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
2549         inp->next_addr_touse = starting_point;
2550         resettotop = 0;
2551 once_again_too:
2552         if (inp->next_addr_touse == NULL) {
2553                 inp->next_addr_touse = LIST_FIRST(&inp->sctp_addr_list);
2554                 resettotop = 1;
2555         }
2556
2557         /* ok, what about an acceptable address in the inp */
2558         for (laddr = inp->next_addr_touse; laddr;
2559             laddr = LIST_NEXT(laddr, sctp_nxt_addr)) {
2560                 if (laddr->ifa == NULL) {
2561                         /* address has been removed */
2562                         continue;
2563                 }
2564                 if (laddr->action == SCTP_DEL_IP_ADDRESS) {
2565                         /* address is being deleted */
2566                         continue;
2567                 }
2568                 sifa = sctp_is_ifa_addr_acceptable(laddr->ifa, dest_is_loop,
2569                     dest_is_priv, fam);
2570                 if (sifa == NULL)
2571                         continue;
2572                 atomic_add_int(&sifa->refcount, 1);
2573                 return (sifa);
2574         }
2575         if (resettotop == 0) {
2576                 inp->next_addr_touse = NULL;
2577                 goto once_again_too;
2578         }
2579
2580         /*
2581          * no address bound can be a source for the destination we are in
2582          * trouble
2583          */
2584         return (NULL);
2585 }
2586
2587
2588
2589 static struct sctp_ifa *
2590 sctp_choose_boundspecific_stcb(struct sctp_inpcb *inp,
2591     struct sctp_tcb *stcb,
2592     sctp_route_t * ro,
2593     uint32_t vrf_id,
2594     uint8_t dest_is_priv,
2595     uint8_t dest_is_loop,
2596     int non_asoc_addr_ok,
2597     sa_family_t fam)
2598 {
2599         struct sctp_laddr *laddr, *starting_point;
2600         void *ifn;
2601         struct sctp_ifn *sctp_ifn;
2602         struct sctp_ifa *sctp_ifa, *sifa;
2603         uint8_t start_at_beginning = 0;
2604         struct sctp_vrf *vrf;
2605         uint32_t ifn_index;
2606
2607         /*
2608          * first question, is the ifn we will emit on in our list, if so, we
2609          * want that one.
2610          */
2611         vrf = sctp_find_vrf(vrf_id);
2612         if (vrf == NULL)
2613                 return (NULL);
2614
2615         ifn = SCTP_GET_IFN_VOID_FROM_ROUTE(ro);
2616         ifn_index = SCTP_GET_IF_INDEX_FROM_ROUTE(ro);
2617         sctp_ifn = sctp_find_ifn(ifn, ifn_index);
2618
2619         /*
2620          * first question, is the ifn we will emit on in our list?  If so,
2621          * we want that one. First we look for a preferred. Second, we go
2622          * for an acceptable.
2623          */
2624         if (sctp_ifn) {
2625                 /* first try for a preferred address on the ep */
2626                 LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
2627 #ifdef INET
2628                         if ((sctp_ifa->address.sa.sa_family == AF_INET) &&
2629                             (prison_check_ip4(inp->ip_inp.inp.inp_cred,
2630                             &sctp_ifa->address.sin.sin_addr) != 0)) {
2631                                 continue;
2632                         }
2633 #endif
2634 #ifdef INET6
2635                         if ((sctp_ifa->address.sa.sa_family == AF_INET6) &&
2636                             (prison_check_ip6(inp->ip_inp.inp.inp_cred,
2637                             &sctp_ifa->address.sin6.sin6_addr) != 0)) {
2638                                 continue;
2639                         }
2640 #endif
2641                         if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) && (non_asoc_addr_ok == 0))
2642                                 continue;
2643                         if (sctp_is_addr_in_ep(inp, sctp_ifa)) {
2644                                 sifa = sctp_is_ifa_addr_preferred(sctp_ifa, dest_is_loop, dest_is_priv, fam);
2645                                 if (sifa == NULL)
2646                                         continue;
2647                                 if (((non_asoc_addr_ok == 0) &&
2648                                     (sctp_is_addr_restricted(stcb, sifa))) ||
2649                                     (non_asoc_addr_ok &&
2650                                     (sctp_is_addr_restricted(stcb, sifa)) &&
2651                                     (!sctp_is_addr_pending(stcb, sifa)))) {
2652                                         /* on the no-no list */
2653                                         continue;
2654                                 }
2655                                 atomic_add_int(&sifa->refcount, 1);
2656                                 return (sifa);
2657                         }
2658                 }
2659                 /* next try for an acceptable address on the ep */
2660                 LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
2661 #ifdef INET
2662                         if ((sctp_ifa->address.sa.sa_family == AF_INET) &&
2663                             (prison_check_ip4(inp->ip_inp.inp.inp_cred,
2664                             &sctp_ifa->address.sin.sin_addr) != 0)) {
2665                                 continue;
2666                         }
2667 #endif
2668 #ifdef INET6
2669                         if ((sctp_ifa->address.sa.sa_family == AF_INET6) &&
2670                             (prison_check_ip6(inp->ip_inp.inp.inp_cred,
2671                             &sctp_ifa->address.sin6.sin6_addr) != 0)) {
2672                                 continue;
2673                         }
2674 #endif
2675                         if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) && (non_asoc_addr_ok == 0))
2676                                 continue;
2677                         if (sctp_is_addr_in_ep(inp, sctp_ifa)) {
2678                                 sifa = sctp_is_ifa_addr_acceptable(sctp_ifa, dest_is_loop, dest_is_priv, fam);
2679                                 if (sifa == NULL)
2680                                         continue;
2681                                 if (((non_asoc_addr_ok == 0) &&
2682                                     (sctp_is_addr_restricted(stcb, sifa))) ||
2683                                     (non_asoc_addr_ok &&
2684                                     (sctp_is_addr_restricted(stcb, sifa)) &&
2685                                     (!sctp_is_addr_pending(stcb, sifa)))) {
2686                                         /* on the no-no list */
2687                                         continue;
2688                                 }
2689                                 atomic_add_int(&sifa->refcount, 1);
2690                                 return (sifa);
2691                         }
2692                 }
2693
2694         }
2695         /*
2696          * if we can't find one like that then we must look at all addresses
2697          * bound to pick one at first preferable then secondly acceptable.
2698          */
2699         starting_point = stcb->asoc.last_used_address;
2700 sctp_from_the_top:
2701         if (stcb->asoc.last_used_address == NULL) {
2702                 start_at_beginning = 1;
2703                 stcb->asoc.last_used_address = LIST_FIRST(&inp->sctp_addr_list);
2704         }
2705         /* search beginning with the last used address */
2706         for (laddr = stcb->asoc.last_used_address; laddr;
2707             laddr = LIST_NEXT(laddr, sctp_nxt_addr)) {
2708                 if (laddr->ifa == NULL) {
2709                         /* address has been removed */
2710                         continue;
2711                 }
2712                 if (laddr->action == SCTP_DEL_IP_ADDRESS) {
2713                         /* address is being deleted */
2714                         continue;
2715                 }
2716                 sifa = sctp_is_ifa_addr_preferred(laddr->ifa, dest_is_loop, dest_is_priv, fam);
2717                 if (sifa == NULL)
2718                         continue;
2719                 if (((non_asoc_addr_ok == 0) &&
2720                     (sctp_is_addr_restricted(stcb, sifa))) ||
2721                     (non_asoc_addr_ok &&
2722                     (sctp_is_addr_restricted(stcb, sifa)) &&
2723                     (!sctp_is_addr_pending(stcb, sifa)))) {
2724                         /* on the no-no list */
2725                         continue;
2726                 }
2727                 stcb->asoc.last_used_address = laddr;
2728                 atomic_add_int(&sifa->refcount, 1);
2729                 return (sifa);
2730         }
2731         if (start_at_beginning == 0) {
2732                 stcb->asoc.last_used_address = NULL;
2733                 goto sctp_from_the_top;
2734         }
2735         /* now try for any higher scope than the destination */
2736         stcb->asoc.last_used_address = starting_point;
2737         start_at_beginning = 0;
2738 sctp_from_the_top2:
2739         if (stcb->asoc.last_used_address == NULL) {
2740                 start_at_beginning = 1;
2741                 stcb->asoc.last_used_address = LIST_FIRST(&inp->sctp_addr_list);
2742         }
2743         /* search beginning with the last used address */
2744         for (laddr = stcb->asoc.last_used_address; laddr;
2745             laddr = LIST_NEXT(laddr, sctp_nxt_addr)) {
2746                 if (laddr->ifa == NULL) {
2747                         /* address has been removed */
2748                         continue;
2749                 }
2750                 if (laddr->action == SCTP_DEL_IP_ADDRESS) {
2751                         /* address is being deleted */
2752                         continue;
2753                 }
2754                 sifa = sctp_is_ifa_addr_acceptable(laddr->ifa, dest_is_loop,
2755                     dest_is_priv, fam);
2756                 if (sifa == NULL)
2757                         continue;
2758                 if (((non_asoc_addr_ok == 0) &&
2759                     (sctp_is_addr_restricted(stcb, sifa))) ||
2760                     (non_asoc_addr_ok &&
2761                     (sctp_is_addr_restricted(stcb, sifa)) &&
2762                     (!sctp_is_addr_pending(stcb, sifa)))) {
2763                         /* on the no-no list */
2764                         continue;
2765                 }
2766                 stcb->asoc.last_used_address = laddr;
2767                 atomic_add_int(&sifa->refcount, 1);
2768                 return (sifa);
2769         }
2770         if (start_at_beginning == 0) {
2771                 stcb->asoc.last_used_address = NULL;
2772                 goto sctp_from_the_top2;
2773         }
2774         return (NULL);
2775 }
2776
2777 static struct sctp_ifa *
2778 sctp_select_nth_preferred_addr_from_ifn_boundall(struct sctp_ifn *ifn,
2779     struct sctp_inpcb *inp,
2780     struct sctp_tcb *stcb,
2781     int non_asoc_addr_ok,
2782     uint8_t dest_is_loop,
2783     uint8_t dest_is_priv,
2784     int addr_wanted,
2785     sa_family_t fam,
2786     sctp_route_t * ro
2787 )
2788 {
2789         struct sctp_ifa *ifa, *sifa;
2790         int num_eligible_addr = 0;
2791 #ifdef INET6
2792         struct sockaddr_in6 sin6, lsa6;
2793
2794         if (fam == AF_INET6) {
2795                 memcpy(&sin6, &ro->ro_dst, sizeof(struct sockaddr_in6));
2796                 (void)sa6_recoverscope(&sin6);
2797         }
2798 #endif                          /* INET6 */
2799         LIST_FOREACH(ifa, &ifn->ifalist, next_ifa) {
2800 #ifdef INET
2801                 if ((ifa->address.sa.sa_family == AF_INET) &&
2802                     (prison_check_ip4(inp->ip_inp.inp.inp_cred,
2803                     &ifa->address.sin.sin_addr) != 0)) {
2804                         continue;
2805                 }
2806 #endif
2807 #ifdef INET6
2808                 if ((ifa->address.sa.sa_family == AF_INET6) &&
2809                     (prison_check_ip6(inp->ip_inp.inp.inp_cred,
2810                     &ifa->address.sin6.sin6_addr) != 0)) {
2811                         continue;
2812                 }
2813 #endif
2814                 if ((ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
2815                     (non_asoc_addr_ok == 0))
2816                         continue;
2817                 sifa = sctp_is_ifa_addr_preferred(ifa, dest_is_loop,
2818                     dest_is_priv, fam);
2819                 if (sifa == NULL)
2820                         continue;
2821 #ifdef INET6
2822                 if (fam == AF_INET6 &&
2823                     dest_is_loop &&
2824                     sifa->src_is_loop && sifa->src_is_priv) {
2825                         /*
2826                          * don't allow fe80::1 to be a src on loop ::1, we
2827                          * don't list it to the peer so we will get an
2828                          * abort.
2829                          */
2830                         continue;
2831                 }
2832                 if (fam == AF_INET6 &&
2833                     IN6_IS_ADDR_LINKLOCAL(&sifa->address.sin6.sin6_addr) &&
2834                     IN6_IS_ADDR_LINKLOCAL(&sin6.sin6_addr)) {
2835                         /*
2836                          * link-local <-> link-local must belong to the same
2837                          * scope.
2838                          */
2839                         memcpy(&lsa6, &sifa->address.sin6, sizeof(struct sockaddr_in6));
2840                         (void)sa6_recoverscope(&lsa6);
2841                         if (sin6.sin6_scope_id != lsa6.sin6_scope_id) {
2842                                 continue;
2843                         }
2844                 }
2845 #endif                          /* INET6 */
2846
2847                 /*
2848                  * Check if the IPv6 address matches to next-hop. In the
2849                  * mobile case, old IPv6 address may be not deleted from the
2850                  * interface. Then, the interface has previous and new
2851                  * addresses.  We should use one corresponding to the
2852                  * next-hop.  (by micchie)
2853                  */
2854 #ifdef INET6
2855                 if (stcb && fam == AF_INET6 &&
2856                     sctp_is_mobility_feature_on(stcb->sctp_ep, SCTP_MOBILITY_BASE)) {
2857                         if (sctp_v6src_match_nexthop(&sifa->address.sin6, ro)
2858                             == 0) {
2859                                 continue;
2860                         }
2861                 }
2862 #endif
2863 #ifdef INET
2864                 /* Avoid topologically incorrect IPv4 address */
2865                 if (stcb && fam == AF_INET &&
2866                     sctp_is_mobility_feature_on(stcb->sctp_ep, SCTP_MOBILITY_BASE)) {
2867                         if (sctp_v4src_match_nexthop(sifa, ro) == 0) {
2868                                 continue;
2869                         }
2870                 }
2871 #endif
2872                 if (stcb) {
2873                         if (sctp_is_address_in_scope(ifa, &stcb->asoc.scope, 0) == 0) {
2874                                 continue;
2875                         }
2876                         if (((non_asoc_addr_ok == 0) &&
2877                             (sctp_is_addr_restricted(stcb, sifa))) ||
2878                             (non_asoc_addr_ok &&
2879                             (sctp_is_addr_restricted(stcb, sifa)) &&
2880                             (!sctp_is_addr_pending(stcb, sifa)))) {
2881                                 /*
2882                                  * It is restricted for some reason..
2883                                  * probably not yet added.
2884                                  */
2885                                 continue;
2886                         }
2887                 }
2888                 if (num_eligible_addr >= addr_wanted) {
2889                         return (sifa);
2890                 }
2891                 num_eligible_addr++;
2892         }
2893         return (NULL);
2894 }
2895
2896
2897 static int
2898 sctp_count_num_preferred_boundall(struct sctp_ifn *ifn,
2899     struct sctp_inpcb *inp,
2900     struct sctp_tcb *stcb,
2901     int non_asoc_addr_ok,
2902     uint8_t dest_is_loop,
2903     uint8_t dest_is_priv,
2904     sa_family_t fam)
2905 {
2906         struct sctp_ifa *ifa, *sifa;
2907         int num_eligible_addr = 0;
2908
2909         LIST_FOREACH(ifa, &ifn->ifalist, next_ifa) {
2910 #ifdef INET
2911                 if ((ifa->address.sa.sa_family == AF_INET) &&
2912                     (prison_check_ip4(inp->ip_inp.inp.inp_cred,
2913                     &ifa->address.sin.sin_addr) != 0)) {
2914                         continue;
2915                 }
2916 #endif
2917 #ifdef INET6
2918                 if ((ifa->address.sa.sa_family == AF_INET6) &&
2919                     (stcb != NULL) &&
2920                     (prison_check_ip6(inp->ip_inp.inp.inp_cred,
2921                     &ifa->address.sin6.sin6_addr) != 0)) {
2922                         continue;
2923                 }
2924 #endif
2925                 if ((ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
2926                     (non_asoc_addr_ok == 0)) {
2927                         continue;
2928                 }
2929                 sifa = sctp_is_ifa_addr_preferred(ifa, dest_is_loop,
2930                     dest_is_priv, fam);
2931                 if (sifa == NULL) {
2932                         continue;
2933                 }
2934                 if (stcb) {
2935                         if (sctp_is_address_in_scope(ifa, &stcb->asoc.scope, 0) == 0) {
2936                                 continue;
2937                         }
2938                         if (((non_asoc_addr_ok == 0) &&
2939                             (sctp_is_addr_restricted(stcb, sifa))) ||
2940                             (non_asoc_addr_ok &&
2941                             (sctp_is_addr_restricted(stcb, sifa)) &&
2942                             (!sctp_is_addr_pending(stcb, sifa)))) {
2943                                 /*
2944                                  * It is restricted for some reason..
2945                                  * probably not yet added.
2946                                  */
2947                                 continue;
2948                         }
2949                 }
2950                 num_eligible_addr++;
2951         }
2952         return (num_eligible_addr);
2953 }
2954
2955 static struct sctp_ifa *
2956 sctp_choose_boundall(struct sctp_inpcb *inp,
2957     struct sctp_tcb *stcb,
2958     struct sctp_nets *net,
2959     sctp_route_t * ro,
2960     uint32_t vrf_id,
2961     uint8_t dest_is_priv,
2962     uint8_t dest_is_loop,
2963     int non_asoc_addr_ok,
2964     sa_family_t fam)
2965 {
2966         int cur_addr_num = 0, num_preferred = 0;
2967         void *ifn;
2968         struct sctp_ifn *sctp_ifn, *looked_at = NULL, *emit_ifn;
2969         struct sctp_ifa *sctp_ifa, *sifa;
2970         uint32_t ifn_index;
2971         struct sctp_vrf *vrf;
2972 #ifdef INET
2973         int retried = 0;
2974 #endif
2975
2976         /*-
2977          * For boundall we can use any address in the association.
2978          * If non_asoc_addr_ok is set we can use any address (at least in
2979          * theory). So we look for preferred addresses first. If we find one,
2980          * we use it. Otherwise we next try to get an address on the
2981          * interface, which we should be able to do (unless non_asoc_addr_ok
2982          * is false and we are routed out that way). In these cases where we
2983          * can't use the address of the interface we go through all the
2984          * ifn's looking for an address we can use and fill that in. Punting
2985          * means we send back address 0, which will probably cause problems
2986          * actually since then IP will fill in the address of the route ifn,
2987          * which means we probably already rejected it.. i.e. here comes an
2988          * abort :-<.
2989          */
2990         vrf = sctp_find_vrf(vrf_id);
2991         if (vrf == NULL)
2992                 return (NULL);
2993
2994         ifn = SCTP_GET_IFN_VOID_FROM_ROUTE(ro);
2995         ifn_index = SCTP_GET_IF_INDEX_FROM_ROUTE(ro);
2996         SCTPDBG(SCTP_DEBUG_OUTPUT2, "ifn from route:%p ifn_index:%d\n", ifn, ifn_index);
2997         emit_ifn = looked_at = sctp_ifn = sctp_find_ifn(ifn, ifn_index);
2998         if (sctp_ifn == NULL) {
2999                 /* ?? We don't have this guy ?? */
3000                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "No ifn emit interface?\n");
3001                 goto bound_all_plan_b;
3002         }
3003         SCTPDBG(SCTP_DEBUG_OUTPUT2, "ifn_index:%d name:%s is emit interface\n",
3004             ifn_index, sctp_ifn->ifn_name);
3005
3006         if (net) {
3007                 cur_addr_num = net->indx_of_eligible_next_to_use;
3008         }
3009         num_preferred = sctp_count_num_preferred_boundall(sctp_ifn,
3010             inp, stcb,
3011             non_asoc_addr_ok,
3012             dest_is_loop,
3013             dest_is_priv, fam);
3014         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Found %d preferred source addresses for intf:%s\n",
3015             num_preferred, sctp_ifn->ifn_name);
3016         if (num_preferred == 0) {
3017                 /*
3018                  * no eligible addresses, we must use some other interface
3019                  * address if we can find one.
3020                  */
3021                 goto bound_all_plan_b;
3022         }
3023         /*
3024          * Ok we have num_eligible_addr set with how many we can use, this
3025          * may vary from call to call due to addresses being deprecated
3026          * etc..
3027          */
3028         if (cur_addr_num >= num_preferred) {
3029                 cur_addr_num = 0;
3030         }
3031         /*
3032          * select the nth address from the list (where cur_addr_num is the
3033          * nth) and 0 is the first one, 1 is the second one etc...
3034          */
3035         SCTPDBG(SCTP_DEBUG_OUTPUT2, "cur_addr_num:%d\n", cur_addr_num);
3036
3037         sctp_ifa = sctp_select_nth_preferred_addr_from_ifn_boundall(sctp_ifn, inp, stcb, non_asoc_addr_ok, dest_is_loop,
3038             dest_is_priv, cur_addr_num, fam, ro);
3039
3040         /* if sctp_ifa is NULL something changed??, fall to plan b. */
3041         if (sctp_ifa) {
3042                 atomic_add_int(&sctp_ifa->refcount, 1);
3043                 if (net) {
3044                         /* save off where the next one we will want */
3045                         net->indx_of_eligible_next_to_use = cur_addr_num + 1;
3046                 }
3047                 return (sctp_ifa);
3048         }
3049         /*
3050          * plan_b: Look at all interfaces and find a preferred address. If
3051          * no preferred fall through to plan_c.
3052          */
3053 bound_all_plan_b:
3054         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Trying Plan B\n");
3055         LIST_FOREACH(sctp_ifn, &vrf->ifnlist, next_ifn) {
3056                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "Examine interface %s\n",
3057                     sctp_ifn->ifn_name);
3058                 if (dest_is_loop == 0 && SCTP_IFN_IS_IFT_LOOP(sctp_ifn)) {
3059                         /* wrong base scope */
3060                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "skip\n");
3061                         continue;
3062                 }
3063                 if ((sctp_ifn == looked_at) && looked_at) {
3064                         /* already looked at this guy */
3065                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "already seen\n");
3066                         continue;
3067                 }
3068                 num_preferred = sctp_count_num_preferred_boundall(sctp_ifn, inp, stcb, non_asoc_addr_ok,
3069                     dest_is_loop, dest_is_priv, fam);
3070                 SCTPDBG(SCTP_DEBUG_OUTPUT2,
3071                     "Found ifn:%p %d preferred source addresses\n",
3072                     ifn, num_preferred);
3073                 if (num_preferred == 0) {
3074                         /* None on this interface. */
3075                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "No preferred -- skipping to next\n");
3076                         continue;
3077                 }
3078                 SCTPDBG(SCTP_DEBUG_OUTPUT2,
3079                     "num preferred:%d on interface:%p cur_addr_num:%d\n",
3080                     num_preferred, (void *)sctp_ifn, cur_addr_num);
3081
3082                 /*
3083                  * Ok we have num_eligible_addr set with how many we can
3084                  * use, this may vary from call to call due to addresses
3085                  * being deprecated etc..
3086                  */
3087                 if (cur_addr_num >= num_preferred) {
3088                         cur_addr_num = 0;
3089                 }
3090                 sifa = sctp_select_nth_preferred_addr_from_ifn_boundall(sctp_ifn, inp, stcb, non_asoc_addr_ok, dest_is_loop,
3091                     dest_is_priv, cur_addr_num, fam, ro);
3092                 if (sifa == NULL)
3093                         continue;
3094                 if (net) {
3095                         net->indx_of_eligible_next_to_use = cur_addr_num + 1;
3096                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "we selected %d\n",
3097                             cur_addr_num);
3098                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Source:");
3099                         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, &sifa->address.sa);
3100                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Dest:");
3101                         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, &net->ro._l_addr.sa);
3102                 }
3103                 atomic_add_int(&sifa->refcount, 1);
3104                 return (sifa);
3105         }
3106 #ifdef INET
3107 again_with_private_addresses_allowed:
3108 #endif
3109         /* plan_c: do we have an acceptable address on the emit interface */
3110         sifa = NULL;
3111         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Trying Plan C: find acceptable on interface\n");
3112         if (emit_ifn == NULL) {
3113                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "Jump to Plan D - no emit_ifn\n");
3114                 goto plan_d;
3115         }
3116         LIST_FOREACH(sctp_ifa, &emit_ifn->ifalist, next_ifa) {
3117                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "ifa:%p\n", (void *)sctp_ifa);
3118 #ifdef INET
3119                 if ((sctp_ifa->address.sa.sa_family == AF_INET) &&
3120                     (prison_check_ip4(inp->ip_inp.inp.inp_cred,
3121                     &sctp_ifa->address.sin.sin_addr) != 0)) {
3122                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Jailed\n");
3123                         continue;
3124                 }
3125 #endif
3126 #ifdef INET6
3127                 if ((sctp_ifa->address.sa.sa_family == AF_INET6) &&
3128                     (prison_check_ip6(inp->ip_inp.inp.inp_cred,
3129                     &sctp_ifa->address.sin6.sin6_addr) != 0)) {
3130                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Jailed\n");
3131                         continue;
3132                 }
3133 #endif
3134                 if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
3135                     (non_asoc_addr_ok == 0)) {
3136                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Defer\n");
3137                         continue;
3138                 }
3139                 sifa = sctp_is_ifa_addr_acceptable(sctp_ifa, dest_is_loop,
3140                     dest_is_priv, fam);
3141                 if (sifa == NULL) {
3142                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "IFA not acceptable\n");
3143                         continue;
3144                 }
3145                 if (stcb) {
3146                         if (sctp_is_address_in_scope(sifa, &stcb->asoc.scope, 0) == 0) {
3147                                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "NOT in scope\n");
3148                                 sifa = NULL;
3149                                 continue;
3150                         }
3151                         if (((non_asoc_addr_ok == 0) &&
3152                             (sctp_is_addr_restricted(stcb, sifa))) ||
3153                             (non_asoc_addr_ok &&
3154                             (sctp_is_addr_restricted(stcb, sifa)) &&
3155                             (!sctp_is_addr_pending(stcb, sifa)))) {
3156                                 /*
3157                                  * It is restricted for some reason..
3158                                  * probably not yet added.
3159                                  */
3160                                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "Its restricted\n");
3161                                 sifa = NULL;
3162                                 continue;
3163                         }
3164                 }
3165                 atomic_add_int(&sifa->refcount, 1);
3166                 goto out;
3167         }
3168 plan_d:
3169         /*
3170          * plan_d: We are in trouble. No preferred address on the emit
3171          * interface. And not even a preferred address on all interfaces. Go
3172          * out and see if we can find an acceptable address somewhere
3173          * amongst all interfaces.
3174          */
3175         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Trying Plan D looked_at is %p\n", (void *)looked_at);
3176         LIST_FOREACH(sctp_ifn, &vrf->ifnlist, next_ifn) {
3177                 if (dest_is_loop == 0 && SCTP_IFN_IS_IFT_LOOP(sctp_ifn)) {
3178                         /* wrong base scope */
3179                         continue;
3180                 }
3181                 LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
3182 #ifdef INET
3183                         if ((sctp_ifa->address.sa.sa_family == AF_INET) &&
3184                             (prison_check_ip4(inp->ip_inp.inp.inp_cred,
3185                             &sctp_ifa->address.sin.sin_addr) != 0)) {
3186                                 continue;
3187                         }
3188 #endif
3189 #ifdef INET6
3190                         if ((sctp_ifa->address.sa.sa_family == AF_INET6) &&
3191                             (prison_check_ip6(inp->ip_inp.inp.inp_cred,
3192                             &sctp_ifa->address.sin6.sin6_addr) != 0)) {
3193                                 continue;
3194                         }
3195 #endif
3196                         if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
3197                             (non_asoc_addr_ok == 0))
3198                                 continue;
3199                         sifa = sctp_is_ifa_addr_acceptable(sctp_ifa,
3200                             dest_is_loop,
3201                             dest_is_priv, fam);
3202                         if (sifa == NULL)
3203                                 continue;
3204                         if (stcb) {
3205                                 if (sctp_is_address_in_scope(sifa, &stcb->asoc.scope, 0) == 0) {
3206                                         sifa = NULL;
3207                                         continue;
3208                                 }
3209                                 if (((non_asoc_addr_ok == 0) &&
3210                                     (sctp_is_addr_restricted(stcb, sifa))) ||
3211                                     (non_asoc_addr_ok &&
3212                                     (sctp_is_addr_restricted(stcb, sifa)) &&
3213                                     (!sctp_is_addr_pending(stcb, sifa)))) {
3214                                         /*
3215                                          * It is restricted for some
3216                                          * reason.. probably not yet added.
3217                                          */
3218                                         sifa = NULL;
3219                                         continue;
3220                                 }
3221                         }
3222                         goto out;
3223                 }
3224         }
3225 #ifdef INET
3226         if (stcb) {
3227                 if ((retried == 0) && (stcb->asoc.scope.ipv4_local_scope == 0)) {
3228                         stcb->asoc.scope.ipv4_local_scope = 1;
3229                         retried = 1;
3230                         goto again_with_private_addresses_allowed;
3231                 } else if (retried == 1) {
3232                         stcb->asoc.scope.ipv4_local_scope = 0;
3233                 }
3234         }
3235 #endif
3236 out:
3237 #ifdef INET
3238         if (sifa) {
3239                 if (retried == 1) {
3240                         LIST_FOREACH(sctp_ifn, &vrf->ifnlist, next_ifn) {
3241                                 if (dest_is_loop == 0 && SCTP_IFN_IS_IFT_LOOP(sctp_ifn)) {
3242                                         /* wrong base scope */
3243                                         continue;
3244                                 }
3245                                 LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
3246                                         struct sctp_ifa *tmp_sifa;
3247
3248 #ifdef INET
3249                                         if ((sctp_ifa->address.sa.sa_family == AF_INET) &&
3250                                             (prison_check_ip4(inp->ip_inp.inp.inp_cred,
3251                                             &sctp_ifa->address.sin.sin_addr) != 0)) {
3252                                                 continue;
3253                                         }
3254 #endif
3255 #ifdef INET6
3256                                         if ((sctp_ifa->address.sa.sa_family == AF_INET6) &&
3257                                             (prison_check_ip6(inp->ip_inp.inp.inp_cred,
3258                                             &sctp_ifa->address.sin6.sin6_addr) != 0)) {
3259                                                 continue;
3260                                         }
3261 #endif
3262                                         if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
3263                                             (non_asoc_addr_ok == 0))
3264                                                 continue;
3265                                         tmp_sifa = sctp_is_ifa_addr_acceptable(sctp_ifa,
3266                                             dest_is_loop,
3267                                             dest_is_priv, fam);
3268                                         if (tmp_sifa == NULL) {
3269                                                 continue;
3270                                         }
3271                                         if (tmp_sifa == sifa) {
3272                                                 continue;
3273                                         }
3274                                         if (stcb) {
3275                                                 if (sctp_is_address_in_scope(tmp_sifa,
3276                                                     &stcb->asoc.scope, 0) == 0) {
3277                                                         continue;
3278                                                 }
3279                                                 if (((non_asoc_addr_ok == 0) &&
3280                                                     (sctp_is_addr_restricted(stcb, tmp_sifa))) ||
3281                                                     (non_asoc_addr_ok &&
3282                                                     (sctp_is_addr_restricted(stcb, tmp_sifa)) &&
3283                                                     (!sctp_is_addr_pending(stcb, tmp_sifa)))) {
3284                                                         /*
3285                                                          * It is restricted
3286                                                          * for some reason..
3287                                                          * probably not yet
3288                                                          * added.
3289                                                          */
3290                                                         continue;
3291                                                 }
3292                                         }
3293                                         if ((tmp_sifa->address.sin.sin_family == AF_INET) &&
3294                                             (IN4_ISPRIVATE_ADDRESS(&(tmp_sifa->address.sin.sin_addr)))) {
3295                                                 sctp_add_local_addr_restricted(stcb, tmp_sifa);
3296                                         }
3297                                 }
3298                         }
3299                 }
3300                 atomic_add_int(&sifa->refcount, 1);
3301         }
3302 #endif
3303         return (sifa);
3304 }
3305
3306
3307
3308 /* tcb may be NULL */
3309 struct sctp_ifa *
3310 sctp_source_address_selection(struct sctp_inpcb *inp,
3311     struct sctp_tcb *stcb,
3312     sctp_route_t * ro,
3313     struct sctp_nets *net,
3314     int non_asoc_addr_ok, uint32_t vrf_id)
3315 {
3316         struct sctp_ifa *answer;
3317         uint8_t dest_is_priv, dest_is_loop;
3318         sa_family_t fam;
3319 #ifdef INET
3320         struct sockaddr_in *to = (struct sockaddr_in *)&ro->ro_dst;
3321 #endif
3322 #ifdef INET6
3323         struct sockaddr_in6 *to6 = (struct sockaddr_in6 *)&ro->ro_dst;
3324 #endif
3325
3326         /**
3327          * Rules:
3328          * - Find the route if needed, cache if I can.
3329          * - Look at interface address in route, Is it in the bound list. If so we
3330          *   have the best source.
3331          * - If not we must rotate amongst the addresses.
3332          *
3333          * Cavets and issues
3334          *
3335          * Do we need to pay attention to scope. We can have a private address
3336          * or a global address we are sourcing or sending to. So if we draw
3337          * it out
3338          * zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz
3339          * For V4
3340          * ------------------------------------------
3341          *      source     *      dest  *  result
3342          * -----------------------------------------
3343          * <a>  Private    *    Global  *  NAT
3344          * -----------------------------------------
3345          * <b>  Private    *    Private *  No problem
3346          * -----------------------------------------
3347          * <c>  Global     *    Private *  Huh, How will this work?
3348          * -----------------------------------------
3349          * <d>  Global     *    Global  *  No Problem
3350          *------------------------------------------
3351          * zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz
3352          * For V6
3353          *------------------------------------------
3354          *      source     *      dest  *  result
3355          * -----------------------------------------
3356          * <a>  Linklocal  *    Global  *
3357          * -----------------------------------------
3358          * <b>  Linklocal  * Linklocal  *  No problem
3359          * -----------------------------------------
3360          * <c>  Global     * Linklocal  *  Huh, How will this work?
3361          * -----------------------------------------
3362          * <d>  Global     *    Global  *  No Problem
3363          *------------------------------------------
3364          * zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz
3365          *
3366          * And then we add to that what happens if there are multiple addresses
3367          * assigned to an interface. Remember the ifa on a ifn is a linked
3368          * list of addresses. So one interface can have more than one IP
3369          * address. What happens if we have both a private and a global
3370          * address? Do we then use context of destination to sort out which
3371          * one is best? And what about NAT's sending P->G may get you a NAT
3372          * translation, or should you select the G thats on the interface in
3373          * preference.
3374          *
3375          * Decisions:
3376          *
3377          * - count the number of addresses on the interface.
3378          * - if it is one, no problem except case <c>.
3379          *   For <a> we will assume a NAT out there.
3380          * - if there are more than one, then we need to worry about scope P
3381          *   or G. We should prefer G -> G and P -> P if possible.
3382          *   Then as a secondary fall back to mixed types G->P being a last
3383          *   ditch one.
3384          * - The above all works for bound all, but bound specific we need to
3385          *   use the same concept but instead only consider the bound
3386          *   addresses. If the bound set is NOT assigned to the interface then
3387          *   we must use rotation amongst the bound addresses..
3388          */
3389         if (ro->ro_rt == NULL) {
3390                 /*
3391                  * Need a route to cache.
3392                  */
3393                 SCTP_RTALLOC(ro, vrf_id, inp->fibnum);
3394         }
3395         if (ro->ro_rt == NULL) {
3396                 return (NULL);
3397         }
3398         fam = ro->ro_dst.sa_family;
3399         dest_is_priv = dest_is_loop = 0;
3400         /* Setup our scopes for the destination */
3401         switch (fam) {
3402 #ifdef INET
3403         case AF_INET:
3404                 /* Scope based on outbound address */
3405                 if (IN4_ISLOOPBACK_ADDRESS(&to->sin_addr)) {
3406                         dest_is_loop = 1;
3407                         if (net != NULL) {
3408                                 /* mark it as local */
3409                                 net->addr_is_local = 1;
3410                         }
3411                 } else if ((IN4_ISPRIVATE_ADDRESS(&to->sin_addr))) {
3412                         dest_is_priv = 1;
3413                 }
3414                 break;
3415 #endif
3416 #ifdef INET6
3417         case AF_INET6:
3418                 /* Scope based on outbound address */
3419                 if (IN6_IS_ADDR_LOOPBACK(&to6->sin6_addr) ||
3420                     SCTP_ROUTE_IS_REAL_LOOP(ro)) {
3421                         /*
3422                          * If the address is a loopback address, which
3423                          * consists of "::1" OR "fe80::1%lo0", we are
3424                          * loopback scope. But we don't use dest_is_priv
3425                          * (link local addresses).
3426                          */
3427                         dest_is_loop = 1;
3428                         if (net != NULL) {
3429                                 /* mark it as local */
3430                                 net->addr_is_local = 1;
3431                         }
3432                 } else if (IN6_IS_ADDR_LINKLOCAL(&to6->sin6_addr)) {
3433                         dest_is_priv = 1;
3434                 }
3435                 break;
3436 #endif
3437         }
3438         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Select source addr for:");
3439         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)&ro->ro_dst);
3440         SCTP_IPI_ADDR_RLOCK();
3441         if (inp->sctp_flags & SCTP_PCB_FLAGS_BOUNDALL) {
3442                 /*
3443                  * Bound all case
3444                  */
3445                 answer = sctp_choose_boundall(inp, stcb, net, ro, vrf_id,
3446                     dest_is_priv, dest_is_loop,
3447                     non_asoc_addr_ok, fam);
3448                 SCTP_IPI_ADDR_RUNLOCK();
3449                 return (answer);
3450         }
3451         /*
3452          * Subset bound case
3453          */
3454         if (stcb) {
3455                 answer = sctp_choose_boundspecific_stcb(inp, stcb, ro,
3456                     vrf_id, dest_is_priv,
3457                     dest_is_loop,
3458                     non_asoc_addr_ok, fam);
3459         } else {
3460                 answer = sctp_choose_boundspecific_inp(inp, ro, vrf_id,
3461                     non_asoc_addr_ok,
3462                     dest_is_priv,
3463                     dest_is_loop, fam);
3464         }
3465         SCTP_IPI_ADDR_RUNLOCK();
3466         return (answer);
3467 }
3468
3469 static int
3470 sctp_find_cmsg(int c_type, void *data, struct mbuf *control, size_t cpsize)
3471 {
3472         struct cmsghdr cmh;
3473         struct sctp_sndinfo sndinfo;
3474         struct sctp_prinfo prinfo;
3475         struct sctp_authinfo authinfo;
3476         int tot_len, rem_len, cmsg_data_len, cmsg_data_off, off;
3477         int found;
3478
3479         /*
3480          * Independent of how many mbufs, find the c_type inside the control
3481          * structure and copy out the data.
3482          */
3483         found = 0;
3484         tot_len = SCTP_BUF_LEN(control);
3485         for (off = 0; off < tot_len; off += CMSG_ALIGN(cmh.cmsg_len)) {
3486                 rem_len = tot_len - off;
3487                 if (rem_len < (int)CMSG_ALIGN(sizeof(cmh))) {
3488                         /* There is not enough room for one more. */
3489                         return (found);
3490                 }
3491                 m_copydata(control, off, sizeof(cmh), (caddr_t)&cmh);
3492                 if (cmh.cmsg_len < CMSG_ALIGN(sizeof(cmh))) {
3493                         /* We dont't have a complete CMSG header. */
3494                         return (found);
3495                 }
3496                 if ((cmh.cmsg_len > INT_MAX) || ((int)cmh.cmsg_len > rem_len)) {
3497                         /* We don't have the complete CMSG. */
3498                         return (found);
3499                 }
3500                 cmsg_data_len = (int)cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh));
3501                 cmsg_data_off = off + CMSG_ALIGN(sizeof(cmh));
3502                 if ((cmh.cmsg_level == IPPROTO_SCTP) &&
3503                     ((c_type == cmh.cmsg_type) ||
3504                     ((c_type == SCTP_SNDRCV) &&
3505                     ((cmh.cmsg_type == SCTP_SNDINFO) ||
3506                     (cmh.cmsg_type == SCTP_PRINFO) ||
3507                     (cmh.cmsg_type == SCTP_AUTHINFO))))) {
3508                         if (c_type == cmh.cmsg_type) {
3509                                 if (cpsize > INT_MAX) {
3510                                         return (found);
3511                                 }
3512                                 if (cmsg_data_len < (int)cpsize) {
3513                                         return (found);
3514                                 }
3515                                 /* It is exactly what we want. Copy it out. */
3516                                 m_copydata(control, cmsg_data_off, (int)cpsize, (caddr_t)data);
3517                                 return (1);
3518                         } else {
3519                                 struct sctp_sndrcvinfo *sndrcvinfo;
3520
3521                                 sndrcvinfo = (struct sctp_sndrcvinfo *)data;
3522                                 if (found == 0) {
3523                                         if (cpsize < sizeof(struct sctp_sndrcvinfo)) {
3524                                                 return (found);
3525                                         }
3526                                         memset(sndrcvinfo, 0, sizeof(struct sctp_sndrcvinfo));
3527                                 }
3528                                 switch (cmh.cmsg_type) {
3529                                 case SCTP_SNDINFO:
3530                                         if (cmsg_data_len < (int)sizeof(struct sctp_sndinfo)) {
3531                                                 return (found);
3532                                         }
3533                                         m_copydata(control, cmsg_data_off, sizeof(struct sctp_sndinfo), (caddr_t)&sndinfo);
3534                                         sndrcvinfo->sinfo_stream = sndinfo.snd_sid;
3535                                         sndrcvinfo->sinfo_flags = sndinfo.snd_flags;
3536                                         sndrcvinfo->sinfo_ppid = sndinfo.snd_ppid;
3537                                         sndrcvinfo->sinfo_context = sndinfo.snd_context;
3538                                         sndrcvinfo->sinfo_assoc_id = sndinfo.snd_assoc_id;
3539                                         break;
3540                                 case SCTP_PRINFO:
3541                                         if (cmsg_data_len < (int)sizeof(struct sctp_prinfo)) {
3542                                                 return (found);
3543                                         }
3544                                         m_copydata(control, cmsg_data_off, sizeof(struct sctp_prinfo), (caddr_t)&prinfo);
3545                                         if (prinfo.pr_policy != SCTP_PR_SCTP_NONE) {
3546                                                 sndrcvinfo->sinfo_timetolive = prinfo.pr_value;
3547                                         } else {
3548                                                 sndrcvinfo->sinfo_timetolive = 0;
3549                                         }
3550                                         sndrcvinfo->sinfo_flags |= prinfo.pr_policy;
3551                                         break;
3552                                 case SCTP_AUTHINFO:
3553                                         if (cmsg_data_len < (int)sizeof(struct sctp_authinfo)) {
3554                                                 return (found);
3555                                         }
3556                                         m_copydata(control, cmsg_data_off, sizeof(struct sctp_authinfo), (caddr_t)&authinfo);
3557                                         sndrcvinfo->sinfo_keynumber_valid = 1;
3558                                         sndrcvinfo->sinfo_keynumber = authinfo.auth_keynumber;
3559                                         break;
3560                                 default:
3561                                         return (found);
3562                                 }
3563                                 found = 1;
3564                         }
3565                 }
3566         }
3567         return (found);
3568 }
3569
3570 static int
3571 sctp_process_cmsgs_for_init(struct sctp_tcb *stcb, struct mbuf *control, int *error)
3572 {
3573         struct cmsghdr cmh;
3574         int tlen, at;
3575         struct sctp_initmsg initmsg;
3576 #ifdef INET
3577         struct sockaddr_in sin;
3578 #endif
3579 #ifdef INET6
3580         struct sockaddr_in6 sin6;
3581 #endif
3582
3583         tlen = SCTP_BUF_LEN(control);
3584         at = 0;
3585         while (at < tlen) {
3586                 if ((tlen - at) < (int)CMSG_ALIGN(sizeof(cmh))) {
3587                         /* There is not enough room for one more. */
3588                         *error = EINVAL;
3589                         return (1);
3590                 }
3591                 m_copydata(control, at, sizeof(cmh), (caddr_t)&cmh);
3592                 if (cmh.cmsg_len < CMSG_ALIGN(sizeof(cmh))) {
3593                         /* We dont't have a complete CMSG header. */
3594                         *error = EINVAL;
3595                         return (1);
3596                 }
3597                 if (((int)cmh.cmsg_len + at) > tlen) {
3598                         /* We don't have the complete CMSG. */
3599                         *error = EINVAL;
3600                         return (1);
3601                 }
3602                 if (cmh.cmsg_level == IPPROTO_SCTP) {
3603                         switch (cmh.cmsg_type) {
3604                         case SCTP_INIT:
3605                                 if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh))) < sizeof(struct sctp_initmsg)) {
3606                                         *error = EINVAL;
3607                                         return (1);
3608                                 }
3609                                 m_copydata(control, at + CMSG_ALIGN(sizeof(cmh)), sizeof(struct sctp_initmsg), (caddr_t)&initmsg);
3610                                 if (initmsg.sinit_max_attempts)
3611                                         stcb->asoc.max_init_times = initmsg.sinit_max_attempts;
3612                                 if (initmsg.sinit_num_ostreams)
3613                                         stcb->asoc.pre_open_streams = initmsg.sinit_num_ostreams;
3614                                 if (initmsg.sinit_max_instreams)
3615                                         stcb->asoc.max_inbound_streams = initmsg.sinit_max_instreams;
3616                                 if (initmsg.sinit_max_init_timeo)
3617                                         stcb->asoc.initial_init_rto_max = initmsg.sinit_max_init_timeo;
3618                                 if (stcb->asoc.streamoutcnt < stcb->asoc.pre_open_streams) {
3619                                         struct sctp_stream_out *tmp_str;
3620                                         unsigned int i;
3621 #if defined(SCTP_DETAILED_STR_STATS)
3622                                         int j;
3623 #endif
3624
3625                                         /* Default is NOT correct */
3626                                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Ok, default:%d pre_open:%d\n",
3627                                             stcb->asoc.streamoutcnt, stcb->asoc.pre_open_streams);
3628                                         SCTP_TCB_UNLOCK(stcb);
3629                                         SCTP_MALLOC(tmp_str,
3630                                             struct sctp_stream_out *,
3631                                             (stcb->asoc.pre_open_streams * sizeof(struct sctp_stream_out)),
3632                                             SCTP_M_STRMO);
3633                                         SCTP_TCB_LOCK(stcb);
3634                                         if (tmp_str != NULL) {
3635                                                 SCTP_FREE(stcb->asoc.strmout, SCTP_M_STRMO);
3636                                                 stcb->asoc.strmout = tmp_str;
3637                                                 stcb->asoc.strm_realoutsize = stcb->asoc.streamoutcnt = stcb->asoc.pre_open_streams;
3638                                         } else {
3639                                                 stcb->asoc.pre_open_streams = stcb->asoc.streamoutcnt;
3640                                         }
3641                                         for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
3642                                                 TAILQ_INIT(&stcb->asoc.strmout[i].outqueue);
3643                                                 stcb->asoc.strmout[i].chunks_on_queues = 0;
3644                                                 stcb->asoc.strmout[i].next_mid_ordered = 0;
3645                                                 stcb->asoc.strmout[i].next_mid_unordered = 0;
3646 #if defined(SCTP_DETAILED_STR_STATS)
3647                                                 for (j = 0; j < SCTP_PR_SCTP_MAX + 1; j++) {
3648                                                         stcb->asoc.strmout[i].abandoned_sent[j] = 0;
3649                                                         stcb->asoc.strmout[i].abandoned_unsent[j] = 0;
3650                                                 }
3651 #else
3652                                                 stcb->asoc.strmout[i].abandoned_sent[0] = 0;
3653                                                 stcb->asoc.strmout[i].abandoned_unsent[0] = 0;
3654 #endif
3655                                                 stcb->asoc.strmout[i].sid = i;
3656                                                 stcb->asoc.strmout[i].last_msg_incomplete = 0;
3657                                                 stcb->asoc.strmout[i].state = SCTP_STREAM_OPENING;
3658                                                 stcb->asoc.ss_functions.sctp_ss_init_stream(stcb, &stcb->asoc.strmout[i], NULL);
3659                                         }
3660                                 }
3661                                 break;
3662 #ifdef INET
3663                         case SCTP_DSTADDRV4:
3664                                 if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh))) < sizeof(struct in_addr)) {
3665                                         *error = EINVAL;
3666                                         return (1);
3667                                 }
3668                                 memset(&sin, 0, sizeof(struct sockaddr_in));
3669                                 sin.sin_family = AF_INET;
3670                                 sin.sin_len = sizeof(struct sockaddr_in);
3671                                 sin.sin_port = stcb->rport;
3672                                 m_copydata(control, at + CMSG_ALIGN(sizeof(cmh)), sizeof(struct in_addr), (caddr_t)&sin.sin_addr);
3673                                 if ((sin.sin_addr.s_addr == INADDR_ANY) ||
3674                                     (sin.sin_addr.s_addr == INADDR_BROADCAST) ||
3675                                     IN_MULTICAST(ntohl(sin.sin_addr.s_addr))) {
3676                                         *error = EINVAL;
3677                                         return (1);
3678                                 }
3679                                 if (sctp_add_remote_addr(stcb, (struct sockaddr *)&sin, NULL, stcb->asoc.port,
3680                                     SCTP_DONOT_SETSCOPE, SCTP_ADDR_IS_CONFIRMED)) {
3681                                         *error = ENOBUFS;
3682                                         return (1);
3683                                 }
3684                                 break;
3685 #endif
3686 #ifdef INET6
3687                         case SCTP_DSTADDRV6:
3688                                 if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh))) < sizeof(struct in6_addr)) {
3689                                         *error = EINVAL;
3690                                         return (1);
3691                                 }
3692                                 memset(&sin6, 0, sizeof(struct sockaddr_in6));
3693                                 sin6.sin6_family = AF_INET6;
3694                                 sin6.sin6_len = sizeof(struct sockaddr_in6);
3695                                 sin6.sin6_port = stcb->rport;
3696                                 m_copydata(control, at + CMSG_ALIGN(sizeof(cmh)), sizeof(struct in6_addr), (caddr_t)&sin6.sin6_addr);
3697                                 if (IN6_IS_ADDR_UNSPECIFIED(&sin6.sin6_addr) ||
3698                                     IN6_IS_ADDR_MULTICAST(&sin6.sin6_addr)) {
3699                                         *error = EINVAL;
3700                                         return (1);
3701                                 }
3702 #ifdef INET
3703                                 if (IN6_IS_ADDR_V4MAPPED(&sin6.sin6_addr)) {
3704                                         in6_sin6_2_sin(&sin, &sin6);
3705                                         if ((sin.sin_addr.s_addr == INADDR_ANY) ||
3706                                             (sin.sin_addr.s_addr == INADDR_BROADCAST) ||
3707                                             IN_MULTICAST(ntohl(sin.sin_addr.s_addr))) {
3708                                                 *error = EINVAL;
3709                                                 return (1);
3710                                         }
3711                                         if (sctp_add_remote_addr(stcb, (struct sockaddr *)&sin, NULL, stcb->asoc.port,
3712                                             SCTP_DONOT_SETSCOPE, SCTP_ADDR_IS_CONFIRMED)) {
3713                                                 *error = ENOBUFS;
3714                                                 return (1);
3715                                         }
3716                                 } else
3717 #endif
3718                                         if (sctp_add_remote_addr(stcb, (struct sockaddr *)&sin6, NULL, stcb->asoc.port,
3719                                     SCTP_DONOT_SETSCOPE, SCTP_ADDR_IS_CONFIRMED)) {
3720                                         *error = ENOBUFS;
3721                                         return (1);
3722                                 }
3723                                 break;
3724 #endif
3725                         default:
3726                                 break;
3727                         }
3728                 }
3729                 at += CMSG_ALIGN(cmh.cmsg_len);
3730         }
3731         return (0);
3732 }
3733
3734 static struct sctp_tcb *
3735 sctp_findassociation_cmsgs(struct sctp_inpcb **inp_p,
3736     uint16_t port,
3737     struct mbuf *control,
3738     struct sctp_nets **net_p,
3739     int *error)
3740 {
3741         struct cmsghdr cmh;
3742         int tlen, at;
3743         struct sctp_tcb *stcb;
3744         struct sockaddr *addr;
3745 #ifdef INET
3746         struct sockaddr_in sin;
3747 #endif
3748 #ifdef INET6
3749         struct sockaddr_in6 sin6;
3750 #endif
3751
3752         tlen = SCTP_BUF_LEN(control);
3753         at = 0;
3754         while (at < tlen) {
3755                 if ((tlen - at) < (int)CMSG_ALIGN(sizeof(cmh))) {
3756                         /* There is not enough room for one more. */
3757                         *error = EINVAL;
3758                         return (NULL);
3759                 }
3760                 m_copydata(control, at, sizeof(cmh), (caddr_t)&cmh);
3761                 if (cmh.cmsg_len < CMSG_ALIGN(sizeof(cmh))) {
3762                         /* We dont't have a complete CMSG header. */
3763                         *error = EINVAL;
3764                         return (NULL);
3765                 }
3766                 if (((int)cmh.cmsg_len + at) > tlen) {
3767                         /* We don't have the complete CMSG. */
3768                         *error = EINVAL;
3769                         return (NULL);
3770                 }
3771                 if (cmh.cmsg_level == IPPROTO_SCTP) {
3772                         switch (cmh.cmsg_type) {
3773 #ifdef INET
3774                         case SCTP_DSTADDRV4:
3775                                 if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh))) < sizeof(struct in_addr)) {
3776                                         *error = EINVAL;
3777                                         return (NULL);
3778                                 }
3779                                 memset(&sin, 0, sizeof(struct sockaddr_in));
3780                                 sin.sin_family = AF_INET;
3781                                 sin.sin_len = sizeof(struct sockaddr_in);
3782                                 sin.sin_port = port;
3783                                 m_copydata(control, at + CMSG_ALIGN(sizeof(cmh)), sizeof(struct in_addr), (caddr_t)&sin.sin_addr);
3784                                 addr = (struct sockaddr *)&sin;
3785                                 break;
3786 #endif
3787 #ifdef INET6
3788                         case SCTP_DSTADDRV6:
3789                                 if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh))) < sizeof(struct in6_addr)) {
3790                                         *error = EINVAL;
3791                                         return (NULL);
3792                                 }
3793                                 memset(&sin6, 0, sizeof(struct sockaddr_in6));
3794                                 sin6.sin6_family = AF_INET6;
3795                                 sin6.sin6_len = sizeof(struct sockaddr_in6);
3796                                 sin6.sin6_port = port;
3797                                 m_copydata(control, at + CMSG_ALIGN(sizeof(cmh)), sizeof(struct in6_addr), (caddr_t)&sin6.sin6_addr);
3798 #ifdef INET
3799                                 if (IN6_IS_ADDR_V4MAPPED(&sin6.sin6_addr)) {
3800                                         in6_sin6_2_sin(&sin, &sin6);
3801                                         addr = (struct sockaddr *)&sin;
3802                                 } else
3803 #endif
3804                                         addr = (struct sockaddr *)&sin6;
3805                                 break;
3806 #endif
3807                         default:
3808                                 addr = NULL;
3809                                 break;
3810                         }
3811                         if (addr) {
3812                                 stcb = sctp_findassociation_ep_addr(inp_p, addr, net_p, NULL, NULL);
3813                                 if (stcb != NULL) {
3814                                         return (stcb);
3815                                 }
3816                         }
3817                 }
3818                 at += CMSG_ALIGN(cmh.cmsg_len);
3819         }
3820         return (NULL);
3821 }
3822
3823 static struct mbuf *
3824 sctp_add_cookie(struct mbuf *init, int init_offset,
3825     struct mbuf *initack, int initack_offset, struct sctp_state_cookie *stc_in, uint8_t * *signature)
3826 {
3827         struct mbuf *copy_init, *copy_initack, *m_at, *sig, *mret;
3828         struct sctp_state_cookie *stc;
3829         struct sctp_paramhdr *ph;
3830         uint8_t *foo;
3831         int sig_offset;
3832         uint16_t cookie_sz;
3833
3834         mret = sctp_get_mbuf_for_msg((sizeof(struct sctp_state_cookie) +
3835             sizeof(struct sctp_paramhdr)), 0,
3836             M_NOWAIT, 1, MT_DATA);
3837         if (mret == NULL) {
3838                 return (NULL);
3839         }
3840         copy_init = SCTP_M_COPYM(init, init_offset, M_COPYALL, M_NOWAIT);
3841         if (copy_init == NULL) {
3842                 sctp_m_freem(mret);
3843                 return (NULL);
3844         }
3845 #ifdef SCTP_MBUF_LOGGING
3846         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
3847                 sctp_log_mbc(copy_init, SCTP_MBUF_ICOPY);
3848         }
3849 #endif
3850         copy_initack = SCTP_M_COPYM(initack, initack_offset, M_COPYALL,
3851             M_NOWAIT);
3852         if (copy_initack == NULL) {
3853                 sctp_m_freem(mret);
3854                 sctp_m_freem(copy_init);
3855                 return (NULL);
3856         }
3857 #ifdef SCTP_MBUF_LOGGING
3858         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
3859                 sctp_log_mbc(copy_initack, SCTP_MBUF_ICOPY);
3860         }
3861 #endif
3862         /* easy side we just drop it on the end */
3863         ph = mtod(mret, struct sctp_paramhdr *);
3864         SCTP_BUF_LEN(mret) = sizeof(struct sctp_state_cookie) +
3865             sizeof(struct sctp_paramhdr);
3866         stc = (struct sctp_state_cookie *)((caddr_t)ph +
3867             sizeof(struct sctp_paramhdr));
3868         ph->param_type = htons(SCTP_STATE_COOKIE);
3869         ph->param_length = 0;   /* fill in at the end */
3870         /* Fill in the stc cookie data */
3871         memcpy(stc, stc_in, sizeof(struct sctp_state_cookie));
3872
3873         /* tack the INIT and then the INIT-ACK onto the chain */
3874         cookie_sz = 0;
3875         for (m_at = mret; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
3876                 cookie_sz += SCTP_BUF_LEN(m_at);
3877                 if (SCTP_BUF_NEXT(m_at) == NULL) {
3878                         SCTP_BUF_NEXT(m_at) = copy_init;
3879                         break;
3880                 }
3881         }
3882         for (m_at = copy_init; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
3883                 cookie_sz += SCTP_BUF_LEN(m_at);
3884                 if (SCTP_BUF_NEXT(m_at) == NULL) {
3885                         SCTP_BUF_NEXT(m_at) = copy_initack;
3886                         break;
3887                 }
3888         }
3889         for (m_at = copy_initack; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
3890                 cookie_sz += SCTP_BUF_LEN(m_at);
3891                 if (SCTP_BUF_NEXT(m_at) == NULL) {
3892                         break;
3893                 }
3894         }
3895         sig = sctp_get_mbuf_for_msg(SCTP_SECRET_SIZE, 0, M_NOWAIT, 1, MT_DATA);
3896         if (sig == NULL) {
3897                 /* no space, so free the entire chain */
3898                 sctp_m_freem(mret);
3899                 return (NULL);
3900         }
3901         SCTP_BUF_LEN(sig) = 0;
3902         SCTP_BUF_NEXT(m_at) = sig;
3903         sig_offset = 0;
3904         foo = (uint8_t *) (mtod(sig, caddr_t)+sig_offset);
3905         memset(foo, 0, SCTP_SIGNATURE_SIZE);
3906         *signature = foo;
3907         SCTP_BUF_LEN(sig) += SCTP_SIGNATURE_SIZE;
3908         cookie_sz += SCTP_SIGNATURE_SIZE;
3909         ph->param_length = htons(cookie_sz);
3910         return (mret);
3911 }
3912
3913
3914 static uint8_t
3915 sctp_get_ect(struct sctp_tcb *stcb){
3916         if ((stcb != NULL) && (stcb->asoc.ecn_supported == 1)) {
3917                 return (SCTP_ECT0_BIT);
3918         } else {
3919                 return (0);
3920         }
3921 }
3922
3923 #if defined(INET) || defined(INET6)
3924 static void
3925 sctp_handle_no_route(struct sctp_tcb *stcb,
3926     struct sctp_nets *net,
3927     int so_locked)
3928 {
3929         SCTPDBG(SCTP_DEBUG_OUTPUT1, "dropped packet - no valid source addr\n");
3930
3931         if (net) {
3932                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Destination was ");
3933                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT1, &net->ro._l_addr.sa);
3934                 if (net->dest_state & SCTP_ADDR_CONFIRMED) {
3935                         if ((net->dest_state & SCTP_ADDR_REACHABLE) && stcb) {
3936                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "no route takes interface %p down\n", (void *)net);
3937                                 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_DOWN,
3938                                     stcb, 0,
3939                                     (void *)net,
3940                                     so_locked);
3941                                 net->dest_state &= ~SCTP_ADDR_REACHABLE;
3942                                 net->dest_state &= ~SCTP_ADDR_PF;
3943                         }
3944                 }
3945                 if (stcb) {
3946                         if (net == stcb->asoc.primary_destination) {
3947                                 /* need a new primary */
3948                                 struct sctp_nets *alt;
3949
3950                                 alt = sctp_find_alternate_net(stcb, net, 0);
3951                                 if (alt != net) {
3952                                         if (stcb->asoc.alternate) {
3953                                                 sctp_free_remote_addr(stcb->asoc.alternate);
3954                                         }
3955                                         stcb->asoc.alternate = alt;
3956                                         atomic_add_int(&stcb->asoc.alternate->ref_count, 1);
3957                                         if (net->ro._s_addr) {
3958                                                 sctp_free_ifa(net->ro._s_addr);
3959                                                 net->ro._s_addr = NULL;
3960                                         }
3961                                         net->src_addr_selected = 0;
3962                                 }
3963                         }
3964                 }
3965         }
3966 }
3967 #endif
3968
3969 static int
3970 sctp_lowlevel_chunk_output(struct sctp_inpcb *inp,
3971     struct sctp_tcb *stcb,      /* may be NULL */
3972     struct sctp_nets *net,
3973     struct sockaddr *to,
3974     struct mbuf *m,
3975     uint32_t auth_offset,
3976     struct sctp_auth_chunk *auth,
3977     uint16_t auth_keyid,
3978     int nofragment_flag,
3979     int ecn_ok,
3980     int out_of_asoc_ok,
3981     uint16_t src_port,
3982     uint16_t dest_port,
3983     uint32_t v_tag,
3984     uint16_t port,
3985     union sctp_sockstore *over_addr,
3986     uint8_t mflowtype, uint32_t mflowid,
3987 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
3988     int so_locked SCTP_UNUSED
3989 #else
3990     int so_locked
3991 #endif
3992 )
3993 {
3994 /* nofragment_flag to tell if IP_DF should be set (IPv4 only) */
3995         /**
3996          * Given a mbuf chain (via SCTP_BUF_NEXT()) that holds a packet header
3997          * WITH an SCTPHDR but no IP header, endpoint inp and sa structure:
3998          * - fill in the HMAC digest of any AUTH chunk in the packet.
3999          * - calculate and fill in the SCTP checksum.
4000          * - prepend an IP address header.
4001          * - if boundall use INADDR_ANY.
4002          * - if boundspecific do source address selection.
4003          * - set fragmentation option for ipV4.
4004          * - On return from IP output, check/adjust mtu size of output
4005          *   interface and smallest_mtu size as well.
4006          */
4007         /* Will need ifdefs around this */
4008         struct mbuf *newm;
4009         struct sctphdr *sctphdr;
4010         int packet_length;
4011         int ret;
4012 #if defined(INET) || defined(INET6)
4013         uint32_t vrf_id;
4014 #endif
4015 #if defined(INET) || defined(INET6)
4016         struct mbuf *o_pak;
4017         sctp_route_t *ro = NULL;
4018         struct udphdr *udp = NULL;
4019 #endif
4020         uint8_t tos_value;
4021 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4022         struct socket *so = NULL;
4023 #endif
4024
4025         if ((net) && (net->dest_state & SCTP_ADDR_OUT_OF_SCOPE)) {
4026                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EFAULT);
4027                 sctp_m_freem(m);
4028                 return (EFAULT);
4029         }
4030 #if defined(INET) || defined(INET6)
4031         if (stcb) {
4032                 vrf_id = stcb->asoc.vrf_id;
4033         } else {
4034                 vrf_id = inp->def_vrf_id;
4035         }
4036 #endif
4037         /* fill in the HMAC digest for any AUTH chunk in the packet */
4038         if ((auth != NULL) && (stcb != NULL)) {
4039                 sctp_fill_hmac_digest_m(m, auth_offset, auth, stcb, auth_keyid);
4040         }
4041
4042         if (net) {
4043                 tos_value = net->dscp;
4044         } else if (stcb) {
4045                 tos_value = stcb->asoc.default_dscp;
4046         } else {
4047                 tos_value = inp->sctp_ep.default_dscp;
4048         }
4049
4050         switch (to->sa_family) {
4051 #ifdef INET
4052         case AF_INET:
4053                 {
4054                         struct ip *ip = NULL;
4055                         sctp_route_t iproute;
4056                         int len;
4057
4058                         len = SCTP_MIN_V4_OVERHEAD;
4059                         if (port) {
4060                                 len += sizeof(struct udphdr);
4061                         }
4062                         newm = sctp_get_mbuf_for_msg(len, 1, M_NOWAIT, 1, MT_DATA);
4063                         if (newm == NULL) {
4064                                 sctp_m_freem(m);
4065                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
4066                                 return (ENOMEM);
4067                         }
4068                         SCTP_ALIGN_TO_END(newm, len);
4069                         SCTP_BUF_LEN(newm) = len;
4070                         SCTP_BUF_NEXT(newm) = m;
4071                         m = newm;
4072                         if (net != NULL) {
4073                                 m->m_pkthdr.flowid = net->flowid;
4074                                 M_HASHTYPE_SET(m, net->flowtype);
4075                         } else {
4076                                 m->m_pkthdr.flowid = mflowid;
4077                                 M_HASHTYPE_SET(m, mflowtype);
4078                         }
4079                         packet_length = sctp_calculate_len(m);
4080                         ip = mtod(m, struct ip *);
4081                         ip->ip_v = IPVERSION;
4082                         ip->ip_hl = (sizeof(struct ip) >> 2);
4083                         if (tos_value == 0) {
4084                                 /*
4085                                  * This means especially, that it is not set
4086                                  * at the SCTP layer. So use the value from
4087                                  * the IP layer.
4088                                  */
4089                                 tos_value = inp->ip_inp.inp.inp_ip_tos;
4090                         }
4091                         tos_value &= 0xfc;
4092                         if (ecn_ok) {
4093                                 tos_value |= sctp_get_ect(stcb);
4094                         }
4095                         if ((nofragment_flag) && (port == 0)) {
4096                                 ip->ip_off = htons(IP_DF);
4097                         } else {
4098                                 ip->ip_off = htons(0);
4099                         }
4100                         /* FreeBSD has a function for ip_id's */
4101                         ip_fillid(ip);
4102
4103                         ip->ip_ttl = inp->ip_inp.inp.inp_ip_ttl;
4104                         ip->ip_len = htons(packet_length);
4105                         ip->ip_tos = tos_value;
4106                         if (port) {
4107                                 ip->ip_p = IPPROTO_UDP;
4108                         } else {
4109                                 ip->ip_p = IPPROTO_SCTP;
4110                         }
4111                         ip->ip_sum = 0;
4112                         if (net == NULL) {
4113                                 ro = &iproute;
4114                                 memset(&iproute, 0, sizeof(iproute));
4115                                 memcpy(&ro->ro_dst, to, to->sa_len);
4116                         } else {
4117                                 ro = (sctp_route_t *) & net->ro;
4118                         }
4119                         /* Now the address selection part */
4120                         ip->ip_dst.s_addr = ((struct sockaddr_in *)to)->sin_addr.s_addr;
4121
4122                         /* call the routine to select the src address */
4123                         if (net && out_of_asoc_ok == 0) {
4124                                 if (net->ro._s_addr && (net->ro._s_addr->localifa_flags & (SCTP_BEING_DELETED | SCTP_ADDR_IFA_UNUSEABLE))) {
4125                                         sctp_free_ifa(net->ro._s_addr);
4126                                         net->ro._s_addr = NULL;
4127                                         net->src_addr_selected = 0;
4128                                         if (ro->ro_rt) {
4129                                                 RTFREE(ro->ro_rt);
4130                                                 ro->ro_rt = NULL;
4131                                         }
4132                                 }
4133                                 if (net->src_addr_selected == 0) {
4134                                         /* Cache the source address */
4135                                         net->ro._s_addr = sctp_source_address_selection(inp, stcb,
4136                                             ro, net, 0,
4137                                             vrf_id);
4138                                         net->src_addr_selected = 1;
4139                                 }
4140                                 if (net->ro._s_addr == NULL) {
4141                                         /* No route to host */
4142                                         net->src_addr_selected = 0;
4143                                         sctp_handle_no_route(stcb, net, so_locked);
4144                                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4145                                         sctp_m_freem(m);
4146                                         return (EHOSTUNREACH);
4147                                 }
4148                                 ip->ip_src = net->ro._s_addr->address.sin.sin_addr;
4149                         } else {
4150                                 if (over_addr == NULL) {
4151                                         struct sctp_ifa *_lsrc;
4152
4153                                         _lsrc = sctp_source_address_selection(inp, stcb, ro,
4154                                             net,
4155                                             out_of_asoc_ok,
4156                                             vrf_id);
4157                                         if (_lsrc == NULL) {
4158                                                 sctp_handle_no_route(stcb, net, so_locked);
4159                                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4160                                                 sctp_m_freem(m);
4161                                                 return (EHOSTUNREACH);
4162                                         }
4163                                         ip->ip_src = _lsrc->address.sin.sin_addr;
4164                                         sctp_free_ifa(_lsrc);
4165                                 } else {
4166                                         ip->ip_src = over_addr->sin.sin_addr;
4167                                         SCTP_RTALLOC(ro, vrf_id, inp->fibnum);
4168                                 }
4169                         }
4170                         if (port) {
4171                                 if (htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port)) == 0) {
4172                                         sctp_handle_no_route(stcb, net, so_locked);
4173                                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4174                                         sctp_m_freem(m);
4175                                         return (EHOSTUNREACH);
4176                                 }
4177                                 udp = (struct udphdr *)((caddr_t)ip + sizeof(struct ip));
4178                                 udp->uh_sport = htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port));
4179                                 udp->uh_dport = port;
4180                                 udp->uh_ulen = htons((uint16_t) (packet_length - sizeof(struct ip)));
4181                                 if (V_udp_cksum) {
4182                                         udp->uh_sum = in_pseudo(ip->ip_src.s_addr, ip->ip_dst.s_addr, udp->uh_ulen + htons(IPPROTO_UDP));
4183                                 } else {
4184                                         udp->uh_sum = 0;
4185                                 }
4186                                 sctphdr = (struct sctphdr *)((caddr_t)udp + sizeof(struct udphdr));
4187                         } else {
4188                                 sctphdr = (struct sctphdr *)((caddr_t)ip + sizeof(struct ip));
4189                         }
4190
4191                         sctphdr->src_port = src_port;
4192                         sctphdr->dest_port = dest_port;
4193                         sctphdr->v_tag = v_tag;
4194                         sctphdr->checksum = 0;
4195
4196                         /*
4197                          * If source address selection fails and we find no
4198                          * route then the ip_output should fail as well with
4199                          * a NO_ROUTE_TO_HOST type error. We probably should
4200                          * catch that somewhere and abort the association
4201                          * right away (assuming this is an INIT being sent).
4202                          */
4203                         if (ro->ro_rt == NULL) {
4204                                 /*
4205                                  * src addr selection failed to find a route
4206                                  * (or valid source addr), so we can't get
4207                                  * there from here (yet)!
4208                                  */
4209                                 sctp_handle_no_route(stcb, net, so_locked);
4210                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4211                                 sctp_m_freem(m);
4212                                 return (EHOSTUNREACH);
4213                         }
4214                         if (ro != &iproute) {
4215                                 memcpy(&iproute, ro, sizeof(*ro));
4216                         }
4217                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "Calling ipv4 output routine from low level src addr:%x\n",
4218                             (uint32_t) (ntohl(ip->ip_src.s_addr)));
4219                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "Destination is %x\n",
4220                             (uint32_t) (ntohl(ip->ip_dst.s_addr)));
4221                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "RTP route is %p through\n",
4222                             (void *)ro->ro_rt);
4223
4224                         if (SCTP_GET_HEADER_FOR_OUTPUT(o_pak)) {
4225                                 /* failed to prepend data, give up */
4226                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
4227                                 sctp_m_freem(m);
4228                                 return (ENOMEM);
4229                         }
4230                         SCTP_ATTACH_CHAIN(o_pak, m, packet_length);
4231                         if (port) {
4232                                 sctphdr->checksum = sctp_calculate_cksum(m, sizeof(struct ip) + sizeof(struct udphdr));
4233                                 SCTP_STAT_INCR(sctps_sendswcrc);
4234                                 if (V_udp_cksum) {
4235                                         SCTP_ENABLE_UDP_CSUM(o_pak);
4236                                 }
4237                         } else {
4238                                 m->m_pkthdr.csum_flags = CSUM_SCTP;
4239                                 m->m_pkthdr.csum_data = offsetof(struct sctphdr, checksum);
4240                                 SCTP_STAT_INCR(sctps_sendhwcrc);
4241                         }
4242 #ifdef SCTP_PACKET_LOGGING
4243                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING)
4244                                 sctp_packet_log(o_pak);
4245 #endif
4246                         /* send it out.  table id is taken from stcb */
4247 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4248                         if ((SCTP_BASE_SYSCTL(sctp_output_unlocked)) && (so_locked)) {
4249                                 so = SCTP_INP_SO(inp);
4250                                 SCTP_SOCKET_UNLOCK(so, 0);
4251                         }
4252 #endif
4253                         SCTP_IP_OUTPUT(ret, o_pak, ro, stcb, vrf_id);
4254 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4255                         if ((SCTP_BASE_SYSCTL(sctp_output_unlocked)) && (so_locked)) {
4256                                 atomic_add_int(&stcb->asoc.refcnt, 1);
4257                                 SCTP_TCB_UNLOCK(stcb);
4258                                 SCTP_SOCKET_LOCK(so, 0);
4259                                 SCTP_TCB_LOCK(stcb);
4260                                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
4261                         }
4262 #endif
4263                         SCTP_STAT_INCR(sctps_sendpackets);
4264                         SCTP_STAT_INCR_COUNTER64(sctps_outpackets);
4265                         if (ret)
4266                                 SCTP_STAT_INCR(sctps_senderrors);
4267
4268                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "IP output returns %d\n", ret);
4269                         if (net == NULL) {
4270                                 /* free tempy routes */
4271                                 RO_RTFREE(ro);
4272                         } else {
4273                                 if ((ro->ro_rt != NULL) && (net->ro._s_addr) &&
4274                                     ((net->dest_state & SCTP_ADDR_NO_PMTUD) == 0)) {
4275                                         uint32_t mtu;
4276
4277                                         mtu = SCTP_GATHER_MTU_FROM_ROUTE(net->ro._s_addr, &net->ro._l_addr.sa, ro->ro_rt);
4278                                         if (mtu > 0) {
4279                                                 if (net->port) {
4280                                                         mtu -= sizeof(struct udphdr);
4281                                                 }
4282                                                 if ((stcb != NULL) && (stcb->asoc.smallest_mtu > mtu)) {
4283                                                         sctp_mtu_size_reset(inp, &stcb->asoc, mtu);
4284                                                 }
4285                                                 net->mtu = mtu;
4286                                         }
4287                                 } else if (ro->ro_rt == NULL) {
4288                                         /* route was freed */
4289                                         if (net->ro._s_addr &&
4290                                             net->src_addr_selected) {
4291                                                 sctp_free_ifa(net->ro._s_addr);
4292                                                 net->ro._s_addr = NULL;
4293                                         }
4294                                         net->src_addr_selected = 0;
4295                                 }
4296                         }
4297                         return (ret);
4298                 }
4299 #endif
4300 #ifdef INET6
4301         case AF_INET6:
4302                 {
4303                         uint32_t flowlabel, flowinfo;
4304                         struct ip6_hdr *ip6h;
4305                         struct route_in6 ip6route;
4306                         struct ifnet *ifp;
4307                         struct sockaddr_in6 *sin6, tmp, *lsa6, lsa6_tmp;
4308                         int prev_scope = 0;
4309                         struct sockaddr_in6 lsa6_storage;
4310                         int error;
4311                         u_short prev_port = 0;
4312                         int len;
4313
4314                         if (net) {
4315                                 flowlabel = net->flowlabel;
4316                         } else if (stcb) {
4317                                 flowlabel = stcb->asoc.default_flowlabel;
4318                         } else {
4319                                 flowlabel = inp->sctp_ep.default_flowlabel;
4320                         }
4321                         if (flowlabel == 0) {
4322                                 /*
4323                                  * This means especially, that it is not set
4324                                  * at the SCTP layer. So use the value from
4325                                  * the IP layer.
4326                                  */
4327                                 flowlabel = ntohl(((struct in6pcb *)inp)->in6p_flowinfo);
4328                         }
4329                         flowlabel &= 0x000fffff;
4330                         len = SCTP_MIN_OVERHEAD;
4331                         if (port) {
4332                                 len += sizeof(struct udphdr);
4333                         }
4334                         newm = sctp_get_mbuf_for_msg(len, 1, M_NOWAIT, 1, MT_DATA);
4335                         if (newm == NULL) {
4336                                 sctp_m_freem(m);
4337                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
4338                                 return (ENOMEM);
4339                         }
4340                         SCTP_ALIGN_TO_END(newm, len);
4341                         SCTP_BUF_LEN(newm) = len;
4342                         SCTP_BUF_NEXT(newm) = m;
4343                         m = newm;
4344                         if (net != NULL) {
4345                                 m->m_pkthdr.flowid = net->flowid;
4346                                 M_HASHTYPE_SET(m, net->flowtype);
4347                         } else {
4348                                 m->m_pkthdr.flowid = mflowid;
4349                                 M_HASHTYPE_SET(m, mflowtype);
4350                         }
4351                         packet_length = sctp_calculate_len(m);
4352
4353                         ip6h = mtod(m, struct ip6_hdr *);
4354                         /* protect *sin6 from overwrite */
4355                         sin6 = (struct sockaddr_in6 *)to;
4356                         tmp = *sin6;
4357                         sin6 = &tmp;
4358
4359                         /* KAME hack: embed scopeid */
4360                         if (sa6_embedscope(sin6, MODULE_GLOBAL(ip6_use_defzone)) != 0) {
4361                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
4362                                 return (EINVAL);
4363                         }
4364                         if (net == NULL) {
4365                                 memset(&ip6route, 0, sizeof(ip6route));
4366                                 ro = (sctp_route_t *) & ip6route;
4367                                 memcpy(&ro->ro_dst, sin6, sin6->sin6_len);
4368                         } else {
4369                                 ro = (sctp_route_t *) & net->ro;
4370                         }
4371                         /*
4372                          * We assume here that inp_flow is in host byte
4373                          * order within the TCB!
4374                          */
4375                         if (tos_value == 0) {
4376                                 /*
4377                                  * This means especially, that it is not set
4378                                  * at the SCTP layer. So use the value from
4379                                  * the IP layer.
4380                                  */
4381                                 tos_value = (ntohl(((struct in6pcb *)inp)->in6p_flowinfo) >> 20) & 0xff;
4382                         }
4383                         tos_value &= 0xfc;
4384                         if (ecn_ok) {
4385                                 tos_value |= sctp_get_ect(stcb);
4386                         }
4387                         flowinfo = 0x06;
4388                         flowinfo <<= 8;
4389                         flowinfo |= tos_value;
4390                         flowinfo <<= 20;
4391                         flowinfo |= flowlabel;
4392                         ip6h->ip6_flow = htonl(flowinfo);
4393                         if (port) {
4394                                 ip6h->ip6_nxt = IPPROTO_UDP;
4395                         } else {
4396                                 ip6h->ip6_nxt = IPPROTO_SCTP;
4397                         }
4398                         ip6h->ip6_plen = htons(packet_length - sizeof(struct ip6_hdr));
4399                         ip6h->ip6_dst = sin6->sin6_addr;
4400
4401                         /*
4402                          * Add SRC address selection here: we can only reuse
4403                          * to a limited degree the kame src-addr-sel, since
4404                          * we can try their selection but it may not be
4405                          * bound.
4406                          */
4407                         memset(&lsa6_tmp, 0, sizeof(lsa6_tmp));
4408                         lsa6_tmp.sin6_family = AF_INET6;
4409                         lsa6_tmp.sin6_len = sizeof(lsa6_tmp);
4410                         lsa6 = &lsa6_tmp;
4411                         if (net && out_of_asoc_ok == 0) {
4412                                 if (net->ro._s_addr && (net->ro._s_addr->localifa_flags & (SCTP_BEING_DELETED | SCTP_ADDR_IFA_UNUSEABLE))) {
4413                                         sctp_free_ifa(net->ro._s_addr);
4414                                         net->ro._s_addr = NULL;
4415                                         net->src_addr_selected = 0;
4416                                         if (ro->ro_rt) {
4417                                                 RTFREE(ro->ro_rt);
4418                                                 ro->ro_rt = NULL;
4419                                         }
4420                                 }
4421                                 if (net->src_addr_selected == 0) {
4422                                         sin6 = (struct sockaddr_in6 *)&net->ro._l_addr;
4423                                         /* KAME hack: embed scopeid */
4424                                         if (sa6_embedscope(sin6, MODULE_GLOBAL(ip6_use_defzone)) != 0) {
4425                                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
4426                                                 return (EINVAL);
4427                                         }
4428                                         /* Cache the source address */
4429                                         net->ro._s_addr = sctp_source_address_selection(inp,
4430                                             stcb,
4431                                             ro,
4432                                             net,
4433                                             0,
4434                                             vrf_id);
4435                                         (void)sa6_recoverscope(sin6);
4436                                         net->src_addr_selected = 1;
4437                                 }
4438                                 if (net->ro._s_addr == NULL) {
4439                                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "V6:No route to host\n");
4440                                         net->src_addr_selected = 0;
4441                                         sctp_handle_no_route(stcb, net, so_locked);
4442                                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4443                                         sctp_m_freem(m);
4444                                         return (EHOSTUNREACH);
4445                                 }
4446                                 lsa6->sin6_addr = net->ro._s_addr->address.sin6.sin6_addr;
4447                         } else {
4448                                 sin6 = (struct sockaddr_in6 *)&ro->ro_dst;
4449                                 /* KAME hack: embed scopeid */
4450                                 if (sa6_embedscope(sin6, MODULE_GLOBAL(ip6_use_defzone)) != 0) {
4451                                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
4452                                         return (EINVAL);
4453                                 }
4454                                 if (over_addr == NULL) {
4455                                         struct sctp_ifa *_lsrc;
4456
4457                                         _lsrc = sctp_source_address_selection(inp, stcb, ro,
4458                                             net,
4459                                             out_of_asoc_ok,
4460                                             vrf_id);
4461                                         if (_lsrc == NULL) {
4462                                                 sctp_handle_no_route(stcb, net, so_locked);
4463                                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4464                                                 sctp_m_freem(m);
4465                                                 return (EHOSTUNREACH);
4466                                         }
4467                                         lsa6->sin6_addr = _lsrc->address.sin6.sin6_addr;
4468                                         sctp_free_ifa(_lsrc);
4469                                 } else {
4470                                         lsa6->sin6_addr = over_addr->sin6.sin6_addr;
4471                                         SCTP_RTALLOC(ro, vrf_id, inp->fibnum);
4472                                 }
4473                                 (void)sa6_recoverscope(sin6);
4474                         }
4475                         lsa6->sin6_port = inp->sctp_lport;
4476
4477                         if (ro->ro_rt == NULL) {
4478                                 /*
4479                                  * src addr selection failed to find a route
4480                                  * (or valid source addr), so we can't get
4481                                  * there from here!
4482                                  */
4483                                 sctp_handle_no_route(stcb, net, so_locked);
4484                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4485                                 sctp_m_freem(m);
4486                                 return (EHOSTUNREACH);
4487                         }
4488                         /*
4489                          * XXX: sa6 may not have a valid sin6_scope_id in
4490                          * the non-SCOPEDROUTING case.
4491                          */
4492                         memset(&lsa6_storage, 0, sizeof(lsa6_storage));
4493                         lsa6_storage.sin6_family = AF_INET6;
4494                         lsa6_storage.sin6_len = sizeof(lsa6_storage);
4495                         lsa6_storage.sin6_addr = lsa6->sin6_addr;
4496                         if ((error = sa6_recoverscope(&lsa6_storage)) != 0) {
4497                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "recover scope fails error %d\n", error);
4498                                 sctp_m_freem(m);
4499                                 return (error);
4500                         }
4501                         /* XXX */
4502                         lsa6_storage.sin6_addr = lsa6->sin6_addr;
4503                         lsa6_storage.sin6_port = inp->sctp_lport;
4504                         lsa6 = &lsa6_storage;
4505                         ip6h->ip6_src = lsa6->sin6_addr;
4506
4507                         if (port) {
4508                                 if (htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port)) == 0) {
4509                                         sctp_handle_no_route(stcb, net, so_locked);
4510                                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4511                                         sctp_m_freem(m);
4512                                         return (EHOSTUNREACH);
4513                                 }
4514                                 udp = (struct udphdr *)((caddr_t)ip6h + sizeof(struct ip6_hdr));
4515                                 udp->uh_sport = htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port));
4516                                 udp->uh_dport = port;
4517                                 udp->uh_ulen = htons((uint16_t) (packet_length - sizeof(struct ip6_hdr)));
4518                                 udp->uh_sum = 0;
4519                                 sctphdr = (struct sctphdr *)((caddr_t)udp + sizeof(struct udphdr));
4520                         } else {
4521                                 sctphdr = (struct sctphdr *)((caddr_t)ip6h + sizeof(struct ip6_hdr));
4522                         }
4523
4524                         sctphdr->src_port = src_port;
4525                         sctphdr->dest_port = dest_port;
4526                         sctphdr->v_tag = v_tag;
4527                         sctphdr->checksum = 0;
4528
4529                         /*
4530                          * We set the hop limit now since there is a good
4531                          * chance that our ro pointer is now filled
4532                          */
4533                         ip6h->ip6_hlim = SCTP_GET_HLIM(inp, ro);
4534                         ifp = SCTP_GET_IFN_VOID_FROM_ROUTE(ro);
4535
4536 #ifdef SCTP_DEBUG
4537                         /* Copy to be sure something bad is not happening */
4538                         sin6->sin6_addr = ip6h->ip6_dst;
4539                         lsa6->sin6_addr = ip6h->ip6_src;
4540 #endif
4541
4542                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "Calling ipv6 output routine from low level\n");
4543                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "src: ");
4544                         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT3, (struct sockaddr *)lsa6);
4545                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "dst: ");
4546                         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT3, (struct sockaddr *)sin6);
4547                         if (net) {
4548                                 sin6 = (struct sockaddr_in6 *)&net->ro._l_addr;
4549                                 /*
4550                                  * preserve the port and scope for link
4551                                  * local send
4552                                  */
4553                                 prev_scope = sin6->sin6_scope_id;
4554                                 prev_port = sin6->sin6_port;
4555                         }
4556
4557                         if (SCTP_GET_HEADER_FOR_OUTPUT(o_pak)) {
4558                                 /* failed to prepend data, give up */
4559                                 sctp_m_freem(m);
4560                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
4561                                 return (ENOMEM);
4562                         }
4563                         SCTP_ATTACH_CHAIN(o_pak, m, packet_length);
4564                         if (port) {
4565                                 sctphdr->checksum = sctp_calculate_cksum(m, sizeof(struct ip6_hdr) + sizeof(struct udphdr));
4566                                 SCTP_STAT_INCR(sctps_sendswcrc);
4567                                 if ((udp->uh_sum = in6_cksum(o_pak, IPPROTO_UDP, sizeof(struct ip6_hdr), packet_length - sizeof(struct ip6_hdr))) == 0) {
4568                                         udp->uh_sum = 0xffff;
4569                                 }
4570                         } else {
4571                                 m->m_pkthdr.csum_flags = CSUM_SCTP_IPV6;
4572                                 m->m_pkthdr.csum_data = offsetof(struct sctphdr, checksum);
4573                                 SCTP_STAT_INCR(sctps_sendhwcrc);
4574                         }
4575                         /* send it out. table id is taken from stcb */
4576 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4577                         if ((SCTP_BASE_SYSCTL(sctp_output_unlocked)) && (so_locked)) {
4578                                 so = SCTP_INP_SO(inp);
4579                                 SCTP_SOCKET_UNLOCK(so, 0);
4580                         }
4581 #endif
4582 #ifdef SCTP_PACKET_LOGGING
4583                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING)
4584                                 sctp_packet_log(o_pak);
4585 #endif
4586                         SCTP_IP6_OUTPUT(ret, o_pak, (struct route_in6 *)ro, &ifp, stcb, vrf_id);
4587 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4588                         if ((SCTP_BASE_SYSCTL(sctp_output_unlocked)) && (so_locked)) {
4589                                 atomic_add_int(&stcb->asoc.refcnt, 1);
4590                                 SCTP_TCB_UNLOCK(stcb);
4591                                 SCTP_SOCKET_LOCK(so, 0);
4592                                 SCTP_TCB_LOCK(stcb);
4593                                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
4594                         }
4595 #endif
4596                         if (net) {
4597                                 /* for link local this must be done */
4598                                 sin6->sin6_scope_id = prev_scope;
4599                                 sin6->sin6_port = prev_port;
4600                         }
4601                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "return from send is %d\n", ret);
4602                         SCTP_STAT_INCR(sctps_sendpackets);
4603                         SCTP_STAT_INCR_COUNTER64(sctps_outpackets);
4604                         if (ret) {
4605                                 SCTP_STAT_INCR(sctps_senderrors);
4606                         }
4607                         if (net == NULL) {
4608                                 /* Now if we had a temp route free it */
4609                                 RO_RTFREE(ro);
4610                         } else {
4611                                 /*
4612                                  * PMTU check versus smallest asoc MTU goes
4613                                  * here
4614                                  */
4615                                 if (ro->ro_rt == NULL) {
4616                                         /* Route was freed */
4617                                         if (net->ro._s_addr &&
4618                                             net->src_addr_selected) {
4619                                                 sctp_free_ifa(net->ro._s_addr);
4620                                                 net->ro._s_addr = NULL;
4621                                         }
4622                                         net->src_addr_selected = 0;
4623                                 }
4624                                 if ((ro->ro_rt != NULL) && (net->ro._s_addr) &&
4625                                     ((net->dest_state & SCTP_ADDR_NO_PMTUD) == 0)) {
4626                                         uint32_t mtu;
4627
4628                                         mtu = SCTP_GATHER_MTU_FROM_ROUTE(net->ro._s_addr, &net->ro._l_addr.sa, ro->ro_rt);
4629                                         if (mtu > 0) {
4630                                                 if (net->port) {
4631                                                         mtu -= sizeof(struct udphdr);
4632                                                 }
4633                                                 if ((stcb != NULL) && (stcb->asoc.smallest_mtu > mtu)) {
4634                                                         sctp_mtu_size_reset(inp, &stcb->asoc, mtu);
4635                                                 }
4636                                                 net->mtu = mtu;
4637                                         }
4638                                 } else if (ifp) {
4639                                         if (ND_IFINFO(ifp)->linkmtu &&
4640                                             (stcb->asoc.smallest_mtu > ND_IFINFO(ifp)->linkmtu)) {
4641                                                 sctp_mtu_size_reset(inp,
4642                                                     &stcb->asoc,
4643                                                     ND_IFINFO(ifp)->linkmtu);
4644                                         }
4645                                 }
4646                         }
4647                         return (ret);
4648                 }
4649 #endif
4650         default:
4651                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Unknown protocol (TSNH) type %d\n",
4652                     ((struct sockaddr *)to)->sa_family);
4653                 sctp_m_freem(m);
4654                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EFAULT);
4655                 return (EFAULT);
4656         }
4657 }
4658
4659
4660 void
4661 sctp_send_initiate(struct sctp_inpcb *inp, struct sctp_tcb *stcb, int so_locked
4662 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
4663     SCTP_UNUSED
4664 #endif
4665 )
4666 {
4667         struct mbuf *m, *m_last;
4668         struct sctp_nets *net;
4669         struct sctp_init_chunk *init;
4670         struct sctp_supported_addr_param *sup_addr;
4671         struct sctp_adaptation_layer_indication *ali;
4672         struct sctp_supported_chunk_types_param *pr_supported;
4673         struct sctp_paramhdr *ph;
4674         int cnt_inits_to = 0;
4675         int error;
4676         uint16_t num_ext, chunk_len, padding_len, parameter_len;
4677
4678         /* INIT's always go to the primary (and usually ONLY address) */
4679         net = stcb->asoc.primary_destination;
4680         if (net == NULL) {
4681                 net = TAILQ_FIRST(&stcb->asoc.nets);
4682                 if (net == NULL) {
4683                         /* TSNH */
4684                         return;
4685                 }
4686                 /* we confirm any address we send an INIT to */
4687                 net->dest_state &= ~SCTP_ADDR_UNCONFIRMED;
4688                 (void)sctp_set_primary_addr(stcb, NULL, net);
4689         } else {
4690                 /* we confirm any address we send an INIT to */
4691                 net->dest_state &= ~SCTP_ADDR_UNCONFIRMED;
4692         }
4693         SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT\n");
4694 #ifdef INET6
4695         if (net->ro._l_addr.sa.sa_family == AF_INET6) {
4696                 /*
4697                  * special hook, if we are sending to link local it will not
4698                  * show up in our private address count.
4699                  */
4700                 if (IN6_IS_ADDR_LINKLOCAL(&net->ro._l_addr.sin6.sin6_addr))
4701                         cnt_inits_to = 1;
4702         }
4703 #endif
4704         if (SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
4705                 /* This case should not happen */
4706                 SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT - failed timer?\n");
4707                 return;
4708         }
4709         /* start the INIT timer */
4710         sctp_timer_start(SCTP_TIMER_TYPE_INIT, inp, stcb, net);
4711
4712         m = sctp_get_mbuf_for_msg(MCLBYTES, 1, M_NOWAIT, 1, MT_DATA);
4713         if (m == NULL) {
4714                 /* No memory, INIT timer will re-attempt. */
4715                 SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT - mbuf?\n");
4716                 return;
4717         }
4718         chunk_len = (uint16_t) sizeof(struct sctp_init_chunk);
4719         padding_len = 0;
4720         /* Now lets put the chunk header in place */
4721         init = mtod(m, struct sctp_init_chunk *);
4722         /* now the chunk header */
4723         init->ch.chunk_type = SCTP_INITIATION;
4724         init->ch.chunk_flags = 0;
4725         /* fill in later from mbuf we build */
4726         init->ch.chunk_length = 0;
4727         /* place in my tag */
4728         init->init.initiate_tag = htonl(stcb->asoc.my_vtag);
4729         /* set up some of the credits. */
4730         init->init.a_rwnd = htonl(max(inp->sctp_socket ? SCTP_SB_LIMIT_RCV(inp->sctp_socket) : 0,
4731             SCTP_MINIMAL_RWND));
4732         init->init.num_outbound_streams = htons(stcb->asoc.pre_open_streams);
4733         init->init.num_inbound_streams = htons(stcb->asoc.max_inbound_streams);
4734         init->init.initial_tsn = htonl(stcb->asoc.init_seq_number);
4735
4736         /* Adaptation layer indication parameter */
4737         if (inp->sctp_ep.adaptation_layer_indicator_provided) {
4738                 parameter_len = (uint16_t) sizeof(struct sctp_adaptation_layer_indication);
4739                 ali = (struct sctp_adaptation_layer_indication *)(mtod(m, caddr_t)+chunk_len);
4740                 ali->ph.param_type = htons(SCTP_ULP_ADAPTATION);
4741                 ali->ph.param_length = htons(parameter_len);
4742                 ali->indication = htonl(inp->sctp_ep.adaptation_layer_indicator);
4743                 chunk_len += parameter_len;
4744         }
4745
4746         /* ECN parameter */
4747         if (stcb->asoc.ecn_supported == 1) {
4748                 parameter_len = (uint16_t) sizeof(struct sctp_paramhdr);
4749                 ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
4750                 ph->param_type = htons(SCTP_ECN_CAPABLE);
4751                 ph->param_length = htons(parameter_len);
4752                 chunk_len += parameter_len;
4753         }
4754
4755         /* PR-SCTP supported parameter */
4756         if (stcb->asoc.prsctp_supported == 1) {
4757                 parameter_len = (uint16_t) sizeof(struct sctp_paramhdr);
4758                 ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
4759                 ph->param_type = htons(SCTP_PRSCTP_SUPPORTED);
4760                 ph->param_length = htons(parameter_len);
4761                 chunk_len += parameter_len;
4762         }
4763
4764         /* Add NAT friendly parameter. */
4765         if (SCTP_BASE_SYSCTL(sctp_inits_include_nat_friendly)) {
4766                 parameter_len = (uint16_t) sizeof(struct sctp_paramhdr);
4767                 ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
4768                 ph->param_type = htons(SCTP_HAS_NAT_SUPPORT);
4769                 ph->param_length = htons(parameter_len);
4770                 chunk_len += parameter_len;
4771         }
4772
4773         /* And now tell the peer which extensions we support */
4774         num_ext = 0;
4775         pr_supported = (struct sctp_supported_chunk_types_param *)(mtod(m, caddr_t)+chunk_len);
4776         if (stcb->asoc.prsctp_supported == 1) {
4777                 pr_supported->chunk_types[num_ext++] = SCTP_FORWARD_CUM_TSN;
4778                 if (stcb->asoc.idata_supported) {
4779                         pr_supported->chunk_types[num_ext++] = SCTP_IFORWARD_CUM_TSN;
4780                 }
4781         }
4782         if (stcb->asoc.auth_supported == 1) {
4783                 pr_supported->chunk_types[num_ext++] = SCTP_AUTHENTICATION;
4784         }
4785         if (stcb->asoc.asconf_supported == 1) {
4786                 pr_supported->chunk_types[num_ext++] = SCTP_ASCONF;
4787                 pr_supported->chunk_types[num_ext++] = SCTP_ASCONF_ACK;
4788         }
4789         if (stcb->asoc.reconfig_supported == 1) {
4790                 pr_supported->chunk_types[num_ext++] = SCTP_STREAM_RESET;
4791         }
4792         if (stcb->asoc.idata_supported) {
4793                 pr_supported->chunk_types[num_ext++] = SCTP_IDATA;
4794         }
4795         if (stcb->asoc.nrsack_supported == 1) {
4796                 pr_supported->chunk_types[num_ext++] = SCTP_NR_SELECTIVE_ACK;
4797         }
4798         if (stcb->asoc.pktdrop_supported == 1) {
4799                 pr_supported->chunk_types[num_ext++] = SCTP_PACKET_DROPPED;
4800         }
4801         if (num_ext > 0) {
4802                 parameter_len = (uint16_t) sizeof(struct sctp_supported_chunk_types_param) + num_ext;
4803                 pr_supported->ph.param_type = htons(SCTP_SUPPORTED_CHUNK_EXT);
4804                 pr_supported->ph.param_length = htons(parameter_len);
4805                 padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
4806                 chunk_len += parameter_len;
4807         }
4808         /* add authentication parameters */
4809         if (stcb->asoc.auth_supported) {
4810                 /* attach RANDOM parameter, if available */
4811                 if (stcb->asoc.authinfo.random != NULL) {
4812                         struct sctp_auth_random *randp;
4813
4814                         if (padding_len > 0) {
4815                                 memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
4816                                 chunk_len += padding_len;
4817                                 padding_len = 0;
4818                         }
4819                         randp = (struct sctp_auth_random *)(mtod(m, caddr_t)+chunk_len);
4820                         parameter_len = (uint16_t) sizeof(struct sctp_auth_random) + stcb->asoc.authinfo.random_len;
4821                         /* random key already contains the header */
4822                         memcpy(randp, stcb->asoc.authinfo.random->key, parameter_len);
4823                         padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
4824                         chunk_len += parameter_len;
4825                 }
4826                 /* add HMAC_ALGO parameter */
4827                 if (stcb->asoc.local_hmacs != NULL) {
4828                         struct sctp_auth_hmac_algo *hmacs;
4829
4830                         if (padding_len > 0) {
4831                                 memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
4832                                 chunk_len += padding_len;
4833                                 padding_len = 0;
4834                         }
4835                         hmacs = (struct sctp_auth_hmac_algo *)(mtod(m, caddr_t)+chunk_len);
4836                         parameter_len = (uint16_t) (sizeof(struct sctp_auth_hmac_algo) +
4837                             stcb->asoc.local_hmacs->num_algo * sizeof(uint16_t));
4838                         hmacs->ph.param_type = htons(SCTP_HMAC_LIST);
4839                         hmacs->ph.param_length = htons(parameter_len);
4840                         sctp_serialize_hmaclist(stcb->asoc.local_hmacs, (uint8_t *) hmacs->hmac_ids);
4841                         padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
4842                         chunk_len += parameter_len;
4843                 }
4844                 /* add CHUNKS parameter */
4845                 if (stcb->asoc.local_auth_chunks != NULL) {
4846                         struct sctp_auth_chunk_list *chunks;
4847
4848                         if (padding_len > 0) {
4849                                 memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
4850                                 chunk_len += padding_len;
4851                                 padding_len = 0;
4852                         }
4853                         chunks = (struct sctp_auth_chunk_list *)(mtod(m, caddr_t)+chunk_len);
4854                         parameter_len = (uint16_t) (sizeof(struct sctp_auth_chunk_list) +
4855                             sctp_auth_get_chklist_size(stcb->asoc.local_auth_chunks));
4856                         chunks->ph.param_type = htons(SCTP_CHUNK_LIST);
4857                         chunks->ph.param_length = htons(parameter_len);
4858                         sctp_serialize_auth_chunks(stcb->asoc.local_auth_chunks, chunks->chunk_types);
4859                         padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
4860                         chunk_len += parameter_len;
4861                 }
4862         }
4863
4864         /* now any cookie time extensions */
4865         if (stcb->asoc.cookie_preserve_req) {
4866                 struct sctp_cookie_perserve_param *cookie_preserve;
4867
4868                 if (padding_len > 0) {
4869                         memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
4870                         chunk_len += padding_len;
4871                         padding_len = 0;
4872                 }
4873                 parameter_len = (uint16_t) sizeof(struct sctp_cookie_perserve_param);
4874                 cookie_preserve = (struct sctp_cookie_perserve_param *)(mtod(m, caddr_t)+chunk_len);
4875                 cookie_preserve->ph.param_type = htons(SCTP_COOKIE_PRESERVE);
4876                 cookie_preserve->ph.param_length = htons(parameter_len);
4877                 cookie_preserve->time = htonl(stcb->asoc.cookie_preserve_req);
4878                 stcb->asoc.cookie_preserve_req = 0;
4879                 chunk_len += parameter_len;
4880         }
4881
4882         if (stcb->asoc.scope.ipv4_addr_legal || stcb->asoc.scope.ipv6_addr_legal) {
4883                 uint8_t i;
4884
4885                 if (padding_len > 0) {
4886                         memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
4887                         chunk_len += padding_len;
4888                         padding_len = 0;
4889                 }
4890                 parameter_len = (uint16_t) sizeof(struct sctp_paramhdr);
4891                 if (stcb->asoc.scope.ipv4_addr_legal) {
4892                         parameter_len += (uint16_t) sizeof(uint16_t);
4893                 }
4894                 if (stcb->asoc.scope.ipv6_addr_legal) {
4895                         parameter_len += (uint16_t) sizeof(uint16_t);
4896                 }
4897                 sup_addr = (struct sctp_supported_addr_param *)(mtod(m, caddr_t)+chunk_len);
4898                 sup_addr->ph.param_type = htons(SCTP_SUPPORTED_ADDRTYPE);
4899                 sup_addr->ph.param_length = htons(parameter_len);
4900                 i = 0;
4901                 if (stcb->asoc.scope.ipv4_addr_legal) {
4902                         sup_addr->addr_type[i++] = htons(SCTP_IPV4_ADDRESS);
4903                 }
4904                 if (stcb->asoc.scope.ipv6_addr_legal) {
4905                         sup_addr->addr_type[i++] = htons(SCTP_IPV6_ADDRESS);
4906                 }
4907                 padding_len = 4 - 2 * i;
4908                 chunk_len += parameter_len;
4909         }
4910
4911         SCTP_BUF_LEN(m) = chunk_len;
4912         /* now the addresses */
4913         /*
4914          * To optimize this we could put the scoping stuff into a structure
4915          * and remove the individual uint8's from the assoc structure. Then
4916          * we could just sifa in the address within the stcb. But for now
4917          * this is a quick hack to get the address stuff teased apart.
4918          */
4919         m_last = sctp_add_addresses_to_i_ia(inp, stcb, &stcb->asoc.scope,
4920             m, cnt_inits_to,
4921             &padding_len, &chunk_len);
4922
4923         init->ch.chunk_length = htons(chunk_len);
4924         if (padding_len > 0) {
4925                 if (sctp_add_pad_tombuf(m_last, padding_len) == NULL) {
4926                         sctp_m_freem(m);
4927                         return;
4928                 }
4929         }
4930         SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT - calls lowlevel_output\n");
4931         if ((error = sctp_lowlevel_chunk_output(inp, stcb, net,
4932             (struct sockaddr *)&net->ro._l_addr,
4933             m, 0, NULL, 0, 0, 0, 0,
4934             inp->sctp_lport, stcb->rport, htonl(0),
4935             net->port, NULL,
4936             0, 0,
4937             so_locked))) {
4938                 SCTPDBG(SCTP_DEBUG_OUTPUT4, "Gak send error %d\n", error);
4939                 if (error == ENOBUFS) {
4940                         stcb->asoc.ifp_had_enobuf = 1;
4941                         SCTP_STAT_INCR(sctps_lowlevelerr);
4942                 }
4943         } else {
4944                 stcb->asoc.ifp_had_enobuf = 0;
4945         }
4946         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
4947         (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
4948 }
4949
4950 struct mbuf *
4951 sctp_arethere_unrecognized_parameters(struct mbuf *in_initpkt,
4952     int param_offset, int *abort_processing, struct sctp_chunkhdr *cp, int *nat_friendly)
4953 {
4954         /*
4955          * Given a mbuf containing an INIT or INIT-ACK with the param_offset
4956          * being equal to the beginning of the params i.e. (iphlen +
4957          * sizeof(struct sctp_init_msg) parse through the parameters to the
4958          * end of the mbuf verifying that all parameters are known.
4959          *
4960          * For unknown parameters build and return a mbuf with
4961          * UNRECOGNIZED_PARAMETER errors. If the flags indicate to stop
4962          * processing this chunk stop, and set *abort_processing to 1.
4963          *
4964          * By having param_offset be pre-set to where parameters begin it is
4965          * hoped that this routine may be reused in the future by new
4966          * features.
4967          */
4968         struct sctp_paramhdr *phdr, params;
4969
4970         struct mbuf *mat, *op_err;
4971         char tempbuf[SCTP_PARAM_BUFFER_SIZE];
4972         int at, limit, pad_needed;
4973         uint16_t ptype, plen, padded_size;
4974         int err_at;
4975
4976         *abort_processing = 0;
4977         mat = in_initpkt;
4978         err_at = 0;
4979         limit = ntohs(cp->chunk_length) - sizeof(struct sctp_init_chunk);
4980         at = param_offset;
4981         op_err = NULL;
4982         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Check for unrecognized param's\n");
4983         phdr = sctp_get_next_param(mat, at, &params, sizeof(params));
4984         while ((phdr != NULL) && ((size_t)limit >= sizeof(struct sctp_paramhdr))) {
4985                 ptype = ntohs(phdr->param_type);
4986                 plen = ntohs(phdr->param_length);
4987                 if ((plen > limit) || (plen < sizeof(struct sctp_paramhdr))) {
4988                         /* wacked parameter */
4989                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error %d\n", plen);
4990                         goto invalid_size;
4991                 }
4992                 limit -= SCTP_SIZE32(plen);
4993                 /*-
4994                  * All parameters for all chunks that we know/understand are
4995                  * listed here. We process them other places and make
4996                  * appropriate stop actions per the upper bits. However this
4997                  * is the generic routine processor's can call to get back
4998                  * an operr.. to either incorporate (init-ack) or send.
4999                  */
5000                 padded_size = SCTP_SIZE32(plen);
5001                 switch (ptype) {
5002                         /* Param's with variable size */
5003                 case SCTP_HEARTBEAT_INFO:
5004                 case SCTP_STATE_COOKIE:
5005                 case SCTP_UNRECOG_PARAM:
5006                 case SCTP_ERROR_CAUSE_IND:
5007                         /* ok skip fwd */
5008                         at += padded_size;
5009                         break;
5010                         /* Param's with variable size within a range */
5011                 case SCTP_CHUNK_LIST:
5012                 case SCTP_SUPPORTED_CHUNK_EXT:
5013                         if (padded_size > (sizeof(struct sctp_supported_chunk_types_param) + (sizeof(uint8_t) * SCTP_MAX_SUPPORTED_EXT))) {
5014                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error chklist %d\n", plen);
5015                                 goto invalid_size;
5016                         }
5017                         at += padded_size;
5018                         break;
5019                 case SCTP_SUPPORTED_ADDRTYPE:
5020                         if (padded_size > SCTP_MAX_ADDR_PARAMS_SIZE) {
5021                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error supaddrtype %d\n", plen);
5022                                 goto invalid_size;
5023                         }
5024                         at += padded_size;
5025                         break;
5026                 case SCTP_RANDOM:
5027                         if (padded_size > (sizeof(struct sctp_auth_random) + SCTP_RANDOM_MAX_SIZE)) {
5028                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error random %d\n", plen);
5029                                 goto invalid_size;
5030                         }
5031                         at += padded_size;
5032                         break;
5033                 case SCTP_SET_PRIM_ADDR:
5034                 case SCTP_DEL_IP_ADDRESS:
5035                 case SCTP_ADD_IP_ADDRESS:
5036                         if ((padded_size != sizeof(struct sctp_asconf_addrv4_param)) &&
5037                             (padded_size != sizeof(struct sctp_asconf_addr_param))) {
5038                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error setprim %d\n", plen);
5039                                 goto invalid_size;
5040                         }
5041                         at += padded_size;
5042                         break;
5043                         /* Param's with a fixed size */
5044                 case SCTP_IPV4_ADDRESS:
5045                         if (padded_size != sizeof(struct sctp_ipv4addr_param)) {
5046                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error ipv4 addr %d\n", plen);
5047                                 goto invalid_size;
5048                         }
5049                         at += padded_size;
5050                         break;
5051                 case SCTP_IPV6_ADDRESS:
5052                         if (padded_size != sizeof(struct sctp_ipv6addr_param)) {
5053                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error ipv6 addr %d\n", plen);
5054                                 goto invalid_size;
5055                         }
5056                         at += padded_size;
5057                         break;
5058                 case SCTP_COOKIE_PRESERVE:
5059                         if (padded_size != sizeof(struct sctp_cookie_perserve_param)) {
5060                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error cookie-preserve %d\n", plen);
5061                                 goto invalid_size;
5062                         }
5063                         at += padded_size;
5064                         break;
5065                 case SCTP_HAS_NAT_SUPPORT:
5066                         *nat_friendly = 1;
5067                         /* fall through */
5068                 case SCTP_PRSCTP_SUPPORTED:
5069                         if (padded_size != sizeof(struct sctp_paramhdr)) {
5070                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error prsctp/nat support %d\n", plen);
5071                                 goto invalid_size;
5072                         }
5073                         at += padded_size;
5074                         break;
5075                 case SCTP_ECN_CAPABLE:
5076                         if (padded_size != sizeof(struct sctp_paramhdr)) {
5077                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error ecn %d\n", plen);
5078                                 goto invalid_size;
5079                         }
5080                         at += padded_size;
5081                         break;
5082                 case SCTP_ULP_ADAPTATION:
5083                         if (padded_size != sizeof(struct sctp_adaptation_layer_indication)) {
5084                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error adapatation %d\n", plen);
5085                                 goto invalid_size;
5086                         }
5087                         at += padded_size;
5088                         break;
5089                 case SCTP_SUCCESS_REPORT:
5090                         if (padded_size != sizeof(struct sctp_asconf_paramhdr)) {
5091                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error success %d\n", plen);
5092                                 goto invalid_size;
5093                         }
5094                         at += padded_size;
5095                         break;
5096                 case SCTP_HOSTNAME_ADDRESS:
5097                         {
5098                                 /* We can NOT handle HOST NAME addresses!! */
5099                                 int l_len;
5100
5101                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Can't handle hostname addresses.. abort processing\n");
5102                                 *abort_processing = 1;
5103                                 if (op_err == NULL) {
5104                                         /* Ok need to try to get a mbuf */
5105 #ifdef INET6
5106                                         l_len = SCTP_MIN_OVERHEAD;
5107 #else
5108                                         l_len = SCTP_MIN_V4_OVERHEAD;
5109 #endif
5110                                         l_len += sizeof(struct sctp_chunkhdr);
5111                                         l_len += plen;
5112                                         l_len += sizeof(struct sctp_paramhdr);
5113                                         op_err = sctp_get_mbuf_for_msg(l_len, 0, M_NOWAIT, 1, MT_DATA);
5114                                         if (op_err) {
5115                                                 SCTP_BUF_LEN(op_err) = 0;
5116                                                 /*
5117                                                  * pre-reserve space for ip
5118                                                  * and sctp header  and
5119                                                  * chunk hdr
5120                                                  */
5121 #ifdef INET6
5122                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip6_hdr));
5123 #else
5124                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip));
5125 #endif
5126                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctphdr));
5127                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctp_chunkhdr));
5128                                         }
5129                                 }
5130                                 if (op_err) {
5131                                         /* If we have space */
5132                                         struct sctp_paramhdr s;
5133
5134                                         if (err_at % 4) {
5135                                                 uint32_t cpthis = 0;
5136
5137                                                 pad_needed = 4 - (err_at % 4);
5138                                                 m_copyback(op_err, err_at, pad_needed, (caddr_t)&cpthis);
5139                                                 err_at += pad_needed;
5140                                         }
5141                                         s.param_type = htons(SCTP_CAUSE_UNRESOLVABLE_ADDR);
5142                                         s.param_length = htons(sizeof(s) + plen);
5143                                         m_copyback(op_err, err_at, sizeof(s), (caddr_t)&s);
5144                                         err_at += sizeof(s);
5145                                         if (plen > sizeof(tempbuf)) {
5146                                                 plen = sizeof(tempbuf);
5147                                         }
5148                                         phdr = sctp_get_next_param(mat, at, (struct sctp_paramhdr *)tempbuf, plen);
5149                                         if (phdr == NULL) {
5150                                                 sctp_m_freem(op_err);
5151                                                 /*
5152                                                  * we are out of memory but
5153                                                  * we still need to have a
5154                                                  * look at what to do (the
5155                                                  * system is in trouble
5156                                                  * though).
5157                                                  */
5158                                                 return (NULL);
5159                                         }
5160                                         m_copyback(op_err, err_at, plen, (caddr_t)phdr);
5161                                 }
5162                                 return (op_err);
5163                                 break;
5164                         }
5165                 default:
5166                         /*
5167                          * we do not recognize the parameter figure out what
5168                          * we do.
5169                          */
5170                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Hit default param %x\n", ptype);
5171                         if ((ptype & 0x4000) == 0x4000) {
5172                                 /* Report bit is set?? */
5173                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "report op err\n");
5174                                 if (op_err == NULL) {
5175                                         int l_len;
5176
5177                                         /* Ok need to try to get an mbuf */
5178 #ifdef INET6
5179                                         l_len = SCTP_MIN_OVERHEAD;
5180 #else
5181                                         l_len = SCTP_MIN_V4_OVERHEAD;
5182 #endif
5183                                         l_len += sizeof(struct sctp_chunkhdr);
5184                                         l_len += plen;
5185                                         l_len += sizeof(struct sctp_paramhdr);
5186                                         op_err = sctp_get_mbuf_for_msg(l_len, 0, M_NOWAIT, 1, MT_DATA);
5187                                         if (op_err) {
5188                                                 SCTP_BUF_LEN(op_err) = 0;
5189 #ifdef INET6
5190                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip6_hdr));
5191 #else
5192                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip));
5193 #endif
5194                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctphdr));
5195                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctp_chunkhdr));
5196                                         }
5197                                 }
5198                                 if (op_err) {
5199                                         /* If we have space */
5200                                         struct sctp_paramhdr s;
5201
5202                                         if (err_at % 4) {
5203                                                 uint32_t cpthis = 0;
5204
5205                                                 pad_needed = 4 - (err_at % 4);
5206                                                 m_copyback(op_err, err_at, pad_needed, (caddr_t)&cpthis);
5207                                                 err_at += pad_needed;
5208                                         }
5209                                         s.param_type = htons(SCTP_UNRECOG_PARAM);
5210                                         s.param_length = htons(sizeof(s) + plen);
5211                                         m_copyback(op_err, err_at, sizeof(s), (caddr_t)&s);
5212                                         err_at += sizeof(s);
5213                                         if (plen > sizeof(tempbuf)) {
5214                                                 plen = sizeof(tempbuf);
5215                                         }
5216                                         phdr = sctp_get_next_param(mat, at, (struct sctp_paramhdr *)tempbuf, plen);
5217                                         if (phdr == NULL) {
5218                                                 sctp_m_freem(op_err);
5219                                                 /*
5220                                                  * we are out of memory but
5221                                                  * we still need to have a
5222                                                  * look at what to do (the
5223                                                  * system is in trouble
5224                                                  * though).
5225                                                  */
5226                                                 op_err = NULL;
5227                                                 goto more_processing;
5228                                         }
5229                                         m_copyback(op_err, err_at, plen, (caddr_t)phdr);
5230                                         err_at += plen;
5231                                 }
5232                         }
5233         more_processing:
5234                         if ((ptype & 0x8000) == 0x0000) {
5235                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "stop proc\n");
5236                                 return (op_err);
5237                         } else {
5238                                 /* skip this chunk and continue processing */
5239                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "move on\n");
5240                                 at += SCTP_SIZE32(plen);
5241                         }
5242                         break;
5243
5244                 }
5245                 phdr = sctp_get_next_param(mat, at, &params, sizeof(params));
5246         }
5247         return (op_err);
5248 invalid_size:
5249         SCTPDBG(SCTP_DEBUG_OUTPUT1, "abort flag set\n");
5250         *abort_processing = 1;
5251         if ((op_err == NULL) && phdr) {
5252                 int l_len;
5253 #ifdef INET6
5254                 l_len = SCTP_MIN_OVERHEAD;
5255 #else
5256                 l_len = SCTP_MIN_V4_OVERHEAD;
5257 #endif
5258                 l_len += sizeof(struct sctp_chunkhdr);
5259                 l_len += (2 * sizeof(struct sctp_paramhdr));
5260                 op_err = sctp_get_mbuf_for_msg(l_len, 0, M_NOWAIT, 1, MT_DATA);
5261                 if (op_err) {
5262                         SCTP_BUF_LEN(op_err) = 0;
5263 #ifdef INET6
5264                         SCTP_BUF_RESV_UF(op_err, sizeof(struct ip6_hdr));
5265 #else
5266                         SCTP_BUF_RESV_UF(op_err, sizeof(struct ip));
5267 #endif
5268                         SCTP_BUF_RESV_UF(op_err, sizeof(struct sctphdr));
5269                         SCTP_BUF_RESV_UF(op_err, sizeof(struct sctp_chunkhdr));
5270                 }
5271         }
5272         if ((op_err) && phdr) {
5273                 struct sctp_paramhdr s;
5274
5275                 if (err_at % 4) {
5276                         uint32_t cpthis = 0;
5277
5278                         pad_needed = 4 - (err_at % 4);
5279                         m_copyback(op_err, err_at, pad_needed, (caddr_t)&cpthis);
5280                         err_at += pad_needed;
5281                 }
5282                 s.param_type = htons(SCTP_CAUSE_PROTOCOL_VIOLATION);
5283                 s.param_length = htons(sizeof(s) + sizeof(struct sctp_paramhdr));
5284                 m_copyback(op_err, err_at, sizeof(s), (caddr_t)&s);
5285                 err_at += sizeof(s);
5286                 /* Only copy back the p-hdr that caused the issue */
5287                 m_copyback(op_err, err_at, sizeof(struct sctp_paramhdr), (caddr_t)phdr);
5288         }
5289         return (op_err);
5290 }
5291
5292 static int
5293 sctp_are_there_new_addresses(struct sctp_association *asoc,
5294     struct mbuf *in_initpkt, int offset, struct sockaddr *src)
5295 {
5296         /*
5297          * Given a INIT packet, look through the packet to verify that there
5298          * are NO new addresses. As we go through the parameters add reports
5299          * of any un-understood parameters that require an error.  Also we
5300          * must return (1) to drop the packet if we see a un-understood
5301          * parameter that tells us to drop the chunk.
5302          */
5303         struct sockaddr *sa_touse;
5304         struct sockaddr *sa;
5305         struct sctp_paramhdr *phdr, params;
5306         uint16_t ptype, plen;
5307         uint8_t fnd;
5308         struct sctp_nets *net;
5309         int check_src;
5310 #ifdef INET
5311         struct sockaddr_in sin4, *sa4;
5312 #endif
5313 #ifdef INET6
5314         struct sockaddr_in6 sin6, *sa6;
5315 #endif
5316
5317 #ifdef INET
5318         memset(&sin4, 0, sizeof(sin4));
5319         sin4.sin_family = AF_INET;
5320         sin4.sin_len = sizeof(sin4);
5321 #endif
5322 #ifdef INET6
5323         memset(&sin6, 0, sizeof(sin6));
5324         sin6.sin6_family = AF_INET6;
5325         sin6.sin6_len = sizeof(sin6);
5326 #endif
5327         /* First what about the src address of the pkt ? */
5328         check_src = 0;
5329         switch (src->sa_family) {
5330 #ifdef INET
5331         case AF_INET:
5332                 if (asoc->scope.ipv4_addr_legal) {
5333                         check_src = 1;
5334                 }
5335                 break;
5336 #endif
5337 #ifdef INET6
5338         case AF_INET6:
5339                 if (asoc->scope.ipv6_addr_legal) {
5340                         check_src = 1;
5341                 }
5342                 break;
5343 #endif
5344         default:
5345                 /* TSNH */
5346                 break;
5347         }
5348         if (check_src) {
5349                 fnd = 0;
5350                 TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
5351                         sa = (struct sockaddr *)&net->ro._l_addr;
5352                         if (sa->sa_family == src->sa_family) {
5353 #ifdef INET
5354                                 if (sa->sa_family == AF_INET) {
5355                                         struct sockaddr_in *src4;
5356
5357                                         sa4 = (struct sockaddr_in *)sa;
5358                                         src4 = (struct sockaddr_in *)src;
5359                                         if (sa4->sin_addr.s_addr == src4->sin_addr.s_addr) {
5360                                                 fnd = 1;
5361                                                 break;
5362                                         }
5363                                 }
5364 #endif
5365 #ifdef INET6
5366                                 if (sa->sa_family == AF_INET6) {
5367                                         struct sockaddr_in6 *src6;
5368
5369                                         sa6 = (struct sockaddr_in6 *)sa;
5370                                         src6 = (struct sockaddr_in6 *)src;
5371                                         if (SCTP6_ARE_ADDR_EQUAL(sa6, src6)) {
5372                                                 fnd = 1;
5373                                                 break;
5374                                         }
5375                                 }
5376 #endif
5377                         }
5378                 }
5379                 if (fnd == 0) {
5380                         /* New address added! no need to look further. */
5381                         return (1);
5382                 }
5383         }
5384         /* Ok so far lets munge through the rest of the packet */
5385         offset += sizeof(struct sctp_init_chunk);
5386         phdr = sctp_get_next_param(in_initpkt, offset, &params, sizeof(params));
5387         while (phdr) {
5388                 sa_touse = NULL;
5389                 ptype = ntohs(phdr->param_type);
5390                 plen = ntohs(phdr->param_length);
5391                 switch (ptype) {
5392 #ifdef INET
5393                 case SCTP_IPV4_ADDRESS:
5394                         {
5395                                 struct sctp_ipv4addr_param *p4, p4_buf;
5396
5397                                 if (plen != sizeof(struct sctp_ipv4addr_param)) {
5398                                         return (1);
5399                                 }
5400                                 phdr = sctp_get_next_param(in_initpkt, offset,
5401                                     (struct sctp_paramhdr *)&p4_buf, sizeof(p4_buf));
5402                                 if (phdr == NULL) {
5403                                         return (1);
5404                                 }
5405                                 if (asoc->scope.ipv4_addr_legal) {
5406                                         p4 = (struct sctp_ipv4addr_param *)phdr;
5407                                         sin4.sin_addr.s_addr = p4->addr;
5408                                         sa_touse = (struct sockaddr *)&sin4;
5409                                 }
5410                                 break;
5411                         }
5412 #endif
5413 #ifdef INET6
5414                 case SCTP_IPV6_ADDRESS:
5415                         {
5416                                 struct sctp_ipv6addr_param *p6, p6_buf;
5417
5418                                 if (plen != sizeof(struct sctp_ipv6addr_param)) {
5419                                         return (1);
5420                                 }
5421                                 phdr = sctp_get_next_param(in_initpkt, offset,
5422                                     (struct sctp_paramhdr *)&p6_buf, sizeof(p6_buf));
5423                                 if (phdr == NULL) {
5424                                         return (1);
5425                                 }
5426                                 if (asoc->scope.ipv6_addr_legal) {
5427                                         p6 = (struct sctp_ipv6addr_param *)phdr;
5428                                         memcpy((caddr_t)&sin6.sin6_addr, p6->addr,
5429                                             sizeof(p6->addr));
5430                                         sa_touse = (struct sockaddr *)&sin6;
5431                                 }
5432                                 break;
5433                         }
5434 #endif
5435                 default:
5436                         sa_touse = NULL;
5437                         break;
5438                 }
5439                 if (sa_touse) {
5440                         /* ok, sa_touse points to one to check */
5441                         fnd = 0;
5442                         TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
5443                                 sa = (struct sockaddr *)&net->ro._l_addr;
5444                                 if (sa->sa_family != sa_touse->sa_family) {
5445                                         continue;
5446                                 }
5447 #ifdef INET
5448                                 if (sa->sa_family == AF_INET) {
5449                                         sa4 = (struct sockaddr_in *)sa;
5450                                         if (sa4->sin_addr.s_addr ==
5451                                             sin4.sin_addr.s_addr) {
5452                                                 fnd = 1;
5453                                                 break;
5454                                         }
5455                                 }
5456 #endif
5457 #ifdef INET6
5458                                 if (sa->sa_family == AF_INET6) {
5459                                         sa6 = (struct sockaddr_in6 *)sa;
5460                                         if (SCTP6_ARE_ADDR_EQUAL(
5461                                             sa6, &sin6)) {
5462                                                 fnd = 1;
5463                                                 break;
5464                                         }
5465                                 }
5466 #endif
5467                         }
5468                         if (!fnd) {
5469                                 /* New addr added! no need to look further */
5470                                 return (1);
5471                         }
5472                 }
5473                 offset += SCTP_SIZE32(plen);
5474                 phdr = sctp_get_next_param(in_initpkt, offset, &params, sizeof(params));
5475         }
5476         return (0);
5477 }
5478
5479 /*
5480  * Given a MBUF chain that was sent into us containing an INIT. Build a
5481  * INIT-ACK with COOKIE and send back. We assume that the in_initpkt has done
5482  * a pullup to include IPv6/4header, SCTP header and initial part of INIT
5483  * message (i.e. the struct sctp_init_msg).
5484  */
5485 void
5486 sctp_send_initiate_ack(struct sctp_inpcb *inp, struct sctp_tcb *stcb,
5487     struct sctp_nets *src_net, struct mbuf *init_pkt,
5488     int iphlen, int offset,
5489     struct sockaddr *src, struct sockaddr *dst,
5490     struct sctphdr *sh, struct sctp_init_chunk *init_chk,
5491     uint8_t mflowtype, uint32_t mflowid,
5492     uint32_t vrf_id, uint16_t port)
5493 {
5494         struct sctp_association *asoc;
5495         struct mbuf *m, *m_tmp, *m_last, *m_cookie, *op_err;
5496         struct sctp_init_ack_chunk *initack;
5497         struct sctp_adaptation_layer_indication *ali;
5498         struct sctp_supported_chunk_types_param *pr_supported;
5499         struct sctp_paramhdr *ph;
5500         union sctp_sockstore *over_addr;
5501         struct sctp_scoping scp;
5502         struct timeval now;
5503 #ifdef INET
5504         struct sockaddr_in *dst4 = (struct sockaddr_in *)dst;
5505         struct sockaddr_in *src4 = (struct sockaddr_in *)src;
5506         struct sockaddr_in *sin;
5507 #endif
5508 #ifdef INET6
5509         struct sockaddr_in6 *dst6 = (struct sockaddr_in6 *)dst;
5510         struct sockaddr_in6 *src6 = (struct sockaddr_in6 *)src;
5511         struct sockaddr_in6 *sin6;
5512 #endif
5513         struct sockaddr *to;
5514         struct sctp_state_cookie stc;
5515         struct sctp_nets *net = NULL;
5516         uint8_t *signature = NULL;
5517         int cnt_inits_to = 0;
5518         uint16_t his_limit, i_want;
5519         int abort_flag;
5520         int nat_friendly = 0;
5521         int error;
5522         struct socket *so;
5523         uint16_t num_ext, chunk_len, padding_len, parameter_len;
5524
5525         if (stcb) {
5526                 asoc = &stcb->asoc;
5527         } else {
5528                 asoc = NULL;
5529         }
5530         if ((asoc != NULL) &&
5531             (SCTP_GET_STATE(asoc) != SCTP_STATE_COOKIE_WAIT)) {
5532                 if (sctp_are_there_new_addresses(asoc, init_pkt, offset, src)) {
5533                         /*
5534                          * new addresses, out of here in non-cookie-wait
5535                          * states
5536                          *
5537                          * Send an ABORT, without the new address error
5538                          * cause. This looks no different than if no
5539                          * listener was present.
5540                          */
5541                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
5542                             "Address added");
5543                         sctp_send_abort(init_pkt, iphlen, src, dst, sh, 0, op_err,
5544                             mflowtype, mflowid, inp->fibnum,
5545                             vrf_id, port);
5546                         return;
5547                 }
5548                 if (src_net != NULL && (src_net->port != port)) {
5549                         /*
5550                          * change of remote encapsulation port, out of here
5551                          * in non-cookie-wait states
5552                          *
5553                          * Send an ABORT, without an specific error cause.
5554                          * This looks no different than if no listener was
5555                          * present.
5556                          */
5557                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
5558                             "Remote encapsulation port changed");
5559                         sctp_send_abort(init_pkt, iphlen, src, dst, sh, 0, op_err,
5560                             mflowtype, mflowid, inp->fibnum,
5561                             vrf_id, port);
5562                         return;
5563                 }
5564         }
5565         abort_flag = 0;
5566         op_err = sctp_arethere_unrecognized_parameters(init_pkt,
5567             (offset + sizeof(struct sctp_init_chunk)),
5568             &abort_flag, (struct sctp_chunkhdr *)init_chk, &nat_friendly);
5569         if (abort_flag) {
5570 do_a_abort:
5571                 if (op_err == NULL) {
5572                         char msg[SCTP_DIAG_INFO_LEN];
5573
5574                         snprintf(msg, sizeof(msg), "%s:%d at %s", __FILE__, __LINE__, __func__);
5575                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
5576                             msg);
5577                 }
5578                 sctp_send_abort(init_pkt, iphlen, src, dst, sh,
5579                     init_chk->init.initiate_tag, op_err,
5580                     mflowtype, mflowid, inp->fibnum,
5581                     vrf_id, port);
5582                 return;
5583         }
5584         m = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
5585         if (m == NULL) {
5586                 /* No memory, INIT timer will re-attempt. */
5587                 if (op_err)
5588                         sctp_m_freem(op_err);
5589                 return;
5590         }
5591         chunk_len = (uint16_t) sizeof(struct sctp_init_ack_chunk);
5592         padding_len = 0;
5593
5594         /*
5595          * We might not overwrite the identification[] completely and on
5596          * some platforms time_entered will contain some padding. Therefore
5597          * zero out the cookie to avoid putting uninitialized memory on the
5598          * wire.
5599          */
5600         memset(&stc, 0, sizeof(struct sctp_state_cookie));
5601
5602         /* the time I built cookie */
5603         (void)SCTP_GETTIME_TIMEVAL(&now);
5604         stc.time_entered.tv_sec = now.tv_sec;
5605         stc.time_entered.tv_usec = now.tv_usec;
5606
5607         /* populate any tie tags */
5608         if (asoc != NULL) {
5609                 /* unlock before tag selections */
5610                 stc.tie_tag_my_vtag = asoc->my_vtag_nonce;
5611                 stc.tie_tag_peer_vtag = asoc->peer_vtag_nonce;
5612                 stc.cookie_life = asoc->cookie_life;
5613                 net = asoc->primary_destination;
5614         } else {
5615                 stc.tie_tag_my_vtag = 0;
5616                 stc.tie_tag_peer_vtag = 0;
5617                 /* life I will award this cookie */
5618                 stc.cookie_life = inp->sctp_ep.def_cookie_life;
5619         }
5620
5621         /* copy in the ports for later check */
5622         stc.myport = sh->dest_port;
5623         stc.peerport = sh->src_port;
5624
5625         /*
5626          * If we wanted to honor cookie life extensions, we would add to
5627          * stc.cookie_life. For now we should NOT honor any extension
5628          */
5629         stc.site_scope = stc.local_scope = stc.loopback_scope = 0;
5630         if (inp->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
5631                 stc.ipv6_addr_legal = 1;
5632                 if (SCTP_IPV6_V6ONLY(inp)) {
5633                         stc.ipv4_addr_legal = 0;
5634                 } else {
5635                         stc.ipv4_addr_legal = 1;
5636                 }
5637         } else {
5638                 stc.ipv6_addr_legal = 0;
5639                 stc.ipv4_addr_legal = 1;
5640         }
5641         stc.ipv4_scope = 0;
5642         if (net == NULL) {
5643                 to = src;
5644                 switch (dst->sa_family) {
5645 #ifdef INET
5646                 case AF_INET:
5647                         {
5648                                 /* lookup address */
5649                                 stc.address[0] = src4->sin_addr.s_addr;
5650                                 stc.address[1] = 0;
5651                                 stc.address[2] = 0;
5652                                 stc.address[3] = 0;
5653                                 stc.addr_type = SCTP_IPV4_ADDRESS;
5654                                 /* local from address */
5655                                 stc.laddress[0] = dst4->sin_addr.s_addr;
5656                                 stc.laddress[1] = 0;
5657                                 stc.laddress[2] = 0;
5658                                 stc.laddress[3] = 0;
5659                                 stc.laddr_type = SCTP_IPV4_ADDRESS;
5660                                 /* scope_id is only for v6 */
5661                                 stc.scope_id = 0;
5662                                 if ((IN4_ISPRIVATE_ADDRESS(&src4->sin_addr)) ||
5663                                     (IN4_ISPRIVATE_ADDRESS(&dst4->sin_addr))) {
5664                                         stc.ipv4_scope = 1;
5665                                 }
5666                                 /* Must use the address in this case */
5667                                 if (sctp_is_address_on_local_host(src, vrf_id)) {
5668                                         stc.loopback_scope = 1;
5669                                         stc.ipv4_scope = 1;
5670                                         stc.site_scope = 1;
5671                                         stc.local_scope = 0;
5672                                 }
5673                                 break;
5674                         }
5675 #endif
5676 #ifdef INET6
5677                 case AF_INET6:
5678                         {
5679                                 stc.addr_type = SCTP_IPV6_ADDRESS;
5680                                 memcpy(&stc.address, &src6->sin6_addr, sizeof(struct in6_addr));
5681                                 stc.scope_id = ntohs(in6_getscope(&src6->sin6_addr));
5682                                 if (sctp_is_address_on_local_host(src, vrf_id)) {
5683                                         stc.loopback_scope = 1;
5684                                         stc.local_scope = 0;
5685                                         stc.site_scope = 1;
5686                                         stc.ipv4_scope = 1;
5687                                 } else if (IN6_IS_ADDR_LINKLOCAL(&src6->sin6_addr) ||
5688                                     IN6_IS_ADDR_LINKLOCAL(&dst6->sin6_addr)) {
5689                                         /*
5690                                          * If the new destination or source
5691                                          * is a LINK_LOCAL we must have
5692                                          * common both site and local scope.
5693                                          * Don't set local scope though
5694                                          * since we must depend on the
5695                                          * source to be added implicitly. We
5696                                          * cannot assure just because we
5697                                          * share one link that all links are
5698                                          * common.
5699                                          */
5700                                         stc.local_scope = 0;
5701                                         stc.site_scope = 1;
5702                                         stc.ipv4_scope = 1;
5703                                         /*
5704                                          * we start counting for the private
5705                                          * address stuff at 1. since the
5706                                          * link local we source from won't
5707                                          * show up in our scoped count.
5708                                          */
5709                                         cnt_inits_to = 1;
5710                                         /*
5711                                          * pull out the scope_id from
5712                                          * incoming pkt
5713                                          */
5714                                 } else if (IN6_IS_ADDR_SITELOCAL(&src6->sin6_addr) ||
5715                                     IN6_IS_ADDR_SITELOCAL(&dst6->sin6_addr)) {
5716                                         /*
5717                                          * If the new destination or source
5718                                          * is SITE_LOCAL then we must have
5719                                          * site scope in common.
5720                                          */
5721                                         stc.site_scope = 1;
5722                                 }
5723                                 memcpy(&stc.laddress, &dst6->sin6_addr, sizeof(struct in6_addr));
5724                                 stc.laddr_type = SCTP_IPV6_ADDRESS;
5725                                 break;
5726                         }
5727 #endif
5728                 default:
5729                         /* TSNH */
5730                         goto do_a_abort;
5731                         break;
5732                 }
5733         } else {
5734                 /* set the scope per the existing tcb */
5735
5736 #ifdef INET6
5737                 struct sctp_nets *lnet;
5738 #endif
5739
5740                 stc.loopback_scope = asoc->scope.loopback_scope;
5741                 stc.ipv4_scope = asoc->scope.ipv4_local_scope;
5742                 stc.site_scope = asoc->scope.site_scope;
5743                 stc.local_scope = asoc->scope.local_scope;
5744 #ifdef INET6
5745                 /* Why do we not consider IPv4 LL addresses? */
5746                 TAILQ_FOREACH(lnet, &asoc->nets, sctp_next) {
5747                         if (lnet->ro._l_addr.sin6.sin6_family == AF_INET6) {
5748                                 if (IN6_IS_ADDR_LINKLOCAL(&lnet->ro._l_addr.sin6.sin6_addr)) {
5749                                         /*
5750                                          * if we have a LL address, start
5751                                          * counting at 1.
5752                                          */
5753                                         cnt_inits_to = 1;
5754                                 }
5755                         }
5756                 }
5757 #endif
5758                 /* use the net pointer */
5759                 to = (struct sockaddr *)&net->ro._l_addr;
5760                 switch (to->sa_family) {
5761 #ifdef INET
5762                 case AF_INET:
5763                         sin = (struct sockaddr_in *)to;
5764                         stc.address[0] = sin->sin_addr.s_addr;
5765                         stc.address[1] = 0;
5766                         stc.address[2] = 0;
5767                         stc.address[3] = 0;
5768                         stc.addr_type = SCTP_IPV4_ADDRESS;
5769                         if (net->src_addr_selected == 0) {
5770                                 /*
5771                                  * strange case here, the INIT should have
5772                                  * did the selection.
5773                                  */
5774                                 net->ro._s_addr = sctp_source_address_selection(inp,
5775                                     stcb, (sctp_route_t *) & net->ro,
5776                                     net, 0, vrf_id);
5777                                 if (net->ro._s_addr == NULL)
5778                                         return;
5779
5780                                 net->src_addr_selected = 1;
5781
5782                         }
5783                         stc.laddress[0] = net->ro._s_addr->address.sin.sin_addr.s_addr;
5784                         stc.laddress[1] = 0;
5785                         stc.laddress[2] = 0;
5786                         stc.laddress[3] = 0;
5787                         stc.laddr_type = SCTP_IPV4_ADDRESS;
5788                         /* scope_id is only for v6 */
5789                         stc.scope_id = 0;
5790                         break;
5791 #endif
5792 #ifdef INET6
5793                 case AF_INET6:
5794                         sin6 = (struct sockaddr_in6 *)to;
5795                         memcpy(&stc.address, &sin6->sin6_addr,
5796                             sizeof(struct in6_addr));
5797                         stc.addr_type = SCTP_IPV6_ADDRESS;
5798                         stc.scope_id = sin6->sin6_scope_id;
5799                         if (net->src_addr_selected == 0) {
5800                                 /*
5801                                  * strange case here, the INIT should have
5802                                  * done the selection.
5803                                  */
5804                                 net->ro._s_addr = sctp_source_address_selection(inp,
5805                                     stcb, (sctp_route_t *) & net->ro,
5806                                     net, 0, vrf_id);
5807                                 if (net->ro._s_addr == NULL)
5808                                         return;
5809
5810                                 net->src_addr_selected = 1;
5811                         }
5812                         memcpy(&stc.laddress, &net->ro._s_addr->address.sin6.sin6_addr,
5813                             sizeof(struct in6_addr));
5814                         stc.laddr_type = SCTP_IPV6_ADDRESS;
5815                         break;
5816 #endif
5817                 }
5818         }
5819         /* Now lets put the SCTP header in place */
5820         initack = mtod(m, struct sctp_init_ack_chunk *);
5821         /* Save it off for quick ref */
5822         stc.peers_vtag = ntohl(init_chk->init.initiate_tag);
5823         /* who are we */
5824         memcpy(stc.identification, SCTP_VERSION_STRING,
5825             min(strlen(SCTP_VERSION_STRING), sizeof(stc.identification)));
5826         memset(stc.reserved, 0, SCTP_RESERVE_SPACE);
5827         /* now the chunk header */
5828         initack->ch.chunk_type = SCTP_INITIATION_ACK;
5829         initack->ch.chunk_flags = 0;
5830         /* fill in later from mbuf we build */
5831         initack->ch.chunk_length = 0;
5832         /* place in my tag */
5833         if ((asoc != NULL) &&
5834             ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) ||
5835             (SCTP_GET_STATE(asoc) == SCTP_STATE_INUSE) ||
5836             (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED))) {
5837                 /* re-use the v-tags and init-seq here */
5838                 initack->init.initiate_tag = htonl(asoc->my_vtag);
5839                 initack->init.initial_tsn = htonl(asoc->init_seq_number);
5840         } else {
5841                 uint32_t vtag, itsn;
5842
5843                 if (asoc) {
5844                         atomic_add_int(&asoc->refcnt, 1);
5845                         SCTP_TCB_UNLOCK(stcb);
5846         new_tag:
5847                         vtag = sctp_select_a_tag(inp, inp->sctp_lport, sh->src_port, 1);
5848                         if ((asoc->peer_supports_nat) && (vtag == asoc->my_vtag)) {
5849                                 /*
5850                                  * Got a duplicate vtag on some guy behind a
5851                                  * nat make sure we don't use it.
5852                                  */
5853                                 goto new_tag;
5854                         }
5855                         initack->init.initiate_tag = htonl(vtag);
5856                         /* get a TSN to use too */
5857                         itsn = sctp_select_initial_TSN(&inp->sctp_ep);
5858                         initack->init.initial_tsn = htonl(itsn);
5859                         SCTP_TCB_LOCK(stcb);
5860                         atomic_add_int(&asoc->refcnt, -1);
5861                 } else {
5862                         SCTP_INP_INCR_REF(inp);
5863                         SCTP_INP_RUNLOCK(inp);
5864                         vtag = sctp_select_a_tag(inp, inp->sctp_lport, sh->src_port, 1);
5865                         initack->init.initiate_tag = htonl(vtag);
5866                         /* get a TSN to use too */
5867                         initack->init.initial_tsn = htonl(sctp_select_initial_TSN(&inp->sctp_ep));
5868                         SCTP_INP_RLOCK(inp);
5869                         SCTP_INP_DECR_REF(inp);
5870                 }
5871         }
5872         /* save away my tag to */
5873         stc.my_vtag = initack->init.initiate_tag;
5874
5875         /* set up some of the credits. */
5876         so = inp->sctp_socket;
5877         if (so == NULL) {
5878                 /* memory problem */
5879                 sctp_m_freem(m);
5880                 return;
5881         } else {
5882                 initack->init.a_rwnd = htonl(max(SCTP_SB_LIMIT_RCV(so), SCTP_MINIMAL_RWND));
5883         }
5884         /* set what I want */
5885         his_limit = ntohs(init_chk->init.num_inbound_streams);
5886         /* choose what I want */
5887         if (asoc != NULL) {
5888                 if (asoc->streamoutcnt > asoc->pre_open_streams) {
5889                         i_want = asoc->streamoutcnt;
5890                 } else {
5891                         i_want = asoc->pre_open_streams;
5892                 }
5893         } else {
5894                 i_want = inp->sctp_ep.pre_open_stream_count;
5895         }
5896         if (his_limit < i_want) {
5897                 /* I Want more :< */
5898                 initack->init.num_outbound_streams = init_chk->init.num_inbound_streams;
5899         } else {
5900                 /* I can have what I want :> */
5901                 initack->init.num_outbound_streams = htons(i_want);
5902         }
5903         /* tell him his limit. */
5904         initack->init.num_inbound_streams =
5905             htons(inp->sctp_ep.max_open_streams_intome);
5906
5907         /* adaptation layer indication parameter */
5908         if (inp->sctp_ep.adaptation_layer_indicator_provided) {
5909                 parameter_len = (uint16_t) sizeof(struct sctp_adaptation_layer_indication);
5910                 ali = (struct sctp_adaptation_layer_indication *)(mtod(m, caddr_t)+chunk_len);
5911                 ali->ph.param_type = htons(SCTP_ULP_ADAPTATION);
5912                 ali->ph.param_length = htons(parameter_len);
5913                 ali->indication = htonl(inp->sctp_ep.adaptation_layer_indicator);
5914                 chunk_len += parameter_len;
5915         }
5916
5917         /* ECN parameter */
5918         if (((asoc != NULL) && (asoc->ecn_supported == 1)) ||
5919             ((asoc == NULL) && (inp->ecn_supported == 1))) {
5920                 parameter_len = (uint16_t) sizeof(struct sctp_paramhdr);
5921                 ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
5922                 ph->param_type = htons(SCTP_ECN_CAPABLE);
5923                 ph->param_length = htons(parameter_len);
5924                 chunk_len += parameter_len;
5925         }
5926
5927         /* PR-SCTP supported parameter */
5928         if (((asoc != NULL) && (asoc->prsctp_supported == 1)) ||
5929             ((asoc == NULL) && (inp->prsctp_supported == 1))) {
5930                 parameter_len = (uint16_t) sizeof(struct sctp_paramhdr);
5931                 ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
5932                 ph->param_type = htons(SCTP_PRSCTP_SUPPORTED);
5933                 ph->param_length = htons(parameter_len);
5934                 chunk_len += parameter_len;
5935         }
5936
5937         /* Add NAT friendly parameter */
5938         if (nat_friendly) {
5939                 parameter_len = (uint16_t) sizeof(struct sctp_paramhdr);
5940                 ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
5941                 ph->param_type = htons(SCTP_HAS_NAT_SUPPORT);
5942                 ph->param_length = htons(parameter_len);
5943                 chunk_len += parameter_len;
5944         }
5945
5946         /* And now tell the peer which extensions we support */
5947         num_ext = 0;
5948         pr_supported = (struct sctp_supported_chunk_types_param *)(mtod(m, caddr_t)+chunk_len);
5949         if (((asoc != NULL) && (asoc->prsctp_supported == 1)) ||
5950             ((asoc == NULL) && (inp->prsctp_supported == 1))) {
5951                 pr_supported->chunk_types[num_ext++] = SCTP_FORWARD_CUM_TSN;
5952                 if (((asoc != NULL) && (asoc->idata_supported == 1)) ||
5953                     ((asoc == NULL) && (inp->idata_supported == 1))) {
5954                         pr_supported->chunk_types[num_ext++] = SCTP_IFORWARD_CUM_TSN;
5955                 }
5956         }
5957         if (((asoc != NULL) && (asoc->auth_supported == 1)) ||
5958             ((asoc == NULL) && (inp->auth_supported == 1))) {
5959                 pr_supported->chunk_types[num_ext++] = SCTP_AUTHENTICATION;
5960         }
5961         if (((asoc != NULL) && (asoc->asconf_supported == 1)) ||
5962             ((asoc == NULL) && (inp->asconf_supported == 1))) {
5963                 pr_supported->chunk_types[num_ext++] = SCTP_ASCONF;
5964                 pr_supported->chunk_types[num_ext++] = SCTP_ASCONF_ACK;
5965         }
5966         if (((asoc != NULL) && (asoc->reconfig_supported == 1)) ||
5967             ((asoc == NULL) && (inp->reconfig_supported == 1))) {
5968                 pr_supported->chunk_types[num_ext++] = SCTP_STREAM_RESET;
5969         }
5970         if (((asoc != NULL) && (asoc->idata_supported == 1)) ||
5971             ((asoc == NULL) && (inp->idata_supported == 1))) {
5972                 pr_supported->chunk_types[num_ext++] = SCTP_IDATA;
5973         }
5974         if (((asoc != NULL) && (asoc->nrsack_supported == 1)) ||
5975             ((asoc == NULL) && (inp->nrsack_supported == 1))) {
5976                 pr_supported->chunk_types[num_ext++] = SCTP_NR_SELECTIVE_ACK;
5977         }
5978         if (((asoc != NULL) && (asoc->pktdrop_supported == 1)) ||
5979             ((asoc == NULL) && (inp->pktdrop_supported == 1))) {
5980                 pr_supported->chunk_types[num_ext++] = SCTP_PACKET_DROPPED;
5981         }
5982         if (num_ext > 0) {
5983                 parameter_len = (uint16_t) sizeof(struct sctp_supported_chunk_types_param) + num_ext;
5984                 pr_supported->ph.param_type = htons(SCTP_SUPPORTED_CHUNK_EXT);
5985                 pr_supported->ph.param_length = htons(parameter_len);
5986                 padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
5987                 chunk_len += parameter_len;
5988         }
5989
5990         /* add authentication parameters */
5991         if (((asoc != NULL) && (asoc->auth_supported == 1)) ||
5992             ((asoc == NULL) && (inp->auth_supported == 1))) {
5993                 struct sctp_auth_random *randp;
5994                 struct sctp_auth_hmac_algo *hmacs;
5995                 struct sctp_auth_chunk_list *chunks;
5996
5997                 if (padding_len > 0) {
5998                         memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
5999                         chunk_len += padding_len;
6000                         padding_len = 0;
6001                 }
6002                 /* generate and add RANDOM parameter */
6003                 randp = (struct sctp_auth_random *)(mtod(m, caddr_t)+chunk_len);
6004                 parameter_len = (uint16_t) sizeof(struct sctp_auth_random) +
6005                     SCTP_AUTH_RANDOM_SIZE_DEFAULT;
6006                 randp->ph.param_type = htons(SCTP_RANDOM);
6007                 randp->ph.param_length = htons(parameter_len);
6008                 SCTP_READ_RANDOM(randp->random_data, SCTP_AUTH_RANDOM_SIZE_DEFAULT);
6009                 padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
6010                 chunk_len += parameter_len;
6011
6012                 if (padding_len > 0) {
6013                         memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
6014                         chunk_len += padding_len;
6015                         padding_len = 0;
6016                 }
6017                 /* add HMAC_ALGO parameter */
6018                 hmacs = (struct sctp_auth_hmac_algo *)(mtod(m, caddr_t)+chunk_len);
6019                 parameter_len = (uint16_t) sizeof(struct sctp_auth_hmac_algo) +
6020                     sctp_serialize_hmaclist(inp->sctp_ep.local_hmacs,
6021                     (uint8_t *) hmacs->hmac_ids);
6022                 hmacs->ph.param_type = htons(SCTP_HMAC_LIST);
6023                 hmacs->ph.param_length = htons(parameter_len);
6024                 padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
6025                 chunk_len += parameter_len;
6026
6027                 if (padding_len > 0) {
6028                         memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
6029                         chunk_len += padding_len;
6030                         padding_len = 0;
6031                 }
6032                 /* add CHUNKS parameter */
6033                 chunks = (struct sctp_auth_chunk_list *)(mtod(m, caddr_t)+chunk_len);
6034                 parameter_len = (uint16_t) sizeof(struct sctp_auth_chunk_list) +
6035                     sctp_serialize_auth_chunks(inp->sctp_ep.local_auth_chunks,
6036                     chunks->chunk_types);
6037                 chunks->ph.param_type = htons(SCTP_CHUNK_LIST);
6038                 chunks->ph.param_length = htons(parameter_len);
6039                 padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
6040                 chunk_len += parameter_len;
6041         }
6042         SCTP_BUF_LEN(m) = chunk_len;
6043         m_last = m;
6044         /* now the addresses */
6045         /*
6046          * To optimize this we could put the scoping stuff into a structure
6047          * and remove the individual uint8's from the stc structure. Then we
6048          * could just sifa in the address within the stc.. but for now this
6049          * is a quick hack to get the address stuff teased apart.
6050          */
6051         scp.ipv4_addr_legal = stc.ipv4_addr_legal;
6052         scp.ipv6_addr_legal = stc.ipv6_addr_legal;
6053         scp.loopback_scope = stc.loopback_scope;
6054         scp.ipv4_local_scope = stc.ipv4_scope;
6055         scp.local_scope = stc.local_scope;
6056         scp.site_scope = stc.site_scope;
6057         m_last = sctp_add_addresses_to_i_ia(inp, stcb, &scp, m_last,
6058             cnt_inits_to,
6059             &padding_len, &chunk_len);
6060         /* padding_len can only be positive, if no addresses have been added */
6061         if (padding_len > 0) {
6062                 memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
6063                 chunk_len += padding_len;
6064                 SCTP_BUF_LEN(m) += padding_len;
6065                 padding_len = 0;
6066         }
6067
6068         /* tack on the operational error if present */
6069         if (op_err) {
6070                 parameter_len = 0;
6071                 for (m_tmp = op_err; m_tmp != NULL; m_tmp = SCTP_BUF_NEXT(m_tmp)) {
6072                         parameter_len += SCTP_BUF_LEN(m_tmp);
6073                 }
6074                 padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
6075                 SCTP_BUF_NEXT(m_last) = op_err;
6076                 while (SCTP_BUF_NEXT(m_last) != NULL) {
6077                         m_last = SCTP_BUF_NEXT(m_last);
6078                 }
6079                 chunk_len += parameter_len;
6080         }
6081         if (padding_len > 0) {
6082                 m_last = sctp_add_pad_tombuf(m_last, padding_len);
6083                 if (m_last == NULL) {
6084                         /* Houston we have a problem, no space */
6085                         sctp_m_freem(m);
6086                         return;
6087                 }
6088                 chunk_len += padding_len;
6089                 padding_len = 0;
6090         }
6091         /* Now we must build a cookie */
6092         m_cookie = sctp_add_cookie(init_pkt, offset, m, 0, &stc, &signature);
6093         if (m_cookie == NULL) {
6094                 /* memory problem */
6095                 sctp_m_freem(m);
6096                 return;
6097         }
6098         /* Now append the cookie to the end and update the space/size */
6099         SCTP_BUF_NEXT(m_last) = m_cookie;
6100         parameter_len = 0;
6101         for (m_tmp = m_cookie; m_tmp != NULL; m_tmp = SCTP_BUF_NEXT(m_tmp)) {
6102                 parameter_len += SCTP_BUF_LEN(m_tmp);
6103                 if (SCTP_BUF_NEXT(m_tmp) == NULL) {
6104                         m_last = m_tmp;
6105                 }
6106         }
6107         padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
6108         chunk_len += parameter_len;
6109
6110         /*
6111          * Place in the size, but we don't include the last pad (if any) in
6112          * the INIT-ACK.
6113          */
6114         initack->ch.chunk_length = htons(chunk_len);
6115
6116         /*
6117          * Time to sign the cookie, we don't sign over the cookie signature
6118          * though thus we set trailer.
6119          */
6120         (void)sctp_hmac_m(SCTP_HMAC,
6121             (uint8_t *) inp->sctp_ep.secret_key[(int)(inp->sctp_ep.current_secret_number)],
6122             SCTP_SECRET_SIZE, m_cookie, sizeof(struct sctp_paramhdr),
6123             (uint8_t *) signature, SCTP_SIGNATURE_SIZE);
6124         /*
6125          * We sifa 0 here to NOT set IP_DF if its IPv4, we ignore the return
6126          * here since the timer will drive a retranmission.
6127          */
6128         if (padding_len > 0) {
6129                 if (sctp_add_pad_tombuf(m_last, padding_len) == NULL) {
6130                         sctp_m_freem(m);
6131                         return;
6132                 }
6133         }
6134         if (stc.loopback_scope) {
6135                 over_addr = (union sctp_sockstore *)dst;
6136         } else {
6137                 over_addr = NULL;
6138         }
6139
6140         if ((error = sctp_lowlevel_chunk_output(inp, NULL, NULL, to, m, 0, NULL, 0, 0,
6141             0, 0,
6142             inp->sctp_lport, sh->src_port, init_chk->init.initiate_tag,
6143             port, over_addr,
6144             mflowtype, mflowid,
6145             SCTP_SO_NOT_LOCKED))) {
6146                 SCTPDBG(SCTP_DEBUG_OUTPUT4, "Gak send error %d\n", error);
6147                 if (error == ENOBUFS) {
6148                         if (asoc != NULL) {
6149                                 asoc->ifp_had_enobuf = 1;
6150                         }
6151                         SCTP_STAT_INCR(sctps_lowlevelerr);
6152                 }
6153         } else {
6154                 if (asoc != NULL) {
6155                         asoc->ifp_had_enobuf = 0;
6156                 }
6157         }
6158         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
6159 }
6160
6161
6162 static void
6163 sctp_prune_prsctp(struct sctp_tcb *stcb,
6164     struct sctp_association *asoc,
6165     struct sctp_sndrcvinfo *srcv,
6166     int dataout)
6167 {
6168         int freed_spc = 0;
6169         struct sctp_tmit_chunk *chk, *nchk;
6170
6171         SCTP_TCB_LOCK_ASSERT(stcb);
6172         if ((asoc->prsctp_supported) &&
6173             (asoc->sent_queue_cnt_removeable > 0)) {
6174                 TAILQ_FOREACH(chk, &asoc->sent_queue, sctp_next) {
6175                         /*
6176                          * Look for chunks marked with the PR_SCTP flag AND
6177                          * the buffer space flag. If the one being sent is
6178                          * equal or greater priority then purge the old one
6179                          * and free some space.
6180                          */
6181                         if (PR_SCTP_BUF_ENABLED(chk->flags)) {
6182                                 /*
6183                                  * This one is PR-SCTP AND buffer space
6184                                  * limited type
6185                                  */
6186                                 if (chk->rec.data.timetodrop.tv_sec >= (long)srcv->sinfo_timetolive) {
6187                                         /*
6188                                          * Lower numbers equates to higher
6189                                          * priority so if the one we are
6190                                          * looking at has a larger or equal
6191                                          * priority we want to drop the data
6192                                          * and NOT retransmit it.
6193                                          */
6194                                         if (chk->data) {
6195                                                 /*
6196                                                  * We release the book_size
6197                                                  * if the mbuf is here
6198                                                  */
6199                                                 int ret_spc;
6200                                                 uint8_t sent;
6201
6202                                                 if (chk->sent > SCTP_DATAGRAM_UNSENT)
6203                                                         sent = 1;
6204                                                 else
6205                                                         sent = 0;
6206                                                 ret_spc = sctp_release_pr_sctp_chunk(stcb, chk,
6207                                                     sent,
6208                                                     SCTP_SO_LOCKED);
6209                                                 freed_spc += ret_spc;
6210                                                 if (freed_spc >= dataout) {
6211                                                         return;
6212                                                 }
6213                                         }       /* if chunk was present */
6214                                 }       /* if of sufficient priority */
6215                         }       /* if chunk has enabled */
6216                 }               /* tailqforeach */
6217
6218                 TAILQ_FOREACH_SAFE(chk, &asoc->send_queue, sctp_next, nchk) {
6219                         /* Here we must move to the sent queue and mark */
6220                         if (PR_SCTP_BUF_ENABLED(chk->flags)) {
6221                                 if (chk->rec.data.timetodrop.tv_sec >= (long)srcv->sinfo_timetolive) {
6222                                         if (chk->data) {
6223                                                 /*
6224                                                  * We release the book_size
6225                                                  * if the mbuf is here
6226                                                  */
6227                                                 int ret_spc;
6228
6229                                                 ret_spc = sctp_release_pr_sctp_chunk(stcb, chk,
6230                                                     0, SCTP_SO_LOCKED);
6231
6232                                                 freed_spc += ret_spc;
6233                                                 if (freed_spc >= dataout) {
6234                                                         return;
6235                                                 }
6236                                         }       /* end if chk->data */
6237                                 }       /* end if right class */
6238                         }       /* end if chk pr-sctp */
6239                 }               /* tailqforeachsafe (chk) */
6240         }                       /* if enabled in asoc */
6241 }
6242
6243 int
6244 sctp_get_frag_point(struct sctp_tcb *stcb,
6245     struct sctp_association *asoc)
6246 {
6247         int siz, ovh;
6248
6249         /*
6250          * For endpoints that have both v6 and v4 addresses we must reserve
6251          * room for the ipv6 header, for those that are only dealing with V4
6252          * we use a larger frag point.
6253          */
6254         if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
6255                 ovh = SCTP_MIN_OVERHEAD;
6256         } else {
6257                 ovh = SCTP_MIN_V4_OVERHEAD;
6258         }
6259         ovh += SCTP_DATA_CHUNK_OVERHEAD(stcb);
6260         if (stcb->asoc.sctp_frag_point > asoc->smallest_mtu)
6261                 siz = asoc->smallest_mtu - ovh;
6262         else
6263                 siz = (stcb->asoc.sctp_frag_point - ovh);
6264         /*
6265          * if (siz > (MCLBYTES-sizeof(struct sctp_data_chunk))) {
6266          */
6267         /* A data chunk MUST fit in a cluster */
6268         /* siz = (MCLBYTES - sizeof(struct sctp_data_chunk)); */
6269         /* } */
6270
6271         /* adjust for an AUTH chunk if DATA requires auth */
6272         if (sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks))
6273                 siz -= sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
6274
6275         if (siz % 4) {
6276                 /* make it an even word boundary please */
6277                 siz -= (siz % 4);
6278         }
6279         return (siz);
6280 }
6281
6282 static void
6283 sctp_set_prsctp_policy(struct sctp_stream_queue_pending *sp)
6284 {
6285         /*
6286          * We assume that the user wants PR_SCTP_TTL if the user provides a
6287          * positive lifetime but does not specify any PR_SCTP policy.
6288          */
6289         if (PR_SCTP_ENABLED(sp->sinfo_flags)) {
6290                 sp->act_flags |= PR_SCTP_POLICY(sp->sinfo_flags);
6291         } else if (sp->timetolive > 0) {
6292                 sp->sinfo_flags |= SCTP_PR_SCTP_TTL;
6293                 sp->act_flags |= PR_SCTP_POLICY(sp->sinfo_flags);
6294         } else {
6295                 return;
6296         }
6297         switch (PR_SCTP_POLICY(sp->sinfo_flags)) {
6298         case CHUNK_FLAGS_PR_SCTP_BUF:
6299                 /*
6300                  * Time to live is a priority stored in tv_sec when doing
6301                  * the buffer drop thing.
6302                  */
6303                 sp->ts.tv_sec = sp->timetolive;
6304                 sp->ts.tv_usec = 0;
6305                 break;
6306         case CHUNK_FLAGS_PR_SCTP_TTL:
6307                 {
6308                         struct timeval tv;
6309
6310                         (void)SCTP_GETTIME_TIMEVAL(&sp->ts);
6311                         tv.tv_sec = sp->timetolive / 1000;
6312                         tv.tv_usec = (sp->timetolive * 1000) % 1000000;
6313                         /*
6314                          * TODO sctp_constants.h needs alternative time
6315                          * macros when _KERNEL is undefined.
6316                          */
6317                         timevaladd(&sp->ts, &tv);
6318                 }
6319                 break;
6320         case CHUNK_FLAGS_PR_SCTP_RTX:
6321                 /*
6322                  * Time to live is a the number or retransmissions stored in
6323                  * tv_sec.
6324                  */
6325                 sp->ts.tv_sec = sp->timetolive;
6326                 sp->ts.tv_usec = 0;
6327                 break;
6328         default:
6329                 SCTPDBG(SCTP_DEBUG_USRREQ1,
6330                     "Unknown PR_SCTP policy %u.\n",
6331                     PR_SCTP_POLICY(sp->sinfo_flags));
6332                 break;
6333         }
6334 }
6335
6336 static int
6337 sctp_msg_append(struct sctp_tcb *stcb,
6338     struct sctp_nets *net,
6339     struct mbuf *m,
6340     struct sctp_sndrcvinfo *srcv, int hold_stcb_lock)
6341 {
6342         int error = 0;
6343         struct mbuf *at;
6344         struct sctp_stream_queue_pending *sp = NULL;
6345         struct sctp_stream_out *strm;
6346
6347         /*
6348          * Given an mbuf chain, put it into the association send queue and
6349          * place it on the wheel
6350          */
6351         if (srcv->sinfo_stream >= stcb->asoc.streamoutcnt) {
6352                 /* Invalid stream number */
6353                 SCTP_LTRACE_ERR_RET_PKT(m, NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
6354                 error = EINVAL;
6355                 goto out_now;
6356         }
6357         if ((stcb->asoc.stream_locked) &&
6358             (stcb->asoc.stream_locked_on != srcv->sinfo_stream)) {
6359                 SCTP_LTRACE_ERR_RET_PKT(m, NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
6360                 error = EINVAL;
6361                 goto out_now;
6362         }
6363         strm = &stcb->asoc.strmout[srcv->sinfo_stream];
6364         /* Now can we send this? */
6365         if ((SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_SENT) ||
6366             (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) ||
6367             (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_RECEIVED) ||
6368             (stcb->asoc.state & SCTP_STATE_SHUTDOWN_PENDING)) {
6369                 /* got data while shutting down */
6370                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
6371                 error = ECONNRESET;
6372                 goto out_now;
6373         }
6374         sctp_alloc_a_strmoq(stcb, sp);
6375         if (sp == NULL) {
6376                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
6377                 error = ENOMEM;
6378                 goto out_now;
6379         }
6380         sp->sinfo_flags = srcv->sinfo_flags;
6381         sp->timetolive = srcv->sinfo_timetolive;
6382         sp->ppid = srcv->sinfo_ppid;
6383         sp->context = srcv->sinfo_context;
6384         sp->fsn = 0;
6385         if (sp->sinfo_flags & SCTP_ADDR_OVER) {
6386                 sp->net = net;
6387                 atomic_add_int(&sp->net->ref_count, 1);
6388         } else {
6389                 sp->net = NULL;
6390         }
6391         (void)SCTP_GETTIME_TIMEVAL(&sp->ts);
6392         sp->sid = srcv->sinfo_stream;
6393         sp->msg_is_complete = 1;
6394         sp->sender_all_done = 1;
6395         sp->some_taken = 0;
6396         sp->data = m;
6397         sp->tail_mbuf = NULL;
6398         sctp_set_prsctp_policy(sp);
6399         /*
6400          * We could in theory (for sendall) sifa the length in, but we would
6401          * still have to hunt through the chain since we need to setup the
6402          * tail_mbuf
6403          */
6404         sp->length = 0;
6405         for (at = m; at; at = SCTP_BUF_NEXT(at)) {
6406                 if (SCTP_BUF_NEXT(at) == NULL)
6407                         sp->tail_mbuf = at;
6408                 sp->length += SCTP_BUF_LEN(at);
6409         }
6410         if (srcv->sinfo_keynumber_valid) {
6411                 sp->auth_keyid = srcv->sinfo_keynumber;
6412         } else {
6413                 sp->auth_keyid = stcb->asoc.authinfo.active_keyid;
6414         }
6415         if (sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks)) {
6416                 sctp_auth_key_acquire(stcb, sp->auth_keyid);
6417                 sp->holds_key_ref = 1;
6418         }
6419         if (hold_stcb_lock == 0) {
6420                 SCTP_TCB_SEND_LOCK(stcb);
6421         }
6422         sctp_snd_sb_alloc(stcb, sp->length);
6423         atomic_add_int(&stcb->asoc.stream_queue_cnt, 1);
6424         TAILQ_INSERT_TAIL(&strm->outqueue, sp, next);
6425         stcb->asoc.ss_functions.sctp_ss_add_to_stream(stcb, &stcb->asoc, strm, sp, 1);
6426         m = NULL;
6427         if (hold_stcb_lock == 0) {
6428                 SCTP_TCB_SEND_UNLOCK(stcb);
6429         }
6430 out_now:
6431         if (m) {
6432                 sctp_m_freem(m);
6433         }
6434         return (error);
6435 }
6436
6437
6438 static struct mbuf *
6439 sctp_copy_mbufchain(struct mbuf *clonechain,
6440     struct mbuf *outchain,
6441     struct mbuf **endofchain,
6442     int can_take_mbuf,
6443     int sizeofcpy,
6444     uint8_t copy_by_ref)
6445 {
6446         struct mbuf *m;
6447         struct mbuf *appendchain;
6448         caddr_t cp;
6449         int len;
6450
6451         if (endofchain == NULL) {
6452                 /* error */
6453 error_out:
6454                 if (outchain)
6455                         sctp_m_freem(outchain);
6456                 return (NULL);
6457         }
6458         if (can_take_mbuf) {
6459                 appendchain = clonechain;
6460         } else {
6461                 if (!copy_by_ref &&
6462                     (sizeofcpy <= (int)((((SCTP_BASE_SYSCTL(sctp_mbuf_threshold_count) - 1) * MLEN) + MHLEN)))
6463                     ) {
6464                         /* Its not in a cluster */
6465                         if (*endofchain == NULL) {
6466                                 /* lets get a mbuf cluster */
6467                                 if (outchain == NULL) {
6468                                         /* This is the general case */
6469                         new_mbuf:
6470                                         outchain = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_HEADER);
6471                                         if (outchain == NULL) {
6472                                                 goto error_out;
6473                                         }
6474                                         SCTP_BUF_LEN(outchain) = 0;
6475                                         *endofchain = outchain;
6476                                         /* get the prepend space */
6477                                         SCTP_BUF_RESV_UF(outchain, (SCTP_FIRST_MBUF_RESV + 4));
6478                                 } else {
6479                                         /*
6480                                          * We really should not get a NULL
6481                                          * in endofchain
6482                                          */
6483                                         /* find end */
6484                                         m = outchain;
6485                                         while (m) {
6486                                                 if (SCTP_BUF_NEXT(m) == NULL) {
6487                                                         *endofchain = m;
6488                                                         break;
6489                                                 }
6490                                                 m = SCTP_BUF_NEXT(m);
6491                                         }
6492                                         /* sanity */
6493                                         if (*endofchain == NULL) {
6494                                                 /*
6495                                                  * huh, TSNH XXX maybe we
6496                                                  * should panic
6497                                                  */
6498                                                 sctp_m_freem(outchain);
6499                                                 goto new_mbuf;
6500                                         }
6501                                 }
6502                                 /* get the new end of length */
6503                                 len = (int)M_TRAILINGSPACE(*endofchain);
6504                         } else {
6505                                 /* how much is left at the end? */
6506                                 len = (int)M_TRAILINGSPACE(*endofchain);
6507                         }
6508                         /* Find the end of the data, for appending */
6509                         cp = (mtod((*endofchain), caddr_t)+SCTP_BUF_LEN((*endofchain)));
6510
6511                         /* Now lets copy it out */
6512                         if (len >= sizeofcpy) {
6513                                 /* It all fits, copy it in */
6514                                 m_copydata(clonechain, 0, sizeofcpy, cp);
6515                                 SCTP_BUF_LEN((*endofchain)) += sizeofcpy;
6516                         } else {
6517                                 /* fill up the end of the chain */
6518                                 if (len > 0) {
6519                                         m_copydata(clonechain, 0, len, cp);
6520                                         SCTP_BUF_LEN((*endofchain)) += len;
6521                                         /* now we need another one */
6522                                         sizeofcpy -= len;
6523                                 }
6524                                 m = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_HEADER);
6525                                 if (m == NULL) {
6526                                         /* We failed */
6527                                         goto error_out;
6528                                 }
6529                                 SCTP_BUF_NEXT((*endofchain)) = m;
6530                                 *endofchain = m;
6531                                 cp = mtod((*endofchain), caddr_t);
6532                                 m_copydata(clonechain, len, sizeofcpy, cp);
6533                                 SCTP_BUF_LEN((*endofchain)) += sizeofcpy;
6534                         }
6535                         return (outchain);
6536                 } else {
6537                         /* copy the old fashion way */
6538                         appendchain = SCTP_M_COPYM(clonechain, 0, M_COPYALL, M_NOWAIT);
6539 #ifdef SCTP_MBUF_LOGGING
6540                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
6541                                 sctp_log_mbc(appendchain, SCTP_MBUF_ICOPY);
6542                         }
6543 #endif
6544                 }
6545         }
6546         if (appendchain == NULL) {
6547                 /* error */
6548                 if (outchain)
6549                         sctp_m_freem(outchain);
6550                 return (NULL);
6551         }
6552         if (outchain) {
6553                 /* tack on to the end */
6554                 if (*endofchain != NULL) {
6555                         SCTP_BUF_NEXT(((*endofchain))) = appendchain;
6556                 } else {
6557                         m = outchain;
6558                         while (m) {
6559                                 if (SCTP_BUF_NEXT(m) == NULL) {
6560                                         SCTP_BUF_NEXT(m) = appendchain;
6561                                         break;
6562                                 }
6563                                 m = SCTP_BUF_NEXT(m);
6564                         }
6565                 }
6566                 /*
6567                  * save off the end and update the end-chain position
6568                  */
6569                 m = appendchain;
6570                 while (m) {
6571                         if (SCTP_BUF_NEXT(m) == NULL) {
6572                                 *endofchain = m;
6573                                 break;
6574                         }
6575                         m = SCTP_BUF_NEXT(m);
6576                 }
6577                 return (outchain);
6578         } else {
6579                 /* save off the end and update the end-chain position */
6580                 m = appendchain;
6581                 while (m) {
6582                         if (SCTP_BUF_NEXT(m) == NULL) {
6583                                 *endofchain = m;
6584                                 break;
6585                         }
6586                         m = SCTP_BUF_NEXT(m);
6587                 }
6588                 return (appendchain);
6589         }
6590 }
6591
6592 static int
6593 sctp_med_chunk_output(struct sctp_inpcb *inp,
6594     struct sctp_tcb *stcb,
6595     struct sctp_association *asoc,
6596     int *num_out,
6597     int *reason_code,
6598     int control_only, int from_where,
6599     struct timeval *now, int *now_filled, int frag_point, int so_locked
6600 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
6601     SCTP_UNUSED
6602 #endif
6603 );
6604
6605 static void
6606 sctp_sendall_iterator(struct sctp_inpcb *inp, struct sctp_tcb *stcb, void *ptr,
6607     uint32_t val SCTP_UNUSED)
6608 {
6609         struct sctp_copy_all *ca;
6610         struct mbuf *m;
6611         int ret = 0;
6612         int added_control = 0;
6613         int un_sent, do_chunk_output = 1;
6614         struct sctp_association *asoc;
6615         struct sctp_nets *net;
6616
6617         ca = (struct sctp_copy_all *)ptr;
6618         if (ca->m == NULL) {
6619                 return;
6620         }
6621         if (ca->inp != inp) {
6622                 /* TSNH */
6623                 return;
6624         }
6625         if (ca->sndlen > 0) {
6626                 m = SCTP_M_COPYM(ca->m, 0, M_COPYALL, M_NOWAIT);
6627                 if (m == NULL) {
6628                         /* can't copy so we are done */
6629                         ca->cnt_failed++;
6630                         return;
6631                 }
6632 #ifdef SCTP_MBUF_LOGGING
6633                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
6634                         sctp_log_mbc(m, SCTP_MBUF_ICOPY);
6635                 }
6636 #endif
6637         } else {
6638                 m = NULL;
6639         }
6640         SCTP_TCB_LOCK_ASSERT(stcb);
6641         if (stcb->asoc.alternate) {
6642                 net = stcb->asoc.alternate;
6643         } else {
6644                 net = stcb->asoc.primary_destination;
6645         }
6646         if (ca->sndrcv.sinfo_flags & SCTP_ABORT) {
6647                 /* Abort this assoc with m as the user defined reason */
6648                 if (m != NULL) {
6649                         SCTP_BUF_PREPEND(m, sizeof(struct sctp_paramhdr), M_NOWAIT);
6650                 } else {
6651                         m = sctp_get_mbuf_for_msg(sizeof(struct sctp_paramhdr),
6652                             0, M_NOWAIT, 1, MT_DATA);
6653                         SCTP_BUF_LEN(m) = sizeof(struct sctp_paramhdr);
6654                 }
6655                 if (m != NULL) {
6656                         struct sctp_paramhdr *ph;
6657
6658                         ph = mtod(m, struct sctp_paramhdr *);
6659                         ph->param_type = htons(SCTP_CAUSE_USER_INITIATED_ABT);
6660                         ph->param_length = htons((uint16_t) (sizeof(struct sctp_paramhdr) + ca->sndlen));
6661                 }
6662                 /*
6663                  * We add one here to keep the assoc from dis-appearing on
6664                  * us.
6665                  */
6666                 atomic_add_int(&stcb->asoc.refcnt, 1);
6667                 sctp_abort_an_association(inp, stcb, m, SCTP_SO_NOT_LOCKED);
6668                 /*
6669                  * sctp_abort_an_association calls sctp_free_asoc() free
6670                  * association will NOT free it since we incremented the
6671                  * refcnt .. we do this to prevent it being freed and things
6672                  * getting tricky since we could end up (from free_asoc)
6673                  * calling inpcb_free which would get a recursive lock call
6674                  * to the iterator lock.. But as a consequence of that the
6675                  * stcb will return to us un-locked.. since free_asoc
6676                  * returns with either no TCB or the TCB unlocked, we must
6677                  * relock.. to unlock in the iterator timer :-0
6678                  */
6679                 SCTP_TCB_LOCK(stcb);
6680                 atomic_add_int(&stcb->asoc.refcnt, -1);
6681                 goto no_chunk_output;
6682         } else {
6683                 if (m) {
6684                         ret = sctp_msg_append(stcb, net, m,
6685                             &ca->sndrcv, 1);
6686                 }
6687                 asoc = &stcb->asoc;
6688                 if (ca->sndrcv.sinfo_flags & SCTP_EOF) {
6689                         /* shutdown this assoc */
6690                         if (TAILQ_EMPTY(&asoc->send_queue) &&
6691                             TAILQ_EMPTY(&asoc->sent_queue) &&
6692                             sctp_is_there_unsent_data(stcb, SCTP_SO_NOT_LOCKED) == 0) {
6693                                 if ((*asoc->ss_functions.sctp_ss_is_user_msgs_incomplete) (stcb, asoc)) {
6694                                         goto abort_anyway;
6695                                 }
6696                                 /*
6697                                  * there is nothing queued to send, so I'm
6698                                  * done...
6699                                  */
6700                                 if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) &&
6701                                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
6702                                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
6703                                         /*
6704                                          * only send SHUTDOWN the first time
6705                                          * through
6706                                          */
6707                                         if (SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) {
6708                                                 SCTP_STAT_DECR_GAUGE32(sctps_currestab);
6709                                         }
6710                                         SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_SENT);
6711                                         SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING);
6712                                         sctp_stop_timers_for_shutdown(stcb);
6713                                         sctp_send_shutdown(stcb, net);
6714                                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb,
6715                                             net);
6716                                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
6717                                             asoc->primary_destination);
6718                                         added_control = 1;
6719                                         do_chunk_output = 0;
6720                                 }
6721                         } else {
6722                                 /*
6723                                  * we still got (or just got) data to send,
6724                                  * so set SHUTDOWN_PENDING
6725                                  */
6726                                 /*
6727                                  * XXX sockets draft says that SCTP_EOF
6728                                  * should be sent with no data.  currently,
6729                                  * we will allow user data to be sent first
6730                                  * and move to SHUTDOWN-PENDING
6731                                  */
6732                                 if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) &&
6733                                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
6734                                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
6735                                         if ((*asoc->ss_functions.sctp_ss_is_user_msgs_incomplete) (stcb, asoc)) {
6736                                                 asoc->state |= SCTP_STATE_PARTIAL_MSG_LEFT;
6737                                         }
6738                                         asoc->state |= SCTP_STATE_SHUTDOWN_PENDING;
6739                                         if (TAILQ_EMPTY(&asoc->send_queue) &&
6740                                             TAILQ_EMPTY(&asoc->sent_queue) &&
6741                                             (asoc->state & SCTP_STATE_PARTIAL_MSG_LEFT)) {
6742                                                 struct mbuf *op_err;
6743                                                 char msg[SCTP_DIAG_INFO_LEN];
6744
6745                                 abort_anyway:
6746                                                 snprintf(msg, sizeof(msg),
6747                                                     "%s:%d at %s", __FILE__, __LINE__, __func__);
6748                                                 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
6749                                                     msg);
6750                                                 atomic_add_int(&stcb->asoc.refcnt, 1);
6751                                                 sctp_abort_an_association(stcb->sctp_ep, stcb,
6752                                                     op_err, SCTP_SO_NOT_LOCKED);
6753                                                 atomic_add_int(&stcb->asoc.refcnt, -1);
6754                                                 goto no_chunk_output;
6755                                         }
6756                                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
6757                                             asoc->primary_destination);
6758                                 }
6759                         }
6760
6761                 }
6762         }
6763         un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
6764             (stcb->asoc.stream_queue_cnt * SCTP_DATA_CHUNK_OVERHEAD(stcb)));
6765
6766         if ((sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY)) &&
6767             (stcb->asoc.total_flight > 0) &&
6768             (un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD))) {
6769                 do_chunk_output = 0;
6770         }
6771         if (do_chunk_output)
6772                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_NOT_LOCKED);
6773         else if (added_control) {
6774                 int num_out, reason, now_filled = 0;
6775                 struct timeval now;
6776                 int frag_point;
6777
6778                 frag_point = sctp_get_frag_point(stcb, &stcb->asoc);
6779                 (void)sctp_med_chunk_output(inp, stcb, &stcb->asoc, &num_out,
6780                     &reason, 1, 1, &now, &now_filled, frag_point, SCTP_SO_NOT_LOCKED);
6781         }
6782 no_chunk_output:
6783         if (ret) {
6784                 ca->cnt_failed++;
6785         } else {
6786                 ca->cnt_sent++;
6787         }
6788 }
6789
6790 static void
6791 sctp_sendall_completes(void *ptr, uint32_t val SCTP_UNUSED)
6792 {
6793         struct sctp_copy_all *ca;
6794
6795         ca = (struct sctp_copy_all *)ptr;
6796         /*
6797          * Do a notify here? Kacheong suggests that the notify be done at
6798          * the send time.. so you would push up a notification if any send
6799          * failed. Don't know if this is feasible since the only failures we
6800          * have is "memory" related and if you cannot get an mbuf to send
6801          * the data you surely can't get an mbuf to send up to notify the
6802          * user you can't send the data :->
6803          */
6804
6805         /* now free everything */
6806         sctp_m_freem(ca->m);
6807         SCTP_FREE(ca, SCTP_M_COPYAL);
6808 }
6809
6810 static struct mbuf *
6811 sctp_copy_out_all(struct uio *uio, int len)
6812 {
6813         struct mbuf *ret, *at;
6814         int left, willcpy, cancpy, error;
6815
6816         ret = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_WAITOK, 1, MT_DATA);
6817         if (ret == NULL) {
6818                 /* TSNH */
6819                 return (NULL);
6820         }
6821         left = len;
6822         SCTP_BUF_LEN(ret) = 0;
6823         /* save space for the data chunk header */
6824         cancpy = (int)M_TRAILINGSPACE(ret);
6825         willcpy = min(cancpy, left);
6826         at = ret;
6827         while (left > 0) {
6828                 /* Align data to the end */
6829                 error = uiomove(mtod(at, caddr_t), willcpy, uio);
6830                 if (error) {
6831         err_out_now:
6832                         sctp_m_freem(at);
6833                         return (NULL);
6834                 }
6835                 SCTP_BUF_LEN(at) = willcpy;
6836                 SCTP_BUF_NEXT_PKT(at) = SCTP_BUF_NEXT(at) = 0;
6837                 left -= willcpy;
6838                 if (left > 0) {
6839                         SCTP_BUF_NEXT(at) = sctp_get_mbuf_for_msg(left, 0, M_WAITOK, 1, MT_DATA);
6840                         if (SCTP_BUF_NEXT(at) == NULL) {
6841                                 goto err_out_now;
6842                         }
6843                         at = SCTP_BUF_NEXT(at);
6844                         SCTP_BUF_LEN(at) = 0;
6845                         cancpy = (int)M_TRAILINGSPACE(at);
6846                         willcpy = min(cancpy, left);
6847                 }
6848         }
6849         return (ret);
6850 }
6851
6852 static int
6853 sctp_sendall(struct sctp_inpcb *inp, struct uio *uio, struct mbuf *m,
6854     struct sctp_sndrcvinfo *srcv)
6855 {
6856         int ret;
6857         struct sctp_copy_all *ca;
6858
6859         SCTP_MALLOC(ca, struct sctp_copy_all *, sizeof(struct sctp_copy_all),
6860             SCTP_M_COPYAL);
6861         if (ca == NULL) {
6862                 sctp_m_freem(m);
6863                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
6864                 return (ENOMEM);
6865         }
6866         memset(ca, 0, sizeof(struct sctp_copy_all));
6867
6868         ca->inp = inp;
6869         if (srcv) {
6870                 memcpy(&ca->sndrcv, srcv, sizeof(struct sctp_nonpad_sndrcvinfo));
6871         }
6872         /*
6873          * take off the sendall flag, it would be bad if we failed to do
6874          * this :-0
6875          */
6876         ca->sndrcv.sinfo_flags &= ~SCTP_SENDALL;
6877         /* get length and mbuf chain */
6878         if (uio) {
6879                 ca->sndlen = (int)uio->uio_resid;
6880                 ca->m = sctp_copy_out_all(uio, ca->sndlen);
6881                 if (ca->m == NULL) {
6882                         SCTP_FREE(ca, SCTP_M_COPYAL);
6883                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
6884                         return (ENOMEM);
6885                 }
6886         } else {
6887                 /* Gather the length of the send */
6888                 struct mbuf *mat;
6889
6890                 ca->sndlen = 0;
6891                 for (mat = m; mat; mat = SCTP_BUF_NEXT(mat)) {
6892                         ca->sndlen += SCTP_BUF_LEN(mat);
6893                 }
6894         }
6895         ret = sctp_initiate_iterator(NULL, sctp_sendall_iterator, NULL,
6896             SCTP_PCB_ANY_FLAGS, SCTP_PCB_ANY_FEATURES,
6897             SCTP_ASOC_ANY_STATE,
6898             (void *)ca, 0,
6899             sctp_sendall_completes, inp, 1);
6900         if (ret) {
6901                 SCTP_PRINTF("Failed to initiate iterator for sendall\n");
6902                 SCTP_FREE(ca, SCTP_M_COPYAL);
6903                 SCTP_LTRACE_ERR_RET_PKT(m, inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EFAULT);
6904                 return (EFAULT);
6905         }
6906         return (0);
6907 }
6908
6909
6910 void
6911 sctp_toss_old_cookies(struct sctp_tcb *stcb, struct sctp_association *asoc)
6912 {
6913         struct sctp_tmit_chunk *chk, *nchk;
6914
6915         TAILQ_FOREACH_SAFE(chk, &asoc->control_send_queue, sctp_next, nchk) {
6916                 if (chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
6917                         TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
6918                         asoc->ctrl_queue_cnt--;
6919                         if (chk->data) {
6920                                 sctp_m_freem(chk->data);
6921                                 chk->data = NULL;
6922                         }
6923                         sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
6924                 }
6925         }
6926 }
6927
6928 void
6929 sctp_toss_old_asconf(struct sctp_tcb *stcb)
6930 {
6931         struct sctp_association *asoc;
6932         struct sctp_tmit_chunk *chk, *nchk;
6933         struct sctp_asconf_chunk *acp;
6934
6935         asoc = &stcb->asoc;
6936         TAILQ_FOREACH_SAFE(chk, &asoc->asconf_send_queue, sctp_next, nchk) {
6937                 /* find SCTP_ASCONF chunk in queue */
6938                 if (chk->rec.chunk_id.id == SCTP_ASCONF) {
6939                         if (chk->data) {
6940                                 acp = mtod(chk->data, struct sctp_asconf_chunk *);
6941                                 if (SCTP_TSN_GT(ntohl(acp->serial_number), asoc->asconf_seq_out_acked)) {
6942                                         /* Not Acked yet */
6943                                         break;
6944                                 }
6945                         }
6946                         TAILQ_REMOVE(&asoc->asconf_send_queue, chk, sctp_next);
6947                         asoc->ctrl_queue_cnt--;
6948                         if (chk->data) {
6949                                 sctp_m_freem(chk->data);
6950                                 chk->data = NULL;
6951                         }
6952                         sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
6953                 }
6954         }
6955 }
6956
6957
6958 static void
6959 sctp_clean_up_datalist(struct sctp_tcb *stcb,
6960     struct sctp_association *asoc,
6961     struct sctp_tmit_chunk **data_list,
6962     int bundle_at,
6963     struct sctp_nets *net)
6964 {
6965         int i;
6966         struct sctp_tmit_chunk *tp1;
6967
6968         for (i = 0; i < bundle_at; i++) {
6969                 /* off of the send queue */
6970                 TAILQ_REMOVE(&asoc->send_queue, data_list[i], sctp_next);
6971                 asoc->send_queue_cnt--;
6972                 if (i > 0) {
6973                         /*
6974                          * Any chunk NOT 0 you zap the time chunk 0 gets
6975                          * zapped or set based on if a RTO measurment is
6976                          * needed.
6977                          */
6978                         data_list[i]->do_rtt = 0;
6979                 }
6980                 /* record time */
6981                 data_list[i]->sent_rcv_time = net->last_sent_time;
6982                 data_list[i]->rec.data.cwnd_at_send = net->cwnd;
6983                 data_list[i]->rec.data.fast_retran_tsn = data_list[i]->rec.data.tsn;
6984                 if (data_list[i]->whoTo == NULL) {
6985                         data_list[i]->whoTo = net;
6986                         atomic_add_int(&net->ref_count, 1);
6987                 }
6988                 /* on to the sent queue */
6989                 tp1 = TAILQ_LAST(&asoc->sent_queue, sctpchunk_listhead);
6990                 if ((tp1) && SCTP_TSN_GT(tp1->rec.data.tsn, data_list[i]->rec.data.tsn)) {
6991                         struct sctp_tmit_chunk *tpp;
6992
6993                         /* need to move back */
6994         back_up_more:
6995                         tpp = TAILQ_PREV(tp1, sctpchunk_listhead, sctp_next);
6996                         if (tpp == NULL) {
6997                                 TAILQ_INSERT_BEFORE(tp1, data_list[i], sctp_next);
6998                                 goto all_done;
6999                         }
7000                         tp1 = tpp;
7001                         if (SCTP_TSN_GT(tp1->rec.data.tsn, data_list[i]->rec.data.tsn)) {
7002                                 goto back_up_more;
7003                         }
7004                         TAILQ_INSERT_AFTER(&asoc->sent_queue, tp1, data_list[i], sctp_next);
7005                 } else {
7006                         TAILQ_INSERT_TAIL(&asoc->sent_queue,
7007                             data_list[i],
7008                             sctp_next);
7009                 }
7010 all_done:
7011                 /* This does not lower until the cum-ack passes it */
7012                 asoc->sent_queue_cnt++;
7013                 if ((asoc->peers_rwnd <= 0) &&
7014                     (asoc->total_flight == 0) &&
7015                     (bundle_at == 1)) {
7016                         /* Mark the chunk as being a window probe */
7017                         SCTP_STAT_INCR(sctps_windowprobed);
7018                 }
7019 #ifdef SCTP_AUDITING_ENABLED
7020                 sctp_audit_log(0xC2, 3);
7021 #endif
7022                 data_list[i]->sent = SCTP_DATAGRAM_SENT;
7023                 data_list[i]->snd_count = 1;
7024                 data_list[i]->rec.data.chunk_was_revoked = 0;
7025                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
7026                         sctp_misc_ints(SCTP_FLIGHT_LOG_UP,
7027                             data_list[i]->whoTo->flight_size,
7028                             data_list[i]->book_size,
7029                             (uint32_t) (uintptr_t) data_list[i]->whoTo,
7030                             data_list[i]->rec.data.tsn);
7031                 }
7032                 sctp_flight_size_increase(data_list[i]);
7033                 sctp_total_flight_increase(stcb, data_list[i]);
7034                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_RWND_ENABLE) {
7035                         sctp_log_rwnd(SCTP_DECREASE_PEER_RWND,
7036                             asoc->peers_rwnd, data_list[i]->send_size, SCTP_BASE_SYSCTL(sctp_peer_chunk_oh));
7037                 }
7038                 asoc->peers_rwnd = sctp_sbspace_sub(asoc->peers_rwnd,
7039                     (uint32_t) (data_list[i]->send_size + SCTP_BASE_SYSCTL(sctp_peer_chunk_oh)));
7040                 if (asoc->peers_rwnd < stcb->sctp_ep->sctp_ep.sctp_sws_sender) {
7041                         /* SWS sender side engages */
7042                         asoc->peers_rwnd = 0;
7043                 }
7044         }
7045         if (asoc->cc_functions.sctp_cwnd_update_packet_transmitted) {
7046                 (*asoc->cc_functions.sctp_cwnd_update_packet_transmitted) (stcb, net);
7047         }
7048 }
7049
7050 static void
7051 sctp_clean_up_ctl(struct sctp_tcb *stcb, struct sctp_association *asoc, int so_locked
7052 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
7053     SCTP_UNUSED
7054 #endif
7055 )
7056 {
7057         struct sctp_tmit_chunk *chk, *nchk;
7058
7059         TAILQ_FOREACH_SAFE(chk, &asoc->control_send_queue, sctp_next, nchk) {
7060                 if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
7061                     (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK) ||  /* EY */
7062                     (chk->rec.chunk_id.id == SCTP_HEARTBEAT_REQUEST) ||
7063                     (chk->rec.chunk_id.id == SCTP_HEARTBEAT_ACK) ||
7064                     (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN) ||
7065                     (chk->rec.chunk_id.id == SCTP_SHUTDOWN) ||
7066                     (chk->rec.chunk_id.id == SCTP_SHUTDOWN_ACK) ||
7067                     (chk->rec.chunk_id.id == SCTP_OPERATION_ERROR) ||
7068                     (chk->rec.chunk_id.id == SCTP_PACKET_DROPPED) ||
7069                     (chk->rec.chunk_id.id == SCTP_COOKIE_ACK) ||
7070                     (chk->rec.chunk_id.id == SCTP_ECN_CWR) ||
7071                     (chk->rec.chunk_id.id == SCTP_ASCONF_ACK)) {
7072                         /* Stray chunks must be cleaned up */
7073         clean_up_anyway:
7074                         TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
7075                         asoc->ctrl_queue_cnt--;
7076                         if (chk->data) {
7077                                 sctp_m_freem(chk->data);
7078                                 chk->data = NULL;
7079                         }
7080                         if (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN) {
7081                                 asoc->fwd_tsn_cnt--;
7082                         }
7083                         sctp_free_a_chunk(stcb, chk, so_locked);
7084                 } else if (chk->rec.chunk_id.id == SCTP_STREAM_RESET) {
7085                         /* special handling, we must look into the param */
7086                         if (chk != asoc->str_reset) {
7087                                 goto clean_up_anyway;
7088                         }
7089                 }
7090         }
7091 }
7092
7093 static uint32_t
7094 sctp_can_we_split_this(struct sctp_tcb *stcb, uint32_t length,
7095     uint32_t space_left, uint32_t frag_point, int eeor_on){
7096         /*
7097          * Make a decision on if I should split a msg into multiple parts.
7098          * This is only asked of incomplete messages.
7099          */
7100         if (eeor_on) {
7101                 /*
7102                  * If we are doing EEOR we need to always send it if its the
7103                  * entire thing, since it might be all the guy is putting in
7104                  * the hopper.
7105                  */
7106                 if (space_left >= length) {
7107                         /*-
7108                          * If we have data outstanding,
7109                          * we get another chance when the sack
7110                          * arrives to transmit - wait for more data
7111                          */
7112                         if (stcb->asoc.total_flight == 0) {
7113                                 /*
7114                                  * If nothing is in flight, we zero the
7115                                  * packet counter.
7116                                  */
7117                                 return (length);
7118                         }
7119                         return (0);
7120
7121                 } else {
7122                         /* You can fill the rest */
7123                         return (space_left);
7124                 }
7125         }
7126         /*-
7127          * For those strange folk that make the send buffer
7128          * smaller than our fragmentation point, we can't
7129          * get a full msg in so we have to allow splitting.
7130          */
7131         if (SCTP_SB_LIMIT_SND(stcb->sctp_socket) < frag_point) {
7132                 return (length);
7133         }
7134         if ((length <= space_left) ||
7135             ((length - space_left) < SCTP_BASE_SYSCTL(sctp_min_residual))) {
7136                 /* Sub-optimial residual don't split in non-eeor mode. */
7137                 return (0);
7138         }
7139         /*
7140          * If we reach here length is larger than the space_left. Do we wish
7141          * to split it for the sake of packet putting together?
7142          */
7143         if (space_left >= min(SCTP_BASE_SYSCTL(sctp_min_split_point), frag_point)) {
7144                 /* Its ok to split it */
7145                 return (min(space_left, frag_point));
7146         }
7147         /* Nope, can't split */
7148         return (0);
7149 }
7150
7151 static uint32_t
7152 sctp_move_to_outqueue(struct sctp_tcb *stcb,
7153     struct sctp_stream_out *strq,
7154     uint32_t space_left,
7155     uint32_t frag_point,
7156     int *giveup,
7157     int eeor_mode,
7158     int *bail,
7159     int so_locked
7160 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
7161     SCTP_UNUSED
7162 #endif
7163 ){
7164         /* Move from the stream to the send_queue keeping track of the total */
7165         struct sctp_association *asoc;
7166         struct sctp_stream_queue_pending *sp;
7167         struct sctp_tmit_chunk *chk;
7168         struct sctp_data_chunk *dchkh = NULL;
7169         struct sctp_idata_chunk *ndchkh = NULL;
7170         uint32_t to_move, length;
7171         int leading;
7172         uint8_t rcv_flags = 0;
7173         uint8_t some_taken;
7174         uint8_t send_lock_up = 0;
7175
7176         SCTP_TCB_LOCK_ASSERT(stcb);
7177         asoc = &stcb->asoc;
7178 one_more_time:
7179         /* sa_ignore FREED_MEMORY */
7180         sp = TAILQ_FIRST(&strq->outqueue);
7181         if (sp == NULL) {
7182                 if (send_lock_up == 0) {
7183                         SCTP_TCB_SEND_LOCK(stcb);
7184                         send_lock_up = 1;
7185                 }
7186                 sp = TAILQ_FIRST(&strq->outqueue);
7187                 if (sp) {
7188                         goto one_more_time;
7189                 }
7190                 if ((sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_EXPLICIT_EOR) == 0) &&
7191                     (stcb->asoc.idata_supported == 0) &&
7192                     (strq->last_msg_incomplete)) {
7193                         SCTP_PRINTF("Huh? Stream:%d lm_in_c=%d but queue is NULL\n",
7194                             strq->sid,
7195                             strq->last_msg_incomplete);
7196                         strq->last_msg_incomplete = 0;
7197                 }
7198                 to_move = 0;
7199                 if (send_lock_up) {
7200                         SCTP_TCB_SEND_UNLOCK(stcb);
7201                         send_lock_up = 0;
7202                 }
7203                 goto out_of;
7204         }
7205         if ((sp->msg_is_complete) && (sp->length == 0)) {
7206                 if (sp->sender_all_done) {
7207                         /*
7208                          * We are doing differed cleanup. Last time through
7209                          * when we took all the data the sender_all_done was
7210                          * not set.
7211                          */
7212                         if ((sp->put_last_out == 0) && (sp->discard_rest == 0)) {
7213                                 SCTP_PRINTF("Gak, put out entire msg with NO end!-1\n");
7214                                 SCTP_PRINTF("sender_done:%d len:%d msg_comp:%d put_last_out:%d send_lock:%d\n",
7215                                     sp->sender_all_done,
7216                                     sp->length,
7217                                     sp->msg_is_complete,
7218                                     sp->put_last_out,
7219                                     send_lock_up);
7220                         }
7221                         if ((TAILQ_NEXT(sp, next) == NULL) && (send_lock_up == 0)) {
7222                                 SCTP_TCB_SEND_LOCK(stcb);
7223                                 send_lock_up = 1;
7224                         }
7225                         atomic_subtract_int(&asoc->stream_queue_cnt, 1);
7226                         TAILQ_REMOVE(&strq->outqueue, sp, next);
7227                         stcb->asoc.ss_functions.sctp_ss_remove_from_stream(stcb, asoc, strq, sp, send_lock_up);
7228                         if ((strq->state == SCTP_STREAM_RESET_PENDING) &&
7229                             (strq->chunks_on_queues == 0) &&
7230                             TAILQ_EMPTY(&strq->outqueue)) {
7231                                 stcb->asoc.trigger_reset = 1;
7232                         }
7233                         if (sp->net) {
7234                                 sctp_free_remote_addr(sp->net);
7235                                 sp->net = NULL;
7236                         }
7237                         if (sp->data) {
7238                                 sctp_m_freem(sp->data);
7239                                 sp->data = NULL;
7240                         }
7241                         sctp_free_a_strmoq(stcb, sp, so_locked);
7242                         /* we can't be locked to it */
7243                         if (send_lock_up) {
7244                                 SCTP_TCB_SEND_UNLOCK(stcb);
7245                                 send_lock_up = 0;
7246                         }
7247                         /* back to get the next msg */
7248                         goto one_more_time;
7249                 } else {
7250                         /*
7251                          * sender just finished this but still holds a
7252                          * reference
7253                          */
7254                         *giveup = 1;
7255                         to_move = 0;
7256                         goto out_of;
7257                 }
7258         } else {
7259                 /* is there some to get */
7260                 if (sp->length == 0) {
7261                         /* no */
7262                         *giveup = 1;
7263                         to_move = 0;
7264                         goto out_of;
7265                 } else if (sp->discard_rest) {
7266                         if (send_lock_up == 0) {
7267                                 SCTP_TCB_SEND_LOCK(stcb);
7268                                 send_lock_up = 1;
7269                         }
7270                         /* Whack down the size */
7271                         atomic_subtract_int(&stcb->asoc.total_output_queue_size, sp->length);
7272                         if ((stcb->sctp_socket != NULL) &&
7273                             ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
7274                             (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL))) {
7275                                 atomic_subtract_int(&stcb->sctp_socket->so_snd.sb_cc, sp->length);
7276                         }
7277                         if (sp->data) {
7278                                 sctp_m_freem(sp->data);
7279                                 sp->data = NULL;
7280                                 sp->tail_mbuf = NULL;
7281                         }
7282                         sp->length = 0;
7283                         sp->some_taken = 1;
7284                         *giveup = 1;
7285                         to_move = 0;
7286                         goto out_of;
7287                 }
7288         }
7289         some_taken = sp->some_taken;
7290 re_look:
7291         length = sp->length;
7292         if (sp->msg_is_complete) {
7293                 /* The message is complete */
7294                 to_move = min(length, frag_point);
7295                 if (to_move == length) {
7296                         /* All of it fits in the MTU */
7297                         if (sp->some_taken) {
7298                                 rcv_flags |= SCTP_DATA_LAST_FRAG;
7299                         } else {
7300                                 rcv_flags |= SCTP_DATA_NOT_FRAG;
7301                         }
7302                         sp->put_last_out = 1;
7303                         if (sp->sinfo_flags & SCTP_SACK_IMMEDIATELY) {
7304                                 rcv_flags |= SCTP_DATA_SACK_IMMEDIATELY;
7305                         }
7306                 } else {
7307                         /* Not all of it fits, we fragment */
7308                         if (sp->some_taken == 0) {
7309                                 rcv_flags |= SCTP_DATA_FIRST_FRAG;
7310                         }
7311                         sp->some_taken = 1;
7312                 }
7313         } else {
7314                 to_move = sctp_can_we_split_this(stcb, length, space_left, frag_point, eeor_mode);
7315                 if (to_move) {
7316                         /*-
7317                          * We use a snapshot of length in case it
7318                          * is expanding during the compare.
7319                          */
7320                         uint32_t llen;
7321
7322                         llen = length;
7323                         if (to_move >= llen) {
7324                                 to_move = llen;
7325                                 if (send_lock_up == 0) {
7326                                         /*-
7327                                          * We are taking all of an incomplete msg
7328                                          * thus we need a send lock.
7329                                          */
7330                                         SCTP_TCB_SEND_LOCK(stcb);
7331                                         send_lock_up = 1;
7332                                         if (sp->msg_is_complete) {
7333                                                 /*
7334                                                  * the sender finished the
7335                                                  * msg
7336                                                  */
7337                                                 goto re_look;
7338                                         }
7339                                 }
7340                         }
7341                         if (sp->some_taken == 0) {
7342                                 rcv_flags |= SCTP_DATA_FIRST_FRAG;
7343                                 sp->some_taken = 1;
7344                         }
7345                 } else {
7346                         /* Nothing to take. */
7347                         *giveup = 1;
7348                         to_move = 0;
7349                         goto out_of;
7350                 }
7351         }
7352
7353         /* If we reach here, we can copy out a chunk */
7354         sctp_alloc_a_chunk(stcb, chk);
7355         if (chk == NULL) {
7356                 /* No chunk memory */
7357                 *giveup = 1;
7358                 to_move = 0;
7359                 goto out_of;
7360         }
7361         /*
7362          * Setup for unordered if needed by looking at the user sent info
7363          * flags.
7364          */
7365         if (sp->sinfo_flags & SCTP_UNORDERED) {
7366                 rcv_flags |= SCTP_DATA_UNORDERED;
7367         }
7368         if (SCTP_BASE_SYSCTL(sctp_enable_sack_immediately) &&
7369             (sp->sinfo_flags & SCTP_EOF) == SCTP_EOF) {
7370                 rcv_flags |= SCTP_DATA_SACK_IMMEDIATELY;
7371         }
7372         /* clear out the chunk before setting up */
7373         memset(chk, 0, sizeof(*chk));
7374         chk->rec.data.rcv_flags = rcv_flags;
7375
7376         if (to_move >= length) {
7377                 /* we think we can steal the whole thing */
7378                 if ((sp->sender_all_done == 0) && (send_lock_up == 0)) {
7379                         SCTP_TCB_SEND_LOCK(stcb);
7380                         send_lock_up = 1;
7381                 }
7382                 if (to_move < sp->length) {
7383                         /* bail, it changed */
7384                         goto dont_do_it;
7385                 }
7386                 chk->data = sp->data;
7387                 chk->last_mbuf = sp->tail_mbuf;
7388                 /* register the stealing */
7389                 sp->data = sp->tail_mbuf = NULL;
7390         } else {
7391                 struct mbuf *m;
7392
7393 dont_do_it:
7394                 chk->data = SCTP_M_COPYM(sp->data, 0, to_move, M_NOWAIT);
7395                 chk->last_mbuf = NULL;
7396                 if (chk->data == NULL) {
7397                         sp->some_taken = some_taken;
7398                         sctp_free_a_chunk(stcb, chk, so_locked);
7399                         *bail = 1;
7400                         to_move = 0;
7401                         goto out_of;
7402                 }
7403 #ifdef SCTP_MBUF_LOGGING
7404                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
7405                         sctp_log_mbc(chk->data, SCTP_MBUF_ICOPY);
7406                 }
7407 #endif
7408                 /* Pull off the data */
7409                 m_adj(sp->data, to_move);
7410                 /* Now lets work our way down and compact it */
7411                 m = sp->data;
7412                 while (m && (SCTP_BUF_LEN(m) == 0)) {
7413                         sp->data = SCTP_BUF_NEXT(m);
7414                         SCTP_BUF_NEXT(m) = NULL;
7415                         if (sp->tail_mbuf == m) {
7416                                 /*-
7417                                  * Freeing tail? TSNH since
7418                                  * we supposedly were taking less
7419                                  * than the sp->length.
7420                                  */
7421 #ifdef INVARIANTS
7422                                 panic("Huh, freing tail? - TSNH");
7423 #else
7424                                 SCTP_PRINTF("Huh, freeing tail? - TSNH\n");
7425                                 sp->tail_mbuf = sp->data = NULL;
7426                                 sp->length = 0;
7427 #endif
7428
7429                         }
7430                         sctp_m_free(m);
7431                         m = sp->data;
7432                 }
7433         }
7434         if (SCTP_BUF_IS_EXTENDED(chk->data)) {
7435                 chk->copy_by_ref = 1;
7436         } else {
7437                 chk->copy_by_ref = 0;
7438         }
7439         /*
7440          * get last_mbuf and counts of mb usage This is ugly but hopefully
7441          * its only one mbuf.
7442          */
7443         if (chk->last_mbuf == NULL) {
7444                 chk->last_mbuf = chk->data;
7445                 while (SCTP_BUF_NEXT(chk->last_mbuf) != NULL) {
7446                         chk->last_mbuf = SCTP_BUF_NEXT(chk->last_mbuf);
7447                 }
7448         }
7449
7450         if (to_move > length) {
7451                 /*- This should not happen either
7452                  * since we always lower to_move to the size
7453                  * of sp->length if its larger.
7454                  */
7455 #ifdef INVARIANTS
7456                 panic("Huh, how can to_move be larger?");
7457 #else
7458                 SCTP_PRINTF("Huh, how can to_move be larger?\n");
7459                 sp->length = 0;
7460 #endif
7461         } else {
7462                 atomic_subtract_int(&sp->length, to_move);
7463         }
7464         leading = SCTP_DATA_CHUNK_OVERHEAD(stcb);
7465         if (M_LEADINGSPACE(chk->data) < leading) {
7466                 /* Not enough room for a chunk header, get some */
7467                 struct mbuf *m;
7468
7469                 m = sctp_get_mbuf_for_msg(1, 0, M_NOWAIT, 1, MT_DATA);
7470                 if (m == NULL) {
7471                         /*
7472                          * we're in trouble here. _PREPEND below will free
7473                          * all the data if there is no leading space, so we
7474                          * must put the data back and restore.
7475                          */
7476                         if (send_lock_up == 0) {
7477                                 SCTP_TCB_SEND_LOCK(stcb);
7478                                 send_lock_up = 1;
7479                         }
7480                         if (sp->data == NULL) {
7481                                 /* unsteal the data */
7482                                 sp->data = chk->data;
7483                                 sp->tail_mbuf = chk->last_mbuf;
7484                         } else {
7485                                 struct mbuf *m_tmp;
7486
7487                                 /* reassemble the data */
7488                                 m_tmp = sp->data;
7489                                 sp->data = chk->data;
7490                                 SCTP_BUF_NEXT(chk->last_mbuf) = m_tmp;
7491                         }
7492                         sp->some_taken = some_taken;
7493                         atomic_add_int(&sp->length, to_move);
7494                         chk->data = NULL;
7495                         *bail = 1;
7496                         sctp_free_a_chunk(stcb, chk, so_locked);
7497                         to_move = 0;
7498                         goto out_of;
7499                 } else {
7500                         SCTP_BUF_LEN(m) = 0;
7501                         SCTP_BUF_NEXT(m) = chk->data;
7502                         chk->data = m;
7503                         M_ALIGN(chk->data, 4);
7504                 }
7505         }
7506         SCTP_BUF_PREPEND(chk->data, SCTP_DATA_CHUNK_OVERHEAD(stcb), M_NOWAIT);
7507         if (chk->data == NULL) {
7508                 /* HELP, TSNH since we assured it would not above? */
7509 #ifdef INVARIANTS
7510                 panic("prepend failes HELP?");
7511 #else
7512                 SCTP_PRINTF("prepend fails HELP?\n");
7513                 sctp_free_a_chunk(stcb, chk, so_locked);
7514 #endif
7515                 *bail = 1;
7516                 to_move = 0;
7517                 goto out_of;
7518         }
7519         sctp_snd_sb_alloc(stcb, SCTP_DATA_CHUNK_OVERHEAD(stcb));
7520         chk->book_size = chk->send_size = (uint16_t) (to_move + SCTP_DATA_CHUNK_OVERHEAD(stcb));
7521         chk->book_size_scale = 0;
7522         chk->sent = SCTP_DATAGRAM_UNSENT;
7523
7524         chk->flags = 0;
7525         chk->asoc = &stcb->asoc;
7526         chk->pad_inplace = 0;
7527         chk->no_fr_allowed = 0;
7528         if (stcb->asoc.idata_supported == 0) {
7529                 if (rcv_flags & SCTP_DATA_UNORDERED) {
7530                         /* Just use 0. The receiver ignores the values. */
7531                         chk->rec.data.mid = 0;
7532                 } else {
7533                         chk->rec.data.mid = strq->next_mid_ordered;
7534                         if (rcv_flags & SCTP_DATA_LAST_FRAG) {
7535                                 strq->next_mid_ordered++;
7536                         }
7537                 }
7538         } else {
7539                 if (rcv_flags & SCTP_DATA_UNORDERED) {
7540                         chk->rec.data.mid = strq->next_mid_unordered;
7541                         if (rcv_flags & SCTP_DATA_LAST_FRAG) {
7542                                 strq->next_mid_unordered++;
7543                         }
7544                 } else {
7545                         chk->rec.data.mid = strq->next_mid_ordered;
7546                         if (rcv_flags & SCTP_DATA_LAST_FRAG) {
7547                                 strq->next_mid_ordered++;
7548                         }
7549                 }
7550         }
7551         chk->rec.data.sid = sp->sid;
7552         chk->rec.data.ppid = sp->ppid;
7553         chk->rec.data.context = sp->context;
7554         chk->rec.data.doing_fast_retransmit = 0;
7555
7556         chk->rec.data.timetodrop = sp->ts;
7557         chk->flags = sp->act_flags;
7558
7559         if (sp->net) {
7560                 chk->whoTo = sp->net;
7561                 atomic_add_int(&chk->whoTo->ref_count, 1);
7562         } else
7563                 chk->whoTo = NULL;
7564
7565         if (sp->holds_key_ref) {
7566                 chk->auth_keyid = sp->auth_keyid;
7567                 sctp_auth_key_acquire(stcb, chk->auth_keyid);
7568                 chk->holds_key_ref = 1;
7569         }
7570         chk->rec.data.tsn = atomic_fetchadd_int(&asoc->sending_seq, 1);
7571         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_AT_SEND_2_OUTQ) {
7572                 sctp_misc_ints(SCTP_STRMOUT_LOG_SEND,
7573                     (uint32_t) (uintptr_t) stcb, sp->length,
7574                     (uint32_t) ((chk->rec.data.sid << 16) | (0x0000ffff & chk->rec.data.mid)),
7575                     chk->rec.data.tsn);
7576         }
7577         if (stcb->asoc.idata_supported == 0) {
7578                 dchkh = mtod(chk->data, struct sctp_data_chunk *);
7579         } else {
7580                 ndchkh = mtod(chk->data, struct sctp_idata_chunk *);
7581         }
7582         /*
7583          * Put the rest of the things in place now. Size was done earlier in
7584          * previous loop prior to padding.
7585          */
7586
7587 #ifdef SCTP_ASOCLOG_OF_TSNS
7588         SCTP_TCB_LOCK_ASSERT(stcb);
7589         if (asoc->tsn_out_at >= SCTP_TSN_LOG_SIZE) {
7590                 asoc->tsn_out_at = 0;
7591                 asoc->tsn_out_wrapped = 1;
7592         }
7593         asoc->out_tsnlog[asoc->tsn_out_at].tsn = chk->rec.data.tsn;
7594         asoc->out_tsnlog[asoc->tsn_out_at].strm = chk->rec.data.sid;
7595         asoc->out_tsnlog[asoc->tsn_out_at].seq = chk->rec.data.mid;
7596         asoc->out_tsnlog[asoc->tsn_out_at].sz = chk->send_size;
7597         asoc->out_tsnlog[asoc->tsn_out_at].flgs = chk->rec.data.rcv_flags;
7598         asoc->out_tsnlog[asoc->tsn_out_at].stcb = (void *)stcb;
7599         asoc->out_tsnlog[asoc->tsn_out_at].in_pos = asoc->tsn_out_at;
7600         asoc->out_tsnlog[asoc->tsn_out_at].in_out = 2;
7601         asoc->tsn_out_at++;
7602 #endif
7603         if (stcb->asoc.idata_supported == 0) {
7604                 dchkh->ch.chunk_type = SCTP_DATA;
7605                 dchkh->ch.chunk_flags = chk->rec.data.rcv_flags;
7606                 dchkh->dp.tsn = htonl(chk->rec.data.tsn);
7607                 dchkh->dp.sid = htons(strq->sid);
7608                 dchkh->dp.ssn = htons((uint16_t) chk->rec.data.mid);
7609                 dchkh->dp.ppid = chk->rec.data.ppid;
7610                 dchkh->ch.chunk_length = htons(chk->send_size);
7611         } else {
7612                 ndchkh->ch.chunk_type = SCTP_IDATA;
7613                 ndchkh->ch.chunk_flags = chk->rec.data.rcv_flags;
7614                 ndchkh->dp.tsn = htonl(chk->rec.data.tsn);
7615                 ndchkh->dp.sid = htons(strq->sid);
7616                 ndchkh->dp.reserved = htons(0);
7617                 ndchkh->dp.mid = htonl(chk->rec.data.mid);
7618                 if (sp->fsn == 0)
7619                         ndchkh->dp.ppid_fsn.ppid = chk->rec.data.ppid;
7620                 else
7621                         ndchkh->dp.ppid_fsn.fsn = htonl(sp->fsn);
7622                 sp->fsn++;
7623                 ndchkh->ch.chunk_length = htons(chk->send_size);
7624         }
7625         /* Now advance the chk->send_size by the actual pad needed. */
7626         if (chk->send_size < SCTP_SIZE32(chk->book_size)) {
7627                 /* need a pad */
7628                 struct mbuf *lm;
7629                 int pads;
7630
7631                 pads = SCTP_SIZE32(chk->book_size) - chk->send_size;
7632                 lm = sctp_pad_lastmbuf(chk->data, pads, chk->last_mbuf);
7633                 if (lm != NULL) {
7634                         chk->last_mbuf = lm;
7635                         chk->pad_inplace = 1;
7636                 }
7637                 chk->send_size += pads;
7638         }
7639         if (PR_SCTP_ENABLED(chk->flags)) {
7640                 asoc->pr_sctp_cnt++;
7641         }
7642         if (sp->msg_is_complete && (sp->length == 0) && (sp->sender_all_done)) {
7643                 /* All done pull and kill the message */
7644                 if (sp->put_last_out == 0) {
7645                         SCTP_PRINTF("Gak, put out entire msg with NO end!-2\n");
7646                         SCTP_PRINTF("sender_done:%d len:%d msg_comp:%d put_last_out:%d send_lock:%d\n",
7647                             sp->sender_all_done,
7648                             sp->length,
7649                             sp->msg_is_complete,
7650                             sp->put_last_out,
7651                             send_lock_up);
7652                 }
7653                 if ((send_lock_up == 0) && (TAILQ_NEXT(sp, next) == NULL)) {
7654                         SCTP_TCB_SEND_LOCK(stcb);
7655                         send_lock_up = 1;
7656                 }
7657                 atomic_subtract_int(&asoc->stream_queue_cnt, 1);
7658                 TAILQ_REMOVE(&strq->outqueue, sp, next);
7659                 stcb->asoc.ss_functions.sctp_ss_remove_from_stream(stcb, asoc, strq, sp, send_lock_up);
7660                 if ((strq->state == SCTP_STREAM_RESET_PENDING) &&
7661                     (strq->chunks_on_queues == 0) &&
7662                     TAILQ_EMPTY(&strq->outqueue)) {
7663                         stcb->asoc.trigger_reset = 1;
7664                 }
7665                 if (sp->net) {
7666                         sctp_free_remote_addr(sp->net);
7667                         sp->net = NULL;
7668                 }
7669                 if (sp->data) {
7670                         sctp_m_freem(sp->data);
7671                         sp->data = NULL;
7672                 }
7673                 sctp_free_a_strmoq(stcb, sp, so_locked);
7674         }
7675         asoc->chunks_on_out_queue++;
7676         strq->chunks_on_queues++;
7677         TAILQ_INSERT_TAIL(&asoc->send_queue, chk, sctp_next);
7678         asoc->send_queue_cnt++;
7679 out_of:
7680         if (send_lock_up) {
7681                 SCTP_TCB_SEND_UNLOCK(stcb);
7682         }
7683         return (to_move);
7684 }
7685
7686
7687 static void
7688 sctp_fill_outqueue(struct sctp_tcb *stcb,
7689     struct sctp_nets *net, int frag_point, int eeor_mode, int *quit_now, int so_locked
7690 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
7691     SCTP_UNUSED
7692 #endif
7693 )
7694 {
7695         struct sctp_association *asoc;
7696         struct sctp_stream_out *strq;
7697         uint32_t space_left, moved, total_moved;
7698         int bail, giveup;
7699
7700         SCTP_TCB_LOCK_ASSERT(stcb);
7701         asoc = &stcb->asoc;
7702         total_moved = 0;
7703         switch (net->ro._l_addr.sa.sa_family) {
7704 #ifdef INET
7705         case AF_INET:
7706                 space_left = net->mtu - SCTP_MIN_V4_OVERHEAD;
7707                 break;
7708 #endif
7709 #ifdef INET6
7710         case AF_INET6:
7711                 space_left = net->mtu - SCTP_MIN_OVERHEAD;
7712                 break;
7713 #endif
7714         default:
7715                 /* TSNH */
7716                 space_left = net->mtu;
7717                 break;
7718         }
7719         /* Need an allowance for the data chunk header too */
7720         space_left -= SCTP_DATA_CHUNK_OVERHEAD(stcb);
7721
7722         /* must make even word boundary */
7723         space_left &= 0xfffffffc;
7724         strq = stcb->asoc.ss_functions.sctp_ss_select_stream(stcb, net, asoc);
7725         giveup = 0;
7726         bail = 0;
7727         while ((space_left > 0) && (strq != NULL)) {
7728                 moved = sctp_move_to_outqueue(stcb, strq, space_left, frag_point,
7729                     &giveup, eeor_mode, &bail, so_locked);
7730                 stcb->asoc.ss_functions.sctp_ss_scheduled(stcb, net, asoc, strq, moved);
7731                 if ((giveup != 0) || (bail != 0)) {
7732                         break;
7733                 }
7734                 strq = stcb->asoc.ss_functions.sctp_ss_select_stream(stcb, net, asoc);
7735                 total_moved += moved;
7736                 space_left -= moved;
7737                 if (space_left >= SCTP_DATA_CHUNK_OVERHEAD(stcb)) {
7738                         space_left -= SCTP_DATA_CHUNK_OVERHEAD(stcb);
7739                 } else {
7740                         space_left = 0;
7741                 }
7742                 space_left &= 0xfffffffc;
7743         }
7744         if (bail != 0)
7745                 *quit_now = 1;
7746
7747         stcb->asoc.ss_functions.sctp_ss_packet_done(stcb, net, asoc);
7748
7749         if (total_moved == 0) {
7750                 if ((stcb->asoc.sctp_cmt_on_off == 0) &&
7751                     (net == stcb->asoc.primary_destination)) {
7752                         /* ran dry for primary network net */
7753                         SCTP_STAT_INCR(sctps_primary_randry);
7754                 } else if (stcb->asoc.sctp_cmt_on_off > 0) {
7755                         /* ran dry with CMT on */
7756                         SCTP_STAT_INCR(sctps_cmt_randry);
7757                 }
7758         }
7759 }
7760
7761 void
7762 sctp_fix_ecn_echo(struct sctp_association *asoc)
7763 {
7764         struct sctp_tmit_chunk *chk;
7765
7766         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
7767                 if (chk->rec.chunk_id.id == SCTP_ECN_ECHO) {
7768                         chk->sent = SCTP_DATAGRAM_UNSENT;
7769                 }
7770         }
7771 }
7772
7773 void
7774 sctp_move_chunks_from_net(struct sctp_tcb *stcb, struct sctp_nets *net)
7775 {
7776         struct sctp_association *asoc;
7777         struct sctp_tmit_chunk *chk;
7778         struct sctp_stream_queue_pending *sp;
7779         unsigned int i;
7780
7781         if (net == NULL) {
7782                 return;
7783         }
7784         asoc = &stcb->asoc;
7785         for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
7786                 TAILQ_FOREACH(sp, &stcb->asoc.strmout[i].outqueue, next) {
7787                         if (sp->net == net) {
7788                                 sctp_free_remote_addr(sp->net);
7789                                 sp->net = NULL;
7790                         }
7791                 }
7792         }
7793         TAILQ_FOREACH(chk, &asoc->send_queue, sctp_next) {
7794                 if (chk->whoTo == net) {
7795                         sctp_free_remote_addr(chk->whoTo);
7796                         chk->whoTo = NULL;
7797                 }
7798         }
7799 }
7800
7801 int
7802 sctp_med_chunk_output(struct sctp_inpcb *inp,
7803     struct sctp_tcb *stcb,
7804     struct sctp_association *asoc,
7805     int *num_out,
7806     int *reason_code,
7807     int control_only, int from_where,
7808     struct timeval *now, int *now_filled, int frag_point, int so_locked
7809 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
7810     SCTP_UNUSED
7811 #endif
7812 )
7813 {
7814         /**
7815          * Ok this is the generic chunk service queue. we must do the
7816          * following:
7817          * - Service the stream queue that is next, moving any
7818          *   message (note I must get a complete message i.e. FIRST/MIDDLE and
7819          *   LAST to the out queue in one pass) and assigning TSN's. This
7820          *   only applys though if the peer does not support NDATA. For NDATA
7821          *   chunks its ok to not send the entire message ;-)
7822          * - Check to see if the cwnd/rwnd allows any output, if so we go ahead and
7823          *   fomulate and send the low level chunks. Making sure to combine
7824          *   any control in the control chunk queue also.
7825          */
7826         struct sctp_nets *net, *start_at, *sack_goes_to = NULL, *old_start_at = NULL;
7827         struct mbuf *outchain, *endoutchain;
7828         struct sctp_tmit_chunk *chk, *nchk;
7829
7830         /* temp arrays for unlinking */
7831         struct sctp_tmit_chunk *data_list[SCTP_MAX_DATA_BUNDLING];
7832         int no_fragmentflg, error;
7833         unsigned int max_rwnd_per_dest, max_send_per_dest;
7834         int one_chunk, hbflag, skip_data_for_this_net;
7835         int asconf, cookie, no_out_cnt;
7836         int bundle_at, ctl_cnt, no_data_chunks, eeor_mode;
7837         unsigned int mtu, r_mtu, omtu, mx_mtu, to_out;
7838         int tsns_sent = 0;
7839         uint32_t auth_offset = 0;
7840         struct sctp_auth_chunk *auth = NULL;
7841         uint16_t auth_keyid;
7842         int override_ok = 1;
7843         int skip_fill_up = 0;
7844         int data_auth_reqd = 0;
7845
7846         /*
7847          * JRS 5/14/07 - Add flag for whether a heartbeat is sent to the
7848          * destination.
7849          */
7850         int quit_now = 0;
7851
7852         *num_out = 0;
7853         *reason_code = 0;
7854         auth_keyid = stcb->asoc.authinfo.active_keyid;
7855         if ((asoc->state & SCTP_STATE_SHUTDOWN_PENDING) ||
7856             (asoc->state & SCTP_STATE_SHUTDOWN_RECEIVED) ||
7857             (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_EXPLICIT_EOR))) {
7858                 eeor_mode = 1;
7859         } else {
7860                 eeor_mode = 0;
7861         }
7862         ctl_cnt = no_out_cnt = asconf = cookie = 0;
7863         /*
7864          * First lets prime the pump. For each destination, if there is room
7865          * in the flight size, attempt to pull an MTU's worth out of the
7866          * stream queues into the general send_queue
7867          */
7868 #ifdef SCTP_AUDITING_ENABLED
7869         sctp_audit_log(0xC2, 2);
7870 #endif
7871         SCTP_TCB_LOCK_ASSERT(stcb);
7872         hbflag = 0;
7873         if (control_only)
7874                 no_data_chunks = 1;
7875         else
7876                 no_data_chunks = 0;
7877
7878         /* Nothing to possible to send? */
7879         if ((TAILQ_EMPTY(&asoc->control_send_queue) ||
7880             (asoc->ctrl_queue_cnt == stcb->asoc.ecn_echo_cnt_onq)) &&
7881             TAILQ_EMPTY(&asoc->asconf_send_queue) &&
7882             TAILQ_EMPTY(&asoc->send_queue) &&
7883             sctp_is_there_unsent_data(stcb, so_locked) == 0) {
7884 nothing_to_send:
7885                 *reason_code = 9;
7886                 return (0);
7887         }
7888         if (asoc->peers_rwnd == 0) {
7889                 /* No room in peers rwnd */
7890                 *reason_code = 1;
7891                 if (asoc->total_flight > 0) {
7892                         /* we are allowed one chunk in flight */
7893                         no_data_chunks = 1;
7894                 }
7895         }
7896         if (stcb->asoc.ecn_echo_cnt_onq) {
7897                 /* Record where a sack goes, if any */
7898                 if (no_data_chunks &&
7899                     (asoc->ctrl_queue_cnt == stcb->asoc.ecn_echo_cnt_onq)) {
7900                         /* Nothing but ECNe to send - we don't do that */
7901                         goto nothing_to_send;
7902                 }
7903                 TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
7904                         if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
7905                             (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK)) {
7906                                 sack_goes_to = chk->whoTo;
7907                                 break;
7908                         }
7909                 }
7910         }
7911         max_rwnd_per_dest = ((asoc->peers_rwnd + asoc->total_flight) / asoc->numnets);
7912         if (stcb->sctp_socket)
7913                 max_send_per_dest = SCTP_SB_LIMIT_SND(stcb->sctp_socket) / asoc->numnets;
7914         else
7915                 max_send_per_dest = 0;
7916         if (no_data_chunks == 0) {
7917                 /* How many non-directed chunks are there? */
7918                 TAILQ_FOREACH(chk, &asoc->send_queue, sctp_next) {
7919                         if (chk->whoTo == NULL) {
7920                                 /*
7921                                  * We already have non-directed chunks on
7922                                  * the queue, no need to do a fill-up.
7923                                  */
7924                                 skip_fill_up = 1;
7925                                 break;
7926                         }
7927                 }
7928
7929         }
7930         if ((no_data_chunks == 0) &&
7931             (skip_fill_up == 0) &&
7932             (!stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc))) {
7933                 TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
7934                         /*
7935                          * This for loop we are in takes in each net, if
7936                          * its's got space in cwnd and has data sent to it
7937                          * (when CMT is off) then it calls
7938                          * sctp_fill_outqueue for the net. This gets data on
7939                          * the send queue for that network.
7940                          *
7941                          * In sctp_fill_outqueue TSN's are assigned and data
7942                          * is copied out of the stream buffers. Note mostly
7943                          * copy by reference (we hope).
7944                          */
7945                         net->window_probe = 0;
7946                         if ((net != stcb->asoc.alternate) &&
7947                             ((net->dest_state & SCTP_ADDR_PF) ||
7948                             (!(net->dest_state & SCTP_ADDR_REACHABLE)) ||
7949                             (net->dest_state & SCTP_ADDR_UNCONFIRMED))) {
7950                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
7951                                         sctp_log_cwnd(stcb, net, 1,
7952                                             SCTP_CWND_LOG_FILL_OUTQ_CALLED);
7953                                 }
7954                                 continue;
7955                         }
7956                         if ((stcb->asoc.cc_functions.sctp_cwnd_new_transmission_begins) &&
7957                             (net->flight_size == 0)) {
7958                                 (*stcb->asoc.cc_functions.sctp_cwnd_new_transmission_begins) (stcb, net);
7959                         }
7960                         if (net->flight_size >= net->cwnd) {
7961                                 /* skip this network, no room - can't fill */
7962                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
7963                                         sctp_log_cwnd(stcb, net, 3,
7964                                             SCTP_CWND_LOG_FILL_OUTQ_CALLED);
7965                                 }
7966                                 continue;
7967                         }
7968                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
7969                                 sctp_log_cwnd(stcb, net, 4, SCTP_CWND_LOG_FILL_OUTQ_CALLED);
7970                         }
7971                         sctp_fill_outqueue(stcb, net, frag_point, eeor_mode, &quit_now, so_locked);
7972                         if (quit_now) {
7973                                 /* memory alloc failure */
7974                                 no_data_chunks = 1;
7975                                 break;
7976                         }
7977                 }
7978         }
7979         /* now service each destination and send out what we can for it */
7980         /* Nothing to send? */
7981         if (TAILQ_EMPTY(&asoc->control_send_queue) &&
7982             TAILQ_EMPTY(&asoc->asconf_send_queue) &&
7983             TAILQ_EMPTY(&asoc->send_queue)) {
7984                 *reason_code = 8;
7985                 return (0);
7986         }
7987
7988         if (asoc->sctp_cmt_on_off > 0) {
7989                 /* get the last start point */
7990                 start_at = asoc->last_net_cmt_send_started;
7991                 if (start_at == NULL) {
7992                         /* null so to beginning */
7993                         start_at = TAILQ_FIRST(&asoc->nets);
7994                 } else {
7995                         start_at = TAILQ_NEXT(asoc->last_net_cmt_send_started, sctp_next);
7996                         if (start_at == NULL) {
7997                                 start_at = TAILQ_FIRST(&asoc->nets);
7998                         }
7999                 }
8000                 asoc->last_net_cmt_send_started = start_at;
8001         } else {
8002                 start_at = TAILQ_FIRST(&asoc->nets);
8003         }
8004         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
8005                 if (chk->whoTo == NULL) {
8006                         if (asoc->alternate) {
8007                                 chk->whoTo = asoc->alternate;
8008                         } else {
8009                                 chk->whoTo = asoc->primary_destination;
8010                         }
8011                         atomic_add_int(&chk->whoTo->ref_count, 1);
8012                 }
8013         }
8014         old_start_at = NULL;
8015 again_one_more_time:
8016         for (net = start_at; net != NULL; net = TAILQ_NEXT(net, sctp_next)) {
8017                 /* how much can we send? */
8018                 /* SCTPDBG("Examine for sending net:%x\n", (uint32_t)net); */
8019                 if (old_start_at && (old_start_at == net)) {
8020                         /* through list ocmpletely. */
8021                         break;
8022                 }
8023                 tsns_sent = 0xa;
8024                 if (TAILQ_EMPTY(&asoc->control_send_queue) &&
8025                     TAILQ_EMPTY(&asoc->asconf_send_queue) &&
8026                     (net->flight_size >= net->cwnd)) {
8027                         /*
8028                          * Nothing on control or asconf and flight is full,
8029                          * we can skip even in the CMT case.
8030                          */
8031                         continue;
8032                 }
8033                 bundle_at = 0;
8034                 endoutchain = outchain = NULL;
8035                 no_fragmentflg = 1;
8036                 one_chunk = 0;
8037                 if (net->dest_state & SCTP_ADDR_UNCONFIRMED) {
8038                         skip_data_for_this_net = 1;
8039                 } else {
8040                         skip_data_for_this_net = 0;
8041                 }
8042                 switch (((struct sockaddr *)&net->ro._l_addr)->sa_family) {
8043 #ifdef INET
8044                 case AF_INET:
8045                         mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
8046                         break;
8047 #endif
8048 #ifdef INET6
8049                 case AF_INET6:
8050                         mtu = net->mtu - SCTP_MIN_OVERHEAD;
8051                         break;
8052 #endif
8053                 default:
8054                         /* TSNH */
8055                         mtu = net->mtu;
8056                         break;
8057                 }
8058                 mx_mtu = mtu;
8059                 to_out = 0;
8060                 if (mtu > asoc->peers_rwnd) {
8061                         if (asoc->total_flight > 0) {
8062                                 /* We have a packet in flight somewhere */
8063                                 r_mtu = asoc->peers_rwnd;
8064                         } else {
8065                                 /* We are always allowed to send one MTU out */
8066                                 one_chunk = 1;
8067                                 r_mtu = mtu;
8068                         }
8069                 } else {
8070                         r_mtu = mtu;
8071                 }
8072                 error = 0;
8073                 /************************/
8074                 /* ASCONF transmission */
8075                 /************************/
8076                 /* Now first lets go through the asconf queue */
8077                 TAILQ_FOREACH_SAFE(chk, &asoc->asconf_send_queue, sctp_next, nchk) {
8078                         if (chk->rec.chunk_id.id != SCTP_ASCONF) {
8079                                 continue;
8080                         }
8081                         if (chk->whoTo == NULL) {
8082                                 if (asoc->alternate == NULL) {
8083                                         if (asoc->primary_destination != net) {
8084                                                 break;
8085                                         }
8086                                 } else {
8087                                         if (asoc->alternate != net) {
8088                                                 break;
8089                                         }
8090                                 }
8091                         } else {
8092                                 if (chk->whoTo != net) {
8093                                         break;
8094                                 }
8095                         }
8096                         if (chk->data == NULL) {
8097                                 break;
8098                         }
8099                         if (chk->sent != SCTP_DATAGRAM_UNSENT &&
8100                             chk->sent != SCTP_DATAGRAM_RESEND) {
8101                                 break;
8102                         }
8103                         /*
8104                          * if no AUTH is yet included and this chunk
8105                          * requires it, make sure to account for it.  We
8106                          * don't apply the size until the AUTH chunk is
8107                          * actually added below in case there is no room for
8108                          * this chunk. NOTE: we overload the use of "omtu"
8109                          * here
8110                          */
8111                         if ((auth == NULL) &&
8112                             sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
8113                             stcb->asoc.peer_auth_chunks)) {
8114                                 omtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
8115                         } else
8116                                 omtu = 0;
8117                         /* Here we do NOT factor the r_mtu */
8118                         if ((chk->send_size < (int)(mtu - omtu)) ||
8119                             (chk->flags & CHUNK_FLAGS_FRAGMENT_OK)) {
8120                                 /*
8121                                  * We probably should glom the mbuf chain
8122                                  * from the chk->data for control but the
8123                                  * problem is it becomes yet one more level
8124                                  * of tracking to do if for some reason
8125                                  * output fails. Then I have got to
8126                                  * reconstruct the merged control chain.. el
8127                                  * yucko.. for now we take the easy way and
8128                                  * do the copy
8129                                  */
8130                                 /*
8131                                  * Add an AUTH chunk, if chunk requires it
8132                                  * save the offset into the chain for AUTH
8133                                  */
8134                                 if ((auth == NULL) &&
8135                                     (sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
8136                                     stcb->asoc.peer_auth_chunks))) {
8137                                         outchain = sctp_add_auth_chunk(outchain,
8138                                             &endoutchain,
8139                                             &auth,
8140                                             &auth_offset,
8141                                             stcb,
8142                                             chk->rec.chunk_id.id);
8143                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8144                                 }
8145                                 outchain = sctp_copy_mbufchain(chk->data, outchain, &endoutchain,
8146                                     (int)chk->rec.chunk_id.can_take_data,
8147                                     chk->send_size, chk->copy_by_ref);
8148                                 if (outchain == NULL) {
8149                                         *reason_code = 8;
8150                                         SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
8151                                         return (ENOMEM);
8152                                 }
8153                                 SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8154                                 /* update our MTU size */
8155                                 if (mtu > (chk->send_size + omtu))
8156                                         mtu -= (chk->send_size + omtu);
8157                                 else
8158                                         mtu = 0;
8159                                 to_out += (chk->send_size + omtu);
8160                                 /* Do clear IP_DF ? */
8161                                 if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
8162                                         no_fragmentflg = 0;
8163                                 }
8164                                 if (chk->rec.chunk_id.can_take_data)
8165                                         chk->data = NULL;
8166                                 /*
8167                                  * set hb flag since we can use these for
8168                                  * RTO
8169                                  */
8170                                 hbflag = 1;
8171                                 asconf = 1;
8172                                 /*
8173                                  * should sysctl this: don't bundle data
8174                                  * with ASCONF since it requires AUTH
8175                                  */
8176                                 no_data_chunks = 1;
8177                                 chk->sent = SCTP_DATAGRAM_SENT;
8178                                 if (chk->whoTo == NULL) {
8179                                         chk->whoTo = net;
8180                                         atomic_add_int(&net->ref_count, 1);
8181                                 }
8182                                 chk->snd_count++;
8183                                 if (mtu == 0) {
8184                                         /*
8185                                          * Ok we are out of room but we can
8186                                          * output without effecting the
8187                                          * flight size since this little guy
8188                                          * is a control only packet.
8189                                          */
8190                                         sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp, stcb, net);
8191                                         /*
8192                                          * do NOT clear the asconf flag as
8193                                          * it is used to do appropriate
8194                                          * source address selection.
8195                                          */
8196                                         if (*now_filled == 0) {
8197                                                 (void)SCTP_GETTIME_TIMEVAL(now);
8198                                                 *now_filled = 1;
8199                                         }
8200                                         net->last_sent_time = *now;
8201                                         hbflag = 0;
8202                                         if ((error = sctp_lowlevel_chunk_output(inp, stcb, net,
8203                                             (struct sockaddr *)&net->ro._l_addr,
8204                                             outchain, auth_offset, auth,
8205                                             stcb->asoc.authinfo.active_keyid,
8206                                             no_fragmentflg, 0, asconf,
8207                                             inp->sctp_lport, stcb->rport,
8208                                             htonl(stcb->asoc.peer_vtag),
8209                                             net->port, NULL,
8210                                             0, 0,
8211                                             so_locked))) {
8212                                                 /*
8213                                                  * error, we could not
8214                                                  * output
8215                                                  */
8216                                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
8217                                                 if (from_where == 0) {
8218                                                         SCTP_STAT_INCR(sctps_lowlevelerrusr);
8219                                                 }
8220                                                 if (error == ENOBUFS) {
8221                                                         asoc->ifp_had_enobuf = 1;
8222                                                         SCTP_STAT_INCR(sctps_lowlevelerr);
8223                                                 }
8224                                                 /* error, could not output */
8225                                                 if (error == EHOSTUNREACH) {
8226                                                         /*
8227                                                          * Destination went
8228                                                          * unreachable
8229                                                          * during this send
8230                                                          */
8231                                                         sctp_move_chunks_from_net(stcb, net);
8232                                                 }
8233                                                 *reason_code = 7;
8234                                                 break;
8235                                         } else {
8236                                                 asoc->ifp_had_enobuf = 0;
8237                                         }
8238                                         /*
8239                                          * increase the number we sent, if a
8240                                          * cookie is sent we don't tell them
8241                                          * any was sent out.
8242                                          */
8243                                         outchain = endoutchain = NULL;
8244                                         auth = NULL;
8245                                         auth_offset = 0;
8246                                         if (!no_out_cnt)
8247                                                 *num_out += ctl_cnt;
8248                                         /* recalc a clean slate and setup */
8249                                         switch (net->ro._l_addr.sa.sa_family) {
8250 #ifdef INET
8251                                         case AF_INET:
8252                                                 mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
8253                                                 break;
8254 #endif
8255 #ifdef INET6
8256                                         case AF_INET6:
8257                                                 mtu = net->mtu - SCTP_MIN_OVERHEAD;
8258                                                 break;
8259 #endif
8260                                         default:
8261                                                 /* TSNH */
8262                                                 mtu = net->mtu;
8263                                                 break;
8264                                         }
8265                                         to_out = 0;
8266                                         no_fragmentflg = 1;
8267                                 }
8268                         }
8269                 }
8270                 if (error != 0) {
8271                         /* try next net */
8272                         continue;
8273                 }
8274                 /************************/
8275                 /* Control transmission */
8276                 /************************/
8277                 /* Now first lets go through the control queue */
8278                 TAILQ_FOREACH_SAFE(chk, &asoc->control_send_queue, sctp_next, nchk) {
8279                         if ((sack_goes_to) &&
8280                             (chk->rec.chunk_id.id == SCTP_ECN_ECHO) &&
8281                             (chk->whoTo != sack_goes_to)) {
8282                                 /*
8283                                  * if we have a sack in queue, and we are
8284                                  * looking at an ecn echo that is NOT queued
8285                                  * to where the sack is going..
8286                                  */
8287                                 if (chk->whoTo == net) {
8288                                         /*
8289                                          * Don't transmit it to where its
8290                                          * going (current net)
8291                                          */
8292                                         continue;
8293                                 } else if (sack_goes_to == net) {
8294                                         /*
8295                                          * But do transmit it to this
8296                                          * address
8297                                          */
8298                                         goto skip_net_check;
8299                                 }
8300                         }
8301                         if (chk->whoTo == NULL) {
8302                                 if (asoc->alternate == NULL) {
8303                                         if (asoc->primary_destination != net) {
8304                                                 continue;
8305                                         }
8306                                 } else {
8307                                         if (asoc->alternate != net) {
8308                                                 continue;
8309                                         }
8310                                 }
8311                         } else {
8312                                 if (chk->whoTo != net) {
8313                                         continue;
8314                                 }
8315                         }
8316         skip_net_check:
8317                         if (chk->data == NULL) {
8318                                 continue;
8319                         }
8320                         if (chk->sent != SCTP_DATAGRAM_UNSENT) {
8321                                 /*
8322                                  * It must be unsent. Cookies and ASCONF's
8323                                  * hang around but there timers will force
8324                                  * when marked for resend.
8325                                  */
8326                                 continue;
8327                         }
8328                         /*
8329                          * if no AUTH is yet included and this chunk
8330                          * requires it, make sure to account for it.  We
8331                          * don't apply the size until the AUTH chunk is
8332                          * actually added below in case there is no room for
8333                          * this chunk. NOTE: we overload the use of "omtu"
8334                          * here
8335                          */
8336                         if ((auth == NULL) &&
8337                             sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
8338                             stcb->asoc.peer_auth_chunks)) {
8339                                 omtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
8340                         } else
8341                                 omtu = 0;
8342                         /* Here we do NOT factor the r_mtu */
8343                         if ((chk->send_size <= (int)(mtu - omtu)) ||
8344                             (chk->flags & CHUNK_FLAGS_FRAGMENT_OK)) {
8345                                 /*
8346                                  * We probably should glom the mbuf chain
8347                                  * from the chk->data for control but the
8348                                  * problem is it becomes yet one more level
8349                                  * of tracking to do if for some reason
8350                                  * output fails. Then I have got to
8351                                  * reconstruct the merged control chain.. el
8352                                  * yucko.. for now we take the easy way and
8353                                  * do the copy
8354                                  */
8355                                 /*
8356                                  * Add an AUTH chunk, if chunk requires it
8357                                  * save the offset into the chain for AUTH
8358                                  */
8359                                 if ((auth == NULL) &&
8360                                     (sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
8361                                     stcb->asoc.peer_auth_chunks))) {
8362                                         outchain = sctp_add_auth_chunk(outchain,
8363                                             &endoutchain,
8364                                             &auth,
8365                                             &auth_offset,
8366                                             stcb,
8367                                             chk->rec.chunk_id.id);
8368                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8369                                 }
8370                                 outchain = sctp_copy_mbufchain(chk->data, outchain, &endoutchain,
8371                                     (int)chk->rec.chunk_id.can_take_data,
8372                                     chk->send_size, chk->copy_by_ref);
8373                                 if (outchain == NULL) {
8374                                         *reason_code = 8;
8375                                         SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
8376                                         return (ENOMEM);
8377                                 }
8378                                 SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8379                                 /* update our MTU size */
8380                                 if (mtu > (chk->send_size + omtu))
8381                                         mtu -= (chk->send_size + omtu);
8382                                 else
8383                                         mtu = 0;
8384                                 to_out += (chk->send_size + omtu);
8385                                 /* Do clear IP_DF ? */
8386                                 if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
8387                                         no_fragmentflg = 0;
8388                                 }
8389                                 if (chk->rec.chunk_id.can_take_data)
8390                                         chk->data = NULL;
8391                                 /* Mark things to be removed, if needed */
8392                                 if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
8393                                     (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK) ||  /* EY */
8394                                     (chk->rec.chunk_id.id == SCTP_HEARTBEAT_REQUEST) ||
8395                                     (chk->rec.chunk_id.id == SCTP_HEARTBEAT_ACK) ||
8396                                     (chk->rec.chunk_id.id == SCTP_SHUTDOWN) ||
8397                                     (chk->rec.chunk_id.id == SCTP_SHUTDOWN_ACK) ||
8398                                     (chk->rec.chunk_id.id == SCTP_OPERATION_ERROR) ||
8399                                     (chk->rec.chunk_id.id == SCTP_COOKIE_ACK) ||
8400                                     (chk->rec.chunk_id.id == SCTP_ECN_CWR) ||
8401                                     (chk->rec.chunk_id.id == SCTP_PACKET_DROPPED) ||
8402                                     (chk->rec.chunk_id.id == SCTP_ASCONF_ACK)) {
8403                                         if (chk->rec.chunk_id.id == SCTP_HEARTBEAT_REQUEST) {
8404                                                 hbflag = 1;
8405                                         }
8406                                         /* remove these chunks at the end */
8407                                         if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
8408                                             (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK)) {
8409                                                 /* turn off the timer */
8410                                                 if (SCTP_OS_TIMER_PENDING(&stcb->asoc.dack_timer.timer)) {
8411                                                         sctp_timer_stop(SCTP_TIMER_TYPE_RECV,
8412                                                             inp, stcb, net,
8413                                                             SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_1);
8414                                                 }
8415                                         }
8416                                         ctl_cnt++;
8417                                 } else {
8418                                         /*
8419                                          * Other chunks, since they have
8420                                          * timers running (i.e. COOKIE) we
8421                                          * just "trust" that it gets sent or
8422                                          * retransmitted.
8423                                          */
8424                                         ctl_cnt++;
8425                                         if (chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
8426                                                 cookie = 1;
8427                                                 no_out_cnt = 1;
8428                                         } else if (chk->rec.chunk_id.id == SCTP_ECN_ECHO) {
8429                                                 /*
8430                                                  * Increment ecne send count
8431                                                  * here this means we may be
8432                                                  * over-zealous in our
8433                                                  * counting if the send
8434                                                  * fails, but its the best
8435                                                  * place to do it (we used
8436                                                  * to do it in the queue of
8437                                                  * the chunk, but that did
8438                                                  * not tell how many times
8439                                                  * it was sent.
8440                                                  */
8441                                                 SCTP_STAT_INCR(sctps_sendecne);
8442                                         }
8443                                         chk->sent = SCTP_DATAGRAM_SENT;
8444                                         if (chk->whoTo == NULL) {
8445                                                 chk->whoTo = net;
8446                                                 atomic_add_int(&net->ref_count, 1);
8447                                         }
8448                                         chk->snd_count++;
8449                                 }
8450                                 if (mtu == 0) {
8451                                         /*
8452                                          * Ok we are out of room but we can
8453                                          * output without effecting the
8454                                          * flight size since this little guy
8455                                          * is a control only packet.
8456                                          */
8457                                         if (asconf) {
8458                                                 sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp, stcb, net);
8459                                                 /*
8460                                                  * do NOT clear the asconf
8461                                                  * flag as it is used to do
8462                                                  * appropriate source
8463                                                  * address selection.
8464                                                  */
8465                                         }
8466                                         if (cookie) {
8467                                                 sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, inp, stcb, net);
8468                                                 cookie = 0;
8469                                         }
8470                                         /* Only HB or ASCONF advances time */
8471                                         if (hbflag) {
8472                                                 if (*now_filled == 0) {
8473                                                         (void)SCTP_GETTIME_TIMEVAL(now);
8474                                                         *now_filled = 1;
8475                                                 }
8476                                                 net->last_sent_time = *now;
8477                                                 hbflag = 0;
8478                                         }
8479                                         if ((error = sctp_lowlevel_chunk_output(inp, stcb, net,
8480                                             (struct sockaddr *)&net->ro._l_addr,
8481                                             outchain,
8482                                             auth_offset, auth,
8483                                             stcb->asoc.authinfo.active_keyid,
8484                                             no_fragmentflg, 0, asconf,
8485                                             inp->sctp_lport, stcb->rport,
8486                                             htonl(stcb->asoc.peer_vtag),
8487                                             net->port, NULL,
8488                                             0, 0,
8489                                             so_locked))) {
8490                                                 /*
8491                                                  * error, we could not
8492                                                  * output
8493                                                  */
8494                                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
8495                                                 if (from_where == 0) {
8496                                                         SCTP_STAT_INCR(sctps_lowlevelerrusr);
8497                                                 }
8498                                                 if (error == ENOBUFS) {
8499                                                         asoc->ifp_had_enobuf = 1;
8500                                                         SCTP_STAT_INCR(sctps_lowlevelerr);
8501                                                 }
8502                                                 if (error == EHOSTUNREACH) {
8503                                                         /*
8504                                                          * Destination went
8505                                                          * unreachable
8506                                                          * during this send
8507                                                          */
8508                                                         sctp_move_chunks_from_net(stcb, net);
8509                                                 }
8510                                                 *reason_code = 7;
8511                                                 break;
8512                                         } else {
8513                                                 asoc->ifp_had_enobuf = 0;
8514                                         }
8515                                         /*
8516                                          * increase the number we sent, if a
8517                                          * cookie is sent we don't tell them
8518                                          * any was sent out.
8519                                          */
8520                                         outchain = endoutchain = NULL;
8521                                         auth = NULL;
8522                                         auth_offset = 0;
8523                                         if (!no_out_cnt)
8524                                                 *num_out += ctl_cnt;
8525                                         /* recalc a clean slate and setup */
8526                                         switch (net->ro._l_addr.sa.sa_family) {
8527 #ifdef INET
8528                                         case AF_INET:
8529                                                 mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
8530                                                 break;
8531 #endif
8532 #ifdef INET6
8533                                         case AF_INET6:
8534                                                 mtu = net->mtu - SCTP_MIN_OVERHEAD;
8535                                                 break;
8536 #endif
8537                                         default:
8538                                                 /* TSNH */
8539                                                 mtu = net->mtu;
8540                                                 break;
8541                                         }
8542                                         to_out = 0;
8543                                         no_fragmentflg = 1;
8544                                 }
8545                         }
8546                 }
8547                 if (error != 0) {
8548                         /* try next net */
8549                         continue;
8550                 }
8551                 /* JRI: if dest is in PF state, do not send data to it */
8552                 if ((asoc->sctp_cmt_on_off > 0) &&
8553                     (net != stcb->asoc.alternate) &&
8554                     (net->dest_state & SCTP_ADDR_PF)) {
8555                         goto no_data_fill;
8556                 }
8557                 if (net->flight_size >= net->cwnd) {
8558                         goto no_data_fill;
8559                 }
8560                 if ((asoc->sctp_cmt_on_off > 0) &&
8561                     (SCTP_BASE_SYSCTL(sctp_buffer_splitting) & SCTP_RECV_BUFFER_SPLITTING) &&
8562                     (net->flight_size > max_rwnd_per_dest)) {
8563                         goto no_data_fill;
8564                 }
8565                 /*
8566                  * We need a specific accounting for the usage of the send
8567                  * buffer. We also need to check the number of messages per
8568                  * net. For now, this is better than nothing and it disabled
8569                  * by default...
8570                  */
8571                 if ((asoc->sctp_cmt_on_off > 0) &&
8572                     (SCTP_BASE_SYSCTL(sctp_buffer_splitting) & SCTP_SEND_BUFFER_SPLITTING) &&
8573                     (max_send_per_dest > 0) &&
8574                     (net->flight_size > max_send_per_dest)) {
8575                         goto no_data_fill;
8576                 }
8577                 /*********************/
8578                 /* Data transmission */
8579                 /*********************/
8580                 /*
8581                  * if AUTH for DATA is required and no AUTH has been added
8582                  * yet, account for this in the mtu now... if no data can be
8583                  * bundled, this adjustment won't matter anyways since the
8584                  * packet will be going out...
8585                  */
8586                 data_auth_reqd = sctp_auth_is_required_chunk(SCTP_DATA,
8587                     stcb->asoc.peer_auth_chunks);
8588                 if (data_auth_reqd && (auth == NULL)) {
8589                         mtu -= sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
8590                 }
8591                 /* now lets add any data within the MTU constraints */
8592                 switch (((struct sockaddr *)&net->ro._l_addr)->sa_family) {
8593 #ifdef INET
8594                 case AF_INET:
8595                         if (net->mtu > SCTP_MIN_V4_OVERHEAD)
8596                                 omtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
8597                         else
8598                                 omtu = 0;
8599                         break;
8600 #endif
8601 #ifdef INET6
8602                 case AF_INET6:
8603                         if (net->mtu > SCTP_MIN_OVERHEAD)
8604                                 omtu = net->mtu - SCTP_MIN_OVERHEAD;
8605                         else
8606                                 omtu = 0;
8607                         break;
8608 #endif
8609                 default:
8610                         /* TSNH */
8611                         omtu = 0;
8612                         break;
8613                 }
8614                 if ((((SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) ||
8615                     (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED)) &&
8616                     (skip_data_for_this_net == 0)) ||
8617                     (cookie)) {
8618                         TAILQ_FOREACH_SAFE(chk, &asoc->send_queue, sctp_next, nchk) {
8619                                 if (no_data_chunks) {
8620                                         /* let only control go out */
8621                                         *reason_code = 1;
8622                                         break;
8623                                 }
8624                                 if (net->flight_size >= net->cwnd) {
8625                                         /* skip this net, no room for data */
8626                                         *reason_code = 2;
8627                                         break;
8628                                 }
8629                                 if ((chk->whoTo != NULL) &&
8630                                     (chk->whoTo != net)) {
8631                                         /* Don't send the chunk on this net */
8632                                         continue;
8633                                 }
8634
8635                                 if (asoc->sctp_cmt_on_off == 0) {
8636                                         if ((asoc->alternate) &&
8637                                             (asoc->alternate != net) &&
8638                                             (chk->whoTo == NULL)) {
8639                                                 continue;
8640                                         } else if ((net != asoc->primary_destination) &&
8641                                                     (asoc->alternate == NULL) &&
8642                                             (chk->whoTo == NULL)) {
8643                                                 continue;
8644                                         }
8645                                 }
8646                                 if ((chk->send_size > omtu) && ((chk->flags & CHUNK_FLAGS_FRAGMENT_OK) == 0)) {
8647                                         /*-
8648                                          * strange, we have a chunk that is
8649                                          * to big for its destination and
8650                                          * yet no fragment ok flag.
8651                                          * Something went wrong when the
8652                                          * PMTU changed...we did not mark
8653                                          * this chunk for some reason?? I
8654                                          * will fix it here by letting IP
8655                                          * fragment it for now and printing
8656                                          * a warning. This really should not
8657                                          * happen ...
8658                                          */
8659                                         SCTP_PRINTF("Warning chunk of %d bytes > mtu:%d and yet PMTU disc missed\n",
8660                                             chk->send_size, mtu);
8661                                         chk->flags |= CHUNK_FLAGS_FRAGMENT_OK;
8662                                 }
8663                                 if (SCTP_BASE_SYSCTL(sctp_enable_sack_immediately) &&
8664                                     ((asoc->state & SCTP_STATE_SHUTDOWN_PENDING) == SCTP_STATE_SHUTDOWN_PENDING)) {
8665                                         struct sctp_data_chunk *dchkh;
8666
8667                                         dchkh = mtod(chk->data, struct sctp_data_chunk *);
8668                                         dchkh->ch.chunk_flags |= SCTP_DATA_SACK_IMMEDIATELY;
8669                                 }
8670                                 if (((chk->send_size <= mtu) && (chk->send_size <= r_mtu)) ||
8671                                     ((chk->flags & CHUNK_FLAGS_FRAGMENT_OK) && (chk->send_size <= asoc->peers_rwnd))) {
8672                                         /* ok we will add this one */
8673
8674                                         /*
8675                                          * Add an AUTH chunk, if chunk
8676                                          * requires it, save the offset into
8677                                          * the chain for AUTH
8678                                          */
8679                                         if (data_auth_reqd) {
8680                                                 if (auth == NULL) {
8681                                                         outchain = sctp_add_auth_chunk(outchain,
8682                                                             &endoutchain,
8683                                                             &auth,
8684                                                             &auth_offset,
8685                                                             stcb,
8686                                                             SCTP_DATA);
8687                                                         auth_keyid = chk->auth_keyid;
8688                                                         override_ok = 0;
8689                                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8690                                                 } else if (override_ok) {
8691                                                         /*
8692                                                          * use this data's
8693                                                          * keyid
8694                                                          */
8695                                                         auth_keyid = chk->auth_keyid;
8696                                                         override_ok = 0;
8697                                                 } else if (auth_keyid != chk->auth_keyid) {
8698                                                         /*
8699                                                          * different keyid,
8700                                                          * so done bundling
8701                                                          */
8702                                                         break;
8703                                                 }
8704                                         }
8705                                         outchain = sctp_copy_mbufchain(chk->data, outchain, &endoutchain, 0,
8706                                             chk->send_size, chk->copy_by_ref);
8707                                         if (outchain == NULL) {
8708                                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "No memory?\n");
8709                                                 if (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
8710                                                         sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
8711                                                 }
8712                                                 *reason_code = 3;
8713                                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
8714                                                 return (ENOMEM);
8715                                         }
8716                                         /* upate our MTU size */
8717                                         /* Do clear IP_DF ? */
8718                                         if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
8719                                                 no_fragmentflg = 0;
8720                                         }
8721                                         /* unsigned subtraction of mtu */
8722                                         if (mtu > chk->send_size)
8723                                                 mtu -= chk->send_size;
8724                                         else
8725                                                 mtu = 0;
8726                                         /* unsigned subtraction of r_mtu */
8727                                         if (r_mtu > chk->send_size)
8728                                                 r_mtu -= chk->send_size;
8729                                         else
8730                                                 r_mtu = 0;
8731
8732                                         to_out += chk->send_size;
8733                                         if ((to_out > mx_mtu) && no_fragmentflg) {
8734 #ifdef INVARIANTS
8735                                                 panic("Exceeding mtu of %d out size is %d", mx_mtu, to_out);
8736 #else
8737                                                 SCTP_PRINTF("Exceeding mtu of %d out size is %d\n",
8738                                                     mx_mtu, to_out);
8739 #endif
8740                                         }
8741                                         chk->window_probe = 0;
8742                                         data_list[bundle_at++] = chk;
8743                                         if (bundle_at >= SCTP_MAX_DATA_BUNDLING) {
8744                                                 break;
8745                                         }
8746                                         if (chk->sent == SCTP_DATAGRAM_UNSENT) {
8747                                                 if ((chk->rec.data.rcv_flags & SCTP_DATA_UNORDERED) == 0) {
8748                                                         SCTP_STAT_INCR_COUNTER64(sctps_outorderchunks);
8749                                                 } else {
8750                                                         SCTP_STAT_INCR_COUNTER64(sctps_outunorderchunks);
8751                                                 }
8752                                                 if (((chk->rec.data.rcv_flags & SCTP_DATA_LAST_FRAG) == SCTP_DATA_LAST_FRAG) &&
8753                                                     ((chk->rec.data.rcv_flags & SCTP_DATA_FIRST_FRAG) == 0))
8754                                                         /*
8755                                                          * Count number of
8756                                                          * user msg's that
8757                                                          * were fragmented
8758                                                          * we do this by
8759                                                          * counting when we
8760                                                          * see a LAST
8761                                                          * fragment only.
8762                                                          */
8763                                                         SCTP_STAT_INCR_COUNTER64(sctps_fragusrmsgs);
8764                                         }
8765                                         if ((mtu == 0) || (r_mtu == 0) || (one_chunk)) {
8766                                                 if ((one_chunk) && (stcb->asoc.total_flight == 0)) {
8767                                                         data_list[0]->window_probe = 1;
8768                                                         net->window_probe = 1;
8769                                                 }
8770                                                 break;
8771                                         }
8772                                 } else {
8773                                         /*
8774                                          * Must be sent in order of the
8775                                          * TSN's (on a network)
8776                                          */
8777                                         break;
8778                                 }
8779                         }       /* for (chunk gather loop for this net) */
8780                 }               /* if asoc.state OPEN */
8781 no_data_fill:
8782                 /* Is there something to send for this destination? */
8783                 if (outchain) {
8784                         /* We may need to start a control timer or two */
8785                         if (asconf) {
8786                                 sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp,
8787                                     stcb, net);
8788                                 /*
8789                                  * do NOT clear the asconf flag as it is
8790                                  * used to do appropriate source address
8791                                  * selection.
8792                                  */
8793                         }
8794                         if (cookie) {
8795                                 sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, inp, stcb, net);
8796                                 cookie = 0;
8797                         }
8798                         /* must start a send timer if data is being sent */
8799                         if (bundle_at && (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer))) {
8800                                 /*
8801                                  * no timer running on this destination
8802                                  * restart it.
8803                                  */
8804                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
8805                         }
8806                         if (bundle_at || hbflag) {
8807                                 /* For data/asconf and hb set time */
8808                                 if (*now_filled == 0) {
8809                                         (void)SCTP_GETTIME_TIMEVAL(now);
8810                                         *now_filled = 1;
8811                                 }
8812                                 net->last_sent_time = *now;
8813                         }
8814                         /* Now send it, if there is anything to send :> */
8815                         if ((error = sctp_lowlevel_chunk_output(inp,
8816                             stcb,
8817                             net,
8818                             (struct sockaddr *)&net->ro._l_addr,
8819                             outchain,
8820                             auth_offset,
8821                             auth,
8822                             auth_keyid,
8823                             no_fragmentflg,
8824                             bundle_at,
8825                             asconf,
8826                             inp->sctp_lport, stcb->rport,
8827                             htonl(stcb->asoc.peer_vtag),
8828                             net->port, NULL,
8829                             0, 0,
8830                             so_locked))) {
8831                                 /* error, we could not output */
8832                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
8833                                 if (from_where == 0) {
8834                                         SCTP_STAT_INCR(sctps_lowlevelerrusr);
8835                                 }
8836                                 if (error == ENOBUFS) {
8837                                         asoc->ifp_had_enobuf = 1;
8838                                         SCTP_STAT_INCR(sctps_lowlevelerr);
8839                                 }
8840                                 if (error == EHOSTUNREACH) {
8841                                         /*
8842                                          * Destination went unreachable
8843                                          * during this send
8844                                          */
8845                                         sctp_move_chunks_from_net(stcb, net);
8846                                 }
8847                                 *reason_code = 6;
8848                                 /*-
8849                                  * I add this line to be paranoid. As far as
8850                                  * I can tell the continue, takes us back to
8851                                  * the top of the for, but just to make sure
8852                                  * I will reset these again here.
8853                                  */
8854                                 ctl_cnt = bundle_at = 0;
8855                                 continue;       /* This takes us back to the
8856                                                  * for() for the nets. */
8857                         } else {
8858                                 asoc->ifp_had_enobuf = 0;
8859                         }
8860                         endoutchain = NULL;
8861                         auth = NULL;
8862                         auth_offset = 0;
8863                         if (!no_out_cnt) {
8864                                 *num_out += (ctl_cnt + bundle_at);
8865                         }
8866                         if (bundle_at) {
8867                                 /* setup for a RTO measurement */
8868                                 tsns_sent = data_list[0]->rec.data.tsn;
8869                                 /* fill time if not already filled */
8870                                 if (*now_filled == 0) {
8871                                         (void)SCTP_GETTIME_TIMEVAL(&asoc->time_last_sent);
8872                                         *now_filled = 1;
8873                                         *now = asoc->time_last_sent;
8874                                 } else {
8875                                         asoc->time_last_sent = *now;
8876                                 }
8877                                 if (net->rto_needed) {
8878                                         data_list[0]->do_rtt = 1;
8879                                         net->rto_needed = 0;
8880                                 }
8881                                 SCTP_STAT_INCR_BY(sctps_senddata, bundle_at);
8882                                 sctp_clean_up_datalist(stcb, asoc, data_list, bundle_at, net);
8883                         }
8884                         if (one_chunk) {
8885                                 break;
8886                         }
8887                 }
8888                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
8889                         sctp_log_cwnd(stcb, net, tsns_sent, SCTP_CWND_LOG_FROM_SEND);
8890                 }
8891         }
8892         if (old_start_at == NULL) {
8893                 old_start_at = start_at;
8894                 start_at = TAILQ_FIRST(&asoc->nets);
8895                 if (old_start_at)
8896                         goto again_one_more_time;
8897         }
8898
8899         /*
8900          * At the end there should be no NON timed chunks hanging on this
8901          * queue.
8902          */
8903         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
8904                 sctp_log_cwnd(stcb, net, *num_out, SCTP_CWND_LOG_FROM_SEND);
8905         }
8906         if ((*num_out == 0) && (*reason_code == 0)) {
8907                 *reason_code = 4;
8908         } else {
8909                 *reason_code = 5;
8910         }
8911         sctp_clean_up_ctl(stcb, asoc, so_locked);
8912         return (0);
8913 }
8914
8915 void
8916 sctp_queue_op_err(struct sctp_tcb *stcb, struct mbuf *op_err)
8917 {
8918         /*-
8919          * Prepend a OPERATIONAL_ERROR chunk header and put on the end of
8920          * the control chunk queue.
8921          */
8922         struct sctp_chunkhdr *hdr;
8923         struct sctp_tmit_chunk *chk;
8924         struct mbuf *mat, *last_mbuf;
8925         uint32_t chunk_length;
8926         uint16_t padding_length;
8927
8928         SCTP_TCB_LOCK_ASSERT(stcb);
8929         SCTP_BUF_PREPEND(op_err, sizeof(struct sctp_chunkhdr), M_NOWAIT);
8930         if (op_err == NULL) {
8931                 return;
8932         }
8933         last_mbuf = NULL;
8934         chunk_length = 0;
8935         for (mat = op_err; mat != NULL; mat = SCTP_BUF_NEXT(mat)) {
8936                 chunk_length += SCTP_BUF_LEN(mat);
8937                 if (SCTP_BUF_NEXT(mat) == NULL) {
8938                         last_mbuf = mat;
8939                 }
8940         }
8941         if (chunk_length > SCTP_MAX_CHUNK_LENGTH) {
8942                 sctp_m_freem(op_err);
8943                 return;
8944         }
8945         padding_length = chunk_length % 4;
8946         if (padding_length != 0) {
8947                 padding_length = 4 - padding_length;
8948         }
8949         if (padding_length != 0) {
8950                 if (sctp_add_pad_tombuf(last_mbuf, padding_length) == NULL) {
8951                         sctp_m_freem(op_err);
8952                         return;
8953                 }
8954         }
8955         sctp_alloc_a_chunk(stcb, chk);
8956         if (chk == NULL) {
8957                 /* no memory */
8958                 sctp_m_freem(op_err);
8959                 return;
8960         }
8961         chk->copy_by_ref = 0;
8962         chk->send_size = (uint16_t) chunk_length;
8963         chk->sent = SCTP_DATAGRAM_UNSENT;
8964         chk->snd_count = 0;
8965         chk->asoc = &stcb->asoc;
8966         chk->data = op_err;
8967         chk->whoTo = NULL;
8968         chk->rec.chunk_id.id = SCTP_OPERATION_ERROR;
8969         chk->rec.chunk_id.can_take_data = 0;
8970         hdr = mtod(op_err, struct sctp_chunkhdr *);
8971         hdr->chunk_type = SCTP_OPERATION_ERROR;
8972         hdr->chunk_flags = 0;
8973         hdr->chunk_length = htons(chk->send_size);
8974         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
8975         chk->asoc->ctrl_queue_cnt++;
8976 }
8977
8978 int
8979 sctp_send_cookie_echo(struct mbuf *m,
8980     int offset,
8981     struct sctp_tcb *stcb,
8982     struct sctp_nets *net)
8983 {
8984         /*-
8985          * pull out the cookie and put it at the front of the control chunk
8986          * queue.
8987          */
8988         int at;
8989         struct mbuf *cookie;
8990         struct sctp_paramhdr param, *phdr;
8991         struct sctp_chunkhdr *hdr;
8992         struct sctp_tmit_chunk *chk;
8993         uint16_t ptype, plen;
8994
8995         SCTP_TCB_LOCK_ASSERT(stcb);
8996         /* First find the cookie in the param area */
8997         cookie = NULL;
8998         at = offset + sizeof(struct sctp_init_chunk);
8999         for (;;) {
9000                 phdr = sctp_get_next_param(m, at, &param, sizeof(param));
9001                 if (phdr == NULL) {
9002                         return (-3);
9003                 }
9004                 ptype = ntohs(phdr->param_type);
9005                 plen = ntohs(phdr->param_length);
9006                 if (ptype == SCTP_STATE_COOKIE) {
9007                         int pad;
9008
9009                         /* found the cookie */
9010                         if ((pad = (plen % 4))) {
9011                                 plen += 4 - pad;
9012                         }
9013                         cookie = SCTP_M_COPYM(m, at, plen, M_NOWAIT);
9014                         if (cookie == NULL) {
9015                                 /* No memory */
9016                                 return (-2);
9017                         }
9018 #ifdef SCTP_MBUF_LOGGING
9019                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
9020                                 sctp_log_mbc(cookie, SCTP_MBUF_ICOPY);
9021                         }
9022 #endif
9023                         break;
9024                 }
9025                 at += SCTP_SIZE32(plen);
9026         }
9027         /* ok, we got the cookie lets change it into a cookie echo chunk */
9028         /* first the change from param to cookie */
9029         hdr = mtod(cookie, struct sctp_chunkhdr *);
9030         hdr->chunk_type = SCTP_COOKIE_ECHO;
9031         hdr->chunk_flags = 0;
9032         /* get the chunk stuff now and place it in the FRONT of the queue */
9033         sctp_alloc_a_chunk(stcb, chk);
9034         if (chk == NULL) {
9035                 /* no memory */
9036                 sctp_m_freem(cookie);
9037                 return (-5);
9038         }
9039         chk->copy_by_ref = 0;
9040         chk->rec.chunk_id.id = SCTP_COOKIE_ECHO;
9041         chk->rec.chunk_id.can_take_data = 0;
9042         chk->flags = CHUNK_FLAGS_FRAGMENT_OK;
9043         chk->send_size = plen;
9044         chk->sent = SCTP_DATAGRAM_UNSENT;
9045         chk->snd_count = 0;
9046         chk->asoc = &stcb->asoc;
9047         chk->data = cookie;
9048         chk->whoTo = net;
9049         atomic_add_int(&chk->whoTo->ref_count, 1);
9050         TAILQ_INSERT_HEAD(&chk->asoc->control_send_queue, chk, sctp_next);
9051         chk->asoc->ctrl_queue_cnt++;
9052         return (0);
9053 }
9054
9055 void
9056 sctp_send_heartbeat_ack(struct sctp_tcb *stcb,
9057     struct mbuf *m,
9058     int offset,
9059     int chk_length,
9060     struct sctp_nets *net)
9061 {
9062         /*
9063          * take a HB request and make it into a HB ack and send it.
9064          */
9065         struct mbuf *outchain;
9066         struct sctp_chunkhdr *chdr;
9067         struct sctp_tmit_chunk *chk;
9068
9069
9070         if (net == NULL)
9071                 /* must have a net pointer */
9072                 return;
9073
9074         outchain = SCTP_M_COPYM(m, offset, chk_length, M_NOWAIT);
9075         if (outchain == NULL) {
9076                 /* gak out of memory */
9077                 return;
9078         }
9079 #ifdef SCTP_MBUF_LOGGING
9080         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
9081                 sctp_log_mbc(outchain, SCTP_MBUF_ICOPY);
9082         }
9083 #endif
9084         chdr = mtod(outchain, struct sctp_chunkhdr *);
9085         chdr->chunk_type = SCTP_HEARTBEAT_ACK;
9086         chdr->chunk_flags = 0;
9087         if (chk_length % 4) {
9088                 /* need pad */
9089                 uint32_t cpthis = 0;
9090                 int padlen;
9091
9092                 padlen = 4 - (chk_length % 4);
9093                 m_copyback(outchain, chk_length, padlen, (caddr_t)&cpthis);
9094         }
9095         sctp_alloc_a_chunk(stcb, chk);
9096         if (chk == NULL) {
9097                 /* no memory */
9098                 sctp_m_freem(outchain);
9099                 return;
9100         }
9101         chk->copy_by_ref = 0;
9102         chk->rec.chunk_id.id = SCTP_HEARTBEAT_ACK;
9103         chk->rec.chunk_id.can_take_data = 1;
9104         chk->flags = 0;
9105         chk->send_size = chk_length;
9106         chk->sent = SCTP_DATAGRAM_UNSENT;
9107         chk->snd_count = 0;
9108         chk->asoc = &stcb->asoc;
9109         chk->data = outchain;
9110         chk->whoTo = net;
9111         atomic_add_int(&chk->whoTo->ref_count, 1);
9112         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9113         chk->asoc->ctrl_queue_cnt++;
9114 }
9115
9116 void
9117 sctp_send_cookie_ack(struct sctp_tcb *stcb)
9118 {
9119         /* formulate and queue a cookie-ack back to sender */
9120         struct mbuf *cookie_ack;
9121         struct sctp_chunkhdr *hdr;
9122         struct sctp_tmit_chunk *chk;
9123
9124         SCTP_TCB_LOCK_ASSERT(stcb);
9125
9126         cookie_ack = sctp_get_mbuf_for_msg(sizeof(struct sctp_chunkhdr), 0, M_NOWAIT, 1, MT_HEADER);
9127         if (cookie_ack == NULL) {
9128                 /* no mbuf's */
9129                 return;
9130         }
9131         SCTP_BUF_RESV_UF(cookie_ack, SCTP_MIN_OVERHEAD);
9132         sctp_alloc_a_chunk(stcb, chk);
9133         if (chk == NULL) {
9134                 /* no memory */
9135                 sctp_m_freem(cookie_ack);
9136                 return;
9137         }
9138         chk->copy_by_ref = 0;
9139         chk->rec.chunk_id.id = SCTP_COOKIE_ACK;
9140         chk->rec.chunk_id.can_take_data = 1;
9141         chk->flags = 0;
9142         chk->send_size = sizeof(struct sctp_chunkhdr);
9143         chk->sent = SCTP_DATAGRAM_UNSENT;
9144         chk->snd_count = 0;
9145         chk->asoc = &stcb->asoc;
9146         chk->data = cookie_ack;
9147         if (chk->asoc->last_control_chunk_from != NULL) {
9148                 chk->whoTo = chk->asoc->last_control_chunk_from;
9149                 atomic_add_int(&chk->whoTo->ref_count, 1);
9150         } else {
9151                 chk->whoTo = NULL;
9152         }
9153         hdr = mtod(cookie_ack, struct sctp_chunkhdr *);
9154         hdr->chunk_type = SCTP_COOKIE_ACK;
9155         hdr->chunk_flags = 0;
9156         hdr->chunk_length = htons(chk->send_size);
9157         SCTP_BUF_LEN(cookie_ack) = chk->send_size;
9158         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9159         chk->asoc->ctrl_queue_cnt++;
9160         return;
9161 }
9162
9163
9164 void
9165 sctp_send_shutdown_ack(struct sctp_tcb *stcb, struct sctp_nets *net)
9166 {
9167         /* formulate and queue a SHUTDOWN-ACK back to the sender */
9168         struct mbuf *m_shutdown_ack;
9169         struct sctp_shutdown_ack_chunk *ack_cp;
9170         struct sctp_tmit_chunk *chk;
9171
9172         m_shutdown_ack = sctp_get_mbuf_for_msg(sizeof(struct sctp_shutdown_ack_chunk), 0, M_NOWAIT, 1, MT_HEADER);
9173         if (m_shutdown_ack == NULL) {
9174                 /* no mbuf's */
9175                 return;
9176         }
9177         SCTP_BUF_RESV_UF(m_shutdown_ack, SCTP_MIN_OVERHEAD);
9178         sctp_alloc_a_chunk(stcb, chk);
9179         if (chk == NULL) {
9180                 /* no memory */
9181                 sctp_m_freem(m_shutdown_ack);
9182                 return;
9183         }
9184         chk->copy_by_ref = 0;
9185         chk->rec.chunk_id.id = SCTP_SHUTDOWN_ACK;
9186         chk->rec.chunk_id.can_take_data = 1;
9187         chk->flags = 0;
9188         chk->send_size = sizeof(struct sctp_chunkhdr);
9189         chk->sent = SCTP_DATAGRAM_UNSENT;
9190         chk->snd_count = 0;
9191         chk->flags = 0;
9192         chk->asoc = &stcb->asoc;
9193         chk->data = m_shutdown_ack;
9194         chk->whoTo = net;
9195         if (chk->whoTo) {
9196                 atomic_add_int(&chk->whoTo->ref_count, 1);
9197         }
9198         ack_cp = mtod(m_shutdown_ack, struct sctp_shutdown_ack_chunk *);
9199         ack_cp->ch.chunk_type = SCTP_SHUTDOWN_ACK;
9200         ack_cp->ch.chunk_flags = 0;
9201         ack_cp->ch.chunk_length = htons(chk->send_size);
9202         SCTP_BUF_LEN(m_shutdown_ack) = chk->send_size;
9203         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9204         chk->asoc->ctrl_queue_cnt++;
9205         return;
9206 }
9207
9208 void
9209 sctp_send_shutdown(struct sctp_tcb *stcb, struct sctp_nets *net)
9210 {
9211         /* formulate and queue a SHUTDOWN to the sender */
9212         struct mbuf *m_shutdown;
9213         struct sctp_shutdown_chunk *shutdown_cp;
9214         struct sctp_tmit_chunk *chk;
9215
9216         TAILQ_FOREACH(chk, &stcb->asoc.control_send_queue, sctp_next) {
9217                 if (chk->rec.chunk_id.id == SCTP_SHUTDOWN) {
9218                         /* We already have a SHUTDOWN queued. Reuse it. */
9219                         if (chk->whoTo) {
9220                                 sctp_free_remote_addr(chk->whoTo);
9221                                 chk->whoTo = NULL;
9222                         }
9223                         break;
9224                 }
9225         }
9226         if (chk == NULL) {
9227                 m_shutdown = sctp_get_mbuf_for_msg(sizeof(struct sctp_shutdown_chunk), 0, M_NOWAIT, 1, MT_HEADER);
9228                 if (m_shutdown == NULL) {
9229                         /* no mbuf's */
9230                         return;
9231                 }
9232                 SCTP_BUF_RESV_UF(m_shutdown, SCTP_MIN_OVERHEAD);
9233                 sctp_alloc_a_chunk(stcb, chk);
9234                 if (chk == NULL) {
9235                         /* no memory */
9236                         sctp_m_freem(m_shutdown);
9237                         return;
9238                 }
9239                 chk->copy_by_ref = 0;
9240                 chk->rec.chunk_id.id = SCTP_SHUTDOWN;
9241                 chk->rec.chunk_id.can_take_data = 1;
9242                 chk->flags = 0;
9243                 chk->send_size = sizeof(struct sctp_shutdown_chunk);
9244                 chk->sent = SCTP_DATAGRAM_UNSENT;
9245                 chk->snd_count = 0;
9246                 chk->flags = 0;
9247                 chk->asoc = &stcb->asoc;
9248                 chk->data = m_shutdown;
9249                 chk->whoTo = net;
9250                 if (chk->whoTo) {
9251                         atomic_add_int(&chk->whoTo->ref_count, 1);
9252                 }
9253                 shutdown_cp = mtod(m_shutdown, struct sctp_shutdown_chunk *);
9254                 shutdown_cp->ch.chunk_type = SCTP_SHUTDOWN;
9255                 shutdown_cp->ch.chunk_flags = 0;
9256                 shutdown_cp->ch.chunk_length = htons(chk->send_size);
9257                 shutdown_cp->cumulative_tsn_ack = htonl(stcb->asoc.cumulative_tsn);
9258                 SCTP_BUF_LEN(m_shutdown) = chk->send_size;
9259                 TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9260                 chk->asoc->ctrl_queue_cnt++;
9261         } else {
9262                 TAILQ_REMOVE(&stcb->asoc.control_send_queue, chk, sctp_next);
9263                 chk->whoTo = net;
9264                 if (chk->whoTo) {
9265                         atomic_add_int(&chk->whoTo->ref_count, 1);
9266                 }
9267                 shutdown_cp = mtod(chk->data, struct sctp_shutdown_chunk *);
9268                 shutdown_cp->cumulative_tsn_ack = htonl(stcb->asoc.cumulative_tsn);
9269                 TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
9270         }
9271         return;
9272 }
9273
9274 void
9275 sctp_send_asconf(struct sctp_tcb *stcb, struct sctp_nets *net, int addr_locked)
9276 {
9277         /*
9278          * formulate and queue an ASCONF to the peer. ASCONF parameters
9279          * should be queued on the assoc queue.
9280          */
9281         struct sctp_tmit_chunk *chk;
9282         struct mbuf *m_asconf;
9283         int len;
9284
9285         SCTP_TCB_LOCK_ASSERT(stcb);
9286
9287         if ((!TAILQ_EMPTY(&stcb->asoc.asconf_send_queue)) &&
9288             (!sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_MULTIPLE_ASCONFS))) {
9289                 /* can't send a new one if there is one in flight already */
9290                 return;
9291         }
9292
9293         /* compose an ASCONF chunk, maximum length is PMTU */
9294         m_asconf = sctp_compose_asconf(stcb, &len, addr_locked);
9295         if (m_asconf == NULL) {
9296                 return;
9297         }
9298
9299         sctp_alloc_a_chunk(stcb, chk);
9300         if (chk == NULL) {
9301                 /* no memory */
9302                 sctp_m_freem(m_asconf);
9303                 return;
9304         }
9305
9306         chk->copy_by_ref = 0;
9307         chk->rec.chunk_id.id = SCTP_ASCONF;
9308         chk->rec.chunk_id.can_take_data = 0;
9309         chk->flags = CHUNK_FLAGS_FRAGMENT_OK;
9310         chk->data = m_asconf;
9311         chk->send_size = len;
9312         chk->sent = SCTP_DATAGRAM_UNSENT;
9313         chk->snd_count = 0;
9314         chk->asoc = &stcb->asoc;
9315         chk->whoTo = net;
9316         if (chk->whoTo) {
9317                 atomic_add_int(&chk->whoTo->ref_count, 1);
9318         }
9319         TAILQ_INSERT_TAIL(&chk->asoc->asconf_send_queue, chk, sctp_next);
9320         chk->asoc->ctrl_queue_cnt++;
9321         return;
9322 }
9323
9324 void
9325 sctp_send_asconf_ack(struct sctp_tcb *stcb)
9326 {
9327         /*
9328          * formulate and queue a asconf-ack back to sender. the asconf-ack
9329          * must be stored in the tcb.
9330          */
9331         struct sctp_tmit_chunk *chk;
9332         struct sctp_asconf_ack *ack, *latest_ack;
9333         struct mbuf *m_ack;
9334         struct sctp_nets *net = NULL;
9335
9336         SCTP_TCB_LOCK_ASSERT(stcb);
9337         /* Get the latest ASCONF-ACK */
9338         latest_ack = TAILQ_LAST(&stcb->asoc.asconf_ack_sent, sctp_asconf_ackhead);
9339         if (latest_ack == NULL) {
9340                 return;
9341         }
9342         if (latest_ack->last_sent_to != NULL &&
9343             latest_ack->last_sent_to == stcb->asoc.last_control_chunk_from) {
9344                 /* we're doing a retransmission */
9345                 net = sctp_find_alternate_net(stcb, stcb->asoc.last_control_chunk_from, 0);
9346                 if (net == NULL) {
9347                         /* no alternate */
9348                         if (stcb->asoc.last_control_chunk_from == NULL) {
9349                                 if (stcb->asoc.alternate) {
9350                                         net = stcb->asoc.alternate;
9351                                 } else {
9352                                         net = stcb->asoc.primary_destination;
9353                                 }
9354                         } else {
9355                                 net = stcb->asoc.last_control_chunk_from;
9356                         }
9357                 }
9358         } else {
9359                 /* normal case */
9360                 if (stcb->asoc.last_control_chunk_from == NULL) {
9361                         if (stcb->asoc.alternate) {
9362                                 net = stcb->asoc.alternate;
9363                         } else {
9364                                 net = stcb->asoc.primary_destination;
9365                         }
9366                 } else {
9367                         net = stcb->asoc.last_control_chunk_from;
9368                 }
9369         }
9370         latest_ack->last_sent_to = net;
9371
9372         TAILQ_FOREACH(ack, &stcb->asoc.asconf_ack_sent, next) {
9373                 if (ack->data == NULL) {
9374                         continue;
9375                 }
9376
9377                 /* copy the asconf_ack */
9378                 m_ack = SCTP_M_COPYM(ack->data, 0, M_COPYALL, M_NOWAIT);
9379                 if (m_ack == NULL) {
9380                         /* couldn't copy it */
9381                         return;
9382                 }
9383 #ifdef SCTP_MBUF_LOGGING
9384                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
9385                         sctp_log_mbc(m_ack, SCTP_MBUF_ICOPY);
9386                 }
9387 #endif
9388
9389                 sctp_alloc_a_chunk(stcb, chk);
9390                 if (chk == NULL) {
9391                         /* no memory */
9392                         if (m_ack)
9393                                 sctp_m_freem(m_ack);
9394                         return;
9395                 }
9396                 chk->copy_by_ref = 0;
9397                 chk->rec.chunk_id.id = SCTP_ASCONF_ACK;
9398                 chk->rec.chunk_id.can_take_data = 1;
9399                 chk->flags = CHUNK_FLAGS_FRAGMENT_OK;
9400                 chk->whoTo = net;
9401                 if (chk->whoTo) {
9402                         atomic_add_int(&chk->whoTo->ref_count, 1);
9403                 }
9404                 chk->data = m_ack;
9405                 chk->send_size = ack->len;
9406                 chk->sent = SCTP_DATAGRAM_UNSENT;
9407                 chk->snd_count = 0;
9408                 chk->asoc = &stcb->asoc;
9409
9410                 TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9411                 chk->asoc->ctrl_queue_cnt++;
9412         }
9413         return;
9414 }
9415
9416
9417 static int
9418 sctp_chunk_retransmission(struct sctp_inpcb *inp,
9419     struct sctp_tcb *stcb,
9420     struct sctp_association *asoc,
9421     int *cnt_out, struct timeval *now, int *now_filled, int *fr_done, int so_locked
9422 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
9423     SCTP_UNUSED
9424 #endif
9425 )
9426 {
9427         /*-
9428          * send out one MTU of retransmission. If fast_retransmit is
9429          * happening we ignore the cwnd. Otherwise we obey the cwnd and
9430          * rwnd. For a Cookie or Asconf in the control chunk queue we
9431          * retransmit them by themselves.
9432          *
9433          * For data chunks we will pick out the lowest TSN's in the sent_queue
9434          * marked for resend and bundle them all together (up to a MTU of
9435          * destination). The address to send to should have been
9436          * selected/changed where the retransmission was marked (i.e. in FR
9437          * or t3-timeout routines).
9438          */
9439         struct sctp_tmit_chunk *data_list[SCTP_MAX_DATA_BUNDLING];
9440         struct sctp_tmit_chunk *chk, *fwd;
9441         struct mbuf *m, *endofchain;
9442         struct sctp_nets *net = NULL;
9443         uint32_t tsns_sent = 0;
9444         int no_fragmentflg, bundle_at, cnt_thru;
9445         unsigned int mtu;
9446         int error, i, one_chunk, fwd_tsn, ctl_cnt, tmr_started;
9447         struct sctp_auth_chunk *auth = NULL;
9448         uint32_t auth_offset = 0;
9449         uint16_t auth_keyid;
9450         int override_ok = 1;
9451         int data_auth_reqd = 0;
9452         uint32_t dmtu = 0;
9453
9454         SCTP_TCB_LOCK_ASSERT(stcb);
9455         tmr_started = ctl_cnt = bundle_at = error = 0;
9456         no_fragmentflg = 1;
9457         fwd_tsn = 0;
9458         *cnt_out = 0;
9459         fwd = NULL;
9460         endofchain = m = NULL;
9461         auth_keyid = stcb->asoc.authinfo.active_keyid;
9462 #ifdef SCTP_AUDITING_ENABLED
9463         sctp_audit_log(0xC3, 1);
9464 #endif
9465         if ((TAILQ_EMPTY(&asoc->sent_queue)) &&
9466             (TAILQ_EMPTY(&asoc->control_send_queue))) {
9467                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "SCTP hits empty queue with cnt set to %d?\n",
9468                     asoc->sent_queue_retran_cnt);
9469                 asoc->sent_queue_cnt = 0;
9470                 asoc->sent_queue_cnt_removeable = 0;
9471                 /* send back 0/0 so we enter normal transmission */
9472                 *cnt_out = 0;
9473                 return (0);
9474         }
9475         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
9476                 if ((chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) ||
9477                     (chk->rec.chunk_id.id == SCTP_STREAM_RESET) ||
9478                     (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN)) {
9479                         if (chk->sent != SCTP_DATAGRAM_RESEND) {
9480                                 continue;
9481                         }
9482                         if (chk->rec.chunk_id.id == SCTP_STREAM_RESET) {
9483                                 if (chk != asoc->str_reset) {
9484                                         /*
9485                                          * not eligible for retran if its
9486                                          * not ours
9487                                          */
9488                                         continue;
9489                                 }
9490                         }
9491                         ctl_cnt++;
9492                         if (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN) {
9493                                 fwd_tsn = 1;
9494                         }
9495                         /*
9496                          * Add an AUTH chunk, if chunk requires it save the
9497                          * offset into the chain for AUTH
9498                          */
9499                         if ((auth == NULL) &&
9500                             (sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
9501                             stcb->asoc.peer_auth_chunks))) {
9502                                 m = sctp_add_auth_chunk(m, &endofchain,
9503                                     &auth, &auth_offset,
9504                                     stcb,
9505                                     chk->rec.chunk_id.id);
9506                                 SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
9507                         }
9508                         m = sctp_copy_mbufchain(chk->data, m, &endofchain, 0, chk->send_size, chk->copy_by_ref);
9509                         break;
9510                 }
9511         }
9512         one_chunk = 0;
9513         cnt_thru = 0;
9514         /* do we have control chunks to retransmit? */
9515         if (m != NULL) {
9516                 /* Start a timer no matter if we succeed or fail */
9517                 if (chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
9518                         sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, inp, stcb, chk->whoTo);
9519                 } else if (chk->rec.chunk_id.id == SCTP_ASCONF)
9520                         sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp, stcb, chk->whoTo);
9521                 chk->snd_count++;       /* update our count */
9522                 if ((error = sctp_lowlevel_chunk_output(inp, stcb, chk->whoTo,
9523                     (struct sockaddr *)&chk->whoTo->ro._l_addr, m,
9524                     auth_offset, auth, stcb->asoc.authinfo.active_keyid,
9525                     no_fragmentflg, 0, 0,
9526                     inp->sctp_lport, stcb->rport, htonl(stcb->asoc.peer_vtag),
9527                     chk->whoTo->port, NULL,
9528                     0, 0,
9529                     so_locked))) {
9530                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
9531                         if (error == ENOBUFS) {
9532                                 asoc->ifp_had_enobuf = 1;
9533                                 SCTP_STAT_INCR(sctps_lowlevelerr);
9534                         }
9535                         return (error);
9536                 } else {
9537                         asoc->ifp_had_enobuf = 0;
9538                 }
9539                 endofchain = NULL;
9540                 auth = NULL;
9541                 auth_offset = 0;
9542                 /*
9543                  * We don't want to mark the net->sent time here since this
9544                  * we use this for HB and retrans cannot measure RTT
9545                  */
9546                 /* (void)SCTP_GETTIME_TIMEVAL(&chk->whoTo->last_sent_time); */
9547                 *cnt_out += 1;
9548                 chk->sent = SCTP_DATAGRAM_SENT;
9549                 sctp_ucount_decr(stcb->asoc.sent_queue_retran_cnt);
9550                 if (fwd_tsn == 0) {
9551                         return (0);
9552                 } else {
9553                         /* Clean up the fwd-tsn list */
9554                         sctp_clean_up_ctl(stcb, asoc, so_locked);
9555                         return (0);
9556                 }
9557         }
9558         /*
9559          * Ok, it is just data retransmission we need to do or that and a
9560          * fwd-tsn with it all.
9561          */
9562         if (TAILQ_EMPTY(&asoc->sent_queue)) {
9563                 return (SCTP_RETRAN_DONE);
9564         }
9565         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED) ||
9566             (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT)) {
9567                 /* not yet open, resend the cookie and that is it */
9568                 return (1);
9569         }
9570 #ifdef SCTP_AUDITING_ENABLED
9571         sctp_auditing(20, inp, stcb, NULL);
9572 #endif
9573         data_auth_reqd = sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks);
9574         TAILQ_FOREACH(chk, &asoc->sent_queue, sctp_next) {
9575                 if (chk->sent != SCTP_DATAGRAM_RESEND) {
9576                         /* No, not sent to this net or not ready for rtx */
9577                         continue;
9578                 }
9579                 if (chk->data == NULL) {
9580                         SCTP_PRINTF("TSN:%x chk->snd_count:%d chk->sent:%d can't retran - no data\n",
9581                             chk->rec.data.tsn, chk->snd_count, chk->sent);
9582                         continue;
9583                 }
9584                 if ((SCTP_BASE_SYSCTL(sctp_max_retran_chunk)) &&
9585                     (chk->snd_count >= SCTP_BASE_SYSCTL(sctp_max_retran_chunk))) {
9586                         struct mbuf *op_err;
9587                         char msg[SCTP_DIAG_INFO_LEN];
9588
9589                         snprintf(msg, sizeof(msg), "TSN %8.8x retransmitted %d times, giving up",
9590                             chk->rec.data.tsn, chk->snd_count);
9591                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
9592                             msg);
9593                         atomic_add_int(&stcb->asoc.refcnt, 1);
9594                         sctp_abort_an_association(stcb->sctp_ep, stcb, op_err,
9595                             so_locked);
9596                         SCTP_TCB_LOCK(stcb);
9597                         atomic_subtract_int(&stcb->asoc.refcnt, 1);
9598                         return (SCTP_RETRAN_EXIT);
9599                 }
9600                 /* pick up the net */
9601                 net = chk->whoTo;
9602                 switch (net->ro._l_addr.sa.sa_family) {
9603 #ifdef INET
9604                 case AF_INET:
9605                         mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
9606                         break;
9607 #endif
9608 #ifdef INET6
9609                 case AF_INET6:
9610                         mtu = net->mtu - SCTP_MIN_OVERHEAD;
9611                         break;
9612 #endif
9613                 default:
9614                         /* TSNH */
9615                         mtu = net->mtu;
9616                         break;
9617                 }
9618
9619                 if ((asoc->peers_rwnd < mtu) && (asoc->total_flight > 0)) {
9620                         /* No room in peers rwnd */
9621                         uint32_t tsn;
9622
9623                         tsn = asoc->last_acked_seq + 1;
9624                         if (tsn == chk->rec.data.tsn) {
9625                                 /*
9626                                  * we make a special exception for this
9627                                  * case. The peer has no rwnd but is missing
9628                                  * the lowest chunk.. which is probably what
9629                                  * is holding up the rwnd.
9630                                  */
9631                                 goto one_chunk_around;
9632                         }
9633                         return (1);
9634                 }
9635 one_chunk_around:
9636                 if (asoc->peers_rwnd < mtu) {
9637                         one_chunk = 1;
9638                         if ((asoc->peers_rwnd == 0) &&
9639                             (asoc->total_flight == 0)) {
9640                                 chk->window_probe = 1;
9641                                 chk->whoTo->window_probe = 1;
9642                         }
9643                 }
9644 #ifdef SCTP_AUDITING_ENABLED
9645                 sctp_audit_log(0xC3, 2);
9646 #endif
9647                 bundle_at = 0;
9648                 m = NULL;
9649                 net->fast_retran_ip = 0;
9650                 if (chk->rec.data.doing_fast_retransmit == 0) {
9651                         /*
9652                          * if no FR in progress skip destination that have
9653                          * flight_size > cwnd.
9654                          */
9655                         if (net->flight_size >= net->cwnd) {
9656                                 continue;
9657                         }
9658                 } else {
9659                         /*
9660                          * Mark the destination net to have FR recovery
9661                          * limits put on it.
9662                          */
9663                         *fr_done = 1;
9664                         net->fast_retran_ip = 1;
9665                 }
9666
9667                 /*
9668                  * if no AUTH is yet included and this chunk requires it,
9669                  * make sure to account for it.  We don't apply the size
9670                  * until the AUTH chunk is actually added below in case
9671                  * there is no room for this chunk.
9672                  */
9673                 if (data_auth_reqd && (auth == NULL)) {
9674                         dmtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
9675                 } else
9676                         dmtu = 0;
9677
9678                 if ((chk->send_size <= (mtu - dmtu)) ||
9679                     (chk->flags & CHUNK_FLAGS_FRAGMENT_OK)) {
9680                         /* ok we will add this one */
9681                         if (data_auth_reqd) {
9682                                 if (auth == NULL) {
9683                                         m = sctp_add_auth_chunk(m,
9684                                             &endofchain,
9685                                             &auth,
9686                                             &auth_offset,
9687                                             stcb,
9688                                             SCTP_DATA);
9689                                         auth_keyid = chk->auth_keyid;
9690                                         override_ok = 0;
9691                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
9692                                 } else if (override_ok) {
9693                                         auth_keyid = chk->auth_keyid;
9694                                         override_ok = 0;
9695                                 } else if (chk->auth_keyid != auth_keyid) {
9696                                         /* different keyid, so done bundling */
9697                                         break;
9698                                 }
9699                         }
9700                         m = sctp_copy_mbufchain(chk->data, m, &endofchain, 0, chk->send_size, chk->copy_by_ref);
9701                         if (m == NULL) {
9702                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
9703                                 return (ENOMEM);
9704                         }
9705                         /* Do clear IP_DF ? */
9706                         if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
9707                                 no_fragmentflg = 0;
9708                         }
9709                         /* upate our MTU size */
9710                         if (mtu > (chk->send_size + dmtu))
9711                                 mtu -= (chk->send_size + dmtu);
9712                         else
9713                                 mtu = 0;
9714                         data_list[bundle_at++] = chk;
9715                         if (one_chunk && (asoc->total_flight <= 0)) {
9716                                 SCTP_STAT_INCR(sctps_windowprobed);
9717                         }
9718                 }
9719                 if (one_chunk == 0) {
9720                         /*
9721                          * now are there anymore forward from chk to pick
9722                          * up?
9723                          */
9724                         for (fwd = TAILQ_NEXT(chk, sctp_next); fwd != NULL; fwd = TAILQ_NEXT(fwd, sctp_next)) {
9725                                 if (fwd->sent != SCTP_DATAGRAM_RESEND) {
9726                                         /* Nope, not for retran */
9727                                         continue;
9728                                 }
9729                                 if (fwd->whoTo != net) {
9730                                         /* Nope, not the net in question */
9731                                         continue;
9732                                 }
9733                                 if (data_auth_reqd && (auth == NULL)) {
9734                                         dmtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
9735                                 } else
9736                                         dmtu = 0;
9737                                 if (fwd->send_size <= (mtu - dmtu)) {
9738                                         if (data_auth_reqd) {
9739                                                 if (auth == NULL) {
9740                                                         m = sctp_add_auth_chunk(m,
9741                                                             &endofchain,
9742                                                             &auth,
9743                                                             &auth_offset,
9744                                                             stcb,
9745                                                             SCTP_DATA);
9746                                                         auth_keyid = fwd->auth_keyid;
9747                                                         override_ok = 0;
9748                                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
9749                                                 } else if (override_ok) {
9750                                                         auth_keyid = fwd->auth_keyid;
9751                                                         override_ok = 0;
9752                                                 } else if (fwd->auth_keyid != auth_keyid) {
9753                                                         /*
9754                                                          * different keyid,
9755                                                          * so done bundling
9756                                                          */
9757                                                         break;
9758                                                 }
9759                                         }
9760                                         m = sctp_copy_mbufchain(fwd->data, m, &endofchain, 0, fwd->send_size, fwd->copy_by_ref);
9761                                         if (m == NULL) {
9762                                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
9763                                                 return (ENOMEM);
9764                                         }
9765                                         /* Do clear IP_DF ? */
9766                                         if (fwd->flags & CHUNK_FLAGS_FRAGMENT_OK) {
9767                                                 no_fragmentflg = 0;
9768                                         }
9769                                         /* upate our MTU size */
9770                                         if (mtu > (fwd->send_size + dmtu))
9771                                                 mtu -= (fwd->send_size + dmtu);
9772                                         else
9773                                                 mtu = 0;
9774                                         data_list[bundle_at++] = fwd;
9775                                         if (bundle_at >= SCTP_MAX_DATA_BUNDLING) {
9776                                                 break;
9777                                         }
9778                                 } else {
9779                                         /* can't fit so we are done */
9780                                         break;
9781                                 }
9782                         }
9783                 }
9784                 /* Is there something to send for this destination? */
9785                 if (m) {
9786                         /*
9787                          * No matter if we fail/or succeed we should start a
9788                          * timer. A failure is like a lost IP packet :-)
9789                          */
9790                         if (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
9791                                 /*
9792                                  * no timer running on this destination
9793                                  * restart it.
9794                                  */
9795                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
9796                                 tmr_started = 1;
9797                         }
9798                         /* Now lets send it, if there is anything to send :> */
9799                         if ((error = sctp_lowlevel_chunk_output(inp, stcb, net,
9800                             (struct sockaddr *)&net->ro._l_addr, m,
9801                             auth_offset, auth, auth_keyid,
9802                             no_fragmentflg, 0, 0,
9803                             inp->sctp_lport, stcb->rport, htonl(stcb->asoc.peer_vtag),
9804                             net->port, NULL,
9805                             0, 0,
9806                             so_locked))) {
9807                                 /* error, we could not output */
9808                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
9809                                 if (error == ENOBUFS) {
9810                                         asoc->ifp_had_enobuf = 1;
9811                                         SCTP_STAT_INCR(sctps_lowlevelerr);
9812                                 }
9813                                 return (error);
9814                         } else {
9815                                 asoc->ifp_had_enobuf = 0;
9816                         }
9817                         endofchain = NULL;
9818                         auth = NULL;
9819                         auth_offset = 0;
9820                         /* For HB's */
9821                         /*
9822                          * We don't want to mark the net->sent time here
9823                          * since this we use this for HB and retrans cannot
9824                          * measure RTT
9825                          */
9826                         /* (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time); */
9827
9828                         /* For auto-close */
9829                         cnt_thru++;
9830                         if (*now_filled == 0) {
9831                                 (void)SCTP_GETTIME_TIMEVAL(&asoc->time_last_sent);
9832                                 *now = asoc->time_last_sent;
9833                                 *now_filled = 1;
9834                         } else {
9835                                 asoc->time_last_sent = *now;
9836                         }
9837                         *cnt_out += bundle_at;
9838 #ifdef SCTP_AUDITING_ENABLED
9839                         sctp_audit_log(0xC4, bundle_at);
9840 #endif
9841                         if (bundle_at) {
9842                                 tsns_sent = data_list[0]->rec.data.tsn;
9843                         }
9844                         for (i = 0; i < bundle_at; i++) {
9845                                 SCTP_STAT_INCR(sctps_sendretransdata);
9846                                 data_list[i]->sent = SCTP_DATAGRAM_SENT;
9847                                 /*
9848                                  * When we have a revoked data, and we
9849                                  * retransmit it, then we clear the revoked
9850                                  * flag since this flag dictates if we
9851                                  * subtracted from the fs
9852                                  */
9853                                 if (data_list[i]->rec.data.chunk_was_revoked) {
9854                                         /* Deflate the cwnd */
9855                                         data_list[i]->whoTo->cwnd -= data_list[i]->book_size;
9856                                         data_list[i]->rec.data.chunk_was_revoked = 0;
9857                                 }
9858                                 data_list[i]->snd_count++;
9859                                 sctp_ucount_decr(asoc->sent_queue_retran_cnt);
9860                                 /* record the time */
9861                                 data_list[i]->sent_rcv_time = asoc->time_last_sent;
9862                                 if (data_list[i]->book_size_scale) {
9863                                         /*
9864                                          * need to double the book size on
9865                                          * this one
9866                                          */
9867                                         data_list[i]->book_size_scale = 0;
9868                                         /*
9869                                          * Since we double the booksize, we
9870                                          * must also double the output queue
9871                                          * size, since this get shrunk when
9872                                          * we free by this amount.
9873                                          */
9874                                         atomic_add_int(&((asoc)->total_output_queue_size), data_list[i]->book_size);
9875                                         data_list[i]->book_size *= 2;
9876
9877
9878                                 } else {
9879                                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_RWND_ENABLE) {
9880                                                 sctp_log_rwnd(SCTP_DECREASE_PEER_RWND,
9881                                                     asoc->peers_rwnd, data_list[i]->send_size, SCTP_BASE_SYSCTL(sctp_peer_chunk_oh));
9882                                         }
9883                                         asoc->peers_rwnd = sctp_sbspace_sub(asoc->peers_rwnd,
9884                                             (uint32_t) (data_list[i]->send_size +
9885                                             SCTP_BASE_SYSCTL(sctp_peer_chunk_oh)));
9886                                 }
9887                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
9888                                         sctp_misc_ints(SCTP_FLIGHT_LOG_UP_RSND,
9889                                             data_list[i]->whoTo->flight_size,
9890                                             data_list[i]->book_size,
9891                                             (uint32_t) (uintptr_t) data_list[i]->whoTo,
9892                                             data_list[i]->rec.data.tsn);
9893                                 }
9894                                 sctp_flight_size_increase(data_list[i]);
9895                                 sctp_total_flight_increase(stcb, data_list[i]);
9896                                 if (asoc->peers_rwnd < stcb->sctp_ep->sctp_ep.sctp_sws_sender) {
9897                                         /* SWS sender side engages */
9898                                         asoc->peers_rwnd = 0;
9899                                 }
9900                                 if ((i == 0) &&
9901                                     (data_list[i]->rec.data.doing_fast_retransmit)) {
9902                                         SCTP_STAT_INCR(sctps_sendfastretrans);
9903                                         if ((data_list[i] == TAILQ_FIRST(&asoc->sent_queue)) &&
9904                                             (tmr_started == 0)) {
9905                                                 /*-
9906                                                  * ok we just fast-retrans'd
9907                                                  * the lowest TSN, i.e the
9908                                                  * first on the list. In
9909                                                  * this case we want to give
9910                                                  * some more time to get a
9911                                                  * SACK back without a
9912                                                  * t3-expiring.
9913                                                  */
9914                                                 sctp_timer_stop(SCTP_TIMER_TYPE_SEND, inp, stcb, net,
9915                                                     SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_2);
9916                                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
9917                                         }
9918                                 }
9919                         }
9920                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
9921                                 sctp_log_cwnd(stcb, net, tsns_sent, SCTP_CWND_LOG_FROM_RESEND);
9922                         }
9923 #ifdef SCTP_AUDITING_ENABLED
9924                         sctp_auditing(21, inp, stcb, NULL);
9925 #endif
9926                 } else {
9927                         /* None will fit */
9928                         return (1);
9929                 }
9930                 if (asoc->sent_queue_retran_cnt <= 0) {
9931                         /* all done we have no more to retran */
9932                         asoc->sent_queue_retran_cnt = 0;
9933                         break;
9934                 }
9935                 if (one_chunk) {
9936                         /* No more room in rwnd */
9937                         return (1);
9938                 }
9939                 /* stop the for loop here. we sent out a packet */
9940                 break;
9941         }
9942         return (0);
9943 }
9944
9945 static void
9946 sctp_timer_validation(struct sctp_inpcb *inp,
9947     struct sctp_tcb *stcb,
9948     struct sctp_association *asoc)
9949 {
9950         struct sctp_nets *net;
9951
9952         /* Validate that a timer is running somewhere */
9953         TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
9954                 if (SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
9955                         /* Here is a timer */
9956                         return;
9957                 }
9958         }
9959         SCTP_TCB_LOCK_ASSERT(stcb);
9960         /* Gak, we did not have a timer somewhere */
9961         SCTPDBG(SCTP_DEBUG_OUTPUT3, "Deadlock avoided starting timer on a dest at retran\n");
9962         if (asoc->alternate) {
9963                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, asoc->alternate);
9964         } else {
9965                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, asoc->primary_destination);
9966         }
9967         return;
9968 }
9969
9970 void
9971 sctp_chunk_output(struct sctp_inpcb *inp,
9972     struct sctp_tcb *stcb,
9973     int from_where,
9974     int so_locked
9975 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
9976     SCTP_UNUSED
9977 #endif
9978 )
9979 {
9980         /*-
9981          * Ok this is the generic chunk service queue. we must do the
9982          * following:
9983          * - See if there are retransmits pending, if so we must
9984          *   do these first.
9985          * - Service the stream queue that is next, moving any
9986          *   message (note I must get a complete message i.e.
9987          *   FIRST/MIDDLE and LAST to the out queue in one pass) and assigning
9988          *   TSN's
9989          * - Check to see if the cwnd/rwnd allows any output, if so we
9990          *   go ahead and fomulate and send the low level chunks. Making sure
9991          *   to combine any control in the control chunk queue also.
9992          */
9993         struct sctp_association *asoc;
9994         struct sctp_nets *net;
9995         int error = 0, num_out, tot_out = 0, ret = 0, reason_code;
9996         unsigned int burst_cnt = 0;
9997         struct timeval now;
9998         int now_filled = 0;
9999         int nagle_on;
10000         int frag_point = sctp_get_frag_point(stcb, &stcb->asoc);
10001         int un_sent = 0;
10002         int fr_done;
10003         unsigned int tot_frs = 0;
10004
10005         asoc = &stcb->asoc;
10006 do_it_again:
10007         /* The Nagle algorithm is only applied when handling a send call. */
10008         if (from_where == SCTP_OUTPUT_FROM_USR_SEND) {
10009                 if (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_NODELAY)) {
10010                         nagle_on = 0;
10011                 } else {
10012                         nagle_on = 1;
10013                 }
10014         } else {
10015                 nagle_on = 0;
10016         }
10017         SCTP_TCB_LOCK_ASSERT(stcb);
10018
10019         un_sent = (stcb->asoc.total_output_queue_size - stcb->asoc.total_flight);
10020
10021         if ((un_sent <= 0) &&
10022             (TAILQ_EMPTY(&asoc->control_send_queue)) &&
10023             (TAILQ_EMPTY(&asoc->asconf_send_queue)) &&
10024             (asoc->sent_queue_retran_cnt == 0) &&
10025             (asoc->trigger_reset == 0)) {
10026                 /* Nothing to do unless there is something to be sent left */
10027                 return;
10028         }
10029         /*
10030          * Do we have something to send, data or control AND a sack timer
10031          * running, if so piggy-back the sack.
10032          */
10033         if (SCTP_OS_TIMER_PENDING(&stcb->asoc.dack_timer.timer)) {
10034                 sctp_send_sack(stcb, so_locked);
10035                 (void)SCTP_OS_TIMER_STOP(&stcb->asoc.dack_timer.timer);
10036         }
10037         while (asoc->sent_queue_retran_cnt) {
10038                 /*-
10039                  * Ok, it is retransmission time only, we send out only ONE
10040                  * packet with a single call off to the retran code.
10041                  */
10042                 if (from_where == SCTP_OUTPUT_FROM_COOKIE_ACK) {
10043                         /*-
10044                          * Special hook for handling cookiess discarded
10045                          * by peer that carried data. Send cookie-ack only
10046                          * and then the next call with get the retran's.
10047                          */
10048                         (void)sctp_med_chunk_output(inp, stcb, asoc, &num_out, &reason_code, 1,
10049                             from_where,
10050                             &now, &now_filled, frag_point, so_locked);
10051                         return;
10052                 } else if (from_where != SCTP_OUTPUT_FROM_HB_TMR) {
10053                         /* if its not from a HB then do it */
10054                         fr_done = 0;
10055                         ret = sctp_chunk_retransmission(inp, stcb, asoc, &num_out, &now, &now_filled, &fr_done, so_locked);
10056                         if (fr_done) {
10057                                 tot_frs++;
10058                         }
10059                 } else {
10060                         /*
10061                          * its from any other place, we don't allow retran
10062                          * output (only control)
10063                          */
10064                         ret = 1;
10065                 }
10066                 if (ret > 0) {
10067                         /* Can't send anymore */
10068                         /*-
10069                          * now lets push out control by calling med-level
10070                          * output once. this assures that we WILL send HB's
10071                          * if queued too.
10072                          */
10073                         (void)sctp_med_chunk_output(inp, stcb, asoc, &num_out, &reason_code, 1,
10074                             from_where,
10075                             &now, &now_filled, frag_point, so_locked);
10076 #ifdef SCTP_AUDITING_ENABLED
10077                         sctp_auditing(8, inp, stcb, NULL);
10078 #endif
10079                         sctp_timer_validation(inp, stcb, asoc);
10080                         return;
10081                 }
10082                 if (ret < 0) {
10083                         /*-
10084                          * The count was off.. retran is not happening so do
10085                          * the normal retransmission.
10086                          */
10087 #ifdef SCTP_AUDITING_ENABLED
10088                         sctp_auditing(9, inp, stcb, NULL);
10089 #endif
10090                         if (ret == SCTP_RETRAN_EXIT) {
10091                                 return;
10092                         }
10093                         break;
10094                 }
10095                 if (from_where == SCTP_OUTPUT_FROM_T3) {
10096                         /* Only one transmission allowed out of a timeout */
10097 #ifdef SCTP_AUDITING_ENABLED
10098                         sctp_auditing(10, inp, stcb, NULL);
10099 #endif
10100                         /* Push out any control */
10101                         (void)sctp_med_chunk_output(inp, stcb, asoc, &num_out, &reason_code, 1, from_where,
10102                             &now, &now_filled, frag_point, so_locked);
10103                         return;
10104                 }
10105                 if ((asoc->fr_max_burst > 0) && (tot_frs >= asoc->fr_max_burst)) {
10106                         /* Hit FR burst limit */
10107                         return;
10108                 }
10109                 if ((num_out == 0) && (ret == 0)) {
10110                         /* No more retrans to send */
10111                         break;
10112                 }
10113         }
10114 #ifdef SCTP_AUDITING_ENABLED
10115         sctp_auditing(12, inp, stcb, NULL);
10116 #endif
10117         /* Check for bad destinations, if they exist move chunks around. */
10118         TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
10119                 if (!(net->dest_state & SCTP_ADDR_REACHABLE)) {
10120                         /*-
10121                          * if possible move things off of this address we
10122                          * still may send below due to the dormant state but
10123                          * we try to find an alternate address to send to
10124                          * and if we have one we move all queued data on the
10125                          * out wheel to this alternate address.
10126                          */
10127                         if (net->ref_count > 1)
10128                                 sctp_move_chunks_from_net(stcb, net);
10129                 } else {
10130                         /*-
10131                          * if ((asoc->sat_network) || (net->addr_is_local))
10132                          * { burst_limit = asoc->max_burst *
10133                          * SCTP_SAT_NETWORK_BURST_INCR; }
10134                          */
10135                         if (asoc->max_burst > 0) {
10136                                 if (SCTP_BASE_SYSCTL(sctp_use_cwnd_based_maxburst)) {
10137                                         if ((net->flight_size + (asoc->max_burst * net->mtu)) < net->cwnd) {
10138                                                 /*
10139                                                  * JRS - Use the congestion
10140                                                  * control given in the
10141                                                  * congestion control module
10142                                                  */
10143                                                 asoc->cc_functions.sctp_cwnd_update_after_output(stcb, net, asoc->max_burst);
10144                                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_MAXBURST_ENABLE) {
10145                                                         sctp_log_maxburst(stcb, net, 0, asoc->max_burst, SCTP_MAX_BURST_APPLIED);
10146                                                 }
10147                                                 SCTP_STAT_INCR(sctps_maxburstqueued);
10148                                         }
10149                                         net->fast_retran_ip = 0;
10150                                 } else {
10151                                         if (net->flight_size == 0) {
10152                                                 /*
10153                                                  * Should be decaying the
10154                                                  * cwnd here
10155                                                  */
10156                                                 ;
10157                                         }
10158                                 }
10159                         }
10160                 }
10161
10162         }
10163         burst_cnt = 0;
10164         do {
10165                 error = sctp_med_chunk_output(inp, stcb, asoc, &num_out,
10166                     &reason_code, 0, from_where,
10167                     &now, &now_filled, frag_point, so_locked);
10168                 if (error) {
10169                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Error %d was returned from med-c-op\n", error);
10170                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_MAXBURST_ENABLE) {
10171                                 sctp_log_maxburst(stcb, asoc->primary_destination, error, burst_cnt, SCTP_MAX_BURST_ERROR_STOP);
10172                         }
10173                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
10174                                 sctp_log_cwnd(stcb, NULL, error, SCTP_SEND_NOW_COMPLETES);
10175                                 sctp_log_cwnd(stcb, NULL, 0xdeadbeef, SCTP_SEND_NOW_COMPLETES);
10176                         }
10177                         break;
10178                 }
10179                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "m-c-o put out %d\n", num_out);
10180
10181                 tot_out += num_out;
10182                 burst_cnt++;
10183                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
10184                         sctp_log_cwnd(stcb, NULL, num_out, SCTP_SEND_NOW_COMPLETES);
10185                         if (num_out == 0) {
10186                                 sctp_log_cwnd(stcb, NULL, reason_code, SCTP_SEND_NOW_COMPLETES);
10187                         }
10188                 }
10189                 if (nagle_on) {
10190                         /*
10191                          * When the Nagle algorithm is used, look at how
10192                          * much is unsent, then if its smaller than an MTU
10193                          * and we have data in flight we stop, except if we
10194                          * are handling a fragmented user message.
10195                          */
10196                         un_sent = stcb->asoc.total_output_queue_size - stcb->asoc.total_flight;
10197                         if ((un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD)) &&
10198                             (stcb->asoc.total_flight > 0)) {
10199 /*      &&                   sctp_is_feature_on(inp, SCTP_PCB_FLAGS_EXPLICIT_EOR))) {*/
10200                                 break;
10201                         }
10202                 }
10203                 if (TAILQ_EMPTY(&asoc->control_send_queue) &&
10204                     TAILQ_EMPTY(&asoc->send_queue) &&
10205                     sctp_is_there_unsent_data(stcb, so_locked) == 0) {
10206                         /* Nothing left to send */
10207                         break;
10208                 }
10209                 if ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) <= 0) {
10210                         /* Nothing left to send */
10211                         break;
10212                 }
10213         } while (num_out &&
10214             ((asoc->max_burst == 0) ||
10215             SCTP_BASE_SYSCTL(sctp_use_cwnd_based_maxburst) ||
10216             (burst_cnt < asoc->max_burst)));
10217
10218         if (SCTP_BASE_SYSCTL(sctp_use_cwnd_based_maxburst) == 0) {
10219                 if ((asoc->max_burst > 0) && (burst_cnt >= asoc->max_burst)) {
10220                         SCTP_STAT_INCR(sctps_maxburstqueued);
10221                         asoc->burst_limit_applied = 1;
10222                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_MAXBURST_ENABLE) {
10223                                 sctp_log_maxburst(stcb, asoc->primary_destination, 0, burst_cnt, SCTP_MAX_BURST_APPLIED);
10224                         }
10225                 } else {
10226                         asoc->burst_limit_applied = 0;
10227                 }
10228         }
10229         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
10230                 sctp_log_cwnd(stcb, NULL, tot_out, SCTP_SEND_NOW_COMPLETES);
10231         }
10232         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Ok, we have put out %d chunks\n",
10233             tot_out);
10234
10235         /*-
10236          * Now we need to clean up the control chunk chain if a ECNE is on
10237          * it. It must be marked as UNSENT again so next call will continue
10238          * to send it until such time that we get a CWR, to remove it.
10239          */
10240         if (stcb->asoc.ecn_echo_cnt_onq)
10241                 sctp_fix_ecn_echo(asoc);
10242
10243         if (stcb->asoc.trigger_reset) {
10244                 if (sctp_send_stream_reset_out_if_possible(stcb, so_locked) == 0) {
10245                         goto do_it_again;
10246                 }
10247         }
10248         return;
10249 }
10250
10251
10252 int
10253 sctp_output(
10254     struct sctp_inpcb *inp,
10255     struct mbuf *m,
10256     struct sockaddr *addr,
10257     struct mbuf *control,
10258     struct thread *p,
10259     int flags)
10260 {
10261         if (inp == NULL) {
10262                 SCTP_LTRACE_ERR_RET_PKT(m, inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
10263                 return (EINVAL);
10264         }
10265
10266         if (inp->sctp_socket == NULL) {
10267                 SCTP_LTRACE_ERR_RET_PKT(m, inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
10268                 return (EINVAL);
10269         }
10270         return (sctp_sosend(inp->sctp_socket,
10271             addr,
10272             (struct uio *)NULL,
10273             m,
10274             control,
10275             flags, p
10276             ));
10277 }
10278
10279 void
10280 send_forward_tsn(struct sctp_tcb *stcb,
10281     struct sctp_association *asoc)
10282 {
10283         struct sctp_tmit_chunk *chk, *at, *tp1, *last;
10284         struct sctp_forward_tsn_chunk *fwdtsn;
10285         struct sctp_strseq *strseq;
10286         struct sctp_strseq_mid *strseq_m;
10287         uint32_t advance_peer_ack_point;
10288         unsigned int cnt_of_space, i, ovh;
10289         unsigned int space_needed;
10290         unsigned int cnt_of_skipped = 0;
10291
10292         SCTP_TCB_LOCK_ASSERT(stcb);
10293         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
10294                 if (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN) {
10295                         /* mark it to unsent */
10296                         chk->sent = SCTP_DATAGRAM_UNSENT;
10297                         chk->snd_count = 0;
10298                         /* Do we correct its output location? */
10299                         if (chk->whoTo) {
10300                                 sctp_free_remote_addr(chk->whoTo);
10301                                 chk->whoTo = NULL;
10302                         }
10303                         goto sctp_fill_in_rest;
10304                 }
10305         }
10306         /* Ok if we reach here we must build one */
10307         sctp_alloc_a_chunk(stcb, chk);
10308         if (chk == NULL) {
10309                 return;
10310         }
10311         asoc->fwd_tsn_cnt++;
10312         chk->copy_by_ref = 0;
10313         /*
10314          * We don't do the old thing here since this is used not for on-wire
10315          * but to tell if we are sending a fwd-tsn by the stack during
10316          * output. And if its a IFORWARD or a FORWARD it is a fwd-tsn.
10317          */
10318         chk->rec.chunk_id.id = SCTP_FORWARD_CUM_TSN;
10319         chk->rec.chunk_id.can_take_data = 0;
10320         chk->flags = 0;
10321         chk->asoc = asoc;
10322         chk->whoTo = NULL;
10323         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
10324         if (chk->data == NULL) {
10325                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
10326                 return;
10327         }
10328         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
10329         chk->sent = SCTP_DATAGRAM_UNSENT;
10330         chk->snd_count = 0;
10331         TAILQ_INSERT_TAIL(&asoc->control_send_queue, chk, sctp_next);
10332         asoc->ctrl_queue_cnt++;
10333 sctp_fill_in_rest:
10334         /*-
10335          * Here we go through and fill out the part that deals with
10336          * stream/seq of the ones we skip.
10337          */
10338         SCTP_BUF_LEN(chk->data) = 0;
10339         TAILQ_FOREACH(at, &asoc->sent_queue, sctp_next) {
10340                 if ((at->sent != SCTP_FORWARD_TSN_SKIP) &&
10341                     (at->sent != SCTP_DATAGRAM_NR_ACKED)) {
10342                         /* no more to look at */
10343                         break;
10344                 }
10345                 if (!asoc->idata_supported && (at->rec.data.rcv_flags & SCTP_DATA_UNORDERED)) {
10346                         /* We don't report these */
10347                         continue;
10348                 }
10349                 cnt_of_skipped++;
10350         }
10351         if (asoc->idata_supported) {
10352                 space_needed = (sizeof(struct sctp_forward_tsn_chunk) +
10353                     (cnt_of_skipped * sizeof(struct sctp_strseq_mid)));
10354         } else {
10355                 space_needed = (sizeof(struct sctp_forward_tsn_chunk) +
10356                     (cnt_of_skipped * sizeof(struct sctp_strseq)));
10357         }
10358         cnt_of_space = (unsigned int)M_TRAILINGSPACE(chk->data);
10359
10360         if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
10361                 ovh = SCTP_MIN_OVERHEAD;
10362         } else {
10363                 ovh = SCTP_MIN_V4_OVERHEAD;
10364         }
10365         if (cnt_of_space > (asoc->smallest_mtu - ovh)) {
10366                 /* trim to a mtu size */
10367                 cnt_of_space = asoc->smallest_mtu - ovh;
10368         }
10369         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_TRY_ADVANCE) {
10370                 sctp_misc_ints(SCTP_FWD_TSN_CHECK,
10371                     0xff, 0, cnt_of_skipped,
10372                     asoc->advanced_peer_ack_point);
10373         }
10374         advance_peer_ack_point = asoc->advanced_peer_ack_point;
10375         if (cnt_of_space < space_needed) {
10376                 /*-
10377                  * ok we must trim down the chunk by lowering the
10378                  * advance peer ack point.
10379                  */
10380                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_TRY_ADVANCE) {
10381                         sctp_misc_ints(SCTP_FWD_TSN_CHECK,
10382                             0xff, 0xff, cnt_of_space,
10383                             space_needed);
10384                 }
10385                 cnt_of_skipped = cnt_of_space - sizeof(struct sctp_forward_tsn_chunk);
10386                 if (asoc->idata_supported) {
10387                         cnt_of_skipped /= sizeof(struct sctp_strseq_mid);
10388                 } else {
10389                         cnt_of_skipped /= sizeof(struct sctp_strseq);
10390                 }
10391                 /*-
10392                  * Go through and find the TSN that will be the one
10393                  * we report.
10394                  */
10395                 at = TAILQ_FIRST(&asoc->sent_queue);
10396                 if (at != NULL) {
10397                         for (i = 0; i < cnt_of_skipped; i++) {
10398                                 tp1 = TAILQ_NEXT(at, sctp_next);
10399                                 if (tp1 == NULL) {
10400                                         break;
10401                                 }
10402                                 at = tp1;
10403                         }
10404                 }
10405                 if (at && SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_TRY_ADVANCE) {
10406                         sctp_misc_ints(SCTP_FWD_TSN_CHECK,
10407                             0xff, cnt_of_skipped, at->rec.data.tsn,
10408                             asoc->advanced_peer_ack_point);
10409                 }
10410                 last = at;
10411                 /*-
10412                  * last now points to last one I can report, update
10413                  * peer ack point
10414                  */
10415                 if (last) {
10416                         advance_peer_ack_point = last->rec.data.tsn;
10417                 }
10418                 if (asoc->idata_supported) {
10419                         space_needed = sizeof(struct sctp_forward_tsn_chunk) +
10420                             cnt_of_skipped * sizeof(struct sctp_strseq_mid);
10421                 } else {
10422                         space_needed = sizeof(struct sctp_forward_tsn_chunk) +
10423                             cnt_of_skipped * sizeof(struct sctp_strseq);
10424                 }
10425         }
10426         chk->send_size = space_needed;
10427         /* Setup the chunk */
10428         fwdtsn = mtod(chk->data, struct sctp_forward_tsn_chunk *);
10429         fwdtsn->ch.chunk_length = htons(chk->send_size);
10430         fwdtsn->ch.chunk_flags = 0;
10431         if (asoc->idata_supported) {
10432                 fwdtsn->ch.chunk_type = SCTP_IFORWARD_CUM_TSN;
10433         } else {
10434                 fwdtsn->ch.chunk_type = SCTP_FORWARD_CUM_TSN;
10435         }
10436         fwdtsn->new_cumulative_tsn = htonl(advance_peer_ack_point);
10437         SCTP_BUF_LEN(chk->data) = chk->send_size;
10438         fwdtsn++;
10439         /*-
10440          * Move pointer to after the fwdtsn and transfer to the
10441          * strseq pointer.
10442          */
10443         if (asoc->idata_supported) {
10444                 strseq_m = (struct sctp_strseq_mid *)fwdtsn;
10445                 strseq = NULL;
10446         } else {
10447                 strseq = (struct sctp_strseq *)fwdtsn;
10448                 strseq_m = NULL;
10449         }
10450         /*-
10451          * Now populate the strseq list. This is done blindly
10452          * without pulling out duplicate stream info. This is
10453          * inefficent but won't harm the process since the peer will
10454          * look at these in sequence and will thus release anything.
10455          * It could mean we exceed the PMTU and chop off some that
10456          * we could have included.. but this is unlikely (aka 1432/4
10457          * would mean 300+ stream seq's would have to be reported in
10458          * one FWD-TSN. With a bit of work we can later FIX this to
10459          * optimize and pull out duplicates.. but it does add more
10460          * overhead. So for now... not!
10461          */
10462         i = 0;
10463         TAILQ_FOREACH(at, &asoc->sent_queue, sctp_next) {
10464                 if (i >= cnt_of_skipped) {
10465                         break;
10466                 }
10467                 if (!asoc->idata_supported && (at->rec.data.rcv_flags & SCTP_DATA_UNORDERED)) {
10468                         /* We don't report these */
10469                         continue;
10470                 }
10471                 if (at->rec.data.tsn == advance_peer_ack_point) {
10472                         at->rec.data.fwd_tsn_cnt = 0;
10473                 }
10474                 if (asoc->idata_supported) {
10475                         strseq_m->sid = htons(at->rec.data.sid);
10476                         if (at->rec.data.rcv_flags & SCTP_DATA_UNORDERED) {
10477                                 strseq_m->flags = htons(PR_SCTP_UNORDERED_FLAG);
10478                         } else {
10479                                 strseq_m->flags = 0;
10480                         }
10481                         strseq_m->mid = htonl(at->rec.data.mid);
10482                         strseq_m++;
10483                 } else {
10484                         strseq->sid = htons(at->rec.data.sid);
10485                         strseq->ssn = htons((uint16_t) at->rec.data.mid);
10486                         strseq++;
10487                 }
10488                 i++;
10489         }
10490         return;
10491 }
10492
10493 void
10494 sctp_send_sack(struct sctp_tcb *stcb, int so_locked
10495 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
10496     SCTP_UNUSED
10497 #endif
10498 )
10499 {
10500         /*-
10501          * Queue up a SACK or NR-SACK in the control queue.
10502          * We must first check to see if a SACK or NR-SACK is
10503          * somehow on the control queue.
10504          * If so, we will take and and remove the old one.
10505          */
10506         struct sctp_association *asoc;
10507         struct sctp_tmit_chunk *chk, *a_chk;
10508         struct sctp_sack_chunk *sack;
10509         struct sctp_nr_sack_chunk *nr_sack;
10510         struct sctp_gap_ack_block *gap_descriptor;
10511         const struct sack_track *selector;
10512         int mergeable = 0;
10513         int offset;
10514         caddr_t limit;
10515         uint32_t *dup;
10516         int limit_reached = 0;
10517         unsigned int i, siz, j;
10518         unsigned int num_gap_blocks = 0, num_nr_gap_blocks = 0, space;
10519         int num_dups = 0;
10520         int space_req;
10521         uint32_t highest_tsn;
10522         uint8_t flags;
10523         uint8_t type;
10524         uint8_t tsn_map;
10525
10526         if (stcb->asoc.nrsack_supported == 1) {
10527                 type = SCTP_NR_SELECTIVE_ACK;
10528         } else {
10529                 type = SCTP_SELECTIVE_ACK;
10530         }
10531         a_chk = NULL;
10532         asoc = &stcb->asoc;
10533         SCTP_TCB_LOCK_ASSERT(stcb);
10534         if (asoc->last_data_chunk_from == NULL) {
10535                 /* Hmm we never received anything */
10536                 return;
10537         }
10538         sctp_slide_mapping_arrays(stcb);
10539         sctp_set_rwnd(stcb, asoc);
10540         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
10541                 if (chk->rec.chunk_id.id == type) {
10542                         /* Hmm, found a sack already on queue, remove it */
10543                         TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
10544                         asoc->ctrl_queue_cnt--;
10545                         a_chk = chk;
10546                         if (a_chk->data) {
10547                                 sctp_m_freem(a_chk->data);
10548                                 a_chk->data = NULL;
10549                         }
10550                         if (a_chk->whoTo) {
10551                                 sctp_free_remote_addr(a_chk->whoTo);
10552                                 a_chk->whoTo = NULL;
10553                         }
10554                         break;
10555                 }
10556         }
10557         if (a_chk == NULL) {
10558                 sctp_alloc_a_chunk(stcb, a_chk);
10559                 if (a_chk == NULL) {
10560                         /* No memory so we drop the idea, and set a timer */
10561                         if (stcb->asoc.delayed_ack) {
10562                                 sctp_timer_stop(SCTP_TIMER_TYPE_RECV,
10563                                     stcb->sctp_ep, stcb, NULL,
10564                                     SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_3);
10565                                 sctp_timer_start(SCTP_TIMER_TYPE_RECV,
10566                                     stcb->sctp_ep, stcb, NULL);
10567                         } else {
10568                                 stcb->asoc.send_sack = 1;
10569                         }
10570                         return;
10571                 }
10572                 a_chk->copy_by_ref = 0;
10573                 a_chk->rec.chunk_id.id = type;
10574                 a_chk->rec.chunk_id.can_take_data = 1;
10575         }
10576         /* Clear our pkt counts */
10577         asoc->data_pkts_seen = 0;
10578
10579         a_chk->flags = 0;
10580         a_chk->asoc = asoc;
10581         a_chk->snd_count = 0;
10582         a_chk->send_size = 0;   /* fill in later */
10583         a_chk->sent = SCTP_DATAGRAM_UNSENT;
10584         a_chk->whoTo = NULL;
10585
10586         if (!(asoc->last_data_chunk_from->dest_state & SCTP_ADDR_REACHABLE)) {
10587                 /*-
10588                  * Ok, the destination for the SACK is unreachable, lets see if
10589                  * we can select an alternate to asoc->last_data_chunk_from
10590                  */
10591                 a_chk->whoTo = sctp_find_alternate_net(stcb, asoc->last_data_chunk_from, 0);
10592                 if (a_chk->whoTo == NULL) {
10593                         /* Nope, no alternate */
10594                         a_chk->whoTo = asoc->last_data_chunk_from;
10595                 }
10596         } else {
10597                 a_chk->whoTo = asoc->last_data_chunk_from;
10598         }
10599         if (a_chk->whoTo) {
10600                 atomic_add_int(&a_chk->whoTo->ref_count, 1);
10601         }
10602         if (SCTP_TSN_GT(asoc->highest_tsn_inside_map, asoc->highest_tsn_inside_nr_map)) {
10603                 highest_tsn = asoc->highest_tsn_inside_map;
10604         } else {
10605                 highest_tsn = asoc->highest_tsn_inside_nr_map;
10606         }
10607         if (highest_tsn == asoc->cumulative_tsn) {
10608                 /* no gaps */
10609                 if (type == SCTP_SELECTIVE_ACK) {
10610                         space_req = sizeof(struct sctp_sack_chunk);
10611                 } else {
10612                         space_req = sizeof(struct sctp_nr_sack_chunk);
10613                 }
10614         } else {
10615                 /* gaps get a cluster */
10616                 space_req = MCLBYTES;
10617         }
10618         /* Ok now lets formulate a MBUF with our sack */
10619         a_chk->data = sctp_get_mbuf_for_msg(space_req, 0, M_NOWAIT, 1, MT_DATA);
10620         if ((a_chk->data == NULL) ||
10621             (a_chk->whoTo == NULL)) {
10622                 /* rats, no mbuf memory */
10623                 if (a_chk->data) {
10624                         /* was a problem with the destination */
10625                         sctp_m_freem(a_chk->data);
10626                         a_chk->data = NULL;
10627                 }
10628                 sctp_free_a_chunk(stcb, a_chk, so_locked);
10629                 /* sa_ignore NO_NULL_CHK */
10630                 if (stcb->asoc.delayed_ack) {
10631                         sctp_timer_stop(SCTP_TIMER_TYPE_RECV,
10632                             stcb->sctp_ep, stcb, NULL,
10633                             SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_4);
10634                         sctp_timer_start(SCTP_TIMER_TYPE_RECV,
10635                             stcb->sctp_ep, stcb, NULL);
10636                 } else {
10637                         stcb->asoc.send_sack = 1;
10638                 }
10639                 return;
10640         }
10641         /* ok, lets go through and fill it in */
10642         SCTP_BUF_RESV_UF(a_chk->data, SCTP_MIN_OVERHEAD);
10643         space = (unsigned int)M_TRAILINGSPACE(a_chk->data);
10644         if (space > (a_chk->whoTo->mtu - SCTP_MIN_OVERHEAD)) {
10645                 space = (a_chk->whoTo->mtu - SCTP_MIN_OVERHEAD);
10646         }
10647         limit = mtod(a_chk->data, caddr_t);
10648         limit += space;
10649
10650         flags = 0;
10651
10652         if ((asoc->sctp_cmt_on_off > 0) &&
10653             SCTP_BASE_SYSCTL(sctp_cmt_use_dac)) {
10654                 /*-
10655                  * CMT DAC algorithm: If 2 (i.e., 0x10) packets have been
10656                  * received, then set high bit to 1, else 0. Reset
10657                  * pkts_rcvd.
10658                  */
10659                 flags |= (asoc->cmt_dac_pkts_rcvd << 6);
10660                 asoc->cmt_dac_pkts_rcvd = 0;
10661         }
10662 #ifdef SCTP_ASOCLOG_OF_TSNS
10663         stcb->asoc.cumack_logsnt[stcb->asoc.cumack_log_atsnt] = asoc->cumulative_tsn;
10664         stcb->asoc.cumack_log_atsnt++;
10665         if (stcb->asoc.cumack_log_atsnt >= SCTP_TSN_LOG_SIZE) {
10666                 stcb->asoc.cumack_log_atsnt = 0;
10667         }
10668 #endif
10669         /* reset the readers interpretation */
10670         stcb->freed_by_sorcv_sincelast = 0;
10671
10672         if (type == SCTP_SELECTIVE_ACK) {
10673                 sack = mtod(a_chk->data, struct sctp_sack_chunk *);
10674                 nr_sack = NULL;
10675                 gap_descriptor = (struct sctp_gap_ack_block *)((caddr_t)sack + sizeof(struct sctp_sack_chunk));
10676                 if (highest_tsn > asoc->mapping_array_base_tsn) {
10677                         siz = (((highest_tsn - asoc->mapping_array_base_tsn) + 1) + 7) / 8;
10678                 } else {
10679                         siz = (((MAX_TSN - highest_tsn) + 1) + highest_tsn + 7) / 8;
10680                 }
10681         } else {
10682                 sack = NULL;
10683                 nr_sack = mtod(a_chk->data, struct sctp_nr_sack_chunk *);
10684                 gap_descriptor = (struct sctp_gap_ack_block *)((caddr_t)nr_sack + sizeof(struct sctp_nr_sack_chunk));
10685                 if (asoc->highest_tsn_inside_map > asoc->mapping_array_base_tsn) {
10686                         siz = (((asoc->highest_tsn_inside_map - asoc->mapping_array_base_tsn) + 1) + 7) / 8;
10687                 } else {
10688                         siz = (((MAX_TSN - asoc->mapping_array_base_tsn) + 1) + asoc->highest_tsn_inside_map + 7) / 8;
10689                 }
10690         }
10691
10692         if (SCTP_TSN_GT(asoc->mapping_array_base_tsn, asoc->cumulative_tsn)) {
10693                 offset = 1;
10694         } else {
10695                 offset = asoc->mapping_array_base_tsn - asoc->cumulative_tsn;
10696         }
10697         if (((type == SCTP_SELECTIVE_ACK) &&
10698             SCTP_TSN_GT(highest_tsn, asoc->cumulative_tsn)) ||
10699             ((type == SCTP_NR_SELECTIVE_ACK) &&
10700             SCTP_TSN_GT(asoc->highest_tsn_inside_map, asoc->cumulative_tsn))) {
10701                 /* we have a gap .. maybe */
10702                 for (i = 0; i < siz; i++) {
10703                         tsn_map = asoc->mapping_array[i];
10704                         if (type == SCTP_SELECTIVE_ACK) {
10705                                 tsn_map |= asoc->nr_mapping_array[i];
10706                         }
10707                         if (i == 0) {
10708                                 /*
10709                                  * Clear all bits corresponding to TSNs
10710                                  * smaller or equal to the cumulative TSN.
10711                                  */
10712                                 tsn_map &= (~0U << (1 - offset));
10713                         }
10714                         selector = &sack_array[tsn_map];
10715                         if (mergeable && selector->right_edge) {
10716                                 /*
10717                                  * Backup, left and right edges were ok to
10718                                  * merge.
10719                                  */
10720                                 num_gap_blocks--;
10721                                 gap_descriptor--;
10722                         }
10723                         if (selector->num_entries == 0)
10724                                 mergeable = 0;
10725                         else {
10726                                 for (j = 0; j < selector->num_entries; j++) {
10727                                         if (mergeable && selector->right_edge) {
10728                                                 /*
10729                                                  * do a merge by NOT setting
10730                                                  * the left side
10731                                                  */
10732                                                 mergeable = 0;
10733                                         } else {
10734                                                 /*
10735                                                  * no merge, set the left
10736                                                  * side
10737                                                  */
10738                                                 mergeable = 0;
10739                                                 gap_descriptor->start = htons((selector->gaps[j].start + offset));
10740                                         }
10741                                         gap_descriptor->end = htons((selector->gaps[j].end + offset));
10742                                         num_gap_blocks++;
10743                                         gap_descriptor++;
10744                                         if (((caddr_t)gap_descriptor + sizeof(struct sctp_gap_ack_block)) > limit) {
10745                                                 /* no more room */
10746                                                 limit_reached = 1;
10747                                                 break;
10748                                         }
10749                                 }
10750                                 if (selector->left_edge) {
10751                                         mergeable = 1;
10752                                 }
10753                         }
10754                         if (limit_reached) {
10755                                 /* Reached the limit stop */
10756                                 break;
10757                         }
10758                         offset += 8;
10759                 }
10760         }
10761         if ((type == SCTP_NR_SELECTIVE_ACK) &&
10762             (limit_reached == 0)) {
10763
10764                 mergeable = 0;
10765
10766                 if (asoc->highest_tsn_inside_nr_map > asoc->mapping_array_base_tsn) {
10767                         siz = (((asoc->highest_tsn_inside_nr_map - asoc->mapping_array_base_tsn) + 1) + 7) / 8;
10768                 } else {
10769                         siz = (((MAX_TSN - asoc->mapping_array_base_tsn) + 1) + asoc->highest_tsn_inside_nr_map + 7) / 8;
10770                 }
10771
10772                 if (SCTP_TSN_GT(asoc->mapping_array_base_tsn, asoc->cumulative_tsn)) {
10773                         offset = 1;
10774                 } else {
10775                         offset = asoc->mapping_array_base_tsn - asoc->cumulative_tsn;
10776                 }
10777                 if (SCTP_TSN_GT(asoc->highest_tsn_inside_nr_map, asoc->cumulative_tsn)) {
10778                         /* we have a gap .. maybe */
10779                         for (i = 0; i < siz; i++) {
10780                                 tsn_map = asoc->nr_mapping_array[i];
10781                                 if (i == 0) {
10782                                         /*
10783                                          * Clear all bits corresponding to
10784                                          * TSNs smaller or equal to the
10785                                          * cumulative TSN.
10786                                          */
10787                                         tsn_map &= (~0U << (1 - offset));
10788                                 }
10789                                 selector = &sack_array[tsn_map];
10790                                 if (mergeable && selector->right_edge) {
10791                                         /*
10792                                          * Backup, left and right edges were
10793                                          * ok to merge.
10794                                          */
10795                                         num_nr_gap_blocks--;
10796                                         gap_descriptor--;
10797                                 }
10798                                 if (selector->num_entries == 0)
10799                                         mergeable = 0;
10800                                 else {
10801                                         for (j = 0; j < selector->num_entries; j++) {
10802                                                 if (mergeable && selector->right_edge) {
10803                                                         /*
10804                                                          * do a merge by NOT
10805                                                          * setting the left
10806                                                          * side
10807                                                          */
10808                                                         mergeable = 0;
10809                                                 } else {
10810                                                         /*
10811                                                          * no merge, set the
10812                                                          * left side
10813                                                          */
10814                                                         mergeable = 0;
10815                                                         gap_descriptor->start = htons((selector->gaps[j].start + offset));
10816                                                 }
10817                                                 gap_descriptor->end = htons((selector->gaps[j].end + offset));
10818                                                 num_nr_gap_blocks++;
10819                                                 gap_descriptor++;
10820                                                 if (((caddr_t)gap_descriptor + sizeof(struct sctp_gap_ack_block)) > limit) {
10821                                                         /* no more room */
10822                                                         limit_reached = 1;
10823                                                         break;
10824                                                 }
10825                                         }
10826                                         if (selector->left_edge) {
10827                                                 mergeable = 1;
10828                                         }
10829                                 }
10830                                 if (limit_reached) {
10831                                         /* Reached the limit stop */
10832                                         break;
10833                                 }
10834                                 offset += 8;
10835                         }
10836                 }
10837         }
10838         /* now we must add any dups we are going to report. */
10839         if ((limit_reached == 0) && (asoc->numduptsns)) {
10840                 dup = (uint32_t *) gap_descriptor;
10841                 for (i = 0; i < asoc->numduptsns; i++) {
10842                         *dup = htonl(asoc->dup_tsns[i]);
10843                         dup++;
10844                         num_dups++;
10845                         if (((caddr_t)dup + sizeof(uint32_t)) > limit) {
10846                                 /* no more room */
10847                                 break;
10848                         }
10849                 }
10850                 asoc->numduptsns = 0;
10851         }
10852         /*
10853          * now that the chunk is prepared queue it to the control chunk
10854          * queue.
10855          */
10856         if (type == SCTP_SELECTIVE_ACK) {
10857                 a_chk->send_size = (uint16_t) (sizeof(struct sctp_sack_chunk) +
10858                     (num_gap_blocks + num_nr_gap_blocks) * sizeof(struct sctp_gap_ack_block) +
10859                     num_dups * sizeof(int32_t));
10860                 SCTP_BUF_LEN(a_chk->data) = a_chk->send_size;
10861                 sack->sack.cum_tsn_ack = htonl(asoc->cumulative_tsn);
10862                 sack->sack.a_rwnd = htonl(asoc->my_rwnd);
10863                 sack->sack.num_gap_ack_blks = htons(num_gap_blocks);
10864                 sack->sack.num_dup_tsns = htons(num_dups);
10865                 sack->ch.chunk_type = type;
10866                 sack->ch.chunk_flags = flags;
10867                 sack->ch.chunk_length = htons(a_chk->send_size);
10868         } else {
10869                 a_chk->send_size = (uint16_t) (sizeof(struct sctp_nr_sack_chunk) +
10870                     (num_gap_blocks + num_nr_gap_blocks) * sizeof(struct sctp_gap_ack_block) +
10871                     num_dups * sizeof(int32_t));
10872                 SCTP_BUF_LEN(a_chk->data) = a_chk->send_size;
10873                 nr_sack->nr_sack.cum_tsn_ack = htonl(asoc->cumulative_tsn);
10874                 nr_sack->nr_sack.a_rwnd = htonl(asoc->my_rwnd);
10875                 nr_sack->nr_sack.num_gap_ack_blks = htons(num_gap_blocks);
10876                 nr_sack->nr_sack.num_nr_gap_ack_blks = htons(num_nr_gap_blocks);
10877                 nr_sack->nr_sack.num_dup_tsns = htons(num_dups);
10878                 nr_sack->nr_sack.reserved = 0;
10879                 nr_sack->ch.chunk_type = type;
10880                 nr_sack->ch.chunk_flags = flags;
10881                 nr_sack->ch.chunk_length = htons(a_chk->send_size);
10882         }
10883         TAILQ_INSERT_TAIL(&asoc->control_send_queue, a_chk, sctp_next);
10884         asoc->my_last_reported_rwnd = asoc->my_rwnd;
10885         asoc->ctrl_queue_cnt++;
10886         asoc->send_sack = 0;
10887         SCTP_STAT_INCR(sctps_sendsacks);
10888         return;
10889 }
10890
10891 void
10892 sctp_send_abort_tcb(struct sctp_tcb *stcb, struct mbuf *operr, int so_locked
10893 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
10894     SCTP_UNUSED
10895 #endif
10896 )
10897 {
10898         struct mbuf *m_abort, *m, *m_last;
10899         struct mbuf *m_out, *m_end = NULL;
10900         struct sctp_abort_chunk *abort;
10901         struct sctp_auth_chunk *auth = NULL;
10902         struct sctp_nets *net;
10903         uint32_t vtag;
10904         uint32_t auth_offset = 0;
10905         int error;
10906         uint16_t cause_len, chunk_len, padding_len;
10907
10908         SCTP_TCB_LOCK_ASSERT(stcb);
10909         /*-
10910          * Add an AUTH chunk, if chunk requires it and save the offset into
10911          * the chain for AUTH
10912          */
10913         if (sctp_auth_is_required_chunk(SCTP_ABORT_ASSOCIATION,
10914             stcb->asoc.peer_auth_chunks)) {
10915                 m_out = sctp_add_auth_chunk(NULL, &m_end, &auth, &auth_offset,
10916                     stcb, SCTP_ABORT_ASSOCIATION);
10917                 SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
10918         } else {
10919                 m_out = NULL;
10920         }
10921         m_abort = sctp_get_mbuf_for_msg(sizeof(struct sctp_abort_chunk), 0, M_NOWAIT, 1, MT_HEADER);
10922         if (m_abort == NULL) {
10923                 if (m_out) {
10924                         sctp_m_freem(m_out);
10925                 }
10926                 if (operr) {
10927                         sctp_m_freem(operr);
10928                 }
10929                 return;
10930         }
10931         /* link in any error */
10932         SCTP_BUF_NEXT(m_abort) = operr;
10933         cause_len = 0;
10934         m_last = NULL;
10935         for (m = operr; m; m = SCTP_BUF_NEXT(m)) {
10936                 cause_len += (uint16_t) SCTP_BUF_LEN(m);
10937                 if (SCTP_BUF_NEXT(m) == NULL) {
10938                         m_last = m;
10939                 }
10940         }
10941         SCTP_BUF_LEN(m_abort) = sizeof(struct sctp_abort_chunk);
10942         chunk_len = (uint16_t) sizeof(struct sctp_abort_chunk) + cause_len;
10943         padding_len = SCTP_SIZE32(chunk_len) - chunk_len;
10944         if (m_out == NULL) {
10945                 /* NO Auth chunk prepended, so reserve space in front */
10946                 SCTP_BUF_RESV_UF(m_abort, SCTP_MIN_OVERHEAD);
10947                 m_out = m_abort;
10948         } else {
10949                 /* Put AUTH chunk at the front of the chain */
10950                 SCTP_BUF_NEXT(m_end) = m_abort;
10951         }
10952         if (stcb->asoc.alternate) {
10953                 net = stcb->asoc.alternate;
10954         } else {
10955                 net = stcb->asoc.primary_destination;
10956         }
10957         /* Fill in the ABORT chunk header. */
10958         abort = mtod(m_abort, struct sctp_abort_chunk *);
10959         abort->ch.chunk_type = SCTP_ABORT_ASSOCIATION;
10960         if (stcb->asoc.peer_vtag == 0) {
10961                 /* This happens iff the assoc is in COOKIE-WAIT state. */
10962                 vtag = stcb->asoc.my_vtag;
10963                 abort->ch.chunk_flags = SCTP_HAD_NO_TCB;
10964         } else {
10965                 vtag = stcb->asoc.peer_vtag;
10966                 abort->ch.chunk_flags = 0;
10967         }
10968         abort->ch.chunk_length = htons(chunk_len);
10969         /* Add padding, if necessary. */
10970         if (padding_len > 0) {
10971                 if ((m_last == NULL) ||
10972                     (sctp_add_pad_tombuf(m_last, padding_len) == NULL)) {
10973                         sctp_m_freem(m_out);
10974                         return;
10975                 }
10976         }
10977         if ((error = sctp_lowlevel_chunk_output(stcb->sctp_ep, stcb, net,
10978             (struct sockaddr *)&net->ro._l_addr,
10979             m_out, auth_offset, auth, stcb->asoc.authinfo.active_keyid, 1, 0, 0,
10980             stcb->sctp_ep->sctp_lport, stcb->rport, htonl(vtag),
10981             stcb->asoc.primary_destination->port, NULL,
10982             0, 0,
10983             so_locked))) {
10984                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
10985                 if (error == ENOBUFS) {
10986                         stcb->asoc.ifp_had_enobuf = 1;
10987                         SCTP_STAT_INCR(sctps_lowlevelerr);
10988                 }
10989         } else {
10990                 stcb->asoc.ifp_had_enobuf = 0;
10991         }
10992         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
10993 }
10994
10995 void
10996 sctp_send_shutdown_complete(struct sctp_tcb *stcb,
10997     struct sctp_nets *net,
10998     int reflect_vtag)
10999 {
11000         /* formulate and SEND a SHUTDOWN-COMPLETE */
11001         struct mbuf *m_shutdown_comp;
11002         struct sctp_shutdown_complete_chunk *shutdown_complete;
11003         uint32_t vtag;
11004         int error;
11005         uint8_t flags;
11006
11007         m_shutdown_comp = sctp_get_mbuf_for_msg(sizeof(struct sctp_chunkhdr), 0, M_NOWAIT, 1, MT_HEADER);
11008         if (m_shutdown_comp == NULL) {
11009                 /* no mbuf's */
11010                 return;
11011         }
11012         if (reflect_vtag) {
11013                 flags = SCTP_HAD_NO_TCB;
11014                 vtag = stcb->asoc.my_vtag;
11015         } else {
11016                 flags = 0;
11017                 vtag = stcb->asoc.peer_vtag;
11018         }
11019         shutdown_complete = mtod(m_shutdown_comp, struct sctp_shutdown_complete_chunk *);
11020         shutdown_complete->ch.chunk_type = SCTP_SHUTDOWN_COMPLETE;
11021         shutdown_complete->ch.chunk_flags = flags;
11022         shutdown_complete->ch.chunk_length = htons(sizeof(struct sctp_shutdown_complete_chunk));
11023         SCTP_BUF_LEN(m_shutdown_comp) = sizeof(struct sctp_shutdown_complete_chunk);
11024         if ((error = sctp_lowlevel_chunk_output(stcb->sctp_ep, stcb, net,
11025             (struct sockaddr *)&net->ro._l_addr,
11026             m_shutdown_comp, 0, NULL, 0, 1, 0, 0,
11027             stcb->sctp_ep->sctp_lport, stcb->rport,
11028             htonl(vtag),
11029             net->port, NULL,
11030             0, 0,
11031             SCTP_SO_NOT_LOCKED))) {
11032                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
11033                 if (error == ENOBUFS) {
11034                         stcb->asoc.ifp_had_enobuf = 1;
11035                         SCTP_STAT_INCR(sctps_lowlevelerr);
11036                 }
11037         } else {
11038                 stcb->asoc.ifp_had_enobuf = 0;
11039         }
11040         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
11041         return;
11042 }
11043
11044 static void
11045 sctp_send_resp_msg(struct sockaddr *src, struct sockaddr *dst,
11046     struct sctphdr *sh, uint32_t vtag,
11047     uint8_t type, struct mbuf *cause,
11048     uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum,
11049     uint32_t vrf_id, uint16_t port)
11050 {
11051         struct mbuf *o_pak;
11052         struct mbuf *mout;
11053         struct sctphdr *shout;
11054         struct sctp_chunkhdr *ch;
11055 #if defined(INET) || defined(INET6)
11056         struct udphdr *udp;
11057 #endif
11058         int ret, len, cause_len, padding_len;
11059 #ifdef INET
11060         struct sockaddr_in *src_sin, *dst_sin;
11061         struct ip *ip;
11062 #endif
11063 #ifdef INET6
11064         struct sockaddr_in6 *src_sin6, *dst_sin6;
11065         struct ip6_hdr *ip6;
11066 #endif
11067
11068         /* Compute the length of the cause and add final padding. */
11069         cause_len = 0;
11070         if (cause != NULL) {
11071                 struct mbuf *m_at, *m_last = NULL;
11072
11073                 for (m_at = cause; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
11074                         if (SCTP_BUF_NEXT(m_at) == NULL)
11075                                 m_last = m_at;
11076                         cause_len += SCTP_BUF_LEN(m_at);
11077                 }
11078                 padding_len = cause_len % 4;
11079                 if (padding_len != 0) {
11080                         padding_len = 4 - padding_len;
11081                 }
11082                 if (padding_len != 0) {
11083                         if (sctp_add_pad_tombuf(m_last, padding_len) == NULL) {
11084                                 sctp_m_freem(cause);
11085                                 return;
11086                         }
11087                 }
11088         } else {
11089                 padding_len = 0;
11090         }
11091         /* Get an mbuf for the header. */
11092         len = sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
11093         switch (dst->sa_family) {
11094 #ifdef INET
11095         case AF_INET:
11096                 len += sizeof(struct ip);
11097                 break;
11098 #endif
11099 #ifdef INET6
11100         case AF_INET6:
11101                 len += sizeof(struct ip6_hdr);
11102                 break;
11103 #endif
11104         default:
11105                 break;
11106         }
11107 #if defined(INET) || defined(INET6)
11108         if (port) {
11109                 len += sizeof(struct udphdr);
11110         }
11111 #endif
11112         mout = sctp_get_mbuf_for_msg(len + max_linkhdr, 1, M_NOWAIT, 1, MT_DATA);
11113         if (mout == NULL) {
11114                 if (cause) {
11115                         sctp_m_freem(cause);
11116                 }
11117                 return;
11118         }
11119         SCTP_BUF_RESV_UF(mout, max_linkhdr);
11120         SCTP_BUF_LEN(mout) = len;
11121         SCTP_BUF_NEXT(mout) = cause;
11122         M_SETFIB(mout, fibnum);
11123         mout->m_pkthdr.flowid = mflowid;
11124         M_HASHTYPE_SET(mout, mflowtype);
11125 #ifdef INET
11126         ip = NULL;
11127 #endif
11128 #ifdef INET6
11129         ip6 = NULL;
11130 #endif
11131         switch (dst->sa_family) {
11132 #ifdef INET
11133         case AF_INET:
11134                 src_sin = (struct sockaddr_in *)src;
11135                 dst_sin = (struct sockaddr_in *)dst;
11136                 ip = mtod(mout, struct ip *);
11137                 ip->ip_v = IPVERSION;
11138                 ip->ip_hl = (sizeof(struct ip) >> 2);
11139                 ip->ip_tos = 0;
11140                 ip->ip_off = htons(IP_DF);
11141                 ip_fillid(ip);
11142                 ip->ip_ttl = MODULE_GLOBAL(ip_defttl);
11143                 if (port) {
11144                         ip->ip_p = IPPROTO_UDP;
11145                 } else {
11146                         ip->ip_p = IPPROTO_SCTP;
11147                 }
11148                 ip->ip_src.s_addr = dst_sin->sin_addr.s_addr;
11149                 ip->ip_dst.s_addr = src_sin->sin_addr.s_addr;
11150                 ip->ip_sum = 0;
11151                 len = sizeof(struct ip);
11152                 shout = (struct sctphdr *)((caddr_t)ip + len);
11153                 break;
11154 #endif
11155 #ifdef INET6
11156         case AF_INET6:
11157                 src_sin6 = (struct sockaddr_in6 *)src;
11158                 dst_sin6 = (struct sockaddr_in6 *)dst;
11159                 ip6 = mtod(mout, struct ip6_hdr *);
11160                 ip6->ip6_flow = htonl(0x60000000);
11161                 if (V_ip6_auto_flowlabel) {
11162                         ip6->ip6_flow |= (htonl(ip6_randomflowlabel()) & IPV6_FLOWLABEL_MASK);
11163                 }
11164                 ip6->ip6_hlim = MODULE_GLOBAL(ip6_defhlim);
11165                 if (port) {
11166                         ip6->ip6_nxt = IPPROTO_UDP;
11167                 } else {
11168                         ip6->ip6_nxt = IPPROTO_SCTP;
11169                 }
11170                 ip6->ip6_src = dst_sin6->sin6_addr;
11171                 ip6->ip6_dst = src_sin6->sin6_addr;
11172                 len = sizeof(struct ip6_hdr);
11173                 shout = (struct sctphdr *)((caddr_t)ip6 + len);
11174                 break;
11175 #endif
11176         default:
11177                 len = 0;
11178                 shout = mtod(mout, struct sctphdr *);
11179                 break;
11180         }
11181 #if defined(INET) || defined(INET6)
11182         if (port) {
11183                 if (htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port)) == 0) {
11184                         sctp_m_freem(mout);
11185                         return;
11186                 }
11187                 udp = (struct udphdr *)shout;
11188                 udp->uh_sport = htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port));
11189                 udp->uh_dport = port;
11190                 udp->uh_sum = 0;
11191                 udp->uh_ulen = htons((uint16_t) (sizeof(struct udphdr) +
11192                     sizeof(struct sctphdr) +
11193                     sizeof(struct sctp_chunkhdr) +
11194                     cause_len + padding_len));
11195                 len += sizeof(struct udphdr);
11196                 shout = (struct sctphdr *)((caddr_t)shout + sizeof(struct udphdr));
11197         } else {
11198                 udp = NULL;
11199         }
11200 #endif
11201         shout->src_port = sh->dest_port;
11202         shout->dest_port = sh->src_port;
11203         shout->checksum = 0;
11204         if (vtag) {
11205                 shout->v_tag = htonl(vtag);
11206         } else {
11207                 shout->v_tag = sh->v_tag;
11208         }
11209         len += sizeof(struct sctphdr);
11210         ch = (struct sctp_chunkhdr *)((caddr_t)shout + sizeof(struct sctphdr));
11211         ch->chunk_type = type;
11212         if (vtag) {
11213                 ch->chunk_flags = 0;
11214         } else {
11215                 ch->chunk_flags = SCTP_HAD_NO_TCB;
11216         }
11217         ch->chunk_length = htons((uint16_t) (sizeof(struct sctp_chunkhdr) + cause_len));
11218         len += sizeof(struct sctp_chunkhdr);
11219         len += cause_len + padding_len;
11220
11221         if (SCTP_GET_HEADER_FOR_OUTPUT(o_pak)) {
11222                 sctp_m_freem(mout);
11223                 return;
11224         }
11225         SCTP_ATTACH_CHAIN(o_pak, mout, len);
11226         switch (dst->sa_family) {
11227 #ifdef INET
11228         case AF_INET:
11229                 if (port) {
11230                         if (V_udp_cksum) {
11231                                 udp->uh_sum = in_pseudo(ip->ip_src.s_addr, ip->ip_dst.s_addr, udp->uh_ulen + htons(IPPROTO_UDP));
11232                         } else {
11233                                 udp->uh_sum = 0;
11234                         }
11235                 }
11236                 ip->ip_len = htons(len);
11237                 if (port) {
11238                         shout->checksum = sctp_calculate_cksum(mout, sizeof(struct ip) + sizeof(struct udphdr));
11239                         SCTP_STAT_INCR(sctps_sendswcrc);
11240                         if (V_udp_cksum) {
11241                                 SCTP_ENABLE_UDP_CSUM(o_pak);
11242                         }
11243                 } else {
11244                         mout->m_pkthdr.csum_flags = CSUM_SCTP;
11245                         mout->m_pkthdr.csum_data = offsetof(struct sctphdr, checksum);
11246                         SCTP_STAT_INCR(sctps_sendhwcrc);
11247                 }
11248 #ifdef SCTP_PACKET_LOGGING
11249                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING) {
11250                         sctp_packet_log(o_pak);
11251                 }
11252 #endif
11253                 SCTP_IP_OUTPUT(ret, o_pak, NULL, NULL, vrf_id);
11254                 break;
11255 #endif
11256 #ifdef INET6
11257         case AF_INET6:
11258                 ip6->ip6_plen = htons(len - sizeof(struct ip6_hdr));
11259                 if (port) {
11260                         shout->checksum = sctp_calculate_cksum(mout, sizeof(struct ip6_hdr) + sizeof(struct udphdr));
11261                         SCTP_STAT_INCR(sctps_sendswcrc);
11262                         if ((udp->uh_sum = in6_cksum(o_pak, IPPROTO_UDP, sizeof(struct ip6_hdr), len - sizeof(struct ip6_hdr))) == 0) {
11263                                 udp->uh_sum = 0xffff;
11264                         }
11265                 } else {
11266                         mout->m_pkthdr.csum_flags = CSUM_SCTP_IPV6;
11267                         mout->m_pkthdr.csum_data = offsetof(struct sctphdr, checksum);
11268                         SCTP_STAT_INCR(sctps_sendhwcrc);
11269                 }
11270 #ifdef SCTP_PACKET_LOGGING
11271                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING) {
11272                         sctp_packet_log(o_pak);
11273                 }
11274 #endif
11275                 SCTP_IP6_OUTPUT(ret, o_pak, NULL, NULL, NULL, vrf_id);
11276                 break;
11277 #endif
11278         default:
11279                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Unknown protocol (TSNH) type %d\n",
11280                     dst->sa_family);
11281                 sctp_m_freem(mout);
11282                 SCTP_LTRACE_ERR_RET_PKT(mout, NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EFAULT);
11283                 return;
11284         }
11285         SCTPDBG(SCTP_DEBUG_OUTPUT3, "return from send is %d\n", ret);
11286         SCTP_STAT_INCR(sctps_sendpackets);
11287         SCTP_STAT_INCR_COUNTER64(sctps_outpackets);
11288         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
11289         if (ret) {
11290                 SCTP_STAT_INCR(sctps_senderrors);
11291         }
11292         return;
11293 }
11294
11295 void
11296 sctp_send_shutdown_complete2(struct sockaddr *src, struct sockaddr *dst,
11297     struct sctphdr *sh,
11298     uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum,
11299     uint32_t vrf_id, uint16_t port)
11300 {
11301         sctp_send_resp_msg(src, dst, sh, 0, SCTP_SHUTDOWN_COMPLETE, NULL,
11302             mflowtype, mflowid, fibnum,
11303             vrf_id, port);
11304 }
11305
11306 void
11307 sctp_send_hb(struct sctp_tcb *stcb, struct sctp_nets *net, int so_locked
11308 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
11309     SCTP_UNUSED
11310 #endif
11311 )
11312 {
11313         struct sctp_tmit_chunk *chk;
11314         struct sctp_heartbeat_chunk *hb;
11315         struct timeval now;
11316
11317         SCTP_TCB_LOCK_ASSERT(stcb);
11318         if (net == NULL) {
11319                 return;
11320         }
11321         (void)SCTP_GETTIME_TIMEVAL(&now);
11322         switch (net->ro._l_addr.sa.sa_family) {
11323 #ifdef INET
11324         case AF_INET:
11325                 break;
11326 #endif
11327 #ifdef INET6
11328         case AF_INET6:
11329                 break;
11330 #endif
11331         default:
11332                 return;
11333         }
11334         sctp_alloc_a_chunk(stcb, chk);
11335         if (chk == NULL) {
11336                 SCTPDBG(SCTP_DEBUG_OUTPUT4, "Gak, can't get a chunk for hb\n");
11337                 return;
11338         }
11339
11340         chk->copy_by_ref = 0;
11341         chk->rec.chunk_id.id = SCTP_HEARTBEAT_REQUEST;
11342         chk->rec.chunk_id.can_take_data = 1;
11343         chk->flags = 0;
11344         chk->asoc = &stcb->asoc;
11345         chk->send_size = sizeof(struct sctp_heartbeat_chunk);
11346
11347         chk->data = sctp_get_mbuf_for_msg(chk->send_size, 0, M_NOWAIT, 1, MT_HEADER);
11348         if (chk->data == NULL) {
11349                 sctp_free_a_chunk(stcb, chk, so_locked);
11350                 return;
11351         }
11352         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11353         SCTP_BUF_LEN(chk->data) = chk->send_size;
11354         chk->sent = SCTP_DATAGRAM_UNSENT;
11355         chk->snd_count = 0;
11356         chk->whoTo = net;
11357         atomic_add_int(&chk->whoTo->ref_count, 1);
11358         /* Now we have a mbuf that we can fill in with the details */
11359         hb = mtod(chk->data, struct sctp_heartbeat_chunk *);
11360         memset(hb, 0, sizeof(struct sctp_heartbeat_chunk));
11361         /* fill out chunk header */
11362         hb->ch.chunk_type = SCTP_HEARTBEAT_REQUEST;
11363         hb->ch.chunk_flags = 0;
11364         hb->ch.chunk_length = htons(chk->send_size);
11365         /* Fill out hb parameter */
11366         hb->heartbeat.hb_info.ph.param_type = htons(SCTP_HEARTBEAT_INFO);
11367         hb->heartbeat.hb_info.ph.param_length = htons(sizeof(struct sctp_heartbeat_info_param));
11368         hb->heartbeat.hb_info.time_value_1 = now.tv_sec;
11369         hb->heartbeat.hb_info.time_value_2 = now.tv_usec;
11370         /* Did our user request this one, put it in */
11371         hb->heartbeat.hb_info.addr_family = (uint8_t) net->ro._l_addr.sa.sa_family;
11372         hb->heartbeat.hb_info.addr_len = net->ro._l_addr.sa.sa_len;
11373         if (net->dest_state & SCTP_ADDR_UNCONFIRMED) {
11374                 /*
11375                  * we only take from the entropy pool if the address is not
11376                  * confirmed.
11377                  */
11378                 net->heartbeat_random1 = hb->heartbeat.hb_info.random_value1 = sctp_select_initial_TSN(&stcb->sctp_ep->sctp_ep);
11379                 net->heartbeat_random2 = hb->heartbeat.hb_info.random_value2 = sctp_select_initial_TSN(&stcb->sctp_ep->sctp_ep);
11380         } else {
11381                 net->heartbeat_random1 = hb->heartbeat.hb_info.random_value1 = 0;
11382                 net->heartbeat_random2 = hb->heartbeat.hb_info.random_value2 = 0;
11383         }
11384         switch (net->ro._l_addr.sa.sa_family) {
11385 #ifdef INET
11386         case AF_INET:
11387                 memcpy(hb->heartbeat.hb_info.address,
11388                     &net->ro._l_addr.sin.sin_addr,
11389                     sizeof(net->ro._l_addr.sin.sin_addr));
11390                 break;
11391 #endif
11392 #ifdef INET6
11393         case AF_INET6:
11394                 memcpy(hb->heartbeat.hb_info.address,
11395                     &net->ro._l_addr.sin6.sin6_addr,
11396                     sizeof(net->ro._l_addr.sin6.sin6_addr));
11397                 break;
11398 #endif
11399         default:
11400                 if (chk->data) {
11401                         sctp_m_freem(chk->data);
11402                         chk->data = NULL;
11403                 }
11404                 sctp_free_a_chunk(stcb, chk, so_locked);
11405                 return;
11406                 break;
11407         }
11408         net->hb_responded = 0;
11409         TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
11410         stcb->asoc.ctrl_queue_cnt++;
11411         SCTP_STAT_INCR(sctps_sendheartbeat);
11412         return;
11413 }
11414
11415 void
11416 sctp_send_ecn_echo(struct sctp_tcb *stcb, struct sctp_nets *net,
11417     uint32_t high_tsn)
11418 {
11419         struct sctp_association *asoc;
11420         struct sctp_ecne_chunk *ecne;
11421         struct sctp_tmit_chunk *chk;
11422
11423         if (net == NULL) {
11424                 return;
11425         }
11426         asoc = &stcb->asoc;
11427         SCTP_TCB_LOCK_ASSERT(stcb);
11428         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
11429                 if ((chk->rec.chunk_id.id == SCTP_ECN_ECHO) && (net == chk->whoTo)) {
11430                         /* found a previous ECN_ECHO update it if needed */
11431                         uint32_t cnt, ctsn;
11432
11433                         ecne = mtod(chk->data, struct sctp_ecne_chunk *);
11434                         ctsn = ntohl(ecne->tsn);
11435                         if (SCTP_TSN_GT(high_tsn, ctsn)) {
11436                                 ecne->tsn = htonl(high_tsn);
11437                                 SCTP_STAT_INCR(sctps_queue_upd_ecne);
11438                         }
11439                         cnt = ntohl(ecne->num_pkts_since_cwr);
11440                         cnt++;
11441                         ecne->num_pkts_since_cwr = htonl(cnt);
11442                         return;
11443                 }
11444         }
11445         /* nope could not find one to update so we must build one */
11446         sctp_alloc_a_chunk(stcb, chk);
11447         if (chk == NULL) {
11448                 return;
11449         }
11450         SCTP_STAT_INCR(sctps_queue_upd_ecne);
11451         chk->copy_by_ref = 0;
11452         chk->rec.chunk_id.id = SCTP_ECN_ECHO;
11453         chk->rec.chunk_id.can_take_data = 0;
11454         chk->flags = 0;
11455         chk->asoc = &stcb->asoc;
11456         chk->send_size = sizeof(struct sctp_ecne_chunk);
11457         chk->data = sctp_get_mbuf_for_msg(chk->send_size, 0, M_NOWAIT, 1, MT_HEADER);
11458         if (chk->data == NULL) {
11459                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
11460                 return;
11461         }
11462         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11463         SCTP_BUF_LEN(chk->data) = chk->send_size;
11464         chk->sent = SCTP_DATAGRAM_UNSENT;
11465         chk->snd_count = 0;
11466         chk->whoTo = net;
11467         atomic_add_int(&chk->whoTo->ref_count, 1);
11468
11469         stcb->asoc.ecn_echo_cnt_onq++;
11470         ecne = mtod(chk->data, struct sctp_ecne_chunk *);
11471         ecne->ch.chunk_type = SCTP_ECN_ECHO;
11472         ecne->ch.chunk_flags = 0;
11473         ecne->ch.chunk_length = htons(sizeof(struct sctp_ecne_chunk));
11474         ecne->tsn = htonl(high_tsn);
11475         ecne->num_pkts_since_cwr = htonl(1);
11476         TAILQ_INSERT_HEAD(&stcb->asoc.control_send_queue, chk, sctp_next);
11477         asoc->ctrl_queue_cnt++;
11478 }
11479
11480 void
11481 sctp_send_packet_dropped(struct sctp_tcb *stcb, struct sctp_nets *net,
11482     struct mbuf *m, int len, int iphlen, int bad_crc)
11483 {
11484         struct sctp_association *asoc;
11485         struct sctp_pktdrop_chunk *drp;
11486         struct sctp_tmit_chunk *chk;
11487         uint8_t *datap;
11488         int was_trunc = 0;
11489         int fullsz = 0;
11490         long spc;
11491         int offset;
11492         struct sctp_chunkhdr *ch, chunk_buf;
11493         unsigned int chk_length;
11494
11495         if (!stcb) {
11496                 return;
11497         }
11498         asoc = &stcb->asoc;
11499         SCTP_TCB_LOCK_ASSERT(stcb);
11500         if (asoc->pktdrop_supported == 0) {
11501                 /*-
11502                  * peer must declare support before I send one.
11503                  */
11504                 return;
11505         }
11506         if (stcb->sctp_socket == NULL) {
11507                 return;
11508         }
11509         sctp_alloc_a_chunk(stcb, chk);
11510         if (chk == NULL) {
11511                 return;
11512         }
11513         chk->copy_by_ref = 0;
11514         chk->rec.chunk_id.id = SCTP_PACKET_DROPPED;
11515         chk->rec.chunk_id.can_take_data = 1;
11516         chk->flags = 0;
11517         len -= iphlen;
11518         chk->send_size = len;
11519         /* Validate that we do not have an ABORT in here. */
11520         offset = iphlen + sizeof(struct sctphdr);
11521         ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, offset,
11522             sizeof(*ch), (uint8_t *) & chunk_buf);
11523         while (ch != NULL) {
11524                 chk_length = ntohs(ch->chunk_length);
11525                 if (chk_length < sizeof(*ch)) {
11526                         /* break to abort land */
11527                         break;
11528                 }
11529                 switch (ch->chunk_type) {
11530                 case SCTP_PACKET_DROPPED:
11531                 case SCTP_ABORT_ASSOCIATION:
11532                 case SCTP_INITIATION_ACK:
11533                         /**
11534                          * We don't respond with an PKT-DROP to an ABORT
11535                          * or PKT-DROP. We also do not respond to an
11536                          * INIT-ACK, because we can't know if the initiation
11537                          * tag is correct or not.
11538                          */
11539                         sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
11540                         return;
11541                 default:
11542                         break;
11543                 }
11544                 offset += SCTP_SIZE32(chk_length);
11545                 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, offset,
11546                     sizeof(*ch), (uint8_t *) & chunk_buf);
11547         }
11548
11549         if ((len + SCTP_MAX_OVERHEAD + sizeof(struct sctp_pktdrop_chunk)) >
11550             min(stcb->asoc.smallest_mtu, MCLBYTES)) {
11551                 /*
11552                  * only send 1 mtu worth, trim off the excess on the end.
11553                  */
11554                 fullsz = len;
11555                 len = min(stcb->asoc.smallest_mtu, MCLBYTES) - SCTP_MAX_OVERHEAD;
11556                 was_trunc = 1;
11557         }
11558         chk->asoc = &stcb->asoc;
11559         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
11560         if (chk->data == NULL) {
11561 jump_out:
11562                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
11563                 return;
11564         }
11565         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11566         drp = mtod(chk->data, struct sctp_pktdrop_chunk *);
11567         if (drp == NULL) {
11568                 sctp_m_freem(chk->data);
11569                 chk->data = NULL;
11570                 goto jump_out;
11571         }
11572         chk->book_size = SCTP_SIZE32((chk->send_size + sizeof(struct sctp_pktdrop_chunk) +
11573             sizeof(struct sctphdr) + SCTP_MED_OVERHEAD));
11574         chk->book_size_scale = 0;
11575         if (was_trunc) {
11576                 drp->ch.chunk_flags = SCTP_PACKET_TRUNCATED;
11577                 drp->trunc_len = htons(fullsz);
11578                 /*
11579                  * Len is already adjusted to size minus overhead above take
11580                  * out the pkt_drop chunk itself from it.
11581                  */
11582                 chk->send_size = (uint16_t) (len - sizeof(struct sctp_pktdrop_chunk));
11583                 len = chk->send_size;
11584         } else {
11585                 /* no truncation needed */
11586                 drp->ch.chunk_flags = 0;
11587                 drp->trunc_len = htons(0);
11588         }
11589         if (bad_crc) {
11590                 drp->ch.chunk_flags |= SCTP_BADCRC;
11591         }
11592         chk->send_size += sizeof(struct sctp_pktdrop_chunk);
11593         SCTP_BUF_LEN(chk->data) = chk->send_size;
11594         chk->sent = SCTP_DATAGRAM_UNSENT;
11595         chk->snd_count = 0;
11596         if (net) {
11597                 /* we should hit here */
11598                 chk->whoTo = net;
11599                 atomic_add_int(&chk->whoTo->ref_count, 1);
11600         } else {
11601                 chk->whoTo = NULL;
11602         }
11603         drp->ch.chunk_type = SCTP_PACKET_DROPPED;
11604         drp->ch.chunk_length = htons(chk->send_size);
11605         spc = SCTP_SB_LIMIT_RCV(stcb->sctp_socket);
11606         if (spc < 0) {
11607                 spc = 0;
11608         }
11609         drp->bottle_bw = htonl(spc);
11610         if (asoc->my_rwnd) {
11611                 drp->current_onq = htonl(asoc->size_on_reasm_queue +
11612                     asoc->size_on_all_streams +
11613                     asoc->my_rwnd_control_len +
11614                     stcb->sctp_socket->so_rcv.sb_cc);
11615         } else {
11616                 /*-
11617                  * If my rwnd is 0, possibly from mbuf depletion as well as
11618                  * space used, tell the peer there is NO space aka onq == bw
11619                  */
11620                 drp->current_onq = htonl(spc);
11621         }
11622         drp->reserved = 0;
11623         datap = drp->data;
11624         m_copydata(m, iphlen, len, (caddr_t)datap);
11625         TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
11626         asoc->ctrl_queue_cnt++;
11627 }
11628
11629 void
11630 sctp_send_cwr(struct sctp_tcb *stcb, struct sctp_nets *net, uint32_t high_tsn, uint8_t override)
11631 {
11632         struct sctp_association *asoc;
11633         struct sctp_cwr_chunk *cwr;
11634         struct sctp_tmit_chunk *chk;
11635
11636         SCTP_TCB_LOCK_ASSERT(stcb);
11637         if (net == NULL) {
11638                 return;
11639         }
11640         asoc = &stcb->asoc;
11641         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
11642                 if ((chk->rec.chunk_id.id == SCTP_ECN_CWR) && (net == chk->whoTo)) {
11643                         /*
11644                          * found a previous CWR queued to same destination
11645                          * update it if needed
11646                          */
11647                         uint32_t ctsn;
11648
11649                         cwr = mtod(chk->data, struct sctp_cwr_chunk *);
11650                         ctsn = ntohl(cwr->tsn);
11651                         if (SCTP_TSN_GT(high_tsn, ctsn)) {
11652                                 cwr->tsn = htonl(high_tsn);
11653                         }
11654                         if (override & SCTP_CWR_REDUCE_OVERRIDE) {
11655                                 /* Make sure override is carried */
11656                                 cwr->ch.chunk_flags |= SCTP_CWR_REDUCE_OVERRIDE;
11657                         }
11658                         return;
11659                 }
11660         }
11661         sctp_alloc_a_chunk(stcb, chk);
11662         if (chk == NULL) {
11663                 return;
11664         }
11665         chk->copy_by_ref = 0;
11666         chk->rec.chunk_id.id = SCTP_ECN_CWR;
11667         chk->rec.chunk_id.can_take_data = 1;
11668         chk->flags = 0;
11669         chk->asoc = &stcb->asoc;
11670         chk->send_size = sizeof(struct sctp_cwr_chunk);
11671         chk->data = sctp_get_mbuf_for_msg(chk->send_size, 0, M_NOWAIT, 1, MT_HEADER);
11672         if (chk->data == NULL) {
11673                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
11674                 return;
11675         }
11676         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11677         SCTP_BUF_LEN(chk->data) = chk->send_size;
11678         chk->sent = SCTP_DATAGRAM_UNSENT;
11679         chk->snd_count = 0;
11680         chk->whoTo = net;
11681         atomic_add_int(&chk->whoTo->ref_count, 1);
11682         cwr = mtod(chk->data, struct sctp_cwr_chunk *);
11683         cwr->ch.chunk_type = SCTP_ECN_CWR;
11684         cwr->ch.chunk_flags = override;
11685         cwr->ch.chunk_length = htons(sizeof(struct sctp_cwr_chunk));
11686         cwr->tsn = htonl(high_tsn);
11687         TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
11688         asoc->ctrl_queue_cnt++;
11689 }
11690
11691 static int
11692 sctp_add_stream_reset_out(struct sctp_tcb *stcb, struct sctp_tmit_chunk *chk,
11693     uint32_t seq, uint32_t resp_seq, uint32_t last_sent)
11694 {
11695         uint16_t len, old_len, i;
11696         struct sctp_stream_reset_out_request *req_out;
11697         struct sctp_chunkhdr *ch;
11698         int at;
11699         int number_entries = 0;
11700
11701         ch = mtod(chk->data, struct sctp_chunkhdr *);
11702         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11703         /* get to new offset for the param. */
11704         req_out = (struct sctp_stream_reset_out_request *)((caddr_t)ch + len);
11705         /* now how long will this param be? */
11706         for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
11707                 if ((stcb->asoc.strmout[i].state == SCTP_STREAM_RESET_PENDING) &&
11708                     (stcb->asoc.strmout[i].chunks_on_queues == 0) &&
11709                     TAILQ_EMPTY(&stcb->asoc.strmout[i].outqueue)) {
11710                         number_entries++;
11711                 }
11712         }
11713         if (number_entries == 0) {
11714                 return (0);
11715         }
11716         if (number_entries == stcb->asoc.streamoutcnt) {
11717                 number_entries = 0;
11718         }
11719         if (number_entries > SCTP_MAX_STREAMS_AT_ONCE_RESET) {
11720                 number_entries = SCTP_MAX_STREAMS_AT_ONCE_RESET;
11721         }
11722         len = (uint16_t) (sizeof(struct sctp_stream_reset_out_request) + (sizeof(uint16_t) * number_entries));
11723         req_out->ph.param_type = htons(SCTP_STR_RESET_OUT_REQUEST);
11724         req_out->ph.param_length = htons(len);
11725         req_out->request_seq = htonl(seq);
11726         req_out->response_seq = htonl(resp_seq);
11727         req_out->send_reset_at_tsn = htonl(last_sent);
11728         at = 0;
11729         if (number_entries) {
11730                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
11731                         if ((stcb->asoc.strmout[i].state == SCTP_STREAM_RESET_PENDING) &&
11732                             (stcb->asoc.strmout[i].chunks_on_queues == 0) &&
11733                             TAILQ_EMPTY(&stcb->asoc.strmout[i].outqueue)) {
11734                                 req_out->list_of_streams[at] = htons(i);
11735                                 at++;
11736                                 stcb->asoc.strmout[i].state = SCTP_STREAM_RESET_IN_FLIGHT;
11737                                 if (at >= number_entries) {
11738                                         break;
11739                                 }
11740                         }
11741                 }
11742         } else {
11743                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
11744                         stcb->asoc.strmout[i].state = SCTP_STREAM_RESET_IN_FLIGHT;
11745                 }
11746         }
11747         if (SCTP_SIZE32(len) > len) {
11748                 /*-
11749                  * Need to worry about the pad we may end up adding to the
11750                  * end. This is easy since the struct is either aligned to 4
11751                  * bytes or 2 bytes off.
11752                  */
11753                 req_out->list_of_streams[number_entries] = 0;
11754         }
11755         /* now fix the chunk length */
11756         ch->chunk_length = htons(len + old_len);
11757         chk->book_size = len + old_len;
11758         chk->book_size_scale = 0;
11759         chk->send_size = SCTP_SIZE32(chk->book_size);
11760         SCTP_BUF_LEN(chk->data) = chk->send_size;
11761         return (1);
11762 }
11763
11764 static void
11765 sctp_add_stream_reset_in(struct sctp_tmit_chunk *chk,
11766     int number_entries, uint16_t * list,
11767     uint32_t seq)
11768 {
11769         uint16_t len, old_len, i;
11770         struct sctp_stream_reset_in_request *req_in;
11771         struct sctp_chunkhdr *ch;
11772
11773         ch = mtod(chk->data, struct sctp_chunkhdr *);
11774         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11775
11776         /* get to new offset for the param. */
11777         req_in = (struct sctp_stream_reset_in_request *)((caddr_t)ch + len);
11778         /* now how long will this param be? */
11779         len = (uint16_t) (sizeof(struct sctp_stream_reset_in_request) + (sizeof(uint16_t) * number_entries));
11780         req_in->ph.param_type = htons(SCTP_STR_RESET_IN_REQUEST);
11781         req_in->ph.param_length = htons(len);
11782         req_in->request_seq = htonl(seq);
11783         if (number_entries) {
11784                 for (i = 0; i < number_entries; i++) {
11785                         req_in->list_of_streams[i] = htons(list[i]);
11786                 }
11787         }
11788         if (SCTP_SIZE32(len) > len) {
11789                 /*-
11790                  * Need to worry about the pad we may end up adding to the
11791                  * end. This is easy since the struct is either aligned to 4
11792                  * bytes or 2 bytes off.
11793                  */
11794                 req_in->list_of_streams[number_entries] = 0;
11795         }
11796         /* now fix the chunk length */
11797         ch->chunk_length = htons(len + old_len);
11798         chk->book_size = len + old_len;
11799         chk->book_size_scale = 0;
11800         chk->send_size = SCTP_SIZE32(chk->book_size);
11801         SCTP_BUF_LEN(chk->data) = chk->send_size;
11802         return;
11803 }
11804
11805 static void
11806 sctp_add_stream_reset_tsn(struct sctp_tmit_chunk *chk,
11807     uint32_t seq)
11808 {
11809         uint16_t len, old_len;
11810         struct sctp_stream_reset_tsn_request *req_tsn;
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         req_tsn = (struct sctp_stream_reset_tsn_request *)((caddr_t)ch + len);
11818         /* now how long will this param be? */
11819         len = sizeof(struct sctp_stream_reset_tsn_request);
11820         req_tsn->ph.param_type = htons(SCTP_STR_RESET_TSN_REQUEST);
11821         req_tsn->ph.param_length = htons(len);
11822         req_tsn->request_seq = htonl(seq);
11823
11824         /* now fix the chunk length */
11825         ch->chunk_length = htons(len + old_len);
11826         chk->send_size = len + old_len;
11827         chk->book_size = SCTP_SIZE32(chk->send_size);
11828         chk->book_size_scale = 0;
11829         SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size);
11830         return;
11831 }
11832
11833 void
11834 sctp_add_stream_reset_result(struct sctp_tmit_chunk *chk,
11835     uint32_t resp_seq, uint32_t result)
11836 {
11837         uint16_t len, old_len;
11838         struct sctp_stream_reset_response *resp;
11839         struct sctp_chunkhdr *ch;
11840
11841         ch = mtod(chk->data, struct sctp_chunkhdr *);
11842         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11843
11844         /* get to new offset for the param. */
11845         resp = (struct sctp_stream_reset_response *)((caddr_t)ch + len);
11846         /* now how long will this param be? */
11847         len = sizeof(struct sctp_stream_reset_response);
11848         resp->ph.param_type = htons(SCTP_STR_RESET_RESPONSE);
11849         resp->ph.param_length = htons(len);
11850         resp->response_seq = htonl(resp_seq);
11851         resp->result = ntohl(result);
11852
11853         /* now fix the chunk length */
11854         ch->chunk_length = htons(len + old_len);
11855         chk->book_size = len + old_len;
11856         chk->book_size_scale = 0;
11857         chk->send_size = SCTP_SIZE32(chk->book_size);
11858         SCTP_BUF_LEN(chk->data) = chk->send_size;
11859         return;
11860 }
11861
11862 void
11863 sctp_send_deferred_reset_response(struct sctp_tcb *stcb,
11864     struct sctp_stream_reset_list *ent,
11865     int response)
11866 {
11867         struct sctp_association *asoc;
11868         struct sctp_tmit_chunk *chk;
11869         struct sctp_chunkhdr *ch;
11870
11871         asoc = &stcb->asoc;
11872
11873         /*
11874          * Reset our last reset action to the new one IP -> response
11875          * (PERFORMED probably). This assures that if we fail to send, a
11876          * retran from the peer will get the new response.
11877          */
11878         asoc->last_reset_action[0] = response;
11879         if (asoc->stream_reset_outstanding) {
11880                 return;
11881         }
11882         sctp_alloc_a_chunk(stcb, chk);
11883         if (chk == NULL) {
11884                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
11885                 return;
11886         }
11887         chk->copy_by_ref = 0;
11888         chk->rec.chunk_id.id = SCTP_STREAM_RESET;
11889         chk->rec.chunk_id.can_take_data = 0;
11890         chk->flags = 0;
11891         chk->asoc = &stcb->asoc;
11892         chk->book_size = sizeof(struct sctp_chunkhdr);
11893         chk->send_size = SCTP_SIZE32(chk->book_size);
11894         chk->book_size_scale = 0;
11895         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
11896         if (chk->data == NULL) {
11897                 sctp_free_a_chunk(stcb, chk, SCTP_SO_LOCKED);
11898                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
11899                 return;
11900         }
11901         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11902         /* setup chunk parameters */
11903         chk->sent = SCTP_DATAGRAM_UNSENT;
11904         chk->snd_count = 0;
11905         if (stcb->asoc.alternate) {
11906                 chk->whoTo = stcb->asoc.alternate;
11907         } else {
11908                 chk->whoTo = stcb->asoc.primary_destination;
11909         }
11910         ch = mtod(chk->data, struct sctp_chunkhdr *);
11911         ch->chunk_type = SCTP_STREAM_RESET;
11912         ch->chunk_flags = 0;
11913         ch->chunk_length = htons(chk->book_size);
11914         atomic_add_int(&chk->whoTo->ref_count, 1);
11915         SCTP_BUF_LEN(chk->data) = chk->send_size;
11916         sctp_add_stream_reset_result(chk, ent->seq, response);
11917         /* insert the chunk for sending */
11918         TAILQ_INSERT_TAIL(&asoc->control_send_queue,
11919             chk,
11920             sctp_next);
11921         asoc->ctrl_queue_cnt++;
11922 }
11923
11924 void
11925 sctp_add_stream_reset_result_tsn(struct sctp_tmit_chunk *chk,
11926     uint32_t resp_seq, uint32_t result,
11927     uint32_t send_una, uint32_t recv_next)
11928 {
11929         uint16_t len, old_len;
11930         struct sctp_stream_reset_response_tsn *resp;
11931         struct sctp_chunkhdr *ch;
11932
11933         ch = mtod(chk->data, struct sctp_chunkhdr *);
11934         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11935
11936         /* get to new offset for the param. */
11937         resp = (struct sctp_stream_reset_response_tsn *)((caddr_t)ch + len);
11938         /* now how long will this param be? */
11939         len = sizeof(struct sctp_stream_reset_response_tsn);
11940         resp->ph.param_type = htons(SCTP_STR_RESET_RESPONSE);
11941         resp->ph.param_length = htons(len);
11942         resp->response_seq = htonl(resp_seq);
11943         resp->result = htonl(result);
11944         resp->senders_next_tsn = htonl(send_una);
11945         resp->receivers_next_tsn = htonl(recv_next);
11946
11947         /* now fix the chunk length */
11948         ch->chunk_length = htons(len + old_len);
11949         chk->book_size = len + old_len;
11950         chk->send_size = SCTP_SIZE32(chk->book_size);
11951         chk->book_size_scale = 0;
11952         SCTP_BUF_LEN(chk->data) = chk->send_size;
11953         return;
11954 }
11955
11956 static void
11957 sctp_add_an_out_stream(struct sctp_tmit_chunk *chk,
11958     uint32_t seq,
11959     uint16_t adding)
11960 {
11961         uint16_t len, old_len;
11962         struct sctp_chunkhdr *ch;
11963         struct sctp_stream_reset_add_strm *addstr;
11964
11965         ch = mtod(chk->data, struct sctp_chunkhdr *);
11966         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11967
11968         /* get to new offset for the param. */
11969         addstr = (struct sctp_stream_reset_add_strm *)((caddr_t)ch + len);
11970         /* now how long will this param be? */
11971         len = sizeof(struct sctp_stream_reset_add_strm);
11972
11973         /* Fill it out. */
11974         addstr->ph.param_type = htons(SCTP_STR_RESET_ADD_OUT_STREAMS);
11975         addstr->ph.param_length = htons(len);
11976         addstr->request_seq = htonl(seq);
11977         addstr->number_of_streams = htons(adding);
11978         addstr->reserved = 0;
11979
11980         /* now fix the chunk length */
11981         ch->chunk_length = htons(len + old_len);
11982         chk->send_size = len + old_len;
11983         chk->book_size = SCTP_SIZE32(chk->send_size);
11984         chk->book_size_scale = 0;
11985         SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size);
11986         return;
11987 }
11988
11989 static void
11990 sctp_add_an_in_stream(struct sctp_tmit_chunk *chk,
11991     uint32_t seq,
11992     uint16_t adding)
11993 {
11994         uint16_t len, old_len;
11995         struct sctp_chunkhdr *ch;
11996         struct sctp_stream_reset_add_strm *addstr;
11997
11998         ch = mtod(chk->data, struct sctp_chunkhdr *);
11999         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
12000
12001         /* get to new offset for the param. */
12002         addstr = (struct sctp_stream_reset_add_strm *)((caddr_t)ch + len);
12003         /* now how long will this param be? */
12004         len = sizeof(struct sctp_stream_reset_add_strm);
12005         /* Fill it out. */
12006         addstr->ph.param_type = htons(SCTP_STR_RESET_ADD_IN_STREAMS);
12007         addstr->ph.param_length = htons(len);
12008         addstr->request_seq = htonl(seq);
12009         addstr->number_of_streams = htons(adding);
12010         addstr->reserved = 0;
12011
12012         /* now fix the chunk length */
12013         ch->chunk_length = htons(len + old_len);
12014         chk->send_size = len + old_len;
12015         chk->book_size = SCTP_SIZE32(chk->send_size);
12016         chk->book_size_scale = 0;
12017         SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size);
12018         return;
12019 }
12020
12021 int
12022 sctp_send_stream_reset_out_if_possible(struct sctp_tcb *stcb, int so_locked)
12023 {
12024         struct sctp_association *asoc;
12025         struct sctp_tmit_chunk *chk;
12026         struct sctp_chunkhdr *ch;
12027         uint32_t seq;
12028
12029         asoc = &stcb->asoc;
12030         asoc->trigger_reset = 0;
12031         if (asoc->stream_reset_outstanding) {
12032                 return (EALREADY);
12033         }
12034         sctp_alloc_a_chunk(stcb, chk);
12035         if (chk == NULL) {
12036                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12037                 return (ENOMEM);
12038         }
12039         chk->copy_by_ref = 0;
12040         chk->rec.chunk_id.id = SCTP_STREAM_RESET;
12041         chk->rec.chunk_id.can_take_data = 0;
12042         chk->flags = 0;
12043         chk->asoc = &stcb->asoc;
12044         chk->book_size = sizeof(struct sctp_chunkhdr);
12045         chk->send_size = SCTP_SIZE32(chk->book_size);
12046         chk->book_size_scale = 0;
12047         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
12048         if (chk->data == NULL) {
12049                 sctp_free_a_chunk(stcb, chk, so_locked);
12050                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12051                 return (ENOMEM);
12052         }
12053         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
12054
12055         /* setup chunk parameters */
12056         chk->sent = SCTP_DATAGRAM_UNSENT;
12057         chk->snd_count = 0;
12058         if (stcb->asoc.alternate) {
12059                 chk->whoTo = stcb->asoc.alternate;
12060         } else {
12061                 chk->whoTo = stcb->asoc.primary_destination;
12062         }
12063         ch = mtod(chk->data, struct sctp_chunkhdr *);
12064         ch->chunk_type = SCTP_STREAM_RESET;
12065         ch->chunk_flags = 0;
12066         ch->chunk_length = htons(chk->book_size);
12067         atomic_add_int(&chk->whoTo->ref_count, 1);
12068         SCTP_BUF_LEN(chk->data) = chk->send_size;
12069         seq = stcb->asoc.str_reset_seq_out;
12070         if (sctp_add_stream_reset_out(stcb, chk, seq, (stcb->asoc.str_reset_seq_in - 1), (stcb->asoc.sending_seq - 1))) {
12071                 seq++;
12072                 asoc->stream_reset_outstanding++;
12073         } else {
12074                 m_freem(chk->data);
12075                 chk->data = NULL;
12076                 sctp_free_a_chunk(stcb, chk, so_locked);
12077                 return (ENOENT);
12078         }
12079         asoc->str_reset = chk;
12080         /* insert the chunk for sending */
12081         TAILQ_INSERT_TAIL(&asoc->control_send_queue,
12082             chk,
12083             sctp_next);
12084         asoc->ctrl_queue_cnt++;
12085
12086         if (stcb->asoc.send_sack) {
12087                 sctp_send_sack(stcb, so_locked);
12088         }
12089         sctp_timer_start(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb, chk->whoTo);
12090         return (0);
12091 }
12092
12093 int
12094 sctp_send_str_reset_req(struct sctp_tcb *stcb,
12095     uint16_t number_entries, uint16_t * list,
12096     uint8_t send_in_req,
12097     uint8_t send_tsn_req,
12098     uint8_t add_stream,
12099     uint16_t adding_o,
12100     uint16_t adding_i, uint8_t peer_asked)
12101 {
12102         struct sctp_association *asoc;
12103         struct sctp_tmit_chunk *chk;
12104         struct sctp_chunkhdr *ch;
12105         int can_send_out_req = 0;
12106         uint32_t seq;
12107
12108         asoc = &stcb->asoc;
12109         if (asoc->stream_reset_outstanding) {
12110                 /*-
12111                  * Already one pending, must get ACK back to clear the flag.
12112                  */
12113                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EBUSY);
12114                 return (EBUSY);
12115         }
12116         if ((send_in_req == 0) && (send_tsn_req == 0) &&
12117             (add_stream == 0)) {
12118                 /* nothing to do */
12119                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12120                 return (EINVAL);
12121         }
12122         if (send_tsn_req && send_in_req) {
12123                 /* error, can't do that */
12124                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12125                 return (EINVAL);
12126         } else if (send_in_req) {
12127                 can_send_out_req = 1;
12128         }
12129         if (number_entries > (MCLBYTES -
12130             SCTP_MIN_OVERHEAD -
12131             sizeof(struct sctp_chunkhdr) -
12132             sizeof(struct sctp_stream_reset_out_request)) /
12133             sizeof(uint16_t)) {
12134                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12135                 return (ENOMEM);
12136         }
12137         sctp_alloc_a_chunk(stcb, chk);
12138         if (chk == NULL) {
12139                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12140                 return (ENOMEM);
12141         }
12142         chk->copy_by_ref = 0;
12143         chk->rec.chunk_id.id = SCTP_STREAM_RESET;
12144         chk->rec.chunk_id.can_take_data = 0;
12145         chk->flags = 0;
12146         chk->asoc = &stcb->asoc;
12147         chk->book_size = sizeof(struct sctp_chunkhdr);
12148         chk->send_size = SCTP_SIZE32(chk->book_size);
12149         chk->book_size_scale = 0;
12150
12151         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
12152         if (chk->data == NULL) {
12153                 sctp_free_a_chunk(stcb, chk, SCTP_SO_LOCKED);
12154                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12155                 return (ENOMEM);
12156         }
12157         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
12158
12159         /* setup chunk parameters */
12160         chk->sent = SCTP_DATAGRAM_UNSENT;
12161         chk->snd_count = 0;
12162         if (stcb->asoc.alternate) {
12163                 chk->whoTo = stcb->asoc.alternate;
12164         } else {
12165                 chk->whoTo = stcb->asoc.primary_destination;
12166         }
12167         atomic_add_int(&chk->whoTo->ref_count, 1);
12168         ch = mtod(chk->data, struct sctp_chunkhdr *);
12169         ch->chunk_type = SCTP_STREAM_RESET;
12170         ch->chunk_flags = 0;
12171         ch->chunk_length = htons(chk->book_size);
12172         SCTP_BUF_LEN(chk->data) = chk->send_size;
12173
12174         seq = stcb->asoc.str_reset_seq_out;
12175         if (can_send_out_req) {
12176                 int ret;
12177
12178                 ret = sctp_add_stream_reset_out(stcb, chk, seq, (stcb->asoc.str_reset_seq_in - 1), (stcb->asoc.sending_seq - 1));
12179                 if (ret) {
12180                         seq++;
12181                         asoc->stream_reset_outstanding++;
12182                 }
12183         }
12184         if ((add_stream & 1) &&
12185             ((stcb->asoc.strm_realoutsize - stcb->asoc.streamoutcnt) < adding_o)) {
12186                 /* Need to allocate more */
12187                 struct sctp_stream_out *oldstream;
12188                 struct sctp_stream_queue_pending *sp, *nsp;
12189                 int i;
12190 #if defined(SCTP_DETAILED_STR_STATS)
12191                 int j;
12192 #endif
12193
12194                 oldstream = stcb->asoc.strmout;
12195                 /* get some more */
12196                 SCTP_MALLOC(stcb->asoc.strmout, struct sctp_stream_out *,
12197                     (stcb->asoc.streamoutcnt + adding_o) * sizeof(struct sctp_stream_out),
12198                     SCTP_M_STRMO);
12199                 if (stcb->asoc.strmout == NULL) {
12200                         uint8_t x;
12201
12202                         stcb->asoc.strmout = oldstream;
12203                         /* Turn off the bit */
12204                         x = add_stream & 0xfe;
12205                         add_stream = x;
12206                         goto skip_stuff;
12207                 }
12208                 /*
12209                  * Ok now we proceed with copying the old out stuff and
12210                  * initializing the new stuff.
12211                  */
12212                 SCTP_TCB_SEND_LOCK(stcb);
12213                 stcb->asoc.ss_functions.sctp_ss_clear(stcb, &stcb->asoc, 0, 1);
12214                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
12215                         TAILQ_INIT(&stcb->asoc.strmout[i].outqueue);
12216                         stcb->asoc.strmout[i].chunks_on_queues = oldstream[i].chunks_on_queues;
12217                         stcb->asoc.strmout[i].next_mid_ordered = oldstream[i].next_mid_ordered;
12218                         stcb->asoc.strmout[i].next_mid_unordered = oldstream[i].next_mid_unordered;
12219                         stcb->asoc.strmout[i].last_msg_incomplete = oldstream[i].last_msg_incomplete;
12220                         stcb->asoc.strmout[i].sid = i;
12221                         stcb->asoc.strmout[i].state = oldstream[i].state;
12222                         /* FIX ME FIX ME */
12223                         /*
12224                          * This should be a SS_COPY operation FIX ME STREAM
12225                          * SCHEDULER EXPERT
12226                          */
12227                         stcb->asoc.ss_functions.sctp_ss_init_stream(stcb, &stcb->asoc.strmout[i], &oldstream[i]);
12228                         /* now anything on those queues? */
12229                         TAILQ_FOREACH_SAFE(sp, &oldstream[i].outqueue, next, nsp) {
12230                                 TAILQ_REMOVE(&oldstream[i].outqueue, sp, next);
12231                                 TAILQ_INSERT_TAIL(&stcb->asoc.strmout[i].outqueue, sp, next);
12232                         }
12233
12234                 }
12235                 /* now the new streams */
12236                 stcb->asoc.ss_functions.sctp_ss_init(stcb, &stcb->asoc, 1);
12237                 for (i = stcb->asoc.streamoutcnt; i < (stcb->asoc.streamoutcnt + adding_o); i++) {
12238                         TAILQ_INIT(&stcb->asoc.strmout[i].outqueue);
12239                         stcb->asoc.strmout[i].chunks_on_queues = 0;
12240 #if defined(SCTP_DETAILED_STR_STATS)
12241                         for (j = 0; j < SCTP_PR_SCTP_MAX + 1; j++) {
12242                                 stcb->asoc.strmout[i].abandoned_sent[j] = 0;
12243                                 stcb->asoc.strmout[i].abandoned_unsent[j] = 0;
12244                         }
12245 #else
12246                         stcb->asoc.strmout[i].abandoned_sent[0] = 0;
12247                         stcb->asoc.strmout[i].abandoned_unsent[0] = 0;
12248 #endif
12249                         stcb->asoc.strmout[i].next_mid_ordered = 0;
12250                         stcb->asoc.strmout[i].next_mid_unordered = 0;
12251                         stcb->asoc.strmout[i].sid = i;
12252                         stcb->asoc.strmout[i].last_msg_incomplete = 0;
12253                         stcb->asoc.ss_functions.sctp_ss_init_stream(stcb, &stcb->asoc.strmout[i], NULL);
12254                         stcb->asoc.strmout[i].state = SCTP_STREAM_CLOSED;
12255                 }
12256                 stcb->asoc.strm_realoutsize = stcb->asoc.streamoutcnt + adding_o;
12257                 SCTP_FREE(oldstream, SCTP_M_STRMO);
12258                 SCTP_TCB_SEND_UNLOCK(stcb);
12259         }
12260 skip_stuff:
12261         if ((add_stream & 1) && (adding_o > 0)) {
12262                 asoc->strm_pending_add_size = adding_o;
12263                 asoc->peer_req_out = peer_asked;
12264                 sctp_add_an_out_stream(chk, seq, adding_o);
12265                 seq++;
12266                 asoc->stream_reset_outstanding++;
12267         }
12268         if ((add_stream & 2) && (adding_i > 0)) {
12269                 sctp_add_an_in_stream(chk, seq, adding_i);
12270                 seq++;
12271                 asoc->stream_reset_outstanding++;
12272         }
12273         if (send_in_req) {
12274                 sctp_add_stream_reset_in(chk, number_entries, list, seq);
12275                 seq++;
12276                 asoc->stream_reset_outstanding++;
12277         }
12278         if (send_tsn_req) {
12279                 sctp_add_stream_reset_tsn(chk, seq);
12280                 asoc->stream_reset_outstanding++;
12281         }
12282         asoc->str_reset = chk;
12283         /* insert the chunk for sending */
12284         TAILQ_INSERT_TAIL(&asoc->control_send_queue,
12285             chk,
12286             sctp_next);
12287         asoc->ctrl_queue_cnt++;
12288         if (stcb->asoc.send_sack) {
12289                 sctp_send_sack(stcb, SCTP_SO_LOCKED);
12290         }
12291         sctp_timer_start(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb, chk->whoTo);
12292         return (0);
12293 }
12294
12295 void
12296 sctp_send_abort(struct mbuf *m, int iphlen, struct sockaddr *src, struct sockaddr *dst,
12297     struct sctphdr *sh, uint32_t vtag, struct mbuf *cause,
12298     uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum,
12299     uint32_t vrf_id, uint16_t port)
12300 {
12301         /* Don't respond to an ABORT with an ABORT. */
12302         if (sctp_is_there_an_abort_here(m, iphlen, &vtag)) {
12303                 if (cause)
12304                         sctp_m_freem(cause);
12305                 return;
12306         }
12307         sctp_send_resp_msg(src, dst, sh, vtag, SCTP_ABORT_ASSOCIATION, cause,
12308             mflowtype, mflowid, fibnum,
12309             vrf_id, port);
12310         return;
12311 }
12312
12313 void
12314 sctp_send_operr_to(struct sockaddr *src, struct sockaddr *dst,
12315     struct sctphdr *sh, uint32_t vtag, struct mbuf *cause,
12316     uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum,
12317     uint32_t vrf_id, uint16_t port)
12318 {
12319         sctp_send_resp_msg(src, dst, sh, vtag, SCTP_OPERATION_ERROR, cause,
12320             mflowtype, mflowid, fibnum,
12321             vrf_id, port);
12322         return;
12323 }
12324
12325 static struct mbuf *
12326 sctp_copy_resume(struct uio *uio,
12327     int max_send_len,
12328     int user_marks_eor,
12329     int *error,
12330     uint32_t * sndout,
12331     struct mbuf **new_tail)
12332 {
12333         struct mbuf *m;
12334
12335         m = m_uiotombuf(uio, M_WAITOK, max_send_len, 0,
12336             (M_PKTHDR | (user_marks_eor ? M_EOR : 0)));
12337         if (m == NULL) {
12338                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOBUFS);
12339                 *error = ENOBUFS;
12340         } else {
12341                 *sndout = m_length(m, NULL);
12342                 *new_tail = m_last(m);
12343         }
12344         return (m);
12345 }
12346
12347 static int
12348 sctp_copy_one(struct sctp_stream_queue_pending *sp,
12349     struct uio *uio,
12350     int resv_upfront)
12351 {
12352         sp->data = m_uiotombuf(uio, M_WAITOK, sp->length,
12353             resv_upfront, 0);
12354         if (sp->data == NULL) {
12355                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOBUFS);
12356                 return (ENOBUFS);
12357         }
12358
12359         sp->tail_mbuf = m_last(sp->data);
12360         return (0);
12361 }
12362
12363
12364
12365 static struct sctp_stream_queue_pending *
12366 sctp_copy_it_in(struct sctp_tcb *stcb,
12367     struct sctp_association *asoc,
12368     struct sctp_sndrcvinfo *srcv,
12369     struct uio *uio,
12370     struct sctp_nets *net,
12371     int max_send_len,
12372     int user_marks_eor,
12373     int *error)
12374 {
12375
12376         /*-
12377          * This routine must be very careful in its work. Protocol
12378          * processing is up and running so care must be taken to spl...()
12379          * when you need to do something that may effect the stcb/asoc. The
12380          * sb is locked however. When data is copied the protocol processing
12381          * should be enabled since this is a slower operation...
12382          */
12383         struct sctp_stream_queue_pending *sp = NULL;
12384         int resv_in_first;
12385
12386         *error = 0;
12387         /* Now can we send this? */
12388         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_SENT) ||
12389             (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) ||
12390             (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED) ||
12391             (asoc->state & SCTP_STATE_SHUTDOWN_PENDING)) {
12392                 /* got data while shutting down */
12393                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
12394                 *error = ECONNRESET;
12395                 goto out_now;
12396         }
12397         sctp_alloc_a_strmoq(stcb, sp);
12398         if (sp == NULL) {
12399                 SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12400                 *error = ENOMEM;
12401                 goto out_now;
12402         }
12403         sp->act_flags = 0;
12404         sp->sender_all_done = 0;
12405         sp->sinfo_flags = srcv->sinfo_flags;
12406         sp->timetolive = srcv->sinfo_timetolive;
12407         sp->ppid = srcv->sinfo_ppid;
12408         sp->context = srcv->sinfo_context;
12409         sp->fsn = 0;
12410         (void)SCTP_GETTIME_TIMEVAL(&sp->ts);
12411
12412         sp->sid = srcv->sinfo_stream;
12413         sp->length = (uint32_t) min(uio->uio_resid, max_send_len);
12414         if ((sp->length == (uint32_t) uio->uio_resid) &&
12415             ((user_marks_eor == 0) ||
12416             (srcv->sinfo_flags & SCTP_EOF) ||
12417             (user_marks_eor && (srcv->sinfo_flags & SCTP_EOR)))) {
12418                 sp->msg_is_complete = 1;
12419         } else {
12420                 sp->msg_is_complete = 0;
12421         }
12422         sp->sender_all_done = 0;
12423         sp->some_taken = 0;
12424         sp->put_last_out = 0;
12425         resv_in_first = SCTP_DATA_CHUNK_OVERHEAD(stcb);
12426         sp->data = sp->tail_mbuf = NULL;
12427         if (sp->length == 0) {
12428                 goto skip_copy;
12429         }
12430         if (srcv->sinfo_keynumber_valid) {
12431                 sp->auth_keyid = srcv->sinfo_keynumber;
12432         } else {
12433                 sp->auth_keyid = stcb->asoc.authinfo.active_keyid;
12434         }
12435         if (sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks)) {
12436                 sctp_auth_key_acquire(stcb, sp->auth_keyid);
12437                 sp->holds_key_ref = 1;
12438         }
12439         *error = sctp_copy_one(sp, uio, resv_in_first);
12440 skip_copy:
12441         if (*error) {
12442                 sctp_free_a_strmoq(stcb, sp, SCTP_SO_LOCKED);
12443                 sp = NULL;
12444         } else {
12445                 if (sp->sinfo_flags & SCTP_ADDR_OVER) {
12446                         sp->net = net;
12447                         atomic_add_int(&sp->net->ref_count, 1);
12448                 } else {
12449                         sp->net = NULL;
12450                 }
12451                 sctp_set_prsctp_policy(sp);
12452         }
12453 out_now:
12454         return (sp);
12455 }
12456
12457
12458 int
12459 sctp_sosend(struct socket *so,
12460     struct sockaddr *addr,
12461     struct uio *uio,
12462     struct mbuf *top,
12463     struct mbuf *control,
12464     int flags,
12465     struct thread *p
12466 )
12467 {
12468         int error, use_sndinfo = 0;
12469         struct sctp_sndrcvinfo sndrcvninfo;
12470         struct sockaddr *addr_to_use;
12471 #if defined(INET) && defined(INET6)
12472         struct sockaddr_in sin;
12473 #endif
12474
12475         if (control) {
12476                 /* process cmsg snd/rcv info (maybe a assoc-id) */
12477                 if (sctp_find_cmsg(SCTP_SNDRCV, (void *)&sndrcvninfo, control,
12478                     sizeof(sndrcvninfo))) {
12479                         /* got one */
12480                         use_sndinfo = 1;
12481                 }
12482         }
12483         addr_to_use = addr;
12484 #if defined(INET) && defined(INET6)
12485         if ((addr) && (addr->sa_family == AF_INET6)) {
12486                 struct sockaddr_in6 *sin6;
12487
12488                 sin6 = (struct sockaddr_in6 *)addr;
12489                 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
12490                         in6_sin6_2_sin(&sin, sin6);
12491                         addr_to_use = (struct sockaddr *)&sin;
12492                 }
12493         }
12494 #endif
12495         error = sctp_lower_sosend(so, addr_to_use, uio, top,
12496             control,
12497             flags,
12498             use_sndinfo ? &sndrcvninfo : NULL
12499             ,p
12500             );
12501         return (error);
12502 }
12503
12504
12505 int
12506 sctp_lower_sosend(struct socket *so,
12507     struct sockaddr *addr,
12508     struct uio *uio,
12509     struct mbuf *i_pak,
12510     struct mbuf *control,
12511     int flags,
12512     struct sctp_sndrcvinfo *srcv
12513     ,
12514     struct thread *p
12515 )
12516 {
12517         unsigned int sndlen = 0, max_len;
12518         int error, len;
12519         struct mbuf *top = NULL;
12520         int queue_only = 0, queue_only_for_init = 0;
12521         int free_cnt_applied = 0;
12522         int un_sent;
12523         int now_filled = 0;
12524         unsigned int inqueue_bytes = 0;
12525         struct sctp_block_entry be;
12526         struct sctp_inpcb *inp;
12527         struct sctp_tcb *stcb = NULL;
12528         struct timeval now;
12529         struct sctp_nets *net;
12530         struct sctp_association *asoc;
12531         struct sctp_inpcb *t_inp;
12532         int user_marks_eor;
12533         int create_lock_applied = 0;
12534         int nagle_applies = 0;
12535         int some_on_control = 0;
12536         int got_all_of_the_send = 0;
12537         int hold_tcblock = 0;
12538         int non_blocking = 0;
12539         uint32_t local_add_more, local_soresv = 0;
12540         uint16_t port;
12541         uint16_t sinfo_flags;
12542         sctp_assoc_t sinfo_assoc_id;
12543
12544         error = 0;
12545         net = NULL;
12546         stcb = NULL;
12547         asoc = NULL;
12548
12549         t_inp = inp = (struct sctp_inpcb *)so->so_pcb;
12550         if (inp == NULL) {
12551                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12552                 error = EINVAL;
12553                 if (i_pak) {
12554                         SCTP_RELEASE_PKT(i_pak);
12555                 }
12556                 return (error);
12557         }
12558         if ((uio == NULL) && (i_pak == NULL)) {
12559                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12560                 return (EINVAL);
12561         }
12562         user_marks_eor = sctp_is_feature_on(inp, SCTP_PCB_FLAGS_EXPLICIT_EOR);
12563         atomic_add_int(&inp->total_sends, 1);
12564         if (uio) {
12565                 if (uio->uio_resid < 0) {
12566                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12567                         return (EINVAL);
12568                 }
12569                 sndlen = (unsigned int)uio->uio_resid;
12570         } else {
12571                 top = SCTP_HEADER_TO_CHAIN(i_pak);
12572                 sndlen = SCTP_HEADER_LEN(i_pak);
12573         }
12574         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Send called addr:%p send length %d\n",
12575             (void *)addr,
12576             sndlen);
12577         if ((inp->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) &&
12578             SCTP_IS_LISTENING(inp)) {
12579                 /* The listener can NOT send */
12580                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOTCONN);
12581                 error = ENOTCONN;
12582                 goto out_unlocked;
12583         }
12584         /**
12585          * Pre-screen address, if one is given the sin-len
12586          * must be set correctly!
12587          */
12588         if (addr) {
12589                 union sctp_sockstore *raddr = (union sctp_sockstore *)addr;
12590
12591                 switch (raddr->sa.sa_family) {
12592 #ifdef INET
12593                 case AF_INET:
12594                         if (raddr->sin.sin_len != sizeof(struct sockaddr_in)) {
12595                                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12596                                 error = EINVAL;
12597                                 goto out_unlocked;
12598                         }
12599                         port = raddr->sin.sin_port;
12600                         break;
12601 #endif
12602 #ifdef INET6
12603                 case AF_INET6:
12604                         if (raddr->sin6.sin6_len != sizeof(struct sockaddr_in6)) {
12605                                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12606                                 error = EINVAL;
12607                                 goto out_unlocked;
12608                         }
12609                         port = raddr->sin6.sin6_port;
12610                         break;
12611 #endif
12612                 default:
12613                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EAFNOSUPPORT);
12614                         error = EAFNOSUPPORT;
12615                         goto out_unlocked;
12616                 }
12617         } else
12618                 port = 0;
12619
12620         if (srcv) {
12621                 sinfo_flags = srcv->sinfo_flags;
12622                 sinfo_assoc_id = srcv->sinfo_assoc_id;
12623                 if (INVALID_SINFO_FLAG(sinfo_flags) ||
12624                     PR_SCTP_INVALID_POLICY(sinfo_flags)) {
12625                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12626                         error = EINVAL;
12627                         goto out_unlocked;
12628                 }
12629                 if (srcv->sinfo_flags)
12630                         SCTP_STAT_INCR(sctps_sends_with_flags);
12631         } else {
12632                 sinfo_flags = inp->def_send.sinfo_flags;
12633                 sinfo_assoc_id = inp->def_send.sinfo_assoc_id;
12634         }
12635         if (sinfo_flags & SCTP_SENDALL) {
12636                 /* its a sendall */
12637                 error = sctp_sendall(inp, uio, top, srcv);
12638                 top = NULL;
12639                 goto out_unlocked;
12640         }
12641         if ((sinfo_flags & SCTP_ADDR_OVER) && (addr == NULL)) {
12642                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12643                 error = EINVAL;
12644                 goto out_unlocked;
12645         }
12646         /* now we must find the assoc */
12647         if ((inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) ||
12648             (inp->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) {
12649                 SCTP_INP_RLOCK(inp);
12650                 stcb = LIST_FIRST(&inp->sctp_asoc_list);
12651                 if (stcb) {
12652                         SCTP_TCB_LOCK(stcb);
12653                         hold_tcblock = 1;
12654                 }
12655                 SCTP_INP_RUNLOCK(inp);
12656         } else if (sinfo_assoc_id) {
12657                 stcb = sctp_findassociation_ep_asocid(inp, sinfo_assoc_id, 1);
12658                 if (stcb != NULL) {
12659                         hold_tcblock = 1;
12660                 }
12661         } else if (addr) {
12662                 /*-
12663                  * Since we did not use findep we must
12664                  * increment it, and if we don't find a tcb
12665                  * decrement it.
12666                  */
12667                 SCTP_INP_WLOCK(inp);
12668                 SCTP_INP_INCR_REF(inp);
12669                 SCTP_INP_WUNLOCK(inp);
12670                 stcb = sctp_findassociation_ep_addr(&t_inp, addr, &net, NULL, NULL);
12671                 if (stcb == NULL) {
12672                         SCTP_INP_WLOCK(inp);
12673                         SCTP_INP_DECR_REF(inp);
12674                         SCTP_INP_WUNLOCK(inp);
12675                 } else {
12676                         hold_tcblock = 1;
12677                 }
12678         }
12679         if ((stcb == NULL) && (addr)) {
12680                 /* Possible implicit send? */
12681                 SCTP_ASOC_CREATE_LOCK(inp);
12682                 create_lock_applied = 1;
12683                 if ((inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) ||
12684                     (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE)) {
12685                         /* Should I really unlock ? */
12686                         SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12687                         error = EINVAL;
12688                         goto out_unlocked;
12689
12690                 }
12691                 if (((inp->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) == 0) &&
12692                     (addr->sa_family == AF_INET6)) {
12693                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12694                         error = EINVAL;
12695                         goto out_unlocked;
12696                 }
12697                 SCTP_INP_WLOCK(inp);
12698                 SCTP_INP_INCR_REF(inp);
12699                 SCTP_INP_WUNLOCK(inp);
12700                 /* With the lock applied look again */
12701                 stcb = sctp_findassociation_ep_addr(&t_inp, addr, &net, NULL, NULL);
12702                 if ((stcb == NULL) && (control != NULL) && (port > 0)) {
12703                         stcb = sctp_findassociation_cmsgs(&t_inp, port, control, &net, &error);
12704                 }
12705                 if (stcb == NULL) {
12706                         SCTP_INP_WLOCK(inp);
12707                         SCTP_INP_DECR_REF(inp);
12708                         SCTP_INP_WUNLOCK(inp);
12709                 } else {
12710                         hold_tcblock = 1;
12711                 }
12712                 if (error) {
12713                         goto out_unlocked;
12714                 }
12715                 if (t_inp != inp) {
12716                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOTCONN);
12717                         error = ENOTCONN;
12718                         goto out_unlocked;
12719                 }
12720         }
12721         if (stcb == NULL) {
12722                 if (addr == NULL) {
12723                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOENT);
12724                         error = ENOENT;
12725                         goto out_unlocked;
12726                 } else {
12727                         /* We must go ahead and start the INIT process */
12728                         uint32_t vrf_id;
12729
12730                         if ((sinfo_flags & SCTP_ABORT) ||
12731                             ((sinfo_flags & SCTP_EOF) && (sndlen == 0))) {
12732                                 /*-
12733                                  * User asks to abort a non-existant assoc,
12734                                  * or EOF a non-existant assoc with no data
12735                                  */
12736                                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOENT);
12737                                 error = ENOENT;
12738                                 goto out_unlocked;
12739                         }
12740                         /* get an asoc/stcb struct */
12741                         vrf_id = inp->def_vrf_id;
12742 #ifdef INVARIANTS
12743                         if (create_lock_applied == 0) {
12744                                 panic("Error, should hold create lock and I don't?");
12745                         }
12746 #endif
12747                         stcb = sctp_aloc_assoc(inp, addr, &error, 0, vrf_id,
12748                             inp->sctp_ep.pre_open_stream_count,
12749                             inp->sctp_ep.port,
12750                             p);
12751                         if (stcb == NULL) {
12752                                 /* Error is setup for us in the call */
12753                                 goto out_unlocked;
12754                         }
12755                         if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) {
12756                                 stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED;
12757                                 /*
12758                                  * Set the connected flag so we can queue
12759                                  * data
12760                                  */
12761                                 soisconnecting(so);
12762                         }
12763                         hold_tcblock = 1;
12764                         if (create_lock_applied) {
12765                                 SCTP_ASOC_CREATE_UNLOCK(inp);
12766                                 create_lock_applied = 0;
12767                         } else {
12768                                 SCTP_PRINTF("Huh-3? create lock should have been on??\n");
12769                         }
12770                         /*
12771                          * Turn on queue only flag to prevent data from
12772                          * being sent
12773                          */
12774                         queue_only = 1;
12775                         asoc = &stcb->asoc;
12776                         SCTP_SET_STATE(asoc, SCTP_STATE_COOKIE_WAIT);
12777                         (void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered);
12778
12779                         /* initialize authentication params for the assoc */
12780                         sctp_initialize_auth_params(inp, stcb);
12781
12782                         if (control) {
12783                                 if (sctp_process_cmsgs_for_init(stcb, control, &error)) {
12784                                         sctp_free_assoc(inp, stcb, SCTP_PCBFREE_FORCE,
12785                                             SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_5);
12786                                         hold_tcblock = 0;
12787                                         stcb = NULL;
12788                                         goto out_unlocked;
12789                                 }
12790                         }
12791                         /* out with the INIT */
12792                         queue_only_for_init = 1;
12793                         /*-
12794                          * we may want to dig in after this call and adjust the MTU
12795                          * value. It defaulted to 1500 (constant) but the ro
12796                          * structure may now have an update and thus we may need to
12797                          * change it BEFORE we append the message.
12798                          */
12799                 }
12800         } else
12801                 asoc = &stcb->asoc;
12802         if (srcv == NULL)
12803                 srcv = (struct sctp_sndrcvinfo *)&asoc->def_send;
12804         if (srcv->sinfo_flags & SCTP_ADDR_OVER) {
12805                 if (addr)
12806                         net = sctp_findnet(stcb, addr);
12807                 else
12808                         net = NULL;
12809                 if ((net == NULL) ||
12810                     ((port != 0) && (port != stcb->rport))) {
12811                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12812                         error = EINVAL;
12813                         goto out_unlocked;
12814                 }
12815         } else {
12816                 if (stcb->asoc.alternate) {
12817                         net = stcb->asoc.alternate;
12818                 } else {
12819                         net = stcb->asoc.primary_destination;
12820                 }
12821         }
12822         atomic_add_int(&stcb->total_sends, 1);
12823         /* Keep the stcb from being freed under our feet */
12824         atomic_add_int(&asoc->refcnt, 1);
12825         free_cnt_applied = 1;
12826
12827         if (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_NO_FRAGMENT)) {
12828                 if (sndlen > asoc->smallest_mtu) {
12829                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EMSGSIZE);
12830                         error = EMSGSIZE;
12831                         goto out_unlocked;
12832                 }
12833         }
12834         if (SCTP_SO_IS_NBIO(so)
12835             || (flags & MSG_NBIO)
12836             ) {
12837                 non_blocking = 1;
12838         }
12839         /* would we block? */
12840         if (non_blocking) {
12841                 uint32_t amount;
12842
12843                 if (hold_tcblock == 0) {
12844                         SCTP_TCB_LOCK(stcb);
12845                         hold_tcblock = 1;
12846                 }
12847                 inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * SCTP_DATA_CHUNK_OVERHEAD(stcb));
12848                 if (user_marks_eor == 0) {
12849                         amount = sndlen;
12850                 } else {
12851                         amount = 1;
12852                 }
12853                 if ((SCTP_SB_LIMIT_SND(so) < (amount + inqueue_bytes + stcb->asoc.sb_send_resv)) ||
12854                     (stcb->asoc.chunks_on_out_queue >= SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue))) {
12855                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EWOULDBLOCK);
12856                         if (sndlen > SCTP_SB_LIMIT_SND(so))
12857                                 error = EMSGSIZE;
12858                         else
12859                                 error = EWOULDBLOCK;
12860                         goto out_unlocked;
12861                 }
12862                 stcb->asoc.sb_send_resv += sndlen;
12863                 SCTP_TCB_UNLOCK(stcb);
12864                 hold_tcblock = 0;
12865         } else {
12866                 atomic_add_int(&stcb->asoc.sb_send_resv, sndlen);
12867         }
12868         local_soresv = sndlen;
12869         if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
12870                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
12871                 error = ECONNRESET;
12872                 goto out_unlocked;
12873         }
12874         if (create_lock_applied) {
12875                 SCTP_ASOC_CREATE_UNLOCK(inp);
12876                 create_lock_applied = 0;
12877         }
12878         /* Is the stream no. valid? */
12879         if (srcv->sinfo_stream >= asoc->streamoutcnt) {
12880                 /* Invalid stream number */
12881                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12882                 error = EINVAL;
12883                 goto out_unlocked;
12884         }
12885         if ((asoc->strmout[srcv->sinfo_stream].state != SCTP_STREAM_OPEN) &&
12886             (asoc->strmout[srcv->sinfo_stream].state != SCTP_STREAM_OPENING)) {
12887                 /*
12888                  * Can't queue any data while stream reset is underway.
12889                  */
12890                 if (asoc->strmout[srcv->sinfo_stream].state > SCTP_STREAM_OPEN) {
12891                         error = EAGAIN;
12892                 } else {
12893                         error = EINVAL;
12894                 }
12895                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, error);
12896                 goto out_unlocked;
12897         }
12898         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) ||
12899             (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)) {
12900                 queue_only = 1;
12901         }
12902         /* we are now done with all control */
12903         if (control) {
12904                 sctp_m_freem(control);
12905                 control = NULL;
12906         }
12907         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_SENT) ||
12908             (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED) ||
12909             (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) ||
12910             (asoc->state & SCTP_STATE_SHUTDOWN_PENDING)) {
12911                 if (srcv->sinfo_flags & SCTP_ABORT) {
12912                         ;
12913                 } else {
12914                         SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
12915                         error = ECONNRESET;
12916                         goto out_unlocked;
12917                 }
12918         }
12919         /* Ok, we will attempt a msgsnd :> */
12920         if (p) {
12921                 p->td_ru.ru_msgsnd++;
12922         }
12923         /* Are we aborting? */
12924         if (srcv->sinfo_flags & SCTP_ABORT) {
12925                 struct mbuf *mm;
12926                 int tot_demand, tot_out = 0, max_out;
12927
12928                 SCTP_STAT_INCR(sctps_sends_with_abort);
12929                 if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) ||
12930                     (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)) {
12931                         /* It has to be up before we abort */
12932                         /* how big is the user initiated abort? */
12933                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12934                         error = EINVAL;
12935                         goto out;
12936                 }
12937                 if (hold_tcblock) {
12938                         SCTP_TCB_UNLOCK(stcb);
12939                         hold_tcblock = 0;
12940                 }
12941                 if (top) {
12942                         struct mbuf *cntm = NULL;
12943
12944                         mm = sctp_get_mbuf_for_msg(sizeof(struct sctp_paramhdr), 0, M_WAITOK, 1, MT_DATA);
12945                         if (sndlen != 0) {
12946                                 for (cntm = top; cntm; cntm = SCTP_BUF_NEXT(cntm)) {
12947                                         tot_out += SCTP_BUF_LEN(cntm);
12948                                 }
12949                         }
12950                 } else {
12951                         /* Must fit in a MTU */
12952                         tot_out = sndlen;
12953                         tot_demand = (tot_out + sizeof(struct sctp_paramhdr));
12954                         if (tot_demand > SCTP_DEFAULT_ADD_MORE) {
12955                                 /* To big */
12956                                 SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EMSGSIZE);
12957                                 error = EMSGSIZE;
12958                                 goto out;
12959                         }
12960                         mm = sctp_get_mbuf_for_msg(tot_demand, 0, M_WAITOK, 1, MT_DATA);
12961                 }
12962                 if (mm == NULL) {
12963                         SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12964                         error = ENOMEM;
12965                         goto out;
12966                 }
12967                 max_out = asoc->smallest_mtu - sizeof(struct sctp_paramhdr);
12968                 max_out -= sizeof(struct sctp_abort_msg);
12969                 if (tot_out > max_out) {
12970                         tot_out = max_out;
12971                 }
12972                 if (mm) {
12973                         struct sctp_paramhdr *ph;
12974
12975                         /* now move forward the data pointer */
12976                         ph = mtod(mm, struct sctp_paramhdr *);
12977                         ph->param_type = htons(SCTP_CAUSE_USER_INITIATED_ABT);
12978                         ph->param_length = htons((uint16_t) (sizeof(struct sctp_paramhdr) + tot_out));
12979                         ph++;
12980                         SCTP_BUF_LEN(mm) = tot_out + sizeof(struct sctp_paramhdr);
12981                         if (top == NULL) {
12982                                 error = uiomove((caddr_t)ph, (int)tot_out, uio);
12983                                 if (error) {
12984                                         /*-
12985                                          * Here if we can't get his data we
12986                                          * still abort we just don't get to
12987                                          * send the users note :-0
12988                                          */
12989                                         sctp_m_freem(mm);
12990                                         mm = NULL;
12991                                 }
12992                         } else {
12993                                 if (sndlen != 0) {
12994                                         SCTP_BUF_NEXT(mm) = top;
12995                                 }
12996                         }
12997                 }
12998                 if (hold_tcblock == 0) {
12999                         SCTP_TCB_LOCK(stcb);
13000                 }
13001                 atomic_add_int(&stcb->asoc.refcnt, -1);
13002                 free_cnt_applied = 0;
13003                 /* release this lock, otherwise we hang on ourselves */
13004                 sctp_abort_an_association(stcb->sctp_ep, stcb, mm, SCTP_SO_LOCKED);
13005                 /* now relock the stcb so everything is sane */
13006                 hold_tcblock = 0;
13007                 stcb = NULL;
13008                 /*
13009                  * In this case top is already chained to mm avoid double
13010                  * free, since we free it below if top != NULL and driver
13011                  * would free it after sending the packet out
13012                  */
13013                 if (sndlen != 0) {
13014                         top = NULL;
13015                 }
13016                 goto out_unlocked;
13017         }
13018         /* Calculate the maximum we can send */
13019         inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * SCTP_DATA_CHUNK_OVERHEAD(stcb));
13020         if (SCTP_SB_LIMIT_SND(so) > inqueue_bytes) {
13021                 if (non_blocking) {
13022                         /* we already checked for non-blocking above. */
13023                         max_len = sndlen;
13024                 } else {
13025                         max_len = SCTP_SB_LIMIT_SND(so) - inqueue_bytes;
13026                 }
13027         } else {
13028                 max_len = 0;
13029         }
13030         if (hold_tcblock) {
13031                 SCTP_TCB_UNLOCK(stcb);
13032                 hold_tcblock = 0;
13033         }
13034         if (asoc->strmout == NULL) {
13035                 /* huh? software error */
13036                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EFAULT);
13037                 error = EFAULT;
13038                 goto out_unlocked;
13039         }
13040
13041         /* Unless E_EOR mode is on, we must make a send FIT in one call. */
13042         if ((user_marks_eor == 0) &&
13043             (sndlen > SCTP_SB_LIMIT_SND(stcb->sctp_socket))) {
13044                 /* It will NEVER fit */
13045                 SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EMSGSIZE);
13046                 error = EMSGSIZE;
13047                 goto out_unlocked;
13048         }
13049         if ((uio == NULL) && user_marks_eor) {
13050                 /*-
13051                  * We do not support eeor mode for
13052                  * sending with mbuf chains (like sendfile).
13053                  */
13054                 SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
13055                 error = EINVAL;
13056                 goto out_unlocked;
13057         }
13058
13059         if (user_marks_eor) {
13060                 local_add_more = min(SCTP_SB_LIMIT_SND(so), SCTP_BASE_SYSCTL(sctp_add_more_threshold));
13061         } else {
13062                 /*-
13063                  * For non-eeor the whole message must fit in
13064                  * the socket send buffer.
13065                  */
13066                 local_add_more = sndlen;
13067         }
13068         len = 0;
13069         if (non_blocking) {
13070                 goto skip_preblock;
13071         }
13072         if (((max_len <= local_add_more) &&
13073             (SCTP_SB_LIMIT_SND(so) >= local_add_more)) ||
13074             (max_len == 0) ||
13075             ((stcb->asoc.chunks_on_out_queue + stcb->asoc.stream_queue_cnt) >= SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue))) {
13076                 /* No room right now ! */
13077                 SOCKBUF_LOCK(&so->so_snd);
13078                 inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * SCTP_DATA_CHUNK_OVERHEAD(stcb));
13079                 while ((SCTP_SB_LIMIT_SND(so) < (inqueue_bytes + local_add_more)) ||
13080                     ((stcb->asoc.stream_queue_cnt + stcb->asoc.chunks_on_out_queue) >= SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue))) {
13081                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "pre_block limit:%u <(inq:%d + %d) || (%d+%d > %d)\n",
13082                             (unsigned int)SCTP_SB_LIMIT_SND(so),
13083                             inqueue_bytes,
13084                             local_add_more,
13085                             stcb->asoc.stream_queue_cnt,
13086                             stcb->asoc.chunks_on_out_queue,
13087                             SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue));
13088                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13089                                 sctp_log_block(SCTP_BLOCK_LOG_INTO_BLKA, asoc, sndlen);
13090                         }
13091                         be.error = 0;
13092                         stcb->block_entry = &be;
13093                         error = sbwait(&so->so_snd);
13094                         stcb->block_entry = NULL;
13095                         if (error || so->so_error || be.error) {
13096                                 if (error == 0) {
13097                                         if (so->so_error)
13098                                                 error = so->so_error;
13099                                         if (be.error) {
13100                                                 error = be.error;
13101                                         }
13102                                 }
13103                                 SOCKBUF_UNLOCK(&so->so_snd);
13104                                 goto out_unlocked;
13105                         }
13106                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13107                                 sctp_log_block(SCTP_BLOCK_LOG_OUTOF_BLK,
13108                                     asoc, stcb->asoc.total_output_queue_size);
13109                         }
13110                         if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
13111                                 SOCKBUF_UNLOCK(&so->so_snd);
13112                                 goto out_unlocked;
13113                         }
13114                         inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * SCTP_DATA_CHUNK_OVERHEAD(stcb));
13115                 }
13116                 if (SCTP_SB_LIMIT_SND(so) > inqueue_bytes) {
13117                         max_len = SCTP_SB_LIMIT_SND(so) - inqueue_bytes;
13118                 } else {
13119                         max_len = 0;
13120                 }
13121                 SOCKBUF_UNLOCK(&so->so_snd);
13122         }
13123
13124 skip_preblock:
13125         if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
13126                 goto out_unlocked;
13127         }
13128         /*
13129          * sndlen covers for mbuf case uio_resid covers for the non-mbuf
13130          * case NOTE: uio will be null when top/mbuf is passed
13131          */
13132         if (sndlen == 0) {
13133                 if (srcv->sinfo_flags & SCTP_EOF) {
13134                         got_all_of_the_send = 1;
13135                         goto dataless_eof;
13136                 } else {
13137                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
13138                         error = EINVAL;
13139                         goto out;
13140                 }
13141         }
13142         if (top == NULL) {
13143                 struct sctp_stream_queue_pending *sp;
13144                 struct sctp_stream_out *strm;
13145                 uint32_t sndout;
13146
13147                 SCTP_TCB_SEND_LOCK(stcb);
13148                 if ((asoc->stream_locked) &&
13149                     (asoc->stream_locked_on != srcv->sinfo_stream)) {
13150                         SCTP_TCB_SEND_UNLOCK(stcb);
13151                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
13152                         error = EINVAL;
13153                         goto out;
13154                 }
13155                 SCTP_TCB_SEND_UNLOCK(stcb);
13156
13157                 strm = &stcb->asoc.strmout[srcv->sinfo_stream];
13158                 if (strm->last_msg_incomplete == 0) {
13159         do_a_copy_in:
13160                         sp = sctp_copy_it_in(stcb, asoc, srcv, uio, net, max_len, user_marks_eor, &error);
13161                         if (error) {
13162                                 goto out;
13163                         }
13164                         SCTP_TCB_SEND_LOCK(stcb);
13165                         if (sp->msg_is_complete) {
13166                                 strm->last_msg_incomplete = 0;
13167                                 asoc->stream_locked = 0;
13168                         } else {
13169                                 /*
13170                                  * Just got locked to this guy in case of an
13171                                  * interrupt.
13172                                  */
13173                                 strm->last_msg_incomplete = 1;
13174                                 if (stcb->asoc.idata_supported == 0) {
13175                                         asoc->stream_locked = 1;
13176                                         asoc->stream_locked_on = srcv->sinfo_stream;
13177                                 }
13178                                 sp->sender_all_done = 0;
13179                         }
13180                         sctp_snd_sb_alloc(stcb, sp->length);
13181                         atomic_add_int(&asoc->stream_queue_cnt, 1);
13182                         if (srcv->sinfo_flags & SCTP_UNORDERED) {
13183                                 SCTP_STAT_INCR(sctps_sends_with_unord);
13184                         }
13185                         TAILQ_INSERT_TAIL(&strm->outqueue, sp, next);
13186                         stcb->asoc.ss_functions.sctp_ss_add_to_stream(stcb, asoc, strm, sp, 1);
13187                         SCTP_TCB_SEND_UNLOCK(stcb);
13188                 } else {
13189                         SCTP_TCB_SEND_LOCK(stcb);
13190                         sp = TAILQ_LAST(&strm->outqueue, sctp_streamhead);
13191                         SCTP_TCB_SEND_UNLOCK(stcb);
13192                         if (sp == NULL) {
13193                                 /* ???? Huh ??? last msg is gone */
13194 #ifdef INVARIANTS
13195                                 panic("Warning: Last msg marked incomplete, yet nothing left?");
13196 #else
13197                                 SCTP_PRINTF("Warning: Last msg marked incomplete, yet nothing left?\n");
13198                                 strm->last_msg_incomplete = 0;
13199 #endif
13200                                 goto do_a_copy_in;
13201
13202                         }
13203                 }
13204                 while (uio->uio_resid > 0) {
13205                         /* How much room do we have? */
13206                         struct mbuf *new_tail, *mm;
13207
13208                         inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * SCTP_DATA_CHUNK_OVERHEAD(stcb));
13209                         if (SCTP_SB_LIMIT_SND(so) > inqueue_bytes)
13210                                 max_len = SCTP_SB_LIMIT_SND(so) - inqueue_bytes;
13211                         else
13212                                 max_len = 0;
13213
13214                         if ((max_len > SCTP_BASE_SYSCTL(sctp_add_more_threshold)) ||
13215                             (max_len && (SCTP_SB_LIMIT_SND(so) < SCTP_BASE_SYSCTL(sctp_add_more_threshold))) ||
13216                             (uio->uio_resid && (uio->uio_resid <= (int)max_len))) {
13217                                 sndout = 0;
13218                                 new_tail = NULL;
13219                                 if (hold_tcblock) {
13220                                         SCTP_TCB_UNLOCK(stcb);
13221                                         hold_tcblock = 0;
13222                                 }
13223                                 mm = sctp_copy_resume(uio, max_len, user_marks_eor, &error, &sndout, &new_tail);
13224                                 if ((mm == NULL) || error) {
13225                                         if (mm) {
13226                                                 sctp_m_freem(mm);
13227                                         }
13228                                         goto out;
13229                                 }
13230                                 /* Update the mbuf and count */
13231                                 SCTP_TCB_SEND_LOCK(stcb);
13232                                 if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
13233                                         /*
13234                                          * we need to get out. Peer probably
13235                                          * aborted.
13236                                          */
13237                                         sctp_m_freem(mm);
13238                                         if (stcb->asoc.state & SCTP_PCB_FLAGS_WAS_ABORTED) {
13239                                                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
13240                                                 error = ECONNRESET;
13241                                         }
13242                                         SCTP_TCB_SEND_UNLOCK(stcb);
13243                                         goto out;
13244                                 }
13245                                 if (sp->tail_mbuf) {
13246                                         /* tack it to the end */
13247                                         SCTP_BUF_NEXT(sp->tail_mbuf) = mm;
13248                                         sp->tail_mbuf = new_tail;
13249                                 } else {
13250                                         /* A stolen mbuf */
13251                                         sp->data = mm;
13252                                         sp->tail_mbuf = new_tail;
13253                                 }
13254                                 sctp_snd_sb_alloc(stcb, sndout);
13255                                 atomic_add_int(&sp->length, sndout);
13256                                 len += sndout;
13257                                 if (srcv->sinfo_flags & SCTP_SACK_IMMEDIATELY) {
13258                                         sp->sinfo_flags |= SCTP_SACK_IMMEDIATELY;
13259                                 }
13260
13261                                 /* Did we reach EOR? */
13262                                 if ((uio->uio_resid == 0) &&
13263                                     ((user_marks_eor == 0) ||
13264                                     (srcv->sinfo_flags & SCTP_EOF) ||
13265                                     (user_marks_eor && (srcv->sinfo_flags & SCTP_EOR)))) {
13266                                         sp->msg_is_complete = 1;
13267                                 } else {
13268                                         sp->msg_is_complete = 0;
13269                                 }
13270                                 SCTP_TCB_SEND_UNLOCK(stcb);
13271                         }
13272                         if (uio->uio_resid == 0) {
13273                                 /* got it all? */
13274                                 continue;
13275                         }
13276                         /* PR-SCTP? */
13277                         if ((asoc->prsctp_supported) && (asoc->sent_queue_cnt_removeable > 0)) {
13278                                 /*
13279                                  * This is ugly but we must assure locking
13280                                  * order
13281                                  */
13282                                 if (hold_tcblock == 0) {
13283                                         SCTP_TCB_LOCK(stcb);
13284                                         hold_tcblock = 1;
13285                                 }
13286                                 sctp_prune_prsctp(stcb, asoc, srcv, sndlen);
13287                                 inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * SCTP_DATA_CHUNK_OVERHEAD(stcb));
13288                                 if (SCTP_SB_LIMIT_SND(so) > inqueue_bytes)
13289                                         max_len = SCTP_SB_LIMIT_SND(so) - inqueue_bytes;
13290                                 else
13291                                         max_len = 0;
13292                                 if (max_len > 0) {
13293                                         continue;
13294                                 }
13295                                 SCTP_TCB_UNLOCK(stcb);
13296                                 hold_tcblock = 0;
13297                         }
13298                         /* wait for space now */
13299                         if (non_blocking) {
13300                                 /* Non-blocking io in place out */
13301                                 goto skip_out_eof;
13302                         }
13303                         /* What about the INIT, send it maybe */
13304                         if (queue_only_for_init) {
13305                                 if (hold_tcblock == 0) {
13306                                         SCTP_TCB_LOCK(stcb);
13307                                         hold_tcblock = 1;
13308                                 }
13309                                 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_OPEN) {
13310                                         /* a collision took us forward? */
13311                                         queue_only = 0;
13312                                 } else {
13313                                         sctp_send_initiate(inp, stcb, SCTP_SO_LOCKED);
13314                                         SCTP_SET_STATE(asoc, SCTP_STATE_COOKIE_WAIT);
13315                                         queue_only = 1;
13316                                 }
13317                         }
13318                         if ((net->flight_size > net->cwnd) &&
13319                             (asoc->sctp_cmt_on_off == 0)) {
13320                                 SCTP_STAT_INCR(sctps_send_cwnd_avoid);
13321                                 queue_only = 1;
13322                         } else if (asoc->ifp_had_enobuf) {
13323                                 SCTP_STAT_INCR(sctps_ifnomemqueued);
13324                                 if (net->flight_size > (2 * net->mtu)) {
13325                                         queue_only = 1;
13326                                 }
13327                                 asoc->ifp_had_enobuf = 0;
13328                         }
13329                         un_sent = stcb->asoc.total_output_queue_size - stcb->asoc.total_flight;
13330                         if ((sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY)) &&
13331                             (stcb->asoc.total_flight > 0) &&
13332                             (stcb->asoc.stream_queue_cnt < SCTP_MAX_DATA_BUNDLING) &&
13333                             (un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD))) {
13334
13335                                 /*-
13336                                  * Ok, Nagle is set on and we have data outstanding.
13337                                  * Don't send anything and let SACKs drive out the
13338                                  * data unless we have a "full" segment to send.
13339                                  */
13340                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
13341                                         sctp_log_nagle_event(stcb, SCTP_NAGLE_APPLIED);
13342                                 }
13343                                 SCTP_STAT_INCR(sctps_naglequeued);
13344                                 nagle_applies = 1;
13345                         } else {
13346                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
13347                                         if (sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY))
13348                                                 sctp_log_nagle_event(stcb, SCTP_NAGLE_SKIPPED);
13349                                 }
13350                                 SCTP_STAT_INCR(sctps_naglesent);
13351                                 nagle_applies = 0;
13352                         }
13353                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13354
13355                                 sctp_misc_ints(SCTP_CWNDLOG_PRESEND, queue_only_for_init, queue_only,
13356                                     nagle_applies, un_sent);
13357                                 sctp_misc_ints(SCTP_CWNDLOG_PRESEND, stcb->asoc.total_output_queue_size,
13358                                     stcb->asoc.total_flight,
13359                                     stcb->asoc.chunks_on_out_queue, stcb->asoc.total_flight_count);
13360                         }
13361                         if (queue_only_for_init)
13362                                 queue_only_for_init = 0;
13363                         if ((queue_only == 0) && (nagle_applies == 0)) {
13364                                 /*-
13365                                  * need to start chunk output
13366                                  * before blocking.. note that if
13367                                  * a lock is already applied, then
13368                                  * the input via the net is happening
13369                                  * and I don't need to start output :-D
13370                                  */
13371                                 if (hold_tcblock == 0) {
13372                                         if (SCTP_TCB_TRYLOCK(stcb)) {
13373                                                 hold_tcblock = 1;
13374                                                 sctp_chunk_output(inp,
13375                                                     stcb,
13376                                                     SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13377                                         }
13378                                 } else {
13379                                         sctp_chunk_output(inp,
13380                                             stcb,
13381                                             SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13382                                 }
13383                                 if (hold_tcblock == 1) {
13384                                         SCTP_TCB_UNLOCK(stcb);
13385                                         hold_tcblock = 0;
13386                                 }
13387                         }
13388                         SOCKBUF_LOCK(&so->so_snd);
13389                         /*-
13390                          * This is a bit strange, but I think it will
13391                          * work. The total_output_queue_size is locked and
13392                          * protected by the TCB_LOCK, which we just released.
13393                          * There is a race that can occur between releasing it
13394                          * above, and me getting the socket lock, where sacks
13395                          * come in but we have not put the SB_WAIT on the
13396                          * so_snd buffer to get the wakeup. After the LOCK
13397                          * is applied the sack_processing will also need to
13398                          * LOCK the so->so_snd to do the actual sowwakeup(). So
13399                          * once we have the socket buffer lock if we recheck the
13400                          * size we KNOW we will get to sleep safely with the
13401                          * wakeup flag in place.
13402                          */
13403                         inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * SCTP_DATA_CHUNK_OVERHEAD(stcb));
13404                         if (SCTP_SB_LIMIT_SND(so) <= (inqueue_bytes +
13405                             min(SCTP_BASE_SYSCTL(sctp_add_more_threshold), SCTP_SB_LIMIT_SND(so)))) {
13406                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13407                                         sctp_log_block(SCTP_BLOCK_LOG_INTO_BLK,
13408                                             asoc, (size_t)uio->uio_resid);
13409                                 }
13410                                 be.error = 0;
13411                                 stcb->block_entry = &be;
13412                                 error = sbwait(&so->so_snd);
13413                                 stcb->block_entry = NULL;
13414
13415                                 if (error || so->so_error || be.error) {
13416                                         if (error == 0) {
13417                                                 if (so->so_error)
13418                                                         error = so->so_error;
13419                                                 if (be.error) {
13420                                                         error = be.error;
13421                                                 }
13422                                         }
13423                                         SOCKBUF_UNLOCK(&so->so_snd);
13424                                         goto out_unlocked;
13425                                 }
13426
13427                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13428                                         sctp_log_block(SCTP_BLOCK_LOG_OUTOF_BLK,
13429                                             asoc, stcb->asoc.total_output_queue_size);
13430                                 }
13431                         }
13432                         SOCKBUF_UNLOCK(&so->so_snd);
13433                         if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
13434                                 goto out_unlocked;
13435                         }
13436                 }
13437                 SCTP_TCB_SEND_LOCK(stcb);
13438                 if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
13439                         SCTP_TCB_SEND_UNLOCK(stcb);
13440                         goto out_unlocked;
13441                 }
13442                 if (sp) {
13443                         if (sp->msg_is_complete == 0) {
13444                                 strm->last_msg_incomplete = 1;
13445                                 if (stcb->asoc.idata_supported == 0) {
13446                                         asoc->stream_locked = 1;
13447                                         asoc->stream_locked_on = srcv->sinfo_stream;
13448                                 }
13449                         } else {
13450                                 sp->sender_all_done = 1;
13451                                 strm->last_msg_incomplete = 0;
13452                                 asoc->stream_locked = 0;
13453                         }
13454                 } else {
13455                         SCTP_PRINTF("Huh no sp TSNH?\n");
13456                         strm->last_msg_incomplete = 0;
13457                         asoc->stream_locked = 0;
13458                 }
13459                 SCTP_TCB_SEND_UNLOCK(stcb);
13460                 if (uio->uio_resid == 0) {
13461                         got_all_of_the_send = 1;
13462                 }
13463         } else {
13464                 /* We send in a 0, since we do NOT have any locks */
13465                 error = sctp_msg_append(stcb, net, top, srcv, 0);
13466                 top = NULL;
13467                 if (srcv->sinfo_flags & SCTP_EOF) {
13468                         /*
13469                          * This should only happen for Panda for the mbuf
13470                          * send case, which does NOT yet support EEOR mode.
13471                          * Thus, we can just set this flag to do the proper
13472                          * EOF handling.
13473                          */
13474                         got_all_of_the_send = 1;
13475                 }
13476         }
13477         if (error) {
13478                 goto out;
13479         }
13480 dataless_eof:
13481         /* EOF thing ? */
13482         if ((srcv->sinfo_flags & SCTP_EOF) &&
13483             (got_all_of_the_send == 1)) {
13484                 SCTP_STAT_INCR(sctps_sends_with_eof);
13485                 error = 0;
13486                 if (hold_tcblock == 0) {
13487                         SCTP_TCB_LOCK(stcb);
13488                         hold_tcblock = 1;
13489                 }
13490                 if (TAILQ_EMPTY(&asoc->send_queue) &&
13491                     TAILQ_EMPTY(&asoc->sent_queue) &&
13492                     sctp_is_there_unsent_data(stcb, SCTP_SO_LOCKED) == 0) {
13493                         if ((*asoc->ss_functions.sctp_ss_is_user_msgs_incomplete) (stcb, asoc)) {
13494                                 goto abort_anyway;
13495                         }
13496                         /* there is nothing queued to send, so I'm done... */
13497                         if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) &&
13498                             (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
13499                             (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
13500                                 struct sctp_nets *netp;
13501
13502                                 /* only send SHUTDOWN the first time through */
13503                                 if (SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) {
13504                                         SCTP_STAT_DECR_GAUGE32(sctps_currestab);
13505                                 }
13506                                 SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_SENT);
13507                                 SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING);
13508                                 sctp_stop_timers_for_shutdown(stcb);
13509                                 if (stcb->asoc.alternate) {
13510                                         netp = stcb->asoc.alternate;
13511                                 } else {
13512                                         netp = stcb->asoc.primary_destination;
13513                                 }
13514                                 sctp_send_shutdown(stcb, netp);
13515                                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb,
13516                                     netp);
13517                                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
13518                                     asoc->primary_destination);
13519                         }
13520                 } else {
13521                         /*-
13522                          * we still got (or just got) data to send, so set
13523                          * SHUTDOWN_PENDING
13524                          */
13525                         /*-
13526                          * XXX sockets draft says that SCTP_EOF should be
13527                          * sent with no data.  currently, we will allow user
13528                          * data to be sent first and move to
13529                          * SHUTDOWN-PENDING
13530                          */
13531                         if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) &&
13532                             (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
13533                             (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
13534                                 if (hold_tcblock == 0) {
13535                                         SCTP_TCB_LOCK(stcb);
13536                                         hold_tcblock = 1;
13537                                 }
13538                                 if ((*asoc->ss_functions.sctp_ss_is_user_msgs_incomplete) (stcb, asoc)) {
13539                                         asoc->state |= SCTP_STATE_PARTIAL_MSG_LEFT;
13540                                 }
13541                                 asoc->state |= SCTP_STATE_SHUTDOWN_PENDING;
13542                                 if (TAILQ_EMPTY(&asoc->send_queue) &&
13543                                     TAILQ_EMPTY(&asoc->sent_queue) &&
13544                                     (asoc->state & SCTP_STATE_PARTIAL_MSG_LEFT)) {
13545                                         struct mbuf *op_err;
13546                                         char msg[SCTP_DIAG_INFO_LEN];
13547
13548                         abort_anyway:
13549                                         if (free_cnt_applied) {
13550                                                 atomic_add_int(&stcb->asoc.refcnt, -1);
13551                                                 free_cnt_applied = 0;
13552                                         }
13553                                         snprintf(msg, sizeof(msg),
13554                                             "%s:%d at %s", __FILE__, __LINE__, __func__);
13555                                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
13556                                             msg);
13557                                         sctp_abort_an_association(stcb->sctp_ep, stcb,
13558                                             op_err, SCTP_SO_LOCKED);
13559                                         /*
13560                                          * now relock the stcb so everything
13561                                          * is sane
13562                                          */
13563                                         hold_tcblock = 0;
13564                                         stcb = NULL;
13565                                         goto out;
13566                                 }
13567                                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
13568                                     asoc->primary_destination);
13569                                 sctp_feature_off(inp, SCTP_PCB_FLAGS_NODELAY);
13570                         }
13571                 }
13572         }
13573 skip_out_eof:
13574         if (!TAILQ_EMPTY(&stcb->asoc.control_send_queue)) {
13575                 some_on_control = 1;
13576         }
13577         if (queue_only_for_init) {
13578                 if (hold_tcblock == 0) {
13579                         SCTP_TCB_LOCK(stcb);
13580                         hold_tcblock = 1;
13581                 }
13582                 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_OPEN) {
13583                         /* a collision took us forward? */
13584                         queue_only = 0;
13585                 } else {
13586                         sctp_send_initiate(inp, stcb, SCTP_SO_LOCKED);
13587                         SCTP_SET_STATE(&stcb->asoc, SCTP_STATE_COOKIE_WAIT);
13588                         queue_only = 1;
13589                 }
13590         }
13591         if ((net->flight_size > net->cwnd) &&
13592             (stcb->asoc.sctp_cmt_on_off == 0)) {
13593                 SCTP_STAT_INCR(sctps_send_cwnd_avoid);
13594                 queue_only = 1;
13595         } else if (asoc->ifp_had_enobuf) {
13596                 SCTP_STAT_INCR(sctps_ifnomemqueued);
13597                 if (net->flight_size > (2 * net->mtu)) {
13598                         queue_only = 1;
13599                 }
13600                 asoc->ifp_had_enobuf = 0;
13601         }
13602         un_sent = stcb->asoc.total_output_queue_size - stcb->asoc.total_flight;
13603         if ((sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY)) &&
13604             (stcb->asoc.total_flight > 0) &&
13605             (stcb->asoc.stream_queue_cnt < SCTP_MAX_DATA_BUNDLING) &&
13606             (un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD))) {
13607                 /*-
13608                  * Ok, Nagle is set on and we have data outstanding.
13609                  * Don't send anything and let SACKs drive out the
13610                  * data unless wen have a "full" segment to send.
13611                  */
13612                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
13613                         sctp_log_nagle_event(stcb, SCTP_NAGLE_APPLIED);
13614                 }
13615                 SCTP_STAT_INCR(sctps_naglequeued);
13616                 nagle_applies = 1;
13617         } else {
13618                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
13619                         if (sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY))
13620                                 sctp_log_nagle_event(stcb, SCTP_NAGLE_SKIPPED);
13621                 }
13622                 SCTP_STAT_INCR(sctps_naglesent);
13623                 nagle_applies = 0;
13624         }
13625         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13626                 sctp_misc_ints(SCTP_CWNDLOG_PRESEND, queue_only_for_init, queue_only,
13627                     nagle_applies, un_sent);
13628                 sctp_misc_ints(SCTP_CWNDLOG_PRESEND, stcb->asoc.total_output_queue_size,
13629                     stcb->asoc.total_flight,
13630                     stcb->asoc.chunks_on_out_queue, stcb->asoc.total_flight_count);
13631         }
13632         if ((queue_only == 0) && (nagle_applies == 0) && (stcb->asoc.peers_rwnd && un_sent)) {
13633                 /* we can attempt to send too. */
13634                 if (hold_tcblock == 0) {
13635                         /*
13636                          * If there is activity recv'ing sacks no need to
13637                          * send
13638                          */
13639                         if (SCTP_TCB_TRYLOCK(stcb)) {
13640                                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13641                                 hold_tcblock = 1;
13642                         }
13643                 } else {
13644                         sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13645                 }
13646         } else if ((queue_only == 0) &&
13647                     (stcb->asoc.peers_rwnd == 0) &&
13648             (stcb->asoc.total_flight == 0)) {
13649                 /* We get to have a probe outstanding */
13650                 if (hold_tcblock == 0) {
13651                         hold_tcblock = 1;
13652                         SCTP_TCB_LOCK(stcb);
13653                 }
13654                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13655         } else if (some_on_control) {
13656                 int num_out, reason, frag_point;
13657
13658                 /* Here we do control only */
13659                 if (hold_tcblock == 0) {
13660                         hold_tcblock = 1;
13661                         SCTP_TCB_LOCK(stcb);
13662                 }
13663                 frag_point = sctp_get_frag_point(stcb, &stcb->asoc);
13664                 (void)sctp_med_chunk_output(inp, stcb, &stcb->asoc, &num_out,
13665                     &reason, 1, 1, &now, &now_filled, frag_point, SCTP_SO_LOCKED);
13666         }
13667         SCTPDBG(SCTP_DEBUG_OUTPUT1, "USR Send complete qo:%d prw:%d unsent:%d tf:%d cooq:%d toqs:%d err:%d\n",
13668             queue_only, stcb->asoc.peers_rwnd, un_sent,
13669             stcb->asoc.total_flight, stcb->asoc.chunks_on_out_queue,
13670             stcb->asoc.total_output_queue_size, error);
13671
13672 out:
13673 out_unlocked:
13674
13675         if (local_soresv && stcb) {
13676                 atomic_subtract_int(&stcb->asoc.sb_send_resv, sndlen);
13677         }
13678         if (create_lock_applied) {
13679                 SCTP_ASOC_CREATE_UNLOCK(inp);
13680         }
13681         if ((stcb) && hold_tcblock) {
13682                 SCTP_TCB_UNLOCK(stcb);
13683         }
13684         if (stcb && free_cnt_applied) {
13685                 atomic_add_int(&stcb->asoc.refcnt, -1);
13686         }
13687 #ifdef INVARIANTS
13688         if (stcb) {
13689                 if (mtx_owned(&stcb->tcb_mtx)) {
13690                         panic("Leaving with tcb mtx owned?");
13691                 }
13692                 if (mtx_owned(&stcb->tcb_send_mtx)) {
13693                         panic("Leaving with tcb send mtx owned?");
13694                 }
13695         }
13696 #endif
13697         if (top) {
13698                 sctp_m_freem(top);
13699         }
13700         if (control) {
13701                 sctp_m_freem(control);
13702         }
13703         return (error);
13704 }
13705
13706
13707 /*
13708  * generate an AUTHentication chunk, if required
13709  */
13710 struct mbuf *
13711 sctp_add_auth_chunk(struct mbuf *m, struct mbuf **m_end,
13712     struct sctp_auth_chunk **auth_ret, uint32_t * offset,
13713     struct sctp_tcb *stcb, uint8_t chunk)
13714 {
13715         struct mbuf *m_auth;
13716         struct sctp_auth_chunk *auth;
13717         int chunk_len;
13718         struct mbuf *cn;
13719
13720         if ((m_end == NULL) || (auth_ret == NULL) || (offset == NULL) ||
13721             (stcb == NULL))
13722                 return (m);
13723
13724         if (stcb->asoc.auth_supported == 0) {
13725                 return (m);
13726         }
13727         /* does the requested chunk require auth? */
13728         if (!sctp_auth_is_required_chunk(chunk, stcb->asoc.peer_auth_chunks)) {
13729                 return (m);
13730         }
13731         m_auth = sctp_get_mbuf_for_msg(sizeof(*auth), 0, M_NOWAIT, 1, MT_HEADER);
13732         if (m_auth == NULL) {
13733                 /* no mbuf's */
13734                 return (m);
13735         }
13736         /* reserve some space if this will be the first mbuf */
13737         if (m == NULL)
13738                 SCTP_BUF_RESV_UF(m_auth, SCTP_MIN_OVERHEAD);
13739         /* fill in the AUTH chunk details */
13740         auth = mtod(m_auth, struct sctp_auth_chunk *);
13741         memset(auth, 0, sizeof(*auth));
13742         auth->ch.chunk_type = SCTP_AUTHENTICATION;
13743         auth->ch.chunk_flags = 0;
13744         chunk_len = sizeof(*auth) +
13745             sctp_get_hmac_digest_len(stcb->asoc.peer_hmac_id);
13746         auth->ch.chunk_length = htons(chunk_len);
13747         auth->hmac_id = htons(stcb->asoc.peer_hmac_id);
13748         /* key id and hmac digest will be computed and filled in upon send */
13749
13750         /* save the offset where the auth was inserted into the chain */
13751         *offset = 0;
13752         for (cn = m; cn; cn = SCTP_BUF_NEXT(cn)) {
13753                 *offset += SCTP_BUF_LEN(cn);
13754         }
13755
13756         /* update length and return pointer to the auth chunk */
13757         SCTP_BUF_LEN(m_auth) = chunk_len;
13758         m = sctp_copy_mbufchain(m_auth, m, m_end, 1, chunk_len, 0);
13759         if (auth_ret != NULL)
13760                 *auth_ret = auth;
13761
13762         return (m);
13763 }
13764
13765 #ifdef INET6
13766 int
13767 sctp_v6src_match_nexthop(struct sockaddr_in6 *src6, sctp_route_t * ro)
13768 {
13769         struct nd_prefix *pfx = NULL;
13770         struct nd_pfxrouter *pfxrtr = NULL;
13771         struct sockaddr_in6 gw6;
13772
13773         if (ro == NULL || ro->ro_rt == NULL || src6->sin6_family != AF_INET6)
13774                 return (0);
13775
13776         /* get prefix entry of address */
13777         ND6_RLOCK();
13778         LIST_FOREACH(pfx, &MODULE_GLOBAL(nd_prefix), ndpr_entry) {
13779                 if (pfx->ndpr_stateflags & NDPRF_DETACHED)
13780                         continue;
13781                 if (IN6_ARE_MASKED_ADDR_EQUAL(&pfx->ndpr_prefix.sin6_addr,
13782                     &src6->sin6_addr, &pfx->ndpr_mask))
13783                         break;
13784         }
13785         /* no prefix entry in the prefix list */
13786         if (pfx == NULL) {
13787                 ND6_RUNLOCK();
13788                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "No prefix entry for ");
13789                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)src6);
13790                 return (0);
13791         }
13792
13793         SCTPDBG(SCTP_DEBUG_OUTPUT2, "v6src_match_nexthop(), Prefix entry is ");
13794         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)src6);
13795
13796         /* search installed gateway from prefix entry */
13797         LIST_FOREACH(pfxrtr, &pfx->ndpr_advrtrs, pfr_entry) {
13798                 memset(&gw6, 0, sizeof(struct sockaddr_in6));
13799                 gw6.sin6_family = AF_INET6;
13800                 gw6.sin6_len = sizeof(struct sockaddr_in6);
13801                 memcpy(&gw6.sin6_addr, &pfxrtr->router->rtaddr,
13802                     sizeof(struct in6_addr));
13803                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "prefix router is ");
13804                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)&gw6);
13805                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "installed router is ");
13806                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, ro->ro_rt->rt_gateway);
13807                 if (sctp_cmpaddr((struct sockaddr *)&gw6, ro->ro_rt->rt_gateway)) {
13808                         ND6_RUNLOCK();
13809                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "pfxrouter is installed\n");
13810                         return (1);
13811                 }
13812         }
13813         ND6_RUNLOCK();
13814         SCTPDBG(SCTP_DEBUG_OUTPUT2, "pfxrouter is not installed\n");
13815         return (0);
13816 }
13817 #endif
13818
13819 int
13820 sctp_v4src_match_nexthop(struct sctp_ifa *sifa, sctp_route_t * ro)
13821 {
13822 #ifdef INET
13823         struct sockaddr_in *sin, *mask;
13824         struct ifaddr *ifa;
13825         struct in_addr srcnetaddr, gwnetaddr;
13826
13827         if (ro == NULL || ro->ro_rt == NULL ||
13828             sifa->address.sa.sa_family != AF_INET) {
13829                 return (0);
13830         }
13831         ifa = (struct ifaddr *)sifa->ifa;
13832         mask = (struct sockaddr_in *)(ifa->ifa_netmask);
13833         sin = &sifa->address.sin;
13834         srcnetaddr.s_addr = (sin->sin_addr.s_addr & mask->sin_addr.s_addr);
13835         SCTPDBG(SCTP_DEBUG_OUTPUT1, "match_nexthop4: src address is ");
13836         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, &sifa->address.sa);
13837         SCTPDBG(SCTP_DEBUG_OUTPUT1, "network address is %x\n", srcnetaddr.s_addr);
13838
13839         sin = (struct sockaddr_in *)ro->ro_rt->rt_gateway;
13840         gwnetaddr.s_addr = (sin->sin_addr.s_addr & mask->sin_addr.s_addr);
13841         SCTPDBG(SCTP_DEBUG_OUTPUT1, "match_nexthop4: nexthop is ");
13842         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, ro->ro_rt->rt_gateway);
13843         SCTPDBG(SCTP_DEBUG_OUTPUT1, "network address is %x\n", gwnetaddr.s_addr);
13844         if (srcnetaddr.s_addr == gwnetaddr.s_addr) {
13845                 return (1);
13846         }
13847 #endif
13848         return (0);
13849 }