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     int ipv4_addr_legal,
1867     int ipv6_addr_legal,
1868     int loopback_scope,
1869     int ipv4_local_scope,
1870     int local_scope SCTP_UNUSED,/* XXX */
1871     int site_scope,
1872     int do_update)
1873 {
1874         if ((loopback_scope == 0) &&
1875             (ifa->ifn_p) && SCTP_IFN_IS_IFT_LOOP(ifa->ifn_p)) {
1876                 /*
1877                  * skip loopback if not in scope *
1878                  */
1879                 return (0);
1880         }
1881         switch (ifa->address.sa.sa_family) {
1882 #ifdef INET
1883         case AF_INET:
1884                 if (ipv4_addr_legal) {
1885                         struct sockaddr_in *sin;
1886
1887                         sin = (struct sockaddr_in *)&ifa->address.sin;
1888                         if (sin->sin_addr.s_addr == 0) {
1889                                 /* not in scope , unspecified */
1890                                 return (0);
1891                         }
1892                         if ((ipv4_local_scope == 0) &&
1893                             (IN4_ISPRIVATE_ADDRESS(&sin->sin_addr))) {
1894                                 /* private address not in scope */
1895                                 return (0);
1896                         }
1897                 } else {
1898                         return (0);
1899                 }
1900                 break;
1901 #endif
1902 #ifdef INET6
1903         case AF_INET6:
1904                 if (ipv6_addr_legal) {
1905                         struct sockaddr_in6 *sin6;
1906
1907                         /*
1908                          * Must update the flags,  bummer, which means any
1909                          * IFA locks must now be applied HERE <->
1910                          */
1911                         if (do_update) {
1912                                 sctp_gather_internal_ifa_flags(ifa);
1913                         }
1914                         if (ifa->localifa_flags & SCTP_ADDR_IFA_UNUSEABLE) {
1915                                 return (0);
1916                         }
1917                         /* ok to use deprecated addresses? */
1918                         sin6 = (struct sockaddr_in6 *)&ifa->address.sin6;
1919                         if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) {
1920                                 /* skip unspecifed addresses */
1921                                 return (0);
1922                         }
1923                         if (    /* (local_scope == 0) && */
1924                             (IN6_IS_ADDR_LINKLOCAL(&sin6->sin6_addr))) {
1925                                 return (0);
1926                         }
1927                         if ((site_scope == 0) &&
1928                             (IN6_IS_ADDR_SITELOCAL(&sin6->sin6_addr))) {
1929                                 return (0);
1930                         }
1931                 } else {
1932                         return (0);
1933                 }
1934                 break;
1935 #endif
1936         default:
1937                 return (0);
1938         }
1939         return (1);
1940 }
1941
1942 static struct mbuf *
1943 sctp_add_addr_to_mbuf(struct mbuf *m, struct sctp_ifa *ifa)
1944 {
1945         struct sctp_paramhdr *parmh;
1946         struct mbuf *mret;
1947         int len;
1948
1949         switch (ifa->address.sa.sa_family) {
1950 #ifdef INET
1951         case AF_INET:
1952                 len = sizeof(struct sctp_ipv4addr_param);
1953                 break;
1954 #endif
1955 #ifdef INET6
1956         case AF_INET6:
1957                 len = sizeof(struct sctp_ipv6addr_param);
1958                 break;
1959 #endif
1960         default:
1961                 return (m);
1962         }
1963         if (M_TRAILINGSPACE(m) >= len) {
1964                 /* easy side we just drop it on the end */
1965                 parmh = (struct sctp_paramhdr *)(SCTP_BUF_AT(m, SCTP_BUF_LEN(m)));
1966                 mret = m;
1967         } else {
1968                 /* Need more space */
1969                 mret = m;
1970                 while (SCTP_BUF_NEXT(mret) != NULL) {
1971                         mret = SCTP_BUF_NEXT(mret);
1972                 }
1973                 SCTP_BUF_NEXT(mret) = sctp_get_mbuf_for_msg(len, 0, M_DONTWAIT, 1, MT_DATA);
1974                 if (SCTP_BUF_NEXT(mret) == NULL) {
1975                         /* We are hosed, can't add more addresses */
1976                         return (m);
1977                 }
1978                 mret = SCTP_BUF_NEXT(mret);
1979                 parmh = mtod(mret, struct sctp_paramhdr *);
1980         }
1981         /* now add the parameter */
1982         switch (ifa->address.sa.sa_family) {
1983 #ifdef INET
1984         case AF_INET:
1985                 {
1986                         struct sctp_ipv4addr_param *ipv4p;
1987                         struct sockaddr_in *sin;
1988
1989                         sin = (struct sockaddr_in *)&ifa->address.sin;
1990                         ipv4p = (struct sctp_ipv4addr_param *)parmh;
1991                         parmh->param_type = htons(SCTP_IPV4_ADDRESS);
1992                         parmh->param_length = htons(len);
1993                         ipv4p->addr = sin->sin_addr.s_addr;
1994                         SCTP_BUF_LEN(mret) += len;
1995                         break;
1996                 }
1997 #endif
1998 #ifdef INET6
1999         case AF_INET6:
2000                 {
2001                         struct sctp_ipv6addr_param *ipv6p;
2002                         struct sockaddr_in6 *sin6;
2003
2004                         sin6 = (struct sockaddr_in6 *)&ifa->address.sin6;
2005                         ipv6p = (struct sctp_ipv6addr_param *)parmh;
2006                         parmh->param_type = htons(SCTP_IPV6_ADDRESS);
2007                         parmh->param_length = htons(len);
2008                         memcpy(ipv6p->addr, &sin6->sin6_addr,
2009                             sizeof(ipv6p->addr));
2010                         /* clear embedded scope in the address */
2011                         in6_clearscope((struct in6_addr *)ipv6p->addr);
2012                         SCTP_BUF_LEN(mret) += len;
2013                         break;
2014                 }
2015 #endif
2016         default:
2017                 return (m);
2018         }
2019         return (mret);
2020 }
2021
2022
2023 struct mbuf *
2024 sctp_add_addresses_to_i_ia(struct sctp_inpcb *inp, struct sctp_tcb *stcb,
2025     struct sctp_scoping *scope,
2026     struct mbuf *m_at, int cnt_inits_to)
2027 {
2028         struct sctp_vrf *vrf = NULL;
2029         int cnt, limit_out = 0, total_count;
2030         uint32_t vrf_id;
2031
2032         vrf_id = inp->def_vrf_id;
2033         SCTP_IPI_ADDR_RLOCK();
2034         vrf = sctp_find_vrf(vrf_id);
2035         if (vrf == NULL) {
2036                 SCTP_IPI_ADDR_RUNLOCK();
2037                 return (m_at);
2038         }
2039         if (inp->sctp_flags & SCTP_PCB_FLAGS_BOUNDALL) {
2040                 struct sctp_ifa *sctp_ifap;
2041                 struct sctp_ifn *sctp_ifnp;
2042
2043                 cnt = cnt_inits_to;
2044                 if (vrf->total_ifa_count > SCTP_COUNT_LIMIT) {
2045                         limit_out = 1;
2046                         cnt = SCTP_ADDRESS_LIMIT;
2047                         goto skip_count;
2048                 }
2049                 LIST_FOREACH(sctp_ifnp, &vrf->ifnlist, next_ifn) {
2050                         if ((scope->loopback_scope == 0) &&
2051                             SCTP_IFN_IS_IFT_LOOP(sctp_ifnp)) {
2052                                 /*
2053                                  * Skip loopback devices if loopback_scope
2054                                  * not set
2055                                  */
2056                                 continue;
2057                         }
2058                         LIST_FOREACH(sctp_ifap, &sctp_ifnp->ifalist, next_ifa) {
2059                                 if (sctp_is_addr_restricted(stcb, sctp_ifap)) {
2060                                         continue;
2061                                 }
2062                                 if (sctp_is_address_in_scope(sctp_ifap,
2063                                     scope->ipv4_addr_legal,
2064                                     scope->ipv6_addr_legal,
2065                                     scope->loopback_scope,
2066                                     scope->ipv4_local_scope,
2067                                     scope->local_scope,
2068                                     scope->site_scope, 1) == 0) {
2069                                         continue;
2070                                 }
2071                                 cnt++;
2072                                 if (cnt > SCTP_ADDRESS_LIMIT) {
2073                                         break;
2074                                 }
2075                         }
2076                         if (cnt > SCTP_ADDRESS_LIMIT) {
2077                                 break;
2078                         }
2079                 }
2080 skip_count:
2081                 if (cnt > 1) {
2082                         total_count = 0;
2083                         LIST_FOREACH(sctp_ifnp, &vrf->ifnlist, next_ifn) {
2084                                 cnt = 0;
2085                                 if ((scope->loopback_scope == 0) &&
2086                                     SCTP_IFN_IS_IFT_LOOP(sctp_ifnp)) {
2087                                         /*
2088                                          * Skip loopback devices if
2089                                          * loopback_scope not set
2090                                          */
2091                                         continue;
2092                                 }
2093                                 LIST_FOREACH(sctp_ifap, &sctp_ifnp->ifalist, next_ifa) {
2094                                         if (sctp_is_addr_restricted(stcb, sctp_ifap)) {
2095                                                 continue;
2096                                         }
2097                                         if (sctp_is_address_in_scope(sctp_ifap,
2098                                             scope->ipv4_addr_legal,
2099                                             scope->ipv6_addr_legal,
2100                                             scope->loopback_scope,
2101                                             scope->ipv4_local_scope,
2102                                             scope->local_scope,
2103                                             scope->site_scope, 0) == 0) {
2104                                                 continue;
2105                                         }
2106                                         m_at = sctp_add_addr_to_mbuf(m_at, sctp_ifap);
2107                                         if (limit_out) {
2108                                                 cnt++;
2109                                                 total_count++;
2110                                                 if (cnt >= 2) {
2111                                                         /*
2112                                                          * two from each
2113                                                          * address
2114                                                          */
2115                                                         break;
2116                                                 }
2117                                                 if (total_count > SCTP_ADDRESS_LIMIT) {
2118                                                         /* No more addresses */
2119                                                         break;
2120                                                 }
2121                                         }
2122                                 }
2123                         }
2124                 }
2125         } else {
2126                 struct sctp_laddr *laddr;
2127
2128                 cnt = cnt_inits_to;
2129                 /* First, how many ? */
2130                 LIST_FOREACH(laddr, &inp->sctp_addr_list, sctp_nxt_addr) {
2131                         if (laddr->ifa == NULL) {
2132                                 continue;
2133                         }
2134                         if (laddr->ifa->localifa_flags & SCTP_BEING_DELETED)
2135                                 /*
2136                                  * Address being deleted by the system, dont
2137                                  * list.
2138                                  */
2139                                 continue;
2140                         if (laddr->action == SCTP_DEL_IP_ADDRESS) {
2141                                 /*
2142                                  * Address being deleted on this ep don't
2143                                  * list.
2144                                  */
2145                                 continue;
2146                         }
2147                         if (sctp_is_address_in_scope(laddr->ifa,
2148                             scope->ipv4_addr_legal,
2149                             scope->ipv6_addr_legal,
2150                             scope->loopback_scope,
2151                             scope->ipv4_local_scope,
2152                             scope->local_scope,
2153                             scope->site_scope, 1) == 0) {
2154                                 continue;
2155                         }
2156                         cnt++;
2157                 }
2158                 /*
2159                  * To get through a NAT we only list addresses if we have
2160                  * more than one. That way if you just bind a single address
2161                  * we let the source of the init dictate our address.
2162                  */
2163                 if (cnt > 1) {
2164                         cnt = cnt_inits_to;
2165                         LIST_FOREACH(laddr, &inp->sctp_addr_list, sctp_nxt_addr) {
2166                                 if (laddr->ifa == NULL) {
2167                                         continue;
2168                                 }
2169                                 if (laddr->ifa->localifa_flags & SCTP_BEING_DELETED) {
2170                                         continue;
2171                                 }
2172                                 if (sctp_is_address_in_scope(laddr->ifa,
2173                                     scope->ipv4_addr_legal,
2174                                     scope->ipv6_addr_legal,
2175                                     scope->loopback_scope,
2176                                     scope->ipv4_local_scope,
2177                                     scope->local_scope,
2178                                     scope->site_scope, 0) == 0) {
2179                                         continue;
2180                                 }
2181                                 m_at = sctp_add_addr_to_mbuf(m_at, laddr->ifa);
2182                                 cnt++;
2183                                 if (cnt >= SCTP_ADDRESS_LIMIT) {
2184                                         break;
2185                                 }
2186                         }
2187                 }
2188         }
2189         SCTP_IPI_ADDR_RUNLOCK();
2190         return (m_at);
2191 }
2192
2193 static struct sctp_ifa *
2194 sctp_is_ifa_addr_preferred(struct sctp_ifa *ifa,
2195     uint8_t dest_is_loop,
2196     uint8_t dest_is_priv,
2197     sa_family_t fam)
2198 {
2199         uint8_t dest_is_global = 0;
2200
2201         /* dest_is_priv is true if destination is a private address */
2202         /* dest_is_loop is true if destination is a loopback addresses */
2203
2204         /**
2205          * Here we determine if its a preferred address. A preferred address
2206          * means it is the same scope or higher scope then the destination.
2207          * L = loopback, P = private, G = global
2208          * -----------------------------------------
2209          *    src    |  dest | result
2210          *  ----------------------------------------
2211          *     L     |    L  |    yes
2212          *  -----------------------------------------
2213          *     P     |    L  |    yes-v4 no-v6
2214          *  -----------------------------------------
2215          *     G     |    L  |    yes-v4 no-v6
2216          *  -----------------------------------------
2217          *     L     |    P  |    no
2218          *  -----------------------------------------
2219          *     P     |    P  |    yes
2220          *  -----------------------------------------
2221          *     G     |    P  |    no
2222          *   -----------------------------------------
2223          *     L     |    G  |    no
2224          *   -----------------------------------------
2225          *     P     |    G  |    no
2226          *    -----------------------------------------
2227          *     G     |    G  |    yes
2228          *    -----------------------------------------
2229          */
2230
2231         if (ifa->address.sa.sa_family != fam) {
2232                 /* forget mis-matched family */
2233                 return (NULL);
2234         }
2235         if ((dest_is_priv == 0) && (dest_is_loop == 0)) {
2236                 dest_is_global = 1;
2237         }
2238         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Is destination preferred:");
2239         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, &ifa->address.sa);
2240         /* Ok the address may be ok */
2241 #ifdef INET6
2242         if (fam == AF_INET6) {
2243                 /* ok to use deprecated addresses? no lets not! */
2244                 if (ifa->localifa_flags & SCTP_ADDR_IFA_UNUSEABLE) {
2245                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:1\n");
2246                         return (NULL);
2247                 }
2248                 if (ifa->src_is_priv && !ifa->src_is_loop) {
2249                         if (dest_is_loop) {
2250                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:2\n");
2251                                 return (NULL);
2252                         }
2253                 }
2254                 if (ifa->src_is_glob) {
2255                         if (dest_is_loop) {
2256                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:3\n");
2257                                 return (NULL);
2258                         }
2259                 }
2260         }
2261 #endif
2262         /*
2263          * Now that we know what is what, implement or table this could in
2264          * theory be done slicker (it used to be), but this is
2265          * straightforward and easier to validate :-)
2266          */
2267         SCTPDBG(SCTP_DEBUG_OUTPUT3, "src_loop:%d src_priv:%d src_glob:%d\n",
2268             ifa->src_is_loop, ifa->src_is_priv, ifa->src_is_glob);
2269         SCTPDBG(SCTP_DEBUG_OUTPUT3, "dest_loop:%d dest_priv:%d dest_glob:%d\n",
2270             dest_is_loop, dest_is_priv, dest_is_global);
2271
2272         if ((ifa->src_is_loop) && (dest_is_priv)) {
2273                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:4\n");
2274                 return (NULL);
2275         }
2276         if ((ifa->src_is_glob) && (dest_is_priv)) {
2277                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:5\n");
2278                 return (NULL);
2279         }
2280         if ((ifa->src_is_loop) && (dest_is_global)) {
2281                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:6\n");
2282                 return (NULL);
2283         }
2284         if ((ifa->src_is_priv) && (dest_is_global)) {
2285                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:7\n");
2286                 return (NULL);
2287         }
2288         SCTPDBG(SCTP_DEBUG_OUTPUT3, "YES\n");
2289         /* its a preferred address */
2290         return (ifa);
2291 }
2292
2293 static struct sctp_ifa *
2294 sctp_is_ifa_addr_acceptable(struct sctp_ifa *ifa,
2295     uint8_t dest_is_loop,
2296     uint8_t dest_is_priv,
2297     sa_family_t fam)
2298 {
2299         uint8_t dest_is_global = 0;
2300
2301         /**
2302          * Here we determine if its a acceptable address. A acceptable
2303          * address means it is the same scope or higher scope but we can
2304          * allow for NAT which means its ok to have a global dest and a
2305          * private src.
2306          *
2307          * L = loopback, P = private, G = global
2308          * -----------------------------------------
2309          *  src    |  dest | result
2310          * -----------------------------------------
2311          *   L     |   L   |    yes
2312          *  -----------------------------------------
2313          *   P     |   L   |    yes-v4 no-v6
2314          *  -----------------------------------------
2315          *   G     |   L   |    yes
2316          * -----------------------------------------
2317          *   L     |   P   |    no
2318          * -----------------------------------------
2319          *   P     |   P   |    yes
2320          * -----------------------------------------
2321          *   G     |   P   |    yes - May not work
2322          * -----------------------------------------
2323          *   L     |   G   |    no
2324          * -----------------------------------------
2325          *   P     |   G   |    yes - May not work
2326          * -----------------------------------------
2327          *   G     |   G   |    yes
2328          * -----------------------------------------
2329          */
2330
2331         if (ifa->address.sa.sa_family != fam) {
2332                 /* forget non matching family */
2333                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "ifa_fam:%d fam:%d\n",
2334                     ifa->address.sa.sa_family, fam);
2335                 return (NULL);
2336         }
2337         /* Ok the address may be ok */
2338         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT3, &ifa->address.sa);
2339         SCTPDBG(SCTP_DEBUG_OUTPUT3, "dst_is_loop:%d dest_is_priv:%d\n",
2340             dest_is_loop, dest_is_priv);
2341         if ((dest_is_loop == 0) && (dest_is_priv == 0)) {
2342                 dest_is_global = 1;
2343         }
2344 #ifdef INET6
2345         if (fam == AF_INET6) {
2346                 /* ok to use deprecated addresses? */
2347                 if (ifa->localifa_flags & SCTP_ADDR_IFA_UNUSEABLE) {
2348                         return (NULL);
2349                 }
2350                 if (ifa->src_is_priv) {
2351                         /* Special case, linklocal to loop */
2352                         if (dest_is_loop)
2353                                 return (NULL);
2354                 }
2355         }
2356 #endif
2357         /*
2358          * Now that we know what is what, implement our table. This could in
2359          * theory be done slicker (it used to be), but this is
2360          * straightforward and easier to validate :-)
2361          */
2362         SCTPDBG(SCTP_DEBUG_OUTPUT3, "ifa->src_is_loop:%d dest_is_priv:%d\n",
2363             ifa->src_is_loop,
2364             dest_is_priv);
2365         if ((ifa->src_is_loop == 1) && (dest_is_priv)) {
2366                 return (NULL);
2367         }
2368         SCTPDBG(SCTP_DEBUG_OUTPUT3, "ifa->src_is_loop:%d dest_is_glob:%d\n",
2369             ifa->src_is_loop,
2370             dest_is_global);
2371         if ((ifa->src_is_loop == 1) && (dest_is_global)) {
2372                 return (NULL);
2373         }
2374         SCTPDBG(SCTP_DEBUG_OUTPUT3, "address is acceptable\n");
2375         /* its an acceptable address */
2376         return (ifa);
2377 }
2378
2379 int
2380 sctp_is_addr_restricted(struct sctp_tcb *stcb, struct sctp_ifa *ifa)
2381 {
2382         struct sctp_laddr *laddr;
2383
2384         if (stcb == NULL) {
2385                 /* There are no restrictions, no TCB :-) */
2386                 return (0);
2387         }
2388         LIST_FOREACH(laddr, &stcb->asoc.sctp_restricted_addrs, sctp_nxt_addr) {
2389                 if (laddr->ifa == NULL) {
2390                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "%s: NULL ifa\n",
2391                             __FUNCTION__);
2392                         continue;
2393                 }
2394                 if (laddr->ifa == ifa) {
2395                         /* Yes it is on the list */
2396                         return (1);
2397                 }
2398         }
2399         return (0);
2400 }
2401
2402
2403 int
2404 sctp_is_addr_in_ep(struct sctp_inpcb *inp, struct sctp_ifa *ifa)
2405 {
2406         struct sctp_laddr *laddr;
2407
2408         if (ifa == NULL)
2409                 return (0);
2410         LIST_FOREACH(laddr, &inp->sctp_addr_list, sctp_nxt_addr) {
2411                 if (laddr->ifa == NULL) {
2412                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "%s: NULL ifa\n",
2413                             __FUNCTION__);
2414                         continue;
2415                 }
2416                 if ((laddr->ifa == ifa) && laddr->action == 0)
2417                         /* same pointer */
2418                         return (1);
2419         }
2420         return (0);
2421 }
2422
2423
2424
2425 static struct sctp_ifa *
2426 sctp_choose_boundspecific_inp(struct sctp_inpcb *inp,
2427     sctp_route_t * ro,
2428     uint32_t vrf_id,
2429     int non_asoc_addr_ok,
2430     uint8_t dest_is_priv,
2431     uint8_t dest_is_loop,
2432     sa_family_t fam)
2433 {
2434         struct sctp_laddr *laddr, *starting_point;
2435         void *ifn;
2436         int resettotop = 0;
2437         struct sctp_ifn *sctp_ifn;
2438         struct sctp_ifa *sctp_ifa, *sifa;
2439         struct sctp_vrf *vrf;
2440         uint32_t ifn_index;
2441
2442         vrf = sctp_find_vrf(vrf_id);
2443         if (vrf == NULL)
2444                 return (NULL);
2445
2446         ifn = SCTP_GET_IFN_VOID_FROM_ROUTE(ro);
2447         ifn_index = SCTP_GET_IF_INDEX_FROM_ROUTE(ro);
2448         sctp_ifn = sctp_find_ifn(ifn, ifn_index);
2449         /*
2450          * first question, is the ifn we will emit on in our list, if so, we
2451          * want such an address. Note that we first looked for a preferred
2452          * address.
2453          */
2454         if (sctp_ifn) {
2455                 /* is a preferred one on the interface we route out? */
2456                 LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
2457                         if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
2458                             (non_asoc_addr_ok == 0))
2459                                 continue;
2460                         sifa = sctp_is_ifa_addr_preferred(sctp_ifa,
2461                             dest_is_loop,
2462                             dest_is_priv, fam);
2463                         if (sifa == NULL)
2464                                 continue;
2465                         if (sctp_is_addr_in_ep(inp, sifa)) {
2466                                 atomic_add_int(&sifa->refcount, 1);
2467                                 return (sifa);
2468                         }
2469                 }
2470         }
2471         /*
2472          * ok, now we now need to find one on the list of the addresses. We
2473          * can't get one on the emitting interface so let's find first a
2474          * preferred one. If not that an acceptable one otherwise... we
2475          * return NULL.
2476          */
2477         starting_point = inp->next_addr_touse;
2478 once_again:
2479         if (inp->next_addr_touse == NULL) {
2480                 inp->next_addr_touse = LIST_FIRST(&inp->sctp_addr_list);
2481                 resettotop = 1;
2482         }
2483         for (laddr = inp->next_addr_touse; laddr;
2484             laddr = LIST_NEXT(laddr, sctp_nxt_addr)) {
2485                 if (laddr->ifa == NULL) {
2486                         /* address has been removed */
2487                         continue;
2488                 }
2489                 if (laddr->action == SCTP_DEL_IP_ADDRESS) {
2490                         /* address is being deleted */
2491                         continue;
2492                 }
2493                 sifa = sctp_is_ifa_addr_preferred(laddr->ifa, dest_is_loop,
2494                     dest_is_priv, fam);
2495                 if (sifa == NULL)
2496                         continue;
2497                 atomic_add_int(&sifa->refcount, 1);
2498                 return (sifa);
2499         }
2500         if (resettotop == 0) {
2501                 inp->next_addr_touse = NULL;
2502                 goto once_again;
2503         }
2504         inp->next_addr_touse = starting_point;
2505         resettotop = 0;
2506 once_again_too:
2507         if (inp->next_addr_touse == NULL) {
2508                 inp->next_addr_touse = LIST_FIRST(&inp->sctp_addr_list);
2509                 resettotop = 1;
2510         }
2511         /* ok, what about an acceptable address in the inp */
2512         for (laddr = inp->next_addr_touse; laddr;
2513             laddr = LIST_NEXT(laddr, sctp_nxt_addr)) {
2514                 if (laddr->ifa == NULL) {
2515                         /* address has been removed */
2516                         continue;
2517                 }
2518                 if (laddr->action == SCTP_DEL_IP_ADDRESS) {
2519                         /* address is being deleted */
2520                         continue;
2521                 }
2522                 sifa = sctp_is_ifa_addr_acceptable(laddr->ifa, dest_is_loop,
2523                     dest_is_priv, fam);
2524                 if (sifa == NULL)
2525                         continue;
2526                 atomic_add_int(&sifa->refcount, 1);
2527                 return (sifa);
2528         }
2529         if (resettotop == 0) {
2530                 inp->next_addr_touse = NULL;
2531                 goto once_again_too;
2532         }
2533         /*
2534          * no address bound can be a source for the destination we are in
2535          * trouble
2536          */
2537         return (NULL);
2538 }
2539
2540
2541
2542 static struct sctp_ifa *
2543 sctp_choose_boundspecific_stcb(struct sctp_inpcb *inp,
2544     struct sctp_tcb *stcb,
2545     sctp_route_t * ro,
2546     uint32_t vrf_id,
2547     uint8_t dest_is_priv,
2548     uint8_t dest_is_loop,
2549     int non_asoc_addr_ok,
2550     sa_family_t fam)
2551 {
2552         struct sctp_laddr *laddr, *starting_point;
2553         void *ifn;
2554         struct sctp_ifn *sctp_ifn;
2555         struct sctp_ifa *sctp_ifa, *sifa;
2556         uint8_t start_at_beginning = 0;
2557         struct sctp_vrf *vrf;
2558         uint32_t ifn_index;
2559
2560         /*
2561          * first question, is the ifn we will emit on in our list, if so, we
2562          * want that one.
2563          */
2564         vrf = sctp_find_vrf(vrf_id);
2565         if (vrf == NULL)
2566                 return (NULL);
2567
2568         ifn = SCTP_GET_IFN_VOID_FROM_ROUTE(ro);
2569         ifn_index = SCTP_GET_IF_INDEX_FROM_ROUTE(ro);
2570         sctp_ifn = sctp_find_ifn(ifn, ifn_index);
2571
2572         /*
2573          * first question, is the ifn we will emit on in our list?  If so,
2574          * we want that one. First we look for a preferred. Second, we go
2575          * for an acceptable.
2576          */
2577         if (sctp_ifn) {
2578                 /* first try for a preferred address on the ep */
2579                 LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
2580                         if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) && (non_asoc_addr_ok == 0))
2581                                 continue;
2582                         if (sctp_is_addr_in_ep(inp, sctp_ifa)) {
2583                                 sifa = sctp_is_ifa_addr_preferred(sctp_ifa, dest_is_loop, dest_is_priv, fam);
2584                                 if (sifa == NULL)
2585                                         continue;
2586                                 if (((non_asoc_addr_ok == 0) &&
2587                                     (sctp_is_addr_restricted(stcb, sifa))) ||
2588                                     (non_asoc_addr_ok &&
2589                                     (sctp_is_addr_restricted(stcb, sifa)) &&
2590                                     (!sctp_is_addr_pending(stcb, sifa)))) {
2591                                         /* on the no-no list */
2592                                         continue;
2593                                 }
2594                                 atomic_add_int(&sifa->refcount, 1);
2595                                 return (sifa);
2596                         }
2597                 }
2598                 /* next try for an acceptable address on the ep */
2599                 LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
2600                         if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) && (non_asoc_addr_ok == 0))
2601                                 continue;
2602                         if (sctp_is_addr_in_ep(inp, sctp_ifa)) {
2603                                 sifa = sctp_is_ifa_addr_acceptable(sctp_ifa, dest_is_loop, dest_is_priv, fam);
2604                                 if (sifa == NULL)
2605                                         continue;
2606                                 if (((non_asoc_addr_ok == 0) &&
2607                                     (sctp_is_addr_restricted(stcb, sifa))) ||
2608                                     (non_asoc_addr_ok &&
2609                                     (sctp_is_addr_restricted(stcb, sifa)) &&
2610                                     (!sctp_is_addr_pending(stcb, sifa)))) {
2611                                         /* on the no-no list */
2612                                         continue;
2613                                 }
2614                                 atomic_add_int(&sifa->refcount, 1);
2615                                 return (sifa);
2616                         }
2617                 }
2618
2619         }
2620         /*
2621          * if we can't find one like that then we must look at all addresses
2622          * bound to pick one at first preferable then secondly acceptable.
2623          */
2624         starting_point = stcb->asoc.last_used_address;
2625 sctp_from_the_top:
2626         if (stcb->asoc.last_used_address == NULL) {
2627                 start_at_beginning = 1;
2628                 stcb->asoc.last_used_address = LIST_FIRST(&inp->sctp_addr_list);
2629         }
2630         /* search beginning with the last used address */
2631         for (laddr = stcb->asoc.last_used_address; laddr;
2632             laddr = LIST_NEXT(laddr, sctp_nxt_addr)) {
2633                 if (laddr->ifa == NULL) {
2634                         /* address has been removed */
2635                         continue;
2636                 }
2637                 if (laddr->action == SCTP_DEL_IP_ADDRESS) {
2638                         /* address is being deleted */
2639                         continue;
2640                 }
2641                 sifa = sctp_is_ifa_addr_preferred(laddr->ifa, dest_is_loop, dest_is_priv, fam);
2642                 if (sifa == NULL)
2643                         continue;
2644                 if (((non_asoc_addr_ok == 0) &&
2645                     (sctp_is_addr_restricted(stcb, sifa))) ||
2646                     (non_asoc_addr_ok &&
2647                     (sctp_is_addr_restricted(stcb, sifa)) &&
2648                     (!sctp_is_addr_pending(stcb, sifa)))) {
2649                         /* on the no-no list */
2650                         continue;
2651                 }
2652                 stcb->asoc.last_used_address = laddr;
2653                 atomic_add_int(&sifa->refcount, 1);
2654                 return (sifa);
2655         }
2656         if (start_at_beginning == 0) {
2657                 stcb->asoc.last_used_address = NULL;
2658                 goto sctp_from_the_top;
2659         }
2660         /* now try for any higher scope than the destination */
2661         stcb->asoc.last_used_address = starting_point;
2662         start_at_beginning = 0;
2663 sctp_from_the_top2:
2664         if (stcb->asoc.last_used_address == NULL) {
2665                 start_at_beginning = 1;
2666                 stcb->asoc.last_used_address = LIST_FIRST(&inp->sctp_addr_list);
2667         }
2668         /* search beginning with the last used address */
2669         for (laddr = stcb->asoc.last_used_address; laddr;
2670             laddr = LIST_NEXT(laddr, sctp_nxt_addr)) {
2671                 if (laddr->ifa == NULL) {
2672                         /* address has been removed */
2673                         continue;
2674                 }
2675                 if (laddr->action == SCTP_DEL_IP_ADDRESS) {
2676                         /* address is being deleted */
2677                         continue;
2678                 }
2679                 sifa = sctp_is_ifa_addr_acceptable(laddr->ifa, dest_is_loop,
2680                     dest_is_priv, fam);
2681                 if (sifa == NULL)
2682                         continue;
2683                 if (((non_asoc_addr_ok == 0) &&
2684                     (sctp_is_addr_restricted(stcb, sifa))) ||
2685                     (non_asoc_addr_ok &&
2686                     (sctp_is_addr_restricted(stcb, sifa)) &&
2687                     (!sctp_is_addr_pending(stcb, sifa)))) {
2688                         /* on the no-no list */
2689                         continue;
2690                 }
2691                 stcb->asoc.last_used_address = laddr;
2692                 atomic_add_int(&sifa->refcount, 1);
2693                 return (sifa);
2694         }
2695         if (start_at_beginning == 0) {
2696                 stcb->asoc.last_used_address = NULL;
2697                 goto sctp_from_the_top2;
2698         }
2699         return (NULL);
2700 }
2701
2702 static struct sctp_ifa *
2703 sctp_select_nth_preferred_addr_from_ifn_boundall(struct sctp_ifn *ifn,
2704     struct sctp_tcb *stcb,
2705     int non_asoc_addr_ok,
2706     uint8_t dest_is_loop,
2707     uint8_t dest_is_priv,
2708     int addr_wanted,
2709     sa_family_t fam,
2710     sctp_route_t * ro
2711 )
2712 {
2713         struct sctp_ifa *ifa, *sifa;
2714         int num_eligible_addr = 0;
2715
2716 #ifdef INET6
2717         struct sockaddr_in6 sin6, lsa6;
2718
2719         if (fam == AF_INET6) {
2720                 memcpy(&sin6, &ro->ro_dst, sizeof(struct sockaddr_in6));
2721                 (void)sa6_recoverscope(&sin6);
2722         }
2723 #endif                          /* INET6 */
2724         LIST_FOREACH(ifa, &ifn->ifalist, next_ifa) {
2725                 if ((ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
2726                     (non_asoc_addr_ok == 0))
2727                         continue;
2728                 sifa = sctp_is_ifa_addr_preferred(ifa, dest_is_loop,
2729                     dest_is_priv, fam);
2730                 if (sifa == NULL)
2731                         continue;
2732 #ifdef INET6
2733                 if (fam == AF_INET6 &&
2734                     dest_is_loop &&
2735                     sifa->src_is_loop && sifa->src_is_priv) {
2736                         /*
2737                          * don't allow fe80::1 to be a src on loop ::1, we
2738                          * don't list it to the peer so we will get an
2739                          * abort.
2740                          */
2741                         continue;
2742                 }
2743                 if (fam == AF_INET6 &&
2744                     IN6_IS_ADDR_LINKLOCAL(&sifa->address.sin6.sin6_addr) &&
2745                     IN6_IS_ADDR_LINKLOCAL(&sin6.sin6_addr)) {
2746                         /*
2747                          * link-local <-> link-local must belong to the same
2748                          * scope.
2749                          */
2750                         memcpy(&lsa6, &sifa->address.sin6, sizeof(struct sockaddr_in6));
2751                         (void)sa6_recoverscope(&lsa6);
2752                         if (sin6.sin6_scope_id != lsa6.sin6_scope_id) {
2753                                 continue;
2754                         }
2755                 }
2756 #endif                          /* INET6 */
2757
2758                 /*
2759                  * Check if the IPv6 address matches to next-hop. In the
2760                  * mobile case, old IPv6 address may be not deleted from the
2761                  * interface. Then, the interface has previous and new
2762                  * addresses.  We should use one corresponding to the
2763                  * next-hop.  (by micchie)
2764                  */
2765 #ifdef INET6
2766                 if (stcb && fam == AF_INET6 &&
2767                     sctp_is_mobility_feature_on(stcb->sctp_ep, SCTP_MOBILITY_BASE)) {
2768                         if (sctp_v6src_match_nexthop(&sifa->address.sin6, ro)
2769                             == 0) {
2770                                 continue;
2771                         }
2772                 }
2773 #endif
2774 #ifdef INET
2775                 /* Avoid topologically incorrect IPv4 address */
2776                 if (stcb && fam == AF_INET &&
2777                     sctp_is_mobility_feature_on(stcb->sctp_ep, SCTP_MOBILITY_BASE)) {
2778                         if (sctp_v4src_match_nexthop(sifa, ro) == 0) {
2779                                 continue;
2780                         }
2781                 }
2782 #endif
2783                 if (stcb) {
2784                         if (sctp_is_address_in_scope(ifa,
2785                             stcb->asoc.ipv4_addr_legal,
2786                             stcb->asoc.ipv6_addr_legal,
2787                             stcb->asoc.loopback_scope,
2788                             stcb->asoc.ipv4_local_scope,
2789                             stcb->asoc.local_scope,
2790                             stcb->asoc.site_scope, 0) == 0) {
2791                                 continue;
2792                         }
2793                         if (((non_asoc_addr_ok == 0) &&
2794                             (sctp_is_addr_restricted(stcb, sifa))) ||
2795                             (non_asoc_addr_ok &&
2796                             (sctp_is_addr_restricted(stcb, sifa)) &&
2797                             (!sctp_is_addr_pending(stcb, sifa)))) {
2798                                 /*
2799                                  * It is restricted for some reason..
2800                                  * probably not yet added.
2801                                  */
2802                                 continue;
2803                         }
2804                 }
2805                 if (num_eligible_addr >= addr_wanted) {
2806                         return (sifa);
2807                 }
2808                 num_eligible_addr++;
2809         }
2810         return (NULL);
2811 }
2812
2813
2814 static int
2815 sctp_count_num_preferred_boundall(struct sctp_ifn *ifn,
2816     struct sctp_tcb *stcb,
2817     int non_asoc_addr_ok,
2818     uint8_t dest_is_loop,
2819     uint8_t dest_is_priv,
2820     sa_family_t fam)
2821 {
2822         struct sctp_ifa *ifa, *sifa;
2823         int num_eligible_addr = 0;
2824
2825         LIST_FOREACH(ifa, &ifn->ifalist, next_ifa) {
2826                 if ((ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
2827                     (non_asoc_addr_ok == 0)) {
2828                         continue;
2829                 }
2830                 sifa = sctp_is_ifa_addr_preferred(ifa, dest_is_loop,
2831                     dest_is_priv, fam);
2832                 if (sifa == NULL) {
2833                         continue;
2834                 }
2835                 if (stcb) {
2836                         if (sctp_is_address_in_scope(ifa,
2837                             stcb->asoc.ipv4_addr_legal,
2838                             stcb->asoc.ipv6_addr_legal,
2839                             stcb->asoc.loopback_scope,
2840                             stcb->asoc.ipv4_local_scope,
2841                             stcb->asoc.local_scope,
2842                             stcb->asoc.site_scope, 0) == 0) {
2843                                 continue;
2844                         }
2845                         if (((non_asoc_addr_ok == 0) &&
2846                             (sctp_is_addr_restricted(stcb, sifa))) ||
2847                             (non_asoc_addr_ok &&
2848                             (sctp_is_addr_restricted(stcb, sifa)) &&
2849                             (!sctp_is_addr_pending(stcb, sifa)))) {
2850                                 /*
2851                                  * It is restricted for some reason..
2852                                  * probably not yet added.
2853                                  */
2854                                 continue;
2855                         }
2856                 }
2857                 num_eligible_addr++;
2858         }
2859         return (num_eligible_addr);
2860 }
2861
2862 static struct sctp_ifa *
2863 sctp_choose_boundall(struct sctp_tcb *stcb,
2864     struct sctp_nets *net,
2865     sctp_route_t * ro,
2866     uint32_t vrf_id,
2867     uint8_t dest_is_priv,
2868     uint8_t dest_is_loop,
2869     int non_asoc_addr_ok,
2870     sa_family_t fam)
2871 {
2872         int cur_addr_num = 0, num_preferred = 0;
2873         void *ifn;
2874         struct sctp_ifn *sctp_ifn, *looked_at = NULL, *emit_ifn;
2875         struct sctp_ifa *sctp_ifa, *sifa;
2876         uint32_t ifn_index;
2877         struct sctp_vrf *vrf;
2878
2879 #ifdef INET
2880         int retried = 0;
2881
2882 #endif
2883
2884         /*-
2885          * For boundall we can use any address in the association.
2886          * If non_asoc_addr_ok is set we can use any address (at least in
2887          * theory). So we look for preferred addresses first. If we find one,
2888          * we use it. Otherwise we next try to get an address on the
2889          * interface, which we should be able to do (unless non_asoc_addr_ok
2890          * is false and we are routed out that way). In these cases where we
2891          * can't use the address of the interface we go through all the
2892          * ifn's looking for an address we can use and fill that in. Punting
2893          * means we send back address 0, which will probably cause problems
2894          * actually since then IP will fill in the address of the route ifn,
2895          * which means we probably already rejected it.. i.e. here comes an
2896          * abort :-<.
2897          */
2898         vrf = sctp_find_vrf(vrf_id);
2899         if (vrf == NULL)
2900                 return (NULL);
2901
2902         ifn = SCTP_GET_IFN_VOID_FROM_ROUTE(ro);
2903         ifn_index = SCTP_GET_IF_INDEX_FROM_ROUTE(ro);
2904         SCTPDBG(SCTP_DEBUG_OUTPUT2, "ifn from route:%p ifn_index:%d\n", ifn, ifn_index);
2905         emit_ifn = looked_at = sctp_ifn = sctp_find_ifn(ifn, ifn_index);
2906         if (sctp_ifn == NULL) {
2907                 /* ?? We don't have this guy ?? */
2908                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "No ifn emit interface?\n");
2909                 goto bound_all_plan_b;
2910         }
2911         SCTPDBG(SCTP_DEBUG_OUTPUT2, "ifn_index:%d name:%s is emit interface\n",
2912             ifn_index, sctp_ifn->ifn_name);
2913
2914         if (net) {
2915                 cur_addr_num = net->indx_of_eligible_next_to_use;
2916         }
2917         num_preferred = sctp_count_num_preferred_boundall(sctp_ifn,
2918             stcb,
2919             non_asoc_addr_ok,
2920             dest_is_loop,
2921             dest_is_priv, fam);
2922         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Found %d preferred source addresses for intf:%s\n",
2923             num_preferred, sctp_ifn->ifn_name);
2924         if (num_preferred == 0) {
2925                 /*
2926                  * no eligible addresses, we must use some other interface
2927                  * address if we can find one.
2928                  */
2929                 goto bound_all_plan_b;
2930         }
2931         /*
2932          * Ok we have num_eligible_addr set with how many we can use, this
2933          * may vary from call to call due to addresses being deprecated
2934          * etc..
2935          */
2936         if (cur_addr_num >= num_preferred) {
2937                 cur_addr_num = 0;
2938         }
2939         /*
2940          * select the nth address from the list (where cur_addr_num is the
2941          * nth) and 0 is the first one, 1 is the second one etc...
2942          */
2943         SCTPDBG(SCTP_DEBUG_OUTPUT2, "cur_addr_num:%d\n", cur_addr_num);
2944
2945         sctp_ifa = sctp_select_nth_preferred_addr_from_ifn_boundall(sctp_ifn, stcb, non_asoc_addr_ok, dest_is_loop,
2946             dest_is_priv, cur_addr_num, fam, ro);
2947
2948         /* if sctp_ifa is NULL something changed??, fall to plan b. */
2949         if (sctp_ifa) {
2950                 atomic_add_int(&sctp_ifa->refcount, 1);
2951                 if (net) {
2952                         /* save off where the next one we will want */
2953                         net->indx_of_eligible_next_to_use = cur_addr_num + 1;
2954                 }
2955                 return (sctp_ifa);
2956         }
2957         /*
2958          * plan_b: Look at all interfaces and find a preferred address. If
2959          * no preferred fall through to plan_c.
2960          */
2961 bound_all_plan_b:
2962         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Trying Plan B\n");
2963         LIST_FOREACH(sctp_ifn, &vrf->ifnlist, next_ifn) {
2964                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "Examine interface %s\n",
2965                     sctp_ifn->ifn_name);
2966                 if (dest_is_loop == 0 && SCTP_IFN_IS_IFT_LOOP(sctp_ifn)) {
2967                         /* wrong base scope */
2968                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "skip\n");
2969                         continue;
2970                 }
2971                 if ((sctp_ifn == looked_at) && looked_at) {
2972                         /* already looked at this guy */
2973                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "already seen\n");
2974                         continue;
2975                 }
2976                 num_preferred = sctp_count_num_preferred_boundall(sctp_ifn, stcb, non_asoc_addr_ok,
2977                     dest_is_loop, dest_is_priv, fam);
2978                 SCTPDBG(SCTP_DEBUG_OUTPUT2,
2979                     "Found ifn:%p %d preferred source addresses\n",
2980                     ifn, num_preferred);
2981                 if (num_preferred == 0) {
2982                         /* None on this interface. */
2983                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "No prefered -- skipping to next\n");
2984                         continue;
2985                 }
2986                 SCTPDBG(SCTP_DEBUG_OUTPUT2,
2987                     "num preferred:%d on interface:%p cur_addr_num:%d\n",
2988                     num_preferred, sctp_ifn, cur_addr_num);
2989
2990                 /*
2991                  * Ok we have num_eligible_addr set with how many we can
2992                  * use, this may vary from call to call due to addresses
2993                  * being deprecated etc..
2994                  */
2995                 if (cur_addr_num >= num_preferred) {
2996                         cur_addr_num = 0;
2997                 }
2998                 sifa = sctp_select_nth_preferred_addr_from_ifn_boundall(sctp_ifn, stcb, non_asoc_addr_ok, dest_is_loop,
2999                     dest_is_priv, cur_addr_num, fam, ro);
3000                 if (sifa == NULL)
3001                         continue;
3002                 if (net) {
3003                         net->indx_of_eligible_next_to_use = cur_addr_num + 1;
3004                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "we selected %d\n",
3005                             cur_addr_num);
3006                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Source:");
3007                         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, &sifa->address.sa);
3008                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Dest:");
3009                         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, &net->ro._l_addr.sa);
3010                 }
3011                 atomic_add_int(&sifa->refcount, 1);
3012                 return (sifa);
3013         }
3014 #ifdef INET
3015 again_with_private_addresses_allowed:
3016 #endif
3017         /* plan_c: do we have an acceptable address on the emit interface */
3018         sifa = NULL;
3019         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Trying Plan C: find acceptable on interface\n");
3020         if (emit_ifn == NULL) {
3021                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "Jump to Plan D - no emit_ifn\n");
3022                 goto plan_d;
3023         }
3024         LIST_FOREACH(sctp_ifa, &emit_ifn->ifalist, next_ifa) {
3025                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "ifa:%p\n", sctp_ifa);
3026                 if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
3027                     (non_asoc_addr_ok == 0)) {
3028                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Defer\n");
3029                         continue;
3030                 }
3031                 sifa = sctp_is_ifa_addr_acceptable(sctp_ifa, dest_is_loop,
3032                     dest_is_priv, fam);
3033                 if (sifa == NULL) {
3034                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "IFA not acceptable\n");
3035                         continue;
3036                 }
3037                 if (stcb) {
3038                         if (sctp_is_address_in_scope(sifa,
3039                             stcb->asoc.ipv4_addr_legal,
3040                             stcb->asoc.ipv6_addr_legal,
3041                             stcb->asoc.loopback_scope,
3042                             stcb->asoc.ipv4_local_scope,
3043                             stcb->asoc.local_scope,
3044                             stcb->asoc.site_scope, 0) == 0) {
3045                                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "NOT in scope\n");
3046                                 sifa = NULL;
3047                                 continue;
3048                         }
3049                         if (((non_asoc_addr_ok == 0) &&
3050                             (sctp_is_addr_restricted(stcb, sifa))) ||
3051                             (non_asoc_addr_ok &&
3052                             (sctp_is_addr_restricted(stcb, sifa)) &&
3053                             (!sctp_is_addr_pending(stcb, sifa)))) {
3054                                 /*
3055                                  * It is restricted for some reason..
3056                                  * probably not yet added.
3057                                  */
3058                                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "Its resticted\n");
3059                                 sifa = NULL;
3060                                 continue;
3061                         }
3062                 } else {
3063                         SCTP_PRINTF("Stcb is null - no print\n");
3064                 }
3065                 atomic_add_int(&sifa->refcount, 1);
3066                 goto out;
3067         }
3068 plan_d:
3069         /*
3070          * plan_d: We are in trouble. No preferred address on the emit
3071          * interface. And not even a preferred address on all interfaces. Go
3072          * out and see if we can find an acceptable address somewhere
3073          * amongst all interfaces.
3074          */
3075         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Trying Plan D looked_at is %p\n", looked_at);
3076         LIST_FOREACH(sctp_ifn, &vrf->ifnlist, next_ifn) {
3077                 if (dest_is_loop == 0 && SCTP_IFN_IS_IFT_LOOP(sctp_ifn)) {
3078                         /* wrong base scope */
3079                         continue;
3080                 }
3081                 LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
3082                         if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
3083                             (non_asoc_addr_ok == 0))
3084                                 continue;
3085                         sifa = sctp_is_ifa_addr_acceptable(sctp_ifa,
3086                             dest_is_loop,
3087                             dest_is_priv, fam);
3088                         if (sifa == NULL)
3089                                 continue;
3090                         if (stcb) {
3091                                 if (sctp_is_address_in_scope(sifa,
3092                                     stcb->asoc.ipv4_addr_legal,
3093                                     stcb->asoc.ipv6_addr_legal,
3094                                     stcb->asoc.loopback_scope,
3095                                     stcb->asoc.ipv4_local_scope,
3096                                     stcb->asoc.local_scope,
3097                                     stcb->asoc.site_scope, 0) == 0) {
3098                                         sifa = NULL;
3099                                         continue;
3100                                 }
3101                                 if (((non_asoc_addr_ok == 0) &&
3102                                     (sctp_is_addr_restricted(stcb, sifa))) ||
3103                                     (non_asoc_addr_ok &&
3104                                     (sctp_is_addr_restricted(stcb, sifa)) &&
3105                                     (!sctp_is_addr_pending(stcb, sifa)))) {
3106                                         /*
3107                                          * It is restricted for some
3108                                          * reason.. probably not yet added.
3109                                          */
3110                                         sifa = NULL;
3111                                         continue;
3112                                 }
3113                         }
3114                         goto out;
3115                 }
3116         }
3117 #ifdef INET
3118         if ((retried == 0) && (stcb->asoc.ipv4_local_scope == 0)) {
3119                 stcb->asoc.ipv4_local_scope = 1;
3120                 retried = 1;
3121                 goto again_with_private_addresses_allowed;
3122         } else if (retried == 1) {
3123                 stcb->asoc.ipv4_local_scope = 0;
3124         }
3125 #endif
3126 out:
3127 #ifdef INET
3128         if (sifa) {
3129                 if (retried == 1) {
3130                         LIST_FOREACH(sctp_ifn, &vrf->ifnlist, next_ifn) {
3131                                 if (dest_is_loop == 0 && SCTP_IFN_IS_IFT_LOOP(sctp_ifn)) {
3132                                         /* wrong base scope */
3133                                         continue;
3134                                 }
3135                                 LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
3136                                         struct sctp_ifa *tmp_sifa;
3137
3138                                         if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
3139                                             (non_asoc_addr_ok == 0))
3140                                                 continue;
3141                                         tmp_sifa = sctp_is_ifa_addr_acceptable(sctp_ifa,
3142                                             dest_is_loop,
3143                                             dest_is_priv, fam);
3144                                         if (tmp_sifa == NULL) {
3145                                                 continue;
3146                                         }
3147                                         if (tmp_sifa == sifa) {
3148                                                 continue;
3149                                         }
3150                                         if (stcb) {
3151                                                 if (sctp_is_address_in_scope(tmp_sifa,
3152                                                     stcb->asoc.ipv4_addr_legal,
3153                                                     stcb->asoc.ipv6_addr_legal,
3154                                                     stcb->asoc.loopback_scope,
3155                                                     stcb->asoc.ipv4_local_scope,
3156                                                     stcb->asoc.local_scope,
3157                                                     stcb->asoc.site_scope, 0) == 0) {
3158                                                         continue;
3159                                                 }
3160                                                 if (((non_asoc_addr_ok == 0) &&
3161                                                     (sctp_is_addr_restricted(stcb, tmp_sifa))) ||
3162                                                     (non_asoc_addr_ok &&
3163                                                     (sctp_is_addr_restricted(stcb, tmp_sifa)) &&
3164                                                     (!sctp_is_addr_pending(stcb, tmp_sifa)))) {
3165                                                         /*
3166                                                          * It is restricted
3167                                                          * for some reason..
3168                                                          * probably not yet
3169                                                          * added.
3170                                                          */
3171                                                         continue;
3172                                                 }
3173                                         }
3174                                         if ((tmp_sifa->address.sin.sin_family == AF_INET) &&
3175                                             (IN4_ISPRIVATE_ADDRESS(&(tmp_sifa->address.sin.sin_addr)))) {
3176                                                 sctp_add_local_addr_restricted(stcb, tmp_sifa);
3177                                         }
3178                                 }
3179                         }
3180                 }
3181                 atomic_add_int(&sifa->refcount, 1);
3182         }
3183 #endif
3184         return (sifa);
3185 }
3186
3187
3188
3189 /* tcb may be NULL */
3190 struct sctp_ifa *
3191 sctp_source_address_selection(struct sctp_inpcb *inp,
3192     struct sctp_tcb *stcb,
3193     sctp_route_t * ro,
3194     struct sctp_nets *net,
3195     int non_asoc_addr_ok, uint32_t vrf_id)
3196 {
3197         struct sctp_ifa *answer;
3198         uint8_t dest_is_priv, dest_is_loop;
3199         sa_family_t fam;
3200
3201 #ifdef INET
3202         struct sockaddr_in *to = (struct sockaddr_in *)&ro->ro_dst;
3203
3204 #endif
3205 #ifdef INET6
3206         struct sockaddr_in6 *to6 = (struct sockaddr_in6 *)&ro->ro_dst;
3207
3208 #endif
3209
3210         /**
3211          * Rules: - Find the route if needed, cache if I can. - Look at
3212          * interface address in route, Is it in the bound list. If so we
3213          * have the best source. - If not we must rotate amongst the
3214          * addresses.
3215          *
3216          * Cavets and issues
3217          *
3218          * Do we need to pay attention to scope. We can have a private address
3219          * or a global address we are sourcing or sending to. So if we draw
3220          * it out
3221          * zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz
3222          * For V4
3223          * ------------------------------------------
3224          *      source     *      dest  *  result
3225          * -----------------------------------------
3226          * <a>  Private    *    Global  *  NAT
3227          * -----------------------------------------
3228          * <b>  Private    *    Private *  No problem
3229          * -----------------------------------------
3230          * <c>  Global     *    Private *  Huh, How will this work?
3231          * -----------------------------------------
3232          * <d>  Global     *    Global  *  No Problem
3233          *------------------------------------------
3234          * zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz
3235          * For V6
3236          *------------------------------------------
3237          *      source     *      dest  *  result
3238          * -----------------------------------------
3239          * <a>  Linklocal  *    Global  *
3240          * -----------------------------------------
3241          * <b>  Linklocal  * Linklocal  *  No problem
3242          * -----------------------------------------
3243          * <c>  Global     * Linklocal  *  Huh, How will this work?
3244          * -----------------------------------------
3245          * <d>  Global     *    Global  *  No Problem
3246          *------------------------------------------
3247          * zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz
3248          *
3249          * And then we add to that what happens if there are multiple addresses
3250          * assigned to an interface. Remember the ifa on a ifn is a linked
3251          * list of addresses. So one interface can have more than one IP
3252          * address. What happens if we have both a private and a global
3253          * address? Do we then use context of destination to sort out which
3254          * one is best? And what about NAT's sending P->G may get you a NAT
3255          * translation, or should you select the G thats on the interface in
3256          * preference.
3257          *
3258          * Decisions:
3259          *
3260          * - count the number of addresses on the interface.
3261          * - if it is one, no problem except case <c>.
3262          *   For <a> we will assume a NAT out there.
3263          * - if there are more than one, then we need to worry about scope P
3264          *   or G. We should prefer G -> G and P -> P if possible.
3265          *   Then as a secondary fall back to mixed types G->P being a last
3266          *   ditch one.
3267          * - The above all works for bound all, but bound specific we need to
3268          *   use the same concept but instead only consider the bound
3269          *   addresses. If the bound set is NOT assigned to the interface then
3270          *   we must use rotation amongst the bound addresses..
3271          */
3272         if (ro->ro_rt == NULL) {
3273                 /*
3274                  * Need a route to cache.
3275                  */
3276                 SCTP_RTALLOC(ro, vrf_id);
3277         }
3278         if (ro->ro_rt == NULL) {
3279                 return (NULL);
3280         }
3281         fam = ro->ro_dst.sa_family;
3282         dest_is_priv = dest_is_loop = 0;
3283         /* Setup our scopes for the destination */
3284         switch (fam) {
3285 #ifdef INET
3286         case AF_INET:
3287                 /* Scope based on outbound address */
3288                 if (IN4_ISLOOPBACK_ADDRESS(&to->sin_addr)) {
3289                         dest_is_loop = 1;
3290                         if (net != NULL) {
3291                                 /* mark it as local */
3292                                 net->addr_is_local = 1;
3293                         }
3294                 } else if ((IN4_ISPRIVATE_ADDRESS(&to->sin_addr))) {
3295                         dest_is_priv = 1;
3296                 }
3297                 break;
3298 #endif
3299 #ifdef INET6
3300         case AF_INET6:
3301                 /* Scope based on outbound address */
3302                 if (IN6_IS_ADDR_LOOPBACK(&to6->sin6_addr) ||
3303                     SCTP_ROUTE_IS_REAL_LOOP(ro)) {
3304                         /*
3305                          * If the address is a loopback address, which
3306                          * consists of "::1" OR "fe80::1%lo0", we are
3307                          * loopback scope. But we don't use dest_is_priv
3308                          * (link local addresses).
3309                          */
3310                         dest_is_loop = 1;
3311                         if (net != NULL) {
3312                                 /* mark it as local */
3313                                 net->addr_is_local = 1;
3314                         }
3315                 } else if (IN6_IS_ADDR_LINKLOCAL(&to6->sin6_addr)) {
3316                         dest_is_priv = 1;
3317                 }
3318                 break;
3319 #endif
3320         }
3321         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Select source addr for:");
3322         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)&ro->ro_dst);
3323         SCTP_IPI_ADDR_RLOCK();
3324         if (inp->sctp_flags & SCTP_PCB_FLAGS_BOUNDALL) {
3325                 /*
3326                  * Bound all case
3327                  */
3328                 answer = sctp_choose_boundall(stcb, net, ro, vrf_id,
3329                     dest_is_priv, dest_is_loop,
3330                     non_asoc_addr_ok, fam);
3331                 SCTP_IPI_ADDR_RUNLOCK();
3332                 return (answer);
3333         }
3334         /*
3335          * Subset bound case
3336          */
3337         if (stcb) {
3338                 answer = sctp_choose_boundspecific_stcb(inp, stcb, ro,
3339                     vrf_id, dest_is_priv,
3340                     dest_is_loop,
3341                     non_asoc_addr_ok, fam);
3342         } else {
3343                 answer = sctp_choose_boundspecific_inp(inp, ro, vrf_id,
3344                     non_asoc_addr_ok,
3345                     dest_is_priv,
3346                     dest_is_loop, fam);
3347         }
3348         SCTP_IPI_ADDR_RUNLOCK();
3349         return (answer);
3350 }
3351
3352 static int
3353 sctp_find_cmsg(int c_type, void *data, struct mbuf *control, size_t cpsize)
3354 {
3355         struct cmsghdr cmh;
3356         int tlen, at, found;
3357         struct sctp_sndinfo sndinfo;
3358         struct sctp_prinfo prinfo;
3359         struct sctp_authinfo authinfo;
3360
3361         tlen = SCTP_BUF_LEN(control);
3362         at = 0;
3363         found = 0;
3364         /*
3365          * Independent of how many mbufs, find the c_type inside the control
3366          * structure and copy out the data.
3367          */
3368         while (at < tlen) {
3369                 if ((tlen - at) < (int)CMSG_ALIGN(sizeof(cmh))) {
3370                         /* There is not enough room for one more. */
3371                         return (found);
3372                 }
3373                 m_copydata(control, at, sizeof(cmh), (caddr_t)&cmh);
3374                 if (cmh.cmsg_len < CMSG_ALIGN(sizeof(struct cmsghdr))) {
3375                         /* We dont't have a complete CMSG header. */
3376                         return (found);
3377                 }
3378                 if (((int)cmh.cmsg_len + at) > tlen) {
3379                         /* We don't have the complete CMSG. */
3380                         return (found);
3381                 }
3382                 if ((cmh.cmsg_level == IPPROTO_SCTP) &&
3383                     ((c_type == cmh.cmsg_type) ||
3384                     ((c_type == SCTP_SNDRCV) &&
3385                     ((cmh.cmsg_type == SCTP_SNDINFO) ||
3386                     (cmh.cmsg_type == SCTP_PRINFO) ||
3387                     (cmh.cmsg_type == SCTP_AUTHINFO))))) {
3388                         if (c_type == cmh.cmsg_type) {
3389                                 if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(struct cmsghdr))) < cpsize) {
3390                                         return (found);
3391                                 }
3392                                 /* It is exactly what we want. Copy it out. */
3393                                 m_copydata(control, at + CMSG_ALIGN(sizeof(struct cmsghdr)), cpsize, (caddr_t)data);
3394                                 return (1);
3395                         } else {
3396                                 struct sctp_sndrcvinfo *sndrcvinfo;
3397
3398                                 sndrcvinfo = (struct sctp_sndrcvinfo *)data;
3399                                 if (found == 0) {
3400                                         if (cpsize < sizeof(struct sctp_sndrcvinfo)) {
3401                                                 return (found);
3402                                         }
3403                                         memset(sndrcvinfo, 0, sizeof(struct sctp_sndrcvinfo));
3404                                 }
3405                                 switch (cmh.cmsg_type) {
3406                                 case SCTP_SNDINFO:
3407                                         if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(struct cmsghdr))) < sizeof(struct sctp_sndinfo)) {
3408                                                 return (found);
3409                                         }
3410                                         m_copydata(control, at + CMSG_ALIGN(sizeof(struct cmsghdr)), sizeof(struct sctp_sndinfo), (caddr_t)&sndinfo);
3411                                         sndrcvinfo->sinfo_stream = sndinfo.snd_sid;
3412                                         sndrcvinfo->sinfo_flags = sndinfo.snd_flags;
3413                                         sndrcvinfo->sinfo_ppid = sndinfo.snd_ppid;
3414                                         sndrcvinfo->sinfo_context = sndinfo.snd_context;
3415                                         sndrcvinfo->sinfo_assoc_id = sndinfo.snd_assoc_id;
3416                                         break;
3417                                 case SCTP_PRINFO:
3418                                         if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(struct cmsghdr))) < sizeof(struct sctp_prinfo)) {
3419                                                 return (found);
3420                                         }
3421                                         m_copydata(control, at + CMSG_ALIGN(sizeof(struct cmsghdr)), sizeof(struct sctp_prinfo), (caddr_t)&prinfo);
3422                                         sndrcvinfo->sinfo_timetolive = prinfo.pr_value;
3423                                         sndrcvinfo->sinfo_flags |= prinfo.pr_policy;
3424                                         break;
3425                                 case SCTP_AUTHINFO:
3426                                         if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(struct cmsghdr))) < sizeof(struct sctp_authinfo)) {
3427                                                 return (found);
3428                                         }
3429                                         m_copydata(control, at + CMSG_ALIGN(sizeof(struct cmsghdr)), sizeof(struct sctp_authinfo), (caddr_t)&authinfo);
3430                                         sndrcvinfo->sinfo_keynumber_valid = 1;
3431                                         sndrcvinfo->sinfo_keynumber = authinfo.auth_keynumber;
3432                                         break;
3433                                 default:
3434                                         return (found);
3435                                 }
3436                                 found = 1;
3437                         }
3438                 }
3439                 at += CMSG_ALIGN(cmh.cmsg_len);
3440         }
3441         return (found);
3442 }
3443
3444 static int
3445 sctp_process_cmsgs_for_init(struct sctp_tcb *stcb, struct mbuf *control, int *error)
3446 {
3447         struct cmsghdr cmh;
3448         int tlen, at;
3449         struct sctp_initmsg initmsg;
3450
3451 #ifdef INET
3452         struct sockaddr_in sin;
3453
3454 #endif
3455 #ifdef INET6
3456         struct sockaddr_in6 sin6;
3457
3458 #endif
3459
3460         tlen = SCTP_BUF_LEN(control);
3461         at = 0;
3462         while (at < tlen) {
3463                 if ((tlen - at) < (int)CMSG_ALIGN(sizeof(cmh))) {
3464                         /* There is not enough room for one more. */
3465                         *error = EINVAL;
3466                         return (1);
3467                 }
3468                 m_copydata(control, at, sizeof(cmh), (caddr_t)&cmh);
3469                 if (cmh.cmsg_len < CMSG_ALIGN(sizeof(struct cmsghdr))) {
3470                         /* We dont't have a complete CMSG header. */
3471                         *error = EINVAL;
3472                         return (1);
3473                 }
3474                 if (((int)cmh.cmsg_len + at) > tlen) {
3475                         /* We don't have the complete CMSG. */
3476                         *error = EINVAL;
3477                         return (1);
3478                 }
3479                 if (cmh.cmsg_level == IPPROTO_SCTP) {
3480                         switch (cmh.cmsg_type) {
3481                         case SCTP_INIT:
3482                                 if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(struct cmsghdr))) < sizeof(struct sctp_initmsg)) {
3483                                         *error = EINVAL;
3484                                         return (1);
3485                                 }
3486                                 m_copydata(control, at + CMSG_ALIGN(sizeof(struct cmsghdr)), sizeof(struct sctp_initmsg), (caddr_t)&initmsg);
3487                                 if (initmsg.sinit_max_attempts)
3488                                         stcb->asoc.max_init_times = initmsg.sinit_max_attempts;
3489                                 if (initmsg.sinit_num_ostreams)
3490                                         stcb->asoc.pre_open_streams = initmsg.sinit_num_ostreams;
3491                                 if (initmsg.sinit_max_instreams)
3492                                         stcb->asoc.max_inbound_streams = initmsg.sinit_max_instreams;
3493                                 if (initmsg.sinit_max_init_timeo)
3494                                         stcb->asoc.initial_init_rto_max = initmsg.sinit_max_init_timeo;
3495                                 if (stcb->asoc.streamoutcnt < stcb->asoc.pre_open_streams) {
3496                                         struct sctp_stream_out *tmp_str;
3497                                         unsigned int i;
3498
3499                                         /* Default is NOT correct */
3500                                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Ok, default:%d pre_open:%d\n",
3501                                             stcb->asoc.streamoutcnt, stcb->asoc.pre_open_streams);
3502                                         SCTP_TCB_UNLOCK(stcb);
3503                                         SCTP_MALLOC(tmp_str,
3504                                             struct sctp_stream_out *,
3505                                             (stcb->asoc.pre_open_streams * sizeof(struct sctp_stream_out)),
3506                                             SCTP_M_STRMO);
3507                                         SCTP_TCB_LOCK(stcb);
3508                                         if (tmp_str != NULL) {
3509                                                 SCTP_FREE(stcb->asoc.strmout, SCTP_M_STRMO);
3510                                                 stcb->asoc.strmout = tmp_str;
3511                                                 stcb->asoc.strm_realoutsize = stcb->asoc.streamoutcnt = stcb->asoc.pre_open_streams;
3512                                         } else {
3513                                                 stcb->asoc.pre_open_streams = stcb->asoc.streamoutcnt;
3514                                         }
3515                                         for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
3516                                                 stcb->asoc.strmout[i].next_sequence_sent = 0;
3517                                                 TAILQ_INIT(&stcb->asoc.strmout[i].outqueue);
3518                                                 stcb->asoc.strmout[i].stream_no = i;
3519                                                 stcb->asoc.strmout[i].last_msg_incomplete = 0;
3520                                                 stcb->asoc.ss_functions.sctp_ss_init_stream(&stcb->asoc.strmout[i], NULL);
3521                                         }
3522                                 }
3523                                 break;
3524 #ifdef INET
3525                         case SCTP_DSTADDRV4:
3526                                 if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(struct cmsghdr))) < sizeof(struct in_addr)) {
3527                                         *error = EINVAL;
3528                                         return (1);
3529                                 }
3530                                 memset(&sin, 0, sizeof(struct sockaddr_in));
3531                                 sin.sin_family = AF_INET;
3532                                 sin.sin_len = sizeof(struct sockaddr_in);
3533                                 sin.sin_port = stcb->rport;
3534                                 m_copydata(control, at + CMSG_ALIGN(sizeof(struct cmsghdr)), sizeof(struct in_addr), (caddr_t)&sin.sin_addr);
3535                                 if ((sin.sin_addr.s_addr == INADDR_ANY) ||
3536                                     (sin.sin_addr.s_addr == INADDR_BROADCAST) ||
3537                                     IN_MULTICAST(ntohl(sin.sin_addr.s_addr))) {
3538                                         *error = EINVAL;
3539                                         return (1);
3540                                 }
3541                                 if (sctp_add_remote_addr(stcb, (struct sockaddr *)&sin, NULL,
3542                                     SCTP_DONOT_SETSCOPE, SCTP_ADDR_IS_CONFIRMED)) {
3543                                         *error = ENOBUFS;
3544                                         return (1);
3545                                 }
3546                                 break;
3547 #endif
3548 #ifdef INET6
3549                         case SCTP_DSTADDRV6:
3550                                 if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(struct cmsghdr))) < sizeof(struct in6_addr)) {
3551                                         *error = EINVAL;
3552                                         return (1);
3553                                 }
3554                                 memset(&sin6, 0, sizeof(struct sockaddr_in6));
3555                                 sin6.sin6_family = AF_INET6;
3556                                 sin6.sin6_len = sizeof(struct sockaddr_in6);
3557                                 sin6.sin6_port = stcb->rport;
3558                                 m_copydata(control, at + CMSG_ALIGN(sizeof(struct cmsghdr)), sizeof(struct in6_addr), (caddr_t)&sin6.sin6_addr);
3559                                 if (IN6_IS_ADDR_UNSPECIFIED(&sin6.sin6_addr) ||
3560                                     IN6_IS_ADDR_MULTICAST(&sin6.sin6_addr)) {
3561                                         *error = EINVAL;
3562                                         return (1);
3563                                 }
3564 #ifdef INET
3565                                 if (IN6_IS_ADDR_V4MAPPED(&sin6.sin6_addr)) {
3566                                         in6_sin6_2_sin(&sin, &sin6);
3567                                         if ((sin.sin_addr.s_addr == INADDR_ANY) ||
3568                                             (sin.sin_addr.s_addr == INADDR_BROADCAST) ||
3569                                             IN_MULTICAST(ntohl(sin.sin_addr.s_addr))) {
3570                                                 *error = EINVAL;
3571                                                 return (1);
3572                                         }
3573                                         if (sctp_add_remote_addr(stcb, (struct sockaddr *)&sin, NULL,
3574                                             SCTP_DONOT_SETSCOPE, SCTP_ADDR_IS_CONFIRMED)) {
3575                                                 *error = ENOBUFS;
3576                                                 return (1);
3577                                         }
3578                                 } else
3579 #endif
3580                                         if (sctp_add_remote_addr(stcb, (struct sockaddr *)&sin6, NULL,
3581                                     SCTP_DONOT_SETSCOPE, SCTP_ADDR_IS_CONFIRMED)) {
3582                                         *error = ENOBUFS;
3583                                         return (1);
3584                                 }
3585                                 break;
3586 #endif
3587                         default:
3588                                 break;
3589                         }
3590                 }
3591                 at += CMSG_ALIGN(cmh.cmsg_len);
3592         }
3593         return (0);
3594 }
3595
3596 static struct sctp_tcb *
3597 sctp_findassociation_cmsgs(struct sctp_inpcb **inp_p,
3598     in_port_t port,
3599     struct mbuf *control,
3600     struct sctp_nets **net_p,
3601     int *error)
3602 {
3603         struct cmsghdr cmh;
3604         int tlen, at;
3605         struct sctp_tcb *stcb;
3606         struct sockaddr *addr;
3607
3608 #ifdef INET
3609         struct sockaddr_in sin;
3610
3611 #endif
3612 #ifdef INET6
3613         struct sockaddr_in6 sin6;
3614
3615 #endif
3616
3617         tlen = SCTP_BUF_LEN(control);
3618         at = 0;
3619         while (at < tlen) {
3620                 if ((tlen - at) < (int)CMSG_ALIGN(sizeof(cmh))) {
3621                         /* There is not enough room for one more. */
3622                         *error = EINVAL;
3623                         return (NULL);
3624                 }
3625                 m_copydata(control, at, sizeof(cmh), (caddr_t)&cmh);
3626                 if (cmh.cmsg_len < CMSG_ALIGN(sizeof(struct cmsghdr))) {
3627                         /* We dont't have a complete CMSG header. */
3628                         *error = EINVAL;
3629                         return (NULL);
3630                 }
3631                 if (((int)cmh.cmsg_len + at) > tlen) {
3632                         /* We don't have the complete CMSG. */
3633                         *error = EINVAL;
3634                         return (NULL);
3635                 }
3636                 if (cmh.cmsg_level == IPPROTO_SCTP) {
3637                         switch (cmh.cmsg_type) {
3638 #ifdef INET
3639                         case SCTP_DSTADDRV4:
3640                                 if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(struct cmsghdr))) < sizeof(struct in_addr)) {
3641                                         *error = EINVAL;
3642                                         return (NULL);
3643                                 }
3644                                 memset(&sin, 0, sizeof(struct sockaddr_in));
3645                                 sin.sin_family = AF_INET;
3646                                 sin.sin_len = sizeof(struct sockaddr_in);
3647                                 sin.sin_port = port;
3648                                 m_copydata(control, at + CMSG_ALIGN(sizeof(struct cmsghdr)), sizeof(struct in_addr), (caddr_t)&sin.sin_addr);
3649                                 addr = (struct sockaddr *)&sin;
3650                                 break;
3651 #endif
3652 #ifdef INET6
3653                         case SCTP_DSTADDRV6:
3654                                 if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(struct cmsghdr))) < sizeof(struct in6_addr)) {
3655                                         *error = EINVAL;
3656                                         return (NULL);
3657                                 }
3658                                 memset(&sin6, 0, sizeof(struct sockaddr_in6));
3659                                 sin6.sin6_family = AF_INET6;
3660                                 sin6.sin6_len = sizeof(struct sockaddr_in6);
3661                                 sin6.sin6_port = port;
3662                                 m_copydata(control, at + CMSG_ALIGN(sizeof(struct cmsghdr)), sizeof(struct in6_addr), (caddr_t)&sin6.sin6_addr);
3663 #ifdef INET
3664                                 if (IN6_IS_ADDR_V4MAPPED(&sin6.sin6_addr)) {
3665                                         in6_sin6_2_sin(&sin, &sin6);
3666                                         addr = (struct sockaddr *)&sin;
3667                                 } else
3668 #endif
3669                                         addr = (struct sockaddr *)&sin6;
3670                                 break;
3671 #endif
3672                         default:
3673                                 addr = NULL;
3674                                 break;
3675                         }
3676                         if (addr) {
3677                                 stcb = sctp_findassociation_ep_addr(inp_p, addr, net_p, NULL, NULL);
3678                                 if (stcb != NULL) {
3679                                         return (stcb);
3680                                 }
3681                         }
3682                 }
3683                 at += CMSG_ALIGN(cmh.cmsg_len);
3684         }
3685         return (NULL);
3686 }
3687
3688 static struct mbuf *
3689 sctp_add_cookie(struct mbuf *init, int init_offset,
3690     struct mbuf *initack, int initack_offset, struct sctp_state_cookie *stc_in, uint8_t ** signature)
3691 {
3692         struct mbuf *copy_init, *copy_initack, *m_at, *sig, *mret;
3693         struct sctp_state_cookie *stc;
3694         struct sctp_paramhdr *ph;
3695         uint8_t *foo;
3696         int sig_offset;
3697         uint16_t cookie_sz;
3698
3699         mret = NULL;
3700         mret = sctp_get_mbuf_for_msg((sizeof(struct sctp_state_cookie) +
3701             sizeof(struct sctp_paramhdr)), 0,
3702             M_DONTWAIT, 1, MT_DATA);
3703         if (mret == NULL) {
3704                 return (NULL);
3705         }
3706         copy_init = SCTP_M_COPYM(init, init_offset, M_COPYALL, M_DONTWAIT);
3707         if (copy_init == NULL) {
3708                 sctp_m_freem(mret);
3709                 return (NULL);
3710         }
3711 #ifdef SCTP_MBUF_LOGGING
3712         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
3713                 struct mbuf *mat;
3714
3715                 for (mat = copy_init; mat; mat = SCTP_BUF_NEXT(mat)) {
3716                         if (SCTP_BUF_IS_EXTENDED(mat)) {
3717                                 sctp_log_mb(mat, SCTP_MBUF_ICOPY);
3718                         }
3719                 }
3720         }
3721 #endif
3722         copy_initack = SCTP_M_COPYM(initack, initack_offset, M_COPYALL,
3723             M_DONTWAIT);
3724         if (copy_initack == NULL) {
3725                 sctp_m_freem(mret);
3726                 sctp_m_freem(copy_init);
3727                 return (NULL);
3728         }
3729 #ifdef SCTP_MBUF_LOGGING
3730         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
3731                 struct mbuf *mat;
3732
3733                 for (mat = copy_initack; mat; mat = SCTP_BUF_NEXT(mat)) {
3734                         if (SCTP_BUF_IS_EXTENDED(mat)) {
3735                                 sctp_log_mb(mat, SCTP_MBUF_ICOPY);
3736                         }
3737                 }
3738         }
3739 #endif
3740         /* easy side we just drop it on the end */
3741         ph = mtod(mret, struct sctp_paramhdr *);
3742         SCTP_BUF_LEN(mret) = sizeof(struct sctp_state_cookie) +
3743             sizeof(struct sctp_paramhdr);
3744         stc = (struct sctp_state_cookie *)((caddr_t)ph +
3745             sizeof(struct sctp_paramhdr));
3746         ph->param_type = htons(SCTP_STATE_COOKIE);
3747         ph->param_length = 0;   /* fill in at the end */
3748         /* Fill in the stc cookie data */
3749         memcpy(stc, stc_in, sizeof(struct sctp_state_cookie));
3750
3751         /* tack the INIT and then the INIT-ACK onto the chain */
3752         cookie_sz = 0;
3753         for (m_at = mret; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
3754                 cookie_sz += SCTP_BUF_LEN(m_at);
3755                 if (SCTP_BUF_NEXT(m_at) == NULL) {
3756                         SCTP_BUF_NEXT(m_at) = copy_init;
3757                         break;
3758                 }
3759         }
3760         for (m_at = copy_init; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
3761                 cookie_sz += SCTP_BUF_LEN(m_at);
3762                 if (SCTP_BUF_NEXT(m_at) == NULL) {
3763                         SCTP_BUF_NEXT(m_at) = copy_initack;
3764                         break;
3765                 }
3766         }
3767         for (m_at = copy_initack; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
3768                 cookie_sz += SCTP_BUF_LEN(m_at);
3769                 if (SCTP_BUF_NEXT(m_at) == NULL) {
3770                         break;
3771                 }
3772         }
3773         sig = sctp_get_mbuf_for_msg(SCTP_SECRET_SIZE, 0, M_DONTWAIT, 1, MT_DATA);
3774         if (sig == NULL) {
3775                 /* no space, so free the entire chain */
3776                 sctp_m_freem(mret);
3777                 return (NULL);
3778         }
3779         SCTP_BUF_LEN(sig) = 0;
3780         SCTP_BUF_NEXT(m_at) = sig;
3781         sig_offset = 0;
3782         foo = (uint8_t *) (mtod(sig, caddr_t)+sig_offset);
3783         memset(foo, 0, SCTP_SIGNATURE_SIZE);
3784         *signature = foo;
3785         SCTP_BUF_LEN(sig) += SCTP_SIGNATURE_SIZE;
3786         cookie_sz += SCTP_SIGNATURE_SIZE;
3787         ph->param_length = htons(cookie_sz);
3788         return (mret);
3789 }
3790
3791
3792 static uint8_t
3793 sctp_get_ect(struct sctp_tcb *stcb)
3794 {
3795         if ((stcb != NULL) && (stcb->asoc.ecn_allowed == 1)) {
3796                 return (SCTP_ECT0_BIT);
3797         } else {
3798                 return (0);
3799         }
3800 }
3801
3802 static void
3803 sctp_handle_no_route(struct sctp_tcb *stcb,
3804     struct sctp_nets *net,
3805     int so_locked)
3806 {
3807         SCTPDBG(SCTP_DEBUG_OUTPUT1, "dropped packet - no valid source addr\n");
3808
3809         if (net) {
3810                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Destination was ");
3811                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT1, &net->ro._l_addr.sa);
3812                 if (net->dest_state & SCTP_ADDR_CONFIRMED) {
3813                         if ((net->dest_state & SCTP_ADDR_REACHABLE) && stcb) {
3814                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "no route takes interface %p down\n", net);
3815                                 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_DOWN,
3816                                     stcb, 0,
3817                                     (void *)net,
3818                                     so_locked);
3819                                 net->dest_state &= ~SCTP_ADDR_REACHABLE;
3820                                 net->dest_state &= ~SCTP_ADDR_PF;
3821                         }
3822                 }
3823                 if (stcb) {
3824                         if (net == stcb->asoc.primary_destination) {
3825                                 /* need a new primary */
3826                                 struct sctp_nets *alt;
3827
3828                                 alt = sctp_find_alternate_net(stcb, net, 0);
3829                                 if (alt != net) {
3830                                         if (stcb->asoc.alternate) {
3831                                                 sctp_free_remote_addr(stcb->asoc.alternate);
3832                                         }
3833                                         stcb->asoc.alternate = alt;
3834                                         atomic_add_int(&stcb->asoc.alternate->ref_count, 1);
3835                                         if (net->ro._s_addr) {
3836                                                 sctp_free_ifa(net->ro._s_addr);
3837                                                 net->ro._s_addr = NULL;
3838                                         }
3839                                         net->src_addr_selected = 0;
3840                                 }
3841                         }
3842                 }
3843         }
3844 }
3845
3846 static int
3847 sctp_lowlevel_chunk_output(struct sctp_inpcb *inp,
3848     struct sctp_tcb *stcb,      /* may be NULL */
3849     struct sctp_nets *net,
3850     struct sockaddr *to,
3851     struct mbuf *m,
3852     uint32_t auth_offset,
3853     struct sctp_auth_chunk *auth,
3854     uint16_t auth_keyid,
3855     int nofragment_flag,
3856     int ecn_ok,
3857     int out_of_asoc_ok,
3858     uint16_t src_port,
3859     uint16_t dest_port,
3860     uint32_t v_tag,
3861     uint16_t port,
3862     union sctp_sockstore *over_addr,
3863     uint8_t use_mflowid, uint32_t mflowid,
3864 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
3865     int so_locked SCTP_UNUSED
3866 #else
3867     int so_locked
3868 #endif
3869 )
3870 /* nofragment_flag to tell if IP_DF should be set (IPv4 only) */
3871 {
3872         /**
3873          * Given a mbuf chain (via SCTP_BUF_NEXT()) that holds a packet header
3874          * WITH an SCTPHDR but no IP header, endpoint inp and sa structure:
3875          * - fill in the HMAC digest of any AUTH chunk in the packet.
3876          * - calculate and fill in the SCTP checksum.
3877          * - prepend an IP address header.
3878          * - if boundall use INADDR_ANY.
3879          * - if boundspecific do source address selection.
3880          * - set fragmentation option for ipV4.
3881          * - On return from IP output, check/adjust mtu size of output
3882          *   interface and smallest_mtu size as well.
3883          */
3884         /* Will need ifdefs around this */
3885         struct mbuf *o_pak;
3886         struct mbuf *newm;
3887         struct sctphdr *sctphdr;
3888         int packet_length;
3889         int ret;
3890         uint32_t vrf_id;
3891         sctp_route_t *ro = NULL;
3892         struct udphdr *udp = NULL;
3893         uint8_t tos_value;
3894
3895 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
3896         struct socket *so = NULL;
3897
3898 #endif
3899
3900         if ((net) && (net->dest_state & SCTP_ADDR_OUT_OF_SCOPE)) {
3901                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EFAULT);
3902                 sctp_m_freem(m);
3903                 return (EFAULT);
3904         }
3905         if (stcb) {
3906                 vrf_id = stcb->asoc.vrf_id;
3907         } else {
3908                 vrf_id = inp->def_vrf_id;
3909         }
3910
3911         /* fill in the HMAC digest for any AUTH chunk in the packet */
3912         if ((auth != NULL) && (stcb != NULL)) {
3913                 sctp_fill_hmac_digest_m(m, auth_offset, auth, stcb, auth_keyid);
3914         }
3915         if (net) {
3916                 tos_value = net->dscp;
3917         } else if (stcb) {
3918                 tos_value = stcb->asoc.default_dscp;
3919         } else {
3920                 tos_value = inp->sctp_ep.default_dscp;
3921         }
3922
3923         switch (to->sa_family) {
3924 #ifdef INET
3925         case AF_INET:
3926                 {
3927                         struct ip *ip = NULL;
3928                         sctp_route_t iproute;
3929                         int len;
3930
3931                         len = sizeof(struct ip) + sizeof(struct sctphdr);
3932                         if (port) {
3933                                 len += sizeof(struct udphdr);
3934                         }
3935                         newm = sctp_get_mbuf_for_msg(len, 1, M_DONTWAIT, 1, MT_DATA);
3936                         if (newm == NULL) {
3937                                 sctp_m_freem(m);
3938                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
3939                                 return (ENOMEM);
3940                         }
3941                         SCTP_ALIGN_TO_END(newm, len);
3942                         SCTP_BUF_LEN(newm) = len;
3943                         SCTP_BUF_NEXT(newm) = m;
3944                         m = newm;
3945                         if (net != NULL) {
3946 #ifdef INVARIANTS
3947                                 if (net->flowidset == 0) {
3948                                         panic("Flow ID not set");
3949                                 }
3950 #endif
3951                                 m->m_pkthdr.flowid = net->flowid;
3952                                 m->m_flags |= M_FLOWID;
3953                         } else {
3954                                 if (use_mflowid != 0) {
3955                                         m->m_pkthdr.flowid = mflowid;
3956                                         m->m_flags |= M_FLOWID;
3957                                 }
3958                         }
3959                         packet_length = sctp_calculate_len(m);
3960                         ip = mtod(m, struct ip *);
3961                         ip->ip_v = IPVERSION;
3962                         ip->ip_hl = (sizeof(struct ip) >> 2);
3963                         if (tos_value == 0) {
3964                                 /*
3965                                  * This means especially, that it is not set
3966                                  * at the SCTP layer. So use the value from
3967                                  * the IP layer.
3968                                  */
3969                                 tos_value = inp->ip_inp.inp.inp_ip_tos;
3970                         }
3971                         tos_value &= 0xfc;
3972                         if (ecn_ok) {
3973                                 tos_value |= sctp_get_ect(stcb);
3974                         }
3975                         if ((nofragment_flag) && (port == 0)) {
3976                                 ip->ip_off = IP_DF;
3977                         } else
3978                                 ip->ip_off = 0;
3979
3980                         /* FreeBSD has a function for ip_id's */
3981                         ip->ip_id = ip_newid();
3982
3983                         ip->ip_ttl = inp->ip_inp.inp.inp_ip_ttl;
3984                         ip->ip_len = packet_length;
3985                         ip->ip_tos = tos_value;
3986                         if (port) {
3987                                 ip->ip_p = IPPROTO_UDP;
3988                         } else {
3989                                 ip->ip_p = IPPROTO_SCTP;
3990                         }
3991                         ip->ip_sum = 0;
3992                         if (net == NULL) {
3993                                 ro = &iproute;
3994                                 memset(&iproute, 0, sizeof(iproute));
3995                                 memcpy(&ro->ro_dst, to, to->sa_len);
3996                         } else {
3997                                 ro = (sctp_route_t *) & net->ro;
3998                         }
3999                         /* Now the address selection part */
4000                         ip->ip_dst.s_addr = ((struct sockaddr_in *)to)->sin_addr.s_addr;
4001
4002                         /* call the routine to select the src address */
4003                         if (net && out_of_asoc_ok == 0) {
4004                                 if (net->ro._s_addr && (net->ro._s_addr->localifa_flags & (SCTP_BEING_DELETED | SCTP_ADDR_IFA_UNUSEABLE))) {
4005                                         sctp_free_ifa(net->ro._s_addr);
4006                                         net->ro._s_addr = NULL;
4007                                         net->src_addr_selected = 0;
4008                                         if (ro->ro_rt) {
4009                                                 RTFREE(ro->ro_rt);
4010                                                 ro->ro_rt = NULL;
4011                                         }
4012                                 }
4013                                 if (net->src_addr_selected == 0) {
4014                                         /* Cache the source address */
4015                                         net->ro._s_addr = sctp_source_address_selection(inp, stcb,
4016                                             ro, net, 0,
4017                                             vrf_id);
4018                                         net->src_addr_selected = 1;
4019                                 }
4020                                 if (net->ro._s_addr == NULL) {
4021                                         /* No route to host */
4022                                         net->src_addr_selected = 0;
4023                                         sctp_handle_no_route(stcb, net, so_locked);
4024                                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4025                                         sctp_m_freem(m);
4026                                         return (EHOSTUNREACH);
4027                                 }
4028                                 ip->ip_src = net->ro._s_addr->address.sin.sin_addr;
4029                         } else {
4030                                 if (over_addr == NULL) {
4031                                         struct sctp_ifa *_lsrc;
4032
4033                                         _lsrc = sctp_source_address_selection(inp, stcb, ro,
4034                                             net,
4035                                             out_of_asoc_ok,
4036                                             vrf_id);
4037                                         if (_lsrc == NULL) {
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                                         ip->ip_src = _lsrc->address.sin.sin_addr;
4044                                         sctp_free_ifa(_lsrc);
4045                                 } else {
4046                                         ip->ip_src = over_addr->sin.sin_addr;
4047                                         SCTP_RTALLOC(ro, vrf_id);
4048                                 }
4049                         }
4050                         if (port) {
4051                                 if (htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port)) == 0) {
4052                                         sctp_handle_no_route(stcb, net, so_locked);
4053                                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4054                                         sctp_m_freem(m);
4055                                         return (EHOSTUNREACH);
4056                                 }
4057                                 udp = (struct udphdr *)((caddr_t)ip + sizeof(struct ip));
4058                                 udp->uh_sport = htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port));
4059                                 udp->uh_dport = port;
4060                                 udp->uh_ulen = htons(packet_length - sizeof(struct ip));
4061                                 if (V_udp_cksum) {
4062                                         udp->uh_sum = in_pseudo(ip->ip_src.s_addr, ip->ip_dst.s_addr, udp->uh_ulen + htons(IPPROTO_UDP));
4063                                 } else {
4064                                         udp->uh_sum = 0;
4065                                 }
4066                                 sctphdr = (struct sctphdr *)((caddr_t)udp + sizeof(struct udphdr));
4067                         } else {
4068                                 sctphdr = (struct sctphdr *)((caddr_t)ip + sizeof(struct ip));
4069                         }
4070
4071                         sctphdr->src_port = src_port;
4072                         sctphdr->dest_port = dest_port;
4073                         sctphdr->v_tag = v_tag;
4074                         sctphdr->checksum = 0;
4075
4076                         /*
4077                          * If source address selection fails and we find no
4078                          * route then the ip_output should fail as well with
4079                          * a NO_ROUTE_TO_HOST type error. We probably should
4080                          * catch that somewhere and abort the association
4081                          * right away (assuming this is an INIT being sent).
4082                          */
4083                         if (ro->ro_rt == NULL) {
4084                                 /*
4085                                  * src addr selection failed to find a route
4086                                  * (or valid source addr), so we can't get
4087                                  * there from here (yet)!
4088                                  */
4089                                 sctp_handle_no_route(stcb, net, so_locked);
4090                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4091                                 sctp_m_freem(m);
4092                                 return (EHOSTUNREACH);
4093                         }
4094                         if (ro != &iproute) {
4095                                 memcpy(&iproute, ro, sizeof(*ro));
4096                         }
4097                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "Calling ipv4 output routine from low level src addr:%x\n",
4098                             (uint32_t) (ntohl(ip->ip_src.s_addr)));
4099                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "Destination is %x\n",
4100                             (uint32_t) (ntohl(ip->ip_dst.s_addr)));
4101                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "RTP route is %p through\n",
4102                             ro->ro_rt);
4103
4104                         if (SCTP_GET_HEADER_FOR_OUTPUT(o_pak)) {
4105                                 /* failed to prepend data, give up */
4106                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
4107                                 sctp_m_freem(m);
4108                                 return (ENOMEM);
4109                         }
4110                         SCTP_ATTACH_CHAIN(o_pak, m, packet_length);
4111                         if (port) {
4112 #if defined(SCTP_WITH_NO_CSUM)
4113                                 SCTP_STAT_INCR(sctps_sendnocrc);
4114 #else
4115                                 sctphdr->checksum = sctp_calculate_cksum(m, sizeof(struct ip) + sizeof(struct udphdr));
4116                                 SCTP_STAT_INCR(sctps_sendswcrc);
4117 #endif
4118                                 if (V_udp_cksum) {
4119                                         SCTP_ENABLE_UDP_CSUM(o_pak);
4120                                 }
4121                         } else {
4122 #if defined(SCTP_WITH_NO_CSUM)
4123                                 SCTP_STAT_INCR(sctps_sendnocrc);
4124 #else
4125                                 m->m_pkthdr.csum_flags = CSUM_SCTP;
4126                                 m->m_pkthdr.csum_data = 0;
4127                                 SCTP_STAT_INCR(sctps_sendhwcrc);
4128 #endif
4129                         }
4130 #ifdef SCTP_PACKET_LOGGING
4131                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING)
4132                                 sctp_packet_log(o_pak);
4133 #endif
4134                         /* send it out.  table id is taken from stcb */
4135 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4136                         if ((SCTP_BASE_SYSCTL(sctp_output_unlocked)) && (so_locked)) {
4137                                 so = SCTP_INP_SO(inp);
4138                                 SCTP_SOCKET_UNLOCK(so, 0);
4139                         }
4140 #endif
4141                         SCTP_IP_OUTPUT(ret, o_pak, ro, stcb, vrf_id);
4142 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4143                         if ((SCTP_BASE_SYSCTL(sctp_output_unlocked)) && (so_locked)) {
4144                                 atomic_add_int(&stcb->asoc.refcnt, 1);
4145                                 SCTP_TCB_UNLOCK(stcb);
4146                                 SCTP_SOCKET_LOCK(so, 0);
4147                                 SCTP_TCB_LOCK(stcb);
4148                                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
4149                         }
4150 #endif
4151                         SCTP_STAT_INCR(sctps_sendpackets);
4152                         SCTP_STAT_INCR_COUNTER64(sctps_outpackets);
4153                         if (ret)
4154                                 SCTP_STAT_INCR(sctps_senderrors);
4155
4156                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "IP output returns %d\n", ret);
4157                         if (net == NULL) {
4158                                 /* free tempy routes */
4159                                 if (ro->ro_rt) {
4160                                         RTFREE(ro->ro_rt);
4161                                         ro->ro_rt = NULL;
4162                                 }
4163                         } else {
4164                                 /*
4165                                  * PMTU check versus smallest asoc MTU goes
4166                                  * here
4167                                  */
4168                                 if ((ro->ro_rt != NULL) &&
4169                                     (net->ro._s_addr)) {
4170                                         uint32_t mtu;
4171
4172                                         mtu = SCTP_GATHER_MTU_FROM_ROUTE(net->ro._s_addr, &net->ro._l_addr.sa, ro->ro_rt);
4173                                         if (net->port) {
4174                                                 mtu -= sizeof(struct udphdr);
4175                                         }
4176                                         if (mtu && (stcb->asoc.smallest_mtu > mtu)) {
4177                                                 sctp_mtu_size_reset(inp, &stcb->asoc, mtu);
4178                                                 net->mtu = mtu;
4179                                         }
4180                                 } else if (ro->ro_rt == NULL) {
4181                                         /* route was freed */
4182                                         if (net->ro._s_addr &&
4183                                             net->src_addr_selected) {
4184                                                 sctp_free_ifa(net->ro._s_addr);
4185                                                 net->ro._s_addr = NULL;
4186                                         }
4187                                         net->src_addr_selected = 0;
4188                                 }
4189                         }
4190                         return (ret);
4191                 }
4192 #endif
4193 #ifdef INET6
4194         case AF_INET6:
4195                 {
4196                         uint32_t flowlabel, flowinfo;
4197                         struct ip6_hdr *ip6h;
4198                         struct route_in6 ip6route;
4199                         struct ifnet *ifp;
4200                         struct sockaddr_in6 *sin6, tmp, *lsa6, lsa6_tmp;
4201                         int prev_scope = 0;
4202                         struct sockaddr_in6 lsa6_storage;
4203                         int error;
4204                         u_short prev_port = 0;
4205                         int len;
4206
4207                         if (net) {
4208                                 flowlabel = net->flowlabel;
4209                         } else if (stcb) {
4210                                 flowlabel = stcb->asoc.default_flowlabel;
4211                         } else {
4212                                 flowlabel = inp->sctp_ep.default_flowlabel;
4213                         }
4214                         if (flowlabel == 0) {
4215                                 /*
4216                                  * This means especially, that it is not set
4217                                  * at the SCTP layer. So use the value from
4218                                  * the IP layer.
4219                                  */
4220                                 flowlabel = ntohl(((struct in6pcb *)inp)->in6p_flowinfo);
4221                         }
4222                         flowlabel &= 0x000fffff;
4223                         len = sizeof(struct ip6_hdr) + sizeof(struct sctphdr);
4224                         if (port) {
4225                                 len += sizeof(struct udphdr);
4226                         }
4227                         newm = sctp_get_mbuf_for_msg(len, 1, M_DONTWAIT, 1, MT_DATA);
4228                         if (newm == NULL) {
4229                                 sctp_m_freem(m);
4230                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
4231                                 return (ENOMEM);
4232                         }
4233                         SCTP_ALIGN_TO_END(newm, len);
4234                         SCTP_BUF_LEN(newm) = len;
4235                         SCTP_BUF_NEXT(newm) = m;
4236                         m = newm;
4237                         if (net != NULL) {
4238 #ifdef INVARIANTS
4239                                 if (net->flowidset == 0) {
4240                                         panic("Flow ID not set");
4241                                 }
4242 #endif
4243                                 m->m_pkthdr.flowid = net->flowid;
4244                                 m->m_flags |= M_FLOWID;
4245                         } else {
4246                                 if (use_mflowid != 0) {
4247                                         m->m_pkthdr.flowid = mflowid;
4248                                         m->m_flags |= M_FLOWID;
4249                                 }
4250                         }
4251                         packet_length = sctp_calculate_len(m);
4252
4253                         ip6h = mtod(m, struct ip6_hdr *);
4254                         /* protect *sin6 from overwrite */
4255                         sin6 = (struct sockaddr_in6 *)to;
4256                         tmp = *sin6;
4257                         sin6 = &tmp;
4258
4259                         /* KAME hack: embed scopeid */
4260                         if (sa6_embedscope(sin6, MODULE_GLOBAL(ip6_use_defzone)) != 0) {
4261                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
4262                                 return (EINVAL);
4263                         }
4264                         if (net == NULL) {
4265                                 memset(&ip6route, 0, sizeof(ip6route));
4266                                 ro = (sctp_route_t *) & ip6route;
4267                                 memcpy(&ro->ro_dst, sin6, sin6->sin6_len);
4268                         } else {
4269                                 ro = (sctp_route_t *) & net->ro;
4270                         }
4271                         /*
4272                          * We assume here that inp_flow is in host byte
4273                          * order within the TCB!
4274                          */
4275                         if (tos_value == 0) {
4276                                 /*
4277                                  * This means especially, that it is not set
4278                                  * at the SCTP layer. So use the value from
4279                                  * the IP layer.
4280                                  */
4281                                 tos_value = (ntohl(((struct in6pcb *)inp)->in6p_flowinfo) >> 20) & 0xff;
4282                         }
4283                         tos_value &= 0xfc;
4284                         if (ecn_ok) {
4285                                 tos_value |= sctp_get_ect(stcb);
4286                         }
4287                         flowinfo = 0x06;
4288                         flowinfo <<= 8;
4289                         flowinfo |= tos_value;
4290                         flowinfo <<= 20;
4291                         flowinfo |= flowlabel;
4292                         ip6h->ip6_flow = htonl(flowinfo);
4293                         if (port) {
4294                                 ip6h->ip6_nxt = IPPROTO_UDP;
4295                         } else {
4296                                 ip6h->ip6_nxt = IPPROTO_SCTP;
4297                         }
4298                         ip6h->ip6_plen = (packet_length - sizeof(struct ip6_hdr));
4299                         ip6h->ip6_dst = sin6->sin6_addr;
4300
4301                         /*
4302                          * Add SRC address selection here: we can only reuse
4303                          * to a limited degree the kame src-addr-sel, since
4304                          * we can try their selection but it may not be
4305                          * bound.
4306                          */
4307                         bzero(&lsa6_tmp, sizeof(lsa6_tmp));
4308                         lsa6_tmp.sin6_family = AF_INET6;
4309                         lsa6_tmp.sin6_len = sizeof(lsa6_tmp);
4310                         lsa6 = &lsa6_tmp;
4311                         if (net && out_of_asoc_ok == 0) {
4312                                 if (net->ro._s_addr && (net->ro._s_addr->localifa_flags & (SCTP_BEING_DELETED | SCTP_ADDR_IFA_UNUSEABLE))) {
4313                                         sctp_free_ifa(net->ro._s_addr);
4314                                         net->ro._s_addr = NULL;
4315                                         net->src_addr_selected = 0;
4316                                         if (ro->ro_rt) {
4317                                                 RTFREE(ro->ro_rt);
4318                                                 ro->ro_rt = NULL;
4319                                         }
4320                                 }
4321                                 if (net->src_addr_selected == 0) {
4322                                         sin6 = (struct sockaddr_in6 *)&net->ro._l_addr;
4323                                         /* KAME hack: embed scopeid */
4324                                         if (sa6_embedscope(sin6, MODULE_GLOBAL(ip6_use_defzone)) != 0) {
4325                                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
4326                                                 return (EINVAL);
4327                                         }
4328                                         /* Cache the source address */
4329                                         net->ro._s_addr = sctp_source_address_selection(inp,
4330                                             stcb,
4331                                             ro,
4332                                             net,
4333                                             0,
4334                                             vrf_id);
4335                                         (void)sa6_recoverscope(sin6);
4336                                         net->src_addr_selected = 1;
4337                                 }
4338                                 if (net->ro._s_addr == NULL) {
4339                                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "V6:No route to host\n");
4340                                         net->src_addr_selected = 0;
4341                                         sctp_handle_no_route(stcb, net, so_locked);
4342                                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4343                                         sctp_m_freem(m);
4344                                         return (EHOSTUNREACH);
4345                                 }
4346                                 lsa6->sin6_addr = net->ro._s_addr->address.sin6.sin6_addr;
4347                         } else {
4348                                 sin6 = (struct sockaddr_in6 *)&ro->ro_dst;
4349                                 /* KAME hack: embed scopeid */
4350                                 if (sa6_embedscope(sin6, MODULE_GLOBAL(ip6_use_defzone)) != 0) {
4351                                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
4352                                         return (EINVAL);
4353                                 }
4354                                 if (over_addr == NULL) {
4355                                         struct sctp_ifa *_lsrc;
4356
4357                                         _lsrc = sctp_source_address_selection(inp, stcb, ro,
4358                                             net,
4359                                             out_of_asoc_ok,
4360                                             vrf_id);
4361                                         if (_lsrc == NULL) {
4362                                                 sctp_handle_no_route(stcb, net, so_locked);
4363                                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4364                                                 sctp_m_freem(m);
4365                                                 return (EHOSTUNREACH);
4366                                         }
4367                                         lsa6->sin6_addr = _lsrc->address.sin6.sin6_addr;
4368                                         sctp_free_ifa(_lsrc);
4369                                 } else {
4370                                         lsa6->sin6_addr = over_addr->sin6.sin6_addr;
4371                                         SCTP_RTALLOC(ro, vrf_id);
4372                                 }
4373                                 (void)sa6_recoverscope(sin6);
4374                         }
4375                         lsa6->sin6_port = inp->sctp_lport;
4376
4377                         if (ro->ro_rt == NULL) {
4378                                 /*
4379                                  * src addr selection failed to find a route
4380                                  * (or valid source addr), so we can't get
4381                                  * there from here!
4382                                  */
4383                                 sctp_handle_no_route(stcb, net, so_locked);
4384                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4385                                 sctp_m_freem(m);
4386                                 return (EHOSTUNREACH);
4387                         }
4388                         /*
4389                          * XXX: sa6 may not have a valid sin6_scope_id in
4390                          * the non-SCOPEDROUTING case.
4391                          */
4392                         bzero(&lsa6_storage, sizeof(lsa6_storage));
4393                         lsa6_storage.sin6_family = AF_INET6;
4394                         lsa6_storage.sin6_len = sizeof(lsa6_storage);
4395                         lsa6_storage.sin6_addr = lsa6->sin6_addr;
4396                         if ((error = sa6_recoverscope(&lsa6_storage)) != 0) {
4397                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "recover scope fails error %d\n", error);
4398                                 sctp_m_freem(m);
4399                                 return (error);
4400                         }
4401                         /* XXX */
4402                         lsa6_storage.sin6_addr = lsa6->sin6_addr;
4403                         lsa6_storage.sin6_port = inp->sctp_lport;
4404                         lsa6 = &lsa6_storage;
4405                         ip6h->ip6_src = lsa6->sin6_addr;
4406
4407                         if (port) {
4408                                 if (htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port)) == 0) {
4409                                         sctp_handle_no_route(stcb, net, so_locked);
4410                                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4411                                         sctp_m_freem(m);
4412                                         return (EHOSTUNREACH);
4413                                 }
4414                                 udp = (struct udphdr *)((caddr_t)ip6h + sizeof(struct ip6_hdr));
4415                                 udp->uh_sport = htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port));
4416                                 udp->uh_dport = port;
4417                                 udp->uh_ulen = htons(packet_length - sizeof(struct ip6_hdr));
4418                                 udp->uh_sum = 0;
4419                                 sctphdr = (struct sctphdr *)((caddr_t)udp + sizeof(struct udphdr));
4420                         } else {
4421                                 sctphdr = (struct sctphdr *)((caddr_t)ip6h + sizeof(struct ip6_hdr));
4422                         }
4423
4424                         sctphdr->src_port = src_port;
4425                         sctphdr->dest_port = dest_port;
4426                         sctphdr->v_tag = v_tag;
4427                         sctphdr->checksum = 0;
4428
4429                         /*
4430                          * We set the hop limit now since there is a good
4431                          * chance that our ro pointer is now filled
4432                          */
4433                         ip6h->ip6_hlim = SCTP_GET_HLIM(inp, ro);
4434                         ifp = SCTP_GET_IFN_VOID_FROM_ROUTE(ro);
4435
4436 #ifdef SCTP_DEBUG
4437                         /* Copy to be sure something bad is not happening */
4438                         sin6->sin6_addr = ip6h->ip6_dst;
4439                         lsa6->sin6_addr = ip6h->ip6_src;
4440 #endif
4441
4442                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "Calling ipv6 output routine from low level\n");
4443                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "src: ");
4444                         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT3, (struct sockaddr *)lsa6);
4445                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "dst: ");
4446                         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT3, (struct sockaddr *)sin6);
4447                         if (net) {
4448                                 sin6 = (struct sockaddr_in6 *)&net->ro._l_addr;
4449                                 /*
4450                                  * preserve the port and scope for link
4451                                  * local send
4452                                  */
4453                                 prev_scope = sin6->sin6_scope_id;
4454                                 prev_port = sin6->sin6_port;
4455                         }
4456                         if (SCTP_GET_HEADER_FOR_OUTPUT(o_pak)) {
4457                                 /* failed to prepend data, give up */
4458                                 sctp_m_freem(m);
4459                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
4460                                 return (ENOMEM);
4461                         }
4462                         SCTP_ATTACH_CHAIN(o_pak, m, packet_length);
4463                         if (port) {
4464 #if defined(SCTP_WITH_NO_CSUM)
4465                                 SCTP_STAT_INCR(sctps_sendnocrc);
4466 #else
4467                                 sctphdr->checksum = sctp_calculate_cksum(m, sizeof(struct ip6_hdr) + sizeof(struct udphdr));
4468                                 SCTP_STAT_INCR(sctps_sendswcrc);
4469 #endif
4470                                 if ((udp->uh_sum = in6_cksum(o_pak, IPPROTO_UDP, sizeof(struct ip6_hdr), packet_length - sizeof(struct ip6_hdr))) == 0) {
4471                                         udp->uh_sum = 0xffff;
4472                                 }
4473                         } else {
4474 #if defined(SCTP_WITH_NO_CSUM)
4475                                 SCTP_STAT_INCR(sctps_sendnocrc);
4476 #else
4477                                 m->m_pkthdr.csum_flags = CSUM_SCTP;
4478                                 m->m_pkthdr.csum_data = 0;
4479                                 SCTP_STAT_INCR(sctps_sendhwcrc);
4480 #endif
4481                         }
4482                         /* send it out. table id is taken from stcb */
4483 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4484                         if ((SCTP_BASE_SYSCTL(sctp_output_unlocked)) && (so_locked)) {
4485                                 so = SCTP_INP_SO(inp);
4486                                 SCTP_SOCKET_UNLOCK(so, 0);
4487                         }
4488 #endif
4489 #ifdef SCTP_PACKET_LOGGING
4490                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING)
4491                                 sctp_packet_log(o_pak);
4492 #endif
4493                         SCTP_IP6_OUTPUT(ret, o_pak, (struct route_in6 *)ro, &ifp, stcb, vrf_id);
4494 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4495                         if ((SCTP_BASE_SYSCTL(sctp_output_unlocked)) && (so_locked)) {
4496                                 atomic_add_int(&stcb->asoc.refcnt, 1);
4497                                 SCTP_TCB_UNLOCK(stcb);
4498                                 SCTP_SOCKET_LOCK(so, 0);
4499                                 SCTP_TCB_LOCK(stcb);
4500                                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
4501                         }
4502 #endif
4503                         if (net) {
4504                                 /* for link local this must be done */
4505                                 sin6->sin6_scope_id = prev_scope;
4506                                 sin6->sin6_port = prev_port;
4507                         }
4508                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "return from send is %d\n", ret);
4509                         SCTP_STAT_INCR(sctps_sendpackets);
4510                         SCTP_STAT_INCR_COUNTER64(sctps_outpackets);
4511                         if (ret) {
4512                                 SCTP_STAT_INCR(sctps_senderrors);
4513                         }
4514                         if (net == NULL) {
4515                                 /* Now if we had a temp route free it */
4516                                 if (ro->ro_rt) {
4517                                         RTFREE(ro->ro_rt);
4518                                 }
4519                         } else {
4520                                 /*
4521                                  * PMTU check versus smallest asoc MTU goes
4522                                  * here
4523                                  */
4524                                 if (ro->ro_rt == NULL) {
4525                                         /* Route was freed */
4526                                         if (net->ro._s_addr &&
4527                                             net->src_addr_selected) {
4528                                                 sctp_free_ifa(net->ro._s_addr);
4529                                                 net->ro._s_addr = NULL;
4530                                         }
4531                                         net->src_addr_selected = 0;
4532                                 }
4533                                 if ((ro->ro_rt != NULL) &&
4534                                     (net->ro._s_addr)) {
4535                                         uint32_t mtu;
4536
4537                                         mtu = SCTP_GATHER_MTU_FROM_ROUTE(net->ro._s_addr, &net->ro._l_addr.sa, ro->ro_rt);
4538                                         if (mtu &&
4539                                             (stcb->asoc.smallest_mtu > mtu)) {
4540                                                 sctp_mtu_size_reset(inp, &stcb->asoc, mtu);
4541                                                 net->mtu = mtu;
4542                                                 if (net->port) {
4543                                                         net->mtu -= sizeof(struct udphdr);
4544                                                 }
4545                                         }
4546                                 } else if (ifp) {
4547                                         if (ND_IFINFO(ifp)->linkmtu &&
4548                                             (stcb->asoc.smallest_mtu > ND_IFINFO(ifp)->linkmtu)) {
4549                                                 sctp_mtu_size_reset(inp,
4550                                                     &stcb->asoc,
4551                                                     ND_IFINFO(ifp)->linkmtu);
4552                                         }
4553                                 }
4554                         }
4555                         return (ret);
4556                 }
4557 #endif
4558         default:
4559                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Unknown protocol (TSNH) type %d\n",
4560                     ((struct sockaddr *)to)->sa_family);
4561                 sctp_m_freem(m);
4562                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EFAULT);
4563                 return (EFAULT);
4564         }
4565 }
4566
4567
4568 void
4569 sctp_send_initiate(struct sctp_inpcb *inp, struct sctp_tcb *stcb, int so_locked
4570 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
4571     SCTP_UNUSED
4572 #endif
4573 )
4574 {
4575         struct mbuf *m, *m_at, *mp_last;
4576         struct sctp_nets *net;
4577         struct sctp_init_chunk *init;
4578         struct sctp_supported_addr_param *sup_addr;
4579         struct sctp_adaptation_layer_indication *ali;
4580         struct sctp_ecn_supported_param *ecn;
4581         struct sctp_prsctp_supported_param *prsctp;
4582         struct sctp_supported_chunk_types_param *pr_supported;
4583         int cnt_inits_to = 0;
4584         int padval, ret;
4585         int num_ext;
4586         int p_len;
4587
4588         /* INIT's always go to the primary (and usually ONLY address) */
4589         mp_last = NULL;
4590         net = stcb->asoc.primary_destination;
4591         if (net == NULL) {
4592                 net = TAILQ_FIRST(&stcb->asoc.nets);
4593                 if (net == NULL) {
4594                         /* TSNH */
4595                         return;
4596                 }
4597                 /* we confirm any address we send an INIT to */
4598                 net->dest_state &= ~SCTP_ADDR_UNCONFIRMED;
4599                 (void)sctp_set_primary_addr(stcb, NULL, net);
4600         } else {
4601                 /* we confirm any address we send an INIT to */
4602                 net->dest_state &= ~SCTP_ADDR_UNCONFIRMED;
4603         }
4604         SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT\n");
4605 #ifdef INET6
4606         if (((struct sockaddr *)&(net->ro._l_addr))->sa_family == AF_INET6) {
4607                 /*
4608                  * special hook, if we are sending to link local it will not
4609                  * show up in our private address count.
4610                  */
4611                 struct sockaddr_in6 *sin6l;
4612
4613                 sin6l = &net->ro._l_addr.sin6;
4614                 if (IN6_IS_ADDR_LINKLOCAL(&sin6l->sin6_addr))
4615                         cnt_inits_to = 1;
4616         }
4617 #endif
4618         if (SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
4619                 /* This case should not happen */
4620                 SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT - failed timer?\n");
4621                 return;
4622         }
4623         /* start the INIT timer */
4624         sctp_timer_start(SCTP_TIMER_TYPE_INIT, inp, stcb, net);
4625
4626         m = sctp_get_mbuf_for_msg(MCLBYTES, 1, M_DONTWAIT, 1, MT_DATA);
4627         if (m == NULL) {
4628                 /* No memory, INIT timer will re-attempt. */
4629                 SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT - mbuf?\n");
4630                 return;
4631         }
4632         SCTP_BUF_LEN(m) = sizeof(struct sctp_init_chunk);
4633         /*
4634          * assume peer supports asconf in order to be able to queue local
4635          * address changes while an INIT is in flight and before the assoc
4636          * is established.
4637          */
4638         stcb->asoc.peer_supports_asconf = 1;
4639         /* Now lets put the SCTP header in place */
4640         init = mtod(m, struct sctp_init_chunk *);
4641         /* now the chunk header */
4642         init->ch.chunk_type = SCTP_INITIATION;
4643         init->ch.chunk_flags = 0;
4644         /* fill in later from mbuf we build */
4645         init->ch.chunk_length = 0;
4646         /* place in my tag */
4647         init->init.initiate_tag = htonl(stcb->asoc.my_vtag);
4648         /* set up some of the credits. */
4649         init->init.a_rwnd = htonl(max(inp->sctp_socket ? SCTP_SB_LIMIT_RCV(inp->sctp_socket) : 0,
4650             SCTP_MINIMAL_RWND));
4651
4652         init->init.num_outbound_streams = htons(stcb->asoc.pre_open_streams);
4653         init->init.num_inbound_streams = htons(stcb->asoc.max_inbound_streams);
4654         init->init.initial_tsn = htonl(stcb->asoc.init_seq_number);
4655         /* now the address restriction */
4656         /* XXX Should we take the address family of the socket into account? */
4657         sup_addr = (struct sctp_supported_addr_param *)((caddr_t)init +
4658             sizeof(*init));
4659         sup_addr->ph.param_type = htons(SCTP_SUPPORTED_ADDRTYPE);
4660 #ifdef INET6
4661 #ifdef INET
4662         /* we support 2 types: IPv4/IPv6 */
4663         sup_addr->ph.param_length = htons(sizeof(struct sctp_paramhdr) + 2 * sizeof(uint16_t));
4664         sup_addr->addr_type[0] = htons(SCTP_IPV4_ADDRESS);
4665         sup_addr->addr_type[1] = htons(SCTP_IPV6_ADDRESS);
4666 #else
4667         /* we support 1 type: IPv6 */
4668         sup_addr->ph.param_length = htons(sizeof(struct sctp_paramhdr) + sizeof(uint16_t));
4669         sup_addr->addr_type[0] = htons(SCTP_IPV6_ADDRESS);
4670         sup_addr->addr_type[1] = htons(0);      /* this is the padding */
4671 #endif
4672 #else
4673         /* we support 1 type: IPv4 */
4674         sup_addr->ph.param_length = htons(sizeof(struct sctp_paramhdr) + sizeof(uint16_t));
4675         sup_addr->addr_type[0] = htons(SCTP_IPV4_ADDRESS);
4676         sup_addr->addr_type[1] = htons(0);      /* this is the padding */
4677 #endif
4678         SCTP_BUF_LEN(m) += sizeof(struct sctp_supported_addr_param);
4679         /* adaptation layer indication parameter */
4680         ali = (struct sctp_adaptation_layer_indication *)((caddr_t)sup_addr + sizeof(struct sctp_supported_addr_param));
4681         ali->ph.param_type = htons(SCTP_ULP_ADAPTATION);
4682         ali->ph.param_length = htons(sizeof(*ali));
4683         ali->indication = ntohl(inp->sctp_ep.adaptation_layer_indicator);
4684         SCTP_BUF_LEN(m) += sizeof(*ali);
4685         ecn = (struct sctp_ecn_supported_param *)((caddr_t)ali + sizeof(*ali));
4686
4687         if (SCTP_BASE_SYSCTL(sctp_inits_include_nat_friendly)) {
4688                 /* Add NAT friendly parameter */
4689                 struct sctp_paramhdr *ph;
4690
4691                 ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+SCTP_BUF_LEN(m));
4692                 ph->param_type = htons(SCTP_HAS_NAT_SUPPORT);
4693                 ph->param_length = htons(sizeof(struct sctp_paramhdr));
4694                 SCTP_BUF_LEN(m) += sizeof(struct sctp_paramhdr);
4695                 ecn = (struct sctp_ecn_supported_param *)((caddr_t)ph + sizeof(*ph));
4696         }
4697         /* now any cookie time extensions */
4698         if (stcb->asoc.cookie_preserve_req) {
4699                 struct sctp_cookie_perserve_param *cookie_preserve;
4700
4701                 cookie_preserve = (struct sctp_cookie_perserve_param *)(ecn);
4702                 cookie_preserve->ph.param_type = htons(SCTP_COOKIE_PRESERVE);
4703                 cookie_preserve->ph.param_length = htons(
4704                     sizeof(*cookie_preserve));
4705                 cookie_preserve->time = htonl(stcb->asoc.cookie_preserve_req);
4706                 SCTP_BUF_LEN(m) += sizeof(*cookie_preserve);
4707                 ecn = (struct sctp_ecn_supported_param *)(
4708                     (caddr_t)cookie_preserve + sizeof(*cookie_preserve));
4709                 stcb->asoc.cookie_preserve_req = 0;
4710         }
4711         /* ECN parameter */
4712         if (stcb->asoc.ecn_allowed == 1) {
4713                 ecn->ph.param_type = htons(SCTP_ECN_CAPABLE);
4714                 ecn->ph.param_length = htons(sizeof(*ecn));
4715                 SCTP_BUF_LEN(m) += sizeof(*ecn);
4716                 prsctp = (struct sctp_prsctp_supported_param *)((caddr_t)ecn +
4717                     sizeof(*ecn));
4718         } else {
4719                 prsctp = (struct sctp_prsctp_supported_param *)((caddr_t)ecn);
4720         }
4721         /* And now tell the peer we do pr-sctp */
4722         prsctp->ph.param_type = htons(SCTP_PRSCTP_SUPPORTED);
4723         prsctp->ph.param_length = htons(sizeof(*prsctp));
4724         SCTP_BUF_LEN(m) += sizeof(*prsctp);
4725
4726         /* And now tell the peer we do all the extensions */
4727         pr_supported = (struct sctp_supported_chunk_types_param *)
4728             ((caddr_t)prsctp + sizeof(*prsctp));
4729         pr_supported->ph.param_type = htons(SCTP_SUPPORTED_CHUNK_EXT);
4730         num_ext = 0;
4731         pr_supported->chunk_types[num_ext++] = SCTP_ASCONF;
4732         pr_supported->chunk_types[num_ext++] = SCTP_ASCONF_ACK;
4733         pr_supported->chunk_types[num_ext++] = SCTP_FORWARD_CUM_TSN;
4734         pr_supported->chunk_types[num_ext++] = SCTP_PACKET_DROPPED;
4735         pr_supported->chunk_types[num_ext++] = SCTP_STREAM_RESET;
4736         if (!SCTP_BASE_SYSCTL(sctp_auth_disable)) {
4737                 pr_supported->chunk_types[num_ext++] = SCTP_AUTHENTICATION;
4738         }
4739         if (stcb->asoc.sctp_nr_sack_on_off == 1) {
4740                 pr_supported->chunk_types[num_ext++] = SCTP_NR_SELECTIVE_ACK;
4741         }
4742         p_len = sizeof(*pr_supported) + num_ext;
4743         pr_supported->ph.param_length = htons(p_len);
4744         bzero((caddr_t)pr_supported + p_len, SCTP_SIZE32(p_len) - p_len);
4745         SCTP_BUF_LEN(m) += SCTP_SIZE32(p_len);
4746
4747
4748         /* add authentication parameters */
4749         if (!SCTP_BASE_SYSCTL(sctp_auth_disable)) {
4750                 struct sctp_auth_random *randp;
4751                 struct sctp_auth_hmac_algo *hmacs;
4752                 struct sctp_auth_chunk_list *chunks;
4753
4754                 /* attach RANDOM parameter, if available */
4755                 if (stcb->asoc.authinfo.random != NULL) {
4756                         randp = (struct sctp_auth_random *)(mtod(m, caddr_t)+SCTP_BUF_LEN(m));
4757                         p_len = sizeof(*randp) + stcb->asoc.authinfo.random_len;
4758                         /* random key already contains the header */
4759                         bcopy(stcb->asoc.authinfo.random->key, randp, p_len);
4760                         /* zero out any padding required */
4761                         bzero((caddr_t)randp + p_len, SCTP_SIZE32(p_len) - p_len);
4762                         SCTP_BUF_LEN(m) += SCTP_SIZE32(p_len);
4763                 }
4764                 /* add HMAC_ALGO parameter */
4765                 hmacs = (struct sctp_auth_hmac_algo *)(mtod(m, caddr_t)+SCTP_BUF_LEN(m));
4766                 p_len = sctp_serialize_hmaclist(stcb->asoc.local_hmacs,
4767                     (uint8_t *) hmacs->hmac_ids);
4768                 if (p_len > 0) {
4769                         p_len += sizeof(*hmacs);
4770                         hmacs->ph.param_type = htons(SCTP_HMAC_LIST);
4771                         hmacs->ph.param_length = htons(p_len);
4772                         /* zero out any padding required */
4773                         bzero((caddr_t)hmacs + p_len, SCTP_SIZE32(p_len) - p_len);
4774                         SCTP_BUF_LEN(m) += SCTP_SIZE32(p_len);
4775                 }
4776                 /* add CHUNKS parameter */
4777                 chunks = (struct sctp_auth_chunk_list *)(mtod(m, caddr_t)+SCTP_BUF_LEN(m));
4778                 p_len = sctp_serialize_auth_chunks(stcb->asoc.local_auth_chunks,
4779                     chunks->chunk_types);
4780                 if (p_len > 0) {
4781                         p_len += sizeof(*chunks);
4782                         chunks->ph.param_type = htons(SCTP_CHUNK_LIST);
4783                         chunks->ph.param_length = htons(p_len);
4784                         /* zero out any padding required */
4785                         bzero((caddr_t)chunks + p_len, SCTP_SIZE32(p_len) - p_len);
4786                         SCTP_BUF_LEN(m) += SCTP_SIZE32(p_len);
4787                 }
4788         }
4789         /* now the addresses */
4790         {
4791                 struct sctp_scoping scp;
4792
4793                 /*
4794                  * To optimize this we could put the scoping stuff into a
4795                  * structure and remove the individual uint8's from the
4796                  * assoc structure. Then we could just sifa in the address
4797                  * within the stcb. But for now this is a quick hack to get
4798                  * the address stuff teased apart.
4799                  */
4800
4801                 scp.ipv4_addr_legal = stcb->asoc.ipv4_addr_legal;
4802                 scp.ipv6_addr_legal = stcb->asoc.ipv6_addr_legal;
4803                 scp.loopback_scope = stcb->asoc.loopback_scope;
4804                 scp.ipv4_local_scope = stcb->asoc.ipv4_local_scope;
4805                 scp.local_scope = stcb->asoc.local_scope;
4806                 scp.site_scope = stcb->asoc.site_scope;
4807
4808                 sctp_add_addresses_to_i_ia(inp, stcb, &scp, m, cnt_inits_to);
4809         }
4810
4811         /* calulate the size and update pkt header and chunk header */
4812         p_len = 0;
4813         for (m_at = m; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
4814                 if (SCTP_BUF_NEXT(m_at) == NULL)
4815                         mp_last = m_at;
4816                 p_len += SCTP_BUF_LEN(m_at);
4817         }
4818         init->ch.chunk_length = htons(p_len);
4819         /*
4820          * We sifa 0 here to NOT set IP_DF if its IPv4, we ignore the return
4821          * here since the timer will drive a retranmission.
4822          */
4823
4824         /* I don't expect this to execute but we will be safe here */
4825         padval = p_len % 4;
4826         if ((padval) && (mp_last)) {
4827                 /*
4828                  * The compiler worries that mp_last may not be set even
4829                  * though I think it is impossible :-> however we add
4830                  * mp_last here just in case.
4831                  */
4832                 ret = sctp_add_pad_tombuf(mp_last, (4 - padval));
4833                 if (ret) {
4834                         /* Houston we have a problem, no space */
4835                         sctp_m_freem(m);
4836                         return;
4837                 }
4838         }
4839         SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT - calls lowlevel_output\n");
4840         ret = sctp_lowlevel_chunk_output(inp, stcb, net,
4841             (struct sockaddr *)&net->ro._l_addr,
4842             m, 0, NULL, 0, 0, 0, 0,
4843             inp->sctp_lport, stcb->rport, htonl(0),
4844             net->port, NULL,
4845             0, 0,
4846             so_locked);
4847         SCTPDBG(SCTP_DEBUG_OUTPUT4, "lowlevel_output - %d\n", ret);
4848         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
4849         (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
4850 }
4851
4852 struct mbuf *
4853 sctp_arethere_unrecognized_parameters(struct mbuf *in_initpkt,
4854     int param_offset, int *abort_processing, struct sctp_chunkhdr *cp, int *nat_friendly)
4855 {
4856         /*
4857          * Given a mbuf containing an INIT or INIT-ACK with the param_offset
4858          * being equal to the beginning of the params i.e. (iphlen +
4859          * sizeof(struct sctp_init_msg) parse through the parameters to the
4860          * end of the mbuf verifying that all parameters are known.
4861          *
4862          * For unknown parameters build and return a mbuf with
4863          * UNRECOGNIZED_PARAMETER errors. If the flags indicate to stop
4864          * processing this chunk stop, and set *abort_processing to 1.
4865          *
4866          * By having param_offset be pre-set to where parameters begin it is
4867          * hoped that this routine may be reused in the future by new
4868          * features.
4869          */
4870         struct sctp_paramhdr *phdr, params;
4871
4872         struct mbuf *mat, *op_err;
4873         char tempbuf[SCTP_PARAM_BUFFER_SIZE];
4874         int at, limit, pad_needed;
4875         uint16_t ptype, plen, padded_size;
4876         int err_at;
4877
4878         *abort_processing = 0;
4879         mat = in_initpkt;
4880         err_at = 0;
4881         limit = ntohs(cp->chunk_length) - sizeof(struct sctp_init_chunk);
4882         at = param_offset;
4883         op_err = NULL;
4884         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Check for unrecognized param's\n");
4885         phdr = sctp_get_next_param(mat, at, &params, sizeof(params));
4886         while ((phdr != NULL) && ((size_t)limit >= sizeof(struct sctp_paramhdr))) {
4887                 ptype = ntohs(phdr->param_type);
4888                 plen = ntohs(phdr->param_length);
4889                 if ((plen > limit) || (plen < sizeof(struct sctp_paramhdr))) {
4890                         /* wacked parameter */
4891                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error %d\n", plen);
4892                         goto invalid_size;
4893                 }
4894                 limit -= SCTP_SIZE32(plen);
4895                 /*-
4896                  * All parameters for all chunks that we know/understand are
4897                  * listed here. We process them other places and make
4898                  * appropriate stop actions per the upper bits. However this
4899                  * is the generic routine processor's can call to get back
4900                  * an operr.. to either incorporate (init-ack) or send.
4901                  */
4902                 padded_size = SCTP_SIZE32(plen);
4903                 switch (ptype) {
4904                         /* Param's with variable size */
4905                 case SCTP_HEARTBEAT_INFO:
4906                 case SCTP_STATE_COOKIE:
4907                 case SCTP_UNRECOG_PARAM:
4908                 case SCTP_ERROR_CAUSE_IND:
4909                         /* ok skip fwd */
4910                         at += padded_size;
4911                         break;
4912                         /* Param's with variable size within a range */
4913                 case SCTP_CHUNK_LIST:
4914                 case SCTP_SUPPORTED_CHUNK_EXT:
4915                         if (padded_size > (sizeof(struct sctp_supported_chunk_types_param) + (sizeof(uint8_t) * SCTP_MAX_SUPPORTED_EXT))) {
4916                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error chklist %d\n", plen);
4917                                 goto invalid_size;
4918                         }
4919                         at += padded_size;
4920                         break;
4921                 case SCTP_SUPPORTED_ADDRTYPE:
4922                         if (padded_size > SCTP_MAX_ADDR_PARAMS_SIZE) {
4923                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error supaddrtype %d\n", plen);
4924                                 goto invalid_size;
4925                         }
4926                         at += padded_size;
4927                         break;
4928                 case SCTP_RANDOM:
4929                         if (padded_size > (sizeof(struct sctp_auth_random) + SCTP_RANDOM_MAX_SIZE)) {
4930                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error random %d\n", plen);
4931                                 goto invalid_size;
4932                         }
4933                         at += padded_size;
4934                         break;
4935                 case SCTP_SET_PRIM_ADDR:
4936                 case SCTP_DEL_IP_ADDRESS:
4937                 case SCTP_ADD_IP_ADDRESS:
4938                         if ((padded_size != sizeof(struct sctp_asconf_addrv4_param)) &&
4939                             (padded_size != sizeof(struct sctp_asconf_addr_param))) {
4940                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error setprim %d\n", plen);
4941                                 goto invalid_size;
4942                         }
4943                         at += padded_size;
4944                         break;
4945                         /* Param's with a fixed size */
4946                 case SCTP_IPV4_ADDRESS:
4947                         if (padded_size != sizeof(struct sctp_ipv4addr_param)) {
4948                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error ipv4 addr %d\n", plen);
4949                                 goto invalid_size;
4950                         }
4951                         at += padded_size;
4952                         break;
4953                 case SCTP_IPV6_ADDRESS:
4954                         if (padded_size != sizeof(struct sctp_ipv6addr_param)) {
4955                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error ipv6 addr %d\n", plen);
4956                                 goto invalid_size;
4957                         }
4958                         at += padded_size;
4959                         break;
4960                 case SCTP_COOKIE_PRESERVE:
4961                         if (padded_size != sizeof(struct sctp_cookie_perserve_param)) {
4962                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error cookie-preserve %d\n", plen);
4963                                 goto invalid_size;
4964                         }
4965                         at += padded_size;
4966                         break;
4967                 case SCTP_HAS_NAT_SUPPORT:
4968                         *nat_friendly = 1;
4969                         /* fall through */
4970                 case SCTP_PRSCTP_SUPPORTED:
4971
4972                         if (padded_size != sizeof(struct sctp_paramhdr)) {
4973                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error prsctp/nat support %d\n", plen);
4974                                 goto invalid_size;
4975                         }
4976                         at += padded_size;
4977                         break;
4978                 case SCTP_ECN_CAPABLE:
4979                         if (padded_size != sizeof(struct sctp_ecn_supported_param)) {
4980                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error ecn %d\n", plen);
4981                                 goto invalid_size;
4982                         }
4983                         at += padded_size;
4984                         break;
4985                 case SCTP_ULP_ADAPTATION:
4986                         if (padded_size != sizeof(struct sctp_adaptation_layer_indication)) {
4987                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error adapatation %d\n", plen);
4988                                 goto invalid_size;
4989                         }
4990                         at += padded_size;
4991                         break;
4992                 case SCTP_SUCCESS_REPORT:
4993                         if (padded_size != sizeof(struct sctp_asconf_paramhdr)) {
4994                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error success %d\n", plen);
4995                                 goto invalid_size;
4996                         }
4997                         at += padded_size;
4998                         break;
4999                 case SCTP_HOSTNAME_ADDRESS:
5000                         {
5001                                 /* We can NOT handle HOST NAME addresses!! */
5002                                 int l_len;
5003
5004                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Can't handle hostname addresses.. abort processing\n");
5005                                 *abort_processing = 1;
5006                                 if (op_err == NULL) {
5007                                         /* Ok need to try to get a mbuf */
5008 #ifdef INET6
5009                                         l_len = sizeof(struct ip6_hdr) + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
5010 #else
5011                                         l_len = sizeof(struct ip) + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
5012 #endif
5013                                         l_len += plen;
5014                                         l_len += sizeof(struct sctp_paramhdr);
5015                                         op_err = sctp_get_mbuf_for_msg(l_len, 0, M_DONTWAIT, 1, MT_DATA);
5016                                         if (op_err) {
5017                                                 SCTP_BUF_LEN(op_err) = 0;
5018                                                 /*
5019                                                  * pre-reserve space for ip
5020                                                  * and sctp header  and
5021                                                  * chunk hdr
5022                                                  */
5023 #ifdef INET6
5024                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip6_hdr));
5025 #else
5026                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip));
5027 #endif
5028                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctphdr));
5029                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctp_chunkhdr));
5030                                         }
5031                                 }
5032                                 if (op_err) {
5033                                         /* If we have space */
5034                                         struct sctp_paramhdr s;
5035
5036                                         if (err_at % 4) {
5037                                                 uint32_t cpthis = 0;
5038
5039                                                 pad_needed = 4 - (err_at % 4);
5040                                                 m_copyback(op_err, err_at, pad_needed, (caddr_t)&cpthis);
5041                                                 err_at += pad_needed;
5042                                         }
5043                                         s.param_type = htons(SCTP_CAUSE_UNRESOLVABLE_ADDR);
5044                                         s.param_length = htons(sizeof(s) + plen);
5045                                         m_copyback(op_err, err_at, sizeof(s), (caddr_t)&s);
5046                                         err_at += sizeof(s);
5047                                         phdr = sctp_get_next_param(mat, at, (struct sctp_paramhdr *)tempbuf, min(sizeof(tempbuf), plen));
5048                                         if (phdr == NULL) {
5049                                                 sctp_m_freem(op_err);
5050                                                 /*
5051                                                  * we are out of memory but
5052                                                  * we still need to have a
5053                                                  * look at what to do (the
5054                                                  * system is in trouble
5055                                                  * though).
5056                                                  */
5057                                                 return (NULL);
5058                                         }
5059                                         m_copyback(op_err, err_at, plen, (caddr_t)phdr);
5060                                 }
5061                                 return (op_err);
5062                                 break;
5063                         }
5064                 default:
5065                         /*
5066                          * we do not recognize the parameter figure out what
5067                          * we do.
5068                          */
5069                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Hit default param %x\n", ptype);
5070                         if ((ptype & 0x4000) == 0x4000) {
5071                                 /* Report bit is set?? */
5072                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "report op err\n");
5073                                 if (op_err == NULL) {
5074                                         int l_len;
5075
5076                                         /* Ok need to try to get an mbuf */
5077 #ifdef INET6
5078                                         l_len = sizeof(struct ip6_hdr) + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
5079 #else
5080                                         l_len = sizeof(struct ip) + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
5081 #endif
5082                                         l_len += plen;
5083                                         l_len += sizeof(struct sctp_paramhdr);
5084                                         op_err = sctp_get_mbuf_for_msg(l_len, 0, M_DONTWAIT, 1, MT_DATA);
5085                                         if (op_err) {
5086                                                 SCTP_BUF_LEN(op_err) = 0;
5087 #ifdef INET6
5088                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip6_hdr));
5089 #else
5090                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip));
5091 #endif
5092                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctphdr));
5093                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctp_chunkhdr));
5094                                         }
5095                                 }
5096                                 if (op_err) {
5097                                         /* If we have space */
5098                                         struct sctp_paramhdr s;
5099
5100                                         if (err_at % 4) {
5101                                                 uint32_t cpthis = 0;
5102
5103                                                 pad_needed = 4 - (err_at % 4);
5104                                                 m_copyback(op_err, err_at, pad_needed, (caddr_t)&cpthis);
5105                                                 err_at += pad_needed;
5106                                         }
5107                                         s.param_type = htons(SCTP_UNRECOG_PARAM);
5108                                         s.param_length = htons(sizeof(s) + plen);
5109                                         m_copyback(op_err, err_at, sizeof(s), (caddr_t)&s);
5110                                         err_at += sizeof(s);
5111                                         if (plen > sizeof(tempbuf)) {
5112                                                 plen = sizeof(tempbuf);
5113                                         }
5114                                         phdr = sctp_get_next_param(mat, at, (struct sctp_paramhdr *)tempbuf, min(sizeof(tempbuf), plen));
5115                                         if (phdr == NULL) {
5116                                                 sctp_m_freem(op_err);
5117                                                 /*
5118                                                  * we are out of memory but
5119                                                  * we still need to have a
5120                                                  * look at what to do (the
5121                                                  * system is in trouble
5122                                                  * though).
5123                                                  */
5124                                                 op_err = NULL;
5125                                                 goto more_processing;
5126                                         }
5127                                         m_copyback(op_err, err_at, plen, (caddr_t)phdr);
5128                                         err_at += plen;
5129                                 }
5130                         }
5131         more_processing:
5132                         if ((ptype & 0x8000) == 0x0000) {
5133                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "stop proc\n");
5134                                 return (op_err);
5135                         } else {
5136                                 /* skip this chunk and continue processing */
5137                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "move on\n");
5138                                 at += SCTP_SIZE32(plen);
5139                         }
5140                         break;
5141
5142                 }
5143                 phdr = sctp_get_next_param(mat, at, &params, sizeof(params));
5144         }
5145         return (op_err);
5146 invalid_size:
5147         SCTPDBG(SCTP_DEBUG_OUTPUT1, "abort flag set\n");
5148         *abort_processing = 1;
5149         if ((op_err == NULL) && phdr) {
5150                 int l_len;
5151
5152 #ifdef INET6
5153                 l_len = sizeof(struct ip6_hdr) + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
5154 #else
5155                 l_len = sizeof(struct ip) + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
5156 #endif
5157                 l_len += (2 * sizeof(struct sctp_paramhdr));
5158                 op_err = sctp_get_mbuf_for_msg(l_len, 0, M_DONTWAIT, 1, MT_DATA);
5159                 if (op_err) {
5160                         SCTP_BUF_LEN(op_err) = 0;
5161 #ifdef INET6
5162                         SCTP_BUF_RESV_UF(op_err, sizeof(struct ip6_hdr));
5163 #else
5164                         SCTP_BUF_RESV_UF(op_err, sizeof(struct ip));
5165 #endif
5166                         SCTP_BUF_RESV_UF(op_err, sizeof(struct sctphdr));
5167                         SCTP_BUF_RESV_UF(op_err, sizeof(struct sctp_chunkhdr));
5168                 }
5169         }
5170         if ((op_err) && phdr) {
5171                 struct sctp_paramhdr s;
5172
5173                 if (err_at % 4) {
5174                         uint32_t cpthis = 0;
5175
5176                         pad_needed = 4 - (err_at % 4);
5177                         m_copyback(op_err, err_at, pad_needed, (caddr_t)&cpthis);
5178                         err_at += pad_needed;
5179                 }
5180                 s.param_type = htons(SCTP_CAUSE_PROTOCOL_VIOLATION);
5181                 s.param_length = htons(sizeof(s) + sizeof(struct sctp_paramhdr));
5182                 m_copyback(op_err, err_at, sizeof(s), (caddr_t)&s);
5183                 err_at += sizeof(s);
5184                 /* Only copy back the p-hdr that caused the issue */
5185                 m_copyback(op_err, err_at, sizeof(struct sctp_paramhdr), (caddr_t)phdr);
5186         }
5187         return (op_err);
5188 }
5189
5190 static int
5191 sctp_are_there_new_addresses(struct sctp_association *asoc,
5192     struct mbuf *in_initpkt, int offset, struct sockaddr *src)
5193 {
5194         /*
5195          * Given a INIT packet, look through the packet to verify that there
5196          * are NO new addresses. As we go through the parameters add reports
5197          * of any un-understood parameters that require an error.  Also we
5198          * must return (1) to drop the packet if we see a un-understood
5199          * parameter that tells us to drop the chunk.
5200          */
5201         struct sockaddr *sa_touse;
5202         struct sockaddr *sa;
5203         struct sctp_paramhdr *phdr, params;
5204         uint16_t ptype, plen;
5205         uint8_t fnd;
5206         struct sctp_nets *net;
5207
5208 #ifdef INET
5209         struct sockaddr_in sin4, *sa4;
5210
5211 #endif
5212 #ifdef INET6
5213         struct sockaddr_in6 sin6, *sa6;
5214
5215 #endif
5216
5217 #ifdef INET
5218         memset(&sin4, 0, sizeof(sin4));
5219         sin4.sin_family = AF_INET;
5220         sin4.sin_len = sizeof(sin4);
5221 #endif
5222 #ifdef INET6
5223         memset(&sin6, 0, sizeof(sin6));
5224         sin6.sin6_family = AF_INET6;
5225         sin6.sin6_len = sizeof(sin6);
5226 #endif
5227         /* First what about the src address of the pkt ? */
5228         fnd = 0;
5229         TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
5230                 sa = (struct sockaddr *)&net->ro._l_addr;
5231                 if (sa->sa_family == src->sa_family) {
5232 #ifdef INET
5233                         if (sa->sa_family == AF_INET) {
5234                                 struct sockaddr_in *src4;
5235
5236                                 sa4 = (struct sockaddr_in *)sa;
5237                                 src4 = (struct sockaddr_in *)src;
5238                                 if (sa4->sin_addr.s_addr == src4->sin_addr.s_addr) {
5239                                         fnd = 1;
5240                                         break;
5241                                 }
5242                         }
5243 #endif
5244 #ifdef INET6
5245                         if (sa->sa_family == AF_INET6) {
5246                                 struct sockaddr_in6 *src6;
5247
5248                                 sa6 = (struct sockaddr_in6 *)sa;
5249                                 src6 = (struct sockaddr_in6 *)src;
5250                                 if (SCTP6_ARE_ADDR_EQUAL(sa6, src6)) {
5251                                         fnd = 1;
5252                                         break;
5253                                 }
5254                         }
5255 #endif
5256                 }
5257         }
5258         if (fnd == 0) {
5259                 /* New address added! no need to look futher. */
5260                 return (1);
5261         }
5262         /* Ok so far lets munge through the rest of the packet */
5263         offset += sizeof(struct sctp_init_chunk);
5264         phdr = sctp_get_next_param(in_initpkt, offset, &params, sizeof(params));
5265         while (phdr) {
5266                 sa_touse = NULL;
5267                 ptype = ntohs(phdr->param_type);
5268                 plen = ntohs(phdr->param_length);
5269                 switch (ptype) {
5270 #ifdef INET
5271                 case SCTP_IPV4_ADDRESS:
5272                         {
5273                                 struct sctp_ipv4addr_param *p4, p4_buf;
5274
5275                                 phdr = sctp_get_next_param(in_initpkt, offset,
5276                                     (struct sctp_paramhdr *)&p4_buf, sizeof(p4_buf));
5277                                 if (plen != sizeof(struct sctp_ipv4addr_param) ||
5278                                     phdr == NULL) {
5279                                         return (1);
5280                                 }
5281                                 p4 = (struct sctp_ipv4addr_param *)phdr;
5282                                 sin4.sin_addr.s_addr = p4->addr;
5283                                 sa_touse = (struct sockaddr *)&sin4;
5284                                 break;
5285                         }
5286 #endif
5287 #ifdef INET6
5288                 case SCTP_IPV6_ADDRESS:
5289                         {
5290                                 struct sctp_ipv6addr_param *p6, p6_buf;
5291
5292                                 phdr = sctp_get_next_param(in_initpkt, offset,
5293                                     (struct sctp_paramhdr *)&p6_buf, sizeof(p6_buf));
5294                                 if (plen != sizeof(struct sctp_ipv6addr_param) ||
5295                                     phdr == NULL) {
5296                                         return (1);
5297                                 }
5298                                 p6 = (struct sctp_ipv6addr_param *)phdr;
5299                                 memcpy((caddr_t)&sin6.sin6_addr, p6->addr,
5300                                     sizeof(p6->addr));
5301                                 sa_touse = (struct sockaddr *)&sin6;
5302                                 break;
5303                         }
5304 #endif
5305                 default:
5306                         sa_touse = NULL;
5307                         break;
5308                 }
5309                 if (sa_touse) {
5310                         /* ok, sa_touse points to one to check */
5311                         fnd = 0;
5312                         TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
5313                                 sa = (struct sockaddr *)&net->ro._l_addr;
5314                                 if (sa->sa_family != sa_touse->sa_family) {
5315                                         continue;
5316                                 }
5317 #ifdef INET
5318                                 if (sa->sa_family == AF_INET) {
5319                                         sa4 = (struct sockaddr_in *)sa;
5320                                         if (sa4->sin_addr.s_addr ==
5321                                             sin4.sin_addr.s_addr) {
5322                                                 fnd = 1;
5323                                                 break;
5324                                         }
5325                                 }
5326 #endif
5327 #ifdef INET6
5328                                 if (sa->sa_family == AF_INET6) {
5329                                         sa6 = (struct sockaddr_in6 *)sa;
5330                                         if (SCTP6_ARE_ADDR_EQUAL(
5331                                             sa6, &sin6)) {
5332                                                 fnd = 1;
5333                                                 break;
5334                                         }
5335                                 }
5336 #endif
5337                         }
5338                         if (!fnd) {
5339                                 /* New addr added! no need to look further */
5340                                 return (1);
5341                         }
5342                 }
5343                 offset += SCTP_SIZE32(plen);
5344                 phdr = sctp_get_next_param(in_initpkt, offset, &params, sizeof(params));
5345         }
5346         return (0);
5347 }
5348
5349 /*
5350  * Given a MBUF chain that was sent into us containing an INIT. Build a
5351  * INIT-ACK with COOKIE and send back. We assume that the in_initpkt has done
5352  * a pullup to include IPv6/4header, SCTP header and initial part of INIT
5353  * message (i.e. the struct sctp_init_msg).
5354  */
5355 void
5356 sctp_send_initiate_ack(struct sctp_inpcb *inp, struct sctp_tcb *stcb,
5357     struct mbuf *init_pkt, int iphlen, int offset,
5358     struct sockaddr *src, struct sockaddr *dst,
5359     struct sctphdr *sh, struct sctp_init_chunk *init_chk,
5360     uint8_t use_mflowid, uint32_t mflowid,
5361     uint32_t vrf_id, uint16_t port, int hold_inp_lock)
5362 {
5363         struct sctp_association *asoc;
5364         struct mbuf *m, *m_at, *m_tmp, *m_cookie, *op_err, *mp_last;
5365         struct sctp_init_ack_chunk *initack;
5366         struct sctp_adaptation_layer_indication *ali;
5367         struct sctp_ecn_supported_param *ecn;
5368         struct sctp_prsctp_supported_param *prsctp;
5369         struct sctp_supported_chunk_types_param *pr_supported;
5370         union sctp_sockstore *over_addr;
5371
5372 #ifdef INET
5373         struct sockaddr_in *dst4 = (struct sockaddr_in *)dst;
5374         struct sockaddr_in *src4 = (struct sockaddr_in *)src;
5375         struct sockaddr_in *sin;
5376
5377 #endif
5378 #ifdef INET6
5379         struct sockaddr_in6 *dst6 = (struct sockaddr_in6 *)dst;
5380         struct sockaddr_in6 *src6 = (struct sockaddr_in6 *)src;
5381         struct sockaddr_in6 *sin6;
5382
5383 #endif
5384         struct sockaddr *to;
5385         struct sctp_state_cookie stc;
5386         struct sctp_nets *net = NULL;
5387         uint8_t *signature = NULL;
5388         int cnt_inits_to = 0;
5389         uint16_t his_limit, i_want;
5390         int abort_flag, padval;
5391         int num_ext;
5392         int p_len;
5393         int nat_friendly = 0;
5394         struct socket *so;
5395
5396         if (stcb) {
5397                 asoc = &stcb->asoc;
5398         } else {
5399                 asoc = NULL;
5400         }
5401         mp_last = NULL;
5402         if ((asoc != NULL) &&
5403             (SCTP_GET_STATE(asoc) != SCTP_STATE_COOKIE_WAIT) &&
5404             (sctp_are_there_new_addresses(asoc, init_pkt, offset, src))) {
5405                 /* new addresses, out of here in non-cookie-wait states */
5406                 /*
5407                  * Send a ABORT, we don't add the new address error clause
5408                  * though we even set the T bit and copy in the 0 tag.. this
5409                  * looks no different than if no listener was present.
5410                  */
5411                 sctp_send_abort(init_pkt, iphlen, src, dst, sh, 0, NULL,
5412                     use_mflowid, mflowid,
5413                     vrf_id, port);
5414                 return;
5415         }
5416         abort_flag = 0;
5417         op_err = sctp_arethere_unrecognized_parameters(init_pkt,
5418             (offset + sizeof(struct sctp_init_chunk)),
5419             &abort_flag, (struct sctp_chunkhdr *)init_chk, &nat_friendly);
5420         if (abort_flag) {
5421 do_a_abort:
5422                 sctp_send_abort(init_pkt, iphlen, src, dst, sh,
5423                     init_chk->init.initiate_tag, op_err,
5424                     use_mflowid, mflowid,
5425                     vrf_id, port);
5426                 return;
5427         }
5428         m = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_DONTWAIT, 1, MT_DATA);
5429         if (m == NULL) {
5430                 /* No memory, INIT timer will re-attempt. */
5431                 if (op_err)
5432                         sctp_m_freem(op_err);
5433                 return;
5434         }
5435         SCTP_BUF_LEN(m) = sizeof(struct sctp_init_chunk);
5436
5437         /* the time I built cookie */
5438         (void)SCTP_GETTIME_TIMEVAL(&stc.time_entered);
5439
5440         /* populate any tie tags */
5441         if (asoc != NULL) {
5442                 /* unlock before tag selections */
5443                 stc.tie_tag_my_vtag = asoc->my_vtag_nonce;
5444                 stc.tie_tag_peer_vtag = asoc->peer_vtag_nonce;
5445                 stc.cookie_life = asoc->cookie_life;
5446                 net = asoc->primary_destination;
5447         } else {
5448                 stc.tie_tag_my_vtag = 0;
5449                 stc.tie_tag_peer_vtag = 0;
5450                 /* life I will award this cookie */
5451                 stc.cookie_life = inp->sctp_ep.def_cookie_life;
5452         }
5453
5454         /* copy in the ports for later check */
5455         stc.myport = sh->dest_port;
5456         stc.peerport = sh->src_port;
5457
5458         /*
5459          * If we wanted to honor cookie life extentions, we would add to
5460          * stc.cookie_life. For now we should NOT honor any extension
5461          */
5462         stc.site_scope = stc.local_scope = stc.loopback_scope = 0;
5463         if (inp->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
5464                 struct inpcb *in_inp;
5465
5466                 /* Its a V6 socket */
5467                 in_inp = (struct inpcb *)inp;
5468                 stc.ipv6_addr_legal = 1;
5469                 /* Now look at the binding flag to see if V4 will be legal */
5470                 if (SCTP_IPV6_V6ONLY(in_inp) == 0) {
5471                         stc.ipv4_addr_legal = 1;
5472                 } else {
5473                         /* V4 addresses are NOT legal on the association */
5474                         stc.ipv4_addr_legal = 0;
5475                 }
5476         } else {
5477                 /* Its a V4 socket, no - V6 */
5478                 stc.ipv4_addr_legal = 1;
5479                 stc.ipv6_addr_legal = 0;
5480         }
5481
5482 #ifdef SCTP_DONT_DO_PRIVADDR_SCOPE
5483         stc.ipv4_scope = 1;
5484 #else
5485         stc.ipv4_scope = 0;
5486 #endif
5487         if (net == NULL) {
5488                 to = src;
5489                 switch (dst->sa_family) {
5490 #ifdef INET
5491                 case AF_INET:
5492                         {
5493                                 /* lookup address */
5494                                 stc.address[0] = src4->sin_addr.s_addr;
5495                                 stc.address[1] = 0;
5496                                 stc.address[2] = 0;
5497                                 stc.address[3] = 0;
5498                                 stc.addr_type = SCTP_IPV4_ADDRESS;
5499                                 /* local from address */
5500                                 stc.laddress[0] = dst4->sin_addr.s_addr;
5501                                 stc.laddress[1] = 0;
5502                                 stc.laddress[2] = 0;
5503                                 stc.laddress[3] = 0;
5504                                 stc.laddr_type = SCTP_IPV4_ADDRESS;
5505                                 /* scope_id is only for v6 */
5506                                 stc.scope_id = 0;
5507 #ifndef SCTP_DONT_DO_PRIVADDR_SCOPE
5508                                 if (IN4_ISPRIVATE_ADDRESS(&src4->sin_addr)) {
5509                                         stc.ipv4_scope = 1;
5510                                 }
5511 #else
5512                                 stc.ipv4_scope = 1;
5513 #endif                          /* SCTP_DONT_DO_PRIVADDR_SCOPE */
5514                                 /* Must use the address in this case */
5515                                 if (sctp_is_address_on_local_host(src, vrf_id)) {
5516                                         stc.loopback_scope = 1;
5517                                         stc.ipv4_scope = 1;
5518                                         stc.site_scope = 1;
5519                                         stc.local_scope = 0;
5520                                 }
5521                                 break;
5522                         }
5523 #endif
5524 #ifdef INET6
5525                 case AF_INET6:
5526                         {
5527                                 stc.addr_type = SCTP_IPV6_ADDRESS;
5528                                 memcpy(&stc.address, &src6->sin6_addr, sizeof(struct in6_addr));
5529                                 stc.scope_id = in6_getscope(&src6->sin6_addr);
5530                                 if (sctp_is_address_on_local_host(src, vrf_id)) {
5531                                         stc.loopback_scope = 1;
5532                                         stc.local_scope = 0;
5533                                         stc.site_scope = 1;
5534                                         stc.ipv4_scope = 1;
5535                                 } else if (IN6_IS_ADDR_LINKLOCAL(&src6->sin6_addr)) {
5536                                         /*
5537                                          * If the new destination is a
5538                                          * LINK_LOCAL we must have common
5539                                          * both site and local scope. Don't
5540                                          * set local scope though since we
5541                                          * must depend on the source to be
5542                                          * added implicitly. We cannot
5543                                          * assure just because we share one
5544                                          * link that all links are common.
5545                                          */
5546                                         stc.local_scope = 0;
5547                                         stc.site_scope = 1;
5548                                         stc.ipv4_scope = 1;
5549                                         /*
5550                                          * we start counting for the private
5551                                          * address stuff at 1. since the
5552                                          * link local we source from won't
5553                                          * show up in our scoped count.
5554                                          */
5555                                         cnt_inits_to = 1;
5556                                         /*
5557                                          * pull out the scope_id from
5558                                          * incoming pkt
5559                                          */
5560                                 } else if (IN6_IS_ADDR_SITELOCAL(&src6->sin6_addr)) {
5561                                         /*
5562                                          * If the new destination is
5563                                          * SITE_LOCAL then we must have site
5564                                          * scope in common.
5565                                          */
5566                                         stc.site_scope = 1;
5567                                 }
5568                                 memcpy(&stc.laddress, &dst6->sin6_addr, sizeof(struct in6_addr));
5569                                 stc.laddr_type = SCTP_IPV6_ADDRESS;
5570                                 break;
5571                         }
5572 #endif
5573                 default:
5574                         /* TSNH */
5575                         goto do_a_abort;
5576                         break;
5577                 }
5578         } else {
5579                 /* set the scope per the existing tcb */
5580
5581 #ifdef INET6
5582                 struct sctp_nets *lnet;
5583
5584 #endif
5585
5586                 stc.loopback_scope = asoc->loopback_scope;
5587                 stc.ipv4_scope = asoc->ipv4_local_scope;
5588                 stc.site_scope = asoc->site_scope;
5589                 stc.local_scope = asoc->local_scope;
5590 #ifdef INET6
5591                 /* Why do we not consider IPv4 LL addresses? */
5592                 TAILQ_FOREACH(lnet, &asoc->nets, sctp_next) {
5593                         if (lnet->ro._l_addr.sin6.sin6_family == AF_INET6) {
5594                                 if (IN6_IS_ADDR_LINKLOCAL(&lnet->ro._l_addr.sin6.sin6_addr)) {
5595                                         /*
5596                                          * if we have a LL address, start
5597                                          * counting at 1.
5598                                          */
5599                                         cnt_inits_to = 1;
5600                                 }
5601                         }
5602                 }
5603 #endif
5604                 /* use the net pointer */
5605                 to = (struct sockaddr *)&net->ro._l_addr;
5606                 switch (to->sa_family) {
5607 #ifdef INET
5608                 case AF_INET:
5609                         sin = (struct sockaddr_in *)to;
5610                         stc.address[0] = sin->sin_addr.s_addr;
5611                         stc.address[1] = 0;
5612                         stc.address[2] = 0;
5613                         stc.address[3] = 0;
5614                         stc.addr_type = SCTP_IPV4_ADDRESS;
5615                         if (net->src_addr_selected == 0) {
5616                                 /*
5617                                  * strange case here, the INIT should have
5618                                  * did the selection.
5619                                  */
5620                                 net->ro._s_addr = sctp_source_address_selection(inp,
5621                                     stcb, (sctp_route_t *) & net->ro,
5622                                     net, 0, vrf_id);
5623                                 if (net->ro._s_addr == NULL)
5624                                         return;
5625
5626                                 net->src_addr_selected = 1;
5627
5628                         }
5629                         stc.laddress[0] = net->ro._s_addr->address.sin.sin_addr.s_addr;
5630                         stc.laddress[1] = 0;
5631                         stc.laddress[2] = 0;
5632                         stc.laddress[3] = 0;
5633                         stc.laddr_type = SCTP_IPV4_ADDRESS;
5634                         /* scope_id is only for v6 */
5635                         stc.scope_id = 0;
5636                         break;
5637 #endif
5638 #ifdef INET6
5639                 case AF_INET6:
5640                         sin6 = (struct sockaddr_in6 *)to;
5641                         memcpy(&stc.address, &sin6->sin6_addr,
5642                             sizeof(struct in6_addr));
5643                         stc.addr_type = SCTP_IPV6_ADDRESS;
5644                         stc.scope_id = sin6->sin6_scope_id;
5645                         if (net->src_addr_selected == 0) {
5646                                 /*
5647                                  * strange case here, the INIT should have
5648                                  * done the selection.
5649                                  */
5650                                 net->ro._s_addr = sctp_source_address_selection(inp,
5651                                     stcb, (sctp_route_t *) & net->ro,
5652                                     net, 0, vrf_id);
5653                                 if (net->ro._s_addr == NULL)
5654                                         return;
5655
5656                                 net->src_addr_selected = 1;
5657                         }
5658                         memcpy(&stc.laddress, &net->ro._s_addr->address.sin6.sin6_addr,
5659                             sizeof(struct in6_addr));
5660                         stc.laddr_type = SCTP_IPV6_ADDRESS;
5661                         break;
5662 #endif
5663                 }
5664         }
5665         /* Now lets put the SCTP header in place */
5666         initack = mtod(m, struct sctp_init_ack_chunk *);
5667         /* Save it off for quick ref */
5668         stc.peers_vtag = init_chk->init.initiate_tag;
5669         /* who are we */
5670         memcpy(stc.identification, SCTP_VERSION_STRING,
5671             min(strlen(SCTP_VERSION_STRING), sizeof(stc.identification)));
5672         memset(stc.reserved, 0, SCTP_RESERVE_SPACE);
5673         /* now the chunk header */
5674         initack->ch.chunk_type = SCTP_INITIATION_ACK;
5675         initack->ch.chunk_flags = 0;
5676         /* fill in later from mbuf we build */
5677         initack->ch.chunk_length = 0;
5678         /* place in my tag */
5679         if ((asoc != NULL) &&
5680             ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) ||
5681             (SCTP_GET_STATE(asoc) == SCTP_STATE_INUSE) ||
5682             (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED))) {
5683                 /* re-use the v-tags and init-seq here */
5684                 initack->init.initiate_tag = htonl(asoc->my_vtag);
5685                 initack->init.initial_tsn = htonl(asoc->init_seq_number);
5686         } else {
5687                 uint32_t vtag, itsn;
5688
5689                 if (hold_inp_lock) {
5690                         SCTP_INP_INCR_REF(inp);
5691                         SCTP_INP_RUNLOCK(inp);
5692                 }
5693                 if (asoc) {
5694                         atomic_add_int(&asoc->refcnt, 1);
5695                         SCTP_TCB_UNLOCK(stcb);
5696         new_tag:
5697                         vtag = sctp_select_a_tag(inp, inp->sctp_lport, sh->src_port, 1);
5698                         if ((asoc->peer_supports_nat) && (vtag == asoc->my_vtag)) {
5699                                 /*
5700                                  * Got a duplicate vtag on some guy behind a
5701                                  * nat make sure we don't use it.
5702                                  */
5703                                 goto new_tag;
5704                         }
5705                         initack->init.initiate_tag = htonl(vtag);
5706                         /* get a TSN to use too */
5707                         itsn = sctp_select_initial_TSN(&inp->sctp_ep);
5708                         initack->init.initial_tsn = htonl(itsn);
5709                         SCTP_TCB_LOCK(stcb);
5710                         atomic_add_int(&asoc->refcnt, -1);
5711                 } else {
5712                         vtag = sctp_select_a_tag(inp, inp->sctp_lport, sh->src_port, 1);
5713                         initack->init.initiate_tag = htonl(vtag);
5714                         /* get a TSN to use too */
5715                         initack->init.initial_tsn = htonl(sctp_select_initial_TSN(&inp->sctp_ep));
5716                 }
5717                 if (hold_inp_lock) {
5718                         SCTP_INP_RLOCK(inp);
5719                         SCTP_INP_DECR_REF(inp);
5720                 }
5721         }
5722         /* save away my tag to */
5723         stc.my_vtag = initack->init.initiate_tag;
5724
5725         /* set up some of the credits. */
5726         so = inp->sctp_socket;
5727         if (so == NULL) {
5728                 /* memory problem */
5729                 sctp_m_freem(m);
5730                 return;
5731         } else {
5732                 initack->init.a_rwnd = htonl(max(SCTP_SB_LIMIT_RCV(so), SCTP_MINIMAL_RWND));
5733         }
5734         /* set what I want */
5735         his_limit = ntohs(init_chk->init.num_inbound_streams);
5736         /* choose what I want */
5737         if (asoc != NULL) {
5738                 if (asoc->streamoutcnt > inp->sctp_ep.pre_open_stream_count) {
5739                         i_want = asoc->streamoutcnt;
5740                 } else {
5741                         i_want = inp->sctp_ep.pre_open_stream_count;
5742                 }
5743         } else {
5744                 i_want = inp->sctp_ep.pre_open_stream_count;
5745         }
5746         if (his_limit < i_want) {
5747                 /* I Want more :< */
5748                 initack->init.num_outbound_streams = init_chk->init.num_inbound_streams;
5749         } else {
5750                 /* I can have what I want :> */
5751                 initack->init.num_outbound_streams = htons(i_want);
5752         }
5753         /* tell him his limt. */
5754         initack->init.num_inbound_streams =
5755             htons(inp->sctp_ep.max_open_streams_intome);
5756
5757         /* adaptation layer indication parameter */
5758         ali = (struct sctp_adaptation_layer_indication *)((caddr_t)initack + sizeof(*initack));
5759         ali->ph.param_type = htons(SCTP_ULP_ADAPTATION);
5760         ali->ph.param_length = htons(sizeof(*ali));
5761         ali->indication = ntohl(inp->sctp_ep.adaptation_layer_indicator);
5762         SCTP_BUF_LEN(m) += sizeof(*ali);
5763         ecn = (struct sctp_ecn_supported_param *)((caddr_t)ali + sizeof(*ali));
5764
5765         /* ECN parameter */
5766         if (((asoc != NULL) && (asoc->ecn_allowed == 1)) ||
5767             (inp->sctp_ecn_enable == 1)) {
5768                 ecn->ph.param_type = htons(SCTP_ECN_CAPABLE);
5769                 ecn->ph.param_length = htons(sizeof(*ecn));
5770                 SCTP_BUF_LEN(m) += sizeof(*ecn);
5771
5772                 prsctp = (struct sctp_prsctp_supported_param *)((caddr_t)ecn +
5773                     sizeof(*ecn));
5774         } else {
5775                 prsctp = (struct sctp_prsctp_supported_param *)((caddr_t)ecn);
5776         }
5777         /* And now tell the peer we do  pr-sctp */
5778         prsctp->ph.param_type = htons(SCTP_PRSCTP_SUPPORTED);
5779         prsctp->ph.param_length = htons(sizeof(*prsctp));
5780         SCTP_BUF_LEN(m) += sizeof(*prsctp);
5781         if (nat_friendly) {
5782                 /* Add NAT friendly parameter */
5783                 struct sctp_paramhdr *ph;
5784
5785                 ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+SCTP_BUF_LEN(m));
5786                 ph->param_type = htons(SCTP_HAS_NAT_SUPPORT);
5787                 ph->param_length = htons(sizeof(struct sctp_paramhdr));
5788                 SCTP_BUF_LEN(m) += sizeof(struct sctp_paramhdr);
5789         }
5790         /* And now tell the peer we do all the extensions */
5791         pr_supported = (struct sctp_supported_chunk_types_param *)(mtod(m, caddr_t)+SCTP_BUF_LEN(m));
5792         pr_supported->ph.param_type = htons(SCTP_SUPPORTED_CHUNK_EXT);
5793         num_ext = 0;
5794         pr_supported->chunk_types[num_ext++] = SCTP_ASCONF;
5795         pr_supported->chunk_types[num_ext++] = SCTP_ASCONF_ACK;
5796         pr_supported->chunk_types[num_ext++] = SCTP_FORWARD_CUM_TSN;
5797         pr_supported->chunk_types[num_ext++] = SCTP_PACKET_DROPPED;
5798         pr_supported->chunk_types[num_ext++] = SCTP_STREAM_RESET;
5799         if (!SCTP_BASE_SYSCTL(sctp_auth_disable))
5800                 pr_supported->chunk_types[num_ext++] = SCTP_AUTHENTICATION;
5801         if (SCTP_BASE_SYSCTL(sctp_nr_sack_on_off))
5802                 pr_supported->chunk_types[num_ext++] = SCTP_NR_SELECTIVE_ACK;
5803         p_len = sizeof(*pr_supported) + num_ext;
5804         pr_supported->ph.param_length = htons(p_len);
5805         bzero((caddr_t)pr_supported + p_len, SCTP_SIZE32(p_len) - p_len);
5806         SCTP_BUF_LEN(m) += SCTP_SIZE32(p_len);
5807
5808         /* add authentication parameters */
5809         if (!SCTP_BASE_SYSCTL(sctp_auth_disable)) {
5810                 struct sctp_auth_random *randp;
5811                 struct sctp_auth_hmac_algo *hmacs;
5812                 struct sctp_auth_chunk_list *chunks;
5813                 uint16_t random_len;
5814
5815                 /* generate and add RANDOM parameter */
5816                 random_len = SCTP_AUTH_RANDOM_SIZE_DEFAULT;
5817                 randp = (struct sctp_auth_random *)(mtod(m, caddr_t)+SCTP_BUF_LEN(m));
5818                 randp->ph.param_type = htons(SCTP_RANDOM);
5819                 p_len = sizeof(*randp) + random_len;
5820                 randp->ph.param_length = htons(p_len);
5821                 SCTP_READ_RANDOM(randp->random_data, random_len);
5822                 /* zero out any padding required */
5823                 bzero((caddr_t)randp + p_len, SCTP_SIZE32(p_len) - p_len);
5824                 SCTP_BUF_LEN(m) += SCTP_SIZE32(p_len);
5825
5826                 /* add HMAC_ALGO parameter */
5827                 hmacs = (struct sctp_auth_hmac_algo *)(mtod(m, caddr_t)+SCTP_BUF_LEN(m));
5828                 p_len = sctp_serialize_hmaclist(inp->sctp_ep.local_hmacs,
5829                     (uint8_t *) hmacs->hmac_ids);
5830                 if (p_len > 0) {
5831                         p_len += sizeof(*hmacs);
5832                         hmacs->ph.param_type = htons(SCTP_HMAC_LIST);
5833                         hmacs->ph.param_length = htons(p_len);
5834                         /* zero out any padding required */
5835                         bzero((caddr_t)hmacs + p_len, SCTP_SIZE32(p_len) - p_len);
5836                         SCTP_BUF_LEN(m) += SCTP_SIZE32(p_len);
5837                 }
5838                 /* add CHUNKS parameter */
5839                 chunks = (struct sctp_auth_chunk_list *)(mtod(m, caddr_t)+SCTP_BUF_LEN(m));
5840                 p_len = sctp_serialize_auth_chunks(inp->sctp_ep.local_auth_chunks,
5841                     chunks->chunk_types);
5842                 if (p_len > 0) {
5843                         p_len += sizeof(*chunks);
5844                         chunks->ph.param_type = htons(SCTP_CHUNK_LIST);
5845                         chunks->ph.param_length = htons(p_len);
5846                         /* zero out any padding required */
5847                         bzero((caddr_t)chunks + p_len, SCTP_SIZE32(p_len) - p_len);
5848                         SCTP_BUF_LEN(m) += SCTP_SIZE32(p_len);
5849                 }
5850         }
5851         m_at = m;
5852         /* now the addresses */
5853         {
5854                 struct sctp_scoping scp;
5855
5856                 /*
5857                  * To optimize this we could put the scoping stuff into a
5858                  * structure and remove the individual uint8's from the stc
5859                  * structure. Then we could just sifa in the address within
5860                  * the stc.. but for now this is a quick hack to get the
5861                  * address stuff teased apart.
5862                  */
5863                 scp.ipv4_addr_legal = stc.ipv4_addr_legal;
5864                 scp.ipv6_addr_legal = stc.ipv6_addr_legal;
5865                 scp.loopback_scope = stc.loopback_scope;
5866                 scp.ipv4_local_scope = stc.ipv4_scope;
5867                 scp.local_scope = stc.local_scope;
5868                 scp.site_scope = stc.site_scope;
5869                 m_at = sctp_add_addresses_to_i_ia(inp, stcb, &scp, m_at, cnt_inits_to);
5870         }
5871
5872         /* tack on the operational error if present */
5873         if (op_err) {
5874                 struct mbuf *ol;
5875                 int llen;
5876
5877                 llen = 0;
5878                 ol = op_err;
5879
5880                 while (ol) {
5881                         llen += SCTP_BUF_LEN(ol);
5882                         ol = SCTP_BUF_NEXT(ol);
5883                 }
5884                 if (llen % 4) {
5885                         /* must add a pad to the param */
5886                         uint32_t cpthis = 0;
5887                         int padlen;
5888
5889                         padlen = 4 - (llen % 4);
5890                         m_copyback(op_err, llen, padlen, (caddr_t)&cpthis);
5891                 }
5892                 while (SCTP_BUF_NEXT(m_at) != NULL) {
5893                         m_at = SCTP_BUF_NEXT(m_at);
5894                 }
5895                 SCTP_BUF_NEXT(m_at) = op_err;
5896                 while (SCTP_BUF_NEXT(m_at) != NULL) {
5897                         m_at = SCTP_BUF_NEXT(m_at);
5898                 }
5899         }
5900         /* pre-calulate the size and update pkt header and chunk header */
5901         p_len = 0;
5902         for (m_tmp = m; m_tmp; m_tmp = SCTP_BUF_NEXT(m_tmp)) {
5903                 p_len += SCTP_BUF_LEN(m_tmp);
5904                 if (SCTP_BUF_NEXT(m_tmp) == NULL) {
5905                         /* m_tmp should now point to last one */
5906                         break;
5907                 }
5908         }
5909
5910         /* Now we must build a cookie */
5911         m_cookie = sctp_add_cookie(init_pkt, offset, m, 0, &stc, &signature);
5912         if (m_cookie == NULL) {
5913                 /* memory problem */
5914                 sctp_m_freem(m);
5915                 return;
5916         }
5917         /* Now append the cookie to the end and update the space/size */
5918         SCTP_BUF_NEXT(m_tmp) = m_cookie;
5919
5920         for (m_tmp = m_cookie; m_tmp; m_tmp = SCTP_BUF_NEXT(m_tmp)) {
5921                 p_len += SCTP_BUF_LEN(m_tmp);
5922                 if (SCTP_BUF_NEXT(m_tmp) == NULL) {
5923                         /* m_tmp should now point to last one */
5924                         mp_last = m_tmp;
5925                         break;
5926                 }
5927         }
5928         /*
5929          * Place in the size, but we don't include the last pad (if any) in
5930          * the INIT-ACK.
5931          */
5932         initack->ch.chunk_length = htons(p_len);
5933
5934         /*
5935          * Time to sign the cookie, we don't sign over the cookie signature
5936          * though thus we set trailer.
5937          */
5938         (void)sctp_hmac_m(SCTP_HMAC,
5939             (uint8_t *) inp->sctp_ep.secret_key[(int)(inp->sctp_ep.current_secret_number)],
5940             SCTP_SECRET_SIZE, m_cookie, sizeof(struct sctp_paramhdr),
5941             (uint8_t *) signature, SCTP_SIGNATURE_SIZE);
5942         /*
5943          * We sifa 0 here to NOT set IP_DF if its IPv4, we ignore the return
5944          * here since the timer will drive a retranmission.
5945          */
5946         padval = p_len % 4;
5947         if ((padval) && (mp_last)) {
5948                 /* see my previous comments on mp_last */
5949                 if (sctp_add_pad_tombuf(mp_last, (4 - padval))) {
5950                         /* Houston we have a problem, no space */
5951                         sctp_m_freem(m);
5952                         return;
5953                 }
5954         }
5955         if (stc.loopback_scope) {
5956                 over_addr = (union sctp_sockstore *)dst;
5957         } else {
5958                 over_addr = NULL;
5959         }
5960
5961         (void)sctp_lowlevel_chunk_output(inp, NULL, NULL, to, m, 0, NULL, 0, 0,
5962             0, 0,
5963             inp->sctp_lport, sh->src_port, init_chk->init.initiate_tag,
5964             port, over_addr,
5965             use_mflowid, mflowid,
5966             SCTP_SO_NOT_LOCKED);
5967         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
5968 }
5969
5970
5971 static void
5972 sctp_prune_prsctp(struct sctp_tcb *stcb,
5973     struct sctp_association *asoc,
5974     struct sctp_sndrcvinfo *srcv,
5975     int dataout)
5976 {
5977         int freed_spc = 0;
5978         struct sctp_tmit_chunk *chk, *nchk;
5979
5980         SCTP_TCB_LOCK_ASSERT(stcb);
5981         if ((asoc->peer_supports_prsctp) &&
5982             (asoc->sent_queue_cnt_removeable > 0)) {
5983                 TAILQ_FOREACH(chk, &asoc->sent_queue, sctp_next) {
5984                         /*
5985                          * Look for chunks marked with the PR_SCTP flag AND
5986                          * the buffer space flag. If the one being sent is
5987                          * equal or greater priority then purge the old one
5988                          * and free some space.
5989                          */
5990                         if (PR_SCTP_BUF_ENABLED(chk->flags)) {
5991                                 /*
5992                                  * This one is PR-SCTP AND buffer space
5993                                  * limited type
5994                                  */
5995                                 if (chk->rec.data.timetodrop.tv_sec >= (long)srcv->sinfo_timetolive) {
5996                                         /*
5997                                          * Lower numbers equates to higher
5998                                          * priority so if the one we are
5999                                          * looking at has a larger or equal
6000                                          * priority we want to drop the data
6001                                          * and NOT retransmit it.
6002                                          */
6003                                         if (chk->data) {
6004                                                 /*
6005                                                  * We release the book_size
6006                                                  * if the mbuf is here
6007                                                  */
6008                                                 int ret_spc;
6009                                                 uint8_t sent;
6010
6011                                                 if (chk->sent > SCTP_DATAGRAM_UNSENT)
6012                                                         sent = 1;
6013                                                 else
6014                                                         sent = 0;
6015                                                 ret_spc = sctp_release_pr_sctp_chunk(stcb, chk,
6016                                                     sent,
6017                                                     SCTP_SO_LOCKED);
6018                                                 freed_spc += ret_spc;
6019                                                 if (freed_spc >= dataout) {
6020                                                         return;
6021                                                 }
6022                                         }       /* if chunk was present */
6023                                 }       /* if of sufficent priority */
6024                         }       /* if chunk has enabled */
6025                 }               /* tailqforeach */
6026
6027                 TAILQ_FOREACH_SAFE(chk, &asoc->send_queue, sctp_next, nchk) {
6028                         /* Here we must move to the sent queue and mark */
6029                         if (PR_SCTP_BUF_ENABLED(chk->flags)) {
6030                                 if (chk->rec.data.timetodrop.tv_sec >= (long)srcv->sinfo_timetolive) {
6031                                         if (chk->data) {
6032                                                 /*
6033                                                  * We release the book_size
6034                                                  * if the mbuf is here
6035                                                  */
6036                                                 int ret_spc;
6037
6038                                                 ret_spc = sctp_release_pr_sctp_chunk(stcb, chk,
6039                                                     0, SCTP_SO_LOCKED);
6040
6041                                                 freed_spc += ret_spc;
6042                                                 if (freed_spc >= dataout) {
6043                                                         return;
6044                                                 }
6045                                         }       /* end if chk->data */
6046                                 }       /* end if right class */
6047                         }       /* end if chk pr-sctp */
6048                 }               /* tailqforeachsafe (chk) */
6049         }                       /* if enabled in asoc */
6050 }
6051
6052 int
6053 sctp_get_frag_point(struct sctp_tcb *stcb,
6054     struct sctp_association *asoc)
6055 {
6056         int siz, ovh;
6057
6058         /*
6059          * For endpoints that have both v6 and v4 addresses we must reserve
6060          * room for the ipv6 header, for those that are only dealing with V4
6061          * we use a larger frag point.
6062          */
6063         if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
6064                 ovh = SCTP_MED_OVERHEAD;
6065         } else {
6066                 ovh = SCTP_MED_V4_OVERHEAD;
6067         }
6068
6069         if (stcb->asoc.sctp_frag_point > asoc->smallest_mtu)
6070                 siz = asoc->smallest_mtu - ovh;
6071         else
6072                 siz = (stcb->asoc.sctp_frag_point - ovh);
6073         /*
6074          * if (siz > (MCLBYTES-sizeof(struct sctp_data_chunk))) {
6075          */
6076         /* A data chunk MUST fit in a cluster */
6077         /* siz = (MCLBYTES - sizeof(struct sctp_data_chunk)); */
6078         /* } */
6079
6080         /* adjust for an AUTH chunk if DATA requires auth */
6081         if (sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks))
6082                 siz -= sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
6083
6084         if (siz % 4) {
6085                 /* make it an even word boundary please */
6086                 siz -= (siz % 4);
6087         }
6088         return (siz);
6089 }
6090
6091 static void
6092 sctp_set_prsctp_policy(struct sctp_stream_queue_pending *sp)
6093 {
6094         sp->pr_sctp_on = 0;
6095         /*
6096          * We assume that the user wants PR_SCTP_TTL if the user provides a
6097          * positive lifetime but does not specify any PR_SCTP policy. This
6098          * is a BAD assumption and causes problems at least with the
6099          * U-Vancovers MPI folks. I will change this to be no policy means
6100          * NO PR-SCTP.
6101          */
6102         if (PR_SCTP_ENABLED(sp->sinfo_flags)) {
6103                 sp->act_flags |= PR_SCTP_POLICY(sp->sinfo_flags);
6104                 sp->pr_sctp_on = 1;
6105         } else {
6106                 return;
6107         }
6108         switch (PR_SCTP_POLICY(sp->sinfo_flags)) {
6109         case CHUNK_FLAGS_PR_SCTP_BUF:
6110                 /*
6111                  * Time to live is a priority stored in tv_sec when doing
6112                  * the buffer drop thing.
6113                  */
6114                 sp->ts.tv_sec = sp->timetolive;
6115                 sp->ts.tv_usec = 0;
6116                 break;
6117         case CHUNK_FLAGS_PR_SCTP_TTL:
6118                 {
6119                         struct timeval tv;
6120
6121                         (void)SCTP_GETTIME_TIMEVAL(&sp->ts);
6122                         tv.tv_sec = sp->timetolive / 1000;
6123                         tv.tv_usec = (sp->timetolive * 1000) % 1000000;
6124                         /*
6125                          * TODO sctp_constants.h needs alternative time
6126                          * macros when _KERNEL is undefined.
6127                          */
6128                         timevaladd(&sp->ts, &tv);
6129                 }
6130                 break;
6131         case CHUNK_FLAGS_PR_SCTP_RTX:
6132                 /*
6133                  * Time to live is a the number or retransmissions stored in
6134                  * tv_sec.
6135                  */
6136                 sp->ts.tv_sec = sp->timetolive;
6137                 sp->ts.tv_usec = 0;
6138                 break;
6139         default:
6140                 SCTPDBG(SCTP_DEBUG_USRREQ1,
6141                     "Unknown PR_SCTP policy %u.\n",
6142                     PR_SCTP_POLICY(sp->sinfo_flags));
6143                 break;
6144         }
6145 }
6146
6147 static int
6148 sctp_msg_append(struct sctp_tcb *stcb,
6149     struct sctp_nets *net,
6150     struct mbuf *m,
6151     struct sctp_sndrcvinfo *srcv, int hold_stcb_lock)
6152 {
6153         int error = 0;
6154         struct mbuf *at;
6155         struct sctp_stream_queue_pending *sp = NULL;
6156         struct sctp_stream_out *strm;
6157
6158         /*
6159          * Given an mbuf chain, put it into the association send queue and
6160          * place it on the wheel
6161          */
6162         if (srcv->sinfo_stream >= stcb->asoc.streamoutcnt) {
6163                 /* Invalid stream number */
6164                 SCTP_LTRACE_ERR_RET_PKT(m, NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
6165                 error = EINVAL;
6166                 goto out_now;
6167         }
6168         if ((stcb->asoc.stream_locked) &&
6169             (stcb->asoc.stream_locked_on != srcv->sinfo_stream)) {
6170                 SCTP_LTRACE_ERR_RET_PKT(m, NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
6171                 error = EINVAL;
6172                 goto out_now;
6173         }
6174         strm = &stcb->asoc.strmout[srcv->sinfo_stream];
6175         /* Now can we send this? */
6176         if ((SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_SENT) ||
6177             (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) ||
6178             (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_RECEIVED) ||
6179             (stcb->asoc.state & SCTP_STATE_SHUTDOWN_PENDING)) {
6180                 /* got data while shutting down */
6181                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
6182                 error = ECONNRESET;
6183                 goto out_now;
6184         }
6185         sctp_alloc_a_strmoq(stcb, sp);
6186         if (sp == NULL) {
6187                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
6188                 error = ENOMEM;
6189                 goto out_now;
6190         }
6191         sp->sinfo_flags = srcv->sinfo_flags;
6192         sp->timetolive = srcv->sinfo_timetolive;
6193         sp->ppid = srcv->sinfo_ppid;
6194         sp->context = srcv->sinfo_context;
6195         sp->strseq = 0;
6196         if (sp->sinfo_flags & SCTP_ADDR_OVER) {
6197                 sp->net = net;
6198                 atomic_add_int(&sp->net->ref_count, 1);
6199         } else {
6200                 sp->net = NULL;
6201         }
6202         (void)SCTP_GETTIME_TIMEVAL(&sp->ts);
6203         sp->stream = srcv->sinfo_stream;
6204         sp->msg_is_complete = 1;
6205         sp->sender_all_done = 1;
6206         sp->some_taken = 0;
6207         sp->data = m;
6208         sp->tail_mbuf = NULL;
6209         sctp_set_prsctp_policy(sp);
6210         /*
6211          * We could in theory (for sendall) sifa the length in, but we would
6212          * still have to hunt through the chain since we need to setup the
6213          * tail_mbuf
6214          */
6215         sp->length = 0;
6216         for (at = m; at; at = SCTP_BUF_NEXT(at)) {
6217                 if (SCTP_BUF_NEXT(at) == NULL)
6218                         sp->tail_mbuf = at;
6219                 sp->length += SCTP_BUF_LEN(at);
6220         }
6221         if (srcv->sinfo_keynumber_valid) {
6222                 sp->auth_keyid = srcv->sinfo_keynumber;
6223         } else {
6224                 sp->auth_keyid = stcb->asoc.authinfo.active_keyid;
6225         }
6226         if (sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks)) {
6227                 sctp_auth_key_acquire(stcb, sp->auth_keyid);
6228                 sp->holds_key_ref = 1;
6229         }
6230         if (hold_stcb_lock == 0) {
6231                 SCTP_TCB_SEND_LOCK(stcb);
6232         }
6233         sctp_snd_sb_alloc(stcb, sp->length);
6234         atomic_add_int(&stcb->asoc.stream_queue_cnt, 1);
6235         TAILQ_INSERT_TAIL(&strm->outqueue, sp, next);
6236         if ((srcv->sinfo_flags & SCTP_UNORDERED) == 0) {
6237                 sp->strseq = strm->next_sequence_sent;
6238                 strm->next_sequence_sent++;
6239         }
6240         stcb->asoc.ss_functions.sctp_ss_add_to_stream(stcb, &stcb->asoc, strm, sp, 1);
6241         m = NULL;
6242         if (hold_stcb_lock == 0) {
6243                 SCTP_TCB_SEND_UNLOCK(stcb);
6244         }
6245 out_now:
6246         if (m) {
6247                 sctp_m_freem(m);
6248         }
6249         return (error);
6250 }
6251
6252
6253 static struct mbuf *
6254 sctp_copy_mbufchain(struct mbuf *clonechain,
6255     struct mbuf *outchain,
6256     struct mbuf **endofchain,
6257     int can_take_mbuf,
6258     int sizeofcpy,
6259     uint8_t copy_by_ref)
6260 {
6261         struct mbuf *m;
6262         struct mbuf *appendchain;
6263         caddr_t cp;
6264         int len;
6265
6266         if (endofchain == NULL) {
6267                 /* error */
6268 error_out:
6269                 if (outchain)
6270                         sctp_m_freem(outchain);
6271                 return (NULL);
6272         }
6273         if (can_take_mbuf) {
6274                 appendchain = clonechain;
6275         } else {
6276                 if (!copy_by_ref &&
6277                     (sizeofcpy <= (int)((((SCTP_BASE_SYSCTL(sctp_mbuf_threshold_count) - 1) * MLEN) + MHLEN)))
6278                     ) {
6279                         /* Its not in a cluster */
6280                         if (*endofchain == NULL) {
6281                                 /* lets get a mbuf cluster */
6282                                 if (outchain == NULL) {
6283                                         /* This is the general case */
6284                         new_mbuf:
6285                                         outchain = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_DONTWAIT, 1, MT_HEADER);
6286                                         if (outchain == NULL) {
6287                                                 goto error_out;
6288                                         }
6289                                         SCTP_BUF_LEN(outchain) = 0;
6290                                         *endofchain = outchain;
6291                                         /* get the prepend space */
6292                                         SCTP_BUF_RESV_UF(outchain, (SCTP_FIRST_MBUF_RESV + 4));
6293                                 } else {
6294                                         /*
6295                                          * We really should not get a NULL
6296                                          * in endofchain
6297                                          */
6298                                         /* find end */
6299                                         m = outchain;
6300                                         while (m) {
6301                                                 if (SCTP_BUF_NEXT(m) == NULL) {
6302                                                         *endofchain = m;
6303                                                         break;
6304                                                 }
6305                                                 m = SCTP_BUF_NEXT(m);
6306                                         }
6307                                         /* sanity */
6308                                         if (*endofchain == NULL) {
6309                                                 /*
6310                                                  * huh, TSNH XXX maybe we
6311                                                  * should panic
6312                                                  */
6313                                                 sctp_m_freem(outchain);
6314                                                 goto new_mbuf;
6315                                         }
6316                                 }
6317                                 /* get the new end of length */
6318                                 len = M_TRAILINGSPACE(*endofchain);
6319                         } else {
6320                                 /* how much is left at the end? */
6321                                 len = M_TRAILINGSPACE(*endofchain);
6322                         }
6323                         /* Find the end of the data, for appending */
6324                         cp = (mtod((*endofchain), caddr_t)+SCTP_BUF_LEN((*endofchain)));
6325
6326                         /* Now lets copy it out */
6327                         if (len >= sizeofcpy) {
6328                                 /* It all fits, copy it in */
6329                                 m_copydata(clonechain, 0, sizeofcpy, cp);
6330                                 SCTP_BUF_LEN((*endofchain)) += sizeofcpy;
6331                         } else {
6332                                 /* fill up the end of the chain */
6333                                 if (len > 0) {
6334                                         m_copydata(clonechain, 0, len, cp);
6335                                         SCTP_BUF_LEN((*endofchain)) += len;
6336                                         /* now we need another one */
6337                                         sizeofcpy -= len;
6338                                 }
6339                                 m = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_DONTWAIT, 1, MT_HEADER);
6340                                 if (m == NULL) {
6341                                         /* We failed */
6342                                         goto error_out;
6343                                 }
6344                                 SCTP_BUF_NEXT((*endofchain)) = m;
6345                                 *endofchain = m;
6346                                 cp = mtod((*endofchain), caddr_t);
6347                                 m_copydata(clonechain, len, sizeofcpy, cp);
6348                                 SCTP_BUF_LEN((*endofchain)) += sizeofcpy;
6349                         }
6350                         return (outchain);
6351                 } else {
6352                         /* copy the old fashion way */
6353                         appendchain = SCTP_M_COPYM(clonechain, 0, M_COPYALL, M_DONTWAIT);
6354 #ifdef SCTP_MBUF_LOGGING
6355                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
6356                                 struct mbuf *mat;
6357
6358                                 for (mat = appendchain; mat; mat = SCTP_BUF_NEXT(mat)) {
6359                                         if (SCTP_BUF_IS_EXTENDED(mat)) {
6360                                                 sctp_log_mb(mat, SCTP_MBUF_ICOPY);
6361                                         }
6362                                 }
6363                         }
6364 #endif
6365                 }
6366         }
6367         if (appendchain == NULL) {
6368                 /* error */
6369                 if (outchain)
6370                         sctp_m_freem(outchain);
6371                 return (NULL);
6372         }
6373         if (outchain) {
6374                 /* tack on to the end */
6375                 if (*endofchain != NULL) {
6376                         SCTP_BUF_NEXT(((*endofchain))) = appendchain;
6377                 } else {
6378                         m = outchain;
6379                         while (m) {
6380                                 if (SCTP_BUF_NEXT(m) == NULL) {
6381                                         SCTP_BUF_NEXT(m) = appendchain;
6382                                         break;
6383                                 }
6384                                 m = SCTP_BUF_NEXT(m);
6385                         }
6386                 }
6387                 /*
6388                  * save off the end and update the end-chain postion
6389                  */
6390                 m = appendchain;
6391                 while (m) {
6392                         if (SCTP_BUF_NEXT(m) == NULL) {
6393                                 *endofchain = m;
6394                                 break;
6395                         }
6396                         m = SCTP_BUF_NEXT(m);
6397                 }
6398                 return (outchain);
6399         } else {
6400                 /* save off the end and update the end-chain postion */
6401                 m = appendchain;
6402                 while (m) {
6403                         if (SCTP_BUF_NEXT(m) == NULL) {
6404                                 *endofchain = m;
6405                                 break;
6406                         }
6407                         m = SCTP_BUF_NEXT(m);
6408                 }
6409                 return (appendchain);
6410         }
6411 }
6412
6413 int
6414 sctp_med_chunk_output(struct sctp_inpcb *inp,
6415     struct sctp_tcb *stcb,
6416     struct sctp_association *asoc,
6417     int *num_out,
6418     int *reason_code,
6419     int control_only, int from_where,
6420     struct timeval *now, int *now_filled, int frag_point, int so_locked
6421 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
6422     SCTP_UNUSED
6423 #endif
6424 );
6425
6426 static void
6427 sctp_sendall_iterator(struct sctp_inpcb *inp, struct sctp_tcb *stcb, void *ptr,
6428     uint32_t val SCTP_UNUSED)
6429 {
6430         struct sctp_copy_all *ca;
6431         struct mbuf *m;
6432         int ret = 0;
6433         int added_control = 0;
6434         int un_sent, do_chunk_output = 1;
6435         struct sctp_association *asoc;
6436         struct sctp_nets *net;
6437
6438         ca = (struct sctp_copy_all *)ptr;
6439         if (ca->m == NULL) {
6440                 return;
6441         }
6442         if (ca->inp != inp) {
6443                 /* TSNH */
6444                 return;
6445         }
6446         if ((ca->m) && ca->sndlen) {
6447                 m = SCTP_M_COPYM(ca->m, 0, M_COPYALL, M_DONTWAIT);
6448                 if (m == NULL) {
6449                         /* can't copy so we are done */
6450                         ca->cnt_failed++;
6451                         return;
6452                 }
6453 #ifdef SCTP_MBUF_LOGGING
6454                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
6455                         struct mbuf *mat;
6456
6457                         for (mat = m; mat; mat = SCTP_BUF_NEXT(mat)) {
6458                                 if (SCTP_BUF_IS_EXTENDED(mat)) {
6459                                         sctp_log_mb(mat, SCTP_MBUF_ICOPY);
6460                                 }
6461                         }
6462                 }
6463 #endif
6464         } else {
6465                 m = NULL;
6466         }
6467         SCTP_TCB_LOCK_ASSERT(stcb);
6468         if (stcb->asoc.alternate) {
6469                 net = stcb->asoc.alternate;
6470         } else {
6471                 net = stcb->asoc.primary_destination;
6472         }
6473         if (ca->sndrcv.sinfo_flags & SCTP_ABORT) {
6474                 /* Abort this assoc with m as the user defined reason */
6475                 if (m) {
6476                         struct sctp_paramhdr *ph;
6477
6478                         SCTP_BUF_PREPEND(m, sizeof(struct sctp_paramhdr), M_DONTWAIT);
6479                         if (m) {
6480                                 ph = mtod(m, struct sctp_paramhdr *);
6481                                 ph->param_type = htons(SCTP_CAUSE_USER_INITIATED_ABT);
6482                                 ph->param_length = htons(ca->sndlen);
6483                         }
6484                         /*
6485                          * We add one here to keep the assoc from
6486                          * dis-appearing on us.
6487                          */
6488                         atomic_add_int(&stcb->asoc.refcnt, 1);
6489                         sctp_abort_an_association(inp, stcb, m, SCTP_SO_NOT_LOCKED);
6490                         /*
6491                          * sctp_abort_an_association calls sctp_free_asoc()
6492                          * free association will NOT free it since we
6493                          * incremented the refcnt .. we do this to prevent
6494                          * it being freed and things getting tricky since we
6495                          * could end up (from free_asoc) calling inpcb_free
6496                          * which would get a recursive lock call to the
6497                          * iterator lock.. But as a consequence of that the
6498                          * stcb will return to us un-locked.. since
6499                          * free_asoc returns with either no TCB or the TCB
6500                          * unlocked, we must relock.. to unlock in the
6501                          * iterator timer :-0
6502                          */
6503                         SCTP_TCB_LOCK(stcb);
6504                         atomic_add_int(&stcb->asoc.refcnt, -1);
6505                         goto no_chunk_output;
6506                 }
6507         } else {
6508                 if (m) {
6509                         ret = sctp_msg_append(stcb, net, m,
6510                             &ca->sndrcv, 1);
6511                 }
6512                 asoc = &stcb->asoc;
6513                 if (ca->sndrcv.sinfo_flags & SCTP_EOF) {
6514                         /* shutdown this assoc */
6515                         int cnt;
6516
6517                         cnt = sctp_is_there_unsent_data(stcb, SCTP_SO_NOT_LOCKED);
6518
6519                         if (TAILQ_EMPTY(&asoc->send_queue) &&
6520                             TAILQ_EMPTY(&asoc->sent_queue) &&
6521                             (cnt == 0)) {
6522                                 if (asoc->locked_on_sending) {
6523                                         goto abort_anyway;
6524                                 }
6525                                 /*
6526                                  * there is nothing queued to send, so I'm
6527                                  * done...
6528                                  */
6529                                 if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) &&
6530                                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
6531                                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
6532                                         /*
6533                                          * only send SHUTDOWN the first time
6534                                          * through
6535                                          */
6536                                         sctp_send_shutdown(stcb, net);
6537                                         if (SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) {
6538                                                 SCTP_STAT_DECR_GAUGE32(sctps_currestab);
6539                                         }
6540                                         SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_SENT);
6541                                         SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING);
6542                                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb,
6543                                             net);
6544                                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
6545                                             asoc->primary_destination);
6546                                         added_control = 1;
6547                                         do_chunk_output = 0;
6548                                 }
6549                         } else {
6550                                 /*
6551                                  * we still got (or just got) data to send,
6552                                  * so set SHUTDOWN_PENDING
6553                                  */
6554                                 /*
6555                                  * XXX sockets draft says that SCTP_EOF
6556                                  * should be sent with no data.  currently,
6557                                  * we will allow user data to be sent first
6558                                  * and move to SHUTDOWN-PENDING
6559                                  */
6560                                 if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) &&
6561                                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
6562                                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
6563                                         if (asoc->locked_on_sending) {
6564                                                 /*
6565                                                  * Locked to send out the
6566                                                  * data
6567                                                  */
6568                                                 struct sctp_stream_queue_pending *sp;
6569
6570                                                 sp = TAILQ_LAST(&asoc->locked_on_sending->outqueue, sctp_streamhead);
6571                                                 if (sp) {
6572                                                         if ((sp->length == 0) && (sp->msg_is_complete == 0))
6573                                                                 asoc->state |= SCTP_STATE_PARTIAL_MSG_LEFT;
6574                                                 }
6575                                         }
6576                                         asoc->state |= SCTP_STATE_SHUTDOWN_PENDING;
6577                                         if (TAILQ_EMPTY(&asoc->send_queue) &&
6578                                             TAILQ_EMPTY(&asoc->sent_queue) &&
6579                                             (asoc->state & SCTP_STATE_PARTIAL_MSG_LEFT)) {
6580                                 abort_anyway:
6581                                                 atomic_add_int(&stcb->asoc.refcnt, 1);
6582                                                 sctp_abort_an_association(stcb->sctp_ep, stcb,
6583                                                     NULL, SCTP_SO_NOT_LOCKED);
6584                                                 atomic_add_int(&stcb->asoc.refcnt, -1);
6585                                                 goto no_chunk_output;
6586                                         }
6587                                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
6588                                             asoc->primary_destination);
6589                                 }
6590                         }
6591
6592                 }
6593         }
6594         un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
6595             (stcb->asoc.stream_queue_cnt * sizeof(struct sctp_data_chunk)));
6596
6597         if ((sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY)) &&
6598             (stcb->asoc.total_flight > 0) &&
6599             (un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD))
6600             ) {
6601                 do_chunk_output = 0;
6602         }
6603         if (do_chunk_output)
6604                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_NOT_LOCKED);
6605         else if (added_control) {
6606                 int num_out = 0, reason = 0, now_filled = 0;
6607                 struct timeval now;
6608                 int frag_point;
6609
6610                 frag_point = sctp_get_frag_point(stcb, &stcb->asoc);
6611                 (void)sctp_med_chunk_output(inp, stcb, &stcb->asoc, &num_out,
6612                     &reason, 1, 1, &now, &now_filled, frag_point, SCTP_SO_NOT_LOCKED);
6613         }
6614 no_chunk_output:
6615         if (ret) {
6616                 ca->cnt_failed++;
6617         } else {
6618                 ca->cnt_sent++;
6619         }
6620 }
6621
6622 static void
6623 sctp_sendall_completes(void *ptr, uint32_t val SCTP_UNUSED)
6624 {
6625         struct sctp_copy_all *ca;
6626
6627         ca = (struct sctp_copy_all *)ptr;
6628         /*
6629          * Do a notify here? Kacheong suggests that the notify be done at
6630          * the send time.. so you would push up a notification if any send
6631          * failed. Don't know if this is feasable since the only failures we
6632          * have is "memory" related and if you cannot get an mbuf to send
6633          * the data you surely can't get an mbuf to send up to notify the
6634          * user you can't send the data :->
6635          */
6636
6637         /* now free everything */
6638         sctp_m_freem(ca->m);
6639         SCTP_FREE(ca, SCTP_M_COPYAL);
6640 }
6641
6642
6643 #define MC_ALIGN(m, len) do {                                           \
6644         SCTP_BUF_RESV_UF(m, ((MCLBYTES - (len)) & ~(sizeof(long) - 1)); \
6645 } while (0)
6646
6647
6648
6649 static struct mbuf *
6650 sctp_copy_out_all(struct uio *uio, int len)
6651 {
6652         struct mbuf *ret, *at;
6653         int left, willcpy, cancpy, error;
6654
6655         ret = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_WAIT, 1, MT_DATA);
6656         if (ret == NULL) {
6657                 /* TSNH */
6658                 return (NULL);
6659         }
6660         left = len;
6661         SCTP_BUF_LEN(ret) = 0;
6662         /* save space for the data chunk header */
6663         cancpy = M_TRAILINGSPACE(ret);
6664         willcpy = min(cancpy, left);
6665         at = ret;
6666         while (left > 0) {
6667                 /* Align data to the end */
6668                 error = uiomove(mtod(at, caddr_t), willcpy, uio);
6669                 if (error) {
6670         err_out_now:
6671                         sctp_m_freem(at);
6672                         return (NULL);
6673                 }
6674                 SCTP_BUF_LEN(at) = willcpy;
6675                 SCTP_BUF_NEXT_PKT(at) = SCTP_BUF_NEXT(at) = 0;
6676                 left -= willcpy;
6677                 if (left > 0) {
6678                         SCTP_BUF_NEXT(at) = sctp_get_mbuf_for_msg(left, 0, M_WAIT, 1, MT_DATA);
6679                         if (SCTP_BUF_NEXT(at) == NULL) {
6680                                 goto err_out_now;
6681                         }
6682                         at = SCTP_BUF_NEXT(at);
6683                         SCTP_BUF_LEN(at) = 0;
6684                         cancpy = M_TRAILINGSPACE(at);
6685                         willcpy = min(cancpy, left);
6686                 }
6687         }
6688         return (ret);
6689 }
6690
6691 static int
6692 sctp_sendall(struct sctp_inpcb *inp, struct uio *uio, struct mbuf *m,
6693     struct sctp_sndrcvinfo *srcv)
6694 {
6695         int ret;
6696         struct sctp_copy_all *ca;
6697
6698         SCTP_MALLOC(ca, struct sctp_copy_all *, sizeof(struct sctp_copy_all),
6699             SCTP_M_COPYAL);
6700         if (ca == NULL) {
6701                 sctp_m_freem(m);
6702                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
6703                 return (ENOMEM);
6704         }
6705         memset(ca, 0, sizeof(struct sctp_copy_all));
6706
6707         ca->inp = inp;
6708         if (srcv) {
6709                 memcpy(&ca->sndrcv, srcv, sizeof(struct sctp_nonpad_sndrcvinfo));
6710         }
6711         /*
6712          * take off the sendall flag, it would be bad if we failed to do
6713          * this :-0
6714          */
6715         ca->sndrcv.sinfo_flags &= ~SCTP_SENDALL;
6716         /* get length and mbuf chain */
6717         if (uio) {
6718                 ca->sndlen = uio->uio_resid;
6719                 ca->m = sctp_copy_out_all(uio, ca->sndlen);
6720                 if (ca->m == NULL) {
6721                         SCTP_FREE(ca, SCTP_M_COPYAL);
6722                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
6723                         return (ENOMEM);
6724                 }
6725         } else {
6726                 /* Gather the length of the send */
6727                 struct mbuf *mat;
6728
6729                 mat = m;
6730                 ca->sndlen = 0;
6731                 while (m) {
6732                         ca->sndlen += SCTP_BUF_LEN(m);
6733                         m = SCTP_BUF_NEXT(m);
6734                 }
6735                 ca->m = mat;
6736         }
6737         ret = sctp_initiate_iterator(NULL, sctp_sendall_iterator, NULL,
6738             SCTP_PCB_ANY_FLAGS, SCTP_PCB_ANY_FEATURES,
6739             SCTP_ASOC_ANY_STATE,
6740             (void *)ca, 0,
6741             sctp_sendall_completes, inp, 1);
6742         if (ret) {
6743                 SCTP_PRINTF("Failed to initiate iterator for sendall\n");
6744                 SCTP_FREE(ca, SCTP_M_COPYAL);
6745                 SCTP_LTRACE_ERR_RET_PKT(m, inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EFAULT);
6746                 return (EFAULT);
6747         }
6748         return (0);
6749 }
6750
6751
6752 void
6753 sctp_toss_old_cookies(struct sctp_tcb *stcb, struct sctp_association *asoc)
6754 {
6755         struct sctp_tmit_chunk *chk, *nchk;
6756
6757         TAILQ_FOREACH_SAFE(chk, &asoc->control_send_queue, sctp_next, nchk) {
6758                 if (chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
6759                         TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
6760                         if (chk->data) {
6761                                 sctp_m_freem(chk->data);
6762                                 chk->data = NULL;
6763                         }
6764                         asoc->ctrl_queue_cnt--;
6765                         sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
6766                 }
6767         }
6768 }
6769
6770 void
6771 sctp_toss_old_asconf(struct sctp_tcb *stcb)
6772 {
6773         struct sctp_association *asoc;
6774         struct sctp_tmit_chunk *chk, *nchk;
6775         struct sctp_asconf_chunk *acp;
6776
6777         asoc = &stcb->asoc;
6778         TAILQ_FOREACH_SAFE(chk, &asoc->asconf_send_queue, sctp_next, nchk) {
6779                 /* find SCTP_ASCONF chunk in queue */
6780                 if (chk->rec.chunk_id.id == SCTP_ASCONF) {
6781                         if (chk->data) {
6782                                 acp = mtod(chk->data, struct sctp_asconf_chunk *);
6783                                 if (SCTP_TSN_GT(ntohl(acp->serial_number), asoc->asconf_seq_out_acked)) {
6784                                         /* Not Acked yet */
6785                                         break;
6786                                 }
6787                         }
6788                         TAILQ_REMOVE(&asoc->asconf_send_queue, chk, sctp_next);
6789                         if (chk->data) {
6790                                 sctp_m_freem(chk->data);
6791                                 chk->data = NULL;
6792                         }
6793                         asoc->ctrl_queue_cnt--;
6794                         sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
6795                 }
6796         }
6797 }
6798
6799
6800 static void
6801 sctp_clean_up_datalist(struct sctp_tcb *stcb,
6802     struct sctp_association *asoc,
6803     struct sctp_tmit_chunk **data_list,
6804     int bundle_at,
6805     struct sctp_nets *net)
6806 {
6807         int i;
6808         struct sctp_tmit_chunk *tp1;
6809
6810         for (i = 0; i < bundle_at; i++) {
6811                 /* off of the send queue */
6812                 TAILQ_REMOVE(&asoc->send_queue, data_list[i], sctp_next);
6813                 asoc->send_queue_cnt--;
6814                 if (i > 0) {
6815                         /*
6816                          * Any chunk NOT 0 you zap the time chunk 0 gets
6817                          * zapped or set based on if a RTO measurment is
6818                          * needed.
6819                          */
6820                         data_list[i]->do_rtt = 0;
6821                 }
6822                 /* record time */
6823                 data_list[i]->sent_rcv_time = net->last_sent_time;
6824                 data_list[i]->rec.data.cwnd_at_send = net->cwnd;
6825                 data_list[i]->rec.data.fast_retran_tsn = data_list[i]->rec.data.TSN_seq;
6826                 if (data_list[i]->whoTo == NULL) {
6827                         data_list[i]->whoTo = net;
6828                         atomic_add_int(&net->ref_count, 1);
6829                 }
6830                 /* on to the sent queue */
6831                 tp1 = TAILQ_LAST(&asoc->sent_queue, sctpchunk_listhead);
6832                 if ((tp1) && SCTP_TSN_GT(tp1->rec.data.TSN_seq, data_list[i]->rec.data.TSN_seq)) {
6833                         struct sctp_tmit_chunk *tpp;
6834
6835                         /* need to move back */
6836         back_up_more:
6837                         tpp = TAILQ_PREV(tp1, sctpchunk_listhead, sctp_next);
6838                         if (tpp == NULL) {
6839                                 TAILQ_INSERT_BEFORE(tp1, data_list[i], sctp_next);
6840                                 goto all_done;
6841                         }
6842                         tp1 = tpp;
6843                         if (SCTP_TSN_GT(tp1->rec.data.TSN_seq, data_list[i]->rec.data.TSN_seq)) {
6844                                 goto back_up_more;
6845                         }
6846                         TAILQ_INSERT_AFTER(&asoc->sent_queue, tp1, data_list[i], sctp_next);
6847                 } else {
6848                         TAILQ_INSERT_TAIL(&asoc->sent_queue,
6849                             data_list[i],
6850                             sctp_next);
6851                 }
6852 all_done:
6853                 /* This does not lower until the cum-ack passes it */
6854                 asoc->sent_queue_cnt++;
6855                 if ((asoc->peers_rwnd <= 0) &&
6856                     (asoc->total_flight == 0) &&
6857                     (bundle_at == 1)) {
6858                         /* Mark the chunk as being a window probe */
6859                         SCTP_STAT_INCR(sctps_windowprobed);
6860                 }
6861 #ifdef SCTP_AUDITING_ENABLED
6862                 sctp_audit_log(0xC2, 3);
6863 #endif
6864                 data_list[i]->sent = SCTP_DATAGRAM_SENT;
6865                 data_list[i]->snd_count = 1;
6866                 data_list[i]->rec.data.chunk_was_revoked = 0;
6867                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
6868                         sctp_misc_ints(SCTP_FLIGHT_LOG_UP,
6869                             data_list[i]->whoTo->flight_size,
6870                             data_list[i]->book_size,
6871                             (uintptr_t) data_list[i]->whoTo,
6872                             data_list[i]->rec.data.TSN_seq);
6873                 }
6874                 sctp_flight_size_increase(data_list[i]);
6875                 sctp_total_flight_increase(stcb, data_list[i]);
6876                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_RWND_ENABLE) {
6877                         sctp_log_rwnd(SCTP_DECREASE_PEER_RWND,
6878                             asoc->peers_rwnd, data_list[i]->send_size, SCTP_BASE_SYSCTL(sctp_peer_chunk_oh));
6879                 }
6880                 asoc->peers_rwnd = sctp_sbspace_sub(asoc->peers_rwnd,
6881                     (uint32_t) (data_list[i]->send_size + SCTP_BASE_SYSCTL(sctp_peer_chunk_oh)));
6882                 if (asoc->peers_rwnd < stcb->sctp_ep->sctp_ep.sctp_sws_sender) {
6883                         /* SWS sender side engages */
6884                         asoc->peers_rwnd = 0;
6885                 }
6886         }
6887         if (asoc->cc_functions.sctp_cwnd_update_packet_transmitted) {
6888                 (*asoc->cc_functions.sctp_cwnd_update_packet_transmitted) (stcb, net);
6889         }
6890 }
6891
6892 static void
6893 sctp_clean_up_ctl(struct sctp_tcb *stcb, struct sctp_association *asoc, int so_locked
6894 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
6895     SCTP_UNUSED
6896 #endif
6897 )
6898 {
6899         struct sctp_tmit_chunk *chk, *nchk;
6900
6901         TAILQ_FOREACH_SAFE(chk, &asoc->control_send_queue, sctp_next, nchk) {
6902                 if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
6903                     (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK) ||  /* EY */
6904                     (chk->rec.chunk_id.id == SCTP_HEARTBEAT_REQUEST) ||
6905                     (chk->rec.chunk_id.id == SCTP_HEARTBEAT_ACK) ||
6906                     (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN) ||
6907                     (chk->rec.chunk_id.id == SCTP_SHUTDOWN) ||
6908                     (chk->rec.chunk_id.id == SCTP_SHUTDOWN_ACK) ||
6909                     (chk->rec.chunk_id.id == SCTP_OPERATION_ERROR) ||
6910                     (chk->rec.chunk_id.id == SCTP_PACKET_DROPPED) ||
6911                     (chk->rec.chunk_id.id == SCTP_COOKIE_ACK) ||
6912                     (chk->rec.chunk_id.id == SCTP_ECN_CWR) ||
6913                     (chk->rec.chunk_id.id == SCTP_ASCONF_ACK)) {
6914                         /* Stray chunks must be cleaned up */
6915         clean_up_anyway:
6916                         TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
6917                         if (chk->data) {
6918                                 sctp_m_freem(chk->data);
6919                                 chk->data = NULL;
6920                         }
6921                         asoc->ctrl_queue_cnt--;
6922                         if (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN)
6923                                 asoc->fwd_tsn_cnt--;
6924                         sctp_free_a_chunk(stcb, chk, so_locked);
6925                 } else if (chk->rec.chunk_id.id == SCTP_STREAM_RESET) {
6926                         /* special handling, we must look into the param */
6927                         if (chk != asoc->str_reset) {
6928                                 goto clean_up_anyway;
6929                         }
6930                 }
6931         }
6932 }
6933
6934
6935 static int
6936 sctp_can_we_split_this(struct sctp_tcb *stcb,
6937     uint32_t length,
6938     uint32_t goal_mtu, uint32_t frag_point, int eeor_on)
6939 {
6940         /*
6941          * Make a decision on if I should split a msg into multiple parts.
6942          * This is only asked of incomplete messages.
6943          */
6944         if (eeor_on) {
6945                 /*
6946                  * If we are doing EEOR we need to always send it if its the
6947                  * entire thing, since it might be all the guy is putting in
6948                  * the hopper.
6949                  */
6950                 if (goal_mtu >= length) {
6951                         /*-
6952                          * If we have data outstanding,
6953                          * we get another chance when the sack
6954                          * arrives to transmit - wait for more data
6955                          */
6956                         if (stcb->asoc.total_flight == 0) {
6957                                 /*
6958                                  * If nothing is in flight, we zero the
6959                                  * packet counter.
6960                                  */
6961                                 return (length);
6962                         }
6963                         return (0);
6964
6965                 } else {
6966                         /* You can fill the rest */
6967                         return (goal_mtu);
6968                 }
6969         }
6970         /*-
6971          * For those strange folk that make the send buffer
6972          * smaller than our fragmentation point, we can't
6973          * get a full msg in so we have to allow splitting.
6974          */
6975         if (SCTP_SB_LIMIT_SND(stcb->sctp_socket) < frag_point) {
6976                 return (length);
6977         }
6978         if ((length <= goal_mtu) ||
6979             ((length - goal_mtu) < SCTP_BASE_SYSCTL(sctp_min_residual))) {
6980                 /* Sub-optimial residual don't split in non-eeor mode. */
6981                 return (0);
6982         }
6983         /*
6984          * If we reach here length is larger than the goal_mtu. Do we wish
6985          * to split it for the sake of packet putting together?
6986          */
6987         if (goal_mtu >= min(SCTP_BASE_SYSCTL(sctp_min_split_point), frag_point)) {
6988                 /* Its ok to split it */
6989                 return (min(goal_mtu, frag_point));
6990         }
6991         /* Nope, can't split */
6992         return (0);
6993
6994 }
6995
6996 static uint32_t
6997 sctp_move_to_outqueue(struct sctp_tcb *stcb,
6998     struct sctp_stream_out *strq,
6999     uint32_t goal_mtu,
7000     uint32_t frag_point,
7001     int *locked,
7002     int *giveup,
7003     int eeor_mode,
7004     int *bail,
7005     int so_locked
7006 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
7007     SCTP_UNUSED
7008 #endif
7009 )
7010 {
7011         /* Move from the stream to the send_queue keeping track of the total */
7012         struct sctp_association *asoc;
7013         struct sctp_stream_queue_pending *sp;
7014         struct sctp_tmit_chunk *chk;
7015         struct sctp_data_chunk *dchkh;
7016         uint32_t to_move, length;
7017         uint8_t rcv_flags = 0;
7018         uint8_t some_taken;
7019         uint8_t send_lock_up = 0;
7020
7021         SCTP_TCB_LOCK_ASSERT(stcb);
7022         asoc = &stcb->asoc;
7023 one_more_time:
7024         /* sa_ignore FREED_MEMORY */
7025         sp = TAILQ_FIRST(&strq->outqueue);
7026         if (sp == NULL) {
7027                 *locked = 0;
7028                 if (send_lock_up == 0) {
7029                         SCTP_TCB_SEND_LOCK(stcb);
7030                         send_lock_up = 1;
7031                 }
7032                 sp = TAILQ_FIRST(&strq->outqueue);
7033                 if (sp) {
7034                         goto one_more_time;
7035                 }
7036                 if (strq->last_msg_incomplete) {
7037                         SCTP_PRINTF("Huh? Stream:%d lm_in_c=%d but queue is NULL\n",
7038                             strq->stream_no,
7039                             strq->last_msg_incomplete);
7040                         strq->last_msg_incomplete = 0;
7041                 }
7042                 to_move = 0;
7043                 if (send_lock_up) {
7044                         SCTP_TCB_SEND_UNLOCK(stcb);
7045                         send_lock_up = 0;
7046                 }
7047                 goto out_of;
7048         }
7049         if ((sp->msg_is_complete) && (sp->length == 0)) {
7050                 if (sp->sender_all_done) {
7051                         /*
7052                          * We are doing differed cleanup. Last time through
7053                          * when we took all the data the sender_all_done was
7054                          * not set.
7055                          */
7056                         if ((sp->put_last_out == 0) && (sp->discard_rest == 0)) {
7057                                 SCTP_PRINTF("Gak, put out entire msg with NO end!-1\n");
7058                                 SCTP_PRINTF("sender_done:%d len:%d msg_comp:%d put_last_out:%d send_lock:%d\n",
7059                                     sp->sender_all_done,
7060                                     sp->length,
7061                                     sp->msg_is_complete,
7062                                     sp->put_last_out,
7063                                     send_lock_up);
7064                         }
7065                         if ((TAILQ_NEXT(sp, next) == NULL) && (send_lock_up == 0)) {
7066                                 SCTP_TCB_SEND_LOCK(stcb);
7067                                 send_lock_up = 1;
7068                         }
7069                         atomic_subtract_int(&asoc->stream_queue_cnt, 1);
7070                         TAILQ_REMOVE(&strq->outqueue, sp, next);
7071                         stcb->asoc.ss_functions.sctp_ss_remove_from_stream(stcb, asoc, strq, sp, send_lock_up);
7072                         if (sp->net) {
7073                                 sctp_free_remote_addr(sp->net);
7074                                 sp->net = NULL;
7075                         }
7076                         if (sp->data) {
7077                                 sctp_m_freem(sp->data);
7078                                 sp->data = NULL;
7079                         }
7080                         sctp_free_a_strmoq(stcb, sp, so_locked);
7081                         /* we can't be locked to it */
7082                         *locked = 0;
7083                         stcb->asoc.locked_on_sending = NULL;
7084                         if (send_lock_up) {
7085                                 SCTP_TCB_SEND_UNLOCK(stcb);
7086                                 send_lock_up = 0;
7087                         }
7088                         /* back to get the next msg */
7089                         goto one_more_time;
7090                 } else {
7091                         /*
7092                          * sender just finished this but still holds a
7093                          * reference
7094                          */
7095                         *locked = 1;
7096                         *giveup = 1;
7097                         to_move = 0;
7098                         goto out_of;
7099                 }
7100         } else {
7101                 /* is there some to get */
7102                 if (sp->length == 0) {
7103                         /* no */
7104                         *locked = 1;
7105                         *giveup = 1;
7106                         to_move = 0;
7107                         goto out_of;
7108                 } else if (sp->discard_rest) {
7109                         if (send_lock_up == 0) {
7110                                 SCTP_TCB_SEND_LOCK(stcb);
7111                                 send_lock_up = 1;
7112                         }
7113                         /* Whack down the size */
7114                         atomic_subtract_int(&stcb->asoc.total_output_queue_size, sp->length);
7115                         if ((stcb->sctp_socket != NULL) && \
7116                             ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
7117                             (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL))) {
7118                                 atomic_subtract_int(&stcb->sctp_socket->so_snd.sb_cc, sp->length);
7119                         }
7120                         if (sp->data) {
7121                                 sctp_m_freem(sp->data);
7122                                 sp->data = NULL;
7123                                 sp->tail_mbuf = NULL;
7124                         }
7125                         sp->length = 0;
7126                         sp->some_taken = 1;
7127                         *locked = 1;
7128                         *giveup = 1;
7129                         to_move = 0;
7130                         goto out_of;
7131                 }
7132         }
7133         some_taken = sp->some_taken;
7134         if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
7135                 sp->msg_is_complete = 1;
7136         }
7137 re_look:
7138         length = sp->length;
7139         if (sp->msg_is_complete) {
7140                 /* The message is complete */
7141                 to_move = min(length, frag_point);
7142                 if (to_move == length) {
7143                         /* All of it fits in the MTU */
7144                         if (sp->some_taken) {
7145                                 rcv_flags |= SCTP_DATA_LAST_FRAG;
7146                                 sp->put_last_out = 1;
7147                         } else {
7148                                 rcv_flags |= SCTP_DATA_NOT_FRAG;
7149                                 sp->put_last_out = 1;
7150                         }
7151                 } else {
7152                         /* Not all of it fits, we fragment */
7153                         if (sp->some_taken == 0) {
7154                                 rcv_flags |= SCTP_DATA_FIRST_FRAG;
7155                         }
7156                         sp->some_taken = 1;
7157                 }
7158         } else {
7159                 to_move = sctp_can_we_split_this(stcb, length, goal_mtu, frag_point, eeor_mode);
7160                 if (to_move) {
7161                         /*-
7162                          * We use a snapshot of length in case it
7163                          * is expanding during the compare.
7164                          */
7165                         uint32_t llen;
7166
7167                         llen = length;
7168                         if (to_move >= llen) {
7169                                 to_move = llen;
7170                                 if (send_lock_up == 0) {
7171                                         /*-
7172                                          * We are taking all of an incomplete msg
7173                                          * thus we need a send lock.
7174                                          */
7175                                         SCTP_TCB_SEND_LOCK(stcb);
7176                                         send_lock_up = 1;
7177                                         if (sp->msg_is_complete) {
7178                                                 /*
7179                                                  * the sender finished the
7180                                                  * msg
7181                                                  */
7182                                                 goto re_look;
7183                                         }
7184                                 }
7185                         }
7186                         if (sp->some_taken == 0) {
7187                                 rcv_flags |= SCTP_DATA_FIRST_FRAG;
7188                                 sp->some_taken = 1;
7189                         }
7190                 } else {
7191                         /* Nothing to take. */
7192                         if (sp->some_taken) {
7193                                 *locked = 1;
7194                         }
7195                         *giveup = 1;
7196                         to_move = 0;
7197                         goto out_of;
7198                 }
7199         }
7200
7201         /* If we reach here, we can copy out a chunk */
7202         sctp_alloc_a_chunk(stcb, chk);
7203         if (chk == NULL) {
7204                 /* No chunk memory */
7205                 *giveup = 1;
7206                 to_move = 0;
7207                 goto out_of;
7208         }
7209         /*
7210          * Setup for unordered if needed by looking at the user sent info
7211          * flags.
7212          */
7213         if (sp->sinfo_flags & SCTP_UNORDERED) {
7214                 rcv_flags |= SCTP_DATA_UNORDERED;
7215         }
7216         if ((SCTP_BASE_SYSCTL(sctp_enable_sack_immediately) && ((sp->sinfo_flags & SCTP_EOF) == SCTP_EOF)) ||
7217             ((sp->sinfo_flags & SCTP_SACK_IMMEDIATELY) == SCTP_SACK_IMMEDIATELY)) {
7218                 rcv_flags |= SCTP_DATA_SACK_IMMEDIATELY;
7219         }
7220         /* clear out the chunk before setting up */
7221         memset(chk, 0, sizeof(*chk));
7222         chk->rec.data.rcv_flags = rcv_flags;
7223
7224         if (to_move >= length) {
7225                 /* we think we can steal the whole thing */
7226                 if ((sp->sender_all_done == 0) && (send_lock_up == 0)) {
7227                         SCTP_TCB_SEND_LOCK(stcb);
7228                         send_lock_up = 1;
7229                 }
7230                 if (to_move < sp->length) {
7231                         /* bail, it changed */
7232                         goto dont_do_it;
7233                 }
7234                 chk->data = sp->data;
7235                 chk->last_mbuf = sp->tail_mbuf;
7236                 /* register the stealing */
7237                 sp->data = sp->tail_mbuf = NULL;
7238         } else {
7239                 struct mbuf *m;
7240
7241 dont_do_it:
7242                 chk->data = SCTP_M_COPYM(sp->data, 0, to_move, M_DONTWAIT);
7243                 chk->last_mbuf = NULL;
7244                 if (chk->data == NULL) {
7245                         sp->some_taken = some_taken;
7246                         sctp_free_a_chunk(stcb, chk, so_locked);
7247                         *bail = 1;
7248                         to_move = 0;
7249                         goto out_of;
7250                 }
7251 #ifdef SCTP_MBUF_LOGGING
7252                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
7253                         struct mbuf *mat;
7254
7255                         for (mat = chk->data; mat; mat = SCTP_BUF_NEXT(mat)) {
7256                                 if (SCTP_BUF_IS_EXTENDED(mat)) {
7257                                         sctp_log_mb(mat, SCTP_MBUF_ICOPY);
7258                                 }
7259                         }
7260                 }
7261 #endif
7262                 /* Pull off the data */
7263                 m_adj(sp->data, to_move);
7264                 /* Now lets work our way down and compact it */
7265                 m = sp->data;
7266                 while (m && (SCTP_BUF_LEN(m) == 0)) {
7267                         sp->data = SCTP_BUF_NEXT(m);
7268                         SCTP_BUF_NEXT(m) = NULL;
7269                         if (sp->tail_mbuf == m) {
7270                                 /*-
7271                                  * Freeing tail? TSNH since
7272                                  * we supposedly were taking less
7273                                  * than the sp->length.
7274                                  */
7275 #ifdef INVARIANTS
7276                                 panic("Huh, freing tail? - TSNH");
7277 #else
7278                                 SCTP_PRINTF("Huh, freeing tail? - TSNH\n");
7279                                 sp->tail_mbuf = sp->data = NULL;
7280                                 sp->length = 0;
7281 #endif
7282
7283                         }
7284                         sctp_m_free(m);
7285                         m = sp->data;
7286                 }
7287         }
7288         if (SCTP_BUF_IS_EXTENDED(chk->data)) {
7289                 chk->copy_by_ref = 1;
7290         } else {
7291                 chk->copy_by_ref = 0;
7292         }
7293         /*
7294          * get last_mbuf and counts of mb useage This is ugly but hopefully
7295          * its only one mbuf.
7296          */
7297         if (chk->last_mbuf == NULL) {
7298                 chk->last_mbuf = chk->data;
7299                 while (SCTP_BUF_NEXT(chk->last_mbuf) != NULL) {
7300                         chk->last_mbuf = SCTP_BUF_NEXT(chk->last_mbuf);
7301                 }
7302         }
7303         if (to_move > length) {
7304                 /*- This should not happen either
7305                  * since we always lower to_move to the size
7306                  * of sp->length if its larger.
7307                  */
7308 #ifdef INVARIANTS
7309                 panic("Huh, how can to_move be larger?");
7310 #else
7311                 SCTP_PRINTF("Huh, how can to_move be larger?\n");
7312                 sp->length = 0;
7313 #endif
7314         } else {
7315                 atomic_subtract_int(&sp->length, to_move);
7316         }
7317         if (M_LEADINGSPACE(chk->data) < (int)sizeof(struct sctp_data_chunk)) {
7318                 /* Not enough room for a chunk header, get some */
7319                 struct mbuf *m;
7320
7321                 m = sctp_get_mbuf_for_msg(1, 0, M_DONTWAIT, 0, MT_DATA);
7322                 if (m == NULL) {
7323                         /*
7324                          * we're in trouble here. _PREPEND below will free
7325                          * all the data if there is no leading space, so we
7326                          * must put the data back and restore.
7327                          */
7328                         if (send_lock_up == 0) {
7329                                 SCTP_TCB_SEND_LOCK(stcb);
7330                                 send_lock_up = 1;
7331                         }
7332                         if (chk->data == NULL) {
7333                                 /* unsteal the data */
7334                                 sp->data = chk->data;
7335                                 sp->tail_mbuf = chk->last_mbuf;
7336                         } else {
7337                                 struct mbuf *m_tmp;
7338
7339                                 /* reassemble the data */
7340                                 m_tmp = sp->data;
7341                                 sp->data = chk->data;
7342                                 SCTP_BUF_NEXT(chk->last_mbuf) = m_tmp;
7343                         }
7344                         sp->some_taken = some_taken;
7345                         atomic_add_int(&sp->length, to_move);
7346                         chk->data = NULL;
7347                         *bail = 1;
7348                         sctp_free_a_chunk(stcb, chk, so_locked);
7349                         to_move = 0;
7350                         goto out_of;
7351                 } else {
7352                         SCTP_BUF_LEN(m) = 0;
7353                         SCTP_BUF_NEXT(m) = chk->data;
7354                         chk->data = m;
7355                         M_ALIGN(chk->data, 4);
7356                 }
7357         }
7358         SCTP_BUF_PREPEND(chk->data, sizeof(struct sctp_data_chunk), M_DONTWAIT);
7359         if (chk->data == NULL) {
7360                 /* HELP, TSNH since we assured it would not above? */
7361 #ifdef INVARIANTS
7362                 panic("prepend failes HELP?");
7363 #else
7364                 SCTP_PRINTF("prepend fails HELP?\n");
7365                 sctp_free_a_chunk(stcb, chk, so_locked);
7366 #endif
7367                 *bail = 1;
7368                 to_move = 0;
7369                 goto out_of;
7370         }
7371         sctp_snd_sb_alloc(stcb, sizeof(struct sctp_data_chunk));
7372         chk->book_size = chk->send_size = (to_move + sizeof(struct sctp_data_chunk));
7373         chk->book_size_scale = 0;
7374         chk->sent = SCTP_DATAGRAM_UNSENT;
7375
7376         chk->flags = 0;
7377         chk->asoc = &stcb->asoc;
7378         chk->pad_inplace = 0;
7379         chk->no_fr_allowed = 0;
7380         chk->rec.data.stream_seq = sp->strseq;
7381         chk->rec.data.stream_number = sp->stream;
7382         chk->rec.data.payloadtype = sp->ppid;
7383         chk->rec.data.context = sp->context;
7384         chk->rec.data.doing_fast_retransmit = 0;
7385
7386         chk->rec.data.timetodrop = sp->ts;
7387         chk->flags = sp->act_flags;
7388
7389         if (sp->net) {
7390                 chk->whoTo = sp->net;
7391                 atomic_add_int(&chk->whoTo->ref_count, 1);
7392         } else
7393                 chk->whoTo = NULL;
7394
7395         if (sp->holds_key_ref) {
7396                 chk->auth_keyid = sp->auth_keyid;
7397                 sctp_auth_key_acquire(stcb, chk->auth_keyid);
7398                 chk->holds_key_ref = 1;
7399         }
7400         chk->rec.data.TSN_seq = atomic_fetchadd_int(&asoc->sending_seq, 1);
7401         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_AT_SEND_2_OUTQ) {
7402                 sctp_misc_ints(SCTP_STRMOUT_LOG_SEND,
7403                     (uintptr_t) stcb, sp->length,
7404                     (uint32_t) ((chk->rec.data.stream_number << 16) | chk->rec.data.stream_seq),
7405                     chk->rec.data.TSN_seq);
7406         }
7407         dchkh = mtod(chk->data, struct sctp_data_chunk *);
7408         /*
7409          * Put the rest of the things in place now. Size was done earlier in
7410          * previous loop prior to padding.
7411          */
7412
7413 #ifdef SCTP_ASOCLOG_OF_TSNS
7414         SCTP_TCB_LOCK_ASSERT(stcb);
7415         if (asoc->tsn_out_at >= SCTP_TSN_LOG_SIZE) {
7416                 asoc->tsn_out_at = 0;
7417                 asoc->tsn_out_wrapped = 1;
7418         }
7419         asoc->out_tsnlog[asoc->tsn_out_at].tsn = chk->rec.data.TSN_seq;
7420         asoc->out_tsnlog[asoc->tsn_out_at].strm = chk->rec.data.stream_number;
7421         asoc->out_tsnlog[asoc->tsn_out_at].seq = chk->rec.data.stream_seq;
7422         asoc->out_tsnlog[asoc->tsn_out_at].sz = chk->send_size;
7423         asoc->out_tsnlog[asoc->tsn_out_at].flgs = chk->rec.data.rcv_flags;
7424         asoc->out_tsnlog[asoc->tsn_out_at].stcb = (void *)stcb;
7425         asoc->out_tsnlog[asoc->tsn_out_at].in_pos = asoc->tsn_out_at;
7426         asoc->out_tsnlog[asoc->tsn_out_at].in_out = 2;
7427         asoc->tsn_out_at++;
7428 #endif
7429
7430         dchkh->ch.chunk_type = SCTP_DATA;
7431         dchkh->ch.chunk_flags = chk->rec.data.rcv_flags;
7432         dchkh->dp.tsn = htonl(chk->rec.data.TSN_seq);
7433         dchkh->dp.stream_id = htons(strq->stream_no);
7434         dchkh->dp.stream_sequence = htons(chk->rec.data.stream_seq);
7435         dchkh->dp.protocol_id = chk->rec.data.payloadtype;
7436         dchkh->ch.chunk_length = htons(chk->send_size);
7437         /* Now advance the chk->send_size by the actual pad needed. */
7438         if (chk->send_size < SCTP_SIZE32(chk->book_size)) {
7439                 /* need a pad */
7440                 struct mbuf *lm;
7441                 int pads;
7442
7443                 pads = SCTP_SIZE32(chk->book_size) - chk->send_size;
7444                 if (sctp_pad_lastmbuf(chk->data, pads, chk->last_mbuf) == 0) {
7445                         chk->pad_inplace = 1;
7446                 }
7447                 if ((lm = SCTP_BUF_NEXT(chk->last_mbuf)) != NULL) {
7448                         /* pad added an mbuf */
7449                         chk->last_mbuf = lm;
7450                 }
7451                 chk->send_size += pads;
7452         }
7453         /* We only re-set the policy if it is on */
7454         if (sp->pr_sctp_on) {
7455                 sctp_set_prsctp_policy(sp);
7456                 asoc->pr_sctp_cnt++;
7457                 chk->pr_sctp_on = 1;
7458         } else {
7459                 chk->pr_sctp_on = 0;
7460         }
7461         if (sp->msg_is_complete && (sp->length == 0) && (sp->sender_all_done)) {
7462                 /* All done pull and kill the message */
7463                 atomic_subtract_int(&asoc->stream_queue_cnt, 1);
7464                 if (sp->put_last_out == 0) {
7465                         SCTP_PRINTF("Gak, put out entire msg with NO end!-2\n");
7466                         SCTP_PRINTF("sender_done:%d len:%d msg_comp:%d put_last_out:%d send_lock:%d\n",
7467                             sp->sender_all_done,
7468                             sp->length,
7469                             sp->msg_is_complete,
7470                             sp->put_last_out,
7471                             send_lock_up);
7472                 }
7473                 if ((send_lock_up == 0) && (TAILQ_NEXT(sp, next) == NULL)) {
7474                         SCTP_TCB_SEND_LOCK(stcb);
7475                         send_lock_up = 1;
7476                 }
7477                 TAILQ_REMOVE(&strq->outqueue, sp, next);
7478                 stcb->asoc.ss_functions.sctp_ss_remove_from_stream(stcb, asoc, strq, sp, send_lock_up);
7479                 if (sp->net) {
7480                         sctp_free_remote_addr(sp->net);
7481                         sp->net = NULL;
7482                 }
7483                 if (sp->data) {
7484                         sctp_m_freem(sp->data);
7485                         sp->data = NULL;
7486                 }
7487                 sctp_free_a_strmoq(stcb, sp, so_locked);
7488
7489                 /* we can't be locked to it */
7490                 *locked = 0;
7491                 stcb->asoc.locked_on_sending = NULL;
7492         } else {
7493                 /* more to go, we are locked */
7494                 *locked = 1;
7495         }
7496         asoc->chunks_on_out_queue++;
7497         TAILQ_INSERT_TAIL(&asoc->send_queue, chk, sctp_next);
7498         asoc->send_queue_cnt++;
7499 out_of:
7500         if (send_lock_up) {
7501                 SCTP_TCB_SEND_UNLOCK(stcb);
7502         }
7503         return (to_move);
7504 }
7505
7506
7507 static void
7508 sctp_fill_outqueue(struct sctp_tcb *stcb,
7509     struct sctp_nets *net, int frag_point, int eeor_mode, int *quit_now, int so_locked
7510 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
7511     SCTP_UNUSED
7512 #endif
7513 )
7514 {
7515         struct sctp_association *asoc;
7516         struct sctp_stream_out *strq;
7517         int goal_mtu, moved_how_much, total_moved = 0, bail = 0;
7518         int locked, giveup;
7519
7520         SCTP_TCB_LOCK_ASSERT(stcb);
7521         asoc = &stcb->asoc;
7522         switch (net->ro._l_addr.sa.sa_family) {
7523 #ifdef INET
7524         case AF_INET:
7525                 goal_mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
7526                 break;
7527 #endif
7528 #ifdef INET6
7529         case AF_INET6:
7530                 goal_mtu = net->mtu - SCTP_MIN_OVERHEAD;
7531                 break;
7532 #endif
7533         default:
7534                 /* TSNH */
7535                 goal_mtu = net->mtu;
7536                 break;
7537         }
7538         /* Need an allowance for the data chunk header too */
7539         goal_mtu -= sizeof(struct sctp_data_chunk);
7540
7541         /* must make even word boundary */
7542         goal_mtu &= 0xfffffffc;
7543         if (asoc->locked_on_sending) {
7544                 /* We are stuck on one stream until the message completes. */
7545                 strq = asoc->locked_on_sending;
7546                 locked = 1;
7547         } else {
7548                 strq = stcb->asoc.ss_functions.sctp_ss_select_stream(stcb, net, asoc);
7549                 locked = 0;
7550         }
7551         while ((goal_mtu > 0) && strq) {
7552                 giveup = 0;
7553                 bail = 0;
7554                 moved_how_much = sctp_move_to_outqueue(stcb, strq, goal_mtu, frag_point, &locked,
7555                     &giveup, eeor_mode, &bail, so_locked);
7556                 if (moved_how_much)
7557                         stcb->asoc.ss_functions.sctp_ss_scheduled(stcb, net, asoc, strq, moved_how_much);
7558
7559                 if (locked) {
7560                         asoc->locked_on_sending = strq;
7561                         if ((moved_how_much == 0) || (giveup) || bail)
7562                                 /* no more to move for now */
7563                                 break;
7564                 } else {
7565                         asoc->locked_on_sending = NULL;
7566                         if ((giveup) || bail) {
7567                                 break;
7568                         }
7569                         strq = stcb->asoc.ss_functions.sctp_ss_select_stream(stcb, net, asoc);
7570                         if (strq == NULL) {
7571                                 break;
7572                         }
7573                 }
7574                 total_moved += moved_how_much;
7575                 goal_mtu -= (moved_how_much + sizeof(struct sctp_data_chunk));
7576                 goal_mtu &= 0xfffffffc;
7577         }
7578         if (bail)
7579                 *quit_now = 1;
7580
7581         stcb->asoc.ss_functions.sctp_ss_packet_done(stcb, net, asoc);
7582
7583         if (total_moved == 0) {
7584                 if ((stcb->asoc.sctp_cmt_on_off == 0) &&
7585                     (net == stcb->asoc.primary_destination)) {
7586                         /* ran dry for primary network net */
7587                         SCTP_STAT_INCR(sctps_primary_randry);
7588                 } else if (stcb->asoc.sctp_cmt_on_off > 0) {
7589                         /* ran dry with CMT on */
7590                         SCTP_STAT_INCR(sctps_cmt_randry);
7591                 }
7592         }
7593 }
7594
7595 void
7596 sctp_fix_ecn_echo(struct sctp_association *asoc)
7597 {
7598         struct sctp_tmit_chunk *chk;
7599
7600         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
7601                 if (chk->rec.chunk_id.id == SCTP_ECN_ECHO) {
7602                         chk->sent = SCTP_DATAGRAM_UNSENT;
7603                 }
7604         }
7605 }
7606
7607 void
7608 sctp_move_chunks_from_net(struct sctp_tcb *stcb, struct sctp_nets *net)
7609 {
7610         struct sctp_association *asoc;
7611         struct sctp_tmit_chunk *chk;
7612         struct sctp_stream_queue_pending *sp;
7613         unsigned int i;
7614
7615         if (net == NULL) {
7616                 return;
7617         }
7618         asoc = &stcb->asoc;
7619         for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
7620                 TAILQ_FOREACH(sp, &stcb->asoc.strmout[i].outqueue, next) {
7621                         if (sp->net == net) {
7622                                 sctp_free_remote_addr(sp->net);
7623                                 sp->net = NULL;
7624                         }
7625                 }
7626         }
7627         TAILQ_FOREACH(chk, &asoc->send_queue, sctp_next) {
7628                 if (chk->whoTo == net) {
7629                         sctp_free_remote_addr(chk->whoTo);
7630                         chk->whoTo = NULL;
7631                 }
7632         }
7633 }
7634
7635 int
7636 sctp_med_chunk_output(struct sctp_inpcb *inp,
7637     struct sctp_tcb *stcb,
7638     struct sctp_association *asoc,
7639     int *num_out,
7640     int *reason_code,
7641     int control_only, int from_where,
7642     struct timeval *now, int *now_filled, int frag_point, int so_locked
7643 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
7644     SCTP_UNUSED
7645 #endif
7646 )
7647 {
7648         /*
7649          * Ok this is the generic chunk service queue. we must do the
7650          * following: - Service the stream queue that is next, moving any
7651          * message (note I must get a complete message i.e. FIRST/MIDDLE and
7652          * LAST to the out queue in one pass) and assigning TSN's - Check to
7653          * see if the cwnd/rwnd allows any output, if so we go ahead and
7654          * fomulate and send the low level chunks. Making sure to combine
7655          * any control in the control chunk queue also.
7656          */
7657         struct sctp_nets *net, *start_at, *sack_goes_to = NULL, *old_start_at = NULL;
7658         struct mbuf *outchain, *endoutchain;
7659         struct sctp_tmit_chunk *chk, *nchk;
7660
7661         /* temp arrays for unlinking */
7662         struct sctp_tmit_chunk *data_list[SCTP_MAX_DATA_BUNDLING];
7663         int no_fragmentflg, error;
7664         unsigned int max_rwnd_per_dest, max_send_per_dest;
7665         int one_chunk, hbflag, skip_data_for_this_net;
7666         int asconf, cookie, no_out_cnt;
7667         int bundle_at, ctl_cnt, no_data_chunks, eeor_mode;
7668         unsigned int mtu, r_mtu, omtu, mx_mtu, to_out;
7669         int tsns_sent = 0;
7670         uint32_t auth_offset = 0;
7671         struct sctp_auth_chunk *auth = NULL;
7672         uint16_t auth_keyid;
7673         int override_ok = 1;
7674         int skip_fill_up = 0;
7675         int data_auth_reqd = 0;
7676
7677         /*
7678          * JRS 5/14/07 - Add flag for whether a heartbeat is sent to the
7679          * destination.
7680          */
7681         int quit_now = 0;
7682
7683         *num_out = 0;
7684         auth_keyid = stcb->asoc.authinfo.active_keyid;
7685
7686         if ((asoc->state & SCTP_STATE_SHUTDOWN_PENDING) ||
7687             (asoc->state & SCTP_STATE_SHUTDOWN_RECEIVED) ||
7688             (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_EXPLICIT_EOR))) {
7689                 eeor_mode = 1;
7690         } else {
7691                 eeor_mode = 0;
7692         }
7693         ctl_cnt = no_out_cnt = asconf = cookie = 0;
7694         /*
7695          * First lets prime the pump. For each destination, if there is room
7696          * in the flight size, attempt to pull an MTU's worth out of the
7697          * stream queues into the general send_queue
7698          */
7699 #ifdef SCTP_AUDITING_ENABLED
7700         sctp_audit_log(0xC2, 2);
7701 #endif
7702         SCTP_TCB_LOCK_ASSERT(stcb);
7703         hbflag = 0;
7704         if ((control_only) || (asoc->stream_reset_outstanding))
7705                 no_data_chunks = 1;
7706         else
7707                 no_data_chunks = 0;
7708
7709         /* Nothing to possible to send? */
7710         if ((TAILQ_EMPTY(&asoc->control_send_queue) ||
7711             (asoc->ctrl_queue_cnt == stcb->asoc.ecn_echo_cnt_onq)) &&
7712             TAILQ_EMPTY(&asoc->asconf_send_queue) &&
7713             TAILQ_EMPTY(&asoc->send_queue) &&
7714             stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc)) {
7715 nothing_to_send:
7716                 *reason_code = 9;
7717                 return (0);
7718         }
7719         if (asoc->peers_rwnd == 0) {
7720                 /* No room in peers rwnd */
7721                 *reason_code = 1;
7722                 if (asoc->total_flight > 0) {
7723                         /* we are allowed one chunk in flight */
7724                         no_data_chunks = 1;
7725                 }
7726         }
7727         if (stcb->asoc.ecn_echo_cnt_onq) {
7728                 /* Record where a sack goes, if any */
7729                 if (no_data_chunks &&
7730                     (asoc->ctrl_queue_cnt == stcb->asoc.ecn_echo_cnt_onq)) {
7731                         /* Nothing but ECNe to send - we don't do that */
7732                         goto nothing_to_send;
7733                 }
7734                 TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
7735                         if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
7736                             (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK)) {
7737                                 sack_goes_to = chk->whoTo;
7738                                 break;
7739                         }
7740                 }
7741         }
7742         max_rwnd_per_dest = ((asoc->peers_rwnd + asoc->total_flight) / asoc->numnets);
7743         if (stcb->sctp_socket)
7744                 max_send_per_dest = SCTP_SB_LIMIT_SND(stcb->sctp_socket) / asoc->numnets;
7745         else
7746                 max_send_per_dest = 0;
7747         if (no_data_chunks == 0) {
7748                 /* How many non-directed chunks are there? */
7749                 TAILQ_FOREACH(chk, &asoc->send_queue, sctp_next) {
7750                         if (chk->whoTo == NULL) {
7751                                 /*
7752                                  * We already have non-directed chunks on
7753                                  * the queue, no need to do a fill-up.
7754                                  */
7755                                 skip_fill_up = 1;
7756                                 break;
7757                         }
7758                 }
7759
7760         }
7761         if ((no_data_chunks == 0) &&
7762             (skip_fill_up == 0) &&
7763             (!stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc))) {
7764                 TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
7765                         /*
7766                          * This for loop we are in takes in each net, if
7767                          * its's got space in cwnd and has data sent to it
7768                          * (when CMT is off) then it calls
7769                          * sctp_fill_outqueue for the net. This gets data on
7770                          * the send queue for that network.
7771                          *
7772                          * In sctp_fill_outqueue TSN's are assigned and data is
7773                          * copied out of the stream buffers. Note mostly
7774                          * copy by reference (we hope).
7775                          */
7776                         net->window_probe = 0;
7777                         if ((net != stcb->asoc.alternate) &&
7778                             ((net->dest_state & SCTP_ADDR_PF) ||
7779                             (!(net->dest_state & SCTP_ADDR_REACHABLE)) ||
7780                             (net->dest_state & SCTP_ADDR_UNCONFIRMED))) {
7781                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
7782                                         sctp_log_cwnd(stcb, net, 1,
7783                                             SCTP_CWND_LOG_FILL_OUTQ_CALLED);
7784                                 }
7785                                 continue;
7786                         }
7787                         if ((stcb->asoc.cc_functions.sctp_cwnd_new_transmission_begins) &&
7788                             (net->flight_size == 0)) {
7789                                 (*stcb->asoc.cc_functions.sctp_cwnd_new_transmission_begins) (stcb, net);
7790                         }
7791                         if (net->flight_size >= net->cwnd) {
7792                                 /* skip this network, no room - can't fill */
7793                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
7794                                         sctp_log_cwnd(stcb, net, 3,
7795                                             SCTP_CWND_LOG_FILL_OUTQ_CALLED);
7796                                 }
7797                                 continue;
7798                         }
7799                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
7800                                 sctp_log_cwnd(stcb, net, 4, SCTP_CWND_LOG_FILL_OUTQ_CALLED);
7801                         }
7802                         sctp_fill_outqueue(stcb, net, frag_point, eeor_mode, &quit_now, so_locked);
7803                         if (quit_now) {
7804                                 /* memory alloc failure */
7805                                 no_data_chunks = 1;
7806                                 break;
7807                         }
7808                 }
7809         }
7810         /* now service each destination and send out what we can for it */
7811         /* Nothing to send? */
7812         if (TAILQ_EMPTY(&asoc->control_send_queue) &&
7813             TAILQ_EMPTY(&asoc->asconf_send_queue) &&
7814             TAILQ_EMPTY(&asoc->send_queue)) {
7815                 *reason_code = 8;
7816                 return (0);
7817         }
7818         if (asoc->sctp_cmt_on_off > 0) {
7819                 /* get the last start point */
7820                 start_at = asoc->last_net_cmt_send_started;
7821                 if (start_at == NULL) {
7822                         /* null so to beginning */
7823                         start_at = TAILQ_FIRST(&asoc->nets);
7824                 } else {
7825                         start_at = TAILQ_NEXT(asoc->last_net_cmt_send_started, sctp_next);
7826                         if (start_at == NULL) {
7827                                 start_at = TAILQ_FIRST(&asoc->nets);
7828                         }
7829                 }
7830                 asoc->last_net_cmt_send_started = start_at;
7831         } else {
7832                 start_at = TAILQ_FIRST(&asoc->nets);
7833         }
7834         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
7835                 if (chk->whoTo == NULL) {
7836                         if (asoc->alternate) {
7837                                 chk->whoTo = asoc->alternate;
7838                         } else {
7839                                 chk->whoTo = asoc->primary_destination;
7840                         }
7841                         atomic_add_int(&chk->whoTo->ref_count, 1);
7842                 }
7843         }
7844         old_start_at = NULL;
7845 again_one_more_time:
7846         for (net = start_at; net != NULL; net = TAILQ_NEXT(net, sctp_next)) {
7847                 /* how much can we send? */
7848                 /* SCTPDBG("Examine for sending net:%x\n", (uint32_t)net); */
7849                 if (old_start_at && (old_start_at == net)) {
7850                         /* through list ocmpletely. */
7851                         break;
7852                 }
7853                 tsns_sent = 0xa;
7854                 if (TAILQ_EMPTY(&asoc->control_send_queue) &&
7855                     TAILQ_EMPTY(&asoc->asconf_send_queue) &&
7856                     (net->flight_size >= net->cwnd)) {
7857                         /*
7858                          * Nothing on control or asconf and flight is full,
7859                          * we can skip even in the CMT case.
7860                          */
7861                         continue;
7862                 }
7863                 bundle_at = 0;
7864                 endoutchain = outchain = NULL;
7865                 no_fragmentflg = 1;
7866                 one_chunk = 0;
7867                 if (net->dest_state & SCTP_ADDR_UNCONFIRMED) {
7868                         skip_data_for_this_net = 1;
7869                 } else {
7870                         skip_data_for_this_net = 0;
7871                 }
7872                 if ((net->ro.ro_rt) && (net->ro.ro_rt->rt_ifp)) {
7873                         /*
7874                          * if we have a route and an ifp check to see if we
7875                          * have room to send to this guy
7876                          */
7877                         struct ifnet *ifp;
7878
7879                         ifp = net->ro.ro_rt->rt_ifp;
7880                         if ((ifp->if_snd.ifq_len + 2) >= ifp->if_snd.ifq_maxlen) {
7881                                 SCTP_STAT_INCR(sctps_ifnomemqueued);
7882                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_MAXBURST_ENABLE) {
7883                                         sctp_log_maxburst(stcb, net, ifp->if_snd.ifq_len, ifp->if_snd.ifq_maxlen, SCTP_MAX_IFP_APPLIED);
7884                                 }
7885                                 continue;
7886                         }
7887                 }
7888                 switch (((struct sockaddr *)&net->ro._l_addr)->sa_family) {
7889 #ifdef INET
7890                 case AF_INET:
7891                         mtu = net->mtu - (sizeof(struct ip) + sizeof(struct sctphdr));
7892                         break;
7893 #endif
7894 #ifdef INET6
7895                 case AF_INET6:
7896                         mtu = net->mtu - (sizeof(struct ip6_hdr) + sizeof(struct sctphdr));
7897                         break;
7898 #endif
7899                 default:
7900                         /* TSNH */
7901                         mtu = net->mtu;
7902                         break;
7903                 }
7904                 mx_mtu = mtu;
7905                 to_out = 0;
7906                 if (mtu > asoc->peers_rwnd) {
7907                         if (asoc->total_flight > 0) {
7908                                 /* We have a packet in flight somewhere */
7909                                 r_mtu = asoc->peers_rwnd;
7910                         } else {
7911                                 /* We are always allowed to send one MTU out */
7912                                 one_chunk = 1;
7913                                 r_mtu = mtu;
7914                         }
7915                 } else {
7916                         r_mtu = mtu;
7917                 }
7918                 /************************/
7919                 /* ASCONF transmission */
7920                 /************************/
7921                 /* Now first lets go through the asconf queue */
7922                 TAILQ_FOREACH_SAFE(chk, &asoc->asconf_send_queue, sctp_next, nchk) {
7923                         if (chk->rec.chunk_id.id != SCTP_ASCONF) {
7924                                 continue;
7925                         }
7926                         if (chk->whoTo == NULL) {
7927                                 if (asoc->alternate == NULL) {
7928                                         if (asoc->primary_destination != net) {
7929                                                 break;
7930                                         }
7931                                 } else {
7932                                         if (asoc->alternate != net) {
7933                                                 break;
7934                                         }
7935                                 }
7936                         } else {
7937                                 if (chk->whoTo != net) {
7938                                         break;
7939                                 }
7940                         }
7941                         if (chk->data == NULL) {
7942                                 break;
7943                         }
7944                         if (chk->sent != SCTP_DATAGRAM_UNSENT &&
7945                             chk->sent != SCTP_DATAGRAM_RESEND) {
7946                                 break;
7947                         }
7948                         /*
7949                          * if no AUTH is yet included and this chunk
7950                          * requires it, make sure to account for it.  We
7951                          * don't apply the size until the AUTH chunk is
7952                          * actually added below in case there is no room for
7953                          * this chunk. NOTE: we overload the use of "omtu"
7954                          * here
7955                          */
7956                         if ((auth == NULL) &&
7957                             sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
7958                             stcb->asoc.peer_auth_chunks)) {
7959                                 omtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
7960                         } else
7961                                 omtu = 0;
7962                         /* Here we do NOT factor the r_mtu */
7963                         if ((chk->send_size < (int)(mtu - omtu)) ||
7964                             (chk->flags & CHUNK_FLAGS_FRAGMENT_OK)) {
7965                                 /*
7966                                  * We probably should glom the mbuf chain
7967                                  * from the chk->data for control but the
7968                                  * problem is it becomes yet one more level
7969                                  * of tracking to do if for some reason
7970                                  * output fails. Then I have got to
7971                                  * reconstruct the merged control chain.. el
7972                                  * yucko.. for now we take the easy way and
7973                                  * do the copy
7974                                  */
7975                                 /*
7976                                  * Add an AUTH chunk, if chunk requires it
7977                                  * save the offset into the chain for AUTH
7978                                  */
7979                                 if ((auth == NULL) &&
7980                                     (sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
7981                                     stcb->asoc.peer_auth_chunks))) {
7982                                         outchain = sctp_add_auth_chunk(outchain,
7983                                             &endoutchain,
7984                                             &auth,
7985                                             &auth_offset,
7986                                             stcb,
7987                                             chk->rec.chunk_id.id);
7988                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
7989                                 }
7990                                 outchain = sctp_copy_mbufchain(chk->data, outchain, &endoutchain,
7991                                     (int)chk->rec.chunk_id.can_take_data,
7992                                     chk->send_size, chk->copy_by_ref);
7993                                 if (outchain == NULL) {
7994                                         *reason_code = 8;
7995                                         SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
7996                                         return (ENOMEM);
7997                                 }
7998                                 SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
7999                                 /* update our MTU size */
8000                                 if (mtu > (chk->send_size + omtu))
8001                                         mtu -= (chk->send_size + omtu);
8002                                 else
8003                                         mtu = 0;
8004                                 to_out += (chk->send_size + omtu);
8005                                 /* Do clear IP_DF ? */
8006                                 if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
8007                                         no_fragmentflg = 0;
8008                                 }
8009                                 if (chk->rec.chunk_id.can_take_data)
8010                                         chk->data = NULL;
8011                                 /*
8012                                  * set hb flag since we can use these for
8013                                  * RTO
8014                                  */
8015                                 hbflag = 1;
8016                                 asconf = 1;
8017                                 /*
8018                                  * should sysctl this: don't bundle data
8019                                  * with ASCONF since it requires AUTH
8020                                  */
8021                                 no_data_chunks = 1;
8022                                 chk->sent = SCTP_DATAGRAM_SENT;
8023                                 if (chk->whoTo == NULL) {
8024                                         chk->whoTo = net;
8025                                         atomic_add_int(&net->ref_count, 1);
8026                                 }
8027                                 chk->snd_count++;
8028                                 if (mtu == 0) {
8029                                         /*
8030                                          * Ok we are out of room but we can
8031                                          * output without effecting the
8032                                          * flight size since this little guy
8033                                          * is a control only packet.
8034                                          */
8035                                         sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp, stcb, net);
8036                                         /*
8037                                          * do NOT clear the asconf flag as
8038                                          * it is used to do appropriate
8039                                          * source address selection.
8040                                          */
8041                                         if ((error = sctp_lowlevel_chunk_output(inp, stcb, net,
8042                                             (struct sockaddr *)&net->ro._l_addr,
8043                                             outchain, auth_offset, auth,
8044                                             stcb->asoc.authinfo.active_keyid,
8045                                             no_fragmentflg, 0, asconf,
8046                                             inp->sctp_lport, stcb->rport,
8047                                             htonl(stcb->asoc.peer_vtag),
8048                                             net->port, NULL,
8049                                             0, 0,
8050                                             so_locked))) {
8051                                                 if (error == ENOBUFS) {
8052                                                         asoc->ifp_had_enobuf = 1;
8053                                                         SCTP_STAT_INCR(sctps_lowlevelerr);
8054                                                 }
8055                                                 if (from_where == 0) {
8056                                                         SCTP_STAT_INCR(sctps_lowlevelerrusr);
8057                                                 }
8058                                                 if (*now_filled == 0) {
8059                                                         (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
8060                                                         *now_filled = 1;
8061                                                         *now = net->last_sent_time;
8062                                                 } else {
8063                                                         net->last_sent_time = *now;
8064                                                 }
8065                                                 hbflag = 0;
8066                                                 /* error, could not output */
8067                                                 if (error == EHOSTUNREACH) {
8068                                                         /*
8069                                                          * Destination went
8070                                                          * unreachable
8071                                                          * during this send
8072                                                          */
8073                                                         sctp_move_chunks_from_net(stcb, net);
8074                                                 }
8075                                                 *reason_code = 7;
8076                                                 continue;
8077                                         } else
8078                                                 asoc->ifp_had_enobuf = 0;
8079                                         if (*now_filled == 0) {
8080                                                 (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
8081                                                 *now_filled = 1;
8082                                                 *now = net->last_sent_time;
8083                                         } else {
8084                                                 net->last_sent_time = *now;
8085                                         }
8086                                         hbflag = 0;
8087                                         /*
8088                                          * increase the number we sent, if a
8089                                          * cookie is sent we don't tell them
8090                                          * any was sent out.
8091                                          */
8092                                         outchain = endoutchain = NULL;
8093                                         auth = NULL;
8094                                         auth_offset = 0;
8095                                         if (!no_out_cnt)
8096                                                 *num_out += ctl_cnt;
8097                                         /* recalc a clean slate and setup */
8098                                         switch (net->ro._l_addr.sa.sa_family) {
8099 #ifdef INET
8100                                         case AF_INET:
8101                                                 mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
8102                                                 break;
8103 #endif
8104 #ifdef INET6
8105                                         case AF_INET6:
8106                                                 mtu = net->mtu - SCTP_MIN_OVERHEAD;
8107                                                 break;
8108 #endif
8109                                         default:
8110                                                 /* TSNH */
8111                                                 mtu = net->mtu;
8112                                                 break;
8113                                         }
8114                                         to_out = 0;
8115                                         no_fragmentflg = 1;
8116                                 }
8117                         }
8118                 }
8119                 /************************/
8120                 /* Control transmission */
8121                 /************************/
8122                 /* Now first lets go through the control queue */
8123                 TAILQ_FOREACH_SAFE(chk, &asoc->control_send_queue, sctp_next, nchk) {
8124                         if ((sack_goes_to) &&
8125                             (chk->rec.chunk_id.id == SCTP_ECN_ECHO) &&
8126                             (chk->whoTo != sack_goes_to)) {
8127                                 /*
8128                                  * if we have a sack in queue, and we are
8129                                  * looking at an ecn echo that is NOT queued
8130                                  * to where the sack is going..
8131                                  */
8132                                 if (chk->whoTo == net) {
8133                                         /*
8134                                          * Don't transmit it to where its
8135                                          * going (current net)
8136                                          */
8137                                         continue;
8138                                 } else if (sack_goes_to == net) {
8139                                         /*
8140                                          * But do transmit it to this
8141                                          * address
8142                                          */
8143                                         goto skip_net_check;
8144                                 }
8145                         }
8146                         if (chk->whoTo == NULL) {
8147                                 if (asoc->alternate == NULL) {
8148                                         if (asoc->primary_destination != net) {
8149                                                 continue;
8150                                         }
8151                                 } else {
8152                                         if (asoc->alternate != net) {
8153                                                 continue;
8154                                         }
8155                                 }
8156                         } else {
8157                                 if (chk->whoTo != net) {
8158                                         continue;
8159                                 }
8160                         }
8161         skip_net_check:
8162                         if (chk->data == NULL) {
8163                                 continue;
8164                         }
8165                         if (chk->sent != SCTP_DATAGRAM_UNSENT) {
8166                                 /*
8167                                  * It must be unsent. Cookies and ASCONF's
8168                                  * hang around but there timers will force
8169                                  * when marked for resend.
8170                                  */
8171                                 continue;
8172                         }
8173                         /*
8174                          * if no AUTH is yet included and this chunk
8175                          * requires it, make sure to account for it.  We
8176                          * don't apply the size until the AUTH chunk is
8177                          * actually added below in case there is no room for
8178                          * this chunk. NOTE: we overload the use of "omtu"
8179                          * here
8180                          */
8181                         if ((auth == NULL) &&
8182                             sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
8183                             stcb->asoc.peer_auth_chunks)) {
8184                                 omtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
8185                         } else
8186                                 omtu = 0;
8187                         /* Here we do NOT factor the r_mtu */
8188                         if ((chk->send_size <= (int)(mtu - omtu)) ||
8189                             (chk->flags & CHUNK_FLAGS_FRAGMENT_OK)) {
8190                                 /*
8191                                  * We probably should glom the mbuf chain
8192                                  * from the chk->data for control but the
8193                                  * problem is it becomes yet one more level
8194                                  * of tracking to do if for some reason
8195                                  * output fails. Then I have got to
8196                                  * reconstruct the merged control chain.. el
8197                                  * yucko.. for now we take the easy way and
8198                                  * do the copy
8199                                  */
8200                                 /*
8201                                  * Add an AUTH chunk, if chunk requires it
8202                                  * save the offset into the chain for AUTH
8203                                  */
8204                                 if ((auth == NULL) &&
8205                                     (sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
8206                                     stcb->asoc.peer_auth_chunks))) {
8207                                         outchain = sctp_add_auth_chunk(outchain,
8208                                             &endoutchain,
8209                                             &auth,
8210                                             &auth_offset,
8211                                             stcb,
8212                                             chk->rec.chunk_id.id);
8213                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8214                                 }
8215                                 outchain = sctp_copy_mbufchain(chk->data, outchain, &endoutchain,
8216                                     (int)chk->rec.chunk_id.can_take_data,
8217                                     chk->send_size, chk->copy_by_ref);
8218                                 if (outchain == NULL) {
8219                                         *reason_code = 8;
8220                                         SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
8221                                         return (ENOMEM);
8222                                 }
8223                                 SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8224                                 /* update our MTU size */
8225                                 if (mtu > (chk->send_size + omtu))
8226                                         mtu -= (chk->send_size + omtu);
8227                                 else
8228                                         mtu = 0;
8229                                 to_out += (chk->send_size + omtu);
8230                                 /* Do clear IP_DF ? */
8231                                 if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
8232                                         no_fragmentflg = 0;
8233                                 }
8234                                 if (chk->rec.chunk_id.can_take_data)
8235                                         chk->data = NULL;
8236                                 /* Mark things to be removed, if needed */
8237                                 if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
8238                                     (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK) ||  /* EY */
8239                                     (chk->rec.chunk_id.id == SCTP_HEARTBEAT_REQUEST) ||
8240                                     (chk->rec.chunk_id.id == SCTP_HEARTBEAT_ACK) ||
8241                                     (chk->rec.chunk_id.id == SCTP_SHUTDOWN) ||
8242                                     (chk->rec.chunk_id.id == SCTP_SHUTDOWN_ACK) ||
8243                                     (chk->rec.chunk_id.id == SCTP_OPERATION_ERROR) ||
8244                                     (chk->rec.chunk_id.id == SCTP_COOKIE_ACK) ||
8245                                     (chk->rec.chunk_id.id == SCTP_ECN_CWR) ||
8246                                     (chk->rec.chunk_id.id == SCTP_PACKET_DROPPED) ||
8247                                     (chk->rec.chunk_id.id == SCTP_ASCONF_ACK)) {
8248                                         if (chk->rec.chunk_id.id == SCTP_HEARTBEAT_REQUEST) {
8249                                                 hbflag = 1;
8250                                         }
8251                                         /* remove these chunks at the end */
8252                                         if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
8253                                             (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK)) {
8254                                                 /* turn off the timer */
8255                                                 if (SCTP_OS_TIMER_PENDING(&stcb->asoc.dack_timer.timer)) {
8256                                                         sctp_timer_stop(SCTP_TIMER_TYPE_RECV,
8257                                                             inp, stcb, net, SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_1);
8258                                                 }
8259                                         }
8260                                         ctl_cnt++;
8261                                 } else {
8262                                         /*
8263                                          * Other chunks, since they have
8264                                          * timers running (i.e. COOKIE) we
8265                                          * just "trust" that it gets sent or
8266                                          * retransmitted.
8267                                          */
8268                                         ctl_cnt++;
8269                                         if (chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
8270                                                 cookie = 1;
8271                                                 no_out_cnt = 1;
8272                                         } else if (chk->rec.chunk_id.id == SCTP_ECN_ECHO) {
8273                                                 /*
8274                                                  * Increment ecne send count
8275                                                  * here this means we may be
8276                                                  * over-zealous in our
8277                                                  * counting if the send
8278                                                  * fails, but its the best
8279                                                  * place to do it (we used
8280                                                  * to do it in the queue of
8281                                                  * the chunk, but that did
8282                                                  * not tell how many times
8283                                                  * it was sent.
8284                                                  */
8285                                                 SCTP_STAT_INCR(sctps_sendecne);
8286                                         }
8287                                         chk->sent = SCTP_DATAGRAM_SENT;
8288                                         if (chk->whoTo == NULL) {
8289                                                 chk->whoTo = net;
8290                                                 atomic_add_int(&net->ref_count, 1);
8291                                         }
8292                                         chk->snd_count++;
8293                                 }
8294                                 if (mtu == 0) {
8295                                         /*
8296                                          * Ok we are out of room but we can
8297                                          * output without effecting the
8298                                          * flight size since this little guy
8299                                          * is a control only packet.
8300                                          */
8301                                         if (asconf) {
8302                                                 sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp, stcb, net);
8303                                                 /*
8304                                                  * do NOT clear the asconf
8305                                                  * flag as it is used to do
8306                                                  * appropriate source
8307                                                  * address selection.
8308                                                  */
8309                                         }
8310                                         if (cookie) {
8311                                                 sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, inp, stcb, net);
8312                                                 cookie = 0;
8313                                         }
8314                                         if ((error = sctp_lowlevel_chunk_output(inp, stcb, net,
8315                                             (struct sockaddr *)&net->ro._l_addr,
8316                                             outchain,
8317                                             auth_offset, auth,
8318                                             stcb->asoc.authinfo.active_keyid,
8319                                             no_fragmentflg, 0, asconf,
8320                                             inp->sctp_lport, stcb->rport,
8321                                             htonl(stcb->asoc.peer_vtag),
8322                                             net->port, NULL,
8323                                             0, 0,
8324                                             so_locked))) {
8325                                                 if (error == ENOBUFS) {
8326                                                         asoc->ifp_had_enobuf = 1;
8327                                                         SCTP_STAT_INCR(sctps_lowlevelerr);
8328                                                 }
8329                                                 if (from_where == 0) {
8330                                                         SCTP_STAT_INCR(sctps_lowlevelerrusr);
8331                                                 }
8332                                                 /* error, could not output */
8333                                                 if (hbflag) {
8334                                                         if (*now_filled == 0) {
8335                                                                 (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
8336                                                                 *now_filled = 1;
8337                                                                 *now = net->last_sent_time;
8338                                                         } else {
8339                                                                 net->last_sent_time = *now;
8340                                                         }
8341                                                         hbflag = 0;
8342                                                 }
8343                                                 if (error == EHOSTUNREACH) {
8344                                                         /*
8345                                                          * Destination went
8346                                                          * unreachable
8347                                                          * during this send
8348                                                          */
8349                                                         sctp_move_chunks_from_net(stcb, net);
8350                                                 }
8351                                                 *reason_code = 7;
8352                                                 continue;
8353                                         } else
8354                                                 asoc->ifp_had_enobuf = 0;
8355                                         /* Only HB or ASCONF advances time */
8356                                         if (hbflag) {
8357                                                 if (*now_filled == 0) {
8358                                                         (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
8359                                                         *now_filled = 1;
8360                                                         *now = net->last_sent_time;
8361                                                 } else {
8362                                                         net->last_sent_time = *now;
8363                                                 }
8364                                                 hbflag = 0;
8365                                         }
8366                                         /*
8367                                          * increase the number we sent, if a
8368                                          * cookie is sent we don't tell them
8369                                          * any was sent out.
8370                                          */
8371                                         outchain = endoutchain = NULL;
8372                                         auth = NULL;
8373                                         auth_offset = 0;
8374                                         if (!no_out_cnt)
8375                                                 *num_out += ctl_cnt;
8376                                         /* recalc a clean slate and setup */
8377                                         switch (net->ro._l_addr.sa.sa_family) {
8378 #ifdef INET
8379                                         case AF_INET:
8380                                                 mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
8381                                                 break;
8382 #endif
8383 #ifdef INET6
8384                                         case AF_INET6:
8385                                                 mtu = net->mtu - SCTP_MIN_OVERHEAD;
8386                                                 break;
8387 #endif
8388                                         default:
8389                                                 /* TSNH */
8390                                                 mtu = net->mtu;
8391                                                 break;
8392                                         }
8393                                         to_out = 0;
8394                                         no_fragmentflg = 1;
8395                                 }
8396                         }
8397                 }
8398                 /* JRI: if dest is in PF state, do not send data to it */
8399                 if ((asoc->sctp_cmt_on_off > 0) &&
8400                     (net != stcb->asoc.alternate) &&
8401                     (net->dest_state & SCTP_ADDR_PF)) {
8402                         goto no_data_fill;
8403                 }
8404                 if (net->flight_size >= net->cwnd) {
8405                         goto no_data_fill;
8406                 }
8407                 if ((asoc->sctp_cmt_on_off > 0) &&
8408                     (SCTP_BASE_SYSCTL(sctp_buffer_splitting) & SCTP_RECV_BUFFER_SPLITTING) &&
8409                     (net->flight_size > max_rwnd_per_dest)) {
8410                         goto no_data_fill;
8411                 }
8412                 /*
8413                  * We need a specific accounting for the usage of the send
8414                  * buffer. We also need to check the number of messages per
8415                  * net. For now, this is better than nothing and it disabled
8416                  * by default...
8417                  */
8418                 if ((asoc->sctp_cmt_on_off > 0) &&
8419                     (SCTP_BASE_SYSCTL(sctp_buffer_splitting) & SCTP_SEND_BUFFER_SPLITTING) &&
8420                     (max_send_per_dest > 0) &&
8421                     (net->flight_size > max_send_per_dest)) {
8422                         goto no_data_fill;
8423                 }
8424                 /*********************/
8425                 /* Data transmission */
8426                 /*********************/
8427                 /*
8428                  * if AUTH for DATA is required and no AUTH has been added
8429                  * yet, account for this in the mtu now... if no data can be
8430                  * bundled, this adjustment won't matter anyways since the
8431                  * packet will be going out...
8432                  */
8433                 data_auth_reqd = sctp_auth_is_required_chunk(SCTP_DATA,
8434                     stcb->asoc.peer_auth_chunks);
8435                 if (data_auth_reqd && (auth == NULL)) {
8436                         mtu -= sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
8437                 }
8438                 /* now lets add any data within the MTU constraints */
8439                 switch (((struct sockaddr *)&net->ro._l_addr)->sa_family) {
8440                 case AF_INET:
8441                         if (net->mtu > (sizeof(struct ip) + sizeof(struct sctphdr)))
8442                                 omtu = net->mtu - (sizeof(struct ip) + sizeof(struct sctphdr));
8443                         else
8444                                 omtu = 0;
8445                         break;
8446 #ifdef INET6
8447                 case AF_INET6:
8448                         if (net->mtu > (sizeof(struct ip6_hdr) + sizeof(struct sctphdr)))
8449                                 omtu = net->mtu - (sizeof(struct ip6_hdr) + sizeof(struct sctphdr));
8450                         else
8451                                 omtu = 0;
8452                         break;
8453 #endif
8454                 default:
8455                         /* TSNH */
8456                         omtu = 0;
8457                         break;
8458                 }
8459                 if ((((asoc->state & SCTP_STATE_OPEN) == SCTP_STATE_OPEN) &&
8460                     (skip_data_for_this_net == 0)) ||
8461                     (cookie)) {
8462                         TAILQ_FOREACH_SAFE(chk, &asoc->send_queue, sctp_next, nchk) {
8463                                 if (no_data_chunks) {
8464                                         /* let only control go out */
8465                                         *reason_code = 1;
8466                                         break;
8467                                 }
8468                                 if (net->flight_size >= net->cwnd) {
8469                                         /* skip this net, no room for data */
8470                                         *reason_code = 2;
8471                                         break;
8472                                 }
8473                                 if ((chk->whoTo != NULL) &&
8474                                     (chk->whoTo != net)) {
8475                                         /* Don't send the chunk on this net */
8476                                         continue;
8477                                 }
8478                                 if (asoc->sctp_cmt_on_off == 0) {
8479                                         if ((asoc->alternate) &&
8480                                             (asoc->alternate != net) &&
8481                                             (chk->whoTo == NULL)) {
8482                                                 continue;
8483                                         } else if ((net != asoc->primary_destination) &&
8484                                                     (asoc->alternate == NULL) &&
8485                                             (chk->whoTo == NULL)) {
8486                                                 continue;
8487                                         }
8488                                 }
8489                                 if ((chk->send_size > omtu) && ((chk->flags & CHUNK_FLAGS_FRAGMENT_OK) == 0)) {
8490                                         /*-
8491                                          * strange, we have a chunk that is
8492                                          * to big for its destination and
8493                                          * yet no fragment ok flag.
8494                                          * Something went wrong when the
8495                                          * PMTU changed...we did not mark
8496                                          * this chunk for some reason?? I
8497                                          * will fix it here by letting IP
8498                                          * fragment it for now and printing
8499                                          * a warning. This really should not
8500                                          * happen ...
8501                                          */
8502                                         SCTP_PRINTF("Warning chunk of %d bytes > mtu:%d and yet PMTU disc missed\n",
8503                                             chk->send_size, mtu);
8504                                         chk->flags |= CHUNK_FLAGS_FRAGMENT_OK;
8505                                 }
8506                                 if (SCTP_BASE_SYSCTL(sctp_enable_sack_immediately) &&
8507                                     ((asoc->state & SCTP_STATE_SHUTDOWN_PENDING) == SCTP_STATE_SHUTDOWN_PENDING)) {
8508                                         struct sctp_data_chunk *dchkh;
8509
8510                                         dchkh = mtod(chk->data, struct sctp_data_chunk *);
8511                                         dchkh->ch.chunk_flags |= SCTP_DATA_SACK_IMMEDIATELY;
8512                                 }
8513                                 if (((chk->send_size <= mtu) && (chk->send_size <= r_mtu)) ||
8514                                     ((chk->flags & CHUNK_FLAGS_FRAGMENT_OK) && (chk->send_size <= asoc->peers_rwnd))) {
8515                                         /* ok we will add this one */
8516
8517                                         /*
8518                                          * Add an AUTH chunk, if chunk
8519                                          * requires it, save the offset into
8520                                          * the chain for AUTH
8521                                          */
8522                                         if (data_auth_reqd) {
8523                                                 if (auth == NULL) {
8524                                                         outchain = sctp_add_auth_chunk(outchain,
8525                                                             &endoutchain,
8526                                                             &auth,
8527                                                             &auth_offset,
8528                                                             stcb,
8529                                                             SCTP_DATA);
8530                                                         auth_keyid = chk->auth_keyid;
8531                                                         override_ok = 0;
8532                                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8533                                                 } else if (override_ok) {
8534                                                         /*
8535                                                          * use this data's
8536                                                          * keyid
8537                                                          */
8538                                                         auth_keyid = chk->auth_keyid;
8539                                                         override_ok = 0;
8540                                                 } else if (auth_keyid != chk->auth_keyid) {
8541                                                         /*
8542                                                          * different keyid,
8543                                                          * so done bundling
8544                                                          */
8545                                                         break;
8546                                                 }
8547                                         }
8548                                         outchain = sctp_copy_mbufchain(chk->data, outchain, &endoutchain, 0,
8549                                             chk->send_size, chk->copy_by_ref);
8550                                         if (outchain == NULL) {
8551                                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "No memory?\n");
8552                                                 if (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
8553                                                         sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
8554                                                 }
8555                                                 *reason_code = 3;
8556                                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
8557                                                 return (ENOMEM);
8558                                         }
8559                                         /* upate our MTU size */
8560                                         /* Do clear IP_DF ? */
8561                                         if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
8562                                                 no_fragmentflg = 0;
8563                                         }
8564                                         /* unsigned subtraction of mtu */
8565                                         if (mtu > chk->send_size)
8566                                                 mtu -= chk->send_size;
8567                                         else
8568                                                 mtu = 0;
8569                                         /* unsigned subtraction of r_mtu */
8570                                         if (r_mtu > chk->send_size)
8571                                                 r_mtu -= chk->send_size;
8572                                         else
8573                                                 r_mtu = 0;
8574
8575                                         to_out += chk->send_size;
8576                                         if ((to_out > mx_mtu) && no_fragmentflg) {
8577 #ifdef INVARIANTS
8578                                                 panic("Exceeding mtu of %d out size is %d", mx_mtu, to_out);
8579 #else
8580                                                 SCTP_PRINTF("Exceeding mtu of %d out size is %d\n",
8581                                                     mx_mtu, to_out);
8582 #endif
8583                                         }
8584                                         chk->window_probe = 0;
8585                                         data_list[bundle_at++] = chk;
8586                                         if (bundle_at >= SCTP_MAX_DATA_BUNDLING) {
8587                                                 break;
8588                                         }
8589                                         if (chk->sent == SCTP_DATAGRAM_UNSENT) {
8590                                                 if ((chk->rec.data.rcv_flags & SCTP_DATA_UNORDERED) == 0) {
8591                                                         SCTP_STAT_INCR_COUNTER64(sctps_outorderchunks);
8592                                                 } else {
8593                                                         SCTP_STAT_INCR_COUNTER64(sctps_outunorderchunks);
8594                                                 }
8595                                                 if (((chk->rec.data.rcv_flags & SCTP_DATA_LAST_FRAG) == SCTP_DATA_LAST_FRAG) &&
8596                                                     ((chk->rec.data.rcv_flags & SCTP_DATA_FIRST_FRAG) == 0))
8597                                                         /*
8598                                                          * Count number of
8599                                                          * user msg's that
8600                                                          * were fragmented
8601                                                          * we do this by
8602                                                          * counting when we
8603                                                          * see a LAST
8604                                                          * fragment only.
8605                                                          */
8606                                                         SCTP_STAT_INCR_COUNTER64(sctps_fragusrmsgs);
8607                                         }
8608                                         if ((mtu == 0) || (r_mtu == 0) || (one_chunk)) {
8609                                                 if ((one_chunk) && (stcb->asoc.total_flight == 0)) {
8610                                                         data_list[0]->window_probe = 1;
8611                                                         net->window_probe = 1;
8612                                                 }
8613                                                 break;
8614                                         }
8615                                 } else {
8616                                         /*
8617                                          * Must be sent in order of the
8618                                          * TSN's (on a network)
8619                                          */
8620                                         break;
8621                                 }
8622                         }       /* for (chunk gather loop for this net) */
8623                 }               /* if asoc.state OPEN */
8624 no_data_fill:
8625                 /* Is there something to send for this destination? */
8626                 if (outchain) {
8627                         /* We may need to start a control timer or two */
8628                         if (asconf) {
8629                                 sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp,
8630                                     stcb, net);
8631                                 /*
8632                                  * do NOT clear the asconf flag as it is
8633                                  * used to do appropriate source address
8634                                  * selection.
8635                                  */
8636                         }
8637                         if (cookie) {
8638                                 sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, inp, stcb, net);
8639                                 cookie = 0;
8640                         }
8641                         /* must start a send timer if data is being sent */
8642                         if (bundle_at && (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer))) {
8643                                 /*
8644                                  * no timer running on this destination
8645                                  * restart it.
8646                                  */
8647                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
8648                         }
8649                         /* Now send it, if there is anything to send :> */
8650                         if ((error = sctp_lowlevel_chunk_output(inp,
8651                             stcb,
8652                             net,
8653                             (struct sockaddr *)&net->ro._l_addr,
8654                             outchain,
8655                             auth_offset,
8656                             auth,
8657                             auth_keyid,
8658                             no_fragmentflg,
8659                             bundle_at,
8660                             asconf,
8661                             inp->sctp_lport, stcb->rport,
8662                             htonl(stcb->asoc.peer_vtag),
8663                             net->port, NULL,
8664                             0, 0,
8665                             so_locked))) {
8666                                 /* error, we could not output */
8667                                 if (error == ENOBUFS) {
8668                                         SCTP_STAT_INCR(sctps_lowlevelerr);
8669                                         asoc->ifp_had_enobuf = 1;
8670                                 }
8671                                 if (from_where == 0) {
8672                                         SCTP_STAT_INCR(sctps_lowlevelerrusr);
8673                                 }
8674                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
8675                                 if (hbflag) {
8676                                         if (*now_filled == 0) {
8677                                                 (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
8678                                                 *now_filled = 1;
8679                                                 *now = net->last_sent_time;
8680                                         } else {
8681                                                 net->last_sent_time = *now;
8682                                         }
8683                                         hbflag = 0;
8684                                 }
8685                                 if (error == EHOSTUNREACH) {
8686                                         /*
8687                                          * Destination went unreachable
8688                                          * during this send
8689                                          */
8690                                         sctp_move_chunks_from_net(stcb, net);
8691                                 }
8692                                 *reason_code = 6;
8693                                 /*-
8694                                  * I add this line to be paranoid. As far as
8695                                  * I can tell the continue, takes us back to
8696                                  * the top of the for, but just to make sure
8697                                  * I will reset these again here.
8698                                  */
8699                                 ctl_cnt = bundle_at = 0;
8700                                 continue;       /* This takes us back to the
8701                                                  * for() for the nets. */
8702                         } else {
8703                                 asoc->ifp_had_enobuf = 0;
8704                         }
8705                         endoutchain = NULL;
8706                         auth = NULL;
8707                         auth_offset = 0;
8708                         if (bundle_at || hbflag) {
8709                                 /* For data/asconf and hb set time */
8710                                 if (*now_filled == 0) {
8711                                         (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
8712                                         *now_filled = 1;
8713                                         *now = net->last_sent_time;
8714                                 } else {
8715                                         net->last_sent_time = *now;
8716                                 }
8717                         }
8718                         if (!no_out_cnt) {
8719                                 *num_out += (ctl_cnt + bundle_at);
8720                         }
8721                         if (bundle_at) {
8722                                 /* setup for a RTO measurement */
8723                                 tsns_sent = data_list[0]->rec.data.TSN_seq;
8724                                 /* fill time if not already filled */
8725                                 if (*now_filled == 0) {
8726                                         (void)SCTP_GETTIME_TIMEVAL(&asoc->time_last_sent);
8727                                         *now_filled = 1;
8728                                         *now = asoc->time_last_sent;
8729                                 } else {
8730                                         asoc->time_last_sent = *now;
8731                                 }
8732                                 if (net->rto_needed) {
8733                                         data_list[0]->do_rtt = 1;
8734                                         net->rto_needed = 0;
8735                                 }
8736                                 SCTP_STAT_INCR_BY(sctps_senddata, bundle_at);
8737                                 sctp_clean_up_datalist(stcb, asoc, data_list, bundle_at, net);
8738                         }
8739                         if (one_chunk) {
8740                                 break;
8741                         }
8742                 }
8743                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
8744                         sctp_log_cwnd(stcb, net, tsns_sent, SCTP_CWND_LOG_FROM_SEND);
8745                 }
8746         }
8747         if (old_start_at == NULL) {
8748                 old_start_at = start_at;
8749                 start_at = TAILQ_FIRST(&asoc->nets);
8750                 if (old_start_at)
8751                         goto again_one_more_time;
8752         }
8753         /*
8754          * At the end there should be no NON timed chunks hanging on this
8755          * queue.
8756          */
8757         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
8758                 sctp_log_cwnd(stcb, net, *num_out, SCTP_CWND_LOG_FROM_SEND);
8759         }
8760         if ((*num_out == 0) && (*reason_code == 0)) {
8761                 *reason_code = 4;
8762         } else {
8763                 *reason_code = 5;
8764         }
8765         sctp_clean_up_ctl(stcb, asoc, so_locked);
8766         return (0);
8767 }
8768
8769 void
8770 sctp_queue_op_err(struct sctp_tcb *stcb, struct mbuf *op_err)
8771 {
8772         /*-
8773          * Prepend a OPERATIONAL_ERROR chunk header and put on the end of
8774          * the control chunk queue.
8775          */
8776         struct sctp_chunkhdr *hdr;
8777         struct sctp_tmit_chunk *chk;
8778         struct mbuf *mat;
8779
8780         SCTP_TCB_LOCK_ASSERT(stcb);
8781         sctp_alloc_a_chunk(stcb, chk);
8782         if (chk == NULL) {
8783                 /* no memory */
8784                 sctp_m_freem(op_err);
8785                 return;
8786         }
8787         chk->copy_by_ref = 0;
8788         SCTP_BUF_PREPEND(op_err, sizeof(struct sctp_chunkhdr), M_DONTWAIT);
8789         if (op_err == NULL) {
8790                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
8791                 return;
8792         }
8793         chk->send_size = 0;
8794         mat = op_err;
8795         while (mat != NULL) {
8796                 chk->send_size += SCTP_BUF_LEN(mat);
8797                 mat = SCTP_BUF_NEXT(mat);
8798         }
8799         chk->rec.chunk_id.id = SCTP_OPERATION_ERROR;
8800         chk->rec.chunk_id.can_take_data = 1;
8801         chk->sent = SCTP_DATAGRAM_UNSENT;
8802         chk->snd_count = 0;
8803         chk->flags = 0;
8804         chk->asoc = &stcb->asoc;
8805         chk->data = op_err;
8806         chk->whoTo = NULL;
8807         hdr = mtod(op_err, struct sctp_chunkhdr *);
8808         hdr->chunk_type = SCTP_OPERATION_ERROR;
8809         hdr->chunk_flags = 0;
8810         hdr->chunk_length = htons(chk->send_size);
8811         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue,
8812             chk,
8813             sctp_next);
8814         chk->asoc->ctrl_queue_cnt++;
8815 }
8816
8817 int
8818 sctp_send_cookie_echo(struct mbuf *m,
8819     int offset,
8820     struct sctp_tcb *stcb,
8821     struct sctp_nets *net)
8822 {
8823         /*-
8824          * pull out the cookie and put it at the front of the control chunk
8825          * queue.
8826          */
8827         int at;
8828         struct mbuf *cookie;
8829         struct sctp_paramhdr parm, *phdr;
8830         struct sctp_chunkhdr *hdr;
8831         struct sctp_tmit_chunk *chk;
8832         uint16_t ptype, plen;
8833
8834         /* First find the cookie in the param area */
8835         cookie = NULL;
8836         at = offset + sizeof(struct sctp_init_chunk);
8837
8838         SCTP_TCB_LOCK_ASSERT(stcb);
8839         do {
8840                 phdr = sctp_get_next_param(m, at, &parm, sizeof(parm));
8841                 if (phdr == NULL) {
8842                         return (-3);
8843                 }
8844                 ptype = ntohs(phdr->param_type);
8845                 plen = ntohs(phdr->param_length);
8846                 if (ptype == SCTP_STATE_COOKIE) {
8847                         int pad;
8848
8849                         /* found the cookie */
8850                         if ((pad = (plen % 4))) {
8851                                 plen += 4 - pad;
8852                         }
8853                         cookie = SCTP_M_COPYM(m, at, plen, M_DONTWAIT);
8854                         if (cookie == NULL) {
8855                                 /* No memory */
8856                                 return (-2);
8857                         }
8858 #ifdef SCTP_MBUF_LOGGING
8859                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
8860                                 struct mbuf *mat;
8861
8862                                 for (mat = cookie; mat; mat = SCTP_BUF_NEXT(mat)) {
8863                                         if (SCTP_BUF_IS_EXTENDED(mat)) {
8864                                                 sctp_log_mb(mat, SCTP_MBUF_ICOPY);
8865                                         }
8866                                 }
8867                         }
8868 #endif
8869                         break;
8870                 }
8871                 at += SCTP_SIZE32(plen);
8872         } while (phdr);
8873         if (cookie == NULL) {
8874                 /* Did not find the cookie */
8875                 return (-3);
8876         }
8877         /* ok, we got the cookie lets change it into a cookie echo chunk */
8878
8879         /* first the change from param to cookie */
8880         hdr = mtod(cookie, struct sctp_chunkhdr *);
8881         hdr->chunk_type = SCTP_COOKIE_ECHO;
8882         hdr->chunk_flags = 0;
8883         /* get the chunk stuff now and place it in the FRONT of the queue */
8884         sctp_alloc_a_chunk(stcb, chk);
8885         if (chk == NULL) {
8886                 /* no memory */
8887                 sctp_m_freem(cookie);
8888                 return (-5);
8889         }
8890         chk->copy_by_ref = 0;
8891         chk->send_size = plen;
8892         chk->rec.chunk_id.id = SCTP_COOKIE_ECHO;
8893         chk->rec.chunk_id.can_take_data = 0;
8894         chk->sent = SCTP_DATAGRAM_UNSENT;
8895         chk->snd_count = 0;
8896         chk->flags = CHUNK_FLAGS_FRAGMENT_OK;
8897         chk->asoc = &stcb->asoc;
8898         chk->data = cookie;
8899         chk->whoTo = net;
8900         atomic_add_int(&chk->whoTo->ref_count, 1);
8901         TAILQ_INSERT_HEAD(&chk->asoc->control_send_queue, chk, sctp_next);
8902         chk->asoc->ctrl_queue_cnt++;
8903         return (0);
8904 }
8905
8906 void
8907 sctp_send_heartbeat_ack(struct sctp_tcb *stcb,
8908     struct mbuf *m,
8909     int offset,
8910     int chk_length,
8911     struct sctp_nets *net)
8912 {
8913         /*
8914          * take a HB request and make it into a HB ack and send it.
8915          */
8916         struct mbuf *outchain;
8917         struct sctp_chunkhdr *chdr;
8918         struct sctp_tmit_chunk *chk;
8919
8920
8921         if (net == NULL)
8922                 /* must have a net pointer */
8923                 return;
8924
8925         outchain = SCTP_M_COPYM(m, offset, chk_length, M_DONTWAIT);
8926         if (outchain == NULL) {
8927                 /* gak out of memory */
8928                 return;
8929         }
8930 #ifdef SCTP_MBUF_LOGGING
8931         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
8932                 struct mbuf *mat;
8933
8934                 for (mat = outchain; mat; mat = SCTP_BUF_NEXT(mat)) {
8935                         if (SCTP_BUF_IS_EXTENDED(mat)) {
8936                                 sctp_log_mb(mat, SCTP_MBUF_ICOPY);
8937                         }
8938                 }
8939         }
8940 #endif
8941         chdr = mtod(outchain, struct sctp_chunkhdr *);
8942         chdr->chunk_type = SCTP_HEARTBEAT_ACK;
8943         chdr->chunk_flags = 0;
8944         if (chk_length % 4) {
8945                 /* need pad */
8946                 uint32_t cpthis = 0;
8947                 int padlen;
8948
8949                 padlen = 4 - (chk_length % 4);
8950                 m_copyback(outchain, chk_length, padlen, (caddr_t)&cpthis);
8951         }
8952         sctp_alloc_a_chunk(stcb, chk);
8953         if (chk == NULL) {
8954                 /* no memory */
8955                 sctp_m_freem(outchain);
8956                 return;
8957         }
8958         chk->copy_by_ref = 0;
8959         chk->send_size = chk_length;
8960         chk->rec.chunk_id.id = SCTP_HEARTBEAT_ACK;
8961         chk->rec.chunk_id.can_take_data = 1;
8962         chk->sent = SCTP_DATAGRAM_UNSENT;
8963         chk->snd_count = 0;
8964         chk->flags = 0;
8965         chk->asoc = &stcb->asoc;
8966         chk->data = outchain;
8967         chk->whoTo = net;
8968         atomic_add_int(&chk->whoTo->ref_count, 1);
8969         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
8970         chk->asoc->ctrl_queue_cnt++;
8971 }
8972
8973 void
8974 sctp_send_cookie_ack(struct sctp_tcb *stcb)
8975 {
8976         /* formulate and queue a cookie-ack back to sender */
8977         struct mbuf *cookie_ack;
8978         struct sctp_chunkhdr *hdr;
8979         struct sctp_tmit_chunk *chk;
8980
8981         cookie_ack = NULL;
8982         SCTP_TCB_LOCK_ASSERT(stcb);
8983
8984         cookie_ack = sctp_get_mbuf_for_msg(sizeof(struct sctp_chunkhdr), 0, M_DONTWAIT, 1, MT_HEADER);
8985         if (cookie_ack == NULL) {
8986                 /* no mbuf's */
8987                 return;
8988         }
8989         SCTP_BUF_RESV_UF(cookie_ack, SCTP_MIN_OVERHEAD);
8990         sctp_alloc_a_chunk(stcb, chk);
8991         if (chk == NULL) {
8992                 /* no memory */
8993                 sctp_m_freem(cookie_ack);
8994                 return;
8995         }
8996         chk->copy_by_ref = 0;
8997         chk->send_size = sizeof(struct sctp_chunkhdr);
8998         chk->rec.chunk_id.id = SCTP_COOKIE_ACK;
8999         chk->rec.chunk_id.can_take_data = 1;
9000         chk->sent = SCTP_DATAGRAM_UNSENT;
9001         chk->snd_count = 0;
9002         chk->flags = 0;
9003         chk->asoc = &stcb->asoc;
9004         chk->data = cookie_ack;
9005         if (chk->asoc->last_control_chunk_from != NULL) {
9006                 chk->whoTo = chk->asoc->last_control_chunk_from;
9007                 atomic_add_int(&chk->whoTo->ref_count, 1);
9008         } else {
9009                 chk->whoTo = NULL;
9010         }
9011         hdr = mtod(cookie_ack, struct sctp_chunkhdr *);
9012         hdr->chunk_type = SCTP_COOKIE_ACK;
9013         hdr->chunk_flags = 0;
9014         hdr->chunk_length = htons(chk->send_size);
9015         SCTP_BUF_LEN(cookie_ack) = chk->send_size;
9016         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9017         chk->asoc->ctrl_queue_cnt++;
9018         return;
9019 }
9020
9021
9022 void
9023 sctp_send_shutdown_ack(struct sctp_tcb *stcb, struct sctp_nets *net)
9024 {
9025         /* formulate and queue a SHUTDOWN-ACK back to the sender */
9026         struct mbuf *m_shutdown_ack;
9027         struct sctp_shutdown_ack_chunk *ack_cp;
9028         struct sctp_tmit_chunk *chk;
9029
9030         m_shutdown_ack = sctp_get_mbuf_for_msg(sizeof(struct sctp_shutdown_ack_chunk), 0, M_DONTWAIT, 1, MT_HEADER);
9031         if (m_shutdown_ack == NULL) {
9032                 /* no mbuf's */
9033                 return;
9034         }
9035         SCTP_BUF_RESV_UF(m_shutdown_ack, SCTP_MIN_OVERHEAD);
9036         sctp_alloc_a_chunk(stcb, chk);
9037         if (chk == NULL) {
9038                 /* no memory */
9039                 sctp_m_freem(m_shutdown_ack);
9040                 return;
9041         }
9042         chk->copy_by_ref = 0;
9043         chk->send_size = sizeof(struct sctp_chunkhdr);
9044         chk->rec.chunk_id.id = SCTP_SHUTDOWN_ACK;
9045         chk->rec.chunk_id.can_take_data = 1;
9046         chk->sent = SCTP_DATAGRAM_UNSENT;
9047         chk->snd_count = 0;
9048         chk->flags = 0;
9049         chk->asoc = &stcb->asoc;
9050         chk->data = m_shutdown_ack;
9051         chk->whoTo = net;
9052         if (chk->whoTo) {
9053                 atomic_add_int(&chk->whoTo->ref_count, 1);
9054         }
9055         ack_cp = mtod(m_shutdown_ack, struct sctp_shutdown_ack_chunk *);
9056         ack_cp->ch.chunk_type = SCTP_SHUTDOWN_ACK;
9057         ack_cp->ch.chunk_flags = 0;
9058         ack_cp->ch.chunk_length = htons(chk->send_size);
9059         SCTP_BUF_LEN(m_shutdown_ack) = chk->send_size;
9060         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9061         chk->asoc->ctrl_queue_cnt++;
9062         return;
9063 }
9064
9065 void
9066 sctp_send_shutdown(struct sctp_tcb *stcb, struct sctp_nets *net)
9067 {
9068         /* formulate and queue a SHUTDOWN to the sender */
9069         struct mbuf *m_shutdown;
9070         struct sctp_shutdown_chunk *shutdown_cp;
9071         struct sctp_tmit_chunk *chk;
9072
9073         m_shutdown = sctp_get_mbuf_for_msg(sizeof(struct sctp_shutdown_chunk), 0, M_DONTWAIT, 1, MT_HEADER);
9074         if (m_shutdown == NULL) {
9075                 /* no mbuf's */
9076                 return;
9077         }
9078         SCTP_BUF_RESV_UF(m_shutdown, SCTP_MIN_OVERHEAD);
9079         sctp_alloc_a_chunk(stcb, chk);
9080         if (chk == NULL) {
9081                 /* no memory */
9082                 sctp_m_freem(m_shutdown);
9083                 return;
9084         }
9085         chk->copy_by_ref = 0;
9086         chk->send_size = sizeof(struct sctp_shutdown_chunk);
9087         chk->rec.chunk_id.id = SCTP_SHUTDOWN;
9088         chk->rec.chunk_id.can_take_data = 1;
9089         chk->sent = SCTP_DATAGRAM_UNSENT;
9090         chk->snd_count = 0;
9091         chk->flags = 0;
9092         chk->asoc = &stcb->asoc;
9093         chk->data = m_shutdown;
9094         chk->whoTo = net;
9095         if (chk->whoTo) {
9096                 atomic_add_int(&chk->whoTo->ref_count, 1);
9097         }
9098         shutdown_cp = mtod(m_shutdown, struct sctp_shutdown_chunk *);
9099         shutdown_cp->ch.chunk_type = SCTP_SHUTDOWN;
9100         shutdown_cp->ch.chunk_flags = 0;
9101         shutdown_cp->ch.chunk_length = htons(chk->send_size);
9102         shutdown_cp->cumulative_tsn_ack = htonl(stcb->asoc.cumulative_tsn);
9103         SCTP_BUF_LEN(m_shutdown) = chk->send_size;
9104         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9105         chk->asoc->ctrl_queue_cnt++;
9106         return;
9107 }
9108
9109 void
9110 sctp_send_asconf(struct sctp_tcb *stcb, struct sctp_nets *net, int addr_locked)
9111 {
9112         /*
9113          * formulate and queue an ASCONF to the peer. ASCONF parameters
9114          * should be queued on the assoc queue.
9115          */
9116         struct sctp_tmit_chunk *chk;
9117         struct mbuf *m_asconf;
9118         int len;
9119
9120         SCTP_TCB_LOCK_ASSERT(stcb);
9121
9122         if ((!TAILQ_EMPTY(&stcb->asoc.asconf_send_queue)) &&
9123             (!sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_MULTIPLE_ASCONFS))) {
9124                 /* can't send a new one if there is one in flight already */
9125                 return;
9126         }
9127         /* compose an ASCONF chunk, maximum length is PMTU */
9128         m_asconf = sctp_compose_asconf(stcb, &len, addr_locked);
9129         if (m_asconf == NULL) {
9130                 return;
9131         }
9132         sctp_alloc_a_chunk(stcb, chk);
9133         if (chk == NULL) {
9134                 /* no memory */
9135                 sctp_m_freem(m_asconf);
9136                 return;
9137         }
9138         chk->copy_by_ref = 0;
9139         chk->data = m_asconf;
9140         chk->send_size = len;
9141         chk->rec.chunk_id.id = SCTP_ASCONF;
9142         chk->rec.chunk_id.can_take_data = 0;
9143         chk->sent = SCTP_DATAGRAM_UNSENT;
9144         chk->snd_count = 0;
9145         chk->flags = CHUNK_FLAGS_FRAGMENT_OK;
9146         chk->asoc = &stcb->asoc;
9147         chk->whoTo = net;
9148         if (chk->whoTo) {
9149                 atomic_add_int(&chk->whoTo->ref_count, 1);
9150         }
9151         TAILQ_INSERT_TAIL(&chk->asoc->asconf_send_queue, chk, sctp_next);
9152         chk->asoc->ctrl_queue_cnt++;
9153         return;
9154 }
9155
9156 void
9157 sctp_send_asconf_ack(struct sctp_tcb *stcb)
9158 {
9159         /*
9160          * formulate and queue a asconf-ack back to sender. the asconf-ack
9161          * must be stored in the tcb.
9162          */
9163         struct sctp_tmit_chunk *chk;
9164         struct sctp_asconf_ack *ack, *latest_ack;
9165         struct mbuf *m_ack;
9166         struct sctp_nets *net = NULL;
9167
9168         SCTP_TCB_LOCK_ASSERT(stcb);
9169         /* Get the latest ASCONF-ACK */
9170         latest_ack = TAILQ_LAST(&stcb->asoc.asconf_ack_sent, sctp_asconf_ackhead);
9171         if (latest_ack == NULL) {
9172                 return;
9173         }
9174         if (latest_ack->last_sent_to != NULL &&
9175             latest_ack->last_sent_to == stcb->asoc.last_control_chunk_from) {
9176                 /* we're doing a retransmission */
9177                 net = sctp_find_alternate_net(stcb, stcb->asoc.last_control_chunk_from, 0);
9178                 if (net == NULL) {
9179                         /* no alternate */
9180                         if (stcb->asoc.last_control_chunk_from == NULL) {
9181                                 if (stcb->asoc.alternate) {
9182                                         net = stcb->asoc.alternate;
9183                                 } else {
9184                                         net = stcb->asoc.primary_destination;
9185                                 }
9186                         } else {
9187                                 net = stcb->asoc.last_control_chunk_from;
9188                         }
9189                 }
9190         } else {
9191                 /* normal case */
9192                 if (stcb->asoc.last_control_chunk_from == NULL) {
9193                         if (stcb->asoc.alternate) {
9194                                 net = stcb->asoc.alternate;
9195                         } else {
9196                                 net = stcb->asoc.primary_destination;
9197                         }
9198                 } else {
9199                         net = stcb->asoc.last_control_chunk_from;
9200                 }
9201         }
9202         latest_ack->last_sent_to = net;
9203
9204         TAILQ_FOREACH(ack, &stcb->asoc.asconf_ack_sent, next) {
9205                 if (ack->data == NULL) {
9206                         continue;
9207                 }
9208                 /* copy the asconf_ack */
9209                 m_ack = SCTP_M_COPYM(ack->data, 0, M_COPYALL, M_DONTWAIT);
9210                 if (m_ack == NULL) {
9211                         /* couldn't copy it */
9212                         return;
9213                 }
9214 #ifdef SCTP_MBUF_LOGGING
9215                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
9216                         struct mbuf *mat;
9217
9218                         for (mat = m_ack; mat; mat = SCTP_BUF_NEXT(mat)) {
9219                                 if (SCTP_BUF_IS_EXTENDED(mat)) {
9220                                         sctp_log_mb(mat, SCTP_MBUF_ICOPY);
9221                                 }
9222                         }
9223                 }
9224 #endif
9225
9226                 sctp_alloc_a_chunk(stcb, chk);
9227                 if (chk == NULL) {
9228                         /* no memory */
9229                         if (m_ack)
9230                                 sctp_m_freem(m_ack);
9231                         return;
9232                 }
9233                 chk->copy_by_ref = 0;
9234
9235                 chk->whoTo = net;
9236                 if (chk->whoTo) {
9237                         atomic_add_int(&chk->whoTo->ref_count, 1);
9238                 }
9239                 chk->data = m_ack;
9240                 chk->send_size = 0;
9241                 /* Get size */
9242                 chk->send_size = ack->len;
9243                 chk->rec.chunk_id.id = SCTP_ASCONF_ACK;
9244                 chk->rec.chunk_id.can_take_data = 1;
9245                 chk->sent = SCTP_DATAGRAM_UNSENT;
9246                 chk->snd_count = 0;
9247                 chk->flags |= CHUNK_FLAGS_FRAGMENT_OK;  /* XXX */
9248                 chk->asoc = &stcb->asoc;
9249
9250                 TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9251                 chk->asoc->ctrl_queue_cnt++;
9252         }
9253         return;
9254 }
9255
9256
9257 static int
9258 sctp_chunk_retransmission(struct sctp_inpcb *inp,
9259     struct sctp_tcb *stcb,
9260     struct sctp_association *asoc,
9261     int *cnt_out, struct timeval *now, int *now_filled, int *fr_done, int so_locked
9262 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
9263     SCTP_UNUSED
9264 #endif
9265 )
9266 {
9267         /*-
9268          * send out one MTU of retransmission. If fast_retransmit is
9269          * happening we ignore the cwnd. Otherwise we obey the cwnd and
9270          * rwnd. For a Cookie or Asconf in the control chunk queue we
9271          * retransmit them by themselves.
9272          *
9273          * For data chunks we will pick out the lowest TSN's in the sent_queue
9274          * marked for resend and bundle them all together (up to a MTU of
9275          * destination). The address to send to should have been
9276          * selected/changed where the retransmission was marked (i.e. in FR
9277          * or t3-timeout routines).
9278          */
9279         struct sctp_tmit_chunk *data_list[SCTP_MAX_DATA_BUNDLING];
9280         struct sctp_tmit_chunk *chk, *fwd;
9281         struct mbuf *m, *endofchain;
9282         struct sctp_nets *net = NULL;
9283         uint32_t tsns_sent = 0;
9284         int no_fragmentflg, bundle_at, cnt_thru;
9285         unsigned int mtu;
9286         int error, i, one_chunk, fwd_tsn, ctl_cnt, tmr_started;
9287         struct sctp_auth_chunk *auth = NULL;
9288         uint32_t auth_offset = 0;
9289         uint16_t auth_keyid;
9290         int override_ok = 1;
9291         int data_auth_reqd = 0;
9292         uint32_t dmtu = 0;
9293
9294         SCTP_TCB_LOCK_ASSERT(stcb);
9295         tmr_started = ctl_cnt = bundle_at = error = 0;
9296         no_fragmentflg = 1;
9297         fwd_tsn = 0;
9298         *cnt_out = 0;
9299         fwd = NULL;
9300         endofchain = m = NULL;
9301         auth_keyid = stcb->asoc.authinfo.active_keyid;
9302 #ifdef SCTP_AUDITING_ENABLED
9303         sctp_audit_log(0xC3, 1);
9304 #endif
9305         if ((TAILQ_EMPTY(&asoc->sent_queue)) &&
9306             (TAILQ_EMPTY(&asoc->control_send_queue))) {
9307                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "SCTP hits empty queue with cnt set to %d?\n",
9308                     asoc->sent_queue_retran_cnt);
9309                 asoc->sent_queue_cnt = 0;
9310                 asoc->sent_queue_cnt_removeable = 0;
9311                 /* send back 0/0 so we enter normal transmission */
9312                 *cnt_out = 0;
9313                 return (0);
9314         }
9315         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
9316                 if ((chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) ||
9317                     (chk->rec.chunk_id.id == SCTP_STREAM_RESET) ||
9318                     (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN)) {
9319                         if (chk->sent != SCTP_DATAGRAM_RESEND) {
9320                                 continue;
9321                         }
9322                         if (chk->rec.chunk_id.id == SCTP_STREAM_RESET) {
9323                                 if (chk != asoc->str_reset) {
9324                                         /*
9325                                          * not eligible for retran if its
9326                                          * not ours
9327                                          */
9328                                         continue;
9329                                 }
9330                         }
9331                         ctl_cnt++;
9332                         if (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN) {
9333                                 fwd_tsn = 1;
9334                         }
9335                         /*
9336                          * Add an AUTH chunk, if chunk requires it save the
9337                          * offset into the chain for AUTH
9338                          */
9339                         if ((auth == NULL) &&
9340                             (sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
9341                             stcb->asoc.peer_auth_chunks))) {
9342                                 m = sctp_add_auth_chunk(m, &endofchain,
9343                                     &auth, &auth_offset,
9344                                     stcb,
9345                                     chk->rec.chunk_id.id);
9346                                 SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
9347                         }
9348                         m = sctp_copy_mbufchain(chk->data, m, &endofchain, 0, chk->send_size, chk->copy_by_ref);
9349                         break;
9350                 }
9351         }
9352         one_chunk = 0;
9353         cnt_thru = 0;
9354         /* do we have control chunks to retransmit? */
9355         if (m != NULL) {
9356                 /* Start a timer no matter if we suceed or fail */
9357                 if (chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
9358                         sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, inp, stcb, chk->whoTo);
9359                 } else if (chk->rec.chunk_id.id == SCTP_ASCONF)
9360                         sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp, stcb, chk->whoTo);
9361                 chk->snd_count++;       /* update our count */
9362                 if ((error = sctp_lowlevel_chunk_output(inp, stcb, chk->whoTo,
9363                     (struct sockaddr *)&chk->whoTo->ro._l_addr, m,
9364                     auth_offset, auth, stcb->asoc.authinfo.active_keyid,
9365                     no_fragmentflg, 0, 0,
9366                     inp->sctp_lport, stcb->rport, htonl(stcb->asoc.peer_vtag),
9367                     chk->whoTo->port, NULL,
9368                     0, 0,
9369                     so_locked))) {
9370                         SCTP_STAT_INCR(sctps_lowlevelerr);
9371                         return (error);
9372                 }
9373                 endofchain = NULL;
9374                 auth = NULL;
9375                 auth_offset = 0;
9376                 /*
9377                  * We don't want to mark the net->sent time here since this
9378                  * we use this for HB and retrans cannot measure RTT
9379                  */
9380                 /* (void)SCTP_GETTIME_TIMEVAL(&chk->whoTo->last_sent_time); */
9381                 *cnt_out += 1;
9382                 chk->sent = SCTP_DATAGRAM_SENT;
9383                 sctp_ucount_decr(stcb->asoc.sent_queue_retran_cnt);
9384                 if (fwd_tsn == 0) {
9385                         return (0);
9386                 } else {
9387                         /* Clean up the fwd-tsn list */
9388                         sctp_clean_up_ctl(stcb, asoc, so_locked);
9389                         return (0);
9390                 }
9391         }
9392         /*
9393          * Ok, it is just data retransmission we need to do or that and a
9394          * fwd-tsn with it all.
9395          */
9396         if (TAILQ_EMPTY(&asoc->sent_queue)) {
9397                 return (SCTP_RETRAN_DONE);
9398         }
9399         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED) ||
9400             (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT)) {
9401                 /* not yet open, resend the cookie and that is it */
9402                 return (1);
9403         }
9404 #ifdef SCTP_AUDITING_ENABLED
9405         sctp_auditing(20, inp, stcb, NULL);
9406 #endif
9407         data_auth_reqd = sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks);
9408         TAILQ_FOREACH(chk, &asoc->sent_queue, sctp_next) {
9409                 if (chk->sent != SCTP_DATAGRAM_RESEND) {
9410                         /* No, not sent to this net or not ready for rtx */
9411                         continue;
9412                 }
9413                 if (chk->data == NULL) {
9414                         SCTP_PRINTF("TSN:%x chk->snd_count:%d chk->sent:%d can't retran - no data\n",
9415                             chk->rec.data.TSN_seq, chk->snd_count, chk->sent);
9416                         continue;
9417                 }
9418                 if ((SCTP_BASE_SYSCTL(sctp_max_retran_chunk)) &&
9419                     (chk->snd_count >= SCTP_BASE_SYSCTL(sctp_max_retran_chunk))) {
9420                         /* Gak, we have exceeded max unlucky retran, abort! */
9421                         SCTP_PRINTF("Gak, chk->snd_count:%d >= max:%d - send abort\n",
9422                             chk->snd_count,
9423                             SCTP_BASE_SYSCTL(sctp_max_retran_chunk));
9424                         atomic_add_int(&stcb->asoc.refcnt, 1);
9425                         sctp_abort_an_association(stcb->sctp_ep, stcb, NULL, so_locked);
9426                         SCTP_TCB_LOCK(stcb);
9427                         atomic_subtract_int(&stcb->asoc.refcnt, 1);
9428                         return (SCTP_RETRAN_EXIT);
9429                 }
9430                 /* pick up the net */
9431                 net = chk->whoTo;
9432                 switch (net->ro._l_addr.sa.sa_family) {
9433 #ifdef INET
9434                 case AF_INET:
9435                         mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
9436                         break;
9437 #endif
9438 #ifdef INET6
9439                 case AF_INET6:
9440                         mtu = net->mtu - SCTP_MIN_OVERHEAD;
9441                         break;
9442 #endif
9443                 default:
9444                         /* TSNH */
9445                         mtu = net->mtu;
9446                         break;
9447                 }
9448
9449                 if ((asoc->peers_rwnd < mtu) && (asoc->total_flight > 0)) {
9450                         /* No room in peers rwnd */
9451                         uint32_t tsn;
9452
9453                         tsn = asoc->last_acked_seq + 1;
9454                         if (tsn == chk->rec.data.TSN_seq) {
9455                                 /*
9456                                  * we make a special exception for this
9457                                  * case. The peer has no rwnd but is missing
9458                                  * the lowest chunk.. which is probably what
9459                                  * is holding up the rwnd.
9460                                  */
9461                                 goto one_chunk_around;
9462                         }
9463                         return (1);
9464                 }
9465 one_chunk_around:
9466                 if (asoc->peers_rwnd < mtu) {
9467                         one_chunk = 1;
9468                         if ((asoc->peers_rwnd == 0) &&
9469                             (asoc->total_flight == 0)) {
9470                                 chk->window_probe = 1;
9471                                 chk->whoTo->window_probe = 1;
9472                         }
9473                 }
9474 #ifdef SCTP_AUDITING_ENABLED
9475                 sctp_audit_log(0xC3, 2);
9476 #endif
9477                 bundle_at = 0;
9478                 m = NULL;
9479                 net->fast_retran_ip = 0;
9480                 if (chk->rec.data.doing_fast_retransmit == 0) {
9481                         /*
9482                          * if no FR in progress skip destination that have
9483                          * flight_size > cwnd.
9484                          */
9485                         if (net->flight_size >= net->cwnd) {
9486                                 continue;
9487                         }
9488                 } else {
9489                         /*
9490                          * Mark the destination net to have FR recovery
9491                          * limits put on it.
9492                          */
9493                         *fr_done = 1;
9494                         net->fast_retran_ip = 1;
9495                 }
9496
9497                 /*
9498                  * if no AUTH is yet included and this chunk requires it,
9499                  * make sure to account for it.  We don't apply the size
9500                  * until the AUTH chunk is actually added below in case
9501                  * there is no room for this chunk.
9502                  */
9503                 if (data_auth_reqd && (auth == NULL)) {
9504                         dmtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
9505                 } else
9506                         dmtu = 0;
9507
9508                 if ((chk->send_size <= (mtu - dmtu)) ||
9509                     (chk->flags & CHUNK_FLAGS_FRAGMENT_OK)) {
9510                         /* ok we will add this one */
9511                         if (data_auth_reqd) {
9512                                 if (auth == NULL) {
9513                                         m = sctp_add_auth_chunk(m,
9514                                             &endofchain,
9515                                             &auth,
9516                                             &auth_offset,
9517                                             stcb,
9518                                             SCTP_DATA);
9519                                         auth_keyid = chk->auth_keyid;
9520                                         override_ok = 0;
9521                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
9522                                 } else if (override_ok) {
9523                                         auth_keyid = chk->auth_keyid;
9524                                         override_ok = 0;
9525                                 } else if (chk->auth_keyid != auth_keyid) {
9526                                         /* different keyid, so done bundling */
9527                                         break;
9528                                 }
9529                         }
9530                         m = sctp_copy_mbufchain(chk->data, m, &endofchain, 0, chk->send_size, chk->copy_by_ref);
9531                         if (m == NULL) {
9532                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
9533                                 return (ENOMEM);
9534                         }
9535                         /* Do clear IP_DF ? */
9536                         if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
9537                                 no_fragmentflg = 0;
9538                         }
9539                         /* upate our MTU size */
9540                         if (mtu > (chk->send_size + dmtu))
9541                                 mtu -= (chk->send_size + dmtu);
9542                         else
9543                                 mtu = 0;
9544                         data_list[bundle_at++] = chk;
9545                         if (one_chunk && (asoc->total_flight <= 0)) {
9546                                 SCTP_STAT_INCR(sctps_windowprobed);
9547                         }
9548                 }
9549                 if (one_chunk == 0) {
9550                         /*
9551                          * now are there anymore forward from chk to pick
9552                          * up?
9553                          */
9554                         for (fwd = TAILQ_NEXT(chk, sctp_next); fwd != NULL; fwd = TAILQ_NEXT(fwd, sctp_next)) {
9555                                 if (fwd->sent != SCTP_DATAGRAM_RESEND) {
9556                                         /* Nope, not for retran */
9557                                         continue;
9558                                 }
9559                                 if (fwd->whoTo != net) {
9560                                         /* Nope, not the net in question */
9561                                         continue;
9562                                 }
9563                                 if (data_auth_reqd && (auth == NULL)) {
9564                                         dmtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
9565                                 } else
9566                                         dmtu = 0;
9567                                 if (fwd->send_size <= (mtu - dmtu)) {
9568                                         if (data_auth_reqd) {
9569                                                 if (auth == NULL) {
9570                                                         m = sctp_add_auth_chunk(m,
9571                                                             &endofchain,
9572                                                             &auth,
9573                                                             &auth_offset,
9574                                                             stcb,
9575                                                             SCTP_DATA);
9576                                                         auth_keyid = fwd->auth_keyid;
9577                                                         override_ok = 0;
9578                                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
9579                                                 } else if (override_ok) {
9580                                                         auth_keyid = fwd->auth_keyid;
9581                                                         override_ok = 0;
9582                                                 } else if (fwd->auth_keyid != auth_keyid) {
9583                                                         /*
9584                                                          * different keyid,
9585                                                          * so done bundling
9586                                                          */
9587                                                         break;
9588                                                 }
9589                                         }
9590                                         m = sctp_copy_mbufchain(fwd->data, m, &endofchain, 0, fwd->send_size, fwd->copy_by_ref);
9591                                         if (m == NULL) {
9592                                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
9593                                                 return (ENOMEM);
9594                                         }
9595                                         /* Do clear IP_DF ? */
9596                                         if (fwd->flags & CHUNK_FLAGS_FRAGMENT_OK) {
9597                                                 no_fragmentflg = 0;
9598                                         }
9599                                         /* upate our MTU size */
9600                                         if (mtu > (fwd->send_size + dmtu))
9601                                                 mtu -= (fwd->send_size + dmtu);
9602                                         else
9603                                                 mtu = 0;
9604                                         data_list[bundle_at++] = fwd;
9605                                         if (bundle_at >= SCTP_MAX_DATA_BUNDLING) {
9606                                                 break;
9607                                         }
9608                                 } else {
9609                                         /* can't fit so we are done */
9610                                         break;
9611                                 }
9612                         }
9613                 }
9614                 /* Is there something to send for this destination? */
9615                 if (m) {
9616                         /*
9617                          * No matter if we fail/or suceed we should start a
9618                          * timer. A failure is like a lost IP packet :-)
9619                          */
9620                         if (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
9621                                 /*
9622                                  * no timer running on this destination
9623                                  * restart it.
9624                                  */
9625                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
9626                                 tmr_started = 1;
9627                         }
9628                         /* Now lets send it, if there is anything to send :> */
9629                         if ((error = sctp_lowlevel_chunk_output(inp, stcb, net,
9630                             (struct sockaddr *)&net->ro._l_addr, m,
9631                             auth_offset, auth, auth_keyid,
9632                             no_fragmentflg, 0, 0,
9633                             inp->sctp_lport, stcb->rport, htonl(stcb->asoc.peer_vtag),
9634                             net->port, NULL,
9635                             0, 0,
9636                             so_locked))) {
9637                                 /* error, we could not output */
9638                                 SCTP_STAT_INCR(sctps_lowlevelerr);
9639                                 return (error);
9640                         }
9641                         endofchain = NULL;
9642                         auth = NULL;
9643                         auth_offset = 0;
9644                         /* For HB's */
9645                         /*
9646                          * We don't want to mark the net->sent time here
9647                          * since this we use this for HB and retrans cannot
9648                          * measure RTT
9649                          */
9650                         /* (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time); */
9651
9652                         /* For auto-close */
9653                         cnt_thru++;
9654                         if (*now_filled == 0) {
9655                                 (void)SCTP_GETTIME_TIMEVAL(&asoc->time_last_sent);
9656                                 *now = asoc->time_last_sent;
9657                                 *now_filled = 1;
9658                         } else {
9659                                 asoc->time_last_sent = *now;
9660                         }
9661                         *cnt_out += bundle_at;
9662 #ifdef SCTP_AUDITING_ENABLED
9663                         sctp_audit_log(0xC4, bundle_at);
9664 #endif
9665                         if (bundle_at) {
9666                                 tsns_sent = data_list[0]->rec.data.TSN_seq;
9667                         }
9668                         for (i = 0; i < bundle_at; i++) {
9669                                 SCTP_STAT_INCR(sctps_sendretransdata);
9670                                 data_list[i]->sent = SCTP_DATAGRAM_SENT;
9671                                 /*
9672                                  * When we have a revoked data, and we
9673                                  * retransmit it, then we clear the revoked
9674                                  * flag since this flag dictates if we
9675                                  * subtracted from the fs
9676                                  */
9677                                 if (data_list[i]->rec.data.chunk_was_revoked) {
9678                                         /* Deflate the cwnd */
9679                                         data_list[i]->whoTo->cwnd -= data_list[i]->book_size;
9680                                         data_list[i]->rec.data.chunk_was_revoked = 0;
9681                                 }
9682                                 data_list[i]->snd_count++;
9683                                 sctp_ucount_decr(asoc->sent_queue_retran_cnt);
9684                                 /* record the time */
9685                                 data_list[i]->sent_rcv_time = asoc->time_last_sent;
9686                                 if (data_list[i]->book_size_scale) {
9687                                         /*
9688                                          * need to double the book size on
9689                                          * this one
9690                                          */
9691                                         data_list[i]->book_size_scale = 0;
9692                                         /*
9693                                          * Since we double the booksize, we
9694                                          * must also double the output queue
9695                                          * size, since this get shrunk when
9696                                          * we free by this amount.
9697                                          */
9698                                         atomic_add_int(&((asoc)->total_output_queue_size), data_list[i]->book_size);
9699                                         data_list[i]->book_size *= 2;
9700
9701
9702                                 } else {
9703                                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_RWND_ENABLE) {
9704                                                 sctp_log_rwnd(SCTP_DECREASE_PEER_RWND,
9705                                                     asoc->peers_rwnd, data_list[i]->send_size, SCTP_BASE_SYSCTL(sctp_peer_chunk_oh));
9706                                         }
9707                                         asoc->peers_rwnd = sctp_sbspace_sub(asoc->peers_rwnd,
9708                                             (uint32_t) (data_list[i]->send_size +
9709                                             SCTP_BASE_SYSCTL(sctp_peer_chunk_oh)));
9710                                 }
9711                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
9712                                         sctp_misc_ints(SCTP_FLIGHT_LOG_UP_RSND,
9713                                             data_list[i]->whoTo->flight_size,
9714                                             data_list[i]->book_size,
9715                                             (uintptr_t) data_list[i]->whoTo,
9716                                             data_list[i]->rec.data.TSN_seq);
9717                                 }
9718                                 sctp_flight_size_increase(data_list[i]);
9719                                 sctp_total_flight_increase(stcb, data_list[i]);
9720                                 if (asoc->peers_rwnd < stcb->sctp_ep->sctp_ep.sctp_sws_sender) {
9721                                         /* SWS sender side engages */
9722                                         asoc->peers_rwnd = 0;
9723                                 }
9724                                 if ((i == 0) &&
9725                                     (data_list[i]->rec.data.doing_fast_retransmit)) {
9726                                         SCTP_STAT_INCR(sctps_sendfastretrans);
9727                                         if ((data_list[i] == TAILQ_FIRST(&asoc->sent_queue)) &&
9728                                             (tmr_started == 0)) {
9729                                                 /*-
9730                                                  * ok we just fast-retrans'd
9731                                                  * the lowest TSN, i.e the
9732                                                  * first on the list. In
9733                                                  * this case we want to give
9734                                                  * some more time to get a
9735                                                  * SACK back without a
9736                                                  * t3-expiring.
9737                                                  */
9738                                                 sctp_timer_stop(SCTP_TIMER_TYPE_SEND, inp, stcb, net,
9739                                                     SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_4);
9740                                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
9741                                         }
9742                                 }
9743                         }
9744                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
9745                                 sctp_log_cwnd(stcb, net, tsns_sent, SCTP_CWND_LOG_FROM_RESEND);
9746                         }
9747 #ifdef SCTP_AUDITING_ENABLED
9748                         sctp_auditing(21, inp, stcb, NULL);
9749 #endif
9750                 } else {
9751                         /* None will fit */
9752                         return (1);
9753                 }
9754                 if (asoc->sent_queue_retran_cnt <= 0) {
9755                         /* all done we have no more to retran */
9756                         asoc->sent_queue_retran_cnt = 0;
9757                         break;
9758                 }
9759                 if (one_chunk) {
9760                         /* No more room in rwnd */
9761                         return (1);
9762                 }
9763                 /* stop the for loop here. we sent out a packet */
9764                 break;
9765         }
9766         return (0);
9767 }
9768
9769 static void
9770 sctp_timer_validation(struct sctp_inpcb *inp,
9771     struct sctp_tcb *stcb,
9772     struct sctp_association *asoc)
9773 {
9774         struct sctp_nets *net;
9775
9776         /* Validate that a timer is running somewhere */
9777         TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
9778                 if (SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
9779                         /* Here is a timer */
9780                         return;
9781                 }
9782         }
9783         SCTP_TCB_LOCK_ASSERT(stcb);
9784         /* Gak, we did not have a timer somewhere */
9785         SCTPDBG(SCTP_DEBUG_OUTPUT3, "Deadlock avoided starting timer on a dest at retran\n");
9786         if (asoc->alternate) {
9787                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, asoc->alternate);
9788         } else {
9789                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, asoc->primary_destination);
9790         }
9791         return;
9792 }
9793
9794 void
9795 sctp_chunk_output(struct sctp_inpcb *inp,
9796     struct sctp_tcb *stcb,
9797     int from_where,
9798     int so_locked
9799 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
9800     SCTP_UNUSED
9801 #endif
9802 )
9803 {
9804         /*-
9805          * Ok this is the generic chunk service queue. we must do the
9806          * following:
9807          * - See if there are retransmits pending, if so we must
9808          *   do these first.
9809          * - Service the stream queue that is next, moving any
9810          *   message (note I must get a complete message i.e.
9811          *   FIRST/MIDDLE and LAST to the out queue in one pass) and assigning
9812          *   TSN's
9813          * - Check to see if the cwnd/rwnd allows any output, if so we
9814          *   go ahead and fomulate and send the low level chunks. Making sure
9815          *   to combine any control in the control chunk queue also.
9816          */
9817         struct sctp_association *asoc;
9818         struct sctp_nets *net;
9819         int error = 0, num_out = 0, tot_out = 0, ret = 0, reason_code = 0;
9820         unsigned int burst_cnt = 0;
9821         struct timeval now;
9822         int now_filled = 0;
9823         int nagle_on;
9824         int frag_point = sctp_get_frag_point(stcb, &stcb->asoc);
9825         int un_sent = 0;
9826         int fr_done;
9827         unsigned int tot_frs = 0;
9828
9829         asoc = &stcb->asoc;
9830         /* The Nagle algorithm is only applied when handling a send call. */
9831         if (from_where == SCTP_OUTPUT_FROM_USR_SEND) {
9832                 if (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_NODELAY)) {
9833                         nagle_on = 0;
9834                 } else {
9835                         nagle_on = 1;
9836                 }
9837         } else {
9838                 nagle_on = 0;
9839         }
9840         SCTP_TCB_LOCK_ASSERT(stcb);
9841
9842         un_sent = (stcb->asoc.total_output_queue_size - stcb->asoc.total_flight);
9843
9844         if ((un_sent <= 0) &&
9845             (TAILQ_EMPTY(&asoc->control_send_queue)) &&
9846             (TAILQ_EMPTY(&asoc->asconf_send_queue)) &&
9847             (asoc->sent_queue_retran_cnt == 0)) {
9848                 /* Nothing to do unless there is something to be sent left */
9849                 return;
9850         }
9851         /*
9852          * Do we have something to send, data or control AND a sack timer
9853          * running, if so piggy-back the sack.
9854          */
9855         if (SCTP_OS_TIMER_PENDING(&stcb->asoc.dack_timer.timer)) {
9856                 sctp_send_sack(stcb, so_locked);
9857                 (void)SCTP_OS_TIMER_STOP(&stcb->asoc.dack_timer.timer);
9858         }
9859         while (asoc->sent_queue_retran_cnt) {
9860                 /*-
9861                  * Ok, it is retransmission time only, we send out only ONE
9862                  * packet with a single call off to the retran code.
9863                  */
9864                 if (from_where == SCTP_OUTPUT_FROM_COOKIE_ACK) {
9865                         /*-
9866                          * Special hook for handling cookiess discarded
9867                          * by peer that carried data. Send cookie-ack only
9868                          * and then the next call with get the retran's.
9869                          */
9870                         (void)sctp_med_chunk_output(inp, stcb, asoc, &num_out, &reason_code, 1,
9871                             from_where,
9872                             &now, &now_filled, frag_point, so_locked);
9873                         return;
9874                 } else if (from_where != SCTP_OUTPUT_FROM_HB_TMR) {
9875                         /* if its not from a HB then do it */
9876                         fr_done = 0;
9877                         ret = sctp_chunk_retransmission(inp, stcb, asoc, &num_out, &now, &now_filled, &fr_done, so_locked);
9878                         if (fr_done) {
9879                                 tot_frs++;
9880                         }
9881                 } else {
9882                         /*
9883                          * its from any other place, we don't allow retran
9884                          * output (only control)
9885                          */
9886                         ret = 1;
9887                 }
9888                 if (ret > 0) {
9889                         /* Can't send anymore */
9890                         /*-
9891                          * now lets push out control by calling med-level
9892                          * output once. this assures that we WILL send HB's
9893                          * if queued too.
9894                          */
9895                         (void)sctp_med_chunk_output(inp, stcb, asoc, &num_out, &reason_code, 1,
9896                             from_where,
9897                             &now, &now_filled, frag_point, so_locked);
9898 #ifdef SCTP_AUDITING_ENABLED
9899                         sctp_auditing(8, inp, stcb, NULL);
9900 #endif
9901                         sctp_timer_validation(inp, stcb, asoc);
9902                         return;
9903                 }
9904                 if (ret < 0) {
9905                         /*-
9906                          * The count was off.. retran is not happening so do
9907                          * the normal retransmission.
9908                          */
9909 #ifdef SCTP_AUDITING_ENABLED
9910                         sctp_auditing(9, inp, stcb, NULL);
9911 #endif
9912                         if (ret == SCTP_RETRAN_EXIT) {
9913                                 return;
9914                         }
9915                         break;
9916                 }
9917                 if (from_where == SCTP_OUTPUT_FROM_T3) {
9918                         /* Only one transmission allowed out of a timeout */
9919 #ifdef SCTP_AUDITING_ENABLED
9920                         sctp_auditing(10, inp, stcb, NULL);
9921 #endif
9922                         /* Push out any control */
9923                         (void)sctp_med_chunk_output(inp, stcb, asoc, &num_out, &reason_code, 1, from_where,
9924                             &now, &now_filled, frag_point, so_locked);
9925                         return;
9926                 }
9927                 if ((asoc->fr_max_burst > 0) && (tot_frs >= asoc->fr_max_burst)) {
9928                         /* Hit FR burst limit */
9929                         return;
9930                 }
9931                 if ((num_out == 0) && (ret == 0)) {
9932                         /* No more retrans to send */
9933                         break;
9934                 }
9935         }
9936 #ifdef SCTP_AUDITING_ENABLED
9937         sctp_auditing(12, inp, stcb, NULL);
9938 #endif
9939         /* Check for bad destinations, if they exist move chunks around. */
9940         TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
9941                 if (!(net->dest_state & SCTP_ADDR_REACHABLE)) {
9942                         /*-
9943                          * if possible move things off of this address we
9944                          * still may send below due to the dormant state but
9945                          * we try to find an alternate address to send to
9946                          * and if we have one we move all queued data on the
9947                          * out wheel to this alternate address.
9948                          */
9949                         if (net->ref_count > 1)
9950                                 sctp_move_chunks_from_net(stcb, net);
9951                 } else {
9952                         /*-
9953                          * if ((asoc->sat_network) || (net->addr_is_local))
9954                          * { burst_limit = asoc->max_burst *
9955                          * SCTP_SAT_NETWORK_BURST_INCR; }
9956                          */
9957                         if (asoc->max_burst > 0) {
9958                                 if (SCTP_BASE_SYSCTL(sctp_use_cwnd_based_maxburst)) {
9959                                         if ((net->flight_size + (asoc->max_burst * net->mtu)) < net->cwnd) {
9960                                                 /*
9961                                                  * JRS - Use the congestion
9962                                                  * control given in the
9963                                                  * congestion control module
9964                                                  */
9965                                                 asoc->cc_functions.sctp_cwnd_update_after_output(stcb, net, asoc->max_burst);
9966                                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_MAXBURST_ENABLE) {
9967                                                         sctp_log_maxburst(stcb, net, 0, asoc->max_burst, SCTP_MAX_BURST_APPLIED);
9968                                                 }
9969                                                 SCTP_STAT_INCR(sctps_maxburstqueued);
9970                                         }
9971                                         net->fast_retran_ip = 0;
9972                                 } else {
9973                                         if (net->flight_size == 0) {
9974                                                 /*
9975                                                  * Should be decaying the
9976                                                  * cwnd here
9977                                                  */
9978                                                 ;
9979                                         }
9980                                 }
9981                         }
9982                 }
9983
9984         }
9985         burst_cnt = 0;
9986         do {
9987                 error = sctp_med_chunk_output(inp, stcb, asoc, &num_out,
9988                     &reason_code, 0, from_where,
9989                     &now, &now_filled, frag_point, so_locked);
9990                 if (error) {
9991                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Error %d was returned from med-c-op\n", error);
9992                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_MAXBURST_ENABLE) {
9993                                 sctp_log_maxburst(stcb, asoc->primary_destination, error, burst_cnt, SCTP_MAX_BURST_ERROR_STOP);
9994                         }
9995                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
9996                                 sctp_log_cwnd(stcb, NULL, error, SCTP_SEND_NOW_COMPLETES);
9997                                 sctp_log_cwnd(stcb, NULL, 0xdeadbeef, SCTP_SEND_NOW_COMPLETES);
9998                         }
9999                         break;
10000                 }
10001                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "m-c-o put out %d\n", num_out);
10002
10003                 tot_out += num_out;
10004                 burst_cnt++;
10005                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
10006                         sctp_log_cwnd(stcb, NULL, num_out, SCTP_SEND_NOW_COMPLETES);
10007                         if (num_out == 0) {
10008                                 sctp_log_cwnd(stcb, NULL, reason_code, SCTP_SEND_NOW_COMPLETES);
10009                         }
10010                 }
10011                 if (nagle_on) {
10012                         /*
10013                          * When the Nagle algorithm is used, look at how
10014                          * much is unsent, then if its smaller than an MTU
10015                          * and we have data in flight we stop, except if we
10016                          * are handling a fragmented user message.
10017                          */
10018                         un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
10019                             (stcb->asoc.stream_queue_cnt * sizeof(struct sctp_data_chunk)));
10020                         if ((un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD)) &&
10021                             (stcb->asoc.total_flight > 0) &&
10022                             ((stcb->asoc.locked_on_sending == NULL) ||
10023                             sctp_is_feature_on(inp, SCTP_PCB_FLAGS_EXPLICIT_EOR))) {
10024                                 break;
10025                         }
10026                 }
10027                 if (TAILQ_EMPTY(&asoc->control_send_queue) &&
10028                     TAILQ_EMPTY(&asoc->send_queue) &&
10029                     stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc)) {
10030                         /* Nothing left to send */
10031                         break;
10032                 }
10033                 if ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) <= 0) {
10034                         /* Nothing left to send */
10035                         break;
10036                 }
10037         } while (num_out &&
10038             ((asoc->max_burst == 0) ||
10039             SCTP_BASE_SYSCTL(sctp_use_cwnd_based_maxburst) ||
10040             (burst_cnt < asoc->max_burst)));
10041
10042         if (SCTP_BASE_SYSCTL(sctp_use_cwnd_based_maxburst) == 0) {
10043                 if ((asoc->max_burst > 0) && (burst_cnt >= asoc->max_burst)) {
10044                         SCTP_STAT_INCR(sctps_maxburstqueued);
10045                         asoc->burst_limit_applied = 1;
10046                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_MAXBURST_ENABLE) {
10047                                 sctp_log_maxburst(stcb, asoc->primary_destination, 0, burst_cnt, SCTP_MAX_BURST_APPLIED);
10048                         }
10049                 } else {
10050                         asoc->burst_limit_applied = 0;
10051                 }
10052         }
10053         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
10054                 sctp_log_cwnd(stcb, NULL, tot_out, SCTP_SEND_NOW_COMPLETES);
10055         }
10056         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Ok, we have put out %d chunks\n",
10057             tot_out);
10058
10059         /*-
10060          * Now we need to clean up the control chunk chain if a ECNE is on
10061          * it. It must be marked as UNSENT again so next call will continue
10062          * to send it until such time that we get a CWR, to remove it.
10063          */
10064         if (stcb->asoc.ecn_echo_cnt_onq)
10065                 sctp_fix_ecn_echo(asoc);
10066         return;
10067 }
10068
10069
10070 int
10071 sctp_output(
10072     struct sctp_inpcb *inp,
10073     struct mbuf *m,
10074     struct sockaddr *addr,
10075     struct mbuf *control,
10076     struct thread *p,
10077     int flags)
10078 {
10079         if (inp == NULL) {
10080                 SCTP_LTRACE_ERR_RET_PKT(m, inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
10081                 return (EINVAL);
10082         }
10083         if (inp->sctp_socket == NULL) {
10084                 SCTP_LTRACE_ERR_RET_PKT(m, inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
10085                 return (EINVAL);
10086         }
10087         return (sctp_sosend(inp->sctp_socket,
10088             addr,
10089             (struct uio *)NULL,
10090             m,
10091             control,
10092             flags, p
10093             ));
10094 }
10095
10096 void
10097 send_forward_tsn(struct sctp_tcb *stcb,
10098     struct sctp_association *asoc)
10099 {
10100         struct sctp_tmit_chunk *chk;
10101         struct sctp_forward_tsn_chunk *fwdtsn;
10102         uint32_t advance_peer_ack_point;
10103
10104         SCTP_TCB_LOCK_ASSERT(stcb);
10105         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
10106                 if (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN) {
10107                         /* mark it to unsent */
10108                         chk->sent = SCTP_DATAGRAM_UNSENT;
10109                         chk->snd_count = 0;
10110                         /* Do we correct its output location? */
10111                         if (chk->whoTo) {
10112                                 sctp_free_remote_addr(chk->whoTo);
10113                                 chk->whoTo = NULL;
10114                         }
10115                         goto sctp_fill_in_rest;
10116                 }
10117         }
10118         /* Ok if we reach here we must build one */
10119         sctp_alloc_a_chunk(stcb, chk);
10120         if (chk == NULL) {
10121                 return;
10122         }
10123         asoc->fwd_tsn_cnt++;
10124         chk->copy_by_ref = 0;
10125         chk->rec.chunk_id.id = SCTP_FORWARD_CUM_TSN;
10126         chk->rec.chunk_id.can_take_data = 0;
10127         chk->asoc = asoc;
10128         chk->whoTo = NULL;
10129         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_DONTWAIT, 1, MT_DATA);
10130         if (chk->data == NULL) {
10131                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
10132                 return;
10133         }
10134         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
10135         chk->sent = SCTP_DATAGRAM_UNSENT;
10136         chk->snd_count = 0;
10137         TAILQ_INSERT_TAIL(&asoc->control_send_queue, chk, sctp_next);
10138         asoc->ctrl_queue_cnt++;
10139 sctp_fill_in_rest:
10140         /*-
10141          * Here we go through and fill out the part that deals with
10142          * stream/seq of the ones we skip.
10143          */
10144         SCTP_BUF_LEN(chk->data) = 0;
10145         {
10146                 struct sctp_tmit_chunk *at, *tp1, *last;
10147                 struct sctp_strseq *strseq;
10148                 unsigned int cnt_of_space, i, ovh;
10149                 unsigned int space_needed;
10150                 unsigned int cnt_of_skipped = 0;
10151
10152                 TAILQ_FOREACH(at, &asoc->sent_queue, sctp_next) {
10153                         if (at->sent != SCTP_FORWARD_TSN_SKIP) {
10154                                 /* no more to look at */
10155                                 break;
10156                         }
10157                         if (at->rec.data.rcv_flags & SCTP_DATA_UNORDERED) {
10158                                 /* We don't report these */
10159                                 continue;
10160                         }
10161                         cnt_of_skipped++;
10162                 }
10163                 space_needed = (sizeof(struct sctp_forward_tsn_chunk) +
10164                     (cnt_of_skipped * sizeof(struct sctp_strseq)));
10165
10166                 cnt_of_space = M_TRAILINGSPACE(chk->data);
10167
10168                 if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
10169                         ovh = SCTP_MIN_OVERHEAD;
10170                 } else {
10171                         ovh = SCTP_MIN_V4_OVERHEAD;
10172                 }
10173                 if (cnt_of_space > (asoc->smallest_mtu - ovh)) {
10174                         /* trim to a mtu size */
10175                         cnt_of_space = asoc->smallest_mtu - ovh;
10176                 }
10177                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_TRY_ADVANCE) {
10178                         sctp_misc_ints(SCTP_FWD_TSN_CHECK,
10179                             0xff, 0, cnt_of_skipped,
10180                             asoc->advanced_peer_ack_point);
10181
10182                 }
10183                 advance_peer_ack_point = asoc->advanced_peer_ack_point;
10184                 if (cnt_of_space < space_needed) {
10185                         /*-
10186                          * ok we must trim down the chunk by lowering the
10187                          * advance peer ack point.
10188                          */
10189                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_TRY_ADVANCE) {
10190                                 sctp_misc_ints(SCTP_FWD_TSN_CHECK,
10191                                     0xff, 0xff, cnt_of_space,
10192                                     space_needed);
10193                         }
10194                         cnt_of_skipped = cnt_of_space - sizeof(struct sctp_forward_tsn_chunk);
10195                         cnt_of_skipped /= sizeof(struct sctp_strseq);
10196                         /*-
10197                          * Go through and find the TSN that will be the one
10198                          * we report.
10199                          */
10200                         at = TAILQ_FIRST(&asoc->sent_queue);
10201                         if (at != NULL) {
10202                                 for (i = 0; i < cnt_of_skipped; i++) {
10203                                         tp1 = TAILQ_NEXT(at, sctp_next);
10204                                         if (tp1 == NULL) {
10205                                                 break;
10206                                         }
10207                                         at = tp1;
10208                                 }
10209                         }
10210                         if (at && SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_TRY_ADVANCE) {
10211                                 sctp_misc_ints(SCTP_FWD_TSN_CHECK,
10212                                     0xff, cnt_of_skipped, at->rec.data.TSN_seq,
10213                                     asoc->advanced_peer_ack_point);
10214                         }
10215                         last = at;
10216                         /*-
10217                          * last now points to last one I can report, update
10218                          * peer ack point
10219                          */
10220                         if (last)
10221                                 advance_peer_ack_point = last->rec.data.TSN_seq;
10222                         space_needed = sizeof(struct sctp_forward_tsn_chunk) +
10223                             cnt_of_skipped * sizeof(struct sctp_strseq);
10224                 }
10225                 chk->send_size = space_needed;
10226                 /* Setup the chunk */
10227                 fwdtsn = mtod(chk->data, struct sctp_forward_tsn_chunk *);
10228                 fwdtsn->ch.chunk_length = htons(chk->send_size);
10229                 fwdtsn->ch.chunk_flags = 0;
10230                 fwdtsn->ch.chunk_type = SCTP_FORWARD_CUM_TSN;
10231                 fwdtsn->new_cumulative_tsn = htonl(advance_peer_ack_point);
10232                 SCTP_BUF_LEN(chk->data) = chk->send_size;
10233                 fwdtsn++;
10234                 /*-
10235                  * Move pointer to after the fwdtsn and transfer to the
10236                  * strseq pointer.
10237                  */
10238                 strseq = (struct sctp_strseq *)fwdtsn;
10239                 /*-
10240                  * Now populate the strseq list. This is done blindly
10241                  * without pulling out duplicate stream info. This is
10242                  * inefficent but won't harm the process since the peer will
10243                  * look at these in sequence and will thus release anything.
10244                  * It could mean we exceed the PMTU and chop off some that
10245                  * we could have included.. but this is unlikely (aka 1432/4
10246                  * would mean 300+ stream seq's would have to be reported in
10247                  * one FWD-TSN. With a bit of work we can later FIX this to
10248                  * optimize and pull out duplcates.. but it does add more
10249                  * overhead. So for now... not!
10250                  */
10251                 at = TAILQ_FIRST(&asoc->sent_queue);
10252                 for (i = 0; i < cnt_of_skipped; i++) {
10253                         tp1 = TAILQ_NEXT(at, sctp_next);
10254                         if (tp1 == NULL)
10255                                 break;
10256                         if (at->rec.data.rcv_flags & SCTP_DATA_UNORDERED) {
10257                                 /* We don't report these */
10258                                 i--;
10259                                 at = tp1;
10260                                 continue;
10261                         }
10262                         if (at->rec.data.TSN_seq == advance_peer_ack_point) {
10263                                 at->rec.data.fwd_tsn_cnt = 0;
10264                         }
10265                         strseq->stream = ntohs(at->rec.data.stream_number);
10266                         strseq->sequence = ntohs(at->rec.data.stream_seq);
10267                         strseq++;
10268                         at = tp1;
10269                 }
10270         }
10271         return;
10272 }
10273
10274 void
10275 sctp_send_sack(struct sctp_tcb *stcb, int so_locked
10276 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
10277     SCTP_UNUSED
10278 #endif
10279 )
10280 {
10281         /*-
10282          * Queue up a SACK or NR-SACK in the control queue.
10283          * We must first check to see if a SACK or NR-SACK is
10284          * somehow on the control queue.
10285          * If so, we will take and and remove the old one.
10286          */
10287         struct sctp_association *asoc;
10288         struct sctp_tmit_chunk *chk, *a_chk;
10289         struct sctp_sack_chunk *sack;
10290         struct sctp_nr_sack_chunk *nr_sack;
10291         struct sctp_gap_ack_block *gap_descriptor;
10292         struct sack_track *selector;
10293         int mergeable = 0;
10294         int offset;
10295         caddr_t limit;
10296         uint32_t *dup;
10297         int limit_reached = 0;
10298         unsigned int i, siz, j;
10299         unsigned int num_gap_blocks = 0, num_nr_gap_blocks = 0, space;
10300         int num_dups = 0;
10301         int space_req;
10302         uint32_t highest_tsn;
10303         uint8_t flags;
10304         uint8_t type;
10305         uint8_t tsn_map;
10306
10307         if ((stcb->asoc.sctp_nr_sack_on_off == 1) &&
10308             (stcb->asoc.peer_supports_nr_sack == 1)) {
10309                 type = SCTP_NR_SELECTIVE_ACK;
10310         } else {
10311                 type = SCTP_SELECTIVE_ACK;
10312         }
10313         a_chk = NULL;
10314         asoc = &stcb->asoc;
10315         SCTP_TCB_LOCK_ASSERT(stcb);
10316         if (asoc->last_data_chunk_from == NULL) {
10317                 /* Hmm we never received anything */
10318                 return;
10319         }
10320         sctp_slide_mapping_arrays(stcb);
10321         sctp_set_rwnd(stcb, asoc);
10322         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
10323                 if (chk->rec.chunk_id.id == type) {
10324                         /* Hmm, found a sack already on queue, remove it */
10325                         TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
10326                         asoc->ctrl_queue_cnt--;
10327                         a_chk = chk;
10328                         if (a_chk->data) {
10329                                 sctp_m_freem(a_chk->data);
10330                                 a_chk->data = NULL;
10331                         }
10332                         if (a_chk->whoTo) {
10333                                 sctp_free_remote_addr(a_chk->whoTo);
10334                                 a_chk->whoTo = NULL;
10335                         }
10336                         break;
10337                 }
10338         }
10339         if (a_chk == NULL) {
10340                 sctp_alloc_a_chunk(stcb, a_chk);
10341                 if (a_chk == NULL) {
10342                         /* No memory so we drop the idea, and set a timer */
10343                         if (stcb->asoc.delayed_ack) {
10344                                 sctp_timer_stop(SCTP_TIMER_TYPE_RECV,
10345                                     stcb->sctp_ep, stcb, NULL, SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_5);
10346                                 sctp_timer_start(SCTP_TIMER_TYPE_RECV,
10347                                     stcb->sctp_ep, stcb, NULL);
10348                         } else {
10349                                 stcb->asoc.send_sack = 1;
10350                         }
10351                         return;
10352                 }
10353                 a_chk->copy_by_ref = 0;
10354                 a_chk->rec.chunk_id.id = type;
10355                 a_chk->rec.chunk_id.can_take_data = 1;
10356         }
10357         /* Clear our pkt counts */
10358         asoc->data_pkts_seen = 0;
10359
10360         a_chk->asoc = asoc;
10361         a_chk->snd_count = 0;
10362         a_chk->send_size = 0;   /* fill in later */
10363         a_chk->sent = SCTP_DATAGRAM_UNSENT;
10364         a_chk->whoTo = NULL;
10365
10366         if ((asoc->numduptsns) ||
10367             (!(asoc->last_data_chunk_from->dest_state & SCTP_ADDR_REACHABLE))) {
10368                 /*-
10369                  * Ok, we have some duplicates or the destination for the
10370                  * sack is unreachable, lets see if we can select an
10371                  * alternate than asoc->last_data_chunk_from
10372                  */
10373                 if ((asoc->last_data_chunk_from->dest_state & SCTP_ADDR_REACHABLE) &&
10374                     (asoc->used_alt_onsack > asoc->numnets)) {
10375                         /* We used an alt last time, don't this time */
10376                         a_chk->whoTo = NULL;
10377                 } else {
10378                         asoc->used_alt_onsack++;
10379                         a_chk->whoTo = sctp_find_alternate_net(stcb, asoc->last_data_chunk_from, 0);
10380                 }
10381                 if (a_chk->whoTo == NULL) {
10382                         /* Nope, no alternate */
10383                         a_chk->whoTo = asoc->last_data_chunk_from;
10384                         asoc->used_alt_onsack = 0;
10385                 }
10386         } else {
10387                 /*
10388                  * No duplicates so we use the last place we received data
10389                  * from.
10390                  */
10391                 asoc->used_alt_onsack = 0;
10392                 a_chk->whoTo = asoc->last_data_chunk_from;
10393         }
10394         if (a_chk->whoTo) {
10395                 atomic_add_int(&a_chk->whoTo->ref_count, 1);
10396         }
10397         if (SCTP_TSN_GT(asoc->highest_tsn_inside_map, asoc->highest_tsn_inside_nr_map)) {
10398                 highest_tsn = asoc->highest_tsn_inside_map;
10399         } else {
10400                 highest_tsn = asoc->highest_tsn_inside_nr_map;
10401         }
10402         if (highest_tsn == asoc->cumulative_tsn) {
10403                 /* no gaps */
10404                 if (type == SCTP_SELECTIVE_ACK) {
10405                         space_req = sizeof(struct sctp_sack_chunk);
10406                 } else {
10407                         space_req = sizeof(struct sctp_nr_sack_chunk);
10408                 }
10409         } else {
10410                 /* gaps get a cluster */
10411                 space_req = MCLBYTES;
10412         }
10413         /* Ok now lets formulate a MBUF with our sack */
10414         a_chk->data = sctp_get_mbuf_for_msg(space_req, 0, M_DONTWAIT, 1, MT_DATA);
10415         if ((a_chk->data == NULL) ||
10416             (a_chk->whoTo == NULL)) {
10417                 /* rats, no mbuf memory */
10418                 if (a_chk->data) {
10419                         /* was a problem with the destination */
10420                         sctp_m_freem(a_chk->data);
10421                         a_chk->data = NULL;
10422                 }
10423                 sctp_free_a_chunk(stcb, a_chk, so_locked);
10424                 /* sa_ignore NO_NULL_CHK */
10425                 if (stcb->asoc.delayed_ack) {
10426                         sctp_timer_stop(SCTP_TIMER_TYPE_RECV,
10427                             stcb->sctp_ep, stcb, NULL, SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_6);
10428                         sctp_timer_start(SCTP_TIMER_TYPE_RECV,
10429                             stcb->sctp_ep, stcb, NULL);
10430                 } else {
10431                         stcb->asoc.send_sack = 1;
10432                 }
10433                 return;
10434         }
10435         /* ok, lets go through and fill it in */
10436         SCTP_BUF_RESV_UF(a_chk->data, SCTP_MIN_OVERHEAD);
10437         space = M_TRAILINGSPACE(a_chk->data);
10438         if (space > (a_chk->whoTo->mtu - SCTP_MIN_OVERHEAD)) {
10439                 space = (a_chk->whoTo->mtu - SCTP_MIN_OVERHEAD);
10440         }
10441         limit = mtod(a_chk->data, caddr_t);
10442         limit += space;
10443
10444         flags = 0;
10445
10446         if ((asoc->sctp_cmt_on_off > 0) &&
10447             SCTP_BASE_SYSCTL(sctp_cmt_use_dac)) {
10448                 /*-
10449                  * CMT DAC algorithm: If 2 (i.e., 0x10) packets have been
10450                  * received, then set high bit to 1, else 0. Reset
10451                  * pkts_rcvd.
10452                  */
10453                 flags |= (asoc->cmt_dac_pkts_rcvd << 6);
10454                 asoc->cmt_dac_pkts_rcvd = 0;
10455         }
10456 #ifdef SCTP_ASOCLOG_OF_TSNS
10457         stcb->asoc.cumack_logsnt[stcb->asoc.cumack_log_atsnt] = asoc->cumulative_tsn;
10458         stcb->asoc.cumack_log_atsnt++;
10459         if (stcb->asoc.cumack_log_atsnt >= SCTP_TSN_LOG_SIZE) {
10460                 stcb->asoc.cumack_log_atsnt = 0;
10461         }
10462 #endif
10463         /* reset the readers interpretation */
10464         stcb->freed_by_sorcv_sincelast = 0;
10465
10466         if (type == SCTP_SELECTIVE_ACK) {
10467                 sack = mtod(a_chk->data, struct sctp_sack_chunk *);
10468                 nr_sack = NULL;
10469                 gap_descriptor = (struct sctp_gap_ack_block *)((caddr_t)sack + sizeof(struct sctp_sack_chunk));
10470                 if (highest_tsn > asoc->mapping_array_base_tsn) {
10471                         siz = (((highest_tsn - asoc->mapping_array_base_tsn) + 1) + 7) / 8;
10472                 } else {
10473                         siz = (((MAX_TSN - highest_tsn) + 1) + highest_tsn + 7) / 8;
10474                 }
10475         } else {
10476                 sack = NULL;
10477                 nr_sack = mtod(a_chk->data, struct sctp_nr_sack_chunk *);
10478                 gap_descriptor = (struct sctp_gap_ack_block *)((caddr_t)nr_sack + sizeof(struct sctp_nr_sack_chunk));
10479                 if (asoc->highest_tsn_inside_map > asoc->mapping_array_base_tsn) {
10480                         siz = (((asoc->highest_tsn_inside_map - asoc->mapping_array_base_tsn) + 1) + 7) / 8;
10481                 } else {
10482                         siz = (((MAX_TSN - asoc->mapping_array_base_tsn) + 1) + asoc->highest_tsn_inside_map + 7) / 8;
10483                 }
10484         }
10485
10486         if (SCTP_TSN_GT(asoc->mapping_array_base_tsn, asoc->cumulative_tsn)) {
10487                 offset = 1;
10488         } else {
10489                 offset = asoc->mapping_array_base_tsn - asoc->cumulative_tsn;
10490         }
10491         if (((type == SCTP_SELECTIVE_ACK) &&
10492             SCTP_TSN_GT(highest_tsn, asoc->cumulative_tsn)) ||
10493             ((type == SCTP_NR_SELECTIVE_ACK) &&
10494             SCTP_TSN_GT(asoc->highest_tsn_inside_map, asoc->cumulative_tsn))) {
10495                 /* we have a gap .. maybe */
10496                 for (i = 0; i < siz; i++) {
10497                         tsn_map = asoc->mapping_array[i];
10498                         if (type == SCTP_SELECTIVE_ACK) {
10499                                 tsn_map |= asoc->nr_mapping_array[i];
10500                         }
10501                         if (i == 0) {
10502                                 /*
10503                                  * Clear all bits corresponding to TSNs
10504                                  * smaller or equal to the cumulative TSN.
10505                                  */
10506                                 tsn_map &= (~0 << (1 - offset));
10507                         }
10508                         selector = &sack_array[tsn_map];
10509                         if (mergeable && selector->right_edge) {
10510                                 /*
10511                                  * Backup, left and right edges were ok to
10512                                  * merge.
10513                                  */
10514                                 num_gap_blocks--;
10515                                 gap_descriptor--;
10516                         }
10517                         if (selector->num_entries == 0)
10518                                 mergeable = 0;
10519                         else {
10520                                 for (j = 0; j < selector->num_entries; j++) {
10521                                         if (mergeable && selector->right_edge) {
10522                                                 /*
10523                                                  * do a merge by NOT setting
10524                                                  * the left side
10525                                                  */
10526                                                 mergeable = 0;
10527                                         } else {
10528                                                 /*
10529                                                  * no merge, set the left
10530                                                  * side
10531                                                  */
10532                                                 mergeable = 0;
10533                                                 gap_descriptor->start = htons((selector->gaps[j].start + offset));
10534                                         }
10535                                         gap_descriptor->end = htons((selector->gaps[j].end + offset));
10536                                         num_gap_blocks++;
10537                                         gap_descriptor++;
10538                                         if (((caddr_t)gap_descriptor + sizeof(struct sctp_gap_ack_block)) > limit) {
10539                                                 /* no more room */
10540                                                 limit_reached = 1;
10541                                                 break;
10542                                         }
10543                                 }
10544                                 if (selector->left_edge) {
10545                                         mergeable = 1;
10546                                 }
10547                         }
10548                         if (limit_reached) {
10549                                 /* Reached the limit stop */
10550                                 break;
10551                         }
10552                         offset += 8;
10553                 }
10554         }
10555         if ((type == SCTP_NR_SELECTIVE_ACK) &&
10556             (limit_reached == 0)) {
10557
10558                 mergeable = 0;
10559
10560                 if (asoc->highest_tsn_inside_nr_map > asoc->mapping_array_base_tsn) {
10561                         siz = (((asoc->highest_tsn_inside_nr_map - asoc->mapping_array_base_tsn) + 1) + 7) / 8;
10562                 } else {
10563                         siz = (((MAX_TSN - asoc->mapping_array_base_tsn) + 1) + asoc->highest_tsn_inside_nr_map + 7) / 8;
10564                 }
10565
10566                 if (SCTP_TSN_GT(asoc->mapping_array_base_tsn, asoc->cumulative_tsn)) {
10567                         offset = 1;
10568                 } else {
10569                         offset = asoc->mapping_array_base_tsn - asoc->cumulative_tsn;
10570                 }
10571                 if (SCTP_TSN_GT(asoc->highest_tsn_inside_nr_map, asoc->cumulative_tsn)) {
10572                         /* we have a gap .. maybe */
10573                         for (i = 0; i < siz; i++) {
10574                                 tsn_map = asoc->nr_mapping_array[i];
10575                                 if (i == 0) {
10576                                         /*
10577                                          * Clear all bits corresponding to
10578                                          * TSNs smaller or equal to the
10579                                          * cumulative TSN.
10580                                          */
10581                                         tsn_map &= (~0 << (1 - offset));
10582                                 }
10583                                 selector = &sack_array[tsn_map];
10584                                 if (mergeable && selector->right_edge) {
10585                                         /*
10586                                          * Backup, left and right edges were
10587                                          * ok to merge.
10588                                          */
10589                                         num_nr_gap_blocks--;
10590                                         gap_descriptor--;
10591                                 }
10592                                 if (selector->num_entries == 0)
10593                                         mergeable = 0;
10594                                 else {
10595                                         for (j = 0; j < selector->num_entries; j++) {
10596                                                 if (mergeable && selector->right_edge) {
10597                                                         /*
10598                                                          * do a merge by NOT
10599                                                          * setting the left
10600                                                          * side
10601                                                          */
10602                                                         mergeable = 0;
10603                                                 } else {
10604                                                         /*
10605                                                          * no merge, set the
10606                                                          * left side
10607                                                          */
10608                                                         mergeable = 0;
10609                                                         gap_descriptor->start = htons((selector->gaps[j].start + offset));
10610                                                 }
10611                                                 gap_descriptor->end = htons((selector->gaps[j].end + offset));
10612                                                 num_nr_gap_blocks++;
10613                                                 gap_descriptor++;
10614                                                 if (((caddr_t)gap_descriptor + sizeof(struct sctp_gap_ack_block)) > limit) {
10615                                                         /* no more room */
10616                                                         limit_reached = 1;
10617                                                         break;
10618                                                 }
10619                                         }
10620                                         if (selector->left_edge) {
10621                                                 mergeable = 1;
10622                                         }
10623                                 }
10624                                 if (limit_reached) {
10625                                         /* Reached the limit stop */
10626                                         break;
10627                                 }
10628                                 offset += 8;
10629                         }
10630                 }
10631         }
10632         /* now we must add any dups we are going to report. */
10633         if ((limit_reached == 0) && (asoc->numduptsns)) {
10634                 dup = (uint32_t *) gap_descriptor;
10635                 for (i = 0; i < asoc->numduptsns; i++) {
10636                         *dup = htonl(asoc->dup_tsns[i]);
10637                         dup++;
10638                         num_dups++;
10639                         if (((caddr_t)dup + sizeof(uint32_t)) > limit) {
10640                                 /* no more room */
10641                                 break;
10642                         }
10643                 }
10644                 asoc->numduptsns = 0;
10645         }
10646         /*
10647          * now that the chunk is prepared queue it to the control chunk
10648          * queue.
10649          */
10650         if (type == SCTP_SELECTIVE_ACK) {
10651                 a_chk->send_size = sizeof(struct sctp_sack_chunk) +
10652                     (num_gap_blocks + num_nr_gap_blocks) * sizeof(struct sctp_gap_ack_block) +
10653                     num_dups * sizeof(int32_t);
10654                 SCTP_BUF_LEN(a_chk->data) = a_chk->send_size;
10655                 sack->sack.cum_tsn_ack = htonl(asoc->cumulative_tsn);
10656                 sack->sack.a_rwnd = htonl(asoc->my_rwnd);
10657                 sack->sack.num_gap_ack_blks = htons(num_gap_blocks);
10658                 sack->sack.num_dup_tsns = htons(num_dups);
10659                 sack->ch.chunk_type = type;
10660                 sack->ch.chunk_flags = flags;
10661                 sack->ch.chunk_length = htons(a_chk->send_size);
10662         } else {
10663                 a_chk->send_size = sizeof(struct sctp_nr_sack_chunk) +
10664                     (num_gap_blocks + num_nr_gap_blocks) * sizeof(struct sctp_gap_ack_block) +
10665                     num_dups * sizeof(int32_t);
10666                 SCTP_BUF_LEN(a_chk->data) = a_chk->send_size;
10667                 nr_sack->nr_sack.cum_tsn_ack = htonl(asoc->cumulative_tsn);
10668                 nr_sack->nr_sack.a_rwnd = htonl(asoc->my_rwnd);
10669                 nr_sack->nr_sack.num_gap_ack_blks = htons(num_gap_blocks);
10670                 nr_sack->nr_sack.num_nr_gap_ack_blks = htons(num_nr_gap_blocks);
10671                 nr_sack->nr_sack.num_dup_tsns = htons(num_dups);
10672                 nr_sack->nr_sack.reserved = 0;
10673                 nr_sack->ch.chunk_type = type;
10674                 nr_sack->ch.chunk_flags = flags;
10675                 nr_sack->ch.chunk_length = htons(a_chk->send_size);
10676         }
10677         TAILQ_INSERT_TAIL(&asoc->control_send_queue, a_chk, sctp_next);
10678         asoc->my_last_reported_rwnd = asoc->my_rwnd;
10679         asoc->ctrl_queue_cnt++;
10680         asoc->send_sack = 0;
10681         SCTP_STAT_INCR(sctps_sendsacks);
10682         return;
10683 }
10684
10685 void
10686 sctp_send_abort_tcb(struct sctp_tcb *stcb, struct mbuf *operr, int so_locked
10687 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
10688     SCTP_UNUSED
10689 #endif
10690 )
10691 {
10692         struct mbuf *m_abort;
10693         struct mbuf *m_out = NULL, *m_end = NULL;
10694         struct sctp_abort_chunk *abort = NULL;
10695         int sz;
10696         uint32_t auth_offset = 0;
10697         struct sctp_auth_chunk *auth = NULL;
10698         struct sctp_nets *net;
10699
10700         /*-
10701          * Add an AUTH chunk, if chunk requires it and save the offset into
10702          * the chain for AUTH
10703          */
10704         if (sctp_auth_is_required_chunk(SCTP_ABORT_ASSOCIATION,
10705             stcb->asoc.peer_auth_chunks)) {
10706                 m_out = sctp_add_auth_chunk(m_out, &m_end, &auth, &auth_offset,
10707                     stcb, SCTP_ABORT_ASSOCIATION);
10708                 SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
10709         }
10710         SCTP_TCB_LOCK_ASSERT(stcb);
10711         m_abort = sctp_get_mbuf_for_msg(sizeof(struct sctp_abort_chunk), 0, M_DONTWAIT, 1, MT_HEADER);
10712         if (m_abort == NULL) {
10713                 /* no mbuf's */
10714                 if (m_out)
10715                         sctp_m_freem(m_out);
10716                 return;
10717         }
10718         /* link in any error */
10719         SCTP_BUF_NEXT(m_abort) = operr;
10720         sz = 0;
10721         if (operr) {
10722                 struct mbuf *n;
10723
10724                 n = operr;
10725                 while (n) {
10726                         sz += SCTP_BUF_LEN(n);
10727                         n = SCTP_BUF_NEXT(n);
10728                 }
10729         }
10730         SCTP_BUF_LEN(m_abort) = sizeof(*abort);
10731         if (m_out == NULL) {
10732                 /* NO Auth chunk prepended, so reserve space in front */
10733                 SCTP_BUF_RESV_UF(m_abort, SCTP_MIN_OVERHEAD);
10734                 m_out = m_abort;
10735         } else {
10736                 /* Put AUTH chunk at the front of the chain */
10737                 SCTP_BUF_NEXT(m_end) = m_abort;
10738         }
10739         if (stcb->asoc.alternate) {
10740                 net = stcb->asoc.alternate;
10741         } else {
10742                 net = stcb->asoc.primary_destination;
10743         }
10744         /* fill in the ABORT chunk */
10745         abort = mtod(m_abort, struct sctp_abort_chunk *);
10746         abort->ch.chunk_type = SCTP_ABORT_ASSOCIATION;
10747         abort->ch.chunk_flags = 0;
10748         abort->ch.chunk_length = htons(sizeof(*abort) + sz);
10749
10750         (void)sctp_lowlevel_chunk_output(stcb->sctp_ep, stcb, net,
10751             (struct sockaddr *)&net->ro._l_addr,
10752             m_out, auth_offset, auth, stcb->asoc.authinfo.active_keyid, 1, 0, 0,
10753             stcb->sctp_ep->sctp_lport, stcb->rport, htonl(stcb->asoc.peer_vtag),
10754             stcb->asoc.primary_destination->port, NULL,
10755             0, 0,
10756             so_locked);
10757         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
10758 }
10759
10760 void
10761 sctp_send_shutdown_complete(struct sctp_tcb *stcb,
10762     struct sctp_nets *net,
10763     int reflect_vtag)
10764 {
10765         /* formulate and SEND a SHUTDOWN-COMPLETE */
10766         struct mbuf *m_shutdown_comp;
10767         struct sctp_shutdown_complete_chunk *shutdown_complete;
10768         uint32_t vtag;
10769         uint8_t flags;
10770
10771         m_shutdown_comp = sctp_get_mbuf_for_msg(sizeof(struct sctp_chunkhdr), 0, M_DONTWAIT, 1, MT_HEADER);
10772         if (m_shutdown_comp == NULL) {
10773                 /* no mbuf's */
10774                 return;
10775         }
10776         if (reflect_vtag) {
10777                 flags = SCTP_HAD_NO_TCB;
10778                 vtag = stcb->asoc.my_vtag;
10779         } else {
10780                 flags = 0;
10781                 vtag = stcb->asoc.peer_vtag;
10782         }
10783         shutdown_complete = mtod(m_shutdown_comp, struct sctp_shutdown_complete_chunk *);
10784         shutdown_complete->ch.chunk_type = SCTP_SHUTDOWN_COMPLETE;
10785         shutdown_complete->ch.chunk_flags = flags;
10786         shutdown_complete->ch.chunk_length = htons(sizeof(struct sctp_shutdown_complete_chunk));
10787         SCTP_BUF_LEN(m_shutdown_comp) = sizeof(struct sctp_shutdown_complete_chunk);
10788         (void)sctp_lowlevel_chunk_output(stcb->sctp_ep, stcb, net,
10789             (struct sockaddr *)&net->ro._l_addr,
10790             m_shutdown_comp, 0, NULL, 0, 1, 0, 0,
10791             stcb->sctp_ep->sctp_lport, stcb->rport,
10792             htonl(vtag),
10793             net->port, NULL,
10794             0, 0,
10795             SCTP_SO_NOT_LOCKED);
10796         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
10797         return;
10798 }
10799
10800 static void
10801 sctp_send_resp_msg(struct sockaddr *src, struct sockaddr *dst,
10802     struct sctphdr *sh, uint32_t vtag,
10803     uint8_t type, struct mbuf *cause,
10804     uint8_t use_mflowid, uint32_t mflowid,
10805     uint32_t vrf_id, uint16_t port)
10806 {
10807         struct mbuf *o_pak;
10808         struct mbuf *mout;
10809         struct sctphdr *shout;
10810         struct sctp_chunkhdr *ch;
10811         struct udphdr *udp;
10812         int len, cause_len, padding_len, ret;
10813
10814 #ifdef INET
10815         struct sockaddr_in *src_sin, *dst_sin;
10816         struct ip *ip;
10817
10818 #endif
10819 #ifdef INET6
10820         struct sockaddr_in6 *src_sin6, *dst_sin6;
10821         struct ip6_hdr *ip6;
10822
10823 #endif
10824
10825         /* Compute the length of the cause and add final padding. */
10826         cause_len = 0;
10827         if (cause != NULL) {
10828                 struct mbuf *m_at, *m_last = NULL;
10829
10830                 for (m_at = cause; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
10831                         if (SCTP_BUF_NEXT(m_at) == NULL)
10832                                 m_last = m_at;
10833                         cause_len += SCTP_BUF_LEN(m_at);
10834                 }
10835                 padding_len = cause_len % 4;
10836                 if (padding_len != 0) {
10837                         padding_len = 4 - padding_len;
10838                 }
10839                 if (padding_len != 0) {
10840                         if (sctp_add_pad_tombuf(m_last, padding_len)) {
10841                                 sctp_m_freem(cause);
10842                                 return;
10843                         }
10844                 }
10845         } else {
10846                 padding_len = 0;
10847         }
10848         /* Get an mbuf for the header. */
10849         len = sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
10850         switch (dst->sa_family) {
10851 #ifdef INET
10852         case AF_INET:
10853                 len += sizeof(struct ip);
10854                 break;
10855 #endif
10856 #ifdef INET6
10857         case AF_INET6:
10858                 len += sizeof(struct ip6_hdr);
10859                 break;
10860 #endif
10861         default:
10862                 break;
10863         }
10864         if (port) {
10865                 len += sizeof(struct udphdr);
10866         }
10867         mout = sctp_get_mbuf_for_msg(len + max_linkhdr, 1, M_DONTWAIT, 1, MT_DATA);
10868         if (mout == NULL) {
10869                 if (cause) {
10870                         sctp_m_freem(cause);
10871                 }
10872                 return;
10873         }
10874         SCTP_BUF_RESV_UF(mout, max_linkhdr);
10875         SCTP_BUF_LEN(mout) = len;
10876         SCTP_BUF_NEXT(mout) = cause;
10877         if (use_mflowid != 0) {
10878                 mout->m_pkthdr.flowid = mflowid;
10879                 mout->m_flags |= M_FLOWID;
10880         }
10881 #ifdef INET
10882         ip = NULL;
10883 #endif
10884 #ifdef INET6
10885         ip6 = NULL;
10886 #endif
10887         switch (dst->sa_family) {
10888 #ifdef INET
10889         case AF_INET:
10890                 src_sin = (struct sockaddr_in *)src;
10891                 dst_sin = (struct sockaddr_in *)dst;
10892                 ip = mtod(mout, struct ip *);
10893                 ip->ip_v = IPVERSION;
10894                 ip->ip_hl = (sizeof(struct ip) >> 2);
10895                 ip->ip_tos = 0;
10896                 ip->ip_id = ip_newid();
10897                 ip->ip_off = 0;
10898                 ip->ip_ttl = MODULE_GLOBAL(ip_defttl);
10899                 if (port) {
10900                         ip->ip_p = IPPROTO_UDP;
10901                 } else {
10902                         ip->ip_p = IPPROTO_SCTP;
10903                 }
10904                 ip->ip_src.s_addr = dst_sin->sin_addr.s_addr;
10905                 ip->ip_dst.s_addr = src_sin->sin_addr.s_addr;
10906                 ip->ip_sum = 0;
10907                 len = sizeof(struct ip);
10908                 shout = (struct sctphdr *)((caddr_t)ip + len);
10909                 break;
10910 #endif
10911 #ifdef INET6
10912         case AF_INET6:
10913                 src_sin6 = (struct sockaddr_in6 *)src;
10914                 dst_sin6 = (struct sockaddr_in6 *)dst;
10915                 ip6 = mtod(mout, struct ip6_hdr *);
10916                 ip6->ip6_flow = htonl(0x60000000);
10917                 if (V_ip6_auto_flowlabel) {
10918                         ip6->ip6_flow |= (htonl(ip6_randomflowlabel()) & IPV6_FLOWLABEL_MASK);
10919                 }
10920                 ip6->ip6_hlim = MODULE_GLOBAL(ip6_defhlim);
10921                 if (port) {
10922                         ip6->ip6_nxt = IPPROTO_UDP;
10923                 } else {
10924                         ip6->ip6_nxt = IPPROTO_SCTP;
10925                 }
10926                 ip6->ip6_src = dst_sin6->sin6_addr;
10927                 ip6->ip6_dst = src_sin6->sin6_addr;
10928                 len = sizeof(struct ip6_hdr);
10929                 shout = (struct sctphdr *)((caddr_t)ip6 + len);
10930                 break;
10931 #endif
10932         default:
10933                 len = 0;
10934                 shout = mtod(mout, struct sctphdr *);
10935                 break;
10936         }
10937         if (port) {
10938                 if (htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port)) == 0) {
10939                         sctp_m_freem(mout);
10940                         return;
10941                 }
10942                 udp = (struct udphdr *)shout;
10943                 udp->uh_sport = htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port));
10944                 udp->uh_dport = port;
10945                 udp->uh_sum = 0;
10946                 udp->uh_ulen = htons(sizeof(struct udphdr) +
10947                     sizeof(struct sctphdr) +
10948                     sizeof(struct sctp_chunkhdr) +
10949                     cause_len + padding_len);
10950                 len += sizeof(struct udphdr);
10951                 shout = (struct sctphdr *)((caddr_t)shout + sizeof(struct udphdr));
10952         } else {
10953                 udp = NULL;
10954         }
10955         shout->src_port = sh->dest_port;
10956         shout->dest_port = sh->src_port;
10957         shout->checksum = 0;
10958         if (vtag) {
10959                 shout->v_tag = htonl(vtag);
10960         } else {
10961                 shout->v_tag = sh->v_tag;
10962         }
10963         len += sizeof(struct sctphdr);
10964         ch = (struct sctp_chunkhdr *)((caddr_t)shout + sizeof(struct sctphdr));
10965         ch->chunk_type = type;
10966         if (vtag) {
10967                 ch->chunk_flags = 0;
10968         } else {
10969                 ch->chunk_flags = SCTP_HAD_NO_TCB;
10970         }
10971         ch->chunk_length = htons(sizeof(struct sctp_chunkhdr) + cause_len);
10972         len += sizeof(struct sctp_chunkhdr);
10973         len += cause_len + padding_len;
10974
10975         if (SCTP_GET_HEADER_FOR_OUTPUT(o_pak)) {
10976                 sctp_m_freem(mout);
10977                 return;
10978         }
10979         SCTP_ATTACH_CHAIN(o_pak, mout, len);
10980         switch (dst->sa_family) {
10981 #ifdef INET
10982         case AF_INET:
10983                 if (port) {
10984                         if (V_udp_cksum) {
10985                                 udp->uh_sum = in_pseudo(ip->ip_src.s_addr, ip->ip_dst.s_addr, udp->uh_ulen + htons(IPPROTO_UDP));
10986                         } else {
10987                                 udp->uh_sum = 0;
10988                         }
10989                 }
10990                 ip->ip_len = len;
10991                 if (port) {
10992 #if defined(SCTP_WITH_NO_CSUM)
10993                         SCTP_STAT_INCR(sctps_sendnocrc);
10994 #else
10995                         shout->checksum = sctp_calculate_cksum(mout, sizeof(struct ip) + sizeof(struct udphdr));
10996                         SCTP_STAT_INCR(sctps_sendswcrc);
10997 #endif
10998                         if (V_udp_cksum) {
10999                                 SCTP_ENABLE_UDP_CSUM(o_pak);
11000                         }
11001                 } else {
11002 #if defined(SCTP_WITH_NO_CSUM)
11003                         SCTP_STAT_INCR(sctps_sendnocrc);
11004 #else
11005                         mout->m_pkthdr.csum_flags = CSUM_SCTP;
11006                         mout->m_pkthdr.csum_data = 0;
11007                         SCTP_STAT_INCR(sctps_sendhwcrc);
11008 #endif
11009                 }
11010 #ifdef SCTP_PACKET_LOGGING
11011                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING) {
11012                         sctp_packet_log(o_pak);
11013                 }
11014 #endif
11015                 SCTP_IP_OUTPUT(ret, o_pak, NULL, NULL, vrf_id);
11016                 break;
11017 #endif
11018 #ifdef INET6
11019         case AF_INET6:
11020                 ip6->ip6_plen = len - sizeof(struct ip6_hdr);
11021                 if (port) {
11022 #if defined(SCTP_WITH_NO_CSUM)
11023                         SCTP_STAT_INCR(sctps_sendnocrc);
11024 #else
11025                         shout->checksum = sctp_calculate_cksum(mout, sizeof(struct ip6_hdr) + sizeof(struct udphdr));
11026                         SCTP_STAT_INCR(sctps_sendswcrc);
11027 #endif
11028                         if ((udp->uh_sum = in6_cksum(o_pak, IPPROTO_UDP, sizeof(struct ip6_hdr), len - sizeof(struct ip6_hdr))) == 0) {
11029                                 udp->uh_sum = 0xffff;
11030                         }
11031                 } else {
11032 #if defined(SCTP_WITH_NO_CSUM)
11033                         SCTP_STAT_INCR(sctps_sendnocrc);
11034 #else
11035                         mout->m_pkthdr.csum_flags = CSUM_SCTP;
11036                         mout->m_pkthdr.csum_data = 0;
11037                         SCTP_STAT_INCR(sctps_sendhwcrc);
11038 #endif
11039                 }
11040 #ifdef SCTP_PACKET_LOGGING
11041                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING) {
11042                         sctp_packet_log(o_pak);
11043                 }
11044 #endif
11045                 SCTP_IP6_OUTPUT(ret, o_pak, NULL, NULL, NULL, vrf_id);
11046                 break;
11047 #endif
11048         default:
11049                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Unknown protocol (TSNH) type %d\n",
11050                     dst->sa_family);
11051                 sctp_m_freem(mout);
11052                 SCTP_LTRACE_ERR_RET_PKT(mout, NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EFAULT);
11053                 return;
11054         }
11055         SCTP_STAT_INCR(sctps_sendpackets);
11056         SCTP_STAT_INCR_COUNTER64(sctps_outpackets);
11057         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
11058         return;
11059 }
11060
11061 void
11062 sctp_send_shutdown_complete2(struct sockaddr *src, struct sockaddr *dst,
11063     struct sctphdr *sh,
11064     uint8_t use_mflowid, uint32_t mflowid,
11065     uint32_t vrf_id, uint16_t port)
11066 {
11067         sctp_send_resp_msg(src, dst, sh, 0, SCTP_SHUTDOWN_COMPLETE, NULL,
11068             use_mflowid, mflowid,
11069             vrf_id, port);
11070 }
11071
11072 void
11073 sctp_send_hb(struct sctp_tcb *stcb, struct sctp_nets *net, int so_locked
11074 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
11075     SCTP_UNUSED
11076 #endif
11077 )
11078 {
11079         struct sctp_tmit_chunk *chk;
11080         struct sctp_heartbeat_chunk *hb;
11081         struct timeval now;
11082
11083         SCTP_TCB_LOCK_ASSERT(stcb);
11084         if (net == NULL) {
11085                 return;
11086         }
11087         (void)SCTP_GETTIME_TIMEVAL(&now);
11088         switch (net->ro._l_addr.sa.sa_family) {
11089 #ifdef INET
11090         case AF_INET:
11091                 break;
11092 #endif
11093 #ifdef INET6
11094         case AF_INET6:
11095                 break;
11096 #endif
11097         default:
11098                 return;
11099         }
11100         sctp_alloc_a_chunk(stcb, chk);
11101         if (chk == NULL) {
11102                 SCTPDBG(SCTP_DEBUG_OUTPUT4, "Gak, can't get a chunk for hb\n");
11103                 return;
11104         }
11105         chk->copy_by_ref = 0;
11106         chk->rec.chunk_id.id = SCTP_HEARTBEAT_REQUEST;
11107         chk->rec.chunk_id.can_take_data = 1;
11108         chk->asoc = &stcb->asoc;
11109         chk->send_size = sizeof(struct sctp_heartbeat_chunk);
11110
11111         chk->data = sctp_get_mbuf_for_msg(chk->send_size, 0, M_DONTWAIT, 1, MT_HEADER);
11112         if (chk->data == NULL) {
11113                 sctp_free_a_chunk(stcb, chk, so_locked);
11114                 return;
11115         }
11116         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11117         SCTP_BUF_LEN(chk->data) = chk->send_size;
11118         chk->sent = SCTP_DATAGRAM_UNSENT;
11119         chk->snd_count = 0;
11120         chk->whoTo = net;
11121         atomic_add_int(&chk->whoTo->ref_count, 1);
11122         /* Now we have a mbuf that we can fill in with the details */
11123         hb = mtod(chk->data, struct sctp_heartbeat_chunk *);
11124         memset(hb, 0, sizeof(struct sctp_heartbeat_chunk));
11125         /* fill out chunk header */
11126         hb->ch.chunk_type = SCTP_HEARTBEAT_REQUEST;
11127         hb->ch.chunk_flags = 0;
11128         hb->ch.chunk_length = htons(chk->send_size);
11129         /* Fill out hb parameter */
11130         hb->heartbeat.hb_info.ph.param_type = htons(SCTP_HEARTBEAT_INFO);
11131         hb->heartbeat.hb_info.ph.param_length = htons(sizeof(struct sctp_heartbeat_info_param));
11132         hb->heartbeat.hb_info.time_value_1 = now.tv_sec;
11133         hb->heartbeat.hb_info.time_value_2 = now.tv_usec;
11134         /* Did our user request this one, put it in */
11135         hb->heartbeat.hb_info.addr_family = net->ro._l_addr.sa.sa_family;
11136         hb->heartbeat.hb_info.addr_len = net->ro._l_addr.sa.sa_len;
11137         if (net->dest_state & SCTP_ADDR_UNCONFIRMED) {
11138                 /*
11139                  * we only take from the entropy pool if the address is not
11140                  * confirmed.
11141                  */
11142                 net->heartbeat_random1 = hb->heartbeat.hb_info.random_value1 = sctp_select_initial_TSN(&stcb->sctp_ep->sctp_ep);
11143                 net->heartbeat_random2 = hb->heartbeat.hb_info.random_value2 = sctp_select_initial_TSN(&stcb->sctp_ep->sctp_ep);
11144         } else {
11145                 net->heartbeat_random1 = hb->heartbeat.hb_info.random_value1 = 0;
11146                 net->heartbeat_random2 = hb->heartbeat.hb_info.random_value2 = 0;
11147         }
11148         switch (net->ro._l_addr.sa.sa_family) {
11149 #ifdef INET
11150         case AF_INET:
11151                 memcpy(hb->heartbeat.hb_info.address,
11152                     &net->ro._l_addr.sin.sin_addr,
11153                     sizeof(net->ro._l_addr.sin.sin_addr));
11154                 break;
11155 #endif
11156 #ifdef INET6
11157         case AF_INET6:
11158                 memcpy(hb->heartbeat.hb_info.address,
11159                     &net->ro._l_addr.sin6.sin6_addr,
11160                     sizeof(net->ro._l_addr.sin6.sin6_addr));
11161                 break;
11162 #endif
11163         default:
11164                 return;
11165                 break;
11166         }
11167         net->hb_responded = 0;
11168         TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
11169         stcb->asoc.ctrl_queue_cnt++;
11170         SCTP_STAT_INCR(sctps_sendheartbeat);
11171         return;
11172 }
11173
11174 void
11175 sctp_send_ecn_echo(struct sctp_tcb *stcb, struct sctp_nets *net,
11176     uint32_t high_tsn)
11177 {
11178         struct sctp_association *asoc;
11179         struct sctp_ecne_chunk *ecne;
11180         struct sctp_tmit_chunk *chk;
11181
11182         if (net == NULL) {
11183                 return;
11184         }
11185         asoc = &stcb->asoc;
11186         SCTP_TCB_LOCK_ASSERT(stcb);
11187         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
11188                 if ((chk->rec.chunk_id.id == SCTP_ECN_ECHO) && (net == chk->whoTo)) {
11189                         /* found a previous ECN_ECHO update it if needed */
11190                         uint32_t cnt, ctsn;
11191
11192                         ecne = mtod(chk->data, struct sctp_ecne_chunk *);
11193                         ctsn = ntohl(ecne->tsn);
11194                         if (SCTP_TSN_GT(high_tsn, ctsn)) {
11195                                 ecne->tsn = htonl(high_tsn);
11196                                 SCTP_STAT_INCR(sctps_queue_upd_ecne);
11197                         }
11198                         cnt = ntohl(ecne->num_pkts_since_cwr);
11199                         cnt++;
11200                         ecne->num_pkts_since_cwr = htonl(cnt);
11201                         return;
11202                 }
11203         }
11204         /* nope could not find one to update so we must build one */
11205         sctp_alloc_a_chunk(stcb, chk);
11206         if (chk == NULL) {
11207                 return;
11208         }
11209         chk->copy_by_ref = 0;
11210         SCTP_STAT_INCR(sctps_queue_upd_ecne);
11211         chk->rec.chunk_id.id = SCTP_ECN_ECHO;
11212         chk->rec.chunk_id.can_take_data = 0;
11213         chk->asoc = &stcb->asoc;
11214         chk->send_size = sizeof(struct sctp_ecne_chunk);
11215         chk->data = sctp_get_mbuf_for_msg(chk->send_size, 0, M_DONTWAIT, 1, MT_HEADER);
11216         if (chk->data == NULL) {
11217                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
11218                 return;
11219         }
11220         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11221         SCTP_BUF_LEN(chk->data) = chk->send_size;
11222         chk->sent = SCTP_DATAGRAM_UNSENT;
11223         chk->snd_count = 0;
11224         chk->whoTo = net;
11225         atomic_add_int(&chk->whoTo->ref_count, 1);
11226
11227         stcb->asoc.ecn_echo_cnt_onq++;
11228         ecne = mtod(chk->data, struct sctp_ecne_chunk *);
11229         ecne->ch.chunk_type = SCTP_ECN_ECHO;
11230         ecne->ch.chunk_flags = 0;
11231         ecne->ch.chunk_length = htons(sizeof(struct sctp_ecne_chunk));
11232         ecne->tsn = htonl(high_tsn);
11233         ecne->num_pkts_since_cwr = htonl(1);
11234         TAILQ_INSERT_HEAD(&stcb->asoc.control_send_queue, chk, sctp_next);
11235         asoc->ctrl_queue_cnt++;
11236 }
11237
11238 void
11239 sctp_send_packet_dropped(struct sctp_tcb *stcb, struct sctp_nets *net,
11240     struct mbuf *m, int len, int iphlen, int bad_crc)
11241 {
11242         struct sctp_association *asoc;
11243         struct sctp_pktdrop_chunk *drp;
11244         struct sctp_tmit_chunk *chk;
11245         uint8_t *datap;
11246         int was_trunc = 0;
11247         int fullsz = 0;
11248         long spc;
11249         int offset;
11250         struct sctp_chunkhdr *ch, chunk_buf;
11251         unsigned int chk_length;
11252
11253         if (!stcb) {
11254                 return;
11255         }
11256         asoc = &stcb->asoc;
11257         SCTP_TCB_LOCK_ASSERT(stcb);
11258         if (asoc->peer_supports_pktdrop == 0) {
11259                 /*-
11260                  * peer must declare support before I send one.
11261                  */
11262                 return;
11263         }
11264         if (stcb->sctp_socket == NULL) {
11265                 return;
11266         }
11267         sctp_alloc_a_chunk(stcb, chk);
11268         if (chk == NULL) {
11269                 return;
11270         }
11271         chk->copy_by_ref = 0;
11272         len -= iphlen;
11273         chk->send_size = len;
11274         /* Validate that we do not have an ABORT in here. */
11275         offset = iphlen + sizeof(struct sctphdr);
11276         ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, offset,
11277             sizeof(*ch), (uint8_t *) & chunk_buf);
11278         while (ch != NULL) {
11279                 chk_length = ntohs(ch->chunk_length);
11280                 if (chk_length < sizeof(*ch)) {
11281                         /* break to abort land */
11282                         break;
11283                 }
11284                 switch (ch->chunk_type) {
11285                 case SCTP_PACKET_DROPPED:
11286                 case SCTP_ABORT_ASSOCIATION:
11287                 case SCTP_INITIATION_ACK:
11288                         /**
11289                          * We don't respond with an PKT-DROP to an ABORT
11290                          * or PKT-DROP. We also do not respond to an
11291                          * INIT-ACK, because we can't know if the initiation
11292                          * tag is correct or not.
11293                          */
11294                         sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
11295                         return;
11296                 default:
11297                         break;
11298                 }
11299                 offset += SCTP_SIZE32(chk_length);
11300                 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, offset,
11301                     sizeof(*ch), (uint8_t *) & chunk_buf);
11302         }
11303
11304         if ((len + SCTP_MAX_OVERHEAD + sizeof(struct sctp_pktdrop_chunk)) >
11305             min(stcb->asoc.smallest_mtu, MCLBYTES)) {
11306                 /*
11307                  * only send 1 mtu worth, trim off the excess on the end.
11308                  */
11309                 fullsz = len;
11310                 len = min(stcb->asoc.smallest_mtu, MCLBYTES) - SCTP_MAX_OVERHEAD;
11311                 was_trunc = 1;
11312         }
11313         chk->asoc = &stcb->asoc;
11314         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_DONTWAIT, 1, MT_DATA);
11315         if (chk->data == NULL) {
11316 jump_out:
11317                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
11318                 return;
11319         }
11320         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11321         drp = mtod(chk->data, struct sctp_pktdrop_chunk *);
11322         if (drp == NULL) {
11323                 sctp_m_freem(chk->data);
11324                 chk->data = NULL;
11325                 goto jump_out;
11326         }
11327         chk->book_size = SCTP_SIZE32((chk->send_size + sizeof(struct sctp_pktdrop_chunk) +
11328             sizeof(struct sctphdr) + SCTP_MED_OVERHEAD));
11329         chk->book_size_scale = 0;
11330         if (was_trunc) {
11331                 drp->ch.chunk_flags = SCTP_PACKET_TRUNCATED;
11332                 drp->trunc_len = htons(fullsz);
11333                 /*
11334                  * Len is already adjusted to size minus overhead above take
11335                  * out the pkt_drop chunk itself from it.
11336                  */
11337                 chk->send_size = len - sizeof(struct sctp_pktdrop_chunk);
11338                 len = chk->send_size;
11339         } else {
11340                 /* no truncation needed */
11341                 drp->ch.chunk_flags = 0;
11342                 drp->trunc_len = htons(0);
11343         }
11344         if (bad_crc) {
11345                 drp->ch.chunk_flags |= SCTP_BADCRC;
11346         }
11347         chk->send_size += sizeof(struct sctp_pktdrop_chunk);
11348         SCTP_BUF_LEN(chk->data) = chk->send_size;
11349         chk->sent = SCTP_DATAGRAM_UNSENT;
11350         chk->snd_count = 0;
11351         if (net) {
11352                 /* we should hit here */
11353                 chk->whoTo = net;
11354                 atomic_add_int(&chk->whoTo->ref_count, 1);
11355         } else {
11356                 chk->whoTo = NULL;
11357         }
11358         chk->rec.chunk_id.id = SCTP_PACKET_DROPPED;
11359         chk->rec.chunk_id.can_take_data = 1;
11360         drp->ch.chunk_type = SCTP_PACKET_DROPPED;
11361         drp->ch.chunk_length = htons(chk->send_size);
11362         spc = SCTP_SB_LIMIT_RCV(stcb->sctp_socket);
11363         if (spc < 0) {
11364                 spc = 0;
11365         }
11366         drp->bottle_bw = htonl(spc);
11367         if (asoc->my_rwnd) {
11368                 drp->current_onq = htonl(asoc->size_on_reasm_queue +
11369                     asoc->size_on_all_streams +
11370                     asoc->my_rwnd_control_len +
11371                     stcb->sctp_socket->so_rcv.sb_cc);
11372         } else {
11373                 /*-
11374                  * If my rwnd is 0, possibly from mbuf depletion as well as
11375                  * space used, tell the peer there is NO space aka onq == bw
11376                  */
11377                 drp->current_onq = htonl(spc);
11378         }
11379         drp->reserved = 0;
11380         datap = drp->data;
11381         m_copydata(m, iphlen, len, (caddr_t)datap);
11382         TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
11383         asoc->ctrl_queue_cnt++;
11384 }
11385
11386 void
11387 sctp_send_cwr(struct sctp_tcb *stcb, struct sctp_nets *net, uint32_t high_tsn, uint8_t override)
11388 {
11389         struct sctp_association *asoc;
11390         struct sctp_cwr_chunk *cwr;
11391         struct sctp_tmit_chunk *chk;
11392
11393         asoc = &stcb->asoc;
11394         SCTP_TCB_LOCK_ASSERT(stcb);
11395         if (net == NULL) {
11396                 return;
11397         }
11398         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
11399                 if ((chk->rec.chunk_id.id == SCTP_ECN_CWR) && (net == chk->whoTo)) {
11400                         /*
11401                          * found a previous CWR queued to same destination
11402                          * update it if needed
11403                          */
11404                         uint32_t ctsn;
11405
11406                         cwr = mtod(chk->data, struct sctp_cwr_chunk *);
11407                         ctsn = ntohl(cwr->tsn);
11408                         if (SCTP_TSN_GT(high_tsn, ctsn)) {
11409                                 cwr->tsn = htonl(high_tsn);
11410                         }
11411                         if (override & SCTP_CWR_REDUCE_OVERRIDE) {
11412                                 /* Make sure override is carried */
11413                                 cwr->ch.chunk_flags |= SCTP_CWR_REDUCE_OVERRIDE;
11414                         }
11415                         return;
11416                 }
11417         }
11418         sctp_alloc_a_chunk(stcb, chk);
11419         if (chk == NULL) {
11420                 return;
11421         }
11422         chk->copy_by_ref = 0;
11423         chk->rec.chunk_id.id = SCTP_ECN_CWR;
11424         chk->rec.chunk_id.can_take_data = 1;
11425         chk->asoc = &stcb->asoc;
11426         chk->send_size = sizeof(struct sctp_cwr_chunk);
11427         chk->data = sctp_get_mbuf_for_msg(chk->send_size, 0, M_DONTWAIT, 1, MT_HEADER);
11428         if (chk->data == NULL) {
11429                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
11430                 return;
11431         }
11432         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11433         SCTP_BUF_LEN(chk->data) = chk->send_size;
11434         chk->sent = SCTP_DATAGRAM_UNSENT;
11435         chk->snd_count = 0;
11436         chk->whoTo = net;
11437         atomic_add_int(&chk->whoTo->ref_count, 1);
11438         cwr = mtod(chk->data, struct sctp_cwr_chunk *);
11439         cwr->ch.chunk_type = SCTP_ECN_CWR;
11440         cwr->ch.chunk_flags = override;
11441         cwr->ch.chunk_length = htons(sizeof(struct sctp_cwr_chunk));
11442         cwr->tsn = htonl(high_tsn);
11443         TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
11444         asoc->ctrl_queue_cnt++;
11445 }
11446
11447 void
11448 sctp_add_stream_reset_out(struct sctp_tmit_chunk *chk,
11449     int number_entries, uint16_t * list,
11450     uint32_t seq, uint32_t resp_seq, uint32_t last_sent)
11451 {
11452         int len, old_len, i;
11453         struct sctp_stream_reset_out_request *req_out;
11454         struct sctp_chunkhdr *ch;
11455
11456         ch = mtod(chk->data, struct sctp_chunkhdr *);
11457
11458
11459         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11460
11461         /* get to new offset for the param. */
11462         req_out = (struct sctp_stream_reset_out_request *)((caddr_t)ch + len);
11463         /* now how long will this param be? */
11464         len = (sizeof(struct sctp_stream_reset_out_request) + (sizeof(uint16_t) * number_entries));
11465         req_out->ph.param_type = htons(SCTP_STR_RESET_OUT_REQUEST);
11466         req_out->ph.param_length = htons(len);
11467         req_out->request_seq = htonl(seq);
11468         req_out->response_seq = htonl(resp_seq);
11469         req_out->send_reset_at_tsn = htonl(last_sent);
11470         if (number_entries) {
11471                 for (i = 0; i < number_entries; i++) {
11472                         req_out->list_of_streams[i] = htons(list[i]);
11473                 }
11474         }
11475         if (SCTP_SIZE32(len) > len) {
11476                 /*-
11477                  * Need to worry about the pad we may end up adding to the
11478                  * end. This is easy since the struct is either aligned to 4
11479                  * bytes or 2 bytes off.
11480                  */
11481                 req_out->list_of_streams[number_entries] = 0;
11482         }
11483         /* now fix the chunk length */
11484         ch->chunk_length = htons(len + old_len);
11485         chk->book_size = len + old_len;
11486         chk->book_size_scale = 0;
11487         chk->send_size = SCTP_SIZE32(chk->book_size);
11488         SCTP_BUF_LEN(chk->data) = chk->send_size;
11489         return;
11490 }
11491
11492
11493 void
11494 sctp_add_stream_reset_in(struct sctp_tmit_chunk *chk,
11495     int number_entries, uint16_t * list,
11496     uint32_t seq)
11497 {
11498         int len, old_len, i;
11499         struct sctp_stream_reset_in_request *req_in;
11500         struct sctp_chunkhdr *ch;
11501
11502         ch = mtod(chk->data, struct sctp_chunkhdr *);
11503
11504
11505         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11506
11507         /* get to new offset for the param. */
11508         req_in = (struct sctp_stream_reset_in_request *)((caddr_t)ch + len);
11509         /* now how long will this param be? */
11510         len = (sizeof(struct sctp_stream_reset_in_request) + (sizeof(uint16_t) * number_entries));
11511         req_in->ph.param_type = htons(SCTP_STR_RESET_IN_REQUEST);
11512         req_in->ph.param_length = htons(len);
11513         req_in->request_seq = htonl(seq);
11514         if (number_entries) {
11515                 for (i = 0; i < number_entries; i++) {
11516                         req_in->list_of_streams[i] = htons(list[i]);
11517                 }
11518         }
11519         if (SCTP_SIZE32(len) > len) {
11520                 /*-
11521                  * Need to worry about the pad we may end up adding to the
11522                  * end. This is easy since the struct is either aligned to 4
11523                  * bytes or 2 bytes off.
11524                  */
11525                 req_in->list_of_streams[number_entries] = 0;
11526         }
11527         /* now fix the chunk length */
11528         ch->chunk_length = htons(len + old_len);
11529         chk->book_size = len + old_len;
11530         chk->book_size_scale = 0;
11531         chk->send_size = SCTP_SIZE32(chk->book_size);
11532         SCTP_BUF_LEN(chk->data) = chk->send_size;
11533         return;
11534 }
11535
11536
11537 void
11538 sctp_add_stream_reset_tsn(struct sctp_tmit_chunk *chk,
11539     uint32_t seq)
11540 {
11541         int 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
11547
11548         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11549
11550         /* get to new offset for the param. */
11551         req_tsn = (struct sctp_stream_reset_tsn_request *)((caddr_t)ch + len);
11552         /* now how long will this param be? */
11553         len = sizeof(struct sctp_stream_reset_tsn_request);
11554         req_tsn->ph.param_type = htons(SCTP_STR_RESET_TSN_REQUEST);
11555         req_tsn->ph.param_length = htons(len);
11556         req_tsn->request_seq = htonl(seq);
11557
11558         /* now fix the chunk length */
11559         ch->chunk_length = htons(len + old_len);
11560         chk->send_size = len + old_len;
11561         chk->book_size = SCTP_SIZE32(chk->send_size);
11562         chk->book_size_scale = 0;
11563         SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size);
11564         return;
11565 }
11566
11567 void
11568 sctp_add_stream_reset_result(struct sctp_tmit_chunk *chk,
11569     uint32_t resp_seq, uint32_t result)
11570 {
11571         int len, old_len;
11572         struct sctp_stream_reset_response *resp;
11573         struct sctp_chunkhdr *ch;
11574
11575         ch = mtod(chk->data, struct sctp_chunkhdr *);
11576
11577
11578         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11579
11580         /* get to new offset for the param. */
11581         resp = (struct sctp_stream_reset_response *)((caddr_t)ch + len);
11582         /* now how long will this param be? */
11583         len = sizeof(struct sctp_stream_reset_response);
11584         resp->ph.param_type = htons(SCTP_STR_RESET_RESPONSE);
11585         resp->ph.param_length = htons(len);
11586         resp->response_seq = htonl(resp_seq);
11587         resp->result = ntohl(result);
11588
11589         /* now fix the chunk length */
11590         ch->chunk_length = htons(len + old_len);
11591         chk->book_size = len + old_len;
11592         chk->book_size_scale = 0;
11593         chk->send_size = SCTP_SIZE32(chk->book_size);
11594         SCTP_BUF_LEN(chk->data) = chk->send_size;
11595         return;
11596
11597 }
11598
11599
11600 void
11601 sctp_add_stream_reset_result_tsn(struct sctp_tmit_chunk *chk,
11602     uint32_t resp_seq, uint32_t result,
11603     uint32_t send_una, uint32_t recv_next)
11604 {
11605         int len, old_len;
11606         struct sctp_stream_reset_response_tsn *resp;
11607         struct sctp_chunkhdr *ch;
11608
11609         ch = mtod(chk->data, struct sctp_chunkhdr *);
11610
11611
11612         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11613
11614         /* get to new offset for the param. */
11615         resp = (struct sctp_stream_reset_response_tsn *)((caddr_t)ch + len);
11616         /* now how long will this param be? */
11617         len = sizeof(struct sctp_stream_reset_response_tsn);
11618         resp->ph.param_type = htons(SCTP_STR_RESET_RESPONSE);
11619         resp->ph.param_length = htons(len);
11620         resp->response_seq = htonl(resp_seq);
11621         resp->result = htonl(result);
11622         resp->senders_next_tsn = htonl(send_una);
11623         resp->receivers_next_tsn = htonl(recv_next);
11624
11625         /* now fix the chunk length */
11626         ch->chunk_length = htons(len + old_len);
11627         chk->book_size = len + old_len;
11628         chk->send_size = SCTP_SIZE32(chk->book_size);
11629         chk->book_size_scale = 0;
11630         SCTP_BUF_LEN(chk->data) = chk->send_size;
11631         return;
11632 }
11633
11634 static void
11635 sctp_add_an_out_stream(struct sctp_tmit_chunk *chk,
11636     uint32_t seq,
11637     uint16_t adding)
11638 {
11639         int len, old_len;
11640         struct sctp_chunkhdr *ch;
11641         struct sctp_stream_reset_add_strm *addstr;
11642
11643         ch = mtod(chk->data, struct sctp_chunkhdr *);
11644         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11645
11646         /* get to new offset for the param. */
11647         addstr = (struct sctp_stream_reset_add_strm *)((caddr_t)ch + len);
11648         /* now how long will this param be? */
11649         len = sizeof(struct sctp_stream_reset_add_strm);
11650
11651         /* Fill it out. */
11652         addstr->ph.param_type = htons(SCTP_STR_RESET_ADD_OUT_STREAMS);
11653         addstr->ph.param_length = htons(len);
11654         addstr->request_seq = htonl(seq);
11655         addstr->number_of_streams = htons(adding);
11656         addstr->reserved = 0;
11657
11658         /* now fix the chunk length */
11659         ch->chunk_length = htons(len + old_len);
11660         chk->send_size = len + old_len;
11661         chk->book_size = SCTP_SIZE32(chk->send_size);
11662         chk->book_size_scale = 0;
11663         SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size);
11664         return;
11665 }
11666
11667 static void
11668 sctp_add_an_in_stream(struct sctp_tmit_chunk *chk,
11669     uint32_t seq,
11670     uint16_t adding)
11671 {
11672         int len, old_len;
11673         struct sctp_chunkhdr *ch;
11674         struct sctp_stream_reset_add_strm *addstr;
11675
11676         ch = mtod(chk->data, struct sctp_chunkhdr *);
11677         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11678
11679         /* get to new offset for the param. */
11680         addstr = (struct sctp_stream_reset_add_strm *)((caddr_t)ch + len);
11681         /* now how long will this param be? */
11682         len = sizeof(struct sctp_stream_reset_add_strm);
11683         /* Fill it out. */
11684         addstr->ph.param_type = htons(SCTP_STR_RESET_ADD_IN_STREAMS);
11685         addstr->ph.param_length = htons(len);
11686         addstr->request_seq = htonl(seq);
11687         addstr->number_of_streams = htons(adding);
11688         addstr->reserved = 0;
11689
11690         /* now fix the chunk length */
11691         ch->chunk_length = htons(len + old_len);
11692         chk->send_size = len + old_len;
11693         chk->book_size = SCTP_SIZE32(chk->send_size);
11694         chk->book_size_scale = 0;
11695         SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size);
11696         return;
11697 }
11698
11699
11700
11701 int
11702 sctp_send_str_reset_req(struct sctp_tcb *stcb,
11703     int number_entries, uint16_t * list,
11704     uint8_t send_out_req,
11705     uint8_t send_in_req,
11706     uint8_t send_tsn_req,
11707     uint8_t add_stream,
11708     uint16_t adding_o,
11709     uint16_t adding_i, uint8_t peer_asked
11710 )
11711 {
11712
11713         struct sctp_association *asoc;
11714         struct sctp_tmit_chunk *chk;
11715         struct sctp_chunkhdr *ch;
11716         uint32_t seq;
11717
11718         asoc = &stcb->asoc;
11719         if (asoc->stream_reset_outstanding) {
11720                 /*-
11721                  * Already one pending, must get ACK back to clear the flag.
11722                  */
11723                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EBUSY);
11724                 return (EBUSY);
11725         }
11726         if ((send_out_req == 0) && (send_in_req == 0) && (send_tsn_req == 0) &&
11727             (add_stream == 0)) {
11728                 /* nothing to do */
11729                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
11730                 return (EINVAL);
11731         }
11732         if (send_tsn_req && (send_out_req || send_in_req)) {
11733                 /* error, can't do that */
11734                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
11735                 return (EINVAL);
11736         }
11737         sctp_alloc_a_chunk(stcb, chk);
11738         if (chk == NULL) {
11739                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
11740                 return (ENOMEM);
11741         }
11742         chk->copy_by_ref = 0;
11743         chk->rec.chunk_id.id = SCTP_STREAM_RESET;
11744         chk->rec.chunk_id.can_take_data = 0;
11745         chk->asoc = &stcb->asoc;
11746         chk->book_size = sizeof(struct sctp_chunkhdr);
11747         chk->send_size = SCTP_SIZE32(chk->book_size);
11748         chk->book_size_scale = 0;
11749
11750         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_DONTWAIT, 1, MT_DATA);
11751         if (chk->data == NULL) {
11752                 sctp_free_a_chunk(stcb, chk, SCTP_SO_LOCKED);
11753                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
11754                 return (ENOMEM);
11755         }
11756         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11757
11758         /* setup chunk parameters */
11759         chk->sent = SCTP_DATAGRAM_UNSENT;
11760         chk->snd_count = 0;
11761         if (stcb->asoc.alternate) {
11762                 chk->whoTo = stcb->asoc.alternate;
11763         } else {
11764                 chk->whoTo = stcb->asoc.primary_destination;
11765         }
11766         atomic_add_int(&chk->whoTo->ref_count, 1);
11767         ch = mtod(chk->data, struct sctp_chunkhdr *);
11768         ch->chunk_type = SCTP_STREAM_RESET;
11769         ch->chunk_flags = 0;
11770         ch->chunk_length = htons(chk->book_size);
11771         SCTP_BUF_LEN(chk->data) = chk->send_size;
11772
11773         seq = stcb->asoc.str_reset_seq_out;
11774         if (send_out_req) {
11775                 sctp_add_stream_reset_out(chk, number_entries, list,
11776                     seq, (stcb->asoc.str_reset_seq_in - 1), (stcb->asoc.sending_seq - 1));
11777                 asoc->stream_reset_out_is_outstanding = 1;
11778                 seq++;
11779                 asoc->stream_reset_outstanding++;
11780         }
11781         if ((add_stream & 1) &&
11782             ((stcb->asoc.strm_realoutsize - stcb->asoc.streamoutcnt) < adding_o)) {
11783                 /* Need to allocate more */
11784                 struct sctp_stream_out *oldstream;
11785                 struct sctp_stream_queue_pending *sp, *nsp;
11786                 int i;
11787
11788                 oldstream = stcb->asoc.strmout;
11789                 /* get some more */
11790                 SCTP_MALLOC(stcb->asoc.strmout, struct sctp_stream_out *,
11791                     ((stcb->asoc.streamoutcnt + adding_o) * sizeof(struct sctp_stream_out)),
11792                     SCTP_M_STRMO);
11793                 if (stcb->asoc.strmout == NULL) {
11794                         uint8_t x;
11795
11796                         stcb->asoc.strmout = oldstream;
11797                         /* Turn off the bit */
11798                         x = add_stream & 0xfe;
11799                         add_stream = x;
11800                         goto skip_stuff;
11801                 }
11802                 /*
11803                  * Ok now we proceed with copying the old out stuff and
11804                  * initializing the new stuff.
11805                  */
11806                 SCTP_TCB_SEND_LOCK(stcb);
11807                 stcb->asoc.ss_functions.sctp_ss_clear(stcb, &stcb->asoc, 0, 1);
11808                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
11809                         TAILQ_INIT(&stcb->asoc.strmout[i].outqueue);
11810                         stcb->asoc.strmout[i].next_sequence_sent = oldstream[i].next_sequence_sent;
11811                         stcb->asoc.strmout[i].last_msg_incomplete = oldstream[i].last_msg_incomplete;
11812                         stcb->asoc.strmout[i].stream_no = i;
11813                         stcb->asoc.ss_functions.sctp_ss_init_stream(&stcb->asoc.strmout[i], &oldstream[i]);
11814                         /* now anything on those queues? */
11815                         TAILQ_FOREACH_SAFE(sp, &oldstream[i].outqueue, next, nsp) {
11816                                 TAILQ_REMOVE(&oldstream[i].outqueue, sp, next);
11817                                 TAILQ_INSERT_TAIL(&stcb->asoc.strmout[i].outqueue, sp, next);
11818                         }
11819                         /* Now move assoc pointers too */
11820                         if (stcb->asoc.last_out_stream == &oldstream[i]) {
11821                                 stcb->asoc.last_out_stream = &stcb->asoc.strmout[i];
11822                         }
11823                         if (stcb->asoc.locked_on_sending == &oldstream[i]) {
11824                                 stcb->asoc.locked_on_sending = &stcb->asoc.strmout[i];
11825                         }
11826                 }
11827                 /* now the new streams */
11828                 stcb->asoc.ss_functions.sctp_ss_init(stcb, &stcb->asoc, 1);
11829                 for (i = stcb->asoc.streamoutcnt; i < (stcb->asoc.streamoutcnt + adding_o); i++) {
11830                         stcb->asoc.strmout[i].next_sequence_sent = 0x0;
11831                         TAILQ_INIT(&stcb->asoc.strmout[i].outqueue);
11832                         stcb->asoc.strmout[i].stream_no = i;
11833                         stcb->asoc.strmout[i].last_msg_incomplete = 0;
11834                         stcb->asoc.ss_functions.sctp_ss_init_stream(&stcb->asoc.strmout[i], NULL);
11835                 }
11836                 stcb->asoc.strm_realoutsize = stcb->asoc.streamoutcnt + adding_o;
11837                 SCTP_FREE(oldstream, SCTP_M_STRMO);
11838                 SCTP_TCB_SEND_UNLOCK(stcb);
11839         }
11840 skip_stuff:
11841         if ((add_stream & 1) && (adding_o > 0)) {
11842                 asoc->strm_pending_add_size = adding_o;
11843                 asoc->peer_req_out = peer_asked;
11844                 sctp_add_an_out_stream(chk, seq, adding_o);
11845                 seq++;
11846                 asoc->stream_reset_outstanding++;
11847         }
11848         if ((add_stream & 2) && (adding_i > 0)) {
11849                 sctp_add_an_in_stream(chk, seq, adding_i);
11850                 seq++;
11851                 asoc->stream_reset_outstanding++;
11852         }
11853         if (send_in_req) {
11854                 sctp_add_stream_reset_in(chk, number_entries, list, seq);
11855                 seq++;
11856                 asoc->stream_reset_outstanding++;
11857         }
11858         if (send_tsn_req) {
11859                 sctp_add_stream_reset_tsn(chk, seq);
11860                 asoc->stream_reset_outstanding++;
11861         }
11862         asoc->str_reset = chk;
11863         /* insert the chunk for sending */
11864         TAILQ_INSERT_TAIL(&asoc->control_send_queue,
11865             chk,
11866             sctp_next);
11867         asoc->ctrl_queue_cnt++;
11868         sctp_timer_start(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb, chk->whoTo);
11869         return (0);
11870 }
11871
11872 void
11873 sctp_send_abort(struct mbuf *m, int iphlen, struct sockaddr *src, struct sockaddr *dst,
11874     struct sctphdr *sh, uint32_t vtag, struct mbuf *cause,
11875     uint8_t use_mflowid, uint32_t mflowid,
11876     uint32_t vrf_id, uint16_t port)
11877 {
11878         /* Don't respond to an ABORT with an ABORT. */
11879         if (sctp_is_there_an_abort_here(m, iphlen, &vtag)) {
11880                 if (cause)
11881                         sctp_m_freem(cause);
11882                 return;
11883         }
11884         sctp_send_resp_msg(src, dst, sh, vtag, SCTP_ABORT_ASSOCIATION, cause,
11885             use_mflowid, mflowid,
11886             vrf_id, port);
11887         return;
11888 }
11889
11890 void
11891 sctp_send_operr_to(struct sockaddr *src, struct sockaddr *dst,
11892     struct sctphdr *sh, uint32_t vtag, struct mbuf *cause,
11893     uint8_t use_mflowid, uint32_t mflowid,
11894     uint32_t vrf_id, uint16_t port)
11895 {
11896         sctp_send_resp_msg(src, dst, sh, vtag, SCTP_OPERATION_ERROR, cause,
11897             use_mflowid, mflowid,
11898             vrf_id, port);
11899         return;
11900 }
11901
11902 static struct mbuf *
11903 sctp_copy_resume(struct uio *uio,
11904     int max_send_len,
11905     int user_marks_eor,
11906     int *error,
11907     uint32_t * sndout,
11908     struct mbuf **new_tail)
11909 {
11910         struct mbuf *m;
11911
11912         m = m_uiotombuf(uio, M_WAITOK, max_send_len, 0,
11913             (M_PKTHDR | (user_marks_eor ? M_EOR : 0)));
11914         if (m == NULL) {
11915                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
11916                 *error = ENOMEM;
11917         } else {
11918                 *sndout = m_length(m, NULL);
11919                 *new_tail = m_last(m);
11920         }
11921         return (m);
11922 }
11923
11924 static int
11925 sctp_copy_one(struct sctp_stream_queue_pending *sp,
11926     struct uio *uio,
11927     int resv_upfront)
11928 {
11929         int left;
11930
11931         left = sp->length;
11932         sp->data = m_uiotombuf(uio, M_WAITOK, sp->length,
11933             resv_upfront, 0);
11934         if (sp->data == NULL) {
11935                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
11936                 return (ENOMEM);
11937         }
11938         sp->tail_mbuf = m_last(sp->data);
11939         return (0);
11940 }
11941
11942
11943
11944 static struct sctp_stream_queue_pending *
11945 sctp_copy_it_in(struct sctp_tcb *stcb,
11946     struct sctp_association *asoc,
11947     struct sctp_sndrcvinfo *srcv,
11948     struct uio *uio,
11949     struct sctp_nets *net,
11950     int max_send_len,
11951     int user_marks_eor,
11952     int *error)
11953 {
11954         /*-
11955          * This routine must be very careful in its work. Protocol
11956          * processing is up and running so care must be taken to spl...()
11957          * when you need to do something that may effect the stcb/asoc. The
11958          * sb is locked however. When data is copied the protocol processing
11959          * should be enabled since this is a slower operation...
11960          */
11961         struct sctp_stream_queue_pending *sp = NULL;
11962         int resv_in_first;
11963
11964         *error = 0;
11965         /* Now can we send this? */
11966         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_SENT) ||
11967             (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) ||
11968             (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED) ||
11969             (asoc->state & SCTP_STATE_SHUTDOWN_PENDING)) {
11970                 /* got data while shutting down */
11971                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
11972                 *error = ECONNRESET;
11973                 goto out_now;
11974         }
11975         sctp_alloc_a_strmoq(stcb, sp);
11976         if (sp == NULL) {
11977                 SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
11978                 *error = ENOMEM;
11979                 goto out_now;
11980         }
11981         sp->act_flags = 0;
11982         sp->sender_all_done = 0;
11983         sp->sinfo_flags = srcv->sinfo_flags;
11984         sp->timetolive = srcv->sinfo_timetolive;
11985         sp->ppid = srcv->sinfo_ppid;
11986         sp->context = srcv->sinfo_context;
11987         sp->strseq = 0;
11988         (void)SCTP_GETTIME_TIMEVAL(&sp->ts);
11989
11990         sp->stream = srcv->sinfo_stream;
11991         sp->length = min(uio->uio_resid, max_send_len);
11992         if ((sp->length == (uint32_t) uio->uio_resid) &&
11993             ((user_marks_eor == 0) ||
11994             (srcv->sinfo_flags & SCTP_EOF) ||
11995             (user_marks_eor && (srcv->sinfo_flags & SCTP_EOR)))) {
11996                 sp->msg_is_complete = 1;
11997         } else {
11998                 sp->msg_is_complete = 0;
11999         }
12000         sp->sender_all_done = 0;
12001         sp->some_taken = 0;
12002         sp->put_last_out = 0;
12003         resv_in_first = sizeof(struct sctp_data_chunk);
12004         sp->data = sp->tail_mbuf = NULL;
12005         if (sp->length == 0) {
12006                 *error = 0;
12007                 goto skip_copy;
12008         }
12009         if (srcv->sinfo_keynumber_valid) {
12010                 sp->auth_keyid = srcv->sinfo_keynumber;
12011         } else {
12012                 sp->auth_keyid = stcb->asoc.authinfo.active_keyid;
12013         }
12014         if (sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks)) {
12015                 sctp_auth_key_acquire(stcb, sp->auth_keyid);
12016                 sp->holds_key_ref = 1;
12017         }
12018         *error = sctp_copy_one(sp, uio, resv_in_first);
12019 skip_copy:
12020         if (*error) {
12021                 sctp_free_a_strmoq(stcb, sp, SCTP_SO_LOCKED);
12022                 sp = NULL;
12023         } else {
12024                 if (sp->sinfo_flags & SCTP_ADDR_OVER) {
12025                         sp->net = net;
12026                         atomic_add_int(&sp->net->ref_count, 1);
12027                 } else {
12028                         sp->net = NULL;
12029                 }
12030                 sctp_set_prsctp_policy(sp);
12031         }
12032 out_now:
12033         return (sp);
12034 }
12035
12036
12037 int
12038 sctp_sosend(struct socket *so,
12039     struct sockaddr *addr,
12040     struct uio *uio,
12041     struct mbuf *top,
12042     struct mbuf *control,
12043     int flags,
12044     struct thread *p
12045 )
12046 {
12047         int error, use_sndinfo = 0;
12048         struct sctp_sndrcvinfo sndrcvninfo;
12049         struct sockaddr *addr_to_use;
12050
12051 #if defined(INET) && defined(INET6)
12052         struct sockaddr_in sin;
12053
12054 #endif
12055
12056         if (control) {
12057                 /* process cmsg snd/rcv info (maybe a assoc-id) */
12058                 if (sctp_find_cmsg(SCTP_SNDRCV, (void *)&sndrcvninfo, control,
12059                     sizeof(sndrcvninfo))) {
12060                         /* got one */
12061                         use_sndinfo = 1;
12062                 }
12063         }
12064         addr_to_use = addr;
12065 #if defined(INET) && defined(INET6)
12066         if ((addr) && (addr->sa_family == AF_INET6)) {
12067                 struct sockaddr_in6 *sin6;
12068
12069                 sin6 = (struct sockaddr_in6 *)addr;
12070                 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
12071                         in6_sin6_2_sin(&sin, sin6);
12072                         addr_to_use = (struct sockaddr *)&sin;
12073                 }
12074         }
12075 #endif
12076         error = sctp_lower_sosend(so, addr_to_use, uio, top,
12077             control,
12078             flags,
12079             use_sndinfo ? &sndrcvninfo : NULL
12080             ,p
12081             );
12082         return (error);
12083 }
12084
12085
12086 int
12087 sctp_lower_sosend(struct socket *so,
12088     struct sockaddr *addr,
12089     struct uio *uio,
12090     struct mbuf *i_pak,
12091     struct mbuf *control,
12092     int flags,
12093     struct sctp_sndrcvinfo *srcv
12094     ,
12095     struct thread *p
12096 )
12097 {
12098         unsigned int sndlen = 0, max_len;
12099         int error, len;
12100         struct mbuf *top = NULL;
12101         int queue_only = 0, queue_only_for_init = 0;
12102         int free_cnt_applied = 0;
12103         int un_sent;
12104         int now_filled = 0;
12105         unsigned int inqueue_bytes = 0;
12106         struct sctp_block_entry be;
12107         struct sctp_inpcb *inp;
12108         struct sctp_tcb *stcb = NULL;
12109         struct timeval now;
12110         struct sctp_nets *net;
12111         struct sctp_association *asoc;
12112         struct sctp_inpcb *t_inp;
12113         int user_marks_eor;
12114         int create_lock_applied = 0;
12115         int nagle_applies = 0;
12116         int some_on_control = 0;
12117         int got_all_of_the_send = 0;
12118         int hold_tcblock = 0;
12119         int non_blocking = 0;
12120         uint32_t local_add_more, local_soresv = 0;
12121         uint16_t port;
12122         uint16_t sinfo_flags;
12123         sctp_assoc_t sinfo_assoc_id;
12124
12125         error = 0;
12126         net = NULL;
12127         stcb = NULL;
12128         asoc = NULL;
12129
12130         t_inp = inp = (struct sctp_inpcb *)so->so_pcb;
12131         if (inp == NULL) {
12132                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12133                 error = EINVAL;
12134                 if (i_pak) {
12135                         SCTP_RELEASE_PKT(i_pak);
12136                 }
12137                 return (error);
12138         }
12139         if ((uio == NULL) && (i_pak == NULL)) {
12140                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12141                 return (EINVAL);
12142         }
12143         user_marks_eor = sctp_is_feature_on(inp, SCTP_PCB_FLAGS_EXPLICIT_EOR);
12144         atomic_add_int(&inp->total_sends, 1);
12145         if (uio) {
12146                 if (uio->uio_resid < 0) {
12147                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12148                         return (EINVAL);
12149                 }
12150                 sndlen = uio->uio_resid;
12151         } else {
12152                 top = SCTP_HEADER_TO_CHAIN(i_pak);
12153                 sndlen = SCTP_HEADER_LEN(i_pak);
12154         }
12155         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Send called addr:%p send length %d\n",
12156             addr,
12157             sndlen);
12158         if ((inp->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) &&
12159             (inp->sctp_socket->so_qlimit)) {
12160                 /* The listener can NOT send */
12161                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOTCONN);
12162                 error = ENOTCONN;
12163                 goto out_unlocked;
12164         }
12165         /**
12166          * Pre-screen address, if one is given the sin-len
12167          * must be set correctly!
12168          */
12169         if (addr) {
12170                 union sctp_sockstore *raddr = (union sctp_sockstore *)addr;
12171
12172                 switch (raddr->sa.sa_family) {
12173 #if defined(INET)
12174                 case AF_INET:
12175                         if (raddr->sin.sin_len != sizeof(struct sockaddr_in)) {
12176                                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12177                                 error = EINVAL;
12178                                 goto out_unlocked;
12179                         }
12180                         port = raddr->sin.sin_port;
12181                         break;
12182 #endif
12183 #if defined(INET6)
12184                 case AF_INET6:
12185                         if (raddr->sin6.sin6_len != sizeof(struct sockaddr_in6)) {
12186                                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12187                                 error = EINVAL;
12188                                 goto out_unlocked;
12189                         }
12190                         port = raddr->sin6.sin6_port;
12191                         break;
12192 #endif
12193                 default:
12194                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EAFNOSUPPORT);
12195                         error = EAFNOSUPPORT;
12196                         goto out_unlocked;
12197                 }
12198         } else
12199                 port = 0;
12200
12201         if (srcv) {
12202                 sinfo_flags = srcv->sinfo_flags;
12203                 sinfo_assoc_id = srcv->sinfo_assoc_id;
12204                 if (INVALID_SINFO_FLAG(sinfo_flags) ||
12205                     PR_SCTP_INVALID_POLICY(sinfo_flags)) {
12206                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12207                         error = EINVAL;
12208                         goto out_unlocked;
12209                 }
12210                 if (srcv->sinfo_flags)
12211                         SCTP_STAT_INCR(sctps_sends_with_flags);
12212         } else {
12213                 sinfo_flags = inp->def_send.sinfo_flags;
12214                 sinfo_assoc_id = inp->def_send.sinfo_assoc_id;
12215         }
12216         if (sinfo_flags & SCTP_SENDALL) {
12217                 /* its a sendall */
12218                 error = sctp_sendall(inp, uio, top, srcv);
12219                 top = NULL;
12220                 goto out_unlocked;
12221         }
12222         if ((sinfo_flags & SCTP_ADDR_OVER) && (addr == NULL)) {
12223                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12224                 error = EINVAL;
12225                 goto out_unlocked;
12226         }
12227         /* now we must find the assoc */
12228         if ((inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) ||
12229             (inp->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) {
12230                 SCTP_INP_RLOCK(inp);
12231                 stcb = LIST_FIRST(&inp->sctp_asoc_list);
12232                 if (stcb) {
12233                         SCTP_TCB_LOCK(stcb);
12234                         hold_tcblock = 1;
12235                 }
12236                 SCTP_INP_RUNLOCK(inp);
12237         } else if (sinfo_assoc_id) {
12238                 stcb = sctp_findassociation_ep_asocid(inp, sinfo_assoc_id, 0);
12239         } else if (addr) {
12240                 /*-
12241                  * Since we did not use findep we must
12242                  * increment it, and if we don't find a tcb
12243                  * decrement it.
12244                  */
12245                 SCTP_INP_WLOCK(inp);
12246                 SCTP_INP_INCR_REF(inp);
12247                 SCTP_INP_WUNLOCK(inp);
12248                 stcb = sctp_findassociation_ep_addr(&t_inp, addr, &net, NULL, NULL);
12249                 if (stcb == NULL) {
12250                         SCTP_INP_WLOCK(inp);
12251                         SCTP_INP_DECR_REF(inp);
12252                         SCTP_INP_WUNLOCK(inp);
12253                 } else {
12254                         hold_tcblock = 1;
12255                 }
12256         }
12257         if ((stcb == NULL) && (addr)) {
12258                 /* Possible implicit send? */
12259                 SCTP_ASOC_CREATE_LOCK(inp);
12260                 create_lock_applied = 1;
12261                 if ((inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) ||
12262                     (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE)) {
12263                         /* Should I really unlock ? */
12264                         SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12265                         error = EINVAL;
12266                         goto out_unlocked;
12267
12268                 }
12269                 if (((inp->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) == 0) &&
12270                     (addr->sa_family == AF_INET6)) {
12271                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12272                         error = EINVAL;
12273                         goto out_unlocked;
12274                 }
12275                 SCTP_INP_WLOCK(inp);
12276                 SCTP_INP_INCR_REF(inp);
12277                 SCTP_INP_WUNLOCK(inp);
12278                 /* With the lock applied look again */
12279                 stcb = sctp_findassociation_ep_addr(&t_inp, addr, &net, NULL, NULL);
12280                 if ((stcb == NULL) && (control != NULL) && (port > 0)) {
12281                         stcb = sctp_findassociation_cmsgs(&t_inp, port, control, &net, &error);
12282                 }
12283                 if (stcb == NULL) {
12284                         SCTP_INP_WLOCK(inp);
12285                         SCTP_INP_DECR_REF(inp);
12286                         SCTP_INP_WUNLOCK(inp);
12287                 } else {
12288                         hold_tcblock = 1;
12289                 }
12290                 if (error) {
12291                         goto out_unlocked;
12292                 }
12293                 if (t_inp != inp) {
12294                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOTCONN);
12295                         error = ENOTCONN;
12296                         goto out_unlocked;
12297                 }
12298         }
12299         if (stcb == NULL) {
12300                 if (addr == NULL) {
12301                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOENT);
12302                         error = ENOENT;
12303                         goto out_unlocked;
12304                 } else {
12305                         /* We must go ahead and start the INIT process */
12306                         uint32_t vrf_id;
12307
12308                         if ((sinfo_flags & SCTP_ABORT) ||
12309                             ((sinfo_flags & SCTP_EOF) && (sndlen == 0))) {
12310                                 /*-
12311                                  * User asks to abort a non-existant assoc,
12312                                  * or EOF a non-existant assoc with no data
12313                                  */
12314                                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOENT);
12315                                 error = ENOENT;
12316                                 goto out_unlocked;
12317                         }
12318                         /* get an asoc/stcb struct */
12319                         vrf_id = inp->def_vrf_id;
12320 #ifdef INVARIANTS
12321                         if (create_lock_applied == 0) {
12322                                 panic("Error, should hold create lock and I don't?");
12323                         }
12324 #endif
12325                         stcb = sctp_aloc_assoc(inp, addr, &error, 0, vrf_id,
12326                             p
12327                             );
12328                         if (stcb == NULL) {
12329                                 /* Error is setup for us in the call */
12330                                 goto out_unlocked;
12331                         }
12332                         if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) {
12333                                 stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED;
12334                                 /*
12335                                  * Set the connected flag so we can queue
12336                                  * data
12337                                  */
12338                                 soisconnecting(so);
12339                         }
12340                         hold_tcblock = 1;
12341                         if (create_lock_applied) {
12342                                 SCTP_ASOC_CREATE_UNLOCK(inp);
12343                                 create_lock_applied = 0;
12344                         } else {
12345                                 SCTP_PRINTF("Huh-3? create lock should have been on??\n");
12346                         }
12347                         /*
12348                          * Turn on queue only flag to prevent data from
12349                          * being sent
12350                          */
12351                         queue_only = 1;
12352                         asoc = &stcb->asoc;
12353                         SCTP_SET_STATE(asoc, SCTP_STATE_COOKIE_WAIT);
12354                         (void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered);
12355
12356                         /* initialize authentication params for the assoc */
12357                         sctp_initialize_auth_params(inp, stcb);
12358
12359                         if (control) {
12360                                 if (sctp_process_cmsgs_for_init(stcb, control, &error)) {
12361                                         sctp_free_assoc(inp, stcb, SCTP_PCBFREE_FORCE, SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_7);
12362                                         hold_tcblock = 0;
12363                                         stcb = NULL;
12364                                         goto out_unlocked;
12365                                 }
12366                         }
12367                         /* out with the INIT */
12368                         queue_only_for_init = 1;
12369                         /*-
12370                          * we may want to dig in after this call and adjust the MTU
12371                          * value. It defaulted to 1500 (constant) but the ro
12372                          * structure may now have an update and thus we may need to
12373                          * change it BEFORE we append the message.
12374                          */
12375                 }
12376         } else
12377                 asoc = &stcb->asoc;
12378         if (srcv == NULL)
12379                 srcv = (struct sctp_sndrcvinfo *)&asoc->def_send;
12380         if (srcv->sinfo_flags & SCTP_ADDR_OVER) {
12381                 if (addr)
12382                         net = sctp_findnet(stcb, addr);
12383                 else
12384                         net = NULL;
12385                 if ((net == NULL) ||
12386                     ((port != 0) && (port != stcb->rport))) {
12387                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12388                         error = EINVAL;
12389                         goto out_unlocked;
12390                 }
12391         } else {
12392                 if (stcb->asoc.alternate) {
12393                         net = stcb->asoc.alternate;
12394                 } else {
12395                         net = stcb->asoc.primary_destination;
12396                 }
12397         }
12398         atomic_add_int(&stcb->total_sends, 1);
12399         /* Keep the stcb from being freed under our feet */
12400         atomic_add_int(&asoc->refcnt, 1);
12401         free_cnt_applied = 1;
12402
12403         if (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_NO_FRAGMENT)) {
12404                 if (sndlen > asoc->smallest_mtu) {
12405                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EMSGSIZE);
12406                         error = EMSGSIZE;
12407                         goto out_unlocked;
12408                 }
12409         }
12410         if (SCTP_SO_IS_NBIO(so)
12411             || (flags & MSG_NBIO)
12412             ) {
12413                 non_blocking = 1;
12414         }
12415         /* would we block? */
12416         if (non_blocking) {
12417                 if (hold_tcblock == 0) {
12418                         SCTP_TCB_LOCK(stcb);
12419                         hold_tcblock = 1;
12420                 }
12421                 inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
12422                 if ((SCTP_SB_LIMIT_SND(so) < (sndlen + inqueue_bytes + stcb->asoc.sb_send_resv)) ||
12423                     (stcb->asoc.chunks_on_out_queue >= SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue))) {
12424                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EWOULDBLOCK);
12425                         if (sndlen > SCTP_SB_LIMIT_SND(so))
12426                                 error = EMSGSIZE;
12427                         else
12428                                 error = EWOULDBLOCK;
12429                         goto out_unlocked;
12430                 }
12431                 stcb->asoc.sb_send_resv += sndlen;
12432                 SCTP_TCB_UNLOCK(stcb);
12433                 hold_tcblock = 0;
12434         } else {
12435                 atomic_add_int(&stcb->asoc.sb_send_resv, sndlen);
12436         }
12437         local_soresv = sndlen;
12438         if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
12439                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
12440                 error = ECONNRESET;
12441                 goto out_unlocked;
12442         }
12443         if (create_lock_applied) {
12444                 SCTP_ASOC_CREATE_UNLOCK(inp);
12445                 create_lock_applied = 0;
12446         }
12447         if (asoc->stream_reset_outstanding) {
12448                 /*
12449                  * Can't queue any data while stream reset is underway.
12450                  */
12451                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EAGAIN);
12452                 error = EAGAIN;
12453                 goto out_unlocked;
12454         }
12455         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) ||
12456             (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)) {
12457                 queue_only = 1;
12458         }
12459         /* we are now done with all control */
12460         if (control) {
12461                 sctp_m_freem(control);
12462                 control = NULL;
12463         }
12464         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_SENT) ||
12465             (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED) ||
12466             (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) ||
12467             (asoc->state & SCTP_STATE_SHUTDOWN_PENDING)) {
12468                 if (srcv->sinfo_flags & SCTP_ABORT) {
12469                         ;
12470                 } else {
12471                         SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
12472                         error = ECONNRESET;
12473                         goto out_unlocked;
12474                 }
12475         }
12476         /* Ok, we will attempt a msgsnd :> */
12477         if (p) {
12478                 p->td_ru.ru_msgsnd++;
12479         }
12480         /* Are we aborting? */
12481         if (srcv->sinfo_flags & SCTP_ABORT) {
12482                 struct mbuf *mm;
12483                 int tot_demand, tot_out = 0, max_out;
12484
12485                 SCTP_STAT_INCR(sctps_sends_with_abort);
12486                 if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) ||
12487                     (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)) {
12488                         /* It has to be up before we abort */
12489                         /* how big is the user initiated abort? */
12490                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12491                         error = EINVAL;
12492                         goto out;
12493                 }
12494                 if (hold_tcblock) {
12495                         SCTP_TCB_UNLOCK(stcb);
12496                         hold_tcblock = 0;
12497                 }
12498                 if (top) {
12499                         struct mbuf *cntm = NULL;
12500
12501                         mm = sctp_get_mbuf_for_msg(sizeof(struct sctp_paramhdr), 0, M_WAIT, 1, MT_DATA);
12502                         if (sndlen != 0) {
12503                                 for (cntm = top; cntm; cntm = SCTP_BUF_NEXT(cntm)) {
12504                                         tot_out += SCTP_BUF_LEN(cntm);
12505                                 }
12506                         }
12507                 } else {
12508                         /* Must fit in a MTU */
12509                         tot_out = sndlen;
12510                         tot_demand = (tot_out + sizeof(struct sctp_paramhdr));
12511                         if (tot_demand > SCTP_DEFAULT_ADD_MORE) {
12512                                 /* To big */
12513                                 SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EMSGSIZE);
12514                                 error = EMSGSIZE;
12515                                 goto out;
12516                         }
12517                         mm = sctp_get_mbuf_for_msg(tot_demand, 0, M_WAIT, 1, MT_DATA);
12518                 }
12519                 if (mm == NULL) {
12520                         SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12521                         error = ENOMEM;
12522                         goto out;
12523                 }
12524                 max_out = asoc->smallest_mtu - sizeof(struct sctp_paramhdr);
12525                 max_out -= sizeof(struct sctp_abort_msg);
12526                 if (tot_out > max_out) {
12527                         tot_out = max_out;
12528                 }
12529                 if (mm) {
12530                         struct sctp_paramhdr *ph;
12531
12532                         /* now move forward the data pointer */
12533                         ph = mtod(mm, struct sctp_paramhdr *);
12534                         ph->param_type = htons(SCTP_CAUSE_USER_INITIATED_ABT);
12535                         ph->param_length = htons((sizeof(struct sctp_paramhdr) + tot_out));
12536                         ph++;
12537                         SCTP_BUF_LEN(mm) = tot_out + sizeof(struct sctp_paramhdr);
12538                         if (top == NULL) {
12539                                 error = uiomove((caddr_t)ph, (int)tot_out, uio);
12540                                 if (error) {
12541                                         /*-
12542                                          * Here if we can't get his data we
12543                                          * still abort we just don't get to
12544                                          * send the users note :-0
12545                                          */
12546                                         sctp_m_freem(mm);
12547                                         mm = NULL;
12548                                 }
12549                         } else {
12550                                 if (sndlen != 0) {
12551                                         SCTP_BUF_NEXT(mm) = top;
12552                                 }
12553                         }
12554                 }
12555                 if (hold_tcblock == 0) {
12556                         SCTP_TCB_LOCK(stcb);
12557                 }
12558                 atomic_add_int(&stcb->asoc.refcnt, -1);
12559                 free_cnt_applied = 0;
12560                 /* release this lock, otherwise we hang on ourselves */
12561                 sctp_abort_an_association(stcb->sctp_ep, stcb, mm, SCTP_SO_LOCKED);
12562                 /* now relock the stcb so everything is sane */
12563                 hold_tcblock = 0;
12564                 stcb = NULL;
12565                 /*
12566                  * In this case top is already chained to mm avoid double
12567                  * free, since we free it below if top != NULL and driver
12568                  * would free it after sending the packet out
12569                  */
12570                 if (sndlen != 0) {
12571                         top = NULL;
12572                 }
12573                 goto out_unlocked;
12574         }
12575         /* Calculate the maximum we can send */
12576         inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
12577         if (SCTP_SB_LIMIT_SND(so) > inqueue_bytes) {
12578                 if (non_blocking) {
12579                         /* we already checked for non-blocking above. */
12580                         max_len = sndlen;
12581                 } else {
12582                         max_len = SCTP_SB_LIMIT_SND(so) - inqueue_bytes;
12583                 }
12584         } else {
12585                 max_len = 0;
12586         }
12587         if (hold_tcblock) {
12588                 SCTP_TCB_UNLOCK(stcb);
12589                 hold_tcblock = 0;
12590         }
12591         /* Is the stream no. valid? */
12592         if (srcv->sinfo_stream >= asoc->streamoutcnt) {
12593                 /* Invalid stream number */
12594                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12595                 error = EINVAL;
12596                 goto out_unlocked;
12597         }
12598         if (asoc->strmout == NULL) {
12599                 /* huh? software error */
12600                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EFAULT);
12601                 error = EFAULT;
12602                 goto out_unlocked;
12603         }
12604         /* Unless E_EOR mode is on, we must make a send FIT in one call. */
12605         if ((user_marks_eor == 0) &&
12606             (sndlen > SCTP_SB_LIMIT_SND(stcb->sctp_socket))) {
12607                 /* It will NEVER fit */
12608                 SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EMSGSIZE);
12609                 error = EMSGSIZE;
12610                 goto out_unlocked;
12611         }
12612         if ((uio == NULL) && user_marks_eor) {
12613                 /*-
12614                  * We do not support eeor mode for
12615                  * sending with mbuf chains (like sendfile).
12616                  */
12617                 SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12618                 error = EINVAL;
12619                 goto out_unlocked;
12620         }
12621         if (user_marks_eor) {
12622                 local_add_more = min(SCTP_SB_LIMIT_SND(so), SCTP_BASE_SYSCTL(sctp_add_more_threshold));
12623         } else {
12624                 /*-
12625                  * For non-eeor the whole message must fit in
12626                  * the socket send buffer.
12627                  */
12628                 local_add_more = sndlen;
12629         }
12630         len = 0;
12631         if (non_blocking) {
12632                 goto skip_preblock;
12633         }
12634         if (((max_len <= local_add_more) &&
12635             (SCTP_SB_LIMIT_SND(so) >= local_add_more)) ||
12636             (max_len == 0) ||
12637             ((stcb->asoc.chunks_on_out_queue + stcb->asoc.stream_queue_cnt) >= SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue))) {
12638                 /* No room right now ! */
12639                 SOCKBUF_LOCK(&so->so_snd);
12640                 inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
12641                 while ((SCTP_SB_LIMIT_SND(so) < (inqueue_bytes + local_add_more)) ||
12642                     ((stcb->asoc.stream_queue_cnt + stcb->asoc.chunks_on_out_queue) >= SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue))) {
12643                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "pre_block limit:%u <(inq:%d + %d) || (%d+%d > %d)\n",
12644                             (unsigned int)SCTP_SB_LIMIT_SND(so),
12645                             inqueue_bytes,
12646                             local_add_more,
12647                             stcb->asoc.stream_queue_cnt,
12648                             stcb->asoc.chunks_on_out_queue,
12649                             SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue));
12650                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
12651                                 sctp_log_block(SCTP_BLOCK_LOG_INTO_BLKA, asoc, sndlen);
12652                         }
12653                         be.error = 0;
12654                         stcb->block_entry = &be;
12655                         error = sbwait(&so->so_snd);
12656                         stcb->block_entry = NULL;
12657                         if (error || so->so_error || be.error) {
12658                                 if (error == 0) {
12659                                         if (so->so_error)
12660                                                 error = so->so_error;
12661                                         if (be.error) {
12662                                                 error = be.error;
12663                                         }
12664                                 }
12665                                 SOCKBUF_UNLOCK(&so->so_snd);
12666                                 goto out_unlocked;
12667                         }
12668                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
12669                                 sctp_log_block(SCTP_BLOCK_LOG_OUTOF_BLK,
12670                                     asoc, stcb->asoc.total_output_queue_size);
12671                         }
12672                         if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
12673                                 goto out_unlocked;
12674                         }
12675                         inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
12676                 }
12677                 if (SCTP_SB_LIMIT_SND(so) > inqueue_bytes) {
12678                         max_len = SCTP_SB_LIMIT_SND(so) - inqueue_bytes;
12679                 } else {
12680                         max_len = 0;
12681                 }
12682                 SOCKBUF_UNLOCK(&so->so_snd);
12683         }
12684 skip_preblock:
12685         if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
12686                 goto out_unlocked;
12687         }
12688         /*
12689          * sndlen covers for mbuf case uio_resid covers for the non-mbuf
12690          * case NOTE: uio will be null when top/mbuf is passed
12691          */
12692         if (sndlen == 0) {
12693                 if (srcv->sinfo_flags & SCTP_EOF) {
12694                         got_all_of_the_send = 1;
12695                         goto dataless_eof;
12696                 } else {
12697                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12698                         error = EINVAL;
12699                         goto out;
12700                 }
12701         }
12702         if (top == NULL) {
12703                 struct sctp_stream_queue_pending *sp;
12704                 struct sctp_stream_out *strm;
12705                 uint32_t sndout;
12706
12707                 SCTP_TCB_SEND_LOCK(stcb);
12708                 if ((asoc->stream_locked) &&
12709                     (asoc->stream_locked_on != srcv->sinfo_stream)) {
12710                         SCTP_TCB_SEND_UNLOCK(stcb);
12711                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12712                         error = EINVAL;
12713                         goto out;
12714                 }
12715                 SCTP_TCB_SEND_UNLOCK(stcb);
12716
12717                 strm = &stcb->asoc.strmout[srcv->sinfo_stream];
12718                 if (strm->last_msg_incomplete == 0) {
12719         do_a_copy_in:
12720                         sp = sctp_copy_it_in(stcb, asoc, srcv, uio, net, max_len, user_marks_eor, &error);
12721                         if ((sp == NULL) || (error)) {
12722                                 goto out;
12723                         }
12724                         SCTP_TCB_SEND_LOCK(stcb);
12725                         if (sp->msg_is_complete) {
12726                                 strm->last_msg_incomplete = 0;
12727                                 asoc->stream_locked = 0;
12728                         } else {
12729                                 /*
12730                                  * Just got locked to this guy in case of an
12731                                  * interrupt.
12732                                  */
12733                                 strm->last_msg_incomplete = 1;
12734                                 asoc->stream_locked = 1;
12735                                 asoc->stream_locked_on = srcv->sinfo_stream;
12736                                 sp->sender_all_done = 0;
12737                         }
12738                         sctp_snd_sb_alloc(stcb, sp->length);
12739                         atomic_add_int(&asoc->stream_queue_cnt, 1);
12740                         if ((srcv->sinfo_flags & SCTP_UNORDERED) == 0) {
12741                                 sp->strseq = strm->next_sequence_sent;
12742                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_AT_SEND_2_SCTP) {
12743                                         sctp_misc_ints(SCTP_STRMOUT_LOG_ASSIGN,
12744                                             (uintptr_t) stcb, sp->length,
12745                                             (uint32_t) ((srcv->sinfo_stream << 16) | sp->strseq), 0);
12746                                 }
12747                                 strm->next_sequence_sent++;
12748                         } else {
12749                                 SCTP_STAT_INCR(sctps_sends_with_unord);
12750                         }
12751                         TAILQ_INSERT_TAIL(&strm->outqueue, sp, next);
12752                         stcb->asoc.ss_functions.sctp_ss_add_to_stream(stcb, asoc, strm, sp, 1);
12753                         SCTP_TCB_SEND_UNLOCK(stcb);
12754                 } else {
12755                         SCTP_TCB_SEND_LOCK(stcb);
12756                         sp = TAILQ_LAST(&strm->outqueue, sctp_streamhead);
12757                         SCTP_TCB_SEND_UNLOCK(stcb);
12758                         if (sp == NULL) {
12759                                 /* ???? Huh ??? last msg is gone */
12760 #ifdef INVARIANTS
12761                                 panic("Warning: Last msg marked incomplete, yet nothing left?");
12762 #else
12763                                 SCTP_PRINTF("Warning: Last msg marked incomplete, yet nothing left?\n");
12764                                 strm->last_msg_incomplete = 0;
12765 #endif
12766                                 goto do_a_copy_in;
12767
12768                         }
12769                 }
12770                 while (uio->uio_resid > 0) {
12771                         /* How much room do we have? */
12772                         struct mbuf *new_tail, *mm;
12773
12774                         if (SCTP_SB_LIMIT_SND(so) > stcb->asoc.total_output_queue_size)
12775                                 max_len = SCTP_SB_LIMIT_SND(so) - stcb->asoc.total_output_queue_size;
12776                         else
12777                                 max_len = 0;
12778
12779                         if ((max_len > SCTP_BASE_SYSCTL(sctp_add_more_threshold)) ||
12780                             (max_len && (SCTP_SB_LIMIT_SND(so) < SCTP_BASE_SYSCTL(sctp_add_more_threshold))) ||
12781                             (uio->uio_resid && (uio->uio_resid <= (int)max_len))) {
12782                                 sndout = 0;
12783                                 new_tail = NULL;
12784                                 if (hold_tcblock) {
12785                                         SCTP_TCB_UNLOCK(stcb);
12786                                         hold_tcblock = 0;
12787                                 }
12788                                 mm = sctp_copy_resume(uio, max_len, user_marks_eor, &error, &sndout, &new_tail);
12789                                 if ((mm == NULL) || error) {
12790                                         if (mm) {
12791                                                 sctp_m_freem(mm);
12792                                         }
12793                                         goto out;
12794                                 }
12795                                 /* Update the mbuf and count */
12796                                 SCTP_TCB_SEND_LOCK(stcb);
12797                                 if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
12798                                         /*
12799                                          * we need to get out. Peer probably
12800                                          * aborted.
12801                                          */
12802                                         sctp_m_freem(mm);
12803                                         if (stcb->asoc.state & SCTP_PCB_FLAGS_WAS_ABORTED) {
12804                                                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
12805                                                 error = ECONNRESET;
12806                                         }
12807                                         SCTP_TCB_SEND_UNLOCK(stcb);
12808                                         goto out;
12809                                 }
12810                                 if (sp->tail_mbuf) {
12811                                         /* tack it to the end */
12812                                         SCTP_BUF_NEXT(sp->tail_mbuf) = mm;
12813                                         sp->tail_mbuf = new_tail;
12814                                 } else {
12815                                         /* A stolen mbuf */
12816                                         sp->data = mm;
12817                                         sp->tail_mbuf = new_tail;
12818                                 }
12819                                 sctp_snd_sb_alloc(stcb, sndout);
12820                                 atomic_add_int(&sp->length, sndout);
12821                                 len += sndout;
12822
12823                                 /* Did we reach EOR? */
12824                                 if ((uio->uio_resid == 0) &&
12825                                     ((user_marks_eor == 0) ||
12826                                     (srcv->sinfo_flags & SCTP_EOF) ||
12827                                     (user_marks_eor && (srcv->sinfo_flags & SCTP_EOR)))) {
12828                                         sp->msg_is_complete = 1;
12829                                 } else {
12830                                         sp->msg_is_complete = 0;
12831                                 }
12832                                 SCTP_TCB_SEND_UNLOCK(stcb);
12833                         }
12834                         if (uio->uio_resid == 0) {
12835                                 /* got it all? */
12836                                 continue;
12837                         }
12838                         /* PR-SCTP? */
12839                         if ((asoc->peer_supports_prsctp) && (asoc->sent_queue_cnt_removeable > 0)) {
12840                                 /*
12841                                  * This is ugly but we must assure locking
12842                                  * order
12843                                  */
12844                                 if (hold_tcblock == 0) {
12845                                         SCTP_TCB_LOCK(stcb);
12846                                         hold_tcblock = 1;
12847                                 }
12848                                 sctp_prune_prsctp(stcb, asoc, srcv, sndlen);
12849                                 inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
12850                                 if (SCTP_SB_LIMIT_SND(so) > stcb->asoc.total_output_queue_size)
12851                                         max_len = SCTP_SB_LIMIT_SND(so) - inqueue_bytes;
12852                                 else
12853                                         max_len = 0;
12854                                 if (max_len > 0) {
12855                                         continue;
12856                                 }
12857                                 SCTP_TCB_UNLOCK(stcb);
12858                                 hold_tcblock = 0;
12859                         }
12860                         /* wait for space now */
12861                         if (non_blocking) {
12862                                 /* Non-blocking io in place out */
12863                                 goto skip_out_eof;
12864                         }
12865                         /* What about the INIT, send it maybe */
12866                         if (queue_only_for_init) {
12867                                 if (hold_tcblock == 0) {
12868                                         SCTP_TCB_LOCK(stcb);
12869                                         hold_tcblock = 1;
12870                                 }
12871                                 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_OPEN) {
12872                                         /* a collision took us forward? */
12873                                         queue_only = 0;
12874                                 } else {
12875                                         sctp_send_initiate(inp, stcb, SCTP_SO_LOCKED);
12876                                         SCTP_SET_STATE(asoc, SCTP_STATE_COOKIE_WAIT);
12877                                         queue_only = 1;
12878                                 }
12879                         }
12880                         if ((net->flight_size > net->cwnd) &&
12881                             (asoc->sctp_cmt_on_off == 0)) {
12882                                 SCTP_STAT_INCR(sctps_send_cwnd_avoid);
12883                                 queue_only = 1;
12884                         } else if (asoc->ifp_had_enobuf) {
12885                                 SCTP_STAT_INCR(sctps_ifnomemqueued);
12886                                 if (net->flight_size > (2 * net->mtu)) {
12887                                         queue_only = 1;
12888                                 }
12889                                 asoc->ifp_had_enobuf = 0;
12890                         }
12891                         un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
12892                             (stcb->asoc.stream_queue_cnt * sizeof(struct sctp_data_chunk)));
12893                         if ((sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY)) &&
12894                             (stcb->asoc.total_flight > 0) &&
12895                             (stcb->asoc.stream_queue_cnt < SCTP_MAX_DATA_BUNDLING) &&
12896                             (un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD))) {
12897
12898                                 /*-
12899                                  * Ok, Nagle is set on and we have data outstanding.
12900                                  * Don't send anything and let SACKs drive out the
12901                                  * data unless wen have a "full" segment to send.
12902                                  */
12903                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
12904                                         sctp_log_nagle_event(stcb, SCTP_NAGLE_APPLIED);
12905                                 }
12906                                 SCTP_STAT_INCR(sctps_naglequeued);
12907                                 nagle_applies = 1;
12908                         } else {
12909                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
12910                                         if (sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY))
12911                                                 sctp_log_nagle_event(stcb, SCTP_NAGLE_SKIPPED);
12912                                 }
12913                                 SCTP_STAT_INCR(sctps_naglesent);
12914                                 nagle_applies = 0;
12915                         }
12916                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
12917
12918                                 sctp_misc_ints(SCTP_CWNDLOG_PRESEND, queue_only_for_init, queue_only,
12919                                     nagle_applies, un_sent);
12920                                 sctp_misc_ints(SCTP_CWNDLOG_PRESEND, stcb->asoc.total_output_queue_size,
12921                                     stcb->asoc.total_flight,
12922                                     stcb->asoc.chunks_on_out_queue, stcb->asoc.total_flight_count);
12923                         }
12924                         if (queue_only_for_init)
12925                                 queue_only_for_init = 0;
12926                         if ((queue_only == 0) && (nagle_applies == 0)) {
12927                                 /*-
12928                                  * need to start chunk output
12929                                  * before blocking.. note that if
12930                                  * a lock is already applied, then
12931                                  * the input via the net is happening
12932                                  * and I don't need to start output :-D
12933                                  */
12934                                 if (hold_tcblock == 0) {
12935                                         if (SCTP_TCB_TRYLOCK(stcb)) {
12936                                                 hold_tcblock = 1;
12937                                                 sctp_chunk_output(inp,
12938                                                     stcb,
12939                                                     SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
12940                                         }
12941                                 } else {
12942                                         sctp_chunk_output(inp,
12943                                             stcb,
12944                                             SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
12945                                 }
12946                                 if (hold_tcblock == 1) {
12947                                         SCTP_TCB_UNLOCK(stcb);
12948                                         hold_tcblock = 0;
12949                                 }
12950                         }
12951                         SOCKBUF_LOCK(&so->so_snd);
12952                         /*-
12953                          * This is a bit strange, but I think it will
12954                          * work. The total_output_queue_size is locked and
12955                          * protected by the TCB_LOCK, which we just released.
12956                          * There is a race that can occur between releasing it
12957                          * above, and me getting the socket lock, where sacks
12958                          * come in but we have not put the SB_WAIT on the
12959                          * so_snd buffer to get the wakeup. After the LOCK
12960                          * is applied the sack_processing will also need to
12961                          * LOCK the so->so_snd to do the actual sowwakeup(). So
12962                          * once we have the socket buffer lock if we recheck the
12963                          * size we KNOW we will get to sleep safely with the
12964                          * wakeup flag in place.
12965                          */
12966                         if (SCTP_SB_LIMIT_SND(so) <= (stcb->asoc.total_output_queue_size +
12967                             min(SCTP_BASE_SYSCTL(sctp_add_more_threshold), SCTP_SB_LIMIT_SND(so)))) {
12968                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
12969                                         sctp_log_block(SCTP_BLOCK_LOG_INTO_BLK,
12970                                             asoc, uio->uio_resid);
12971                                 }
12972                                 be.error = 0;
12973                                 stcb->block_entry = &be;
12974                                 error = sbwait(&so->so_snd);
12975                                 stcb->block_entry = NULL;
12976
12977                                 if (error || so->so_error || be.error) {
12978                                         if (error == 0) {
12979                                                 if (so->so_error)
12980                                                         error = so->so_error;
12981                                                 if (be.error) {
12982                                                         error = be.error;
12983                                                 }
12984                                         }
12985                                         SOCKBUF_UNLOCK(&so->so_snd);
12986                                         goto out_unlocked;
12987                                 }
12988                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
12989                                         sctp_log_block(SCTP_BLOCK_LOG_OUTOF_BLK,
12990                                             asoc, stcb->asoc.total_output_queue_size);
12991                                 }
12992                         }
12993                         SOCKBUF_UNLOCK(&so->so_snd);
12994                         if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
12995                                 goto out_unlocked;
12996                         }
12997                 }
12998                 SCTP_TCB_SEND_LOCK(stcb);
12999                 if (sp) {
13000                         if (sp->msg_is_complete == 0) {
13001                                 strm->last_msg_incomplete = 1;
13002                                 asoc->stream_locked = 1;
13003                                 asoc->stream_locked_on = srcv->sinfo_stream;
13004                         } else {
13005                                 sp->sender_all_done = 1;
13006                                 strm->last_msg_incomplete = 0;
13007                                 asoc->stream_locked = 0;
13008                         }
13009                 } else {
13010                         SCTP_PRINTF("Huh no sp TSNH?\n");
13011                         strm->last_msg_incomplete = 0;
13012                         asoc->stream_locked = 0;
13013                 }
13014                 SCTP_TCB_SEND_UNLOCK(stcb);
13015                 if (uio->uio_resid == 0) {
13016                         got_all_of_the_send = 1;
13017                 }
13018         } else {
13019                 /* We send in a 0, since we do NOT have any locks */
13020                 error = sctp_msg_append(stcb, net, top, srcv, 0);
13021                 top = NULL;
13022                 if (srcv->sinfo_flags & SCTP_EOF) {
13023                         /*
13024                          * This should only happen for Panda for the mbuf
13025                          * send case, which does NOT yet support EEOR mode.
13026                          * Thus, we can just set this flag to do the proper
13027                          * EOF handling.
13028                          */
13029                         got_all_of_the_send = 1;
13030                 }
13031         }
13032         if (error) {
13033                 goto out;
13034         }
13035 dataless_eof:
13036         /* EOF thing ? */
13037         if ((srcv->sinfo_flags & SCTP_EOF) &&
13038             (got_all_of_the_send == 1)) {
13039                 int cnt;
13040
13041                 SCTP_STAT_INCR(sctps_sends_with_eof);
13042                 error = 0;
13043                 if (hold_tcblock == 0) {
13044                         SCTP_TCB_LOCK(stcb);
13045                         hold_tcblock = 1;
13046                 }
13047                 cnt = sctp_is_there_unsent_data(stcb, SCTP_SO_LOCKED);
13048                 if (TAILQ_EMPTY(&asoc->send_queue) &&
13049                     TAILQ_EMPTY(&asoc->sent_queue) &&
13050                     (cnt == 0)) {
13051                         if (asoc->locked_on_sending) {
13052                                 goto abort_anyway;
13053                         }
13054                         /* there is nothing queued to send, so I'm done... */
13055                         if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) &&
13056                             (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
13057                             (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
13058                                 struct sctp_nets *netp;
13059
13060                                 if (stcb->asoc.alternate) {
13061                                         netp = stcb->asoc.alternate;
13062                                 } else {
13063                                         netp = stcb->asoc.primary_destination;
13064                                 }
13065                                 /* only send SHUTDOWN the first time through */
13066                                 sctp_send_shutdown(stcb, netp);
13067                                 if (SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) {
13068                                         SCTP_STAT_DECR_GAUGE32(sctps_currestab);
13069                                 }
13070                                 SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_SENT);
13071                                 SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING);
13072                                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb,
13073                                     netp);
13074                                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
13075                                     asoc->primary_destination);
13076                         }
13077                 } else {
13078                         /*-
13079                          * we still got (or just got) data to send, so set
13080                          * SHUTDOWN_PENDING
13081                          */
13082                         /*-
13083                          * XXX sockets draft says that SCTP_EOF should be
13084                          * sent with no data.  currently, we will allow user
13085                          * data to be sent first and move to
13086                          * SHUTDOWN-PENDING
13087                          */
13088                         if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) &&
13089                             (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
13090                             (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
13091                                 if (hold_tcblock == 0) {
13092                                         SCTP_TCB_LOCK(stcb);
13093                                         hold_tcblock = 1;
13094                                 }
13095                                 if (asoc->locked_on_sending) {
13096                                         /* Locked to send out the data */
13097                                         struct sctp_stream_queue_pending *sp;
13098
13099                                         sp = TAILQ_LAST(&asoc->locked_on_sending->outqueue, sctp_streamhead);
13100                                         if (sp) {
13101                                                 if ((sp->length == 0) && (sp->msg_is_complete == 0))
13102                                                         asoc->state |= SCTP_STATE_PARTIAL_MSG_LEFT;
13103                                         }
13104                                 }
13105                                 asoc->state |= SCTP_STATE_SHUTDOWN_PENDING;
13106                                 if (TAILQ_EMPTY(&asoc->send_queue) &&
13107                                     TAILQ_EMPTY(&asoc->sent_queue) &&
13108                                     (asoc->state & SCTP_STATE_PARTIAL_MSG_LEFT)) {
13109                         abort_anyway:
13110                                         if (free_cnt_applied) {
13111                                                 atomic_add_int(&stcb->asoc.refcnt, -1);
13112                                                 free_cnt_applied = 0;
13113                                         }
13114                                         sctp_abort_an_association(stcb->sctp_ep, stcb,
13115                                             NULL, SCTP_SO_LOCKED);
13116                                         /*
13117                                          * now relock the stcb so everything
13118                                          * is sane
13119                                          */
13120                                         hold_tcblock = 0;
13121                                         stcb = NULL;
13122                                         goto out;
13123                                 }
13124                                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
13125                                     asoc->primary_destination);
13126                                 sctp_feature_off(inp, SCTP_PCB_FLAGS_NODELAY);
13127                         }
13128                 }
13129         }
13130 skip_out_eof:
13131         if (!TAILQ_EMPTY(&stcb->asoc.control_send_queue)) {
13132                 some_on_control = 1;
13133         }
13134         if (queue_only_for_init) {
13135                 if (hold_tcblock == 0) {
13136                         SCTP_TCB_LOCK(stcb);
13137                         hold_tcblock = 1;
13138                 }
13139                 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_OPEN) {
13140                         /* a collision took us forward? */
13141                         queue_only = 0;
13142                 } else {
13143                         sctp_send_initiate(inp, stcb, SCTP_SO_LOCKED);
13144                         SCTP_SET_STATE(&stcb->asoc, SCTP_STATE_COOKIE_WAIT);
13145                         queue_only = 1;
13146                 }
13147         }
13148         if ((net->flight_size > net->cwnd) &&
13149             (stcb->asoc.sctp_cmt_on_off == 0)) {
13150                 SCTP_STAT_INCR(sctps_send_cwnd_avoid);
13151                 queue_only = 1;
13152         } else if (asoc->ifp_had_enobuf) {
13153                 SCTP_STAT_INCR(sctps_ifnomemqueued);
13154                 if (net->flight_size > (2 * net->mtu)) {
13155                         queue_only = 1;
13156                 }
13157                 asoc->ifp_had_enobuf = 0;
13158         }
13159         un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
13160             (stcb->asoc.stream_queue_cnt * sizeof(struct sctp_data_chunk)));
13161         if ((sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY)) &&
13162             (stcb->asoc.total_flight > 0) &&
13163             (stcb->asoc.stream_queue_cnt < SCTP_MAX_DATA_BUNDLING) &&
13164             (un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD))) {
13165                 /*-
13166                  * Ok, Nagle is set on and we have data outstanding.
13167                  * Don't send anything and let SACKs drive out the
13168                  * data unless wen have a "full" segment to send.
13169                  */
13170                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
13171                         sctp_log_nagle_event(stcb, SCTP_NAGLE_APPLIED);
13172                 }
13173                 SCTP_STAT_INCR(sctps_naglequeued);
13174                 nagle_applies = 1;
13175         } else {
13176                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
13177                         if (sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY))
13178                                 sctp_log_nagle_event(stcb, SCTP_NAGLE_SKIPPED);
13179                 }
13180                 SCTP_STAT_INCR(sctps_naglesent);
13181                 nagle_applies = 0;
13182         }
13183         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13184                 sctp_misc_ints(SCTP_CWNDLOG_PRESEND, queue_only_for_init, queue_only,
13185                     nagle_applies, un_sent);
13186                 sctp_misc_ints(SCTP_CWNDLOG_PRESEND, stcb->asoc.total_output_queue_size,
13187                     stcb->asoc.total_flight,
13188                     stcb->asoc.chunks_on_out_queue, stcb->asoc.total_flight_count);
13189         }
13190         if ((queue_only == 0) && (nagle_applies == 0) && (stcb->asoc.peers_rwnd && un_sent)) {
13191                 /* we can attempt to send too. */
13192                 if (hold_tcblock == 0) {
13193                         /*
13194                          * If there is activity recv'ing sacks no need to
13195                          * send
13196                          */
13197                         if (SCTP_TCB_TRYLOCK(stcb)) {
13198                                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13199                                 hold_tcblock = 1;
13200                         }
13201                 } else {
13202                         sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13203                 }
13204         } else if ((queue_only == 0) &&
13205                     (stcb->asoc.peers_rwnd == 0) &&
13206             (stcb->asoc.total_flight == 0)) {
13207                 /* We get to have a probe outstanding */
13208                 if (hold_tcblock == 0) {
13209                         hold_tcblock = 1;
13210                         SCTP_TCB_LOCK(stcb);
13211                 }
13212                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13213         } else if (some_on_control) {
13214                 int num_out, reason, frag_point;
13215
13216                 /* Here we do control only */
13217                 if (hold_tcblock == 0) {
13218                         hold_tcblock = 1;
13219                         SCTP_TCB_LOCK(stcb);
13220                 }
13221                 frag_point = sctp_get_frag_point(stcb, &stcb->asoc);
13222                 (void)sctp_med_chunk_output(inp, stcb, &stcb->asoc, &num_out,
13223                     &reason, 1, 1, &now, &now_filled, frag_point, SCTP_SO_LOCKED);
13224         }
13225         SCTPDBG(SCTP_DEBUG_OUTPUT1, "USR Send complete qo:%d prw:%d unsent:%d tf:%d cooq:%d toqs:%d err:%d\n",
13226             queue_only, stcb->asoc.peers_rwnd, un_sent,
13227             stcb->asoc.total_flight, stcb->asoc.chunks_on_out_queue,
13228             stcb->asoc.total_output_queue_size, error);
13229
13230 out:
13231 out_unlocked:
13232
13233         if (local_soresv && stcb) {
13234                 atomic_subtract_int(&stcb->asoc.sb_send_resv, sndlen);
13235         }
13236         if (create_lock_applied) {
13237                 SCTP_ASOC_CREATE_UNLOCK(inp);
13238         }
13239         if ((stcb) && hold_tcblock) {
13240                 SCTP_TCB_UNLOCK(stcb);
13241         }
13242         if (stcb && free_cnt_applied) {
13243                 atomic_add_int(&stcb->asoc.refcnt, -1);
13244         }
13245 #ifdef INVARIANTS
13246         if (stcb) {
13247                 if (mtx_owned(&stcb->tcb_mtx)) {
13248                         panic("Leaving with tcb mtx owned?");
13249                 }
13250                 if (mtx_owned(&stcb->tcb_send_mtx)) {
13251                         panic("Leaving with tcb send mtx owned?");
13252                 }
13253         }
13254 #endif
13255 #ifdef INVARIANTS
13256         if (inp) {
13257                 sctp_validate_no_locks(inp);
13258         } else {
13259                 SCTP_PRINTF("Warning - inp is NULL so cant validate locks\n");
13260         }
13261 #endif
13262         if (top) {
13263                 sctp_m_freem(top);
13264         }
13265         if (control) {
13266                 sctp_m_freem(control);
13267         }
13268         return (error);
13269 }
13270
13271
13272 /*
13273  * generate an AUTHentication chunk, if required
13274  */
13275 struct mbuf *
13276 sctp_add_auth_chunk(struct mbuf *m, struct mbuf **m_end,
13277     struct sctp_auth_chunk **auth_ret, uint32_t * offset,
13278     struct sctp_tcb *stcb, uint8_t chunk)
13279 {
13280         struct mbuf *m_auth;
13281         struct sctp_auth_chunk *auth;
13282         int chunk_len;
13283         struct mbuf *cn;
13284
13285         if ((m_end == NULL) || (auth_ret == NULL) || (offset == NULL) ||
13286             (stcb == NULL))
13287                 return (m);
13288
13289         /* sysctl disabled auth? */
13290         if (SCTP_BASE_SYSCTL(sctp_auth_disable))
13291                 return (m);
13292
13293         /* peer doesn't do auth... */
13294         if (!stcb->asoc.peer_supports_auth) {
13295                 return (m);
13296         }
13297         /* does the requested chunk require auth? */
13298         if (!sctp_auth_is_required_chunk(chunk, stcb->asoc.peer_auth_chunks)) {
13299                 return (m);
13300         }
13301         m_auth = sctp_get_mbuf_for_msg(sizeof(*auth), 0, M_DONTWAIT, 1, MT_HEADER);
13302         if (m_auth == NULL) {
13303                 /* no mbuf's */
13304                 return (m);
13305         }
13306         /* reserve some space if this will be the first mbuf */
13307         if (m == NULL)
13308                 SCTP_BUF_RESV_UF(m_auth, SCTP_MIN_OVERHEAD);
13309         /* fill in the AUTH chunk details */
13310         auth = mtod(m_auth, struct sctp_auth_chunk *);
13311         bzero(auth, sizeof(*auth));
13312         auth->ch.chunk_type = SCTP_AUTHENTICATION;
13313         auth->ch.chunk_flags = 0;
13314         chunk_len = sizeof(*auth) +
13315             sctp_get_hmac_digest_len(stcb->asoc.peer_hmac_id);
13316         auth->ch.chunk_length = htons(chunk_len);
13317         auth->hmac_id = htons(stcb->asoc.peer_hmac_id);
13318         /* key id and hmac digest will be computed and filled in upon send */
13319
13320         /* save the offset where the auth was inserted into the chain */
13321         *offset = 0;
13322         for (cn = m; cn; cn = SCTP_BUF_NEXT(cn)) {
13323                 *offset += SCTP_BUF_LEN(cn);
13324         }
13325
13326         /* update length and return pointer to the auth chunk */
13327         SCTP_BUF_LEN(m_auth) = chunk_len;
13328         m = sctp_copy_mbufchain(m_auth, m, m_end, 1, chunk_len, 0);
13329         if (auth_ret != NULL)
13330                 *auth_ret = auth;
13331
13332         return (m);
13333 }
13334
13335 #ifdef INET6
13336 int
13337 sctp_v6src_match_nexthop(struct sockaddr_in6 *src6, sctp_route_t * ro)
13338 {
13339         struct nd_prefix *pfx = NULL;
13340         struct nd_pfxrouter *pfxrtr = NULL;
13341         struct sockaddr_in6 gw6;
13342
13343         if (ro == NULL || ro->ro_rt == NULL || src6->sin6_family != AF_INET6)
13344                 return (0);
13345
13346         /* get prefix entry of address */
13347         LIST_FOREACH(pfx, &MODULE_GLOBAL(nd_prefix), ndpr_entry) {
13348                 if (pfx->ndpr_stateflags & NDPRF_DETACHED)
13349                         continue;
13350                 if (IN6_ARE_MASKED_ADDR_EQUAL(&pfx->ndpr_prefix.sin6_addr,
13351                     &src6->sin6_addr, &pfx->ndpr_mask))
13352                         break;
13353         }
13354         /* no prefix entry in the prefix list */
13355         if (pfx == NULL) {
13356                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "No prefix entry for ");
13357                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)src6);
13358                 return (0);
13359         }
13360         SCTPDBG(SCTP_DEBUG_OUTPUT2, "v6src_match_nexthop(), Prefix entry is ");
13361         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)src6);
13362
13363         /* search installed gateway from prefix entry */
13364         LIST_FOREACH(pfxrtr, &pfx->ndpr_advrtrs, pfr_entry) {
13365                 memset(&gw6, 0, sizeof(struct sockaddr_in6));
13366                 gw6.sin6_family = AF_INET6;
13367                 gw6.sin6_len = sizeof(struct sockaddr_in6);
13368                 memcpy(&gw6.sin6_addr, &pfxrtr->router->rtaddr,
13369                     sizeof(struct in6_addr));
13370                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "prefix router is ");
13371                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)&gw6);
13372                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "installed router is ");
13373                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, ro->ro_rt->rt_gateway);
13374                 if (sctp_cmpaddr((struct sockaddr *)&gw6,
13375                     ro->ro_rt->rt_gateway)) {
13376                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "pfxrouter is installed\n");
13377                         return (1);
13378                 }
13379         }
13380         SCTPDBG(SCTP_DEBUG_OUTPUT2, "pfxrouter is not installed\n");
13381         return (0);
13382 }
13383
13384 #endif
13385
13386 int
13387 sctp_v4src_match_nexthop(struct sctp_ifa *sifa, sctp_route_t * ro)
13388 {
13389 #ifdef INET
13390         struct sockaddr_in *sin, *mask;
13391         struct ifaddr *ifa;
13392         struct in_addr srcnetaddr, gwnetaddr;
13393
13394         if (ro == NULL || ro->ro_rt == NULL ||
13395             sifa->address.sa.sa_family != AF_INET) {
13396                 return (0);
13397         }
13398         ifa = (struct ifaddr *)sifa->ifa;
13399         mask = (struct sockaddr_in *)(ifa->ifa_netmask);
13400         sin = (struct sockaddr_in *)&sifa->address.sin;
13401         srcnetaddr.s_addr = (sin->sin_addr.s_addr & mask->sin_addr.s_addr);
13402         SCTPDBG(SCTP_DEBUG_OUTPUT1, "match_nexthop4: src address is ");
13403         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, &sifa->address.sa);
13404         SCTPDBG(SCTP_DEBUG_OUTPUT1, "network address is %x\n", srcnetaddr.s_addr);
13405
13406         sin = (struct sockaddr_in *)ro->ro_rt->rt_gateway;
13407         gwnetaddr.s_addr = (sin->sin_addr.s_addr & mask->sin_addr.s_addr);
13408         SCTPDBG(SCTP_DEBUG_OUTPUT1, "match_nexthop4: nexthop is ");
13409         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, ro->ro_rt->rt_gateway);
13410         SCTPDBG(SCTP_DEBUG_OUTPUT1, "network address is %x\n", gwnetaddr.s_addr);
13411         if (srcnetaddr.s_addr == gwnetaddr.s_addr) {
13412                 return (1);
13413         }
13414 #endif
13415         return (0);
13416 }