sys/netinet/sctp_output.c

   1 /*-
   2  * SPDX-License-Identifier: BSD-3-Clause
   3  *
   4  * Copyright (c) 2001-2008, by Cisco Systems, Inc. All rights reserved.
   5  * Copyright (c) 2008-2012, by Randall Stewart. All rights reserved.
   6  * Copyright (c) 2008-2012, by Michael Tuexen. All rights reserved.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions are met:
  10  *
  11  * a) Redistributions of source code must retain the above copyright notice,
  12  *    this list of conditions and the following disclaimer.
  13  *
  14  * b) Redistributions in binary form must reproduce the above copyright
  15  *    notice, this list of conditions and the following disclaimer in
  16  *    the documentation and/or other materials provided with the distribution.
  17  *
  18  * c) Neither the name of Cisco Systems, Inc. nor the names of its
  19  *    contributors may be used to endorse or promote products derived
  20  *    from this software without specific prior written permission.
  21  *
  22  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  23  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
  24  * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  25  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
  26  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  27  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  28  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  29  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  30  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  31  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
  32  * THE POSSIBILITY OF SUCH DAMAGE.
  33  */
  34
  35 #include <sys/cdefs.h>
  36 __FBSDID("$FreeBSD$");
  37
  38 #include <netinet/sctp_os.h>
  39 #include <sys/proc.h>
  40 #include <netinet/sctp_var.h>
  41 #include <netinet/sctp_sysctl.h>
  42 #include <netinet/sctp_header.h>
  43 #include <netinet/sctp_pcb.h>
  44 #include <netinet/sctputil.h>
  45 #include <netinet/sctp_output.h>
  46 #include <netinet/sctp_uio.h>
  47 #include <netinet/sctputil.h>
  48 #include <netinet/sctp_auth.h>
  49 #include <netinet/sctp_timer.h>
  50 #include <netinet/sctp_asconf.h>
  51 #include <netinet/sctp_indata.h>
  52 #include <netinet/sctp_bsd_addr.h>
  53 #include <netinet/sctp_input.h>
  54 #include <netinet/sctp_crc32.h>
  55 #include <netinet/sctp_kdtrace.h>
  56 #if defined(INET) || defined(INET6)
  57 #include <netinet/udp.h>
  58 #endif
  59 #include <netinet/udp_var.h>
  60 #include <machine/in_cksum.h>
  61
  62
  63 #define SCTP_MAX_GAPS_INARRAY 4
  64 struct sack_track {
  65         uint8_t right_edge;     /* mergable on the right edge */
  66         uint8_t left_edge;      /* mergable on the left edge */
  67         uint8_t num_entries;
  68         uint8_t spare;
  69         struct sctp_gap_ack_block gaps[SCTP_MAX_GAPS_INARRAY];
  70 };
  71
  72 const struct sack_track sack_array[256] = {
  73         {0, 0, 0, 0,            /* 0x00 */
  74                 {{0, 0},
  75                 {0, 0},
  76                 {0, 0},
  77                 {0, 0}
  78                 }
  79         },
  80         {1, 0, 1, 0,            /* 0x01 */
  81                 {{0, 0},
  82                 {0, 0},
  83                 {0, 0},
  84                 {0, 0}
  85                 }
  86         },
  87         {0, 0, 1, 0,            /* 0x02 */
  88                 {{1, 1},
  89                 {0, 0},
  90                 {0, 0},
  91                 {0, 0}
  92                 }
  93         },
  94         {1, 0, 1, 0,            /* 0x03 */
  95                 {{0, 1},
  96                 {0, 0},
  97                 {0, 0},
  98                 {0, 0}
  99                 }
 100         },
 101         {0, 0, 1, 0,            /* 0x04 */
 102                 {{2, 2},
 103                 {0, 0},
 104                 {0, 0},
 105                 {0, 0}
 106                 }
 107         },
 108         {1, 0, 2, 0,            /* 0x05 */
 109                 {{0, 0},
 110                 {2, 2},
 111                 {0, 0},
 112                 {0, 0}
 113                 }
 114         },
 115         {0, 0, 1, 0,            /* 0x06 */
 116                 {{1, 2},
 117                 {0, 0},
 118                 {0, 0},
 119                 {0, 0}
 120                 }
 121         },
 122         {1, 0, 1, 0,            /* 0x07 */
 123                 {{0, 2},
 124                 {0, 0},
 125                 {0, 0},
 126                 {0, 0}
 127                 }
 128         },
 129         {0, 0, 1, 0,            /* 0x08 */
 130                 {{3, 3},
 131                 {0, 0},
 132                 {0, 0},
 133                 {0, 0}
 134                 }
 135         },
 136         {1, 0, 2, 0,            /* 0x09 */
 137                 {{0, 0},
 138                 {3, 3},
 139                 {0, 0},
 140                 {0, 0}
 141                 }
 142         },
 143         {0, 0, 2, 0,            /* 0x0a */
 144                 {{1, 1},
 145                 {3, 3},
 146                 {0, 0},
 147                 {0, 0}
 148                 }
 149         },
 150         {1, 0, 2, 0,            /* 0x0b */
 151                 {{0, 1},
 152                 {3, 3},
 153                 {0, 0},
 154                 {0, 0}
 155                 }
 156         },
 157         {0, 0, 1, 0,            /* 0x0c */
 158                 {{2, 3},
 159                 {0, 0},
 160                 {0, 0},
 161                 {0, 0}
 162                 }
 163         },
 164         {1, 0, 2, 0,            /* 0x0d */
 165                 {{0, 0},
 166                 {2, 3},
 167                 {0, 0},
 168                 {0, 0}
 169                 }
 170         },
 171         {0, 0, 1, 0,            /* 0x0e */
 172                 {{1, 3},
 173                 {0, 0},
 174                 {0, 0},
 175                 {0, 0}
 176                 }
 177         },
 178         {1, 0, 1, 0,            /* 0x0f */
 179                 {{0, 3},
 180                 {0, 0},
 181                 {0, 0},
 182                 {0, 0}
 183                 }
 184         },
 185         {0, 0, 1, 0,            /* 0x10 */
 186                 {{4, 4},
 187                 {0, 0},
 188                 {0, 0},
 189                 {0, 0}
 190                 }
 191         },
 192         {1, 0, 2, 0,            /* 0x11 */
 193                 {{0, 0},
 194                 {4, 4},
 195                 {0, 0},
 196                 {0, 0}
 197                 }
 198         },
 199         {0, 0, 2, 0,            /* 0x12 */
 200                 {{1, 1},
 201                 {4, 4},
 202                 {0, 0},
 203                 {0, 0}
 204                 }
 205         },
 206         {1, 0, 2, 0,            /* 0x13 */
 207                 {{0, 1},
 208                 {4, 4},
 209                 {0, 0},
 210                 {0, 0}
 211                 }
 212         },
 213         {0, 0, 2, 0,            /* 0x14 */
 214                 {{2, 2},
 215                 {4, 4},
 216                 {0, 0},
 217                 {0, 0}
 218                 }
 219         },
 220         {1, 0, 3, 0,            /* 0x15 */
 221                 {{0, 0},
 222                 {2, 2},
 223                 {4, 4},
 224                 {0, 0}
 225                 }
 226         },
 227         {0, 0, 2, 0,            /* 0x16 */
 228                 {{1, 2},
 229                 {4, 4},
 230                 {0, 0},
 231                 {0, 0}
 232                 }
 233         },
 234         {1, 0, 2, 0,            /* 0x17 */
 235                 {{0, 2},
 236                 {4, 4},
 237                 {0, 0},
 238                 {0, 0}
 239                 }
 240         },
 241         {0, 0, 1, 0,            /* 0x18 */
 242                 {{3, 4},
 243                 {0, 0},
 244                 {0, 0},
 245                 {0, 0}
 246                 }
 247         },
 248         {1, 0, 2, 0,            /* 0x19 */
 249                 {{0, 0},
 250                 {3, 4},
 251                 {0, 0},
 252                 {0, 0}
 253                 }
 254         },
 255         {0, 0, 2, 0,            /* 0x1a */
 256                 {{1, 1},
 257                 {3, 4},
 258                 {0, 0},
 259                 {0, 0}
 260                 }
 261         },
 262         {1, 0, 2, 0,            /* 0x1b */
 263                 {{0, 1},
 264                 {3, 4},
 265                 {0, 0},
 266                 {0, 0}
 267                 }
 268         },
 269         {0, 0, 1, 0,            /* 0x1c */
 270                 {{2, 4},
 271                 {0, 0},
 272                 {0, 0},
 273                 {0, 0}
 274                 }
 275         },
 276         {1, 0, 2, 0,            /* 0x1d */
 277                 {{0, 0},
 278                 {2, 4},
 279                 {0, 0},
 280                 {0, 0}
 281                 }
 282         },
 283         {0, 0, 1, 0,            /* 0x1e */
 284                 {{1, 4},
 285                 {0, 0},
 286                 {0, 0},
 287                 {0, 0}
 288                 }
 289         },
 290         {1, 0, 1, 0,            /* 0x1f */
 291                 {{0, 4},
 292                 {0, 0},
 293                 {0, 0},
 294                 {0, 0}
 295                 }
 296         },
 297         {0, 0, 1, 0,            /* 0x20 */
 298                 {{5, 5},
 299                 {0, 0},
 300                 {0, 0},
 301                 {0, 0}
 302                 }
 303         },
 304         {1, 0, 2, 0,            /* 0x21 */
 305                 {{0, 0},
 306                 {5, 5},
 307                 {0, 0},
 308                 {0, 0}
 309                 }
 310         },
 311         {0, 0, 2, 0,            /* 0x22 */
 312                 {{1, 1},
 313                 {5, 5},
 314                 {0, 0},
 315                 {0, 0}
 316                 }
 317         },
 318         {1, 0, 2, 0,            /* 0x23 */
 319                 {{0, 1},
 320                 {5, 5},
 321                 {0, 0},
 322                 {0, 0}
 323                 }
 324         },
 325         {0, 0, 2, 0,            /* 0x24 */
 326                 {{2, 2},
 327                 {5, 5},
 328                 {0, 0},
 329                 {0, 0}
 330                 }
 331         },
 332         {1, 0, 3, 0,            /* 0x25 */
 333                 {{0, 0},
 334                 {2, 2},
 335                 {5, 5},
 336                 {0, 0}
 337                 }
 338         },
 339         {0, 0, 2, 0,            /* 0x26 */
 340                 {{1, 2},
 341                 {5, 5},
 342                 {0, 0},
 343                 {0, 0}
 344                 }
 345         },
 346         {1, 0, 2, 0,            /* 0x27 */
 347                 {{0, 2},
 348                 {5, 5},
 349                 {0, 0},
 350                 {0, 0}
 351                 }
 352         },
 353         {0, 0, 2, 0,            /* 0x28 */
 354                 {{3, 3},
 355                 {5, 5},
 356                 {0, 0},
 357                 {0, 0}
 358                 }
 359         },
 360         {1, 0, 3, 0,            /* 0x29 */
 361                 {{0, 0},
 362                 {3, 3},
 363                 {5, 5},
 364                 {0, 0}
 365                 }
 366         },
 367         {0, 0, 3, 0,            /* 0x2a */
 368                 {{1, 1},
 369                 {3, 3},
 370                 {5, 5},
 371                 {0, 0}
 372                 }
 373         },
 374         {1, 0, 3, 0,            /* 0x2b */
 375                 {{0, 1},
 376                 {3, 3},
 377                 {5, 5},
 378                 {0, 0}
 379                 }
 380         },
 381         {0, 0, 2, 0,            /* 0x2c */
 382                 {{2, 3},
 383                 {5, 5},
 384                 {0, 0},
 385                 {0, 0}
 386                 }
 387         },
 388         {1, 0, 3, 0,            /* 0x2d */
 389                 {{0, 0},
 390                 {2, 3},
 391                 {5, 5},
 392                 {0, 0}
 393                 }
 394         },
 395         {0, 0, 2, 0,            /* 0x2e */
 396                 {{1, 3},
 397                 {5, 5},
 398                 {0, 0},
 399                 {0, 0}
 400                 }
 401         },
 402         {1, 0, 2, 0,            /* 0x2f */
 403                 {{0, 3},
 404                 {5, 5},
 405                 {0, 0},
 406                 {0, 0}
 407                 }
 408         },
 409         {0, 0, 1, 0,            /* 0x30 */
 410                 {{4, 5},
 411                 {0, 0},
 412                 {0, 0},
 413                 {0, 0}
 414                 }
 415         },
 416         {1, 0, 2, 0,            /* 0x31 */
 417                 {{0, 0},
 418                 {4, 5},
 419                 {0, 0},
 420                 {0, 0}
 421                 }
 422         },
 423         {0, 0, 2, 0,            /* 0x32 */
 424                 {{1, 1},
 425                 {4, 5},
 426                 {0, 0},
 427                 {0, 0}
 428                 }
 429         },
 430         {1, 0, 2, 0,            /* 0x33 */
 431                 {{0, 1},
 432                 {4, 5},
 433                 {0, 0},
 434                 {0, 0}
 435                 }
 436         },
 437         {0, 0, 2, 0,            /* 0x34 */
 438                 {{2, 2},
 439                 {4, 5},
 440                 {0, 0},
 441                 {0, 0}
 442                 }
 443         },
 444         {1, 0, 3, 0,            /* 0x35 */
 445                 {{0, 0},
 446                 {2, 2},
 447                 {4, 5},
 448                 {0, 0}
 449                 }
 450         },
 451         {0, 0, 2, 0,            /* 0x36 */
 452                 {{1, 2},
 453                 {4, 5},
 454                 {0, 0},
 455                 {0, 0}
 456                 }
 457         },
 458         {1, 0, 2, 0,            /* 0x37 */
 459                 {{0, 2},
 460                 {4, 5},
 461                 {0, 0},
 462                 {0, 0}
 463                 }
 464         },
 465         {0, 0, 1, 0,            /* 0x38 */
 466                 {{3, 5},
 467                 {0, 0},
 468                 {0, 0},
 469                 {0, 0}
 470                 }
 471         },
 472         {1, 0, 2, 0,            /* 0x39 */
 473                 {{0, 0},
 474                 {3, 5},
 475                 {0, 0},
 476                 {0, 0}
 477                 }
 478         },
 479         {0, 0, 2, 0,            /* 0x3a */
 480                 {{1, 1},
 481                 {3, 5},
 482                 {0, 0},
 483                 {0, 0}
 484                 }
 485         },
 486         {1, 0, 2, 0,            /* 0x3b */
 487                 {{0, 1},
 488                 {3, 5},
 489                 {0, 0},
 490                 {0, 0}
 491                 }
 492         },
 493         {0, 0, 1, 0,            /* 0x3c */
 494                 {{2, 5},
 495                 {0, 0},
 496                 {0, 0},
 497                 {0, 0}
 498                 }
 499         },
 500         {1, 0, 2, 0,            /* 0x3d */
 501                 {{0, 0},
 502                 {2, 5},
 503                 {0, 0},
 504                 {0, 0}
 505                 }
 506         },
 507         {0, 0, 1, 0,            /* 0x3e */
 508                 {{1, 5},
 509                 {0, 0},
 510                 {0, 0},
 511                 {0, 0}
 512                 }
 513         },
 514         {1, 0, 1, 0,            /* 0x3f */
 515                 {{0, 5},
 516                 {0, 0},
 517                 {0, 0},
 518                 {0, 0}
 519                 }
 520         },
 521         {0, 0, 1, 0,            /* 0x40 */
 522                 {{6, 6},
 523                 {0, 0},
 524                 {0, 0},
 525                 {0, 0}
 526                 }
 527         },
 528         {1, 0, 2, 0,            /* 0x41 */
 529                 {{0, 0},
 530                 {6, 6},
 531                 {0, 0},
 532                 {0, 0}
 533                 }
 534         },
 535         {0, 0, 2, 0,            /* 0x42 */
 536                 {{1, 1},
 537                 {6, 6},
 538                 {0, 0},
 539                 {0, 0}
 540                 }
 541         },
 542         {1, 0, 2, 0,            /* 0x43 */
 543                 {{0, 1},
 544                 {6, 6},
 545                 {0, 0},
 546                 {0, 0}
 547                 }
 548         },
 549         {0, 0, 2, 0,            /* 0x44 */
 550                 {{2, 2},
 551                 {6, 6},
 552                 {0, 0},
 553                 {0, 0}
 554                 }
 555         },
 556         {1, 0, 3, 0,            /* 0x45 */
 557                 {{0, 0},
 558                 {2, 2},
 559                 {6, 6},
 560                 {0, 0}
 561                 }
 562         },
 563         {0, 0, 2, 0,            /* 0x46 */
 564                 {{1, 2},
 565                 {6, 6},
 566                 {0, 0},
 567                 {0, 0}
 568                 }
 569         },
 570         {1, 0, 2, 0,            /* 0x47 */
 571                 {{0, 2},
 572                 {6, 6},
 573                 {0, 0},
 574                 {0, 0}
 575                 }
 576         },
 577         {0, 0, 2, 0,            /* 0x48 */
 578                 {{3, 3},
 579                 {6, 6},
 580                 {0, 0},
 581                 {0, 0}
 582                 }
 583         },
 584         {1, 0, 3, 0,            /* 0x49 */
 585                 {{0, 0},
 586                 {3, 3},
 587                 {6, 6},
 588                 {0, 0}
 589                 }
 590         },
 591         {0, 0, 3, 0,            /* 0x4a */
 592                 {{1, 1},
 593                 {3, 3},
 594                 {6, 6},
 595                 {0, 0}
 596                 }
 597         },
 598         {1, 0, 3, 0,            /* 0x4b */
 599                 {{0, 1},
 600                 {3, 3},
 601                 {6, 6},
 602                 {0, 0}
 603                 }
 604         },
 605         {0, 0, 2, 0,            /* 0x4c */
 606                 {{2, 3},
 607                 {6, 6},
 608                 {0, 0},
 609                 {0, 0}
 610                 }
 611         },
 612         {1, 0, 3, 0,            /* 0x4d */
 613                 {{0, 0},
 614                 {2, 3},
 615                 {6, 6},
 616                 {0, 0}
 617                 }
 618         },
 619         {0, 0, 2, 0,            /* 0x4e */
 620                 {{1, 3},
 621                 {6, 6},
 622                 {0, 0},
 623                 {0, 0}
 624                 }
 625         },
 626         {1, 0, 2, 0,            /* 0x4f */
 627                 {{0, 3},
 628                 {6, 6},
 629                 {0, 0},
 630                 {0, 0}
 631                 }
 632         },
 633         {0, 0, 2, 0,            /* 0x50 */
 634                 {{4, 4},
 635                 {6, 6},
 636                 {0, 0},
 637                 {0, 0}
 638                 }
 639         },
 640         {1, 0, 3, 0,            /* 0x51 */
 641                 {{0, 0},
 642                 {4, 4},
 643                 {6, 6},
 644                 {0, 0}
 645                 }
 646         },
 647         {0, 0, 3, 0,            /* 0x52 */
 648                 {{1, 1},
 649                 {4, 4},
 650                 {6, 6},
 651                 {0, 0}
 652                 }
 653         },
 654         {1, 0, 3, 0,            /* 0x53 */
 655                 {{0, 1},
 656                 {4, 4},
 657                 {6, 6},
 658                 {0, 0}
 659                 }
 660         },
 661         {0, 0, 3, 0,            /* 0x54 */
 662                 {{2, 2},
 663                 {4, 4},
 664                 {6, 6},
 665                 {0, 0}
 666                 }
 667         },
 668         {1, 0, 4, 0,            /* 0x55 */
 669                 {{0, 0},
 670                 {2, 2},
 671                 {4, 4},
 672                 {6, 6}
 673                 }
 674         },
 675         {0, 0, 3, 0,            /* 0x56 */
 676                 {{1, 2},
 677                 {4, 4},
 678                 {6, 6},
 679                 {0, 0}
 680                 }
 681         },
 682         {1, 0, 3, 0,            /* 0x57 */
 683                 {{0, 2},
 684                 {4, 4},
 685                 {6, 6},
 686                 {0, 0}
 687                 }
 688         },
 689         {0, 0, 2, 0,            /* 0x58 */
 690                 {{3, 4},
 691                 {6, 6},
 692                 {0, 0},
 693                 {0, 0}
 694                 }
 695         },
 696         {1, 0, 3, 0,            /* 0x59 */
 697                 {{0, 0},
 698                 {3, 4},
 699                 {6, 6},
 700                 {0, 0}
 701                 }
 702         },
 703         {0, 0, 3, 0,            /* 0x5a */
 704                 {{1, 1},
 705                 {3, 4},
 706                 {6, 6},
 707                 {0, 0}
 708                 }
 709         },
 710         {1, 0, 3, 0,            /* 0x5b */
 711                 {{0, 1},
 712                 {3, 4},
 713                 {6, 6},
 714                 {0, 0}
 715                 }
 716         },
 717         {0, 0, 2, 0,            /* 0x5c */
 718                 {{2, 4},
 719                 {6, 6},
 720                 {0, 0},
 721                 {0, 0}
 722                 }
 723         },
 724         {1, 0, 3, 0,            /* 0x5d */
 725                 {{0, 0},
 726                 {2, 4},
 727                 {6, 6},
 728                 {0, 0}
 729                 }
 730         },
 731         {0, 0, 2, 0,            /* 0x5e */
 732                 {{1, 4},
 733                 {6, 6},
 734                 {0, 0},
 735                 {0, 0}
 736                 }
 737         },
 738         {1, 0, 2, 0,            /* 0x5f */
 739                 {{0, 4},
 740                 {6, 6},
 741                 {0, 0},
 742                 {0, 0}
 743                 }
 744         },
 745         {0, 0, 1, 0,            /* 0x60 */
 746                 {{5, 6},
 747                 {0, 0},
 748                 {0, 0},
 749                 {0, 0}
 750                 }
 751         },
 752         {1, 0, 2, 0,            /* 0x61 */
 753                 {{0, 0},
 754                 {5, 6},
 755                 {0, 0},
 756                 {0, 0}
 757                 }
 758         },
 759         {0, 0, 2, 0,            /* 0x62 */
 760                 {{1, 1},
 761                 {5, 6},
 762                 {0, 0},
 763                 {0, 0}
 764                 }
 765         },
 766         {1, 0, 2, 0,            /* 0x63 */
 767                 {{0, 1},
 768                 {5, 6},
 769                 {0, 0},
 770                 {0, 0}
 771                 }
 772         },
 773         {0, 0, 2, 0,            /* 0x64 */
 774                 {{2, 2},
 775                 {5, 6},
 776                 {0, 0},
 777                 {0, 0}
 778                 }
 779         },
 780         {1, 0, 3, 0,            /* 0x65 */
 781                 {{0, 0},
 782                 {2, 2},
 783                 {5, 6},
 784                 {0, 0}
 785                 }
 786         },
 787         {0, 0, 2, 0,            /* 0x66 */
 788                 {{1, 2},
 789                 {5, 6},
 790                 {0, 0},
 791                 {0, 0}
 792                 }
 793         },
 794         {1, 0, 2, 0,            /* 0x67 */
 795                 {{0, 2},
 796                 {5, 6},
 797                 {0, 0},
 798                 {0, 0}
 799                 }
 800         },
 801         {0, 0, 2, 0,            /* 0x68 */
 802                 {{3, 3},
 803                 {5, 6},
 804                 {0, 0},
 805                 {0, 0}
 806                 }
 807         },
 808         {1, 0, 3, 0,            /* 0x69 */
 809                 {{0, 0},
 810                 {3, 3},
 811                 {5, 6},
 812                 {0, 0}
 813                 }
 814         },
 815         {0, 0, 3, 0,            /* 0x6a */
 816                 {{1, 1},
 817                 {3, 3},
 818                 {5, 6},
 819                 {0, 0}
 820                 }
 821         },
 822         {1, 0, 3, 0,            /* 0x6b */
 823                 {{0, 1},
 824                 {3, 3},
 825                 {5, 6},
 826                 {0, 0}
 827                 }
 828         },
 829         {0, 0, 2, 0,            /* 0x6c */
 830                 {{2, 3},
 831                 {5, 6},
 832                 {0, 0},
 833                 {0, 0}
 834                 }
 835         },
 836         {1, 0, 3, 0,            /* 0x6d */
 837                 {{0, 0},
 838                 {2, 3},
 839                 {5, 6},
 840                 {0, 0}
 841                 }
 842         },
 843         {0, 0, 2, 0,            /* 0x6e */
 844                 {{1, 3},
 845                 {5, 6},
 846                 {0, 0},
 847                 {0, 0}
 848                 }
 849         },
 850         {1, 0, 2, 0,            /* 0x6f */
 851                 {{0, 3},
 852                 {5, 6},
 853                 {0, 0},
 854                 {0, 0}
 855                 }
 856         },
 857         {0, 0, 1, 0,            /* 0x70 */
 858                 {{4, 6},
 859                 {0, 0},
 860                 {0, 0},
 861                 {0, 0}
 862                 }
 863         },
 864         {1, 0, 2, 0,            /* 0x71 */
 865                 {{0, 0},
 866                 {4, 6},
 867                 {0, 0},
 868                 {0, 0}
 869                 }
 870         },
 871         {0, 0, 2, 0,            /* 0x72 */
 872                 {{1, 1},
 873                 {4, 6},
 874                 {0, 0},
 875                 {0, 0}
 876                 }
 877         },
 878         {1, 0, 2, 0,            /* 0x73 */
 879                 {{0, 1},
 880                 {4, 6},
 881                 {0, 0},
 882                 {0, 0}
 883                 }
 884         },
 885         {0, 0, 2, 0,            /* 0x74 */
 886                 {{2, 2},
 887                 {4, 6},
 888                 {0, 0},
 889                 {0, 0}
 890                 }
 891         },
 892         {1, 0, 3, 0,            /* 0x75 */
 893                 {{0, 0},
 894                 {2, 2},
 895                 {4, 6},
 896                 {0, 0}
 897                 }
 898         },
 899         {0, 0, 2, 0,            /* 0x76 */
 900                 {{1, 2},
 901                 {4, 6},
 902                 {0, 0},
 903                 {0, 0}
 904                 }
 905         },
 906         {1, 0, 2, 0,            /* 0x77 */
 907                 {{0, 2},
 908                 {4, 6},
 909                 {0, 0},
 910                 {0, 0}
 911                 }
 912         },
 913         {0, 0, 1, 0,            /* 0x78 */
 914                 {{3, 6},
 915                 {0, 0},
 916                 {0, 0},
 917                 {0, 0}
 918                 }
 919         },
 920         {1, 0, 2, 0,            /* 0x79 */
 921                 {{0, 0},
 922                 {3, 6},
 923                 {0, 0},
 924                 {0, 0}
 925                 }
 926         },
 927         {0, 0, 2, 0,            /* 0x7a */
 928                 {{1, 1},
 929                 {3, 6},
 930                 {0, 0},
 931                 {0, 0}
 932                 }
 933         },
 934         {1, 0, 2, 0,            /* 0x7b */
 935                 {{0, 1},
 936                 {3, 6},
 937                 {0, 0},
 938                 {0, 0}
 939                 }
 940         },
 941         {0, 0, 1, 0,            /* 0x7c */
 942                 {{2, 6},
 943                 {0, 0},
 944                 {0, 0},
 945                 {0, 0}
 946                 }
 947         },
 948         {1, 0, 2, 0,            /* 0x7d */
 949                 {{0, 0},
 950                 {2, 6},
 951                 {0, 0},
 952                 {0, 0}
 953                 }
 954         },
 955         {0, 0, 1, 0,            /* 0x7e */
 956                 {{1, 6},
 957                 {0, 0},
 958                 {0, 0},
 959                 {0, 0}
 960                 }
 961         },
 962         {1, 0, 1, 0,            /* 0x7f */
 963                 {{0, 6},
 964                 {0, 0},
 965                 {0, 0},
 966                 {0, 0}
 967                 }
 968         },
 969         {0, 1, 1, 0,            /* 0x80 */
 970                 {{7, 7},
 971                 {0, 0},
 972                 {0, 0},
 973                 {0, 0}
 974                 }
 975         },
 976         {1, 1, 2, 0,            /* 0x81 */
 977                 {{0, 0},
 978                 {7, 7},
 979                 {0, 0},
 980                 {0, 0}
 981                 }
 982         },
 983         {0, 1, 2, 0,            /* 0x82 */
 984                 {{1, 1},
 985                 {7, 7},
 986                 {0, 0},
 987                 {0, 0}
 988                 }
 989         },
 990         {1, 1, 2, 0,            /* 0x83 */
 991                 {{0, 1},
 992                 {7, 7},
 993                 {0, 0},
 994                 {0, 0}
 995                 }
 996         },
 997         {0, 1, 2, 0,            /* 0x84 */
 998                 {{2, 2},
 999                 {7, 7},
1000                 {0, 0},
1001                 {0, 0}
1002                 }
1003         },
1004         {1, 1, 3, 0,            /* 0x85 */
1005                 {{0, 0},
1006                 {2, 2},
1007                 {7, 7},
1008                 {0, 0}
1009                 }
1010         },
1011         {0, 1, 2, 0,            /* 0x86 */
1012                 {{1, 2},
1013                 {7, 7},
1014                 {0, 0},
1015                 {0, 0}
1016                 }
1017         },
1018         {1, 1, 2, 0,            /* 0x87 */
1019                 {{0, 2},
1020                 {7, 7},
1021                 {0, 0},
1022                 {0, 0}
1023                 }
1024         },
1025         {0, 1, 2, 0,            /* 0x88 */
1026                 {{3, 3},
1027                 {7, 7},
1028                 {0, 0},
1029                 {0, 0}
1030                 }
1031         },
1032         {1, 1, 3, 0,            /* 0x89 */
1033                 {{0, 0},
1034                 {3, 3},
1035                 {7, 7},
1036                 {0, 0}
1037                 }
1038         },
1039         {0, 1, 3, 0,            /* 0x8a */
1040                 {{1, 1},
1041                 {3, 3},
1042                 {7, 7},
1043                 {0, 0}
1044                 }
1045         },
1046         {1, 1, 3, 0,            /* 0x8b */
1047                 {{0, 1},
1048                 {3, 3},
1049                 {7, 7},
1050                 {0, 0}
1051                 }
1052         },
1053         {0, 1, 2, 0,            /* 0x8c */
1054                 {{2, 3},
1055                 {7, 7},
1056                 {0, 0},
1057                 {0, 0}
1058                 }
1059         },
1060         {1, 1, 3, 0,            /* 0x8d */
1061                 {{0, 0},
1062                 {2, 3},
1063                 {7, 7},
1064                 {0, 0}
1065                 }
1066         },
1067         {0, 1, 2, 0,            /* 0x8e */
1068                 {{1, 3},
1069                 {7, 7},
1070                 {0, 0},
1071                 {0, 0}
1072                 }
1073         },
1074         {1, 1, 2, 0,            /* 0x8f */
1075                 {{0, 3},
1076                 {7, 7},
1077                 {0, 0},
1078                 {0, 0}
1079                 }
1080         },
1081         {0, 1, 2, 0,            /* 0x90 */
1082                 {{4, 4},
1083                 {7, 7},
1084                 {0, 0},
1085                 {0, 0}
1086                 }
1087         },
1088         {1, 1, 3, 0,            /* 0x91 */
1089                 {{0, 0},
1090                 {4, 4},
1091                 {7, 7},
1092                 {0, 0}
1093                 }
1094         },
1095         {0, 1, 3, 0,            /* 0x92 */
1096                 {{1, 1},
1097                 {4, 4},
1098                 {7, 7},
1099                 {0, 0}
1100                 }
1101         },
1102         {1, 1, 3, 0,            /* 0x93 */
1103                 {{0, 1},
1104                 {4, 4},
1105                 {7, 7},
1106                 {0, 0}
1107                 }
1108         },
1109         {0, 1, 3, 0,            /* 0x94 */
1110                 {{2, 2},
1111                 {4, 4},
1112                 {7, 7},
1113                 {0, 0}
1114                 }
1115         },
1116         {1, 1, 4, 0,            /* 0x95 */
1117                 {{0, 0},
1118                 {2, 2},
1119                 {4, 4},
1120                 {7, 7}
1121                 }
1122         },
1123         {0, 1, 3, 0,            /* 0x96 */
1124                 {{1, 2},
1125                 {4, 4},
1126                 {7, 7},
1127                 {0, 0}
1128                 }
1129         },
1130         {1, 1, 3, 0,            /* 0x97 */
1131                 {{0, 2},
1132                 {4, 4},
1133                 {7, 7},
1134                 {0, 0}
1135                 }
1136         },
1137         {0, 1, 2, 0,            /* 0x98 */
1138                 {{3, 4},
1139                 {7, 7},
1140                 {0, 0},
1141                 {0, 0}
1142                 }
1143         },
1144         {1, 1, 3, 0,            /* 0x99 */
1145                 {{0, 0},
1146                 {3, 4},
1147                 {7, 7},
1148                 {0, 0}
1149                 }
1150         },
1151         {0, 1, 3, 0,            /* 0x9a */
1152                 {{1, 1},
1153                 {3, 4},
1154                 {7, 7},
1155                 {0, 0}
1156                 }
1157         },
1158         {1, 1, 3, 0,            /* 0x9b */
1159                 {{0, 1},
1160                 {3, 4},
1161                 {7, 7},
1162                 {0, 0}
1163                 }
1164         },
1165         {0, 1, 2, 0,            /* 0x9c */
1166                 {{2, 4},
1167                 {7, 7},
1168                 {0, 0},
1169                 {0, 0}
1170                 }
1171         },
1172         {1, 1, 3, 0,            /* 0x9d */
1173                 {{0, 0},
1174                 {2, 4},
1175                 {7, 7},
1176                 {0, 0}
1177                 }
1178         },
1179         {0, 1, 2, 0,            /* 0x9e */
1180                 {{1, 4},
1181                 {7, 7},
1182                 {0, 0},
1183                 {0, 0}
1184                 }
1185         },
1186         {1, 1, 2, 0,            /* 0x9f */
1187                 {{0, 4},
1188                 {7, 7},
1189                 {0, 0},
1190                 {0, 0}
1191                 }
1192         },
1193         {0, 1, 2, 0,            /* 0xa0 */
1194                 {{5, 5},
1195                 {7, 7},
1196                 {0, 0},
1197                 {0, 0}
1198                 }
1199         },
1200         {1, 1, 3, 0,            /* 0xa1 */
1201                 {{0, 0},
1202                 {5, 5},
1203                 {7, 7},
1204                 {0, 0}
1205                 }
1206         },
1207         {0, 1, 3, 0,            /* 0xa2 */
1208                 {{1, 1},
1209                 {5, 5},
1210                 {7, 7},
1211                 {0, 0}
1212                 }
1213         },
1214         {1, 1, 3, 0,            /* 0xa3 */
1215                 {{0, 1},
1216                 {5, 5},
1217                 {7, 7},
1218                 {0, 0}
1219                 }
1220         },
1221         {0, 1, 3, 0,            /* 0xa4 */
1222                 {{2, 2},
1223                 {5, 5},
1224                 {7, 7},
1225                 {0, 0}
1226                 }
1227         },
1228         {1, 1, 4, 0,            /* 0xa5 */
1229                 {{0, 0},
1230                 {2, 2},
1231                 {5, 5},
1232                 {7, 7}
1233                 }
1234         },
1235         {0, 1, 3, 0,            /* 0xa6 */
1236                 {{1, 2},
1237                 {5, 5},
1238                 {7, 7},
1239                 {0, 0}
1240                 }
1241         },
1242         {1, 1, 3, 0,            /* 0xa7 */
1243                 {{0, 2},
1244                 {5, 5},
1245                 {7, 7},
1246                 {0, 0}
1247                 }
1248         },
1249         {0, 1, 3, 0,            /* 0xa8 */
1250                 {{3, 3},
1251                 {5, 5},
1252                 {7, 7},
1253                 {0, 0}
1254                 }
1255         },
1256         {1, 1, 4, 0,            /* 0xa9 */
1257                 {{0, 0},
1258                 {3, 3},
1259                 {5, 5},
1260                 {7, 7}
1261                 }
1262         },
1263         {0, 1, 4, 0,            /* 0xaa */
1264                 {{1, 1},
1265                 {3, 3},
1266                 {5, 5},
1267                 {7, 7}
1268                 }
1269         },
1270         {1, 1, 4, 0,            /* 0xab */
1271                 {{0, 1},
1272                 {3, 3},
1273                 {5, 5},
1274                 {7, 7}
1275                 }
1276         },
1277         {0, 1, 3, 0,            /* 0xac */
1278                 {{2, 3},
1279                 {5, 5},
1280                 {7, 7},
1281                 {0, 0}
1282                 }
1283         },
1284         {1, 1, 4, 0,            /* 0xad */
1285                 {{0, 0},
1286                 {2, 3},
1287                 {5, 5},
1288                 {7, 7}
1289                 }
1290         },
1291         {0, 1, 3, 0,            /* 0xae */
1292                 {{1, 3},
1293                 {5, 5},
1294                 {7, 7},
1295                 {0, 0}
1296                 }
1297         },
1298         {1, 1, 3, 0,            /* 0xaf */
1299                 {{0, 3},
1300                 {5, 5},
1301                 {7, 7},
1302                 {0, 0}
1303                 }
1304         },
1305         {0, 1, 2, 0,            /* 0xb0 */
1306                 {{4, 5},
1307                 {7, 7},
1308                 {0, 0},
1309                 {0, 0}
1310                 }
1311         },
1312         {1, 1, 3, 0,            /* 0xb1 */
1313                 {{0, 0},
1314                 {4, 5},
1315                 {7, 7},
1316                 {0, 0}
1317                 }
1318         },
1319         {0, 1, 3, 0,            /* 0xb2 */
1320                 {{1, 1},
1321                 {4, 5},
1322                 {7, 7},
1323                 {0, 0}
1324                 }
1325         },
1326         {1, 1, 3, 0,            /* 0xb3 */
1327                 {{0, 1},
1328                 {4, 5},
1329                 {7, 7},
1330                 {0, 0}
1331                 }
1332         },
1333         {0, 1, 3, 0,            /* 0xb4 */
1334                 {{2, 2},
1335                 {4, 5},
1336                 {7, 7},
1337                 {0, 0}
1338                 }
1339         },
1340         {1, 1, 4, 0,            /* 0xb5 */
1341                 {{0, 0},
1342                 {2, 2},
1343                 {4, 5},
1344                 {7, 7}
1345                 }
1346         },
1347         {0, 1, 3, 0,            /* 0xb6 */
1348                 {{1, 2},
1349                 {4, 5},
1350                 {7, 7},
1351                 {0, 0}
1352                 }
1353         },
1354         {1, 1, 3, 0,            /* 0xb7 */
1355                 {{0, 2},
1356                 {4, 5},
1357                 {7, 7},
1358                 {0, 0}
1359                 }
1360         },
1361         {0, 1, 2, 0,            /* 0xb8 */
1362                 {{3, 5},
1363                 {7, 7},
1364                 {0, 0},
1365                 {0, 0}
1366                 }
1367         },
1368         {1, 1, 3, 0,            /* 0xb9 */
1369                 {{0, 0},
1370                 {3, 5},
1371                 {7, 7},
1372                 {0, 0}
1373                 }
1374         },
1375         {0, 1, 3, 0,            /* 0xba */
1376                 {{1, 1},
1377                 {3, 5},
1378                 {7, 7},
1379                 {0, 0}
1380                 }
1381         },
1382         {1, 1, 3, 0,            /* 0xbb */
1383                 {{0, 1},
1384                 {3, 5},
1385                 {7, 7},
1386                 {0, 0}
1387                 }
1388         },
1389         {0, 1, 2, 0,            /* 0xbc */
1390                 {{2, 5},
1391                 {7, 7},
1392                 {0, 0},
1393                 {0, 0}
1394                 }
1395         },
1396         {1, 1, 3, 0,            /* 0xbd */
1397                 {{0, 0},
1398                 {2, 5},
1399                 {7, 7},
1400                 {0, 0}
1401                 }
1402         },
1403         {0, 1, 2, 0,            /* 0xbe */
1404                 {{1, 5},
1405                 {7, 7},
1406                 {0, 0},
1407                 {0, 0}
1408                 }
1409         },
1410         {1, 1, 2, 0,            /* 0xbf */
1411                 {{0, 5},
1412                 {7, 7},
1413                 {0, 0},
1414                 {0, 0}
1415                 }
1416         },
1417         {0, 1, 1, 0,            /* 0xc0 */
1418                 {{6, 7},
1419                 {0, 0},
1420                 {0, 0},
1421                 {0, 0}
1422                 }
1423         },
1424         {1, 1, 2, 0,            /* 0xc1 */
1425                 {{0, 0},
1426                 {6, 7},
1427                 {0, 0},
1428                 {0, 0}
1429                 }
1430         },
1431         {0, 1, 2, 0,            /* 0xc2 */
1432                 {{1, 1},
1433                 {6, 7},
1434                 {0, 0},
1435                 {0, 0}
1436                 }
1437         },
1438         {1, 1, 2, 0,            /* 0xc3 */
1439                 {{0, 1},
1440                 {6, 7},
1441                 {0, 0},
1442                 {0, 0}
1443                 }
1444         },
1445         {0, 1, 2, 0,            /* 0xc4 */
1446                 {{2, 2},
1447                 {6, 7},
1448                 {0, 0},
1449                 {0, 0}
1450                 }
1451         },
1452         {1, 1, 3, 0,            /* 0xc5 */
1453                 {{0, 0},
1454                 {2, 2},
1455                 {6, 7},
1456                 {0, 0}
1457                 }
1458         },
1459         {0, 1, 2, 0,            /* 0xc6 */
1460                 {{1, 2},
1461                 {6, 7},
1462                 {0, 0},
1463                 {0, 0}
1464                 }
1465         },
1466         {1, 1, 2, 0,            /* 0xc7 */
1467                 {{0, 2},
1468                 {6, 7},
1469                 {0, 0},
1470                 {0, 0}
1471                 }
1472         },
1473         {0, 1, 2, 0,            /* 0xc8 */
1474                 {{3, 3},
1475                 {6, 7},
1476                 {0, 0},
1477                 {0, 0}
1478                 }
1479         },
1480         {1, 1, 3, 0,            /* 0xc9 */
1481                 {{0, 0},
1482                 {3, 3},
1483                 {6, 7},
1484                 {0, 0}
1485                 }
1486         },
1487         {0, 1, 3, 0,            /* 0xca */
1488                 {{1, 1},
1489                 {3, 3},
1490                 {6, 7},
1491                 {0, 0}
1492                 }
1493         },
1494         {1, 1, 3, 0,            /* 0xcb */
1495                 {{0, 1},
1496                 {3, 3},
1497                 {6, 7},
1498                 {0, 0}
1499                 }
1500         },
1501         {0, 1, 2, 0,            /* 0xcc */
1502                 {{2, 3},
1503                 {6, 7},
1504                 {0, 0},
1505                 {0, 0}
1506                 }
1507         },
1508         {1, 1, 3, 0,            /* 0xcd */
1509                 {{0, 0},
1510                 {2, 3},
1511                 {6, 7},
1512                 {0, 0}
1513                 }
1514         },
1515         {0, 1, 2, 0,            /* 0xce */
1516                 {{1, 3},
1517                 {6, 7},
1518                 {0, 0},
1519                 {0, 0}
1520                 }
1521         },
1522         {1, 1, 2, 0,            /* 0xcf */
1523                 {{0, 3},
1524                 {6, 7},
1525                 {0, 0},
1526                 {0, 0}
1527                 }
1528         },
1529         {0, 1, 2, 0,            /* 0xd0 */
1530                 {{4, 4},
1531                 {6, 7},
1532                 {0, 0},
1533                 {0, 0}
1534                 }
1535         },
1536         {1, 1, 3, 0,            /* 0xd1 */
1537                 {{0, 0},
1538                 {4, 4},
1539                 {6, 7},
1540                 {0, 0}
1541                 }
1542         },
1543         {0, 1, 3, 0,            /* 0xd2 */
1544                 {{1, 1},
1545                 {4, 4},
1546                 {6, 7},
1547                 {0, 0}
1548                 }
1549         },
1550         {1, 1, 3, 0,            /* 0xd3 */
1551                 {{0, 1},
1552                 {4, 4},
1553                 {6, 7},
1554                 {0, 0}
1555                 }
1556         },
1557         {0, 1, 3, 0,            /* 0xd4 */
1558                 {{2, 2},
1559                 {4, 4},
1560                 {6, 7},
1561                 {0, 0}
1562                 }
1563         },
1564         {1, 1, 4, 0,            /* 0xd5 */
1565                 {{0, 0},
1566                 {2, 2},
1567                 {4, 4},
1568                 {6, 7}
1569                 }
1570         },
1571         {0, 1, 3, 0,            /* 0xd6 */
1572                 {{1, 2},
1573                 {4, 4},
1574                 {6, 7},
1575                 {0, 0}
1576                 }
1577         },
1578         {1, 1, 3, 0,            /* 0xd7 */
1579                 {{0, 2},
1580                 {4, 4},
1581                 {6, 7},
1582                 {0, 0}
1583                 }
1584         },
1585         {0, 1, 2, 0,            /* 0xd8 */
1586                 {{3, 4},
1587                 {6, 7},
1588                 {0, 0},
1589                 {0, 0}
1590                 }
1591         },
1592         {1, 1, 3, 0,            /* 0xd9 */
1593                 {{0, 0},
1594                 {3, 4},
1595                 {6, 7},
1596                 {0, 0}
1597                 }
1598         },
1599         {0, 1, 3, 0,            /* 0xda */
1600                 {{1, 1},
1601                 {3, 4},
1602                 {6, 7},
1603                 {0, 0}
1604                 }
1605         },
1606         {1, 1, 3, 0,            /* 0xdb */
1607                 {{0, 1},
1608                 {3, 4},
1609                 {6, 7},
1610                 {0, 0}
1611                 }
1612         },
1613         {0, 1, 2, 0,            /* 0xdc */
1614                 {{2, 4},
1615                 {6, 7},
1616                 {0, 0},
1617                 {0, 0}
1618                 }
1619         },
1620         {1, 1, 3, 0,            /* 0xdd */
1621                 {{0, 0},
1622                 {2, 4},
1623                 {6, 7},
1624                 {0, 0}
1625                 }
1626         },
1627         {0, 1, 2, 0,            /* 0xde */
1628                 {{1, 4},
1629                 {6, 7},
1630                 {0, 0},
1631                 {0, 0}
1632                 }
1633         },
1634         {1, 1, 2, 0,            /* 0xdf */
1635                 {{0, 4},
1636                 {6, 7},
1637                 {0, 0},
1638                 {0, 0}
1639                 }
1640         },
1641         {0, 1, 1, 0,            /* 0xe0 */
1642                 {{5, 7},
1643                 {0, 0},
1644                 {0, 0},
1645                 {0, 0}
1646                 }
1647         },
1648         {1, 1, 2, 0,            /* 0xe1 */
1649                 {{0, 0},
1650                 {5, 7},
1651                 {0, 0},
1652                 {0, 0}
1653                 }
1654         },
1655         {0, 1, 2, 0,            /* 0xe2 */
1656                 {{1, 1},
1657                 {5, 7},
1658                 {0, 0},
1659                 {0, 0}
1660                 }
1661         },
1662         {1, 1, 2, 0,            /* 0xe3 */
1663                 {{0, 1},
1664                 {5, 7},
1665                 {0, 0},
1666                 {0, 0}
1667                 }
1668         },
1669         {0, 1, 2, 0,            /* 0xe4 */
1670                 {{2, 2},
1671                 {5, 7},
1672                 {0, 0},
1673                 {0, 0}
1674                 }
1675         },
1676         {1, 1, 3, 0,            /* 0xe5 */
1677                 {{0, 0},
1678                 {2, 2},
1679                 {5, 7},
1680                 {0, 0}
1681                 }
1682         },
1683         {0, 1, 2, 0,            /* 0xe6 */
1684                 {{1, 2},
1685                 {5, 7},
1686                 {0, 0},
1687                 {0, 0}
1688                 }
1689         },
1690         {1, 1, 2, 0,            /* 0xe7 */
1691                 {{0, 2},
1692                 {5, 7},
1693                 {0, 0},
1694                 {0, 0}
1695                 }
1696         },
1697         {0, 1, 2, 0,            /* 0xe8 */
1698                 {{3, 3},
1699                 {5, 7},
1700                 {0, 0},
1701                 {0, 0}
1702                 }
1703         },
1704         {1, 1, 3, 0,            /* 0xe9 */
1705                 {{0, 0},
1706                 {3, 3},
1707                 {5, 7},
1708                 {0, 0}
1709                 }
1710         },
1711         {0, 1, 3, 0,            /* 0xea */
1712                 {{1, 1},
1713                 {3, 3},
1714                 {5, 7},
1715                 {0, 0}
1716                 }
1717         },
1718         {1, 1, 3, 0,            /* 0xeb */
1719                 {{0, 1},
1720                 {3, 3},
1721                 {5, 7},
1722                 {0, 0}
1723                 }
1724         },
1725         {0, 1, 2, 0,            /* 0xec */
1726                 {{2, 3},
1727                 {5, 7},
1728                 {0, 0},
1729                 {0, 0}
1730                 }
1731         },
1732         {1, 1, 3, 0,            /* 0xed */
1733                 {{0, 0},
1734                 {2, 3},
1735                 {5, 7},
1736                 {0, 0}
1737                 }
1738         },
1739         {0, 1, 2, 0,            /* 0xee */
1740                 {{1, 3},
1741                 {5, 7},
1742                 {0, 0},
1743                 {0, 0}
1744                 }
1745         },
1746         {1, 1, 2, 0,            /* 0xef */
1747                 {{0, 3},
1748                 {5, 7},
1749                 {0, 0},
1750                 {0, 0}
1751                 }
1752         },
1753         {0, 1, 1, 0,            /* 0xf0 */
1754                 {{4, 7},
1755                 {0, 0},
1756                 {0, 0},
1757                 {0, 0}
1758                 }
1759         },
1760         {1, 1, 2, 0,            /* 0xf1 */
1761                 {{0, 0},
1762                 {4, 7},
1763                 {0, 0},
1764                 {0, 0}
1765                 }
1766         },
1767         {0, 1, 2, 0,            /* 0xf2 */
1768                 {{1, 1},
1769                 {4, 7},
1770                 {0, 0},
1771                 {0, 0}
1772                 }
1773         },
1774         {1, 1, 2, 0,            /* 0xf3 */
1775                 {{0, 1},
1776                 {4, 7},
1777                 {0, 0},
1778                 {0, 0}
1779                 }
1780         },
1781         {0, 1, 2, 0,            /* 0xf4 */
1782                 {{2, 2},
1783                 {4, 7},
1784                 {0, 0},
1785                 {0, 0}
1786                 }
1787         },
1788         {1, 1, 3, 0,            /* 0xf5 */
1789                 {{0, 0},
1790                 {2, 2},
1791                 {4, 7},
1792                 {0, 0}
1793                 }
1794         },
1795         {0, 1, 2, 0,            /* 0xf6 */
1796                 {{1, 2},
1797                 {4, 7},
1798                 {0, 0},
1799                 {0, 0}
1800                 }
1801         },
1802         {1, 1, 2, 0,            /* 0xf7 */
1803                 {{0, 2},
1804                 {4, 7},
1805                 {0, 0},
1806                 {0, 0}
1807                 }
1808         },
1809         {0, 1, 1, 0,            /* 0xf8 */
1810                 {{3, 7},
1811                 {0, 0},
1812                 {0, 0},
1813                 {0, 0}
1814                 }
1815         },
1816         {1, 1, 2, 0,            /* 0xf9 */
1817                 {{0, 0},
1818                 {3, 7},
1819                 {0, 0},
1820                 {0, 0}
1821                 }
1822         },
1823         {0, 1, 2, 0,            /* 0xfa */
1824                 {{1, 1},
1825                 {3, 7},
1826                 {0, 0},
1827                 {0, 0}
1828                 }
1829         },
1830         {1, 1, 2, 0,            /* 0xfb */
1831                 {{0, 1},
1832                 {3, 7},
1833                 {0, 0},
1834                 {0, 0}
1835                 }
1836         },
1837         {0, 1, 1, 0,            /* 0xfc */
1838                 {{2, 7},
1839                 {0, 0},
1840                 {0, 0},
1841                 {0, 0}
1842                 }
1843         },
1844         {1, 1, 2, 0,            /* 0xfd */
1845                 {{0, 0},
1846                 {2, 7},
1847                 {0, 0},
1848                 {0, 0}
1849                 }
1850         },
1851         {0, 1, 1, 0,            /* 0xfe */
1852                 {{1, 7},
1853                 {0, 0},
1854                 {0, 0},
1855                 {0, 0}
1856                 }
1857         },
1858         {1, 1, 1, 0,            /* 0xff */
1859                 {{0, 7},
1860                 {0, 0},
1861                 {0, 0},
1862                 {0, 0}
1863                 }
1864         }
1865 };
1866
1867
1868 int
1869 sctp_is_address_in_scope(struct sctp_ifa *ifa,
1870     struct sctp_scoping *scope,
1871     int do_update)
1872 {
1873         if ((scope->loopback_scope == 0) &&
1874             (ifa->ifn_p) && SCTP_IFN_IS_IFT_LOOP(ifa->ifn_p)) {
1875                 /*
1876                  * skip loopback if not in scope *
1877                  */
1878                 return (0);
1879         }
1880         switch (ifa->address.sa.sa_family) {
1881 #ifdef INET
1882         case AF_INET:
1883                 if (scope->ipv4_addr_legal) {
1884                         struct sockaddr_in *sin;
1885
1886                         sin = &ifa->address.sin;
1887                         if (sin->sin_addr.s_addr == 0) {
1888                                 /* not in scope , unspecified */
1889                                 return (0);
1890                         }
1891                         if ((scope->ipv4_local_scope == 0) &&
1892                             (IN4_ISPRIVATE_ADDRESS(&sin->sin_addr))) {
1893                                 /* private address not in scope */
1894                                 return (0);
1895                         }
1896                 } else {
1897                         return (0);
1898                 }
1899                 break;
1900 #endif
1901 #ifdef INET6
1902         case AF_INET6:
1903                 if (scope->ipv6_addr_legal) {
1904                         struct sockaddr_in6 *sin6;
1905
1906                         /*
1907                          * Must update the flags,  bummer, which means any
1908                          * IFA locks must now be applied HERE <->
1909                          */
1910                         if (do_update) {
1911                                 sctp_gather_internal_ifa_flags(ifa);
1912                         }
1913                         if (ifa->localifa_flags & SCTP_ADDR_IFA_UNUSEABLE) {
1914                                 return (0);
1915                         }
1916                         /* ok to use deprecated addresses? */
1917                         sin6 = &ifa->address.sin6;
1918                         if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) {
1919                                 /* skip unspecifed addresses */
1920                                 return (0);
1921                         }
1922                         if (    /* (local_scope == 0) && */
1923                             (IN6_IS_ADDR_LINKLOCAL(&sin6->sin6_addr))) {
1924                                 return (0);
1925                         }
1926                         if ((scope->site_scope == 0) &&
1927                             (IN6_IS_ADDR_SITELOCAL(&sin6->sin6_addr))) {
1928                                 return (0);
1929                         }
1930                 } else {
1931                         return (0);
1932                 }
1933                 break;
1934 #endif
1935         default:
1936                 return (0);
1937         }
1938         return (1);
1939 }
1940
1941 static struct mbuf *
1942 sctp_add_addr_to_mbuf(struct mbuf *m, struct sctp_ifa *ifa, uint16_t *len)
1943 {
1944 #if defined(INET) || defined(INET6)
1945         struct sctp_paramhdr *paramh;
1946         struct mbuf *mret;
1947         uint16_t plen;
1948 #endif
1949
1950         switch (ifa->address.sa.sa_family) {
1951 #ifdef INET
1952         case AF_INET:
1953                 plen = (uint16_t)sizeof(struct sctp_ipv4addr_param);
1954                 break;
1955 #endif
1956 #ifdef INET6
1957         case AF_INET6:
1958                 plen = (uint16_t)sizeof(struct sctp_ipv6addr_param);
1959                 break;
1960 #endif
1961         default:
1962                 return (m);
1963         }
1964 #if defined(INET) || defined(INET6)
1965         if (M_TRAILINGSPACE(m) >= plen) {
1966                 /* easy side we just drop it on the end */
1967                 paramh = (struct sctp_paramhdr *)(SCTP_BUF_AT(m, SCTP_BUF_LEN(m)));
1968                 mret = m;
1969         } else {
1970                 /* Need more space */
1971                 mret = m;
1972                 while (SCTP_BUF_NEXT(mret) != NULL) {
1973                         mret = SCTP_BUF_NEXT(mret);
1974                 }
1975                 SCTP_BUF_NEXT(mret) = sctp_get_mbuf_for_msg(plen, 0, M_NOWAIT, 1, MT_DATA);
1976                 if (SCTP_BUF_NEXT(mret) == NULL) {
1977                         /* We are hosed, can't add more addresses */
1978                         return (m);
1979                 }
1980                 mret = SCTP_BUF_NEXT(mret);
1981                 paramh = mtod(mret, struct sctp_paramhdr *);
1982         }
1983         /* now add the parameter */
1984         switch (ifa->address.sa.sa_family) {
1985 #ifdef INET
1986         case AF_INET:
1987                 {
1988                         struct sctp_ipv4addr_param *ipv4p;
1989                         struct sockaddr_in *sin;
1990
1991                         sin = &ifa->address.sin;
1992                         ipv4p = (struct sctp_ipv4addr_param *)paramh;
1993                         paramh->param_type = htons(SCTP_IPV4_ADDRESS);
1994                         paramh->param_length = htons(plen);
1995                         ipv4p->addr = sin->sin_addr.s_addr;
1996                         SCTP_BUF_LEN(mret) += plen;
1997                         break;
1998                 }
1999 #endif
2000 #ifdef INET6
2001         case AF_INET6:
2002                 {
2003                         struct sctp_ipv6addr_param *ipv6p;
2004                         struct sockaddr_in6 *sin6;
2005
2006                         sin6 = &ifa->address.sin6;
2007                         ipv6p = (struct sctp_ipv6addr_param *)paramh;
2008                         paramh->param_type = htons(SCTP_IPV6_ADDRESS);
2009                         paramh->param_length = htons(plen);
2010                         memcpy(ipv6p->addr, &sin6->sin6_addr,
2011                             sizeof(ipv6p->addr));
2012                         /* clear embedded scope in the address */
2013                         in6_clearscope((struct in6_addr *)ipv6p->addr);
2014                         SCTP_BUF_LEN(mret) += plen;
2015                         break;
2016                 }
2017 #endif
2018         default:
2019                 return (m);
2020         }
2021         if (len != NULL) {
2022                 *len += plen;
2023         }
2024         return (mret);
2025 #endif
2026 }
2027
2028
2029 struct mbuf *
2030 sctp_add_addresses_to_i_ia(struct sctp_inpcb *inp, struct sctp_tcb *stcb,
2031     struct sctp_scoping *scope,
2032     struct mbuf *m_at, int cnt_inits_to,
2033     uint16_t *padding_len, uint16_t *chunk_len)
2034 {
2035         struct sctp_vrf *vrf = NULL;
2036         int cnt, limit_out = 0, total_count;
2037         uint32_t vrf_id;
2038
2039         vrf_id = inp->def_vrf_id;
2040         SCTP_IPI_ADDR_RLOCK();
2041         vrf = sctp_find_vrf(vrf_id);
2042         if (vrf == NULL) {
2043                 SCTP_IPI_ADDR_RUNLOCK();
2044                 return (m_at);
2045         }
2046         if (inp->sctp_flags & SCTP_PCB_FLAGS_BOUNDALL) {
2047                 struct sctp_ifa *sctp_ifap;
2048                 struct sctp_ifn *sctp_ifnp;
2049
2050                 cnt = cnt_inits_to;
2051                 if (vrf->total_ifa_count > SCTP_COUNT_LIMIT) {
2052                         limit_out = 1;
2053                         cnt = SCTP_ADDRESS_LIMIT;
2054                         goto skip_count;
2055                 }
2056                 LIST_FOREACH(sctp_ifnp, &vrf->ifnlist, next_ifn) {
2057                         if ((scope->loopback_scope == 0) &&
2058                             SCTP_IFN_IS_IFT_LOOP(sctp_ifnp)) {
2059                                 /*
2060                                  * Skip loopback devices if loopback_scope
2061                                  * not set
2062                                  */
2063                                 continue;
2064                         }
2065                         LIST_FOREACH(sctp_ifap, &sctp_ifnp->ifalist, next_ifa) {
2066 #ifdef INET
2067                                 if ((sctp_ifap->address.sa.sa_family == AF_INET) &&
2068                                     (prison_check_ip4(inp->ip_inp.inp.inp_cred,
2069                                     &sctp_ifap->address.sin.sin_addr) != 0)) {
2070                                         continue;
2071                                 }
2072 #endif
2073 #ifdef INET6
2074                                 if ((sctp_ifap->address.sa.sa_family == AF_INET6) &&
2075                                     (prison_check_ip6(inp->ip_inp.inp.inp_cred,
2076                                     &sctp_ifap->address.sin6.sin6_addr) != 0)) {
2077                                         continue;
2078                                 }
2079 #endif
2080                                 if (sctp_is_addr_restricted(stcb, sctp_ifap)) {
2081                                         continue;
2082                                 }
2083                                 if (sctp_is_address_in_scope(sctp_ifap, scope, 1) == 0) {
2084                                         continue;
2085                                 }
2086                                 cnt++;
2087                                 if (cnt > SCTP_ADDRESS_LIMIT) {
2088                                         break;
2089                                 }
2090                         }
2091                         if (cnt > SCTP_ADDRESS_LIMIT) {
2092                                 break;
2093                         }
2094                 }
2095 skip_count:
2096                 if (cnt > 1) {
2097                         total_count = 0;
2098                         LIST_FOREACH(sctp_ifnp, &vrf->ifnlist, next_ifn) {
2099                                 cnt = 0;
2100                                 if ((scope->loopback_scope == 0) &&
2101                                     SCTP_IFN_IS_IFT_LOOP(sctp_ifnp)) {
2102                                         /*
2103                                          * Skip loopback devices if
2104                                          * loopback_scope not set
2105                                          */
2106                                         continue;
2107                                 }
2108                                 LIST_FOREACH(sctp_ifap, &sctp_ifnp->ifalist, next_ifa) {
2109 #ifdef INET
2110                                         if ((sctp_ifap->address.sa.sa_family == AF_INET) &&
2111                                             (prison_check_ip4(inp->ip_inp.inp.inp_cred,
2112                                             &sctp_ifap->address.sin.sin_addr) != 0)) {
2113                                                 continue;
2114                                         }
2115 #endif
2116 #ifdef INET6
2117                                         if ((sctp_ifap->address.sa.sa_family == AF_INET6) &&
2118                                             (prison_check_ip6(inp->ip_inp.inp.inp_cred,
2119                                             &sctp_ifap->address.sin6.sin6_addr) != 0)) {
2120                                                 continue;
2121                                         }
2122 #endif
2123                                         if (sctp_is_addr_restricted(stcb, sctp_ifap)) {
2124                                                 continue;
2125                                         }
2126                                         if (sctp_is_address_in_scope(sctp_ifap,
2127                                             scope, 0) == 0) {
2128                                                 continue;
2129                                         }
2130                                         if ((chunk_len != NULL) &&
2131                                             (padding_len != NULL) &&
2132                                             (*padding_len > 0)) {
2133                                                 memset(mtod(m_at, caddr_t)+*chunk_len, 0, *padding_len);
2134                                                 SCTP_BUF_LEN(m_at) += *padding_len;
2135                                                 *chunk_len += *padding_len;
2136                                                 *padding_len = 0;
2137                                         }
2138                                         m_at = sctp_add_addr_to_mbuf(m_at, sctp_ifap, chunk_len);
2139                                         if (limit_out) {
2140                                                 cnt++;
2141                                                 total_count++;
2142                                                 if (cnt >= 2) {
2143                                                         /*
2144                                                          * two from each
2145                                                          * address
2146                                                          */
2147                                                         break;
2148                                                 }
2149                                                 if (total_count > SCTP_ADDRESS_LIMIT) {
2150                                                         /* No more addresses */
2151                                                         break;
2152                                                 }
2153                                         }
2154                                 }
2155                         }
2156                 }
2157         } else {
2158                 struct sctp_laddr *laddr;
2159
2160                 cnt = cnt_inits_to;
2161                 /* First, how many ? */
2162                 LIST_FOREACH(laddr, &inp->sctp_addr_list, sctp_nxt_addr) {
2163                         if (laddr->ifa == NULL) {
2164                                 continue;
2165                         }
2166                         if (laddr->ifa->localifa_flags & SCTP_BEING_DELETED)
2167                                 /*
2168                                  * Address being deleted by the system, dont
2169                                  * list.
2170                                  */
2171                                 continue;
2172                         if (laddr->action == SCTP_DEL_IP_ADDRESS) {
2173                                 /*
2174                                  * Address being deleted on this ep don't
2175                                  * list.
2176                                  */
2177                                 continue;
2178                         }
2179                         if (sctp_is_address_in_scope(laddr->ifa,
2180                             scope, 1) == 0) {
2181                                 continue;
2182                         }
2183                         cnt++;
2184                 }
2185                 /*
2186                  * To get through a NAT we only list addresses if we have
2187                  * more than one. That way if you just bind a single address
2188                  * we let the source of the init dictate our address.
2189                  */
2190                 if (cnt > 1) {
2191                         cnt = cnt_inits_to;
2192                         LIST_FOREACH(laddr, &inp->sctp_addr_list, sctp_nxt_addr) {
2193                                 if (laddr->ifa == NULL) {
2194                                         continue;
2195                                 }
2196                                 if (laddr->ifa->localifa_flags & SCTP_BEING_DELETED) {
2197                                         continue;
2198                                 }
2199                                 if (sctp_is_address_in_scope(laddr->ifa,
2200                                     scope, 0) == 0) {
2201                                         continue;
2202                                 }
2203                                 if ((chunk_len != NULL) &&
2204                                     (padding_len != NULL) &&
2205                                     (*padding_len > 0)) {
2206                                         memset(mtod(m_at, caddr_t)+*chunk_len, 0, *padding_len);
2207                                         SCTP_BUF_LEN(m_at) += *padding_len;
2208                                         *chunk_len += *padding_len;
2209                                         *padding_len = 0;
2210                                 }
2211                                 m_at = sctp_add_addr_to_mbuf(m_at, laddr->ifa, chunk_len);
2212                                 cnt++;
2213                                 if (cnt >= SCTP_ADDRESS_LIMIT) {
2214                                         break;
2215                                 }
2216                         }
2217                 }
2218         }
2219         SCTP_IPI_ADDR_RUNLOCK();
2220         return (m_at);
2221 }
2222
2223 static struct sctp_ifa *
2224 sctp_is_ifa_addr_preferred(struct sctp_ifa *ifa,
2225     uint8_t dest_is_loop,
2226     uint8_t dest_is_priv,
2227     sa_family_t fam)
2228 {
2229         uint8_t dest_is_global = 0;
2230
2231         /* dest_is_priv is true if destination is a private address */
2232         /* dest_is_loop is true if destination is a loopback addresses */
2233
2234         /**
2235          * Here we determine if its a preferred address. A preferred address
2236          * means it is the same scope or higher scope then the destination.
2237          * L = loopback, P = private, G = global
2238          * -----------------------------------------
2239          *    src    |  dest | result
2240          *  ----------------------------------------
2241          *     L     |    L  |    yes
2242          *  -----------------------------------------
2243          *     P     |    L  |    yes-v4 no-v6
2244          *  -----------------------------------------
2245          *     G     |    L  |    yes-v4 no-v6
2246          *  -----------------------------------------
2247          *     L     |    P  |    no
2248          *  -----------------------------------------
2249          *     P     |    P  |    yes
2250          *  -----------------------------------------
2251          *     G     |    P  |    no
2252          *   -----------------------------------------
2253          *     L     |    G  |    no
2254          *   -----------------------------------------
2255          *     P     |    G  |    no
2256          *    -----------------------------------------
2257          *     G     |    G  |    yes
2258          *    -----------------------------------------
2259          */
2260
2261         if (ifa->address.sa.sa_family != fam) {
2262                 /* forget mis-matched family */
2263                 return (NULL);
2264         }
2265         if ((dest_is_priv == 0) && (dest_is_loop == 0)) {
2266                 dest_is_global = 1;
2267         }
2268         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Is destination preferred:");
2269         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, &ifa->address.sa);
2270         /* Ok the address may be ok */
2271 #ifdef INET6
2272         if (fam == AF_INET6) {
2273                 /* ok to use deprecated addresses? no lets not! */
2274                 if (ifa->localifa_flags & SCTP_ADDR_IFA_UNUSEABLE) {
2275                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:1\n");
2276                         return (NULL);
2277                 }
2278                 if (ifa->src_is_priv && !ifa->src_is_loop) {
2279                         if (dest_is_loop) {
2280                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:2\n");
2281                                 return (NULL);
2282                         }
2283                 }
2284                 if (ifa->src_is_glob) {
2285                         if (dest_is_loop) {
2286                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:3\n");
2287                                 return (NULL);
2288                         }
2289                 }
2290         }
2291 #endif
2292         /*
2293          * Now that we know what is what, implement or table this could in
2294          * theory be done slicker (it used to be), but this is
2295          * straightforward and easier to validate :-)
2296          */
2297         SCTPDBG(SCTP_DEBUG_OUTPUT3, "src_loop:%d src_priv:%d src_glob:%d\n",
2298             ifa->src_is_loop, ifa->src_is_priv, ifa->src_is_glob);
2299         SCTPDBG(SCTP_DEBUG_OUTPUT3, "dest_loop:%d dest_priv:%d dest_glob:%d\n",
2300             dest_is_loop, dest_is_priv, dest_is_global);
2301
2302         if ((ifa->src_is_loop) && (dest_is_priv)) {
2303                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:4\n");
2304                 return (NULL);
2305         }
2306         if ((ifa->src_is_glob) && (dest_is_priv)) {
2307                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:5\n");
2308                 return (NULL);
2309         }
2310         if ((ifa->src_is_loop) && (dest_is_global)) {
2311                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:6\n");
2312                 return (NULL);
2313         }
2314         if ((ifa->src_is_priv) && (dest_is_global)) {
2315                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:7\n");
2316                 return (NULL);
2317         }
2318         SCTPDBG(SCTP_DEBUG_OUTPUT3, "YES\n");
2319         /* its a preferred address */
2320         return (ifa);
2321 }
2322
2323 static struct sctp_ifa *
2324 sctp_is_ifa_addr_acceptable(struct sctp_ifa *ifa,
2325     uint8_t dest_is_loop,
2326     uint8_t dest_is_priv,
2327     sa_family_t fam)
2328 {
2329         uint8_t dest_is_global = 0;
2330
2331         /**
2332          * Here we determine if its a acceptable address. A acceptable
2333          * address means it is the same scope or higher scope but we can
2334          * allow for NAT which means its ok to have a global dest and a
2335          * private src.
2336          *
2337          * L = loopback, P = private, G = global
2338          * -----------------------------------------
2339          *  src    |  dest | result
2340          * -----------------------------------------
2341          *   L     |   L   |    yes
2342          *  -----------------------------------------
2343          *   P     |   L   |    yes-v4 no-v6
2344          *  -----------------------------------------
2345          *   G     |   L   |    yes
2346          * -----------------------------------------
2347          *   L     |   P   |    no
2348          * -----------------------------------------
2349          *   P     |   P   |    yes
2350          * -----------------------------------------
2351          *   G     |   P   |    yes - May not work
2352          * -----------------------------------------
2353          *   L     |   G   |    no
2354          * -----------------------------------------
2355          *   P     |   G   |    yes - May not work
2356          * -----------------------------------------
2357          *   G     |   G   |    yes
2358          * -----------------------------------------
2359          */
2360
2361         if (ifa->address.sa.sa_family != fam) {
2362                 /* forget non matching family */
2363                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "ifa_fam:%d fam:%d\n",
2364                     ifa->address.sa.sa_family, fam);
2365                 return (NULL);
2366         }
2367         /* Ok the address may be ok */
2368         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT3, &ifa->address.sa);
2369         SCTPDBG(SCTP_DEBUG_OUTPUT3, "dst_is_loop:%d dest_is_priv:%d\n",
2370             dest_is_loop, dest_is_priv);
2371         if ((dest_is_loop == 0) && (dest_is_priv == 0)) {
2372                 dest_is_global = 1;
2373         }
2374 #ifdef INET6
2375         if (fam == AF_INET6) {
2376                 /* ok to use deprecated addresses? */
2377                 if (ifa->localifa_flags & SCTP_ADDR_IFA_UNUSEABLE) {
2378                         return (NULL);
2379                 }
2380                 if (ifa->src_is_priv) {
2381                         /* Special case, linklocal to loop */
2382                         if (dest_is_loop)
2383                                 return (NULL);
2384                 }
2385         }
2386 #endif
2387         /*
2388          * Now that we know what is what, implement our table. This could in
2389          * theory be done slicker (it used to be), but this is
2390          * straightforward and easier to validate :-)
2391          */
2392         SCTPDBG(SCTP_DEBUG_OUTPUT3, "ifa->src_is_loop:%d dest_is_priv:%d\n",
2393             ifa->src_is_loop,
2394             dest_is_priv);
2395         if ((ifa->src_is_loop == 1) && (dest_is_priv)) {
2396                 return (NULL);
2397         }
2398         SCTPDBG(SCTP_DEBUG_OUTPUT3, "ifa->src_is_loop:%d dest_is_glob:%d\n",
2399             ifa->src_is_loop,
2400             dest_is_global);
2401         if ((ifa->src_is_loop == 1) && (dest_is_global)) {
2402                 return (NULL);
2403         }
2404         SCTPDBG(SCTP_DEBUG_OUTPUT3, "address is acceptable\n");
2405         /* its an acceptable address */
2406         return (ifa);
2407 }
2408
2409 int
2410 sctp_is_addr_restricted(struct sctp_tcb *stcb, struct sctp_ifa *ifa)
2411 {
2412         struct sctp_laddr *laddr;
2413
2414         if (stcb == NULL) {
2415                 /* There are no restrictions, no TCB :-) */
2416                 return (0);
2417         }
2418         LIST_FOREACH(laddr, &stcb->asoc.sctp_restricted_addrs, sctp_nxt_addr) {
2419                 if (laddr->ifa == NULL) {
2420                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "%s: NULL ifa\n",
2421                             __func__);
2422                         continue;
2423                 }
2424                 if (laddr->ifa == ifa) {
2425                         /* Yes it is on the list */
2426                         return (1);
2427                 }
2428         }
2429         return (0);
2430 }
2431
2432
2433 int
2434 sctp_is_addr_in_ep(struct sctp_inpcb *inp, struct sctp_ifa *ifa)
2435 {
2436         struct sctp_laddr *laddr;
2437
2438         if (ifa == NULL)
2439                 return (0);
2440         LIST_FOREACH(laddr, &inp->sctp_addr_list, sctp_nxt_addr) {
2441                 if (laddr->ifa == NULL) {
2442                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "%s: NULL ifa\n",
2443                             __func__);
2444                         continue;
2445                 }
2446                 if ((laddr->ifa == ifa) && laddr->action == 0)
2447                         /* same pointer */
2448                         return (1);
2449         }
2450         return (0);
2451 }
2452
2453
2454
2455 static struct sctp_ifa *
2456 sctp_choose_boundspecific_inp(struct sctp_inpcb *inp,
2457     sctp_route_t *ro,
2458     uint32_t vrf_id,
2459     int non_asoc_addr_ok,
2460     uint8_t dest_is_priv,
2461     uint8_t dest_is_loop,
2462     sa_family_t fam)
2463 {
2464         struct sctp_laddr *laddr, *starting_point;
2465         void *ifn;
2466         int resettotop = 0;
2467         struct sctp_ifn *sctp_ifn;
2468         struct sctp_ifa *sctp_ifa, *sifa;
2469         struct sctp_vrf *vrf;
2470         uint32_t ifn_index;
2471
2472         vrf = sctp_find_vrf(vrf_id);
2473         if (vrf == NULL)
2474                 return (NULL);
2475
2476         ifn = SCTP_GET_IFN_VOID_FROM_ROUTE(ro);
2477         ifn_index = SCTP_GET_IF_INDEX_FROM_ROUTE(ro);
2478         sctp_ifn = sctp_find_ifn(ifn, ifn_index);
2479         /*
2480          * first question, is the ifn we will emit on in our list, if so, we
2481          * want such an address. Note that we first looked for a preferred
2482          * address.
2483          */
2484         if (sctp_ifn) {
2485                 /* is a preferred one on the interface we route out? */
2486                 LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
2487 #ifdef INET
2488                         if ((sctp_ifa->address.sa.sa_family == AF_INET) &&
2489                             (prison_check_ip4(inp->ip_inp.inp.inp_cred,
2490                             &sctp_ifa->address.sin.sin_addr) != 0)) {
2491                                 continue;
2492                         }
2493 #endif
2494 #ifdef INET6
2495                         if ((sctp_ifa->address.sa.sa_family == AF_INET6) &&
2496                             (prison_check_ip6(inp->ip_inp.inp.inp_cred,
2497                             &sctp_ifa->address.sin6.sin6_addr) != 0)) {
2498                                 continue;
2499                         }
2500 #endif
2501                         if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
2502                             (non_asoc_addr_ok == 0))
2503                                 continue;
2504                         sifa = sctp_is_ifa_addr_preferred(sctp_ifa,
2505                             dest_is_loop,
2506                             dest_is_priv, fam);
2507                         if (sifa == NULL)
2508                                 continue;
2509                         if (sctp_is_addr_in_ep(inp, sifa)) {
2510                                 atomic_add_int(&sifa->refcount, 1);
2511                                 return (sifa);
2512                         }
2513                 }
2514         }
2515         /*
2516          * ok, now we now need to find one on the list of the addresses. We
2517          * can't get one on the emitting interface so let's find first a
2518          * preferred one. If not that an acceptable one otherwise... we
2519          * return NULL.
2520          */
2521         starting_point = inp->next_addr_touse;
2522 once_again:
2523         if (inp->next_addr_touse == NULL) {
2524                 inp->next_addr_touse = LIST_FIRST(&inp->sctp_addr_list);
2525                 resettotop = 1;
2526         }
2527         for (laddr = inp->next_addr_touse; laddr;
2528             laddr = LIST_NEXT(laddr, sctp_nxt_addr)) {
2529                 if (laddr->ifa == NULL) {
2530                         /* address has been removed */
2531                         continue;
2532                 }
2533                 if (laddr->action == SCTP_DEL_IP_ADDRESS) {
2534                         /* address is being deleted */
2535                         continue;
2536                 }
2537                 sifa = sctp_is_ifa_addr_preferred(laddr->ifa, dest_is_loop,
2538                     dest_is_priv, fam);
2539                 if (sifa == NULL)
2540                         continue;
2541                 atomic_add_int(&sifa->refcount, 1);
2542                 return (sifa);
2543         }
2544         if (resettotop == 0) {
2545                 inp->next_addr_touse = NULL;
2546                 goto once_again;
2547         }
2548
2549         inp->next_addr_touse = starting_point;
2550         resettotop = 0;
2551 once_again_too:
2552         if (inp->next_addr_touse == NULL) {
2553                 inp->next_addr_touse = LIST_FIRST(&inp->sctp_addr_list);
2554                 resettotop = 1;
2555         }
2556
2557         /* ok, what about an acceptable address in the inp */
2558         for (laddr = inp->next_addr_touse; laddr;
2559             laddr = LIST_NEXT(laddr, sctp_nxt_addr)) {
2560                 if (laddr->ifa == NULL) {
2561                         /* address has been removed */
2562                         continue;
2563                 }
2564                 if (laddr->action == SCTP_DEL_IP_ADDRESS) {
2565                         /* address is being deleted */
2566                         continue;
2567                 }
2568                 sifa = sctp_is_ifa_addr_acceptable(laddr->ifa, dest_is_loop,
2569                     dest_is_priv, fam);
2570                 if (sifa == NULL)
2571                         continue;
2572                 atomic_add_int(&sifa->refcount, 1);
2573                 return (sifa);
2574         }
2575         if (resettotop == 0) {
2576                 inp->next_addr_touse = NULL;
2577                 goto once_again_too;
2578         }
2579
2580         /*
2581          * no address bound can be a source for the destination we are in
2582          * trouble
2583          */
2584         return (NULL);
2585 }
2586
2587
2588
2589 static struct sctp_ifa *
2590 sctp_choose_boundspecific_stcb(struct sctp_inpcb *inp,
2591     struct sctp_tcb *stcb,
2592     sctp_route_t *ro,
2593     uint32_t vrf_id,
2594     uint8_t dest_is_priv,
2595     uint8_t dest_is_loop,
2596     int non_asoc_addr_ok,
2597     sa_family_t fam)
2598 {
2599         struct sctp_laddr *laddr, *starting_point;
2600         void *ifn;
2601         struct sctp_ifn *sctp_ifn;
2602         struct sctp_ifa *sctp_ifa, *sifa;
2603         uint8_t start_at_beginning = 0;
2604         struct sctp_vrf *vrf;
2605         uint32_t ifn_index;
2606
2607         /*
2608          * first question, is the ifn we will emit on in our list, if so, we
2609          * want that one.
2610          */
2611         vrf = sctp_find_vrf(vrf_id);
2612         if (vrf == NULL)
2613                 return (NULL);
2614
2615         ifn = SCTP_GET_IFN_VOID_FROM_ROUTE(ro);
2616         ifn_index = SCTP_GET_IF_INDEX_FROM_ROUTE(ro);
2617         sctp_ifn = sctp_find_ifn(ifn, ifn_index);
2618
2619         /*
2620          * first question, is the ifn we will emit on in our list?  If so,
2621          * we want that one. First we look for a preferred. Second, we go
2622          * for an acceptable.
2623          */
2624         if (sctp_ifn) {
2625                 /* first try for a preferred address on the ep */
2626                 LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
2627 #ifdef INET
2628                         if ((sctp_ifa->address.sa.sa_family == AF_INET) &&
2629                             (prison_check_ip4(inp->ip_inp.inp.inp_cred,
2630                             &sctp_ifa->address.sin.sin_addr) != 0)) {
2631                                 continue;
2632                         }
2633 #endif
2634 #ifdef INET6
2635                         if ((sctp_ifa->address.sa.sa_family == AF_INET6) &&
2636                             (prison_check_ip6(inp->ip_inp.inp.inp_cred,
2637                             &sctp_ifa->address.sin6.sin6_addr) != 0)) {
2638                                 continue;
2639                         }
2640 #endif
2641                         if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) && (non_asoc_addr_ok == 0))
2642                                 continue;
2643                         if (sctp_is_addr_in_ep(inp, sctp_ifa)) {
2644                                 sifa = sctp_is_ifa_addr_preferred(sctp_ifa, dest_is_loop, dest_is_priv, fam);
2645                                 if (sifa == NULL)
2646                                         continue;
2647                                 if (((non_asoc_addr_ok == 0) &&
2648                                     (sctp_is_addr_restricted(stcb, sifa))) ||
2649                                     (non_asoc_addr_ok &&
2650                                     (sctp_is_addr_restricted(stcb, sifa)) &&
2651                                     (!sctp_is_addr_pending(stcb, sifa)))) {
2652                                         /* on the no-no list */
2653                                         continue;
2654                                 }
2655                                 atomic_add_int(&sifa->refcount, 1);
2656                                 return (sifa);
2657                         }
2658                 }
2659                 /* next try for an acceptable address on the ep */
2660                 LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
2661 #ifdef INET
2662                         if ((sctp_ifa->address.sa.sa_family == AF_INET) &&
2663                             (prison_check_ip4(inp->ip_inp.inp.inp_cred,
2664                             &sctp_ifa->address.sin.sin_addr) != 0)) {
2665                                 continue;
2666                         }
2667 #endif
2668 #ifdef INET6
2669                         if ((sctp_ifa->address.sa.sa_family == AF_INET6) &&
2670                             (prison_check_ip6(inp->ip_inp.inp.inp_cred,
2671                             &sctp_ifa->address.sin6.sin6_addr) != 0)) {
2672                                 continue;
2673                         }
2674 #endif
2675                         if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) && (non_asoc_addr_ok == 0))
2676                                 continue;
2677                         if (sctp_is_addr_in_ep(inp, sctp_ifa)) {
2678                                 sifa = sctp_is_ifa_addr_acceptable(sctp_ifa, dest_is_loop, dest_is_priv, fam);
2679                                 if (sifa == NULL)
2680                                         continue;
2681                                 if (((non_asoc_addr_ok == 0) &&
2682                                     (sctp_is_addr_restricted(stcb, sifa))) ||
2683                                     (non_asoc_addr_ok &&
2684                                     (sctp_is_addr_restricted(stcb, sifa)) &&
2685                                     (!sctp_is_addr_pending(stcb, sifa)))) {
2686                                         /* on the no-no list */
2687                                         continue;
2688                                 }
2689                                 atomic_add_int(&sifa->refcount, 1);
2690                                 return (sifa);
2691                         }
2692                 }
2693
2694         }
2695         /*
2696          * if we can't find one like that then we must look at all addresses
2697          * bound to pick one at first preferable then secondly acceptable.
2698          */
2699         starting_point = stcb->asoc.last_used_address;
2700 sctp_from_the_top:
2701         if (stcb->asoc.last_used_address == NULL) {
2702                 start_at_beginning = 1;
2703                 stcb->asoc.last_used_address = LIST_FIRST(&inp->sctp_addr_list);
2704         }
2705         /* search beginning with the last used address */
2706         for (laddr = stcb->asoc.last_used_address; laddr;
2707             laddr = LIST_NEXT(laddr, sctp_nxt_addr)) {
2708                 if (laddr->ifa == NULL) {
2709                         /* address has been removed */
2710                         continue;
2711                 }
2712                 if (laddr->action == SCTP_DEL_IP_ADDRESS) {
2713                         /* address is being deleted */
2714                         continue;
2715                 }
2716                 sifa = sctp_is_ifa_addr_preferred(laddr->ifa, dest_is_loop, dest_is_priv, fam);
2717                 if (sifa == NULL)
2718                         continue;
2719                 if (((non_asoc_addr_ok == 0) &&
2720                     (sctp_is_addr_restricted(stcb, sifa))) ||
2721                     (non_asoc_addr_ok &&
2722                     (sctp_is_addr_restricted(stcb, sifa)) &&
2723                     (!sctp_is_addr_pending(stcb, sifa)))) {
2724                         /* on the no-no list */
2725                         continue;
2726                 }
2727                 stcb->asoc.last_used_address = laddr;
2728                 atomic_add_int(&sifa->refcount, 1);
2729                 return (sifa);
2730         }
2731         if (start_at_beginning == 0) {
2732                 stcb->asoc.last_used_address = NULL;
2733                 goto sctp_from_the_top;
2734         }
2735         /* now try for any higher scope than the destination */
2736         stcb->asoc.last_used_address = starting_point;
2737         start_at_beginning = 0;
2738 sctp_from_the_top2:
2739         if (stcb->asoc.last_used_address == NULL) {
2740                 start_at_beginning = 1;
2741                 stcb->asoc.last_used_address = LIST_FIRST(&inp->sctp_addr_list);
2742         }
2743         /* search beginning with the last used address */
2744         for (laddr = stcb->asoc.last_used_address; laddr;
2745             laddr = LIST_NEXT(laddr, sctp_nxt_addr)) {
2746                 if (laddr->ifa == NULL) {
2747                         /* address has been removed */
2748                         continue;
2749                 }
2750                 if (laddr->action == SCTP_DEL_IP_ADDRESS) {
2751                         /* address is being deleted */
2752                         continue;
2753                 }
2754                 sifa = sctp_is_ifa_addr_acceptable(laddr->ifa, dest_is_loop,
2755                     dest_is_priv, fam);
2756                 if (sifa == NULL)
2757                         continue;
2758                 if (((non_asoc_addr_ok == 0) &&
2759                     (sctp_is_addr_restricted(stcb, sifa))) ||
2760                     (non_asoc_addr_ok &&
2761                     (sctp_is_addr_restricted(stcb, sifa)) &&
2762                     (!sctp_is_addr_pending(stcb, sifa)))) {
2763                         /* on the no-no list */
2764                         continue;
2765                 }
2766                 stcb->asoc.last_used_address = laddr;
2767                 atomic_add_int(&sifa->refcount, 1);
2768                 return (sifa);
2769         }
2770         if (start_at_beginning == 0) {
2771                 stcb->asoc.last_used_address = NULL;
2772                 goto sctp_from_the_top2;
2773         }
2774         return (NULL);
2775 }
2776
2777 static struct sctp_ifa *
2778 sctp_select_nth_preferred_addr_from_ifn_boundall(struct sctp_ifn *ifn,
2779     struct sctp_inpcb *inp,
2780     struct sctp_tcb *stcb,
2781     int non_asoc_addr_ok,
2782     uint8_t dest_is_loop,
2783     uint8_t dest_is_priv,
2784     int addr_wanted,
2785     sa_family_t fam,
2786     sctp_route_t *ro
2787 )
2788 {
2789         struct sctp_ifa *ifa, *sifa;
2790         int num_eligible_addr = 0;
2791 #ifdef INET6
2792         struct sockaddr_in6 sin6, lsa6;
2793
2794         if (fam == AF_INET6) {
2795                 memcpy(&sin6, &ro->ro_dst, sizeof(struct sockaddr_in6));
2796                 (void)sa6_recoverscope(&sin6);
2797         }
2798 #endif                          /* INET6 */
2799         LIST_FOREACH(ifa, &ifn->ifalist, next_ifa) {
2800 #ifdef INET
2801                 if ((ifa->address.sa.sa_family == AF_INET) &&
2802                     (prison_check_ip4(inp->ip_inp.inp.inp_cred,
2803                     &ifa->address.sin.sin_addr) != 0)) {
2804                         continue;
2805                 }
2806 #endif
2807 #ifdef INET6
2808                 if ((ifa->address.sa.sa_family == AF_INET6) &&
2809                     (prison_check_ip6(inp->ip_inp.inp.inp_cred,
2810                     &ifa->address.sin6.sin6_addr) != 0)) {
2811                         continue;
2812                 }
2813 #endif
2814                 if ((ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
2815                     (non_asoc_addr_ok == 0))
2816                         continue;
2817                 sifa = sctp_is_ifa_addr_preferred(ifa, dest_is_loop,
2818                     dest_is_priv, fam);
2819                 if (sifa == NULL)
2820                         continue;
2821 #ifdef INET6
2822                 if (fam == AF_INET6 &&
2823                     dest_is_loop &&
2824                     sifa->src_is_loop && sifa->src_is_priv) {
2825                         /*
2826                          * don't allow fe80::1 to be a src on loop ::1, we
2827                          * don't list it to the peer so we will get an
2828                          * abort.
2829                          */
2830                         continue;
2831                 }
2832                 if (fam == AF_INET6 &&
2833                     IN6_IS_ADDR_LINKLOCAL(&sifa->address.sin6.sin6_addr) &&
2834                     IN6_IS_ADDR_LINKLOCAL(&sin6.sin6_addr)) {
2835                         /*
2836                          * link-local <-> link-local must belong to the same
2837                          * scope.
2838                          */
2839                         memcpy(&lsa6, &sifa->address.sin6, sizeof(struct sockaddr_in6));
2840                         (void)sa6_recoverscope(&lsa6);
2841                         if (sin6.sin6_scope_id != lsa6.sin6_scope_id) {
2842                                 continue;
2843                         }
2844                 }
2845 #endif                          /* INET6 */
2846
2847                 /*
2848                  * Check if the IPv6 address matches to next-hop. In the
2849                  * mobile case, old IPv6 address may be not deleted from the
2850                  * interface. Then, the interface has previous and new
2851                  * addresses.  We should use one corresponding to the
2852                  * next-hop.  (by micchie)
2853                  */
2854 #ifdef INET6
2855                 if (stcb && fam == AF_INET6 &&
2856                     sctp_is_mobility_feature_on(stcb->sctp_ep, SCTP_MOBILITY_BASE)) {
2857                         if (sctp_v6src_match_nexthop(&sifa->address.sin6, ro)
2858                             == 0) {
2859                                 continue;
2860                         }
2861                 }
2862 #endif
2863 #ifdef INET
2864                 /* Avoid topologically incorrect IPv4 address */
2865                 if (stcb && fam == AF_INET &&
2866                     sctp_is_mobility_feature_on(stcb->sctp_ep, SCTP_MOBILITY_BASE)) {
2867                         if (sctp_v4src_match_nexthop(sifa, ro) == 0) {
2868                                 continue;
2869                         }
2870                 }
2871 #endif
2872                 if (stcb) {
2873                         if (sctp_is_address_in_scope(ifa, &stcb->asoc.scope, 0) == 0) {
2874                                 continue;
2875                         }
2876                         if (((non_asoc_addr_ok == 0) &&
2877                             (sctp_is_addr_restricted(stcb, sifa))) ||
2878                             (non_asoc_addr_ok &&
2879                             (sctp_is_addr_restricted(stcb, sifa)) &&
2880                             (!sctp_is_addr_pending(stcb, sifa)))) {
2881                                 /*
2882                                  * It is restricted for some reason..
2883                                  * probably not yet added.
2884                                  */
2885                                 continue;
2886                         }
2887                 }
2888                 if (num_eligible_addr >= addr_wanted) {
2889                         return (sifa);
2890                 }
2891                 num_eligible_addr++;
2892         }
2893         return (NULL);
2894 }
2895
2896
2897 static int
2898 sctp_count_num_preferred_boundall(struct sctp_ifn *ifn,
2899     struct sctp_inpcb *inp,
2900     struct sctp_tcb *stcb,
2901     int non_asoc_addr_ok,
2902     uint8_t dest_is_loop,
2903     uint8_t dest_is_priv,
2904     sa_family_t fam)
2905 {
2906         struct sctp_ifa *ifa, *sifa;
2907         int num_eligible_addr = 0;
2908
2909         LIST_FOREACH(ifa, &ifn->ifalist, next_ifa) {
2910 #ifdef INET
2911                 if ((ifa->address.sa.sa_family == AF_INET) &&
2912                     (prison_check_ip4(inp->ip_inp.inp.inp_cred,
2913                     &ifa->address.sin.sin_addr) != 0)) {
2914                         continue;
2915                 }
2916 #endif
2917 #ifdef INET6
2918                 if ((ifa->address.sa.sa_family == AF_INET6) &&
2919                     (stcb != NULL) &&
2920                     (prison_check_ip6(inp->ip_inp.inp.inp_cred,
2921                     &ifa->address.sin6.sin6_addr) != 0)) {
2922                         continue;
2923                 }
2924 #endif
2925                 if ((ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
2926                     (non_asoc_addr_ok == 0)) {
2927                         continue;
2928                 }
2929                 sifa = sctp_is_ifa_addr_preferred(ifa, dest_is_loop,
2930                     dest_is_priv, fam);
2931                 if (sifa == NULL) {
2932                         continue;
2933                 }
2934                 if (stcb) {
2935                         if (sctp_is_address_in_scope(ifa, &stcb->asoc.scope, 0) == 0) {
2936                                 continue;
2937                         }
2938                         if (((non_asoc_addr_ok == 0) &&
2939                             (sctp_is_addr_restricted(stcb, sifa))) ||
2940                             (non_asoc_addr_ok &&
2941                             (sctp_is_addr_restricted(stcb, sifa)) &&
2942                             (!sctp_is_addr_pending(stcb, sifa)))) {
2943                                 /*
2944                                  * It is restricted for some reason..
2945                                  * probably not yet added.
2946                                  */
2947                                 continue;
2948                         }
2949                 }
2950                 num_eligible_addr++;
2951         }
2952         return (num_eligible_addr);
2953 }
2954
2955 static struct sctp_ifa *
2956 sctp_choose_boundall(struct sctp_inpcb *inp,
2957     struct sctp_tcb *stcb,
2958     struct sctp_nets *net,
2959     sctp_route_t *ro,
2960     uint32_t vrf_id,
2961     uint8_t dest_is_priv,
2962     uint8_t dest_is_loop,
2963     int non_asoc_addr_ok,
2964     sa_family_t fam)
2965 {
2966         int cur_addr_num = 0, num_preferred = 0;
2967         void *ifn;
2968         struct sctp_ifn *sctp_ifn, *looked_at = NULL, *emit_ifn;
2969         struct sctp_ifa *sctp_ifa, *sifa;
2970         uint32_t ifn_index;
2971         struct sctp_vrf *vrf;
2972 #ifdef INET
2973         int retried = 0;
2974 #endif
2975
2976         /*-
2977          * For boundall we can use any address in the association.
2978          * If non_asoc_addr_ok is set we can use any address (at least in
2979          * theory). So we look for preferred addresses first. If we find one,
2980          * we use it. Otherwise we next try to get an address on the
2981          * interface, which we should be able to do (unless non_asoc_addr_ok
2982          * is false and we are routed out that way). In these cases where we
2983          * can't use the address of the interface we go through all the
2984          * ifn's looking for an address we can use and fill that in. Punting
2985          * means we send back address 0, which will probably cause problems
2986          * actually since then IP will fill in the address of the route ifn,
2987          * which means we probably already rejected it.. i.e. here comes an
2988          * abort :-<.
2989          */
2990         vrf = sctp_find_vrf(vrf_id);
2991         if (vrf == NULL)
2992                 return (NULL);
2993
2994         ifn = SCTP_GET_IFN_VOID_FROM_ROUTE(ro);
2995         ifn_index = SCTP_GET_IF_INDEX_FROM_ROUTE(ro);
2996         SCTPDBG(SCTP_DEBUG_OUTPUT2, "ifn from route:%p ifn_index:%d\n", ifn, ifn_index);
2997         emit_ifn = looked_at = sctp_ifn = sctp_find_ifn(ifn, ifn_index);
2998         if (sctp_ifn == NULL) {
2999                 /* ?? We don't have this guy ?? */
3000                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "No ifn emit interface?\n");
3001                 goto bound_all_plan_b;
3002         }
3003         SCTPDBG(SCTP_DEBUG_OUTPUT2, "ifn_index:%d name:%s is emit interface\n",
3004             ifn_index, sctp_ifn->ifn_name);
3005
3006         if (net) {
3007                 cur_addr_num = net->indx_of_eligible_next_to_use;
3008         }
3009         num_preferred = sctp_count_num_preferred_boundall(sctp_ifn,
3010             inp, stcb,
3011             non_asoc_addr_ok,
3012             dest_is_loop,
3013             dest_is_priv, fam);
3014         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Found %d preferred source addresses for intf:%s\n",
3015             num_preferred, sctp_ifn->ifn_name);
3016         if (num_preferred == 0) {
3017                 /*
3018                  * no eligible addresses, we must use some other interface
3019                  * address if we can find one.
3020                  */
3021                 goto bound_all_plan_b;
3022         }
3023         /*
3024          * Ok we have num_eligible_addr set with how many we can use, this
3025          * may vary from call to call due to addresses being deprecated
3026          * etc..
3027          */
3028         if (cur_addr_num >= num_preferred) {
3029                 cur_addr_num = 0;
3030         }
3031         /*
3032          * select the nth address from the list (where cur_addr_num is the
3033          * nth) and 0 is the first one, 1 is the second one etc...
3034          */
3035         SCTPDBG(SCTP_DEBUG_OUTPUT2, "cur_addr_num:%d\n", cur_addr_num);
3036
3037         sctp_ifa = sctp_select_nth_preferred_addr_from_ifn_boundall(sctp_ifn, inp, stcb, non_asoc_addr_ok, dest_is_loop,
3038             dest_is_priv, cur_addr_num, fam, ro);
3039
3040         /* if sctp_ifa is NULL something changed??, fall to plan b. */
3041         if (sctp_ifa) {
3042                 atomic_add_int(&sctp_ifa->refcount, 1);
3043                 if (net) {
3044                         /* save off where the next one we will want */
3045                         net->indx_of_eligible_next_to_use = cur_addr_num + 1;
3046                 }
3047                 return (sctp_ifa);
3048         }
3049         /*
3050          * plan_b: Look at all interfaces and find a preferred address. If
3051          * no preferred fall through to plan_c.
3052          */
3053 bound_all_plan_b:
3054         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Trying Plan B\n");
3055         LIST_FOREACH(sctp_ifn, &vrf->ifnlist, next_ifn) {
3056                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "Examine interface %s\n",
3057                     sctp_ifn->ifn_name);
3058                 if (dest_is_loop == 0 && SCTP_IFN_IS_IFT_LOOP(sctp_ifn)) {
3059                         /* wrong base scope */
3060                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "skip\n");
3061                         continue;
3062                 }
3063                 if ((sctp_ifn == looked_at) && looked_at) {
3064                         /* already looked at this guy */
3065                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "already seen\n");
3066                         continue;
3067                 }
3068                 num_preferred = sctp_count_num_preferred_boundall(sctp_ifn, inp, stcb, non_asoc_addr_ok,
3069                     dest_is_loop, dest_is_priv, fam);
3070                 SCTPDBG(SCTP_DEBUG_OUTPUT2,
3071                     "Found ifn:%p %d preferred source addresses\n",
3072                     ifn, num_preferred);
3073                 if (num_preferred == 0) {
3074                         /* None on this interface. */
3075                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "No preferred -- skipping to next\n");
3076                         continue;
3077                 }
3078                 SCTPDBG(SCTP_DEBUG_OUTPUT2,
3079                     "num preferred:%d on interface:%p cur_addr_num:%d\n",
3080                     num_preferred, (void *)sctp_ifn, cur_addr_num);
3081
3082                 /*
3083                  * Ok we have num_eligible_addr set with how many we can
3084                  * use, this may vary from call to call due to addresses
3085                  * being deprecated etc..
3086                  */
3087                 if (cur_addr_num >= num_preferred) {
3088                         cur_addr_num = 0;
3089                 }
3090                 sifa = sctp_select_nth_preferred_addr_from_ifn_boundall(sctp_ifn, inp, stcb, non_asoc_addr_ok, dest_is_loop,
3091                     dest_is_priv, cur_addr_num, fam, ro);
3092                 if (sifa == NULL)
3093                         continue;
3094                 if (net) {
3095                         net->indx_of_eligible_next_to_use = cur_addr_num + 1;
3096                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "we selected %d\n",
3097                             cur_addr_num);
3098                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Source:");
3099                         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, &sifa->address.sa);
3100                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Dest:");
3101                         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, &net->ro._l_addr.sa);
3102                 }
3103                 atomic_add_int(&sifa->refcount, 1);
3104                 return (sifa);
3105         }
3106 #ifdef INET
3107 again_with_private_addresses_allowed:
3108 #endif
3109         /* plan_c: do we have an acceptable address on the emit interface */
3110         sifa = NULL;
3111         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Trying Plan C: find acceptable on interface\n");
3112         if (emit_ifn == NULL) {
3113                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "Jump to Plan D - no emit_ifn\n");
3114                 goto plan_d;
3115         }
3116         LIST_FOREACH(sctp_ifa, &emit_ifn->ifalist, next_ifa) {
3117                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "ifa:%p\n", (void *)sctp_ifa);
3118 #ifdef INET
3119                 if ((sctp_ifa->address.sa.sa_family == AF_INET) &&
3120                     (prison_check_ip4(inp->ip_inp.inp.inp_cred,
3121                     &sctp_ifa->address.sin.sin_addr) != 0)) {
3122                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Jailed\n");
3123                         continue;
3124                 }
3125 #endif
3126 #ifdef INET6
3127                 if ((sctp_ifa->address.sa.sa_family == AF_INET6) &&
3128                     (prison_check_ip6(inp->ip_inp.inp.inp_cred,
3129                     &sctp_ifa->address.sin6.sin6_addr) != 0)) {
3130                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Jailed\n");
3131                         continue;
3132                 }
3133 #endif
3134                 if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
3135                     (non_asoc_addr_ok == 0)) {
3136                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Defer\n");
3137                         continue;
3138                 }
3139                 sifa = sctp_is_ifa_addr_acceptable(sctp_ifa, dest_is_loop,
3140                     dest_is_priv, fam);
3141                 if (sifa == NULL) {
3142                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "IFA not acceptable\n");
3143                         continue;
3144                 }
3145                 if (stcb) {
3146                         if (sctp_is_address_in_scope(sifa, &stcb->asoc.scope, 0) == 0) {
3147                                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "NOT in scope\n");
3148                                 sifa = NULL;
3149                                 continue;
3150                         }
3151                         if (((non_asoc_addr_ok == 0) &&
3152                             (sctp_is_addr_restricted(stcb, sifa))) ||
3153                             (non_asoc_addr_ok &&
3154                             (sctp_is_addr_restricted(stcb, sifa)) &&
3155                             (!sctp_is_addr_pending(stcb, sifa)))) {
3156                                 /*
3157                                  * It is restricted for some reason..
3158                                  * probably not yet added.
3159                                  */
3160                                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "Its restricted\n");
3161                                 sifa = NULL;
3162                                 continue;
3163                         }
3164                 }
3165                 atomic_add_int(&sifa->refcount, 1);
3166                 goto out;
3167         }
3168 plan_d:
3169         /*
3170          * plan_d: We are in trouble. No preferred address on the emit
3171          * interface. And not even a preferred address on all interfaces. Go
3172          * out and see if we can find an acceptable address somewhere
3173          * amongst all interfaces.
3174          */
3175         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Trying Plan D looked_at is %p\n", (void *)looked_at);
3176         LIST_FOREACH(sctp_ifn, &vrf->ifnlist, next_ifn) {
3177                 if (dest_is_loop == 0 && SCTP_IFN_IS_IFT_LOOP(sctp_ifn)) {
3178                         /* wrong base scope */
3179                         continue;
3180                 }
3181                 LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
3182 #ifdef INET
3183                         if ((sctp_ifa->address.sa.sa_family == AF_INET) &&
3184                             (prison_check_ip4(inp->ip_inp.inp.inp_cred,
3185                             &sctp_ifa->address.sin.sin_addr) != 0)) {
3186                                 continue;
3187                         }
3188 #endif
3189 #ifdef INET6
3190                         if ((sctp_ifa->address.sa.sa_family == AF_INET6) &&
3191                             (prison_check_ip6(inp->ip_inp.inp.inp_cred,
3192                             &sctp_ifa->address.sin6.sin6_addr) != 0)) {
3193                                 continue;
3194                         }
3195 #endif
3196                         if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
3197                             (non_asoc_addr_ok == 0))
3198                                 continue;
3199                         sifa = sctp_is_ifa_addr_acceptable(sctp_ifa,
3200                             dest_is_loop,
3201                             dest_is_priv, fam);
3202                         if (sifa == NULL)
3203                                 continue;
3204                         if (stcb) {
3205                                 if (sctp_is_address_in_scope(sifa, &stcb->asoc.scope, 0) == 0) {
3206                                         sifa = NULL;
3207                                         continue;
3208                                 }
3209                                 if (((non_asoc_addr_ok == 0) &&
3210                                     (sctp_is_addr_restricted(stcb, sifa))) ||
3211                                     (non_asoc_addr_ok &&
3212                                     (sctp_is_addr_restricted(stcb, sifa)) &&
3213                                     (!sctp_is_addr_pending(stcb, sifa)))) {
3214                                         /*
3215                                          * It is restricted for some
3216                                          * reason.. probably not yet added.
3217                                          */
3218                                         sifa = NULL;
3219                                         continue;
3220                                 }
3221                         }
3222                         goto out;
3223                 }
3224         }
3225 #ifdef INET
3226         if (stcb) {
3227                 if ((retried == 0) && (stcb->asoc.scope.ipv4_local_scope == 0)) {
3228                         stcb->asoc.scope.ipv4_local_scope = 1;
3229                         retried = 1;
3230                         goto again_with_private_addresses_allowed;
3231                 } else if (retried == 1) {
3232                         stcb->asoc.scope.ipv4_local_scope = 0;
3233                 }
3234         }
3235 #endif
3236 out:
3237 #ifdef INET
3238         if (sifa) {
3239                 if (retried == 1) {
3240                         LIST_FOREACH(sctp_ifn, &vrf->ifnlist, next_ifn) {
3241                                 if (dest_is_loop == 0 && SCTP_IFN_IS_IFT_LOOP(sctp_ifn)) {
3242                                         /* wrong base scope */
3243                                         continue;
3244                                 }
3245                                 LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
3246                                         struct sctp_ifa *tmp_sifa;
3247
3248 #ifdef INET
3249                                         if ((sctp_ifa->address.sa.sa_family == AF_INET) &&
3250                                             (prison_check_ip4(inp->ip_inp.inp.inp_cred,
3251                                             &sctp_ifa->address.sin.sin_addr) != 0)) {
3252                                                 continue;
3253                                         }
3254 #endif
3255 #ifdef INET6
3256                                         if ((sctp_ifa->address.sa.sa_family == AF_INET6) &&
3257                                             (prison_check_ip6(inp->ip_inp.inp.inp_cred,
3258                                             &sctp_ifa->address.sin6.sin6_addr) != 0)) {
3259                                                 continue;
3260                                         }
3261 #endif
3262                                         if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
3263                                             (non_asoc_addr_ok == 0))
3264                                                 continue;
3265                                         tmp_sifa = sctp_is_ifa_addr_acceptable(sctp_ifa,
3266                                             dest_is_loop,
3267                                             dest_is_priv, fam);
3268                                         if (tmp_sifa == NULL) {
3269                                                 continue;
3270                                         }
3271                                         if (tmp_sifa == sifa) {
3272                                                 continue;
3273                                         }
3274                                         if (stcb) {
3275                                                 if (sctp_is_address_in_scope(tmp_sifa,
3276                                                     &stcb->asoc.scope, 0) == 0) {
3277                                                         continue;
3278                                                 }
3279                                                 if (((non_asoc_addr_ok == 0) &&
3280                                                     (sctp_is_addr_restricted(stcb, tmp_sifa))) ||
3281                                                     (non_asoc_addr_ok &&
3282                                                     (sctp_is_addr_restricted(stcb, tmp_sifa)) &&
3283                                                     (!sctp_is_addr_pending(stcb, tmp_sifa)))) {
3284                                                         /*
3285                                                          * It is restricted
3286                                                          * for some reason..
3287                                                          * probably not yet
3288                                                          * added.
3289                                                          */
3290                                                         continue;
3291                                                 }
3292                                         }
3293                                         if ((tmp_sifa->address.sin.sin_family == AF_INET) &&
3294                                             (IN4_ISPRIVATE_ADDRESS(&(tmp_sifa->address.sin.sin_addr)))) {
3295                                                 sctp_add_local_addr_restricted(stcb, tmp_sifa);
3296                                         }
3297                                 }
3298                         }
3299                 }
3300                 atomic_add_int(&sifa->refcount, 1);
3301         }
3302 #endif
3303         return (sifa);
3304 }
3305
3306
3307
3308 /* tcb may be NULL */
3309 struct sctp_ifa *
3310 sctp_source_address_selection(struct sctp_inpcb *inp,
3311     struct sctp_tcb *stcb,
3312     sctp_route_t *ro,
3313     struct sctp_nets *net,
3314     int non_asoc_addr_ok, uint32_t vrf_id)
3315 {
3316         struct sctp_ifa *answer;
3317         uint8_t dest_is_priv, dest_is_loop;
3318         sa_family_t fam;
3319 #ifdef INET
3320         struct sockaddr_in *to = (struct sockaddr_in *)&ro->ro_dst;
3321 #endif
3322 #ifdef INET6
3323         struct sockaddr_in6 *to6 = (struct sockaddr_in6 *)&ro->ro_dst;
3324 #endif
3325
3326         /**
3327          * Rules:
3328          * - Find the route if needed, cache if I can.
3329          * - Look at interface address in route, Is it in the bound list. If so we
3330          *   have the best source.
3331          * - If not we must rotate amongst the addresses.
3332          *
3333          * Cavets and issues
3334          *
3335          * Do we need to pay attention to scope. We can have a private address
3336          * or a global address we are sourcing or sending to. So if we draw
3337          * it out
3338          * zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz
3339          * For V4
3340          * ------------------------------------------
3341          *      source     *      dest  *  result
3342          * -----------------------------------------
3343          * <a>  Private    *    Global  *  NAT
3344          * -----------------------------------------
3345          * <b>  Private    *    Private *  No problem
3346          * -----------------------------------------
3347          * <c>  Global     *    Private *  Huh, How will this work?
3348          * -----------------------------------------
3349          * <d>  Global     *    Global  *  No Problem
3350          *------------------------------------------
3351          * zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz
3352          * For V6
3353          *------------------------------------------
3354          *      source     *      dest  *  result
3355          * -----------------------------------------
3356          * <a>  Linklocal  *    Global  *
3357          * -----------------------------------------
3358          * <b>  Linklocal  * Linklocal  *  No problem
3359          * -----------------------------------------
3360          * <c>  Global     * Linklocal  *  Huh, How will this work?
3361          * -----------------------------------------
3362          * <d>  Global     *    Global  *  No Problem
3363          *------------------------------------------
3364          * zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz
3365          *
3366          * And then we add to that what happens if there are multiple addresses
3367          * assigned to an interface. Remember the ifa on a ifn is a linked
3368          * list of addresses. So one interface can have more than one IP
3369          * address. What happens if we have both a private and a global
3370          * address? Do we then use context of destination to sort out which
3371          * one is best? And what about NAT's sending P->G may get you a NAT
3372          * translation, or should you select the G thats on the interface in
3373          * preference.
3374          *
3375          * Decisions:
3376          *
3377          * - count the number of addresses on the interface.
3378          * - if it is one, no problem except case <c>.
3379          *   For <a> we will assume a NAT out there.
3380          * - if there are more than one, then we need to worry about scope P
3381          *   or G. We should prefer G -> G and P -> P if possible.
3382          *   Then as a secondary fall back to mixed types G->P being a last
3383          *   ditch one.
3384          * - The above all works for bound all, but bound specific we need to
3385          *   use the same concept but instead only consider the bound
3386          *   addresses. If the bound set is NOT assigned to the interface then
3387          *   we must use rotation amongst the bound addresses..
3388          */
3389         if (ro->ro_nh == NULL) {
3390                 /*
3391                  * Need a route to cache.
3392                  */
3393                 SCTP_RTALLOC(ro, vrf_id, inp->fibnum);
3394         }
3395         if (ro->ro_nh == NULL) {
3396                 return (NULL);
3397         }
3398         fam = ro->ro_dst.sa_family;
3399         dest_is_priv = dest_is_loop = 0;
3400         /* Setup our scopes for the destination */
3401         switch (fam) {
3402 #ifdef INET
3403         case AF_INET:
3404                 /* Scope based on outbound address */
3405                 if (IN4_ISLOOPBACK_ADDRESS(&to->sin_addr)) {
3406                         dest_is_loop = 1;
3407                         if (net != NULL) {
3408                                 /* mark it as local */
3409                                 net->addr_is_local = 1;
3410                         }
3411                 } else if ((IN4_ISPRIVATE_ADDRESS(&to->sin_addr))) {
3412                         dest_is_priv = 1;
3413                 }
3414                 break;
3415 #endif
3416 #ifdef INET6
3417         case AF_INET6:
3418                 /* Scope based on outbound address */
3419                 if (IN6_IS_ADDR_LOOPBACK(&to6->sin6_addr) ||
3420                     SCTP_ROUTE_IS_REAL_LOOP(ro)) {
3421                         /*
3422                          * If the address is a loopback address, which
3423                          * consists of "::1" OR "fe80::1%lo0", we are
3424                          * loopback scope. But we don't use dest_is_priv
3425                          * (link local addresses).
3426                          */
3427                         dest_is_loop = 1;
3428                         if (net != NULL) {
3429                                 /* mark it as local */
3430                                 net->addr_is_local = 1;
3431                         }
3432                 } else if (IN6_IS_ADDR_LINKLOCAL(&to6->sin6_addr)) {
3433                         dest_is_priv = 1;
3434                 }
3435                 break;
3436 #endif
3437         }
3438         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Select source addr for:");
3439         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)&ro->ro_dst);
3440         SCTP_IPI_ADDR_RLOCK();
3441         if (inp->sctp_flags & SCTP_PCB_FLAGS_BOUNDALL) {
3442                 /*
3443                  * Bound all case
3444                  */
3445                 answer = sctp_choose_boundall(inp, stcb, net, ro, vrf_id,
3446                     dest_is_priv, dest_is_loop,
3447                     non_asoc_addr_ok, fam);
3448                 SCTP_IPI_ADDR_RUNLOCK();
3449                 return (answer);
3450         }
3451         /*
3452          * Subset bound case
3453          */
3454         if (stcb) {
3455                 answer = sctp_choose_boundspecific_stcb(inp, stcb, ro,
3456                     vrf_id, dest_is_priv,
3457                     dest_is_loop,
3458                     non_asoc_addr_ok, fam);
3459         } else {
3460                 answer = sctp_choose_boundspecific_inp(inp, ro, vrf_id,
3461                     non_asoc_addr_ok,
3462                     dest_is_priv,
3463                     dest_is_loop, fam);
3464         }
3465         SCTP_IPI_ADDR_RUNLOCK();
3466         return (answer);
3467 }
3468
3469 static int
3470 sctp_find_cmsg(int c_type, void *data, struct mbuf *control, size_t cpsize)
3471 {
3472         struct cmsghdr cmh;
3473         struct sctp_sndinfo sndinfo;
3474         struct sctp_prinfo prinfo;
3475         struct sctp_authinfo authinfo;
3476         int tot_len, rem_len, cmsg_data_len, cmsg_data_off, off;
3477         int found;
3478
3479         /*
3480          * Independent of how many mbufs, find the c_type inside the control
3481          * structure and copy out the data.
3482          */
3483         found = 0;
3484         tot_len = SCTP_BUF_LEN(control);
3485         for (off = 0; off < tot_len; off += CMSG_ALIGN(cmh.cmsg_len)) {
3486                 rem_len = tot_len - off;
3487                 if (rem_len < (int)CMSG_ALIGN(sizeof(cmh))) {
3488                         /* There is not enough room for one more. */
3489                         return (found);
3490                 }
3491                 m_copydata(control, off, sizeof(cmh), (caddr_t)&cmh);
3492                 if (cmh.cmsg_len < CMSG_ALIGN(sizeof(cmh))) {
3493                         /* We dont't have a complete CMSG header. */
3494                         return (found);
3495                 }
3496                 if ((cmh.cmsg_len > INT_MAX) || ((int)cmh.cmsg_len > rem_len)) {
3497                         /* We don't have the complete CMSG. */
3498                         return (found);
3499                 }
3500                 cmsg_data_len = (int)cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh));
3501                 cmsg_data_off = off + CMSG_ALIGN(sizeof(cmh));
3502                 if ((cmh.cmsg_level == IPPROTO_SCTP) &&
3503                     ((c_type == cmh.cmsg_type) ||
3504                     ((c_type == SCTP_SNDRCV) &&
3505                     ((cmh.cmsg_type == SCTP_SNDINFO) ||
3506                     (cmh.cmsg_type == SCTP_PRINFO) ||
3507                     (cmh.cmsg_type == SCTP_AUTHINFO))))) {
3508                         if (c_type == cmh.cmsg_type) {
3509                                 if (cpsize > INT_MAX) {
3510                                         return (found);
3511                                 }
3512                                 if (cmsg_data_len < (int)cpsize) {
3513                                         return (found);
3514                                 }
3515                                 /* It is exactly what we want. Copy it out. */
3516                                 m_copydata(control, cmsg_data_off, (int)cpsize, (caddr_t)data);
3517                                 return (1);
3518                         } else {
3519                                 struct sctp_sndrcvinfo *sndrcvinfo;
3520
3521                                 sndrcvinfo = (struct sctp_sndrcvinfo *)data;
3522                                 if (found == 0) {
3523                                         if (cpsize < sizeof(struct sctp_sndrcvinfo)) {
3524                                                 return (found);
3525                                         }
3526                                         memset(sndrcvinfo, 0, sizeof(struct sctp_sndrcvinfo));
3527                                 }
3528                                 switch (cmh.cmsg_type) {
3529                                 case SCTP_SNDINFO:
3530                                         if (cmsg_data_len < (int)sizeof(struct sctp_sndinfo)) {
3531                                                 return (found);
3532                                         }
3533                                         m_copydata(control, cmsg_data_off, sizeof(struct sctp_sndinfo), (caddr_t)&sndinfo);
3534                                         sndrcvinfo->sinfo_stream = sndinfo.snd_sid;
3535                                         sndrcvinfo->sinfo_flags = sndinfo.snd_flags;
3536                                         sndrcvinfo->sinfo_ppid = sndinfo.snd_ppid;
3537                                         sndrcvinfo->sinfo_context = sndinfo.snd_context;
3538                                         sndrcvinfo->sinfo_assoc_id = sndinfo.snd_assoc_id;
3539                                         break;
3540                                 case SCTP_PRINFO:
3541                                         if (cmsg_data_len < (int)sizeof(struct sctp_prinfo)) {
3542                                                 return (found);
3543                                         }
3544                                         m_copydata(control, cmsg_data_off, sizeof(struct sctp_prinfo), (caddr_t)&prinfo);
3545                                         if (prinfo.pr_policy != SCTP_PR_SCTP_NONE) {
3546                                                 sndrcvinfo->sinfo_timetolive = prinfo.pr_value;
3547                                         } else {
3548                                                 sndrcvinfo->sinfo_timetolive = 0;
3549                                         }
3550                                         sndrcvinfo->sinfo_flags |= prinfo.pr_policy;
3551                                         break;
3552                                 case SCTP_AUTHINFO:
3553                                         if (cmsg_data_len < (int)sizeof(struct sctp_authinfo)) {
3554                                                 return (found);
3555                                         }
3556                                         m_copydata(control, cmsg_data_off, sizeof(struct sctp_authinfo), (caddr_t)&authinfo);
3557                                         sndrcvinfo->sinfo_keynumber_valid = 1;
3558                                         sndrcvinfo->sinfo_keynumber = authinfo.auth_keynumber;
3559                                         break;
3560                                 default:
3561                                         return (found);
3562                                 }
3563                                 found = 1;
3564                         }
3565                 }
3566         }
3567         return (found);
3568 }
3569
3570 static int
3571 sctp_process_cmsgs_for_init(struct sctp_tcb *stcb, struct mbuf *control, int *error)
3572 {
3573         struct cmsghdr cmh;
3574         struct sctp_initmsg initmsg;
3575 #ifdef INET
3576         struct sockaddr_in sin;
3577 #endif
3578 #ifdef INET6
3579         struct sockaddr_in6 sin6;
3580 #endif
3581         int tot_len, rem_len, cmsg_data_len, cmsg_data_off, off;
3582
3583         tot_len = SCTP_BUF_LEN(control);
3584         for (off = 0; off < tot_len; off += CMSG_ALIGN(cmh.cmsg_len)) {
3585                 rem_len = tot_len - off;
3586                 if (rem_len < (int)CMSG_ALIGN(sizeof(cmh))) {
3587                         /* There is not enough room for one more. */
3588                         *error = EINVAL;
3589                         return (1);
3590                 }
3591                 m_copydata(control, off, sizeof(cmh), (caddr_t)&cmh);
3592                 if (cmh.cmsg_len < CMSG_ALIGN(sizeof(cmh))) {
3593                         /* We dont't have a complete CMSG header. */
3594                         *error = EINVAL;
3595                         return (1);
3596                 }
3597                 if ((cmh.cmsg_len > INT_MAX) || ((int)cmh.cmsg_len > rem_len)) {
3598                         /* We don't have the complete CMSG. */
3599                         *error = EINVAL;
3600                         return (1);
3601                 }
3602                 cmsg_data_len = (int)cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh));
3603                 cmsg_data_off = off + CMSG_ALIGN(sizeof(cmh));
3604                 if (cmh.cmsg_level == IPPROTO_SCTP) {
3605                         switch (cmh.cmsg_type) {
3606                         case SCTP_INIT:
3607                                 if (cmsg_data_len < (int)sizeof(struct sctp_initmsg)) {
3608                                         *error = EINVAL;
3609                                         return (1);
3610                                 }
3611                                 m_copydata(control, cmsg_data_off, sizeof(struct sctp_initmsg), (caddr_t)&initmsg);
3612                                 if (initmsg.sinit_max_attempts)
3613                                         stcb->asoc.max_init_times = initmsg.sinit_max_attempts;
3614                                 if (initmsg.sinit_num_ostreams)
3615                                         stcb->asoc.pre_open_streams = initmsg.sinit_num_ostreams;
3616                                 if (initmsg.sinit_max_instreams)
3617                                         stcb->asoc.max_inbound_streams = initmsg.sinit_max_instreams;
3618                                 if (initmsg.sinit_max_init_timeo)
3619                                         stcb->asoc.initial_init_rto_max = initmsg.sinit_max_init_timeo;
3620                                 if (stcb->asoc.streamoutcnt < stcb->asoc.pre_open_streams) {
3621                                         struct sctp_stream_out *tmp_str;
3622                                         unsigned int i;
3623 #if defined(SCTP_DETAILED_STR_STATS)
3624                                         int j;
3625 #endif
3626
3627                                         /* Default is NOT correct */
3628                                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Ok, default:%d pre_open:%d\n",
3629                                             stcb->asoc.streamoutcnt, stcb->asoc.pre_open_streams);
3630                                         SCTP_TCB_UNLOCK(stcb);
3631                                         SCTP_MALLOC(tmp_str,
3632                                             struct sctp_stream_out *,
3633                                             (stcb->asoc.pre_open_streams * sizeof(struct sctp_stream_out)),
3634                                             SCTP_M_STRMO);
3635                                         SCTP_TCB_LOCK(stcb);
3636                                         if (tmp_str != NULL) {
3637                                                 SCTP_FREE(stcb->asoc.strmout, SCTP_M_STRMO);
3638                                                 stcb->asoc.strmout = tmp_str;
3639                                                 stcb->asoc.strm_realoutsize = stcb->asoc.streamoutcnt = stcb->asoc.pre_open_streams;
3640                                         } else {
3641                                                 stcb->asoc.pre_open_streams = stcb->asoc.streamoutcnt;
3642                                         }
3643                                         for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
3644                                                 TAILQ_INIT(&stcb->asoc.strmout[i].outqueue);
3645                                                 stcb->asoc.strmout[i].chunks_on_queues = 0;
3646                                                 stcb->asoc.strmout[i].next_mid_ordered = 0;
3647                                                 stcb->asoc.strmout[i].next_mid_unordered = 0;
3648 #if defined(SCTP_DETAILED_STR_STATS)
3649                                                 for (j = 0; j < SCTP_PR_SCTP_MAX + 1; j++) {
3650                                                         stcb->asoc.strmout[i].abandoned_sent[j] = 0;
3651                                                         stcb->asoc.strmout[i].abandoned_unsent[j] = 0;
3652                                                 }
3653 #else
3654                                                 stcb->asoc.strmout[i].abandoned_sent[0] = 0;
3655                                                 stcb->asoc.strmout[i].abandoned_unsent[0] = 0;
3656 #endif
3657                                                 stcb->asoc.strmout[i].sid = i;
3658                                                 stcb->asoc.strmout[i].last_msg_incomplete = 0;
3659                                                 stcb->asoc.strmout[i].state = SCTP_STREAM_OPENING;
3660                                                 stcb->asoc.ss_functions.sctp_ss_init_stream(stcb, &stcb->asoc.strmout[i], NULL);
3661                                         }
3662                                 }
3663                                 break;
3664 #ifdef INET
3665                         case SCTP_DSTADDRV4:
3666                                 if (cmsg_data_len < (int)sizeof(struct in_addr)) {
3667                                         *error = EINVAL;
3668                                         return (1);
3669                                 }
3670                                 memset(&sin, 0, sizeof(struct sockaddr_in));
3671                                 sin.sin_family = AF_INET;
3672                                 sin.sin_len = sizeof(struct sockaddr_in);
3673                                 sin.sin_port = stcb->rport;
3674                                 m_copydata(control, cmsg_data_off, sizeof(struct in_addr), (caddr_t)&sin.sin_addr);
3675                                 if ((sin.sin_addr.s_addr == INADDR_ANY) ||
3676                                     (sin.sin_addr.s_addr == INADDR_BROADCAST) ||
3677                                     IN_MULTICAST(ntohl(sin.sin_addr.s_addr))) {
3678                                         *error = EINVAL;
3679                                         return (1);
3680                                 }
3681                                 if (sctp_add_remote_addr(stcb, (struct sockaddr *)&sin, NULL, stcb->asoc.port,
3682                                     SCTP_DONOT_SETSCOPE, SCTP_ADDR_IS_CONFIRMED)) {
3683                                         *error = ENOBUFS;
3684                                         return (1);
3685                                 }
3686                                 break;
3687 #endif
3688 #ifdef INET6
3689                         case SCTP_DSTADDRV6:
3690                                 if (cmsg_data_len < (int)sizeof(struct in6_addr)) {
3691                                         *error = EINVAL;
3692                                         return (1);
3693                                 }
3694                                 memset(&sin6, 0, sizeof(struct sockaddr_in6));
3695                                 sin6.sin6_family = AF_INET6;
3696                                 sin6.sin6_len = sizeof(struct sockaddr_in6);
3697                                 sin6.sin6_port = stcb->rport;
3698                                 m_copydata(control, cmsg_data_off, sizeof(struct in6_addr), (caddr_t)&sin6.sin6_addr);
3699                                 if (IN6_IS_ADDR_UNSPECIFIED(&sin6.sin6_addr) ||
3700                                     IN6_IS_ADDR_MULTICAST(&sin6.sin6_addr)) {
3701                                         *error = EINVAL;
3702                                         return (1);
3703                                 }
3704 #ifdef INET
3705                                 if (IN6_IS_ADDR_V4MAPPED(&sin6.sin6_addr)) {
3706                                         in6_sin6_2_sin(&sin, &sin6);
3707                                         if ((sin.sin_addr.s_addr == INADDR_ANY) ||
3708                                             (sin.sin_addr.s_addr == INADDR_BROADCAST) ||
3709                                             IN_MULTICAST(ntohl(sin.sin_addr.s_addr))) {
3710                                                 *error = EINVAL;
3711                                                 return (1);
3712                                         }
3713                                         if (sctp_add_remote_addr(stcb, (struct sockaddr *)&sin, NULL, stcb->asoc.port,
3714                                             SCTP_DONOT_SETSCOPE, SCTP_ADDR_IS_CONFIRMED)) {
3715                                                 *error = ENOBUFS;
3716                                                 return (1);
3717                                         }
3718                                 } else
3719 #endif
3720                                         if (sctp_add_remote_addr(stcb, (struct sockaddr *)&sin6, NULL, stcb->asoc.port,
3721                                     SCTP_DONOT_SETSCOPE, SCTP_ADDR_IS_CONFIRMED)) {
3722                                         *error = ENOBUFS;
3723                                         return (1);
3724                                 }
3725                                 break;
3726 #endif
3727                         default:
3728                                 break;
3729                         }
3730                 }
3731         }
3732         return (0);
3733 }
3734
3735 #if defined(INET) || defined(INET6)
3736 static struct sctp_tcb *
3737 sctp_findassociation_cmsgs(struct sctp_inpcb **inp_p,
3738     uint16_t port,
3739     struct mbuf *control,
3740     struct sctp_nets **net_p,
3741     int *error)
3742 {
3743         struct cmsghdr cmh;
3744         struct sctp_tcb *stcb;
3745         struct sockaddr *addr;
3746 #ifdef INET
3747         struct sockaddr_in sin;
3748 #endif
3749 #ifdef INET6
3750         struct sockaddr_in6 sin6;
3751 #endif
3752         int tot_len, rem_len, cmsg_data_len, cmsg_data_off, off;
3753
3754         tot_len = SCTP_BUF_LEN(control);
3755         for (off = 0; off < tot_len; off += CMSG_ALIGN(cmh.cmsg_len)) {
3756                 rem_len = tot_len - off;
3757                 if (rem_len < (int)CMSG_ALIGN(sizeof(cmh))) {
3758                         /* There is not enough room for one more. */
3759                         *error = EINVAL;
3760                         return (NULL);
3761                 }
3762                 m_copydata(control, off, sizeof(cmh), (caddr_t)&cmh);
3763                 if (cmh.cmsg_len < CMSG_ALIGN(sizeof(cmh))) {
3764                         /* We dont't have a complete CMSG header. */
3765                         *error = EINVAL;
3766                         return (NULL);
3767                 }
3768                 if ((cmh.cmsg_len > INT_MAX) || ((int)cmh.cmsg_len > rem_len)) {
3769                         /* We don't have the complete CMSG. */
3770                         *error = EINVAL;
3771                         return (NULL);
3772                 }
3773                 cmsg_data_len = (int)cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh));
3774                 cmsg_data_off = off + CMSG_ALIGN(sizeof(cmh));
3775                 if (cmh.cmsg_level == IPPROTO_SCTP) {
3776                         switch (cmh.cmsg_type) {
3777 #ifdef INET
3778                         case SCTP_DSTADDRV4:
3779                                 if (cmsg_data_len < (int)sizeof(struct in_addr)) {
3780                                         *error = EINVAL;
3781                                         return (NULL);
3782                                 }
3783                                 memset(&sin, 0, sizeof(struct sockaddr_in));
3784                                 sin.sin_family = AF_INET;
3785                                 sin.sin_len = sizeof(struct sockaddr_in);
3786                                 sin.sin_port = port;
3787                                 m_copydata(control, cmsg_data_off, sizeof(struct in_addr), (caddr_t)&sin.sin_addr);
3788                                 addr = (struct sockaddr *)&sin;
3789                                 break;
3790 #endif
3791 #ifdef INET6
3792                         case SCTP_DSTADDRV6:
3793                                 if (cmsg_data_len < (int)sizeof(struct in6_addr)) {
3794                                         *error = EINVAL;
3795                                         return (NULL);
3796                                 }
3797                                 memset(&sin6, 0, sizeof(struct sockaddr_in6));
3798                                 sin6.sin6_family = AF_INET6;
3799                                 sin6.sin6_len = sizeof(struct sockaddr_in6);
3800                                 sin6.sin6_port = port;
3801                                 m_copydata(control, cmsg_data_off, sizeof(struct in6_addr), (caddr_t)&sin6.sin6_addr);
3802 #ifdef INET
3803                                 if (IN6_IS_ADDR_V4MAPPED(&sin6.sin6_addr)) {
3804                                         in6_sin6_2_sin(&sin, &sin6);
3805                                         addr = (struct sockaddr *)&sin;
3806                                 } else
3807 #endif
3808                                         addr = (struct sockaddr *)&sin6;
3809                                 break;
3810 #endif
3811                         default:
3812                                 addr = NULL;
3813                                 break;
3814                         }
3815                         if (addr) {
3816                                 stcb = sctp_findassociation_ep_addr(inp_p, addr, net_p, NULL, NULL);
3817                                 if (stcb != NULL) {
3818                                         return (stcb);
3819                                 }
3820                         }
3821                 }
3822         }
3823         return (NULL);
3824 }
3825 #endif
3826
3827 static struct mbuf *
3828 sctp_add_cookie(struct mbuf *init, int init_offset,
3829     struct mbuf *initack, int initack_offset, struct sctp_state_cookie *stc_in, uint8_t **signature)
3830 {
3831         struct mbuf *copy_init, *copy_initack, *m_at, *sig, *mret;
3832         struct sctp_state_cookie *stc;
3833         struct sctp_paramhdr *ph;
3834         uint16_t cookie_sz;
3835
3836         mret = sctp_get_mbuf_for_msg((sizeof(struct sctp_state_cookie) +
3837             sizeof(struct sctp_paramhdr)), 0,
3838             M_NOWAIT, 1, MT_DATA);
3839         if (mret == NULL) {
3840                 return (NULL);
3841         }
3842         copy_init = SCTP_M_COPYM(init, init_offset, M_COPYALL, M_NOWAIT);
3843         if (copy_init == NULL) {
3844                 sctp_m_freem(mret);
3845                 return (NULL);
3846         }
3847 #ifdef SCTP_MBUF_LOGGING
3848         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
3849                 sctp_log_mbc(copy_init, SCTP_MBUF_ICOPY);
3850         }
3851 #endif
3852         copy_initack = SCTP_M_COPYM(initack, initack_offset, M_COPYALL,
3853             M_NOWAIT);
3854         if (copy_initack == NULL) {
3855                 sctp_m_freem(mret);
3856                 sctp_m_freem(copy_init);
3857                 return (NULL);
3858         }
3859 #ifdef SCTP_MBUF_LOGGING
3860         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
3861                 sctp_log_mbc(copy_initack, SCTP_MBUF_ICOPY);
3862         }
3863 #endif
3864         /* easy side we just drop it on the end */
3865         ph = mtod(mret, struct sctp_paramhdr *);
3866         SCTP_BUF_LEN(mret) = sizeof(struct sctp_state_cookie) +
3867             sizeof(struct sctp_paramhdr);
3868         stc = (struct sctp_state_cookie *)((caddr_t)ph +
3869             sizeof(struct sctp_paramhdr));
3870         ph->param_type = htons(SCTP_STATE_COOKIE);
3871         ph->param_length = 0;   /* fill in at the end */
3872         /* Fill in the stc cookie data */
3873         memcpy(stc, stc_in, sizeof(struct sctp_state_cookie));
3874
3875         /* tack the INIT and then the INIT-ACK onto the chain */
3876         cookie_sz = 0;
3877         for (m_at = mret; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
3878                 cookie_sz += SCTP_BUF_LEN(m_at);
3879                 if (SCTP_BUF_NEXT(m_at) == NULL) {
3880                         SCTP_BUF_NEXT(m_at) = copy_init;
3881                         break;
3882                 }
3883         }
3884         for (m_at = copy_init; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
3885                 cookie_sz += SCTP_BUF_LEN(m_at);
3886                 if (SCTP_BUF_NEXT(m_at) == NULL) {
3887                         SCTP_BUF_NEXT(m_at) = copy_initack;
3888                         break;
3889                 }
3890         }
3891         for (m_at = copy_initack; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
3892                 cookie_sz += SCTP_BUF_LEN(m_at);
3893                 if (SCTP_BUF_NEXT(m_at) == NULL) {
3894                         break;
3895                 }
3896         }
3897         sig = sctp_get_mbuf_for_msg(SCTP_SIGNATURE_SIZE, 0, M_NOWAIT, 1, MT_DATA);
3898         if (sig == NULL) {
3899                 /* no space, so free the entire chain */
3900                 sctp_m_freem(mret);
3901                 return (NULL);
3902         }
3903         SCTP_BUF_NEXT(m_at) = sig;
3904         SCTP_BUF_LEN(sig) = SCTP_SIGNATURE_SIZE;
3905         cookie_sz += SCTP_SIGNATURE_SIZE;
3906         ph->param_length = htons(cookie_sz);
3907         *signature = (uint8_t *)mtod(sig, caddr_t);
3908         memset(*signature, 0, SCTP_SIGNATURE_SIZE);
3909         return (mret);
3910 }
3911
3912 static uint8_t
3913 sctp_get_ect(struct sctp_tcb *stcb)
3914 {
3915         if ((stcb != NULL) && (stcb->asoc.ecn_supported == 1)) {
3916                 return (SCTP_ECT0_BIT);
3917         } else {
3918                 return (0);
3919         }
3920 }
3921
3922 #if defined(INET) || defined(INET6)
3923 static void
3924 sctp_handle_no_route(struct sctp_tcb *stcb,
3925     struct sctp_nets *net,
3926     int so_locked)
3927 {
3928         SCTPDBG(SCTP_DEBUG_OUTPUT1, "dropped packet - no valid source addr\n");
3929
3930         if (net) {
3931                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Destination was ");
3932                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT1, &net->ro._l_addr.sa);
3933                 if (net->dest_state & SCTP_ADDR_CONFIRMED) {
3934                         if ((net->dest_state & SCTP_ADDR_REACHABLE) && stcb) {
3935                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "no route takes interface %p down\n", (void *)net);
3936                                 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_DOWN,
3937                                     stcb, 0,
3938                                     (void *)net,
3939                                     so_locked);
3940                                 net->dest_state &= ~SCTP_ADDR_REACHABLE;
3941                                 net->dest_state &= ~SCTP_ADDR_PF;
3942                         }
3943                 }
3944                 if (stcb) {
3945                         if (net == stcb->asoc.primary_destination) {
3946                                 /* need a new primary */
3947                                 struct sctp_nets *alt;
3948
3949                                 alt = sctp_find_alternate_net(stcb, net, 0);
3950                                 if (alt != net) {
3951                                         if (stcb->asoc.alternate) {
3952                                                 sctp_free_remote_addr(stcb->asoc.alternate);
3953                                         }
3954                                         stcb->asoc.alternate = alt;
3955                                         atomic_add_int(&stcb->asoc.alternate->ref_count, 1);
3956                                         if (net->ro._s_addr) {
3957                                                 sctp_free_ifa(net->ro._s_addr);
3958                                                 net->ro._s_addr = NULL;
3959                                         }
3960                                         net->src_addr_selected = 0;
3961                                 }
3962                         }
3963                 }
3964         }
3965 }
3966 #endif
3967
3968 static int
3969 sctp_lowlevel_chunk_output(struct sctp_inpcb *inp,
3970     struct sctp_tcb *stcb,      /* may be NULL */
3971     struct sctp_nets *net,
3972     struct sockaddr *to,
3973     struct mbuf *m,
3974     uint32_t auth_offset,
3975     struct sctp_auth_chunk *auth,
3976     uint16_t auth_keyid,
3977     int nofragment_flag,
3978     int ecn_ok,
3979     int out_of_asoc_ok,
3980     uint16_t src_port,
3981     uint16_t dest_port,
3982     uint32_t v_tag,
3983     uint16_t port,
3984     union sctp_sockstore *over_addr,
3985     uint8_t mflowtype, uint32_t mflowid,
3986     int so_locked)
3987 {
3988 /* nofragment_flag to tell if IP_DF should be set (IPv4 only) */
3989         /**
3990          * Given a mbuf chain (via SCTP_BUF_NEXT()) that holds a packet header
3991          * WITH an SCTPHDR but no IP header, endpoint inp and sa structure:
3992          * - fill in the HMAC digest of any AUTH chunk in the packet.
3993          * - calculate and fill in the SCTP checksum.
3994          * - prepend an IP address header.
3995          * - if boundall use INADDR_ANY.
3996          * - if boundspecific do source address selection.
3997          * - set fragmentation option for ipV4.
3998          * - On return from IP output, check/adjust mtu size of output
3999          *   interface and smallest_mtu size as well.
4000          */
4001         /* Will need ifdefs around this */
4002         struct mbuf *newm;
4003         struct sctphdr *sctphdr;
4004         int packet_length;
4005         int ret;
4006 #if defined(INET) || defined(INET6)
4007         uint32_t vrf_id;
4008 #endif
4009 #if defined(INET) || defined(INET6)
4010         struct mbuf *o_pak;
4011         sctp_route_t *ro = NULL;
4012         struct udphdr *udp = NULL;
4013 #endif
4014         uint8_t tos_value;
4015
4016         if ((net) && (net->dest_state & SCTP_ADDR_OUT_OF_SCOPE)) {
4017                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EFAULT);
4018                 sctp_m_freem(m);
4019                 return (EFAULT);
4020         }
4021 #if defined(INET) || defined(INET6)
4022         if (stcb) {
4023                 vrf_id = stcb->asoc.vrf_id;
4024         } else {
4025                 vrf_id = inp->def_vrf_id;
4026         }
4027 #endif
4028         /* fill in the HMAC digest for any AUTH chunk in the packet */
4029         if ((auth != NULL) && (stcb != NULL)) {
4030                 sctp_fill_hmac_digest_m(m, auth_offset, auth, stcb, auth_keyid);
4031         }
4032
4033         if (net) {
4034                 tos_value = net->dscp;
4035         } else if (stcb) {
4036                 tos_value = stcb->asoc.default_dscp;
4037         } else {
4038                 tos_value = inp->sctp_ep.default_dscp;
4039         }
4040
4041         switch (to->sa_family) {
4042 #ifdef INET
4043         case AF_INET:
4044                 {
4045                         struct ip *ip = NULL;
4046                         sctp_route_t iproute;
4047                         int len;
4048
4049                         len = SCTP_MIN_V4_OVERHEAD;
4050                         if (port) {
4051                                 len += sizeof(struct udphdr);
4052                         }
4053                         newm = sctp_get_mbuf_for_msg(len, 1, M_NOWAIT, 1, MT_DATA);
4054                         if (newm == NULL) {
4055                                 sctp_m_freem(m);
4056                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
4057                                 return (ENOMEM);
4058                         }
4059                         SCTP_ALIGN_TO_END(newm, len);
4060                         SCTP_BUF_LEN(newm) = len;
4061                         SCTP_BUF_NEXT(newm) = m;
4062                         m = newm;
4063                         if (net != NULL) {
4064                                 m->m_pkthdr.flowid = net->flowid;
4065                                 M_HASHTYPE_SET(m, net->flowtype);
4066                         } else {
4067                                 m->m_pkthdr.flowid = mflowid;
4068                                 M_HASHTYPE_SET(m, mflowtype);
4069                         }
4070                         packet_length = sctp_calculate_len(m);
4071                         ip = mtod(m, struct ip *);
4072                         ip->ip_v = IPVERSION;
4073                         ip->ip_hl = (sizeof(struct ip) >> 2);
4074                         if (tos_value == 0) {
4075                                 /*
4076                                  * This means especially, that it is not set
4077                                  * at the SCTP layer. So use the value from
4078                                  * the IP layer.
4079                                  */
4080                                 tos_value = inp->ip_inp.inp.inp_ip_tos;
4081                         }
4082                         tos_value &= 0xfc;
4083                         if (ecn_ok) {
4084                                 tos_value |= sctp_get_ect(stcb);
4085                         }
4086                         if ((nofragment_flag) && (port == 0)) {
4087                                 ip->ip_off = htons(IP_DF);
4088                         } else {
4089                                 ip->ip_off = htons(0);
4090                         }
4091                         /* FreeBSD has a function for ip_id's */
4092                         ip_fillid(ip);
4093
4094                         ip->ip_ttl = inp->ip_inp.inp.inp_ip_ttl;
4095                         ip->ip_len = htons(packet_length);
4096                         ip->ip_tos = tos_value;
4097                         if (port) {
4098                                 ip->ip_p = IPPROTO_UDP;
4099                         } else {
4100                                 ip->ip_p = IPPROTO_SCTP;
4101                         }
4102                         ip->ip_sum = 0;
4103                         if (net == NULL) {
4104                                 ro = &iproute;
4105                                 memset(&iproute, 0, sizeof(iproute));
4106                                 memcpy(&ro->ro_dst, to, to->sa_len);
4107                         } else {
4108                                 ro = (sctp_route_t *)&net->ro;
4109                         }
4110                         /* Now the address selection part */
4111                         ip->ip_dst.s_addr = ((struct sockaddr_in *)to)->sin_addr.s_addr;
4112
4113                         /* call the routine to select the src address */
4114                         if (net && out_of_asoc_ok == 0) {
4115                                 if (net->ro._s_addr && (net->ro._s_addr->localifa_flags & (SCTP_BEING_DELETED | SCTP_ADDR_IFA_UNUSEABLE))) {
4116                                         sctp_free_ifa(net->ro._s_addr);
4117                                         net->ro._s_addr = NULL;
4118                                         net->src_addr_selected = 0;
4119                                         RO_NHFREE(ro);
4120                                 }
4121                                 if (net->src_addr_selected == 0) {
4122                                         /* Cache the source address */
4123                                         net->ro._s_addr = sctp_source_address_selection(inp, stcb,
4124                                             ro, net, 0,
4125                                             vrf_id);
4126                                         net->src_addr_selected = 1;
4127                                 }
4128                                 if (net->ro._s_addr == NULL) {
4129                                         /* No route to host */
4130                                         net->src_addr_selected = 0;
4131                                         sctp_handle_no_route(stcb, net, so_locked);
4132                                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4133                                         sctp_m_freem(m);
4134                                         return (EHOSTUNREACH);
4135                                 }
4136                                 ip->ip_src = net->ro._s_addr->address.sin.sin_addr;
4137                         } else {
4138                                 if (over_addr == NULL) {
4139                                         struct sctp_ifa *_lsrc;
4140
4141                                         _lsrc = sctp_source_address_selection(inp, stcb, ro,
4142                                             net,
4143                                             out_of_asoc_ok,
4144                                             vrf_id);
4145                                         if (_lsrc == NULL) {
4146                                                 sctp_handle_no_route(stcb, net, so_locked);
4147                                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4148                                                 sctp_m_freem(m);
4149                                                 return (EHOSTUNREACH);
4150                                         }
4151                                         ip->ip_src = _lsrc->address.sin.sin_addr;
4152                                         sctp_free_ifa(_lsrc);
4153                                 } else {
4154                                         ip->ip_src = over_addr->sin.sin_addr;
4155                                         SCTP_RTALLOC(ro, vrf_id, inp->fibnum);
4156                                 }
4157                         }
4158                         if (port) {
4159                                 if (htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port)) == 0) {
4160                                         sctp_handle_no_route(stcb, net, so_locked);
4161                                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4162                                         sctp_m_freem(m);
4163                                         return (EHOSTUNREACH);
4164                                 }
4165                                 udp = (struct udphdr *)((caddr_t)ip + sizeof(struct ip));
4166                                 udp->uh_sport = htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port));
4167                                 udp->uh_dport = port;
4168                                 udp->uh_ulen = htons((uint16_t)(packet_length - sizeof(struct ip)));
4169                                 if (V_udp_cksum) {
4170                                         udp->uh_sum = in_pseudo(ip->ip_src.s_addr, ip->ip_dst.s_addr, udp->uh_ulen + htons(IPPROTO_UDP));
4171                                 } else {
4172                                         udp->uh_sum = 0;
4173                                 }
4174                                 sctphdr = (struct sctphdr *)((caddr_t)udp + sizeof(struct udphdr));
4175                         } else {
4176                                 sctphdr = (struct sctphdr *)((caddr_t)ip + sizeof(struct ip));
4177                         }
4178
4179                         sctphdr->src_port = src_port;
4180                         sctphdr->dest_port = dest_port;
4181                         sctphdr->v_tag = v_tag;
4182                         sctphdr->checksum = 0;
4183
4184                         /*
4185                          * If source address selection fails and we find no
4186                          * route then the ip_output should fail as well with
4187                          * a NO_ROUTE_TO_HOST type error. We probably should
4188                          * catch that somewhere and abort the association
4189                          * right away (assuming this is an INIT being sent).
4190                          */
4191                         if (ro->ro_nh == NULL) {
4192                                 /*
4193                                  * src addr selection failed to find a route
4194                                  * (or valid source addr), so we can't get
4195                                  * there from here (yet)!
4196                                  */
4197                                 sctp_handle_no_route(stcb, net, so_locked);
4198                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4199                                 sctp_m_freem(m);
4200                                 return (EHOSTUNREACH);
4201                         }
4202                         if (ro != &iproute) {
4203                                 memcpy(&iproute, ro, sizeof(*ro));
4204                         }
4205                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "Calling ipv4 output routine from low level src addr:%x\n",
4206                             (uint32_t)(ntohl(ip->ip_src.s_addr)));
4207                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "Destination is %x\n",
4208                             (uint32_t)(ntohl(ip->ip_dst.s_addr)));
4209                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "RTP route is %p through\n",
4210                             (void *)ro->ro_nh);
4211
4212                         if (SCTP_GET_HEADER_FOR_OUTPUT(o_pak)) {
4213                                 /* failed to prepend data, give up */
4214                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
4215                                 sctp_m_freem(m);
4216                                 return (ENOMEM);
4217                         }
4218                         SCTP_ATTACH_CHAIN(o_pak, m, packet_length);
4219                         if (port) {
4220                                 sctphdr->checksum = sctp_calculate_cksum(m, sizeof(struct ip) + sizeof(struct udphdr));
4221                                 SCTP_STAT_INCR(sctps_sendswcrc);
4222                                 if (V_udp_cksum) {
4223                                         SCTP_ENABLE_UDP_CSUM(o_pak);
4224                                 }
4225                         } else {
4226                                 m->m_pkthdr.csum_flags = CSUM_SCTP;
4227                                 m->m_pkthdr.csum_data = offsetof(struct sctphdr, checksum);
4228                                 SCTP_STAT_INCR(sctps_sendhwcrc);
4229                         }
4230 #ifdef SCTP_PACKET_LOGGING
4231                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING)
4232                                 sctp_packet_log(o_pak);
4233 #endif
4234                         /* send it out.  table id is taken from stcb */
4235                         SCTP_PROBE5(send, NULL, stcb, ip, stcb, sctphdr);
4236                         SCTP_IP_OUTPUT(ret, o_pak, ro, stcb, vrf_id);
4237                         if (port) {
4238                                 UDPSTAT_INC(udps_opackets);
4239                         }
4240                         SCTP_STAT_INCR(sctps_sendpackets);
4241                         SCTP_STAT_INCR_COUNTER64(sctps_outpackets);
4242                         if (ret)
4243                                 SCTP_STAT_INCR(sctps_senderrors);
4244
4245                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "IP output returns %d\n", ret);
4246                         if (net == NULL) {
4247                                 /* free tempy routes */
4248                                 RO_NHFREE(ro);
4249                         } else {
4250                                 if ((ro->ro_nh != NULL) && (net->ro._s_addr) &&
4251                                     ((net->dest_state & SCTP_ADDR_NO_PMTUD) == 0)) {
4252                                         uint32_t mtu;
4253
4254                                         mtu = SCTP_GATHER_MTU_FROM_ROUTE(net->ro._s_addr, &net->ro._l_addr.sa, ro->ro_nh);
4255                                         if (mtu > 0) {
4256                                                 if (net->port) {
4257                                                         mtu -= sizeof(struct udphdr);
4258                                                 }
4259                                                 if (mtu < net->mtu) {
4260                                                         if ((stcb != NULL) && (stcb->asoc.smallest_mtu > mtu)) {
4261                                                                 sctp_mtu_size_reset(inp, &stcb->asoc, mtu);
4262                                                         }
4263                                                         net->mtu = mtu;
4264                                                 }
4265                                         }
4266                                 } else if (ro->ro_nh == NULL) {
4267                                         /* route was freed */
4268                                         if (net->ro._s_addr &&
4269                                             net->src_addr_selected) {
4270                                                 sctp_free_ifa(net->ro._s_addr);
4271                                                 net->ro._s_addr = NULL;
4272                                         }
4273                                         net->src_addr_selected = 0;
4274                                 }
4275                         }
4276                         return (ret);
4277                 }
4278 #endif
4279 #ifdef INET6
4280         case AF_INET6:
4281                 {
4282                         uint32_t flowlabel, flowinfo;
4283                         struct ip6_hdr *ip6h;
4284                         struct route_in6 ip6route;
4285                         struct ifnet *ifp;
4286                         struct sockaddr_in6 *sin6, tmp, *lsa6, lsa6_tmp;
4287                         int prev_scope = 0;
4288                         struct sockaddr_in6 lsa6_storage;
4289                         int error;
4290                         u_short prev_port = 0;
4291                         int len;
4292
4293                         if (net) {
4294                                 flowlabel = net->flowlabel;
4295                         } else if (stcb) {
4296                                 flowlabel = stcb->asoc.default_flowlabel;
4297                         } else {
4298                                 flowlabel = inp->sctp_ep.default_flowlabel;
4299                         }
4300                         if (flowlabel == 0) {
4301                                 /*
4302                                  * This means especially, that it is not set
4303                                  * at the SCTP layer. So use the value from
4304                                  * the IP layer.
4305                                  */
4306                                 flowlabel = ntohl(((struct inpcb *)inp)->inp_flow);
4307                         }
4308                         flowlabel &= 0x000fffff;
4309                         len = SCTP_MIN_OVERHEAD;
4310                         if (port) {
4311                                 len += sizeof(struct udphdr);
4312                         }
4313                         newm = sctp_get_mbuf_for_msg(len, 1, M_NOWAIT, 1, MT_DATA);
4314                         if (newm == NULL) {
4315                                 sctp_m_freem(m);
4316                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
4317                                 return (ENOMEM);
4318                         }
4319                         SCTP_ALIGN_TO_END(newm, len);
4320                         SCTP_BUF_LEN(newm) = len;
4321                         SCTP_BUF_NEXT(newm) = m;
4322                         m = newm;
4323                         if (net != NULL) {
4324                                 m->m_pkthdr.flowid = net->flowid;
4325                                 M_HASHTYPE_SET(m, net->flowtype);
4326                         } else {
4327                                 m->m_pkthdr.flowid = mflowid;
4328                                 M_HASHTYPE_SET(m, mflowtype);
4329                         }
4330                         packet_length = sctp_calculate_len(m);
4331
4332                         ip6h = mtod(m, struct ip6_hdr *);
4333                         /* protect *sin6 from overwrite */
4334                         sin6 = (struct sockaddr_in6 *)to;
4335                         tmp = *sin6;
4336                         sin6 = &tmp;
4337
4338                         /* KAME hack: embed scopeid */
4339                         if (sa6_embedscope(sin6, MODULE_GLOBAL(ip6_use_defzone)) != 0) {
4340                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
4341                                 sctp_m_freem(m);
4342                                 return (EINVAL);
4343                         }
4344                         if (net == NULL) {
4345                                 memset(&ip6route, 0, sizeof(ip6route));
4346                                 ro = (sctp_route_t *)&ip6route;
4347                                 memcpy(&ro->ro_dst, sin6, sin6->sin6_len);
4348                         } else {
4349                                 ro = (sctp_route_t *)&net->ro;
4350                         }
4351                         /*
4352                          * We assume here that inp_flow is in host byte
4353                          * order within the TCB!
4354                          */
4355                         if (tos_value == 0) {
4356                                 /*
4357                                  * This means especially, that it is not set
4358                                  * at the SCTP layer. So use the value from
4359                                  * the IP layer.
4360                                  */
4361                                 tos_value = (ntohl(((struct inpcb *)inp)->inp_flow) >> 20) & 0xff;
4362                         }
4363                         tos_value &= 0xfc;
4364                         if (ecn_ok) {
4365                                 tos_value |= sctp_get_ect(stcb);
4366                         }
4367                         flowinfo = 0x06;
4368                         flowinfo <<= 8;
4369                         flowinfo |= tos_value;
4370                         flowinfo <<= 20;
4371                         flowinfo |= flowlabel;
4372                         ip6h->ip6_flow = htonl(flowinfo);
4373                         if (port) {
4374                                 ip6h->ip6_nxt = IPPROTO_UDP;
4375                         } else {
4376                                 ip6h->ip6_nxt = IPPROTO_SCTP;
4377                         }
4378                         ip6h->ip6_plen = htons((uint16_t)(packet_length - sizeof(struct ip6_hdr)));
4379                         ip6h->ip6_dst = sin6->sin6_addr;
4380
4381                         /*
4382                          * Add SRC address selection here: we can only reuse
4383                          * to a limited degree the kame src-addr-sel, since
4384                          * we can try their selection but it may not be
4385                          * bound.
4386                          */
4387                         memset(&lsa6_tmp, 0, sizeof(lsa6_tmp));
4388                         lsa6_tmp.sin6_family = AF_INET6;
4389                         lsa6_tmp.sin6_len = sizeof(lsa6_tmp);
4390                         lsa6 = &lsa6_tmp;
4391                         if (net && out_of_asoc_ok == 0) {
4392                                 if (net->ro._s_addr && (net->ro._s_addr->localifa_flags & (SCTP_BEING_DELETED | SCTP_ADDR_IFA_UNUSEABLE))) {
4393                                         sctp_free_ifa(net->ro._s_addr);
4394                                         net->ro._s_addr = NULL;
4395                                         net->src_addr_selected = 0;
4396                                         RO_NHFREE(ro);
4397                                 }
4398                                 if (net->src_addr_selected == 0) {
4399                                         sin6 = (struct sockaddr_in6 *)&net->ro._l_addr;
4400                                         /* KAME hack: embed scopeid */
4401                                         if (sa6_embedscope(sin6, MODULE_GLOBAL(ip6_use_defzone)) != 0) {
4402                                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
4403                                                 sctp_m_freem(m);
4404                                                 return (EINVAL);
4405                                         }
4406                                         /* Cache the source address */
4407                                         net->ro._s_addr = sctp_source_address_selection(inp,
4408                                             stcb,
4409                                             ro,
4410                                             net,
4411                                             0,
4412                                             vrf_id);
4413                                         (void)sa6_recoverscope(sin6);
4414                                         net->src_addr_selected = 1;
4415                                 }
4416                                 if (net->ro._s_addr == NULL) {
4417                                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "V6:No route to host\n");
4418                                         net->src_addr_selected = 0;
4419                                         sctp_handle_no_route(stcb, net, so_locked);
4420                                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4421                                         sctp_m_freem(m);
4422                                         return (EHOSTUNREACH);
4423                                 }
4424                                 lsa6->sin6_addr = net->ro._s_addr->address.sin6.sin6_addr;
4425                         } else {
4426                                 sin6 = (struct sockaddr_in6 *)&ro->ro_dst;
4427                                 /* KAME hack: embed scopeid */
4428                                 if (sa6_embedscope(sin6, MODULE_GLOBAL(ip6_use_defzone)) != 0) {
4429                                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
4430                                         sctp_m_freem(m);
4431                                         return (EINVAL);
4432                                 }
4433                                 if (over_addr == NULL) {
4434                                         struct sctp_ifa *_lsrc;
4435
4436                                         _lsrc = sctp_source_address_selection(inp, stcb, ro,
4437                                             net,
4438                                             out_of_asoc_ok,
4439                                             vrf_id);
4440                                         if (_lsrc == NULL) {
4441                                                 sctp_handle_no_route(stcb, net, so_locked);
4442                                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4443                                                 sctp_m_freem(m);
4444                                                 return (EHOSTUNREACH);
4445                                         }
4446                                         lsa6->sin6_addr = _lsrc->address.sin6.sin6_addr;
4447                                         sctp_free_ifa(_lsrc);
4448                                 } else {
4449                                         lsa6->sin6_addr = over_addr->sin6.sin6_addr;
4450                                         SCTP_RTALLOC(ro, vrf_id, inp->fibnum);
4451                                 }
4452                                 (void)sa6_recoverscope(sin6);
4453                         }
4454                         lsa6->sin6_port = inp->sctp_lport;
4455
4456                         if (ro->ro_nh == NULL) {
4457                                 /*
4458                                  * src addr selection failed to find a route
4459                                  * (or valid source addr), so we can't get
4460                                  * there from here!
4461                                  */
4462                                 sctp_handle_no_route(stcb, net, so_locked);
4463                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4464                                 sctp_m_freem(m);
4465                                 return (EHOSTUNREACH);
4466                         }
4467                         /*
4468                          * XXX: sa6 may not have a valid sin6_scope_id in
4469                          * the non-SCOPEDROUTING case.
4470                          */
4471                         memset(&lsa6_storage, 0, sizeof(lsa6_storage));
4472                         lsa6_storage.sin6_family = AF_INET6;
4473                         lsa6_storage.sin6_len = sizeof(lsa6_storage);
4474                         lsa6_storage.sin6_addr = lsa6->sin6_addr;
4475                         if ((error = sa6_recoverscope(&lsa6_storage)) != 0) {
4476                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "recover scope fails error %d\n", error);
4477                                 sctp_m_freem(m);
4478                                 return (error);
4479                         }
4480                         /* XXX */
4481                         lsa6_storage.sin6_addr = lsa6->sin6_addr;
4482                         lsa6_storage.sin6_port = inp->sctp_lport;
4483                         lsa6 = &lsa6_storage;
4484                         ip6h->ip6_src = lsa6->sin6_addr;
4485
4486                         if (port) {
4487                                 if (htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port)) == 0) {
4488                                         sctp_handle_no_route(stcb, net, so_locked);
4489                                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4490                                         sctp_m_freem(m);
4491                                         return (EHOSTUNREACH);
4492                                 }
4493                                 udp = (struct udphdr *)((caddr_t)ip6h + sizeof(struct ip6_hdr));
4494                                 udp->uh_sport = htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port));
4495                                 udp->uh_dport = port;
4496                                 udp->uh_ulen = htons((uint16_t)(packet_length - sizeof(struct ip6_hdr)));
4497                                 udp->uh_sum = 0;
4498                                 sctphdr = (struct sctphdr *)((caddr_t)udp + sizeof(struct udphdr));
4499                         } else {
4500                                 sctphdr = (struct sctphdr *)((caddr_t)ip6h + sizeof(struct ip6_hdr));
4501                         }
4502
4503                         sctphdr->src_port = src_port;
4504                         sctphdr->dest_port = dest_port;
4505                         sctphdr->v_tag = v_tag;
4506                         sctphdr->checksum = 0;
4507
4508                         /*
4509                          * We set the hop limit now since there is a good
4510                          * chance that our ro pointer is now filled
4511                          */
4512                         ip6h->ip6_hlim = SCTP_GET_HLIM(inp, ro);
4513                         ifp = SCTP_GET_IFN_VOID_FROM_ROUTE(ro);
4514
4515 #ifdef SCTP_DEBUG
4516                         /* Copy to be sure something bad is not happening */
4517                         sin6->sin6_addr = ip6h->ip6_dst;
4518                         lsa6->sin6_addr = ip6h->ip6_src;
4519 #endif
4520
4521                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "Calling ipv6 output routine from low level\n");
4522                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "src: ");
4523                         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT3, (struct sockaddr *)lsa6);
4524                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "dst: ");
4525                         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT3, (struct sockaddr *)sin6);
4526                         if (net) {
4527                                 sin6 = (struct sockaddr_in6 *)&net->ro._l_addr;
4528                                 /*
4529                                  * preserve the port and scope for link
4530                                  * local send
4531                                  */
4532                                 prev_scope = sin6->sin6_scope_id;
4533                                 prev_port = sin6->sin6_port;
4534                         }
4535
4536                         if (SCTP_GET_HEADER_FOR_OUTPUT(o_pak)) {
4537                                 /* failed to prepend data, give up */
4538                                 sctp_m_freem(m);
4539                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
4540                                 return (ENOMEM);
4541                         }
4542                         SCTP_ATTACH_CHAIN(o_pak, m, packet_length);
4543                         if (port) {
4544                                 sctphdr->checksum = sctp_calculate_cksum(m, sizeof(struct ip6_hdr) + sizeof(struct udphdr));
4545                                 SCTP_STAT_INCR(sctps_sendswcrc);
4546                                 if ((udp->uh_sum = in6_cksum(o_pak, IPPROTO_UDP, sizeof(struct ip6_hdr), packet_length - sizeof(struct ip6_hdr))) == 0) {
4547                                         udp->uh_sum = 0xffff;
4548                                 }
4549                         } else {
4550                                 m->m_pkthdr.csum_flags = CSUM_SCTP_IPV6;
4551                                 m->m_pkthdr.csum_data = offsetof(struct sctphdr, checksum);
4552                                 SCTP_STAT_INCR(sctps_sendhwcrc);
4553                         }
4554                         /* send it out. table id is taken from stcb */
4555 #ifdef SCTP_PACKET_LOGGING
4556                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING)
4557                                 sctp_packet_log(o_pak);
4558 #endif
4559                         SCTP_PROBE5(send, NULL, stcb, ip6h, stcb, sctphdr);
4560                         SCTP_IP6_OUTPUT(ret, o_pak, (struct route_in6 *)ro, &ifp, stcb, vrf_id);
4561                         if (net) {
4562                                 /* for link local this must be done */
4563                                 sin6->sin6_scope_id = prev_scope;
4564                                 sin6->sin6_port = prev_port;
4565                         }
4566                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "return from send is %d\n", ret);
4567                         if (port) {
4568                                 UDPSTAT_INC(udps_opackets);
4569                         }
4570                         SCTP_STAT_INCR(sctps_sendpackets);
4571                         SCTP_STAT_INCR_COUNTER64(sctps_outpackets);
4572                         if (ret) {
4573                                 SCTP_STAT_INCR(sctps_senderrors);
4574                         }
4575                         if (net == NULL) {
4576                                 /* Now if we had a temp route free it */
4577                                 RO_NHFREE(ro);
4578                         } else {
4579                                 /*
4580                                  * PMTU check versus smallest asoc MTU goes
4581                                  * here
4582                                  */
4583                                 if (ro->ro_nh == NULL) {
4584                                         /* Route was freed */
4585                                         if (net->ro._s_addr &&
4586                                             net->src_addr_selected) {
4587                                                 sctp_free_ifa(net->ro._s_addr);
4588                                                 net->ro._s_addr = NULL;
4589                                         }
4590                                         net->src_addr_selected = 0;
4591                                 }
4592                                 if ((ro->ro_nh != NULL) && (net->ro._s_addr) &&
4593                                     ((net->dest_state & SCTP_ADDR_NO_PMTUD) == 0)) {
4594                                         uint32_t mtu;
4595
4596                                         mtu = SCTP_GATHER_MTU_FROM_ROUTE(net->ro._s_addr, &net->ro._l_addr.sa, ro->ro_nh);
4597                                         if (mtu > 0) {
4598                                                 if (net->port) {
4599                                                         mtu -= sizeof(struct udphdr);
4600                                                 }
4601                                                 if (mtu < net->mtu) {
4602                                                         if ((stcb != NULL) && (stcb->asoc.smallest_mtu > mtu)) {
4603                                                                 sctp_mtu_size_reset(inp, &stcb->asoc, mtu);
4604                                                         }
4605                                                         net->mtu = mtu;
4606                                                 }
4607                                         }
4608                                 } else if (ifp) {
4609                                         if (ND_IFINFO(ifp)->linkmtu &&
4610                                             (stcb->asoc.smallest_mtu > ND_IFINFO(ifp)->linkmtu)) {
4611                                                 sctp_mtu_size_reset(inp,
4612                                                     &stcb->asoc,
4613                                                     ND_IFINFO(ifp)->linkmtu);
4614                                         }
4615                                 }
4616                         }
4617                         return (ret);
4618                 }
4619 #endif
4620         default:
4621                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Unknown protocol (TSNH) type %d\n",
4622                     ((struct sockaddr *)to)->sa_family);
4623                 sctp_m_freem(m);
4624                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EFAULT);
4625                 return (EFAULT);
4626         }
4627 }
4628
4629
4630 void
4631 sctp_send_initiate(struct sctp_inpcb *inp, struct sctp_tcb *stcb, int so_locked)
4632 {
4633         struct mbuf *m, *m_last;
4634         struct sctp_nets *net;
4635         struct sctp_init_chunk *init;
4636         struct sctp_supported_addr_param *sup_addr;
4637         struct sctp_adaptation_layer_indication *ali;
4638         struct sctp_supported_chunk_types_param *pr_supported;
4639         struct sctp_paramhdr *ph;
4640         int cnt_inits_to = 0;
4641         int error;
4642         uint16_t num_ext, chunk_len, padding_len, parameter_len;
4643
4644         /* INIT's always go to the primary (and usually ONLY address) */
4645         net = stcb->asoc.primary_destination;
4646         if (net == NULL) {
4647                 net = TAILQ_FIRST(&stcb->asoc.nets);
4648                 if (net == NULL) {
4649                         /* TSNH */
4650                         return;
4651                 }
4652                 /* we confirm any address we send an INIT to */
4653                 net->dest_state &= ~SCTP_ADDR_UNCONFIRMED;
4654                 (void)sctp_set_primary_addr(stcb, NULL, net);
4655         } else {
4656                 /* we confirm any address we send an INIT to */
4657                 net->dest_state &= ~SCTP_ADDR_UNCONFIRMED;
4658         }
4659         SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT\n");
4660 #ifdef INET6
4661         if (net->ro._l_addr.sa.sa_family == AF_INET6) {
4662                 /*
4663                  * special hook, if we are sending to link local it will not
4664                  * show up in our private address count.
4665                  */
4666                 if (IN6_IS_ADDR_LINKLOCAL(&net->ro._l_addr.sin6.sin6_addr))
4667                         cnt_inits_to = 1;
4668         }
4669 #endif
4670         if (SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
4671                 /* This case should not happen */
4672                 SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT - failed timer?\n");
4673                 return;
4674         }
4675         /* start the INIT timer */
4676         sctp_timer_start(SCTP_TIMER_TYPE_INIT, inp, stcb, net);
4677
4678         m = sctp_get_mbuf_for_msg(MCLBYTES, 1, M_NOWAIT, 1, MT_DATA);
4679         if (m == NULL) {
4680                 /* No memory, INIT timer will re-attempt. */
4681                 SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT - mbuf?\n");
4682                 return;
4683         }
4684         chunk_len = (uint16_t)sizeof(struct sctp_init_chunk);
4685         padding_len = 0;
4686         /* Now lets put the chunk header in place */
4687         init = mtod(m, struct sctp_init_chunk *);
4688         /* now the chunk header */
4689         init->ch.chunk_type = SCTP_INITIATION;
4690         init->ch.chunk_flags = 0;
4691         /* fill in later from mbuf we build */
4692         init->ch.chunk_length = 0;
4693         /* place in my tag */
4694         init->init.initiate_tag = htonl(stcb->asoc.my_vtag);
4695         /* set up some of the credits. */
4696         init->init.a_rwnd = htonl(max(inp->sctp_socket ? SCTP_SB_LIMIT_RCV(inp->sctp_socket) : 0,
4697             SCTP_MINIMAL_RWND));
4698         init->init.num_outbound_streams = htons(stcb->asoc.pre_open_streams);
4699         init->init.num_inbound_streams = htons(stcb->asoc.max_inbound_streams);
4700         init->init.initial_tsn = htonl(stcb->asoc.init_seq_number);
4701
4702         /* Adaptation layer indication parameter */
4703         if (inp->sctp_ep.adaptation_layer_indicator_provided) {
4704                 parameter_len = (uint16_t)sizeof(struct sctp_adaptation_layer_indication);
4705                 ali = (struct sctp_adaptation_layer_indication *)(mtod(m, caddr_t)+chunk_len);
4706                 ali->ph.param_type = htons(SCTP_ULP_ADAPTATION);
4707                 ali->ph.param_length = htons(parameter_len);
4708                 ali->indication = htonl(inp->sctp_ep.adaptation_layer_indicator);
4709                 chunk_len += parameter_len;
4710         }
4711
4712         /* ECN parameter */
4713         if (stcb->asoc.ecn_supported == 1) {
4714                 parameter_len = (uint16_t)sizeof(struct sctp_paramhdr);
4715                 ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
4716                 ph->param_type = htons(SCTP_ECN_CAPABLE);
4717                 ph->param_length = htons(parameter_len);
4718                 chunk_len += parameter_len;
4719         }
4720
4721         /* PR-SCTP supported parameter */
4722         if (stcb->asoc.prsctp_supported == 1) {
4723                 parameter_len = (uint16_t)sizeof(struct sctp_paramhdr);
4724                 ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
4725                 ph->param_type = htons(SCTP_PRSCTP_SUPPORTED);
4726                 ph->param_length = htons(parameter_len);
4727                 chunk_len += parameter_len;
4728         }
4729
4730         /* Add NAT friendly parameter. */
4731         if (SCTP_BASE_SYSCTL(sctp_inits_include_nat_friendly)) {
4732                 parameter_len = (uint16_t)sizeof(struct sctp_paramhdr);
4733                 ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
4734                 ph->param_type = htons(SCTP_HAS_NAT_SUPPORT);
4735                 ph->param_length = htons(parameter_len);
4736                 chunk_len += parameter_len;
4737         }
4738
4739         /* And now tell the peer which extensions we support */
4740         num_ext = 0;
4741         pr_supported = (struct sctp_supported_chunk_types_param *)(mtod(m, caddr_t)+chunk_len);
4742         if (stcb->asoc.prsctp_supported == 1) {
4743                 pr_supported->chunk_types[num_ext++] = SCTP_FORWARD_CUM_TSN;
4744                 if (stcb->asoc.idata_supported) {
4745                         pr_supported->chunk_types[num_ext++] = SCTP_IFORWARD_CUM_TSN;
4746                 }
4747         }
4748         if (stcb->asoc.auth_supported == 1) {
4749                 pr_supported->chunk_types[num_ext++] = SCTP_AUTHENTICATION;
4750         }
4751         if (stcb->asoc.asconf_supported == 1) {
4752                 pr_supported->chunk_types[num_ext++] = SCTP_ASCONF;
4753                 pr_supported->chunk_types[num_ext++] = SCTP_ASCONF_ACK;
4754         }
4755         if (stcb->asoc.reconfig_supported == 1) {
4756                 pr_supported->chunk_types[num_ext++] = SCTP_STREAM_RESET;
4757         }
4758         if (stcb->asoc.idata_supported) {
4759                 pr_supported->chunk_types[num_ext++] = SCTP_IDATA;
4760         }
4761         if (stcb->asoc.nrsack_supported == 1) {
4762                 pr_supported->chunk_types[num_ext++] = SCTP_NR_SELECTIVE_ACK;
4763         }
4764         if (stcb->asoc.pktdrop_supported == 1) {
4765                 pr_supported->chunk_types[num_ext++] = SCTP_PACKET_DROPPED;
4766         }
4767         if (num_ext > 0) {
4768                 parameter_len = (uint16_t)sizeof(struct sctp_supported_chunk_types_param) + num_ext;
4769                 pr_supported->ph.param_type = htons(SCTP_SUPPORTED_CHUNK_EXT);
4770                 pr_supported->ph.param_length = htons(parameter_len);
4771                 padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
4772                 chunk_len += parameter_len;
4773         }
4774         /* add authentication parameters */
4775         if (stcb->asoc.auth_supported) {
4776                 /* attach RANDOM parameter, if available */
4777                 if (stcb->asoc.authinfo.random != NULL) {
4778                         struct sctp_auth_random *randp;
4779
4780                         if (padding_len > 0) {
4781                                 memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
4782                                 chunk_len += padding_len;
4783                                 padding_len = 0;
4784                         }
4785                         randp = (struct sctp_auth_random *)(mtod(m, caddr_t)+chunk_len);
4786                         parameter_len = (uint16_t)sizeof(struct sctp_auth_random) + stcb->asoc.authinfo.random_len;
4787                         /* random key already contains the header */
4788                         memcpy(randp, stcb->asoc.authinfo.random->key, parameter_len);
4789                         padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
4790                         chunk_len += parameter_len;
4791                 }
4792                 /* add HMAC_ALGO parameter */
4793                 if (stcb->asoc.local_hmacs != NULL) {
4794                         struct sctp_auth_hmac_algo *hmacs;
4795
4796                         if (padding_len > 0) {
4797                                 memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
4798                                 chunk_len += padding_len;
4799                                 padding_len = 0;
4800                         }
4801                         hmacs = (struct sctp_auth_hmac_algo *)(mtod(m, caddr_t)+chunk_len);
4802                         parameter_len = (uint16_t)(sizeof(struct sctp_auth_hmac_algo) +
4803                             stcb->asoc.local_hmacs->num_algo * sizeof(uint16_t));
4804                         hmacs->ph.param_type = htons(SCTP_HMAC_LIST);
4805                         hmacs->ph.param_length = htons(parameter_len);
4806                         sctp_serialize_hmaclist(stcb->asoc.local_hmacs, (uint8_t *)hmacs->hmac_ids);
4807                         padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
4808                         chunk_len += parameter_len;
4809                 }
4810                 /* add CHUNKS parameter */
4811                 if (stcb->asoc.local_auth_chunks != NULL) {
4812                         struct sctp_auth_chunk_list *chunks;
4813
4814                         if (padding_len > 0) {
4815                                 memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
4816                                 chunk_len += padding_len;
4817                                 padding_len = 0;
4818                         }
4819                         chunks = (struct sctp_auth_chunk_list *)(mtod(m, caddr_t)+chunk_len);
4820                         parameter_len = (uint16_t)(sizeof(struct sctp_auth_chunk_list) +
4821                             sctp_auth_get_chklist_size(stcb->asoc.local_auth_chunks));
4822                         chunks->ph.param_type = htons(SCTP_CHUNK_LIST);
4823                         chunks->ph.param_length = htons(parameter_len);
4824                         sctp_serialize_auth_chunks(stcb->asoc.local_auth_chunks, chunks->chunk_types);
4825                         padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
4826                         chunk_len += parameter_len;
4827                 }
4828         }
4829
4830         /* now any cookie time extensions */
4831         if (stcb->asoc.cookie_preserve_req) {
4832                 struct sctp_cookie_perserve_param *cookie_preserve;
4833
4834                 if (padding_len > 0) {
4835                         memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
4836                         chunk_len += padding_len;
4837                         padding_len = 0;
4838                 }
4839                 parameter_len = (uint16_t)sizeof(struct sctp_cookie_perserve_param);
4840                 cookie_preserve = (struct sctp_cookie_perserve_param *)(mtod(m, caddr_t)+chunk_len);
4841                 cookie_preserve->ph.param_type = htons(SCTP_COOKIE_PRESERVE);
4842                 cookie_preserve->ph.param_length = htons(parameter_len);
4843                 cookie_preserve->time = htonl(stcb->asoc.cookie_preserve_req);
4844                 stcb->asoc.cookie_preserve_req = 0;
4845                 chunk_len += parameter_len;
4846         }
4847
4848         if (stcb->asoc.scope.ipv4_addr_legal || stcb->asoc.scope.ipv6_addr_legal) {
4849                 uint8_t i;
4850
4851                 if (padding_len > 0) {
4852                         memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
4853                         chunk_len += padding_len;
4854                         padding_len = 0;
4855                 }
4856                 parameter_len = (uint16_t)sizeof(struct sctp_paramhdr);
4857                 if (stcb->asoc.scope.ipv4_addr_legal) {
4858                         parameter_len += (uint16_t)sizeof(uint16_t);
4859                 }
4860                 if (stcb->asoc.scope.ipv6_addr_legal) {
4861                         parameter_len += (uint16_t)sizeof(uint16_t);
4862                 }
4863                 sup_addr = (struct sctp_supported_addr_param *)(mtod(m, caddr_t)+chunk_len);
4864                 sup_addr->ph.param_type = htons(SCTP_SUPPORTED_ADDRTYPE);
4865                 sup_addr->ph.param_length = htons(parameter_len);
4866                 i = 0;
4867                 if (stcb->asoc.scope.ipv4_addr_legal) {
4868                         sup_addr->addr_type[i++] = htons(SCTP_IPV4_ADDRESS);
4869                 }
4870                 if (stcb->asoc.scope.ipv6_addr_legal) {
4871                         sup_addr->addr_type[i++] = htons(SCTP_IPV6_ADDRESS);
4872                 }
4873                 padding_len = 4 - 2 * i;
4874                 chunk_len += parameter_len;
4875         }
4876
4877         SCTP_BUF_LEN(m) = chunk_len;
4878         /* now the addresses */
4879         /*
4880          * To optimize this we could put the scoping stuff into a structure
4881          * and remove the individual uint8's from the assoc structure. Then
4882          * we could just sifa in the address within the stcb. But for now
4883          * this is a quick hack to get the address stuff teased apart.
4884          */
4885         m_last = sctp_add_addresses_to_i_ia(inp, stcb, &stcb->asoc.scope,
4886             m, cnt_inits_to,
4887             &padding_len, &chunk_len);
4888
4889         init->ch.chunk_length = htons(chunk_len);
4890         if (padding_len > 0) {
4891                 if (sctp_add_pad_tombuf(m_last, padding_len) == NULL) {
4892                         sctp_m_freem(m);
4893                         return;
4894                 }
4895         }
4896         SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT - calls lowlevel_output\n");
4897         if ((error = sctp_lowlevel_chunk_output(inp, stcb, net,
4898             (struct sockaddr *)&net->ro._l_addr,
4899             m, 0, NULL, 0, 0, 0, 0,
4900             inp->sctp_lport, stcb->rport, htonl(0),
4901             net->port, NULL,
4902             0, 0,
4903             so_locked))) {
4904                 SCTPDBG(SCTP_DEBUG_OUTPUT4, "Gak send error %d\n", error);
4905                 if (error == ENOBUFS) {
4906                         stcb->asoc.ifp_had_enobuf = 1;
4907                         SCTP_STAT_INCR(sctps_lowlevelerr);
4908                 }
4909         } else {
4910                 stcb->asoc.ifp_had_enobuf = 0;
4911         }
4912         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
4913         (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
4914 }
4915
4916 struct mbuf *
4917 sctp_arethere_unrecognized_parameters(struct mbuf *in_initpkt,
4918     int param_offset, int *abort_processing,
4919     struct sctp_chunkhdr *cp,
4920     int *nat_friendly,
4921     int *cookie_found)
4922 {
4923         /*
4924          * Given a mbuf containing an INIT or INIT-ACK with the param_offset
4925          * being equal to the beginning of the params i.e. (iphlen +
4926          * sizeof(struct sctp_init_msg) parse through the parameters to the
4927          * end of the mbuf verifying that all parameters are known.
4928          *
4929          * For unknown parameters build and return a mbuf with
4930          * UNRECOGNIZED_PARAMETER errors. If the flags indicate to stop
4931          * processing this chunk stop, and set *abort_processing to 1.
4932          *
4933          * By having param_offset be pre-set to where parameters begin it is
4934          * hoped that this routine may be reused in the future by new
4935          * features.
4936          */
4937         struct sctp_paramhdr *phdr, params;
4938
4939         struct mbuf *mat, *m_tmp, *op_err, *op_err_last;
4940         int at, limit, pad_needed;
4941         uint16_t ptype, plen, padded_size;
4942
4943         *abort_processing = 0;
4944         if (cookie_found != NULL) {
4945                 *cookie_found = 0;
4946         }
4947         mat = in_initpkt;
4948         limit = ntohs(cp->chunk_length) - sizeof(struct sctp_init_chunk);
4949         at = param_offset;
4950         op_err = NULL;
4951         op_err_last = NULL;
4952         pad_needed = 0;
4953         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Check for unrecognized param's\n");
4954         phdr = sctp_get_next_param(mat, at, &params, sizeof(params));
4955         while ((phdr != NULL) && ((size_t)limit >= sizeof(struct sctp_paramhdr))) {
4956                 ptype = ntohs(phdr->param_type);
4957                 plen = ntohs(phdr->param_length);
4958                 if ((plen > limit) || (plen < sizeof(struct sctp_paramhdr))) {
4959                         /* wacked parameter */
4960                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error %d\n", plen);
4961                         goto invalid_size;
4962                 }
4963                 limit -= SCTP_SIZE32(plen);
4964                 /*-
4965                  * All parameters for all chunks that we know/understand are
4966                  * listed here. We process them other places and make
4967                  * appropriate stop actions per the upper bits. However this
4968                  * is the generic routine processor's can call to get back
4969                  * an operr.. to either incorporate (init-ack) or send.
4970                  */
4971                 padded_size = SCTP_SIZE32(plen);
4972                 switch (ptype) {
4973                         /* Param's with variable size */
4974                 case SCTP_HEARTBEAT_INFO:
4975                 case SCTP_UNRECOG_PARAM:
4976                 case SCTP_ERROR_CAUSE_IND:
4977                         /* ok skip fwd */
4978                         at += padded_size;
4979                         break;
4980                 case SCTP_STATE_COOKIE:
4981                         if (cookie_found != NULL) {
4982                                 *cookie_found = 1;
4983                         }
4984                         at += padded_size;
4985                         break;
4986                         /* Param's with variable size within a range */
4987                 case SCTP_CHUNK_LIST:
4988                 case SCTP_SUPPORTED_CHUNK_EXT:
4989                         if (padded_size > (sizeof(struct sctp_supported_chunk_types_param) + (sizeof(uint8_t) * SCTP_MAX_SUPPORTED_EXT))) {
4990                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error chklist %d\n", plen);
4991                                 goto invalid_size;
4992                         }
4993                         at += padded_size;
4994                         break;
4995                 case SCTP_SUPPORTED_ADDRTYPE:
4996                         if (padded_size > SCTP_MAX_ADDR_PARAMS_SIZE) {
4997                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error supaddrtype %d\n", plen);
4998                                 goto invalid_size;
4999                         }
5000                         at += padded_size;
5001                         break;
5002                 case SCTP_RANDOM:
5003                         if (padded_size > (sizeof(struct sctp_auth_random) + SCTP_RANDOM_MAX_SIZE)) {
5004                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error random %d\n", plen);
5005                                 goto invalid_size;
5006                         }
5007                         at += padded_size;
5008                         break;
5009                 case SCTP_SET_PRIM_ADDR:
5010                 case SCTP_DEL_IP_ADDRESS:
5011                 case SCTP_ADD_IP_ADDRESS:
5012                         if ((padded_size != sizeof(struct sctp_asconf_addrv4_param)) &&
5013                             (padded_size != sizeof(struct sctp_asconf_addr_param))) {
5014                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error setprim %d\n", plen);
5015                                 goto invalid_size;
5016                         }
5017                         at += padded_size;
5018                         break;
5019                         /* Param's with a fixed size */
5020                 case SCTP_IPV4_ADDRESS:
5021                         if (padded_size != sizeof(struct sctp_ipv4addr_param)) {
5022                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error ipv4 addr %d\n", plen);
5023                                 goto invalid_size;
5024                         }
5025                         at += padded_size;
5026                         break;
5027                 case SCTP_IPV6_ADDRESS:
5028                         if (padded_size != sizeof(struct sctp_ipv6addr_param)) {
5029                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error ipv6 addr %d\n", plen);
5030                                 goto invalid_size;
5031                         }
5032                         at += padded_size;
5033                         break;
5034                 case SCTP_COOKIE_PRESERVE:
5035                         if (padded_size != sizeof(struct sctp_cookie_perserve_param)) {
5036                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error cookie-preserve %d\n", plen);
5037                                 goto invalid_size;
5038                         }
5039                         at += padded_size;
5040                         break;
5041                 case SCTP_HAS_NAT_SUPPORT:
5042                         *nat_friendly = 1;
5043                         /* fall through */
5044                 case SCTP_PRSCTP_SUPPORTED:
5045                         if (padded_size != sizeof(struct sctp_paramhdr)) {
5046                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error prsctp/nat support %d\n", plen);
5047                                 goto invalid_size;
5048                         }
5049                         at += padded_size;
5050                         break;
5051                 case SCTP_ECN_CAPABLE:
5052                         if (padded_size != sizeof(struct sctp_paramhdr)) {
5053                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error ecn %d\n", plen);
5054                                 goto invalid_size;
5055                         }
5056                         at += padded_size;
5057                         break;
5058                 case SCTP_ULP_ADAPTATION:
5059                         if (padded_size != sizeof(struct sctp_adaptation_layer_indication)) {
5060                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error adapatation %d\n", plen);
5061                                 goto invalid_size;
5062                         }
5063                         at += padded_size;
5064                         break;
5065                 case SCTP_SUCCESS_REPORT:
5066                         if (padded_size != sizeof(struct sctp_asconf_paramhdr)) {
5067                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error success %d\n", plen);
5068                                 goto invalid_size;
5069                         }
5070                         at += padded_size;
5071                         break;
5072                 case SCTP_HOSTNAME_ADDRESS:
5073                         {
5074                                 /* Hostname parameters are deprecated. */
5075                                 struct sctp_gen_error_cause *cause;
5076                                 int l_len;
5077
5078                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Can't handle hostname addresses.. abort processing\n");
5079                                 *abort_processing = 1;
5080                                 sctp_m_freem(op_err);
5081                                 op_err = NULL;
5082                                 op_err_last = NULL;
5083 #ifdef INET6
5084                                 l_len = SCTP_MIN_OVERHEAD;
5085 #else
5086                                 l_len = SCTP_MIN_V4_OVERHEAD;
5087 #endif
5088                                 l_len += sizeof(struct sctp_chunkhdr);
5089                                 l_len += sizeof(struct sctp_gen_error_cause);
5090                                 op_err = sctp_get_mbuf_for_msg(l_len, 0, M_NOWAIT, 1, MT_DATA);
5091                                 if (op_err != NULL) {
5092                                         /*
5093                                          * Pre-reserve space for IP, SCTP,
5094                                          * and chunk header.
5095                                          */
5096 #ifdef INET6
5097                                         SCTP_BUF_RESV_UF(op_err, sizeof(struct ip6_hdr));
5098 #else
5099                                         SCTP_BUF_RESV_UF(op_err, sizeof(struct ip));
5100 #endif
5101                                         SCTP_BUF_RESV_UF(op_err, sizeof(struct sctphdr));
5102                                         SCTP_BUF_RESV_UF(op_err, sizeof(struct sctp_chunkhdr));
5103                                         SCTP_BUF_LEN(op_err) = sizeof(struct sctp_gen_error_cause);
5104                                         cause = mtod(op_err, struct sctp_gen_error_cause *);
5105                                         cause->code = htons(SCTP_CAUSE_UNRESOLVABLE_ADDR);
5106                                         cause->length = htons((uint16_t)(sizeof(struct sctp_gen_error_cause) + plen));
5107                                         SCTP_BUF_NEXT(op_err) = SCTP_M_COPYM(mat, at, plen, M_NOWAIT);
5108                                         if (SCTP_BUF_NEXT(op_err) == NULL) {
5109                                                 sctp_m_freem(op_err);
5110                                                 op_err = NULL;
5111                                                 op_err_last = NULL;
5112                                         }
5113                                 }
5114                                 return (op_err);
5115                         }
5116                 default:
5117                         /*
5118                          * we do not recognize the parameter figure out what
5119                          * we do.
5120                          */
5121                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Hit default param %x\n", ptype);
5122                         if ((ptype & 0x4000) == 0x4000) {
5123                                 /* Report bit is set?? */
5124                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "report op err\n");
5125                                 if (op_err == NULL) {
5126                                         int l_len;
5127
5128                                         /* Ok need to try to get an mbuf */
5129 #ifdef INET6
5130                                         l_len = SCTP_MIN_OVERHEAD;
5131 #else
5132                                         l_len = SCTP_MIN_V4_OVERHEAD;
5133 #endif
5134                                         l_len += sizeof(struct sctp_chunkhdr);
5135                                         l_len += sizeof(struct sctp_paramhdr);
5136                                         op_err = sctp_get_mbuf_for_msg(l_len, 0, M_NOWAIT, 1, MT_DATA);
5137                                         if (op_err) {
5138                                                 SCTP_BUF_LEN(op_err) = 0;
5139 #ifdef INET6
5140                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip6_hdr));
5141 #else
5142                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip));
5143 #endif
5144                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctphdr));
5145                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctp_chunkhdr));
5146                                                 op_err_last = op_err;
5147                                         }
5148                                 }
5149                                 if (op_err != NULL) {
5150                                         /* If we have space */
5151                                         struct sctp_paramhdr *param;
5152
5153                                         if (pad_needed > 0) {
5154                                                 op_err_last = sctp_add_pad_tombuf(op_err_last, pad_needed);
5155                                         }
5156                                         if (op_err_last == NULL) {
5157                                                 sctp_m_freem(op_err);
5158                                                 op_err = NULL;
5159                                                 op_err_last = NULL;
5160                                                 goto more_processing;
5161                                         }
5162                                         if (M_TRAILINGSPACE(op_err_last) < (int)sizeof(struct sctp_paramhdr)) {
5163                                                 m_tmp = sctp_get_mbuf_for_msg(sizeof(struct sctp_paramhdr), 0, M_NOWAIT, 1, MT_DATA);
5164                                                 if (m_tmp == NULL) {
5165                                                         sctp_m_freem(op_err);
5166                                                         op_err = NULL;
5167                                                         op_err_last = NULL;
5168                                                         goto more_processing;
5169                                                 }
5170                                                 SCTP_BUF_LEN(m_tmp) = 0;
5171                                                 SCTP_BUF_NEXT(m_tmp) = NULL;
5172                                                 SCTP_BUF_NEXT(op_err_last) = m_tmp;
5173                                                 op_err_last = m_tmp;
5174                                         }
5175                                         param = (struct sctp_paramhdr *)(mtod(op_err_last, caddr_t)+SCTP_BUF_LEN(op_err_last));
5176                                         param->param_type = htons(SCTP_UNRECOG_PARAM);
5177                                         param->param_length = htons((uint16_t)sizeof(struct sctp_paramhdr) + plen);
5178                                         SCTP_BUF_LEN(op_err_last) += sizeof(struct sctp_paramhdr);
5179                                         SCTP_BUF_NEXT(op_err_last) = SCTP_M_COPYM(mat, at, plen, M_NOWAIT);
5180                                         if (SCTP_BUF_NEXT(op_err_last) == NULL) {
5181                                                 sctp_m_freem(op_err);
5182                                                 op_err = NULL;
5183                                                 op_err_last = NULL;
5184                                                 goto more_processing;
5185                                         } else {
5186                                                 while (SCTP_BUF_NEXT(op_err_last) != NULL) {
5187                                                         op_err_last = SCTP_BUF_NEXT(op_err_last);
5188                                                 }
5189                                         }
5190                                         if (plen % 4 != 0) {
5191                                                 pad_needed = 4 - (plen % 4);
5192                                         } else {
5193                                                 pad_needed = 0;
5194                                         }
5195                                 }
5196                         }
5197         more_processing:
5198                         if ((ptype & 0x8000) == 0x0000) {
5199                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "stop proc\n");
5200                                 return (op_err);
5201                         } else {
5202                                 /* skip this chunk and continue processing */
5203                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "move on\n");
5204                                 at += SCTP_SIZE32(plen);
5205                         }
5206                         break;
5207
5208                 }
5209                 phdr = sctp_get_next_param(mat, at, &params, sizeof(params));
5210         }
5211         return (op_err);
5212 invalid_size:
5213         SCTPDBG(SCTP_DEBUG_OUTPUT1, "abort flag set\n");
5214         *abort_processing = 1;
5215         sctp_m_freem(op_err);
5216         op_err = NULL;
5217         op_err_last = NULL;
5218         if (phdr != NULL) {
5219                 struct sctp_paramhdr *param;
5220                 int l_len;
5221 #ifdef INET6
5222                 l_len = SCTP_MIN_OVERHEAD;
5223 #else
5224                 l_len = SCTP_MIN_V4_OVERHEAD;
5225 #endif
5226                 l_len += sizeof(struct sctp_chunkhdr);
5227                 l_len += (2 * sizeof(struct sctp_paramhdr));
5228                 op_err = sctp_get_mbuf_for_msg(l_len, 0, M_NOWAIT, 1, MT_DATA);
5229                 if (op_err) {
5230                         SCTP_BUF_LEN(op_err) = 0;
5231 #ifdef INET6
5232                         SCTP_BUF_RESV_UF(op_err, sizeof(struct ip6_hdr));
5233 #else
5234                         SCTP_BUF_RESV_UF(op_err, sizeof(struct ip));
5235 #endif
5236                         SCTP_BUF_RESV_UF(op_err, sizeof(struct sctphdr));
5237                         SCTP_BUF_RESV_UF(op_err, sizeof(struct sctp_chunkhdr));
5238                         SCTP_BUF_LEN(op_err) = 2 * sizeof(struct sctp_paramhdr);
5239                         param = mtod(op_err, struct sctp_paramhdr *);
5240                         param->param_type = htons(SCTP_CAUSE_PROTOCOL_VIOLATION);
5241                         param->param_length = htons(2 * sizeof(struct sctp_paramhdr));
5242                         param++;
5243                         param->param_type = htons(ptype);
5244                         param->param_length = htons(plen);
5245                 }
5246         }
5247         return (op_err);
5248 }
5249
5250 static int
5251 sctp_are_there_new_addresses(struct sctp_association *asoc,
5252     struct mbuf *in_initpkt, int offset, struct sockaddr *src)
5253 {
5254         /*
5255          * Given a INIT packet, look through the packet to verify that there
5256          * are NO new addresses. As we go through the parameters add reports
5257          * of any un-understood parameters that require an error.  Also we
5258          * must return (1) to drop the packet if we see a un-understood
5259          * parameter that tells us to drop the chunk.
5260          */
5261         struct sockaddr *sa_touse;
5262         struct sockaddr *sa;
5263         struct sctp_paramhdr *phdr, params;
5264         uint16_t ptype, plen;
5265         uint8_t fnd;
5266         struct sctp_nets *net;
5267         int check_src;
5268 #ifdef INET
5269         struct sockaddr_in sin4, *sa4;
5270 #endif
5271 #ifdef INET6
5272         struct sockaddr_in6 sin6, *sa6;
5273 #endif
5274
5275 #ifdef INET
5276         memset(&sin4, 0, sizeof(sin4));
5277         sin4.sin_family = AF_INET;
5278         sin4.sin_len = sizeof(sin4);
5279 #endif
5280 #ifdef INET6
5281         memset(&sin6, 0, sizeof(sin6));
5282         sin6.sin6_family = AF_INET6;
5283         sin6.sin6_len = sizeof(sin6);
5284 #endif
5285         /* First what about the src address of the pkt ? */
5286         check_src = 0;
5287         switch (src->sa_family) {
5288 #ifdef INET
5289         case AF_INET:
5290                 if (asoc->scope.ipv4_addr_legal) {
5291                         check_src = 1;
5292                 }
5293                 break;
5294 #endif
5295 #ifdef INET6
5296         case AF_INET6:
5297                 if (asoc->scope.ipv6_addr_legal) {
5298                         check_src = 1;
5299                 }
5300                 break;
5301 #endif
5302         default:
5303                 /* TSNH */
5304                 break;
5305         }
5306         if (check_src) {
5307                 fnd = 0;
5308                 TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
5309                         sa = (struct sockaddr *)&net->ro._l_addr;
5310                         if (sa->sa_family == src->sa_family) {
5311 #ifdef INET
5312                                 if (sa->sa_family == AF_INET) {
5313                                         struct sockaddr_in *src4;
5314
5315                                         sa4 = (struct sockaddr_in *)sa;
5316                                         src4 = (struct sockaddr_in *)src;
5317                                         if (sa4->sin_addr.s_addr == src4->sin_addr.s_addr) {
5318                                                 fnd = 1;
5319                                                 break;
5320                                         }
5321                                 }
5322 #endif
5323 #ifdef INET6
5324                                 if (sa->sa_family == AF_INET6) {
5325                                         struct sockaddr_in6 *src6;
5326
5327                                         sa6 = (struct sockaddr_in6 *)sa;
5328                                         src6 = (struct sockaddr_in6 *)src;
5329                                         if (SCTP6_ARE_ADDR_EQUAL(sa6, src6)) {
5330                                                 fnd = 1;
5331                                                 break;
5332                                         }
5333                                 }
5334 #endif
5335                         }
5336                 }
5337                 if (fnd == 0) {
5338                         /* New address added! no need to look further. */
5339                         return (1);
5340                 }
5341         }
5342         /* Ok so far lets munge through the rest of the packet */
5343         offset += sizeof(struct sctp_init_chunk);
5344         phdr = sctp_get_next_param(in_initpkt, offset, &params, sizeof(params));
5345         while (phdr) {
5346                 sa_touse = NULL;
5347                 ptype = ntohs(phdr->param_type);
5348                 plen = ntohs(phdr->param_length);
5349                 switch (ptype) {
5350 #ifdef INET
5351                 case SCTP_IPV4_ADDRESS:
5352                         {
5353                                 struct sctp_ipv4addr_param *p4, p4_buf;
5354
5355                                 if (plen != sizeof(struct sctp_ipv4addr_param)) {
5356                                         return (1);
5357                                 }
5358                                 phdr = sctp_get_next_param(in_initpkt, offset,
5359                                     (struct sctp_paramhdr *)&p4_buf, sizeof(p4_buf));
5360                                 if (phdr == NULL) {
5361                                         return (1);
5362                                 }
5363                                 if (asoc->scope.ipv4_addr_legal) {
5364                                         p4 = (struct sctp_ipv4addr_param *)phdr;
5365                                         sin4.sin_addr.s_addr = p4->addr;
5366                                         sa_touse = (struct sockaddr *)&sin4;
5367                                 }
5368                                 break;
5369                         }
5370 #endif
5371 #ifdef INET6
5372                 case SCTP_IPV6_ADDRESS:
5373                         {
5374                                 struct sctp_ipv6addr_param *p6, p6_buf;
5375
5376                                 if (plen != sizeof(struct sctp_ipv6addr_param)) {
5377                                         return (1);
5378                                 }
5379                                 phdr = sctp_get_next_param(in_initpkt, offset,
5380                                     (struct sctp_paramhdr *)&p6_buf, sizeof(p6_buf));
5381                                 if (phdr == NULL) {
5382                                         return (1);
5383                                 }
5384                                 if (asoc->scope.ipv6_addr_legal) {
5385                                         p6 = (struct sctp_ipv6addr_param *)phdr;
5386                                         memcpy((caddr_t)&sin6.sin6_addr, p6->addr,
5387                                             sizeof(p6->addr));
5388                                         sa_touse = (struct sockaddr *)&sin6;
5389                                 }
5390                                 break;
5391                         }
5392 #endif
5393                 default:
5394                         sa_touse = NULL;
5395                         break;
5396                 }
5397                 if (sa_touse) {
5398                         /* ok, sa_touse points to one to check */
5399                         fnd = 0;
5400                         TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
5401                                 sa = (struct sockaddr *)&net->ro._l_addr;
5402                                 if (sa->sa_family != sa_touse->sa_family) {
5403                                         continue;
5404                                 }
5405 #ifdef INET
5406                                 if (sa->sa_family == AF_INET) {
5407                                         sa4 = (struct sockaddr_in *)sa;
5408                                         if (sa4->sin_addr.s_addr ==
5409                                             sin4.sin_addr.s_addr) {
5410                                                 fnd = 1;
5411                                                 break;
5412                                         }
5413                                 }
5414 #endif
5415 #ifdef INET6
5416                                 if (sa->sa_family == AF_INET6) {
5417                                         sa6 = (struct sockaddr_in6 *)sa;
5418                                         if (SCTP6_ARE_ADDR_EQUAL(
5419                                             sa6, &sin6)) {
5420                                                 fnd = 1;
5421                                                 break;
5422                                         }
5423                                 }
5424 #endif
5425                         }
5426                         if (!fnd) {
5427                                 /* New addr added! no need to look further */
5428                                 return (1);
5429                         }
5430                 }
5431                 offset += SCTP_SIZE32(plen);
5432                 phdr = sctp_get_next_param(in_initpkt, offset, &params, sizeof(params));
5433         }
5434         return (0);
5435 }
5436
5437 /*
5438  * Given a MBUF chain that was sent into us containing an INIT. Build a
5439  * INIT-ACK with COOKIE and send back. We assume that the in_initpkt has done
5440  * a pullup to include IPv6/4header, SCTP header and initial part of INIT
5441  * message (i.e. the struct sctp_init_msg).
5442  */
5443 void
5444 sctp_send_initiate_ack(struct sctp_inpcb *inp, struct sctp_tcb *stcb,
5445     struct sctp_nets *src_net, struct mbuf *init_pkt,
5446     int iphlen, int offset,
5447     struct sockaddr *src, struct sockaddr *dst,
5448     struct sctphdr *sh, struct sctp_init_chunk *init_chk,
5449     uint8_t mflowtype, uint32_t mflowid,
5450     uint32_t vrf_id, uint16_t port)
5451 {
5452         struct sctp_association *asoc;
5453         struct mbuf *m, *m_tmp, *m_last, *m_cookie, *op_err;
5454         struct sctp_init_ack_chunk *initack;
5455         struct sctp_adaptation_layer_indication *ali;
5456         struct sctp_supported_chunk_types_param *pr_supported;
5457         struct sctp_paramhdr *ph;
5458         union sctp_sockstore *over_addr;
5459         struct sctp_scoping scp;
5460         struct timeval now;
5461 #ifdef INET
5462         struct sockaddr_in *dst4 = (struct sockaddr_in *)dst;
5463         struct sockaddr_in *src4 = (struct sockaddr_in *)src;
5464         struct sockaddr_in *sin;
5465 #endif
5466 #ifdef INET6
5467         struct sockaddr_in6 *dst6 = (struct sockaddr_in6 *)dst;
5468         struct sockaddr_in6 *src6 = (struct sockaddr_in6 *)src;
5469         struct sockaddr_in6 *sin6;
5470 #endif
5471         struct sockaddr *to;
5472         struct sctp_state_cookie stc;
5473         struct sctp_nets *net = NULL;
5474         uint8_t *signature = NULL;
5475         int cnt_inits_to = 0;
5476         uint16_t his_limit, i_want;
5477         int abort_flag;
5478         int nat_friendly = 0;
5479         int error;
5480         struct socket *so;
5481         uint16_t num_ext, chunk_len, padding_len, parameter_len;
5482
5483         if (stcb) {
5484                 asoc = &stcb->asoc;
5485         } else {
5486                 asoc = NULL;
5487         }
5488         if ((asoc != NULL) &&
5489             (SCTP_GET_STATE(stcb) != SCTP_STATE_COOKIE_WAIT)) {
5490                 if (sctp_are_there_new_addresses(asoc, init_pkt, offset, src)) {
5491                         /*
5492                          * new addresses, out of here in non-cookie-wait
5493                          * states
5494                          *
5495                          * Send an ABORT, without the new address error
5496                          * cause. This looks no different than if no
5497                          * listener was present.
5498                          */
5499                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
5500                             "Address added");
5501                         sctp_send_abort(init_pkt, iphlen, src, dst, sh, 0, op_err,
5502                             mflowtype, mflowid, inp->fibnum,
5503                             vrf_id, port);
5504                         return;
5505                 }
5506                 if (src_net != NULL && (src_net->port != port)) {
5507                         /*
5508                          * change of remote encapsulation port, out of here
5509                          * in non-cookie-wait states
5510                          *
5511                          * Send an ABORT, without an specific error cause.
5512                          * This looks no different than if no listener was
5513                          * present.
5514                          */
5515                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
5516                             "Remote encapsulation port changed");
5517                         sctp_send_abort(init_pkt, iphlen, src, dst, sh, 0, op_err,
5518                             mflowtype, mflowid, inp->fibnum,
5519                             vrf_id, port);
5520                         return;
5521                 }
5522         }
5523         abort_flag = 0;
5524         op_err = sctp_arethere_unrecognized_parameters(init_pkt,
5525             (offset + sizeof(struct sctp_init_chunk)),
5526             &abort_flag,
5527             (struct sctp_chunkhdr *)init_chk,
5528             &nat_friendly, NULL);
5529         if (abort_flag) {
5530 do_a_abort:
5531                 if (op_err == NULL) {
5532                         char msg[SCTP_DIAG_INFO_LEN];
5533
5534                         SCTP_SNPRINTF(msg, sizeof(msg), "%s:%d at %s", __FILE__, __LINE__, __func__);
5535                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
5536                             msg);
5537                 }
5538                 sctp_send_abort(init_pkt, iphlen, src, dst, sh,
5539                     init_chk->init.initiate_tag, op_err,
5540                     mflowtype, mflowid, inp->fibnum,
5541                     vrf_id, port);
5542                 return;
5543         }
5544         m = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
5545         if (m == NULL) {
5546                 /* No memory, INIT timer will re-attempt. */
5547                 sctp_m_freem(op_err);
5548                 return;
5549         }
5550         chunk_len = (uint16_t)sizeof(struct sctp_init_ack_chunk);
5551         padding_len = 0;
5552
5553         /*
5554          * We might not overwrite the identification[] completely and on
5555          * some platforms time_entered will contain some padding. Therefore
5556          * zero out the cookie to avoid putting uninitialized memory on the
5557          * wire.
5558          */
5559         memset(&stc, 0, sizeof(struct sctp_state_cookie));
5560
5561         /* the time I built cookie */
5562         (void)SCTP_GETTIME_TIMEVAL(&now);
5563         stc.time_entered.tv_sec = now.tv_sec;
5564         stc.time_entered.tv_usec = now.tv_usec;
5565
5566         /* populate any tie tags */
5567         if (asoc != NULL) {
5568                 /* unlock before tag selections */
5569                 stc.tie_tag_my_vtag = asoc->my_vtag_nonce;
5570                 stc.tie_tag_peer_vtag = asoc->peer_vtag_nonce;
5571                 stc.cookie_life = asoc->cookie_life;
5572                 net = asoc->primary_destination;
5573         } else {
5574                 stc.tie_tag_my_vtag = 0;
5575                 stc.tie_tag_peer_vtag = 0;
5576                 /* life I will award this cookie */
5577                 stc.cookie_life = inp->sctp_ep.def_cookie_life;
5578         }
5579
5580         /* copy in the ports for later check */
5581         stc.myport = sh->dest_port;
5582         stc.peerport = sh->src_port;
5583
5584         /*
5585          * If we wanted to honor cookie life extensions, we would add to
5586          * stc.cookie_life. For now we should NOT honor any extension
5587          */
5588         stc.site_scope = stc.local_scope = stc.loopback_scope = 0;
5589         if (inp->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
5590                 stc.ipv6_addr_legal = 1;
5591                 if (SCTP_IPV6_V6ONLY(inp)) {
5592                         stc.ipv4_addr_legal = 0;
5593                 } else {
5594                         stc.ipv4_addr_legal = 1;
5595                 }
5596         } else {
5597                 stc.ipv6_addr_legal = 0;
5598                 stc.ipv4_addr_legal = 1;
5599         }
5600         stc.ipv4_scope = 0;
5601         if (net == NULL) {
5602                 to = src;
5603                 switch (dst->sa_family) {
5604 #ifdef INET
5605                 case AF_INET:
5606                         {
5607                                 /* lookup address */
5608                                 stc.address[0] = src4->sin_addr.s_addr;
5609                                 stc.address[1] = 0;
5610                                 stc.address[2] = 0;
5611                                 stc.address[3] = 0;
5612                                 stc.addr_type = SCTP_IPV4_ADDRESS;
5613                                 /* local from address */
5614                                 stc.laddress[0] = dst4->sin_addr.s_addr;
5615                                 stc.laddress[1] = 0;
5616                                 stc.laddress[2] = 0;
5617                                 stc.laddress[3] = 0;
5618                                 stc.laddr_type = SCTP_IPV4_ADDRESS;
5619                                 /* scope_id is only for v6 */
5620                                 stc.scope_id = 0;
5621                                 if ((IN4_ISPRIVATE_ADDRESS(&src4->sin_addr)) ||
5622                                     (IN4_ISPRIVATE_ADDRESS(&dst4->sin_addr))) {
5623                                         stc.ipv4_scope = 1;
5624                                 }
5625                                 /* Must use the address in this case */
5626                                 if (sctp_is_address_on_local_host(src, vrf_id)) {
5627                                         stc.loopback_scope = 1;
5628                                         stc.ipv4_scope = 1;
5629                                         stc.site_scope = 1;
5630                                         stc.local_scope = 0;
5631                                 }
5632                                 break;
5633                         }
5634 #endif
5635 #ifdef INET6
5636                 case AF_INET6:
5637                         {
5638                                 stc.addr_type = SCTP_IPV6_ADDRESS;
5639                                 memcpy(&stc.address, &src6->sin6_addr, sizeof(struct in6_addr));
5640                                 stc.scope_id = ntohs(in6_getscope(&src6->sin6_addr));
5641                                 if (sctp_is_address_on_local_host(src, vrf_id)) {
5642                                         stc.loopback_scope = 1;
5643                                         stc.local_scope = 0;
5644                                         stc.site_scope = 1;
5645                                         stc.ipv4_scope = 1;
5646                                 } else if (IN6_IS_ADDR_LINKLOCAL(&src6->sin6_addr) ||
5647                                     IN6_IS_ADDR_LINKLOCAL(&dst6->sin6_addr)) {
5648                                         /*
5649                                          * If the new destination or source
5650                                          * is a LINK_LOCAL we must have
5651                                          * common both site and local scope.
5652                                          * Don't set local scope though
5653                                          * since we must depend on the
5654                                          * source to be added implicitly. We
5655                                          * cannot assure just because we
5656                                          * share one link that all links are
5657                                          * common.
5658                                          */
5659                                         stc.local_scope = 0;
5660                                         stc.site_scope = 1;
5661                                         stc.ipv4_scope = 1;
5662                                         /*
5663                                          * we start counting for the private
5664                                          * address stuff at 1. since the
5665                                          * link local we source from won't
5666                                          * show up in our scoped count.
5667                                          */
5668                                         cnt_inits_to = 1;
5669                                         /*
5670                                          * pull out the scope_id from
5671                                          * incoming pkt
5672                                          */
5673                                 } else if (IN6_IS_ADDR_SITELOCAL(&src6->sin6_addr) ||
5674                                     IN6_IS_ADDR_SITELOCAL(&dst6->sin6_addr)) {
5675                                         /*
5676                                          * If the new destination or source
5677                                          * is SITE_LOCAL then we must have
5678                                          * site scope in common.
5679                                          */
5680                                         stc.site_scope = 1;
5681                                 }
5682                                 memcpy(&stc.laddress, &dst6->sin6_addr, sizeof(struct in6_addr));
5683                                 stc.laddr_type = SCTP_IPV6_ADDRESS;
5684                                 break;
5685                         }
5686 #endif
5687                 default:
5688                         /* TSNH */
5689                         goto do_a_abort;
5690                         break;
5691                 }
5692         } else {
5693                 /* set the scope per the existing tcb */
5694
5695 #ifdef INET6
5696                 struct sctp_nets *lnet;
5697 #endif
5698
5699                 stc.loopback_scope = asoc->scope.loopback_scope;
5700                 stc.ipv4_scope = asoc->scope.ipv4_local_scope;
5701                 stc.site_scope = asoc->scope.site_scope;
5702                 stc.local_scope = asoc->scope.local_scope;
5703 #ifdef INET6
5704                 /* Why do we not consider IPv4 LL addresses? */
5705                 TAILQ_FOREACH(lnet, &asoc->nets, sctp_next) {
5706                         if (lnet->ro._l_addr.sin6.sin6_family == AF_INET6) {
5707                                 if (IN6_IS_ADDR_LINKLOCAL(&lnet->ro._l_addr.sin6.sin6_addr)) {
5708                                         /*
5709                                          * if we have a LL address, start
5710                                          * counting at 1.
5711                                          */
5712                                         cnt_inits_to = 1;
5713                                 }
5714                         }
5715                 }
5716 #endif
5717                 /* use the net pointer */
5718                 to = (struct sockaddr *)&net->ro._l_addr;
5719                 switch (to->sa_family) {
5720 #ifdef INET
5721                 case AF_INET:
5722                         sin = (struct sockaddr_in *)to;
5723                         stc.address[0] = sin->sin_addr.s_addr;
5724                         stc.address[1] = 0;
5725                         stc.address[2] = 0;
5726                         stc.address[3] = 0;
5727                         stc.addr_type = SCTP_IPV4_ADDRESS;
5728                         if (net->src_addr_selected == 0) {
5729                                 /*
5730                                  * strange case here, the INIT should have
5731                                  * did the selection.
5732                                  */
5733                                 net->ro._s_addr = sctp_source_address_selection(inp,
5734                                     stcb, (sctp_route_t *)&net->ro,
5735                                     net, 0, vrf_id);
5736                                 if (net->ro._s_addr == NULL) {
5737                                         sctp_m_freem(op_err);
5738                                         sctp_m_freem(m);
5739                                         return;
5740                                 }
5741
5742                                 net->src_addr_selected = 1;
5743
5744                         }
5745                         stc.laddress[0] = net->ro._s_addr->address.sin.sin_addr.s_addr;
5746                         stc.laddress[1] = 0;
5747                         stc.laddress[2] = 0;
5748                         stc.laddress[3] = 0;
5749                         stc.laddr_type = SCTP_IPV4_ADDRESS;
5750                         /* scope_id is only for v6 */
5751                         stc.scope_id = 0;
5752                         break;
5753 #endif
5754 #ifdef INET6
5755                 case AF_INET6:
5756                         sin6 = (struct sockaddr_in6 *)to;
5757                         memcpy(&stc.address, &sin6->sin6_addr,
5758                             sizeof(struct in6_addr));
5759                         stc.addr_type = SCTP_IPV6_ADDRESS;
5760                         stc.scope_id = sin6->sin6_scope_id;
5761                         if (net->src_addr_selected == 0) {
5762                                 /*
5763                                  * strange case here, the INIT should have
5764                                  * done the selection.
5765                                  */
5766                                 net->ro._s_addr = sctp_source_address_selection(inp,
5767                                     stcb, (sctp_route_t *)&net->ro,
5768                                     net, 0, vrf_id);
5769                                 if (net->ro._s_addr == NULL) {
5770                                         sctp_m_freem(op_err);
5771                                         sctp_m_freem(m);
5772                                         return;
5773                                 }
5774
5775                                 net->src_addr_selected = 1;
5776                         }
5777                         memcpy(&stc.laddress, &net->ro._s_addr->address.sin6.sin6_addr,
5778                             sizeof(struct in6_addr));
5779                         stc.laddr_type = SCTP_IPV6_ADDRESS;
5780                         break;
5781 #endif
5782                 }
5783         }
5784         /* Now lets put the SCTP header in place */
5785         initack = mtod(m, struct sctp_init_ack_chunk *);
5786         /* Save it off for quick ref */
5787         stc.peers_vtag = ntohl(init_chk->init.initiate_tag);
5788         /* who are we */
5789         memcpy(stc.identification, SCTP_VERSION_STRING,
5790             min(strlen(SCTP_VERSION_STRING), sizeof(stc.identification)));
5791         memset(stc.reserved, 0, SCTP_RESERVE_SPACE);
5792         /* now the chunk header */
5793         initack->ch.chunk_type = SCTP_INITIATION_ACK;
5794         initack->ch.chunk_flags = 0;
5795         /* fill in later from mbuf we build */
5796         initack->ch.chunk_length = 0;
5797         /* place in my tag */
5798         if ((asoc != NULL) &&
5799             ((SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_WAIT) ||
5800             (SCTP_GET_STATE(stcb) == SCTP_STATE_INUSE) ||
5801             (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED))) {
5802                 /* re-use the v-tags and init-seq here */
5803                 initack->init.initiate_tag = htonl(asoc->my_vtag);
5804                 initack->init.initial_tsn = htonl(asoc->init_seq_number);
5805         } else {
5806                 uint32_t vtag, itsn;
5807
5808                 if (asoc) {
5809                         atomic_add_int(&asoc->refcnt, 1);
5810                         SCTP_TCB_UNLOCK(stcb);
5811         new_tag:
5812                         vtag = sctp_select_a_tag(inp, inp->sctp_lport, sh->src_port, 1);
5813                         if ((asoc->peer_supports_nat) && (vtag == asoc->my_vtag)) {
5814                                 /*
5815                                  * Got a duplicate vtag on some guy behind a
5816                                  * nat make sure we don't use it.
5817                                  */
5818                                 goto new_tag;
5819                         }
5820                         initack->init.initiate_tag = htonl(vtag);
5821                         /* get a TSN to use too */
5822                         itsn = sctp_select_initial_TSN(&inp->sctp_ep);
5823                         initack->init.initial_tsn = htonl(itsn);
5824                         SCTP_TCB_LOCK(stcb);
5825                         atomic_add_int(&asoc->refcnt, -1);
5826                 } else {
5827                         SCTP_INP_INCR_REF(inp);
5828                         SCTP_INP_RUNLOCK(inp);
5829                         vtag = sctp_select_a_tag(inp, inp->sctp_lport, sh->src_port, 1);
5830                         initack->init.initiate_tag = htonl(vtag);
5831                         /* get a TSN to use too */
5832                         initack->init.initial_tsn = htonl(sctp_select_initial_TSN(&inp->sctp_ep));
5833                         SCTP_INP_RLOCK(inp);
5834                         SCTP_INP_DECR_REF(inp);
5835                 }
5836         }
5837         /* save away my tag to */
5838         stc.my_vtag = initack->init.initiate_tag;
5839
5840         /* set up some of the credits. */
5841         so = inp->sctp_socket;
5842         if (so == NULL) {
5843                 /* memory problem */
5844                 sctp_m_freem(op_err);
5845                 sctp_m_freem(m);
5846                 return;
5847         } else {
5848                 initack->init.a_rwnd = htonl(max(SCTP_SB_LIMIT_RCV(so), SCTP_MINIMAL_RWND));
5849         }
5850         /* set what I want */
5851         his_limit = ntohs(init_chk->init.num_inbound_streams);
5852         /* choose what I want */
5853         if (asoc != NULL) {
5854                 if (asoc->streamoutcnt > asoc->pre_open_streams) {
5855                         i_want = asoc->streamoutcnt;
5856                 } else {
5857                         i_want = asoc->pre_open_streams;
5858                 }
5859         } else {
5860                 i_want = inp->sctp_ep.pre_open_stream_count;
5861         }
5862         if (his_limit < i_want) {
5863                 /* I Want more :< */
5864                 initack->init.num_outbound_streams = init_chk->init.num_inbound_streams;
5865         } else {
5866                 /* I can have what I want :> */
5867                 initack->init.num_outbound_streams = htons(i_want);
5868         }
5869         /* tell him his limit. */
5870         initack->init.num_inbound_streams =
5871             htons(inp->sctp_ep.max_open_streams_intome);
5872
5873         /* adaptation layer indication parameter */
5874         if (inp->sctp_ep.adaptation_layer_indicator_provided) {
5875                 parameter_len = (uint16_t)sizeof(struct sctp_adaptation_layer_indication);
5876                 ali = (struct sctp_adaptation_layer_indication *)(mtod(m, caddr_t)+chunk_len);
5877                 ali->ph.param_type = htons(SCTP_ULP_ADAPTATION);
5878                 ali->ph.param_length = htons(parameter_len);
5879                 ali->indication = htonl(inp->sctp_ep.adaptation_layer_indicator);
5880                 chunk_len += parameter_len;
5881         }
5882
5883         /* ECN parameter */
5884         if (((asoc != NULL) && (asoc->ecn_supported == 1)) ||
5885             ((asoc == NULL) && (inp->ecn_supported == 1))) {
5886                 parameter_len = (uint16_t)sizeof(struct sctp_paramhdr);
5887                 ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
5888                 ph->param_type = htons(SCTP_ECN_CAPABLE);
5889                 ph->param_length = htons(parameter_len);
5890                 chunk_len += parameter_len;
5891         }
5892
5893         /* PR-SCTP supported parameter */
5894         if (((asoc != NULL) && (asoc->prsctp_supported == 1)) ||
5895             ((asoc == NULL) && (inp->prsctp_supported == 1))) {
5896                 parameter_len = (uint16_t)sizeof(struct sctp_paramhdr);
5897                 ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
5898                 ph->param_type = htons(SCTP_PRSCTP_SUPPORTED);
5899                 ph->param_length = htons(parameter_len);
5900                 chunk_len += parameter_len;
5901         }
5902
5903         /* Add NAT friendly parameter */
5904         if (nat_friendly) {
5905                 parameter_len = (uint16_t)sizeof(struct sctp_paramhdr);
5906                 ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
5907                 ph->param_type = htons(SCTP_HAS_NAT_SUPPORT);
5908                 ph->param_length = htons(parameter_len);
5909                 chunk_len += parameter_len;
5910         }
5911
5912         /* And now tell the peer which extensions we support */
5913         num_ext = 0;
5914         pr_supported = (struct sctp_supported_chunk_types_param *)(mtod(m, caddr_t)+chunk_len);
5915         if (((asoc != NULL) && (asoc->prsctp_supported == 1)) ||
5916             ((asoc == NULL) && (inp->prsctp_supported == 1))) {
5917                 pr_supported->chunk_types[num_ext++] = SCTP_FORWARD_CUM_TSN;
5918                 if (((asoc != NULL) && (asoc->idata_supported == 1)) ||
5919                     ((asoc == NULL) && (inp->idata_supported == 1))) {
5920                         pr_supported->chunk_types[num_ext++] = SCTP_IFORWARD_CUM_TSN;
5921                 }
5922         }
5923         if (((asoc != NULL) && (asoc->auth_supported == 1)) ||
5924             ((asoc == NULL) && (inp->auth_supported == 1))) {
5925                 pr_supported->chunk_types[num_ext++] = SCTP_AUTHENTICATION;
5926         }
5927         if (((asoc != NULL) && (asoc->asconf_supported == 1)) ||
5928             ((asoc == NULL) && (inp->asconf_supported == 1))) {
5929                 pr_supported->chunk_types[num_ext++] = SCTP_ASCONF;
5930                 pr_supported->chunk_types[num_ext++] = SCTP_ASCONF_ACK;
5931         }
5932         if (((asoc != NULL) && (asoc->reconfig_supported == 1)) ||
5933             ((asoc == NULL) && (inp->reconfig_supported == 1))) {
5934                 pr_supported->chunk_types[num_ext++] = SCTP_STREAM_RESET;
5935         }
5936         if (((asoc != NULL) && (asoc->idata_supported == 1)) ||
5937             ((asoc == NULL) && (inp->idata_supported == 1))) {
5938                 pr_supported->chunk_types[num_ext++] = SCTP_IDATA;
5939         }
5940         if (((asoc != NULL) && (asoc->nrsack_supported == 1)) ||
5941             ((asoc == NULL) && (inp->nrsack_supported == 1))) {
5942                 pr_supported->chunk_types[num_ext++] = SCTP_NR_SELECTIVE_ACK;
5943         }
5944         if (((asoc != NULL) && (asoc->pktdrop_supported == 1)) ||
5945             ((asoc == NULL) && (inp->pktdrop_supported == 1))) {
5946                 pr_supported->chunk_types[num_ext++] = SCTP_PACKET_DROPPED;
5947         }
5948         if (num_ext > 0) {
5949                 parameter_len = (uint16_t)sizeof(struct sctp_supported_chunk_types_param) + num_ext;
5950                 pr_supported->ph.param_type = htons(SCTP_SUPPORTED_CHUNK_EXT);
5951                 pr_supported->ph.param_length = htons(parameter_len);
5952                 padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
5953                 chunk_len += parameter_len;
5954         }
5955
5956         /* add authentication parameters */
5957         if (((asoc != NULL) && (asoc->auth_supported == 1)) ||
5958             ((asoc == NULL) && (inp->auth_supported == 1))) {
5959                 struct sctp_auth_random *randp;
5960                 struct sctp_auth_hmac_algo *hmacs;
5961                 struct sctp_auth_chunk_list *chunks;
5962
5963                 if (padding_len > 0) {
5964                         memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
5965                         chunk_len += padding_len;
5966                         padding_len = 0;
5967                 }
5968                 /* generate and add RANDOM parameter */
5969                 randp = (struct sctp_auth_random *)(mtod(m, caddr_t)+chunk_len);
5970                 parameter_len = (uint16_t)sizeof(struct sctp_auth_random) +
5971                     SCTP_AUTH_RANDOM_SIZE_DEFAULT;
5972                 randp->ph.param_type = htons(SCTP_RANDOM);
5973                 randp->ph.param_length = htons(parameter_len);
5974                 SCTP_READ_RANDOM(randp->random_data, SCTP_AUTH_RANDOM_SIZE_DEFAULT);
5975                 padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
5976                 chunk_len += parameter_len;
5977
5978                 if (padding_len > 0) {
5979                         memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
5980                         chunk_len += padding_len;
5981                         padding_len = 0;
5982                 }
5983                 /* add HMAC_ALGO parameter */
5984                 hmacs = (struct sctp_auth_hmac_algo *)(mtod(m, caddr_t)+chunk_len);
5985                 parameter_len = (uint16_t)sizeof(struct sctp_auth_hmac_algo) +
5986                     sctp_serialize_hmaclist(inp->sctp_ep.local_hmacs,
5987                     (uint8_t *)hmacs->hmac_ids);
5988                 hmacs->ph.param_type = htons(SCTP_HMAC_LIST);
5989                 hmacs->ph.param_length = htons(parameter_len);
5990                 padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
5991                 chunk_len += parameter_len;
5992
5993                 if (padding_len > 0) {
5994                         memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
5995                         chunk_len += padding_len;
5996                         padding_len = 0;
5997                 }
5998                 /* add CHUNKS parameter */
5999                 chunks = (struct sctp_auth_chunk_list *)(mtod(m, caddr_t)+chunk_len);
6000                 parameter_len = (uint16_t)sizeof(struct sctp_auth_chunk_list) +
6001                     sctp_serialize_auth_chunks(inp->sctp_ep.local_auth_chunks,
6002                     chunks->chunk_types);
6003                 chunks->ph.param_type = htons(SCTP_CHUNK_LIST);
6004                 chunks->ph.param_length = htons(parameter_len);
6005                 padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
6006                 chunk_len += parameter_len;
6007         }
6008         SCTP_BUF_LEN(m) = chunk_len;
6009         m_last = m;
6010         /* now the addresses */
6011         /*
6012          * To optimize this we could put the scoping stuff into a structure
6013          * and remove the individual uint8's from the stc structure. Then we
6014          * could just sifa in the address within the stc.. but for now this
6015          * is a quick hack to get the address stuff teased apart.
6016          */
6017         scp.ipv4_addr_legal = stc.ipv4_addr_legal;
6018         scp.ipv6_addr_legal = stc.ipv6_addr_legal;
6019         scp.loopback_scope = stc.loopback_scope;
6020         scp.ipv4_local_scope = stc.ipv4_scope;
6021         scp.local_scope = stc.local_scope;
6022         scp.site_scope = stc.site_scope;
6023         m_last = sctp_add_addresses_to_i_ia(inp, stcb, &scp, m_last,
6024             cnt_inits_to,
6025             &padding_len, &chunk_len);
6026         /* padding_len can only be positive, if no addresses have been added */
6027         if (padding_len > 0) {
6028                 memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
6029                 chunk_len += padding_len;
6030                 SCTP_BUF_LEN(m) += padding_len;
6031                 padding_len = 0;
6032         }
6033
6034         /* tack on the operational error if present */
6035         if (op_err) {
6036                 parameter_len = 0;
6037                 for (m_tmp = op_err; m_tmp != NULL; m_tmp = SCTP_BUF_NEXT(m_tmp)) {
6038                         parameter_len += SCTP_BUF_LEN(m_tmp);
6039                 }
6040                 padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
6041                 SCTP_BUF_NEXT(m_last) = op_err;
6042                 while (SCTP_BUF_NEXT(m_last) != NULL) {
6043                         m_last = SCTP_BUF_NEXT(m_last);
6044                 }
6045                 chunk_len += parameter_len;
6046         }
6047         if (padding_len > 0) {
6048                 m_last = sctp_add_pad_tombuf(m_last, padding_len);
6049                 if (m_last == NULL) {
6050                         /* Houston we have a problem, no space */
6051                         sctp_m_freem(m);
6052                         return;
6053                 }
6054                 chunk_len += padding_len;
6055                 padding_len = 0;
6056         }
6057         /* Now we must build a cookie */
6058         m_cookie = sctp_add_cookie(init_pkt, offset, m, 0, &stc, &signature);
6059         if (m_cookie == NULL) {
6060                 /* memory problem */
6061                 sctp_m_freem(m);
6062                 return;
6063         }
6064         /* Now append the cookie to the end and update the space/size */
6065         SCTP_BUF_NEXT(m_last) = m_cookie;
6066         parameter_len = 0;
6067         for (m_tmp = m_cookie; m_tmp != NULL; m_tmp = SCTP_BUF_NEXT(m_tmp)) {
6068                 parameter_len += SCTP_BUF_LEN(m_tmp);
6069                 if (SCTP_BUF_NEXT(m_tmp) == NULL) {
6070                         m_last = m_tmp;
6071                 }
6072         }
6073         padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
6074         chunk_len += parameter_len;
6075
6076         /*
6077          * Place in the size, but we don't include the last pad (if any) in
6078          * the INIT-ACK.
6079          */
6080         initack->ch.chunk_length = htons(chunk_len);
6081
6082         /*
6083          * Time to sign the cookie, we don't sign over the cookie signature
6084          * though thus we set trailer.
6085          */
6086         (void)sctp_hmac_m(SCTP_HMAC,
6087             (uint8_t *)inp->sctp_ep.secret_key[(int)(inp->sctp_ep.current_secret_number)],
6088             SCTP_SECRET_SIZE, m_cookie, sizeof(struct sctp_paramhdr),
6089             (uint8_t *)signature, SCTP_SIGNATURE_SIZE);
6090         /*
6091          * We sifa 0 here to NOT set IP_DF if its IPv4, we ignore the return
6092          * here since the timer will drive a retranmission.
6093          */
6094         if (padding_len > 0) {
6095                 if (sctp_add_pad_tombuf(m_last, padding_len) == NULL) {
6096                         sctp_m_freem(m);
6097                         return;
6098                 }
6099         }
6100         if (stc.loopback_scope) {
6101                 over_addr = (union sctp_sockstore *)dst;
6102         } else {
6103                 over_addr = NULL;
6104         }
6105
6106         if ((error = sctp_lowlevel_chunk_output(inp, NULL, NULL, to, m, 0, NULL, 0, 0,
6107             0, 0,
6108             inp->sctp_lport, sh->src_port, init_chk->init.initiate_tag,
6109             port, over_addr,
6110             mflowtype, mflowid,
6111             SCTP_SO_NOT_LOCKED))) {
6112                 SCTPDBG(SCTP_DEBUG_OUTPUT4, "Gak send error %d\n", error);
6113                 if (error == ENOBUFS) {
6114                         if (asoc != NULL) {
6115                                 asoc->ifp_had_enobuf = 1;
6116                         }
6117                         SCTP_STAT_INCR(sctps_lowlevelerr);
6118                 }
6119         } else {
6120                 if (asoc != NULL) {
6121                         asoc->ifp_had_enobuf = 0;
6122                 }
6123         }
6124         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
6125 }
6126
6127
6128 static void
6129 sctp_prune_prsctp(struct sctp_tcb *stcb,
6130     struct sctp_association *asoc,
6131     struct sctp_sndrcvinfo *srcv,
6132     int dataout)
6133 {
6134         int freed_spc = 0;
6135         struct sctp_tmit_chunk *chk, *nchk;
6136
6137         SCTP_TCB_LOCK_ASSERT(stcb);
6138         if ((asoc->prsctp_supported) &&
6139             (asoc->sent_queue_cnt_removeable > 0)) {
6140                 TAILQ_FOREACH(chk, &asoc->sent_queue, sctp_next) {
6141                         /*
6142                          * Look for chunks marked with the PR_SCTP flag AND
6143                          * the buffer space flag. If the one being sent is
6144                          * equal or greater priority then purge the old one
6145                          * and free some space.
6146                          */
6147                         if (PR_SCTP_BUF_ENABLED(chk->flags)) {
6148                                 /*
6149                                  * This one is PR-SCTP AND buffer space
6150                                  * limited type
6151                                  */
6152                                 if (chk->rec.data.timetodrop.tv_sec > (long)srcv->sinfo_timetolive) {
6153                                         /*
6154                                          * Lower numbers equates to higher
6155                                          * priority. So if the one we are
6156                                          * looking at has a larger priority,
6157                                          * we want to drop the data and NOT
6158                                          * retransmit it.
6159                                          */
6160                                         if (chk->data) {
6161                                                 /*
6162                                                  * We release the book_size
6163                                                  * if the mbuf is here
6164                                                  */
6165                                                 int ret_spc;
6166                                                 uint8_t sent;
6167
6168                                                 if (chk->sent > SCTP_DATAGRAM_UNSENT)
6169                                                         sent = 1;
6170                                                 else
6171                                                         sent = 0;
6172                                                 ret_spc = sctp_release_pr_sctp_chunk(stcb, chk,
6173                                                     sent,
6174                                                     SCTP_SO_LOCKED);
6175                                                 freed_spc += ret_spc;
6176                                                 if (freed_spc >= dataout) {
6177                                                         return;
6178                                                 }
6179                                         }       /* if chunk was present */
6180                                 }       /* if of sufficient priority */
6181                         }       /* if chunk has enabled */
6182                 }               /* tailqforeach */
6183
6184                 TAILQ_FOREACH_SAFE(chk, &asoc->send_queue, sctp_next, nchk) {
6185                         /* Here we must move to the sent queue and mark */
6186                         if (PR_SCTP_BUF_ENABLED(chk->flags)) {
6187                                 if (chk->rec.data.timetodrop.tv_sec > (long)srcv->sinfo_timetolive) {
6188                                         if (chk->data) {
6189                                                 /*
6190                                                  * We release the book_size
6191                                                  * if the mbuf is here
6192                                                  */
6193                                                 int ret_spc;
6194
6195                                                 ret_spc = sctp_release_pr_sctp_chunk(stcb, chk,
6196                                                     0, SCTP_SO_LOCKED);
6197
6198                                                 freed_spc += ret_spc;
6199                                                 if (freed_spc >= dataout) {
6200                                                         return;
6201                                                 }
6202                                         }       /* end if chk->data */
6203                                 }       /* end if right class */
6204                         }       /* end if chk pr-sctp */
6205                 }               /* tailqforeachsafe (chk) */
6206         }                       /* if enabled in asoc */
6207 }
6208
6209 int
6210 sctp_get_frag_point(struct sctp_tcb *stcb,
6211     struct sctp_association *asoc)
6212 {
6213         int siz, ovh;
6214
6215         /*
6216          * For endpoints that have both v6 and v4 addresses we must reserve
6217          * room for the ipv6 header, for those that are only dealing with V4
6218          * we use a larger frag point.
6219          */
6220         if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
6221                 ovh = SCTP_MIN_OVERHEAD;
6222         } else {
6223                 ovh = SCTP_MIN_V4_OVERHEAD;
6224         }
6225         ovh += SCTP_DATA_CHUNK_OVERHEAD(stcb);
6226         if (stcb->asoc.sctp_frag_point > asoc->smallest_mtu)
6227                 siz = asoc->smallest_mtu - ovh;
6228         else
6229                 siz = (stcb->asoc.sctp_frag_point - ovh);
6230         /*
6231          * if (siz > (MCLBYTES-sizeof(struct sctp_data_chunk))) {
6232          */
6233         /* A data chunk MUST fit in a cluster */
6234         /* siz = (MCLBYTES - sizeof(struct sctp_data_chunk)); */
6235         /* } */
6236
6237         /* adjust for an AUTH chunk if DATA requires auth */
6238         if (sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks))
6239                 siz -= sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
6240
6241         if (siz % 4) {
6242                 /* make it an even word boundary please */
6243                 siz -= (siz % 4);
6244         }
6245         return (siz);
6246 }
6247
6248 static void
6249 sctp_set_prsctp_policy(struct sctp_stream_queue_pending *sp)
6250 {
6251         /*
6252          * We assume that the user wants PR_SCTP_TTL if the user provides a
6253          * positive lifetime but does not specify any PR_SCTP policy.
6254          */
6255         if (PR_SCTP_ENABLED(sp->sinfo_flags)) {
6256                 sp->act_flags |= PR_SCTP_POLICY(sp->sinfo_flags);
6257         } else if (sp->timetolive > 0) {
6258                 sp->sinfo_flags |= SCTP_PR_SCTP_TTL;
6259                 sp->act_flags |= PR_SCTP_POLICY(sp->sinfo_flags);
6260         } else {
6261                 return;
6262         }
6263         switch (PR_SCTP_POLICY(sp->sinfo_flags)) {
6264         case CHUNK_FLAGS_PR_SCTP_BUF:
6265                 /*
6266                  * Time to live is a priority stored in tv_sec when doing
6267                  * the buffer drop thing.
6268                  */
6269                 sp->ts.tv_sec = sp->timetolive;
6270                 sp->ts.tv_usec = 0;
6271                 break;
6272         case CHUNK_FLAGS_PR_SCTP_TTL:
6273                 {
6274                         struct timeval tv;
6275
6276                         (void)SCTP_GETTIME_TIMEVAL(&sp->ts);
6277                         tv.tv_sec = sp->timetolive / 1000;
6278                         tv.tv_usec = (sp->timetolive * 1000) % 1000000;
6279                         /*
6280                          * TODO sctp_constants.h needs alternative time
6281                          * macros when _KERNEL is undefined.
6282                          */
6283                         timevaladd(&sp->ts, &tv);
6284                 }
6285                 break;
6286         case CHUNK_FLAGS_PR_SCTP_RTX:
6287                 /*
6288                  * Time to live is a the number or retransmissions stored in
6289                  * tv_sec.
6290                  */
6291                 sp->ts.tv_sec = sp->timetolive;
6292                 sp->ts.tv_usec = 0;
6293                 break;
6294         default:
6295                 SCTPDBG(SCTP_DEBUG_USRREQ1,
6296                     "Unknown PR_SCTP policy %u.\n",
6297                     PR_SCTP_POLICY(sp->sinfo_flags));
6298                 break;
6299         }
6300 }
6301
6302 static int
6303 sctp_msg_append(struct sctp_tcb *stcb,
6304     struct sctp_nets *net,
6305     struct mbuf *m,
6306     struct sctp_sndrcvinfo *srcv, int hold_stcb_lock)
6307 {
6308         int error = 0;
6309         struct mbuf *at;
6310         struct sctp_stream_queue_pending *sp = NULL;
6311         struct sctp_stream_out *strm;
6312
6313         /*
6314          * Given an mbuf chain, put it into the association send queue and
6315          * place it on the wheel
6316          */
6317         if (srcv->sinfo_stream >= stcb->asoc.streamoutcnt) {
6318                 /* Invalid stream number */
6319                 SCTP_LTRACE_ERR_RET_PKT(m, NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
6320                 error = EINVAL;
6321                 goto out_now;
6322         }
6323         if ((stcb->asoc.stream_locked) &&
6324             (stcb->asoc.stream_locked_on != srcv->sinfo_stream)) {
6325                 SCTP_LTRACE_ERR_RET_PKT(m, NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
6326                 error = EINVAL;
6327                 goto out_now;
6328         }
6329         strm = &stcb->asoc.strmout[srcv->sinfo_stream];
6330         /* Now can we send this? */
6331         if ((SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_SENT) ||
6332             (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_ACK_SENT) ||
6333             (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_RECEIVED) ||
6334             (stcb->asoc.state & SCTP_STATE_SHUTDOWN_PENDING)) {
6335                 /* got data while shutting down */
6336                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
6337                 error = ECONNRESET;
6338                 goto out_now;
6339         }
6340         sctp_alloc_a_strmoq(stcb, sp);
6341         if (sp == NULL) {
6342                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
6343                 error = ENOMEM;
6344                 goto out_now;
6345         }
6346         sp->sinfo_flags = srcv->sinfo_flags;
6347         sp->timetolive = srcv->sinfo_timetolive;
6348         sp->ppid = srcv->sinfo_ppid;
6349         sp->context = srcv->sinfo_context;
6350         sp->fsn = 0;
6351         if (sp->sinfo_flags & SCTP_ADDR_OVER) {
6352                 sp->net = net;
6353                 atomic_add_int(&sp->net->ref_count, 1);
6354         } else {
6355                 sp->net = NULL;
6356         }
6357         (void)SCTP_GETTIME_TIMEVAL(&sp->ts);
6358         sp->sid = srcv->sinfo_stream;
6359         sp->msg_is_complete = 1;
6360         sp->sender_all_done = 1;
6361         sp->some_taken = 0;
6362         sp->data = m;
6363         sp->tail_mbuf = NULL;
6364         sctp_set_prsctp_policy(sp);
6365         /*
6366          * We could in theory (for sendall) sifa the length in, but we would
6367          * still have to hunt through the chain since we need to setup the
6368          * tail_mbuf
6369          */
6370         sp->length = 0;
6371         for (at = m; at; at = SCTP_BUF_NEXT(at)) {
6372                 if (SCTP_BUF_NEXT(at) == NULL)
6373                         sp->tail_mbuf = at;
6374                 sp->length += SCTP_BUF_LEN(at);
6375         }
6376         if (srcv->sinfo_keynumber_valid) {
6377                 sp->auth_keyid = srcv->sinfo_keynumber;
6378         } else {
6379                 sp->auth_keyid = stcb->asoc.authinfo.active_keyid;
6380         }
6381         if (sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks)) {
6382                 sctp_auth_key_acquire(stcb, sp->auth_keyid);
6383                 sp->holds_key_ref = 1;
6384         }
6385         if (hold_stcb_lock == 0) {
6386                 SCTP_TCB_SEND_LOCK(stcb);
6387         }
6388         sctp_snd_sb_alloc(stcb, sp->length);
6389         atomic_add_int(&stcb->asoc.stream_queue_cnt, 1);
6390         TAILQ_INSERT_TAIL(&strm->outqueue, sp, next);
6391         stcb->asoc.ss_functions.sctp_ss_add_to_stream(stcb, &stcb->asoc, strm, sp, 1);
6392         m = NULL;
6393         if (hold_stcb_lock == 0) {
6394                 SCTP_TCB_SEND_UNLOCK(stcb);
6395         }
6396 out_now:
6397         if (m) {
6398                 sctp_m_freem(m);
6399         }
6400         return (error);
6401 }
6402
6403
6404 static struct mbuf *
6405 sctp_copy_mbufchain(struct mbuf *clonechain,
6406     struct mbuf *outchain,
6407     struct mbuf **endofchain,
6408     int can_take_mbuf,
6409     int sizeofcpy,
6410     uint8_t copy_by_ref)
6411 {
6412         struct mbuf *m;
6413         struct mbuf *appendchain;
6414         caddr_t cp;
6415         int len;
6416
6417         if (endofchain == NULL) {
6418                 /* error */
6419 error_out:
6420                 if (outchain)
6421                         sctp_m_freem(outchain);
6422                 return (NULL);
6423         }
6424         if (can_take_mbuf) {
6425                 appendchain = clonechain;
6426         } else {
6427                 if (!copy_by_ref &&
6428                     (sizeofcpy <= (int)((((SCTP_BASE_SYSCTL(sctp_mbuf_threshold_count) - 1) * MLEN) + MHLEN)))) {
6429                         /* Its not in a cluster */
6430                         if (*endofchain == NULL) {
6431                                 /* lets get a mbuf cluster */
6432                                 if (outchain == NULL) {
6433                                         /* This is the general case */
6434                         new_mbuf:
6435                                         outchain = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_HEADER);
6436                                         if (outchain == NULL) {
6437                                                 goto error_out;
6438                                         }
6439                                         SCTP_BUF_LEN(outchain) = 0;
6440                                         *endofchain = outchain;
6441                                         /* get the prepend space */
6442                                         SCTP_BUF_RESV_UF(outchain, (SCTP_FIRST_MBUF_RESV + 4));
6443                                 } else {
6444                                         /*
6445                                          * We really should not get a NULL
6446                                          * in endofchain
6447                                          */
6448                                         /* find end */
6449                                         m = outchain;
6450                                         while (m) {
6451                                                 if (SCTP_BUF_NEXT(m) == NULL) {
6452                                                         *endofchain = m;
6453                                                         break;
6454                                                 }
6455                                                 m = SCTP_BUF_NEXT(m);
6456                                         }
6457                                         /* sanity */
6458                                         if (*endofchain == NULL) {
6459                                                 /*
6460                                                  * huh, TSNH XXX maybe we
6461                                                  * should panic
6462                                                  */
6463                                                 sctp_m_freem(outchain);
6464                                                 goto new_mbuf;
6465                                         }
6466                                 }
6467                                 /* get the new end of length */
6468                                 len = (int)M_TRAILINGSPACE(*endofchain);
6469                         } else {
6470                                 /* how much is left at the end? */
6471                                 len = (int)M_TRAILINGSPACE(*endofchain);
6472                         }
6473                         /* Find the end of the data, for appending */
6474                         cp = (mtod((*endofchain), caddr_t)+SCTP_BUF_LEN((*endofchain)));
6475
6476                         /* Now lets copy it out */
6477                         if (len >= sizeofcpy) {
6478                                 /* It all fits, copy it in */
6479                                 m_copydata(clonechain, 0, sizeofcpy, cp);
6480                                 SCTP_BUF_LEN((*endofchain)) += sizeofcpy;
6481                         } else {
6482                                 /* fill up the end of the chain */
6483                                 if (len > 0) {
6484                                         m_copydata(clonechain, 0, len, cp);
6485                                         SCTP_BUF_LEN((*endofchain)) += len;
6486                                         /* now we need another one */
6487                                         sizeofcpy -= len;
6488                                 }
6489                                 m = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_HEADER);
6490                                 if (m == NULL) {
6491                                         /* We failed */
6492                                         goto error_out;
6493                                 }
6494                                 SCTP_BUF_NEXT((*endofchain)) = m;
6495                                 *endofchain = m;
6496                                 cp = mtod((*endofchain), caddr_t);
6497                                 m_copydata(clonechain, len, sizeofcpy, cp);
6498                                 SCTP_BUF_LEN((*endofchain)) += sizeofcpy;
6499                         }
6500                         return (outchain);
6501                 } else {
6502                         /* copy the old fashion way */
6503                         appendchain = SCTP_M_COPYM(clonechain, 0, M_COPYALL, M_NOWAIT);
6504 #ifdef SCTP_MBUF_LOGGING
6505                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
6506                                 sctp_log_mbc(appendchain, SCTP_MBUF_ICOPY);
6507                         }
6508 #endif
6509                 }
6510         }
6511         if (appendchain == NULL) {
6512                 /* error */
6513                 if (outchain)
6514                         sctp_m_freem(outchain);
6515                 return (NULL);
6516         }
6517         if (outchain) {
6518                 /* tack on to the end */
6519                 if (*endofchain != NULL) {
6520                         SCTP_BUF_NEXT(((*endofchain))) = appendchain;
6521                 } else {
6522                         m = outchain;
6523                         while (m) {
6524                                 if (SCTP_BUF_NEXT(m) == NULL) {
6525                                         SCTP_BUF_NEXT(m) = appendchain;
6526                                         break;
6527                                 }
6528                                 m = SCTP_BUF_NEXT(m);
6529                         }
6530                 }
6531                 /*
6532                  * save off the end and update the end-chain position
6533                  */
6534                 m = appendchain;
6535                 while (m) {
6536                         if (SCTP_BUF_NEXT(m) == NULL) {
6537                                 *endofchain = m;
6538                                 break;
6539                         }
6540                         m = SCTP_BUF_NEXT(m);
6541                 }
6542                 return (outchain);
6543         } else {
6544                 /* save off the end and update the end-chain position */
6545                 m = appendchain;
6546                 while (m) {
6547                         if (SCTP_BUF_NEXT(m) == NULL) {
6548                                 *endofchain = m;
6549                                 break;
6550                         }
6551                         m = SCTP_BUF_NEXT(m);
6552                 }
6553                 return (appendchain);
6554         }
6555 }
6556
6557 static int
6558 sctp_med_chunk_output(struct sctp_inpcb *inp,
6559     struct sctp_tcb *stcb,
6560     struct sctp_association *asoc,
6561     int *num_out,
6562     int *reason_code,
6563     int control_only, int from_where,
6564     struct timeval *now, int *now_filled, int frag_point, int so_locked);
6565
6566 static void
6567 sctp_sendall_iterator(struct sctp_inpcb *inp, struct sctp_tcb *stcb, void *ptr,
6568     uint32_t val SCTP_UNUSED)
6569 {
6570         struct sctp_copy_all *ca;
6571         struct mbuf *m;
6572         int ret = 0;
6573         int added_control = 0;
6574         int un_sent, do_chunk_output = 1;
6575         struct sctp_association *asoc;
6576         struct sctp_nets *net;
6577
6578         ca = (struct sctp_copy_all *)ptr;
6579         if (ca->m == NULL) {
6580                 return;
6581         }
6582         if (ca->inp != inp) {
6583                 /* TSNH */
6584                 return;
6585         }
6586         if (ca->sndlen > 0) {
6587                 m = SCTP_M_COPYM(ca->m, 0, M_COPYALL, M_NOWAIT);
6588                 if (m == NULL) {
6589                         /* can't copy so we are done */
6590                         ca->cnt_failed++;
6591                         return;
6592                 }
6593 #ifdef SCTP_MBUF_LOGGING
6594                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
6595                         sctp_log_mbc(m, SCTP_MBUF_ICOPY);
6596                 }
6597 #endif
6598         } else {
6599                 m = NULL;
6600         }
6601         SCTP_TCB_LOCK_ASSERT(stcb);
6602         if (stcb->asoc.alternate) {
6603                 net = stcb->asoc.alternate;
6604         } else {
6605                 net = stcb->asoc.primary_destination;
6606         }
6607         if (ca->sndrcv.sinfo_flags & SCTP_ABORT) {
6608                 /* Abort this assoc with m as the user defined reason */
6609                 if (m != NULL) {
6610                         SCTP_BUF_PREPEND(m, sizeof(struct sctp_paramhdr), M_NOWAIT);
6611                 } else {
6612                         m = sctp_get_mbuf_for_msg(sizeof(struct sctp_paramhdr),
6613                             0, M_NOWAIT, 1, MT_DATA);
6614                         SCTP_BUF_LEN(m) = sizeof(struct sctp_paramhdr);
6615                 }
6616                 if (m != NULL) {
6617                         struct sctp_paramhdr *ph;
6618
6619                         ph = mtod(m, struct sctp_paramhdr *);
6620                         ph->param_type = htons(SCTP_CAUSE_USER_INITIATED_ABT);
6621                         ph->param_length = htons((uint16_t)(sizeof(struct sctp_paramhdr) + ca->sndlen));
6622                 }
6623                 /*
6624                  * We add one here to keep the assoc from dis-appearing on
6625                  * us.
6626                  */
6627                 atomic_add_int(&stcb->asoc.refcnt, 1);
6628                 sctp_abort_an_association(inp, stcb, m, SCTP_SO_NOT_LOCKED);
6629                 /*
6630                  * sctp_abort_an_association calls sctp_free_asoc() free
6631                  * association will NOT free it since we incremented the
6632                  * refcnt .. we do this to prevent it being freed and things
6633                  * getting tricky since we could end up (from free_asoc)
6634                  * calling inpcb_free which would get a recursive lock call
6635                  * to the iterator lock.. But as a consequence of that the
6636                  * stcb will return to us un-locked.. since free_asoc
6637                  * returns with either no TCB or the TCB unlocked, we must
6638                  * relock.. to unlock in the iterator timer :-0
6639                  */
6640                 SCTP_TCB_LOCK(stcb);
6641                 atomic_add_int(&stcb->asoc.refcnt, -1);
6642                 goto no_chunk_output;
6643         } else {
6644                 if (m) {
6645                         ret = sctp_msg_append(stcb, net, m,
6646                             &ca->sndrcv, 1);
6647                 }
6648                 asoc = &stcb->asoc;
6649                 if (ca->sndrcv.sinfo_flags & SCTP_EOF) {
6650                         /* shutdown this assoc */
6651                         if (TAILQ_EMPTY(&asoc->send_queue) &&
6652                             TAILQ_EMPTY(&asoc->sent_queue) &&
6653                             sctp_is_there_unsent_data(stcb, SCTP_SO_NOT_LOCKED) == 0) {
6654                                 if ((*asoc->ss_functions.sctp_ss_is_user_msgs_incomplete) (stcb, asoc)) {
6655                                         goto abort_anyway;
6656                                 }
6657                                 /*
6658                                  * there is nothing queued to send, so I'm
6659                                  * done...
6660                                  */
6661                                 if ((SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_SENT) &&
6662                                     (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
6663                                     (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
6664                                         /*
6665                                          * only send SHUTDOWN the first time
6666                                          * through
6667                                          */
6668                                         if (SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) {
6669                                                 SCTP_STAT_DECR_GAUGE32(sctps_currestab);
6670                                         }
6671                                         SCTP_SET_STATE(stcb, SCTP_STATE_SHUTDOWN_SENT);
6672                                         sctp_stop_timers_for_shutdown(stcb);
6673                                         sctp_send_shutdown(stcb, net);
6674                                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb,
6675                                             net);
6676                                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
6677                                             NULL);
6678                                         added_control = 1;
6679                                         do_chunk_output = 0;
6680                                 }
6681                         } else {
6682                                 /*
6683                                  * we still got (or just got) data to send,
6684                                  * so set SHUTDOWN_PENDING
6685                                  */
6686                                 /*
6687                                  * XXX sockets draft says that SCTP_EOF
6688                                  * should be sent with no data.  currently,
6689                                  * we will allow user data to be sent first
6690                                  * and move to SHUTDOWN-PENDING
6691                                  */
6692                                 if ((SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_SENT) &&
6693                                     (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
6694                                     (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
6695                                         if ((*asoc->ss_functions.sctp_ss_is_user_msgs_incomplete) (stcb, asoc)) {
6696                                                 SCTP_ADD_SUBSTATE(stcb, SCTP_STATE_PARTIAL_MSG_LEFT);
6697                                         }
6698                                         SCTP_ADD_SUBSTATE(stcb, SCTP_STATE_SHUTDOWN_PENDING);
6699                                         if (TAILQ_EMPTY(&asoc->send_queue) &&
6700                                             TAILQ_EMPTY(&asoc->sent_queue) &&
6701                                             (asoc->state & SCTP_STATE_PARTIAL_MSG_LEFT)) {
6702                                                 struct mbuf *op_err;
6703                                                 char msg[SCTP_DIAG_INFO_LEN];
6704
6705                                 abort_anyway:
6706                                                 SCTP_SNPRINTF(msg, sizeof(msg),
6707                                                     "%s:%d at %s", __FILE__, __LINE__, __func__);
6708                                                 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
6709                                                     msg);
6710                                                 atomic_add_int(&stcb->asoc.refcnt, 1);
6711                                                 sctp_abort_an_association(stcb->sctp_ep, stcb,
6712                                                     op_err, SCTP_SO_NOT_LOCKED);
6713                                                 atomic_add_int(&stcb->asoc.refcnt, -1);
6714                                                 goto no_chunk_output;
6715                                         }
6716                                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
6717                                             NULL);
6718                                 }
6719                         }
6720
6721                 }
6722         }
6723         un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
6724             (stcb->asoc.stream_queue_cnt * SCTP_DATA_CHUNK_OVERHEAD(stcb)));
6725
6726         if ((sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY)) &&
6727             (stcb->asoc.total_flight > 0) &&
6728             (un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD))) {
6729                 do_chunk_output = 0;
6730         }
6731         if (do_chunk_output)
6732                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_NOT_LOCKED);
6733         else if (added_control) {
6734                 int num_out, reason, now_filled = 0;
6735                 struct timeval now;
6736                 int frag_point;
6737
6738                 frag_point = sctp_get_frag_point(stcb, &stcb->asoc);
6739                 (void)sctp_med_chunk_output(inp, stcb, &stcb->asoc, &num_out,
6740                     &reason, 1, 1, &now, &now_filled, frag_point, SCTP_SO_NOT_LOCKED);
6741         }
6742 no_chunk_output:
6743         if (ret) {
6744                 ca->cnt_failed++;
6745         } else {
6746                 ca->cnt_sent++;
6747         }
6748 }
6749
6750 static void
6751 sctp_sendall_completes(void *ptr, uint32_t val SCTP_UNUSED)
6752 {
6753         struct sctp_copy_all *ca;
6754
6755         ca = (struct sctp_copy_all *)ptr;
6756         /*
6757          * Do a notify here? Kacheong suggests that the notify be done at
6758          * the send time.. so you would push up a notification if any send
6759          * failed. Don't know if this is feasible since the only failures we
6760          * have is "memory" related and if you cannot get an mbuf to send
6761          * the data you surely can't get an mbuf to send up to notify the
6762          * user you can't send the data :->
6763          */
6764
6765         /* now free everything */
6766         if (ca->inp) {
6767                 /* Lets clear the flag to allow others to run. */
6768                 ca->inp->sctp_flags &= ~SCTP_PCB_FLAGS_SND_ITERATOR_UP;
6769         }
6770         sctp_m_freem(ca->m);
6771         SCTP_FREE(ca, SCTP_M_COPYAL);
6772 }
6773
6774 static struct mbuf *
6775 sctp_copy_out_all(struct uio *uio, ssize_t len)
6776 {
6777         struct mbuf *ret, *at;
6778         ssize_t left, willcpy, cancpy, error;
6779
6780         ret = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_WAITOK, 1, MT_DATA);
6781         if (ret == NULL) {
6782                 /* TSNH */
6783                 return (NULL);
6784         }
6785         left = len;
6786         SCTP_BUF_LEN(ret) = 0;
6787         /* save space for the data chunk header */
6788         cancpy = (int)M_TRAILINGSPACE(ret);
6789         willcpy = min(cancpy, left);
6790         at = ret;
6791         while (left > 0) {
6792                 /* Align data to the end */
6793                 error = uiomove(mtod(at, caddr_t), (int)willcpy, uio);
6794                 if (error) {
6795         err_out_now:
6796                         sctp_m_freem(at);
6797                         return (NULL);
6798                 }
6799                 SCTP_BUF_LEN(at) = (int)willcpy;
6800                 SCTP_BUF_NEXT_PKT(at) = SCTP_BUF_NEXT(at) = 0;
6801                 left -= willcpy;
6802                 if (left > 0) {
6803                         SCTP_BUF_NEXT(at) = sctp_get_mbuf_for_msg((unsigned int)left, 0, M_WAITOK, 1, MT_DATA);
6804                         if (SCTP_BUF_NEXT(at) == NULL) {
6805                                 goto err_out_now;
6806                         }
6807                         at = SCTP_BUF_NEXT(at);
6808                         SCTP_BUF_LEN(at) = 0;
6809                         cancpy = (int)M_TRAILINGSPACE(at);
6810                         willcpy = min(cancpy, left);
6811                 }
6812         }
6813         return (ret);
6814 }
6815
6816 static int
6817 sctp_sendall(struct sctp_inpcb *inp, struct uio *uio, struct mbuf *m,
6818     struct sctp_sndrcvinfo *srcv)
6819 {
6820         int ret;
6821         struct sctp_copy_all *ca;
6822
6823         if (inp->sctp_flags & SCTP_PCB_FLAGS_SND_ITERATOR_UP) {
6824                 /* There is another. */
6825                 return (EBUSY);
6826         }
6827         if (uio->uio_resid > (ssize_t)SCTP_BASE_SYSCTL(sctp_sendall_limit)) {
6828                 /* You must not be larger than the limit! */
6829                 return (EMSGSIZE);
6830         }
6831         SCTP_MALLOC(ca, struct sctp_copy_all *, sizeof(struct sctp_copy_all),
6832             SCTP_M_COPYAL);
6833         if (ca == NULL) {
6834                 sctp_m_freem(m);
6835                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
6836                 return (ENOMEM);
6837         }
6838         memset(ca, 0, sizeof(struct sctp_copy_all));
6839
6840         ca->inp = inp;
6841         if (srcv) {
6842                 memcpy(&ca->sndrcv, srcv, sizeof(struct sctp_nonpad_sndrcvinfo));
6843         }
6844         /*
6845          * take off the sendall flag, it would be bad if we failed to do
6846          * this :-0
6847          */
6848         ca->sndrcv.sinfo_flags &= ~SCTP_SENDALL;
6849         /* get length and mbuf chain */
6850         if (uio) {
6851                 ca->sndlen = uio->uio_resid;
6852                 ca->m = sctp_copy_out_all(uio, ca->sndlen);
6853                 if (ca->m == NULL) {
6854                         SCTP_FREE(ca, SCTP_M_COPYAL);
6855                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
6856                         return (ENOMEM);
6857                 }
6858         } else {
6859                 /* Gather the length of the send */
6860                 struct mbuf *mat;
6861
6862                 ca->sndlen = 0;
6863                 for (mat = m; mat; mat = SCTP_BUF_NEXT(mat)) {
6864                         ca->sndlen += SCTP_BUF_LEN(mat);
6865                 }
6866         }
6867         inp->sctp_flags |= SCTP_PCB_FLAGS_SND_ITERATOR_UP;
6868         ret = sctp_initiate_iterator(NULL, sctp_sendall_iterator, NULL,
6869             SCTP_PCB_ANY_FLAGS, SCTP_PCB_ANY_FEATURES,
6870             SCTP_ASOC_ANY_STATE,
6871             (void *)ca, 0,
6872             sctp_sendall_completes, inp, 1);
6873         if (ret) {
6874                 inp->sctp_flags &= ~SCTP_PCB_FLAGS_SND_ITERATOR_UP;
6875                 SCTP_FREE(ca, SCTP_M_COPYAL);
6876                 SCTP_LTRACE_ERR_RET_PKT(m, inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EFAULT);
6877                 return (EFAULT);
6878         }
6879         return (0);
6880 }
6881
6882
6883 void
6884 sctp_toss_old_cookies(struct sctp_tcb *stcb, struct sctp_association *asoc)
6885 {
6886         struct sctp_tmit_chunk *chk, *nchk;
6887
6888         TAILQ_FOREACH_SAFE(chk, &asoc->control_send_queue, sctp_next, nchk) {
6889                 if (chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
6890                         TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
6891                         asoc->ctrl_queue_cnt--;
6892                         if (chk->data) {
6893                                 sctp_m_freem(chk->data);
6894                                 chk->data = NULL;
6895                         }
6896                         sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
6897                 }
6898         }
6899 }
6900
6901 void
6902 sctp_toss_old_asconf(struct sctp_tcb *stcb)
6903 {
6904         struct sctp_association *asoc;
6905         struct sctp_tmit_chunk *chk, *nchk;
6906         struct sctp_asconf_chunk *acp;
6907
6908         asoc = &stcb->asoc;
6909         TAILQ_FOREACH_SAFE(chk, &asoc->asconf_send_queue, sctp_next, nchk) {
6910                 /* find SCTP_ASCONF chunk in queue */
6911                 if (chk->rec.chunk_id.id == SCTP_ASCONF) {
6912                         if (chk->data) {
6913                                 acp = mtod(chk->data, struct sctp_asconf_chunk *);
6914                                 if (SCTP_TSN_GT(ntohl(acp->serial_number), asoc->asconf_seq_out_acked)) {
6915                                         /* Not Acked yet */
6916                                         break;
6917                                 }
6918                         }
6919                         TAILQ_REMOVE(&asoc->asconf_send_queue, chk, sctp_next);
6920                         asoc->ctrl_queue_cnt--;
6921                         if (chk->data) {
6922                                 sctp_m_freem(chk->data);
6923                                 chk->data = NULL;
6924                         }
6925                         sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
6926                 }
6927         }
6928 }
6929
6930
6931 static void
6932 sctp_clean_up_datalist(struct sctp_tcb *stcb,
6933     struct sctp_association *asoc,
6934     struct sctp_tmit_chunk **data_list,
6935     int bundle_at,
6936     struct sctp_nets *net)
6937 {
6938         int i;
6939         struct sctp_tmit_chunk *tp1;
6940
6941         for (i = 0; i < bundle_at; i++) {
6942                 /* off of the send queue */
6943                 TAILQ_REMOVE(&asoc->send_queue, data_list[i], sctp_next);
6944                 asoc->send_queue_cnt--;
6945                 if (i > 0) {
6946                         /*
6947                          * Any chunk NOT 0 you zap the time chunk 0 gets
6948                          * zapped or set based on if a RTO measurment is
6949                          * needed.
6950                          */
6951                         data_list[i]->do_rtt = 0;
6952                 }
6953                 /* record time */
6954                 data_list[i]->sent_rcv_time = net->last_sent_time;
6955                 data_list[i]->rec.data.cwnd_at_send = net->cwnd;
6956                 data_list[i]->rec.data.fast_retran_tsn = data_list[i]->rec.data.tsn;
6957                 if (data_list[i]->whoTo == NULL) {
6958                         data_list[i]->whoTo = net;
6959                         atomic_add_int(&net->ref_count, 1);
6960                 }
6961                 /* on to the sent queue */
6962                 tp1 = TAILQ_LAST(&asoc->sent_queue, sctpchunk_listhead);
6963                 if ((tp1) && SCTP_TSN_GT(tp1->rec.data.tsn, data_list[i]->rec.data.tsn)) {
6964                         struct sctp_tmit_chunk *tpp;
6965
6966                         /* need to move back */
6967         back_up_more:
6968                         tpp = TAILQ_PREV(tp1, sctpchunk_listhead, sctp_next);
6969                         if (tpp == NULL) {
6970                                 TAILQ_INSERT_BEFORE(tp1, data_list[i], sctp_next);
6971                                 goto all_done;
6972                         }
6973                         tp1 = tpp;
6974                         if (SCTP_TSN_GT(tp1->rec.data.tsn, data_list[i]->rec.data.tsn)) {
6975                                 goto back_up_more;
6976                         }
6977                         TAILQ_INSERT_AFTER(&asoc->sent_queue, tp1, data_list[i], sctp_next);
6978                 } else {
6979                         TAILQ_INSERT_TAIL(&asoc->sent_queue,
6980                             data_list[i],
6981                             sctp_next);
6982                 }
6983 all_done:
6984                 /* This does not lower until the cum-ack passes it */
6985                 asoc->sent_queue_cnt++;
6986                 if ((asoc->peers_rwnd <= 0) &&
6987                     (asoc->total_flight == 0) &&
6988                     (bundle_at == 1)) {
6989                         /* Mark the chunk as being a window probe */
6990                         SCTP_STAT_INCR(sctps_windowprobed);
6991                 }
6992 #ifdef SCTP_AUDITING_ENABLED
6993                 sctp_audit_log(0xC2, 3);
6994 #endif
6995                 data_list[i]->sent = SCTP_DATAGRAM_SENT;
6996                 data_list[i]->snd_count = 1;
6997                 data_list[i]->rec.data.chunk_was_revoked = 0;
6998                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
6999                         sctp_misc_ints(SCTP_FLIGHT_LOG_UP,
7000                             data_list[i]->whoTo->flight_size,
7001                             data_list[i]->book_size,
7002                             (uint32_t)(uintptr_t)data_list[i]->whoTo,
7003                             data_list[i]->rec.data.tsn);
7004                 }
7005                 sctp_flight_size_increase(data_list[i]);
7006                 sctp_total_flight_increase(stcb, data_list[i]);
7007                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_RWND_ENABLE) {
7008                         sctp_log_rwnd(SCTP_DECREASE_PEER_RWND,
7009                             asoc->peers_rwnd, data_list[i]->send_size, SCTP_BASE_SYSCTL(sctp_peer_chunk_oh));
7010                 }
7011                 asoc->peers_rwnd = sctp_sbspace_sub(asoc->peers_rwnd,
7012                     (uint32_t)(data_list[i]->send_size + SCTP_BASE_SYSCTL(sctp_peer_chunk_oh)));
7013                 if (asoc->peers_rwnd < stcb->sctp_ep->sctp_ep.sctp_sws_sender) {
7014                         /* SWS sender side engages */
7015                         asoc->peers_rwnd = 0;
7016                 }
7017         }
7018         if (asoc->cc_functions.sctp_cwnd_update_packet_transmitted) {
7019                 (*asoc->cc_functions.sctp_cwnd_update_packet_transmitted) (stcb, net);
7020         }
7021 }
7022
7023 static void
7024 sctp_clean_up_ctl(struct sctp_tcb *stcb, struct sctp_association *asoc, int so_locked)
7025 {
7026         struct sctp_tmit_chunk *chk, *nchk;
7027
7028         TAILQ_FOREACH_SAFE(chk, &asoc->control_send_queue, sctp_next, nchk) {
7029                 if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
7030                     (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK) ||  /* EY */
7031                     (chk->rec.chunk_id.id == SCTP_HEARTBEAT_REQUEST) ||
7032                     (chk->rec.chunk_id.id == SCTP_HEARTBEAT_ACK) ||
7033                     (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN) ||
7034                     (chk->rec.chunk_id.id == SCTP_SHUTDOWN) ||
7035                     (chk->rec.chunk_id.id == SCTP_SHUTDOWN_ACK) ||
7036                     (chk->rec.chunk_id.id == SCTP_OPERATION_ERROR) ||
7037                     (chk->rec.chunk_id.id == SCTP_PACKET_DROPPED) ||
7038                     (chk->rec.chunk_id.id == SCTP_COOKIE_ACK) ||
7039                     (chk->rec.chunk_id.id == SCTP_ECN_CWR) ||
7040                     (chk->rec.chunk_id.id == SCTP_ASCONF_ACK)) {
7041                         /* Stray chunks must be cleaned up */
7042         clean_up_anyway:
7043                         TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
7044                         asoc->ctrl_queue_cnt--;
7045                         if (chk->data) {
7046                                 sctp_m_freem(chk->data);
7047                                 chk->data = NULL;
7048                         }
7049                         if (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN) {
7050                                 asoc->fwd_tsn_cnt--;
7051                         }
7052                         sctp_free_a_chunk(stcb, chk, so_locked);
7053                 } else if (chk->rec.chunk_id.id == SCTP_STREAM_RESET) {
7054                         /* special handling, we must look into the param */
7055                         if (chk != asoc->str_reset) {
7056                                 goto clean_up_anyway;
7057                         }
7058                 }
7059         }
7060 }
7061
7062 static uint32_t
7063 sctp_can_we_split_this(struct sctp_tcb *stcb, uint32_t length,
7064     uint32_t space_left, uint32_t frag_point, int eeor_on)
7065 {
7066         /*
7067          * Make a decision on if I should split a msg into multiple parts.
7068          * This is only asked of incomplete messages.
7069          */
7070         if (eeor_on) {
7071                 /*
7072                  * If we are doing EEOR we need to always send it if its the
7073                  * entire thing, since it might be all the guy is putting in
7074                  * the hopper.
7075                  */
7076                 if (space_left >= length) {
7077                         /*-
7078                          * If we have data outstanding,
7079                          * we get another chance when the sack
7080                          * arrives to transmit - wait for more data
7081                          */
7082                         if (stcb->asoc.total_flight == 0) {
7083                                 /*
7084                                  * If nothing is in flight, we zero the
7085                                  * packet counter.
7086                                  */
7087                                 return (length);
7088                         }
7089                         return (0);
7090
7091                 } else {
7092                         /* You can fill the rest */
7093                         return (space_left);
7094                 }
7095         }
7096         /*-
7097          * For those strange folk that make the send buffer
7098          * smaller than our fragmentation point, we can't
7099          * get a full msg in so we have to allow splitting.
7100          */
7101         if (SCTP_SB_LIMIT_SND(stcb->sctp_socket) < frag_point) {
7102                 return (length);
7103         }
7104         if ((length <= space_left) ||
7105             ((length - space_left) < SCTP_BASE_SYSCTL(sctp_min_residual))) {
7106                 /* Sub-optimial residual don't split in non-eeor mode. */
7107                 return (0);
7108         }
7109         /*
7110          * If we reach here length is larger than the space_left. Do we wish
7111          * to split it for the sake of packet putting together?
7112          */
7113         if (space_left >= min(SCTP_BASE_SYSCTL(sctp_min_split_point), frag_point)) {
7114                 /* Its ok to split it */
7115                 return (min(space_left, frag_point));
7116         }
7117         /* Nope, can't split */
7118         return (0);
7119 }
7120
7121 static uint32_t
7122 sctp_move_to_outqueue(struct sctp_tcb *stcb,
7123     struct sctp_stream_out *strq,
7124     uint32_t space_left,
7125     uint32_t frag_point,
7126     int *giveup,
7127     int eeor_mode,
7128     int *bail,
7129     int so_locked)
7130 {
7131         /* Move from the stream to the send_queue keeping track of the total */
7132         struct sctp_association *asoc;
7133         struct sctp_stream_queue_pending *sp;
7134         struct sctp_tmit_chunk *chk;
7135         struct sctp_data_chunk *dchkh = NULL;
7136         struct sctp_idata_chunk *ndchkh = NULL;
7137         uint32_t to_move, length;
7138         int leading;
7139         uint8_t rcv_flags = 0;
7140         uint8_t some_taken;
7141         uint8_t send_lock_up = 0;
7142
7143         SCTP_TCB_LOCK_ASSERT(stcb);
7144         asoc = &stcb->asoc;
7145 one_more_time:
7146         /* sa_ignore FREED_MEMORY */
7147         sp = TAILQ_FIRST(&strq->outqueue);
7148         if (sp == NULL) {
7149                 if (send_lock_up == 0) {
7150                         SCTP_TCB_SEND_LOCK(stcb);
7151                         send_lock_up = 1;
7152                 }
7153                 sp = TAILQ_FIRST(&strq->outqueue);
7154                 if (sp) {
7155                         goto one_more_time;
7156                 }
7157                 if ((sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_EXPLICIT_EOR) == 0) &&
7158                     (stcb->asoc.idata_supported == 0) &&
7159                     (strq->last_msg_incomplete)) {
7160                         SCTP_PRINTF("Huh? Stream:%d lm_in_c=%d but queue is NULL\n",
7161                             strq->sid,
7162                             strq->last_msg_incomplete);
7163                         strq->last_msg_incomplete = 0;
7164                 }
7165                 to_move = 0;
7166                 if (send_lock_up) {
7167                         SCTP_TCB_SEND_UNLOCK(stcb);
7168                         send_lock_up = 0;
7169                 }
7170                 goto out_of;
7171         }
7172         if ((sp->msg_is_complete) && (sp->length == 0)) {
7173                 if (sp->sender_all_done) {
7174                         /*
7175                          * We are doing deferred cleanup. Last time through
7176                          * when we took all the data the sender_all_done was
7177                          * not set.
7178                          */
7179                         if ((sp->put_last_out == 0) && (sp->discard_rest == 0)) {
7180                                 SCTP_PRINTF("Gak, put out entire msg with NO end!-1\n");
7181                                 SCTP_PRINTF("sender_done:%d len:%d msg_comp:%d put_last_out:%d send_lock:%d\n",
7182                                     sp->sender_all_done,
7183                                     sp->length,
7184                                     sp->msg_is_complete,
7185                                     sp->put_last_out,
7186                                     send_lock_up);
7187                         }
7188                         if ((TAILQ_NEXT(sp, next) == NULL) && (send_lock_up == 0)) {
7189                                 SCTP_TCB_SEND_LOCK(stcb);
7190                                 send_lock_up = 1;
7191                         }
7192                         atomic_subtract_int(&asoc->stream_queue_cnt, 1);
7193                         TAILQ_REMOVE(&strq->outqueue, sp, next);
7194                         stcb->asoc.ss_functions.sctp_ss_remove_from_stream(stcb, asoc, strq, sp, send_lock_up);
7195                         if ((strq->state == SCTP_STREAM_RESET_PENDING) &&
7196                             (strq->chunks_on_queues == 0) &&
7197                             TAILQ_EMPTY(&strq->outqueue)) {
7198                                 stcb->asoc.trigger_reset = 1;
7199                         }
7200                         if (sp->net) {
7201                                 sctp_free_remote_addr(sp->net);
7202                                 sp->net = NULL;
7203                         }
7204                         if (sp->data) {
7205                                 sctp_m_freem(sp->data);
7206                                 sp->data = NULL;
7207                         }
7208                         sctp_free_a_strmoq(stcb, sp, so_locked);
7209                         /* we can't be locked to it */
7210                         if (send_lock_up) {
7211                                 SCTP_TCB_SEND_UNLOCK(stcb);
7212                                 send_lock_up = 0;
7213                         }
7214                         /* back to get the next msg */
7215                         goto one_more_time;
7216                 } else {
7217                         /*
7218                          * sender just finished this but still holds a
7219                          * reference
7220                          */
7221                         *giveup = 1;
7222                         to_move = 0;
7223                         goto out_of;
7224                 }
7225         } else {
7226                 /* is there some to get */
7227                 if (sp->length == 0) {
7228                         /* no */
7229                         *giveup = 1;
7230                         to_move = 0;
7231                         goto out_of;
7232                 } else if (sp->discard_rest) {
7233                         if (send_lock_up == 0) {
7234                                 SCTP_TCB_SEND_LOCK(stcb);
7235                                 send_lock_up = 1;
7236                         }
7237                         /* Whack down the size */
7238                         atomic_subtract_int(&stcb->asoc.total_output_queue_size, sp->length);
7239                         if ((stcb->sctp_socket != NULL) &&
7240                             ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
7241                             (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL))) {
7242                                 atomic_subtract_int(&stcb->sctp_socket->so_snd.sb_cc, sp->length);
7243                         }
7244                         if (sp->data) {
7245                                 sctp_m_freem(sp->data);
7246                                 sp->data = NULL;
7247                                 sp->tail_mbuf = NULL;
7248                         }
7249                         sp->length = 0;
7250                         sp->some_taken = 1;
7251                         *giveup = 1;
7252                         to_move = 0;
7253                         goto out_of;
7254                 }
7255         }
7256         some_taken = sp->some_taken;
7257 re_look:
7258         length = sp->length;
7259         if (sp->msg_is_complete) {
7260                 /* The message is complete */
7261                 to_move = min(length, frag_point);
7262                 if (to_move == length) {
7263                         /* All of it fits in the MTU */
7264                         if (sp->some_taken) {
7265                                 rcv_flags |= SCTP_DATA_LAST_FRAG;
7266                         } else {
7267                                 rcv_flags |= SCTP_DATA_NOT_FRAG;
7268                         }
7269                         sp->put_last_out = 1;
7270                         if (sp->sinfo_flags & SCTP_SACK_IMMEDIATELY) {
7271                                 rcv_flags |= SCTP_DATA_SACK_IMMEDIATELY;
7272                         }
7273                 } else {
7274                         /* Not all of it fits, we fragment */
7275                         if (sp->some_taken == 0) {
7276                                 rcv_flags |= SCTP_DATA_FIRST_FRAG;
7277                         }
7278                         sp->some_taken = 1;
7279                 }
7280         } else {
7281                 to_move = sctp_can_we_split_this(stcb, length, space_left, frag_point, eeor_mode);
7282                 if (to_move) {
7283                         /*-
7284                          * We use a snapshot of length in case it
7285                          * is expanding during the compare.
7286                          */
7287                         uint32_t llen;
7288
7289                         llen = length;
7290                         if (to_move >= llen) {
7291                                 to_move = llen;
7292                                 if (send_lock_up == 0) {
7293                                         /*-
7294                                          * We are taking all of an incomplete msg
7295                                          * thus we need a send lock.
7296                                          */
7297                                         SCTP_TCB_SEND_LOCK(stcb);
7298                                         send_lock_up = 1;
7299                                         if (sp->msg_is_complete) {
7300                                                 /*
7301                                                  * the sender finished the
7302                                                  * msg
7303                                                  */
7304                                                 goto re_look;
7305                                         }
7306                                 }
7307                         }
7308                         if (sp->some_taken == 0) {
7309                                 rcv_flags |= SCTP_DATA_FIRST_FRAG;
7310                                 sp->some_taken = 1;
7311                         }
7312                 } else {
7313                         /* Nothing to take. */
7314                         *giveup = 1;
7315                         to_move = 0;
7316                         goto out_of;
7317                 }
7318         }
7319
7320         /* If we reach here, we can copy out a chunk */
7321         sctp_alloc_a_chunk(stcb, chk);
7322         if (chk == NULL) {
7323                 /* No chunk memory */
7324                 *giveup = 1;
7325                 to_move = 0;
7326                 goto out_of;
7327         }
7328         /*
7329          * Setup for unordered if needed by looking at the user sent info
7330          * flags.
7331          */
7332         if (sp->sinfo_flags & SCTP_UNORDERED) {
7333                 rcv_flags |= SCTP_DATA_UNORDERED;
7334         }
7335         if (SCTP_BASE_SYSCTL(sctp_enable_sack_immediately) &&
7336             (sp->sinfo_flags & SCTP_EOF) == SCTP_EOF) {
7337                 rcv_flags |= SCTP_DATA_SACK_IMMEDIATELY;
7338         }
7339         /* clear out the chunk before setting up */
7340         memset(chk, 0, sizeof(*chk));
7341         chk->rec.data.rcv_flags = rcv_flags;
7342
7343         if (to_move >= length) {
7344                 /* we think we can steal the whole thing */
7345                 if ((sp->sender_all_done == 0) && (send_lock_up == 0)) {
7346                         SCTP_TCB_SEND_LOCK(stcb);
7347                         send_lock_up = 1;
7348                 }
7349                 if (to_move < sp->length) {
7350                         /* bail, it changed */
7351                         goto dont_do_it;
7352                 }
7353                 chk->data = sp->data;
7354                 chk->last_mbuf = sp->tail_mbuf;
7355                 /* register the stealing */
7356                 sp->data = sp->tail_mbuf = NULL;
7357         } else {
7358                 struct mbuf *m;
7359
7360 dont_do_it:
7361                 chk->data = SCTP_M_COPYM(sp->data, 0, to_move, M_NOWAIT);
7362                 chk->last_mbuf = NULL;
7363                 if (chk->data == NULL) {
7364                         sp->some_taken = some_taken;
7365                         sctp_free_a_chunk(stcb, chk, so_locked);
7366                         *bail = 1;
7367                         to_move = 0;
7368                         goto out_of;
7369                 }
7370 #ifdef SCTP_MBUF_LOGGING
7371                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
7372                         sctp_log_mbc(chk->data, SCTP_MBUF_ICOPY);
7373                 }
7374 #endif
7375                 /* Pull off the data */
7376                 m_adj(sp->data, to_move);
7377                 /* Now lets work our way down and compact it */
7378                 m = sp->data;
7379                 while (m && (SCTP_BUF_LEN(m) == 0)) {
7380                         sp->data = SCTP_BUF_NEXT(m);
7381                         SCTP_BUF_NEXT(m) = NULL;
7382                         if (sp->tail_mbuf == m) {
7383                                 /*-
7384                                  * Freeing tail? TSNH since
7385                                  * we supposedly were taking less
7386                                  * than the sp->length.
7387                                  */
7388 #ifdef INVARIANTS
7389                                 panic("Huh, freing tail? - TSNH");
7390 #else
7391                                 SCTP_PRINTF("Huh, freeing tail? - TSNH\n");
7392                                 sp->tail_mbuf = sp->data = NULL;
7393                                 sp->length = 0;
7394 #endif
7395
7396                         }
7397                         sctp_m_free(m);
7398                         m = sp->data;
7399                 }
7400         }
7401         if (SCTP_BUF_IS_EXTENDED(chk->data)) {
7402                 chk->copy_by_ref = 1;
7403         } else {
7404                 chk->copy_by_ref = 0;
7405         }
7406         /*
7407          * get last_mbuf and counts of mb usage This is ugly but hopefully
7408          * its only one mbuf.
7409          */
7410         if (chk->last_mbuf == NULL) {
7411                 chk->last_mbuf = chk->data;
7412                 while (SCTP_BUF_NEXT(chk->last_mbuf) != NULL) {
7413                         chk->last_mbuf = SCTP_BUF_NEXT(chk->last_mbuf);
7414                 }
7415         }
7416
7417         if (to_move > length) {
7418                 /*- This should not happen either
7419                  * since we always lower to_move to the size
7420                  * of sp->length if its larger.
7421                  */
7422 #ifdef INVARIANTS
7423                 panic("Huh, how can to_move be larger?");
7424 #else
7425                 SCTP_PRINTF("Huh, how can to_move be larger?\n");
7426                 sp->length = 0;
7427 #endif
7428         } else {
7429                 atomic_subtract_int(&sp->length, to_move);
7430         }
7431         leading = SCTP_DATA_CHUNK_OVERHEAD(stcb);
7432         if (M_LEADINGSPACE(chk->data) < leading) {
7433                 /* Not enough room for a chunk header, get some */
7434                 struct mbuf *m;
7435
7436                 m = sctp_get_mbuf_for_msg(1, 0, M_NOWAIT, 1, MT_DATA);
7437                 if (m == NULL) {
7438                         /*
7439                          * we're in trouble here. _PREPEND below will free
7440                          * all the data if there is no leading space, so we
7441                          * must put the data back and restore.
7442                          */
7443                         if (send_lock_up == 0) {
7444                                 SCTP_TCB_SEND_LOCK(stcb);
7445                                 send_lock_up = 1;
7446                         }
7447                         if (sp->data == NULL) {
7448                                 /* unsteal the data */
7449                                 sp->data = chk->data;
7450                                 sp->tail_mbuf = chk->last_mbuf;
7451                         } else {
7452                                 struct mbuf *m_tmp;
7453
7454                                 /* reassemble the data */
7455                                 m_tmp = sp->data;
7456                                 sp->data = chk->data;
7457                                 SCTP_BUF_NEXT(chk->last_mbuf) = m_tmp;
7458                         }
7459                         sp->some_taken = some_taken;
7460                         atomic_add_int(&sp->length, to_move);
7461                         chk->data = NULL;
7462                         *bail = 1;
7463                         sctp_free_a_chunk(stcb, chk, so_locked);
7464                         to_move = 0;
7465                         goto out_of;
7466                 } else {
7467                         SCTP_BUF_LEN(m) = 0;
7468                         SCTP_BUF_NEXT(m) = chk->data;
7469                         chk->data = m;
7470                         M_ALIGN(chk->data, 4);
7471                 }
7472         }
7473         SCTP_BUF_PREPEND(chk->data, SCTP_DATA_CHUNK_OVERHEAD(stcb), M_NOWAIT);
7474         if (chk->data == NULL) {
7475                 /* HELP, TSNH since we assured it would not above? */
7476 #ifdef INVARIANTS
7477                 panic("prepend failes HELP?");
7478 #else
7479                 SCTP_PRINTF("prepend fails HELP?\n");
7480                 sctp_free_a_chunk(stcb, chk, so_locked);
7481 #endif
7482                 *bail = 1;
7483                 to_move = 0;
7484                 goto out_of;
7485         }
7486         sctp_snd_sb_alloc(stcb, SCTP_DATA_CHUNK_OVERHEAD(stcb));
7487         chk->book_size = chk->send_size = (uint16_t)(to_move + SCTP_DATA_CHUNK_OVERHEAD(stcb));
7488         chk->book_size_scale = 0;
7489         chk->sent = SCTP_DATAGRAM_UNSENT;
7490
7491         chk->flags = 0;
7492         chk->asoc = &stcb->asoc;
7493         chk->pad_inplace = 0;
7494         chk->no_fr_allowed = 0;
7495         if (stcb->asoc.idata_supported == 0) {
7496                 if (rcv_flags & SCTP_DATA_UNORDERED) {
7497                         /* Just use 0. The receiver ignores the values. */
7498                         chk->rec.data.mid = 0;
7499                 } else {
7500                         chk->rec.data.mid = strq->next_mid_ordered;
7501                         if (rcv_flags & SCTP_DATA_LAST_FRAG) {
7502                                 strq->next_mid_ordered++;
7503                         }
7504                 }
7505         } else {
7506                 if (rcv_flags & SCTP_DATA_UNORDERED) {
7507                         chk->rec.data.mid = strq->next_mid_unordered;
7508                         if (rcv_flags & SCTP_DATA_LAST_FRAG) {
7509                                 strq->next_mid_unordered++;
7510                         }
7511                 } else {
7512                         chk->rec.data.mid = strq->next_mid_ordered;
7513                         if (rcv_flags & SCTP_DATA_LAST_FRAG) {
7514                                 strq->next_mid_ordered++;
7515                         }
7516                 }
7517         }
7518         chk->rec.data.sid = sp->sid;
7519         chk->rec.data.ppid = sp->ppid;
7520         chk->rec.data.context = sp->context;
7521         chk->rec.data.doing_fast_retransmit = 0;
7522
7523         chk->rec.data.timetodrop = sp->ts;
7524         chk->flags = sp->act_flags;
7525
7526         if (sp->net) {
7527                 chk->whoTo = sp->net;
7528                 atomic_add_int(&chk->whoTo->ref_count, 1);
7529         } else
7530                 chk->whoTo = NULL;
7531
7532         if (sp->holds_key_ref) {
7533                 chk->auth_keyid = sp->auth_keyid;
7534                 sctp_auth_key_acquire(stcb, chk->auth_keyid);
7535                 chk->holds_key_ref = 1;
7536         }
7537         chk->rec.data.tsn = atomic_fetchadd_int(&asoc->sending_seq, 1);
7538         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_AT_SEND_2_OUTQ) {
7539                 sctp_misc_ints(SCTP_STRMOUT_LOG_SEND,
7540                     (uint32_t)(uintptr_t)stcb, sp->length,
7541                     (uint32_t)((chk->rec.data.sid << 16) | (0x0000ffff & chk->rec.data.mid)),
7542                     chk->rec.data.tsn);
7543         }
7544         if (stcb->asoc.idata_supported == 0) {
7545                 dchkh = mtod(chk->data, struct sctp_data_chunk *);
7546         } else {
7547                 ndchkh = mtod(chk->data, struct sctp_idata_chunk *);
7548         }
7549         /*
7550          * Put the rest of the things in place now. Size was done earlier in
7551          * previous loop prior to padding.
7552          */
7553
7554 #ifdef SCTP_ASOCLOG_OF_TSNS
7555         SCTP_TCB_LOCK_ASSERT(stcb);
7556         if (asoc->tsn_out_at >= SCTP_TSN_LOG_SIZE) {
7557                 asoc->tsn_out_at = 0;
7558                 asoc->tsn_out_wrapped = 1;
7559         }
7560         asoc->out_tsnlog[asoc->tsn_out_at].tsn = chk->rec.data.tsn;
7561         asoc->out_tsnlog[asoc->tsn_out_at].strm = chk->rec.data.sid;
7562         asoc->out_tsnlog[asoc->tsn_out_at].seq = chk->rec.data.mid;
7563         asoc->out_tsnlog[asoc->tsn_out_at].sz = chk->send_size;
7564         asoc->out_tsnlog[asoc->tsn_out_at].flgs = chk->rec.data.rcv_flags;
7565         asoc->out_tsnlog[asoc->tsn_out_at].stcb = (void *)stcb;
7566         asoc->out_tsnlog[asoc->tsn_out_at].in_pos = asoc->tsn_out_at;
7567         asoc->out_tsnlog[asoc->tsn_out_at].in_out = 2;
7568         asoc->tsn_out_at++;
7569 #endif
7570         if (stcb->asoc.idata_supported == 0) {
7571                 dchkh->ch.chunk_type = SCTP_DATA;
7572                 dchkh->ch.chunk_flags = chk->rec.data.rcv_flags;
7573                 dchkh->dp.tsn = htonl(chk->rec.data.tsn);
7574                 dchkh->dp.sid = htons(strq->sid);
7575                 dchkh->dp.ssn = htons((uint16_t)chk->rec.data.mid);
7576                 dchkh->dp.ppid = chk->rec.data.ppid;
7577                 dchkh->ch.chunk_length = htons(chk->send_size);
7578         } else {
7579                 ndchkh->ch.chunk_type = SCTP_IDATA;
7580                 ndchkh->ch.chunk_flags = chk->rec.data.rcv_flags;
7581                 ndchkh->dp.tsn = htonl(chk->rec.data.tsn);
7582                 ndchkh->dp.sid = htons(strq->sid);
7583                 ndchkh->dp.reserved = htons(0);
7584                 ndchkh->dp.mid = htonl(chk->rec.data.mid);
7585                 if (sp->fsn == 0)
7586                         ndchkh->dp.ppid_fsn.ppid = chk->rec.data.ppid;
7587                 else
7588                         ndchkh->dp.ppid_fsn.fsn = htonl(sp->fsn);
7589                 sp->fsn++;
7590                 ndchkh->ch.chunk_length = htons(chk->send_size);
7591         }
7592         /* Now advance the chk->send_size by the actual pad needed. */
7593         if (chk->send_size < SCTP_SIZE32(chk->book_size)) {
7594                 /* need a pad */
7595                 struct mbuf *lm;
7596                 int pads;
7597
7598                 pads = SCTP_SIZE32(chk->book_size) - chk->send_size;
7599                 lm = sctp_pad_lastmbuf(chk->data, pads, chk->last_mbuf);
7600                 if (lm != NULL) {
7601                         chk->last_mbuf = lm;
7602                         chk->pad_inplace = 1;
7603                 }
7604                 chk->send_size += pads;
7605         }
7606         if (PR_SCTP_ENABLED(chk->flags)) {
7607                 asoc->pr_sctp_cnt++;
7608         }
7609         if (sp->msg_is_complete && (sp->length == 0) && (sp->sender_all_done)) {
7610                 /* All done pull and kill the message */
7611                 if (sp->put_last_out == 0) {
7612                         SCTP_PRINTF("Gak, put out entire msg with NO end!-2\n");
7613                         SCTP_PRINTF("sender_done:%d len:%d msg_comp:%d put_last_out:%d send_lock:%d\n",
7614                             sp->sender_all_done,
7615                             sp->length,
7616                             sp->msg_is_complete,
7617                             sp->put_last_out,
7618                             send_lock_up);
7619                 }
7620                 if ((send_lock_up == 0) && (TAILQ_NEXT(sp, next) == NULL)) {
7621                         SCTP_TCB_SEND_LOCK(stcb);
7622                         send_lock_up = 1;
7623                 }
7624                 atomic_subtract_int(&asoc->stream_queue_cnt, 1);
7625                 TAILQ_REMOVE(&strq->outqueue, sp, next);
7626                 stcb->asoc.ss_functions.sctp_ss_remove_from_stream(stcb, asoc, strq, sp, send_lock_up);
7627                 if ((strq->state == SCTP_STREAM_RESET_PENDING) &&
7628                     (strq->chunks_on_queues == 0) &&
7629                     TAILQ_EMPTY(&strq->outqueue)) {
7630                         stcb->asoc.trigger_reset = 1;
7631                 }
7632                 if (sp->net) {
7633                         sctp_free_remote_addr(sp->net);
7634                         sp->net = NULL;
7635                 }
7636                 if (sp->data) {
7637                         sctp_m_freem(sp->data);
7638                         sp->data = NULL;
7639                 }
7640                 sctp_free_a_strmoq(stcb, sp, so_locked);
7641         }
7642         asoc->chunks_on_out_queue++;
7643         strq->chunks_on_queues++;
7644         TAILQ_INSERT_TAIL(&asoc->send_queue, chk, sctp_next);
7645         asoc->send_queue_cnt++;
7646 out_of:
7647         if (send_lock_up) {
7648                 SCTP_TCB_SEND_UNLOCK(stcb);
7649         }
7650         return (to_move);
7651 }
7652
7653
7654 static void
7655 sctp_fill_outqueue(struct sctp_tcb *stcb,
7656     struct sctp_nets *net, int frag_point, int eeor_mode, int *quit_now, int so_locked)
7657 {
7658         struct sctp_association *asoc;
7659         struct sctp_stream_out *strq;
7660         uint32_t space_left, moved, total_moved;
7661         int bail, giveup;
7662
7663         SCTP_TCB_LOCK_ASSERT(stcb);
7664         asoc = &stcb->asoc;
7665         total_moved = 0;
7666         switch (net->ro._l_addr.sa.sa_family) {
7667 #ifdef INET
7668         case AF_INET:
7669                 space_left = net->mtu - SCTP_MIN_V4_OVERHEAD;
7670                 break;
7671 #endif
7672 #ifdef INET6
7673         case AF_INET6:
7674                 space_left = net->mtu - SCTP_MIN_OVERHEAD;
7675                 break;
7676 #endif
7677         default:
7678                 /* TSNH */
7679                 space_left = net->mtu;
7680                 break;
7681         }
7682         /* Need an allowance for the data chunk header too */
7683         space_left -= SCTP_DATA_CHUNK_OVERHEAD(stcb);
7684
7685         /* must make even word boundary */
7686         space_left &= 0xfffffffc;
7687         strq = stcb->asoc.ss_functions.sctp_ss_select_stream(stcb, net, asoc);
7688         giveup = 0;
7689         bail = 0;
7690         while ((space_left > 0) && (strq != NULL)) {
7691                 moved = sctp_move_to_outqueue(stcb, strq, space_left, frag_point,
7692                     &giveup, eeor_mode, &bail, so_locked);
7693                 stcb->asoc.ss_functions.sctp_ss_scheduled(stcb, net, asoc, strq, moved);
7694                 if ((giveup != 0) || (bail != 0)) {
7695                         break;
7696                 }
7697                 strq = stcb->asoc.ss_functions.sctp_ss_select_stream(stcb, net, asoc);
7698                 total_moved += moved;
7699                 if (space_left >= moved) {
7700                         space_left -= moved;
7701                 } else {
7702                         space_left = 0;
7703                 }
7704                 if (space_left >= SCTP_DATA_CHUNK_OVERHEAD(stcb)) {
7705                         space_left -= SCTP_DATA_CHUNK_OVERHEAD(stcb);
7706                 } else {
7707                         space_left = 0;
7708                 }
7709                 space_left &= 0xfffffffc;
7710         }
7711         if (bail != 0)
7712                 *quit_now = 1;
7713
7714         stcb->asoc.ss_functions.sctp_ss_packet_done(stcb, net, asoc);
7715
7716         if (total_moved == 0) {
7717                 if ((stcb->asoc.sctp_cmt_on_off == 0) &&
7718                     (net == stcb->asoc.primary_destination)) {
7719                         /* ran dry for primary network net */
7720                         SCTP_STAT_INCR(sctps_primary_randry);
7721                 } else if (stcb->asoc.sctp_cmt_on_off > 0) {
7722                         /* ran dry with CMT on */
7723                         SCTP_STAT_INCR(sctps_cmt_randry);
7724                 }
7725         }
7726 }
7727
7728 void
7729 sctp_fix_ecn_echo(struct sctp_association *asoc)
7730 {
7731         struct sctp_tmit_chunk *chk;
7732
7733         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
7734                 if (chk->rec.chunk_id.id == SCTP_ECN_ECHO) {
7735                         chk->sent = SCTP_DATAGRAM_UNSENT;
7736                 }
7737         }
7738 }
7739
7740 void
7741 sctp_move_chunks_from_net(struct sctp_tcb *stcb, struct sctp_nets *net)
7742 {
7743         struct sctp_association *asoc;
7744         struct sctp_tmit_chunk *chk;
7745         struct sctp_stream_queue_pending *sp;
7746         unsigned int i;
7747
7748         if (net == NULL) {
7749                 return;
7750         }
7751         asoc = &stcb->asoc;
7752         for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
7753                 TAILQ_FOREACH(sp, &stcb->asoc.strmout[i].outqueue, next) {
7754                         if (sp->net == net) {
7755                                 sctp_free_remote_addr(sp->net);
7756                                 sp->net = NULL;
7757                         }
7758                 }
7759         }
7760         TAILQ_FOREACH(chk, &asoc->send_queue, sctp_next) {
7761                 if (chk->whoTo == net) {
7762                         sctp_free_remote_addr(chk->whoTo);
7763                         chk->whoTo = NULL;
7764                 }
7765         }
7766 }
7767
7768 int
7769 sctp_med_chunk_output(struct sctp_inpcb *inp,
7770     struct sctp_tcb *stcb,
7771     struct sctp_association *asoc,
7772     int *num_out,
7773     int *reason_code,
7774     int control_only, int from_where,
7775     struct timeval *now, int *now_filled, int frag_point, int so_locked)
7776 {
7777         /**
7778          * Ok this is the generic chunk service queue. we must do the
7779          * following:
7780          * - Service the stream queue that is next, moving any
7781          *   message (note I must get a complete message i.e. FIRST/MIDDLE and
7782          *   LAST to the out queue in one pass) and assigning TSN's. This
7783          *   only applys though if the peer does not support NDATA. For NDATA
7784          *   chunks its ok to not send the entire message ;-)
7785          * - Check to see if the cwnd/rwnd allows any output, if so we go ahead and
7786          *   fomulate and send the low level chunks. Making sure to combine
7787          *   any control in the control chunk queue also.
7788          */
7789         struct sctp_nets *net, *start_at, *sack_goes_to = NULL, *old_start_at = NULL;
7790         struct mbuf *outchain, *endoutchain;
7791         struct sctp_tmit_chunk *chk, *nchk;
7792
7793         /* temp arrays for unlinking */
7794         struct sctp_tmit_chunk *data_list[SCTP_MAX_DATA_BUNDLING];
7795         int no_fragmentflg, error;
7796         unsigned int max_rwnd_per_dest, max_send_per_dest;
7797         int one_chunk, hbflag, skip_data_for_this_net;
7798         int asconf, cookie, no_out_cnt;
7799         int bundle_at, ctl_cnt, no_data_chunks, eeor_mode;
7800         unsigned int mtu, r_mtu, omtu, mx_mtu, to_out;
7801         int tsns_sent = 0;
7802         uint32_t auth_offset;
7803         struct sctp_auth_chunk *auth;
7804         uint16_t auth_keyid;
7805         int override_ok = 1;
7806         int skip_fill_up = 0;
7807         int data_auth_reqd = 0;
7808
7809         /*
7810          * JRS 5/14/07 - Add flag for whether a heartbeat is sent to the
7811          * destination.
7812          */
7813         int quit_now = 0;
7814
7815         *num_out = 0;
7816         *reason_code = 0;
7817         auth_keyid = stcb->asoc.authinfo.active_keyid;
7818         if ((asoc->state & SCTP_STATE_SHUTDOWN_PENDING) ||
7819             (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_RECEIVED) ||
7820             (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_EXPLICIT_EOR))) {
7821                 eeor_mode = 1;
7822         } else {
7823                 eeor_mode = 0;
7824         }
7825         ctl_cnt = no_out_cnt = asconf = cookie = 0;
7826         /*
7827          * First lets prime the pump. For each destination, if there is room
7828          * in the flight size, attempt to pull an MTU's worth out of the
7829          * stream queues into the general send_queue
7830          */
7831 #ifdef SCTP_AUDITING_ENABLED
7832         sctp_audit_log(0xC2, 2);
7833 #endif
7834         SCTP_TCB_LOCK_ASSERT(stcb);
7835         hbflag = 0;
7836         if (control_only)
7837                 no_data_chunks = 1;
7838         else
7839                 no_data_chunks = 0;
7840
7841         /* Nothing to possible to send? */
7842         if ((TAILQ_EMPTY(&asoc->control_send_queue) ||
7843             (asoc->ctrl_queue_cnt == stcb->asoc.ecn_echo_cnt_onq)) &&
7844             TAILQ_EMPTY(&asoc->asconf_send_queue) &&
7845             TAILQ_EMPTY(&asoc->send_queue) &&
7846             sctp_is_there_unsent_data(stcb, so_locked) == 0) {
7847 nothing_to_send:
7848                 *reason_code = 9;
7849                 return (0);
7850         }
7851         if (asoc->peers_rwnd == 0) {
7852                 /* No room in peers rwnd */
7853                 *reason_code = 1;
7854                 if (asoc->total_flight > 0) {
7855                         /* we are allowed one chunk in flight */
7856                         no_data_chunks = 1;
7857                 }
7858         }
7859         if (stcb->asoc.ecn_echo_cnt_onq) {
7860                 /* Record where a sack goes, if any */
7861                 if (no_data_chunks &&
7862                     (asoc->ctrl_queue_cnt == stcb->asoc.ecn_echo_cnt_onq)) {
7863                         /* Nothing but ECNe to send - we don't do that */
7864                         goto nothing_to_send;
7865                 }
7866                 TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
7867                         if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
7868                             (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK)) {
7869                                 sack_goes_to = chk->whoTo;
7870                                 break;
7871                         }
7872                 }
7873         }
7874         max_rwnd_per_dest = ((asoc->peers_rwnd + asoc->total_flight) / asoc->numnets);
7875         if (stcb->sctp_socket)
7876                 max_send_per_dest = SCTP_SB_LIMIT_SND(stcb->sctp_socket) / asoc->numnets;
7877         else
7878                 max_send_per_dest = 0;
7879         if (no_data_chunks == 0) {
7880                 /* How many non-directed chunks are there? */
7881                 TAILQ_FOREACH(chk, &asoc->send_queue, sctp_next) {
7882                         if (chk->whoTo == NULL) {
7883                                 /*
7884                                  * We already have non-directed chunks on
7885                                  * the queue, no need to do a fill-up.
7886                                  */
7887                                 skip_fill_up = 1;
7888                                 break;
7889                         }
7890                 }
7891
7892         }
7893         if ((no_data_chunks == 0) &&
7894             (skip_fill_up == 0) &&
7895             (!stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc))) {
7896                 TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
7897                         /*
7898                          * This for loop we are in takes in each net, if
7899                          * its's got space in cwnd and has data sent to it
7900                          * (when CMT is off) then it calls
7901                          * sctp_fill_outqueue for the net. This gets data on
7902                          * the send queue for that network.
7903                          *
7904                          * In sctp_fill_outqueue TSN's are assigned and data
7905                          * is copied out of the stream buffers. Note mostly
7906                          * copy by reference (we hope).
7907                          */
7908                         net->window_probe = 0;
7909                         if ((net != stcb->asoc.alternate) &&
7910                             ((net->dest_state & SCTP_ADDR_PF) ||
7911                             (!(net->dest_state & SCTP_ADDR_REACHABLE)) ||
7912                             (net->dest_state & SCTP_ADDR_UNCONFIRMED))) {
7913                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
7914                                         sctp_log_cwnd(stcb, net, 1,
7915                                             SCTP_CWND_LOG_FILL_OUTQ_CALLED);
7916                                 }
7917                                 continue;
7918                         }
7919                         if ((stcb->asoc.cc_functions.sctp_cwnd_new_transmission_begins) &&
7920                             (net->flight_size == 0)) {
7921                                 (*stcb->asoc.cc_functions.sctp_cwnd_new_transmission_begins) (stcb, net);
7922                         }
7923                         if (net->flight_size >= net->cwnd) {
7924                                 /* skip this network, no room - can't fill */
7925                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
7926                                         sctp_log_cwnd(stcb, net, 3,
7927                                             SCTP_CWND_LOG_FILL_OUTQ_CALLED);
7928                                 }
7929                                 continue;
7930                         }
7931                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
7932                                 sctp_log_cwnd(stcb, net, 4, SCTP_CWND_LOG_FILL_OUTQ_CALLED);
7933                         }
7934                         sctp_fill_outqueue(stcb, net, frag_point, eeor_mode, &quit_now, so_locked);
7935                         if (quit_now) {
7936                                 /* memory alloc failure */
7937                                 no_data_chunks = 1;
7938                                 break;
7939                         }
7940                 }
7941         }
7942         /* now service each destination and send out what we can for it */
7943         /* Nothing to send? */
7944         if (TAILQ_EMPTY(&asoc->control_send_queue) &&
7945             TAILQ_EMPTY(&asoc->asconf_send_queue) &&
7946             TAILQ_EMPTY(&asoc->send_queue)) {
7947                 *reason_code = 8;
7948                 return (0);
7949         }
7950
7951         if (asoc->sctp_cmt_on_off > 0) {
7952                 /* get the last start point */
7953                 start_at = asoc->last_net_cmt_send_started;
7954                 if (start_at == NULL) {
7955                         /* null so to beginning */
7956                         start_at = TAILQ_FIRST(&asoc->nets);
7957                 } else {
7958                         start_at = TAILQ_NEXT(asoc->last_net_cmt_send_started, sctp_next);
7959                         if (start_at == NULL) {
7960                                 start_at = TAILQ_FIRST(&asoc->nets);
7961                         }
7962                 }
7963                 asoc->last_net_cmt_send_started = start_at;
7964         } else {
7965                 start_at = TAILQ_FIRST(&asoc->nets);
7966         }
7967         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
7968                 if (chk->whoTo == NULL) {
7969                         if (asoc->alternate) {
7970                                 chk->whoTo = asoc->alternate;
7971                         } else {
7972                                 chk->whoTo = asoc->primary_destination;
7973                         }
7974                         atomic_add_int(&chk->whoTo->ref_count, 1);
7975                 }
7976         }
7977         old_start_at = NULL;
7978 again_one_more_time:
7979         for (net = start_at; net != NULL; net = TAILQ_NEXT(net, sctp_next)) {
7980                 /* how much can we send? */
7981                 /* SCTPDBG("Examine for sending net:%x\n", (uint32_t)net); */
7982                 if (old_start_at && (old_start_at == net)) {
7983                         /* through list ocmpletely. */
7984                         break;
7985                 }
7986                 tsns_sent = 0xa;
7987                 if (TAILQ_EMPTY(&asoc->control_send_queue) &&
7988                     TAILQ_EMPTY(&asoc->asconf_send_queue) &&
7989                     (net->flight_size >= net->cwnd)) {
7990                         /*
7991                          * Nothing on control or asconf and flight is full,
7992                          * we can skip even in the CMT case.
7993                          */
7994                         continue;
7995                 }
7996                 bundle_at = 0;
7997                 endoutchain = outchain = NULL;
7998                 auth = NULL;
7999                 auth_offset = 0;
8000                 no_fragmentflg = 1;
8001                 one_chunk = 0;
8002                 if (net->dest_state & SCTP_ADDR_UNCONFIRMED) {
8003                         skip_data_for_this_net = 1;
8004                 } else {
8005                         skip_data_for_this_net = 0;
8006                 }
8007                 switch (((struct sockaddr *)&net->ro._l_addr)->sa_family) {
8008 #ifdef INET
8009                 case AF_INET:
8010                         mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
8011                         break;
8012 #endif
8013 #ifdef INET6
8014                 case AF_INET6:
8015                         mtu = net->mtu - SCTP_MIN_OVERHEAD;
8016                         break;
8017 #endif
8018                 default:
8019                         /* TSNH */
8020                         mtu = net->mtu;
8021                         break;
8022                 }
8023                 mx_mtu = mtu;
8024                 to_out = 0;
8025                 if (mtu > asoc->peers_rwnd) {
8026                         if (asoc->total_flight > 0) {
8027                                 /* We have a packet in flight somewhere */
8028                                 r_mtu = asoc->peers_rwnd;
8029                         } else {
8030                                 /* We are always allowed to send one MTU out */
8031                                 one_chunk = 1;
8032                                 r_mtu = mtu;
8033                         }
8034                 } else {
8035                         r_mtu = mtu;
8036                 }
8037                 error = 0;
8038                 /************************/
8039                 /* ASCONF transmission */
8040                 /************************/
8041                 /* Now first lets go through the asconf queue */
8042                 TAILQ_FOREACH_SAFE(chk, &asoc->asconf_send_queue, sctp_next, nchk) {
8043                         if (chk->rec.chunk_id.id != SCTP_ASCONF) {
8044                                 continue;
8045                         }
8046                         if (chk->whoTo == NULL) {
8047                                 if (asoc->alternate == NULL) {
8048                                         if (asoc->primary_destination != net) {
8049                                                 break;
8050                                         }
8051                                 } else {
8052                                         if (asoc->alternate != net) {
8053                                                 break;
8054                                         }
8055                                 }
8056                         } else {
8057                                 if (chk->whoTo != net) {
8058                                         break;
8059                                 }
8060                         }
8061                         if (chk->data == NULL) {
8062                                 break;
8063                         }
8064                         if (chk->sent != SCTP_DATAGRAM_UNSENT &&
8065                             chk->sent != SCTP_DATAGRAM_RESEND) {
8066                                 break;
8067                         }
8068                         /*
8069                          * if no AUTH is yet included and this chunk
8070                          * requires it, make sure to account for it.  We
8071                          * don't apply the size until the AUTH chunk is
8072                          * actually added below in case there is no room for
8073                          * this chunk. NOTE: we overload the use of "omtu"
8074                          * here
8075                          */
8076                         if ((auth == NULL) &&
8077                             sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
8078                             stcb->asoc.peer_auth_chunks)) {
8079                                 omtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
8080                         } else
8081                                 omtu = 0;
8082                         /* Here we do NOT factor the r_mtu */
8083                         if ((chk->send_size < (int)(mtu - omtu)) ||
8084                             (chk->flags & CHUNK_FLAGS_FRAGMENT_OK)) {
8085                                 /*
8086                                  * We probably should glom the mbuf chain
8087                                  * from the chk->data for control but the
8088                                  * problem is it becomes yet one more level
8089                                  * of tracking to do if for some reason
8090                                  * output fails. Then I have got to
8091                                  * reconstruct the merged control chain.. el
8092                                  * yucko.. for now we take the easy way and
8093                                  * do the copy
8094                                  */
8095                                 /*
8096                                  * Add an AUTH chunk, if chunk requires it
8097                                  * save the offset into the chain for AUTH
8098                                  */
8099                                 if ((auth == NULL) &&
8100                                     (sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
8101                                     stcb->asoc.peer_auth_chunks))) {
8102                                         outchain = sctp_add_auth_chunk(outchain,
8103                                             &endoutchain,
8104                                             &auth,
8105                                             &auth_offset,
8106                                             stcb,
8107                                             chk->rec.chunk_id.id);
8108                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8109                                 }
8110                                 outchain = sctp_copy_mbufchain(chk->data, outchain, &endoutchain,
8111                                     (int)chk->rec.chunk_id.can_take_data,
8112                                     chk->send_size, chk->copy_by_ref);
8113                                 if (outchain == NULL) {
8114                                         *reason_code = 8;
8115                                         SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
8116                                         return (ENOMEM);
8117                                 }
8118                                 SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8119                                 /* update our MTU size */
8120                                 if (mtu > (chk->send_size + omtu))
8121                                         mtu -= (chk->send_size + omtu);
8122                                 else
8123                                         mtu = 0;
8124                                 to_out += (chk->send_size + omtu);
8125                                 /* Do clear IP_DF ? */
8126                                 if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
8127                                         no_fragmentflg = 0;
8128                                 }
8129                                 if (chk->rec.chunk_id.can_take_data)
8130                                         chk->data = NULL;
8131                                 /*
8132                                  * set hb flag since we can use these for
8133                                  * RTO
8134                                  */
8135                                 hbflag = 1;
8136                                 asconf = 1;
8137                                 /*
8138                                  * should sysctl this: don't bundle data
8139                                  * with ASCONF since it requires AUTH
8140                                  */
8141                                 no_data_chunks = 1;
8142                                 chk->sent = SCTP_DATAGRAM_SENT;
8143                                 if (chk->whoTo == NULL) {
8144                                         chk->whoTo = net;
8145                                         atomic_add_int(&net->ref_count, 1);
8146                                 }
8147                                 chk->snd_count++;
8148                                 if (mtu == 0) {
8149                                         /*
8150                                          * Ok we are out of room but we can
8151                                          * output without effecting the
8152                                          * flight size since this little guy
8153                                          * is a control only packet.
8154                                          */
8155                                         sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp, stcb, net);
8156                                         /*
8157                                          * do NOT clear the asconf flag as
8158                                          * it is used to do appropriate
8159                                          * source address selection.
8160                                          */
8161                                         if (*now_filled == 0) {
8162                                                 (void)SCTP_GETTIME_TIMEVAL(now);
8163                                                 *now_filled = 1;
8164                                         }
8165                                         net->last_sent_time = *now;
8166                                         hbflag = 0;
8167                                         if ((error = sctp_lowlevel_chunk_output(inp, stcb, net,
8168                                             (struct sockaddr *)&net->ro._l_addr,
8169                                             outchain, auth_offset, auth,
8170                                             stcb->asoc.authinfo.active_keyid,
8171                                             no_fragmentflg, 0, asconf,
8172                                             inp->sctp_lport, stcb->rport,
8173                                             htonl(stcb->asoc.peer_vtag),
8174                                             net->port, NULL,
8175                                             0, 0,
8176                                             so_locked))) {
8177                                                 /*
8178                                                  * error, we could not
8179                                                  * output
8180                                                  */
8181                                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
8182                                                 if (from_where == 0) {
8183                                                         SCTP_STAT_INCR(sctps_lowlevelerrusr);
8184                                                 }
8185                                                 if (error == ENOBUFS) {
8186                                                         asoc->ifp_had_enobuf = 1;
8187                                                         SCTP_STAT_INCR(sctps_lowlevelerr);
8188                                                 }
8189                                                 /* error, could not output */
8190                                                 if (error == EHOSTUNREACH) {
8191                                                         /*
8192                                                          * Destination went
8193                                                          * unreachable
8194                                                          * during this send
8195                                                          */
8196                                                         sctp_move_chunks_from_net(stcb, net);
8197                                                 }
8198                                                 *reason_code = 7;
8199                                                 break;
8200                                         } else {
8201                                                 asoc->ifp_had_enobuf = 0;
8202                                         }
8203                                         /*
8204                                          * increase the number we sent, if a
8205                                          * cookie is sent we don't tell them
8206                                          * any was sent out.
8207                                          */
8208                                         outchain = endoutchain = NULL;
8209                                         auth = NULL;
8210                                         auth_offset = 0;
8211                                         if (!no_out_cnt)
8212                                                 *num_out += ctl_cnt;
8213                                         /* recalc a clean slate and setup */
8214                                         switch (net->ro._l_addr.sa.sa_family) {
8215 #ifdef INET
8216                                         case AF_INET:
8217                                                 mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
8218                                                 break;
8219 #endif
8220 #ifdef INET6
8221                                         case AF_INET6:
8222                                                 mtu = net->mtu - SCTP_MIN_OVERHEAD;
8223                                                 break;
8224 #endif
8225                                         default:
8226                                                 /* TSNH */
8227                                                 mtu = net->mtu;
8228                                                 break;
8229                                         }
8230                                         to_out = 0;
8231                                         no_fragmentflg = 1;
8232                                 }
8233                         }
8234                 }
8235                 if (error != 0) {
8236                         /* try next net */
8237                         continue;
8238                 }
8239                 /************************/
8240                 /* Control transmission */
8241                 /************************/
8242                 /* Now first lets go through the control queue */
8243                 TAILQ_FOREACH_SAFE(chk, &asoc->control_send_queue, sctp_next, nchk) {
8244                         if ((sack_goes_to) &&
8245                             (chk->rec.chunk_id.id == SCTP_ECN_ECHO) &&
8246                             (chk->whoTo != sack_goes_to)) {
8247                                 /*
8248                                  * if we have a sack in queue, and we are
8249                                  * looking at an ecn echo that is NOT queued
8250                                  * to where the sack is going..
8251                                  */
8252                                 if (chk->whoTo == net) {
8253                                         /*
8254                                          * Don't transmit it to where its
8255                                          * going (current net)
8256                                          */
8257                                         continue;
8258                                 } else if (sack_goes_to == net) {
8259                                         /*
8260                                          * But do transmit it to this
8261                                          * address
8262                                          */
8263                                         goto skip_net_check;
8264                                 }
8265                         }
8266                         if (chk->whoTo == NULL) {
8267                                 if (asoc->alternate == NULL) {
8268                                         if (asoc->primary_destination != net) {
8269                                                 continue;
8270                                         }
8271                                 } else {
8272                                         if (asoc->alternate != net) {
8273                                                 continue;
8274                                         }
8275                                 }
8276                         } else {
8277                                 if (chk->whoTo != net) {
8278                                         continue;
8279                                 }
8280                         }
8281         skip_net_check:
8282                         if (chk->data == NULL) {
8283                                 continue;
8284                         }
8285                         if (chk->sent != SCTP_DATAGRAM_UNSENT) {
8286                                 /*
8287                                  * It must be unsent. Cookies and ASCONF's
8288                                  * hang around but there timers will force
8289                                  * when marked for resend.
8290                                  */
8291                                 continue;
8292                         }
8293                         /*
8294                          * if no AUTH is yet included and this chunk
8295                          * requires it, make sure to account for it.  We
8296                          * don't apply the size until the AUTH chunk is
8297                          * actually added below in case there is no room for
8298                          * this chunk. NOTE: we overload the use of "omtu"
8299                          * here
8300                          */
8301                         if ((auth == NULL) &&
8302                             sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
8303                             stcb->asoc.peer_auth_chunks)) {
8304                                 omtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
8305                         } else
8306                                 omtu = 0;
8307                         /* Here we do NOT factor the r_mtu */
8308                         if ((chk->send_size <= (int)(mtu - omtu)) ||
8309                             (chk->flags & CHUNK_FLAGS_FRAGMENT_OK)) {
8310                                 /*
8311                                  * We probably should glom the mbuf chain
8312                                  * from the chk->data for control but the
8313                                  * problem is it becomes yet one more level
8314                                  * of tracking to do if for some reason
8315                                  * output fails. Then I have got to
8316                                  * reconstruct the merged control chain.. el
8317                                  * yucko.. for now we take the easy way and
8318                                  * do the copy
8319                                  */
8320                                 /*
8321                                  * Add an AUTH chunk, if chunk requires it
8322                                  * save the offset into the chain for AUTH
8323                                  */
8324                                 if ((auth == NULL) &&
8325                                     (sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
8326                                     stcb->asoc.peer_auth_chunks))) {
8327                                         outchain = sctp_add_auth_chunk(outchain,
8328                                             &endoutchain,
8329                                             &auth,
8330                                             &auth_offset,
8331                                             stcb,
8332                                             chk->rec.chunk_id.id);
8333                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8334                                 }
8335                                 outchain = sctp_copy_mbufchain(chk->data, outchain, &endoutchain,
8336                                     (int)chk->rec.chunk_id.can_take_data,
8337                                     chk->send_size, chk->copy_by_ref);
8338                                 if (outchain == NULL) {
8339                                         *reason_code = 8;
8340                                         SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
8341                                         return (ENOMEM);
8342                                 }
8343                                 SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8344                                 /* update our MTU size */
8345                                 if (mtu > (chk->send_size + omtu))
8346                                         mtu -= (chk->send_size + omtu);
8347                                 else
8348                                         mtu = 0;
8349                                 to_out += (chk->send_size + omtu);
8350                                 /* Do clear IP_DF ? */
8351                                 if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
8352                                         no_fragmentflg = 0;
8353                                 }
8354                                 if (chk->rec.chunk_id.can_take_data)
8355                                         chk->data = NULL;
8356                                 /* Mark things to be removed, if needed */
8357                                 if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
8358                                     (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK) ||  /* EY */
8359                                     (chk->rec.chunk_id.id == SCTP_HEARTBEAT_REQUEST) ||
8360                                     (chk->rec.chunk_id.id == SCTP_HEARTBEAT_ACK) ||
8361                                     (chk->rec.chunk_id.id == SCTP_SHUTDOWN) ||
8362                                     (chk->rec.chunk_id.id == SCTP_SHUTDOWN_ACK) ||
8363                                     (chk->rec.chunk_id.id == SCTP_OPERATION_ERROR) ||
8364                                     (chk->rec.chunk_id.id == SCTP_COOKIE_ACK) ||
8365                                     (chk->rec.chunk_id.id == SCTP_ECN_CWR) ||
8366                                     (chk->rec.chunk_id.id == SCTP_PACKET_DROPPED) ||
8367                                     (chk->rec.chunk_id.id == SCTP_ASCONF_ACK)) {
8368                                         if (chk->rec.chunk_id.id == SCTP_HEARTBEAT_REQUEST) {
8369                                                 hbflag = 1;
8370                                         }
8371                                         /* remove these chunks at the end */
8372                                         if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
8373                                             (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK)) {
8374                                                 /* turn off the timer */
8375                                                 if (SCTP_OS_TIMER_PENDING(&stcb->asoc.dack_timer.timer)) {
8376                                                         sctp_timer_stop(SCTP_TIMER_TYPE_RECV,
8377                                                             inp, stcb, NULL,
8378                                                             SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_1);
8379                                                 }
8380                                         }
8381                                         ctl_cnt++;
8382                                 } else {
8383                                         /*
8384                                          * Other chunks, since they have
8385                                          * timers running (i.e. COOKIE) we
8386                                          * just "trust" that it gets sent or
8387                                          * retransmitted.
8388                                          */
8389                                         ctl_cnt++;
8390                                         if (chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
8391                                                 cookie = 1;
8392                                                 no_out_cnt = 1;
8393                                         } else if (chk->rec.chunk_id.id == SCTP_ECN_ECHO) {
8394                                                 /*
8395                                                  * Increment ecne send count
8396                                                  * here this means we may be
8397                                                  * over-zealous in our
8398                                                  * counting if the send
8399                                                  * fails, but its the best
8400                                                  * place to do it (we used
8401                                                  * to do it in the queue of
8402                                                  * the chunk, but that did
8403                                                  * not tell how many times
8404                                                  * it was sent.
8405                                                  */
8406                                                 SCTP_STAT_INCR(sctps_sendecne);
8407                                         }
8408                                         chk->sent = SCTP_DATAGRAM_SENT;
8409                                         if (chk->whoTo == NULL) {
8410                                                 chk->whoTo = net;
8411                                                 atomic_add_int(&net->ref_count, 1);
8412                                         }
8413                                         chk->snd_count++;
8414                                 }
8415                                 if (mtu == 0) {
8416                                         /*
8417                                          * Ok we are out of room but we can
8418                                          * output without effecting the
8419                                          * flight size since this little guy
8420                                          * is a control only packet.
8421                                          */
8422                                         if (asconf) {
8423                                                 sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp, stcb, net);
8424                                                 /*
8425                                                  * do NOT clear the asconf
8426                                                  * flag as it is used to do
8427                                                  * appropriate source
8428                                                  * address selection.
8429                                                  */
8430                                         }
8431                                         if (cookie) {
8432                                                 sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, inp, stcb, net);
8433                                                 cookie = 0;
8434                                         }
8435                                         /* Only HB or ASCONF advances time */
8436                                         if (hbflag) {
8437                                                 if (*now_filled == 0) {
8438                                                         (void)SCTP_GETTIME_TIMEVAL(now);
8439                                                         *now_filled = 1;
8440                                                 }
8441                                                 net->last_sent_time = *now;
8442                                                 hbflag = 0;
8443                                         }
8444                                         if ((error = sctp_lowlevel_chunk_output(inp, stcb, net,
8445                                             (struct sockaddr *)&net->ro._l_addr,
8446                                             outchain,
8447                                             auth_offset, auth,
8448                                             stcb->asoc.authinfo.active_keyid,
8449                                             no_fragmentflg, 0, asconf,
8450                                             inp->sctp_lport, stcb->rport,
8451                                             htonl(stcb->asoc.peer_vtag),
8452                                             net->port, NULL,
8453                                             0, 0,
8454                                             so_locked))) {
8455                                                 /*
8456                                                  * error, we could not
8457                                                  * output
8458                                                  */
8459                                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
8460                                                 if (from_where == 0) {
8461                                                         SCTP_STAT_INCR(sctps_lowlevelerrusr);
8462                                                 }
8463                                                 if (error == ENOBUFS) {
8464                                                         asoc->ifp_had_enobuf = 1;
8465                                                         SCTP_STAT_INCR(sctps_lowlevelerr);
8466                                                 }
8467                                                 if (error == EHOSTUNREACH) {
8468                                                         /*
8469                                                          * Destination went
8470                                                          * unreachable
8471                                                          * during this send
8472                                                          */
8473                                                         sctp_move_chunks_from_net(stcb, net);
8474                                                 }
8475                                                 *reason_code = 7;
8476                                                 break;
8477                                         } else {
8478                                                 asoc->ifp_had_enobuf = 0;
8479                                         }
8480                                         /*
8481                                          * increase the number we sent, if a
8482                                          * cookie is sent we don't tell them
8483                                          * any was sent out.
8484                                          */
8485                                         outchain = endoutchain = NULL;
8486                                         auth = NULL;
8487                                         auth_offset = 0;
8488                                         if (!no_out_cnt)
8489                                                 *num_out += ctl_cnt;
8490                                         /* recalc a clean slate and setup */
8491                                         switch (net->ro._l_addr.sa.sa_family) {
8492 #ifdef INET
8493                                         case AF_INET:
8494                                                 mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
8495                                                 break;
8496 #endif
8497 #ifdef INET6
8498                                         case AF_INET6:
8499                                                 mtu = net->mtu - SCTP_MIN_OVERHEAD;
8500                                                 break;
8501 #endif
8502                                         default:
8503                                                 /* TSNH */
8504                                                 mtu = net->mtu;
8505                                                 break;
8506                                         }
8507                                         to_out = 0;
8508                                         no_fragmentflg = 1;
8509                                 }
8510                         }
8511                 }
8512                 if (error != 0) {
8513                         /* try next net */
8514                         continue;
8515                 }
8516                 /* JRI: if dest is in PF state, do not send data to it */
8517                 if ((asoc->sctp_cmt_on_off > 0) &&
8518                     (net != stcb->asoc.alternate) &&
8519                     (net->dest_state & SCTP_ADDR_PF)) {
8520                         goto no_data_fill;
8521                 }
8522                 if (net->flight_size >= net->cwnd) {
8523                         goto no_data_fill;
8524                 }
8525                 if ((asoc->sctp_cmt_on_off > 0) &&
8526                     (SCTP_BASE_SYSCTL(sctp_buffer_splitting) & SCTP_RECV_BUFFER_SPLITTING) &&
8527                     (net->flight_size > max_rwnd_per_dest)) {
8528                         goto no_data_fill;
8529                 }
8530                 /*
8531                  * We need a specific accounting for the usage of the send
8532                  * buffer. We also need to check the number of messages per
8533                  * net. For now, this is better than nothing and it disabled
8534                  * by default...
8535                  */
8536                 if ((asoc->sctp_cmt_on_off > 0) &&
8537                     (SCTP_BASE_SYSCTL(sctp_buffer_splitting) & SCTP_SEND_BUFFER_SPLITTING) &&
8538                     (max_send_per_dest > 0) &&
8539                     (net->flight_size > max_send_per_dest)) {
8540                         goto no_data_fill;
8541                 }
8542                 /*********************/
8543                 /* Data transmission */
8544                 /*********************/
8545                 /*
8546                  * if AUTH for DATA is required and no AUTH has been added
8547                  * yet, account for this in the mtu now... if no data can be
8548                  * bundled, this adjustment won't matter anyways since the
8549                  * packet will be going out...
8550                  */
8551                 data_auth_reqd = sctp_auth_is_required_chunk(SCTP_DATA,
8552                     stcb->asoc.peer_auth_chunks);
8553                 if (data_auth_reqd && (auth == NULL)) {
8554                         mtu -= sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
8555                 }
8556                 /* now lets add any data within the MTU constraints */
8557                 switch (((struct sockaddr *)&net->ro._l_addr)->sa_family) {
8558 #ifdef INET
8559                 case AF_INET:
8560                         if (net->mtu > SCTP_MIN_V4_OVERHEAD)
8561                                 omtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
8562                         else
8563                                 omtu = 0;
8564                         break;
8565 #endif
8566 #ifdef INET6
8567                 case AF_INET6:
8568                         if (net->mtu > SCTP_MIN_OVERHEAD)
8569                                 omtu = net->mtu - SCTP_MIN_OVERHEAD;
8570                         else
8571                                 omtu = 0;
8572                         break;
8573 #endif
8574                 default:
8575                         /* TSNH */
8576                         omtu = 0;
8577                         break;
8578                 }
8579                 if ((((SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) ||
8580                     (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_RECEIVED)) &&
8581                     (skip_data_for_this_net == 0)) ||
8582                     (cookie)) {
8583                         TAILQ_FOREACH_SAFE(chk, &asoc->send_queue, sctp_next, nchk) {
8584                                 if (no_data_chunks) {
8585                                         /* let only control go out */
8586                                         *reason_code = 1;
8587                                         break;
8588                                 }
8589                                 if (net->flight_size >= net->cwnd) {
8590                                         /* skip this net, no room for data */
8591                                         *reason_code = 2;
8592                                         break;
8593                                 }
8594                                 if ((chk->whoTo != NULL) &&
8595                                     (chk->whoTo != net)) {
8596                                         /* Don't send the chunk on this net */
8597                                         continue;
8598                                 }
8599
8600                                 if (asoc->sctp_cmt_on_off == 0) {
8601                                         if ((asoc->alternate) &&
8602                                             (asoc->alternate != net) &&
8603                                             (chk->whoTo == NULL)) {
8604                                                 continue;
8605                                         } else if ((net != asoc->primary_destination) &&
8606                                                     (asoc->alternate == NULL) &&
8607                                             (chk->whoTo == NULL)) {
8608                                                 continue;
8609                                         }
8610                                 }
8611                                 if ((chk->send_size > omtu) && ((chk->flags & CHUNK_FLAGS_FRAGMENT_OK) == 0)) {
8612                                         /*-
8613                                          * strange, we have a chunk that is
8614                                          * to big for its destination and
8615                                          * yet no fragment ok flag.
8616                                          * Something went wrong when the
8617                                          * PMTU changed...we did not mark
8618                                          * this chunk for some reason?? I
8619                                          * will fix it here by letting IP
8620                                          * fragment it for now and printing
8621                                          * a warning. This really should not
8622                                          * happen ...
8623                                          */
8624                                         SCTP_PRINTF("Warning chunk of %d bytes > mtu:%d and yet PMTU disc missed\n",
8625                                             chk->send_size, mtu);
8626                                         chk->flags |= CHUNK_FLAGS_FRAGMENT_OK;
8627                                 }
8628                                 if (SCTP_BASE_SYSCTL(sctp_enable_sack_immediately) &&
8629                                     (asoc->state & SCTP_STATE_SHUTDOWN_PENDING)) {
8630                                         struct sctp_data_chunk *dchkh;
8631
8632                                         dchkh = mtod(chk->data, struct sctp_data_chunk *);
8633                                         dchkh->ch.chunk_flags |= SCTP_DATA_SACK_IMMEDIATELY;
8634                                 }
8635                                 if (((chk->send_size <= mtu) && (chk->send_size <= r_mtu)) ||
8636                                     ((chk->flags & CHUNK_FLAGS_FRAGMENT_OK) && (chk->send_size <= asoc->peers_rwnd))) {
8637                                         /* ok we will add this one */
8638
8639                                         /*
8640                                          * Add an AUTH chunk, if chunk
8641                                          * requires it, save the offset into
8642                                          * the chain for AUTH
8643                                          */
8644                                         if (data_auth_reqd) {
8645                                                 if (auth == NULL) {
8646                                                         outchain = sctp_add_auth_chunk(outchain,
8647                                                             &endoutchain,
8648                                                             &auth,
8649                                                             &auth_offset,
8650                                                             stcb,
8651                                                             SCTP_DATA);
8652                                                         auth_keyid = chk->auth_keyid;
8653                                                         override_ok = 0;
8654                                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8655                                                 } else if (override_ok) {
8656                                                         /*
8657                                                          * use this data's
8658                                                          * keyid
8659                                                          */
8660                                                         auth_keyid = chk->auth_keyid;
8661                                                         override_ok = 0;
8662                                                 } else if (auth_keyid != chk->auth_keyid) {
8663                                                         /*
8664                                                          * different keyid,
8665                                                          * so done bundling
8666                                                          */
8667                                                         break;
8668                                                 }
8669                                         }
8670                                         outchain = sctp_copy_mbufchain(chk->data, outchain, &endoutchain, 0,
8671                                             chk->send_size, chk->copy_by_ref);
8672                                         if (outchain == NULL) {
8673                                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "No memory?\n");
8674                                                 if (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
8675                                                         sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
8676                                                 }
8677                                                 *reason_code = 3;
8678                                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
8679                                                 return (ENOMEM);
8680                                         }
8681                                         /* upate our MTU size */
8682                                         /* Do clear IP_DF ? */
8683                                         if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
8684                                                 no_fragmentflg = 0;
8685                                         }
8686                                         /* unsigned subtraction of mtu */
8687                                         if (mtu > chk->send_size)
8688                                                 mtu -= chk->send_size;
8689                                         else
8690                                                 mtu = 0;
8691                                         /* unsigned subtraction of r_mtu */
8692                                         if (r_mtu > chk->send_size)
8693                                                 r_mtu -= chk->send_size;
8694                                         else
8695                                                 r_mtu = 0;
8696
8697                                         to_out += chk->send_size;
8698                                         if ((to_out > mx_mtu) && no_fragmentflg) {
8699 #ifdef INVARIANTS
8700                                                 panic("Exceeding mtu of %d out size is %d", mx_mtu, to_out);
8701 #else
8702                                                 SCTP_PRINTF("Exceeding mtu of %d out size is %d\n",
8703                                                     mx_mtu, to_out);
8704 #endif
8705                                         }
8706                                         chk->window_probe = 0;
8707                                         data_list[bundle_at++] = chk;
8708                                         if (bundle_at >= SCTP_MAX_DATA_BUNDLING) {
8709                                                 break;
8710                                         }
8711                                         if (chk->sent == SCTP_DATAGRAM_UNSENT) {
8712                                                 if ((chk->rec.data.rcv_flags & SCTP_DATA_UNORDERED) == 0) {
8713                                                         SCTP_STAT_INCR_COUNTER64(sctps_outorderchunks);
8714                                                 } else {
8715                                                         SCTP_STAT_INCR_COUNTER64(sctps_outunorderchunks);
8716                                                 }
8717                                                 if (((chk->rec.data.rcv_flags & SCTP_DATA_LAST_FRAG) == SCTP_DATA_LAST_FRAG) &&
8718                                                     ((chk->rec.data.rcv_flags & SCTP_DATA_FIRST_FRAG) == 0))
8719                                                         /*
8720                                                          * Count number of
8721                                                          * user msg's that
8722                                                          * were fragmented
8723                                                          * we do this by
8724                                                          * counting when we
8725                                                          * see a LAST
8726                                                          * fragment only.
8727                                                          */
8728                                                         SCTP_STAT_INCR_COUNTER64(sctps_fragusrmsgs);
8729                                         }
8730                                         if ((mtu == 0) || (r_mtu == 0) || (one_chunk)) {
8731                                                 if ((one_chunk) && (stcb->asoc.total_flight == 0)) {
8732                                                         data_list[0]->window_probe = 1;
8733                                                         net->window_probe = 1;
8734                                                 }
8735                                                 break;
8736                                         }
8737                                 } else {
8738                                         /*
8739                                          * Must be sent in order of the
8740                                          * TSN's (on a network)
8741                                          */
8742                                         break;
8743                                 }
8744                         }       /* for (chunk gather loop for this net) */
8745                 }               /* if asoc.state OPEN */
8746 no_data_fill:
8747                 /* Is there something to send for this destination? */
8748                 if (outchain) {
8749                         /* We may need to start a control timer or two */
8750                         if (asconf) {
8751                                 sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp,
8752                                     stcb, net);
8753                                 /*
8754                                  * do NOT clear the asconf flag as it is
8755                                  * used to do appropriate source address
8756                                  * selection.
8757                                  */
8758                         }
8759                         if (cookie) {
8760                                 sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, inp, stcb, net);
8761                                 cookie = 0;
8762                         }
8763                         /* must start a send timer if data is being sent */
8764                         if (bundle_at && (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer))) {
8765                                 /*
8766                                  * no timer running on this destination
8767                                  * restart it.
8768                                  */
8769                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
8770                         }
8771                         if (bundle_at || hbflag) {
8772                                 /* For data/asconf and hb set time */
8773                                 if (*now_filled == 0) {
8774                                         (void)SCTP_GETTIME_TIMEVAL(now);
8775                                         *now_filled = 1;
8776                                 }
8777                                 net->last_sent_time = *now;
8778                         }
8779                         /* Now send it, if there is anything to send :> */
8780                         if ((error = sctp_lowlevel_chunk_output(inp,
8781                             stcb,
8782                             net,
8783                             (struct sockaddr *)&net->ro._l_addr,
8784                             outchain,
8785                             auth_offset,
8786                             auth,
8787                             auth_keyid,
8788                             no_fragmentflg,
8789                             bundle_at,
8790                             asconf,
8791                             inp->sctp_lport, stcb->rport,
8792                             htonl(stcb->asoc.peer_vtag),
8793                             net->port, NULL,
8794                             0, 0,
8795                             so_locked))) {
8796                                 /* error, we could not output */
8797                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
8798                                 if (from_where == 0) {
8799                                         SCTP_STAT_INCR(sctps_lowlevelerrusr);
8800                                 }
8801                                 if (error == ENOBUFS) {
8802                                         asoc->ifp_had_enobuf = 1;
8803                                         SCTP_STAT_INCR(sctps_lowlevelerr);
8804                                 }
8805                                 if (error == EHOSTUNREACH) {
8806                                         /*
8807                                          * Destination went unreachable
8808                                          * during this send
8809                                          */
8810                                         sctp_move_chunks_from_net(stcb, net);
8811                                 }
8812                                 *reason_code = 6;
8813                                 /*-
8814                                  * I add this line to be paranoid. As far as
8815                                  * I can tell the continue, takes us back to
8816                                  * the top of the for, but just to make sure
8817                                  * I will reset these again here.
8818                                  */
8819                                 ctl_cnt = bundle_at = 0;
8820                                 continue;       /* This takes us back to the
8821                                                  * for() for the nets. */
8822                         } else {
8823                                 asoc->ifp_had_enobuf = 0;
8824                         }
8825                         endoutchain = NULL;
8826                         auth = NULL;
8827                         auth_offset = 0;
8828                         if (!no_out_cnt) {
8829                                 *num_out += (ctl_cnt + bundle_at);
8830                         }
8831                         if (bundle_at) {
8832                                 /* setup for a RTO measurement */
8833                                 tsns_sent = data_list[0]->rec.data.tsn;
8834                                 /* fill time if not already filled */
8835                                 if (*now_filled == 0) {
8836                                         (void)SCTP_GETTIME_TIMEVAL(&asoc->time_last_sent);
8837                                         *now_filled = 1;
8838                                         *now = asoc->time_last_sent;
8839                                 } else {
8840                                         asoc->time_last_sent = *now;
8841                                 }
8842                                 if (net->rto_needed) {
8843                                         data_list[0]->do_rtt = 1;
8844                                         net->rto_needed = 0;
8845                                 }
8846                                 SCTP_STAT_INCR_BY(sctps_senddata, bundle_at);
8847                                 sctp_clean_up_datalist(stcb, asoc, data_list, bundle_at, net);
8848                         }
8849                         if (one_chunk) {
8850                                 break;
8851                         }
8852                 }
8853                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
8854                         sctp_log_cwnd(stcb, net, tsns_sent, SCTP_CWND_LOG_FROM_SEND);
8855                 }
8856         }
8857         if (old_start_at == NULL) {
8858                 old_start_at = start_at;
8859                 start_at = TAILQ_FIRST(&asoc->nets);
8860                 if (old_start_at)
8861                         goto again_one_more_time;
8862         }
8863
8864         /*
8865          * At the end there should be no NON timed chunks hanging on this
8866          * queue.
8867          */
8868         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
8869                 sctp_log_cwnd(stcb, net, *num_out, SCTP_CWND_LOG_FROM_SEND);
8870         }
8871         if ((*num_out == 0) && (*reason_code == 0)) {
8872                 *reason_code = 4;
8873         } else {
8874                 *reason_code = 5;
8875         }
8876         sctp_clean_up_ctl(stcb, asoc, so_locked);
8877         return (0);
8878 }
8879
8880 void
8881 sctp_queue_op_err(struct sctp_tcb *stcb, struct mbuf *op_err)
8882 {
8883         /*-
8884          * Prepend a OPERATIONAL_ERROR chunk header and put on the end of
8885          * the control chunk queue.
8886          */
8887         struct sctp_chunkhdr *hdr;
8888         struct sctp_tmit_chunk *chk;
8889         struct mbuf *mat, *last_mbuf;
8890         uint32_t chunk_length;
8891         uint16_t padding_length;
8892
8893         SCTP_TCB_LOCK_ASSERT(stcb);
8894         SCTP_BUF_PREPEND(op_err, sizeof(struct sctp_chunkhdr), M_NOWAIT);
8895         if (op_err == NULL) {
8896                 return;
8897         }
8898         last_mbuf = NULL;
8899         chunk_length = 0;
8900         for (mat = op_err; mat != NULL; mat = SCTP_BUF_NEXT(mat)) {
8901                 chunk_length += SCTP_BUF_LEN(mat);
8902                 if (SCTP_BUF_NEXT(mat) == NULL) {
8903                         last_mbuf = mat;
8904                 }
8905         }
8906         if (chunk_length > SCTP_MAX_CHUNK_LENGTH) {
8907                 sctp_m_freem(op_err);
8908                 return;
8909         }
8910         padding_length = chunk_length % 4;
8911         if (padding_length != 0) {
8912                 padding_length = 4 - padding_length;
8913         }
8914         if (padding_length != 0) {
8915                 if (sctp_add_pad_tombuf(last_mbuf, padding_length) == NULL) {
8916                         sctp_m_freem(op_err);
8917                         return;
8918                 }
8919         }
8920         sctp_alloc_a_chunk(stcb, chk);
8921         if (chk == NULL) {
8922                 /* no memory */
8923                 sctp_m_freem(op_err);
8924                 return;
8925         }
8926         chk->copy_by_ref = 0;
8927         chk->rec.chunk_id.id = SCTP_OPERATION_ERROR;
8928         chk->rec.chunk_id.can_take_data = 0;
8929         chk->flags = 0;
8930         chk->send_size = (uint16_t)chunk_length;
8931         chk->sent = SCTP_DATAGRAM_UNSENT;
8932         chk->snd_count = 0;
8933         chk->asoc = &stcb->asoc;
8934         chk->data = op_err;
8935         chk->whoTo = NULL;
8936         hdr = mtod(op_err, struct sctp_chunkhdr *);
8937         hdr->chunk_type = SCTP_OPERATION_ERROR;
8938         hdr->chunk_flags = 0;
8939         hdr->chunk_length = htons(chk->send_size);
8940         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
8941         chk->asoc->ctrl_queue_cnt++;
8942 }
8943
8944 int
8945 sctp_send_cookie_echo(struct mbuf *m,
8946     int offset, int limit,
8947     struct sctp_tcb *stcb,
8948     struct sctp_nets *net)
8949 {
8950         /*-
8951          * pull out the cookie and put it at the front of the control chunk
8952          * queue.
8953          */
8954         int at;
8955         struct mbuf *cookie;
8956         struct sctp_paramhdr param, *phdr;
8957         struct sctp_chunkhdr *hdr;
8958         struct sctp_tmit_chunk *chk;
8959         uint16_t ptype, plen;
8960
8961         SCTP_TCB_LOCK_ASSERT(stcb);
8962         /* First find the cookie in the param area */
8963         cookie = NULL;
8964         at = offset + sizeof(struct sctp_init_chunk);
8965         for (;;) {
8966                 phdr = sctp_get_next_param(m, at, &param, sizeof(param));
8967                 if (phdr == NULL) {
8968                         return (-3);
8969                 }
8970                 ptype = ntohs(phdr->param_type);
8971                 plen = ntohs(phdr->param_length);
8972                 if (plen < sizeof(struct sctp_paramhdr)) {
8973                         return (-6);
8974                 }
8975                 if (ptype == SCTP_STATE_COOKIE) {
8976                         int pad;
8977
8978                         /* found the cookie */
8979                         if (at + plen > limit) {
8980                                 return (-7);
8981                         }
8982                         cookie = SCTP_M_COPYM(m, at, plen, M_NOWAIT);
8983                         if (cookie == NULL) {
8984                                 /* No memory */
8985                                 return (-2);
8986                         }
8987                         if ((pad = (plen % 4)) > 0) {
8988                                 pad = 4 - pad;
8989                         }
8990                         if (pad > 0) {
8991                                 if (sctp_pad_lastmbuf(cookie, pad, NULL) == NULL) {
8992                                         return (-8);
8993                                 }
8994                         }
8995 #ifdef SCTP_MBUF_LOGGING
8996                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
8997                                 sctp_log_mbc(cookie, SCTP_MBUF_ICOPY);
8998                         }
8999 #endif
9000                         break;
9001                 }
9002                 at += SCTP_SIZE32(plen);
9003         }
9004         /* ok, we got the cookie lets change it into a cookie echo chunk */
9005         /* first the change from param to cookie */
9006         hdr = mtod(cookie, struct sctp_chunkhdr *);
9007         hdr->chunk_type = SCTP_COOKIE_ECHO;
9008         hdr->chunk_flags = 0;
9009         /* get the chunk stuff now and place it in the FRONT of the queue */
9010         sctp_alloc_a_chunk(stcb, chk);
9011         if (chk == NULL) {
9012                 /* no memory */
9013                 sctp_m_freem(cookie);
9014                 return (-5);
9015         }
9016         chk->copy_by_ref = 0;
9017         chk->rec.chunk_id.id = SCTP_COOKIE_ECHO;
9018         chk->rec.chunk_id.can_take_data = 0;
9019         chk->flags = CHUNK_FLAGS_FRAGMENT_OK;
9020         chk->send_size = SCTP_SIZE32(plen);
9021         chk->sent = SCTP_DATAGRAM_UNSENT;
9022         chk->snd_count = 0;
9023         chk->asoc = &stcb->asoc;
9024         chk->data = cookie;
9025         chk->whoTo = net;
9026         atomic_add_int(&chk->whoTo->ref_count, 1);
9027         TAILQ_INSERT_HEAD(&chk->asoc->control_send_queue, chk, sctp_next);
9028         chk->asoc->ctrl_queue_cnt++;
9029         return (0);
9030 }
9031
9032 void
9033 sctp_send_heartbeat_ack(struct sctp_tcb *stcb,
9034     struct mbuf *m,
9035     int offset,
9036     int chk_length,
9037     struct sctp_nets *net)
9038 {
9039         /*
9040          * take a HB request and make it into a HB ack and send it.
9041          */
9042         struct mbuf *outchain;
9043         struct sctp_chunkhdr *chdr;
9044         struct sctp_tmit_chunk *chk;
9045
9046         if (net == NULL)
9047                 /* must have a net pointer */
9048                 return;
9049
9050         outchain = SCTP_M_COPYM(m, offset, chk_length, M_NOWAIT);
9051         if (outchain == NULL) {
9052                 /* gak out of memory */
9053                 return;
9054         }
9055 #ifdef SCTP_MBUF_LOGGING
9056         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
9057                 sctp_log_mbc(outchain, SCTP_MBUF_ICOPY);
9058         }
9059 #endif
9060         chdr = mtod(outchain, struct sctp_chunkhdr *);
9061         chdr->chunk_type = SCTP_HEARTBEAT_ACK;
9062         chdr->chunk_flags = 0;
9063         if (chk_length % 4 != 0) {
9064                 sctp_pad_lastmbuf(outchain, 4 - (chk_length % 4), NULL);
9065         }
9066         sctp_alloc_a_chunk(stcb, chk);
9067         if (chk == NULL) {
9068                 /* no memory */
9069                 sctp_m_freem(outchain);
9070                 return;
9071         }
9072         chk->copy_by_ref = 0;
9073         chk->rec.chunk_id.id = SCTP_HEARTBEAT_ACK;
9074         chk->rec.chunk_id.can_take_data = 1;
9075         chk->flags = 0;
9076         chk->send_size = chk_length;
9077         chk->sent = SCTP_DATAGRAM_UNSENT;
9078         chk->snd_count = 0;
9079         chk->asoc = &stcb->asoc;
9080         chk->data = outchain;
9081         chk->whoTo = net;
9082         atomic_add_int(&chk->whoTo->ref_count, 1);
9083         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9084         chk->asoc->ctrl_queue_cnt++;
9085 }
9086
9087 void
9088 sctp_send_cookie_ack(struct sctp_tcb *stcb)
9089 {
9090         /* formulate and queue a cookie-ack back to sender */
9091         struct mbuf *cookie_ack;
9092         struct sctp_chunkhdr *hdr;
9093         struct sctp_tmit_chunk *chk;
9094
9095         SCTP_TCB_LOCK_ASSERT(stcb);
9096
9097         cookie_ack = sctp_get_mbuf_for_msg(sizeof(struct sctp_chunkhdr), 0, M_NOWAIT, 1, MT_HEADER);
9098         if (cookie_ack == NULL) {
9099                 /* no mbuf's */
9100                 return;
9101         }
9102         SCTP_BUF_RESV_UF(cookie_ack, SCTP_MIN_OVERHEAD);
9103         sctp_alloc_a_chunk(stcb, chk);
9104         if (chk == NULL) {
9105                 /* no memory */
9106                 sctp_m_freem(cookie_ack);
9107                 return;
9108         }
9109         chk->copy_by_ref = 0;
9110         chk->rec.chunk_id.id = SCTP_COOKIE_ACK;
9111         chk->rec.chunk_id.can_take_data = 1;
9112         chk->flags = 0;
9113         chk->send_size = sizeof(struct sctp_chunkhdr);
9114         chk->sent = SCTP_DATAGRAM_UNSENT;
9115         chk->snd_count = 0;
9116         chk->asoc = &stcb->asoc;
9117         chk->data = cookie_ack;
9118         if (chk->asoc->last_control_chunk_from != NULL) {
9119                 chk->whoTo = chk->asoc->last_control_chunk_from;
9120                 atomic_add_int(&chk->whoTo->ref_count, 1);
9121         } else {
9122                 chk->whoTo = NULL;
9123         }
9124         hdr = mtod(cookie_ack, struct sctp_chunkhdr *);
9125         hdr->chunk_type = SCTP_COOKIE_ACK;
9126         hdr->chunk_flags = 0;
9127         hdr->chunk_length = htons(chk->send_size);
9128         SCTP_BUF_LEN(cookie_ack) = chk->send_size;
9129         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9130         chk->asoc->ctrl_queue_cnt++;
9131         return;
9132 }
9133
9134
9135 void
9136 sctp_send_shutdown_ack(struct sctp_tcb *stcb, struct sctp_nets *net)
9137 {
9138         /* formulate and queue a SHUTDOWN-ACK back to the sender */
9139         struct mbuf *m_shutdown_ack;
9140         struct sctp_shutdown_ack_chunk *ack_cp;
9141         struct sctp_tmit_chunk *chk;
9142
9143         m_shutdown_ack = sctp_get_mbuf_for_msg(sizeof(struct sctp_shutdown_ack_chunk), 0, M_NOWAIT, 1, MT_HEADER);
9144         if (m_shutdown_ack == NULL) {
9145                 /* no mbuf's */
9146                 return;
9147         }
9148         SCTP_BUF_RESV_UF(m_shutdown_ack, SCTP_MIN_OVERHEAD);
9149         sctp_alloc_a_chunk(stcb, chk);
9150         if (chk == NULL) {
9151                 /* no memory */
9152                 sctp_m_freem(m_shutdown_ack);
9153                 return;
9154         }
9155         chk->copy_by_ref = 0;
9156         chk->rec.chunk_id.id = SCTP_SHUTDOWN_ACK;
9157         chk->rec.chunk_id.can_take_data = 1;
9158         chk->flags = 0;
9159         chk->send_size = sizeof(struct sctp_chunkhdr);
9160         chk->sent = SCTP_DATAGRAM_UNSENT;
9161         chk->snd_count = 0;
9162         chk->asoc = &stcb->asoc;
9163         chk->data = m_shutdown_ack;
9164         chk->whoTo = net;
9165         if (chk->whoTo) {
9166                 atomic_add_int(&chk->whoTo->ref_count, 1);
9167         }
9168         ack_cp = mtod(m_shutdown_ack, struct sctp_shutdown_ack_chunk *);
9169         ack_cp->ch.chunk_type = SCTP_SHUTDOWN_ACK;
9170         ack_cp->ch.chunk_flags = 0;
9171         ack_cp->ch.chunk_length = htons(chk->send_size);
9172         SCTP_BUF_LEN(m_shutdown_ack) = chk->send_size;
9173         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9174         chk->asoc->ctrl_queue_cnt++;
9175         return;
9176 }
9177
9178 void
9179 sctp_send_shutdown(struct sctp_tcb *stcb, struct sctp_nets *net)
9180 {
9181         /* formulate and queue a SHUTDOWN to the sender */
9182         struct mbuf *m_shutdown;
9183         struct sctp_shutdown_chunk *shutdown_cp;
9184         struct sctp_tmit_chunk *chk;
9185
9186         TAILQ_FOREACH(chk, &stcb->asoc.control_send_queue, sctp_next) {
9187                 if (chk->rec.chunk_id.id == SCTP_SHUTDOWN) {
9188                         /* We already have a SHUTDOWN queued. Reuse it. */
9189                         if (chk->whoTo) {
9190                                 sctp_free_remote_addr(chk->whoTo);
9191                                 chk->whoTo = NULL;
9192                         }
9193                         break;
9194                 }
9195         }
9196         if (chk == NULL) {
9197                 m_shutdown = sctp_get_mbuf_for_msg(sizeof(struct sctp_shutdown_chunk), 0, M_NOWAIT, 1, MT_HEADER);
9198                 if (m_shutdown == NULL) {
9199                         /* no mbuf's */
9200                         return;
9201                 }
9202                 SCTP_BUF_RESV_UF(m_shutdown, SCTP_MIN_OVERHEAD);
9203                 sctp_alloc_a_chunk(stcb, chk);
9204                 if (chk == NULL) {
9205                         /* no memory */
9206                         sctp_m_freem(m_shutdown);
9207                         return;
9208                 }
9209                 chk->copy_by_ref = 0;
9210                 chk->rec.chunk_id.id = SCTP_SHUTDOWN;
9211                 chk->rec.chunk_id.can_take_data = 1;
9212                 chk->flags = 0;
9213                 chk->send_size = sizeof(struct sctp_shutdown_chunk);
9214                 chk->sent = SCTP_DATAGRAM_UNSENT;
9215                 chk->snd_count = 0;
9216                 chk->asoc = &stcb->asoc;
9217                 chk->data = m_shutdown;
9218                 chk->whoTo = net;
9219                 if (chk->whoTo) {
9220                         atomic_add_int(&chk->whoTo->ref_count, 1);
9221                 }
9222                 shutdown_cp = mtod(m_shutdown, struct sctp_shutdown_chunk *);
9223                 shutdown_cp->ch.chunk_type = SCTP_SHUTDOWN;
9224                 shutdown_cp->ch.chunk_flags = 0;
9225                 shutdown_cp->ch.chunk_length = htons(chk->send_size);
9226                 shutdown_cp->cumulative_tsn_ack = htonl(stcb->asoc.cumulative_tsn);
9227                 SCTP_BUF_LEN(m_shutdown) = chk->send_size;
9228                 TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9229                 chk->asoc->ctrl_queue_cnt++;
9230         } else {
9231                 TAILQ_REMOVE(&stcb->asoc.control_send_queue, chk, sctp_next);
9232                 chk->whoTo = net;
9233                 if (chk->whoTo) {
9234                         atomic_add_int(&chk->whoTo->ref_count, 1);
9235                 }
9236                 shutdown_cp = mtod(chk->data, struct sctp_shutdown_chunk *);
9237                 shutdown_cp->cumulative_tsn_ack = htonl(stcb->asoc.cumulative_tsn);
9238                 TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
9239         }
9240         return;
9241 }
9242
9243 void
9244 sctp_send_asconf(struct sctp_tcb *stcb, struct sctp_nets *net, int addr_locked)
9245 {
9246         /*
9247          * formulate and queue an ASCONF to the peer. ASCONF parameters
9248          * should be queued on the assoc queue.
9249          */
9250         struct sctp_tmit_chunk *chk;
9251         struct mbuf *m_asconf;
9252         int len;
9253
9254         SCTP_TCB_LOCK_ASSERT(stcb);
9255
9256         if ((!TAILQ_EMPTY(&stcb->asoc.asconf_send_queue)) &&
9257             (!sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_MULTIPLE_ASCONFS))) {
9258                 /* can't send a new one if there is one in flight already */
9259                 return;
9260         }
9261
9262         /* compose an ASCONF chunk, maximum length is PMTU */
9263         m_asconf = sctp_compose_asconf(stcb, &len, addr_locked);
9264         if (m_asconf == NULL) {
9265                 return;
9266         }
9267
9268         sctp_alloc_a_chunk(stcb, chk);
9269         if (chk == NULL) {
9270                 /* no memory */
9271                 sctp_m_freem(m_asconf);
9272                 return;
9273         }
9274
9275         chk->copy_by_ref = 0;
9276         chk->rec.chunk_id.id = SCTP_ASCONF;
9277         chk->rec.chunk_id.can_take_data = 0;
9278         chk->flags = CHUNK_FLAGS_FRAGMENT_OK;
9279         chk->data = m_asconf;
9280         chk->send_size = len;
9281         chk->sent = SCTP_DATAGRAM_UNSENT;
9282         chk->snd_count = 0;
9283         chk->asoc = &stcb->asoc;
9284         chk->whoTo = net;
9285         if (chk->whoTo) {
9286                 atomic_add_int(&chk->whoTo->ref_count, 1);
9287         }
9288         TAILQ_INSERT_TAIL(&chk->asoc->asconf_send_queue, chk, sctp_next);
9289         chk->asoc->ctrl_queue_cnt++;
9290         return;
9291 }
9292
9293 void
9294 sctp_send_asconf_ack(struct sctp_tcb *stcb)
9295 {
9296         /*
9297          * formulate and queue a asconf-ack back to sender. the asconf-ack
9298          * must be stored in the tcb.
9299          */
9300         struct sctp_tmit_chunk *chk;
9301         struct sctp_asconf_ack *ack, *latest_ack;
9302         struct mbuf *m_ack;
9303         struct sctp_nets *net = NULL;
9304
9305         SCTP_TCB_LOCK_ASSERT(stcb);
9306         /* Get the latest ASCONF-ACK */
9307         latest_ack = TAILQ_LAST(&stcb->asoc.asconf_ack_sent, sctp_asconf_ackhead);
9308         if (latest_ack == NULL) {
9309                 return;
9310         }
9311         if (latest_ack->last_sent_to != NULL &&
9312             latest_ack->last_sent_to == stcb->asoc.last_control_chunk_from) {
9313                 /* we're doing a retransmission */
9314                 net = sctp_find_alternate_net(stcb, stcb->asoc.last_control_chunk_from, 0);
9315                 if (net == NULL) {
9316                         /* no alternate */
9317                         if (stcb->asoc.last_control_chunk_from == NULL) {
9318                                 if (stcb->asoc.alternate) {
9319                                         net = stcb->asoc.alternate;
9320                                 } else {
9321                                         net = stcb->asoc.primary_destination;
9322                                 }
9323                         } else {
9324                                 net = stcb->asoc.last_control_chunk_from;
9325                         }
9326                 }
9327         } else {
9328                 /* normal case */
9329                 if (stcb->asoc.last_control_chunk_from == NULL) {
9330                         if (stcb->asoc.alternate) {
9331                                 net = stcb->asoc.alternate;
9332                         } else {
9333                                 net = stcb->asoc.primary_destination;
9334                         }
9335                 } else {
9336                         net = stcb->asoc.last_control_chunk_from;
9337                 }
9338         }
9339         latest_ack->last_sent_to = net;
9340
9341         TAILQ_FOREACH(ack, &stcb->asoc.asconf_ack_sent, next) {
9342                 if (ack->data == NULL) {
9343                         continue;
9344                 }
9345
9346                 /* copy the asconf_ack */
9347                 m_ack = SCTP_M_COPYM(ack->data, 0, M_COPYALL, M_NOWAIT);
9348                 if (m_ack == NULL) {
9349                         /* couldn't copy it */
9350                         return;
9351                 }
9352 #ifdef SCTP_MBUF_LOGGING
9353                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
9354                         sctp_log_mbc(m_ack, SCTP_MBUF_ICOPY);
9355                 }
9356 #endif
9357
9358                 sctp_alloc_a_chunk(stcb, chk);
9359                 if (chk == NULL) {
9360                         /* no memory */
9361                         if (m_ack)
9362                                 sctp_m_freem(m_ack);
9363                         return;
9364                 }
9365                 chk->copy_by_ref = 0;
9366                 chk->rec.chunk_id.id = SCTP_ASCONF_ACK;
9367                 chk->rec.chunk_id.can_take_data = 1;
9368                 chk->flags = CHUNK_FLAGS_FRAGMENT_OK;
9369                 chk->whoTo = net;
9370                 if (chk->whoTo) {
9371                         atomic_add_int(&chk->whoTo->ref_count, 1);
9372                 }
9373                 chk->data = m_ack;
9374                 chk->send_size = ack->len;
9375                 chk->sent = SCTP_DATAGRAM_UNSENT;
9376                 chk->snd_count = 0;
9377                 chk->asoc = &stcb->asoc;
9378
9379                 TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9380                 chk->asoc->ctrl_queue_cnt++;
9381         }
9382         return;
9383 }
9384
9385
9386 static int
9387 sctp_chunk_retransmission(struct sctp_inpcb *inp,
9388     struct sctp_tcb *stcb,
9389     struct sctp_association *asoc,
9390     int *cnt_out, struct timeval *now, int *now_filled, int *fr_done, int so_locked)
9391 {
9392         /*-
9393          * send out one MTU of retransmission. If fast_retransmit is
9394          * happening we ignore the cwnd. Otherwise we obey the cwnd and
9395          * rwnd. For a Cookie or Asconf in the control chunk queue we
9396          * retransmit them by themselves.
9397          *
9398          * For data chunks we will pick out the lowest TSN's in the sent_queue
9399          * marked for resend and bundle them all together (up to a MTU of
9400          * destination). The address to send to should have been
9401          * selected/changed where the retransmission was marked (i.e. in FR
9402          * or t3-timeout routines).
9403          */
9404         struct sctp_tmit_chunk *data_list[SCTP_MAX_DATA_BUNDLING];
9405         struct sctp_tmit_chunk *chk, *fwd;
9406         struct mbuf *m, *endofchain;
9407         struct sctp_nets *net = NULL;
9408         uint32_t tsns_sent = 0;
9409         int no_fragmentflg, bundle_at, cnt_thru;
9410         unsigned int mtu;
9411         int error, i, one_chunk, fwd_tsn, ctl_cnt, tmr_started;
9412         struct sctp_auth_chunk *auth = NULL;
9413         uint32_t auth_offset = 0;
9414         uint16_t auth_keyid;
9415         int override_ok = 1;
9416         int data_auth_reqd = 0;
9417         uint32_t dmtu = 0;
9418
9419         SCTP_TCB_LOCK_ASSERT(stcb);
9420         tmr_started = ctl_cnt = bundle_at = error = 0;
9421         no_fragmentflg = 1;
9422         fwd_tsn = 0;
9423         *cnt_out = 0;
9424         fwd = NULL;
9425         endofchain = m = NULL;
9426         auth_keyid = stcb->asoc.authinfo.active_keyid;
9427 #ifdef SCTP_AUDITING_ENABLED
9428         sctp_audit_log(0xC3, 1);
9429 #endif
9430         if ((TAILQ_EMPTY(&asoc->sent_queue)) &&
9431             (TAILQ_EMPTY(&asoc->control_send_queue))) {
9432                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "SCTP hits empty queue with cnt set to %d?\n",
9433                     asoc->sent_queue_retran_cnt);
9434                 asoc->sent_queue_cnt = 0;
9435                 asoc->sent_queue_cnt_removeable = 0;
9436                 /* send back 0/0 so we enter normal transmission */
9437                 *cnt_out = 0;
9438                 return (0);
9439         }
9440         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
9441                 if ((chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) ||
9442                     (chk->rec.chunk_id.id == SCTP_STREAM_RESET) ||
9443                     (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN)) {
9444                         if (chk->sent != SCTP_DATAGRAM_RESEND) {
9445                                 continue;
9446                         }
9447                         if (chk->rec.chunk_id.id == SCTP_STREAM_RESET) {
9448                                 if (chk != asoc->str_reset) {
9449                                         /*
9450                                          * not eligible for retran if its
9451                                          * not ours
9452                                          */
9453                                         continue;
9454                                 }
9455                         }
9456                         ctl_cnt++;
9457                         if (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN) {
9458                                 fwd_tsn = 1;
9459                         }
9460                         /*
9461                          * Add an AUTH chunk, if chunk requires it save the
9462                          * offset into the chain for AUTH
9463                          */
9464                         if ((auth == NULL) &&
9465                             (sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
9466                             stcb->asoc.peer_auth_chunks))) {
9467                                 m = sctp_add_auth_chunk(m, &endofchain,
9468                                     &auth, &auth_offset,
9469                                     stcb,
9470                                     chk->rec.chunk_id.id);
9471                                 SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
9472                         }
9473                         m = sctp_copy_mbufchain(chk->data, m, &endofchain, 0, chk->send_size, chk->copy_by_ref);
9474                         break;
9475                 }
9476         }
9477         one_chunk = 0;
9478         cnt_thru = 0;
9479         /* do we have control chunks to retransmit? */
9480         if (m != NULL) {
9481                 /* Start a timer no matter if we succeed or fail */
9482                 if (chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
9483                         sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, inp, stcb, chk->whoTo);
9484                 } else if (chk->rec.chunk_id.id == SCTP_ASCONF)
9485                         sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp, stcb, chk->whoTo);
9486                 chk->snd_count++;       /* update our count */
9487                 if ((error = sctp_lowlevel_chunk_output(inp, stcb, chk->whoTo,
9488                     (struct sockaddr *)&chk->whoTo->ro._l_addr, m,
9489                     auth_offset, auth, stcb->asoc.authinfo.active_keyid,
9490                     no_fragmentflg, 0, 0,
9491                     inp->sctp_lport, stcb->rport, htonl(stcb->asoc.peer_vtag),
9492                     chk->whoTo->port, NULL,
9493                     0, 0,
9494                     so_locked))) {
9495                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
9496                         if (error == ENOBUFS) {
9497                                 asoc->ifp_had_enobuf = 1;
9498                                 SCTP_STAT_INCR(sctps_lowlevelerr);
9499                         }
9500                         return (error);
9501                 } else {
9502                         asoc->ifp_had_enobuf = 0;
9503                 }
9504                 endofchain = NULL;
9505                 auth = NULL;
9506                 auth_offset = 0;
9507                 /*
9508                  * We don't want to mark the net->sent time here since this
9509                  * we use this for HB and retrans cannot measure RTT
9510                  */
9511                 /* (void)SCTP_GETTIME_TIMEVAL(&chk->whoTo->last_sent_time); */
9512                 *cnt_out += 1;
9513                 chk->sent = SCTP_DATAGRAM_SENT;
9514                 sctp_ucount_decr(stcb->asoc.sent_queue_retran_cnt);
9515                 if (fwd_tsn == 0) {
9516                         return (0);
9517                 } else {
9518                         /* Clean up the fwd-tsn list */
9519                         sctp_clean_up_ctl(stcb, asoc, so_locked);
9520                         return (0);
9521                 }
9522         }
9523         /*
9524          * Ok, it is just data retransmission we need to do or that and a
9525          * fwd-tsn with it all.
9526          */
9527         if (TAILQ_EMPTY(&asoc->sent_queue)) {
9528                 return (SCTP_RETRAN_DONE);
9529         }
9530         if ((SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED) ||
9531             (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_WAIT)) {
9532                 /* not yet open, resend the cookie and that is it */
9533                 return (1);
9534         }
9535 #ifdef SCTP_AUDITING_ENABLED
9536         sctp_auditing(20, inp, stcb, NULL);
9537 #endif
9538         data_auth_reqd = sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks);
9539         TAILQ_FOREACH(chk, &asoc->sent_queue, sctp_next) {
9540                 if (chk->sent != SCTP_DATAGRAM_RESEND) {
9541                         /* No, not sent to this net or not ready for rtx */
9542                         continue;
9543                 }
9544                 if (chk->data == NULL) {
9545                         SCTP_PRINTF("TSN:%x chk->snd_count:%d chk->sent:%d can't retran - no data\n",
9546                             chk->rec.data.tsn, chk->snd_count, chk->sent);
9547                         continue;
9548                 }
9549                 if ((SCTP_BASE_SYSCTL(sctp_max_retran_chunk)) &&
9550                     (chk->snd_count >= SCTP_BASE_SYSCTL(sctp_max_retran_chunk))) {
9551                         struct mbuf *op_err;
9552                         char msg[SCTP_DIAG_INFO_LEN];
9553
9554                         SCTP_SNPRINTF(msg, sizeof(msg), "TSN %8.8x retransmitted %d times, giving up",
9555                             chk->rec.data.tsn, chk->snd_count);
9556                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
9557                             msg);
9558                         atomic_add_int(&stcb->asoc.refcnt, 1);
9559                         sctp_abort_an_association(stcb->sctp_ep, stcb, op_err,
9560                             so_locked);
9561                         SCTP_TCB_LOCK(stcb);
9562                         atomic_subtract_int(&stcb->asoc.refcnt, 1);
9563                         return (SCTP_RETRAN_EXIT);
9564                 }
9565                 /* pick up the net */
9566                 net = chk->whoTo;
9567                 switch (net->ro._l_addr.sa.sa_family) {
9568 #ifdef INET
9569                 case AF_INET:
9570                         mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
9571                         break;
9572 #endif
9573 #ifdef INET6
9574                 case AF_INET6:
9575                         mtu = net->mtu - SCTP_MIN_OVERHEAD;
9576                         break;
9577 #endif
9578                 default:
9579                         /* TSNH */
9580                         mtu = net->mtu;
9581                         break;
9582                 }
9583
9584                 if ((asoc->peers_rwnd < mtu) && (asoc->total_flight > 0)) {
9585                         /* No room in peers rwnd */
9586                         uint32_t tsn;
9587
9588                         tsn = asoc->last_acked_seq + 1;
9589                         if (tsn == chk->rec.data.tsn) {
9590                                 /*
9591                                  * we make a special exception for this
9592                                  * case. The peer has no rwnd but is missing
9593                                  * the lowest chunk.. which is probably what
9594                                  * is holding up the rwnd.
9595                                  */
9596                                 goto one_chunk_around;
9597                         }
9598                         return (1);
9599                 }
9600 one_chunk_around:
9601                 if (asoc->peers_rwnd < mtu) {
9602                         one_chunk = 1;
9603                         if ((asoc->peers_rwnd == 0) &&
9604                             (asoc->total_flight == 0)) {
9605                                 chk->window_probe = 1;
9606                                 chk->whoTo->window_probe = 1;
9607                         }
9608                 }
9609 #ifdef SCTP_AUDITING_ENABLED
9610                 sctp_audit_log(0xC3, 2);
9611 #endif
9612                 bundle_at = 0;
9613                 m = NULL;
9614                 net->fast_retran_ip = 0;
9615                 if (chk->rec.data.doing_fast_retransmit == 0) {
9616                         /*
9617                          * if no FR in progress skip destination that have
9618                          * flight_size > cwnd.
9619                          */
9620                         if (net->flight_size >= net->cwnd) {
9621                                 continue;
9622                         }
9623                 } else {
9624                         /*
9625                          * Mark the destination net to have FR recovery
9626                          * limits put on it.
9627                          */
9628                         *fr_done = 1;
9629                         net->fast_retran_ip = 1;
9630                 }
9631
9632                 /*
9633                  * if no AUTH is yet included and this chunk requires it,
9634                  * make sure to account for it.  We don't apply the size
9635                  * until the AUTH chunk is actually added below in case
9636                  * there is no room for this chunk.
9637                  */
9638                 if (data_auth_reqd && (auth == NULL)) {
9639                         dmtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
9640                 } else
9641                         dmtu = 0;
9642
9643                 if ((chk->send_size <= (mtu - dmtu)) ||
9644                     (chk->flags & CHUNK_FLAGS_FRAGMENT_OK)) {
9645                         /* ok we will add this one */
9646                         if (data_auth_reqd) {
9647                                 if (auth == NULL) {
9648                                         m = sctp_add_auth_chunk(m,
9649                                             &endofchain,
9650                                             &auth,
9651                                             &auth_offset,
9652                                             stcb,
9653                                             SCTP_DATA);
9654                                         auth_keyid = chk->auth_keyid;
9655                                         override_ok = 0;
9656                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
9657                                 } else if (override_ok) {
9658                                         auth_keyid = chk->auth_keyid;
9659                                         override_ok = 0;
9660                                 } else if (chk->auth_keyid != auth_keyid) {
9661                                         /* different keyid, so done bundling */
9662                                         break;
9663                                 }
9664                         }
9665                         m = sctp_copy_mbufchain(chk->data, m, &endofchain, 0, chk->send_size, chk->copy_by_ref);
9666                         if (m == NULL) {
9667                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
9668                                 return (ENOMEM);
9669                         }
9670                         /* Do clear IP_DF ? */
9671                         if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
9672                                 no_fragmentflg = 0;
9673                         }
9674                         /* upate our MTU size */
9675                         if (mtu > (chk->send_size + dmtu))
9676                                 mtu -= (chk->send_size + dmtu);
9677                         else
9678                                 mtu = 0;
9679                         data_list[bundle_at++] = chk;
9680                         if (one_chunk && (asoc->total_flight <= 0)) {
9681                                 SCTP_STAT_INCR(sctps_windowprobed);
9682                         }
9683                 }
9684                 if (one_chunk == 0) {
9685                         /*
9686                          * now are there anymore forward from chk to pick
9687                          * up?
9688                          */
9689                         for (fwd = TAILQ_NEXT(chk, sctp_next); fwd != NULL; fwd = TAILQ_NEXT(fwd, sctp_next)) {
9690                                 if (fwd->sent != SCTP_DATAGRAM_RESEND) {
9691                                         /* Nope, not for retran */
9692                                         continue;
9693                                 }
9694                                 if (fwd->whoTo != net) {
9695                                         /* Nope, not the net in question */
9696                                         continue;
9697                                 }
9698                                 if (data_auth_reqd && (auth == NULL)) {
9699                                         dmtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
9700                                 } else
9701                                         dmtu = 0;
9702                                 if (fwd->send_size <= (mtu - dmtu)) {
9703                                         if (data_auth_reqd) {
9704                                                 if (auth == NULL) {
9705                                                         m = sctp_add_auth_chunk(m,
9706                                                             &endofchain,
9707                                                             &auth,
9708                                                             &auth_offset,
9709                                                             stcb,
9710                                                             SCTP_DATA);
9711                                                         auth_keyid = fwd->auth_keyid;
9712                                                         override_ok = 0;
9713                                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
9714                                                 } else if (override_ok) {
9715                                                         auth_keyid = fwd->auth_keyid;
9716                                                         override_ok = 0;
9717                                                 } else if (fwd->auth_keyid != auth_keyid) {
9718                                                         /*
9719                                                          * different keyid,
9720                                                          * so done bundling
9721                                                          */
9722                                                         break;
9723                                                 }
9724                                         }
9725                                         m = sctp_copy_mbufchain(fwd->data, m, &endofchain, 0, fwd->send_size, fwd->copy_by_ref);
9726                                         if (m == NULL) {
9727                                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
9728                                                 return (ENOMEM);
9729                                         }
9730                                         /* Do clear IP_DF ? */
9731                                         if (fwd->flags & CHUNK_FLAGS_FRAGMENT_OK) {
9732                                                 no_fragmentflg = 0;
9733                                         }
9734                                         /* upate our MTU size */
9735                                         if (mtu > (fwd->send_size + dmtu))
9736                                                 mtu -= (fwd->send_size + dmtu);
9737                                         else
9738                                                 mtu = 0;
9739                                         data_list[bundle_at++] = fwd;
9740                                         if (bundle_at >= SCTP_MAX_DATA_BUNDLING) {
9741                                                 break;
9742                                         }
9743                                 } else {
9744                                         /* can't fit so we are done */
9745                                         break;
9746                                 }
9747                         }
9748                 }
9749                 /* Is there something to send for this destination? */
9750                 if (m) {
9751                         /*
9752                          * No matter if we fail/or succeed we should start a
9753                          * timer. A failure is like a lost IP packet :-)
9754                          */
9755                         if (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
9756                                 /*
9757                                  * no timer running on this destination
9758                                  * restart it.
9759                                  */
9760                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
9761                                 tmr_started = 1;
9762                         }
9763                         /* Now lets send it, if there is anything to send :> */
9764                         if ((error = sctp_lowlevel_chunk_output(inp, stcb, net,
9765                             (struct sockaddr *)&net->ro._l_addr, m,
9766                             auth_offset, auth, auth_keyid,
9767                             no_fragmentflg, 0, 0,
9768                             inp->sctp_lport, stcb->rport, htonl(stcb->asoc.peer_vtag),
9769                             net->port, NULL,
9770                             0, 0,
9771                             so_locked))) {
9772                                 /* error, we could not output */
9773                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
9774                                 if (error == ENOBUFS) {
9775                                         asoc->ifp_had_enobuf = 1;
9776                                         SCTP_STAT_INCR(sctps_lowlevelerr);
9777                                 }
9778                                 return (error);
9779                         } else {
9780                                 asoc->ifp_had_enobuf = 0;
9781                         }
9782                         endofchain = NULL;
9783                         auth = NULL;
9784                         auth_offset = 0;
9785                         /* For HB's */
9786                         /*
9787                          * We don't want to mark the net->sent time here
9788                          * since this we use this for HB and retrans cannot
9789                          * measure RTT
9790                          */
9791                         /* (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time); */
9792
9793                         /* For auto-close */
9794                         cnt_thru++;
9795                         if (*now_filled == 0) {
9796                                 (void)SCTP_GETTIME_TIMEVAL(&asoc->time_last_sent);
9797                                 *now = asoc->time_last_sent;
9798                                 *now_filled = 1;
9799                         } else {
9800                                 asoc->time_last_sent = *now;
9801                         }
9802                         *cnt_out += bundle_at;
9803 #ifdef SCTP_AUDITING_ENABLED
9804                         sctp_audit_log(0xC4, bundle_at);
9805 #endif
9806                         if (bundle_at) {
9807                                 tsns_sent = data_list[0]->rec.data.tsn;
9808                         }
9809                         for (i = 0; i < bundle_at; i++) {
9810                                 SCTP_STAT_INCR(sctps_sendretransdata);
9811                                 data_list[i]->sent = SCTP_DATAGRAM_SENT;
9812                                 /*
9813                                  * When we have a revoked data, and we
9814                                  * retransmit it, then we clear the revoked
9815                                  * flag since this flag dictates if we
9816                                  * subtracted from the fs
9817                                  */
9818                                 if (data_list[i]->rec.data.chunk_was_revoked) {
9819                                         /* Deflate the cwnd */
9820                                         data_list[i]->whoTo->cwnd -= data_list[i]->book_size;
9821                                         data_list[i]->rec.data.chunk_was_revoked = 0;
9822                                 }
9823                                 data_list[i]->snd_count++;
9824                                 sctp_ucount_decr(asoc->sent_queue_retran_cnt);
9825                                 /* record the time */
9826                                 data_list[i]->sent_rcv_time = asoc->time_last_sent;
9827                                 if (data_list[i]->book_size_scale) {
9828                                         /*
9829                                          * need to double the book size on
9830                                          * this one
9831                                          */
9832                                         data_list[i]->book_size_scale = 0;
9833                                         /*
9834                                          * Since we double the booksize, we
9835                                          * must also double the output queue
9836                                          * size, since this get shrunk when
9837                                          * we free by this amount.
9838                                          */
9839                                         atomic_add_int(&((asoc)->total_output_queue_size), data_list[i]->book_size);
9840                                         data_list[i]->book_size *= 2;
9841
9842
9843                                 } else {
9844                                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_RWND_ENABLE) {
9845                                                 sctp_log_rwnd(SCTP_DECREASE_PEER_RWND,
9846                                                     asoc->peers_rwnd, data_list[i]->send_size, SCTP_BASE_SYSCTL(sctp_peer_chunk_oh));
9847                                         }
9848                                         asoc->peers_rwnd = sctp_sbspace_sub(asoc->peers_rwnd,
9849                                             (uint32_t)(data_list[i]->send_size +
9850                                             SCTP_BASE_SYSCTL(sctp_peer_chunk_oh)));
9851                                 }
9852                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
9853                                         sctp_misc_ints(SCTP_FLIGHT_LOG_UP_RSND,
9854                                             data_list[i]->whoTo->flight_size,
9855                                             data_list[i]->book_size,
9856                                             (uint32_t)(uintptr_t)data_list[i]->whoTo,
9857                                             data_list[i]->rec.data.tsn);
9858                                 }
9859                                 sctp_flight_size_increase(data_list[i]);
9860                                 sctp_total_flight_increase(stcb, data_list[i]);
9861                                 if (asoc->peers_rwnd < stcb->sctp_ep->sctp_ep.sctp_sws_sender) {
9862                                         /* SWS sender side engages */
9863                                         asoc->peers_rwnd = 0;
9864                                 }
9865                                 if ((i == 0) &&
9866                                     (data_list[i]->rec.data.doing_fast_retransmit)) {
9867                                         SCTP_STAT_INCR(sctps_sendfastretrans);
9868                                         if ((data_list[i] == TAILQ_FIRST(&asoc->sent_queue)) &&
9869                                             (tmr_started == 0)) {
9870                                                 /*-
9871                                                  * ok we just fast-retrans'd
9872                                                  * the lowest TSN, i.e the
9873                                                  * first on the list. In
9874                                                  * this case we want to give
9875                                                  * some more time to get a
9876                                                  * SACK back without a
9877                                                  * t3-expiring.
9878                                                  */
9879                                                 sctp_timer_stop(SCTP_TIMER_TYPE_SEND, inp, stcb, net,
9880                                                     SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_2);
9881                                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
9882                                         }
9883                                 }
9884                         }
9885                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
9886                                 sctp_log_cwnd(stcb, net, tsns_sent, SCTP_CWND_LOG_FROM_RESEND);
9887                         }
9888 #ifdef SCTP_AUDITING_ENABLED
9889                         sctp_auditing(21, inp, stcb, NULL);
9890 #endif
9891                 } else {
9892                         /* None will fit */
9893                         return (1);
9894                 }
9895                 if (asoc->sent_queue_retran_cnt <= 0) {
9896                         /* all done we have no more to retran */
9897                         asoc->sent_queue_retran_cnt = 0;
9898                         break;
9899                 }
9900                 if (one_chunk) {
9901                         /* No more room in rwnd */
9902                         return (1);
9903                 }
9904                 /* stop the for loop here. we sent out a packet */
9905                 break;
9906         }
9907         return (0);
9908 }
9909
9910 static void
9911 sctp_timer_validation(struct sctp_inpcb *inp,
9912     struct sctp_tcb *stcb,
9913     struct sctp_association *asoc)
9914 {
9915         struct sctp_nets *net;
9916
9917         /* Validate that a timer is running somewhere */
9918         TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
9919                 if (SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
9920                         /* Here is a timer */
9921                         return;
9922                 }
9923         }
9924         SCTP_TCB_LOCK_ASSERT(stcb);
9925         /* Gak, we did not have a timer somewhere */
9926         SCTPDBG(SCTP_DEBUG_OUTPUT3, "Deadlock avoided starting timer on a dest at retran\n");
9927         if (asoc->alternate) {
9928                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, asoc->alternate);
9929         } else {
9930                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, asoc->primary_destination);
9931         }
9932         return;
9933 }
9934
9935 void
9936 sctp_chunk_output(struct sctp_inpcb *inp,
9937     struct sctp_tcb *stcb,
9938     int from_where,
9939     int so_locked)
9940 {
9941         /*-
9942          * Ok this is the generic chunk service queue. we must do the
9943          * following:
9944          * - See if there are retransmits pending, if so we must
9945          *   do these first.
9946          * - Service the stream queue that is next, moving any
9947          *   message (note I must get a complete message i.e.
9948          *   FIRST/MIDDLE and LAST to the out queue in one pass) and assigning
9949          *   TSN's
9950          * - Check to see if the cwnd/rwnd allows any output, if so we
9951          *   go ahead and fomulate and send the low level chunks. Making sure
9952          *   to combine any control in the control chunk queue also.
9953          */
9954         struct sctp_association *asoc;
9955         struct sctp_nets *net;
9956         int error = 0, num_out, tot_out = 0, ret = 0, reason_code;
9957         unsigned int burst_cnt = 0;
9958         struct timeval now;
9959         int now_filled = 0;
9960         int nagle_on;
9961         int frag_point = sctp_get_frag_point(stcb, &stcb->asoc);
9962         int un_sent = 0;
9963         int fr_done;
9964         unsigned int tot_frs = 0;
9965
9966         asoc = &stcb->asoc;
9967 do_it_again:
9968         /* The Nagle algorithm is only applied when handling a send call. */
9969         if (from_where == SCTP_OUTPUT_FROM_USR_SEND) {
9970                 if (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_NODELAY)) {
9971                         nagle_on = 0;
9972                 } else {
9973                         nagle_on = 1;
9974                 }
9975         } else {
9976                 nagle_on = 0;
9977         }
9978         SCTP_TCB_LOCK_ASSERT(stcb);
9979
9980         un_sent = (stcb->asoc.total_output_queue_size - stcb->asoc.total_flight);
9981
9982         if ((un_sent <= 0) &&
9983             (TAILQ_EMPTY(&asoc->control_send_queue)) &&
9984             (TAILQ_EMPTY(&asoc->asconf_send_queue)) &&
9985             (asoc->sent_queue_retran_cnt == 0) &&
9986             (asoc->trigger_reset == 0)) {
9987                 /* Nothing to do unless there is something to be sent left */
9988                 return;
9989         }
9990         /*
9991          * Do we have something to send, data or control AND a sack timer
9992          * running, if so piggy-back the sack.
9993          */
9994         if (SCTP_OS_TIMER_PENDING(&stcb->asoc.dack_timer.timer)) {
9995                 sctp_send_sack(stcb, so_locked);
9996                 sctp_timer_stop(SCTP_TIMER_TYPE_RECV, stcb->sctp_ep, stcb, NULL,
9997                     SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_3);
9998         }
9999         while (asoc->sent_queue_retran_cnt) {
10000                 /*-
10001                  * Ok, it is retransmission time only, we send out only ONE
10002                  * packet with a single call off to the retran code.
10003                  */
10004                 if (from_where == SCTP_OUTPUT_FROM_COOKIE_ACK) {
10005                         /*-
10006                          * Special hook for handling cookiess discarded
10007                          * by peer that carried data. Send cookie-ack only
10008                          * and then the next call with get the retran's.
10009                          */
10010                         (void)sctp_med_chunk_output(inp, stcb, asoc, &num_out, &reason_code, 1,
10011                             from_where,
10012                             &now, &now_filled, frag_point, so_locked);
10013                         return;
10014                 } else if (from_where != SCTP_OUTPUT_FROM_HB_TMR) {
10015                         /* if its not from a HB then do it */
10016                         fr_done = 0;
10017                         ret = sctp_chunk_retransmission(inp, stcb, asoc, &num_out, &now, &now_filled, &fr_done, so_locked);
10018                         if (fr_done) {
10019                                 tot_frs++;
10020                         }
10021                 } else {
10022                         /*
10023                          * its from any other place, we don't allow retran
10024                          * output (only control)
10025                          */
10026                         ret = 1;
10027                 }
10028                 if (ret > 0) {
10029                         /* Can't send anymore */
10030                         /*-
10031                          * now lets push out control by calling med-level
10032                          * output once. this assures that we WILL send HB's
10033                          * if queued too.
10034                          */
10035                         (void)sctp_med_chunk_output(inp, stcb, asoc, &num_out, &reason_code, 1,
10036                             from_where,
10037                             &now, &now_filled, frag_point, so_locked);
10038 #ifdef SCTP_AUDITING_ENABLED
10039                         sctp_auditing(8, inp, stcb, NULL);
10040 #endif
10041                         sctp_timer_validation(inp, stcb, asoc);
10042                         return;
10043                 }
10044                 if (ret < 0) {
10045                         /*-
10046                          * The count was off.. retran is not happening so do
10047                          * the normal retransmission.
10048                          */
10049 #ifdef SCTP_AUDITING_ENABLED
10050                         sctp_auditing(9, inp, stcb, NULL);
10051 #endif
10052                         if (ret == SCTP_RETRAN_EXIT) {
10053                                 return;
10054                         }
10055                         break;
10056                 }
10057                 if (from_where == SCTP_OUTPUT_FROM_T3) {
10058                         /* Only one transmission allowed out of a timeout */
10059 #ifdef SCTP_AUDITING_ENABLED
10060                         sctp_auditing(10, inp, stcb, NULL);
10061 #endif
10062                         /* Push out any control */
10063                         (void)sctp_med_chunk_output(inp, stcb, asoc, &num_out, &reason_code, 1, from_where,
10064                             &now, &now_filled, frag_point, so_locked);
10065                         return;
10066                 }
10067                 if ((asoc->fr_max_burst > 0) && (tot_frs >= asoc->fr_max_burst)) {
10068                         /* Hit FR burst limit */
10069                         return;
10070                 }
10071                 if ((num_out == 0) && (ret == 0)) {
10072                         /* No more retrans to send */
10073                         break;
10074                 }
10075         }
10076 #ifdef SCTP_AUDITING_ENABLED
10077         sctp_auditing(12, inp, stcb, NULL);
10078 #endif
10079         /* Check for bad destinations, if they exist move chunks around. */
10080         TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
10081                 if (!(net->dest_state & SCTP_ADDR_REACHABLE)) {
10082                         /*-
10083                          * if possible move things off of this address we
10084                          * still may send below due to the dormant state but
10085                          * we try to find an alternate address to send to
10086                          * and if we have one we move all queued data on the
10087                          * out wheel to this alternate address.
10088                          */
10089                         if (net->ref_count > 1)
10090                                 sctp_move_chunks_from_net(stcb, net);
10091                 } else {
10092                         /*-
10093                          * if ((asoc->sat_network) || (net->addr_is_local))
10094                          * { burst_limit = asoc->max_burst *
10095                          * SCTP_SAT_NETWORK_BURST_INCR; }
10096                          */
10097                         if (asoc->max_burst > 0) {
10098                                 if (SCTP_BASE_SYSCTL(sctp_use_cwnd_based_maxburst)) {
10099                                         if ((net->flight_size + (asoc->max_burst * net->mtu)) < net->cwnd) {
10100                                                 /*
10101                                                  * JRS - Use the congestion
10102                                                  * control given in the
10103                                                  * congestion control module
10104                                                  */
10105                                                 asoc->cc_functions.sctp_cwnd_update_after_output(stcb, net, asoc->max_burst);
10106                                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_MAXBURST_ENABLE) {
10107                                                         sctp_log_maxburst(stcb, net, 0, asoc->max_burst, SCTP_MAX_BURST_APPLIED);
10108                                                 }
10109                                                 SCTP_STAT_INCR(sctps_maxburstqueued);
10110                                         }
10111                                         net->fast_retran_ip = 0;
10112                                 } else {
10113                                         if (net->flight_size == 0) {
10114                                                 /*
10115                                                  * Should be decaying the
10116                                                  * cwnd here
10117                                                  */
10118                                                 ;
10119                                         }
10120                                 }
10121                         }
10122                 }
10123
10124         }
10125         burst_cnt = 0;
10126         do {
10127                 error = sctp_med_chunk_output(inp, stcb, asoc, &num_out,
10128                     &reason_code, 0, from_where,
10129                     &now, &now_filled, frag_point, so_locked);
10130                 if (error) {
10131                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Error %d was returned from med-c-op\n", error);
10132                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_MAXBURST_ENABLE) {
10133                                 sctp_log_maxburst(stcb, asoc->primary_destination, error, burst_cnt, SCTP_MAX_BURST_ERROR_STOP);
10134                         }
10135                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
10136                                 sctp_log_cwnd(stcb, NULL, error, SCTP_SEND_NOW_COMPLETES);
10137                                 sctp_log_cwnd(stcb, NULL, 0xdeadbeef, SCTP_SEND_NOW_COMPLETES);
10138                         }
10139                         break;
10140                 }
10141                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "m-c-o put out %d\n", num_out);
10142
10143                 tot_out += num_out;
10144                 burst_cnt++;
10145                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
10146                         sctp_log_cwnd(stcb, NULL, num_out, SCTP_SEND_NOW_COMPLETES);
10147                         if (num_out == 0) {
10148                                 sctp_log_cwnd(stcb, NULL, reason_code, SCTP_SEND_NOW_COMPLETES);
10149                         }
10150                 }
10151                 if (nagle_on) {
10152                         /*
10153                          * When the Nagle algorithm is used, look at how
10154                          * much is unsent, then if its smaller than an MTU
10155                          * and we have data in flight we stop, except if we
10156                          * are handling a fragmented user message.
10157                          */
10158                         un_sent = stcb->asoc.total_output_queue_size - stcb->asoc.total_flight;
10159                         if ((un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD)) &&
10160                             (stcb->asoc.total_flight > 0)) {
10161 /*      &&                   sctp_is_feature_on(inp, SCTP_PCB_FLAGS_EXPLICIT_EOR))) {*/
10162                                 break;
10163                         }
10164                 }
10165                 if (TAILQ_EMPTY(&asoc->control_send_queue) &&
10166                     TAILQ_EMPTY(&asoc->send_queue) &&
10167                     sctp_is_there_unsent_data(stcb, so_locked) == 0) {
10168                         /* Nothing left to send */
10169                         break;
10170                 }
10171                 if ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) <= 0) {
10172                         /* Nothing left to send */
10173                         break;
10174                 }
10175         } while (num_out &&
10176             ((asoc->max_burst == 0) ||
10177             SCTP_BASE_SYSCTL(sctp_use_cwnd_based_maxburst) ||
10178             (burst_cnt < asoc->max_burst)));
10179
10180         if (SCTP_BASE_SYSCTL(sctp_use_cwnd_based_maxburst) == 0) {
10181                 if ((asoc->max_burst > 0) && (burst_cnt >= asoc->max_burst)) {
10182                         SCTP_STAT_INCR(sctps_maxburstqueued);
10183                         asoc->burst_limit_applied = 1;
10184                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_MAXBURST_ENABLE) {
10185                                 sctp_log_maxburst(stcb, asoc->primary_destination, 0, burst_cnt, SCTP_MAX_BURST_APPLIED);
10186                         }
10187                 } else {
10188                         asoc->burst_limit_applied = 0;
10189                 }
10190         }
10191         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
10192                 sctp_log_cwnd(stcb, NULL, tot_out, SCTP_SEND_NOW_COMPLETES);
10193         }
10194         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Ok, we have put out %d chunks\n",
10195             tot_out);
10196
10197         /*-
10198          * Now we need to clean up the control chunk chain if a ECNE is on
10199          * it. It must be marked as UNSENT again so next call will continue
10200          * to send it until such time that we get a CWR, to remove it.
10201          */
10202         if (stcb->asoc.ecn_echo_cnt_onq)
10203                 sctp_fix_ecn_echo(asoc);
10204
10205         if (stcb->asoc.trigger_reset) {
10206                 if (sctp_send_stream_reset_out_if_possible(stcb, so_locked) == 0) {
10207                         goto do_it_again;
10208                 }
10209         }
10210         return;
10211 }
10212
10213
10214 int
10215 sctp_output(
10216     struct sctp_inpcb *inp,
10217     struct mbuf *m,
10218     struct sockaddr *addr,
10219     struct mbuf *control,
10220     struct thread *p,
10221     int flags)
10222 {
10223         if (inp == NULL) {
10224                 SCTP_LTRACE_ERR_RET_PKT(m, inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
10225                 return (EINVAL);
10226         }
10227
10228         if (inp->sctp_socket == NULL) {
10229                 SCTP_LTRACE_ERR_RET_PKT(m, inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
10230                 return (EINVAL);
10231         }
10232         return (sctp_sosend(inp->sctp_socket,
10233             addr,
10234             (struct uio *)NULL,
10235             m,
10236             control,
10237             flags, p
10238             ));
10239 }
10240
10241 void
10242 send_forward_tsn(struct sctp_tcb *stcb,
10243     struct sctp_association *asoc)
10244 {
10245         struct sctp_tmit_chunk *chk, *at, *tp1, *last;
10246         struct sctp_forward_tsn_chunk *fwdtsn;
10247         struct sctp_strseq *strseq;
10248         struct sctp_strseq_mid *strseq_m;
10249         uint32_t advance_peer_ack_point;
10250         unsigned int cnt_of_space, i, ovh;
10251         unsigned int space_needed;
10252         unsigned int cnt_of_skipped = 0;
10253
10254         SCTP_TCB_LOCK_ASSERT(stcb);
10255         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
10256                 if (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN) {
10257                         /* mark it to unsent */
10258                         chk->sent = SCTP_DATAGRAM_UNSENT;
10259                         chk->snd_count = 0;
10260                         /* Do we correct its output location? */
10261                         if (chk->whoTo) {
10262                                 sctp_free_remote_addr(chk->whoTo);
10263                                 chk->whoTo = NULL;
10264                         }
10265                         goto sctp_fill_in_rest;
10266                 }
10267         }
10268         /* Ok if we reach here we must build one */
10269         sctp_alloc_a_chunk(stcb, chk);
10270         if (chk == NULL) {
10271                 return;
10272         }
10273         asoc->fwd_tsn_cnt++;
10274         chk->copy_by_ref = 0;
10275         /*
10276          * We don't do the old thing here since this is used not for on-wire
10277          * but to tell if we are sending a fwd-tsn by the stack during
10278          * output. And if its a IFORWARD or a FORWARD it is a fwd-tsn.
10279          */
10280         chk->rec.chunk_id.id = SCTP_FORWARD_CUM_TSN;
10281         chk->rec.chunk_id.can_take_data = 0;
10282         chk->flags = 0;
10283         chk->asoc = asoc;
10284         chk->whoTo = NULL;
10285         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
10286         if (chk->data == NULL) {
10287                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
10288                 return;
10289         }
10290         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
10291         chk->sent = SCTP_DATAGRAM_UNSENT;
10292         chk->snd_count = 0;
10293         TAILQ_INSERT_TAIL(&asoc->control_send_queue, chk, sctp_next);
10294         asoc->ctrl_queue_cnt++;
10295 sctp_fill_in_rest:
10296         /*-
10297          * Here we go through and fill out the part that deals with
10298          * stream/seq of the ones we skip.
10299          */
10300         SCTP_BUF_LEN(chk->data) = 0;
10301         TAILQ_FOREACH(at, &asoc->sent_queue, sctp_next) {
10302                 if ((at->sent != SCTP_FORWARD_TSN_SKIP) &&
10303                     (at->sent != SCTP_DATAGRAM_NR_ACKED)) {
10304                         /* no more to look at */
10305                         break;
10306                 }
10307                 if (!asoc->idata_supported && (at->rec.data.rcv_flags & SCTP_DATA_UNORDERED)) {
10308                         /* We don't report these */
10309                         continue;
10310                 }
10311                 cnt_of_skipped++;
10312         }
10313         if (asoc->idata_supported) {
10314                 space_needed = (sizeof(struct sctp_forward_tsn_chunk) +
10315                     (cnt_of_skipped * sizeof(struct sctp_strseq_mid)));
10316         } else {
10317                 space_needed = (sizeof(struct sctp_forward_tsn_chunk) +
10318                     (cnt_of_skipped * sizeof(struct sctp_strseq)));
10319         }
10320         cnt_of_space = (unsigned int)M_TRAILINGSPACE(chk->data);
10321
10322         if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
10323                 ovh = SCTP_MIN_OVERHEAD;
10324         } else {
10325                 ovh = SCTP_MIN_V4_OVERHEAD;
10326         }
10327         if (cnt_of_space > (asoc->smallest_mtu - ovh)) {
10328                 /* trim to a mtu size */
10329                 cnt_of_space = asoc->smallest_mtu - ovh;
10330         }
10331         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_TRY_ADVANCE) {
10332                 sctp_misc_ints(SCTP_FWD_TSN_CHECK,
10333                     0xff, 0, cnt_of_skipped,
10334                     asoc->advanced_peer_ack_point);
10335         }
10336         advance_peer_ack_point = asoc->advanced_peer_ack_point;
10337         if (cnt_of_space < space_needed) {
10338                 /*-
10339                  * ok we must trim down the chunk by lowering the
10340                  * advance peer ack point.
10341                  */
10342                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_TRY_ADVANCE) {
10343                         sctp_misc_ints(SCTP_FWD_TSN_CHECK,
10344                             0xff, 0xff, cnt_of_space,
10345                             space_needed);
10346                 }
10347                 cnt_of_skipped = cnt_of_space - sizeof(struct sctp_forward_tsn_chunk);
10348                 if (asoc->idata_supported) {
10349                         cnt_of_skipped /= sizeof(struct sctp_strseq_mid);
10350                 } else {
10351                         cnt_of_skipped /= sizeof(struct sctp_strseq);
10352                 }
10353                 /*-
10354                  * Go through and find the TSN that will be the one
10355                  * we report.
10356                  */
10357                 at = TAILQ_FIRST(&asoc->sent_queue);
10358                 if (at != NULL) {
10359                         for (i = 0; i < cnt_of_skipped; i++) {
10360                                 tp1 = TAILQ_NEXT(at, sctp_next);
10361                                 if (tp1 == NULL) {
10362                                         break;
10363                                 }
10364                                 at = tp1;
10365                         }
10366                 }
10367                 if (at && SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_TRY_ADVANCE) {
10368                         sctp_misc_ints(SCTP_FWD_TSN_CHECK,
10369                             0xff, cnt_of_skipped, at->rec.data.tsn,
10370                             asoc->advanced_peer_ack_point);
10371                 }
10372                 last = at;
10373                 /*-
10374                  * last now points to last one I can report, update
10375                  * peer ack point
10376                  */
10377                 if (last) {
10378                         advance_peer_ack_point = last->rec.data.tsn;
10379                 }
10380                 if (asoc->idata_supported) {
10381                         space_needed = sizeof(struct sctp_forward_tsn_chunk) +
10382                             cnt_of_skipped * sizeof(struct sctp_strseq_mid);
10383                 } else {
10384                         space_needed = sizeof(struct sctp_forward_tsn_chunk) +
10385                             cnt_of_skipped * sizeof(struct sctp_strseq);
10386                 }
10387         }
10388         chk->send_size = space_needed;
10389         /* Setup the chunk */
10390         fwdtsn = mtod(chk->data, struct sctp_forward_tsn_chunk *);
10391         fwdtsn->ch.chunk_length = htons(chk->send_size);
10392         fwdtsn->ch.chunk_flags = 0;
10393         if (asoc->idata_supported) {
10394                 fwdtsn->ch.chunk_type = SCTP_IFORWARD_CUM_TSN;
10395         } else {
10396                 fwdtsn->ch.chunk_type = SCTP_FORWARD_CUM_TSN;
10397         }
10398         fwdtsn->new_cumulative_tsn = htonl(advance_peer_ack_point);
10399         SCTP_BUF_LEN(chk->data) = chk->send_size;
10400         fwdtsn++;
10401         /*-
10402          * Move pointer to after the fwdtsn and transfer to the
10403          * strseq pointer.
10404          */
10405         if (asoc->idata_supported) {
10406                 strseq_m = (struct sctp_strseq_mid *)fwdtsn;
10407                 strseq = NULL;
10408         } else {
10409                 strseq = (struct sctp_strseq *)fwdtsn;
10410                 strseq_m = NULL;
10411         }
10412         /*-
10413          * Now populate the strseq list. This is done blindly
10414          * without pulling out duplicate stream info. This is
10415          * inefficent but won't harm the process since the peer will
10416          * look at these in sequence and will thus release anything.
10417          * It could mean we exceed the PMTU and chop off some that
10418          * we could have included.. but this is unlikely (aka 1432/4
10419          * would mean 300+ stream seq's would have to be reported in
10420          * one FWD-TSN. With a bit of work we can later FIX this to
10421          * optimize and pull out duplicates.. but it does add more
10422          * overhead. So for now... not!
10423          */
10424         i = 0;
10425         TAILQ_FOREACH(at, &asoc->sent_queue, sctp_next) {
10426                 if (i >= cnt_of_skipped) {
10427                         break;
10428                 }
10429                 if (!asoc->idata_supported && (at->rec.data.rcv_flags & SCTP_DATA_UNORDERED)) {
10430                         /* We don't report these */
10431                         continue;
10432                 }
10433                 if (at->rec.data.tsn == advance_peer_ack_point) {
10434                         at->rec.data.fwd_tsn_cnt = 0;
10435                 }
10436                 if (asoc->idata_supported) {
10437                         strseq_m->sid = htons(at->rec.data.sid);
10438                         if (at->rec.data.rcv_flags & SCTP_DATA_UNORDERED) {
10439                                 strseq_m->flags = htons(PR_SCTP_UNORDERED_FLAG);
10440                         } else {
10441                                 strseq_m->flags = 0;
10442                         }
10443                         strseq_m->mid = htonl(at->rec.data.mid);
10444                         strseq_m++;
10445                 } else {
10446                         strseq->sid = htons(at->rec.data.sid);
10447                         strseq->ssn = htons((uint16_t)at->rec.data.mid);
10448                         strseq++;
10449                 }
10450                 i++;
10451         }
10452         return;
10453 }
10454
10455 void
10456 sctp_send_sack(struct sctp_tcb *stcb, int so_locked)
10457 {
10458         /*-
10459          * Queue up a SACK or NR-SACK in the control queue.
10460          * We must first check to see if a SACK or NR-SACK is
10461          * somehow on the control queue.
10462          * If so, we will take and and remove the old one.
10463          */
10464         struct sctp_association *asoc;
10465         struct sctp_tmit_chunk *chk, *a_chk;
10466         struct sctp_sack_chunk *sack;
10467         struct sctp_nr_sack_chunk *nr_sack;
10468         struct sctp_gap_ack_block *gap_descriptor;
10469         const struct sack_track *selector;
10470         int mergeable = 0;
10471         int offset;
10472         caddr_t limit;
10473         uint32_t *dup;
10474         int limit_reached = 0;
10475         unsigned int i, siz, j;
10476         unsigned int num_gap_blocks = 0, num_nr_gap_blocks = 0, space;
10477         int num_dups = 0;
10478         int space_req;
10479         uint32_t highest_tsn;
10480         uint8_t flags;
10481         uint8_t type;
10482         uint8_t tsn_map;
10483
10484         if (stcb->asoc.nrsack_supported == 1) {
10485                 type = SCTP_NR_SELECTIVE_ACK;
10486         } else {
10487                 type = SCTP_SELECTIVE_ACK;
10488         }
10489         a_chk = NULL;
10490         asoc = &stcb->asoc;
10491         SCTP_TCB_LOCK_ASSERT(stcb);
10492         if (asoc->last_data_chunk_from == NULL) {
10493                 /* Hmm we never received anything */
10494                 return;
10495         }
10496         sctp_slide_mapping_arrays(stcb);
10497         sctp_set_rwnd(stcb, asoc);
10498         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
10499                 if (chk->rec.chunk_id.id == type) {
10500                         /* Hmm, found a sack already on queue, remove it */
10501                         TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
10502                         asoc->ctrl_queue_cnt--;
10503                         a_chk = chk;
10504                         if (a_chk->data) {
10505                                 sctp_m_freem(a_chk->data);
10506                                 a_chk->data = NULL;
10507                         }
10508                         if (a_chk->whoTo) {
10509                                 sctp_free_remote_addr(a_chk->whoTo);
10510                                 a_chk->whoTo = NULL;
10511                         }
10512                         break;
10513                 }
10514         }
10515         if (a_chk == NULL) {
10516                 sctp_alloc_a_chunk(stcb, a_chk);
10517                 if (a_chk == NULL) {
10518                         /* No memory so we drop the idea, and set a timer */
10519                         if (stcb->asoc.delayed_ack) {
10520                                 sctp_timer_stop(SCTP_TIMER_TYPE_RECV,
10521                                     stcb->sctp_ep, stcb, NULL,
10522                                     SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_4);
10523                                 sctp_timer_start(SCTP_TIMER_TYPE_RECV,
10524                                     stcb->sctp_ep, stcb, NULL);
10525                         } else {
10526                                 stcb->asoc.send_sack = 1;
10527                         }
10528                         return;
10529                 }
10530                 a_chk->copy_by_ref = 0;
10531                 a_chk->rec.chunk_id.id = type;
10532                 a_chk->rec.chunk_id.can_take_data = 1;
10533         }
10534         /* Clear our pkt counts */
10535         asoc->data_pkts_seen = 0;
10536
10537         a_chk->flags = 0;
10538         a_chk->asoc = asoc;
10539         a_chk->snd_count = 0;
10540         a_chk->send_size = 0;   /* fill in later */
10541         a_chk->sent = SCTP_DATAGRAM_UNSENT;
10542         a_chk->whoTo = NULL;
10543
10544         if (!(asoc->last_data_chunk_from->dest_state & SCTP_ADDR_REACHABLE)) {
10545                 /*-
10546                  * Ok, the destination for the SACK is unreachable, lets see if
10547                  * we can select an alternate to asoc->last_data_chunk_from
10548                  */
10549                 a_chk->whoTo = sctp_find_alternate_net(stcb, asoc->last_data_chunk_from, 0);
10550                 if (a_chk->whoTo == NULL) {
10551                         /* Nope, no alternate */
10552                         a_chk->whoTo = asoc->last_data_chunk_from;
10553                 }
10554         } else {
10555                 a_chk->whoTo = asoc->last_data_chunk_from;
10556         }
10557         if (a_chk->whoTo) {
10558                 atomic_add_int(&a_chk->whoTo->ref_count, 1);
10559         }
10560         if (SCTP_TSN_GT(asoc->highest_tsn_inside_map, asoc->highest_tsn_inside_nr_map)) {
10561                 highest_tsn = asoc->highest_tsn_inside_map;
10562         } else {
10563                 highest_tsn = asoc->highest_tsn_inside_nr_map;
10564         }
10565         if (highest_tsn == asoc->cumulative_tsn) {
10566                 /* no gaps */
10567                 if (type == SCTP_SELECTIVE_ACK) {
10568                         space_req = sizeof(struct sctp_sack_chunk);
10569                 } else {
10570                         space_req = sizeof(struct sctp_nr_sack_chunk);
10571                 }
10572         } else {
10573                 /* gaps get a cluster */
10574                 space_req = MCLBYTES;
10575         }
10576         /* Ok now lets formulate a MBUF with our sack */
10577         a_chk->data = sctp_get_mbuf_for_msg(space_req, 0, M_NOWAIT, 1, MT_DATA);
10578         if ((a_chk->data == NULL) ||
10579             (a_chk->whoTo == NULL)) {
10580                 /* rats, no mbuf memory */
10581                 if (a_chk->data) {
10582                         /* was a problem with the destination */
10583                         sctp_m_freem(a_chk->data);
10584                         a_chk->data = NULL;
10585                 }
10586                 sctp_free_a_chunk(stcb, a_chk, so_locked);
10587                 /* sa_ignore NO_NULL_CHK */
10588                 if (stcb->asoc.delayed_ack) {
10589                         sctp_timer_stop(SCTP_TIMER_TYPE_RECV,
10590                             stcb->sctp_ep, stcb, NULL,
10591                             SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_5);
10592                         sctp_timer_start(SCTP_TIMER_TYPE_RECV,
10593                             stcb->sctp_ep, stcb, NULL);
10594                 } else {
10595                         stcb->asoc.send_sack = 1;
10596                 }
10597                 return;
10598         }
10599         /* ok, lets go through and fill it in */
10600         SCTP_BUF_RESV_UF(a_chk->data, SCTP_MIN_OVERHEAD);
10601         space = (unsigned int)M_TRAILINGSPACE(a_chk->data);
10602         if (space > (a_chk->whoTo->mtu - SCTP_MIN_OVERHEAD)) {
10603                 space = (a_chk->whoTo->mtu - SCTP_MIN_OVERHEAD);
10604         }
10605         limit = mtod(a_chk->data, caddr_t);
10606         limit += space;
10607
10608         flags = 0;
10609
10610         if ((asoc->sctp_cmt_on_off > 0) &&
10611             SCTP_BASE_SYSCTL(sctp_cmt_use_dac)) {
10612                 /*-
10613                  * CMT DAC algorithm: If 2 (i.e., 0x10) packets have been
10614                  * received, then set high bit to 1, else 0. Reset
10615                  * pkts_rcvd.
10616                  */
10617                 flags |= (asoc->cmt_dac_pkts_rcvd << 6);
10618                 asoc->cmt_dac_pkts_rcvd = 0;
10619         }
10620 #ifdef SCTP_ASOCLOG_OF_TSNS
10621         stcb->asoc.cumack_logsnt[stcb->asoc.cumack_log_atsnt] = asoc->cumulative_tsn;
10622         stcb->asoc.cumack_log_atsnt++;
10623         if (stcb->asoc.cumack_log_atsnt >= SCTP_TSN_LOG_SIZE) {
10624                 stcb->asoc.cumack_log_atsnt = 0;
10625         }
10626 #endif
10627         /* reset the readers interpretation */
10628         stcb->freed_by_sorcv_sincelast = 0;
10629
10630         if (type == SCTP_SELECTIVE_ACK) {
10631                 sack = mtod(a_chk->data, struct sctp_sack_chunk *);
10632                 nr_sack = NULL;
10633                 gap_descriptor = (struct sctp_gap_ack_block *)((caddr_t)sack + sizeof(struct sctp_sack_chunk));
10634                 if (highest_tsn > asoc->mapping_array_base_tsn) {
10635                         siz = (((highest_tsn - asoc->mapping_array_base_tsn) + 1) + 7) / 8;
10636                 } else {
10637                         siz = (((MAX_TSN - asoc->mapping_array_base_tsn) + 1) + highest_tsn + 7) / 8;
10638                 }
10639         } else {
10640                 sack = NULL;
10641                 nr_sack = mtod(a_chk->data, struct sctp_nr_sack_chunk *);
10642                 gap_descriptor = (struct sctp_gap_ack_block *)((caddr_t)nr_sack + sizeof(struct sctp_nr_sack_chunk));
10643                 if (asoc->highest_tsn_inside_map > asoc->mapping_array_base_tsn) {
10644                         siz = (((asoc->highest_tsn_inside_map - asoc->mapping_array_base_tsn) + 1) + 7) / 8;
10645                 } else {
10646                         siz = (((MAX_TSN - asoc->mapping_array_base_tsn) + 1) + asoc->highest_tsn_inside_map + 7) / 8;
10647                 }
10648         }
10649
10650         if (SCTP_TSN_GT(asoc->mapping_array_base_tsn, asoc->cumulative_tsn)) {
10651                 offset = 1;
10652         } else {
10653                 offset = asoc->mapping_array_base_tsn - asoc->cumulative_tsn;
10654         }
10655         if (((type == SCTP_SELECTIVE_ACK) &&
10656             SCTP_TSN_GT(highest_tsn, asoc->cumulative_tsn)) ||
10657             ((type == SCTP_NR_SELECTIVE_ACK) &&
10658             SCTP_TSN_GT(asoc->highest_tsn_inside_map, asoc->cumulative_tsn))) {
10659                 /* we have a gap .. maybe */
10660                 for (i = 0; i < siz; i++) {
10661                         tsn_map = asoc->mapping_array[i];
10662                         if (type == SCTP_SELECTIVE_ACK) {
10663                                 tsn_map |= asoc->nr_mapping_array[i];
10664                         }
10665                         if (i == 0) {
10666                                 /*
10667                                  * Clear all bits corresponding to TSNs
10668                                  * smaller or equal to the cumulative TSN.
10669                                  */
10670                                 tsn_map &= (~0U << (1 - offset));
10671                         }
10672                         selector = &sack_array[tsn_map];
10673                         if (mergeable && selector->right_edge) {
10674                                 /*
10675                                  * Backup, left and right edges were ok to
10676                                  * merge.
10677                                  */
10678                                 num_gap_blocks--;
10679                                 gap_descriptor--;
10680                         }
10681                         if (selector->num_entries == 0)
10682                                 mergeable = 0;
10683                         else {
10684                                 for (j = 0; j < selector->num_entries; j++) {
10685                                         if (mergeable && selector->right_edge) {
10686                                                 /*
10687                                                  * do a merge by NOT setting
10688                                                  * the left side
10689                                                  */
10690                                                 mergeable = 0;
10691                                         } else {
10692                                                 /*
10693                                                  * no merge, set the left
10694                                                  * side
10695                                                  */
10696                                                 mergeable = 0;
10697                                                 gap_descriptor->start = htons((selector->gaps[j].start + offset));
10698                                         }
10699                                         gap_descriptor->end = htons((selector->gaps[j].end + offset));
10700                                         num_gap_blocks++;
10701                                         gap_descriptor++;
10702                                         if (((caddr_t)gap_descriptor + sizeof(struct sctp_gap_ack_block)) > limit) {
10703                                                 /* no more room */
10704                                                 limit_reached = 1;
10705                                                 break;
10706                                         }
10707                                 }
10708                                 if (selector->left_edge) {
10709                                         mergeable = 1;
10710                                 }
10711                         }
10712                         if (limit_reached) {
10713                                 /* Reached the limit stop */
10714                                 break;
10715                         }
10716                         offset += 8;
10717                 }
10718         }
10719         if ((type == SCTP_NR_SELECTIVE_ACK) &&
10720             (limit_reached == 0)) {
10721
10722                 mergeable = 0;
10723
10724                 if (asoc->highest_tsn_inside_nr_map > asoc->mapping_array_base_tsn) {
10725                         siz = (((asoc->highest_tsn_inside_nr_map - asoc->mapping_array_base_tsn) + 1) + 7) / 8;
10726                 } else {
10727                         siz = (((MAX_TSN - asoc->mapping_array_base_tsn) + 1) + asoc->highest_tsn_inside_nr_map + 7) / 8;
10728                 }
10729
10730                 if (SCTP_TSN_GT(asoc->mapping_array_base_tsn, asoc->cumulative_tsn)) {
10731                         offset = 1;
10732                 } else {
10733                         offset = asoc->mapping_array_base_tsn - asoc->cumulative_tsn;
10734                 }
10735                 if (SCTP_TSN_GT(asoc->highest_tsn_inside_nr_map, asoc->cumulative_tsn)) {
10736                         /* we have a gap .. maybe */
10737                         for (i = 0; i < siz; i++) {
10738                                 tsn_map = asoc->nr_mapping_array[i];
10739                                 if (i == 0) {
10740                                         /*
10741                                          * Clear all bits corresponding to
10742                                          * TSNs smaller or equal to the
10743                                          * cumulative TSN.
10744                                          */
10745                                         tsn_map &= (~0U << (1 - offset));
10746                                 }
10747                                 selector = &sack_array[tsn_map];
10748                                 if (mergeable && selector->right_edge) {
10749                                         /*
10750                                          * Backup, left and right edges were
10751                                          * ok to merge.
10752                                          */
10753                                         num_nr_gap_blocks--;
10754                                         gap_descriptor--;
10755                                 }
10756                                 if (selector->num_entries == 0)
10757                                         mergeable = 0;
10758                                 else {
10759                                         for (j = 0; j < selector->num_entries; j++) {
10760                                                 if (mergeable && selector->right_edge) {
10761                                                         /*
10762                                                          * do a merge by NOT
10763                                                          * setting the left
10764                                                          * side
10765                                                          */
10766                                                         mergeable = 0;
10767                                                 } else {
10768                                                         /*
10769                                                          * no merge, set the
10770                                                          * left side
10771                                                          */
10772                                                         mergeable = 0;
10773                                                         gap_descriptor->start = htons((selector->gaps[j].start + offset));
10774                                                 }
10775                                                 gap_descriptor->end = htons((selector->gaps[j].end + offset));
10776                                                 num_nr_gap_blocks++;
10777                                                 gap_descriptor++;
10778                                                 if (((caddr_t)gap_descriptor + sizeof(struct sctp_gap_ack_block)) > limit) {
10779                                                         /* no more room */
10780                                                         limit_reached = 1;
10781                                                         break;
10782                                                 }
10783                                         }
10784                                         if (selector->left_edge) {
10785                                                 mergeable = 1;
10786                                         }
10787                                 }
10788                                 if (limit_reached) {
10789                                         /* Reached the limit stop */
10790                                         break;
10791                                 }
10792                                 offset += 8;
10793                         }
10794                 }
10795         }
10796         /* now we must add any dups we are going to report. */
10797         if ((limit_reached == 0) && (asoc->numduptsns)) {
10798                 dup = (uint32_t *)gap_descriptor;
10799                 for (i = 0; i < asoc->numduptsns; i++) {
10800                         *dup = htonl(asoc->dup_tsns[i]);
10801                         dup++;
10802                         num_dups++;
10803                         if (((caddr_t)dup + sizeof(uint32_t)) > limit) {
10804                                 /* no more room */
10805                                 break;
10806                         }
10807                 }
10808                 asoc->numduptsns = 0;
10809         }
10810         /*
10811          * now that the chunk is prepared queue it to the control chunk
10812          * queue.
10813          */
10814         if (type == SCTP_SELECTIVE_ACK) {
10815                 a_chk->send_size = (uint16_t)(sizeof(struct sctp_sack_chunk) +
10816                     (num_gap_blocks + num_nr_gap_blocks) * sizeof(struct sctp_gap_ack_block) +
10817                     num_dups * sizeof(int32_t));
10818                 SCTP_BUF_LEN(a_chk->data) = a_chk->send_size;
10819                 sack->sack.cum_tsn_ack = htonl(asoc->cumulative_tsn);
10820                 sack->sack.a_rwnd = htonl(asoc->my_rwnd);
10821                 sack->sack.num_gap_ack_blks = htons(num_gap_blocks);
10822                 sack->sack.num_dup_tsns = htons(num_dups);
10823                 sack->ch.chunk_type = type;
10824                 sack->ch.chunk_flags = flags;
10825                 sack->ch.chunk_length = htons(a_chk->send_size);
10826         } else {
10827                 a_chk->send_size = (uint16_t)(sizeof(struct sctp_nr_sack_chunk) +
10828                     (num_gap_blocks + num_nr_gap_blocks) * sizeof(struct sctp_gap_ack_block) +
10829                     num_dups * sizeof(int32_t));
10830                 SCTP_BUF_LEN(a_chk->data) = a_chk->send_size;
10831                 nr_sack->nr_sack.cum_tsn_ack = htonl(asoc->cumulative_tsn);
10832                 nr_sack->nr_sack.a_rwnd = htonl(asoc->my_rwnd);
10833                 nr_sack->nr_sack.num_gap_ack_blks = htons(num_gap_blocks);
10834                 nr_sack->nr_sack.num_nr_gap_ack_blks = htons(num_nr_gap_blocks);
10835                 nr_sack->nr_sack.num_dup_tsns = htons(num_dups);
10836                 nr_sack->nr_sack.reserved = 0;
10837                 nr_sack->ch.chunk_type = type;
10838                 nr_sack->ch.chunk_flags = flags;
10839                 nr_sack->ch.chunk_length = htons(a_chk->send_size);
10840         }
10841         TAILQ_INSERT_TAIL(&asoc->control_send_queue, a_chk, sctp_next);
10842         asoc->my_last_reported_rwnd = asoc->my_rwnd;
10843         asoc->ctrl_queue_cnt++;
10844         asoc->send_sack = 0;
10845         SCTP_STAT_INCR(sctps_sendsacks);
10846         return;
10847 }
10848
10849 void
10850 sctp_send_abort_tcb(struct sctp_tcb *stcb, struct mbuf *operr, int so_locked)
10851 {
10852         struct mbuf *m_abort, *m, *m_last;
10853         struct mbuf *m_out, *m_end = NULL;
10854         struct sctp_abort_chunk *abort;
10855         struct sctp_auth_chunk *auth = NULL;
10856         struct sctp_nets *net;
10857         uint32_t vtag;
10858         uint32_t auth_offset = 0;
10859         int error;
10860         uint16_t cause_len, chunk_len, padding_len;
10861
10862         SCTP_TCB_LOCK_ASSERT(stcb);
10863         /*-
10864          * Add an AUTH chunk, if chunk requires it and save the offset into
10865          * the chain for AUTH
10866          */
10867         if (sctp_auth_is_required_chunk(SCTP_ABORT_ASSOCIATION,
10868             stcb->asoc.peer_auth_chunks)) {
10869                 m_out = sctp_add_auth_chunk(NULL, &m_end, &auth, &auth_offset,
10870                     stcb, SCTP_ABORT_ASSOCIATION);
10871                 SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
10872         } else {
10873                 m_out = NULL;
10874         }
10875         m_abort = sctp_get_mbuf_for_msg(sizeof(struct sctp_abort_chunk), 0, M_NOWAIT, 1, MT_HEADER);
10876         if (m_abort == NULL) {
10877                 if (m_out) {
10878                         sctp_m_freem(m_out);
10879                 }
10880                 if (operr) {
10881                         sctp_m_freem(operr);
10882                 }
10883                 return;
10884         }
10885         /* link in any error */
10886         SCTP_BUF_NEXT(m_abort) = operr;
10887         cause_len = 0;
10888         m_last = NULL;
10889         for (m = operr; m; m = SCTP_BUF_NEXT(m)) {
10890                 cause_len += (uint16_t)SCTP_BUF_LEN(m);
10891                 if (SCTP_BUF_NEXT(m) == NULL) {
10892                         m_last = m;
10893                 }
10894         }
10895         SCTP_BUF_LEN(m_abort) = sizeof(struct sctp_abort_chunk);
10896         chunk_len = (uint16_t)sizeof(struct sctp_abort_chunk) + cause_len;
10897         padding_len = SCTP_SIZE32(chunk_len) - chunk_len;
10898         if (m_out == NULL) {
10899                 /* NO Auth chunk prepended, so reserve space in front */
10900                 SCTP_BUF_RESV_UF(m_abort, SCTP_MIN_OVERHEAD);
10901                 m_out = m_abort;
10902         } else {
10903                 /* Put AUTH chunk at the front of the chain */
10904                 SCTP_BUF_NEXT(m_end) = m_abort;
10905         }
10906         if (stcb->asoc.alternate) {
10907                 net = stcb->asoc.alternate;
10908         } else {
10909                 net = stcb->asoc.primary_destination;
10910         }
10911         /* Fill in the ABORT chunk header. */
10912         abort = mtod(m_abort, struct sctp_abort_chunk *);
10913         abort->ch.chunk_type = SCTP_ABORT_ASSOCIATION;
10914         if (stcb->asoc.peer_vtag == 0) {
10915                 /* This happens iff the assoc is in COOKIE-WAIT state. */
10916                 vtag = stcb->asoc.my_vtag;
10917                 abort->ch.chunk_flags = SCTP_HAD_NO_TCB;
10918         } else {
10919                 vtag = stcb->asoc.peer_vtag;
10920                 abort->ch.chunk_flags = 0;
10921         }
10922         abort->ch.chunk_length = htons(chunk_len);
10923         /* Add padding, if necessary. */
10924         if (padding_len > 0) {
10925                 if ((m_last == NULL) ||
10926                     (sctp_add_pad_tombuf(m_last, padding_len) == NULL)) {
10927                         sctp_m_freem(m_out);
10928                         return;
10929                 }
10930         }
10931         if ((error = sctp_lowlevel_chunk_output(stcb->sctp_ep, stcb, net,
10932             (struct sockaddr *)&net->ro._l_addr,
10933             m_out, auth_offset, auth, stcb->asoc.authinfo.active_keyid, 1, 0, 0,
10934             stcb->sctp_ep->sctp_lport, stcb->rport, htonl(vtag),
10935             stcb->asoc.primary_destination->port, NULL,
10936             0, 0,
10937             so_locked))) {
10938                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
10939                 if (error == ENOBUFS) {
10940                         stcb->asoc.ifp_had_enobuf = 1;
10941                         SCTP_STAT_INCR(sctps_lowlevelerr);
10942                 }
10943         } else {
10944                 stcb->asoc.ifp_had_enobuf = 0;
10945         }
10946         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
10947 }
10948
10949 void
10950 sctp_send_shutdown_complete(struct sctp_tcb *stcb,
10951     struct sctp_nets *net,
10952     int reflect_vtag)
10953 {
10954         /* formulate and SEND a SHUTDOWN-COMPLETE */
10955         struct mbuf *m_shutdown_comp;
10956         struct sctp_shutdown_complete_chunk *shutdown_complete;
10957         uint32_t vtag;
10958         int error;
10959         uint8_t flags;
10960
10961         m_shutdown_comp = sctp_get_mbuf_for_msg(sizeof(struct sctp_chunkhdr), 0, M_NOWAIT, 1, MT_HEADER);
10962         if (m_shutdown_comp == NULL) {
10963                 /* no mbuf's */
10964                 return;
10965         }
10966         if (reflect_vtag) {
10967                 flags = SCTP_HAD_NO_TCB;
10968                 vtag = stcb->asoc.my_vtag;
10969         } else {
10970                 flags = 0;
10971                 vtag = stcb->asoc.peer_vtag;
10972         }
10973         shutdown_complete = mtod(m_shutdown_comp, struct sctp_shutdown_complete_chunk *);
10974         shutdown_complete->ch.chunk_type = SCTP_SHUTDOWN_COMPLETE;
10975         shutdown_complete->ch.chunk_flags = flags;
10976         shutdown_complete->ch.chunk_length = htons(sizeof(struct sctp_shutdown_complete_chunk));
10977         SCTP_BUF_LEN(m_shutdown_comp) = sizeof(struct sctp_shutdown_complete_chunk);
10978         if ((error = sctp_lowlevel_chunk_output(stcb->sctp_ep, stcb, net,
10979             (struct sockaddr *)&net->ro._l_addr,
10980             m_shutdown_comp, 0, NULL, 0, 1, 0, 0,
10981             stcb->sctp_ep->sctp_lport, stcb->rport,
10982             htonl(vtag),
10983             net->port, NULL,
10984             0, 0,
10985             SCTP_SO_NOT_LOCKED))) {
10986                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
10987                 if (error == ENOBUFS) {
10988                         stcb->asoc.ifp_had_enobuf = 1;
10989                         SCTP_STAT_INCR(sctps_lowlevelerr);
10990                 }
10991         } else {
10992                 stcb->asoc.ifp_had_enobuf = 0;
10993         }
10994         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
10995         return;
10996 }
10997
10998 static void
10999 sctp_send_resp_msg(struct sockaddr *src, struct sockaddr *dst,
11000     struct sctphdr *sh, uint32_t vtag,
11001     uint8_t type, struct mbuf *cause,
11002     uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum,
11003     uint32_t vrf_id, uint16_t port)
11004 {
11005         struct mbuf *o_pak;
11006         struct mbuf *mout;
11007         struct sctphdr *shout;
11008         struct sctp_chunkhdr *ch;
11009 #if defined(INET) || defined(INET6)
11010         struct udphdr *udp;
11011 #endif
11012         int ret, len, cause_len, padding_len;
11013 #ifdef INET
11014         struct sockaddr_in *src_sin, *dst_sin;
11015         struct ip *ip;
11016 #endif
11017 #ifdef INET6
11018         struct sockaddr_in6 *src_sin6, *dst_sin6;
11019         struct ip6_hdr *ip6;
11020 #endif
11021
11022         /* Compute the length of the cause and add final padding. */
11023         cause_len = 0;
11024         if (cause != NULL) {
11025                 struct mbuf *m_at, *m_last = NULL;
11026
11027                 for (m_at = cause; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
11028                         if (SCTP_BUF_NEXT(m_at) == NULL)
11029                                 m_last = m_at;
11030                         cause_len += SCTP_BUF_LEN(m_at);
11031                 }
11032                 padding_len = cause_len % 4;
11033                 if (padding_len != 0) {
11034                         padding_len = 4 - padding_len;
11035                 }
11036                 if (padding_len != 0) {
11037                         if (sctp_add_pad_tombuf(m_last, padding_len) == NULL) {
11038                                 sctp_m_freem(cause);
11039                                 return;
11040                         }
11041                 }
11042         } else {
11043                 padding_len = 0;
11044         }
11045         /* Get an mbuf for the header. */
11046         len = sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
11047         switch (dst->sa_family) {
11048 #ifdef INET
11049         case AF_INET:
11050                 len += sizeof(struct ip);
11051                 break;
11052 #endif
11053 #ifdef INET6
11054         case AF_INET6:
11055                 len += sizeof(struct ip6_hdr);
11056                 break;
11057 #endif
11058         default:
11059                 break;
11060         }
11061 #if defined(INET) || defined(INET6)
11062         if (port) {
11063                 len += sizeof(struct udphdr);
11064         }
11065 #endif
11066         mout = sctp_get_mbuf_for_msg(len + max_linkhdr, 1, M_NOWAIT, 1, MT_DATA);
11067         if (mout == NULL) {
11068                 if (cause) {
11069                         sctp_m_freem(cause);
11070                 }
11071                 return;
11072         }
11073         SCTP_BUF_RESV_UF(mout, max_linkhdr);
11074         SCTP_BUF_LEN(mout) = len;
11075         SCTP_BUF_NEXT(mout) = cause;
11076         M_SETFIB(mout, fibnum);
11077         mout->m_pkthdr.flowid = mflowid;
11078         M_HASHTYPE_SET(mout, mflowtype);
11079 #ifdef INET
11080         ip = NULL;
11081 #endif
11082 #ifdef INET6
11083         ip6 = NULL;
11084 #endif
11085         switch (dst->sa_family) {
11086 #ifdef INET
11087         case AF_INET:
11088                 src_sin = (struct sockaddr_in *)src;
11089                 dst_sin = (struct sockaddr_in *)dst;
11090                 ip = mtod(mout, struct ip *);
11091                 ip->ip_v = IPVERSION;
11092                 ip->ip_hl = (sizeof(struct ip) >> 2);
11093                 ip->ip_tos = 0;
11094                 ip->ip_off = htons(IP_DF);
11095                 ip_fillid(ip);
11096                 ip->ip_ttl = MODULE_GLOBAL(ip_defttl);
11097                 if (port) {
11098                         ip->ip_p = IPPROTO_UDP;
11099                 } else {
11100                         ip->ip_p = IPPROTO_SCTP;
11101                 }
11102                 ip->ip_src.s_addr = dst_sin->sin_addr.s_addr;
11103                 ip->ip_dst.s_addr = src_sin->sin_addr.s_addr;
11104                 ip->ip_sum = 0;
11105                 len = sizeof(struct ip);
11106                 shout = (struct sctphdr *)((caddr_t)ip + len);
11107                 break;
11108 #endif
11109 #ifdef INET6
11110         case AF_INET6:
11111                 src_sin6 = (struct sockaddr_in6 *)src;
11112                 dst_sin6 = (struct sockaddr_in6 *)dst;
11113                 ip6 = mtod(mout, struct ip6_hdr *);
11114                 ip6->ip6_flow = htonl(0x60000000);
11115                 if (V_ip6_auto_flowlabel) {
11116                         ip6->ip6_flow |= (htonl(ip6_randomflowlabel()) & IPV6_FLOWLABEL_MASK);
11117                 }
11118                 ip6->ip6_hlim = MODULE_GLOBAL(ip6_defhlim);
11119                 if (port) {
11120                         ip6->ip6_nxt = IPPROTO_UDP;
11121                 } else {
11122                         ip6->ip6_nxt = IPPROTO_SCTP;
11123                 }
11124                 ip6->ip6_src = dst_sin6->sin6_addr;
11125                 ip6->ip6_dst = src_sin6->sin6_addr;
11126                 len = sizeof(struct ip6_hdr);
11127                 shout = (struct sctphdr *)((caddr_t)ip6 + len);
11128                 break;
11129 #endif
11130         default:
11131                 len = 0;
11132                 shout = mtod(mout, struct sctphdr *);
11133                 break;
11134         }
11135 #if defined(INET) || defined(INET6)
11136         if (port) {
11137                 if (htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port)) == 0) {
11138                         sctp_m_freem(mout);
11139                         return;
11140                 }
11141                 udp = (struct udphdr *)shout;
11142                 udp->uh_sport = htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port));
11143                 udp->uh_dport = port;
11144                 udp->uh_sum = 0;
11145                 udp->uh_ulen = htons((uint16_t)(sizeof(struct udphdr) +
11146                     sizeof(struct sctphdr) +
11147                     sizeof(struct sctp_chunkhdr) +
11148                     cause_len + padding_len));
11149                 len += sizeof(struct udphdr);
11150                 shout = (struct sctphdr *)((caddr_t)shout + sizeof(struct udphdr));
11151         } else {
11152                 udp = NULL;
11153         }
11154 #endif
11155         shout->src_port = sh->dest_port;
11156         shout->dest_port = sh->src_port;
11157         shout->checksum = 0;
11158         if (vtag) {
11159                 shout->v_tag = htonl(vtag);
11160         } else {
11161                 shout->v_tag = sh->v_tag;
11162         }
11163         len += sizeof(struct sctphdr);
11164         ch = (struct sctp_chunkhdr *)((caddr_t)shout + sizeof(struct sctphdr));
11165         ch->chunk_type = type;
11166         if (vtag) {
11167                 ch->chunk_flags = 0;
11168         } else {
11169                 ch->chunk_flags = SCTP_HAD_NO_TCB;
11170         }
11171         ch->chunk_length = htons((uint16_t)(sizeof(struct sctp_chunkhdr) + cause_len));
11172         len += sizeof(struct sctp_chunkhdr);
11173         len += cause_len + padding_len;
11174
11175         if (SCTP_GET_HEADER_FOR_OUTPUT(o_pak)) {
11176                 sctp_m_freem(mout);
11177                 return;
11178         }
11179         SCTP_ATTACH_CHAIN(o_pak, mout, len);
11180         switch (dst->sa_family) {
11181 #ifdef INET
11182         case AF_INET:
11183                 if (port) {
11184                         if (V_udp_cksum) {
11185                                 udp->uh_sum = in_pseudo(ip->ip_src.s_addr, ip->ip_dst.s_addr, udp->uh_ulen + htons(IPPROTO_UDP));
11186                         } else {
11187                                 udp->uh_sum = 0;
11188                         }
11189                 }
11190                 ip->ip_len = htons(len);
11191                 if (port) {
11192                         shout->checksum = sctp_calculate_cksum(mout, sizeof(struct ip) + sizeof(struct udphdr));
11193                         SCTP_STAT_INCR(sctps_sendswcrc);
11194                         if (V_udp_cksum) {
11195                                 SCTP_ENABLE_UDP_CSUM(o_pak);
11196                         }
11197                 } else {
11198                         mout->m_pkthdr.csum_flags = CSUM_SCTP;
11199                         mout->m_pkthdr.csum_data = offsetof(struct sctphdr, checksum);
11200                         SCTP_STAT_INCR(sctps_sendhwcrc);
11201                 }
11202 #ifdef SCTP_PACKET_LOGGING
11203                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING) {
11204                         sctp_packet_log(o_pak);
11205                 }
11206 #endif
11207                 SCTP_PROBE5(send, NULL, NULL, ip, NULL, shout);
11208                 SCTP_IP_OUTPUT(ret, o_pak, NULL, NULL, vrf_id);
11209                 break;
11210 #endif
11211 #ifdef INET6
11212         case AF_INET6:
11213                 ip6->ip6_plen = htons((uint16_t)(len - sizeof(struct ip6_hdr)));
11214                 if (port) {
11215                         shout->checksum = sctp_calculate_cksum(mout, sizeof(struct ip6_hdr) + sizeof(struct udphdr));
11216                         SCTP_STAT_INCR(sctps_sendswcrc);
11217                         if ((udp->uh_sum = in6_cksum(o_pak, IPPROTO_UDP, sizeof(struct ip6_hdr), len - sizeof(struct ip6_hdr))) == 0) {
11218                                 udp->uh_sum = 0xffff;
11219                         }
11220                 } else {
11221                         mout->m_pkthdr.csum_flags = CSUM_SCTP_IPV6;
11222                         mout->m_pkthdr.csum_data = offsetof(struct sctphdr, checksum);
11223                         SCTP_STAT_INCR(sctps_sendhwcrc);
11224                 }
11225 #ifdef SCTP_PACKET_LOGGING
11226                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING) {
11227                         sctp_packet_log(o_pak);
11228                 }
11229 #endif
11230                 SCTP_PROBE5(send, NULL, NULL, ip6, NULL, shout);
11231                 SCTP_IP6_OUTPUT(ret, o_pak, NULL, NULL, NULL, vrf_id);
11232                 break;
11233 #endif
11234         default:
11235                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Unknown protocol (TSNH) type %d\n",
11236                     dst->sa_family);
11237                 sctp_m_freem(mout);
11238                 SCTP_LTRACE_ERR_RET_PKT(mout, NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EFAULT);
11239                 return;
11240         }
11241         SCTPDBG(SCTP_DEBUG_OUTPUT3, "return from send is %d\n", ret);
11242         if (port) {
11243                 UDPSTAT_INC(udps_opackets);
11244         }
11245         SCTP_STAT_INCR(sctps_sendpackets);
11246         SCTP_STAT_INCR_COUNTER64(sctps_outpackets);
11247         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
11248         if (ret) {
11249                 SCTP_STAT_INCR(sctps_senderrors);
11250         }
11251         return;
11252 }
11253
11254 void
11255 sctp_send_shutdown_complete2(struct sockaddr *src, struct sockaddr *dst,
11256     struct sctphdr *sh,
11257     uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum,
11258     uint32_t vrf_id, uint16_t port)
11259 {
11260         sctp_send_resp_msg(src, dst, sh, 0, SCTP_SHUTDOWN_COMPLETE, NULL,
11261             mflowtype, mflowid, fibnum,
11262             vrf_id, port);
11263 }
11264
11265 void
11266 sctp_send_hb(struct sctp_tcb *stcb, struct sctp_nets *net, int so_locked)
11267 {
11268         struct sctp_tmit_chunk *chk;
11269         struct sctp_heartbeat_chunk *hb;
11270         struct timeval now;
11271
11272         SCTP_TCB_LOCK_ASSERT(stcb);
11273         if (net == NULL) {
11274                 return;
11275         }
11276         (void)SCTP_GETTIME_TIMEVAL(&now);
11277         switch (net->ro._l_addr.sa.sa_family) {
11278 #ifdef INET
11279         case AF_INET:
11280                 break;
11281 #endif
11282 #ifdef INET6
11283         case AF_INET6:
11284                 break;
11285 #endif
11286         default:
11287                 return;
11288         }
11289         sctp_alloc_a_chunk(stcb, chk);
11290         if (chk == NULL) {
11291                 SCTPDBG(SCTP_DEBUG_OUTPUT4, "Gak, can't get a chunk for hb\n");
11292                 return;
11293         }
11294
11295         chk->copy_by_ref = 0;
11296         chk->rec.chunk_id.id = SCTP_HEARTBEAT_REQUEST;
11297         chk->rec.chunk_id.can_take_data = 1;
11298         chk->flags = 0;
11299         chk->asoc = &stcb->asoc;
11300         chk->send_size = sizeof(struct sctp_heartbeat_chunk);
11301
11302         chk->data = sctp_get_mbuf_for_msg(chk->send_size, 0, M_NOWAIT, 1, MT_HEADER);
11303         if (chk->data == NULL) {
11304                 sctp_free_a_chunk(stcb, chk, so_locked);
11305                 return;
11306         }
11307         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11308         SCTP_BUF_LEN(chk->data) = chk->send_size;
11309         chk->sent = SCTP_DATAGRAM_UNSENT;
11310         chk->snd_count = 0;
11311         chk->whoTo = net;
11312         atomic_add_int(&chk->whoTo->ref_count, 1);
11313         /* Now we have a mbuf that we can fill in with the details */
11314         hb = mtod(chk->data, struct sctp_heartbeat_chunk *);
11315         memset(hb, 0, sizeof(struct sctp_heartbeat_chunk));
11316         /* fill out chunk header */
11317         hb->ch.chunk_type = SCTP_HEARTBEAT_REQUEST;
11318         hb->ch.chunk_flags = 0;
11319         hb->ch.chunk_length = htons(chk->send_size);
11320         /* Fill out hb parameter */
11321         hb->heartbeat.hb_info.ph.param_type = htons(SCTP_HEARTBEAT_INFO);
11322         hb->heartbeat.hb_info.ph.param_length = htons(sizeof(struct sctp_heartbeat_info_param));
11323         hb->heartbeat.hb_info.time_value_1 = now.tv_sec;
11324         hb->heartbeat.hb_info.time_value_2 = now.tv_usec;
11325         /* Did our user request this one, put it in */
11326         hb->heartbeat.hb_info.addr_family = (uint8_t)net->ro._l_addr.sa.sa_family;
11327         hb->heartbeat.hb_info.addr_len = net->ro._l_addr.sa.sa_len;
11328         if (net->dest_state & SCTP_ADDR_UNCONFIRMED) {
11329                 /*
11330                  * we only take from the entropy pool if the address is not
11331                  * confirmed.
11332                  */
11333                 net->heartbeat_random1 = hb->heartbeat.hb_info.random_value1 = sctp_select_initial_TSN(&stcb->sctp_ep->sctp_ep);
11334                 net->heartbeat_random2 = hb->heartbeat.hb_info.random_value2 = sctp_select_initial_TSN(&stcb->sctp_ep->sctp_ep);
11335         } else {
11336                 net->heartbeat_random1 = hb->heartbeat.hb_info.random_value1 = 0;
11337                 net->heartbeat_random2 = hb->heartbeat.hb_info.random_value2 = 0;
11338         }
11339         switch (net->ro._l_addr.sa.sa_family) {
11340 #ifdef INET
11341         case AF_INET:
11342                 memcpy(hb->heartbeat.hb_info.address,
11343                     &net->ro._l_addr.sin.sin_addr,
11344                     sizeof(net->ro._l_addr.sin.sin_addr));
11345                 break;
11346 #endif
11347 #ifdef INET6
11348         case AF_INET6:
11349                 memcpy(hb->heartbeat.hb_info.address,
11350                     &net->ro._l_addr.sin6.sin6_addr,
11351                     sizeof(net->ro._l_addr.sin6.sin6_addr));
11352                 break;
11353 #endif
11354         default:
11355                 if (chk->data) {
11356                         sctp_m_freem(chk->data);
11357                         chk->data = NULL;
11358                 }
11359                 sctp_free_a_chunk(stcb, chk, so_locked);
11360                 return;
11361                 break;
11362         }
11363         net->hb_responded = 0;
11364         TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
11365         stcb->asoc.ctrl_queue_cnt++;
11366         SCTP_STAT_INCR(sctps_sendheartbeat);
11367         return;
11368 }
11369
11370 void
11371 sctp_send_ecn_echo(struct sctp_tcb *stcb, struct sctp_nets *net,
11372     uint32_t high_tsn)
11373 {
11374         struct sctp_association *asoc;
11375         struct sctp_ecne_chunk *ecne;
11376         struct sctp_tmit_chunk *chk;
11377
11378         if (net == NULL) {
11379                 return;
11380         }
11381         asoc = &stcb->asoc;
11382         SCTP_TCB_LOCK_ASSERT(stcb);
11383         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
11384                 if ((chk->rec.chunk_id.id == SCTP_ECN_ECHO) && (net == chk->whoTo)) {
11385                         /* found a previous ECN_ECHO update it if needed */
11386                         uint32_t cnt, ctsn;
11387
11388                         ecne = mtod(chk->data, struct sctp_ecne_chunk *);
11389                         ctsn = ntohl(ecne->tsn);
11390                         if (SCTP_TSN_GT(high_tsn, ctsn)) {
11391                                 ecne->tsn = htonl(high_tsn);
11392                                 SCTP_STAT_INCR(sctps_queue_upd_ecne);
11393                         }
11394                         cnt = ntohl(ecne->num_pkts_since_cwr);
11395                         cnt++;
11396                         ecne->num_pkts_since_cwr = htonl(cnt);
11397                         return;
11398                 }
11399         }
11400         /* nope could not find one to update so we must build one */
11401         sctp_alloc_a_chunk(stcb, chk);
11402         if (chk == NULL) {
11403                 return;
11404         }
11405         SCTP_STAT_INCR(sctps_queue_upd_ecne);
11406         chk->copy_by_ref = 0;
11407         chk->rec.chunk_id.id = SCTP_ECN_ECHO;
11408         chk->rec.chunk_id.can_take_data = 0;
11409         chk->flags = 0;
11410         chk->asoc = &stcb->asoc;
11411         chk->send_size = sizeof(struct sctp_ecne_chunk);
11412         chk->data = sctp_get_mbuf_for_msg(chk->send_size, 0, M_NOWAIT, 1, MT_HEADER);
11413         if (chk->data == NULL) {
11414                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
11415                 return;
11416         }
11417         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11418         SCTP_BUF_LEN(chk->data) = chk->send_size;
11419         chk->sent = SCTP_DATAGRAM_UNSENT;
11420         chk->snd_count = 0;
11421         chk->whoTo = net;
11422         atomic_add_int(&chk->whoTo->ref_count, 1);
11423
11424         stcb->asoc.ecn_echo_cnt_onq++;
11425         ecne = mtod(chk->data, struct sctp_ecne_chunk *);
11426         ecne->ch.chunk_type = SCTP_ECN_ECHO;
11427         ecne->ch.chunk_flags = 0;
11428         ecne->ch.chunk_length = htons(sizeof(struct sctp_ecne_chunk));
11429         ecne->tsn = htonl(high_tsn);
11430         ecne->num_pkts_since_cwr = htonl(1);
11431         TAILQ_INSERT_HEAD(&stcb->asoc.control_send_queue, chk, sctp_next);
11432         asoc->ctrl_queue_cnt++;
11433 }
11434
11435 void
11436 sctp_send_packet_dropped(struct sctp_tcb *stcb, struct sctp_nets *net,
11437     struct mbuf *m, int len, int iphlen, int bad_crc)
11438 {
11439         struct sctp_association *asoc;
11440         struct sctp_pktdrop_chunk *drp;
11441         struct sctp_tmit_chunk *chk;
11442         uint8_t *datap;
11443         int was_trunc = 0;
11444         int fullsz = 0;
11445         long spc;
11446         int offset;
11447         struct sctp_chunkhdr *ch, chunk_buf;
11448         unsigned int chk_length;
11449
11450         if (!stcb) {
11451                 return;
11452         }
11453         asoc = &stcb->asoc;
11454         SCTP_TCB_LOCK_ASSERT(stcb);
11455         if (asoc->pktdrop_supported == 0) {
11456                 /*-
11457                  * peer must declare support before I send one.
11458                  */
11459                 return;
11460         }
11461         if (stcb->sctp_socket == NULL) {
11462                 return;
11463         }
11464         sctp_alloc_a_chunk(stcb, chk);
11465         if (chk == NULL) {
11466                 return;
11467         }
11468         chk->copy_by_ref = 0;
11469         chk->rec.chunk_id.id = SCTP_PACKET_DROPPED;
11470         chk->rec.chunk_id.can_take_data = 1;
11471         chk->flags = 0;
11472         len -= iphlen;
11473         chk->send_size = len;
11474         /* Validate that we do not have an ABORT in here. */
11475         offset = iphlen + sizeof(struct sctphdr);
11476         ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, offset,
11477             sizeof(*ch), (uint8_t *)&chunk_buf);
11478         while (ch != NULL) {
11479                 chk_length = ntohs(ch->chunk_length);
11480                 if (chk_length < sizeof(*ch)) {
11481                         /* break to abort land */
11482                         break;
11483                 }
11484                 switch (ch->chunk_type) {
11485                 case SCTP_PACKET_DROPPED:
11486                 case SCTP_ABORT_ASSOCIATION:
11487                 case SCTP_INITIATION_ACK:
11488                         /**
11489                          * We don't respond with an PKT-DROP to an ABORT
11490                          * or PKT-DROP. We also do not respond to an
11491                          * INIT-ACK, because we can't know if the initiation
11492                          * tag is correct or not.
11493                          */
11494                         sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
11495                         return;
11496                 default:
11497                         break;
11498                 }
11499                 offset += SCTP_SIZE32(chk_length);
11500                 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, offset,
11501                     sizeof(*ch), (uint8_t *)&chunk_buf);
11502         }
11503
11504         if ((len + SCTP_MAX_OVERHEAD + sizeof(struct sctp_pktdrop_chunk)) >
11505             min(stcb->asoc.smallest_mtu, MCLBYTES)) {
11506                 /*
11507                  * only send 1 mtu worth, trim off the excess on the end.
11508                  */
11509                 fullsz = len;
11510                 len = min(stcb->asoc.smallest_mtu, MCLBYTES) - SCTP_MAX_OVERHEAD;
11511                 was_trunc = 1;
11512         }
11513         chk->asoc = &stcb->asoc;
11514         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
11515         if (chk->data == NULL) {
11516 jump_out:
11517                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
11518                 return;
11519         }
11520         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11521         drp = mtod(chk->data, struct sctp_pktdrop_chunk *);
11522         if (drp == NULL) {
11523                 sctp_m_freem(chk->data);
11524                 chk->data = NULL;
11525                 goto jump_out;
11526         }
11527         chk->book_size = SCTP_SIZE32((chk->send_size + sizeof(struct sctp_pktdrop_chunk) +
11528             sizeof(struct sctphdr) + SCTP_MED_OVERHEAD));
11529         chk->book_size_scale = 0;
11530         if (was_trunc) {
11531                 drp->ch.chunk_flags = SCTP_PACKET_TRUNCATED;
11532                 drp->trunc_len = htons(fullsz);
11533                 /*
11534                  * Len is already adjusted to size minus overhead above take
11535                  * out the pkt_drop chunk itself from it.
11536                  */
11537                 chk->send_size = (uint16_t)(len - sizeof(struct sctp_pktdrop_chunk));
11538                 len = chk->send_size;
11539         } else {
11540                 /* no truncation needed */
11541                 drp->ch.chunk_flags = 0;
11542                 drp->trunc_len = htons(0);
11543         }
11544         if (bad_crc) {
11545                 drp->ch.chunk_flags |= SCTP_BADCRC;
11546         }
11547         chk->send_size += sizeof(struct sctp_pktdrop_chunk);
11548         SCTP_BUF_LEN(chk->data) = chk->send_size;
11549         chk->sent = SCTP_DATAGRAM_UNSENT;
11550         chk->snd_count = 0;
11551         if (net) {
11552                 /* we should hit here */
11553                 chk->whoTo = net;
11554                 atomic_add_int(&chk->whoTo->ref_count, 1);
11555         } else {
11556                 chk->whoTo = NULL;
11557         }
11558         drp->ch.chunk_type = SCTP_PACKET_DROPPED;
11559         drp->ch.chunk_length = htons(chk->send_size);
11560         spc = SCTP_SB_LIMIT_RCV(stcb->sctp_socket);
11561         if (spc < 0) {
11562                 spc = 0;
11563         }
11564         drp->bottle_bw = htonl(spc);
11565         if (asoc->my_rwnd) {
11566                 drp->current_onq = htonl(asoc->size_on_reasm_queue +
11567                     asoc->size_on_all_streams +
11568                     asoc->my_rwnd_control_len +
11569                     stcb->sctp_socket->so_rcv.sb_cc);
11570         } else {
11571                 /*-
11572                  * If my rwnd is 0, possibly from mbuf depletion as well as
11573                  * space used, tell the peer there is NO space aka onq == bw
11574                  */
11575                 drp->current_onq = htonl(spc);
11576         }
11577         drp->reserved = 0;
11578         datap = drp->data;
11579         m_copydata(m, iphlen, len, (caddr_t)datap);
11580         TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
11581         asoc->ctrl_queue_cnt++;
11582 }
11583
11584 void
11585 sctp_send_cwr(struct sctp_tcb *stcb, struct sctp_nets *net, uint32_t high_tsn, uint8_t override)
11586 {
11587         struct sctp_association *asoc;
11588         struct sctp_cwr_chunk *cwr;
11589         struct sctp_tmit_chunk *chk;
11590
11591         SCTP_TCB_LOCK_ASSERT(stcb);
11592         if (net == NULL) {
11593                 return;
11594         }
11595         asoc = &stcb->asoc;
11596         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
11597                 if ((chk->rec.chunk_id.id == SCTP_ECN_CWR) && (net == chk->whoTo)) {
11598                         /*
11599                          * found a previous CWR queued to same destination
11600                          * update it if needed
11601                          */
11602                         uint32_t ctsn;
11603
11604                         cwr = mtod(chk->data, struct sctp_cwr_chunk *);
11605                         ctsn = ntohl(cwr->tsn);
11606                         if (SCTP_TSN_GT(high_tsn, ctsn)) {
11607                                 cwr->tsn = htonl(high_tsn);
11608                         }
11609                         if (override & SCTP_CWR_REDUCE_OVERRIDE) {
11610                                 /* Make sure override is carried */
11611                                 cwr->ch.chunk_flags |= SCTP_CWR_REDUCE_OVERRIDE;
11612                         }
11613                         return;
11614                 }
11615         }
11616         sctp_alloc_a_chunk(stcb, chk);
11617         if (chk == NULL) {
11618                 return;
11619         }
11620         chk->copy_by_ref = 0;
11621         chk->rec.chunk_id.id = SCTP_ECN_CWR;
11622         chk->rec.chunk_id.can_take_data = 1;
11623         chk->flags = 0;
11624         chk->asoc = &stcb->asoc;
11625         chk->send_size = sizeof(struct sctp_cwr_chunk);
11626         chk->data = sctp_get_mbuf_for_msg(chk->send_size, 0, M_NOWAIT, 1, MT_HEADER);
11627         if (chk->data == NULL) {
11628                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
11629                 return;
11630         }
11631         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11632         SCTP_BUF_LEN(chk->data) = chk->send_size;
11633         chk->sent = SCTP_DATAGRAM_UNSENT;
11634         chk->snd_count = 0;
11635         chk->whoTo = net;
11636         atomic_add_int(&chk->whoTo->ref_count, 1);
11637         cwr = mtod(chk->data, struct sctp_cwr_chunk *);
11638         cwr->ch.chunk_type = SCTP_ECN_CWR;
11639         cwr->ch.chunk_flags = override;
11640         cwr->ch.chunk_length = htons(sizeof(struct sctp_cwr_chunk));
11641         cwr->tsn = htonl(high_tsn);
11642         TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
11643         asoc->ctrl_queue_cnt++;
11644 }
11645
11646 static int
11647 sctp_add_stream_reset_out(struct sctp_tcb *stcb, struct sctp_tmit_chunk *chk,
11648     uint32_t seq, uint32_t resp_seq, uint32_t last_sent)
11649 {
11650         uint16_t len, old_len, i;
11651         struct sctp_stream_reset_out_request *req_out;
11652         struct sctp_chunkhdr *ch;
11653         int at;
11654         int number_entries = 0;
11655
11656         ch = mtod(chk->data, struct sctp_chunkhdr *);
11657         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11658         /* get to new offset for the param. */
11659         req_out = (struct sctp_stream_reset_out_request *)((caddr_t)ch + len);
11660         /* now how long will this param be? */
11661         for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
11662                 if ((stcb->asoc.strmout[i].state == SCTP_STREAM_RESET_PENDING) &&
11663                     (stcb->asoc.strmout[i].chunks_on_queues == 0) &&
11664                     TAILQ_EMPTY(&stcb->asoc.strmout[i].outqueue)) {
11665                         number_entries++;
11666                 }
11667         }
11668         if (number_entries == 0) {
11669                 return (0);
11670         }
11671         if (number_entries == stcb->asoc.streamoutcnt) {
11672                 number_entries = 0;
11673         }
11674         if (number_entries > SCTP_MAX_STREAMS_AT_ONCE_RESET) {
11675                 number_entries = SCTP_MAX_STREAMS_AT_ONCE_RESET;
11676         }
11677         len = (uint16_t)(sizeof(struct sctp_stream_reset_out_request) + (sizeof(uint16_t) * number_entries));
11678         req_out->ph.param_type = htons(SCTP_STR_RESET_OUT_REQUEST);
11679         req_out->ph.param_length = htons(len);
11680         req_out->request_seq = htonl(seq);
11681         req_out->response_seq = htonl(resp_seq);
11682         req_out->send_reset_at_tsn = htonl(last_sent);
11683         at = 0;
11684         if (number_entries) {
11685                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
11686                         if ((stcb->asoc.strmout[i].state == SCTP_STREAM_RESET_PENDING) &&
11687                             (stcb->asoc.strmout[i].chunks_on_queues == 0) &&
11688                             TAILQ_EMPTY(&stcb->asoc.strmout[i].outqueue)) {
11689                                 req_out->list_of_streams[at] = htons(i);
11690                                 at++;
11691                                 stcb->asoc.strmout[i].state = SCTP_STREAM_RESET_IN_FLIGHT;
11692                                 if (at >= number_entries) {
11693                                         break;
11694                                 }
11695                         }
11696                 }
11697         } else {
11698                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
11699                         stcb->asoc.strmout[i].state = SCTP_STREAM_RESET_IN_FLIGHT;
11700                 }
11701         }
11702         if (SCTP_SIZE32(len) > len) {
11703                 /*-
11704                  * Need to worry about the pad we may end up adding to the
11705                  * end. This is easy since the struct is either aligned to 4
11706                  * bytes or 2 bytes off.
11707                  */
11708                 req_out->list_of_streams[number_entries] = 0;
11709         }
11710         /* now fix the chunk length */
11711         ch->chunk_length = htons(len + old_len);
11712         chk->book_size = len + old_len;
11713         chk->book_size_scale = 0;
11714         chk->send_size = SCTP_SIZE32(chk->book_size);
11715         SCTP_BUF_LEN(chk->data) = chk->send_size;
11716         return (1);
11717 }
11718
11719 static void
11720 sctp_add_stream_reset_in(struct sctp_tmit_chunk *chk,
11721     int number_entries, uint16_t *list,
11722     uint32_t seq)
11723 {
11724         uint16_t len, old_len, i;
11725         struct sctp_stream_reset_in_request *req_in;
11726         struct sctp_chunkhdr *ch;
11727
11728         ch = mtod(chk->data, struct sctp_chunkhdr *);
11729         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11730
11731         /* get to new offset for the param. */
11732         req_in = (struct sctp_stream_reset_in_request *)((caddr_t)ch + len);
11733         /* now how long will this param be? */
11734         len = (uint16_t)(sizeof(struct sctp_stream_reset_in_request) + (sizeof(uint16_t) * number_entries));
11735         req_in->ph.param_type = htons(SCTP_STR_RESET_IN_REQUEST);
11736         req_in->ph.param_length = htons(len);
11737         req_in->request_seq = htonl(seq);
11738         if (number_entries) {
11739                 for (i = 0; i < number_entries; i++) {
11740                         req_in->list_of_streams[i] = htons(list[i]);
11741                 }
11742         }
11743         if (SCTP_SIZE32(len) > len) {
11744                 /*-
11745                  * Need to worry about the pad we may end up adding to the
11746                  * end. This is easy since the struct is either aligned to 4
11747                  * bytes or 2 bytes off.
11748                  */
11749                 req_in->list_of_streams[number_entries] = 0;
11750         }
11751         /* now fix the chunk length */
11752         ch->chunk_length = htons(len + old_len);
11753         chk->book_size = len + old_len;
11754         chk->book_size_scale = 0;
11755         chk->send_size = SCTP_SIZE32(chk->book_size);
11756         SCTP_BUF_LEN(chk->data) = chk->send_size;
11757         return;
11758 }
11759
11760 static void
11761 sctp_add_stream_reset_tsn(struct sctp_tmit_chunk *chk,
11762     uint32_t seq)
11763 {
11764         uint16_t len, old_len;
11765         struct sctp_stream_reset_tsn_request *req_tsn;
11766         struct sctp_chunkhdr *ch;
11767
11768         ch = mtod(chk->data, struct sctp_chunkhdr *);
11769         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11770
11771         /* get to new offset for the param. */
11772         req_tsn = (struct sctp_stream_reset_tsn_request *)((caddr_t)ch + len);
11773         /* now how long will this param be? */
11774         len = sizeof(struct sctp_stream_reset_tsn_request);
11775         req_tsn->ph.param_type = htons(SCTP_STR_RESET_TSN_REQUEST);
11776         req_tsn->ph.param_length = htons(len);
11777         req_tsn->request_seq = htonl(seq);
11778
11779         /* now fix the chunk length */
11780         ch->chunk_length = htons(len + old_len);
11781         chk->send_size = len + old_len;
11782         chk->book_size = SCTP_SIZE32(chk->send_size);
11783         chk->book_size_scale = 0;
11784         SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size);
11785         return;
11786 }
11787
11788 void
11789 sctp_add_stream_reset_result(struct sctp_tmit_chunk *chk,
11790     uint32_t resp_seq, uint32_t result)
11791 {
11792         uint16_t len, old_len;
11793         struct sctp_stream_reset_response *resp;
11794         struct sctp_chunkhdr *ch;
11795
11796         ch = mtod(chk->data, struct sctp_chunkhdr *);
11797         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11798
11799         /* get to new offset for the param. */
11800         resp = (struct sctp_stream_reset_response *)((caddr_t)ch + len);
11801         /* now how long will this param be? */
11802         len = sizeof(struct sctp_stream_reset_response);
11803         resp->ph.param_type = htons(SCTP_STR_RESET_RESPONSE);
11804         resp->ph.param_length = htons(len);
11805         resp->response_seq = htonl(resp_seq);
11806         resp->result = ntohl(result);
11807
11808         /* now fix the chunk length */
11809         ch->chunk_length = htons(len + old_len);
11810         chk->book_size = len + old_len;
11811         chk->book_size_scale = 0;
11812         chk->send_size = SCTP_SIZE32(chk->book_size);
11813         SCTP_BUF_LEN(chk->data) = chk->send_size;
11814         return;
11815 }
11816
11817 void
11818 sctp_send_deferred_reset_response(struct sctp_tcb *stcb,
11819     struct sctp_stream_reset_list *ent,
11820     int response)
11821 {
11822         struct sctp_association *asoc;
11823         struct sctp_tmit_chunk *chk;
11824         struct sctp_chunkhdr *ch;
11825
11826         asoc = &stcb->asoc;
11827
11828         /*
11829          * Reset our last reset action to the new one IP -> response
11830          * (PERFORMED probably). This assures that if we fail to send, a
11831          * retran from the peer will get the new response.
11832          */
11833         asoc->last_reset_action[0] = response;
11834         if (asoc->stream_reset_outstanding) {
11835                 return;
11836         }
11837         sctp_alloc_a_chunk(stcb, chk);
11838         if (chk == NULL) {
11839                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
11840                 return;
11841         }
11842         chk->copy_by_ref = 0;
11843         chk->rec.chunk_id.id = SCTP_STREAM_RESET;
11844         chk->rec.chunk_id.can_take_data = 0;
11845         chk->flags = 0;
11846         chk->asoc = &stcb->asoc;
11847         chk->book_size = sizeof(struct sctp_chunkhdr);
11848         chk->send_size = SCTP_SIZE32(chk->book_size);
11849         chk->book_size_scale = 0;
11850         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
11851         if (chk->data == NULL) {
11852                 sctp_free_a_chunk(stcb, chk, SCTP_SO_LOCKED);
11853                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
11854                 return;
11855         }
11856         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11857         /* setup chunk parameters */
11858         chk->sent = SCTP_DATAGRAM_UNSENT;
11859         chk->snd_count = 0;
11860         if (stcb->asoc.alternate) {
11861                 chk->whoTo = stcb->asoc.alternate;
11862         } else {
11863                 chk->whoTo = stcb->asoc.primary_destination;
11864         }
11865         ch = mtod(chk->data, struct sctp_chunkhdr *);
11866         ch->chunk_type = SCTP_STREAM_RESET;
11867         ch->chunk_flags = 0;
11868         ch->chunk_length = htons(chk->book_size);
11869         atomic_add_int(&chk->whoTo->ref_count, 1);
11870         SCTP_BUF_LEN(chk->data) = chk->send_size;
11871         sctp_add_stream_reset_result(chk, ent->seq, response);
11872         /* insert the chunk for sending */
11873         TAILQ_INSERT_TAIL(&asoc->control_send_queue,
11874             chk,
11875             sctp_next);
11876         asoc->ctrl_queue_cnt++;
11877 }
11878
11879 void
11880 sctp_add_stream_reset_result_tsn(struct sctp_tmit_chunk *chk,
11881     uint32_t resp_seq, uint32_t result,
11882     uint32_t send_una, uint32_t recv_next)
11883 {
11884         uint16_t len, old_len;
11885         struct sctp_stream_reset_response_tsn *resp;
11886         struct sctp_chunkhdr *ch;
11887
11888         ch = mtod(chk->data, struct sctp_chunkhdr *);
11889         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11890
11891         /* get to new offset for the param. */
11892         resp = (struct sctp_stream_reset_response_tsn *)((caddr_t)ch + len);
11893         /* now how long will this param be? */
11894         len = sizeof(struct sctp_stream_reset_response_tsn);
11895         resp->ph.param_type = htons(SCTP_STR_RESET_RESPONSE);
11896         resp->ph.param_length = htons(len);
11897         resp->response_seq = htonl(resp_seq);
11898         resp->result = htonl(result);
11899         resp->senders_next_tsn = htonl(send_una);
11900         resp->receivers_next_tsn = htonl(recv_next);
11901
11902         /* now fix the chunk length */
11903         ch->chunk_length = htons(len + old_len);
11904         chk->book_size = len + old_len;
11905         chk->send_size = SCTP_SIZE32(chk->book_size);
11906         chk->book_size_scale = 0;
11907         SCTP_BUF_LEN(chk->data) = chk->send_size;
11908         return;
11909 }
11910
11911 static void
11912 sctp_add_an_out_stream(struct sctp_tmit_chunk *chk,
11913     uint32_t seq,
11914     uint16_t adding)
11915 {
11916         uint16_t len, old_len;
11917         struct sctp_chunkhdr *ch;
11918         struct sctp_stream_reset_add_strm *addstr;
11919
11920         ch = mtod(chk->data, struct sctp_chunkhdr *);
11921         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11922
11923         /* get to new offset for the param. */
11924         addstr = (struct sctp_stream_reset_add_strm *)((caddr_t)ch + len);
11925         /* now how long will this param be? */
11926         len = sizeof(struct sctp_stream_reset_add_strm);
11927
11928         /* Fill it out. */
11929         addstr->ph.param_type = htons(SCTP_STR_RESET_ADD_OUT_STREAMS);
11930         addstr->ph.param_length = htons(len);
11931         addstr->request_seq = htonl(seq);
11932         addstr->number_of_streams = htons(adding);
11933         addstr->reserved = 0;
11934
11935         /* now fix the chunk length */
11936         ch->chunk_length = htons(len + old_len);
11937         chk->send_size = len + old_len;
11938         chk->book_size = SCTP_SIZE32(chk->send_size);
11939         chk->book_size_scale = 0;
11940         SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size);
11941         return;
11942 }
11943
11944 static void
11945 sctp_add_an_in_stream(struct sctp_tmit_chunk *chk,
11946     uint32_t seq,
11947     uint16_t adding)
11948 {
11949         uint16_t len, old_len;
11950         struct sctp_chunkhdr *ch;
11951         struct sctp_stream_reset_add_strm *addstr;
11952
11953         ch = mtod(chk->data, struct sctp_chunkhdr *);
11954         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11955
11956         /* get to new offset for the param. */
11957         addstr = (struct sctp_stream_reset_add_strm *)((caddr_t)ch + len);
11958         /* now how long will this param be? */
11959         len = sizeof(struct sctp_stream_reset_add_strm);
11960         /* Fill it out. */
11961         addstr->ph.param_type = htons(SCTP_STR_RESET_ADD_IN_STREAMS);
11962         addstr->ph.param_length = htons(len);
11963         addstr->request_seq = htonl(seq);
11964         addstr->number_of_streams = htons(adding);
11965         addstr->reserved = 0;
11966
11967         /* now fix the chunk length */
11968         ch->chunk_length = htons(len + old_len);
11969         chk->send_size = len + old_len;
11970         chk->book_size = SCTP_SIZE32(chk->send_size);
11971         chk->book_size_scale = 0;
11972         SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size);
11973         return;
11974 }
11975
11976 int
11977 sctp_send_stream_reset_out_if_possible(struct sctp_tcb *stcb, int so_locked)
11978 {
11979         struct sctp_association *asoc;
11980         struct sctp_tmit_chunk *chk;
11981         struct sctp_chunkhdr *ch;
11982         uint32_t seq;
11983
11984         asoc = &stcb->asoc;
11985         asoc->trigger_reset = 0;
11986         if (asoc->stream_reset_outstanding) {
11987                 return (EALREADY);
11988         }
11989         sctp_alloc_a_chunk(stcb, chk);
11990         if (chk == NULL) {
11991                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
11992                 return (ENOMEM);
11993         }
11994         chk->copy_by_ref = 0;
11995         chk->rec.chunk_id.id = SCTP_STREAM_RESET;
11996         chk->rec.chunk_id.can_take_data = 0;
11997         chk->flags = 0;
11998         chk->asoc = &stcb->asoc;
11999         chk->book_size = sizeof(struct sctp_chunkhdr);
12000         chk->send_size = SCTP_SIZE32(chk->book_size);
12001         chk->book_size_scale = 0;
12002         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
12003         if (chk->data == NULL) {
12004                 sctp_free_a_chunk(stcb, chk, so_locked);
12005                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12006                 return (ENOMEM);
12007         }
12008         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
12009
12010         /* setup chunk parameters */
12011         chk->sent = SCTP_DATAGRAM_UNSENT;
12012         chk->snd_count = 0;
12013         if (stcb->asoc.alternate) {
12014                 chk->whoTo = stcb->asoc.alternate;
12015         } else {
12016                 chk->whoTo = stcb->asoc.primary_destination;
12017         }
12018         ch = mtod(chk->data, struct sctp_chunkhdr *);
12019         ch->chunk_type = SCTP_STREAM_RESET;
12020         ch->chunk_flags = 0;
12021         ch->chunk_length = htons(chk->book_size);
12022         atomic_add_int(&chk->whoTo->ref_count, 1);
12023         SCTP_BUF_LEN(chk->data) = chk->send_size;
12024         seq = stcb->asoc.str_reset_seq_out;
12025         if (sctp_add_stream_reset_out(stcb, chk, seq, (stcb->asoc.str_reset_seq_in - 1), (stcb->asoc.sending_seq - 1))) {
12026                 seq++;
12027                 asoc->stream_reset_outstanding++;
12028         } else {
12029                 m_freem(chk->data);
12030                 chk->data = NULL;
12031                 sctp_free_a_chunk(stcb, chk, so_locked);
12032                 return (ENOENT);
12033         }
12034         asoc->str_reset = chk;
12035         /* insert the chunk for sending */
12036         TAILQ_INSERT_TAIL(&asoc->control_send_queue,
12037             chk,
12038             sctp_next);
12039         asoc->ctrl_queue_cnt++;
12040
12041         if (stcb->asoc.send_sack) {
12042                 sctp_send_sack(stcb, so_locked);
12043         }
12044         sctp_timer_start(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb, chk->whoTo);
12045         return (0);
12046 }
12047
12048 int
12049 sctp_send_str_reset_req(struct sctp_tcb *stcb,
12050     uint16_t number_entries, uint16_t *list,
12051     uint8_t send_in_req,
12052     uint8_t send_tsn_req,
12053     uint8_t add_stream,
12054     uint16_t adding_o,
12055     uint16_t adding_i, uint8_t peer_asked)
12056 {
12057         struct sctp_association *asoc;
12058         struct sctp_tmit_chunk *chk;
12059         struct sctp_chunkhdr *ch;
12060         int can_send_out_req = 0;
12061         uint32_t seq;
12062
12063         asoc = &stcb->asoc;
12064         if (asoc->stream_reset_outstanding) {
12065                 /*-
12066                  * Already one pending, must get ACK back to clear the flag.
12067                  */
12068                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EBUSY);
12069                 return (EBUSY);
12070         }
12071         if ((send_in_req == 0) && (send_tsn_req == 0) &&
12072             (add_stream == 0)) {
12073                 /* nothing to do */
12074                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12075                 return (EINVAL);
12076         }
12077         if (send_tsn_req && send_in_req) {
12078                 /* error, can't do that */
12079                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12080                 return (EINVAL);
12081         } else if (send_in_req) {
12082                 can_send_out_req = 1;
12083         }
12084         if (number_entries > (MCLBYTES -
12085             SCTP_MIN_OVERHEAD -
12086             sizeof(struct sctp_chunkhdr) -
12087             sizeof(struct sctp_stream_reset_out_request)) /
12088             sizeof(uint16_t)) {
12089                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12090                 return (ENOMEM);
12091         }
12092         sctp_alloc_a_chunk(stcb, chk);
12093         if (chk == NULL) {
12094                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12095                 return (ENOMEM);
12096         }
12097         chk->copy_by_ref = 0;
12098         chk->rec.chunk_id.id = SCTP_STREAM_RESET;
12099         chk->rec.chunk_id.can_take_data = 0;
12100         chk->flags = 0;
12101         chk->asoc = &stcb->asoc;
12102         chk->book_size = sizeof(struct sctp_chunkhdr);
12103         chk->send_size = SCTP_SIZE32(chk->book_size);
12104         chk->book_size_scale = 0;
12105         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
12106         if (chk->data == NULL) {
12107                 sctp_free_a_chunk(stcb, chk, SCTP_SO_LOCKED);
12108                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12109                 return (ENOMEM);
12110         }
12111         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
12112
12113         /* setup chunk parameters */
12114         chk->sent = SCTP_DATAGRAM_UNSENT;
12115         chk->snd_count = 0;
12116         if (stcb->asoc.alternate) {
12117                 chk->whoTo = stcb->asoc.alternate;
12118         } else {
12119                 chk->whoTo = stcb->asoc.primary_destination;
12120         }
12121         atomic_add_int(&chk->whoTo->ref_count, 1);
12122         ch = mtod(chk->data, struct sctp_chunkhdr *);
12123         ch->chunk_type = SCTP_STREAM_RESET;
12124         ch->chunk_flags = 0;
12125         ch->chunk_length = htons(chk->book_size);
12126         SCTP_BUF_LEN(chk->data) = chk->send_size;
12127
12128         seq = stcb->asoc.str_reset_seq_out;
12129         if (can_send_out_req) {
12130                 int ret;
12131
12132                 ret = sctp_add_stream_reset_out(stcb, chk, seq, (stcb->asoc.str_reset_seq_in - 1), (stcb->asoc.sending_seq - 1));
12133                 if (ret) {
12134                         seq++;
12135                         asoc->stream_reset_outstanding++;
12136                 }
12137         }
12138         if ((add_stream & 1) &&
12139             ((stcb->asoc.strm_realoutsize - stcb->asoc.streamoutcnt) < adding_o)) {
12140                 /* Need to allocate more */
12141                 struct sctp_stream_out *oldstream;
12142                 struct sctp_stream_queue_pending *sp, *nsp;
12143                 int i;
12144 #if defined(SCTP_DETAILED_STR_STATS)
12145                 int j;
12146 #endif
12147
12148                 oldstream = stcb->asoc.strmout;
12149                 /* get some more */
12150                 SCTP_MALLOC(stcb->asoc.strmout, struct sctp_stream_out *,
12151                     (stcb->asoc.streamoutcnt + adding_o) * sizeof(struct sctp_stream_out),
12152                     SCTP_M_STRMO);
12153                 if (stcb->asoc.strmout == NULL) {
12154                         uint8_t x;
12155
12156                         stcb->asoc.strmout = oldstream;
12157                         /* Turn off the bit */
12158                         x = add_stream & 0xfe;
12159                         add_stream = x;
12160                         goto skip_stuff;
12161                 }
12162                 /*
12163                  * Ok now we proceed with copying the old out stuff and
12164                  * initializing the new stuff.
12165                  */
12166                 SCTP_TCB_SEND_LOCK(stcb);
12167                 stcb->asoc.ss_functions.sctp_ss_clear(stcb, &stcb->asoc, 0, 1);
12168                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
12169                         TAILQ_INIT(&stcb->asoc.strmout[i].outqueue);
12170                         stcb->asoc.strmout[i].chunks_on_queues = oldstream[i].chunks_on_queues;
12171                         stcb->asoc.strmout[i].next_mid_ordered = oldstream[i].next_mid_ordered;
12172                         stcb->asoc.strmout[i].next_mid_unordered = oldstream[i].next_mid_unordered;
12173                         stcb->asoc.strmout[i].last_msg_incomplete = oldstream[i].last_msg_incomplete;
12174                         stcb->asoc.strmout[i].sid = i;
12175                         stcb->asoc.strmout[i].state = oldstream[i].state;
12176                         /* FIX ME FIX ME */
12177                         /*
12178                          * This should be a SS_COPY operation FIX ME STREAM
12179                          * SCHEDULER EXPERT
12180                          */
12181                         stcb->asoc.ss_functions.sctp_ss_init_stream(stcb, &stcb->asoc.strmout[i], &oldstream[i]);
12182                         /* now anything on those queues? */
12183                         TAILQ_FOREACH_SAFE(sp, &oldstream[i].outqueue, next, nsp) {
12184                                 TAILQ_REMOVE(&oldstream[i].outqueue, sp, next);
12185                                 TAILQ_INSERT_TAIL(&stcb->asoc.strmout[i].outqueue, sp, next);
12186                         }
12187
12188                 }
12189                 /* now the new streams */
12190                 stcb->asoc.ss_functions.sctp_ss_init(stcb, &stcb->asoc, 1);
12191                 for (i = stcb->asoc.streamoutcnt; i < (stcb->asoc.streamoutcnt + adding_o); i++) {
12192                         TAILQ_INIT(&stcb->asoc.strmout[i].outqueue);
12193                         stcb->asoc.strmout[i].chunks_on_queues = 0;
12194 #if defined(SCTP_DETAILED_STR_STATS)
12195                         for (j = 0; j < SCTP_PR_SCTP_MAX + 1; j++) {
12196                                 stcb->asoc.strmout[i].abandoned_sent[j] = 0;
12197                                 stcb->asoc.strmout[i].abandoned_unsent[j] = 0;
12198                         }
12199 #else
12200                         stcb->asoc.strmout[i].abandoned_sent[0] = 0;
12201                         stcb->asoc.strmout[i].abandoned_unsent[0] = 0;
12202 #endif
12203                         stcb->asoc.strmout[i].next_mid_ordered = 0;
12204                         stcb->asoc.strmout[i].next_mid_unordered = 0;
12205                         stcb->asoc.strmout[i].sid = i;
12206                         stcb->asoc.strmout[i].last_msg_incomplete = 0;
12207                         stcb->asoc.ss_functions.sctp_ss_init_stream(stcb, &stcb->asoc.strmout[i], NULL);
12208                         stcb->asoc.strmout[i].state = SCTP_STREAM_CLOSED;
12209                 }
12210                 stcb->asoc.strm_realoutsize = stcb->asoc.streamoutcnt + adding_o;
12211                 SCTP_FREE(oldstream, SCTP_M_STRMO);
12212                 SCTP_TCB_SEND_UNLOCK(stcb);
12213         }
12214 skip_stuff:
12215         if ((add_stream & 1) && (adding_o > 0)) {
12216                 asoc->strm_pending_add_size = adding_o;
12217                 asoc->peer_req_out = peer_asked;
12218                 sctp_add_an_out_stream(chk, seq, adding_o);
12219                 seq++;
12220                 asoc->stream_reset_outstanding++;
12221         }
12222         if ((add_stream & 2) && (adding_i > 0)) {
12223                 sctp_add_an_in_stream(chk, seq, adding_i);
12224                 seq++;
12225                 asoc->stream_reset_outstanding++;
12226         }
12227         if (send_in_req) {
12228                 sctp_add_stream_reset_in(chk, number_entries, list, seq);
12229                 seq++;
12230                 asoc->stream_reset_outstanding++;
12231         }
12232         if (send_tsn_req) {
12233                 sctp_add_stream_reset_tsn(chk, seq);
12234                 asoc->stream_reset_outstanding++;
12235         }
12236         asoc->str_reset = chk;
12237         /* insert the chunk for sending */
12238         TAILQ_INSERT_TAIL(&asoc->control_send_queue,
12239             chk,
12240             sctp_next);
12241         asoc->ctrl_queue_cnt++;
12242         if (stcb->asoc.send_sack) {
12243                 sctp_send_sack(stcb, SCTP_SO_LOCKED);
12244         }
12245         sctp_timer_start(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb, chk->whoTo);
12246         return (0);
12247 }
12248
12249 void
12250 sctp_send_abort(struct mbuf *m, int iphlen, struct sockaddr *src, struct sockaddr *dst,
12251     struct sctphdr *sh, uint32_t vtag, struct mbuf *cause,
12252     uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum,
12253     uint32_t vrf_id, uint16_t port)
12254 {
12255         /* Don't respond to an ABORT with an ABORT. */
12256         if (sctp_is_there_an_abort_here(m, iphlen, &vtag)) {
12257                 if (cause)
12258                         sctp_m_freem(cause);
12259                 return;
12260         }
12261         sctp_send_resp_msg(src, dst, sh, vtag, SCTP_ABORT_ASSOCIATION, cause,
12262             mflowtype, mflowid, fibnum,
12263             vrf_id, port);
12264         return;
12265 }
12266
12267 void
12268 sctp_send_operr_to(struct sockaddr *src, struct sockaddr *dst,
12269     struct sctphdr *sh, uint32_t vtag, struct mbuf *cause,
12270     uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum,
12271     uint32_t vrf_id, uint16_t port)
12272 {
12273         sctp_send_resp_msg(src, dst, sh, vtag, SCTP_OPERATION_ERROR, cause,
12274             mflowtype, mflowid, fibnum,
12275             vrf_id, port);
12276         return;
12277 }
12278
12279 static struct mbuf *
12280 sctp_copy_resume(struct uio *uio,
12281     int max_send_len,
12282     int user_marks_eor,
12283     int *error,
12284     uint32_t *sndout,
12285     struct mbuf **new_tail)
12286 {
12287         struct mbuf *m;
12288
12289         m = m_uiotombuf(uio, M_WAITOK, max_send_len, 0,
12290             (M_PKTHDR | (user_marks_eor ? M_EOR : 0)));
12291         if (m == NULL) {
12292                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOBUFS);
12293                 *error = ENOBUFS;
12294         } else {
12295                 *sndout = m_length(m, NULL);
12296                 *new_tail = m_last(m);
12297         }
12298         return (m);
12299 }
12300
12301 static int
12302 sctp_copy_one(struct sctp_stream_queue_pending *sp,
12303     struct uio *uio,
12304     int resv_upfront)
12305 {
12306         sp->data = m_uiotombuf(uio, M_WAITOK, sp->length,
12307             resv_upfront, 0);
12308         if (sp->data == NULL) {
12309                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOBUFS);
12310                 return (ENOBUFS);
12311         }
12312
12313         sp->tail_mbuf = m_last(sp->data);
12314         return (0);
12315 }
12316
12317
12318
12319 static struct sctp_stream_queue_pending *
12320 sctp_copy_it_in(struct sctp_tcb *stcb,
12321     struct sctp_association *asoc,
12322     struct sctp_sndrcvinfo *srcv,
12323     struct uio *uio,
12324     struct sctp_nets *net,
12325     ssize_t max_send_len,
12326     int user_marks_eor,
12327     int *error)
12328 {
12329
12330         /*-
12331          * This routine must be very careful in its work. Protocol
12332          * processing is up and running so care must be taken to spl...()
12333          * when you need to do something that may effect the stcb/asoc. The
12334          * sb is locked however. When data is copied the protocol processing
12335          * should be enabled since this is a slower operation...
12336          */
12337         struct sctp_stream_queue_pending *sp = NULL;
12338         int resv_in_first;
12339
12340         *error = 0;
12341         /* Now can we send this? */
12342         if ((SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_SENT) ||
12343             (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_ACK_SENT) ||
12344             (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_RECEIVED) ||
12345             (asoc->state & SCTP_STATE_SHUTDOWN_PENDING)) {
12346                 /* got data while shutting down */
12347                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
12348                 *error = ECONNRESET;
12349                 goto out_now;
12350         }
12351         sctp_alloc_a_strmoq(stcb, sp);
12352         if (sp == NULL) {
12353                 SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12354                 *error = ENOMEM;
12355                 goto out_now;
12356         }
12357         sp->act_flags = 0;
12358         sp->sender_all_done = 0;
12359         sp->sinfo_flags = srcv->sinfo_flags;
12360         sp->timetolive = srcv->sinfo_timetolive;
12361         sp->ppid = srcv->sinfo_ppid;
12362         sp->context = srcv->sinfo_context;
12363         sp->fsn = 0;
12364         (void)SCTP_GETTIME_TIMEVAL(&sp->ts);
12365
12366         sp->sid = srcv->sinfo_stream;
12367         sp->length = (uint32_t)min(uio->uio_resid, max_send_len);
12368         if ((sp->length == (uint32_t)uio->uio_resid) &&
12369             ((user_marks_eor == 0) ||
12370             (srcv->sinfo_flags & SCTP_EOF) ||
12371             (user_marks_eor && (srcv->sinfo_flags & SCTP_EOR)))) {
12372                 sp->msg_is_complete = 1;
12373         } else {
12374                 sp->msg_is_complete = 0;
12375         }
12376         sp->sender_all_done = 0;
12377         sp->some_taken = 0;
12378         sp->put_last_out = 0;
12379         resv_in_first = SCTP_DATA_CHUNK_OVERHEAD(stcb);
12380         sp->data = sp->tail_mbuf = NULL;
12381         if (sp->length == 0) {
12382                 goto skip_copy;
12383         }
12384         if (srcv->sinfo_keynumber_valid) {
12385                 sp->auth_keyid = srcv->sinfo_keynumber;
12386         } else {
12387                 sp->auth_keyid = stcb->asoc.authinfo.active_keyid;
12388         }
12389         if (sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks)) {
12390                 sctp_auth_key_acquire(stcb, sp->auth_keyid);
12391                 sp->holds_key_ref = 1;
12392         }
12393         *error = sctp_copy_one(sp, uio, resv_in_first);
12394 skip_copy:
12395         if (*error) {
12396                 sctp_free_a_strmoq(stcb, sp, SCTP_SO_LOCKED);
12397                 sp = NULL;
12398         } else {
12399                 if (sp->sinfo_flags & SCTP_ADDR_OVER) {
12400                         sp->net = net;
12401                         atomic_add_int(&sp->net->ref_count, 1);
12402                 } else {
12403                         sp->net = NULL;
12404                 }
12405                 sctp_set_prsctp_policy(sp);
12406         }
12407 out_now:
12408         return (sp);
12409 }
12410
12411
12412 int
12413 sctp_sosend(struct socket *so,
12414     struct sockaddr *addr,
12415     struct uio *uio,
12416     struct mbuf *top,
12417     struct mbuf *control,
12418     int flags,
12419     struct thread *p
12420 )
12421 {
12422         int error, use_sndinfo = 0;
12423         struct sctp_sndrcvinfo sndrcvninfo;
12424         struct sockaddr *addr_to_use;
12425 #if defined(INET) && defined(INET6)
12426         struct sockaddr_in sin;
12427 #endif
12428
12429         if (control) {
12430                 /* process cmsg snd/rcv info (maybe a assoc-id) */
12431                 if (sctp_find_cmsg(SCTP_SNDRCV, (void *)&sndrcvninfo, control,
12432                     sizeof(sndrcvninfo))) {
12433                         /* got one */
12434                         use_sndinfo = 1;
12435                 }
12436         }
12437         addr_to_use = addr;
12438 #if defined(INET) && defined(INET6)
12439         if ((addr) && (addr->sa_family == AF_INET6)) {
12440                 struct sockaddr_in6 *sin6;
12441
12442                 sin6 = (struct sockaddr_in6 *)addr;
12443                 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
12444                         in6_sin6_2_sin(&sin, sin6);
12445                         addr_to_use = (struct sockaddr *)&sin;
12446                 }
12447         }
12448 #endif
12449         error = sctp_lower_sosend(so, addr_to_use, uio, top,
12450             control,
12451             flags,
12452             use_sndinfo ? &sndrcvninfo : NULL
12453             ,p
12454             );
12455         return (error);
12456 }
12457
12458
12459 int
12460 sctp_lower_sosend(struct socket *so,
12461     struct sockaddr *addr,
12462     struct uio *uio,
12463     struct mbuf *i_pak,
12464     struct mbuf *control,
12465     int flags,
12466     struct sctp_sndrcvinfo *srcv
12467     ,
12468     struct thread *p
12469 )
12470 {
12471         struct epoch_tracker et;
12472         ssize_t sndlen = 0, max_len, local_add_more;
12473         int error, len;
12474         struct mbuf *top = NULL;
12475         int queue_only = 0, queue_only_for_init = 0;
12476         int free_cnt_applied = 0;
12477         int un_sent;
12478         int now_filled = 0;
12479         unsigned int inqueue_bytes = 0;
12480         struct sctp_block_entry be;
12481         struct sctp_inpcb *inp;
12482         struct sctp_tcb *stcb = NULL;
12483         struct timeval now;
12484         struct sctp_nets *net;
12485         struct sctp_association *asoc;
12486         struct sctp_inpcb *t_inp;
12487         int user_marks_eor;
12488         int create_lock_applied = 0;
12489         int nagle_applies = 0;
12490         int some_on_control = 0;
12491         int got_all_of_the_send = 0;
12492         int hold_tcblock = 0;
12493         int non_blocking = 0;
12494         ssize_t local_soresv = 0;
12495         uint16_t port;
12496         uint16_t sinfo_flags;
12497         sctp_assoc_t sinfo_assoc_id;
12498
12499         error = 0;
12500         net = NULL;
12501         stcb = NULL;
12502         asoc = NULL;
12503
12504         t_inp = inp = (struct sctp_inpcb *)so->so_pcb;
12505         if (inp == NULL) {
12506                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12507                 error = EINVAL;
12508                 if (i_pak) {
12509                         SCTP_RELEASE_PKT(i_pak);
12510                 }
12511                 return (error);
12512         }
12513         if ((uio == NULL) && (i_pak == NULL)) {
12514                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12515                 return (EINVAL);
12516         }
12517         user_marks_eor = sctp_is_feature_on(inp, SCTP_PCB_FLAGS_EXPLICIT_EOR);
12518         atomic_add_int(&inp->total_sends, 1);
12519         if (uio) {
12520                 if (uio->uio_resid < 0) {
12521                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12522                         return (EINVAL);
12523                 }
12524                 sndlen = uio->uio_resid;
12525         } else {
12526                 top = SCTP_HEADER_TO_CHAIN(i_pak);
12527                 sndlen = SCTP_HEADER_LEN(i_pak);
12528         }
12529         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Send called addr:%p send length %zd\n",
12530             (void *)addr,
12531             sndlen);
12532         if ((inp->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) &&
12533             SCTP_IS_LISTENING(inp)) {
12534                 /* The listener can NOT send */
12535                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOTCONN);
12536                 error = ENOTCONN;
12537                 goto out_unlocked;
12538         }
12539         /**
12540          * Pre-screen address, if one is given the sin-len
12541          * must be set correctly!
12542          */
12543         if (addr) {
12544                 union sctp_sockstore *raddr = (union sctp_sockstore *)addr;
12545
12546                 switch (raddr->sa.sa_family) {
12547 #ifdef INET
12548                 case AF_INET:
12549                         if (raddr->sin.sin_len != sizeof(struct sockaddr_in)) {
12550                                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12551                                 error = EINVAL;
12552                                 goto out_unlocked;
12553                         }
12554                         port = raddr->sin.sin_port;
12555                         break;
12556 #endif
12557 #ifdef INET6
12558                 case AF_INET6:
12559                         if (raddr->sin6.sin6_len != sizeof(struct sockaddr_in6)) {
12560                                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12561                                 error = EINVAL;
12562                                 goto out_unlocked;
12563                         }
12564                         port = raddr->sin6.sin6_port;
12565                         break;
12566 #endif
12567                 default:
12568                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EAFNOSUPPORT);
12569                         error = EAFNOSUPPORT;
12570                         goto out_unlocked;
12571                 }
12572         } else
12573                 port = 0;
12574
12575         if (srcv) {
12576                 sinfo_flags = srcv->sinfo_flags;
12577                 sinfo_assoc_id = srcv->sinfo_assoc_id;
12578                 if (INVALID_SINFO_FLAG(sinfo_flags) ||
12579                     PR_SCTP_INVALID_POLICY(sinfo_flags)) {
12580                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12581                         error = EINVAL;
12582                         goto out_unlocked;
12583                 }
12584                 if (srcv->sinfo_flags)
12585                         SCTP_STAT_INCR(sctps_sends_with_flags);
12586         } else {
12587                 sinfo_flags = inp->def_send.sinfo_flags;
12588                 sinfo_assoc_id = inp->def_send.sinfo_assoc_id;
12589         }
12590         if (flags & MSG_EOR) {
12591                 sinfo_flags |= SCTP_EOR;
12592         }
12593         if (flags & MSG_EOF) {
12594                 sinfo_flags |= SCTP_EOF;
12595         }
12596         if (sinfo_flags & SCTP_SENDALL) {
12597                 /* its a sendall */
12598                 error = sctp_sendall(inp, uio, top, srcv);
12599                 top = NULL;
12600                 goto out_unlocked;
12601         }
12602         if ((sinfo_flags & SCTP_ADDR_OVER) && (addr == NULL)) {
12603                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12604                 error = EINVAL;
12605                 goto out_unlocked;
12606         }
12607         /* now we must find the assoc */
12608         if ((inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) ||
12609             (inp->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) {
12610                 SCTP_INP_RLOCK(inp);
12611                 stcb = LIST_FIRST(&inp->sctp_asoc_list);
12612                 if (stcb) {
12613                         SCTP_TCB_LOCK(stcb);
12614                         hold_tcblock = 1;
12615                 }
12616                 SCTP_INP_RUNLOCK(inp);
12617         } else if (sinfo_assoc_id) {
12618                 stcb = sctp_findassociation_ep_asocid(inp, sinfo_assoc_id, 1);
12619                 if (stcb != NULL) {
12620                         hold_tcblock = 1;
12621                 }
12622         } else if (addr) {
12623                 /*-
12624                  * Since we did not use findep we must
12625                  * increment it, and if we don't find a tcb
12626                  * decrement it.
12627                  */
12628                 SCTP_INP_WLOCK(inp);
12629                 SCTP_INP_INCR_REF(inp);
12630                 SCTP_INP_WUNLOCK(inp);
12631                 stcb = sctp_findassociation_ep_addr(&t_inp, addr, &net, NULL, NULL);
12632                 if (stcb == NULL) {
12633                         SCTP_INP_WLOCK(inp);
12634                         SCTP_INP_DECR_REF(inp);
12635                         SCTP_INP_WUNLOCK(inp);
12636                 } else {
12637                         hold_tcblock = 1;
12638                 }
12639         }
12640         if ((stcb == NULL) && (addr)) {
12641                 /* Possible implicit send? */
12642                 SCTP_ASOC_CREATE_LOCK(inp);
12643                 create_lock_applied = 1;
12644                 if ((inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) ||
12645                     (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE)) {
12646                         /* Should I really unlock ? */
12647                         SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12648                         error = EINVAL;
12649                         goto out_unlocked;
12650
12651                 }
12652                 if (((inp->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) == 0) &&
12653                     (addr->sa_family == AF_INET6)) {
12654                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12655                         error = EINVAL;
12656                         goto out_unlocked;
12657                 }
12658                 SCTP_INP_WLOCK(inp);
12659                 SCTP_INP_INCR_REF(inp);
12660                 SCTP_INP_WUNLOCK(inp);
12661                 /* With the lock applied look again */
12662                 stcb = sctp_findassociation_ep_addr(&t_inp, addr, &net, NULL, NULL);
12663 #if defined(INET) || defined(INET6)
12664                 if ((stcb == NULL) && (control != NULL) && (port > 0)) {
12665                         stcb = sctp_findassociation_cmsgs(&t_inp, port, control, &net, &error);
12666                 }
12667 #endif
12668                 if (stcb == NULL) {
12669                         SCTP_INP_WLOCK(inp);
12670                         SCTP_INP_DECR_REF(inp);
12671                         SCTP_INP_WUNLOCK(inp);
12672                 } else {
12673                         hold_tcblock = 1;
12674                 }
12675                 if (error) {
12676                         goto out_unlocked;
12677                 }
12678                 if (t_inp != inp) {
12679                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOTCONN);
12680                         error = ENOTCONN;
12681                         goto out_unlocked;
12682                 }
12683         }
12684         if (stcb == NULL) {
12685                 if (addr == NULL) {
12686                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOENT);
12687                         error = ENOENT;
12688                         goto out_unlocked;
12689                 } else {
12690                         /* We must go ahead and start the INIT process */
12691                         uint32_t vrf_id;
12692
12693                         if ((sinfo_flags & SCTP_ABORT) ||
12694                             ((sinfo_flags & SCTP_EOF) && (sndlen == 0))) {
12695                                 /*-
12696                                  * User asks to abort a non-existant assoc,
12697                                  * or EOF a non-existant assoc with no data
12698                                  */
12699                                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOENT);
12700                                 error = ENOENT;
12701                                 goto out_unlocked;
12702                         }
12703                         /* get an asoc/stcb struct */
12704                         vrf_id = inp->def_vrf_id;
12705 #ifdef INVARIANTS
12706                         if (create_lock_applied == 0) {
12707                                 panic("Error, should hold create lock and I don't?");
12708                         }
12709 #endif
12710                         stcb = sctp_aloc_assoc(inp, addr, &error, 0, vrf_id,
12711                             inp->sctp_ep.pre_open_stream_count,
12712                             inp->sctp_ep.port,
12713                             p,
12714                             SCTP_INITIALIZE_AUTH_PARAMS);
12715                         if (stcb == NULL) {
12716                                 /* Error is setup for us in the call */
12717                                 goto out_unlocked;
12718                         }
12719                         if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) {
12720                                 stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED;
12721                                 /*
12722                                  * Set the connected flag so we can queue
12723                                  * data
12724                                  */
12725                                 soisconnecting(so);
12726                         }
12727                         hold_tcblock = 1;
12728                         if (create_lock_applied) {
12729                                 SCTP_ASOC_CREATE_UNLOCK(inp);
12730                                 create_lock_applied = 0;
12731                         } else {
12732                                 SCTP_PRINTF("Huh-3? create lock should have been on??\n");
12733                         }
12734                         /*
12735                          * Turn on queue only flag to prevent data from
12736                          * being sent
12737                          */
12738                         queue_only = 1;
12739                         asoc = &stcb->asoc;
12740                         SCTP_SET_STATE(stcb, SCTP_STATE_COOKIE_WAIT);
12741                         (void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered);
12742
12743                         if (control) {
12744                                 if (sctp_process_cmsgs_for_init(stcb, control, &error)) {
12745                                         sctp_free_assoc(inp, stcb, SCTP_PCBFREE_FORCE,
12746                                             SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_6);
12747                                         hold_tcblock = 0;
12748                                         stcb = NULL;
12749                                         goto out_unlocked;
12750                                 }
12751                         }
12752                         /* out with the INIT */
12753                         queue_only_for_init = 1;
12754                         /*-
12755                          * we may want to dig in after this call and adjust the MTU
12756                          * value. It defaulted to 1500 (constant) but the ro
12757                          * structure may now have an update and thus we may need to
12758                          * change it BEFORE we append the message.
12759                          */
12760                 }
12761         } else
12762                 asoc = &stcb->asoc;
12763         if (srcv == NULL) {
12764                 srcv = (struct sctp_sndrcvinfo *)&asoc->def_send;
12765                 sinfo_flags = srcv->sinfo_flags;
12766                 if (flags & MSG_EOR) {
12767                         sinfo_flags |= SCTP_EOR;
12768                 }
12769                 if (flags & MSG_EOF) {
12770                         sinfo_flags |= SCTP_EOF;
12771                 }
12772         }
12773         if (sinfo_flags & SCTP_ADDR_OVER) {
12774                 if (addr)
12775                         net = sctp_findnet(stcb, addr);
12776                 else
12777                         net = NULL;
12778                 if ((net == NULL) ||
12779                     ((port != 0) && (port != stcb->rport))) {
12780                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12781                         error = EINVAL;
12782                         goto out_unlocked;
12783                 }
12784         } else {
12785                 if (stcb->asoc.alternate) {
12786                         net = stcb->asoc.alternate;
12787                 } else {
12788                         net = stcb->asoc.primary_destination;
12789                 }
12790         }
12791         atomic_add_int(&stcb->total_sends, 1);
12792         /* Keep the stcb from being freed under our feet */
12793         atomic_add_int(&asoc->refcnt, 1);
12794         free_cnt_applied = 1;
12795
12796         if (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_NO_FRAGMENT)) {
12797                 if (sndlen > (ssize_t)asoc->smallest_mtu) {
12798                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EMSGSIZE);
12799                         error = EMSGSIZE;
12800                         goto out_unlocked;
12801                 }
12802         }
12803         if (SCTP_SO_IS_NBIO(so)
12804             || (flags & (MSG_NBIO | MSG_DONTWAIT)) != 0
12805             ) {
12806                 non_blocking = 1;
12807         }
12808         /* would we block? */
12809         if (non_blocking) {
12810                 ssize_t amount;
12811
12812                 if (hold_tcblock == 0) {
12813                         SCTP_TCB_LOCK(stcb);
12814                         hold_tcblock = 1;
12815                 }
12816                 inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * SCTP_DATA_CHUNK_OVERHEAD(stcb));
12817                 if (user_marks_eor == 0) {
12818                         amount = sndlen;
12819                 } else {
12820                         amount = 1;
12821                 }
12822                 if ((SCTP_SB_LIMIT_SND(so) < (amount + inqueue_bytes + stcb->asoc.sb_send_resv)) ||
12823                     (stcb->asoc.chunks_on_out_queue >= SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue))) {
12824                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EWOULDBLOCK);
12825                         if (sndlen > (ssize_t)SCTP_SB_LIMIT_SND(so))
12826                                 error = EMSGSIZE;
12827                         else
12828                                 error = EWOULDBLOCK;
12829                         goto out_unlocked;
12830                 }
12831                 stcb->asoc.sb_send_resv += (uint32_t)sndlen;
12832                 SCTP_TCB_UNLOCK(stcb);
12833                 hold_tcblock = 0;
12834         } else {
12835                 atomic_add_int(&stcb->asoc.sb_send_resv, sndlen);
12836         }
12837         local_soresv = sndlen;
12838         if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
12839                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
12840                 error = ECONNRESET;
12841                 goto out_unlocked;
12842         }
12843         if (create_lock_applied) {
12844                 SCTP_ASOC_CREATE_UNLOCK(inp);
12845                 create_lock_applied = 0;
12846         }
12847         /* Is the stream no. valid? */
12848         if (srcv->sinfo_stream >= asoc->streamoutcnt) {
12849                 /* Invalid stream number */
12850                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12851                 error = EINVAL;
12852                 goto out_unlocked;
12853         }
12854         if ((asoc->strmout[srcv->sinfo_stream].state != SCTP_STREAM_OPEN) &&
12855             (asoc->strmout[srcv->sinfo_stream].state != SCTP_STREAM_OPENING)) {
12856                 /*
12857                  * Can't queue any data while stream reset is underway.
12858                  */
12859                 if (asoc->strmout[srcv->sinfo_stream].state > SCTP_STREAM_OPEN) {
12860                         error = EAGAIN;
12861                 } else {
12862                         error = EINVAL;
12863                 }
12864                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, error);
12865                 goto out_unlocked;
12866         }
12867         if ((SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_WAIT) ||
12868             (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)) {
12869                 queue_only = 1;
12870         }
12871         /* we are now done with all control */
12872         if (control) {
12873                 sctp_m_freem(control);
12874                 control = NULL;
12875         }
12876         if ((SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_SENT) ||
12877             (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_RECEIVED) ||
12878             (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_ACK_SENT) ||
12879             (asoc->state & SCTP_STATE_SHUTDOWN_PENDING)) {
12880                 if (sinfo_flags & SCTP_ABORT) {
12881                         ;
12882                 } else {
12883                         SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
12884                         error = ECONNRESET;
12885                         goto out_unlocked;
12886                 }
12887         }
12888         /* Ok, we will attempt a msgsnd :> */
12889         if (p) {
12890                 p->td_ru.ru_msgsnd++;
12891         }
12892         /* Are we aborting? */
12893         if (sinfo_flags & SCTP_ABORT) {
12894                 struct mbuf *mm;
12895                 ssize_t tot_demand, tot_out = 0, max_out;
12896
12897                 SCTP_STAT_INCR(sctps_sends_with_abort);
12898                 if ((SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_WAIT) ||
12899                     (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)) {
12900                         /* It has to be up before we abort */
12901                         /* how big is the user initiated abort? */
12902                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12903                         error = EINVAL;
12904                         goto out;
12905                 }
12906                 if (hold_tcblock) {
12907                         SCTP_TCB_UNLOCK(stcb);
12908                         hold_tcblock = 0;
12909                 }
12910                 if (top) {
12911                         struct mbuf *cntm = NULL;
12912
12913                         mm = sctp_get_mbuf_for_msg(sizeof(struct sctp_paramhdr), 0, M_WAITOK, 1, MT_DATA);
12914                         if (sndlen != 0) {
12915                                 for (cntm = top; cntm; cntm = SCTP_BUF_NEXT(cntm)) {
12916                                         tot_out += SCTP_BUF_LEN(cntm);
12917                                 }
12918                         }
12919                 } else {
12920                         /* Must fit in a MTU */
12921                         tot_out = sndlen;
12922                         tot_demand = (tot_out + sizeof(struct sctp_paramhdr));
12923                         if (tot_demand > SCTP_DEFAULT_ADD_MORE) {
12924                                 /* To big */
12925                                 SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EMSGSIZE);
12926                                 error = EMSGSIZE;
12927                                 goto out;
12928                         }
12929                         mm = sctp_get_mbuf_for_msg((unsigned int)tot_demand, 0, M_WAITOK, 1, MT_DATA);
12930                 }
12931                 if (mm == NULL) {
12932                         SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12933                         error = ENOMEM;
12934                         goto out;
12935                 }
12936                 max_out = asoc->smallest_mtu - sizeof(struct sctp_paramhdr);
12937                 max_out -= sizeof(struct sctp_abort_msg);
12938                 if (tot_out > max_out) {
12939                         tot_out = max_out;
12940                 }
12941                 if (mm) {
12942                         struct sctp_paramhdr *ph;
12943
12944                         /* now move forward the data pointer */
12945                         ph = mtod(mm, struct sctp_paramhdr *);
12946                         ph->param_type = htons(SCTP_CAUSE_USER_INITIATED_ABT);
12947                         ph->param_length = htons((uint16_t)(sizeof(struct sctp_paramhdr) + tot_out));
12948                         ph++;
12949                         SCTP_BUF_LEN(mm) = (int)(tot_out + sizeof(struct sctp_paramhdr));
12950                         if (top == NULL) {
12951                                 error = uiomove((caddr_t)ph, (int)tot_out, uio);
12952                                 if (error) {
12953                                         /*-
12954                                          * Here if we can't get his data we
12955                                          * still abort we just don't get to
12956                                          * send the users note :-0
12957                                          */
12958                                         sctp_m_freem(mm);
12959                                         mm = NULL;
12960                                 }
12961                         } else {
12962                                 if (sndlen != 0) {
12963                                         SCTP_BUF_NEXT(mm) = top;
12964                                 }
12965                         }
12966                 }
12967                 if (hold_tcblock == 0) {
12968                         SCTP_TCB_LOCK(stcb);
12969                 }
12970                 atomic_add_int(&stcb->asoc.refcnt, -1);
12971                 free_cnt_applied = 0;
12972                 /* release this lock, otherwise we hang on ourselves */
12973                 NET_EPOCH_ENTER(et);
12974                 sctp_abort_an_association(stcb->sctp_ep, stcb, mm, SCTP_SO_LOCKED);
12975                 NET_EPOCH_EXIT(et);
12976                 /* now relock the stcb so everything is sane */
12977                 hold_tcblock = 0;
12978                 stcb = NULL;
12979                 /*
12980                  * In this case top is already chained to mm avoid double
12981                  * free, since we free it below if top != NULL and driver
12982                  * would free it after sending the packet out
12983                  */
12984                 if (sndlen != 0) {
12985                         top = NULL;
12986                 }
12987                 goto out_unlocked;
12988         }
12989         /* Calculate the maximum we can send */
12990         inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * SCTP_DATA_CHUNK_OVERHEAD(stcb));
12991         if (SCTP_SB_LIMIT_SND(so) > inqueue_bytes) {
12992                 max_len = SCTP_SB_LIMIT_SND(so) - inqueue_bytes;
12993         } else {
12994                 max_len = 0;
12995         }
12996         if (hold_tcblock) {
12997                 SCTP_TCB_UNLOCK(stcb);
12998                 hold_tcblock = 0;
12999         }
13000         if (asoc->strmout == NULL) {
13001                 /* huh? software error */
13002                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EFAULT);
13003                 error = EFAULT;
13004                 goto out_unlocked;
13005         }
13006
13007         /* Unless E_EOR mode is on, we must make a send FIT in one call. */
13008         if ((user_marks_eor == 0) &&
13009             (sndlen > (ssize_t)SCTP_SB_LIMIT_SND(stcb->sctp_socket))) {
13010                 /* It will NEVER fit */
13011                 SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EMSGSIZE);
13012                 error = EMSGSIZE;
13013                 goto out_unlocked;
13014         }
13015         if ((uio == NULL) && user_marks_eor) {
13016                 /*-
13017                  * We do not support eeor mode for
13018                  * sending with mbuf chains (like sendfile).
13019                  */
13020                 SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
13021                 error = EINVAL;
13022                 goto out_unlocked;
13023         }
13024
13025         if (user_marks_eor) {
13026                 local_add_more = (ssize_t)min(SCTP_SB_LIMIT_SND(so), SCTP_BASE_SYSCTL(sctp_add_more_threshold));
13027         } else {
13028                 /*-
13029                  * For non-eeor the whole message must fit in
13030                  * the socket send buffer.
13031                  */
13032                 local_add_more = sndlen;
13033         }
13034         len = 0;
13035         if (non_blocking) {
13036                 goto skip_preblock;
13037         }
13038         if (((max_len <= local_add_more) &&
13039             ((ssize_t)SCTP_SB_LIMIT_SND(so) >= local_add_more)) ||
13040             (max_len == 0) ||
13041             ((stcb->asoc.chunks_on_out_queue + stcb->asoc.stream_queue_cnt) >= SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue))) {
13042                 /* No room right now ! */
13043                 SOCKBUF_LOCK(&so->so_snd);
13044                 inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * SCTP_DATA_CHUNK_OVERHEAD(stcb));
13045                 while ((SCTP_SB_LIMIT_SND(so) < (inqueue_bytes + local_add_more)) ||
13046                     ((stcb->asoc.stream_queue_cnt + stcb->asoc.chunks_on_out_queue) >= SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue))) {
13047                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "pre_block limit:%u <(inq:%d + %zd) || (%d+%d > %d)\n",
13048                             (unsigned int)SCTP_SB_LIMIT_SND(so),
13049                             inqueue_bytes,
13050                             local_add_more,
13051                             stcb->asoc.stream_queue_cnt,
13052                             stcb->asoc.chunks_on_out_queue,
13053                             SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue));
13054                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13055                                 sctp_log_block(SCTP_BLOCK_LOG_INTO_BLKA, asoc, sndlen);
13056                         }
13057                         be.error = 0;
13058                         stcb->block_entry = &be;
13059                         error = sbwait(&so->so_snd);
13060                         stcb->block_entry = NULL;
13061                         if (error || so->so_error || be.error) {
13062                                 if (error == 0) {
13063                                         if (so->so_error)
13064                                                 error = so->so_error;
13065                                         if (be.error) {
13066                                                 error = be.error;
13067                                         }
13068                                 }
13069                                 SOCKBUF_UNLOCK(&so->so_snd);
13070                                 goto out_unlocked;
13071                         }
13072                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13073                                 sctp_log_block(SCTP_BLOCK_LOG_OUTOF_BLK,
13074                                     asoc, stcb->asoc.total_output_queue_size);
13075                         }
13076                         if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
13077                                 SOCKBUF_UNLOCK(&so->so_snd);
13078                                 goto out_unlocked;
13079                         }
13080                         inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * SCTP_DATA_CHUNK_OVERHEAD(stcb));
13081                 }
13082                 if (SCTP_SB_LIMIT_SND(so) > inqueue_bytes) {
13083                         max_len = SCTP_SB_LIMIT_SND(so) - inqueue_bytes;
13084                 } else {
13085                         max_len = 0;
13086                 }
13087                 SOCKBUF_UNLOCK(&so->so_snd);
13088         }
13089
13090 skip_preblock:
13091         if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
13092                 goto out_unlocked;
13093         }
13094         /*
13095          * sndlen covers for mbuf case uio_resid covers for the non-mbuf
13096          * case NOTE: uio will be null when top/mbuf is passed
13097          */
13098         if (sndlen == 0) {
13099                 if (sinfo_flags & SCTP_EOF) {
13100                         got_all_of_the_send = 1;
13101                         goto dataless_eof;
13102                 } else {
13103                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
13104                         error = EINVAL;
13105                         goto out;
13106                 }
13107         }
13108         if (top == NULL) {
13109                 struct sctp_stream_queue_pending *sp;
13110                 struct sctp_stream_out *strm;
13111                 uint32_t sndout;
13112
13113                 SCTP_TCB_SEND_LOCK(stcb);
13114                 if ((asoc->stream_locked) &&
13115                     (asoc->stream_locked_on != srcv->sinfo_stream)) {
13116                         SCTP_TCB_SEND_UNLOCK(stcb);
13117                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
13118                         error = EINVAL;
13119                         goto out;
13120                 }
13121                 SCTP_TCB_SEND_UNLOCK(stcb);
13122
13123                 strm = &stcb->asoc.strmout[srcv->sinfo_stream];
13124                 if (strm->last_msg_incomplete == 0) {
13125         do_a_copy_in:
13126                         sp = sctp_copy_it_in(stcb, asoc, srcv, uio, net, max_len, user_marks_eor, &error);
13127                         if (error) {
13128                                 goto out;
13129                         }
13130                         SCTP_TCB_SEND_LOCK(stcb);
13131                         if (sp->msg_is_complete) {
13132                                 strm->last_msg_incomplete = 0;
13133                                 asoc->stream_locked = 0;
13134                         } else {
13135                                 /*
13136                                  * Just got locked to this guy in case of an
13137                                  * interrupt.
13138                                  */
13139                                 strm->last_msg_incomplete = 1;
13140                                 if (stcb->asoc.idata_supported == 0) {
13141                                         asoc->stream_locked = 1;
13142                                         asoc->stream_locked_on = srcv->sinfo_stream;
13143                                 }
13144                                 sp->sender_all_done = 0;
13145                         }
13146                         sctp_snd_sb_alloc(stcb, sp->length);
13147                         atomic_add_int(&asoc->stream_queue_cnt, 1);
13148                         if (sinfo_flags & SCTP_UNORDERED) {
13149                                 SCTP_STAT_INCR(sctps_sends_with_unord);
13150                         }
13151                         TAILQ_INSERT_TAIL(&strm->outqueue, sp, next);
13152                         stcb->asoc.ss_functions.sctp_ss_add_to_stream(stcb, asoc, strm, sp, 1);
13153                         SCTP_TCB_SEND_UNLOCK(stcb);
13154                 } else {
13155                         SCTP_TCB_SEND_LOCK(stcb);
13156                         sp = TAILQ_LAST(&strm->outqueue, sctp_streamhead);
13157                         SCTP_TCB_SEND_UNLOCK(stcb);
13158                         if (sp == NULL) {
13159                                 /* ???? Huh ??? last msg is gone */
13160 #ifdef INVARIANTS
13161                                 panic("Warning: Last msg marked incomplete, yet nothing left?");
13162 #else
13163                                 SCTP_PRINTF("Warning: Last msg marked incomplete, yet nothing left?\n");
13164                                 strm->last_msg_incomplete = 0;
13165 #endif
13166                                 goto do_a_copy_in;
13167
13168                         }
13169                 }
13170                 while (uio->uio_resid > 0) {
13171                         /* How much room do we have? */
13172                         struct mbuf *new_tail, *mm;
13173
13174                         inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * SCTP_DATA_CHUNK_OVERHEAD(stcb));
13175                         if (SCTP_SB_LIMIT_SND(so) > inqueue_bytes)
13176                                 max_len = SCTP_SB_LIMIT_SND(so) - inqueue_bytes;
13177                         else
13178                                 max_len = 0;
13179
13180                         if ((max_len > (ssize_t)SCTP_BASE_SYSCTL(sctp_add_more_threshold)) ||
13181                             (max_len && (SCTP_SB_LIMIT_SND(so) < SCTP_BASE_SYSCTL(sctp_add_more_threshold))) ||
13182                             (uio->uio_resid && (uio->uio_resid <= max_len))) {
13183                                 sndout = 0;
13184                                 new_tail = NULL;
13185                                 if (hold_tcblock) {
13186                                         SCTP_TCB_UNLOCK(stcb);
13187                                         hold_tcblock = 0;
13188                                 }
13189                                 mm = sctp_copy_resume(uio, (int)max_len, user_marks_eor, &error, &sndout, &new_tail);
13190                                 if ((mm == NULL) || error) {
13191                                         if (mm) {
13192                                                 sctp_m_freem(mm);
13193                                         }
13194                                         goto out;
13195                                 }
13196                                 /* Update the mbuf and count */
13197                                 SCTP_TCB_SEND_LOCK(stcb);
13198                                 if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
13199                                         /*
13200                                          * we need to get out. Peer probably
13201                                          * aborted.
13202                                          */
13203                                         sctp_m_freem(mm);
13204                                         if (stcb->asoc.state & SCTP_PCB_FLAGS_WAS_ABORTED) {
13205                                                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
13206                                                 error = ECONNRESET;
13207                                         }
13208                                         SCTP_TCB_SEND_UNLOCK(stcb);
13209                                         goto out;
13210                                 }
13211                                 if (sp->tail_mbuf) {
13212                                         /* tack it to the end */
13213                                         SCTP_BUF_NEXT(sp->tail_mbuf) = mm;
13214                                         sp->tail_mbuf = new_tail;
13215                                 } else {
13216                                         /* A stolen mbuf */
13217                                         sp->data = mm;
13218                                         sp->tail_mbuf = new_tail;
13219                                 }
13220                                 sctp_snd_sb_alloc(stcb, sndout);
13221                                 atomic_add_int(&sp->length, sndout);
13222                                 len += sndout;
13223                                 if (sinfo_flags & SCTP_SACK_IMMEDIATELY) {
13224                                         sp->sinfo_flags |= SCTP_SACK_IMMEDIATELY;
13225                                 }
13226
13227                                 /* Did we reach EOR? */
13228                                 if ((uio->uio_resid == 0) &&
13229                                     ((user_marks_eor == 0) ||
13230                                     (sinfo_flags & SCTP_EOF) ||
13231                                     (user_marks_eor && (sinfo_flags & SCTP_EOR)))) {
13232                                         sp->msg_is_complete = 1;
13233                                 } else {
13234                                         sp->msg_is_complete = 0;
13235                                 }
13236                                 SCTP_TCB_SEND_UNLOCK(stcb);
13237                         }
13238                         if (uio->uio_resid == 0) {
13239                                 /* got it all? */
13240                                 continue;
13241                         }
13242                         /* PR-SCTP? */
13243                         if ((asoc->prsctp_supported) && (asoc->sent_queue_cnt_removeable > 0)) {
13244                                 /*
13245                                  * This is ugly but we must assure locking
13246                                  * order
13247                                  */
13248                                 if (hold_tcblock == 0) {
13249                                         SCTP_TCB_LOCK(stcb);
13250                                         hold_tcblock = 1;
13251                                 }
13252                                 sctp_prune_prsctp(stcb, asoc, srcv, (int)sndlen);
13253                                 inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * SCTP_DATA_CHUNK_OVERHEAD(stcb));
13254                                 if (SCTP_SB_LIMIT_SND(so) > inqueue_bytes)
13255                                         max_len = SCTP_SB_LIMIT_SND(so) - inqueue_bytes;
13256                                 else
13257                                         max_len = 0;
13258                                 if (max_len > 0) {
13259                                         continue;
13260                                 }
13261                                 SCTP_TCB_UNLOCK(stcb);
13262                                 hold_tcblock = 0;
13263                         }
13264                         /* wait for space now */
13265                         if (non_blocking) {
13266                                 /* Non-blocking io in place out */
13267                                 goto skip_out_eof;
13268                         }
13269                         /* What about the INIT, send it maybe */
13270                         if (queue_only_for_init) {
13271                                 if (hold_tcblock == 0) {
13272                                         SCTP_TCB_LOCK(stcb);
13273                                         hold_tcblock = 1;
13274                                 }
13275                                 if (SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) {
13276                                         /* a collision took us forward? */
13277                                         queue_only = 0;
13278                                 } else {
13279                                         NET_EPOCH_ENTER(et);
13280                                         sctp_send_initiate(inp, stcb, SCTP_SO_LOCKED);
13281                                         NET_EPOCH_EXIT(et);
13282                                         SCTP_SET_STATE(stcb, SCTP_STATE_COOKIE_WAIT);
13283                                         queue_only = 1;
13284                                 }
13285                         }
13286                         if ((net->flight_size > net->cwnd) &&
13287                             (asoc->sctp_cmt_on_off == 0)) {
13288                                 SCTP_STAT_INCR(sctps_send_cwnd_avoid);
13289                                 queue_only = 1;
13290                         } else if (asoc->ifp_had_enobuf) {
13291                                 SCTP_STAT_INCR(sctps_ifnomemqueued);
13292                                 if (net->flight_size > (2 * net->mtu)) {
13293                                         queue_only = 1;
13294                                 }
13295                                 asoc->ifp_had_enobuf = 0;
13296                         }
13297                         un_sent = stcb->asoc.total_output_queue_size - stcb->asoc.total_flight;
13298                         if ((sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY)) &&
13299                             (stcb->asoc.total_flight > 0) &&
13300                             (stcb->asoc.stream_queue_cnt < SCTP_MAX_DATA_BUNDLING) &&
13301                             (un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD))) {
13302
13303                                 /*-
13304                                  * Ok, Nagle is set on and we have data outstanding.
13305                                  * Don't send anything and let SACKs drive out the
13306                                  * data unless we have a "full" segment to send.
13307                                  */
13308                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
13309                                         sctp_log_nagle_event(stcb, SCTP_NAGLE_APPLIED);
13310                                 }
13311                                 SCTP_STAT_INCR(sctps_naglequeued);
13312                                 nagle_applies = 1;
13313                         } else {
13314                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
13315                                         if (sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY))
13316                                                 sctp_log_nagle_event(stcb, SCTP_NAGLE_SKIPPED);
13317                                 }
13318                                 SCTP_STAT_INCR(sctps_naglesent);
13319                                 nagle_applies = 0;
13320                         }
13321                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13322
13323                                 sctp_misc_ints(SCTP_CWNDLOG_PRESEND, queue_only_for_init, queue_only,
13324                                     nagle_applies, un_sent);
13325                                 sctp_misc_ints(SCTP_CWNDLOG_PRESEND, stcb->asoc.total_output_queue_size,
13326                                     stcb->asoc.total_flight,
13327                                     stcb->asoc.chunks_on_out_queue, stcb->asoc.total_flight_count);
13328                         }
13329                         if (queue_only_for_init)
13330                                 queue_only_for_init = 0;
13331                         if ((queue_only == 0) && (nagle_applies == 0)) {
13332                                 /*-
13333                                  * need to start chunk output
13334                                  * before blocking.. note that if
13335                                  * a lock is already applied, then
13336                                  * the input via the net is happening
13337                                  * and I don't need to start output :-D
13338                                  */
13339                                 NET_EPOCH_ENTER(et);
13340                                 if (hold_tcblock == 0) {
13341                                         if (SCTP_TCB_TRYLOCK(stcb)) {
13342                                                 hold_tcblock = 1;
13343                                                 sctp_chunk_output(inp,
13344                                                     stcb,
13345                                                     SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13346                                         }
13347                                 } else {
13348                                         sctp_chunk_output(inp,
13349                                             stcb,
13350                                             SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13351                                 }
13352                                 NET_EPOCH_EXIT(et);
13353                         }
13354                         if (hold_tcblock == 1) {
13355                                 SCTP_TCB_UNLOCK(stcb);
13356                                 hold_tcblock = 0;
13357                         }
13358                         SOCKBUF_LOCK(&so->so_snd);
13359                         /*-
13360                          * This is a bit strange, but I think it will
13361                          * work. The total_output_queue_size is locked and
13362                          * protected by the TCB_LOCK, which we just released.
13363                          * There is a race that can occur between releasing it
13364                          * above, and me getting the socket lock, where sacks
13365                          * come in but we have not put the SB_WAIT on the
13366                          * so_snd buffer to get the wakeup. After the LOCK
13367                          * is applied the sack_processing will also need to
13368                          * LOCK the so->so_snd to do the actual sowwakeup(). So
13369                          * once we have the socket buffer lock if we recheck the
13370                          * size we KNOW we will get to sleep safely with the
13371                          * wakeup flag in place.
13372                          */
13373                         inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * SCTP_DATA_CHUNK_OVERHEAD(stcb));
13374                         if (SCTP_SB_LIMIT_SND(so) <= (inqueue_bytes +
13375                             min(SCTP_BASE_SYSCTL(sctp_add_more_threshold), SCTP_SB_LIMIT_SND(so)))) {
13376                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13377                                         sctp_log_block(SCTP_BLOCK_LOG_INTO_BLK,
13378                                             asoc, uio->uio_resid);
13379                                 }
13380                                 be.error = 0;
13381                                 stcb->block_entry = &be;
13382                                 error = sbwait(&so->so_snd);
13383                                 stcb->block_entry = NULL;
13384
13385                                 if (error || so->so_error || be.error) {
13386                                         if (error == 0) {
13387                                                 if (so->so_error)
13388                                                         error = so->so_error;
13389                                                 if (be.error) {
13390                                                         error = be.error;
13391                                                 }
13392                                         }
13393                                         SOCKBUF_UNLOCK(&so->so_snd);
13394                                         goto out_unlocked;
13395                                 }
13396
13397                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13398                                         sctp_log_block(SCTP_BLOCK_LOG_OUTOF_BLK,
13399                                             asoc, stcb->asoc.total_output_queue_size);
13400                                 }
13401                         }
13402                         SOCKBUF_UNLOCK(&so->so_snd);
13403                         if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
13404                                 goto out_unlocked;
13405                         }
13406                 }
13407                 SCTP_TCB_SEND_LOCK(stcb);
13408                 if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
13409                         SCTP_TCB_SEND_UNLOCK(stcb);
13410                         goto out_unlocked;
13411                 }
13412                 if (sp) {
13413                         if (sp->msg_is_complete == 0) {
13414                                 strm->last_msg_incomplete = 1;
13415                                 if (stcb->asoc.idata_supported == 0) {
13416                                         asoc->stream_locked = 1;
13417                                         asoc->stream_locked_on = srcv->sinfo_stream;
13418                                 }
13419                         } else {
13420                                 sp->sender_all_done = 1;
13421                                 strm->last_msg_incomplete = 0;
13422                                 asoc->stream_locked = 0;
13423                         }
13424                 } else {
13425                         SCTP_PRINTF("Huh no sp TSNH?\n");
13426                         strm->last_msg_incomplete = 0;
13427                         asoc->stream_locked = 0;
13428                 }
13429                 SCTP_TCB_SEND_UNLOCK(stcb);
13430                 if (uio->uio_resid == 0) {
13431                         got_all_of_the_send = 1;
13432                 }
13433         } else {
13434                 /* We send in a 0, since we do NOT have any locks */
13435                 error = sctp_msg_append(stcb, net, top, srcv, 0);
13436                 top = NULL;
13437                 if (sinfo_flags & SCTP_EOF) {
13438                         got_all_of_the_send = 1;
13439                 }
13440         }
13441         if (error) {
13442                 goto out;
13443         }
13444 dataless_eof:
13445         /* EOF thing ? */
13446         if ((sinfo_flags & SCTP_EOF) &&
13447             (got_all_of_the_send == 1)) {
13448                 SCTP_STAT_INCR(sctps_sends_with_eof);
13449                 error = 0;
13450                 if (hold_tcblock == 0) {
13451                         SCTP_TCB_LOCK(stcb);
13452                         hold_tcblock = 1;
13453                 }
13454                 if (TAILQ_EMPTY(&asoc->send_queue) &&
13455                     TAILQ_EMPTY(&asoc->sent_queue) &&
13456                     sctp_is_there_unsent_data(stcb, SCTP_SO_LOCKED) == 0) {
13457                         if ((*asoc->ss_functions.sctp_ss_is_user_msgs_incomplete) (stcb, asoc)) {
13458                                 goto abort_anyway;
13459                         }
13460                         /* there is nothing queued to send, so I'm done... */
13461                         if ((SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_SENT) &&
13462                             (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
13463                             (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
13464                                 struct sctp_nets *netp;
13465
13466                                 /* only send SHUTDOWN the first time through */
13467                                 if (SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) {
13468                                         SCTP_STAT_DECR_GAUGE32(sctps_currestab);
13469                                 }
13470                                 SCTP_SET_STATE(stcb, SCTP_STATE_SHUTDOWN_SENT);
13471                                 sctp_stop_timers_for_shutdown(stcb);
13472                                 if (stcb->asoc.alternate) {
13473                                         netp = stcb->asoc.alternate;
13474                                 } else {
13475                                         netp = stcb->asoc.primary_destination;
13476                                 }
13477                                 sctp_send_shutdown(stcb, netp);
13478                                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb,
13479                                     netp);
13480                                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
13481                                     NULL);
13482                         }
13483                 } else {
13484                         /*-
13485                          * we still got (or just got) data to send, so set
13486                          * SHUTDOWN_PENDING
13487                          */
13488                         /*-
13489                          * XXX sockets draft says that SCTP_EOF should be
13490                          * sent with no data.  currently, we will allow user
13491                          * data to be sent first and move to
13492                          * SHUTDOWN-PENDING
13493                          */
13494                         if ((SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_SENT) &&
13495                             (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
13496                             (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
13497                                 if (hold_tcblock == 0) {
13498                                         SCTP_TCB_LOCK(stcb);
13499                                         hold_tcblock = 1;
13500                                 }
13501                                 if ((*asoc->ss_functions.sctp_ss_is_user_msgs_incomplete) (stcb, asoc)) {
13502                                         SCTP_ADD_SUBSTATE(stcb, SCTP_STATE_PARTIAL_MSG_LEFT);
13503                                 }
13504                                 SCTP_ADD_SUBSTATE(stcb, SCTP_STATE_SHUTDOWN_PENDING);
13505                                 if (TAILQ_EMPTY(&asoc->send_queue) &&
13506                                     TAILQ_EMPTY(&asoc->sent_queue) &&
13507                                     (asoc->state & SCTP_STATE_PARTIAL_MSG_LEFT)) {
13508                                         struct mbuf *op_err;
13509                                         char msg[SCTP_DIAG_INFO_LEN];
13510
13511                         abort_anyway:
13512                                         if (free_cnt_applied) {
13513                                                 atomic_add_int(&stcb->asoc.refcnt, -1);
13514                                                 free_cnt_applied = 0;
13515                                         }
13516                                         SCTP_SNPRINTF(msg, sizeof(msg),
13517                                             "%s:%d at %s", __FILE__, __LINE__, __func__);
13518                                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
13519                                             msg);
13520                                         NET_EPOCH_ENTER(et);
13521                                         sctp_abort_an_association(stcb->sctp_ep, stcb,
13522                                             op_err, SCTP_SO_LOCKED);
13523                                         NET_EPOCH_EXIT(et);
13524                                         /*
13525                                          * now relock the stcb so everything
13526                                          * is sane
13527                                          */
13528                                         hold_tcblock = 0;
13529                                         stcb = NULL;
13530                                         goto out;
13531                                 }
13532                                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
13533                                     NULL);
13534                                 sctp_feature_off(inp, SCTP_PCB_FLAGS_NODELAY);
13535                         }
13536                 }
13537         }
13538 skip_out_eof:
13539         if (!TAILQ_EMPTY(&stcb->asoc.control_send_queue)) {
13540                 some_on_control = 1;
13541         }
13542         if (queue_only_for_init) {
13543                 if (hold_tcblock == 0) {
13544                         SCTP_TCB_LOCK(stcb);
13545                         hold_tcblock = 1;
13546                 }
13547                 if (SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) {
13548                         /* a collision took us forward? */
13549                         queue_only = 0;
13550                 } else {
13551                         NET_EPOCH_ENTER(et);
13552                         sctp_send_initiate(inp, stcb, SCTP_SO_LOCKED);
13553                         NET_EPOCH_EXIT(et);
13554                         SCTP_SET_STATE(stcb, SCTP_STATE_COOKIE_WAIT);
13555                         queue_only = 1;
13556                 }
13557         }
13558         if ((net->flight_size > net->cwnd) &&
13559             (stcb->asoc.sctp_cmt_on_off == 0)) {
13560                 SCTP_STAT_INCR(sctps_send_cwnd_avoid);
13561                 queue_only = 1;
13562         } else if (asoc->ifp_had_enobuf) {
13563                 SCTP_STAT_INCR(sctps_ifnomemqueued);
13564                 if (net->flight_size > (2 * net->mtu)) {
13565                         queue_only = 1;
13566                 }
13567                 asoc->ifp_had_enobuf = 0;
13568         }
13569         un_sent = stcb->asoc.total_output_queue_size - stcb->asoc.total_flight;
13570         if ((sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY)) &&
13571             (stcb->asoc.total_flight > 0) &&
13572             (stcb->asoc.stream_queue_cnt < SCTP_MAX_DATA_BUNDLING) &&
13573             (un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD))) {
13574                 /*-
13575                  * Ok, Nagle is set on and we have data outstanding.
13576                  * Don't send anything and let SACKs drive out the
13577                  * data unless wen have a "full" segment to send.
13578                  */
13579                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
13580                         sctp_log_nagle_event(stcb, SCTP_NAGLE_APPLIED);
13581                 }
13582                 SCTP_STAT_INCR(sctps_naglequeued);
13583                 nagle_applies = 1;
13584         } else {
13585                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
13586                         if (sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY))
13587                                 sctp_log_nagle_event(stcb, SCTP_NAGLE_SKIPPED);
13588                 }
13589                 SCTP_STAT_INCR(sctps_naglesent);
13590                 nagle_applies = 0;
13591         }
13592         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13593                 sctp_misc_ints(SCTP_CWNDLOG_PRESEND, queue_only_for_init, queue_only,
13594                     nagle_applies, un_sent);
13595                 sctp_misc_ints(SCTP_CWNDLOG_PRESEND, stcb->asoc.total_output_queue_size,
13596                     stcb->asoc.total_flight,
13597                     stcb->asoc.chunks_on_out_queue, stcb->asoc.total_flight_count);
13598         }
13599         NET_EPOCH_ENTER(et);
13600         if ((queue_only == 0) && (nagle_applies == 0) && (stcb->asoc.peers_rwnd && un_sent)) {
13601                 /* we can attempt to send too. */
13602                 if (hold_tcblock == 0) {
13603                         /*
13604                          * If there is activity recv'ing sacks no need to
13605                          * send
13606                          */
13607                         if (SCTP_TCB_TRYLOCK(stcb)) {
13608                                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13609                                 hold_tcblock = 1;
13610                         }
13611                 } else {
13612                         sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13613                 }
13614         } else if ((queue_only == 0) &&
13615                     (stcb->asoc.peers_rwnd == 0) &&
13616             (stcb->asoc.total_flight == 0)) {
13617                 /* We get to have a probe outstanding */
13618                 if (hold_tcblock == 0) {
13619                         hold_tcblock = 1;
13620                         SCTP_TCB_LOCK(stcb);
13621                 }
13622                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13623         } else if (some_on_control) {
13624                 int num_out, reason, frag_point;
13625
13626                 /* Here we do control only */
13627                 if (hold_tcblock == 0) {
13628                         hold_tcblock = 1;
13629                         SCTP_TCB_LOCK(stcb);
13630                 }
13631                 frag_point = sctp_get_frag_point(stcb, &stcb->asoc);
13632                 (void)sctp_med_chunk_output(inp, stcb, &stcb->asoc, &num_out,
13633                     &reason, 1, 1, &now, &now_filled, frag_point, SCTP_SO_LOCKED);
13634         }
13635         NET_EPOCH_EXIT(et);
13636         SCTPDBG(SCTP_DEBUG_OUTPUT1, "USR Send complete qo:%d prw:%d unsent:%d tf:%d cooq:%d toqs:%d err:%d\n",
13637             queue_only, stcb->asoc.peers_rwnd, un_sent,
13638             stcb->asoc.total_flight, stcb->asoc.chunks_on_out_queue,
13639             stcb->asoc.total_output_queue_size, error);
13640
13641 out:
13642 out_unlocked:
13643
13644         if (local_soresv && stcb) {
13645                 atomic_subtract_int(&stcb->asoc.sb_send_resv, sndlen);
13646         }
13647         if (create_lock_applied) {
13648                 SCTP_ASOC_CREATE_UNLOCK(inp);
13649         }
13650         if ((stcb) && hold_tcblock) {
13651                 SCTP_TCB_UNLOCK(stcb);
13652         }
13653         if (stcb && free_cnt_applied) {
13654                 atomic_add_int(&stcb->asoc.refcnt, -1);
13655         }
13656 #ifdef INVARIANTS
13657         if (stcb) {
13658                 if (mtx_owned(&stcb->tcb_mtx)) {
13659                         panic("Leaving with tcb mtx owned?");
13660                 }
13661                 if (mtx_owned(&stcb->tcb_send_mtx)) {
13662                         panic("Leaving with tcb send mtx owned?");
13663                 }
13664         }
13665 #endif
13666         if (top) {
13667                 sctp_m_freem(top);
13668         }
13669         if (control) {
13670                 sctp_m_freem(control);
13671         }
13672         return (error);
13673 }
13674
13675
13676 /*
13677  * generate an AUTHentication chunk, if required
13678  */
13679 struct mbuf *
13680 sctp_add_auth_chunk(struct mbuf *m, struct mbuf **m_end,
13681     struct sctp_auth_chunk **auth_ret, uint32_t *offset,
13682     struct sctp_tcb *stcb, uint8_t chunk)
13683 {
13684         struct mbuf *m_auth;
13685         struct sctp_auth_chunk *auth;
13686         int chunk_len;
13687         struct mbuf *cn;
13688
13689         if ((m_end == NULL) || (auth_ret == NULL) || (offset == NULL) ||
13690             (stcb == NULL))
13691                 return (m);
13692
13693         if (stcb->asoc.auth_supported == 0) {
13694                 return (m);
13695         }
13696         /* does the requested chunk require auth? */
13697         if (!sctp_auth_is_required_chunk(chunk, stcb->asoc.peer_auth_chunks)) {
13698                 return (m);
13699         }
13700         m_auth = sctp_get_mbuf_for_msg(sizeof(*auth), 0, M_NOWAIT, 1, MT_HEADER);
13701         if (m_auth == NULL) {
13702                 /* no mbuf's */
13703                 return (m);
13704         }
13705         /* reserve some space if this will be the first mbuf */
13706         if (m == NULL)
13707                 SCTP_BUF_RESV_UF(m_auth, SCTP_MIN_OVERHEAD);
13708         /* fill in the AUTH chunk details */
13709         auth = mtod(m_auth, struct sctp_auth_chunk *);
13710         memset(auth, 0, sizeof(*auth));
13711         auth->ch.chunk_type = SCTP_AUTHENTICATION;
13712         auth->ch.chunk_flags = 0;
13713         chunk_len = sizeof(*auth) +
13714             sctp_get_hmac_digest_len(stcb->asoc.peer_hmac_id);
13715         auth->ch.chunk_length = htons(chunk_len);
13716         auth->hmac_id = htons(stcb->asoc.peer_hmac_id);
13717         /* key id and hmac digest will be computed and filled in upon send */
13718
13719         /* save the offset where the auth was inserted into the chain */
13720         *offset = 0;
13721         for (cn = m; cn; cn = SCTP_BUF_NEXT(cn)) {
13722                 *offset += SCTP_BUF_LEN(cn);
13723         }
13724
13725         /* update length and return pointer to the auth chunk */
13726         SCTP_BUF_LEN(m_auth) = chunk_len;
13727         m = sctp_copy_mbufchain(m_auth, m, m_end, 1, chunk_len, 0);
13728         if (auth_ret != NULL)
13729                 *auth_ret = auth;
13730
13731         return (m);
13732 }
13733
13734 #ifdef INET6
13735 int
13736 sctp_v6src_match_nexthop(struct sockaddr_in6 *src6, sctp_route_t *ro)
13737 {
13738         struct nd_prefix *pfx = NULL;
13739         struct nd_pfxrouter *pfxrtr = NULL;
13740         struct sockaddr_in6 gw6;
13741
13742         if (ro == NULL || ro->ro_nh == NULL || src6->sin6_family != AF_INET6)
13743                 return (0);
13744
13745         /* get prefix entry of address */
13746         ND6_RLOCK();
13747         LIST_FOREACH(pfx, &MODULE_GLOBAL(nd_prefix), ndpr_entry) {
13748                 if (pfx->ndpr_stateflags & NDPRF_DETACHED)
13749                         continue;
13750                 if (IN6_ARE_MASKED_ADDR_EQUAL(&pfx->ndpr_prefix.sin6_addr,
13751                     &src6->sin6_addr, &pfx->ndpr_mask))
13752                         break;
13753         }
13754         /* no prefix entry in the prefix list */
13755         if (pfx == NULL) {
13756                 ND6_RUNLOCK();
13757                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "No prefix entry for ");
13758                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)src6);
13759                 return (0);
13760         }
13761
13762         SCTPDBG(SCTP_DEBUG_OUTPUT2, "v6src_match_nexthop(), Prefix entry is ");
13763         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)src6);
13764
13765         /* search installed gateway from prefix entry */
13766         LIST_FOREACH(pfxrtr, &pfx->ndpr_advrtrs, pfr_entry) {
13767                 memset(&gw6, 0, sizeof(struct sockaddr_in6));
13768                 gw6.sin6_family = AF_INET6;
13769                 gw6.sin6_len = sizeof(struct sockaddr_in6);
13770                 memcpy(&gw6.sin6_addr, &pfxrtr->router->rtaddr,
13771                     sizeof(struct in6_addr));
13772                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "prefix router is ");
13773                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)&gw6);
13774                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "installed router is ");
13775                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, &ro->ro_nh->gw_sa);
13776                 if (sctp_cmpaddr((struct sockaddr *)&gw6, &ro->ro_nh->gw_sa)) {
13777                         ND6_RUNLOCK();
13778                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "pfxrouter is installed\n");
13779                         return (1);
13780                 }
13781         }
13782         ND6_RUNLOCK();
13783         SCTPDBG(SCTP_DEBUG_OUTPUT2, "pfxrouter is not installed\n");
13784         return (0);
13785 }
13786 #endif
13787
13788 int
13789 sctp_v4src_match_nexthop(struct sctp_ifa *sifa, sctp_route_t *ro)
13790 {
13791 #ifdef INET
13792         struct sockaddr_in *sin, *mask;
13793         struct ifaddr *ifa;
13794         struct in_addr srcnetaddr, gwnetaddr;
13795
13796         if (ro == NULL || ro->ro_nh == NULL ||
13797             sifa->address.sa.sa_family != AF_INET) {
13798                 return (0);
13799         }
13800         ifa = (struct ifaddr *)sifa->ifa;
13801         mask = (struct sockaddr_in *)(ifa->ifa_netmask);
13802         sin = &sifa->address.sin;
13803         srcnetaddr.s_addr = (sin->sin_addr.s_addr & mask->sin_addr.s_addr);
13804         SCTPDBG(SCTP_DEBUG_OUTPUT1, "match_nexthop4: src address is ");
13805         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, &sifa->address.sa);
13806         SCTPDBG(SCTP_DEBUG_OUTPUT1, "network address is %x\n", srcnetaddr.s_addr);
13807
13808         sin = &ro->ro_nh->gw4_sa;
13809         gwnetaddr.s_addr = (sin->sin_addr.s_addr & mask->sin_addr.s_addr);
13810         SCTPDBG(SCTP_DEBUG_OUTPUT1, "match_nexthop4: nexthop is ");
13811         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, &ro->ro_nh->gw_sa);
13812         SCTPDBG(SCTP_DEBUG_OUTPUT1, "network address is %x\n", gwnetaddr.s_addr);
13813         if (srcnetaddr.s_addr == gwnetaddr.s_addr) {
13814                 return (1);
13815         }
13816 #endif
13817         return (0);
13818 }