sys/netinet/sctp_output.c

   1 /*-
   2  * Copyright (c) 2001-2008, by Cisco Systems, Inc. All rights reserved.
   3  * Copyright (c) 2008-2012, by Randall Stewart. All rights reserved.
   4  * Copyright (c) 2008-2012, by Michael Tuexen. All rights reserved.
   5  *
   6  * Redistribution and use in source and binary forms, with or without
   7  * modification, are permitted provided that the following conditions are met:
   8  *
   9  * a) Redistributions of source code must retain the above copyright notice,
  10  *    this list of conditions and the following disclaimer.
  11  *
  12  * b) Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in
  14  *    the documentation and/or other materials provided with the distribution.
  15  *
  16  * c) Neither the name of Cisco Systems, Inc. nor the names of its
  17  *    contributors may be used to endorse or promote products derived
  18  *    from this software without specific prior written permission.
  19  *
  20  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  21  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
  22  * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  23  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
  24  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  25  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  26  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  27  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  28  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  29  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
  30  * THE POSSIBILITY OF SUCH DAMAGE.
  31  */
  32
  33 #include <sys/cdefs.h>
  34 __FBSDID("$FreeBSD$");
  35
  36 #include <netinet/sctp_os.h>
  37 #include <sys/proc.h>
  38 #include <netinet/sctp_var.h>
  39 #include <netinet/sctp_sysctl.h>
  40 #include <netinet/sctp_header.h>
  41 #include <netinet/sctp_pcb.h>
  42 #include <netinet/sctputil.h>
  43 #include <netinet/sctp_output.h>
  44 #include <netinet/sctp_uio.h>
  45 #include <netinet/sctputil.h>
  46 #include <netinet/sctp_auth.h>
  47 #include <netinet/sctp_timer.h>
  48 #include <netinet/sctp_asconf.h>
  49 #include <netinet/sctp_indata.h>
  50 #include <netinet/sctp_bsd_addr.h>
  51 #include <netinet/sctp_input.h>
  52 #include <netinet/sctp_crc32.h>
  53 #include <netinet/udp.h>
  54 #include <netinet/udp_var.h>
  55 #include <machine/in_cksum.h>
  56
  57
  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 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
1864 int
1865 sctp_is_address_in_scope(struct sctp_ifa *ifa,
1866     struct sctp_scoping *scope,
1867     int do_update)
1868 {
1869         if ((scope->loopback_scope == 0) &&
1870             (ifa->ifn_p) && SCTP_IFN_IS_IFT_LOOP(ifa->ifn_p)) {
1871                 /*
1872                  * skip loopback if not in scope *
1873                  */
1874                 return (0);
1875         }
1876         switch (ifa->address.sa.sa_family) {
1877 #ifdef INET
1878         case AF_INET:
1879                 if (scope->ipv4_addr_legal) {
1880                         struct sockaddr_in *sin;
1881
1882                         sin = (struct sockaddr_in *)&ifa->address.sin;
1883                         if (sin->sin_addr.s_addr == 0) {
1884                                 /* not in scope , unspecified */
1885                                 return (0);
1886                         }
1887                         if ((scope->ipv4_local_scope == 0) &&
1888                             (IN4_ISPRIVATE_ADDRESS(&sin->sin_addr))) {
1889                                 /* private address not in scope */
1890                                 return (0);
1891                         }
1892                 } else {
1893                         return (0);
1894                 }
1895                 break;
1896 #endif
1897 #ifdef INET6
1898         case AF_INET6:
1899                 if (scope->ipv6_addr_legal) {
1900                         struct sockaddr_in6 *sin6;
1901
1902                         /*
1903                          * Must update the flags,  bummer, which means any
1904                          * IFA locks must now be applied HERE <->
1905                          */
1906                         if (do_update) {
1907                                 sctp_gather_internal_ifa_flags(ifa);
1908                         }
1909                         if (ifa->localifa_flags & SCTP_ADDR_IFA_UNUSEABLE) {
1910                                 return (0);
1911                         }
1912                         /* ok to use deprecated addresses? */
1913                         sin6 = (struct sockaddr_in6 *)&ifa->address.sin6;
1914                         if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) {
1915                                 /* skip unspecifed addresses */
1916                                 return (0);
1917                         }
1918                         if (    /* (local_scope == 0) && */
1919                             (IN6_IS_ADDR_LINKLOCAL(&sin6->sin6_addr))) {
1920                                 return (0);
1921                         }
1922                         if ((scope->site_scope == 0) &&
1923                             (IN6_IS_ADDR_SITELOCAL(&sin6->sin6_addr))) {
1924                                 return (0);
1925                         }
1926                 } else {
1927                         return (0);
1928                 }
1929                 break;
1930 #endif
1931         default:
1932                 return (0);
1933         }
1934         return (1);
1935 }
1936
1937 static struct mbuf *
1938 sctp_add_addr_to_mbuf(struct mbuf *m, struct sctp_ifa *ifa, uint16_t * len)
1939 {
1940 #if defined(INET) || defined(INET6)
1941         struct sctp_paramhdr *parmh;
1942         struct mbuf *mret;
1943         uint16_t plen;
1944
1945 #endif
1946
1947         switch (ifa->address.sa.sa_family) {
1948 #ifdef INET
1949         case AF_INET:
1950                 plen = (uint16_t) sizeof(struct sctp_ipv4addr_param);
1951                 break;
1952 #endif
1953 #ifdef INET6
1954         case AF_INET6:
1955                 plen = (uint16_t) sizeof(struct sctp_ipv6addr_param);
1956                 break;
1957 #endif
1958         default:
1959                 return (m);
1960         }
1961 #if defined(INET) || defined(INET6)
1962         if (M_TRAILINGSPACE(m) >= plen) {
1963                 /* easy side we just drop it on the end */
1964                 parmh = (struct sctp_paramhdr *)(SCTP_BUF_AT(m, SCTP_BUF_LEN(m)));
1965                 mret = m;
1966         } else {
1967                 /* Need more space */
1968                 mret = m;
1969                 while (SCTP_BUF_NEXT(mret) != NULL) {
1970                         mret = SCTP_BUF_NEXT(mret);
1971                 }
1972                 SCTP_BUF_NEXT(mret) = sctp_get_mbuf_for_msg(plen, 0, M_NOWAIT, 1, MT_DATA);
1973                 if (SCTP_BUF_NEXT(mret) == NULL) {
1974                         /* We are hosed, can't add more addresses */
1975                         return (m);
1976                 }
1977                 mret = SCTP_BUF_NEXT(mret);
1978                 parmh = mtod(mret, struct sctp_paramhdr *);
1979         }
1980         /* now add the parameter */
1981         switch (ifa->address.sa.sa_family) {
1982 #ifdef INET
1983         case AF_INET:
1984                 {
1985                         struct sctp_ipv4addr_param *ipv4p;
1986                         struct sockaddr_in *sin;
1987
1988                         sin = (struct sockaddr_in *)&ifa->address.sin;
1989                         ipv4p = (struct sctp_ipv4addr_param *)parmh;
1990                         parmh->param_type = htons(SCTP_IPV4_ADDRESS);
1991                         parmh->param_length = htons(plen);
1992                         ipv4p->addr = sin->sin_addr.s_addr;
1993                         SCTP_BUF_LEN(mret) += plen;
1994                         break;
1995                 }
1996 #endif
1997 #ifdef INET6
1998         case AF_INET6:
1999                 {
2000                         struct sctp_ipv6addr_param *ipv6p;
2001                         struct sockaddr_in6 *sin6;
2002
2003                         sin6 = (struct sockaddr_in6 *)&ifa->address.sin6;
2004                         ipv6p = (struct sctp_ipv6addr_param *)parmh;
2005                         parmh->param_type = htons(SCTP_IPV6_ADDRESS);
2006                         parmh->param_length = htons(plen);
2007                         memcpy(ipv6p->addr, &sin6->sin6_addr,
2008                             sizeof(ipv6p->addr));
2009                         /* clear embedded scope in the address */
2010                         in6_clearscope((struct in6_addr *)ipv6p->addr);
2011                         SCTP_BUF_LEN(mret) += plen;
2012                         break;
2013                 }
2014 #endif
2015         default:
2016                 return (m);
2017         }
2018         if (len != NULL) {
2019                 *len += plen;
2020         }
2021         return (mret);
2022 #endif
2023 }
2024
2025
2026 struct mbuf *
2027 sctp_add_addresses_to_i_ia(struct sctp_inpcb *inp, struct sctp_tcb *stcb,
2028     struct sctp_scoping *scope,
2029     struct mbuf *m_at, int cnt_inits_to,
2030     uint16_t * padding_len, uint16_t * chunk_len)
2031 {
2032         struct sctp_vrf *vrf = NULL;
2033         int cnt, limit_out = 0, total_count;
2034         uint32_t vrf_id;
2035
2036         vrf_id = inp->def_vrf_id;
2037         SCTP_IPI_ADDR_RLOCK();
2038         vrf = sctp_find_vrf(vrf_id);
2039         if (vrf == NULL) {
2040                 SCTP_IPI_ADDR_RUNLOCK();
2041                 return (m_at);
2042         }
2043         if (inp->sctp_flags & SCTP_PCB_FLAGS_BOUNDALL) {
2044                 struct sctp_ifa *sctp_ifap;
2045                 struct sctp_ifn *sctp_ifnp;
2046
2047                 cnt = cnt_inits_to;
2048                 if (vrf->total_ifa_count > SCTP_COUNT_LIMIT) {
2049                         limit_out = 1;
2050                         cnt = SCTP_ADDRESS_LIMIT;
2051                         goto skip_count;
2052                 }
2053                 LIST_FOREACH(sctp_ifnp, &vrf->ifnlist, next_ifn) {
2054                         if ((scope->loopback_scope == 0) &&
2055                             SCTP_IFN_IS_IFT_LOOP(sctp_ifnp)) {
2056                                 /*
2057                                  * Skip loopback devices if loopback_scope
2058                                  * not set
2059                                  */
2060                                 continue;
2061                         }
2062                         LIST_FOREACH(sctp_ifap, &sctp_ifnp->ifalist, next_ifa) {
2063                                 if (sctp_is_addr_restricted(stcb, sctp_ifap)) {
2064                                         continue;
2065                                 }
2066                                 if (sctp_is_address_in_scope(sctp_ifap, scope, 1) == 0) {
2067                                         continue;
2068                                 }
2069                                 cnt++;
2070                                 if (cnt > SCTP_ADDRESS_LIMIT) {
2071                                         break;
2072                                 }
2073                         }
2074                         if (cnt > SCTP_ADDRESS_LIMIT) {
2075                                 break;
2076                         }
2077                 }
2078 skip_count:
2079                 if (cnt > 1) {
2080                         total_count = 0;
2081                         LIST_FOREACH(sctp_ifnp, &vrf->ifnlist, next_ifn) {
2082                                 cnt = 0;
2083                                 if ((scope->loopback_scope == 0) &&
2084                                     SCTP_IFN_IS_IFT_LOOP(sctp_ifnp)) {
2085                                         /*
2086                                          * Skip loopback devices if
2087                                          * loopback_scope not set
2088                                          */
2089                                         continue;
2090                                 }
2091                                 LIST_FOREACH(sctp_ifap, &sctp_ifnp->ifalist, next_ifa) {
2092                                         if (sctp_is_addr_restricted(stcb, sctp_ifap)) {
2093                                                 continue;
2094                                         }
2095                                         if (sctp_is_address_in_scope(sctp_ifap,
2096                                             scope, 0) == 0) {
2097                                                 continue;
2098                                         }
2099                                         if ((chunk_len != NULL) &&
2100                                             (padding_len != NULL) &&
2101                                             (*padding_len > 0)) {
2102                                                 memset(mtod(m_at, caddr_t)+*chunk_len, 0, *padding_len);
2103                                                 SCTP_BUF_LEN(m_at) += *padding_len;
2104                                                 *chunk_len += *padding_len;
2105                                                 *padding_len = 0;
2106                                         }
2107                                         m_at = sctp_add_addr_to_mbuf(m_at, sctp_ifap, chunk_len);
2108                                         if (limit_out) {
2109                                                 cnt++;
2110                                                 total_count++;
2111                                                 if (cnt >= 2) {
2112                                                         /*
2113                                                          * two from each
2114                                                          * address
2115                                                          */
2116                                                         break;
2117                                                 }
2118                                                 if (total_count > SCTP_ADDRESS_LIMIT) {
2119                                                         /* No more addresses */
2120                                                         break;
2121                                                 }
2122                                         }
2123                                 }
2124                         }
2125                 }
2126         } else {
2127                 struct sctp_laddr *laddr;
2128
2129                 cnt = cnt_inits_to;
2130                 /* First, how many ? */
2131                 LIST_FOREACH(laddr, &inp->sctp_addr_list, sctp_nxt_addr) {
2132                         if (laddr->ifa == NULL) {
2133                                 continue;
2134                         }
2135                         if (laddr->ifa->localifa_flags & SCTP_BEING_DELETED)
2136                                 /*
2137                                  * Address being deleted by the system, dont
2138                                  * list.
2139                                  */
2140                                 continue;
2141                         if (laddr->action == SCTP_DEL_IP_ADDRESS) {
2142                                 /*
2143                                  * Address being deleted on this ep don't
2144                                  * list.
2145                                  */
2146                                 continue;
2147                         }
2148                         if (sctp_is_address_in_scope(laddr->ifa,
2149                             scope, 1) == 0) {
2150                                 continue;
2151                         }
2152                         cnt++;
2153                 }
2154                 /*
2155                  * To get through a NAT we only list addresses if we have
2156                  * more than one. That way if you just bind a single address
2157                  * we let the source of the init dictate our address.
2158                  */
2159                 if (cnt > 1) {
2160                         cnt = cnt_inits_to;
2161                         LIST_FOREACH(laddr, &inp->sctp_addr_list, sctp_nxt_addr) {
2162                                 if (laddr->ifa == NULL) {
2163                                         continue;
2164                                 }
2165                                 if (laddr->ifa->localifa_flags & SCTP_BEING_DELETED) {
2166                                         continue;
2167                                 }
2168                                 if (sctp_is_address_in_scope(laddr->ifa,
2169                                     scope, 0) == 0) {
2170                                         continue;
2171                                 }
2172                                 if ((chunk_len != NULL) &&
2173                                     (padding_len != NULL) &&
2174                                     (*padding_len > 0)) {
2175                                         memset(mtod(m_at, caddr_t)+*chunk_len, 0, *padding_len);
2176                                         SCTP_BUF_LEN(m_at) += *padding_len;
2177                                         *chunk_len += *padding_len;
2178                                         *padding_len = 0;
2179                                 }
2180                                 m_at = sctp_add_addr_to_mbuf(m_at, laddr->ifa, chunk_len);
2181                                 cnt++;
2182                                 if (cnt >= SCTP_ADDRESS_LIMIT) {
2183                                         break;
2184                                 }
2185                         }
2186                 }
2187         }
2188         SCTP_IPI_ADDR_RUNLOCK();
2189         return (m_at);
2190 }
2191
2192 static struct sctp_ifa *
2193 sctp_is_ifa_addr_preferred(struct sctp_ifa *ifa,
2194     uint8_t dest_is_loop,
2195     uint8_t dest_is_priv,
2196     sa_family_t fam)
2197 {
2198         uint8_t dest_is_global = 0;
2199
2200         /* dest_is_priv is true if destination is a private address */
2201         /* dest_is_loop is true if destination is a loopback addresses */
2202
2203         /**
2204          * Here we determine if its a preferred address. A preferred address
2205          * means it is the same scope or higher scope then the destination.
2206          * L = loopback, P = private, G = global
2207          * -----------------------------------------
2208          *    src    |  dest | result
2209          *  ----------------------------------------
2210          *     L     |    L  |    yes
2211          *  -----------------------------------------
2212          *     P     |    L  |    yes-v4 no-v6
2213          *  -----------------------------------------
2214          *     G     |    L  |    yes-v4 no-v6
2215          *  -----------------------------------------
2216          *     L     |    P  |    no
2217          *  -----------------------------------------
2218          *     P     |    P  |    yes
2219          *  -----------------------------------------
2220          *     G     |    P  |    no
2221          *   -----------------------------------------
2222          *     L     |    G  |    no
2223          *   -----------------------------------------
2224          *     P     |    G  |    no
2225          *    -----------------------------------------
2226          *     G     |    G  |    yes
2227          *    -----------------------------------------
2228          */
2229
2230         if (ifa->address.sa.sa_family != fam) {
2231                 /* forget mis-matched family */
2232                 return (NULL);
2233         }
2234         if ((dest_is_priv == 0) && (dest_is_loop == 0)) {
2235                 dest_is_global = 1;
2236         }
2237         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Is destination preferred:");
2238         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, &ifa->address.sa);
2239         /* Ok the address may be ok */
2240 #ifdef INET6
2241         if (fam == AF_INET6) {
2242                 /* ok to use deprecated addresses? no lets not! */
2243                 if (ifa->localifa_flags & SCTP_ADDR_IFA_UNUSEABLE) {
2244                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:1\n");
2245                         return (NULL);
2246                 }
2247                 if (ifa->src_is_priv && !ifa->src_is_loop) {
2248                         if (dest_is_loop) {
2249                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:2\n");
2250                                 return (NULL);
2251                         }
2252                 }
2253                 if (ifa->src_is_glob) {
2254                         if (dest_is_loop) {
2255                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:3\n");
2256                                 return (NULL);
2257                         }
2258                 }
2259         }
2260 #endif
2261         /*
2262          * Now that we know what is what, implement or table this could in
2263          * theory be done slicker (it used to be), but this is
2264          * straightforward and easier to validate :-)
2265          */
2266         SCTPDBG(SCTP_DEBUG_OUTPUT3, "src_loop:%d src_priv:%d src_glob:%d\n",
2267             ifa->src_is_loop, ifa->src_is_priv, ifa->src_is_glob);
2268         SCTPDBG(SCTP_DEBUG_OUTPUT3, "dest_loop:%d dest_priv:%d dest_glob:%d\n",
2269             dest_is_loop, dest_is_priv, dest_is_global);
2270
2271         if ((ifa->src_is_loop) && (dest_is_priv)) {
2272                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:4\n");
2273                 return (NULL);
2274         }
2275         if ((ifa->src_is_glob) && (dest_is_priv)) {
2276                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:5\n");
2277                 return (NULL);
2278         }
2279         if ((ifa->src_is_loop) && (dest_is_global)) {
2280                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:6\n");
2281                 return (NULL);
2282         }
2283         if ((ifa->src_is_priv) && (dest_is_global)) {
2284                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:7\n");
2285                 return (NULL);
2286         }
2287         SCTPDBG(SCTP_DEBUG_OUTPUT3, "YES\n");
2288         /* its a preferred address */
2289         return (ifa);
2290 }
2291
2292 static struct sctp_ifa *
2293 sctp_is_ifa_addr_acceptable(struct sctp_ifa *ifa,
2294     uint8_t dest_is_loop,
2295     uint8_t dest_is_priv,
2296     sa_family_t fam)
2297 {
2298         uint8_t dest_is_global = 0;
2299
2300         /**
2301          * Here we determine if its a acceptable address. A acceptable
2302          * address means it is the same scope or higher scope but we can
2303          * allow for NAT which means its ok to have a global dest and a
2304          * private src.
2305          *
2306          * L = loopback, P = private, G = global
2307          * -----------------------------------------
2308          *  src    |  dest | result
2309          * -----------------------------------------
2310          *   L     |   L   |    yes
2311          *  -----------------------------------------
2312          *   P     |   L   |    yes-v4 no-v6
2313          *  -----------------------------------------
2314          *   G     |   L   |    yes
2315          * -----------------------------------------
2316          *   L     |   P   |    no
2317          * -----------------------------------------
2318          *   P     |   P   |    yes
2319          * -----------------------------------------
2320          *   G     |   P   |    yes - May not work
2321          * -----------------------------------------
2322          *   L     |   G   |    no
2323          * -----------------------------------------
2324          *   P     |   G   |    yes - May not work
2325          * -----------------------------------------
2326          *   G     |   G   |    yes
2327          * -----------------------------------------
2328          */
2329
2330         if (ifa->address.sa.sa_family != fam) {
2331                 /* forget non matching family */
2332                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "ifa_fam:%d fam:%d\n",
2333                     ifa->address.sa.sa_family, fam);
2334                 return (NULL);
2335         }
2336         /* Ok the address may be ok */
2337         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT3, &ifa->address.sa);
2338         SCTPDBG(SCTP_DEBUG_OUTPUT3, "dst_is_loop:%d dest_is_priv:%d\n",
2339             dest_is_loop, dest_is_priv);
2340         if ((dest_is_loop == 0) && (dest_is_priv == 0)) {
2341                 dest_is_global = 1;
2342         }
2343 #ifdef INET6
2344         if (fam == AF_INET6) {
2345                 /* ok to use deprecated addresses? */
2346                 if (ifa->localifa_flags & SCTP_ADDR_IFA_UNUSEABLE) {
2347                         return (NULL);
2348                 }
2349                 if (ifa->src_is_priv) {
2350                         /* Special case, linklocal to loop */
2351                         if (dest_is_loop)
2352                                 return (NULL);
2353                 }
2354         }
2355 #endif
2356         /*
2357          * Now that we know what is what, implement our table. This could in
2358          * theory be done slicker (it used to be), but this is
2359          * straightforward and easier to validate :-)
2360          */
2361         SCTPDBG(SCTP_DEBUG_OUTPUT3, "ifa->src_is_loop:%d dest_is_priv:%d\n",
2362             ifa->src_is_loop,
2363             dest_is_priv);
2364         if ((ifa->src_is_loop == 1) && (dest_is_priv)) {
2365                 return (NULL);
2366         }
2367         SCTPDBG(SCTP_DEBUG_OUTPUT3, "ifa->src_is_loop:%d dest_is_glob:%d\n",
2368             ifa->src_is_loop,
2369             dest_is_global);
2370         if ((ifa->src_is_loop == 1) && (dest_is_global)) {
2371                 return (NULL);
2372         }
2373         SCTPDBG(SCTP_DEBUG_OUTPUT3, "address is acceptable\n");
2374         /* its an acceptable address */
2375         return (ifa);
2376 }
2377
2378 int
2379 sctp_is_addr_restricted(struct sctp_tcb *stcb, struct sctp_ifa *ifa)
2380 {
2381         struct sctp_laddr *laddr;
2382
2383         if (stcb == NULL) {
2384                 /* There are no restrictions, no TCB :-) */
2385                 return (0);
2386         }
2387         LIST_FOREACH(laddr, &stcb->asoc.sctp_restricted_addrs, sctp_nxt_addr) {
2388                 if (laddr->ifa == NULL) {
2389                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "%s: NULL ifa\n",
2390                             __FUNCTION__);
2391                         continue;
2392                 }
2393                 if (laddr->ifa == ifa) {
2394                         /* Yes it is on the list */
2395                         return (1);
2396                 }
2397         }
2398         return (0);
2399 }
2400
2401
2402 int
2403 sctp_is_addr_in_ep(struct sctp_inpcb *inp, struct sctp_ifa *ifa)
2404 {
2405         struct sctp_laddr *laddr;
2406
2407         if (ifa == NULL)
2408                 return (0);
2409         LIST_FOREACH(laddr, &inp->sctp_addr_list, sctp_nxt_addr) {
2410                 if (laddr->ifa == NULL) {
2411                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "%s: NULL ifa\n",
2412                             __FUNCTION__);
2413                         continue;
2414                 }
2415                 if ((laddr->ifa == ifa) && laddr->action == 0)
2416                         /* same pointer */
2417                         return (1);
2418         }
2419         return (0);
2420 }
2421
2422
2423
2424 static struct sctp_ifa *
2425 sctp_choose_boundspecific_inp(struct sctp_inpcb *inp,
2426     sctp_route_t * ro,
2427     uint32_t vrf_id,
2428     int non_asoc_addr_ok,
2429     uint8_t dest_is_priv,
2430     uint8_t dest_is_loop,
2431     sa_family_t fam)
2432 {
2433         struct sctp_laddr *laddr, *starting_point;
2434         void *ifn;
2435         int resettotop = 0;
2436         struct sctp_ifn *sctp_ifn;
2437         struct sctp_ifa *sctp_ifa, *sifa;
2438         struct sctp_vrf *vrf;
2439         uint32_t ifn_index;
2440
2441         vrf = sctp_find_vrf(vrf_id);
2442         if (vrf == NULL)
2443                 return (NULL);
2444
2445         ifn = SCTP_GET_IFN_VOID_FROM_ROUTE(ro);
2446         ifn_index = SCTP_GET_IF_INDEX_FROM_ROUTE(ro);
2447         sctp_ifn = sctp_find_ifn(ifn, ifn_index);
2448         /*
2449          * first question, is the ifn we will emit on in our list, if so, we
2450          * want such an address. Note that we first looked for a preferred
2451          * address.
2452          */
2453         if (sctp_ifn) {
2454                 /* is a preferred one on the interface we route out? */
2455                 LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
2456                         if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
2457                             (non_asoc_addr_ok == 0))
2458                                 continue;
2459                         sifa = sctp_is_ifa_addr_preferred(sctp_ifa,
2460                             dest_is_loop,
2461                             dest_is_priv, fam);
2462                         if (sifa == NULL)
2463                                 continue;
2464                         if (sctp_is_addr_in_ep(inp, sifa)) {
2465                                 atomic_add_int(&sifa->refcount, 1);
2466                                 return (sifa);
2467                         }
2468                 }
2469         }
2470         /*
2471          * ok, now we now need to find one on the list of the addresses. We
2472          * can't get one on the emitting interface so let's find first a
2473          * preferred one. If not that an acceptable one otherwise... we
2474          * return NULL.
2475          */
2476         starting_point = inp->next_addr_touse;
2477 once_again:
2478         if (inp->next_addr_touse == NULL) {
2479                 inp->next_addr_touse = LIST_FIRST(&inp->sctp_addr_list);
2480                 resettotop = 1;
2481         }
2482         for (laddr = inp->next_addr_touse; laddr;
2483             laddr = LIST_NEXT(laddr, sctp_nxt_addr)) {
2484                 if (laddr->ifa == NULL) {
2485                         /* address has been removed */
2486                         continue;
2487                 }
2488                 if (laddr->action == SCTP_DEL_IP_ADDRESS) {
2489                         /* address is being deleted */
2490                         continue;
2491                 }
2492                 sifa = sctp_is_ifa_addr_preferred(laddr->ifa, dest_is_loop,
2493                     dest_is_priv, fam);
2494                 if (sifa == NULL)
2495                         continue;
2496                 atomic_add_int(&sifa->refcount, 1);
2497                 return (sifa);
2498         }
2499         if (resettotop == 0) {
2500                 inp->next_addr_touse = NULL;
2501                 goto once_again;
2502         }
2503         inp->next_addr_touse = starting_point;
2504         resettotop = 0;
2505 once_again_too:
2506         if (inp->next_addr_touse == NULL) {
2507                 inp->next_addr_touse = LIST_FIRST(&inp->sctp_addr_list);
2508                 resettotop = 1;
2509         }
2510         /* ok, what about an acceptable address in the inp */
2511         for (laddr = inp->next_addr_touse; laddr;
2512             laddr = LIST_NEXT(laddr, sctp_nxt_addr)) {
2513                 if (laddr->ifa == NULL) {
2514                         /* address has been removed */
2515                         continue;
2516                 }
2517                 if (laddr->action == SCTP_DEL_IP_ADDRESS) {
2518                         /* address is being deleted */
2519                         continue;
2520                 }
2521                 sifa = sctp_is_ifa_addr_acceptable(laddr->ifa, dest_is_loop,
2522                     dest_is_priv, fam);
2523                 if (sifa == NULL)
2524                         continue;
2525                 atomic_add_int(&sifa->refcount, 1);
2526                 return (sifa);
2527         }
2528         if (resettotop == 0) {
2529                 inp->next_addr_touse = NULL;
2530                 goto once_again_too;
2531         }
2532         /*
2533          * no address bound can be a source for the destination we are in
2534          * trouble
2535          */
2536         return (NULL);
2537 }
2538
2539
2540
2541 static struct sctp_ifa *
2542 sctp_choose_boundspecific_stcb(struct sctp_inpcb *inp,
2543     struct sctp_tcb *stcb,
2544     sctp_route_t * ro,
2545     uint32_t vrf_id,
2546     uint8_t dest_is_priv,
2547     uint8_t dest_is_loop,
2548     int non_asoc_addr_ok,
2549     sa_family_t fam)
2550 {
2551         struct sctp_laddr *laddr, *starting_point;
2552         void *ifn;
2553         struct sctp_ifn *sctp_ifn;
2554         struct sctp_ifa *sctp_ifa, *sifa;
2555         uint8_t start_at_beginning = 0;
2556         struct sctp_vrf *vrf;
2557         uint32_t ifn_index;
2558
2559         /*
2560          * first question, is the ifn we will emit on in our list, if so, we
2561          * want that one.
2562          */
2563         vrf = sctp_find_vrf(vrf_id);
2564         if (vrf == NULL)
2565                 return (NULL);
2566
2567         ifn = SCTP_GET_IFN_VOID_FROM_ROUTE(ro);
2568         ifn_index = SCTP_GET_IF_INDEX_FROM_ROUTE(ro);
2569         sctp_ifn = sctp_find_ifn(ifn, ifn_index);
2570
2571         /*
2572          * first question, is the ifn we will emit on in our list?  If so,
2573          * we want that one. First we look for a preferred. Second, we go
2574          * for an acceptable.
2575          */
2576         if (sctp_ifn) {
2577                 /* first try for a preferred address on the ep */
2578                 LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
2579                         if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) && (non_asoc_addr_ok == 0))
2580                                 continue;
2581                         if (sctp_is_addr_in_ep(inp, sctp_ifa)) {
2582                                 sifa = sctp_is_ifa_addr_preferred(sctp_ifa, dest_is_loop, dest_is_priv, fam);
2583                                 if (sifa == NULL)
2584                                         continue;
2585                                 if (((non_asoc_addr_ok == 0) &&
2586                                     (sctp_is_addr_restricted(stcb, sifa))) ||
2587                                     (non_asoc_addr_ok &&
2588                                     (sctp_is_addr_restricted(stcb, sifa)) &&
2589                                     (!sctp_is_addr_pending(stcb, sifa)))) {
2590                                         /* on the no-no list */
2591                                         continue;
2592                                 }
2593                                 atomic_add_int(&sifa->refcount, 1);
2594                                 return (sifa);
2595                         }
2596                 }
2597                 /* next try for an acceptable address on the ep */
2598                 LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
2599                         if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) && (non_asoc_addr_ok == 0))
2600                                 continue;
2601                         if (sctp_is_addr_in_ep(inp, sctp_ifa)) {
2602                                 sifa = sctp_is_ifa_addr_acceptable(sctp_ifa, dest_is_loop, dest_is_priv, fam);
2603                                 if (sifa == NULL)
2604                                         continue;
2605                                 if (((non_asoc_addr_ok == 0) &&
2606                                     (sctp_is_addr_restricted(stcb, sifa))) ||
2607                                     (non_asoc_addr_ok &&
2608                                     (sctp_is_addr_restricted(stcb, sifa)) &&
2609                                     (!sctp_is_addr_pending(stcb, sifa)))) {
2610                                         /* on the no-no list */
2611                                         continue;
2612                                 }
2613                                 atomic_add_int(&sifa->refcount, 1);
2614                                 return (sifa);
2615                         }
2616                 }
2617
2618         }
2619         /*
2620          * if we can't find one like that then we must look at all addresses
2621          * bound to pick one at first preferable then secondly acceptable.
2622          */
2623         starting_point = stcb->asoc.last_used_address;
2624 sctp_from_the_top:
2625         if (stcb->asoc.last_used_address == NULL) {
2626                 start_at_beginning = 1;
2627                 stcb->asoc.last_used_address = LIST_FIRST(&inp->sctp_addr_list);
2628         }
2629         /* search beginning with the last used address */
2630         for (laddr = stcb->asoc.last_used_address; laddr;
2631             laddr = LIST_NEXT(laddr, sctp_nxt_addr)) {
2632                 if (laddr->ifa == NULL) {
2633                         /* address has been removed */
2634                         continue;
2635                 }
2636                 if (laddr->action == SCTP_DEL_IP_ADDRESS) {
2637                         /* address is being deleted */
2638                         continue;
2639                 }
2640                 sifa = sctp_is_ifa_addr_preferred(laddr->ifa, dest_is_loop, dest_is_priv, fam);
2641                 if (sifa == NULL)
2642                         continue;
2643                 if (((non_asoc_addr_ok == 0) &&
2644                     (sctp_is_addr_restricted(stcb, sifa))) ||
2645                     (non_asoc_addr_ok &&
2646                     (sctp_is_addr_restricted(stcb, sifa)) &&
2647                     (!sctp_is_addr_pending(stcb, sifa)))) {
2648                         /* on the no-no list */
2649                         continue;
2650                 }
2651                 stcb->asoc.last_used_address = laddr;
2652                 atomic_add_int(&sifa->refcount, 1);
2653                 return (sifa);
2654         }
2655         if (start_at_beginning == 0) {
2656                 stcb->asoc.last_used_address = NULL;
2657                 goto sctp_from_the_top;
2658         }
2659         /* now try for any higher scope than the destination */
2660         stcb->asoc.last_used_address = starting_point;
2661         start_at_beginning = 0;
2662 sctp_from_the_top2:
2663         if (stcb->asoc.last_used_address == NULL) {
2664                 start_at_beginning = 1;
2665                 stcb->asoc.last_used_address = LIST_FIRST(&inp->sctp_addr_list);
2666         }
2667         /* search beginning with the last used address */
2668         for (laddr = stcb->asoc.last_used_address; laddr;
2669             laddr = LIST_NEXT(laddr, sctp_nxt_addr)) {
2670                 if (laddr->ifa == NULL) {
2671                         /* address has been removed */
2672                         continue;
2673                 }
2674                 if (laddr->action == SCTP_DEL_IP_ADDRESS) {
2675                         /* address is being deleted */
2676                         continue;
2677                 }
2678                 sifa = sctp_is_ifa_addr_acceptable(laddr->ifa, dest_is_loop,
2679                     dest_is_priv, fam);
2680                 if (sifa == NULL)
2681                         continue;
2682                 if (((non_asoc_addr_ok == 0) &&
2683                     (sctp_is_addr_restricted(stcb, sifa))) ||
2684                     (non_asoc_addr_ok &&
2685                     (sctp_is_addr_restricted(stcb, sifa)) &&
2686                     (!sctp_is_addr_pending(stcb, sifa)))) {
2687                         /* on the no-no list */
2688                         continue;
2689                 }
2690                 stcb->asoc.last_used_address = laddr;
2691                 atomic_add_int(&sifa->refcount, 1);
2692                 return (sifa);
2693         }
2694         if (start_at_beginning == 0) {
2695                 stcb->asoc.last_used_address = NULL;
2696                 goto sctp_from_the_top2;
2697         }
2698         return (NULL);
2699 }
2700
2701 static struct sctp_ifa *
2702 sctp_select_nth_preferred_addr_from_ifn_boundall(struct sctp_ifn *ifn,
2703     struct sctp_tcb *stcb,
2704     int non_asoc_addr_ok,
2705     uint8_t dest_is_loop,
2706     uint8_t dest_is_priv,
2707     int addr_wanted,
2708     sa_family_t fam,
2709     sctp_route_t * ro
2710 )
2711 {
2712         struct sctp_ifa *ifa, *sifa;
2713         int num_eligible_addr = 0;
2714
2715 #ifdef INET6
2716         struct sockaddr_in6 sin6, lsa6;
2717
2718         if (fam == AF_INET6) {
2719                 memcpy(&sin6, &ro->ro_dst, sizeof(struct sockaddr_in6));
2720                 (void)sa6_recoverscope(&sin6);
2721         }
2722 #endif                          /* INET6 */
2723         LIST_FOREACH(ifa, &ifn->ifalist, next_ifa) {
2724                 if ((ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
2725                     (non_asoc_addr_ok == 0))
2726                         continue;
2727                 sifa = sctp_is_ifa_addr_preferred(ifa, dest_is_loop,
2728                     dest_is_priv, fam);
2729                 if (sifa == NULL)
2730                         continue;
2731 #ifdef INET6
2732                 if (fam == AF_INET6 &&
2733                     dest_is_loop &&
2734                     sifa->src_is_loop && sifa->src_is_priv) {
2735                         /*
2736                          * don't allow fe80::1 to be a src on loop ::1, we
2737                          * don't list it to the peer so we will get an
2738                          * abort.
2739                          */
2740                         continue;
2741                 }
2742                 if (fam == AF_INET6 &&
2743                     IN6_IS_ADDR_LINKLOCAL(&sifa->address.sin6.sin6_addr) &&
2744                     IN6_IS_ADDR_LINKLOCAL(&sin6.sin6_addr)) {
2745                         /*
2746                          * link-local <-> link-local must belong to the same
2747                          * scope.
2748                          */
2749                         memcpy(&lsa6, &sifa->address.sin6, sizeof(struct sockaddr_in6));
2750                         (void)sa6_recoverscope(&lsa6);
2751                         if (sin6.sin6_scope_id != lsa6.sin6_scope_id) {
2752                                 continue;
2753                         }
2754                 }
2755 #endif                          /* INET6 */
2756
2757                 /*
2758                  * Check if the IPv6 address matches to next-hop. In the
2759                  * mobile case, old IPv6 address may be not deleted from the
2760                  * interface. Then, the interface has previous and new
2761                  * addresses.  We should use one corresponding to the
2762                  * next-hop.  (by micchie)
2763                  */
2764 #ifdef INET6
2765                 if (stcb && fam == AF_INET6 &&
2766                     sctp_is_mobility_feature_on(stcb->sctp_ep, SCTP_MOBILITY_BASE)) {
2767                         if (sctp_v6src_match_nexthop(&sifa->address.sin6, ro)
2768                             == 0) {
2769                                 continue;
2770                         }
2771                 }
2772 #endif
2773 #ifdef INET
2774                 /* Avoid topologically incorrect IPv4 address */
2775                 if (stcb && fam == AF_INET &&
2776                     sctp_is_mobility_feature_on(stcb->sctp_ep, SCTP_MOBILITY_BASE)) {
2777                         if (sctp_v4src_match_nexthop(sifa, ro) == 0) {
2778                                 continue;
2779                         }
2780                 }
2781 #endif
2782                 if (stcb) {
2783                         if (sctp_is_address_in_scope(ifa, &stcb->asoc.scope, 0) == 0) {
2784                                 continue;
2785                         }
2786                         if (((non_asoc_addr_ok == 0) &&
2787                             (sctp_is_addr_restricted(stcb, sifa))) ||
2788                             (non_asoc_addr_ok &&
2789                             (sctp_is_addr_restricted(stcb, sifa)) &&
2790                             (!sctp_is_addr_pending(stcb, sifa)))) {
2791                                 /*
2792                                  * It is restricted for some reason..
2793                                  * probably not yet added.
2794                                  */
2795                                 continue;
2796                         }
2797                 }
2798                 if (num_eligible_addr >= addr_wanted) {
2799                         return (sifa);
2800                 }
2801                 num_eligible_addr++;
2802         }
2803         return (NULL);
2804 }
2805
2806
2807 static int
2808 sctp_count_num_preferred_boundall(struct sctp_ifn *ifn,
2809     struct sctp_tcb *stcb,
2810     int non_asoc_addr_ok,
2811     uint8_t dest_is_loop,
2812     uint8_t dest_is_priv,
2813     sa_family_t fam)
2814 {
2815         struct sctp_ifa *ifa, *sifa;
2816         int num_eligible_addr = 0;
2817
2818         LIST_FOREACH(ifa, &ifn->ifalist, next_ifa) {
2819                 if ((ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
2820                     (non_asoc_addr_ok == 0)) {
2821                         continue;
2822                 }
2823                 sifa = sctp_is_ifa_addr_preferred(ifa, dest_is_loop,
2824                     dest_is_priv, fam);
2825                 if (sifa == NULL) {
2826                         continue;
2827                 }
2828                 if (stcb) {
2829                         if (sctp_is_address_in_scope(ifa, &stcb->asoc.scope, 0) == 0) {
2830                                 continue;
2831                         }
2832                         if (((non_asoc_addr_ok == 0) &&
2833                             (sctp_is_addr_restricted(stcb, sifa))) ||
2834                             (non_asoc_addr_ok &&
2835                             (sctp_is_addr_restricted(stcb, sifa)) &&
2836                             (!sctp_is_addr_pending(stcb, sifa)))) {
2837                                 /*
2838                                  * It is restricted for some reason..
2839                                  * probably not yet added.
2840                                  */
2841                                 continue;
2842                         }
2843                 }
2844                 num_eligible_addr++;
2845         }
2846         return (num_eligible_addr);
2847 }
2848
2849 static struct sctp_ifa *
2850 sctp_choose_boundall(struct sctp_tcb *stcb,
2851     struct sctp_nets *net,
2852     sctp_route_t * ro,
2853     uint32_t vrf_id,
2854     uint8_t dest_is_priv,
2855     uint8_t dest_is_loop,
2856     int non_asoc_addr_ok,
2857     sa_family_t fam)
2858 {
2859         int cur_addr_num = 0, num_preferred = 0;
2860         void *ifn;
2861         struct sctp_ifn *sctp_ifn, *looked_at = NULL, *emit_ifn;
2862         struct sctp_ifa *sctp_ifa, *sifa;
2863         uint32_t ifn_index;
2864         struct sctp_vrf *vrf;
2865
2866 #ifdef INET
2867         int retried = 0;
2868
2869 #endif
2870
2871         /*-
2872          * For boundall we can use any address in the association.
2873          * If non_asoc_addr_ok is set we can use any address (at least in
2874          * theory). So we look for preferred addresses first. If we find one,
2875          * we use it. Otherwise we next try to get an address on the
2876          * interface, which we should be able to do (unless non_asoc_addr_ok
2877          * is false and we are routed out that way). In these cases where we
2878          * can't use the address of the interface we go through all the
2879          * ifn's looking for an address we can use and fill that in. Punting
2880          * means we send back address 0, which will probably cause problems
2881          * actually since then IP will fill in the address of the route ifn,
2882          * which means we probably already rejected it.. i.e. here comes an
2883          * abort :-<.
2884          */
2885         vrf = sctp_find_vrf(vrf_id);
2886         if (vrf == NULL)
2887                 return (NULL);
2888
2889         ifn = SCTP_GET_IFN_VOID_FROM_ROUTE(ro);
2890         ifn_index = SCTP_GET_IF_INDEX_FROM_ROUTE(ro);
2891         SCTPDBG(SCTP_DEBUG_OUTPUT2, "ifn from route:%p ifn_index:%d\n", ifn, ifn_index);
2892         emit_ifn = looked_at = sctp_ifn = sctp_find_ifn(ifn, ifn_index);
2893         if (sctp_ifn == NULL) {
2894                 /* ?? We don't have this guy ?? */
2895                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "No ifn emit interface?\n");
2896                 goto bound_all_plan_b;
2897         }
2898         SCTPDBG(SCTP_DEBUG_OUTPUT2, "ifn_index:%d name:%s is emit interface\n",
2899             ifn_index, sctp_ifn->ifn_name);
2900
2901         if (net) {
2902                 cur_addr_num = net->indx_of_eligible_next_to_use;
2903         }
2904         num_preferred = sctp_count_num_preferred_boundall(sctp_ifn,
2905             stcb,
2906             non_asoc_addr_ok,
2907             dest_is_loop,
2908             dest_is_priv, fam);
2909         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Found %d preferred source addresses for intf:%s\n",
2910             num_preferred, sctp_ifn->ifn_name);
2911         if (num_preferred == 0) {
2912                 /*
2913                  * no eligible addresses, we must use some other interface
2914                  * address if we can find one.
2915                  */
2916                 goto bound_all_plan_b;
2917         }
2918         /*
2919          * Ok we have num_eligible_addr set with how many we can use, this
2920          * may vary from call to call due to addresses being deprecated
2921          * etc..
2922          */
2923         if (cur_addr_num >= num_preferred) {
2924                 cur_addr_num = 0;
2925         }
2926         /*
2927          * select the nth address from the list (where cur_addr_num is the
2928          * nth) and 0 is the first one, 1 is the second one etc...
2929          */
2930         SCTPDBG(SCTP_DEBUG_OUTPUT2, "cur_addr_num:%d\n", cur_addr_num);
2931
2932         sctp_ifa = sctp_select_nth_preferred_addr_from_ifn_boundall(sctp_ifn, stcb, non_asoc_addr_ok, dest_is_loop,
2933             dest_is_priv, cur_addr_num, fam, ro);
2934
2935         /* if sctp_ifa is NULL something changed??, fall to plan b. */
2936         if (sctp_ifa) {
2937                 atomic_add_int(&sctp_ifa->refcount, 1);
2938                 if (net) {
2939                         /* save off where the next one we will want */
2940                         net->indx_of_eligible_next_to_use = cur_addr_num + 1;
2941                 }
2942                 return (sctp_ifa);
2943         }
2944         /*
2945          * plan_b: Look at all interfaces and find a preferred address. If
2946          * no preferred fall through to plan_c.
2947          */
2948 bound_all_plan_b:
2949         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Trying Plan B\n");
2950         LIST_FOREACH(sctp_ifn, &vrf->ifnlist, next_ifn) {
2951                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "Examine interface %s\n",
2952                     sctp_ifn->ifn_name);
2953                 if (dest_is_loop == 0 && SCTP_IFN_IS_IFT_LOOP(sctp_ifn)) {
2954                         /* wrong base scope */
2955                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "skip\n");
2956                         continue;
2957                 }
2958                 if ((sctp_ifn == looked_at) && looked_at) {
2959                         /* already looked at this guy */
2960                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "already seen\n");
2961                         continue;
2962                 }
2963                 num_preferred = sctp_count_num_preferred_boundall(sctp_ifn, stcb, non_asoc_addr_ok,
2964                     dest_is_loop, dest_is_priv, fam);
2965                 SCTPDBG(SCTP_DEBUG_OUTPUT2,
2966                     "Found ifn:%p %d preferred source addresses\n",
2967                     ifn, num_preferred);
2968                 if (num_preferred == 0) {
2969                         /* None on this interface. */
2970                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "No prefered -- skipping to next\n");
2971                         continue;
2972                 }
2973                 SCTPDBG(SCTP_DEBUG_OUTPUT2,
2974                     "num preferred:%d on interface:%p cur_addr_num:%d\n",
2975                     num_preferred, (void *)sctp_ifn, cur_addr_num);
2976
2977                 /*
2978                  * Ok we have num_eligible_addr set with how many we can
2979                  * use, this may vary from call to call due to addresses
2980                  * being deprecated etc..
2981                  */
2982                 if (cur_addr_num >= num_preferred) {
2983                         cur_addr_num = 0;
2984                 }
2985                 sifa = sctp_select_nth_preferred_addr_from_ifn_boundall(sctp_ifn, stcb, non_asoc_addr_ok, dest_is_loop,
2986                     dest_is_priv, cur_addr_num, fam, ro);
2987                 if (sifa == NULL)
2988                         continue;
2989                 if (net) {
2990                         net->indx_of_eligible_next_to_use = cur_addr_num + 1;
2991                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "we selected %d\n",
2992                             cur_addr_num);
2993                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Source:");
2994                         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, &sifa->address.sa);
2995                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Dest:");
2996                         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, &net->ro._l_addr.sa);
2997                 }
2998                 atomic_add_int(&sifa->refcount, 1);
2999                 return (sifa);
3000         }
3001 #ifdef INET
3002 again_with_private_addresses_allowed:
3003 #endif
3004         /* plan_c: do we have an acceptable address on the emit interface */
3005         sifa = NULL;
3006         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Trying Plan C: find acceptable on interface\n");
3007         if (emit_ifn == NULL) {
3008                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "Jump to Plan D - no emit_ifn\n");
3009                 goto plan_d;
3010         }
3011         LIST_FOREACH(sctp_ifa, &emit_ifn->ifalist, next_ifa) {
3012                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "ifa:%p\n", (void *)sctp_ifa);
3013                 if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
3014                     (non_asoc_addr_ok == 0)) {
3015                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Defer\n");
3016                         continue;
3017                 }
3018                 sifa = sctp_is_ifa_addr_acceptable(sctp_ifa, dest_is_loop,
3019                     dest_is_priv, fam);
3020                 if (sifa == NULL) {
3021                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "IFA not acceptable\n");
3022                         continue;
3023                 }
3024                 if (stcb) {
3025                         if (sctp_is_address_in_scope(sifa, &stcb->asoc.scope, 0) == 0) {
3026                                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "NOT in scope\n");
3027                                 sifa = NULL;
3028                                 continue;
3029                         }
3030                         if (((non_asoc_addr_ok == 0) &&
3031                             (sctp_is_addr_restricted(stcb, sifa))) ||
3032                             (non_asoc_addr_ok &&
3033                             (sctp_is_addr_restricted(stcb, sifa)) &&
3034                             (!sctp_is_addr_pending(stcb, sifa)))) {
3035                                 /*
3036                                  * It is restricted for some reason..
3037                                  * probably not yet added.
3038                                  */
3039                                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "Its resticted\n");
3040                                 sifa = NULL;
3041                                 continue;
3042                         }
3043                 } else {
3044                         SCTP_PRINTF("Stcb is null - no print\n");
3045                 }
3046                 atomic_add_int(&sifa->refcount, 1);
3047                 goto out;
3048         }
3049 plan_d:
3050         /*
3051          * plan_d: We are in trouble. No preferred address on the emit
3052          * interface. And not even a preferred address on all interfaces. Go
3053          * out and see if we can find an acceptable address somewhere
3054          * amongst all interfaces.
3055          */
3056         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Trying Plan D looked_at is %p\n", (void *)looked_at);
3057         LIST_FOREACH(sctp_ifn, &vrf->ifnlist, next_ifn) {
3058                 if (dest_is_loop == 0 && SCTP_IFN_IS_IFT_LOOP(sctp_ifn)) {
3059                         /* wrong base scope */
3060                         continue;
3061                 }
3062                 LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
3063                         if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
3064                             (non_asoc_addr_ok == 0))
3065                                 continue;
3066                         sifa = sctp_is_ifa_addr_acceptable(sctp_ifa,
3067                             dest_is_loop,
3068                             dest_is_priv, fam);
3069                         if (sifa == NULL)
3070                                 continue;
3071                         if (stcb) {
3072                                 if (sctp_is_address_in_scope(sifa, &stcb->asoc.scope, 0) == 0) {
3073                                         sifa = NULL;
3074                                         continue;
3075                                 }
3076                                 if (((non_asoc_addr_ok == 0) &&
3077                                     (sctp_is_addr_restricted(stcb, sifa))) ||
3078                                     (non_asoc_addr_ok &&
3079                                     (sctp_is_addr_restricted(stcb, sifa)) &&
3080                                     (!sctp_is_addr_pending(stcb, sifa)))) {
3081                                         /*
3082                                          * It is restricted for some
3083                                          * reason.. probably not yet added.
3084                                          */
3085                                         sifa = NULL;
3086                                         continue;
3087                                 }
3088                         }
3089                         goto out;
3090                 }
3091         }
3092 #ifdef INET
3093         if ((retried == 0) && (stcb->asoc.scope.ipv4_local_scope == 0)) {
3094                 stcb->asoc.scope.ipv4_local_scope = 1;
3095                 retried = 1;
3096                 goto again_with_private_addresses_allowed;
3097         } else if (retried == 1) {
3098                 stcb->asoc.scope.ipv4_local_scope = 0;
3099         }
3100 #endif
3101 out:
3102 #ifdef INET
3103         if (sifa) {
3104                 if (retried == 1) {
3105                         LIST_FOREACH(sctp_ifn, &vrf->ifnlist, next_ifn) {
3106                                 if (dest_is_loop == 0 && SCTP_IFN_IS_IFT_LOOP(sctp_ifn)) {
3107                                         /* wrong base scope */
3108                                         continue;
3109                                 }
3110                                 LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
3111                                         struct sctp_ifa *tmp_sifa;
3112
3113                                         if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
3114                                             (non_asoc_addr_ok == 0))
3115                                                 continue;
3116                                         tmp_sifa = sctp_is_ifa_addr_acceptable(sctp_ifa,
3117                                             dest_is_loop,
3118                                             dest_is_priv, fam);
3119                                         if (tmp_sifa == NULL) {
3120                                                 continue;
3121                                         }
3122                                         if (tmp_sifa == sifa) {
3123                                                 continue;
3124                                         }
3125                                         if (stcb) {
3126                                                 if (sctp_is_address_in_scope(tmp_sifa,
3127                                                     &stcb->asoc.scope, 0) == 0) {
3128                                                         continue;
3129                                                 }
3130                                                 if (((non_asoc_addr_ok == 0) &&
3131                                                     (sctp_is_addr_restricted(stcb, tmp_sifa))) ||
3132                                                     (non_asoc_addr_ok &&
3133                                                     (sctp_is_addr_restricted(stcb, tmp_sifa)) &&
3134                                                     (!sctp_is_addr_pending(stcb, tmp_sifa)))) {
3135                                                         /*
3136                                                          * It is restricted
3137                                                          * for some reason..
3138                                                          * probably not yet
3139                                                          * added.
3140                                                          */
3141                                                         continue;
3142                                                 }
3143                                         }
3144                                         if ((tmp_sifa->address.sin.sin_family == AF_INET) &&
3145                                             (IN4_ISPRIVATE_ADDRESS(&(tmp_sifa->address.sin.sin_addr)))) {
3146                                                 sctp_add_local_addr_restricted(stcb, tmp_sifa);
3147                                         }
3148                                 }
3149                         }
3150                 }
3151                 atomic_add_int(&sifa->refcount, 1);
3152         }
3153 #endif
3154         return (sifa);
3155 }
3156
3157
3158
3159 /* tcb may be NULL */
3160 struct sctp_ifa *
3161 sctp_source_address_selection(struct sctp_inpcb *inp,
3162     struct sctp_tcb *stcb,
3163     sctp_route_t * ro,
3164     struct sctp_nets *net,
3165     int non_asoc_addr_ok, uint32_t vrf_id)
3166 {
3167         struct sctp_ifa *answer;
3168         uint8_t dest_is_priv, dest_is_loop;
3169         sa_family_t fam;
3170
3171 #ifdef INET
3172         struct sockaddr_in *to = (struct sockaddr_in *)&ro->ro_dst;
3173
3174 #endif
3175 #ifdef INET6
3176         struct sockaddr_in6 *to6 = (struct sockaddr_in6 *)&ro->ro_dst;
3177
3178 #endif
3179
3180         /**
3181          * Rules: - Find the route if needed, cache if I can. - Look at
3182          * interface address in route, Is it in the bound list. If so we
3183          * have the best source. - If not we must rotate amongst the
3184          * addresses.
3185          *
3186          * Cavets and issues
3187          *
3188          * Do we need to pay attention to scope. We can have a private address
3189          * or a global address we are sourcing or sending to. So if we draw
3190          * it out
3191          * zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz
3192          * For V4
3193          * ------------------------------------------
3194          *      source     *      dest  *  result
3195          * -----------------------------------------
3196          * <a>  Private    *    Global  *  NAT
3197          * -----------------------------------------
3198          * <b>  Private    *    Private *  No problem
3199          * -----------------------------------------
3200          * <c>  Global     *    Private *  Huh, How will this work?
3201          * -----------------------------------------
3202          * <d>  Global     *    Global  *  No Problem
3203          *------------------------------------------
3204          * zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz
3205          * For V6
3206          *------------------------------------------
3207          *      source     *      dest  *  result
3208          * -----------------------------------------
3209          * <a>  Linklocal  *    Global  *
3210          * -----------------------------------------
3211          * <b>  Linklocal  * Linklocal  *  No problem
3212          * -----------------------------------------
3213          * <c>  Global     * Linklocal  *  Huh, How will this work?
3214          * -----------------------------------------
3215          * <d>  Global     *    Global  *  No Problem
3216          *------------------------------------------
3217          * zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz
3218          *
3219          * And then we add to that what happens if there are multiple addresses
3220          * assigned to an interface. Remember the ifa on a ifn is a linked
3221          * list of addresses. So one interface can have more than one IP
3222          * address. What happens if we have both a private and a global
3223          * address? Do we then use context of destination to sort out which
3224          * one is best? And what about NAT's sending P->G may get you a NAT
3225          * translation, or should you select the G thats on the interface in
3226          * preference.
3227          *
3228          * Decisions:
3229          *
3230          * - count the number of addresses on the interface.
3231          * - if it is one, no problem except case <c>.
3232          *   For <a> we will assume a NAT out there.
3233          * - if there are more than one, then we need to worry about scope P
3234          *   or G. We should prefer G -> G and P -> P if possible.
3235          *   Then as a secondary fall back to mixed types G->P being a last
3236          *   ditch one.
3237          * - The above all works for bound all, but bound specific we need to
3238          *   use the same concept but instead only consider the bound
3239          *   addresses. If the bound set is NOT assigned to the interface then
3240          *   we must use rotation amongst the bound addresses..
3241          */
3242         if (ro->ro_rt == NULL) {
3243                 /*
3244                  * Need a route to cache.
3245                  */
3246                 SCTP_RTALLOC(ro, vrf_id);
3247         }
3248         if (ro->ro_rt == NULL) {
3249                 return (NULL);
3250         }
3251         fam = ro->ro_dst.sa_family;
3252         dest_is_priv = dest_is_loop = 0;
3253         /* Setup our scopes for the destination */
3254         switch (fam) {
3255 #ifdef INET
3256         case AF_INET:
3257                 /* Scope based on outbound address */
3258                 if (IN4_ISLOOPBACK_ADDRESS(&to->sin_addr)) {
3259                         dest_is_loop = 1;
3260                         if (net != NULL) {
3261                                 /* mark it as local */
3262                                 net->addr_is_local = 1;
3263                         }
3264                 } else if ((IN4_ISPRIVATE_ADDRESS(&to->sin_addr))) {
3265                         dest_is_priv = 1;
3266                 }
3267                 break;
3268 #endif
3269 #ifdef INET6
3270         case AF_INET6:
3271                 /* Scope based on outbound address */
3272                 if (IN6_IS_ADDR_LOOPBACK(&to6->sin6_addr) ||
3273                     SCTP_ROUTE_IS_REAL_LOOP(ro)) {
3274                         /*
3275                          * If the address is a loopback address, which
3276                          * consists of "::1" OR "fe80::1%lo0", we are
3277                          * loopback scope. But we don't use dest_is_priv
3278                          * (link local addresses).
3279                          */
3280                         dest_is_loop = 1;
3281                         if (net != NULL) {
3282                                 /* mark it as local */
3283                                 net->addr_is_local = 1;
3284                         }
3285                 } else if (IN6_IS_ADDR_LINKLOCAL(&to6->sin6_addr)) {
3286                         dest_is_priv = 1;
3287                 }
3288                 break;
3289 #endif
3290         }
3291         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Select source addr for:");
3292         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)&ro->ro_dst);
3293         SCTP_IPI_ADDR_RLOCK();
3294         if (inp->sctp_flags & SCTP_PCB_FLAGS_BOUNDALL) {
3295                 /*
3296                  * Bound all case
3297                  */
3298                 answer = sctp_choose_boundall(stcb, net, ro, vrf_id,
3299                     dest_is_priv, dest_is_loop,
3300                     non_asoc_addr_ok, fam);
3301                 SCTP_IPI_ADDR_RUNLOCK();
3302                 return (answer);
3303         }
3304         /*
3305          * Subset bound case
3306          */
3307         if (stcb) {
3308                 answer = sctp_choose_boundspecific_stcb(inp, stcb, ro,
3309                     vrf_id, dest_is_priv,
3310                     dest_is_loop,
3311                     non_asoc_addr_ok, fam);
3312         } else {
3313                 answer = sctp_choose_boundspecific_inp(inp, ro, vrf_id,
3314                     non_asoc_addr_ok,
3315                     dest_is_priv,
3316                     dest_is_loop, fam);
3317         }
3318         SCTP_IPI_ADDR_RUNLOCK();
3319         return (answer);
3320 }
3321
3322 static int
3323 sctp_find_cmsg(int c_type, void *data, struct mbuf *control, size_t cpsize)
3324 {
3325         struct cmsghdr cmh;
3326         int tlen, at, found;
3327         struct sctp_sndinfo sndinfo;
3328         struct sctp_prinfo prinfo;
3329         struct sctp_authinfo authinfo;
3330
3331         tlen = SCTP_BUF_LEN(control);
3332         at = 0;
3333         found = 0;
3334         /*
3335          * Independent of how many mbufs, find the c_type inside the control
3336          * structure and copy out the data.
3337          */
3338         while (at < tlen) {
3339                 if ((tlen - at) < (int)CMSG_ALIGN(sizeof(cmh))) {
3340                         /* There is not enough room for one more. */
3341                         return (found);
3342                 }
3343                 m_copydata(control, at, sizeof(cmh), (caddr_t)&cmh);
3344                 if (cmh.cmsg_len < CMSG_ALIGN(sizeof(cmh))) {
3345                         /* We dont't have a complete CMSG header. */
3346                         return (found);
3347                 }
3348                 if (((int)cmh.cmsg_len + at) > tlen) {
3349                         /* We don't have the complete CMSG. */
3350                         return (found);
3351                 }
3352                 if ((cmh.cmsg_level == IPPROTO_SCTP) &&
3353                     ((c_type == cmh.cmsg_type) ||
3354                     ((c_type == SCTP_SNDRCV) &&
3355                     ((cmh.cmsg_type == SCTP_SNDINFO) ||
3356                     (cmh.cmsg_type == SCTP_PRINFO) ||
3357                     (cmh.cmsg_type == SCTP_AUTHINFO))))) {
3358                         if (c_type == cmh.cmsg_type) {
3359                                 if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh))) < cpsize) {
3360                                         return (found);
3361                                 }
3362                                 /* It is exactly what we want. Copy it out. */
3363                                 m_copydata(control, at + CMSG_ALIGN(sizeof(cmh)), cpsize, (caddr_t)data);
3364                                 return (1);
3365                         } else {
3366                                 struct sctp_sndrcvinfo *sndrcvinfo;
3367
3368                                 sndrcvinfo = (struct sctp_sndrcvinfo *)data;
3369                                 if (found == 0) {
3370                                         if (cpsize < sizeof(struct sctp_sndrcvinfo)) {
3371                                                 return (found);
3372                                         }
3373                                         memset(sndrcvinfo, 0, sizeof(struct sctp_sndrcvinfo));
3374                                 }
3375                                 switch (cmh.cmsg_type) {
3376                                 case SCTP_SNDINFO:
3377                                         if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh))) < sizeof(struct sctp_sndinfo)) {
3378                                                 return (found);
3379                                         }
3380                                         m_copydata(control, at + CMSG_ALIGN(sizeof(cmh)), sizeof(struct sctp_sndinfo), (caddr_t)&sndinfo);
3381                                         sndrcvinfo->sinfo_stream = sndinfo.snd_sid;
3382                                         sndrcvinfo->sinfo_flags = sndinfo.snd_flags;
3383                                         sndrcvinfo->sinfo_ppid = sndinfo.snd_ppid;
3384                                         sndrcvinfo->sinfo_context = sndinfo.snd_context;
3385                                         sndrcvinfo->sinfo_assoc_id = sndinfo.snd_assoc_id;
3386                                         break;
3387                                 case SCTP_PRINFO:
3388                                         if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh))) < sizeof(struct sctp_prinfo)) {
3389                                                 return (found);
3390                                         }
3391                                         m_copydata(control, at + CMSG_ALIGN(sizeof(cmh)), sizeof(struct sctp_prinfo), (caddr_t)&prinfo);
3392                                         if (prinfo.pr_policy != SCTP_PR_SCTP_NONE) {
3393                                                 sndrcvinfo->sinfo_timetolive = prinfo.pr_value;
3394                                         } else {
3395                                                 sndrcvinfo->sinfo_timetolive = 0;
3396                                         }
3397                                         sndrcvinfo->sinfo_flags |= prinfo.pr_policy;
3398                                         break;
3399                                 case SCTP_AUTHINFO:
3400                                         if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh))) < sizeof(struct sctp_authinfo)) {
3401                                                 return (found);
3402                                         }
3403                                         m_copydata(control, at + CMSG_ALIGN(sizeof(cmh)), sizeof(struct sctp_authinfo), (caddr_t)&authinfo);
3404                                         sndrcvinfo->sinfo_keynumber_valid = 1;
3405                                         sndrcvinfo->sinfo_keynumber = authinfo.auth_keynumber;
3406                                         break;
3407                                 default:
3408                                         return (found);
3409                                 }
3410                                 found = 1;
3411                         }
3412                 }
3413                 at += CMSG_ALIGN(cmh.cmsg_len);
3414         }
3415         return (found);
3416 }
3417
3418 static int
3419 sctp_process_cmsgs_for_init(struct sctp_tcb *stcb, struct mbuf *control, int *error)
3420 {
3421         struct cmsghdr cmh;
3422         int tlen, at;
3423         struct sctp_initmsg initmsg;
3424
3425 #ifdef INET
3426         struct sockaddr_in sin;
3427
3428 #endif
3429 #ifdef INET6
3430         struct sockaddr_in6 sin6;
3431
3432 #endif
3433
3434         tlen = SCTP_BUF_LEN(control);
3435         at = 0;
3436         while (at < tlen) {
3437                 if ((tlen - at) < (int)CMSG_ALIGN(sizeof(cmh))) {
3438                         /* There is not enough room for one more. */
3439                         *error = EINVAL;
3440                         return (1);
3441                 }
3442                 m_copydata(control, at, sizeof(cmh), (caddr_t)&cmh);
3443                 if (cmh.cmsg_len < CMSG_ALIGN(sizeof(cmh))) {
3444                         /* We dont't have a complete CMSG header. */
3445                         *error = EINVAL;
3446                         return (1);
3447                 }
3448                 if (((int)cmh.cmsg_len + at) > tlen) {
3449                         /* We don't have the complete CMSG. */
3450                         *error = EINVAL;
3451                         return (1);
3452                 }
3453                 if (cmh.cmsg_level == IPPROTO_SCTP) {
3454                         switch (cmh.cmsg_type) {
3455                         case SCTP_INIT:
3456                                 if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh))) < sizeof(struct sctp_initmsg)) {
3457                                         *error = EINVAL;
3458                                         return (1);
3459                                 }
3460                                 m_copydata(control, at + CMSG_ALIGN(sizeof(cmh)), sizeof(struct sctp_initmsg), (caddr_t)&initmsg);
3461                                 if (initmsg.sinit_max_attempts)
3462                                         stcb->asoc.max_init_times = initmsg.sinit_max_attempts;
3463                                 if (initmsg.sinit_num_ostreams)
3464                                         stcb->asoc.pre_open_streams = initmsg.sinit_num_ostreams;
3465                                 if (initmsg.sinit_max_instreams)
3466                                         stcb->asoc.max_inbound_streams = initmsg.sinit_max_instreams;
3467                                 if (initmsg.sinit_max_init_timeo)
3468                                         stcb->asoc.initial_init_rto_max = initmsg.sinit_max_init_timeo;
3469                                 if (stcb->asoc.streamoutcnt < stcb->asoc.pre_open_streams) {
3470                                         struct sctp_stream_out *tmp_str;
3471                                         unsigned int i;
3472
3473                                         /* Default is NOT correct */
3474                                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Ok, default:%d pre_open:%d\n",
3475                                             stcb->asoc.streamoutcnt, stcb->asoc.pre_open_streams);
3476                                         SCTP_TCB_UNLOCK(stcb);
3477                                         SCTP_MALLOC(tmp_str,
3478                                             struct sctp_stream_out *,
3479                                             (stcb->asoc.pre_open_streams * sizeof(struct sctp_stream_out)),
3480                                             SCTP_M_STRMO);
3481                                         SCTP_TCB_LOCK(stcb);
3482                                         if (tmp_str != NULL) {
3483                                                 SCTP_FREE(stcb->asoc.strmout, SCTP_M_STRMO);
3484                                                 stcb->asoc.strmout = tmp_str;
3485                                                 stcb->asoc.strm_realoutsize = stcb->asoc.streamoutcnt = stcb->asoc.pre_open_streams;
3486                                         } else {
3487                                                 stcb->asoc.pre_open_streams = stcb->asoc.streamoutcnt;
3488                                         }
3489                                         for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
3490                                                 TAILQ_INIT(&stcb->asoc.strmout[i].outqueue);
3491                                                 stcb->asoc.strmout[i].chunks_on_queues = 0;
3492                                                 stcb->asoc.strmout[i].next_sequence_send = 0;
3493                                                 stcb->asoc.strmout[i].stream_no = i;
3494                                                 stcb->asoc.strmout[i].last_msg_incomplete = 0;
3495                                                 stcb->asoc.ss_functions.sctp_ss_init_stream(&stcb->asoc.strmout[i], NULL);
3496                                         }
3497                                 }
3498                                 break;
3499 #ifdef INET
3500                         case SCTP_DSTADDRV4:
3501                                 if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh))) < sizeof(struct in_addr)) {
3502                                         *error = EINVAL;
3503                                         return (1);
3504                                 }
3505                                 memset(&sin, 0, sizeof(struct sockaddr_in));
3506                                 sin.sin_family = AF_INET;
3507                                 sin.sin_len = sizeof(struct sockaddr_in);
3508                                 sin.sin_port = stcb->rport;
3509                                 m_copydata(control, at + CMSG_ALIGN(sizeof(cmh)), sizeof(struct in_addr), (caddr_t)&sin.sin_addr);
3510                                 if ((sin.sin_addr.s_addr == INADDR_ANY) ||
3511                                     (sin.sin_addr.s_addr == INADDR_BROADCAST) ||
3512                                     IN_MULTICAST(ntohl(sin.sin_addr.s_addr))) {
3513                                         *error = EINVAL;
3514                                         return (1);
3515                                 }
3516                                 if (sctp_add_remote_addr(stcb, (struct sockaddr *)&sin, NULL,
3517                                     SCTP_DONOT_SETSCOPE, SCTP_ADDR_IS_CONFIRMED)) {
3518                                         *error = ENOBUFS;
3519                                         return (1);
3520                                 }
3521                                 break;
3522 #endif
3523 #ifdef INET6
3524                         case SCTP_DSTADDRV6:
3525                                 if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh))) < sizeof(struct in6_addr)) {
3526                                         *error = EINVAL;
3527                                         return (1);
3528                                 }
3529                                 memset(&sin6, 0, sizeof(struct sockaddr_in6));
3530                                 sin6.sin6_family = AF_INET6;
3531                                 sin6.sin6_len = sizeof(struct sockaddr_in6);
3532                                 sin6.sin6_port = stcb->rport;
3533                                 m_copydata(control, at + CMSG_ALIGN(sizeof(cmh)), sizeof(struct in6_addr), (caddr_t)&sin6.sin6_addr);
3534                                 if (IN6_IS_ADDR_UNSPECIFIED(&sin6.sin6_addr) ||
3535                                     IN6_IS_ADDR_MULTICAST(&sin6.sin6_addr)) {
3536                                         *error = EINVAL;
3537                                         return (1);
3538                                 }
3539 #ifdef INET
3540                                 if (IN6_IS_ADDR_V4MAPPED(&sin6.sin6_addr)) {
3541                                         in6_sin6_2_sin(&sin, &sin6);
3542                                         if ((sin.sin_addr.s_addr == INADDR_ANY) ||
3543                                             (sin.sin_addr.s_addr == INADDR_BROADCAST) ||
3544                                             IN_MULTICAST(ntohl(sin.sin_addr.s_addr))) {
3545                                                 *error = EINVAL;
3546                                                 return (1);
3547                                         }
3548                                         if (sctp_add_remote_addr(stcb, (struct sockaddr *)&sin, NULL,
3549                                             SCTP_DONOT_SETSCOPE, SCTP_ADDR_IS_CONFIRMED)) {
3550                                                 *error = ENOBUFS;
3551                                                 return (1);
3552                                         }
3553                                 } else
3554 #endif
3555                                         if (sctp_add_remote_addr(stcb, (struct sockaddr *)&sin6, NULL,
3556                                     SCTP_DONOT_SETSCOPE, SCTP_ADDR_IS_CONFIRMED)) {
3557                                         *error = ENOBUFS;
3558                                         return (1);
3559                                 }
3560                                 break;
3561 #endif
3562                         default:
3563                                 break;
3564                         }
3565                 }
3566                 at += CMSG_ALIGN(cmh.cmsg_len);
3567         }
3568         return (0);
3569 }
3570
3571 static struct sctp_tcb *
3572 sctp_findassociation_cmsgs(struct sctp_inpcb **inp_p,
3573     uint16_t port,
3574     struct mbuf *control,
3575     struct sctp_nets **net_p,
3576     int *error)
3577 {
3578         struct cmsghdr cmh;
3579         int tlen, at;
3580         struct sctp_tcb *stcb;
3581         struct sockaddr *addr;
3582
3583 #ifdef INET
3584         struct sockaddr_in sin;
3585
3586 #endif
3587 #ifdef INET6
3588         struct sockaddr_in6 sin6;
3589
3590 #endif
3591
3592         tlen = SCTP_BUF_LEN(control);
3593         at = 0;
3594         while (at < tlen) {
3595                 if ((tlen - at) < (int)CMSG_ALIGN(sizeof(cmh))) {
3596                         /* There is not enough room for one more. */
3597                         *error = EINVAL;
3598                         return (NULL);
3599                 }
3600                 m_copydata(control, at, sizeof(cmh), (caddr_t)&cmh);
3601                 if (cmh.cmsg_len < CMSG_ALIGN(sizeof(cmh))) {
3602                         /* We dont't have a complete CMSG header. */
3603                         *error = EINVAL;
3604                         return (NULL);
3605                 }
3606                 if (((int)cmh.cmsg_len + at) > tlen) {
3607                         /* We don't have the complete CMSG. */
3608                         *error = EINVAL;
3609                         return (NULL);
3610                 }
3611                 if (cmh.cmsg_level == IPPROTO_SCTP) {
3612                         switch (cmh.cmsg_type) {
3613 #ifdef INET
3614                         case SCTP_DSTADDRV4:
3615                                 if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh))) < sizeof(struct in_addr)) {
3616                                         *error = EINVAL;
3617                                         return (NULL);
3618                                 }
3619                                 memset(&sin, 0, sizeof(struct sockaddr_in));
3620                                 sin.sin_family = AF_INET;
3621                                 sin.sin_len = sizeof(struct sockaddr_in);
3622                                 sin.sin_port = port;
3623                                 m_copydata(control, at + CMSG_ALIGN(sizeof(cmh)), sizeof(struct in_addr), (caddr_t)&sin.sin_addr);
3624                                 addr = (struct sockaddr *)&sin;
3625                                 break;
3626 #endif
3627 #ifdef INET6
3628                         case SCTP_DSTADDRV6:
3629                                 if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh))) < sizeof(struct in6_addr)) {
3630                                         *error = EINVAL;
3631                                         return (NULL);
3632                                 }
3633                                 memset(&sin6, 0, sizeof(struct sockaddr_in6));
3634                                 sin6.sin6_family = AF_INET6;
3635                                 sin6.sin6_len = sizeof(struct sockaddr_in6);
3636                                 sin6.sin6_port = port;
3637                                 m_copydata(control, at + CMSG_ALIGN(sizeof(cmh)), sizeof(struct in6_addr), (caddr_t)&sin6.sin6_addr);
3638 #ifdef INET
3639                                 if (IN6_IS_ADDR_V4MAPPED(&sin6.sin6_addr)) {
3640                                         in6_sin6_2_sin(&sin, &sin6);
3641                                         addr = (struct sockaddr *)&sin;
3642                                 } else
3643 #endif
3644                                         addr = (struct sockaddr *)&sin6;
3645                                 break;
3646 #endif
3647                         default:
3648                                 addr = NULL;
3649                                 break;
3650                         }
3651                         if (addr) {
3652                                 stcb = sctp_findassociation_ep_addr(inp_p, addr, net_p, NULL, NULL);
3653                                 if (stcb != NULL) {
3654                                         return (stcb);
3655                                 }
3656                         }
3657                 }
3658                 at += CMSG_ALIGN(cmh.cmsg_len);
3659         }
3660         return (NULL);
3661 }
3662
3663 static struct mbuf *
3664 sctp_add_cookie(struct mbuf *init, int init_offset,
3665     struct mbuf *initack, int initack_offset, struct sctp_state_cookie *stc_in, uint8_t ** signature)
3666 {
3667         struct mbuf *copy_init, *copy_initack, *m_at, *sig, *mret;
3668         struct sctp_state_cookie *stc;
3669         struct sctp_paramhdr *ph;
3670         uint8_t *foo;
3671         int sig_offset;
3672         uint16_t cookie_sz;
3673
3674         mret = NULL;
3675         mret = sctp_get_mbuf_for_msg((sizeof(struct sctp_state_cookie) +
3676             sizeof(struct sctp_paramhdr)), 0,
3677             M_NOWAIT, 1, MT_DATA);
3678         if (mret == NULL) {
3679                 return (NULL);
3680         }
3681         copy_init = SCTP_M_COPYM(init, init_offset, M_COPYALL, M_NOWAIT);
3682         if (copy_init == NULL) {
3683                 sctp_m_freem(mret);
3684                 return (NULL);
3685         }
3686 #ifdef SCTP_MBUF_LOGGING
3687         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
3688                 struct mbuf *mat;
3689
3690                 for (mat = copy_init; mat; mat = SCTP_BUF_NEXT(mat)) {
3691                         if (SCTP_BUF_IS_EXTENDED(mat)) {
3692                                 sctp_log_mb(mat, SCTP_MBUF_ICOPY);
3693                         }
3694                 }
3695         }
3696 #endif
3697         copy_initack = SCTP_M_COPYM(initack, initack_offset, M_COPYALL,
3698             M_NOWAIT);
3699         if (copy_initack == NULL) {
3700                 sctp_m_freem(mret);
3701                 sctp_m_freem(copy_init);
3702                 return (NULL);
3703         }
3704 #ifdef SCTP_MBUF_LOGGING
3705         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
3706                 struct mbuf *mat;
3707
3708                 for (mat = copy_initack; mat; mat = SCTP_BUF_NEXT(mat)) {
3709                         if (SCTP_BUF_IS_EXTENDED(mat)) {
3710                                 sctp_log_mb(mat, SCTP_MBUF_ICOPY);
3711                         }
3712                 }
3713         }
3714 #endif
3715         /* easy side we just drop it on the end */
3716         ph = mtod(mret, struct sctp_paramhdr *);
3717         SCTP_BUF_LEN(mret) = sizeof(struct sctp_state_cookie) +
3718             sizeof(struct sctp_paramhdr);
3719         stc = (struct sctp_state_cookie *)((caddr_t)ph +
3720             sizeof(struct sctp_paramhdr));
3721         ph->param_type = htons(SCTP_STATE_COOKIE);
3722         ph->param_length = 0;   /* fill in at the end */
3723         /* Fill in the stc cookie data */
3724         memcpy(stc, stc_in, sizeof(struct sctp_state_cookie));
3725
3726         /* tack the INIT and then the INIT-ACK onto the chain */
3727         cookie_sz = 0;
3728         for (m_at = mret; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
3729                 cookie_sz += SCTP_BUF_LEN(m_at);
3730                 if (SCTP_BUF_NEXT(m_at) == NULL) {
3731                         SCTP_BUF_NEXT(m_at) = copy_init;
3732                         break;
3733                 }
3734         }
3735         for (m_at = copy_init; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
3736                 cookie_sz += SCTP_BUF_LEN(m_at);
3737                 if (SCTP_BUF_NEXT(m_at) == NULL) {
3738                         SCTP_BUF_NEXT(m_at) = copy_initack;
3739                         break;
3740                 }
3741         }
3742         for (m_at = copy_initack; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
3743                 cookie_sz += SCTP_BUF_LEN(m_at);
3744                 if (SCTP_BUF_NEXT(m_at) == NULL) {
3745                         break;
3746                 }
3747         }
3748         sig = sctp_get_mbuf_for_msg(SCTP_SECRET_SIZE, 0, M_NOWAIT, 1, MT_DATA);
3749         if (sig == NULL) {
3750                 /* no space, so free the entire chain */
3751                 sctp_m_freem(mret);
3752                 return (NULL);
3753         }
3754         SCTP_BUF_LEN(sig) = 0;
3755         SCTP_BUF_NEXT(m_at) = sig;
3756         sig_offset = 0;
3757         foo = (uint8_t *) (mtod(sig, caddr_t)+sig_offset);
3758         memset(foo, 0, SCTP_SIGNATURE_SIZE);
3759         *signature = foo;
3760         SCTP_BUF_LEN(sig) += SCTP_SIGNATURE_SIZE;
3761         cookie_sz += SCTP_SIGNATURE_SIZE;
3762         ph->param_length = htons(cookie_sz);
3763         return (mret);
3764 }
3765
3766
3767 static uint8_t
3768 sctp_get_ect(struct sctp_tcb *stcb)
3769 {
3770         if ((stcb != NULL) && (stcb->asoc.ecn_allowed == 1)) {
3771                 return (SCTP_ECT0_BIT);
3772         } else {
3773                 return (0);
3774         }
3775 }
3776
3777 #if defined(INET) || defined(INET6)
3778 static void
3779 sctp_handle_no_route(struct sctp_tcb *stcb,
3780     struct sctp_nets *net,
3781     int so_locked)
3782 {
3783         SCTPDBG(SCTP_DEBUG_OUTPUT1, "dropped packet - no valid source addr\n");
3784
3785         if (net) {
3786                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Destination was ");
3787                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT1, &net->ro._l_addr.sa);
3788                 if (net->dest_state & SCTP_ADDR_CONFIRMED) {
3789                         if ((net->dest_state & SCTP_ADDR_REACHABLE) && stcb) {
3790                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "no route takes interface %p down\n", (void *)net);
3791                                 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_DOWN,
3792                                     stcb, 0,
3793                                     (void *)net,
3794                                     so_locked);
3795                                 net->dest_state &= ~SCTP_ADDR_REACHABLE;
3796                                 net->dest_state &= ~SCTP_ADDR_PF;
3797                         }
3798                 }
3799                 if (stcb) {
3800                         if (net == stcb->asoc.primary_destination) {
3801                                 /* need a new primary */
3802                                 struct sctp_nets *alt;
3803
3804                                 alt = sctp_find_alternate_net(stcb, net, 0);
3805                                 if (alt != net) {
3806                                         if (stcb->asoc.alternate) {
3807                                                 sctp_free_remote_addr(stcb->asoc.alternate);
3808                                         }
3809                                         stcb->asoc.alternate = alt;
3810                                         atomic_add_int(&stcb->asoc.alternate->ref_count, 1);
3811                                         if (net->ro._s_addr) {
3812                                                 sctp_free_ifa(net->ro._s_addr);
3813                                                 net->ro._s_addr = NULL;
3814                                         }
3815                                         net->src_addr_selected = 0;
3816                                 }
3817                         }
3818                 }
3819         }
3820 }
3821
3822 #endif
3823
3824 static int
3825 sctp_lowlevel_chunk_output(struct sctp_inpcb *inp,
3826     struct sctp_tcb *stcb,      /* may be NULL */
3827     struct sctp_nets *net,
3828     struct sockaddr *to,
3829     struct mbuf *m,
3830     uint32_t auth_offset,
3831     struct sctp_auth_chunk *auth,
3832     uint16_t auth_keyid,
3833     int nofragment_flag,
3834     int ecn_ok,
3835     int out_of_asoc_ok,
3836     uint16_t src_port,
3837     uint16_t dest_port,
3838     uint32_t v_tag,
3839     uint16_t port,
3840     union sctp_sockstore *over_addr,
3841     uint8_t use_mflowid, uint32_t mflowid,
3842 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
3843     int so_locked SCTP_UNUSED
3844 #else
3845     int so_locked
3846 #endif
3847 )
3848 /* nofragment_flag to tell if IP_DF should be set (IPv4 only) */
3849 {
3850         /**
3851          * Given a mbuf chain (via SCTP_BUF_NEXT()) that holds a packet header
3852          * WITH an SCTPHDR but no IP header, endpoint inp and sa structure:
3853          * - fill in the HMAC digest of any AUTH chunk in the packet.
3854          * - calculate and fill in the SCTP checksum.
3855          * - prepend an IP address header.
3856          * - if boundall use INADDR_ANY.
3857          * - if boundspecific do source address selection.
3858          * - set fragmentation option for ipV4.
3859          * - On return from IP output, check/adjust mtu size of output
3860          *   interface and smallest_mtu size as well.
3861          */
3862         /* Will need ifdefs around this */
3863         struct mbuf *newm;
3864         struct sctphdr *sctphdr;
3865         int packet_length;
3866         int ret;
3867
3868 #if defined(INET) || defined(INET6)
3869         uint32_t vrf_id;
3870
3871 #endif
3872 #if defined(INET) || defined(INET6)
3873         struct mbuf *o_pak;
3874         sctp_route_t *ro = NULL;
3875         struct udphdr *udp = NULL;
3876
3877 #endif
3878         uint8_t tos_value;
3879
3880 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
3881         struct socket *so = NULL;
3882
3883 #endif
3884
3885         if ((net) && (net->dest_state & SCTP_ADDR_OUT_OF_SCOPE)) {
3886                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EFAULT);
3887                 sctp_m_freem(m);
3888                 return (EFAULT);
3889         }
3890 #if defined(INET) || defined(INET6)
3891         if (stcb) {
3892                 vrf_id = stcb->asoc.vrf_id;
3893         } else {
3894                 vrf_id = inp->def_vrf_id;
3895         }
3896 #endif
3897         /* fill in the HMAC digest for any AUTH chunk in the packet */
3898         if ((auth != NULL) && (stcb != NULL)) {
3899                 sctp_fill_hmac_digest_m(m, auth_offset, auth, stcb, auth_keyid);
3900         }
3901         if (net) {
3902                 tos_value = net->dscp;
3903         } else if (stcb) {
3904                 tos_value = stcb->asoc.default_dscp;
3905         } else {
3906                 tos_value = inp->sctp_ep.default_dscp;
3907         }
3908
3909         switch (to->sa_family) {
3910 #ifdef INET
3911         case AF_INET:
3912                 {
3913                         struct ip *ip = NULL;
3914                         sctp_route_t iproute;
3915                         int len;
3916
3917                         len = sizeof(struct ip) + sizeof(struct sctphdr);
3918                         if (port) {
3919                                 len += sizeof(struct udphdr);
3920                         }
3921                         newm = sctp_get_mbuf_for_msg(len, 1, M_NOWAIT, 1, MT_DATA);
3922                         if (newm == NULL) {
3923                                 sctp_m_freem(m);
3924                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
3925                                 return (ENOMEM);
3926                         }
3927                         SCTP_ALIGN_TO_END(newm, len);
3928                         SCTP_BUF_LEN(newm) = len;
3929                         SCTP_BUF_NEXT(newm) = m;
3930                         m = newm;
3931                         if (net != NULL) {
3932 #ifdef INVARIANTS
3933                                 if (net->flowidset == 0) {
3934                                         panic("Flow ID not set");
3935                                 }
3936 #endif
3937                                 m->m_pkthdr.flowid = net->flowid;
3938                                 m->m_flags |= M_FLOWID;
3939                         } else {
3940                                 if (use_mflowid != 0) {
3941                                         m->m_pkthdr.flowid = mflowid;
3942                                         m->m_flags |= M_FLOWID;
3943                                 }
3944                         }
3945                         packet_length = sctp_calculate_len(m);
3946                         ip = mtod(m, struct ip *);
3947                         ip->ip_v = IPVERSION;
3948                         ip->ip_hl = (sizeof(struct ip) >> 2);
3949                         if (tos_value == 0) {
3950                                 /*
3951                                  * This means especially, that it is not set
3952                                  * at the SCTP layer. So use the value from
3953                                  * the IP layer.
3954                                  */
3955                                 tos_value = inp->ip_inp.inp.inp_ip_tos;
3956                         }
3957                         tos_value &= 0xfc;
3958                         if (ecn_ok) {
3959                                 tos_value |= sctp_get_ect(stcb);
3960                         }
3961                         if ((nofragment_flag) && (port == 0)) {
3962                                 ip->ip_off = htons(IP_DF);
3963                         } else {
3964                                 ip->ip_off = htons(0);
3965                         }
3966                         /* FreeBSD has a function for ip_id's */
3967                         ip->ip_id = ip_newid();
3968
3969                         ip->ip_ttl = inp->ip_inp.inp.inp_ip_ttl;
3970                         ip->ip_len = htons(packet_length);
3971                         ip->ip_tos = tos_value;
3972                         if (port) {
3973                                 ip->ip_p = IPPROTO_UDP;
3974                         } else {
3975                                 ip->ip_p = IPPROTO_SCTP;
3976                         }
3977                         ip->ip_sum = 0;
3978                         if (net == NULL) {
3979                                 ro = &iproute;
3980                                 memset(&iproute, 0, sizeof(iproute));
3981                                 memcpy(&ro->ro_dst, to, to->sa_len);
3982                         } else {
3983                                 ro = (sctp_route_t *) & net->ro;
3984                         }
3985                         /* Now the address selection part */
3986                         ip->ip_dst.s_addr = ((struct sockaddr_in *)to)->sin_addr.s_addr;
3987
3988                         /* call the routine to select the src address */
3989                         if (net && out_of_asoc_ok == 0) {
3990                                 if (net->ro._s_addr && (net->ro._s_addr->localifa_flags & (SCTP_BEING_DELETED | SCTP_ADDR_IFA_UNUSEABLE))) {
3991                                         sctp_free_ifa(net->ro._s_addr);
3992                                         net->ro._s_addr = NULL;
3993                                         net->src_addr_selected = 0;
3994                                         if (ro->ro_rt) {
3995                                                 RTFREE(ro->ro_rt);
3996                                                 ro->ro_rt = NULL;
3997                                         }
3998                                 }
3999                                 if (net->src_addr_selected == 0) {
4000                                         /* Cache the source address */
4001                                         net->ro._s_addr = sctp_source_address_selection(inp, stcb,
4002                                             ro, net, 0,
4003                                             vrf_id);
4004                                         net->src_addr_selected = 1;
4005                                 }
4006                                 if (net->ro._s_addr == NULL) {
4007                                         /* No route to host */
4008                                         net->src_addr_selected = 0;
4009                                         sctp_handle_no_route(stcb, net, so_locked);
4010                                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4011                                         sctp_m_freem(m);
4012                                         return (EHOSTUNREACH);
4013                                 }
4014                                 ip->ip_src = net->ro._s_addr->address.sin.sin_addr;
4015                         } else {
4016                                 if (over_addr == NULL) {
4017                                         struct sctp_ifa *_lsrc;
4018
4019                                         _lsrc = sctp_source_address_selection(inp, stcb, ro,
4020                                             net,
4021                                             out_of_asoc_ok,
4022                                             vrf_id);
4023                                         if (_lsrc == NULL) {
4024                                                 sctp_handle_no_route(stcb, net, so_locked);
4025                                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4026                                                 sctp_m_freem(m);
4027                                                 return (EHOSTUNREACH);
4028                                         }
4029                                         ip->ip_src = _lsrc->address.sin.sin_addr;
4030                                         sctp_free_ifa(_lsrc);
4031                                 } else {
4032                                         ip->ip_src = over_addr->sin.sin_addr;
4033                                         SCTP_RTALLOC(ro, vrf_id);
4034                                 }
4035                         }
4036                         if (port) {
4037                                 if (htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port)) == 0) {
4038                                         sctp_handle_no_route(stcb, net, so_locked);
4039                                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4040                                         sctp_m_freem(m);
4041                                         return (EHOSTUNREACH);
4042                                 }
4043                                 udp = (struct udphdr *)((caddr_t)ip + sizeof(struct ip));
4044                                 udp->uh_sport = htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port));
4045                                 udp->uh_dport = port;
4046                                 udp->uh_ulen = htons(packet_length - sizeof(struct ip));
4047                                 if (V_udp_cksum) {
4048                                         udp->uh_sum = in_pseudo(ip->ip_src.s_addr, ip->ip_dst.s_addr, udp->uh_ulen + htons(IPPROTO_UDP));
4049                                 } else {
4050                                         udp->uh_sum = 0;
4051                                 }
4052                                 sctphdr = (struct sctphdr *)((caddr_t)udp + sizeof(struct udphdr));
4053                         } else {
4054                                 sctphdr = (struct sctphdr *)((caddr_t)ip + sizeof(struct ip));
4055                         }
4056
4057                         sctphdr->src_port = src_port;
4058                         sctphdr->dest_port = dest_port;
4059                         sctphdr->v_tag = v_tag;
4060                         sctphdr->checksum = 0;
4061
4062                         /*
4063                          * If source address selection fails and we find no
4064                          * route then the ip_output should fail as well with
4065                          * a NO_ROUTE_TO_HOST type error. We probably should
4066                          * catch that somewhere and abort the association
4067                          * right away (assuming this is an INIT being sent).
4068                          */
4069                         if (ro->ro_rt == NULL) {
4070                                 /*
4071                                  * src addr selection failed to find a route
4072                                  * (or valid source addr), so we can't get
4073                                  * there from here (yet)!
4074                                  */
4075                                 sctp_handle_no_route(stcb, net, so_locked);
4076                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4077                                 sctp_m_freem(m);
4078                                 return (EHOSTUNREACH);
4079                         }
4080                         if (ro != &iproute) {
4081                                 memcpy(&iproute, ro, sizeof(*ro));
4082                         }
4083                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "Calling ipv4 output routine from low level src addr:%x\n",
4084                             (uint32_t) (ntohl(ip->ip_src.s_addr)));
4085                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "Destination is %x\n",
4086                             (uint32_t) (ntohl(ip->ip_dst.s_addr)));
4087                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "RTP route is %p through\n",
4088                             (void *)ro->ro_rt);
4089
4090                         if (SCTP_GET_HEADER_FOR_OUTPUT(o_pak)) {
4091                                 /* failed to prepend data, give up */
4092                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
4093                                 sctp_m_freem(m);
4094                                 return (ENOMEM);
4095                         }
4096                         SCTP_ATTACH_CHAIN(o_pak, m, packet_length);
4097                         if (port) {
4098 #if defined(SCTP_WITH_NO_CSUM)
4099                                 SCTP_STAT_INCR(sctps_sendnocrc);
4100 #else
4101                                 sctphdr->checksum = sctp_calculate_cksum(m, sizeof(struct ip) + sizeof(struct udphdr));
4102                                 SCTP_STAT_INCR(sctps_sendswcrc);
4103 #endif
4104                                 if (V_udp_cksum) {
4105                                         SCTP_ENABLE_UDP_CSUM(o_pak);
4106                                 }
4107                         } else {
4108 #if defined(SCTP_WITH_NO_CSUM)
4109                                 SCTP_STAT_INCR(sctps_sendnocrc);
4110 #else
4111                                 m->m_pkthdr.csum_flags = CSUM_SCTP;
4112                                 m->m_pkthdr.csum_data = 0;
4113                                 SCTP_STAT_INCR(sctps_sendhwcrc);
4114 #endif
4115                         }
4116 #ifdef SCTP_PACKET_LOGGING
4117                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING)
4118                                 sctp_packet_log(o_pak);
4119 #endif
4120                         /* send it out.  table id is taken from stcb */
4121 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4122                         if ((SCTP_BASE_SYSCTL(sctp_output_unlocked)) && (so_locked)) {
4123                                 so = SCTP_INP_SO(inp);
4124                                 SCTP_SOCKET_UNLOCK(so, 0);
4125                         }
4126 #endif
4127                         SCTP_IP_OUTPUT(ret, o_pak, ro, stcb, vrf_id);
4128 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4129                         if ((SCTP_BASE_SYSCTL(sctp_output_unlocked)) && (so_locked)) {
4130                                 atomic_add_int(&stcb->asoc.refcnt, 1);
4131                                 SCTP_TCB_UNLOCK(stcb);
4132                                 SCTP_SOCKET_LOCK(so, 0);
4133                                 SCTP_TCB_LOCK(stcb);
4134                                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
4135                         }
4136 #endif
4137                         SCTP_STAT_INCR(sctps_sendpackets);
4138                         SCTP_STAT_INCR_COUNTER64(sctps_outpackets);
4139                         if (ret)
4140                                 SCTP_STAT_INCR(sctps_senderrors);
4141
4142                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "IP output returns %d\n", ret);
4143                         if (net == NULL) {
4144                                 /* free tempy routes */
4145                                 RO_RTFREE(ro);
4146                         } else {
4147                                 /*
4148                                  * PMTU check versus smallest asoc MTU goes
4149                                  * here
4150                                  */
4151                                 if ((ro->ro_rt != NULL) &&
4152                                     (net->ro._s_addr)) {
4153                                         uint32_t mtu;
4154
4155                                         mtu = SCTP_GATHER_MTU_FROM_ROUTE(net->ro._s_addr, &net->ro._l_addr.sa, ro->ro_rt);
4156                                         if (net->port) {
4157                                                 mtu -= sizeof(struct udphdr);
4158                                         }
4159                                         if (mtu && (stcb->asoc.smallest_mtu > mtu)) {
4160                                                 sctp_mtu_size_reset(inp, &stcb->asoc, mtu);
4161                                                 net->mtu = mtu;
4162                                         }
4163                                 } else if (ro->ro_rt == NULL) {
4164                                         /* route was freed */
4165                                         if (net->ro._s_addr &&
4166                                             net->src_addr_selected) {
4167                                                 sctp_free_ifa(net->ro._s_addr);
4168                                                 net->ro._s_addr = NULL;
4169                                         }
4170                                         net->src_addr_selected = 0;
4171                                 }
4172                         }
4173                         return (ret);
4174                 }
4175 #endif
4176 #ifdef INET6
4177         case AF_INET6:
4178                 {
4179                         uint32_t flowlabel, flowinfo;
4180                         struct ip6_hdr *ip6h;
4181                         struct route_in6 ip6route;
4182                         struct ifnet *ifp;
4183                         struct sockaddr_in6 *sin6, tmp, *lsa6, lsa6_tmp;
4184                         int prev_scope = 0;
4185                         struct sockaddr_in6 lsa6_storage;
4186                         int error;
4187                         u_short prev_port = 0;
4188                         int len;
4189
4190                         if (net) {
4191                                 flowlabel = net->flowlabel;
4192                         } else if (stcb) {
4193                                 flowlabel = stcb->asoc.default_flowlabel;
4194                         } else {
4195                                 flowlabel = inp->sctp_ep.default_flowlabel;
4196                         }
4197                         if (flowlabel == 0) {
4198                                 /*
4199                                  * This means especially, that it is not set
4200                                  * at the SCTP layer. So use the value from
4201                                  * the IP layer.
4202                                  */
4203                                 flowlabel = ntohl(((struct in6pcb *)inp)->in6p_flowinfo);
4204                         }
4205                         flowlabel &= 0x000fffff;
4206                         len = sizeof(struct ip6_hdr) + sizeof(struct sctphdr);
4207                         if (port) {
4208                                 len += sizeof(struct udphdr);
4209                         }
4210                         newm = sctp_get_mbuf_for_msg(len, 1, M_NOWAIT, 1, MT_DATA);
4211                         if (newm == NULL) {
4212                                 sctp_m_freem(m);
4213                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
4214                                 return (ENOMEM);
4215                         }
4216                         SCTP_ALIGN_TO_END(newm, len);
4217                         SCTP_BUF_LEN(newm) = len;
4218                         SCTP_BUF_NEXT(newm) = m;
4219                         m = newm;
4220                         if (net != NULL) {
4221 #ifdef INVARIANTS
4222                                 if (net->flowidset == 0) {
4223                                         panic("Flow ID not set");
4224                                 }
4225 #endif
4226                                 m->m_pkthdr.flowid = net->flowid;
4227                                 m->m_flags |= M_FLOWID;
4228                         } else {
4229                                 if (use_mflowid != 0) {
4230                                         m->m_pkthdr.flowid = mflowid;
4231                                         m->m_flags |= M_FLOWID;
4232                                 }
4233                         }
4234                         packet_length = sctp_calculate_len(m);
4235
4236                         ip6h = mtod(m, struct ip6_hdr *);
4237                         /* protect *sin6 from overwrite */
4238                         sin6 = (struct sockaddr_in6 *)to;
4239                         tmp = *sin6;
4240                         sin6 = &tmp;
4241
4242                         /* KAME hack: embed scopeid */
4243                         if (sa6_embedscope(sin6, MODULE_GLOBAL(ip6_use_defzone)) != 0) {
4244                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
4245                                 return (EINVAL);
4246                         }
4247                         if (net == NULL) {
4248                                 memset(&ip6route, 0, sizeof(ip6route));
4249                                 ro = (sctp_route_t *) & ip6route;
4250                                 memcpy(&ro->ro_dst, sin6, sin6->sin6_len);
4251                         } else {
4252                                 ro = (sctp_route_t *) & net->ro;
4253                         }
4254                         /*
4255                          * We assume here that inp_flow is in host byte
4256                          * order within the TCB!
4257                          */
4258                         if (tos_value == 0) {
4259                                 /*
4260                                  * This means especially, that it is not set
4261                                  * at the SCTP layer. So use the value from
4262                                  * the IP layer.
4263                                  */
4264                                 tos_value = (ntohl(((struct in6pcb *)inp)->in6p_flowinfo) >> 20) & 0xff;
4265                         }
4266                         tos_value &= 0xfc;
4267                         if (ecn_ok) {
4268                                 tos_value |= sctp_get_ect(stcb);
4269                         }
4270                         flowinfo = 0x06;
4271                         flowinfo <<= 8;
4272                         flowinfo |= tos_value;
4273                         flowinfo <<= 20;
4274                         flowinfo |= flowlabel;
4275                         ip6h->ip6_flow = htonl(flowinfo);
4276                         if (port) {
4277                                 ip6h->ip6_nxt = IPPROTO_UDP;
4278                         } else {
4279                                 ip6h->ip6_nxt = IPPROTO_SCTP;
4280                         }
4281                         ip6h->ip6_plen = (packet_length - sizeof(struct ip6_hdr));
4282                         ip6h->ip6_dst = sin6->sin6_addr;
4283
4284                         /*
4285                          * Add SRC address selection here: we can only reuse
4286                          * to a limited degree the kame src-addr-sel, since
4287                          * we can try their selection but it may not be
4288                          * bound.
4289                          */
4290                         bzero(&lsa6_tmp, sizeof(lsa6_tmp));
4291                         lsa6_tmp.sin6_family = AF_INET6;
4292                         lsa6_tmp.sin6_len = sizeof(lsa6_tmp);
4293                         lsa6 = &lsa6_tmp;
4294                         if (net && out_of_asoc_ok == 0) {
4295                                 if (net->ro._s_addr && (net->ro._s_addr->localifa_flags & (SCTP_BEING_DELETED | SCTP_ADDR_IFA_UNUSEABLE))) {
4296                                         sctp_free_ifa(net->ro._s_addr);
4297                                         net->ro._s_addr = NULL;
4298                                         net->src_addr_selected = 0;
4299                                         if (ro->ro_rt) {
4300                                                 RTFREE(ro->ro_rt);
4301                                                 ro->ro_rt = NULL;
4302                                         }
4303                                 }
4304                                 if (net->src_addr_selected == 0) {
4305                                         sin6 = (struct sockaddr_in6 *)&net->ro._l_addr;
4306                                         /* KAME hack: embed scopeid */
4307                                         if (sa6_embedscope(sin6, MODULE_GLOBAL(ip6_use_defzone)) != 0) {
4308                                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
4309                                                 return (EINVAL);
4310                                         }
4311                                         /* Cache the source address */
4312                                         net->ro._s_addr = sctp_source_address_selection(inp,
4313                                             stcb,
4314                                             ro,
4315                                             net,
4316                                             0,
4317                                             vrf_id);
4318                                         (void)sa6_recoverscope(sin6);
4319                                         net->src_addr_selected = 1;
4320                                 }
4321                                 if (net->ro._s_addr == NULL) {
4322                                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "V6:No route to host\n");
4323                                         net->src_addr_selected = 0;
4324                                         sctp_handle_no_route(stcb, net, so_locked);
4325                                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4326                                         sctp_m_freem(m);
4327                                         return (EHOSTUNREACH);
4328                                 }
4329                                 lsa6->sin6_addr = net->ro._s_addr->address.sin6.sin6_addr;
4330                         } else {
4331                                 sin6 = (struct sockaddr_in6 *)&ro->ro_dst;
4332                                 /* KAME hack: embed scopeid */
4333                                 if (sa6_embedscope(sin6, MODULE_GLOBAL(ip6_use_defzone)) != 0) {
4334                                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
4335                                         return (EINVAL);
4336                                 }
4337                                 if (over_addr == NULL) {
4338                                         struct sctp_ifa *_lsrc;
4339
4340                                         _lsrc = sctp_source_address_selection(inp, stcb, ro,
4341                                             net,
4342                                             out_of_asoc_ok,
4343                                             vrf_id);
4344                                         if (_lsrc == NULL) {
4345                                                 sctp_handle_no_route(stcb, net, so_locked);
4346                                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4347                                                 sctp_m_freem(m);
4348                                                 return (EHOSTUNREACH);
4349                                         }
4350                                         lsa6->sin6_addr = _lsrc->address.sin6.sin6_addr;
4351                                         sctp_free_ifa(_lsrc);
4352                                 } else {
4353                                         lsa6->sin6_addr = over_addr->sin6.sin6_addr;
4354                                         SCTP_RTALLOC(ro, vrf_id);
4355                                 }
4356                                 (void)sa6_recoverscope(sin6);
4357                         }
4358                         lsa6->sin6_port = inp->sctp_lport;
4359
4360                         if (ro->ro_rt == NULL) {
4361                                 /*
4362                                  * src addr selection failed to find a route
4363                                  * (or valid source addr), so we can't get
4364                                  * there from here!
4365                                  */
4366                                 sctp_handle_no_route(stcb, net, so_locked);
4367                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4368                                 sctp_m_freem(m);
4369                                 return (EHOSTUNREACH);
4370                         }
4371                         /*
4372                          * XXX: sa6 may not have a valid sin6_scope_id in
4373                          * the non-SCOPEDROUTING case.
4374                          */
4375                         bzero(&lsa6_storage, sizeof(lsa6_storage));
4376                         lsa6_storage.sin6_family = AF_INET6;
4377                         lsa6_storage.sin6_len = sizeof(lsa6_storage);
4378                         lsa6_storage.sin6_addr = lsa6->sin6_addr;
4379                         if ((error = sa6_recoverscope(&lsa6_storage)) != 0) {
4380                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "recover scope fails error %d\n", error);
4381                                 sctp_m_freem(m);
4382                                 return (error);
4383                         }
4384                         /* XXX */
4385                         lsa6_storage.sin6_addr = lsa6->sin6_addr;
4386                         lsa6_storage.sin6_port = inp->sctp_lport;
4387                         lsa6 = &lsa6_storage;
4388                         ip6h->ip6_src = lsa6->sin6_addr;
4389
4390                         if (port) {
4391                                 if (htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port)) == 0) {
4392                                         sctp_handle_no_route(stcb, net, so_locked);
4393                                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4394                                         sctp_m_freem(m);
4395                                         return (EHOSTUNREACH);
4396                                 }
4397                                 udp = (struct udphdr *)((caddr_t)ip6h + sizeof(struct ip6_hdr));
4398                                 udp->uh_sport = htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port));
4399                                 udp->uh_dport = port;
4400                                 udp->uh_ulen = htons(packet_length - sizeof(struct ip6_hdr));
4401                                 udp->uh_sum = 0;
4402                                 sctphdr = (struct sctphdr *)((caddr_t)udp + sizeof(struct udphdr));
4403                         } else {
4404                                 sctphdr = (struct sctphdr *)((caddr_t)ip6h + sizeof(struct ip6_hdr));
4405                         }
4406
4407                         sctphdr->src_port = src_port;
4408                         sctphdr->dest_port = dest_port;
4409                         sctphdr->v_tag = v_tag;
4410                         sctphdr->checksum = 0;
4411
4412                         /*
4413                          * We set the hop limit now since there is a good
4414                          * chance that our ro pointer is now filled
4415                          */
4416                         ip6h->ip6_hlim = SCTP_GET_HLIM(inp, ro);
4417                         ifp = SCTP_GET_IFN_VOID_FROM_ROUTE(ro);
4418
4419 #ifdef SCTP_DEBUG
4420                         /* Copy to be sure something bad is not happening */
4421                         sin6->sin6_addr = ip6h->ip6_dst;
4422                         lsa6->sin6_addr = ip6h->ip6_src;
4423 #endif
4424
4425                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "Calling ipv6 output routine from low level\n");
4426                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "src: ");
4427                         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT3, (struct sockaddr *)lsa6);
4428                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "dst: ");
4429                         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT3, (struct sockaddr *)sin6);
4430                         if (net) {
4431                                 sin6 = (struct sockaddr_in6 *)&net->ro._l_addr;
4432                                 /*
4433                                  * preserve the port and scope for link
4434                                  * local send
4435                                  */
4436                                 prev_scope = sin6->sin6_scope_id;
4437                                 prev_port = sin6->sin6_port;
4438                         }
4439                         if (SCTP_GET_HEADER_FOR_OUTPUT(o_pak)) {
4440                                 /* failed to prepend data, give up */
4441                                 sctp_m_freem(m);
4442                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
4443                                 return (ENOMEM);
4444                         }
4445                         SCTP_ATTACH_CHAIN(o_pak, m, packet_length);
4446                         if (port) {
4447 #if defined(SCTP_WITH_NO_CSUM)
4448                                 SCTP_STAT_INCR(sctps_sendnocrc);
4449 #else
4450                                 sctphdr->checksum = sctp_calculate_cksum(m, sizeof(struct ip6_hdr) + sizeof(struct udphdr));
4451                                 SCTP_STAT_INCR(sctps_sendswcrc);
4452 #endif
4453                                 if ((udp->uh_sum = in6_cksum(o_pak, IPPROTO_UDP, sizeof(struct ip6_hdr), packet_length - sizeof(struct ip6_hdr))) == 0) {
4454                                         udp->uh_sum = 0xffff;
4455                                 }
4456                         } else {
4457 #if defined(SCTP_WITH_NO_CSUM)
4458                                 SCTP_STAT_INCR(sctps_sendnocrc);
4459 #else
4460                                 m->m_pkthdr.csum_flags = CSUM_SCTP_IPV6;
4461                                 m->m_pkthdr.csum_data = 0;
4462                                 SCTP_STAT_INCR(sctps_sendhwcrc);
4463 #endif
4464                         }
4465                         /* send it out. table id is taken from stcb */
4466 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4467                         if ((SCTP_BASE_SYSCTL(sctp_output_unlocked)) && (so_locked)) {
4468                                 so = SCTP_INP_SO(inp);
4469                                 SCTP_SOCKET_UNLOCK(so, 0);
4470                         }
4471 #endif
4472 #ifdef SCTP_PACKET_LOGGING
4473                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING)
4474                                 sctp_packet_log(o_pak);
4475 #endif
4476                         SCTP_IP6_OUTPUT(ret, o_pak, (struct route_in6 *)ro, &ifp, stcb, vrf_id);
4477 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4478                         if ((SCTP_BASE_SYSCTL(sctp_output_unlocked)) && (so_locked)) {
4479                                 atomic_add_int(&stcb->asoc.refcnt, 1);
4480                                 SCTP_TCB_UNLOCK(stcb);
4481                                 SCTP_SOCKET_LOCK(so, 0);
4482                                 SCTP_TCB_LOCK(stcb);
4483                                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
4484                         }
4485 #endif
4486                         if (net) {
4487                                 /* for link local this must be done */
4488                                 sin6->sin6_scope_id = prev_scope;
4489                                 sin6->sin6_port = prev_port;
4490                         }
4491                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "return from send is %d\n", ret);
4492                         SCTP_STAT_INCR(sctps_sendpackets);
4493                         SCTP_STAT_INCR_COUNTER64(sctps_outpackets);
4494                         if (ret) {
4495                                 SCTP_STAT_INCR(sctps_senderrors);
4496                         }
4497                         if (net == NULL) {
4498                                 /* Now if we had a temp route free it */
4499                                 RO_RTFREE(ro);
4500                         } else {
4501                                 /*
4502                                  * PMTU check versus smallest asoc MTU goes
4503                                  * here
4504                                  */
4505                                 if (ro->ro_rt == NULL) {
4506                                         /* Route was freed */
4507                                         if (net->ro._s_addr &&
4508                                             net->src_addr_selected) {
4509                                                 sctp_free_ifa(net->ro._s_addr);
4510                                                 net->ro._s_addr = NULL;
4511                                         }
4512                                         net->src_addr_selected = 0;
4513                                 }
4514                                 if ((ro->ro_rt != NULL) &&
4515                                     (net->ro._s_addr)) {
4516                                         uint32_t mtu;
4517
4518                                         mtu = SCTP_GATHER_MTU_FROM_ROUTE(net->ro._s_addr, &net->ro._l_addr.sa, ro->ro_rt);
4519                                         if (mtu &&
4520                                             (stcb->asoc.smallest_mtu > mtu)) {
4521                                                 sctp_mtu_size_reset(inp, &stcb->asoc, mtu);
4522                                                 net->mtu = mtu;
4523                                                 if (net->port) {
4524                                                         net->mtu -= sizeof(struct udphdr);
4525                                                 }
4526                                         }
4527                                 } else if (ifp) {
4528                                         if (ND_IFINFO(ifp)->linkmtu &&
4529                                             (stcb->asoc.smallest_mtu > ND_IFINFO(ifp)->linkmtu)) {
4530                                                 sctp_mtu_size_reset(inp,
4531                                                     &stcb->asoc,
4532                                                     ND_IFINFO(ifp)->linkmtu);
4533                                         }
4534                                 }
4535                         }
4536                         return (ret);
4537                 }
4538 #endif
4539         default:
4540                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Unknown protocol (TSNH) type %d\n",
4541                     ((struct sockaddr *)to)->sa_family);
4542                 sctp_m_freem(m);
4543                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EFAULT);
4544                 return (EFAULT);
4545         }
4546 }
4547
4548
4549 void
4550 sctp_send_initiate(struct sctp_inpcb *inp, struct sctp_tcb *stcb, int so_locked
4551 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
4552     SCTP_UNUSED
4553 #endif
4554 )
4555 {
4556         struct mbuf *m;
4557         struct sctp_nets *net;
4558         struct sctp_init_chunk *init;
4559         struct sctp_supported_addr_param *sup_addr;
4560         struct sctp_adaptation_layer_indication *ali;
4561         struct sctp_supported_chunk_types_param *pr_supported;
4562         struct sctp_paramhdr *ph;
4563         int cnt_inits_to = 0;
4564         int ret;
4565         uint16_t num_ext, chunk_len, padding_len, parameter_len;
4566
4567         /* INIT's always go to the primary (and usually ONLY address) */
4568         net = stcb->asoc.primary_destination;
4569         if (net == NULL) {
4570                 net = TAILQ_FIRST(&stcb->asoc.nets);
4571                 if (net == NULL) {
4572                         /* TSNH */
4573                         return;
4574                 }
4575                 /* we confirm any address we send an INIT to */
4576                 net->dest_state &= ~SCTP_ADDR_UNCONFIRMED;
4577                 (void)sctp_set_primary_addr(stcb, NULL, net);
4578         } else {
4579                 /* we confirm any address we send an INIT to */
4580                 net->dest_state &= ~SCTP_ADDR_UNCONFIRMED;
4581         }
4582         SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT\n");
4583 #ifdef INET6
4584         if (net->ro._l_addr.sa.sa_family == AF_INET6) {
4585                 /*
4586                  * special hook, if we are sending to link local it will not
4587                  * show up in our private address count.
4588                  */
4589                 if (IN6_IS_ADDR_LINKLOCAL(&net->ro._l_addr.sin6.sin6_addr))
4590                         cnt_inits_to = 1;
4591         }
4592 #endif
4593         if (SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
4594                 /* This case should not happen */
4595                 SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT - failed timer?\n");
4596                 return;
4597         }
4598         /* start the INIT timer */
4599         sctp_timer_start(SCTP_TIMER_TYPE_INIT, inp, stcb, net);
4600
4601         m = sctp_get_mbuf_for_msg(MCLBYTES, 1, M_NOWAIT, 1, MT_DATA);
4602         if (m == NULL) {
4603                 /* No memory, INIT timer will re-attempt. */
4604                 SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT - mbuf?\n");
4605                 return;
4606         }
4607         chunk_len = (uint16_t) sizeof(struct sctp_init_chunk);
4608         padding_len = 0;
4609         /*
4610          * assume peer supports asconf in order to be able to queue local
4611          * address changes while an INIT is in flight and before the assoc
4612          * is established.
4613          */
4614         stcb->asoc.peer_supports_asconf = 1;
4615         /* Now lets put the chunk header in place */
4616         init = mtod(m, struct sctp_init_chunk *);
4617         /* now the chunk header */
4618         init->ch.chunk_type = SCTP_INITIATION;
4619         init->ch.chunk_flags = 0;
4620         /* fill in later from mbuf we build */
4621         init->ch.chunk_length = 0;
4622         /* place in my tag */
4623         init->init.initiate_tag = htonl(stcb->asoc.my_vtag);
4624         /* set up some of the credits. */
4625         init->init.a_rwnd = htonl(max(inp->sctp_socket ? SCTP_SB_LIMIT_RCV(inp->sctp_socket) : 0,
4626             SCTP_MINIMAL_RWND));
4627         init->init.num_outbound_streams = htons(stcb->asoc.pre_open_streams);
4628         init->init.num_inbound_streams = htons(stcb->asoc.max_inbound_streams);
4629         init->init.initial_tsn = htonl(stcb->asoc.init_seq_number);
4630
4631         if (stcb->asoc.scope.ipv4_addr_legal || stcb->asoc.scope.ipv6_addr_legal) {
4632                 uint8_t i;
4633
4634                 parameter_len = (uint16_t) sizeof(struct sctp_paramhdr);
4635                 if (stcb->asoc.scope.ipv4_addr_legal) {
4636                         parameter_len += (uint16_t) sizeof(uint16_t);
4637                 }
4638                 if (stcb->asoc.scope.ipv6_addr_legal) {
4639                         parameter_len += (uint16_t) sizeof(uint16_t);
4640                 }
4641                 sup_addr = (struct sctp_supported_addr_param *)(mtod(m, caddr_t)+chunk_len);
4642                 sup_addr->ph.param_type = htons(SCTP_SUPPORTED_ADDRTYPE);
4643                 sup_addr->ph.param_length = htons(parameter_len);
4644                 i = 0;
4645                 if (stcb->asoc.scope.ipv4_addr_legal) {
4646                         sup_addr->addr_type[i++] = htons(SCTP_IPV4_ADDRESS);
4647                 }
4648                 if (stcb->asoc.scope.ipv6_addr_legal) {
4649                         sup_addr->addr_type[i++] = htons(SCTP_IPV6_ADDRESS);
4650                 }
4651                 padding_len = 4 - 2 * i;
4652                 chunk_len += parameter_len;
4653         }
4654         /* Adaptation layer indication parameter */
4655         if (inp->sctp_ep.adaptation_layer_indicator_provided) {
4656                 if (padding_len > 0) {
4657                         memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
4658                         chunk_len += padding_len;
4659                         padding_len = 0;
4660                 }
4661                 parameter_len = (uint16_t) sizeof(struct sctp_adaptation_layer_indication);
4662                 ali = (struct sctp_adaptation_layer_indication *)(mtod(m, caddr_t)+chunk_len);
4663                 ali->ph.param_type = htons(SCTP_ULP_ADAPTATION);
4664                 ali->ph.param_length = htons(parameter_len);
4665                 ali->indication = ntohl(inp->sctp_ep.adaptation_layer_indicator);
4666                 chunk_len += parameter_len;
4667         }
4668         if (SCTP_BASE_SYSCTL(sctp_inits_include_nat_friendly)) {
4669                 /* Add NAT friendly parameter. */
4670                 if (padding_len > 0) {
4671                         memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
4672                         chunk_len += padding_len;
4673                         padding_len = 0;
4674                 }
4675                 parameter_len = (uint16_t) sizeof(struct sctp_paramhdr);
4676                 ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
4677                 ph->param_type = htons(SCTP_HAS_NAT_SUPPORT);
4678                 ph->param_length = htons(parameter_len);
4679                 chunk_len += parameter_len;
4680         }
4681         /* now any cookie time extensions */
4682         if (stcb->asoc.cookie_preserve_req) {
4683                 struct sctp_cookie_perserve_param *cookie_preserve;
4684
4685                 if (padding_len > 0) {
4686                         memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
4687                         chunk_len += padding_len;
4688                         padding_len = 0;
4689                 }
4690                 parameter_len = (uint16_t) sizeof(struct sctp_cookie_perserve_param);
4691                 cookie_preserve = (struct sctp_cookie_perserve_param *)(mtod(m, caddr_t)+chunk_len);
4692                 cookie_preserve->ph.param_type = htons(SCTP_COOKIE_PRESERVE);
4693                 cookie_preserve->ph.param_length = htons(parameter_len);
4694                 cookie_preserve->time = htonl(stcb->asoc.cookie_preserve_req);
4695                 stcb->asoc.cookie_preserve_req = 0;
4696                 chunk_len += parameter_len;
4697         }
4698         /* ECN parameter */
4699         if (stcb->asoc.ecn_allowed == 1) {
4700                 if (padding_len > 0) {
4701                         memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
4702                         chunk_len += padding_len;
4703                         padding_len = 0;
4704                 }
4705                 parameter_len = (uint16_t) sizeof(struct sctp_paramhdr);
4706                 ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
4707                 ph->param_type = htons(SCTP_ECN_CAPABLE);
4708                 ph->param_length = htons(parameter_len);
4709                 chunk_len += parameter_len;
4710         }
4711         /* And now tell the peer we do support PR-SCTP. */
4712         if (padding_len > 0) {
4713                 memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
4714                 chunk_len += padding_len;
4715                 padding_len = 0;
4716         }
4717         parameter_len = (uint16_t) sizeof(struct sctp_paramhdr);
4718         ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
4719         ph->param_type = htons(SCTP_PRSCTP_SUPPORTED);
4720         ph->param_length = htons(parameter_len);
4721         chunk_len += parameter_len;
4722
4723         /* And now tell the peer we do all the extensions */
4724         pr_supported = (struct sctp_supported_chunk_types_param *)(mtod(m, caddr_t)+chunk_len);
4725         pr_supported->ph.param_type = htons(SCTP_SUPPORTED_CHUNK_EXT);
4726         num_ext = 0;
4727         pr_supported->chunk_types[num_ext++] = SCTP_ASCONF;
4728         pr_supported->chunk_types[num_ext++] = SCTP_ASCONF_ACK;
4729         pr_supported->chunk_types[num_ext++] = SCTP_FORWARD_CUM_TSN;
4730         pr_supported->chunk_types[num_ext++] = SCTP_PACKET_DROPPED;
4731         pr_supported->chunk_types[num_ext++] = SCTP_STREAM_RESET;
4732         if (!SCTP_BASE_SYSCTL(sctp_auth_disable)) {
4733                 pr_supported->chunk_types[num_ext++] = SCTP_AUTHENTICATION;
4734         }
4735         if (stcb->asoc.sctp_nr_sack_on_off == 1) {
4736                 pr_supported->chunk_types[num_ext++] = SCTP_NR_SELECTIVE_ACK;
4737         }
4738         parameter_len = (uint16_t) sizeof(struct sctp_supported_chunk_types_param) + num_ext;
4739         pr_supported->ph.param_length = htons(parameter_len);
4740         padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
4741         chunk_len += parameter_len;
4742
4743         /* add authentication parameters */
4744         if (!SCTP_BASE_SYSCTL(sctp_auth_disable)) {
4745                 /* attach RANDOM parameter, if available */
4746                 if (stcb->asoc.authinfo.random != NULL) {
4747                         struct sctp_auth_random *randp;
4748
4749                         if (padding_len > 0) {
4750                                 memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
4751                                 chunk_len += padding_len;
4752                                 padding_len = 0;
4753                         }
4754                         randp = (struct sctp_auth_random *)(mtod(m, caddr_t)+chunk_len);
4755                         parameter_len = (uint16_t) sizeof(struct sctp_auth_random) + stcb->asoc.authinfo.random_len;
4756                         /* random key already contains the header */
4757                         memcpy(randp, stcb->asoc.authinfo.random->key, parameter_len);
4758                         padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
4759                         chunk_len += parameter_len;
4760                 }
4761                 /* add HMAC_ALGO parameter */
4762                 if ((stcb->asoc.local_hmacs != NULL) &&
4763                     (stcb->asoc.local_hmacs->num_algo > 0)) {
4764                         struct sctp_auth_hmac_algo *hmacs;
4765
4766                         if (padding_len > 0) {
4767                                 memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
4768                                 chunk_len += padding_len;
4769                                 padding_len = 0;
4770                         }
4771                         hmacs = (struct sctp_auth_hmac_algo *)(mtod(m, caddr_t)+chunk_len);
4772                         parameter_len = (uint16_t) (sizeof(struct sctp_auth_hmac_algo) +
4773                             stcb->asoc.local_hmacs->num_algo * sizeof(uint16_t));
4774                         hmacs->ph.param_type = htons(SCTP_HMAC_LIST);
4775                         hmacs->ph.param_length = htons(parameter_len);
4776                         sctp_serialize_hmaclist(stcb->asoc.local_hmacs, (uint8_t *) hmacs->hmac_ids);
4777                         padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
4778                         chunk_len += parameter_len;
4779                 }
4780                 /* add CHUNKS parameter */
4781                 if (sctp_auth_get_chklist_size(stcb->asoc.local_auth_chunks) > 0) {
4782                         struct sctp_auth_chunk_list *chunks;
4783
4784                         if (padding_len > 0) {
4785                                 memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
4786                                 chunk_len += padding_len;
4787                                 padding_len = 0;
4788                         }
4789                         chunks = (struct sctp_auth_chunk_list *)(mtod(m, caddr_t)+chunk_len);
4790                         parameter_len = (uint16_t) (sizeof(struct sctp_auth_chunk_list) +
4791                             sctp_auth_get_chklist_size(stcb->asoc.local_auth_chunks));
4792                         chunks->ph.param_type = htons(SCTP_CHUNK_LIST);
4793                         chunks->ph.param_length = htons(parameter_len);
4794                         sctp_serialize_auth_chunks(stcb->asoc.local_auth_chunks, chunks->chunk_types);
4795                         padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
4796                         chunk_len += parameter_len;
4797                 }
4798         }
4799         SCTP_BUF_LEN(m) = chunk_len;
4800
4801         /* now the addresses */
4802         /*
4803          * To optimize this we could put the scoping stuff into a structure
4804          * and remove the individual uint8's from the assoc structure. Then
4805          * we could just sifa in the address within the stcb. But for now
4806          * this is a quick hack to get the address stuff teased apart.
4807          */
4808         sctp_add_addresses_to_i_ia(inp, stcb, &stcb->asoc.scope, m, cnt_inits_to, &padding_len, &chunk_len);
4809
4810         init->ch.chunk_length = htons(chunk_len);
4811         if (padding_len > 0) {
4812                 struct mbuf *m_at, *mp_last;
4813
4814                 mp_last = NULL;
4815                 for (m_at = m; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
4816                         if (SCTP_BUF_NEXT(m_at) == NULL)
4817                                 mp_last = m_at;
4818                 }
4819                 if ((mp_last == NULL) || sctp_add_pad_tombuf(mp_last, padding_len)) {
4820                         sctp_m_freem(m);
4821                         return;
4822                 }
4823         }
4824         SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT - calls lowlevel_output\n");
4825         ret = sctp_lowlevel_chunk_output(inp, stcb, net,
4826             (struct sockaddr *)&net->ro._l_addr,
4827             m, 0, NULL, 0, 0, 0, 0,
4828             inp->sctp_lport, stcb->rport, htonl(0),
4829             net->port, NULL,
4830             0, 0,
4831             so_locked);
4832         SCTPDBG(SCTP_DEBUG_OUTPUT4, "lowlevel_output - %d\n", ret);
4833         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
4834         (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
4835 }
4836
4837 struct mbuf *
4838 sctp_arethere_unrecognized_parameters(struct mbuf *in_initpkt,
4839     int param_offset, int *abort_processing, struct sctp_chunkhdr *cp, int *nat_friendly)
4840 {
4841         /*
4842          * Given a mbuf containing an INIT or INIT-ACK with the param_offset
4843          * being equal to the beginning of the params i.e. (iphlen +
4844          * sizeof(struct sctp_init_msg) parse through the parameters to the
4845          * end of the mbuf verifying that all parameters are known.
4846          *
4847          * For unknown parameters build and return a mbuf with
4848          * UNRECOGNIZED_PARAMETER errors. If the flags indicate to stop
4849          * processing this chunk stop, and set *abort_processing to 1.
4850          *
4851          * By having param_offset be pre-set to where parameters begin it is
4852          * hoped that this routine may be reused in the future by new
4853          * features.
4854          */
4855         struct sctp_paramhdr *phdr, params;
4856
4857         struct mbuf *mat, *op_err;
4858         char tempbuf[SCTP_PARAM_BUFFER_SIZE];
4859         int at, limit, pad_needed;
4860         uint16_t ptype, plen, padded_size;
4861         int err_at;
4862
4863         *abort_processing = 0;
4864         mat = in_initpkt;
4865         err_at = 0;
4866         limit = ntohs(cp->chunk_length) - sizeof(struct sctp_init_chunk);
4867         at = param_offset;
4868         op_err = NULL;
4869         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Check for unrecognized param's\n");
4870         phdr = sctp_get_next_param(mat, at, &params, sizeof(params));
4871         while ((phdr != NULL) && ((size_t)limit >= sizeof(struct sctp_paramhdr))) {
4872                 ptype = ntohs(phdr->param_type);
4873                 plen = ntohs(phdr->param_length);
4874                 if ((plen > limit) || (plen < sizeof(struct sctp_paramhdr))) {
4875                         /* wacked parameter */
4876                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error %d\n", plen);
4877                         goto invalid_size;
4878                 }
4879                 limit -= SCTP_SIZE32(plen);
4880                 /*-
4881                  * All parameters for all chunks that we know/understand are
4882                  * listed here. We process them other places and make
4883                  * appropriate stop actions per the upper bits. However this
4884                  * is the generic routine processor's can call to get back
4885                  * an operr.. to either incorporate (init-ack) or send.
4886                  */
4887                 padded_size = SCTP_SIZE32(plen);
4888                 switch (ptype) {
4889                         /* Param's with variable size */
4890                 case SCTP_HEARTBEAT_INFO:
4891                 case SCTP_STATE_COOKIE:
4892                 case SCTP_UNRECOG_PARAM:
4893                 case SCTP_ERROR_CAUSE_IND:
4894                         /* ok skip fwd */
4895                         at += padded_size;
4896                         break;
4897                         /* Param's with variable size within a range */
4898                 case SCTP_CHUNK_LIST:
4899                 case SCTP_SUPPORTED_CHUNK_EXT:
4900                         if (padded_size > (sizeof(struct sctp_supported_chunk_types_param) + (sizeof(uint8_t) * SCTP_MAX_SUPPORTED_EXT))) {
4901                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error chklist %d\n", plen);
4902                                 goto invalid_size;
4903                         }
4904                         at += padded_size;
4905                         break;
4906                 case SCTP_SUPPORTED_ADDRTYPE:
4907                         if (padded_size > SCTP_MAX_ADDR_PARAMS_SIZE) {
4908                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error supaddrtype %d\n", plen);
4909                                 goto invalid_size;
4910                         }
4911                         at += padded_size;
4912                         break;
4913                 case SCTP_RANDOM:
4914                         if (padded_size > (sizeof(struct sctp_auth_random) + SCTP_RANDOM_MAX_SIZE)) {
4915                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error random %d\n", plen);
4916                                 goto invalid_size;
4917                         }
4918                         at += padded_size;
4919                         break;
4920                 case SCTP_SET_PRIM_ADDR:
4921                 case SCTP_DEL_IP_ADDRESS:
4922                 case SCTP_ADD_IP_ADDRESS:
4923                         if ((padded_size != sizeof(struct sctp_asconf_addrv4_param)) &&
4924                             (padded_size != sizeof(struct sctp_asconf_addr_param))) {
4925                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error setprim %d\n", plen);
4926                                 goto invalid_size;
4927                         }
4928                         at += padded_size;
4929                         break;
4930                         /* Param's with a fixed size */
4931                 case SCTP_IPV4_ADDRESS:
4932                         if (padded_size != sizeof(struct sctp_ipv4addr_param)) {
4933                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error ipv4 addr %d\n", plen);
4934                                 goto invalid_size;
4935                         }
4936                         at += padded_size;
4937                         break;
4938                 case SCTP_IPV6_ADDRESS:
4939                         if (padded_size != sizeof(struct sctp_ipv6addr_param)) {
4940                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error ipv6 addr %d\n", plen);
4941                                 goto invalid_size;
4942                         }
4943                         at += padded_size;
4944                         break;
4945                 case SCTP_COOKIE_PRESERVE:
4946                         if (padded_size != sizeof(struct sctp_cookie_perserve_param)) {
4947                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error cookie-preserve %d\n", plen);
4948                                 goto invalid_size;
4949                         }
4950                         at += padded_size;
4951                         break;
4952                 case SCTP_HAS_NAT_SUPPORT:
4953                         *nat_friendly = 1;
4954                         /* fall through */
4955                 case SCTP_PRSCTP_SUPPORTED:
4956
4957                         if (padded_size != sizeof(struct sctp_paramhdr)) {
4958                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error prsctp/nat support %d\n", plen);
4959                                 goto invalid_size;
4960                         }
4961                         at += padded_size;
4962                         break;
4963                 case SCTP_ECN_CAPABLE:
4964                         if (padded_size != sizeof(struct sctp_ecn_supported_param)) {
4965                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error ecn %d\n", plen);
4966                                 goto invalid_size;
4967                         }
4968                         at += padded_size;
4969                         break;
4970                 case SCTP_ULP_ADAPTATION:
4971                         if (padded_size != sizeof(struct sctp_adaptation_layer_indication)) {
4972                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error adapatation %d\n", plen);
4973                                 goto invalid_size;
4974                         }
4975                         at += padded_size;
4976                         break;
4977                 case SCTP_SUCCESS_REPORT:
4978                         if (padded_size != sizeof(struct sctp_asconf_paramhdr)) {
4979                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error success %d\n", plen);
4980                                 goto invalid_size;
4981                         }
4982                         at += padded_size;
4983                         break;
4984                 case SCTP_HOSTNAME_ADDRESS:
4985                         {
4986                                 /* We can NOT handle HOST NAME addresses!! */
4987                                 int l_len;
4988
4989                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Can't handle hostname addresses.. abort processing\n");
4990                                 *abort_processing = 1;
4991                                 if (op_err == NULL) {
4992                                         /* Ok need to try to get a mbuf */
4993 #ifdef INET6
4994                                         l_len = sizeof(struct ip6_hdr) + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
4995 #else
4996                                         l_len = sizeof(struct ip) + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
4997 #endif
4998                                         l_len += plen;
4999                                         l_len += sizeof(struct sctp_paramhdr);
5000                                         op_err = sctp_get_mbuf_for_msg(l_len, 0, M_NOWAIT, 1, MT_DATA);
5001                                         if (op_err) {
5002                                                 SCTP_BUF_LEN(op_err) = 0;
5003                                                 /*
5004                                                  * pre-reserve space for ip
5005                                                  * and sctp header  and
5006                                                  * chunk hdr
5007                                                  */
5008 #ifdef INET6
5009                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip6_hdr));
5010 #else
5011                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip));
5012 #endif
5013                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctphdr));
5014                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctp_chunkhdr));
5015                                         }
5016                                 }
5017                                 if (op_err) {
5018                                         /* If we have space */
5019                                         struct sctp_paramhdr s;
5020
5021                                         if (err_at % 4) {
5022                                                 uint32_t cpthis = 0;
5023
5024                                                 pad_needed = 4 - (err_at % 4);
5025                                                 m_copyback(op_err, err_at, pad_needed, (caddr_t)&cpthis);
5026                                                 err_at += pad_needed;
5027                                         }
5028                                         s.param_type = htons(SCTP_CAUSE_UNRESOLVABLE_ADDR);
5029                                         s.param_length = htons(sizeof(s) + plen);
5030                                         m_copyback(op_err, err_at, sizeof(s), (caddr_t)&s);
5031                                         err_at += sizeof(s);
5032                                         phdr = sctp_get_next_param(mat, at, (struct sctp_paramhdr *)tempbuf, min(sizeof(tempbuf), plen));
5033                                         if (phdr == NULL) {
5034                                                 sctp_m_freem(op_err);
5035                                                 /*
5036                                                  * we are out of memory but
5037                                                  * we still need to have a
5038                                                  * look at what to do (the
5039                                                  * system is in trouble
5040                                                  * though).
5041                                                  */
5042                                                 return (NULL);
5043                                         }
5044                                         m_copyback(op_err, err_at, plen, (caddr_t)phdr);
5045                                 }
5046                                 return (op_err);
5047                                 break;
5048                         }
5049                 default:
5050                         /*
5051                          * we do not recognize the parameter figure out what
5052                          * we do.
5053                          */
5054                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Hit default param %x\n", ptype);
5055                         if ((ptype & 0x4000) == 0x4000) {
5056                                 /* Report bit is set?? */
5057                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "report op err\n");
5058                                 if (op_err == NULL) {
5059                                         int l_len;
5060
5061                                         /* Ok need to try to get an mbuf */
5062 #ifdef INET6
5063                                         l_len = sizeof(struct ip6_hdr) + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
5064 #else
5065                                         l_len = sizeof(struct ip) + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
5066 #endif
5067                                         l_len += plen;
5068                                         l_len += sizeof(struct sctp_paramhdr);
5069                                         op_err = sctp_get_mbuf_for_msg(l_len, 0, M_NOWAIT, 1, MT_DATA);
5070                                         if (op_err) {
5071                                                 SCTP_BUF_LEN(op_err) = 0;
5072 #ifdef INET6
5073                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip6_hdr));
5074 #else
5075                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip));
5076 #endif
5077                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctphdr));
5078                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctp_chunkhdr));
5079                                         }
5080                                 }
5081                                 if (op_err) {
5082                                         /* If we have space */
5083                                         struct sctp_paramhdr s;
5084
5085                                         if (err_at % 4) {
5086                                                 uint32_t cpthis = 0;
5087
5088                                                 pad_needed = 4 - (err_at % 4);
5089                                                 m_copyback(op_err, err_at, pad_needed, (caddr_t)&cpthis);
5090                                                 err_at += pad_needed;
5091                                         }
5092                                         s.param_type = htons(SCTP_UNRECOG_PARAM);
5093                                         s.param_length = htons(sizeof(s) + plen);
5094                                         m_copyback(op_err, err_at, sizeof(s), (caddr_t)&s);
5095                                         err_at += sizeof(s);
5096                                         if (plen > sizeof(tempbuf)) {
5097                                                 plen = sizeof(tempbuf);
5098                                         }
5099                                         phdr = sctp_get_next_param(mat, at, (struct sctp_paramhdr *)tempbuf, min(sizeof(tempbuf), plen));
5100                                         if (phdr == NULL) {
5101                                                 sctp_m_freem(op_err);
5102                                                 /*
5103                                                  * we are out of memory but
5104                                                  * we still need to have a
5105                                                  * look at what to do (the
5106                                                  * system is in trouble
5107                                                  * though).
5108                                                  */
5109                                                 op_err = NULL;
5110                                                 goto more_processing;
5111                                         }
5112                                         m_copyback(op_err, err_at, plen, (caddr_t)phdr);
5113                                         err_at += plen;
5114                                 }
5115                         }
5116         more_processing:
5117                         if ((ptype & 0x8000) == 0x0000) {
5118                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "stop proc\n");
5119                                 return (op_err);
5120                         } else {
5121                                 /* skip this chunk and continue processing */
5122                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "move on\n");
5123                                 at += SCTP_SIZE32(plen);
5124                         }
5125                         break;
5126
5127                 }
5128                 phdr = sctp_get_next_param(mat, at, &params, sizeof(params));
5129         }
5130         return (op_err);
5131 invalid_size:
5132         SCTPDBG(SCTP_DEBUG_OUTPUT1, "abort flag set\n");
5133         *abort_processing = 1;
5134         if ((op_err == NULL) && phdr) {
5135                 int l_len;
5136
5137 #ifdef INET6
5138                 l_len = sizeof(struct ip6_hdr) + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
5139 #else
5140                 l_len = sizeof(struct ip) + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
5141 #endif
5142                 l_len += (2 * sizeof(struct sctp_paramhdr));
5143                 op_err = sctp_get_mbuf_for_msg(l_len, 0, M_NOWAIT, 1, MT_DATA);
5144                 if (op_err) {
5145                         SCTP_BUF_LEN(op_err) = 0;
5146 #ifdef INET6
5147                         SCTP_BUF_RESV_UF(op_err, sizeof(struct ip6_hdr));
5148 #else
5149                         SCTP_BUF_RESV_UF(op_err, sizeof(struct ip));
5150 #endif
5151                         SCTP_BUF_RESV_UF(op_err, sizeof(struct sctphdr));
5152                         SCTP_BUF_RESV_UF(op_err, sizeof(struct sctp_chunkhdr));
5153                 }
5154         }
5155         if ((op_err) && phdr) {
5156                 struct sctp_paramhdr s;
5157
5158                 if (err_at % 4) {
5159                         uint32_t cpthis = 0;
5160
5161                         pad_needed = 4 - (err_at % 4);
5162                         m_copyback(op_err, err_at, pad_needed, (caddr_t)&cpthis);
5163                         err_at += pad_needed;
5164                 }
5165                 s.param_type = htons(SCTP_CAUSE_PROTOCOL_VIOLATION);
5166                 s.param_length = htons(sizeof(s) + sizeof(struct sctp_paramhdr));
5167                 m_copyback(op_err, err_at, sizeof(s), (caddr_t)&s);
5168                 err_at += sizeof(s);
5169                 /* Only copy back the p-hdr that caused the issue */
5170                 m_copyback(op_err, err_at, sizeof(struct sctp_paramhdr), (caddr_t)phdr);
5171         }
5172         return (op_err);
5173 }
5174
5175 static int
5176 sctp_are_there_new_addresses(struct sctp_association *asoc,
5177     struct mbuf *in_initpkt, int offset, struct sockaddr *src)
5178 {
5179         /*
5180          * Given a INIT packet, look through the packet to verify that there
5181          * are NO new addresses. As we go through the parameters add reports
5182          * of any un-understood parameters that require an error.  Also we
5183          * must return (1) to drop the packet if we see a un-understood
5184          * parameter that tells us to drop the chunk.
5185          */
5186         struct sockaddr *sa_touse;
5187         struct sockaddr *sa;
5188         struct sctp_paramhdr *phdr, params;
5189         uint16_t ptype, plen;
5190         uint8_t fnd;
5191         struct sctp_nets *net;
5192
5193 #ifdef INET
5194         struct sockaddr_in sin4, *sa4;
5195
5196 #endif
5197 #ifdef INET6
5198         struct sockaddr_in6 sin6, *sa6;
5199
5200 #endif
5201
5202 #ifdef INET
5203         memset(&sin4, 0, sizeof(sin4));
5204         sin4.sin_family = AF_INET;
5205         sin4.sin_len = sizeof(sin4);
5206 #endif
5207 #ifdef INET6
5208         memset(&sin6, 0, sizeof(sin6));
5209         sin6.sin6_family = AF_INET6;
5210         sin6.sin6_len = sizeof(sin6);
5211 #endif
5212         /* First what about the src address of the pkt ? */
5213         fnd = 0;
5214         TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
5215                 sa = (struct sockaddr *)&net->ro._l_addr;
5216                 if (sa->sa_family == src->sa_family) {
5217 #ifdef INET
5218                         if (sa->sa_family == AF_INET) {
5219                                 struct sockaddr_in *src4;
5220
5221                                 sa4 = (struct sockaddr_in *)sa;
5222                                 src4 = (struct sockaddr_in *)src;
5223                                 if (sa4->sin_addr.s_addr == src4->sin_addr.s_addr) {
5224                                         fnd = 1;
5225                                         break;
5226                                 }
5227                         }
5228 #endif
5229 #ifdef INET6
5230                         if (sa->sa_family == AF_INET6) {
5231                                 struct sockaddr_in6 *src6;
5232
5233                                 sa6 = (struct sockaddr_in6 *)sa;
5234                                 src6 = (struct sockaddr_in6 *)src;
5235                                 if (SCTP6_ARE_ADDR_EQUAL(sa6, src6)) {
5236                                         fnd = 1;
5237                                         break;
5238                                 }
5239                         }
5240 #endif
5241                 }
5242         }
5243         if (fnd == 0) {
5244                 /* New address added! no need to look futher. */
5245                 return (1);
5246         }
5247         /* Ok so far lets munge through the rest of the packet */
5248         offset += sizeof(struct sctp_init_chunk);
5249         phdr = sctp_get_next_param(in_initpkt, offset, &params, sizeof(params));
5250         while (phdr) {
5251                 sa_touse = NULL;
5252                 ptype = ntohs(phdr->param_type);
5253                 plen = ntohs(phdr->param_length);
5254                 switch (ptype) {
5255 #ifdef INET
5256                 case SCTP_IPV4_ADDRESS:
5257                         {
5258                                 struct sctp_ipv4addr_param *p4, p4_buf;
5259
5260                                 phdr = sctp_get_next_param(in_initpkt, offset,
5261                                     (struct sctp_paramhdr *)&p4_buf, sizeof(p4_buf));
5262                                 if (plen != sizeof(struct sctp_ipv4addr_param) ||
5263                                     phdr == NULL) {
5264                                         return (1);
5265                                 }
5266                                 p4 = (struct sctp_ipv4addr_param *)phdr;
5267                                 sin4.sin_addr.s_addr = p4->addr;
5268                                 sa_touse = (struct sockaddr *)&sin4;
5269                                 break;
5270                         }
5271 #endif
5272 #ifdef INET6
5273                 case SCTP_IPV6_ADDRESS:
5274                         {
5275                                 struct sctp_ipv6addr_param *p6, p6_buf;
5276
5277                                 phdr = sctp_get_next_param(in_initpkt, offset,
5278                                     (struct sctp_paramhdr *)&p6_buf, sizeof(p6_buf));
5279                                 if (plen != sizeof(struct sctp_ipv6addr_param) ||
5280                                     phdr == NULL) {
5281                                         return (1);
5282                                 }
5283                                 p6 = (struct sctp_ipv6addr_param *)phdr;
5284                                 memcpy((caddr_t)&sin6.sin6_addr, p6->addr,
5285                                     sizeof(p6->addr));
5286                                 sa_touse = (struct sockaddr *)&sin6;
5287                                 break;
5288                         }
5289 #endif
5290                 default:
5291                         sa_touse = NULL;
5292                         break;
5293                 }
5294                 if (sa_touse) {
5295                         /* ok, sa_touse points to one to check */
5296                         fnd = 0;
5297                         TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
5298                                 sa = (struct sockaddr *)&net->ro._l_addr;
5299                                 if (sa->sa_family != sa_touse->sa_family) {
5300                                         continue;
5301                                 }
5302 #ifdef INET
5303                                 if (sa->sa_family == AF_INET) {
5304                                         sa4 = (struct sockaddr_in *)sa;
5305                                         if (sa4->sin_addr.s_addr ==
5306                                             sin4.sin_addr.s_addr) {
5307                                                 fnd = 1;
5308                                                 break;
5309                                         }
5310                                 }
5311 #endif
5312 #ifdef INET6
5313                                 if (sa->sa_family == AF_INET6) {
5314                                         sa6 = (struct sockaddr_in6 *)sa;
5315                                         if (SCTP6_ARE_ADDR_EQUAL(
5316                                             sa6, &sin6)) {
5317                                                 fnd = 1;
5318                                                 break;
5319                                         }
5320                                 }
5321 #endif
5322                         }
5323                         if (!fnd) {
5324                                 /* New addr added! no need to look further */
5325                                 return (1);
5326                         }
5327                 }
5328                 offset += SCTP_SIZE32(plen);
5329                 phdr = sctp_get_next_param(in_initpkt, offset, &params, sizeof(params));
5330         }
5331         return (0);
5332 }
5333
5334 /*
5335  * Given a MBUF chain that was sent into us containing an INIT. Build a
5336  * INIT-ACK with COOKIE and send back. We assume that the in_initpkt has done
5337  * a pullup to include IPv6/4header, SCTP header and initial part of INIT
5338  * message (i.e. the struct sctp_init_msg).
5339  */
5340 void
5341 sctp_send_initiate_ack(struct sctp_inpcb *inp, struct sctp_tcb *stcb,
5342     struct mbuf *init_pkt, int iphlen, int offset,
5343     struct sockaddr *src, struct sockaddr *dst,
5344     struct sctphdr *sh, struct sctp_init_chunk *init_chk,
5345     uint8_t use_mflowid, uint32_t mflowid,
5346     uint32_t vrf_id, uint16_t port, int hold_inp_lock)
5347 {
5348         struct sctp_association *asoc;
5349         struct mbuf *m, *m_at, *m_tmp, *m_cookie, *op_err, *mp_last;
5350         struct sctp_init_ack_chunk *initack;
5351         struct sctp_adaptation_layer_indication *ali;
5352         struct sctp_ecn_supported_param *ecn;
5353         struct sctp_prsctp_supported_param *prsctp;
5354         struct sctp_supported_chunk_types_param *pr_supported;
5355         union sctp_sockstore *over_addr;
5356
5357 #ifdef INET
5358         struct sockaddr_in *dst4 = (struct sockaddr_in *)dst;
5359         struct sockaddr_in *src4 = (struct sockaddr_in *)src;
5360         struct sockaddr_in *sin;
5361
5362 #endif
5363 #ifdef INET6
5364         struct sockaddr_in6 *dst6 = (struct sockaddr_in6 *)dst;
5365         struct sockaddr_in6 *src6 = (struct sockaddr_in6 *)src;
5366         struct sockaddr_in6 *sin6;
5367
5368 #endif
5369         struct sockaddr *to;
5370         struct sctp_state_cookie stc;
5371         struct sctp_nets *net = NULL;
5372         uint8_t *signature = NULL;
5373         int cnt_inits_to = 0;
5374         uint16_t his_limit, i_want;
5375         int abort_flag, padval;
5376         int num_ext;
5377         int p_len;
5378         int nat_friendly = 0;
5379         struct socket *so;
5380
5381         if (stcb) {
5382                 asoc = &stcb->asoc;
5383         } else {
5384                 asoc = NULL;
5385         }
5386         mp_last = NULL;
5387         if ((asoc != NULL) &&
5388             (SCTP_GET_STATE(asoc) != SCTP_STATE_COOKIE_WAIT) &&
5389             (sctp_are_there_new_addresses(asoc, init_pkt, offset, src))) {
5390                 /* new addresses, out of here in non-cookie-wait states */
5391                 /*
5392                  * Send a ABORT, we don't add the new address error clause
5393                  * though we even set the T bit and copy in the 0 tag.. this
5394                  * looks no different than if no listener was present.
5395                  */
5396                 sctp_send_abort(init_pkt, iphlen, src, dst, sh, 0, NULL,
5397                     use_mflowid, mflowid,
5398                     vrf_id, port);
5399                 return;
5400         }
5401         abort_flag = 0;
5402         op_err = sctp_arethere_unrecognized_parameters(init_pkt,
5403             (offset + sizeof(struct sctp_init_chunk)),
5404             &abort_flag, (struct sctp_chunkhdr *)init_chk, &nat_friendly);
5405         if (abort_flag) {
5406 do_a_abort:
5407                 sctp_send_abort(init_pkt, iphlen, src, dst, sh,
5408                     init_chk->init.initiate_tag, op_err,
5409                     use_mflowid, mflowid,
5410                     vrf_id, port);
5411                 return;
5412         }
5413         m = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
5414         if (m == NULL) {
5415                 /* No memory, INIT timer will re-attempt. */
5416                 if (op_err)
5417                         sctp_m_freem(op_err);
5418                 return;
5419         }
5420         SCTP_BUF_LEN(m) = sizeof(struct sctp_init_chunk);
5421
5422         /*
5423          * We might not overwrite the identification[] completely and on
5424          * some platforms time_entered will contain some padding. Therefore
5425          * zero out the cookie to avoid putting uninitialized memory on the
5426          * wire.
5427          */
5428         memset(&stc, 0, sizeof(struct sctp_state_cookie));
5429
5430         /* the time I built cookie */
5431         (void)SCTP_GETTIME_TIMEVAL(&stc.time_entered);
5432
5433         /* populate any tie tags */
5434         if (asoc != NULL) {
5435                 /* unlock before tag selections */
5436                 stc.tie_tag_my_vtag = asoc->my_vtag_nonce;
5437                 stc.tie_tag_peer_vtag = asoc->peer_vtag_nonce;
5438                 stc.cookie_life = asoc->cookie_life;
5439                 net = asoc->primary_destination;
5440         } else {
5441                 stc.tie_tag_my_vtag = 0;
5442                 stc.tie_tag_peer_vtag = 0;
5443                 /* life I will award this cookie */
5444                 stc.cookie_life = inp->sctp_ep.def_cookie_life;
5445         }
5446
5447         /* copy in the ports for later check */
5448         stc.myport = sh->dest_port;
5449         stc.peerport = sh->src_port;
5450
5451         /*
5452          * If we wanted to honor cookie life extentions, we would add to
5453          * stc.cookie_life. For now we should NOT honor any extension
5454          */
5455         stc.site_scope = stc.local_scope = stc.loopback_scope = 0;
5456         if (inp->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
5457                 stc.ipv6_addr_legal = 1;
5458                 if (SCTP_IPV6_V6ONLY(inp)) {
5459                         stc.ipv4_addr_legal = 0;
5460                 } else {
5461                         stc.ipv4_addr_legal = 1;
5462                 }
5463         } else {
5464                 stc.ipv6_addr_legal = 0;
5465                 stc.ipv4_addr_legal = 1;
5466         }
5467 #ifdef SCTP_DONT_DO_PRIVADDR_SCOPE
5468         stc.ipv4_scope = 1;
5469 #else
5470         stc.ipv4_scope = 0;
5471 #endif
5472         if (net == NULL) {
5473                 to = src;
5474                 switch (dst->sa_family) {
5475 #ifdef INET
5476                 case AF_INET:
5477                         {
5478                                 /* lookup address */
5479                                 stc.address[0] = src4->sin_addr.s_addr;
5480                                 stc.address[1] = 0;
5481                                 stc.address[2] = 0;
5482                                 stc.address[3] = 0;
5483                                 stc.addr_type = SCTP_IPV4_ADDRESS;
5484                                 /* local from address */
5485                                 stc.laddress[0] = dst4->sin_addr.s_addr;
5486                                 stc.laddress[1] = 0;
5487                                 stc.laddress[2] = 0;
5488                                 stc.laddress[3] = 0;
5489                                 stc.laddr_type = SCTP_IPV4_ADDRESS;
5490                                 /* scope_id is only for v6 */
5491                                 stc.scope_id = 0;
5492 #ifndef SCTP_DONT_DO_PRIVADDR_SCOPE
5493                                 if (IN4_ISPRIVATE_ADDRESS(&src4->sin_addr)) {
5494                                         stc.ipv4_scope = 1;
5495                                 }
5496 #else
5497                                 stc.ipv4_scope = 1;
5498 #endif                          /* SCTP_DONT_DO_PRIVADDR_SCOPE */
5499                                 /* Must use the address in this case */
5500                                 if (sctp_is_address_on_local_host(src, vrf_id)) {
5501                                         stc.loopback_scope = 1;
5502                                         stc.ipv4_scope = 1;
5503                                         stc.site_scope = 1;
5504                                         stc.local_scope = 0;
5505                                 }
5506                                 break;
5507                         }
5508 #endif
5509 #ifdef INET6
5510                 case AF_INET6:
5511                         {
5512                                 stc.addr_type = SCTP_IPV6_ADDRESS;
5513                                 memcpy(&stc.address, &src6->sin6_addr, sizeof(struct in6_addr));
5514                                 stc.scope_id = in6_getscope(&src6->sin6_addr);
5515                                 if (sctp_is_address_on_local_host(src, vrf_id)) {
5516                                         stc.loopback_scope = 1;
5517                                         stc.local_scope = 0;
5518                                         stc.site_scope = 1;
5519                                         stc.ipv4_scope = 1;
5520                                 } else if (IN6_IS_ADDR_LINKLOCAL(&src6->sin6_addr)) {
5521                                         /*
5522                                          * If the new destination is a
5523                                          * LINK_LOCAL we must have common
5524                                          * both site and local scope. Don't
5525                                          * set local scope though since we
5526                                          * must depend on the source to be
5527                                          * added implicitly. We cannot
5528                                          * assure just because we share one
5529                                          * link that all links are common.
5530                                          */
5531                                         stc.local_scope = 0;
5532                                         stc.site_scope = 1;
5533                                         stc.ipv4_scope = 1;
5534                                         /*
5535                                          * we start counting for the private
5536                                          * address stuff at 1. since the
5537                                          * link local we source from won't
5538                                          * show up in our scoped count.
5539                                          */
5540                                         cnt_inits_to = 1;
5541                                         /*
5542                                          * pull out the scope_id from
5543                                          * incoming pkt
5544                                          */
5545                                 } else if (IN6_IS_ADDR_SITELOCAL(&src6->sin6_addr)) {
5546                                         /*
5547                                          * If the new destination is
5548                                          * SITE_LOCAL then we must have site
5549                                          * scope in common.
5550                                          */
5551                                         stc.site_scope = 1;
5552                                 }
5553                                 memcpy(&stc.laddress, &dst6->sin6_addr, sizeof(struct in6_addr));
5554                                 stc.laddr_type = SCTP_IPV6_ADDRESS;
5555                                 break;
5556                         }
5557 #endif
5558                 default:
5559                         /* TSNH */
5560                         goto do_a_abort;
5561                         break;
5562                 }
5563         } else {
5564                 /* set the scope per the existing tcb */
5565
5566 #ifdef INET6
5567                 struct sctp_nets *lnet;
5568
5569 #endif
5570
5571                 stc.loopback_scope = asoc->scope.loopback_scope;
5572                 stc.ipv4_scope = asoc->scope.ipv4_local_scope;
5573                 stc.site_scope = asoc->scope.site_scope;
5574                 stc.local_scope = asoc->scope.local_scope;
5575 #ifdef INET6
5576                 /* Why do we not consider IPv4 LL addresses? */
5577                 TAILQ_FOREACH(lnet, &asoc->nets, sctp_next) {
5578                         if (lnet->ro._l_addr.sin6.sin6_family == AF_INET6) {
5579                                 if (IN6_IS_ADDR_LINKLOCAL(&lnet->ro._l_addr.sin6.sin6_addr)) {
5580                                         /*
5581                                          * if we have a LL address, start
5582                                          * counting at 1.
5583                                          */
5584                                         cnt_inits_to = 1;
5585                                 }
5586                         }
5587                 }
5588 #endif
5589                 /* use the net pointer */
5590                 to = (struct sockaddr *)&net->ro._l_addr;
5591                 switch (to->sa_family) {
5592 #ifdef INET
5593                 case AF_INET:
5594                         sin = (struct sockaddr_in *)to;
5595                         stc.address[0] = sin->sin_addr.s_addr;
5596                         stc.address[1] = 0;
5597                         stc.address[2] = 0;
5598                         stc.address[3] = 0;
5599                         stc.addr_type = SCTP_IPV4_ADDRESS;
5600                         if (net->src_addr_selected == 0) {
5601                                 /*
5602                                  * strange case here, the INIT should have
5603                                  * did the selection.
5604                                  */
5605                                 net->ro._s_addr = sctp_source_address_selection(inp,
5606                                     stcb, (sctp_route_t *) & net->ro,
5607                                     net, 0, vrf_id);
5608                                 if (net->ro._s_addr == NULL)
5609                                         return;
5610
5611                                 net->src_addr_selected = 1;
5612
5613                         }
5614                         stc.laddress[0] = net->ro._s_addr->address.sin.sin_addr.s_addr;
5615                         stc.laddress[1] = 0;
5616                         stc.laddress[2] = 0;
5617                         stc.laddress[3] = 0;
5618                         stc.laddr_type = SCTP_IPV4_ADDRESS;
5619                         /* scope_id is only for v6 */
5620                         stc.scope_id = 0;
5621                         break;
5622 #endif
5623 #ifdef INET6
5624                 case AF_INET6:
5625                         sin6 = (struct sockaddr_in6 *)to;
5626                         memcpy(&stc.address, &sin6->sin6_addr,
5627                             sizeof(struct in6_addr));
5628                         stc.addr_type = SCTP_IPV6_ADDRESS;
5629                         stc.scope_id = sin6->sin6_scope_id;
5630                         if (net->src_addr_selected == 0) {
5631                                 /*
5632                                  * strange case here, the INIT should have
5633                                  * done the selection.
5634                                  */
5635                                 net->ro._s_addr = sctp_source_address_selection(inp,
5636                                     stcb, (sctp_route_t *) & net->ro,
5637                                     net, 0, vrf_id);
5638                                 if (net->ro._s_addr == NULL)
5639                                         return;
5640
5641                                 net->src_addr_selected = 1;
5642                         }
5643                         memcpy(&stc.laddress, &net->ro._s_addr->address.sin6.sin6_addr,
5644                             sizeof(struct in6_addr));
5645                         stc.laddr_type = SCTP_IPV6_ADDRESS;
5646                         break;
5647 #endif
5648                 }
5649         }
5650         /* Now lets put the SCTP header in place */
5651         initack = mtod(m, struct sctp_init_ack_chunk *);
5652         /* Save it off for quick ref */
5653         stc.peers_vtag = init_chk->init.initiate_tag;
5654         /* who are we */
5655         memcpy(stc.identification, SCTP_VERSION_STRING,
5656             min(strlen(SCTP_VERSION_STRING), sizeof(stc.identification)));
5657         memset(stc.reserved, 0, SCTP_RESERVE_SPACE);
5658         /* now the chunk header */
5659         initack->ch.chunk_type = SCTP_INITIATION_ACK;
5660         initack->ch.chunk_flags = 0;
5661         /* fill in later from mbuf we build */
5662         initack->ch.chunk_length = 0;
5663         /* place in my tag */
5664         if ((asoc != NULL) &&
5665             ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) ||
5666             (SCTP_GET_STATE(asoc) == SCTP_STATE_INUSE) ||
5667             (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED))) {
5668                 /* re-use the v-tags and init-seq here */
5669                 initack->init.initiate_tag = htonl(asoc->my_vtag);
5670                 initack->init.initial_tsn = htonl(asoc->init_seq_number);
5671         } else {
5672                 uint32_t vtag, itsn;
5673
5674                 if (hold_inp_lock) {
5675                         SCTP_INP_INCR_REF(inp);
5676                         SCTP_INP_RUNLOCK(inp);
5677                 }
5678                 if (asoc) {
5679                         atomic_add_int(&asoc->refcnt, 1);
5680                         SCTP_TCB_UNLOCK(stcb);
5681         new_tag:
5682                         vtag = sctp_select_a_tag(inp, inp->sctp_lport, sh->src_port, 1);
5683                         if ((asoc->peer_supports_nat) && (vtag == asoc->my_vtag)) {
5684                                 /*
5685                                  * Got a duplicate vtag on some guy behind a
5686                                  * nat make sure we don't use it.
5687                                  */
5688                                 goto new_tag;
5689                         }
5690                         initack->init.initiate_tag = htonl(vtag);
5691                         /* get a TSN to use too */
5692                         itsn = sctp_select_initial_TSN(&inp->sctp_ep);
5693                         initack->init.initial_tsn = htonl(itsn);
5694                         SCTP_TCB_LOCK(stcb);
5695                         atomic_add_int(&asoc->refcnt, -1);
5696                 } else {
5697                         vtag = sctp_select_a_tag(inp, inp->sctp_lport, sh->src_port, 1);
5698                         initack->init.initiate_tag = htonl(vtag);
5699                         /* get a TSN to use too */
5700                         initack->init.initial_tsn = htonl(sctp_select_initial_TSN(&inp->sctp_ep));
5701                 }
5702                 if (hold_inp_lock) {
5703                         SCTP_INP_RLOCK(inp);
5704                         SCTP_INP_DECR_REF(inp);
5705                 }
5706         }
5707         /* save away my tag to */
5708         stc.my_vtag = initack->init.initiate_tag;
5709
5710         /* set up some of the credits. */
5711         so = inp->sctp_socket;
5712         if (so == NULL) {
5713                 /* memory problem */
5714                 sctp_m_freem(m);
5715                 return;
5716         } else {
5717                 initack->init.a_rwnd = htonl(max(SCTP_SB_LIMIT_RCV(so), SCTP_MINIMAL_RWND));
5718         }
5719         /* set what I want */
5720         his_limit = ntohs(init_chk->init.num_inbound_streams);
5721         /* choose what I want */
5722         if (asoc != NULL) {
5723                 if (asoc->streamoutcnt > inp->sctp_ep.pre_open_stream_count) {
5724                         i_want = asoc->streamoutcnt;
5725                 } else {
5726                         i_want = inp->sctp_ep.pre_open_stream_count;
5727                 }
5728         } else {
5729                 i_want = inp->sctp_ep.pre_open_stream_count;
5730         }
5731         if (his_limit < i_want) {
5732                 /* I Want more :< */
5733                 initack->init.num_outbound_streams = init_chk->init.num_inbound_streams;
5734         } else {
5735                 /* I can have what I want :> */
5736                 initack->init.num_outbound_streams = htons(i_want);
5737         }
5738         /* tell him his limit. */
5739         initack->init.num_inbound_streams =
5740             htons(inp->sctp_ep.max_open_streams_intome);
5741
5742         /* adaptation layer indication parameter */
5743         if (inp->sctp_ep.adaptation_layer_indicator_provided) {
5744                 ali = (struct sctp_adaptation_layer_indication *)((caddr_t)initack + sizeof(*initack));
5745                 ali->ph.param_type = htons(SCTP_ULP_ADAPTATION);
5746                 ali->ph.param_length = htons(sizeof(*ali));
5747                 ali->indication = ntohl(inp->sctp_ep.adaptation_layer_indicator);
5748                 SCTP_BUF_LEN(m) += sizeof(*ali);
5749                 ecn = (struct sctp_ecn_supported_param *)((caddr_t)ali + sizeof(*ali));
5750         } else {
5751                 ecn = (struct sctp_ecn_supported_param *)((caddr_t)initack + sizeof(*initack));
5752         }
5753
5754         /* ECN parameter */
5755         if (((asoc != NULL) && (asoc->ecn_allowed == 1)) ||
5756             (inp->sctp_ecn_enable == 1)) {
5757                 ecn->ph.param_type = htons(SCTP_ECN_CAPABLE);
5758                 ecn->ph.param_length = htons(sizeof(*ecn));
5759                 SCTP_BUF_LEN(m) += sizeof(*ecn);
5760
5761                 prsctp = (struct sctp_prsctp_supported_param *)((caddr_t)ecn +
5762                     sizeof(*ecn));
5763         } else {
5764                 prsctp = (struct sctp_prsctp_supported_param *)((caddr_t)ecn);
5765         }
5766         /* And now tell the peer we do  pr-sctp */
5767         prsctp->ph.param_type = htons(SCTP_PRSCTP_SUPPORTED);
5768         prsctp->ph.param_length = htons(sizeof(*prsctp));
5769         SCTP_BUF_LEN(m) += sizeof(*prsctp);
5770         if (nat_friendly) {
5771                 /* Add NAT friendly parameter */
5772                 struct sctp_paramhdr *ph;
5773
5774                 ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+SCTP_BUF_LEN(m));
5775                 ph->param_type = htons(SCTP_HAS_NAT_SUPPORT);
5776                 ph->param_length = htons(sizeof(struct sctp_paramhdr));
5777                 SCTP_BUF_LEN(m) += sizeof(struct sctp_paramhdr);
5778         }
5779         /* And now tell the peer we do all the extensions */
5780         pr_supported = (struct sctp_supported_chunk_types_param *)(mtod(m, caddr_t)+SCTP_BUF_LEN(m));
5781         pr_supported->ph.param_type = htons(SCTP_SUPPORTED_CHUNK_EXT);
5782         num_ext = 0;
5783         pr_supported->chunk_types[num_ext++] = SCTP_ASCONF;
5784         pr_supported->chunk_types[num_ext++] = SCTP_ASCONF_ACK;
5785         pr_supported->chunk_types[num_ext++] = SCTP_FORWARD_CUM_TSN;
5786         pr_supported->chunk_types[num_ext++] = SCTP_PACKET_DROPPED;
5787         pr_supported->chunk_types[num_ext++] = SCTP_STREAM_RESET;
5788         if (!SCTP_BASE_SYSCTL(sctp_auth_disable))
5789                 pr_supported->chunk_types[num_ext++] = SCTP_AUTHENTICATION;
5790         if (SCTP_BASE_SYSCTL(sctp_nr_sack_on_off))
5791                 pr_supported->chunk_types[num_ext++] = SCTP_NR_SELECTIVE_ACK;
5792         p_len = sizeof(*pr_supported) + num_ext;
5793         pr_supported->ph.param_length = htons(p_len);
5794         bzero((caddr_t)pr_supported + p_len, SCTP_SIZE32(p_len) - p_len);
5795         SCTP_BUF_LEN(m) += SCTP_SIZE32(p_len);
5796
5797         /* add authentication parameters */
5798         if (!SCTP_BASE_SYSCTL(sctp_auth_disable)) {
5799                 struct sctp_auth_random *randp;
5800                 struct sctp_auth_hmac_algo *hmacs;
5801                 struct sctp_auth_chunk_list *chunks;
5802                 uint16_t random_len;
5803
5804                 /* generate and add RANDOM parameter */
5805                 random_len = SCTP_AUTH_RANDOM_SIZE_DEFAULT;
5806                 randp = (struct sctp_auth_random *)(mtod(m, caddr_t)+SCTP_BUF_LEN(m));
5807                 randp->ph.param_type = htons(SCTP_RANDOM);
5808                 p_len = sizeof(*randp) + random_len;
5809                 randp->ph.param_length = htons(p_len);
5810                 SCTP_READ_RANDOM(randp->random_data, random_len);
5811                 /* zero out any padding required */
5812                 bzero((caddr_t)randp + p_len, SCTP_SIZE32(p_len) - p_len);
5813                 SCTP_BUF_LEN(m) += SCTP_SIZE32(p_len);
5814
5815                 /* add HMAC_ALGO parameter */
5816                 hmacs = (struct sctp_auth_hmac_algo *)(mtod(m, caddr_t)+SCTP_BUF_LEN(m));
5817                 p_len = sctp_serialize_hmaclist(inp->sctp_ep.local_hmacs,
5818                     (uint8_t *) hmacs->hmac_ids);
5819                 if (p_len > 0) {
5820                         p_len += sizeof(*hmacs);
5821                         hmacs->ph.param_type = htons(SCTP_HMAC_LIST);
5822                         hmacs->ph.param_length = htons(p_len);
5823                         /* zero out any padding required */
5824                         bzero((caddr_t)hmacs + p_len, SCTP_SIZE32(p_len) - p_len);
5825                         SCTP_BUF_LEN(m) += SCTP_SIZE32(p_len);
5826                 }
5827                 /* add CHUNKS parameter */
5828                 chunks = (struct sctp_auth_chunk_list *)(mtod(m, caddr_t)+SCTP_BUF_LEN(m));
5829                 p_len = sctp_serialize_auth_chunks(inp->sctp_ep.local_auth_chunks,
5830                     chunks->chunk_types);
5831                 if (p_len > 0) {
5832                         p_len += sizeof(*chunks);
5833                         chunks->ph.param_type = htons(SCTP_CHUNK_LIST);
5834                         chunks->ph.param_length = htons(p_len);
5835                         /* zero out any padding required */
5836                         bzero((caddr_t)chunks + p_len, SCTP_SIZE32(p_len) - p_len);
5837                         SCTP_BUF_LEN(m) += SCTP_SIZE32(p_len);
5838                 }
5839         }
5840         m_at = m;
5841         /* now the addresses */
5842         {
5843                 struct sctp_scoping scp;
5844
5845                 /*
5846                  * To optimize this we could put the scoping stuff into a
5847                  * structure and remove the individual uint8's from the stc
5848                  * structure. Then we could just sifa in the address within
5849                  * the stc.. but for now this is a quick hack to get the
5850                  * address stuff teased apart.
5851                  */
5852                 scp.ipv4_addr_legal = stc.ipv4_addr_legal;
5853                 scp.ipv6_addr_legal = stc.ipv6_addr_legal;
5854                 scp.loopback_scope = stc.loopback_scope;
5855                 scp.ipv4_local_scope = stc.ipv4_scope;
5856                 scp.local_scope = stc.local_scope;
5857                 scp.site_scope = stc.site_scope;
5858                 m_at = sctp_add_addresses_to_i_ia(inp, stcb, &scp, m_at, cnt_inits_to, NULL, NULL);
5859         }
5860
5861         /* tack on the operational error if present */
5862         if (op_err) {
5863                 struct mbuf *ol;
5864                 int llen;
5865
5866                 llen = 0;
5867                 ol = op_err;
5868
5869                 while (ol) {
5870                         llen += SCTP_BUF_LEN(ol);
5871                         ol = SCTP_BUF_NEXT(ol);
5872                 }
5873                 if (llen % 4) {
5874                         /* must add a pad to the param */
5875                         uint32_t cpthis = 0;
5876                         int padlen;
5877
5878                         padlen = 4 - (llen % 4);
5879                         m_copyback(op_err, llen, padlen, (caddr_t)&cpthis);
5880                 }
5881                 while (SCTP_BUF_NEXT(m_at) != NULL) {
5882                         m_at = SCTP_BUF_NEXT(m_at);
5883                 }
5884                 SCTP_BUF_NEXT(m_at) = op_err;
5885                 while (SCTP_BUF_NEXT(m_at) != NULL) {
5886                         m_at = SCTP_BUF_NEXT(m_at);
5887                 }
5888         }
5889         /* pre-calulate the size and update pkt header and chunk header */
5890         p_len = 0;
5891         for (m_tmp = m; m_tmp; m_tmp = SCTP_BUF_NEXT(m_tmp)) {
5892                 p_len += SCTP_BUF_LEN(m_tmp);
5893                 if (SCTP_BUF_NEXT(m_tmp) == NULL) {
5894                         /* m_tmp should now point to last one */
5895                         break;
5896                 }
5897         }
5898
5899         /* Now we must build a cookie */
5900         m_cookie = sctp_add_cookie(init_pkt, offset, m, 0, &stc, &signature);
5901         if (m_cookie == NULL) {
5902                 /* memory problem */
5903                 sctp_m_freem(m);
5904                 return;
5905         }
5906         /* Now append the cookie to the end and update the space/size */
5907         SCTP_BUF_NEXT(m_tmp) = m_cookie;
5908
5909         for (m_tmp = m_cookie; m_tmp; m_tmp = SCTP_BUF_NEXT(m_tmp)) {
5910                 p_len += SCTP_BUF_LEN(m_tmp);
5911                 if (SCTP_BUF_NEXT(m_tmp) == NULL) {
5912                         /* m_tmp should now point to last one */
5913                         mp_last = m_tmp;
5914                         break;
5915                 }
5916         }
5917         /*
5918          * Place in the size, but we don't include the last pad (if any) in
5919          * the INIT-ACK.
5920          */
5921         initack->ch.chunk_length = htons(p_len);
5922
5923         /*
5924          * Time to sign the cookie, we don't sign over the cookie signature
5925          * though thus we set trailer.
5926          */
5927         (void)sctp_hmac_m(SCTP_HMAC,
5928             (uint8_t *) inp->sctp_ep.secret_key[(int)(inp->sctp_ep.current_secret_number)],
5929             SCTP_SECRET_SIZE, m_cookie, sizeof(struct sctp_paramhdr),
5930             (uint8_t *) signature, SCTP_SIGNATURE_SIZE);
5931         /*
5932          * We sifa 0 here to NOT set IP_DF if its IPv4, we ignore the return
5933          * here since the timer will drive a retranmission.
5934          */
5935         padval = p_len % 4;
5936         if ((padval) && (mp_last)) {
5937                 /* see my previous comments on mp_last */
5938                 if (sctp_add_pad_tombuf(mp_last, (4 - padval))) {
5939                         /* Houston we have a problem, no space */
5940                         sctp_m_freem(m);
5941                         return;
5942                 }
5943         }
5944         if (stc.loopback_scope) {
5945                 over_addr = (union sctp_sockstore *)dst;
5946         } else {
5947                 over_addr = NULL;
5948         }
5949
5950         (void)sctp_lowlevel_chunk_output(inp, NULL, NULL, to, m, 0, NULL, 0, 0,
5951             0, 0,
5952             inp->sctp_lport, sh->src_port, init_chk->init.initiate_tag,
5953             port, over_addr,
5954             use_mflowid, mflowid,
5955             SCTP_SO_NOT_LOCKED);
5956         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
5957 }
5958
5959
5960 static void
5961 sctp_prune_prsctp(struct sctp_tcb *stcb,
5962     struct sctp_association *asoc,
5963     struct sctp_sndrcvinfo *srcv,
5964     int dataout)
5965 {
5966         int freed_spc = 0;
5967         struct sctp_tmit_chunk *chk, *nchk;
5968
5969         SCTP_TCB_LOCK_ASSERT(stcb);
5970         if ((asoc->peer_supports_prsctp) &&
5971             (asoc->sent_queue_cnt_removeable > 0)) {
5972                 TAILQ_FOREACH(chk, &asoc->sent_queue, sctp_next) {
5973                         /*
5974                          * Look for chunks marked with the PR_SCTP flag AND
5975                          * the buffer space flag. If the one being sent is
5976                          * equal or greater priority then purge the old one
5977                          * and free some space.
5978                          */
5979                         if (PR_SCTP_BUF_ENABLED(chk->flags)) {
5980                                 /*
5981                                  * This one is PR-SCTP AND buffer space
5982                                  * limited type
5983                                  */
5984                                 if (chk->rec.data.timetodrop.tv_sec >= (long)srcv->sinfo_timetolive) {
5985                                         /*
5986                                          * Lower numbers equates to higher
5987                                          * priority so if the one we are
5988                                          * looking at has a larger or equal
5989                                          * priority we want to drop the data
5990                                          * and NOT retransmit it.
5991                                          */
5992                                         if (chk->data) {
5993                                                 /*
5994                                                  * We release the book_size
5995                                                  * if the mbuf is here
5996                                                  */
5997                                                 int ret_spc;
5998                                                 uint8_t sent;
5999
6000                                                 if (chk->sent > SCTP_DATAGRAM_UNSENT)
6001                                                         sent = 1;
6002                                                 else
6003                                                         sent = 0;
6004                                                 ret_spc = sctp_release_pr_sctp_chunk(stcb, chk,
6005                                                     sent,
6006                                                     SCTP_SO_LOCKED);
6007                                                 freed_spc += ret_spc;
6008                                                 if (freed_spc >= dataout) {
6009                                                         return;
6010                                                 }
6011                                         }       /* if chunk was present */
6012                                 }       /* if of sufficent priority */
6013                         }       /* if chunk has enabled */
6014                 }               /* tailqforeach */
6015
6016                 TAILQ_FOREACH_SAFE(chk, &asoc->send_queue, sctp_next, nchk) {
6017                         /* Here we must move to the sent queue and mark */
6018                         if (PR_SCTP_BUF_ENABLED(chk->flags)) {
6019                                 if (chk->rec.data.timetodrop.tv_sec >= (long)srcv->sinfo_timetolive) {
6020                                         if (chk->data) {
6021                                                 /*
6022                                                  * We release the book_size
6023                                                  * if the mbuf is here
6024                                                  */
6025                                                 int ret_spc;
6026
6027                                                 ret_spc = sctp_release_pr_sctp_chunk(stcb, chk,
6028                                                     0, SCTP_SO_LOCKED);
6029
6030                                                 freed_spc += ret_spc;
6031                                                 if (freed_spc >= dataout) {
6032                                                         return;
6033                                                 }
6034                                         }       /* end if chk->data */
6035                                 }       /* end if right class */
6036                         }       /* end if chk pr-sctp */
6037                 }               /* tailqforeachsafe (chk) */
6038         }                       /* if enabled in asoc */
6039 }
6040
6041 int
6042 sctp_get_frag_point(struct sctp_tcb *stcb,
6043     struct sctp_association *asoc)
6044 {
6045         int siz, ovh;
6046
6047         /*
6048          * For endpoints that have both v6 and v4 addresses we must reserve
6049          * room for the ipv6 header, for those that are only dealing with V4
6050          * we use a larger frag point.
6051          */
6052         if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
6053                 ovh = SCTP_MED_OVERHEAD;
6054         } else {
6055                 ovh = SCTP_MED_V4_OVERHEAD;
6056         }
6057
6058         if (stcb->asoc.sctp_frag_point > asoc->smallest_mtu)
6059                 siz = asoc->smallest_mtu - ovh;
6060         else
6061                 siz = (stcb->asoc.sctp_frag_point - ovh);
6062         /*
6063          * if (siz > (MCLBYTES-sizeof(struct sctp_data_chunk))) {
6064          */
6065         /* A data chunk MUST fit in a cluster */
6066         /* siz = (MCLBYTES - sizeof(struct sctp_data_chunk)); */
6067         /* } */
6068
6069         /* adjust for an AUTH chunk if DATA requires auth */
6070         if (sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks))
6071                 siz -= sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
6072
6073         if (siz % 4) {
6074                 /* make it an even word boundary please */
6075                 siz -= (siz % 4);
6076         }
6077         return (siz);
6078 }
6079
6080 static void
6081 sctp_set_prsctp_policy(struct sctp_stream_queue_pending *sp)
6082 {
6083         /*
6084          * We assume that the user wants PR_SCTP_TTL if the user provides a
6085          * positive lifetime but does not specify any PR_SCTP policy.
6086          */
6087         if (PR_SCTP_ENABLED(sp->sinfo_flags)) {
6088                 sp->act_flags |= PR_SCTP_POLICY(sp->sinfo_flags);
6089         } else if (sp->timetolive > 0) {
6090                 sp->sinfo_flags |= SCTP_PR_SCTP_TTL;
6091                 sp->act_flags |= PR_SCTP_POLICY(sp->sinfo_flags);
6092         } else {
6093                 return;
6094         }
6095         switch (PR_SCTP_POLICY(sp->sinfo_flags)) {
6096         case CHUNK_FLAGS_PR_SCTP_BUF:
6097                 /*
6098                  * Time to live is a priority stored in tv_sec when doing
6099                  * the buffer drop thing.
6100                  */
6101                 sp->ts.tv_sec = sp->timetolive;
6102                 sp->ts.tv_usec = 0;
6103                 break;
6104         case CHUNK_FLAGS_PR_SCTP_TTL:
6105                 {
6106                         struct timeval tv;
6107
6108                         (void)SCTP_GETTIME_TIMEVAL(&sp->ts);
6109                         tv.tv_sec = sp->timetolive / 1000;
6110                         tv.tv_usec = (sp->timetolive * 1000) % 1000000;
6111                         /*
6112                          * TODO sctp_constants.h needs alternative time
6113                          * macros when _KERNEL is undefined.
6114                          */
6115                         timevaladd(&sp->ts, &tv);
6116                 }
6117                 break;
6118         case CHUNK_FLAGS_PR_SCTP_RTX:
6119                 /*
6120                  * Time to live is a the number or retransmissions stored in
6121                  * tv_sec.
6122                  */
6123                 sp->ts.tv_sec = sp->timetolive;
6124                 sp->ts.tv_usec = 0;
6125                 break;
6126         default:
6127                 SCTPDBG(SCTP_DEBUG_USRREQ1,
6128                     "Unknown PR_SCTP policy %u.\n",
6129                     PR_SCTP_POLICY(sp->sinfo_flags));
6130                 break;
6131         }
6132 }
6133
6134 static int
6135 sctp_msg_append(struct sctp_tcb *stcb,
6136     struct sctp_nets *net,
6137     struct mbuf *m,
6138     struct sctp_sndrcvinfo *srcv, int hold_stcb_lock)
6139 {
6140         int error = 0;
6141         struct mbuf *at;
6142         struct sctp_stream_queue_pending *sp = NULL;
6143         struct sctp_stream_out *strm;
6144
6145         /*
6146          * Given an mbuf chain, put it into the association send queue and
6147          * place it on the wheel
6148          */
6149         if (srcv->sinfo_stream >= stcb->asoc.streamoutcnt) {
6150                 /* Invalid stream number */
6151                 SCTP_LTRACE_ERR_RET_PKT(m, NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
6152                 error = EINVAL;
6153                 goto out_now;
6154         }
6155         if ((stcb->asoc.stream_locked) &&
6156             (stcb->asoc.stream_locked_on != srcv->sinfo_stream)) {
6157                 SCTP_LTRACE_ERR_RET_PKT(m, NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
6158                 error = EINVAL;
6159                 goto out_now;
6160         }
6161         strm = &stcb->asoc.strmout[srcv->sinfo_stream];
6162         /* Now can we send this? */
6163         if ((SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_SENT) ||
6164             (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) ||
6165             (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_RECEIVED) ||
6166             (stcb->asoc.state & SCTP_STATE_SHUTDOWN_PENDING)) {
6167                 /* got data while shutting down */
6168                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
6169                 error = ECONNRESET;
6170                 goto out_now;
6171         }
6172         sctp_alloc_a_strmoq(stcb, sp);
6173         if (sp == NULL) {
6174                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
6175                 error = ENOMEM;
6176                 goto out_now;
6177         }
6178         sp->sinfo_flags = srcv->sinfo_flags;
6179         sp->timetolive = srcv->sinfo_timetolive;
6180         sp->ppid = srcv->sinfo_ppid;
6181         sp->context = srcv->sinfo_context;
6182         if (sp->sinfo_flags & SCTP_ADDR_OVER) {
6183                 sp->net = net;
6184                 atomic_add_int(&sp->net->ref_count, 1);
6185         } else {
6186                 sp->net = NULL;
6187         }
6188         (void)SCTP_GETTIME_TIMEVAL(&sp->ts);
6189         sp->stream = srcv->sinfo_stream;
6190         sp->msg_is_complete = 1;
6191         sp->sender_all_done = 1;
6192         sp->some_taken = 0;
6193         sp->data = m;
6194         sp->tail_mbuf = NULL;
6195         sctp_set_prsctp_policy(sp);
6196         /*
6197          * We could in theory (for sendall) sifa the length in, but we would
6198          * still have to hunt through the chain since we need to setup the
6199          * tail_mbuf
6200          */
6201         sp->length = 0;
6202         for (at = m; at; at = SCTP_BUF_NEXT(at)) {
6203                 if (SCTP_BUF_NEXT(at) == NULL)
6204                         sp->tail_mbuf = at;
6205                 sp->length += SCTP_BUF_LEN(at);
6206         }
6207         if (srcv->sinfo_keynumber_valid) {
6208                 sp->auth_keyid = srcv->sinfo_keynumber;
6209         } else {
6210                 sp->auth_keyid = stcb->asoc.authinfo.active_keyid;
6211         }
6212         if (sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks)) {
6213                 sctp_auth_key_acquire(stcb, sp->auth_keyid);
6214                 sp->holds_key_ref = 1;
6215         }
6216         if (hold_stcb_lock == 0) {
6217                 SCTP_TCB_SEND_LOCK(stcb);
6218         }
6219         sctp_snd_sb_alloc(stcb, sp->length);
6220         atomic_add_int(&stcb->asoc.stream_queue_cnt, 1);
6221         TAILQ_INSERT_TAIL(&strm->outqueue, sp, next);
6222         stcb->asoc.ss_functions.sctp_ss_add_to_stream(stcb, &stcb->asoc, strm, sp, 1);
6223         m = NULL;
6224         if (hold_stcb_lock == 0) {
6225                 SCTP_TCB_SEND_UNLOCK(stcb);
6226         }
6227 out_now:
6228         if (m) {
6229                 sctp_m_freem(m);
6230         }
6231         return (error);
6232 }
6233
6234
6235 static struct mbuf *
6236 sctp_copy_mbufchain(struct mbuf *clonechain,
6237     struct mbuf *outchain,
6238     struct mbuf **endofchain,
6239     int can_take_mbuf,
6240     int sizeofcpy,
6241     uint8_t copy_by_ref)
6242 {
6243         struct mbuf *m;
6244         struct mbuf *appendchain;
6245         caddr_t cp;
6246         int len;
6247
6248         if (endofchain == NULL) {
6249                 /* error */
6250 error_out:
6251                 if (outchain)
6252                         sctp_m_freem(outchain);
6253                 return (NULL);
6254         }
6255         if (can_take_mbuf) {
6256                 appendchain = clonechain;
6257         } else {
6258                 if (!copy_by_ref &&
6259                     (sizeofcpy <= (int)((((SCTP_BASE_SYSCTL(sctp_mbuf_threshold_count) - 1) * MLEN) + MHLEN)))
6260                     ) {
6261                         /* Its not in a cluster */
6262                         if (*endofchain == NULL) {
6263                                 /* lets get a mbuf cluster */
6264                                 if (outchain == NULL) {
6265                                         /* This is the general case */
6266                         new_mbuf:
6267                                         outchain = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_HEADER);
6268                                         if (outchain == NULL) {
6269                                                 goto error_out;
6270                                         }
6271                                         SCTP_BUF_LEN(outchain) = 0;
6272                                         *endofchain = outchain;
6273                                         /* get the prepend space */
6274                                         SCTP_BUF_RESV_UF(outchain, (SCTP_FIRST_MBUF_RESV + 4));
6275                                 } else {
6276                                         /*
6277                                          * We really should not get a NULL
6278                                          * in endofchain
6279                                          */
6280                                         /* find end */
6281                                         m = outchain;
6282                                         while (m) {
6283                                                 if (SCTP_BUF_NEXT(m) == NULL) {
6284                                                         *endofchain = m;
6285                                                         break;
6286                                                 }
6287                                                 m = SCTP_BUF_NEXT(m);
6288                                         }
6289                                         /* sanity */
6290                                         if (*endofchain == NULL) {
6291                                                 /*
6292                                                  * huh, TSNH XXX maybe we
6293                                                  * should panic
6294                                                  */
6295                                                 sctp_m_freem(outchain);
6296                                                 goto new_mbuf;
6297                                         }
6298                                 }
6299                                 /* get the new end of length */
6300                                 len = M_TRAILINGSPACE(*endofchain);
6301                         } else {
6302                                 /* how much is left at the end? */
6303                                 len = M_TRAILINGSPACE(*endofchain);
6304                         }
6305                         /* Find the end of the data, for appending */
6306                         cp = (mtod((*endofchain), caddr_t)+SCTP_BUF_LEN((*endofchain)));
6307
6308                         /* Now lets copy it out */
6309                         if (len >= sizeofcpy) {
6310                                 /* It all fits, copy it in */
6311                                 m_copydata(clonechain, 0, sizeofcpy, cp);
6312                                 SCTP_BUF_LEN((*endofchain)) += sizeofcpy;
6313                         } else {
6314                                 /* fill up the end of the chain */
6315                                 if (len > 0) {
6316                                         m_copydata(clonechain, 0, len, cp);
6317                                         SCTP_BUF_LEN((*endofchain)) += len;
6318                                         /* now we need another one */
6319                                         sizeofcpy -= len;
6320                                 }
6321                                 m = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_HEADER);
6322                                 if (m == NULL) {
6323                                         /* We failed */
6324                                         goto error_out;
6325                                 }
6326                                 SCTP_BUF_NEXT((*endofchain)) = m;
6327                                 *endofchain = m;
6328                                 cp = mtod((*endofchain), caddr_t);
6329                                 m_copydata(clonechain, len, sizeofcpy, cp);
6330                                 SCTP_BUF_LEN((*endofchain)) += sizeofcpy;
6331                         }
6332                         return (outchain);
6333                 } else {
6334                         /* copy the old fashion way */
6335                         appendchain = SCTP_M_COPYM(clonechain, 0, M_COPYALL, M_NOWAIT);
6336 #ifdef SCTP_MBUF_LOGGING
6337                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
6338                                 struct mbuf *mat;
6339
6340                                 for (mat = appendchain; mat; mat = SCTP_BUF_NEXT(mat)) {
6341                                         if (SCTP_BUF_IS_EXTENDED(mat)) {
6342                                                 sctp_log_mb(mat, SCTP_MBUF_ICOPY);
6343                                         }
6344                                 }
6345                         }
6346 #endif
6347                 }
6348         }
6349         if (appendchain == NULL) {
6350                 /* error */
6351                 if (outchain)
6352                         sctp_m_freem(outchain);
6353                 return (NULL);
6354         }
6355         if (outchain) {
6356                 /* tack on to the end */
6357                 if (*endofchain != NULL) {
6358                         SCTP_BUF_NEXT(((*endofchain))) = appendchain;
6359                 } else {
6360                         m = outchain;
6361                         while (m) {
6362                                 if (SCTP_BUF_NEXT(m) == NULL) {
6363                                         SCTP_BUF_NEXT(m) = appendchain;
6364                                         break;
6365                                 }
6366                                 m = SCTP_BUF_NEXT(m);
6367                         }
6368                 }
6369                 /*
6370                  * save off the end and update the end-chain postion
6371                  */
6372                 m = appendchain;
6373                 while (m) {
6374                         if (SCTP_BUF_NEXT(m) == NULL) {
6375                                 *endofchain = m;
6376                                 break;
6377                         }
6378                         m = SCTP_BUF_NEXT(m);
6379                 }
6380                 return (outchain);
6381         } else {
6382                 /* save off the end and update the end-chain postion */
6383                 m = appendchain;
6384                 while (m) {
6385                         if (SCTP_BUF_NEXT(m) == NULL) {
6386                                 *endofchain = m;
6387                                 break;
6388                         }
6389                         m = SCTP_BUF_NEXT(m);
6390                 }
6391                 return (appendchain);
6392         }
6393 }
6394
6395 static int
6396 sctp_med_chunk_output(struct sctp_inpcb *inp,
6397     struct sctp_tcb *stcb,
6398     struct sctp_association *asoc,
6399     int *num_out,
6400     int *reason_code,
6401     int control_only, int from_where,
6402     struct timeval *now, int *now_filled, int frag_point, int so_locked
6403 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
6404     SCTP_UNUSED
6405 #endif
6406 );
6407
6408 static void
6409 sctp_sendall_iterator(struct sctp_inpcb *inp, struct sctp_tcb *stcb, void *ptr,
6410     uint32_t val SCTP_UNUSED)
6411 {
6412         struct sctp_copy_all *ca;
6413         struct mbuf *m;
6414         int ret = 0;
6415         int added_control = 0;
6416         int un_sent, do_chunk_output = 1;
6417         struct sctp_association *asoc;
6418         struct sctp_nets *net;
6419
6420         ca = (struct sctp_copy_all *)ptr;
6421         if (ca->m == NULL) {
6422                 return;
6423         }
6424         if (ca->inp != inp) {
6425                 /* TSNH */
6426                 return;
6427         }
6428         if (ca->sndlen > 0) {
6429                 m = SCTP_M_COPYM(ca->m, 0, M_COPYALL, M_NOWAIT);
6430                 if (m == NULL) {
6431                         /* can't copy so we are done */
6432                         ca->cnt_failed++;
6433                         return;
6434                 }
6435 #ifdef SCTP_MBUF_LOGGING
6436                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
6437                         struct mbuf *mat;
6438
6439                         for (mat = m; mat; mat = SCTP_BUF_NEXT(mat)) {
6440                                 if (SCTP_BUF_IS_EXTENDED(mat)) {
6441                                         sctp_log_mb(mat, SCTP_MBUF_ICOPY);
6442                                 }
6443                         }
6444                 }
6445 #endif
6446         } else {
6447                 m = NULL;
6448         }
6449         SCTP_TCB_LOCK_ASSERT(stcb);
6450         if (stcb->asoc.alternate) {
6451                 net = stcb->asoc.alternate;
6452         } else {
6453                 net = stcb->asoc.primary_destination;
6454         }
6455         if (ca->sndrcv.sinfo_flags & SCTP_ABORT) {
6456                 /* Abort this assoc with m as the user defined reason */
6457                 if (m != NULL) {
6458                         SCTP_BUF_PREPEND(m, sizeof(struct sctp_paramhdr), M_NOWAIT);
6459                 } else {
6460                         m = sctp_get_mbuf_for_msg(sizeof(struct sctp_paramhdr),
6461                             0, M_NOWAIT, 1, MT_DATA);
6462                         SCTP_BUF_LEN(m) = sizeof(struct sctp_paramhdr);
6463                 }
6464                 if (m != NULL) {
6465                         struct sctp_paramhdr *ph;
6466
6467                         ph = mtod(m, struct sctp_paramhdr *);
6468                         ph->param_type = htons(SCTP_CAUSE_USER_INITIATED_ABT);
6469                         ph->param_length = htons(sizeof(struct sctp_paramhdr) + ca->sndlen);
6470                 }
6471                 /*
6472                  * We add one here to keep the assoc from dis-appearing on
6473                  * us.
6474                  */
6475                 atomic_add_int(&stcb->asoc.refcnt, 1);
6476                 sctp_abort_an_association(inp, stcb, m, SCTP_SO_NOT_LOCKED);
6477                 /*
6478                  * sctp_abort_an_association calls sctp_free_asoc() free
6479                  * association will NOT free it since we incremented the
6480                  * refcnt .. we do this to prevent it being freed and things
6481                  * getting tricky since we could end up (from free_asoc)
6482                  * calling inpcb_free which would get a recursive lock call
6483                  * to the iterator lock.. But as a consequence of that the
6484                  * stcb will return to us un-locked.. since free_asoc
6485                  * returns with either no TCB or the TCB unlocked, we must
6486                  * relock.. to unlock in the iterator timer :-0
6487                  */
6488                 SCTP_TCB_LOCK(stcb);
6489                 atomic_add_int(&stcb->asoc.refcnt, -1);
6490                 goto no_chunk_output;
6491         } else {
6492                 if (m) {
6493                         ret = sctp_msg_append(stcb, net, m,
6494                             &ca->sndrcv, 1);
6495                 }
6496                 asoc = &stcb->asoc;
6497                 if (ca->sndrcv.sinfo_flags & SCTP_EOF) {
6498                         /* shutdown this assoc */
6499                         int cnt;
6500
6501                         cnt = sctp_is_there_unsent_data(stcb, SCTP_SO_NOT_LOCKED);
6502
6503                         if (TAILQ_EMPTY(&asoc->send_queue) &&
6504                             TAILQ_EMPTY(&asoc->sent_queue) &&
6505                             (cnt == 0)) {
6506                                 if (asoc->locked_on_sending) {
6507                                         goto abort_anyway;
6508                                 }
6509                                 /*
6510                                  * there is nothing queued to send, so I'm
6511                                  * done...
6512                                  */
6513                                 if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) &&
6514                                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
6515                                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
6516                                         /*
6517                                          * only send SHUTDOWN the first time
6518                                          * through
6519                                          */
6520                                         if (SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) {
6521                                                 SCTP_STAT_DECR_GAUGE32(sctps_currestab);
6522                                         }
6523                                         SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_SENT);
6524                                         SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING);
6525                                         sctp_stop_timers_for_shutdown(stcb);
6526                                         sctp_send_shutdown(stcb, net);
6527                                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb,
6528                                             net);
6529                                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
6530                                             asoc->primary_destination);
6531                                         added_control = 1;
6532                                         do_chunk_output = 0;
6533                                 }
6534                         } else {
6535                                 /*
6536                                  * we still got (or just got) data to send,
6537                                  * so set SHUTDOWN_PENDING
6538                                  */
6539                                 /*
6540                                  * XXX sockets draft says that SCTP_EOF
6541                                  * should be sent with no data.  currently,
6542                                  * we will allow user data to be sent first
6543                                  * and move to SHUTDOWN-PENDING
6544                                  */
6545                                 if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) &&
6546                                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
6547                                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
6548                                         if (asoc->locked_on_sending) {
6549                                                 /*
6550                                                  * Locked to send out the
6551                                                  * data
6552                                                  */
6553                                                 struct sctp_stream_queue_pending *sp;
6554
6555                                                 sp = TAILQ_LAST(&asoc->locked_on_sending->outqueue, sctp_streamhead);
6556                                                 if (sp) {
6557                                                         if ((sp->length == 0) && (sp->msg_is_complete == 0))
6558                                                                 asoc->state |= SCTP_STATE_PARTIAL_MSG_LEFT;
6559                                                 }
6560                                         }
6561                                         asoc->state |= SCTP_STATE_SHUTDOWN_PENDING;
6562                                         if (TAILQ_EMPTY(&asoc->send_queue) &&
6563                                             TAILQ_EMPTY(&asoc->sent_queue) &&
6564                                             (asoc->state & SCTP_STATE_PARTIAL_MSG_LEFT)) {
6565                                 abort_anyway:
6566                                                 atomic_add_int(&stcb->asoc.refcnt, 1);
6567                                                 sctp_abort_an_association(stcb->sctp_ep, stcb,
6568                                                     NULL, SCTP_SO_NOT_LOCKED);
6569                                                 atomic_add_int(&stcb->asoc.refcnt, -1);
6570                                                 goto no_chunk_output;
6571                                         }
6572                                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
6573                                             asoc->primary_destination);
6574                                 }
6575                         }
6576
6577                 }
6578         }
6579         un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
6580             (stcb->asoc.stream_queue_cnt * sizeof(struct sctp_data_chunk)));
6581
6582         if ((sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY)) &&
6583             (stcb->asoc.total_flight > 0) &&
6584             (un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD))) {
6585                 do_chunk_output = 0;
6586         }
6587         if (do_chunk_output)
6588                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_NOT_LOCKED);
6589         else if (added_control) {
6590                 int num_out = 0, reason = 0, now_filled = 0;
6591                 struct timeval now;
6592                 int frag_point;
6593
6594                 frag_point = sctp_get_frag_point(stcb, &stcb->asoc);
6595                 (void)sctp_med_chunk_output(inp, stcb, &stcb->asoc, &num_out,
6596                     &reason, 1, 1, &now, &now_filled, frag_point, SCTP_SO_NOT_LOCKED);
6597         }
6598 no_chunk_output:
6599         if (ret) {
6600                 ca->cnt_failed++;
6601         } else {
6602                 ca->cnt_sent++;
6603         }
6604 }
6605
6606 static void
6607 sctp_sendall_completes(void *ptr, uint32_t val SCTP_UNUSED)
6608 {
6609         struct sctp_copy_all *ca;
6610
6611         ca = (struct sctp_copy_all *)ptr;
6612         /*
6613          * Do a notify here? Kacheong suggests that the notify be done at
6614          * the send time.. so you would push up a notification if any send
6615          * failed. Don't know if this is feasable since the only failures we
6616          * have is "memory" related and if you cannot get an mbuf to send
6617          * the data you surely can't get an mbuf to send up to notify the
6618          * user you can't send the data :->
6619          */
6620
6621         /* now free everything */
6622         sctp_m_freem(ca->m);
6623         SCTP_FREE(ca, SCTP_M_COPYAL);
6624 }
6625
6626
6627 #define MC_ALIGN(m, len) do {                                           \
6628         SCTP_BUF_RESV_UF(m, ((MCLBYTES - (len)) & ~(sizeof(long) - 1)); \
6629 } while (0)
6630
6631
6632
6633 static struct mbuf *
6634 sctp_copy_out_all(struct uio *uio, int len)
6635 {
6636         struct mbuf *ret, *at;
6637         int left, willcpy, cancpy, error;
6638
6639         ret = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_WAITOK, 1, MT_DATA);
6640         if (ret == NULL) {
6641                 /* TSNH */
6642                 return (NULL);
6643         }
6644         left = len;
6645         SCTP_BUF_LEN(ret) = 0;
6646         /* save space for the data chunk header */
6647         cancpy = M_TRAILINGSPACE(ret);
6648         willcpy = min(cancpy, left);
6649         at = ret;
6650         while (left > 0) {
6651                 /* Align data to the end */
6652                 error = uiomove(mtod(at, caddr_t), willcpy, uio);
6653                 if (error) {
6654         err_out_now:
6655                         sctp_m_freem(at);
6656                         return (NULL);
6657                 }
6658                 SCTP_BUF_LEN(at) = willcpy;
6659                 SCTP_BUF_NEXT_PKT(at) = SCTP_BUF_NEXT(at) = 0;
6660                 left -= willcpy;
6661                 if (left > 0) {
6662                         SCTP_BUF_NEXT(at) = sctp_get_mbuf_for_msg(left, 0, M_WAITOK, 1, MT_DATA);
6663                         if (SCTP_BUF_NEXT(at) == NULL) {
6664                                 goto err_out_now;
6665                         }
6666                         at = SCTP_BUF_NEXT(at);
6667                         SCTP_BUF_LEN(at) = 0;
6668                         cancpy = M_TRAILINGSPACE(at);
6669                         willcpy = min(cancpy, left);
6670                 }
6671         }
6672         return (ret);
6673 }
6674
6675 static int
6676 sctp_sendall(struct sctp_inpcb *inp, struct uio *uio, struct mbuf *m,
6677     struct sctp_sndrcvinfo *srcv)
6678 {
6679         int ret;
6680         struct sctp_copy_all *ca;
6681
6682         SCTP_MALLOC(ca, struct sctp_copy_all *, sizeof(struct sctp_copy_all),
6683             SCTP_M_COPYAL);
6684         if (ca == NULL) {
6685                 sctp_m_freem(m);
6686                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
6687                 return (ENOMEM);
6688         }
6689         memset(ca, 0, sizeof(struct sctp_copy_all));
6690
6691         ca->inp = inp;
6692         if (srcv) {
6693                 memcpy(&ca->sndrcv, srcv, sizeof(struct sctp_nonpad_sndrcvinfo));
6694         }
6695         /*
6696          * take off the sendall flag, it would be bad if we failed to do
6697          * this :-0
6698          */
6699         ca->sndrcv.sinfo_flags &= ~SCTP_SENDALL;
6700         /* get length and mbuf chain */
6701         if (uio) {
6702                 ca->sndlen = uio->uio_resid;
6703                 ca->m = sctp_copy_out_all(uio, ca->sndlen);
6704                 if (ca->m == NULL) {
6705                         SCTP_FREE(ca, SCTP_M_COPYAL);
6706                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
6707                         return (ENOMEM);
6708                 }
6709         } else {
6710                 /* Gather the length of the send */
6711                 struct mbuf *mat;
6712
6713                 ca->sndlen = 0;
6714                 for (mat = m; mat; mat = SCTP_BUF_NEXT(mat)) {
6715                         ca->sndlen += SCTP_BUF_LEN(mat);
6716                 }
6717         }
6718         ret = sctp_initiate_iterator(NULL, sctp_sendall_iterator, NULL,
6719             SCTP_PCB_ANY_FLAGS, SCTP_PCB_ANY_FEATURES,
6720             SCTP_ASOC_ANY_STATE,
6721             (void *)ca, 0,
6722             sctp_sendall_completes, inp, 1);
6723         if (ret) {
6724                 SCTP_PRINTF("Failed to initiate iterator for sendall\n");
6725                 SCTP_FREE(ca, SCTP_M_COPYAL);
6726                 SCTP_LTRACE_ERR_RET_PKT(m, inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EFAULT);
6727                 return (EFAULT);
6728         }
6729         return (0);
6730 }
6731
6732
6733 void
6734 sctp_toss_old_cookies(struct sctp_tcb *stcb, struct sctp_association *asoc)
6735 {
6736         struct sctp_tmit_chunk *chk, *nchk;
6737
6738         TAILQ_FOREACH_SAFE(chk, &asoc->control_send_queue, sctp_next, nchk) {
6739                 if (chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
6740                         TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
6741                         if (chk->data) {
6742                                 sctp_m_freem(chk->data);
6743                                 chk->data = NULL;
6744                         }
6745                         asoc->ctrl_queue_cnt--;
6746                         sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
6747                 }
6748         }
6749 }
6750
6751 void
6752 sctp_toss_old_asconf(struct sctp_tcb *stcb)
6753 {
6754         struct sctp_association *asoc;
6755         struct sctp_tmit_chunk *chk, *nchk;
6756         struct sctp_asconf_chunk *acp;
6757
6758         asoc = &stcb->asoc;
6759         TAILQ_FOREACH_SAFE(chk, &asoc->asconf_send_queue, sctp_next, nchk) {
6760                 /* find SCTP_ASCONF chunk in queue */
6761                 if (chk->rec.chunk_id.id == SCTP_ASCONF) {
6762                         if (chk->data) {
6763                                 acp = mtod(chk->data, struct sctp_asconf_chunk *);
6764                                 if (SCTP_TSN_GT(ntohl(acp->serial_number), asoc->asconf_seq_out_acked)) {
6765                                         /* Not Acked yet */
6766                                         break;
6767                                 }
6768                         }
6769                         TAILQ_REMOVE(&asoc->asconf_send_queue, chk, sctp_next);
6770                         if (chk->data) {
6771                                 sctp_m_freem(chk->data);
6772                                 chk->data = NULL;
6773                         }
6774                         asoc->ctrl_queue_cnt--;
6775                         sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
6776                 }
6777         }
6778 }
6779
6780
6781 static void
6782 sctp_clean_up_datalist(struct sctp_tcb *stcb,
6783     struct sctp_association *asoc,
6784     struct sctp_tmit_chunk **data_list,
6785     int bundle_at,
6786     struct sctp_nets *net)
6787 {
6788         int i;
6789         struct sctp_tmit_chunk *tp1;
6790
6791         for (i = 0; i < bundle_at; i++) {
6792                 /* off of the send queue */
6793                 TAILQ_REMOVE(&asoc->send_queue, data_list[i], sctp_next);
6794                 asoc->send_queue_cnt--;
6795                 if (i > 0) {
6796                         /*
6797                          * Any chunk NOT 0 you zap the time chunk 0 gets
6798                          * zapped or set based on if a RTO measurment is
6799                          * needed.
6800                          */
6801                         data_list[i]->do_rtt = 0;
6802                 }
6803                 /* record time */
6804                 data_list[i]->sent_rcv_time = net->last_sent_time;
6805                 data_list[i]->rec.data.cwnd_at_send = net->cwnd;
6806                 data_list[i]->rec.data.fast_retran_tsn = data_list[i]->rec.data.TSN_seq;
6807                 if (data_list[i]->whoTo == NULL) {
6808                         data_list[i]->whoTo = net;
6809                         atomic_add_int(&net->ref_count, 1);
6810                 }
6811                 /* on to the sent queue */
6812                 tp1 = TAILQ_LAST(&asoc->sent_queue, sctpchunk_listhead);
6813                 if ((tp1) && SCTP_TSN_GT(tp1->rec.data.TSN_seq, data_list[i]->rec.data.TSN_seq)) {
6814                         struct sctp_tmit_chunk *tpp;
6815
6816                         /* need to move back */
6817         back_up_more:
6818                         tpp = TAILQ_PREV(tp1, sctpchunk_listhead, sctp_next);
6819                         if (tpp == NULL) {
6820                                 TAILQ_INSERT_BEFORE(tp1, data_list[i], sctp_next);
6821                                 goto all_done;
6822                         }
6823                         tp1 = tpp;
6824                         if (SCTP_TSN_GT(tp1->rec.data.TSN_seq, data_list[i]->rec.data.TSN_seq)) {
6825                                 goto back_up_more;
6826                         }
6827                         TAILQ_INSERT_AFTER(&asoc->sent_queue, tp1, data_list[i], sctp_next);
6828                 } else {
6829                         TAILQ_INSERT_TAIL(&asoc->sent_queue,
6830                             data_list[i],
6831                             sctp_next);
6832                 }
6833 all_done:
6834                 /* This does not lower until the cum-ack passes it */
6835                 asoc->sent_queue_cnt++;
6836                 if ((asoc->peers_rwnd <= 0) &&
6837                     (asoc->total_flight == 0) &&
6838                     (bundle_at == 1)) {
6839                         /* Mark the chunk as being a window probe */
6840                         SCTP_STAT_INCR(sctps_windowprobed);
6841                 }
6842 #ifdef SCTP_AUDITING_ENABLED
6843                 sctp_audit_log(0xC2, 3);
6844 #endif
6845                 data_list[i]->sent = SCTP_DATAGRAM_SENT;
6846                 data_list[i]->snd_count = 1;
6847                 data_list[i]->rec.data.chunk_was_revoked = 0;
6848                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
6849                         sctp_misc_ints(SCTP_FLIGHT_LOG_UP,
6850                             data_list[i]->whoTo->flight_size,
6851                             data_list[i]->book_size,
6852                             (uintptr_t) data_list[i]->whoTo,
6853                             data_list[i]->rec.data.TSN_seq);
6854                 }
6855                 sctp_flight_size_increase(data_list[i]);
6856                 sctp_total_flight_increase(stcb, data_list[i]);
6857                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_RWND_ENABLE) {
6858                         sctp_log_rwnd(SCTP_DECREASE_PEER_RWND,
6859                             asoc->peers_rwnd, data_list[i]->send_size, SCTP_BASE_SYSCTL(sctp_peer_chunk_oh));
6860                 }
6861                 asoc->peers_rwnd = sctp_sbspace_sub(asoc->peers_rwnd,
6862                     (uint32_t) (data_list[i]->send_size + SCTP_BASE_SYSCTL(sctp_peer_chunk_oh)));
6863                 if (asoc->peers_rwnd < stcb->sctp_ep->sctp_ep.sctp_sws_sender) {
6864                         /* SWS sender side engages */
6865                         asoc->peers_rwnd = 0;
6866                 }
6867         }
6868         if (asoc->cc_functions.sctp_cwnd_update_packet_transmitted) {
6869                 (*asoc->cc_functions.sctp_cwnd_update_packet_transmitted) (stcb, net);
6870         }
6871 }
6872
6873 static void
6874 sctp_clean_up_ctl(struct sctp_tcb *stcb, struct sctp_association *asoc, int so_locked
6875 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
6876     SCTP_UNUSED
6877 #endif
6878 )
6879 {
6880         struct sctp_tmit_chunk *chk, *nchk;
6881
6882         TAILQ_FOREACH_SAFE(chk, &asoc->control_send_queue, sctp_next, nchk) {
6883                 if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
6884                     (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK) ||  /* EY */
6885                     (chk->rec.chunk_id.id == SCTP_HEARTBEAT_REQUEST) ||
6886                     (chk->rec.chunk_id.id == SCTP_HEARTBEAT_ACK) ||
6887                     (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN) ||
6888                     (chk->rec.chunk_id.id == SCTP_SHUTDOWN) ||
6889                     (chk->rec.chunk_id.id == SCTP_SHUTDOWN_ACK) ||
6890                     (chk->rec.chunk_id.id == SCTP_OPERATION_ERROR) ||
6891                     (chk->rec.chunk_id.id == SCTP_PACKET_DROPPED) ||
6892                     (chk->rec.chunk_id.id == SCTP_COOKIE_ACK) ||
6893                     (chk->rec.chunk_id.id == SCTP_ECN_CWR) ||
6894                     (chk->rec.chunk_id.id == SCTP_ASCONF_ACK)) {
6895                         /* Stray chunks must be cleaned up */
6896         clean_up_anyway:
6897                         TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
6898                         if (chk->data) {
6899                                 sctp_m_freem(chk->data);
6900                                 chk->data = NULL;
6901                         }
6902                         asoc->ctrl_queue_cnt--;
6903                         if (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN)
6904                                 asoc->fwd_tsn_cnt--;
6905                         sctp_free_a_chunk(stcb, chk, so_locked);
6906                 } else if (chk->rec.chunk_id.id == SCTP_STREAM_RESET) {
6907                         /* special handling, we must look into the param */
6908                         if (chk != asoc->str_reset) {
6909                                 goto clean_up_anyway;
6910                         }
6911                 }
6912         }
6913 }
6914
6915
6916 static int
6917 sctp_can_we_split_this(struct sctp_tcb *stcb,
6918     uint32_t length,
6919     uint32_t goal_mtu, uint32_t frag_point, int eeor_on)
6920 {
6921         /*
6922          * Make a decision on if I should split a msg into multiple parts.
6923          * This is only asked of incomplete messages.
6924          */
6925         if (eeor_on) {
6926                 /*
6927                  * If we are doing EEOR we need to always send it if its the
6928                  * entire thing, since it might be all the guy is putting in
6929                  * the hopper.
6930                  */
6931                 if (goal_mtu >= length) {
6932                         /*-
6933                          * If we have data outstanding,
6934                          * we get another chance when the sack
6935                          * arrives to transmit - wait for more data
6936                          */
6937                         if (stcb->asoc.total_flight == 0) {
6938                                 /*
6939                                  * If nothing is in flight, we zero the
6940                                  * packet counter.
6941                                  */
6942                                 return (length);
6943                         }
6944                         return (0);
6945
6946                 } else {
6947                         /* You can fill the rest */
6948                         return (goal_mtu);
6949                 }
6950         }
6951         /*-
6952          * For those strange folk that make the send buffer
6953          * smaller than our fragmentation point, we can't
6954          * get a full msg in so we have to allow splitting.
6955          */
6956         if (SCTP_SB_LIMIT_SND(stcb->sctp_socket) < frag_point) {
6957                 return (length);
6958         }
6959         if ((length <= goal_mtu) ||
6960             ((length - goal_mtu) < SCTP_BASE_SYSCTL(sctp_min_residual))) {
6961                 /* Sub-optimial residual don't split in non-eeor mode. */
6962                 return (0);
6963         }
6964         /*
6965          * If we reach here length is larger than the goal_mtu. Do we wish
6966          * to split it for the sake of packet putting together?
6967          */
6968         if (goal_mtu >= min(SCTP_BASE_SYSCTL(sctp_min_split_point), frag_point)) {
6969                 /* Its ok to split it */
6970                 return (min(goal_mtu, frag_point));
6971         }
6972         /* Nope, can't split */
6973         return (0);
6974
6975 }
6976
6977 static uint32_t
6978 sctp_move_to_outqueue(struct sctp_tcb *stcb,
6979     struct sctp_stream_out *strq,
6980     uint32_t goal_mtu,
6981     uint32_t frag_point,
6982     int *locked,
6983     int *giveup,
6984     int eeor_mode,
6985     int *bail,
6986     int so_locked
6987 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
6988     SCTP_UNUSED
6989 #endif
6990 )
6991 {
6992         /* Move from the stream to the send_queue keeping track of the total */
6993         struct sctp_association *asoc;
6994         struct sctp_stream_queue_pending *sp;
6995         struct sctp_tmit_chunk *chk;
6996         struct sctp_data_chunk *dchkh;
6997         uint32_t to_move, length;
6998         uint8_t rcv_flags = 0;
6999         uint8_t some_taken;
7000         uint8_t send_lock_up = 0;
7001
7002         SCTP_TCB_LOCK_ASSERT(stcb);
7003         asoc = &stcb->asoc;
7004 one_more_time:
7005         /* sa_ignore FREED_MEMORY */
7006         sp = TAILQ_FIRST(&strq->outqueue);
7007         if (sp == NULL) {
7008                 *locked = 0;
7009                 if (send_lock_up == 0) {
7010                         SCTP_TCB_SEND_LOCK(stcb);
7011                         send_lock_up = 1;
7012                 }
7013                 sp = TAILQ_FIRST(&strq->outqueue);
7014                 if (sp) {
7015                         goto one_more_time;
7016                 }
7017                 if (strq->last_msg_incomplete) {
7018                         SCTP_PRINTF("Huh? Stream:%d lm_in_c=%d but queue is NULL\n",
7019                             strq->stream_no,
7020                             strq->last_msg_incomplete);
7021                         strq->last_msg_incomplete = 0;
7022                 }
7023                 to_move = 0;
7024                 if (send_lock_up) {
7025                         SCTP_TCB_SEND_UNLOCK(stcb);
7026                         send_lock_up = 0;
7027                 }
7028                 goto out_of;
7029         }
7030         if ((sp->msg_is_complete) && (sp->length == 0)) {
7031                 if (sp->sender_all_done) {
7032                         /*
7033                          * We are doing differed cleanup. Last time through
7034                          * when we took all the data the sender_all_done was
7035                          * not set.
7036                          */
7037                         if ((sp->put_last_out == 0) && (sp->discard_rest == 0)) {
7038                                 SCTP_PRINTF("Gak, put out entire msg with NO end!-1\n");
7039                                 SCTP_PRINTF("sender_done:%d len:%d msg_comp:%d put_last_out:%d send_lock:%d\n",
7040                                     sp->sender_all_done,
7041                                     sp->length,
7042                                     sp->msg_is_complete,
7043                                     sp->put_last_out,
7044                                     send_lock_up);
7045                         }
7046                         if ((TAILQ_NEXT(sp, next) == NULL) && (send_lock_up == 0)) {
7047                                 SCTP_TCB_SEND_LOCK(stcb);
7048                                 send_lock_up = 1;
7049                         }
7050                         atomic_subtract_int(&asoc->stream_queue_cnt, 1);
7051                         TAILQ_REMOVE(&strq->outqueue, sp, next);
7052                         stcb->asoc.ss_functions.sctp_ss_remove_from_stream(stcb, asoc, strq, sp, send_lock_up);
7053                         if (sp->net) {
7054                                 sctp_free_remote_addr(sp->net);
7055                                 sp->net = NULL;
7056                         }
7057                         if (sp->data) {
7058                                 sctp_m_freem(sp->data);
7059                                 sp->data = NULL;
7060                         }
7061                         sctp_free_a_strmoq(stcb, sp, so_locked);
7062                         /* we can't be locked to it */
7063                         *locked = 0;
7064                         stcb->asoc.locked_on_sending = NULL;
7065                         if (send_lock_up) {
7066                                 SCTP_TCB_SEND_UNLOCK(stcb);
7067                                 send_lock_up = 0;
7068                         }
7069                         /* back to get the next msg */
7070                         goto one_more_time;
7071                 } else {
7072                         /*
7073                          * sender just finished this but still holds a
7074                          * reference
7075                          */
7076                         *locked = 1;
7077                         *giveup = 1;
7078                         to_move = 0;
7079                         goto out_of;
7080                 }
7081         } else {
7082                 /* is there some to get */
7083                 if (sp->length == 0) {
7084                         /* no */
7085                         *locked = 1;
7086                         *giveup = 1;
7087                         to_move = 0;
7088                         goto out_of;
7089                 } else if (sp->discard_rest) {
7090                         if (send_lock_up == 0) {
7091                                 SCTP_TCB_SEND_LOCK(stcb);
7092                                 send_lock_up = 1;
7093                         }
7094                         /* Whack down the size */
7095                         atomic_subtract_int(&stcb->asoc.total_output_queue_size, sp->length);
7096                         if ((stcb->sctp_socket != NULL) && \
7097                             ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
7098                             (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL))) {
7099                                 atomic_subtract_int(&stcb->sctp_socket->so_snd.sb_cc, sp->length);
7100                         }
7101                         if (sp->data) {
7102                                 sctp_m_freem(sp->data);
7103                                 sp->data = NULL;
7104                                 sp->tail_mbuf = NULL;
7105                         }
7106                         sp->length = 0;
7107                         sp->some_taken = 1;
7108                         *locked = 1;
7109                         *giveup = 1;
7110                         to_move = 0;
7111                         goto out_of;
7112                 }
7113         }
7114         some_taken = sp->some_taken;
7115         if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
7116                 sp->msg_is_complete = 1;
7117         }
7118 re_look:
7119         length = sp->length;
7120         if (sp->msg_is_complete) {
7121                 /* The message is complete */
7122                 to_move = min(length, frag_point);
7123                 if (to_move == length) {
7124                         /* All of it fits in the MTU */
7125                         if (sp->some_taken) {
7126                                 rcv_flags |= SCTP_DATA_LAST_FRAG;
7127                                 sp->put_last_out = 1;
7128                         } else {
7129                                 rcv_flags |= SCTP_DATA_NOT_FRAG;
7130                                 sp->put_last_out = 1;
7131                         }
7132                 } else {
7133                         /* Not all of it fits, we fragment */
7134                         if (sp->some_taken == 0) {
7135                                 rcv_flags |= SCTP_DATA_FIRST_FRAG;
7136                         }
7137                         sp->some_taken = 1;
7138                 }
7139         } else {
7140                 to_move = sctp_can_we_split_this(stcb, length, goal_mtu, frag_point, eeor_mode);
7141                 if (to_move) {
7142                         /*-
7143                          * We use a snapshot of length in case it
7144                          * is expanding during the compare.
7145                          */
7146                         uint32_t llen;
7147
7148                         llen = length;
7149                         if (to_move >= llen) {
7150                                 to_move = llen;
7151                                 if (send_lock_up == 0) {
7152                                         /*-
7153                                          * We are taking all of an incomplete msg
7154                                          * thus we need a send lock.
7155                                          */
7156                                         SCTP_TCB_SEND_LOCK(stcb);
7157                                         send_lock_up = 1;
7158                                         if (sp->msg_is_complete) {
7159                                                 /*
7160                                                  * the sender finished the
7161                                                  * msg
7162                                                  */
7163                                                 goto re_look;
7164                                         }
7165                                 }
7166                         }
7167                         if (sp->some_taken == 0) {
7168                                 rcv_flags |= SCTP_DATA_FIRST_FRAG;
7169                                 sp->some_taken = 1;
7170                         }
7171                 } else {
7172                         /* Nothing to take. */
7173                         if (sp->some_taken) {
7174                                 *locked = 1;
7175                         }
7176                         *giveup = 1;
7177                         to_move = 0;
7178                         goto out_of;
7179                 }
7180         }
7181
7182         /* If we reach here, we can copy out a chunk */
7183         sctp_alloc_a_chunk(stcb, chk);
7184         if (chk == NULL) {
7185                 /* No chunk memory */
7186                 *giveup = 1;
7187                 to_move = 0;
7188                 goto out_of;
7189         }
7190         /*
7191          * Setup for unordered if needed by looking at the user sent info
7192          * flags.
7193          */
7194         if (sp->sinfo_flags & SCTP_UNORDERED) {
7195                 rcv_flags |= SCTP_DATA_UNORDERED;
7196         }
7197         if ((SCTP_BASE_SYSCTL(sctp_enable_sack_immediately) && ((sp->sinfo_flags & SCTP_EOF) == SCTP_EOF)) ||
7198             ((sp->sinfo_flags & SCTP_SACK_IMMEDIATELY) == SCTP_SACK_IMMEDIATELY)) {
7199                 rcv_flags |= SCTP_DATA_SACK_IMMEDIATELY;
7200         }
7201         /* clear out the chunk before setting up */
7202         memset(chk, 0, sizeof(*chk));
7203         chk->rec.data.rcv_flags = rcv_flags;
7204
7205         if (to_move >= length) {
7206                 /* we think we can steal the whole thing */
7207                 if ((sp->sender_all_done == 0) && (send_lock_up == 0)) {
7208                         SCTP_TCB_SEND_LOCK(stcb);
7209                         send_lock_up = 1;
7210                 }
7211                 if (to_move < sp->length) {
7212                         /* bail, it changed */
7213                         goto dont_do_it;
7214                 }
7215                 chk->data = sp->data;
7216                 chk->last_mbuf = sp->tail_mbuf;
7217                 /* register the stealing */
7218                 sp->data = sp->tail_mbuf = NULL;
7219         } else {
7220                 struct mbuf *m;
7221
7222 dont_do_it:
7223                 chk->data = SCTP_M_COPYM(sp->data, 0, to_move, M_NOWAIT);
7224                 chk->last_mbuf = NULL;
7225                 if (chk->data == NULL) {
7226                         sp->some_taken = some_taken;
7227                         sctp_free_a_chunk(stcb, chk, so_locked);
7228                         *bail = 1;
7229                         to_move = 0;
7230                         goto out_of;
7231                 }
7232 #ifdef SCTP_MBUF_LOGGING
7233                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
7234                         struct mbuf *mat;
7235
7236                         for (mat = chk->data; mat; mat = SCTP_BUF_NEXT(mat)) {
7237                                 if (SCTP_BUF_IS_EXTENDED(mat)) {
7238                                         sctp_log_mb(mat, SCTP_MBUF_ICOPY);
7239                                 }
7240                         }
7241                 }
7242 #endif
7243                 /* Pull off the data */
7244                 m_adj(sp->data, to_move);
7245                 /* Now lets work our way down and compact it */
7246                 m = sp->data;
7247                 while (m && (SCTP_BUF_LEN(m) == 0)) {
7248                         sp->data = SCTP_BUF_NEXT(m);
7249                         SCTP_BUF_NEXT(m) = NULL;
7250                         if (sp->tail_mbuf == m) {
7251                                 /*-
7252                                  * Freeing tail? TSNH since
7253                                  * we supposedly were taking less
7254                                  * than the sp->length.
7255                                  */
7256 #ifdef INVARIANTS
7257                                 panic("Huh, freing tail? - TSNH");
7258 #else
7259                                 SCTP_PRINTF("Huh, freeing tail? - TSNH\n");
7260                                 sp->tail_mbuf = sp->data = NULL;
7261                                 sp->length = 0;
7262 #endif
7263
7264                         }
7265                         sctp_m_free(m);
7266                         m = sp->data;
7267                 }
7268         }
7269         if (SCTP_BUF_IS_EXTENDED(chk->data)) {
7270                 chk->copy_by_ref = 1;
7271         } else {
7272                 chk->copy_by_ref = 0;
7273         }
7274         /*
7275          * get last_mbuf and counts of mb useage This is ugly but hopefully
7276          * its only one mbuf.
7277          */
7278         if (chk->last_mbuf == NULL) {
7279                 chk->last_mbuf = chk->data;
7280                 while (SCTP_BUF_NEXT(chk->last_mbuf) != NULL) {
7281                         chk->last_mbuf = SCTP_BUF_NEXT(chk->last_mbuf);
7282                 }
7283         }
7284         if (to_move > length) {
7285                 /*- This should not happen either
7286                  * since we always lower to_move to the size
7287                  * of sp->length if its larger.
7288                  */
7289 #ifdef INVARIANTS
7290                 panic("Huh, how can to_move be larger?");
7291 #else
7292                 SCTP_PRINTF("Huh, how can to_move be larger?\n");
7293                 sp->length = 0;
7294 #endif
7295         } else {
7296                 atomic_subtract_int(&sp->length, to_move);
7297         }
7298         if (M_LEADINGSPACE(chk->data) < (int)sizeof(struct sctp_data_chunk)) {
7299                 /* Not enough room for a chunk header, get some */
7300                 struct mbuf *m;
7301
7302                 m = sctp_get_mbuf_for_msg(1, 0, M_NOWAIT, 0, MT_DATA);
7303                 if (m == NULL) {
7304                         /*
7305                          * we're in trouble here. _PREPEND below will free
7306                          * all the data if there is no leading space, so we
7307                          * must put the data back and restore.
7308                          */
7309                         if (send_lock_up == 0) {
7310                                 SCTP_TCB_SEND_LOCK(stcb);
7311                                 send_lock_up = 1;
7312                         }
7313                         if (chk->data == NULL) {
7314                                 /* unsteal the data */
7315                                 sp->data = chk->data;
7316                                 sp->tail_mbuf = chk->last_mbuf;
7317                         } else {
7318                                 struct mbuf *m_tmp;
7319
7320                                 /* reassemble the data */
7321                                 m_tmp = sp->data;
7322                                 sp->data = chk->data;
7323                                 SCTP_BUF_NEXT(chk->last_mbuf) = m_tmp;
7324                         }
7325                         sp->some_taken = some_taken;
7326                         atomic_add_int(&sp->length, to_move);
7327                         chk->data = NULL;
7328                         *bail = 1;
7329                         sctp_free_a_chunk(stcb, chk, so_locked);
7330                         to_move = 0;
7331                         goto out_of;
7332                 } else {
7333                         SCTP_BUF_LEN(m) = 0;
7334                         SCTP_BUF_NEXT(m) = chk->data;
7335                         chk->data = m;
7336                         M_ALIGN(chk->data, 4);
7337                 }
7338         }
7339         SCTP_BUF_PREPEND(chk->data, sizeof(struct sctp_data_chunk), M_NOWAIT);
7340         if (chk->data == NULL) {
7341                 /* HELP, TSNH since we assured it would not above? */
7342 #ifdef INVARIANTS
7343                 panic("prepend failes HELP?");
7344 #else
7345                 SCTP_PRINTF("prepend fails HELP?\n");
7346                 sctp_free_a_chunk(stcb, chk, so_locked);
7347 #endif
7348                 *bail = 1;
7349                 to_move = 0;
7350                 goto out_of;
7351         }
7352         sctp_snd_sb_alloc(stcb, sizeof(struct sctp_data_chunk));
7353         chk->book_size = chk->send_size = (to_move + sizeof(struct sctp_data_chunk));
7354         chk->book_size_scale = 0;
7355         chk->sent = SCTP_DATAGRAM_UNSENT;
7356
7357         chk->flags = 0;
7358         chk->asoc = &stcb->asoc;
7359         chk->pad_inplace = 0;
7360         chk->no_fr_allowed = 0;
7361         chk->rec.data.stream_seq = strq->next_sequence_send;
7362         if (rcv_flags & SCTP_DATA_LAST_FRAG) {
7363                 strq->next_sequence_send++;
7364         }
7365         chk->rec.data.stream_number = sp->stream;
7366         chk->rec.data.payloadtype = sp->ppid;
7367         chk->rec.data.context = sp->context;
7368         chk->rec.data.doing_fast_retransmit = 0;
7369
7370         chk->rec.data.timetodrop = sp->ts;
7371         chk->flags = sp->act_flags;
7372
7373         if (sp->net) {
7374                 chk->whoTo = sp->net;
7375                 atomic_add_int(&chk->whoTo->ref_count, 1);
7376         } else
7377                 chk->whoTo = NULL;
7378
7379         if (sp->holds_key_ref) {
7380                 chk->auth_keyid = sp->auth_keyid;
7381                 sctp_auth_key_acquire(stcb, chk->auth_keyid);
7382                 chk->holds_key_ref = 1;
7383         }
7384         chk->rec.data.TSN_seq = atomic_fetchadd_int(&asoc->sending_seq, 1);
7385         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_AT_SEND_2_OUTQ) {
7386                 sctp_misc_ints(SCTP_STRMOUT_LOG_SEND,
7387                     (uintptr_t) stcb, sp->length,
7388                     (uint32_t) ((chk->rec.data.stream_number << 16) | chk->rec.data.stream_seq),
7389                     chk->rec.data.TSN_seq);
7390         }
7391         dchkh = mtod(chk->data, struct sctp_data_chunk *);
7392         /*
7393          * Put the rest of the things in place now. Size was done earlier in
7394          * previous loop prior to padding.
7395          */
7396
7397 #ifdef SCTP_ASOCLOG_OF_TSNS
7398         SCTP_TCB_LOCK_ASSERT(stcb);
7399         if (asoc->tsn_out_at >= SCTP_TSN_LOG_SIZE) {
7400                 asoc->tsn_out_at = 0;
7401                 asoc->tsn_out_wrapped = 1;
7402         }
7403         asoc->out_tsnlog[asoc->tsn_out_at].tsn = chk->rec.data.TSN_seq;
7404         asoc->out_tsnlog[asoc->tsn_out_at].strm = chk->rec.data.stream_number;
7405         asoc->out_tsnlog[asoc->tsn_out_at].seq = chk->rec.data.stream_seq;
7406         asoc->out_tsnlog[asoc->tsn_out_at].sz = chk->send_size;
7407         asoc->out_tsnlog[asoc->tsn_out_at].flgs = chk->rec.data.rcv_flags;
7408         asoc->out_tsnlog[asoc->tsn_out_at].stcb = (void *)stcb;
7409         asoc->out_tsnlog[asoc->tsn_out_at].in_pos = asoc->tsn_out_at;
7410         asoc->out_tsnlog[asoc->tsn_out_at].in_out = 2;
7411         asoc->tsn_out_at++;
7412 #endif
7413
7414         dchkh->ch.chunk_type = SCTP_DATA;
7415         dchkh->ch.chunk_flags = chk->rec.data.rcv_flags;
7416         dchkh->dp.tsn = htonl(chk->rec.data.TSN_seq);
7417         dchkh->dp.stream_id = htons(strq->stream_no);
7418         dchkh->dp.stream_sequence = htons(chk->rec.data.stream_seq);
7419         dchkh->dp.protocol_id = chk->rec.data.payloadtype;
7420         dchkh->ch.chunk_length = htons(chk->send_size);
7421         /* Now advance the chk->send_size by the actual pad needed. */
7422         if (chk->send_size < SCTP_SIZE32(chk->book_size)) {
7423                 /* need a pad */
7424                 struct mbuf *lm;
7425                 int pads;
7426
7427                 pads = SCTP_SIZE32(chk->book_size) - chk->send_size;
7428                 if (sctp_pad_lastmbuf(chk->data, pads, chk->last_mbuf) == 0) {
7429                         chk->pad_inplace = 1;
7430                 }
7431                 if ((lm = SCTP_BUF_NEXT(chk->last_mbuf)) != NULL) {
7432                         /* pad added an mbuf */
7433                         chk->last_mbuf = lm;
7434                 }
7435                 chk->send_size += pads;
7436         }
7437         if (PR_SCTP_ENABLED(chk->flags)) {
7438                 asoc->pr_sctp_cnt++;
7439         }
7440         if (sp->msg_is_complete && (sp->length == 0) && (sp->sender_all_done)) {
7441                 /* All done pull and kill the message */
7442                 atomic_subtract_int(&asoc->stream_queue_cnt, 1);
7443                 if (sp->put_last_out == 0) {
7444                         SCTP_PRINTF("Gak, put out entire msg with NO end!-2\n");
7445                         SCTP_PRINTF("sender_done:%d len:%d msg_comp:%d put_last_out:%d send_lock:%d\n",
7446                             sp->sender_all_done,
7447                             sp->length,
7448                             sp->msg_is_complete,
7449                             sp->put_last_out,
7450                             send_lock_up);
7451                 }
7452                 if ((send_lock_up == 0) && (TAILQ_NEXT(sp, next) == NULL)) {
7453                         SCTP_TCB_SEND_LOCK(stcb);
7454                         send_lock_up = 1;
7455                 }
7456                 TAILQ_REMOVE(&strq->outqueue, sp, next);
7457                 stcb->asoc.ss_functions.sctp_ss_remove_from_stream(stcb, asoc, strq, sp, send_lock_up);
7458                 if (sp->net) {
7459                         sctp_free_remote_addr(sp->net);
7460                         sp->net = NULL;
7461                 }
7462                 if (sp->data) {
7463                         sctp_m_freem(sp->data);
7464                         sp->data = NULL;
7465                 }
7466                 sctp_free_a_strmoq(stcb, sp, so_locked);
7467
7468                 /* we can't be locked to it */
7469                 *locked = 0;
7470                 stcb->asoc.locked_on_sending = NULL;
7471         } else {
7472                 /* more to go, we are locked */
7473                 *locked = 1;
7474         }
7475         asoc->chunks_on_out_queue++;
7476         strq->chunks_on_queues++;
7477         TAILQ_INSERT_TAIL(&asoc->send_queue, chk, sctp_next);
7478         asoc->send_queue_cnt++;
7479 out_of:
7480         if (send_lock_up) {
7481                 SCTP_TCB_SEND_UNLOCK(stcb);
7482         }
7483         return (to_move);
7484 }
7485
7486
7487 static void
7488 sctp_fill_outqueue(struct sctp_tcb *stcb,
7489     struct sctp_nets *net, int frag_point, int eeor_mode, int *quit_now, int so_locked
7490 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
7491     SCTP_UNUSED
7492 #endif
7493 )
7494 {
7495         struct sctp_association *asoc;
7496         struct sctp_stream_out *strq;
7497         int goal_mtu, moved_how_much, total_moved = 0, bail = 0;
7498         int locked, giveup;
7499
7500         SCTP_TCB_LOCK_ASSERT(stcb);
7501         asoc = &stcb->asoc;
7502         switch (net->ro._l_addr.sa.sa_family) {
7503 #ifdef INET
7504         case AF_INET:
7505                 goal_mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
7506                 break;
7507 #endif
7508 #ifdef INET6
7509         case AF_INET6:
7510                 goal_mtu = net->mtu - SCTP_MIN_OVERHEAD;
7511                 break;
7512 #endif
7513         default:
7514                 /* TSNH */
7515                 goal_mtu = net->mtu;
7516                 break;
7517         }
7518         /* Need an allowance for the data chunk header too */
7519         goal_mtu -= sizeof(struct sctp_data_chunk);
7520
7521         /* must make even word boundary */
7522         goal_mtu &= 0xfffffffc;
7523         if (asoc->locked_on_sending) {
7524                 /* We are stuck on one stream until the message completes. */
7525                 strq = asoc->locked_on_sending;
7526                 locked = 1;
7527         } else {
7528                 strq = stcb->asoc.ss_functions.sctp_ss_select_stream(stcb, net, asoc);
7529                 locked = 0;
7530         }
7531         while ((goal_mtu > 0) && strq) {
7532                 giveup = 0;
7533                 bail = 0;
7534                 moved_how_much = sctp_move_to_outqueue(stcb, strq, goal_mtu, frag_point, &locked,
7535                     &giveup, eeor_mode, &bail, so_locked);
7536                 if (moved_how_much)
7537                         stcb->asoc.ss_functions.sctp_ss_scheduled(stcb, net, asoc, strq, moved_how_much);
7538
7539                 if (locked) {
7540                         asoc->locked_on_sending = strq;
7541                         if ((moved_how_much == 0) || (giveup) || bail)
7542                                 /* no more to move for now */
7543                                 break;
7544                 } else {
7545                         asoc->locked_on_sending = NULL;
7546                         if ((giveup) || bail) {
7547                                 break;
7548                         }
7549                         strq = stcb->asoc.ss_functions.sctp_ss_select_stream(stcb, net, asoc);
7550                         if (strq == NULL) {
7551                                 break;
7552                         }
7553                 }
7554                 total_moved += moved_how_much;
7555                 goal_mtu -= (moved_how_much + sizeof(struct sctp_data_chunk));
7556                 goal_mtu &= 0xfffffffc;
7557         }
7558         if (bail)
7559                 *quit_now = 1;
7560
7561         stcb->asoc.ss_functions.sctp_ss_packet_done(stcb, net, asoc);
7562
7563         if (total_moved == 0) {
7564                 if ((stcb->asoc.sctp_cmt_on_off == 0) &&
7565                     (net == stcb->asoc.primary_destination)) {
7566                         /* ran dry for primary network net */
7567                         SCTP_STAT_INCR(sctps_primary_randry);
7568                 } else if (stcb->asoc.sctp_cmt_on_off > 0) {
7569                         /* ran dry with CMT on */
7570                         SCTP_STAT_INCR(sctps_cmt_randry);
7571                 }
7572         }
7573 }
7574
7575 void
7576 sctp_fix_ecn_echo(struct sctp_association *asoc)
7577 {
7578         struct sctp_tmit_chunk *chk;
7579
7580         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
7581                 if (chk->rec.chunk_id.id == SCTP_ECN_ECHO) {
7582                         chk->sent = SCTP_DATAGRAM_UNSENT;
7583                 }
7584         }
7585 }
7586
7587 void
7588 sctp_move_chunks_from_net(struct sctp_tcb *stcb, struct sctp_nets *net)
7589 {
7590         struct sctp_association *asoc;
7591         struct sctp_tmit_chunk *chk;
7592         struct sctp_stream_queue_pending *sp;
7593         unsigned int i;
7594
7595         if (net == NULL) {
7596                 return;
7597         }
7598         asoc = &stcb->asoc;
7599         for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
7600                 TAILQ_FOREACH(sp, &stcb->asoc.strmout[i].outqueue, next) {
7601                         if (sp->net == net) {
7602                                 sctp_free_remote_addr(sp->net);
7603                                 sp->net = NULL;
7604                         }
7605                 }
7606         }
7607         TAILQ_FOREACH(chk, &asoc->send_queue, sctp_next) {
7608                 if (chk->whoTo == net) {
7609                         sctp_free_remote_addr(chk->whoTo);
7610                         chk->whoTo = NULL;
7611                 }
7612         }
7613 }
7614
7615 int
7616 sctp_med_chunk_output(struct sctp_inpcb *inp,
7617     struct sctp_tcb *stcb,
7618     struct sctp_association *asoc,
7619     int *num_out,
7620     int *reason_code,
7621     int control_only, int from_where,
7622     struct timeval *now, int *now_filled, int frag_point, int so_locked
7623 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
7624     SCTP_UNUSED
7625 #endif
7626 )
7627 {
7628         /**
7629          * Ok this is the generic chunk service queue. we must do the
7630          * following: - Service the stream queue that is next, moving any
7631          * message (note I must get a complete message i.e. FIRST/MIDDLE and
7632          * LAST to the out queue in one pass) and assigning TSN's - Check to
7633          * see if the cwnd/rwnd allows any output, if so we go ahead and
7634          * fomulate and send the low level chunks. Making sure to combine
7635          * any control in the control chunk queue also.
7636          */
7637         struct sctp_nets *net, *start_at, *sack_goes_to = NULL, *old_start_at = NULL;
7638         struct mbuf *outchain, *endoutchain;
7639         struct sctp_tmit_chunk *chk, *nchk;
7640
7641         /* temp arrays for unlinking */
7642         struct sctp_tmit_chunk *data_list[SCTP_MAX_DATA_BUNDLING];
7643         int no_fragmentflg, error;
7644         unsigned int max_rwnd_per_dest, max_send_per_dest;
7645         int one_chunk, hbflag, skip_data_for_this_net;
7646         int asconf, cookie, no_out_cnt;
7647         int bundle_at, ctl_cnt, no_data_chunks, eeor_mode;
7648         unsigned int mtu, r_mtu, omtu, mx_mtu, to_out;
7649         int tsns_sent = 0;
7650         uint32_t auth_offset = 0;
7651         struct sctp_auth_chunk *auth = NULL;
7652         uint16_t auth_keyid;
7653         int override_ok = 1;
7654         int skip_fill_up = 0;
7655         int data_auth_reqd = 0;
7656
7657         /*
7658          * JRS 5/14/07 - Add flag for whether a heartbeat is sent to the
7659          * destination.
7660          */
7661         int quit_now = 0;
7662
7663         *num_out = 0;
7664         auth_keyid = stcb->asoc.authinfo.active_keyid;
7665
7666         if ((asoc->state & SCTP_STATE_SHUTDOWN_PENDING) ||
7667             (asoc->state & SCTP_STATE_SHUTDOWN_RECEIVED) ||
7668             (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_EXPLICIT_EOR))) {
7669                 eeor_mode = 1;
7670         } else {
7671                 eeor_mode = 0;
7672         }
7673         ctl_cnt = no_out_cnt = asconf = cookie = 0;
7674         /*
7675          * First lets prime the pump. For each destination, if there is room
7676          * in the flight size, attempt to pull an MTU's worth out of the
7677          * stream queues into the general send_queue
7678          */
7679 #ifdef SCTP_AUDITING_ENABLED
7680         sctp_audit_log(0xC2, 2);
7681 #endif
7682         SCTP_TCB_LOCK_ASSERT(stcb);
7683         hbflag = 0;
7684         if ((control_only) || (asoc->stream_reset_outstanding))
7685                 no_data_chunks = 1;
7686         else
7687                 no_data_chunks = 0;
7688
7689         /* Nothing to possible to send? */
7690         if ((TAILQ_EMPTY(&asoc->control_send_queue) ||
7691             (asoc->ctrl_queue_cnt == stcb->asoc.ecn_echo_cnt_onq)) &&
7692             TAILQ_EMPTY(&asoc->asconf_send_queue) &&
7693             TAILQ_EMPTY(&asoc->send_queue) &&
7694             stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc)) {
7695 nothing_to_send:
7696                 *reason_code = 9;
7697                 return (0);
7698         }
7699         if (asoc->peers_rwnd == 0) {
7700                 /* No room in peers rwnd */
7701                 *reason_code = 1;
7702                 if (asoc->total_flight > 0) {
7703                         /* we are allowed one chunk in flight */
7704                         no_data_chunks = 1;
7705                 }
7706         }
7707         if (stcb->asoc.ecn_echo_cnt_onq) {
7708                 /* Record where a sack goes, if any */
7709                 if (no_data_chunks &&
7710                     (asoc->ctrl_queue_cnt == stcb->asoc.ecn_echo_cnt_onq)) {
7711                         /* Nothing but ECNe to send - we don't do that */
7712                         goto nothing_to_send;
7713                 }
7714                 TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
7715                         if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
7716                             (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK)) {
7717                                 sack_goes_to = chk->whoTo;
7718                                 break;
7719                         }
7720                 }
7721         }
7722         max_rwnd_per_dest = ((asoc->peers_rwnd + asoc->total_flight) / asoc->numnets);
7723         if (stcb->sctp_socket)
7724                 max_send_per_dest = SCTP_SB_LIMIT_SND(stcb->sctp_socket) / asoc->numnets;
7725         else
7726                 max_send_per_dest = 0;
7727         if (no_data_chunks == 0) {
7728                 /* How many non-directed chunks are there? */
7729                 TAILQ_FOREACH(chk, &asoc->send_queue, sctp_next) {
7730                         if (chk->whoTo == NULL) {
7731                                 /*
7732                                  * We already have non-directed chunks on
7733                                  * the queue, no need to do a fill-up.
7734                                  */
7735                                 skip_fill_up = 1;
7736                                 break;
7737                         }
7738                 }
7739
7740         }
7741         if ((no_data_chunks == 0) &&
7742             (skip_fill_up == 0) &&
7743             (!stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc))) {
7744                 TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
7745                         /*
7746                          * This for loop we are in takes in each net, if
7747                          * its's got space in cwnd and has data sent to it
7748                          * (when CMT is off) then it calls
7749                          * sctp_fill_outqueue for the net. This gets data on
7750                          * the send queue for that network.
7751                          *
7752                          * In sctp_fill_outqueue TSN's are assigned and data is
7753                          * copied out of the stream buffers. Note mostly
7754                          * copy by reference (we hope).
7755                          */
7756                         net->window_probe = 0;
7757                         if ((net != stcb->asoc.alternate) &&
7758                             ((net->dest_state & SCTP_ADDR_PF) ||
7759                             (!(net->dest_state & SCTP_ADDR_REACHABLE)) ||
7760                             (net->dest_state & SCTP_ADDR_UNCONFIRMED))) {
7761                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
7762                                         sctp_log_cwnd(stcb, net, 1,
7763                                             SCTP_CWND_LOG_FILL_OUTQ_CALLED);
7764                                 }
7765                                 continue;
7766                         }
7767                         if ((stcb->asoc.cc_functions.sctp_cwnd_new_transmission_begins) &&
7768                             (net->flight_size == 0)) {
7769                                 (*stcb->asoc.cc_functions.sctp_cwnd_new_transmission_begins) (stcb, net);
7770                         }
7771                         if (net->flight_size >= net->cwnd) {
7772                                 /* skip this network, no room - can't fill */
7773                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
7774                                         sctp_log_cwnd(stcb, net, 3,
7775                                             SCTP_CWND_LOG_FILL_OUTQ_CALLED);
7776                                 }
7777                                 continue;
7778                         }
7779                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
7780                                 sctp_log_cwnd(stcb, net, 4, SCTP_CWND_LOG_FILL_OUTQ_CALLED);
7781                         }
7782                         sctp_fill_outqueue(stcb, net, frag_point, eeor_mode, &quit_now, so_locked);
7783                         if (quit_now) {
7784                                 /* memory alloc failure */
7785                                 no_data_chunks = 1;
7786                                 break;
7787                         }
7788                 }
7789         }
7790         /* now service each destination and send out what we can for it */
7791         /* Nothing to send? */
7792         if (TAILQ_EMPTY(&asoc->control_send_queue) &&
7793             TAILQ_EMPTY(&asoc->asconf_send_queue) &&
7794             TAILQ_EMPTY(&asoc->send_queue)) {
7795                 *reason_code = 8;
7796                 return (0);
7797         }
7798         if (asoc->sctp_cmt_on_off > 0) {
7799                 /* get the last start point */
7800                 start_at = asoc->last_net_cmt_send_started;
7801                 if (start_at == NULL) {
7802                         /* null so to beginning */
7803                         start_at = TAILQ_FIRST(&asoc->nets);
7804                 } else {
7805                         start_at = TAILQ_NEXT(asoc->last_net_cmt_send_started, sctp_next);
7806                         if (start_at == NULL) {
7807                                 start_at = TAILQ_FIRST(&asoc->nets);
7808                         }
7809                 }
7810                 asoc->last_net_cmt_send_started = start_at;
7811         } else {
7812                 start_at = TAILQ_FIRST(&asoc->nets);
7813         }
7814         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
7815                 if (chk->whoTo == NULL) {
7816                         if (asoc->alternate) {
7817                                 chk->whoTo = asoc->alternate;
7818                         } else {
7819                                 chk->whoTo = asoc->primary_destination;
7820                         }
7821                         atomic_add_int(&chk->whoTo->ref_count, 1);
7822                 }
7823         }
7824         old_start_at = NULL;
7825 again_one_more_time:
7826         for (net = start_at; net != NULL; net = TAILQ_NEXT(net, sctp_next)) {
7827                 /* how much can we send? */
7828                 /* SCTPDBG("Examine for sending net:%x\n", (uint32_t)net); */
7829                 if (old_start_at && (old_start_at == net)) {
7830                         /* through list ocmpletely. */
7831                         break;
7832                 }
7833                 tsns_sent = 0xa;
7834                 if (TAILQ_EMPTY(&asoc->control_send_queue) &&
7835                     TAILQ_EMPTY(&asoc->asconf_send_queue) &&
7836                     (net->flight_size >= net->cwnd)) {
7837                         /*
7838                          * Nothing on control or asconf and flight is full,
7839                          * we can skip even in the CMT case.
7840                          */
7841                         continue;
7842                 }
7843                 bundle_at = 0;
7844                 endoutchain = outchain = NULL;
7845                 no_fragmentflg = 1;
7846                 one_chunk = 0;
7847                 if (net->dest_state & SCTP_ADDR_UNCONFIRMED) {
7848                         skip_data_for_this_net = 1;
7849                 } else {
7850                         skip_data_for_this_net = 0;
7851                 }
7852                 if ((net->ro.ro_rt) && (net->ro.ro_rt->rt_ifp)) {
7853                         /*
7854                          * if we have a route and an ifp check to see if we
7855                          * have room to send to this guy
7856                          */
7857                         struct ifnet *ifp;
7858
7859                         ifp = net->ro.ro_rt->rt_ifp;
7860                         if ((ifp->if_snd.ifq_len + 2) >= ifp->if_snd.ifq_maxlen) {
7861                                 SCTP_STAT_INCR(sctps_ifnomemqueued);
7862                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_MAXBURST_ENABLE) {
7863                                         sctp_log_maxburst(stcb, net, ifp->if_snd.ifq_len, ifp->if_snd.ifq_maxlen, SCTP_MAX_IFP_APPLIED);
7864                                 }
7865                                 continue;
7866                         }
7867                 }
7868                 switch (((struct sockaddr *)&net->ro._l_addr)->sa_family) {
7869 #ifdef INET
7870                 case AF_INET:
7871                         mtu = net->mtu - (sizeof(struct ip) + sizeof(struct sctphdr));
7872                         break;
7873 #endif
7874 #ifdef INET6
7875                 case AF_INET6:
7876                         mtu = net->mtu - (sizeof(struct ip6_hdr) + sizeof(struct sctphdr));
7877                         break;
7878 #endif
7879                 default:
7880                         /* TSNH */
7881                         mtu = net->mtu;
7882                         break;
7883                 }
7884                 mx_mtu = mtu;
7885                 to_out = 0;
7886                 if (mtu > asoc->peers_rwnd) {
7887                         if (asoc->total_flight > 0) {
7888                                 /* We have a packet in flight somewhere */
7889                                 r_mtu = asoc->peers_rwnd;
7890                         } else {
7891                                 /* We are always allowed to send one MTU out */
7892                                 one_chunk = 1;
7893                                 r_mtu = mtu;
7894                         }
7895                 } else {
7896                         r_mtu = mtu;
7897                 }
7898                 /************************/
7899                 /* ASCONF transmission */
7900                 /************************/
7901                 /* Now first lets go through the asconf queue */
7902                 TAILQ_FOREACH_SAFE(chk, &asoc->asconf_send_queue, sctp_next, nchk) {
7903                         if (chk->rec.chunk_id.id != SCTP_ASCONF) {
7904                                 continue;
7905                         }
7906                         if (chk->whoTo == NULL) {
7907                                 if (asoc->alternate == NULL) {
7908                                         if (asoc->primary_destination != net) {
7909                                                 break;
7910                                         }
7911                                 } else {
7912                                         if (asoc->alternate != net) {
7913                                                 break;
7914                                         }
7915                                 }
7916                         } else {
7917                                 if (chk->whoTo != net) {
7918                                         break;
7919                                 }
7920                         }
7921                         if (chk->data == NULL) {
7922                                 break;
7923                         }
7924                         if (chk->sent != SCTP_DATAGRAM_UNSENT &&
7925                             chk->sent != SCTP_DATAGRAM_RESEND) {
7926                                 break;
7927                         }
7928                         /*
7929                          * if no AUTH is yet included and this chunk
7930                          * requires it, make sure to account for it.  We
7931                          * don't apply the size until the AUTH chunk is
7932                          * actually added below in case there is no room for
7933                          * this chunk. NOTE: we overload the use of "omtu"
7934                          * here
7935                          */
7936                         if ((auth == NULL) &&
7937                             sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
7938                             stcb->asoc.peer_auth_chunks)) {
7939                                 omtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
7940                         } else
7941                                 omtu = 0;
7942                         /* Here we do NOT factor the r_mtu */
7943                         if ((chk->send_size < (int)(mtu - omtu)) ||
7944                             (chk->flags & CHUNK_FLAGS_FRAGMENT_OK)) {
7945                                 /*
7946                                  * We probably should glom the mbuf chain
7947                                  * from the chk->data for control but the
7948                                  * problem is it becomes yet one more level
7949                                  * of tracking to do if for some reason
7950                                  * output fails. Then I have got to
7951                                  * reconstruct the merged control chain.. el
7952                                  * yucko.. for now we take the easy way and
7953                                  * do the copy
7954                                  */
7955                                 /*
7956                                  * Add an AUTH chunk, if chunk requires it
7957                                  * save the offset into the chain for AUTH
7958                                  */
7959                                 if ((auth == NULL) &&
7960                                     (sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
7961                                     stcb->asoc.peer_auth_chunks))) {
7962                                         outchain = sctp_add_auth_chunk(outchain,
7963                                             &endoutchain,
7964                                             &auth,
7965                                             &auth_offset,
7966                                             stcb,
7967                                             chk->rec.chunk_id.id);
7968                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
7969                                 }
7970                                 outchain = sctp_copy_mbufchain(chk->data, outchain, &endoutchain,
7971                                     (int)chk->rec.chunk_id.can_take_data,
7972                                     chk->send_size, chk->copy_by_ref);
7973                                 if (outchain == NULL) {
7974                                         *reason_code = 8;
7975                                         SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
7976                                         return (ENOMEM);
7977                                 }
7978                                 SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
7979                                 /* update our MTU size */
7980                                 if (mtu > (chk->send_size + omtu))
7981                                         mtu -= (chk->send_size + omtu);
7982                                 else
7983                                         mtu = 0;
7984                                 to_out += (chk->send_size + omtu);
7985                                 /* Do clear IP_DF ? */
7986                                 if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
7987                                         no_fragmentflg = 0;
7988                                 }
7989                                 if (chk->rec.chunk_id.can_take_data)
7990                                         chk->data = NULL;
7991                                 /*
7992                                  * set hb flag since we can use these for
7993                                  * RTO
7994                                  */
7995                                 hbflag = 1;
7996                                 asconf = 1;
7997                                 /*
7998                                  * should sysctl this: don't bundle data
7999                                  * with ASCONF since it requires AUTH
8000                                  */
8001                                 no_data_chunks = 1;
8002                                 chk->sent = SCTP_DATAGRAM_SENT;
8003                                 if (chk->whoTo == NULL) {
8004                                         chk->whoTo = net;
8005                                         atomic_add_int(&net->ref_count, 1);
8006                                 }
8007                                 chk->snd_count++;
8008                                 if (mtu == 0) {
8009                                         /*
8010                                          * Ok we are out of room but we can
8011                                          * output without effecting the
8012                                          * flight size since this little guy
8013                                          * is a control only packet.
8014                                          */
8015                                         sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp, stcb, net);
8016                                         /*
8017                                          * do NOT clear the asconf flag as
8018                                          * it is used to do appropriate
8019                                          * source address selection.
8020                                          */
8021                                         if ((error = sctp_lowlevel_chunk_output(inp, stcb, net,
8022                                             (struct sockaddr *)&net->ro._l_addr,
8023                                             outchain, auth_offset, auth,
8024                                             stcb->asoc.authinfo.active_keyid,
8025                                             no_fragmentflg, 0, asconf,
8026                                             inp->sctp_lport, stcb->rport,
8027                                             htonl(stcb->asoc.peer_vtag),
8028                                             net->port, NULL,
8029                                             0, 0,
8030                                             so_locked))) {
8031                                                 if (error == ENOBUFS) {
8032                                                         asoc->ifp_had_enobuf = 1;
8033                                                         SCTP_STAT_INCR(sctps_lowlevelerr);
8034                                                 }
8035                                                 if (from_where == 0) {
8036                                                         SCTP_STAT_INCR(sctps_lowlevelerrusr);
8037                                                 }
8038                                                 if (*now_filled == 0) {
8039                                                         (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
8040                                                         *now_filled = 1;
8041                                                         *now = net->last_sent_time;
8042                                                 } else {
8043                                                         net->last_sent_time = *now;
8044                                                 }
8045                                                 hbflag = 0;
8046                                                 /* error, could not output */
8047                                                 if (error == EHOSTUNREACH) {
8048                                                         /*
8049                                                          * Destination went
8050                                                          * unreachable
8051                                                          * during this send
8052                                                          */
8053                                                         sctp_move_chunks_from_net(stcb, net);
8054                                                 }
8055                                                 *reason_code = 7;
8056                                                 continue;
8057                                         } else
8058                                                 asoc->ifp_had_enobuf = 0;
8059                                         if (*now_filled == 0) {
8060                                                 (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
8061                                                 *now_filled = 1;
8062                                                 *now = net->last_sent_time;
8063                                         } else {
8064                                                 net->last_sent_time = *now;
8065                                         }
8066                                         hbflag = 0;
8067                                         /*
8068                                          * increase the number we sent, if a
8069                                          * cookie is sent we don't tell them
8070                                          * any was sent out.
8071                                          */
8072                                         outchain = endoutchain = NULL;
8073                                         auth = NULL;
8074                                         auth_offset = 0;
8075                                         if (!no_out_cnt)
8076                                                 *num_out += ctl_cnt;
8077                                         /* recalc a clean slate and setup */
8078                                         switch (net->ro._l_addr.sa.sa_family) {
8079 #ifdef INET
8080                                         case AF_INET:
8081                                                 mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
8082                                                 break;
8083 #endif
8084 #ifdef INET6
8085                                         case AF_INET6:
8086                                                 mtu = net->mtu - SCTP_MIN_OVERHEAD;
8087                                                 break;
8088 #endif
8089                                         default:
8090                                                 /* TSNH */
8091                                                 mtu = net->mtu;
8092                                                 break;
8093                                         }
8094                                         to_out = 0;
8095                                         no_fragmentflg = 1;
8096                                 }
8097                         }
8098                 }
8099                 /************************/
8100                 /* Control transmission */
8101                 /************************/
8102                 /* Now first lets go through the control queue */
8103                 TAILQ_FOREACH_SAFE(chk, &asoc->control_send_queue, sctp_next, nchk) {
8104                         if ((sack_goes_to) &&
8105                             (chk->rec.chunk_id.id == SCTP_ECN_ECHO) &&
8106                             (chk->whoTo != sack_goes_to)) {
8107                                 /*
8108                                  * if we have a sack in queue, and we are
8109                                  * looking at an ecn echo that is NOT queued
8110                                  * to where the sack is going..
8111                                  */
8112                                 if (chk->whoTo == net) {
8113                                         /*
8114                                          * Don't transmit it to where its
8115                                          * going (current net)
8116                                          */
8117                                         continue;
8118                                 } else if (sack_goes_to == net) {
8119                                         /*
8120                                          * But do transmit it to this
8121                                          * address
8122                                          */
8123                                         goto skip_net_check;
8124                                 }
8125                         }
8126                         if (chk->whoTo == NULL) {
8127                                 if (asoc->alternate == NULL) {
8128                                         if (asoc->primary_destination != net) {
8129                                                 continue;
8130                                         }
8131                                 } else {
8132                                         if (asoc->alternate != net) {
8133                                                 continue;
8134                                         }
8135                                 }
8136                         } else {
8137                                 if (chk->whoTo != net) {
8138                                         continue;
8139                                 }
8140                         }
8141         skip_net_check:
8142                         if (chk->data == NULL) {
8143                                 continue;
8144                         }
8145                         if (chk->sent != SCTP_DATAGRAM_UNSENT) {
8146                                 /*
8147                                  * It must be unsent. Cookies and ASCONF's
8148                                  * hang around but there timers will force
8149                                  * when marked for resend.
8150                                  */
8151                                 continue;
8152                         }
8153                         /*
8154                          * if no AUTH is yet included and this chunk
8155                          * requires it, make sure to account for it.  We
8156                          * don't apply the size until the AUTH chunk is
8157                          * actually added below in case there is no room for
8158                          * this chunk. NOTE: we overload the use of "omtu"
8159                          * here
8160                          */
8161                         if ((auth == NULL) &&
8162                             sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
8163                             stcb->asoc.peer_auth_chunks)) {
8164                                 omtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
8165                         } else
8166                                 omtu = 0;
8167                         /* Here we do NOT factor the r_mtu */
8168                         if ((chk->send_size <= (int)(mtu - omtu)) ||
8169                             (chk->flags & CHUNK_FLAGS_FRAGMENT_OK)) {
8170                                 /*
8171                                  * We probably should glom the mbuf chain
8172                                  * from the chk->data for control but the
8173                                  * problem is it becomes yet one more level
8174                                  * of tracking to do if for some reason
8175                                  * output fails. Then I have got to
8176                                  * reconstruct the merged control chain.. el
8177                                  * yucko.. for now we take the easy way and
8178                                  * do the copy
8179                                  */
8180                                 /*
8181                                  * Add an AUTH chunk, if chunk requires it
8182                                  * save the offset into the chain for AUTH
8183                                  */
8184                                 if ((auth == NULL) &&
8185                                     (sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
8186                                     stcb->asoc.peer_auth_chunks))) {
8187                                         outchain = sctp_add_auth_chunk(outchain,
8188                                             &endoutchain,
8189                                             &auth,
8190                                             &auth_offset,
8191                                             stcb,
8192                                             chk->rec.chunk_id.id);
8193                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8194                                 }
8195                                 outchain = sctp_copy_mbufchain(chk->data, outchain, &endoutchain,
8196                                     (int)chk->rec.chunk_id.can_take_data,
8197                                     chk->send_size, chk->copy_by_ref);
8198                                 if (outchain == NULL) {
8199                                         *reason_code = 8;
8200                                         SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
8201                                         return (ENOMEM);
8202                                 }
8203                                 SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8204                                 /* update our MTU size */
8205                                 if (mtu > (chk->send_size + omtu))
8206                                         mtu -= (chk->send_size + omtu);
8207                                 else
8208                                         mtu = 0;
8209                                 to_out += (chk->send_size + omtu);
8210                                 /* Do clear IP_DF ? */
8211                                 if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
8212                                         no_fragmentflg = 0;
8213                                 }
8214                                 if (chk->rec.chunk_id.can_take_data)
8215                                         chk->data = NULL;
8216                                 /* Mark things to be removed, if needed */
8217                                 if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
8218                                     (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK) ||  /* EY */
8219                                     (chk->rec.chunk_id.id == SCTP_HEARTBEAT_REQUEST) ||
8220                                     (chk->rec.chunk_id.id == SCTP_HEARTBEAT_ACK) ||
8221                                     (chk->rec.chunk_id.id == SCTP_SHUTDOWN) ||
8222                                     (chk->rec.chunk_id.id == SCTP_SHUTDOWN_ACK) ||
8223                                     (chk->rec.chunk_id.id == SCTP_OPERATION_ERROR) ||
8224                                     (chk->rec.chunk_id.id == SCTP_COOKIE_ACK) ||
8225                                     (chk->rec.chunk_id.id == SCTP_ECN_CWR) ||
8226                                     (chk->rec.chunk_id.id == SCTP_PACKET_DROPPED) ||
8227                                     (chk->rec.chunk_id.id == SCTP_ASCONF_ACK)) {
8228                                         if (chk->rec.chunk_id.id == SCTP_HEARTBEAT_REQUEST) {
8229                                                 hbflag = 1;
8230                                         }
8231                                         /* remove these chunks at the end */
8232                                         if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
8233                                             (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK)) {
8234                                                 /* turn off the timer */
8235                                                 if (SCTP_OS_TIMER_PENDING(&stcb->asoc.dack_timer.timer)) {
8236                                                         sctp_timer_stop(SCTP_TIMER_TYPE_RECV,
8237                                                             inp, stcb, net, SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_1);
8238                                                 }
8239                                         }
8240                                         ctl_cnt++;
8241                                 } else {
8242                                         /*
8243                                          * Other chunks, since they have
8244                                          * timers running (i.e. COOKIE) we
8245                                          * just "trust" that it gets sent or
8246                                          * retransmitted.
8247                                          */
8248                                         ctl_cnt++;
8249                                         if (chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
8250                                                 cookie = 1;
8251                                                 no_out_cnt = 1;
8252                                         } else if (chk->rec.chunk_id.id == SCTP_ECN_ECHO) {
8253                                                 /*
8254                                                  * Increment ecne send count
8255                                                  * here this means we may be
8256                                                  * over-zealous in our
8257                                                  * counting if the send
8258                                                  * fails, but its the best
8259                                                  * place to do it (we used
8260                                                  * to do it in the queue of
8261                                                  * the chunk, but that did
8262                                                  * not tell how many times
8263                                                  * it was sent.
8264                                                  */
8265                                                 SCTP_STAT_INCR(sctps_sendecne);
8266                                         }
8267                                         chk->sent = SCTP_DATAGRAM_SENT;
8268                                         if (chk->whoTo == NULL) {
8269                                                 chk->whoTo = net;
8270                                                 atomic_add_int(&net->ref_count, 1);
8271                                         }
8272                                         chk->snd_count++;
8273                                 }
8274                                 if (mtu == 0) {
8275                                         /*
8276                                          * Ok we are out of room but we can
8277                                          * output without effecting the
8278                                          * flight size since this little guy
8279                                          * is a control only packet.
8280                                          */
8281                                         if (asconf) {
8282                                                 sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp, stcb, net);
8283                                                 /*
8284                                                  * do NOT clear the asconf
8285                                                  * flag as it is used to do
8286                                                  * appropriate source
8287                                                  * address selection.
8288                                                  */
8289                                         }
8290                                         if (cookie) {
8291                                                 sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, inp, stcb, net);
8292                                                 cookie = 0;
8293                                         }
8294                                         if ((error = sctp_lowlevel_chunk_output(inp, stcb, net,
8295                                             (struct sockaddr *)&net->ro._l_addr,
8296                                             outchain,
8297                                             auth_offset, auth,
8298                                             stcb->asoc.authinfo.active_keyid,
8299                                             no_fragmentflg, 0, asconf,
8300                                             inp->sctp_lport, stcb->rport,
8301                                             htonl(stcb->asoc.peer_vtag),
8302                                             net->port, NULL,
8303                                             0, 0,
8304                                             so_locked))) {
8305                                                 if (error == ENOBUFS) {
8306                                                         asoc->ifp_had_enobuf = 1;
8307                                                         SCTP_STAT_INCR(sctps_lowlevelerr);
8308                                                 }
8309                                                 if (from_where == 0) {
8310                                                         SCTP_STAT_INCR(sctps_lowlevelerrusr);
8311                                                 }
8312                                                 /* error, could not output */
8313                                                 if (hbflag) {
8314                                                         if (*now_filled == 0) {
8315                                                                 (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
8316                                                                 *now_filled = 1;
8317                                                                 *now = net->last_sent_time;
8318                                                         } else {
8319                                                                 net->last_sent_time = *now;
8320                                                         }
8321                                                         hbflag = 0;
8322                                                 }
8323                                                 if (error == EHOSTUNREACH) {
8324                                                         /*
8325                                                          * Destination went
8326                                                          * unreachable
8327                                                          * during this send
8328                                                          */
8329                                                         sctp_move_chunks_from_net(stcb, net);
8330                                                 }
8331                                                 *reason_code = 7;
8332                                                 continue;
8333                                         } else
8334                                                 asoc->ifp_had_enobuf = 0;
8335                                         /* Only HB or ASCONF advances time */
8336                                         if (hbflag) {
8337                                                 if (*now_filled == 0) {
8338                                                         (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
8339                                                         *now_filled = 1;
8340                                                         *now = net->last_sent_time;
8341                                                 } else {
8342                                                         net->last_sent_time = *now;
8343                                                 }
8344                                                 hbflag = 0;
8345                                         }
8346                                         /*
8347                                          * increase the number we sent, if a
8348                                          * cookie is sent we don't tell them
8349                                          * any was sent out.
8350                                          */
8351                                         outchain = endoutchain = NULL;
8352                                         auth = NULL;
8353                                         auth_offset = 0;
8354                                         if (!no_out_cnt)
8355                                                 *num_out += ctl_cnt;
8356                                         /* recalc a clean slate and setup */
8357                                         switch (net->ro._l_addr.sa.sa_family) {
8358 #ifdef INET
8359                                         case AF_INET:
8360                                                 mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
8361                                                 break;
8362 #endif
8363 #ifdef INET6
8364                                         case AF_INET6:
8365                                                 mtu = net->mtu - SCTP_MIN_OVERHEAD;
8366                                                 break;
8367 #endif
8368                                         default:
8369                                                 /* TSNH */
8370                                                 mtu = net->mtu;
8371                                                 break;
8372                                         }
8373                                         to_out = 0;
8374                                         no_fragmentflg = 1;
8375                                 }
8376                         }
8377                 }
8378                 /* JRI: if dest is in PF state, do not send data to it */
8379                 if ((asoc->sctp_cmt_on_off > 0) &&
8380                     (net != stcb->asoc.alternate) &&
8381                     (net->dest_state & SCTP_ADDR_PF)) {
8382                         goto no_data_fill;
8383                 }
8384                 if (net->flight_size >= net->cwnd) {
8385                         goto no_data_fill;
8386                 }
8387                 if ((asoc->sctp_cmt_on_off > 0) &&
8388                     (SCTP_BASE_SYSCTL(sctp_buffer_splitting) & SCTP_RECV_BUFFER_SPLITTING) &&
8389                     (net->flight_size > max_rwnd_per_dest)) {
8390                         goto no_data_fill;
8391                 }
8392                 /*
8393                  * We need a specific accounting for the usage of the send
8394                  * buffer. We also need to check the number of messages per
8395                  * net. For now, this is better than nothing and it disabled
8396                  * by default...
8397                  */
8398                 if ((asoc->sctp_cmt_on_off > 0) &&
8399                     (SCTP_BASE_SYSCTL(sctp_buffer_splitting) & SCTP_SEND_BUFFER_SPLITTING) &&
8400                     (max_send_per_dest > 0) &&
8401                     (net->flight_size > max_send_per_dest)) {
8402                         goto no_data_fill;
8403                 }
8404                 /*********************/
8405                 /* Data transmission */
8406                 /*********************/
8407                 /*
8408                  * if AUTH for DATA is required and no AUTH has been added
8409                  * yet, account for this in the mtu now... if no data can be
8410                  * bundled, this adjustment won't matter anyways since the
8411                  * packet will be going out...
8412                  */
8413                 data_auth_reqd = sctp_auth_is_required_chunk(SCTP_DATA,
8414                     stcb->asoc.peer_auth_chunks);
8415                 if (data_auth_reqd && (auth == NULL)) {
8416                         mtu -= sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
8417                 }
8418                 /* now lets add any data within the MTU constraints */
8419                 switch (((struct sockaddr *)&net->ro._l_addr)->sa_family) {
8420 #ifdef INET
8421                 case AF_INET:
8422                         if (net->mtu > (sizeof(struct ip) + sizeof(struct sctphdr)))
8423                                 omtu = net->mtu - (sizeof(struct ip) + sizeof(struct sctphdr));
8424                         else
8425                                 omtu = 0;
8426                         break;
8427 #endif
8428 #ifdef INET6
8429                 case AF_INET6:
8430                         if (net->mtu > (sizeof(struct ip6_hdr) + sizeof(struct sctphdr)))
8431                                 omtu = net->mtu - (sizeof(struct ip6_hdr) + sizeof(struct sctphdr));
8432                         else
8433                                 omtu = 0;
8434                         break;
8435 #endif
8436                 default:
8437                         /* TSNH */
8438                         omtu = 0;
8439                         break;
8440                 }
8441                 if ((((asoc->state & SCTP_STATE_OPEN) == SCTP_STATE_OPEN) &&
8442                     (skip_data_for_this_net == 0)) ||
8443                     (cookie)) {
8444                         TAILQ_FOREACH_SAFE(chk, &asoc->send_queue, sctp_next, nchk) {
8445                                 if (no_data_chunks) {
8446                                         /* let only control go out */
8447                                         *reason_code = 1;
8448                                         break;
8449                                 }
8450                                 if (net->flight_size >= net->cwnd) {
8451                                         /* skip this net, no room for data */
8452                                         *reason_code = 2;
8453                                         break;
8454                                 }
8455                                 if ((chk->whoTo != NULL) &&
8456                                     (chk->whoTo != net)) {
8457                                         /* Don't send the chunk on this net */
8458                                         continue;
8459                                 }
8460                                 if (asoc->sctp_cmt_on_off == 0) {
8461                                         if ((asoc->alternate) &&
8462                                             (asoc->alternate != net) &&
8463                                             (chk->whoTo == NULL)) {
8464                                                 continue;
8465                                         } else if ((net != asoc->primary_destination) &&
8466                                                     (asoc->alternate == NULL) &&
8467                                             (chk->whoTo == NULL)) {
8468                                                 continue;
8469                                         }
8470                                 }
8471                                 if ((chk->send_size > omtu) && ((chk->flags & CHUNK_FLAGS_FRAGMENT_OK) == 0)) {
8472                                         /*-
8473                                          * strange, we have a chunk that is
8474                                          * to big for its destination and
8475                                          * yet no fragment ok flag.
8476                                          * Something went wrong when the
8477                                          * PMTU changed...we did not mark
8478                                          * this chunk for some reason?? I
8479                                          * will fix it here by letting IP
8480                                          * fragment it for now and printing
8481                                          * a warning. This really should not
8482                                          * happen ...
8483                                          */
8484                                         SCTP_PRINTF("Warning chunk of %d bytes > mtu:%d and yet PMTU disc missed\n",
8485                                             chk->send_size, mtu);
8486                                         chk->flags |= CHUNK_FLAGS_FRAGMENT_OK;
8487                                 }
8488                                 if (SCTP_BASE_SYSCTL(sctp_enable_sack_immediately) &&
8489                                     ((asoc->state & SCTP_STATE_SHUTDOWN_PENDING) == SCTP_STATE_SHUTDOWN_PENDING)) {
8490                                         struct sctp_data_chunk *dchkh;
8491
8492                                         dchkh = mtod(chk->data, struct sctp_data_chunk *);
8493                                         dchkh->ch.chunk_flags |= SCTP_DATA_SACK_IMMEDIATELY;
8494                                 }
8495                                 if (((chk->send_size <= mtu) && (chk->send_size <= r_mtu)) ||
8496                                     ((chk->flags & CHUNK_FLAGS_FRAGMENT_OK) && (chk->send_size <= asoc->peers_rwnd))) {
8497                                         /* ok we will add this one */
8498
8499                                         /*
8500                                          * Add an AUTH chunk, if chunk
8501                                          * requires it, save the offset into
8502                                          * the chain for AUTH
8503                                          */
8504                                         if (data_auth_reqd) {
8505                                                 if (auth == NULL) {
8506                                                         outchain = sctp_add_auth_chunk(outchain,
8507                                                             &endoutchain,
8508                                                             &auth,
8509                                                             &auth_offset,
8510                                                             stcb,
8511                                                             SCTP_DATA);
8512                                                         auth_keyid = chk->auth_keyid;
8513                                                         override_ok = 0;
8514                                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8515                                                 } else if (override_ok) {
8516                                                         /*
8517                                                          * use this data's
8518                                                          * keyid
8519                                                          */
8520                                                         auth_keyid = chk->auth_keyid;
8521                                                         override_ok = 0;
8522                                                 } else if (auth_keyid != chk->auth_keyid) {
8523                                                         /*
8524                                                          * different keyid,
8525                                                          * so done bundling
8526                                                          */
8527                                                         break;
8528                                                 }
8529                                         }
8530                                         outchain = sctp_copy_mbufchain(chk->data, outchain, &endoutchain, 0,
8531                                             chk->send_size, chk->copy_by_ref);
8532                                         if (outchain == NULL) {
8533                                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "No memory?\n");
8534                                                 if (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
8535                                                         sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
8536                                                 }
8537                                                 *reason_code = 3;
8538                                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
8539                                                 return (ENOMEM);
8540                                         }
8541                                         /* upate our MTU size */
8542                                         /* Do clear IP_DF ? */
8543                                         if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
8544                                                 no_fragmentflg = 0;
8545                                         }
8546                                         /* unsigned subtraction of mtu */
8547                                         if (mtu > chk->send_size)
8548                                                 mtu -= chk->send_size;
8549                                         else
8550                                                 mtu = 0;
8551                                         /* unsigned subtraction of r_mtu */
8552                                         if (r_mtu > chk->send_size)
8553                                                 r_mtu -= chk->send_size;
8554                                         else
8555                                                 r_mtu = 0;
8556
8557                                         to_out += chk->send_size;
8558                                         if ((to_out > mx_mtu) && no_fragmentflg) {
8559 #ifdef INVARIANTS
8560                                                 panic("Exceeding mtu of %d out size is %d", mx_mtu, to_out);
8561 #else
8562                                                 SCTP_PRINTF("Exceeding mtu of %d out size is %d\n",
8563                                                     mx_mtu, to_out);
8564 #endif
8565                                         }
8566                                         chk->window_probe = 0;
8567                                         data_list[bundle_at++] = chk;
8568                                         if (bundle_at >= SCTP_MAX_DATA_BUNDLING) {
8569                                                 break;
8570                                         }
8571                                         if (chk->sent == SCTP_DATAGRAM_UNSENT) {
8572                                                 if ((chk->rec.data.rcv_flags & SCTP_DATA_UNORDERED) == 0) {
8573                                                         SCTP_STAT_INCR_COUNTER64(sctps_outorderchunks);
8574                                                 } else {
8575                                                         SCTP_STAT_INCR_COUNTER64(sctps_outunorderchunks);
8576                                                 }
8577                                                 if (((chk->rec.data.rcv_flags & SCTP_DATA_LAST_FRAG) == SCTP_DATA_LAST_FRAG) &&
8578                                                     ((chk->rec.data.rcv_flags & SCTP_DATA_FIRST_FRAG) == 0))
8579                                                         /*
8580                                                          * Count number of
8581                                                          * user msg's that
8582                                                          * were fragmented
8583                                                          * we do this by
8584                                                          * counting when we
8585                                                          * see a LAST
8586                                                          * fragment only.
8587                                                          */
8588                                                         SCTP_STAT_INCR_COUNTER64(sctps_fragusrmsgs);
8589                                         }
8590                                         if ((mtu == 0) || (r_mtu == 0) || (one_chunk)) {
8591                                                 if ((one_chunk) && (stcb->asoc.total_flight == 0)) {
8592                                                         data_list[0]->window_probe = 1;
8593                                                         net->window_probe = 1;
8594                                                 }
8595                                                 break;
8596                                         }
8597                                 } else {
8598                                         /*
8599                                          * Must be sent in order of the
8600                                          * TSN's (on a network)
8601                                          */
8602                                         break;
8603                                 }
8604                         }       /* for (chunk gather loop for this net) */
8605                 }               /* if asoc.state OPEN */
8606 no_data_fill:
8607                 /* Is there something to send for this destination? */
8608                 if (outchain) {
8609                         /* We may need to start a control timer or two */
8610                         if (asconf) {
8611                                 sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp,
8612                                     stcb, net);
8613                                 /*
8614                                  * do NOT clear the asconf flag as it is
8615                                  * used to do appropriate source address
8616                                  * selection.
8617                                  */
8618                         }
8619                         if (cookie) {
8620                                 sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, inp, stcb, net);
8621                                 cookie = 0;
8622                         }
8623                         /* must start a send timer if data is being sent */
8624                         if (bundle_at && (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer))) {
8625                                 /*
8626                                  * no timer running on this destination
8627                                  * restart it.
8628                                  */
8629                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
8630                         }
8631                         /* Now send it, if there is anything to send :> */
8632                         if ((error = sctp_lowlevel_chunk_output(inp,
8633                             stcb,
8634                             net,
8635                             (struct sockaddr *)&net->ro._l_addr,
8636                             outchain,
8637                             auth_offset,
8638                             auth,
8639                             auth_keyid,
8640                             no_fragmentflg,
8641                             bundle_at,
8642                             asconf,
8643                             inp->sctp_lport, stcb->rport,
8644                             htonl(stcb->asoc.peer_vtag),
8645                             net->port, NULL,
8646                             0, 0,
8647                             so_locked))) {
8648                                 /* error, we could not output */
8649                                 if (error == ENOBUFS) {
8650                                         SCTP_STAT_INCR(sctps_lowlevelerr);
8651                                         asoc->ifp_had_enobuf = 1;
8652                                 }
8653                                 if (from_where == 0) {
8654                                         SCTP_STAT_INCR(sctps_lowlevelerrusr);
8655                                 }
8656                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
8657                                 if (hbflag) {
8658                                         if (*now_filled == 0) {
8659                                                 (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
8660                                                 *now_filled = 1;
8661                                                 *now = net->last_sent_time;
8662                                         } else {
8663                                                 net->last_sent_time = *now;
8664                                         }
8665                                         hbflag = 0;
8666                                 }
8667                                 if (error == EHOSTUNREACH) {
8668                                         /*
8669                                          * Destination went unreachable
8670                                          * during this send
8671                                          */
8672                                         sctp_move_chunks_from_net(stcb, net);
8673                                 }
8674                                 *reason_code = 6;
8675                                 /*-
8676                                  * I add this line to be paranoid. As far as
8677                                  * I can tell the continue, takes us back to
8678                                  * the top of the for, but just to make sure
8679                                  * I will reset these again here.
8680                                  */
8681                                 ctl_cnt = bundle_at = 0;
8682                                 continue;       /* This takes us back to the
8683                                                  * for() for the nets. */
8684                         } else {
8685                                 asoc->ifp_had_enobuf = 0;
8686                         }
8687                         endoutchain = NULL;
8688                         auth = NULL;
8689                         auth_offset = 0;
8690                         if (bundle_at || hbflag) {
8691                                 /* For data/asconf and hb set time */
8692                                 if (*now_filled == 0) {
8693                                         (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
8694                                         *now_filled = 1;
8695                                         *now = net->last_sent_time;
8696                                 } else {
8697                                         net->last_sent_time = *now;
8698                                 }
8699                         }
8700                         if (!no_out_cnt) {
8701                                 *num_out += (ctl_cnt + bundle_at);
8702                         }
8703                         if (bundle_at) {
8704                                 /* setup for a RTO measurement */
8705                                 tsns_sent = data_list[0]->rec.data.TSN_seq;
8706                                 /* fill time if not already filled */
8707                                 if (*now_filled == 0) {
8708                                         (void)SCTP_GETTIME_TIMEVAL(&asoc->time_last_sent);
8709                                         *now_filled = 1;
8710                                         *now = asoc->time_last_sent;
8711                                 } else {
8712                                         asoc->time_last_sent = *now;
8713                                 }
8714                                 if (net->rto_needed) {
8715                                         data_list[0]->do_rtt = 1;
8716                                         net->rto_needed = 0;
8717                                 }
8718                                 SCTP_STAT_INCR_BY(sctps_senddata, bundle_at);
8719                                 sctp_clean_up_datalist(stcb, asoc, data_list, bundle_at, net);
8720                         }
8721                         if (one_chunk) {
8722                                 break;
8723                         }
8724                 }
8725                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
8726                         sctp_log_cwnd(stcb, net, tsns_sent, SCTP_CWND_LOG_FROM_SEND);
8727                 }
8728         }
8729         if (old_start_at == NULL) {
8730                 old_start_at = start_at;
8731                 start_at = TAILQ_FIRST(&asoc->nets);
8732                 if (old_start_at)
8733                         goto again_one_more_time;
8734         }
8735         /*
8736          * At the end there should be no NON timed chunks hanging on this
8737          * queue.
8738          */
8739         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
8740                 sctp_log_cwnd(stcb, net, *num_out, SCTP_CWND_LOG_FROM_SEND);
8741         }
8742         if ((*num_out == 0) && (*reason_code == 0)) {
8743                 *reason_code = 4;
8744         } else {
8745                 *reason_code = 5;
8746         }
8747         sctp_clean_up_ctl(stcb, asoc, so_locked);
8748         return (0);
8749 }
8750
8751 void
8752 sctp_queue_op_err(struct sctp_tcb *stcb, struct mbuf *op_err)
8753 {
8754         /*-
8755          * Prepend a OPERATIONAL_ERROR chunk header and put on the end of
8756          * the control chunk queue.
8757          */
8758         struct sctp_chunkhdr *hdr;
8759         struct sctp_tmit_chunk *chk;
8760         struct mbuf *mat;
8761
8762         SCTP_TCB_LOCK_ASSERT(stcb);
8763         sctp_alloc_a_chunk(stcb, chk);
8764         if (chk == NULL) {
8765                 /* no memory */
8766                 sctp_m_freem(op_err);
8767                 return;
8768         }
8769         chk->copy_by_ref = 0;
8770         SCTP_BUF_PREPEND(op_err, sizeof(struct sctp_chunkhdr), M_NOWAIT);
8771         if (op_err == NULL) {
8772                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
8773                 return;
8774         }
8775         chk->send_size = 0;
8776         mat = op_err;
8777         while (mat != NULL) {
8778                 chk->send_size += SCTP_BUF_LEN(mat);
8779                 mat = SCTP_BUF_NEXT(mat);
8780         }
8781         chk->rec.chunk_id.id = SCTP_OPERATION_ERROR;
8782         chk->rec.chunk_id.can_take_data = 1;
8783         chk->sent = SCTP_DATAGRAM_UNSENT;
8784         chk->snd_count = 0;
8785         chk->flags = 0;
8786         chk->asoc = &stcb->asoc;
8787         chk->data = op_err;
8788         chk->whoTo = NULL;
8789         hdr = mtod(op_err, struct sctp_chunkhdr *);
8790         hdr->chunk_type = SCTP_OPERATION_ERROR;
8791         hdr->chunk_flags = 0;
8792         hdr->chunk_length = htons(chk->send_size);
8793         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue,
8794             chk,
8795             sctp_next);
8796         chk->asoc->ctrl_queue_cnt++;
8797 }
8798
8799 int
8800 sctp_send_cookie_echo(struct mbuf *m,
8801     int offset,
8802     struct sctp_tcb *stcb,
8803     struct sctp_nets *net)
8804 {
8805         /*-
8806          * pull out the cookie and put it at the front of the control chunk
8807          * queue.
8808          */
8809         int at;
8810         struct mbuf *cookie;
8811         struct sctp_paramhdr parm, *phdr;
8812         struct sctp_chunkhdr *hdr;
8813         struct sctp_tmit_chunk *chk;
8814         uint16_t ptype, plen;
8815
8816         /* First find the cookie in the param area */
8817         cookie = NULL;
8818         at = offset + sizeof(struct sctp_init_chunk);
8819
8820         SCTP_TCB_LOCK_ASSERT(stcb);
8821         do {
8822                 phdr = sctp_get_next_param(m, at, &parm, sizeof(parm));
8823                 if (phdr == NULL) {
8824                         return (-3);
8825                 }
8826                 ptype = ntohs(phdr->param_type);
8827                 plen = ntohs(phdr->param_length);
8828                 if (ptype == SCTP_STATE_COOKIE) {
8829                         int pad;
8830
8831                         /* found the cookie */
8832                         if ((pad = (plen % 4))) {
8833                                 plen += 4 - pad;
8834                         }
8835                         cookie = SCTP_M_COPYM(m, at, plen, M_NOWAIT);
8836                         if (cookie == NULL) {
8837                                 /* No memory */
8838                                 return (-2);
8839                         }
8840 #ifdef SCTP_MBUF_LOGGING
8841                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
8842                                 struct mbuf *mat;
8843
8844                                 for (mat = cookie; mat; mat = SCTP_BUF_NEXT(mat)) {
8845                                         if (SCTP_BUF_IS_EXTENDED(mat)) {
8846                                                 sctp_log_mb(mat, SCTP_MBUF_ICOPY);
8847                                         }
8848                                 }
8849                         }
8850 #endif
8851                         break;
8852                 }
8853                 at += SCTP_SIZE32(plen);
8854         } while (phdr);
8855         if (cookie == NULL) {
8856                 /* Did not find the cookie */
8857                 return (-3);
8858         }
8859         /* ok, we got the cookie lets change it into a cookie echo chunk */
8860
8861         /* first the change from param to cookie */
8862         hdr = mtod(cookie, struct sctp_chunkhdr *);
8863         hdr->chunk_type = SCTP_COOKIE_ECHO;
8864         hdr->chunk_flags = 0;
8865         /* get the chunk stuff now and place it in the FRONT of the queue */
8866         sctp_alloc_a_chunk(stcb, chk);
8867         if (chk == NULL) {
8868                 /* no memory */
8869                 sctp_m_freem(cookie);
8870                 return (-5);
8871         }
8872         chk->copy_by_ref = 0;
8873         chk->send_size = plen;
8874         chk->rec.chunk_id.id = SCTP_COOKIE_ECHO;
8875         chk->rec.chunk_id.can_take_data = 0;
8876         chk->sent = SCTP_DATAGRAM_UNSENT;
8877         chk->snd_count = 0;
8878         chk->flags = CHUNK_FLAGS_FRAGMENT_OK;
8879         chk->asoc = &stcb->asoc;
8880         chk->data = cookie;
8881         chk->whoTo = net;
8882         atomic_add_int(&chk->whoTo->ref_count, 1);
8883         TAILQ_INSERT_HEAD(&chk->asoc->control_send_queue, chk, sctp_next);
8884         chk->asoc->ctrl_queue_cnt++;
8885         return (0);
8886 }
8887
8888 void
8889 sctp_send_heartbeat_ack(struct sctp_tcb *stcb,
8890     struct mbuf *m,
8891     int offset,
8892     int chk_length,
8893     struct sctp_nets *net)
8894 {
8895         /*
8896          * take a HB request and make it into a HB ack and send it.
8897          */
8898         struct mbuf *outchain;
8899         struct sctp_chunkhdr *chdr;
8900         struct sctp_tmit_chunk *chk;
8901
8902
8903         if (net == NULL)
8904                 /* must have a net pointer */
8905                 return;
8906
8907         outchain = SCTP_M_COPYM(m, offset, chk_length, M_NOWAIT);
8908         if (outchain == NULL) {
8909                 /* gak out of memory */
8910                 return;
8911         }
8912 #ifdef SCTP_MBUF_LOGGING
8913         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
8914                 struct mbuf *mat;
8915
8916                 for (mat = outchain; mat; mat = SCTP_BUF_NEXT(mat)) {
8917                         if (SCTP_BUF_IS_EXTENDED(mat)) {
8918                                 sctp_log_mb(mat, SCTP_MBUF_ICOPY);
8919                         }
8920                 }
8921         }
8922 #endif
8923         chdr = mtod(outchain, struct sctp_chunkhdr *);
8924         chdr->chunk_type = SCTP_HEARTBEAT_ACK;
8925         chdr->chunk_flags = 0;
8926         if (chk_length % 4) {
8927                 /* need pad */
8928                 uint32_t cpthis = 0;
8929                 int padlen;
8930
8931                 padlen = 4 - (chk_length % 4);
8932                 m_copyback(outchain, chk_length, padlen, (caddr_t)&cpthis);
8933         }
8934         sctp_alloc_a_chunk(stcb, chk);
8935         if (chk == NULL) {
8936                 /* no memory */
8937                 sctp_m_freem(outchain);
8938                 return;
8939         }
8940         chk->copy_by_ref = 0;
8941         chk->send_size = chk_length;
8942         chk->rec.chunk_id.id = SCTP_HEARTBEAT_ACK;
8943         chk->rec.chunk_id.can_take_data = 1;
8944         chk->sent = SCTP_DATAGRAM_UNSENT;
8945         chk->snd_count = 0;
8946         chk->flags = 0;
8947         chk->asoc = &stcb->asoc;
8948         chk->data = outchain;
8949         chk->whoTo = net;
8950         atomic_add_int(&chk->whoTo->ref_count, 1);
8951         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
8952         chk->asoc->ctrl_queue_cnt++;
8953 }
8954
8955 void
8956 sctp_send_cookie_ack(struct sctp_tcb *stcb)
8957 {
8958         /* formulate and queue a cookie-ack back to sender */
8959         struct mbuf *cookie_ack;
8960         struct sctp_chunkhdr *hdr;
8961         struct sctp_tmit_chunk *chk;
8962
8963         cookie_ack = NULL;
8964         SCTP_TCB_LOCK_ASSERT(stcb);
8965
8966         cookie_ack = sctp_get_mbuf_for_msg(sizeof(struct sctp_chunkhdr), 0, M_NOWAIT, 1, MT_HEADER);
8967         if (cookie_ack == NULL) {
8968                 /* no mbuf's */
8969                 return;
8970         }
8971         SCTP_BUF_RESV_UF(cookie_ack, SCTP_MIN_OVERHEAD);
8972         sctp_alloc_a_chunk(stcb, chk);
8973         if (chk == NULL) {
8974                 /* no memory */
8975                 sctp_m_freem(cookie_ack);
8976                 return;
8977         }
8978         chk->copy_by_ref = 0;
8979         chk->send_size = sizeof(struct sctp_chunkhdr);
8980         chk->rec.chunk_id.id = SCTP_COOKIE_ACK;
8981         chk->rec.chunk_id.can_take_data = 1;
8982         chk->sent = SCTP_DATAGRAM_UNSENT;
8983         chk->snd_count = 0;
8984         chk->flags = 0;
8985         chk->asoc = &stcb->asoc;
8986         chk->data = cookie_ack;
8987         if (chk->asoc->last_control_chunk_from != NULL) {
8988                 chk->whoTo = chk->asoc->last_control_chunk_from;
8989                 atomic_add_int(&chk->whoTo->ref_count, 1);
8990         } else {
8991                 chk->whoTo = NULL;
8992         }
8993         hdr = mtod(cookie_ack, struct sctp_chunkhdr *);
8994         hdr->chunk_type = SCTP_COOKIE_ACK;
8995         hdr->chunk_flags = 0;
8996         hdr->chunk_length = htons(chk->send_size);
8997         SCTP_BUF_LEN(cookie_ack) = chk->send_size;
8998         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
8999         chk->asoc->ctrl_queue_cnt++;
9000         return;
9001 }
9002
9003
9004 void
9005 sctp_send_shutdown_ack(struct sctp_tcb *stcb, struct sctp_nets *net)
9006 {
9007         /* formulate and queue a SHUTDOWN-ACK back to the sender */
9008         struct mbuf *m_shutdown_ack;
9009         struct sctp_shutdown_ack_chunk *ack_cp;
9010         struct sctp_tmit_chunk *chk;
9011
9012         m_shutdown_ack = sctp_get_mbuf_for_msg(sizeof(struct sctp_shutdown_ack_chunk), 0, M_NOWAIT, 1, MT_HEADER);
9013         if (m_shutdown_ack == NULL) {
9014                 /* no mbuf's */
9015                 return;
9016         }
9017         SCTP_BUF_RESV_UF(m_shutdown_ack, SCTP_MIN_OVERHEAD);
9018         sctp_alloc_a_chunk(stcb, chk);
9019         if (chk == NULL) {
9020                 /* no memory */
9021                 sctp_m_freem(m_shutdown_ack);
9022                 return;
9023         }
9024         chk->copy_by_ref = 0;
9025         chk->send_size = sizeof(struct sctp_chunkhdr);
9026         chk->rec.chunk_id.id = SCTP_SHUTDOWN_ACK;
9027         chk->rec.chunk_id.can_take_data = 1;
9028         chk->sent = SCTP_DATAGRAM_UNSENT;
9029         chk->snd_count = 0;
9030         chk->flags = 0;
9031         chk->asoc = &stcb->asoc;
9032         chk->data = m_shutdown_ack;
9033         chk->whoTo = net;
9034         if (chk->whoTo) {
9035                 atomic_add_int(&chk->whoTo->ref_count, 1);
9036         }
9037         ack_cp = mtod(m_shutdown_ack, struct sctp_shutdown_ack_chunk *);
9038         ack_cp->ch.chunk_type = SCTP_SHUTDOWN_ACK;
9039         ack_cp->ch.chunk_flags = 0;
9040         ack_cp->ch.chunk_length = htons(chk->send_size);
9041         SCTP_BUF_LEN(m_shutdown_ack) = chk->send_size;
9042         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9043         chk->asoc->ctrl_queue_cnt++;
9044         return;
9045 }
9046
9047 void
9048 sctp_send_shutdown(struct sctp_tcb *stcb, struct sctp_nets *net)
9049 {
9050         /* formulate and queue a SHUTDOWN to the sender */
9051         struct mbuf *m_shutdown;
9052         struct sctp_shutdown_chunk *shutdown_cp;
9053         struct sctp_tmit_chunk *chk;
9054
9055         m_shutdown = sctp_get_mbuf_for_msg(sizeof(struct sctp_shutdown_chunk), 0, M_NOWAIT, 1, MT_HEADER);
9056         if (m_shutdown == NULL) {
9057                 /* no mbuf's */
9058                 return;
9059         }
9060         SCTP_BUF_RESV_UF(m_shutdown, SCTP_MIN_OVERHEAD);
9061         sctp_alloc_a_chunk(stcb, chk);
9062         if (chk == NULL) {
9063                 /* no memory */
9064                 sctp_m_freem(m_shutdown);
9065                 return;
9066         }
9067         chk->copy_by_ref = 0;
9068         chk->send_size = sizeof(struct sctp_shutdown_chunk);
9069         chk->rec.chunk_id.id = SCTP_SHUTDOWN;
9070         chk->rec.chunk_id.can_take_data = 1;
9071         chk->sent = SCTP_DATAGRAM_UNSENT;
9072         chk->snd_count = 0;
9073         chk->flags = 0;
9074         chk->asoc = &stcb->asoc;
9075         chk->data = m_shutdown;
9076         chk->whoTo = net;
9077         if (chk->whoTo) {
9078                 atomic_add_int(&chk->whoTo->ref_count, 1);
9079         }
9080         shutdown_cp = mtod(m_shutdown, struct sctp_shutdown_chunk *);
9081         shutdown_cp->ch.chunk_type = SCTP_SHUTDOWN;
9082         shutdown_cp->ch.chunk_flags = 0;
9083         shutdown_cp->ch.chunk_length = htons(chk->send_size);
9084         shutdown_cp->cumulative_tsn_ack = htonl(stcb->asoc.cumulative_tsn);
9085         SCTP_BUF_LEN(m_shutdown) = chk->send_size;
9086         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9087         chk->asoc->ctrl_queue_cnt++;
9088         return;
9089 }
9090
9091 void
9092 sctp_send_asconf(struct sctp_tcb *stcb, struct sctp_nets *net, int addr_locked)
9093 {
9094         /*
9095          * formulate and queue an ASCONF to the peer. ASCONF parameters
9096          * should be queued on the assoc queue.
9097          */
9098         struct sctp_tmit_chunk *chk;
9099         struct mbuf *m_asconf;
9100         int len;
9101
9102         SCTP_TCB_LOCK_ASSERT(stcb);
9103
9104         if ((!TAILQ_EMPTY(&stcb->asoc.asconf_send_queue)) &&
9105             (!sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_MULTIPLE_ASCONFS))) {
9106                 /* can't send a new one if there is one in flight already */
9107                 return;
9108         }
9109         /* compose an ASCONF chunk, maximum length is PMTU */
9110         m_asconf = sctp_compose_asconf(stcb, &len, addr_locked);
9111         if (m_asconf == NULL) {
9112                 return;
9113         }
9114         sctp_alloc_a_chunk(stcb, chk);
9115         if (chk == NULL) {
9116                 /* no memory */
9117                 sctp_m_freem(m_asconf);
9118                 return;
9119         }
9120         chk->copy_by_ref = 0;
9121         chk->data = m_asconf;
9122         chk->send_size = len;
9123         chk->rec.chunk_id.id = SCTP_ASCONF;
9124         chk->rec.chunk_id.can_take_data = 0;
9125         chk->sent = SCTP_DATAGRAM_UNSENT;
9126         chk->snd_count = 0;
9127         chk->flags = CHUNK_FLAGS_FRAGMENT_OK;
9128         chk->asoc = &stcb->asoc;
9129         chk->whoTo = net;
9130         if (chk->whoTo) {
9131                 atomic_add_int(&chk->whoTo->ref_count, 1);
9132         }
9133         TAILQ_INSERT_TAIL(&chk->asoc->asconf_send_queue, chk, sctp_next);
9134         chk->asoc->ctrl_queue_cnt++;
9135         return;
9136 }
9137
9138 void
9139 sctp_send_asconf_ack(struct sctp_tcb *stcb)
9140 {
9141         /*
9142          * formulate and queue a asconf-ack back to sender. the asconf-ack
9143          * must be stored in the tcb.
9144          */
9145         struct sctp_tmit_chunk *chk;
9146         struct sctp_asconf_ack *ack, *latest_ack;
9147         struct mbuf *m_ack;
9148         struct sctp_nets *net = NULL;
9149
9150         SCTP_TCB_LOCK_ASSERT(stcb);
9151         /* Get the latest ASCONF-ACK */
9152         latest_ack = TAILQ_LAST(&stcb->asoc.asconf_ack_sent, sctp_asconf_ackhead);
9153         if (latest_ack == NULL) {
9154                 return;
9155         }
9156         if (latest_ack->last_sent_to != NULL &&
9157             latest_ack->last_sent_to == stcb->asoc.last_control_chunk_from) {
9158                 /* we're doing a retransmission */
9159                 net = sctp_find_alternate_net(stcb, stcb->asoc.last_control_chunk_from, 0);
9160                 if (net == NULL) {
9161                         /* no alternate */
9162                         if (stcb->asoc.last_control_chunk_from == NULL) {
9163                                 if (stcb->asoc.alternate) {
9164                                         net = stcb->asoc.alternate;
9165                                 } else {
9166                                         net = stcb->asoc.primary_destination;
9167                                 }
9168                         } else {
9169                                 net = stcb->asoc.last_control_chunk_from;
9170                         }
9171                 }
9172         } else {
9173                 /* normal case */
9174                 if (stcb->asoc.last_control_chunk_from == NULL) {
9175                         if (stcb->asoc.alternate) {
9176                                 net = stcb->asoc.alternate;
9177                         } else {
9178                                 net = stcb->asoc.primary_destination;
9179                         }
9180                 } else {
9181                         net = stcb->asoc.last_control_chunk_from;
9182                 }
9183         }
9184         latest_ack->last_sent_to = net;
9185
9186         TAILQ_FOREACH(ack, &stcb->asoc.asconf_ack_sent, next) {
9187                 if (ack->data == NULL) {
9188                         continue;
9189                 }
9190                 /* copy the asconf_ack */
9191                 m_ack = SCTP_M_COPYM(ack->data, 0, M_COPYALL, M_NOWAIT);
9192                 if (m_ack == NULL) {
9193                         /* couldn't copy it */
9194                         return;
9195                 }
9196 #ifdef SCTP_MBUF_LOGGING
9197                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
9198                         struct mbuf *mat;
9199
9200                         for (mat = m_ack; mat; mat = SCTP_BUF_NEXT(mat)) {
9201                                 if (SCTP_BUF_IS_EXTENDED(mat)) {
9202                                         sctp_log_mb(mat, SCTP_MBUF_ICOPY);
9203                                 }
9204                         }
9205                 }
9206 #endif
9207
9208                 sctp_alloc_a_chunk(stcb, chk);
9209                 if (chk == NULL) {
9210                         /* no memory */
9211                         if (m_ack)
9212                                 sctp_m_freem(m_ack);
9213                         return;
9214                 }
9215                 chk->copy_by_ref = 0;
9216
9217                 chk->whoTo = net;
9218                 if (chk->whoTo) {
9219                         atomic_add_int(&chk->whoTo->ref_count, 1);
9220                 }
9221                 chk->data = m_ack;
9222                 chk->send_size = 0;
9223                 /* Get size */
9224                 chk->send_size = ack->len;
9225                 chk->rec.chunk_id.id = SCTP_ASCONF_ACK;
9226                 chk->rec.chunk_id.can_take_data = 1;
9227                 chk->sent = SCTP_DATAGRAM_UNSENT;
9228                 chk->snd_count = 0;
9229                 chk->flags |= CHUNK_FLAGS_FRAGMENT_OK;  /* XXX */
9230                 chk->asoc = &stcb->asoc;
9231
9232                 TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9233                 chk->asoc->ctrl_queue_cnt++;
9234         }
9235         return;
9236 }
9237
9238
9239 static int
9240 sctp_chunk_retransmission(struct sctp_inpcb *inp,
9241     struct sctp_tcb *stcb,
9242     struct sctp_association *asoc,
9243     int *cnt_out, struct timeval *now, int *now_filled, int *fr_done, int so_locked
9244 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
9245     SCTP_UNUSED
9246 #endif
9247 )
9248 {
9249         /*-
9250          * send out one MTU of retransmission. If fast_retransmit is
9251          * happening we ignore the cwnd. Otherwise we obey the cwnd and
9252          * rwnd. For a Cookie or Asconf in the control chunk queue we
9253          * retransmit them by themselves.
9254          *
9255          * For data chunks we will pick out the lowest TSN's in the sent_queue
9256          * marked for resend and bundle them all together (up to a MTU of
9257          * destination). The address to send to should have been
9258          * selected/changed where the retransmission was marked (i.e. in FR
9259          * or t3-timeout routines).
9260          */
9261         struct sctp_tmit_chunk *data_list[SCTP_MAX_DATA_BUNDLING];
9262         struct sctp_tmit_chunk *chk, *fwd;
9263         struct mbuf *m, *endofchain;
9264         struct sctp_nets *net = NULL;
9265         uint32_t tsns_sent = 0;
9266         int no_fragmentflg, bundle_at, cnt_thru;
9267         unsigned int mtu;
9268         int error, i, one_chunk, fwd_tsn, ctl_cnt, tmr_started;
9269         struct sctp_auth_chunk *auth = NULL;
9270         uint32_t auth_offset = 0;
9271         uint16_t auth_keyid;
9272         int override_ok = 1;
9273         int data_auth_reqd = 0;
9274         uint32_t dmtu = 0;
9275
9276         SCTP_TCB_LOCK_ASSERT(stcb);
9277         tmr_started = ctl_cnt = bundle_at = error = 0;
9278         no_fragmentflg = 1;
9279         fwd_tsn = 0;
9280         *cnt_out = 0;
9281         fwd = NULL;
9282         endofchain = m = NULL;
9283         auth_keyid = stcb->asoc.authinfo.active_keyid;
9284 #ifdef SCTP_AUDITING_ENABLED
9285         sctp_audit_log(0xC3, 1);
9286 #endif
9287         if ((TAILQ_EMPTY(&asoc->sent_queue)) &&
9288             (TAILQ_EMPTY(&asoc->control_send_queue))) {
9289                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "SCTP hits empty queue with cnt set to %d?\n",
9290                     asoc->sent_queue_retran_cnt);
9291                 asoc->sent_queue_cnt = 0;
9292                 asoc->sent_queue_cnt_removeable = 0;
9293                 /* send back 0/0 so we enter normal transmission */
9294                 *cnt_out = 0;
9295                 return (0);
9296         }
9297         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
9298                 if ((chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) ||
9299                     (chk->rec.chunk_id.id == SCTP_STREAM_RESET) ||
9300                     (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN)) {
9301                         if (chk->sent != SCTP_DATAGRAM_RESEND) {
9302                                 continue;
9303                         }
9304                         if (chk->rec.chunk_id.id == SCTP_STREAM_RESET) {
9305                                 if (chk != asoc->str_reset) {
9306                                         /*
9307                                          * not eligible for retran if its
9308                                          * not ours
9309                                          */
9310                                         continue;
9311                                 }
9312                         }
9313                         ctl_cnt++;
9314                         if (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN) {
9315                                 fwd_tsn = 1;
9316                         }
9317                         /*
9318                          * Add an AUTH chunk, if chunk requires it save the
9319                          * offset into the chain for AUTH
9320                          */
9321                         if ((auth == NULL) &&
9322                             (sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
9323                             stcb->asoc.peer_auth_chunks))) {
9324                                 m = sctp_add_auth_chunk(m, &endofchain,
9325                                     &auth, &auth_offset,
9326                                     stcb,
9327                                     chk->rec.chunk_id.id);
9328                                 SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
9329                         }
9330                         m = sctp_copy_mbufchain(chk->data, m, &endofchain, 0, chk->send_size, chk->copy_by_ref);
9331                         break;
9332                 }
9333         }
9334         one_chunk = 0;
9335         cnt_thru = 0;
9336         /* do we have control chunks to retransmit? */
9337         if (m != NULL) {
9338                 /* Start a timer no matter if we suceed or fail */
9339                 if (chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
9340                         sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, inp, stcb, chk->whoTo);
9341                 } else if (chk->rec.chunk_id.id == SCTP_ASCONF)
9342                         sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp, stcb, chk->whoTo);
9343                 chk->snd_count++;       /* update our count */
9344                 if ((error = sctp_lowlevel_chunk_output(inp, stcb, chk->whoTo,
9345                     (struct sockaddr *)&chk->whoTo->ro._l_addr, m,
9346                     auth_offset, auth, stcb->asoc.authinfo.active_keyid,
9347                     no_fragmentflg, 0, 0,
9348                     inp->sctp_lport, stcb->rport, htonl(stcb->asoc.peer_vtag),
9349                     chk->whoTo->port, NULL,
9350                     0, 0,
9351                     so_locked))) {
9352                         SCTP_STAT_INCR(sctps_lowlevelerr);
9353                         return (error);
9354                 }
9355                 endofchain = NULL;
9356                 auth = NULL;
9357                 auth_offset = 0;
9358                 /*
9359                  * We don't want to mark the net->sent time here since this
9360                  * we use this for HB and retrans cannot measure RTT
9361                  */
9362                 /* (void)SCTP_GETTIME_TIMEVAL(&chk->whoTo->last_sent_time); */
9363                 *cnt_out += 1;
9364                 chk->sent = SCTP_DATAGRAM_SENT;
9365                 sctp_ucount_decr(stcb->asoc.sent_queue_retran_cnt);
9366                 if (fwd_tsn == 0) {
9367                         return (0);
9368                 } else {
9369                         /* Clean up the fwd-tsn list */
9370                         sctp_clean_up_ctl(stcb, asoc, so_locked);
9371                         return (0);
9372                 }
9373         }
9374         /*
9375          * Ok, it is just data retransmission we need to do or that and a
9376          * fwd-tsn with it all.
9377          */
9378         if (TAILQ_EMPTY(&asoc->sent_queue)) {
9379                 return (SCTP_RETRAN_DONE);
9380         }
9381         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED) ||
9382             (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT)) {
9383                 /* not yet open, resend the cookie and that is it */
9384                 return (1);
9385         }
9386 #ifdef SCTP_AUDITING_ENABLED
9387         sctp_auditing(20, inp, stcb, NULL);
9388 #endif
9389         data_auth_reqd = sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks);
9390         TAILQ_FOREACH(chk, &asoc->sent_queue, sctp_next) {
9391                 if (chk->sent != SCTP_DATAGRAM_RESEND) {
9392                         /* No, not sent to this net or not ready for rtx */
9393                         continue;
9394                 }
9395                 if (chk->data == NULL) {
9396                         SCTP_PRINTF("TSN:%x chk->snd_count:%d chk->sent:%d can't retran - no data\n",
9397                             chk->rec.data.TSN_seq, chk->snd_count, chk->sent);
9398                         continue;
9399                 }
9400                 if ((SCTP_BASE_SYSCTL(sctp_max_retran_chunk)) &&
9401                     (chk->snd_count >= SCTP_BASE_SYSCTL(sctp_max_retran_chunk))) {
9402                         /* Gak, we have exceeded max unlucky retran, abort! */
9403                         SCTP_PRINTF("Gak, chk->snd_count:%d >= max:%d - send abort\n",
9404                             chk->snd_count,
9405                             SCTP_BASE_SYSCTL(sctp_max_retran_chunk));
9406                         atomic_add_int(&stcb->asoc.refcnt, 1);
9407                         sctp_abort_an_association(stcb->sctp_ep, stcb, NULL, so_locked);
9408                         SCTP_TCB_LOCK(stcb);
9409                         atomic_subtract_int(&stcb->asoc.refcnt, 1);
9410                         return (SCTP_RETRAN_EXIT);
9411                 }
9412                 /* pick up the net */
9413                 net = chk->whoTo;
9414                 switch (net->ro._l_addr.sa.sa_family) {
9415 #ifdef INET
9416                 case AF_INET:
9417                         mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
9418                         break;
9419 #endif
9420 #ifdef INET6
9421                 case AF_INET6:
9422                         mtu = net->mtu - SCTP_MIN_OVERHEAD;
9423                         break;
9424 #endif
9425                 default:
9426                         /* TSNH */
9427                         mtu = net->mtu;
9428                         break;
9429                 }
9430
9431                 if ((asoc->peers_rwnd < mtu) && (asoc->total_flight > 0)) {
9432                         /* No room in peers rwnd */
9433                         uint32_t tsn;
9434
9435                         tsn = asoc->last_acked_seq + 1;
9436                         if (tsn == chk->rec.data.TSN_seq) {
9437                                 /*
9438                                  * we make a special exception for this
9439                                  * case. The peer has no rwnd but is missing
9440                                  * the lowest chunk.. which is probably what
9441                                  * is holding up the rwnd.
9442                                  */
9443                                 goto one_chunk_around;
9444                         }
9445                         return (1);
9446                 }
9447 one_chunk_around:
9448                 if (asoc->peers_rwnd < mtu) {
9449                         one_chunk = 1;
9450                         if ((asoc->peers_rwnd == 0) &&
9451                             (asoc->total_flight == 0)) {
9452                                 chk->window_probe = 1;
9453                                 chk->whoTo->window_probe = 1;
9454                         }
9455                 }
9456 #ifdef SCTP_AUDITING_ENABLED
9457                 sctp_audit_log(0xC3, 2);
9458 #endif
9459                 bundle_at = 0;
9460                 m = NULL;
9461                 net->fast_retran_ip = 0;
9462                 if (chk->rec.data.doing_fast_retransmit == 0) {
9463                         /*
9464                          * if no FR in progress skip destination that have
9465                          * flight_size > cwnd.
9466                          */
9467                         if (net->flight_size >= net->cwnd) {
9468                                 continue;
9469                         }
9470                 } else {
9471                         /*
9472                          * Mark the destination net to have FR recovery
9473                          * limits put on it.
9474                          */
9475                         *fr_done = 1;
9476                         net->fast_retran_ip = 1;
9477                 }
9478
9479                 /*
9480                  * if no AUTH is yet included and this chunk requires it,
9481                  * make sure to account for it.  We don't apply the size
9482                  * until the AUTH chunk is actually added below in case
9483                  * there is no room for this chunk.
9484                  */
9485                 if (data_auth_reqd && (auth == NULL)) {
9486                         dmtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
9487                 } else
9488                         dmtu = 0;
9489
9490                 if ((chk->send_size <= (mtu - dmtu)) ||
9491                     (chk->flags & CHUNK_FLAGS_FRAGMENT_OK)) {
9492                         /* ok we will add this one */
9493                         if (data_auth_reqd) {
9494                                 if (auth == NULL) {
9495                                         m = sctp_add_auth_chunk(m,
9496                                             &endofchain,
9497                                             &auth,
9498                                             &auth_offset,
9499                                             stcb,
9500                                             SCTP_DATA);
9501                                         auth_keyid = chk->auth_keyid;
9502                                         override_ok = 0;
9503                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
9504                                 } else if (override_ok) {
9505                                         auth_keyid = chk->auth_keyid;
9506                                         override_ok = 0;
9507                                 } else if (chk->auth_keyid != auth_keyid) {
9508                                         /* different keyid, so done bundling */
9509                                         break;
9510                                 }
9511                         }
9512                         m = sctp_copy_mbufchain(chk->data, m, &endofchain, 0, chk->send_size, chk->copy_by_ref);
9513                         if (m == NULL) {
9514                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
9515                                 return (ENOMEM);
9516                         }
9517                         /* Do clear IP_DF ? */
9518                         if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
9519                                 no_fragmentflg = 0;
9520                         }
9521                         /* upate our MTU size */
9522                         if (mtu > (chk->send_size + dmtu))
9523                                 mtu -= (chk->send_size + dmtu);
9524                         else
9525                                 mtu = 0;
9526                         data_list[bundle_at++] = chk;
9527                         if (one_chunk && (asoc->total_flight <= 0)) {
9528                                 SCTP_STAT_INCR(sctps_windowprobed);
9529                         }
9530                 }
9531                 if (one_chunk == 0) {
9532                         /*
9533                          * now are there anymore forward from chk to pick
9534                          * up?
9535                          */
9536                         for (fwd = TAILQ_NEXT(chk, sctp_next); fwd != NULL; fwd = TAILQ_NEXT(fwd, sctp_next)) {
9537                                 if (fwd->sent != SCTP_DATAGRAM_RESEND) {
9538                                         /* Nope, not for retran */
9539                                         continue;
9540                                 }
9541                                 if (fwd->whoTo != net) {
9542                                         /* Nope, not the net in question */
9543                                         continue;
9544                                 }
9545                                 if (data_auth_reqd && (auth == NULL)) {
9546                                         dmtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
9547                                 } else
9548                                         dmtu = 0;
9549                                 if (fwd->send_size <= (mtu - dmtu)) {
9550                                         if (data_auth_reqd) {
9551                                                 if (auth == NULL) {
9552                                                         m = sctp_add_auth_chunk(m,
9553                                                             &endofchain,
9554                                                             &auth,
9555                                                             &auth_offset,
9556                                                             stcb,
9557                                                             SCTP_DATA);
9558                                                         auth_keyid = fwd->auth_keyid;
9559                                                         override_ok = 0;
9560                                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
9561                                                 } else if (override_ok) {
9562                                                         auth_keyid = fwd->auth_keyid;
9563                                                         override_ok = 0;
9564                                                 } else if (fwd->auth_keyid != auth_keyid) {
9565                                                         /*
9566                                                          * different keyid,
9567                                                          * so done bundling
9568                                                          */
9569                                                         break;
9570                                                 }
9571                                         }
9572                                         m = sctp_copy_mbufchain(fwd->data, m, &endofchain, 0, fwd->send_size, fwd->copy_by_ref);
9573                                         if (m == NULL) {
9574                                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
9575                                                 return (ENOMEM);
9576                                         }
9577                                         /* Do clear IP_DF ? */
9578                                         if (fwd->flags & CHUNK_FLAGS_FRAGMENT_OK) {
9579                                                 no_fragmentflg = 0;
9580                                         }
9581                                         /* upate our MTU size */
9582                                         if (mtu > (fwd->send_size + dmtu))
9583                                                 mtu -= (fwd->send_size + dmtu);
9584                                         else
9585                                                 mtu = 0;
9586                                         data_list[bundle_at++] = fwd;
9587                                         if (bundle_at >= SCTP_MAX_DATA_BUNDLING) {
9588                                                 break;
9589                                         }
9590                                 } else {
9591                                         /* can't fit so we are done */
9592                                         break;
9593                                 }
9594                         }
9595                 }
9596                 /* Is there something to send for this destination? */
9597                 if (m) {
9598                         /*
9599                          * No matter if we fail/or suceed we should start a
9600                          * timer. A failure is like a lost IP packet :-)
9601                          */
9602                         if (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
9603                                 /*
9604                                  * no timer running on this destination
9605                                  * restart it.
9606                                  */
9607                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
9608                                 tmr_started = 1;
9609                         }
9610                         /* Now lets send it, if there is anything to send :> */
9611                         if ((error = sctp_lowlevel_chunk_output(inp, stcb, net,
9612                             (struct sockaddr *)&net->ro._l_addr, m,
9613                             auth_offset, auth, auth_keyid,
9614                             no_fragmentflg, 0, 0,
9615                             inp->sctp_lport, stcb->rport, htonl(stcb->asoc.peer_vtag),
9616                             net->port, NULL,
9617                             0, 0,
9618                             so_locked))) {
9619                                 /* error, we could not output */
9620                                 SCTP_STAT_INCR(sctps_lowlevelerr);
9621                                 return (error);
9622                         }
9623                         endofchain = NULL;
9624                         auth = NULL;
9625                         auth_offset = 0;
9626                         /* For HB's */
9627                         /*
9628                          * We don't want to mark the net->sent time here
9629                          * since this we use this for HB and retrans cannot
9630                          * measure RTT
9631                          */
9632                         /* (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time); */
9633
9634                         /* For auto-close */
9635                         cnt_thru++;
9636                         if (*now_filled == 0) {
9637                                 (void)SCTP_GETTIME_TIMEVAL(&asoc->time_last_sent);
9638                                 *now = asoc->time_last_sent;
9639                                 *now_filled = 1;
9640                         } else {
9641                                 asoc->time_last_sent = *now;
9642                         }
9643                         *cnt_out += bundle_at;
9644 #ifdef SCTP_AUDITING_ENABLED
9645                         sctp_audit_log(0xC4, bundle_at);
9646 #endif
9647                         if (bundle_at) {
9648                                 tsns_sent = data_list[0]->rec.data.TSN_seq;
9649                         }
9650                         for (i = 0; i < bundle_at; i++) {
9651                                 SCTP_STAT_INCR(sctps_sendretransdata);
9652                                 data_list[i]->sent = SCTP_DATAGRAM_SENT;
9653                                 /*
9654                                  * When we have a revoked data, and we
9655                                  * retransmit it, then we clear the revoked
9656                                  * flag since this flag dictates if we
9657                                  * subtracted from the fs
9658                                  */
9659                                 if (data_list[i]->rec.data.chunk_was_revoked) {
9660                                         /* Deflate the cwnd */
9661                                         data_list[i]->whoTo->cwnd -= data_list[i]->book_size;
9662                                         data_list[i]->rec.data.chunk_was_revoked = 0;
9663                                 }
9664                                 data_list[i]->snd_count++;
9665                                 sctp_ucount_decr(asoc->sent_queue_retran_cnt);
9666                                 /* record the time */
9667                                 data_list[i]->sent_rcv_time = asoc->time_last_sent;
9668                                 if (data_list[i]->book_size_scale) {
9669                                         /*
9670                                          * need to double the book size on
9671                                          * this one
9672                                          */
9673                                         data_list[i]->book_size_scale = 0;
9674                                         /*
9675                                          * Since we double the booksize, we
9676                                          * must also double the output queue
9677                                          * size, since this get shrunk when
9678                                          * we free by this amount.
9679                                          */
9680                                         atomic_add_int(&((asoc)->total_output_queue_size), data_list[i]->book_size);
9681                                         data_list[i]->book_size *= 2;
9682
9683
9684                                 } else {
9685                                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_RWND_ENABLE) {
9686                                                 sctp_log_rwnd(SCTP_DECREASE_PEER_RWND,
9687                                                     asoc->peers_rwnd, data_list[i]->send_size, SCTP_BASE_SYSCTL(sctp_peer_chunk_oh));
9688                                         }
9689                                         asoc->peers_rwnd = sctp_sbspace_sub(asoc->peers_rwnd,
9690                                             (uint32_t) (data_list[i]->send_size +
9691                                             SCTP_BASE_SYSCTL(sctp_peer_chunk_oh)));
9692                                 }
9693                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
9694                                         sctp_misc_ints(SCTP_FLIGHT_LOG_UP_RSND,
9695                                             data_list[i]->whoTo->flight_size,
9696                                             data_list[i]->book_size,
9697                                             (uintptr_t) data_list[i]->whoTo,
9698                                             data_list[i]->rec.data.TSN_seq);
9699                                 }
9700                                 sctp_flight_size_increase(data_list[i]);
9701                                 sctp_total_flight_increase(stcb, data_list[i]);
9702                                 if (asoc->peers_rwnd < stcb->sctp_ep->sctp_ep.sctp_sws_sender) {
9703                                         /* SWS sender side engages */
9704                                         asoc->peers_rwnd = 0;
9705                                 }
9706                                 if ((i == 0) &&
9707                                     (data_list[i]->rec.data.doing_fast_retransmit)) {
9708                                         SCTP_STAT_INCR(sctps_sendfastretrans);
9709                                         if ((data_list[i] == TAILQ_FIRST(&asoc->sent_queue)) &&
9710                                             (tmr_started == 0)) {
9711                                                 /*-
9712                                                  * ok we just fast-retrans'd
9713                                                  * the lowest TSN, i.e the
9714                                                  * first on the list. In
9715                                                  * this case we want to give
9716                                                  * some more time to get a
9717                                                  * SACK back without a
9718                                                  * t3-expiring.
9719                                                  */
9720                                                 sctp_timer_stop(SCTP_TIMER_TYPE_SEND, inp, stcb, net,
9721                                                     SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_4);
9722                                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
9723                                         }
9724                                 }
9725                         }
9726                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
9727                                 sctp_log_cwnd(stcb, net, tsns_sent, SCTP_CWND_LOG_FROM_RESEND);
9728                         }
9729 #ifdef SCTP_AUDITING_ENABLED
9730                         sctp_auditing(21, inp, stcb, NULL);
9731 #endif
9732                 } else {
9733                         /* None will fit */
9734                         return (1);
9735                 }
9736                 if (asoc->sent_queue_retran_cnt <= 0) {
9737                         /* all done we have no more to retran */
9738                         asoc->sent_queue_retran_cnt = 0;
9739                         break;
9740                 }
9741                 if (one_chunk) {
9742                         /* No more room in rwnd */
9743                         return (1);
9744                 }
9745                 /* stop the for loop here. we sent out a packet */
9746                 break;
9747         }
9748         return (0);
9749 }
9750
9751 static void
9752 sctp_timer_validation(struct sctp_inpcb *inp,
9753     struct sctp_tcb *stcb,
9754     struct sctp_association *asoc)
9755 {
9756         struct sctp_nets *net;
9757
9758         /* Validate that a timer is running somewhere */
9759         TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
9760                 if (SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
9761                         /* Here is a timer */
9762                         return;
9763                 }
9764         }
9765         SCTP_TCB_LOCK_ASSERT(stcb);
9766         /* Gak, we did not have a timer somewhere */
9767         SCTPDBG(SCTP_DEBUG_OUTPUT3, "Deadlock avoided starting timer on a dest at retran\n");
9768         if (asoc->alternate) {
9769                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, asoc->alternate);
9770         } else {
9771                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, asoc->primary_destination);
9772         }
9773         return;
9774 }
9775
9776 void
9777 sctp_chunk_output(struct sctp_inpcb *inp,
9778     struct sctp_tcb *stcb,
9779     int from_where,
9780     int so_locked
9781 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
9782     SCTP_UNUSED
9783 #endif
9784 )
9785 {
9786         /*-
9787          * Ok this is the generic chunk service queue. we must do the
9788          * following:
9789          * - See if there are retransmits pending, if so we must
9790          *   do these first.
9791          * - Service the stream queue that is next, moving any
9792          *   message (note I must get a complete message i.e.
9793          *   FIRST/MIDDLE and LAST to the out queue in one pass) and assigning
9794          *   TSN's
9795          * - Check to see if the cwnd/rwnd allows any output, if so we
9796          *   go ahead and fomulate and send the low level chunks. Making sure
9797          *   to combine any control in the control chunk queue also.
9798          */
9799         struct sctp_association *asoc;
9800         struct sctp_nets *net;
9801         int error = 0, num_out = 0, tot_out = 0, ret = 0, reason_code = 0;
9802         unsigned int burst_cnt = 0;
9803         struct timeval now;
9804         int now_filled = 0;
9805         int nagle_on;
9806         int frag_point = sctp_get_frag_point(stcb, &stcb->asoc);
9807         int un_sent = 0;
9808         int fr_done;
9809         unsigned int tot_frs = 0;
9810
9811         asoc = &stcb->asoc;
9812         /* The Nagle algorithm is only applied when handling a send call. */
9813         if (from_where == SCTP_OUTPUT_FROM_USR_SEND) {
9814                 if (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_NODELAY)) {
9815                         nagle_on = 0;
9816                 } else {
9817                         nagle_on = 1;
9818                 }
9819         } else {
9820                 nagle_on = 0;
9821         }
9822         SCTP_TCB_LOCK_ASSERT(stcb);
9823
9824         un_sent = (stcb->asoc.total_output_queue_size - stcb->asoc.total_flight);
9825
9826         if ((un_sent <= 0) &&
9827             (TAILQ_EMPTY(&asoc->control_send_queue)) &&
9828             (TAILQ_EMPTY(&asoc->asconf_send_queue)) &&
9829             (asoc->sent_queue_retran_cnt == 0)) {
9830                 /* Nothing to do unless there is something to be sent left */
9831                 return;
9832         }
9833         /*
9834          * Do we have something to send, data or control AND a sack timer
9835          * running, if so piggy-back the sack.
9836          */
9837         if (SCTP_OS_TIMER_PENDING(&stcb->asoc.dack_timer.timer)) {
9838                 sctp_send_sack(stcb, so_locked);
9839                 (void)SCTP_OS_TIMER_STOP(&stcb->asoc.dack_timer.timer);
9840         }
9841         while (asoc->sent_queue_retran_cnt) {
9842                 /*-
9843                  * Ok, it is retransmission time only, we send out only ONE
9844                  * packet with a single call off to the retran code.
9845                  */
9846                 if (from_where == SCTP_OUTPUT_FROM_COOKIE_ACK) {
9847                         /*-
9848                          * Special hook for handling cookiess discarded
9849                          * by peer that carried data. Send cookie-ack only
9850                          * and then the next call with get the retran's.
9851                          */
9852                         (void)sctp_med_chunk_output(inp, stcb, asoc, &num_out, &reason_code, 1,
9853                             from_where,
9854                             &now, &now_filled, frag_point, so_locked);
9855                         return;
9856                 } else if (from_where != SCTP_OUTPUT_FROM_HB_TMR) {
9857                         /* if its not from a HB then do it */
9858                         fr_done = 0;
9859                         ret = sctp_chunk_retransmission(inp, stcb, asoc, &num_out, &now, &now_filled, &fr_done, so_locked);
9860                         if (fr_done) {
9861                                 tot_frs++;
9862                         }
9863                 } else {
9864                         /*
9865                          * its from any other place, we don't allow retran
9866                          * output (only control)
9867                          */
9868                         ret = 1;
9869                 }
9870                 if (ret > 0) {
9871                         /* Can't send anymore */
9872                         /*-
9873                          * now lets push out control by calling med-level
9874                          * output once. this assures that we WILL send HB's
9875                          * if queued too.
9876                          */
9877                         (void)sctp_med_chunk_output(inp, stcb, asoc, &num_out, &reason_code, 1,
9878                             from_where,
9879                             &now, &now_filled, frag_point, so_locked);
9880 #ifdef SCTP_AUDITING_ENABLED
9881                         sctp_auditing(8, inp, stcb, NULL);
9882 #endif
9883                         sctp_timer_validation(inp, stcb, asoc);
9884                         return;
9885                 }
9886                 if (ret < 0) {
9887                         /*-
9888                          * The count was off.. retran is not happening so do
9889                          * the normal retransmission.
9890                          */
9891 #ifdef SCTP_AUDITING_ENABLED
9892                         sctp_auditing(9, inp, stcb, NULL);
9893 #endif
9894                         if (ret == SCTP_RETRAN_EXIT) {
9895                                 return;
9896                         }
9897                         break;
9898                 }
9899                 if (from_where == SCTP_OUTPUT_FROM_T3) {
9900                         /* Only one transmission allowed out of a timeout */
9901 #ifdef SCTP_AUDITING_ENABLED
9902                         sctp_auditing(10, inp, stcb, NULL);
9903 #endif
9904                         /* Push out any control */
9905                         (void)sctp_med_chunk_output(inp, stcb, asoc, &num_out, &reason_code, 1, from_where,
9906                             &now, &now_filled, frag_point, so_locked);
9907                         return;
9908                 }
9909                 if ((asoc->fr_max_burst > 0) && (tot_frs >= asoc->fr_max_burst)) {
9910                         /* Hit FR burst limit */
9911                         return;
9912                 }
9913                 if ((num_out == 0) && (ret == 0)) {
9914                         /* No more retrans to send */
9915                         break;
9916                 }
9917         }
9918 #ifdef SCTP_AUDITING_ENABLED
9919         sctp_auditing(12, inp, stcb, NULL);
9920 #endif
9921         /* Check for bad destinations, if they exist move chunks around. */
9922         TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
9923                 if (!(net->dest_state & SCTP_ADDR_REACHABLE)) {
9924                         /*-
9925                          * if possible move things off of this address we
9926                          * still may send below due to the dormant state but
9927                          * we try to find an alternate address to send to
9928                          * and if we have one we move all queued data on the
9929                          * out wheel to this alternate address.
9930                          */
9931                         if (net->ref_count > 1)
9932                                 sctp_move_chunks_from_net(stcb, net);
9933                 } else {
9934                         /*-
9935                          * if ((asoc->sat_network) || (net->addr_is_local))
9936                          * { burst_limit = asoc->max_burst *
9937                          * SCTP_SAT_NETWORK_BURST_INCR; }
9938                          */
9939                         if (asoc->max_burst > 0) {
9940                                 if (SCTP_BASE_SYSCTL(sctp_use_cwnd_based_maxburst)) {
9941                                         if ((net->flight_size + (asoc->max_burst * net->mtu)) < net->cwnd) {
9942                                                 /*
9943                                                  * JRS - Use the congestion
9944                                                  * control given in the
9945                                                  * congestion control module
9946                                                  */
9947                                                 asoc->cc_functions.sctp_cwnd_update_after_output(stcb, net, asoc->max_burst);
9948                                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_MAXBURST_ENABLE) {
9949                                                         sctp_log_maxburst(stcb, net, 0, asoc->max_burst, SCTP_MAX_BURST_APPLIED);
9950                                                 }
9951                                                 SCTP_STAT_INCR(sctps_maxburstqueued);
9952                                         }
9953                                         net->fast_retran_ip = 0;
9954                                 } else {
9955                                         if (net->flight_size == 0) {
9956                                                 /*
9957                                                  * Should be decaying the
9958                                                  * cwnd here
9959                                                  */
9960                                                 ;
9961                                         }
9962                                 }
9963                         }
9964                 }
9965
9966         }
9967         burst_cnt = 0;
9968         do {
9969                 error = sctp_med_chunk_output(inp, stcb, asoc, &num_out,
9970                     &reason_code, 0, from_where,
9971                     &now, &now_filled, frag_point, so_locked);
9972                 if (error) {
9973                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Error %d was returned from med-c-op\n", error);
9974                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_MAXBURST_ENABLE) {
9975                                 sctp_log_maxburst(stcb, asoc->primary_destination, error, burst_cnt, SCTP_MAX_BURST_ERROR_STOP);
9976                         }
9977                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
9978                                 sctp_log_cwnd(stcb, NULL, error, SCTP_SEND_NOW_COMPLETES);
9979                                 sctp_log_cwnd(stcb, NULL, 0xdeadbeef, SCTP_SEND_NOW_COMPLETES);
9980                         }
9981                         break;
9982                 }
9983                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "m-c-o put out %d\n", num_out);
9984
9985                 tot_out += num_out;
9986                 burst_cnt++;
9987                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
9988                         sctp_log_cwnd(stcb, NULL, num_out, SCTP_SEND_NOW_COMPLETES);
9989                         if (num_out == 0) {
9990                                 sctp_log_cwnd(stcb, NULL, reason_code, SCTP_SEND_NOW_COMPLETES);
9991                         }
9992                 }
9993                 if (nagle_on) {
9994                         /*
9995                          * When the Nagle algorithm is used, look at how
9996                          * much is unsent, then if its smaller than an MTU
9997                          * and we have data in flight we stop, except if we
9998                          * are handling a fragmented user message.
9999                          */
10000                         un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
10001                             (stcb->asoc.stream_queue_cnt * sizeof(struct sctp_data_chunk)));
10002                         if ((un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD)) &&
10003                             (stcb->asoc.total_flight > 0) &&
10004                             ((stcb->asoc.locked_on_sending == NULL) ||
10005                             sctp_is_feature_on(inp, SCTP_PCB_FLAGS_EXPLICIT_EOR))) {
10006                                 break;
10007                         }
10008                 }
10009                 if (TAILQ_EMPTY(&asoc->control_send_queue) &&
10010                     TAILQ_EMPTY(&asoc->send_queue) &&
10011                     stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc)) {
10012                         /* Nothing left to send */
10013                         break;
10014                 }
10015                 if ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) <= 0) {
10016                         /* Nothing left to send */
10017                         break;
10018                 }
10019         } while (num_out &&
10020             ((asoc->max_burst == 0) ||
10021             SCTP_BASE_SYSCTL(sctp_use_cwnd_based_maxburst) ||
10022             (burst_cnt < asoc->max_burst)));
10023
10024         if (SCTP_BASE_SYSCTL(sctp_use_cwnd_based_maxburst) == 0) {
10025                 if ((asoc->max_burst > 0) && (burst_cnt >= asoc->max_burst)) {
10026                         SCTP_STAT_INCR(sctps_maxburstqueued);
10027                         asoc->burst_limit_applied = 1;
10028                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_MAXBURST_ENABLE) {
10029                                 sctp_log_maxburst(stcb, asoc->primary_destination, 0, burst_cnt, SCTP_MAX_BURST_APPLIED);
10030                         }
10031                 } else {
10032                         asoc->burst_limit_applied = 0;
10033                 }
10034         }
10035         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
10036                 sctp_log_cwnd(stcb, NULL, tot_out, SCTP_SEND_NOW_COMPLETES);
10037         }
10038         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Ok, we have put out %d chunks\n",
10039             tot_out);
10040
10041         /*-
10042          * Now we need to clean up the control chunk chain if a ECNE is on
10043          * it. It must be marked as UNSENT again so next call will continue
10044          * to send it until such time that we get a CWR, to remove it.
10045          */
10046         if (stcb->asoc.ecn_echo_cnt_onq)
10047                 sctp_fix_ecn_echo(asoc);
10048         return;
10049 }
10050
10051
10052 int
10053 sctp_output(
10054     struct sctp_inpcb *inp,
10055     struct mbuf *m,
10056     struct sockaddr *addr,
10057     struct mbuf *control,
10058     struct thread *p,
10059     int flags)
10060 {
10061         if (inp == NULL) {
10062                 SCTP_LTRACE_ERR_RET_PKT(m, inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
10063                 return (EINVAL);
10064         }
10065         if (inp->sctp_socket == NULL) {
10066                 SCTP_LTRACE_ERR_RET_PKT(m, inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
10067                 return (EINVAL);
10068         }
10069         return (sctp_sosend(inp->sctp_socket,
10070             addr,
10071             (struct uio *)NULL,
10072             m,
10073             control,
10074             flags, p
10075             ));
10076 }
10077
10078 void
10079 send_forward_tsn(struct sctp_tcb *stcb,
10080     struct sctp_association *asoc)
10081 {
10082         struct sctp_tmit_chunk *chk;
10083         struct sctp_forward_tsn_chunk *fwdtsn;
10084         uint32_t advance_peer_ack_point;
10085
10086         SCTP_TCB_LOCK_ASSERT(stcb);
10087         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
10088                 if (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN) {
10089                         /* mark it to unsent */
10090                         chk->sent = SCTP_DATAGRAM_UNSENT;
10091                         chk->snd_count = 0;
10092                         /* Do we correct its output location? */
10093                         if (chk->whoTo) {
10094                                 sctp_free_remote_addr(chk->whoTo);
10095                                 chk->whoTo = NULL;
10096                         }
10097                         goto sctp_fill_in_rest;
10098                 }
10099         }
10100         /* Ok if we reach here we must build one */
10101         sctp_alloc_a_chunk(stcb, chk);
10102         if (chk == NULL) {
10103                 return;
10104         }
10105         asoc->fwd_tsn_cnt++;
10106         chk->copy_by_ref = 0;
10107         chk->rec.chunk_id.id = SCTP_FORWARD_CUM_TSN;
10108         chk->rec.chunk_id.can_take_data = 0;
10109         chk->asoc = asoc;
10110         chk->whoTo = NULL;
10111         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
10112         if (chk->data == NULL) {
10113                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
10114                 return;
10115         }
10116         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
10117         chk->sent = SCTP_DATAGRAM_UNSENT;
10118         chk->snd_count = 0;
10119         TAILQ_INSERT_TAIL(&asoc->control_send_queue, chk, sctp_next);
10120         asoc->ctrl_queue_cnt++;
10121 sctp_fill_in_rest:
10122         /*-
10123          * Here we go through and fill out the part that deals with
10124          * stream/seq of the ones we skip.
10125          */
10126         SCTP_BUF_LEN(chk->data) = 0;
10127         {
10128                 struct sctp_tmit_chunk *at, *tp1, *last;
10129                 struct sctp_strseq *strseq;
10130                 unsigned int cnt_of_space, i, ovh;
10131                 unsigned int space_needed;
10132                 unsigned int cnt_of_skipped = 0;
10133
10134                 TAILQ_FOREACH(at, &asoc->sent_queue, sctp_next) {
10135                         if ((at->sent != SCTP_FORWARD_TSN_SKIP) &&
10136                             (at->sent != SCTP_DATAGRAM_NR_ACKED)) {
10137                                 /* no more to look at */
10138                                 break;
10139                         }
10140                         if (at->rec.data.rcv_flags & SCTP_DATA_UNORDERED) {
10141                                 /* We don't report these */
10142                                 continue;
10143                         }
10144                         cnt_of_skipped++;
10145                 }
10146                 space_needed = (sizeof(struct sctp_forward_tsn_chunk) +
10147                     (cnt_of_skipped * sizeof(struct sctp_strseq)));
10148
10149                 cnt_of_space = M_TRAILINGSPACE(chk->data);
10150
10151                 if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
10152                         ovh = SCTP_MIN_OVERHEAD;
10153                 } else {
10154                         ovh = SCTP_MIN_V4_OVERHEAD;
10155                 }
10156                 if (cnt_of_space > (asoc->smallest_mtu - ovh)) {
10157                         /* trim to a mtu size */
10158                         cnt_of_space = asoc->smallest_mtu - ovh;
10159                 }
10160                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_TRY_ADVANCE) {
10161                         sctp_misc_ints(SCTP_FWD_TSN_CHECK,
10162                             0xff, 0, cnt_of_skipped,
10163                             asoc->advanced_peer_ack_point);
10164
10165                 }
10166                 advance_peer_ack_point = asoc->advanced_peer_ack_point;
10167                 if (cnt_of_space < space_needed) {
10168                         /*-
10169                          * ok we must trim down the chunk by lowering the
10170                          * advance peer ack point.
10171                          */
10172                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_TRY_ADVANCE) {
10173                                 sctp_misc_ints(SCTP_FWD_TSN_CHECK,
10174                                     0xff, 0xff, cnt_of_space,
10175                                     space_needed);
10176                         }
10177                         cnt_of_skipped = cnt_of_space - sizeof(struct sctp_forward_tsn_chunk);
10178                         cnt_of_skipped /= sizeof(struct sctp_strseq);
10179                         /*-
10180                          * Go through and find the TSN that will be the one
10181                          * we report.
10182                          */
10183                         at = TAILQ_FIRST(&asoc->sent_queue);
10184                         if (at != NULL) {
10185                                 for (i = 0; i < cnt_of_skipped; i++) {
10186                                         tp1 = TAILQ_NEXT(at, sctp_next);
10187                                         if (tp1 == NULL) {
10188                                                 break;
10189                                         }
10190                                         at = tp1;
10191                                 }
10192                         }
10193                         if (at && SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_TRY_ADVANCE) {
10194                                 sctp_misc_ints(SCTP_FWD_TSN_CHECK,
10195                                     0xff, cnt_of_skipped, at->rec.data.TSN_seq,
10196                                     asoc->advanced_peer_ack_point);
10197                         }
10198                         last = at;
10199                         /*-
10200                          * last now points to last one I can report, update
10201                          * peer ack point
10202                          */
10203                         if (last)
10204                                 advance_peer_ack_point = last->rec.data.TSN_seq;
10205                         space_needed = sizeof(struct sctp_forward_tsn_chunk) +
10206                             cnt_of_skipped * sizeof(struct sctp_strseq);
10207                 }
10208                 chk->send_size = space_needed;
10209                 /* Setup the chunk */
10210                 fwdtsn = mtod(chk->data, struct sctp_forward_tsn_chunk *);
10211                 fwdtsn->ch.chunk_length = htons(chk->send_size);
10212                 fwdtsn->ch.chunk_flags = 0;
10213                 fwdtsn->ch.chunk_type = SCTP_FORWARD_CUM_TSN;
10214                 fwdtsn->new_cumulative_tsn = htonl(advance_peer_ack_point);
10215                 SCTP_BUF_LEN(chk->data) = chk->send_size;
10216                 fwdtsn++;
10217                 /*-
10218                  * Move pointer to after the fwdtsn and transfer to the
10219                  * strseq pointer.
10220                  */
10221                 strseq = (struct sctp_strseq *)fwdtsn;
10222                 /*-
10223                  * Now populate the strseq list. This is done blindly
10224                  * without pulling out duplicate stream info. This is
10225                  * inefficent but won't harm the process since the peer will
10226                  * look at these in sequence and will thus release anything.
10227                  * It could mean we exceed the PMTU and chop off some that
10228                  * we could have included.. but this is unlikely (aka 1432/4
10229                  * would mean 300+ stream seq's would have to be reported in
10230                  * one FWD-TSN. With a bit of work we can later FIX this to
10231                  * optimize and pull out duplcates.. but it does add more
10232                  * overhead. So for now... not!
10233                  */
10234                 at = TAILQ_FIRST(&asoc->sent_queue);
10235                 for (i = 0; i < cnt_of_skipped; i++) {
10236                         tp1 = TAILQ_NEXT(at, sctp_next);
10237                         if (tp1 == NULL)
10238                                 break;
10239                         if (at->rec.data.rcv_flags & SCTP_DATA_UNORDERED) {
10240                                 /* We don't report these */
10241                                 i--;
10242                                 at = tp1;
10243                                 continue;
10244                         }
10245                         if (at->rec.data.TSN_seq == advance_peer_ack_point) {
10246                                 at->rec.data.fwd_tsn_cnt = 0;
10247                         }
10248                         strseq->stream = ntohs(at->rec.data.stream_number);
10249                         strseq->sequence = ntohs(at->rec.data.stream_seq);
10250                         strseq++;
10251                         at = tp1;
10252                 }
10253         }
10254         return;
10255 }
10256
10257 void
10258 sctp_send_sack(struct sctp_tcb *stcb, int so_locked
10259 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
10260     SCTP_UNUSED
10261 #endif
10262 )
10263 {
10264         /*-
10265          * Queue up a SACK or NR-SACK in the control queue.
10266          * We must first check to see if a SACK or NR-SACK is
10267          * somehow on the control queue.
10268          * If so, we will take and and remove the old one.
10269          */
10270         struct sctp_association *asoc;
10271         struct sctp_tmit_chunk *chk, *a_chk;
10272         struct sctp_sack_chunk *sack;
10273         struct sctp_nr_sack_chunk *nr_sack;
10274         struct sctp_gap_ack_block *gap_descriptor;
10275         struct sack_track *selector;
10276         int mergeable = 0;
10277         int offset;
10278         caddr_t limit;
10279         uint32_t *dup;
10280         int limit_reached = 0;
10281         unsigned int i, siz, j;
10282         unsigned int num_gap_blocks = 0, num_nr_gap_blocks = 0, space;
10283         int num_dups = 0;
10284         int space_req;
10285         uint32_t highest_tsn;
10286         uint8_t flags;
10287         uint8_t type;
10288         uint8_t tsn_map;
10289
10290         if ((stcb->asoc.sctp_nr_sack_on_off == 1) &&
10291             (stcb->asoc.peer_supports_nr_sack == 1)) {
10292                 type = SCTP_NR_SELECTIVE_ACK;
10293         } else {
10294                 type = SCTP_SELECTIVE_ACK;
10295         }
10296         a_chk = NULL;
10297         asoc = &stcb->asoc;
10298         SCTP_TCB_LOCK_ASSERT(stcb);
10299         if (asoc->last_data_chunk_from == NULL) {
10300                 /* Hmm we never received anything */
10301                 return;
10302         }
10303         sctp_slide_mapping_arrays(stcb);
10304         sctp_set_rwnd(stcb, asoc);
10305         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
10306                 if (chk->rec.chunk_id.id == type) {
10307                         /* Hmm, found a sack already on queue, remove it */
10308                         TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
10309                         asoc->ctrl_queue_cnt--;
10310                         a_chk = chk;
10311                         if (a_chk->data) {
10312                                 sctp_m_freem(a_chk->data);
10313                                 a_chk->data = NULL;
10314                         }
10315                         if (a_chk->whoTo) {
10316                                 sctp_free_remote_addr(a_chk->whoTo);
10317                                 a_chk->whoTo = NULL;
10318                         }
10319                         break;
10320                 }
10321         }
10322         if (a_chk == NULL) {
10323                 sctp_alloc_a_chunk(stcb, a_chk);
10324                 if (a_chk == NULL) {
10325                         /* No memory so we drop the idea, and set a timer */
10326                         if (stcb->asoc.delayed_ack) {
10327                                 sctp_timer_stop(SCTP_TIMER_TYPE_RECV,
10328                                     stcb->sctp_ep, stcb, NULL, SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_5);
10329                                 sctp_timer_start(SCTP_TIMER_TYPE_RECV,
10330                                     stcb->sctp_ep, stcb, NULL);
10331                         } else {
10332                                 stcb->asoc.send_sack = 1;
10333                         }
10334                         return;
10335                 }
10336                 a_chk->copy_by_ref = 0;
10337                 a_chk->rec.chunk_id.id = type;
10338                 a_chk->rec.chunk_id.can_take_data = 1;
10339         }
10340         /* Clear our pkt counts */
10341         asoc->data_pkts_seen = 0;
10342
10343         a_chk->asoc = asoc;
10344         a_chk->snd_count = 0;
10345         a_chk->send_size = 0;   /* fill in later */
10346         a_chk->sent = SCTP_DATAGRAM_UNSENT;
10347         a_chk->whoTo = NULL;
10348
10349         if ((asoc->numduptsns) ||
10350             (!(asoc->last_data_chunk_from->dest_state & SCTP_ADDR_REACHABLE))) {
10351                 /*-
10352                  * Ok, we have some duplicates or the destination for the
10353                  * sack is unreachable, lets see if we can select an
10354                  * alternate than asoc->last_data_chunk_from
10355                  */
10356                 if ((asoc->last_data_chunk_from->dest_state & SCTP_ADDR_REACHABLE) &&
10357                     (asoc->used_alt_onsack > asoc->numnets)) {
10358                         /* We used an alt last time, don't this time */
10359                         a_chk->whoTo = NULL;
10360                 } else {
10361                         asoc->used_alt_onsack++;
10362                         a_chk->whoTo = sctp_find_alternate_net(stcb, asoc->last_data_chunk_from, 0);
10363                 }
10364                 if (a_chk->whoTo == NULL) {
10365                         /* Nope, no alternate */
10366                         a_chk->whoTo = asoc->last_data_chunk_from;
10367                         asoc->used_alt_onsack = 0;
10368                 }
10369         } else {
10370                 /*
10371                  * No duplicates so we use the last place we received data
10372                  * from.
10373                  */
10374                 asoc->used_alt_onsack = 0;
10375                 a_chk->whoTo = asoc->last_data_chunk_from;
10376         }
10377         if (a_chk->whoTo) {
10378                 atomic_add_int(&a_chk->whoTo->ref_count, 1);
10379         }
10380         if (SCTP_TSN_GT(asoc->highest_tsn_inside_map, asoc->highest_tsn_inside_nr_map)) {
10381                 highest_tsn = asoc->highest_tsn_inside_map;
10382         } else {
10383                 highest_tsn = asoc->highest_tsn_inside_nr_map;
10384         }
10385         if (highest_tsn == asoc->cumulative_tsn) {
10386                 /* no gaps */
10387                 if (type == SCTP_SELECTIVE_ACK) {
10388                         space_req = sizeof(struct sctp_sack_chunk);
10389                 } else {
10390                         space_req = sizeof(struct sctp_nr_sack_chunk);
10391                 }
10392         } else {
10393                 /* gaps get a cluster */
10394                 space_req = MCLBYTES;
10395         }
10396         /* Ok now lets formulate a MBUF with our sack */
10397         a_chk->data = sctp_get_mbuf_for_msg(space_req, 0, M_NOWAIT, 1, MT_DATA);
10398         if ((a_chk->data == NULL) ||
10399             (a_chk->whoTo == NULL)) {
10400                 /* rats, no mbuf memory */
10401                 if (a_chk->data) {
10402                         /* was a problem with the destination */
10403                         sctp_m_freem(a_chk->data);
10404                         a_chk->data = NULL;
10405                 }
10406                 sctp_free_a_chunk(stcb, a_chk, so_locked);
10407                 /* sa_ignore NO_NULL_CHK */
10408                 if (stcb->asoc.delayed_ack) {
10409                         sctp_timer_stop(SCTP_TIMER_TYPE_RECV,
10410                             stcb->sctp_ep, stcb, NULL, SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_6);
10411                         sctp_timer_start(SCTP_TIMER_TYPE_RECV,
10412                             stcb->sctp_ep, stcb, NULL);
10413                 } else {
10414                         stcb->asoc.send_sack = 1;
10415                 }
10416                 return;
10417         }
10418         /* ok, lets go through and fill it in */
10419         SCTP_BUF_RESV_UF(a_chk->data, SCTP_MIN_OVERHEAD);
10420         space = M_TRAILINGSPACE(a_chk->data);
10421         if (space > (a_chk->whoTo->mtu - SCTP_MIN_OVERHEAD)) {
10422                 space = (a_chk->whoTo->mtu - SCTP_MIN_OVERHEAD);
10423         }
10424         limit = mtod(a_chk->data, caddr_t);
10425         limit += space;
10426
10427         flags = 0;
10428
10429         if ((asoc->sctp_cmt_on_off > 0) &&
10430             SCTP_BASE_SYSCTL(sctp_cmt_use_dac)) {
10431                 /*-
10432                  * CMT DAC algorithm: If 2 (i.e., 0x10) packets have been
10433                  * received, then set high bit to 1, else 0. Reset
10434                  * pkts_rcvd.
10435                  */
10436                 flags |= (asoc->cmt_dac_pkts_rcvd << 6);
10437                 asoc->cmt_dac_pkts_rcvd = 0;
10438         }
10439 #ifdef SCTP_ASOCLOG_OF_TSNS
10440         stcb->asoc.cumack_logsnt[stcb->asoc.cumack_log_atsnt] = asoc->cumulative_tsn;
10441         stcb->asoc.cumack_log_atsnt++;
10442         if (stcb->asoc.cumack_log_atsnt >= SCTP_TSN_LOG_SIZE) {
10443                 stcb->asoc.cumack_log_atsnt = 0;
10444         }
10445 #endif
10446         /* reset the readers interpretation */
10447         stcb->freed_by_sorcv_sincelast = 0;
10448
10449         if (type == SCTP_SELECTIVE_ACK) {
10450                 sack = mtod(a_chk->data, struct sctp_sack_chunk *);
10451                 nr_sack = NULL;
10452                 gap_descriptor = (struct sctp_gap_ack_block *)((caddr_t)sack + sizeof(struct sctp_sack_chunk));
10453                 if (highest_tsn > asoc->mapping_array_base_tsn) {
10454                         siz = (((highest_tsn - asoc->mapping_array_base_tsn) + 1) + 7) / 8;
10455                 } else {
10456                         siz = (((MAX_TSN - highest_tsn) + 1) + highest_tsn + 7) / 8;
10457                 }
10458         } else {
10459                 sack = NULL;
10460                 nr_sack = mtod(a_chk->data, struct sctp_nr_sack_chunk *);
10461                 gap_descriptor = (struct sctp_gap_ack_block *)((caddr_t)nr_sack + sizeof(struct sctp_nr_sack_chunk));
10462                 if (asoc->highest_tsn_inside_map > asoc->mapping_array_base_tsn) {
10463                         siz = (((asoc->highest_tsn_inside_map - asoc->mapping_array_base_tsn) + 1) + 7) / 8;
10464                 } else {
10465                         siz = (((MAX_TSN - asoc->mapping_array_base_tsn) + 1) + asoc->highest_tsn_inside_map + 7) / 8;
10466                 }
10467         }
10468
10469         if (SCTP_TSN_GT(asoc->mapping_array_base_tsn, asoc->cumulative_tsn)) {
10470                 offset = 1;
10471         } else {
10472                 offset = asoc->mapping_array_base_tsn - asoc->cumulative_tsn;
10473         }
10474         if (((type == SCTP_SELECTIVE_ACK) &&
10475             SCTP_TSN_GT(highest_tsn, asoc->cumulative_tsn)) ||
10476             ((type == SCTP_NR_SELECTIVE_ACK) &&
10477             SCTP_TSN_GT(asoc->highest_tsn_inside_map, asoc->cumulative_tsn))) {
10478                 /* we have a gap .. maybe */
10479                 for (i = 0; i < siz; i++) {
10480                         tsn_map = asoc->mapping_array[i];
10481                         if (type == SCTP_SELECTIVE_ACK) {
10482                                 tsn_map |= asoc->nr_mapping_array[i];
10483                         }
10484                         if (i == 0) {
10485                                 /*
10486                                  * Clear all bits corresponding to TSNs
10487                                  * smaller or equal to the cumulative TSN.
10488                                  */
10489                                 tsn_map &= (~0 << (1 - offset));
10490                         }
10491                         selector = &sack_array[tsn_map];
10492                         if (mergeable && selector->right_edge) {
10493                                 /*
10494                                  * Backup, left and right edges were ok to
10495                                  * merge.
10496                                  */
10497                                 num_gap_blocks--;
10498                                 gap_descriptor--;
10499                         }
10500                         if (selector->num_entries == 0)
10501                                 mergeable = 0;
10502                         else {
10503                                 for (j = 0; j < selector->num_entries; j++) {
10504                                         if (mergeable && selector->right_edge) {
10505                                                 /*
10506                                                  * do a merge by NOT setting
10507                                                  * the left side
10508                                                  */
10509                                                 mergeable = 0;
10510                                         } else {
10511                                                 /*
10512                                                  * no merge, set the left
10513                                                  * side
10514                                                  */
10515                                                 mergeable = 0;
10516                                                 gap_descriptor->start = htons((selector->gaps[j].start + offset));
10517                                         }
10518                                         gap_descriptor->end = htons((selector->gaps[j].end + offset));
10519                                         num_gap_blocks++;
10520                                         gap_descriptor++;
10521                                         if (((caddr_t)gap_descriptor + sizeof(struct sctp_gap_ack_block)) > limit) {
10522                                                 /* no more room */
10523                                                 limit_reached = 1;
10524                                                 break;
10525                                         }
10526                                 }
10527                                 if (selector->left_edge) {
10528                                         mergeable = 1;
10529                                 }
10530                         }
10531                         if (limit_reached) {
10532                                 /* Reached the limit stop */
10533                                 break;
10534                         }
10535                         offset += 8;
10536                 }
10537         }
10538         if ((type == SCTP_NR_SELECTIVE_ACK) &&
10539             (limit_reached == 0)) {
10540
10541                 mergeable = 0;
10542
10543                 if (asoc->highest_tsn_inside_nr_map > asoc->mapping_array_base_tsn) {
10544                         siz = (((asoc->highest_tsn_inside_nr_map - asoc->mapping_array_base_tsn) + 1) + 7) / 8;
10545                 } else {
10546                         siz = (((MAX_TSN - asoc->mapping_array_base_tsn) + 1) + asoc->highest_tsn_inside_nr_map + 7) / 8;
10547                 }
10548
10549                 if (SCTP_TSN_GT(asoc->mapping_array_base_tsn, asoc->cumulative_tsn)) {
10550                         offset = 1;
10551                 } else {
10552                         offset = asoc->mapping_array_base_tsn - asoc->cumulative_tsn;
10553                 }
10554                 if (SCTP_TSN_GT(asoc->highest_tsn_inside_nr_map, asoc->cumulative_tsn)) {
10555                         /* we have a gap .. maybe */
10556                         for (i = 0; i < siz; i++) {
10557                                 tsn_map = asoc->nr_mapping_array[i];
10558                                 if (i == 0) {
10559                                         /*
10560                                          * Clear all bits corresponding to
10561                                          * TSNs smaller or equal to the
10562                                          * cumulative TSN.
10563                                          */
10564                                         tsn_map &= (~0 << (1 - offset));
10565                                 }
10566                                 selector = &sack_array[tsn_map];
10567                                 if (mergeable && selector->right_edge) {
10568                                         /*
10569                                          * Backup, left and right edges were
10570                                          * ok to merge.
10571                                          */
10572                                         num_nr_gap_blocks--;
10573                                         gap_descriptor--;
10574                                 }
10575                                 if (selector->num_entries == 0)
10576                                         mergeable = 0;
10577                                 else {
10578                                         for (j = 0; j < selector->num_entries; j++) {
10579                                                 if (mergeable && selector->right_edge) {
10580                                                         /*
10581                                                          * do a merge by NOT
10582                                                          * setting the left
10583                                                          * side
10584                                                          */
10585                                                         mergeable = 0;
10586                                                 } else {
10587                                                         /*
10588                                                          * no merge, set the
10589                                                          * left side
10590                                                          */
10591                                                         mergeable = 0;
10592                                                         gap_descriptor->start = htons((selector->gaps[j].start + offset));
10593                                                 }
10594                                                 gap_descriptor->end = htons((selector->gaps[j].end + offset));
10595                                                 num_nr_gap_blocks++;
10596                                                 gap_descriptor++;
10597                                                 if (((caddr_t)gap_descriptor + sizeof(struct sctp_gap_ack_block)) > limit) {
10598                                                         /* no more room */
10599                                                         limit_reached = 1;
10600                                                         break;
10601                                                 }
10602                                         }
10603                                         if (selector->left_edge) {
10604                                                 mergeable = 1;
10605                                         }
10606                                 }
10607                                 if (limit_reached) {
10608                                         /* Reached the limit stop */
10609                                         break;
10610                                 }
10611                                 offset += 8;
10612                         }
10613                 }
10614         }
10615         /* now we must add any dups we are going to report. */
10616         if ((limit_reached == 0) && (asoc->numduptsns)) {
10617                 dup = (uint32_t *) gap_descriptor;
10618                 for (i = 0; i < asoc->numduptsns; i++) {
10619                         *dup = htonl(asoc->dup_tsns[i]);
10620                         dup++;
10621                         num_dups++;
10622                         if (((caddr_t)dup + sizeof(uint32_t)) > limit) {
10623                                 /* no more room */
10624                                 break;
10625                         }
10626                 }
10627                 asoc->numduptsns = 0;
10628         }
10629         /*
10630          * now that the chunk is prepared queue it to the control chunk
10631          * queue.
10632          */
10633         if (type == SCTP_SELECTIVE_ACK) {
10634                 a_chk->send_size = sizeof(struct sctp_sack_chunk) +
10635                     (num_gap_blocks + num_nr_gap_blocks) * sizeof(struct sctp_gap_ack_block) +
10636                     num_dups * sizeof(int32_t);
10637                 SCTP_BUF_LEN(a_chk->data) = a_chk->send_size;
10638                 sack->sack.cum_tsn_ack = htonl(asoc->cumulative_tsn);
10639                 sack->sack.a_rwnd = htonl(asoc->my_rwnd);
10640                 sack->sack.num_gap_ack_blks = htons(num_gap_blocks);
10641                 sack->sack.num_dup_tsns = htons(num_dups);
10642                 sack->ch.chunk_type = type;
10643                 sack->ch.chunk_flags = flags;
10644                 sack->ch.chunk_length = htons(a_chk->send_size);
10645         } else {
10646                 a_chk->send_size = sizeof(struct sctp_nr_sack_chunk) +
10647                     (num_gap_blocks + num_nr_gap_blocks) * sizeof(struct sctp_gap_ack_block) +
10648                     num_dups * sizeof(int32_t);
10649                 SCTP_BUF_LEN(a_chk->data) = a_chk->send_size;
10650                 nr_sack->nr_sack.cum_tsn_ack = htonl(asoc->cumulative_tsn);
10651                 nr_sack->nr_sack.a_rwnd = htonl(asoc->my_rwnd);
10652                 nr_sack->nr_sack.num_gap_ack_blks = htons(num_gap_blocks);
10653                 nr_sack->nr_sack.num_nr_gap_ack_blks = htons(num_nr_gap_blocks);
10654                 nr_sack->nr_sack.num_dup_tsns = htons(num_dups);
10655                 nr_sack->nr_sack.reserved = 0;
10656                 nr_sack->ch.chunk_type = type;
10657                 nr_sack->ch.chunk_flags = flags;
10658                 nr_sack->ch.chunk_length = htons(a_chk->send_size);
10659         }
10660         TAILQ_INSERT_TAIL(&asoc->control_send_queue, a_chk, sctp_next);
10661         asoc->my_last_reported_rwnd = asoc->my_rwnd;
10662         asoc->ctrl_queue_cnt++;
10663         asoc->send_sack = 0;
10664         SCTP_STAT_INCR(sctps_sendsacks);
10665         return;
10666 }
10667
10668 void
10669 sctp_send_abort_tcb(struct sctp_tcb *stcb, struct mbuf *operr, int so_locked
10670 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
10671     SCTP_UNUSED
10672 #endif
10673 )
10674 {
10675         struct mbuf *m_abort, *m, *m_last;
10676         struct mbuf *m_out, *m_end = NULL;
10677         struct sctp_abort_chunk *abort;
10678         struct sctp_auth_chunk *auth = NULL;
10679         struct sctp_nets *net;
10680         uint32_t vtag;
10681         uint32_t auth_offset = 0;
10682         uint16_t cause_len, chunk_len, padding_len;
10683
10684         SCTP_TCB_LOCK_ASSERT(stcb);
10685         /*-
10686          * Add an AUTH chunk, if chunk requires it and save the offset into
10687          * the chain for AUTH
10688          */
10689         if (sctp_auth_is_required_chunk(SCTP_ABORT_ASSOCIATION,
10690             stcb->asoc.peer_auth_chunks)) {
10691                 m_out = sctp_add_auth_chunk(NULL, &m_end, &auth, &auth_offset,
10692                     stcb, SCTP_ABORT_ASSOCIATION);
10693                 SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
10694         } else {
10695                 m_out = NULL;
10696         }
10697         m_abort = sctp_get_mbuf_for_msg(sizeof(struct sctp_abort_chunk), 0, M_NOWAIT, 1, MT_HEADER);
10698         if (m_abort == NULL) {
10699                 if (m_out) {
10700                         sctp_m_freem(m_out);
10701                 }
10702                 if (operr) {
10703                         sctp_m_freem(operr);
10704                 }
10705                 return;
10706         }
10707         /* link in any error */
10708         SCTP_BUF_NEXT(m_abort) = operr;
10709         cause_len = 0;
10710         m_last = NULL;
10711         for (m = operr; m; m = SCTP_BUF_NEXT(m)) {
10712                 cause_len += (uint16_t) SCTP_BUF_LEN(m);
10713                 if (SCTP_BUF_NEXT(m) == NULL) {
10714                         m_last = m;
10715                 }
10716         }
10717         SCTP_BUF_LEN(m_abort) = sizeof(struct sctp_abort_chunk);
10718         chunk_len = (uint16_t) sizeof(struct sctp_abort_chunk) + cause_len;
10719         padding_len = SCTP_SIZE32(chunk_len) - chunk_len;
10720         if (m_out == NULL) {
10721                 /* NO Auth chunk prepended, so reserve space in front */
10722                 SCTP_BUF_RESV_UF(m_abort, SCTP_MIN_OVERHEAD);
10723                 m_out = m_abort;
10724         } else {
10725                 /* Put AUTH chunk at the front of the chain */
10726                 SCTP_BUF_NEXT(m_end) = m_abort;
10727         }
10728         if (stcb->asoc.alternate) {
10729                 net = stcb->asoc.alternate;
10730         } else {
10731                 net = stcb->asoc.primary_destination;
10732         }
10733         /* Fill in the ABORT chunk header. */
10734         abort = mtod(m_abort, struct sctp_abort_chunk *);
10735         abort->ch.chunk_type = SCTP_ABORT_ASSOCIATION;
10736         if (stcb->asoc.peer_vtag == 0) {
10737                 /* This happens iff the assoc is in COOKIE-WAIT state. */
10738                 vtag = stcb->asoc.my_vtag;
10739                 abort->ch.chunk_flags = SCTP_HAD_NO_TCB;
10740         } else {
10741                 vtag = stcb->asoc.peer_vtag;
10742                 abort->ch.chunk_flags = 0;
10743         }
10744         abort->ch.chunk_length = htons(chunk_len);
10745         /* Add padding, if necessary. */
10746         if (padding_len > 0) {
10747                 if ((m_last == NULL) || sctp_add_pad_tombuf(m_last, padding_len)) {
10748                         sctp_m_freem(m_out);
10749                         return;
10750                 }
10751         }
10752         (void)sctp_lowlevel_chunk_output(stcb->sctp_ep, stcb, net,
10753             (struct sockaddr *)&net->ro._l_addr,
10754             m_out, auth_offset, auth, stcb->asoc.authinfo.active_keyid, 1, 0, 0,
10755             stcb->sctp_ep->sctp_lport, stcb->rport, htonl(vtag),
10756             stcb->asoc.primary_destination->port, NULL,
10757             0, 0,
10758             so_locked);
10759         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
10760 }
10761
10762 void
10763 sctp_send_shutdown_complete(struct sctp_tcb *stcb,
10764     struct sctp_nets *net,
10765     int reflect_vtag)
10766 {
10767         /* formulate and SEND a SHUTDOWN-COMPLETE */
10768         struct mbuf *m_shutdown_comp;
10769         struct sctp_shutdown_complete_chunk *shutdown_complete;
10770         uint32_t vtag;
10771         uint8_t flags;
10772
10773         m_shutdown_comp = sctp_get_mbuf_for_msg(sizeof(struct sctp_chunkhdr), 0, M_NOWAIT, 1, MT_HEADER);
10774         if (m_shutdown_comp == NULL) {
10775                 /* no mbuf's */
10776                 return;
10777         }
10778         if (reflect_vtag) {
10779                 flags = SCTP_HAD_NO_TCB;
10780                 vtag = stcb->asoc.my_vtag;
10781         } else {
10782                 flags = 0;
10783                 vtag = stcb->asoc.peer_vtag;
10784         }
10785         shutdown_complete = mtod(m_shutdown_comp, struct sctp_shutdown_complete_chunk *);
10786         shutdown_complete->ch.chunk_type = SCTP_SHUTDOWN_COMPLETE;
10787         shutdown_complete->ch.chunk_flags = flags;
10788         shutdown_complete->ch.chunk_length = htons(sizeof(struct sctp_shutdown_complete_chunk));
10789         SCTP_BUF_LEN(m_shutdown_comp) = sizeof(struct sctp_shutdown_complete_chunk);
10790         (void)sctp_lowlevel_chunk_output(stcb->sctp_ep, stcb, net,
10791             (struct sockaddr *)&net->ro._l_addr,
10792             m_shutdown_comp, 0, NULL, 0, 1, 0, 0,
10793             stcb->sctp_ep->sctp_lport, stcb->rport,
10794             htonl(vtag),
10795             net->port, NULL,
10796             0, 0,
10797             SCTP_SO_NOT_LOCKED);
10798         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
10799         return;
10800 }
10801
10802 static void
10803 sctp_send_resp_msg(struct sockaddr *src, struct sockaddr *dst,
10804     struct sctphdr *sh, uint32_t vtag,
10805     uint8_t type, struct mbuf *cause,
10806     uint8_t use_mflowid, uint32_t mflowid,
10807     uint32_t vrf_id, uint16_t port)
10808 {
10809         struct mbuf *o_pak;
10810         struct mbuf *mout;
10811         struct sctphdr *shout;
10812         struct sctp_chunkhdr *ch;
10813         struct udphdr *udp;
10814         int len, cause_len, padding_len;
10815
10816 #if defined(INET) || defined(INET6)
10817         int ret;
10818
10819 #endif
10820 #ifdef INET
10821         struct sockaddr_in *src_sin, *dst_sin;
10822         struct ip *ip;
10823
10824 #endif
10825 #ifdef INET6
10826         struct sockaddr_in6 *src_sin6, *dst_sin6;
10827         struct ip6_hdr *ip6;
10828
10829 #endif
10830
10831         /* Compute the length of the cause and add final padding. */
10832         cause_len = 0;
10833         if (cause != NULL) {
10834                 struct mbuf *m_at, *m_last = NULL;
10835
10836                 for (m_at = cause; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
10837                         if (SCTP_BUF_NEXT(m_at) == NULL)
10838                                 m_last = m_at;
10839                         cause_len += SCTP_BUF_LEN(m_at);
10840                 }
10841                 padding_len = cause_len % 4;
10842                 if (padding_len != 0) {
10843                         padding_len = 4 - padding_len;
10844                 }
10845                 if (padding_len != 0) {
10846                         if (sctp_add_pad_tombuf(m_last, padding_len)) {
10847                                 sctp_m_freem(cause);
10848                                 return;
10849                         }
10850                 }
10851         } else {
10852                 padding_len = 0;
10853         }
10854         /* Get an mbuf for the header. */
10855         len = sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
10856         switch (dst->sa_family) {
10857 #ifdef INET
10858         case AF_INET:
10859                 len += sizeof(struct ip);
10860                 break;
10861 #endif
10862 #ifdef INET6
10863         case AF_INET6:
10864                 len += sizeof(struct ip6_hdr);
10865                 break;
10866 #endif
10867         default:
10868                 break;
10869         }
10870         if (port) {
10871                 len += sizeof(struct udphdr);
10872         }
10873         mout = sctp_get_mbuf_for_msg(len + max_linkhdr, 1, M_NOWAIT, 1, MT_DATA);
10874         if (mout == NULL) {
10875                 if (cause) {
10876                         sctp_m_freem(cause);
10877                 }
10878                 return;
10879         }
10880         SCTP_BUF_RESV_UF(mout, max_linkhdr);
10881         SCTP_BUF_LEN(mout) = len;
10882         SCTP_BUF_NEXT(mout) = cause;
10883         if (use_mflowid != 0) {
10884                 mout->m_pkthdr.flowid = mflowid;
10885                 mout->m_flags |= M_FLOWID;
10886         }
10887 #ifdef INET
10888         ip = NULL;
10889 #endif
10890 #ifdef INET6
10891         ip6 = NULL;
10892 #endif
10893         switch (dst->sa_family) {
10894 #ifdef INET
10895         case AF_INET:
10896                 src_sin = (struct sockaddr_in *)src;
10897                 dst_sin = (struct sockaddr_in *)dst;
10898                 ip = mtod(mout, struct ip *);
10899                 ip->ip_v = IPVERSION;
10900                 ip->ip_hl = (sizeof(struct ip) >> 2);
10901                 ip->ip_tos = 0;
10902                 ip->ip_id = ip_newid();
10903                 ip->ip_off = 0;
10904                 ip->ip_ttl = MODULE_GLOBAL(ip_defttl);
10905                 if (port) {
10906                         ip->ip_p = IPPROTO_UDP;
10907                 } else {
10908                         ip->ip_p = IPPROTO_SCTP;
10909                 }
10910                 ip->ip_src.s_addr = dst_sin->sin_addr.s_addr;
10911                 ip->ip_dst.s_addr = src_sin->sin_addr.s_addr;
10912                 ip->ip_sum = 0;
10913                 len = sizeof(struct ip);
10914                 shout = (struct sctphdr *)((caddr_t)ip + len);
10915                 break;
10916 #endif
10917 #ifdef INET6
10918         case AF_INET6:
10919                 src_sin6 = (struct sockaddr_in6 *)src;
10920                 dst_sin6 = (struct sockaddr_in6 *)dst;
10921                 ip6 = mtod(mout, struct ip6_hdr *);
10922                 ip6->ip6_flow = htonl(0x60000000);
10923                 if (V_ip6_auto_flowlabel) {
10924                         ip6->ip6_flow |= (htonl(ip6_randomflowlabel()) & IPV6_FLOWLABEL_MASK);
10925                 }
10926                 ip6->ip6_hlim = MODULE_GLOBAL(ip6_defhlim);
10927                 if (port) {
10928                         ip6->ip6_nxt = IPPROTO_UDP;
10929                 } else {
10930                         ip6->ip6_nxt = IPPROTO_SCTP;
10931                 }
10932                 ip6->ip6_src = dst_sin6->sin6_addr;
10933                 ip6->ip6_dst = src_sin6->sin6_addr;
10934                 len = sizeof(struct ip6_hdr);
10935                 shout = (struct sctphdr *)((caddr_t)ip6 + len);
10936                 break;
10937 #endif
10938         default:
10939                 len = 0;
10940                 shout = mtod(mout, struct sctphdr *);
10941                 break;
10942         }
10943         if (port) {
10944                 if (htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port)) == 0) {
10945                         sctp_m_freem(mout);
10946                         return;
10947                 }
10948                 udp = (struct udphdr *)shout;
10949                 udp->uh_sport = htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port));
10950                 udp->uh_dport = port;
10951                 udp->uh_sum = 0;
10952                 udp->uh_ulen = htons(sizeof(struct udphdr) +
10953                     sizeof(struct sctphdr) +
10954                     sizeof(struct sctp_chunkhdr) +
10955                     cause_len + padding_len);
10956                 len += sizeof(struct udphdr);
10957                 shout = (struct sctphdr *)((caddr_t)shout + sizeof(struct udphdr));
10958         } else {
10959                 udp = NULL;
10960         }
10961         shout->src_port = sh->dest_port;
10962         shout->dest_port = sh->src_port;
10963         shout->checksum = 0;
10964         if (vtag) {
10965                 shout->v_tag = htonl(vtag);
10966         } else {
10967                 shout->v_tag = sh->v_tag;
10968         }
10969         len += sizeof(struct sctphdr);
10970         ch = (struct sctp_chunkhdr *)((caddr_t)shout + sizeof(struct sctphdr));
10971         ch->chunk_type = type;
10972         if (vtag) {
10973                 ch->chunk_flags = 0;
10974         } else {
10975                 ch->chunk_flags = SCTP_HAD_NO_TCB;
10976         }
10977         ch->chunk_length = htons(sizeof(struct sctp_chunkhdr) + cause_len);
10978         len += sizeof(struct sctp_chunkhdr);
10979         len += cause_len + padding_len;
10980
10981         if (SCTP_GET_HEADER_FOR_OUTPUT(o_pak)) {
10982                 sctp_m_freem(mout);
10983                 return;
10984         }
10985         SCTP_ATTACH_CHAIN(o_pak, mout, len);
10986         switch (dst->sa_family) {
10987 #ifdef INET
10988         case AF_INET:
10989                 if (port) {
10990                         if (V_udp_cksum) {
10991                                 udp->uh_sum = in_pseudo(ip->ip_src.s_addr, ip->ip_dst.s_addr, udp->uh_ulen + htons(IPPROTO_UDP));
10992                         } else {
10993                                 udp->uh_sum = 0;
10994                         }
10995                 }
10996                 ip->ip_len = htons(len);
10997                 if (port) {
10998 #if defined(SCTP_WITH_NO_CSUM)
10999                         SCTP_STAT_INCR(sctps_sendnocrc);
11000 #else
11001                         shout->checksum = sctp_calculate_cksum(mout, sizeof(struct ip) + sizeof(struct udphdr));
11002                         SCTP_STAT_INCR(sctps_sendswcrc);
11003 #endif
11004                         if (V_udp_cksum) {
11005                                 SCTP_ENABLE_UDP_CSUM(o_pak);
11006                         }
11007                 } else {
11008 #if defined(SCTP_WITH_NO_CSUM)
11009                         SCTP_STAT_INCR(sctps_sendnocrc);
11010 #else
11011                         mout->m_pkthdr.csum_flags = CSUM_SCTP;
11012                         mout->m_pkthdr.csum_data = 0;
11013                         SCTP_STAT_INCR(sctps_sendhwcrc);
11014 #endif
11015                 }
11016 #ifdef SCTP_PACKET_LOGGING
11017                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING) {
11018                         sctp_packet_log(o_pak);
11019                 }
11020 #endif
11021                 SCTP_IP_OUTPUT(ret, o_pak, NULL, NULL, vrf_id);
11022                 break;
11023 #endif
11024 #ifdef INET6
11025         case AF_INET6:
11026                 ip6->ip6_plen = len - sizeof(struct ip6_hdr);
11027                 if (port) {
11028 #if defined(SCTP_WITH_NO_CSUM)
11029                         SCTP_STAT_INCR(sctps_sendnocrc);
11030 #else
11031                         shout->checksum = sctp_calculate_cksum(mout, sizeof(struct ip6_hdr) + sizeof(struct udphdr));
11032                         SCTP_STAT_INCR(sctps_sendswcrc);
11033 #endif
11034                         if ((udp->uh_sum = in6_cksum(o_pak, IPPROTO_UDP, sizeof(struct ip6_hdr), len - sizeof(struct ip6_hdr))) == 0) {
11035                                 udp->uh_sum = 0xffff;
11036                         }
11037                 } else {
11038 #if defined(SCTP_WITH_NO_CSUM)
11039                         SCTP_STAT_INCR(sctps_sendnocrc);
11040 #else
11041                         mout->m_pkthdr.csum_flags = CSUM_SCTP_IPV6;
11042                         mout->m_pkthdr.csum_data = 0;
11043                         SCTP_STAT_INCR(sctps_sendhwcrc);
11044 #endif
11045                 }
11046 #ifdef SCTP_PACKET_LOGGING
11047                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING) {
11048                         sctp_packet_log(o_pak);
11049                 }
11050 #endif
11051                 SCTP_IP6_OUTPUT(ret, o_pak, NULL, NULL, NULL, vrf_id);
11052                 break;
11053 #endif
11054         default:
11055                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Unknown protocol (TSNH) type %d\n",
11056                     dst->sa_family);
11057                 sctp_m_freem(mout);
11058                 SCTP_LTRACE_ERR_RET_PKT(mout, NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EFAULT);
11059                 return;
11060         }
11061         SCTP_STAT_INCR(sctps_sendpackets);
11062         SCTP_STAT_INCR_COUNTER64(sctps_outpackets);
11063         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
11064         return;
11065 }
11066
11067 void
11068 sctp_send_shutdown_complete2(struct sockaddr *src, struct sockaddr *dst,
11069     struct sctphdr *sh,
11070     uint8_t use_mflowid, uint32_t mflowid,
11071     uint32_t vrf_id, uint16_t port)
11072 {
11073         sctp_send_resp_msg(src, dst, sh, 0, SCTP_SHUTDOWN_COMPLETE, NULL,
11074             use_mflowid, mflowid,
11075             vrf_id, port);
11076 }
11077
11078 void
11079 sctp_send_hb(struct sctp_tcb *stcb, struct sctp_nets *net, int so_locked
11080 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
11081     SCTP_UNUSED
11082 #endif
11083 )
11084 {
11085         struct sctp_tmit_chunk *chk;
11086         struct sctp_heartbeat_chunk *hb;
11087         struct timeval now;
11088
11089         SCTP_TCB_LOCK_ASSERT(stcb);
11090         if (net == NULL) {
11091                 return;
11092         }
11093         (void)SCTP_GETTIME_TIMEVAL(&now);
11094         switch (net->ro._l_addr.sa.sa_family) {
11095 #ifdef INET
11096         case AF_INET:
11097                 break;
11098 #endif
11099 #ifdef INET6
11100         case AF_INET6:
11101                 break;
11102 #endif
11103         default:
11104                 return;
11105         }
11106         sctp_alloc_a_chunk(stcb, chk);
11107         if (chk == NULL) {
11108                 SCTPDBG(SCTP_DEBUG_OUTPUT4, "Gak, can't get a chunk for hb\n");
11109                 return;
11110         }
11111         chk->copy_by_ref = 0;
11112         chk->rec.chunk_id.id = SCTP_HEARTBEAT_REQUEST;
11113         chk->rec.chunk_id.can_take_data = 1;
11114         chk->asoc = &stcb->asoc;
11115         chk->send_size = sizeof(struct sctp_heartbeat_chunk);
11116
11117         chk->data = sctp_get_mbuf_for_msg(chk->send_size, 0, M_NOWAIT, 1, MT_HEADER);
11118         if (chk->data == NULL) {
11119                 sctp_free_a_chunk(stcb, chk, so_locked);
11120                 return;
11121         }
11122         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11123         SCTP_BUF_LEN(chk->data) = chk->send_size;
11124         chk->sent = SCTP_DATAGRAM_UNSENT;
11125         chk->snd_count = 0;
11126         chk->whoTo = net;
11127         atomic_add_int(&chk->whoTo->ref_count, 1);
11128         /* Now we have a mbuf that we can fill in with the details */
11129         hb = mtod(chk->data, struct sctp_heartbeat_chunk *);
11130         memset(hb, 0, sizeof(struct sctp_heartbeat_chunk));
11131         /* fill out chunk header */
11132         hb->ch.chunk_type = SCTP_HEARTBEAT_REQUEST;
11133         hb->ch.chunk_flags = 0;
11134         hb->ch.chunk_length = htons(chk->send_size);
11135         /* Fill out hb parameter */
11136         hb->heartbeat.hb_info.ph.param_type = htons(SCTP_HEARTBEAT_INFO);
11137         hb->heartbeat.hb_info.ph.param_length = htons(sizeof(struct sctp_heartbeat_info_param));
11138         hb->heartbeat.hb_info.time_value_1 = now.tv_sec;
11139         hb->heartbeat.hb_info.time_value_2 = now.tv_usec;
11140         /* Did our user request this one, put it in */
11141         hb->heartbeat.hb_info.addr_family = net->ro._l_addr.sa.sa_family;
11142         hb->heartbeat.hb_info.addr_len = net->ro._l_addr.sa.sa_len;
11143         if (net->dest_state & SCTP_ADDR_UNCONFIRMED) {
11144                 /*
11145                  * we only take from the entropy pool if the address is not
11146                  * confirmed.
11147                  */
11148                 net->heartbeat_random1 = hb->heartbeat.hb_info.random_value1 = sctp_select_initial_TSN(&stcb->sctp_ep->sctp_ep);
11149                 net->heartbeat_random2 = hb->heartbeat.hb_info.random_value2 = sctp_select_initial_TSN(&stcb->sctp_ep->sctp_ep);
11150         } else {
11151                 net->heartbeat_random1 = hb->heartbeat.hb_info.random_value1 = 0;
11152                 net->heartbeat_random2 = hb->heartbeat.hb_info.random_value2 = 0;
11153         }
11154         switch (net->ro._l_addr.sa.sa_family) {
11155 #ifdef INET
11156         case AF_INET:
11157                 memcpy(hb->heartbeat.hb_info.address,
11158                     &net->ro._l_addr.sin.sin_addr,
11159                     sizeof(net->ro._l_addr.sin.sin_addr));
11160                 break;
11161 #endif
11162 #ifdef INET6
11163         case AF_INET6:
11164                 memcpy(hb->heartbeat.hb_info.address,
11165                     &net->ro._l_addr.sin6.sin6_addr,
11166                     sizeof(net->ro._l_addr.sin6.sin6_addr));
11167                 break;
11168 #endif
11169         default:
11170                 return;
11171                 break;
11172         }
11173         net->hb_responded = 0;
11174         TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
11175         stcb->asoc.ctrl_queue_cnt++;
11176         SCTP_STAT_INCR(sctps_sendheartbeat);
11177         return;
11178 }
11179
11180 void
11181 sctp_send_ecn_echo(struct sctp_tcb *stcb, struct sctp_nets *net,
11182     uint32_t high_tsn)
11183 {
11184         struct sctp_association *asoc;
11185         struct sctp_ecne_chunk *ecne;
11186         struct sctp_tmit_chunk *chk;
11187
11188         if (net == NULL) {
11189                 return;
11190         }
11191         asoc = &stcb->asoc;
11192         SCTP_TCB_LOCK_ASSERT(stcb);
11193         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
11194                 if ((chk->rec.chunk_id.id == SCTP_ECN_ECHO) && (net == chk->whoTo)) {
11195                         /* found a previous ECN_ECHO update it if needed */
11196                         uint32_t cnt, ctsn;
11197
11198                         ecne = mtod(chk->data, struct sctp_ecne_chunk *);
11199                         ctsn = ntohl(ecne->tsn);
11200                         if (SCTP_TSN_GT(high_tsn, ctsn)) {
11201                                 ecne->tsn = htonl(high_tsn);
11202                                 SCTP_STAT_INCR(sctps_queue_upd_ecne);
11203                         }
11204                         cnt = ntohl(ecne->num_pkts_since_cwr);
11205                         cnt++;
11206                         ecne->num_pkts_since_cwr = htonl(cnt);
11207                         return;
11208                 }
11209         }
11210         /* nope could not find one to update so we must build one */
11211         sctp_alloc_a_chunk(stcb, chk);
11212         if (chk == NULL) {
11213                 return;
11214         }
11215         chk->copy_by_ref = 0;
11216         SCTP_STAT_INCR(sctps_queue_upd_ecne);
11217         chk->rec.chunk_id.id = SCTP_ECN_ECHO;
11218         chk->rec.chunk_id.can_take_data = 0;
11219         chk->asoc = &stcb->asoc;
11220         chk->send_size = sizeof(struct sctp_ecne_chunk);
11221         chk->data = sctp_get_mbuf_for_msg(chk->send_size, 0, M_NOWAIT, 1, MT_HEADER);
11222         if (chk->data == NULL) {
11223                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
11224                 return;
11225         }
11226         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11227         SCTP_BUF_LEN(chk->data) = chk->send_size;
11228         chk->sent = SCTP_DATAGRAM_UNSENT;
11229         chk->snd_count = 0;
11230         chk->whoTo = net;
11231         atomic_add_int(&chk->whoTo->ref_count, 1);
11232
11233         stcb->asoc.ecn_echo_cnt_onq++;
11234         ecne = mtod(chk->data, struct sctp_ecne_chunk *);
11235         ecne->ch.chunk_type = SCTP_ECN_ECHO;
11236         ecne->ch.chunk_flags = 0;
11237         ecne->ch.chunk_length = htons(sizeof(struct sctp_ecne_chunk));
11238         ecne->tsn = htonl(high_tsn);
11239         ecne->num_pkts_since_cwr = htonl(1);
11240         TAILQ_INSERT_HEAD(&stcb->asoc.control_send_queue, chk, sctp_next);
11241         asoc->ctrl_queue_cnt++;
11242 }
11243
11244 void
11245 sctp_send_packet_dropped(struct sctp_tcb *stcb, struct sctp_nets *net,
11246     struct mbuf *m, int len, int iphlen, int bad_crc)
11247 {
11248         struct sctp_association *asoc;
11249         struct sctp_pktdrop_chunk *drp;
11250         struct sctp_tmit_chunk *chk;
11251         uint8_t *datap;
11252         int was_trunc = 0;
11253         int fullsz = 0;
11254         long spc;
11255         int offset;
11256         struct sctp_chunkhdr *ch, chunk_buf;
11257         unsigned int chk_length;
11258
11259         if (!stcb) {
11260                 return;
11261         }
11262         asoc = &stcb->asoc;
11263         SCTP_TCB_LOCK_ASSERT(stcb);
11264         if (asoc->peer_supports_pktdrop == 0) {
11265                 /*-
11266                  * peer must declare support before I send one.
11267                  */
11268                 return;
11269         }
11270         if (stcb->sctp_socket == NULL) {
11271                 return;
11272         }
11273         sctp_alloc_a_chunk(stcb, chk);
11274         if (chk == NULL) {
11275                 return;
11276         }
11277         chk->copy_by_ref = 0;
11278         len -= iphlen;
11279         chk->send_size = len;
11280         /* Validate that we do not have an ABORT in here. */
11281         offset = iphlen + sizeof(struct sctphdr);
11282         ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, offset,
11283             sizeof(*ch), (uint8_t *) & chunk_buf);
11284         while (ch != NULL) {
11285                 chk_length = ntohs(ch->chunk_length);
11286                 if (chk_length < sizeof(*ch)) {
11287                         /* break to abort land */
11288                         break;
11289                 }
11290                 switch (ch->chunk_type) {
11291                 case SCTP_PACKET_DROPPED:
11292                 case SCTP_ABORT_ASSOCIATION:
11293                 case SCTP_INITIATION_ACK:
11294                         /**
11295                          * We don't respond with an PKT-DROP to an ABORT
11296                          * or PKT-DROP. We also do not respond to an
11297                          * INIT-ACK, because we can't know if the initiation
11298                          * tag is correct or not.
11299                          */
11300                         sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
11301                         return;
11302                 default:
11303                         break;
11304                 }
11305                 offset += SCTP_SIZE32(chk_length);
11306                 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, offset,
11307                     sizeof(*ch), (uint8_t *) & chunk_buf);
11308         }
11309
11310         if ((len + SCTP_MAX_OVERHEAD + sizeof(struct sctp_pktdrop_chunk)) >
11311             min(stcb->asoc.smallest_mtu, MCLBYTES)) {
11312                 /*
11313                  * only send 1 mtu worth, trim off the excess on the end.
11314                  */
11315                 fullsz = len;
11316                 len = min(stcb->asoc.smallest_mtu, MCLBYTES) - SCTP_MAX_OVERHEAD;
11317                 was_trunc = 1;
11318         }
11319         chk->asoc = &stcb->asoc;
11320         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
11321         if (chk->data == NULL) {
11322 jump_out:
11323                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
11324                 return;
11325         }
11326         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11327         drp = mtod(chk->data, struct sctp_pktdrop_chunk *);
11328         if (drp == NULL) {
11329                 sctp_m_freem(chk->data);
11330                 chk->data = NULL;
11331                 goto jump_out;
11332         }
11333         chk->book_size = SCTP_SIZE32((chk->send_size + sizeof(struct sctp_pktdrop_chunk) +
11334             sizeof(struct sctphdr) + SCTP_MED_OVERHEAD));
11335         chk->book_size_scale = 0;
11336         if (was_trunc) {
11337                 drp->ch.chunk_flags = SCTP_PACKET_TRUNCATED;
11338                 drp->trunc_len = htons(fullsz);
11339                 /*
11340                  * Len is already adjusted to size minus overhead above take
11341                  * out the pkt_drop chunk itself from it.
11342                  */
11343                 chk->send_size = len - sizeof(struct sctp_pktdrop_chunk);
11344                 len = chk->send_size;
11345         } else {
11346                 /* no truncation needed */
11347                 drp->ch.chunk_flags = 0;
11348                 drp->trunc_len = htons(0);
11349         }
11350         if (bad_crc) {
11351                 drp->ch.chunk_flags |= SCTP_BADCRC;
11352         }
11353         chk->send_size += sizeof(struct sctp_pktdrop_chunk);
11354         SCTP_BUF_LEN(chk->data) = chk->send_size;
11355         chk->sent = SCTP_DATAGRAM_UNSENT;
11356         chk->snd_count = 0;
11357         if (net) {
11358                 /* we should hit here */
11359                 chk->whoTo = net;
11360                 atomic_add_int(&chk->whoTo->ref_count, 1);
11361         } else {
11362                 chk->whoTo = NULL;
11363         }
11364         chk->rec.chunk_id.id = SCTP_PACKET_DROPPED;
11365         chk->rec.chunk_id.can_take_data = 1;
11366         drp->ch.chunk_type = SCTP_PACKET_DROPPED;
11367         drp->ch.chunk_length = htons(chk->send_size);
11368         spc = SCTP_SB_LIMIT_RCV(stcb->sctp_socket);
11369         if (spc < 0) {
11370                 spc = 0;
11371         }
11372         drp->bottle_bw = htonl(spc);
11373         if (asoc->my_rwnd) {
11374                 drp->current_onq = htonl(asoc->size_on_reasm_queue +
11375                     asoc->size_on_all_streams +
11376                     asoc->my_rwnd_control_len +
11377                     stcb->sctp_socket->so_rcv.sb_cc);
11378         } else {
11379                 /*-
11380                  * If my rwnd is 0, possibly from mbuf depletion as well as
11381                  * space used, tell the peer there is NO space aka onq == bw
11382                  */
11383                 drp->current_onq = htonl(spc);
11384         }
11385         drp->reserved = 0;
11386         datap = drp->data;
11387         m_copydata(m, iphlen, len, (caddr_t)datap);
11388         TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
11389         asoc->ctrl_queue_cnt++;
11390 }
11391
11392 void
11393 sctp_send_cwr(struct sctp_tcb *stcb, struct sctp_nets *net, uint32_t high_tsn, uint8_t override)
11394 {
11395         struct sctp_association *asoc;
11396         struct sctp_cwr_chunk *cwr;
11397         struct sctp_tmit_chunk *chk;
11398
11399         SCTP_TCB_LOCK_ASSERT(stcb);
11400         if (net == NULL) {
11401                 return;
11402         }
11403         asoc = &stcb->asoc;
11404         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
11405                 if ((chk->rec.chunk_id.id == SCTP_ECN_CWR) && (net == chk->whoTo)) {
11406                         /*
11407                          * found a previous CWR queued to same destination
11408                          * update it if needed
11409                          */
11410                         uint32_t ctsn;
11411
11412                         cwr = mtod(chk->data, struct sctp_cwr_chunk *);
11413                         ctsn = ntohl(cwr->tsn);
11414                         if (SCTP_TSN_GT(high_tsn, ctsn)) {
11415                                 cwr->tsn = htonl(high_tsn);
11416                         }
11417                         if (override & SCTP_CWR_REDUCE_OVERRIDE) {
11418                                 /* Make sure override is carried */
11419                                 cwr->ch.chunk_flags |= SCTP_CWR_REDUCE_OVERRIDE;
11420                         }
11421                         return;
11422                 }
11423         }
11424         sctp_alloc_a_chunk(stcb, chk);
11425         if (chk == NULL) {
11426                 return;
11427         }
11428         chk->copy_by_ref = 0;
11429         chk->rec.chunk_id.id = SCTP_ECN_CWR;
11430         chk->rec.chunk_id.can_take_data = 1;
11431         chk->asoc = &stcb->asoc;
11432         chk->send_size = sizeof(struct sctp_cwr_chunk);
11433         chk->data = sctp_get_mbuf_for_msg(chk->send_size, 0, M_NOWAIT, 1, MT_HEADER);
11434         if (chk->data == NULL) {
11435                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
11436                 return;
11437         }
11438         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11439         SCTP_BUF_LEN(chk->data) = chk->send_size;
11440         chk->sent = SCTP_DATAGRAM_UNSENT;
11441         chk->snd_count = 0;
11442         chk->whoTo = net;
11443         atomic_add_int(&chk->whoTo->ref_count, 1);
11444         cwr = mtod(chk->data, struct sctp_cwr_chunk *);
11445         cwr->ch.chunk_type = SCTP_ECN_CWR;
11446         cwr->ch.chunk_flags = override;
11447         cwr->ch.chunk_length = htons(sizeof(struct sctp_cwr_chunk));
11448         cwr->tsn = htonl(high_tsn);
11449         TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
11450         asoc->ctrl_queue_cnt++;
11451 }
11452
11453 void
11454 sctp_add_stream_reset_out(struct sctp_tmit_chunk *chk,
11455     int number_entries, uint16_t * list,
11456     uint32_t seq, uint32_t resp_seq, uint32_t last_sent)
11457 {
11458         uint16_t len, old_len, i;
11459         struct sctp_stream_reset_out_request *req_out;
11460         struct sctp_chunkhdr *ch;
11461
11462         ch = mtod(chk->data, struct sctp_chunkhdr *);
11463         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11464
11465         /* get to new offset for the param. */
11466         req_out = (struct sctp_stream_reset_out_request *)((caddr_t)ch + len);
11467         /* now how long will this param be? */
11468         len = (sizeof(struct sctp_stream_reset_out_request) + (sizeof(uint16_t) * number_entries));
11469         req_out->ph.param_type = htons(SCTP_STR_RESET_OUT_REQUEST);
11470         req_out->ph.param_length = htons(len);
11471         req_out->request_seq = htonl(seq);
11472         req_out->response_seq = htonl(resp_seq);
11473         req_out->send_reset_at_tsn = htonl(last_sent);
11474         if (number_entries) {
11475                 for (i = 0; i < number_entries; i++) {
11476                         req_out->list_of_streams[i] = htons(list[i]);
11477                 }
11478         }
11479         if (SCTP_SIZE32(len) > len) {
11480                 /*-
11481                  * Need to worry about the pad we may end up adding to the
11482                  * end. This is easy since the struct is either aligned to 4
11483                  * bytes or 2 bytes off.
11484                  */
11485                 req_out->list_of_streams[number_entries] = 0;
11486         }
11487         /* now fix the chunk length */
11488         ch->chunk_length = htons(len + old_len);
11489         chk->book_size = len + old_len;
11490         chk->book_size_scale = 0;
11491         chk->send_size = SCTP_SIZE32(chk->book_size);
11492         SCTP_BUF_LEN(chk->data) = chk->send_size;
11493         return;
11494 }
11495
11496 static void
11497 sctp_add_stream_reset_in(struct sctp_tmit_chunk *chk,
11498     int number_entries, uint16_t * list,
11499     uint32_t seq)
11500 {
11501         uint16_t len, old_len, i;
11502         struct sctp_stream_reset_in_request *req_in;
11503         struct sctp_chunkhdr *ch;
11504
11505         ch = mtod(chk->data, struct sctp_chunkhdr *);
11506         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11507
11508         /* get to new offset for the param. */
11509         req_in = (struct sctp_stream_reset_in_request *)((caddr_t)ch + len);
11510         /* now how long will this param be? */
11511         len = (sizeof(struct sctp_stream_reset_in_request) + (sizeof(uint16_t) * number_entries));
11512         req_in->ph.param_type = htons(SCTP_STR_RESET_IN_REQUEST);
11513         req_in->ph.param_length = htons(len);
11514         req_in->request_seq = htonl(seq);
11515         if (number_entries) {
11516                 for (i = 0; i < number_entries; i++) {
11517                         req_in->list_of_streams[i] = htons(list[i]);
11518                 }
11519         }
11520         if (SCTP_SIZE32(len) > len) {
11521                 /*-
11522                  * Need to worry about the pad we may end up adding to the
11523                  * end. This is easy since the struct is either aligned to 4
11524                  * bytes or 2 bytes off.
11525                  */
11526                 req_in->list_of_streams[number_entries] = 0;
11527         }
11528         /* now fix the chunk length */
11529         ch->chunk_length = htons(len + old_len);
11530         chk->book_size = len + old_len;
11531         chk->book_size_scale = 0;
11532         chk->send_size = SCTP_SIZE32(chk->book_size);
11533         SCTP_BUF_LEN(chk->data) = chk->send_size;
11534         return;
11535 }
11536
11537 static void
11538 sctp_add_stream_reset_tsn(struct sctp_tmit_chunk *chk,
11539     uint32_t seq)
11540 {
11541         uint16_t len, old_len;
11542         struct sctp_stream_reset_tsn_request *req_tsn;
11543         struct sctp_chunkhdr *ch;
11544
11545         ch = mtod(chk->data, struct sctp_chunkhdr *);
11546         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11547
11548         /* get to new offset for the param. */
11549         req_tsn = (struct sctp_stream_reset_tsn_request *)((caddr_t)ch + len);
11550         /* now how long will this param be? */
11551         len = sizeof(struct sctp_stream_reset_tsn_request);
11552         req_tsn->ph.param_type = htons(SCTP_STR_RESET_TSN_REQUEST);
11553         req_tsn->ph.param_length = htons(len);
11554         req_tsn->request_seq = htonl(seq);
11555
11556         /* now fix the chunk length */
11557         ch->chunk_length = htons(len + old_len);
11558         chk->send_size = len + old_len;
11559         chk->book_size = SCTP_SIZE32(chk->send_size);
11560         chk->book_size_scale = 0;
11561         SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size);
11562         return;
11563 }
11564
11565 void
11566 sctp_add_stream_reset_result(struct sctp_tmit_chunk *chk,
11567     uint32_t resp_seq, uint32_t result)
11568 {
11569         uint16_t len, old_len;
11570         struct sctp_stream_reset_response *resp;
11571         struct sctp_chunkhdr *ch;
11572
11573         ch = mtod(chk->data, struct sctp_chunkhdr *);
11574         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11575
11576         /* get to new offset for the param. */
11577         resp = (struct sctp_stream_reset_response *)((caddr_t)ch + len);
11578         /* now how long will this param be? */
11579         len = sizeof(struct sctp_stream_reset_response);
11580         resp->ph.param_type = htons(SCTP_STR_RESET_RESPONSE);
11581         resp->ph.param_length = htons(len);
11582         resp->response_seq = htonl(resp_seq);
11583         resp->result = ntohl(result);
11584
11585         /* now fix the chunk length */
11586         ch->chunk_length = htons(len + old_len);
11587         chk->book_size = len + old_len;
11588         chk->book_size_scale = 0;
11589         chk->send_size = SCTP_SIZE32(chk->book_size);
11590         SCTP_BUF_LEN(chk->data) = chk->send_size;
11591         return;
11592 }
11593
11594 void
11595 sctp_add_stream_reset_result_tsn(struct sctp_tmit_chunk *chk,
11596     uint32_t resp_seq, uint32_t result,
11597     uint32_t send_una, uint32_t recv_next)
11598 {
11599         uint16_t len, old_len;
11600         struct sctp_stream_reset_response_tsn *resp;
11601         struct sctp_chunkhdr *ch;
11602
11603         ch = mtod(chk->data, struct sctp_chunkhdr *);
11604         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11605
11606         /* get to new offset for the param. */
11607         resp = (struct sctp_stream_reset_response_tsn *)((caddr_t)ch + len);
11608         /* now how long will this param be? */
11609         len = sizeof(struct sctp_stream_reset_response_tsn);
11610         resp->ph.param_type = htons(SCTP_STR_RESET_RESPONSE);
11611         resp->ph.param_length = htons(len);
11612         resp->response_seq = htonl(resp_seq);
11613         resp->result = htonl(result);
11614         resp->senders_next_tsn = htonl(send_una);
11615         resp->receivers_next_tsn = htonl(recv_next);
11616
11617         /* now fix the chunk length */
11618         ch->chunk_length = htons(len + old_len);
11619         chk->book_size = len + old_len;
11620         chk->send_size = SCTP_SIZE32(chk->book_size);
11621         chk->book_size_scale = 0;
11622         SCTP_BUF_LEN(chk->data) = chk->send_size;
11623         return;
11624 }
11625
11626 static void
11627 sctp_add_an_out_stream(struct sctp_tmit_chunk *chk,
11628     uint32_t seq,
11629     uint16_t adding)
11630 {
11631         uint16_t len, old_len;
11632         struct sctp_chunkhdr *ch;
11633         struct sctp_stream_reset_add_strm *addstr;
11634
11635         ch = mtod(chk->data, struct sctp_chunkhdr *);
11636         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11637
11638         /* get to new offset for the param. */
11639         addstr = (struct sctp_stream_reset_add_strm *)((caddr_t)ch + len);
11640         /* now how long will this param be? */
11641         len = sizeof(struct sctp_stream_reset_add_strm);
11642
11643         /* Fill it out. */
11644         addstr->ph.param_type = htons(SCTP_STR_RESET_ADD_OUT_STREAMS);
11645         addstr->ph.param_length = htons(len);
11646         addstr->request_seq = htonl(seq);
11647         addstr->number_of_streams = htons(adding);
11648         addstr->reserved = 0;
11649
11650         /* now fix the chunk length */
11651         ch->chunk_length = htons(len + old_len);
11652         chk->send_size = len + old_len;
11653         chk->book_size = SCTP_SIZE32(chk->send_size);
11654         chk->book_size_scale = 0;
11655         SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size);
11656         return;
11657 }
11658
11659 static void
11660 sctp_add_an_in_stream(struct sctp_tmit_chunk *chk,
11661     uint32_t seq,
11662     uint16_t adding)
11663 {
11664         uint16_t len, old_len;
11665         struct sctp_chunkhdr *ch;
11666         struct sctp_stream_reset_add_strm *addstr;
11667
11668         ch = mtod(chk->data, struct sctp_chunkhdr *);
11669         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11670
11671         /* get to new offset for the param. */
11672         addstr = (struct sctp_stream_reset_add_strm *)((caddr_t)ch + len);
11673         /* now how long will this param be? */
11674         len = sizeof(struct sctp_stream_reset_add_strm);
11675         /* Fill it out. */
11676         addstr->ph.param_type = htons(SCTP_STR_RESET_ADD_IN_STREAMS);
11677         addstr->ph.param_length = htons(len);
11678         addstr->request_seq = htonl(seq);
11679         addstr->number_of_streams = htons(adding);
11680         addstr->reserved = 0;
11681
11682         /* now fix the chunk length */
11683         ch->chunk_length = htons(len + old_len);
11684         chk->send_size = len + old_len;
11685         chk->book_size = SCTP_SIZE32(chk->send_size);
11686         chk->book_size_scale = 0;
11687         SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size);
11688         return;
11689 }
11690
11691 int
11692 sctp_send_str_reset_req(struct sctp_tcb *stcb,
11693     int number_entries, uint16_t * list,
11694     uint8_t send_out_req,
11695     uint8_t send_in_req,
11696     uint8_t send_tsn_req,
11697     uint8_t add_stream,
11698     uint16_t adding_o,
11699     uint16_t adding_i, uint8_t peer_asked)
11700 {
11701
11702         struct sctp_association *asoc;
11703         struct sctp_tmit_chunk *chk;
11704         struct sctp_chunkhdr *ch;
11705         uint32_t seq;
11706
11707         asoc = &stcb->asoc;
11708         if (asoc->stream_reset_outstanding) {
11709                 /*-
11710                  * Already one pending, must get ACK back to clear the flag.
11711                  */
11712                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EBUSY);
11713                 return (EBUSY);
11714         }
11715         if ((send_out_req == 0) && (send_in_req == 0) && (send_tsn_req == 0) &&
11716             (add_stream == 0)) {
11717                 /* nothing to do */
11718                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
11719                 return (EINVAL);
11720         }
11721         if (send_tsn_req && (send_out_req || send_in_req)) {
11722                 /* error, can't do that */
11723                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
11724                 return (EINVAL);
11725         }
11726         sctp_alloc_a_chunk(stcb, chk);
11727         if (chk == NULL) {
11728                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
11729                 return (ENOMEM);
11730         }
11731         chk->copy_by_ref = 0;
11732         chk->rec.chunk_id.id = SCTP_STREAM_RESET;
11733         chk->rec.chunk_id.can_take_data = 0;
11734         chk->asoc = &stcb->asoc;
11735         chk->book_size = sizeof(struct sctp_chunkhdr);
11736         chk->send_size = SCTP_SIZE32(chk->book_size);
11737         chk->book_size_scale = 0;
11738
11739         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
11740         if (chk->data == NULL) {
11741                 sctp_free_a_chunk(stcb, chk, SCTP_SO_LOCKED);
11742                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
11743                 return (ENOMEM);
11744         }
11745         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11746
11747         /* setup chunk parameters */
11748         chk->sent = SCTP_DATAGRAM_UNSENT;
11749         chk->snd_count = 0;
11750         if (stcb->asoc.alternate) {
11751                 chk->whoTo = stcb->asoc.alternate;
11752         } else {
11753                 chk->whoTo = stcb->asoc.primary_destination;
11754         }
11755         atomic_add_int(&chk->whoTo->ref_count, 1);
11756         ch = mtod(chk->data, struct sctp_chunkhdr *);
11757         ch->chunk_type = SCTP_STREAM_RESET;
11758         ch->chunk_flags = 0;
11759         ch->chunk_length = htons(chk->book_size);
11760         SCTP_BUF_LEN(chk->data) = chk->send_size;
11761
11762         seq = stcb->asoc.str_reset_seq_out;
11763         if (send_out_req) {
11764                 sctp_add_stream_reset_out(chk, number_entries, list,
11765                     seq, (stcb->asoc.str_reset_seq_in - 1), (stcb->asoc.sending_seq - 1));
11766                 asoc->stream_reset_out_is_outstanding = 1;
11767                 seq++;
11768                 asoc->stream_reset_outstanding++;
11769         }
11770         if ((add_stream & 1) &&
11771             ((stcb->asoc.strm_realoutsize - stcb->asoc.streamoutcnt) < adding_o)) {
11772                 /* Need to allocate more */
11773                 struct sctp_stream_out *oldstream;
11774                 struct sctp_stream_queue_pending *sp, *nsp;
11775                 int i;
11776
11777                 oldstream = stcb->asoc.strmout;
11778                 /* get some more */
11779                 SCTP_MALLOC(stcb->asoc.strmout, struct sctp_stream_out *,
11780                     ((stcb->asoc.streamoutcnt + adding_o) * sizeof(struct sctp_stream_out)),
11781                     SCTP_M_STRMO);
11782                 if (stcb->asoc.strmout == NULL) {
11783                         uint8_t x;
11784
11785                         stcb->asoc.strmout = oldstream;
11786                         /* Turn off the bit */
11787                         x = add_stream & 0xfe;
11788                         add_stream = x;
11789                         goto skip_stuff;
11790                 }
11791                 /*
11792                  * Ok now we proceed with copying the old out stuff and
11793                  * initializing the new stuff.
11794                  */
11795                 SCTP_TCB_SEND_LOCK(stcb);
11796                 stcb->asoc.ss_functions.sctp_ss_clear(stcb, &stcb->asoc, 0, 1);
11797                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
11798                         TAILQ_INIT(&stcb->asoc.strmout[i].outqueue);
11799                         stcb->asoc.strmout[i].chunks_on_queues = oldstream[i].chunks_on_queues;
11800                         stcb->asoc.strmout[i].next_sequence_send = oldstream[i].next_sequence_send;
11801                         stcb->asoc.strmout[i].last_msg_incomplete = oldstream[i].last_msg_incomplete;
11802                         stcb->asoc.strmout[i].stream_no = i;
11803                         stcb->asoc.ss_functions.sctp_ss_init_stream(&stcb->asoc.strmout[i], &oldstream[i]);
11804                         /* now anything on those queues? */
11805                         TAILQ_FOREACH_SAFE(sp, &oldstream[i].outqueue, next, nsp) {
11806                                 TAILQ_REMOVE(&oldstream[i].outqueue, sp, next);
11807                                 TAILQ_INSERT_TAIL(&stcb->asoc.strmout[i].outqueue, sp, next);
11808                         }
11809                         /* Now move assoc pointers too */
11810                         if (stcb->asoc.last_out_stream == &oldstream[i]) {
11811                                 stcb->asoc.last_out_stream = &stcb->asoc.strmout[i];
11812                         }
11813                         if (stcb->asoc.locked_on_sending == &oldstream[i]) {
11814                                 stcb->asoc.locked_on_sending = &stcb->asoc.strmout[i];
11815                         }
11816                 }
11817                 /* now the new streams */
11818                 stcb->asoc.ss_functions.sctp_ss_init(stcb, &stcb->asoc, 1);
11819                 for (i = stcb->asoc.streamoutcnt; i < (stcb->asoc.streamoutcnt + adding_o); i++) {
11820                         TAILQ_INIT(&stcb->asoc.strmout[i].outqueue);
11821                         stcb->asoc.strmout[i].chunks_on_queues = 0;
11822                         stcb->asoc.strmout[i].next_sequence_send = 0x0;
11823                         stcb->asoc.strmout[i].stream_no = i;
11824                         stcb->asoc.strmout[i].last_msg_incomplete = 0;
11825                         stcb->asoc.ss_functions.sctp_ss_init_stream(&stcb->asoc.strmout[i], NULL);
11826                 }
11827                 stcb->asoc.strm_realoutsize = stcb->asoc.streamoutcnt + adding_o;
11828                 SCTP_FREE(oldstream, SCTP_M_STRMO);
11829                 SCTP_TCB_SEND_UNLOCK(stcb);
11830         }
11831 skip_stuff:
11832         if ((add_stream & 1) && (adding_o > 0)) {
11833                 asoc->strm_pending_add_size = adding_o;
11834                 asoc->peer_req_out = peer_asked;
11835                 sctp_add_an_out_stream(chk, seq, adding_o);
11836                 seq++;
11837                 asoc->stream_reset_outstanding++;
11838         }
11839         if ((add_stream & 2) && (adding_i > 0)) {
11840                 sctp_add_an_in_stream(chk, seq, adding_i);
11841                 seq++;
11842                 asoc->stream_reset_outstanding++;
11843         }
11844         if (send_in_req) {
11845                 sctp_add_stream_reset_in(chk, number_entries, list, seq);
11846                 seq++;
11847                 asoc->stream_reset_outstanding++;
11848         }
11849         if (send_tsn_req) {
11850                 sctp_add_stream_reset_tsn(chk, seq);
11851                 asoc->stream_reset_outstanding++;
11852         }
11853         asoc->str_reset = chk;
11854         /* insert the chunk for sending */
11855         TAILQ_INSERT_TAIL(&asoc->control_send_queue,
11856             chk,
11857             sctp_next);
11858         asoc->ctrl_queue_cnt++;
11859         sctp_timer_start(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb, chk->whoTo);
11860         return (0);
11861 }
11862
11863 void
11864 sctp_send_abort(struct mbuf *m, int iphlen, struct sockaddr *src, struct sockaddr *dst,
11865     struct sctphdr *sh, uint32_t vtag, struct mbuf *cause,
11866     uint8_t use_mflowid, uint32_t mflowid,
11867     uint32_t vrf_id, uint16_t port)
11868 {
11869         /* Don't respond to an ABORT with an ABORT. */
11870         if (sctp_is_there_an_abort_here(m, iphlen, &vtag)) {
11871                 if (cause)
11872                         sctp_m_freem(cause);
11873                 return;
11874         }
11875         sctp_send_resp_msg(src, dst, sh, vtag, SCTP_ABORT_ASSOCIATION, cause,
11876             use_mflowid, mflowid,
11877             vrf_id, port);
11878         return;
11879 }
11880
11881 void
11882 sctp_send_operr_to(struct sockaddr *src, struct sockaddr *dst,
11883     struct sctphdr *sh, uint32_t vtag, struct mbuf *cause,
11884     uint8_t use_mflowid, uint32_t mflowid,
11885     uint32_t vrf_id, uint16_t port)
11886 {
11887         sctp_send_resp_msg(src, dst, sh, vtag, SCTP_OPERATION_ERROR, cause,
11888             use_mflowid, mflowid,
11889             vrf_id, port);
11890         return;
11891 }
11892
11893 static struct mbuf *
11894 sctp_copy_resume(struct uio *uio,
11895     int max_send_len,
11896     int user_marks_eor,
11897     int *error,
11898     uint32_t * sndout,
11899     struct mbuf **new_tail)
11900 {
11901         struct mbuf *m;
11902
11903         m = m_uiotombuf(uio, M_WAITOK, max_send_len, 0,
11904             (M_PKTHDR | (user_marks_eor ? M_EOR : 0)));
11905         if (m == NULL) {
11906                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
11907                 *error = ENOMEM;
11908         } else {
11909                 *sndout = m_length(m, NULL);
11910                 *new_tail = m_last(m);
11911         }
11912         return (m);
11913 }
11914
11915 static int
11916 sctp_copy_one(struct sctp_stream_queue_pending *sp,
11917     struct uio *uio,
11918     int resv_upfront)
11919 {
11920         int left;
11921
11922         left = sp->length;
11923         sp->data = m_uiotombuf(uio, M_WAITOK, sp->length,
11924             resv_upfront, 0);
11925         if (sp->data == NULL) {
11926                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
11927                 return (ENOMEM);
11928         }
11929         sp->tail_mbuf = m_last(sp->data);
11930         return (0);
11931 }
11932
11933
11934
11935 static struct sctp_stream_queue_pending *
11936 sctp_copy_it_in(struct sctp_tcb *stcb,
11937     struct sctp_association *asoc,
11938     struct sctp_sndrcvinfo *srcv,
11939     struct uio *uio,
11940     struct sctp_nets *net,
11941     int max_send_len,
11942     int user_marks_eor,
11943     int *error)
11944 {
11945         /*-
11946          * This routine must be very careful in its work. Protocol
11947          * processing is up and running so care must be taken to spl...()
11948          * when you need to do something that may effect the stcb/asoc. The
11949          * sb is locked however. When data is copied the protocol processing
11950          * should be enabled since this is a slower operation...
11951          */
11952         struct sctp_stream_queue_pending *sp = NULL;
11953         int resv_in_first;
11954
11955         *error = 0;
11956         /* Now can we send this? */
11957         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_SENT) ||
11958             (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) ||
11959             (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED) ||
11960             (asoc->state & SCTP_STATE_SHUTDOWN_PENDING)) {
11961                 /* got data while shutting down */
11962                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
11963                 *error = ECONNRESET;
11964                 goto out_now;
11965         }
11966         sctp_alloc_a_strmoq(stcb, sp);
11967         if (sp == NULL) {
11968                 SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
11969                 *error = ENOMEM;
11970                 goto out_now;
11971         }
11972         sp->act_flags = 0;
11973         sp->sender_all_done = 0;
11974         sp->sinfo_flags = srcv->sinfo_flags;
11975         sp->timetolive = srcv->sinfo_timetolive;
11976         sp->ppid = srcv->sinfo_ppid;
11977         sp->context = srcv->sinfo_context;
11978         (void)SCTP_GETTIME_TIMEVAL(&sp->ts);
11979
11980         sp->stream = srcv->sinfo_stream;
11981         sp->length = min(uio->uio_resid, max_send_len);
11982         if ((sp->length == (uint32_t) uio->uio_resid) &&
11983             ((user_marks_eor == 0) ||
11984             (srcv->sinfo_flags & SCTP_EOF) ||
11985             (user_marks_eor && (srcv->sinfo_flags & SCTP_EOR)))) {
11986                 sp->msg_is_complete = 1;
11987         } else {
11988                 sp->msg_is_complete = 0;
11989         }
11990         sp->sender_all_done = 0;
11991         sp->some_taken = 0;
11992         sp->put_last_out = 0;
11993         resv_in_first = sizeof(struct sctp_data_chunk);
11994         sp->data = sp->tail_mbuf = NULL;
11995         if (sp->length == 0) {
11996                 *error = 0;
11997                 goto skip_copy;
11998         }
11999         if (srcv->sinfo_keynumber_valid) {
12000                 sp->auth_keyid = srcv->sinfo_keynumber;
12001         } else {
12002                 sp->auth_keyid = stcb->asoc.authinfo.active_keyid;
12003         }
12004         if (sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks)) {
12005                 sctp_auth_key_acquire(stcb, sp->auth_keyid);
12006                 sp->holds_key_ref = 1;
12007         }
12008         *error = sctp_copy_one(sp, uio, resv_in_first);
12009 skip_copy:
12010         if (*error) {
12011                 sctp_free_a_strmoq(stcb, sp, SCTP_SO_LOCKED);
12012                 sp = NULL;
12013         } else {
12014                 if (sp->sinfo_flags & SCTP_ADDR_OVER) {
12015                         sp->net = net;
12016                         atomic_add_int(&sp->net->ref_count, 1);
12017                 } else {
12018                         sp->net = NULL;
12019                 }
12020                 sctp_set_prsctp_policy(sp);
12021         }
12022 out_now:
12023         return (sp);
12024 }
12025
12026
12027 int
12028 sctp_sosend(struct socket *so,
12029     struct sockaddr *addr,
12030     struct uio *uio,
12031     struct mbuf *top,
12032     struct mbuf *control,
12033     int flags,
12034     struct thread *p
12035 )
12036 {
12037         int error, use_sndinfo = 0;
12038         struct sctp_sndrcvinfo sndrcvninfo;
12039         struct sockaddr *addr_to_use;
12040
12041 #if defined(INET) && defined(INET6)
12042         struct sockaddr_in sin;
12043
12044 #endif
12045
12046         if (control) {
12047                 /* process cmsg snd/rcv info (maybe a assoc-id) */
12048                 if (sctp_find_cmsg(SCTP_SNDRCV, (void *)&sndrcvninfo, control,
12049                     sizeof(sndrcvninfo))) {
12050                         /* got one */
12051                         use_sndinfo = 1;
12052                 }
12053         }
12054         addr_to_use = addr;
12055 #if defined(INET) && defined(INET6)
12056         if ((addr) && (addr->sa_family == AF_INET6)) {
12057                 struct sockaddr_in6 *sin6;
12058
12059                 sin6 = (struct sockaddr_in6 *)addr;
12060                 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
12061                         in6_sin6_2_sin(&sin, sin6);
12062                         addr_to_use = (struct sockaddr *)&sin;
12063                 }
12064         }
12065 #endif
12066         error = sctp_lower_sosend(so, addr_to_use, uio, top,
12067             control,
12068             flags,
12069             use_sndinfo ? &sndrcvninfo : NULL
12070             ,p
12071             );
12072         return (error);
12073 }
12074
12075
12076 int
12077 sctp_lower_sosend(struct socket *so,
12078     struct sockaddr *addr,
12079     struct uio *uio,
12080     struct mbuf *i_pak,
12081     struct mbuf *control,
12082     int flags,
12083     struct sctp_sndrcvinfo *srcv
12084     ,
12085     struct thread *p
12086 )
12087 {
12088         unsigned int sndlen = 0, max_len;
12089         int error, len;
12090         struct mbuf *top = NULL;
12091         int queue_only = 0, queue_only_for_init = 0;
12092         int free_cnt_applied = 0;
12093         int un_sent;
12094         int now_filled = 0;
12095         unsigned int inqueue_bytes = 0;
12096         struct sctp_block_entry be;
12097         struct sctp_inpcb *inp;
12098         struct sctp_tcb *stcb = NULL;
12099         struct timeval now;
12100         struct sctp_nets *net;
12101         struct sctp_association *asoc;
12102         struct sctp_inpcb *t_inp;
12103         int user_marks_eor;
12104         int create_lock_applied = 0;
12105         int nagle_applies = 0;
12106         int some_on_control = 0;
12107         int got_all_of_the_send = 0;
12108         int hold_tcblock = 0;
12109         int non_blocking = 0;
12110         uint32_t local_add_more, local_soresv = 0;
12111         uint16_t port;
12112         uint16_t sinfo_flags;
12113         sctp_assoc_t sinfo_assoc_id;
12114
12115         error = 0;
12116         net = NULL;
12117         stcb = NULL;
12118         asoc = NULL;
12119
12120         t_inp = inp = (struct sctp_inpcb *)so->so_pcb;
12121         if (inp == NULL) {
12122                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12123                 error = EINVAL;
12124                 if (i_pak) {
12125                         SCTP_RELEASE_PKT(i_pak);
12126                 }
12127                 return (error);
12128         }
12129         if ((uio == NULL) && (i_pak == NULL)) {
12130                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12131                 return (EINVAL);
12132         }
12133         user_marks_eor = sctp_is_feature_on(inp, SCTP_PCB_FLAGS_EXPLICIT_EOR);
12134         atomic_add_int(&inp->total_sends, 1);
12135         if (uio) {
12136                 if (uio->uio_resid < 0) {
12137                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12138                         return (EINVAL);
12139                 }
12140                 sndlen = uio->uio_resid;
12141         } else {
12142                 top = SCTP_HEADER_TO_CHAIN(i_pak);
12143                 sndlen = SCTP_HEADER_LEN(i_pak);
12144         }
12145         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Send called addr:%p send length %d\n",
12146             (void *)addr,
12147             sndlen);
12148         if ((inp->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) &&
12149             (inp->sctp_socket->so_qlimit)) {
12150                 /* The listener can NOT send */
12151                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOTCONN);
12152                 error = ENOTCONN;
12153                 goto out_unlocked;
12154         }
12155         /**
12156          * Pre-screen address, if one is given the sin-len
12157          * must be set correctly!
12158          */
12159         if (addr) {
12160                 union sctp_sockstore *raddr = (union sctp_sockstore *)addr;
12161
12162                 switch (raddr->sa.sa_family) {
12163 #ifdef INET
12164                 case AF_INET:
12165                         if (raddr->sin.sin_len != sizeof(struct sockaddr_in)) {
12166                                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12167                                 error = EINVAL;
12168                                 goto out_unlocked;
12169                         }
12170                         port = raddr->sin.sin_port;
12171                         break;
12172 #endif
12173 #ifdef INET6
12174                 case AF_INET6:
12175                         if (raddr->sin6.sin6_len != sizeof(struct sockaddr_in6)) {
12176                                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12177                                 error = EINVAL;
12178                                 goto out_unlocked;
12179                         }
12180                         port = raddr->sin6.sin6_port;
12181                         break;
12182 #endif
12183                 default:
12184                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EAFNOSUPPORT);
12185                         error = EAFNOSUPPORT;
12186                         goto out_unlocked;
12187                 }
12188         } else
12189                 port = 0;
12190
12191         if (srcv) {
12192                 sinfo_flags = srcv->sinfo_flags;
12193                 sinfo_assoc_id = srcv->sinfo_assoc_id;
12194                 if (INVALID_SINFO_FLAG(sinfo_flags) ||
12195                     PR_SCTP_INVALID_POLICY(sinfo_flags)) {
12196                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12197                         error = EINVAL;
12198                         goto out_unlocked;
12199                 }
12200                 if (srcv->sinfo_flags)
12201                         SCTP_STAT_INCR(sctps_sends_with_flags);
12202         } else {
12203                 sinfo_flags = inp->def_send.sinfo_flags;
12204                 sinfo_assoc_id = inp->def_send.sinfo_assoc_id;
12205         }
12206         if (sinfo_flags & SCTP_SENDALL) {
12207                 /* its a sendall */
12208                 error = sctp_sendall(inp, uio, top, srcv);
12209                 top = NULL;
12210                 goto out_unlocked;
12211         }
12212         if ((sinfo_flags & SCTP_ADDR_OVER) && (addr == NULL)) {
12213                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12214                 error = EINVAL;
12215                 goto out_unlocked;
12216         }
12217         /* now we must find the assoc */
12218         if ((inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) ||
12219             (inp->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) {
12220                 SCTP_INP_RLOCK(inp);
12221                 stcb = LIST_FIRST(&inp->sctp_asoc_list);
12222                 if (stcb) {
12223                         SCTP_TCB_LOCK(stcb);
12224                         hold_tcblock = 1;
12225                 }
12226                 SCTP_INP_RUNLOCK(inp);
12227         } else if (sinfo_assoc_id) {
12228                 stcb = sctp_findassociation_ep_asocid(inp, sinfo_assoc_id, 0);
12229         } else if (addr) {
12230                 /*-
12231                  * Since we did not use findep we must
12232                  * increment it, and if we don't find a tcb
12233                  * decrement it.
12234                  */
12235                 SCTP_INP_WLOCK(inp);
12236                 SCTP_INP_INCR_REF(inp);
12237                 SCTP_INP_WUNLOCK(inp);
12238                 stcb = sctp_findassociation_ep_addr(&t_inp, addr, &net, NULL, NULL);
12239                 if (stcb == NULL) {
12240                         SCTP_INP_WLOCK(inp);
12241                         SCTP_INP_DECR_REF(inp);
12242                         SCTP_INP_WUNLOCK(inp);
12243                 } else {
12244                         hold_tcblock = 1;
12245                 }
12246         }
12247         if ((stcb == NULL) && (addr)) {
12248                 /* Possible implicit send? */
12249                 SCTP_ASOC_CREATE_LOCK(inp);
12250                 create_lock_applied = 1;
12251                 if ((inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) ||
12252                     (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE)) {
12253                         /* Should I really unlock ? */
12254                         SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12255                         error = EINVAL;
12256                         goto out_unlocked;
12257
12258                 }
12259                 if (((inp->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) == 0) &&
12260                     (addr->sa_family == AF_INET6)) {
12261                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12262                         error = EINVAL;
12263                         goto out_unlocked;
12264                 }
12265                 SCTP_INP_WLOCK(inp);
12266                 SCTP_INP_INCR_REF(inp);
12267                 SCTP_INP_WUNLOCK(inp);
12268                 /* With the lock applied look again */
12269                 stcb = sctp_findassociation_ep_addr(&t_inp, addr, &net, NULL, NULL);
12270                 if ((stcb == NULL) && (control != NULL) && (port > 0)) {
12271                         stcb = sctp_findassociation_cmsgs(&t_inp, port, control, &net, &error);
12272                 }
12273                 if (stcb == NULL) {
12274                         SCTP_INP_WLOCK(inp);
12275                         SCTP_INP_DECR_REF(inp);
12276                         SCTP_INP_WUNLOCK(inp);
12277                 } else {
12278                         hold_tcblock = 1;
12279                 }
12280                 if (error) {
12281                         goto out_unlocked;
12282                 }
12283                 if (t_inp != inp) {
12284                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOTCONN);
12285                         error = ENOTCONN;
12286                         goto out_unlocked;
12287                 }
12288         }
12289         if (stcb == NULL) {
12290                 if (addr == NULL) {
12291                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOENT);
12292                         error = ENOENT;
12293                         goto out_unlocked;
12294                 } else {
12295                         /* We must go ahead and start the INIT process */
12296                         uint32_t vrf_id;
12297
12298                         if ((sinfo_flags & SCTP_ABORT) ||
12299                             ((sinfo_flags & SCTP_EOF) && (sndlen == 0))) {
12300                                 /*-
12301                                  * User asks to abort a non-existant assoc,
12302                                  * or EOF a non-existant assoc with no data
12303                                  */
12304                                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOENT);
12305                                 error = ENOENT;
12306                                 goto out_unlocked;
12307                         }
12308                         /* get an asoc/stcb struct */
12309                         vrf_id = inp->def_vrf_id;
12310 #ifdef INVARIANTS
12311                         if (create_lock_applied == 0) {
12312                                 panic("Error, should hold create lock and I don't?");
12313                         }
12314 #endif
12315                         stcb = sctp_aloc_assoc(inp, addr, &error, 0, vrf_id,
12316                             p
12317                             );
12318                         if (stcb == NULL) {
12319                                 /* Error is setup for us in the call */
12320                                 goto out_unlocked;
12321                         }
12322                         if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) {
12323                                 stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED;
12324                                 /*
12325                                  * Set the connected flag so we can queue
12326                                  * data
12327                                  */
12328                                 soisconnecting(so);
12329                         }
12330                         hold_tcblock = 1;
12331                         if (create_lock_applied) {
12332                                 SCTP_ASOC_CREATE_UNLOCK(inp);
12333                                 create_lock_applied = 0;
12334                         } else {
12335                                 SCTP_PRINTF("Huh-3? create lock should have been on??\n");
12336                         }
12337                         /*
12338                          * Turn on queue only flag to prevent data from
12339                          * being sent
12340                          */
12341                         queue_only = 1;
12342                         asoc = &stcb->asoc;
12343                         SCTP_SET_STATE(asoc, SCTP_STATE_COOKIE_WAIT);
12344                         (void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered);
12345
12346                         /* initialize authentication params for the assoc */
12347                         sctp_initialize_auth_params(inp, stcb);
12348
12349                         if (control) {
12350                                 if (sctp_process_cmsgs_for_init(stcb, control, &error)) {
12351                                         sctp_free_assoc(inp, stcb, SCTP_PCBFREE_FORCE, SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_7);
12352                                         hold_tcblock = 0;
12353                                         stcb = NULL;
12354                                         goto out_unlocked;
12355                                 }
12356                         }
12357                         /* out with the INIT */
12358                         queue_only_for_init = 1;
12359                         /*-
12360                          * we may want to dig in after this call and adjust the MTU
12361                          * value. It defaulted to 1500 (constant) but the ro
12362                          * structure may now have an update and thus we may need to
12363                          * change it BEFORE we append the message.
12364                          */
12365                 }
12366         } else
12367                 asoc = &stcb->asoc;
12368         if (srcv == NULL)
12369                 srcv = (struct sctp_sndrcvinfo *)&asoc->def_send;
12370         if (srcv->sinfo_flags & SCTP_ADDR_OVER) {
12371                 if (addr)
12372                         net = sctp_findnet(stcb, addr);
12373                 else
12374                         net = NULL;
12375                 if ((net == NULL) ||
12376                     ((port != 0) && (port != stcb->rport))) {
12377                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12378                         error = EINVAL;
12379                         goto out_unlocked;
12380                 }
12381         } else {
12382                 if (stcb->asoc.alternate) {
12383                         net = stcb->asoc.alternate;
12384                 } else {
12385                         net = stcb->asoc.primary_destination;
12386                 }
12387         }
12388         atomic_add_int(&stcb->total_sends, 1);
12389         /* Keep the stcb from being freed under our feet */
12390         atomic_add_int(&asoc->refcnt, 1);
12391         free_cnt_applied = 1;
12392
12393         if (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_NO_FRAGMENT)) {
12394                 if (sndlen > asoc->smallest_mtu) {
12395                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EMSGSIZE);
12396                         error = EMSGSIZE;
12397                         goto out_unlocked;
12398                 }
12399         }
12400         if (SCTP_SO_IS_NBIO(so)
12401             || (flags & MSG_NBIO)
12402             ) {
12403                 non_blocking = 1;
12404         }
12405         /* would we block? */
12406         if (non_blocking) {
12407                 if (hold_tcblock == 0) {
12408                         SCTP_TCB_LOCK(stcb);
12409                         hold_tcblock = 1;
12410                 }
12411                 inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
12412                 if ((SCTP_SB_LIMIT_SND(so) < (sndlen + inqueue_bytes + stcb->asoc.sb_send_resv)) ||
12413                     (stcb->asoc.chunks_on_out_queue >= SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue))) {
12414                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EWOULDBLOCK);
12415                         if (sndlen > SCTP_SB_LIMIT_SND(so))
12416                                 error = EMSGSIZE;
12417                         else
12418                                 error = EWOULDBLOCK;
12419                         goto out_unlocked;
12420                 }
12421                 stcb->asoc.sb_send_resv += sndlen;
12422                 SCTP_TCB_UNLOCK(stcb);
12423                 hold_tcblock = 0;
12424         } else {
12425                 atomic_add_int(&stcb->asoc.sb_send_resv, sndlen);
12426         }
12427         local_soresv = sndlen;
12428         if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
12429                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
12430                 error = ECONNRESET;
12431                 goto out_unlocked;
12432         }
12433         if (create_lock_applied) {
12434                 SCTP_ASOC_CREATE_UNLOCK(inp);
12435                 create_lock_applied = 0;
12436         }
12437         if (asoc->stream_reset_outstanding) {
12438                 /*
12439                  * Can't queue any data while stream reset is underway.
12440                  */
12441                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EAGAIN);
12442                 error = EAGAIN;
12443                 goto out_unlocked;
12444         }
12445         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) ||
12446             (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)) {
12447                 queue_only = 1;
12448         }
12449         /* we are now done with all control */
12450         if (control) {
12451                 sctp_m_freem(control);
12452                 control = NULL;
12453         }
12454         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_SENT) ||
12455             (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED) ||
12456             (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) ||
12457             (asoc->state & SCTP_STATE_SHUTDOWN_PENDING)) {
12458                 if (srcv->sinfo_flags & SCTP_ABORT) {
12459                         ;
12460                 } else {
12461                         SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
12462                         error = ECONNRESET;
12463                         goto out_unlocked;
12464                 }
12465         }
12466         /* Ok, we will attempt a msgsnd :> */
12467         if (p) {
12468                 p->td_ru.ru_msgsnd++;
12469         }
12470         /* Are we aborting? */
12471         if (srcv->sinfo_flags & SCTP_ABORT) {
12472                 struct mbuf *mm;
12473                 int tot_demand, tot_out = 0, max_out;
12474
12475                 SCTP_STAT_INCR(sctps_sends_with_abort);
12476                 if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) ||
12477                     (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)) {
12478                         /* It has to be up before we abort */
12479                         /* how big is the user initiated abort? */
12480                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12481                         error = EINVAL;
12482                         goto out;
12483                 }
12484                 if (hold_tcblock) {
12485                         SCTP_TCB_UNLOCK(stcb);
12486                         hold_tcblock = 0;
12487                 }
12488                 if (top) {
12489                         struct mbuf *cntm = NULL;
12490
12491                         mm = sctp_get_mbuf_for_msg(sizeof(struct sctp_paramhdr), 0, M_WAITOK, 1, MT_DATA);
12492                         if (sndlen != 0) {
12493                                 for (cntm = top; cntm; cntm = SCTP_BUF_NEXT(cntm)) {
12494                                         tot_out += SCTP_BUF_LEN(cntm);
12495                                 }
12496                         }
12497                 } else {
12498                         /* Must fit in a MTU */
12499                         tot_out = sndlen;
12500                         tot_demand = (tot_out + sizeof(struct sctp_paramhdr));
12501                         if (tot_demand > SCTP_DEFAULT_ADD_MORE) {
12502                                 /* To big */
12503                                 SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EMSGSIZE);
12504                                 error = EMSGSIZE;
12505                                 goto out;
12506                         }
12507                         mm = sctp_get_mbuf_for_msg(tot_demand, 0, M_WAITOK, 1, MT_DATA);
12508                 }
12509                 if (mm == NULL) {
12510                         SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12511                         error = ENOMEM;
12512                         goto out;
12513                 }
12514                 max_out = asoc->smallest_mtu - sizeof(struct sctp_paramhdr);
12515                 max_out -= sizeof(struct sctp_abort_msg);
12516                 if (tot_out > max_out) {
12517                         tot_out = max_out;
12518                 }
12519                 if (mm) {
12520                         struct sctp_paramhdr *ph;
12521
12522                         /* now move forward the data pointer */
12523                         ph = mtod(mm, struct sctp_paramhdr *);
12524                         ph->param_type = htons(SCTP_CAUSE_USER_INITIATED_ABT);
12525                         ph->param_length = htons(sizeof(struct sctp_paramhdr) + tot_out);
12526                         ph++;
12527                         SCTP_BUF_LEN(mm) = tot_out + sizeof(struct sctp_paramhdr);
12528                         if (top == NULL) {
12529                                 error = uiomove((caddr_t)ph, (int)tot_out, uio);
12530                                 if (error) {
12531                                         /*-
12532                                          * Here if we can't get his data we
12533                                          * still abort we just don't get to
12534                                          * send the users note :-0
12535                                          */
12536                                         sctp_m_freem(mm);
12537                                         mm = NULL;
12538                                 }
12539                         } else {
12540                                 if (sndlen != 0) {
12541                                         SCTP_BUF_NEXT(mm) = top;
12542                                 }
12543                         }
12544                 }
12545                 if (hold_tcblock == 0) {
12546                         SCTP_TCB_LOCK(stcb);
12547                 }
12548                 atomic_add_int(&stcb->asoc.refcnt, -1);
12549                 free_cnt_applied = 0;
12550                 /* release this lock, otherwise we hang on ourselves */
12551                 sctp_abort_an_association(stcb->sctp_ep, stcb, mm, SCTP_SO_LOCKED);
12552                 /* now relock the stcb so everything is sane */
12553                 hold_tcblock = 0;
12554                 stcb = NULL;
12555                 /*
12556                  * In this case top is already chained to mm avoid double
12557                  * free, since we free it below if top != NULL and driver
12558                  * would free it after sending the packet out
12559                  */
12560                 if (sndlen != 0) {
12561                         top = NULL;
12562                 }
12563                 goto out_unlocked;
12564         }
12565         /* Calculate the maximum we can send */
12566         inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
12567         if (SCTP_SB_LIMIT_SND(so) > inqueue_bytes) {
12568                 if (non_blocking) {
12569                         /* we already checked for non-blocking above. */
12570                         max_len = sndlen;
12571                 } else {
12572                         max_len = SCTP_SB_LIMIT_SND(so) - inqueue_bytes;
12573                 }
12574         } else {
12575                 max_len = 0;
12576         }
12577         if (hold_tcblock) {
12578                 SCTP_TCB_UNLOCK(stcb);
12579                 hold_tcblock = 0;
12580         }
12581         /* Is the stream no. valid? */
12582         if (srcv->sinfo_stream >= asoc->streamoutcnt) {
12583                 /* Invalid stream number */
12584                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12585                 error = EINVAL;
12586                 goto out_unlocked;
12587         }
12588         if (asoc->strmout == NULL) {
12589                 /* huh? software error */
12590                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EFAULT);
12591                 error = EFAULT;
12592                 goto out_unlocked;
12593         }
12594         /* Unless E_EOR mode is on, we must make a send FIT in one call. */
12595         if ((user_marks_eor == 0) &&
12596             (sndlen > SCTP_SB_LIMIT_SND(stcb->sctp_socket))) {
12597                 /* It will NEVER fit */
12598                 SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EMSGSIZE);
12599                 error = EMSGSIZE;
12600                 goto out_unlocked;
12601         }
12602         if ((uio == NULL) && user_marks_eor) {
12603                 /*-
12604                  * We do not support eeor mode for
12605                  * sending with mbuf chains (like sendfile).
12606                  */
12607                 SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12608                 error = EINVAL;
12609                 goto out_unlocked;
12610         }
12611         if (user_marks_eor) {
12612                 local_add_more = min(SCTP_SB_LIMIT_SND(so), SCTP_BASE_SYSCTL(sctp_add_more_threshold));
12613         } else {
12614                 /*-
12615                  * For non-eeor the whole message must fit in
12616                  * the socket send buffer.
12617                  */
12618                 local_add_more = sndlen;
12619         }
12620         len = 0;
12621         if (non_blocking) {
12622                 goto skip_preblock;
12623         }
12624         if (((max_len <= local_add_more) &&
12625             (SCTP_SB_LIMIT_SND(so) >= local_add_more)) ||
12626             (max_len == 0) ||
12627             ((stcb->asoc.chunks_on_out_queue + stcb->asoc.stream_queue_cnt) >= SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue))) {
12628                 /* No room right now ! */
12629                 SOCKBUF_LOCK(&so->so_snd);
12630                 inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
12631                 while ((SCTP_SB_LIMIT_SND(so) < (inqueue_bytes + local_add_more)) ||
12632                     ((stcb->asoc.stream_queue_cnt + stcb->asoc.chunks_on_out_queue) >= SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue))) {
12633                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "pre_block limit:%u <(inq:%d + %d) || (%d+%d > %d)\n",
12634                             (unsigned int)SCTP_SB_LIMIT_SND(so),
12635                             inqueue_bytes,
12636                             local_add_more,
12637                             stcb->asoc.stream_queue_cnt,
12638                             stcb->asoc.chunks_on_out_queue,
12639                             SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue));
12640                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
12641                                 sctp_log_block(SCTP_BLOCK_LOG_INTO_BLKA, asoc, sndlen);
12642                         }
12643                         be.error = 0;
12644                         stcb->block_entry = &be;
12645                         error = sbwait(&so->so_snd);
12646                         stcb->block_entry = NULL;
12647                         if (error || so->so_error || be.error) {
12648                                 if (error == 0) {
12649                                         if (so->so_error)
12650                                                 error = so->so_error;
12651                                         if (be.error) {
12652                                                 error = be.error;
12653                                         }
12654                                 }
12655                                 SOCKBUF_UNLOCK(&so->so_snd);
12656                                 goto out_unlocked;
12657                         }
12658                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
12659                                 sctp_log_block(SCTP_BLOCK_LOG_OUTOF_BLK,
12660                                     asoc, stcb->asoc.total_output_queue_size);
12661                         }
12662                         if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
12663                                 goto out_unlocked;
12664                         }
12665                         inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
12666                 }
12667                 if (SCTP_SB_LIMIT_SND(so) > inqueue_bytes) {
12668                         max_len = SCTP_SB_LIMIT_SND(so) - inqueue_bytes;
12669                 } else {
12670                         max_len = 0;
12671                 }
12672                 SOCKBUF_UNLOCK(&so->so_snd);
12673         }
12674 skip_preblock:
12675         if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
12676                 goto out_unlocked;
12677         }
12678         /*
12679          * sndlen covers for mbuf case uio_resid covers for the non-mbuf
12680          * case NOTE: uio will be null when top/mbuf is passed
12681          */
12682         if (sndlen == 0) {
12683                 if (srcv->sinfo_flags & SCTP_EOF) {
12684                         got_all_of_the_send = 1;
12685                         goto dataless_eof;
12686                 } else {
12687                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12688                         error = EINVAL;
12689                         goto out;
12690                 }
12691         }
12692         if (top == NULL) {
12693                 struct sctp_stream_queue_pending *sp;
12694                 struct sctp_stream_out *strm;
12695                 uint32_t sndout;
12696
12697                 SCTP_TCB_SEND_LOCK(stcb);
12698                 if ((asoc->stream_locked) &&
12699                     (asoc->stream_locked_on != srcv->sinfo_stream)) {
12700                         SCTP_TCB_SEND_UNLOCK(stcb);
12701                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12702                         error = EINVAL;
12703                         goto out;
12704                 }
12705                 SCTP_TCB_SEND_UNLOCK(stcb);
12706
12707                 strm = &stcb->asoc.strmout[srcv->sinfo_stream];
12708                 if (strm->last_msg_incomplete == 0) {
12709         do_a_copy_in:
12710                         sp = sctp_copy_it_in(stcb, asoc, srcv, uio, net, max_len, user_marks_eor, &error);
12711                         if ((sp == NULL) || (error)) {
12712                                 goto out;
12713                         }
12714                         SCTP_TCB_SEND_LOCK(stcb);
12715                         if (sp->msg_is_complete) {
12716                                 strm->last_msg_incomplete = 0;
12717                                 asoc->stream_locked = 0;
12718                         } else {
12719                                 /*
12720                                  * Just got locked to this guy in case of an
12721                                  * interrupt.
12722                                  */
12723                                 strm->last_msg_incomplete = 1;
12724                                 asoc->stream_locked = 1;
12725                                 asoc->stream_locked_on = srcv->sinfo_stream;
12726                                 sp->sender_all_done = 0;
12727                         }
12728                         sctp_snd_sb_alloc(stcb, sp->length);
12729                         atomic_add_int(&asoc->stream_queue_cnt, 1);
12730                         if (srcv->sinfo_flags & SCTP_UNORDERED) {
12731                                 SCTP_STAT_INCR(sctps_sends_with_unord);
12732                         }
12733                         TAILQ_INSERT_TAIL(&strm->outqueue, sp, next);
12734                         stcb->asoc.ss_functions.sctp_ss_add_to_stream(stcb, asoc, strm, sp, 1);
12735                         SCTP_TCB_SEND_UNLOCK(stcb);
12736                 } else {
12737                         SCTP_TCB_SEND_LOCK(stcb);
12738                         sp = TAILQ_LAST(&strm->outqueue, sctp_streamhead);
12739                         SCTP_TCB_SEND_UNLOCK(stcb);
12740                         if (sp == NULL) {
12741                                 /* ???? Huh ??? last msg is gone */
12742 #ifdef INVARIANTS
12743                                 panic("Warning: Last msg marked incomplete, yet nothing left?");
12744 #else
12745                                 SCTP_PRINTF("Warning: Last msg marked incomplete, yet nothing left?\n");
12746                                 strm->last_msg_incomplete = 0;
12747 #endif
12748                                 goto do_a_copy_in;
12749
12750                         }
12751                 }
12752                 while (uio->uio_resid > 0) {
12753                         /* How much room do we have? */
12754                         struct mbuf *new_tail, *mm;
12755
12756                         if (SCTP_SB_LIMIT_SND(so) > stcb->asoc.total_output_queue_size)
12757                                 max_len = SCTP_SB_LIMIT_SND(so) - stcb->asoc.total_output_queue_size;
12758                         else
12759                                 max_len = 0;
12760
12761                         if ((max_len > SCTP_BASE_SYSCTL(sctp_add_more_threshold)) ||
12762                             (max_len && (SCTP_SB_LIMIT_SND(so) < SCTP_BASE_SYSCTL(sctp_add_more_threshold))) ||
12763                             (uio->uio_resid && (uio->uio_resid <= (int)max_len))) {
12764                                 sndout = 0;
12765                                 new_tail = NULL;
12766                                 if (hold_tcblock) {
12767                                         SCTP_TCB_UNLOCK(stcb);
12768                                         hold_tcblock = 0;
12769                                 }
12770                                 mm = sctp_copy_resume(uio, max_len, user_marks_eor, &error, &sndout, &new_tail);
12771                                 if ((mm == NULL) || error) {
12772                                         if (mm) {
12773                                                 sctp_m_freem(mm);
12774                                         }
12775                                         goto out;
12776                                 }
12777                                 /* Update the mbuf and count */
12778                                 SCTP_TCB_SEND_LOCK(stcb);
12779                                 if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
12780                                         /*
12781                                          * we need to get out. Peer probably
12782                                          * aborted.
12783                                          */
12784                                         sctp_m_freem(mm);
12785                                         if (stcb->asoc.state & SCTP_PCB_FLAGS_WAS_ABORTED) {
12786                                                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
12787                                                 error = ECONNRESET;
12788                                         }
12789                                         SCTP_TCB_SEND_UNLOCK(stcb);
12790                                         goto out;
12791                                 }
12792                                 if (sp->tail_mbuf) {
12793                                         /* tack it to the end */
12794                                         SCTP_BUF_NEXT(sp->tail_mbuf) = mm;
12795                                         sp->tail_mbuf = new_tail;
12796                                 } else {
12797                                         /* A stolen mbuf */
12798                                         sp->data = mm;
12799                                         sp->tail_mbuf = new_tail;
12800                                 }
12801                                 sctp_snd_sb_alloc(stcb, sndout);
12802                                 atomic_add_int(&sp->length, sndout);
12803                                 len += sndout;
12804
12805                                 /* Did we reach EOR? */
12806                                 if ((uio->uio_resid == 0) &&
12807                                     ((user_marks_eor == 0) ||
12808                                     (srcv->sinfo_flags & SCTP_EOF) ||
12809                                     (user_marks_eor && (srcv->sinfo_flags & SCTP_EOR)))) {
12810                                         sp->msg_is_complete = 1;
12811                                 } else {
12812                                         sp->msg_is_complete = 0;
12813                                 }
12814                                 SCTP_TCB_SEND_UNLOCK(stcb);
12815                         }
12816                         if (uio->uio_resid == 0) {
12817                                 /* got it all? */
12818                                 continue;
12819                         }
12820                         /* PR-SCTP? */
12821                         if ((asoc->peer_supports_prsctp) && (asoc->sent_queue_cnt_removeable > 0)) {
12822                                 /*
12823                                  * This is ugly but we must assure locking
12824                                  * order
12825                                  */
12826                                 if (hold_tcblock == 0) {
12827                                         SCTP_TCB_LOCK(stcb);
12828                                         hold_tcblock = 1;
12829                                 }
12830                                 sctp_prune_prsctp(stcb, asoc, srcv, sndlen);
12831                                 inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
12832                                 if (SCTP_SB_LIMIT_SND(so) > stcb->asoc.total_output_queue_size)
12833                                         max_len = SCTP_SB_LIMIT_SND(so) - inqueue_bytes;
12834                                 else
12835                                         max_len = 0;
12836                                 if (max_len > 0) {
12837                                         continue;
12838                                 }
12839                                 SCTP_TCB_UNLOCK(stcb);
12840                                 hold_tcblock = 0;
12841                         }
12842                         /* wait for space now */
12843                         if (non_blocking) {
12844                                 /* Non-blocking io in place out */
12845                                 goto skip_out_eof;
12846                         }
12847                         /* What about the INIT, send it maybe */
12848                         if (queue_only_for_init) {
12849                                 if (hold_tcblock == 0) {
12850                                         SCTP_TCB_LOCK(stcb);
12851                                         hold_tcblock = 1;
12852                                 }
12853                                 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_OPEN) {
12854                                         /* a collision took us forward? */
12855                                         queue_only = 0;
12856                                 } else {
12857                                         sctp_send_initiate(inp, stcb, SCTP_SO_LOCKED);
12858                                         SCTP_SET_STATE(asoc, SCTP_STATE_COOKIE_WAIT);
12859                                         queue_only = 1;
12860                                 }
12861                         }
12862                         if ((net->flight_size > net->cwnd) &&
12863                             (asoc->sctp_cmt_on_off == 0)) {
12864                                 SCTP_STAT_INCR(sctps_send_cwnd_avoid);
12865                                 queue_only = 1;
12866                         } else if (asoc->ifp_had_enobuf) {
12867                                 SCTP_STAT_INCR(sctps_ifnomemqueued);
12868                                 if (net->flight_size > (2 * net->mtu)) {
12869                                         queue_only = 1;
12870                                 }
12871                                 asoc->ifp_had_enobuf = 0;
12872                         }
12873                         un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
12874                             (stcb->asoc.stream_queue_cnt * sizeof(struct sctp_data_chunk)));
12875                         if ((sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY)) &&
12876                             (stcb->asoc.total_flight > 0) &&
12877                             (stcb->asoc.stream_queue_cnt < SCTP_MAX_DATA_BUNDLING) &&
12878                             (un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD))) {
12879
12880                                 /*-
12881                                  * Ok, Nagle is set on and we have data outstanding.
12882                                  * Don't send anything and let SACKs drive out the
12883                                  * data unless wen have a "full" segment to send.
12884                                  */
12885                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
12886                                         sctp_log_nagle_event(stcb, SCTP_NAGLE_APPLIED);
12887                                 }
12888                                 SCTP_STAT_INCR(sctps_naglequeued);
12889                                 nagle_applies = 1;
12890                         } else {
12891                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
12892                                         if (sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY))
12893                                                 sctp_log_nagle_event(stcb, SCTP_NAGLE_SKIPPED);
12894                                 }
12895                                 SCTP_STAT_INCR(sctps_naglesent);
12896                                 nagle_applies = 0;
12897                         }
12898                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
12899
12900                                 sctp_misc_ints(SCTP_CWNDLOG_PRESEND, queue_only_for_init, queue_only,
12901                                     nagle_applies, un_sent);
12902                                 sctp_misc_ints(SCTP_CWNDLOG_PRESEND, stcb->asoc.total_output_queue_size,
12903                                     stcb->asoc.total_flight,
12904                                     stcb->asoc.chunks_on_out_queue, stcb->asoc.total_flight_count);
12905                         }
12906                         if (queue_only_for_init)
12907                                 queue_only_for_init = 0;
12908                         if ((queue_only == 0) && (nagle_applies == 0)) {
12909                                 /*-
12910                                  * need to start chunk output
12911                                  * before blocking.. note that if
12912                                  * a lock is already applied, then
12913                                  * the input via the net is happening
12914                                  * and I don't need to start output :-D
12915                                  */
12916                                 if (hold_tcblock == 0) {
12917                                         if (SCTP_TCB_TRYLOCK(stcb)) {
12918                                                 hold_tcblock = 1;
12919                                                 sctp_chunk_output(inp,
12920                                                     stcb,
12921                                                     SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
12922                                         }
12923                                 } else {
12924                                         sctp_chunk_output(inp,
12925                                             stcb,
12926                                             SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
12927                                 }
12928                                 if (hold_tcblock == 1) {
12929                                         SCTP_TCB_UNLOCK(stcb);
12930                                         hold_tcblock = 0;
12931                                 }
12932                         }
12933                         SOCKBUF_LOCK(&so->so_snd);
12934                         /*-
12935                          * This is a bit strange, but I think it will
12936                          * work. The total_output_queue_size is locked and
12937                          * protected by the TCB_LOCK, which we just released.
12938                          * There is a race that can occur between releasing it
12939                          * above, and me getting the socket lock, where sacks
12940                          * come in but we have not put the SB_WAIT on the
12941                          * so_snd buffer to get the wakeup. After the LOCK
12942                          * is applied the sack_processing will also need to
12943                          * LOCK the so->so_snd to do the actual sowwakeup(). So
12944                          * once we have the socket buffer lock if we recheck the
12945                          * size we KNOW we will get to sleep safely with the
12946                          * wakeup flag in place.
12947                          */
12948                         if (SCTP_SB_LIMIT_SND(so) <= (stcb->asoc.total_output_queue_size +
12949                             min(SCTP_BASE_SYSCTL(sctp_add_more_threshold), SCTP_SB_LIMIT_SND(so)))) {
12950                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
12951                                         sctp_log_block(SCTP_BLOCK_LOG_INTO_BLK,
12952                                             asoc, uio->uio_resid);
12953                                 }
12954                                 be.error = 0;
12955                                 stcb->block_entry = &be;
12956                                 error = sbwait(&so->so_snd);
12957                                 stcb->block_entry = NULL;
12958
12959                                 if (error || so->so_error || be.error) {
12960                                         if (error == 0) {
12961                                                 if (so->so_error)
12962                                                         error = so->so_error;
12963                                                 if (be.error) {
12964                                                         error = be.error;
12965                                                 }
12966                                         }
12967                                         SOCKBUF_UNLOCK(&so->so_snd);
12968                                         goto out_unlocked;
12969                                 }
12970                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
12971                                         sctp_log_block(SCTP_BLOCK_LOG_OUTOF_BLK,
12972                                             asoc, stcb->asoc.total_output_queue_size);
12973                                 }
12974                         }
12975                         SOCKBUF_UNLOCK(&so->so_snd);
12976                         if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
12977                                 goto out_unlocked;
12978                         }
12979                 }
12980                 SCTP_TCB_SEND_LOCK(stcb);
12981                 if (sp) {
12982                         if (sp->msg_is_complete == 0) {
12983                                 strm->last_msg_incomplete = 1;
12984                                 asoc->stream_locked = 1;
12985                                 asoc->stream_locked_on = srcv->sinfo_stream;
12986                         } else {
12987                                 sp->sender_all_done = 1;
12988                                 strm->last_msg_incomplete = 0;
12989                                 asoc->stream_locked = 0;
12990                         }
12991                 } else {
12992                         SCTP_PRINTF("Huh no sp TSNH?\n");
12993                         strm->last_msg_incomplete = 0;
12994                         asoc->stream_locked = 0;
12995                 }
12996                 SCTP_TCB_SEND_UNLOCK(stcb);
12997                 if (uio->uio_resid == 0) {
12998                         got_all_of_the_send = 1;
12999                 }
13000         } else {
13001                 /* We send in a 0, since we do NOT have any locks */
13002                 error = sctp_msg_append(stcb, net, top, srcv, 0);
13003                 top = NULL;
13004                 if (srcv->sinfo_flags & SCTP_EOF) {
13005                         /*
13006                          * This should only happen for Panda for the mbuf
13007                          * send case, which does NOT yet support EEOR mode.
13008                          * Thus, we can just set this flag to do the proper
13009                          * EOF handling.
13010                          */
13011                         got_all_of_the_send = 1;
13012                 }
13013         }
13014         if (error) {
13015                 goto out;
13016         }
13017 dataless_eof:
13018         /* EOF thing ? */
13019         if ((srcv->sinfo_flags & SCTP_EOF) &&
13020             (got_all_of_the_send == 1)) {
13021                 int cnt;
13022
13023                 SCTP_STAT_INCR(sctps_sends_with_eof);
13024                 error = 0;
13025                 if (hold_tcblock == 0) {
13026                         SCTP_TCB_LOCK(stcb);
13027                         hold_tcblock = 1;
13028                 }
13029                 cnt = sctp_is_there_unsent_data(stcb, SCTP_SO_LOCKED);
13030                 if (TAILQ_EMPTY(&asoc->send_queue) &&
13031                     TAILQ_EMPTY(&asoc->sent_queue) &&
13032                     (cnt == 0)) {
13033                         if (asoc->locked_on_sending) {
13034                                 goto abort_anyway;
13035                         }
13036                         /* there is nothing queued to send, so I'm done... */
13037                         if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) &&
13038                             (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
13039                             (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
13040                                 struct sctp_nets *netp;
13041
13042                                 /* only send SHUTDOWN the first time through */
13043                                 if (SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) {
13044                                         SCTP_STAT_DECR_GAUGE32(sctps_currestab);
13045                                 }
13046                                 SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_SENT);
13047                                 SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING);
13048                                 sctp_stop_timers_for_shutdown(stcb);
13049                                 if (stcb->asoc.alternate) {
13050                                         netp = stcb->asoc.alternate;
13051                                 } else {
13052                                         netp = stcb->asoc.primary_destination;
13053                                 }
13054                                 sctp_send_shutdown(stcb, netp);
13055                                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb,
13056                                     netp);
13057                                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
13058                                     asoc->primary_destination);
13059                         }
13060                 } else {
13061                         /*-
13062                          * we still got (or just got) data to send, so set
13063                          * SHUTDOWN_PENDING
13064                          */
13065                         /*-
13066                          * XXX sockets draft says that SCTP_EOF should be
13067                          * sent with no data.  currently, we will allow user
13068                          * data to be sent first and move to
13069                          * SHUTDOWN-PENDING
13070                          */
13071                         if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) &&
13072                             (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
13073                             (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
13074                                 if (hold_tcblock == 0) {
13075                                         SCTP_TCB_LOCK(stcb);
13076                                         hold_tcblock = 1;
13077                                 }
13078                                 if (asoc->locked_on_sending) {
13079                                         /* Locked to send out the data */
13080                                         struct sctp_stream_queue_pending *sp;
13081
13082                                         sp = TAILQ_LAST(&asoc->locked_on_sending->outqueue, sctp_streamhead);
13083                                         if (sp) {
13084                                                 if ((sp->length == 0) && (sp->msg_is_complete == 0))
13085                                                         asoc->state |= SCTP_STATE_PARTIAL_MSG_LEFT;
13086                                         }
13087                                 }
13088                                 asoc->state |= SCTP_STATE_SHUTDOWN_PENDING;
13089                                 if (TAILQ_EMPTY(&asoc->send_queue) &&
13090                                     TAILQ_EMPTY(&asoc->sent_queue) &&
13091                                     (asoc->state & SCTP_STATE_PARTIAL_MSG_LEFT)) {
13092                         abort_anyway:
13093                                         if (free_cnt_applied) {
13094                                                 atomic_add_int(&stcb->asoc.refcnt, -1);
13095                                                 free_cnt_applied = 0;
13096                                         }
13097                                         sctp_abort_an_association(stcb->sctp_ep, stcb,
13098                                             NULL, SCTP_SO_LOCKED);
13099                                         /*
13100                                          * now relock the stcb so everything
13101                                          * is sane
13102                                          */
13103                                         hold_tcblock = 0;
13104                                         stcb = NULL;
13105                                         goto out;
13106                                 }
13107                                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
13108                                     asoc->primary_destination);
13109                                 sctp_feature_off(inp, SCTP_PCB_FLAGS_NODELAY);
13110                         }
13111                 }
13112         }
13113 skip_out_eof:
13114         if (!TAILQ_EMPTY(&stcb->asoc.control_send_queue)) {
13115                 some_on_control = 1;
13116         }
13117         if (queue_only_for_init) {
13118                 if (hold_tcblock == 0) {
13119                         SCTP_TCB_LOCK(stcb);
13120                         hold_tcblock = 1;
13121                 }
13122                 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_OPEN) {
13123                         /* a collision took us forward? */
13124                         queue_only = 0;
13125                 } else {
13126                         sctp_send_initiate(inp, stcb, SCTP_SO_LOCKED);
13127                         SCTP_SET_STATE(&stcb->asoc, SCTP_STATE_COOKIE_WAIT);
13128                         queue_only = 1;
13129                 }
13130         }
13131         if ((net->flight_size > net->cwnd) &&
13132             (stcb->asoc.sctp_cmt_on_off == 0)) {
13133                 SCTP_STAT_INCR(sctps_send_cwnd_avoid);
13134                 queue_only = 1;
13135         } else if (asoc->ifp_had_enobuf) {
13136                 SCTP_STAT_INCR(sctps_ifnomemqueued);
13137                 if (net->flight_size > (2 * net->mtu)) {
13138                         queue_only = 1;
13139                 }
13140                 asoc->ifp_had_enobuf = 0;
13141         }
13142         un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
13143             (stcb->asoc.stream_queue_cnt * sizeof(struct sctp_data_chunk)));
13144         if ((sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY)) &&
13145             (stcb->asoc.total_flight > 0) &&
13146             (stcb->asoc.stream_queue_cnt < SCTP_MAX_DATA_BUNDLING) &&
13147             (un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD))) {
13148                 /*-
13149                  * Ok, Nagle is set on and we have data outstanding.
13150                  * Don't send anything and let SACKs drive out the
13151                  * data unless wen have a "full" segment to send.
13152                  */
13153                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
13154                         sctp_log_nagle_event(stcb, SCTP_NAGLE_APPLIED);
13155                 }
13156                 SCTP_STAT_INCR(sctps_naglequeued);
13157                 nagle_applies = 1;
13158         } else {
13159                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
13160                         if (sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY))
13161                                 sctp_log_nagle_event(stcb, SCTP_NAGLE_SKIPPED);
13162                 }
13163                 SCTP_STAT_INCR(sctps_naglesent);
13164                 nagle_applies = 0;
13165         }
13166         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13167                 sctp_misc_ints(SCTP_CWNDLOG_PRESEND, queue_only_for_init, queue_only,
13168                     nagle_applies, un_sent);
13169                 sctp_misc_ints(SCTP_CWNDLOG_PRESEND, stcb->asoc.total_output_queue_size,
13170                     stcb->asoc.total_flight,
13171                     stcb->asoc.chunks_on_out_queue, stcb->asoc.total_flight_count);
13172         }
13173         if ((queue_only == 0) && (nagle_applies == 0) && (stcb->asoc.peers_rwnd && un_sent)) {
13174                 /* we can attempt to send too. */
13175                 if (hold_tcblock == 0) {
13176                         /*
13177                          * If there is activity recv'ing sacks no need to
13178                          * send
13179                          */
13180                         if (SCTP_TCB_TRYLOCK(stcb)) {
13181                                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13182                                 hold_tcblock = 1;
13183                         }
13184                 } else {
13185                         sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13186                 }
13187         } else if ((queue_only == 0) &&
13188                     (stcb->asoc.peers_rwnd == 0) &&
13189             (stcb->asoc.total_flight == 0)) {
13190                 /* We get to have a probe outstanding */
13191                 if (hold_tcblock == 0) {
13192                         hold_tcblock = 1;
13193                         SCTP_TCB_LOCK(stcb);
13194                 }
13195                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13196         } else if (some_on_control) {
13197                 int num_out, reason, frag_point;
13198
13199                 /* Here we do control only */
13200                 if (hold_tcblock == 0) {
13201                         hold_tcblock = 1;
13202                         SCTP_TCB_LOCK(stcb);
13203                 }
13204                 frag_point = sctp_get_frag_point(stcb, &stcb->asoc);
13205                 (void)sctp_med_chunk_output(inp, stcb, &stcb->asoc, &num_out,
13206                     &reason, 1, 1, &now, &now_filled, frag_point, SCTP_SO_LOCKED);
13207         }
13208         SCTPDBG(SCTP_DEBUG_OUTPUT1, "USR Send complete qo:%d prw:%d unsent:%d tf:%d cooq:%d toqs:%d err:%d\n",
13209             queue_only, stcb->asoc.peers_rwnd, un_sent,
13210             stcb->asoc.total_flight, stcb->asoc.chunks_on_out_queue,
13211             stcb->asoc.total_output_queue_size, error);
13212
13213 out:
13214 out_unlocked:
13215
13216         if (local_soresv && stcb) {
13217                 atomic_subtract_int(&stcb->asoc.sb_send_resv, sndlen);
13218         }
13219         if (create_lock_applied) {
13220                 SCTP_ASOC_CREATE_UNLOCK(inp);
13221         }
13222         if ((stcb) && hold_tcblock) {
13223                 SCTP_TCB_UNLOCK(stcb);
13224         }
13225         if (stcb && free_cnt_applied) {
13226                 atomic_add_int(&stcb->asoc.refcnt, -1);
13227         }
13228 #ifdef INVARIANTS
13229         if (stcb) {
13230                 if (mtx_owned(&stcb->tcb_mtx)) {
13231                         panic("Leaving with tcb mtx owned?");
13232                 }
13233                 if (mtx_owned(&stcb->tcb_send_mtx)) {
13234                         panic("Leaving with tcb send mtx owned?");
13235                 }
13236         }
13237 #endif
13238 #ifdef INVARIANTS
13239         if (inp) {
13240                 sctp_validate_no_locks(inp);
13241         } else {
13242                 SCTP_PRINTF("Warning - inp is NULL so cant validate locks\n");
13243         }
13244 #endif
13245         if (top) {
13246                 sctp_m_freem(top);
13247         }
13248         if (control) {
13249                 sctp_m_freem(control);
13250         }
13251         return (error);
13252 }
13253
13254
13255 /*
13256  * generate an AUTHentication chunk, if required
13257  */
13258 struct mbuf *
13259 sctp_add_auth_chunk(struct mbuf *m, struct mbuf **m_end,
13260     struct sctp_auth_chunk **auth_ret, uint32_t * offset,
13261     struct sctp_tcb *stcb, uint8_t chunk)
13262 {
13263         struct mbuf *m_auth;
13264         struct sctp_auth_chunk *auth;
13265         int chunk_len;
13266         struct mbuf *cn;
13267
13268         if ((m_end == NULL) || (auth_ret == NULL) || (offset == NULL) ||
13269             (stcb == NULL))
13270                 return (m);
13271
13272         /* sysctl disabled auth? */
13273         if (SCTP_BASE_SYSCTL(sctp_auth_disable))
13274                 return (m);
13275
13276         /* peer doesn't do auth... */
13277         if (!stcb->asoc.peer_supports_auth) {
13278                 return (m);
13279         }
13280         /* does the requested chunk require auth? */
13281         if (!sctp_auth_is_required_chunk(chunk, stcb->asoc.peer_auth_chunks)) {
13282                 return (m);
13283         }
13284         m_auth = sctp_get_mbuf_for_msg(sizeof(*auth), 0, M_NOWAIT, 1, MT_HEADER);
13285         if (m_auth == NULL) {
13286                 /* no mbuf's */
13287                 return (m);
13288         }
13289         /* reserve some space if this will be the first mbuf */
13290         if (m == NULL)
13291                 SCTP_BUF_RESV_UF(m_auth, SCTP_MIN_OVERHEAD);
13292         /* fill in the AUTH chunk details */
13293         auth = mtod(m_auth, struct sctp_auth_chunk *);
13294         bzero(auth, sizeof(*auth));
13295         auth->ch.chunk_type = SCTP_AUTHENTICATION;
13296         auth->ch.chunk_flags = 0;
13297         chunk_len = sizeof(*auth) +
13298             sctp_get_hmac_digest_len(stcb->asoc.peer_hmac_id);
13299         auth->ch.chunk_length = htons(chunk_len);
13300         auth->hmac_id = htons(stcb->asoc.peer_hmac_id);
13301         /* key id and hmac digest will be computed and filled in upon send */
13302
13303         /* save the offset where the auth was inserted into the chain */
13304         *offset = 0;
13305         for (cn = m; cn; cn = SCTP_BUF_NEXT(cn)) {
13306                 *offset += SCTP_BUF_LEN(cn);
13307         }
13308
13309         /* update length and return pointer to the auth chunk */
13310         SCTP_BUF_LEN(m_auth) = chunk_len;
13311         m = sctp_copy_mbufchain(m_auth, m, m_end, 1, chunk_len, 0);
13312         if (auth_ret != NULL)
13313                 *auth_ret = auth;
13314
13315         return (m);
13316 }
13317
13318 #ifdef INET6
13319 int
13320 sctp_v6src_match_nexthop(struct sockaddr_in6 *src6, sctp_route_t * ro)
13321 {
13322         struct nd_prefix *pfx = NULL;
13323         struct nd_pfxrouter *pfxrtr = NULL;
13324         struct sockaddr_in6 gw6;
13325
13326         if (ro == NULL || ro->ro_rt == NULL || src6->sin6_family != AF_INET6)
13327                 return (0);
13328
13329         /* get prefix entry of address */
13330         LIST_FOREACH(pfx, &MODULE_GLOBAL(nd_prefix), ndpr_entry) {
13331                 if (pfx->ndpr_stateflags & NDPRF_DETACHED)
13332                         continue;
13333                 if (IN6_ARE_MASKED_ADDR_EQUAL(&pfx->ndpr_prefix.sin6_addr,
13334                     &src6->sin6_addr, &pfx->ndpr_mask))
13335                         break;
13336         }
13337         /* no prefix entry in the prefix list */
13338         if (pfx == NULL) {
13339                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "No prefix entry for ");
13340                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)src6);
13341                 return (0);
13342         }
13343         SCTPDBG(SCTP_DEBUG_OUTPUT2, "v6src_match_nexthop(), Prefix entry is ");
13344         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)src6);
13345
13346         /* search installed gateway from prefix entry */
13347         LIST_FOREACH(pfxrtr, &pfx->ndpr_advrtrs, pfr_entry) {
13348                 memset(&gw6, 0, sizeof(struct sockaddr_in6));
13349                 gw6.sin6_family = AF_INET6;
13350                 gw6.sin6_len = sizeof(struct sockaddr_in6);
13351                 memcpy(&gw6.sin6_addr, &pfxrtr->router->rtaddr,
13352                     sizeof(struct in6_addr));
13353                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "prefix router is ");
13354                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)&gw6);
13355                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "installed router is ");
13356                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, ro->ro_rt->rt_gateway);
13357                 if (sctp_cmpaddr((struct sockaddr *)&gw6,
13358                     ro->ro_rt->rt_gateway)) {
13359                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "pfxrouter is installed\n");
13360                         return (1);
13361                 }
13362         }
13363         SCTPDBG(SCTP_DEBUG_OUTPUT2, "pfxrouter is not installed\n");
13364         return (0);
13365 }
13366
13367 #endif
13368
13369 int
13370 sctp_v4src_match_nexthop(struct sctp_ifa *sifa, sctp_route_t * ro)
13371 {
13372 #ifdef INET
13373         struct sockaddr_in *sin, *mask;
13374         struct ifaddr *ifa;
13375         struct in_addr srcnetaddr, gwnetaddr;
13376
13377         if (ro == NULL || ro->ro_rt == NULL ||
13378             sifa->address.sa.sa_family != AF_INET) {
13379                 return (0);
13380         }
13381         ifa = (struct ifaddr *)sifa->ifa;
13382         mask = (struct sockaddr_in *)(ifa->ifa_netmask);
13383         sin = (struct sockaddr_in *)&sifa->address.sin;
13384         srcnetaddr.s_addr = (sin->sin_addr.s_addr & mask->sin_addr.s_addr);
13385         SCTPDBG(SCTP_DEBUG_OUTPUT1, "match_nexthop4: src address is ");
13386         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, &sifa->address.sa);
13387         SCTPDBG(SCTP_DEBUG_OUTPUT1, "network address is %x\n", srcnetaddr.s_addr);
13388
13389         sin = (struct sockaddr_in *)ro->ro_rt->rt_gateway;
13390         gwnetaddr.s_addr = (sin->sin_addr.s_addr & mask->sin_addr.s_addr);
13391         SCTPDBG(SCTP_DEBUG_OUTPUT1, "match_nexthop4: nexthop is ");
13392         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, ro->ro_rt->rt_gateway);
13393         SCTPDBG(SCTP_DEBUG_OUTPUT1, "network address is %x\n", gwnetaddr.s_addr);
13394         if (srcnetaddr.s_addr == gwnetaddr.s_addr) {
13395                 return (1);
13396         }
13397 #endif
13398         return (0);
13399 }