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 #if defined(INET) || defined(INET6)
  56 #include <netinet/udp.h>
  57 #endif
  58 #include <netinet/udp_var.h>
  59 #include <machine/in_cksum.h>
  60
  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         inp->next_addr_touse = starting_point;
2549         resettotop = 0;
2550 once_again_too:
2551         if (inp->next_addr_touse == NULL) {
2552                 inp->next_addr_touse = LIST_FIRST(&inp->sctp_addr_list);
2553                 resettotop = 1;
2554         }
2555         /* ok, what about an acceptable address in the inp */
2556         for (laddr = inp->next_addr_touse; laddr;
2557             laddr = LIST_NEXT(laddr, sctp_nxt_addr)) {
2558                 if (laddr->ifa == NULL) {
2559                         /* address has been removed */
2560                         continue;
2561                 }
2562                 if (laddr->action == SCTP_DEL_IP_ADDRESS) {
2563                         /* address is being deleted */
2564                         continue;
2565                 }
2566                 sifa = sctp_is_ifa_addr_acceptable(laddr->ifa, dest_is_loop,
2567                     dest_is_priv, fam);
2568                 if (sifa == NULL)
2569                         continue;
2570                 atomic_add_int(&sifa->refcount, 1);
2571                 return (sifa);
2572         }
2573         if (resettotop == 0) {
2574                 inp->next_addr_touse = NULL;
2575                 goto once_again_too;
2576         }
2577         /*
2578          * no address bound can be a source for the destination we are in
2579          * trouble
2580          */
2581         return (NULL);
2582 }
2583
2584
2585
2586 static struct sctp_ifa *
2587 sctp_choose_boundspecific_stcb(struct sctp_inpcb *inp,
2588     struct sctp_tcb *stcb,
2589     sctp_route_t *ro,
2590     uint32_t vrf_id,
2591     uint8_t dest_is_priv,
2592     uint8_t dest_is_loop,
2593     int non_asoc_addr_ok,
2594     sa_family_t fam)
2595 {
2596         struct sctp_laddr *laddr, *starting_point;
2597         void *ifn;
2598         struct sctp_ifn *sctp_ifn;
2599         struct sctp_ifa *sctp_ifa, *sifa;
2600         uint8_t start_at_beginning = 0;
2601         struct sctp_vrf *vrf;
2602         uint32_t ifn_index;
2603
2604         /*
2605          * first question, is the ifn we will emit on in our list, if so, we
2606          * want that one.
2607          */
2608         vrf = sctp_find_vrf(vrf_id);
2609         if (vrf == NULL)
2610                 return (NULL);
2611
2612         ifn = SCTP_GET_IFN_VOID_FROM_ROUTE(ro);
2613         ifn_index = SCTP_GET_IF_INDEX_FROM_ROUTE(ro);
2614         sctp_ifn = sctp_find_ifn(ifn, ifn_index);
2615
2616         /*
2617          * first question, is the ifn we will emit on in our list?  If so,
2618          * we want that one. First we look for a preferred. Second, we go
2619          * for an acceptable.
2620          */
2621         if (sctp_ifn) {
2622                 /* first try for a preferred address on the ep */
2623                 LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
2624 #ifdef INET
2625                         if ((sctp_ifa->address.sa.sa_family == AF_INET) &&
2626                             (prison_check_ip4(inp->ip_inp.inp.inp_cred,
2627                             &sctp_ifa->address.sin.sin_addr) != 0)) {
2628                                 continue;
2629                         }
2630 #endif
2631 #ifdef INET6
2632                         if ((sctp_ifa->address.sa.sa_family == AF_INET6) &&
2633                             (prison_check_ip6(inp->ip_inp.inp.inp_cred,
2634                             &sctp_ifa->address.sin6.sin6_addr) != 0)) {
2635                                 continue;
2636                         }
2637 #endif
2638                         if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) && (non_asoc_addr_ok == 0))
2639                                 continue;
2640                         if (sctp_is_addr_in_ep(inp, sctp_ifa)) {
2641                                 sifa = sctp_is_ifa_addr_preferred(sctp_ifa, dest_is_loop, dest_is_priv, fam);
2642                                 if (sifa == NULL)
2643                                         continue;
2644                                 if (((non_asoc_addr_ok == 0) &&
2645                                     (sctp_is_addr_restricted(stcb, sifa))) ||
2646                                     (non_asoc_addr_ok &&
2647                                     (sctp_is_addr_restricted(stcb, sifa)) &&
2648                                     (!sctp_is_addr_pending(stcb, sifa)))) {
2649                                         /* on the no-no list */
2650                                         continue;
2651                                 }
2652                                 atomic_add_int(&sifa->refcount, 1);
2653                                 return (sifa);
2654                         }
2655                 }
2656                 /* next try for an acceptable address on the ep */
2657                 LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
2658 #ifdef INET
2659                         if ((sctp_ifa->address.sa.sa_family == AF_INET) &&
2660                             (prison_check_ip4(inp->ip_inp.inp.inp_cred,
2661                             &sctp_ifa->address.sin.sin_addr) != 0)) {
2662                                 continue;
2663                         }
2664 #endif
2665 #ifdef INET6
2666                         if ((sctp_ifa->address.sa.sa_family == AF_INET6) &&
2667                             (prison_check_ip6(inp->ip_inp.inp.inp_cred,
2668                             &sctp_ifa->address.sin6.sin6_addr) != 0)) {
2669                                 continue;
2670                         }
2671 #endif
2672                         if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) && (non_asoc_addr_ok == 0))
2673                                 continue;
2674                         if (sctp_is_addr_in_ep(inp, sctp_ifa)) {
2675                                 sifa = sctp_is_ifa_addr_acceptable(sctp_ifa, dest_is_loop, dest_is_priv, fam);
2676                                 if (sifa == NULL)
2677                                         continue;
2678                                 if (((non_asoc_addr_ok == 0) &&
2679                                     (sctp_is_addr_restricted(stcb, sifa))) ||
2680                                     (non_asoc_addr_ok &&
2681                                     (sctp_is_addr_restricted(stcb, sifa)) &&
2682                                     (!sctp_is_addr_pending(stcb, sifa)))) {
2683                                         /* on the no-no list */
2684                                         continue;
2685                                 }
2686                                 atomic_add_int(&sifa->refcount, 1);
2687                                 return (sifa);
2688                         }
2689                 }
2690
2691         }
2692         /*
2693          * if we can't find one like that then we must look at all addresses
2694          * bound to pick one at first preferable then secondly acceptable.
2695          */
2696         starting_point = stcb->asoc.last_used_address;
2697 sctp_from_the_top:
2698         if (stcb->asoc.last_used_address == NULL) {
2699                 start_at_beginning = 1;
2700                 stcb->asoc.last_used_address = LIST_FIRST(&inp->sctp_addr_list);
2701         }
2702         /* search beginning with the last used address */
2703         for (laddr = stcb->asoc.last_used_address; laddr;
2704             laddr = LIST_NEXT(laddr, sctp_nxt_addr)) {
2705                 if (laddr->ifa == NULL) {
2706                         /* address has been removed */
2707                         continue;
2708                 }
2709                 if (laddr->action == SCTP_DEL_IP_ADDRESS) {
2710                         /* address is being deleted */
2711                         continue;
2712                 }
2713                 sifa = sctp_is_ifa_addr_preferred(laddr->ifa, dest_is_loop, dest_is_priv, fam);
2714                 if (sifa == NULL)
2715                         continue;
2716                 if (((non_asoc_addr_ok == 0) &&
2717                     (sctp_is_addr_restricted(stcb, sifa))) ||
2718                     (non_asoc_addr_ok &&
2719                     (sctp_is_addr_restricted(stcb, sifa)) &&
2720                     (!sctp_is_addr_pending(stcb, sifa)))) {
2721                         /* on the no-no list */
2722                         continue;
2723                 }
2724                 stcb->asoc.last_used_address = laddr;
2725                 atomic_add_int(&sifa->refcount, 1);
2726                 return (sifa);
2727         }
2728         if (start_at_beginning == 0) {
2729                 stcb->asoc.last_used_address = NULL;
2730                 goto sctp_from_the_top;
2731         }
2732         /* now try for any higher scope than the destination */
2733         stcb->asoc.last_used_address = starting_point;
2734         start_at_beginning = 0;
2735 sctp_from_the_top2:
2736         if (stcb->asoc.last_used_address == NULL) {
2737                 start_at_beginning = 1;
2738                 stcb->asoc.last_used_address = LIST_FIRST(&inp->sctp_addr_list);
2739         }
2740         /* search beginning with the last used address */
2741         for (laddr = stcb->asoc.last_used_address; laddr;
2742             laddr = LIST_NEXT(laddr, sctp_nxt_addr)) {
2743                 if (laddr->ifa == NULL) {
2744                         /* address has been removed */
2745                         continue;
2746                 }
2747                 if (laddr->action == SCTP_DEL_IP_ADDRESS) {
2748                         /* address is being deleted */
2749                         continue;
2750                 }
2751                 sifa = sctp_is_ifa_addr_acceptable(laddr->ifa, dest_is_loop,
2752                     dest_is_priv, fam);
2753                 if (sifa == NULL)
2754                         continue;
2755                 if (((non_asoc_addr_ok == 0) &&
2756                     (sctp_is_addr_restricted(stcb, sifa))) ||
2757                     (non_asoc_addr_ok &&
2758                     (sctp_is_addr_restricted(stcb, sifa)) &&
2759                     (!sctp_is_addr_pending(stcb, sifa)))) {
2760                         /* on the no-no list */
2761                         continue;
2762                 }
2763                 stcb->asoc.last_used_address = laddr;
2764                 atomic_add_int(&sifa->refcount, 1);
2765                 return (sifa);
2766         }
2767         if (start_at_beginning == 0) {
2768                 stcb->asoc.last_used_address = NULL;
2769                 goto sctp_from_the_top2;
2770         }
2771         return (NULL);
2772 }
2773
2774 static struct sctp_ifa *
2775 sctp_select_nth_preferred_addr_from_ifn_boundall(struct sctp_ifn *ifn,
2776     struct sctp_inpcb *inp,
2777     struct sctp_tcb *stcb,
2778     int non_asoc_addr_ok,
2779     uint8_t dest_is_loop,
2780     uint8_t dest_is_priv,
2781     int addr_wanted,
2782     sa_family_t fam,
2783     sctp_route_t *ro
2784 )
2785 {
2786         struct sctp_ifa *ifa, *sifa;
2787         int num_eligible_addr = 0;
2788 #ifdef INET6
2789         struct sockaddr_in6 sin6, lsa6;
2790
2791         if (fam == AF_INET6) {
2792                 memcpy(&sin6, &ro->ro_dst, sizeof(struct sockaddr_in6));
2793                 (void)sa6_recoverscope(&sin6);
2794         }
2795 #endif                          /* INET6 */
2796         LIST_FOREACH(ifa, &ifn->ifalist, next_ifa) {
2797 #ifdef INET
2798                 if ((ifa->address.sa.sa_family == AF_INET) &&
2799                     (prison_check_ip4(inp->ip_inp.inp.inp_cred,
2800                     &ifa->address.sin.sin_addr) != 0)) {
2801                         continue;
2802                 }
2803 #endif
2804 #ifdef INET6
2805                 if ((ifa->address.sa.sa_family == AF_INET6) &&
2806                     (prison_check_ip6(inp->ip_inp.inp.inp_cred,
2807                     &ifa->address.sin6.sin6_addr) != 0)) {
2808                         continue;
2809                 }
2810 #endif
2811                 if ((ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
2812                     (non_asoc_addr_ok == 0))
2813                         continue;
2814                 sifa = sctp_is_ifa_addr_preferred(ifa, dest_is_loop,
2815                     dest_is_priv, fam);
2816                 if (sifa == NULL)
2817                         continue;
2818 #ifdef INET6
2819                 if (fam == AF_INET6 &&
2820                     dest_is_loop &&
2821                     sifa->src_is_loop && sifa->src_is_priv) {
2822                         /*
2823                          * don't allow fe80::1 to be a src on loop ::1, we
2824                          * don't list it to the peer so we will get an
2825                          * abort.
2826                          */
2827                         continue;
2828                 }
2829                 if (fam == AF_INET6 &&
2830                     IN6_IS_ADDR_LINKLOCAL(&sifa->address.sin6.sin6_addr) &&
2831                     IN6_IS_ADDR_LINKLOCAL(&sin6.sin6_addr)) {
2832                         /*
2833                          * link-local <-> link-local must belong to the same
2834                          * scope.
2835                          */
2836                         memcpy(&lsa6, &sifa->address.sin6, sizeof(struct sockaddr_in6));
2837                         (void)sa6_recoverscope(&lsa6);
2838                         if (sin6.sin6_scope_id != lsa6.sin6_scope_id) {
2839                                 continue;
2840                         }
2841                 }
2842 #endif                          /* INET6 */
2843
2844                 /*
2845                  * Check if the IPv6 address matches to next-hop. In the
2846                  * mobile case, old IPv6 address may be not deleted from the
2847                  * interface. Then, the interface has previous and new
2848                  * addresses.  We should use one corresponding to the
2849                  * next-hop.  (by micchie)
2850                  */
2851 #ifdef INET6
2852                 if (stcb && fam == AF_INET6 &&
2853                     sctp_is_mobility_feature_on(stcb->sctp_ep, SCTP_MOBILITY_BASE)) {
2854                         if (sctp_v6src_match_nexthop(&sifa->address.sin6, ro)
2855                             == 0) {
2856                                 continue;
2857                         }
2858                 }
2859 #endif
2860 #ifdef INET
2861                 /* Avoid topologically incorrect IPv4 address */
2862                 if (stcb && fam == AF_INET &&
2863                     sctp_is_mobility_feature_on(stcb->sctp_ep, SCTP_MOBILITY_BASE)) {
2864                         if (sctp_v4src_match_nexthop(sifa, ro) == 0) {
2865                                 continue;
2866                         }
2867                 }
2868 #endif
2869                 if (stcb) {
2870                         if (sctp_is_address_in_scope(ifa, &stcb->asoc.scope, 0) == 0) {
2871                                 continue;
2872                         }
2873                         if (((non_asoc_addr_ok == 0) &&
2874                             (sctp_is_addr_restricted(stcb, sifa))) ||
2875                             (non_asoc_addr_ok &&
2876                             (sctp_is_addr_restricted(stcb, sifa)) &&
2877                             (!sctp_is_addr_pending(stcb, sifa)))) {
2878                                 /*
2879                                  * It is restricted for some reason..
2880                                  * probably not yet added.
2881                                  */
2882                                 continue;
2883                         }
2884                 }
2885                 if (num_eligible_addr >= addr_wanted) {
2886                         return (sifa);
2887                 }
2888                 num_eligible_addr++;
2889         }
2890         return (NULL);
2891 }
2892
2893
2894 static int
2895 sctp_count_num_preferred_boundall(struct sctp_ifn *ifn,
2896     struct sctp_inpcb *inp,
2897     struct sctp_tcb *stcb,
2898     int non_asoc_addr_ok,
2899     uint8_t dest_is_loop,
2900     uint8_t dest_is_priv,
2901     sa_family_t fam)
2902 {
2903         struct sctp_ifa *ifa, *sifa;
2904         int num_eligible_addr = 0;
2905
2906         LIST_FOREACH(ifa, &ifn->ifalist, next_ifa) {
2907 #ifdef INET
2908                 if ((ifa->address.sa.sa_family == AF_INET) &&
2909                     (prison_check_ip4(inp->ip_inp.inp.inp_cred,
2910                     &ifa->address.sin.sin_addr) != 0)) {
2911                         continue;
2912                 }
2913 #endif
2914 #ifdef INET6
2915                 if ((ifa->address.sa.sa_family == AF_INET6) &&
2916                     (stcb != NULL) &&
2917                     (prison_check_ip6(inp->ip_inp.inp.inp_cred,
2918                     &ifa->address.sin6.sin6_addr) != 0)) {
2919                         continue;
2920                 }
2921 #endif
2922                 if ((ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
2923                     (non_asoc_addr_ok == 0)) {
2924                         continue;
2925                 }
2926                 sifa = sctp_is_ifa_addr_preferred(ifa, dest_is_loop,
2927                     dest_is_priv, fam);
2928                 if (sifa == NULL) {
2929                         continue;
2930                 }
2931                 if (stcb) {
2932                         if (sctp_is_address_in_scope(ifa, &stcb->asoc.scope, 0) == 0) {
2933                                 continue;
2934                         }
2935                         if (((non_asoc_addr_ok == 0) &&
2936                             (sctp_is_addr_restricted(stcb, sifa))) ||
2937                             (non_asoc_addr_ok &&
2938                             (sctp_is_addr_restricted(stcb, sifa)) &&
2939                             (!sctp_is_addr_pending(stcb, sifa)))) {
2940                                 /*
2941                                  * It is restricted for some reason..
2942                                  * probably not yet added.
2943                                  */
2944                                 continue;
2945                         }
2946                 }
2947                 num_eligible_addr++;
2948         }
2949         return (num_eligible_addr);
2950 }
2951
2952 static struct sctp_ifa *
2953 sctp_choose_boundall(struct sctp_inpcb *inp,
2954     struct sctp_tcb *stcb,
2955     struct sctp_nets *net,
2956     sctp_route_t *ro,
2957     uint32_t vrf_id,
2958     uint8_t dest_is_priv,
2959     uint8_t dest_is_loop,
2960     int non_asoc_addr_ok,
2961     sa_family_t fam)
2962 {
2963         int cur_addr_num = 0, num_preferred = 0;
2964         void *ifn;
2965         struct sctp_ifn *sctp_ifn, *looked_at = NULL, *emit_ifn;
2966         struct sctp_ifa *sctp_ifa, *sifa;
2967         uint32_t ifn_index;
2968         struct sctp_vrf *vrf;
2969 #ifdef INET
2970         int retried = 0;
2971 #endif
2972
2973         /*-
2974          * For boundall we can use any address in the association.
2975          * If non_asoc_addr_ok is set we can use any address (at least in
2976          * theory). So we look for preferred addresses first. If we find one,
2977          * we use it. Otherwise we next try to get an address on the
2978          * interface, which we should be able to do (unless non_asoc_addr_ok
2979          * is false and we are routed out that way). In these cases where we
2980          * can't use the address of the interface we go through all the
2981          * ifn's looking for an address we can use and fill that in. Punting
2982          * means we send back address 0, which will probably cause problems
2983          * actually since then IP will fill in the address of the route ifn,
2984          * which means we probably already rejected it.. i.e. here comes an
2985          * abort :-<.
2986          */
2987         vrf = sctp_find_vrf(vrf_id);
2988         if (vrf == NULL)
2989                 return (NULL);
2990
2991         ifn = SCTP_GET_IFN_VOID_FROM_ROUTE(ro);
2992         ifn_index = SCTP_GET_IF_INDEX_FROM_ROUTE(ro);
2993         SCTPDBG(SCTP_DEBUG_OUTPUT2, "ifn from route:%p ifn_index:%d\n", ifn, ifn_index);
2994         emit_ifn = looked_at = sctp_ifn = sctp_find_ifn(ifn, ifn_index);
2995         if (sctp_ifn == NULL) {
2996                 /* ?? We don't have this guy ?? */
2997                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "No ifn emit interface?\n");
2998                 goto bound_all_plan_b;
2999         }
3000         SCTPDBG(SCTP_DEBUG_OUTPUT2, "ifn_index:%d name:%s is emit interface\n",
3001             ifn_index, sctp_ifn->ifn_name);
3002
3003         if (net) {
3004                 cur_addr_num = net->indx_of_eligible_next_to_use;
3005         }
3006         num_preferred = sctp_count_num_preferred_boundall(sctp_ifn,
3007             inp, stcb,
3008             non_asoc_addr_ok,
3009             dest_is_loop,
3010             dest_is_priv, fam);
3011         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Found %d preferred source addresses for intf:%s\n",
3012             num_preferred, sctp_ifn->ifn_name);
3013         if (num_preferred == 0) {
3014                 /*
3015                  * no eligible addresses, we must use some other interface
3016                  * address if we can find one.
3017                  */
3018                 goto bound_all_plan_b;
3019         }
3020         /*
3021          * Ok we have num_eligible_addr set with how many we can use, this
3022          * may vary from call to call due to addresses being deprecated
3023          * etc..
3024          */
3025         if (cur_addr_num >= num_preferred) {
3026                 cur_addr_num = 0;
3027         }
3028         /*
3029          * select the nth address from the list (where cur_addr_num is the
3030          * nth) and 0 is the first one, 1 is the second one etc...
3031          */
3032         SCTPDBG(SCTP_DEBUG_OUTPUT2, "cur_addr_num:%d\n", cur_addr_num);
3033
3034         sctp_ifa = sctp_select_nth_preferred_addr_from_ifn_boundall(sctp_ifn, inp, stcb, non_asoc_addr_ok, dest_is_loop,
3035             dest_is_priv, cur_addr_num, fam, ro);
3036
3037         /* if sctp_ifa is NULL something changed??, fall to plan b. */
3038         if (sctp_ifa) {
3039                 atomic_add_int(&sctp_ifa->refcount, 1);
3040                 if (net) {
3041                         /* save off where the next one we will want */
3042                         net->indx_of_eligible_next_to_use = cur_addr_num + 1;
3043                 }
3044                 return (sctp_ifa);
3045         }
3046         /*
3047          * plan_b: Look at all interfaces and find a preferred address. If
3048          * no preferred fall through to plan_c.
3049          */
3050 bound_all_plan_b:
3051         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Trying Plan B\n");
3052         LIST_FOREACH(sctp_ifn, &vrf->ifnlist, next_ifn) {
3053                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "Examine interface %s\n",
3054                     sctp_ifn->ifn_name);
3055                 if (dest_is_loop == 0 && SCTP_IFN_IS_IFT_LOOP(sctp_ifn)) {
3056                         /* wrong base scope */
3057                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "skip\n");
3058                         continue;
3059                 }
3060                 if ((sctp_ifn == looked_at) && looked_at) {
3061                         /* already looked at this guy */
3062                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "already seen\n");
3063                         continue;
3064                 }
3065                 num_preferred = sctp_count_num_preferred_boundall(sctp_ifn, inp, stcb, non_asoc_addr_ok,
3066                     dest_is_loop, dest_is_priv, fam);
3067                 SCTPDBG(SCTP_DEBUG_OUTPUT2,
3068                     "Found ifn:%p %d preferred source addresses\n",
3069                     ifn, num_preferred);
3070                 if (num_preferred == 0) {
3071                         /* None on this interface. */
3072                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "No preferred -- skipping to next\n");
3073                         continue;
3074                 }
3075                 SCTPDBG(SCTP_DEBUG_OUTPUT2,
3076                     "num preferred:%d on interface:%p cur_addr_num:%d\n",
3077                     num_preferred, (void *)sctp_ifn, cur_addr_num);
3078
3079                 /*
3080                  * Ok we have num_eligible_addr set with how many we can
3081                  * use, this may vary from call to call due to addresses
3082                  * being deprecated etc..
3083                  */
3084                 if (cur_addr_num >= num_preferred) {
3085                         cur_addr_num = 0;
3086                 }
3087                 sifa = sctp_select_nth_preferred_addr_from_ifn_boundall(sctp_ifn, inp, stcb, non_asoc_addr_ok, dest_is_loop,
3088                     dest_is_priv, cur_addr_num, fam, ro);
3089                 if (sifa == NULL)
3090                         continue;
3091                 if (net) {
3092                         net->indx_of_eligible_next_to_use = cur_addr_num + 1;
3093                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "we selected %d\n",
3094                             cur_addr_num);
3095                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Source:");
3096                         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, &sifa->address.sa);
3097                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Dest:");
3098                         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, &net->ro._l_addr.sa);
3099                 }
3100                 atomic_add_int(&sifa->refcount, 1);
3101                 return (sifa);
3102         }
3103 #ifdef INET
3104 again_with_private_addresses_allowed:
3105 #endif
3106         /* plan_c: do we have an acceptable address on the emit interface */
3107         sifa = NULL;
3108         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Trying Plan C: find acceptable on interface\n");
3109         if (emit_ifn == NULL) {
3110                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "Jump to Plan D - no emit_ifn\n");
3111                 goto plan_d;
3112         }
3113         LIST_FOREACH(sctp_ifa, &emit_ifn->ifalist, next_ifa) {
3114                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "ifa:%p\n", (void *)sctp_ifa);
3115 #ifdef INET
3116                 if ((sctp_ifa->address.sa.sa_family == AF_INET) &&
3117                     (prison_check_ip4(inp->ip_inp.inp.inp_cred,
3118                     &sctp_ifa->address.sin.sin_addr) != 0)) {
3119                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Jailed\n");
3120                         continue;
3121                 }
3122 #endif
3123 #ifdef INET6
3124                 if ((sctp_ifa->address.sa.sa_family == AF_INET6) &&
3125                     (prison_check_ip6(inp->ip_inp.inp.inp_cred,
3126                     &sctp_ifa->address.sin6.sin6_addr) != 0)) {
3127                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Jailed\n");
3128                         continue;
3129                 }
3130 #endif
3131                 if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
3132                     (non_asoc_addr_ok == 0)) {
3133                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Defer\n");
3134                         continue;
3135                 }
3136                 sifa = sctp_is_ifa_addr_acceptable(sctp_ifa, dest_is_loop,
3137                     dest_is_priv, fam);
3138                 if (sifa == NULL) {
3139                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "IFA not acceptable\n");
3140                         continue;
3141                 }
3142                 if (stcb) {
3143                         if (sctp_is_address_in_scope(sifa, &stcb->asoc.scope, 0) == 0) {
3144                                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "NOT in scope\n");
3145                                 sifa = NULL;
3146                                 continue;
3147                         }
3148                         if (((non_asoc_addr_ok == 0) &&
3149                             (sctp_is_addr_restricted(stcb, sifa))) ||
3150                             (non_asoc_addr_ok &&
3151                             (sctp_is_addr_restricted(stcb, sifa)) &&
3152                             (!sctp_is_addr_pending(stcb, sifa)))) {
3153                                 /*
3154                                  * It is restricted for some reason..
3155                                  * probably not yet added.
3156                                  */
3157                                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "Its restricted\n");
3158                                 sifa = NULL;
3159                                 continue;
3160                         }
3161                 }
3162                 atomic_add_int(&sifa->refcount, 1);
3163                 goto out;
3164         }
3165 plan_d:
3166         /*
3167          * plan_d: We are in trouble. No preferred address on the emit
3168          * interface. And not even a preferred address on all interfaces. Go
3169          * out and see if we can find an acceptable address somewhere
3170          * amongst all interfaces.
3171          */
3172         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Trying Plan D looked_at is %p\n", (void *)looked_at);
3173         LIST_FOREACH(sctp_ifn, &vrf->ifnlist, next_ifn) {
3174                 if (dest_is_loop == 0 && SCTP_IFN_IS_IFT_LOOP(sctp_ifn)) {
3175                         /* wrong base scope */
3176                         continue;
3177                 }
3178                 LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
3179 #ifdef INET
3180                         if ((sctp_ifa->address.sa.sa_family == AF_INET) &&
3181                             (prison_check_ip4(inp->ip_inp.inp.inp_cred,
3182                             &sctp_ifa->address.sin.sin_addr) != 0)) {
3183                                 continue;
3184                         }
3185 #endif
3186 #ifdef INET6
3187                         if ((sctp_ifa->address.sa.sa_family == AF_INET6) &&
3188                             (prison_check_ip6(inp->ip_inp.inp.inp_cred,
3189                             &sctp_ifa->address.sin6.sin6_addr) != 0)) {
3190                                 continue;
3191                         }
3192 #endif
3193                         if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
3194                             (non_asoc_addr_ok == 0))
3195                                 continue;
3196                         sifa = sctp_is_ifa_addr_acceptable(sctp_ifa,
3197                             dest_is_loop,
3198                             dest_is_priv, fam);
3199                         if (sifa == NULL)
3200                                 continue;
3201                         if (stcb) {
3202                                 if (sctp_is_address_in_scope(sifa, &stcb->asoc.scope, 0) == 0) {
3203                                         sifa = NULL;
3204                                         continue;
3205                                 }
3206                                 if (((non_asoc_addr_ok == 0) &&
3207                                     (sctp_is_addr_restricted(stcb, sifa))) ||
3208                                     (non_asoc_addr_ok &&
3209                                     (sctp_is_addr_restricted(stcb, sifa)) &&
3210                                     (!sctp_is_addr_pending(stcb, sifa)))) {
3211                                         /*
3212                                          * It is restricted for some
3213                                          * reason.. probably not yet added.
3214                                          */
3215                                         sifa = NULL;
3216                                         continue;
3217                                 }
3218                         }
3219                         goto out;
3220                 }
3221         }
3222 #ifdef INET
3223         if (stcb) {
3224                 if ((retried == 0) && (stcb->asoc.scope.ipv4_local_scope == 0)) {
3225                         stcb->asoc.scope.ipv4_local_scope = 1;
3226                         retried = 1;
3227                         goto again_with_private_addresses_allowed;
3228                 } else if (retried == 1) {
3229                         stcb->asoc.scope.ipv4_local_scope = 0;
3230                 }
3231         }
3232 #endif
3233 out:
3234 #ifdef INET
3235         if (sifa) {
3236                 if (retried == 1) {
3237                         LIST_FOREACH(sctp_ifn, &vrf->ifnlist, next_ifn) {
3238                                 if (dest_is_loop == 0 && SCTP_IFN_IS_IFT_LOOP(sctp_ifn)) {
3239                                         /* wrong base scope */
3240                                         continue;
3241                                 }
3242                                 LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
3243                                         struct sctp_ifa *tmp_sifa;
3244
3245 #ifdef INET
3246                                         if ((sctp_ifa->address.sa.sa_family == AF_INET) &&
3247                                             (prison_check_ip4(inp->ip_inp.inp.inp_cred,
3248                                             &sctp_ifa->address.sin.sin_addr) != 0)) {
3249                                                 continue;
3250                                         }
3251 #endif
3252 #ifdef INET6
3253                                         if ((sctp_ifa->address.sa.sa_family == AF_INET6) &&
3254                                             (prison_check_ip6(inp->ip_inp.inp.inp_cred,
3255                                             &sctp_ifa->address.sin6.sin6_addr) != 0)) {
3256                                                 continue;
3257                                         }
3258 #endif
3259                                         if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
3260                                             (non_asoc_addr_ok == 0))
3261                                                 continue;
3262                                         tmp_sifa = sctp_is_ifa_addr_acceptable(sctp_ifa,
3263                                             dest_is_loop,
3264                                             dest_is_priv, fam);
3265                                         if (tmp_sifa == NULL) {
3266                                                 continue;
3267                                         }
3268                                         if (tmp_sifa == sifa) {
3269                                                 continue;
3270                                         }
3271                                         if (stcb) {
3272                                                 if (sctp_is_address_in_scope(tmp_sifa,
3273                                                     &stcb->asoc.scope, 0) == 0) {
3274                                                         continue;
3275                                                 }
3276                                                 if (((non_asoc_addr_ok == 0) &&
3277                                                     (sctp_is_addr_restricted(stcb, tmp_sifa))) ||
3278                                                     (non_asoc_addr_ok &&
3279                                                     (sctp_is_addr_restricted(stcb, tmp_sifa)) &&
3280                                                     (!sctp_is_addr_pending(stcb, tmp_sifa)))) {
3281                                                         /*
3282                                                          * It is restricted
3283                                                          * for some reason..
3284                                                          * probably not yet
3285                                                          * added.
3286                                                          */
3287                                                         continue;
3288                                                 }
3289                                         }
3290                                         if ((tmp_sifa->address.sin.sin_family == AF_INET) &&
3291                                             (IN4_ISPRIVATE_ADDRESS(&(tmp_sifa->address.sin.sin_addr)))) {
3292                                                 sctp_add_local_addr_restricted(stcb, tmp_sifa);
3293                                         }
3294                                 }
3295                         }
3296                 }
3297                 atomic_add_int(&sifa->refcount, 1);
3298         }
3299 #endif
3300         return (sifa);
3301 }
3302
3303
3304
3305 /* tcb may be NULL */
3306 struct sctp_ifa *
3307 sctp_source_address_selection(struct sctp_inpcb *inp,
3308     struct sctp_tcb *stcb,
3309     sctp_route_t *ro,
3310     struct sctp_nets *net,
3311     int non_asoc_addr_ok, uint32_t vrf_id)
3312 {
3313         struct sctp_ifa *answer;
3314         uint8_t dest_is_priv, dest_is_loop;
3315         sa_family_t fam;
3316 #ifdef INET
3317         struct sockaddr_in *to = (struct sockaddr_in *)&ro->ro_dst;
3318 #endif
3319 #ifdef INET6
3320         struct sockaddr_in6 *to6 = (struct sockaddr_in6 *)&ro->ro_dst;
3321 #endif
3322
3323         /**
3324          * Rules:
3325          * - Find the route if needed, cache if I can.
3326          * - Look at interface address in route, Is it in the bound list. If so we
3327          *   have the best source.
3328          * - If not we must rotate amongst the addresses.
3329          *
3330          * Cavets and issues
3331          *
3332          * Do we need to pay attention to scope. We can have a private address
3333          * or a global address we are sourcing or sending to. So if we draw
3334          * it out
3335          * zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz
3336          * For V4
3337          * ------------------------------------------
3338          *      source     *      dest  *  result
3339          * -----------------------------------------
3340          * <a>  Private    *    Global  *  NAT
3341          * -----------------------------------------
3342          * <b>  Private    *    Private *  No problem
3343          * -----------------------------------------
3344          * <c>  Global     *    Private *  Huh, How will this work?
3345          * -----------------------------------------
3346          * <d>  Global     *    Global  *  No Problem
3347          *------------------------------------------
3348          * zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz
3349          * For V6
3350          *------------------------------------------
3351          *      source     *      dest  *  result
3352          * -----------------------------------------
3353          * <a>  Linklocal  *    Global  *
3354          * -----------------------------------------
3355          * <b>  Linklocal  * Linklocal  *  No problem
3356          * -----------------------------------------
3357          * <c>  Global     * Linklocal  *  Huh, How will this work?
3358          * -----------------------------------------
3359          * <d>  Global     *    Global  *  No Problem
3360          *------------------------------------------
3361          * zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz
3362          *
3363          * And then we add to that what happens if there are multiple addresses
3364          * assigned to an interface. Remember the ifa on a ifn is a linked
3365          * list of addresses. So one interface can have more than one IP
3366          * address. What happens if we have both a private and a global
3367          * address? Do we then use context of destination to sort out which
3368          * one is best? And what about NAT's sending P->G may get you a NAT
3369          * translation, or should you select the G thats on the interface in
3370          * preference.
3371          *
3372          * Decisions:
3373          *
3374          * - count the number of addresses on the interface.
3375          * - if it is one, no problem except case <c>.
3376          *   For <a> we will assume a NAT out there.
3377          * - if there are more than one, then we need to worry about scope P
3378          *   or G. We should prefer G -> G and P -> P if possible.
3379          *   Then as a secondary fall back to mixed types G->P being a last
3380          *   ditch one.
3381          * - The above all works for bound all, but bound specific we need to
3382          *   use the same concept but instead only consider the bound
3383          *   addresses. If the bound set is NOT assigned to the interface then
3384          *   we must use rotation amongst the bound addresses..
3385          */
3386         if (ro->ro_rt == NULL) {
3387                 /*
3388                  * Need a route to cache.
3389                  */
3390                 SCTP_RTALLOC(ro, vrf_id, inp->fibnum);
3391         }
3392         if (ro->ro_rt == NULL) {
3393                 return (NULL);
3394         }
3395         fam = ro->ro_dst.sa_family;
3396         dest_is_priv = dest_is_loop = 0;
3397         /* Setup our scopes for the destination */
3398         switch (fam) {
3399 #ifdef INET
3400         case AF_INET:
3401                 /* Scope based on outbound address */
3402                 if (IN4_ISLOOPBACK_ADDRESS(&to->sin_addr)) {
3403                         dest_is_loop = 1;
3404                         if (net != NULL) {
3405                                 /* mark it as local */
3406                                 net->addr_is_local = 1;
3407                         }
3408                 } else if ((IN4_ISPRIVATE_ADDRESS(&to->sin_addr))) {
3409                         dest_is_priv = 1;
3410                 }
3411                 break;
3412 #endif
3413 #ifdef INET6
3414         case AF_INET6:
3415                 /* Scope based on outbound address */
3416                 if (IN6_IS_ADDR_LOOPBACK(&to6->sin6_addr) ||
3417                     SCTP_ROUTE_IS_REAL_LOOP(ro)) {
3418                         /*
3419                          * If the address is a loopback address, which
3420                          * consists of "::1" OR "fe80::1%lo0", we are
3421                          * loopback scope. But we don't use dest_is_priv
3422                          * (link local addresses).
3423                          */
3424                         dest_is_loop = 1;
3425                         if (net != NULL) {
3426                                 /* mark it as local */
3427                                 net->addr_is_local = 1;
3428                         }
3429                 } else if (IN6_IS_ADDR_LINKLOCAL(&to6->sin6_addr)) {
3430                         dest_is_priv = 1;
3431                 }
3432                 break;
3433 #endif
3434         }
3435         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Select source addr for:");
3436         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)&ro->ro_dst);
3437         SCTP_IPI_ADDR_RLOCK();
3438         if (inp->sctp_flags & SCTP_PCB_FLAGS_BOUNDALL) {
3439                 /*
3440                  * Bound all case
3441                  */
3442                 answer = sctp_choose_boundall(inp, stcb, net, ro, vrf_id,
3443                     dest_is_priv, dest_is_loop,
3444                     non_asoc_addr_ok, fam);
3445                 SCTP_IPI_ADDR_RUNLOCK();
3446                 return (answer);
3447         }
3448         /*
3449          * Subset bound case
3450          */
3451         if (stcb) {
3452                 answer = sctp_choose_boundspecific_stcb(inp, stcb, ro,
3453                     vrf_id, dest_is_priv,
3454                     dest_is_loop,
3455                     non_asoc_addr_ok, fam);
3456         } else {
3457                 answer = sctp_choose_boundspecific_inp(inp, ro, vrf_id,
3458                     non_asoc_addr_ok,
3459                     dest_is_priv,
3460                     dest_is_loop, fam);
3461         }
3462         SCTP_IPI_ADDR_RUNLOCK();
3463         return (answer);
3464 }
3465
3466 static int
3467 sctp_find_cmsg(int c_type, void *data, struct mbuf *control, size_t cpsize)
3468 {
3469         struct cmsghdr cmh;
3470         struct sctp_sndinfo sndinfo;
3471         struct sctp_prinfo prinfo;
3472         struct sctp_authinfo authinfo;
3473         int tot_len, rem_len, cmsg_data_len, cmsg_data_off, off;
3474         int found;
3475
3476         /*
3477          * Independent of how many mbufs, find the c_type inside the control
3478          * structure and copy out the data.
3479          */
3480         found = 0;
3481         tot_len = SCTP_BUF_LEN(control);
3482         for (off = 0; off < tot_len; off += CMSG_ALIGN(cmh.cmsg_len)) {
3483                 rem_len = tot_len - off;
3484                 if (rem_len < (int)CMSG_ALIGN(sizeof(cmh))) {
3485                         /* There is not enough room for one more. */
3486                         return (found);
3487                 }
3488                 m_copydata(control, off, sizeof(cmh), (caddr_t)&cmh);
3489                 if (cmh.cmsg_len < CMSG_ALIGN(sizeof(cmh))) {
3490                         /* We dont't have a complete CMSG header. */
3491                         return (found);
3492                 }
3493                 if ((cmh.cmsg_len > INT_MAX) || ((int)cmh.cmsg_len > rem_len)) {
3494                         /* We don't have the complete CMSG. */
3495                         return (found);
3496                 }
3497                 cmsg_data_len = (int)cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh));
3498                 cmsg_data_off = off + CMSG_ALIGN(sizeof(cmh));
3499                 if ((cmh.cmsg_level == IPPROTO_SCTP) &&
3500                     ((c_type == cmh.cmsg_type) ||
3501                     ((c_type == SCTP_SNDRCV) &&
3502                     ((cmh.cmsg_type == SCTP_SNDINFO) ||
3503                     (cmh.cmsg_type == SCTP_PRINFO) ||
3504                     (cmh.cmsg_type == SCTP_AUTHINFO))))) {
3505                         if (c_type == cmh.cmsg_type) {
3506                                 if (cpsize > INT_MAX) {
3507                                         return (found);
3508                                 }
3509                                 if (cmsg_data_len < (int)cpsize) {
3510                                         return (found);
3511                                 }
3512                                 /* It is exactly what we want. Copy it out. */
3513                                 m_copydata(control, cmsg_data_off, (int)cpsize, (caddr_t)data);
3514                                 return (1);
3515                         } else {
3516                                 struct sctp_sndrcvinfo *sndrcvinfo;
3517
3518                                 sndrcvinfo = (struct sctp_sndrcvinfo *)data;
3519                                 if (found == 0) {
3520                                         if (cpsize < sizeof(struct sctp_sndrcvinfo)) {
3521                                                 return (found);
3522                                         }
3523                                         memset(sndrcvinfo, 0, sizeof(struct sctp_sndrcvinfo));
3524                                 }
3525                                 switch (cmh.cmsg_type) {
3526                                 case SCTP_SNDINFO:
3527                                         if (cmsg_data_len < (int)sizeof(struct sctp_sndinfo)) {
3528                                                 return (found);
3529                                         }
3530                                         m_copydata(control, cmsg_data_off, sizeof(struct sctp_sndinfo), (caddr_t)&sndinfo);
3531                                         sndrcvinfo->sinfo_stream = sndinfo.snd_sid;
3532                                         sndrcvinfo->sinfo_flags = sndinfo.snd_flags;
3533                                         sndrcvinfo->sinfo_ppid = sndinfo.snd_ppid;
3534                                         sndrcvinfo->sinfo_context = sndinfo.snd_context;
3535                                         sndrcvinfo->sinfo_assoc_id = sndinfo.snd_assoc_id;
3536                                         break;
3537                                 case SCTP_PRINFO:
3538                                         if (cmsg_data_len < (int)sizeof(struct sctp_prinfo)) {
3539                                                 return (found);
3540                                         }
3541                                         m_copydata(control, cmsg_data_off, sizeof(struct sctp_prinfo), (caddr_t)&prinfo);
3542                                         if (prinfo.pr_policy != SCTP_PR_SCTP_NONE) {
3543                                                 sndrcvinfo->sinfo_timetolive = prinfo.pr_value;
3544                                         } else {
3545                                                 sndrcvinfo->sinfo_timetolive = 0;
3546                                         }
3547                                         sndrcvinfo->sinfo_flags |= prinfo.pr_policy;
3548                                         break;
3549                                 case SCTP_AUTHINFO:
3550                                         if (cmsg_data_len < (int)sizeof(struct sctp_authinfo)) {
3551                                                 return (found);
3552                                         }
3553                                         m_copydata(control, cmsg_data_off, sizeof(struct sctp_authinfo), (caddr_t)&authinfo);
3554                                         sndrcvinfo->sinfo_keynumber_valid = 1;
3555                                         sndrcvinfo->sinfo_keynumber = authinfo.auth_keynumber;
3556                                         break;
3557                                 default:
3558                                         return (found);
3559                                 }
3560                                 found = 1;
3561                         }
3562                 }
3563         }
3564         return (found);
3565 }
3566
3567 static int
3568 sctp_process_cmsgs_for_init(struct sctp_tcb *stcb, struct mbuf *control, int *error)
3569 {
3570         struct cmsghdr cmh;
3571         int tlen, at;
3572         struct sctp_initmsg initmsg;
3573 #ifdef INET
3574         struct sockaddr_in sin;
3575 #endif
3576 #ifdef INET6
3577         struct sockaddr_in6 sin6;
3578 #endif
3579
3580         tlen = SCTP_BUF_LEN(control);
3581         at = 0;
3582         while (at < tlen) {
3583                 if ((tlen - at) < (int)CMSG_ALIGN(sizeof(cmh))) {
3584                         /* There is not enough room for one more. */
3585                         *error = EINVAL;
3586                         return (1);
3587                 }
3588                 m_copydata(control, at, sizeof(cmh), (caddr_t)&cmh);
3589                 if (cmh.cmsg_len < CMSG_ALIGN(sizeof(cmh))) {
3590                         /* We dont't have a complete CMSG header. */
3591                         *error = EINVAL;
3592                         return (1);
3593                 }
3594                 if (((int)cmh.cmsg_len + at) > tlen) {
3595                         /* We don't have the complete CMSG. */
3596                         *error = EINVAL;
3597                         return (1);
3598                 }
3599                 if (cmh.cmsg_level == IPPROTO_SCTP) {
3600                         switch (cmh.cmsg_type) {
3601                         case SCTP_INIT:
3602                                 if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh))) < sizeof(struct sctp_initmsg)) {
3603                                         *error = EINVAL;
3604                                         return (1);
3605                                 }
3606                                 m_copydata(control, at + CMSG_ALIGN(sizeof(cmh)), sizeof(struct sctp_initmsg), (caddr_t)&initmsg);
3607                                 if (initmsg.sinit_max_attempts)
3608                                         stcb->asoc.max_init_times = initmsg.sinit_max_attempts;
3609                                 if (initmsg.sinit_num_ostreams)
3610                                         stcb->asoc.pre_open_streams = initmsg.sinit_num_ostreams;
3611                                 if (initmsg.sinit_max_instreams)
3612                                         stcb->asoc.max_inbound_streams = initmsg.sinit_max_instreams;
3613                                 if (initmsg.sinit_max_init_timeo)
3614                                         stcb->asoc.initial_init_rto_max = initmsg.sinit_max_init_timeo;
3615                                 if (stcb->asoc.streamoutcnt < stcb->asoc.pre_open_streams) {
3616                                         struct sctp_stream_out *tmp_str;
3617                                         unsigned int i;
3618 #if defined(SCTP_DETAILED_STR_STATS)
3619                                         int j;
3620 #endif
3621
3622                                         /* Default is NOT correct */
3623                                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Ok, default:%d pre_open:%d\n",
3624                                             stcb->asoc.streamoutcnt, stcb->asoc.pre_open_streams);
3625                                         SCTP_TCB_UNLOCK(stcb);
3626                                         SCTP_MALLOC(tmp_str,
3627                                             struct sctp_stream_out *,
3628                                             (stcb->asoc.pre_open_streams * sizeof(struct sctp_stream_out)),
3629                                             SCTP_M_STRMO);
3630                                         SCTP_TCB_LOCK(stcb);
3631                                         if (tmp_str != NULL) {
3632                                                 SCTP_FREE(stcb->asoc.strmout, SCTP_M_STRMO);
3633                                                 stcb->asoc.strmout = tmp_str;
3634                                                 stcb->asoc.strm_realoutsize = stcb->asoc.streamoutcnt = stcb->asoc.pre_open_streams;
3635                                         } else {
3636                                                 stcb->asoc.pre_open_streams = stcb->asoc.streamoutcnt;
3637                                         }
3638                                         for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
3639                                                 TAILQ_INIT(&stcb->asoc.strmout[i].outqueue);
3640                                                 stcb->asoc.strmout[i].chunks_on_queues = 0;
3641                                                 stcb->asoc.strmout[i].next_mid_ordered = 0;
3642                                                 stcb->asoc.strmout[i].next_mid_unordered = 0;
3643 #if defined(SCTP_DETAILED_STR_STATS)
3644                                                 for (j = 0; j < SCTP_PR_SCTP_MAX + 1; j++) {
3645                                                         stcb->asoc.strmout[i].abandoned_sent[j] = 0;
3646                                                         stcb->asoc.strmout[i].abandoned_unsent[j] = 0;
3647                                                 }
3648 #else
3649                                                 stcb->asoc.strmout[i].abandoned_sent[0] = 0;
3650                                                 stcb->asoc.strmout[i].abandoned_unsent[0] = 0;
3651 #endif
3652                                                 stcb->asoc.strmout[i].sid = i;
3653                                                 stcb->asoc.strmout[i].last_msg_incomplete = 0;
3654                                                 stcb->asoc.strmout[i].state = SCTP_STREAM_OPENING;
3655                                                 stcb->asoc.ss_functions.sctp_ss_init_stream(stcb, &stcb->asoc.strmout[i], NULL);
3656                                         }
3657                                 }
3658                                 break;
3659 #ifdef INET
3660                         case SCTP_DSTADDRV4:
3661                                 if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh))) < sizeof(struct in_addr)) {
3662                                         *error = EINVAL;
3663                                         return (1);
3664                                 }
3665                                 memset(&sin, 0, sizeof(struct sockaddr_in));
3666                                 sin.sin_family = AF_INET;
3667                                 sin.sin_len = sizeof(struct sockaddr_in);
3668                                 sin.sin_port = stcb->rport;
3669                                 m_copydata(control, at + CMSG_ALIGN(sizeof(cmh)), sizeof(struct in_addr), (caddr_t)&sin.sin_addr);
3670                                 if ((sin.sin_addr.s_addr == INADDR_ANY) ||
3671                                     (sin.sin_addr.s_addr == INADDR_BROADCAST) ||
3672                                     IN_MULTICAST(ntohl(sin.sin_addr.s_addr))) {
3673                                         *error = EINVAL;
3674                                         return (1);
3675                                 }
3676                                 if (sctp_add_remote_addr(stcb, (struct sockaddr *)&sin, NULL, stcb->asoc.port,
3677                                     SCTP_DONOT_SETSCOPE, SCTP_ADDR_IS_CONFIRMED)) {
3678                                         *error = ENOBUFS;
3679                                         return (1);
3680                                 }
3681                                 break;
3682 #endif
3683 #ifdef INET6
3684                         case SCTP_DSTADDRV6:
3685                                 if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh))) < sizeof(struct in6_addr)) {
3686                                         *error = EINVAL;
3687                                         return (1);
3688                                 }
3689                                 memset(&sin6, 0, sizeof(struct sockaddr_in6));
3690                                 sin6.sin6_family = AF_INET6;
3691                                 sin6.sin6_len = sizeof(struct sockaddr_in6);
3692                                 sin6.sin6_port = stcb->rport;
3693                                 m_copydata(control, at + CMSG_ALIGN(sizeof(cmh)), sizeof(struct in6_addr), (caddr_t)&sin6.sin6_addr);
3694                                 if (IN6_IS_ADDR_UNSPECIFIED(&sin6.sin6_addr) ||
3695                                     IN6_IS_ADDR_MULTICAST(&sin6.sin6_addr)) {
3696                                         *error = EINVAL;
3697                                         return (1);
3698                                 }
3699 #ifdef INET
3700                                 if (IN6_IS_ADDR_V4MAPPED(&sin6.sin6_addr)) {
3701                                         in6_sin6_2_sin(&sin, &sin6);
3702                                         if ((sin.sin_addr.s_addr == INADDR_ANY) ||
3703                                             (sin.sin_addr.s_addr == INADDR_BROADCAST) ||
3704                                             IN_MULTICAST(ntohl(sin.sin_addr.s_addr))) {
3705                                                 *error = EINVAL;
3706                                                 return (1);
3707                                         }
3708                                         if (sctp_add_remote_addr(stcb, (struct sockaddr *)&sin, NULL, stcb->asoc.port,
3709                                             SCTP_DONOT_SETSCOPE, SCTP_ADDR_IS_CONFIRMED)) {
3710                                                 *error = ENOBUFS;
3711                                                 return (1);
3712                                         }
3713                                 } else
3714 #endif
3715                                         if (sctp_add_remote_addr(stcb, (struct sockaddr *)&sin6, NULL, stcb->asoc.port,
3716                                     SCTP_DONOT_SETSCOPE, SCTP_ADDR_IS_CONFIRMED)) {
3717                                         *error = ENOBUFS;
3718                                         return (1);
3719                                 }
3720                                 break;
3721 #endif
3722                         default:
3723                                 break;
3724                         }
3725                 }
3726                 at += CMSG_ALIGN(cmh.cmsg_len);
3727         }
3728         return (0);
3729 }
3730
3731 static struct sctp_tcb *
3732 sctp_findassociation_cmsgs(struct sctp_inpcb **inp_p,
3733     uint16_t port,
3734     struct mbuf *control,
3735     struct sctp_nets **net_p,
3736     int *error)
3737 {
3738         struct cmsghdr cmh;
3739         int tlen, at;
3740         struct sctp_tcb *stcb;
3741         struct sockaddr *addr;
3742 #ifdef INET
3743         struct sockaddr_in sin;
3744 #endif
3745 #ifdef INET6
3746         struct sockaddr_in6 sin6;
3747 #endif
3748
3749         tlen = SCTP_BUF_LEN(control);
3750         at = 0;
3751         while (at < tlen) {
3752                 if ((tlen - at) < (int)CMSG_ALIGN(sizeof(cmh))) {
3753                         /* There is not enough room for one more. */
3754                         *error = EINVAL;
3755                         return (NULL);
3756                 }
3757                 m_copydata(control, at, sizeof(cmh), (caddr_t)&cmh);
3758                 if (cmh.cmsg_len < CMSG_ALIGN(sizeof(cmh))) {
3759                         /* We dont't have a complete CMSG header. */
3760                         *error = EINVAL;
3761                         return (NULL);
3762                 }
3763                 if (((int)cmh.cmsg_len + at) > tlen) {
3764                         /* We don't have the complete CMSG. */
3765                         *error = EINVAL;
3766                         return (NULL);
3767                 }
3768                 if (cmh.cmsg_level == IPPROTO_SCTP) {
3769                         switch (cmh.cmsg_type) {
3770 #ifdef INET
3771                         case SCTP_DSTADDRV4:
3772                                 if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh))) < sizeof(struct in_addr)) {
3773                                         *error = EINVAL;
3774                                         return (NULL);
3775                                 }
3776                                 memset(&sin, 0, sizeof(struct sockaddr_in));
3777                                 sin.sin_family = AF_INET;
3778                                 sin.sin_len = sizeof(struct sockaddr_in);
3779                                 sin.sin_port = port;
3780                                 m_copydata(control, at + CMSG_ALIGN(sizeof(cmh)), sizeof(struct in_addr), (caddr_t)&sin.sin_addr);
3781                                 addr = (struct sockaddr *)&sin;
3782                                 break;
3783 #endif
3784 #ifdef INET6
3785                         case SCTP_DSTADDRV6:
3786                                 if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh))) < sizeof(struct in6_addr)) {
3787                                         *error = EINVAL;
3788                                         return (NULL);
3789                                 }
3790                                 memset(&sin6, 0, sizeof(struct sockaddr_in6));
3791                                 sin6.sin6_family = AF_INET6;
3792                                 sin6.sin6_len = sizeof(struct sockaddr_in6);
3793                                 sin6.sin6_port = port;
3794                                 m_copydata(control, at + CMSG_ALIGN(sizeof(cmh)), sizeof(struct in6_addr), (caddr_t)&sin6.sin6_addr);
3795 #ifdef INET
3796                                 if (IN6_IS_ADDR_V4MAPPED(&sin6.sin6_addr)) {
3797                                         in6_sin6_2_sin(&sin, &sin6);
3798                                         addr = (struct sockaddr *)&sin;
3799                                 } else
3800 #endif
3801                                         addr = (struct sockaddr *)&sin6;
3802                                 break;
3803 #endif
3804                         default:
3805                                 addr = NULL;
3806                                 break;
3807                         }
3808                         if (addr) {
3809                                 stcb = sctp_findassociation_ep_addr(inp_p, addr, net_p, NULL, NULL);
3810                                 if (stcb != NULL) {
3811                                         return (stcb);
3812                                 }
3813                         }
3814                 }
3815                 at += CMSG_ALIGN(cmh.cmsg_len);
3816         }
3817         return (NULL);
3818 }
3819
3820 static struct mbuf *
3821 sctp_add_cookie(struct mbuf *init, int init_offset,
3822     struct mbuf *initack, int initack_offset, struct sctp_state_cookie *stc_in, uint8_t **signature)
3823 {
3824         struct mbuf *copy_init, *copy_initack, *m_at, *sig, *mret;
3825         struct sctp_state_cookie *stc;
3826         struct sctp_paramhdr *ph;
3827         uint8_t *foo;
3828         int sig_offset;
3829         uint16_t cookie_sz;
3830
3831         mret = sctp_get_mbuf_for_msg((sizeof(struct sctp_state_cookie) +
3832             sizeof(struct sctp_paramhdr)), 0,
3833             M_NOWAIT, 1, MT_DATA);
3834         if (mret == NULL) {
3835                 return (NULL);
3836         }
3837         copy_init = SCTP_M_COPYM(init, init_offset, M_COPYALL, M_NOWAIT);
3838         if (copy_init == NULL) {
3839                 sctp_m_freem(mret);
3840                 return (NULL);
3841         }
3842 #ifdef SCTP_MBUF_LOGGING
3843         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
3844                 sctp_log_mbc(copy_init, SCTP_MBUF_ICOPY);
3845         }
3846 #endif
3847         copy_initack = SCTP_M_COPYM(initack, initack_offset, M_COPYALL,
3848             M_NOWAIT);
3849         if (copy_initack == NULL) {
3850                 sctp_m_freem(mret);
3851                 sctp_m_freem(copy_init);
3852                 return (NULL);
3853         }
3854 #ifdef SCTP_MBUF_LOGGING
3855         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
3856                 sctp_log_mbc(copy_initack, SCTP_MBUF_ICOPY);
3857         }
3858 #endif
3859         /* easy side we just drop it on the end */
3860         ph = mtod(mret, struct sctp_paramhdr *);
3861         SCTP_BUF_LEN(mret) = sizeof(struct sctp_state_cookie) +
3862             sizeof(struct sctp_paramhdr);
3863         stc = (struct sctp_state_cookie *)((caddr_t)ph +
3864             sizeof(struct sctp_paramhdr));
3865         ph->param_type = htons(SCTP_STATE_COOKIE);
3866         ph->param_length = 0;   /* fill in at the end */
3867         /* Fill in the stc cookie data */
3868         memcpy(stc, stc_in, sizeof(struct sctp_state_cookie));
3869
3870         /* tack the INIT and then the INIT-ACK onto the chain */
3871         cookie_sz = 0;
3872         for (m_at = mret; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
3873                 cookie_sz += SCTP_BUF_LEN(m_at);
3874                 if (SCTP_BUF_NEXT(m_at) == NULL) {
3875                         SCTP_BUF_NEXT(m_at) = copy_init;
3876                         break;
3877                 }
3878         }
3879         for (m_at = copy_init; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
3880                 cookie_sz += SCTP_BUF_LEN(m_at);
3881                 if (SCTP_BUF_NEXT(m_at) == NULL) {
3882                         SCTP_BUF_NEXT(m_at) = copy_initack;
3883                         break;
3884                 }
3885         }
3886         for (m_at = copy_initack; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
3887                 cookie_sz += SCTP_BUF_LEN(m_at);
3888                 if (SCTP_BUF_NEXT(m_at) == NULL) {
3889                         break;
3890                 }
3891         }
3892         sig = sctp_get_mbuf_for_msg(SCTP_SECRET_SIZE, 0, M_NOWAIT, 1, MT_DATA);
3893         if (sig == NULL) {
3894                 /* no space, so free the entire chain */
3895                 sctp_m_freem(mret);
3896                 return (NULL);
3897         }
3898         SCTP_BUF_LEN(sig) = 0;
3899         SCTP_BUF_NEXT(m_at) = sig;
3900         sig_offset = 0;
3901         foo = (uint8_t *)(mtod(sig, caddr_t)+sig_offset);
3902         memset(foo, 0, SCTP_SIGNATURE_SIZE);
3903         *signature = foo;
3904         SCTP_BUF_LEN(sig) += SCTP_SIGNATURE_SIZE;
3905         cookie_sz += SCTP_SIGNATURE_SIZE;
3906         ph->param_length = htons(cookie_sz);
3907         return (mret);
3908 }
3909
3910
3911 static uint8_t
3912 sctp_get_ect(struct sctp_tcb *stcb)
3913 {
3914         if ((stcb != NULL) && (stcb->asoc.ecn_supported == 1)) {
3915                 return (SCTP_ECT0_BIT);
3916         } else {
3917                 return (0);
3918         }
3919 }
3920
3921 #if defined(INET) || defined(INET6)
3922 static void
3923 sctp_handle_no_route(struct sctp_tcb *stcb,
3924     struct sctp_nets *net,
3925     int so_locked)
3926 {
3927         SCTPDBG(SCTP_DEBUG_OUTPUT1, "dropped packet - no valid source addr\n");
3928
3929         if (net) {
3930                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Destination was ");
3931                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT1, &net->ro._l_addr.sa);
3932                 if (net->dest_state & SCTP_ADDR_CONFIRMED) {
3933                         if ((net->dest_state & SCTP_ADDR_REACHABLE) && stcb) {
3934                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "no route takes interface %p down\n", (void *)net);
3935                                 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_DOWN,
3936                                     stcb, 0,
3937                                     (void *)net,
3938                                     so_locked);
3939                                 net->dest_state &= ~SCTP_ADDR_REACHABLE;
3940                                 net->dest_state &= ~SCTP_ADDR_PF;
3941                         }
3942                 }
3943                 if (stcb) {
3944                         if (net == stcb->asoc.primary_destination) {
3945                                 /* need a new primary */
3946                                 struct sctp_nets *alt;
3947
3948                                 alt = sctp_find_alternate_net(stcb, net, 0);
3949                                 if (alt != net) {
3950                                         if (stcb->asoc.alternate) {
3951                                                 sctp_free_remote_addr(stcb->asoc.alternate);
3952                                         }
3953                                         stcb->asoc.alternate = alt;
3954                                         atomic_add_int(&stcb->asoc.alternate->ref_count, 1);
3955                                         if (net->ro._s_addr) {
3956                                                 sctp_free_ifa(net->ro._s_addr);
3957                                                 net->ro._s_addr = NULL;
3958                                         }
3959                                         net->src_addr_selected = 0;
3960                                 }
3961                         }
3962                 }
3963         }
3964 }
3965 #endif
3966
3967 static int
3968 sctp_lowlevel_chunk_output(struct sctp_inpcb *inp,
3969     struct sctp_tcb *stcb,      /* may be NULL */
3970     struct sctp_nets *net,
3971     struct sockaddr *to,
3972     struct mbuf *m,
3973     uint32_t auth_offset,
3974     struct sctp_auth_chunk *auth,
3975     uint16_t auth_keyid,
3976     int nofragment_flag,
3977     int ecn_ok,
3978     int out_of_asoc_ok,
3979     uint16_t src_port,
3980     uint16_t dest_port,
3981     uint32_t v_tag,
3982     uint16_t port,
3983     union sctp_sockstore *over_addr,
3984     uint8_t mflowtype, uint32_t mflowid,
3985 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
3986     int so_locked SCTP_UNUSED
3987 #else
3988     int so_locked
3989 #endif
3990 )
3991 /* nofragment_flag to tell if IP_DF should be set (IPv4 only) */
3992 {
3993         /**
3994          * Given a mbuf chain (via SCTP_BUF_NEXT()) that holds a packet header
3995          * WITH an SCTPHDR but no IP header, endpoint inp and sa structure:
3996          * - fill in the HMAC digest of any AUTH chunk in the packet.
3997          * - calculate and fill in the SCTP checksum.
3998          * - prepend an IP address header.
3999          * - if boundall use INADDR_ANY.
4000          * - if boundspecific do source address selection.
4001          * - set fragmentation option for ipV4.
4002          * - On return from IP output, check/adjust mtu size of output
4003          *   interface and smallest_mtu size as well.
4004          */
4005         /* Will need ifdefs around this */
4006         struct mbuf *newm;
4007         struct sctphdr *sctphdr;
4008         int packet_length;
4009         int ret;
4010 #if defined(INET) || defined(INET6)
4011         uint32_t vrf_id;
4012 #endif
4013 #if defined(INET) || defined(INET6)
4014         struct mbuf *o_pak;
4015         sctp_route_t *ro = NULL;
4016         struct udphdr *udp = NULL;
4017 #endif
4018         uint8_t tos_value;
4019 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4020         struct socket *so = NULL;
4021 #endif
4022
4023         if ((net) && (net->dest_state & SCTP_ADDR_OUT_OF_SCOPE)) {
4024                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EFAULT);
4025                 sctp_m_freem(m);
4026                 return (EFAULT);
4027         }
4028 #if defined(INET) || defined(INET6)
4029         if (stcb) {
4030                 vrf_id = stcb->asoc.vrf_id;
4031         } else {
4032                 vrf_id = inp->def_vrf_id;
4033         }
4034 #endif
4035         /* fill in the HMAC digest for any AUTH chunk in the packet */
4036         if ((auth != NULL) && (stcb != NULL)) {
4037                 sctp_fill_hmac_digest_m(m, auth_offset, auth, stcb, auth_keyid);
4038         }
4039         if (net) {
4040                 tos_value = net->dscp;
4041         } else if (stcb) {
4042                 tos_value = stcb->asoc.default_dscp;
4043         } else {
4044                 tos_value = inp->sctp_ep.default_dscp;
4045         }
4046
4047         switch (to->sa_family) {
4048 #ifdef INET
4049         case AF_INET:
4050                 {
4051                         struct ip *ip = NULL;
4052                         sctp_route_t iproute;
4053                         int len;
4054
4055                         len = SCTP_MIN_V4_OVERHEAD;
4056                         if (port) {
4057                                 len += sizeof(struct udphdr);
4058                         }
4059                         newm = sctp_get_mbuf_for_msg(len, 1, M_NOWAIT, 1, MT_DATA);
4060                         if (newm == NULL) {
4061                                 sctp_m_freem(m);
4062                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
4063                                 return (ENOMEM);
4064                         }
4065                         SCTP_ALIGN_TO_END(newm, len);
4066                         SCTP_BUF_LEN(newm) = len;
4067                         SCTP_BUF_NEXT(newm) = m;
4068                         m = newm;
4069                         if (net != NULL) {
4070                                 m->m_pkthdr.flowid = net->flowid;
4071                                 M_HASHTYPE_SET(m, net->flowtype);
4072                         } else {
4073                                 m->m_pkthdr.flowid = mflowid;
4074                                 M_HASHTYPE_SET(m, mflowtype);
4075                         }
4076                         packet_length = sctp_calculate_len(m);
4077                         ip = mtod(m, struct ip *);
4078                         ip->ip_v = IPVERSION;
4079                         ip->ip_hl = (sizeof(struct ip) >> 2);
4080                         if (tos_value == 0) {
4081                                 /*
4082                                  * This means especially, that it is not set
4083                                  * at the SCTP layer. So use the value from
4084                                  * the IP layer.
4085                                  */
4086                                 tos_value = inp->ip_inp.inp.inp_ip_tos;
4087                         }
4088                         tos_value &= 0xfc;
4089                         if (ecn_ok) {
4090                                 tos_value |= sctp_get_ect(stcb);
4091                         }
4092                         if ((nofragment_flag) && (port == 0)) {
4093                                 ip->ip_off = htons(IP_DF);
4094                         } else {
4095                                 ip->ip_off = htons(0);
4096                         }
4097                         /* FreeBSD has a function for ip_id's */
4098                         ip_fillid(ip);
4099
4100                         ip->ip_ttl = inp->ip_inp.inp.inp_ip_ttl;
4101                         ip->ip_len = htons(packet_length);
4102                         ip->ip_tos = tos_value;
4103                         if (port) {
4104                                 ip->ip_p = IPPROTO_UDP;
4105                         } else {
4106                                 ip->ip_p = IPPROTO_SCTP;
4107                         }
4108                         ip->ip_sum = 0;
4109                         if (net == NULL) {
4110                                 ro = &iproute;
4111                                 memset(&iproute, 0, sizeof(iproute));
4112                                 memcpy(&ro->ro_dst, to, to->sa_len);
4113                         } else {
4114                                 ro = (sctp_route_t *)&net->ro;
4115                         }
4116                         /* Now the address selection part */
4117                         ip->ip_dst.s_addr = ((struct sockaddr_in *)to)->sin_addr.s_addr;
4118
4119                         /* call the routine to select the src address */
4120                         if (net && out_of_asoc_ok == 0) {
4121                                 if (net->ro._s_addr && (net->ro._s_addr->localifa_flags & (SCTP_BEING_DELETED | SCTP_ADDR_IFA_UNUSEABLE))) {
4122                                         sctp_free_ifa(net->ro._s_addr);
4123                                         net->ro._s_addr = NULL;
4124                                         net->src_addr_selected = 0;
4125                                         if (ro->ro_rt) {
4126                                                 RTFREE(ro->ro_rt);
4127                                                 ro->ro_rt = NULL;
4128                                         }
4129                                 }
4130                                 if (net->src_addr_selected == 0) {
4131                                         /* Cache the source address */
4132                                         net->ro._s_addr = sctp_source_address_selection(inp, stcb,
4133                                             ro, net, 0,
4134                                             vrf_id);
4135                                         net->src_addr_selected = 1;
4136                                 }
4137                                 if (net->ro._s_addr == NULL) {
4138                                         /* No route to host */
4139                                         net->src_addr_selected = 0;
4140                                         sctp_handle_no_route(stcb, net, so_locked);
4141                                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4142                                         sctp_m_freem(m);
4143                                         return (EHOSTUNREACH);
4144                                 }
4145                                 ip->ip_src = net->ro._s_addr->address.sin.sin_addr;
4146                         } else {
4147                                 if (over_addr == NULL) {
4148                                         struct sctp_ifa *_lsrc;
4149
4150                                         _lsrc = sctp_source_address_selection(inp, stcb, ro,
4151                                             net,
4152                                             out_of_asoc_ok,
4153                                             vrf_id);
4154                                         if (_lsrc == NULL) {
4155                                                 sctp_handle_no_route(stcb, net, so_locked);
4156                                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4157                                                 sctp_m_freem(m);
4158                                                 return (EHOSTUNREACH);
4159                                         }
4160                                         ip->ip_src = _lsrc->address.sin.sin_addr;
4161                                         sctp_free_ifa(_lsrc);
4162                                 } else {
4163                                         ip->ip_src = over_addr->sin.sin_addr;
4164                                         SCTP_RTALLOC(ro, vrf_id, inp->fibnum);
4165                                 }
4166                         }
4167                         if (port) {
4168                                 if (htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port)) == 0) {
4169                                         sctp_handle_no_route(stcb, net, so_locked);
4170                                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4171                                         sctp_m_freem(m);
4172                                         return (EHOSTUNREACH);
4173                                 }
4174                                 udp = (struct udphdr *)((caddr_t)ip + sizeof(struct ip));
4175                                 udp->uh_sport = htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port));
4176                                 udp->uh_dport = port;
4177                                 udp->uh_ulen = htons((uint16_t)(packet_length - sizeof(struct ip)));
4178                                 if (V_udp_cksum) {
4179                                         udp->uh_sum = in_pseudo(ip->ip_src.s_addr, ip->ip_dst.s_addr, udp->uh_ulen + htons(IPPROTO_UDP));
4180                                 } else {
4181                                         udp->uh_sum = 0;
4182                                 }
4183                                 sctphdr = (struct sctphdr *)((caddr_t)udp + sizeof(struct udphdr));
4184                         } else {
4185                                 sctphdr = (struct sctphdr *)((caddr_t)ip + sizeof(struct ip));
4186                         }
4187
4188                         sctphdr->src_port = src_port;
4189                         sctphdr->dest_port = dest_port;
4190                         sctphdr->v_tag = v_tag;
4191                         sctphdr->checksum = 0;
4192
4193                         /*
4194                          * If source address selection fails and we find no
4195                          * route then the ip_output should fail as well with
4196                          * a NO_ROUTE_TO_HOST type error. We probably should
4197                          * catch that somewhere and abort the association
4198                          * right away (assuming this is an INIT being sent).
4199                          */
4200                         if (ro->ro_rt == NULL) {
4201                                 /*
4202                                  * src addr selection failed to find a route
4203                                  * (or valid source addr), so we can't get
4204                                  * there from here (yet)!
4205                                  */
4206                                 sctp_handle_no_route(stcb, net, so_locked);
4207                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4208                                 sctp_m_freem(m);
4209                                 return (EHOSTUNREACH);
4210                         }
4211                         if (ro != &iproute) {
4212                                 memcpy(&iproute, ro, sizeof(*ro));
4213                         }
4214                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "Calling ipv4 output routine from low level src addr:%x\n",
4215                             (uint32_t)(ntohl(ip->ip_src.s_addr)));
4216                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "Destination is %x\n",
4217                             (uint32_t)(ntohl(ip->ip_dst.s_addr)));
4218                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "RTP route is %p through\n",
4219                             (void *)ro->ro_rt);
4220
4221                         if (SCTP_GET_HEADER_FOR_OUTPUT(o_pak)) {
4222                                 /* failed to prepend data, give up */
4223                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
4224                                 sctp_m_freem(m);
4225                                 return (ENOMEM);
4226                         }
4227                         SCTP_ATTACH_CHAIN(o_pak, m, packet_length);
4228                         if (port) {
4229                                 sctphdr->checksum = sctp_calculate_cksum(m, sizeof(struct ip) + sizeof(struct udphdr));
4230                                 SCTP_STAT_INCR(sctps_sendswcrc);
4231                                 if (V_udp_cksum) {
4232                                         SCTP_ENABLE_UDP_CSUM(o_pak);
4233                                 }
4234                         } else {
4235                                 m->m_pkthdr.csum_flags = CSUM_SCTP;
4236                                 m->m_pkthdr.csum_data = offsetof(struct sctphdr, checksum);
4237                                 SCTP_STAT_INCR(sctps_sendhwcrc);
4238                         }
4239 #ifdef SCTP_PACKET_LOGGING
4240                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING)
4241                                 sctp_packet_log(o_pak);
4242 #endif
4243                         /* send it out.  table id is taken from stcb */
4244 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4245                         if ((SCTP_BASE_SYSCTL(sctp_output_unlocked)) && (so_locked)) {
4246                                 so = SCTP_INP_SO(inp);
4247                                 SCTP_SOCKET_UNLOCK(so, 0);
4248                         }
4249 #endif
4250                         SCTP_IP_OUTPUT(ret, o_pak, ro, stcb, vrf_id);
4251 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4252                         if ((SCTP_BASE_SYSCTL(sctp_output_unlocked)) && (so_locked)) {
4253                                 atomic_add_int(&stcb->asoc.refcnt, 1);
4254                                 SCTP_TCB_UNLOCK(stcb);
4255                                 SCTP_SOCKET_LOCK(so, 0);
4256                                 SCTP_TCB_LOCK(stcb);
4257                                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
4258                         }
4259 #endif
4260                         SCTP_STAT_INCR(sctps_sendpackets);
4261                         SCTP_STAT_INCR_COUNTER64(sctps_outpackets);
4262                         if (ret)
4263                                 SCTP_STAT_INCR(sctps_senderrors);
4264
4265                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "IP output returns %d\n", ret);
4266                         if (net == NULL) {
4267                                 /* free tempy routes */
4268                                 RO_RTFREE(ro);
4269                         } else {
4270                                 if ((ro->ro_rt != NULL) && (net->ro._s_addr) &&
4271                                     ((net->dest_state & SCTP_ADDR_NO_PMTUD) == 0)) {
4272                                         uint32_t mtu;
4273
4274                                         mtu = SCTP_GATHER_MTU_FROM_ROUTE(net->ro._s_addr, &net->ro._l_addr.sa, ro->ro_rt);
4275                                         if (mtu > 0) {
4276                                                 if (net->port) {
4277                                                         mtu -= sizeof(struct udphdr);
4278                                                 }
4279                                                 if ((stcb != NULL) && (stcb->asoc.smallest_mtu > mtu)) {
4280                                                         sctp_mtu_size_reset(inp, &stcb->asoc, mtu);
4281                                                 }
4282                                                 net->mtu = mtu;
4283                                         }
4284                                 } else if (ro->ro_rt == NULL) {
4285                                         /* route was freed */
4286                                         if (net->ro._s_addr &&
4287                                             net->src_addr_selected) {
4288                                                 sctp_free_ifa(net->ro._s_addr);
4289                                                 net->ro._s_addr = NULL;
4290                                         }
4291                                         net->src_addr_selected = 0;
4292                                 }
4293                         }
4294                         return (ret);
4295                 }
4296 #endif
4297 #ifdef INET6
4298         case AF_INET6:
4299                 {
4300                         uint32_t flowlabel, flowinfo;
4301                         struct ip6_hdr *ip6h;
4302                         struct route_in6 ip6route;
4303                         struct ifnet *ifp;
4304                         struct sockaddr_in6 *sin6, tmp, *lsa6, lsa6_tmp;
4305                         int prev_scope = 0;
4306                         struct sockaddr_in6 lsa6_storage;
4307                         int error;
4308                         u_short prev_port = 0;
4309                         int len;
4310
4311                         if (net) {
4312                                 flowlabel = net->flowlabel;
4313                         } else if (stcb) {
4314                                 flowlabel = stcb->asoc.default_flowlabel;
4315                         } else {
4316                                 flowlabel = inp->sctp_ep.default_flowlabel;
4317                         }
4318                         if (flowlabel == 0) {
4319                                 /*
4320                                  * This means especially, that it is not set
4321                                  * at the SCTP layer. So use the value from
4322                                  * the IP layer.
4323                                  */
4324                                 flowlabel = ntohl(((struct in6pcb *)inp)->in6p_flowinfo);
4325                         }
4326                         flowlabel &= 0x000fffff;
4327                         len = SCTP_MIN_OVERHEAD;
4328                         if (port) {
4329                                 len += sizeof(struct udphdr);
4330                         }
4331                         newm = sctp_get_mbuf_for_msg(len, 1, M_NOWAIT, 1, MT_DATA);
4332                         if (newm == NULL) {
4333                                 sctp_m_freem(m);
4334                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
4335                                 return (ENOMEM);
4336                         }
4337                         SCTP_ALIGN_TO_END(newm, len);
4338                         SCTP_BUF_LEN(newm) = len;
4339                         SCTP_BUF_NEXT(newm) = m;
4340                         m = newm;
4341                         if (net != NULL) {
4342                                 m->m_pkthdr.flowid = net->flowid;
4343                                 M_HASHTYPE_SET(m, net->flowtype);
4344                         } else {
4345                                 m->m_pkthdr.flowid = mflowid;
4346                                 M_HASHTYPE_SET(m, mflowtype);
4347                         }
4348                         packet_length = sctp_calculate_len(m);
4349
4350                         ip6h = mtod(m, struct ip6_hdr *);
4351                         /* protect *sin6 from overwrite */
4352                         sin6 = (struct sockaddr_in6 *)to;
4353                         tmp = *sin6;
4354                         sin6 = &tmp;
4355
4356                         /* KAME hack: embed scopeid */
4357                         if (sa6_embedscope(sin6, MODULE_GLOBAL(ip6_use_defzone)) != 0) {
4358                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
4359                                 return (EINVAL);
4360                         }
4361                         if (net == NULL) {
4362                                 memset(&ip6route, 0, sizeof(ip6route));
4363                                 ro = (sctp_route_t *)&ip6route;
4364                                 memcpy(&ro->ro_dst, sin6, sin6->sin6_len);
4365                         } else {
4366                                 ro = (sctp_route_t *)&net->ro;
4367                         }
4368                         /*
4369                          * We assume here that inp_flow is in host byte
4370                          * order within the TCB!
4371                          */
4372                         if (tos_value == 0) {
4373                                 /*
4374                                  * This means especially, that it is not set
4375                                  * at the SCTP layer. So use the value from
4376                                  * the IP layer.
4377                                  */
4378                                 tos_value = (ntohl(((struct in6pcb *)inp)->in6p_flowinfo) >> 20) & 0xff;
4379                         }
4380                         tos_value &= 0xfc;
4381                         if (ecn_ok) {
4382                                 tos_value |= sctp_get_ect(stcb);
4383                         }
4384                         flowinfo = 0x06;
4385                         flowinfo <<= 8;
4386                         flowinfo |= tos_value;
4387                         flowinfo <<= 20;
4388                         flowinfo |= flowlabel;
4389                         ip6h->ip6_flow = htonl(flowinfo);
4390                         if (port) {
4391                                 ip6h->ip6_nxt = IPPROTO_UDP;
4392                         } else {
4393                                 ip6h->ip6_nxt = IPPROTO_SCTP;
4394                         }
4395                         ip6h->ip6_plen = (uint16_t)(packet_length - sizeof(struct ip6_hdr));
4396                         ip6h->ip6_dst = sin6->sin6_addr;
4397
4398                         /*
4399                          * Add SRC address selection here: we can only reuse
4400                          * to a limited degree the kame src-addr-sel, since
4401                          * we can try their selection but it may not be
4402                          * bound.
4403                          */
4404                         memset(&lsa6_tmp, 0, sizeof(lsa6_tmp));
4405                         lsa6_tmp.sin6_family = AF_INET6;
4406                         lsa6_tmp.sin6_len = sizeof(lsa6_tmp);
4407                         lsa6 = &lsa6_tmp;
4408                         if (net && out_of_asoc_ok == 0) {
4409                                 if (net->ro._s_addr && (net->ro._s_addr->localifa_flags & (SCTP_BEING_DELETED | SCTP_ADDR_IFA_UNUSEABLE))) {
4410                                         sctp_free_ifa(net->ro._s_addr);
4411                                         net->ro._s_addr = NULL;
4412                                         net->src_addr_selected = 0;
4413                                         if (ro->ro_rt) {
4414                                                 RTFREE(ro->ro_rt);
4415                                                 ro->ro_rt = NULL;
4416                                         }
4417                                 }
4418                                 if (net->src_addr_selected == 0) {
4419                                         sin6 = (struct sockaddr_in6 *)&net->ro._l_addr;
4420                                         /* KAME hack: embed scopeid */
4421                                         if (sa6_embedscope(sin6, MODULE_GLOBAL(ip6_use_defzone)) != 0) {
4422                                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
4423                                                 return (EINVAL);
4424                                         }
4425                                         /* Cache the source address */
4426                                         net->ro._s_addr = sctp_source_address_selection(inp,
4427                                             stcb,
4428                                             ro,
4429                                             net,
4430                                             0,
4431                                             vrf_id);
4432                                         (void)sa6_recoverscope(sin6);
4433                                         net->src_addr_selected = 1;
4434                                 }
4435                                 if (net->ro._s_addr == NULL) {
4436                                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "V6:No route to host\n");
4437                                         net->src_addr_selected = 0;
4438                                         sctp_handle_no_route(stcb, net, so_locked);
4439                                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4440                                         sctp_m_freem(m);
4441                                         return (EHOSTUNREACH);
4442                                 }
4443                                 lsa6->sin6_addr = net->ro._s_addr->address.sin6.sin6_addr;
4444                         } else {
4445                                 sin6 = (struct sockaddr_in6 *)&ro->ro_dst;
4446                                 /* KAME hack: embed scopeid */
4447                                 if (sa6_embedscope(sin6, MODULE_GLOBAL(ip6_use_defzone)) != 0) {
4448                                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
4449                                         return (EINVAL);
4450                                 }
4451                                 if (over_addr == NULL) {
4452                                         struct sctp_ifa *_lsrc;
4453
4454                                         _lsrc = sctp_source_address_selection(inp, stcb, ro,
4455                                             net,
4456                                             out_of_asoc_ok,
4457                                             vrf_id);
4458                                         if (_lsrc == NULL) {
4459                                                 sctp_handle_no_route(stcb, net, so_locked);
4460                                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4461                                                 sctp_m_freem(m);
4462                                                 return (EHOSTUNREACH);
4463                                         }
4464                                         lsa6->sin6_addr = _lsrc->address.sin6.sin6_addr;
4465                                         sctp_free_ifa(_lsrc);
4466                                 } else {
4467                                         lsa6->sin6_addr = over_addr->sin6.sin6_addr;
4468                                         SCTP_RTALLOC(ro, vrf_id, inp->fibnum);
4469                                 }
4470                                 (void)sa6_recoverscope(sin6);
4471                         }
4472                         lsa6->sin6_port = inp->sctp_lport;
4473
4474                         if (ro->ro_rt == NULL) {
4475                                 /*
4476                                  * src addr selection failed to find a route
4477                                  * (or valid source addr), so we can't get
4478                                  * there from here!
4479                                  */
4480                                 sctp_handle_no_route(stcb, net, so_locked);
4481                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4482                                 sctp_m_freem(m);
4483                                 return (EHOSTUNREACH);
4484                         }
4485                         /*
4486                          * XXX: sa6 may not have a valid sin6_scope_id in
4487                          * the non-SCOPEDROUTING case.
4488                          */
4489                         memset(&lsa6_storage, 0, sizeof(lsa6_storage));
4490                         lsa6_storage.sin6_family = AF_INET6;
4491                         lsa6_storage.sin6_len = sizeof(lsa6_storage);
4492                         lsa6_storage.sin6_addr = lsa6->sin6_addr;
4493                         if ((error = sa6_recoverscope(&lsa6_storage)) != 0) {
4494                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "recover scope fails error %d\n", error);
4495                                 sctp_m_freem(m);
4496                                 return (error);
4497                         }
4498                         /* XXX */
4499                         lsa6_storage.sin6_addr = lsa6->sin6_addr;
4500                         lsa6_storage.sin6_port = inp->sctp_lport;
4501                         lsa6 = &lsa6_storage;
4502                         ip6h->ip6_src = lsa6->sin6_addr;
4503
4504                         if (port) {
4505                                 if (htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port)) == 0) {
4506                                         sctp_handle_no_route(stcb, net, so_locked);
4507                                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4508                                         sctp_m_freem(m);
4509                                         return (EHOSTUNREACH);
4510                                 }
4511                                 udp = (struct udphdr *)((caddr_t)ip6h + sizeof(struct ip6_hdr));
4512                                 udp->uh_sport = htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port));
4513                                 udp->uh_dport = port;
4514                                 udp->uh_ulen = htons((uint16_t)(packet_length - sizeof(struct ip6_hdr)));
4515                                 udp->uh_sum = 0;
4516                                 sctphdr = (struct sctphdr *)((caddr_t)udp + sizeof(struct udphdr));
4517                         } else {
4518                                 sctphdr = (struct sctphdr *)((caddr_t)ip6h + sizeof(struct ip6_hdr));
4519                         }
4520
4521                         sctphdr->src_port = src_port;
4522                         sctphdr->dest_port = dest_port;
4523                         sctphdr->v_tag = v_tag;
4524                         sctphdr->checksum = 0;
4525
4526                         /*
4527                          * We set the hop limit now since there is a good
4528                          * chance that our ro pointer is now filled
4529                          */
4530                         ip6h->ip6_hlim = SCTP_GET_HLIM(inp, ro);
4531                         ifp = SCTP_GET_IFN_VOID_FROM_ROUTE(ro);
4532
4533 #ifdef SCTP_DEBUG
4534                         /* Copy to be sure something bad is not happening */
4535                         sin6->sin6_addr = ip6h->ip6_dst;
4536                         lsa6->sin6_addr = ip6h->ip6_src;
4537 #endif
4538
4539                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "Calling ipv6 output routine from low level\n");
4540                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "src: ");
4541                         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT3, (struct sockaddr *)lsa6);
4542                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "dst: ");
4543                         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT3, (struct sockaddr *)sin6);
4544                         if (net) {
4545                                 sin6 = (struct sockaddr_in6 *)&net->ro._l_addr;
4546                                 /*
4547                                  * preserve the port and scope for link
4548                                  * local send
4549                                  */
4550                                 prev_scope = sin6->sin6_scope_id;
4551                                 prev_port = sin6->sin6_port;
4552                         }
4553                         if (SCTP_GET_HEADER_FOR_OUTPUT(o_pak)) {
4554                                 /* failed to prepend data, give up */
4555                                 sctp_m_freem(m);
4556                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
4557                                 return (ENOMEM);
4558                         }
4559                         SCTP_ATTACH_CHAIN(o_pak, m, packet_length);
4560                         if (port) {
4561                                 sctphdr->checksum = sctp_calculate_cksum(m, sizeof(struct ip6_hdr) + sizeof(struct udphdr));
4562                                 SCTP_STAT_INCR(sctps_sendswcrc);
4563                                 if ((udp->uh_sum = in6_cksum(o_pak, IPPROTO_UDP, sizeof(struct ip6_hdr), packet_length - sizeof(struct ip6_hdr))) == 0) {
4564                                         udp->uh_sum = 0xffff;
4565                                 }
4566                         } else {
4567                                 m->m_pkthdr.csum_flags = CSUM_SCTP_IPV6;
4568                                 m->m_pkthdr.csum_data = offsetof(struct sctphdr, checksum);
4569                                 SCTP_STAT_INCR(sctps_sendhwcrc);
4570                         }
4571                         /* send it out. table id is taken from stcb */
4572 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4573                         if ((SCTP_BASE_SYSCTL(sctp_output_unlocked)) && (so_locked)) {
4574                                 so = SCTP_INP_SO(inp);
4575                                 SCTP_SOCKET_UNLOCK(so, 0);
4576                         }
4577 #endif
4578 #ifdef SCTP_PACKET_LOGGING
4579                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING)
4580                                 sctp_packet_log(o_pak);
4581 #endif
4582                         SCTP_IP6_OUTPUT(ret, o_pak, (struct route_in6 *)ro, &ifp, stcb, vrf_id);
4583 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4584                         if ((SCTP_BASE_SYSCTL(sctp_output_unlocked)) && (so_locked)) {
4585                                 atomic_add_int(&stcb->asoc.refcnt, 1);
4586                                 SCTP_TCB_UNLOCK(stcb);
4587                                 SCTP_SOCKET_LOCK(so, 0);
4588                                 SCTP_TCB_LOCK(stcb);
4589                                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
4590                         }
4591 #endif
4592                         if (net) {
4593                                 /* for link local this must be done */
4594                                 sin6->sin6_scope_id = prev_scope;
4595                                 sin6->sin6_port = prev_port;
4596                         }
4597                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "return from send is %d\n", ret);
4598                         SCTP_STAT_INCR(sctps_sendpackets);
4599                         SCTP_STAT_INCR_COUNTER64(sctps_outpackets);
4600                         if (ret) {
4601                                 SCTP_STAT_INCR(sctps_senderrors);
4602                         }
4603                         if (net == NULL) {
4604                                 /* Now if we had a temp route free it */
4605                                 RO_RTFREE(ro);
4606                         } else {
4607                                 /*
4608                                  * PMTU check versus smallest asoc MTU goes
4609                                  * here
4610                                  */
4611                                 if (ro->ro_rt == NULL) {
4612                                         /* Route was freed */
4613                                         if (net->ro._s_addr &&
4614                                             net->src_addr_selected) {
4615                                                 sctp_free_ifa(net->ro._s_addr);
4616                                                 net->ro._s_addr = NULL;
4617                                         }
4618                                         net->src_addr_selected = 0;
4619                                 }
4620                                 if ((ro->ro_rt != NULL) && (net->ro._s_addr) &&
4621                                     ((net->dest_state & SCTP_ADDR_NO_PMTUD) == 0)) {
4622                                         uint32_t mtu;
4623
4624                                         mtu = SCTP_GATHER_MTU_FROM_ROUTE(net->ro._s_addr, &net->ro._l_addr.sa, ro->ro_rt);
4625                                         if (mtu > 0) {
4626                                                 if (net->port) {
4627                                                         mtu -= sizeof(struct udphdr);
4628                                                 }
4629                                                 if ((stcb != NULL) && (stcb->asoc.smallest_mtu > mtu)) {
4630                                                         sctp_mtu_size_reset(inp, &stcb->asoc, mtu);
4631                                                 }
4632                                                 net->mtu = mtu;
4633                                         }
4634                                 } else if (ifp) {
4635                                         if (ND_IFINFO(ifp)->linkmtu &&
4636                                             (stcb->asoc.smallest_mtu > ND_IFINFO(ifp)->linkmtu)) {
4637                                                 sctp_mtu_size_reset(inp,
4638                                                     &stcb->asoc,
4639                                                     ND_IFINFO(ifp)->linkmtu);
4640                                         }
4641                                 }
4642                         }
4643                         return (ret);
4644                 }
4645 #endif
4646         default:
4647                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Unknown protocol (TSNH) type %d\n",
4648                     ((struct sockaddr *)to)->sa_family);
4649                 sctp_m_freem(m);
4650                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EFAULT);
4651                 return (EFAULT);
4652         }
4653 }
4654
4655
4656 void
4657 sctp_send_initiate(struct sctp_inpcb *inp, struct sctp_tcb *stcb, int so_locked
4658 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
4659     SCTP_UNUSED
4660 #endif
4661 )
4662 {
4663         struct mbuf *m, *m_last;
4664         struct sctp_nets *net;
4665         struct sctp_init_chunk *init;
4666         struct sctp_supported_addr_param *sup_addr;
4667         struct sctp_adaptation_layer_indication *ali;
4668         struct sctp_supported_chunk_types_param *pr_supported;
4669         struct sctp_paramhdr *ph;
4670         int cnt_inits_to = 0;
4671         int error;
4672         uint16_t num_ext, chunk_len, padding_len, parameter_len;
4673
4674         /* INIT's always go to the primary (and usually ONLY address) */
4675         net = stcb->asoc.primary_destination;
4676         if (net == NULL) {
4677                 net = TAILQ_FIRST(&stcb->asoc.nets);
4678                 if (net == NULL) {
4679                         /* TSNH */
4680                         return;
4681                 }
4682                 /* we confirm any address we send an INIT to */
4683                 net->dest_state &= ~SCTP_ADDR_UNCONFIRMED;
4684                 (void)sctp_set_primary_addr(stcb, NULL, net);
4685         } else {
4686                 /* we confirm any address we send an INIT to */
4687                 net->dest_state &= ~SCTP_ADDR_UNCONFIRMED;
4688         }
4689         SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT\n");
4690 #ifdef INET6
4691         if (net->ro._l_addr.sa.sa_family == AF_INET6) {
4692                 /*
4693                  * special hook, if we are sending to link local it will not
4694                  * show up in our private address count.
4695                  */
4696                 if (IN6_IS_ADDR_LINKLOCAL(&net->ro._l_addr.sin6.sin6_addr))
4697                         cnt_inits_to = 1;
4698         }
4699 #endif
4700         if (SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
4701                 /* This case should not happen */
4702                 SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT - failed timer?\n");
4703                 return;
4704         }
4705         /* start the INIT timer */
4706         sctp_timer_start(SCTP_TIMER_TYPE_INIT, inp, stcb, net);
4707
4708         m = sctp_get_mbuf_for_msg(MCLBYTES, 1, M_NOWAIT, 1, MT_DATA);
4709         if (m == NULL) {
4710                 /* No memory, INIT timer will re-attempt. */
4711                 SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT - mbuf?\n");
4712                 return;
4713         }
4714         chunk_len = (uint16_t)sizeof(struct sctp_init_chunk);
4715         padding_len = 0;
4716         /* Now lets put the chunk header in place */
4717         init = mtod(m, struct sctp_init_chunk *);
4718         /* now the chunk header */
4719         init->ch.chunk_type = SCTP_INITIATION;
4720         init->ch.chunk_flags = 0;
4721         /* fill in later from mbuf we build */
4722         init->ch.chunk_length = 0;
4723         /* place in my tag */
4724         init->init.initiate_tag = htonl(stcb->asoc.my_vtag);
4725         /* set up some of the credits. */
4726         init->init.a_rwnd = htonl(max(inp->sctp_socket ? SCTP_SB_LIMIT_RCV(inp->sctp_socket) : 0,
4727             SCTP_MINIMAL_RWND));
4728         init->init.num_outbound_streams = htons(stcb->asoc.pre_open_streams);
4729         init->init.num_inbound_streams = htons(stcb->asoc.max_inbound_streams);
4730         init->init.initial_tsn = htonl(stcb->asoc.init_seq_number);
4731
4732         /* Adaptation layer indication parameter */
4733         if (inp->sctp_ep.adaptation_layer_indicator_provided) {
4734                 parameter_len = (uint16_t)sizeof(struct sctp_adaptation_layer_indication);
4735                 ali = (struct sctp_adaptation_layer_indication *)(mtod(m, caddr_t)+chunk_len);
4736                 ali->ph.param_type = htons(SCTP_ULP_ADAPTATION);
4737                 ali->ph.param_length = htons(parameter_len);
4738                 ali->indication = htonl(inp->sctp_ep.adaptation_layer_indicator);
4739                 chunk_len += parameter_len;
4740         }
4741         /* ECN parameter */
4742         if (stcb->asoc.ecn_supported == 1) {
4743                 parameter_len = (uint16_t)sizeof(struct sctp_paramhdr);
4744                 ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
4745                 ph->param_type = htons(SCTP_ECN_CAPABLE);
4746                 ph->param_length = htons(parameter_len);
4747                 chunk_len += parameter_len;
4748         }
4749         /* PR-SCTP supported parameter */
4750         if (stcb->asoc.prsctp_supported == 1) {
4751                 parameter_len = (uint16_t)sizeof(struct sctp_paramhdr);
4752                 ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
4753                 ph->param_type = htons(SCTP_PRSCTP_SUPPORTED);
4754                 ph->param_length = htons(parameter_len);
4755                 chunk_len += parameter_len;
4756         }
4757         /* Add NAT friendly parameter. */
4758         if (SCTP_BASE_SYSCTL(sctp_inits_include_nat_friendly)) {
4759                 parameter_len = (uint16_t)sizeof(struct sctp_paramhdr);
4760                 ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
4761                 ph->param_type = htons(SCTP_HAS_NAT_SUPPORT);
4762                 ph->param_length = htons(parameter_len);
4763                 chunk_len += parameter_len;
4764         }
4765         /* And now tell the peer which extensions we support */
4766         num_ext = 0;
4767         pr_supported = (struct sctp_supported_chunk_types_param *)(mtod(m, caddr_t)+chunk_len);
4768         if (stcb->asoc.prsctp_supported == 1) {
4769                 pr_supported->chunk_types[num_ext++] = SCTP_FORWARD_CUM_TSN;
4770                 if (stcb->asoc.idata_supported) {
4771                         pr_supported->chunk_types[num_ext++] = SCTP_IFORWARD_CUM_TSN;
4772                 }
4773         }
4774         if (stcb->asoc.auth_supported == 1) {
4775                 pr_supported->chunk_types[num_ext++] = SCTP_AUTHENTICATION;
4776         }
4777         if (stcb->asoc.asconf_supported == 1) {
4778                 pr_supported->chunk_types[num_ext++] = SCTP_ASCONF;
4779                 pr_supported->chunk_types[num_ext++] = SCTP_ASCONF_ACK;
4780         }
4781         if (stcb->asoc.reconfig_supported == 1) {
4782                 pr_supported->chunk_types[num_ext++] = SCTP_STREAM_RESET;
4783         }
4784         if (stcb->asoc.idata_supported) {
4785                 pr_supported->chunk_types[num_ext++] = SCTP_IDATA;
4786         }
4787         if (stcb->asoc.nrsack_supported == 1) {
4788                 pr_supported->chunk_types[num_ext++] = SCTP_NR_SELECTIVE_ACK;
4789         }
4790         if (stcb->asoc.pktdrop_supported == 1) {
4791                 pr_supported->chunk_types[num_ext++] = SCTP_PACKET_DROPPED;
4792         }
4793         if (num_ext > 0) {
4794                 parameter_len = (uint16_t)sizeof(struct sctp_supported_chunk_types_param) + num_ext;
4795                 pr_supported->ph.param_type = htons(SCTP_SUPPORTED_CHUNK_EXT);
4796                 pr_supported->ph.param_length = htons(parameter_len);
4797                 padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
4798                 chunk_len += parameter_len;
4799         }
4800         /* add authentication parameters */
4801         if (stcb->asoc.auth_supported) {
4802                 /* attach RANDOM parameter, if available */
4803                 if (stcb->asoc.authinfo.random != NULL) {
4804                         struct sctp_auth_random *randp;
4805
4806                         if (padding_len > 0) {
4807                                 memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
4808                                 chunk_len += padding_len;
4809                                 padding_len = 0;
4810                         }
4811                         randp = (struct sctp_auth_random *)(mtod(m, caddr_t)+chunk_len);
4812                         parameter_len = (uint16_t)sizeof(struct sctp_auth_random) + stcb->asoc.authinfo.random_len;
4813                         /* random key already contains the header */
4814                         memcpy(randp, stcb->asoc.authinfo.random->key, parameter_len);
4815                         padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
4816                         chunk_len += parameter_len;
4817                 }
4818                 /* add HMAC_ALGO parameter */
4819                 if (stcb->asoc.local_hmacs != NULL) {
4820                         struct sctp_auth_hmac_algo *hmacs;
4821
4822                         if (padding_len > 0) {
4823                                 memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
4824                                 chunk_len += padding_len;
4825                                 padding_len = 0;
4826                         }
4827                         hmacs = (struct sctp_auth_hmac_algo *)(mtod(m, caddr_t)+chunk_len);
4828                         parameter_len = (uint16_t)(sizeof(struct sctp_auth_hmac_algo) +
4829                             stcb->asoc.local_hmacs->num_algo * sizeof(uint16_t));
4830                         hmacs->ph.param_type = htons(SCTP_HMAC_LIST);
4831                         hmacs->ph.param_length = htons(parameter_len);
4832                         sctp_serialize_hmaclist(stcb->asoc.local_hmacs, (uint8_t *)hmacs->hmac_ids);
4833                         padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
4834                         chunk_len += parameter_len;
4835                 }
4836                 /* add CHUNKS parameter */
4837                 if (stcb->asoc.local_auth_chunks != NULL) {
4838                         struct sctp_auth_chunk_list *chunks;
4839
4840                         if (padding_len > 0) {
4841                                 memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
4842                                 chunk_len += padding_len;
4843                                 padding_len = 0;
4844                         }
4845                         chunks = (struct sctp_auth_chunk_list *)(mtod(m, caddr_t)+chunk_len);
4846                         parameter_len = (uint16_t)(sizeof(struct sctp_auth_chunk_list) +
4847                             sctp_auth_get_chklist_size(stcb->asoc.local_auth_chunks));
4848                         chunks->ph.param_type = htons(SCTP_CHUNK_LIST);
4849                         chunks->ph.param_length = htons(parameter_len);
4850                         sctp_serialize_auth_chunks(stcb->asoc.local_auth_chunks, chunks->chunk_types);
4851                         padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
4852                         chunk_len += parameter_len;
4853                 }
4854         }
4855         /* now any cookie time extensions */
4856         if (stcb->asoc.cookie_preserve_req) {
4857                 struct sctp_cookie_perserve_param *cookie_preserve;
4858
4859                 if (padding_len > 0) {
4860                         memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
4861                         chunk_len += padding_len;
4862                         padding_len = 0;
4863                 }
4864                 parameter_len = (uint16_t)sizeof(struct sctp_cookie_perserve_param);
4865                 cookie_preserve = (struct sctp_cookie_perserve_param *)(mtod(m, caddr_t)+chunk_len);
4866                 cookie_preserve->ph.param_type = htons(SCTP_COOKIE_PRESERVE);
4867                 cookie_preserve->ph.param_length = htons(parameter_len);
4868                 cookie_preserve->time = htonl(stcb->asoc.cookie_preserve_req);
4869                 stcb->asoc.cookie_preserve_req = 0;
4870                 chunk_len += parameter_len;
4871         }
4872         if (stcb->asoc.scope.ipv4_addr_legal || stcb->asoc.scope.ipv6_addr_legal) {
4873                 uint8_t i;
4874
4875                 if (padding_len > 0) {
4876                         memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
4877                         chunk_len += padding_len;
4878                         padding_len = 0;
4879                 }
4880                 parameter_len = (uint16_t)sizeof(struct sctp_paramhdr);
4881                 if (stcb->asoc.scope.ipv4_addr_legal) {
4882                         parameter_len += (uint16_t)sizeof(uint16_t);
4883                 }
4884                 if (stcb->asoc.scope.ipv6_addr_legal) {
4885                         parameter_len += (uint16_t)sizeof(uint16_t);
4886                 }
4887                 sup_addr = (struct sctp_supported_addr_param *)(mtod(m, caddr_t)+chunk_len);
4888                 sup_addr->ph.param_type = htons(SCTP_SUPPORTED_ADDRTYPE);
4889                 sup_addr->ph.param_length = htons(parameter_len);
4890                 i = 0;
4891                 if (stcb->asoc.scope.ipv4_addr_legal) {
4892                         sup_addr->addr_type[i++] = htons(SCTP_IPV4_ADDRESS);
4893                 }
4894                 if (stcb->asoc.scope.ipv6_addr_legal) {
4895                         sup_addr->addr_type[i++] = htons(SCTP_IPV6_ADDRESS);
4896                 }
4897                 padding_len = 4 - 2 * i;
4898                 chunk_len += parameter_len;
4899         }
4900         SCTP_BUF_LEN(m) = chunk_len;
4901         /* now the addresses */
4902         /*
4903          * To optimize this we could put the scoping stuff into a structure
4904          * and remove the individual uint8's from the assoc structure. Then
4905          * we could just sifa in the address within the stcb. But for now
4906          * this is a quick hack to get the address stuff teased apart.
4907          */
4908         m_last = sctp_add_addresses_to_i_ia(inp, stcb, &stcb->asoc.scope,
4909             m, cnt_inits_to,
4910             &padding_len, &chunk_len);
4911
4912         init->ch.chunk_length = htons(chunk_len);
4913         if (padding_len > 0) {
4914                 if (sctp_add_pad_tombuf(m_last, padding_len) == NULL) {
4915                         sctp_m_freem(m);
4916                         return;
4917                 }
4918         }
4919         SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT - calls lowlevel_output\n");
4920         if ((error = sctp_lowlevel_chunk_output(inp, stcb, net,
4921             (struct sockaddr *)&net->ro._l_addr,
4922             m, 0, NULL, 0, 0, 0, 0,
4923             inp->sctp_lport, stcb->rport, htonl(0),
4924             net->port, NULL,
4925             0, 0,
4926             so_locked))) {
4927                 SCTPDBG(SCTP_DEBUG_OUTPUT4, "Gak send error %d\n", error);
4928                 if (error == ENOBUFS) {
4929                         stcb->asoc.ifp_had_enobuf = 1;
4930                         SCTP_STAT_INCR(sctps_lowlevelerr);
4931                 }
4932         } else {
4933                 stcb->asoc.ifp_had_enobuf = 0;
4934         }
4935         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
4936         (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
4937 }
4938
4939 struct mbuf *
4940 sctp_arethere_unrecognized_parameters(struct mbuf *in_initpkt,
4941     int param_offset, int *abort_processing, struct sctp_chunkhdr *cp, int *nat_friendly)
4942 {
4943         /*
4944          * Given a mbuf containing an INIT or INIT-ACK with the param_offset
4945          * being equal to the beginning of the params i.e. (iphlen +
4946          * sizeof(struct sctp_init_msg) parse through the parameters to the
4947          * end of the mbuf verifying that all parameters are known.
4948          *
4949          * For unknown parameters build and return a mbuf with
4950          * UNRECOGNIZED_PARAMETER errors. If the flags indicate to stop
4951          * processing this chunk stop, and set *abort_processing to 1.
4952          *
4953          * By having param_offset be pre-set to where parameters begin it is
4954          * hoped that this routine may be reused in the future by new
4955          * features.
4956          */
4957         struct sctp_paramhdr *phdr, params;
4958
4959         struct mbuf *mat, *op_err;
4960         char tempbuf[SCTP_PARAM_BUFFER_SIZE];
4961         int at, limit, pad_needed;
4962         uint16_t ptype, plen, padded_size;
4963         int err_at;
4964
4965         *abort_processing = 0;
4966         mat = in_initpkt;
4967         err_at = 0;
4968         limit = ntohs(cp->chunk_length) - sizeof(struct sctp_init_chunk);
4969         at = param_offset;
4970         op_err = NULL;
4971         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Check for unrecognized param's\n");
4972         phdr = sctp_get_next_param(mat, at, &params, sizeof(params));
4973         while ((phdr != NULL) && ((size_t)limit >= sizeof(struct sctp_paramhdr))) {
4974                 ptype = ntohs(phdr->param_type);
4975                 plen = ntohs(phdr->param_length);
4976                 if ((plen > limit) || (plen < sizeof(struct sctp_paramhdr))) {
4977                         /* wacked parameter */
4978                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error %d\n", plen);
4979                         goto invalid_size;
4980                 }
4981                 limit -= SCTP_SIZE32(plen);
4982                 /*-
4983                  * All parameters for all chunks that we know/understand are
4984                  * listed here. We process them other places and make
4985                  * appropriate stop actions per the upper bits. However this
4986                  * is the generic routine processor's can call to get back
4987                  * an operr.. to either incorporate (init-ack) or send.
4988                  */
4989                 padded_size = SCTP_SIZE32(plen);
4990                 switch (ptype) {
4991                         /* Param's with variable size */
4992                 case SCTP_HEARTBEAT_INFO:
4993                 case SCTP_STATE_COOKIE:
4994                 case SCTP_UNRECOG_PARAM:
4995                 case SCTP_ERROR_CAUSE_IND:
4996                         /* ok skip fwd */
4997                         at += padded_size;
4998                         break;
4999                         /* Param's with variable size within a range */
5000                 case SCTP_CHUNK_LIST:
5001                 case SCTP_SUPPORTED_CHUNK_EXT:
5002                         if (padded_size > (sizeof(struct sctp_supported_chunk_types_param) + (sizeof(uint8_t) * SCTP_MAX_SUPPORTED_EXT))) {
5003                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error chklist %d\n", plen);
5004                                 goto invalid_size;
5005                         }
5006                         at += padded_size;
5007                         break;
5008                 case SCTP_SUPPORTED_ADDRTYPE:
5009                         if (padded_size > SCTP_MAX_ADDR_PARAMS_SIZE) {
5010                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error supaddrtype %d\n", plen);
5011                                 goto invalid_size;
5012                         }
5013                         at += padded_size;
5014                         break;
5015                 case SCTP_RANDOM:
5016                         if (padded_size > (sizeof(struct sctp_auth_random) + SCTP_RANDOM_MAX_SIZE)) {
5017                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error random %d\n", plen);
5018                                 goto invalid_size;
5019                         }
5020                         at += padded_size;
5021                         break;
5022                 case SCTP_SET_PRIM_ADDR:
5023                 case SCTP_DEL_IP_ADDRESS:
5024                 case SCTP_ADD_IP_ADDRESS:
5025                         if ((padded_size != sizeof(struct sctp_asconf_addrv4_param)) &&
5026                             (padded_size != sizeof(struct sctp_asconf_addr_param))) {
5027                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error setprim %d\n", plen);
5028                                 goto invalid_size;
5029                         }
5030                         at += padded_size;
5031                         break;
5032                         /* Param's with a fixed size */
5033                 case SCTP_IPV4_ADDRESS:
5034                         if (padded_size != sizeof(struct sctp_ipv4addr_param)) {
5035                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error ipv4 addr %d\n", plen);
5036                                 goto invalid_size;
5037                         }
5038                         at += padded_size;
5039                         break;
5040                 case SCTP_IPV6_ADDRESS:
5041                         if (padded_size != sizeof(struct sctp_ipv6addr_param)) {
5042                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error ipv6 addr %d\n", plen);
5043                                 goto invalid_size;
5044                         }
5045                         at += padded_size;
5046                         break;
5047                 case SCTP_COOKIE_PRESERVE:
5048                         if (padded_size != sizeof(struct sctp_cookie_perserve_param)) {
5049                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error cookie-preserve %d\n", plen);
5050                                 goto invalid_size;
5051                         }
5052                         at += padded_size;
5053                         break;
5054                 case SCTP_HAS_NAT_SUPPORT:
5055                         *nat_friendly = 1;
5056                         /* fall through */
5057                 case SCTP_PRSCTP_SUPPORTED:
5058                         if (padded_size != sizeof(struct sctp_paramhdr)) {
5059                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error prsctp/nat support %d\n", plen);
5060                                 goto invalid_size;
5061                         }
5062                         at += padded_size;
5063                         break;
5064                 case SCTP_ECN_CAPABLE:
5065                         if (padded_size != sizeof(struct sctp_paramhdr)) {
5066                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error ecn %d\n", plen);
5067                                 goto invalid_size;
5068                         }
5069                         at += padded_size;
5070                         break;
5071                 case SCTP_ULP_ADAPTATION:
5072                         if (padded_size != sizeof(struct sctp_adaptation_layer_indication)) {
5073                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error adapatation %d\n", plen);
5074                                 goto invalid_size;
5075                         }
5076                         at += padded_size;
5077                         break;
5078                 case SCTP_SUCCESS_REPORT:
5079                         if (padded_size != sizeof(struct sctp_asconf_paramhdr)) {
5080                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error success %d\n", plen);
5081                                 goto invalid_size;
5082                         }
5083                         at += padded_size;
5084                         break;
5085                 case SCTP_HOSTNAME_ADDRESS:
5086                         {
5087                                 /* We can NOT handle HOST NAME addresses!! */
5088                                 int l_len;
5089
5090                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Can't handle hostname addresses.. abort processing\n");
5091                                 *abort_processing = 1;
5092                                 if (op_err == NULL) {
5093                                         /* Ok need to try to get a mbuf */
5094 #ifdef INET6
5095                                         l_len = SCTP_MIN_OVERHEAD;
5096 #else
5097                                         l_len = SCTP_MIN_V4_OVERHEAD;
5098 #endif
5099                                         l_len += sizeof(struct sctp_chunkhdr);
5100                                         l_len += plen;
5101                                         l_len += sizeof(struct sctp_paramhdr);
5102                                         op_err = sctp_get_mbuf_for_msg(l_len, 0, M_NOWAIT, 1, MT_DATA);
5103                                         if (op_err) {
5104                                                 SCTP_BUF_LEN(op_err) = 0;
5105                                                 /*
5106                                                  * pre-reserve space for ip
5107                                                  * and sctp header  and
5108                                                  * chunk hdr
5109                                                  */
5110 #ifdef INET6
5111                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip6_hdr));
5112 #else
5113                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip));
5114 #endif
5115                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctphdr));
5116                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctp_chunkhdr));
5117                                         }
5118                                 }
5119                                 if (op_err) {
5120                                         /* If we have space */
5121                                         struct sctp_paramhdr s;
5122
5123                                         if (err_at % 4) {
5124                                                 uint32_t cpthis = 0;
5125
5126                                                 pad_needed = 4 - (err_at % 4);
5127                                                 m_copyback(op_err, err_at, pad_needed, (caddr_t)&cpthis);
5128                                                 err_at += pad_needed;
5129                                         }
5130                                         s.param_type = htons(SCTP_CAUSE_UNRESOLVABLE_ADDR);
5131                                         s.param_length = htons(sizeof(s) + plen);
5132                                         m_copyback(op_err, err_at, sizeof(s), (caddr_t)&s);
5133                                         err_at += sizeof(s);
5134                                         if (plen > sizeof(tempbuf)) {
5135                                                 plen = sizeof(tempbuf);
5136                                         }
5137                                         phdr = sctp_get_next_param(mat, at, (struct sctp_paramhdr *)tempbuf, plen);
5138                                         if (phdr == NULL) {
5139                                                 sctp_m_freem(op_err);
5140                                                 /*
5141                                                  * we are out of memory but
5142                                                  * we still need to have a
5143                                                  * look at what to do (the
5144                                                  * system is in trouble
5145                                                  * though).
5146                                                  */
5147                                                 return (NULL);
5148                                         }
5149                                         m_copyback(op_err, err_at, plen, (caddr_t)phdr);
5150                                 }
5151                                 return (op_err);
5152                                 break;
5153                         }
5154                 default:
5155                         /*
5156                          * we do not recognize the parameter figure out what
5157                          * we do.
5158                          */
5159                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Hit default param %x\n", ptype);
5160                         if ((ptype & 0x4000) == 0x4000) {
5161                                 /* Report bit is set?? */
5162                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "report op err\n");
5163                                 if (op_err == NULL) {
5164                                         int l_len;
5165
5166                                         /* Ok need to try to get an mbuf */
5167 #ifdef INET6
5168                                         l_len = SCTP_MIN_OVERHEAD;
5169 #else
5170                                         l_len = SCTP_MIN_V4_OVERHEAD;
5171 #endif
5172                                         l_len += sizeof(struct sctp_chunkhdr);
5173                                         l_len += plen;
5174                                         l_len += sizeof(struct sctp_paramhdr);
5175                                         op_err = sctp_get_mbuf_for_msg(l_len, 0, M_NOWAIT, 1, MT_DATA);
5176                                         if (op_err) {
5177                                                 SCTP_BUF_LEN(op_err) = 0;
5178 #ifdef INET6
5179                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip6_hdr));
5180 #else
5181                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip));
5182 #endif
5183                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctphdr));
5184                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctp_chunkhdr));
5185                                         }
5186                                 }
5187                                 if (op_err) {
5188                                         /* If we have space */
5189                                         struct sctp_paramhdr s;
5190
5191                                         if (err_at % 4) {
5192                                                 uint32_t cpthis = 0;
5193
5194                                                 pad_needed = 4 - (err_at % 4);
5195                                                 m_copyback(op_err, err_at, pad_needed, (caddr_t)&cpthis);
5196                                                 err_at += pad_needed;
5197                                         }
5198                                         s.param_type = htons(SCTP_UNRECOG_PARAM);
5199                                         s.param_length = htons(sizeof(s) + plen);
5200                                         m_copyback(op_err, err_at, sizeof(s), (caddr_t)&s);
5201                                         err_at += sizeof(s);
5202                                         if (plen > sizeof(tempbuf)) {
5203                                                 plen = sizeof(tempbuf);
5204                                         }
5205                                         phdr = sctp_get_next_param(mat, at, (struct sctp_paramhdr *)tempbuf, plen);
5206                                         if (phdr == NULL) {
5207                                                 sctp_m_freem(op_err);
5208                                                 /*
5209                                                  * we are out of memory but
5210                                                  * we still need to have a
5211                                                  * look at what to do (the
5212                                                  * system is in trouble
5213                                                  * though).
5214                                                  */
5215                                                 op_err = NULL;
5216                                                 goto more_processing;
5217                                         }
5218                                         m_copyback(op_err, err_at, plen, (caddr_t)phdr);
5219                                         err_at += plen;
5220                                 }
5221                         }
5222         more_processing:
5223                         if ((ptype & 0x8000) == 0x0000) {
5224                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "stop proc\n");
5225                                 return (op_err);
5226                         } else {
5227                                 /* skip this chunk and continue processing */
5228                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "move on\n");
5229                                 at += SCTP_SIZE32(plen);
5230                         }
5231                         break;
5232
5233                 }
5234                 phdr = sctp_get_next_param(mat, at, &params, sizeof(params));
5235         }
5236         return (op_err);
5237 invalid_size:
5238         SCTPDBG(SCTP_DEBUG_OUTPUT1, "abort flag set\n");
5239         *abort_processing = 1;
5240         if ((op_err == NULL) && phdr) {
5241                 int l_len;
5242 #ifdef INET6
5243                 l_len = SCTP_MIN_OVERHEAD;
5244 #else
5245                 l_len = SCTP_MIN_V4_OVERHEAD;
5246 #endif
5247                 l_len += sizeof(struct sctp_chunkhdr);
5248                 l_len += (2 * sizeof(struct sctp_paramhdr));
5249                 op_err = sctp_get_mbuf_for_msg(l_len, 0, M_NOWAIT, 1, MT_DATA);
5250                 if (op_err) {
5251                         SCTP_BUF_LEN(op_err) = 0;
5252 #ifdef INET6
5253                         SCTP_BUF_RESV_UF(op_err, sizeof(struct ip6_hdr));
5254 #else
5255                         SCTP_BUF_RESV_UF(op_err, sizeof(struct ip));
5256 #endif
5257                         SCTP_BUF_RESV_UF(op_err, sizeof(struct sctphdr));
5258                         SCTP_BUF_RESV_UF(op_err, sizeof(struct sctp_chunkhdr));
5259                 }
5260         }
5261         if ((op_err) && phdr) {
5262                 struct sctp_paramhdr s;
5263
5264                 if (err_at % 4) {
5265                         uint32_t cpthis = 0;
5266
5267                         pad_needed = 4 - (err_at % 4);
5268                         m_copyback(op_err, err_at, pad_needed, (caddr_t)&cpthis);
5269                         err_at += pad_needed;
5270                 }
5271                 s.param_type = htons(SCTP_CAUSE_PROTOCOL_VIOLATION);
5272                 s.param_length = htons(sizeof(s) + sizeof(struct sctp_paramhdr));
5273                 m_copyback(op_err, err_at, sizeof(s), (caddr_t)&s);
5274                 err_at += sizeof(s);
5275                 /* Only copy back the p-hdr that caused the issue */
5276                 m_copyback(op_err, err_at, sizeof(struct sctp_paramhdr), (caddr_t)phdr);
5277         }
5278         return (op_err);
5279 }
5280
5281 static int
5282 sctp_are_there_new_addresses(struct sctp_association *asoc,
5283     struct mbuf *in_initpkt, int offset, struct sockaddr *src)
5284 {
5285         /*
5286          * Given a INIT packet, look through the packet to verify that there
5287          * are NO new addresses. As we go through the parameters add reports
5288          * of any un-understood parameters that require an error.  Also we
5289          * must return (1) to drop the packet if we see a un-understood
5290          * parameter that tells us to drop the chunk.
5291          */
5292         struct sockaddr *sa_touse;
5293         struct sockaddr *sa;
5294         struct sctp_paramhdr *phdr, params;
5295         uint16_t ptype, plen;
5296         uint8_t fnd;
5297         struct sctp_nets *net;
5298         int check_src;
5299 #ifdef INET
5300         struct sockaddr_in sin4, *sa4;
5301 #endif
5302 #ifdef INET6
5303         struct sockaddr_in6 sin6, *sa6;
5304 #endif
5305
5306 #ifdef INET
5307         memset(&sin4, 0, sizeof(sin4));
5308         sin4.sin_family = AF_INET;
5309         sin4.sin_len = sizeof(sin4);
5310 #endif
5311 #ifdef INET6
5312         memset(&sin6, 0, sizeof(sin6));
5313         sin6.sin6_family = AF_INET6;
5314         sin6.sin6_len = sizeof(sin6);
5315 #endif
5316         /* First what about the src address of the pkt ? */
5317         check_src = 0;
5318         switch (src->sa_family) {
5319 #ifdef INET
5320         case AF_INET:
5321                 if (asoc->scope.ipv4_addr_legal) {
5322                         check_src = 1;
5323                 }
5324                 break;
5325 #endif
5326 #ifdef INET6
5327         case AF_INET6:
5328                 if (asoc->scope.ipv6_addr_legal) {
5329                         check_src = 1;
5330                 }
5331                 break;
5332 #endif
5333         default:
5334                 /* TSNH */
5335                 break;
5336         }
5337         if (check_src) {
5338                 fnd = 0;
5339                 TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
5340                         sa = (struct sockaddr *)&net->ro._l_addr;
5341                         if (sa->sa_family == src->sa_family) {
5342 #ifdef INET
5343                                 if (sa->sa_family == AF_INET) {
5344                                         struct sockaddr_in *src4;
5345
5346                                         sa4 = (struct sockaddr_in *)sa;
5347                                         src4 = (struct sockaddr_in *)src;
5348                                         if (sa4->sin_addr.s_addr == src4->sin_addr.s_addr) {
5349                                                 fnd = 1;
5350                                                 break;
5351                                         }
5352                                 }
5353 #endif
5354 #ifdef INET6
5355                                 if (sa->sa_family == AF_INET6) {
5356                                         struct sockaddr_in6 *src6;
5357
5358                                         sa6 = (struct sockaddr_in6 *)sa;
5359                                         src6 = (struct sockaddr_in6 *)src;
5360                                         if (SCTP6_ARE_ADDR_EQUAL(sa6, src6)) {
5361                                                 fnd = 1;
5362                                                 break;
5363                                         }
5364                                 }
5365 #endif
5366                         }
5367                 }
5368                 if (fnd == 0) {
5369                         /* New address added! no need to look further. */
5370                         return (1);
5371                 }
5372         }
5373         /* Ok so far lets munge through the rest of the packet */
5374         offset += sizeof(struct sctp_init_chunk);
5375         phdr = sctp_get_next_param(in_initpkt, offset, &params, sizeof(params));
5376         while (phdr) {
5377                 sa_touse = NULL;
5378                 ptype = ntohs(phdr->param_type);
5379                 plen = ntohs(phdr->param_length);
5380                 switch (ptype) {
5381 #ifdef INET
5382                 case SCTP_IPV4_ADDRESS:
5383                         {
5384                                 struct sctp_ipv4addr_param *p4, p4_buf;
5385
5386                                 if (plen != sizeof(struct sctp_ipv4addr_param)) {
5387                                         return (1);
5388                                 }
5389                                 phdr = sctp_get_next_param(in_initpkt, offset,
5390                                     (struct sctp_paramhdr *)&p4_buf, sizeof(p4_buf));
5391                                 if (phdr == NULL) {
5392                                         return (1);
5393                                 }
5394                                 if (asoc->scope.ipv4_addr_legal) {
5395                                         p4 = (struct sctp_ipv4addr_param *)phdr;
5396                                         sin4.sin_addr.s_addr = p4->addr;
5397                                         sa_touse = (struct sockaddr *)&sin4;
5398                                 }
5399                                 break;
5400                         }
5401 #endif
5402 #ifdef INET6
5403                 case SCTP_IPV6_ADDRESS:
5404                         {
5405                                 struct sctp_ipv6addr_param *p6, p6_buf;
5406
5407                                 if (plen != sizeof(struct sctp_ipv6addr_param)) {
5408                                         return (1);
5409                                 }
5410                                 phdr = sctp_get_next_param(in_initpkt, offset,
5411                                     (struct sctp_paramhdr *)&p6_buf, sizeof(p6_buf));
5412                                 if (phdr == NULL) {
5413                                         return (1);
5414                                 }
5415                                 if (asoc->scope.ipv6_addr_legal) {
5416                                         p6 = (struct sctp_ipv6addr_param *)phdr;
5417                                         memcpy((caddr_t)&sin6.sin6_addr, p6->addr,
5418                                             sizeof(p6->addr));
5419                                         sa_touse = (struct sockaddr *)&sin6;
5420                                 }
5421                                 break;
5422                         }
5423 #endif
5424                 default:
5425                         sa_touse = NULL;
5426                         break;
5427                 }
5428                 if (sa_touse) {
5429                         /* ok, sa_touse points to one to check */
5430                         fnd = 0;
5431                         TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
5432                                 sa = (struct sockaddr *)&net->ro._l_addr;
5433                                 if (sa->sa_family != sa_touse->sa_family) {
5434                                         continue;
5435                                 }
5436 #ifdef INET
5437                                 if (sa->sa_family == AF_INET) {
5438                                         sa4 = (struct sockaddr_in *)sa;
5439                                         if (sa4->sin_addr.s_addr ==
5440                                             sin4.sin_addr.s_addr) {
5441                                                 fnd = 1;
5442                                                 break;
5443                                         }
5444                                 }
5445 #endif
5446 #ifdef INET6
5447                                 if (sa->sa_family == AF_INET6) {
5448                                         sa6 = (struct sockaddr_in6 *)sa;
5449                                         if (SCTP6_ARE_ADDR_EQUAL(
5450                                             sa6, &sin6)) {
5451                                                 fnd = 1;
5452                                                 break;
5453                                         }
5454                                 }
5455 #endif
5456                         }
5457                         if (!fnd) {
5458                                 /* New addr added! no need to look further */
5459                                 return (1);
5460                         }
5461                 }
5462                 offset += SCTP_SIZE32(plen);
5463                 phdr = sctp_get_next_param(in_initpkt, offset, &params, sizeof(params));
5464         }
5465         return (0);
5466 }
5467
5468 /*
5469  * Given a MBUF chain that was sent into us containing an INIT. Build a
5470  * INIT-ACK with COOKIE and send back. We assume that the in_initpkt has done
5471  * a pullup to include IPv6/4header, SCTP header and initial part of INIT
5472  * message (i.e. the struct sctp_init_msg).
5473  */
5474 void
5475 sctp_send_initiate_ack(struct sctp_inpcb *inp, struct sctp_tcb *stcb,
5476     struct sctp_nets *src_net, struct mbuf *init_pkt,
5477     int iphlen, int offset,
5478     struct sockaddr *src, struct sockaddr *dst,
5479     struct sctphdr *sh, struct sctp_init_chunk *init_chk,
5480     uint8_t mflowtype, uint32_t mflowid,
5481     uint32_t vrf_id, uint16_t port)
5482 {
5483         struct sctp_association *asoc;
5484         struct mbuf *m, *m_tmp, *m_last, *m_cookie, *op_err;
5485         struct sctp_init_ack_chunk *initack;
5486         struct sctp_adaptation_layer_indication *ali;
5487         struct sctp_supported_chunk_types_param *pr_supported;
5488         struct sctp_paramhdr *ph;
5489         union sctp_sockstore *over_addr;
5490         struct sctp_scoping scp;
5491         struct timeval now;
5492 #ifdef INET
5493         struct sockaddr_in *dst4 = (struct sockaddr_in *)dst;
5494         struct sockaddr_in *src4 = (struct sockaddr_in *)src;
5495         struct sockaddr_in *sin;
5496 #endif
5497 #ifdef INET6
5498         struct sockaddr_in6 *dst6 = (struct sockaddr_in6 *)dst;
5499         struct sockaddr_in6 *src6 = (struct sockaddr_in6 *)src;
5500         struct sockaddr_in6 *sin6;
5501 #endif
5502         struct sockaddr *to;
5503         struct sctp_state_cookie stc;
5504         struct sctp_nets *net = NULL;
5505         uint8_t *signature = NULL;
5506         int cnt_inits_to = 0;
5507         uint16_t his_limit, i_want;
5508         int abort_flag;
5509         int nat_friendly = 0;
5510         int error;
5511         struct socket *so;
5512         uint16_t num_ext, chunk_len, padding_len, parameter_len;
5513
5514         if (stcb) {
5515                 asoc = &stcb->asoc;
5516         } else {
5517                 asoc = NULL;
5518         }
5519         if ((asoc != NULL) &&
5520             (SCTP_GET_STATE(asoc) != SCTP_STATE_COOKIE_WAIT)) {
5521                 if (sctp_are_there_new_addresses(asoc, init_pkt, offset, src)) {
5522                         /*
5523                          * new addresses, out of here in non-cookie-wait
5524                          * states
5525                          *
5526                          * Send an ABORT, without the new address error
5527                          * cause. This looks no different than if no
5528                          * listener was present.
5529                          */
5530                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
5531                             "Address added");
5532                         sctp_send_abort(init_pkt, iphlen, src, dst, sh, 0, op_err,
5533                             mflowtype, mflowid, inp->fibnum,
5534                             vrf_id, port);
5535                         return;
5536                 }
5537                 if (src_net != NULL && (src_net->port != port)) {
5538                         /*
5539                          * change of remote encapsulation port, out of here
5540                          * in non-cookie-wait states
5541                          *
5542                          * Send an ABORT, without an specific error cause.
5543                          * This looks no different than if no listener was
5544                          * present.
5545                          */
5546                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
5547                             "Remote encapsulation port changed");
5548                         sctp_send_abort(init_pkt, iphlen, src, dst, sh, 0, op_err,
5549                             mflowtype, mflowid, inp->fibnum,
5550                             vrf_id, port);
5551                         return;
5552                 }
5553         }
5554         abort_flag = 0;
5555         op_err = sctp_arethere_unrecognized_parameters(init_pkt,
5556             (offset + sizeof(struct sctp_init_chunk)),
5557             &abort_flag, (struct sctp_chunkhdr *)init_chk, &nat_friendly);
5558         if (abort_flag) {
5559 do_a_abort:
5560                 if (op_err == NULL) {
5561                         char msg[SCTP_DIAG_INFO_LEN];
5562
5563                         snprintf(msg, sizeof(msg), "%s:%d at %s", __FILE__, __LINE__, __func__);
5564                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
5565                             msg);
5566                 }
5567                 sctp_send_abort(init_pkt, iphlen, src, dst, sh,
5568                     init_chk->init.initiate_tag, op_err,
5569                     mflowtype, mflowid, inp->fibnum,
5570                     vrf_id, port);
5571                 return;
5572         }
5573         m = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
5574         if (m == NULL) {
5575                 /* No memory, INIT timer will re-attempt. */
5576                 if (op_err)
5577                         sctp_m_freem(op_err);
5578                 return;
5579         }
5580         chunk_len = (uint16_t)sizeof(struct sctp_init_ack_chunk);
5581         padding_len = 0;
5582
5583         /*
5584          * We might not overwrite the identification[] completely and on
5585          * some platforms time_entered will contain some padding. Therefore
5586          * zero out the cookie to avoid putting uninitialized memory on the
5587          * wire.
5588          */
5589         memset(&stc, 0, sizeof(struct sctp_state_cookie));
5590
5591         /* the time I built cookie */
5592         (void)SCTP_GETTIME_TIMEVAL(&now);
5593         stc.time_entered.tv_sec = now.tv_sec;
5594         stc.time_entered.tv_usec = now.tv_usec;
5595
5596         /* populate any tie tags */
5597         if (asoc != NULL) {
5598                 /* unlock before tag selections */
5599                 stc.tie_tag_my_vtag = asoc->my_vtag_nonce;
5600                 stc.tie_tag_peer_vtag = asoc->peer_vtag_nonce;
5601                 stc.cookie_life = asoc->cookie_life;
5602                 net = asoc->primary_destination;
5603         } else {
5604                 stc.tie_tag_my_vtag = 0;
5605                 stc.tie_tag_peer_vtag = 0;
5606                 /* life I will award this cookie */
5607                 stc.cookie_life = inp->sctp_ep.def_cookie_life;
5608         }
5609
5610         /* copy in the ports for later check */
5611         stc.myport = sh->dest_port;
5612         stc.peerport = sh->src_port;
5613
5614         /*
5615          * If we wanted to honor cookie life extensions, we would add to
5616          * stc.cookie_life. For now we should NOT honor any extension
5617          */
5618         stc.site_scope = stc.local_scope = stc.loopback_scope = 0;
5619         if (inp->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
5620                 stc.ipv6_addr_legal = 1;
5621                 if (SCTP_IPV6_V6ONLY(inp)) {
5622                         stc.ipv4_addr_legal = 0;
5623                 } else {
5624                         stc.ipv4_addr_legal = 1;
5625                 }
5626         } else {
5627                 stc.ipv6_addr_legal = 0;
5628                 stc.ipv4_addr_legal = 1;
5629         }
5630         stc.ipv4_scope = 0;
5631         if (net == NULL) {
5632                 to = src;
5633                 switch (dst->sa_family) {
5634 #ifdef INET
5635                 case AF_INET:
5636                         {
5637                                 /* lookup address */
5638                                 stc.address[0] = src4->sin_addr.s_addr;
5639                                 stc.address[1] = 0;
5640                                 stc.address[2] = 0;
5641                                 stc.address[3] = 0;
5642                                 stc.addr_type = SCTP_IPV4_ADDRESS;
5643                                 /* local from address */
5644                                 stc.laddress[0] = dst4->sin_addr.s_addr;
5645                                 stc.laddress[1] = 0;
5646                                 stc.laddress[2] = 0;
5647                                 stc.laddress[3] = 0;
5648                                 stc.laddr_type = SCTP_IPV4_ADDRESS;
5649                                 /* scope_id is only for v6 */
5650                                 stc.scope_id = 0;
5651                                 if ((IN4_ISPRIVATE_ADDRESS(&src4->sin_addr)) ||
5652                                     (IN4_ISPRIVATE_ADDRESS(&dst4->sin_addr))) {
5653                                         stc.ipv4_scope = 1;
5654                                 }
5655                                 /* Must use the address in this case */
5656                                 if (sctp_is_address_on_local_host(src, vrf_id)) {
5657                                         stc.loopback_scope = 1;
5658                                         stc.ipv4_scope = 1;
5659                                         stc.site_scope = 1;
5660                                         stc.local_scope = 0;
5661                                 }
5662                                 break;
5663                         }
5664 #endif
5665 #ifdef INET6
5666                 case AF_INET6:
5667                         {
5668                                 stc.addr_type = SCTP_IPV6_ADDRESS;
5669                                 memcpy(&stc.address, &src6->sin6_addr, sizeof(struct in6_addr));
5670                                 stc.scope_id = ntohs(in6_getscope(&src6->sin6_addr));
5671                                 if (sctp_is_address_on_local_host(src, vrf_id)) {
5672                                         stc.loopback_scope = 1;
5673                                         stc.local_scope = 0;
5674                                         stc.site_scope = 1;
5675                                         stc.ipv4_scope = 1;
5676                                 } else if (IN6_IS_ADDR_LINKLOCAL(&src6->sin6_addr) ||
5677                                     IN6_IS_ADDR_LINKLOCAL(&dst6->sin6_addr)) {
5678                                         /*
5679                                          * If the new destination or source
5680                                          * is a LINK_LOCAL we must have
5681                                          * common both site and local scope.
5682                                          * Don't set local scope though
5683                                          * since we must depend on the
5684                                          * source to be added implicitly. We
5685                                          * cannot assure just because we
5686                                          * share one link that all links are
5687                                          * common.
5688                                          */
5689                                         stc.local_scope = 0;
5690                                         stc.site_scope = 1;
5691                                         stc.ipv4_scope = 1;
5692                                         /*
5693                                          * we start counting for the private
5694                                          * address stuff at 1. since the
5695                                          * link local we source from won't
5696                                          * show up in our scoped count.
5697                                          */
5698                                         cnt_inits_to = 1;
5699                                         /*
5700                                          * pull out the scope_id from
5701                                          * incoming pkt
5702                                          */
5703                                 } else if (IN6_IS_ADDR_SITELOCAL(&src6->sin6_addr) ||
5704                                     IN6_IS_ADDR_SITELOCAL(&dst6->sin6_addr)) {
5705                                         /*
5706                                          * If the new destination or source
5707                                          * is SITE_LOCAL then we must have
5708                                          * site scope in common.
5709                                          */
5710                                         stc.site_scope = 1;
5711                                 }
5712                                 memcpy(&stc.laddress, &dst6->sin6_addr, sizeof(struct in6_addr));
5713                                 stc.laddr_type = SCTP_IPV6_ADDRESS;
5714                                 break;
5715                         }
5716 #endif
5717                 default:
5718                         /* TSNH */
5719                         goto do_a_abort;
5720                         break;
5721                 }
5722         } else {
5723                 /* set the scope per the existing tcb */
5724
5725 #ifdef INET6
5726                 struct sctp_nets *lnet;
5727 #endif
5728
5729                 stc.loopback_scope = asoc->scope.loopback_scope;
5730                 stc.ipv4_scope = asoc->scope.ipv4_local_scope;
5731                 stc.site_scope = asoc->scope.site_scope;
5732                 stc.local_scope = asoc->scope.local_scope;
5733 #ifdef INET6
5734                 /* Why do we not consider IPv4 LL addresses? */
5735                 TAILQ_FOREACH(lnet, &asoc->nets, sctp_next) {
5736                         if (lnet->ro._l_addr.sin6.sin6_family == AF_INET6) {
5737                                 if (IN6_IS_ADDR_LINKLOCAL(&lnet->ro._l_addr.sin6.sin6_addr)) {
5738                                         /*
5739                                          * if we have a LL address, start
5740                                          * counting at 1.
5741                                          */
5742                                         cnt_inits_to = 1;
5743                                 }
5744                         }
5745                 }
5746 #endif
5747                 /* use the net pointer */
5748                 to = (struct sockaddr *)&net->ro._l_addr;
5749                 switch (to->sa_family) {
5750 #ifdef INET
5751                 case AF_INET:
5752                         sin = (struct sockaddr_in *)to;
5753                         stc.address[0] = sin->sin_addr.s_addr;
5754                         stc.address[1] = 0;
5755                         stc.address[2] = 0;
5756                         stc.address[3] = 0;
5757                         stc.addr_type = SCTP_IPV4_ADDRESS;
5758                         if (net->src_addr_selected == 0) {
5759                                 /*
5760                                  * strange case here, the INIT should have
5761                                  * did the selection.
5762                                  */
5763                                 net->ro._s_addr = sctp_source_address_selection(inp,
5764                                     stcb, (sctp_route_t *)&net->ro,
5765                                     net, 0, vrf_id);
5766                                 if (net->ro._s_addr == NULL)
5767                                         return;
5768
5769                                 net->src_addr_selected = 1;
5770
5771                         }
5772                         stc.laddress[0] = net->ro._s_addr->address.sin.sin_addr.s_addr;
5773                         stc.laddress[1] = 0;
5774                         stc.laddress[2] = 0;
5775                         stc.laddress[3] = 0;
5776                         stc.laddr_type = SCTP_IPV4_ADDRESS;
5777                         /* scope_id is only for v6 */
5778                         stc.scope_id = 0;
5779                         break;
5780 #endif
5781 #ifdef INET6
5782                 case AF_INET6:
5783                         sin6 = (struct sockaddr_in6 *)to;
5784                         memcpy(&stc.address, &sin6->sin6_addr,
5785                             sizeof(struct in6_addr));
5786                         stc.addr_type = SCTP_IPV6_ADDRESS;
5787                         stc.scope_id = sin6->sin6_scope_id;
5788                         if (net->src_addr_selected == 0) {
5789                                 /*
5790                                  * strange case here, the INIT should have
5791                                  * done the selection.
5792                                  */
5793                                 net->ro._s_addr = sctp_source_address_selection(inp,
5794                                     stcb, (sctp_route_t *)&net->ro,
5795                                     net, 0, vrf_id);
5796                                 if (net->ro._s_addr == NULL)
5797                                         return;
5798
5799                                 net->src_addr_selected = 1;
5800                         }
5801                         memcpy(&stc.laddress, &net->ro._s_addr->address.sin6.sin6_addr,
5802                             sizeof(struct in6_addr));
5803                         stc.laddr_type = SCTP_IPV6_ADDRESS;
5804                         break;
5805 #endif
5806                 }
5807         }
5808         /* Now lets put the SCTP header in place */
5809         initack = mtod(m, struct sctp_init_ack_chunk *);
5810         /* Save it off for quick ref */
5811         stc.peers_vtag = ntohl(init_chk->init.initiate_tag);
5812         /* who are we */
5813         memcpy(stc.identification, SCTP_VERSION_STRING,
5814             min(strlen(SCTP_VERSION_STRING), sizeof(stc.identification)));
5815         memset(stc.reserved, 0, SCTP_RESERVE_SPACE);
5816         /* now the chunk header */
5817         initack->ch.chunk_type = SCTP_INITIATION_ACK;
5818         initack->ch.chunk_flags = 0;
5819         /* fill in later from mbuf we build */
5820         initack->ch.chunk_length = 0;
5821         /* place in my tag */
5822         if ((asoc != NULL) &&
5823             ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) ||
5824             (SCTP_GET_STATE(asoc) == SCTP_STATE_INUSE) ||
5825             (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED))) {
5826                 /* re-use the v-tags and init-seq here */
5827                 initack->init.initiate_tag = htonl(asoc->my_vtag);
5828                 initack->init.initial_tsn = htonl(asoc->init_seq_number);
5829         } else {
5830                 uint32_t vtag, itsn;
5831
5832                 if (asoc) {
5833                         atomic_add_int(&asoc->refcnt, 1);
5834                         SCTP_TCB_UNLOCK(stcb);
5835         new_tag:
5836                         vtag = sctp_select_a_tag(inp, inp->sctp_lport, sh->src_port, 1);
5837                         if ((asoc->peer_supports_nat) && (vtag == asoc->my_vtag)) {
5838                                 /*
5839                                  * Got a duplicate vtag on some guy behind a
5840                                  * nat make sure we don't use it.
5841                                  */
5842                                 goto new_tag;
5843                         }
5844                         initack->init.initiate_tag = htonl(vtag);
5845                         /* get a TSN to use too */
5846                         itsn = sctp_select_initial_TSN(&inp->sctp_ep);
5847                         initack->init.initial_tsn = htonl(itsn);
5848                         SCTP_TCB_LOCK(stcb);
5849                         atomic_add_int(&asoc->refcnt, -1);
5850                 } else {
5851                         SCTP_INP_INCR_REF(inp);
5852                         SCTP_INP_RUNLOCK(inp);
5853                         vtag = sctp_select_a_tag(inp, inp->sctp_lport, sh->src_port, 1);
5854                         initack->init.initiate_tag = htonl(vtag);
5855                         /* get a TSN to use too */
5856                         initack->init.initial_tsn = htonl(sctp_select_initial_TSN(&inp->sctp_ep));
5857                         SCTP_INP_RLOCK(inp);
5858                         SCTP_INP_DECR_REF(inp);
5859                 }
5860         }
5861         /* save away my tag to */
5862         stc.my_vtag = initack->init.initiate_tag;
5863
5864         /* set up some of the credits. */
5865         so = inp->sctp_socket;
5866         if (so == NULL) {
5867                 /* memory problem */
5868                 sctp_m_freem(m);
5869                 return;
5870         } else {
5871                 initack->init.a_rwnd = htonl(max(SCTP_SB_LIMIT_RCV(so), SCTP_MINIMAL_RWND));
5872         }
5873         /* set what I want */
5874         his_limit = ntohs(init_chk->init.num_inbound_streams);
5875         /* choose what I want */
5876         if (asoc != NULL) {
5877                 if (asoc->streamoutcnt > asoc->pre_open_streams) {
5878                         i_want = asoc->streamoutcnt;
5879                 } else {
5880                         i_want = asoc->pre_open_streams;
5881                 }
5882         } else {
5883                 i_want = inp->sctp_ep.pre_open_stream_count;
5884         }
5885         if (his_limit < i_want) {
5886                 /* I Want more :< */
5887                 initack->init.num_outbound_streams = init_chk->init.num_inbound_streams;
5888         } else {
5889                 /* I can have what I want :> */
5890                 initack->init.num_outbound_streams = htons(i_want);
5891         }
5892         /* tell him his limit. */
5893         initack->init.num_inbound_streams =
5894             htons(inp->sctp_ep.max_open_streams_intome);
5895
5896         /* adaptation layer indication parameter */
5897         if (inp->sctp_ep.adaptation_layer_indicator_provided) {
5898                 parameter_len = (uint16_t)sizeof(struct sctp_adaptation_layer_indication);
5899                 ali = (struct sctp_adaptation_layer_indication *)(mtod(m, caddr_t)+chunk_len);
5900                 ali->ph.param_type = htons(SCTP_ULP_ADAPTATION);
5901                 ali->ph.param_length = htons(parameter_len);
5902                 ali->indication = htonl(inp->sctp_ep.adaptation_layer_indicator);
5903                 chunk_len += parameter_len;
5904         }
5905         /* ECN parameter */
5906         if (((asoc != NULL) && (asoc->ecn_supported == 1)) ||
5907             ((asoc == NULL) && (inp->ecn_supported == 1))) {
5908                 parameter_len = (uint16_t)sizeof(struct sctp_paramhdr);
5909                 ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
5910                 ph->param_type = htons(SCTP_ECN_CAPABLE);
5911                 ph->param_length = htons(parameter_len);
5912                 chunk_len += parameter_len;
5913         }
5914         /* PR-SCTP supported parameter */
5915         if (((asoc != NULL) && (asoc->prsctp_supported == 1)) ||
5916             ((asoc == NULL) && (inp->prsctp_supported == 1))) {
5917                 parameter_len = (uint16_t)sizeof(struct sctp_paramhdr);
5918                 ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
5919                 ph->param_type = htons(SCTP_PRSCTP_SUPPORTED);
5920                 ph->param_length = htons(parameter_len);
5921                 chunk_len += parameter_len;
5922         }
5923         /* Add NAT friendly parameter */
5924         if (nat_friendly) {
5925                 parameter_len = (uint16_t)sizeof(struct sctp_paramhdr);
5926                 ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
5927                 ph->param_type = htons(SCTP_HAS_NAT_SUPPORT);
5928                 ph->param_length = htons(parameter_len);
5929                 chunk_len += parameter_len;
5930         }
5931         /* And now tell the peer which extensions we support */
5932         num_ext = 0;
5933         pr_supported = (struct sctp_supported_chunk_types_param *)(mtod(m, caddr_t)+chunk_len);
5934         if (((asoc != NULL) && (asoc->prsctp_supported == 1)) ||
5935             ((asoc == NULL) && (inp->prsctp_supported == 1))) {
5936                 pr_supported->chunk_types[num_ext++] = SCTP_FORWARD_CUM_TSN;
5937                 if (((asoc != NULL) && (asoc->idata_supported == 1)) ||
5938                     ((asoc == NULL) && (inp->idata_supported == 1))) {
5939                         pr_supported->chunk_types[num_ext++] = SCTP_IFORWARD_CUM_TSN;
5940                 }
5941         }
5942         if (((asoc != NULL) && (asoc->auth_supported == 1)) ||
5943             ((asoc == NULL) && (inp->auth_supported == 1))) {
5944                 pr_supported->chunk_types[num_ext++] = SCTP_AUTHENTICATION;
5945         }
5946         if (((asoc != NULL) && (asoc->asconf_supported == 1)) ||
5947             ((asoc == NULL) && (inp->asconf_supported == 1))) {
5948                 pr_supported->chunk_types[num_ext++] = SCTP_ASCONF;
5949                 pr_supported->chunk_types[num_ext++] = SCTP_ASCONF_ACK;
5950         }
5951         if (((asoc != NULL) && (asoc->reconfig_supported == 1)) ||
5952             ((asoc == NULL) && (inp->reconfig_supported == 1))) {
5953                 pr_supported->chunk_types[num_ext++] = SCTP_STREAM_RESET;
5954         }
5955         if (((asoc != NULL) && (asoc->idata_supported == 1)) ||
5956             ((asoc == NULL) && (inp->idata_supported == 1))) {
5957                 pr_supported->chunk_types[num_ext++] = SCTP_IDATA;
5958         }
5959         if (((asoc != NULL) && (asoc->nrsack_supported == 1)) ||
5960             ((asoc == NULL) && (inp->nrsack_supported == 1))) {
5961                 pr_supported->chunk_types[num_ext++] = SCTP_NR_SELECTIVE_ACK;
5962         }
5963         if (((asoc != NULL) && (asoc->pktdrop_supported == 1)) ||
5964             ((asoc == NULL) && (inp->pktdrop_supported == 1))) {
5965                 pr_supported->chunk_types[num_ext++] = SCTP_PACKET_DROPPED;
5966         }
5967         if (num_ext > 0) {
5968                 parameter_len = (uint16_t)sizeof(struct sctp_supported_chunk_types_param) + num_ext;
5969                 pr_supported->ph.param_type = htons(SCTP_SUPPORTED_CHUNK_EXT);
5970                 pr_supported->ph.param_length = htons(parameter_len);
5971                 padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
5972                 chunk_len += parameter_len;
5973         }
5974         /* add authentication parameters */
5975         if (((asoc != NULL) && (asoc->auth_supported == 1)) ||
5976             ((asoc == NULL) && (inp->auth_supported == 1))) {
5977                 struct sctp_auth_random *randp;
5978                 struct sctp_auth_hmac_algo *hmacs;
5979                 struct sctp_auth_chunk_list *chunks;
5980
5981                 if (padding_len > 0) {
5982                         memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
5983                         chunk_len += padding_len;
5984                         padding_len = 0;
5985                 }
5986                 /* generate and add RANDOM parameter */
5987                 randp = (struct sctp_auth_random *)(mtod(m, caddr_t)+chunk_len);
5988                 parameter_len = (uint16_t)sizeof(struct sctp_auth_random) +
5989                     SCTP_AUTH_RANDOM_SIZE_DEFAULT;
5990                 randp->ph.param_type = htons(SCTP_RANDOM);
5991                 randp->ph.param_length = htons(parameter_len);
5992                 SCTP_READ_RANDOM(randp->random_data, SCTP_AUTH_RANDOM_SIZE_DEFAULT);
5993                 padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
5994                 chunk_len += parameter_len;
5995
5996                 if (padding_len > 0) {
5997                         memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
5998                         chunk_len += padding_len;
5999                         padding_len = 0;
6000                 }
6001                 /* add HMAC_ALGO parameter */
6002                 hmacs = (struct sctp_auth_hmac_algo *)(mtod(m, caddr_t)+chunk_len);
6003                 parameter_len = (uint16_t)sizeof(struct sctp_auth_hmac_algo) +
6004                     sctp_serialize_hmaclist(inp->sctp_ep.local_hmacs,
6005                     (uint8_t *)hmacs->hmac_ids);
6006                 hmacs->ph.param_type = htons(SCTP_HMAC_LIST);
6007                 hmacs->ph.param_length = htons(parameter_len);
6008                 padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
6009                 chunk_len += parameter_len;
6010
6011                 if (padding_len > 0) {
6012                         memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
6013                         chunk_len += padding_len;
6014                         padding_len = 0;
6015                 }
6016                 /* add CHUNKS parameter */
6017                 chunks = (struct sctp_auth_chunk_list *)(mtod(m, caddr_t)+chunk_len);
6018                 parameter_len = (uint16_t)sizeof(struct sctp_auth_chunk_list) +
6019                     sctp_serialize_auth_chunks(inp->sctp_ep.local_auth_chunks,
6020                     chunks->chunk_types);
6021                 chunks->ph.param_type = htons(SCTP_CHUNK_LIST);
6022                 chunks->ph.param_length = htons(parameter_len);
6023                 padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
6024                 chunk_len += parameter_len;
6025         }
6026         SCTP_BUF_LEN(m) = chunk_len;
6027         m_last = m;
6028         /* now the addresses */
6029         /*
6030          * To optimize this we could put the scoping stuff into a structure
6031          * and remove the individual uint8's from the stc structure. Then we
6032          * could just sifa in the address within the stc.. but for now this
6033          * is a quick hack to get the address stuff teased apart.
6034          */
6035         scp.ipv4_addr_legal = stc.ipv4_addr_legal;
6036         scp.ipv6_addr_legal = stc.ipv6_addr_legal;
6037         scp.loopback_scope = stc.loopback_scope;
6038         scp.ipv4_local_scope = stc.ipv4_scope;
6039         scp.local_scope = stc.local_scope;
6040         scp.site_scope = stc.site_scope;
6041         m_last = sctp_add_addresses_to_i_ia(inp, stcb, &scp, m_last,
6042             cnt_inits_to,
6043             &padding_len, &chunk_len);
6044         /* padding_len can only be positive, if no addresses have been added */
6045         if (padding_len > 0) {
6046                 memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
6047                 chunk_len += padding_len;
6048                 SCTP_BUF_LEN(m) += padding_len;
6049                 padding_len = 0;
6050         }
6051         /* tack on the operational error if present */
6052         if (op_err) {
6053                 parameter_len = 0;
6054                 for (m_tmp = op_err; m_tmp != NULL; m_tmp = SCTP_BUF_NEXT(m_tmp)) {
6055                         parameter_len += SCTP_BUF_LEN(m_tmp);
6056                 }
6057                 padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
6058                 SCTP_BUF_NEXT(m_last) = op_err;
6059                 while (SCTP_BUF_NEXT(m_last) != NULL) {
6060                         m_last = SCTP_BUF_NEXT(m_last);
6061                 }
6062                 chunk_len += parameter_len;
6063         }
6064         if (padding_len > 0) {
6065                 m_last = sctp_add_pad_tombuf(m_last, padding_len);
6066                 if (m_last == NULL) {
6067                         /* Houston we have a problem, no space */
6068                         sctp_m_freem(m);
6069                         return;
6070                 }
6071                 chunk_len += padding_len;
6072                 padding_len = 0;
6073         }
6074         /* Now we must build a cookie */
6075         m_cookie = sctp_add_cookie(init_pkt, offset, m, 0, &stc, &signature);
6076         if (m_cookie == NULL) {
6077                 /* memory problem */
6078                 sctp_m_freem(m);
6079                 return;
6080         }
6081         /* Now append the cookie to the end and update the space/size */
6082         SCTP_BUF_NEXT(m_last) = m_cookie;
6083         parameter_len = 0;
6084         for (m_tmp = m_cookie; m_tmp != NULL; m_tmp = SCTP_BUF_NEXT(m_tmp)) {
6085                 parameter_len += SCTP_BUF_LEN(m_tmp);
6086                 if (SCTP_BUF_NEXT(m_tmp) == NULL) {
6087                         m_last = m_tmp;
6088                 }
6089         }
6090         padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
6091         chunk_len += parameter_len;
6092
6093         /*
6094          * Place in the size, but we don't include the last pad (if any) in
6095          * the INIT-ACK.
6096          */
6097         initack->ch.chunk_length = htons(chunk_len);
6098
6099         /*
6100          * Time to sign the cookie, we don't sign over the cookie signature
6101          * though thus we set trailer.
6102          */
6103         (void)sctp_hmac_m(SCTP_HMAC,
6104             (uint8_t *)inp->sctp_ep.secret_key[(int)(inp->sctp_ep.current_secret_number)],
6105             SCTP_SECRET_SIZE, m_cookie, sizeof(struct sctp_paramhdr),
6106             (uint8_t *)signature, SCTP_SIGNATURE_SIZE);
6107         /*
6108          * We sifa 0 here to NOT set IP_DF if its IPv4, we ignore the return
6109          * here since the timer will drive a retranmission.
6110          */
6111         if (padding_len > 0) {
6112                 if (sctp_add_pad_tombuf(m_last, padding_len) == NULL) {
6113                         sctp_m_freem(m);
6114                         return;
6115                 }
6116         }
6117         if (stc.loopback_scope) {
6118                 over_addr = (union sctp_sockstore *)dst;
6119         } else {
6120                 over_addr = NULL;
6121         }
6122
6123         if ((error = sctp_lowlevel_chunk_output(inp, NULL, NULL, to, m, 0, NULL, 0, 0,
6124             0, 0,
6125             inp->sctp_lport, sh->src_port, init_chk->init.initiate_tag,
6126             port, over_addr,
6127             mflowtype, mflowid,
6128             SCTP_SO_NOT_LOCKED))) {
6129                 SCTPDBG(SCTP_DEBUG_OUTPUT4, "Gak send error %d\n", error);
6130                 if (error == ENOBUFS) {
6131                         if (asoc != NULL) {
6132                                 asoc->ifp_had_enobuf = 1;
6133                         }
6134                         SCTP_STAT_INCR(sctps_lowlevelerr);
6135                 }
6136         } else {
6137                 if (asoc != NULL) {
6138                         asoc->ifp_had_enobuf = 0;
6139                 }
6140         }
6141         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
6142 }
6143
6144
6145 static void
6146 sctp_prune_prsctp(struct sctp_tcb *stcb,
6147     struct sctp_association *asoc,
6148     struct sctp_sndrcvinfo *srcv,
6149     int dataout)
6150 {
6151         int freed_spc = 0;
6152         struct sctp_tmit_chunk *chk, *nchk;
6153
6154         SCTP_TCB_LOCK_ASSERT(stcb);
6155         if ((asoc->prsctp_supported) &&
6156             (asoc->sent_queue_cnt_removeable > 0)) {
6157                 TAILQ_FOREACH(chk, &asoc->sent_queue, sctp_next) {
6158                         /*
6159                          * Look for chunks marked with the PR_SCTP flag AND
6160                          * the buffer space flag. If the one being sent is
6161                          * equal or greater priority then purge the old one
6162                          * and free some space.
6163                          */
6164                         if (PR_SCTP_BUF_ENABLED(chk->flags)) {
6165                                 /*
6166                                  * This one is PR-SCTP AND buffer space
6167                                  * limited type
6168                                  */
6169                                 if (chk->rec.data.timetodrop.tv_sec >= (long)srcv->sinfo_timetolive) {
6170                                         /*
6171                                          * Lower numbers equates to higher
6172                                          * priority so if the one we are
6173                                          * looking at has a larger or equal
6174                                          * priority we want to drop the data
6175                                          * and NOT retransmit it.
6176                                          */
6177                                         if (chk->data) {
6178                                                 /*
6179                                                  * We release the book_size
6180                                                  * if the mbuf is here
6181                                                  */
6182                                                 int ret_spc;
6183                                                 uint8_t sent;
6184
6185                                                 if (chk->sent > SCTP_DATAGRAM_UNSENT)
6186                                                         sent = 1;
6187                                                 else
6188                                                         sent = 0;
6189                                                 ret_spc = sctp_release_pr_sctp_chunk(stcb, chk,
6190                                                     sent,
6191                                                     SCTP_SO_LOCKED);
6192                                                 freed_spc += ret_spc;
6193                                                 if (freed_spc >= dataout) {
6194                                                         return;
6195                                                 }
6196                                         }       /* if chunk was present */
6197                                 }       /* if of sufficient priority */
6198                         }       /* if chunk has enabled */
6199                 }               /* tailqforeach */
6200
6201                 TAILQ_FOREACH_SAFE(chk, &asoc->send_queue, sctp_next, nchk) {
6202                         /* Here we must move to the sent queue and mark */
6203                         if (PR_SCTP_BUF_ENABLED(chk->flags)) {
6204                                 if (chk->rec.data.timetodrop.tv_sec >= (long)srcv->sinfo_timetolive) {
6205                                         if (chk->data) {
6206                                                 /*
6207                                                  * We release the book_size
6208                                                  * if the mbuf is here
6209                                                  */
6210                                                 int ret_spc;
6211
6212                                                 ret_spc = sctp_release_pr_sctp_chunk(stcb, chk,
6213                                                     0, SCTP_SO_LOCKED);
6214
6215                                                 freed_spc += ret_spc;
6216                                                 if (freed_spc >= dataout) {
6217                                                         return;
6218                                                 }
6219                                         }       /* end if chk->data */
6220                                 }       /* end if right class */
6221                         }       /* end if chk pr-sctp */
6222                 }               /* tailqforeachsafe (chk) */
6223         }                       /* if enabled in asoc */
6224 }
6225
6226 int
6227 sctp_get_frag_point(struct sctp_tcb *stcb,
6228     struct sctp_association *asoc)
6229 {
6230         int siz, ovh;
6231
6232         /*
6233          * For endpoints that have both v6 and v4 addresses we must reserve
6234          * room for the ipv6 header, for those that are only dealing with V4
6235          * we use a larger frag point.
6236          */
6237         if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
6238                 ovh = SCTP_MIN_OVERHEAD;
6239         } else {
6240                 ovh = SCTP_MIN_V4_OVERHEAD;
6241         }
6242         ovh += SCTP_DATA_CHUNK_OVERHEAD(stcb);
6243         if (stcb->asoc.sctp_frag_point > asoc->smallest_mtu)
6244                 siz = asoc->smallest_mtu - ovh;
6245         else
6246                 siz = (stcb->asoc.sctp_frag_point - ovh);
6247         /*
6248          * if (siz > (MCLBYTES-sizeof(struct sctp_data_chunk))) {
6249          */
6250         /* A data chunk MUST fit in a cluster */
6251         /* siz = (MCLBYTES - sizeof(struct sctp_data_chunk)); */
6252         /* } */
6253
6254         /* adjust for an AUTH chunk if DATA requires auth */
6255         if (sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks))
6256                 siz -= sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
6257
6258         if (siz % 4) {
6259                 /* make it an even word boundary please */
6260                 siz -= (siz % 4);
6261         }
6262         return (siz);
6263 }
6264
6265 static void
6266 sctp_set_prsctp_policy(struct sctp_stream_queue_pending *sp)
6267 {
6268         /*
6269          * We assume that the user wants PR_SCTP_TTL if the user provides a
6270          * positive lifetime but does not specify any PR_SCTP policy.
6271          */
6272         if (PR_SCTP_ENABLED(sp->sinfo_flags)) {
6273                 sp->act_flags |= PR_SCTP_POLICY(sp->sinfo_flags);
6274         } else if (sp->timetolive > 0) {
6275                 sp->sinfo_flags |= SCTP_PR_SCTP_TTL;
6276                 sp->act_flags |= PR_SCTP_POLICY(sp->sinfo_flags);
6277         } else {
6278                 return;
6279         }
6280         switch (PR_SCTP_POLICY(sp->sinfo_flags)) {
6281         case CHUNK_FLAGS_PR_SCTP_BUF:
6282                 /*
6283                  * Time to live is a priority stored in tv_sec when doing
6284                  * the buffer drop thing.
6285                  */
6286                 sp->ts.tv_sec = sp->timetolive;
6287                 sp->ts.tv_usec = 0;
6288                 break;
6289         case CHUNK_FLAGS_PR_SCTP_TTL:
6290                 {
6291                         struct timeval tv;
6292
6293                         (void)SCTP_GETTIME_TIMEVAL(&sp->ts);
6294                         tv.tv_sec = sp->timetolive / 1000;
6295                         tv.tv_usec = (sp->timetolive * 1000) % 1000000;
6296                         /*
6297                          * TODO sctp_constants.h needs alternative time
6298                          * macros when _KERNEL is undefined.
6299                          */
6300                         timevaladd(&sp->ts, &tv);
6301                 }
6302                 break;
6303         case CHUNK_FLAGS_PR_SCTP_RTX:
6304                 /*
6305                  * Time to live is a the number or retransmissions stored in
6306                  * tv_sec.
6307                  */
6308                 sp->ts.tv_sec = sp->timetolive;
6309                 sp->ts.tv_usec = 0;
6310                 break;
6311         default:
6312                 SCTPDBG(SCTP_DEBUG_USRREQ1,
6313                     "Unknown PR_SCTP policy %u.\n",
6314                     PR_SCTP_POLICY(sp->sinfo_flags));
6315                 break;
6316         }
6317 }
6318
6319 static int
6320 sctp_msg_append(struct sctp_tcb *stcb,
6321     struct sctp_nets *net,
6322     struct mbuf *m,
6323     struct sctp_sndrcvinfo *srcv, int hold_stcb_lock)
6324 {
6325         int error = 0;
6326         struct mbuf *at;
6327         struct sctp_stream_queue_pending *sp = NULL;
6328         struct sctp_stream_out *strm;
6329
6330         /*
6331          * Given an mbuf chain, put it into the association send queue and
6332          * place it on the wheel
6333          */
6334         if (srcv->sinfo_stream >= stcb->asoc.streamoutcnt) {
6335                 /* Invalid stream number */
6336                 SCTP_LTRACE_ERR_RET_PKT(m, NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
6337                 error = EINVAL;
6338                 goto out_now;
6339         }
6340         if ((stcb->asoc.stream_locked) &&
6341             (stcb->asoc.stream_locked_on != srcv->sinfo_stream)) {
6342                 SCTP_LTRACE_ERR_RET_PKT(m, NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
6343                 error = EINVAL;
6344                 goto out_now;
6345         }
6346         strm = &stcb->asoc.strmout[srcv->sinfo_stream];
6347         /* Now can we send this? */
6348         if ((SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_SENT) ||
6349             (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) ||
6350             (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_RECEIVED) ||
6351             (stcb->asoc.state & SCTP_STATE_SHUTDOWN_PENDING)) {
6352                 /* got data while shutting down */
6353                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
6354                 error = ECONNRESET;
6355                 goto out_now;
6356         }
6357         sctp_alloc_a_strmoq(stcb, sp);
6358         if (sp == NULL) {
6359                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
6360                 error = ENOMEM;
6361                 goto out_now;
6362         }
6363         sp->sinfo_flags = srcv->sinfo_flags;
6364         sp->timetolive = srcv->sinfo_timetolive;
6365         sp->ppid = srcv->sinfo_ppid;
6366         sp->context = srcv->sinfo_context;
6367         sp->fsn = 0;
6368         if (sp->sinfo_flags & SCTP_ADDR_OVER) {
6369                 sp->net = net;
6370                 atomic_add_int(&sp->net->ref_count, 1);
6371         } else {
6372                 sp->net = NULL;
6373         }
6374         (void)SCTP_GETTIME_TIMEVAL(&sp->ts);
6375         sp->sid = srcv->sinfo_stream;
6376         sp->msg_is_complete = 1;
6377         sp->sender_all_done = 1;
6378         sp->some_taken = 0;
6379         sp->data = m;
6380         sp->tail_mbuf = NULL;
6381         sctp_set_prsctp_policy(sp);
6382         /*
6383          * We could in theory (for sendall) sifa the length in, but we would
6384          * still have to hunt through the chain since we need to setup the
6385          * tail_mbuf
6386          */
6387         sp->length = 0;
6388         for (at = m; at; at = SCTP_BUF_NEXT(at)) {
6389                 if (SCTP_BUF_NEXT(at) == NULL)
6390                         sp->tail_mbuf = at;
6391                 sp->length += SCTP_BUF_LEN(at);
6392         }
6393         if (srcv->sinfo_keynumber_valid) {
6394                 sp->auth_keyid = srcv->sinfo_keynumber;
6395         } else {
6396                 sp->auth_keyid = stcb->asoc.authinfo.active_keyid;
6397         }
6398         if (sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks)) {
6399                 sctp_auth_key_acquire(stcb, sp->auth_keyid);
6400                 sp->holds_key_ref = 1;
6401         }
6402         if (hold_stcb_lock == 0) {
6403                 SCTP_TCB_SEND_LOCK(stcb);
6404         }
6405         sctp_snd_sb_alloc(stcb, sp->length);
6406         atomic_add_int(&stcb->asoc.stream_queue_cnt, 1);
6407         TAILQ_INSERT_TAIL(&strm->outqueue, sp, next);
6408         stcb->asoc.ss_functions.sctp_ss_add_to_stream(stcb, &stcb->asoc, strm, sp, 1);
6409         m = NULL;
6410         if (hold_stcb_lock == 0) {
6411                 SCTP_TCB_SEND_UNLOCK(stcb);
6412         }
6413 out_now:
6414         if (m) {
6415                 sctp_m_freem(m);
6416         }
6417         return (error);
6418 }
6419
6420
6421 static struct mbuf *
6422 sctp_copy_mbufchain(struct mbuf *clonechain,
6423     struct mbuf *outchain,
6424     struct mbuf **endofchain,
6425     int can_take_mbuf,
6426     int sizeofcpy,
6427     uint8_t copy_by_ref)
6428 {
6429         struct mbuf *m;
6430         struct mbuf *appendchain;
6431         caddr_t cp;
6432         int len;
6433
6434         if (endofchain == NULL) {
6435                 /* error */
6436 error_out:
6437                 if (outchain)
6438                         sctp_m_freem(outchain);
6439                 return (NULL);
6440         }
6441         if (can_take_mbuf) {
6442                 appendchain = clonechain;
6443         } else {
6444                 if (!copy_by_ref &&
6445                     (sizeofcpy <= (int)((((SCTP_BASE_SYSCTL(sctp_mbuf_threshold_count) - 1) * MLEN) + MHLEN)))
6446                     ) {
6447                         /* Its not in a cluster */
6448                         if (*endofchain == NULL) {
6449                                 /* lets get a mbuf cluster */
6450                                 if (outchain == NULL) {
6451                                         /* This is the general case */
6452                         new_mbuf:
6453                                         outchain = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_HEADER);
6454                                         if (outchain == NULL) {
6455                                                 goto error_out;
6456                                         }
6457                                         SCTP_BUF_LEN(outchain) = 0;
6458                                         *endofchain = outchain;
6459                                         /* get the prepend space */
6460                                         SCTP_BUF_RESV_UF(outchain, (SCTP_FIRST_MBUF_RESV + 4));
6461                                 } else {
6462                                         /*
6463                                          * We really should not get a NULL
6464                                          * in endofchain
6465                                          */
6466                                         /* find end */
6467                                         m = outchain;
6468                                         while (m) {
6469                                                 if (SCTP_BUF_NEXT(m) == NULL) {
6470                                                         *endofchain = m;
6471                                                         break;
6472                                                 }
6473                                                 m = SCTP_BUF_NEXT(m);
6474                                         }
6475                                         /* sanity */
6476                                         if (*endofchain == NULL) {
6477                                                 /*
6478                                                  * huh, TSNH XXX maybe we
6479                                                  * should panic
6480                                                  */
6481                                                 sctp_m_freem(outchain);
6482                                                 goto new_mbuf;
6483                                         }
6484                                 }
6485                                 /* get the new end of length */
6486                                 len = (int)M_TRAILINGSPACE(*endofchain);
6487                         } else {
6488                                 /* how much is left at the end? */
6489                                 len = (int)M_TRAILINGSPACE(*endofchain);
6490                         }
6491                         /* Find the end of the data, for appending */
6492                         cp = (mtod((*endofchain), caddr_t)+SCTP_BUF_LEN((*endofchain)));
6493
6494                         /* Now lets copy it out */
6495                         if (len >= sizeofcpy) {
6496                                 /* It all fits, copy it in */
6497                                 m_copydata(clonechain, 0, sizeofcpy, cp);
6498                                 SCTP_BUF_LEN((*endofchain)) += sizeofcpy;
6499                         } else {
6500                                 /* fill up the end of the chain */
6501                                 if (len > 0) {
6502                                         m_copydata(clonechain, 0, len, cp);
6503                                         SCTP_BUF_LEN((*endofchain)) += len;
6504                                         /* now we need another one */
6505                                         sizeofcpy -= len;
6506                                 }
6507                                 m = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_HEADER);
6508                                 if (m == NULL) {
6509                                         /* We failed */
6510                                         goto error_out;
6511                                 }
6512                                 SCTP_BUF_NEXT((*endofchain)) = m;
6513                                 *endofchain = m;
6514                                 cp = mtod((*endofchain), caddr_t);
6515                                 m_copydata(clonechain, len, sizeofcpy, cp);
6516                                 SCTP_BUF_LEN((*endofchain)) += sizeofcpy;
6517                         }
6518                         return (outchain);
6519                 } else {
6520                         /* copy the old fashion way */
6521                         appendchain = SCTP_M_COPYM(clonechain, 0, M_COPYALL, M_NOWAIT);
6522 #ifdef SCTP_MBUF_LOGGING
6523                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
6524                                 sctp_log_mbc(appendchain, SCTP_MBUF_ICOPY);
6525                         }
6526 #endif
6527                 }
6528         }
6529         if (appendchain == NULL) {
6530                 /* error */
6531                 if (outchain)
6532                         sctp_m_freem(outchain);
6533                 return (NULL);
6534         }
6535         if (outchain) {
6536                 /* tack on to the end */
6537                 if (*endofchain != NULL) {
6538                         SCTP_BUF_NEXT(((*endofchain))) = appendchain;
6539                 } else {
6540                         m = outchain;
6541                         while (m) {
6542                                 if (SCTP_BUF_NEXT(m) == NULL) {
6543                                         SCTP_BUF_NEXT(m) = appendchain;
6544                                         break;
6545                                 }
6546                                 m = SCTP_BUF_NEXT(m);
6547                         }
6548                 }
6549                 /*
6550                  * save off the end and update the end-chain position
6551                  */
6552                 m = appendchain;
6553                 while (m) {
6554                         if (SCTP_BUF_NEXT(m) == NULL) {
6555                                 *endofchain = m;
6556                                 break;
6557                         }
6558                         m = SCTP_BUF_NEXT(m);
6559                 }
6560                 return (outchain);
6561         } else {
6562                 /* save off the end and update the end-chain position */
6563                 m = appendchain;
6564                 while (m) {
6565                         if (SCTP_BUF_NEXT(m) == NULL) {
6566                                 *endofchain = m;
6567                                 break;
6568                         }
6569                         m = SCTP_BUF_NEXT(m);
6570                 }
6571                 return (appendchain);
6572         }
6573 }
6574
6575 static int
6576 sctp_med_chunk_output(struct sctp_inpcb *inp,
6577     struct sctp_tcb *stcb,
6578     struct sctp_association *asoc,
6579     int *num_out,
6580     int *reason_code,
6581     int control_only, int from_where,
6582     struct timeval *now, int *now_filled, int frag_point, int so_locked
6583 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
6584     SCTP_UNUSED
6585 #endif
6586 );
6587
6588 static void
6589 sctp_sendall_iterator(struct sctp_inpcb *inp, struct sctp_tcb *stcb, void *ptr,
6590     uint32_t val SCTP_UNUSED)
6591 {
6592         struct sctp_copy_all *ca;
6593         struct mbuf *m;
6594         int ret = 0;
6595         int added_control = 0;
6596         int un_sent, do_chunk_output = 1;
6597         struct sctp_association *asoc;
6598         struct sctp_nets *net;
6599
6600         ca = (struct sctp_copy_all *)ptr;
6601         if (ca->m == NULL) {
6602                 return;
6603         }
6604         if (ca->inp != inp) {
6605                 /* TSNH */
6606                 return;
6607         }
6608         if (ca->sndlen > 0) {
6609                 m = SCTP_M_COPYM(ca->m, 0, M_COPYALL, M_NOWAIT);
6610                 if (m == NULL) {
6611                         /* can't copy so we are done */
6612                         ca->cnt_failed++;
6613                         return;
6614                 }
6615 #ifdef SCTP_MBUF_LOGGING
6616                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
6617                         sctp_log_mbc(m, SCTP_MBUF_ICOPY);
6618                 }
6619 #endif
6620         } else {
6621                 m = NULL;
6622         }
6623         SCTP_TCB_LOCK_ASSERT(stcb);
6624         if (stcb->asoc.alternate) {
6625                 net = stcb->asoc.alternate;
6626         } else {
6627                 net = stcb->asoc.primary_destination;
6628         }
6629         if (ca->sndrcv.sinfo_flags & SCTP_ABORT) {
6630                 /* Abort this assoc with m as the user defined reason */
6631                 if (m != NULL) {
6632                         SCTP_BUF_PREPEND(m, sizeof(struct sctp_paramhdr), M_NOWAIT);
6633                 } else {
6634                         m = sctp_get_mbuf_for_msg(sizeof(struct sctp_paramhdr),
6635                             0, M_NOWAIT, 1, MT_DATA);
6636                         SCTP_BUF_LEN(m) = sizeof(struct sctp_paramhdr);
6637                 }
6638                 if (m != NULL) {
6639                         struct sctp_paramhdr *ph;
6640
6641                         ph = mtod(m, struct sctp_paramhdr *);
6642                         ph->param_type = htons(SCTP_CAUSE_USER_INITIATED_ABT);
6643                         ph->param_length = htons((uint16_t)(sizeof(struct sctp_paramhdr) + ca->sndlen));
6644                 }
6645                 /*
6646                  * We add one here to keep the assoc from dis-appearing on
6647                  * us.
6648                  */
6649                 atomic_add_int(&stcb->asoc.refcnt, 1);
6650                 sctp_abort_an_association(inp, stcb, m, SCTP_SO_NOT_LOCKED);
6651                 /*
6652                  * sctp_abort_an_association calls sctp_free_asoc() free
6653                  * association will NOT free it since we incremented the
6654                  * refcnt .. we do this to prevent it being freed and things
6655                  * getting tricky since we could end up (from free_asoc)
6656                  * calling inpcb_free which would get a recursive lock call
6657                  * to the iterator lock.. But as a consequence of that the
6658                  * stcb will return to us un-locked.. since free_asoc
6659                  * returns with either no TCB or the TCB unlocked, we must
6660                  * relock.. to unlock in the iterator timer :-0
6661                  */
6662                 SCTP_TCB_LOCK(stcb);
6663                 atomic_add_int(&stcb->asoc.refcnt, -1);
6664                 goto no_chunk_output;
6665         } else {
6666                 if (m) {
6667                         ret = sctp_msg_append(stcb, net, m,
6668                             &ca->sndrcv, 1);
6669                 }
6670                 asoc = &stcb->asoc;
6671                 if (ca->sndrcv.sinfo_flags & SCTP_EOF) {
6672                         /* shutdown this assoc */
6673                         if (TAILQ_EMPTY(&asoc->send_queue) &&
6674                             TAILQ_EMPTY(&asoc->sent_queue) &&
6675                             sctp_is_there_unsent_data(stcb, SCTP_SO_NOT_LOCKED) == 0) {
6676                                 if ((*asoc->ss_functions.sctp_ss_is_user_msgs_incomplete) (stcb, asoc)) {
6677                                         goto abort_anyway;
6678                                 }
6679                                 /*
6680                                  * there is nothing queued to send, so I'm
6681                                  * done...
6682                                  */
6683                                 if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) &&
6684                                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
6685                                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
6686                                         /*
6687                                          * only send SHUTDOWN the first time
6688                                          * through
6689                                          */
6690                                         if (SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) {
6691                                                 SCTP_STAT_DECR_GAUGE32(sctps_currestab);
6692                                         }
6693                                         SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_SENT);
6694                                         SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING);
6695                                         sctp_stop_timers_for_shutdown(stcb);
6696                                         sctp_send_shutdown(stcb, net);
6697                                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb,
6698                                             net);
6699                                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
6700                                             asoc->primary_destination);
6701                                         added_control = 1;
6702                                         do_chunk_output = 0;
6703                                 }
6704                         } else {
6705                                 /*
6706                                  * we still got (or just got) data to send,
6707                                  * so set SHUTDOWN_PENDING
6708                                  */
6709                                 /*
6710                                  * XXX sockets draft says that SCTP_EOF
6711                                  * should be sent with no data.  currently,
6712                                  * we will allow user data to be sent first
6713                                  * and move to SHUTDOWN-PENDING
6714                                  */
6715                                 if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) &&
6716                                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
6717                                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
6718                                         if ((*asoc->ss_functions.sctp_ss_is_user_msgs_incomplete) (stcb, asoc)) {
6719                                                 asoc->state |= SCTP_STATE_PARTIAL_MSG_LEFT;
6720                                         }
6721                                         asoc->state |= SCTP_STATE_SHUTDOWN_PENDING;
6722                                         if (TAILQ_EMPTY(&asoc->send_queue) &&
6723                                             TAILQ_EMPTY(&asoc->sent_queue) &&
6724                                             (asoc->state & SCTP_STATE_PARTIAL_MSG_LEFT)) {
6725                                                 struct mbuf *op_err;
6726                                                 char msg[SCTP_DIAG_INFO_LEN];
6727
6728                                 abort_anyway:
6729                                                 snprintf(msg, sizeof(msg),
6730                                                     "%s:%d at %s", __FILE__, __LINE__, __func__);
6731                                                 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
6732                                                     msg);
6733                                                 atomic_add_int(&stcb->asoc.refcnt, 1);
6734                                                 sctp_abort_an_association(stcb->sctp_ep, stcb,
6735                                                     op_err, SCTP_SO_NOT_LOCKED);
6736                                                 atomic_add_int(&stcb->asoc.refcnt, -1);
6737                                                 goto no_chunk_output;
6738                                         }
6739                                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
6740                                             asoc->primary_destination);
6741                                 }
6742                         }
6743
6744                 }
6745         }
6746         un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
6747             (stcb->asoc.stream_queue_cnt * SCTP_DATA_CHUNK_OVERHEAD(stcb)));
6748
6749         if ((sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY)) &&
6750             (stcb->asoc.total_flight > 0) &&
6751             (un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD))) {
6752                 do_chunk_output = 0;
6753         }
6754         if (do_chunk_output)
6755                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_NOT_LOCKED);
6756         else if (added_control) {
6757                 int num_out, reason, now_filled = 0;
6758                 struct timeval now;
6759                 int frag_point;
6760
6761                 frag_point = sctp_get_frag_point(stcb, &stcb->asoc);
6762                 (void)sctp_med_chunk_output(inp, stcb, &stcb->asoc, &num_out,
6763                     &reason, 1, 1, &now, &now_filled, frag_point, SCTP_SO_NOT_LOCKED);
6764         }
6765 no_chunk_output:
6766         if (ret) {
6767                 ca->cnt_failed++;
6768         } else {
6769                 ca->cnt_sent++;
6770         }
6771 }
6772
6773 static void
6774 sctp_sendall_completes(void *ptr, uint32_t val SCTP_UNUSED)
6775 {
6776         struct sctp_copy_all *ca;
6777
6778         ca = (struct sctp_copy_all *)ptr;
6779         /*
6780          * Do a notify here? Kacheong suggests that the notify be done at
6781          * the send time.. so you would push up a notification if any send
6782          * failed. Don't know if this is feasible since the only failures we
6783          * have is "memory" related and if you cannot get an mbuf to send
6784          * the data you surely can't get an mbuf to send up to notify the
6785          * user you can't send the data :->
6786          */
6787
6788         /* now free everything */
6789         sctp_m_freem(ca->m);
6790         SCTP_FREE(ca, SCTP_M_COPYAL);
6791 }
6792
6793 static struct mbuf *
6794 sctp_copy_out_all(struct uio *uio, int len)
6795 {
6796         struct mbuf *ret, *at;
6797         int left, willcpy, cancpy, error;
6798
6799         ret = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_WAITOK, 1, MT_DATA);
6800         if (ret == NULL) {
6801                 /* TSNH */
6802                 return (NULL);
6803         }
6804         left = len;
6805         SCTP_BUF_LEN(ret) = 0;
6806         /* save space for the data chunk header */
6807         cancpy = (int)M_TRAILINGSPACE(ret);
6808         willcpy = min(cancpy, left);
6809         at = ret;
6810         while (left > 0) {
6811                 /* Align data to the end */
6812                 error = uiomove(mtod(at, caddr_t), willcpy, uio);
6813                 if (error) {
6814         err_out_now:
6815                         sctp_m_freem(at);
6816                         return (NULL);
6817                 }
6818                 SCTP_BUF_LEN(at) = willcpy;
6819                 SCTP_BUF_NEXT_PKT(at) = SCTP_BUF_NEXT(at) = 0;
6820                 left -= willcpy;
6821                 if (left > 0) {
6822                         SCTP_BUF_NEXT(at) = sctp_get_mbuf_for_msg(left, 0, M_WAITOK, 1, MT_DATA);
6823                         if (SCTP_BUF_NEXT(at) == NULL) {
6824                                 goto err_out_now;
6825                         }
6826                         at = SCTP_BUF_NEXT(at);
6827                         SCTP_BUF_LEN(at) = 0;
6828                         cancpy = (int)M_TRAILINGSPACE(at);
6829                         willcpy = min(cancpy, left);
6830                 }
6831         }
6832         return (ret);
6833 }
6834
6835 static int
6836 sctp_sendall(struct sctp_inpcb *inp, struct uio *uio, struct mbuf *m,
6837     struct sctp_sndrcvinfo *srcv)
6838 {
6839         int ret;
6840         struct sctp_copy_all *ca;
6841
6842         SCTP_MALLOC(ca, struct sctp_copy_all *, sizeof(struct sctp_copy_all),
6843             SCTP_M_COPYAL);
6844         if (ca == NULL) {
6845                 sctp_m_freem(m);
6846                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
6847                 return (ENOMEM);
6848         }
6849         memset(ca, 0, sizeof(struct sctp_copy_all));
6850
6851         ca->inp = inp;
6852         if (srcv) {
6853                 memcpy(&ca->sndrcv, srcv, sizeof(struct sctp_nonpad_sndrcvinfo));
6854         }
6855         /*
6856          * take off the sendall flag, it would be bad if we failed to do
6857          * this :-0
6858          */
6859         ca->sndrcv.sinfo_flags &= ~SCTP_SENDALL;
6860         /* get length and mbuf chain */
6861         if (uio) {
6862                 ca->sndlen = (int)uio->uio_resid;
6863                 ca->m = sctp_copy_out_all(uio, ca->sndlen);
6864                 if (ca->m == NULL) {
6865                         SCTP_FREE(ca, SCTP_M_COPYAL);
6866                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
6867                         return (ENOMEM);
6868                 }
6869         } else {
6870                 /* Gather the length of the send */
6871                 struct mbuf *mat;
6872
6873                 ca->sndlen = 0;
6874                 for (mat = m; mat; mat = SCTP_BUF_NEXT(mat)) {
6875                         ca->sndlen += SCTP_BUF_LEN(mat);
6876                 }
6877         }
6878         ret = sctp_initiate_iterator(NULL, sctp_sendall_iterator, NULL,
6879             SCTP_PCB_ANY_FLAGS, SCTP_PCB_ANY_FEATURES,
6880             SCTP_ASOC_ANY_STATE,
6881             (void *)ca, 0,
6882             sctp_sendall_completes, inp, 1);
6883         if (ret) {
6884                 SCTP_PRINTF("Failed to initiate iterator for sendall\n");
6885                 SCTP_FREE(ca, SCTP_M_COPYAL);
6886                 SCTP_LTRACE_ERR_RET_PKT(m, inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EFAULT);
6887                 return (EFAULT);
6888         }
6889         return (0);
6890 }
6891
6892
6893 void
6894 sctp_toss_old_cookies(struct sctp_tcb *stcb, struct sctp_association *asoc)
6895 {
6896         struct sctp_tmit_chunk *chk, *nchk;
6897
6898         TAILQ_FOREACH_SAFE(chk, &asoc->control_send_queue, sctp_next, nchk) {
6899                 if (chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
6900                         TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
6901                         asoc->ctrl_queue_cnt--;
6902                         if (chk->data) {
6903                                 sctp_m_freem(chk->data);
6904                                 chk->data = NULL;
6905                         }
6906                         sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
6907                 }
6908         }
6909 }
6910
6911 void
6912 sctp_toss_old_asconf(struct sctp_tcb *stcb)
6913 {
6914         struct sctp_association *asoc;
6915         struct sctp_tmit_chunk *chk, *nchk;
6916         struct sctp_asconf_chunk *acp;
6917
6918         asoc = &stcb->asoc;
6919         TAILQ_FOREACH_SAFE(chk, &asoc->asconf_send_queue, sctp_next, nchk) {
6920                 /* find SCTP_ASCONF chunk in queue */
6921                 if (chk->rec.chunk_id.id == SCTP_ASCONF) {
6922                         if (chk->data) {
6923                                 acp = mtod(chk->data, struct sctp_asconf_chunk *);
6924                                 if (SCTP_TSN_GT(ntohl(acp->serial_number), asoc->asconf_seq_out_acked)) {
6925                                         /* Not Acked yet */
6926                                         break;
6927                                 }
6928                         }
6929                         TAILQ_REMOVE(&asoc->asconf_send_queue, chk, sctp_next);
6930                         asoc->ctrl_queue_cnt--;
6931                         if (chk->data) {
6932                                 sctp_m_freem(chk->data);
6933                                 chk->data = NULL;
6934                         }
6935                         sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
6936                 }
6937         }
6938 }
6939
6940
6941 static void
6942 sctp_clean_up_datalist(struct sctp_tcb *stcb,
6943     struct sctp_association *asoc,
6944     struct sctp_tmit_chunk **data_list,
6945     int bundle_at,
6946     struct sctp_nets *net)
6947 {
6948         int i;
6949         struct sctp_tmit_chunk *tp1;
6950
6951         for (i = 0; i < bundle_at; i++) {
6952                 /* off of the send queue */
6953                 TAILQ_REMOVE(&asoc->send_queue, data_list[i], sctp_next);
6954                 asoc->send_queue_cnt--;
6955                 if (i > 0) {
6956                         /*
6957                          * Any chunk NOT 0 you zap the time chunk 0 gets
6958                          * zapped or set based on if a RTO measurment is
6959                          * needed.
6960                          */
6961                         data_list[i]->do_rtt = 0;
6962                 }
6963                 /* record time */
6964                 data_list[i]->sent_rcv_time = net->last_sent_time;
6965                 data_list[i]->rec.data.cwnd_at_send = net->cwnd;
6966                 data_list[i]->rec.data.fast_retran_tsn = data_list[i]->rec.data.tsn;
6967                 if (data_list[i]->whoTo == NULL) {
6968                         data_list[i]->whoTo = net;
6969                         atomic_add_int(&net->ref_count, 1);
6970                 }
6971                 /* on to the sent queue */
6972                 tp1 = TAILQ_LAST(&asoc->sent_queue, sctpchunk_listhead);
6973                 if ((tp1) && SCTP_TSN_GT(tp1->rec.data.tsn, data_list[i]->rec.data.tsn)) {
6974                         struct sctp_tmit_chunk *tpp;
6975
6976                         /* need to move back */
6977         back_up_more:
6978                         tpp = TAILQ_PREV(tp1, sctpchunk_listhead, sctp_next);
6979                         if (tpp == NULL) {
6980                                 TAILQ_INSERT_BEFORE(tp1, data_list[i], sctp_next);
6981                                 goto all_done;
6982                         }
6983                         tp1 = tpp;
6984                         if (SCTP_TSN_GT(tp1->rec.data.tsn, data_list[i]->rec.data.tsn)) {
6985                                 goto back_up_more;
6986                         }
6987                         TAILQ_INSERT_AFTER(&asoc->sent_queue, tp1, data_list[i], sctp_next);
6988                 } else {
6989                         TAILQ_INSERT_TAIL(&asoc->sent_queue,
6990                             data_list[i],
6991                             sctp_next);
6992                 }
6993 all_done:
6994                 /* This does not lower until the cum-ack passes it */
6995                 asoc->sent_queue_cnt++;
6996                 if ((asoc->peers_rwnd <= 0) &&
6997                     (asoc->total_flight == 0) &&
6998                     (bundle_at == 1)) {
6999                         /* Mark the chunk as being a window probe */
7000                         SCTP_STAT_INCR(sctps_windowprobed);
7001                 }
7002 #ifdef SCTP_AUDITING_ENABLED
7003                 sctp_audit_log(0xC2, 3);
7004 #endif
7005                 data_list[i]->sent = SCTP_DATAGRAM_SENT;
7006                 data_list[i]->snd_count = 1;
7007                 data_list[i]->rec.data.chunk_was_revoked = 0;
7008                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
7009                         sctp_misc_ints(SCTP_FLIGHT_LOG_UP,
7010                             data_list[i]->whoTo->flight_size,
7011                             data_list[i]->book_size,
7012                             (uint32_t)(uintptr_t)data_list[i]->whoTo,
7013                             data_list[i]->rec.data.tsn);
7014                 }
7015                 sctp_flight_size_increase(data_list[i]);
7016                 sctp_total_flight_increase(stcb, data_list[i]);
7017                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_RWND_ENABLE) {
7018                         sctp_log_rwnd(SCTP_DECREASE_PEER_RWND,
7019                             asoc->peers_rwnd, data_list[i]->send_size, SCTP_BASE_SYSCTL(sctp_peer_chunk_oh));
7020                 }
7021                 asoc->peers_rwnd = sctp_sbspace_sub(asoc->peers_rwnd,
7022                     (uint32_t)(data_list[i]->send_size + SCTP_BASE_SYSCTL(sctp_peer_chunk_oh)));
7023                 if (asoc->peers_rwnd < stcb->sctp_ep->sctp_ep.sctp_sws_sender) {
7024                         /* SWS sender side engages */
7025                         asoc->peers_rwnd = 0;
7026                 }
7027         }
7028         if (asoc->cc_functions.sctp_cwnd_update_packet_transmitted) {
7029                 (*asoc->cc_functions.sctp_cwnd_update_packet_transmitted) (stcb, net);
7030         }
7031 }
7032
7033 static void
7034 sctp_clean_up_ctl(struct sctp_tcb *stcb, struct sctp_association *asoc, int so_locked
7035 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
7036     SCTP_UNUSED
7037 #endif
7038 )
7039 {
7040         struct sctp_tmit_chunk *chk, *nchk;
7041
7042         TAILQ_FOREACH_SAFE(chk, &asoc->control_send_queue, sctp_next, nchk) {
7043                 if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
7044                     (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK) ||  /* EY */
7045                     (chk->rec.chunk_id.id == SCTP_HEARTBEAT_REQUEST) ||
7046                     (chk->rec.chunk_id.id == SCTP_HEARTBEAT_ACK) ||
7047                     (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN) ||
7048                     (chk->rec.chunk_id.id == SCTP_SHUTDOWN) ||
7049                     (chk->rec.chunk_id.id == SCTP_SHUTDOWN_ACK) ||
7050                     (chk->rec.chunk_id.id == SCTP_OPERATION_ERROR) ||
7051                     (chk->rec.chunk_id.id == SCTP_PACKET_DROPPED) ||
7052                     (chk->rec.chunk_id.id == SCTP_COOKIE_ACK) ||
7053                     (chk->rec.chunk_id.id == SCTP_ECN_CWR) ||
7054                     (chk->rec.chunk_id.id == SCTP_ASCONF_ACK)) {
7055                         /* Stray chunks must be cleaned up */
7056         clean_up_anyway:
7057                         TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
7058                         asoc->ctrl_queue_cnt--;
7059                         if (chk->data) {
7060                                 sctp_m_freem(chk->data);
7061                                 chk->data = NULL;
7062                         }
7063                         if (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN) {
7064                                 asoc->fwd_tsn_cnt--;
7065                         }
7066                         sctp_free_a_chunk(stcb, chk, so_locked);
7067                 } else if (chk->rec.chunk_id.id == SCTP_STREAM_RESET) {
7068                         /* special handling, we must look into the param */
7069                         if (chk != asoc->str_reset) {
7070                                 goto clean_up_anyway;
7071                         }
7072                 }
7073         }
7074 }
7075
7076 static uint32_t
7077 sctp_can_we_split_this(struct sctp_tcb *stcb, uint32_t length,
7078     uint32_t space_left, uint32_t frag_point, int eeor_on)
7079 {
7080         /*
7081          * Make a decision on if I should split a msg into multiple parts.
7082          * This is only asked of incomplete messages.
7083          */
7084         if (eeor_on) {
7085                 /*
7086                  * If we are doing EEOR we need to always send it if its the
7087                  * entire thing, since it might be all the guy is putting in
7088                  * the hopper.
7089                  */
7090                 if (space_left >= length) {
7091                         /*-
7092                          * If we have data outstanding,
7093                          * we get another chance when the sack
7094                          * arrives to transmit - wait for more data
7095                          */
7096                         if (stcb->asoc.total_flight == 0) {
7097                                 /*
7098                                  * If nothing is in flight, we zero the
7099                                  * packet counter.
7100                                  */
7101                                 return (length);
7102                         }
7103                         return (0);
7104
7105                 } else {
7106                         /* You can fill the rest */
7107                         return (space_left);
7108                 }
7109         }
7110         /*-
7111          * For those strange folk that make the send buffer
7112          * smaller than our fragmentation point, we can't
7113          * get a full msg in so we have to allow splitting.
7114          */
7115         if (SCTP_SB_LIMIT_SND(stcb->sctp_socket) < frag_point) {
7116                 return (length);
7117         }
7118         if ((length <= space_left) ||
7119             ((length - space_left) < SCTP_BASE_SYSCTL(sctp_min_residual))) {
7120                 /* Sub-optimial residual don't split in non-eeor mode. */
7121                 return (0);
7122         }
7123         /*
7124          * If we reach here length is larger than the space_left. Do we wish
7125          * to split it for the sake of packet putting together?
7126          */
7127         if (space_left >= min(SCTP_BASE_SYSCTL(sctp_min_split_point), frag_point)) {
7128                 /* Its ok to split it */
7129                 return (min(space_left, frag_point));
7130         }
7131         /* Nope, can't split */
7132         return (0);
7133 }
7134
7135 static uint32_t
7136 sctp_move_to_outqueue(struct sctp_tcb *stcb,
7137     struct sctp_stream_out *strq,
7138     uint32_t space_left,
7139     uint32_t frag_point,
7140     int *giveup,
7141     int eeor_mode,
7142     int *bail,
7143     int so_locked
7144 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
7145     SCTP_UNUSED
7146 #endif
7147 )
7148 {
7149         /* Move from the stream to the send_queue keeping track of the total */
7150         struct sctp_association *asoc;
7151         struct sctp_stream_queue_pending *sp;
7152         struct sctp_tmit_chunk *chk;
7153         struct sctp_data_chunk *dchkh = NULL;
7154         struct sctp_idata_chunk *ndchkh = NULL;
7155         uint32_t to_move, length;
7156         int leading;
7157         uint8_t rcv_flags = 0;
7158         uint8_t some_taken;
7159         uint8_t send_lock_up = 0;
7160
7161         SCTP_TCB_LOCK_ASSERT(stcb);
7162         asoc = &stcb->asoc;
7163 one_more_time:
7164         /* sa_ignore FREED_MEMORY */
7165         sp = TAILQ_FIRST(&strq->outqueue);
7166         if (sp == NULL) {
7167                 if (send_lock_up == 0) {
7168                         SCTP_TCB_SEND_LOCK(stcb);
7169                         send_lock_up = 1;
7170                 }
7171                 sp = TAILQ_FIRST(&strq->outqueue);
7172                 if (sp) {
7173                         goto one_more_time;
7174                 }
7175                 if ((sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_EXPLICIT_EOR) == 0) &&
7176                     (stcb->asoc.idata_supported == 0) &&
7177                     (strq->last_msg_incomplete)) {
7178                         SCTP_PRINTF("Huh? Stream:%d lm_in_c=%d but queue is NULL\n",
7179                             strq->sid,
7180                             strq->last_msg_incomplete);
7181                         strq->last_msg_incomplete = 0;
7182                 }
7183                 to_move = 0;
7184                 if (send_lock_up) {
7185                         SCTP_TCB_SEND_UNLOCK(stcb);
7186                         send_lock_up = 0;
7187                 }
7188                 goto out_of;
7189         }
7190         if ((sp->msg_is_complete) && (sp->length == 0)) {
7191                 if (sp->sender_all_done) {
7192                         /*
7193                          * We are doing differed cleanup. Last time through
7194                          * when we took all the data the sender_all_done was
7195                          * not set.
7196                          */
7197                         if ((sp->put_last_out == 0) && (sp->discard_rest == 0)) {
7198                                 SCTP_PRINTF("Gak, put out entire msg with NO end!-1\n");
7199                                 SCTP_PRINTF("sender_done:%d len:%d msg_comp:%d put_last_out:%d send_lock:%d\n",
7200                                     sp->sender_all_done,
7201                                     sp->length,
7202                                     sp->msg_is_complete,
7203                                     sp->put_last_out,
7204                                     send_lock_up);
7205                         }
7206                         if ((TAILQ_NEXT(sp, next) == NULL) && (send_lock_up == 0)) {
7207                                 SCTP_TCB_SEND_LOCK(stcb);
7208                                 send_lock_up = 1;
7209                         }
7210                         atomic_subtract_int(&asoc->stream_queue_cnt, 1);
7211                         TAILQ_REMOVE(&strq->outqueue, sp, next);
7212                         stcb->asoc.ss_functions.sctp_ss_remove_from_stream(stcb, asoc, strq, sp, send_lock_up);
7213                         if ((strq->state == SCTP_STREAM_RESET_PENDING) &&
7214                             (strq->chunks_on_queues == 0) &&
7215                             TAILQ_EMPTY(&strq->outqueue)) {
7216                                 stcb->asoc.trigger_reset = 1;
7217                         }
7218                         if (sp->net) {
7219                                 sctp_free_remote_addr(sp->net);
7220                                 sp->net = NULL;
7221                         }
7222                         if (sp->data) {
7223                                 sctp_m_freem(sp->data);
7224                                 sp->data = NULL;
7225                         }
7226                         sctp_free_a_strmoq(stcb, sp, so_locked);
7227                         /* we can't be locked to it */
7228                         if (send_lock_up) {
7229                                 SCTP_TCB_SEND_UNLOCK(stcb);
7230                                 send_lock_up = 0;
7231                         }
7232                         /* back to get the next msg */
7233                         goto one_more_time;
7234                 } else {
7235                         /*
7236                          * sender just finished this but still holds a
7237                          * reference
7238                          */
7239                         *giveup = 1;
7240                         to_move = 0;
7241                         goto out_of;
7242                 }
7243         } else {
7244                 /* is there some to get */
7245                 if (sp->length == 0) {
7246                         /* no */
7247                         *giveup = 1;
7248                         to_move = 0;
7249                         goto out_of;
7250                 } else if (sp->discard_rest) {
7251                         if (send_lock_up == 0) {
7252                                 SCTP_TCB_SEND_LOCK(stcb);
7253                                 send_lock_up = 1;
7254                         }
7255                         /* Whack down the size */
7256                         atomic_subtract_int(&stcb->asoc.total_output_queue_size, sp->length);
7257                         if ((stcb->sctp_socket != NULL) &&
7258                             ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
7259                             (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL))) {
7260                                 atomic_subtract_int(&stcb->sctp_socket->so_snd.sb_cc, sp->length);
7261                         }
7262                         if (sp->data) {
7263                                 sctp_m_freem(sp->data);
7264                                 sp->data = NULL;
7265                                 sp->tail_mbuf = NULL;
7266                         }
7267                         sp->length = 0;
7268                         sp->some_taken = 1;
7269                         *giveup = 1;
7270                         to_move = 0;
7271                         goto out_of;
7272                 }
7273         }
7274         some_taken = sp->some_taken;
7275 re_look:
7276         length = sp->length;
7277         if (sp->msg_is_complete) {
7278                 /* The message is complete */
7279                 to_move = min(length, frag_point);
7280                 if (to_move == length) {
7281                         /* All of it fits in the MTU */
7282                         if (sp->some_taken) {
7283                                 rcv_flags |= SCTP_DATA_LAST_FRAG;
7284                         } else {
7285                                 rcv_flags |= SCTP_DATA_NOT_FRAG;
7286                         }
7287                         sp->put_last_out = 1;
7288                         if (sp->sinfo_flags & SCTP_SACK_IMMEDIATELY) {
7289                                 rcv_flags |= SCTP_DATA_SACK_IMMEDIATELY;
7290                         }
7291                 } else {
7292                         /* Not all of it fits, we fragment */
7293                         if (sp->some_taken == 0) {
7294                                 rcv_flags |= SCTP_DATA_FIRST_FRAG;
7295                         }
7296                         sp->some_taken = 1;
7297                 }
7298         } else {
7299                 to_move = sctp_can_we_split_this(stcb, length, space_left, frag_point, eeor_mode);
7300                 if (to_move) {
7301                         /*-
7302                          * We use a snapshot of length in case it
7303                          * is expanding during the compare.
7304                          */
7305                         uint32_t llen;
7306
7307                         llen = length;
7308                         if (to_move >= llen) {
7309                                 to_move = llen;
7310                                 if (send_lock_up == 0) {
7311                                         /*-
7312                                          * We are taking all of an incomplete msg
7313                                          * thus we need a send lock.
7314                                          */
7315                                         SCTP_TCB_SEND_LOCK(stcb);
7316                                         send_lock_up = 1;
7317                                         if (sp->msg_is_complete) {
7318                                                 /*
7319                                                  * the sender finished the
7320                                                  * msg
7321                                                  */
7322                                                 goto re_look;
7323                                         }
7324                                 }
7325                         }
7326                         if (sp->some_taken == 0) {
7327                                 rcv_flags |= SCTP_DATA_FIRST_FRAG;
7328                                 sp->some_taken = 1;
7329                         }
7330                 } else {
7331                         /* Nothing to take. */
7332                         *giveup = 1;
7333                         to_move = 0;
7334                         goto out_of;
7335                 }
7336         }
7337
7338         /* If we reach here, we can copy out a chunk */
7339         sctp_alloc_a_chunk(stcb, chk);
7340         if (chk == NULL) {
7341                 /* No chunk memory */
7342                 *giveup = 1;
7343                 to_move = 0;
7344                 goto out_of;
7345         }
7346         /*
7347          * Setup for unordered if needed by looking at the user sent info
7348          * flags.
7349          */
7350         if (sp->sinfo_flags & SCTP_UNORDERED) {
7351                 rcv_flags |= SCTP_DATA_UNORDERED;
7352         }
7353         if (SCTP_BASE_SYSCTL(sctp_enable_sack_immediately) &&
7354             (sp->sinfo_flags & SCTP_EOF) == SCTP_EOF) {
7355                 rcv_flags |= SCTP_DATA_SACK_IMMEDIATELY;
7356         }
7357         /* clear out the chunk before setting up */
7358         memset(chk, 0, sizeof(*chk));
7359         chk->rec.data.rcv_flags = rcv_flags;
7360
7361         if (to_move >= length) {
7362                 /* we think we can steal the whole thing */
7363                 if ((sp->sender_all_done == 0) && (send_lock_up == 0)) {
7364                         SCTP_TCB_SEND_LOCK(stcb);
7365                         send_lock_up = 1;
7366                 }
7367                 if (to_move < sp->length) {
7368                         /* bail, it changed */
7369                         goto dont_do_it;
7370                 }
7371                 chk->data = sp->data;
7372                 chk->last_mbuf = sp->tail_mbuf;
7373                 /* register the stealing */
7374                 sp->data = sp->tail_mbuf = NULL;
7375         } else {
7376                 struct mbuf *m;
7377
7378 dont_do_it:
7379                 chk->data = SCTP_M_COPYM(sp->data, 0, to_move, M_NOWAIT);
7380                 chk->last_mbuf = NULL;
7381                 if (chk->data == NULL) {
7382                         sp->some_taken = some_taken;
7383                         sctp_free_a_chunk(stcb, chk, so_locked);
7384                         *bail = 1;
7385                         to_move = 0;
7386                         goto out_of;
7387                 }
7388 #ifdef SCTP_MBUF_LOGGING
7389                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
7390                         sctp_log_mbc(chk->data, SCTP_MBUF_ICOPY);
7391                 }
7392 #endif
7393                 /* Pull off the data */
7394                 m_adj(sp->data, to_move);
7395                 /* Now lets work our way down and compact it */
7396                 m = sp->data;
7397                 while (m && (SCTP_BUF_LEN(m) == 0)) {
7398                         sp->data = SCTP_BUF_NEXT(m);
7399                         SCTP_BUF_NEXT(m) = NULL;
7400                         if (sp->tail_mbuf == m) {
7401                                 /*-
7402                                  * Freeing tail? TSNH since
7403                                  * we supposedly were taking less
7404                                  * than the sp->length.
7405                                  */
7406 #ifdef INVARIANTS
7407                                 panic("Huh, freing tail? - TSNH");
7408 #else
7409                                 SCTP_PRINTF("Huh, freeing tail? - TSNH\n");
7410                                 sp->tail_mbuf = sp->data = NULL;
7411                                 sp->length = 0;
7412 #endif
7413
7414                         }
7415                         sctp_m_free(m);
7416                         m = sp->data;
7417                 }
7418         }
7419         if (SCTP_BUF_IS_EXTENDED(chk->data)) {
7420                 chk->copy_by_ref = 1;
7421         } else {
7422                 chk->copy_by_ref = 0;
7423         }
7424         /*
7425          * get last_mbuf and counts of mb usage This is ugly but hopefully
7426          * its only one mbuf.
7427          */
7428         if (chk->last_mbuf == NULL) {
7429                 chk->last_mbuf = chk->data;
7430                 while (SCTP_BUF_NEXT(chk->last_mbuf) != NULL) {
7431                         chk->last_mbuf = SCTP_BUF_NEXT(chk->last_mbuf);
7432                 }
7433         }
7434         if (to_move > length) {
7435                 /*- This should not happen either
7436                  * since we always lower to_move to the size
7437                  * of sp->length if its larger.
7438                  */
7439 #ifdef INVARIANTS
7440                 panic("Huh, how can to_move be larger?");
7441 #else
7442                 SCTP_PRINTF("Huh, how can to_move be larger?\n");
7443                 sp->length = 0;
7444 #endif
7445         } else {
7446                 atomic_subtract_int(&sp->length, to_move);
7447         }
7448         leading = SCTP_DATA_CHUNK_OVERHEAD(stcb);
7449         if (M_LEADINGSPACE(chk->data) < leading) {
7450                 /* Not enough room for a chunk header, get some */
7451                 struct mbuf *m;
7452
7453                 m = sctp_get_mbuf_for_msg(1, 0, M_NOWAIT, 0, MT_DATA);
7454                 if (m == NULL) {
7455                         /*
7456                          * we're in trouble here. _PREPEND below will free
7457                          * all the data if there is no leading space, so we
7458                          * must put the data back and restore.
7459                          */
7460                         if (send_lock_up == 0) {
7461                                 SCTP_TCB_SEND_LOCK(stcb);
7462                                 send_lock_up = 1;
7463                         }
7464                         if (sp->data == NULL) {
7465                                 /* unsteal the data */
7466                                 sp->data = chk->data;
7467                                 sp->tail_mbuf = chk->last_mbuf;
7468                         } else {
7469                                 struct mbuf *m_tmp;
7470
7471                                 /* reassemble the data */
7472                                 m_tmp = sp->data;
7473                                 sp->data = chk->data;
7474                                 SCTP_BUF_NEXT(chk->last_mbuf) = m_tmp;
7475                         }
7476                         sp->some_taken = some_taken;
7477                         atomic_add_int(&sp->length, to_move);
7478                         chk->data = NULL;
7479                         *bail = 1;
7480                         sctp_free_a_chunk(stcb, chk, so_locked);
7481                         to_move = 0;
7482                         goto out_of;
7483                 } else {
7484                         SCTP_BUF_LEN(m) = 0;
7485                         SCTP_BUF_NEXT(m) = chk->data;
7486                         chk->data = m;
7487                         M_ALIGN(chk->data, 4);
7488                 }
7489         }
7490         SCTP_BUF_PREPEND(chk->data, SCTP_DATA_CHUNK_OVERHEAD(stcb), M_NOWAIT);
7491         if (chk->data == NULL) {
7492                 /* HELP, TSNH since we assured it would not above? */
7493 #ifdef INVARIANTS
7494                 panic("prepend failes HELP?");
7495 #else
7496                 SCTP_PRINTF("prepend fails HELP?\n");
7497                 sctp_free_a_chunk(stcb, chk, so_locked);
7498 #endif
7499                 *bail = 1;
7500                 to_move = 0;
7501                 goto out_of;
7502         }
7503         sctp_snd_sb_alloc(stcb, SCTP_DATA_CHUNK_OVERHEAD(stcb));
7504         chk->book_size = chk->send_size = (uint16_t)(to_move + SCTP_DATA_CHUNK_OVERHEAD(stcb));
7505         chk->book_size_scale = 0;
7506         chk->sent = SCTP_DATAGRAM_UNSENT;
7507
7508         chk->flags = 0;
7509         chk->asoc = &stcb->asoc;
7510         chk->pad_inplace = 0;
7511         chk->no_fr_allowed = 0;
7512         if (stcb->asoc.idata_supported == 0) {
7513                 if (rcv_flags & SCTP_DATA_UNORDERED) {
7514                         /* Just use 0. The receiver ignores the values. */
7515                         chk->rec.data.mid = 0;
7516                 } else {
7517                         chk->rec.data.mid = strq->next_mid_ordered;
7518                         if (rcv_flags & SCTP_DATA_LAST_FRAG) {
7519                                 strq->next_mid_ordered++;
7520                         }
7521                 }
7522         } else {
7523                 if (rcv_flags & SCTP_DATA_UNORDERED) {
7524                         chk->rec.data.mid = strq->next_mid_unordered;
7525                         if (rcv_flags & SCTP_DATA_LAST_FRAG) {
7526                                 strq->next_mid_unordered++;
7527                         }
7528                 } else {
7529                         chk->rec.data.mid = strq->next_mid_ordered;
7530                         if (rcv_flags & SCTP_DATA_LAST_FRAG) {
7531                                 strq->next_mid_ordered++;
7532                         }
7533                 }
7534         }
7535         chk->rec.data.sid = sp->sid;
7536         chk->rec.data.ppid = sp->ppid;
7537         chk->rec.data.context = sp->context;
7538         chk->rec.data.doing_fast_retransmit = 0;
7539
7540         chk->rec.data.timetodrop = sp->ts;
7541         chk->flags = sp->act_flags;
7542
7543         if (sp->net) {
7544                 chk->whoTo = sp->net;
7545                 atomic_add_int(&chk->whoTo->ref_count, 1);
7546         } else
7547                 chk->whoTo = NULL;
7548
7549         if (sp->holds_key_ref) {
7550                 chk->auth_keyid = sp->auth_keyid;
7551                 sctp_auth_key_acquire(stcb, chk->auth_keyid);
7552                 chk->holds_key_ref = 1;
7553         }
7554         chk->rec.data.tsn = atomic_fetchadd_int(&asoc->sending_seq, 1);
7555         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_AT_SEND_2_OUTQ) {
7556                 sctp_misc_ints(SCTP_STRMOUT_LOG_SEND,
7557                     (uint32_t)(uintptr_t)stcb, sp->length,
7558                     (uint32_t)((chk->rec.data.sid << 16) | (0x0000ffff & chk->rec.data.mid)),
7559                     chk->rec.data.tsn);
7560         }
7561         if (stcb->asoc.idata_supported == 0) {
7562                 dchkh = mtod(chk->data, struct sctp_data_chunk *);
7563         } else {
7564                 ndchkh = mtod(chk->data, struct sctp_idata_chunk *);
7565         }
7566         /*
7567          * Put the rest of the things in place now. Size was done earlier in
7568          * previous loop prior to padding.
7569          */
7570
7571 #ifdef SCTP_ASOCLOG_OF_TSNS
7572         SCTP_TCB_LOCK_ASSERT(stcb);
7573         if (asoc->tsn_out_at >= SCTP_TSN_LOG_SIZE) {
7574                 asoc->tsn_out_at = 0;
7575                 asoc->tsn_out_wrapped = 1;
7576         }
7577         asoc->out_tsnlog[asoc->tsn_out_at].tsn = chk->rec.data.tsn;
7578         asoc->out_tsnlog[asoc->tsn_out_at].strm = chk->rec.data.sid;
7579         asoc->out_tsnlog[asoc->tsn_out_at].seq = chk->rec.data.mid;
7580         asoc->out_tsnlog[asoc->tsn_out_at].sz = chk->send_size;
7581         asoc->out_tsnlog[asoc->tsn_out_at].flgs = chk->rec.data.rcv_flags;
7582         asoc->out_tsnlog[asoc->tsn_out_at].stcb = (void *)stcb;
7583         asoc->out_tsnlog[asoc->tsn_out_at].in_pos = asoc->tsn_out_at;
7584         asoc->out_tsnlog[asoc->tsn_out_at].in_out = 2;
7585         asoc->tsn_out_at++;
7586 #endif
7587         if (stcb->asoc.idata_supported == 0) {
7588                 dchkh->ch.chunk_type = SCTP_DATA;
7589                 dchkh->ch.chunk_flags = chk->rec.data.rcv_flags;
7590                 dchkh->dp.tsn = htonl(chk->rec.data.tsn);
7591                 dchkh->dp.sid = htons(strq->sid);
7592                 dchkh->dp.ssn = htons((uint16_t)chk->rec.data.mid);
7593                 dchkh->dp.ppid = chk->rec.data.ppid;
7594                 dchkh->ch.chunk_length = htons(chk->send_size);
7595         } else {
7596                 ndchkh->ch.chunk_type = SCTP_IDATA;
7597                 ndchkh->ch.chunk_flags = chk->rec.data.rcv_flags;
7598                 ndchkh->dp.tsn = htonl(chk->rec.data.tsn);
7599                 ndchkh->dp.sid = htons(strq->sid);
7600                 ndchkh->dp.reserved = htons(0);
7601                 ndchkh->dp.mid = htonl(chk->rec.data.mid);
7602                 if (sp->fsn == 0)
7603                         ndchkh->dp.ppid_fsn.ppid = chk->rec.data.ppid;
7604                 else
7605                         ndchkh->dp.ppid_fsn.fsn = htonl(sp->fsn);
7606                 sp->fsn++;
7607                 ndchkh->ch.chunk_length = htons(chk->send_size);
7608         }
7609         /* Now advance the chk->send_size by the actual pad needed. */
7610         if (chk->send_size < SCTP_SIZE32(chk->book_size)) {
7611                 /* need a pad */
7612                 struct mbuf *lm;
7613                 int pads;
7614
7615                 pads = SCTP_SIZE32(chk->book_size) - chk->send_size;
7616                 lm = sctp_pad_lastmbuf(chk->data, pads, chk->last_mbuf);
7617                 if (lm != NULL) {
7618                         chk->last_mbuf = lm;
7619                         chk->pad_inplace = 1;
7620                 }
7621                 chk->send_size += pads;
7622         }
7623         if (PR_SCTP_ENABLED(chk->flags)) {
7624                 asoc->pr_sctp_cnt++;
7625         }
7626         if (sp->msg_is_complete && (sp->length == 0) && (sp->sender_all_done)) {
7627                 /* All done pull and kill the message */
7628                 if (sp->put_last_out == 0) {
7629                         SCTP_PRINTF("Gak, put out entire msg with NO end!-2\n");
7630                         SCTP_PRINTF("sender_done:%d len:%d msg_comp:%d put_last_out:%d send_lock:%d\n",
7631                             sp->sender_all_done,
7632                             sp->length,
7633                             sp->msg_is_complete,
7634                             sp->put_last_out,
7635                             send_lock_up);
7636                 }
7637                 if ((send_lock_up == 0) && (TAILQ_NEXT(sp, next) == NULL)) {
7638                         SCTP_TCB_SEND_LOCK(stcb);
7639                         send_lock_up = 1;
7640                 }
7641                 atomic_subtract_int(&asoc->stream_queue_cnt, 1);
7642                 TAILQ_REMOVE(&strq->outqueue, sp, next);
7643                 stcb->asoc.ss_functions.sctp_ss_remove_from_stream(stcb, asoc, strq, sp, send_lock_up);
7644                 if ((strq->state == SCTP_STREAM_RESET_PENDING) &&
7645                     (strq->chunks_on_queues == 0) &&
7646                     TAILQ_EMPTY(&strq->outqueue)) {
7647                         stcb->asoc.trigger_reset = 1;
7648                 }
7649                 if (sp->net) {
7650                         sctp_free_remote_addr(sp->net);
7651                         sp->net = NULL;
7652                 }
7653                 if (sp->data) {
7654                         sctp_m_freem(sp->data);
7655                         sp->data = NULL;
7656                 }
7657                 sctp_free_a_strmoq(stcb, sp, so_locked);
7658         }
7659         asoc->chunks_on_out_queue++;
7660         strq->chunks_on_queues++;
7661         TAILQ_INSERT_TAIL(&asoc->send_queue, chk, sctp_next);
7662         asoc->send_queue_cnt++;
7663 out_of:
7664         if (send_lock_up) {
7665                 SCTP_TCB_SEND_UNLOCK(stcb);
7666         }
7667         return (to_move);
7668 }
7669
7670
7671 static void
7672 sctp_fill_outqueue(struct sctp_tcb *stcb,
7673     struct sctp_nets *net, int frag_point, int eeor_mode, int *quit_now, int so_locked
7674 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
7675     SCTP_UNUSED
7676 #endif
7677 )
7678 {
7679         struct sctp_association *asoc;
7680         struct sctp_stream_out *strq;
7681         uint32_t space_left, moved, total_moved;
7682         int bail, giveup;
7683
7684         SCTP_TCB_LOCK_ASSERT(stcb);
7685         asoc = &stcb->asoc;
7686         total_moved = 0;
7687         switch (net->ro._l_addr.sa.sa_family) {
7688 #ifdef INET
7689         case AF_INET:
7690                 space_left = net->mtu - SCTP_MIN_V4_OVERHEAD;
7691                 break;
7692 #endif
7693 #ifdef INET6
7694         case AF_INET6:
7695                 space_left = net->mtu - SCTP_MIN_OVERHEAD;
7696                 break;
7697 #endif
7698         default:
7699                 /* TSNH */
7700                 space_left = net->mtu;
7701                 break;
7702         }
7703         /* Need an allowance for the data chunk header too */
7704         space_left -= SCTP_DATA_CHUNK_OVERHEAD(stcb);
7705
7706         /* must make even word boundary */
7707         space_left &= 0xfffffffc;
7708         strq = stcb->asoc.ss_functions.sctp_ss_select_stream(stcb, net, asoc);
7709         giveup = 0;
7710         bail = 0;
7711         while ((space_left > 0) && (strq != NULL)) {
7712                 moved = sctp_move_to_outqueue(stcb, strq, space_left, frag_point,
7713                     &giveup, eeor_mode, &bail, so_locked);
7714                 stcb->asoc.ss_functions.sctp_ss_scheduled(stcb, net, asoc, strq, moved);
7715                 if ((giveup != 0) || (bail != 0)) {
7716                         break;
7717                 }
7718                 strq = stcb->asoc.ss_functions.sctp_ss_select_stream(stcb, net, asoc);
7719                 total_moved += moved;
7720                 space_left -= moved;
7721                 if (space_left >= SCTP_DATA_CHUNK_OVERHEAD(stcb)) {
7722                         space_left -= SCTP_DATA_CHUNK_OVERHEAD(stcb);
7723                 } else {
7724                         space_left = 0;
7725                 }
7726                 space_left &= 0xfffffffc;
7727         }
7728         if (bail != 0)
7729                 *quit_now = 1;
7730
7731         stcb->asoc.ss_functions.sctp_ss_packet_done(stcb, net, asoc);
7732
7733         if (total_moved == 0) {
7734                 if ((stcb->asoc.sctp_cmt_on_off == 0) &&
7735                     (net == stcb->asoc.primary_destination)) {
7736                         /* ran dry for primary network net */
7737                         SCTP_STAT_INCR(sctps_primary_randry);
7738                 } else if (stcb->asoc.sctp_cmt_on_off > 0) {
7739                         /* ran dry with CMT on */
7740                         SCTP_STAT_INCR(sctps_cmt_randry);
7741                 }
7742         }
7743 }
7744
7745 void
7746 sctp_fix_ecn_echo(struct sctp_association *asoc)
7747 {
7748         struct sctp_tmit_chunk *chk;
7749
7750         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
7751                 if (chk->rec.chunk_id.id == SCTP_ECN_ECHO) {
7752                         chk->sent = SCTP_DATAGRAM_UNSENT;
7753                 }
7754         }
7755 }
7756
7757 void
7758 sctp_move_chunks_from_net(struct sctp_tcb *stcb, struct sctp_nets *net)
7759 {
7760         struct sctp_association *asoc;
7761         struct sctp_tmit_chunk *chk;
7762         struct sctp_stream_queue_pending *sp;
7763         unsigned int i;
7764
7765         if (net == NULL) {
7766                 return;
7767         }
7768         asoc = &stcb->asoc;
7769         for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
7770                 TAILQ_FOREACH(sp, &stcb->asoc.strmout[i].outqueue, next) {
7771                         if (sp->net == net) {
7772                                 sctp_free_remote_addr(sp->net);
7773                                 sp->net = NULL;
7774                         }
7775                 }
7776         }
7777         TAILQ_FOREACH(chk, &asoc->send_queue, sctp_next) {
7778                 if (chk->whoTo == net) {
7779                         sctp_free_remote_addr(chk->whoTo);
7780                         chk->whoTo = NULL;
7781                 }
7782         }
7783 }
7784
7785 int
7786 sctp_med_chunk_output(struct sctp_inpcb *inp,
7787     struct sctp_tcb *stcb,
7788     struct sctp_association *asoc,
7789     int *num_out,
7790     int *reason_code,
7791     int control_only, int from_where,
7792     struct timeval *now, int *now_filled, int frag_point, int so_locked
7793 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
7794     SCTP_UNUSED
7795 #endif
7796 )
7797 {
7798         /**
7799          * Ok this is the generic chunk service queue. we must do the
7800          * following:
7801          * - Service the stream queue that is next, moving any
7802          *   message (note I must get a complete message i.e. FIRST/MIDDLE and
7803          *   LAST to the out queue in one pass) and assigning TSN's. This
7804          *   only applys though if the peer does not support NDATA. For NDATA
7805          *   chunks its ok to not send the entire message ;-)
7806          * - Check to see if the cwnd/rwnd allows any output, if so we go ahead and
7807          *   fomulate and send the low level chunks. Making sure to combine
7808          *   any control in the control chunk queue also.
7809          */
7810         struct sctp_nets *net, *start_at, *sack_goes_to = NULL, *old_start_at = NULL;
7811         struct mbuf *outchain, *endoutchain;
7812         struct sctp_tmit_chunk *chk, *nchk;
7813
7814         /* temp arrays for unlinking */
7815         struct sctp_tmit_chunk *data_list[SCTP_MAX_DATA_BUNDLING];
7816         int no_fragmentflg, error;
7817         unsigned int max_rwnd_per_dest, max_send_per_dest;
7818         int one_chunk, hbflag, skip_data_for_this_net;
7819         int asconf, cookie, no_out_cnt;
7820         int bundle_at, ctl_cnt, no_data_chunks, eeor_mode;
7821         unsigned int mtu, r_mtu, omtu, mx_mtu, to_out;
7822         int tsns_sent = 0;
7823         uint32_t auth_offset = 0;
7824         struct sctp_auth_chunk *auth = NULL;
7825         uint16_t auth_keyid;
7826         int override_ok = 1;
7827         int skip_fill_up = 0;
7828         int data_auth_reqd = 0;
7829
7830         /*
7831          * JRS 5/14/07 - Add flag for whether a heartbeat is sent to the
7832          * destination.
7833          */
7834         int quit_now = 0;
7835
7836         *num_out = 0;
7837         *reason_code = 0;
7838         auth_keyid = stcb->asoc.authinfo.active_keyid;
7839         if ((asoc->state & SCTP_STATE_SHUTDOWN_PENDING) ||
7840             (asoc->state & SCTP_STATE_SHUTDOWN_RECEIVED) ||
7841             (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_EXPLICIT_EOR))) {
7842                 eeor_mode = 1;
7843         } else {
7844                 eeor_mode = 0;
7845         }
7846         ctl_cnt = no_out_cnt = asconf = cookie = 0;
7847         /*
7848          * First lets prime the pump. For each destination, if there is room
7849          * in the flight size, attempt to pull an MTU's worth out of the
7850          * stream queues into the general send_queue
7851          */
7852 #ifdef SCTP_AUDITING_ENABLED
7853         sctp_audit_log(0xC2, 2);
7854 #endif
7855         SCTP_TCB_LOCK_ASSERT(stcb);
7856         hbflag = 0;
7857         if (control_only)
7858                 no_data_chunks = 1;
7859         else
7860                 no_data_chunks = 0;
7861
7862         /* Nothing to possible to send? */
7863         if ((TAILQ_EMPTY(&asoc->control_send_queue) ||
7864             (asoc->ctrl_queue_cnt == stcb->asoc.ecn_echo_cnt_onq)) &&
7865             TAILQ_EMPTY(&asoc->asconf_send_queue) &&
7866             TAILQ_EMPTY(&asoc->send_queue) &&
7867             sctp_is_there_unsent_data(stcb, so_locked) == 0) {
7868 nothing_to_send:
7869                 *reason_code = 9;
7870                 return (0);
7871         }
7872         if (asoc->peers_rwnd == 0) {
7873                 /* No room in peers rwnd */
7874                 *reason_code = 1;
7875                 if (asoc->total_flight > 0) {
7876                         /* we are allowed one chunk in flight */
7877                         no_data_chunks = 1;
7878                 }
7879         }
7880         if (stcb->asoc.ecn_echo_cnt_onq) {
7881                 /* Record where a sack goes, if any */
7882                 if (no_data_chunks &&
7883                     (asoc->ctrl_queue_cnt == stcb->asoc.ecn_echo_cnt_onq)) {
7884                         /* Nothing but ECNe to send - we don't do that */
7885                         goto nothing_to_send;
7886                 }
7887                 TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
7888                         if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
7889                             (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK)) {
7890                                 sack_goes_to = chk->whoTo;
7891                                 break;
7892                         }
7893                 }
7894         }
7895         max_rwnd_per_dest = ((asoc->peers_rwnd + asoc->total_flight) / asoc->numnets);
7896         if (stcb->sctp_socket)
7897                 max_send_per_dest = SCTP_SB_LIMIT_SND(stcb->sctp_socket) / asoc->numnets;
7898         else
7899                 max_send_per_dest = 0;
7900         if (no_data_chunks == 0) {
7901                 /* How many non-directed chunks are there? */
7902                 TAILQ_FOREACH(chk, &asoc->send_queue, sctp_next) {
7903                         if (chk->whoTo == NULL) {
7904                                 /*
7905                                  * We already have non-directed chunks on
7906                                  * the queue, no need to do a fill-up.
7907                                  */
7908                                 skip_fill_up = 1;
7909                                 break;
7910                         }
7911                 }
7912
7913         }
7914         if ((no_data_chunks == 0) &&
7915             (skip_fill_up == 0) &&
7916             (!stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc))) {
7917                 TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
7918                         /*
7919                          * This for loop we are in takes in each net, if
7920                          * its's got space in cwnd and has data sent to it
7921                          * (when CMT is off) then it calls
7922                          * sctp_fill_outqueue for the net. This gets data on
7923                          * the send queue for that network.
7924                          *
7925                          * In sctp_fill_outqueue TSN's are assigned and data
7926                          * is copied out of the stream buffers. Note mostly
7927                          * copy by reference (we hope).
7928                          */
7929                         net->window_probe = 0;
7930                         if ((net != stcb->asoc.alternate) &&
7931                             ((net->dest_state & SCTP_ADDR_PF) ||
7932                             (!(net->dest_state & SCTP_ADDR_REACHABLE)) ||
7933                             (net->dest_state & SCTP_ADDR_UNCONFIRMED))) {
7934                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
7935                                         sctp_log_cwnd(stcb, net, 1,
7936                                             SCTP_CWND_LOG_FILL_OUTQ_CALLED);
7937                                 }
7938                                 continue;
7939                         }
7940                         if ((stcb->asoc.cc_functions.sctp_cwnd_new_transmission_begins) &&
7941                             (net->flight_size == 0)) {
7942                                 (*stcb->asoc.cc_functions.sctp_cwnd_new_transmission_begins) (stcb, net);
7943                         }
7944                         if (net->flight_size >= net->cwnd) {
7945                                 /* skip this network, no room - can't fill */
7946                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
7947                                         sctp_log_cwnd(stcb, net, 3,
7948                                             SCTP_CWND_LOG_FILL_OUTQ_CALLED);
7949                                 }
7950                                 continue;
7951                         }
7952                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
7953                                 sctp_log_cwnd(stcb, net, 4, SCTP_CWND_LOG_FILL_OUTQ_CALLED);
7954                         }
7955                         sctp_fill_outqueue(stcb, net, frag_point, eeor_mode, &quit_now, so_locked);
7956                         if (quit_now) {
7957                                 /* memory alloc failure */
7958                                 no_data_chunks = 1;
7959                                 break;
7960                         }
7961                 }
7962         }
7963         /* now service each destination and send out what we can for it */
7964         /* Nothing to send? */
7965         if (TAILQ_EMPTY(&asoc->control_send_queue) &&
7966             TAILQ_EMPTY(&asoc->asconf_send_queue) &&
7967             TAILQ_EMPTY(&asoc->send_queue)) {
7968                 *reason_code = 8;
7969                 return (0);
7970         }
7971         if (asoc->sctp_cmt_on_off > 0) {
7972                 /* get the last start point */
7973                 start_at = asoc->last_net_cmt_send_started;
7974                 if (start_at == NULL) {
7975                         /* null so to beginning */
7976                         start_at = TAILQ_FIRST(&asoc->nets);
7977                 } else {
7978                         start_at = TAILQ_NEXT(asoc->last_net_cmt_send_started, sctp_next);
7979                         if (start_at == NULL) {
7980                                 start_at = TAILQ_FIRST(&asoc->nets);
7981                         }
7982                 }
7983                 asoc->last_net_cmt_send_started = start_at;
7984         } else {
7985                 start_at = TAILQ_FIRST(&asoc->nets);
7986         }
7987         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
7988                 if (chk->whoTo == NULL) {
7989                         if (asoc->alternate) {
7990                                 chk->whoTo = asoc->alternate;
7991                         } else {
7992                                 chk->whoTo = asoc->primary_destination;
7993                         }
7994                         atomic_add_int(&chk->whoTo->ref_count, 1);
7995                 }
7996         }
7997         old_start_at = NULL;
7998 again_one_more_time:
7999         for (net = start_at; net != NULL; net = TAILQ_NEXT(net, sctp_next)) {
8000                 /* how much can we send? */
8001                 /* SCTPDBG("Examine for sending net:%x\n", (uint32_t)net); */
8002                 if (old_start_at && (old_start_at == net)) {
8003                         /* through list ocmpletely. */
8004                         break;
8005                 }
8006                 tsns_sent = 0xa;
8007                 if (TAILQ_EMPTY(&asoc->control_send_queue) &&
8008                     TAILQ_EMPTY(&asoc->asconf_send_queue) &&
8009                     (net->flight_size >= net->cwnd)) {
8010                         /*
8011                          * Nothing on control or asconf and flight is full,
8012                          * we can skip even in the CMT case.
8013                          */
8014                         continue;
8015                 }
8016                 bundle_at = 0;
8017                 endoutchain = outchain = NULL;
8018                 no_fragmentflg = 1;
8019                 one_chunk = 0;
8020                 if (net->dest_state & SCTP_ADDR_UNCONFIRMED) {
8021                         skip_data_for_this_net = 1;
8022                 } else {
8023                         skip_data_for_this_net = 0;
8024                 }
8025                 switch (((struct sockaddr *)&net->ro._l_addr)->sa_family) {
8026 #ifdef INET
8027                 case AF_INET:
8028                         mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
8029                         break;
8030 #endif
8031 #ifdef INET6
8032                 case AF_INET6:
8033                         mtu = net->mtu - SCTP_MIN_OVERHEAD;
8034                         break;
8035 #endif
8036                 default:
8037                         /* TSNH */
8038                         mtu = net->mtu;
8039                         break;
8040                 }
8041                 mx_mtu = mtu;
8042                 to_out = 0;
8043                 if (mtu > asoc->peers_rwnd) {
8044                         if (asoc->total_flight > 0) {
8045                                 /* We have a packet in flight somewhere */
8046                                 r_mtu = asoc->peers_rwnd;
8047                         } else {
8048                                 /* We are always allowed to send one MTU out */
8049                                 one_chunk = 1;
8050                                 r_mtu = mtu;
8051                         }
8052                 } else {
8053                         r_mtu = mtu;
8054                 }
8055                 error = 0;
8056                 /************************/
8057                 /* ASCONF transmission */
8058                 /************************/
8059                 /* Now first lets go through the asconf queue */
8060                 TAILQ_FOREACH_SAFE(chk, &asoc->asconf_send_queue, sctp_next, nchk) {
8061                         if (chk->rec.chunk_id.id != SCTP_ASCONF) {
8062                                 continue;
8063                         }
8064                         if (chk->whoTo == NULL) {
8065                                 if (asoc->alternate == NULL) {
8066                                         if (asoc->primary_destination != net) {
8067                                                 break;
8068                                         }
8069                                 } else {
8070                                         if (asoc->alternate != net) {
8071                                                 break;
8072                                         }
8073                                 }
8074                         } else {
8075                                 if (chk->whoTo != net) {
8076                                         break;
8077                                 }
8078                         }
8079                         if (chk->data == NULL) {
8080                                 break;
8081                         }
8082                         if (chk->sent != SCTP_DATAGRAM_UNSENT &&
8083                             chk->sent != SCTP_DATAGRAM_RESEND) {
8084                                 break;
8085                         }
8086                         /*
8087                          * if no AUTH is yet included and this chunk
8088                          * requires it, make sure to account for it.  We
8089                          * don't apply the size until the AUTH chunk is
8090                          * actually added below in case there is no room for
8091                          * this chunk. NOTE: we overload the use of "omtu"
8092                          * here
8093                          */
8094                         if ((auth == NULL) &&
8095                             sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
8096                             stcb->asoc.peer_auth_chunks)) {
8097                                 omtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
8098                         } else
8099                                 omtu = 0;
8100                         /* Here we do NOT factor the r_mtu */
8101                         if ((chk->send_size < (int)(mtu - omtu)) ||
8102                             (chk->flags & CHUNK_FLAGS_FRAGMENT_OK)) {
8103                                 /*
8104                                  * We probably should glom the mbuf chain
8105                                  * from the chk->data for control but the
8106                                  * problem is it becomes yet one more level
8107                                  * of tracking to do if for some reason
8108                                  * output fails. Then I have got to
8109                                  * reconstruct the merged control chain.. el
8110                                  * yucko.. for now we take the easy way and
8111                                  * do the copy
8112                                  */
8113                                 /*
8114                                  * Add an AUTH chunk, if chunk requires it
8115                                  * save the offset into the chain for AUTH
8116                                  */
8117                                 if ((auth == NULL) &&
8118                                     (sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
8119                                     stcb->asoc.peer_auth_chunks))) {
8120                                         outchain = sctp_add_auth_chunk(outchain,
8121                                             &endoutchain,
8122                                             &auth,
8123                                             &auth_offset,
8124                                             stcb,
8125                                             chk->rec.chunk_id.id);
8126                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8127                                 }
8128                                 outchain = sctp_copy_mbufchain(chk->data, outchain, &endoutchain,
8129                                     (int)chk->rec.chunk_id.can_take_data,
8130                                     chk->send_size, chk->copy_by_ref);
8131                                 if (outchain == NULL) {
8132                                         *reason_code = 8;
8133                                         SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
8134                                         return (ENOMEM);
8135                                 }
8136                                 SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8137                                 /* update our MTU size */
8138                                 if (mtu > (chk->send_size + omtu))
8139                                         mtu -= (chk->send_size + omtu);
8140                                 else
8141                                         mtu = 0;
8142                                 to_out += (chk->send_size + omtu);
8143                                 /* Do clear IP_DF ? */
8144                                 if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
8145                                         no_fragmentflg = 0;
8146                                 }
8147                                 if (chk->rec.chunk_id.can_take_data)
8148                                         chk->data = NULL;
8149                                 /*
8150                                  * set hb flag since we can use these for
8151                                  * RTO
8152                                  */
8153                                 hbflag = 1;
8154                                 asconf = 1;
8155                                 /*
8156                                  * should sysctl this: don't bundle data
8157                                  * with ASCONF since it requires AUTH
8158                                  */
8159                                 no_data_chunks = 1;
8160                                 chk->sent = SCTP_DATAGRAM_SENT;
8161                                 if (chk->whoTo == NULL) {
8162                                         chk->whoTo = net;
8163                                         atomic_add_int(&net->ref_count, 1);
8164                                 }
8165                                 chk->snd_count++;
8166                                 if (mtu == 0) {
8167                                         /*
8168                                          * Ok we are out of room but we can
8169                                          * output without effecting the
8170                                          * flight size since this little guy
8171                                          * is a control only packet.
8172                                          */
8173                                         sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp, stcb, net);
8174                                         /*
8175                                          * do NOT clear the asconf flag as
8176                                          * it is used to do appropriate
8177                                          * source address selection.
8178                                          */
8179                                         if (*now_filled == 0) {
8180                                                 (void)SCTP_GETTIME_TIMEVAL(now);
8181                                                 *now_filled = 1;
8182                                         }
8183                                         net->last_sent_time = *now;
8184                                         hbflag = 0;
8185                                         if ((error = sctp_lowlevel_chunk_output(inp, stcb, net,
8186                                             (struct sockaddr *)&net->ro._l_addr,
8187                                             outchain, auth_offset, auth,
8188                                             stcb->asoc.authinfo.active_keyid,
8189                                             no_fragmentflg, 0, asconf,
8190                                             inp->sctp_lport, stcb->rport,
8191                                             htonl(stcb->asoc.peer_vtag),
8192                                             net->port, NULL,
8193                                             0, 0,
8194                                             so_locked))) {
8195                                                 /*
8196                                                  * error, we could not
8197                                                  * output
8198                                                  */
8199                                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
8200                                                 if (from_where == 0) {
8201                                                         SCTP_STAT_INCR(sctps_lowlevelerrusr);
8202                                                 }
8203                                                 if (error == ENOBUFS) {
8204                                                         asoc->ifp_had_enobuf = 1;
8205                                                         SCTP_STAT_INCR(sctps_lowlevelerr);
8206                                                 }
8207                                                 /* error, could not output */
8208                                                 if (error == EHOSTUNREACH) {
8209                                                         /*
8210                                                          * Destination went
8211                                                          * unreachable
8212                                                          * during this send
8213                                                          */
8214                                                         sctp_move_chunks_from_net(stcb, net);
8215                                                 }
8216                                                 *reason_code = 7;
8217                                                 break;
8218                                         } else {
8219                                                 asoc->ifp_had_enobuf = 0;
8220                                         }
8221                                         /*
8222                                          * increase the number we sent, if a
8223                                          * cookie is sent we don't tell them
8224                                          * any was sent out.
8225                                          */
8226                                         outchain = endoutchain = NULL;
8227                                         auth = NULL;
8228                                         auth_offset = 0;
8229                                         if (!no_out_cnt)
8230                                                 *num_out += ctl_cnt;
8231                                         /* recalc a clean slate and setup */
8232                                         switch (net->ro._l_addr.sa.sa_family) {
8233 #ifdef INET
8234                                         case AF_INET:
8235                                                 mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
8236                                                 break;
8237 #endif
8238 #ifdef INET6
8239                                         case AF_INET6:
8240                                                 mtu = net->mtu - SCTP_MIN_OVERHEAD;
8241                                                 break;
8242 #endif
8243                                         default:
8244                                                 /* TSNH */
8245                                                 mtu = net->mtu;
8246                                                 break;
8247                                         }
8248                                         to_out = 0;
8249                                         no_fragmentflg = 1;
8250                                 }
8251                         }
8252                 }
8253                 if (error != 0) {
8254                         /* try next net */
8255                         continue;
8256                 }
8257                 /************************/
8258                 /* Control transmission */
8259                 /************************/
8260                 /* Now first lets go through the control queue */
8261                 TAILQ_FOREACH_SAFE(chk, &asoc->control_send_queue, sctp_next, nchk) {
8262                         if ((sack_goes_to) &&
8263                             (chk->rec.chunk_id.id == SCTP_ECN_ECHO) &&
8264                             (chk->whoTo != sack_goes_to)) {
8265                                 /*
8266                                  * if we have a sack in queue, and we are
8267                                  * looking at an ecn echo that is NOT queued
8268                                  * to where the sack is going..
8269                                  */
8270                                 if (chk->whoTo == net) {
8271                                         /*
8272                                          * Don't transmit it to where its
8273                                          * going (current net)
8274                                          */
8275                                         continue;
8276                                 } else if (sack_goes_to == net) {
8277                                         /*
8278                                          * But do transmit it to this
8279                                          * address
8280                                          */
8281                                         goto skip_net_check;
8282                                 }
8283                         }
8284                         if (chk->whoTo == NULL) {
8285                                 if (asoc->alternate == NULL) {
8286                                         if (asoc->primary_destination != net) {
8287                                                 continue;
8288                                         }
8289                                 } else {
8290                                         if (asoc->alternate != net) {
8291                                                 continue;
8292                                         }
8293                                 }
8294                         } else {
8295                                 if (chk->whoTo != net) {
8296                                         continue;
8297                                 }
8298                         }
8299         skip_net_check:
8300                         if (chk->data == NULL) {
8301                                 continue;
8302                         }
8303                         if (chk->sent != SCTP_DATAGRAM_UNSENT) {
8304                                 /*
8305                                  * It must be unsent. Cookies and ASCONF's
8306                                  * hang around but there timers will force
8307                                  * when marked for resend.
8308                                  */
8309                                 continue;
8310                         }
8311                         /*
8312                          * if no AUTH is yet included and this chunk
8313                          * requires it, make sure to account for it.  We
8314                          * don't apply the size until the AUTH chunk is
8315                          * actually added below in case there is no room for
8316                          * this chunk. NOTE: we overload the use of "omtu"
8317                          * here
8318                          */
8319                         if ((auth == NULL) &&
8320                             sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
8321                             stcb->asoc.peer_auth_chunks)) {
8322                                 omtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
8323                         } else
8324                                 omtu = 0;
8325                         /* Here we do NOT factor the r_mtu */
8326                         if ((chk->send_size <= (int)(mtu - omtu)) ||
8327                             (chk->flags & CHUNK_FLAGS_FRAGMENT_OK)) {
8328                                 /*
8329                                  * We probably should glom the mbuf chain
8330                                  * from the chk->data for control but the
8331                                  * problem is it becomes yet one more level
8332                                  * of tracking to do if for some reason
8333                                  * output fails. Then I have got to
8334                                  * reconstruct the merged control chain.. el
8335                                  * yucko.. for now we take the easy way and
8336                                  * do the copy
8337                                  */
8338                                 /*
8339                                  * Add an AUTH chunk, if chunk requires it
8340                                  * save the offset into the chain for AUTH
8341                                  */
8342                                 if ((auth == NULL) &&
8343                                     (sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
8344                                     stcb->asoc.peer_auth_chunks))) {
8345                                         outchain = sctp_add_auth_chunk(outchain,
8346                                             &endoutchain,
8347                                             &auth,
8348                                             &auth_offset,
8349                                             stcb,
8350                                             chk->rec.chunk_id.id);
8351                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8352                                 }
8353                                 outchain = sctp_copy_mbufchain(chk->data, outchain, &endoutchain,
8354                                     (int)chk->rec.chunk_id.can_take_data,
8355                                     chk->send_size, chk->copy_by_ref);
8356                                 if (outchain == NULL) {
8357                                         *reason_code = 8;
8358                                         SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
8359                                         return (ENOMEM);
8360                                 }
8361                                 SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8362                                 /* update our MTU size */
8363                                 if (mtu > (chk->send_size + omtu))
8364                                         mtu -= (chk->send_size + omtu);
8365                                 else
8366                                         mtu = 0;
8367                                 to_out += (chk->send_size + omtu);
8368                                 /* Do clear IP_DF ? */
8369                                 if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
8370                                         no_fragmentflg = 0;
8371                                 }
8372                                 if (chk->rec.chunk_id.can_take_data)
8373                                         chk->data = NULL;
8374                                 /* Mark things to be removed, if needed */
8375                                 if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
8376                                     (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK) ||  /* EY */
8377                                     (chk->rec.chunk_id.id == SCTP_HEARTBEAT_REQUEST) ||
8378                                     (chk->rec.chunk_id.id == SCTP_HEARTBEAT_ACK) ||
8379                                     (chk->rec.chunk_id.id == SCTP_SHUTDOWN) ||
8380                                     (chk->rec.chunk_id.id == SCTP_SHUTDOWN_ACK) ||
8381                                     (chk->rec.chunk_id.id == SCTP_OPERATION_ERROR) ||
8382                                     (chk->rec.chunk_id.id == SCTP_COOKIE_ACK) ||
8383                                     (chk->rec.chunk_id.id == SCTP_ECN_CWR) ||
8384                                     (chk->rec.chunk_id.id == SCTP_PACKET_DROPPED) ||
8385                                     (chk->rec.chunk_id.id == SCTP_ASCONF_ACK)) {
8386                                         if (chk->rec.chunk_id.id == SCTP_HEARTBEAT_REQUEST) {
8387                                                 hbflag = 1;
8388                                         }
8389                                         /* remove these chunks at the end */
8390                                         if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
8391                                             (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK)) {
8392                                                 /* turn off the timer */
8393                                                 if (SCTP_OS_TIMER_PENDING(&stcb->asoc.dack_timer.timer)) {
8394                                                         sctp_timer_stop(SCTP_TIMER_TYPE_RECV,
8395                                                             inp, stcb, net,
8396                                                             SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_1);
8397                                                 }
8398                                         }
8399                                         ctl_cnt++;
8400                                 } else {
8401                                         /*
8402                                          * Other chunks, since they have
8403                                          * timers running (i.e. COOKIE) we
8404                                          * just "trust" that it gets sent or
8405                                          * retransmitted.
8406                                          */
8407                                         ctl_cnt++;
8408                                         if (chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
8409                                                 cookie = 1;
8410                                                 no_out_cnt = 1;
8411                                         } else if (chk->rec.chunk_id.id == SCTP_ECN_ECHO) {
8412                                                 /*
8413                                                  * Increment ecne send count
8414                                                  * here this means we may be
8415                                                  * over-zealous in our
8416                                                  * counting if the send
8417                                                  * fails, but its the best
8418                                                  * place to do it (we used
8419                                                  * to do it in the queue of
8420                                                  * the chunk, but that did
8421                                                  * not tell how many times
8422                                                  * it was sent.
8423                                                  */
8424                                                 SCTP_STAT_INCR(sctps_sendecne);
8425                                         }
8426                                         chk->sent = SCTP_DATAGRAM_SENT;
8427                                         if (chk->whoTo == NULL) {
8428                                                 chk->whoTo = net;
8429                                                 atomic_add_int(&net->ref_count, 1);
8430                                         }
8431                                         chk->snd_count++;
8432                                 }
8433                                 if (mtu == 0) {
8434                                         /*
8435                                          * Ok we are out of room but we can
8436                                          * output without effecting the
8437                                          * flight size since this little guy
8438                                          * is a control only packet.
8439                                          */
8440                                         if (asconf) {
8441                                                 sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp, stcb, net);
8442                                                 /*
8443                                                  * do NOT clear the asconf
8444                                                  * flag as it is used to do
8445                                                  * appropriate source
8446                                                  * address selection.
8447                                                  */
8448                                         }
8449                                         if (cookie) {
8450                                                 sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, inp, stcb, net);
8451                                                 cookie = 0;
8452                                         }
8453                                         /* Only HB or ASCONF advances time */
8454                                         if (hbflag) {
8455                                                 if (*now_filled == 0) {
8456                                                         (void)SCTP_GETTIME_TIMEVAL(now);
8457                                                         *now_filled = 1;
8458                                                 }
8459                                                 net->last_sent_time = *now;
8460                                                 hbflag = 0;
8461                                         }
8462                                         if ((error = sctp_lowlevel_chunk_output(inp, stcb, net,
8463                                             (struct sockaddr *)&net->ro._l_addr,
8464                                             outchain,
8465                                             auth_offset, auth,
8466                                             stcb->asoc.authinfo.active_keyid,
8467                                             no_fragmentflg, 0, asconf,
8468                                             inp->sctp_lport, stcb->rport,
8469                                             htonl(stcb->asoc.peer_vtag),
8470                                             net->port, NULL,
8471                                             0, 0,
8472                                             so_locked))) {
8473                                                 /*
8474                                                  * error, we could not
8475                                                  * output
8476                                                  */
8477                                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
8478                                                 if (from_where == 0) {
8479                                                         SCTP_STAT_INCR(sctps_lowlevelerrusr);
8480                                                 }
8481                                                 if (error == ENOBUFS) {
8482                                                         asoc->ifp_had_enobuf = 1;
8483                                                         SCTP_STAT_INCR(sctps_lowlevelerr);
8484                                                 }
8485                                                 if (error == EHOSTUNREACH) {
8486                                                         /*
8487                                                          * Destination went
8488                                                          * unreachable
8489                                                          * during this send
8490                                                          */
8491                                                         sctp_move_chunks_from_net(stcb, net);
8492                                                 }
8493                                                 *reason_code = 7;
8494                                                 break;
8495                                         } else {
8496                                                 asoc->ifp_had_enobuf = 0;
8497                                         }
8498                                         /*
8499                                          * increase the number we sent, if a
8500                                          * cookie is sent we don't tell them
8501                                          * any was sent out.
8502                                          */
8503                                         outchain = endoutchain = NULL;
8504                                         auth = NULL;
8505                                         auth_offset = 0;
8506                                         if (!no_out_cnt)
8507                                                 *num_out += ctl_cnt;
8508                                         /* recalc a clean slate and setup */
8509                                         switch (net->ro._l_addr.sa.sa_family) {
8510 #ifdef INET
8511                                         case AF_INET:
8512                                                 mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
8513                                                 break;
8514 #endif
8515 #ifdef INET6
8516                                         case AF_INET6:
8517                                                 mtu = net->mtu - SCTP_MIN_OVERHEAD;
8518                                                 break;
8519 #endif
8520                                         default:
8521                                                 /* TSNH */
8522                                                 mtu = net->mtu;
8523                                                 break;
8524                                         }
8525                                         to_out = 0;
8526                                         no_fragmentflg = 1;
8527                                 }
8528                         }
8529                 }
8530                 if (error != 0) {
8531                         /* try next net */
8532                         continue;
8533                 }
8534                 /* JRI: if dest is in PF state, do not send data to it */
8535                 if ((asoc->sctp_cmt_on_off > 0) &&
8536                     (net != stcb->asoc.alternate) &&
8537                     (net->dest_state & SCTP_ADDR_PF)) {
8538                         goto no_data_fill;
8539                 }
8540                 if (net->flight_size >= net->cwnd) {
8541                         goto no_data_fill;
8542                 }
8543                 if ((asoc->sctp_cmt_on_off > 0) &&
8544                     (SCTP_BASE_SYSCTL(sctp_buffer_splitting) & SCTP_RECV_BUFFER_SPLITTING) &&
8545                     (net->flight_size > max_rwnd_per_dest)) {
8546                         goto no_data_fill;
8547                 }
8548                 /*
8549                  * We need a specific accounting for the usage of the send
8550                  * buffer. We also need to check the number of messages per
8551                  * net. For now, this is better than nothing and it disabled
8552                  * by default...
8553                  */
8554                 if ((asoc->sctp_cmt_on_off > 0) &&
8555                     (SCTP_BASE_SYSCTL(sctp_buffer_splitting) & SCTP_SEND_BUFFER_SPLITTING) &&
8556                     (max_send_per_dest > 0) &&
8557                     (net->flight_size > max_send_per_dest)) {
8558                         goto no_data_fill;
8559                 }
8560                 /*********************/
8561                 /* Data transmission */
8562                 /*********************/
8563                 /*
8564                  * if AUTH for DATA is required and no AUTH has been added
8565                  * yet, account for this in the mtu now... if no data can be
8566                  * bundled, this adjustment won't matter anyways since the
8567                  * packet will be going out...
8568                  */
8569                 data_auth_reqd = sctp_auth_is_required_chunk(SCTP_DATA,
8570                     stcb->asoc.peer_auth_chunks);
8571                 if (data_auth_reqd && (auth == NULL)) {
8572                         mtu -= sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
8573                 }
8574                 /* now lets add any data within the MTU constraints */
8575                 switch (((struct sockaddr *)&net->ro._l_addr)->sa_family) {
8576 #ifdef INET
8577                 case AF_INET:
8578                         if (net->mtu > SCTP_MIN_V4_OVERHEAD)
8579                                 omtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
8580                         else
8581                                 omtu = 0;
8582                         break;
8583 #endif
8584 #ifdef INET6
8585                 case AF_INET6:
8586                         if (net->mtu > SCTP_MIN_OVERHEAD)
8587                                 omtu = net->mtu - SCTP_MIN_OVERHEAD;
8588                         else
8589                                 omtu = 0;
8590                         break;
8591 #endif
8592                 default:
8593                         /* TSNH */
8594                         omtu = 0;
8595                         break;
8596                 }
8597                 if ((((SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) ||
8598                     (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED)) &&
8599                     (skip_data_for_this_net == 0)) ||
8600                     (cookie)) {
8601                         TAILQ_FOREACH_SAFE(chk, &asoc->send_queue, sctp_next, nchk) {
8602                                 if (no_data_chunks) {
8603                                         /* let only control go out */
8604                                         *reason_code = 1;
8605                                         break;
8606                                 }
8607                                 if (net->flight_size >= net->cwnd) {
8608                                         /* skip this net, no room for data */
8609                                         *reason_code = 2;
8610                                         break;
8611                                 }
8612                                 if ((chk->whoTo != NULL) &&
8613                                     (chk->whoTo != net)) {
8614                                         /* Don't send the chunk on this net */
8615                                         continue;
8616                                 }
8617                                 if (asoc->sctp_cmt_on_off == 0) {
8618                                         if ((asoc->alternate) &&
8619                                             (asoc->alternate != net) &&
8620                                             (chk->whoTo == NULL)) {
8621                                                 continue;
8622                                         } else if ((net != asoc->primary_destination) &&
8623                                                     (asoc->alternate == NULL) &&
8624                                             (chk->whoTo == NULL)) {
8625                                                 continue;
8626                                         }
8627                                 }
8628                                 if ((chk->send_size > omtu) && ((chk->flags & CHUNK_FLAGS_FRAGMENT_OK) == 0)) {
8629                                         /*-
8630                                          * strange, we have a chunk that is
8631                                          * to big for its destination and
8632                                          * yet no fragment ok flag.
8633                                          * Something went wrong when the
8634                                          * PMTU changed...we did not mark
8635                                          * this chunk for some reason?? I
8636                                          * will fix it here by letting IP
8637                                          * fragment it for now and printing
8638                                          * a warning. This really should not
8639                                          * happen ...
8640                                          */
8641                                         SCTP_PRINTF("Warning chunk of %d bytes > mtu:%d and yet PMTU disc missed\n",
8642                                             chk->send_size, mtu);
8643                                         chk->flags |= CHUNK_FLAGS_FRAGMENT_OK;
8644                                 }
8645                                 if (SCTP_BASE_SYSCTL(sctp_enable_sack_immediately) &&
8646                                     ((asoc->state & SCTP_STATE_SHUTDOWN_PENDING) == SCTP_STATE_SHUTDOWN_PENDING)) {
8647                                         struct sctp_data_chunk *dchkh;
8648
8649                                         dchkh = mtod(chk->data, struct sctp_data_chunk *);
8650                                         dchkh->ch.chunk_flags |= SCTP_DATA_SACK_IMMEDIATELY;
8651                                 }
8652                                 if (((chk->send_size <= mtu) && (chk->send_size <= r_mtu)) ||
8653                                     ((chk->flags & CHUNK_FLAGS_FRAGMENT_OK) && (chk->send_size <= asoc->peers_rwnd))) {
8654                                         /* ok we will add this one */
8655
8656                                         /*
8657                                          * Add an AUTH chunk, if chunk
8658                                          * requires it, save the offset into
8659                                          * the chain for AUTH
8660                                          */
8661                                         if (data_auth_reqd) {
8662                                                 if (auth == NULL) {
8663                                                         outchain = sctp_add_auth_chunk(outchain,
8664                                                             &endoutchain,
8665                                                             &auth,
8666                                                             &auth_offset,
8667                                                             stcb,
8668                                                             SCTP_DATA);
8669                                                         auth_keyid = chk->auth_keyid;
8670                                                         override_ok = 0;
8671                                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8672                                                 } else if (override_ok) {
8673                                                         /*
8674                                                          * use this data's
8675                                                          * keyid
8676                                                          */
8677                                                         auth_keyid = chk->auth_keyid;
8678                                                         override_ok = 0;
8679                                                 } else if (auth_keyid != chk->auth_keyid) {
8680                                                         /*
8681                                                          * different keyid,
8682                                                          * so done bundling
8683                                                          */
8684                                                         break;
8685                                                 }
8686                                         }
8687                                         outchain = sctp_copy_mbufchain(chk->data, outchain, &endoutchain, 0,
8688                                             chk->send_size, chk->copy_by_ref);
8689                                         if (outchain == NULL) {
8690                                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "No memory?\n");
8691                                                 if (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
8692                                                         sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
8693                                                 }
8694                                                 *reason_code = 3;
8695                                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
8696                                                 return (ENOMEM);
8697                                         }
8698                                         /* upate our MTU size */
8699                                         /* Do clear IP_DF ? */
8700                                         if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
8701                                                 no_fragmentflg = 0;
8702                                         }
8703                                         /* unsigned subtraction of mtu */
8704                                         if (mtu > chk->send_size)
8705                                                 mtu -= chk->send_size;
8706                                         else
8707                                                 mtu = 0;
8708                                         /* unsigned subtraction of r_mtu */
8709                                         if (r_mtu > chk->send_size)
8710                                                 r_mtu -= chk->send_size;
8711                                         else
8712                                                 r_mtu = 0;
8713
8714                                         to_out += chk->send_size;
8715                                         if ((to_out > mx_mtu) && no_fragmentflg) {
8716 #ifdef INVARIANTS
8717                                                 panic("Exceeding mtu of %d out size is %d", mx_mtu, to_out);
8718 #else
8719                                                 SCTP_PRINTF("Exceeding mtu of %d out size is %d\n",
8720                                                     mx_mtu, to_out);
8721 #endif
8722                                         }
8723                                         chk->window_probe = 0;
8724                                         data_list[bundle_at++] = chk;
8725                                         if (bundle_at >= SCTP_MAX_DATA_BUNDLING) {
8726                                                 break;
8727                                         }
8728                                         if (chk->sent == SCTP_DATAGRAM_UNSENT) {
8729                                                 if ((chk->rec.data.rcv_flags & SCTP_DATA_UNORDERED) == 0) {
8730                                                         SCTP_STAT_INCR_COUNTER64(sctps_outorderchunks);
8731                                                 } else {
8732                                                         SCTP_STAT_INCR_COUNTER64(sctps_outunorderchunks);
8733                                                 }
8734                                                 if (((chk->rec.data.rcv_flags & SCTP_DATA_LAST_FRAG) == SCTP_DATA_LAST_FRAG) &&
8735                                                     ((chk->rec.data.rcv_flags & SCTP_DATA_FIRST_FRAG) == 0))
8736                                                         /*
8737                                                          * Count number of
8738                                                          * user msg's that
8739                                                          * were fragmented
8740                                                          * we do this by
8741                                                          * counting when we
8742                                                          * see a LAST
8743                                                          * fragment only.
8744                                                          */
8745                                                         SCTP_STAT_INCR_COUNTER64(sctps_fragusrmsgs);
8746                                         }
8747                                         if ((mtu == 0) || (r_mtu == 0) || (one_chunk)) {
8748                                                 if ((one_chunk) && (stcb->asoc.total_flight == 0)) {
8749                                                         data_list[0]->window_probe = 1;
8750                                                         net->window_probe = 1;
8751                                                 }
8752                                                 break;
8753                                         }
8754                                 } else {
8755                                         /*
8756                                          * Must be sent in order of the
8757                                          * TSN's (on a network)
8758                                          */
8759                                         break;
8760                                 }
8761                         }       /* for (chunk gather loop for this net) */
8762                 }               /* if asoc.state OPEN */
8763 no_data_fill:
8764                 /* Is there something to send for this destination? */
8765                 if (outchain) {
8766                         /* We may need to start a control timer or two */
8767                         if (asconf) {
8768                                 sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp,
8769                                     stcb, net);
8770                                 /*
8771                                  * do NOT clear the asconf flag as it is
8772                                  * used to do appropriate source address
8773                                  * selection.
8774                                  */
8775                         }
8776                         if (cookie) {
8777                                 sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, inp, stcb, net);
8778                                 cookie = 0;
8779                         }
8780                         /* must start a send timer if data is being sent */
8781                         if (bundle_at && (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer))) {
8782                                 /*
8783                                  * no timer running on this destination
8784                                  * restart it.
8785                                  */
8786                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
8787                         }
8788                         if (bundle_at || hbflag) {
8789                                 /* For data/asconf and hb set time */
8790                                 if (*now_filled == 0) {
8791                                         (void)SCTP_GETTIME_TIMEVAL(now);
8792                                         *now_filled = 1;
8793                                 }
8794                                 net->last_sent_time = *now;
8795                         }
8796                         /* Now send it, if there is anything to send :> */
8797                         if ((error = sctp_lowlevel_chunk_output(inp,
8798                             stcb,
8799                             net,
8800                             (struct sockaddr *)&net->ro._l_addr,
8801                             outchain,
8802                             auth_offset,
8803                             auth,
8804                             auth_keyid,
8805                             no_fragmentflg,
8806                             bundle_at,
8807                             asconf,
8808                             inp->sctp_lport, stcb->rport,
8809                             htonl(stcb->asoc.peer_vtag),
8810                             net->port, NULL,
8811                             0, 0,
8812                             so_locked))) {
8813                                 /* error, we could not output */
8814                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
8815                                 if (from_where == 0) {
8816                                         SCTP_STAT_INCR(sctps_lowlevelerrusr);
8817                                 }
8818                                 if (error == ENOBUFS) {
8819                                         asoc->ifp_had_enobuf = 1;
8820                                         SCTP_STAT_INCR(sctps_lowlevelerr);
8821                                 }
8822                                 if (error == EHOSTUNREACH) {
8823                                         /*
8824                                          * Destination went unreachable
8825                                          * during this send
8826                                          */
8827                                         sctp_move_chunks_from_net(stcb, net);
8828                                 }
8829                                 *reason_code = 6;
8830                                 /*-
8831                                  * I add this line to be paranoid. As far as
8832                                  * I can tell the continue, takes us back to
8833                                  * the top of the for, but just to make sure
8834                                  * I will reset these again here.
8835                                  */
8836                                 ctl_cnt = bundle_at = 0;
8837                                 continue;       /* This takes us back to the
8838                                                  * for() for the nets. */
8839                         } else {
8840                                 asoc->ifp_had_enobuf = 0;
8841                         }
8842                         endoutchain = NULL;
8843                         auth = NULL;
8844                         auth_offset = 0;
8845                         if (!no_out_cnt) {
8846                                 *num_out += (ctl_cnt + bundle_at);
8847                         }
8848                         if (bundle_at) {
8849                                 /* setup for a RTO measurement */
8850                                 tsns_sent = data_list[0]->rec.data.tsn;
8851                                 /* fill time if not already filled */
8852                                 if (*now_filled == 0) {
8853                                         (void)SCTP_GETTIME_TIMEVAL(&asoc->time_last_sent);
8854                                         *now_filled = 1;
8855                                         *now = asoc->time_last_sent;
8856                                 } else {
8857                                         asoc->time_last_sent = *now;
8858                                 }
8859                                 if (net->rto_needed) {
8860                                         data_list[0]->do_rtt = 1;
8861                                         net->rto_needed = 0;
8862                                 }
8863                                 SCTP_STAT_INCR_BY(sctps_senddata, bundle_at);
8864                                 sctp_clean_up_datalist(stcb, asoc, data_list, bundle_at, net);
8865                         }
8866                         if (one_chunk) {
8867                                 break;
8868                         }
8869                 }
8870                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
8871                         sctp_log_cwnd(stcb, net, tsns_sent, SCTP_CWND_LOG_FROM_SEND);
8872                 }
8873         }
8874         if (old_start_at == NULL) {
8875                 old_start_at = start_at;
8876                 start_at = TAILQ_FIRST(&asoc->nets);
8877                 if (old_start_at)
8878                         goto again_one_more_time;
8879         }
8880         /*
8881          * At the end there should be no NON timed chunks hanging on this
8882          * queue.
8883          */
8884         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
8885                 sctp_log_cwnd(stcb, net, *num_out, SCTP_CWND_LOG_FROM_SEND);
8886         }
8887         if ((*num_out == 0) && (*reason_code == 0)) {
8888                 *reason_code = 4;
8889         } else {
8890                 *reason_code = 5;
8891         }
8892         sctp_clean_up_ctl(stcb, asoc, so_locked);
8893         return (0);
8894 }
8895
8896 void
8897 sctp_queue_op_err(struct sctp_tcb *stcb, struct mbuf *op_err)
8898 {
8899         /*-
8900          * Prepend a OPERATIONAL_ERROR chunk header and put on the end of
8901          * the control chunk queue.
8902          */
8903         struct sctp_chunkhdr *hdr;
8904         struct sctp_tmit_chunk *chk;
8905         struct mbuf *mat, *last_mbuf;
8906         uint32_t chunk_length;
8907         uint16_t padding_length;
8908
8909         SCTP_TCB_LOCK_ASSERT(stcb);
8910         SCTP_BUF_PREPEND(op_err, sizeof(struct sctp_chunkhdr), M_NOWAIT);
8911         if (op_err == NULL) {
8912                 return;
8913         }
8914         last_mbuf = NULL;
8915         chunk_length = 0;
8916         for (mat = op_err; mat != NULL; mat = SCTP_BUF_NEXT(mat)) {
8917                 chunk_length += SCTP_BUF_LEN(mat);
8918                 if (SCTP_BUF_NEXT(mat) == NULL) {
8919                         last_mbuf = mat;
8920                 }
8921         }
8922         if (chunk_length > SCTP_MAX_CHUNK_LENGTH) {
8923                 sctp_m_freem(op_err);
8924                 return;
8925         }
8926         padding_length = chunk_length % 4;
8927         if (padding_length != 0) {
8928                 padding_length = 4 - padding_length;
8929         }
8930         if (padding_length != 0) {
8931                 if (sctp_add_pad_tombuf(last_mbuf, padding_length) == NULL) {
8932                         sctp_m_freem(op_err);
8933                         return;
8934                 }
8935         }
8936         sctp_alloc_a_chunk(stcb, chk);
8937         if (chk == NULL) {
8938                 /* no memory */
8939                 sctp_m_freem(op_err);
8940                 return;
8941         }
8942         chk->copy_by_ref = 0;
8943         chk->send_size = (uint16_t)chunk_length;
8944         chk->sent = SCTP_DATAGRAM_UNSENT;
8945         chk->snd_count = 0;
8946         chk->asoc = &stcb->asoc;
8947         chk->data = op_err;
8948         chk->whoTo = NULL;
8949         chk->rec.chunk_id.id = SCTP_OPERATION_ERROR;
8950         chk->rec.chunk_id.can_take_data = 0;
8951         hdr = mtod(op_err, struct sctp_chunkhdr *);
8952         hdr->chunk_type = SCTP_OPERATION_ERROR;
8953         hdr->chunk_flags = 0;
8954         hdr->chunk_length = htons(chk->send_size);
8955         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
8956         chk->asoc->ctrl_queue_cnt++;
8957 }
8958
8959 int
8960 sctp_send_cookie_echo(struct mbuf *m,
8961     int offset,
8962     struct sctp_tcb *stcb,
8963     struct sctp_nets *net)
8964 {
8965         /*-
8966          * pull out the cookie and put it at the front of the control chunk
8967          * queue.
8968          */
8969         int at;
8970         struct mbuf *cookie;
8971         struct sctp_paramhdr param, *phdr;
8972         struct sctp_chunkhdr *hdr;
8973         struct sctp_tmit_chunk *chk;
8974         uint16_t ptype, plen;
8975
8976         SCTP_TCB_LOCK_ASSERT(stcb);
8977         /* First find the cookie in the param area */
8978         cookie = NULL;
8979         at = offset + sizeof(struct sctp_init_chunk);
8980         for (;;) {
8981                 phdr = sctp_get_next_param(m, at, &param, sizeof(param));
8982                 if (phdr == NULL) {
8983                         return (-3);
8984                 }
8985                 ptype = ntohs(phdr->param_type);
8986                 plen = ntohs(phdr->param_length);
8987                 if (ptype == SCTP_STATE_COOKIE) {
8988                         int pad;
8989
8990                         /* found the cookie */
8991                         if ((pad = (plen % 4))) {
8992                                 plen += 4 - pad;
8993                         }
8994                         cookie = SCTP_M_COPYM(m, at, plen, M_NOWAIT);
8995                         if (cookie == NULL) {
8996                                 /* No memory */
8997                                 return (-2);
8998                         }
8999 #ifdef SCTP_MBUF_LOGGING
9000                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
9001                                 sctp_log_mbc(cookie, SCTP_MBUF_ICOPY);
9002                         }
9003 #endif
9004                         break;
9005                 }
9006                 at += SCTP_SIZE32(plen);
9007         }
9008         /* ok, we got the cookie lets change it into a cookie echo chunk */
9009         /* first the change from param to cookie */
9010         hdr = mtod(cookie, struct sctp_chunkhdr *);
9011         hdr->chunk_type = SCTP_COOKIE_ECHO;
9012         hdr->chunk_flags = 0;
9013         /* get the chunk stuff now and place it in the FRONT of the queue */
9014         sctp_alloc_a_chunk(stcb, chk);
9015         if (chk == NULL) {
9016                 /* no memory */
9017                 sctp_m_freem(cookie);
9018                 return (-5);
9019         }
9020         chk->copy_by_ref = 0;
9021         chk->rec.chunk_id.id = SCTP_COOKIE_ECHO;
9022         chk->rec.chunk_id.can_take_data = 0;
9023         chk->flags = CHUNK_FLAGS_FRAGMENT_OK;
9024         chk->send_size = plen;
9025         chk->sent = SCTP_DATAGRAM_UNSENT;
9026         chk->snd_count = 0;
9027         chk->asoc = &stcb->asoc;
9028         chk->data = cookie;
9029         chk->whoTo = net;
9030         atomic_add_int(&chk->whoTo->ref_count, 1);
9031         TAILQ_INSERT_HEAD(&chk->asoc->control_send_queue, chk, sctp_next);
9032         chk->asoc->ctrl_queue_cnt++;
9033         return (0);
9034 }
9035
9036 void
9037 sctp_send_heartbeat_ack(struct sctp_tcb *stcb,
9038     struct mbuf *m,
9039     int offset,
9040     int chk_length,
9041     struct sctp_nets *net)
9042 {
9043         /*
9044          * take a HB request and make it into a HB ack and send it.
9045          */
9046         struct mbuf *outchain;
9047         struct sctp_chunkhdr *chdr;
9048         struct sctp_tmit_chunk *chk;
9049
9050
9051         if (net == NULL)
9052                 /* must have a net pointer */
9053                 return;
9054
9055         outchain = SCTP_M_COPYM(m, offset, chk_length, M_NOWAIT);
9056         if (outchain == NULL) {
9057                 /* gak out of memory */
9058                 return;
9059         }
9060 #ifdef SCTP_MBUF_LOGGING
9061         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
9062                 sctp_log_mbc(outchain, SCTP_MBUF_ICOPY);
9063         }
9064 #endif
9065         chdr = mtod(outchain, struct sctp_chunkhdr *);
9066         chdr->chunk_type = SCTP_HEARTBEAT_ACK;
9067         chdr->chunk_flags = 0;
9068         if (chk_length % 4) {
9069                 /* need pad */
9070                 uint32_t cpthis = 0;
9071                 int padlen;
9072
9073                 padlen = 4 - (chk_length % 4);
9074                 m_copyback(outchain, chk_length, padlen, (caddr_t)&cpthis);
9075         }
9076         sctp_alloc_a_chunk(stcb, chk);
9077         if (chk == NULL) {
9078                 /* no memory */
9079                 sctp_m_freem(outchain);
9080                 return;
9081         }
9082         chk->copy_by_ref = 0;
9083         chk->rec.chunk_id.id = SCTP_HEARTBEAT_ACK;
9084         chk->rec.chunk_id.can_take_data = 1;
9085         chk->flags = 0;
9086         chk->send_size = chk_length;
9087         chk->sent = SCTP_DATAGRAM_UNSENT;
9088         chk->snd_count = 0;
9089         chk->asoc = &stcb->asoc;
9090         chk->data = outchain;
9091         chk->whoTo = net;
9092         atomic_add_int(&chk->whoTo->ref_count, 1);
9093         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9094         chk->asoc->ctrl_queue_cnt++;
9095 }
9096
9097 void
9098 sctp_send_cookie_ack(struct sctp_tcb *stcb)
9099 {
9100         /* formulate and queue a cookie-ack back to sender */
9101         struct mbuf *cookie_ack;
9102         struct sctp_chunkhdr *hdr;
9103         struct sctp_tmit_chunk *chk;
9104
9105         SCTP_TCB_LOCK_ASSERT(stcb);
9106
9107         cookie_ack = sctp_get_mbuf_for_msg(sizeof(struct sctp_chunkhdr), 0, M_NOWAIT, 1, MT_HEADER);
9108         if (cookie_ack == NULL) {
9109                 /* no mbuf's */
9110                 return;
9111         }
9112         SCTP_BUF_RESV_UF(cookie_ack, SCTP_MIN_OVERHEAD);
9113         sctp_alloc_a_chunk(stcb, chk);
9114         if (chk == NULL) {
9115                 /* no memory */
9116                 sctp_m_freem(cookie_ack);
9117                 return;
9118         }
9119         chk->copy_by_ref = 0;
9120         chk->rec.chunk_id.id = SCTP_COOKIE_ACK;
9121         chk->rec.chunk_id.can_take_data = 1;
9122         chk->flags = 0;
9123         chk->send_size = sizeof(struct sctp_chunkhdr);
9124         chk->sent = SCTP_DATAGRAM_UNSENT;
9125         chk->snd_count = 0;
9126         chk->asoc = &stcb->asoc;
9127         chk->data = cookie_ack;
9128         if (chk->asoc->last_control_chunk_from != NULL) {
9129                 chk->whoTo = chk->asoc->last_control_chunk_from;
9130                 atomic_add_int(&chk->whoTo->ref_count, 1);
9131         } else {
9132                 chk->whoTo = NULL;
9133         }
9134         hdr = mtod(cookie_ack, struct sctp_chunkhdr *);
9135         hdr->chunk_type = SCTP_COOKIE_ACK;
9136         hdr->chunk_flags = 0;
9137         hdr->chunk_length = htons(chk->send_size);
9138         SCTP_BUF_LEN(cookie_ack) = chk->send_size;
9139         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9140         chk->asoc->ctrl_queue_cnt++;
9141         return;
9142 }
9143
9144
9145 void
9146 sctp_send_shutdown_ack(struct sctp_tcb *stcb, struct sctp_nets *net)
9147 {
9148         /* formulate and queue a SHUTDOWN-ACK back to the sender */
9149         struct mbuf *m_shutdown_ack;
9150         struct sctp_shutdown_ack_chunk *ack_cp;
9151         struct sctp_tmit_chunk *chk;
9152
9153         m_shutdown_ack = sctp_get_mbuf_for_msg(sizeof(struct sctp_shutdown_ack_chunk), 0, M_NOWAIT, 1, MT_HEADER);
9154         if (m_shutdown_ack == NULL) {
9155                 /* no mbuf's */
9156                 return;
9157         }
9158         SCTP_BUF_RESV_UF(m_shutdown_ack, SCTP_MIN_OVERHEAD);
9159         sctp_alloc_a_chunk(stcb, chk);
9160         if (chk == NULL) {
9161                 /* no memory */
9162                 sctp_m_freem(m_shutdown_ack);
9163                 return;
9164         }
9165         chk->copy_by_ref = 0;
9166         chk->rec.chunk_id.id = SCTP_SHUTDOWN_ACK;
9167         chk->rec.chunk_id.can_take_data = 1;
9168         chk->flags = 0;
9169         chk->send_size = sizeof(struct sctp_chunkhdr);
9170         chk->sent = SCTP_DATAGRAM_UNSENT;
9171         chk->snd_count = 0;
9172         chk->flags = 0;
9173         chk->asoc = &stcb->asoc;
9174         chk->data = m_shutdown_ack;
9175         chk->whoTo = net;
9176         if (chk->whoTo) {
9177                 atomic_add_int(&chk->whoTo->ref_count, 1);
9178         }
9179         ack_cp = mtod(m_shutdown_ack, struct sctp_shutdown_ack_chunk *);
9180         ack_cp->ch.chunk_type = SCTP_SHUTDOWN_ACK;
9181         ack_cp->ch.chunk_flags = 0;
9182         ack_cp->ch.chunk_length = htons(chk->send_size);
9183         SCTP_BUF_LEN(m_shutdown_ack) = chk->send_size;
9184         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9185         chk->asoc->ctrl_queue_cnt++;
9186         return;
9187 }
9188
9189 void
9190 sctp_send_shutdown(struct sctp_tcb *stcb, struct sctp_nets *net)
9191 {
9192         /* formulate and queue a SHUTDOWN to the sender */
9193         struct mbuf *m_shutdown;
9194         struct sctp_shutdown_chunk *shutdown_cp;
9195         struct sctp_tmit_chunk *chk;
9196
9197         TAILQ_FOREACH(chk, &stcb->asoc.control_send_queue, sctp_next) {
9198                 if (chk->rec.chunk_id.id == SCTP_SHUTDOWN) {
9199                         /* We already have a SHUTDOWN queued. Reuse it. */
9200                         if (chk->whoTo) {
9201                                 sctp_free_remote_addr(chk->whoTo);
9202                                 chk->whoTo = NULL;
9203                         }
9204                         break;
9205                 }
9206         }
9207         if (chk == NULL) {
9208                 m_shutdown = sctp_get_mbuf_for_msg(sizeof(struct sctp_shutdown_chunk), 0, M_NOWAIT, 1, MT_HEADER);
9209                 if (m_shutdown == NULL) {
9210                         /* no mbuf's */
9211                         return;
9212                 }
9213                 SCTP_BUF_RESV_UF(m_shutdown, SCTP_MIN_OVERHEAD);
9214                 sctp_alloc_a_chunk(stcb, chk);
9215                 if (chk == NULL) {
9216                         /* no memory */
9217                         sctp_m_freem(m_shutdown);
9218                         return;
9219                 }
9220                 chk->copy_by_ref = 0;
9221                 chk->rec.chunk_id.id = SCTP_SHUTDOWN;
9222                 chk->rec.chunk_id.can_take_data = 1;
9223                 chk->flags = 0;
9224                 chk->send_size = sizeof(struct sctp_shutdown_chunk);
9225                 chk->sent = SCTP_DATAGRAM_UNSENT;
9226                 chk->snd_count = 0;
9227                 chk->flags = 0;
9228                 chk->asoc = &stcb->asoc;
9229                 chk->data = m_shutdown;
9230                 chk->whoTo = net;
9231                 if (chk->whoTo) {
9232                         atomic_add_int(&chk->whoTo->ref_count, 1);
9233                 }
9234                 shutdown_cp = mtod(m_shutdown, struct sctp_shutdown_chunk *);
9235                 shutdown_cp->ch.chunk_type = SCTP_SHUTDOWN;
9236                 shutdown_cp->ch.chunk_flags = 0;
9237                 shutdown_cp->ch.chunk_length = htons(chk->send_size);
9238                 shutdown_cp->cumulative_tsn_ack = htonl(stcb->asoc.cumulative_tsn);
9239                 SCTP_BUF_LEN(m_shutdown) = chk->send_size;
9240                 TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9241                 chk->asoc->ctrl_queue_cnt++;
9242         } else {
9243                 TAILQ_REMOVE(&stcb->asoc.control_send_queue, chk, sctp_next);
9244                 chk->whoTo = net;
9245                 if (chk->whoTo) {
9246                         atomic_add_int(&chk->whoTo->ref_count, 1);
9247                 }
9248                 shutdown_cp = mtod(chk->data, struct sctp_shutdown_chunk *);
9249                 shutdown_cp->cumulative_tsn_ack = htonl(stcb->asoc.cumulative_tsn);
9250                 TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
9251         }
9252         return;
9253 }
9254
9255 void
9256 sctp_send_asconf(struct sctp_tcb *stcb, struct sctp_nets *net, int addr_locked)
9257 {
9258         /*
9259          * formulate and queue an ASCONF to the peer. ASCONF parameters
9260          * should be queued on the assoc queue.
9261          */
9262         struct sctp_tmit_chunk *chk;
9263         struct mbuf *m_asconf;
9264         int len;
9265
9266         SCTP_TCB_LOCK_ASSERT(stcb);
9267
9268         if ((!TAILQ_EMPTY(&stcb->asoc.asconf_send_queue)) &&
9269             (!sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_MULTIPLE_ASCONFS))) {
9270                 /* can't send a new one if there is one in flight already */
9271                 return;
9272         }
9273         /* compose an ASCONF chunk, maximum length is PMTU */
9274         m_asconf = sctp_compose_asconf(stcb, &len, addr_locked);
9275         if (m_asconf == NULL) {
9276                 return;
9277         }
9278         sctp_alloc_a_chunk(stcb, chk);
9279         if (chk == NULL) {
9280                 /* no memory */
9281                 sctp_m_freem(m_asconf);
9282                 return;
9283         }
9284         chk->copy_by_ref = 0;
9285         chk->rec.chunk_id.id = SCTP_ASCONF;
9286         chk->rec.chunk_id.can_take_data = 0;
9287         chk->flags = CHUNK_FLAGS_FRAGMENT_OK;
9288         chk->data = m_asconf;
9289         chk->send_size = len;
9290         chk->sent = SCTP_DATAGRAM_UNSENT;
9291         chk->snd_count = 0;
9292         chk->asoc = &stcb->asoc;
9293         chk->whoTo = net;
9294         if (chk->whoTo) {
9295                 atomic_add_int(&chk->whoTo->ref_count, 1);
9296         }
9297         TAILQ_INSERT_TAIL(&chk->asoc->asconf_send_queue, chk, sctp_next);
9298         chk->asoc->ctrl_queue_cnt++;
9299         return;
9300 }
9301
9302 void
9303 sctp_send_asconf_ack(struct sctp_tcb *stcb)
9304 {
9305         /*
9306          * formulate and queue a asconf-ack back to sender. the asconf-ack
9307          * must be stored in the tcb.
9308          */
9309         struct sctp_tmit_chunk *chk;
9310         struct sctp_asconf_ack *ack, *latest_ack;
9311         struct mbuf *m_ack;
9312         struct sctp_nets *net = NULL;
9313
9314         SCTP_TCB_LOCK_ASSERT(stcb);
9315         /* Get the latest ASCONF-ACK */
9316         latest_ack = TAILQ_LAST(&stcb->asoc.asconf_ack_sent, sctp_asconf_ackhead);
9317         if (latest_ack == NULL) {
9318                 return;
9319         }
9320         if (latest_ack->last_sent_to != NULL &&
9321             latest_ack->last_sent_to == stcb->asoc.last_control_chunk_from) {
9322                 /* we're doing a retransmission */
9323                 net = sctp_find_alternate_net(stcb, stcb->asoc.last_control_chunk_from, 0);
9324                 if (net == NULL) {
9325                         /* no alternate */
9326                         if (stcb->asoc.last_control_chunk_from == NULL) {
9327                                 if (stcb->asoc.alternate) {
9328                                         net = stcb->asoc.alternate;
9329                                 } else {
9330                                         net = stcb->asoc.primary_destination;
9331                                 }
9332                         } else {
9333                                 net = stcb->asoc.last_control_chunk_from;
9334                         }
9335                 }
9336         } else {
9337                 /* normal case */
9338                 if (stcb->asoc.last_control_chunk_from == NULL) {
9339                         if (stcb->asoc.alternate) {
9340                                 net = stcb->asoc.alternate;
9341                         } else {
9342                                 net = stcb->asoc.primary_destination;
9343                         }
9344                 } else {
9345                         net = stcb->asoc.last_control_chunk_from;
9346                 }
9347         }
9348         latest_ack->last_sent_to = net;
9349
9350         TAILQ_FOREACH(ack, &stcb->asoc.asconf_ack_sent, next) {
9351                 if (ack->data == NULL) {
9352                         continue;
9353                 }
9354                 /* copy the asconf_ack */
9355                 m_ack = SCTP_M_COPYM(ack->data, 0, M_COPYALL, M_NOWAIT);
9356                 if (m_ack == NULL) {
9357                         /* couldn't copy it */
9358                         return;
9359                 }
9360 #ifdef SCTP_MBUF_LOGGING
9361                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
9362                         sctp_log_mbc(m_ack, SCTP_MBUF_ICOPY);
9363                 }
9364 #endif
9365
9366                 sctp_alloc_a_chunk(stcb, chk);
9367                 if (chk == NULL) {
9368                         /* no memory */
9369                         if (m_ack)
9370                                 sctp_m_freem(m_ack);
9371                         return;
9372                 }
9373                 chk->copy_by_ref = 0;
9374                 chk->rec.chunk_id.id = SCTP_ASCONF_ACK;
9375                 chk->rec.chunk_id.can_take_data = 1;
9376                 chk->flags = CHUNK_FLAGS_FRAGMENT_OK;
9377                 chk->whoTo = net;
9378                 if (chk->whoTo) {
9379                         atomic_add_int(&chk->whoTo->ref_count, 1);
9380                 }
9381                 chk->data = m_ack;
9382                 chk->send_size = ack->len;
9383                 chk->sent = SCTP_DATAGRAM_UNSENT;
9384                 chk->snd_count = 0;
9385                 chk->asoc = &stcb->asoc;
9386
9387                 TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9388                 chk->asoc->ctrl_queue_cnt++;
9389         }
9390         return;
9391 }
9392
9393
9394 static int
9395 sctp_chunk_retransmission(struct sctp_inpcb *inp,
9396     struct sctp_tcb *stcb,
9397     struct sctp_association *asoc,
9398     int *cnt_out, struct timeval *now, int *now_filled, int *fr_done, int so_locked
9399 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
9400     SCTP_UNUSED
9401 #endif
9402 )
9403 {
9404         /*-
9405          * send out one MTU of retransmission. If fast_retransmit is
9406          * happening we ignore the cwnd. Otherwise we obey the cwnd and
9407          * rwnd. For a Cookie or Asconf in the control chunk queue we
9408          * retransmit them by themselves.
9409          *
9410          * For data chunks we will pick out the lowest TSN's in the sent_queue
9411          * marked for resend and bundle them all together (up to a MTU of
9412          * destination). The address to send to should have been
9413          * selected/changed where the retransmission was marked (i.e. in FR
9414          * or t3-timeout routines).
9415          */
9416         struct sctp_tmit_chunk *data_list[SCTP_MAX_DATA_BUNDLING];
9417         struct sctp_tmit_chunk *chk, *fwd;
9418         struct mbuf *m, *endofchain;
9419         struct sctp_nets *net = NULL;
9420         uint32_t tsns_sent = 0;
9421         int no_fragmentflg, bundle_at, cnt_thru;
9422         unsigned int mtu;
9423         int error, i, one_chunk, fwd_tsn, ctl_cnt, tmr_started;
9424         struct sctp_auth_chunk *auth = NULL;
9425         uint32_t auth_offset = 0;
9426         uint16_t auth_keyid;
9427         int override_ok = 1;
9428         int data_auth_reqd = 0;
9429         uint32_t dmtu = 0;
9430
9431         SCTP_TCB_LOCK_ASSERT(stcb);
9432         tmr_started = ctl_cnt = bundle_at = error = 0;
9433         no_fragmentflg = 1;
9434         fwd_tsn = 0;
9435         *cnt_out = 0;
9436         fwd = NULL;
9437         endofchain = m = NULL;
9438         auth_keyid = stcb->asoc.authinfo.active_keyid;
9439 #ifdef SCTP_AUDITING_ENABLED
9440         sctp_audit_log(0xC3, 1);
9441 #endif
9442         if ((TAILQ_EMPTY(&asoc->sent_queue)) &&
9443             (TAILQ_EMPTY(&asoc->control_send_queue))) {
9444                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "SCTP hits empty queue with cnt set to %d?\n",
9445                     asoc->sent_queue_retran_cnt);
9446                 asoc->sent_queue_cnt = 0;
9447                 asoc->sent_queue_cnt_removeable = 0;
9448                 /* send back 0/0 so we enter normal transmission */
9449                 *cnt_out = 0;
9450                 return (0);
9451         }
9452         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
9453                 if ((chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) ||
9454                     (chk->rec.chunk_id.id == SCTP_STREAM_RESET) ||
9455                     (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN)) {
9456                         if (chk->sent != SCTP_DATAGRAM_RESEND) {
9457                                 continue;
9458                         }
9459                         if (chk->rec.chunk_id.id == SCTP_STREAM_RESET) {
9460                                 if (chk != asoc->str_reset) {
9461                                         /*
9462                                          * not eligible for retran if its
9463                                          * not ours
9464                                          */
9465                                         continue;
9466                                 }
9467                         }
9468                         ctl_cnt++;
9469                         if (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN) {
9470                                 fwd_tsn = 1;
9471                         }
9472                         /*
9473                          * Add an AUTH chunk, if chunk requires it save the
9474                          * offset into the chain for AUTH
9475                          */
9476                         if ((auth == NULL) &&
9477                             (sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
9478                             stcb->asoc.peer_auth_chunks))) {
9479                                 m = sctp_add_auth_chunk(m, &endofchain,
9480                                     &auth, &auth_offset,
9481                                     stcb,
9482                                     chk->rec.chunk_id.id);
9483                                 SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
9484                         }
9485                         m = sctp_copy_mbufchain(chk->data, m, &endofchain, 0, chk->send_size, chk->copy_by_ref);
9486                         break;
9487                 }
9488         }
9489         one_chunk = 0;
9490         cnt_thru = 0;
9491         /* do we have control chunks to retransmit? */
9492         if (m != NULL) {
9493                 /* Start a timer no matter if we succeed or fail */
9494                 if (chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
9495                         sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, inp, stcb, chk->whoTo);
9496                 } else if (chk->rec.chunk_id.id == SCTP_ASCONF)
9497                         sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp, stcb, chk->whoTo);
9498                 chk->snd_count++;       /* update our count */
9499                 if ((error = sctp_lowlevel_chunk_output(inp, stcb, chk->whoTo,
9500                     (struct sockaddr *)&chk->whoTo->ro._l_addr, m,
9501                     auth_offset, auth, stcb->asoc.authinfo.active_keyid,
9502                     no_fragmentflg, 0, 0,
9503                     inp->sctp_lport, stcb->rport, htonl(stcb->asoc.peer_vtag),
9504                     chk->whoTo->port, NULL,
9505                     0, 0,
9506                     so_locked))) {
9507                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
9508                         if (error == ENOBUFS) {
9509                                 asoc->ifp_had_enobuf = 1;
9510                                 SCTP_STAT_INCR(sctps_lowlevelerr);
9511                         }
9512                         return (error);
9513                 } else {
9514                         asoc->ifp_had_enobuf = 0;
9515                 }
9516                 endofchain = NULL;
9517                 auth = NULL;
9518                 auth_offset = 0;
9519                 /*
9520                  * We don't want to mark the net->sent time here since this
9521                  * we use this for HB and retrans cannot measure RTT
9522                  */
9523                 /* (void)SCTP_GETTIME_TIMEVAL(&chk->whoTo->last_sent_time); */
9524                 *cnt_out += 1;
9525                 chk->sent = SCTP_DATAGRAM_SENT;
9526                 sctp_ucount_decr(stcb->asoc.sent_queue_retran_cnt);
9527                 if (fwd_tsn == 0) {
9528                         return (0);
9529                 } else {
9530                         /* Clean up the fwd-tsn list */
9531                         sctp_clean_up_ctl(stcb, asoc, so_locked);
9532                         return (0);
9533                 }
9534         }
9535         /*
9536          * Ok, it is just data retransmission we need to do or that and a
9537          * fwd-tsn with it all.
9538          */
9539         if (TAILQ_EMPTY(&asoc->sent_queue)) {
9540                 return (SCTP_RETRAN_DONE);
9541         }
9542         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED) ||
9543             (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT)) {
9544                 /* not yet open, resend the cookie and that is it */
9545                 return (1);
9546         }
9547 #ifdef SCTP_AUDITING_ENABLED
9548         sctp_auditing(20, inp, stcb, NULL);
9549 #endif
9550         data_auth_reqd = sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks);
9551         TAILQ_FOREACH(chk, &asoc->sent_queue, sctp_next) {
9552                 if (chk->sent != SCTP_DATAGRAM_RESEND) {
9553                         /* No, not sent to this net or not ready for rtx */
9554                         continue;
9555                 }
9556                 if (chk->data == NULL) {
9557                         SCTP_PRINTF("TSN:%x chk->snd_count:%d chk->sent:%d can't retran - no data\n",
9558                             chk->rec.data.tsn, chk->snd_count, chk->sent);
9559                         continue;
9560                 }
9561                 if ((SCTP_BASE_SYSCTL(sctp_max_retran_chunk)) &&
9562                     (chk->snd_count >= SCTP_BASE_SYSCTL(sctp_max_retran_chunk))) {
9563                         struct mbuf *op_err;
9564                         char msg[SCTP_DIAG_INFO_LEN];
9565
9566                         snprintf(msg, sizeof(msg), "TSN %8.8x retransmitted %d times, giving up",
9567                             chk->rec.data.tsn, chk->snd_count);
9568                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
9569                             msg);
9570                         atomic_add_int(&stcb->asoc.refcnt, 1);
9571                         sctp_abort_an_association(stcb->sctp_ep, stcb, op_err,
9572                             so_locked);
9573                         SCTP_TCB_LOCK(stcb);
9574                         atomic_subtract_int(&stcb->asoc.refcnt, 1);
9575                         return (SCTP_RETRAN_EXIT);
9576                 }
9577                 /* pick up the net */
9578                 net = chk->whoTo;
9579                 switch (net->ro._l_addr.sa.sa_family) {
9580 #ifdef INET
9581                 case AF_INET:
9582                         mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
9583                         break;
9584 #endif
9585 #ifdef INET6
9586                 case AF_INET6:
9587                         mtu = net->mtu - SCTP_MIN_OVERHEAD;
9588                         break;
9589 #endif
9590                 default:
9591                         /* TSNH */
9592                         mtu = net->mtu;
9593                         break;
9594                 }
9595
9596                 if ((asoc->peers_rwnd < mtu) && (asoc->total_flight > 0)) {
9597                         /* No room in peers rwnd */
9598                         uint32_t tsn;
9599
9600                         tsn = asoc->last_acked_seq + 1;
9601                         if (tsn == chk->rec.data.tsn) {
9602                                 /*
9603                                  * we make a special exception for this
9604                                  * case. The peer has no rwnd but is missing
9605                                  * the lowest chunk.. which is probably what
9606                                  * is holding up the rwnd.
9607                                  */
9608                                 goto one_chunk_around;
9609                         }
9610                         return (1);
9611                 }
9612 one_chunk_around:
9613                 if (asoc->peers_rwnd < mtu) {
9614                         one_chunk = 1;
9615                         if ((asoc->peers_rwnd == 0) &&
9616                             (asoc->total_flight == 0)) {
9617                                 chk->window_probe = 1;
9618                                 chk->whoTo->window_probe = 1;
9619                         }
9620                 }
9621 #ifdef SCTP_AUDITING_ENABLED
9622                 sctp_audit_log(0xC3, 2);
9623 #endif
9624                 bundle_at = 0;
9625                 m = NULL;
9626                 net->fast_retran_ip = 0;
9627                 if (chk->rec.data.doing_fast_retransmit == 0) {
9628                         /*
9629                          * if no FR in progress skip destination that have
9630                          * flight_size > cwnd.
9631                          */
9632                         if (net->flight_size >= net->cwnd) {
9633                                 continue;
9634                         }
9635                 } else {
9636                         /*
9637                          * Mark the destination net to have FR recovery
9638                          * limits put on it.
9639                          */
9640                         *fr_done = 1;
9641                         net->fast_retran_ip = 1;
9642                 }
9643
9644                 /*
9645                  * if no AUTH is yet included and this chunk requires it,
9646                  * make sure to account for it.  We don't apply the size
9647                  * until the AUTH chunk is actually added below in case
9648                  * there is no room for this chunk.
9649                  */
9650                 if (data_auth_reqd && (auth == NULL)) {
9651                         dmtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
9652                 } else
9653                         dmtu = 0;
9654
9655                 if ((chk->send_size <= (mtu - dmtu)) ||
9656                     (chk->flags & CHUNK_FLAGS_FRAGMENT_OK)) {
9657                         /* ok we will add this one */
9658                         if (data_auth_reqd) {
9659                                 if (auth == NULL) {
9660                                         m = sctp_add_auth_chunk(m,
9661                                             &endofchain,
9662                                             &auth,
9663                                             &auth_offset,
9664                                             stcb,
9665                                             SCTP_DATA);
9666                                         auth_keyid = chk->auth_keyid;
9667                                         override_ok = 0;
9668                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
9669                                 } else if (override_ok) {
9670                                         auth_keyid = chk->auth_keyid;
9671                                         override_ok = 0;
9672                                 } else if (chk->auth_keyid != auth_keyid) {
9673                                         /* different keyid, so done bundling */
9674                                         break;
9675                                 }
9676                         }
9677                         m = sctp_copy_mbufchain(chk->data, m, &endofchain, 0, chk->send_size, chk->copy_by_ref);
9678                         if (m == NULL) {
9679                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
9680                                 return (ENOMEM);
9681                         }
9682                         /* Do clear IP_DF ? */
9683                         if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
9684                                 no_fragmentflg = 0;
9685                         }
9686                         /* upate our MTU size */
9687                         if (mtu > (chk->send_size + dmtu))
9688                                 mtu -= (chk->send_size + dmtu);
9689                         else
9690                                 mtu = 0;
9691                         data_list[bundle_at++] = chk;
9692                         if (one_chunk && (asoc->total_flight <= 0)) {
9693                                 SCTP_STAT_INCR(sctps_windowprobed);
9694                         }
9695                 }
9696                 if (one_chunk == 0) {
9697                         /*
9698                          * now are there anymore forward from chk to pick
9699                          * up?
9700                          */
9701                         for (fwd = TAILQ_NEXT(chk, sctp_next); fwd != NULL; fwd = TAILQ_NEXT(fwd, sctp_next)) {
9702                                 if (fwd->sent != SCTP_DATAGRAM_RESEND) {
9703                                         /* Nope, not for retran */
9704                                         continue;
9705                                 }
9706                                 if (fwd->whoTo != net) {
9707                                         /* Nope, not the net in question */
9708                                         continue;
9709                                 }
9710                                 if (data_auth_reqd && (auth == NULL)) {
9711                                         dmtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
9712                                 } else
9713                                         dmtu = 0;
9714                                 if (fwd->send_size <= (mtu - dmtu)) {
9715                                         if (data_auth_reqd) {
9716                                                 if (auth == NULL) {
9717                                                         m = sctp_add_auth_chunk(m,
9718                                                             &endofchain,
9719                                                             &auth,
9720                                                             &auth_offset,
9721                                                             stcb,
9722                                                             SCTP_DATA);
9723                                                         auth_keyid = fwd->auth_keyid;
9724                                                         override_ok = 0;
9725                                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
9726                                                 } else if (override_ok) {
9727                                                         auth_keyid = fwd->auth_keyid;
9728                                                         override_ok = 0;
9729                                                 } else if (fwd->auth_keyid != auth_keyid) {
9730                                                         /*
9731                                                          * different keyid,
9732                                                          * so done bundling
9733                                                          */
9734                                                         break;
9735                                                 }
9736                                         }
9737                                         m = sctp_copy_mbufchain(fwd->data, m, &endofchain, 0, fwd->send_size, fwd->copy_by_ref);
9738                                         if (m == NULL) {
9739                                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
9740                                                 return (ENOMEM);
9741                                         }
9742                                         /* Do clear IP_DF ? */
9743                                         if (fwd->flags & CHUNK_FLAGS_FRAGMENT_OK) {
9744                                                 no_fragmentflg = 0;
9745                                         }
9746                                         /* upate our MTU size */
9747                                         if (mtu > (fwd->send_size + dmtu))
9748                                                 mtu -= (fwd->send_size + dmtu);
9749                                         else
9750                                                 mtu = 0;
9751                                         data_list[bundle_at++] = fwd;
9752                                         if (bundle_at >= SCTP_MAX_DATA_BUNDLING) {
9753                                                 break;
9754                                         }
9755                                 } else {
9756                                         /* can't fit so we are done */
9757                                         break;
9758                                 }
9759                         }
9760                 }
9761                 /* Is there something to send for this destination? */
9762                 if (m) {
9763                         /*
9764                          * No matter if we fail/or succeed we should start a
9765                          * timer. A failure is like a lost IP packet :-)
9766                          */
9767                         if (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
9768                                 /*
9769                                  * no timer running on this destination
9770                                  * restart it.
9771                                  */
9772                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
9773                                 tmr_started = 1;
9774                         }
9775                         /* Now lets send it, if there is anything to send :> */
9776                         if ((error = sctp_lowlevel_chunk_output(inp, stcb, net,
9777                             (struct sockaddr *)&net->ro._l_addr, m,
9778                             auth_offset, auth, auth_keyid,
9779                             no_fragmentflg, 0, 0,
9780                             inp->sctp_lport, stcb->rport, htonl(stcb->asoc.peer_vtag),
9781                             net->port, NULL,
9782                             0, 0,
9783                             so_locked))) {
9784                                 /* error, we could not output */
9785                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
9786                                 if (error == ENOBUFS) {
9787                                         asoc->ifp_had_enobuf = 1;
9788                                         SCTP_STAT_INCR(sctps_lowlevelerr);
9789                                 }
9790                                 return (error);
9791                         } else {
9792                                 asoc->ifp_had_enobuf = 0;
9793                         }
9794                         endofchain = NULL;
9795                         auth = NULL;
9796                         auth_offset = 0;
9797                         /* For HB's */
9798                         /*
9799                          * We don't want to mark the net->sent time here
9800                          * since this we use this for HB and retrans cannot
9801                          * measure RTT
9802                          */
9803                         /* (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time); */
9804
9805                         /* For auto-close */
9806                         cnt_thru++;
9807                         if (*now_filled == 0) {
9808                                 (void)SCTP_GETTIME_TIMEVAL(&asoc->time_last_sent);
9809                                 *now = asoc->time_last_sent;
9810                                 *now_filled = 1;
9811                         } else {
9812                                 asoc->time_last_sent = *now;
9813                         }
9814                         *cnt_out += bundle_at;
9815 #ifdef SCTP_AUDITING_ENABLED
9816                         sctp_audit_log(0xC4, bundle_at);
9817 #endif
9818                         if (bundle_at) {
9819                                 tsns_sent = data_list[0]->rec.data.tsn;
9820                         }
9821                         for (i = 0; i < bundle_at; i++) {
9822                                 SCTP_STAT_INCR(sctps_sendretransdata);
9823                                 data_list[i]->sent = SCTP_DATAGRAM_SENT;
9824                                 /*
9825                                  * When we have a revoked data, and we
9826                                  * retransmit it, then we clear the revoked
9827                                  * flag since this flag dictates if we
9828                                  * subtracted from the fs
9829                                  */
9830                                 if (data_list[i]->rec.data.chunk_was_revoked) {
9831                                         /* Deflate the cwnd */
9832                                         data_list[i]->whoTo->cwnd -= data_list[i]->book_size;
9833                                         data_list[i]->rec.data.chunk_was_revoked = 0;
9834                                 }
9835                                 data_list[i]->snd_count++;
9836                                 sctp_ucount_decr(asoc->sent_queue_retran_cnt);
9837                                 /* record the time */
9838                                 data_list[i]->sent_rcv_time = asoc->time_last_sent;
9839                                 if (data_list[i]->book_size_scale) {
9840                                         /*
9841                                          * need to double the book size on
9842                                          * this one
9843                                          */
9844                                         data_list[i]->book_size_scale = 0;
9845                                         /*
9846                                          * Since we double the booksize, we
9847                                          * must also double the output queue
9848                                          * size, since this get shrunk when
9849                                          * we free by this amount.
9850                                          */
9851                                         atomic_add_int(&((asoc)->total_output_queue_size), data_list[i]->book_size);
9852                                         data_list[i]->book_size *= 2;
9853
9854
9855                                 } else {
9856                                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_RWND_ENABLE) {
9857                                                 sctp_log_rwnd(SCTP_DECREASE_PEER_RWND,
9858                                                     asoc->peers_rwnd, data_list[i]->send_size, SCTP_BASE_SYSCTL(sctp_peer_chunk_oh));
9859                                         }
9860                                         asoc->peers_rwnd = sctp_sbspace_sub(asoc->peers_rwnd,
9861                                             (uint32_t)(data_list[i]->send_size +
9862                                             SCTP_BASE_SYSCTL(sctp_peer_chunk_oh)));
9863                                 }
9864                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
9865                                         sctp_misc_ints(SCTP_FLIGHT_LOG_UP_RSND,
9866                                             data_list[i]->whoTo->flight_size,
9867                                             data_list[i]->book_size,
9868                                             (uint32_t)(uintptr_t)data_list[i]->whoTo,
9869                                             data_list[i]->rec.data.tsn);
9870                                 }
9871                                 sctp_flight_size_increase(data_list[i]);
9872                                 sctp_total_flight_increase(stcb, data_list[i]);
9873                                 if (asoc->peers_rwnd < stcb->sctp_ep->sctp_ep.sctp_sws_sender) {
9874                                         /* SWS sender side engages */
9875                                         asoc->peers_rwnd = 0;
9876                                 }
9877                                 if ((i == 0) &&
9878                                     (data_list[i]->rec.data.doing_fast_retransmit)) {
9879                                         SCTP_STAT_INCR(sctps_sendfastretrans);
9880                                         if ((data_list[i] == TAILQ_FIRST(&asoc->sent_queue)) &&
9881                                             (tmr_started == 0)) {
9882                                                 /*-
9883                                                  * ok we just fast-retrans'd
9884                                                  * the lowest TSN, i.e the
9885                                                  * first on the list. In
9886                                                  * this case we want to give
9887                                                  * some more time to get a
9888                                                  * SACK back without a
9889                                                  * t3-expiring.
9890                                                  */
9891                                                 sctp_timer_stop(SCTP_TIMER_TYPE_SEND, inp, stcb, net,
9892                                                     SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_2);
9893                                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
9894                                         }
9895                                 }
9896                         }
9897                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
9898                                 sctp_log_cwnd(stcb, net, tsns_sent, SCTP_CWND_LOG_FROM_RESEND);
9899                         }
9900 #ifdef SCTP_AUDITING_ENABLED
9901                         sctp_auditing(21, inp, stcb, NULL);
9902 #endif
9903                 } else {
9904                         /* None will fit */
9905                         return (1);
9906                 }
9907                 if (asoc->sent_queue_retran_cnt <= 0) {
9908                         /* all done we have no more to retran */
9909                         asoc->sent_queue_retran_cnt = 0;
9910                         break;
9911                 }
9912                 if (one_chunk) {
9913                         /* No more room in rwnd */
9914                         return (1);
9915                 }
9916                 /* stop the for loop here. we sent out a packet */
9917                 break;
9918         }
9919         return (0);
9920 }
9921
9922 static void
9923 sctp_timer_validation(struct sctp_inpcb *inp,
9924     struct sctp_tcb *stcb,
9925     struct sctp_association *asoc)
9926 {
9927         struct sctp_nets *net;
9928
9929         /* Validate that a timer is running somewhere */
9930         TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
9931                 if (SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
9932                         /* Here is a timer */
9933                         return;
9934                 }
9935         }
9936         SCTP_TCB_LOCK_ASSERT(stcb);
9937         /* Gak, we did not have a timer somewhere */
9938         SCTPDBG(SCTP_DEBUG_OUTPUT3, "Deadlock avoided starting timer on a dest at retran\n");
9939         if (asoc->alternate) {
9940                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, asoc->alternate);
9941         } else {
9942                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, asoc->primary_destination);
9943         }
9944         return;
9945 }
9946
9947 void
9948 sctp_chunk_output(struct sctp_inpcb *inp,
9949     struct sctp_tcb *stcb,
9950     int from_where,
9951     int so_locked
9952 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
9953     SCTP_UNUSED
9954 #endif
9955 )
9956 {
9957         /*-
9958          * Ok this is the generic chunk service queue. we must do the
9959          * following:
9960          * - See if there are retransmits pending, if so we must
9961          *   do these first.
9962          * - Service the stream queue that is next, moving any
9963          *   message (note I must get a complete message i.e.
9964          *   FIRST/MIDDLE and LAST to the out queue in one pass) and assigning
9965          *   TSN's
9966          * - Check to see if the cwnd/rwnd allows any output, if so we
9967          *   go ahead and fomulate and send the low level chunks. Making sure
9968          *   to combine any control in the control chunk queue also.
9969          */
9970         struct sctp_association *asoc;
9971         struct sctp_nets *net;
9972         int error = 0, num_out, tot_out = 0, ret = 0, reason_code;
9973         unsigned int burst_cnt = 0;
9974         struct timeval now;
9975         int now_filled = 0;
9976         int nagle_on;
9977         int frag_point = sctp_get_frag_point(stcb, &stcb->asoc);
9978         int un_sent = 0;
9979         int fr_done;
9980         unsigned int tot_frs = 0;
9981
9982         asoc = &stcb->asoc;
9983 do_it_again:
9984         /* The Nagle algorithm is only applied when handling a send call. */
9985         if (from_where == SCTP_OUTPUT_FROM_USR_SEND) {
9986                 if (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_NODELAY)) {
9987                         nagle_on = 0;
9988                 } else {
9989                         nagle_on = 1;
9990                 }
9991         } else {
9992                 nagle_on = 0;
9993         }
9994         SCTP_TCB_LOCK_ASSERT(stcb);
9995
9996         un_sent = (stcb->asoc.total_output_queue_size - stcb->asoc.total_flight);
9997
9998         if ((un_sent <= 0) &&
9999             (TAILQ_EMPTY(&asoc->control_send_queue)) &&
10000             (TAILQ_EMPTY(&asoc->asconf_send_queue)) &&
10001             (asoc->sent_queue_retran_cnt == 0) &&
10002             (asoc->trigger_reset == 0)) {
10003                 /* Nothing to do unless there is something to be sent left */
10004                 return;
10005         }
10006         /*
10007          * Do we have something to send, data or control AND a sack timer
10008          * running, if so piggy-back the sack.
10009          */
10010         if (SCTP_OS_TIMER_PENDING(&stcb->asoc.dack_timer.timer)) {
10011                 sctp_send_sack(stcb, so_locked);
10012                 (void)SCTP_OS_TIMER_STOP(&stcb->asoc.dack_timer.timer);
10013         }
10014         while (asoc->sent_queue_retran_cnt) {
10015                 /*-
10016                  * Ok, it is retransmission time only, we send out only ONE
10017                  * packet with a single call off to the retran code.
10018                  */
10019                 if (from_where == SCTP_OUTPUT_FROM_COOKIE_ACK) {
10020                         /*-
10021                          * Special hook for handling cookiess discarded
10022                          * by peer that carried data. Send cookie-ack only
10023                          * and then the next call with get the retran's.
10024                          */
10025                         (void)sctp_med_chunk_output(inp, stcb, asoc, &num_out, &reason_code, 1,
10026                             from_where,
10027                             &now, &now_filled, frag_point, so_locked);
10028                         return;
10029                 } else if (from_where != SCTP_OUTPUT_FROM_HB_TMR) {
10030                         /* if its not from a HB then do it */
10031                         fr_done = 0;
10032                         ret = sctp_chunk_retransmission(inp, stcb, asoc, &num_out, &now, &now_filled, &fr_done, so_locked);
10033                         if (fr_done) {
10034                                 tot_frs++;
10035                         }
10036                 } else {
10037                         /*
10038                          * its from any other place, we don't allow retran
10039                          * output (only control)
10040                          */
10041                         ret = 1;
10042                 }
10043                 if (ret > 0) {
10044                         /* Can't send anymore */
10045                         /*-
10046                          * now lets push out control by calling med-level
10047                          * output once. this assures that we WILL send HB's
10048                          * if queued too.
10049                          */
10050                         (void)sctp_med_chunk_output(inp, stcb, asoc, &num_out, &reason_code, 1,
10051                             from_where,
10052                             &now, &now_filled, frag_point, so_locked);
10053 #ifdef SCTP_AUDITING_ENABLED
10054                         sctp_auditing(8, inp, stcb, NULL);
10055 #endif
10056                         sctp_timer_validation(inp, stcb, asoc);
10057                         return;
10058                 }
10059                 if (ret < 0) {
10060                         /*-
10061                          * The count was off.. retran is not happening so do
10062                          * the normal retransmission.
10063                          */
10064 #ifdef SCTP_AUDITING_ENABLED
10065                         sctp_auditing(9, inp, stcb, NULL);
10066 #endif
10067                         if (ret == SCTP_RETRAN_EXIT) {
10068                                 return;
10069                         }
10070                         break;
10071                 }
10072                 if (from_where == SCTP_OUTPUT_FROM_T3) {
10073                         /* Only one transmission allowed out of a timeout */
10074 #ifdef SCTP_AUDITING_ENABLED
10075                         sctp_auditing(10, inp, stcb, NULL);
10076 #endif
10077                         /* Push out any control */
10078                         (void)sctp_med_chunk_output(inp, stcb, asoc, &num_out, &reason_code, 1, from_where,
10079                             &now, &now_filled, frag_point, so_locked);
10080                         return;
10081                 }
10082                 if ((asoc->fr_max_burst > 0) && (tot_frs >= asoc->fr_max_burst)) {
10083                         /* Hit FR burst limit */
10084                         return;
10085                 }
10086                 if ((num_out == 0) && (ret == 0)) {
10087                         /* No more retrans to send */
10088                         break;
10089                 }
10090         }
10091 #ifdef SCTP_AUDITING_ENABLED
10092         sctp_auditing(12, inp, stcb, NULL);
10093 #endif
10094         /* Check for bad destinations, if they exist move chunks around. */
10095         TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
10096                 if (!(net->dest_state & SCTP_ADDR_REACHABLE)) {
10097                         /*-
10098                          * if possible move things off of this address we
10099                          * still may send below due to the dormant state but
10100                          * we try to find an alternate address to send to
10101                          * and if we have one we move all queued data on the
10102                          * out wheel to this alternate address.
10103                          */
10104                         if (net->ref_count > 1)
10105                                 sctp_move_chunks_from_net(stcb, net);
10106                 } else {
10107                         /*-
10108                          * if ((asoc->sat_network) || (net->addr_is_local))
10109                          * { burst_limit = asoc->max_burst *
10110                          * SCTP_SAT_NETWORK_BURST_INCR; }
10111                          */
10112                         if (asoc->max_burst > 0) {
10113                                 if (SCTP_BASE_SYSCTL(sctp_use_cwnd_based_maxburst)) {
10114                                         if ((net->flight_size + (asoc->max_burst * net->mtu)) < net->cwnd) {
10115                                                 /*
10116                                                  * JRS - Use the congestion
10117                                                  * control given in the
10118                                                  * congestion control module
10119                                                  */
10120                                                 asoc->cc_functions.sctp_cwnd_update_after_output(stcb, net, asoc->max_burst);
10121                                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_MAXBURST_ENABLE) {
10122                                                         sctp_log_maxburst(stcb, net, 0, asoc->max_burst, SCTP_MAX_BURST_APPLIED);
10123                                                 }
10124                                                 SCTP_STAT_INCR(sctps_maxburstqueued);
10125                                         }
10126                                         net->fast_retran_ip = 0;
10127                                 } else {
10128                                         if (net->flight_size == 0) {
10129                                                 /*
10130                                                  * Should be decaying the
10131                                                  * cwnd here
10132                                                  */
10133                                                 ;
10134                                         }
10135                                 }
10136                         }
10137                 }
10138
10139         }
10140         burst_cnt = 0;
10141         do {
10142                 error = sctp_med_chunk_output(inp, stcb, asoc, &num_out,
10143                     &reason_code, 0, from_where,
10144                     &now, &now_filled, frag_point, so_locked);
10145                 if (error) {
10146                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Error %d was returned from med-c-op\n", error);
10147                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_MAXBURST_ENABLE) {
10148                                 sctp_log_maxburst(stcb, asoc->primary_destination, error, burst_cnt, SCTP_MAX_BURST_ERROR_STOP);
10149                         }
10150                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
10151                                 sctp_log_cwnd(stcb, NULL, error, SCTP_SEND_NOW_COMPLETES);
10152                                 sctp_log_cwnd(stcb, NULL, 0xdeadbeef, SCTP_SEND_NOW_COMPLETES);
10153                         }
10154                         break;
10155                 }
10156                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "m-c-o put out %d\n", num_out);
10157
10158                 tot_out += num_out;
10159                 burst_cnt++;
10160                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
10161                         sctp_log_cwnd(stcb, NULL, num_out, SCTP_SEND_NOW_COMPLETES);
10162                         if (num_out == 0) {
10163                                 sctp_log_cwnd(stcb, NULL, reason_code, SCTP_SEND_NOW_COMPLETES);
10164                         }
10165                 }
10166                 if (nagle_on) {
10167                         /*
10168                          * When the Nagle algorithm is used, look at how
10169                          * much is unsent, then if its smaller than an MTU
10170                          * and we have data in flight we stop, except if we
10171                          * are handling a fragmented user message.
10172                          */
10173                         un_sent = stcb->asoc.total_output_queue_size - stcb->asoc.total_flight;
10174                         if ((un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD)) &&
10175                             (stcb->asoc.total_flight > 0)) {
10176 /*      &&                   sctp_is_feature_on(inp, SCTP_PCB_FLAGS_EXPLICIT_EOR))) {*/
10177                                 break;
10178                         }
10179                 }
10180                 if (TAILQ_EMPTY(&asoc->control_send_queue) &&
10181                     TAILQ_EMPTY(&asoc->send_queue) &&
10182                     sctp_is_there_unsent_data(stcb, so_locked) == 0) {
10183                         /* Nothing left to send */
10184                         break;
10185                 }
10186                 if ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) <= 0) {
10187                         /* Nothing left to send */
10188                         break;
10189                 }
10190         } while (num_out &&
10191             ((asoc->max_burst == 0) ||
10192             SCTP_BASE_SYSCTL(sctp_use_cwnd_based_maxburst) ||
10193             (burst_cnt < asoc->max_burst)));
10194
10195         if (SCTP_BASE_SYSCTL(sctp_use_cwnd_based_maxburst) == 0) {
10196                 if ((asoc->max_burst > 0) && (burst_cnt >= asoc->max_burst)) {
10197                         SCTP_STAT_INCR(sctps_maxburstqueued);
10198                         asoc->burst_limit_applied = 1;
10199                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_MAXBURST_ENABLE) {
10200                                 sctp_log_maxburst(stcb, asoc->primary_destination, 0, burst_cnt, SCTP_MAX_BURST_APPLIED);
10201                         }
10202                 } else {
10203                         asoc->burst_limit_applied = 0;
10204                 }
10205         }
10206         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
10207                 sctp_log_cwnd(stcb, NULL, tot_out, SCTP_SEND_NOW_COMPLETES);
10208         }
10209         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Ok, we have put out %d chunks\n",
10210             tot_out);
10211
10212         /*-
10213          * Now we need to clean up the control chunk chain if a ECNE is on
10214          * it. It must be marked as UNSENT again so next call will continue
10215          * to send it until such time that we get a CWR, to remove it.
10216          */
10217         if (stcb->asoc.ecn_echo_cnt_onq)
10218                 sctp_fix_ecn_echo(asoc);
10219
10220         if (stcb->asoc.trigger_reset) {
10221                 if (sctp_send_stream_reset_out_if_possible(stcb, so_locked) == 0) {
10222                         goto do_it_again;
10223                 }
10224         }
10225         return;
10226 }
10227
10228
10229 int
10230 sctp_output(
10231     struct sctp_inpcb *inp,
10232     struct mbuf *m,
10233     struct sockaddr *addr,
10234     struct mbuf *control,
10235     struct thread *p,
10236     int flags)
10237 {
10238         if (inp == NULL) {
10239                 SCTP_LTRACE_ERR_RET_PKT(m, inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
10240                 return (EINVAL);
10241         }
10242         if (inp->sctp_socket == NULL) {
10243                 SCTP_LTRACE_ERR_RET_PKT(m, inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
10244                 return (EINVAL);
10245         }
10246         return (sctp_sosend(inp->sctp_socket,
10247             addr,
10248             (struct uio *)NULL,
10249             m,
10250             control,
10251             flags, p
10252             ));
10253 }
10254
10255 void
10256 send_forward_tsn(struct sctp_tcb *stcb,
10257     struct sctp_association *asoc)
10258 {
10259         struct sctp_tmit_chunk *chk, *at, *tp1, *last;
10260         struct sctp_forward_tsn_chunk *fwdtsn;
10261         struct sctp_strseq *strseq;
10262         struct sctp_strseq_mid *strseq_m;
10263         uint32_t advance_peer_ack_point;
10264         unsigned int cnt_of_space, i, ovh;
10265         unsigned int space_needed;
10266         unsigned int cnt_of_skipped = 0;
10267
10268         SCTP_TCB_LOCK_ASSERT(stcb);
10269         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
10270                 if (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN) {
10271                         /* mark it to unsent */
10272                         chk->sent = SCTP_DATAGRAM_UNSENT;
10273                         chk->snd_count = 0;
10274                         /* Do we correct its output location? */
10275                         if (chk->whoTo) {
10276                                 sctp_free_remote_addr(chk->whoTo);
10277                                 chk->whoTo = NULL;
10278                         }
10279                         goto sctp_fill_in_rest;
10280                 }
10281         }
10282         /* Ok if we reach here we must build one */
10283         sctp_alloc_a_chunk(stcb, chk);
10284         if (chk == NULL) {
10285                 return;
10286         }
10287         asoc->fwd_tsn_cnt++;
10288         chk->copy_by_ref = 0;
10289         /*
10290          * We don't do the old thing here since this is used not for on-wire
10291          * but to tell if we are sending a fwd-tsn by the stack during
10292          * output. And if its a IFORWARD or a FORWARD it is a fwd-tsn.
10293          */
10294         chk->rec.chunk_id.id = SCTP_FORWARD_CUM_TSN;
10295         chk->rec.chunk_id.can_take_data = 0;
10296         chk->flags = 0;
10297         chk->asoc = asoc;
10298         chk->whoTo = NULL;
10299         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
10300         if (chk->data == NULL) {
10301                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
10302                 return;
10303         }
10304         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
10305         chk->sent = SCTP_DATAGRAM_UNSENT;
10306         chk->snd_count = 0;
10307         TAILQ_INSERT_TAIL(&asoc->control_send_queue, chk, sctp_next);
10308         asoc->ctrl_queue_cnt++;
10309 sctp_fill_in_rest:
10310         /*-
10311          * Here we go through and fill out the part that deals with
10312          * stream/seq of the ones we skip.
10313          */
10314         SCTP_BUF_LEN(chk->data) = 0;
10315         TAILQ_FOREACH(at, &asoc->sent_queue, sctp_next) {
10316                 if ((at->sent != SCTP_FORWARD_TSN_SKIP) &&
10317                     (at->sent != SCTP_DATAGRAM_NR_ACKED)) {
10318                         /* no more to look at */
10319                         break;
10320                 }
10321                 if (!asoc->idata_supported && (at->rec.data.rcv_flags & SCTP_DATA_UNORDERED)) {
10322                         /* We don't report these */
10323                         continue;
10324                 }
10325                 cnt_of_skipped++;
10326         }
10327         if (asoc->idata_supported) {
10328                 space_needed = (sizeof(struct sctp_forward_tsn_chunk) +
10329                     (cnt_of_skipped * sizeof(struct sctp_strseq_mid)));
10330         } else {
10331                 space_needed = (sizeof(struct sctp_forward_tsn_chunk) +
10332                     (cnt_of_skipped * sizeof(struct sctp_strseq)));
10333         }
10334         cnt_of_space = (unsigned int)M_TRAILINGSPACE(chk->data);
10335
10336         if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
10337                 ovh = SCTP_MIN_OVERHEAD;
10338         } else {
10339                 ovh = SCTP_MIN_V4_OVERHEAD;
10340         }
10341         if (cnt_of_space > (asoc->smallest_mtu - ovh)) {
10342                 /* trim to a mtu size */
10343                 cnt_of_space = asoc->smallest_mtu - ovh;
10344         }
10345         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_TRY_ADVANCE) {
10346                 sctp_misc_ints(SCTP_FWD_TSN_CHECK,
10347                     0xff, 0, cnt_of_skipped,
10348                     asoc->advanced_peer_ack_point);
10349         }
10350         advance_peer_ack_point = asoc->advanced_peer_ack_point;
10351         if (cnt_of_space < space_needed) {
10352                 /*-
10353                  * ok we must trim down the chunk by lowering the
10354                  * advance peer ack point.
10355                  */
10356                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_TRY_ADVANCE) {
10357                         sctp_misc_ints(SCTP_FWD_TSN_CHECK,
10358                             0xff, 0xff, cnt_of_space,
10359                             space_needed);
10360                 }
10361                 cnt_of_skipped = cnt_of_space - sizeof(struct sctp_forward_tsn_chunk);
10362                 if (asoc->idata_supported) {
10363                         cnt_of_skipped /= sizeof(struct sctp_strseq_mid);
10364                 } else {
10365                         cnt_of_skipped /= sizeof(struct sctp_strseq);
10366                 }
10367                 /*-
10368                  * Go through and find the TSN that will be the one
10369                  * we report.
10370                  */
10371                 at = TAILQ_FIRST(&asoc->sent_queue);
10372                 if (at != NULL) {
10373                         for (i = 0; i < cnt_of_skipped; i++) {
10374                                 tp1 = TAILQ_NEXT(at, sctp_next);
10375                                 if (tp1 == NULL) {
10376                                         break;
10377                                 }
10378                                 at = tp1;
10379                         }
10380                 }
10381                 if (at && SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_TRY_ADVANCE) {
10382                         sctp_misc_ints(SCTP_FWD_TSN_CHECK,
10383                             0xff, cnt_of_skipped, at->rec.data.tsn,
10384                             asoc->advanced_peer_ack_point);
10385                 }
10386                 last = at;
10387                 /*-
10388                  * last now points to last one I can report, update
10389                  * peer ack point
10390                  */
10391                 if (last) {
10392                         advance_peer_ack_point = last->rec.data.tsn;
10393                 }
10394                 if (asoc->idata_supported) {
10395                         space_needed = sizeof(struct sctp_forward_tsn_chunk) +
10396                             cnt_of_skipped * sizeof(struct sctp_strseq_mid);
10397                 } else {
10398                         space_needed = sizeof(struct sctp_forward_tsn_chunk) +
10399                             cnt_of_skipped * sizeof(struct sctp_strseq);
10400                 }
10401         }
10402         chk->send_size = space_needed;
10403         /* Setup the chunk */
10404         fwdtsn = mtod(chk->data, struct sctp_forward_tsn_chunk *);
10405         fwdtsn->ch.chunk_length = htons(chk->send_size);
10406         fwdtsn->ch.chunk_flags = 0;
10407         if (asoc->idata_supported) {
10408                 fwdtsn->ch.chunk_type = SCTP_IFORWARD_CUM_TSN;
10409         } else {
10410                 fwdtsn->ch.chunk_type = SCTP_FORWARD_CUM_TSN;
10411         }
10412         fwdtsn->new_cumulative_tsn = htonl(advance_peer_ack_point);
10413         SCTP_BUF_LEN(chk->data) = chk->send_size;
10414         fwdtsn++;
10415         /*-
10416          * Move pointer to after the fwdtsn and transfer to the
10417          * strseq pointer.
10418          */
10419         if (asoc->idata_supported) {
10420                 strseq_m = (struct sctp_strseq_mid *)fwdtsn;
10421                 strseq = NULL;
10422         } else {
10423                 strseq = (struct sctp_strseq *)fwdtsn;
10424                 strseq_m = NULL;
10425         }
10426         /*-
10427          * Now populate the strseq list. This is done blindly
10428          * without pulling out duplicate stream info. This is
10429          * inefficent but won't harm the process since the peer will
10430          * look at these in sequence and will thus release anything.
10431          * It could mean we exceed the PMTU and chop off some that
10432          * we could have included.. but this is unlikely (aka 1432/4
10433          * would mean 300+ stream seq's would have to be reported in
10434          * one FWD-TSN. With a bit of work we can later FIX this to
10435          * optimize and pull out duplicates.. but it does add more
10436          * overhead. So for now... not!
10437          */
10438         i = 0;
10439         TAILQ_FOREACH(at, &asoc->sent_queue, sctp_next) {
10440                 if (i >= cnt_of_skipped) {
10441                         break;
10442                 }
10443                 if (!asoc->idata_supported && (at->rec.data.rcv_flags & SCTP_DATA_UNORDERED)) {
10444                         /* We don't report these */
10445                         continue;
10446                 }
10447                 if (at->rec.data.tsn == advance_peer_ack_point) {
10448                         at->rec.data.fwd_tsn_cnt = 0;
10449                 }
10450                 if (asoc->idata_supported) {
10451                         strseq_m->sid = htons(at->rec.data.sid);
10452                         if (at->rec.data.rcv_flags & SCTP_DATA_UNORDERED) {
10453                                 strseq_m->flags = htons(PR_SCTP_UNORDERED_FLAG);
10454                         } else {
10455                                 strseq_m->flags = 0;
10456                         }
10457                         strseq_m->mid = htonl(at->rec.data.mid);
10458                         strseq_m++;
10459                 } else {
10460                         strseq->sid = htons(at->rec.data.sid);
10461                         strseq->ssn = htons((uint16_t)at->rec.data.mid);
10462                         strseq++;
10463                 }
10464                 i++;
10465         }
10466         return;
10467 }
10468
10469 void
10470 sctp_send_sack(struct sctp_tcb *stcb, int so_locked
10471 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
10472     SCTP_UNUSED
10473 #endif
10474 )
10475 {
10476         /*-
10477          * Queue up a SACK or NR-SACK in the control queue.
10478          * We must first check to see if a SACK or NR-SACK is
10479          * somehow on the control queue.
10480          * If so, we will take and and remove the old one.
10481          */
10482         struct sctp_association *asoc;
10483         struct sctp_tmit_chunk *chk, *a_chk;
10484         struct sctp_sack_chunk *sack;
10485         struct sctp_nr_sack_chunk *nr_sack;
10486         struct sctp_gap_ack_block *gap_descriptor;
10487         const struct sack_track *selector;
10488         int mergeable = 0;
10489         int offset;
10490         caddr_t limit;
10491         uint32_t *dup;
10492         int limit_reached = 0;
10493         unsigned int i, siz, j;
10494         unsigned int num_gap_blocks = 0, num_nr_gap_blocks = 0, space;
10495         int num_dups = 0;
10496         int space_req;
10497         uint32_t highest_tsn;
10498         uint8_t flags;
10499         uint8_t type;
10500         uint8_t tsn_map;
10501
10502         if (stcb->asoc.nrsack_supported == 1) {
10503                 type = SCTP_NR_SELECTIVE_ACK;
10504         } else {
10505                 type = SCTP_SELECTIVE_ACK;
10506         }
10507         a_chk = NULL;
10508         asoc = &stcb->asoc;
10509         SCTP_TCB_LOCK_ASSERT(stcb);
10510         if (asoc->last_data_chunk_from == NULL) {
10511                 /* Hmm we never received anything */
10512                 return;
10513         }
10514         sctp_slide_mapping_arrays(stcb);
10515         sctp_set_rwnd(stcb, asoc);
10516         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
10517                 if (chk->rec.chunk_id.id == type) {
10518                         /* Hmm, found a sack already on queue, remove it */
10519                         TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
10520                         asoc->ctrl_queue_cnt--;
10521                         a_chk = chk;
10522                         if (a_chk->data) {
10523                                 sctp_m_freem(a_chk->data);
10524                                 a_chk->data = NULL;
10525                         }
10526                         if (a_chk->whoTo) {
10527                                 sctp_free_remote_addr(a_chk->whoTo);
10528                                 a_chk->whoTo = NULL;
10529                         }
10530                         break;
10531                 }
10532         }
10533         if (a_chk == NULL) {
10534                 sctp_alloc_a_chunk(stcb, a_chk);
10535                 if (a_chk == NULL) {
10536                         /* No memory so we drop the idea, and set a timer */
10537                         if (stcb->asoc.delayed_ack) {
10538                                 sctp_timer_stop(SCTP_TIMER_TYPE_RECV,
10539                                     stcb->sctp_ep, stcb, NULL,
10540                                     SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_3);
10541                                 sctp_timer_start(SCTP_TIMER_TYPE_RECV,
10542                                     stcb->sctp_ep, stcb, NULL);
10543                         } else {
10544                                 stcb->asoc.send_sack = 1;
10545                         }
10546                         return;
10547                 }
10548                 a_chk->copy_by_ref = 0;
10549                 a_chk->rec.chunk_id.id = type;
10550                 a_chk->rec.chunk_id.can_take_data = 1;
10551         }
10552         /* Clear our pkt counts */
10553         asoc->data_pkts_seen = 0;
10554
10555         a_chk->flags = 0;
10556         a_chk->asoc = asoc;
10557         a_chk->snd_count = 0;
10558         a_chk->send_size = 0;   /* fill in later */
10559         a_chk->sent = SCTP_DATAGRAM_UNSENT;
10560         a_chk->whoTo = NULL;
10561
10562         if (!(asoc->last_data_chunk_from->dest_state & SCTP_ADDR_REACHABLE)) {
10563                 /*-
10564                  * Ok, the destination for the SACK is unreachable, lets see if
10565                  * we can select an alternate to asoc->last_data_chunk_from
10566                  */
10567                 a_chk->whoTo = sctp_find_alternate_net(stcb, asoc->last_data_chunk_from, 0);
10568                 if (a_chk->whoTo == NULL) {
10569                         /* Nope, no alternate */
10570                         a_chk->whoTo = asoc->last_data_chunk_from;
10571                 }
10572         } else {
10573                 a_chk->whoTo = asoc->last_data_chunk_from;
10574         }
10575         if (a_chk->whoTo) {
10576                 atomic_add_int(&a_chk->whoTo->ref_count, 1);
10577         }
10578         if (SCTP_TSN_GT(asoc->highest_tsn_inside_map, asoc->highest_tsn_inside_nr_map)) {
10579                 highest_tsn = asoc->highest_tsn_inside_map;
10580         } else {
10581                 highest_tsn = asoc->highest_tsn_inside_nr_map;
10582         }
10583         if (highest_tsn == asoc->cumulative_tsn) {
10584                 /* no gaps */
10585                 if (type == SCTP_SELECTIVE_ACK) {
10586                         space_req = sizeof(struct sctp_sack_chunk);
10587                 } else {
10588                         space_req = sizeof(struct sctp_nr_sack_chunk);
10589                 }
10590         } else {
10591                 /* gaps get a cluster */
10592                 space_req = MCLBYTES;
10593         }
10594         /* Ok now lets formulate a MBUF with our sack */
10595         a_chk->data = sctp_get_mbuf_for_msg(space_req, 0, M_NOWAIT, 1, MT_DATA);
10596         if ((a_chk->data == NULL) ||
10597             (a_chk->whoTo == NULL)) {
10598                 /* rats, no mbuf memory */
10599                 if (a_chk->data) {
10600                         /* was a problem with the destination */
10601                         sctp_m_freem(a_chk->data);
10602                         a_chk->data = NULL;
10603                 }
10604                 sctp_free_a_chunk(stcb, a_chk, so_locked);
10605                 /* sa_ignore NO_NULL_CHK */
10606                 if (stcb->asoc.delayed_ack) {
10607                         sctp_timer_stop(SCTP_TIMER_TYPE_RECV,
10608                             stcb->sctp_ep, stcb, NULL,
10609                             SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_4);
10610                         sctp_timer_start(SCTP_TIMER_TYPE_RECV,
10611                             stcb->sctp_ep, stcb, NULL);
10612                 } else {
10613                         stcb->asoc.send_sack = 1;
10614                 }
10615                 return;
10616         }
10617         /* ok, lets go through and fill it in */
10618         SCTP_BUF_RESV_UF(a_chk->data, SCTP_MIN_OVERHEAD);
10619         space = (unsigned int)M_TRAILINGSPACE(a_chk->data);
10620         if (space > (a_chk->whoTo->mtu - SCTP_MIN_OVERHEAD)) {
10621                 space = (a_chk->whoTo->mtu - SCTP_MIN_OVERHEAD);
10622         }
10623         limit = mtod(a_chk->data, caddr_t);
10624         limit += space;
10625
10626         flags = 0;
10627
10628         if ((asoc->sctp_cmt_on_off > 0) &&
10629             SCTP_BASE_SYSCTL(sctp_cmt_use_dac)) {
10630                 /*-
10631                  * CMT DAC algorithm: If 2 (i.e., 0x10) packets have been
10632                  * received, then set high bit to 1, else 0. Reset
10633                  * pkts_rcvd.
10634                  */
10635                 flags |= (asoc->cmt_dac_pkts_rcvd << 6);
10636                 asoc->cmt_dac_pkts_rcvd = 0;
10637         }
10638 #ifdef SCTP_ASOCLOG_OF_TSNS
10639         stcb->asoc.cumack_logsnt[stcb->asoc.cumack_log_atsnt] = asoc->cumulative_tsn;
10640         stcb->asoc.cumack_log_atsnt++;
10641         if (stcb->asoc.cumack_log_atsnt >= SCTP_TSN_LOG_SIZE) {
10642                 stcb->asoc.cumack_log_atsnt = 0;
10643         }
10644 #endif
10645         /* reset the readers interpretation */
10646         stcb->freed_by_sorcv_sincelast = 0;
10647
10648         if (type == SCTP_SELECTIVE_ACK) {
10649                 sack = mtod(a_chk->data, struct sctp_sack_chunk *);
10650                 nr_sack = NULL;
10651                 gap_descriptor = (struct sctp_gap_ack_block *)((caddr_t)sack + sizeof(struct sctp_sack_chunk));
10652                 if (highest_tsn > asoc->mapping_array_base_tsn) {
10653                         siz = (((highest_tsn - asoc->mapping_array_base_tsn) + 1) + 7) / 8;
10654                 } else {
10655                         siz = (((MAX_TSN - highest_tsn) + 1) + highest_tsn + 7) / 8;
10656                 }
10657         } else {
10658                 sack = NULL;
10659                 nr_sack = mtod(a_chk->data, struct sctp_nr_sack_chunk *);
10660                 gap_descriptor = (struct sctp_gap_ack_block *)((caddr_t)nr_sack + sizeof(struct sctp_nr_sack_chunk));
10661                 if (asoc->highest_tsn_inside_map > asoc->mapping_array_base_tsn) {
10662                         siz = (((asoc->highest_tsn_inside_map - asoc->mapping_array_base_tsn) + 1) + 7) / 8;
10663                 } else {
10664                         siz = (((MAX_TSN - asoc->mapping_array_base_tsn) + 1) + asoc->highest_tsn_inside_map + 7) / 8;
10665                 }
10666         }
10667
10668         if (SCTP_TSN_GT(asoc->mapping_array_base_tsn, asoc->cumulative_tsn)) {
10669                 offset = 1;
10670         } else {
10671                 offset = asoc->mapping_array_base_tsn - asoc->cumulative_tsn;
10672         }
10673         if (((type == SCTP_SELECTIVE_ACK) &&
10674             SCTP_TSN_GT(highest_tsn, asoc->cumulative_tsn)) ||
10675             ((type == SCTP_NR_SELECTIVE_ACK) &&
10676             SCTP_TSN_GT(asoc->highest_tsn_inside_map, asoc->cumulative_tsn))) {
10677                 /* we have a gap .. maybe */
10678                 for (i = 0; i < siz; i++) {
10679                         tsn_map = asoc->mapping_array[i];
10680                         if (type == SCTP_SELECTIVE_ACK) {
10681                                 tsn_map |= asoc->nr_mapping_array[i];
10682                         }
10683                         if (i == 0) {
10684                                 /*
10685                                  * Clear all bits corresponding to TSNs
10686                                  * smaller or equal to the cumulative TSN.
10687                                  */
10688                                 tsn_map &= (~0U << (1 - offset));
10689                         }
10690                         selector = &sack_array[tsn_map];
10691                         if (mergeable && selector->right_edge) {
10692                                 /*
10693                                  * Backup, left and right edges were ok to
10694                                  * merge.
10695                                  */
10696                                 num_gap_blocks--;
10697                                 gap_descriptor--;
10698                         }
10699                         if (selector->num_entries == 0)
10700                                 mergeable = 0;
10701                         else {
10702                                 for (j = 0; j < selector->num_entries; j++) {
10703                                         if (mergeable && selector->right_edge) {
10704                                                 /*
10705                                                  * do a merge by NOT setting
10706                                                  * the left side
10707                                                  */
10708                                                 mergeable = 0;
10709                                         } else {
10710                                                 /*
10711                                                  * no merge, set the left
10712                                                  * side
10713                                                  */
10714                                                 mergeable = 0;
10715                                                 gap_descriptor->start = htons((selector->gaps[j].start + offset));
10716                                         }
10717                                         gap_descriptor->end = htons((selector->gaps[j].end + offset));
10718                                         num_gap_blocks++;
10719                                         gap_descriptor++;
10720                                         if (((caddr_t)gap_descriptor + sizeof(struct sctp_gap_ack_block)) > limit) {
10721                                                 /* no more room */
10722                                                 limit_reached = 1;
10723                                                 break;
10724                                         }
10725                                 }
10726                                 if (selector->left_edge) {
10727                                         mergeable = 1;
10728                                 }
10729                         }
10730                         if (limit_reached) {
10731                                 /* Reached the limit stop */
10732                                 break;
10733                         }
10734                         offset += 8;
10735                 }
10736         }
10737         if ((type == SCTP_NR_SELECTIVE_ACK) &&
10738             (limit_reached == 0)) {
10739
10740                 mergeable = 0;
10741
10742                 if (asoc->highest_tsn_inside_nr_map > asoc->mapping_array_base_tsn) {
10743                         siz = (((asoc->highest_tsn_inside_nr_map - asoc->mapping_array_base_tsn) + 1) + 7) / 8;
10744                 } else {
10745                         siz = (((MAX_TSN - asoc->mapping_array_base_tsn) + 1) + asoc->highest_tsn_inside_nr_map + 7) / 8;
10746                 }
10747
10748                 if (SCTP_TSN_GT(asoc->mapping_array_base_tsn, asoc->cumulative_tsn)) {
10749                         offset = 1;
10750                 } else {
10751                         offset = asoc->mapping_array_base_tsn - asoc->cumulative_tsn;
10752                 }
10753                 if (SCTP_TSN_GT(asoc->highest_tsn_inside_nr_map, asoc->cumulative_tsn)) {
10754                         /* we have a gap .. maybe */
10755                         for (i = 0; i < siz; i++) {
10756                                 tsn_map = asoc->nr_mapping_array[i];
10757                                 if (i == 0) {
10758                                         /*
10759                                          * Clear all bits corresponding to
10760                                          * TSNs smaller or equal to the
10761                                          * cumulative TSN.
10762                                          */
10763                                         tsn_map &= (~0U << (1 - offset));
10764                                 }
10765                                 selector = &sack_array[tsn_map];
10766                                 if (mergeable && selector->right_edge) {
10767                                         /*
10768                                          * Backup, left and right edges were
10769                                          * ok to merge.
10770                                          */
10771                                         num_nr_gap_blocks--;
10772                                         gap_descriptor--;
10773                                 }
10774                                 if (selector->num_entries == 0)
10775                                         mergeable = 0;
10776                                 else {
10777                                         for (j = 0; j < selector->num_entries; j++) {
10778                                                 if (mergeable && selector->right_edge) {
10779                                                         /*
10780                                                          * do a merge by NOT
10781                                                          * setting the left
10782                                                          * side
10783                                                          */
10784                                                         mergeable = 0;
10785                                                 } else {
10786                                                         /*
10787                                                          * no merge, set the
10788                                                          * left side
10789                                                          */
10790                                                         mergeable = 0;
10791                                                         gap_descriptor->start = htons((selector->gaps[j].start + offset));
10792                                                 }
10793                                                 gap_descriptor->end = htons((selector->gaps[j].end + offset));
10794                                                 num_nr_gap_blocks++;
10795                                                 gap_descriptor++;
10796                                                 if (((caddr_t)gap_descriptor + sizeof(struct sctp_gap_ack_block)) > limit) {
10797                                                         /* no more room */
10798                                                         limit_reached = 1;
10799                                                         break;
10800                                                 }
10801                                         }
10802                                         if (selector->left_edge) {
10803                                                 mergeable = 1;
10804                                         }
10805                                 }
10806                                 if (limit_reached) {
10807                                         /* Reached the limit stop */
10808                                         break;
10809                                 }
10810                                 offset += 8;
10811                         }
10812                 }
10813         }
10814         /* now we must add any dups we are going to report. */
10815         if ((limit_reached == 0) && (asoc->numduptsns)) {
10816                 dup = (uint32_t *)gap_descriptor;
10817                 for (i = 0; i < asoc->numduptsns; i++) {
10818                         *dup = htonl(asoc->dup_tsns[i]);
10819                         dup++;
10820                         num_dups++;
10821                         if (((caddr_t)dup + sizeof(uint32_t)) > limit) {
10822                                 /* no more room */
10823                                 break;
10824                         }
10825                 }
10826                 asoc->numduptsns = 0;
10827         }
10828         /*
10829          * now that the chunk is prepared queue it to the control chunk
10830          * queue.
10831          */
10832         if (type == SCTP_SELECTIVE_ACK) {
10833                 a_chk->send_size = (uint16_t)(sizeof(struct sctp_sack_chunk) +
10834                     (num_gap_blocks + num_nr_gap_blocks) * sizeof(struct sctp_gap_ack_block) +
10835                     num_dups * sizeof(int32_t));
10836                 SCTP_BUF_LEN(a_chk->data) = a_chk->send_size;
10837                 sack->sack.cum_tsn_ack = htonl(asoc->cumulative_tsn);
10838                 sack->sack.a_rwnd = htonl(asoc->my_rwnd);
10839                 sack->sack.num_gap_ack_blks = htons(num_gap_blocks);
10840                 sack->sack.num_dup_tsns = htons(num_dups);
10841                 sack->ch.chunk_type = type;
10842                 sack->ch.chunk_flags = flags;
10843                 sack->ch.chunk_length = htons(a_chk->send_size);
10844         } else {
10845                 a_chk->send_size = (uint16_t)(sizeof(struct sctp_nr_sack_chunk) +
10846                     (num_gap_blocks + num_nr_gap_blocks) * sizeof(struct sctp_gap_ack_block) +
10847                     num_dups * sizeof(int32_t));
10848                 SCTP_BUF_LEN(a_chk->data) = a_chk->send_size;
10849                 nr_sack->nr_sack.cum_tsn_ack = htonl(asoc->cumulative_tsn);
10850                 nr_sack->nr_sack.a_rwnd = htonl(asoc->my_rwnd);
10851                 nr_sack->nr_sack.num_gap_ack_blks = htons(num_gap_blocks);
10852                 nr_sack->nr_sack.num_nr_gap_ack_blks = htons(num_nr_gap_blocks);
10853                 nr_sack->nr_sack.num_dup_tsns = htons(num_dups);
10854                 nr_sack->nr_sack.reserved = 0;
10855                 nr_sack->ch.chunk_type = type;
10856                 nr_sack->ch.chunk_flags = flags;
10857                 nr_sack->ch.chunk_length = htons(a_chk->send_size);
10858         }
10859         TAILQ_INSERT_TAIL(&asoc->control_send_queue, a_chk, sctp_next);
10860         asoc->my_last_reported_rwnd = asoc->my_rwnd;
10861         asoc->ctrl_queue_cnt++;
10862         asoc->send_sack = 0;
10863         SCTP_STAT_INCR(sctps_sendsacks);
10864         return;
10865 }
10866
10867 void
10868 sctp_send_abort_tcb(struct sctp_tcb *stcb, struct mbuf *operr, int so_locked
10869 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
10870     SCTP_UNUSED
10871 #endif
10872 )
10873 {
10874         struct mbuf *m_abort, *m, *m_last;
10875         struct mbuf *m_out, *m_end = NULL;
10876         struct sctp_abort_chunk *abort;
10877         struct sctp_auth_chunk *auth = NULL;
10878         struct sctp_nets *net;
10879         uint32_t vtag;
10880         uint32_t auth_offset = 0;
10881         int error;
10882         uint16_t cause_len, chunk_len, padding_len;
10883
10884         SCTP_TCB_LOCK_ASSERT(stcb);
10885         /*-
10886          * Add an AUTH chunk, if chunk requires it and save the offset into
10887          * the chain for AUTH
10888          */
10889         if (sctp_auth_is_required_chunk(SCTP_ABORT_ASSOCIATION,
10890             stcb->asoc.peer_auth_chunks)) {
10891                 m_out = sctp_add_auth_chunk(NULL, &m_end, &auth, &auth_offset,
10892                     stcb, SCTP_ABORT_ASSOCIATION);
10893                 SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
10894         } else {
10895                 m_out = NULL;
10896         }
10897         m_abort = sctp_get_mbuf_for_msg(sizeof(struct sctp_abort_chunk), 0, M_NOWAIT, 1, MT_HEADER);
10898         if (m_abort == NULL) {
10899                 if (m_out) {
10900                         sctp_m_freem(m_out);
10901                 }
10902                 if (operr) {
10903                         sctp_m_freem(operr);
10904                 }
10905                 return;
10906         }
10907         /* link in any error */
10908         SCTP_BUF_NEXT(m_abort) = operr;
10909         cause_len = 0;
10910         m_last = NULL;
10911         for (m = operr; m; m = SCTP_BUF_NEXT(m)) {
10912                 cause_len += (uint16_t)SCTP_BUF_LEN(m);
10913                 if (SCTP_BUF_NEXT(m) == NULL) {
10914                         m_last = m;
10915                 }
10916         }
10917         SCTP_BUF_LEN(m_abort) = sizeof(struct sctp_abort_chunk);
10918         chunk_len = (uint16_t)sizeof(struct sctp_abort_chunk) + cause_len;
10919         padding_len = SCTP_SIZE32(chunk_len) - chunk_len;
10920         if (m_out == NULL) {
10921                 /* NO Auth chunk prepended, so reserve space in front */
10922                 SCTP_BUF_RESV_UF(m_abort, SCTP_MIN_OVERHEAD);
10923                 m_out = m_abort;
10924         } else {
10925                 /* Put AUTH chunk at the front of the chain */
10926                 SCTP_BUF_NEXT(m_end) = m_abort;
10927         }
10928         if (stcb->asoc.alternate) {
10929                 net = stcb->asoc.alternate;
10930         } else {
10931                 net = stcb->asoc.primary_destination;
10932         }
10933         /* Fill in the ABORT chunk header. */
10934         abort = mtod(m_abort, struct sctp_abort_chunk *);
10935         abort->ch.chunk_type = SCTP_ABORT_ASSOCIATION;
10936         if (stcb->asoc.peer_vtag == 0) {
10937                 /* This happens iff the assoc is in COOKIE-WAIT state. */
10938                 vtag = stcb->asoc.my_vtag;
10939                 abort->ch.chunk_flags = SCTP_HAD_NO_TCB;
10940         } else {
10941                 vtag = stcb->asoc.peer_vtag;
10942                 abort->ch.chunk_flags = 0;
10943         }
10944         abort->ch.chunk_length = htons(chunk_len);
10945         /* Add padding, if necessary. */
10946         if (padding_len > 0) {
10947                 if ((m_last == NULL) ||
10948                     (sctp_add_pad_tombuf(m_last, padding_len) == NULL)) {
10949                         sctp_m_freem(m_out);
10950                         return;
10951                 }
10952         }
10953         if ((error = sctp_lowlevel_chunk_output(stcb->sctp_ep, stcb, net,
10954             (struct sockaddr *)&net->ro._l_addr,
10955             m_out, auth_offset, auth, stcb->asoc.authinfo.active_keyid, 1, 0, 0,
10956             stcb->sctp_ep->sctp_lport, stcb->rport, htonl(vtag),
10957             stcb->asoc.primary_destination->port, NULL,
10958             0, 0,
10959             so_locked))) {
10960                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
10961                 if (error == ENOBUFS) {
10962                         stcb->asoc.ifp_had_enobuf = 1;
10963                         SCTP_STAT_INCR(sctps_lowlevelerr);
10964                 }
10965         } else {
10966                 stcb->asoc.ifp_had_enobuf = 0;
10967         }
10968         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
10969 }
10970
10971 void
10972 sctp_send_shutdown_complete(struct sctp_tcb *stcb,
10973     struct sctp_nets *net,
10974     int reflect_vtag)
10975 {
10976         /* formulate and SEND a SHUTDOWN-COMPLETE */
10977         struct mbuf *m_shutdown_comp;
10978         struct sctp_shutdown_complete_chunk *shutdown_complete;
10979         uint32_t vtag;
10980         int error;
10981         uint8_t flags;
10982
10983         m_shutdown_comp = sctp_get_mbuf_for_msg(sizeof(struct sctp_chunkhdr), 0, M_NOWAIT, 1, MT_HEADER);
10984         if (m_shutdown_comp == NULL) {
10985                 /* no mbuf's */
10986                 return;
10987         }
10988         if (reflect_vtag) {
10989                 flags = SCTP_HAD_NO_TCB;
10990                 vtag = stcb->asoc.my_vtag;
10991         } else {
10992                 flags = 0;
10993                 vtag = stcb->asoc.peer_vtag;
10994         }
10995         shutdown_complete = mtod(m_shutdown_comp, struct sctp_shutdown_complete_chunk *);
10996         shutdown_complete->ch.chunk_type = SCTP_SHUTDOWN_COMPLETE;
10997         shutdown_complete->ch.chunk_flags = flags;
10998         shutdown_complete->ch.chunk_length = htons(sizeof(struct sctp_shutdown_complete_chunk));
10999         SCTP_BUF_LEN(m_shutdown_comp) = sizeof(struct sctp_shutdown_complete_chunk);
11000         if ((error = sctp_lowlevel_chunk_output(stcb->sctp_ep, stcb, net,
11001             (struct sockaddr *)&net->ro._l_addr,
11002             m_shutdown_comp, 0, NULL, 0, 1, 0, 0,
11003             stcb->sctp_ep->sctp_lport, stcb->rport,
11004             htonl(vtag),
11005             net->port, NULL,
11006             0, 0,
11007             SCTP_SO_NOT_LOCKED))) {
11008                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
11009                 if (error == ENOBUFS) {
11010                         stcb->asoc.ifp_had_enobuf = 1;
11011                         SCTP_STAT_INCR(sctps_lowlevelerr);
11012                 }
11013         } else {
11014                 stcb->asoc.ifp_had_enobuf = 0;
11015         }
11016         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
11017         return;
11018 }
11019
11020 static void
11021 sctp_send_resp_msg(struct sockaddr *src, struct sockaddr *dst,
11022     struct sctphdr *sh, uint32_t vtag,
11023     uint8_t type, struct mbuf *cause,
11024     uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum,
11025     uint32_t vrf_id, uint16_t port)
11026 {
11027         struct mbuf *o_pak;
11028         struct mbuf *mout;
11029         struct sctphdr *shout;
11030         struct sctp_chunkhdr *ch;
11031 #if defined(INET) || defined(INET6)
11032         struct udphdr *udp;
11033         int ret;
11034 #endif
11035         int len, cause_len, padding_len;
11036 #ifdef INET
11037         struct sockaddr_in *src_sin, *dst_sin;
11038         struct ip *ip;
11039 #endif
11040 #ifdef INET6
11041         struct sockaddr_in6 *src_sin6, *dst_sin6;
11042         struct ip6_hdr *ip6;
11043 #endif
11044
11045         /* Compute the length of the cause and add final padding. */
11046         cause_len = 0;
11047         if (cause != NULL) {
11048                 struct mbuf *m_at, *m_last = NULL;
11049
11050                 for (m_at = cause; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
11051                         if (SCTP_BUF_NEXT(m_at) == NULL)
11052                                 m_last = m_at;
11053                         cause_len += SCTP_BUF_LEN(m_at);
11054                 }
11055                 padding_len = cause_len % 4;
11056                 if (padding_len != 0) {
11057                         padding_len = 4 - padding_len;
11058                 }
11059                 if (padding_len != 0) {
11060                         if (sctp_add_pad_tombuf(m_last, padding_len) == NULL) {
11061                                 sctp_m_freem(cause);
11062                                 return;
11063                         }
11064                 }
11065         } else {
11066                 padding_len = 0;
11067         }
11068         /* Get an mbuf for the header. */
11069         len = sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
11070         switch (dst->sa_family) {
11071 #ifdef INET
11072         case AF_INET:
11073                 len += sizeof(struct ip);
11074                 break;
11075 #endif
11076 #ifdef INET6
11077         case AF_INET6:
11078                 len += sizeof(struct ip6_hdr);
11079                 break;
11080 #endif
11081         default:
11082                 break;
11083         }
11084 #if defined(INET) || defined(INET6)
11085         if (port) {
11086                 len += sizeof(struct udphdr);
11087         }
11088 #endif
11089         mout = sctp_get_mbuf_for_msg(len + max_linkhdr, 1, M_NOWAIT, 1, MT_DATA);
11090         if (mout == NULL) {
11091                 if (cause) {
11092                         sctp_m_freem(cause);
11093                 }
11094                 return;
11095         }
11096         SCTP_BUF_RESV_UF(mout, max_linkhdr);
11097         SCTP_BUF_LEN(mout) = len;
11098         SCTP_BUF_NEXT(mout) = cause;
11099         M_SETFIB(mout, fibnum);
11100         mout->m_pkthdr.flowid = mflowid;
11101         M_HASHTYPE_SET(mout, mflowtype);
11102 #ifdef INET
11103         ip = NULL;
11104 #endif
11105 #ifdef INET6
11106         ip6 = NULL;
11107 #endif
11108         switch (dst->sa_family) {
11109 #ifdef INET
11110         case AF_INET:
11111                 src_sin = (struct sockaddr_in *)src;
11112                 dst_sin = (struct sockaddr_in *)dst;
11113                 ip = mtod(mout, struct ip *);
11114                 ip->ip_v = IPVERSION;
11115                 ip->ip_hl = (sizeof(struct ip) >> 2);
11116                 ip->ip_tos = 0;
11117                 ip->ip_off = htons(IP_DF);
11118                 ip_fillid(ip);
11119                 ip->ip_ttl = MODULE_GLOBAL(ip_defttl);
11120                 if (port) {
11121                         ip->ip_p = IPPROTO_UDP;
11122                 } else {
11123                         ip->ip_p = IPPROTO_SCTP;
11124                 }
11125                 ip->ip_src.s_addr = dst_sin->sin_addr.s_addr;
11126                 ip->ip_dst.s_addr = src_sin->sin_addr.s_addr;
11127                 ip->ip_sum = 0;
11128                 len = sizeof(struct ip);
11129                 shout = (struct sctphdr *)((caddr_t)ip + len);
11130                 break;
11131 #endif
11132 #ifdef INET6
11133         case AF_INET6:
11134                 src_sin6 = (struct sockaddr_in6 *)src;
11135                 dst_sin6 = (struct sockaddr_in6 *)dst;
11136                 ip6 = mtod(mout, struct ip6_hdr *);
11137                 ip6->ip6_flow = htonl(0x60000000);
11138                 if (V_ip6_auto_flowlabel) {
11139                         ip6->ip6_flow |= (htonl(ip6_randomflowlabel()) & IPV6_FLOWLABEL_MASK);
11140                 }
11141                 ip6->ip6_hlim = MODULE_GLOBAL(ip6_defhlim);
11142                 if (port) {
11143                         ip6->ip6_nxt = IPPROTO_UDP;
11144                 } else {
11145                         ip6->ip6_nxt = IPPROTO_SCTP;
11146                 }
11147                 ip6->ip6_src = dst_sin6->sin6_addr;
11148                 ip6->ip6_dst = src_sin6->sin6_addr;
11149                 len = sizeof(struct ip6_hdr);
11150                 shout = (struct sctphdr *)((caddr_t)ip6 + len);
11151                 break;
11152 #endif
11153         default:
11154                 len = 0;
11155                 shout = mtod(mout, struct sctphdr *);
11156                 break;
11157         }
11158 #if defined(INET) || defined(INET6)
11159         if (port) {
11160                 if (htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port)) == 0) {
11161                         sctp_m_freem(mout);
11162                         return;
11163                 }
11164                 udp = (struct udphdr *)shout;
11165                 udp->uh_sport = htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port));
11166                 udp->uh_dport = port;
11167                 udp->uh_sum = 0;
11168                 udp->uh_ulen = htons((uint16_t)(sizeof(struct udphdr) +
11169                     sizeof(struct sctphdr) +
11170                     sizeof(struct sctp_chunkhdr) +
11171                     cause_len + padding_len));
11172                 len += sizeof(struct udphdr);
11173                 shout = (struct sctphdr *)((caddr_t)shout + sizeof(struct udphdr));
11174         } else {
11175                 udp = NULL;
11176         }
11177 #endif
11178         shout->src_port = sh->dest_port;
11179         shout->dest_port = sh->src_port;
11180         shout->checksum = 0;
11181         if (vtag) {
11182                 shout->v_tag = htonl(vtag);
11183         } else {
11184                 shout->v_tag = sh->v_tag;
11185         }
11186         len += sizeof(struct sctphdr);
11187         ch = (struct sctp_chunkhdr *)((caddr_t)shout + sizeof(struct sctphdr));
11188         ch->chunk_type = type;
11189         if (vtag) {
11190                 ch->chunk_flags = 0;
11191         } else {
11192                 ch->chunk_flags = SCTP_HAD_NO_TCB;
11193         }
11194         ch->chunk_length = htons((uint16_t)(sizeof(struct sctp_chunkhdr) + cause_len));
11195         len += sizeof(struct sctp_chunkhdr);
11196         len += cause_len + padding_len;
11197
11198         if (SCTP_GET_HEADER_FOR_OUTPUT(o_pak)) {
11199                 sctp_m_freem(mout);
11200                 return;
11201         }
11202         SCTP_ATTACH_CHAIN(o_pak, mout, len);
11203         switch (dst->sa_family) {
11204 #ifdef INET
11205         case AF_INET:
11206                 if (port) {
11207                         if (V_udp_cksum) {
11208                                 udp->uh_sum = in_pseudo(ip->ip_src.s_addr, ip->ip_dst.s_addr, udp->uh_ulen + htons(IPPROTO_UDP));
11209                         } else {
11210                                 udp->uh_sum = 0;
11211                         }
11212                 }
11213                 ip->ip_len = htons(len);
11214                 if (port) {
11215                         shout->checksum = sctp_calculate_cksum(mout, sizeof(struct ip) + sizeof(struct udphdr));
11216                         SCTP_STAT_INCR(sctps_sendswcrc);
11217                         if (V_udp_cksum) {
11218                                 SCTP_ENABLE_UDP_CSUM(o_pak);
11219                         }
11220                 } else {
11221                         mout->m_pkthdr.csum_flags = CSUM_SCTP;
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_IP_OUTPUT(ret, o_pak, NULL, NULL, vrf_id);
11231                 break;
11232 #endif
11233 #ifdef INET6
11234         case AF_INET6:
11235                 ip6->ip6_plen = (uint16_t)(len - sizeof(struct ip6_hdr));
11236                 if (port) {
11237                         shout->checksum = sctp_calculate_cksum(mout, sizeof(struct ip6_hdr) + sizeof(struct udphdr));
11238                         SCTP_STAT_INCR(sctps_sendswcrc);
11239                         if ((udp->uh_sum = in6_cksum(o_pak, IPPROTO_UDP, sizeof(struct ip6_hdr), len - sizeof(struct ip6_hdr))) == 0) {
11240                                 udp->uh_sum = 0xffff;
11241                         }
11242                 } else {
11243                         mout->m_pkthdr.csum_flags = CSUM_SCTP_IPV6;
11244                         mout->m_pkthdr.csum_data = offsetof(struct sctphdr, checksum);
11245                         SCTP_STAT_INCR(sctps_sendhwcrc);
11246                 }
11247 #ifdef SCTP_PACKET_LOGGING
11248                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING) {
11249                         sctp_packet_log(o_pak);
11250                 }
11251 #endif
11252                 SCTP_IP6_OUTPUT(ret, o_pak, NULL, NULL, NULL, vrf_id);
11253                 break;
11254 #endif
11255         default:
11256                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Unknown protocol (TSNH) type %d\n",
11257                     dst->sa_family);
11258                 sctp_m_freem(mout);
11259                 SCTP_LTRACE_ERR_RET_PKT(mout, NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EFAULT);
11260                 return;
11261         }
11262         SCTP_STAT_INCR(sctps_sendpackets);
11263         SCTP_STAT_INCR_COUNTER64(sctps_outpackets);
11264         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
11265         return;
11266 }
11267
11268 void
11269 sctp_send_shutdown_complete2(struct sockaddr *src, struct sockaddr *dst,
11270     struct sctphdr *sh,
11271     uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum,
11272     uint32_t vrf_id, uint16_t port)
11273 {
11274         sctp_send_resp_msg(src, dst, sh, 0, SCTP_SHUTDOWN_COMPLETE, NULL,
11275             mflowtype, mflowid, fibnum,
11276             vrf_id, port);
11277 }
11278
11279 void
11280 sctp_send_hb(struct sctp_tcb *stcb, struct sctp_nets *net, int so_locked
11281 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
11282     SCTP_UNUSED
11283 #endif
11284 )
11285 {
11286         struct sctp_tmit_chunk *chk;
11287         struct sctp_heartbeat_chunk *hb;
11288         struct timeval now;
11289
11290         SCTP_TCB_LOCK_ASSERT(stcb);
11291         if (net == NULL) {
11292                 return;
11293         }
11294         (void)SCTP_GETTIME_TIMEVAL(&now);
11295         switch (net->ro._l_addr.sa.sa_family) {
11296 #ifdef INET
11297         case AF_INET:
11298                 break;
11299 #endif
11300 #ifdef INET6
11301         case AF_INET6:
11302                 break;
11303 #endif
11304         default:
11305                 return;
11306         }
11307         sctp_alloc_a_chunk(stcb, chk);
11308         if (chk == NULL) {
11309                 SCTPDBG(SCTP_DEBUG_OUTPUT4, "Gak, can't get a chunk for hb\n");
11310                 return;
11311         }
11312         chk->copy_by_ref = 0;
11313         chk->rec.chunk_id.id = SCTP_HEARTBEAT_REQUEST;
11314         chk->rec.chunk_id.can_take_data = 1;
11315         chk->flags = 0;
11316         chk->asoc = &stcb->asoc;
11317         chk->send_size = sizeof(struct sctp_heartbeat_chunk);
11318
11319         chk->data = sctp_get_mbuf_for_msg(chk->send_size, 0, M_NOWAIT, 1, MT_HEADER);
11320         if (chk->data == NULL) {
11321                 sctp_free_a_chunk(stcb, chk, so_locked);
11322                 return;
11323         }
11324         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11325         SCTP_BUF_LEN(chk->data) = chk->send_size;
11326         chk->sent = SCTP_DATAGRAM_UNSENT;
11327         chk->snd_count = 0;
11328         chk->whoTo = net;
11329         atomic_add_int(&chk->whoTo->ref_count, 1);
11330         /* Now we have a mbuf that we can fill in with the details */
11331         hb = mtod(chk->data, struct sctp_heartbeat_chunk *);
11332         memset(hb, 0, sizeof(struct sctp_heartbeat_chunk));
11333         /* fill out chunk header */
11334         hb->ch.chunk_type = SCTP_HEARTBEAT_REQUEST;
11335         hb->ch.chunk_flags = 0;
11336         hb->ch.chunk_length = htons(chk->send_size);
11337         /* Fill out hb parameter */
11338         hb->heartbeat.hb_info.ph.param_type = htons(SCTP_HEARTBEAT_INFO);
11339         hb->heartbeat.hb_info.ph.param_length = htons(sizeof(struct sctp_heartbeat_info_param));
11340         hb->heartbeat.hb_info.time_value_1 = now.tv_sec;
11341         hb->heartbeat.hb_info.time_value_2 = now.tv_usec;
11342         /* Did our user request this one, put it in */
11343         hb->heartbeat.hb_info.addr_family = (uint8_t)net->ro._l_addr.sa.sa_family;
11344         hb->heartbeat.hb_info.addr_len = net->ro._l_addr.sa.sa_len;
11345         if (net->dest_state & SCTP_ADDR_UNCONFIRMED) {
11346                 /*
11347                  * we only take from the entropy pool if the address is not
11348                  * confirmed.
11349                  */
11350                 net->heartbeat_random1 = hb->heartbeat.hb_info.random_value1 = sctp_select_initial_TSN(&stcb->sctp_ep->sctp_ep);
11351                 net->heartbeat_random2 = hb->heartbeat.hb_info.random_value2 = sctp_select_initial_TSN(&stcb->sctp_ep->sctp_ep);
11352         } else {
11353                 net->heartbeat_random1 = hb->heartbeat.hb_info.random_value1 = 0;
11354                 net->heartbeat_random2 = hb->heartbeat.hb_info.random_value2 = 0;
11355         }
11356         switch (net->ro._l_addr.sa.sa_family) {
11357 #ifdef INET
11358         case AF_INET:
11359                 memcpy(hb->heartbeat.hb_info.address,
11360                     &net->ro._l_addr.sin.sin_addr,
11361                     sizeof(net->ro._l_addr.sin.sin_addr));
11362                 break;
11363 #endif
11364 #ifdef INET6
11365         case AF_INET6:
11366                 memcpy(hb->heartbeat.hb_info.address,
11367                     &net->ro._l_addr.sin6.sin6_addr,
11368                     sizeof(net->ro._l_addr.sin6.sin6_addr));
11369                 break;
11370 #endif
11371         default:
11372                 if (chk->data) {
11373                         sctp_m_freem(chk->data);
11374                         chk->data = NULL;
11375                 }
11376                 sctp_free_a_chunk(stcb, chk, so_locked);
11377                 return;
11378                 break;
11379         }
11380         net->hb_responded = 0;
11381         TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
11382         stcb->asoc.ctrl_queue_cnt++;
11383         SCTP_STAT_INCR(sctps_sendheartbeat);
11384         return;
11385 }
11386
11387 void
11388 sctp_send_ecn_echo(struct sctp_tcb *stcb, struct sctp_nets *net,
11389     uint32_t high_tsn)
11390 {
11391         struct sctp_association *asoc;
11392         struct sctp_ecne_chunk *ecne;
11393         struct sctp_tmit_chunk *chk;
11394
11395         if (net == NULL) {
11396                 return;
11397         }
11398         asoc = &stcb->asoc;
11399         SCTP_TCB_LOCK_ASSERT(stcb);
11400         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
11401                 if ((chk->rec.chunk_id.id == SCTP_ECN_ECHO) && (net == chk->whoTo)) {
11402                         /* found a previous ECN_ECHO update it if needed */
11403                         uint32_t cnt, ctsn;
11404
11405                         ecne = mtod(chk->data, struct sctp_ecne_chunk *);
11406                         ctsn = ntohl(ecne->tsn);
11407                         if (SCTP_TSN_GT(high_tsn, ctsn)) {
11408                                 ecne->tsn = htonl(high_tsn);
11409                                 SCTP_STAT_INCR(sctps_queue_upd_ecne);
11410                         }
11411                         cnt = ntohl(ecne->num_pkts_since_cwr);
11412                         cnt++;
11413                         ecne->num_pkts_since_cwr = htonl(cnt);
11414                         return;
11415                 }
11416         }
11417         /* nope could not find one to update so we must build one */
11418         sctp_alloc_a_chunk(stcb, chk);
11419         if (chk == NULL) {
11420                 return;
11421         }
11422         SCTP_STAT_INCR(sctps_queue_upd_ecne);
11423         chk->copy_by_ref = 0;
11424         chk->rec.chunk_id.id = SCTP_ECN_ECHO;
11425         chk->rec.chunk_id.can_take_data = 0;
11426         chk->flags = 0;
11427         chk->asoc = &stcb->asoc;
11428         chk->send_size = sizeof(struct sctp_ecne_chunk);
11429         chk->data = sctp_get_mbuf_for_msg(chk->send_size, 0, M_NOWAIT, 1, MT_HEADER);
11430         if (chk->data == NULL) {
11431                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
11432                 return;
11433         }
11434         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11435         SCTP_BUF_LEN(chk->data) = chk->send_size;
11436         chk->sent = SCTP_DATAGRAM_UNSENT;
11437         chk->snd_count = 0;
11438         chk->whoTo = net;
11439         atomic_add_int(&chk->whoTo->ref_count, 1);
11440
11441         stcb->asoc.ecn_echo_cnt_onq++;
11442         ecne = mtod(chk->data, struct sctp_ecne_chunk *);
11443         ecne->ch.chunk_type = SCTP_ECN_ECHO;
11444         ecne->ch.chunk_flags = 0;
11445         ecne->ch.chunk_length = htons(sizeof(struct sctp_ecne_chunk));
11446         ecne->tsn = htonl(high_tsn);
11447         ecne->num_pkts_since_cwr = htonl(1);
11448         TAILQ_INSERT_HEAD(&stcb->asoc.control_send_queue, chk, sctp_next);
11449         asoc->ctrl_queue_cnt++;
11450 }
11451
11452 void
11453 sctp_send_packet_dropped(struct sctp_tcb *stcb, struct sctp_nets *net,
11454     struct mbuf *m, int len, int iphlen, int bad_crc)
11455 {
11456         struct sctp_association *asoc;
11457         struct sctp_pktdrop_chunk *drp;
11458         struct sctp_tmit_chunk *chk;
11459         uint8_t *datap;
11460         int was_trunc = 0;
11461         int fullsz = 0;
11462         long spc;
11463         int offset;
11464         struct sctp_chunkhdr *ch, chunk_buf;
11465         unsigned int chk_length;
11466
11467         if (!stcb) {
11468                 return;
11469         }
11470         asoc = &stcb->asoc;
11471         SCTP_TCB_LOCK_ASSERT(stcb);
11472         if (asoc->pktdrop_supported == 0) {
11473                 /*-
11474                  * peer must declare support before I send one.
11475                  */
11476                 return;
11477         }
11478         if (stcb->sctp_socket == NULL) {
11479                 return;
11480         }
11481         sctp_alloc_a_chunk(stcb, chk);
11482         if (chk == NULL) {
11483                 return;
11484         }
11485         chk->copy_by_ref = 0;
11486         chk->rec.chunk_id.id = SCTP_PACKET_DROPPED;
11487         chk->rec.chunk_id.can_take_data = 1;
11488         chk->flags = 0;
11489         len -= iphlen;
11490         chk->send_size = len;
11491         /* Validate that we do not have an ABORT in here. */
11492         offset = iphlen + sizeof(struct sctphdr);
11493         ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, offset,
11494             sizeof(*ch), (uint8_t *)&chunk_buf);
11495         while (ch != NULL) {
11496                 chk_length = ntohs(ch->chunk_length);
11497                 if (chk_length < sizeof(*ch)) {
11498                         /* break to abort land */
11499                         break;
11500                 }
11501                 switch (ch->chunk_type) {
11502                 case SCTP_PACKET_DROPPED:
11503                 case SCTP_ABORT_ASSOCIATION:
11504                 case SCTP_INITIATION_ACK:
11505                         /**
11506                          * We don't respond with an PKT-DROP to an ABORT
11507                          * or PKT-DROP. We also do not respond to an
11508                          * INIT-ACK, because we can't know if the initiation
11509                          * tag is correct or not.
11510                          */
11511                         sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
11512                         return;
11513                 default:
11514                         break;
11515                 }
11516                 offset += SCTP_SIZE32(chk_length);
11517                 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, offset,
11518                     sizeof(*ch), (uint8_t *)&chunk_buf);
11519         }
11520
11521         if ((len + SCTP_MAX_OVERHEAD + sizeof(struct sctp_pktdrop_chunk)) >
11522             min(stcb->asoc.smallest_mtu, MCLBYTES)) {
11523                 /*
11524                  * only send 1 mtu worth, trim off the excess on the end.
11525                  */
11526                 fullsz = len;
11527                 len = min(stcb->asoc.smallest_mtu, MCLBYTES) - SCTP_MAX_OVERHEAD;
11528                 was_trunc = 1;
11529         }
11530         chk->asoc = &stcb->asoc;
11531         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
11532         if (chk->data == NULL) {
11533 jump_out:
11534                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
11535                 return;
11536         }
11537         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11538         drp = mtod(chk->data, struct sctp_pktdrop_chunk *);
11539         if (drp == NULL) {
11540                 sctp_m_freem(chk->data);
11541                 chk->data = NULL;
11542                 goto jump_out;
11543         }
11544         chk->book_size = SCTP_SIZE32((chk->send_size + sizeof(struct sctp_pktdrop_chunk) +
11545             sizeof(struct sctphdr) + SCTP_MED_OVERHEAD));
11546         chk->book_size_scale = 0;
11547         if (was_trunc) {
11548                 drp->ch.chunk_flags = SCTP_PACKET_TRUNCATED;
11549                 drp->trunc_len = htons(fullsz);
11550                 /*
11551                  * Len is already adjusted to size minus overhead above take
11552                  * out the pkt_drop chunk itself from it.
11553                  */
11554                 chk->send_size = (uint16_t)(len - sizeof(struct sctp_pktdrop_chunk));
11555                 len = chk->send_size;
11556         } else {
11557                 /* no truncation needed */
11558                 drp->ch.chunk_flags = 0;
11559                 drp->trunc_len = htons(0);
11560         }
11561         if (bad_crc) {
11562                 drp->ch.chunk_flags |= SCTP_BADCRC;
11563         }
11564         chk->send_size += sizeof(struct sctp_pktdrop_chunk);
11565         SCTP_BUF_LEN(chk->data) = chk->send_size;
11566         chk->sent = SCTP_DATAGRAM_UNSENT;
11567         chk->snd_count = 0;
11568         if (net) {
11569                 /* we should hit here */
11570                 chk->whoTo = net;
11571                 atomic_add_int(&chk->whoTo->ref_count, 1);
11572         } else {
11573                 chk->whoTo = NULL;
11574         }
11575         drp->ch.chunk_type = SCTP_PACKET_DROPPED;
11576         drp->ch.chunk_length = htons(chk->send_size);
11577         spc = SCTP_SB_LIMIT_RCV(stcb->sctp_socket);
11578         if (spc < 0) {
11579                 spc = 0;
11580         }
11581         drp->bottle_bw = htonl(spc);
11582         if (asoc->my_rwnd) {
11583                 drp->current_onq = htonl(asoc->size_on_reasm_queue +
11584                     asoc->size_on_all_streams +
11585                     asoc->my_rwnd_control_len +
11586                     stcb->sctp_socket->so_rcv.sb_cc);
11587         } else {
11588                 /*-
11589                  * If my rwnd is 0, possibly from mbuf depletion as well as
11590                  * space used, tell the peer there is NO space aka onq == bw
11591                  */
11592                 drp->current_onq = htonl(spc);
11593         }
11594         drp->reserved = 0;
11595         datap = drp->data;
11596         m_copydata(m, iphlen, len, (caddr_t)datap);
11597         TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
11598         asoc->ctrl_queue_cnt++;
11599 }
11600
11601 void
11602 sctp_send_cwr(struct sctp_tcb *stcb, struct sctp_nets *net, uint32_t high_tsn, uint8_t override)
11603 {
11604         struct sctp_association *asoc;
11605         struct sctp_cwr_chunk *cwr;
11606         struct sctp_tmit_chunk *chk;
11607
11608         SCTP_TCB_LOCK_ASSERT(stcb);
11609         if (net == NULL) {
11610                 return;
11611         }
11612         asoc = &stcb->asoc;
11613         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
11614                 if ((chk->rec.chunk_id.id == SCTP_ECN_CWR) && (net == chk->whoTo)) {
11615                         /*
11616                          * found a previous CWR queued to same destination
11617                          * update it if needed
11618                          */
11619                         uint32_t ctsn;
11620
11621                         cwr = mtod(chk->data, struct sctp_cwr_chunk *);
11622                         ctsn = ntohl(cwr->tsn);
11623                         if (SCTP_TSN_GT(high_tsn, ctsn)) {
11624                                 cwr->tsn = htonl(high_tsn);
11625                         }
11626                         if (override & SCTP_CWR_REDUCE_OVERRIDE) {
11627                                 /* Make sure override is carried */
11628                                 cwr->ch.chunk_flags |= SCTP_CWR_REDUCE_OVERRIDE;
11629                         }
11630                         return;
11631                 }
11632         }
11633         sctp_alloc_a_chunk(stcb, chk);
11634         if (chk == NULL) {
11635                 return;
11636         }
11637         chk->copy_by_ref = 0;
11638         chk->rec.chunk_id.id = SCTP_ECN_CWR;
11639         chk->rec.chunk_id.can_take_data = 1;
11640         chk->flags = 0;
11641         chk->asoc = &stcb->asoc;
11642         chk->send_size = sizeof(struct sctp_cwr_chunk);
11643         chk->data = sctp_get_mbuf_for_msg(chk->send_size, 0, M_NOWAIT, 1, MT_HEADER);
11644         if (chk->data == NULL) {
11645                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
11646                 return;
11647         }
11648         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11649         SCTP_BUF_LEN(chk->data) = chk->send_size;
11650         chk->sent = SCTP_DATAGRAM_UNSENT;
11651         chk->snd_count = 0;
11652         chk->whoTo = net;
11653         atomic_add_int(&chk->whoTo->ref_count, 1);
11654         cwr = mtod(chk->data, struct sctp_cwr_chunk *);
11655         cwr->ch.chunk_type = SCTP_ECN_CWR;
11656         cwr->ch.chunk_flags = override;
11657         cwr->ch.chunk_length = htons(sizeof(struct sctp_cwr_chunk));
11658         cwr->tsn = htonl(high_tsn);
11659         TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
11660         asoc->ctrl_queue_cnt++;
11661 }
11662
11663 static int
11664 sctp_add_stream_reset_out(struct sctp_tcb *stcb, struct sctp_tmit_chunk *chk,
11665     uint32_t seq, uint32_t resp_seq, uint32_t last_sent)
11666 {
11667         uint16_t len, old_len, i;
11668         struct sctp_stream_reset_out_request *req_out;
11669         struct sctp_chunkhdr *ch;
11670         int at;
11671         int number_entries = 0;
11672
11673         ch = mtod(chk->data, struct sctp_chunkhdr *);
11674         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11675         /* get to new offset for the param. */
11676         req_out = (struct sctp_stream_reset_out_request *)((caddr_t)ch + len);
11677         /* now how long will this param be? */
11678         for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
11679                 if ((stcb->asoc.strmout[i].state == SCTP_STREAM_RESET_PENDING) &&
11680                     (stcb->asoc.strmout[i].chunks_on_queues == 0) &&
11681                     TAILQ_EMPTY(&stcb->asoc.strmout[i].outqueue)) {
11682                         number_entries++;
11683                 }
11684         }
11685         if (number_entries == 0) {
11686                 return (0);
11687         }
11688         if (number_entries == stcb->asoc.streamoutcnt) {
11689                 number_entries = 0;
11690         }
11691         if (number_entries > SCTP_MAX_STREAMS_AT_ONCE_RESET) {
11692                 number_entries = SCTP_MAX_STREAMS_AT_ONCE_RESET;
11693         }
11694         len = (uint16_t)(sizeof(struct sctp_stream_reset_out_request) + (sizeof(uint16_t) * number_entries));
11695         req_out->ph.param_type = htons(SCTP_STR_RESET_OUT_REQUEST);
11696         req_out->ph.param_length = htons(len);
11697         req_out->request_seq = htonl(seq);
11698         req_out->response_seq = htonl(resp_seq);
11699         req_out->send_reset_at_tsn = htonl(last_sent);
11700         at = 0;
11701         if (number_entries) {
11702                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
11703                         if ((stcb->asoc.strmout[i].state == SCTP_STREAM_RESET_PENDING) &&
11704                             (stcb->asoc.strmout[i].chunks_on_queues == 0) &&
11705                             TAILQ_EMPTY(&stcb->asoc.strmout[i].outqueue)) {
11706                                 req_out->list_of_streams[at] = htons(i);
11707                                 at++;
11708                                 stcb->asoc.strmout[i].state = SCTP_STREAM_RESET_IN_FLIGHT;
11709                                 if (at >= number_entries) {
11710                                         break;
11711                                 }
11712                         }
11713                 }
11714         } else {
11715                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
11716                         stcb->asoc.strmout[i].state = SCTP_STREAM_RESET_IN_FLIGHT;
11717                 }
11718         }
11719         if (SCTP_SIZE32(len) > len) {
11720                 /*-
11721                  * Need to worry about the pad we may end up adding to the
11722                  * end. This is easy since the struct is either aligned to 4
11723                  * bytes or 2 bytes off.
11724                  */
11725                 req_out->list_of_streams[number_entries] = 0;
11726         }
11727         /* now fix the chunk length */
11728         ch->chunk_length = htons(len + old_len);
11729         chk->book_size = len + old_len;
11730         chk->book_size_scale = 0;
11731         chk->send_size = SCTP_SIZE32(chk->book_size);
11732         SCTP_BUF_LEN(chk->data) = chk->send_size;
11733         return (1);
11734 }
11735
11736 static void
11737 sctp_add_stream_reset_in(struct sctp_tmit_chunk *chk,
11738     int number_entries, uint16_t *list,
11739     uint32_t seq)
11740 {
11741         uint16_t len, old_len, i;
11742         struct sctp_stream_reset_in_request *req_in;
11743         struct sctp_chunkhdr *ch;
11744
11745         ch = mtod(chk->data, struct sctp_chunkhdr *);
11746         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11747
11748         /* get to new offset for the param. */
11749         req_in = (struct sctp_stream_reset_in_request *)((caddr_t)ch + len);
11750         /* now how long will this param be? */
11751         len = (uint16_t)(sizeof(struct sctp_stream_reset_in_request) + (sizeof(uint16_t) * number_entries));
11752         req_in->ph.param_type = htons(SCTP_STR_RESET_IN_REQUEST);
11753         req_in->ph.param_length = htons(len);
11754         req_in->request_seq = htonl(seq);
11755         if (number_entries) {
11756                 for (i = 0; i < number_entries; i++) {
11757                         req_in->list_of_streams[i] = htons(list[i]);
11758                 }
11759         }
11760         if (SCTP_SIZE32(len) > len) {
11761                 /*-
11762                  * Need to worry about the pad we may end up adding to the
11763                  * end. This is easy since the struct is either aligned to 4
11764                  * bytes or 2 bytes off.
11765                  */
11766                 req_in->list_of_streams[number_entries] = 0;
11767         }
11768         /* now fix the chunk length */
11769         ch->chunk_length = htons(len + old_len);
11770         chk->book_size = len + old_len;
11771         chk->book_size_scale = 0;
11772         chk->send_size = SCTP_SIZE32(chk->book_size);
11773         SCTP_BUF_LEN(chk->data) = chk->send_size;
11774         return;
11775 }
11776
11777 static void
11778 sctp_add_stream_reset_tsn(struct sctp_tmit_chunk *chk,
11779     uint32_t seq)
11780 {
11781         uint16_t len, old_len;
11782         struct sctp_stream_reset_tsn_request *req_tsn;
11783         struct sctp_chunkhdr *ch;
11784
11785         ch = mtod(chk->data, struct sctp_chunkhdr *);
11786         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11787
11788         /* get to new offset for the param. */
11789         req_tsn = (struct sctp_stream_reset_tsn_request *)((caddr_t)ch + len);
11790         /* now how long will this param be? */
11791         len = sizeof(struct sctp_stream_reset_tsn_request);
11792         req_tsn->ph.param_type = htons(SCTP_STR_RESET_TSN_REQUEST);
11793         req_tsn->ph.param_length = htons(len);
11794         req_tsn->request_seq = htonl(seq);
11795
11796         /* now fix the chunk length */
11797         ch->chunk_length = htons(len + old_len);
11798         chk->send_size = len + old_len;
11799         chk->book_size = SCTP_SIZE32(chk->send_size);
11800         chk->book_size_scale = 0;
11801         SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size);
11802         return;
11803 }
11804
11805 void
11806 sctp_add_stream_reset_result(struct sctp_tmit_chunk *chk,
11807     uint32_t resp_seq, uint32_t result)
11808 {
11809         uint16_t len, old_len;
11810         struct sctp_stream_reset_response *resp;
11811         struct sctp_chunkhdr *ch;
11812
11813         ch = mtod(chk->data, struct sctp_chunkhdr *);
11814         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11815
11816         /* get to new offset for the param. */
11817         resp = (struct sctp_stream_reset_response *)((caddr_t)ch + len);
11818         /* now how long will this param be? */
11819         len = sizeof(struct sctp_stream_reset_response);
11820         resp->ph.param_type = htons(SCTP_STR_RESET_RESPONSE);
11821         resp->ph.param_length = htons(len);
11822         resp->response_seq = htonl(resp_seq);
11823         resp->result = ntohl(result);
11824
11825         /* now fix the chunk length */
11826         ch->chunk_length = htons(len + old_len);
11827         chk->book_size = len + old_len;
11828         chk->book_size_scale = 0;
11829         chk->send_size = SCTP_SIZE32(chk->book_size);
11830         SCTP_BUF_LEN(chk->data) = chk->send_size;
11831         return;
11832 }
11833
11834 void
11835 sctp_send_deferred_reset_response(struct sctp_tcb *stcb,
11836     struct sctp_stream_reset_list *ent,
11837     int response)
11838 {
11839         struct sctp_association *asoc;
11840         struct sctp_tmit_chunk *chk;
11841         struct sctp_chunkhdr *ch;
11842
11843         asoc = &stcb->asoc;
11844
11845         /*
11846          * Reset our last reset action to the new one IP -> response
11847          * (PERFORMED probably). This assures that if we fail to send, a
11848          * retran from the peer will get the new response.
11849          */
11850         asoc->last_reset_action[0] = response;
11851         if (asoc->stream_reset_outstanding) {
11852                 return;
11853         }
11854         sctp_alloc_a_chunk(stcb, chk);
11855         if (chk == NULL) {
11856                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
11857                 return;
11858         }
11859         chk->copy_by_ref = 0;
11860         chk->rec.chunk_id.id = SCTP_STREAM_RESET;
11861         chk->rec.chunk_id.can_take_data = 0;
11862         chk->flags = 0;
11863         chk->asoc = &stcb->asoc;
11864         chk->book_size = sizeof(struct sctp_chunkhdr);
11865         chk->send_size = SCTP_SIZE32(chk->book_size);
11866         chk->book_size_scale = 0;
11867         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
11868         if (chk->data == NULL) {
11869                 sctp_free_a_chunk(stcb, chk, SCTP_SO_LOCKED);
11870                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
11871                 return;
11872         }
11873         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11874         /* setup chunk parameters */
11875         chk->sent = SCTP_DATAGRAM_UNSENT;
11876         chk->snd_count = 0;
11877         if (stcb->asoc.alternate) {
11878                 chk->whoTo = stcb->asoc.alternate;
11879         } else {
11880                 chk->whoTo = stcb->asoc.primary_destination;
11881         }
11882         ch = mtod(chk->data, struct sctp_chunkhdr *);
11883         ch->chunk_type = SCTP_STREAM_RESET;
11884         ch->chunk_flags = 0;
11885         ch->chunk_length = htons(chk->book_size);
11886         atomic_add_int(&chk->whoTo->ref_count, 1);
11887         SCTP_BUF_LEN(chk->data) = chk->send_size;
11888         sctp_add_stream_reset_result(chk, ent->seq, response);
11889         /* insert the chunk for sending */
11890         TAILQ_INSERT_TAIL(&asoc->control_send_queue,
11891             chk,
11892             sctp_next);
11893         asoc->ctrl_queue_cnt++;
11894 }
11895
11896 void
11897 sctp_add_stream_reset_result_tsn(struct sctp_tmit_chunk *chk,
11898     uint32_t resp_seq, uint32_t result,
11899     uint32_t send_una, uint32_t recv_next)
11900 {
11901         uint16_t len, old_len;
11902         struct sctp_stream_reset_response_tsn *resp;
11903         struct sctp_chunkhdr *ch;
11904
11905         ch = mtod(chk->data, struct sctp_chunkhdr *);
11906         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11907
11908         /* get to new offset for the param. */
11909         resp = (struct sctp_stream_reset_response_tsn *)((caddr_t)ch + len);
11910         /* now how long will this param be? */
11911         len = sizeof(struct sctp_stream_reset_response_tsn);
11912         resp->ph.param_type = htons(SCTP_STR_RESET_RESPONSE);
11913         resp->ph.param_length = htons(len);
11914         resp->response_seq = htonl(resp_seq);
11915         resp->result = htonl(result);
11916         resp->senders_next_tsn = htonl(send_una);
11917         resp->receivers_next_tsn = htonl(recv_next);
11918
11919         /* now fix the chunk length */
11920         ch->chunk_length = htons(len + old_len);
11921         chk->book_size = len + old_len;
11922         chk->send_size = SCTP_SIZE32(chk->book_size);
11923         chk->book_size_scale = 0;
11924         SCTP_BUF_LEN(chk->data) = chk->send_size;
11925         return;
11926 }
11927
11928 static void
11929 sctp_add_an_out_stream(struct sctp_tmit_chunk *chk,
11930     uint32_t seq,
11931     uint16_t adding)
11932 {
11933         uint16_t len, old_len;
11934         struct sctp_chunkhdr *ch;
11935         struct sctp_stream_reset_add_strm *addstr;
11936
11937         ch = mtod(chk->data, struct sctp_chunkhdr *);
11938         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11939
11940         /* get to new offset for the param. */
11941         addstr = (struct sctp_stream_reset_add_strm *)((caddr_t)ch + len);
11942         /* now how long will this param be? */
11943         len = sizeof(struct sctp_stream_reset_add_strm);
11944
11945         /* Fill it out. */
11946         addstr->ph.param_type = htons(SCTP_STR_RESET_ADD_OUT_STREAMS);
11947         addstr->ph.param_length = htons(len);
11948         addstr->request_seq = htonl(seq);
11949         addstr->number_of_streams = htons(adding);
11950         addstr->reserved = 0;
11951
11952         /* now fix the chunk length */
11953         ch->chunk_length = htons(len + old_len);
11954         chk->send_size = len + old_len;
11955         chk->book_size = SCTP_SIZE32(chk->send_size);
11956         chk->book_size_scale = 0;
11957         SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size);
11958         return;
11959 }
11960
11961 static void
11962 sctp_add_an_in_stream(struct sctp_tmit_chunk *chk,
11963     uint32_t seq,
11964     uint16_t adding)
11965 {
11966         uint16_t len, old_len;
11967         struct sctp_chunkhdr *ch;
11968         struct sctp_stream_reset_add_strm *addstr;
11969
11970         ch = mtod(chk->data, struct sctp_chunkhdr *);
11971         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11972
11973         /* get to new offset for the param. */
11974         addstr = (struct sctp_stream_reset_add_strm *)((caddr_t)ch + len);
11975         /* now how long will this param be? */
11976         len = sizeof(struct sctp_stream_reset_add_strm);
11977         /* Fill it out. */
11978         addstr->ph.param_type = htons(SCTP_STR_RESET_ADD_IN_STREAMS);
11979         addstr->ph.param_length = htons(len);
11980         addstr->request_seq = htonl(seq);
11981         addstr->number_of_streams = htons(adding);
11982         addstr->reserved = 0;
11983
11984         /* now fix the chunk length */
11985         ch->chunk_length = htons(len + old_len);
11986         chk->send_size = len + old_len;
11987         chk->book_size = SCTP_SIZE32(chk->send_size);
11988         chk->book_size_scale = 0;
11989         SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size);
11990         return;
11991 }
11992
11993 int
11994 sctp_send_stream_reset_out_if_possible(struct sctp_tcb *stcb, int so_locked)
11995 {
11996         struct sctp_association *asoc;
11997         struct sctp_tmit_chunk *chk;
11998         struct sctp_chunkhdr *ch;
11999         uint32_t seq;
12000
12001         asoc = &stcb->asoc;
12002         asoc->trigger_reset = 0;
12003         if (asoc->stream_reset_outstanding) {
12004                 return (EALREADY);
12005         }
12006         sctp_alloc_a_chunk(stcb, chk);
12007         if (chk == NULL) {
12008                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12009                 return (ENOMEM);
12010         }
12011         chk->copy_by_ref = 0;
12012         chk->rec.chunk_id.id = SCTP_STREAM_RESET;
12013         chk->rec.chunk_id.can_take_data = 0;
12014         chk->flags = 0;
12015         chk->asoc = &stcb->asoc;
12016         chk->book_size = sizeof(struct sctp_chunkhdr);
12017         chk->send_size = SCTP_SIZE32(chk->book_size);
12018         chk->book_size_scale = 0;
12019         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
12020         if (chk->data == NULL) {
12021                 sctp_free_a_chunk(stcb, chk, so_locked);
12022                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12023                 return (ENOMEM);
12024         }
12025         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
12026
12027         /* setup chunk parameters */
12028         chk->sent = SCTP_DATAGRAM_UNSENT;
12029         chk->snd_count = 0;
12030         if (stcb->asoc.alternate) {
12031                 chk->whoTo = stcb->asoc.alternate;
12032         } else {
12033                 chk->whoTo = stcb->asoc.primary_destination;
12034         }
12035         ch = mtod(chk->data, struct sctp_chunkhdr *);
12036         ch->chunk_type = SCTP_STREAM_RESET;
12037         ch->chunk_flags = 0;
12038         ch->chunk_length = htons(chk->book_size);
12039         atomic_add_int(&chk->whoTo->ref_count, 1);
12040         SCTP_BUF_LEN(chk->data) = chk->send_size;
12041         seq = stcb->asoc.str_reset_seq_out;
12042         if (sctp_add_stream_reset_out(stcb, chk, seq, (stcb->asoc.str_reset_seq_in - 1), (stcb->asoc.sending_seq - 1))) {
12043                 seq++;
12044                 asoc->stream_reset_outstanding++;
12045         } else {
12046                 m_freem(chk->data);
12047                 chk->data = NULL;
12048                 sctp_free_a_chunk(stcb, chk, so_locked);
12049                 return (ENOENT);
12050         }
12051         asoc->str_reset = chk;
12052         /* insert the chunk for sending */
12053         TAILQ_INSERT_TAIL(&asoc->control_send_queue,
12054             chk,
12055             sctp_next);
12056         asoc->ctrl_queue_cnt++;
12057
12058         if (stcb->asoc.send_sack) {
12059                 sctp_send_sack(stcb, so_locked);
12060         }
12061         sctp_timer_start(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb, chk->whoTo);
12062         return (0);
12063 }
12064
12065 int
12066 sctp_send_str_reset_req(struct sctp_tcb *stcb,
12067     uint16_t number_entries, uint16_t *list,
12068     uint8_t send_in_req,
12069     uint8_t send_tsn_req,
12070     uint8_t add_stream,
12071     uint16_t adding_o,
12072     uint16_t adding_i, uint8_t peer_asked)
12073 {
12074         struct sctp_association *asoc;
12075         struct sctp_tmit_chunk *chk;
12076         struct sctp_chunkhdr *ch;
12077         int can_send_out_req = 0;
12078         uint32_t seq;
12079
12080         asoc = &stcb->asoc;
12081         if (asoc->stream_reset_outstanding) {
12082                 /*-
12083                  * Already one pending, must get ACK back to clear the flag.
12084                  */
12085                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EBUSY);
12086                 return (EBUSY);
12087         }
12088         if ((send_in_req == 0) && (send_tsn_req == 0) &&
12089             (add_stream == 0)) {
12090                 /* nothing to do */
12091                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12092                 return (EINVAL);
12093         }
12094         if (send_tsn_req && send_in_req) {
12095                 /* error, can't do that */
12096                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12097                 return (EINVAL);
12098         } else if (send_in_req) {
12099                 can_send_out_req = 1;
12100         }
12101         if (number_entries > (MCLBYTES -
12102             SCTP_MIN_OVERHEAD -
12103             sizeof(struct sctp_chunkhdr) -
12104             sizeof(struct sctp_stream_reset_out_request)) /
12105             sizeof(uint16_t)) {
12106                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12107                 return (ENOMEM);
12108         }
12109         sctp_alloc_a_chunk(stcb, chk);
12110         if (chk == NULL) {
12111                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12112                 return (ENOMEM);
12113         }
12114         chk->copy_by_ref = 0;
12115         chk->rec.chunk_id.id = SCTP_STREAM_RESET;
12116         chk->rec.chunk_id.can_take_data = 0;
12117         chk->flags = 0;
12118         chk->asoc = &stcb->asoc;
12119         chk->book_size = sizeof(struct sctp_chunkhdr);
12120         chk->send_size = SCTP_SIZE32(chk->book_size);
12121         chk->book_size_scale = 0;
12122
12123         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
12124         if (chk->data == NULL) {
12125                 sctp_free_a_chunk(stcb, chk, SCTP_SO_LOCKED);
12126                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12127                 return (ENOMEM);
12128         }
12129         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
12130
12131         /* setup chunk parameters */
12132         chk->sent = SCTP_DATAGRAM_UNSENT;
12133         chk->snd_count = 0;
12134         if (stcb->asoc.alternate) {
12135                 chk->whoTo = stcb->asoc.alternate;
12136         } else {
12137                 chk->whoTo = stcb->asoc.primary_destination;
12138         }
12139         atomic_add_int(&chk->whoTo->ref_count, 1);
12140         ch = mtod(chk->data, struct sctp_chunkhdr *);
12141         ch->chunk_type = SCTP_STREAM_RESET;
12142         ch->chunk_flags = 0;
12143         ch->chunk_length = htons(chk->book_size);
12144         SCTP_BUF_LEN(chk->data) = chk->send_size;
12145
12146         seq = stcb->asoc.str_reset_seq_out;
12147         if (can_send_out_req) {
12148                 int ret;
12149
12150                 ret = sctp_add_stream_reset_out(stcb, chk, seq, (stcb->asoc.str_reset_seq_in - 1), (stcb->asoc.sending_seq - 1));
12151                 if (ret) {
12152                         seq++;
12153                         asoc->stream_reset_outstanding++;
12154                 }
12155         }
12156         if ((add_stream & 1) &&
12157             ((stcb->asoc.strm_realoutsize - stcb->asoc.streamoutcnt) < adding_o)) {
12158                 /* Need to allocate more */
12159                 struct sctp_stream_out *oldstream;
12160                 struct sctp_stream_queue_pending *sp, *nsp;
12161                 int i;
12162 #if defined(SCTP_DETAILED_STR_STATS)
12163                 int j;
12164 #endif
12165
12166                 oldstream = stcb->asoc.strmout;
12167                 /* get some more */
12168                 SCTP_MALLOC(stcb->asoc.strmout, struct sctp_stream_out *,
12169                     (stcb->asoc.streamoutcnt + adding_o) * sizeof(struct sctp_stream_out),
12170                     SCTP_M_STRMO);
12171                 if (stcb->asoc.strmout == NULL) {
12172                         uint8_t x;
12173
12174                         stcb->asoc.strmout = oldstream;
12175                         /* Turn off the bit */
12176                         x = add_stream & 0xfe;
12177                         add_stream = x;
12178                         goto skip_stuff;
12179                 }
12180                 /*
12181                  * Ok now we proceed with copying the old out stuff and
12182                  * initializing the new stuff.
12183                  */
12184                 SCTP_TCB_SEND_LOCK(stcb);
12185                 stcb->asoc.ss_functions.sctp_ss_clear(stcb, &stcb->asoc, 0, 1);
12186                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
12187                         TAILQ_INIT(&stcb->asoc.strmout[i].outqueue);
12188                         stcb->asoc.strmout[i].chunks_on_queues = oldstream[i].chunks_on_queues;
12189                         stcb->asoc.strmout[i].next_mid_ordered = oldstream[i].next_mid_ordered;
12190                         stcb->asoc.strmout[i].next_mid_unordered = oldstream[i].next_mid_unordered;
12191                         stcb->asoc.strmout[i].last_msg_incomplete = oldstream[i].last_msg_incomplete;
12192                         stcb->asoc.strmout[i].sid = i;
12193                         stcb->asoc.strmout[i].state = oldstream[i].state;
12194                         /* FIX ME FIX ME */
12195                         /*
12196                          * This should be a SS_COPY operation FIX ME STREAM
12197                          * SCHEDULER EXPERT
12198                          */
12199                         stcb->asoc.ss_functions.sctp_ss_init_stream(stcb, &stcb->asoc.strmout[i], &oldstream[i]);
12200                         /* now anything on those queues? */
12201                         TAILQ_FOREACH_SAFE(sp, &oldstream[i].outqueue, next, nsp) {
12202                                 TAILQ_REMOVE(&oldstream[i].outqueue, sp, next);
12203                                 TAILQ_INSERT_TAIL(&stcb->asoc.strmout[i].outqueue, sp, next);
12204                         }
12205
12206                 }
12207                 /* now the new streams */
12208                 stcb->asoc.ss_functions.sctp_ss_init(stcb, &stcb->asoc, 1);
12209                 for (i = stcb->asoc.streamoutcnt; i < (stcb->asoc.streamoutcnt + adding_o); i++) {
12210                         TAILQ_INIT(&stcb->asoc.strmout[i].outqueue);
12211                         stcb->asoc.strmout[i].chunks_on_queues = 0;
12212 #if defined(SCTP_DETAILED_STR_STATS)
12213                         for (j = 0; j < SCTP_PR_SCTP_MAX + 1; j++) {
12214                                 stcb->asoc.strmout[i].abandoned_sent[j] = 0;
12215                                 stcb->asoc.strmout[i].abandoned_unsent[j] = 0;
12216                         }
12217 #else
12218                         stcb->asoc.strmout[i].abandoned_sent[0] = 0;
12219                         stcb->asoc.strmout[i].abandoned_unsent[0] = 0;
12220 #endif
12221                         stcb->asoc.strmout[i].next_mid_ordered = 0;
12222                         stcb->asoc.strmout[i].next_mid_unordered = 0;
12223                         stcb->asoc.strmout[i].sid = i;
12224                         stcb->asoc.strmout[i].last_msg_incomplete = 0;
12225                         stcb->asoc.ss_functions.sctp_ss_init_stream(stcb, &stcb->asoc.strmout[i], NULL);
12226                         stcb->asoc.strmout[i].state = SCTP_STREAM_CLOSED;
12227                 }
12228                 stcb->asoc.strm_realoutsize = stcb->asoc.streamoutcnt + adding_o;
12229                 SCTP_FREE(oldstream, SCTP_M_STRMO);
12230                 SCTP_TCB_SEND_UNLOCK(stcb);
12231         }
12232 skip_stuff:
12233         if ((add_stream & 1) && (adding_o > 0)) {
12234                 asoc->strm_pending_add_size = adding_o;
12235                 asoc->peer_req_out = peer_asked;
12236                 sctp_add_an_out_stream(chk, seq, adding_o);
12237                 seq++;
12238                 asoc->stream_reset_outstanding++;
12239         }
12240         if ((add_stream & 2) && (adding_i > 0)) {
12241                 sctp_add_an_in_stream(chk, seq, adding_i);
12242                 seq++;
12243                 asoc->stream_reset_outstanding++;
12244         }
12245         if (send_in_req) {
12246                 sctp_add_stream_reset_in(chk, number_entries, list, seq);
12247                 seq++;
12248                 asoc->stream_reset_outstanding++;
12249         }
12250         if (send_tsn_req) {
12251                 sctp_add_stream_reset_tsn(chk, seq);
12252                 asoc->stream_reset_outstanding++;
12253         }
12254         asoc->str_reset = chk;
12255         /* insert the chunk for sending */
12256         TAILQ_INSERT_TAIL(&asoc->control_send_queue,
12257             chk,
12258             sctp_next);
12259         asoc->ctrl_queue_cnt++;
12260         if (stcb->asoc.send_sack) {
12261                 sctp_send_sack(stcb, SCTP_SO_LOCKED);
12262         }
12263         sctp_timer_start(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb, chk->whoTo);
12264         return (0);
12265 }
12266
12267 void
12268 sctp_send_abort(struct mbuf *m, int iphlen, 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         /* Don't respond to an ABORT with an ABORT. */
12274         if (sctp_is_there_an_abort_here(m, iphlen, &vtag)) {
12275                 if (cause)
12276                         sctp_m_freem(cause);
12277                 return;
12278         }
12279         sctp_send_resp_msg(src, dst, sh, vtag, SCTP_ABORT_ASSOCIATION, cause,
12280             mflowtype, mflowid, fibnum,
12281             vrf_id, port);
12282         return;
12283 }
12284
12285 void
12286 sctp_send_operr_to(struct sockaddr *src, struct sockaddr *dst,
12287     struct sctphdr *sh, uint32_t vtag, struct mbuf *cause,
12288     uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum,
12289     uint32_t vrf_id, uint16_t port)
12290 {
12291         sctp_send_resp_msg(src, dst, sh, vtag, SCTP_OPERATION_ERROR, cause,
12292             mflowtype, mflowid, fibnum,
12293             vrf_id, port);
12294         return;
12295 }
12296
12297 static struct mbuf *
12298 sctp_copy_resume(struct uio *uio,
12299     int max_send_len,
12300     int user_marks_eor,
12301     int *error,
12302     uint32_t *sndout,
12303     struct mbuf **new_tail)
12304 {
12305         struct mbuf *m;
12306
12307         m = m_uiotombuf(uio, M_WAITOK, max_send_len, 0,
12308             (M_PKTHDR | (user_marks_eor ? M_EOR : 0)));
12309         if (m == NULL) {
12310                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOBUFS);
12311                 *error = ENOBUFS;
12312         } else {
12313                 *sndout = m_length(m, NULL);
12314                 *new_tail = m_last(m);
12315         }
12316         return (m);
12317 }
12318
12319 static int
12320 sctp_copy_one(struct sctp_stream_queue_pending *sp,
12321     struct uio *uio,
12322     int resv_upfront)
12323 {
12324         sp->data = m_uiotombuf(uio, M_WAITOK, sp->length,
12325             resv_upfront, 0);
12326         if (sp->data == NULL) {
12327                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOBUFS);
12328                 return (ENOBUFS);
12329         }
12330         sp->tail_mbuf = m_last(sp->data);
12331         return (0);
12332 }
12333
12334
12335
12336 static struct sctp_stream_queue_pending *
12337 sctp_copy_it_in(struct sctp_tcb *stcb,
12338     struct sctp_association *asoc,
12339     struct sctp_sndrcvinfo *srcv,
12340     struct uio *uio,
12341     struct sctp_nets *net,
12342     int max_send_len,
12343     int user_marks_eor,
12344     int *error)
12345 {
12346         /*-
12347          * This routine must be very careful in its work. Protocol
12348          * processing is up and running so care must be taken to spl...()
12349          * when you need to do something that may effect the stcb/asoc. The
12350          * sb is locked however. When data is copied the protocol processing
12351          * should be enabled since this is a slower operation...
12352          */
12353         struct sctp_stream_queue_pending *sp = NULL;
12354         int resv_in_first;
12355
12356         *error = 0;
12357         /* Now can we send this? */
12358         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_SENT) ||
12359             (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) ||
12360             (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED) ||
12361             (asoc->state & SCTP_STATE_SHUTDOWN_PENDING)) {
12362                 /* got data while shutting down */
12363                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
12364                 *error = ECONNRESET;
12365                 goto out_now;
12366         }
12367         sctp_alloc_a_strmoq(stcb, sp);
12368         if (sp == NULL) {
12369                 SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12370                 *error = ENOMEM;
12371                 goto out_now;
12372         }
12373         sp->act_flags = 0;
12374         sp->sender_all_done = 0;
12375         sp->sinfo_flags = srcv->sinfo_flags;
12376         sp->timetolive = srcv->sinfo_timetolive;
12377         sp->ppid = srcv->sinfo_ppid;
12378         sp->context = srcv->sinfo_context;
12379         sp->fsn = 0;
12380         (void)SCTP_GETTIME_TIMEVAL(&sp->ts);
12381
12382         sp->sid = srcv->sinfo_stream;
12383         sp->length = (uint32_t)min(uio->uio_resid, max_send_len);
12384         if ((sp->length == (uint32_t)uio->uio_resid) &&
12385             ((user_marks_eor == 0) ||
12386             (srcv->sinfo_flags & SCTP_EOF) ||
12387             (user_marks_eor && (srcv->sinfo_flags & SCTP_EOR)))) {
12388                 sp->msg_is_complete = 1;
12389         } else {
12390                 sp->msg_is_complete = 0;
12391         }
12392         sp->sender_all_done = 0;
12393         sp->some_taken = 0;
12394         sp->put_last_out = 0;
12395         resv_in_first = SCTP_DATA_CHUNK_OVERHEAD(stcb);
12396         sp->data = sp->tail_mbuf = NULL;
12397         if (sp->length == 0) {
12398                 goto skip_copy;
12399         }
12400         if (srcv->sinfo_keynumber_valid) {
12401                 sp->auth_keyid = srcv->sinfo_keynumber;
12402         } else {
12403                 sp->auth_keyid = stcb->asoc.authinfo.active_keyid;
12404         }
12405         if (sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks)) {
12406                 sctp_auth_key_acquire(stcb, sp->auth_keyid);
12407                 sp->holds_key_ref = 1;
12408         }
12409         *error = sctp_copy_one(sp, uio, resv_in_first);
12410 skip_copy:
12411         if (*error) {
12412                 sctp_free_a_strmoq(stcb, sp, SCTP_SO_LOCKED);
12413                 sp = NULL;
12414         } else {
12415                 if (sp->sinfo_flags & SCTP_ADDR_OVER) {
12416                         sp->net = net;
12417                         atomic_add_int(&sp->net->ref_count, 1);
12418                 } else {
12419                         sp->net = NULL;
12420                 }
12421                 sctp_set_prsctp_policy(sp);
12422         }
12423 out_now:
12424         return (sp);
12425 }
12426
12427
12428 int
12429 sctp_sosend(struct socket *so,
12430     struct sockaddr *addr,
12431     struct uio *uio,
12432     struct mbuf *top,
12433     struct mbuf *control,
12434     int flags,
12435     struct thread *p
12436 )
12437 {
12438         int error, use_sndinfo = 0;
12439         struct sctp_sndrcvinfo sndrcvninfo;
12440         struct sockaddr *addr_to_use;
12441 #if defined(INET) && defined(INET6)
12442         struct sockaddr_in sin;
12443 #endif
12444
12445         if (control) {
12446                 /* process cmsg snd/rcv info (maybe a assoc-id) */
12447                 if (sctp_find_cmsg(SCTP_SNDRCV, (void *)&sndrcvninfo, control,
12448                     sizeof(sndrcvninfo))) {
12449                         /* got one */
12450                         use_sndinfo = 1;
12451                 }
12452         }
12453         addr_to_use = addr;
12454 #if defined(INET) && defined(INET6)
12455         if ((addr) && (addr->sa_family == AF_INET6)) {
12456                 struct sockaddr_in6 *sin6;
12457
12458                 sin6 = (struct sockaddr_in6 *)addr;
12459                 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
12460                         in6_sin6_2_sin(&sin, sin6);
12461                         addr_to_use = (struct sockaddr *)&sin;
12462                 }
12463         }
12464 #endif
12465         error = sctp_lower_sosend(so, addr_to_use, uio, top,
12466             control,
12467             flags,
12468             use_sndinfo ? &sndrcvninfo : NULL
12469             ,p
12470             );
12471         return (error);
12472 }
12473
12474
12475 int
12476 sctp_lower_sosend(struct socket *so,
12477     struct sockaddr *addr,
12478     struct uio *uio,
12479     struct mbuf *i_pak,
12480     struct mbuf *control,
12481     int flags,
12482     struct sctp_sndrcvinfo *srcv
12483     ,
12484     struct thread *p
12485 )
12486 {
12487         unsigned int sndlen = 0, max_len;
12488         int error, len;
12489         struct mbuf *top = NULL;
12490         int queue_only = 0, queue_only_for_init = 0;
12491         int free_cnt_applied = 0;
12492         int un_sent;
12493         int now_filled = 0;
12494         unsigned int inqueue_bytes = 0;
12495         struct sctp_block_entry be;
12496         struct sctp_inpcb *inp;
12497         struct sctp_tcb *stcb = NULL;
12498         struct timeval now;
12499         struct sctp_nets *net;
12500         struct sctp_association *asoc;
12501         struct sctp_inpcb *t_inp;
12502         int user_marks_eor;
12503         int create_lock_applied = 0;
12504         int nagle_applies = 0;
12505         int some_on_control = 0;
12506         int got_all_of_the_send = 0;
12507         int hold_tcblock = 0;
12508         int non_blocking = 0;
12509         uint32_t local_add_more, local_soresv = 0;
12510         uint16_t port;
12511         uint16_t sinfo_flags;
12512         sctp_assoc_t sinfo_assoc_id;
12513
12514         error = 0;
12515         net = NULL;
12516         stcb = NULL;
12517         asoc = NULL;
12518
12519         t_inp = inp = (struct sctp_inpcb *)so->so_pcb;
12520         if (inp == NULL) {
12521                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12522                 error = EINVAL;
12523                 if (i_pak) {
12524                         SCTP_RELEASE_PKT(i_pak);
12525                 }
12526                 return (error);
12527         }
12528         if ((uio == NULL) && (i_pak == NULL)) {
12529                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12530                 return (EINVAL);
12531         }
12532         user_marks_eor = sctp_is_feature_on(inp, SCTP_PCB_FLAGS_EXPLICIT_EOR);
12533         atomic_add_int(&inp->total_sends, 1);
12534         if (uio) {
12535                 if (uio->uio_resid < 0) {
12536                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12537                         return (EINVAL);
12538                 }
12539                 sndlen = (unsigned int)uio->uio_resid;
12540         } else {
12541                 top = SCTP_HEADER_TO_CHAIN(i_pak);
12542                 sndlen = SCTP_HEADER_LEN(i_pak);
12543         }
12544         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Send called addr:%p send length %d\n",
12545             (void *)addr,
12546             sndlen);
12547         if ((inp->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) &&
12548             SCTP_IS_LISTENING(inp)) {
12549                 /* The listener can NOT send */
12550                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOTCONN);
12551                 error = ENOTCONN;
12552                 goto out_unlocked;
12553         }
12554         /**
12555          * Pre-screen address, if one is given the sin-len
12556          * must be set correctly!
12557          */
12558         if (addr) {
12559                 union sctp_sockstore *raddr = (union sctp_sockstore *)addr;
12560
12561                 switch (raddr->sa.sa_family) {
12562 #ifdef INET
12563                 case AF_INET:
12564                         if (raddr->sin.sin_len != sizeof(struct sockaddr_in)) {
12565                                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12566                                 error = EINVAL;
12567                                 goto out_unlocked;
12568                         }
12569                         port = raddr->sin.sin_port;
12570                         break;
12571 #endif
12572 #ifdef INET6
12573                 case AF_INET6:
12574                         if (raddr->sin6.sin6_len != sizeof(struct sockaddr_in6)) {
12575                                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12576                                 error = EINVAL;
12577                                 goto out_unlocked;
12578                         }
12579                         port = raddr->sin6.sin6_port;
12580                         break;
12581 #endif
12582                 default:
12583                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EAFNOSUPPORT);
12584                         error = EAFNOSUPPORT;
12585                         goto out_unlocked;
12586                 }
12587         } else
12588                 port = 0;
12589
12590         if (srcv) {
12591                 sinfo_flags = srcv->sinfo_flags;
12592                 sinfo_assoc_id = srcv->sinfo_assoc_id;
12593                 if (INVALID_SINFO_FLAG(sinfo_flags) ||
12594                     PR_SCTP_INVALID_POLICY(sinfo_flags)) {
12595                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12596                         error = EINVAL;
12597                         goto out_unlocked;
12598                 }
12599                 if (srcv->sinfo_flags)
12600                         SCTP_STAT_INCR(sctps_sends_with_flags);
12601         } else {
12602                 sinfo_flags = inp->def_send.sinfo_flags;
12603                 sinfo_assoc_id = inp->def_send.sinfo_assoc_id;
12604         }
12605         if (sinfo_flags & SCTP_SENDALL) {
12606                 /* its a sendall */
12607                 error = sctp_sendall(inp, uio, top, srcv);
12608                 top = NULL;
12609                 goto out_unlocked;
12610         }
12611         if ((sinfo_flags & SCTP_ADDR_OVER) && (addr == NULL)) {
12612                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12613                 error = EINVAL;
12614                 goto out_unlocked;
12615         }
12616         /* now we must find the assoc */
12617         if ((inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) ||
12618             (inp->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) {
12619                 SCTP_INP_RLOCK(inp);
12620                 stcb = LIST_FIRST(&inp->sctp_asoc_list);
12621                 if (stcb) {
12622                         SCTP_TCB_LOCK(stcb);
12623                         hold_tcblock = 1;
12624                 }
12625                 SCTP_INP_RUNLOCK(inp);
12626         } else if (sinfo_assoc_id) {
12627                 stcb = sctp_findassociation_ep_asocid(inp, sinfo_assoc_id, 1);
12628                 if (stcb != NULL) {
12629                         hold_tcblock = 1;
12630                 }
12631         } else if (addr) {
12632                 /*-
12633                  * Since we did not use findep we must
12634                  * increment it, and if we don't find a tcb
12635                  * decrement it.
12636                  */
12637                 SCTP_INP_WLOCK(inp);
12638                 SCTP_INP_INCR_REF(inp);
12639                 SCTP_INP_WUNLOCK(inp);
12640                 stcb = sctp_findassociation_ep_addr(&t_inp, addr, &net, NULL, NULL);
12641                 if (stcb == NULL) {
12642                         SCTP_INP_WLOCK(inp);
12643                         SCTP_INP_DECR_REF(inp);
12644                         SCTP_INP_WUNLOCK(inp);
12645                 } else {
12646                         hold_tcblock = 1;
12647                 }
12648         }
12649         if ((stcb == NULL) && (addr)) {
12650                 /* Possible implicit send? */
12651                 SCTP_ASOC_CREATE_LOCK(inp);
12652                 create_lock_applied = 1;
12653                 if ((inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) ||
12654                     (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE)) {
12655                         /* Should I really unlock ? */
12656                         SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12657                         error = EINVAL;
12658                         goto out_unlocked;
12659
12660                 }
12661                 if (((inp->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) == 0) &&
12662                     (addr->sa_family == AF_INET6)) {
12663                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12664                         error = EINVAL;
12665                         goto out_unlocked;
12666                 }
12667                 SCTP_INP_WLOCK(inp);
12668                 SCTP_INP_INCR_REF(inp);
12669                 SCTP_INP_WUNLOCK(inp);
12670                 /* With the lock applied look again */
12671                 stcb = sctp_findassociation_ep_addr(&t_inp, addr, &net, NULL, NULL);
12672                 if ((stcb == NULL) && (control != NULL) && (port > 0)) {
12673                         stcb = sctp_findassociation_cmsgs(&t_inp, port, control, &net, &error);
12674                 }
12675                 if (stcb == NULL) {
12676                         SCTP_INP_WLOCK(inp);
12677                         SCTP_INP_DECR_REF(inp);
12678                         SCTP_INP_WUNLOCK(inp);
12679                 } else {
12680                         hold_tcblock = 1;
12681                 }
12682                 if (error) {
12683                         goto out_unlocked;
12684                 }
12685                 if (t_inp != inp) {
12686                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOTCONN);
12687                         error = ENOTCONN;
12688                         goto out_unlocked;
12689                 }
12690         }
12691         if (stcb == NULL) {
12692                 if (addr == NULL) {
12693                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOENT);
12694                         error = ENOENT;
12695                         goto out_unlocked;
12696                 } else {
12697                         /* We must go ahead and start the INIT process */
12698                         uint32_t vrf_id;
12699
12700                         if ((sinfo_flags & SCTP_ABORT) ||
12701                             ((sinfo_flags & SCTP_EOF) && (sndlen == 0))) {
12702                                 /*-
12703                                  * User asks to abort a non-existant assoc,
12704                                  * or EOF a non-existant assoc with no data
12705                                  */
12706                                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOENT);
12707                                 error = ENOENT;
12708                                 goto out_unlocked;
12709                         }
12710                         /* get an asoc/stcb struct */
12711                         vrf_id = inp->def_vrf_id;
12712 #ifdef INVARIANTS
12713                         if (create_lock_applied == 0) {
12714                                 panic("Error, should hold create lock and I don't?");
12715                         }
12716 #endif
12717                         stcb = sctp_aloc_assoc(inp, addr, &error, 0, vrf_id,
12718                             inp->sctp_ep.pre_open_stream_count,
12719                             inp->sctp_ep.port,
12720                             p);
12721                         if (stcb == NULL) {
12722                                 /* Error is setup for us in the call */
12723                                 goto out_unlocked;
12724                         }
12725                         if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) {
12726                                 stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED;
12727                                 /*
12728                                  * Set the connected flag so we can queue
12729                                  * data
12730                                  */
12731                                 soisconnecting(so);
12732                         }
12733                         hold_tcblock = 1;
12734                         if (create_lock_applied) {
12735                                 SCTP_ASOC_CREATE_UNLOCK(inp);
12736                                 create_lock_applied = 0;
12737                         } else {
12738                                 SCTP_PRINTF("Huh-3? create lock should have been on??\n");
12739                         }
12740                         /*
12741                          * Turn on queue only flag to prevent data from
12742                          * being sent
12743                          */
12744                         queue_only = 1;
12745                         asoc = &stcb->asoc;
12746                         SCTP_SET_STATE(asoc, SCTP_STATE_COOKIE_WAIT);
12747                         (void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered);
12748
12749                         /* initialize authentication params for the assoc */
12750                         sctp_initialize_auth_params(inp, stcb);
12751
12752                         if (control) {
12753                                 if (sctp_process_cmsgs_for_init(stcb, control, &error)) {
12754                                         sctp_free_assoc(inp, stcb, SCTP_PCBFREE_FORCE,
12755                                             SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_5);
12756                                         hold_tcblock = 0;
12757                                         stcb = NULL;
12758                                         goto out_unlocked;
12759                                 }
12760                         }
12761                         /* out with the INIT */
12762                         queue_only_for_init = 1;
12763                         /*-
12764                          * we may want to dig in after this call and adjust the MTU
12765                          * value. It defaulted to 1500 (constant) but the ro
12766                          * structure may now have an update and thus we may need to
12767                          * change it BEFORE we append the message.
12768                          */
12769                 }
12770         } else
12771                 asoc = &stcb->asoc;
12772         if (srcv == NULL)
12773                 srcv = (struct sctp_sndrcvinfo *)&asoc->def_send;
12774         if (srcv->sinfo_flags & SCTP_ADDR_OVER) {
12775                 if (addr)
12776                         net = sctp_findnet(stcb, addr);
12777                 else
12778                         net = NULL;
12779                 if ((net == NULL) ||
12780                     ((port != 0) && (port != stcb->rport))) {
12781                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12782                         error = EINVAL;
12783                         goto out_unlocked;
12784                 }
12785         } else {
12786                 if (stcb->asoc.alternate) {
12787                         net = stcb->asoc.alternate;
12788                 } else {
12789                         net = stcb->asoc.primary_destination;
12790                 }
12791         }
12792         atomic_add_int(&stcb->total_sends, 1);
12793         /* Keep the stcb from being freed under our feet */
12794         atomic_add_int(&asoc->refcnt, 1);
12795         free_cnt_applied = 1;
12796
12797         if (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_NO_FRAGMENT)) {
12798                 if (sndlen > asoc->smallest_mtu) {
12799                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EMSGSIZE);
12800                         error = EMSGSIZE;
12801                         goto out_unlocked;
12802                 }
12803         }
12804         if (SCTP_SO_IS_NBIO(so)
12805             || (flags & MSG_NBIO)
12806             ) {
12807                 non_blocking = 1;
12808         }
12809         /* would we block? */
12810         if (non_blocking) {
12811                 uint32_t amount;
12812
12813                 if (hold_tcblock == 0) {
12814                         SCTP_TCB_LOCK(stcb);
12815                         hold_tcblock = 1;
12816                 }
12817                 inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * SCTP_DATA_CHUNK_OVERHEAD(stcb));
12818                 if (user_marks_eor == 0) {
12819                         amount = sndlen;
12820                 } else {
12821                         amount = 1;
12822                 }
12823                 if ((SCTP_SB_LIMIT_SND(so) < (amount + inqueue_bytes + stcb->asoc.sb_send_resv)) ||
12824                     (stcb->asoc.chunks_on_out_queue >= SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue))) {
12825                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EWOULDBLOCK);
12826                         if (sndlen > SCTP_SB_LIMIT_SND(so))
12827                                 error = EMSGSIZE;
12828                         else
12829                                 error = EWOULDBLOCK;
12830                         goto out_unlocked;
12831                 }
12832                 stcb->asoc.sb_send_resv += sndlen;
12833                 SCTP_TCB_UNLOCK(stcb);
12834                 hold_tcblock = 0;
12835         } else {
12836                 atomic_add_int(&stcb->asoc.sb_send_resv, sndlen);
12837         }
12838         local_soresv = sndlen;
12839         if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
12840                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
12841                 error = ECONNRESET;
12842                 goto out_unlocked;
12843         }
12844         if (create_lock_applied) {
12845                 SCTP_ASOC_CREATE_UNLOCK(inp);
12846                 create_lock_applied = 0;
12847         }
12848         /* Is the stream no. valid? */
12849         if (srcv->sinfo_stream >= asoc->streamoutcnt) {
12850                 /* Invalid stream number */
12851                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12852                 error = EINVAL;
12853                 goto out_unlocked;
12854         }
12855         if ((asoc->strmout[srcv->sinfo_stream].state != SCTP_STREAM_OPEN) &&
12856             (asoc->strmout[srcv->sinfo_stream].state != SCTP_STREAM_OPENING)) {
12857                 /*
12858                  * Can't queue any data while stream reset is underway.
12859                  */
12860                 if (asoc->strmout[srcv->sinfo_stream].state > SCTP_STREAM_OPEN) {
12861                         error = EAGAIN;
12862                 } else {
12863                         error = EINVAL;
12864                 }
12865                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, error);
12866                 goto out_unlocked;
12867         }
12868         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) ||
12869             (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)) {
12870                 queue_only = 1;
12871         }
12872         /* we are now done with all control */
12873         if (control) {
12874                 sctp_m_freem(control);
12875                 control = NULL;
12876         }
12877         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_SENT) ||
12878             (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED) ||
12879             (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) ||
12880             (asoc->state & SCTP_STATE_SHUTDOWN_PENDING)) {
12881                 if (srcv->sinfo_flags & SCTP_ABORT) {
12882                         ;
12883                 } else {
12884                         SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
12885                         error = ECONNRESET;
12886                         goto out_unlocked;
12887                 }
12888         }
12889         /* Ok, we will attempt a msgsnd :> */
12890         if (p) {
12891                 p->td_ru.ru_msgsnd++;
12892         }
12893         /* Are we aborting? */
12894         if (srcv->sinfo_flags & SCTP_ABORT) {
12895                 struct mbuf *mm;
12896                 int tot_demand, tot_out = 0, max_out;
12897
12898                 SCTP_STAT_INCR(sctps_sends_with_abort);
12899                 if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) ||
12900                     (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)) {
12901                         /* It has to be up before we abort */
12902                         /* how big is the user initiated abort? */
12903                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12904                         error = EINVAL;
12905                         goto out;
12906                 }
12907                 if (hold_tcblock) {
12908                         SCTP_TCB_UNLOCK(stcb);
12909                         hold_tcblock = 0;
12910                 }
12911                 if (top) {
12912                         struct mbuf *cntm = NULL;
12913
12914                         mm = sctp_get_mbuf_for_msg(sizeof(struct sctp_paramhdr), 0, M_WAITOK, 1, MT_DATA);
12915                         if (sndlen != 0) {
12916                                 for (cntm = top; cntm; cntm = SCTP_BUF_NEXT(cntm)) {
12917                                         tot_out += SCTP_BUF_LEN(cntm);
12918                                 }
12919                         }
12920                 } else {
12921                         /* Must fit in a MTU */
12922                         tot_out = sndlen;
12923                         tot_demand = (tot_out + sizeof(struct sctp_paramhdr));
12924                         if (tot_demand > SCTP_DEFAULT_ADD_MORE) {
12925                                 /* To big */
12926                                 SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EMSGSIZE);
12927                                 error = EMSGSIZE;
12928                                 goto out;
12929                         }
12930                         mm = sctp_get_mbuf_for_msg(tot_demand, 0, M_WAITOK, 1, MT_DATA);
12931                 }
12932                 if (mm == NULL) {
12933                         SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12934                         error = ENOMEM;
12935                         goto out;
12936                 }
12937                 max_out = asoc->smallest_mtu - sizeof(struct sctp_paramhdr);
12938                 max_out -= sizeof(struct sctp_abort_msg);
12939                 if (tot_out > max_out) {
12940                         tot_out = max_out;
12941                 }
12942                 if (mm) {
12943                         struct sctp_paramhdr *ph;
12944
12945                         /* now move forward the data pointer */
12946                         ph = mtod(mm, struct sctp_paramhdr *);
12947                         ph->param_type = htons(SCTP_CAUSE_USER_INITIATED_ABT);
12948                         ph->param_length = htons((uint16_t)(sizeof(struct sctp_paramhdr) + tot_out));
12949                         ph++;
12950                         SCTP_BUF_LEN(mm) = tot_out + sizeof(struct sctp_paramhdr);
12951                         if (top == NULL) {
12952                                 error = uiomove((caddr_t)ph, (int)tot_out, uio);
12953                                 if (error) {
12954                                         /*-
12955                                          * Here if we can't get his data we
12956                                          * still abort we just don't get to
12957                                          * send the users note :-0
12958                                          */
12959                                         sctp_m_freem(mm);
12960                                         mm = NULL;
12961                                 }
12962                         } else {
12963                                 if (sndlen != 0) {
12964                                         SCTP_BUF_NEXT(mm) = top;
12965                                 }
12966                         }
12967                 }
12968                 if (hold_tcblock == 0) {
12969                         SCTP_TCB_LOCK(stcb);
12970                 }
12971                 atomic_add_int(&stcb->asoc.refcnt, -1);
12972                 free_cnt_applied = 0;
12973                 /* release this lock, otherwise we hang on ourselves */
12974                 sctp_abort_an_association(stcb->sctp_ep, stcb, mm, SCTP_SO_LOCKED);
12975                 /* now relock the stcb so everything is sane */
12976                 hold_tcblock = 0;
12977                 stcb = NULL;
12978                 /*
12979                  * In this case top is already chained to mm avoid double
12980                  * free, since we free it below if top != NULL and driver
12981                  * would free it after sending the packet out
12982                  */
12983                 if (sndlen != 0) {
12984                         top = NULL;
12985                 }
12986                 goto out_unlocked;
12987         }
12988         /* Calculate the maximum we can send */
12989         inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * SCTP_DATA_CHUNK_OVERHEAD(stcb));
12990         if (SCTP_SB_LIMIT_SND(so) > inqueue_bytes) {
12991                 if (non_blocking) {
12992                         /* we already checked for non-blocking above. */
12993                         max_len = sndlen;
12994                 } else {
12995                         max_len = SCTP_SB_LIMIT_SND(so) - inqueue_bytes;
12996                 }
12997         } else {
12998                 max_len = 0;
12999         }
13000         if (hold_tcblock) {
13001                 SCTP_TCB_UNLOCK(stcb);
13002                 hold_tcblock = 0;
13003         }
13004         if (asoc->strmout == NULL) {
13005                 /* huh? software error */
13006                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EFAULT);
13007                 error = EFAULT;
13008                 goto out_unlocked;
13009         }
13010         /* Unless E_EOR mode is on, we must make a send FIT in one call. */
13011         if ((user_marks_eor == 0) &&
13012             (sndlen > SCTP_SB_LIMIT_SND(stcb->sctp_socket))) {
13013                 /* It will NEVER fit */
13014                 SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EMSGSIZE);
13015                 error = EMSGSIZE;
13016                 goto out_unlocked;
13017         }
13018         if ((uio == NULL) && user_marks_eor) {
13019                 /*-
13020                  * We do not support eeor mode for
13021                  * sending with mbuf chains (like sendfile).
13022                  */
13023                 SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
13024                 error = EINVAL;
13025                 goto out_unlocked;
13026         }
13027         if (user_marks_eor) {
13028                 local_add_more = min(SCTP_SB_LIMIT_SND(so), SCTP_BASE_SYSCTL(sctp_add_more_threshold));
13029         } else {
13030                 /*-
13031                  * For non-eeor the whole message must fit in
13032                  * the socket send buffer.
13033                  */
13034                 local_add_more = sndlen;
13035         }
13036         len = 0;
13037         if (non_blocking) {
13038                 goto skip_preblock;
13039         }
13040         if (((max_len <= local_add_more) &&
13041             (SCTP_SB_LIMIT_SND(so) >= local_add_more)) ||
13042             (max_len == 0) ||
13043             ((stcb->asoc.chunks_on_out_queue + stcb->asoc.stream_queue_cnt) >= SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue))) {
13044                 /* No room right now ! */
13045                 SOCKBUF_LOCK(&so->so_snd);
13046                 inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * SCTP_DATA_CHUNK_OVERHEAD(stcb));
13047                 while ((SCTP_SB_LIMIT_SND(so) < (inqueue_bytes + local_add_more)) ||
13048                     ((stcb->asoc.stream_queue_cnt + stcb->asoc.chunks_on_out_queue) >= SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue))) {
13049                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "pre_block limit:%u <(inq:%d + %d) || (%d+%d > %d)\n",
13050                             (unsigned int)SCTP_SB_LIMIT_SND(so),
13051                             inqueue_bytes,
13052                             local_add_more,
13053                             stcb->asoc.stream_queue_cnt,
13054                             stcb->asoc.chunks_on_out_queue,
13055                             SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue));
13056                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13057                                 sctp_log_block(SCTP_BLOCK_LOG_INTO_BLKA, asoc, sndlen);
13058                         }
13059                         be.error = 0;
13060                         stcb->block_entry = &be;
13061                         error = sbwait(&so->so_snd);
13062                         stcb->block_entry = NULL;
13063                         if (error || so->so_error || be.error) {
13064                                 if (error == 0) {
13065                                         if (so->so_error)
13066                                                 error = so->so_error;
13067                                         if (be.error) {
13068                                                 error = be.error;
13069                                         }
13070                                 }
13071                                 SOCKBUF_UNLOCK(&so->so_snd);
13072                                 goto out_unlocked;
13073                         }
13074                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13075                                 sctp_log_block(SCTP_BLOCK_LOG_OUTOF_BLK,
13076                                     asoc, stcb->asoc.total_output_queue_size);
13077                         }
13078                         if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
13079                                 SOCKBUF_UNLOCK(&so->so_snd);
13080                                 goto out_unlocked;
13081                         }
13082                         inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * SCTP_DATA_CHUNK_OVERHEAD(stcb));
13083                 }
13084                 if (SCTP_SB_LIMIT_SND(so) > inqueue_bytes) {
13085                         max_len = SCTP_SB_LIMIT_SND(so) - inqueue_bytes;
13086                 } else {
13087                         max_len = 0;
13088                 }
13089                 SOCKBUF_UNLOCK(&so->so_snd);
13090         }
13091 skip_preblock:
13092         if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
13093                 goto out_unlocked;
13094         }
13095         /*
13096          * sndlen covers for mbuf case uio_resid covers for the non-mbuf
13097          * case NOTE: uio will be null when top/mbuf is passed
13098          */
13099         if (sndlen == 0) {
13100                 if (srcv->sinfo_flags & SCTP_EOF) {
13101                         got_all_of_the_send = 1;
13102                         goto dataless_eof;
13103                 } else {
13104                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
13105                         error = EINVAL;
13106                         goto out;
13107                 }
13108         }
13109         if (top == NULL) {
13110                 struct sctp_stream_queue_pending *sp;
13111                 struct sctp_stream_out *strm;
13112                 uint32_t sndout;
13113
13114                 SCTP_TCB_SEND_LOCK(stcb);
13115                 if ((asoc->stream_locked) &&
13116                     (asoc->stream_locked_on != srcv->sinfo_stream)) {
13117                         SCTP_TCB_SEND_UNLOCK(stcb);
13118                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
13119                         error = EINVAL;
13120                         goto out;
13121                 }
13122                 SCTP_TCB_SEND_UNLOCK(stcb);
13123
13124                 strm = &stcb->asoc.strmout[srcv->sinfo_stream];
13125                 if (strm->last_msg_incomplete == 0) {
13126         do_a_copy_in:
13127                         sp = sctp_copy_it_in(stcb, asoc, srcv, uio, net, max_len, user_marks_eor, &error);
13128                         if (error) {
13129                                 goto out;
13130                         }
13131                         SCTP_TCB_SEND_LOCK(stcb);
13132                         if (sp->msg_is_complete) {
13133                                 strm->last_msg_incomplete = 0;
13134                                 asoc->stream_locked = 0;
13135                         } else {
13136                                 /*
13137                                  * Just got locked to this guy in case of an
13138                                  * interrupt.
13139                                  */
13140                                 strm->last_msg_incomplete = 1;
13141                                 if (stcb->asoc.idata_supported == 0) {
13142                                         asoc->stream_locked = 1;
13143                                         asoc->stream_locked_on = srcv->sinfo_stream;
13144                                 }
13145                                 sp->sender_all_done = 0;
13146                         }
13147                         sctp_snd_sb_alloc(stcb, sp->length);
13148                         atomic_add_int(&asoc->stream_queue_cnt, 1);
13149                         if (srcv->sinfo_flags & SCTP_UNORDERED) {
13150                                 SCTP_STAT_INCR(sctps_sends_with_unord);
13151                         }
13152                         TAILQ_INSERT_TAIL(&strm->outqueue, sp, next);
13153                         stcb->asoc.ss_functions.sctp_ss_add_to_stream(stcb, asoc, strm, sp, 1);
13154                         SCTP_TCB_SEND_UNLOCK(stcb);
13155                 } else {
13156                         SCTP_TCB_SEND_LOCK(stcb);
13157                         sp = TAILQ_LAST(&strm->outqueue, sctp_streamhead);
13158                         SCTP_TCB_SEND_UNLOCK(stcb);
13159                         if (sp == NULL) {
13160                                 /* ???? Huh ??? last msg is gone */
13161 #ifdef INVARIANTS
13162                                 panic("Warning: Last msg marked incomplete, yet nothing left?");
13163 #else
13164                                 SCTP_PRINTF("Warning: Last msg marked incomplete, yet nothing left?\n");
13165                                 strm->last_msg_incomplete = 0;
13166 #endif
13167                                 goto do_a_copy_in;
13168
13169                         }
13170                 }
13171                 while (uio->uio_resid > 0) {
13172                         /* How much room do we have? */
13173                         struct mbuf *new_tail, *mm;
13174
13175                         inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * SCTP_DATA_CHUNK_OVERHEAD(stcb));
13176                         if (SCTP_SB_LIMIT_SND(so) > inqueue_bytes)
13177                                 max_len = SCTP_SB_LIMIT_SND(so) - inqueue_bytes;
13178                         else
13179                                 max_len = 0;
13180
13181                         if ((max_len > SCTP_BASE_SYSCTL(sctp_add_more_threshold)) ||
13182                             (max_len && (SCTP_SB_LIMIT_SND(so) < SCTP_BASE_SYSCTL(sctp_add_more_threshold))) ||
13183                             (uio->uio_resid && (uio->uio_resid <= (int)max_len))) {
13184                                 sndout = 0;
13185                                 new_tail = NULL;
13186                                 if (hold_tcblock) {
13187                                         SCTP_TCB_UNLOCK(stcb);
13188                                         hold_tcblock = 0;
13189                                 }
13190                                 mm = sctp_copy_resume(uio, max_len, user_marks_eor, &error, &sndout, &new_tail);
13191                                 if ((mm == NULL) || error) {
13192                                         if (mm) {
13193                                                 sctp_m_freem(mm);
13194                                         }
13195                                         goto out;
13196                                 }
13197                                 /* Update the mbuf and count */
13198                                 SCTP_TCB_SEND_LOCK(stcb);
13199                                 if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
13200                                         /*
13201                                          * we need to get out. Peer probably
13202                                          * aborted.
13203                                          */
13204                                         sctp_m_freem(mm);
13205                                         if (stcb->asoc.state & SCTP_PCB_FLAGS_WAS_ABORTED) {
13206                                                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
13207                                                 error = ECONNRESET;
13208                                         }
13209                                         SCTP_TCB_SEND_UNLOCK(stcb);
13210                                         goto out;
13211                                 }
13212                                 if (sp->tail_mbuf) {
13213                                         /* tack it to the end */
13214                                         SCTP_BUF_NEXT(sp->tail_mbuf) = mm;
13215                                         sp->tail_mbuf = new_tail;
13216                                 } else {
13217                                         /* A stolen mbuf */
13218                                         sp->data = mm;
13219                                         sp->tail_mbuf = new_tail;
13220                                 }
13221                                 sctp_snd_sb_alloc(stcb, sndout);
13222                                 atomic_add_int(&sp->length, sndout);
13223                                 len += sndout;
13224                                 if (srcv->sinfo_flags & SCTP_SACK_IMMEDIATELY) {
13225                                         sp->sinfo_flags |= SCTP_SACK_IMMEDIATELY;
13226                                 }
13227                                 /* Did we reach EOR? */
13228                                 if ((uio->uio_resid == 0) &&
13229                                     ((user_marks_eor == 0) ||
13230                                     (srcv->sinfo_flags & SCTP_EOF) ||
13231                                     (user_marks_eor && (srcv->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, 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->asoc) == SCTP_STATE_OPEN) {
13276                                         /* a collision took us forward? */
13277                                         queue_only = 0;
13278                                 } else {
13279                                         sctp_send_initiate(inp, stcb, SCTP_SO_LOCKED);
13280                                         SCTP_SET_STATE(asoc, SCTP_STATE_COOKIE_WAIT);
13281                                         queue_only = 1;
13282                                 }
13283                         }
13284                         if ((net->flight_size > net->cwnd) &&
13285                             (asoc->sctp_cmt_on_off == 0)) {
13286                                 SCTP_STAT_INCR(sctps_send_cwnd_avoid);
13287                                 queue_only = 1;
13288                         } else if (asoc->ifp_had_enobuf) {
13289                                 SCTP_STAT_INCR(sctps_ifnomemqueued);
13290                                 if (net->flight_size > (2 * net->mtu)) {
13291                                         queue_only = 1;
13292                                 }
13293                                 asoc->ifp_had_enobuf = 0;
13294                         }
13295                         un_sent = stcb->asoc.total_output_queue_size - stcb->asoc.total_flight;
13296                         if ((sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY)) &&
13297                             (stcb->asoc.total_flight > 0) &&
13298                             (stcb->asoc.stream_queue_cnt < SCTP_MAX_DATA_BUNDLING) &&
13299                             (un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD))) {
13300
13301                                 /*-
13302                                  * Ok, Nagle is set on and we have data outstanding.
13303                                  * Don't send anything and let SACKs drive out the
13304                                  * data unless we have a "full" segment to send.
13305                                  */
13306                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
13307                                         sctp_log_nagle_event(stcb, SCTP_NAGLE_APPLIED);
13308                                 }
13309                                 SCTP_STAT_INCR(sctps_naglequeued);
13310                                 nagle_applies = 1;
13311                         } else {
13312                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
13313                                         if (sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY))
13314                                                 sctp_log_nagle_event(stcb, SCTP_NAGLE_SKIPPED);
13315                                 }
13316                                 SCTP_STAT_INCR(sctps_naglesent);
13317                                 nagle_applies = 0;
13318                         }
13319                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13320
13321                                 sctp_misc_ints(SCTP_CWNDLOG_PRESEND, queue_only_for_init, queue_only,
13322                                     nagle_applies, un_sent);
13323                                 sctp_misc_ints(SCTP_CWNDLOG_PRESEND, stcb->asoc.total_output_queue_size,
13324                                     stcb->asoc.total_flight,
13325                                     stcb->asoc.chunks_on_out_queue, stcb->asoc.total_flight_count);
13326                         }
13327                         if (queue_only_for_init)
13328                                 queue_only_for_init = 0;
13329                         if ((queue_only == 0) && (nagle_applies == 0)) {
13330                                 /*-
13331                                  * need to start chunk output
13332                                  * before blocking.. note that if
13333                                  * a lock is already applied, then
13334                                  * the input via the net is happening
13335                                  * and I don't need to start output :-D
13336                                  */
13337                                 if (hold_tcblock == 0) {
13338                                         if (SCTP_TCB_TRYLOCK(stcb)) {
13339                                                 hold_tcblock = 1;
13340                                                 sctp_chunk_output(inp,
13341                                                     stcb,
13342                                                     SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13343                                         }
13344                                 } else {
13345                                         sctp_chunk_output(inp,
13346                                             stcb,
13347                                             SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13348                                 }
13349                                 if (hold_tcblock == 1) {
13350                                         SCTP_TCB_UNLOCK(stcb);
13351                                         hold_tcblock = 0;
13352                                 }
13353                         }
13354                         SOCKBUF_LOCK(&so->so_snd);
13355                         /*-
13356                          * This is a bit strange, but I think it will
13357                          * work. The total_output_queue_size is locked and
13358                          * protected by the TCB_LOCK, which we just released.
13359                          * There is a race that can occur between releasing it
13360                          * above, and me getting the socket lock, where sacks
13361                          * come in but we have not put the SB_WAIT on the
13362                          * so_snd buffer to get the wakeup. After the LOCK
13363                          * is applied the sack_processing will also need to
13364                          * LOCK the so->so_snd to do the actual sowwakeup(). So
13365                          * once we have the socket buffer lock if we recheck the
13366                          * size we KNOW we will get to sleep safely with the
13367                          * wakeup flag in place.
13368                          */
13369                         inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * SCTP_DATA_CHUNK_OVERHEAD(stcb));
13370                         if (SCTP_SB_LIMIT_SND(so) <= (inqueue_bytes +
13371                             min(SCTP_BASE_SYSCTL(sctp_add_more_threshold), SCTP_SB_LIMIT_SND(so)))) {
13372                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13373                                         sctp_log_block(SCTP_BLOCK_LOG_INTO_BLK,
13374                                             asoc, (size_t)uio->uio_resid);
13375                                 }
13376                                 be.error = 0;
13377                                 stcb->block_entry = &be;
13378                                 error = sbwait(&so->so_snd);
13379                                 stcb->block_entry = NULL;
13380
13381                                 if (error || so->so_error || be.error) {
13382                                         if (error == 0) {
13383                                                 if (so->so_error)
13384                                                         error = so->so_error;
13385                                                 if (be.error) {
13386                                                         error = be.error;
13387                                                 }
13388                                         }
13389                                         SOCKBUF_UNLOCK(&so->so_snd);
13390                                         goto out_unlocked;
13391                                 }
13392                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13393                                         sctp_log_block(SCTP_BLOCK_LOG_OUTOF_BLK,
13394                                             asoc, stcb->asoc.total_output_queue_size);
13395                                 }
13396                         }
13397                         SOCKBUF_UNLOCK(&so->so_snd);
13398                         if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
13399                                 goto out_unlocked;
13400                         }
13401                 }
13402                 SCTP_TCB_SEND_LOCK(stcb);
13403                 if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
13404                         SCTP_TCB_SEND_UNLOCK(stcb);
13405                         goto out_unlocked;
13406                 }
13407                 if (sp) {
13408                         if (sp->msg_is_complete == 0) {
13409                                 strm->last_msg_incomplete = 1;
13410                                 if (stcb->asoc.idata_supported == 0) {
13411                                         asoc->stream_locked = 1;
13412                                         asoc->stream_locked_on = srcv->sinfo_stream;
13413                                 }
13414                         } else {
13415                                 sp->sender_all_done = 1;
13416                                 strm->last_msg_incomplete = 0;
13417                                 asoc->stream_locked = 0;
13418                         }
13419                 } else {
13420                         SCTP_PRINTF("Huh no sp TSNH?\n");
13421                         strm->last_msg_incomplete = 0;
13422                         asoc->stream_locked = 0;
13423                 }
13424                 SCTP_TCB_SEND_UNLOCK(stcb);
13425                 if (uio->uio_resid == 0) {
13426                         got_all_of_the_send = 1;
13427                 }
13428         } else {
13429                 /* We send in a 0, since we do NOT have any locks */
13430                 error = sctp_msg_append(stcb, net, top, srcv, 0);
13431                 top = NULL;
13432                 if (srcv->sinfo_flags & SCTP_EOF) {
13433                         /*
13434                          * This should only happen for Panda for the mbuf
13435                          * send case, which does NOT yet support EEOR mode.
13436                          * Thus, we can just set this flag to do the proper
13437                          * EOF handling.
13438                          */
13439                         got_all_of_the_send = 1;
13440                 }
13441         }
13442         if (error) {
13443                 goto out;
13444         }
13445 dataless_eof:
13446         /* EOF thing ? */
13447         if ((srcv->sinfo_flags & SCTP_EOF) &&
13448             (got_all_of_the_send == 1)) {
13449                 SCTP_STAT_INCR(sctps_sends_with_eof);
13450                 error = 0;
13451                 if (hold_tcblock == 0) {
13452                         SCTP_TCB_LOCK(stcb);
13453                         hold_tcblock = 1;
13454                 }
13455                 if (TAILQ_EMPTY(&asoc->send_queue) &&
13456                     TAILQ_EMPTY(&asoc->sent_queue) &&
13457                     sctp_is_there_unsent_data(stcb, SCTP_SO_LOCKED) == 0) {
13458                         if ((*asoc->ss_functions.sctp_ss_is_user_msgs_incomplete) (stcb, asoc)) {
13459                                 goto abort_anyway;
13460                         }
13461                         /* there is nothing queued to send, so I'm done... */
13462                         if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) &&
13463                             (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
13464                             (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
13465                                 struct sctp_nets *netp;
13466
13467                                 /* only send SHUTDOWN the first time through */
13468                                 if (SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) {
13469                                         SCTP_STAT_DECR_GAUGE32(sctps_currestab);
13470                                 }
13471                                 SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_SENT);
13472                                 SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING);
13473                                 sctp_stop_timers_for_shutdown(stcb);
13474                                 if (stcb->asoc.alternate) {
13475                                         netp = stcb->asoc.alternate;
13476                                 } else {
13477                                         netp = stcb->asoc.primary_destination;
13478                                 }
13479                                 sctp_send_shutdown(stcb, netp);
13480                                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb,
13481                                     netp);
13482                                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
13483                                     asoc->primary_destination);
13484                         }
13485                 } else {
13486                         /*-
13487                          * we still got (or just got) data to send, so set
13488                          * SHUTDOWN_PENDING
13489                          */
13490                         /*-
13491                          * XXX sockets draft says that SCTP_EOF should be
13492                          * sent with no data.  currently, we will allow user
13493                          * data to be sent first and move to
13494                          * SHUTDOWN-PENDING
13495                          */
13496                         if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) &&
13497                             (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
13498                             (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
13499                                 if (hold_tcblock == 0) {
13500                                         SCTP_TCB_LOCK(stcb);
13501                                         hold_tcblock = 1;
13502                                 }
13503                                 if ((*asoc->ss_functions.sctp_ss_is_user_msgs_incomplete) (stcb, asoc)) {
13504                                         asoc->state |= SCTP_STATE_PARTIAL_MSG_LEFT;
13505                                 }
13506                                 asoc->state |= SCTP_STATE_SHUTDOWN_PENDING;
13507                                 if (TAILQ_EMPTY(&asoc->send_queue) &&
13508                                     TAILQ_EMPTY(&asoc->sent_queue) &&
13509                                     (asoc->state & SCTP_STATE_PARTIAL_MSG_LEFT)) {
13510                                         struct mbuf *op_err;
13511                                         char msg[SCTP_DIAG_INFO_LEN];
13512
13513                         abort_anyway:
13514                                         if (free_cnt_applied) {
13515                                                 atomic_add_int(&stcb->asoc.refcnt, -1);
13516                                                 free_cnt_applied = 0;
13517                                         }
13518                                         snprintf(msg, sizeof(msg),
13519                                             "%s:%d at %s", __FILE__, __LINE__, __func__);
13520                                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
13521                                             msg);
13522                                         sctp_abort_an_association(stcb->sctp_ep, stcb,
13523                                             op_err, SCTP_SO_LOCKED);
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                                     asoc->primary_destination);
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->asoc) == SCTP_STATE_OPEN) {
13548                         /* a collision took us forward? */
13549                         queue_only = 0;
13550                 } else {
13551                         sctp_send_initiate(inp, stcb, SCTP_SO_LOCKED);
13552                         SCTP_SET_STATE(&stcb->asoc, SCTP_STATE_COOKIE_WAIT);
13553                         queue_only = 1;
13554                 }
13555         }
13556         if ((net->flight_size > net->cwnd) &&
13557             (stcb->asoc.sctp_cmt_on_off == 0)) {
13558                 SCTP_STAT_INCR(sctps_send_cwnd_avoid);
13559                 queue_only = 1;
13560         } else if (asoc->ifp_had_enobuf) {
13561                 SCTP_STAT_INCR(sctps_ifnomemqueued);
13562                 if (net->flight_size > (2 * net->mtu)) {
13563                         queue_only = 1;
13564                 }
13565                 asoc->ifp_had_enobuf = 0;
13566         }
13567         un_sent = stcb->asoc.total_output_queue_size - stcb->asoc.total_flight;
13568         if ((sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY)) &&
13569             (stcb->asoc.total_flight > 0) &&
13570             (stcb->asoc.stream_queue_cnt < SCTP_MAX_DATA_BUNDLING) &&
13571             (un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD))) {
13572                 /*-
13573                  * Ok, Nagle is set on and we have data outstanding.
13574                  * Don't send anything and let SACKs drive out the
13575                  * data unless wen have a "full" segment to send.
13576                  */
13577                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
13578                         sctp_log_nagle_event(stcb, SCTP_NAGLE_APPLIED);
13579                 }
13580                 SCTP_STAT_INCR(sctps_naglequeued);
13581                 nagle_applies = 1;
13582         } else {
13583                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
13584                         if (sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY))
13585                                 sctp_log_nagle_event(stcb, SCTP_NAGLE_SKIPPED);
13586                 }
13587                 SCTP_STAT_INCR(sctps_naglesent);
13588                 nagle_applies = 0;
13589         }
13590         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13591                 sctp_misc_ints(SCTP_CWNDLOG_PRESEND, queue_only_for_init, queue_only,
13592                     nagle_applies, un_sent);
13593                 sctp_misc_ints(SCTP_CWNDLOG_PRESEND, stcb->asoc.total_output_queue_size,
13594                     stcb->asoc.total_flight,
13595                     stcb->asoc.chunks_on_out_queue, stcb->asoc.total_flight_count);
13596         }
13597         if ((queue_only == 0) && (nagle_applies == 0) && (stcb->asoc.peers_rwnd && un_sent)) {
13598                 /* we can attempt to send too. */
13599                 if (hold_tcblock == 0) {
13600                         /*
13601                          * If there is activity recv'ing sacks no need to
13602                          * send
13603                          */
13604                         if (SCTP_TCB_TRYLOCK(stcb)) {
13605                                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13606                                 hold_tcblock = 1;
13607                         }
13608                 } else {
13609                         sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13610                 }
13611         } else if ((queue_only == 0) &&
13612                     (stcb->asoc.peers_rwnd == 0) &&
13613             (stcb->asoc.total_flight == 0)) {
13614                 /* We get to have a probe outstanding */
13615                 if (hold_tcblock == 0) {
13616                         hold_tcblock = 1;
13617                         SCTP_TCB_LOCK(stcb);
13618                 }
13619                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13620         } else if (some_on_control) {
13621                 int num_out, reason, frag_point;
13622
13623                 /* Here we do control only */
13624                 if (hold_tcblock == 0) {
13625                         hold_tcblock = 1;
13626                         SCTP_TCB_LOCK(stcb);
13627                 }
13628                 frag_point = sctp_get_frag_point(stcb, &stcb->asoc);
13629                 (void)sctp_med_chunk_output(inp, stcb, &stcb->asoc, &num_out,
13630                     &reason, 1, 1, &now, &now_filled, frag_point, SCTP_SO_LOCKED);
13631         }
13632         SCTPDBG(SCTP_DEBUG_OUTPUT1, "USR Send complete qo:%d prw:%d unsent:%d tf:%d cooq:%d toqs:%d err:%d\n",
13633             queue_only, stcb->asoc.peers_rwnd, un_sent,
13634             stcb->asoc.total_flight, stcb->asoc.chunks_on_out_queue,
13635             stcb->asoc.total_output_queue_size, error);
13636
13637 out:
13638 out_unlocked:
13639
13640         if (local_soresv && stcb) {
13641                 atomic_subtract_int(&stcb->asoc.sb_send_resv, sndlen);
13642         }
13643         if (create_lock_applied) {
13644                 SCTP_ASOC_CREATE_UNLOCK(inp);
13645         }
13646         if ((stcb) && hold_tcblock) {
13647                 SCTP_TCB_UNLOCK(stcb);
13648         }
13649         if (stcb && free_cnt_applied) {
13650                 atomic_add_int(&stcb->asoc.refcnt, -1);
13651         }
13652 #ifdef INVARIANTS
13653         if (stcb) {
13654                 if (mtx_owned(&stcb->tcb_mtx)) {
13655                         panic("Leaving with tcb mtx owned?");
13656                 }
13657                 if (mtx_owned(&stcb->tcb_send_mtx)) {
13658                         panic("Leaving with tcb send mtx owned?");
13659                 }
13660         }
13661 #endif
13662         if (top) {
13663                 sctp_m_freem(top);
13664         }
13665         if (control) {
13666                 sctp_m_freem(control);
13667         }
13668         return (error);
13669 }
13670
13671
13672 /*
13673  * generate an AUTHentication chunk, if required
13674  */
13675 struct mbuf *
13676 sctp_add_auth_chunk(struct mbuf *m, struct mbuf **m_end,
13677     struct sctp_auth_chunk **auth_ret, uint32_t *offset,
13678     struct sctp_tcb *stcb, uint8_t chunk)
13679 {
13680         struct mbuf *m_auth;
13681         struct sctp_auth_chunk *auth;
13682         int chunk_len;
13683         struct mbuf *cn;
13684
13685         if ((m_end == NULL) || (auth_ret == NULL) || (offset == NULL) ||
13686             (stcb == NULL))
13687                 return (m);
13688
13689         if (stcb->asoc.auth_supported == 0) {
13690                 return (m);
13691         }
13692         /* does the requested chunk require auth? */
13693         if (!sctp_auth_is_required_chunk(chunk, stcb->asoc.peer_auth_chunks)) {
13694                 return (m);
13695         }
13696         m_auth = sctp_get_mbuf_for_msg(sizeof(*auth), 0, M_NOWAIT, 1, MT_HEADER);
13697         if (m_auth == NULL) {
13698                 /* no mbuf's */
13699                 return (m);
13700         }
13701         /* reserve some space if this will be the first mbuf */
13702         if (m == NULL)
13703                 SCTP_BUF_RESV_UF(m_auth, SCTP_MIN_OVERHEAD);
13704         /* fill in the AUTH chunk details */
13705         auth = mtod(m_auth, struct sctp_auth_chunk *);
13706         memset(auth, 0, sizeof(*auth));
13707         auth->ch.chunk_type = SCTP_AUTHENTICATION;
13708         auth->ch.chunk_flags = 0;
13709         chunk_len = sizeof(*auth) +
13710             sctp_get_hmac_digest_len(stcb->asoc.peer_hmac_id);
13711         auth->ch.chunk_length = htons(chunk_len);
13712         auth->hmac_id = htons(stcb->asoc.peer_hmac_id);
13713         /* key id and hmac digest will be computed and filled in upon send */
13714
13715         /* save the offset where the auth was inserted into the chain */
13716         *offset = 0;
13717         for (cn = m; cn; cn = SCTP_BUF_NEXT(cn)) {
13718                 *offset += SCTP_BUF_LEN(cn);
13719         }
13720
13721         /* update length and return pointer to the auth chunk */
13722         SCTP_BUF_LEN(m_auth) = chunk_len;
13723         m = sctp_copy_mbufchain(m_auth, m, m_end, 1, chunk_len, 0);
13724         if (auth_ret != NULL)
13725                 *auth_ret = auth;
13726
13727         return (m);
13728 }
13729
13730 #ifdef INET6
13731 int
13732 sctp_v6src_match_nexthop(struct sockaddr_in6 *src6, sctp_route_t *ro)
13733 {
13734         struct nd_prefix *pfx = NULL;
13735         struct nd_pfxrouter *pfxrtr = NULL;
13736         struct sockaddr_in6 gw6;
13737
13738         if (ro == NULL || ro->ro_rt == NULL || src6->sin6_family != AF_INET6)
13739                 return (0);
13740
13741         /* get prefix entry of address */
13742         ND6_RLOCK();
13743         LIST_FOREACH(pfx, &MODULE_GLOBAL(nd_prefix), ndpr_entry) {
13744                 if (pfx->ndpr_stateflags & NDPRF_DETACHED)
13745                         continue;
13746                 if (IN6_ARE_MASKED_ADDR_EQUAL(&pfx->ndpr_prefix.sin6_addr,
13747                     &src6->sin6_addr, &pfx->ndpr_mask))
13748                         break;
13749         }
13750         /* no prefix entry in the prefix list */
13751         if (pfx == NULL) {
13752                 ND6_RUNLOCK();
13753                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "No prefix entry for ");
13754                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)src6);
13755                 return (0);
13756         }
13757         SCTPDBG(SCTP_DEBUG_OUTPUT2, "v6src_match_nexthop(), Prefix entry is ");
13758         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)src6);
13759
13760         /* search installed gateway from prefix entry */
13761         LIST_FOREACH(pfxrtr, &pfx->ndpr_advrtrs, pfr_entry) {
13762                 memset(&gw6, 0, sizeof(struct sockaddr_in6));
13763                 gw6.sin6_family = AF_INET6;
13764                 gw6.sin6_len = sizeof(struct sockaddr_in6);
13765                 memcpy(&gw6.sin6_addr, &pfxrtr->router->rtaddr,
13766                     sizeof(struct in6_addr));
13767                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "prefix router is ");
13768                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)&gw6);
13769                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "installed router is ");
13770                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, ro->ro_rt->rt_gateway);
13771                 if (sctp_cmpaddr((struct sockaddr *)&gw6, ro->ro_rt->rt_gateway)) {
13772                         ND6_RUNLOCK();
13773                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "pfxrouter is installed\n");
13774                         return (1);
13775                 }
13776         }
13777         ND6_RUNLOCK();
13778         SCTPDBG(SCTP_DEBUG_OUTPUT2, "pfxrouter is not installed\n");
13779         return (0);
13780 }
13781 #endif
13782
13783 int
13784 sctp_v4src_match_nexthop(struct sctp_ifa *sifa, sctp_route_t *ro)
13785 {
13786 #ifdef INET
13787         struct sockaddr_in *sin, *mask;
13788         struct ifaddr *ifa;
13789         struct in_addr srcnetaddr, gwnetaddr;
13790
13791         if (ro == NULL || ro->ro_rt == NULL ||
13792             sifa->address.sa.sa_family != AF_INET) {
13793                 return (0);
13794         }
13795         ifa = (struct ifaddr *)sifa->ifa;
13796         mask = (struct sockaddr_in *)(ifa->ifa_netmask);
13797         sin = &sifa->address.sin;
13798         srcnetaddr.s_addr = (sin->sin_addr.s_addr & mask->sin_addr.s_addr);
13799         SCTPDBG(SCTP_DEBUG_OUTPUT1, "match_nexthop4: src address is ");
13800         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, &sifa->address.sa);
13801         SCTPDBG(SCTP_DEBUG_OUTPUT1, "network address is %x\n", srcnetaddr.s_addr);
13802
13803         sin = (struct sockaddr_in *)ro->ro_rt->rt_gateway;
13804         gwnetaddr.s_addr = (sin->sin_addr.s_addr & mask->sin_addr.s_addr);
13805         SCTPDBG(SCTP_DEBUG_OUTPUT1, "match_nexthop4: nexthop is ");
13806         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, ro->ro_rt->rt_gateway);
13807         SCTPDBG(SCTP_DEBUG_OUTPUT1, "network address is %x\n", gwnetaddr.s_addr);
13808         if (srcnetaddr.s_addr == gwnetaddr.s_addr) {
13809                 return (1);
13810         }
13811 #endif
13812         return (0);
13813 }