh_sum = 0;
11216                 udp->uh_ulen = htons((uint16_t)(sizeof(struct udphdr) +
11217                     sizeof(struct sctphdr) +
11218                     sizeof(struct sctp_chunkhdr) +
11219                     cause_len + padding_len));
11220                 len += sizeof(struct udphdr);
11221                 shout = (struct sctphdr *)((caddr_t)shout + sizeof(struct udphdr));
11222         } else {
11223                 udp = NULL;
11224         }
11225 #endif
11226         shout->src_port = sh->dest_port;
11227         shout->dest_port = sh->src_port;
11228         shout->checksum = 0;
11229         if (vtag) {
11230                 shout->v_tag = htonl(vtag);
11231         } else {
11232                 shout->v_tag = sh->v_tag;
11233         }
11234         len += sizeof(struct sctphdr);
11235         ch = (struct sctp_chunkhdr *)((caddr_t)shout + sizeof(struct sctphdr));
11236         ch->chunk_type = type;
11237         if (vtag) {
11238                 ch->chunk_flags = 0;
11239         } else {
11240                 ch->chunk_flags = SCTP_HAD_NO_TCB;
11241         }
11242         ch->chunk_length = htons((uint16_t)(sizeof(struct sctp_chunkhdr) + cause_len));
11243         len += sizeof(struct sctp_chunkhdr);
11244         len += cause_len + padding_len;
11245
11246         if (SCTP_GET_HEADER_FOR_OUTPUT(o_pak)) {
11247                 sctp_m_freem(mout);
11248                 return;
11249         }
11250         SCTP_ATTACH_CHAIN(o_pak, mout, len);
11251         switch (dst->sa_family) {
11252 #ifdef INET
11253         case AF_INET:
11254                 if (port) {
11255                         if (V_udp_cksum) {
11256                                 udp->uh_sum = in_pseudo(ip->ip_src.s_addr, ip->ip_dst.s_addr, udp->uh_ulen + htons(IPPROTO_UDP));
11257                         } else {
11258                                 udp->uh_sum = 0;
11259                         }
11260                 }
11261                 ip->ip_len = htons(len);
11262                 if (port) {
11263                         shout->checksum = sctp_calculate_cksum(mout, sizeof(struct ip) + sizeof(struct udphdr));
11264                         SCTP_STAT_INCR(sctps_sendswcrc);
11265                         if (V_udp_cksum) {
11266                                 SCTP_ENABLE_UDP_CSUM(o_pak);
11267                         }
11268                 } else {
11269                         mout->m_pkthdr.csum_flags = CSUM_SCTP;
11270                         mout->m_pkthdr.csum_data = offsetof(struct sctphdr, checksum);
11271                         SCTP_STAT_INCR(sctps_sendhwcrc);
11272                 }
11273 #ifdef SCTP_PACKET_LOGGING
11274                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING) {
11275                         sctp_packet_log(o_pak);
11276                 }
11277 #endif
11278                 SCTP_PROBE5(send, NULL, NULL, ip, NULL, shout);
11279                 SCTP_IP_OUTPUT(ret, o_pak, NULL, NULL, vrf_id);
11280                 break;
11281 #endif
11282 #ifdef INET6
11283         case AF_INET6:
11284                 ip6->ip6_plen = htons((uint16_t)(len - sizeof(struct ip6_hdr)));
11285                 if (port) {
11286                         shout->checksum = sctp_calculate_cksum(mout, sizeof(struct ip6_hdr) + sizeof(struct udphdr));
11287                         SCTP_STAT_INCR(sctps_sendswcrc);
11288                         if ((udp->uh_sum = in6_cksum(o_pak, IPPROTO_UDP, sizeof(struct ip6_hdr), len - sizeof(struct ip6_hdr))) == 0) {
11289                                 udp->uh_sum = 0xffff;
11290                         }
11291                 } else {
11292                         mout->m_pkthdr.csum_flags = CSUM_SCTP_IPV6;
11293                         mout->m_pkthdr.csum_data = offsetof(struct sctphdr, checksum);
11294                         SCTP_STAT_INCR(sctps_sendhwcrc);
11295                 }
11296 #ifdef SCTP_PACKET_LOGGING
11297                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING) {
11298                         sctp_packet_log(o_pak);
11299                 }
11300 #endif
11301                 SCTP_PROBE5(send, NULL, NULL, ip6, NULL, shout);
11302                 SCTP_IP6_OUTPUT(ret, o_pak, NULL, NULL, NULL, vrf_id);
11303                 break;
11304 #endif
11305         default:
11306                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Unknown protocol (TSNH) type %d\n",
11307                     dst->sa_family);
11308                 sctp_m_freem(mout);
11309                 SCTP_LTRACE_ERR_RET_PKT(mout, NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EFAULT);
11310                 return;
11311         }
11312         SCTPDBG(SCTP_DEBUG_OUTPUT3, "return from send is %d\n", ret);
11313         if (port) {
11314                 UDPSTAT_INC(udps_opackets);
11315         }
11316         SCTP_STAT_INCR(sctps_sendpackets);
11317         SCTP_STAT_INCR_COUNTER64(sctps_outpackets);
11318         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
11319         if (ret) {
11320                 SCTP_STAT_INCR(sctps_senderrors);
11321         }
11322         return;
11323 }
11324
11325 void
11326 sctp_send_shutdown_complete2(struct sockaddr *src, struct sockaddr *dst,
11327     struct sctphdr *sh,
11328     uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum,
11329     uint32_t vrf_id, uint16_t port)
11330 {
11331         sctp_send_resp_msg(src, dst, sh, 0, SCTP_SHUTDOWN_COMPLETE, NULL,
11332             mflowtype, mflowid, fibnum,
11333             vrf_id, port);
11334 }
11335
11336 void
11337 sctp_send_hb(struct sctp_tcb *stcb, struct sctp_nets *net, int so_locked)
11338 {
11339         struct sctp_tmit_chunk *chk;
11340         struct sctp_heartbeat_chunk *hb;
11341         struct timeval now;
11342
11343         SCTP_TCB_LOCK_ASSERT(stcb);
11344         if (net == NULL) {
11345                 return;
11346         }
11347         (void)SCTP_GETTIME_TIMEVAL(&now);
11348         switch (net->ro._l_addr.sa.sa_family) {
11349 #ifdef INET
11350         case AF_INET:
11351                 break;
11352 #endif
11353 #ifdef INET6
11354         case AF_INET6:
11355                 break;
11356 #endif
11357         default:
11358                 return;
11359         }
11360         sctp_alloc_a_chunk(stcb, chk);
11361         if (chk == NULL) {
11362                 SCTPDBG(SCTP_DEBUG_OUTPUT4, "Gak, can't get a chunk for hb\n");
11363                 return;
11364         }
11365
11366         chk->copy_by_ref = 0;
11367         chk->rec.chunk_id.id = SCTP_HEARTBEAT_REQUEST;
11368         chk->rec.chunk_id.can_take_data = 1;
11369         chk->flags = 0;
11370         chk->asoc = &stcb->asoc;
11371         chk->send_size = sizeof(struct sctp_heartbeat_chunk);
11372
11373         chk->data = sctp_get_mbuf_for_msg(chk->send_size, 0, M_NOWAIT, 1, MT_HEADER);
11374         if (chk->data == NULL) {
11375                 sctp_free_a_chunk(stcb, chk, so_locked);
11376                 return;
11377         }
11378         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11379         SCTP_BUF_LEN(chk->data) = chk->send_size;
11380         chk->sent = SCTP_DATAGRAM_UNSENT;
11381         chk->snd_count = 0;
11382         chk->whoTo = net;
11383         atomic_add_int(&chk->whoTo->ref_count, 1);
11384         /* Now we have a mbuf that we can fill in with the details */
11385         hb = mtod(chk->data, struct sctp_heartbeat_chunk *);
11386         memset(hb, 0, sizeof(struct sctp_heartbeat_chunk));
11387         /* fill out chunk header */
11388         hb->ch.chunk_type = SCTP_HEARTBEAT_REQUEST;
11389         hb->ch.chunk_flags = 0;
11390         hb->ch.chunk_length = htons(chk->send_size);
11391         /* Fill out hb parameter */
11392         hb->heartbeat.hb_info.ph.param_type = htons(SCTP_HEARTBEAT_INFO);
11393         hb->heartbeat.hb_info.ph.param_length = htons(sizeof(struct sctp_heartbeat_info_param));
11394         hb->heartbeat.hb_info.time_value_1 = (uint32_t)now.tv_sec;
11395         hb->heartbeat.hb_info.time_value_2 = now.tv_usec;
11396         /* Did our user request this one, put it in */
11397         hb->heartbeat.hb_info.addr_family = (uint8_t)net->ro._l_addr.sa.sa_family;
11398         hb->heartbeat.hb_info.addr_len = net->ro._l_addr.sa.sa_len;
11399         if (net->dest_state & SCTP_ADDR_UNCONFIRMED) {
11400                 /*
11401                  * we only take from the entropy pool if the address is not
11402                  * confirmed.
11403                  */
11404                 net->heartbeat_random1 = hb->heartbeat.hb_info.random_value1 = sctp_select_initial_TSN(&stcb->sctp_ep->sctp_ep);
11405                 net->heartbeat_random2 = hb->heartbeat.hb_info.random_value2 = sctp_select_initial_TSN(&stcb->sctp_ep->sctp_ep);
11406         } else {
11407                 net->heartbeat_random1 = hb->heartbeat.hb_info.random_value1 = 0;
11408                 net->heartbeat_random2 = hb->heartbeat.hb_info.random_value2 = 0;
11409         }
11410         switch (net->ro._l_addr.sa.sa_family) {
11411 #ifdef INET
11412         case AF_INET:
11413                 memcpy(hb->heartbeat.hb_info.address,
11414                     &net->ro._l_addr.sin.sin_addr,
11415                     sizeof(net->ro._l_addr.sin.sin_addr));
11416                 break;
11417 #endif
11418 #ifdef INET6
11419         case AF_INET6:
11420                 memcpy(hb->heartbeat.hb_info.address,
11421                     &net->ro._l_addr.sin6.sin6_addr,
11422                     sizeof(net->ro._l_addr.sin6.sin6_addr));
11423                 break;
11424 #endif
11425         default:
11426                 if (chk->data) {
11427                         sctp_m_freem(chk->data);
11428                         chk->data = NULL;
11429                 }
11430                 sctp_free_a_chunk(stcb, chk, so_locked);
11431                 return;
11432                 break;
11433         }
11434         net->hb_responded = 0;
11435         TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
11436         stcb->asoc.ctrl_queue_cnt++;
11437         SCTP_STAT_INCR(sctps_sendheartbeat);
11438         return;
11439 }
11440
11441 void
11442 sctp_send_ecn_echo(struct sctp_tcb *stcb, struct sctp_nets *net,
11443     uint32_t high_tsn)
11444 {
11445         struct sctp_association *asoc;
11446         struct sctp_ecne_chunk *ecne;
11447         struct sctp_tmit_chunk *chk;
11448
11449         if (net == NULL) {
11450                 return;
11451         }
11452         asoc = &stcb->asoc;
11453         SCTP_TCB_LOCK_ASSERT(stcb);
11454         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
11455                 if ((chk->rec.chunk_id.id == SCTP_ECN_ECHO) && (net == chk->whoTo)) {
11456                         /* found a previous ECN_ECHO update it if needed */
11457                         uint32_t cnt, ctsn;
11458
11459                         ecne = mtod(chk->data, struct sctp_ecne_chunk *);
11460                         ctsn = ntohl(ecne->tsn);
11461                         if (SCTP_TSN_GT(high_tsn, ctsn)) {
11462                                 ecne->tsn = htonl(high_tsn);
11463                                 SCTP_STAT_INCR(sctps_queue_upd_ecne);
11464                         }
11465                         cnt = ntohl(ecne->num_pkts_since_cwr);
11466                         cnt++;
11467                         ecne->num_pkts_since_cwr = htonl(cnt);
11468                         return;
11469                 }
11470         }
11471         /* nope could not find one to update so we must build one */
11472         sctp_alloc_a_chunk(stcb, chk);
11473         if (chk == NULL) {
11474                 return;
11475         }
11476         SCTP_STAT_INCR(sctps_queue_upd_ecne);
11477         chk->copy_by_ref = 0;
11478         chk->rec.chunk_id.id = SCTP_ECN_ECHO;
11479         chk->rec.chunk_id.can_take_data = 0;
11480         chk->flags = 0;
11481         chk->asoc = &stcb->asoc;
11482         chk->send_size = sizeof(struct sctp_ecne_chunk);
11483         chk->data = sctp_get_mbuf_for_msg(chk->send_size, 0, M_NOWAIT, 1, MT_HEADER);
11484         if (chk->data == NULL) {
11485                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
11486                 return;
11487         }
11488         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11489         SCTP_BUF_LEN(chk->data) = chk->send_size;
11490         chk->sent = SCTP_DATAGRAM_UNSENT;
11491         chk->snd_count = 0;
11492         chk->whoTo = net;
11493         atomic_add_int(&chk->whoTo->ref_count, 1);
11494
11495         stcb->asoc.ecn_echo_cnt_onq++;
11496         ecne = mtod(chk->data, struct sctp_ecne_chunk *);
11497         ecne->ch.chunk_type = SCTP_ECN_ECHO;
11498         ecne->ch.chunk_flags = 0;
11499         ecne->ch.chunk_length = htons(sizeof(struct sctp_ecne_chunk));
11500         ecne->tsn = htonl(high_tsn);
11501         ecne->num_pkts_since_cwr = htonl(1);
11502         TAILQ_INSERT_HEAD(&stcb->asoc.control_send_queue, chk, sctp_next);
11503         asoc->ctrl_queue_cnt++;
11504 }
11505
11506 void
11507 sctp_send_packet_dropped(struct sctp_tcb *stcb, struct sctp_nets *net,
11508     struct mbuf *m, int len, int iphlen, int bad_crc)
11509 {
11510         struct sctp_association *asoc;
11511         struct sctp_pktdrop_chunk *drp;
11512         struct sctp_tmit_chunk *chk;
11513         uint8_t *datap;
11514         int was_trunc = 0;
11515         int fullsz = 0;
11516         long spc;
11517         int offset;
11518         struct sctp_chunkhdr *ch, chunk_buf;
11519         unsigned int chk_length;
11520
11521         if (!stcb) {
11522                 return;
11523         }
11524         asoc = &stcb->asoc;
11525         SCTP_TCB_LOCK_ASSERT(stcb);
11526         if (asoc->pktdrop_supported == 0) {
11527                 /*-
11528                  * peer must declare support before I send one.
11529                  */
11530                 return;
11531         }
11532         if (stcb->sctp_socket == NULL) {
11533                 return;
11534         }
11535         sctp_alloc_a_chunk(stcb, chk);
11536         if (chk == NULL) {
11537                 return;
11538         }
11539         chk->copy_by_ref = 0;
11540         chk->rec.chunk_id.id = SCTP_PACKET_DROPPED;
11541         chk->rec.chunk_id.can_take_data = 1;
11542         chk->flags = 0;
11543         len -= iphlen;
11544         chk->send_size = len;
11545         /* Validate that we do not have an ABORT in here. */
11546         offset = iphlen + sizeof(struct sctphdr);
11547         ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, offset,
11548             sizeof(*ch), (uint8_t *)&chunk_buf);
11549         while (ch != NULL) {
11550                 chk_length = ntohs(ch->chunk_length);
11551                 if (chk_length < sizeof(*ch)) {
11552                         /* break to abort land */
11553                         break;
11554                 }
11555                 switch (ch->chunk_type) {
11556                 case SCTP_PACKET_DROPPED:
11557                 case SCTP_ABORT_ASSOCIATION:
11558                 case SCTP_INITIATION_ACK:
11559                         /**
11560                          * We don't respond with an PKT-DROP to an ABORT
11561                          * or PKT-DROP. We also do not respond to an
11562                          * INIT-ACK, because we can't know if the initiation
11563                          * tag is correct or not.
11564                          */
11565                         sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
11566                         return;
11567                 default:
11568                         break;
11569                 }
11570                 offset += SCTP_SIZE32(chk_length);
11571                 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, offset,
11572                     sizeof(*ch), (uint8_t *)&chunk_buf);
11573         }
11574
11575         if ((len + SCTP_MAX_OVERHEAD + sizeof(struct sctp_pktdrop_chunk)) >
11576             min(stcb->asoc.smallest_mtu, MCLBYTES)) {
11577                 /*
11578                  * only send 1 mtu worth, trim off the excess on the end.
11579                  */
11580                 fullsz = len;
11581                 len = min(stcb->asoc.smallest_mtu, MCLBYTES) - SCTP_MAX_OVERHEAD;
11582                 was_trunc = 1;
11583         }
11584         chk->asoc = &stcb->asoc;
11585         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
11586         if (chk->data == NULL) {
11587 jump_out:
11588                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
11589                 return;
11590         }
11591         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11592         drp = mtod(chk->data, struct sctp_pktdrop_chunk *);
11593         if (drp == NULL) {
11594                 sctp_m_freem(chk->data);
11595                 chk->data = NULL;
11596                 goto jump_out;
11597         }
11598         chk->book_size = SCTP_SIZE32((chk->send_size + sizeof(struct sctp_pktdrop_chunk) +
11599             sizeof(struct sctphdr) + SCTP_MED_OVERHEAD));
11600         chk->book_size_scale = 0;
11601         if (was_trunc) {
11602                 drp->ch.chunk_flags = SCTP_PACKET_TRUNCATED;
11603                 drp->trunc_len = htons(fullsz);
11604                 /*
11605                  * Len is already adjusted to size minus overhead above take
11606                  * out the pkt_drop chunk itself from it.
11607                  */
11608                 chk->send_size = (uint16_t)(len - sizeof(struct sctp_pktdrop_chunk));
11609                 len = chk->send_size;
11610         } else {
11611                 /* no truncation needed */
11612                 drp->ch.chunk_flags = 0;
11613                 drp->trunc_len = htons(0);
11614         }
11615         if (bad_crc) {
11616                 drp->ch.chunk_flags |= SCTP_BADCRC;
11617         }
11618         chk->send_size += sizeof(struct sctp_pktdrop_chunk);
11619         SCTP_BUF_LEN(chk->data) = chk->send_size;
11620         chk->sent = SCTP_DATAGRAM_UNSENT;
11621         chk->snd_count = 0;
11622         if (net) {
11623                 /* we should hit here */
11624                 chk->whoTo = net;
11625                 atomic_add_int(&chk->whoTo->ref_count, 1);
11626         } else {
11627                 chk->whoTo = NULL;
11628         }
11629         drp->ch.chunk_type = SCTP_PACKET_DROPPED;
11630         drp->ch.chunk_length = htons(chk->send_size);
11631         spc = SCTP_SB_LIMIT_RCV(stcb->sctp_socket);
11632         if (spc < 0) {
11633                 spc = 0;
11634         }
11635         drp->bottle_bw = htonl(spc);
11636         if (asoc->my_rwnd) {
11637                 drp->current_onq = htonl(asoc->size_on_reasm_queue +
11638                     asoc->size_on_all_streams +
11639                     asoc->my_rwnd_control_len +
11640                     SCTP_SBAVAIL(&stcb->sctp_socket->so_rcv));
11641         } else {
11642                 /*-
11643                  * If my rwnd is 0, possibly from mbuf depletion as well as
11644                  * space used, tell the peer there is NO space aka onq == bw
11645                  */
11646                 drp->current_onq = htonl(spc);
11647         }
11648         drp->reserved = 0;
11649         datap = drp->data;
11650         m_copydata(m, iphlen, len, (caddr_t)datap);
11651         TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
11652         asoc->ctrl_queue_cnt++;
11653 }
11654
11655 void
11656 sctp_send_cwr(struct sctp_tcb *stcb, struct sctp_nets *net, uint32_t high_tsn, uint8_t override)
11657 {
11658         struct sctp_association *asoc;
11659         struct sctp_cwr_chunk *cwr;
11660         struct sctp_tmit_chunk *chk;
11661
11662         SCTP_TCB_LOCK_ASSERT(stcb);
11663         if (net == NULL) {
11664                 return;
11665         }
11666         asoc = &stcb->asoc;
11667         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
11668                 if ((chk->rec.chunk_id.id == SCTP_ECN_CWR) && (net == chk->whoTo)) {
11669                         /*
11670                          * found a previous CWR queued to same destination
11671                          * update it if needed
11672                          */
11673                         uint32_t ctsn;
11674
11675                         cwr = mtod(chk->data, struct sctp_cwr_chunk *);
11676                         ctsn = ntohl(cwr->tsn);
11677                         if (SCTP_TSN_GT(high_tsn, ctsn)) {
11678                                 cwr->tsn = htonl(high_tsn);
11679                         }
11680                         if (override & SCTP_CWR_REDUCE_OVERRIDE) {
11681                                 /* Make sure override is carried */
11682                                 cwr->ch.chunk_flags |= SCTP_CWR_REDUCE_OVERRIDE;
11683                         }
11684                         return;
11685                 }
11686         }
11687         sctp_alloc_a_chunk(stcb, chk);
11688         if (chk == NULL) {
11689                 return;
11690         }
11691         chk->copy_by_ref = 0;
11692         chk->rec.chunk_id.id = SCTP_ECN_CWR;
11693         chk->rec.chunk_id.can_take_data = 1;
11694         chk->flags = 0;
11695         chk->asoc = asoc;
11696         chk->send_size = sizeof(struct sctp_cwr_chunk);
11697         chk->data = sctp_get_mbuf_for_msg(chk->send_size, 0, M_NOWAIT, 1, MT_HEADER);
11698         if (chk->data == NULL) {
11699                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
11700                 return;
11701         }
11702         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11703         SCTP_BUF_LEN(chk->data) = chk->send_size;
11704         chk->sent = SCTP_DATAGRAM_UNSENT;
11705         chk->snd_count = 0;
11706         chk->whoTo = net;
11707         atomic_add_int(&chk->whoTo->ref_count, 1);
11708         cwr = mtod(chk->data, struct sctp_cwr_chunk *);
11709         cwr->ch.chunk_type = SCTP_ECN_CWR;
11710         cwr->ch.chunk_flags = override;
11711         cwr->ch.chunk_length = htons(sizeof(struct sctp_cwr_chunk));
11712         cwr->tsn = htonl(high_tsn);
11713         TAILQ_INSERT_TAIL(&asoc->control_send_queue, chk, sctp_next);
11714         asoc->ctrl_queue_cnt++;
11715 }
11716
11717 static int
11718 sctp_add_stream_reset_out(struct sctp_tcb *stcb, struct sctp_tmit_chunk *chk,
11719     uint32_t seq, uint32_t resp_seq, uint32_t last_sent)
11720 {
11721         uint16_t len, old_len, i;
11722         struct sctp_stream_reset_out_request *req_out;
11723         struct sctp_chunkhdr *ch;
11724         int at;
11725         int number_entries = 0;
11726
11727         ch = mtod(chk->data, struct sctp_chunkhdr *);
11728         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11729         /* get to new offset for the param. */
11730         req_out = (struct sctp_stream_reset_out_request *)((caddr_t)ch + len);
11731         /* now how long will this param be? */
11732         for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
11733                 if ((stcb->asoc.strmout[i].state == SCTP_STREAM_RESET_PENDING) &&
11734                     (stcb->asoc.strmout[i].chunks_on_queues == 0) &&
11735                     TAILQ_EMPTY(&stcb->asoc.strmout[i].outqueue)) {
11736                         number_entries++;
11737                 }
11738         }
11739         if (number_entries == 0) {
11740                 return (0);
11741         }
11742         if (number_entries == stcb->asoc.streamoutcnt) {
11743                 number_entries = 0;
11744         }
11745         if (number_entries > SCTP_MAX_STREAMS_AT_ONCE_RESET) {
11746                 number_entries = SCTP_MAX_STREAMS_AT_ONCE_RESET;
11747         }
11748         len = (uint16_t)(sizeof(struct sctp_stream_reset_out_request) + (sizeof(uint16_t) * number_entries));
11749         req_out->ph.param_type = htons(SCTP_STR_RESET_OUT_REQUEST);
11750         req_out->ph.param_length = htons(len);
11751         req_out->request_seq = htonl(seq);
11752         req_out->response_seq = htonl(resp_seq);
11753         req_out->send_reset_at_tsn = htonl(last_sent);
11754         at = 0;
11755         if (number_entries) {
11756                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
11757                         if ((stcb->asoc.strmout[i].state == SCTP_STREAM_RESET_PENDING) &&
11758                             (stcb->asoc.strmout[i].chunks_on_queues == 0) &&
11759                             TAILQ_EMPTY(&stcb->asoc.strmout[i].outqueue)) {
11760                                 req_out->list_of_streams[at] = htons(i);
11761                                 at++;
11762                                 stcb->asoc.strmout[i].state = SCTP_STREAM_RESET_IN_FLIGHT;
11763                                 if (at >= number_entries) {
11764                                         break;
11765                                 }
11766                         }
11767                 }
11768         } else {
11769                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
11770                         stcb->asoc.strmout[i].state = SCTP_STREAM_RESET_IN_FLIGHT;
11771                 }
11772         }
11773         if (SCTP_SIZE32(len) > len) {
11774                 /*-
11775                  * Need to worry about the pad we may end up adding to the
11776                  * end. This is easy since the struct is either aligned to 4
11777                  * bytes or 2 bytes off.
11778                  */
11779                 req_out->list_of_streams[number_entries] = 0;
11780         }
11781         /* now fix the chunk length */
11782         ch->chunk_length = htons(len + old_len);
11783         chk->book_size = len + old_len;
11784         chk->book_size_scale = 0;
11785         chk->send_size = SCTP_SIZE32(chk->book_size);
11786         SCTP_BUF_LEN(chk->data) = chk->send_size;
11787         return (1);
11788 }
11789
11790 static void
11791 sctp_add_stream_reset_in(struct sctp_tmit_chunk *chk,
11792     int number_entries, uint16_t *list,
11793     uint32_t seq)
11794 {
11795         uint16_t len, old_len, i;
11796         struct sctp_stream_reset_in_request *req_in;
11797         struct sctp_chunkhdr *ch;
11798
11799         ch = mtod(chk->data, struct sctp_chunkhdr *);
11800         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11801
11802         /* get to new offset for the param. */
11803         req_in = (struct sctp_stream_reset_in_request *)((caddr_t)ch + len);
11804         /* now how long will this param be? */
11805         len = (uint16_t)(sizeof(struct sctp_stream_reset_in_request) + (sizeof(uint16_t) * number_entries));
11806         req_in->ph.param_type = htons(SCTP_STR_RESET_IN_REQUEST);
11807         req_in->ph.param_length = htons(len);
11808         req_in->request_seq = htonl(seq);
11809         if (number_entries) {
11810                 for (i = 0; i < number_entries; i++) {
11811                         req_in->list_of_streams[i] = htons(list[i]);
11812                 }
11813         }
11814         if (SCTP_SIZE32(len) > len) {
11815                 /*-
11816                  * Need to worry about the pad we may end up adding to the
11817                  * end. This is easy since the struct is either aligned to 4
11818                  * bytes or 2 bytes off.
11819                  */
11820                 req_in->list_of_streams[number_entries] = 0;
11821         }
11822         /* now fix the chunk length */
11823         ch->chunk_length = htons(len + old_len);
11824         chk->book_size = len + old_len;
11825         chk->book_size_scale = 0;
11826         chk->send_size = SCTP_SIZE32(chk->book_size);
11827         SCTP_BUF_LEN(chk->data) = chk->send_size;
11828         return;
11829 }
11830
11831 static void
11832 sctp_add_stream_reset_tsn(struct sctp_tmit_chunk *chk,
11833     uint32_t seq)
11834 {
11835         uint16_t len, old_len;
11836         struct sctp_stream_reset_tsn_request *req_tsn;
11837         struct sctp_chunkhdr *ch;
11838
11839         ch = mtod(chk->data, struct sctp_chunkhdr *);
11840         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11841
11842         /* get to new offset for the param. */
11843         req_tsn = (struct sctp_stream_reset_tsn_request *)((caddr_t)ch + len);
11844         /* now how long will this param be? */
11845         len = sizeof(struct sctp_stream_reset_tsn_request);
11846         req_tsn->ph.param_type = htons(SCTP_STR_RESET_TSN_REQUEST);
11847         req_tsn->ph.param_length = htons(len);
11848         req_tsn->request_seq = htonl(seq);
11849
11850         /* now fix the chunk length */
11851         ch->chunk_length = htons(len + old_len);
11852         chk->send_size = len + old_len;
11853         chk->book_size = SCTP_SIZE32(chk->send_size);
11854         chk->book_size_scale = 0;
11855         SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size);
11856         return;
11857 }
11858
11859 void
11860 sctp_add_stream_reset_result(struct sctp_tmit_chunk *chk,
11861     uint32_t resp_seq, uint32_t result)
11862 {
11863         uint16_t len, old_len;
11864         struct sctp_stream_reset_response *resp;
11865         struct sctp_chunkhdr *ch;
11866
11867         ch = mtod(chk->data, struct sctp_chunkhdr *);
11868         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11869
11870         /* get to new offset for the param. */
11871         resp = (struct sctp_stream_reset_response *)((caddr_t)ch + len);
11872         /* now how long will this param be? */
11873         len = sizeof(struct sctp_stream_reset_response);
11874         resp->ph.param_type = htons(SCTP_STR_RESET_RESPONSE);
11875         resp->ph.param_length = htons(len);
11876         resp->response_seq = htonl(resp_seq);
11877         resp->result = ntohl(result);
11878
11879         /* now fix the chunk length */
11880         ch->chunk_length = htons(len + old_len);
11881         chk->book_size = len + old_len;
11882         chk->book_size_scale = 0;
11883         chk->send_size = SCTP_SIZE32(chk->book_size);
11884         SCTP_BUF_LEN(chk->data) = chk->send_size;
11885         return;
11886 }
11887
11888 void
11889 sctp_send_deferred_reset_response(struct sctp_tcb *stcb,
11890     struct sctp_stream_reset_list *ent,
11891     int response)
11892 {
11893         struct sctp_association *asoc;
11894         struct sctp_tmit_chunk *chk;
11895         struct sctp_chunkhdr *ch;
11896
11897         asoc = &stcb->asoc;
11898
11899         /*
11900          * Reset our last reset action to the new one IP -> response
11901          * (PERFORMED probably). This assures that if we fail to send, a
11902          * retran from the peer will get the new response.
11903          */
11904         asoc->last_reset_action[0] = response;
11905         if (asoc->stream_reset_outstanding) {
11906                 return;
11907         }
11908         sctp_alloc_a_chunk(stcb, chk);
11909         if (chk == NULL) {
11910                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
11911                 return;
11912         }
11913         chk->copy_by_ref = 0;
11914         chk->rec.chunk_id.id = SCTP_STREAM_RESET;
11915         chk->rec.chunk_id.can_take_data = 0;
11916         chk->flags = 0;
11917         chk->asoc = &stcb->asoc;
11918         chk->book_size = sizeof(struct sctp_chunkhdr);
11919         chk->send_size = SCTP_SIZE32(chk->book_size);
11920         chk->book_size_scale = 0;
11921         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
11922         if (chk->data == NULL) {
11923                 sctp_free_a_chunk(stcb, chk, SCTP_SO_LOCKED);
11924                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
11925                 return;
11926         }
11927         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11928         /* setup chunk parameters */
11929         chk->sent = SCTP_DATAGRAM_UNSENT;
11930         chk->snd_count = 0;
11931         if (stcb->asoc.alternate) {
11932                 chk->whoTo = stcb->asoc.alternate;
11933         } else {
11934                 chk->whoTo = stcb->asoc.primary_destination;
11935         }
11936         ch = mtod(chk->data, struct sctp_chunkhdr *);
11937         ch->chunk_type = SCTP_STREAM_RESET;
11938         ch->chunk_flags = 0;
11939         ch->chunk_length = htons(chk->book_size);
11940         atomic_add_int(&chk->whoTo->ref_count, 1);
11941         SCTP_BUF_LEN(chk->data) = chk->send_size;
11942         sctp_add_stream_reset_result(chk, ent->seq, response);
11943         /* insert the chunk for sending */
11944         TAILQ_INSERT_TAIL(&asoc->control_send_queue,
11945             chk,
11946             sctp_next);
11947         asoc->ctrl_queue_cnt++;
11948 }
11949
11950 void
11951 sctp_add_stream_reset_result_tsn(struct sctp_tmit_chunk *chk,
11952     uint32_t resp_seq, uint32_t result,
11953     uint32_t send_una, uint32_t recv_next)
11954 {
11955         uint16_t len, old_len;
11956         struct sctp_stream_reset_response_tsn *resp;
11957         struct sctp_chunkhdr *ch;
11958
11959         ch = mtod(chk->data, struct sctp_chunkhdr *);
11960         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11961
11962         /* get to new offset for the param. */
11963         resp = (struct sctp_stream_reset_response_tsn *)((caddr_t)ch + len);
11964         /* now how long will this param be? */
11965         len = sizeof(struct sctp_stream_reset_response_tsn);
11966         resp->ph.param_type = htons(SCTP_STR_RESET_RESPONSE);
11967         resp->ph.param_length = htons(len);
11968         resp->response_seq = htonl(resp_seq);
11969         resp->result = htonl(result);
11970         resp->senders_next_tsn = htonl(send_una);
11971         resp->receivers_next_tsn = htonl(recv_next);
11972
11973         /* now fix the chunk length */
11974         ch->chunk_length = htons(len + old_len);
11975         chk->book_size = len + old_len;
11976         chk->send_size = SCTP_SIZE32(chk->book_size);
11977         chk->book_size_scale = 0;
11978         SCTP_BUF_LEN(chk->data) = chk->send_size;
11979         return;
11980 }
11981
11982 static void
11983 sctp_add_an_out_stream(struct sctp_tmit_chunk *chk,
11984     uint32_t seq,
11985     uint16_t adding)
11986 {
11987         uint16_t len, old_len;
11988         struct sctp_chunkhdr *ch;
11989         struct sctp_stream_reset_add_strm *addstr;
11990
11991         ch = mtod(chk->data, struct sctp_chunkhdr *);
11992         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11993
11994         /* get to new offset for the param. */
11995         addstr = (struct sctp_stream_reset_add_strm *)((caddr_t)ch + len);
11996         /* now how long will this param be? */
11997         len = sizeof(struct sctp_stream_reset_add_strm);
11998
11999         /* Fill it out. */
12000         addstr->ph.param_type = htons(SCTP_STR_RESET_ADD_OUT_STREAMS);
12001         addstr->ph.param_length = htons(len);
12002         addstr->request_seq = htonl(seq);
12003         addstr->number_of_streams = htons(adding);
12004         addstr->reserved = 0;
12005
12006         /* now fix the chunk length */
12007         ch->chunk_length = htons(len + old_len);
12008         chk->send_size = len + old_len;
12009         chk->book_size = SCTP_SIZE32(chk->send_size);
12010         chk->book_size_scale = 0;
12011         SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size);
12012         return;
12013 }
12014
12015 static void
12016 sctp_add_an_in_stream(struct sctp_tmit_chunk *chk,
12017     uint32_t seq,
12018     uint16_t adding)
12019 {
12020         uint16_t len, old_len;
12021         struct sctp_chunkhdr *ch;
12022         struct sctp_stream_reset_add_strm *addstr;
12023
12024         ch = mtod(chk->data, struct sctp_chunkhdr *);
12025         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
12026
12027         /* get to new offset for the param. */
12028         addstr = (struct sctp_stream_reset_add_strm *)((caddr_t)ch + len);
12029         /* now how long will this param be? */
12030         len = sizeof(struct sctp_stream_reset_add_strm);
12031         /* Fill it out. */
12032         addstr->ph.param_type = htons(SCTP_STR_RESET_ADD_IN_STREAMS);
12033         addstr->ph.param_length = htons(len);
12034         addstr->request_seq = htonl(seq);
12035         addstr->number_of_streams = htons(adding);
12036         addstr->reserved = 0;
12037
12038         /* now fix the chunk length */
12039         ch->chunk_length = htons(len + old_len);
12040         chk->send_size = len + old_len;
12041         chk->book_size = SCTP_SIZE32(chk->send_size);
12042         chk->book_size_scale = 0;
12043         SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size);
12044         return;
12045 }
12046
12047 int
12048 sctp_send_stream_reset_out_if_possible(struct sctp_tcb *stcb, int so_locked)
12049 {
12050         struct sctp_association *asoc;
12051         struct sctp_tmit_chunk *chk;
12052         struct sctp_chunkhdr *ch;
12053         uint32_t seq;
12054
12055         asoc = &stcb->asoc;
12056         asoc->trigger_reset = 0;
12057         if (asoc->stream_reset_outstanding) {
12058                 return (EALREADY);
12059         }
12060         sctp_alloc_a_chunk(stcb, chk);
12061         if (chk == NULL) {
12062                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12063                 return (ENOMEM);
12064         }
12065         chk->copy_by_ref = 0;
12066         chk->rec.chunk_id.id = SCTP_STREAM_RESET;
12067         chk->rec.chunk_id.can_take_data = 0;
12068         chk->flags = 0;
12069         chk->asoc = &stcb->asoc;
12070         chk->book_size = sizeof(struct sctp_chunkhdr);
12071         chk->send_size = SCTP_SIZE32(chk->book_size);
12072         chk->book_size_scale = 0;
12073         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
12074         if (chk->data == NULL) {
12075                 sctp_free_a_chunk(stcb, chk, so_locked);
12076                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12077                 return (ENOMEM);
12078         }
12079         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
12080
12081         /* setup chunk parameters */
12082         chk->sent = SCTP_DATAGRAM_UNSENT;
12083         chk->snd_count = 0;
12084         if (stcb->asoc.alternate) {
12085                 chk->whoTo = stcb->asoc.alternate;
12086         } else {
12087                 chk->whoTo = stcb->asoc.primary_destination;
12088         }
12089         ch = mtod(chk->data, struct sctp_chunkhdr *);
12090         ch->chunk_type = SCTP_STREAM_RESET;
12091         ch->chunk_flags = 0;
12092         ch->chunk_length = htons(chk->book_size);
12093         atomic_add_int(&chk->whoTo->ref_count, 1);
12094         SCTP_BUF_LEN(chk->data) = chk->send_size;
12095         seq = stcb->asoc.str_reset_seq_out;
12096         if (sctp_add_stream_reset_out(stcb, chk, seq, (stcb->asoc.str_reset_seq_in - 1), (stcb->asoc.sending_seq - 1))) {
12097                 seq++;
12098                 asoc->stream_reset_outstanding++;
12099         } else {
12100                 m_freem(chk->data);
12101                 chk->data = NULL;
12102                 sctp_free_a_chunk(stcb, chk, so_locked);
12103                 return (ENOENT);
12104         }
12105         asoc->str_reset = chk;
12106         /* insert the chunk for sending */
12107         TAILQ_INSERT_TAIL(&asoc->control_send_queue,
12108             chk,
12109             sctp_next);
12110         asoc->ctrl_queue_cnt++;
12111
12112         if (stcb->asoc.send_sack) {
12113                 sctp_send_sack(stcb, so_locked);
12114         }
12115         sctp_timer_start(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb, chk->whoTo);
12116         return (0);
12117 }
12118
12119 int
12120 sctp_send_str_reset_req(struct sctp_tcb *stcb,
12121     uint16_t number_entries, uint16_t *list,
12122     uint8_t send_in_req,
12123     uint8_t send_tsn_req,
12124     uint8_t add_stream,
12125     uint16_t adding_o,
12126     uint16_t adding_i, uint8_t peer_asked)
12127 {
12128         struct sctp_association *asoc;
12129         struct sctp_tmit_chunk *chk;
12130         struct sctp_chunkhdr *ch;
12131         int can_send_out_req = 0;
12132         uint32_t seq;
12133
12134         SCTP_TCB_LOCK_ASSERT(stcb);
12135
12136         asoc = &stcb->asoc;
12137         if (asoc->stream_reset_outstanding) {
12138                 /*-
12139                  * Already one pending, must get ACK back to clear the flag.
12140                  */
12141                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EBUSY);
12142                 return (EBUSY);
12143         }
12144         if ((send_in_req == 0) && (send_tsn_req == 0) &&
12145             (add_stream == 0)) {
12146                 /* nothing to do */
12147                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12148                 return (EINVAL);
12149         }
12150         if (send_tsn_req && send_in_req) {
12151                 /* error, can't do that */
12152                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12153                 return (EINVAL);
12154         } else if (send_in_req) {
12155                 can_send_out_req = 1;
12156         }
12157         if (number_entries > (MCLBYTES -
12158             SCTP_MIN_OVERHEAD -
12159             sizeof(struct sctp_chunkhdr) -
12160             sizeof(struct sctp_stream_reset_out_request)) /
12161             sizeof(uint16_t)) {
12162                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12163                 return (ENOMEM);
12164         }
12165         sctp_alloc_a_chunk(stcb, chk);
12166         if (chk == NULL) {
12167                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12168                 return (ENOMEM);
12169         }
12170         chk->copy_by_ref = 0;
12171         chk->rec.chunk_id.id = SCTP_STREAM_RESET;
12172         chk->rec.chunk_id.can_take_data = 0;
12173         chk->flags = 0;
12174         chk->asoc = &stcb->asoc;
12175         chk->book_size = sizeof(struct sctp_chunkhdr);
12176         chk->send_size = SCTP_SIZE32(chk->book_size);
12177         chk->book_size_scale = 0;
12178         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
12179         if (chk->data == NULL) {
12180                 sctp_free_a_chunk(stcb, chk, SCTP_SO_LOCKED);
12181                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12182                 return (ENOMEM);
12183         }
12184         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
12185
12186         /* setup chunk parameters */
12187         chk->sent = SCTP_DATAGRAM_UNSENT;
12188         chk->snd_count = 0;
12189         if (stcb->asoc.alternate) {
12190                 chk->whoTo = stcb->asoc.alternate;
12191         } else {
12192                 chk->whoTo = stcb->asoc.primary_destination;
12193         }
12194         atomic_add_int(&chk->whoTo->ref_count, 1);
12195         ch = mtod(chk->data, struct sctp_chunkhdr *);
12196         ch->chunk_type = SCTP_STREAM_RESET;
12197         ch->chunk_flags = 0;
12198         ch->chunk_length = htons(chk->book_size);
12199         SCTP_BUF_LEN(chk->data) = chk->send_size;
12200
12201         seq = stcb->asoc.str_reset_seq_out;
12202         if (can_send_out_req) {
12203                 int ret;
12204
12205                 ret = sctp_add_stream_reset_out(stcb, chk, seq, (stcb->asoc.str_reset_seq_in - 1), (stcb->asoc.sending_seq - 1));
12206                 if (ret) {
12207                         seq++;
12208                         asoc->stream_reset_outstanding++;
12209                 }
12210         }
12211         if ((add_stream & 1) &&
12212             ((stcb->asoc.strm_realoutsize - stcb->asoc.streamoutcnt) < adding_o)) {
12213                 /* Need to allocate more */
12214                 struct sctp_stream_out *oldstream;
12215                 struct sctp_stream_queue_pending *sp, *nsp;
12216                 int i;
12217 #if defined(SCTP_DETAILED_STR_STATS)
12218                 int j;
12219 #endif
12220
12221                 oldstream = stcb->asoc.strmout;
12222                 /* get some more */
12223                 SCTP_MALLOC(stcb->asoc.strmout, struct sctp_stream_out *,
12224                     (stcb->asoc.streamoutcnt + adding_o) * sizeof(struct sctp_stream_out),
12225                     SCTP_M_STRMO);
12226                 if (stcb->asoc.strmout == NULL) {
12227                         uint8_t x;
12228
12229                         stcb->asoc.strmout = oldstream;
12230                         /* Turn off the bit */
12231                         x = add_stream & 0xfe;
12232                         add_stream = x;
12233                         goto skip_stuff;
12234                 }
12235                 /*
12236                  * Ok now we proceed with copying the old out stuff and
12237                  * initializing the new stuff.
12238                  */
12239                 stcb->asoc.ss_functions.sctp_ss_clear(stcb, &stcb->asoc, false);
12240                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
12241                         TAILQ_INIT(&stcb->asoc.strmout[i].outqueue);
12242                         /* FIX ME FIX ME */
12243                         /*
12244                          * This should be a SS_COPY operation FIX ME STREAM
12245                          * SCHEDULER EXPERT
12246                          */
12247                         stcb->asoc.ss_functions.sctp_ss_init_stream(stcb, &stcb->asoc.strmout[i], &oldstream[i]);
12248                         stcb->asoc.strmout[i].chunks_on_queues = oldstream[i].chunks_on_queues;
12249 #if defined(SCTP_DETAILED_STR_STATS)
12250                         for (j = 0; j < SCTP_PR_SCTP_MAX + 1; j++) {
12251                                 stcb->asoc.strmout[i].abandoned_sent[j] = oldstream[i].abandoned_sent[j];
12252                                 stcb->asoc.strmout[i].abandoned_unsent[j] = oldstream[i].abandoned_unsent[j];
12253                         }
12254 #else
12255                         stcb->asoc.strmout[i].abandoned_sent[0] = oldstream[i].abandoned_sent[0];
12256                         stcb->asoc.strmout[i].abandoned_unsent[0] = oldstream[i].abandoned_unsent[0];
12257 #endif
12258                         stcb->asoc.strmout[i].next_mid_ordered = oldstream[i].next_mid_ordered;
12259                         stcb->asoc.strmout[i].next_mid_unordered = oldstream[i].next_mid_unordered;
12260                         stcb->asoc.strmout[i].last_msg_incomplete = oldstream[i].last_msg_incomplete;
12261                         stcb->asoc.strmout[i].sid = i;
12262                         stcb->asoc.strmout[i].state = oldstream[i].state;
12263                         /* now anything on those queues? */
12264                         TAILQ_FOREACH_SAFE(sp, &oldstream[i].outqueue, next, nsp) {
12265                                 TAILQ_REMOVE(&oldstream[i].outqueue, sp, next);
12266                                 TAILQ_INSERT_TAIL(&stcb->asoc.strmout[i].outqueue, sp, next);
12267                         }
12268                 }
12269                 /* now the new streams */
12270                 stcb->asoc.ss_functions.sctp_ss_init(stcb, &stcb->asoc);
12271                 for (i = stcb->asoc.streamoutcnt; i < (stcb->asoc.streamoutcnt + adding_o); i++) {
12272                         TAILQ_INIT(&stcb->asoc.strmout[i].outqueue);
12273                         stcb->asoc.strmout[i].chunks_on_queues = 0;
12274 #if defined(SCTP_DETAILED_STR_STATS)
12275                         for (j = 0; j < SCTP_PR_SCTP_MAX + 1; j++) {
12276                                 stcb->asoc.strmout[i].abandoned_sent[j] = 0;
12277                                 stcb->asoc.strmout[i].abandoned_unsent[j] = 0;
12278                         }
12279 #else
12280                         stcb->asoc.strmout[i].abandoned_sent[0] = 0;
12281                         stcb->asoc.strmout[i].abandoned_unsent[0] = 0;
12282 #endif
12283                         stcb->asoc.strmout[i].next_mid_ordered = 0;
12284                         stcb->asoc.strmout[i].next_mid_unordered = 0;
12285                         stcb->asoc.strmout[i].sid = i;
12286                         stcb->asoc.strmout[i].last_msg_incomplete = 0;
12287                         stcb->asoc.ss_functions.sctp_ss_init_stream(stcb, &stcb->asoc.strmout[i], NULL);
12288                         stcb->asoc.strmout[i].state = SCTP_STREAM_CLOSED;
12289                 }
12290                 stcb->asoc.strm_realoutsize = stcb->asoc.streamoutcnt + adding_o;
12291                 SCTP_FREE(oldstream, SCTP_M_STRMO);
12292         }
12293 skip_stuff:
12294         if ((add_stream & 1) && (adding_o > 0)) {
12295                 asoc->strm_pending_add_size = adding_o;
12296                 asoc->peer_req_out = peer_asked;
12297                 sctp_add_an_out_stream(chk, seq, adding_o);
12298                 seq++;
12299                 asoc->stream_reset_outstanding++;
12300         }
12301         if ((add_stream & 2) && (adding_i > 0)) {
12302                 sctp_add_an_in_stream(chk, seq, adding_i);
12303                 seq++;
12304                 asoc->stream_reset_outstanding++;
12305         }
12306         if (send_in_req) {
12307                 sctp_add_stream_reset_in(chk, number_entries, list, seq);
12308                 seq++;
12309                 asoc->stream_reset_outstanding++;
12310         }
12311         if (send_tsn_req) {
12312                 sctp_add_stream_reset_tsn(chk, seq);
12313                 asoc->stream_reset_outstanding++;
12314         }
12315         asoc->str_reset = chk;
12316         /* insert the chunk for sending */
12317         TAILQ_INSERT_TAIL(&asoc->control_send_queue,
12318             chk,
12319             sctp_next);
12320         asoc->ctrl_queue_cnt++;
12321         if (stcb->asoc.send_sack) {
12322                 sctp_send_sack(stcb, SCTP_SO_LOCKED);
12323         }
12324         sctp_timer_start(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb, chk->whoTo);
12325         return (0);
12326 }
12327
12328 void
12329 sctp_send_abort(struct mbuf *m, int iphlen, struct sockaddr *src, struct sockaddr *dst,
12330     struct sctphdr *sh, uint32_t vtag, struct mbuf *cause,
12331     uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum,
12332     uint32_t vrf_id, uint16_t port)
12333 {
12334         /* Don't respond to an ABORT with an ABORT. */
12335         if (sctp_is_there_an_abort_here(m, iphlen, &vtag)) {
12336                 if (cause)
12337                         sctp_m_freem(cause);
12338                 return;
12339         }
12340         sctp_send_resp_msg(src, dst, sh, vtag, SCTP_ABORT_ASSOCIATION, cause,
12341             mflowtype, mflowid, fibnum,
12342             vrf_id, port);
12343         return;
12344 }
12345
12346 void
12347 sctp_send_operr_to(struct sockaddr *src, struct sockaddr *dst,
12348     struct sctphdr *sh, uint32_t vtag, struct mbuf *cause,
12349     uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum,
12350     uint32_t vrf_id, uint16_t port)
12351 {
12352         sctp_send_resp_msg(src, dst, sh, vtag, SCTP_OPERATION_ERROR, cause,
12353             mflowtype, mflowid, fibnum,
12354             vrf_id, port);
12355         return;
12356 }
12357
12358 static struct mbuf *
12359 sctp_copy_resume(struct uio *uio,
12360     int max_send_len,
12361     int user_marks_eor,
12362     int *error,
12363     uint32_t *sndout,
12364     struct mbuf **new_tail)
12365 {
12366         struct mbuf *m;
12367
12368         m = m_uiotombuf(uio, M_WAITOK, max_send_len, 0,
12369             (M_PKTHDR | (user_marks_eor ? M_EOR : 0)));
12370         if (m == NULL) {
12371                 /* The only possible error is EFAULT. */
12372                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EFAULT);
12373                 *error = EFAULT;
12374         } else {
12375                 *sndout = m_length(m, NULL);
12376                 *new_tail = m_last(m);
12377         }
12378         return (m);
12379 }
12380
12381 static int
12382 sctp_copy_one(struct sctp_stream_queue_pending *sp,
12383     struct uio *uio,
12384     int resv_upfront)
12385 {
12386         sp->data = m_uiotombuf(uio, M_WAITOK, sp->length, resv_upfront, 0);
12387         if (sp->data == NULL) {
12388                 /* The only possible error is EFAULT. */
12389                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EFAULT);
12390                 return (EFAULT);
12391         }
12392         sp->tail_mbuf = m_last(sp->data);
12393         return (0);
12394 }
12395
12396 static struct sctp_stream_queue_pending *
12397 sctp_copy_it_in(struct sctp_tcb *stcb,
12398     struct sctp_association *asoc,
12399     struct sctp_nonpad_sndrcvinfo *srcv,
12400     struct uio *uio,
12401     struct sctp_nets *net,
12402     ssize_t max_send_len,
12403     int user_marks_eor,
12404     int *error)
12405 {
12406
12407         /*-
12408          * This routine must be very careful in its work. Protocol
12409          * processing is up and running so care must be taken to spl...()
12410          * when you need to do something that may effect the stcb/asoc. The
12411          * sb is locked however. When data is copied the protocol processing
12412          * should be enabled since this is a slower operation...
12413          */
12414         struct sctp_stream_queue_pending *sp;
12415         int resv_in_first;
12416
12417         *error = 0;
12418         sctp_alloc_a_strmoq(stcb, sp);
12419         if (sp == NULL) {
12420                 SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12421                 *error = ENOMEM;
12422                 goto out_now;
12423         }
12424         sp->act_flags = 0;
12425         sp->sender_all_done = 0;
12426         sp->sinfo_flags = srcv->sinfo_flags;
12427         sp->timetolive = srcv->sinfo_timetolive;
12428         sp->ppid = srcv->sinfo_ppid;
12429         sp->context = srcv->sinfo_context;
12430         sp->fsn = 0;
12431         (void)SCTP_GETTIME_TIMEVAL(&sp->ts);
12432         sp->sid = srcv->sinfo_stream;
12433         sp->length = (uint32_t)min(uio->uio_resid, max_send_len);
12434         if ((sp->length == (uint32_t)uio->uio_resid) &&
12435             ((user_marks_eor == 0) ||
12436             (srcv->sinfo_flags & SCTP_EOF) ||
12437             (user_marks_eor && (srcv->sinfo_flags & SCTP_EOR)))) {
12438                 sp->msg_is_complete = 1;
12439         } else {
12440                 sp->msg_is_complete = 0;
12441         }
12442         sp->sender_all_done = 0;
12443         sp->some_taken = 0;
12444         sp->put_last_out = 0;
12445         resv_in_first = SCTP_DATA_CHUNK_OVERHEAD(stcb);
12446         sp->data = sp->tail_mbuf = NULL;
12447         if (sp->length == 0) {
12448                 goto skip_copy;
12449         }
12450         if (srcv->sinfo_keynumber_valid) {
12451                 sp->auth_keyid = srcv->sinfo_keynumber;
12452         } else {
12453                 sp->auth_keyid = stcb->asoc.authinfo.active_keyid;
12454         }
12455         if (sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks)) {
12456                 sctp_auth_key_acquire(stcb, sp->auth_keyid);
12457                 sp->holds_key_ref = 1;
12458         }
12459         *error = sctp_copy_one(sp, uio, resv_in_first);
12460 skip_copy:
12461         if (*error) {
12462                 sctp_free_a_strmoq(stcb, sp, SCTP_SO_LOCKED);
12463                 sp = NULL;
12464         } else {
12465                 if (sp->sinfo_flags & SCTP_ADDR_OVER) {
12466                         sp->net = net;
12467                         atomic_add_int(&sp->net->ref_count, 1);
12468                 } else {
12469                         sp->net = NULL;
12470                 }
12471                 sctp_set_prsctp_policy(sp);
12472         }
12473 out_now:
12474         return (sp);
12475 }
12476
12477 int
12478 sctp_sosend(struct socket *so,
12479     struct sockaddr *addr,
12480     struct uio *uio,
12481     struct mbuf *top,
12482     struct mbuf *control,
12483     int flags,
12484     struct thread *p)
12485 {
12486         struct sctp_sndrcvinfo sndrcvninfo;
12487 #if defined(INET) && defined(INET6)
12488         struct sockaddr_in sin;
12489 #endif
12490         struct sockaddr *addr_to_use;
12491         int error;
12492         bool use_sndinfo;
12493
12494         if (control != NULL) {
12495                 /* process cmsg snd/rcv info (maybe a assoc-id) */
12496                 use_sndinfo = sctp_find_cmsg(SCTP_SNDRCV, (void *)&sndrcvninfo, control, sizeof(sndrcvninfo));
12497         } else {
12498                 use_sndinfo = false;
12499         }
12500 #if defined(INET) && defined(INET6)
12501         if ((addr != NULL) && (addr->sa_family == AF_INET6)) {
12502                 struct sockaddr_in6 *sin6;
12503
12504                 if (addr->sa_len != sizeof(struct sockaddr_in6)) {
12505                         SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12506                         return (EINVAL);
12507                 }
12508                 sin6 = (struct sockaddr_in6 *)addr;
12509                 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
12510                         in6_sin6_2_sin(&sin, sin6);
12511                         addr_to_use = (struct sockaddr *)&sin;
12512                 } else {
12513                         addr_to_use = addr;
12514                 }
12515         } else {
12516                 addr_to_use = addr;
12517         }
12518 #else
12519         addr_to_use = addr;
12520 #endif
12521         error = sctp_lower_sosend(so, addr_to_use, uio, top, control, flags,
12522             use_sndinfo ? &sndrcvninfo : NULL, p);
12523         return (error);
12524 }
12525
12526 int
12527 sctp_lower_sosend(struct socket *so,
12528     struct sockaddr *addr,
12529     struct uio *uio,
12530     struct mbuf *top,
12531     struct mbuf *control,
12532     int flags,
12533     struct sctp_sndrcvinfo *srcv,
12534     struct thread *p)
12535 {
12536         struct sctp_nonpad_sndrcvinfo sndrcvninfo_buf;
12537         struct epoch_tracker et;
12538         struct timeval now;
12539         struct sctp_block_entry be;
12540         struct sctp_inpcb *inp;
12541         struct sctp_tcb *stcb = NULL;
12542         struct sctp_nets *net;
12543         struct sctp_association *asoc;
12544         struct sctp_inpcb *t_inp;
12545         struct sctp_nonpad_sndrcvinfo *sndrcvninfo;
12546         ssize_t sndlen = 0, max_len, local_add_more;
12547         ssize_t local_soresv = 0;
12548         sctp_assoc_t sinfo_assoc_id;
12549         int user_marks_eor;
12550         int nagle_applies = 0;
12551         int error;
12552         int queue_only = 0, queue_only_for_init = 0;
12553         int un_sent;
12554         int now_filled = 0;
12555         unsigned int inqueue_bytes = 0;
12556         uint16_t port;
12557         uint16_t sinfo_flags;
12558         uint16_t sinfo_stream;
12559         bool create_lock_applied = false;
12560         bool free_cnt_applied = false;
12561         bool some_on_control;
12562         bool got_all_of_the_send = false;
12563         bool non_blocking = false;
12564
12565         error = 0;
12566         net = NULL;
12567         stcb = NULL;
12568
12569         if ((uio == NULL) && (top == NULL)) {
12570                 error = EINVAL;
12571                 goto out_unlocked;
12572         }
12573         if (addr != NULL) {
12574                 union sctp_sockstore *raddr = (union sctp_sockstore *)addr;
12575
12576                 switch (raddr->sa.sa_family) {
12577 #ifdef INET
12578                 case AF_INET:
12579                         if (raddr->sin.sin_len != sizeof(struct sockaddr_in)) {
12580                                 error = EINVAL;
12581                                 goto out_unlocked;
12582                         }
12583                         port = raddr->sin.sin_port;
12584                         break;
12585 #endif
12586 #ifdef INET6
12587                 case AF_INET6:
12588                         if (raddr->sin6.sin6_len != sizeof(struct sockaddr_in6)) {
12589                                 error = EINVAL;
12590                                 goto out_unlocked;
12591                         }
12592                         port = raddr->sin6.sin6_port;
12593                         break;
12594 #endif
12595                 default:
12596                         error = EAFNOSUPPORT;
12597                         goto out_unlocked;
12598                 }
12599         } else {
12600                 port = 0;
12601         }
12602         if (uio != NULL) {
12603                 if (uio->uio_resid < 0) {
12604                         error = EINVAL;
12605                         goto out_unlocked;
12606                 }
12607                 sndlen = uio->uio_resid;
12608         } else {
12609                 sndlen = SCTP_HEADER_LEN(top);
12610         }
12611         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Send called addr:%p send length %zd\n",
12612             (void *)addr, sndlen);
12613
12614         t_inp = inp = (struct sctp_inpcb *)so->so_pcb;
12615         if (inp == NULL) {
12616                 error = EINVAL;
12617                 goto out_unlocked;
12618         }
12619         user_marks_eor = sctp_is_feature_on(inp, SCTP_PCB_FLAGS_EXPLICIT_EOR);
12620         if ((uio == NULL) && (user_marks_eor != 0)) {
12621                 /*-
12622                  * We do not support eeor mode for
12623                  * sending with mbuf chains (like sendfile).
12624                  */
12625                 error = EINVAL;
12626                 goto out_unlocked;
12627         }
12628         if ((inp->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) &&
12629             SCTP_IS_LISTENING(inp)) {
12630                 /* The listener can NOT send. */
12631                 error = EINVAL;
12632                 goto out_unlocked;
12633         }
12634         atomic_add_int(&inp->total_sends, 1);
12635
12636         if (srcv != NULL) {
12637                 sndrcvninfo = (struct sctp_nonpad_sndrcvinfo *)srcv;
12638                 sinfo_assoc_id = sndrcvninfo->sinfo_assoc_id;
12639                 sinfo_flags = sndrcvninfo->sinfo_flags;
12640                 if (INVALID_SINFO_FLAG(sinfo_flags) ||
12641                     PR_SCTP_INVALID_POLICY(sinfo_flags)) {
12642                         error = EINVAL;
12643                         goto out_unlocked;
12644                 }
12645                 if (sinfo_flags != 0) {
12646                         SCTP_STAT_INCR(sctps_sends_with_flags);
12647                 }
12648         } else {
12649                 sndrcvninfo = NULL;
12650                 sinfo_flags = inp->def_send.sinfo_flags;
12651                 sinfo_assoc_id = inp->def_send.sinfo_assoc_id;
12652         }
12653         if (flags & MSG_EOR) {
12654                 sinfo_flags |= SCTP_EOR;
12655         }
12656         if (flags & MSG_EOF) {
12657                 sinfo_flags |= SCTP_EOF;
12658         }
12659         if ((sinfo_flags & SCTP_ADDR_OVER) && (addr == NULL)) {
12660                 error = EINVAL;
12661                 goto out_unlocked;
12662         }
12663         SCTP_INP_RLOCK(inp);
12664         if ((sinfo_flags & SCTP_SENDALL) &&
12665             (inp->sctp_flags & SCTP_PCB_FLAGS_UDPTYPE)) {
12666                 SCTP_INP_RUNLOCK(inp);
12667                 error = sctp_sendall(inp, uio, top, sndrcvninfo);
12668                 top = NULL;
12669                 goto out_unlocked;
12670         }
12671         /* Now we must find the association. */
12672         if ((inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) ||
12673             (inp->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) {
12674                 stcb = LIST_FIRST(&inp->sctp_asoc_list);
12675                 if (stcb != NULL) {
12676                         SCTP_TCB_LOCK(stcb);
12677                 }
12678                 SCTP_INP_RUNLOCK(inp);
12679         } else if (sinfo_assoc_id > SCTP_ALL_ASSOC) {
12680                 stcb = sctp_findasoc_ep_asocid_locked(inp, sinfo_assoc_id, 1);
12681                 SCTP_INP_RUNLOCK(inp);
12682                 if (stcb != NULL) {
12683                         SCTP_TCB_LOCK_ASSERT(stcb);
12684                 }
12685         } else if (addr != NULL) {
12686                 /*-
12687                  * Since we did not use findep we must
12688                  * increment it, and if we don't find a tcb
12689                  * decrement it.
12690                  */
12691                 SCTP_INP_INCR_REF(inp);
12692                 SCTP_INP_RUNLOCK(inp);
12693                 stcb = sctp_findassociation_ep_addr(&t_inp, addr, &net, NULL, NULL);
12694                 if (stcb == NULL) {
12695                         SCTP_INP_WLOCK(inp);
12696                         SCTP_INP_DECR_REF(inp);
12697                         SCTP_INP_WUNLOCK(inp);
12698                 } else {
12699                         SCTP_TCB_LOCK_ASSERT(stcb);
12700                 }
12701         } else {
12702                 SCTP_INP_RUNLOCK(inp);
12703         }
12704
12705 #ifdef INVARIANTS
12706         if (stcb != NULL) {
12707                 SCTP_TCB_LOCK_ASSERT(stcb);
12708         }
12709 #endif
12710
12711         if ((stcb == NULL) && (addr != NULL)) {
12712                 /* Possible implicit send? */
12713                 SCTP_ASOC_CREATE_LOCK(inp);
12714                 create_lock_applied = true;
12715                 if ((inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) ||
12716                     (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE)) {
12717                         error = EINVAL;
12718                         goto out_unlocked;
12719                 }
12720                 if (((inp->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) == 0) &&
12721                     (addr->sa_family == AF_INET6)) {
12722                         error = EINVAL;
12723                         goto out_unlocked;
12724                 }
12725                 SCTP_INP_WLOCK(inp);
12726                 SCTP_INP_INCR_REF(inp);
12727                 SCTP_INP_WUNLOCK(inp);
12728                 /* With the lock applied look again */
12729                 stcb = sctp_findassociation_ep_addr(&t_inp, addr, &net, NULL, NULL);
12730 #if defined(INET) || defined(INET6)
12731                 if ((stcb == NULL) && (control != NULL) && (port > 0)) {
12732                         stcb = sctp_findassociation_cmsgs(&t_inp, port, control, &net, &error);
12733                 }
12734 #endif
12735                 if (stcb == NULL) {
12736                         SCTP_INP_WLOCK(inp);
12737                         SCTP_INP_DECR_REF(inp);
12738                         SCTP_INP_WUNLOCK(inp);
12739                 } else {
12740                         SCTP_TCB_LOCK_ASSERT(stcb);
12741                         SCTP_ASOC_CREATE_UNLOCK(inp);
12742                         create_lock_applied = false;
12743                 }
12744                 if (error != 0) {
12745                         goto out_unlocked;
12746                 }
12747                 if (t_inp != inp) {
12748                         error = ENOTCONN;
12749                         goto out_unlocked;
12750                 }
12751         }
12752         if (stcb == NULL) {
12753                 if (addr == NULL) {
12754                         error = ENOENT;
12755                         goto out_unlocked;
12756                 } else {
12757                         /* We must go ahead and start the INIT process */
12758                         uint32_t vrf_id;
12759
12760                         if ((sinfo_flags & SCTP_ABORT) ||
12761                             ((sinfo_flags & SCTP_EOF) && (sndlen == 0))) {
12762                                 /*-
12763                                  * User asks to abort a non-existent assoc,
12764                                  * or EOF a non-existent assoc with no data
12765                                  */
12766                                 error = ENOENT;
12767                                 goto out_unlocked;
12768                         }
12769                         /* get an asoc/stcb struct */
12770                         vrf_id = inp->def_vrf_id;
12771                         KASSERT(create_lock_applied, ("create_lock_applied is false"));
12772                         stcb = sctp_aloc_assoc_connected(inp, addr, &error, 0, 0, vrf_id,
12773                             inp->sctp_ep.pre_open_stream_count,
12774                             inp->sctp_ep.port,
12775                             p,
12776                             SCTP_INITIALIZE_AUTH_PARAMS);
12777                         if (stcb == NULL) {
12778                                 /* error is setup for us in the call. */
12779                                 KASSERT(error != 0, ("error is 0 although stcb is NULL"));
12780                                 goto out_unlocked;
12781                         }
12782                         SCTP_TCB_LOCK_ASSERT(stcb);
12783                         SCTP_ASOC_CREATE_UNLOCK(inp);
12784                         create_lock_applied = false;
12785                         /*
12786                          * Turn on queue only flag to prevent data from
12787                          * being sent
12788                          */
12789                         queue_only = 1;
12790                         SCTP_SET_STATE(stcb, SCTP_STATE_COOKIE_WAIT);
12791                         (void)SCTP_GETTIME_TIMEVAL(&stcb->asoc.time_entered);
12792                         if (control != NULL) {
12793                                 if (sctp_process_cmsgs_for_init(stcb, control, &error)) {
12794                                         sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
12795                                             SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_6);
12796                                         stcb = NULL;
12797                                         KASSERT(error != 0,
12798                                             ("error is 0 although sctp_process_cmsgs_for_init() indicated an error"));
12799                                         goto out_unlocked;
12800                                 }
12801                         }
12802                         /* out with the INIT */
12803                         queue_only_for_init = 1;
12804                         /*-
12805                          * we may want to dig in after this call and adjust the MTU
12806                          * value. It defaulted to 1500 (constant) but the ro
12807                          * structure may now have an update and thus we may need to
12808                          * change it BEFORE we append the message.
12809                          */
12810                 }
12811         }
12812
12813         KASSERT(!create_lock_applied, ("create_lock_applied is true"));
12814         KASSERT(stcb != NULL, ("stcb is NULL"));
12815         SCTP_TCB_LOCK_ASSERT(stcb);
12816
12817         asoc = &stcb->asoc;
12818         if ((asoc->state & SCTP_STATE_ABOUT_TO_BE_FREED) ||
12819             (asoc->state & SCTP_STATE_WAS_ABORTED)) {
12820                 if (asoc->state & SCTP_STATE_WAS_ABORTED) {
12821                         /* XXX: Could also be ECONNABORTED, not enough info. */
12822                         error = ECONNRESET;
12823                 } else {
12824                         error = ENOTCONN;
12825                 }
12826                 goto out_unlocked;
12827         }
12828         if ((SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_WAIT) ||
12829             (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)) {
12830                 queue_only = 1;
12831         }
12832         /* Keep the stcb from being freed under our feet. */
12833         atomic_add_int(&asoc->refcnt, 1);
12834         free_cnt_applied = true;
12835         if (sndrcvninfo == NULL) {
12836                 /* Use a local copy to have a consistent view. */
12837                 sndrcvninfo_buf = asoc->def_send;
12838                 sndrcvninfo = &sndrcvninfo_buf;
12839                 sinfo_flags = sndrcvninfo->sinfo_flags;
12840                 if (flags & MSG_EOR) {
12841                         sinfo_flags |= SCTP_EOR;
12842                 }
12843                 if (flags & MSG_EOF) {
12844                         sinfo_flags |= SCTP_EOF;
12845                 }
12846         }
12847         /* Are we aborting? */
12848         if (sinfo_flags & SCTP_ABORT) {
12849                 struct mbuf *mm;
12850                 struct sctp_paramhdr *ph;
12851                 ssize_t tot_demand, tot_out = 0, max_out;
12852
12853                 SCTP_STAT_INCR(sctps_sends_with_abort);
12854                 if ((SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_WAIT) ||
12855                     (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)) {
12856                         /* It has to be up before we abort. */
12857                         error = EINVAL;
12858                         goto out_unlocked;
12859                 }
12860                 /* How big is the user initiated abort? */
12861                 if (top != NULL) {
12862                         struct mbuf *cntm;
12863
12864                         if (sndlen != 0) {
12865                                 for (cntm = top; cntm; cntm = SCTP_BUF_NEXT(cntm)) {
12866                                         tot_out += SCTP_BUF_LEN(cntm);
12867                                 }
12868                         }
12869                         mm = sctp_get_mbuf_for_msg(sizeof(struct sctp_paramhdr), 0, M_NOWAIT, 1, MT_DATA);
12870                 } else {
12871                         /* Must fit in a MTU */
12872                         tot_out = sndlen;
12873                         tot_demand = (tot_out + sizeof(struct sctp_paramhdr));
12874                         if (tot_demand > SCTP_DEFAULT_ADD_MORE) {
12875                                 error = EMSGSIZE;
12876                                 goto out_unlocked;
12877                         }
12878                         mm = sctp_get_mbuf_for_msg((unsigned int)tot_demand, 0, M_NOWAIT, 1, MT_DATA);
12879                 }
12880                 if (mm == NULL) {
12881                         error = ENOMEM;
12882                         goto out_unlocked;
12883                 }
12884                 max_out = asoc->smallest_mtu - sizeof(struct sctp_paramhdr);
12885                 max_out -= sizeof(struct sctp_abort_msg);
12886                 if (tot_out > max_out) {
12887                         tot_out = max_out;
12888                 }
12889                 ph = mtod(mm, struct sctp_paramhdr *);
12890                 ph->param_type = htons(SCTP_CAUSE_USER_INITIATED_ABT);
12891                 ph->param_length = htons((uint16_t)(sizeof(struct sctp_paramhdr) + tot_out));
12892                 ph++;
12893                 SCTP_BUF_LEN(mm) = (int)(tot_out + sizeof(struct sctp_paramhdr));
12894                 if (top == NULL) {
12895                         SCTP_TCB_UNLOCK(stcb);
12896                         error = uiomove((caddr_t)ph, (int)tot_out, uio);
12897                         SCTP_TCB_LOCK(stcb);
12898                         if ((asoc->state & SCTP_STATE_ABOUT_TO_BE_FREED) ||
12899                             (asoc->state & SCTP_STATE_WAS_ABORTED)) {
12900                                 sctp_m_freem(mm);
12901                                 if (asoc->state & SCTP_STATE_WAS_ABORTED) {
12902                                         /*
12903                                          * XXX: Could also be ECONNABORTED,
12904                                          * not enough info.
12905                                          */
12906                                         error = ECONNRESET;
12907                                 } else {
12908                                         error = ENOTCONN;
12909                                 }
12910                                 goto out_unlocked;
12911                         }
12912                         if (error != 0) {
12913                                 /*-
12914                                  * Here if we can't get his data we
12915                                  * still abort we just don't get to
12916                                  * send the users note :-0
12917                                  */
12918                                 sctp_m_freem(mm);
12919                                 mm = NULL;
12920                                 error = 0;
12921                         }
12922                 } else {
12923                         if (sndlen != 0) {
12924                                 SCTP_BUF_NEXT(mm) = top;
12925                         }
12926                 }
12927                 atomic_subtract_int(&asoc->refcnt, 1);
12928                 free_cnt_applied = false;
12929                 /* release this lock, otherwise we hang on ourselves */
12930                 NET_EPOCH_ENTER(et);
12931                 sctp_abort_an_association(stcb->sctp_ep, stcb, mm, false, SCTP_SO_LOCKED);
12932                 NET_EPOCH_EXIT(et);
12933                 stcb = NULL;
12934                 /*
12935                  * In this case top is already chained to mm avoid double
12936                  * free, since we free it below if top != NULL and driver
12937                  * would free it after sending the packet out
12938                  */
12939                 if (sndlen != 0) {
12940                         top = NULL;
12941                 }
12942                 goto out_unlocked;
12943         }
12944
12945         KASSERT(stcb != NULL, ("stcb is NULL"));
12946         SCTP_TCB_LOCK_ASSERT(stcb);
12947         KASSERT((asoc->state & SCTP_STATE_ABOUT_TO_BE_FREED) == 0,
12948             ("Association about to be freed"));
12949         KASSERT((asoc->state & SCTP_STATE_WAS_ABORTED) == 0,
12950             ("Association was aborted"));
12951
12952         if (sinfo_flags & SCTP_ADDR_OVER) {
12953                 if (addr != NULL) {
12954                         net = sctp_findnet(stcb, addr);
12955                 } else {
12956                         net = NULL;
12957                 }
12958                 if ((net == NULL) ||
12959                     ((port != 0) && (port != stcb->rport))) {
12960                         error = EINVAL;
12961                         goto out_unlocked;
12962                 }
12963         } else {
12964                 if (asoc->alternate != NULL) {
12965                         net = asoc->alternate;
12966                 } else {
12967                         net = asoc->primary_destination;
12968                 }
12969         }
12970         if (sndlen == 0) {
12971                 if (sinfo_flags & SCTP_EOF) {
12972                         got_all_of_the_send = true;
12973                         goto dataless_eof;
12974                 } else {
12975                         error = EINVAL;
12976                         goto out_unlocked;
12977                 }
12978         }
12979         if (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_NO_FRAGMENT)) {
12980                 if (sndlen > (ssize_t)asoc->smallest_mtu) {
12981                         error = EMSGSIZE;
12982                         goto out_unlocked;
12983                 }
12984         }
12985         sinfo_stream = sndrcvninfo->sinfo_stream;
12986         /* Is the stream no. valid? */
12987         if (sinfo_stream >= asoc->streamoutcnt) {
12988                 /* Invalid stream number */
12989                 error = EINVAL;
12990                 goto out_unlocked;
12991         }
12992         if ((asoc->strmout[sinfo_stream].state != SCTP_STREAM_OPEN) &&
12993             (asoc->strmout[sinfo_stream].state != SCTP_STREAM_OPENING)) {
12994                 /*
12995                  * Can't queue any data while stream reset is underway.
12996                  */
12997                 if (asoc->strmout[sinfo_stream].state > SCTP_STREAM_OPEN) {
12998                         error = EAGAIN;
12999                 } else {
13000                         error = EINVAL;
13001                 }
13002                 goto out_unlocked;
13003         }
13004         atomic_add_int(&stcb->total_sends, 1);
13005         if (SCTP_SO_IS_NBIO(so) || (flags & (MSG_NBIO | MSG_DONTWAIT)) != 0) {
13006                 non_blocking = true;
13007         }
13008         if (non_blocking) {
13009                 ssize_t amount;
13010
13011                 inqueue_bytes = asoc->total_output_queue_size - (asoc->chunks_on_out_queue * SCTP_DATA_CHUNK_OVERHEAD(stcb));
13012                 if (user_marks_eor == 0) {
13013                         amount = sndlen;
13014                 } else {
13015                         amount = 1;
13016                 }
13017                 if ((SCTP_SB_LIMIT_SND(so) < (amount + inqueue_bytes + asoc->sb_send_resv)) ||
13018                     (asoc->chunks_on_out_queue >= SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue))) {
13019                         if ((sndlen > (ssize_t)SCTP_SB_LIMIT_SND(so)) &&
13020                             (user_marks_eor == 0)) {
13021                                 error = EMSGSIZE;
13022                         } else {
13023                                 error = EWOULDBLOCK;
13024                         }
13025                         goto out_unlocked;
13026                 }
13027         }
13028         atomic_add_int(&asoc->sb_send_resv, (int)sndlen);
13029         local_soresv = sndlen;
13030
13031         KASSERT(stcb != NULL, ("stcb is NULL"));
13032         SCTP_TCB_LOCK_ASSERT(stcb);
13033         KASSERT((asoc->state & SCTP_STATE_ABOUT_TO_BE_FREED) == 0,
13034             ("Association about to be freed"));
13035         KASSERT((asoc->state & SCTP_STATE_WAS_ABORTED) == 0,
13036             ("Association was aborted"));
13037
13038         /* Ok, we will attempt a msgsnd :> */
13039         if (p != NULL) {
13040                 p->td_ru.ru_msgsnd++;
13041         }
13042         /* Calculate the maximum we can send */
13043         inqueue_bytes = asoc->total_output_queue_size - (asoc->chunks_on_out_queue * SCTP_DATA_CHUNK_OVERHEAD(stcb));
13044         if (SCTP_SB_LIMIT_SND(so) > inqueue_bytes) {
13045                 max_len = SCTP_SB_LIMIT_SND(so) - inqueue_bytes;
13046         } else {
13047                 max_len = 0;
13048         }
13049         /* Unless E_EOR mode is on, we must make a send FIT in one call. */
13050         if ((user_marks_eor == 0) &&
13051             (sndlen > (ssize_t)SCTP_SB_LIMIT_SND(stcb->sctp_socket))) {
13052                 /* It will NEVER fit. */
13053                 error = EMSGSIZE;
13054                 goto out_unlocked;
13055         }
13056         if (user_marks_eor != 0) {
13057                 local_add_more = (ssize_t)min(SCTP_SB_LIMIT_SND(so), SCTP_BASE_SYSCTL(sctp_add_more_threshold));
13058         } else {
13059                 /*-
13060                  * For non-eeor the whole message must fit in
13061                  * the socket send buffer.
13062                  */
13063                 local_add_more = sndlen;
13064         }
13065         if (non_blocking) {
13066                 goto skip_preblock;
13067         }
13068         if (((max_len <= local_add_more) && ((ssize_t)SCTP_SB_LIMIT_SND(so) >= local_add_more)) ||
13069             (max_len == 0) ||
13070             ((asoc->chunks_on_out_queue + asoc->stream_queue_cnt) >= SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue))) {
13071                 /* No room right now! */
13072                 inqueue_bytes = asoc->total_output_queue_size - (asoc->chunks_on_out_queue * SCTP_DATA_CHUNK_OVERHEAD(stcb));
13073                 SOCKBUF_LOCK(&so->so_snd);
13074                 while ((SCTP_SB_LIMIT_SND(so) < (inqueue_bytes + local_add_more)) ||
13075                     ((asoc->stream_queue_cnt + asoc->chunks_on_out_queue) >= SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue))) {
13076                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "pre_block limit:%u <(inq:%d + %zd) || (%d+%d > %d)\n",
13077                             (unsigned int)SCTP_SB_LIMIT_SND(so),
13078                             inqueue_bytes,
13079                             local_add_more,
13080                             asoc->stream_queue_cnt,
13081                             asoc->chunks_on_out_queue,
13082                             SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue));
13083                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13084                                 sctp_log_block(SCTP_BLOCK_LOG_INTO_BLKA, asoc, sndlen);
13085                         }
13086                         be.error = 0;
13087                         stcb->block_entry = &be;
13088                         SCTP_TCB_UNLOCK(stcb);
13089                         error = sbwait(so, SO_SND);
13090                         if (error == 0) {
13091                                 if (so->so_error != 0) {
13092                                         error = so->so_error;
13093                                 }
13094                                 if (be.error != 0) {
13095                                         error = be.error;
13096                                 }
13097                         }
13098                         SOCKBUF_UNLOCK(&so->so_snd);
13099                         SCTP_TCB_LOCK(stcb);
13100                         stcb->block_entry = NULL;
13101                         if (error != 0) {
13102                                 goto out_unlocked;
13103                         }
13104                         if ((asoc->state & SCTP_STATE_ABOUT_TO_BE_FREED) ||
13105                             (asoc->state & SCTP_STATE_WAS_ABORTED)) {
13106                                 if (asoc->state & SCTP_STATE_WAS_ABORTED) {
13107                                         /*
13108                                          * XXX: Could also be ECONNABORTED,
13109                                          * not enough info.
13110                                          */
13111                                         error = ECONNRESET;
13112                                 } else {
13113                                         error = ENOTCONN;
13114                                 }
13115                                 goto out_unlocked;
13116                         }
13117                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13118                                 sctp_log_block(SCTP_BLOCK_LOG_OUTOF_BLK,
13119                                     asoc, asoc->total_output_queue_size);
13120                         }
13121                         inqueue_bytes = asoc->total_output_queue_size - (asoc->chunks_on_out_queue * SCTP_DATA_CHUNK_OVERHEAD(stcb));
13122                         SOCKBUF_LOCK(&so->so_snd);
13123                 }
13124                 if (SCTP_SB_LIMIT_SND(so) > inqueue_bytes) {
13125                         max_len = SCTP_SB_LIMIT_SND(so) - inqueue_bytes;
13126                 } else {
13127                         max_len = 0;
13128                 }
13129                 SOCKBUF_UNLOCK(&so->so_snd);
13130         }
13131
13132 skip_preblock:
13133         KASSERT(stcb != NULL, ("stcb is NULL"));
13134         SCTP_TCB_LOCK_ASSERT(stcb);
13135         KASSERT((asoc->state & SCTP_STATE_ABOUT_TO_BE_FREED) == 0,
13136             ("Association about to be freed"));
13137         KASSERT((asoc->state & SCTP_STATE_WAS_ABORTED) == 0,
13138             ("Association was aborted"));
13139
13140         /*
13141          * sndlen covers for mbuf case uio_resid covers for the non-mbuf
13142          * case NOTE: uio will be null when top/mbuf is passed
13143          */
13144         if (top == NULL) {
13145                 struct sctp_stream_queue_pending *sp;
13146                 struct sctp_stream_out *strm;
13147                 uint32_t sndout;
13148
13149                 if ((asoc->stream_locked) &&
13150                     (asoc->stream_locked_on != sinfo_stream)) {
13151                         error = EINVAL;
13152                         goto out;
13153                 }
13154                 strm = &asoc->strmout[sinfo_stream];
13155                 if (strm->last_msg_incomplete == 0) {
13156         do_a_copy_in:
13157                         SCTP_TCB_UNLOCK(stcb);
13158                         sp = sctp_copy_it_in(stcb, asoc, sndrcvninfo, uio, net, max_len, user_marks_eor, &error);
13159                         SCTP_TCB_LOCK(stcb);
13160                         if ((asoc->state & SCTP_STATE_ABOUT_TO_BE_FREED) ||
13161                             (asoc->state & SCTP_STATE_WAS_ABORTED)) {
13162                                 if (asoc->state & SCTP_STATE_WAS_ABORTED) {
13163                                         /*
13164                                          * XXX: Could also be ECONNABORTED,
13165                                          * not enough info.
13166                                          */
13167                                         error = ECONNRESET;
13168                                 } else {
13169                                         error = ENOTCONN;
13170                                 }
13171                                 goto out;
13172                         }
13173                         if (error != 0) {
13174                                 goto out;
13175                         }
13176                         /*
13177                          * Reject the sending of a new user message, if the
13178                          * association is about to be shut down.
13179                          */
13180                         if ((SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_SENT) ||
13181                             (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_RECEIVED) ||
13182                             (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_ACK_SENT) ||
13183                             (asoc->state & SCTP_STATE_SHUTDOWN_PENDING)) {
13184                                 if (sp->data != 0) {
13185                                         sctp_m_freem(sp->data);
13186                                         sp->data = NULL;
13187                                         sp->tail_mbuf = NULL;
13188                                         sp->length = 0;
13189                                 }
13190                                 if (sp->net != NULL) {
13191                                         sctp_free_remote_addr(sp->net);
13192                                         sp->net = NULL;
13193                                 }
13194                                 sctp_free_a_strmoq(stcb, sp, SCTP_SO_LOCKED);
13195                                 error = EPIPE;
13196                                 goto out_unlocked;
13197                         }
13198                         /* The out streams might be reallocated. */
13199                         strm = &asoc->strmout[sinfo_stream];
13200                         if (sp->msg_is_complete) {
13201                                 strm->last_msg_incomplete = 0;
13202                                 asoc->stream_locked = 0;
13203                         } else {
13204                                 /*
13205                                  * Just got locked to this guy in case of an
13206                                  * interrupt.
13207                                  */
13208                                 strm->last_msg_incomplete = 1;
13209                                 if (asoc->idata_supported == 0) {
13210                                         asoc->stream_locked = 1;
13211                                         asoc->stream_locked_on = sinfo_stream;
13212                                 }
13213                                 sp->sender_all_done = 0;
13214                         }
13215                         sctp_snd_sb_alloc(stcb, sp->length);
13216                         atomic_add_int(&asoc->stream_queue_cnt, 1);
13217                         if (sinfo_flags & SCTP_UNORDERED) {
13218                                 SCTP_STAT_INCR(sctps_sends_with_unord);
13219                         }
13220                         sp->processing = 1;
13221                         TAILQ_INSERT_TAIL(&strm->outqueue, sp, next);
13222                         asoc->ss_functions.sctp_ss_add_to_stream(stcb, asoc, strm, sp);
13223                 } else {
13224                         sp = TAILQ_LAST(&strm->outqueue, sctp_streamhead);
13225                         if (sp == NULL) {
13226                                 /* ???? Huh ??? last msg is gone */
13227 #ifdef INVARIANTS
13228                                 panic("Warning: Last msg marked incomplete, yet nothing left?");
13229 #else
13230                                 SCTP_PRINTF("Warning: Last msg marked incomplete, yet nothing left?\n");
13231                                 strm->last_msg_incomplete = 0;
13232 #endif
13233                                 goto do_a_copy_in;
13234                         }
13235                         if (sp->processing != 0) {
13236                                 error = EINVAL;
13237                                 goto out;
13238                         } else {
13239                                 sp->processing = 1;
13240                         }
13241                 }
13242
13243                 KASSERT(stcb != NULL, ("stcb is NULL"));
13244                 SCTP_TCB_LOCK_ASSERT(stcb);
13245                 KASSERT((asoc->state & SCTP_STATE_ABOUT_TO_BE_FREED) == 0,
13246                     ("Association about to be freed"));
13247                 KASSERT((asoc->state & SCTP_STATE_WAS_ABORTED) == 0,
13248                     ("Association was aborted"));
13249
13250                 while (uio->uio_resid > 0) {
13251                         /* How much room do we have? */
13252                         struct mbuf *new_tail, *mm;
13253
13254                         inqueue_bytes = asoc->total_output_queue_size - (asoc->chunks_on_out_queue * SCTP_DATA_CHUNK_OVERHEAD(stcb));
13255                         if (SCTP_SB_LIMIT_SND(so) > inqueue_bytes) {
13256                                 max_len = SCTP_SB_LIMIT_SND(so) - inqueue_bytes;
13257                         } else {
13258                                 max_len = 0;
13259                         }
13260                         if ((max_len > (ssize_t)SCTP_BASE_SYSCTL(sctp_add_more_threshold)) ||
13261                             ((max_len > 0) && (SCTP_SB_LIMIT_SND(so) < SCTP_BASE_SYSCTL(sctp_add_more_threshold))) ||
13262                             (uio->uio_resid <= max_len)) {
13263                                 SCTP_TCB_UNLOCK(stcb);
13264                                 sndout = 0;
13265                                 new_tail = NULL;
13266                                 mm = sctp_copy_resume(uio, (int)max_len, user_marks_eor, &error, &sndout, &new_tail);
13267                                 SCTP_TCB_LOCK(stcb);
13268                                 if ((asoc->state & SCTP_STATE_ABOUT_TO_BE_FREED) ||
13269                                     (asoc->state & SCTP_STATE_WAS_ABORTED)) {
13270                                         /*
13271                                          * We need to get out. Peer probably
13272                                          * aborted.
13273                                          */
13274                                         sctp_m_freem(mm);
13275                                         if (asoc->state & SCTP_STATE_WAS_ABORTED) {
13276                                                 /*
13277                                                  * XXX: Could also be
13278                                                  * ECONNABORTED, not enough
13279                                                  * info.
13280                                                  */
13281                                                 error = ECONNRESET;
13282                                         } else {
13283                                                 error = ENOTCONN;
13284                                         }
13285                                         goto out;
13286                                 }
13287                                 if ((mm == NULL) || (error != 0)) {
13288                                         if (mm != NULL) {
13289                                                 sctp_m_freem(mm);
13290                                         }
13291                                         if (sp != NULL) {
13292                                                 sp->processing = 0;
13293                                         }
13294                                         goto out;
13295                                 }
13296                                 /* Update the mbuf and count */
13297                                 if (sp->tail_mbuf != NULL) {
13298                                         /* Tack it to the end. */
13299                                         SCTP_BUF_NEXT(sp->tail_mbuf) = mm;
13300                                 } else {
13301                                         /* A stolen mbuf. */
13302                                         sp->data = mm;
13303                                 }
13304                                 sp->tail_mbuf = new_tail;
13305                                 sctp_snd_sb_alloc(stcb, sndout);
13306                                 atomic_add_int(&sp->length, sndout);
13307                                 if (sinfo_flags & SCTP_SACK_IMMEDIATELY) {
13308                                         sp->sinfo_flags |= SCTP_SACK_IMMEDIATELY;
13309                                 }
13310
13311                                 /* Did we reach EOR? */
13312                                 if ((uio->uio_resid == 0) &&
13313                                     ((user_marks_eor == 0) ||
13314                                     (sinfo_flags & SCTP_EOF) ||
13315                                     (user_marks_eor && (sinfo_flags & SCTP_EOR)))) {
13316                                         sp->msg_is_complete = 1;
13317                                 } else {
13318                                         sp->msg_is_complete = 0;
13319                                 }
13320                         }
13321
13322                         KASSERT(stcb != NULL, ("stcb is NULL"));
13323                         SCTP_TCB_LOCK_ASSERT(stcb);
13324                         KASSERT((asoc->state & SCTP_STATE_ABOUT_TO_BE_FREED) == 0,
13325                             ("Association about to be freed"));
13326                         KASSERT((asoc->state & SCTP_STATE_WAS_ABORTED) == 0,
13327                             ("Association was aborted"));
13328
13329                         if (uio->uio_resid == 0) {
13330                                 /* got it all? */
13331                                 continue;
13332                         }
13333                         /* PR-SCTP? */
13334                         if ((asoc->prsctp_supported) && (asoc->sent_queue_cnt_removeable > 0)) {
13335                                 /*
13336                                  * This is ugly but we must assure locking
13337                                  * order
13338                                  */
13339                                 sctp_prune_prsctp(stcb, asoc, sndrcvninfo, (int)sndlen);
13340                                 inqueue_bytes = asoc->total_output_queue_size - (asoc->chunks_on_out_queue * SCTP_DATA_CHUNK_OVERHEAD(stcb));
13341                                 if (SCTP_SB_LIMIT_SND(so) > inqueue_bytes)
13342                                         max_len = SCTP_SB_LIMIT_SND(so) - inqueue_bytes;
13343                                 else
13344                                         max_len = 0;
13345                                 if (max_len > 0) {
13346                                         continue;
13347                                 }
13348                         }
13349                         /* wait for space now */
13350                         if (non_blocking) {
13351                                 /* Non-blocking io in place out */
13352                                 if (sp != NULL) {
13353                                         sp->processing = 0;
13354                                 }
13355                                 goto skip_out_eof;
13356                         }
13357                         /* What about the INIT, send it maybe */
13358                         if (queue_only_for_init) {
13359                                 if (SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) {
13360                                         /* a collision took us forward? */
13361                                         queue_only = 0;
13362                                 } else {
13363                                         NET_EPOCH_ENTER(et);
13364                                         sctp_send_initiate(inp, stcb, SCTP_SO_LOCKED);
13365                                         NET_EPOCH_EXIT(et);
13366                                         SCTP_SET_STATE(stcb, SCTP_STATE_COOKIE_WAIT);
13367                                         queue_only = 1;
13368                                 }
13369                         }
13370                         if ((net->flight_size > net->cwnd) &&
13371                             (asoc->sctp_cmt_on_off == 0)) {
13372                                 SCTP_STAT_INCR(sctps_send_cwnd_avoid);
13373                                 queue_only = 1;
13374                         } else if (asoc->ifp_had_enobuf) {
13375                                 SCTP_STAT_INCR(sctps_ifnomemqueued);
13376                                 if (net->flight_size > (2 * net->mtu)) {
13377                                         queue_only = 1;
13378                                 }
13379                                 asoc->ifp_had_enobuf = 0;
13380                         }
13381                         un_sent = asoc->total_output_queue_size - asoc->total_flight;
13382                         if ((sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY)) &&
13383                             (asoc->total_flight > 0) &&
13384                             (asoc->stream_queue_cnt < SCTP_MAX_DATA_BUNDLING) &&
13385                             (un_sent < (int)(asoc->smallest_mtu - SCTP_MIN_OVERHEAD))) {
13386                                 /*-
13387                                  * Ok, Nagle is set on and we have data outstanding.
13388                                  * Don't send anything and let SACKs drive out the
13389                                  * data unless we have a "full" segment to send.
13390                                  */
13391                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
13392                                         sctp_log_nagle_event(stcb, SCTP_NAGLE_APPLIED);
13393                                 }
13394                                 SCTP_STAT_INCR(sctps_naglequeued);
13395                                 nagle_applies = 1;
13396                         } else {
13397                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
13398                                         if (sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY))
13399                                                 sctp_log_nagle_event(stcb, SCTP_NAGLE_SKIPPED);
13400                                 }
13401                                 SCTP_STAT_INCR(sctps_naglesent);
13402                                 nagle_applies = 0;
13403                         }
13404                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13405                                 sctp_misc_ints(SCTP_CWNDLOG_PRESEND, queue_only_for_init, queue_only,
13406                                     nagle_applies, un_sent);
13407                                 sctp_misc_ints(SCTP_CWNDLOG_PRESEND, asoc->total_output_queue_size,
13408                                     asoc->total_flight,
13409                                     asoc->chunks_on_out_queue, asoc->total_flight_count);
13410                         }
13411                         if (queue_only_for_init) {
13412                                 queue_only_for_init = 0;
13413                         }
13414                         if ((queue_only == 0) && (nagle_applies == 0)) {
13415                                 /*-
13416                                  * need to start chunk output
13417                                  * before blocking.. note that if
13418                                  * a lock is already applied, then
13419                                  * the input via the net is happening
13420                                  * and I don't need to start output :-D
13421                                  */
13422                                 NET_EPOCH_ENTER(et);
13423                                 sctp_chunk_output(inp, stcb,
13424                                     SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13425                                 NET_EPOCH_EXIT(et);
13426                         }
13427                         /*-
13428                          * This is a bit strange, but I think it will
13429                          * work. The total_output_queue_size is locked and
13430                          * protected by the TCB_LOCK, which we just released.
13431                          * There is a race that can occur between releasing it
13432                          * above, and me getting the socket lock, where sacks
13433                          * come in but we have not put the SB_WAIT on the
13434                          * so_snd buffer to get the wakeup. After the LOCK
13435                          * is applied the sack_processing will also need to
13436                          * LOCK the so->so_snd to do the actual sowwakeup(). So
13437                          * once we have the socket buffer lock if we recheck the
13438                          * size we KNOW we will get to sleep safely with the
13439                          * wakeup flag in place.
13440                          */
13441                         inqueue_bytes = asoc->total_output_queue_size - (asoc->chunks_on_out_queue * SCTP_DATA_CHUNK_OVERHEAD(stcb));
13442                         SOCKBUF_LOCK(&so->so_snd);
13443                         if (SCTP_SB_LIMIT_SND(so) <= (inqueue_bytes +
13444                             min(SCTP_BASE_SYSCTL(sctp_add_more_threshold), SCTP_SB_LIMIT_SND(so)))) {
13445                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13446                                         sctp_log_block(SCTP_BLOCK_LOG_INTO_BLK,
13447                                             asoc, uio->uio_resid);
13448                                 }
13449                                 be.error = 0;
13450                                 stcb->block_entry = &be;
13451                                 SCTP_TCB_UNLOCK(stcb);
13452                                 error = sbwait(so, SO_SND);
13453                                 if (error == 0) {
13454                                         if (so->so_error != 0)
13455                                                 error = so->so_error;
13456                                         if (be.error != 0) {
13457                                                 error = be.error;
13458                                         }
13459                                 }
13460                                 SOCKBUF_UNLOCK(&so->so_snd);
13461                                 SCTP_TCB_LOCK(stcb);
13462                                 stcb->block_entry = NULL;
13463                                 if ((asoc->state & SCTP_STATE_ABOUT_TO_BE_FREED) ||
13464                                     (asoc->state & SCTP_STATE_WAS_ABORTED)) {
13465                                         if (asoc->state & SCTP_STATE_WAS_ABORTED) {
13466                                                 /*
13467                                                  * XXX: Could also be
13468                                                  * ECONNABORTED, not enough
13469                                                  * info.
13470                                                  */
13471                                                 error = ECONNRESET;
13472                                         } else {
13473                                                 error = ENOTCONN;
13474                                         }
13475                                         goto out_unlocked;
13476                                 }
13477                                 if (error != 0) {
13478                                         if (sp != NULL) {
13479                                                 sp->processing = 0;
13480                                         }
13481                                         goto out_unlocked;
13482                                 }
13483                         } else {
13484                                 SOCKBUF_UNLOCK(&so->so_snd);
13485                         }
13486                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13487                                 sctp_log_block(SCTP_BLOCK_LOG_OUTOF_BLK,
13488                                     asoc, asoc->total_output_queue_size);
13489                         }
13490                 }
13491
13492                 KASSERT(stcb != NULL, ("stcb is NULL"));
13493                 SCTP_TCB_LOCK_ASSERT(stcb);
13494                 KASSERT((asoc->state & SCTP_STATE_ABOUT_TO_BE_FREED) == 0,
13495                     ("Association about to be freed"));
13496                 KASSERT((asoc->state & SCTP_STATE_WAS_ABORTED) == 0,
13497                     ("Association was aborted"));
13498
13499                 /* The out streams might be reallocated. */
13500                 strm = &asoc->strmout[sinfo_stream];
13501                 if (sp != NULL) {
13502                         if (sp->msg_is_complete == 0) {
13503                                 strm->last_msg_incomplete = 1;
13504                                 if (asoc->idata_supported == 0) {
13505                                         asoc->stream_locked = 1;
13506                                         asoc->stream_locked_on = sinfo_stream;
13507                                 }
13508                         } else {
13509                                 sp->sender_all_done = 1;
13510                                 strm->last_msg_incomplete = 0;
13511                                 asoc->stream_locked = 0;
13512                         }
13513                         sp->processing = 0;
13514                 } else {
13515                         SCTP_PRINTF("Huh no sp TSNH?\n");
13516                         strm->last_msg_incomplete = 0;
13517                         asoc->stream_locked = 0;
13518                 }
13519                 if (uio->uio_resid == 0) {
13520                         got_all_of_the_send = true;
13521                 }
13522         } else {
13523                 error = sctp_msg_append(stcb, net, top, sndrcvninfo);
13524                 top = NULL;
13525                 if ((sinfo_flags & SCTP_EOF) != 0) {
13526                         got_all_of_the_send = true;
13527                 }
13528         }
13529         if (error != 0) {
13530                 goto out;
13531         }
13532
13533 dataless_eof:
13534         KASSERT(stcb != NULL, ("stcb is NULL"));
13535         SCTP_TCB_LOCK_ASSERT(stcb);
13536         KASSERT((asoc->state & SCTP_STATE_ABOUT_TO_BE_FREED) == 0,
13537             ("Association about to be freed"));
13538         KASSERT((asoc->state & SCTP_STATE_WAS_ABORTED) == 0,
13539             ("Association was aborted"));
13540
13541         /* EOF thing ? */
13542         if ((sinfo_flags & SCTP_EOF) && got_all_of_the_send) {
13543                 SCTP_STAT_INCR(sctps_sends_with_eof);
13544                 error = 0;
13545                 if (TAILQ_EMPTY(&asoc->send_queue) &&
13546                     TAILQ_EMPTY(&asoc->sent_queue) &&
13547                     sctp_is_there_unsent_data(stcb, SCTP_SO_LOCKED) == 0) {
13548                         if ((*asoc->ss_functions.sctp_ss_is_user_msgs_incomplete) (stcb, asoc)) {
13549                                 goto abort_anyway;
13550                         }
13551                         /* there is nothing queued to send, so I'm done... */
13552                         if ((SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_SENT) &&
13553                             (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
13554                             (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
13555                                 struct sctp_nets *netp;
13556
13557                                 /* only send SHUTDOWN the first time through */
13558                                 if (SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) {
13559                                         SCTP_STAT_DECR_GAUGE32(sctps_currestab);
13560                                 }
13561                                 SCTP_SET_STATE(stcb, SCTP_STATE_SHUTDOWN_SENT);
13562                                 sctp_stop_timers_for_shutdown(stcb);
13563                                 if (asoc->alternate != NULL) {
13564                                         netp = asoc->alternate;
13565                                 } else {
13566                                         netp = asoc->primary_destination;
13567                                 }
13568                                 sctp_send_shutdown(stcb, netp);
13569                                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb,
13570                                     netp);
13571                                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
13572                                     NULL);
13573                         }
13574                 } else {
13575                         /*-
13576                          * we still got (or just got) data to send, so set
13577                          * SHUTDOWN_PENDING
13578                          */
13579                         /*-
13580                          * XXX sockets draft says that SCTP_EOF should be
13581                          * sent with no data.  currently, we will allow user
13582                          * data to be sent first and move to
13583                          * SHUTDOWN-PENDING
13584                          */
13585                         if ((SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_SENT) &&
13586                             (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
13587                             (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
13588                                 if ((*asoc->ss_functions.sctp_ss_is_user_msgs_incomplete) (stcb, asoc)) {
13589                                         SCTP_ADD_SUBSTATE(stcb, SCTP_STATE_PARTIAL_MSG_LEFT);
13590                                 }
13591                                 SCTP_ADD_SUBSTATE(stcb, SCTP_STATE_SHUTDOWN_PENDING);
13592                                 if (TAILQ_EMPTY(&asoc->send_queue) &&
13593                                     TAILQ_EMPTY(&asoc->sent_queue) &&
13594                                     (asoc->state & SCTP_STATE_PARTIAL_MSG_LEFT)) {
13595                                         struct mbuf *op_err;
13596                                         char msg[SCTP_DIAG_INFO_LEN];
13597
13598                         abort_anyway:
13599                                         if (free_cnt_applied) {
13600                                                 atomic_subtract_int(&asoc->refcnt, 1);
13601                                                 free_cnt_applied = false;
13602                                         }
13603                                         SCTP_SNPRINTF(msg, sizeof(msg),
13604                                             "%s:%d at %s", __FILE__, __LINE__, __func__);
13605                                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
13606                                             msg);
13607                                         NET_EPOCH_ENTER(et);
13608                                         sctp_abort_an_association(stcb->sctp_ep, stcb,
13609                                             op_err, false, SCTP_SO_LOCKED);
13610                                         NET_EPOCH_EXIT(et);
13611                                         stcb = NULL;
13612                                         error = ECONNABORTED;
13613                                         goto out;
13614                                 }
13615                                 sctp_feature_off(inp, SCTP_PCB_FLAGS_NODELAY);
13616                         }
13617                 }
13618         }
13619
13620 skip_out_eof:
13621         KASSERT(stcb != NULL, ("stcb is NULL"));
13622         SCTP_TCB_LOCK_ASSERT(stcb);
13623         KASSERT((asoc->state & SCTP_STATE_ABOUT_TO_BE_FREED) == 0,
13624             ("Association about to be freed"));
13625         KASSERT((asoc->state & SCTP_STATE_WAS_ABORTED) == 0,
13626             ("Association was aborted"));
13627
13628         some_on_control = !TAILQ_EMPTY(&asoc->control_send_queue);
13629         if (queue_only_for_init) {
13630                 if (SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) {
13631                         /* a collision took us forward? */
13632                         queue_only = 0;
13633                 } else {
13634                         NET_EPOCH_ENTER(et);
13635                         sctp_send_initiate(inp, stcb, SCTP_SO_LOCKED);
13636                         NET_EPOCH_EXIT(et);
13637                         SCTP_SET_STATE(stcb, SCTP_STATE_COOKIE_WAIT);
13638                         queue_only = 1;
13639                 }
13640         }
13641
13642         KASSERT(stcb != NULL, ("stcb is NULL"));
13643         SCTP_TCB_LOCK_ASSERT(stcb);
13644         KASSERT((asoc->state & SCTP_STATE_ABOUT_TO_BE_FREED) == 0,
13645             ("Association about to be freed"));
13646         KASSERT((asoc->state & SCTP_STATE_WAS_ABORTED) == 0,
13647             ("Association was aborted"));
13648
13649         if ((net->flight_size > net->cwnd) &&
13650             (asoc->sctp_cmt_on_off == 0)) {
13651                 SCTP_STAT_INCR(sctps_send_cwnd_avoid);
13652                 queue_only = 1;
13653         } else if (asoc->ifp_had_enobuf) {
13654                 SCTP_STAT_INCR(sctps_ifnomemqueued);
13655                 if (net->flight_size > (2 * net->mtu)) {
13656                         queue_only = 1;
13657                 }
13658                 asoc->ifp_had_enobuf = 0;
13659         }
13660         un_sent = asoc->total_output_queue_size - asoc->total_flight;
13661         if ((sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY)) &&
13662             (asoc->total_flight > 0) &&
13663             (asoc->stream_queue_cnt < SCTP_MAX_DATA_BUNDLING) &&
13664             (un_sent < (int)(asoc->smallest_mtu - SCTP_MIN_OVERHEAD))) {
13665                 /*-
13666                  * Ok, Nagle is set on and we have data outstanding.
13667                  * Don't send anything and let SACKs drive out the
13668                  * data unless wen have a "full" segment to send.
13669                  */
13670                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
13671                         sctp_log_nagle_event(stcb, SCTP_NAGLE_APPLIED);
13672                 }
13673                 SCTP_STAT_INCR(sctps_naglequeued);
13674                 nagle_applies = 1;
13675         } else {
13676                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
13677                         if (sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY))
13678                                 sctp_log_nagle_event(stcb, SCTP_NAGLE_SKIPPED);
13679                 }
13680                 SCTP_STAT_INCR(sctps_naglesent);
13681                 nagle_applies = 0;
13682         }
13683         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13684                 sctp_misc_ints(SCTP_CWNDLOG_PRESEND, queue_only_for_init, queue_only,
13685                     nagle_applies, un_sent);
13686                 sctp_misc_ints(SCTP_CWNDLOG_PRESEND, asoc->total_output_queue_size,
13687                     asoc->total_flight,
13688                     asoc->chunks_on_out_queue, asoc->total_flight_count);
13689         }
13690
13691         KASSERT(stcb != NULL, ("stcb is NULL"));
13692         SCTP_TCB_LOCK_ASSERT(stcb);
13693         KASSERT((asoc->state & SCTP_STATE_ABOUT_TO_BE_FREED) == 0,
13694             ("Association about to be freed"));
13695         KASSERT((asoc->state & SCTP_STATE_WAS_ABORTED) == 0,
13696             ("Association was aborted"));
13697
13698         NET_EPOCH_ENTER(et);
13699         if ((queue_only == 0) && (nagle_applies == 0) && (asoc->peers_rwnd && un_sent)) {
13700                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13701         } else if ((queue_only == 0) &&
13702                     (asoc->peers_rwnd == 0) &&
13703             (asoc->total_flight == 0)) {
13704                 /* We get to have a probe outstanding */
13705                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13706         } else if (some_on_control) {
13707                 int num_out, reason;
13708
13709                 /* Here we do control only */
13710                 (void)sctp_med_chunk_output(inp, stcb, asoc, &num_out,
13711                     &reason, 1, 1, &now, &now_filled,
13712                     sctp_get_frag_point(stcb),
13713                     SCTP_SO_LOCKED);
13714         }
13715         NET_EPOCH_EXIT(et);
13716         SCTPDBG(SCTP_DEBUG_OUTPUT1, "USR Send complete qo:%d prw:%d unsent:%d tf:%d cooq:%d toqs:%d err:%d\n",
13717             queue_only, asoc->peers_rwnd, un_sent,
13718             asoc->total_flight, asoc->chunks_on_out_queue,
13719             asoc->total_output_queue_size, error);
13720
13721         KASSERT(stcb != NULL, ("stcb is NULL"));
13722         SCTP_TCB_LOCK_ASSERT(stcb);
13723         KASSERT((asoc->state & SCTP_STATE_ABOUT_TO_BE_FREED) == 0,
13724             ("Association about to be freed"));
13725         KASSERT((asoc->state & SCTP_STATE_WAS_ABORTED) == 0,
13726             ("Association was aborted"));
13727
13728 out:
13729 out_unlocked:
13730         if (create_lock_applied) {
13731                 SCTP_ASOC_CREATE_UNLOCK(inp);
13732         }
13733         if (stcb != NULL) {
13734                 if (local_soresv) {
13735                         atomic_subtract_int(&asoc->sb_send_resv, (int)sndlen);
13736                 }
13737                 if (free_cnt_applied) {
13738                         atomic_subtract_int(&asoc->refcnt, 1);
13739                 }
13740                 SCTP_TCB_UNLOCK(stcb);
13741         }
13742         if (top != NULL) {
13743                 sctp_m_freem(top);
13744         }
13745         if (control != NULL) {
13746                 sctp_m_freem(control);
13747         }
13748         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, error);
13749         return (error);
13750 }
13751
13752 /*
13753  * generate an AUTHentication chunk, if required
13754  */
13755 struct mbuf *
13756 sctp_add_auth_chunk(struct mbuf *m, struct mbuf **m_end,
13757     struct sctp_auth_chunk **auth_ret, uint32_t *offset,
13758     struct sctp_tcb *stcb, uint8_t chunk)
13759 {
13760         struct mbuf *m_auth;
13761         struct sctp_auth_chunk *auth;
13762         int chunk_len;
13763         struct mbuf *cn;
13764
13765         if ((m_end == NULL) || (auth_ret == NULL) || (offset == NULL) ||
13766             (stcb == NULL))
13767                 return (m);
13768
13769         if (stcb->asoc.auth_supported == 0) {
13770                 return (m);
13771         }
13772         /* does the requested chunk require auth? */
13773         if (!sctp_auth_is_required_chunk(chunk, stcb->asoc.peer_auth_chunks)) {
13774                 return (m);
13775         }
13776         m_auth = sctp_get_mbuf_for_msg(sizeof(*auth), 0, M_NOWAIT, 1, MT_HEADER);
13777         if (m_auth == NULL) {
13778                 /* no mbuf's */
13779                 return (m);
13780         }
13781         /* reserve some space if this will be the first mbuf */
13782         if (m == NULL)
13783                 SCTP_BUF_RESV_UF(m_auth, SCTP_MIN_OVERHEAD);
13784         /* fill in the AUTH chunk details */
13785         auth = mtod(m_auth, struct sctp_auth_chunk *);
13786         memset(auth, 0, sizeof(*auth));
13787         auth->ch.chunk_type = SCTP_AUTHENTICATION;
13788         auth->ch.chunk_flags = 0;
13789         chunk_len = sizeof(*auth) +
13790             sctp_get_hmac_digest_len(stcb->asoc.peer_hmac_id);
13791         auth->ch.chunk_length = htons(chunk_len);
13792         auth->hmac_id = htons(stcb->asoc.peer_hmac_id);
13793         /* key id and hmac digest will be computed and filled in upon send */
13794
13795         /* save the offset where the auth was inserted into the chain */
13796         *offset = 0;
13797         for (cn = m; cn; cn = SCTP_BUF_NEXT(cn)) {
13798                 *offset += SCTP_BUF_LEN(cn);
13799         }
13800
13801         /* update length and return pointer to the auth chunk */
13802         SCTP_BUF_LEN(m_auth) = chunk_len;
13803         m = sctp_copy_mbufchain(m_auth, m, m_end, 1, chunk_len, 0);
13804         if (auth_ret != NULL)
13805                 *auth_ret = auth;
13806
13807         return (m);
13808 }
13809
13810 #ifdef INET6
13811 int
13812 sctp_v6src_match_nexthop(struct sockaddr_in6 *src6, sctp_route_t *ro)
13813 {
13814         struct nd_prefix *pfx = NULL;
13815         struct nd_pfxrouter *pfxrtr = NULL;
13816         struct sockaddr_in6 gw6;
13817
13818         if (ro == NULL || ro->ro_nh == NULL || src6->sin6_family != AF_INET6)
13819                 return (0);
13820
13821         /* get prefix entry of address */
13822         ND6_RLOCK();
13823         LIST_FOREACH(pfx, &MODULE_GLOBAL(nd_prefix), ndpr_entry) {
13824                 if (pfx->ndpr_stateflags & NDPRF_DETACHED)
13825                         continue;
13826                 if (IN6_ARE_MASKED_ADDR_EQUAL(&pfx->ndpr_prefix.sin6_addr,
13827                     &src6->sin6_addr, &pfx->ndpr_mask))
13828                         break;
13829         }
13830         /* no prefix entry in the prefix list */
13831         if (pfx == NULL) {
13832                 ND6_RUNLOCK();
13833                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "No prefix entry for ");
13834                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)src6);
13835                 return (0);
13836         }
13837
13838         SCTPDBG(SCTP_DEBUG_OUTPUT2, "v6src_match_nexthop(), Prefix entry is ");
13839         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)src6);
13840
13841         /* search installed gateway from prefix entry */
13842         LIST_FOREACH(pfxrtr, &pfx->ndpr_advrtrs, pfr_entry) {
13843                 memset(&gw6, 0, sizeof(struct sockaddr_in6));
13844                 gw6.sin6_family = AF_INET6;
13845                 gw6.sin6_len = sizeof(struct sockaddr_in6);
13846                 memcpy(&gw6.sin6_addr, &pfxrtr->router->rtaddr,
13847                     sizeof(struct in6_addr));
13848                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "prefix router is ");
13849                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)&gw6);
13850                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "installed router is ");
13851                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, &ro->ro_nh->gw_sa);
13852                 if (sctp_cmpaddr((struct sockaddr *)&gw6, &ro->ro_nh->gw_sa)) {
13853                         ND6_RUNLOCK();
13854                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "pfxrouter is installed\n");
13855                         return (1);
13856                 }
13857         }
13858         ND6_RUNLOCK();
13859         SCTPDBG(SCTP_DEBUG_OUTPUT2, "pfxrouter is not installed\n");
13860         return (0);
13861 }
13862 #endif
13863
13864 int
13865 sctp_v4src_match_nexthop(struct sctp_ifa *sifa, sctp_route_t *ro)
13866 {
13867 #ifdef INET
13868         struct sockaddr_in *sin, *mask;
13869         struct ifaddr *ifa;
13870         struct in_addr srcnetaddr, gwnetaddr;
13871
13872         if (ro == NULL || ro->ro_nh == NULL ||
13873             sifa->address.sa.sa_family != AF_INET) {
13874                 return (0);
13875         }
13876         ifa = (struct ifaddr *)sifa->ifa;
13877         mask = (struct sockaddr_in *)(ifa->ifa_netmask);
13878         sin = &sifa->address.sin;
13879         srcnetaddr.s_addr = (sin->sin_addr.s_addr & mask->sin_addr.s_addr);
13880         SCTPDBG(SCTP_DEBUG_OUTPUT1, "match_nexthop4: src address is ");
13881         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, &sifa->address.sa);
13882         SCTPDBG(SCTP_DEBUG_OUTPUT1, "network address is %x\n", srcnetaddr.s_addr);
13883
13884         sin = &ro->ro_nh->gw4_sa;
13885         gwnetaddr.s_addr = (sin->sin_addr.s_addr & mask->sin_addr.s_addr);
13886         SCTPDBG(SCTP_DEBUG_OUTPUT1, "match_nexthop4: nexthop is ");
13887         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, &ro->ro_nh->gw_sa);
13888         SCTPDBG(SCTP_DEBUG_OUTPUT1, "network address is %x\n", gwnetaddr.s_addr);
13889         if (srcnetaddr.s_addr == gwnetaddr.s_addr) {
13890                 return (1);
13891         }
13892 #endif
13893         return (0);
13894 }