sys/netinet/sctp_output.c

   1 /*-
   2  * SPDX-License-Identifier: BSD-3-Clause
   3  *
   4  * Copyright (c) 2001-2008, by Cisco Systems, Inc. All rights reserved.
   5  * Copyright (c) 2008-2012, by Randall Stewart. All rights reserved.
   6  * Copyright (c) 2008-2012, by Michael Tuexen. All rights reserved.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions are met:
  10  *
  11  * a) Redistributions of source code must retain the above copyright notice,
  12  *    this list of conditions and the following disclaimer.
  13  *
  14  * b) Redistributions in binary form must reproduce the above copyright
  15  *    notice, this list of conditions and the following disclaimer in
  16  *    the documentation and/or other materials provided with the distribution.
  17  *
  18  * c) Neither the name of Cisco Systems, Inc. nor the names of its
  19  *    contributors may be used to endorse or promote products derived
  20  *    from this software without specific prior written permission.
  21  *
  22  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  23  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
  24  * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  25  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
  26  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  27  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  28  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  29  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  30  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  31  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
  32  * THE POSSIBILITY OF SUCH DAMAGE.
  33  */
  34
  35 #include <sys/cdefs.h>
  36 __FBSDID("$FreeBSD$");
  37
  38 #include <netinet/sctp_os.h>
  39 #include <sys/proc.h>
  40 #include <netinet/sctp_var.h>
  41 #include <netinet/sctp_sysctl.h>
  42 #include <netinet/sctp_header.h>
  43 #include <netinet/sctp_pcb.h>
  44 #include <netinet/sctputil.h>
  45 #include <netinet/sctp_output.h>
  46 #include <netinet/sctp_uio.h>
  47 #include <netinet/sctputil.h>
  48 #include <netinet/sctp_auth.h>
  49 #include <netinet/sctp_timer.h>
  50 #include <netinet/sctp_asconf.h>
  51 #include <netinet/sctp_indata.h>
  52 #include <netinet/sctp_bsd_addr.h>
  53 #include <netinet/sctp_input.h>
  54 #include <netinet/sctp_crc32.h>
  55 #include <netinet/sctp_kdtrace.h>
  56 #if defined(INET) || defined(INET6)
  57 #include <netinet/udp.h>
  58 #endif
  59 #include <netinet/udp_var.h>
  60 #include <machine/in_cksum.h>
  61
  62
  63 #define SCTP_MAX_GAPS_INARRAY 4
  64 struct sack_track {
  65         uint8_t right_edge;     /* mergable on the right edge */
  66         uint8_t left_edge;      /* mergable on the left edge */
  67         uint8_t num_entries;
  68         uint8_t spare;
  69         struct sctp_gap_ack_block gaps[SCTP_MAX_GAPS_INARRAY];
  70 };
  71
  72 const struct sack_track sack_array[256] = {
  73         {0, 0, 0, 0,            /* 0x00 */
  74                 {{0, 0},
  75                 {0, 0},
  76                 {0, 0},
  77                 {0, 0}
  78                 }
  79         },
  80         {1, 0, 1, 0,            /* 0x01 */
  81                 {{0, 0},
  82                 {0, 0},
  83                 {0, 0},
  84                 {0, 0}
  85                 }
  86         },
  87         {0, 0, 1, 0,            /* 0x02 */
  88                 {{1, 1},
  89                 {0, 0},
  90                 {0, 0},
  91                 {0, 0}
  92                 }
  93         },
  94         {1, 0, 1, 0,            /* 0x03 */
  95                 {{0, 1},
  96                 {0, 0},
  97                 {0, 0},
  98                 {0, 0}
  99                 }
 100         },
 101         {0, 0, 1, 0,            /* 0x04 */
 102                 {{2, 2},
 103                 {0, 0},
 104                 {0, 0},
 105                 {0, 0}
 106                 }
 107         },
 108         {1, 0, 2, 0,            /* 0x05 */
 109                 {{0, 0},
 110                 {2, 2},
 111                 {0, 0},
 112                 {0, 0}
 113                 }
 114         },
 115         {0, 0, 1, 0,            /* 0x06 */
 116                 {{1, 2},
 117                 {0, 0},
 118                 {0, 0},
 119                 {0, 0}
 120                 }
 121         },
 122         {1, 0, 1, 0,            /* 0x07 */
 123                 {{0, 2},
 124                 {0, 0},
 125                 {0, 0},
 126                 {0, 0}
 127                 }
 128         },
 129         {0, 0, 1, 0,            /* 0x08 */
 130                 {{3, 3},
 131                 {0, 0},
 132                 {0, 0},
 133                 {0, 0}
 134                 }
 135         },
 136         {1, 0, 2, 0,            /* 0x09 */
 137                 {{0, 0},
 138                 {3, 3},
 139                 {0, 0},
 140                 {0, 0}
 141                 }
 142         },
 143         {0, 0, 2, 0,            /* 0x0a */
 144                 {{1, 1},
 145                 {3, 3},
 146                 {0, 0},
 147                 {0, 0}
 148                 }
 149         },
 150         {1, 0, 2, 0,            /* 0x0b */
 151                 {{0, 1},
 152                 {3, 3},
 153                 {0, 0},
 154                 {0, 0}
 155                 }
 156         },
 157         {0, 0, 1, 0,            /* 0x0c */
 158                 {{2, 3},
 159                 {0, 0},
 160                 {0, 0},
 161                 {0, 0}
 162                 }
 163         },
 164         {1, 0, 2, 0,            /* 0x0d */
 165                 {{0, 0},
 166                 {2, 3},
 167                 {0, 0},
 168                 {0, 0}
 169                 }
 170         },
 171         {0, 0, 1, 0,            /* 0x0e */
 172                 {{1, 3},
 173                 {0, 0},
 174                 {0, 0},
 175                 {0, 0}
 176                 }
 177         },
 178         {1, 0, 1, 0,            /* 0x0f */
 179                 {{0, 3},
 180                 {0, 0},
 181                 {0, 0},
 182                 {0, 0}
 183                 }
 184         },
 185         {0, 0, 1, 0,            /* 0x10 */
 186                 {{4, 4},
 187                 {0, 0},
 188                 {0, 0},
 189                 {0, 0}
 190                 }
 191         },
 192         {1, 0, 2, 0,            /* 0x11 */
 193                 {{0, 0},
 194                 {4, 4},
 195                 {0, 0},
 196                 {0, 0}
 197                 }
 198         },
 199         {0, 0, 2, 0,            /* 0x12 */
 200                 {{1, 1},
 201                 {4, 4},
 202                 {0, 0},
 203                 {0, 0}
 204                 }
 205         },
 206         {1, 0, 2, 0,            /* 0x13 */
 207                 {{0, 1},
 208                 {4, 4},
 209                 {0, 0},
 210                 {0, 0}
 211                 }
 212         },
 213         {0, 0, 2, 0,            /* 0x14 */
 214                 {{2, 2},
 215                 {4, 4},
 216                 {0, 0},
 217                 {0, 0}
 218                 }
 219         },
 220         {1, 0, 3, 0,            /* 0x15 */
 221                 {{0, 0},
 222                 {2, 2},
 223                 {4, 4},
 224                 {0, 0}
 225                 }
 226         },
 227         {0, 0, 2, 0,            /* 0x16 */
 228                 {{1, 2},
 229                 {4, 4},
 230                 {0, 0},
 231                 {0, 0}
 232                 }
 233         },
 234         {1, 0, 2, 0,            /* 0x17 */
 235                 {{0, 2},
 236                 {4, 4},
 237                 {0, 0},
 238                 {0, 0}
 239                 }
 240         },
 241         {0, 0, 1, 0,            /* 0x18 */
 242                 {{3, 4},
 243                 {0, 0},
 244                 {0, 0},
 245                 {0, 0}
 246                 }
 247         },
 248         {1, 0, 2, 0,            /* 0x19 */
 249                 {{0, 0},
 250                 {3, 4},
 251                 {0, 0},
 252                 {0, 0}
 253                 }
 254         },
 255         {0, 0, 2, 0,            /* 0x1a */
 256                 {{1, 1},
 257                 {3, 4},
 258                 {0, 0},
 259                 {0, 0}
 260                 }
 261         },
 262         {1, 0, 2, 0,            /* 0x1b */
 263                 {{0, 1},
 264                 {3, 4},
 265                 {0, 0},
 266                 {0, 0}
 267                 }
 268         },
 269         {0, 0, 1, 0,            /* 0x1c */
 270                 {{2, 4},
 271                 {0, 0},
 272                 {0, 0},
 273                 {0, 0}
 274                 }
 275         },
 276         {1, 0, 2, 0,            /* 0x1d */
 277                 {{0, 0},
 278                 {2, 4},
 279                 {0, 0},
 280                 {0, 0}
 281                 }
 282         },
 283         {0, 0, 1, 0,            /* 0x1e */
 284                 {{1, 4},
 285                 {0, 0},
 286                 {0, 0},
 287                 {0, 0}
 288                 }
 289         },
 290         {1, 0, 1, 0,            /* 0x1f */
 291                 {{0, 4},
 292                 {0, 0},
 293                 {0, 0},
 294                 {0, 0}
 295                 }
 296         },
 297         {0, 0, 1, 0,            /* 0x20 */
 298                 {{5, 5},
 299                 {0, 0},
 300                 {0, 0},
 301                 {0, 0}
 302                 }
 303         },
 304         {1, 0, 2, 0,            /* 0x21 */
 305                 {{0, 0},
 306                 {5, 5},
 307                 {0, 0},
 308                 {0, 0}
 309                 }
 310         },
 311         {0, 0, 2, 0,            /* 0x22 */
 312                 {{1, 1},
 313                 {5, 5},
 314                 {0, 0},
 315                 {0, 0}
 316                 }
 317         },
 318         {1, 0, 2, 0,            /* 0x23 */
 319                 {{0, 1},
 320                 {5, 5},
 321                 {0, 0},
 322                 {0, 0}
 323                 }
 324         },
 325         {0, 0, 2, 0,            /* 0x24 */
 326                 {{2, 2},
 327                 {5, 5},
 328                 {0, 0},
 329                 {0, 0}
 330                 }
 331         },
 332         {1, 0, 3, 0,            /* 0x25 */
 333                 {{0, 0},
 334                 {2, 2},
 335                 {5, 5},
 336                 {0, 0}
 337                 }
 338         },
 339         {0, 0, 2, 0,            /* 0x26 */
 340                 {{1, 2},
 341                 {5, 5},
 342                 {0, 0},
 343                 {0, 0}
 344                 }
 345         },
 346         {1, 0, 2, 0,            /* 0x27 */
 347                 {{0, 2},
 348                 {5, 5},
 349                 {0, 0},
 350                 {0, 0}
 351                 }
 352         },
 353         {0, 0, 2, 0,            /* 0x28 */
 354                 {{3, 3},
 355                 {5, 5},
 356                 {0, 0},
 357                 {0, 0}
 358                 }
 359         },
 360         {1, 0, 3, 0,            /* 0x29 */
 361                 {{0, 0},
 362                 {3, 3},
 363                 {5, 5},
 364                 {0, 0}
 365                 }
 366         },
 367         {0, 0, 3, 0,            /* 0x2a */
 368                 {{1, 1},
 369                 {3, 3},
 370                 {5, 5},
 371                 {0, 0}
 372                 }
 373         },
 374         {1, 0, 3, 0,            /* 0x2b */
 375                 {{0, 1},
 376                 {3, 3},
 377                 {5, 5},
 378                 {0, 0}
 379                 }
 380         },
 381         {0, 0, 2, 0,            /* 0x2c */
 382                 {{2, 3},
 383                 {5, 5},
 384                 {0, 0},
 385                 {0, 0}
 386                 }
 387         },
 388         {1, 0, 3, 0,            /* 0x2d */
 389                 {{0, 0},
 390                 {2, 3},
 391                 {5, 5},
 392                 {0, 0}
 393                 }
 394         },
 395         {0, 0, 2, 0,            /* 0x2e */
 396                 {{1, 3},
 397                 {5, 5},
 398                 {0, 0},
 399                 {0, 0}
 400                 }
 401         },
 402         {1, 0, 2, 0,            /* 0x2f */
 403                 {{0, 3},
 404                 {5, 5},
 405                 {0, 0},
 406                 {0, 0}
 407                 }
 408         },
 409         {0, 0, 1, 0,            /* 0x30 */
 410                 {{4, 5},
 411                 {0, 0},
 412                 {0, 0},
 413                 {0, 0}
 414                 }
 415         },
 416         {1, 0, 2, 0,            /* 0x31 */
 417                 {{0, 0},
 418                 {4, 5},
 419                 {0, 0},
 420                 {0, 0}
 421                 }
 422         },
 423         {0, 0, 2, 0,            /* 0x32 */
 424                 {{1, 1},
 425                 {4, 5},
 426                 {0, 0},
 427                 {0, 0}
 428                 }
 429         },
 430         {1, 0, 2, 0,            /* 0x33 */
 431                 {{0, 1},
 432                 {4, 5},
 433                 {0, 0},
 434                 {0, 0}
 435                 }
 436         },
 437         {0, 0, 2, 0,            /* 0x34 */
 438                 {{2, 2},
 439                 {4, 5},
 440                 {0, 0},
 441                 {0, 0}
 442                 }
 443         },
 444         {1, 0, 3, 0,            /* 0x35 */
 445                 {{0, 0},
 446                 {2, 2},
 447                 {4, 5},
 448                 {0, 0}
 449                 }
 450         },
 451         {0, 0, 2, 0,            /* 0x36 */
 452                 {{1, 2},
 453                 {4, 5},
 454                 {0, 0},
 455                 {0, 0}
 456                 }
 457         },
 458         {1, 0, 2, 0,            /* 0x37 */
 459                 {{0, 2},
 460                 {4, 5},
 461                 {0, 0},
 462                 {0, 0}
 463                 }
 464         },
 465         {0, 0, 1, 0,            /* 0x38 */
 466                 {{3, 5},
 467                 {0, 0},
 468                 {0, 0},
 469                 {0, 0}
 470                 }
 471         },
 472         {1, 0, 2, 0,            /* 0x39 */
 473                 {{0, 0},
 474                 {3, 5},
 475                 {0, 0},
 476                 {0, 0}
 477                 }
 478         },
 479         {0, 0, 2, 0,            /* 0x3a */
 480                 {{1, 1},
 481                 {3, 5},
 482                 {0, 0},
 483                 {0, 0}
 484                 }
 485         },
 486         {1, 0, 2, 0,            /* 0x3b */
 487                 {{0, 1},
 488                 {3, 5},
 489                 {0, 0},
 490                 {0, 0}
 491                 }
 492         },
 493         {0, 0, 1, 0,            /* 0x3c */
 494                 {{2, 5},
 495                 {0, 0},
 496                 {0, 0},
 497                 {0, 0}
 498                 }
 499         },
 500         {1, 0, 2, 0,            /* 0x3d */
 501                 {{0, 0},
 502                 {2, 5},
 503                 {0, 0},
 504                 {0, 0}
 505                 }
 506         },
 507         {0, 0, 1, 0,            /* 0x3e */
 508                 {{1, 5},
 509                 {0, 0},
 510                 {0, 0},
 511                 {0, 0}
 512                 }
 513         },
 514         {1, 0, 1, 0,            /* 0x3f */
 515                 {{0, 5},
 516                 {0, 0},
 517                 {0, 0},
 518                 {0, 0}
 519                 }
 520         },
 521         {0, 0, 1, 0,            /* 0x40 */
 522                 {{6, 6},
 523                 {0, 0},
 524                 {0, 0},
 525                 {0, 0}
 526                 }
 527         },
 528         {1, 0, 2, 0,            /* 0x41 */
 529                 {{0, 0},
 530                 {6, 6},
 531                 {0, 0},
 532                 {0, 0}
 533                 }
 534         },
 535         {0, 0, 2, 0,            /* 0x42 */
 536                 {{1, 1},
 537                 {6, 6},
 538                 {0, 0},
 539                 {0, 0}
 540                 }
 541         },
 542         {1, 0, 2, 0,            /* 0x43 */
 543                 {{0, 1},
 544                 {6, 6},
 545                 {0, 0},
 546                 {0, 0}
 547                 }
 548         },
 549         {0, 0, 2, 0,            /* 0x44 */
 550                 {{2, 2},
 551                 {6, 6},
 552                 {0, 0},
 553                 {0, 0}
 554                 }
 555         },
 556         {1, 0, 3, 0,            /* 0x45 */
 557                 {{0, 0},
 558                 {2, 2},
 559                 {6, 6},
 560                 {0, 0}
 561                 }
 562         },
 563         {0, 0, 2, 0,            /* 0x46 */
 564                 {{1, 2},
 565                 {6, 6},
 566                 {0, 0},
 567                 {0, 0}
 568                 }
 569         },
 570         {1, 0, 2, 0,            /* 0x47 */
 571                 {{0, 2},
 572                 {6, 6},
 573                 {0, 0},
 574                 {0, 0}
 575                 }
 576         },
 577         {0, 0, 2, 0,            /* 0x48 */
 578                 {{3, 3},
 579                 {6, 6},
 580                 {0, 0},
 581                 {0, 0}
 582                 }
 583         },
 584         {1, 0, 3, 0,            /* 0x49 */
 585                 {{0, 0},
 586                 {3, 3},
 587                 {6, 6},
 588                 {0, 0}
 589                 }
 590         },
 591         {0, 0, 3, 0,            /* 0x4a */
 592                 {{1, 1},
 593                 {3, 3},
 594                 {6, 6},
 595                 {0, 0}
 596                 }
 597         },
 598         {1, 0, 3, 0,            /* 0x4b */
 599                 {{0, 1},
 600                 {3, 3},
 601                 {6, 6},
 602                 {0, 0}
 603                 }
 604         },
 605         {0, 0, 2, 0,            /* 0x4c */
 606                 {{2, 3},
 607                 {6, 6},
 608                 {0, 0},
 609                 {0, 0}
 610                 }
 611         },
 612         {1, 0, 3, 0,            /* 0x4d */
 613                 {{0, 0},
 614                 {2, 3},
 615                 {6, 6},
 616                 {0, 0}
 617                 }
 618         },
 619         {0, 0, 2, 0,            /* 0x4e */
 620                 {{1, 3},
 621                 {6, 6},
 622                 {0, 0},
 623                 {0, 0}
 624                 }
 625         },
 626         {1, 0, 2, 0,            /* 0x4f */
 627                 {{0, 3},
 628                 {6, 6},
 629                 {0, 0},
 630                 {0, 0}
 631                 }
 632         },
 633         {0, 0, 2, 0,            /* 0x50 */
 634                 {{4, 4},
 635                 {6, 6},
 636                 {0, 0},
 637                 {0, 0}
 638                 }
 639         },
 640         {1, 0, 3, 0,            /* 0x51 */
 641                 {{0, 0},
 642                 {4, 4},
 643                 {6, 6},
 644                 {0, 0}
 645                 }
 646         },
 647         {0, 0, 3, 0,            /* 0x52 */
 648                 {{1, 1},
 649                 {4, 4},
 650                 {6, 6},
 651                 {0, 0}
 652                 }
 653         },
 654         {1, 0, 3, 0,            /* 0x53 */
 655                 {{0, 1},
 656                 {4, 4},
 657                 {6, 6},
 658                 {0, 0}
 659                 }
 660         },
 661         {0, 0, 3, 0,            /* 0x54 */
 662                 {{2, 2},
 663                 {4, 4},
 664                 {6, 6},
 665                 {0, 0}
 666                 }
 667         },
 668         {1, 0, 4, 0,            /* 0x55 */
 669                 {{0, 0},
 670                 {2, 2},
 671                 {4, 4},
 672                 {6, 6}
 673                 }
 674         },
 675         {0, 0, 3, 0,            /* 0x56 */
 676                 {{1, 2},
 677                 {4, 4},
 678                 {6, 6},
 679                 {0, 0}
 680                 }
 681         },
 682         {1, 0, 3, 0,            /* 0x57 */
 683                 {{0, 2},
 684                 {4, 4},
 685                 {6, 6},
 686                 {0, 0}
 687                 }
 688         },
 689         {0, 0, 2, 0,            /* 0x58 */
 690                 {{3, 4},
 691                 {6, 6},
 692                 {0, 0},
 693                 {0, 0}
 694                 }
 695         },
 696         {1, 0, 3, 0,            /* 0x59 */
 697                 {{0, 0},
 698                 {3, 4},
 699                 {6, 6},
 700                 {0, 0}
 701                 }
 702         },
 703         {0, 0, 3, 0,            /* 0x5a */
 704                 {{1, 1},
 705                 {3, 4},
 706                 {6, 6},
 707                 {0, 0}
 708                 }
 709         },
 710         {1, 0, 3, 0,            /* 0x5b */
 711                 {{0, 1},
 712                 {3, 4},
 713                 {6, 6},
 714                 {0, 0}
 715                 }
 716         },
 717         {0, 0, 2, 0,            /* 0x5c */
 718                 {{2, 4},
 719                 {6, 6},
 720                 {0, 0},
 721                 {0, 0}
 722                 }
 723         },
 724         {1, 0, 3, 0,            /* 0x5d */
 725                 {{0, 0},
 726                 {2, 4},
 727                 {6, 6},
 728                 {0, 0}
 729                 }
 730         },
 731         {0, 0, 2, 0,            /* 0x5e */
 732                 {{1, 4},
 733                 {6, 6},
 734                 {0, 0},
 735                 {0, 0}
 736                 }
 737         },
 738         {1, 0, 2, 0,            /* 0x5f */
 739                 {{0, 4},
 740                 {6, 6},
 741                 {0, 0},
 742                 {0, 0}
 743                 }
 744         },
 745         {0, 0, 1, 0,            /* 0x60 */
 746                 {{5, 6},
 747                 {0, 0},
 748                 {0, 0},
 749                 {0, 0}
 750                 }
 751         },
 752         {1, 0, 2, 0,            /* 0x61 */
 753                 {{0, 0},
 754                 {5, 6},
 755                 {0, 0},
 756                 {0, 0}
 757                 }
 758         },
 759         {0, 0, 2, 0,            /* 0x62 */
 760                 {{1, 1},
 761                 {5, 6},
 762                 {0, 0},
 763                 {0, 0}
 764                 }
 765         },
 766         {1, 0, 2, 0,            /* 0x63 */
 767                 {{0, 1},
 768                 {5, 6},
 769                 {0, 0},
 770                 {0, 0}
 771                 }
 772         },
 773         {0, 0, 2, 0,            /* 0x64 */
 774                 {{2, 2},
 775                 {5, 6},
 776                 {0, 0},
 777                 {0, 0}
 778                 }
 779         },
 780         {1, 0, 3, 0,            /* 0x65 */
 781                 {{0, 0},
 782                 {2, 2},
 783                 {5, 6},
 784                 {0, 0}
 785                 }
 786         },
 787         {0, 0, 2, 0,            /* 0x66 */
 788                 {{1, 2},
 789                 {5, 6},
 790                 {0, 0},
 791                 {0, 0}
 792                 }
 793         },
 794         {1, 0, 2, 0,            /* 0x67 */
 795                 {{0, 2},
 796                 {5, 6},
 797                 {0, 0},
 798                 {0, 0}
 799                 }
 800         },
 801         {0, 0, 2, 0,            /* 0x68 */
 802                 {{3, 3},
 803                 {5, 6},
 804                 {0, 0},
 805                 {0, 0}
 806                 }
 807         },
 808         {1, 0, 3, 0,            /* 0x69 */
 809                 {{0, 0},
 810                 {3, 3},
 811                 {5, 6},
 812                 {0, 0}
 813                 }
 814         },
 815         {0, 0, 3, 0,            /* 0x6a */
 816                 {{1, 1},
 817                 {3, 3},
 818                 {5, 6},
 819                 {0, 0}
 820                 }
 821         },
 822         {1, 0, 3, 0,            /* 0x6b */
 823                 {{0, 1},
 824                 {3, 3},
 825                 {5, 6},
 826                 {0, 0}
 827                 }
 828         },
 829         {0, 0, 2, 0,            /* 0x6c */
 830                 {{2, 3},
 831                 {5, 6},
 832                 {0, 0},
 833                 {0, 0}
 834                 }
 835         },
 836         {1, 0, 3, 0,            /* 0x6d */
 837                 {{0, 0},
 838                 {2, 3},
 839                 {5, 6},
 840                 {0, 0}
 841                 }
 842         },
 843         {0, 0, 2, 0,            /* 0x6e */
 844                 {{1, 3},
 845                 {5, 6},
 846                 {0, 0},
 847                 {0, 0}
 848                 }
 849         },
 850         {1, 0, 2, 0,            /* 0x6f */
 851                 {{0, 3},
 852                 {5, 6},
 853                 {0, 0},
 854                 {0, 0}
 855                 }
 856         },
 857         {0, 0, 1, 0,            /* 0x70 */
 858                 {{4, 6},
 859                 {0, 0},
 860                 {0, 0},
 861                 {0, 0}
 862                 }
 863         },
 864         {1, 0, 2, 0,            /* 0x71 */
 865                 {{0, 0},
 866                 {4, 6},
 867                 {0, 0},
 868                 {0, 0}
 869                 }
 870         },
 871         {0, 0, 2, 0,            /* 0x72 */
 872                 {{1, 1},
 873                 {4, 6},
 874                 {0, 0},
 875                 {0, 0}
 876                 }
 877         },
 878         {1, 0, 2, 0,            /* 0x73 */
 879                 {{0, 1},
 880                 {4, 6},
 881                 {0, 0},
 882                 {0, 0}
 883                 }
 884         },
 885         {0, 0, 2, 0,            /* 0x74 */
 886                 {{2, 2},
 887                 {4, 6},
 888                 {0, 0},
 889                 {0, 0}
 890                 }
 891         },
 892         {1, 0, 3, 0,            /* 0x75 */
 893                 {{0, 0},
 894                 {2, 2},
 895                 {4, 6},
 896                 {0, 0}
 897                 }
 898         },
 899         {0, 0, 2, 0,            /* 0x76 */
 900                 {{1, 2},
 901                 {4, 6},
 902                 {0, 0},
 903                 {0, 0}
 904                 }
 905         },
 906         {1, 0, 2, 0,            /* 0x77 */
 907                 {{0, 2},
 908                 {4, 6},
 909                 {0, 0},
 910                 {0, 0}
 911                 }
 912         },
 913         {0, 0, 1, 0,            /* 0x78 */
 914                 {{3, 6},
 915                 {0, 0},
 916                 {0, 0},
 917                 {0, 0}
 918                 }
 919         },
 920         {1, 0, 2, 0,            /* 0x79 */
 921                 {{0, 0},
 922                 {3, 6},
 923                 {0, 0},
 924                 {0, 0}
 925                 }
 926         },
 927         {0, 0, 2, 0,            /* 0x7a */
 928                 {{1, 1},
 929                 {3, 6},
 930                 {0, 0},
 931                 {0, 0}
 932                 }
 933         },
 934         {1, 0, 2, 0,            /* 0x7b */
 935                 {{0, 1},
 936                 {3, 6},
 937                 {0, 0},
 938                 {0, 0}
 939                 }
 940         },
 941         {0, 0, 1, 0,            /* 0x7c */
 942                 {{2, 6},
 943                 {0, 0},
 944                 {0, 0},
 945                 {0, 0}
 946                 }
 947         },
 948         {1, 0, 2, 0,            /* 0x7d */
 949                 {{0, 0},
 950                 {2, 6},
 951                 {0, 0},
 952                 {0, 0}
 953                 }
 954         },
 955         {0, 0, 1, 0,            /* 0x7e */
 956                 {{1, 6},
 957                 {0, 0},
 958                 {0, 0},
 959                 {0, 0}
 960                 }
 961         },
 962         {1, 0, 1, 0,            /* 0x7f */
 963                 {{0, 6},
 964                 {0, 0},
 965                 {0, 0},
 966                 {0, 0}
 967                 }
 968         },
 969         {0, 1, 1, 0,            /* 0x80 */
 970                 {{7, 7},
 971                 {0, 0},
 972                 {0, 0},
 973                 {0, 0}
 974                 }
 975         },
 976         {1, 1, 2, 0,            /* 0x81 */
 977                 {{0, 0},
 978                 {7, 7},
 979                 {0, 0},
 980                 {0, 0}
 981                 }
 982         },
 983         {0, 1, 2, 0,            /* 0x82 */
 984                 {{1, 1},
 985                 {7, 7},
 986                 {0, 0},
 987                 {0, 0}
 988                 }
 989         },
 990         {1, 1, 2, 0,            /* 0x83 */
 991                 {{0, 1},
 992                 {7, 7},
 993                 {0, 0},
 994                 {0, 0}
 995                 }
 996         },
 997         {0, 1, 2, 0,            /* 0x84 */
 998                 {{2, 2},
 999                 {7, 7},
1000                 {0, 0},
1001                 {0, 0}
1002                 }
1003         },
1004         {1, 1, 3, 0,            /* 0x85 */
1005                 {{0, 0},
1006                 {2, 2},
1007                 {7, 7},
1008                 {0, 0}
1009                 }
1010         },
1011         {0, 1, 2, 0,            /* 0x86 */
1012                 {{1, 2},
1013                 {7, 7},
1014                 {0, 0},
1015                 {0, 0}
1016                 }
1017         },
1018         {1, 1, 2, 0,            /* 0x87 */
1019                 {{0, 2},
1020                 {7, 7},
1021                 {0, 0},
1022                 {0, 0}
1023                 }
1024         },
1025         {0, 1, 2, 0,            /* 0x88 */
1026                 {{3, 3},
1027                 {7, 7},
1028                 {0, 0},
1029                 {0, 0}
1030                 }
1031         },
1032         {1, 1, 3, 0,            /* 0x89 */
1033                 {{0, 0},
1034                 {3, 3},
1035                 {7, 7},
1036                 {0, 0}
1037                 }
1038         },
1039         {0, 1, 3, 0,            /* 0x8a */
1040                 {{1, 1},
1041                 {3, 3},
1042                 {7, 7},
1043                 {0, 0}
1044                 }
1045         },
1046         {1, 1, 3, 0,            /* 0x8b */
1047                 {{0, 1},
1048                 {3, 3},
1049                 {7, 7},
1050                 {0, 0}
1051                 }
1052         },
1053         {0, 1, 2, 0,            /* 0x8c */
1054                 {{2, 3},
1055                 {7, 7},
1056                 {0, 0},
1057                 {0, 0}
1058                 }
1059         },
1060         {1, 1, 3, 0,            /* 0x8d */
1061                 {{0, 0},
1062                 {2, 3},
1063                 {7, 7},
1064                 {0, 0}
1065                 }
1066         },
1067         {0, 1, 2, 0,            /* 0x8e */
1068                 {{1, 3},
1069                 {7, 7},
1070                 {0, 0},
1071                 {0, 0}
1072                 }
1073         },
1074         {1, 1, 2, 0,            /* 0x8f */
1075                 {{0, 3},
1076                 {7, 7},
1077                 {0, 0},
1078                 {0, 0}
1079                 }
1080         },
1081         {0, 1, 2, 0,            /* 0x90 */
1082                 {{4, 4},
1083                 {7, 7},
1084                 {0, 0},
1085                 {0, 0}
1086                 }
1087         },
1088         {1, 1, 3, 0,            /* 0x91 */
1089                 {{0, 0},
1090                 {4, 4},
1091                 {7, 7},
1092                 {0, 0}
1093                 }
1094         },
1095         {0, 1, 3, 0,            /* 0x92 */
1096                 {{1, 1},
1097                 {4, 4},
1098                 {7, 7},
1099                 {0, 0}
1100                 }
1101         },
1102         {1, 1, 3, 0,            /* 0x93 */
1103                 {{0, 1},
1104                 {4, 4},
1105                 {7, 7},
1106                 {0, 0}
1107                 }
1108         },
1109         {0, 1, 3, 0,            /* 0x94 */
1110                 {{2, 2},
1111                 {4, 4},
1112                 {7, 7},
1113                 {0, 0}
1114                 }
1115         },
1116         {1, 1, 4, 0,            /* 0x95 */
1117                 {{0, 0},
1118                 {2, 2},
1119                 {4, 4},
1120                 {7, 7}
1121                 }
1122         },
1123         {0, 1, 3, 0,            /* 0x96 */
1124                 {{1, 2},
1125                 {4, 4},
1126                 {7, 7},
1127                 {0, 0}
1128                 }
1129         },
1130         {1, 1, 3, 0,            /* 0x97 */
1131                 {{0, 2},
1132                 {4, 4},
1133                 {7, 7},
1134                 {0, 0}
1135                 }
1136         },
1137         {0, 1, 2, 0,            /* 0x98 */
1138                 {{3, 4},
1139                 {7, 7},
1140                 {0, 0},
1141                 {0, 0}
1142                 }
1143         },
1144         {1, 1, 3, 0,            /* 0x99 */
1145                 {{0, 0},
1146                 {3, 4},
1147                 {7, 7},
1148                 {0, 0}
1149                 }
1150         },
1151         {0, 1, 3, 0,            /* 0x9a */
1152                 {{1, 1},
1153                 {3, 4},
1154                 {7, 7},
1155                 {0, 0}
1156                 }
1157         },
1158         {1, 1, 3, 0,            /* 0x9b */
1159                 {{0, 1},
1160                 {3, 4},
1161                 {7, 7},
1162                 {0, 0}
1163                 }
1164         },
1165         {0, 1, 2, 0,            /* 0x9c */
1166                 {{2, 4},
1167                 {7, 7},
1168                 {0, 0},
1169                 {0, 0}
1170                 }
1171         },
1172         {1, 1, 3, 0,            /* 0x9d */
1173                 {{0, 0},
1174                 {2, 4},
1175                 {7, 7},
1176                 {0, 0}
1177                 }
1178         },
1179         {0, 1, 2, 0,            /* 0x9e */
1180                 {{1, 4},
1181                 {7, 7},
1182                 {0, 0},
1183                 {0, 0}
1184                 }
1185         },
1186         {1, 1, 2, 0,            /* 0x9f */
1187                 {{0, 4},
1188                 {7, 7},
1189                 {0, 0},
1190                 {0, 0}
1191                 }
1192         },
1193         {0, 1, 2, 0,            /* 0xa0 */
1194                 {{5, 5},
1195                 {7, 7},
1196                 {0, 0},
1197                 {0, 0}
1198                 }
1199         },
1200         {1, 1, 3, 0,            /* 0xa1 */
1201                 {{0, 0},
1202                 {5, 5},
1203                 {7, 7},
1204                 {0, 0}
1205                 }
1206         },
1207         {0, 1, 3, 0,            /* 0xa2 */
1208                 {{1, 1},
1209                 {5, 5},
1210                 {7, 7},
1211                 {0, 0}
1212                 }
1213         },
1214         {1, 1, 3, 0,            /* 0xa3 */
1215                 {{0, 1},
1216                 {5, 5},
1217                 {7, 7},
1218                 {0, 0}
1219                 }
1220         },
1221         {0, 1, 3, 0,            /* 0xa4 */
1222                 {{2, 2},
1223                 {5, 5},
1224                 {7, 7},
1225                 {0, 0}
1226                 }
1227         },
1228         {1, 1, 4, 0,            /* 0xa5 */
1229                 {{0, 0},
1230                 {2, 2},
1231                 {5, 5},
1232                 {7, 7}
1233                 }
1234         },
1235         {0, 1, 3, 0,            /* 0xa6 */
1236                 {{1, 2},
1237                 {5, 5},
1238                 {7, 7},
1239                 {0, 0}
1240                 }
1241         },
1242         {1, 1, 3, 0,            /* 0xa7 */
1243                 {{0, 2},
1244                 {5, 5},
1245                 {7, 7},
1246                 {0, 0}
1247                 }
1248         },
1249         {0, 1, 3, 0,            /* 0xa8 */
1250                 {{3, 3},
1251                 {5, 5},
1252                 {7, 7},
1253                 {0, 0}
1254                 }
1255         },
1256         {1, 1, 4, 0,            /* 0xa9 */
1257                 {{0, 0},
1258                 {3, 3},
1259                 {5, 5},
1260                 {7, 7}
1261                 }
1262         },
1263         {0, 1, 4, 0,            /* 0xaa */
1264                 {{1, 1},
1265                 {3, 3},
1266                 {5, 5},
1267                 {7, 7}
1268                 }
1269         },
1270         {1, 1, 4, 0,            /* 0xab */
1271                 {{0, 1},
1272                 {3, 3},
1273                 {5, 5},
1274                 {7, 7}
1275                 }
1276         },
1277         {0, 1, 3, 0,            /* 0xac */
1278                 {{2, 3},
1279                 {5, 5},
1280                 {7, 7},
1281                 {0, 0}
1282                 }
1283         },
1284         {1, 1, 4, 0,            /* 0xad */
1285                 {{0, 0},
1286                 {2, 3},
1287                 {5, 5},
1288                 {7, 7}
1289                 }
1290         },
1291         {0, 1, 3, 0,            /* 0xae */
1292                 {{1, 3},
1293                 {5, 5},
1294                 {7, 7},
1295                 {0, 0}
1296                 }
1297         },
1298         {1, 1, 3, 0,            /* 0xaf */
1299                 {{0, 3},
1300                 {5, 5},
1301                 {7, 7},
1302                 {0, 0}
1303                 }
1304         },
1305         {0, 1, 2, 0,            /* 0xb0 */
1306                 {{4, 5},
1307                 {7, 7},
1308                 {0, 0},
1309                 {0, 0}
1310                 }
1311         },
1312         {1, 1, 3, 0,            /* 0xb1 */
1313                 {{0, 0},
1314                 {4, 5},
1315                 {7, 7},
1316                 {0, 0}
1317                 }
1318         },
1319         {0, 1, 3, 0,            /* 0xb2 */
1320                 {{1, 1},
1321                 {4, 5},
1322                 {7, 7},
1323                 {0, 0}
1324                 }
1325         },
1326         {1, 1, 3, 0,            /* 0xb3 */
1327                 {{0, 1},
1328                 {4, 5},
1329                 {7, 7},
1330                 {0, 0}
1331                 }
1332         },
1333         {0, 1, 3, 0,            /* 0xb4 */
1334                 {{2, 2},
1335                 {4, 5},
1336                 {7, 7},
1337                 {0, 0}
1338                 }
1339         },
1340         {1, 1, 4, 0,            /* 0xb5 */
1341                 {{0, 0},
1342                 {2, 2},
1343                 {4, 5},
1344                 {7, 7}
1345                 }
1346         },
1347         {0, 1, 3, 0,            /* 0xb6 */
1348                 {{1, 2},
1349                 {4, 5},
1350                 {7, 7},
1351                 {0, 0}
1352                 }
1353         },
1354         {1, 1, 3, 0,            /* 0xb7 */
1355                 {{0, 2},
1356                 {4, 5},
1357                 {7, 7},
1358                 {0, 0}
1359                 }
1360         },
1361         {0, 1, 2, 0,            /* 0xb8 */
1362                 {{3, 5},
1363                 {7, 7},
1364                 {0, 0},
1365                 {0, 0}
1366                 }
1367         },
1368         {1, 1, 3, 0,            /* 0xb9 */
1369                 {{0, 0},
1370                 {3, 5},
1371                 {7, 7},
1372                 {0, 0}
1373                 }
1374         },
1375         {0, 1, 3, 0,            /* 0xba */
1376                 {{1, 1},
1377                 {3, 5},
1378                 {7, 7},
1379                 {0, 0}
1380                 }
1381         },
1382         {1, 1, 3, 0,            /* 0xbb */
1383                 {{0, 1},
1384                 {3, 5},
1385                 {7, 7},
1386                 {0, 0}
1387                 }
1388         },
1389         {0, 1, 2, 0,            /* 0xbc */
1390                 {{2, 5},
1391                 {7, 7},
1392                 {0, 0},
1393                 {0, 0}
1394                 }
1395         },
1396         {1, 1, 3, 0,            /* 0xbd */
1397                 {{0, 0},
1398                 {2, 5},
1399                 {7, 7},
1400                 {0, 0}
1401                 }
1402         },
1403         {0, 1, 2, 0,            /* 0xbe */
1404                 {{1, 5},
1405                 {7, 7},
1406                 {0, 0},
1407                 {0, 0}
1408                 }
1409         },
1410         {1, 1, 2, 0,            /* 0xbf */
1411                 {{0, 5},
1412                 {7, 7},
1413                 {0, 0},
1414                 {0, 0}
1415                 }
1416         },
1417         {0, 1, 1, 0,            /* 0xc0 */
1418                 {{6, 7},
1419                 {0, 0},
1420                 {0, 0},
1421                 {0, 0}
1422                 }
1423         },
1424         {1, 1, 2, 0,            /* 0xc1 */
1425                 {{0, 0},
1426                 {6, 7},
1427                 {0, 0},
1428                 {0, 0}
1429                 }
1430         },
1431         {0, 1, 2, 0,            /* 0xc2 */
1432                 {{1, 1},
1433                 {6, 7},
1434                 {0, 0},
1435                 {0, 0}
1436                 }
1437         },
1438         {1, 1, 2, 0,            /* 0xc3 */
1439                 {{0, 1},
1440                 {6, 7},
1441                 {0, 0},
1442                 {0, 0}
1443                 }
1444         },
1445         {0, 1, 2, 0,            /* 0xc4 */
1446                 {{2, 2},
1447                 {6, 7},
1448                 {0, 0},
1449                 {0, 0}
1450                 }
1451         },
1452         {1, 1, 3, 0,            /* 0xc5 */
1453                 {{0, 0},
1454                 {2, 2},
1455                 {6, 7},
1456                 {0, 0}
1457                 }
1458         },
1459         {0, 1, 2, 0,            /* 0xc6 */
1460                 {{1, 2},
1461                 {6, 7},
1462                 {0, 0},
1463                 {0, 0}
1464                 }
1465         },
1466         {1, 1, 2, 0,            /* 0xc7 */
1467                 {{0, 2},
1468                 {6, 7},
1469                 {0, 0},
1470                 {0, 0}
1471                 }
1472         },
1473         {0, 1, 2, 0,            /* 0xc8 */
1474                 {{3, 3},
1475                 {6, 7},
1476                 {0, 0},
1477                 {0, 0}
1478                 }
1479         },
1480         {1, 1, 3, 0,            /* 0xc9 */
1481                 {{0, 0},
1482                 {3, 3},
1483                 {6, 7},
1484                 {0, 0}
1485                 }
1486         },
1487         {0, 1, 3, 0,            /* 0xca */
1488                 {{1, 1},
1489                 {3, 3},
1490                 {6, 7},
1491                 {0, 0}
1492                 }
1493         },
1494         {1, 1, 3, 0,            /* 0xcb */
1495                 {{0, 1},
1496                 {3, 3},
1497                 {6, 7},
1498                 {0, 0}
1499                 }
1500         },
1501         {0, 1, 2, 0,            /* 0xcc */
1502                 {{2, 3},
1503                 {6, 7},
1504                 {0, 0},
1505                 {0, 0}
1506                 }
1507         },
1508         {1, 1, 3, 0,            /* 0xcd */
1509                 {{0, 0},
1510                 {2, 3},
1511                 {6, 7},
1512                 {0, 0}
1513                 }
1514         },
1515         {0, 1, 2, 0,            /* 0xce */
1516                 {{1, 3},
1517                 {6, 7},
1518                 {0, 0},
1519                 {0, 0}
1520                 }
1521         },
1522         {1, 1, 2, 0,            /* 0xcf */
1523                 {{0, 3},
1524                 {6, 7},
1525                 {0, 0},
1526                 {0, 0}
1527                 }
1528         },
1529         {0, 1, 2, 0,            /* 0xd0 */
1530                 {{4, 4},
1531                 {6, 7},
1532                 {0, 0},
1533                 {0, 0}
1534                 }
1535         },
1536         {1, 1, 3, 0,            /* 0xd1 */
1537                 {{0, 0},
1538                 {4, 4},
1539                 {6, 7},
1540                 {0, 0}
1541                 }
1542         },
1543         {0, 1, 3, 0,            /* 0xd2 */
1544                 {{1, 1},
1545                 {4, 4},
1546                 {6, 7},
1547                 {0, 0}
1548                 }
1549         },
1550         {1, 1, 3, 0,            /* 0xd3 */
1551                 {{0, 1},
1552                 {4, 4},
1553                 {6, 7},
1554                 {0, 0}
1555                 }
1556         },
1557         {0, 1, 3, 0,            /* 0xd4 */
1558                 {{2, 2},
1559                 {4, 4},
1560                 {6, 7},
1561                 {0, 0}
1562                 }
1563         },
1564         {1, 1, 4, 0,            /* 0xd5 */
1565                 {{0, 0},
1566                 {2, 2},
1567                 {4, 4},
1568                 {6, 7}
1569                 }
1570         },
1571         {0, 1, 3, 0,            /* 0xd6 */
1572                 {{1, 2},
1573                 {4, 4},
1574                 {6, 7},
1575                 {0, 0}
1576                 }
1577         },
1578         {1, 1, 3, 0,            /* 0xd7 */
1579                 {{0, 2},
1580                 {4, 4},
1581                 {6, 7},
1582                 {0, 0}
1583                 }
1584         },
1585         {0, 1, 2, 0,            /* 0xd8 */
1586                 {{3, 4},
1587                 {6, 7},
1588                 {0, 0},
1589                 {0, 0}
1590                 }
1591         },
1592         {1, 1, 3, 0,            /* 0xd9 */
1593                 {{0, 0},
1594                 {3, 4},
1595                 {6, 7},
1596                 {0, 0}
1597                 }
1598         },
1599         {0, 1, 3, 0,            /* 0xda */
1600                 {{1, 1},
1601                 {3, 4},
1602                 {6, 7},
1603                 {0, 0}
1604                 }
1605         },
1606         {1, 1, 3, 0,            /* 0xdb */
1607                 {{0, 1},
1608                 {3, 4},
1609                 {6, 7},
1610                 {0, 0}
1611                 }
1612         },
1613         {0, 1, 2, 0,            /* 0xdc */
1614                 {{2, 4},
1615                 {6, 7},
1616                 {0, 0},
1617                 {0, 0}
1618                 }
1619         },
1620         {1, 1, 3, 0,            /* 0xdd */
1621                 {{0, 0},
1622                 {2, 4},
1623                 {6, 7},
1624                 {0, 0}
1625                 }
1626         },
1627         {0, 1, 2, 0,            /* 0xde */
1628                 {{1, 4},
1629                 {6, 7},
1630                 {0, 0},
1631                 {0, 0}
1632                 }
1633         },
1634         {1, 1, 2, 0,            /* 0xdf */
1635                 {{0, 4},
1636                 {6, 7},
1637                 {0, 0},
1638                 {0, 0}
1639                 }
1640         },
1641         {0, 1, 1, 0,            /* 0xe0 */
1642                 {{5, 7},
1643                 {0, 0},
1644                 {0, 0},
1645                 {0, 0}
1646                 }
1647         },
1648         {1, 1, 2, 0,            /* 0xe1 */
1649                 {{0, 0},
1650                 {5, 7},
1651                 {0, 0},
1652                 {0, 0}
1653                 }
1654         },
1655         {0, 1, 2, 0,            /* 0xe2 */
1656                 {{1, 1},
1657                 {5, 7},
1658                 {0, 0},
1659                 {0, 0}
1660                 }
1661         },
1662         {1, 1, 2, 0,            /* 0xe3 */
1663                 {{0, 1},
1664                 {5, 7},
1665                 {0, 0},
1666                 {0, 0}
1667                 }
1668         },
1669         {0, 1, 2, 0,            /* 0xe4 */
1670                 {{2, 2},
1671                 {5, 7},
1672                 {0, 0},
1673                 {0, 0}
1674                 }
1675         },
1676         {1, 1, 3, 0,            /* 0xe5 */
1677                 {{0, 0},
1678                 {2, 2},
1679                 {5, 7},
1680                 {0, 0}
1681                 }
1682         },
1683         {0, 1, 2, 0,            /* 0xe6 */
1684                 {{1, 2},
1685                 {5, 7},
1686                 {0, 0},
1687                 {0, 0}
1688                 }
1689         },
1690         {1, 1, 2, 0,            /* 0xe7 */
1691                 {{0, 2},
1692                 {5, 7},
1693                 {0, 0},
1694                 {0, 0}
1695                 }
1696         },
1697         {0, 1, 2, 0,            /* 0xe8 */
1698                 {{3, 3},
1699                 {5, 7},
1700                 {0, 0},
1701                 {0, 0}
1702                 }
1703         },
1704         {1, 1, 3, 0,            /* 0xe9 */
1705                 {{0, 0},
1706                 {3, 3},
1707                 {5, 7},
1708                 {0, 0}
1709                 }
1710         },
1711         {0, 1, 3, 0,            /* 0xea */
1712                 {{1, 1},
1713                 {3, 3},
1714                 {5, 7},
1715                 {0, 0}
1716                 }
1717         },
1718         {1, 1, 3, 0,            /* 0xeb */
1719                 {{0, 1},
1720                 {3, 3},
1721                 {5, 7},
1722                 {0, 0}
1723                 }
1724         },
1725         {0, 1, 2, 0,            /* 0xec */
1726                 {{2, 3},
1727                 {5, 7},
1728                 {0, 0},
1729                 {0, 0}
1730                 }
1731         },
1732         {1, 1, 3, 0,            /* 0xed */
1733                 {{0, 0},
1734                 {2, 3},
1735                 {5, 7},
1736                 {0, 0}
1737                 }
1738         },
1739         {0, 1, 2, 0,            /* 0xee */
1740                 {{1, 3},
1741                 {5, 7},
1742                 {0, 0},
1743                 {0, 0}
1744                 }
1745         },
1746         {1, 1, 2, 0,            /* 0xef */
1747                 {{0, 3},
1748                 {5, 7},
1749                 {0, 0},
1750                 {0, 0}
1751                 }
1752         },
1753         {0, 1, 1, 0,            /* 0xf0 */
1754                 {{4, 7},
1755                 {0, 0},
1756                 {0, 0},
1757                 {0, 0}
1758                 }
1759         },
1760         {1, 1, 2, 0,            /* 0xf1 */
1761                 {{0, 0},
1762                 {4, 7},
1763                 {0, 0},
1764                 {0, 0}
1765                 }
1766         },
1767         {0, 1, 2, 0,            /* 0xf2 */
1768                 {{1, 1},
1769                 {4, 7},
1770                 {0, 0},
1771                 {0, 0}
1772                 }
1773         },
1774         {1, 1, 2, 0,            /* 0xf3 */
1775                 {{0, 1},
1776                 {4, 7},
1777                 {0, 0},
1778                 {0, 0}
1779                 }
1780         },
1781         {0, 1, 2, 0,            /* 0xf4 */
1782                 {{2, 2},
1783                 {4, 7},
1784                 {0, 0},
1785                 {0, 0}
1786                 }
1787         },
1788         {1, 1, 3, 0,            /* 0xf5 */
1789                 {{0, 0},
1790                 {2, 2},
1791                 {4, 7},
1792                 {0, 0}
1793                 }
1794         },
1795         {0, 1, 2, 0,            /* 0xf6 */
1796                 {{1, 2},
1797                 {4, 7},
1798                 {0, 0},
1799                 {0, 0}
1800                 }
1801         },
1802         {1, 1, 2, 0,            /* 0xf7 */
1803                 {{0, 2},
1804                 {4, 7},
1805                 {0, 0},
1806                 {0, 0}
1807                 }
1808         },
1809         {0, 1, 1, 0,            /* 0xf8 */
1810                 {{3, 7},
1811                 {0, 0},
1812                 {0, 0},
1813                 {0, 0}
1814                 }
1815         },
1816         {1, 1, 2, 0,            /* 0xf9 */
1817                 {{0, 0},
1818                 {3, 7},
1819                 {0, 0},
1820                 {0, 0}
1821                 }
1822         },
1823         {0, 1, 2, 0,            /* 0xfa */
1824                 {{1, 1},
1825                 {3, 7},
1826                 {0, 0},
1827                 {0, 0}
1828                 }
1829         },
1830         {1, 1, 2, 0,            /* 0xfb */
1831                 {{0, 1},
1832                 {3, 7},
1833                 {0, 0},
1834                 {0, 0}
1835                 }
1836         },
1837         {0, 1, 1, 0,            /* 0xfc */
1838                 {{2, 7},
1839                 {0, 0},
1840                 {0, 0},
1841                 {0, 0}
1842                 }
1843         },
1844         {1, 1, 2, 0,            /* 0xfd */
1845                 {{0, 0},
1846                 {2, 7},
1847                 {0, 0},
1848                 {0, 0}
1849                 }
1850         },
1851         {0, 1, 1, 0,            /* 0xfe */
1852                 {{1, 7},
1853                 {0, 0},
1854                 {0, 0},
1855                 {0, 0}
1856                 }
1857         },
1858         {1, 1, 1, 0,            /* 0xff */
1859                 {{0, 7},
1860                 {0, 0},
1861                 {0, 0},
1862                 {0, 0}
1863                 }
1864         }
1865 };
1866
1867
1868 int
1869 sctp_is_address_in_scope(struct sctp_ifa *ifa,
1870     struct sctp_scoping *scope,
1871     int do_update)
1872 {
1873         if ((scope->loopback_scope == 0) &&
1874             (ifa->ifn_p) && SCTP_IFN_IS_IFT_LOOP(ifa->ifn_p)) {
1875                 /*
1876                  * skip loopback if not in scope *
1877                  */
1878                 return (0);
1879         }
1880         switch (ifa->address.sa.sa_family) {
1881 #ifdef INET
1882         case AF_INET:
1883                 if (scope->ipv4_addr_legal) {
1884                         struct sockaddr_in *sin;
1885
1886                         sin = &ifa->address.sin;
1887                         if (sin->sin_addr.s_addr == 0) {
1888                                 /* not in scope , unspecified */
1889                                 return (0);
1890                         }
1891                         if ((scope->ipv4_local_scope == 0) &&
1892                             (IN4_ISPRIVATE_ADDRESS(&sin->sin_addr))) {
1893                                 /* private address not in scope */
1894                                 return (0);
1895                         }
1896                 } else {
1897                         return (0);
1898                 }
1899                 break;
1900 #endif
1901 #ifdef INET6
1902         case AF_INET6:
1903                 if (scope->ipv6_addr_legal) {
1904                         struct sockaddr_in6 *sin6;
1905
1906                         /*
1907                          * Must update the flags,  bummer, which means any
1908                          * IFA locks must now be applied HERE <->
1909                          */
1910                         if (do_update) {
1911                                 sctp_gather_internal_ifa_flags(ifa);
1912                         }
1913                         if (ifa->localifa_flags & SCTP_ADDR_IFA_UNUSEABLE) {
1914                                 return (0);
1915                         }
1916                         /* ok to use deprecated addresses? */
1917                         sin6 = &ifa->address.sin6;
1918                         if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) {
1919                                 /* skip unspecifed addresses */
1920                                 return (0);
1921                         }
1922                         if (    /* (local_scope == 0) && */
1923                             (IN6_IS_ADDR_LINKLOCAL(&sin6->sin6_addr))) {
1924                                 return (0);
1925                         }
1926                         if ((scope->site_scope == 0) &&
1927                             (IN6_IS_ADDR_SITELOCAL(&sin6->sin6_addr))) {
1928                                 return (0);
1929                         }
1930                 } else {
1931                         return (0);
1932                 }
1933                 break;
1934 #endif
1935         default:
1936                 return (0);
1937         }
1938         return (1);
1939 }
1940
1941 static struct mbuf *
1942 sctp_add_addr_to_mbuf(struct mbuf *m, struct sctp_ifa *ifa, uint16_t *len)
1943 {
1944 #if defined(INET) || defined(INET6)
1945         struct sctp_paramhdr *paramh;
1946         struct mbuf *mret;
1947         uint16_t plen;
1948 #endif
1949
1950         switch (ifa->address.sa.sa_family) {
1951 #ifdef INET
1952         case AF_INET:
1953                 plen = (uint16_t)sizeof(struct sctp_ipv4addr_param);
1954                 break;
1955 #endif
1956 #ifdef INET6
1957         case AF_INET6:
1958                 plen = (uint16_t)sizeof(struct sctp_ipv6addr_param);
1959                 break;
1960 #endif
1961         default:
1962                 return (m);
1963         }
1964 #if defined(INET) || defined(INET6)
1965         if (M_TRAILINGSPACE(m) >= plen) {
1966                 /* easy side we just drop it on the end */
1967                 paramh = (struct sctp_paramhdr *)(SCTP_BUF_AT(m, SCTP_BUF_LEN(m)));
1968                 mret = m;
1969         } else {
1970                 /* Need more space */
1971                 mret = m;
1972                 while (SCTP_BUF_NEXT(mret) != NULL) {
1973                         mret = SCTP_BUF_NEXT(mret);
1974                 }
1975                 SCTP_BUF_NEXT(mret) = sctp_get_mbuf_for_msg(plen, 0, M_NOWAIT, 1, MT_DATA);
1976                 if (SCTP_BUF_NEXT(mret) == NULL) {
1977                         /* We are hosed, can't add more addresses */
1978                         return (m);
1979                 }
1980                 mret = SCTP_BUF_NEXT(mret);
1981                 paramh = mtod(mret, struct sctp_paramhdr *);
1982         }
1983         /* now add the parameter */
1984         switch (ifa->address.sa.sa_family) {
1985 #ifdef INET
1986         case AF_INET:
1987                 {
1988                         struct sctp_ipv4addr_param *ipv4p;
1989                         struct sockaddr_in *sin;
1990
1991                         sin = &ifa->address.sin;
1992                         ipv4p = (struct sctp_ipv4addr_param *)paramh;
1993                         paramh->param_type = htons(SCTP_IPV4_ADDRESS);
1994                         paramh->param_length = htons(plen);
1995                         ipv4p->addr = sin->sin_addr.s_addr;
1996                         SCTP_BUF_LEN(mret) += plen;
1997                         break;
1998                 }
1999 #endif
2000 #ifdef INET6
2001         case AF_INET6:
2002                 {
2003                         struct sctp_ipv6addr_param *ipv6p;
2004                         struct sockaddr_in6 *sin6;
2005
2006                         sin6 = &ifa->address.sin6;
2007                         ipv6p = (struct sctp_ipv6addr_param *)paramh;
2008                         paramh->param_type = htons(SCTP_IPV6_ADDRESS);
2009                         paramh->param_length = htons(plen);
2010                         memcpy(ipv6p->addr, &sin6->sin6_addr,
2011                             sizeof(ipv6p->addr));
2012                         /* clear embedded scope in the address */
2013                         in6_clearscope((struct in6_addr *)ipv6p->addr);
2014                         SCTP_BUF_LEN(mret) += plen;
2015                         break;
2016                 }
2017 #endif
2018         default:
2019                 return (m);
2020         }
2021         if (len != NULL) {
2022                 *len += plen;
2023         }
2024         return (mret);
2025 #endif
2026 }
2027
2028
2029 struct mbuf *
2030 sctp_add_addresses_to_i_ia(struct sctp_inpcb *inp, struct sctp_tcb *stcb,
2031     struct sctp_scoping *scope,
2032     struct mbuf *m_at, int cnt_inits_to,
2033     uint16_t *padding_len, uint16_t *chunk_len)
2034 {
2035         struct sctp_vrf *vrf = NULL;
2036         int cnt, limit_out = 0, total_count;
2037         uint32_t vrf_id;
2038
2039         vrf_id = inp->def_vrf_id;
2040         SCTP_IPI_ADDR_RLOCK();
2041         vrf = sctp_find_vrf(vrf_id);
2042         if (vrf == NULL) {
2043                 SCTP_IPI_ADDR_RUNLOCK();
2044                 return (m_at);
2045         }
2046         if (inp->sctp_flags & SCTP_PCB_FLAGS_BOUNDALL) {
2047                 struct sctp_ifa *sctp_ifap;
2048                 struct sctp_ifn *sctp_ifnp;
2049
2050                 cnt = cnt_inits_to;
2051                 if (vrf->total_ifa_count > SCTP_COUNT_LIMIT) {
2052                         limit_out = 1;
2053                         cnt = SCTP_ADDRESS_LIMIT;
2054                         goto skip_count;
2055                 }
2056                 LIST_FOREACH(sctp_ifnp, &vrf->ifnlist, next_ifn) {
2057                         if ((scope->loopback_scope == 0) &&
2058                             SCTP_IFN_IS_IFT_LOOP(sctp_ifnp)) {
2059                                 /*
2060                                  * Skip loopback devices if loopback_scope
2061                                  * not set
2062                                  */
2063                                 continue;
2064                         }
2065                         LIST_FOREACH(sctp_ifap, &sctp_ifnp->ifalist, next_ifa) {
2066 #ifdef INET
2067                                 if ((sctp_ifap->address.sa.sa_family == AF_INET) &&
2068                                     (prison_check_ip4(inp->ip_inp.inp.inp_cred,
2069                                     &sctp_ifap->address.sin.sin_addr) != 0)) {
2070                                         continue;
2071                                 }
2072 #endif
2073 #ifdef INET6
2074                                 if ((sctp_ifap->address.sa.sa_family == AF_INET6) &&
2075                                     (prison_check_ip6(inp->ip_inp.inp.inp_cred,
2076                                     &sctp_ifap->address.sin6.sin6_addr) != 0)) {
2077                                         continue;
2078                                 }
2079 #endif
2080                                 if (sctp_is_addr_restricted(stcb, sctp_ifap)) {
2081                                         continue;
2082                                 }
2083                                 if (sctp_is_address_in_scope(sctp_ifap, scope, 1) == 0) {
2084                                         continue;
2085                                 }
2086                                 cnt++;
2087                                 if (cnt > SCTP_ADDRESS_LIMIT) {
2088                                         break;
2089                                 }
2090                         }
2091                         if (cnt > SCTP_ADDRESS_LIMIT) {
2092                                 break;
2093                         }
2094                 }
2095 skip_count:
2096                 if (cnt > 1) {
2097                         total_count = 0;
2098                         LIST_FOREACH(sctp_ifnp, &vrf->ifnlist, next_ifn) {
2099                                 cnt = 0;
2100                                 if ((scope->loopback_scope == 0) &&
2101                                     SCTP_IFN_IS_IFT_LOOP(sctp_ifnp)) {
2102                                         /*
2103                                          * Skip loopback devices if
2104                                          * loopback_scope not set
2105                                          */
2106                                         continue;
2107                                 }
2108                                 LIST_FOREACH(sctp_ifap, &sctp_ifnp->ifalist, next_ifa) {
2109 #ifdef INET
2110                                         if ((sctp_ifap->address.sa.sa_family == AF_INET) &&
2111                                             (prison_check_ip4(inp->ip_inp.inp.inp_cred,
2112                                             &sctp_ifap->address.sin.sin_addr) != 0)) {
2113                                                 continue;
2114                                         }
2115 #endif
2116 #ifdef INET6
2117                                         if ((sctp_ifap->address.sa.sa_family == AF_INET6) &&
2118                                             (prison_check_ip6(inp->ip_inp.inp.inp_cred,
2119                                             &sctp_ifap->address.sin6.sin6_addr) != 0)) {
2120                                                 continue;
2121                                         }
2122 #endif
2123                                         if (sctp_is_addr_restricted(stcb, sctp_ifap)) {
2124                                                 continue;
2125                                         }
2126                                         if (sctp_is_address_in_scope(sctp_ifap,
2127                                             scope, 0) == 0) {
2128                                                 continue;
2129                                         }
2130                                         if ((chunk_len != NULL) &&
2131                                             (padding_len != NULL) &&
2132                                             (*padding_len > 0)) {
2133                                                 memset(mtod(m_at, caddr_t)+*chunk_len, 0, *padding_len);
2134                                                 SCTP_BUF_LEN(m_at) += *padding_len;
2135                                                 *chunk_len += *padding_len;
2136                                                 *padding_len = 0;
2137                                         }
2138                                         m_at = sctp_add_addr_to_mbuf(m_at, sctp_ifap, chunk_len);
2139                                         if (limit_out) {
2140                                                 cnt++;
2141                                                 total_count++;
2142                                                 if (cnt >= 2) {
2143                                                         /*
2144                                                          * two from each
2145                                                          * address
2146                                                          */
2147                                                         break;
2148                                                 }
2149                                                 if (total_count > SCTP_ADDRESS_LIMIT) {
2150                                                         /* No more addresses */
2151                                                         break;
2152                                                 }
2153                                         }
2154                                 }
2155                         }
2156                 }
2157         } else {
2158                 struct sctp_laddr *laddr;
2159
2160                 cnt = cnt_inits_to;
2161                 /* First, how many ? */
2162                 LIST_FOREACH(laddr, &inp->sctp_addr_list, sctp_nxt_addr) {
2163                         if (laddr->ifa == NULL) {
2164                                 continue;
2165                         }
2166                         if (laddr->ifa->localifa_flags & SCTP_BEING_DELETED)
2167                                 /*
2168                                  * Address being deleted by the system, dont
2169                                  * list.
2170                                  */
2171                                 continue;
2172                         if (laddr->action == SCTP_DEL_IP_ADDRESS) {
2173                                 /*
2174                                  * Address being deleted on this ep don't
2175                                  * list.
2176                                  */
2177                                 continue;
2178                         }
2179                         if (sctp_is_address_in_scope(laddr->ifa,
2180                             scope, 1) == 0) {
2181                                 continue;
2182                         }
2183                         cnt++;
2184                 }
2185                 /*
2186                  * To get through a NAT we only list addresses if we have
2187                  * more than one. That way if you just bind a single address
2188                  * we let the source of the init dictate our address.
2189                  */
2190                 if (cnt > 1) {
2191                         cnt = cnt_inits_to;
2192                         LIST_FOREACH(laddr, &inp->sctp_addr_list, sctp_nxt_addr) {
2193                                 if (laddr->ifa == NULL) {
2194                                         continue;
2195                                 }
2196                                 if (laddr->ifa->localifa_flags & SCTP_BEING_DELETED) {
2197                                         continue;
2198                                 }
2199                                 if (sctp_is_address_in_scope(laddr->ifa,
2200                                     scope, 0) == 0) {
2201                                         continue;
2202                                 }
2203                                 if ((chunk_len != NULL) &&
2204                                     (padding_len != NULL) &&
2205                                     (*padding_len > 0)) {
2206                                         memset(mtod(m_at, caddr_t)+*chunk_len, 0, *padding_len);
2207                                         SCTP_BUF_LEN(m_at) += *padding_len;
2208                                         *chunk_len += *padding_len;
2209                                         *padding_len = 0;
2210                                 }
2211                                 m_at = sctp_add_addr_to_mbuf(m_at, laddr->ifa, chunk_len);
2212                                 cnt++;
2213                                 if (cnt >= SCTP_ADDRESS_LIMIT) {
2214                                         break;
2215                                 }
2216                         }
2217                 }
2218         }
2219         SCTP_IPI_ADDR_RUNLOCK();
2220         return (m_at);
2221 }
2222
2223 static struct sctp_ifa *
2224 sctp_is_ifa_addr_preferred(struct sctp_ifa *ifa,
2225     uint8_t dest_is_loop,
2226     uint8_t dest_is_priv,
2227     sa_family_t fam)
2228 {
2229         uint8_t dest_is_global = 0;
2230
2231         /* dest_is_priv is true if destination is a private address */
2232         /* dest_is_loop is true if destination is a loopback addresses */
2233
2234         /**
2235          * Here we determine if its a preferred address. A preferred address
2236          * means it is the same scope or higher scope then the destination.
2237          * L = loopback, P = private, G = global
2238          * -----------------------------------------
2239          *    src    |  dest | result
2240          *  ----------------------------------------
2241          *     L     |    L  |    yes
2242          *  -----------------------------------------
2243          *     P     |    L  |    yes-v4 no-v6
2244          *  -----------------------------------------
2245          *     G     |    L  |    yes-v4 no-v6
2246          *  -----------------------------------------
2247          *     L     |    P  |    no
2248          *  -----------------------------------------
2249          *     P     |    P  |    yes
2250          *  -----------------------------------------
2251          *     G     |    P  |    no
2252          *   -----------------------------------------
2253          *     L     |    G  |    no
2254          *   -----------------------------------------
2255          *     P     |    G  |    no
2256          *    -----------------------------------------
2257          *     G     |    G  |    yes
2258          *    -----------------------------------------
2259          */
2260
2261         if (ifa->address.sa.sa_family != fam) {
2262                 /* forget mis-matched family */
2263                 return (NULL);
2264         }
2265         if ((dest_is_priv == 0) && (dest_is_loop == 0)) {
2266                 dest_is_global = 1;
2267         }
2268         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Is destination preferred:");
2269         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, &ifa->address.sa);
2270         /* Ok the address may be ok */
2271 #ifdef INET6
2272         if (fam == AF_INET6) {
2273                 /* ok to use deprecated addresses? no lets not! */
2274                 if (ifa->localifa_flags & SCTP_ADDR_IFA_UNUSEABLE) {
2275                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:1\n");
2276                         return (NULL);
2277                 }
2278                 if (ifa->src_is_priv && !ifa->src_is_loop) {
2279                         if (dest_is_loop) {
2280                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:2\n");
2281                                 return (NULL);
2282                         }
2283                 }
2284                 if (ifa->src_is_glob) {
2285                         if (dest_is_loop) {
2286                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:3\n");
2287                                 return (NULL);
2288                         }
2289                 }
2290         }
2291 #endif
2292         /*
2293          * Now that we know what is what, implement or table this could in
2294          * theory be done slicker (it used to be), but this is
2295          * straightforward and easier to validate :-)
2296          */
2297         SCTPDBG(SCTP_DEBUG_OUTPUT3, "src_loop:%d src_priv:%d src_glob:%d\n",
2298             ifa->src_is_loop, ifa->src_is_priv, ifa->src_is_glob);
2299         SCTPDBG(SCTP_DEBUG_OUTPUT3, "dest_loop:%d dest_priv:%d dest_glob:%d\n",
2300             dest_is_loop, dest_is_priv, dest_is_global);
2301
2302         if ((ifa->src_is_loop) && (dest_is_priv)) {
2303                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:4\n");
2304                 return (NULL);
2305         }
2306         if ((ifa->src_is_glob) && (dest_is_priv)) {
2307                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:5\n");
2308                 return (NULL);
2309         }
2310         if ((ifa->src_is_loop) && (dest_is_global)) {
2311                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:6\n");
2312                 return (NULL);
2313         }
2314         if ((ifa->src_is_priv) && (dest_is_global)) {
2315                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:7\n");
2316                 return (NULL);
2317         }
2318         SCTPDBG(SCTP_DEBUG_OUTPUT3, "YES\n");
2319         /* its a preferred address */
2320         return (ifa);
2321 }
2322
2323 static struct sctp_ifa *
2324 sctp_is_ifa_addr_acceptable(struct sctp_ifa *ifa,
2325     uint8_t dest_is_loop,
2326     uint8_t dest_is_priv,
2327     sa_family_t fam)
2328 {
2329         uint8_t dest_is_global = 0;
2330
2331         /**
2332          * Here we determine if its a acceptable address. A acceptable
2333          * address means it is the same scope or higher scope but we can
2334          * allow for NAT which means its ok to have a global dest and a
2335          * private src.
2336          *
2337          * L = loopback, P = private, G = global
2338          * -----------------------------------------
2339          *  src    |  dest | result
2340          * -----------------------------------------
2341          *   L     |   L   |    yes
2342          *  -----------------------------------------
2343          *   P     |   L   |    yes-v4 no-v6
2344          *  -----------------------------------------
2345          *   G     |   L   |    yes
2346          * -----------------------------------------
2347          *   L     |   P   |    no
2348          * -----------------------------------------
2349          *   P     |   P   |    yes
2350          * -----------------------------------------
2351          *   G     |   P   |    yes - May not work
2352          * -----------------------------------------
2353          *   L     |   G   |    no
2354          * -----------------------------------------
2355          *   P     |   G   |    yes - May not work
2356          * -----------------------------------------
2357          *   G     |   G   |    yes
2358          * -----------------------------------------
2359          */
2360
2361         if (ifa->address.sa.sa_family != fam) {
2362                 /* forget non matching family */
2363                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "ifa_fam:%d fam:%d\n",
2364                     ifa->address.sa.sa_family, fam);
2365                 return (NULL);
2366         }
2367         /* Ok the address may be ok */
2368         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT3, &ifa->address.sa);
2369         SCTPDBG(SCTP_DEBUG_OUTPUT3, "dst_is_loop:%d dest_is_priv:%d\n",
2370             dest_is_loop, dest_is_priv);
2371         if ((dest_is_loop == 0) && (dest_is_priv == 0)) {
2372                 dest_is_global = 1;
2373         }
2374 #ifdef INET6
2375         if (fam == AF_INET6) {
2376                 /* ok to use deprecated addresses? */
2377                 if (ifa->localifa_flags & SCTP_ADDR_IFA_UNUSEABLE) {
2378                         return (NULL);
2379                 }
2380                 if (ifa->src_is_priv) {
2381                         /* Special case, linklocal to loop */
2382                         if (dest_is_loop)
2383                                 return (NULL);
2384                 }
2385         }
2386 #endif
2387         /*
2388          * Now that we know what is what, implement our table. This could in
2389          * theory be done slicker (it used to be), but this is
2390          * straightforward and easier to validate :-)
2391          */
2392         SCTPDBG(SCTP_DEBUG_OUTPUT3, "ifa->src_is_loop:%d dest_is_priv:%d\n",
2393             ifa->src_is_loop,
2394             dest_is_priv);
2395         if ((ifa->src_is_loop == 1) && (dest_is_priv)) {
2396                 return (NULL);
2397         }
2398         SCTPDBG(SCTP_DEBUG_OUTPUT3, "ifa->src_is_loop:%d dest_is_glob:%d\n",
2399             ifa->src_is_loop,
2400             dest_is_global);
2401         if ((ifa->src_is_loop == 1) && (dest_is_global)) {
2402                 return (NULL);
2403         }
2404         SCTPDBG(SCTP_DEBUG_OUTPUT3, "address is acceptable\n");
2405         /* its an acceptable address */
2406         return (ifa);
2407 }
2408
2409 int
2410 sctp_is_addr_restricted(struct sctp_tcb *stcb, struct sctp_ifa *ifa)
2411 {
2412         struct sctp_laddr *laddr;
2413
2414         if (stcb == NULL) {
2415                 /* There are no restrictions, no TCB :-) */
2416                 return (0);
2417         }
2418         LIST_FOREACH(laddr, &stcb->asoc.sctp_restricted_addrs, sctp_nxt_addr) {
2419                 if (laddr->ifa == NULL) {
2420                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "%s: NULL ifa\n",
2421                             __func__);
2422                         continue;
2423                 }
2424                 if (laddr->ifa == ifa) {
2425                         /* Yes it is on the list */
2426                         return (1);
2427                 }
2428         }
2429         return (0);
2430 }
2431
2432
2433 int
2434 sctp_is_addr_in_ep(struct sctp_inpcb *inp, struct sctp_ifa *ifa)
2435 {
2436         struct sctp_laddr *laddr;
2437
2438         if (ifa == NULL)
2439                 return (0);
2440         LIST_FOREACH(laddr, &inp->sctp_addr_list, sctp_nxt_addr) {
2441                 if (laddr->ifa == NULL) {
2442                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "%s: NULL ifa\n",
2443                             __func__);
2444                         continue;
2445                 }
2446                 if ((laddr->ifa == ifa) && laddr->action == 0)
2447                         /* same pointer */
2448                         return (1);
2449         }
2450         return (0);
2451 }
2452
2453
2454
2455 static struct sctp_ifa *
2456 sctp_choose_boundspecific_inp(struct sctp_inpcb *inp,
2457     sctp_route_t *ro,
2458     uint32_t vrf_id,
2459     int non_asoc_addr_ok,
2460     uint8_t dest_is_priv,
2461     uint8_t dest_is_loop,
2462     sa_family_t fam)
2463 {
2464         struct sctp_laddr *laddr, *starting_point;
2465         void *ifn;
2466         int resettotop = 0;
2467         struct sctp_ifn *sctp_ifn;
2468         struct sctp_ifa *sctp_ifa, *sifa;
2469         struct sctp_vrf *vrf;
2470         uint32_t ifn_index;
2471
2472         vrf = sctp_find_vrf(vrf_id);
2473         if (vrf == NULL)
2474                 return (NULL);
2475
2476         ifn = SCTP_GET_IFN_VOID_FROM_ROUTE(ro);
2477         ifn_index = SCTP_GET_IF_INDEX_FROM_ROUTE(ro);
2478         sctp_ifn = sctp_find_ifn(ifn, ifn_index);
2479         /*
2480          * first question, is the ifn we will emit on in our list, if so, we
2481          * want such an address. Note that we first looked for a preferred
2482          * address.
2483          */
2484         if (sctp_ifn) {
2485                 /* is a preferred one on the interface we route out? */
2486                 LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
2487 #ifdef INET
2488                         if ((sctp_ifa->address.sa.sa_family == AF_INET) &&
2489                             (prison_check_ip4(inp->ip_inp.inp.inp_cred,
2490                             &sctp_ifa->address.sin.sin_addr) != 0)) {
2491                                 continue;
2492                         }
2493 #endif
2494 #ifdef INET6
2495                         if ((sctp_ifa->address.sa.sa_family == AF_INET6) &&
2496                             (prison_check_ip6(inp->ip_inp.inp.inp_cred,
2497                             &sctp_ifa->address.sin6.sin6_addr) != 0)) {
2498                                 continue;
2499                         }
2500 #endif
2501                         if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
2502                             (non_asoc_addr_ok == 0))
2503                                 continue;
2504                         sifa = sctp_is_ifa_addr_preferred(sctp_ifa,
2505                             dest_is_loop,
2506                             dest_is_priv, fam);
2507                         if (sifa == NULL)
2508                                 continue;
2509                         if (sctp_is_addr_in_ep(inp, sifa)) {
2510                                 atomic_add_int(&sifa->refcount, 1);
2511                                 return (sifa);
2512                         }
2513                 }
2514         }
2515         /*
2516          * ok, now we now need to find one on the list of the addresses. We
2517          * can't get one on the emitting interface so let's find first a
2518          * preferred one. If not that an acceptable one otherwise... we
2519          * return NULL.
2520          */
2521         starting_point = inp->next_addr_touse;
2522 once_again:
2523         if (inp->next_addr_touse == NULL) {
2524                 inp->next_addr_touse = LIST_FIRST(&inp->sctp_addr_list);
2525                 resettotop = 1;
2526         }
2527         for (laddr = inp->next_addr_touse; laddr;
2528             laddr = LIST_NEXT(laddr, sctp_nxt_addr)) {
2529                 if (laddr->ifa == NULL) {
2530                         /* address has been removed */
2531                         continue;
2532                 }
2533                 if (laddr->action == SCTP_DEL_IP_ADDRESS) {
2534                         /* address is being deleted */
2535                         continue;
2536                 }
2537                 sifa = sctp_is_ifa_addr_preferred(laddr->ifa, dest_is_loop,
2538                     dest_is_priv, fam);
2539                 if (sifa == NULL)
2540                         continue;
2541                 atomic_add_int(&sifa->refcount, 1);
2542                 return (sifa);
2543         }
2544         if (resettotop == 0) {
2545                 inp->next_addr_touse = NULL;
2546                 goto once_again;
2547         }
2548
2549         inp->next_addr_touse = starting_point;
2550         resettotop = 0;
2551 once_again_too:
2552         if (inp->next_addr_touse == NULL) {
2553                 inp->next_addr_touse = LIST_FIRST(&inp->sctp_addr_list);
2554                 resettotop = 1;
2555         }
2556
2557         /* ok, what about an acceptable address in the inp */
2558         for (laddr = inp->next_addr_touse; laddr;
2559             laddr = LIST_NEXT(laddr, sctp_nxt_addr)) {
2560                 if (laddr->ifa == NULL) {
2561                         /* address has been removed */
2562                         continue;
2563                 }
2564                 if (laddr->action == SCTP_DEL_IP_ADDRESS) {
2565                         /* address is being deleted */
2566                         continue;
2567                 }
2568                 sifa = sctp_is_ifa_addr_acceptable(laddr->ifa, dest_is_loop,
2569                     dest_is_priv, fam);
2570                 if (sifa == NULL)
2571                         continue;
2572                 atomic_add_int(&sifa->refcount, 1);
2573                 return (sifa);
2574         }
2575         if (resettotop == 0) {
2576                 inp->next_addr_touse = NULL;
2577                 goto once_again_too;
2578         }
2579
2580         /*
2581          * no address bound can be a source for the destination we are in
2582          * trouble
2583          */
2584         return (NULL);
2585 }
2586
2587
2588
2589 static struct sctp_ifa *
2590 sctp_choose_boundspecific_stcb(struct sctp_inpcb *inp,
2591     struct sctp_tcb *stcb,
2592     sctp_route_t *ro,
2593     uint32_t vrf_id,
2594     uint8_t dest_is_priv,
2595     uint8_t dest_is_loop,
2596     int non_asoc_addr_ok,
2597     sa_family_t fam)
2598 {
2599         struct sctp_laddr *laddr, *starting_point;
2600         void *ifn;
2601         struct sctp_ifn *sctp_ifn;
2602         struct sctp_ifa *sctp_ifa, *sifa;
2603         uint8_t start_at_beginning = 0;
2604         struct sctp_vrf *vrf;
2605         uint32_t ifn_index;
2606
2607         /*
2608          * first question, is the ifn we will emit on in our list, if so, we
2609          * want that one.
2610          */
2611         vrf = sctp_find_vrf(vrf_id);
2612         if (vrf == NULL)
2613                 return (NULL);
2614
2615         ifn = SCTP_GET_IFN_VOID_FROM_ROUTE(ro);
2616         ifn_index = SCTP_GET_IF_INDEX_FROM_ROUTE(ro);
2617         sctp_ifn = sctp_find_ifn(ifn, ifn_index);
2618
2619         /*
2620          * first question, is the ifn we will emit on in our list?  If so,
2621          * we want that one. First we look for a preferred. Second, we go
2622          * for an acceptable.
2623          */
2624         if (sctp_ifn) {
2625                 /* first try for a preferred address on the ep */
2626                 LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
2627 #ifdef INET
2628                         if ((sctp_ifa->address.sa.sa_family == AF_INET) &&
2629                             (prison_check_ip4(inp->ip_inp.inp.inp_cred,
2630                             &sctp_ifa->address.sin.sin_addr) != 0)) {
2631                                 continue;
2632                         }
2633 #endif
2634 #ifdef INET6
2635                         if ((sctp_ifa->address.sa.sa_family == AF_INET6) &&
2636                             (prison_check_ip6(inp->ip_inp.inp.inp_cred,
2637                             &sctp_ifa->address.sin6.sin6_addr) != 0)) {
2638                                 continue;
2639                         }
2640 #endif
2641                         if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) && (non_asoc_addr_ok == 0))
2642                                 continue;
2643                         if (sctp_is_addr_in_ep(inp, sctp_ifa)) {
2644                                 sifa = sctp_is_ifa_addr_preferred(sctp_ifa, dest_is_loop, dest_is_priv, fam);
2645                                 if (sifa == NULL)
2646                                         continue;
2647                                 if (((non_asoc_addr_ok == 0) &&
2648                                     (sctp_is_addr_restricted(stcb, sifa))) ||
2649                                     (non_asoc_addr_ok &&
2650                                     (sctp_is_addr_restricted(stcb, sifa)) &&
2651                                     (!sctp_is_addr_pending(stcb, sifa)))) {
2652                                         /* on the no-no list */
2653                                         continue;
2654                                 }
2655                                 atomic_add_int(&sifa->refcount, 1);
2656                                 return (sifa);
2657                         }
2658                 }
2659                 /* next try for an acceptable address on the ep */
2660                 LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
2661 #ifdef INET
2662                         if ((sctp_ifa->address.sa.sa_family == AF_INET) &&
2663                             (prison_check_ip4(inp->ip_inp.inp.inp_cred,
2664                             &sctp_ifa->address.sin.sin_addr) != 0)) {
2665                                 continue;
2666                         }
2667 #endif
2668 #ifdef INET6
2669                         if ((sctp_ifa->address.sa.sa_family == AF_INET6) &&
2670                             (prison_check_ip6(inp->ip_inp.inp.inp_cred,
2671                             &sctp_ifa->address.sin6.sin6_addr) != 0)) {
2672                                 continue;
2673                         }
2674 #endif
2675                         if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) && (non_asoc_addr_ok == 0))
2676                                 continue;
2677                         if (sctp_is_addr_in_ep(inp, sctp_ifa)) {
2678                                 sifa = sctp_is_ifa_addr_acceptable(sctp_ifa, dest_is_loop, dest_is_priv, fam);
2679                                 if (sifa == NULL)
2680                                         continue;
2681                                 if (((non_asoc_addr_ok == 0) &&
2682                                     (sctp_is_addr_restricted(stcb, sifa))) ||
2683                                     (non_asoc_addr_ok &&
2684                                     (sctp_is_addr_restricted(stcb, sifa)) &&
2685                                     (!sctp_is_addr_pending(stcb, sifa)))) {
2686                                         /* on the no-no list */
2687                                         continue;
2688                                 }
2689                                 atomic_add_int(&sifa->refcount, 1);
2690                                 return (sifa);
2691                         }
2692                 }
2693
2694         }
2695         /*
2696          * if we can't find one like that then we must look at all addresses
2697          * bound to pick one at first preferable then secondly acceptable.
2698          */
2699         starting_point = stcb->asoc.last_used_address;
2700 sctp_from_the_top:
2701         if (stcb->asoc.last_used_address == NULL) {
2702                 start_at_beginning = 1;
2703                 stcb->asoc.last_used_address = LIST_FIRST(&inp->sctp_addr_list);
2704         }
2705         /* search beginning with the last used address */
2706         for (laddr = stcb->asoc.last_used_address; laddr;
2707             laddr = LIST_NEXT(laddr, sctp_nxt_addr)) {
2708                 if (laddr->ifa == NULL) {
2709                         /* address has been removed */
2710                         continue;
2711                 }
2712                 if (laddr->action == SCTP_DEL_IP_ADDRESS) {
2713                         /* address is being deleted */
2714                         continue;
2715                 }
2716                 sifa = sctp_is_ifa_addr_preferred(laddr->ifa, dest_is_loop, dest_is_priv, fam);
2717                 if (sifa == NULL)
2718                         continue;
2719                 if (((non_asoc_addr_ok == 0) &&
2720                     (sctp_is_addr_restricted(stcb, sifa))) ||
2721                     (non_asoc_addr_ok &&
2722                     (sctp_is_addr_restricted(stcb, sifa)) &&
2723                     (!sctp_is_addr_pending(stcb, sifa)))) {
2724                         /* on the no-no list */
2725                         continue;
2726                 }
2727                 stcb->asoc.last_used_address = laddr;
2728                 atomic_add_int(&sifa->refcount, 1);
2729                 return (sifa);
2730         }
2731         if (start_at_beginning == 0) {
2732                 stcb->asoc.last_used_address = NULL;
2733                 goto sctp_from_the_top;
2734         }
2735         /* now try for any higher scope than the destination */
2736         stcb->asoc.last_used_address = starting_point;
2737         start_at_beginning = 0;
2738 sctp_from_the_top2:
2739         if (stcb->asoc.last_used_address == NULL) {
2740                 start_at_beginning = 1;
2741                 stcb->asoc.last_used_address = LIST_FIRST(&inp->sctp_addr_list);
2742         }
2743         /* search beginning with the last used address */
2744         for (laddr = stcb->asoc.last_used_address; laddr;
2745             laddr = LIST_NEXT(laddr, sctp_nxt_addr)) {
2746                 if (laddr->ifa == NULL) {
2747                         /* address has been removed */
2748                         continue;
2749                 }
2750                 if (laddr->action == SCTP_DEL_IP_ADDRESS) {
2751                         /* address is being deleted */
2752                         continue;
2753                 }
2754                 sifa = sctp_is_ifa_addr_acceptable(laddr->ifa, dest_is_loop,
2755                     dest_is_priv, fam);
2756                 if (sifa == NULL)
2757                         continue;
2758                 if (((non_asoc_addr_ok == 0) &&
2759                     (sctp_is_addr_restricted(stcb, sifa))) ||
2760                     (non_asoc_addr_ok &&
2761                     (sctp_is_addr_restricted(stcb, sifa)) &&
2762                     (!sctp_is_addr_pending(stcb, sifa)))) {
2763                         /* on the no-no list */
2764                         continue;
2765                 }
2766                 stcb->asoc.last_used_address = laddr;
2767                 atomic_add_int(&sifa->refcount, 1);
2768                 return (sifa);
2769         }
2770         if (start_at_beginning == 0) {
2771                 stcb->asoc.last_used_address = NULL;
2772                 goto sctp_from_the_top2;
2773         }
2774         return (NULL);
2775 }
2776
2777 static struct sctp_ifa *
2778 sctp_select_nth_preferred_addr_from_ifn_boundall(struct sctp_ifn *ifn,
2779     struct sctp_inpcb *inp,
2780     struct sctp_tcb *stcb,
2781     int non_asoc_addr_ok,
2782     uint8_t dest_is_loop,
2783     uint8_t dest_is_priv,
2784     int addr_wanted,
2785     sa_family_t fam,
2786     sctp_route_t *ro)
2787 {
2788         struct sctp_ifa *ifa, *sifa;
2789         int num_eligible_addr = 0;
2790 #ifdef INET6
2791         struct sockaddr_in6 sin6, lsa6;
2792
2793         if (fam == AF_INET6) {
2794                 memcpy(&sin6, &ro->ro_dst, sizeof(struct sockaddr_in6));
2795                 (void)sa6_recoverscope(&sin6);
2796         }
2797 #endif                          /* INET6 */
2798         LIST_FOREACH(ifa, &ifn->ifalist, next_ifa) {
2799 #ifdef INET
2800                 if ((ifa->address.sa.sa_family == AF_INET) &&
2801                     (prison_check_ip4(inp->ip_inp.inp.inp_cred,
2802                     &ifa->address.sin.sin_addr) != 0)) {
2803                         continue;
2804                 }
2805 #endif
2806 #ifdef INET6
2807                 if ((ifa->address.sa.sa_family == AF_INET6) &&
2808                     (prison_check_ip6(inp->ip_inp.inp.inp_cred,
2809                     &ifa->address.sin6.sin6_addr) != 0)) {
2810                         continue;
2811                 }
2812 #endif
2813                 if ((ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
2814                     (non_asoc_addr_ok == 0))
2815                         continue;
2816                 sifa = sctp_is_ifa_addr_preferred(ifa, dest_is_loop,
2817                     dest_is_priv, fam);
2818                 if (sifa == NULL)
2819                         continue;
2820 #ifdef INET6
2821                 if (fam == AF_INET6 &&
2822                     dest_is_loop &&
2823                     sifa->src_is_loop && sifa->src_is_priv) {
2824                         /*
2825                          * don't allow fe80::1 to be a src on loop ::1, we
2826                          * don't list it to the peer so we will get an
2827                          * abort.
2828                          */
2829                         continue;
2830                 }
2831                 if (fam == AF_INET6 &&
2832                     IN6_IS_ADDR_LINKLOCAL(&sifa->address.sin6.sin6_addr) &&
2833                     IN6_IS_ADDR_LINKLOCAL(&sin6.sin6_addr)) {
2834                         /*
2835                          * link-local <-> link-local must belong to the same
2836                          * scope.
2837                          */
2838                         memcpy(&lsa6, &sifa->address.sin6, sizeof(struct sockaddr_in6));
2839                         (void)sa6_recoverscope(&lsa6);
2840                         if (sin6.sin6_scope_id != lsa6.sin6_scope_id) {
2841                                 continue;
2842                         }
2843                 }
2844 #endif                          /* INET6 */
2845
2846                 /*
2847                  * Check if the IPv6 address matches to next-hop. In the
2848                  * mobile case, old IPv6 address may be not deleted from the
2849                  * interface. Then, the interface has previous and new
2850                  * addresses.  We should use one corresponding to the
2851                  * next-hop.  (by micchie)
2852                  */
2853 #ifdef INET6
2854                 if (stcb && fam == AF_INET6 &&
2855                     sctp_is_mobility_feature_on(stcb->sctp_ep, SCTP_MOBILITY_BASE)) {
2856                         if (sctp_v6src_match_nexthop(&sifa->address.sin6, ro)
2857                             == 0) {
2858                                 continue;
2859                         }
2860                 }
2861 #endif
2862 #ifdef INET
2863                 /* Avoid topologically incorrect IPv4 address */
2864                 if (stcb && fam == AF_INET &&
2865                     sctp_is_mobility_feature_on(stcb->sctp_ep, SCTP_MOBILITY_BASE)) {
2866                         if (sctp_v4src_match_nexthop(sifa, ro) == 0) {
2867                                 continue;
2868                         }
2869                 }
2870 #endif
2871                 if (stcb) {
2872                         if (sctp_is_address_in_scope(ifa, &stcb->asoc.scope, 0) == 0) {
2873                                 continue;
2874                         }
2875                         if (((non_asoc_addr_ok == 0) &&
2876                             (sctp_is_addr_restricted(stcb, sifa))) ||
2877                             (non_asoc_addr_ok &&
2878                             (sctp_is_addr_restricted(stcb, sifa)) &&
2879                             (!sctp_is_addr_pending(stcb, sifa)))) {
2880                                 /*
2881                                  * It is restricted for some reason..
2882                                  * probably not yet added.
2883                                  */
2884                                 continue;
2885                         }
2886                 }
2887                 if (num_eligible_addr >= addr_wanted) {
2888                         return (sifa);
2889                 }
2890                 num_eligible_addr++;
2891         }
2892         return (NULL);
2893 }
2894
2895
2896 static int
2897 sctp_count_num_preferred_boundall(struct sctp_ifn *ifn,
2898     struct sctp_inpcb *inp,
2899     struct sctp_tcb *stcb,
2900     int non_asoc_addr_ok,
2901     uint8_t dest_is_loop,
2902     uint8_t dest_is_priv,
2903     sa_family_t fam)
2904 {
2905         struct sctp_ifa *ifa, *sifa;
2906         int num_eligible_addr = 0;
2907
2908         LIST_FOREACH(ifa, &ifn->ifalist, next_ifa) {
2909 #ifdef INET
2910                 if ((ifa->address.sa.sa_family == AF_INET) &&
2911                     (prison_check_ip4(inp->ip_inp.inp.inp_cred,
2912                     &ifa->address.sin.sin_addr) != 0)) {
2913                         continue;
2914                 }
2915 #endif
2916 #ifdef INET6
2917                 if ((ifa->address.sa.sa_family == AF_INET6) &&
2918                     (stcb != NULL) &&
2919                     (prison_check_ip6(inp->ip_inp.inp.inp_cred,
2920                     &ifa->address.sin6.sin6_addr) != 0)) {
2921                         continue;
2922                 }
2923 #endif
2924                 if ((ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
2925                     (non_asoc_addr_ok == 0)) {
2926                         continue;
2927                 }
2928                 sifa = sctp_is_ifa_addr_preferred(ifa, dest_is_loop,
2929                     dest_is_priv, fam);
2930                 if (sifa == NULL) {
2931                         continue;
2932                 }
2933                 if (stcb) {
2934                         if (sctp_is_address_in_scope(ifa, &stcb->asoc.scope, 0) == 0) {
2935                                 continue;
2936                         }
2937                         if (((non_asoc_addr_ok == 0) &&
2938                             (sctp_is_addr_restricted(stcb, sifa))) ||
2939                             (non_asoc_addr_ok &&
2940                             (sctp_is_addr_restricted(stcb, sifa)) &&
2941                             (!sctp_is_addr_pending(stcb, sifa)))) {
2942                                 /*
2943                                  * It is restricted for some reason..
2944                                  * probably not yet added.
2945                                  */
2946                                 continue;
2947                         }
2948                 }
2949                 num_eligible_addr++;
2950         }
2951         return (num_eligible_addr);
2952 }
2953
2954 static struct sctp_ifa *
2955 sctp_choose_boundall(struct sctp_inpcb *inp,
2956     struct sctp_tcb *stcb,
2957     struct sctp_nets *net,
2958     sctp_route_t *ro,
2959     uint32_t vrf_id,
2960     uint8_t dest_is_priv,
2961     uint8_t dest_is_loop,
2962     int non_asoc_addr_ok,
2963     sa_family_t fam)
2964 {
2965         int cur_addr_num = 0, num_preferred = 0;
2966         void *ifn;
2967         struct sctp_ifn *sctp_ifn, *looked_at = NULL, *emit_ifn;
2968         struct sctp_ifa *sctp_ifa, *sifa;
2969         uint32_t ifn_index;
2970         struct sctp_vrf *vrf;
2971 #ifdef INET
2972         int retried = 0;
2973 #endif
2974
2975         /*-
2976          * For boundall we can use any address in the association.
2977          * If non_asoc_addr_ok is set we can use any address (at least in
2978          * theory). So we look for preferred addresses first. If we find one,
2979          * we use it. Otherwise we next try to get an address on the
2980          * interface, which we should be able to do (unless non_asoc_addr_ok
2981          * is false and we are routed out that way). In these cases where we
2982          * can't use the address of the interface we go through all the
2983          * ifn's looking for an address we can use and fill that in. Punting
2984          * means we send back address 0, which will probably cause problems
2985          * actually since then IP will fill in the address of the route ifn,
2986          * which means we probably already rejected it.. i.e. here comes an
2987          * abort :-<.
2988          */
2989         vrf = sctp_find_vrf(vrf_id);
2990         if (vrf == NULL)
2991                 return (NULL);
2992
2993         ifn = SCTP_GET_IFN_VOID_FROM_ROUTE(ro);
2994         ifn_index = SCTP_GET_IF_INDEX_FROM_ROUTE(ro);
2995         SCTPDBG(SCTP_DEBUG_OUTPUT2, "ifn from route:%p ifn_index:%d\n", ifn, ifn_index);
2996         emit_ifn = looked_at = sctp_ifn = sctp_find_ifn(ifn, ifn_index);
2997         if (sctp_ifn == NULL) {
2998                 /* ?? We don't have this guy ?? */
2999                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "No ifn emit interface?\n");
3000                 goto bound_all_plan_b;
3001         }
3002         SCTPDBG(SCTP_DEBUG_OUTPUT2, "ifn_index:%d name:%s is emit interface\n",
3003             ifn_index, sctp_ifn->ifn_name);
3004
3005         if (net) {
3006                 cur_addr_num = net->indx_of_eligible_next_to_use;
3007         }
3008         num_preferred = sctp_count_num_preferred_boundall(sctp_ifn,
3009             inp, stcb,
3010             non_asoc_addr_ok,
3011             dest_is_loop,
3012             dest_is_priv, fam);
3013         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Found %d preferred source addresses for intf:%s\n",
3014             num_preferred, sctp_ifn->ifn_name);
3015         if (num_preferred == 0) {
3016                 /*
3017                  * no eligible addresses, we must use some other interface
3018                  * address if we can find one.
3019                  */
3020                 goto bound_all_plan_b;
3021         }
3022         /*
3023          * Ok we have num_eligible_addr set with how many we can use, this
3024          * may vary from call to call due to addresses being deprecated
3025          * etc..
3026          */
3027         if (cur_addr_num >= num_preferred) {
3028                 cur_addr_num = 0;
3029         }
3030         /*
3031          * select the nth address from the list (where cur_addr_num is the
3032          * nth) and 0 is the first one, 1 is the second one etc...
3033          */
3034         SCTPDBG(SCTP_DEBUG_OUTPUT2, "cur_addr_num:%d\n", cur_addr_num);
3035
3036         sctp_ifa = sctp_select_nth_preferred_addr_from_ifn_boundall(sctp_ifn, inp, stcb, non_asoc_addr_ok, dest_is_loop,
3037             dest_is_priv, cur_addr_num, fam, ro);
3038
3039         /* if sctp_ifa is NULL something changed??, fall to plan b. */
3040         if (sctp_ifa) {
3041                 atomic_add_int(&sctp_ifa->refcount, 1);
3042                 if (net) {
3043                         /* save off where the next one we will want */
3044                         net->indx_of_eligible_next_to_use = cur_addr_num + 1;
3045                 }
3046                 return (sctp_ifa);
3047         }
3048         /*
3049          * plan_b: Look at all interfaces and find a preferred address. If
3050          * no preferred fall through to plan_c.
3051          */
3052 bound_all_plan_b:
3053         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Trying Plan B\n");
3054         LIST_FOREACH(sctp_ifn, &vrf->ifnlist, next_ifn) {
3055                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "Examine interface %s\n",
3056                     sctp_ifn->ifn_name);
3057                 if (dest_is_loop == 0 && SCTP_IFN_IS_IFT_LOOP(sctp_ifn)) {
3058                         /* wrong base scope */
3059                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "skip\n");
3060                         continue;
3061                 }
3062                 if ((sctp_ifn == looked_at) && looked_at) {
3063                         /* already looked at this guy */
3064                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "already seen\n");
3065                         continue;
3066                 }
3067                 num_preferred = sctp_count_num_preferred_boundall(sctp_ifn, inp, stcb, non_asoc_addr_ok,
3068                     dest_is_loop, dest_is_priv, fam);
3069                 SCTPDBG(SCTP_DEBUG_OUTPUT2,
3070                     "Found ifn:%p %d preferred source addresses\n",
3071                     ifn, num_preferred);
3072                 if (num_preferred == 0) {
3073                         /* None on this interface. */
3074                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "No preferred -- skipping to next\n");
3075                         continue;
3076                 }
3077                 SCTPDBG(SCTP_DEBUG_OUTPUT2,
3078                     "num preferred:%d on interface:%p cur_addr_num:%d\n",
3079                     num_preferred, (void *)sctp_ifn, cur_addr_num);
3080
3081                 /*
3082                  * Ok we have num_eligible_addr set with how many we can
3083                  * use, this may vary from call to call due to addresses
3084                  * being deprecated etc..
3085                  */
3086                 if (cur_addr_num >= num_preferred) {
3087                         cur_addr_num = 0;
3088                 }
3089                 sifa = sctp_select_nth_preferred_addr_from_ifn_boundall(sctp_ifn, inp, stcb, non_asoc_addr_ok, dest_is_loop,
3090                     dest_is_priv, cur_addr_num, fam, ro);
3091                 if (sifa == NULL)
3092                         continue;
3093                 if (net) {
3094                         net->indx_of_eligible_next_to_use = cur_addr_num + 1;
3095                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "we selected %d\n",
3096                             cur_addr_num);
3097                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Source:");
3098                         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, &sifa->address.sa);
3099                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Dest:");
3100                         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, &net->ro._l_addr.sa);
3101                 }
3102                 atomic_add_int(&sifa->refcount, 1);
3103                 return (sifa);
3104         }
3105 #ifdef INET
3106 again_with_private_addresses_allowed:
3107 #endif
3108         /* plan_c: do we have an acceptable address on the emit interface */
3109         sifa = NULL;
3110         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Trying Plan C: find acceptable on interface\n");
3111         if (emit_ifn == NULL) {
3112                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "Jump to Plan D - no emit_ifn\n");
3113                 goto plan_d;
3114         }
3115         LIST_FOREACH(sctp_ifa, &emit_ifn->ifalist, next_ifa) {
3116                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "ifa:%p\n", (void *)sctp_ifa);
3117 #ifdef INET
3118                 if ((sctp_ifa->address.sa.sa_family == AF_INET) &&
3119                     (prison_check_ip4(inp->ip_inp.inp.inp_cred,
3120                     &sctp_ifa->address.sin.sin_addr) != 0)) {
3121                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Jailed\n");
3122                         continue;
3123                 }
3124 #endif
3125 #ifdef INET6
3126                 if ((sctp_ifa->address.sa.sa_family == AF_INET6) &&
3127                     (prison_check_ip6(inp->ip_inp.inp.inp_cred,
3128                     &sctp_ifa->address.sin6.sin6_addr) != 0)) {
3129                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Jailed\n");
3130                         continue;
3131                 }
3132 #endif
3133                 if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
3134                     (non_asoc_addr_ok == 0)) {
3135                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Defer\n");
3136                         continue;
3137                 }
3138                 sifa = sctp_is_ifa_addr_acceptable(sctp_ifa, dest_is_loop,
3139                     dest_is_priv, fam);
3140                 if (sifa == NULL) {
3141                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "IFA not acceptable\n");
3142                         continue;
3143                 }
3144                 if (stcb) {
3145                         if (sctp_is_address_in_scope(sifa, &stcb->asoc.scope, 0) == 0) {
3146                                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "NOT in scope\n");
3147                                 sifa = NULL;
3148                                 continue;
3149                         }
3150                         if (((non_asoc_addr_ok == 0) &&
3151                             (sctp_is_addr_restricted(stcb, sifa))) ||
3152                             (non_asoc_addr_ok &&
3153                             (sctp_is_addr_restricted(stcb, sifa)) &&
3154                             (!sctp_is_addr_pending(stcb, sifa)))) {
3155                                 /*
3156                                  * It is restricted for some reason..
3157                                  * probably not yet added.
3158                                  */
3159                                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "Its restricted\n");
3160                                 sifa = NULL;
3161                                 continue;
3162                         }
3163                 }
3164                 atomic_add_int(&sifa->refcount, 1);
3165                 goto out;
3166         }
3167 plan_d:
3168         /*
3169          * plan_d: We are in trouble. No preferred address on the emit
3170          * interface. And not even a preferred address on all interfaces. Go
3171          * out and see if we can find an acceptable address somewhere
3172          * amongst all interfaces.
3173          */
3174         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Trying Plan D looked_at is %p\n", (void *)looked_at);
3175         LIST_FOREACH(sctp_ifn, &vrf->ifnlist, next_ifn) {
3176                 if (dest_is_loop == 0 && SCTP_IFN_IS_IFT_LOOP(sctp_ifn)) {
3177                         /* wrong base scope */
3178                         continue;
3179                 }
3180                 LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
3181 #ifdef INET
3182                         if ((sctp_ifa->address.sa.sa_family == AF_INET) &&
3183                             (prison_check_ip4(inp->ip_inp.inp.inp_cred,
3184                             &sctp_ifa->address.sin.sin_addr) != 0)) {
3185                                 continue;
3186                         }
3187 #endif
3188 #ifdef INET6
3189                         if ((sctp_ifa->address.sa.sa_family == AF_INET6) &&
3190                             (prison_check_ip6(inp->ip_inp.inp.inp_cred,
3191                             &sctp_ifa->address.sin6.sin6_addr) != 0)) {
3192                                 continue;
3193                         }
3194 #endif
3195                         if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
3196                             (non_asoc_addr_ok == 0))
3197                                 continue;
3198                         sifa = sctp_is_ifa_addr_acceptable(sctp_ifa,
3199                             dest_is_loop,
3200                             dest_is_priv, fam);
3201                         if (sifa == NULL)
3202                                 continue;
3203                         if (stcb) {
3204                                 if (sctp_is_address_in_scope(sifa, &stcb->asoc.scope, 0) == 0) {
3205                                         sifa = NULL;
3206                                         continue;
3207                                 }
3208                                 if (((non_asoc_addr_ok == 0) &&
3209                                     (sctp_is_addr_restricted(stcb, sifa))) ||
3210                                     (non_asoc_addr_ok &&
3211                                     (sctp_is_addr_restricted(stcb, sifa)) &&
3212                                     (!sctp_is_addr_pending(stcb, sifa)))) {
3213                                         /*
3214                                          * It is restricted for some
3215                                          * reason.. probably not yet added.
3216                                          */
3217                                         sifa = NULL;
3218                                         continue;
3219                                 }
3220                         }
3221                         goto out;
3222                 }
3223         }
3224 #ifdef INET
3225         if (stcb) {
3226                 if ((retried == 0) && (stcb->asoc.scope.ipv4_local_scope == 0)) {
3227                         stcb->asoc.scope.ipv4_local_scope = 1;
3228                         retried = 1;
3229                         goto again_with_private_addresses_allowed;
3230                 } else if (retried == 1) {
3231                         stcb->asoc.scope.ipv4_local_scope = 0;
3232                 }
3233         }
3234 #endif
3235 out:
3236 #ifdef INET
3237         if (sifa) {
3238                 if (retried == 1) {
3239                         LIST_FOREACH(sctp_ifn, &vrf->ifnlist, next_ifn) {
3240                                 if (dest_is_loop == 0 && SCTP_IFN_IS_IFT_LOOP(sctp_ifn)) {
3241                                         /* wrong base scope */
3242                                         continue;
3243                                 }
3244                                 LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
3245                                         struct sctp_ifa *tmp_sifa;
3246
3247 #ifdef INET
3248                                         if ((sctp_ifa->address.sa.sa_family == AF_INET) &&
3249                                             (prison_check_ip4(inp->ip_inp.inp.inp_cred,
3250                                             &sctp_ifa->address.sin.sin_addr) != 0)) {
3251                                                 continue;
3252                                         }
3253 #endif
3254 #ifdef INET6
3255                                         if ((sctp_ifa->address.sa.sa_family == AF_INET6) &&
3256                                             (prison_check_ip6(inp->ip_inp.inp.inp_cred,
3257                                             &sctp_ifa->address.sin6.sin6_addr) != 0)) {
3258                                                 continue;
3259                                         }
3260 #endif
3261                                         if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
3262                                             (non_asoc_addr_ok == 0))
3263                                                 continue;
3264                                         tmp_sifa = sctp_is_ifa_addr_acceptable(sctp_ifa,
3265                                             dest_is_loop,
3266                                             dest_is_priv, fam);
3267                                         if (tmp_sifa == NULL) {
3268                                                 continue;
3269                                         }
3270                                         if (tmp_sifa == sifa) {
3271                                                 continue;
3272                                         }
3273                                         if (stcb) {
3274                                                 if (sctp_is_address_in_scope(tmp_sifa,
3275                                                     &stcb->asoc.scope, 0) == 0) {
3276                                                         continue;
3277                                                 }
3278                                                 if (((non_asoc_addr_ok == 0) &&
3279                                                     (sctp_is_addr_restricted(stcb, tmp_sifa))) ||
3280                                                     (non_asoc_addr_ok &&
3281                                                     (sctp_is_addr_restricted(stcb, tmp_sifa)) &&
3282                                                     (!sctp_is_addr_pending(stcb, tmp_sifa)))) {
3283                                                         /*
3284                                                          * It is restricted
3285                                                          * for some reason..
3286                                                          * probably not yet
3287                                                          * added.
3288                                                          */
3289                                                         continue;
3290                                                 }
3291                                         }
3292                                         if ((tmp_sifa->address.sin.sin_family == AF_INET) &&
3293                                             (IN4_ISPRIVATE_ADDRESS(&(tmp_sifa->address.sin.sin_addr)))) {
3294                                                 sctp_add_local_addr_restricted(stcb, tmp_sifa);
3295                                         }
3296                                 }
3297                         }
3298                 }
3299                 atomic_add_int(&sifa->refcount, 1);
3300         }
3301 #endif
3302         return (sifa);
3303 }
3304
3305
3306
3307 /* tcb may be NULL */
3308 struct sctp_ifa *
3309 sctp_source_address_selection(struct sctp_inpcb *inp,
3310     struct sctp_tcb *stcb,
3311     sctp_route_t *ro,
3312     struct sctp_nets *net,
3313     int non_asoc_addr_ok, uint32_t vrf_id)
3314 {
3315         struct sctp_ifa *answer;
3316         uint8_t dest_is_priv, dest_is_loop;
3317         sa_family_t fam;
3318 #ifdef INET
3319         struct sockaddr_in *to = (struct sockaddr_in *)&ro->ro_dst;
3320 #endif
3321 #ifdef INET6
3322         struct sockaddr_in6 *to6 = (struct sockaddr_in6 *)&ro->ro_dst;
3323 #endif
3324
3325         /**
3326          * Rules:
3327          * - Find the route if needed, cache if I can.
3328          * - Look at interface address in route, Is it in the bound list. If so we
3329          *   have the best source.
3330          * - If not we must rotate amongst the addresses.
3331          *
3332          * Cavets and issues
3333          *
3334          * Do we need to pay attention to scope. We can have a private address
3335          * or a global address we are sourcing or sending to. So if we draw
3336          * it out
3337          * zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz
3338          * For V4
3339          * ------------------------------------------
3340          *      source     *      dest  *  result
3341          * -----------------------------------------
3342          * <a>  Private    *    Global  *  NAT
3343          * -----------------------------------------
3344          * <b>  Private    *    Private *  No problem
3345          * -----------------------------------------
3346          * <c>  Global     *    Private *  Huh, How will this work?
3347          * -----------------------------------------
3348          * <d>  Global     *    Global  *  No Problem
3349          *------------------------------------------
3350          * zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz
3351          * For V6
3352          *------------------------------------------
3353          *      source     *      dest  *  result
3354          * -----------------------------------------
3355          * <a>  Linklocal  *    Global  *
3356          * -----------------------------------------
3357          * <b>  Linklocal  * Linklocal  *  No problem
3358          * -----------------------------------------
3359          * <c>  Global     * Linklocal  *  Huh, How will this work?
3360          * -----------------------------------------
3361          * <d>  Global     *    Global  *  No Problem
3362          *------------------------------------------
3363          * zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz
3364          *
3365          * And then we add to that what happens if there are multiple addresses
3366          * assigned to an interface. Remember the ifa on a ifn is a linked
3367          * list of addresses. So one interface can have more than one IP
3368          * address. What happens if we have both a private and a global
3369          * address? Do we then use context of destination to sort out which
3370          * one is best? And what about NAT's sending P->G may get you a NAT
3371          * translation, or should you select the G thats on the interface in
3372          * preference.
3373          *
3374          * Decisions:
3375          *
3376          * - count the number of addresses on the interface.
3377          * - if it is one, no problem except case <c>.
3378          *   For <a> we will assume a NAT out there.
3379          * - if there are more than one, then we need to worry about scope P
3380          *   or G. We should prefer G -> G and P -> P if possible.
3381          *   Then as a secondary fall back to mixed types G->P being a last
3382          *   ditch one.
3383          * - The above all works for bound all, but bound specific we need to
3384          *   use the same concept but instead only consider the bound
3385          *   addresses. If the bound set is NOT assigned to the interface then
3386          *   we must use rotation amongst the bound addresses..
3387          */
3388         if (ro->ro_rt == NULL) {
3389                 /*
3390                  * Need a route to cache.
3391                  */
3392                 SCTP_RTALLOC(ro, vrf_id, inp->fibnum);
3393         }
3394         if (ro->ro_rt == NULL) {
3395                 return (NULL);
3396         }
3397         fam = ro->ro_dst.sa_family;
3398         dest_is_priv = dest_is_loop = 0;
3399         /* Setup our scopes for the destination */
3400         switch (fam) {
3401 #ifdef INET
3402         case AF_INET:
3403                 /* Scope based on outbound address */
3404                 if (IN4_ISLOOPBACK_ADDRESS(&to->sin_addr)) {
3405                         dest_is_loop = 1;
3406                         if (net != NULL) {
3407                                 /* mark it as local */
3408                                 net->addr_is_local = 1;
3409                         }
3410                 } else if ((IN4_ISPRIVATE_ADDRESS(&to->sin_addr))) {
3411                         dest_is_priv = 1;
3412                 }
3413                 break;
3414 #endif
3415 #ifdef INET6
3416         case AF_INET6:
3417                 /* Scope based on outbound address */
3418                 if (IN6_IS_ADDR_LOOPBACK(&to6->sin6_addr) ||
3419                     SCTP_ROUTE_IS_REAL_LOOP(ro)) {
3420                         /*
3421                          * If the address is a loopback address, which
3422                          * consists of "::1" OR "fe80::1%lo0", we are
3423                          * loopback scope. But we don't use dest_is_priv
3424                          * (link local addresses).
3425                          */
3426                         dest_is_loop = 1;
3427                         if (net != NULL) {
3428                                 /* mark it as local */
3429                                 net->addr_is_local = 1;
3430                         }
3431                 } else if (IN6_IS_ADDR_LINKLOCAL(&to6->sin6_addr)) {
3432                         dest_is_priv = 1;
3433                 }
3434                 break;
3435 #endif
3436         }
3437         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Select source addr for:");
3438         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)&ro->ro_dst);
3439         SCTP_IPI_ADDR_RLOCK();
3440         if (inp->sctp_flags & SCTP_PCB_FLAGS_BOUNDALL) {
3441                 /*
3442                  * Bound all case
3443                  */
3444                 answer = sctp_choose_boundall(inp, stcb, net, ro, vrf_id,
3445                     dest_is_priv, dest_is_loop,
3446                     non_asoc_addr_ok, fam);
3447                 SCTP_IPI_ADDR_RUNLOCK();
3448                 return (answer);
3449         }
3450         /*
3451          * Subset bound case
3452          */
3453         if (stcb) {
3454                 answer = sctp_choose_boundspecific_stcb(inp, stcb, ro,
3455                     vrf_id, dest_is_priv,
3456                     dest_is_loop,
3457                     non_asoc_addr_ok, fam);
3458         } else {
3459                 answer = sctp_choose_boundspecific_inp(inp, ro, vrf_id,
3460                     non_asoc_addr_ok,
3461                     dest_is_priv,
3462                     dest_is_loop, fam);
3463         }
3464         SCTP_IPI_ADDR_RUNLOCK();
3465         return (answer);
3466 }
3467
3468 static int
3469 sctp_find_cmsg(int c_type, void *data, struct mbuf *control, size_t cpsize)
3470 {
3471         struct cmsghdr cmh;
3472         struct sctp_sndinfo sndinfo;
3473         struct sctp_prinfo prinfo;
3474         struct sctp_authinfo authinfo;
3475         int tot_len, rem_len, cmsg_data_len, cmsg_data_off, off;
3476         int found;
3477
3478         /*
3479          * Independent of how many mbufs, find the c_type inside the control
3480          * structure and copy out the data.
3481          */
3482         found = 0;
3483         tot_len = SCTP_BUF_LEN(control);
3484         for (off = 0; off < tot_len; off += CMSG_ALIGN(cmh.cmsg_len)) {
3485                 rem_len = tot_len - off;
3486                 if (rem_len < (int)CMSG_ALIGN(sizeof(cmh))) {
3487                         /* There is not enough room for one more. */
3488                         return (found);
3489                 }
3490                 m_copydata(control, off, sizeof(cmh), (caddr_t)&cmh);
3491                 if (cmh.cmsg_len < CMSG_ALIGN(sizeof(cmh))) {
3492                         /* We dont't have a complete CMSG header. */
3493                         return (found);
3494                 }
3495                 if ((cmh.cmsg_len > INT_MAX) || ((int)cmh.cmsg_len > rem_len)) {
3496                         /* We don't have the complete CMSG. */
3497                         return (found);
3498                 }
3499                 cmsg_data_len = (int)cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh));
3500                 cmsg_data_off = off + CMSG_ALIGN(sizeof(cmh));
3501                 if ((cmh.cmsg_level == IPPROTO_SCTP) &&
3502                     ((c_type == cmh.cmsg_type) ||
3503                     ((c_type == SCTP_SNDRCV) &&
3504                     ((cmh.cmsg_type == SCTP_SNDINFO) ||
3505                     (cmh.cmsg_type == SCTP_PRINFO) ||
3506                     (cmh.cmsg_type == SCTP_AUTHINFO))))) {
3507                         if (c_type == cmh.cmsg_type) {
3508                                 if (cpsize > INT_MAX) {
3509                                         return (found);
3510                                 }
3511                                 if (cmsg_data_len < (int)cpsize) {
3512                                         return (found);
3513                                 }
3514                                 /* It is exactly what we want. Copy it out. */
3515                                 m_copydata(control, cmsg_data_off, (int)cpsize, (caddr_t)data);
3516                                 return (1);
3517                         } else {
3518                                 struct sctp_sndrcvinfo *sndrcvinfo;
3519
3520                                 sndrcvinfo = (struct sctp_sndrcvinfo *)data;
3521                                 if (found == 0) {
3522                                         if (cpsize < sizeof(struct sctp_sndrcvinfo)) {
3523                                                 return (found);
3524                                         }
3525                                         memset(sndrcvinfo, 0, sizeof(struct sctp_sndrcvinfo));
3526                                 }
3527                                 switch (cmh.cmsg_type) {
3528                                 case SCTP_SNDINFO:
3529                                         if (cmsg_data_len < (int)sizeof(struct sctp_sndinfo)) {
3530                                                 return (found);
3531                                         }
3532                                         m_copydata(control, cmsg_data_off, sizeof(struct sctp_sndinfo), (caddr_t)&sndinfo);
3533                                         sndrcvinfo->sinfo_stream = sndinfo.snd_sid;
3534                                         sndrcvinfo->sinfo_flags = sndinfo.snd_flags;
3535                                         sndrcvinfo->sinfo_ppid = sndinfo.snd_ppid;
3536                                         sndrcvinfo->sinfo_context = sndinfo.snd_context;
3537                                         sndrcvinfo->sinfo_assoc_id = sndinfo.snd_assoc_id;
3538                                         break;
3539                                 case SCTP_PRINFO:
3540                                         if (cmsg_data_len < (int)sizeof(struct sctp_prinfo)) {
3541                                                 return (found);
3542                                         }
3543                                         m_copydata(control, cmsg_data_off, sizeof(struct sctp_prinfo), (caddr_t)&prinfo);
3544                                         if (prinfo.pr_policy != SCTP_PR_SCTP_NONE) {
3545                                                 sndrcvinfo->sinfo_timetolive = prinfo.pr_value;
3546                                         } else {
3547                                                 sndrcvinfo->sinfo_timetolive = 0;
3548                                         }
3549                                         sndrcvinfo->sinfo_flags |= prinfo.pr_policy;
3550                                         break;
3551                                 case SCTP_AUTHINFO:
3552                                         if (cmsg_data_len < (int)sizeof(struct sctp_authinfo)) {
3553                                                 return (found);
3554                                         }
3555                                         m_copydata(control, cmsg_data_off, sizeof(struct sctp_authinfo), (caddr_t)&authinfo);
3556                                         sndrcvinfo->sinfo_keynumber_valid = 1;
3557                                         sndrcvinfo->sinfo_keynumber = authinfo.auth_keynumber;
3558                                         break;
3559                                 default:
3560                                         return (found);
3561                                 }
3562                                 found = 1;
3563                         }
3564                 }
3565         }
3566         return (found);
3567 }
3568
3569 static int
3570 sctp_process_cmsgs_for_init(struct sctp_tcb *stcb, struct mbuf *control, int *error)
3571 {
3572         struct cmsghdr cmh;
3573         struct sctp_initmsg initmsg;
3574 #ifdef INET
3575         struct sockaddr_in sin;
3576 #endif
3577 #ifdef INET6
3578         struct sockaddr_in6 sin6;
3579 #endif
3580         int tot_len, rem_len, cmsg_data_len, cmsg_data_off, off;
3581
3582         tot_len = SCTP_BUF_LEN(control);
3583         for (off = 0; off < tot_len; off += CMSG_ALIGN(cmh.cmsg_len)) {
3584                 rem_len = tot_len - off;
3585                 if (rem_len < (int)CMSG_ALIGN(sizeof(cmh))) {
3586                         /* There is not enough room for one more. */
3587                         *error = EINVAL;
3588                         return (1);
3589                 }
3590                 m_copydata(control, off, sizeof(cmh), (caddr_t)&cmh);
3591                 if (cmh.cmsg_len < CMSG_ALIGN(sizeof(cmh))) {
3592                         /* We dont't have a complete CMSG header. */
3593                         *error = EINVAL;
3594                         return (1);
3595                 }
3596                 if ((cmh.cmsg_len > INT_MAX) || ((int)cmh.cmsg_len > rem_len)) {
3597                         /* We don't have the complete CMSG. */
3598                         *error = EINVAL;
3599                         return (1);
3600                 }
3601                 cmsg_data_len = (int)cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh));
3602                 cmsg_data_off = off + CMSG_ALIGN(sizeof(cmh));
3603                 if (cmh.cmsg_level == IPPROTO_SCTP) {
3604                         switch (cmh.cmsg_type) {
3605                         case SCTP_INIT:
3606                                 if (cmsg_data_len < (int)sizeof(struct sctp_initmsg)) {
3607                                         *error = EINVAL;
3608                                         return (1);
3609                                 }
3610                                 m_copydata(control, cmsg_data_off, sizeof(struct sctp_initmsg), (caddr_t)&initmsg);
3611                                 if (initmsg.sinit_max_attempts)
3612                                         stcb->asoc.max_init_times = initmsg.sinit_max_attempts;
3613                                 if (initmsg.sinit_num_ostreams)
3614                                         stcb->asoc.pre_open_streams = initmsg.sinit_num_ostreams;
3615                                 if (initmsg.sinit_max_instreams)
3616                                         stcb->asoc.max_inbound_streams = initmsg.sinit_max_instreams;
3617                                 if (initmsg.sinit_max_init_timeo)
3618                                         stcb->asoc.initial_init_rto_max = initmsg.sinit_max_init_timeo;
3619                                 if (stcb->asoc.streamoutcnt < stcb->asoc.pre_open_streams) {
3620                                         struct sctp_stream_out *tmp_str;
3621                                         unsigned int i;
3622 #if defined(SCTP_DETAILED_STR_STATS)
3623                                         int j;
3624 #endif
3625
3626                                         /* Default is NOT correct */
3627                                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Ok, default:%d pre_open:%d\n",
3628                                             stcb->asoc.streamoutcnt, stcb->asoc.pre_open_streams);
3629                                         SCTP_TCB_UNLOCK(stcb);
3630                                         SCTP_MALLOC(tmp_str,
3631                                             struct sctp_stream_out *,
3632                                             (stcb->asoc.pre_open_streams * sizeof(struct sctp_stream_out)),
3633                                             SCTP_M_STRMO);
3634                                         SCTP_TCB_LOCK(stcb);
3635                                         if (tmp_str != NULL) {
3636                                                 SCTP_FREE(stcb->asoc.strmout, SCTP_M_STRMO);
3637                                                 stcb->asoc.strmout = tmp_str;
3638                                                 stcb->asoc.strm_realoutsize = stcb->asoc.streamoutcnt = stcb->asoc.pre_open_streams;
3639                                         } else {
3640                                                 stcb->asoc.pre_open_streams = stcb->asoc.streamoutcnt;
3641                                         }
3642                                         for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
3643                                                 TAILQ_INIT(&stcb->asoc.strmout[i].outqueue);
3644                                                 stcb->asoc.strmout[i].chunks_on_queues = 0;
3645                                                 stcb->asoc.strmout[i].next_mid_ordered = 0;
3646                                                 stcb->asoc.strmout[i].next_mid_unordered = 0;
3647 #if defined(SCTP_DETAILED_STR_STATS)
3648                                                 for (j = 0; j < SCTP_PR_SCTP_MAX + 1; j++) {
3649                                                         stcb->asoc.strmout[i].abandoned_sent[j] = 0;
3650                                                         stcb->asoc.strmout[i].abandoned_unsent[j] = 0;
3651                                                 }
3652 #else
3653                                                 stcb->asoc.strmout[i].abandoned_sent[0] = 0;
3654                                                 stcb->asoc.strmout[i].abandoned_unsent[0] = 0;
3655 #endif
3656                                                 stcb->asoc.strmout[i].sid = i;
3657                                                 stcb->asoc.strmout[i].last_msg_incomplete = 0;
3658                                                 stcb->asoc.strmout[i].state = SCTP_STREAM_OPENING;
3659                                                 stcb->asoc.ss_functions.sctp_ss_init_stream(stcb, &stcb->asoc.strmout[i], NULL);
3660                                         }
3661                                 }
3662                                 break;
3663 #ifdef INET
3664                         case SCTP_DSTADDRV4:
3665                                 if (cmsg_data_len < (int)sizeof(struct in_addr)) {
3666                                         *error = EINVAL;
3667                                         return (1);
3668                                 }
3669                                 memset(&sin, 0, sizeof(struct sockaddr_in));
3670                                 sin.sin_family = AF_INET;
3671                                 sin.sin_len = sizeof(struct sockaddr_in);
3672                                 sin.sin_port = stcb->rport;
3673                                 m_copydata(control, cmsg_data_off, sizeof(struct in_addr), (caddr_t)&sin.sin_addr);
3674                                 if ((sin.sin_addr.s_addr == INADDR_ANY) ||
3675                                     (sin.sin_addr.s_addr == INADDR_BROADCAST) ||
3676                                     IN_MULTICAST(ntohl(sin.sin_addr.s_addr))) {
3677                                         *error = EINVAL;
3678                                         return (1);
3679                                 }
3680                                 if (sctp_add_remote_addr(stcb, (struct sockaddr *)&sin, NULL, stcb->asoc.port,
3681                                     SCTP_DONOT_SETSCOPE, SCTP_ADDR_IS_CONFIRMED)) {
3682                                         *error = ENOBUFS;
3683                                         return (1);
3684                                 }
3685                                 break;
3686 #endif
3687 #ifdef INET6
3688                         case SCTP_DSTADDRV6:
3689                                 if (cmsg_data_len < (int)sizeof(struct in6_addr)) {
3690                                         *error = EINVAL;
3691                                         return (1);
3692                                 }
3693                                 memset(&sin6, 0, sizeof(struct sockaddr_in6));
3694                                 sin6.sin6_family = AF_INET6;
3695                                 sin6.sin6_len = sizeof(struct sockaddr_in6);
3696                                 sin6.sin6_port = stcb->rport;
3697                                 m_copydata(control, cmsg_data_off, sizeof(struct in6_addr), (caddr_t)&sin6.sin6_addr);
3698                                 if (IN6_IS_ADDR_UNSPECIFIED(&sin6.sin6_addr) ||
3699                                     IN6_IS_ADDR_MULTICAST(&sin6.sin6_addr)) {
3700                                         *error = EINVAL;
3701                                         return (1);
3702                                 }
3703 #ifdef INET
3704                                 if (IN6_IS_ADDR_V4MAPPED(&sin6.sin6_addr)) {
3705                                         in6_sin6_2_sin(&sin, &sin6);
3706                                         if ((sin.sin_addr.s_addr == INADDR_ANY) ||
3707                                             (sin.sin_addr.s_addr == INADDR_BROADCAST) ||
3708                                             IN_MULTICAST(ntohl(sin.sin_addr.s_addr))) {
3709                                                 *error = EINVAL;
3710                                                 return (1);
3711                                         }
3712                                         if (sctp_add_remote_addr(stcb, (struct sockaddr *)&sin, NULL, stcb->asoc.port,
3713                                             SCTP_DONOT_SETSCOPE, SCTP_ADDR_IS_CONFIRMED)) {
3714                                                 *error = ENOBUFS;
3715                                                 return (1);
3716                                         }
3717                                 } else
3718 #endif
3719                                         if (sctp_add_remote_addr(stcb, (struct sockaddr *)&sin6, NULL, stcb->asoc.port,
3720                                     SCTP_DONOT_SETSCOPE, SCTP_ADDR_IS_CONFIRMED)) {
3721                                         *error = ENOBUFS;
3722                                         return (1);
3723                                 }
3724                                 break;
3725 #endif
3726                         default:
3727                                 break;
3728                         }
3729                 }
3730         }
3731         return (0);
3732 }
3733
3734 #if defined(INET) || defined(INET6)
3735 static struct sctp_tcb *
3736 sctp_findassociation_cmsgs(struct sctp_inpcb **inp_p,
3737     uint16_t port,
3738     struct mbuf *control,
3739     struct sctp_nets **net_p,
3740     int *error)
3741 {
3742         struct cmsghdr cmh;
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         int tot_len, rem_len, cmsg_data_len, cmsg_data_off, off;
3752
3753         tot_len = SCTP_BUF_LEN(control);
3754         for (off = 0; off < tot_len; off += CMSG_ALIGN(cmh.cmsg_len)) {
3755                 rem_len = tot_len - off;
3756                 if (rem_len < (int)CMSG_ALIGN(sizeof(cmh))) {
3757                         /* There is not enough room for one more. */
3758                         *error = EINVAL;
3759                         return (NULL);
3760                 }
3761                 m_copydata(control, off, sizeof(cmh), (caddr_t)&cmh);
3762                 if (cmh.cmsg_len < CMSG_ALIGN(sizeof(cmh))) {
3763                         /* We dont't have a complete CMSG header. */
3764                         *error = EINVAL;
3765                         return (NULL);
3766                 }
3767                 if ((cmh.cmsg_len > INT_MAX) || ((int)cmh.cmsg_len > rem_len)) {
3768                         /* We don't have the complete CMSG. */
3769                         *error = EINVAL;
3770                         return (NULL);
3771                 }
3772                 cmsg_data_len = (int)cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh));
3773                 cmsg_data_off = off + CMSG_ALIGN(sizeof(cmh));
3774                 if (cmh.cmsg_level == IPPROTO_SCTP) {
3775                         switch (cmh.cmsg_type) {
3776 #ifdef INET
3777                         case SCTP_DSTADDRV4:
3778                                 if (cmsg_data_len < (int)sizeof(struct in_addr)) {
3779                                         *error = EINVAL;
3780                                         return (NULL);
3781                                 }
3782                                 memset(&sin, 0, sizeof(struct sockaddr_in));
3783                                 sin.sin_family = AF_INET;
3784                                 sin.sin_len = sizeof(struct sockaddr_in);
3785                                 sin.sin_port = port;
3786                                 m_copydata(control, cmsg_data_off, sizeof(struct in_addr), (caddr_t)&sin.sin_addr);
3787                                 addr = (struct sockaddr *)&sin;
3788                                 break;
3789 #endif
3790 #ifdef INET6
3791                         case SCTP_DSTADDRV6:
3792                                 if (cmsg_data_len < (int)sizeof(struct in6_addr)) {
3793                                         *error = EINVAL;
3794                                         return (NULL);
3795                                 }
3796                                 memset(&sin6, 0, sizeof(struct sockaddr_in6));
3797                                 sin6.sin6_family = AF_INET6;
3798                                 sin6.sin6_len = sizeof(struct sockaddr_in6);
3799                                 sin6.sin6_port = port;
3800                                 m_copydata(control, cmsg_data_off, sizeof(struct in6_addr), (caddr_t)&sin6.sin6_addr);
3801 #ifdef INET
3802                                 if (IN6_IS_ADDR_V4MAPPED(&sin6.sin6_addr)) {
3803                                         in6_sin6_2_sin(&sin, &sin6);
3804                                         addr = (struct sockaddr *)&sin;
3805                                 } else
3806 #endif
3807                                         addr = (struct sockaddr *)&sin6;
3808                                 break;
3809 #endif
3810                         default:
3811                                 addr = NULL;
3812                                 break;
3813                         }
3814                         if (addr) {
3815                                 stcb = sctp_findassociation_ep_addr(inp_p, addr, net_p, NULL, NULL);
3816                                 if (stcb != NULL) {
3817                                         return (stcb);
3818                                 }
3819                         }
3820                 }
3821         }
3822         return (NULL);
3823 }
3824 #endif
3825
3826 static struct mbuf *
3827 sctp_add_cookie(struct mbuf *init, int init_offset,
3828     struct mbuf *initack, int initack_offset, struct sctp_state_cookie *stc_in, uint8_t **signature)
3829 {
3830         struct mbuf *copy_init, *copy_initack, *m_at, *sig, *mret;
3831         struct sctp_state_cookie *stc;
3832         struct sctp_paramhdr *ph;
3833         uint16_t cookie_sz;
3834
3835         mret = sctp_get_mbuf_for_msg((sizeof(struct sctp_state_cookie) +
3836             sizeof(struct sctp_paramhdr)), 0,
3837             M_NOWAIT, 1, MT_DATA);
3838         if (mret == NULL) {
3839                 return (NULL);
3840         }
3841         copy_init = SCTP_M_COPYM(init, init_offset, M_COPYALL, M_NOWAIT);
3842         if (copy_init == NULL) {
3843                 sctp_m_freem(mret);
3844                 return (NULL);
3845         }
3846 #ifdef SCTP_MBUF_LOGGING
3847         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
3848                 sctp_log_mbc(copy_init, SCTP_MBUF_ICOPY);
3849         }
3850 #endif
3851         copy_initack = SCTP_M_COPYM(initack, initack_offset, M_COPYALL,
3852             M_NOWAIT);
3853         if (copy_initack == NULL) {
3854                 sctp_m_freem(mret);
3855                 sctp_m_freem(copy_init);
3856                 return (NULL);
3857         }
3858 #ifdef SCTP_MBUF_LOGGING
3859         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
3860                 sctp_log_mbc(copy_initack, SCTP_MBUF_ICOPY);
3861         }
3862 #endif
3863         /* easy side we just drop it on the end */
3864         ph = mtod(mret, struct sctp_paramhdr *);
3865         SCTP_BUF_LEN(mret) = sizeof(struct sctp_state_cookie) +
3866             sizeof(struct sctp_paramhdr);
3867         stc = (struct sctp_state_cookie *)((caddr_t)ph +
3868             sizeof(struct sctp_paramhdr));
3869         ph->param_type = htons(SCTP_STATE_COOKIE);
3870         ph->param_length = 0;   /* fill in at the end */
3871         /* Fill in the stc cookie data */
3872         memcpy(stc, stc_in, sizeof(struct sctp_state_cookie));
3873
3874         /* tack the INIT and then the INIT-ACK onto the chain */
3875         cookie_sz = 0;
3876         for (m_at = mret; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
3877                 cookie_sz += SCTP_BUF_LEN(m_at);
3878                 if (SCTP_BUF_NEXT(m_at) == NULL) {
3879                         SCTP_BUF_NEXT(m_at) = copy_init;
3880                         break;
3881                 }
3882         }
3883         for (m_at = copy_init; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
3884                 cookie_sz += SCTP_BUF_LEN(m_at);
3885                 if (SCTP_BUF_NEXT(m_at) == NULL) {
3886                         SCTP_BUF_NEXT(m_at) = copy_initack;
3887                         break;
3888                 }
3889         }
3890         for (m_at = copy_initack; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
3891                 cookie_sz += SCTP_BUF_LEN(m_at);
3892                 if (SCTP_BUF_NEXT(m_at) == NULL) {
3893                         break;
3894                 }
3895         }
3896         sig = sctp_get_mbuf_for_msg(SCTP_SIGNATURE_SIZE, 0, M_NOWAIT, 1, MT_DATA);
3897         if (sig == NULL) {
3898                 /* no space, so free the entire chain */
3899                 sctp_m_freem(mret);
3900                 return (NULL);
3901         }
3902         SCTP_BUF_NEXT(m_at) = sig;
3903         SCTP_BUF_LEN(sig) = SCTP_SIGNATURE_SIZE;
3904         cookie_sz += SCTP_SIGNATURE_SIZE;
3905         ph->param_length = htons(cookie_sz);
3906         *signature = (uint8_t *)mtod(sig, caddr_t);
3907         memset(*signature, 0, SCTP_SIGNATURE_SIZE);
3908         return (mret);
3909 }
3910
3911 static uint8_t
3912 sctp_get_ect(struct sctp_tcb *stcb)
3913 {
3914         if ((stcb != NULL) && (stcb->asoc.ecn_supported == 1)) {
3915                 return (SCTP_ECT0_BIT);
3916         } else {
3917                 return (0);
3918         }
3919 }
3920
3921 #if defined(INET) || defined(INET6)
3922 static void
3923 sctp_handle_no_route(struct sctp_tcb *stcb,
3924     struct sctp_nets *net,
3925     int so_locked)
3926 {
3927         SCTPDBG(SCTP_DEBUG_OUTPUT1, "dropped packet - no valid source addr\n");
3928
3929         if (net) {
3930                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Destination was ");
3931                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT1, &net->ro._l_addr.sa);
3932                 if (net->dest_state & SCTP_ADDR_CONFIRMED) {
3933                         if ((net->dest_state & SCTP_ADDR_REACHABLE) && stcb) {
3934                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "no route takes interface %p down\n", (void *)net);
3935                                 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_DOWN,
3936                                     stcb, 0,
3937                                     (void *)net,
3938                                     so_locked);
3939                                 net->dest_state &= ~SCTP_ADDR_REACHABLE;
3940                                 net->dest_state &= ~SCTP_ADDR_PF;
3941                         }
3942                 }
3943                 if (stcb) {
3944                         if (net == stcb->asoc.primary_destination) {
3945                                 /* need a new primary */
3946                                 struct sctp_nets *alt;
3947
3948                                 alt = sctp_find_alternate_net(stcb, net, 0);
3949                                 if (alt != net) {
3950                                         if (stcb->asoc.alternate) {
3951                                                 sctp_free_remote_addr(stcb->asoc.alternate);
3952                                         }
3953                                         stcb->asoc.alternate = alt;
3954                                         atomic_add_int(&stcb->asoc.alternate->ref_count, 1);
3955                                         if (net->ro._s_addr) {
3956                                                 sctp_free_ifa(net->ro._s_addr);
3957                                                 net->ro._s_addr = NULL;
3958                                         }
3959                                         net->src_addr_selected = 0;
3960                                 }
3961                         }
3962                 }
3963         }
3964 }
3965 #endif
3966
3967 static int
3968 sctp_lowlevel_chunk_output(struct sctp_inpcb *inp,
3969     struct sctp_tcb *stcb,      /* may be NULL */
3970     struct sctp_nets *net,
3971     struct sockaddr *to,
3972     struct mbuf *m,
3973     uint32_t auth_offset,
3974     struct sctp_auth_chunk *auth,
3975     uint16_t auth_keyid,
3976     int nofragment_flag,
3977     int ecn_ok,
3978     int out_of_asoc_ok,
3979     uint16_t src_port,
3980     uint16_t dest_port,
3981     uint32_t v_tag,
3982     uint16_t port,
3983     union sctp_sockstore *over_addr,
3984     uint8_t mflowtype, uint32_t mflowid,
3985     int so_locked)
3986 {
3987 /* nofragment_flag to tell if IP_DF should be set (IPv4 only) */
3988         /**
3989          * Given a mbuf chain (via SCTP_BUF_NEXT()) that holds a packet header
3990          * WITH an SCTPHDR but no IP header, endpoint inp and sa structure:
3991          * - fill in the HMAC digest of any AUTH chunk in the packet.
3992          * - calculate and fill in the SCTP checksum.
3993          * - prepend an IP address header.
3994          * - if boundall use INADDR_ANY.
3995          * - if boundspecific do source address selection.
3996          * - set fragmentation option for ipV4.
3997          * - On return from IP output, check/adjust mtu size of output
3998          *   interface and smallest_mtu size as well.
3999          */
4000         /* Will need ifdefs around this */
4001         struct mbuf *newm;
4002         struct sctphdr *sctphdr;
4003         int packet_length;
4004         int ret;
4005 #if defined(INET) || defined(INET6)
4006         uint32_t vrf_id;
4007 #endif
4008 #if defined(INET) || defined(INET6)
4009         struct mbuf *o_pak;
4010         sctp_route_t *ro = NULL;
4011         struct udphdr *udp = NULL;
4012 #endif
4013         uint8_t tos_value;
4014
4015         if ((net) && (net->dest_state & SCTP_ADDR_OUT_OF_SCOPE)) {
4016                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EFAULT);
4017                 sctp_m_freem(m);
4018                 return (EFAULT);
4019         }
4020 #if defined(INET) || defined(INET6)
4021         if (stcb) {
4022                 vrf_id = stcb->asoc.vrf_id;
4023         } else {
4024                 vrf_id = inp->def_vrf_id;
4025         }
4026 #endif
4027         /* fill in the HMAC digest for any AUTH chunk in the packet */
4028         if ((auth != NULL) && (stcb != NULL)) {
4029                 sctp_fill_hmac_digest_m(m, auth_offset, auth, stcb, auth_keyid);
4030         }
4031
4032         if (net) {
4033                 tos_value = net->dscp;
4034         } else if (stcb) {
4035                 tos_value = stcb->asoc.default_dscp;
4036         } else {
4037                 tos_value = inp->sctp_ep.default_dscp;
4038         }
4039
4040         switch (to->sa_family) {
4041 #ifdef INET
4042         case AF_INET:
4043                 {
4044                         struct ip *ip = NULL;
4045                         sctp_route_t iproute;
4046                         int len;
4047
4048                         len = SCTP_MIN_V4_OVERHEAD;
4049                         if (port) {
4050                                 len += sizeof(struct udphdr);
4051                         }
4052                         newm = sctp_get_mbuf_for_msg(len, 1, M_NOWAIT, 1, MT_DATA);
4053                         if (newm == NULL) {
4054                                 sctp_m_freem(m);
4055                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
4056                                 return (ENOMEM);
4057                         }
4058                         SCTP_ALIGN_TO_END(newm, len);
4059                         SCTP_BUF_LEN(newm) = len;
4060                         SCTP_BUF_NEXT(newm) = m;
4061                         m = newm;
4062                         if (net != NULL) {
4063                                 m->m_pkthdr.flowid = net->flowid;
4064                                 M_HASHTYPE_SET(m, net->flowtype);
4065                         } else {
4066                                 m->m_pkthdr.flowid = mflowid;
4067                                 M_HASHTYPE_SET(m, mflowtype);
4068                         }
4069                         packet_length = sctp_calculate_len(m);
4070                         ip = mtod(m, struct ip *);
4071                         ip->ip_v = IPVERSION;
4072                         ip->ip_hl = (sizeof(struct ip) >> 2);
4073                         if (tos_value == 0) {
4074                                 /*
4075                                  * This means especially, that it is not set
4076                                  * at the SCTP layer. So use the value from
4077                                  * the IP layer.
4078                                  */
4079                                 tos_value = inp->ip_inp.inp.inp_ip_tos;
4080                         }
4081                         tos_value &= 0xfc;
4082                         if (ecn_ok) {
4083                                 tos_value |= sctp_get_ect(stcb);
4084                         }
4085                         if ((nofragment_flag) && (port == 0)) {
4086                                 ip->ip_off = htons(IP_DF);
4087                         } else {
4088                                 ip->ip_off = htons(0);
4089                         }
4090                         /* FreeBSD has a function for ip_id's */
4091                         ip_fillid(ip);
4092
4093                         ip->ip_ttl = inp->ip_inp.inp.inp_ip_ttl;
4094                         ip->ip_len = htons(packet_length);
4095                         ip->ip_tos = tos_value;
4096                         if (port) {
4097                                 ip->ip_p = IPPROTO_UDP;
4098                         } else {
4099                                 ip->ip_p = IPPROTO_SCTP;
4100                         }
4101                         ip->ip_sum = 0;
4102                         if (net == NULL) {
4103                                 ro = &iproute;
4104                                 memset(&iproute, 0, sizeof(iproute));
4105                                 memcpy(&ro->ro_dst, to, to->sa_len);
4106                         } else {
4107                                 ro = (sctp_route_t *)&net->ro;
4108                         }
4109                         /* Now the address selection part */
4110                         ip->ip_dst.s_addr = ((struct sockaddr_in *)to)->sin_addr.s_addr;
4111
4112                         /* call the routine to select the src address */
4113                         if (net && out_of_asoc_ok == 0) {
4114                                 if (net->ro._s_addr && (net->ro._s_addr->localifa_flags & (SCTP_BEING_DELETED | SCTP_ADDR_IFA_UNUSEABLE))) {
4115                                         sctp_free_ifa(net->ro._s_addr);
4116                                         net->ro._s_addr = NULL;
4117                                         net->src_addr_selected = 0;
4118                                         if (ro->ro_rt) {
4119                                                 RTFREE(ro->ro_rt);
4120                                                 ro->ro_rt = NULL;
4121                                         }
4122                                 }
4123                                 if (net->src_addr_selected == 0) {
4124                                         /* Cache the source address */
4125                                         net->ro._s_addr = sctp_source_address_selection(inp, stcb,
4126                                             ro, net, 0,
4127                                             vrf_id);
4128                                         net->src_addr_selected = 1;
4129                                 }
4130                                 if (net->ro._s_addr == NULL) {
4131                                         /* No route to host */
4132                                         net->src_addr_selected = 0;
4133                                         sctp_handle_no_route(stcb, net, so_locked);
4134                                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4135                                         sctp_m_freem(m);
4136                                         return (EHOSTUNREACH);
4137                                 }
4138                                 ip->ip_src = net->ro._s_addr->address.sin.sin_addr;
4139                         } else {
4140                                 if (over_addr == NULL) {
4141                                         struct sctp_ifa *_lsrc;
4142
4143                                         _lsrc = sctp_source_address_selection(inp, stcb, ro,
4144                                             net,
4145                                             out_of_asoc_ok,
4146                                             vrf_id);
4147                                         if (_lsrc == NULL) {
4148                                                 sctp_handle_no_route(stcb, net, so_locked);
4149                                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4150                                                 sctp_m_freem(m);
4151                                                 return (EHOSTUNREACH);
4152                                         }
4153                                         ip->ip_src = _lsrc->address.sin.sin_addr;
4154                                         sctp_free_ifa(_lsrc);
4155                                 } else {
4156                                         ip->ip_src = over_addr->sin.sin_addr;
4157                                         SCTP_RTALLOC(ro, vrf_id, inp->fibnum);
4158                                 }
4159                         }
4160                         if (port) {
4161                                 if (htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port)) == 0) {
4162                                         sctp_handle_no_route(stcb, net, so_locked);
4163                                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4164                                         sctp_m_freem(m);
4165                                         return (EHOSTUNREACH);
4166                                 }
4167                                 udp = (struct udphdr *)((caddr_t)ip + sizeof(struct ip));
4168                                 udp->uh_sport = htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port));
4169                                 udp->uh_dport = port;
4170                                 udp->uh_ulen = htons((uint16_t)(packet_length - sizeof(struct ip)));
4171                                 if (V_udp_cksum) {
4172                                         udp->uh_sum = in_pseudo(ip->ip_src.s_addr, ip->ip_dst.s_addr, udp->uh_ulen + htons(IPPROTO_UDP));
4173                                 } else {
4174                                         udp->uh_sum = 0;
4175                                 }
4176                                 sctphdr = (struct sctphdr *)((caddr_t)udp + sizeof(struct udphdr));
4177                         } else {
4178                                 sctphdr = (struct sctphdr *)((caddr_t)ip + sizeof(struct ip));
4179                         }
4180
4181                         sctphdr->src_port = src_port;
4182                         sctphdr->dest_port = dest_port;
4183                         sctphdr->v_tag = v_tag;
4184                         sctphdr->checksum = 0;
4185
4186                         /*
4187                          * If source address selection fails and we find no
4188                          * route then the ip_output should fail as well with
4189                          * a NO_ROUTE_TO_HOST type error. We probably should
4190                          * catch that somewhere and abort the association
4191                          * right away (assuming this is an INIT being sent).
4192                          */
4193                         if (ro->ro_rt == NULL) {
4194                                 /*
4195                                  * src addr selection failed to find a route
4196                                  * (or valid source addr), so we can't get
4197                                  * there from here (yet)!
4198                                  */
4199                                 sctp_handle_no_route(stcb, net, so_locked);
4200                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4201                                 sctp_m_freem(m);
4202                                 return (EHOSTUNREACH);
4203                         }
4204                         if (ro != &iproute) {
4205                                 memcpy(&iproute, ro, sizeof(*ro));
4206                         }
4207                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "Calling ipv4 output routine from low level src addr:%x\n",
4208                             (uint32_t)(ntohl(ip->ip_src.s_addr)));
4209                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "Destination is %x\n",
4210                             (uint32_t)(ntohl(ip->ip_dst.s_addr)));
4211                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "RTP route is %p through\n",
4212                             (void *)ro->ro_rt);
4213
4214                         if (SCTP_GET_HEADER_FOR_OUTPUT(o_pak)) {
4215                                 /* failed to prepend data, give up */
4216                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
4217                                 sctp_m_freem(m);
4218                                 return (ENOMEM);
4219                         }
4220                         SCTP_ATTACH_CHAIN(o_pak, m, packet_length);
4221                         if (port) {
4222                                 sctphdr->checksum = sctp_calculate_cksum(m, sizeof(struct ip) + sizeof(struct udphdr));
4223                                 SCTP_STAT_INCR(sctps_sendswcrc);
4224                                 if (V_udp_cksum) {
4225                                         SCTP_ENABLE_UDP_CSUM(o_pak);
4226                                 }
4227                         } else {
4228                                 m->m_pkthdr.csum_flags = CSUM_SCTP;
4229                                 m->m_pkthdr.csum_data = offsetof(struct sctphdr, checksum);
4230                                 SCTP_STAT_INCR(sctps_sendhwcrc);
4231                         }
4232 #ifdef SCTP_PACKET_LOGGING
4233                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING)
4234                                 sctp_packet_log(o_pak);
4235 #endif
4236                         /* send it out.  table id is taken from stcb */
4237                         SCTP_PROBE5(send, NULL, stcb, ip, stcb, sctphdr);
4238                         SCTP_IP_OUTPUT(ret, o_pak, ro, stcb, vrf_id);
4239                         if (port) {
4240                                 UDPSTAT_INC(udps_opackets);
4241                         }
4242                         SCTP_STAT_INCR(sctps_sendpackets);
4243                         SCTP_STAT_INCR_COUNTER64(sctps_outpackets);
4244                         if (ret)
4245                                 SCTP_STAT_INCR(sctps_senderrors);
4246
4247                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "IP output returns %d\n", ret);
4248                         if (net == NULL) {
4249                                 /* free tempy routes */
4250                                 RO_RTFREE(ro);
4251                         } else {
4252                                 if ((ro->ro_rt != NULL) && (net->ro._s_addr) &&
4253                                     ((net->dest_state & SCTP_ADDR_NO_PMTUD) == 0)) {
4254                                         uint32_t mtu;
4255
4256                                         mtu = SCTP_GATHER_MTU_FROM_ROUTE(net->ro._s_addr, &net->ro._l_addr.sa, ro->ro_rt);
4257                                         if (mtu > 0) {
4258                                                 if (net->port) {
4259                                                         mtu -= sizeof(struct udphdr);
4260                                                 }
4261                                                 if (mtu < net->mtu) {
4262                                                         if ((stcb != NULL) && (stcb->asoc.smallest_mtu > mtu)) {
4263                                                                 sctp_mtu_size_reset(inp, &stcb->asoc, mtu);
4264                                                         }
4265                                                         net->mtu = mtu;
4266                                                 }
4267                                         }
4268                                 } else if (ro->ro_rt == NULL) {
4269                                         /* route was freed */
4270                                         if (net->ro._s_addr &&
4271                                             net->src_addr_selected) {
4272                                                 sctp_free_ifa(net->ro._s_addr);
4273                                                 net->ro._s_addr = NULL;
4274                                         }
4275                                         net->src_addr_selected = 0;
4276                                 }
4277                         }
4278                         return (ret);
4279                 }
4280 #endif
4281 #ifdef INET6
4282         case AF_INET6:
4283                 {
4284                         uint32_t flowlabel, flowinfo;
4285                         struct ip6_hdr *ip6h;
4286                         struct route_in6 ip6route;
4287                         struct ifnet *ifp;
4288                         struct sockaddr_in6 *sin6, tmp, *lsa6, lsa6_tmp;
4289                         int prev_scope = 0;
4290                         struct sockaddr_in6 lsa6_storage;
4291                         int error;
4292                         u_short prev_port = 0;
4293                         int len;
4294
4295                         if (net) {
4296                                 flowlabel = net->flowlabel;
4297                         } else if (stcb) {
4298                                 flowlabel = stcb->asoc.default_flowlabel;
4299                         } else {
4300                                 flowlabel = inp->sctp_ep.default_flowlabel;
4301                         }
4302                         if (flowlabel == 0) {
4303                                 /*
4304                                  * This means especially, that it is not set
4305                                  * at the SCTP layer. So use the value from
4306                                  * the IP layer.
4307                                  */
4308                                 flowlabel = ntohl(((struct inpcb *)inp)->inp_flow);
4309                         }
4310                         flowlabel &= 0x000fffff;
4311                         len = SCTP_MIN_OVERHEAD;
4312                         if (port) {
4313                                 len += sizeof(struct udphdr);
4314                         }
4315                         newm = sctp_get_mbuf_for_msg(len, 1, M_NOWAIT, 1, MT_DATA);
4316                         if (newm == NULL) {
4317                                 sctp_m_freem(m);
4318                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
4319                                 return (ENOMEM);
4320                         }
4321                         SCTP_ALIGN_TO_END(newm, len);
4322                         SCTP_BUF_LEN(newm) = len;
4323                         SCTP_BUF_NEXT(newm) = m;
4324                         m = newm;
4325                         if (net != NULL) {
4326                                 m->m_pkthdr.flowid = net->flowid;
4327                                 M_HASHTYPE_SET(m, net->flowtype);
4328                         } else {
4329                                 m->m_pkthdr.flowid = mflowid;
4330                                 M_HASHTYPE_SET(m, mflowtype);
4331                         }
4332                         packet_length = sctp_calculate_len(m);
4333
4334                         ip6h = mtod(m, struct ip6_hdr *);
4335                         /* protect *sin6 from overwrite */
4336                         sin6 = (struct sockaddr_in6 *)to;
4337                         tmp = *sin6;
4338                         sin6 = &tmp;
4339
4340                         /* KAME hack: embed scopeid */
4341                         if (sa6_embedscope(sin6, MODULE_GLOBAL(ip6_use_defzone)) != 0) {
4342                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
4343                                 sctp_m_freem(m);
4344                                 return (EINVAL);
4345                         }
4346                         if (net == NULL) {
4347                                 memset(&ip6route, 0, sizeof(ip6route));
4348                                 ro = (sctp_route_t *)&ip6route;
4349                                 memcpy(&ro->ro_dst, sin6, sin6->sin6_len);
4350                         } else {
4351                                 ro = (sctp_route_t *)&net->ro;
4352                         }
4353                         /*
4354                          * We assume here that inp_flow is in host byte
4355                          * order within the TCB!
4356                          */
4357                         if (tos_value == 0) {
4358                                 /*
4359                                  * This means especially, that it is not set
4360                                  * at the SCTP layer. So use the value from
4361                                  * the IP layer.
4362                                  */
4363                                 tos_value = (ntohl(((struct inpcb *)inp)->inp_flow) >> 20) & 0xff;
4364                         }
4365                         tos_value &= 0xfc;
4366                         if (ecn_ok) {
4367                                 tos_value |= sctp_get_ect(stcb);
4368                         }
4369                         flowinfo = 0x06;
4370                         flowinfo <<= 8;
4371                         flowinfo |= tos_value;
4372                         flowinfo <<= 20;
4373                         flowinfo |= flowlabel;
4374                         ip6h->ip6_flow = htonl(flowinfo);
4375                         if (port) {
4376                                 ip6h->ip6_nxt = IPPROTO_UDP;
4377                         } else {
4378                                 ip6h->ip6_nxt = IPPROTO_SCTP;
4379                         }
4380                         ip6h->ip6_plen = htons((uint16_t)(packet_length - sizeof(struct ip6_hdr)));
4381                         ip6h->ip6_dst = sin6->sin6_addr;
4382
4383                         /*
4384                          * Add SRC address selection here: we can only reuse
4385                          * to a limited degree the kame src-addr-sel, since
4386                          * we can try their selection but it may not be
4387                          * bound.
4388                          */
4389                         memset(&lsa6_tmp, 0, sizeof(lsa6_tmp));
4390                         lsa6_tmp.sin6_family = AF_INET6;
4391                         lsa6_tmp.sin6_len = sizeof(lsa6_tmp);
4392                         lsa6 = &lsa6_tmp;
4393                         if (net && out_of_asoc_ok == 0) {
4394                                 if (net->ro._s_addr && (net->ro._s_addr->localifa_flags & (SCTP_BEING_DELETED | SCTP_ADDR_IFA_UNUSEABLE))) {
4395                                         sctp_free_ifa(net->ro._s_addr);
4396                                         net->ro._s_addr = NULL;
4397                                         net->src_addr_selected = 0;
4398                                         if (ro->ro_rt) {
4399                                                 RTFREE(ro->ro_rt);
4400                                                 ro->ro_rt = NULL;
4401                                         }
4402                                 }
4403                                 if (net->src_addr_selected == 0) {
4404                                         sin6 = (struct sockaddr_in6 *)&net->ro._l_addr;
4405                                         /* KAME hack: embed scopeid */
4406                                         if (sa6_embedscope(sin6, MODULE_GLOBAL(ip6_use_defzone)) != 0) {
4407                                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
4408                                                 sctp_m_freem(m);
4409                                                 return (EINVAL);
4410                                         }
4411                                         /* Cache the source address */
4412                                         net->ro._s_addr = sctp_source_address_selection(inp,
4413                                             stcb,
4414                                             ro,
4415                                             net,
4416                                             0,
4417                                             vrf_id);
4418                                         (void)sa6_recoverscope(sin6);
4419                                         net->src_addr_selected = 1;
4420                                 }
4421                                 if (net->ro._s_addr == NULL) {
4422                                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "V6:No route to host\n");
4423                                         net->src_addr_selected = 0;
4424                                         sctp_handle_no_route(stcb, net, so_locked);
4425                                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4426                                         sctp_m_freem(m);
4427                                         return (EHOSTUNREACH);
4428                                 }
4429                                 lsa6->sin6_addr = net->ro._s_addr->address.sin6.sin6_addr;
4430                         } else {
4431                                 sin6 = (struct sockaddr_in6 *)&ro->ro_dst;
4432                                 /* KAME hack: embed scopeid */
4433                                 if (sa6_embedscope(sin6, MODULE_GLOBAL(ip6_use_defzone)) != 0) {
4434                                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
4435                                         sctp_m_freem(m);
4436                                         return (EINVAL);
4437                                 }
4438                                 if (over_addr == NULL) {
4439                                         struct sctp_ifa *_lsrc;
4440
4441                                         _lsrc = sctp_source_address_selection(inp, stcb, ro,
4442                                             net,
4443                                             out_of_asoc_ok,
4444                                             vrf_id);
4445                                         if (_lsrc == NULL) {
4446                                                 sctp_handle_no_route(stcb, net, so_locked);
4447                                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4448                                                 sctp_m_freem(m);
4449                                                 return (EHOSTUNREACH);
4450                                         }
4451                                         lsa6->sin6_addr = _lsrc->address.sin6.sin6_addr;
4452                                         sctp_free_ifa(_lsrc);
4453                                 } else {
4454                                         lsa6->sin6_addr = over_addr->sin6.sin6_addr;
4455                                         SCTP_RTALLOC(ro, vrf_id, inp->fibnum);
4456                                 }
4457                                 (void)sa6_recoverscope(sin6);
4458                         }
4459                         lsa6->sin6_port = inp->sctp_lport;
4460
4461                         if (ro->ro_rt == NULL) {
4462                                 /*
4463                                  * src addr selection failed to find a route
4464                                  * (or valid source addr), so we can't get
4465                                  * there from here!
4466                                  */
4467                                 sctp_handle_no_route(stcb, net, so_locked);
4468                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4469                                 sctp_m_freem(m);
4470                                 return (EHOSTUNREACH);
4471                         }
4472                         /*
4473                          * XXX: sa6 may not have a valid sin6_scope_id in
4474                          * the non-SCOPEDROUTING case.
4475                          */
4476                         memset(&lsa6_storage, 0, sizeof(lsa6_storage));
4477                         lsa6_storage.sin6_family = AF_INET6;
4478                         lsa6_storage.sin6_len = sizeof(lsa6_storage);
4479                         lsa6_storage.sin6_addr = lsa6->sin6_addr;
4480                         if ((error = sa6_recoverscope(&lsa6_storage)) != 0) {
4481                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "recover scope fails error %d\n", error);
4482                                 sctp_m_freem(m);
4483                                 return (error);
4484                         }
4485                         /* XXX */
4486                         lsa6_storage.sin6_addr = lsa6->sin6_addr;
4487                         lsa6_storage.sin6_port = inp->sctp_lport;
4488                         lsa6 = &lsa6_storage;
4489                         ip6h->ip6_src = lsa6->sin6_addr;
4490
4491                         if (port) {
4492                                 if (htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port)) == 0) {
4493                                         sctp_handle_no_route(stcb, net, so_locked);
4494                                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4495                                         sctp_m_freem(m);
4496                                         return (EHOSTUNREACH);
4497                                 }
4498                                 udp = (struct udphdr *)((caddr_t)ip6h + sizeof(struct ip6_hdr));
4499                                 udp->uh_sport = htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port));
4500                                 udp->uh_dport = port;
4501                                 udp->uh_ulen = htons((uint16_t)(packet_length - sizeof(struct ip6_hdr)));
4502                                 udp->uh_sum = 0;
4503                                 sctphdr = (struct sctphdr *)((caddr_t)udp + sizeof(struct udphdr));
4504                         } else {
4505                                 sctphdr = (struct sctphdr *)((caddr_t)ip6h + sizeof(struct ip6_hdr));
4506                         }
4507
4508                         sctphdr->src_port = src_port;
4509                         sctphdr->dest_port = dest_port;
4510                         sctphdr->v_tag = v_tag;
4511                         sctphdr->checksum = 0;
4512
4513                         /*
4514                          * We set the hop limit now since there is a good
4515                          * chance that our ro pointer is now filled
4516                          */
4517                         ip6h->ip6_hlim = SCTP_GET_HLIM(inp, ro);
4518                         ifp = SCTP_GET_IFN_VOID_FROM_ROUTE(ro);
4519
4520 #ifdef SCTP_DEBUG
4521                         /* Copy to be sure something bad is not happening */
4522                         sin6->sin6_addr = ip6h->ip6_dst;
4523                         lsa6->sin6_addr = ip6h->ip6_src;
4524 #endif
4525
4526                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "Calling ipv6 output routine from low level\n");
4527                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "src: ");
4528                         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT3, (struct sockaddr *)lsa6);
4529                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "dst: ");
4530                         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT3, (struct sockaddr *)sin6);
4531                         if (net) {
4532                                 sin6 = (struct sockaddr_in6 *)&net->ro._l_addr;
4533                                 /*
4534                                  * preserve the port and scope for link
4535                                  * local send
4536                                  */
4537                                 prev_scope = sin6->sin6_scope_id;
4538                                 prev_port = sin6->sin6_port;
4539                         }
4540
4541                         if (SCTP_GET_HEADER_FOR_OUTPUT(o_pak)) {
4542                                 /* failed to prepend data, give up */
4543                                 sctp_m_freem(m);
4544                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
4545                                 return (ENOMEM);
4546                         }
4547                         SCTP_ATTACH_CHAIN(o_pak, m, packet_length);
4548                         if (port) {
4549                                 sctphdr->checksum = sctp_calculate_cksum(m, sizeof(struct ip6_hdr) + sizeof(struct udphdr));
4550                                 SCTP_STAT_INCR(sctps_sendswcrc);
4551                                 if ((udp->uh_sum = in6_cksum(o_pak, IPPROTO_UDP, sizeof(struct ip6_hdr), packet_length - sizeof(struct ip6_hdr))) == 0) {
4552                                         udp->uh_sum = 0xffff;
4553                                 }
4554                         } else {
4555                                 m->m_pkthdr.csum_flags = CSUM_SCTP_IPV6;
4556                                 m->m_pkthdr.csum_data = offsetof(struct sctphdr, checksum);
4557                                 SCTP_STAT_INCR(sctps_sendhwcrc);
4558                         }
4559                         /* send it out. table id is taken from stcb */
4560 #ifdef SCTP_PACKET_LOGGING
4561                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING)
4562                                 sctp_packet_log(o_pak);
4563 #endif
4564                         SCTP_PROBE5(send, NULL, stcb, ip6h, stcb, sctphdr);
4565                         SCTP_IP6_OUTPUT(ret, o_pak, (struct route_in6 *)ro, &ifp, stcb, vrf_id);
4566                         if (net) {
4567                                 /* for link local this must be done */
4568                                 sin6->sin6_scope_id = prev_scope;
4569                                 sin6->sin6_port = prev_port;
4570                         }
4571                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "return from send is %d\n", ret);
4572                         if (port) {
4573                                 UDPSTAT_INC(udps_opackets);
4574                         }
4575                         SCTP_STAT_INCR(sctps_sendpackets);
4576                         SCTP_STAT_INCR_COUNTER64(sctps_outpackets);
4577                         if (ret) {
4578                                 SCTP_STAT_INCR(sctps_senderrors);
4579                         }
4580                         if (net == NULL) {
4581                                 /* Now if we had a temp route free it */
4582                                 RO_RTFREE(ro);
4583                         } else {
4584                                 /*
4585                                  * PMTU check versus smallest asoc MTU goes
4586                                  * here
4587                                  */
4588                                 if (ro->ro_rt == NULL) {
4589                                         /* Route was freed */
4590                                         if (net->ro._s_addr &&
4591                                             net->src_addr_selected) {
4592                                                 sctp_free_ifa(net->ro._s_addr);
4593                                                 net->ro._s_addr = NULL;
4594                                         }
4595                                         net->src_addr_selected = 0;
4596                                 }
4597                                 if ((ro->ro_rt != NULL) && (net->ro._s_addr) &&
4598                                     ((net->dest_state & SCTP_ADDR_NO_PMTUD) == 0)) {
4599                                         uint32_t mtu;
4600
4601                                         mtu = SCTP_GATHER_MTU_FROM_ROUTE(net->ro._s_addr, &net->ro._l_addr.sa, ro->ro_rt);
4602                                         if (mtu > 0) {
4603                                                 if (net->port) {
4604                                                         mtu -= sizeof(struct udphdr);
4605                                                 }
4606                                                 if (mtu < net->mtu) {
4607                                                         if ((stcb != NULL) && (stcb->asoc.smallest_mtu > mtu)) {
4608                                                                 sctp_mtu_size_reset(inp, &stcb->asoc, mtu);
4609                                                         }
4610                                                         net->mtu = mtu;
4611                                                 }
4612                                         }
4613                                 } else if (ifp) {
4614                                         if (ND_IFINFO(ifp)->linkmtu &&
4615                                             (stcb->asoc.smallest_mtu > ND_IFINFO(ifp)->linkmtu)) {
4616                                                 sctp_mtu_size_reset(inp,
4617                                                     &stcb->asoc,
4618                                                     ND_IFINFO(ifp)->linkmtu);
4619                                         }
4620                                 }
4621                         }
4622                         return (ret);
4623                 }
4624 #endif
4625         default:
4626                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Unknown protocol (TSNH) type %d\n",
4627                     ((struct sockaddr *)to)->sa_family);
4628                 sctp_m_freem(m);
4629                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EFAULT);
4630                 return (EFAULT);
4631         }
4632 }
4633
4634
4635 void
4636 sctp_send_initiate(struct sctp_inpcb *inp, struct sctp_tcb *stcb, int so_locked)
4637 {
4638         struct mbuf *m, *m_last;
4639         struct sctp_nets *net;
4640         struct sctp_init_chunk *init;
4641         struct sctp_supported_addr_param *sup_addr;
4642         struct sctp_adaptation_layer_indication *ali;
4643         struct sctp_supported_chunk_types_param *pr_supported;
4644         struct sctp_paramhdr *ph;
4645         int cnt_inits_to = 0;
4646         int error;
4647         uint16_t num_ext, chunk_len, padding_len, parameter_len;
4648
4649         /* INIT's always go to the primary (and usually ONLY address) */
4650         net = stcb->asoc.primary_destination;
4651         if (net == NULL) {
4652                 net = TAILQ_FIRST(&stcb->asoc.nets);
4653                 if (net == NULL) {
4654                         /* TSNH */
4655                         return;
4656                 }
4657                 /* we confirm any address we send an INIT to */
4658                 net->dest_state &= ~SCTP_ADDR_UNCONFIRMED;
4659                 (void)sctp_set_primary_addr(stcb, NULL, net);
4660         } else {
4661                 /* we confirm any address we send an INIT to */
4662                 net->dest_state &= ~SCTP_ADDR_UNCONFIRMED;
4663         }
4664         SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT\n");
4665 #ifdef INET6
4666         if (net->ro._l_addr.sa.sa_family == AF_INET6) {
4667                 /*
4668                  * special hook, if we are sending to link local it will not
4669                  * show up in our private address count.
4670                  */
4671                 if (IN6_IS_ADDR_LINKLOCAL(&net->ro._l_addr.sin6.sin6_addr))
4672                         cnt_inits_to = 1;
4673         }
4674 #endif
4675         if (SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
4676                 /* This case should not happen */
4677                 SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT - failed timer?\n");
4678                 return;
4679         }
4680         /* start the INIT timer */
4681         sctp_timer_start(SCTP_TIMER_TYPE_INIT, inp, stcb, net);
4682
4683         m = sctp_get_mbuf_for_msg(MCLBYTES, 1, M_NOWAIT, 1, MT_DATA);
4684         if (m == NULL) {
4685                 /* No memory, INIT timer will re-attempt. */
4686                 SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT - mbuf?\n");
4687                 return;
4688         }
4689         chunk_len = (uint16_t)sizeof(struct sctp_init_chunk);
4690         padding_len = 0;
4691         /* Now lets put the chunk header in place */
4692         init = mtod(m, struct sctp_init_chunk *);
4693         /* now the chunk header */
4694         init->ch.chunk_type = SCTP_INITIATION;
4695         init->ch.chunk_flags = 0;
4696         /* fill in later from mbuf we build */
4697         init->ch.chunk_length = 0;
4698         /* place in my tag */
4699         init->init.initiate_tag = htonl(stcb->asoc.my_vtag);
4700         /* set up some of the credits. */
4701         init->init.a_rwnd = htonl(max(inp->sctp_socket ? SCTP_SB_LIMIT_RCV(inp->sctp_socket) : 0,
4702             SCTP_MINIMAL_RWND));
4703         init->init.num_outbound_streams = htons(stcb->asoc.pre_open_streams);
4704         init->init.num_inbound_streams = htons(stcb->asoc.max_inbound_streams);
4705         init->init.initial_tsn = htonl(stcb->asoc.init_seq_number);
4706
4707         /* Adaptation layer indication parameter */
4708         if (inp->sctp_ep.adaptation_layer_indicator_provided) {
4709                 parameter_len = (uint16_t)sizeof(struct sctp_adaptation_layer_indication);
4710                 ali = (struct sctp_adaptation_layer_indication *)(mtod(m, caddr_t)+chunk_len);
4711                 ali->ph.param_type = htons(SCTP_ULP_ADAPTATION);
4712                 ali->ph.param_length = htons(parameter_len);
4713                 ali->indication = htonl(inp->sctp_ep.adaptation_layer_indicator);
4714                 chunk_len += parameter_len;
4715         }
4716
4717         /* ECN parameter */
4718         if (stcb->asoc.ecn_supported == 1) {
4719                 parameter_len = (uint16_t)sizeof(struct sctp_paramhdr);
4720                 ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
4721                 ph->param_type = htons(SCTP_ECN_CAPABLE);
4722                 ph->param_length = htons(parameter_len);
4723                 chunk_len += parameter_len;
4724         }
4725
4726         /* PR-SCTP supported parameter */
4727         if (stcb->asoc.prsctp_supported == 1) {
4728                 parameter_len = (uint16_t)sizeof(struct sctp_paramhdr);
4729                 ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
4730                 ph->param_type = htons(SCTP_PRSCTP_SUPPORTED);
4731                 ph->param_length = htons(parameter_len);
4732                 chunk_len += parameter_len;
4733         }
4734
4735         /* Add NAT friendly parameter. */
4736         if (SCTP_BASE_SYSCTL(sctp_inits_include_nat_friendly)) {
4737                 parameter_len = (uint16_t)sizeof(struct sctp_paramhdr);
4738                 ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
4739                 ph->param_type = htons(SCTP_HAS_NAT_SUPPORT);
4740                 ph->param_length = htons(parameter_len);
4741                 chunk_len += parameter_len;
4742         }
4743
4744         /* And now tell the peer which extensions we support */
4745         num_ext = 0;
4746         pr_supported = (struct sctp_supported_chunk_types_param *)(mtod(m, caddr_t)+chunk_len);
4747         if (stcb->asoc.prsctp_supported == 1) {
4748                 pr_supported->chunk_types[num_ext++] = SCTP_FORWARD_CUM_TSN;
4749                 if (stcb->asoc.idata_supported) {
4750                         pr_supported->chunk_types[num_ext++] = SCTP_IFORWARD_CUM_TSN;
4751                 }
4752         }
4753         if (stcb->asoc.auth_supported == 1) {
4754                 pr_supported->chunk_types[num_ext++] = SCTP_AUTHENTICATION;
4755         }
4756         if (stcb->asoc.asconf_supported == 1) {
4757                 pr_supported->chunk_types[num_ext++] = SCTP_ASCONF;
4758                 pr_supported->chunk_types[num_ext++] = SCTP_ASCONF_ACK;
4759         }
4760         if (stcb->asoc.reconfig_supported == 1) {
4761                 pr_supported->chunk_types[num_ext++] = SCTP_STREAM_RESET;
4762         }
4763         if (stcb->asoc.idata_supported) {
4764                 pr_supported->chunk_types[num_ext++] = SCTP_IDATA;
4765         }
4766         if (stcb->asoc.nrsack_supported == 1) {
4767                 pr_supported->chunk_types[num_ext++] = SCTP_NR_SELECTIVE_ACK;
4768         }
4769         if (stcb->asoc.pktdrop_supported == 1) {
4770                 pr_supported->chunk_types[num_ext++] = SCTP_PACKET_DROPPED;
4771         }
4772         if (num_ext > 0) {
4773                 parameter_len = (uint16_t)sizeof(struct sctp_supported_chunk_types_param) + num_ext;
4774                 pr_supported->ph.param_type = htons(SCTP_SUPPORTED_CHUNK_EXT);
4775                 pr_supported->ph.param_length = htons(parameter_len);
4776                 padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
4777                 chunk_len += parameter_len;
4778         }
4779         /* add authentication parameters */
4780         if (stcb->asoc.auth_supported) {
4781                 /* attach RANDOM parameter, if available */
4782                 if (stcb->asoc.authinfo.random != NULL) {
4783                         struct sctp_auth_random *randp;
4784
4785                         if (padding_len > 0) {
4786                                 memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
4787                                 chunk_len += padding_len;
4788                                 padding_len = 0;
4789                         }
4790                         randp = (struct sctp_auth_random *)(mtod(m, caddr_t)+chunk_len);
4791                         parameter_len = (uint16_t)sizeof(struct sctp_auth_random) + stcb->asoc.authinfo.random_len;
4792                         /* random key already contains the header */
4793                         memcpy(randp, stcb->asoc.authinfo.random->key, parameter_len);
4794                         padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
4795                         chunk_len += parameter_len;
4796                 }
4797                 /* add HMAC_ALGO parameter */
4798                 if (stcb->asoc.local_hmacs != NULL) {
4799                         struct sctp_auth_hmac_algo *hmacs;
4800
4801                         if (padding_len > 0) {
4802                                 memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
4803                                 chunk_len += padding_len;
4804                                 padding_len = 0;
4805                         }
4806                         hmacs = (struct sctp_auth_hmac_algo *)(mtod(m, caddr_t)+chunk_len);
4807                         parameter_len = (uint16_t)(sizeof(struct sctp_auth_hmac_algo) +
4808                             stcb->asoc.local_hmacs->num_algo * sizeof(uint16_t));
4809                         hmacs->ph.param_type = htons(SCTP_HMAC_LIST);
4810                         hmacs->ph.param_length = htons(parameter_len);
4811                         sctp_serialize_hmaclist(stcb->asoc.local_hmacs, (uint8_t *)hmacs->hmac_ids);
4812                         padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
4813                         chunk_len += parameter_len;
4814                 }
4815                 /* add CHUNKS parameter */
4816                 if (stcb->asoc.local_auth_chunks != NULL) {
4817                         struct sctp_auth_chunk_list *chunks;
4818
4819                         if (padding_len > 0) {
4820                                 memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
4821                                 chunk_len += padding_len;
4822                                 padding_len = 0;
4823                         }
4824                         chunks = (struct sctp_auth_chunk_list *)(mtod(m, caddr_t)+chunk_len);
4825                         parameter_len = (uint16_t)(sizeof(struct sctp_auth_chunk_list) +
4826                             sctp_auth_get_chklist_size(stcb->asoc.local_auth_chunks));
4827                         chunks->ph.param_type = htons(SCTP_CHUNK_LIST);
4828                         chunks->ph.param_length = htons(parameter_len);
4829                         sctp_serialize_auth_chunks(stcb->asoc.local_auth_chunks, chunks->chunk_types);
4830                         padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
4831                         chunk_len += parameter_len;
4832                 }
4833         }
4834
4835         /* now any cookie time extensions */
4836         if (stcb->asoc.cookie_preserve_req > 0) {
4837                 struct sctp_cookie_perserve_param *cookie_preserve;
4838
4839                 if (padding_len > 0) {
4840                         memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
4841                         chunk_len += padding_len;
4842                         padding_len = 0;
4843                 }
4844                 parameter_len = (uint16_t)sizeof(struct sctp_cookie_perserve_param);
4845                 cookie_preserve = (struct sctp_cookie_perserve_param *)(mtod(m, caddr_t)+chunk_len);
4846                 cookie_preserve->ph.param_type = htons(SCTP_COOKIE_PRESERVE);
4847                 cookie_preserve->ph.param_length = htons(parameter_len);
4848                 cookie_preserve->time = htonl(stcb->asoc.cookie_preserve_req);
4849                 stcb->asoc.cookie_preserve_req = 0;
4850                 chunk_len += parameter_len;
4851         }
4852
4853         if (stcb->asoc.scope.ipv4_addr_legal || stcb->asoc.scope.ipv6_addr_legal) {
4854                 uint8_t i;
4855
4856                 if (padding_len > 0) {
4857                         memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
4858                         chunk_len += padding_len;
4859                         padding_len = 0;
4860                 }
4861                 parameter_len = (uint16_t)sizeof(struct sctp_paramhdr);
4862                 if (stcb->asoc.scope.ipv4_addr_legal) {
4863                         parameter_len += (uint16_t)sizeof(uint16_t);
4864                 }
4865                 if (stcb->asoc.scope.ipv6_addr_legal) {
4866                         parameter_len += (uint16_t)sizeof(uint16_t);
4867                 }
4868                 sup_addr = (struct sctp_supported_addr_param *)(mtod(m, caddr_t)+chunk_len);
4869                 sup_addr->ph.param_type = htons(SCTP_SUPPORTED_ADDRTYPE);
4870                 sup_addr->ph.param_length = htons(parameter_len);
4871                 i = 0;
4872                 if (stcb->asoc.scope.ipv4_addr_legal) {
4873                         sup_addr->addr_type[i++] = htons(SCTP_IPV4_ADDRESS);
4874                 }
4875                 if (stcb->asoc.scope.ipv6_addr_legal) {
4876                         sup_addr->addr_type[i++] = htons(SCTP_IPV6_ADDRESS);
4877                 }
4878                 padding_len = 4 - 2 * i;
4879                 chunk_len += parameter_len;
4880         }
4881
4882         SCTP_BUF_LEN(m) = chunk_len;
4883         /* now the addresses */
4884         /*
4885          * To optimize this we could put the scoping stuff into a structure
4886          * and remove the individual uint8's from the assoc structure. Then
4887          * we could just sifa in the address within the stcb. But for now
4888          * this is a quick hack to get the address stuff teased apart.
4889          */
4890         m_last = sctp_add_addresses_to_i_ia(inp, stcb, &stcb->asoc.scope,
4891             m, cnt_inits_to,
4892             &padding_len, &chunk_len);
4893
4894         init->ch.chunk_length = htons(chunk_len);
4895         if (padding_len > 0) {
4896                 if (sctp_add_pad_tombuf(m_last, padding_len) == NULL) {
4897                         sctp_m_freem(m);
4898                         return;
4899                 }
4900         }
4901         SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT - calls lowlevel_output\n");
4902         if ((error = sctp_lowlevel_chunk_output(inp, stcb, net,
4903             (struct sockaddr *)&net->ro._l_addr,
4904             m, 0, NULL, 0, 0, 0, 0,
4905             inp->sctp_lport, stcb->rport, htonl(0),
4906             net->port, NULL,
4907             0, 0,
4908             so_locked))) {
4909                 SCTPDBG(SCTP_DEBUG_OUTPUT4, "Gak send error %d\n", error);
4910                 if (error == ENOBUFS) {
4911                         stcb->asoc.ifp_had_enobuf = 1;
4912                         SCTP_STAT_INCR(sctps_lowlevelerr);
4913                 }
4914         } else {
4915                 stcb->asoc.ifp_had_enobuf = 0;
4916         }
4917         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
4918         (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
4919 }
4920
4921 struct mbuf *
4922 sctp_arethere_unrecognized_parameters(struct mbuf *in_initpkt,
4923     int param_offset, int *abort_processing,
4924     struct sctp_chunkhdr *cp,
4925     int *nat_friendly,
4926     int *cookie_found)
4927 {
4928         /*
4929          * Given a mbuf containing an INIT or INIT-ACK with the param_offset
4930          * being equal to the beginning of the params i.e. (iphlen +
4931          * sizeof(struct sctp_init_msg) parse through the parameters to the
4932          * end of the mbuf verifying that all parameters are known.
4933          *
4934          * For unknown parameters build and return a mbuf with
4935          * UNRECOGNIZED_PARAMETER errors. If the flags indicate to stop
4936          * processing this chunk stop, and set *abort_processing to 1.
4937          *
4938          * By having param_offset be pre-set to where parameters begin it is
4939          * hoped that this routine may be reused in the future by new
4940          * features.
4941          */
4942         struct sctp_paramhdr *phdr, params;
4943
4944         struct mbuf *mat, *m_tmp, *op_err, *op_err_last;
4945         int at, limit, pad_needed;
4946         uint16_t ptype, plen, padded_size;
4947
4948         *abort_processing = 0;
4949         if (cookie_found != NULL) {
4950                 *cookie_found = 0;
4951         }
4952         mat = in_initpkt;
4953         limit = ntohs(cp->chunk_length) - sizeof(struct sctp_init_chunk);
4954         at = param_offset;
4955         op_err = NULL;
4956         op_err_last = NULL;
4957         pad_needed = 0;
4958         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Check for unrecognized param's\n");
4959         phdr = sctp_get_next_param(mat, at, &params, sizeof(params));
4960         while ((phdr != NULL) && ((size_t)limit >= sizeof(struct sctp_paramhdr))) {
4961                 ptype = ntohs(phdr->param_type);
4962                 plen = ntohs(phdr->param_length);
4963                 if ((plen > limit) || (plen < sizeof(struct sctp_paramhdr))) {
4964                         /* wacked parameter */
4965                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error %d\n", plen);
4966                         goto invalid_size;
4967                 }
4968                 limit -= SCTP_SIZE32(plen);
4969                 /*-
4970                  * All parameters for all chunks that we know/understand are
4971                  * listed here. We process them other places and make
4972                  * appropriate stop actions per the upper bits. However this
4973                  * is the generic routine processor's can call to get back
4974                  * an operr.. to either incorporate (init-ack) or send.
4975                  */
4976                 padded_size = SCTP_SIZE32(plen);
4977                 switch (ptype) {
4978                         /* Param's with variable size */
4979                 case SCTP_HEARTBEAT_INFO:
4980                 case SCTP_UNRECOG_PARAM:
4981                 case SCTP_ERROR_CAUSE_IND:
4982                         /* ok skip fwd */
4983                         at += padded_size;
4984                         break;
4985                 case SCTP_STATE_COOKIE:
4986                         if (cookie_found != NULL) {
4987                                 *cookie_found = 1;
4988                         }
4989                         at += padded_size;
4990                         break;
4991                         /* Param's with variable size within a range */
4992                 case SCTP_CHUNK_LIST:
4993                 case SCTP_SUPPORTED_CHUNK_EXT:
4994                         if (padded_size > (sizeof(struct sctp_supported_chunk_types_param) + (sizeof(uint8_t) * SCTP_MAX_SUPPORTED_EXT))) {
4995                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error chklist %d\n", plen);
4996                                 goto invalid_size;
4997                         }
4998                         at += padded_size;
4999                         break;
5000                 case SCTP_SUPPORTED_ADDRTYPE:
5001                         if (padded_size > SCTP_MAX_ADDR_PARAMS_SIZE) {
5002                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error supaddrtype %d\n", plen);
5003                                 goto invalid_size;
5004                         }
5005                         at += padded_size;
5006                         break;
5007                 case SCTP_RANDOM:
5008                         if (padded_size > (sizeof(struct sctp_auth_random) + SCTP_RANDOM_MAX_SIZE)) {
5009                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error random %d\n", plen);
5010                                 goto invalid_size;
5011                         }
5012                         at += padded_size;
5013                         break;
5014                 case SCTP_SET_PRIM_ADDR:
5015                 case SCTP_DEL_IP_ADDRESS:
5016                 case SCTP_ADD_IP_ADDRESS:
5017                         if ((padded_size != sizeof(struct sctp_asconf_addrv4_param)) &&
5018                             (padded_size != sizeof(struct sctp_asconf_addr_param))) {
5019                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error setprim %d\n", plen);
5020                                 goto invalid_size;
5021                         }
5022                         at += padded_size;
5023                         break;
5024                         /* Param's with a fixed size */
5025                 case SCTP_IPV4_ADDRESS:
5026                         if (padded_size != sizeof(struct sctp_ipv4addr_param)) {
5027                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error ipv4 addr %d\n", plen);
5028                                 goto invalid_size;
5029                         }
5030                         at += padded_size;
5031                         break;
5032                 case SCTP_IPV6_ADDRESS:
5033                         if (padded_size != sizeof(struct sctp_ipv6addr_param)) {
5034                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error ipv6 addr %d\n", plen);
5035                                 goto invalid_size;
5036                         }
5037                         at += padded_size;
5038                         break;
5039                 case SCTP_COOKIE_PRESERVE:
5040                         if (padded_size != sizeof(struct sctp_cookie_perserve_param)) {
5041                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error cookie-preserve %d\n", plen);
5042                                 goto invalid_size;
5043                         }
5044                         at += padded_size;
5045                         break;
5046                 case SCTP_HAS_NAT_SUPPORT:
5047                         *nat_friendly = 1;
5048                         /* fall through */
5049                 case SCTP_PRSCTP_SUPPORTED:
5050                         if (padded_size != sizeof(struct sctp_paramhdr)) {
5051                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error prsctp/nat support %d\n", plen);
5052                                 goto invalid_size;
5053                         }
5054                         at += padded_size;
5055                         break;
5056                 case SCTP_ECN_CAPABLE:
5057                         if (padded_size != sizeof(struct sctp_paramhdr)) {
5058                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error ecn %d\n", plen);
5059                                 goto invalid_size;
5060                         }
5061                         at += padded_size;
5062                         break;
5063                 case SCTP_ULP_ADAPTATION:
5064                         if (padded_size != sizeof(struct sctp_adaptation_layer_indication)) {
5065                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error adapatation %d\n", plen);
5066                                 goto invalid_size;
5067                         }
5068                         at += padded_size;
5069                         break;
5070                 case SCTP_SUCCESS_REPORT:
5071                         if (padded_size != sizeof(struct sctp_asconf_paramhdr)) {
5072                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error success %d\n", plen);
5073                                 goto invalid_size;
5074                         }
5075                         at += padded_size;
5076                         break;
5077                 case SCTP_HOSTNAME_ADDRESS:
5078                         {
5079                                 /* Hostname parameters are deprecated. */
5080                                 struct sctp_gen_error_cause *cause;
5081                                 int l_len;
5082
5083                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Can't handle hostname addresses.. abort processing\n");
5084                                 *abort_processing = 1;
5085                                 sctp_m_freem(op_err);
5086                                 op_err = NULL;
5087                                 op_err_last = NULL;
5088 #ifdef INET6
5089                                 l_len = SCTP_MIN_OVERHEAD;
5090 #else
5091                                 l_len = SCTP_MIN_V4_OVERHEAD;
5092 #endif
5093                                 l_len += sizeof(struct sctp_chunkhdr);
5094                                 l_len += sizeof(struct sctp_gen_error_cause);
5095                                 op_err = sctp_get_mbuf_for_msg(l_len, 0, M_NOWAIT, 1, MT_DATA);
5096                                 if (op_err != NULL) {
5097                                         /*
5098                                          * Pre-reserve space for IP, SCTP,
5099                                          * and chunk header.
5100                                          */
5101 #ifdef INET6
5102                                         SCTP_BUF_RESV_UF(op_err, sizeof(struct ip6_hdr));
5103 #else
5104                                         SCTP_BUF_RESV_UF(op_err, sizeof(struct ip));
5105 #endif
5106                                         SCTP_BUF_RESV_UF(op_err, sizeof(struct sctphdr));
5107                                         SCTP_BUF_RESV_UF(op_err, sizeof(struct sctp_chunkhdr));
5108                                         SCTP_BUF_LEN(op_err) = sizeof(struct sctp_gen_error_cause);
5109                                         cause = mtod(op_err, struct sctp_gen_error_cause *);
5110                                         cause->code = htons(SCTP_CAUSE_UNRESOLVABLE_ADDR);
5111                                         cause->length = htons((uint16_t)(sizeof(struct sctp_gen_error_cause) + plen));
5112                                         SCTP_BUF_NEXT(op_err) = SCTP_M_COPYM(mat, at, plen, M_NOWAIT);
5113                                         if (SCTP_BUF_NEXT(op_err) == NULL) {
5114                                                 sctp_m_freem(op_err);
5115                                                 op_err = NULL;
5116                                                 op_err_last = NULL;
5117                                         }
5118                                 }
5119                                 return (op_err);
5120                         }
5121                 default:
5122                         /*
5123                          * we do not recognize the parameter figure out what
5124                          * we do.
5125                          */
5126                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Hit default param %x\n", ptype);
5127                         if ((ptype & 0x4000) == 0x4000) {
5128                                 /* Report bit is set?? */
5129                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "report op err\n");
5130                                 if (op_err == NULL) {
5131                                         int l_len;
5132
5133                                         /* Ok need to try to get an mbuf */
5134 #ifdef INET6
5135                                         l_len = SCTP_MIN_OVERHEAD;
5136 #else
5137                                         l_len = SCTP_MIN_V4_OVERHEAD;
5138 #endif
5139                                         l_len += sizeof(struct sctp_chunkhdr);
5140                                         l_len += sizeof(struct sctp_paramhdr);
5141                                         op_err = sctp_get_mbuf_for_msg(l_len, 0, M_NOWAIT, 1, MT_DATA);
5142                                         if (op_err) {
5143                                                 SCTP_BUF_LEN(op_err) = 0;
5144 #ifdef INET6
5145                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip6_hdr));
5146 #else
5147                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip));
5148 #endif
5149                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctphdr));
5150                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctp_chunkhdr));
5151                                                 op_err_last = op_err;
5152                                         }
5153                                 }
5154                                 if (op_err != NULL) {
5155                                         /* If we have space */
5156                                         struct sctp_paramhdr *param;
5157
5158                                         if (pad_needed > 0) {
5159                                                 op_err_last = sctp_add_pad_tombuf(op_err_last, pad_needed);
5160                                         }
5161                                         if (op_err_last == NULL) {
5162                                                 sctp_m_freem(op_err);
5163                                                 op_err = NULL;
5164                                                 op_err_last = NULL;
5165                                                 goto more_processing;
5166                                         }
5167                                         if (M_TRAILINGSPACE(op_err_last) < (int)sizeof(struct sctp_paramhdr)) {
5168                                                 m_tmp = sctp_get_mbuf_for_msg(sizeof(struct sctp_paramhdr), 0, M_NOWAIT, 1, MT_DATA);
5169                                                 if (m_tmp == NULL) {
5170                                                         sctp_m_freem(op_err);
5171                                                         op_err = NULL;
5172                                                         op_err_last = NULL;
5173                                                         goto more_processing;
5174                                                 }
5175                                                 SCTP_BUF_LEN(m_tmp) = 0;
5176                                                 SCTP_BUF_NEXT(m_tmp) = NULL;
5177                                                 SCTP_BUF_NEXT(op_err_last) = m_tmp;
5178                                                 op_err_last = m_tmp;
5179                                         }
5180                                         param = (struct sctp_paramhdr *)(mtod(op_err_last, caddr_t)+SCTP_BUF_LEN(op_err_last));
5181                                         param->param_type = htons(SCTP_UNRECOG_PARAM);
5182                                         param->param_length = htons((uint16_t)sizeof(struct sctp_paramhdr) + plen);
5183                                         SCTP_BUF_LEN(op_err_last) += sizeof(struct sctp_paramhdr);
5184                                         SCTP_BUF_NEXT(op_err_last) = SCTP_M_COPYM(mat, at, plen, M_NOWAIT);
5185                                         if (SCTP_BUF_NEXT(op_err_last) == NULL) {
5186                                                 sctp_m_freem(op_err);
5187                                                 op_err = NULL;
5188                                                 op_err_last = NULL;
5189                                                 goto more_processing;
5190                                         } else {
5191                                                 while (SCTP_BUF_NEXT(op_err_last) != NULL) {
5192                                                         op_err_last = SCTP_BUF_NEXT(op_err_last);
5193                                                 }
5194                                         }
5195                                         if (plen % 4 != 0) {
5196                                                 pad_needed = 4 - (plen % 4);
5197                                         } else {
5198                                                 pad_needed = 0;
5199                                         }
5200                                 }
5201                         }
5202         more_processing:
5203                         if ((ptype & 0x8000) == 0x0000) {
5204                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "stop proc\n");
5205                                 return (op_err);
5206                         } else {
5207                                 /* skip this chunk and continue processing */
5208                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "move on\n");
5209                                 at += SCTP_SIZE32(plen);
5210                         }
5211                         break;
5212
5213                 }
5214                 phdr = sctp_get_next_param(mat, at, &params, sizeof(params));
5215         }
5216         return (op_err);
5217 invalid_size:
5218         SCTPDBG(SCTP_DEBUG_OUTPUT1, "abort flag set\n");
5219         *abort_processing = 1;
5220         sctp_m_freem(op_err);
5221         op_err = NULL;
5222         op_err_last = NULL;
5223         if (phdr != NULL) {
5224                 struct sctp_paramhdr *param;
5225                 int l_len;
5226 #ifdef INET6
5227                 l_len = SCTP_MIN_OVERHEAD;
5228 #else
5229                 l_len = SCTP_MIN_V4_OVERHEAD;
5230 #endif
5231                 l_len += sizeof(struct sctp_chunkhdr);
5232                 l_len += (2 * sizeof(struct sctp_paramhdr));
5233                 op_err = sctp_get_mbuf_for_msg(l_len, 0, M_NOWAIT, 1, MT_DATA);
5234                 if (op_err) {
5235                         SCTP_BUF_LEN(op_err) = 0;
5236 #ifdef INET6
5237                         SCTP_BUF_RESV_UF(op_err, sizeof(struct ip6_hdr));
5238 #else
5239                         SCTP_BUF_RESV_UF(op_err, sizeof(struct ip));
5240 #endif
5241                         SCTP_BUF_RESV_UF(op_err, sizeof(struct sctphdr));
5242                         SCTP_BUF_RESV_UF(op_err, sizeof(struct sctp_chunkhdr));
5243                         SCTP_BUF_LEN(op_err) = 2 * sizeof(struct sctp_paramhdr);
5244                         param = mtod(op_err, struct sctp_paramhdr *);
5245                         param->param_type = htons(SCTP_CAUSE_PROTOCOL_VIOLATION);
5246                         param->param_length = htons(2 * sizeof(struct sctp_paramhdr));
5247                         param++;
5248                         param->param_type = htons(ptype);
5249                         param->param_length = htons(plen);
5250                 }
5251         }
5252         return (op_err);
5253 }
5254
5255 static int
5256 sctp_are_there_new_addresses(struct sctp_association *asoc,
5257     struct mbuf *in_initpkt, int offset, struct sockaddr *src)
5258 {
5259         /*
5260          * Given a INIT packet, look through the packet to verify that there
5261          * are NO new addresses. As we go through the parameters add reports
5262          * of any un-understood parameters that require an error.  Also we
5263          * must return (1) to drop the packet if we see a un-understood
5264          * parameter that tells us to drop the chunk.
5265          */
5266         struct sockaddr *sa_touse;
5267         struct sockaddr *sa;
5268         struct sctp_paramhdr *phdr, params;
5269         uint16_t ptype, plen;
5270         uint8_t fnd;
5271         struct sctp_nets *net;
5272         int check_src;
5273 #ifdef INET
5274         struct sockaddr_in sin4, *sa4;
5275 #endif
5276 #ifdef INET6
5277         struct sockaddr_in6 sin6, *sa6;
5278 #endif
5279
5280 #ifdef INET
5281         memset(&sin4, 0, sizeof(sin4));
5282         sin4.sin_family = AF_INET;
5283         sin4.sin_len = sizeof(sin4);
5284 #endif
5285 #ifdef INET6
5286         memset(&sin6, 0, sizeof(sin6));
5287         sin6.sin6_family = AF_INET6;
5288         sin6.sin6_len = sizeof(sin6);
5289 #endif
5290         /* First what about the src address of the pkt ? */
5291         check_src = 0;
5292         switch (src->sa_family) {
5293 #ifdef INET
5294         case AF_INET:
5295                 if (asoc->scope.ipv4_addr_legal) {
5296                         check_src = 1;
5297                 }
5298                 break;
5299 #endif
5300 #ifdef INET6
5301         case AF_INET6:
5302                 if (asoc->scope.ipv6_addr_legal) {
5303                         check_src = 1;
5304                 }
5305                 break;
5306 #endif
5307         default:
5308                 /* TSNH */
5309                 break;
5310         }
5311         if (check_src) {
5312                 fnd = 0;
5313                 TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
5314                         sa = (struct sockaddr *)&net->ro._l_addr;
5315                         if (sa->sa_family == src->sa_family) {
5316 #ifdef INET
5317                                 if (sa->sa_family == AF_INET) {
5318                                         struct sockaddr_in *src4;
5319
5320                                         sa4 = (struct sockaddr_in *)sa;
5321                                         src4 = (struct sockaddr_in *)src;
5322                                         if (sa4->sin_addr.s_addr == src4->sin_addr.s_addr) {
5323                                                 fnd = 1;
5324                                                 break;
5325                                         }
5326                                 }
5327 #endif
5328 #ifdef INET6
5329                                 if (sa->sa_family == AF_INET6) {
5330                                         struct sockaddr_in6 *src6;
5331
5332                                         sa6 = (struct sockaddr_in6 *)sa;
5333                                         src6 = (struct sockaddr_in6 *)src;
5334                                         if (SCTP6_ARE_ADDR_EQUAL(sa6, src6)) {
5335                                                 fnd = 1;
5336                                                 break;
5337                                         }
5338                                 }
5339 #endif
5340                         }
5341                 }
5342                 if (fnd == 0) {
5343                         /* New address added! no need to look further. */
5344                         return (1);
5345                 }
5346         }
5347         /* Ok so far lets munge through the rest of the packet */
5348         offset += sizeof(struct sctp_init_chunk);
5349         phdr = sctp_get_next_param(in_initpkt, offset, &params, sizeof(params));
5350         while (phdr) {
5351                 sa_touse = NULL;
5352                 ptype = ntohs(phdr->param_type);
5353                 plen = ntohs(phdr->param_length);
5354                 switch (ptype) {
5355 #ifdef INET
5356                 case SCTP_IPV4_ADDRESS:
5357                         {
5358                                 struct sctp_ipv4addr_param *p4, p4_buf;
5359
5360                                 if (plen != sizeof(struct sctp_ipv4addr_param)) {
5361                                         return (1);
5362                                 }
5363                                 phdr = sctp_get_next_param(in_initpkt, offset,
5364                                     (struct sctp_paramhdr *)&p4_buf, sizeof(p4_buf));
5365                                 if (phdr == NULL) {
5366                                         return (1);
5367                                 }
5368                                 if (asoc->scope.ipv4_addr_legal) {
5369                                         p4 = (struct sctp_ipv4addr_param *)phdr;
5370                                         sin4.sin_addr.s_addr = p4->addr;
5371                                         sa_touse = (struct sockaddr *)&sin4;
5372                                 }
5373                                 break;
5374                         }
5375 #endif
5376 #ifdef INET6
5377                 case SCTP_IPV6_ADDRESS:
5378                         {
5379                                 struct sctp_ipv6addr_param *p6, p6_buf;
5380
5381                                 if (plen != sizeof(struct sctp_ipv6addr_param)) {
5382                                         return (1);
5383                                 }
5384                                 phdr = sctp_get_next_param(in_initpkt, offset,
5385                                     (struct sctp_paramhdr *)&p6_buf, sizeof(p6_buf));
5386                                 if (phdr == NULL) {
5387                                         return (1);
5388                                 }
5389                                 if (asoc->scope.ipv6_addr_legal) {
5390                                         p6 = (struct sctp_ipv6addr_param *)phdr;
5391                                         memcpy((caddr_t)&sin6.sin6_addr, p6->addr,
5392                                             sizeof(p6->addr));
5393                                         sa_touse = (struct sockaddr *)&sin6;
5394                                 }
5395                                 break;
5396                         }
5397 #endif
5398                 default:
5399                         sa_touse = NULL;
5400                         break;
5401                 }
5402                 if (sa_touse) {
5403                         /* ok, sa_touse points to one to check */
5404                         fnd = 0;
5405                         TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
5406                                 sa = (struct sockaddr *)&net->ro._l_addr;
5407                                 if (sa->sa_family != sa_touse->sa_family) {
5408                                         continue;
5409                                 }
5410 #ifdef INET
5411                                 if (sa->sa_family == AF_INET) {
5412                                         sa4 = (struct sockaddr_in *)sa;
5413                                         if (sa4->sin_addr.s_addr ==
5414                                             sin4.sin_addr.s_addr) {
5415                                                 fnd = 1;
5416                                                 break;
5417                                         }
5418                                 }
5419 #endif
5420 #ifdef INET6
5421                                 if (sa->sa_family == AF_INET6) {
5422                                         sa6 = (struct sockaddr_in6 *)sa;
5423                                         if (SCTP6_ARE_ADDR_EQUAL(
5424                                             sa6, &sin6)) {
5425                                                 fnd = 1;
5426                                                 break;
5427                                         }
5428                                 }
5429 #endif
5430                         }
5431                         if (!fnd) {
5432                                 /* New addr added! no need to look further */
5433                                 return (1);
5434                         }
5435                 }
5436                 offset += SCTP_SIZE32(plen);
5437                 phdr = sctp_get_next_param(in_initpkt, offset, &params, sizeof(params));
5438         }
5439         return (0);
5440 }
5441
5442 /*
5443  * Given a MBUF chain that was sent into us containing an INIT. Build a
5444  * INIT-ACK with COOKIE and send back. We assume that the in_initpkt has done
5445  * a pullup to include IPv6/4header, SCTP header and initial part of INIT
5446  * message (i.e. the struct sctp_init_msg).
5447  */
5448 void
5449 sctp_send_initiate_ack(struct sctp_inpcb *inp, struct sctp_tcb *stcb,
5450     struct sctp_nets *src_net, struct mbuf *init_pkt,
5451     int iphlen, int offset,
5452     struct sockaddr *src, struct sockaddr *dst,
5453     struct sctphdr *sh, struct sctp_init_chunk *init_chk,
5454     uint8_t mflowtype, uint32_t mflowid,
5455     uint32_t vrf_id, uint16_t port)
5456 {
5457         struct sctp_association *asoc;
5458         struct mbuf *m, *m_tmp, *m_last, *m_cookie, *op_err;
5459         struct sctp_init_ack_chunk *initack;
5460         struct sctp_adaptation_layer_indication *ali;
5461         struct sctp_supported_chunk_types_param *pr_supported;
5462         struct sctp_paramhdr *ph;
5463         union sctp_sockstore *over_addr;
5464         struct sctp_scoping scp;
5465         struct timeval now;
5466 #ifdef INET
5467         struct sockaddr_in *dst4 = (struct sockaddr_in *)dst;
5468         struct sockaddr_in *src4 = (struct sockaddr_in *)src;
5469         struct sockaddr_in *sin;
5470 #endif
5471 #ifdef INET6
5472         struct sockaddr_in6 *dst6 = (struct sockaddr_in6 *)dst;
5473         struct sockaddr_in6 *src6 = (struct sockaddr_in6 *)src;
5474         struct sockaddr_in6 *sin6;
5475 #endif
5476         struct sockaddr *to;
5477         struct sctp_state_cookie stc;
5478         struct sctp_nets *net = NULL;
5479         uint8_t *signature = NULL;
5480         int cnt_inits_to = 0;
5481         uint16_t his_limit, i_want;
5482         int abort_flag;
5483         int nat_friendly = 0;
5484         int error;
5485         struct socket *so;
5486         uint16_t num_ext, chunk_len, padding_len, parameter_len;
5487
5488         if (stcb) {
5489                 asoc = &stcb->asoc;
5490         } else {
5491                 asoc = NULL;
5492         }
5493         if ((asoc != NULL) &&
5494             (SCTP_GET_STATE(stcb) != SCTP_STATE_COOKIE_WAIT)) {
5495                 if (sctp_are_there_new_addresses(asoc, init_pkt, offset, src)) {
5496                         /*
5497                          * new addresses, out of here in non-cookie-wait
5498                          * states
5499                          *
5500                          * Send an ABORT, without the new address error
5501                          * cause. This looks no different than if no
5502                          * listener was present.
5503                          */
5504                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
5505                             "Address added");
5506                         sctp_send_abort(init_pkt, iphlen, src, dst, sh, 0, op_err,
5507                             mflowtype, mflowid, inp->fibnum,
5508                             vrf_id, port);
5509                         return;
5510                 }
5511                 if (src_net != NULL && (src_net->port != port)) {
5512                         /*
5513                          * change of remote encapsulation port, out of here
5514                          * in non-cookie-wait states
5515                          *
5516                          * Send an ABORT, without an specific error cause.
5517                          * This looks no different than if no listener was
5518                          * present.
5519                          */
5520                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
5521                             "Remote encapsulation port changed");
5522                         sctp_send_abort(init_pkt, iphlen, src, dst, sh, 0, op_err,
5523                             mflowtype, mflowid, inp->fibnum,
5524                             vrf_id, port);
5525                         return;
5526                 }
5527         }
5528         abort_flag = 0;
5529         op_err = sctp_arethere_unrecognized_parameters(init_pkt,
5530             (offset + sizeof(struct sctp_init_chunk)),
5531             &abort_flag,
5532             (struct sctp_chunkhdr *)init_chk,
5533             &nat_friendly, NULL);
5534         if (abort_flag) {
5535 do_a_abort:
5536                 if (op_err == NULL) {
5537                         char msg[SCTP_DIAG_INFO_LEN];
5538
5539                         SCTP_SNPRINTF(msg, sizeof(msg), "%s:%d at %s", __FILE__, __LINE__, __func__);
5540                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
5541                             msg);
5542                 }
5543                 sctp_send_abort(init_pkt, iphlen, src, dst, sh,
5544                     init_chk->init.initiate_tag, op_err,
5545                     mflowtype, mflowid, inp->fibnum,
5546                     vrf_id, port);
5547                 return;
5548         }
5549         m = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
5550         if (m == NULL) {
5551                 /* No memory, INIT timer will re-attempt. */
5552                 sctp_m_freem(op_err);
5553                 return;
5554         }
5555         chunk_len = (uint16_t)sizeof(struct sctp_init_ack_chunk);
5556         padding_len = 0;
5557
5558         /*
5559          * We might not overwrite the identification[] completely and on
5560          * some platforms time_entered will contain some padding. Therefore
5561          * zero out the cookie to avoid putting uninitialized memory on the
5562          * wire.
5563          */
5564         memset(&stc, 0, sizeof(struct sctp_state_cookie));
5565
5566         /* the time I built cookie */
5567         (void)SCTP_GETTIME_TIMEVAL(&now);
5568         stc.time_entered.tv_sec = now.tv_sec;
5569         stc.time_entered.tv_usec = now.tv_usec;
5570
5571         /* populate any tie tags */
5572         if (asoc != NULL) {
5573                 /* unlock before tag selections */
5574                 stc.tie_tag_my_vtag = asoc->my_vtag_nonce;
5575                 stc.tie_tag_peer_vtag = asoc->peer_vtag_nonce;
5576                 stc.cookie_life = asoc->cookie_life;
5577                 net = asoc->primary_destination;
5578         } else {
5579                 stc.tie_tag_my_vtag = 0;
5580                 stc.tie_tag_peer_vtag = 0;
5581                 /* life I will award this cookie */
5582                 stc.cookie_life = inp->sctp_ep.def_cookie_life;
5583         }
5584
5585         /* copy in the ports for later check */
5586         stc.myport = sh->dest_port;
5587         stc.peerport = sh->src_port;
5588
5589         /*
5590          * If we wanted to honor cookie life extensions, we would add to
5591          * stc.cookie_life. For now we should NOT honor any extension
5592          */
5593         stc.site_scope = stc.local_scope = stc.loopback_scope = 0;
5594         if (inp->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
5595                 stc.ipv6_addr_legal = 1;
5596                 if (SCTP_IPV6_V6ONLY(inp)) {
5597                         stc.ipv4_addr_legal = 0;
5598                 } else {
5599                         stc.ipv4_addr_legal = 1;
5600                 }
5601         } else {
5602                 stc.ipv6_addr_legal = 0;
5603                 stc.ipv4_addr_legal = 1;
5604         }
5605         stc.ipv4_scope = 0;
5606         if (net == NULL) {
5607                 to = src;
5608                 switch (dst->sa_family) {
5609 #ifdef INET
5610                 case AF_INET:
5611                         {
5612                                 /* lookup address */
5613                                 stc.address[0] = src4->sin_addr.s_addr;
5614                                 stc.address[1] = 0;
5615                                 stc.address[2] = 0;
5616                                 stc.address[3] = 0;
5617                                 stc.addr_type = SCTP_IPV4_ADDRESS;
5618                                 /* local from address */
5619                                 stc.laddress[0] = dst4->sin_addr.s_addr;
5620                                 stc.laddress[1] = 0;
5621                                 stc.laddress[2] = 0;
5622                                 stc.laddress[3] = 0;
5623                                 stc.laddr_type = SCTP_IPV4_ADDRESS;
5624                                 /* scope_id is only for v6 */
5625                                 stc.scope_id = 0;
5626                                 if ((IN4_ISPRIVATE_ADDRESS(&src4->sin_addr)) ||
5627                                     (IN4_ISPRIVATE_ADDRESS(&dst4->sin_addr))) {
5628                                         stc.ipv4_scope = 1;
5629                                 }
5630                                 /* Must use the address in this case */
5631                                 if (sctp_is_address_on_local_host(src, vrf_id)) {
5632                                         stc.loopback_scope = 1;
5633                                         stc.ipv4_scope = 1;
5634                                         stc.site_scope = 1;
5635                                         stc.local_scope = 0;
5636                                 }
5637                                 break;
5638                         }
5639 #endif
5640 #ifdef INET6
5641                 case AF_INET6:
5642                         {
5643                                 stc.addr_type = SCTP_IPV6_ADDRESS;
5644                                 memcpy(&stc.address, &src6->sin6_addr, sizeof(struct in6_addr));
5645                                 stc.scope_id = ntohs(in6_getscope(&src6->sin6_addr));
5646                                 if (sctp_is_address_on_local_host(src, vrf_id)) {
5647                                         stc.loopback_scope = 1;
5648                                         stc.local_scope = 0;
5649                                         stc.site_scope = 1;
5650                                         stc.ipv4_scope = 1;
5651                                 } else if (IN6_IS_ADDR_LINKLOCAL(&src6->sin6_addr) ||
5652                                     IN6_IS_ADDR_LINKLOCAL(&dst6->sin6_addr)) {
5653                                         /*
5654                                          * If the new destination or source
5655                                          * is a LINK_LOCAL we must have
5656                                          * common both site and local scope.
5657                                          * Don't set local scope though
5658                                          * since we must depend on the
5659                                          * source to be added implicitly. We
5660                                          * cannot assure just because we
5661                                          * share one link that all links are
5662                                          * common.
5663                                          */
5664                                         stc.local_scope = 0;
5665                                         stc.site_scope = 1;
5666                                         stc.ipv4_scope = 1;
5667                                         /*
5668                                          * we start counting for the private
5669                                          * address stuff at 1. since the
5670                                          * link local we source from won't
5671                                          * show up in our scoped count.
5672                                          */
5673                                         cnt_inits_to = 1;
5674                                         /*
5675                                          * pull out the scope_id from
5676                                          * incoming pkt
5677                                          */
5678                                 } else if (IN6_IS_ADDR_SITELOCAL(&src6->sin6_addr) ||
5679                                     IN6_IS_ADDR_SITELOCAL(&dst6->sin6_addr)) {
5680                                         /*
5681                                          * If the new destination or source
5682                                          * is SITE_LOCAL then we must have
5683                                          * site scope in common.
5684                                          */
5685                                         stc.site_scope = 1;
5686                                 }
5687                                 memcpy(&stc.laddress, &dst6->sin6_addr, sizeof(struct in6_addr));
5688                                 stc.laddr_type = SCTP_IPV6_ADDRESS;
5689                                 break;
5690                         }
5691 #endif
5692                 default:
5693                         /* TSNH */
5694                         goto do_a_abort;
5695                         break;
5696                 }
5697         } else {
5698                 /* set the scope per the existing tcb */
5699
5700 #ifdef INET6
5701                 struct sctp_nets *lnet;
5702 #endif
5703
5704                 stc.loopback_scope = asoc->scope.loopback_scope;
5705                 stc.ipv4_scope = asoc->scope.ipv4_local_scope;
5706                 stc.site_scope = asoc->scope.site_scope;
5707                 stc.local_scope = asoc->scope.local_scope;
5708 #ifdef INET6
5709                 /* Why do we not consider IPv4 LL addresses? */
5710                 TAILQ_FOREACH(lnet, &asoc->nets, sctp_next) {
5711                         if (lnet->ro._l_addr.sin6.sin6_family == AF_INET6) {
5712                                 if (IN6_IS_ADDR_LINKLOCAL(&lnet->ro._l_addr.sin6.sin6_addr)) {
5713                                         /*
5714                                          * if we have a LL address, start
5715                                          * counting at 1.
5716                                          */
5717                                         cnt_inits_to = 1;
5718                                 }
5719                         }
5720                 }
5721 #endif
5722                 /* use the net pointer */
5723                 to = (struct sockaddr *)&net->ro._l_addr;
5724                 switch (to->sa_family) {
5725 #ifdef INET
5726                 case AF_INET:
5727                         sin = (struct sockaddr_in *)to;
5728                         stc.address[0] = sin->sin_addr.s_addr;
5729                         stc.address[1] = 0;
5730                         stc.address[2] = 0;
5731                         stc.address[3] = 0;
5732                         stc.addr_type = SCTP_IPV4_ADDRESS;
5733                         if (net->src_addr_selected == 0) {
5734                                 /*
5735                                  * strange case here, the INIT should have
5736                                  * did the selection.
5737                                  */
5738                                 net->ro._s_addr = sctp_source_address_selection(inp,
5739                                     stcb, (sctp_route_t *)&net->ro,
5740                                     net, 0, vrf_id);
5741                                 if (net->ro._s_addr == NULL) {
5742                                         sctp_m_freem(op_err);
5743                                         sctp_m_freem(m);
5744                                         return;
5745                                 }
5746
5747                                 net->src_addr_selected = 1;
5748
5749                         }
5750                         stc.laddress[0] = net->ro._s_addr->address.sin.sin_addr.s_addr;
5751                         stc.laddress[1] = 0;
5752                         stc.laddress[2] = 0;
5753                         stc.laddress[3] = 0;
5754                         stc.laddr_type = SCTP_IPV4_ADDRESS;
5755                         /* scope_id is only for v6 */
5756                         stc.scope_id = 0;
5757                         break;
5758 #endif
5759 #ifdef INET6
5760                 case AF_INET6:
5761                         sin6 = (struct sockaddr_in6 *)to;
5762                         memcpy(&stc.address, &sin6->sin6_addr,
5763                             sizeof(struct in6_addr));
5764                         stc.addr_type = SCTP_IPV6_ADDRESS;
5765                         stc.scope_id = sin6->sin6_scope_id;
5766                         if (net->src_addr_selected == 0) {
5767                                 /*
5768                                  * strange case here, the INIT should have
5769                                  * done the selection.
5770                                  */
5771                                 net->ro._s_addr = sctp_source_address_selection(inp,
5772                                     stcb, (sctp_route_t *)&net->ro,
5773                                     net, 0, vrf_id);
5774                                 if (net->ro._s_addr == NULL) {
5775                                         sctp_m_freem(op_err);
5776                                         sctp_m_freem(m);
5777                                         return;
5778                                 }
5779
5780                                 net->src_addr_selected = 1;
5781                         }
5782                         memcpy(&stc.laddress, &net->ro._s_addr->address.sin6.sin6_addr,
5783                             sizeof(struct in6_addr));
5784                         stc.laddr_type = SCTP_IPV6_ADDRESS;
5785                         break;
5786 #endif
5787                 }
5788         }
5789         /* Now lets put the SCTP header in place */
5790         initack = mtod(m, struct sctp_init_ack_chunk *);
5791         /* Save it off for quick ref */
5792         stc.peers_vtag = ntohl(init_chk->init.initiate_tag);
5793         /* who are we */
5794         memcpy(stc.identification, SCTP_VERSION_STRING,
5795             min(strlen(SCTP_VERSION_STRING), sizeof(stc.identification)));
5796         memset(stc.reserved, 0, SCTP_RESERVE_SPACE);
5797         /* now the chunk header */
5798         initack->ch.chunk_type = SCTP_INITIATION_ACK;
5799         initack->ch.chunk_flags = 0;
5800         /* fill in later from mbuf we build */
5801         initack->ch.chunk_length = 0;
5802         /* place in my tag */
5803         if ((asoc != NULL) &&
5804             ((SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_WAIT) ||
5805             (SCTP_GET_STATE(stcb) == SCTP_STATE_INUSE) ||
5806             (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED))) {
5807                 /* re-use the v-tags and init-seq here */
5808                 initack->init.initiate_tag = htonl(asoc->my_vtag);
5809                 initack->init.initial_tsn = htonl(asoc->init_seq_number);
5810         } else {
5811                 uint32_t vtag, itsn;
5812
5813                 if (asoc) {
5814                         atomic_add_int(&asoc->refcnt, 1);
5815                         SCTP_TCB_UNLOCK(stcb);
5816         new_tag:
5817                         vtag = sctp_select_a_tag(inp, inp->sctp_lport, sh->src_port, 1);
5818                         if ((asoc->peer_supports_nat) && (vtag == asoc->my_vtag)) {
5819                                 /*
5820                                  * Got a duplicate vtag on some guy behind a
5821                                  * nat make sure we don't use it.
5822                                  */
5823                                 goto new_tag;
5824                         }
5825                         initack->init.initiate_tag = htonl(vtag);
5826                         /* get a TSN to use too */
5827                         itsn = sctp_select_initial_TSN(&inp->sctp_ep);
5828                         initack->init.initial_tsn = htonl(itsn);
5829                         SCTP_TCB_LOCK(stcb);
5830                         atomic_add_int(&asoc->refcnt, -1);
5831                 } else {
5832                         SCTP_INP_INCR_REF(inp);
5833                         SCTP_INP_RUNLOCK(inp);
5834                         vtag = sctp_select_a_tag(inp, inp->sctp_lport, sh->src_port, 1);
5835                         initack->init.initiate_tag = htonl(vtag);
5836                         /* get a TSN to use too */
5837                         initack->init.initial_tsn = htonl(sctp_select_initial_TSN(&inp->sctp_ep));
5838                         SCTP_INP_RLOCK(inp);
5839                         SCTP_INP_DECR_REF(inp);
5840                 }
5841         }
5842         /* save away my tag to */
5843         stc.my_vtag = initack->init.initiate_tag;
5844
5845         /* set up some of the credits. */
5846         so = inp->sctp_socket;
5847         if (so == NULL) {
5848                 /* memory problem */
5849                 sctp_m_freem(op_err);
5850                 sctp_m_freem(m);
5851                 return;
5852         } else {
5853                 initack->init.a_rwnd = htonl(max(SCTP_SB_LIMIT_RCV(so), SCTP_MINIMAL_RWND));
5854         }
5855         /* set what I want */
5856         his_limit = ntohs(init_chk->init.num_inbound_streams);
5857         /* choose what I want */
5858         if (asoc != NULL) {
5859                 if (asoc->streamoutcnt > asoc->pre_open_streams) {
5860                         i_want = asoc->streamoutcnt;
5861                 } else {
5862                         i_want = asoc->pre_open_streams;
5863                 }
5864         } else {
5865                 i_want = inp->sctp_ep.pre_open_stream_count;
5866         }
5867         if (his_limit < i_want) {
5868                 /* I Want more :< */
5869                 initack->init.num_outbound_streams = init_chk->init.num_inbound_streams;
5870         } else {
5871                 /* I can have what I want :> */
5872                 initack->init.num_outbound_streams = htons(i_want);
5873         }
5874         /* tell him his limit. */
5875         initack->init.num_inbound_streams =
5876             htons(inp->sctp_ep.max_open_streams_intome);
5877
5878         /* adaptation layer indication parameter */
5879         if (inp->sctp_ep.adaptation_layer_indicator_provided) {
5880                 parameter_len = (uint16_t)sizeof(struct sctp_adaptation_layer_indication);
5881                 ali = (struct sctp_adaptation_layer_indication *)(mtod(m, caddr_t)+chunk_len);
5882                 ali->ph.param_type = htons(SCTP_ULP_ADAPTATION);
5883                 ali->ph.param_length = htons(parameter_len);
5884                 ali->indication = htonl(inp->sctp_ep.adaptation_layer_indicator);
5885                 chunk_len += parameter_len;
5886         }
5887
5888         /* ECN parameter */
5889         if (((asoc != NULL) && (asoc->ecn_supported == 1)) ||
5890             ((asoc == NULL) && (inp->ecn_supported == 1))) {
5891                 parameter_len = (uint16_t)sizeof(struct sctp_paramhdr);
5892                 ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
5893                 ph->param_type = htons(SCTP_ECN_CAPABLE);
5894                 ph->param_length = htons(parameter_len);
5895                 chunk_len += parameter_len;
5896         }
5897
5898         /* PR-SCTP supported parameter */
5899         if (((asoc != NULL) && (asoc->prsctp_supported == 1)) ||
5900             ((asoc == NULL) && (inp->prsctp_supported == 1))) {
5901                 parameter_len = (uint16_t)sizeof(struct sctp_paramhdr);
5902                 ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
5903                 ph->param_type = htons(SCTP_PRSCTP_SUPPORTED);
5904                 ph->param_length = htons(parameter_len);
5905                 chunk_len += parameter_len;
5906         }
5907
5908         /* Add NAT friendly parameter */
5909         if (nat_friendly) {
5910                 parameter_len = (uint16_t)sizeof(struct sctp_paramhdr);
5911                 ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
5912                 ph->param_type = htons(SCTP_HAS_NAT_SUPPORT);
5913                 ph->param_length = htons(parameter_len);
5914                 chunk_len += parameter_len;
5915         }
5916
5917         /* And now tell the peer which extensions we support */
5918         num_ext = 0;
5919         pr_supported = (struct sctp_supported_chunk_types_param *)(mtod(m, caddr_t)+chunk_len);
5920         if (((asoc != NULL) && (asoc->prsctp_supported == 1)) ||
5921             ((asoc == NULL) && (inp->prsctp_supported == 1))) {
5922                 pr_supported->chunk_types[num_ext++] = SCTP_FORWARD_CUM_TSN;
5923                 if (((asoc != NULL) && (asoc->idata_supported == 1)) ||
5924                     ((asoc == NULL) && (inp->idata_supported == 1))) {
5925                         pr_supported->chunk_types[num_ext++] = SCTP_IFORWARD_CUM_TSN;
5926                 }
5927         }
5928         if (((asoc != NULL) && (asoc->auth_supported == 1)) ||
5929             ((asoc == NULL) && (inp->auth_supported == 1))) {
5930                 pr_supported->chunk_types[num_ext++] = SCTP_AUTHENTICATION;
5931         }
5932         if (((asoc != NULL) && (asoc->asconf_supported == 1)) ||
5933             ((asoc == NULL) && (inp->asconf_supported == 1))) {
5934                 pr_supported->chunk_types[num_ext++] = SCTP_ASCONF;
5935                 pr_supported->chunk_types[num_ext++] = SCTP_ASCONF_ACK;
5936         }
5937         if (((asoc != NULL) && (asoc->reconfig_supported == 1)) ||
5938             ((asoc == NULL) && (inp->reconfig_supported == 1))) {
5939                 pr_supported->chunk_types[num_ext++] = SCTP_STREAM_RESET;
5940         }
5941         if (((asoc != NULL) && (asoc->idata_supported == 1)) ||
5942             ((asoc == NULL) && (inp->idata_supported == 1))) {
5943                 pr_supported->chunk_types[num_ext++] = SCTP_IDATA;
5944         }
5945         if (((asoc != NULL) && (asoc->nrsack_supported == 1)) ||
5946             ((asoc == NULL) && (inp->nrsack_supported == 1))) {
5947                 pr_supported->chunk_types[num_ext++] = SCTP_NR_SELECTIVE_ACK;
5948         }
5949         if (((asoc != NULL) && (asoc->pktdrop_supported == 1)) ||
5950             ((asoc == NULL) && (inp->pktdrop_supported == 1))) {
5951                 pr_supported->chunk_types[num_ext++] = SCTP_PACKET_DROPPED;
5952         }
5953         if (num_ext > 0) {
5954                 parameter_len = (uint16_t)sizeof(struct sctp_supported_chunk_types_param) + num_ext;
5955                 pr_supported->ph.param_type = htons(SCTP_SUPPORTED_CHUNK_EXT);
5956                 pr_supported->ph.param_length = htons(parameter_len);
5957                 padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
5958                 chunk_len += parameter_len;
5959         }
5960
5961         /* add authentication parameters */
5962         if (((asoc != NULL) && (asoc->auth_supported == 1)) ||
5963             ((asoc == NULL) && (inp->auth_supported == 1))) {
5964                 struct sctp_auth_random *randp;
5965                 struct sctp_auth_hmac_algo *hmacs;
5966                 struct sctp_auth_chunk_list *chunks;
5967
5968                 if (padding_len > 0) {
5969                         memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
5970                         chunk_len += padding_len;
5971                         padding_len = 0;
5972                 }
5973                 /* generate and add RANDOM parameter */
5974                 randp = (struct sctp_auth_random *)(mtod(m, caddr_t)+chunk_len);
5975                 parameter_len = (uint16_t)sizeof(struct sctp_auth_random) +
5976                     SCTP_AUTH_RANDOM_SIZE_DEFAULT;
5977                 randp->ph.param_type = htons(SCTP_RANDOM);
5978                 randp->ph.param_length = htons(parameter_len);
5979                 SCTP_READ_RANDOM(randp->random_data, SCTP_AUTH_RANDOM_SIZE_DEFAULT);
5980                 padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
5981                 chunk_len += parameter_len;
5982
5983                 if (padding_len > 0) {
5984                         memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
5985                         chunk_len += padding_len;
5986                         padding_len = 0;
5987                 }
5988                 /* add HMAC_ALGO parameter */
5989                 hmacs = (struct sctp_auth_hmac_algo *)(mtod(m, caddr_t)+chunk_len);
5990                 parameter_len = (uint16_t)sizeof(struct sctp_auth_hmac_algo) +
5991                     sctp_serialize_hmaclist(inp->sctp_ep.local_hmacs,
5992                     (uint8_t *)hmacs->hmac_ids);
5993                 hmacs->ph.param_type = htons(SCTP_HMAC_LIST);
5994                 hmacs->ph.param_length = htons(parameter_len);
5995                 padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
5996                 chunk_len += parameter_len;
5997
5998                 if (padding_len > 0) {
5999                         memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
6000                         chunk_len += padding_len;
6001                         padding_len = 0;
6002                 }
6003                 /* add CHUNKS parameter */
6004                 chunks = (struct sctp_auth_chunk_list *)(mtod(m, caddr_t)+chunk_len);
6005                 parameter_len = (uint16_t)sizeof(struct sctp_auth_chunk_list) +
6006                     sctp_serialize_auth_chunks(inp->sctp_ep.local_auth_chunks,
6007                     chunks->chunk_types);
6008                 chunks->ph.param_type = htons(SCTP_CHUNK_LIST);
6009                 chunks->ph.param_length = htons(parameter_len);
6010                 padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
6011                 chunk_len += parameter_len;
6012         }
6013         SCTP_BUF_LEN(m) = chunk_len;
6014         m_last = m;
6015         /* now the addresses */
6016         /*
6017          * To optimize this we could put the scoping stuff into a structure
6018          * and remove the individual uint8's from the stc structure. Then we
6019          * could just sifa in the address within the stc.. but for now this
6020          * is a quick hack to get the address stuff teased apart.
6021          */
6022         scp.ipv4_addr_legal = stc.ipv4_addr_legal;
6023         scp.ipv6_addr_legal = stc.ipv6_addr_legal;
6024         scp.loopback_scope = stc.loopback_scope;
6025         scp.ipv4_local_scope = stc.ipv4_scope;
6026         scp.local_scope = stc.local_scope;
6027         scp.site_scope = stc.site_scope;
6028         m_last = sctp_add_addresses_to_i_ia(inp, stcb, &scp, m_last,
6029             cnt_inits_to,
6030             &padding_len, &chunk_len);
6031         /* padding_len can only be positive, if no addresses have been added */
6032         if (padding_len > 0) {
6033                 memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
6034                 chunk_len += padding_len;
6035                 SCTP_BUF_LEN(m) += padding_len;
6036                 padding_len = 0;
6037         }
6038
6039         /* tack on the operational error if present */
6040         if (op_err) {
6041                 parameter_len = 0;
6042                 for (m_tmp = op_err; m_tmp != NULL; m_tmp = SCTP_BUF_NEXT(m_tmp)) {
6043                         parameter_len += SCTP_BUF_LEN(m_tmp);
6044                 }
6045                 padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
6046                 SCTP_BUF_NEXT(m_last) = op_err;
6047                 while (SCTP_BUF_NEXT(m_last) != NULL) {
6048                         m_last = SCTP_BUF_NEXT(m_last);
6049                 }
6050                 chunk_len += parameter_len;
6051         }
6052         if (padding_len > 0) {
6053                 m_last = sctp_add_pad_tombuf(m_last, padding_len);
6054                 if (m_last == NULL) {
6055                         /* Houston we have a problem, no space */
6056                         sctp_m_freem(m);
6057                         return;
6058                 }
6059                 chunk_len += padding_len;
6060                 padding_len = 0;
6061         }
6062         /* Now we must build a cookie */
6063         m_cookie = sctp_add_cookie(init_pkt, offset, m, 0, &stc, &signature);
6064         if (m_cookie == NULL) {
6065                 /* memory problem */
6066                 sctp_m_freem(m);
6067                 return;
6068         }
6069         /* Now append the cookie to the end and update the space/size */
6070         SCTP_BUF_NEXT(m_last) = m_cookie;
6071         parameter_len = 0;
6072         for (m_tmp = m_cookie; m_tmp != NULL; m_tmp = SCTP_BUF_NEXT(m_tmp)) {
6073                 parameter_len += SCTP_BUF_LEN(m_tmp);
6074                 if (SCTP_BUF_NEXT(m_tmp) == NULL) {
6075                         m_last = m_tmp;
6076                 }
6077         }
6078         padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
6079         chunk_len += parameter_len;
6080
6081         /*
6082          * Place in the size, but we don't include the last pad (if any) in
6083          * the INIT-ACK.
6084          */
6085         initack->ch.chunk_length = htons(chunk_len);
6086
6087         /*
6088          * Time to sign the cookie, we don't sign over the cookie signature
6089          * though thus we set trailer.
6090          */
6091         (void)sctp_hmac_m(SCTP_HMAC,
6092             (uint8_t *)inp->sctp_ep.secret_key[(int)(inp->sctp_ep.current_secret_number)],
6093             SCTP_SECRET_SIZE, m_cookie, sizeof(struct sctp_paramhdr),
6094             (uint8_t *)signature, SCTP_SIGNATURE_SIZE);
6095         /*
6096          * We sifa 0 here to NOT set IP_DF if its IPv4, we ignore the return
6097          * here since the timer will drive a retranmission.
6098          */
6099         if (padding_len > 0) {
6100                 if (sctp_add_pad_tombuf(m_last, padding_len) == NULL) {
6101                         sctp_m_freem(m);
6102                         return;
6103                 }
6104         }
6105         if (stc.loopback_scope) {
6106                 over_addr = (union sctp_sockstore *)dst;
6107         } else {
6108                 over_addr = NULL;
6109         }
6110
6111         if ((error = sctp_lowlevel_chunk_output(inp, NULL, NULL, to, m, 0, NULL, 0, 0,
6112             0, 0,
6113             inp->sctp_lport, sh->src_port, init_chk->init.initiate_tag,
6114             port, over_addr,
6115             mflowtype, mflowid,
6116             SCTP_SO_NOT_LOCKED))) {
6117                 SCTPDBG(SCTP_DEBUG_OUTPUT4, "Gak send error %d\n", error);
6118                 if (error == ENOBUFS) {
6119                         if (asoc != NULL) {
6120                                 asoc->ifp_had_enobuf = 1;
6121                         }
6122                         SCTP_STAT_INCR(sctps_lowlevelerr);
6123                 }
6124         } else {
6125                 if (asoc != NULL) {
6126                         asoc->ifp_had_enobuf = 0;
6127                 }
6128         }
6129         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
6130 }
6131
6132
6133 static void
6134 sctp_prune_prsctp(struct sctp_tcb *stcb,
6135     struct sctp_association *asoc,
6136     struct sctp_sndrcvinfo *srcv,
6137     int dataout)
6138 {
6139         int freed_spc = 0;
6140         struct sctp_tmit_chunk *chk, *nchk;
6141
6142         SCTP_TCB_LOCK_ASSERT(stcb);
6143         if ((asoc->prsctp_supported) &&
6144             (asoc->sent_queue_cnt_removeable > 0)) {
6145                 TAILQ_FOREACH(chk, &asoc->sent_queue, sctp_next) {
6146                         /*
6147                          * Look for chunks marked with the PR_SCTP flag AND
6148                          * the buffer space flag. If the one being sent is
6149                          * equal or greater priority then purge the old one
6150                          * and free some space.
6151                          */
6152                         if (PR_SCTP_BUF_ENABLED(chk->flags)) {
6153                                 /*
6154                                  * This one is PR-SCTP AND buffer space
6155                                  * limited type
6156                                  */
6157                                 if (chk->rec.data.timetodrop.tv_sec > (long)srcv->sinfo_timetolive) {
6158                                         /*
6159                                          * Lower numbers equates to higher
6160                                          * priority so if the one we are
6161                                          * looking at has a larger
6162                                          * priority we want to drop the data
6163                                          * and NOT retransmit it.
6164                                          */
6165                                         if (chk->data) {
6166                                                 /*
6167                                                  * We release the book_size
6168                                                  * if the mbuf is here
6169                                                  */
6170                                                 int ret_spc;
6171                                                 uint8_t sent;
6172
6173                                                 if (chk->sent > SCTP_DATAGRAM_UNSENT)
6174                                                         sent = 1;
6175                                                 else
6176                                                         sent = 0;
6177                                                 ret_spc = sctp_release_pr_sctp_chunk(stcb, chk,
6178                                                     sent,
6179                                                     SCTP_SO_LOCKED);
6180                                                 freed_spc += ret_spc;
6181                                                 if (freed_spc >= dataout) {
6182                                                         return;
6183                                                 }
6184                                         }       /* if chunk was present */
6185                                 }       /* if of sufficient priority */
6186                         }       /* if chunk has enabled */
6187                 }               /* tailqforeach */
6188
6189                 TAILQ_FOREACH_SAFE(chk, &asoc->send_queue, sctp_next, nchk) {
6190                         /* Here we must move to the sent queue and mark */
6191                         if (PR_SCTP_BUF_ENABLED(chk->flags)) {
6192                                 if (chk->rec.data.timetodrop.tv_sec > (long)srcv->sinfo_timetolive) {
6193                                         if (chk->data) {
6194                                                 /*
6195                                                  * We release the book_size
6196                                                  * if the mbuf is here
6197                                                  */
6198                                                 int ret_spc;
6199
6200                                                 ret_spc = sctp_release_pr_sctp_chunk(stcb, chk,
6201                                                     0, SCTP_SO_LOCKED);
6202
6203                                                 freed_spc += ret_spc;
6204                                                 if (freed_spc >= dataout) {
6205                                                         return;
6206                                                 }
6207                                         }       /* end if chk->data */
6208                                 }       /* end if right class */
6209                         }       /* end if chk pr-sctp */
6210                 }               /* tailqforeachsafe (chk) */
6211         }                       /* if enabled in asoc */
6212 }
6213
6214 int
6215 sctp_get_frag_point(struct sctp_tcb *stcb,
6216     struct sctp_association *asoc)
6217 {
6218         int siz, ovh;
6219
6220         /*
6221          * For endpoints that have both v6 and v4 addresses we must reserve
6222          * room for the ipv6 header, for those that are only dealing with V4
6223          * we use a larger frag point.
6224          */
6225         if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
6226                 ovh = SCTP_MIN_OVERHEAD;
6227         } else {
6228                 ovh = SCTP_MIN_V4_OVERHEAD;
6229         }
6230         ovh += SCTP_DATA_CHUNK_OVERHEAD(stcb);
6231         if (stcb->asoc.sctp_frag_point > asoc->smallest_mtu)
6232                 siz = asoc->smallest_mtu - ovh;
6233         else
6234                 siz = (stcb->asoc.sctp_frag_point - ovh);
6235         /*
6236          * if (siz > (MCLBYTES-sizeof(struct sctp_data_chunk))) {
6237          */
6238         /* A data chunk MUST fit in a cluster */
6239         /* siz = (MCLBYTES - sizeof(struct sctp_data_chunk)); */
6240         /* } */
6241
6242         /* adjust for an AUTH chunk if DATA requires auth */
6243         if (sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks))
6244                 siz -= sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
6245
6246         if (siz % 4) {
6247                 /* make it an even word boundary please */
6248                 siz -= (siz % 4);
6249         }
6250         return (siz);
6251 }
6252
6253 static void
6254 sctp_set_prsctp_policy(struct sctp_stream_queue_pending *sp)
6255 {
6256         /*
6257          * We assume that the user wants PR_SCTP_TTL if the user provides a
6258          * positive lifetime but does not specify any PR_SCTP policy.
6259          */
6260         if (PR_SCTP_ENABLED(sp->sinfo_flags)) {
6261                 sp->act_flags |= PR_SCTP_POLICY(sp->sinfo_flags);
6262         } else if (sp->timetolive > 0) {
6263                 sp->sinfo_flags |= SCTP_PR_SCTP_TTL;
6264                 sp->act_flags |= PR_SCTP_POLICY(sp->sinfo_flags);
6265         } else {
6266                 return;
6267         }
6268         switch (PR_SCTP_POLICY(sp->sinfo_flags)) {
6269         case CHUNK_FLAGS_PR_SCTP_BUF:
6270                 /*
6271                  * Time to live is a priority stored in tv_sec when doing
6272                  * the buffer drop thing.
6273                  */
6274                 sp->ts.tv_sec = sp->timetolive;
6275                 sp->ts.tv_usec = 0;
6276                 break;
6277         case CHUNK_FLAGS_PR_SCTP_TTL:
6278                 {
6279                         struct timeval tv;
6280
6281                         (void)SCTP_GETTIME_TIMEVAL(&sp->ts);
6282                         tv.tv_sec = sp->timetolive / 1000;
6283                         tv.tv_usec = (sp->timetolive * 1000) % 1000000;
6284                         /*
6285                          * TODO sctp_constants.h needs alternative time
6286                          * macros when _KERNEL is undefined.
6287                          */
6288                         timevaladd(&sp->ts, &tv);
6289                 }
6290                 break;
6291         case CHUNK_FLAGS_PR_SCTP_RTX:
6292                 /*
6293                  * Time to live is a the number or retransmissions stored in
6294                  * tv_sec.
6295                  */
6296                 sp->ts.tv_sec = sp->timetolive;
6297                 sp->ts.tv_usec = 0;
6298                 break;
6299         default:
6300                 SCTPDBG(SCTP_DEBUG_USRREQ1,
6301                     "Unknown PR_SCTP policy %u.\n",
6302                     PR_SCTP_POLICY(sp->sinfo_flags));
6303                 break;
6304         }
6305 }
6306
6307 static int
6308 sctp_msg_append(struct sctp_tcb *stcb,
6309     struct sctp_nets *net,
6310     struct mbuf *m,
6311     struct sctp_sndrcvinfo *srcv, int hold_stcb_lock)
6312 {
6313         int error = 0;
6314         struct mbuf *at;
6315         struct sctp_stream_queue_pending *sp = NULL;
6316         struct sctp_stream_out *strm;
6317
6318         /*
6319          * Given an mbuf chain, put it into the association send queue and
6320          * place it on the wheel
6321          */
6322         if (srcv->sinfo_stream >= stcb->asoc.streamoutcnt) {
6323                 /* Invalid stream number */
6324                 SCTP_LTRACE_ERR_RET_PKT(m, NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
6325                 error = EINVAL;
6326                 goto out_now;
6327         }
6328         if ((stcb->asoc.stream_locked) &&
6329             (stcb->asoc.stream_locked_on != srcv->sinfo_stream)) {
6330                 SCTP_LTRACE_ERR_RET_PKT(m, NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
6331                 error = EINVAL;
6332                 goto out_now;
6333         }
6334         strm = &stcb->asoc.strmout[srcv->sinfo_stream];
6335         /* Now can we send this? */
6336         if ((SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_SENT) ||
6337             (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_ACK_SENT) ||
6338             (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_RECEIVED) ||
6339             (stcb->asoc.state & SCTP_STATE_SHUTDOWN_PENDING)) {
6340                 /* got data while shutting down */
6341                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
6342                 error = ECONNRESET;
6343                 goto out_now;
6344         }
6345         sctp_alloc_a_strmoq(stcb, sp);
6346         if (sp == NULL) {
6347                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
6348                 error = ENOMEM;
6349                 goto out_now;
6350         }
6351         sp->sinfo_flags = srcv->sinfo_flags;
6352         sp->timetolive = srcv->sinfo_timetolive;
6353         sp->ppid = srcv->sinfo_ppid;
6354         sp->context = srcv->sinfo_context;
6355         sp->fsn = 0;
6356         if (sp->sinfo_flags & SCTP_ADDR_OVER) {
6357                 sp->net = net;
6358                 atomic_add_int(&sp->net->ref_count, 1);
6359         } else {
6360                 sp->net = NULL;
6361         }
6362         (void)SCTP_GETTIME_TIMEVAL(&sp->ts);
6363         sp->sid = srcv->sinfo_stream;
6364         sp->msg_is_complete = 1;
6365         sp->sender_all_done = 1;
6366         sp->some_taken = 0;
6367         sp->data = m;
6368         sp->tail_mbuf = NULL;
6369         sctp_set_prsctp_policy(sp);
6370         /*
6371          * We could in theory (for sendall) sifa the length in, but we would
6372          * still have to hunt through the chain since we need to setup the
6373          * tail_mbuf
6374          */
6375         sp->length = 0;
6376         for (at = m; at; at = SCTP_BUF_NEXT(at)) {
6377                 if (SCTP_BUF_NEXT(at) == NULL)
6378                         sp->tail_mbuf = at;
6379                 sp->length += SCTP_BUF_LEN(at);
6380         }
6381         if (srcv->sinfo_keynumber_valid) {
6382                 sp->auth_keyid = srcv->sinfo_keynumber;
6383         } else {
6384                 sp->auth_keyid = stcb->asoc.authinfo.active_keyid;
6385         }
6386         if (sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks)) {
6387                 sctp_auth_key_acquire(stcb, sp->auth_keyid);
6388                 sp->holds_key_ref = 1;
6389         }
6390         if (hold_stcb_lock == 0) {
6391                 SCTP_TCB_SEND_LOCK(stcb);
6392         }
6393         sctp_snd_sb_alloc(stcb, sp->length);
6394         atomic_add_int(&stcb->asoc.stream_queue_cnt, 1);
6395         TAILQ_INSERT_TAIL(&strm->outqueue, sp, next);
6396         stcb->asoc.ss_functions.sctp_ss_add_to_stream(stcb, &stcb->asoc, strm, sp, 1);
6397         m = NULL;
6398         if (hold_stcb_lock == 0) {
6399                 SCTP_TCB_SEND_UNLOCK(stcb);
6400         }
6401 out_now:
6402         if (m) {
6403                 sctp_m_freem(m);
6404         }
6405         return (error);
6406 }
6407
6408
6409 static struct mbuf *
6410 sctp_copy_mbufchain(struct mbuf *clonechain,
6411     struct mbuf *outchain,
6412     struct mbuf **endofchain,
6413     int can_take_mbuf,
6414     int sizeofcpy,
6415     uint8_t copy_by_ref)
6416 {
6417         struct mbuf *m;
6418         struct mbuf *appendchain;
6419         caddr_t cp;
6420         int len;
6421
6422         if (endofchain == NULL) {
6423                 /* error */
6424 error_out:
6425                 if (outchain)
6426                         sctp_m_freem(outchain);
6427                 return (NULL);
6428         }
6429         if (can_take_mbuf) {
6430                 appendchain = clonechain;
6431         } else {
6432                 if (!copy_by_ref &&
6433                     (sizeofcpy <= (int)((((SCTP_BASE_SYSCTL(sctp_mbuf_threshold_count) - 1) * MLEN) + MHLEN)))) {
6434                         /* Its not in a cluster */
6435                         if (*endofchain == NULL) {
6436                                 /* lets get a mbuf cluster */
6437                                 if (outchain == NULL) {
6438                                         /* This is the general case */
6439                         new_mbuf:
6440                                         outchain = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_HEADER);
6441                                         if (outchain == NULL) {
6442                                                 goto error_out;
6443                                         }
6444                                         SCTP_BUF_LEN(outchain) = 0;
6445                                         *endofchain = outchain;
6446                                         /* get the prepend space */
6447                                         SCTP_BUF_RESV_UF(outchain, (SCTP_FIRST_MBUF_RESV + 4));
6448                                 } else {
6449                                         /*
6450                                          * We really should not get a NULL
6451                                          * in endofchain
6452                                          */
6453                                         /* find end */
6454                                         m = outchain;
6455                                         while (m) {
6456                                                 if (SCTP_BUF_NEXT(m) == NULL) {
6457                                                         *endofchain = m;
6458                                                         break;
6459                                                 }
6460                                                 m = SCTP_BUF_NEXT(m);
6461                                         }
6462                                         /* sanity */
6463                                         if (*endofchain == NULL) {
6464                                                 /*
6465                                                  * huh, TSNH XXX maybe we
6466                                                  * should panic
6467                                                  */
6468                                                 sctp_m_freem(outchain);
6469                                                 goto new_mbuf;
6470                                         }
6471                                 }
6472                                 /* get the new end of length */
6473                                 len = (int)M_TRAILINGSPACE(*endofchain);
6474                         } else {
6475                                 /* how much is left at the end? */
6476                                 len = (int)M_TRAILINGSPACE(*endofchain);
6477                         }
6478                         /* Find the end of the data, for appending */
6479                         cp = (mtod((*endofchain), caddr_t)+SCTP_BUF_LEN((*endofchain)));
6480
6481                         /* Now lets copy it out */
6482                         if (len >= sizeofcpy) {
6483                                 /* It all fits, copy it in */
6484                                 m_copydata(clonechain, 0, sizeofcpy, cp);
6485                                 SCTP_BUF_LEN((*endofchain)) += sizeofcpy;
6486                         } else {
6487                                 /* fill up the end of the chain */
6488                                 if (len > 0) {
6489                                         m_copydata(clonechain, 0, len, cp);
6490                                         SCTP_BUF_LEN((*endofchain)) += len;
6491                                         /* now we need another one */
6492                                         sizeofcpy -= len;
6493                                 }
6494                                 m = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_HEADER);
6495                                 if (m == NULL) {
6496                                         /* We failed */
6497                                         goto error_out;
6498                                 }
6499                                 SCTP_BUF_NEXT((*endofchain)) = m;
6500                                 *endofchain = m;
6501                                 cp = mtod((*endofchain), caddr_t);
6502                                 m_copydata(clonechain, len, sizeofcpy, cp);
6503                                 SCTP_BUF_LEN((*endofchain)) += sizeofcpy;
6504                         }
6505                         return (outchain);
6506                 } else {
6507                         /* copy the old fashion way */
6508                         appendchain = SCTP_M_COPYM(clonechain, 0, M_COPYALL, M_NOWAIT);
6509 #ifdef SCTP_MBUF_LOGGING
6510                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
6511                                 sctp_log_mbc(appendchain, SCTP_MBUF_ICOPY);
6512                         }
6513 #endif
6514                 }
6515         }
6516         if (appendchain == NULL) {
6517                 /* error */
6518                 if (outchain)
6519                         sctp_m_freem(outchain);
6520                 return (NULL);
6521         }
6522         if (outchain) {
6523                 /* tack on to the end */
6524                 if (*endofchain != NULL) {
6525                         SCTP_BUF_NEXT(((*endofchain))) = appendchain;
6526                 } else {
6527                         m = outchain;
6528                         while (m) {
6529                                 if (SCTP_BUF_NEXT(m) == NULL) {
6530                                         SCTP_BUF_NEXT(m) = appendchain;
6531                                         break;
6532                                 }
6533                                 m = SCTP_BUF_NEXT(m);
6534                         }
6535                 }
6536                 /*
6537                  * save off the end and update the end-chain position
6538                  */
6539                 m = appendchain;
6540                 while (m) {
6541                         if (SCTP_BUF_NEXT(m) == NULL) {
6542                                 *endofchain = m;
6543                                 break;
6544                         }
6545                         m = SCTP_BUF_NEXT(m);
6546                 }
6547                 return (outchain);
6548         } else {
6549                 /* save off the end and update the end-chain position */
6550                 m = appendchain;
6551                 while (m) {
6552                         if (SCTP_BUF_NEXT(m) == NULL) {
6553                                 *endofchain = m;
6554                                 break;
6555                         }
6556                         m = SCTP_BUF_NEXT(m);
6557                 }
6558                 return (appendchain);
6559         }
6560 }
6561
6562 static int
6563 sctp_med_chunk_output(struct sctp_inpcb *inp,
6564     struct sctp_tcb *stcb,
6565     struct sctp_association *asoc,
6566     int *num_out,
6567     int *reason_code,
6568     int control_only, int from_where,
6569     struct timeval *now, int *now_filled, int frag_point, int so_locked);
6570
6571 static void
6572 sctp_sendall_iterator(struct sctp_inpcb *inp, struct sctp_tcb *stcb, void *ptr,
6573     uint32_t val SCTP_UNUSED)
6574 {
6575         struct sctp_copy_all *ca;
6576         struct mbuf *m;
6577         int ret = 0;
6578         int added_control = 0;
6579         int un_sent, do_chunk_output = 1;
6580         struct sctp_association *asoc;
6581         struct sctp_nets *net;
6582
6583         ca = (struct sctp_copy_all *)ptr;
6584         if (ca->m == NULL) {
6585                 return;
6586         }
6587         if (ca->inp != inp) {
6588                 /* TSNH */
6589                 return;
6590         }
6591         if (ca->sndlen > 0) {
6592                 m = SCTP_M_COPYM(ca->m, 0, M_COPYALL, M_NOWAIT);
6593                 if (m == NULL) {
6594                         /* can't copy so we are done */
6595                         ca->cnt_failed++;
6596                         return;
6597                 }
6598 #ifdef SCTP_MBUF_LOGGING
6599                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
6600                         sctp_log_mbc(m, SCTP_MBUF_ICOPY);
6601                 }
6602 #endif
6603         } else {
6604                 m = NULL;
6605         }
6606         SCTP_TCB_LOCK_ASSERT(stcb);
6607         if (stcb->asoc.alternate) {
6608                 net = stcb->asoc.alternate;
6609         } else {
6610                 net = stcb->asoc.primary_destination;
6611         }
6612         if (ca->sndrcv.sinfo_flags & SCTP_ABORT) {
6613                 /* Abort this assoc with m as the user defined reason */
6614                 if (m != NULL) {
6615                         SCTP_BUF_PREPEND(m, sizeof(struct sctp_paramhdr), M_NOWAIT);
6616                 } else {
6617                         m = sctp_get_mbuf_for_msg(sizeof(struct sctp_paramhdr),
6618                             0, M_NOWAIT, 1, MT_DATA);
6619                         SCTP_BUF_LEN(m) = sizeof(struct sctp_paramhdr);
6620                 }
6621                 if (m != NULL) {
6622                         struct sctp_paramhdr *ph;
6623
6624                         ph = mtod(m, struct sctp_paramhdr *);
6625                         ph->param_type = htons(SCTP_CAUSE_USER_INITIATED_ABT);
6626                         ph->param_length = htons((uint16_t)(sizeof(struct sctp_paramhdr) + ca->sndlen));
6627                 }
6628                 /*
6629                  * We add one here to keep the assoc from dis-appearing on
6630                  * us.
6631                  */
6632                 atomic_add_int(&stcb->asoc.refcnt, 1);
6633                 sctp_abort_an_association(inp, stcb, m, SCTP_SO_NOT_LOCKED);
6634                 /*
6635                  * sctp_abort_an_association calls sctp_free_asoc() free
6636                  * association will NOT free it since we incremented the
6637                  * refcnt .. we do this to prevent it being freed and things
6638                  * getting tricky since we could end up (from free_asoc)
6639                  * calling inpcb_free which would get a recursive lock call
6640                  * to the iterator lock.. But as a consequence of that the
6641                  * stcb will return to us un-locked.. since free_asoc
6642                  * returns with either no TCB or the TCB unlocked, we must
6643                  * relock.. to unlock in the iterator timer :-0
6644                  */
6645                 SCTP_TCB_LOCK(stcb);
6646                 atomic_add_int(&stcb->asoc.refcnt, -1);
6647                 goto no_chunk_output;
6648         } else {
6649                 if (m) {
6650                         ret = sctp_msg_append(stcb, net, m,
6651                             &ca->sndrcv, 1);
6652                 }
6653                 asoc = &stcb->asoc;
6654                 if (ca->sndrcv.sinfo_flags & SCTP_EOF) {
6655                         /* shutdown this assoc */
6656                         if (TAILQ_EMPTY(&asoc->send_queue) &&
6657                             TAILQ_EMPTY(&asoc->sent_queue) &&
6658                             sctp_is_there_unsent_data(stcb, SCTP_SO_NOT_LOCKED) == 0) {
6659                                 if ((*asoc->ss_functions.sctp_ss_is_user_msgs_incomplete) (stcb, asoc)) {
6660                                         goto abort_anyway;
6661                                 }
6662                                 /*
6663                                  * there is nothing queued to send, so I'm
6664                                  * done...
6665                                  */
6666                                 if ((SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_SENT) &&
6667                                     (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
6668                                     (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
6669                                         /*
6670                                          * only send SHUTDOWN the first time
6671                                          * through
6672                                          */
6673                                         if (SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) {
6674                                                 SCTP_STAT_DECR_GAUGE32(sctps_currestab);
6675                                         }
6676                                         SCTP_SET_STATE(stcb, SCTP_STATE_SHUTDOWN_SENT);
6677                                         sctp_stop_timers_for_shutdown(stcb);
6678                                         sctp_send_shutdown(stcb, net);
6679                                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb,
6680                                             net);
6681                                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
6682                                             NULL);
6683                                         added_control = 1;
6684                                         do_chunk_output = 0;
6685                                 }
6686                         } else {
6687                                 /*
6688                                  * we still got (or just got) data to send,
6689                                  * so set SHUTDOWN_PENDING
6690                                  */
6691                                 /*
6692                                  * XXX sockets draft says that SCTP_EOF
6693                                  * should be sent with no data.  currently,
6694                                  * we will allow user data to be sent first
6695                                  * and move to SHUTDOWN-PENDING
6696                                  */
6697                                 if ((SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_SENT) &&
6698                                     (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
6699                                     (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
6700                                         if ((*asoc->ss_functions.sctp_ss_is_user_msgs_incomplete) (stcb, asoc)) {
6701                                                 SCTP_ADD_SUBSTATE(stcb, SCTP_STATE_PARTIAL_MSG_LEFT);
6702                                         }
6703                                         SCTP_ADD_SUBSTATE(stcb, SCTP_STATE_SHUTDOWN_PENDING);
6704                                         if (TAILQ_EMPTY(&asoc->send_queue) &&
6705                                             TAILQ_EMPTY(&asoc->sent_queue) &&
6706                                             (asoc->state & SCTP_STATE_PARTIAL_MSG_LEFT)) {
6707                                                 struct mbuf *op_err;
6708                                                 char msg[SCTP_DIAG_INFO_LEN];
6709
6710                                 abort_anyway:
6711                                                 SCTP_SNPRINTF(msg, sizeof(msg),
6712                                                     "%s:%d at %s", __FILE__, __LINE__, __func__);
6713                                                 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
6714                                                     msg);
6715                                                 atomic_add_int(&stcb->asoc.refcnt, 1);
6716                                                 sctp_abort_an_association(stcb->sctp_ep, stcb,
6717                                                     op_err, SCTP_SO_NOT_LOCKED);
6718                                                 atomic_add_int(&stcb->asoc.refcnt, -1);
6719                                                 goto no_chunk_output;
6720                                         }
6721                                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
6722                                             NULL);
6723                                 }
6724                         }
6725
6726                 }
6727         }
6728         un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
6729             (stcb->asoc.stream_queue_cnt * SCTP_DATA_CHUNK_OVERHEAD(stcb)));
6730
6731         if ((sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY)) &&
6732             (stcb->asoc.total_flight > 0) &&
6733             (un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD))) {
6734                 do_chunk_output = 0;
6735         }
6736         if (do_chunk_output)
6737                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_NOT_LOCKED);
6738         else if (added_control) {
6739                 int num_out, reason, now_filled = 0;
6740                 struct timeval now;
6741                 int frag_point;
6742
6743                 frag_point = sctp_get_frag_point(stcb, &stcb->asoc);
6744                 (void)sctp_med_chunk_output(inp, stcb, &stcb->asoc, &num_out,
6745                     &reason, 1, 1, &now, &now_filled, frag_point, SCTP_SO_NOT_LOCKED);
6746         }
6747 no_chunk_output:
6748         if (ret) {
6749                 ca->cnt_failed++;
6750         } else {
6751                 ca->cnt_sent++;
6752         }
6753 }
6754
6755 static void
6756 sctp_sendall_completes(void *ptr, uint32_t val SCTP_UNUSED)
6757 {
6758         struct sctp_copy_all *ca;
6759
6760         ca = (struct sctp_copy_all *)ptr;
6761         /*
6762          * Do a notify here? Kacheong suggests that the notify be done at
6763          * the send time.. so you would push up a notification if any send
6764          * failed. Don't know if this is feasible since the only failures we
6765          * have is "memory" related and if you cannot get an mbuf to send
6766          * the data you surely can't get an mbuf to send up to notify the
6767          * user you can't send the data :->
6768          */
6769
6770         /* now free everything */
6771         if (ca->inp) {
6772                 /* Lets clear the flag to allow others to run. */
6773                 ca->inp->sctp_flags &= ~SCTP_PCB_FLAGS_SND_ITERATOR_UP;
6774         }
6775         sctp_m_freem(ca->m);
6776         SCTP_FREE(ca, SCTP_M_COPYAL);
6777 }
6778
6779 static struct mbuf *
6780 sctp_copy_out_all(struct uio *uio, ssize_t len)
6781 {
6782         struct mbuf *ret, *at;
6783         ssize_t left, willcpy, cancpy, error;
6784
6785         ret = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_WAITOK, 1, MT_DATA);
6786         if (ret == NULL) {
6787                 /* TSNH */
6788                 return (NULL);
6789         }
6790         left = len;
6791         SCTP_BUF_LEN(ret) = 0;
6792         /* save space for the data chunk header */
6793         cancpy = (int)M_TRAILINGSPACE(ret);
6794         willcpy = min(cancpy, left);
6795         at = ret;
6796         while (left > 0) {
6797                 /* Align data to the end */
6798                 error = uiomove(mtod(at, caddr_t), (int)willcpy, uio);
6799                 if (error) {
6800         err_out_now:
6801                         sctp_m_freem(at);
6802                         return (NULL);
6803                 }
6804                 SCTP_BUF_LEN(at) = (int)willcpy;
6805                 SCTP_BUF_NEXT_PKT(at) = SCTP_BUF_NEXT(at) = 0;
6806                 left -= willcpy;
6807                 if (left > 0) {
6808                         SCTP_BUF_NEXT(at) = sctp_get_mbuf_for_msg((unsigned int)left, 0, M_WAITOK, 1, MT_DATA);
6809                         if (SCTP_BUF_NEXT(at) == NULL) {
6810                                 goto err_out_now;
6811                         }
6812                         at = SCTP_BUF_NEXT(at);
6813                         SCTP_BUF_LEN(at) = 0;
6814                         cancpy = (int)M_TRAILINGSPACE(at);
6815                         willcpy = min(cancpy, left);
6816                 }
6817         }
6818         return (ret);
6819 }
6820
6821 static int
6822 sctp_sendall(struct sctp_inpcb *inp, struct uio *uio, struct mbuf *m,
6823     struct sctp_sndrcvinfo *srcv)
6824 {
6825         int ret;
6826         struct sctp_copy_all *ca;
6827
6828         if (inp->sctp_flags & SCTP_PCB_FLAGS_SND_ITERATOR_UP) {
6829                 /* There is another. */
6830                 return (EBUSY);
6831         }
6832         if (uio->uio_resid > (ssize_t)SCTP_BASE_SYSCTL(sctp_sendall_limit)) {
6833                 /* You must not be larger than the limit! */
6834                 return (EMSGSIZE);
6835         }
6836         SCTP_MALLOC(ca, struct sctp_copy_all *, sizeof(struct sctp_copy_all),
6837             SCTP_M_COPYAL);
6838         if (ca == NULL) {
6839                 sctp_m_freem(m);
6840                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
6841                 return (ENOMEM);
6842         }
6843         memset(ca, 0, sizeof(struct sctp_copy_all));
6844
6845         ca->inp = inp;
6846         if (srcv) {
6847                 memcpy(&ca->sndrcv, srcv, sizeof(struct sctp_nonpad_sndrcvinfo));
6848         }
6849         /*
6850          * take off the sendall flag, it would be bad if we failed to do
6851          * this :-0
6852          */
6853         ca->sndrcv.sinfo_flags &= ~SCTP_SENDALL;
6854         /* get length and mbuf chain */
6855         if (uio) {
6856                 ca->sndlen = uio->uio_resid;
6857                 ca->m = sctp_copy_out_all(uio, ca->sndlen);
6858                 if (ca->m == NULL) {
6859                         SCTP_FREE(ca, SCTP_M_COPYAL);
6860                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
6861                         return (ENOMEM);
6862                 }
6863         } else {
6864                 /* Gather the length of the send */
6865                 struct mbuf *mat;
6866
6867                 ca->sndlen = 0;
6868                 for (mat = m; mat; mat = SCTP_BUF_NEXT(mat)) {
6869                         ca->sndlen += SCTP_BUF_LEN(mat);
6870                 }
6871         }
6872         inp->sctp_flags |= SCTP_PCB_FLAGS_SND_ITERATOR_UP;
6873         ret = sctp_initiate_iterator(NULL, sctp_sendall_iterator, NULL,
6874             SCTP_PCB_ANY_FLAGS, SCTP_PCB_ANY_FEATURES,
6875             SCTP_ASOC_ANY_STATE,
6876             (void *)ca, 0,
6877             sctp_sendall_completes, inp, 1);
6878         if (ret) {
6879                 inp->sctp_flags &= ~SCTP_PCB_FLAGS_SND_ITERATOR_UP;
6880                 SCTP_FREE(ca, SCTP_M_COPYAL);
6881                 SCTP_LTRACE_ERR_RET_PKT(m, inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EFAULT);
6882                 return (EFAULT);
6883         }
6884         return (0);
6885 }
6886
6887
6888 void
6889 sctp_toss_old_cookies(struct sctp_tcb *stcb, struct sctp_association *asoc)
6890 {
6891         struct sctp_tmit_chunk *chk, *nchk;
6892
6893         TAILQ_FOREACH_SAFE(chk, &asoc->control_send_queue, sctp_next, nchk) {
6894                 if (chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
6895                         TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
6896                         asoc->ctrl_queue_cnt--;
6897                         if (chk->data) {
6898                                 sctp_m_freem(chk->data);
6899                                 chk->data = NULL;
6900                         }
6901                         sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
6902                 }
6903         }
6904 }
6905
6906 void
6907 sctp_toss_old_asconf(struct sctp_tcb *stcb)
6908 {
6909         struct sctp_association *asoc;
6910         struct sctp_tmit_chunk *chk, *nchk;
6911         struct sctp_asconf_chunk *acp;
6912
6913         asoc = &stcb->asoc;
6914         TAILQ_FOREACH_SAFE(chk, &asoc->asconf_send_queue, sctp_next, nchk) {
6915                 /* find SCTP_ASCONF chunk in queue */
6916                 if (chk->rec.chunk_id.id == SCTP_ASCONF) {
6917                         if (chk->data) {
6918                                 acp = mtod(chk->data, struct sctp_asconf_chunk *);
6919                                 if (SCTP_TSN_GT(ntohl(acp->serial_number), asoc->asconf_seq_out_acked)) {
6920                                         /* Not Acked yet */
6921                                         break;
6922                                 }
6923                         }
6924                         TAILQ_REMOVE(&asoc->asconf_send_queue, chk, sctp_next);
6925                         asoc->ctrl_queue_cnt--;
6926                         if (chk->data) {
6927                                 sctp_m_freem(chk->data);
6928                                 chk->data = NULL;
6929                         }
6930                         sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
6931                 }
6932         }
6933 }
6934
6935
6936 static void
6937 sctp_clean_up_datalist(struct sctp_tcb *stcb,
6938     struct sctp_association *asoc,
6939     struct sctp_tmit_chunk **data_list,
6940     int bundle_at,
6941     struct sctp_nets *net)
6942 {
6943         int i;
6944         struct sctp_tmit_chunk *tp1;
6945
6946         for (i = 0; i < bundle_at; i++) {
6947                 /* off of the send queue */
6948                 TAILQ_REMOVE(&asoc->send_queue, data_list[i], sctp_next);
6949                 asoc->send_queue_cnt--;
6950                 if (i > 0) {
6951                         /*
6952                          * Any chunk NOT 0 you zap the time chunk 0 gets
6953                          * zapped or set based on if a RTO measurment is
6954                          * needed.
6955                          */
6956                         data_list[i]->do_rtt = 0;
6957                 }
6958                 /* record time */
6959                 data_list[i]->sent_rcv_time = net->last_sent_time;
6960                 data_list[i]->rec.data.cwnd_at_send = net->cwnd;
6961                 data_list[i]->rec.data.fast_retran_tsn = data_list[i]->rec.data.tsn;
6962                 if (data_list[i]->whoTo == NULL) {
6963                         data_list[i]->whoTo = net;
6964                         atomic_add_int(&net->ref_count, 1);
6965                 }
6966                 /* on to the sent queue */
6967                 tp1 = TAILQ_LAST(&asoc->sent_queue, sctpchunk_listhead);
6968                 if ((tp1) && SCTP_TSN_GT(tp1->rec.data.tsn, data_list[i]->rec.data.tsn)) {
6969                         struct sctp_tmit_chunk *tpp;
6970
6971                         /* need to move back */
6972         back_up_more:
6973                         tpp = TAILQ_PREV(tp1, sctpchunk_listhead, sctp_next);
6974                         if (tpp == NULL) {
6975                                 TAILQ_INSERT_BEFORE(tp1, data_list[i], sctp_next);
6976                                 goto all_done;
6977                         }
6978                         tp1 = tpp;
6979                         if (SCTP_TSN_GT(tp1->rec.data.tsn, data_list[i]->rec.data.tsn)) {
6980                                 goto back_up_more;
6981                         }
6982                         TAILQ_INSERT_AFTER(&asoc->sent_queue, tp1, data_list[i], sctp_next);
6983                 } else {
6984                         TAILQ_INSERT_TAIL(&asoc->sent_queue,
6985                             data_list[i],
6986                             sctp_next);
6987                 }
6988 all_done:
6989                 /* This does not lower until the cum-ack passes it */
6990                 asoc->sent_queue_cnt++;
6991                 if ((asoc->peers_rwnd <= 0) &&
6992                     (asoc->total_flight == 0) &&
6993                     (bundle_at == 1)) {
6994                         /* Mark the chunk as being a window probe */
6995                         SCTP_STAT_INCR(sctps_windowprobed);
6996                 }
6997 #ifdef SCTP_AUDITING_ENABLED
6998                 sctp_audit_log(0xC2, 3);
6999 #endif
7000                 data_list[i]->sent = SCTP_DATAGRAM_SENT;
7001                 data_list[i]->snd_count = 1;
7002                 data_list[i]->rec.data.chunk_was_revoked = 0;
7003                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
7004                         sctp_misc_ints(SCTP_FLIGHT_LOG_UP,
7005                             data_list[i]->whoTo->flight_size,
7006                             data_list[i]->book_size,
7007                             (uint32_t)(uintptr_t)data_list[i]->whoTo,
7008                             data_list[i]->rec.data.tsn);
7009                 }
7010                 sctp_flight_size_increase(data_list[i]);
7011                 sctp_total_flight_increase(stcb, data_list[i]);
7012                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_RWND_ENABLE) {
7013                         sctp_log_rwnd(SCTP_DECREASE_PEER_RWND,
7014                             asoc->peers_rwnd, data_list[i]->send_size, SCTP_BASE_SYSCTL(sctp_peer_chunk_oh));
7015                 }
7016                 asoc->peers_rwnd = sctp_sbspace_sub(asoc->peers_rwnd,
7017                     (uint32_t)(data_list[i]->send_size + SCTP_BASE_SYSCTL(sctp_peer_chunk_oh)));
7018                 if (asoc->peers_rwnd < stcb->sctp_ep->sctp_ep.sctp_sws_sender) {
7019                         /* SWS sender side engages */
7020                         asoc->peers_rwnd = 0;
7021                 }
7022         }
7023         if (asoc->cc_functions.sctp_cwnd_update_packet_transmitted) {
7024                 (*asoc->cc_functions.sctp_cwnd_update_packet_transmitted) (stcb, net);
7025         }
7026 }
7027
7028 static void
7029 sctp_clean_up_ctl(struct sctp_tcb *stcb, struct sctp_association *asoc, int so_locked)
7030 {
7031         struct sctp_tmit_chunk *chk, *nchk;
7032
7033         TAILQ_FOREACH_SAFE(chk, &asoc->control_send_queue, sctp_next, nchk) {
7034                 if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
7035                     (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK) ||  /* EY */
7036                     (chk->rec.chunk_id.id == SCTP_HEARTBEAT_REQUEST) ||
7037                     (chk->rec.chunk_id.id == SCTP_HEARTBEAT_ACK) ||
7038                     (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN) ||
7039                     (chk->rec.chunk_id.id == SCTP_SHUTDOWN) ||
7040                     (chk->rec.chunk_id.id == SCTP_SHUTDOWN_ACK) ||
7041                     (chk->rec.chunk_id.id == SCTP_OPERATION_ERROR) ||
7042                     (chk->rec.chunk_id.id == SCTP_PACKET_DROPPED) ||
7043                     (chk->rec.chunk_id.id == SCTP_COOKIE_ACK) ||
7044                     (chk->rec.chunk_id.id == SCTP_ECN_CWR) ||
7045                     (chk->rec.chunk_id.id == SCTP_ASCONF_ACK)) {
7046                         /* Stray chunks must be cleaned up */
7047         clean_up_anyway:
7048                         TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
7049                         asoc->ctrl_queue_cnt--;
7050                         if (chk->data) {
7051                                 sctp_m_freem(chk->data);
7052                                 chk->data = NULL;
7053                         }
7054                         if (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN) {
7055                                 asoc->fwd_tsn_cnt--;
7056                         }
7057                         sctp_free_a_chunk(stcb, chk, so_locked);
7058                 } else if (chk->rec.chunk_id.id == SCTP_STREAM_RESET) {
7059                         /* special handling, we must look into the param */
7060                         if (chk != asoc->str_reset) {
7061                                 goto clean_up_anyway;
7062                         }
7063                 }
7064         }
7065 }
7066
7067 static uint32_t
7068 sctp_can_we_split_this(struct sctp_tcb *stcb, uint32_t length,
7069     uint32_t space_left, uint32_t frag_point, int eeor_on)
7070 {
7071         /*
7072          * Make a decision on if I should split a msg into multiple parts.
7073          * This is only asked of incomplete messages.
7074          */
7075         if (eeor_on) {
7076                 /*
7077                  * If we are doing EEOR we need to always send it if its the
7078                  * entire thing, since it might be all the guy is putting in
7079                  * the hopper.
7080                  */
7081                 if (space_left >= length) {
7082                         /*-
7083                          * If we have data outstanding,
7084                          * we get another chance when the sack
7085                          * arrives to transmit - wait for more data
7086                          */
7087                         if (stcb->asoc.total_flight == 0) {
7088                                 /*
7089                                  * If nothing is in flight, we zero the
7090                                  * packet counter.
7091                                  */
7092                                 return (length);
7093                         }
7094                         return (0);
7095
7096                 } else {
7097                         /* You can fill the rest */
7098                         return (space_left);
7099                 }
7100         }
7101         /*-
7102          * For those strange folk that make the send buffer
7103          * smaller than our fragmentation point, we can't
7104          * get a full msg in so we have to allow splitting.
7105          */
7106         if (SCTP_SB_LIMIT_SND(stcb->sctp_socket) < frag_point) {
7107                 return (length);
7108         }
7109         if ((length <= space_left) ||
7110             ((length - space_left) < SCTP_BASE_SYSCTL(sctp_min_residual))) {
7111                 /* Sub-optimial residual don't split in non-eeor mode. */
7112                 return (0);
7113         }
7114         /*
7115          * If we reach here length is larger than the space_left. Do we wish
7116          * to split it for the sake of packet putting together?
7117          */
7118         if (space_left >= min(SCTP_BASE_SYSCTL(sctp_min_split_point), frag_point)) {
7119                 /* Its ok to split it */
7120                 return (min(space_left, frag_point));
7121         }
7122         /* Nope, can't split */
7123         return (0);
7124 }
7125
7126 static uint32_t
7127 sctp_move_to_outqueue(struct sctp_tcb *stcb,
7128     struct sctp_stream_out *strq,
7129     uint32_t space_left,
7130     uint32_t frag_point,
7131     int *giveup,
7132     int eeor_mode,
7133     int *bail,
7134     int so_locked)
7135 {
7136         /* Move from the stream to the send_queue keeping track of the total */
7137         struct sctp_association *asoc;
7138         struct sctp_stream_queue_pending *sp;
7139         struct sctp_tmit_chunk *chk;
7140         struct sctp_data_chunk *dchkh = NULL;
7141         struct sctp_idata_chunk *ndchkh = NULL;
7142         uint32_t to_move, length;
7143         int leading;
7144         uint8_t rcv_flags = 0;
7145         uint8_t some_taken;
7146         uint8_t send_lock_up = 0;
7147
7148         SCTP_TCB_LOCK_ASSERT(stcb);
7149         asoc = &stcb->asoc;
7150 one_more_time:
7151         /* sa_ignore FREED_MEMORY */
7152         sp = TAILQ_FIRST(&strq->outqueue);
7153         if (sp == NULL) {
7154                 if (send_lock_up == 0) {
7155                         SCTP_TCB_SEND_LOCK(stcb);
7156                         send_lock_up = 1;
7157                 }
7158                 sp = TAILQ_FIRST(&strq->outqueue);
7159                 if (sp) {
7160                         goto one_more_time;
7161                 }
7162                 if ((sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_EXPLICIT_EOR) == 0) &&
7163                     (stcb->asoc.idata_supported == 0) &&
7164                     (strq->last_msg_incomplete)) {
7165                         SCTP_PRINTF("Huh? Stream:%d lm_in_c=%d but queue is NULL\n",
7166                             strq->sid,
7167                             strq->last_msg_incomplete);
7168                         strq->last_msg_incomplete = 0;
7169                 }
7170                 to_move = 0;
7171                 if (send_lock_up) {
7172                         SCTP_TCB_SEND_UNLOCK(stcb);
7173                         send_lock_up = 0;
7174                 }
7175                 goto out_of;
7176         }
7177         if ((sp->msg_is_complete) && (sp->length == 0)) {
7178                 if (sp->sender_all_done) {
7179                         /*
7180                          * We are doing deferred cleanup. Last time through
7181                          * when we took all the data the sender_all_done was
7182                          * not set.
7183                          */
7184                         if ((sp->put_last_out == 0) && (sp->discard_rest == 0)) {
7185                                 SCTP_PRINTF("Gak, put out entire msg with NO end!-1\n");
7186                                 SCTP_PRINTF("sender_done:%d len:%d msg_comp:%d put_last_out:%d send_lock:%d\n",
7187                                     sp->sender_all_done,
7188                                     sp->length,
7189                                     sp->msg_is_complete,
7190                                     sp->put_last_out,
7191                                     send_lock_up);
7192                         }
7193                         if ((TAILQ_NEXT(sp, next) == NULL) && (send_lock_up == 0)) {
7194                                 SCTP_TCB_SEND_LOCK(stcb);
7195                                 send_lock_up = 1;
7196                         }
7197                         atomic_subtract_int(&asoc->stream_queue_cnt, 1);
7198                         TAILQ_REMOVE(&strq->outqueue, sp, next);
7199                         stcb->asoc.ss_functions.sctp_ss_remove_from_stream(stcb, asoc, strq, sp, send_lock_up);
7200                         if ((strq->state == SCTP_STREAM_RESET_PENDING) &&
7201                             (strq->chunks_on_queues == 0) &&
7202                             TAILQ_EMPTY(&strq->outqueue)) {
7203                                 stcb->asoc.trigger_reset = 1;
7204                         }
7205                         if (sp->net) {
7206                                 sctp_free_remote_addr(sp->net);
7207                                 sp->net = NULL;
7208                         }
7209                         if (sp->data) {
7210                                 sctp_m_freem(sp->data);
7211                                 sp->data = NULL;
7212                         }
7213                         sctp_free_a_strmoq(stcb, sp, so_locked);
7214                         /* we can't be locked to it */
7215                         if (send_lock_up) {
7216                                 SCTP_TCB_SEND_UNLOCK(stcb);
7217                                 send_lock_up = 0;
7218                         }
7219                         /* back to get the next msg */
7220                         goto one_more_time;
7221                 } else {
7222                         /*
7223                          * sender just finished this but still holds a
7224                          * reference
7225                          */
7226                         *giveup = 1;
7227                         to_move = 0;
7228                         goto out_of;
7229                 }
7230         } else {
7231                 /* is there some to get */
7232                 if (sp->length == 0) {
7233                         /* no */
7234                         *giveup = 1;
7235                         to_move = 0;
7236                         goto out_of;
7237                 } else if (sp->discard_rest) {
7238                         if (send_lock_up == 0) {
7239                                 SCTP_TCB_SEND_LOCK(stcb);
7240                                 send_lock_up = 1;
7241                         }
7242                         /* Whack down the size */
7243                         atomic_subtract_int(&stcb->asoc.total_output_queue_size, sp->length);
7244                         if ((stcb->sctp_socket != NULL) &&
7245                             ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
7246                             (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL))) {
7247                                 atomic_subtract_int(&stcb->sctp_socket->so_snd.sb_cc, sp->length);
7248                         }
7249                         if (sp->data) {
7250                                 sctp_m_freem(sp->data);
7251                                 sp->data = NULL;
7252                                 sp->tail_mbuf = NULL;
7253                         }
7254                         sp->length = 0;
7255                         sp->some_taken = 1;
7256                         *giveup = 1;
7257                         to_move = 0;
7258                         goto out_of;
7259                 }
7260         }
7261         some_taken = sp->some_taken;
7262 re_look:
7263         length = sp->length;
7264         if (sp->msg_is_complete) {
7265                 /* The message is complete */
7266                 to_move = min(length, frag_point);
7267                 if (to_move == length) {
7268                         /* All of it fits in the MTU */
7269                         if (sp->some_taken) {
7270                                 rcv_flags |= SCTP_DATA_LAST_FRAG;
7271                         } else {
7272                                 rcv_flags |= SCTP_DATA_NOT_FRAG;
7273                         }
7274                         sp->put_last_out = 1;
7275                         if (sp->sinfo_flags & SCTP_SACK_IMMEDIATELY) {
7276                                 rcv_flags |= SCTP_DATA_SACK_IMMEDIATELY;
7277                         }
7278                 } else {
7279                         /* Not all of it fits, we fragment */
7280                         if (sp->some_taken == 0) {
7281                                 rcv_flags |= SCTP_DATA_FIRST_FRAG;
7282                         }
7283                         sp->some_taken = 1;
7284                 }
7285         } else {
7286                 to_move = sctp_can_we_split_this(stcb, length, space_left, frag_point, eeor_mode);
7287                 if (to_move) {
7288                         /*-
7289                          * We use a snapshot of length in case it
7290                          * is expanding during the compare.
7291                          */
7292                         uint32_t llen;
7293
7294                         llen = length;
7295                         if (to_move >= llen) {
7296                                 to_move = llen;
7297                                 if (send_lock_up == 0) {
7298                                         /*-
7299                                          * We are taking all of an incomplete msg
7300                                          * thus we need a send lock.
7301                                          */
7302                                         SCTP_TCB_SEND_LOCK(stcb);
7303                                         send_lock_up = 1;
7304                                         if (sp->msg_is_complete) {
7305                                                 /*
7306                                                  * the sender finished the
7307                                                  * msg
7308                                                  */
7309                                                 goto re_look;
7310                                         }
7311                                 }
7312                         }
7313                         if (sp->some_taken == 0) {
7314                                 rcv_flags |= SCTP_DATA_FIRST_FRAG;
7315                                 sp->some_taken = 1;
7316                         }
7317                 } else {
7318                         /* Nothing to take. */
7319                         *giveup = 1;
7320                         to_move = 0;
7321                         goto out_of;
7322                 }
7323         }
7324
7325         /* If we reach here, we can copy out a chunk */
7326         sctp_alloc_a_chunk(stcb, chk);
7327         if (chk == NULL) {
7328                 /* No chunk memory */
7329                 *giveup = 1;
7330                 to_move = 0;
7331                 goto out_of;
7332         }
7333         /*
7334          * Setup for unordered if needed by looking at the user sent info
7335          * flags.
7336          */
7337         if (sp->sinfo_flags & SCTP_UNORDERED) {
7338                 rcv_flags |= SCTP_DATA_UNORDERED;
7339         }
7340         if (SCTP_BASE_SYSCTL(sctp_enable_sack_immediately) &&
7341             (sp->sinfo_flags & SCTP_EOF) == SCTP_EOF) {
7342                 rcv_flags |= SCTP_DATA_SACK_IMMEDIATELY;
7343         }
7344         /* clear out the chunk before setting up */
7345         memset(chk, 0, sizeof(*chk));
7346         chk->rec.data.rcv_flags = rcv_flags;
7347
7348         if (to_move >= length) {
7349                 /* we think we can steal the whole thing */
7350                 if ((sp->sender_all_done == 0) && (send_lock_up == 0)) {
7351                         SCTP_TCB_SEND_LOCK(stcb);
7352                         send_lock_up = 1;
7353                 }
7354                 if (to_move < sp->length) {
7355                         /* bail, it changed */
7356                         goto dont_do_it;
7357                 }
7358                 chk->data = sp->data;
7359                 chk->last_mbuf = sp->tail_mbuf;
7360                 /* register the stealing */
7361                 sp->data = sp->tail_mbuf = NULL;
7362         } else {
7363                 struct mbuf *m;
7364
7365 dont_do_it:
7366                 chk->data = SCTP_M_COPYM(sp->data, 0, to_move, M_NOWAIT);
7367                 chk->last_mbuf = NULL;
7368                 if (chk->data == NULL) {
7369                         sp->some_taken = some_taken;
7370                         sctp_free_a_chunk(stcb, chk, so_locked);
7371                         *bail = 1;
7372                         to_move = 0;
7373                         goto out_of;
7374                 }
7375 #ifdef SCTP_MBUF_LOGGING
7376                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
7377                         sctp_log_mbc(chk->data, SCTP_MBUF_ICOPY);
7378                 }
7379 #endif
7380                 /* Pull off the data */
7381                 m_adj(sp->data, to_move);
7382                 /* Now lets work our way down and compact it */
7383                 m = sp->data;
7384                 while (m && (SCTP_BUF_LEN(m) == 0)) {
7385                         sp->data = SCTP_BUF_NEXT(m);
7386                         SCTP_BUF_NEXT(m) = NULL;
7387                         if (sp->tail_mbuf == m) {
7388                                 /*-
7389                                  * Freeing tail? TSNH since
7390                                  * we supposedly were taking less
7391                                  * than the sp->length.
7392                                  */
7393 #ifdef INVARIANTS
7394                                 panic("Huh, freing tail? - TSNH");
7395 #else
7396                                 SCTP_PRINTF("Huh, freeing tail? - TSNH\n");
7397                                 sp->tail_mbuf = sp->data = NULL;
7398                                 sp->length = 0;
7399 #endif
7400
7401                         }
7402                         sctp_m_free(m);
7403                         m = sp->data;
7404                 }
7405         }
7406         if (SCTP_BUF_IS_EXTENDED(chk->data)) {
7407                 chk->copy_by_ref = 1;
7408         } else {
7409                 chk->copy_by_ref = 0;
7410         }
7411         /*
7412          * get last_mbuf and counts of mb usage This is ugly but hopefully
7413          * its only one mbuf.
7414          */
7415         if (chk->last_mbuf == NULL) {
7416                 chk->last_mbuf = chk->data;
7417                 while (SCTP_BUF_NEXT(chk->last_mbuf) != NULL) {
7418                         chk->last_mbuf = SCTP_BUF_NEXT(chk->last_mbuf);
7419                 }
7420         }
7421
7422         if (to_move > length) {
7423                 /*- This should not happen either
7424                  * since we always lower to_move to the size
7425                  * of sp->length if its larger.
7426                  */
7427 #ifdef INVARIANTS
7428                 panic("Huh, how can to_move be larger?");
7429 #else
7430                 SCTP_PRINTF("Huh, how can to_move be larger?\n");
7431                 sp->length = 0;
7432 #endif
7433         } else {
7434                 atomic_subtract_int(&sp->length, to_move);
7435         }
7436         leading = SCTP_DATA_CHUNK_OVERHEAD(stcb);
7437         if (M_LEADINGSPACE(chk->data) < leading) {
7438                 /* Not enough room for a chunk header, get some */
7439                 struct mbuf *m;
7440
7441                 m = sctp_get_mbuf_for_msg(1, 0, M_NOWAIT, 1, MT_DATA);
7442                 if (m == NULL) {
7443                         /*
7444                          * we're in trouble here. _PREPEND below will free
7445                          * all the data if there is no leading space, so we
7446                          * must put the data back and restore.
7447                          */
7448                         if (send_lock_up == 0) {
7449                                 SCTP_TCB_SEND_LOCK(stcb);
7450                                 send_lock_up = 1;
7451                         }
7452                         if (sp->data == NULL) {
7453                                 /* unsteal the data */
7454                                 sp->data = chk->data;
7455                                 sp->tail_mbuf = chk->last_mbuf;
7456                         } else {
7457                                 struct mbuf *m_tmp;
7458
7459                                 /* reassemble the data */
7460                                 m_tmp = sp->data;
7461                                 sp->data = chk->data;
7462                                 SCTP_BUF_NEXT(chk->last_mbuf) = m_tmp;
7463                         }
7464                         sp->some_taken = some_taken;
7465                         atomic_add_int(&sp->length, to_move);
7466                         chk->data = NULL;
7467                         *bail = 1;
7468                         sctp_free_a_chunk(stcb, chk, so_locked);
7469                         to_move = 0;
7470                         goto out_of;
7471                 } else {
7472                         SCTP_BUF_LEN(m) = 0;
7473                         SCTP_BUF_NEXT(m) = chk->data;
7474                         chk->data = m;
7475                         M_ALIGN(chk->data, 4);
7476                 }
7477         }
7478         SCTP_BUF_PREPEND(chk->data, SCTP_DATA_CHUNK_OVERHEAD(stcb), M_NOWAIT);
7479         if (chk->data == NULL) {
7480                 /* HELP, TSNH since we assured it would not above? */
7481 #ifdef INVARIANTS
7482                 panic("prepend failes HELP?");
7483 #else
7484                 SCTP_PRINTF("prepend fails HELP?\n");
7485                 sctp_free_a_chunk(stcb, chk, so_locked);
7486 #endif
7487                 *bail = 1;
7488                 to_move = 0;
7489                 goto out_of;
7490         }
7491         sctp_snd_sb_alloc(stcb, SCTP_DATA_CHUNK_OVERHEAD(stcb));
7492         chk->book_size = chk->send_size = (uint16_t)(to_move + SCTP_DATA_CHUNK_OVERHEAD(stcb));
7493         chk->book_size_scale = 0;
7494         chk->sent = SCTP_DATAGRAM_UNSENT;
7495
7496         chk->flags = 0;
7497         chk->asoc = &stcb->asoc;
7498         chk->pad_inplace = 0;
7499         chk->no_fr_allowed = 0;
7500         if (stcb->asoc.idata_supported == 0) {
7501                 if (rcv_flags & SCTP_DATA_UNORDERED) {
7502                         /* Just use 0. The receiver ignores the values. */
7503                         chk->rec.data.mid = 0;
7504                 } else {
7505                         chk->rec.data.mid = strq->next_mid_ordered;
7506                         if (rcv_flags & SCTP_DATA_LAST_FRAG) {
7507                                 strq->next_mid_ordered++;
7508                         }
7509                 }
7510         } else {
7511                 if (rcv_flags & SCTP_DATA_UNORDERED) {
7512                         chk->rec.data.mid = strq->next_mid_unordered;
7513                         if (rcv_flags & SCTP_DATA_LAST_FRAG) {
7514                                 strq->next_mid_unordered++;
7515                         }
7516                 } else {
7517                         chk->rec.data.mid = strq->next_mid_ordered;
7518                         if (rcv_flags & SCTP_DATA_LAST_FRAG) {
7519                                 strq->next_mid_ordered++;
7520                         }
7521                 }
7522         }
7523         chk->rec.data.sid = sp->sid;
7524         chk->rec.data.ppid = sp->ppid;
7525         chk->rec.data.context = sp->context;
7526         chk->rec.data.doing_fast_retransmit = 0;
7527
7528         chk->rec.data.timetodrop = sp->ts;
7529         chk->flags = sp->act_flags;
7530
7531         if (sp->net) {
7532                 chk->whoTo = sp->net;
7533                 atomic_add_int(&chk->whoTo->ref_count, 1);
7534         } else
7535                 chk->whoTo = NULL;
7536
7537         if (sp->holds_key_ref) {
7538                 chk->auth_keyid = sp->auth_keyid;
7539                 sctp_auth_key_acquire(stcb, chk->auth_keyid);
7540                 chk->holds_key_ref = 1;
7541         }
7542         chk->rec.data.tsn = atomic_fetchadd_int(&asoc->sending_seq, 1);
7543         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_AT_SEND_2_OUTQ) {
7544                 sctp_misc_ints(SCTP_STRMOUT_LOG_SEND,
7545                     (uint32_t)(uintptr_t)stcb, sp->length,
7546                     (uint32_t)((chk->rec.data.sid << 16) | (0x0000ffff & chk->rec.data.mid)),
7547                     chk->rec.data.tsn);
7548         }
7549         if (stcb->asoc.idata_supported == 0) {
7550                 dchkh = mtod(chk->data, struct sctp_data_chunk *);
7551         } else {
7552                 ndchkh = mtod(chk->data, struct sctp_idata_chunk *);
7553         }
7554         /*
7555          * Put the rest of the things in place now. Size was done earlier in
7556          * previous loop prior to padding.
7557          */
7558
7559 #ifdef SCTP_ASOCLOG_OF_TSNS
7560         SCTP_TCB_LOCK_ASSERT(stcb);
7561         if (asoc->tsn_out_at >= SCTP_TSN_LOG_SIZE) {
7562                 asoc->tsn_out_at = 0;
7563                 asoc->tsn_out_wrapped = 1;
7564         }
7565         asoc->out_tsnlog[asoc->tsn_out_at].tsn = chk->rec.data.tsn;
7566         asoc->out_tsnlog[asoc->tsn_out_at].strm = chk->rec.data.sid;
7567         asoc->out_tsnlog[asoc->tsn_out_at].seq = chk->rec.data.mid;
7568         asoc->out_tsnlog[asoc->tsn_out_at].sz = chk->send_size;
7569         asoc->out_tsnlog[asoc->tsn_out_at].flgs = chk->rec.data.rcv_flags;
7570         asoc->out_tsnlog[asoc->tsn_out_at].stcb = (void *)stcb;
7571         asoc->out_tsnlog[asoc->tsn_out_at].in_pos = asoc->tsn_out_at;
7572         asoc->out_tsnlog[asoc->tsn_out_at].in_out = 2;
7573         asoc->tsn_out_at++;
7574 #endif
7575         if (stcb->asoc.idata_supported == 0) {
7576                 dchkh->ch.chunk_type = SCTP_DATA;
7577                 dchkh->ch.chunk_flags = chk->rec.data.rcv_flags;
7578                 dchkh->dp.tsn = htonl(chk->rec.data.tsn);
7579                 dchkh->dp.sid = htons(strq->sid);
7580                 dchkh->dp.ssn = htons((uint16_t)chk->rec.data.mid);
7581                 dchkh->dp.ppid = chk->rec.data.ppid;
7582                 dchkh->ch.chunk_length = htons(chk->send_size);
7583         } else {
7584                 ndchkh->ch.chunk_type = SCTP_IDATA;
7585                 ndchkh->ch.chunk_flags = chk->rec.data.rcv_flags;
7586                 ndchkh->dp.tsn = htonl(chk->rec.data.tsn);
7587                 ndchkh->dp.sid = htons(strq->sid);
7588                 ndchkh->dp.reserved = htons(0);
7589                 ndchkh->dp.mid = htonl(chk->rec.data.mid);
7590                 if (sp->fsn == 0)
7591                         ndchkh->dp.ppid_fsn.ppid = chk->rec.data.ppid;
7592                 else
7593                         ndchkh->dp.ppid_fsn.fsn = htonl(sp->fsn);
7594                 sp->fsn++;
7595                 ndchkh->ch.chunk_length = htons(chk->send_size);
7596         }
7597         /* Now advance the chk->send_size by the actual pad needed. */
7598         if (chk->send_size < SCTP_SIZE32(chk->book_size)) {
7599                 /* need a pad */
7600                 struct mbuf *lm;
7601                 int pads;
7602
7603                 pads = SCTP_SIZE32(chk->book_size) - chk->send_size;
7604                 lm = sctp_pad_lastmbuf(chk->data, pads, chk->last_mbuf);
7605                 if (lm != NULL) {
7606                         chk->last_mbuf = lm;
7607                         chk->pad_inplace = 1;
7608                 }
7609                 chk->send_size += pads;
7610         }
7611         if (PR_SCTP_ENABLED(chk->flags)) {
7612                 asoc->pr_sctp_cnt++;
7613         }
7614         if (sp->msg_is_complete && (sp->length == 0) && (sp->sender_all_done)) {
7615                 /* All done pull and kill the message */
7616                 if (sp->put_last_out == 0) {
7617                         SCTP_PRINTF("Gak, put out entire msg with NO end!-2\n");
7618                         SCTP_PRINTF("sender_done:%d len:%d msg_comp:%d put_last_out:%d send_lock:%d\n",
7619                             sp->sender_all_done,
7620                             sp->length,
7621                             sp->msg_is_complete,
7622                             sp->put_last_out,
7623                             send_lock_up);
7624                 }
7625                 if ((send_lock_up == 0) && (TAILQ_NEXT(sp, next) == NULL)) {
7626                         SCTP_TCB_SEND_LOCK(stcb);
7627                         send_lock_up = 1;
7628                 }
7629                 atomic_subtract_int(&asoc->stream_queue_cnt, 1);
7630                 TAILQ_REMOVE(&strq->outqueue, sp, next);
7631                 stcb->asoc.ss_functions.sctp_ss_remove_from_stream(stcb, asoc, strq, sp, send_lock_up);
7632                 if ((strq->state == SCTP_STREAM_RESET_PENDING) &&
7633                     (strq->chunks_on_queues == 0) &&
7634                     TAILQ_EMPTY(&strq->outqueue)) {
7635                         stcb->asoc.trigger_reset = 1;
7636                 }
7637                 if (sp->net) {
7638                         sctp_free_remote_addr(sp->net);
7639                         sp->net = NULL;
7640                 }
7641                 if (sp->data) {
7642                         sctp_m_freem(sp->data);
7643                         sp->data = NULL;
7644                 }
7645                 sctp_free_a_strmoq(stcb, sp, so_locked);
7646         }
7647         asoc->chunks_on_out_queue++;
7648         strq->chunks_on_queues++;
7649         TAILQ_INSERT_TAIL(&asoc->send_queue, chk, sctp_next);
7650         asoc->send_queue_cnt++;
7651 out_of:
7652         if (send_lock_up) {
7653                 SCTP_TCB_SEND_UNLOCK(stcb);
7654         }
7655         return (to_move);
7656 }
7657
7658
7659 static void
7660 sctp_fill_outqueue(struct sctp_tcb *stcb,
7661     struct sctp_nets *net, int frag_point, int eeor_mode, int *quit_now, int so_locked)
7662 {
7663         struct sctp_association *asoc;
7664         struct sctp_stream_out *strq;
7665         uint32_t space_left, moved, total_moved;
7666         int bail, giveup;
7667
7668         SCTP_TCB_LOCK_ASSERT(stcb);
7669         asoc = &stcb->asoc;
7670         total_moved = 0;
7671         switch (net->ro._l_addr.sa.sa_family) {
7672 #ifdef INET
7673         case AF_INET:
7674                 space_left = net->mtu - SCTP_MIN_V4_OVERHEAD;
7675                 break;
7676 #endif
7677 #ifdef INET6
7678         case AF_INET6:
7679                 space_left = net->mtu - SCTP_MIN_OVERHEAD;
7680                 break;
7681 #endif
7682         default:
7683                 /* TSNH */
7684                 space_left = net->mtu;
7685                 break;
7686         }
7687         /* Need an allowance for the data chunk header too */
7688         space_left -= SCTP_DATA_CHUNK_OVERHEAD(stcb);
7689
7690         /* must make even word boundary */
7691         space_left &= 0xfffffffc;
7692         strq = stcb->asoc.ss_functions.sctp_ss_select_stream(stcb, net, asoc);
7693         giveup = 0;
7694         bail = 0;
7695         while ((space_left > 0) && (strq != NULL)) {
7696                 moved = sctp_move_to_outqueue(stcb, strq, space_left, frag_point,
7697                     &giveup, eeor_mode, &bail, so_locked);
7698                 stcb->asoc.ss_functions.sctp_ss_scheduled(stcb, net, asoc, strq, moved);
7699                 if ((giveup != 0) || (bail != 0)) {
7700                         break;
7701                 }
7702                 strq = stcb->asoc.ss_functions.sctp_ss_select_stream(stcb, net, asoc);
7703                 total_moved += moved;
7704                 if (space_left >= moved) {
7705                         space_left -= moved;
7706                 } else {
7707                         space_left = 0;
7708                 }
7709                 if (space_left >= SCTP_DATA_CHUNK_OVERHEAD(stcb)) {
7710                         space_left -= SCTP_DATA_CHUNK_OVERHEAD(stcb);
7711                 } else {
7712                         space_left = 0;
7713                 }
7714                 space_left &= 0xfffffffc;
7715         }
7716         if (bail != 0)
7717                 *quit_now = 1;
7718
7719         stcb->asoc.ss_functions.sctp_ss_packet_done(stcb, net, asoc);
7720
7721         if (total_moved == 0) {
7722                 if ((stcb->asoc.sctp_cmt_on_off == 0) &&
7723                     (net == stcb->asoc.primary_destination)) {
7724                         /* ran dry for primary network net */
7725                         SCTP_STAT_INCR(sctps_primary_randry);
7726                 } else if (stcb->asoc.sctp_cmt_on_off > 0) {
7727                         /* ran dry with CMT on */
7728                         SCTP_STAT_INCR(sctps_cmt_randry);
7729                 }
7730         }
7731 }
7732
7733 void
7734 sctp_fix_ecn_echo(struct sctp_association *asoc)
7735 {
7736         struct sctp_tmit_chunk *chk;
7737
7738         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
7739                 if (chk->rec.chunk_id.id == SCTP_ECN_ECHO) {
7740                         chk->sent = SCTP_DATAGRAM_UNSENT;
7741                 }
7742         }
7743 }
7744
7745 void
7746 sctp_move_chunks_from_net(struct sctp_tcb *stcb, struct sctp_nets *net)
7747 {
7748         struct sctp_association *asoc;
7749         struct sctp_tmit_chunk *chk;
7750         struct sctp_stream_queue_pending *sp;
7751         unsigned int i;
7752
7753         if (net == NULL) {
7754                 return;
7755         }
7756         asoc = &stcb->asoc;
7757         for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
7758                 TAILQ_FOREACH(sp, &stcb->asoc.strmout[i].outqueue, next) {
7759                         if (sp->net == net) {
7760                                 sctp_free_remote_addr(sp->net);
7761                                 sp->net = NULL;
7762                         }
7763                 }
7764         }
7765         TAILQ_FOREACH(chk, &asoc->send_queue, sctp_next) {
7766                 if (chk->whoTo == net) {
7767                         sctp_free_remote_addr(chk->whoTo);
7768                         chk->whoTo = NULL;
7769                 }
7770         }
7771 }
7772
7773 int
7774 sctp_med_chunk_output(struct sctp_inpcb *inp,
7775     struct sctp_tcb *stcb,
7776     struct sctp_association *asoc,
7777     int *num_out,
7778     int *reason_code,
7779     int control_only, int from_where,
7780     struct timeval *now, int *now_filled, int frag_point, int so_locked)
7781 {
7782         /**
7783          * Ok this is the generic chunk service queue. we must do the
7784          * following:
7785          * - Service the stream queue that is next, moving any
7786          *   message (note I must get a complete message i.e. FIRST/MIDDLE and
7787          *   LAST to the out queue in one pass) and assigning TSN's. This
7788          *   only applys though if the peer does not support NDATA. For NDATA
7789          *   chunks its ok to not send the entire message ;-)
7790          * - Check to see if the cwnd/rwnd allows any output, if so we go ahead and
7791          *   fomulate and send the low level chunks. Making sure to combine
7792          *   any control in the control chunk queue also.
7793          */
7794         struct sctp_nets *net, *start_at, *sack_goes_to = NULL, *old_start_at = NULL;
7795         struct mbuf *outchain, *endoutchain;
7796         struct sctp_tmit_chunk *chk, *nchk;
7797
7798         /* temp arrays for unlinking */
7799         struct sctp_tmit_chunk *data_list[SCTP_MAX_DATA_BUNDLING];
7800         int no_fragmentflg, error;
7801         unsigned int max_rwnd_per_dest, max_send_per_dest;
7802         int one_chunk, hbflag, skip_data_for_this_net;
7803         int asconf, cookie, no_out_cnt;
7804         int bundle_at, ctl_cnt, no_data_chunks, eeor_mode;
7805         unsigned int mtu, r_mtu, omtu, mx_mtu, to_out;
7806         int tsns_sent = 0;
7807         uint32_t auth_offset;
7808         struct sctp_auth_chunk *auth;
7809         uint16_t auth_keyid;
7810         int override_ok = 1;
7811         int skip_fill_up = 0;
7812         int data_auth_reqd = 0;
7813
7814         /*
7815          * JRS 5/14/07 - Add flag for whether a heartbeat is sent to the
7816          * destination.
7817          */
7818         int quit_now = 0;
7819
7820         *num_out = 0;
7821         *reason_code = 0;
7822         auth_keyid = stcb->asoc.authinfo.active_keyid;
7823         if ((asoc->state & SCTP_STATE_SHUTDOWN_PENDING) ||
7824             (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_RECEIVED) ||
7825             (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_EXPLICIT_EOR))) {
7826                 eeor_mode = 1;
7827         } else {
7828                 eeor_mode = 0;
7829         }
7830         ctl_cnt = no_out_cnt = asconf = cookie = 0;
7831         /*
7832          * First lets prime the pump. For each destination, if there is room
7833          * in the flight size, attempt to pull an MTU's worth out of the
7834          * stream queues into the general send_queue
7835          */
7836 #ifdef SCTP_AUDITING_ENABLED
7837         sctp_audit_log(0xC2, 2);
7838 #endif
7839         SCTP_TCB_LOCK_ASSERT(stcb);
7840         hbflag = 0;
7841         if (control_only)
7842                 no_data_chunks = 1;
7843         else
7844                 no_data_chunks = 0;
7845
7846         /* Nothing to possible to send? */
7847         if ((TAILQ_EMPTY(&asoc->control_send_queue) ||
7848             (asoc->ctrl_queue_cnt == stcb->asoc.ecn_echo_cnt_onq)) &&
7849             TAILQ_EMPTY(&asoc->asconf_send_queue) &&
7850             TAILQ_EMPTY(&asoc->send_queue) &&
7851             sctp_is_there_unsent_data(stcb, so_locked) == 0) {
7852 nothing_to_send:
7853                 *reason_code = 9;
7854                 return (0);
7855         }
7856         if (asoc->peers_rwnd == 0) {
7857                 /* No room in peers rwnd */
7858                 *reason_code = 1;
7859                 if (asoc->total_flight > 0) {
7860                         /* we are allowed one chunk in flight */
7861                         no_data_chunks = 1;
7862                 }
7863         }
7864         if (stcb->asoc.ecn_echo_cnt_onq) {
7865                 /* Record where a sack goes, if any */
7866                 if (no_data_chunks &&
7867                     (asoc->ctrl_queue_cnt == stcb->asoc.ecn_echo_cnt_onq)) {
7868                         /* Nothing but ECNe to send - we don't do that */
7869                         goto nothing_to_send;
7870                 }
7871                 TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
7872                         if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
7873                             (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK)) {
7874                                 sack_goes_to = chk->whoTo;
7875                                 break;
7876                         }
7877                 }
7878         }
7879         max_rwnd_per_dest = ((asoc->peers_rwnd + asoc->total_flight) / asoc->numnets);
7880         if (stcb->sctp_socket)
7881                 max_send_per_dest = SCTP_SB_LIMIT_SND(stcb->sctp_socket) / asoc->numnets;
7882         else
7883                 max_send_per_dest = 0;
7884         if (no_data_chunks == 0) {
7885                 /* How many non-directed chunks are there? */
7886                 TAILQ_FOREACH(chk, &asoc->send_queue, sctp_next) {
7887                         if (chk->whoTo == NULL) {
7888                                 /*
7889                                  * We already have non-directed chunks on
7890                                  * the queue, no need to do a fill-up.
7891                                  */
7892                                 skip_fill_up = 1;
7893                                 break;
7894                         }
7895                 }
7896
7897         }
7898         if ((no_data_chunks == 0) &&
7899             (skip_fill_up == 0) &&
7900             (!stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc))) {
7901                 TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
7902                         /*
7903                          * This for loop we are in takes in each net, if
7904                          * its's got space in cwnd and has data sent to it
7905                          * (when CMT is off) then it calls
7906                          * sctp_fill_outqueue for the net. This gets data on
7907                          * the send queue for that network.
7908                          *
7909                          * In sctp_fill_outqueue TSN's are assigned and data
7910                          * is copied out of the stream buffers. Note mostly
7911                          * copy by reference (we hope).
7912                          */
7913                         net->window_probe = 0;
7914                         if ((net != stcb->asoc.alternate) &&
7915                             ((net->dest_state & SCTP_ADDR_PF) ||
7916                             (!(net->dest_state & SCTP_ADDR_REACHABLE)) ||
7917                             (net->dest_state & SCTP_ADDR_UNCONFIRMED))) {
7918                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
7919                                         sctp_log_cwnd(stcb, net, 1,
7920                                             SCTP_CWND_LOG_FILL_OUTQ_CALLED);
7921                                 }
7922                                 continue;
7923                         }
7924                         if ((stcb->asoc.cc_functions.sctp_cwnd_new_transmission_begins) &&
7925                             (net->flight_size == 0)) {
7926                                 (*stcb->asoc.cc_functions.sctp_cwnd_new_transmission_begins) (stcb, net);
7927                         }
7928                         if (net->flight_size >= net->cwnd) {
7929                                 /* skip this network, no room - can't fill */
7930                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
7931                                         sctp_log_cwnd(stcb, net, 3,
7932                                             SCTP_CWND_LOG_FILL_OUTQ_CALLED);
7933                                 }
7934                                 continue;
7935                         }
7936                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
7937                                 sctp_log_cwnd(stcb, net, 4, SCTP_CWND_LOG_FILL_OUTQ_CALLED);
7938                         }
7939                         sctp_fill_outqueue(stcb, net, frag_point, eeor_mode, &quit_now, so_locked);
7940                         if (quit_now) {
7941                                 /* memory alloc failure */
7942                                 no_data_chunks = 1;
7943                                 break;
7944                         }
7945                 }
7946         }
7947         /* now service each destination and send out what we can for it */
7948         /* Nothing to send? */
7949         if (TAILQ_EMPTY(&asoc->control_send_queue) &&
7950             TAILQ_EMPTY(&asoc->asconf_send_queue) &&
7951             TAILQ_EMPTY(&asoc->send_queue)) {
7952                 *reason_code = 8;
7953                 return (0);
7954         }
7955
7956         if (asoc->sctp_cmt_on_off > 0) {
7957                 /* get the last start point */
7958                 start_at = asoc->last_net_cmt_send_started;
7959                 if (start_at == NULL) {
7960                         /* null so to beginning */
7961                         start_at = TAILQ_FIRST(&asoc->nets);
7962                 } else {
7963                         start_at = TAILQ_NEXT(asoc->last_net_cmt_send_started, sctp_next);
7964                         if (start_at == NULL) {
7965                                 start_at = TAILQ_FIRST(&asoc->nets);
7966                         }
7967                 }
7968                 asoc->last_net_cmt_send_started = start_at;
7969         } else {
7970                 start_at = TAILQ_FIRST(&asoc->nets);
7971         }
7972         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
7973                 if (chk->whoTo == NULL) {
7974                         if (asoc->alternate) {
7975                                 chk->whoTo = asoc->alternate;
7976                         } else {
7977                                 chk->whoTo = asoc->primary_destination;
7978                         }
7979                         atomic_add_int(&chk->whoTo->ref_count, 1);
7980                 }
7981         }
7982         old_start_at = NULL;
7983 again_one_more_time:
7984         for (net = start_at; net != NULL; net = TAILQ_NEXT(net, sctp_next)) {
7985                 /* how much can we send? */
7986                 /* SCTPDBG("Examine for sending net:%x\n", (uint32_t)net); */
7987                 if (old_start_at && (old_start_at == net)) {
7988                         /* through list ocmpletely. */
7989                         break;
7990                 }
7991                 tsns_sent = 0xa;
7992                 if (TAILQ_EMPTY(&asoc->control_send_queue) &&
7993                     TAILQ_EMPTY(&asoc->asconf_send_queue) &&
7994                     (net->flight_size >= net->cwnd)) {
7995                         /*
7996                          * Nothing on control or asconf and flight is full,
7997                          * we can skip even in the CMT case.
7998                          */
7999                         continue;
8000                 }
8001                 bundle_at = 0;
8002                 endoutchain = outchain = NULL;
8003                 auth = NULL;
8004                 auth_offset = 0;
8005                 no_fragmentflg = 1;
8006                 one_chunk = 0;
8007                 if (net->dest_state & SCTP_ADDR_UNCONFIRMED) {
8008                         skip_data_for_this_net = 1;
8009                 } else {
8010                         skip_data_for_this_net = 0;
8011                 }
8012                 switch (((struct sockaddr *)&net->ro._l_addr)->sa_family) {
8013 #ifdef INET
8014                 case AF_INET:
8015                         mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
8016                         break;
8017 #endif
8018 #ifdef INET6
8019                 case AF_INET6:
8020                         mtu = net->mtu - SCTP_MIN_OVERHEAD;
8021                         break;
8022 #endif
8023                 default:
8024                         /* TSNH */
8025                         mtu = net->mtu;
8026                         break;
8027                 }
8028                 mx_mtu = mtu;
8029                 to_out = 0;
8030                 if (mtu > asoc->peers_rwnd) {
8031                         if (asoc->total_flight > 0) {
8032                                 /* We have a packet in flight somewhere */
8033                                 r_mtu = asoc->peers_rwnd;
8034                         } else {
8035                                 /* We are always allowed to send one MTU out */
8036                                 one_chunk = 1;
8037                                 r_mtu = mtu;
8038                         }
8039                 } else {
8040                         r_mtu = mtu;
8041                 }
8042                 error = 0;
8043                 /************************/
8044                 /* ASCONF transmission */
8045                 /************************/
8046                 /* Now first lets go through the asconf queue */
8047                 TAILQ_FOREACH_SAFE(chk, &asoc->asconf_send_queue, sctp_next, nchk) {
8048                         if (chk->rec.chunk_id.id != SCTP_ASCONF) {
8049                                 continue;
8050                         }
8051                         if (chk->whoTo == NULL) {
8052                                 if (asoc->alternate == NULL) {
8053                                         if (asoc->primary_destination != net) {
8054                                                 break;
8055                                         }
8056                                 } else {
8057                                         if (asoc->alternate != net) {
8058                                                 break;
8059                                         }
8060                                 }
8061                         } else {
8062                                 if (chk->whoTo != net) {
8063                                         break;
8064                                 }
8065                         }
8066                         if (chk->data == NULL) {
8067                                 break;
8068                         }
8069                         if (chk->sent != SCTP_DATAGRAM_UNSENT &&
8070                             chk->sent != SCTP_DATAGRAM_RESEND) {
8071                                 break;
8072                         }
8073                         /*
8074                          * if no AUTH is yet included and this chunk
8075                          * requires it, make sure to account for it.  We
8076                          * don't apply the size until the AUTH chunk is
8077                          * actually added below in case there is no room for
8078                          * this chunk. NOTE: we overload the use of "omtu"
8079                          * here
8080                          */
8081                         if ((auth == NULL) &&
8082                             sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
8083                             stcb->asoc.peer_auth_chunks)) {
8084                                 omtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
8085                         } else
8086                                 omtu = 0;
8087                         /* Here we do NOT factor the r_mtu */
8088                         if ((chk->send_size < (int)(mtu - omtu)) ||
8089                             (chk->flags & CHUNK_FLAGS_FRAGMENT_OK)) {
8090                                 /*
8091                                  * We probably should glom the mbuf chain
8092                                  * from the chk->data for control but the
8093                                  * problem is it becomes yet one more level
8094                                  * of tracking to do if for some reason
8095                                  * output fails. Then I have got to
8096                                  * reconstruct the merged control chain.. el
8097                                  * yucko.. for now we take the easy way and
8098                                  * do the copy
8099                                  */
8100                                 /*
8101                                  * Add an AUTH chunk, if chunk requires it
8102                                  * save the offset into the chain for AUTH
8103                                  */
8104                                 if ((auth == NULL) &&
8105                                     (sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
8106                                     stcb->asoc.peer_auth_chunks))) {
8107                                         outchain = sctp_add_auth_chunk(outchain,
8108                                             &endoutchain,
8109                                             &auth,
8110                                             &auth_offset,
8111                                             stcb,
8112                                             chk->rec.chunk_id.id);
8113                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8114                                 }
8115                                 outchain = sctp_copy_mbufchain(chk->data, outchain, &endoutchain,
8116                                     (int)chk->rec.chunk_id.can_take_data,
8117                                     chk->send_size, chk->copy_by_ref);
8118                                 if (outchain == NULL) {
8119                                         *reason_code = 8;
8120                                         SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
8121                                         return (ENOMEM);
8122                                 }
8123                                 SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8124                                 /* update our MTU size */
8125                                 if (mtu > (chk->send_size + omtu))
8126                                         mtu -= (chk->send_size + omtu);
8127                                 else
8128                                         mtu = 0;
8129                                 to_out += (chk->send_size + omtu);
8130                                 /* Do clear IP_DF ? */
8131                                 if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
8132                                         no_fragmentflg = 0;
8133                                 }
8134                                 if (chk->rec.chunk_id.can_take_data)
8135                                         chk->data = NULL;
8136                                 /*
8137                                  * set hb flag since we can use these for
8138                                  * RTO
8139                                  */
8140                                 hbflag = 1;
8141                                 asconf = 1;
8142                                 /*
8143                                  * should sysctl this: don't bundle data
8144                                  * with ASCONF since it requires AUTH
8145                                  */
8146                                 no_data_chunks = 1;
8147                                 chk->sent = SCTP_DATAGRAM_SENT;
8148                                 if (chk->whoTo == NULL) {
8149                                         chk->whoTo = net;
8150                                         atomic_add_int(&net->ref_count, 1);
8151                                 }
8152                                 chk->snd_count++;
8153                                 if (mtu == 0) {
8154                                         /*
8155                                          * Ok we are out of room but we can
8156                                          * output without effecting the
8157                                          * flight size since this little guy
8158                                          * is a control only packet.
8159                                          */
8160                                         sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp, stcb, net);
8161                                         /*
8162                                          * do NOT clear the asconf flag as
8163                                          * it is used to do appropriate
8164                                          * source address selection.
8165                                          */
8166                                         if (*now_filled == 0) {
8167                                                 (void)SCTP_GETTIME_TIMEVAL(now);
8168                                                 *now_filled = 1;
8169                                         }
8170                                         net->last_sent_time = *now;
8171                                         hbflag = 0;
8172                                         if ((error = sctp_lowlevel_chunk_output(inp, stcb, net,
8173                                             (struct sockaddr *)&net->ro._l_addr,
8174                                             outchain, auth_offset, auth,
8175                                             stcb->asoc.authinfo.active_keyid,
8176                                             no_fragmentflg, 0, asconf,
8177                                             inp->sctp_lport, stcb->rport,
8178                                             htonl(stcb->asoc.peer_vtag),
8179                                             net->port, NULL,
8180                                             0, 0,
8181                                             so_locked))) {
8182                                                 /*
8183                                                  * error, we could not
8184                                                  * output
8185                                                  */
8186                                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
8187                                                 if (from_where == 0) {
8188                                                         SCTP_STAT_INCR(sctps_lowlevelerrusr);
8189                                                 }
8190                                                 if (error == ENOBUFS) {
8191                                                         asoc->ifp_had_enobuf = 1;
8192                                                         SCTP_STAT_INCR(sctps_lowlevelerr);
8193                                                 }
8194                                                 /* error, could not output */
8195                                                 if (error == EHOSTUNREACH) {
8196                                                         /*
8197                                                          * Destination went
8198                                                          * unreachable
8199                                                          * during this send
8200                                                          */
8201                                                         sctp_move_chunks_from_net(stcb, net);
8202                                                 }
8203                                                 *reason_code = 7;
8204                                                 break;
8205                                         } else {
8206                                                 asoc->ifp_had_enobuf = 0;
8207                                         }
8208                                         /*
8209                                          * increase the number we sent, if a
8210                                          * cookie is sent we don't tell them
8211                                          * any was sent out.
8212                                          */
8213                                         outchain = endoutchain = NULL;
8214                                         auth = NULL;
8215                                         auth_offset = 0;
8216                                         if (!no_out_cnt)
8217                                                 *num_out += ctl_cnt;
8218                                         /* recalc a clean slate and setup */
8219                                         switch (net->ro._l_addr.sa.sa_family) {
8220 #ifdef INET
8221                                         case AF_INET:
8222                                                 mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
8223                                                 break;
8224 #endif
8225 #ifdef INET6
8226                                         case AF_INET6:
8227                                                 mtu = net->mtu - SCTP_MIN_OVERHEAD;
8228                                                 break;
8229 #endif
8230                                         default:
8231                                                 /* TSNH */
8232                                                 mtu = net->mtu;
8233                                                 break;
8234                                         }
8235                                         to_out = 0;
8236                                         no_fragmentflg = 1;
8237                                 }
8238                         }
8239                 }
8240                 if (error != 0) {
8241                         /* try next net */
8242                         continue;
8243                 }
8244                 /************************/
8245                 /* Control transmission */
8246                 /************************/
8247                 /* Now first lets go through the control queue */
8248                 TAILQ_FOREACH_SAFE(chk, &asoc->control_send_queue, sctp_next, nchk) {
8249                         if ((sack_goes_to) &&
8250                             (chk->rec.chunk_id.id == SCTP_ECN_ECHO) &&
8251                             (chk->whoTo != sack_goes_to)) {
8252                                 /*
8253                                  * if we have a sack in queue, and we are
8254                                  * looking at an ecn echo that is NOT queued
8255                                  * to where the sack is going..
8256                                  */
8257                                 if (chk->whoTo == net) {
8258                                         /*
8259                                          * Don't transmit it to where its
8260                                          * going (current net)
8261                                          */
8262                                         continue;
8263                                 } else if (sack_goes_to == net) {
8264                                         /*
8265                                          * But do transmit it to this
8266                                          * address
8267                                          */
8268                                         goto skip_net_check;
8269                                 }
8270                         }
8271                         if (chk->whoTo == NULL) {
8272                                 if (asoc->alternate == NULL) {
8273                                         if (asoc->primary_destination != net) {
8274                                                 continue;
8275                                         }
8276                                 } else {
8277                                         if (asoc->alternate != net) {
8278                                                 continue;
8279                                         }
8280                                 }
8281                         } else {
8282                                 if (chk->whoTo != net) {
8283                                         continue;
8284                                 }
8285                         }
8286         skip_net_check:
8287                         if (chk->data == NULL) {
8288                                 continue;
8289                         }
8290                         if (chk->sent != SCTP_DATAGRAM_UNSENT) {
8291                                 /*
8292                                  * It must be unsent. Cookies and ASCONF's
8293                                  * hang around but there timers will force
8294                                  * when marked for resend.
8295                                  */
8296                                 continue;
8297                         }
8298                         /*
8299                          * if no AUTH is yet included and this chunk
8300                          * requires it, make sure to account for it.  We
8301                          * don't apply the size until the AUTH chunk is
8302                          * actually added below in case there is no room for
8303                          * this chunk. NOTE: we overload the use of "omtu"
8304                          * here
8305                          */
8306                         if ((auth == NULL) &&
8307                             sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
8308                             stcb->asoc.peer_auth_chunks)) {
8309                                 omtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
8310                         } else
8311                                 omtu = 0;
8312                         /* Here we do NOT factor the r_mtu */
8313                         if ((chk->send_size <= (int)(mtu - omtu)) ||
8314                             (chk->flags & CHUNK_FLAGS_FRAGMENT_OK)) {
8315                                 /*
8316                                  * We probably should glom the mbuf chain
8317                                  * from the chk->data for control but the
8318                                  * problem is it becomes yet one more level
8319                                  * of tracking to do if for some reason
8320                                  * output fails. Then I have got to
8321                                  * reconstruct the merged control chain.. el
8322                                  * yucko.. for now we take the easy way and
8323                                  * do the copy
8324                                  */
8325                                 /*
8326                                  * Add an AUTH chunk, if chunk requires it
8327                                  * save the offset into the chain for AUTH
8328                                  */
8329                                 if ((auth == NULL) &&
8330                                     (sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
8331                                     stcb->asoc.peer_auth_chunks))) {
8332                                         outchain = sctp_add_auth_chunk(outchain,
8333                                             &endoutchain,
8334                                             &auth,
8335                                             &auth_offset,
8336                                             stcb,
8337                                             chk->rec.chunk_id.id);
8338                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8339                                 }
8340                                 outchain = sctp_copy_mbufchain(chk->data, outchain, &endoutchain,
8341                                     (int)chk->rec.chunk_id.can_take_data,
8342                                     chk->send_size, chk->copy_by_ref);
8343                                 if (outchain == NULL) {
8344                                         *reason_code = 8;
8345                                         SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
8346                                         return (ENOMEM);
8347                                 }
8348                                 SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8349                                 /* update our MTU size */
8350                                 if (mtu > (chk->send_size + omtu))
8351                                         mtu -= (chk->send_size + omtu);
8352                                 else
8353                                         mtu = 0;
8354                                 to_out += (chk->send_size + omtu);
8355                                 /* Do clear IP_DF ? */
8356                                 if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
8357                                         no_fragmentflg = 0;
8358                                 }
8359                                 if (chk->rec.chunk_id.can_take_data)
8360                                         chk->data = NULL;
8361                                 /* Mark things to be removed, if needed */
8362                                 if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
8363                                     (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK) ||  /* EY */
8364                                     (chk->rec.chunk_id.id == SCTP_HEARTBEAT_REQUEST) ||
8365                                     (chk->rec.chunk_id.id == SCTP_HEARTBEAT_ACK) ||
8366                                     (chk->rec.chunk_id.id == SCTP_SHUTDOWN) ||
8367                                     (chk->rec.chunk_id.id == SCTP_SHUTDOWN_ACK) ||
8368                                     (chk->rec.chunk_id.id == SCTP_OPERATION_ERROR) ||
8369                                     (chk->rec.chunk_id.id == SCTP_COOKIE_ACK) ||
8370                                     (chk->rec.chunk_id.id == SCTP_ECN_CWR) ||
8371                                     (chk->rec.chunk_id.id == SCTP_PACKET_DROPPED) ||
8372                                     (chk->rec.chunk_id.id == SCTP_ASCONF_ACK)) {
8373                                         if (chk->rec.chunk_id.id == SCTP_HEARTBEAT_REQUEST) {
8374                                                 hbflag = 1;
8375                                         }
8376                                         /* remove these chunks at the end */
8377                                         if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
8378                                             (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK)) {
8379                                                 /* turn off the timer */
8380                                                 if (SCTP_OS_TIMER_PENDING(&stcb->asoc.dack_timer.timer)) {
8381                                                         sctp_timer_stop(SCTP_TIMER_TYPE_RECV,
8382                                                             inp, stcb, NULL,
8383                                                             SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_1);
8384                                                 }
8385                                         }
8386                                         ctl_cnt++;
8387                                 } else {
8388                                         /*
8389                                          * Other chunks, since they have
8390                                          * timers running (i.e. COOKIE) we
8391                                          * just "trust" that it gets sent or
8392                                          * retransmitted.
8393                                          */
8394                                         ctl_cnt++;
8395                                         if (chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
8396                                                 cookie = 1;
8397                                                 no_out_cnt = 1;
8398                                         } else if (chk->rec.chunk_id.id == SCTP_ECN_ECHO) {
8399                                                 /*
8400                                                  * Increment ecne send count
8401                                                  * here this means we may be
8402                                                  * over-zealous in our
8403                                                  * counting if the send
8404                                                  * fails, but its the best
8405                                                  * place to do it (we used
8406                                                  * to do it in the queue of
8407                                                  * the chunk, but that did
8408                                                  * not tell how many times
8409                                                  * it was sent.
8410                                                  */
8411                                                 SCTP_STAT_INCR(sctps_sendecne);
8412                                         }
8413                                         chk->sent = SCTP_DATAGRAM_SENT;
8414                                         if (chk->whoTo == NULL) {
8415                                                 chk->whoTo = net;
8416                                                 atomic_add_int(&net->ref_count, 1);
8417                                         }
8418                                         chk->snd_count++;
8419                                 }
8420                                 if (mtu == 0) {
8421                                         /*
8422                                          * Ok we are out of room but we can
8423                                          * output without effecting the
8424                                          * flight size since this little guy
8425                                          * is a control only packet.
8426                                          */
8427                                         if (asconf) {
8428                                                 sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp, stcb, net);
8429                                                 /*
8430                                                  * do NOT clear the asconf
8431                                                  * flag as it is used to do
8432                                                  * appropriate source
8433                                                  * address selection.
8434                                                  */
8435                                         }
8436                                         if (cookie) {
8437                                                 sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, inp, stcb, net);
8438                                                 cookie = 0;
8439                                         }
8440                                         /* Only HB or ASCONF advances time */
8441                                         if (hbflag) {
8442                                                 if (*now_filled == 0) {
8443                                                         (void)SCTP_GETTIME_TIMEVAL(now);
8444                                                         *now_filled = 1;
8445                                                 }
8446                                                 net->last_sent_time = *now;
8447                                                 hbflag = 0;
8448                                         }
8449                                         if ((error = sctp_lowlevel_chunk_output(inp, stcb, net,
8450                                             (struct sockaddr *)&net->ro._l_addr,
8451                                             outchain,
8452                                             auth_offset, auth,
8453                                             stcb->asoc.authinfo.active_keyid,
8454                                             no_fragmentflg, 0, asconf,
8455                                             inp->sctp_lport, stcb->rport,
8456                                             htonl(stcb->asoc.peer_vtag),
8457                                             net->port, NULL,
8458                                             0, 0,
8459                                             so_locked))) {
8460                                                 /*
8461                                                  * error, we could not
8462                                                  * output
8463                                                  */
8464                                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
8465                                                 if (from_where == 0) {
8466                                                         SCTP_STAT_INCR(sctps_lowlevelerrusr);
8467                                                 }
8468                                                 if (error == ENOBUFS) {
8469                                                         asoc->ifp_had_enobuf = 1;
8470                                                         SCTP_STAT_INCR(sctps_lowlevelerr);
8471                                                 }
8472                                                 if (error == EHOSTUNREACH) {
8473                                                         /*
8474                                                          * Destination went
8475                                                          * unreachable
8476                                                          * during this send
8477                                                          */
8478                                                         sctp_move_chunks_from_net(stcb, net);
8479                                                 }
8480                                                 *reason_code = 7;
8481                                                 break;
8482                                         } else {
8483                                                 asoc->ifp_had_enobuf = 0;
8484                                         }
8485                                         /*
8486                                          * increase the number we sent, if a
8487                                          * cookie is sent we don't tell them
8488                                          * any was sent out.
8489                                          */
8490                                         outchain = endoutchain = NULL;
8491                                         auth = NULL;
8492                                         auth_offset = 0;
8493                                         if (!no_out_cnt)
8494                                                 *num_out += ctl_cnt;
8495                                         /* recalc a clean slate and setup */
8496                                         switch (net->ro._l_addr.sa.sa_family) {
8497 #ifdef INET
8498                                         case AF_INET:
8499                                                 mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
8500                                                 break;
8501 #endif
8502 #ifdef INET6
8503                                         case AF_INET6:
8504                                                 mtu = net->mtu - SCTP_MIN_OVERHEAD;
8505                                                 break;
8506 #endif
8507                                         default:
8508                                                 /* TSNH */
8509                                                 mtu = net->mtu;
8510                                                 break;
8511                                         }
8512                                         to_out = 0;
8513                                         no_fragmentflg = 1;
8514                                 }
8515                         }
8516                 }
8517                 if (error != 0) {
8518                         /* try next net */
8519                         continue;
8520                 }
8521                 /* JRI: if dest is in PF state, do not send data to it */
8522                 if ((asoc->sctp_cmt_on_off > 0) &&
8523                     (net != stcb->asoc.alternate) &&
8524                     (net->dest_state & SCTP_ADDR_PF)) {
8525                         goto no_data_fill;
8526                 }
8527                 if (net->flight_size >= net->cwnd) {
8528                         goto no_data_fill;
8529                 }
8530                 if ((asoc->sctp_cmt_on_off > 0) &&
8531                     (SCTP_BASE_SYSCTL(sctp_buffer_splitting) & SCTP_RECV_BUFFER_SPLITTING) &&
8532                     (net->flight_size > max_rwnd_per_dest)) {
8533                         goto no_data_fill;
8534                 }
8535                 /*
8536                  * We need a specific accounting for the usage of the send
8537                  * buffer. We also need to check the number of messages per
8538                  * net. For now, this is better than nothing and it disabled
8539                  * by default...
8540                  */
8541                 if ((asoc->sctp_cmt_on_off > 0) &&
8542                     (SCTP_BASE_SYSCTL(sctp_buffer_splitting) & SCTP_SEND_BUFFER_SPLITTING) &&
8543                     (max_send_per_dest > 0) &&
8544                     (net->flight_size > max_send_per_dest)) {
8545                         goto no_data_fill;
8546                 }
8547                 /*********************/
8548                 /* Data transmission */
8549                 /*********************/
8550                 /*
8551                  * if AUTH for DATA is required and no AUTH has been added
8552                  * yet, account for this in the mtu now... if no data can be
8553                  * bundled, this adjustment won't matter anyways since the
8554                  * packet will be going out...
8555                  */
8556                 data_auth_reqd = sctp_auth_is_required_chunk(SCTP_DATA,
8557                     stcb->asoc.peer_auth_chunks);
8558                 if (data_auth_reqd && (auth == NULL)) {
8559                         mtu -= sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
8560                 }
8561                 /* now lets add any data within the MTU constraints */
8562                 switch (((struct sockaddr *)&net->ro._l_addr)->sa_family) {
8563 #ifdef INET
8564                 case AF_INET:
8565                         if (net->mtu > SCTP_MIN_V4_OVERHEAD)
8566                                 omtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
8567                         else
8568                                 omtu = 0;
8569                         break;
8570 #endif
8571 #ifdef INET6
8572                 case AF_INET6:
8573                         if (net->mtu > SCTP_MIN_OVERHEAD)
8574                                 omtu = net->mtu - SCTP_MIN_OVERHEAD;
8575                         else
8576                                 omtu = 0;
8577                         break;
8578 #endif
8579                 default:
8580                         /* TSNH */
8581                         omtu = 0;
8582                         break;
8583                 }
8584                 if ((((SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) ||
8585                     (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_RECEIVED)) &&
8586                     (skip_data_for_this_net == 0)) ||
8587                     (cookie)) {
8588                         TAILQ_FOREACH_SAFE(chk, &asoc->send_queue, sctp_next, nchk) {
8589                                 if (no_data_chunks) {
8590                                         /* let only control go out */
8591                                         *reason_code = 1;
8592                                         break;
8593                                 }
8594                                 if (net->flight_size >= net->cwnd) {
8595                                         /* skip this net, no room for data */
8596                                         *reason_code = 2;
8597                                         break;
8598                                 }
8599                                 if ((chk->whoTo != NULL) &&
8600                                     (chk->whoTo != net)) {
8601                                         /* Don't send the chunk on this net */
8602                                         continue;
8603                                 }
8604
8605                                 if (asoc->sctp_cmt_on_off == 0) {
8606                                         if ((asoc->alternate) &&
8607                                             (asoc->alternate != net) &&
8608                                             (chk->whoTo == NULL)) {
8609                                                 continue;
8610                                         } else if ((net != asoc->primary_destination) &&
8611                                                     (asoc->alternate == NULL) &&
8612                                             (chk->whoTo == NULL)) {
8613                                                 continue;
8614                                         }
8615                                 }
8616                                 if ((chk->send_size > omtu) && ((chk->flags & CHUNK_FLAGS_FRAGMENT_OK) == 0)) {
8617                                         /*-
8618                                          * strange, we have a chunk that is
8619                                          * to big for its destination and
8620                                          * yet no fragment ok flag.
8621                                          * Something went wrong when the
8622                                          * PMTU changed...we did not mark
8623                                          * this chunk for some reason?? I
8624                                          * will fix it here by letting IP
8625                                          * fragment it for now and printing
8626                                          * a warning. This really should not
8627                                          * happen ...
8628                                          */
8629                                         SCTP_PRINTF("Warning chunk of %d bytes > mtu:%d and yet PMTU disc missed\n",
8630                                             chk->send_size, mtu);
8631                                         chk->flags |= CHUNK_FLAGS_FRAGMENT_OK;
8632                                 }
8633                                 if (SCTP_BASE_SYSCTL(sctp_enable_sack_immediately) &&
8634                                     (asoc->state & SCTP_STATE_SHUTDOWN_PENDING)) {
8635                                         struct sctp_data_chunk *dchkh;
8636
8637                                         dchkh = mtod(chk->data, struct sctp_data_chunk *);
8638                                         dchkh->ch.chunk_flags |= SCTP_DATA_SACK_IMMEDIATELY;
8639                                 }
8640                                 if (((chk->send_size <= mtu) && (chk->send_size <= r_mtu)) ||
8641                                     ((chk->flags & CHUNK_FLAGS_FRAGMENT_OK) && (chk->send_size <= asoc->peers_rwnd))) {
8642                                         /* ok we will add this one */
8643
8644                                         /*
8645                                          * Add an AUTH chunk, if chunk
8646                                          * requires it, save the offset into
8647                                          * the chain for AUTH
8648                                          */
8649                                         if (data_auth_reqd) {
8650                                                 if (auth == NULL) {
8651                                                         outchain = sctp_add_auth_chunk(outchain,
8652                                                             &endoutchain,
8653                                                             &auth,
8654                                                             &auth_offset,
8655                                                             stcb,
8656                                                             SCTP_DATA);
8657                                                         auth_keyid = chk->auth_keyid;
8658                                                         override_ok = 0;
8659                                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8660                                                 } else if (override_ok) {
8661                                                         /*
8662                                                          * use this data's
8663                                                          * keyid
8664                                                          */
8665                                                         auth_keyid = chk->auth_keyid;
8666                                                         override_ok = 0;
8667                                                 } else if (auth_keyid != chk->auth_keyid) {
8668                                                         /*
8669                                                          * different keyid,
8670                                                          * so done bundling
8671                                                          */
8672                                                         break;
8673                                                 }
8674                                         }
8675                                         outchain = sctp_copy_mbufchain(chk->data, outchain, &endoutchain, 0,
8676                                             chk->send_size, chk->copy_by_ref);
8677                                         if (outchain == NULL) {
8678                                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "No memory?\n");
8679                                                 if (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
8680                                                         sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
8681                                                 }
8682                                                 *reason_code = 3;
8683                                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
8684                                                 return (ENOMEM);
8685                                         }
8686                                         /* upate our MTU size */
8687                                         /* Do clear IP_DF ? */
8688                                         if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
8689                                                 no_fragmentflg = 0;
8690                                         }
8691                                         /* unsigned subtraction of mtu */
8692                                         if (mtu > chk->send_size)
8693                                                 mtu -= chk->send_size;
8694                                         else
8695                                                 mtu = 0;
8696                                         /* unsigned subtraction of r_mtu */
8697                                         if (r_mtu > chk->send_size)
8698                                                 r_mtu -= chk->send_size;
8699                                         else
8700                                                 r_mtu = 0;
8701
8702                                         to_out += chk->send_size;
8703                                         if ((to_out > mx_mtu) && no_fragmentflg) {
8704 #ifdef INVARIANTS
8705                                                 panic("Exceeding mtu of %d out size is %d", mx_mtu, to_out);
8706 #else
8707                                                 SCTP_PRINTF("Exceeding mtu of %d out size is %d\n",
8708                                                     mx_mtu, to_out);
8709 #endif
8710                                         }
8711                                         chk->window_probe = 0;
8712                                         data_list[bundle_at++] = chk;
8713                                         if (bundle_at >= SCTP_MAX_DATA_BUNDLING) {
8714                                                 break;
8715                                         }
8716                                         if (chk->sent == SCTP_DATAGRAM_UNSENT) {
8717                                                 if ((chk->rec.data.rcv_flags & SCTP_DATA_UNORDERED) == 0) {
8718                                                         SCTP_STAT_INCR_COUNTER64(sctps_outorderchunks);
8719                                                 } else {
8720                                                         SCTP_STAT_INCR_COUNTER64(sctps_outunorderchunks);
8721                                                 }
8722                                                 if (((chk->rec.data.rcv_flags & SCTP_DATA_LAST_FRAG) == SCTP_DATA_LAST_FRAG) &&
8723                                                     ((chk->rec.data.rcv_flags & SCTP_DATA_FIRST_FRAG) == 0))
8724                                                         /*
8725                                                          * Count number of
8726                                                          * user msg's that
8727                                                          * were fragmented
8728                                                          * we do this by
8729                                                          * counting when we
8730                                                          * see a LAST
8731                                                          * fragment only.
8732                                                          */
8733                                                         SCTP_STAT_INCR_COUNTER64(sctps_fragusrmsgs);
8734                                         }
8735                                         if ((mtu == 0) || (r_mtu == 0) || (one_chunk)) {
8736                                                 if ((one_chunk) && (stcb->asoc.total_flight == 0)) {
8737                                                         data_list[0]->window_probe = 1;
8738                                                         net->window_probe = 1;
8739                                                 }
8740                                                 break;
8741                                         }
8742                                 } else {
8743                                         /*
8744                                          * Must be sent in order of the
8745                                          * TSN's (on a network)
8746                                          */
8747                                         break;
8748                                 }
8749                         }       /* for (chunk gather loop for this net) */
8750                 }               /* if asoc.state OPEN */
8751 no_data_fill:
8752                 /* Is there something to send for this destination? */
8753                 if (outchain) {
8754                         /* We may need to start a control timer or two */
8755                         if (asconf) {
8756                                 sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp,
8757                                     stcb, net);
8758                                 /*
8759                                  * do NOT clear the asconf flag as it is
8760                                  * used to do appropriate source address
8761                                  * selection.
8762                                  */
8763                         }
8764                         if (cookie) {
8765                                 sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, inp, stcb, net);
8766                                 cookie = 0;
8767                         }
8768                         /* must start a send timer if data is being sent */
8769                         if (bundle_at && (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer))) {
8770                                 /*
8771                                  * no timer running on this destination
8772                                  * restart it.
8773                                  */
8774                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
8775                         }
8776                         if (bundle_at || hbflag) {
8777                                 /* For data/asconf and hb set time */
8778                                 if (*now_filled == 0) {
8779                                         (void)SCTP_GETTIME_TIMEVAL(now);
8780                                         *now_filled = 1;
8781                                 }
8782                                 net->last_sent_time = *now;
8783                         }
8784                         /* Now send it, if there is anything to send :> */
8785                         if ((error = sctp_lowlevel_chunk_output(inp,
8786                             stcb,
8787                             net,
8788                             (struct sockaddr *)&net->ro._l_addr,
8789                             outchain,
8790                             auth_offset,
8791                             auth,
8792                             auth_keyid,
8793                             no_fragmentflg,
8794                             bundle_at,
8795                             asconf,
8796                             inp->sctp_lport, stcb->rport,
8797                             htonl(stcb->asoc.peer_vtag),
8798                             net->port, NULL,
8799                             0, 0,
8800                             so_locked))) {
8801                                 /* error, we could not output */
8802                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
8803                                 if (from_where == 0) {
8804                                         SCTP_STAT_INCR(sctps_lowlevelerrusr);
8805                                 }
8806                                 if (error == ENOBUFS) {
8807                                         asoc->ifp_had_enobuf = 1;
8808                                         SCTP_STAT_INCR(sctps_lowlevelerr);
8809                                 }
8810                                 if (error == EHOSTUNREACH) {
8811                                         /*
8812                                          * Destination went unreachable
8813                                          * during this send
8814                                          */
8815                                         sctp_move_chunks_from_net(stcb, net);
8816                                 }
8817                                 *reason_code = 6;
8818                                 /*-
8819                                  * I add this line to be paranoid. As far as
8820                                  * I can tell the continue, takes us back to
8821                                  * the top of the for, but just to make sure
8822                                  * I will reset these again here.
8823                                  */
8824                                 ctl_cnt = 0;
8825                                 continue;       /* This takes us back to the
8826                                                  * for() for the nets. */
8827                         } else {
8828                                 asoc->ifp_had_enobuf = 0;
8829                         }
8830                         endoutchain = NULL;
8831                         auth = NULL;
8832                         auth_offset = 0;
8833                         if (!no_out_cnt) {
8834                                 *num_out += (ctl_cnt + bundle_at);
8835                         }
8836                         if (bundle_at) {
8837                                 /* setup for a RTO measurement */
8838                                 tsns_sent = data_list[0]->rec.data.tsn;
8839                                 /* fill time if not already filled */
8840                                 if (*now_filled == 0) {
8841                                         (void)SCTP_GETTIME_TIMEVAL(&asoc->time_last_sent);
8842                                         *now_filled = 1;
8843                                         *now = asoc->time_last_sent;
8844                                 } else {
8845                                         asoc->time_last_sent = *now;
8846                                 }
8847                                 if (net->rto_needed) {
8848                                         data_list[0]->do_rtt = 1;
8849                                         net->rto_needed = 0;
8850                                 }
8851                                 SCTP_STAT_INCR_BY(sctps_senddata, bundle_at);
8852                                 sctp_clean_up_datalist(stcb, asoc, data_list, bundle_at, net);
8853                         }
8854                         if (one_chunk) {
8855                                 break;
8856                         }
8857                 }
8858                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
8859                         sctp_log_cwnd(stcb, net, tsns_sent, SCTP_CWND_LOG_FROM_SEND);
8860                 }
8861         }
8862         if (old_start_at == NULL) {
8863                 old_start_at = start_at;
8864                 start_at = TAILQ_FIRST(&asoc->nets);
8865                 if (old_start_at)
8866                         goto again_one_more_time;
8867         }
8868
8869         /*
8870          * At the end there should be no NON timed chunks hanging on this
8871          * queue.
8872          */
8873         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
8874                 sctp_log_cwnd(stcb, net, *num_out, SCTP_CWND_LOG_FROM_SEND);
8875         }
8876         if ((*num_out == 0) && (*reason_code == 0)) {
8877                 *reason_code = 4;
8878         } else {
8879                 *reason_code = 5;
8880         }
8881         sctp_clean_up_ctl(stcb, asoc, so_locked);
8882         return (0);
8883 }
8884
8885 void
8886 sctp_queue_op_err(struct sctp_tcb *stcb, struct mbuf *op_err)
8887 {
8888         /*-
8889          * Prepend a OPERATIONAL_ERROR chunk header and put on the end of
8890          * the control chunk queue.
8891          */
8892         struct sctp_chunkhdr *hdr;
8893         struct sctp_tmit_chunk *chk;
8894         struct mbuf *mat, *last_mbuf;
8895         uint32_t chunk_length;
8896         uint16_t padding_length;
8897
8898         SCTP_TCB_LOCK_ASSERT(stcb);
8899         SCTP_BUF_PREPEND(op_err, sizeof(struct sctp_chunkhdr), M_NOWAIT);
8900         if (op_err == NULL) {
8901                 return;
8902         }
8903         last_mbuf = NULL;
8904         chunk_length = 0;
8905         for (mat = op_err; mat != NULL; mat = SCTP_BUF_NEXT(mat)) {
8906                 chunk_length += SCTP_BUF_LEN(mat);
8907                 if (SCTP_BUF_NEXT(mat) == NULL) {
8908                         last_mbuf = mat;
8909                 }
8910         }
8911         if (chunk_length > SCTP_MAX_CHUNK_LENGTH) {
8912                 sctp_m_freem(op_err);
8913                 return;
8914         }
8915         padding_length = chunk_length % 4;
8916         if (padding_length != 0) {
8917                 padding_length = 4 - padding_length;
8918         }
8919         if (padding_length != 0) {
8920                 if (sctp_add_pad_tombuf(last_mbuf, padding_length) == NULL) {
8921                         sctp_m_freem(op_err);
8922                         return;
8923                 }
8924         }
8925         sctp_alloc_a_chunk(stcb, chk);
8926         if (chk == NULL) {
8927                 /* no memory */
8928                 sctp_m_freem(op_err);
8929                 return;
8930         }
8931         chk->copy_by_ref = 0;
8932         chk->rec.chunk_id.id = SCTP_OPERATION_ERROR;
8933         chk->rec.chunk_id.can_take_data = 0;
8934         chk->flags = 0;
8935         chk->send_size = (uint16_t)chunk_length;
8936         chk->sent = SCTP_DATAGRAM_UNSENT;
8937         chk->snd_count = 0;
8938         chk->asoc = &stcb->asoc;
8939         chk->data = op_err;
8940         chk->whoTo = NULL;
8941         hdr = mtod(op_err, struct sctp_chunkhdr *);
8942         hdr->chunk_type = SCTP_OPERATION_ERROR;
8943         hdr->chunk_flags = 0;
8944         hdr->chunk_length = htons(chk->send_size);
8945         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
8946         chk->asoc->ctrl_queue_cnt++;
8947 }
8948
8949 int
8950 sctp_send_cookie_echo(struct mbuf *m,
8951     int offset, int limit,
8952     struct sctp_tcb *stcb,
8953     struct sctp_nets *net)
8954 {
8955         /*-
8956          * pull out the cookie and put it at the front of the control chunk
8957          * queue.
8958          */
8959         int at;
8960         struct mbuf *cookie;
8961         struct sctp_paramhdr param, *phdr;
8962         struct sctp_chunkhdr *hdr;
8963         struct sctp_tmit_chunk *chk;
8964         uint16_t ptype, plen;
8965
8966         SCTP_TCB_LOCK_ASSERT(stcb);
8967         /* First find the cookie in the param area */
8968         cookie = NULL;
8969         at = offset + sizeof(struct sctp_init_chunk);
8970         for (;;) {
8971                 phdr = sctp_get_next_param(m, at, &param, sizeof(param));
8972                 if (phdr == NULL) {
8973                         return (-3);
8974                 }
8975                 ptype = ntohs(phdr->param_type);
8976                 plen = ntohs(phdr->param_length);
8977                 if (plen < sizeof(struct sctp_paramhdr)) {
8978                         return (-6);
8979                 }
8980                 if (ptype == SCTP_STATE_COOKIE) {
8981                         int pad;
8982
8983                         /* found the cookie */
8984                         if (at + plen > limit) {
8985                                 return (-7);
8986                         }
8987                         cookie = SCTP_M_COPYM(m, at, plen, M_NOWAIT);
8988                         if (cookie == NULL) {
8989                                 /* No memory */
8990                                 return (-2);
8991                         }
8992                         if ((pad = (plen % 4)) > 0) {
8993                                 pad = 4 - pad;
8994                         }
8995                         if (pad > 0) {
8996                                 if (sctp_pad_lastmbuf(cookie, pad, NULL) == NULL) {
8997                                         return (-8);
8998                                 }
8999                         }
9000 #ifdef SCTP_MBUF_LOGGING
9001                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
9002                                 sctp_log_mbc(cookie, SCTP_MBUF_ICOPY);
9003                         }
9004 #endif
9005                         break;
9006                 }
9007                 at += SCTP_SIZE32(plen);
9008         }
9009         /* ok, we got the cookie lets change it into a cookie echo chunk */
9010         /* first the change from param to cookie */
9011         hdr = mtod(cookie, struct sctp_chunkhdr *);
9012         hdr->chunk_type = SCTP_COOKIE_ECHO;
9013         hdr->chunk_flags = 0;
9014         /* get the chunk stuff now and place it in the FRONT of the queue */
9015         sctp_alloc_a_chunk(stcb, chk);
9016         if (chk == NULL) {
9017                 /* no memory */
9018                 sctp_m_freem(cookie);
9019                 return (-5);
9020         }
9021         chk->copy_by_ref = 0;
9022         chk->rec.chunk_id.id = SCTP_COOKIE_ECHO;
9023         chk->rec.chunk_id.can_take_data = 0;
9024         chk->flags = CHUNK_FLAGS_FRAGMENT_OK;
9025         chk->send_size = SCTP_SIZE32(plen);
9026         chk->sent = SCTP_DATAGRAM_UNSENT;
9027         chk->snd_count = 0;
9028         chk->asoc = &stcb->asoc;
9029         chk->data = cookie;
9030         chk->whoTo = net;
9031         atomic_add_int(&chk->whoTo->ref_count, 1);
9032         TAILQ_INSERT_HEAD(&chk->asoc->control_send_queue, chk, sctp_next);
9033         chk->asoc->ctrl_queue_cnt++;
9034         return (0);
9035 }
9036
9037 void
9038 sctp_send_heartbeat_ack(struct sctp_tcb *stcb,
9039     struct mbuf *m,
9040     int offset,
9041     int chk_length,
9042     struct sctp_nets *net)
9043 {
9044         /*
9045          * take a HB request and make it into a HB ack and send it.
9046          */
9047         struct mbuf *outchain;
9048         struct sctp_chunkhdr *chdr;
9049         struct sctp_tmit_chunk *chk;
9050
9051         if (net == NULL)
9052                 /* must have a net pointer */
9053                 return;
9054
9055         outchain = SCTP_M_COPYM(m, offset, chk_length, M_NOWAIT);
9056         if (outchain == NULL) {
9057                 /* gak out of memory */
9058                 return;
9059         }
9060 #ifdef SCTP_MBUF_LOGGING
9061         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
9062                 sctp_log_mbc(outchain, SCTP_MBUF_ICOPY);
9063         }
9064 #endif
9065         chdr = mtod(outchain, struct sctp_chunkhdr *);
9066         chdr->chunk_type = SCTP_HEARTBEAT_ACK;
9067         chdr->chunk_flags = 0;
9068         if (chk_length % 4 != 0) {
9069                 sctp_pad_lastmbuf(outchain, 4 - (chk_length % 4), NULL);
9070         }
9071         sctp_alloc_a_chunk(stcb, chk);
9072         if (chk == NULL) {
9073                 /* no memory */
9074                 sctp_m_freem(outchain);
9075                 return;
9076         }
9077         chk->copy_by_ref = 0;
9078         chk->rec.chunk_id.id = SCTP_HEARTBEAT_ACK;
9079         chk->rec.chunk_id.can_take_data = 1;
9080         chk->flags = 0;
9081         chk->send_size = chk_length;
9082         chk->sent = SCTP_DATAGRAM_UNSENT;
9083         chk->snd_count = 0;
9084         chk->asoc = &stcb->asoc;
9085         chk->data = outchain;
9086         chk->whoTo = net;
9087         atomic_add_int(&chk->whoTo->ref_count, 1);
9088         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9089         chk->asoc->ctrl_queue_cnt++;
9090 }
9091
9092 void
9093 sctp_send_cookie_ack(struct sctp_tcb *stcb)
9094 {
9095         /* formulate and queue a cookie-ack back to sender */
9096         struct mbuf *cookie_ack;
9097         struct sctp_chunkhdr *hdr;
9098         struct sctp_tmit_chunk *chk;
9099
9100         SCTP_TCB_LOCK_ASSERT(stcb);
9101
9102         cookie_ack = sctp_get_mbuf_for_msg(sizeof(struct sctp_chunkhdr), 0, M_NOWAIT, 1, MT_HEADER);
9103         if (cookie_ack == NULL) {
9104                 /* no mbuf's */
9105                 return;
9106         }
9107         SCTP_BUF_RESV_UF(cookie_ack, SCTP_MIN_OVERHEAD);
9108         sctp_alloc_a_chunk(stcb, chk);
9109         if (chk == NULL) {
9110                 /* no memory */
9111                 sctp_m_freem(cookie_ack);
9112                 return;
9113         }
9114         chk->copy_by_ref = 0;
9115         chk->rec.chunk_id.id = SCTP_COOKIE_ACK;
9116         chk->rec.chunk_id.can_take_data = 1;
9117         chk->flags = 0;
9118         chk->send_size = sizeof(struct sctp_chunkhdr);
9119         chk->sent = SCTP_DATAGRAM_UNSENT;
9120         chk->snd_count = 0;
9121         chk->asoc = &stcb->asoc;
9122         chk->data = cookie_ack;
9123         if (chk->asoc->last_control_chunk_from != NULL) {
9124                 chk->whoTo = chk->asoc->last_control_chunk_from;
9125                 atomic_add_int(&chk->whoTo->ref_count, 1);
9126         } else {
9127                 chk->whoTo = NULL;
9128         }
9129         hdr = mtod(cookie_ack, struct sctp_chunkhdr *);
9130         hdr->chunk_type = SCTP_COOKIE_ACK;
9131         hdr->chunk_flags = 0;
9132         hdr->chunk_length = htons(chk->send_size);
9133         SCTP_BUF_LEN(cookie_ack) = chk->send_size;
9134         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9135         chk->asoc->ctrl_queue_cnt++;
9136         return;
9137 }
9138
9139
9140 void
9141 sctp_send_shutdown_ack(struct sctp_tcb *stcb, struct sctp_nets *net)
9142 {
9143         /* formulate and queue a SHUTDOWN-ACK back to the sender */
9144         struct mbuf *m_shutdown_ack;
9145         struct sctp_shutdown_ack_chunk *ack_cp;
9146         struct sctp_tmit_chunk *chk;
9147
9148         m_shutdown_ack = sctp_get_mbuf_for_msg(sizeof(struct sctp_shutdown_ack_chunk), 0, M_NOWAIT, 1, MT_HEADER);
9149         if (m_shutdown_ack == NULL) {
9150                 /* no mbuf's */
9151                 return;
9152         }
9153         SCTP_BUF_RESV_UF(m_shutdown_ack, SCTP_MIN_OVERHEAD);
9154         sctp_alloc_a_chunk(stcb, chk);
9155         if (chk == NULL) {
9156                 /* no memory */
9157                 sctp_m_freem(m_shutdown_ack);
9158                 return;
9159         }
9160         chk->copy_by_ref = 0;
9161         chk->rec.chunk_id.id = SCTP_SHUTDOWN_ACK;
9162         chk->rec.chunk_id.can_take_data = 1;
9163         chk->flags = 0;
9164         chk->send_size = sizeof(struct sctp_chunkhdr);
9165         chk->sent = SCTP_DATAGRAM_UNSENT;
9166         chk->snd_count = 0;
9167         chk->asoc = &stcb->asoc;
9168         chk->data = m_shutdown_ack;
9169         chk->whoTo = net;
9170         if (chk->whoTo) {
9171                 atomic_add_int(&chk->whoTo->ref_count, 1);
9172         }
9173         ack_cp = mtod(m_shutdown_ack, struct sctp_shutdown_ack_chunk *);
9174         ack_cp->ch.chunk_type = SCTP_SHUTDOWN_ACK;
9175         ack_cp->ch.chunk_flags = 0;
9176         ack_cp->ch.chunk_length = htons(chk->send_size);
9177         SCTP_BUF_LEN(m_shutdown_ack) = chk->send_size;
9178         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9179         chk->asoc->ctrl_queue_cnt++;
9180         return;
9181 }
9182
9183 void
9184 sctp_send_shutdown(struct sctp_tcb *stcb, struct sctp_nets *net)
9185 {
9186         /* formulate and queue a SHUTDOWN to the sender */
9187         struct mbuf *m_shutdown;
9188         struct sctp_shutdown_chunk *shutdown_cp;
9189         struct sctp_tmit_chunk *chk;
9190
9191         TAILQ_FOREACH(chk, &stcb->asoc.control_send_queue, sctp_next) {
9192                 if (chk->rec.chunk_id.id == SCTP_SHUTDOWN) {
9193                         /* We already have a SHUTDOWN queued. Reuse it. */
9194                         if (chk->whoTo) {
9195                                 sctp_free_remote_addr(chk->whoTo);
9196                                 chk->whoTo = NULL;
9197                         }
9198                         break;
9199                 }
9200         }
9201         if (chk == NULL) {
9202                 m_shutdown = sctp_get_mbuf_for_msg(sizeof(struct sctp_shutdown_chunk), 0, M_NOWAIT, 1, MT_HEADER);
9203                 if (m_shutdown == NULL) {
9204                         /* no mbuf's */
9205                         return;
9206                 }
9207                 SCTP_BUF_RESV_UF(m_shutdown, SCTP_MIN_OVERHEAD);
9208                 sctp_alloc_a_chunk(stcb, chk);
9209                 if (chk == NULL) {
9210                         /* no memory */
9211                         sctp_m_freem(m_shutdown);
9212                         return;
9213                 }
9214                 chk->copy_by_ref = 0;
9215                 chk->rec.chunk_id.id = SCTP_SHUTDOWN;
9216                 chk->rec.chunk_id.can_take_data = 1;
9217                 chk->flags = 0;
9218                 chk->send_size = sizeof(struct sctp_shutdown_chunk);
9219                 chk->sent = SCTP_DATAGRAM_UNSENT;
9220                 chk->snd_count = 0;
9221                 chk->asoc = &stcb->asoc;
9222                 chk->data = m_shutdown;
9223                 chk->whoTo = net;
9224                 if (chk->whoTo) {
9225                         atomic_add_int(&chk->whoTo->ref_count, 1);
9226                 }
9227                 shutdown_cp = mtod(m_shutdown, struct sctp_shutdown_chunk *);
9228                 shutdown_cp->ch.chunk_type = SCTP_SHUTDOWN;
9229                 shutdown_cp->ch.chunk_flags = 0;
9230                 shutdown_cp->ch.chunk_length = htons(chk->send_size);
9231                 shutdown_cp->cumulative_tsn_ack = htonl(stcb->asoc.cumulative_tsn);
9232                 SCTP_BUF_LEN(m_shutdown) = chk->send_size;
9233                 TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9234                 chk->asoc->ctrl_queue_cnt++;
9235         } else {
9236                 TAILQ_REMOVE(&stcb->asoc.control_send_queue, chk, sctp_next);
9237                 chk->whoTo = net;
9238                 if (chk->whoTo) {
9239                         atomic_add_int(&chk->whoTo->ref_count, 1);
9240                 }
9241                 shutdown_cp = mtod(chk->data, struct sctp_shutdown_chunk *);
9242                 shutdown_cp->cumulative_tsn_ack = htonl(stcb->asoc.cumulative_tsn);
9243                 TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
9244         }
9245         return;
9246 }
9247
9248 void
9249 sctp_send_asconf(struct sctp_tcb *stcb, struct sctp_nets *net, int addr_locked)
9250 {
9251         /*
9252          * formulate and queue an ASCONF to the peer. ASCONF parameters
9253          * should be queued on the assoc queue.
9254          */
9255         struct sctp_tmit_chunk *chk;
9256         struct mbuf *m_asconf;
9257         int len;
9258
9259         SCTP_TCB_LOCK_ASSERT(stcb);
9260
9261         if ((!TAILQ_EMPTY(&stcb->asoc.asconf_send_queue)) &&
9262             (!sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_MULTIPLE_ASCONFS))) {
9263                 /* can't send a new one if there is one in flight already */
9264                 return;
9265         }
9266
9267         /* compose an ASCONF chunk, maximum length is PMTU */
9268         m_asconf = sctp_compose_asconf(stcb, &len, addr_locked);
9269         if (m_asconf == NULL) {
9270                 return;
9271         }
9272
9273         sctp_alloc_a_chunk(stcb, chk);
9274         if (chk == NULL) {
9275                 /* no memory */
9276                 sctp_m_freem(m_asconf);
9277                 return;
9278         }
9279
9280         chk->copy_by_ref = 0;
9281         chk->rec.chunk_id.id = SCTP_ASCONF;
9282         chk->rec.chunk_id.can_take_data = 0;
9283         chk->flags = CHUNK_FLAGS_FRAGMENT_OK;
9284         chk->data = m_asconf;
9285         chk->send_size = len;
9286         chk->sent = SCTP_DATAGRAM_UNSENT;
9287         chk->snd_count = 0;
9288         chk->asoc = &stcb->asoc;
9289         chk->whoTo = net;
9290         if (chk->whoTo) {
9291                 atomic_add_int(&chk->whoTo->ref_count, 1);
9292         }
9293         TAILQ_INSERT_TAIL(&chk->asoc->asconf_send_queue, chk, sctp_next);
9294         chk->asoc->ctrl_queue_cnt++;
9295         return;
9296 }
9297
9298 void
9299 sctp_send_asconf_ack(struct sctp_tcb *stcb)
9300 {
9301         /*
9302          * formulate and queue a asconf-ack back to sender. the asconf-ack
9303          * must be stored in the tcb.
9304          */
9305         struct sctp_tmit_chunk *chk;
9306         struct sctp_asconf_ack *ack, *latest_ack;
9307         struct mbuf *m_ack;
9308         struct sctp_nets *net = NULL;
9309
9310         SCTP_TCB_LOCK_ASSERT(stcb);
9311         /* Get the latest ASCONF-ACK */
9312         latest_ack = TAILQ_LAST(&stcb->asoc.asconf_ack_sent, sctp_asconf_ackhead);
9313         if (latest_ack == NULL) {
9314                 return;
9315         }
9316         if (latest_ack->last_sent_to != NULL &&
9317             latest_ack->last_sent_to == stcb->asoc.last_control_chunk_from) {
9318                 /* we're doing a retransmission */
9319                 net = sctp_find_alternate_net(stcb, stcb->asoc.last_control_chunk_from, 0);
9320                 if (net == NULL) {
9321                         /* no alternate */
9322                         if (stcb->asoc.last_control_chunk_from == NULL) {
9323                                 if (stcb->asoc.alternate) {
9324                                         net = stcb->asoc.alternate;
9325                                 } else {
9326                                         net = stcb->asoc.primary_destination;
9327                                 }
9328                         } else {
9329                                 net = stcb->asoc.last_control_chunk_from;
9330                         }
9331                 }
9332         } else {
9333                 /* normal case */
9334                 if (stcb->asoc.last_control_chunk_from == NULL) {
9335                         if (stcb->asoc.alternate) {
9336                                 net = stcb->asoc.alternate;
9337                         } else {
9338                                 net = stcb->asoc.primary_destination;
9339                         }
9340                 } else {
9341                         net = stcb->asoc.last_control_chunk_from;
9342                 }
9343         }
9344         latest_ack->last_sent_to = net;
9345
9346         TAILQ_FOREACH(ack, &stcb->asoc.asconf_ack_sent, next) {
9347                 if (ack->data == NULL) {
9348                         continue;
9349                 }
9350
9351                 /* copy the asconf_ack */
9352                 m_ack = SCTP_M_COPYM(ack->data, 0, M_COPYALL, M_NOWAIT);
9353                 if (m_ack == NULL) {
9354                         /* couldn't copy it */
9355                         return;
9356                 }
9357 #ifdef SCTP_MBUF_LOGGING
9358                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
9359                         sctp_log_mbc(m_ack, SCTP_MBUF_ICOPY);
9360                 }
9361 #endif
9362
9363                 sctp_alloc_a_chunk(stcb, chk);
9364                 if (chk == NULL) {
9365                         /* no memory */
9366                         if (m_ack)
9367                                 sctp_m_freem(m_ack);
9368                         return;
9369                 }
9370                 chk->copy_by_ref = 0;
9371                 chk->rec.chunk_id.id = SCTP_ASCONF_ACK;
9372                 chk->rec.chunk_id.can_take_data = 1;
9373                 chk->flags = CHUNK_FLAGS_FRAGMENT_OK;
9374                 chk->whoTo = net;
9375                 if (chk->whoTo) {
9376                         atomic_add_int(&chk->whoTo->ref_count, 1);
9377                 }
9378                 chk->data = m_ack;
9379                 chk->send_size = ack->len;
9380                 chk->sent = SCTP_DATAGRAM_UNSENT;
9381                 chk->snd_count = 0;
9382                 chk->asoc = &stcb->asoc;
9383
9384                 TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9385                 chk->asoc->ctrl_queue_cnt++;
9386         }
9387         return;
9388 }
9389
9390
9391 static int
9392 sctp_chunk_retransmission(struct sctp_inpcb *inp,
9393     struct sctp_tcb *stcb,
9394     struct sctp_association *asoc,
9395     int *cnt_out, struct timeval *now, int *now_filled, int *fr_done, int so_locked)
9396 {
9397         /*-
9398          * send out one MTU of retransmission. If fast_retransmit is
9399          * happening we ignore the cwnd. Otherwise we obey the cwnd and
9400          * rwnd. For a Cookie or Asconf in the control chunk queue we
9401          * retransmit them by themselves.
9402          *
9403          * For data chunks we will pick out the lowest TSN's in the sent_queue
9404          * marked for resend and bundle them all together (up to a MTU of
9405          * destination). The address to send to should have been
9406          * selected/changed where the retransmission was marked (i.e. in FR
9407          * or t3-timeout routines).
9408          */
9409         struct sctp_tmit_chunk *data_list[SCTP_MAX_DATA_BUNDLING];
9410         struct sctp_tmit_chunk *chk, *fwd;
9411         struct mbuf *m, *endofchain;
9412         struct sctp_nets *net = NULL;
9413         uint32_t tsns_sent = 0;
9414         int no_fragmentflg, bundle_at, cnt_thru;
9415         unsigned int mtu;
9416         int error, i, one_chunk, fwd_tsn, ctl_cnt, tmr_started;
9417         struct sctp_auth_chunk *auth = NULL;
9418         uint32_t auth_offset = 0;
9419         uint16_t auth_keyid;
9420         int override_ok = 1;
9421         int data_auth_reqd = 0;
9422         uint32_t dmtu = 0;
9423
9424         SCTP_TCB_LOCK_ASSERT(stcb);
9425         tmr_started = ctl_cnt = 0;
9426         no_fragmentflg = 1;
9427         fwd_tsn = 0;
9428         *cnt_out = 0;
9429         fwd = NULL;
9430         endofchain = m = NULL;
9431         auth_keyid = stcb->asoc.authinfo.active_keyid;
9432 #ifdef SCTP_AUDITING_ENABLED
9433         sctp_audit_log(0xC3, 1);
9434 #endif
9435         if ((TAILQ_EMPTY(&asoc->sent_queue)) &&
9436             (TAILQ_EMPTY(&asoc->control_send_queue))) {
9437                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "SCTP hits empty queue with cnt set to %d?\n",
9438                     asoc->sent_queue_retran_cnt);
9439                 asoc->sent_queue_cnt = 0;
9440                 asoc->sent_queue_cnt_removeable = 0;
9441                 /* send back 0/0 so we enter normal transmission */
9442                 *cnt_out = 0;
9443                 return (0);
9444         }
9445         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
9446                 if ((chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) ||
9447                     (chk->rec.chunk_id.id == SCTP_STREAM_RESET) ||
9448                     (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN)) {
9449                         if (chk->sent != SCTP_DATAGRAM_RESEND) {
9450                                 continue;
9451                         }
9452                         if (chk->rec.chunk_id.id == SCTP_STREAM_RESET) {
9453                                 if (chk != asoc->str_reset) {
9454                                         /*
9455                                          * not eligible for retran if its
9456                                          * not ours
9457                                          */
9458                                         continue;
9459                                 }
9460                         }
9461                         ctl_cnt++;
9462                         if (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN) {
9463                                 fwd_tsn = 1;
9464                         }
9465                         /*
9466                          * Add an AUTH chunk, if chunk requires it save the
9467                          * offset into the chain for AUTH
9468                          */
9469                         if ((auth == NULL) &&
9470                             (sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
9471                             stcb->asoc.peer_auth_chunks))) {
9472                                 m = sctp_add_auth_chunk(m, &endofchain,
9473                                     &auth, &auth_offset,
9474                                     stcb,
9475                                     chk->rec.chunk_id.id);
9476                                 SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
9477                         }
9478                         m = sctp_copy_mbufchain(chk->data, m, &endofchain, 0, chk->send_size, chk->copy_by_ref);
9479                         break;
9480                 }
9481         }
9482         one_chunk = 0;
9483         cnt_thru = 0;
9484         /* do we have control chunks to retransmit? */
9485         if (m != NULL) {
9486                 /* Start a timer no matter if we succeed or fail */
9487                 if (chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
9488                         sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, inp, stcb, chk->whoTo);
9489                 } else if (chk->rec.chunk_id.id == SCTP_ASCONF)
9490                         sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp, stcb, chk->whoTo);
9491                 chk->snd_count++;       /* update our count */
9492                 if ((error = sctp_lowlevel_chunk_output(inp, stcb, chk->whoTo,
9493                     (struct sockaddr *)&chk->whoTo->ro._l_addr, m,
9494                     auth_offset, auth, stcb->asoc.authinfo.active_keyid,
9495                     no_fragmentflg, 0, 0,
9496                     inp->sctp_lport, stcb->rport, htonl(stcb->asoc.peer_vtag),
9497                     chk->whoTo->port, NULL,
9498                     0, 0,
9499                     so_locked))) {
9500                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
9501                         if (error == ENOBUFS) {
9502                                 asoc->ifp_had_enobuf = 1;
9503                                 SCTP_STAT_INCR(sctps_lowlevelerr);
9504                         }
9505                         return (error);
9506                 } else {
9507                         asoc->ifp_had_enobuf = 0;
9508                 }
9509                 endofchain = NULL;
9510                 auth = NULL;
9511                 auth_offset = 0;
9512                 /*
9513                  * We don't want to mark the net->sent time here since this
9514                  * we use this for HB and retrans cannot measure RTT
9515                  */
9516                 /* (void)SCTP_GETTIME_TIMEVAL(&chk->whoTo->last_sent_time); */
9517                 *cnt_out += 1;
9518                 chk->sent = SCTP_DATAGRAM_SENT;
9519                 sctp_ucount_decr(stcb->asoc.sent_queue_retran_cnt);
9520                 if (fwd_tsn == 0) {
9521                         return (0);
9522                 } else {
9523                         /* Clean up the fwd-tsn list */
9524                         sctp_clean_up_ctl(stcb, asoc, so_locked);
9525                         return (0);
9526                 }
9527         }
9528         /*
9529          * Ok, it is just data retransmission we need to do or that and a
9530          * fwd-tsn with it all.
9531          */
9532         if (TAILQ_EMPTY(&asoc->sent_queue)) {
9533                 return (SCTP_RETRAN_DONE);
9534         }
9535         if ((SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED) ||
9536             (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_WAIT)) {
9537                 /* not yet open, resend the cookie and that is it */
9538                 return (1);
9539         }
9540 #ifdef SCTP_AUDITING_ENABLED
9541         sctp_auditing(20, inp, stcb, NULL);
9542 #endif
9543         data_auth_reqd = sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks);
9544         TAILQ_FOREACH(chk, &asoc->sent_queue, sctp_next) {
9545                 if (chk->sent != SCTP_DATAGRAM_RESEND) {
9546                         /* No, not sent to this net or not ready for rtx */
9547                         continue;
9548                 }
9549                 if (chk->data == NULL) {
9550                         SCTP_PRINTF("TSN:%x chk->snd_count:%d chk->sent:%d can't retran - no data\n",
9551                             chk->rec.data.tsn, chk->snd_count, chk->sent);
9552                         continue;
9553                 }
9554                 if ((SCTP_BASE_SYSCTL(sctp_max_retran_chunk)) &&
9555                     (chk->snd_count >= SCTP_BASE_SYSCTL(sctp_max_retran_chunk))) {
9556                         struct mbuf *op_err;
9557                         char msg[SCTP_DIAG_INFO_LEN];
9558
9559                         SCTP_SNPRINTF(msg, sizeof(msg), "TSN %8.8x retransmitted %d times, giving up",
9560                             chk->rec.data.tsn, chk->snd_count);
9561                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
9562                             msg);
9563                         atomic_add_int(&stcb->asoc.refcnt, 1);
9564                         sctp_abort_an_association(stcb->sctp_ep, stcb, op_err,
9565                             so_locked);
9566                         SCTP_TCB_LOCK(stcb);
9567                         atomic_subtract_int(&stcb->asoc.refcnt, 1);
9568                         return (SCTP_RETRAN_EXIT);
9569                 }
9570                 /* pick up the net */
9571                 net = chk->whoTo;
9572                 switch (net->ro._l_addr.sa.sa_family) {
9573 #ifdef INET
9574                 case AF_INET:
9575                         mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
9576                         break;
9577 #endif
9578 #ifdef INET6
9579                 case AF_INET6:
9580                         mtu = net->mtu - SCTP_MIN_OVERHEAD;
9581                         break;
9582 #endif
9583                 default:
9584                         /* TSNH */
9585                         mtu = net->mtu;
9586                         break;
9587                 }
9588
9589                 if ((asoc->peers_rwnd < mtu) && (asoc->total_flight > 0)) {
9590                         /* No room in peers rwnd */
9591                         uint32_t tsn;
9592
9593                         tsn = asoc->last_acked_seq + 1;
9594                         if (tsn == chk->rec.data.tsn) {
9595                                 /*
9596                                  * we make a special exception for this
9597                                  * case. The peer has no rwnd but is missing
9598                                  * the lowest chunk.. which is probably what
9599                                  * is holding up the rwnd.
9600                                  */
9601                                 goto one_chunk_around;
9602                         }
9603                         return (1);
9604                 }
9605 one_chunk_around:
9606                 if (asoc->peers_rwnd < mtu) {
9607                         one_chunk = 1;
9608                         if ((asoc->peers_rwnd == 0) &&
9609                             (asoc->total_flight == 0)) {
9610                                 chk->window_probe = 1;
9611                                 chk->whoTo->window_probe = 1;
9612                         }
9613                 }
9614 #ifdef SCTP_AUDITING_ENABLED
9615                 sctp_audit_log(0xC3, 2);
9616 #endif
9617                 bundle_at = 0;
9618                 m = NULL;
9619                 net->fast_retran_ip = 0;
9620                 if (chk->rec.data.doing_fast_retransmit == 0) {
9621                         /*
9622                          * if no FR in progress skip destination that have
9623                          * flight_size > cwnd.
9624                          */
9625                         if (net->flight_size >= net->cwnd) {
9626                                 continue;
9627                         }
9628                 } else {
9629                         /*
9630                          * Mark the destination net to have FR recovery
9631                          * limits put on it.
9632                          */
9633                         *fr_done = 1;
9634                         net->fast_retran_ip = 1;
9635                 }
9636
9637                 /*
9638                  * if no AUTH is yet included and this chunk requires it,
9639                  * make sure to account for it.  We don't apply the size
9640                  * until the AUTH chunk is actually added below in case
9641                  * there is no room for this chunk.
9642                  */
9643                 if (data_auth_reqd && (auth == NULL)) {
9644                         dmtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
9645                 } else
9646                         dmtu = 0;
9647
9648                 if ((chk->send_size <= (mtu - dmtu)) ||
9649                     (chk->flags & CHUNK_FLAGS_FRAGMENT_OK)) {
9650                         /* ok we will add this one */
9651                         if (data_auth_reqd) {
9652                                 if (auth == NULL) {
9653                                         m = sctp_add_auth_chunk(m,
9654                                             &endofchain,
9655                                             &auth,
9656                                             &auth_offset,
9657                                             stcb,
9658                                             SCTP_DATA);
9659                                         auth_keyid = chk->auth_keyid;
9660                                         override_ok = 0;
9661                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
9662                                 } else if (override_ok) {
9663                                         auth_keyid = chk->auth_keyid;
9664                                         override_ok = 0;
9665                                 } else if (chk->auth_keyid != auth_keyid) {
9666                                         /* different keyid, so done bundling */
9667                                         break;
9668                                 }
9669                         }
9670                         m = sctp_copy_mbufchain(chk->data, m, &endofchain, 0, chk->send_size, chk->copy_by_ref);
9671                         if (m == NULL) {
9672                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
9673                                 return (ENOMEM);
9674                         }
9675                         /* Do clear IP_DF ? */
9676                         if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
9677                                 no_fragmentflg = 0;
9678                         }
9679                         /* upate our MTU size */
9680                         if (mtu > (chk->send_size + dmtu))
9681                                 mtu -= (chk->send_size + dmtu);
9682                         else
9683                                 mtu = 0;
9684                         data_list[bundle_at++] = chk;
9685                         if (one_chunk && (asoc->total_flight <= 0)) {
9686                                 SCTP_STAT_INCR(sctps_windowprobed);
9687                         }
9688                 }
9689                 if (one_chunk == 0) {
9690                         /*
9691                          * now are there anymore forward from chk to pick
9692                          * up?
9693                          */
9694                         for (fwd = TAILQ_NEXT(chk, sctp_next); fwd != NULL; fwd = TAILQ_NEXT(fwd, sctp_next)) {
9695                                 if (fwd->sent != SCTP_DATAGRAM_RESEND) {
9696                                         /* Nope, not for retran */
9697                                         continue;
9698                                 }
9699                                 if (fwd->whoTo != net) {
9700                                         /* Nope, not the net in question */
9701                                         continue;
9702                                 }
9703                                 if (data_auth_reqd && (auth == NULL)) {
9704                                         dmtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
9705                                 } else
9706                                         dmtu = 0;
9707                                 if (fwd->send_size <= (mtu - dmtu)) {
9708                                         if (data_auth_reqd) {
9709                                                 if (auth == NULL) {
9710                                                         m = sctp_add_auth_chunk(m,
9711                                                             &endofchain,
9712                                                             &auth,
9713                                                             &auth_offset,
9714                                                             stcb,
9715                                                             SCTP_DATA);
9716                                                         auth_keyid = fwd->auth_keyid;
9717                                                         override_ok = 0;
9718                                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
9719                                                 } else if (override_ok) {
9720                                                         auth_keyid = fwd->auth_keyid;
9721                                                         override_ok = 0;
9722                                                 } else if (fwd->auth_keyid != auth_keyid) {
9723                                                         /*
9724                                                          * different keyid,
9725                                                          * so done bundling
9726                                                          */
9727                                                         break;
9728                                                 }
9729                                         }
9730                                         m = sctp_copy_mbufchain(fwd->data, m, &endofchain, 0, fwd->send_size, fwd->copy_by_ref);
9731                                         if (m == NULL) {
9732                                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
9733                                                 return (ENOMEM);
9734                                         }
9735                                         /* Do clear IP_DF ? */
9736                                         if (fwd->flags & CHUNK_FLAGS_FRAGMENT_OK) {
9737                                                 no_fragmentflg = 0;
9738                                         }
9739                                         /* upate our MTU size */
9740                                         if (mtu > (fwd->send_size + dmtu))
9741                                                 mtu -= (fwd->send_size + dmtu);
9742                                         else
9743                                                 mtu = 0;
9744                                         data_list[bundle_at++] = fwd;
9745                                         if (bundle_at >= SCTP_MAX_DATA_BUNDLING) {
9746                                                 break;
9747                                         }
9748                                 } else {
9749                                         /* can't fit so we are done */
9750                                         break;
9751                                 }
9752                         }
9753                 }
9754                 /* Is there something to send for this destination? */
9755                 if (m) {
9756                         /*
9757                          * No matter if we fail/or succeed we should start a
9758                          * timer. A failure is like a lost IP packet :-)
9759                          */
9760                         if (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
9761                                 /*
9762                                  * no timer running on this destination
9763                                  * restart it.
9764                                  */
9765                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
9766                                 tmr_started = 1;
9767                         }
9768                         /* Now lets send it, if there is anything to send :> */
9769                         if ((error = sctp_lowlevel_chunk_output(inp, stcb, net,
9770                             (struct sockaddr *)&net->ro._l_addr, m,
9771                             auth_offset, auth, auth_keyid,
9772                             no_fragmentflg, 0, 0,
9773                             inp->sctp_lport, stcb->rport, htonl(stcb->asoc.peer_vtag),
9774                             net->port, NULL,
9775                             0, 0,
9776                             so_locked))) {
9777                                 /* error, we could not output */
9778                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
9779                                 if (error == ENOBUFS) {
9780                                         asoc->ifp_had_enobuf = 1;
9781                                         SCTP_STAT_INCR(sctps_lowlevelerr);
9782                                 }
9783                                 return (error);
9784                         } else {
9785                                 asoc->ifp_had_enobuf = 0;
9786                         }
9787                         endofchain = NULL;
9788                         auth = NULL;
9789                         auth_offset = 0;
9790                         /* For HB's */
9791                         /*
9792                          * We don't want to mark the net->sent time here
9793                          * since this we use this for HB and retrans cannot
9794                          * measure RTT
9795                          */
9796                         /* (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time); */
9797
9798                         /* For auto-close */
9799                         cnt_thru++;
9800                         if (*now_filled == 0) {
9801                                 (void)SCTP_GETTIME_TIMEVAL(&asoc->time_last_sent);
9802                                 *now = asoc->time_last_sent;
9803                                 *now_filled = 1;
9804                         } else {
9805                                 asoc->time_last_sent = *now;
9806                         }
9807                         *cnt_out += bundle_at;
9808 #ifdef SCTP_AUDITING_ENABLED
9809                         sctp_audit_log(0xC4, bundle_at);
9810 #endif
9811                         if (bundle_at) {
9812                                 tsns_sent = data_list[0]->rec.data.tsn;
9813                         }
9814                         for (i = 0; i < bundle_at; i++) {
9815                                 SCTP_STAT_INCR(sctps_sendretransdata);
9816                                 data_list[i]->sent = SCTP_DATAGRAM_SENT;
9817                                 /*
9818                                  * When we have a revoked data, and we
9819                                  * retransmit it, then we clear the revoked
9820                                  * flag since this flag dictates if we
9821                                  * subtracted from the fs
9822                                  */
9823                                 if (data_list[i]->rec.data.chunk_was_revoked) {
9824                                         /* Deflate the cwnd */
9825                                         data_list[i]->whoTo->cwnd -= data_list[i]->book_size;
9826                                         data_list[i]->rec.data.chunk_was_revoked = 0;
9827                                 }
9828                                 data_list[i]->snd_count++;
9829                                 sctp_ucount_decr(asoc->sent_queue_retran_cnt);
9830                                 /* record the time */
9831                                 data_list[i]->sent_rcv_time = asoc->time_last_sent;
9832                                 if (data_list[i]->book_size_scale) {
9833                                         /*
9834                                          * need to double the book size on
9835                                          * this one
9836                                          */
9837                                         data_list[i]->book_size_scale = 0;
9838                                         /*
9839                                          * Since we double the booksize, we
9840                                          * must also double the output queue
9841                                          * size, since this get shrunk when
9842                                          * we free by this amount.
9843                                          */
9844                                         atomic_add_int(&((asoc)->total_output_queue_size), data_list[i]->book_size);
9845                                         data_list[i]->book_size *= 2;
9846
9847                                 } else {
9848                                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_RWND_ENABLE) {
9849                                                 sctp_log_rwnd(SCTP_DECREASE_PEER_RWND,
9850                                                     asoc->peers_rwnd, data_list[i]->send_size, SCTP_BASE_SYSCTL(sctp_peer_chunk_oh));
9851                                         }
9852                                         asoc->peers_rwnd = sctp_sbspace_sub(asoc->peers_rwnd,
9853                                             (uint32_t)(data_list[i]->send_size +
9854                                             SCTP_BASE_SYSCTL(sctp_peer_chunk_oh)));
9855                                 }
9856                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
9857                                         sctp_misc_ints(SCTP_FLIGHT_LOG_UP_RSND,
9858                                             data_list[i]->whoTo->flight_size,
9859                                             data_list[i]->book_size,
9860                                             (uint32_t)(uintptr_t)data_list[i]->whoTo,
9861                                             data_list[i]->rec.data.tsn);
9862                                 }
9863                                 sctp_flight_size_increase(data_list[i]);
9864                                 sctp_total_flight_increase(stcb, data_list[i]);
9865                                 if (asoc->peers_rwnd < stcb->sctp_ep->sctp_ep.sctp_sws_sender) {
9866                                         /* SWS sender side engages */
9867                                         asoc->peers_rwnd = 0;
9868                                 }
9869                                 if ((i == 0) &&
9870                                     (data_list[i]->rec.data.doing_fast_retransmit)) {
9871                                         SCTP_STAT_INCR(sctps_sendfastretrans);
9872                                         if ((data_list[i] == TAILQ_FIRST(&asoc->sent_queue)) &&
9873                                             (tmr_started == 0)) {
9874                                                 /*-
9875                                                  * ok we just fast-retrans'd
9876                                                  * the lowest TSN, i.e the
9877                                                  * first on the list. In
9878                                                  * this case we want to give
9879                                                  * some more time to get a
9880                                                  * SACK back without a
9881                                                  * t3-expiring.
9882                                                  */
9883                                                 sctp_timer_stop(SCTP_TIMER_TYPE_SEND, inp, stcb, net,
9884                                                     SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_2);
9885                                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
9886                                         }
9887                                 }
9888                         }
9889                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
9890                                 sctp_log_cwnd(stcb, net, tsns_sent, SCTP_CWND_LOG_FROM_RESEND);
9891                         }
9892 #ifdef SCTP_AUDITING_ENABLED
9893                         sctp_auditing(21, inp, stcb, NULL);
9894 #endif
9895                 } else {
9896                         /* None will fit */
9897                         return (1);
9898                 }
9899                 if (asoc->sent_queue_retran_cnt <= 0) {
9900                         /* all done we have no more to retran */
9901                         asoc->sent_queue_retran_cnt = 0;
9902                         break;
9903                 }
9904                 if (one_chunk) {
9905                         /* No more room in rwnd */
9906                         return (1);
9907                 }
9908                 /* stop the for loop here. we sent out a packet */
9909                 break;
9910         }
9911         return (0);
9912 }
9913
9914 static void
9915 sctp_timer_validation(struct sctp_inpcb *inp,
9916     struct sctp_tcb *stcb,
9917     struct sctp_association *asoc)
9918 {
9919         struct sctp_nets *net;
9920
9921         /* Validate that a timer is running somewhere */
9922         TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
9923                 if (SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
9924                         /* Here is a timer */
9925                         return;
9926                 }
9927         }
9928         SCTP_TCB_LOCK_ASSERT(stcb);
9929         /* Gak, we did not have a timer somewhere */
9930         SCTPDBG(SCTP_DEBUG_OUTPUT3, "Deadlock avoided starting timer on a dest at retran\n");
9931         if (asoc->alternate) {
9932                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, asoc->alternate);
9933         } else {
9934                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, asoc->primary_destination);
9935         }
9936         return;
9937 }
9938
9939 void
9940 sctp_chunk_output(struct sctp_inpcb *inp,
9941     struct sctp_tcb *stcb,
9942     int from_where,
9943     int so_locked)
9944 {
9945         /*-
9946          * Ok this is the generic chunk service queue. we must do the
9947          * following:
9948          * - See if there are retransmits pending, if so we must
9949          *   do these first.
9950          * - Service the stream queue that is next, moving any
9951          *   message (note I must get a complete message i.e.
9952          *   FIRST/MIDDLE and LAST to the out queue in one pass) and assigning
9953          *   TSN's
9954          * - Check to see if the cwnd/rwnd allows any output, if so we
9955          *   go ahead and fomulate and send the low level chunks. Making sure
9956          *   to combine any control in the control chunk queue also.
9957          */
9958         struct sctp_association *asoc;
9959         struct sctp_nets *net;
9960         int error = 0, num_out, tot_out = 0, ret = 0, reason_code;
9961         unsigned int burst_cnt = 0;
9962         struct timeval now;
9963         int now_filled = 0;
9964         int nagle_on;
9965         int frag_point = sctp_get_frag_point(stcb, &stcb->asoc);
9966         int un_sent = 0;
9967         int fr_done;
9968         unsigned int tot_frs = 0;
9969
9970         asoc = &stcb->asoc;
9971 do_it_again:
9972         /* The Nagle algorithm is only applied when handling a send call. */
9973         if (from_where == SCTP_OUTPUT_FROM_USR_SEND) {
9974                 if (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_NODELAY)) {
9975                         nagle_on = 0;
9976                 } else {
9977                         nagle_on = 1;
9978                 }
9979         } else {
9980                 nagle_on = 0;
9981         }
9982         SCTP_TCB_LOCK_ASSERT(stcb);
9983
9984         un_sent = (stcb->asoc.total_output_queue_size - stcb->asoc.total_flight);
9985
9986         if ((un_sent <= 0) &&
9987             (TAILQ_EMPTY(&asoc->control_send_queue)) &&
9988             (TAILQ_EMPTY(&asoc->asconf_send_queue)) &&
9989             (asoc->sent_queue_retran_cnt == 0) &&
9990             (asoc->trigger_reset == 0)) {
9991                 /* Nothing to do unless there is something to be sent left */
9992                 return;
9993         }
9994         /*
9995          * Do we have something to send, data or control AND a sack timer
9996          * running, if so piggy-back the sack.
9997          */
9998         if (SCTP_OS_TIMER_PENDING(&stcb->asoc.dack_timer.timer)) {
9999                 sctp_send_sack(stcb, so_locked);
10000                 sctp_timer_stop(SCTP_TIMER_TYPE_RECV, stcb->sctp_ep, stcb, NULL,
10001                     SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_3);
10002         }
10003         while (asoc->sent_queue_retran_cnt) {
10004                 /*-
10005                  * Ok, it is retransmission time only, we send out only ONE
10006                  * packet with a single call off to the retran code.
10007                  */
10008                 if (from_where == SCTP_OUTPUT_FROM_COOKIE_ACK) {
10009                         /*-
10010                          * Special hook for handling cookiess discarded
10011                          * by peer that carried data. Send cookie-ack only
10012                          * and then the next call with get the retran's.
10013                          */
10014                         (void)sctp_med_chunk_output(inp, stcb, asoc, &num_out, &reason_code, 1,
10015                             from_where,
10016                             &now, &now_filled, frag_point, so_locked);
10017                         return;
10018                 } else if (from_where != SCTP_OUTPUT_FROM_HB_TMR) {
10019                         /* if its not from a HB then do it */
10020                         fr_done = 0;
10021                         ret = sctp_chunk_retransmission(inp, stcb, asoc, &num_out, &now, &now_filled, &fr_done, so_locked);
10022                         if (fr_done) {
10023                                 tot_frs++;
10024                         }
10025                 } else {
10026                         /*
10027                          * its from any other place, we don't allow retran
10028                          * output (only control)
10029                          */
10030                         ret = 1;
10031                 }
10032                 if (ret > 0) {
10033                         /* Can't send anymore */
10034                         /*-
10035                          * now lets push out control by calling med-level
10036                          * output once. this assures that we WILL send HB's
10037                          * if queued too.
10038                          */
10039                         (void)sctp_med_chunk_output(inp, stcb, asoc, &num_out, &reason_code, 1,
10040                             from_where,
10041                             &now, &now_filled, frag_point, so_locked);
10042 #ifdef SCTP_AUDITING_ENABLED
10043                         sctp_auditing(8, inp, stcb, NULL);
10044 #endif
10045                         sctp_timer_validation(inp, stcb, asoc);
10046                         return;
10047                 }
10048                 if (ret < 0) {
10049                         /*-
10050                          * The count was off.. retran is not happening so do
10051                          * the normal retransmission.
10052                          */
10053 #ifdef SCTP_AUDITING_ENABLED
10054                         sctp_auditing(9, inp, stcb, NULL);
10055 #endif
10056                         if (ret == SCTP_RETRAN_EXIT) {
10057                                 return;
10058                         }
10059                         break;
10060                 }
10061                 if (from_where == SCTP_OUTPUT_FROM_T3) {
10062                         /* Only one transmission allowed out of a timeout */
10063 #ifdef SCTP_AUDITING_ENABLED
10064                         sctp_auditing(10, inp, stcb, NULL);
10065 #endif
10066                         /* Push out any control */
10067                         (void)sctp_med_chunk_output(inp, stcb, asoc, &num_out, &reason_code, 1, from_where,
10068                             &now, &now_filled, frag_point, so_locked);
10069                         return;
10070                 }
10071                 if ((asoc->fr_max_burst > 0) && (tot_frs >= asoc->fr_max_burst)) {
10072                         /* Hit FR burst limit */
10073                         return;
10074                 }
10075                 if ((num_out == 0) && (ret == 0)) {
10076                         /* No more retrans to send */
10077                         break;
10078                 }
10079         }
10080 #ifdef SCTP_AUDITING_ENABLED
10081         sctp_auditing(12, inp, stcb, NULL);
10082 #endif
10083         /* Check for bad destinations, if they exist move chunks around. */
10084         TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
10085                 if (!(net->dest_state & SCTP_ADDR_REACHABLE)) {
10086                         /*-
10087                          * if possible move things off of this address we
10088                          * still may send below due to the dormant state but
10089                          * we try to find an alternate address to send to
10090                          * and if we have one we move all queued data on the
10091                          * out wheel to this alternate address.
10092                          */
10093                         if (net->ref_count > 1)
10094                                 sctp_move_chunks_from_net(stcb, net);
10095                 } else {
10096                         /*-
10097                          * if ((asoc->sat_network) || (net->addr_is_local))
10098                          * { burst_limit = asoc->max_burst *
10099                          * SCTP_SAT_NETWORK_BURST_INCR; }
10100                          */
10101                         if (asoc->max_burst > 0) {
10102                                 if (SCTP_BASE_SYSCTL(sctp_use_cwnd_based_maxburst)) {
10103                                         if ((net->flight_size + (asoc->max_burst * net->mtu)) < net->cwnd) {
10104                                                 /*
10105                                                  * JRS - Use the congestion
10106                                                  * control given in the
10107                                                  * congestion control module
10108                                                  */
10109                                                 asoc->cc_functions.sctp_cwnd_update_after_output(stcb, net, asoc->max_burst);
10110                                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_MAXBURST_ENABLE) {
10111                                                         sctp_log_maxburst(stcb, net, 0, asoc->max_burst, SCTP_MAX_BURST_APPLIED);
10112                                                 }
10113                                                 SCTP_STAT_INCR(sctps_maxburstqueued);
10114                                         }
10115                                         net->fast_retran_ip = 0;
10116                                 } else {
10117                                         if (net->flight_size == 0) {
10118                                                 /*
10119                                                  * Should be decaying the
10120                                                  * cwnd here
10121                                                  */
10122                                                 ;
10123                                         }
10124                                 }
10125                         }
10126                 }
10127
10128         }
10129         burst_cnt = 0;
10130         do {
10131                 error = sctp_med_chunk_output(inp, stcb, asoc, &num_out,
10132                     &reason_code, 0, from_where,
10133                     &now, &now_filled, frag_point, so_locked);
10134                 if (error) {
10135                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Error %d was returned from med-c-op\n", error);
10136                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_MAXBURST_ENABLE) {
10137                                 sctp_log_maxburst(stcb, asoc->primary_destination, error, burst_cnt, SCTP_MAX_BURST_ERROR_STOP);
10138                         }
10139                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
10140                                 sctp_log_cwnd(stcb, NULL, error, SCTP_SEND_NOW_COMPLETES);
10141                                 sctp_log_cwnd(stcb, NULL, 0xdeadbeef, SCTP_SEND_NOW_COMPLETES);
10142                         }
10143                         break;
10144                 }
10145                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "m-c-o put out %d\n", num_out);
10146
10147                 tot_out += num_out;
10148                 burst_cnt++;
10149                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
10150                         sctp_log_cwnd(stcb, NULL, num_out, SCTP_SEND_NOW_COMPLETES);
10151                         if (num_out == 0) {
10152                                 sctp_log_cwnd(stcb, NULL, reason_code, SCTP_SEND_NOW_COMPLETES);
10153                         }
10154                 }
10155                 if (nagle_on) {
10156                         /*
10157                          * When the Nagle algorithm is used, look at how
10158                          * much is unsent, then if its smaller than an MTU
10159                          * and we have data in flight we stop, except if we
10160                          * are handling a fragmented user message.
10161                          */
10162                         un_sent = stcb->asoc.total_output_queue_size - stcb->asoc.total_flight;
10163                         if ((un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD)) &&
10164                             (stcb->asoc.total_flight > 0)) {
10165 /*      &&                   sctp_is_feature_on(inp, SCTP_PCB_FLAGS_EXPLICIT_EOR))) {*/
10166                                 break;
10167                         }
10168                 }
10169                 if (TAILQ_EMPTY(&asoc->control_send_queue) &&
10170                     TAILQ_EMPTY(&asoc->send_queue) &&
10171                     sctp_is_there_unsent_data(stcb, so_locked) == 0) {
10172                         /* Nothing left to send */
10173                         break;
10174                 }
10175                 if ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) <= 0) {
10176                         /* Nothing left to send */
10177                         break;
10178                 }
10179         } while (num_out &&
10180             ((asoc->max_burst == 0) ||
10181             SCTP_BASE_SYSCTL(sctp_use_cwnd_based_maxburst) ||
10182             (burst_cnt < asoc->max_burst)));
10183
10184         if (SCTP_BASE_SYSCTL(sctp_use_cwnd_based_maxburst) == 0) {
10185                 if ((asoc->max_burst > 0) && (burst_cnt >= asoc->max_burst)) {
10186                         SCTP_STAT_INCR(sctps_maxburstqueued);
10187                         asoc->burst_limit_applied = 1;
10188                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_MAXBURST_ENABLE) {
10189                                 sctp_log_maxburst(stcb, asoc->primary_destination, 0, burst_cnt, SCTP_MAX_BURST_APPLIED);
10190                         }
10191                 } else {
10192                         asoc->burst_limit_applied = 0;
10193                 }
10194         }
10195         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
10196                 sctp_log_cwnd(stcb, NULL, tot_out, SCTP_SEND_NOW_COMPLETES);
10197         }
10198         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Ok, we have put out %d chunks\n",
10199             tot_out);
10200
10201         /*-
10202          * Now we need to clean up the control chunk chain if a ECNE is on
10203          * it. It must be marked as UNSENT again so next call will continue
10204          * to send it until such time that we get a CWR, to remove it.
10205          */
10206         if (stcb->asoc.ecn_echo_cnt_onq)
10207                 sctp_fix_ecn_echo(asoc);
10208
10209         if (stcb->asoc.trigger_reset) {
10210                 if (sctp_send_stream_reset_out_if_possible(stcb, so_locked) == 0) {
10211                         goto do_it_again;
10212                 }
10213         }
10214         return;
10215 }
10216
10217
10218 int
10219 sctp_output(
10220     struct sctp_inpcb *inp,
10221     struct mbuf *m,
10222     struct sockaddr *addr,
10223     struct mbuf *control,
10224     struct thread *p,
10225     int flags)
10226 {
10227         if (inp == NULL) {
10228                 SCTP_LTRACE_ERR_RET_PKT(m, inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
10229                 return (EINVAL);
10230         }
10231
10232         if (inp->sctp_socket == NULL) {
10233                 SCTP_LTRACE_ERR_RET_PKT(m, inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
10234                 return (EINVAL);
10235         }
10236         return (sctp_sosend(inp->sctp_socket,
10237             addr,
10238             (struct uio *)NULL,
10239             m,
10240             control,
10241             flags, p
10242             ));
10243 }
10244
10245 void
10246 send_forward_tsn(struct sctp_tcb *stcb,
10247     struct sctp_association *asoc)
10248 {
10249         struct sctp_tmit_chunk *chk, *at, *tp1, *last;
10250         struct sctp_forward_tsn_chunk *fwdtsn;
10251         struct sctp_strseq *strseq;
10252         struct sctp_strseq_mid *strseq_m;
10253         uint32_t advance_peer_ack_point;
10254         unsigned int cnt_of_space, i, ovh;
10255         unsigned int space_needed;
10256         unsigned int cnt_of_skipped = 0;
10257
10258         SCTP_TCB_LOCK_ASSERT(stcb);
10259         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
10260                 if (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN) {
10261                         /* mark it to unsent */
10262                         chk->sent = SCTP_DATAGRAM_UNSENT;
10263                         chk->snd_count = 0;
10264                         /* Do we correct its output location? */
10265                         if (chk->whoTo) {
10266                                 sctp_free_remote_addr(chk->whoTo);
10267                                 chk->whoTo = NULL;
10268                         }
10269                         goto sctp_fill_in_rest;
10270                 }
10271         }
10272         /* Ok if we reach here we must build one */
10273         sctp_alloc_a_chunk(stcb, chk);
10274         if (chk == NULL) {
10275                 return;
10276         }
10277         asoc->fwd_tsn_cnt++;
10278         chk->copy_by_ref = 0;
10279         /*
10280          * We don't do the old thing here since this is used not for on-wire
10281          * but to tell if we are sending a fwd-tsn by the stack during
10282          * output. And if its a IFORWARD or a FORWARD it is a fwd-tsn.
10283          */
10284         chk->rec.chunk_id.id = SCTP_FORWARD_CUM_TSN;
10285         chk->rec.chunk_id.can_take_data = 0;
10286         chk->flags = 0;
10287         chk->asoc = asoc;
10288         chk->whoTo = NULL;
10289         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
10290         if (chk->data == NULL) {
10291                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
10292                 return;
10293         }
10294         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
10295         chk->sent = SCTP_DATAGRAM_UNSENT;
10296         chk->snd_count = 0;
10297         TAILQ_INSERT_TAIL(&asoc->control_send_queue, chk, sctp_next);
10298         asoc->ctrl_queue_cnt++;
10299 sctp_fill_in_rest:
10300         /*-
10301          * Here we go through and fill out the part that deals with
10302          * stream/seq of the ones we skip.
10303          */
10304         SCTP_BUF_LEN(chk->data) = 0;
10305         TAILQ_FOREACH(at, &asoc->sent_queue, sctp_next) {
10306                 if ((at->sent != SCTP_FORWARD_TSN_SKIP) &&
10307                     (at->sent != SCTP_DATAGRAM_NR_ACKED)) {
10308                         /* no more to look at */
10309                         break;
10310                 }
10311                 if (!asoc->idata_supported && (at->rec.data.rcv_flags & SCTP_DATA_UNORDERED)) {
10312                         /* We don't report these */
10313                         continue;
10314                 }
10315                 cnt_of_skipped++;
10316         }
10317         if (asoc->idata_supported) {
10318                 space_needed = (sizeof(struct sctp_forward_tsn_chunk) +
10319                     (cnt_of_skipped * sizeof(struct sctp_strseq_mid)));
10320         } else {
10321                 space_needed = (sizeof(struct sctp_forward_tsn_chunk) +
10322                     (cnt_of_skipped * sizeof(struct sctp_strseq)));
10323         }
10324         cnt_of_space = (unsigned int)M_TRAILINGSPACE(chk->data);
10325
10326         if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
10327                 ovh = SCTP_MIN_OVERHEAD;
10328         } else {
10329                 ovh = SCTP_MIN_V4_OVERHEAD;
10330         }
10331         if (cnt_of_space > (asoc->smallest_mtu - ovh)) {
10332                 /* trim to a mtu size */
10333                 cnt_of_space = asoc->smallest_mtu - ovh;
10334         }
10335         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_TRY_ADVANCE) {
10336                 sctp_misc_ints(SCTP_FWD_TSN_CHECK,
10337                     0xff, 0, cnt_of_skipped,
10338                     asoc->advanced_peer_ack_point);
10339         }
10340         advance_peer_ack_point = asoc->advanced_peer_ack_point;
10341         if (cnt_of_space < space_needed) {
10342                 /*-
10343                  * ok we must trim down the chunk by lowering the
10344                  * advance peer ack point.
10345                  */
10346                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_TRY_ADVANCE) {
10347                         sctp_misc_ints(SCTP_FWD_TSN_CHECK,
10348                             0xff, 0xff, cnt_of_space,
10349                             space_needed);
10350                 }
10351                 cnt_of_skipped = cnt_of_space - sizeof(struct sctp_forward_tsn_chunk);
10352                 if (asoc->idata_supported) {
10353                         cnt_of_skipped /= sizeof(struct sctp_strseq_mid);
10354                 } else {
10355                         cnt_of_skipped /= sizeof(struct sctp_strseq);
10356                 }
10357                 /*-
10358                  * Go through and find the TSN that will be the one
10359                  * we report.
10360                  */
10361                 at = TAILQ_FIRST(&asoc->sent_queue);
10362                 if (at != NULL) {
10363                         for (i = 0; i < cnt_of_skipped; i++) {
10364                                 tp1 = TAILQ_NEXT(at, sctp_next);
10365                                 if (tp1 == NULL) {
10366                                         break;
10367                                 }
10368                                 at = tp1;
10369                         }
10370                 }
10371                 if (at && SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_TRY_ADVANCE) {
10372                         sctp_misc_ints(SCTP_FWD_TSN_CHECK,
10373                             0xff, cnt_of_skipped, at->rec.data.tsn,
10374                             asoc->advanced_peer_ack_point);
10375                 }
10376                 last = at;
10377                 /*-
10378                  * last now points to last one I can report, update
10379                  * peer ack point
10380                  */
10381                 if (last) {
10382                         advance_peer_ack_point = last->rec.data.tsn;
10383                 }
10384                 if (asoc->idata_supported) {
10385                         space_needed = sizeof(struct sctp_forward_tsn_chunk) +
10386                             cnt_of_skipped * sizeof(struct sctp_strseq_mid);
10387                 } else {
10388                         space_needed = sizeof(struct sctp_forward_tsn_chunk) +
10389                             cnt_of_skipped * sizeof(struct sctp_strseq);
10390                 }
10391         }
10392         chk->send_size = space_needed;
10393         /* Setup the chunk */
10394         fwdtsn = mtod(chk->data, struct sctp_forward_tsn_chunk *);
10395         fwdtsn->ch.chunk_length = htons(chk->send_size);
10396         fwdtsn->ch.chunk_flags = 0;
10397         if (asoc->idata_supported) {
10398                 fwdtsn->ch.chunk_type = SCTP_IFORWARD_CUM_TSN;
10399         } else {
10400                 fwdtsn->ch.chunk_type = SCTP_FORWARD_CUM_TSN;
10401         }
10402         fwdtsn->new_cumulative_tsn = htonl(advance_peer_ack_point);
10403         SCTP_BUF_LEN(chk->data) = chk->send_size;
10404         fwdtsn++;
10405         /*-
10406          * Move pointer to after the fwdtsn and transfer to the
10407          * strseq pointer.
10408          */
10409         if (asoc->idata_supported) {
10410                 strseq_m = (struct sctp_strseq_mid *)fwdtsn;
10411                 strseq = NULL;
10412         } else {
10413                 strseq = (struct sctp_strseq *)fwdtsn;
10414                 strseq_m = NULL;
10415         }
10416         /*-
10417          * Now populate the strseq list. This is done blindly
10418          * without pulling out duplicate stream info. This is
10419          * inefficent but won't harm the process since the peer will
10420          * look at these in sequence and will thus release anything.
10421          * It could mean we exceed the PMTU and chop off some that
10422          * we could have included.. but this is unlikely (aka 1432/4
10423          * would mean 300+ stream seq's would have to be reported in
10424          * one FWD-TSN. With a bit of work we can later FIX this to
10425          * optimize and pull out duplicates.. but it does add more
10426          * overhead. So for now... not!
10427          */
10428         i = 0;
10429         TAILQ_FOREACH(at, &asoc->sent_queue, sctp_next) {
10430                 if (i >= cnt_of_skipped) {
10431                         break;
10432                 }
10433                 if (!asoc->idata_supported && (at->rec.data.rcv_flags & SCTP_DATA_UNORDERED)) {
10434                         /* We don't report these */
10435                         continue;
10436                 }
10437                 if (at->rec.data.tsn == advance_peer_ack_point) {
10438                         at->rec.data.fwd_tsn_cnt = 0;
10439                 }
10440                 if (asoc->idata_supported) {
10441                         strseq_m->sid = htons(at->rec.data.sid);
10442                         if (at->rec.data.rcv_flags & SCTP_DATA_UNORDERED) {
10443                                 strseq_m->flags = htons(PR_SCTP_UNORDERED_FLAG);
10444                         } else {
10445                                 strseq_m->flags = 0;
10446                         }
10447                         strseq_m->mid = htonl(at->rec.data.mid);
10448                         strseq_m++;
10449                 } else {
10450                         strseq->sid = htons(at->rec.data.sid);
10451                         strseq->ssn = htons((uint16_t)at->rec.data.mid);
10452                         strseq++;
10453                 }
10454                 i++;
10455         }
10456         return;
10457 }
10458
10459 void
10460 sctp_send_sack(struct sctp_tcb *stcb, int so_locked)
10461 {
10462         /*-
10463          * Queue up a SACK or NR-SACK in the control queue.
10464          * We must first check to see if a SACK or NR-SACK is
10465          * somehow on the control queue.
10466          * If so, we will take and and remove the old one.
10467          */
10468         struct sctp_association *asoc;
10469         struct sctp_tmit_chunk *chk, *a_chk;
10470         struct sctp_sack_chunk *sack;
10471         struct sctp_nr_sack_chunk *nr_sack;
10472         struct sctp_gap_ack_block *gap_descriptor;
10473         const struct sack_track *selector;
10474         int mergeable = 0;
10475         int offset;
10476         caddr_t limit;
10477         uint32_t *dup;
10478         int limit_reached = 0;
10479         unsigned int i, siz, j;
10480         unsigned int num_gap_blocks = 0, num_nr_gap_blocks = 0, space;
10481         int num_dups = 0;
10482         int space_req;
10483         uint32_t highest_tsn;
10484         uint8_t flags;
10485         uint8_t type;
10486         uint8_t tsn_map;
10487
10488         if (stcb->asoc.nrsack_supported == 1) {
10489                 type = SCTP_NR_SELECTIVE_ACK;
10490         } else {
10491                 type = SCTP_SELECTIVE_ACK;
10492         }
10493         a_chk = NULL;
10494         asoc = &stcb->asoc;
10495         SCTP_TCB_LOCK_ASSERT(stcb);
10496         if (asoc->last_data_chunk_from == NULL) {
10497                 /* Hmm we never received anything */
10498                 return;
10499         }
10500         sctp_slide_mapping_arrays(stcb);
10501         sctp_set_rwnd(stcb, asoc);
10502         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
10503                 if (chk->rec.chunk_id.id == type) {
10504                         /* Hmm, found a sack already on queue, remove it */
10505                         TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
10506                         asoc->ctrl_queue_cnt--;
10507                         a_chk = chk;
10508                         if (a_chk->data) {
10509                                 sctp_m_freem(a_chk->data);
10510                                 a_chk->data = NULL;
10511                         }
10512                         if (a_chk->whoTo) {
10513                                 sctp_free_remote_addr(a_chk->whoTo);
10514                                 a_chk->whoTo = NULL;
10515                         }
10516                         break;
10517                 }
10518         }
10519         if (a_chk == NULL) {
10520                 sctp_alloc_a_chunk(stcb, a_chk);
10521                 if (a_chk == NULL) {
10522                         /* No memory so we drop the idea, and set a timer */
10523                         if (stcb->asoc.delayed_ack) {
10524                                 sctp_timer_stop(SCTP_TIMER_TYPE_RECV,
10525                                     stcb->sctp_ep, stcb, NULL,
10526                                     SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_4);
10527                                 sctp_timer_start(SCTP_TIMER_TYPE_RECV,
10528                                     stcb->sctp_ep, stcb, NULL);
10529                         } else {
10530                                 stcb->asoc.send_sack = 1;
10531                         }
10532                         return;
10533                 }
10534                 a_chk->copy_by_ref = 0;
10535                 a_chk->rec.chunk_id.id = type;
10536                 a_chk->rec.chunk_id.can_take_data = 1;
10537         }
10538         /* Clear our pkt counts */
10539         asoc->data_pkts_seen = 0;
10540
10541         a_chk->flags = 0;
10542         a_chk->asoc = asoc;
10543         a_chk->snd_count = 0;
10544         a_chk->send_size = 0;   /* fill in later */
10545         a_chk->sent = SCTP_DATAGRAM_UNSENT;
10546         a_chk->whoTo = NULL;
10547
10548         if (!(asoc->last_data_chunk_from->dest_state & SCTP_ADDR_REACHABLE)) {
10549                 /*-
10550                  * Ok, the destination for the SACK is unreachable, lets see if
10551                  * we can select an alternate to asoc->last_data_chunk_from
10552                  */
10553                 a_chk->whoTo = sctp_find_alternate_net(stcb, asoc->last_data_chunk_from, 0);
10554                 if (a_chk->whoTo == NULL) {
10555                         /* Nope, no alternate */
10556                         a_chk->whoTo = asoc->last_data_chunk_from;
10557                 }
10558         } else {
10559                 a_chk->whoTo = asoc->last_data_chunk_from;
10560         }
10561         if (a_chk->whoTo) {
10562                 atomic_add_int(&a_chk->whoTo->ref_count, 1);
10563         }
10564         if (SCTP_TSN_GT(asoc->highest_tsn_inside_map, asoc->highest_tsn_inside_nr_map)) {
10565                 highest_tsn = asoc->highest_tsn_inside_map;
10566         } else {
10567                 highest_tsn = asoc->highest_tsn_inside_nr_map;
10568         }
10569         if (highest_tsn == asoc->cumulative_tsn) {
10570                 /* no gaps */
10571                 if (type == SCTP_SELECTIVE_ACK) {
10572                         space_req = sizeof(struct sctp_sack_chunk);
10573                 } else {
10574                         space_req = sizeof(struct sctp_nr_sack_chunk);
10575                 }
10576         } else {
10577                 /* gaps get a cluster */
10578                 space_req = MCLBYTES;
10579         }
10580         /* Ok now lets formulate a MBUF with our sack */
10581         a_chk->data = sctp_get_mbuf_for_msg(space_req, 0, M_NOWAIT, 1, MT_DATA);
10582         if ((a_chk->data == NULL) ||
10583             (a_chk->whoTo == NULL)) {
10584                 /* rats, no mbuf memory */
10585                 if (a_chk->data) {
10586                         /* was a problem with the destination */
10587                         sctp_m_freem(a_chk->data);
10588                         a_chk->data = NULL;
10589                 }
10590                 sctp_free_a_chunk(stcb, a_chk, so_locked);
10591                 /* sa_ignore NO_NULL_CHK */
10592                 if (stcb->asoc.delayed_ack) {
10593                         sctp_timer_stop(SCTP_TIMER_TYPE_RECV,
10594                             stcb->sctp_ep, stcb, NULL,
10595                             SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_5);
10596                         sctp_timer_start(SCTP_TIMER_TYPE_RECV,
10597                             stcb->sctp_ep, stcb, NULL);
10598                 } else {
10599                         stcb->asoc.send_sack = 1;
10600                 }
10601                 return;
10602         }
10603         /* ok, lets go through and fill it in */
10604         SCTP_BUF_RESV_UF(a_chk->data, SCTP_MIN_OVERHEAD);
10605         space = (unsigned int)M_TRAILINGSPACE(a_chk->data);
10606         if (space > (a_chk->whoTo->mtu - SCTP_MIN_OVERHEAD)) {
10607                 space = (a_chk->whoTo->mtu - SCTP_MIN_OVERHEAD);
10608         }
10609         limit = mtod(a_chk->data, caddr_t);
10610         limit += space;
10611
10612         flags = 0;
10613
10614         if ((asoc->sctp_cmt_on_off > 0) &&
10615             SCTP_BASE_SYSCTL(sctp_cmt_use_dac)) {
10616                 /*-
10617                  * CMT DAC algorithm: If 2 (i.e., 0x10) packets have been
10618                  * received, then set high bit to 1, else 0. Reset
10619                  * pkts_rcvd.
10620                  */
10621                 flags |= (asoc->cmt_dac_pkts_rcvd << 6);
10622                 asoc->cmt_dac_pkts_rcvd = 0;
10623         }
10624 #ifdef SCTP_ASOCLOG_OF_TSNS
10625         stcb->asoc.cumack_logsnt[stcb->asoc.cumack_log_atsnt] = asoc->cumulative_tsn;
10626         stcb->asoc.cumack_log_atsnt++;
10627         if (stcb->asoc.cumack_log_atsnt >= SCTP_TSN_LOG_SIZE) {
10628                 stcb->asoc.cumack_log_atsnt = 0;
10629         }
10630 #endif
10631         /* reset the readers interpretation */
10632         stcb->freed_by_sorcv_sincelast = 0;
10633
10634         if (type == SCTP_SELECTIVE_ACK) {
10635                 sack = mtod(a_chk->data, struct sctp_sack_chunk *);
10636                 nr_sack = NULL;
10637                 gap_descriptor = (struct sctp_gap_ack_block *)((caddr_t)sack + sizeof(struct sctp_sack_chunk));
10638                 if (highest_tsn > asoc->mapping_array_base_tsn) {
10639                         siz = (((highest_tsn - asoc->mapping_array_base_tsn) + 1) + 7) / 8;
10640                 } else {
10641                         siz = (((MAX_TSN - asoc->mapping_array_base_tsn) + 1) + highest_tsn + 7) / 8;
10642                 }
10643         } else {
10644                 sack = NULL;
10645                 nr_sack = mtod(a_chk->data, struct sctp_nr_sack_chunk *);
10646                 gap_descriptor = (struct sctp_gap_ack_block *)((caddr_t)nr_sack + sizeof(struct sctp_nr_sack_chunk));
10647                 if (asoc->highest_tsn_inside_map > asoc->mapping_array_base_tsn) {
10648                         siz = (((asoc->highest_tsn_inside_map - asoc->mapping_array_base_tsn) + 1) + 7) / 8;
10649                 } else {
10650                         siz = (((MAX_TSN - asoc->mapping_array_base_tsn) + 1) + asoc->highest_tsn_inside_map + 7) / 8;
10651                 }
10652         }
10653
10654         if (SCTP_TSN_GT(asoc->mapping_array_base_tsn, asoc->cumulative_tsn)) {
10655                 offset = 1;
10656         } else {
10657                 offset = asoc->mapping_array_base_tsn - asoc->cumulative_tsn;
10658         }
10659         if (((type == SCTP_SELECTIVE_ACK) &&
10660             SCTP_TSN_GT(highest_tsn, asoc->cumulative_tsn)) ||
10661             ((type == SCTP_NR_SELECTIVE_ACK) &&
10662             SCTP_TSN_GT(asoc->highest_tsn_inside_map, asoc->cumulative_tsn))) {
10663                 /* we have a gap .. maybe */
10664                 for (i = 0; i < siz; i++) {
10665                         tsn_map = asoc->mapping_array[i];
10666                         if (type == SCTP_SELECTIVE_ACK) {
10667                                 tsn_map |= asoc->nr_mapping_array[i];
10668                         }
10669                         if (i == 0) {
10670                                 /*
10671                                  * Clear all bits corresponding to TSNs
10672                                  * smaller or equal to the cumulative TSN.
10673                                  */
10674                                 tsn_map &= (~0U << (1 - offset));
10675                         }
10676                         selector = &sack_array[tsn_map];
10677                         if (mergeable && selector->right_edge) {
10678                                 /*
10679                                  * Backup, left and right edges were ok to
10680                                  * merge.
10681                                  */
10682                                 num_gap_blocks--;
10683                                 gap_descriptor--;
10684                         }
10685                         if (selector->num_entries == 0)
10686                                 mergeable = 0;
10687                         else {
10688                                 for (j = 0; j < selector->num_entries; j++) {
10689                                         if (mergeable && selector->right_edge) {
10690                                                 /*
10691                                                  * do a merge by NOT setting
10692                                                  * the left side
10693                                                  */
10694                                                 mergeable = 0;
10695                                         } else {
10696                                                 /*
10697                                                  * no merge, set the left
10698                                                  * side
10699                                                  */
10700                                                 mergeable = 0;
10701                                                 gap_descriptor->start = htons((selector->gaps[j].start + offset));
10702                                         }
10703                                         gap_descriptor->end = htons((selector->gaps[j].end + offset));
10704                                         num_gap_blocks++;
10705                                         gap_descriptor++;
10706                                         if (((caddr_t)gap_descriptor + sizeof(struct sctp_gap_ack_block)) > limit) {
10707                                                 /* no more room */
10708                                                 limit_reached = 1;
10709                                                 break;
10710                                         }
10711                                 }
10712                                 if (selector->left_edge) {
10713                                         mergeable = 1;
10714                                 }
10715                         }
10716                         if (limit_reached) {
10717                                 /* Reached the limit stop */
10718                                 break;
10719                         }
10720                         offset += 8;
10721                 }
10722         }
10723         if ((type == SCTP_NR_SELECTIVE_ACK) &&
10724             (limit_reached == 0)) {
10725
10726                 mergeable = 0;
10727
10728                 if (asoc->highest_tsn_inside_nr_map > asoc->mapping_array_base_tsn) {
10729                         siz = (((asoc->highest_tsn_inside_nr_map - asoc->mapping_array_base_tsn) + 1) + 7) / 8;
10730                 } else {
10731                         siz = (((MAX_TSN - asoc->mapping_array_base_tsn) + 1) + asoc->highest_tsn_inside_nr_map + 7) / 8;
10732                 }
10733
10734                 if (SCTP_TSN_GT(asoc->mapping_array_base_tsn, asoc->cumulative_tsn)) {
10735                         offset = 1;
10736                 } else {
10737                         offset = asoc->mapping_array_base_tsn - asoc->cumulative_tsn;
10738                 }
10739                 if (SCTP_TSN_GT(asoc->highest_tsn_inside_nr_map, asoc->cumulative_tsn)) {
10740                         /* we have a gap .. maybe */
10741                         for (i = 0; i < siz; i++) {
10742                                 tsn_map = asoc->nr_mapping_array[i];
10743                                 if (i == 0) {
10744                                         /*
10745                                          * Clear all bits corresponding to
10746                                          * TSNs smaller or equal to the
10747                                          * cumulative TSN.
10748                                          */
10749                                         tsn_map &= (~0U << (1 - offset));
10750                                 }
10751                                 selector = &sack_array[tsn_map];
10752                                 if (mergeable && selector->right_edge) {
10753                                         /*
10754                                          * Backup, left and right edges were
10755                                          * ok to merge.
10756                                          */
10757                                         num_nr_gap_blocks--;
10758                                         gap_descriptor--;
10759                                 }
10760                                 if (selector->num_entries == 0)
10761                                         mergeable = 0;
10762                                 else {
10763                                         for (j = 0; j < selector->num_entries; j++) {
10764                                                 if (mergeable && selector->right_edge) {
10765                                                         /*
10766                                                          * do a merge by NOT
10767                                                          * setting the left
10768                                                          * side
10769                                                          */
10770                                                         mergeable = 0;
10771                                                 } else {
10772                                                         /*
10773                                                          * no merge, set the
10774                                                          * left side
10775                                                          */
10776                                                         mergeable = 0;
10777                                                         gap_descriptor->start = htons((selector->gaps[j].start + offset));
10778                                                 }
10779                                                 gap_descriptor->end = htons((selector->gaps[j].end + offset));
10780                                                 num_nr_gap_blocks++;
10781                                                 gap_descriptor++;
10782                                                 if (((caddr_t)gap_descriptor + sizeof(struct sctp_gap_ack_block)) > limit) {
10783                                                         /* no more room */
10784                                                         limit_reached = 1;
10785                                                         break;
10786                                                 }
10787                                         }
10788                                         if (selector->left_edge) {
10789                                                 mergeable = 1;
10790                                         }
10791                                 }
10792                                 if (limit_reached) {
10793                                         /* Reached the limit stop */
10794                                         break;
10795                                 }
10796                                 offset += 8;
10797                         }
10798                 }
10799         }
10800         /* now we must add any dups we are going to report. */
10801         if ((limit_reached == 0) && (asoc->numduptsns)) {
10802                 dup = (uint32_t *)gap_descriptor;
10803                 for (i = 0; i < asoc->numduptsns; i++) {
10804                         *dup = htonl(asoc->dup_tsns[i]);
10805                         dup++;
10806                         num_dups++;
10807                         if (((caddr_t)dup + sizeof(uint32_t)) > limit) {
10808                                 /* no more room */
10809                                 break;
10810                         }
10811                 }
10812                 asoc->numduptsns = 0;
10813         }
10814         /*
10815          * now that the chunk is prepared queue it to the control chunk
10816          * queue.
10817          */
10818         if (type == SCTP_SELECTIVE_ACK) {
10819                 a_chk->send_size = (uint16_t)(sizeof(struct sctp_sack_chunk) +
10820                     (num_gap_blocks + num_nr_gap_blocks) * sizeof(struct sctp_gap_ack_block) +
10821                     num_dups * sizeof(int32_t));
10822                 SCTP_BUF_LEN(a_chk->data) = a_chk->send_size;
10823                 sack->sack.cum_tsn_ack = htonl(asoc->cumulative_tsn);
10824                 sack->sack.a_rwnd = htonl(asoc->my_rwnd);
10825                 sack->sack.num_gap_ack_blks = htons(num_gap_blocks);
10826                 sack->sack.num_dup_tsns = htons(num_dups);
10827                 sack->ch.chunk_type = type;
10828                 sack->ch.chunk_flags = flags;
10829                 sack->ch.chunk_length = htons(a_chk->send_size);
10830         } else {
10831                 a_chk->send_size = (uint16_t)(sizeof(struct sctp_nr_sack_chunk) +
10832                     (num_gap_blocks + num_nr_gap_blocks) * sizeof(struct sctp_gap_ack_block) +
10833                     num_dups * sizeof(int32_t));
10834                 SCTP_BUF_LEN(a_chk->data) = a_chk->send_size;
10835                 nr_sack->nr_sack.cum_tsn_ack = htonl(asoc->cumulative_tsn);
10836                 nr_sack->nr_sack.a_rwnd = htonl(asoc->my_rwnd);
10837                 nr_sack->nr_sack.num_gap_ack_blks = htons(num_gap_blocks);
10838                 nr_sack->nr_sack.num_nr_gap_ack_blks = htons(num_nr_gap_blocks);
10839                 nr_sack->nr_sack.num_dup_tsns = htons(num_dups);
10840                 nr_sack->nr_sack.reserved = 0;
10841                 nr_sack->ch.chunk_type = type;
10842                 nr_sack->ch.chunk_flags = flags;
10843                 nr_sack->ch.chunk_length = htons(a_chk->send_size);
10844         }
10845         TAILQ_INSERT_TAIL(&asoc->control_send_queue, a_chk, sctp_next);
10846         asoc->my_last_reported_rwnd = asoc->my_rwnd;
10847         asoc->ctrl_queue_cnt++;
10848         asoc->send_sack = 0;
10849         SCTP_STAT_INCR(sctps_sendsacks);
10850         return;
10851 }
10852
10853 void
10854 sctp_send_abort_tcb(struct sctp_tcb *stcb, struct mbuf *operr, int so_locked)
10855 {
10856         struct mbuf *m_abort, *m, *m_last;
10857         struct mbuf *m_out, *m_end = NULL;
10858         struct sctp_abort_chunk *abort;
10859         struct sctp_auth_chunk *auth = NULL;
10860         struct sctp_nets *net;
10861         uint32_t vtag;
10862         uint32_t auth_offset = 0;
10863         int error;
10864         uint16_t cause_len, chunk_len, padding_len;
10865
10866         SCTP_TCB_LOCK_ASSERT(stcb);
10867         /*-
10868          * Add an AUTH chunk, if chunk requires it and save the offset into
10869          * the chain for AUTH
10870          */
10871         if (sctp_auth_is_required_chunk(SCTP_ABORT_ASSOCIATION,
10872             stcb->asoc.peer_auth_chunks)) {
10873                 m_out = sctp_add_auth_chunk(NULL, &m_end, &auth, &auth_offset,
10874                     stcb, SCTP_ABORT_ASSOCIATION);
10875                 SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
10876         } else {
10877                 m_out = NULL;
10878         }
10879         m_abort = sctp_get_mbuf_for_msg(sizeof(struct sctp_abort_chunk), 0, M_NOWAIT, 1, MT_HEADER);
10880         if (m_abort == NULL) {
10881                 if (m_out) {
10882                         sctp_m_freem(m_out);
10883                 }
10884                 if (operr) {
10885                         sctp_m_freem(operr);
10886                 }
10887                 return;
10888         }
10889         /* link in any error */
10890         SCTP_BUF_NEXT(m_abort) = operr;
10891         cause_len = 0;
10892         m_last = NULL;
10893         for (m = operr; m; m = SCTP_BUF_NEXT(m)) {
10894                 cause_len += (uint16_t)SCTP_BUF_LEN(m);
10895                 if (SCTP_BUF_NEXT(m) == NULL) {
10896                         m_last = m;
10897                 }
10898         }
10899         SCTP_BUF_LEN(m_abort) = sizeof(struct sctp_abort_chunk);
10900         chunk_len = (uint16_t)sizeof(struct sctp_abort_chunk) + cause_len;
10901         padding_len = SCTP_SIZE32(chunk_len) - chunk_len;
10902         if (m_out == NULL) {
10903                 /* NO Auth chunk prepended, so reserve space in front */
10904                 SCTP_BUF_RESV_UF(m_abort, SCTP_MIN_OVERHEAD);
10905                 m_out = m_abort;
10906         } else {
10907                 /* Put AUTH chunk at the front of the chain */
10908                 SCTP_BUF_NEXT(m_end) = m_abort;
10909         }
10910         if (stcb->asoc.alternate) {
10911                 net = stcb->asoc.alternate;
10912         } else {
10913                 net = stcb->asoc.primary_destination;
10914         }
10915         /* Fill in the ABORT chunk header. */
10916         abort = mtod(m_abort, struct sctp_abort_chunk *);
10917         abort->ch.chunk_type = SCTP_ABORT_ASSOCIATION;
10918         if (stcb->asoc.peer_vtag == 0) {
10919                 /* This happens iff the assoc is in COOKIE-WAIT state. */
10920                 vtag = stcb->asoc.my_vtag;
10921                 abort->ch.chunk_flags = SCTP_HAD_NO_TCB;
10922         } else {
10923                 vtag = stcb->asoc.peer_vtag;
10924                 abort->ch.chunk_flags = 0;
10925         }
10926         abort->ch.chunk_length = htons(chunk_len);
10927         /* Add padding, if necessary. */
10928         if (padding_len > 0) {
10929                 if ((m_last == NULL) ||
10930                     (sctp_add_pad_tombuf(m_last, padding_len) == NULL)) {
10931                         sctp_m_freem(m_out);
10932                         return;
10933                 }
10934         }
10935         if ((error = sctp_lowlevel_chunk_output(stcb->sctp_ep, stcb, net,
10936             (struct sockaddr *)&net->ro._l_addr,
10937             m_out, auth_offset, auth, stcb->asoc.authinfo.active_keyid, 1, 0, 0,
10938             stcb->sctp_ep->sctp_lport, stcb->rport, htonl(vtag),
10939             stcb->asoc.primary_destination->port, NULL,
10940             0, 0,
10941             so_locked))) {
10942                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
10943                 if (error == ENOBUFS) {
10944                         stcb->asoc.ifp_had_enobuf = 1;
10945                         SCTP_STAT_INCR(sctps_lowlevelerr);
10946                 }
10947         } else {
10948                 stcb->asoc.ifp_had_enobuf = 0;
10949         }
10950         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
10951 }
10952
10953 void
10954 sctp_send_shutdown_complete(struct sctp_tcb *stcb,
10955     struct sctp_nets *net,
10956     int reflect_vtag)
10957 {
10958         /* formulate and SEND a SHUTDOWN-COMPLETE */
10959         struct mbuf *m_shutdown_comp;
10960         struct sctp_shutdown_complete_chunk *shutdown_complete;
10961         uint32_t vtag;
10962         int error;
10963         uint8_t flags;
10964
10965         m_shutdown_comp = sctp_get_mbuf_for_msg(sizeof(struct sctp_chunkhdr), 0, M_NOWAIT, 1, MT_HEADER);
10966         if (m_shutdown_comp == NULL) {
10967                 /* no mbuf's */
10968                 return;
10969         }
10970         if (reflect_vtag) {
10971                 flags = SCTP_HAD_NO_TCB;
10972                 vtag = stcb->asoc.my_vtag;
10973         } else {
10974                 flags = 0;
10975                 vtag = stcb->asoc.peer_vtag;
10976         }
10977         shutdown_complete = mtod(m_shutdown_comp, struct sctp_shutdown_complete_chunk *);
10978         shutdown_complete->ch.chunk_type = SCTP_SHUTDOWN_COMPLETE;
10979         shutdown_complete->ch.chunk_flags = flags;
10980         shutdown_complete->ch.chunk_length = htons(sizeof(struct sctp_shutdown_complete_chunk));
10981         SCTP_BUF_LEN(m_shutdown_comp) = sizeof(struct sctp_shutdown_complete_chunk);
10982         if ((error = sctp_lowlevel_chunk_output(stcb->sctp_ep, stcb, net,
10983             (struct sockaddr *)&net->ro._l_addr,
10984             m_shutdown_comp, 0, NULL, 0, 1, 0, 0,
10985             stcb->sctp_ep->sctp_lport, stcb->rport,
10986             htonl(vtag),
10987             net->port, NULL,
10988             0, 0,
10989             SCTP_SO_NOT_LOCKED))) {
10990                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
10991                 if (error == ENOBUFS) {
10992                         stcb->asoc.ifp_had_enobuf = 1;
10993                         SCTP_STAT_INCR(sctps_lowlevelerr);
10994                 }
10995         } else {
10996                 stcb->asoc.ifp_had_enobuf = 0;
10997         }
10998         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
10999         return;
11000 }
11001
11002 static void
11003 sctp_send_resp_msg(struct sockaddr *src, struct sockaddr *dst,
11004     struct sctphdr *sh, uint32_t vtag,
11005     uint8_t type, struct mbuf *cause,
11006     uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum,
11007     uint32_t vrf_id, uint16_t port)
11008 {
11009         struct mbuf *o_pak;
11010         struct mbuf *mout;
11011         struct sctphdr *shout;
11012         struct sctp_chunkhdr *ch;
11013 #if defined(INET) || defined(INET6)
11014         struct udphdr *udp;
11015 #endif
11016         int ret, len, cause_len, padding_len;
11017 #ifdef INET
11018         struct sockaddr_in *src_sin, *dst_sin;
11019         struct ip *ip;
11020 #endif
11021 #ifdef INET6
11022         struct sockaddr_in6 *src_sin6, *dst_sin6;
11023         struct ip6_hdr *ip6;
11024 #endif
11025
11026         /* Compute the length of the cause and add final padding. */
11027         cause_len = 0;
11028         if (cause != NULL) {
11029                 struct mbuf *m_at, *m_last = NULL;
11030
11031                 for (m_at = cause; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
11032                         if (SCTP_BUF_NEXT(m_at) == NULL)
11033                                 m_last = m_at;
11034                         cause_len += SCTP_BUF_LEN(m_at);
11035                 }
11036                 padding_len = cause_len % 4;
11037                 if (padding_len != 0) {
11038                         padding_len = 4 - padding_len;
11039                 }
11040                 if (padding_len != 0) {
11041                         if (sctp_add_pad_tombuf(m_last, padding_len) == NULL) {
11042                                 sctp_m_freem(cause);
11043                                 return;
11044                         }
11045                 }
11046         } else {
11047                 padding_len = 0;
11048         }
11049         /* Get an mbuf for the header. */
11050         len = sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
11051         switch (dst->sa_family) {
11052 #ifdef INET
11053         case AF_INET:
11054                 len += sizeof(struct ip);
11055                 break;
11056 #endif
11057 #ifdef INET6
11058         case AF_INET6:
11059                 len += sizeof(struct ip6_hdr);
11060                 break;
11061 #endif
11062         default:
11063                 break;
11064         }
11065 #if defined(INET) || defined(INET6)
11066         if (port) {
11067                 len += sizeof(struct udphdr);
11068         }
11069 #endif
11070         mout = sctp_get_mbuf_for_msg(len + max_linkhdr, 1, M_NOWAIT, 1, MT_DATA);
11071         if (mout == NULL) {
11072                 if (cause) {
11073                         sctp_m_freem(cause);
11074                 }
11075                 return;
11076         }
11077         SCTP_BUF_RESV_UF(mout, max_linkhdr);
11078         SCTP_BUF_LEN(mout) = len;
11079         SCTP_BUF_NEXT(mout) = cause;
11080         M_SETFIB(mout, fibnum);
11081         mout->m_pkthdr.flowid = mflowid;
11082         M_HASHTYPE_SET(mout, mflowtype);
11083 #ifdef INET
11084         ip = NULL;
11085 #endif
11086 #ifdef INET6
11087         ip6 = NULL;
11088 #endif
11089         switch (dst->sa_family) {
11090 #ifdef INET
11091         case AF_INET:
11092                 src_sin = (struct sockaddr_in *)src;
11093                 dst_sin = (struct sockaddr_in *)dst;
11094                 ip = mtod(mout, struct ip *);
11095                 ip->ip_v = IPVERSION;
11096                 ip->ip_hl = (sizeof(struct ip) >> 2);
11097                 ip->ip_tos = 0;
11098                 ip->ip_off = htons(IP_DF);
11099                 ip_fillid(ip);
11100                 ip->ip_ttl = MODULE_GLOBAL(ip_defttl);
11101                 if (port) {
11102                         ip->ip_p = IPPROTO_UDP;
11103                 } else {
11104                         ip->ip_p = IPPROTO_SCTP;
11105                 }
11106                 ip->ip_src.s_addr = dst_sin->sin_addr.s_addr;
11107                 ip->ip_dst.s_addr = src_sin->sin_addr.s_addr;
11108                 ip->ip_sum = 0;
11109                 len = sizeof(struct ip);
11110                 shout = (struct sctphdr *)((caddr_t)ip + len);
11111                 break;
11112 #endif
11113 #ifdef INET6
11114         case AF_INET6:
11115                 src_sin6 = (struct sockaddr_in6 *)src;
11116                 dst_sin6 = (struct sockaddr_in6 *)dst;
11117                 ip6 = mtod(mout, struct ip6_hdr *);
11118                 ip6->ip6_flow = htonl(0x60000000);
11119                 if (V_ip6_auto_flowlabel) {
11120                         ip6->ip6_flow |= (htonl(ip6_randomflowlabel()) & IPV6_FLOWLABEL_MASK);
11121                 }
11122                 ip6->ip6_hlim = MODULE_GLOBAL(ip6_defhlim);
11123                 if (port) {
11124                         ip6->ip6_nxt = IPPROTO_UDP;
11125                 } else {
11126                         ip6->ip6_nxt = IPPROTO_SCTP;
11127                 }
11128                 ip6->ip6_src = dst_sin6->sin6_addr;
11129                 ip6->ip6_dst = src_sin6->sin6_addr;
11130                 len = sizeof(struct ip6_hdr);
11131                 shout = (struct sctphdr *)((caddr_t)ip6 + len);
11132                 break;
11133 #endif
11134         default:
11135                 len = 0;
11136                 shout = mtod(mout, struct sctphdr *);
11137                 break;
11138         }
11139 #if defined(INET) || defined(INET6)
11140         if (port) {
11141                 if (htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port)) == 0) {
11142                         sctp_m_freem(mout);
11143                         return;
11144                 }
11145                 udp = (struct udphdr *)shout;
11146                 udp->uh_sport = htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port));
11147                 udp->uh_dport = port;
11148                 udp->uh_sum = 0;
11149                 udp->uh_ulen = htons((uint16_t)(sizeof(struct udphdr) +
11150                     sizeof(struct sctphdr) +
11151                     sizeof(struct sctp_chunkhdr) +
11152                     cause_len + padding_len));
11153                 len += sizeof(struct udphdr);
11154                 shout = (struct sctphdr *)((caddr_t)shout + sizeof(struct udphdr));
11155         } else {
11156                 udp = NULL;
11157         }
11158 #endif
11159         shout->src_port = sh->dest_port;
11160         shout->dest_port = sh->src_port;
11161         shout->checksum = 0;
11162         if (vtag) {
11163                 shout->v_tag = htonl(vtag);
11164         } else {
11165                 shout->v_tag = sh->v_tag;
11166         }
11167         len += sizeof(struct sctphdr);
11168         ch = (struct sctp_chunkhdr *)((caddr_t)shout + sizeof(struct sctphdr));
11169         ch->chunk_type = type;
11170         if (vtag) {
11171                 ch->chunk_flags = 0;
11172         } else {
11173                 ch->chunk_flags = SCTP_HAD_NO_TCB;
11174         }
11175         ch->chunk_length = htons((uint16_t)(sizeof(struct sctp_chunkhdr) + cause_len));
11176         len += sizeof(struct sctp_chunkhdr);
11177         len += cause_len + padding_len;
11178
11179         if (SCTP_GET_HEADER_FOR_OUTPUT(o_pak)) {
11180                 sctp_m_freem(mout);
11181                 return;
11182         }
11183         SCTP_ATTACH_CHAIN(o_pak, mout, len);
11184         switch (dst->sa_family) {
11185 #ifdef INET
11186         case AF_INET:
11187                 if (port) {
11188                         if (V_udp_cksum) {
11189                                 udp->uh_sum = in_pseudo(ip->ip_src.s_addr, ip->ip_dst.s_addr, udp->uh_ulen + htons(IPPROTO_UDP));
11190                         } else {
11191                                 udp->uh_sum = 0;
11192                         }
11193                 }
11194                 ip->ip_len = htons(len);
11195                 if (port) {
11196                         shout->checksum = sctp_calculate_cksum(mout, sizeof(struct ip) + sizeof(struct udphdr));
11197                         SCTP_STAT_INCR(sctps_sendswcrc);
11198                         if (V_udp_cksum) {
11199                                 SCTP_ENABLE_UDP_CSUM(o_pak);
11200                         }
11201                 } else {
11202                         mout->m_pkthdr.csum_flags = CSUM_SCTP;
11203                         mout->m_pkthdr.csum_data = offsetof(struct sctphdr, checksum);
11204                         SCTP_STAT_INCR(sctps_sendhwcrc);
11205                 }
11206 #ifdef SCTP_PACKET_LOGGING
11207                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING) {
11208                         sctp_packet_log(o_pak);
11209                 }
11210 #endif
11211                 SCTP_PROBE5(send, NULL, NULL, ip, NULL, shout);
11212                 SCTP_IP_OUTPUT(ret, o_pak, NULL, NULL, vrf_id);
11213                 break;
11214 #endif
11215 #ifdef INET6
11216         case AF_INET6:
11217                 ip6->ip6_plen = htons((uint16_t)(len - sizeof(struct ip6_hdr)));
11218                 if (port) {
11219                         shout->checksum = sctp_calculate_cksum(mout, sizeof(struct ip6_hdr) + sizeof(struct udphdr));
11220                         SCTP_STAT_INCR(sctps_sendswcrc);
11221                         if ((udp->uh_sum = in6_cksum(o_pak, IPPROTO_UDP, sizeof(struct ip6_hdr), len - sizeof(struct ip6_hdr))) == 0) {
11222                                 udp->uh_sum = 0xffff;
11223                         }
11224                 } else {
11225                         mout->m_pkthdr.csum_flags = CSUM_SCTP_IPV6;
11226                         mout->m_pkthdr.csum_data = offsetof(struct sctphdr, checksum);
11227                         SCTP_STAT_INCR(sctps_sendhwcrc);
11228                 }
11229 #ifdef SCTP_PACKET_LOGGING
11230                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING) {
11231                         sctp_packet_log(o_pak);
11232                 }
11233 #endif
11234                 SCTP_PROBE5(send, NULL, NULL, ip6, NULL, shout);
11235                 SCTP_IP6_OUTPUT(ret, o_pak, NULL, NULL, NULL, vrf_id);
11236                 break;
11237 #endif
11238         default:
11239                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Unknown protocol (TSNH) type %d\n",
11240                     dst->sa_family);
11241                 sctp_m_freem(mout);
11242                 SCTP_LTRACE_ERR_RET_PKT(mout, NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EFAULT);
11243                 return;
11244         }
11245         SCTPDBG(SCTP_DEBUG_OUTPUT3, "return from send is %d\n", ret);
11246         if (port) {
11247                 UDPSTAT_INC(udps_opackets);
11248         }
11249         SCTP_STAT_INCR(sctps_sendpackets);
11250         SCTP_STAT_INCR_COUNTER64(sctps_outpackets);
11251         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
11252         if (ret) {
11253                 SCTP_STAT_INCR(sctps_senderrors);
11254         }
11255         return;
11256 }
11257
11258 void
11259 sctp_send_shutdown_complete2(struct sockaddr *src, struct sockaddr *dst,
11260     struct sctphdr *sh,
11261     uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum,
11262     uint32_t vrf_id, uint16_t port)
11263 {
11264         sctp_send_resp_msg(src, dst, sh, 0, SCTP_SHUTDOWN_COMPLETE, NULL,
11265             mflowtype, mflowid, fibnum,
11266             vrf_id, port);
11267 }
11268
11269 void
11270 sctp_send_hb(struct sctp_tcb *stcb, struct sctp_nets *net, int so_locked)
11271 {
11272         struct sctp_tmit_chunk *chk;
11273         struct sctp_heartbeat_chunk *hb;
11274         struct timeval now;
11275
11276         SCTP_TCB_LOCK_ASSERT(stcb);
11277         if (net == NULL) {
11278                 return;
11279         }
11280         (void)SCTP_GETTIME_TIMEVAL(&now);
11281         switch (net->ro._l_addr.sa.sa_family) {
11282 #ifdef INET
11283         case AF_INET:
11284                 break;
11285 #endif
11286 #ifdef INET6
11287         case AF_INET6:
11288                 break;
11289 #endif
11290         default:
11291                 return;
11292         }
11293         sctp_alloc_a_chunk(stcb, chk);
11294         if (chk == NULL) {
11295                 SCTPDBG(SCTP_DEBUG_OUTPUT4, "Gak, can't get a chunk for hb\n");
11296                 return;
11297         }
11298
11299         chk->copy_by_ref = 0;
11300         chk->rec.chunk_id.id = SCTP_HEARTBEAT_REQUEST;
11301         chk->rec.chunk_id.can_take_data = 1;
11302         chk->flags = 0;
11303         chk->asoc = &stcb->asoc;
11304         chk->send_size = sizeof(struct sctp_heartbeat_chunk);
11305
11306         chk->data = sctp_get_mbuf_for_msg(chk->send_size, 0, M_NOWAIT, 1, MT_HEADER);
11307         if (chk->data == NULL) {
11308                 sctp_free_a_chunk(stcb, chk, so_locked);
11309                 return;
11310         }
11311         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11312         SCTP_BUF_LEN(chk->data) = chk->send_size;
11313         chk->sent = SCTP_DATAGRAM_UNSENT;
11314         chk->snd_count = 0;
11315         chk->whoTo = net;
11316         atomic_add_int(&chk->whoTo->ref_count, 1);
11317         /* Now we have a mbuf that we can fill in with the details */
11318         hb = mtod(chk->data, struct sctp_heartbeat_chunk *);
11319         memset(hb, 0, sizeof(struct sctp_heartbeat_chunk));
11320         /* fill out chunk header */
11321         hb->ch.chunk_type = SCTP_HEARTBEAT_REQUEST;
11322         hb->ch.chunk_flags = 0;
11323         hb->ch.chunk_length = htons(chk->send_size);
11324         /* Fill out hb parameter */
11325         hb->heartbeat.hb_info.ph.param_type = htons(SCTP_HEARTBEAT_INFO);
11326         hb->heartbeat.hb_info.ph.param_length = htons(sizeof(struct sctp_heartbeat_info_param));
11327         hb->heartbeat.hb_info.time_value_1 = now.tv_sec;
11328         hb->heartbeat.hb_info.time_value_2 = now.tv_usec;
11329         /* Did our user request this one, put it in */
11330         hb->heartbeat.hb_info.addr_family = (uint8_t)net->ro._l_addr.sa.sa_family;
11331         hb->heartbeat.hb_info.addr_len = net->ro._l_addr.sa.sa_len;
11332         if (net->dest_state & SCTP_ADDR_UNCONFIRMED) {
11333                 /*
11334                  * we only take from the entropy pool if the address is not
11335                  * confirmed.
11336                  */
11337                 net->heartbeat_random1 = hb->heartbeat.hb_info.random_value1 = sctp_select_initial_TSN(&stcb->sctp_ep->sctp_ep);
11338                 net->heartbeat_random2 = hb->heartbeat.hb_info.random_value2 = sctp_select_initial_TSN(&stcb->sctp_ep->sctp_ep);
11339         } else {
11340                 net->heartbeat_random1 = hb->heartbeat.hb_info.random_value1 = 0;
11341                 net->heartbeat_random2 = hb->heartbeat.hb_info.random_value2 = 0;
11342         }
11343         switch (net->ro._l_addr.sa.sa_family) {
11344 #ifdef INET
11345         case AF_INET:
11346                 memcpy(hb->heartbeat.hb_info.address,
11347                     &net->ro._l_addr.sin.sin_addr,
11348                     sizeof(net->ro._l_addr.sin.sin_addr));
11349                 break;
11350 #endif
11351 #ifdef INET6
11352         case AF_INET6:
11353                 memcpy(hb->heartbeat.hb_info.address,
11354                     &net->ro._l_addr.sin6.sin6_addr,
11355                     sizeof(net->ro._l_addr.sin6.sin6_addr));
11356                 break;
11357 #endif
11358         default:
11359                 if (chk->data) {
11360                         sctp_m_freem(chk->data);
11361                         chk->data = NULL;
11362                 }
11363                 sctp_free_a_chunk(stcb, chk, so_locked);
11364                 return;
11365                 break;
11366         }
11367         net->hb_responded = 0;
11368         TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
11369         stcb->asoc.ctrl_queue_cnt++;
11370         SCTP_STAT_INCR(sctps_sendheartbeat);
11371         return;
11372 }
11373
11374 void
11375 sctp_send_ecn_echo(struct sctp_tcb *stcb, struct sctp_nets *net,
11376     uint32_t high_tsn)
11377 {
11378         struct sctp_association *asoc;
11379         struct sctp_ecne_chunk *ecne;
11380         struct sctp_tmit_chunk *chk;
11381
11382         if (net == NULL) {
11383                 return;
11384         }
11385         asoc = &stcb->asoc;
11386         SCTP_TCB_LOCK_ASSERT(stcb);
11387         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
11388                 if ((chk->rec.chunk_id.id == SCTP_ECN_ECHO) && (net == chk->whoTo)) {
11389                         /* found a previous ECN_ECHO update it if needed */
11390                         uint32_t cnt, ctsn;
11391
11392                         ecne = mtod(chk->data, struct sctp_ecne_chunk *);
11393                         ctsn = ntohl(ecne->tsn);
11394                         if (SCTP_TSN_GT(high_tsn, ctsn)) {
11395                                 ecne->tsn = htonl(high_tsn);
11396                                 SCTP_STAT_INCR(sctps_queue_upd_ecne);
11397                         }
11398                         cnt = ntohl(ecne->num_pkts_since_cwr);
11399                         cnt++;
11400                         ecne->num_pkts_since_cwr = htonl(cnt);
11401                         return;
11402                 }
11403         }
11404         /* nope could not find one to update so we must build one */
11405         sctp_alloc_a_chunk(stcb, chk);
11406         if (chk == NULL) {
11407                 return;
11408         }
11409         SCTP_STAT_INCR(sctps_queue_upd_ecne);
11410         chk->copy_by_ref = 0;
11411         chk->rec.chunk_id.id = SCTP_ECN_ECHO;
11412         chk->rec.chunk_id.can_take_data = 0;
11413         chk->flags = 0;
11414         chk->asoc = &stcb->asoc;
11415         chk->send_size = sizeof(struct sctp_ecne_chunk);
11416         chk->data = sctp_get_mbuf_for_msg(chk->send_size, 0, M_NOWAIT, 1, MT_HEADER);
11417         if (chk->data == NULL) {
11418                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
11419                 return;
11420         }
11421         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11422         SCTP_BUF_LEN(chk->data) = chk->send_size;
11423         chk->sent = SCTP_DATAGRAM_UNSENT;
11424         chk->snd_count = 0;
11425         chk->whoTo = net;
11426         atomic_add_int(&chk->whoTo->ref_count, 1);
11427
11428         stcb->asoc.ecn_echo_cnt_onq++;
11429         ecne = mtod(chk->data, struct sctp_ecne_chunk *);
11430         ecne->ch.chunk_type = SCTP_ECN_ECHO;
11431         ecne->ch.chunk_flags = 0;
11432         ecne->ch.chunk_length = htons(sizeof(struct sctp_ecne_chunk));
11433         ecne->tsn = htonl(high_tsn);
11434         ecne->num_pkts_since_cwr = htonl(1);
11435         TAILQ_INSERT_HEAD(&stcb->asoc.control_send_queue, chk, sctp_next);
11436         asoc->ctrl_queue_cnt++;
11437 }
11438
11439 void
11440 sctp_send_packet_dropped(struct sctp_tcb *stcb, struct sctp_nets *net,
11441     struct mbuf *m, int len, int iphlen, int bad_crc)
11442 {
11443         struct sctp_association *asoc;
11444         struct sctp_pktdrop_chunk *drp;
11445         struct sctp_tmit_chunk *chk;
11446         uint8_t *datap;
11447         int was_trunc = 0;
11448         int fullsz = 0;
11449         long spc;
11450         int offset;
11451         struct sctp_chunkhdr *ch, chunk_buf;
11452         unsigned int chk_length;
11453
11454         if (!stcb) {
11455                 return;
11456         }
11457         asoc = &stcb->asoc;
11458         SCTP_TCB_LOCK_ASSERT(stcb);
11459         if (asoc->pktdrop_supported == 0) {
11460                 /*-
11461                  * peer must declare support before I send one.
11462                  */
11463                 return;
11464         }
11465         if (stcb->sctp_socket == NULL) {
11466                 return;
11467         }
11468         sctp_alloc_a_chunk(stcb, chk);
11469         if (chk == NULL) {
11470                 return;
11471         }
11472         chk->copy_by_ref = 0;
11473         chk->rec.chunk_id.id = SCTP_PACKET_DROPPED;
11474         chk->rec.chunk_id.can_take_data = 1;
11475         chk->flags = 0;
11476         len -= iphlen;
11477         chk->send_size = len;
11478         /* Validate that we do not have an ABORT in here. */
11479         offset = iphlen + sizeof(struct sctphdr);
11480         ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, offset,
11481             sizeof(*ch), (uint8_t *)&chunk_buf);
11482         while (ch != NULL) {
11483                 chk_length = ntohs(ch->chunk_length);
11484                 if (chk_length < sizeof(*ch)) {
11485                         /* break to abort land */
11486                         break;
11487                 }
11488                 switch (ch->chunk_type) {
11489                 case SCTP_PACKET_DROPPED:
11490                 case SCTP_ABORT_ASSOCIATION:
11491                 case SCTP_INITIATION_ACK:
11492                         /**
11493                          * We don't respond with an PKT-DROP to an ABORT
11494                          * or PKT-DROP. We also do not respond to an
11495                          * INIT-ACK, because we can't know if the initiation
11496                          * tag is correct or not.
11497                          */
11498                         sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
11499                         return;
11500                 default:
11501                         break;
11502                 }
11503                 offset += SCTP_SIZE32(chk_length);
11504                 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, offset,
11505                     sizeof(*ch), (uint8_t *)&chunk_buf);
11506         }
11507
11508         if ((len + SCTP_MAX_OVERHEAD + sizeof(struct sctp_pktdrop_chunk)) >
11509             min(stcb->asoc.smallest_mtu, MCLBYTES)) {
11510                 /*
11511                  * only send 1 mtu worth, trim off the excess on the end.
11512                  */
11513                 fullsz = len;
11514                 len = min(stcb->asoc.smallest_mtu, MCLBYTES) - SCTP_MAX_OVERHEAD;
11515                 was_trunc = 1;
11516         }
11517         chk->asoc = &stcb->asoc;
11518         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
11519         if (chk->data == NULL) {
11520 jump_out:
11521                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
11522                 return;
11523         }
11524         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11525         drp = mtod(chk->data, struct sctp_pktdrop_chunk *);
11526         if (drp == NULL) {
11527                 sctp_m_freem(chk->data);
11528                 chk->data = NULL;
11529                 goto jump_out;
11530         }
11531         chk->book_size = SCTP_SIZE32((chk->send_size + sizeof(struct sctp_pktdrop_chunk) +
11532             sizeof(struct sctphdr) + SCTP_MED_OVERHEAD));
11533         chk->book_size_scale = 0;
11534         if (was_trunc) {
11535                 drp->ch.chunk_flags = SCTP_PACKET_TRUNCATED;
11536                 drp->trunc_len = htons(fullsz);
11537                 /*
11538                  * Len is already adjusted to size minus overhead above take
11539                  * out the pkt_drop chunk itself from it.
11540                  */
11541                 chk->send_size = (uint16_t)(len - sizeof(struct sctp_pktdrop_chunk));
11542                 len = chk->send_size;
11543         } else {
11544                 /* no truncation needed */
11545                 drp->ch.chunk_flags = 0;
11546                 drp->trunc_len = htons(0);
11547         }
11548         if (bad_crc) {
11549                 drp->ch.chunk_flags |= SCTP_BADCRC;
11550         }
11551         chk->send_size += sizeof(struct sctp_pktdrop_chunk);
11552         SCTP_BUF_LEN(chk->data) = chk->send_size;
11553         chk->sent = SCTP_DATAGRAM_UNSENT;
11554         chk->snd_count = 0;
11555         if (net) {
11556                 /* we should hit here */
11557                 chk->whoTo = net;
11558                 atomic_add_int(&chk->whoTo->ref_count, 1);
11559         } else {
11560                 chk->whoTo = NULL;
11561         }
11562         drp->ch.chunk_type = SCTP_PACKET_DROPPED;
11563         drp->ch.chunk_length = htons(chk->send_size);
11564         spc = SCTP_SB_LIMIT_RCV(stcb->sctp_socket);
11565         if (spc < 0) {
11566                 spc = 0;
11567         }
11568         drp->bottle_bw = htonl(spc);
11569         if (asoc->my_rwnd) {
11570                 drp->current_onq = htonl(asoc->size_on_reasm_queue +
11571                     asoc->size_on_all_streams +
11572                     asoc->my_rwnd_control_len +
11573                     stcb->sctp_socket->so_rcv.sb_cc);
11574         } else {
11575                 /*-
11576                  * If my rwnd is 0, possibly from mbuf depletion as well as
11577                  * space used, tell the peer there is NO space aka onq == bw
11578                  */
11579                 drp->current_onq = htonl(spc);
11580         }
11581         drp->reserved = 0;
11582         datap = drp->data;
11583         m_copydata(m, iphlen, len, (caddr_t)datap);
11584         TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
11585         asoc->ctrl_queue_cnt++;
11586 }
11587
11588 void
11589 sctp_send_cwr(struct sctp_tcb *stcb, struct sctp_nets *net, uint32_t high_tsn, uint8_t override)
11590 {
11591         struct sctp_association *asoc;
11592         struct sctp_cwr_chunk *cwr;
11593         struct sctp_tmit_chunk *chk;
11594
11595         SCTP_TCB_LOCK_ASSERT(stcb);
11596         if (net == NULL) {
11597                 return;
11598         }
11599         asoc = &stcb->asoc;
11600         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
11601                 if ((chk->rec.chunk_id.id == SCTP_ECN_CWR) && (net == chk->whoTo)) {
11602                         /*
11603                          * found a previous CWR queued to same destination
11604                          * update it if needed
11605                          */
11606                         uint32_t ctsn;
11607
11608                         cwr = mtod(chk->data, struct sctp_cwr_chunk *);
11609                         ctsn = ntohl(cwr->tsn);
11610                         if (SCTP_TSN_GT(high_tsn, ctsn)) {
11611                                 cwr->tsn = htonl(high_tsn);
11612                         }
11613                         if (override & SCTP_CWR_REDUCE_OVERRIDE) {
11614                                 /* Make sure override is carried */
11615                                 cwr->ch.chunk_flags |= SCTP_CWR_REDUCE_OVERRIDE;
11616                         }
11617                         return;
11618                 }
11619         }
11620         sctp_alloc_a_chunk(stcb, chk);
11621         if (chk == NULL) {
11622                 return;
11623         }
11624         chk->copy_by_ref = 0;
11625         chk->rec.chunk_id.id = SCTP_ECN_CWR;
11626         chk->rec.chunk_id.can_take_data = 1;
11627         chk->flags = 0;
11628         chk->asoc = &stcb->asoc;
11629         chk->send_size = sizeof(struct sctp_cwr_chunk);
11630         chk->data = sctp_get_mbuf_for_msg(chk->send_size, 0, M_NOWAIT, 1, MT_HEADER);
11631         if (chk->data == NULL) {
11632                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
11633                 return;
11634         }
11635         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11636         SCTP_BUF_LEN(chk->data) = chk->send_size;
11637         chk->sent = SCTP_DATAGRAM_UNSENT;
11638         chk->snd_count = 0;
11639         chk->whoTo = net;
11640         atomic_add_int(&chk->whoTo->ref_count, 1);
11641         cwr = mtod(chk->data, struct sctp_cwr_chunk *);
11642         cwr->ch.chunk_type = SCTP_ECN_CWR;
11643         cwr->ch.chunk_flags = override;
11644         cwr->ch.chunk_length = htons(sizeof(struct sctp_cwr_chunk));
11645         cwr->tsn = htonl(high_tsn);
11646         TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
11647         asoc->ctrl_queue_cnt++;
11648 }
11649
11650 static int
11651 sctp_add_stream_reset_out(struct sctp_tcb *stcb, struct sctp_tmit_chunk *chk,
11652     uint32_t seq, uint32_t resp_seq, uint32_t last_sent)
11653 {
11654         uint16_t len, old_len, i;
11655         struct sctp_stream_reset_out_request *req_out;
11656         struct sctp_chunkhdr *ch;
11657         int at;
11658         int number_entries = 0;
11659
11660         ch = mtod(chk->data, struct sctp_chunkhdr *);
11661         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11662         /* get to new offset for the param. */
11663         req_out = (struct sctp_stream_reset_out_request *)((caddr_t)ch + len);
11664         /* now how long will this param be? */
11665         for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
11666                 if ((stcb->asoc.strmout[i].state == SCTP_STREAM_RESET_PENDING) &&
11667                     (stcb->asoc.strmout[i].chunks_on_queues == 0) &&
11668                     TAILQ_EMPTY(&stcb->asoc.strmout[i].outqueue)) {
11669                         number_entries++;
11670                 }
11671         }
11672         if (number_entries == 0) {
11673                 return (0);
11674         }
11675         if (number_entries == stcb->asoc.streamoutcnt) {
11676                 number_entries = 0;
11677         }
11678         if (number_entries > SCTP_MAX_STREAMS_AT_ONCE_RESET) {
11679                 number_entries = SCTP_MAX_STREAMS_AT_ONCE_RESET;
11680         }
11681         len = (uint16_t)(sizeof(struct sctp_stream_reset_out_request) + (sizeof(uint16_t) * number_entries));
11682         req_out->ph.param_type = htons(SCTP_STR_RESET_OUT_REQUEST);
11683         req_out->ph.param_length = htons(len);
11684         req_out->request_seq = htonl(seq);
11685         req_out->response_seq = htonl(resp_seq);
11686         req_out->send_reset_at_tsn = htonl(last_sent);
11687         at = 0;
11688         if (number_entries) {
11689                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
11690                         if ((stcb->asoc.strmout[i].state == SCTP_STREAM_RESET_PENDING) &&
11691                             (stcb->asoc.strmout[i].chunks_on_queues == 0) &&
11692                             TAILQ_EMPTY(&stcb->asoc.strmout[i].outqueue)) {
11693                                 req_out->list_of_streams[at] = htons(i);
11694                                 at++;
11695                                 stcb->asoc.strmout[i].state = SCTP_STREAM_RESET_IN_FLIGHT;
11696                                 if (at >= number_entries) {
11697                                         break;
11698                                 }
11699                         }
11700                 }
11701         } else {
11702                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
11703                         stcb->asoc.strmout[i].state = SCTP_STREAM_RESET_IN_FLIGHT;
11704                 }
11705         }
11706         if (SCTP_SIZE32(len) > len) {
11707                 /*-
11708                  * Need to worry about the pad we may end up adding to the
11709                  * end. This is easy since the struct is either aligned to 4
11710                  * bytes or 2 bytes off.
11711                  */
11712                 req_out->list_of_streams[number_entries] = 0;
11713         }
11714         /* now fix the chunk length */
11715         ch->chunk_length = htons(len + old_len);
11716         chk->book_size = len + old_len;
11717         chk->book_size_scale = 0;
11718         chk->send_size = SCTP_SIZE32(chk->book_size);
11719         SCTP_BUF_LEN(chk->data) = chk->send_size;
11720         return (1);
11721 }
11722
11723 static void
11724 sctp_add_stream_reset_in(struct sctp_tmit_chunk *chk,
11725     int number_entries, uint16_t *list,
11726     uint32_t seq)
11727 {
11728         uint16_t len, old_len, i;
11729         struct sctp_stream_reset_in_request *req_in;
11730         struct sctp_chunkhdr *ch;
11731
11732         ch = mtod(chk->data, struct sctp_chunkhdr *);
11733         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11734
11735         /* get to new offset for the param. */
11736         req_in = (struct sctp_stream_reset_in_request *)((caddr_t)ch + len);
11737         /* now how long will this param be? */
11738         len = (uint16_t)(sizeof(struct sctp_stream_reset_in_request) + (sizeof(uint16_t) * number_entries));
11739         req_in->ph.param_type = htons(SCTP_STR_RESET_IN_REQUEST);
11740         req_in->ph.param_length = htons(len);
11741         req_in->request_seq = htonl(seq);
11742         if (number_entries) {
11743                 for (i = 0; i < number_entries; i++) {
11744                         req_in->list_of_streams[i] = htons(list[i]);
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_in->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;
11762 }
11763
11764 static void
11765 sctp_add_stream_reset_tsn(struct sctp_tmit_chunk *chk,
11766     uint32_t seq)
11767 {
11768         uint16_t len, old_len;
11769         struct sctp_stream_reset_tsn_request *req_tsn;
11770         struct sctp_chunkhdr *ch;
11771
11772         ch = mtod(chk->data, struct sctp_chunkhdr *);
11773         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11774
11775         /* get to new offset for the param. */
11776         req_tsn = (struct sctp_stream_reset_tsn_request *)((caddr_t)ch + len);
11777         /* now how long will this param be? */
11778         len = sizeof(struct sctp_stream_reset_tsn_request);
11779         req_tsn->ph.param_type = htons(SCTP_STR_RESET_TSN_REQUEST);
11780         req_tsn->ph.param_length = htons(len);
11781         req_tsn->request_seq = htonl(seq);
11782
11783         /* now fix the chunk length */
11784         ch->chunk_length = htons(len + old_len);
11785         chk->send_size = len + old_len;
11786         chk->book_size = SCTP_SIZE32(chk->send_size);
11787         chk->book_size_scale = 0;
11788         SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size);
11789         return;
11790 }
11791
11792 void
11793 sctp_add_stream_reset_result(struct sctp_tmit_chunk *chk,
11794     uint32_t resp_seq, uint32_t result)
11795 {
11796         uint16_t len, old_len;
11797         struct sctp_stream_reset_response *resp;
11798         struct sctp_chunkhdr *ch;
11799
11800         ch = mtod(chk->data, struct sctp_chunkhdr *);
11801         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11802
11803         /* get to new offset for the param. */
11804         resp = (struct sctp_stream_reset_response *)((caddr_t)ch + len);
11805         /* now how long will this param be? */
11806         len = sizeof(struct sctp_stream_reset_response);
11807         resp->ph.param_type = htons(SCTP_STR_RESET_RESPONSE);
11808         resp->ph.param_length = htons(len);
11809         resp->response_seq = htonl(resp_seq);
11810         resp->result = ntohl(result);
11811
11812         /* now fix the chunk length */
11813         ch->chunk_length = htons(len + old_len);
11814         chk->book_size = len + old_len;
11815         chk->book_size_scale = 0;
11816         chk->send_size = SCTP_SIZE32(chk->book_size);
11817         SCTP_BUF_LEN(chk->data) = chk->send_size;
11818         return;
11819 }
11820
11821 void
11822 sctp_send_deferred_reset_response(struct sctp_tcb *stcb,
11823     struct sctp_stream_reset_list *ent,
11824     int response)
11825 {
11826         struct sctp_association *asoc;
11827         struct sctp_tmit_chunk *chk;
11828         struct sctp_chunkhdr *ch;
11829
11830         asoc = &stcb->asoc;
11831
11832         /*
11833          * Reset our last reset action to the new one IP -> response
11834          * (PERFORMED probably). This assures that if we fail to send, a
11835          * retran from the peer will get the new response.
11836          */
11837         asoc->last_reset_action[0] = response;
11838         if (asoc->stream_reset_outstanding) {
11839                 return;
11840         }
11841         sctp_alloc_a_chunk(stcb, chk);
11842         if (chk == NULL) {
11843                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
11844                 return;
11845         }
11846         chk->copy_by_ref = 0;
11847         chk->rec.chunk_id.id = SCTP_STREAM_RESET;
11848         chk->rec.chunk_id.can_take_data = 0;
11849         chk->flags = 0;
11850         chk->asoc = &stcb->asoc;
11851         chk->book_size = sizeof(struct sctp_chunkhdr);
11852         chk->send_size = SCTP_SIZE32(chk->book_size);
11853         chk->book_size_scale = 0;
11854         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
11855         if (chk->data == NULL) {
11856                 sctp_free_a_chunk(stcb, chk, SCTP_SO_LOCKED);
11857                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
11858                 return;
11859         }
11860         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11861         /* setup chunk parameters */
11862         chk->sent = SCTP_DATAGRAM_UNSENT;
11863         chk->snd_count = 0;
11864         if (stcb->asoc.alternate) {
11865                 chk->whoTo = stcb->asoc.alternate;
11866         } else {
11867                 chk->whoTo = stcb->asoc.primary_destination;
11868         }
11869         ch = mtod(chk->data, struct sctp_chunkhdr *);
11870         ch->chunk_type = SCTP_STREAM_RESET;
11871         ch->chunk_flags = 0;
11872         ch->chunk_length = htons(chk->book_size);
11873         atomic_add_int(&chk->whoTo->ref_count, 1);
11874         SCTP_BUF_LEN(chk->data) = chk->send_size;
11875         sctp_add_stream_reset_result(chk, ent->seq, response);
11876         /* insert the chunk for sending */
11877         TAILQ_INSERT_TAIL(&asoc->control_send_queue,
11878             chk,
11879             sctp_next);
11880         asoc->ctrl_queue_cnt++;
11881 }
11882
11883 void
11884 sctp_add_stream_reset_result_tsn(struct sctp_tmit_chunk *chk,
11885     uint32_t resp_seq, uint32_t result,
11886     uint32_t send_una, uint32_t recv_next)
11887 {
11888         uint16_t len, old_len;
11889         struct sctp_stream_reset_response_tsn *resp;
11890         struct sctp_chunkhdr *ch;
11891
11892         ch = mtod(chk->data, struct sctp_chunkhdr *);
11893         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11894
11895         /* get to new offset for the param. */
11896         resp = (struct sctp_stream_reset_response_tsn *)((caddr_t)ch + len);
11897         /* now how long will this param be? */
11898         len = sizeof(struct sctp_stream_reset_response_tsn);
11899         resp->ph.param_type = htons(SCTP_STR_RESET_RESPONSE);
11900         resp->ph.param_length = htons(len);
11901         resp->response_seq = htonl(resp_seq);
11902         resp->result = htonl(result);
11903         resp->senders_next_tsn = htonl(send_una);
11904         resp->receivers_next_tsn = htonl(recv_next);
11905
11906         /* now fix the chunk length */
11907         ch->chunk_length = htons(len + old_len);
11908         chk->book_size = len + old_len;
11909         chk->send_size = SCTP_SIZE32(chk->book_size);
11910         chk->book_size_scale = 0;
11911         SCTP_BUF_LEN(chk->data) = chk->send_size;
11912         return;
11913 }
11914
11915 static void
11916 sctp_add_an_out_stream(struct sctp_tmit_chunk *chk,
11917     uint32_t seq,
11918     uint16_t adding)
11919 {
11920         uint16_t len, old_len;
11921         struct sctp_chunkhdr *ch;
11922         struct sctp_stream_reset_add_strm *addstr;
11923
11924         ch = mtod(chk->data, struct sctp_chunkhdr *);
11925         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11926
11927         /* get to new offset for the param. */
11928         addstr = (struct sctp_stream_reset_add_strm *)((caddr_t)ch + len);
11929         /* now how long will this param be? */
11930         len = sizeof(struct sctp_stream_reset_add_strm);
11931
11932         /* Fill it out. */
11933         addstr->ph.param_type = htons(SCTP_STR_RESET_ADD_OUT_STREAMS);
11934         addstr->ph.param_length = htons(len);
11935         addstr->request_seq = htonl(seq);
11936         addstr->number_of_streams = htons(adding);
11937         addstr->reserved = 0;
11938
11939         /* now fix the chunk length */
11940         ch->chunk_length = htons(len + old_len);
11941         chk->send_size = len + old_len;
11942         chk->book_size = SCTP_SIZE32(chk->send_size);
11943         chk->book_size_scale = 0;
11944         SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size);
11945         return;
11946 }
11947
11948 static void
11949 sctp_add_an_in_stream(struct sctp_tmit_chunk *chk,
11950     uint32_t seq,
11951     uint16_t adding)
11952 {
11953         uint16_t len, old_len;
11954         struct sctp_chunkhdr *ch;
11955         struct sctp_stream_reset_add_strm *addstr;
11956
11957         ch = mtod(chk->data, struct sctp_chunkhdr *);
11958         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11959
11960         /* get to new offset for the param. */
11961         addstr = (struct sctp_stream_reset_add_strm *)((caddr_t)ch + len);
11962         /* now how long will this param be? */
11963         len = sizeof(struct sctp_stream_reset_add_strm);
11964         /* Fill it out. */
11965         addstr->ph.param_type = htons(SCTP_STR_RESET_ADD_IN_STREAMS);
11966         addstr->ph.param_length = htons(len);
11967         addstr->request_seq = htonl(seq);
11968         addstr->number_of_streams = htons(adding);
11969         addstr->reserved = 0;
11970
11971         /* now fix the chunk length */
11972         ch->chunk_length = htons(len + old_len);
11973         chk->send_size = len + old_len;
11974         chk->book_size = SCTP_SIZE32(chk->send_size);
11975         chk->book_size_scale = 0;
11976         SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size);
11977         return;
11978 }
11979
11980 int
11981 sctp_send_stream_reset_out_if_possible(struct sctp_tcb *stcb, int so_locked)
11982 {
11983         struct sctp_association *asoc;
11984         struct sctp_tmit_chunk *chk;
11985         struct sctp_chunkhdr *ch;
11986         uint32_t seq;
11987
11988         asoc = &stcb->asoc;
11989         asoc->trigger_reset = 0;
11990         if (asoc->stream_reset_outstanding) {
11991                 return (EALREADY);
11992         }
11993         sctp_alloc_a_chunk(stcb, chk);
11994         if (chk == NULL) {
11995                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
11996                 return (ENOMEM);
11997         }
11998         chk->copy_by_ref = 0;
11999         chk->rec.chunk_id.id = SCTP_STREAM_RESET;
12000         chk->rec.chunk_id.can_take_data = 0;
12001         chk->flags = 0;
12002         chk->asoc = &stcb->asoc;
12003         chk->book_size = sizeof(struct sctp_chunkhdr);
12004         chk->send_size = SCTP_SIZE32(chk->book_size);
12005         chk->book_size_scale = 0;
12006         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
12007         if (chk->data == NULL) {
12008                 sctp_free_a_chunk(stcb, chk, so_locked);
12009                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12010                 return (ENOMEM);
12011         }
12012         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
12013
12014         /* setup chunk parameters */
12015         chk->sent = SCTP_DATAGRAM_UNSENT;
12016         chk->snd_count = 0;
12017         if (stcb->asoc.alternate) {
12018                 chk->whoTo = stcb->asoc.alternate;
12019         } else {
12020                 chk->whoTo = stcb->asoc.primary_destination;
12021         }
12022         ch = mtod(chk->data, struct sctp_chunkhdr *);
12023         ch->chunk_type = SCTP_STREAM_RESET;
12024         ch->chunk_flags = 0;
12025         ch->chunk_length = htons(chk->book_size);
12026         atomic_add_int(&chk->whoTo->ref_count, 1);
12027         SCTP_BUF_LEN(chk->data) = chk->send_size;
12028         seq = stcb->asoc.str_reset_seq_out;
12029         if (sctp_add_stream_reset_out(stcb, chk, seq, (stcb->asoc.str_reset_seq_in - 1), (stcb->asoc.sending_seq - 1))) {
12030                 seq++;
12031                 asoc->stream_reset_outstanding++;
12032         } else {
12033                 m_freem(chk->data);
12034                 chk->data = NULL;
12035                 sctp_free_a_chunk(stcb, chk, so_locked);
12036                 return (ENOENT);
12037         }
12038         asoc->str_reset = chk;
12039         /* insert the chunk for sending */
12040         TAILQ_INSERT_TAIL(&asoc->control_send_queue,
12041             chk,
12042             sctp_next);
12043         asoc->ctrl_queue_cnt++;
12044
12045         if (stcb->asoc.send_sack) {
12046                 sctp_send_sack(stcb, so_locked);
12047         }
12048         sctp_timer_start(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb, chk->whoTo);
12049         return (0);
12050 }
12051
12052 int
12053 sctp_send_str_reset_req(struct sctp_tcb *stcb,
12054     uint16_t number_entries, uint16_t *list,
12055     uint8_t send_in_req,
12056     uint8_t send_tsn_req,
12057     uint8_t add_stream,
12058     uint16_t adding_o,
12059     uint16_t adding_i, uint8_t peer_asked)
12060 {
12061         struct sctp_association *asoc;
12062         struct sctp_tmit_chunk *chk;
12063         struct sctp_chunkhdr *ch;
12064         int can_send_out_req = 0;
12065         uint32_t seq;
12066
12067         asoc = &stcb->asoc;
12068         if (asoc->stream_reset_outstanding) {
12069                 /*-
12070                  * Already one pending, must get ACK back to clear the flag.
12071                  */
12072                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EBUSY);
12073                 return (EBUSY);
12074         }
12075         if ((send_in_req == 0) && (send_tsn_req == 0) &&
12076             (add_stream == 0)) {
12077                 /* nothing to do */
12078                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12079                 return (EINVAL);
12080         }
12081         if (send_tsn_req && send_in_req) {
12082                 /* error, can't do that */
12083                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12084                 return (EINVAL);
12085         } else if (send_in_req) {
12086                 can_send_out_req = 1;
12087         }
12088         if (number_entries > (MCLBYTES -
12089             SCTP_MIN_OVERHEAD -
12090             sizeof(struct sctp_chunkhdr) -
12091             sizeof(struct sctp_stream_reset_out_request)) /
12092             sizeof(uint16_t)) {
12093                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12094                 return (ENOMEM);
12095         }
12096         sctp_alloc_a_chunk(stcb, chk);
12097         if (chk == NULL) {
12098                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12099                 return (ENOMEM);
12100         }
12101         chk->copy_by_ref = 0;
12102         chk->rec.chunk_id.id = SCTP_STREAM_RESET;
12103         chk->rec.chunk_id.can_take_data = 0;
12104         chk->flags = 0;
12105         chk->asoc = &stcb->asoc;
12106         chk->book_size = sizeof(struct sctp_chunkhdr);
12107         chk->send_size = SCTP_SIZE32(chk->book_size);
12108         chk->book_size_scale = 0;
12109         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
12110         if (chk->data == NULL) {
12111                 sctp_free_a_chunk(stcb, chk, SCTP_SO_LOCKED);
12112                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12113                 return (ENOMEM);
12114         }
12115         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
12116
12117         /* setup chunk parameters */
12118         chk->sent = SCTP_DATAGRAM_UNSENT;
12119         chk->snd_count = 0;
12120         if (stcb->asoc.alternate) {
12121                 chk->whoTo = stcb->asoc.alternate;
12122         } else {
12123                 chk->whoTo = stcb->asoc.primary_destination;
12124         }
12125         atomic_add_int(&chk->whoTo->ref_count, 1);
12126         ch = mtod(chk->data, struct sctp_chunkhdr *);
12127         ch->chunk_type = SCTP_STREAM_RESET;
12128         ch->chunk_flags = 0;
12129         ch->chunk_length = htons(chk->book_size);
12130         SCTP_BUF_LEN(chk->data) = chk->send_size;
12131
12132         seq = stcb->asoc.str_reset_seq_out;
12133         if (can_send_out_req) {
12134                 int ret;
12135
12136                 ret = sctp_add_stream_reset_out(stcb, chk, seq, (stcb->asoc.str_reset_seq_in - 1), (stcb->asoc.sending_seq - 1));
12137                 if (ret) {
12138                         seq++;
12139                         asoc->stream_reset_outstanding++;
12140                 }
12141         }
12142         if ((add_stream & 1) &&
12143             ((stcb->asoc.strm_realoutsize - stcb->asoc.streamoutcnt) < adding_o)) {
12144                 /* Need to allocate more */
12145                 struct sctp_stream_out *oldstream;
12146                 struct sctp_stream_queue_pending *sp, *nsp;
12147                 int i;
12148 #if defined(SCTP_DETAILED_STR_STATS)
12149                 int j;
12150 #endif
12151
12152                 oldstream = stcb->asoc.strmout;
12153                 /* get some more */
12154                 SCTP_MALLOC(stcb->asoc.strmout, struct sctp_stream_out *,
12155                     (stcb->asoc.streamoutcnt + adding_o) * sizeof(struct sctp_stream_out),
12156                     SCTP_M_STRMO);
12157                 if (stcb->asoc.strmout == NULL) {
12158                         uint8_t x;
12159
12160                         stcb->asoc.strmout = oldstream;
12161                         /* Turn off the bit */
12162                         x = add_stream & 0xfe;
12163                         add_stream = x;
12164                         goto skip_stuff;
12165                 }
12166                 /*
12167                  * Ok now we proceed with copying the old out stuff and
12168                  * initializing the new stuff.
12169                  */
12170                 SCTP_TCB_SEND_LOCK(stcb);
12171                 stcb->asoc.ss_functions.sctp_ss_clear(stcb, &stcb->asoc, 0, 1);
12172                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
12173                         TAILQ_INIT(&stcb->asoc.strmout[i].outqueue);
12174                         stcb->asoc.strmout[i].chunks_on_queues = oldstream[i].chunks_on_queues;
12175                         stcb->asoc.strmout[i].next_mid_ordered = oldstream[i].next_mid_ordered;
12176                         stcb->asoc.strmout[i].next_mid_unordered = oldstream[i].next_mid_unordered;
12177                         stcb->asoc.strmout[i].last_msg_incomplete = oldstream[i].last_msg_incomplete;
12178                         stcb->asoc.strmout[i].sid = i;
12179                         stcb->asoc.strmout[i].state = oldstream[i].state;
12180                         /* FIX ME FIX ME */
12181                         /*
12182                          * This should be a SS_COPY operation FIX ME STREAM
12183                          * SCHEDULER EXPERT
12184                          */
12185                         stcb->asoc.ss_functions.sctp_ss_init_stream(stcb, &stcb->asoc.strmout[i], &oldstream[i]);
12186                         /* now anything on those queues? */
12187                         TAILQ_FOREACH_SAFE(sp, &oldstream[i].outqueue, next, nsp) {
12188                                 TAILQ_REMOVE(&oldstream[i].outqueue, sp, next);
12189                                 TAILQ_INSERT_TAIL(&stcb->asoc.strmout[i].outqueue, sp, next);
12190                         }
12191
12192                 }
12193                 /* now the new streams */
12194                 stcb->asoc.ss_functions.sctp_ss_init(stcb, &stcb->asoc, 1);
12195                 for (i = stcb->asoc.streamoutcnt; i < (stcb->asoc.streamoutcnt + adding_o); i++) {
12196                         TAILQ_INIT(&stcb->asoc.strmout[i].outqueue);
12197                         stcb->asoc.strmout[i].chunks_on_queues = 0;
12198 #if defined(SCTP_DETAILED_STR_STATS)
12199                         for (j = 0; j < SCTP_PR_SCTP_MAX + 1; j++) {
12200                                 stcb->asoc.strmout[i].abandoned_sent[j] = 0;
12201                                 stcb->asoc.strmout[i].abandoned_unsent[j] = 0;
12202                         }
12203 #else
12204                         stcb->asoc.strmout[i].abandoned_sent[0] = 0;
12205                         stcb->asoc.strmout[i].abandoned_unsent[0] = 0;
12206 #endif
12207                         stcb->asoc.strmout[i].next_mid_ordered = 0;
12208                         stcb->asoc.strmout[i].next_mid_unordered = 0;
12209                         stcb->asoc.strmout[i].sid = i;
12210                         stcb->asoc.strmout[i].last_msg_incomplete = 0;
12211                         stcb->asoc.ss_functions.sctp_ss_init_stream(stcb, &stcb->asoc.strmout[i], NULL);
12212                         stcb->asoc.strmout[i].state = SCTP_STREAM_CLOSED;
12213                 }
12214                 stcb->asoc.strm_realoutsize = stcb->asoc.streamoutcnt + adding_o;
12215                 SCTP_FREE(oldstream, SCTP_M_STRMO);
12216                 SCTP_TCB_SEND_UNLOCK(stcb);
12217         }
12218 skip_stuff:
12219         if ((add_stream & 1) && (adding_o > 0)) {
12220                 asoc->strm_pending_add_size = adding_o;
12221                 asoc->peer_req_out = peer_asked;
12222                 sctp_add_an_out_stream(chk, seq, adding_o);
12223                 seq++;
12224                 asoc->stream_reset_outstanding++;
12225         }
12226         if ((add_stream & 2) && (adding_i > 0)) {
12227                 sctp_add_an_in_stream(chk, seq, adding_i);
12228                 seq++;
12229                 asoc->stream_reset_outstanding++;
12230         }
12231         if (send_in_req) {
12232                 sctp_add_stream_reset_in(chk, number_entries, list, seq);
12233                 seq++;
12234                 asoc->stream_reset_outstanding++;
12235         }
12236         if (send_tsn_req) {
12237                 sctp_add_stream_reset_tsn(chk, seq);
12238                 asoc->stream_reset_outstanding++;
12239         }
12240         asoc->str_reset = chk;
12241         /* insert the chunk for sending */
12242         TAILQ_INSERT_TAIL(&asoc->control_send_queue,
12243             chk,
12244             sctp_next);
12245         asoc->ctrl_queue_cnt++;
12246         if (stcb->asoc.send_sack) {
12247                 sctp_send_sack(stcb, SCTP_SO_LOCKED);
12248         }
12249         sctp_timer_start(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb, chk->whoTo);
12250         return (0);
12251 }
12252
12253 void
12254 sctp_send_abort(struct mbuf *m, int iphlen, struct sockaddr *src, struct sockaddr *dst,
12255     struct sctphdr *sh, uint32_t vtag, struct mbuf *cause,
12256     uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum,
12257     uint32_t vrf_id, uint16_t port)
12258 {
12259         /* Don't respond to an ABORT with an ABORT. */
12260         if (sctp_is_there_an_abort_here(m, iphlen, &vtag)) {
12261                 if (cause)
12262                         sctp_m_freem(cause);
12263                 return;
12264         }
12265         sctp_send_resp_msg(src, dst, sh, vtag, SCTP_ABORT_ASSOCIATION, cause,
12266             mflowtype, mflowid, fibnum,
12267             vrf_id, port);
12268         return;
12269 }
12270
12271 void
12272 sctp_send_operr_to(struct sockaddr *src, struct sockaddr *dst,
12273     struct sctphdr *sh, uint32_t vtag, struct mbuf *cause,
12274     uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum,
12275     uint32_t vrf_id, uint16_t port)
12276 {
12277         sctp_send_resp_msg(src, dst, sh, vtag, SCTP_OPERATION_ERROR, cause,
12278             mflowtype, mflowid, fibnum,
12279             vrf_id, port);
12280         return;
12281 }
12282
12283 static struct mbuf *
12284 sctp_copy_resume(struct uio *uio,
12285     int max_send_len,
12286     int user_marks_eor,
12287     int *error,
12288     uint32_t *sndout,
12289     struct mbuf **new_tail)
12290 {
12291         struct mbuf *m;
12292
12293         m = m_uiotombuf(uio, M_WAITOK, max_send_len, 0,
12294             (M_PKTHDR | (user_marks_eor ? M_EOR : 0)));
12295         if (m == NULL) {
12296                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOBUFS);
12297                 *error = ENOBUFS;
12298         } else {
12299                 *sndout = m_length(m, NULL);
12300                 *new_tail = m_last(m);
12301         }
12302         return (m);
12303 }
12304
12305 static int
12306 sctp_copy_one(struct sctp_stream_queue_pending *sp,
12307     struct uio *uio,
12308     int resv_upfront)
12309 {
12310         sp->data = m_uiotombuf(uio, M_WAITOK, sp->length,
12311             resv_upfront, 0);
12312         if (sp->data == NULL) {
12313                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOBUFS);
12314                 return (ENOBUFS);
12315         }
12316
12317         sp->tail_mbuf = m_last(sp->data);
12318         return (0);
12319 }
12320
12321
12322
12323 static struct sctp_stream_queue_pending *
12324 sctp_copy_it_in(struct sctp_tcb *stcb,
12325     struct sctp_association *asoc,
12326     struct sctp_sndrcvinfo *srcv,
12327     struct uio *uio,
12328     struct sctp_nets *net,
12329     ssize_t max_send_len,
12330     int user_marks_eor,
12331     int *error)
12332 {
12333
12334         /*-
12335          * This routine must be very careful in its work. Protocol
12336          * processing is up and running so care must be taken to spl...()
12337          * when you need to do something that may effect the stcb/asoc. The
12338          * sb is locked however. When data is copied the protocol processing
12339          * should be enabled since this is a slower operation...
12340          */
12341         struct sctp_stream_queue_pending *sp = NULL;
12342         int resv_in_first;
12343
12344         *error = 0;
12345         /* Now can we send this? */
12346         if ((SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_SENT) ||
12347             (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_ACK_SENT) ||
12348             (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_RECEIVED) ||
12349             (asoc->state & SCTP_STATE_SHUTDOWN_PENDING)) {
12350                 /* got data while shutting down */
12351                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
12352                 *error = ECONNRESET;
12353                 goto out_now;
12354         }
12355         sctp_alloc_a_strmoq(stcb, sp);
12356         if (sp == NULL) {
12357                 SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12358                 *error = ENOMEM;
12359                 goto out_now;
12360         }
12361         sp->act_flags = 0;
12362         sp->sender_all_done = 0;
12363         sp->sinfo_flags = srcv->sinfo_flags;
12364         sp->timetolive = srcv->sinfo_timetolive;
12365         sp->ppid = srcv->sinfo_ppid;
12366         sp->context = srcv->sinfo_context;
12367         sp->fsn = 0;
12368         (void)SCTP_GETTIME_TIMEVAL(&sp->ts);
12369
12370         sp->sid = srcv->sinfo_stream;
12371         sp->length = (uint32_t)min(uio->uio_resid, max_send_len);
12372         if ((sp->length == (uint32_t)uio->uio_resid) &&
12373             ((user_marks_eor == 0) ||
12374             (srcv->sinfo_flags & SCTP_EOF) ||
12375             (user_marks_eor && (srcv->sinfo_flags & SCTP_EOR)))) {
12376                 sp->msg_is_complete = 1;
12377         } else {
12378                 sp->msg_is_complete = 0;
12379         }
12380         sp->sender_all_done = 0;
12381         sp->some_taken = 0;
12382         sp->put_last_out = 0;
12383         resv_in_first = SCTP_DATA_CHUNK_OVERHEAD(stcb);
12384         sp->data = sp->tail_mbuf = NULL;
12385         if (sp->length == 0) {
12386                 goto skip_copy;
12387         }
12388         if (srcv->sinfo_keynumber_valid) {
12389                 sp->auth_keyid = srcv->sinfo_keynumber;
12390         } else {
12391                 sp->auth_keyid = stcb->asoc.authinfo.active_keyid;
12392         }
12393         if (sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks)) {
12394                 sctp_auth_key_acquire(stcb, sp->auth_keyid);
12395                 sp->holds_key_ref = 1;
12396         }
12397         *error = sctp_copy_one(sp, uio, resv_in_first);
12398 skip_copy:
12399         if (*error) {
12400                 sctp_free_a_strmoq(stcb, sp, SCTP_SO_LOCKED);
12401                 sp = NULL;
12402         } else {
12403                 if (sp->sinfo_flags & SCTP_ADDR_OVER) {
12404                         sp->net = net;
12405                         atomic_add_int(&sp->net->ref_count, 1);
12406                 } else {
12407                         sp->net = NULL;
12408                 }
12409                 sctp_set_prsctp_policy(sp);
12410         }
12411 out_now:
12412         return (sp);
12413 }
12414
12415
12416 int
12417 sctp_sosend(struct socket *so,
12418     struct sockaddr *addr,
12419     struct uio *uio,
12420     struct mbuf *top,
12421     struct mbuf *control,
12422     int flags,
12423     struct thread *p
12424 )
12425 {
12426         int error, use_sndinfo = 0;
12427         struct sctp_sndrcvinfo sndrcvninfo;
12428         struct sockaddr *addr_to_use;
12429 #if defined(INET) && defined(INET6)
12430         struct sockaddr_in sin;
12431 #endif
12432
12433         if (control) {
12434                 /* process cmsg snd/rcv info (maybe a assoc-id) */
12435                 if (sctp_find_cmsg(SCTP_SNDRCV, (void *)&sndrcvninfo, control,
12436                     sizeof(sndrcvninfo))) {
12437                         /* got one */
12438                         use_sndinfo = 1;
12439                 }
12440         }
12441         addr_to_use = addr;
12442 #if defined(INET) && defined(INET6)
12443         if ((addr) && (addr->sa_family == AF_INET6)) {
12444                 struct sockaddr_in6 *sin6;
12445
12446                 sin6 = (struct sockaddr_in6 *)addr;
12447                 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
12448                         in6_sin6_2_sin(&sin, sin6);
12449                         addr_to_use = (struct sockaddr *)&sin;
12450                 }
12451         }
12452 #endif
12453         error = sctp_lower_sosend(so, addr_to_use, uio, top,
12454             control,
12455             flags,
12456             use_sndinfo ? &sndrcvninfo : NULL
12457             ,p
12458             );
12459         return (error);
12460 }
12461
12462
12463 int
12464 sctp_lower_sosend(struct socket *so,
12465     struct sockaddr *addr,
12466     struct uio *uio,
12467     struct mbuf *i_pak,
12468     struct mbuf *control,
12469     int flags,
12470     struct sctp_sndrcvinfo *srcv
12471     ,
12472     struct thread *p
12473 )
12474 {
12475         ssize_t sndlen = 0, max_len, local_add_more;
12476         int error, len;
12477         struct mbuf *top = NULL;
12478         int queue_only = 0, queue_only_for_init = 0;
12479         int free_cnt_applied = 0;
12480         int un_sent;
12481         int now_filled = 0;
12482         unsigned int inqueue_bytes = 0;
12483         struct sctp_block_entry be;
12484         struct sctp_inpcb *inp;
12485         struct sctp_tcb *stcb = NULL;
12486         struct timeval now;
12487         struct sctp_nets *net;
12488         struct sctp_association *asoc;
12489         struct sctp_inpcb *t_inp;
12490         int user_marks_eor;
12491         int create_lock_applied = 0;
12492         int nagle_applies = 0;
12493         int some_on_control = 0;
12494         int got_all_of_the_send = 0;
12495         int hold_tcblock = 0;
12496         int non_blocking = 0;
12497         ssize_t local_soresv = 0;
12498         uint16_t port;
12499         uint16_t sinfo_flags;
12500         sctp_assoc_t sinfo_assoc_id;
12501
12502         error = 0;
12503         net = NULL;
12504         stcb = NULL;
12505         asoc = NULL;
12506
12507         t_inp = inp = (struct sctp_inpcb *)so->so_pcb;
12508         if (inp == NULL) {
12509                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12510                 error = EINVAL;
12511                 if (i_pak) {
12512                         SCTP_RELEASE_PKT(i_pak);
12513                 }
12514                 return (error);
12515         }
12516         if ((uio == NULL) && (i_pak == NULL)) {
12517                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12518                 return (EINVAL);
12519         }
12520         user_marks_eor = sctp_is_feature_on(inp, SCTP_PCB_FLAGS_EXPLICIT_EOR);
12521         atomic_add_int(&inp->total_sends, 1);
12522         if (uio) {
12523                 if (uio->uio_resid < 0) {
12524                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12525                         return (EINVAL);
12526                 }
12527                 sndlen = uio->uio_resid;
12528         } else {
12529                 top = SCTP_HEADER_TO_CHAIN(i_pak);
12530                 sndlen = SCTP_HEADER_LEN(i_pak);
12531         }
12532         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Send called addr:%p send length %zd\n",
12533             (void *)addr,
12534             sndlen);
12535         if ((inp->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) &&
12536             SCTP_IS_LISTENING(inp)) {
12537                 /* The listener can NOT send */
12538                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOTCONN);
12539                 error = ENOTCONN;
12540                 goto out_unlocked;
12541         }
12542         /**
12543          * Pre-screen address, if one is given the sin-len
12544          * must be set correctly!
12545          */
12546         if (addr) {
12547                 union sctp_sockstore *raddr = (union sctp_sockstore *)addr;
12548
12549                 switch (raddr->sa.sa_family) {
12550 #ifdef INET
12551                 case AF_INET:
12552                         if (raddr->sin.sin_len != sizeof(struct sockaddr_in)) {
12553                                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12554                                 error = EINVAL;
12555                                 goto out_unlocked;
12556                         }
12557                         port = raddr->sin.sin_port;
12558                         break;
12559 #endif
12560 #ifdef INET6
12561                 case AF_INET6:
12562                         if (raddr->sin6.sin6_len != sizeof(struct sockaddr_in6)) {
12563                                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12564                                 error = EINVAL;
12565                                 goto out_unlocked;
12566                         }
12567                         port = raddr->sin6.sin6_port;
12568                         break;
12569 #endif
12570                 default:
12571                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EAFNOSUPPORT);
12572                         error = EAFNOSUPPORT;
12573                         goto out_unlocked;
12574                 }
12575         } else
12576                 port = 0;
12577
12578         if (srcv) {
12579                 sinfo_flags = srcv->sinfo_flags;
12580                 sinfo_assoc_id = srcv->sinfo_assoc_id;
12581                 if (INVALID_SINFO_FLAG(sinfo_flags) ||
12582                     PR_SCTP_INVALID_POLICY(sinfo_flags)) {
12583                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12584                         error = EINVAL;
12585                         goto out_unlocked;
12586                 }
12587                 if (srcv->sinfo_flags)
12588                         SCTP_STAT_INCR(sctps_sends_with_flags);
12589         } else {
12590                 sinfo_flags = inp->def_send.sinfo_flags;
12591                 sinfo_assoc_id = inp->def_send.sinfo_assoc_id;
12592         }
12593         if (flags & MSG_EOR) {
12594                 sinfo_flags |= SCTP_EOR;
12595         }
12596         if (flags & MSG_EOF) {
12597                 sinfo_flags |= SCTP_EOF;
12598         }
12599         if (sinfo_flags & SCTP_SENDALL) {
12600                 /* its a sendall */
12601                 error = sctp_sendall(inp, uio, top, srcv);
12602                 top = NULL;
12603                 goto out_unlocked;
12604         }
12605         if ((sinfo_flags & SCTP_ADDR_OVER) && (addr == NULL)) {
12606                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12607                 error = EINVAL;
12608                 goto out_unlocked;
12609         }
12610         /* now we must find the assoc */
12611         if ((inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) ||
12612             (inp->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) {
12613                 SCTP_INP_RLOCK(inp);
12614                 stcb = LIST_FIRST(&inp->sctp_asoc_list);
12615                 if (stcb) {
12616                         SCTP_TCB_LOCK(stcb);
12617                         hold_tcblock = 1;
12618                 }
12619                 SCTP_INP_RUNLOCK(inp);
12620         } else if (sinfo_assoc_id) {
12621                 stcb = sctp_findassociation_ep_asocid(inp, sinfo_assoc_id, 1);
12622                 if (stcb != NULL) {
12623                         hold_tcblock = 1;
12624                 }
12625         } else if (addr) {
12626                 /*-
12627                  * Since we did not use findep we must
12628                  * increment it, and if we don't find a tcb
12629                  * decrement it.
12630                  */
12631                 SCTP_INP_WLOCK(inp);
12632                 SCTP_INP_INCR_REF(inp);
12633                 SCTP_INP_WUNLOCK(inp);
12634                 stcb = sctp_findassociation_ep_addr(&t_inp, addr, &net, NULL, NULL);
12635                 if (stcb == NULL) {
12636                         SCTP_INP_WLOCK(inp);
12637                         SCTP_INP_DECR_REF(inp);
12638                         SCTP_INP_WUNLOCK(inp);
12639                 } else {
12640                         hold_tcblock = 1;
12641                 }
12642         }
12643         if ((stcb == NULL) && (addr)) {
12644                 /* Possible implicit send? */
12645                 SCTP_ASOC_CREATE_LOCK(inp);
12646                 create_lock_applied = 1;
12647                 if ((inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) ||
12648                     (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE)) {
12649                         /* Should I really unlock ? */
12650                         SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12651                         error = EINVAL;
12652                         goto out_unlocked;
12653
12654                 }
12655                 if (((inp->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) == 0) &&
12656                     (addr->sa_family == AF_INET6)) {
12657                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12658                         error = EINVAL;
12659                         goto out_unlocked;
12660                 }
12661                 SCTP_INP_WLOCK(inp);
12662                 SCTP_INP_INCR_REF(inp);
12663                 SCTP_INP_WUNLOCK(inp);
12664                 /* With the lock applied look again */
12665                 stcb = sctp_findassociation_ep_addr(&t_inp, addr, &net, NULL, NULL);
12666 #if defined(INET) || defined(INET6)
12667                 if ((stcb == NULL) && (control != NULL) && (port > 0)) {
12668                         stcb = sctp_findassociation_cmsgs(&t_inp, port, control, &net, &error);
12669                 }
12670 #endif
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                 if (error) {
12679                         goto out_unlocked;
12680                 }
12681                 if (t_inp != inp) {
12682                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOTCONN);
12683                         error = ENOTCONN;
12684                         goto out_unlocked;
12685                 }
12686         }
12687         if (stcb == NULL) {
12688                 if (addr == NULL) {
12689                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOENT);
12690                         error = ENOENT;
12691                         goto out_unlocked;
12692                 } else {
12693                         /* We must go ahead and start the INIT process */
12694                         uint32_t vrf_id;
12695
12696                         if ((sinfo_flags & SCTP_ABORT) ||
12697                             ((sinfo_flags & SCTP_EOF) && (sndlen == 0))) {
12698                                 /*-
12699                                  * User asks to abort a non-existent assoc,
12700                                  * or EOF a non-existent assoc with no data
12701                                  */
12702                                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOENT);
12703                                 error = ENOENT;
12704                                 goto out_unlocked;
12705                         }
12706                         /* get an asoc/stcb struct */
12707                         vrf_id = inp->def_vrf_id;
12708 #ifdef INVARIANTS
12709                         if (create_lock_applied == 0) {
12710                                 panic("Error, should hold create lock and I don't?");
12711                         }
12712 #endif
12713                         stcb = sctp_aloc_assoc(inp, addr, &error, 0, vrf_id,
12714                             inp->sctp_ep.pre_open_stream_count,
12715                             inp->sctp_ep.port,
12716                             p,
12717                             SCTP_INITIALIZE_AUTH_PARAMS);
12718                         if (stcb == NULL) {
12719                                 /* Error is setup for us in the call */
12720                                 goto out_unlocked;
12721                         }
12722                         if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) {
12723                                 stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED;
12724                                 /*
12725                                  * Set the connected flag so we can queue
12726                                  * data
12727                                  */
12728                                 soisconnecting(so);
12729                         }
12730                         hold_tcblock = 1;
12731                         if (create_lock_applied) {
12732                                 SCTP_ASOC_CREATE_UNLOCK(inp);
12733                                 create_lock_applied = 0;
12734                         } else {
12735                                 SCTP_PRINTF("Huh-3? create lock should have been on??\n");
12736                         }
12737                         /*
12738                          * Turn on queue only flag to prevent data from
12739                          * being sent
12740                          */
12741                         queue_only = 1;
12742                         asoc = &stcb->asoc;
12743                         SCTP_SET_STATE(stcb, SCTP_STATE_COOKIE_WAIT);
12744                         (void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered);
12745
12746                         if (control) {
12747                                 if (sctp_process_cmsgs_for_init(stcb, control, &error)) {
12748                                         sctp_free_assoc(inp, stcb, SCTP_PCBFREE_FORCE,
12749                                             SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_6);
12750                                         hold_tcblock = 0;
12751                                         stcb = NULL;
12752                                         goto out_unlocked;
12753                                 }
12754                         }
12755                         /* out with the INIT */
12756                         queue_only_for_init = 1;
12757                         /*-
12758                          * we may want to dig in after this call and adjust the MTU
12759                          * value. It defaulted to 1500 (constant) but the ro
12760                          * structure may now have an update and thus we may need to
12761                          * change it BEFORE we append the message.
12762                          */
12763                 }
12764         } else
12765                 asoc = &stcb->asoc;
12766         if (srcv == NULL) {
12767                 srcv = (struct sctp_sndrcvinfo *)&asoc->def_send;
12768                 sinfo_flags = srcv->sinfo_flags;
12769                 if (flags & MSG_EOR) {
12770                         sinfo_flags |= SCTP_EOR;
12771                 }
12772                 if (flags & MSG_EOF) {
12773                         sinfo_flags |= SCTP_EOF;
12774                 }
12775         }
12776         if (sinfo_flags & SCTP_ADDR_OVER) {
12777                 if (addr)
12778                         net = sctp_findnet(stcb, addr);
12779                 else
12780                         net = NULL;
12781                 if ((net == NULL) ||
12782                     ((port != 0) && (port != stcb->rport))) {
12783                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12784                         error = EINVAL;
12785                         goto out_unlocked;
12786                 }
12787         } else {
12788                 if (stcb->asoc.alternate) {
12789                         net = stcb->asoc.alternate;
12790                 } else {
12791                         net = stcb->asoc.primary_destination;
12792                 }
12793         }
12794         atomic_add_int(&stcb->total_sends, 1);
12795         /* Keep the stcb from being freed under our feet */
12796         atomic_add_int(&asoc->refcnt, 1);
12797         free_cnt_applied = 1;
12798
12799         if (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_NO_FRAGMENT)) {
12800                 if (sndlen > (ssize_t)asoc->smallest_mtu) {
12801                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EMSGSIZE);
12802                         error = EMSGSIZE;
12803                         goto out_unlocked;
12804                 }
12805         }
12806         if (SCTP_SO_IS_NBIO(so)
12807             || (flags & (MSG_NBIO | MSG_DONTWAIT)) != 0
12808             ) {
12809                 non_blocking = 1;
12810         }
12811         /* would we block? */
12812         if (non_blocking) {
12813                 ssize_t amount;
12814
12815                 if (hold_tcblock == 0) {
12816                         SCTP_TCB_LOCK(stcb);
12817                         hold_tcblock = 1;
12818                 }
12819                 inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * SCTP_DATA_CHUNK_OVERHEAD(stcb));
12820                 if (user_marks_eor == 0) {
12821                         amount = sndlen;
12822                 } else {
12823                         amount = 1;
12824                 }
12825                 if ((SCTP_SB_LIMIT_SND(so) < (amount + inqueue_bytes + stcb->asoc.sb_send_resv)) ||
12826                     (stcb->asoc.chunks_on_out_queue >= SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue))) {
12827                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EWOULDBLOCK);
12828                         if (sndlen > (ssize_t)SCTP_SB_LIMIT_SND(so))
12829                                 error = EMSGSIZE;
12830                         else
12831                                 error = EWOULDBLOCK;
12832                         goto out_unlocked;
12833                 }
12834                 stcb->asoc.sb_send_resv += (uint32_t)sndlen;
12835                 SCTP_TCB_UNLOCK(stcb);
12836                 hold_tcblock = 0;
12837         } else {
12838                 atomic_add_int(&stcb->asoc.sb_send_resv, sndlen);
12839         }
12840         local_soresv = sndlen;
12841         if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
12842                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
12843                 error = ECONNRESET;
12844                 goto out_unlocked;
12845         }
12846         if (create_lock_applied) {
12847                 SCTP_ASOC_CREATE_UNLOCK(inp);
12848                 create_lock_applied = 0;
12849         }
12850         /* Is the stream no. valid? */
12851         if (srcv->sinfo_stream >= asoc->streamoutcnt) {
12852                 /* Invalid stream number */
12853                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12854                 error = EINVAL;
12855                 goto out_unlocked;
12856         }
12857         if ((asoc->strmout[srcv->sinfo_stream].state != SCTP_STREAM_OPEN) &&
12858             (asoc->strmout[srcv->sinfo_stream].state != SCTP_STREAM_OPENING)) {
12859                 /*
12860                  * Can't queue any data while stream reset is underway.
12861                  */
12862                 if (asoc->strmout[srcv->sinfo_stream].state > SCTP_STREAM_OPEN) {
12863                         error = EAGAIN;
12864                 } else {
12865                         error = EINVAL;
12866                 }
12867                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, error);
12868                 goto out_unlocked;
12869         }
12870         if ((SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_WAIT) ||
12871             (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)) {
12872                 queue_only = 1;
12873         }
12874         /* we are now done with all control */
12875         if (control) {
12876                 sctp_m_freem(control);
12877                 control = NULL;
12878         }
12879         if ((SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_SENT) ||
12880             (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_RECEIVED) ||
12881             (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_ACK_SENT) ||
12882             (asoc->state & SCTP_STATE_SHUTDOWN_PENDING)) {
12883                 if (sinfo_flags & SCTP_ABORT) {
12884                         ;
12885                 } else {
12886                         SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
12887                         error = ECONNRESET;
12888                         goto out_unlocked;
12889                 }
12890         }
12891         /* Ok, we will attempt a msgsnd :> */
12892         if (p) {
12893                 p->td_ru.ru_msgsnd++;
12894         }
12895         /* Are we aborting? */
12896         if (sinfo_flags & SCTP_ABORT) {
12897                 struct mbuf *mm;
12898                 ssize_t tot_demand, tot_out = 0, max_out;
12899
12900                 SCTP_STAT_INCR(sctps_sends_with_abort);
12901                 if ((SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_WAIT) ||
12902                     (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)) {
12903                         /* It has to be up before we abort */
12904                         /* how big is the user initiated abort? */
12905                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12906                         error = EINVAL;
12907                         goto out;
12908                 }
12909                 if (hold_tcblock) {
12910                         SCTP_TCB_UNLOCK(stcb);
12911                         hold_tcblock = 0;
12912                 }
12913                 if (top) {
12914                         struct mbuf *cntm = NULL;
12915
12916                         mm = sctp_get_mbuf_for_msg(sizeof(struct sctp_paramhdr), 0, M_WAITOK, 1, MT_DATA);
12917                         if (sndlen != 0) {
12918                                 for (cntm = top; cntm; cntm = SCTP_BUF_NEXT(cntm)) {
12919                                         tot_out += SCTP_BUF_LEN(cntm);
12920                                 }
12921                         }
12922                 } else {
12923                         /* Must fit in a MTU */
12924                         tot_out = sndlen;
12925                         tot_demand = (tot_out + sizeof(struct sctp_paramhdr));
12926                         if (tot_demand > SCTP_DEFAULT_ADD_MORE) {
12927                                 /* To big */
12928                                 SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EMSGSIZE);
12929                                 error = EMSGSIZE;
12930                                 goto out;
12931                         }
12932                         mm = sctp_get_mbuf_for_msg((unsigned int)tot_demand, 0, M_WAITOK, 1, MT_DATA);
12933                 }
12934                 if (mm == NULL) {
12935                         SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12936                         error = ENOMEM;
12937                         goto out;
12938                 }
12939                 max_out = asoc->smallest_mtu - sizeof(struct sctp_paramhdr);
12940                 max_out -= sizeof(struct sctp_abort_msg);
12941                 if (tot_out > max_out) {
12942                         tot_out = max_out;
12943                 }
12944                 if (mm) {
12945                         struct sctp_paramhdr *ph;
12946
12947                         /* now move forward the data pointer */
12948                         ph = mtod(mm, struct sctp_paramhdr *);
12949                         ph->param_type = htons(SCTP_CAUSE_USER_INITIATED_ABT);
12950                         ph->param_length = htons((uint16_t)(sizeof(struct sctp_paramhdr) + tot_out));
12951                         ph++;
12952                         SCTP_BUF_LEN(mm) = (int)(tot_out + sizeof(struct sctp_paramhdr));
12953                         if (top == NULL) {
12954                                 error = uiomove((caddr_t)ph, (int)tot_out, uio);
12955                                 if (error) {
12956                                         /*-
12957                                          * Here if we can't get his data we
12958                                          * still abort we just don't get to
12959                                          * send the users note :-0
12960                                          */
12961                                         sctp_m_freem(mm);
12962                                         mm = NULL;
12963                                 }
12964                         } else {
12965                                 if (sndlen != 0) {
12966                                         SCTP_BUF_NEXT(mm) = top;
12967                                 }
12968                         }
12969                 }
12970                 if (hold_tcblock == 0) {
12971                         SCTP_TCB_LOCK(stcb);
12972                 }
12973                 atomic_add_int(&stcb->asoc.refcnt, -1);
12974                 free_cnt_applied = 0;
12975                 /* release this lock, otherwise we hang on ourselves */
12976                 sctp_abort_an_association(stcb->sctp_ep, stcb, mm, SCTP_SO_LOCKED);
12977                 /* now relock the stcb so everything is sane */
12978                 hold_tcblock = 0;
12979                 stcb = NULL;
12980                 /*
12981                  * In this case top is already chained to mm avoid double
12982                  * free, since we free it below if top != NULL and driver
12983                  * would free it after sending the packet out
12984                  */
12985                 if (sndlen != 0) {
12986                         top = NULL;
12987                 }
12988                 goto out_unlocked;
12989         }
12990         /* Calculate the maximum we can send */
12991         inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * SCTP_DATA_CHUNK_OVERHEAD(stcb));
12992         if (SCTP_SB_LIMIT_SND(so) > inqueue_bytes) {
12993                 max_len = SCTP_SB_LIMIT_SND(so) - inqueue_bytes;
12994         } else {
12995                 max_len = 0;
12996         }
12997         if (hold_tcblock) {
12998                 SCTP_TCB_UNLOCK(stcb);
12999                 hold_tcblock = 0;
13000         }
13001         if (asoc->strmout == NULL) {
13002                 /* huh? software error */
13003                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EFAULT);
13004                 error = EFAULT;
13005                 goto out_unlocked;
13006         }
13007
13008         /* Unless E_EOR mode is on, we must make a send FIT in one call. */
13009         if ((user_marks_eor == 0) &&
13010             (sndlen > (ssize_t)SCTP_SB_LIMIT_SND(stcb->sctp_socket))) {
13011                 /* It will NEVER fit */
13012                 SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EMSGSIZE);
13013                 error = EMSGSIZE;
13014                 goto out_unlocked;
13015         }
13016         if ((uio == NULL) && user_marks_eor) {
13017                 /*-
13018                  * We do not support eeor mode for
13019                  * sending with mbuf chains (like sendfile).
13020                  */
13021                 SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
13022                 error = EINVAL;
13023                 goto out_unlocked;
13024         }
13025
13026         if (user_marks_eor) {
13027                 local_add_more = (ssize_t)min(SCTP_SB_LIMIT_SND(so), SCTP_BASE_SYSCTL(sctp_add_more_threshold));
13028         } else {
13029                 /*-
13030                  * For non-eeor the whole message must fit in
13031                  * the socket send buffer.
13032                  */
13033                 local_add_more = sndlen;
13034         }
13035         len = 0;
13036         if (non_blocking) {
13037                 goto skip_preblock;
13038         }
13039         if (((max_len <= local_add_more) &&
13040             ((ssize_t)SCTP_SB_LIMIT_SND(so) >= local_add_more)) ||
13041             (max_len == 0) ||
13042             ((stcb->asoc.chunks_on_out_queue + stcb->asoc.stream_queue_cnt) >= SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue))) {
13043                 /* No room right now ! */
13044                 SOCKBUF_LOCK(&so->so_snd);
13045                 inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * SCTP_DATA_CHUNK_OVERHEAD(stcb));
13046                 while ((SCTP_SB_LIMIT_SND(so) < (inqueue_bytes + local_add_more)) ||
13047                     ((stcb->asoc.stream_queue_cnt + stcb->asoc.chunks_on_out_queue) >= SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue))) {
13048                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "pre_block limit:%u <(inq:%d + %zd) || (%d+%d > %d)\n",
13049                             (unsigned int)SCTP_SB_LIMIT_SND(so),
13050                             inqueue_bytes,
13051                             local_add_more,
13052                             stcb->asoc.stream_queue_cnt,
13053                             stcb->asoc.chunks_on_out_queue,
13054                             SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue));
13055                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13056                                 sctp_log_block(SCTP_BLOCK_LOG_INTO_BLKA, asoc, sndlen);
13057                         }
13058                         be.error = 0;
13059                         stcb->block_entry = &be;
13060                         error = sbwait(&so->so_snd);
13061                         stcb->block_entry = NULL;
13062                         if (error || so->so_error || be.error) {
13063                                 if (error == 0) {
13064                                         if (so->so_error)
13065                                                 error = so->so_error;
13066                                         if (be.error) {
13067                                                 error = be.error;
13068                                         }
13069                                 }
13070                                 SOCKBUF_UNLOCK(&so->so_snd);
13071                                 goto out_unlocked;
13072                         }
13073                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13074                                 sctp_log_block(SCTP_BLOCK_LOG_OUTOF_BLK,
13075                                     asoc, stcb->asoc.total_output_queue_size);
13076                         }
13077                         if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
13078                                 SOCKBUF_UNLOCK(&so->so_snd);
13079                                 goto out_unlocked;
13080                         }
13081                         inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * SCTP_DATA_CHUNK_OVERHEAD(stcb));
13082                 }
13083                 if (SCTP_SB_LIMIT_SND(so) > inqueue_bytes) {
13084                         max_len = SCTP_SB_LIMIT_SND(so) - inqueue_bytes;
13085                 } else {
13086                         max_len = 0;
13087                 }
13088                 SOCKBUF_UNLOCK(&so->so_snd);
13089         }
13090
13091 skip_preblock:
13092         if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
13093                 goto out_unlocked;
13094         }
13095         /*
13096          * sndlen covers for mbuf case uio_resid covers for the non-mbuf
13097          * case NOTE: uio will be null when top/mbuf is passed
13098          */
13099         if (sndlen == 0) {
13100                 if (sinfo_flags & SCTP_EOF) {
13101                         got_all_of_the_send = 1;
13102                         goto dataless_eof;
13103                 } else {
13104                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
13105                         error = EINVAL;
13106                         goto out;
13107                 }
13108         }
13109         if (top == NULL) {
13110                 struct sctp_stream_queue_pending *sp;
13111                 struct sctp_stream_out *strm;
13112                 uint32_t sndout;
13113
13114                 SCTP_TCB_SEND_LOCK(stcb);
13115                 if ((asoc->stream_locked) &&
13116                     (asoc->stream_locked_on != srcv->sinfo_stream)) {
13117                         SCTP_TCB_SEND_UNLOCK(stcb);
13118                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
13119                         error = EINVAL;
13120                         goto out;
13121                 }
13122                 strm = &stcb->asoc.strmout[srcv->sinfo_stream];
13123                 if (strm->last_msg_incomplete == 0) {
13124         do_a_copy_in:
13125                         SCTP_TCB_SEND_UNLOCK(stcb);
13126                         sp = sctp_copy_it_in(stcb, asoc, srcv, uio, net, max_len, user_marks_eor, &error);
13127                         if (error) {
13128                                 goto out;
13129                         }
13130                         SCTP_TCB_SEND_LOCK(stcb);
13131                         if (sp->msg_is_complete) {
13132                                 strm->last_msg_incomplete = 0;
13133                                 asoc->stream_locked = 0;
13134                         } else {
13135                                 /*
13136                                  * Just got locked to this guy in case of an
13137                                  * interrupt.
13138                                  */
13139                                 strm->last_msg_incomplete = 1;
13140                                 if (stcb->asoc.idata_supported == 0) {
13141                                         asoc->stream_locked = 1;
13142                                         asoc->stream_locked_on = srcv->sinfo_stream;
13143                                 }
13144                                 sp->sender_all_done = 0;
13145                         }
13146                         sctp_snd_sb_alloc(stcb, sp->length);
13147                         atomic_add_int(&asoc->stream_queue_cnt, 1);
13148                         if (sinfo_flags & SCTP_UNORDERED) {
13149                                 SCTP_STAT_INCR(sctps_sends_with_unord);
13150                         }
13151                         sp->processing = 1;
13152                         TAILQ_INSERT_TAIL(&strm->outqueue, sp, next);
13153                         stcb->asoc.ss_functions.sctp_ss_add_to_stream(stcb, asoc, strm, sp, 1);
13154                 } else {
13155                         sp = TAILQ_LAST(&strm->outqueue, sctp_streamhead);
13156                         if (sp == NULL) {
13157                                 /* ???? Huh ??? last msg is gone */
13158 #ifdef INVARIANTS
13159                                 panic("Warning: Last msg marked incomplete, yet nothing left?");
13160 #else
13161                                 SCTP_PRINTF("Warning: Last msg marked incomplete, yet nothing left?\n");
13162                                 strm->last_msg_incomplete = 0;
13163 #endif
13164                                 goto do_a_copy_in;
13165
13166                         }
13167                         if (sp->processing) {
13168                                 SCTP_TCB_SEND_UNLOCK(stcb);
13169                                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
13170                                 error = EINVAL;
13171                                 goto out;
13172                         } else {
13173                                 sp->processing = 1;
13174                         }
13175                 }
13176                 SCTP_TCB_SEND_UNLOCK(stcb);
13177                 while (uio->uio_resid > 0) {
13178                         /* How much room do we have? */
13179                         struct mbuf *new_tail, *mm;
13180
13181                         inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * SCTP_DATA_CHUNK_OVERHEAD(stcb));
13182                         if (SCTP_SB_LIMIT_SND(so) > inqueue_bytes)
13183                                 max_len = SCTP_SB_LIMIT_SND(so) - inqueue_bytes;
13184                         else
13185                                 max_len = 0;
13186
13187                         if ((max_len > (ssize_t)SCTP_BASE_SYSCTL(sctp_add_more_threshold)) ||
13188                             (max_len && (SCTP_SB_LIMIT_SND(so) < SCTP_BASE_SYSCTL(sctp_add_more_threshold))) ||
13189                             (uio->uio_resid && (uio->uio_resid <= max_len))) {
13190                                 sndout = 0;
13191                                 new_tail = NULL;
13192                                 if (hold_tcblock) {
13193                                         SCTP_TCB_UNLOCK(stcb);
13194                                         hold_tcblock = 0;
13195                                 }
13196                                 mm = sctp_copy_resume(uio, (int)max_len, user_marks_eor, &error, &sndout, &new_tail);
13197                                 if ((mm == NULL) || error) {
13198                                         if (mm) {
13199                                                 sctp_m_freem(mm);
13200                                         }
13201                                         SCTP_TCB_SEND_LOCK(stcb);
13202                                         if (sp != NULL) {
13203                                                 sp->processing = 0;
13204                                         }
13205                                         SCTP_TCB_SEND_UNLOCK(stcb);
13206                                         goto out;
13207                                 }
13208                                 /* Update the mbuf and count */
13209                                 SCTP_TCB_SEND_LOCK(stcb);
13210                                 if ((stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) ||
13211                                     (stcb->asoc.state & SCTP_STATE_WAS_ABORTED)) {
13212                                         /*
13213                                          * we need to get out. Peer probably
13214                                          * aborted.
13215                                          */
13216                                         sctp_m_freem(mm);
13217                                         if (stcb->asoc.state & SCTP_STATE_WAS_ABORTED) {
13218                                                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
13219                                                 error = ECONNRESET;
13220                                         }
13221                                         if (sp != NULL) {
13222                                                 sp->processing = 0;
13223                                         }
13224                                         SCTP_TCB_SEND_UNLOCK(stcb);
13225                                         goto out;
13226                                 }
13227                                 if (sp->tail_mbuf) {
13228                                         /* tack it to the end */
13229                                         SCTP_BUF_NEXT(sp->tail_mbuf) = mm;
13230                                         sp->tail_mbuf = new_tail;
13231                                 } else {
13232                                         /* A stolen mbuf */
13233                                         sp->data = mm;
13234                                         sp->tail_mbuf = new_tail;
13235                                 }
13236                                 sctp_snd_sb_alloc(stcb, sndout);
13237                                 atomic_add_int(&sp->length, sndout);
13238                                 len += sndout;
13239                                 if (sinfo_flags & SCTP_SACK_IMMEDIATELY) {
13240                                         sp->sinfo_flags |= SCTP_SACK_IMMEDIATELY;
13241                                 }
13242
13243                                 /* Did we reach EOR? */
13244                                 if ((uio->uio_resid == 0) &&
13245                                     ((user_marks_eor == 0) ||
13246                                     (sinfo_flags & SCTP_EOF) ||
13247                                     (user_marks_eor && (sinfo_flags & SCTP_EOR)))) {
13248                                         sp->msg_is_complete = 1;
13249                                 } else {
13250                                         sp->msg_is_complete = 0;
13251                                 }
13252                                 SCTP_TCB_SEND_UNLOCK(stcb);
13253                         }
13254                         if (uio->uio_resid == 0) {
13255                                 /* got it all? */
13256                                 continue;
13257                         }
13258                         /* PR-SCTP? */
13259                         if ((asoc->prsctp_supported) && (asoc->sent_queue_cnt_removeable > 0)) {
13260                                 /*
13261                                  * This is ugly but we must assure locking
13262                                  * order
13263                                  */
13264                                 if (hold_tcblock == 0) {
13265                                         SCTP_TCB_LOCK(stcb);
13266                                         hold_tcblock = 1;
13267                                 }
13268                                 sctp_prune_prsctp(stcb, asoc, srcv, (int)sndlen);
13269                                 inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * SCTP_DATA_CHUNK_OVERHEAD(stcb));
13270                                 if (SCTP_SB_LIMIT_SND(so) > inqueue_bytes)
13271                                         max_len = SCTP_SB_LIMIT_SND(so) - inqueue_bytes;
13272                                 else
13273                                         max_len = 0;
13274                                 if (max_len > 0) {
13275                                         continue;
13276                                 }
13277                                 SCTP_TCB_UNLOCK(stcb);
13278                                 hold_tcblock = 0;
13279                         }
13280                         /* wait for space now */
13281                         if (non_blocking) {
13282                                 /* Non-blocking io in place out */
13283                                 SCTP_TCB_SEND_LOCK(stcb);
13284                                 if (sp != NULL) {
13285                                         sp->processing = 0;
13286                                 }
13287                                 SCTP_TCB_SEND_UNLOCK(stcb);
13288                                 goto skip_out_eof;
13289                         }
13290                         /* What about the INIT, send it maybe */
13291                         if (queue_only_for_init) {
13292                                 if (hold_tcblock == 0) {
13293                                         SCTP_TCB_LOCK(stcb);
13294                                         hold_tcblock = 1;
13295                                 }
13296                                 if (SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) {
13297                                         /* a collision took us forward? */
13298                                         queue_only = 0;
13299                                 } else {
13300                                         sctp_send_initiate(inp, stcb, SCTP_SO_LOCKED);
13301                                         SCTP_SET_STATE(stcb, SCTP_STATE_COOKIE_WAIT);
13302                                         queue_only = 1;
13303                                 }
13304                         }
13305                         if ((net->flight_size > net->cwnd) &&
13306                             (asoc->sctp_cmt_on_off == 0)) {
13307                                 SCTP_STAT_INCR(sctps_send_cwnd_avoid);
13308                                 queue_only = 1;
13309                         } else if (asoc->ifp_had_enobuf) {
13310                                 SCTP_STAT_INCR(sctps_ifnomemqueued);
13311                                 if (net->flight_size > (2 * net->mtu)) {
13312                                         queue_only = 1;
13313                                 }
13314                                 asoc->ifp_had_enobuf = 0;
13315                         }
13316                         un_sent = stcb->asoc.total_output_queue_size - stcb->asoc.total_flight;
13317                         if ((sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY)) &&
13318                             (stcb->asoc.total_flight > 0) &&
13319                             (stcb->asoc.stream_queue_cnt < SCTP_MAX_DATA_BUNDLING) &&
13320                             (un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD))) {
13321
13322                                 /*-
13323                                  * Ok, Nagle is set on and we have data outstanding.
13324                                  * Don't send anything and let SACKs drive out the
13325                                  * data unless we have a "full" segment to send.
13326                                  */
13327                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
13328                                         sctp_log_nagle_event(stcb, SCTP_NAGLE_APPLIED);
13329                                 }
13330                                 SCTP_STAT_INCR(sctps_naglequeued);
13331                                 nagle_applies = 1;
13332                         } else {
13333                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
13334                                         if (sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY))
13335                                                 sctp_log_nagle_event(stcb, SCTP_NAGLE_SKIPPED);
13336                                 }
13337                                 SCTP_STAT_INCR(sctps_naglesent);
13338                                 nagle_applies = 0;
13339                         }
13340                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13341
13342                                 sctp_misc_ints(SCTP_CWNDLOG_PRESEND, queue_only_for_init, queue_only,
13343                                     nagle_applies, un_sent);
13344                                 sctp_misc_ints(SCTP_CWNDLOG_PRESEND, stcb->asoc.total_output_queue_size,
13345                                     stcb->asoc.total_flight,
13346                                     stcb->asoc.chunks_on_out_queue, stcb->asoc.total_flight_count);
13347                         }
13348                         if (queue_only_for_init)
13349                                 queue_only_for_init = 0;
13350                         if ((queue_only == 0) && (nagle_applies == 0)) {
13351                                 /*-
13352                                  * need to start chunk output
13353                                  * before blocking.. note that if
13354                                  * a lock is already applied, then
13355                                  * the input via the net is happening
13356                                  * and I don't need to start output :-D
13357                                  */
13358                                 if (hold_tcblock == 0) {
13359                                         if (SCTP_TCB_TRYLOCK(stcb)) {
13360                                                 hold_tcblock = 1;
13361                                                 sctp_chunk_output(inp,
13362                                                     stcb,
13363                                                     SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13364                                         }
13365                                 } else {
13366                                         sctp_chunk_output(inp,
13367                                             stcb,
13368                                             SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13369                                 }
13370                         }
13371                         if (hold_tcblock == 1) {
13372                                 SCTP_TCB_UNLOCK(stcb);
13373                                 hold_tcblock = 0;
13374                         }
13375                         SOCKBUF_LOCK(&so->so_snd);
13376                         /*-
13377                          * This is a bit strange, but I think it will
13378                          * work. The total_output_queue_size is locked and
13379                          * protected by the TCB_LOCK, which we just released.
13380                          * There is a race that can occur between releasing it
13381                          * above, and me getting the socket lock, where sacks
13382                          * come in but we have not put the SB_WAIT on the
13383                          * so_snd buffer to get the wakeup. After the LOCK
13384                          * is applied the sack_processing will also need to
13385                          * LOCK the so->so_snd to do the actual sowwakeup(). So
13386                          * once we have the socket buffer lock if we recheck the
13387                          * size we KNOW we will get to sleep safely with the
13388                          * wakeup flag in place.
13389                          */
13390                         inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * SCTP_DATA_CHUNK_OVERHEAD(stcb));
13391                         if (SCTP_SB_LIMIT_SND(so) <= (inqueue_bytes +
13392                             min(SCTP_BASE_SYSCTL(sctp_add_more_threshold), SCTP_SB_LIMIT_SND(so)))) {
13393                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13394                                         sctp_log_block(SCTP_BLOCK_LOG_INTO_BLK,
13395                                             asoc, uio->uio_resid);
13396                                 }
13397                                 be.error = 0;
13398                                 stcb->block_entry = &be;
13399                                 error = sbwait(&so->so_snd);
13400                                 stcb->block_entry = NULL;
13401
13402                                 if (error || so->so_error || be.error) {
13403                                         if (error == 0) {
13404                                                 if (so->so_error)
13405                                                         error = so->so_error;
13406                                                 if (be.error) {
13407                                                         error = be.error;
13408                                                 }
13409                                         }
13410                                         SOCKBUF_UNLOCK(&so->so_snd);
13411                                         SCTP_TCB_SEND_LOCK(stcb);
13412                                         if (sp != NULL) {
13413                                                 sp->processing = 0;
13414                                         }
13415                                         SCTP_TCB_SEND_UNLOCK(stcb);
13416                                         goto out_unlocked;
13417                                 }
13418
13419                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13420                                         sctp_log_block(SCTP_BLOCK_LOG_OUTOF_BLK,
13421                                             asoc, stcb->asoc.total_output_queue_size);
13422                                 }
13423                         }
13424                         SOCKBUF_UNLOCK(&so->so_snd);
13425                         SCTP_TCB_SEND_LOCK(stcb);
13426                         if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
13427                                 if (sp != NULL) {
13428                                         sp->processing = 0;
13429                                 }
13430                                 SCTP_TCB_SEND_UNLOCK(stcb);
13431                                 goto out_unlocked;
13432                         }
13433                         SCTP_TCB_SEND_UNLOCK(stcb);
13434                 }
13435                 SCTP_TCB_SEND_LOCK(stcb);
13436                 if ((stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) ||
13437                     (stcb->asoc.state & SCTP_STATE_WAS_ABORTED)) {
13438                         SCTP_TCB_SEND_UNLOCK(stcb);
13439                         goto out_unlocked;
13440                 }
13441                 if (sp) {
13442                         if (sp->msg_is_complete == 0) {
13443                                 strm->last_msg_incomplete = 1;
13444                                 if (stcb->asoc.idata_supported == 0) {
13445                                         asoc->stream_locked = 1;
13446                                         asoc->stream_locked_on = srcv->sinfo_stream;
13447                                 }
13448                         } else {
13449                                 sp->sender_all_done = 1;
13450                                 strm->last_msg_incomplete = 0;
13451                                 asoc->stream_locked = 0;
13452                         }
13453                         sp->processing = 0;
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 (sinfo_flags & SCTP_EOF) {
13468                         got_all_of_the_send = 1;
13469                 }
13470         }
13471         if (error) {
13472                 goto out;
13473         }
13474 dataless_eof:
13475         /* EOF thing ? */
13476         if ((sinfo_flags & SCTP_EOF) &&
13477             (got_all_of_the_send == 1)) {
13478                 SCTP_STAT_INCR(sctps_sends_with_eof);
13479                 error = 0;
13480                 if (hold_tcblock == 0) {
13481                         SCTP_TCB_LOCK(stcb);
13482                         hold_tcblock = 1;
13483                 }
13484                 if (TAILQ_EMPTY(&asoc->send_queue) &&
13485                     TAILQ_EMPTY(&asoc->sent_queue) &&
13486                     sctp_is_there_unsent_data(stcb, SCTP_SO_LOCKED) == 0) {
13487                         if ((*asoc->ss_functions.sctp_ss_is_user_msgs_incomplete) (stcb, asoc)) {
13488                                 goto abort_anyway;
13489                         }
13490                         /* there is nothing queued to send, so I'm done... */
13491                         if ((SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_SENT) &&
13492                             (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
13493                             (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
13494                                 struct sctp_nets *netp;
13495
13496                                 /* only send SHUTDOWN the first time through */
13497                                 if (SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) {
13498                                         SCTP_STAT_DECR_GAUGE32(sctps_currestab);
13499                                 }
13500                                 SCTP_SET_STATE(stcb, SCTP_STATE_SHUTDOWN_SENT);
13501                                 sctp_stop_timers_for_shutdown(stcb);
13502                                 if (stcb->asoc.alternate) {
13503                                         netp = stcb->asoc.alternate;
13504                                 } else {
13505                                         netp = stcb->asoc.primary_destination;
13506                                 }
13507                                 sctp_send_shutdown(stcb, netp);
13508                                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb,
13509                                     netp);
13510                                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
13511                                     NULL);
13512                         }
13513                 } else {
13514                         /*-
13515                          * we still got (or just got) data to send, so set
13516                          * SHUTDOWN_PENDING
13517                          */
13518                         /*-
13519                          * XXX sockets draft says that SCTP_EOF should be
13520                          * sent with no data.  currently, we will allow user
13521                          * data to be sent first and move to
13522                          * SHUTDOWN-PENDING
13523                          */
13524                         if ((SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_SENT) &&
13525                             (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
13526                             (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
13527                                 if (hold_tcblock == 0) {
13528                                         SCTP_TCB_LOCK(stcb);
13529                                         hold_tcblock = 1;
13530                                 }
13531                                 if ((*asoc->ss_functions.sctp_ss_is_user_msgs_incomplete) (stcb, asoc)) {
13532                                         SCTP_ADD_SUBSTATE(stcb, SCTP_STATE_PARTIAL_MSG_LEFT);
13533                                 }
13534                                 SCTP_ADD_SUBSTATE(stcb, SCTP_STATE_SHUTDOWN_PENDING);
13535                                 if (TAILQ_EMPTY(&asoc->send_queue) &&
13536                                     TAILQ_EMPTY(&asoc->sent_queue) &&
13537                                     (asoc->state & SCTP_STATE_PARTIAL_MSG_LEFT)) {
13538                                         struct mbuf *op_err;
13539                                         char msg[SCTP_DIAG_INFO_LEN];
13540
13541                         abort_anyway:
13542                                         if (free_cnt_applied) {
13543                                                 atomic_add_int(&stcb->asoc.refcnt, -1);
13544                                                 free_cnt_applied = 0;
13545                                         }
13546                                         SCTP_SNPRINTF(msg, sizeof(msg),
13547                                             "%s:%d at %s", __FILE__, __LINE__, __func__);
13548                                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
13549                                             msg);
13550                                         sctp_abort_an_association(stcb->sctp_ep, stcb,
13551                                             op_err, SCTP_SO_LOCKED);
13552                                         /*
13553                                          * now relock the stcb so everything
13554                                          * is sane
13555                                          */
13556                                         hold_tcblock = 0;
13557                                         stcb = NULL;
13558                                         goto out;
13559                                 }
13560                                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
13561                                     NULL);
13562                                 sctp_feature_off(inp, SCTP_PCB_FLAGS_NODELAY);
13563                         }
13564                 }
13565         }
13566 skip_out_eof:
13567         if (!TAILQ_EMPTY(&stcb->asoc.control_send_queue)) {
13568                 some_on_control = 1;
13569         }
13570         if (queue_only_for_init) {
13571                 if (hold_tcblock == 0) {
13572                         SCTP_TCB_LOCK(stcb);
13573                         hold_tcblock = 1;
13574                 }
13575                 if (SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) {
13576                         /* a collision took us forward? */
13577                         queue_only = 0;
13578                 } else {
13579                         sctp_send_initiate(inp, stcb, SCTP_SO_LOCKED);
13580                         SCTP_SET_STATE(stcb, SCTP_STATE_COOKIE_WAIT);
13581                         queue_only = 1;
13582                 }
13583         }
13584         if ((net->flight_size > net->cwnd) &&
13585             (stcb->asoc.sctp_cmt_on_off == 0)) {
13586                 SCTP_STAT_INCR(sctps_send_cwnd_avoid);
13587                 queue_only = 1;
13588         } else if (asoc->ifp_had_enobuf) {
13589                 SCTP_STAT_INCR(sctps_ifnomemqueued);
13590                 if (net->flight_size > (2 * net->mtu)) {
13591                         queue_only = 1;
13592                 }
13593                 asoc->ifp_had_enobuf = 0;
13594         }
13595         un_sent = stcb->asoc.total_output_queue_size - stcb->asoc.total_flight;
13596         if ((sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY)) &&
13597             (stcb->asoc.total_flight > 0) &&
13598             (stcb->asoc.stream_queue_cnt < SCTP_MAX_DATA_BUNDLING) &&
13599             (un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD))) {
13600                 /*-
13601                  * Ok, Nagle is set on and we have data outstanding.
13602                  * Don't send anything and let SACKs drive out the
13603                  * data unless wen have a "full" segment to send.
13604                  */
13605                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
13606                         sctp_log_nagle_event(stcb, SCTP_NAGLE_APPLIED);
13607                 }
13608                 SCTP_STAT_INCR(sctps_naglequeued);
13609                 nagle_applies = 1;
13610         } else {
13611                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
13612                         if (sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY))
13613                                 sctp_log_nagle_event(stcb, SCTP_NAGLE_SKIPPED);
13614                 }
13615                 SCTP_STAT_INCR(sctps_naglesent);
13616                 nagle_applies = 0;
13617         }
13618         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13619                 sctp_misc_ints(SCTP_CWNDLOG_PRESEND, queue_only_for_init, queue_only,
13620                     nagle_applies, un_sent);
13621                 sctp_misc_ints(SCTP_CWNDLOG_PRESEND, stcb->asoc.total_output_queue_size,
13622                     stcb->asoc.total_flight,
13623                     stcb->asoc.chunks_on_out_queue, stcb->asoc.total_flight_count);
13624         }
13625         if ((queue_only == 0) && (nagle_applies == 0) && (stcb->asoc.peers_rwnd && un_sent)) {
13626                 /* we can attempt to send too. */
13627                 if (hold_tcblock == 0) {
13628                         /*
13629                          * If there is activity recv'ing sacks no need to
13630                          * send
13631                          */
13632                         if (SCTP_TCB_TRYLOCK(stcb)) {
13633                                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13634                                 hold_tcblock = 1;
13635                         }
13636                 } else {
13637                         sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13638                 }
13639         } else if ((queue_only == 0) &&
13640                     (stcb->asoc.peers_rwnd == 0) &&
13641             (stcb->asoc.total_flight == 0)) {
13642                 /* We get to have a probe outstanding */
13643                 if (hold_tcblock == 0) {
13644                         hold_tcblock = 1;
13645                         SCTP_TCB_LOCK(stcb);
13646                 }
13647                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13648         } else if (some_on_control) {
13649                 int num_out, reason, frag_point;
13650
13651                 /* Here we do control only */
13652                 if (hold_tcblock == 0) {
13653                         hold_tcblock = 1;
13654                         SCTP_TCB_LOCK(stcb);
13655                 }
13656                 frag_point = sctp_get_frag_point(stcb, &stcb->asoc);
13657                 (void)sctp_med_chunk_output(inp, stcb, &stcb->asoc, &num_out,
13658                     &reason, 1, 1, &now, &now_filled, frag_point, SCTP_SO_LOCKED);
13659         }
13660         SCTPDBG(SCTP_DEBUG_OUTPUT1, "USR Send complete qo:%d prw:%d unsent:%d tf:%d cooq:%d toqs:%d err:%d\n",
13661             queue_only, stcb->asoc.peers_rwnd, un_sent,
13662             stcb->asoc.total_flight, stcb->asoc.chunks_on_out_queue,
13663             stcb->asoc.total_output_queue_size, error);
13664
13665 out:
13666 out_unlocked:
13667
13668         if (local_soresv && stcb) {
13669                 atomic_subtract_int(&stcb->asoc.sb_send_resv, sndlen);
13670         }
13671         if (create_lock_applied) {
13672                 SCTP_ASOC_CREATE_UNLOCK(inp);
13673         }
13674         if ((stcb) && hold_tcblock) {
13675                 SCTP_TCB_UNLOCK(stcb);
13676         }
13677         if (stcb && free_cnt_applied) {
13678                 atomic_add_int(&stcb->asoc.refcnt, -1);
13679         }
13680 #ifdef INVARIANTS
13681         if (stcb) {
13682                 if (mtx_owned(&stcb->tcb_mtx)) {
13683                         panic("Leaving with tcb mtx owned?");
13684                 }
13685                 if (mtx_owned(&stcb->tcb_send_mtx)) {
13686                         panic("Leaving with tcb send mtx owned?");
13687                 }
13688         }
13689 #endif
13690         if (top) {
13691                 sctp_m_freem(top);
13692         }
13693         if (control) {
13694                 sctp_m_freem(control);
13695         }
13696         return (error);
13697 }
13698
13699
13700 /*
13701  * generate an AUTHentication chunk, if required
13702  */
13703 struct mbuf *
13704 sctp_add_auth_chunk(struct mbuf *m, struct mbuf **m_end,
13705     struct sctp_auth_chunk **auth_ret, uint32_t *offset,
13706     struct sctp_tcb *stcb, uint8_t chunk)
13707 {
13708         struct mbuf *m_auth;
13709         struct sctp_auth_chunk *auth;
13710         int chunk_len;
13711         struct mbuf *cn;
13712
13713         if ((m_end == NULL) || (auth_ret == NULL) || (offset == NULL) ||
13714             (stcb == NULL))
13715                 return (m);
13716
13717         if (stcb->asoc.auth_supported == 0) {
13718                 return (m);
13719         }
13720         /* does the requested chunk require auth? */
13721         if (!sctp_auth_is_required_chunk(chunk, stcb->asoc.peer_auth_chunks)) {
13722                 return (m);
13723         }
13724         m_auth = sctp_get_mbuf_for_msg(sizeof(*auth), 0, M_NOWAIT, 1, MT_HEADER);
13725         if (m_auth == NULL) {
13726                 /* no mbuf's */
13727                 return (m);
13728         }
13729         /* reserve some space if this will be the first mbuf */
13730         if (m == NULL)
13731                 SCTP_BUF_RESV_UF(m_auth, SCTP_MIN_OVERHEAD);
13732         /* fill in the AUTH chunk details */
13733         auth = mtod(m_auth, struct sctp_auth_chunk *);
13734         memset(auth, 0, sizeof(*auth));
13735         auth->ch.chunk_type = SCTP_AUTHENTICATION;
13736         auth->ch.chunk_flags = 0;
13737         chunk_len = sizeof(*auth) +
13738             sctp_get_hmac_digest_len(stcb->asoc.peer_hmac_id);
13739         auth->ch.chunk_length = htons(chunk_len);
13740         auth->hmac_id = htons(stcb->asoc.peer_hmac_id);
13741         /* key id and hmac digest will be computed and filled in upon send */
13742
13743         /* save the offset where the auth was inserted into the chain */
13744         *offset = 0;
13745         for (cn = m; cn; cn = SCTP_BUF_NEXT(cn)) {
13746                 *offset += SCTP_BUF_LEN(cn);
13747         }
13748
13749         /* update length and return pointer to the auth chunk */
13750         SCTP_BUF_LEN(m_auth) = chunk_len;
13751         m = sctp_copy_mbufchain(m_auth, m, m_end, 1, chunk_len, 0);
13752         if (auth_ret != NULL)
13753                 *auth_ret = auth;
13754
13755         return (m);
13756 }
13757
13758 #ifdef INET6
13759 int
13760 sctp_v6src_match_nexthop(struct sockaddr_in6 *src6, sctp_route_t *ro)
13761 {
13762         struct nd_prefix *pfx = NULL;
13763         struct nd_pfxrouter *pfxrtr = NULL;
13764         struct sockaddr_in6 gw6;
13765
13766         if (ro == NULL || ro->ro_rt == NULL || src6->sin6_family != AF_INET6)
13767                 return (0);
13768
13769         /* get prefix entry of address */
13770         ND6_RLOCK();
13771         LIST_FOREACH(pfx, &MODULE_GLOBAL(nd_prefix), ndpr_entry) {
13772                 if (pfx->ndpr_stateflags & NDPRF_DETACHED)
13773                         continue;
13774                 if (IN6_ARE_MASKED_ADDR_EQUAL(&pfx->ndpr_prefix.sin6_addr,
13775                     &src6->sin6_addr, &pfx->ndpr_mask))
13776                         break;
13777         }
13778         /* no prefix entry in the prefix list */
13779         if (pfx == NULL) {
13780                 ND6_RUNLOCK();
13781                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "No prefix entry for ");
13782                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)src6);
13783                 return (0);
13784         }
13785
13786         SCTPDBG(SCTP_DEBUG_OUTPUT2, "v6src_match_nexthop(), Prefix entry is ");
13787         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)src6);
13788
13789         /* search installed gateway from prefix entry */
13790         LIST_FOREACH(pfxrtr, &pfx->ndpr_advrtrs, pfr_entry) {
13791                 memset(&gw6, 0, sizeof(struct sockaddr_in6));
13792                 gw6.sin6_family = AF_INET6;
13793                 gw6.sin6_len = sizeof(struct sockaddr_in6);
13794                 memcpy(&gw6.sin6_addr, &pfxrtr->router->rtaddr,
13795                     sizeof(struct in6_addr));
13796                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "prefix router is ");
13797                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)&gw6);
13798                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "installed router is ");
13799                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, ro->ro_rt->rt_gateway);
13800                 if (sctp_cmpaddr((struct sockaddr *)&gw6, ro->ro_rt->rt_gateway)) {
13801                         ND6_RUNLOCK();
13802                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "pfxrouter is installed\n");
13803                         return (1);
13804                 }
13805         }
13806         ND6_RUNLOCK();
13807         SCTPDBG(SCTP_DEBUG_OUTPUT2, "pfxrouter is not installed\n");
13808         return (0);
13809 }
13810 #endif
13811
13812 int
13813 sctp_v4src_match_nexthop(struct sctp_ifa *sifa, sctp_route_t *ro)
13814 {
13815 #ifdef INET
13816         struct sockaddr_in *sin, *mask;
13817         struct ifaddr *ifa;
13818         struct in_addr srcnetaddr, gwnetaddr;
13819
13820         if (ro == NULL || ro->ro_rt == NULL ||
13821             sifa->address.sa.sa_family != AF_INET) {
13822                 return (0);
13823         }
13824         ifa = (struct ifaddr *)sifa->ifa;
13825         mask = (struct sockaddr_in *)(ifa->ifa_netmask);
13826         sin = &sifa->address.sin;
13827         srcnetaddr.s_addr = (sin->sin_addr.s_addr & mask->sin_addr.s_addr);
13828         SCTPDBG(SCTP_DEBUG_OUTPUT1, "match_nexthop4: src address is ");
13829         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, &sifa->address.sa);
13830         SCTPDBG(SCTP_DEBUG_OUTPUT1, "network address is %x\n", srcnetaddr.s_addr);
13831
13832         sin = (struct sockaddr_in *)ro->ro_rt->rt_gateway;
13833         gwnetaddr.s_addr = (sin->sin_addr.s_addr & mask->sin_addr.s_addr);
13834         SCTPDBG(SCTP_DEBUG_OUTPUT1, "match_nexthop4: nexthop is ");
13835         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, ro->ro_rt->rt_gateway);
13836         SCTPDBG(SCTP_DEBUG_OUTPUT1, "network address is %x\n", gwnetaddr.s_addr);
13837         if (srcnetaddr.s_addr == gwnetaddr.s_addr) {
13838                 return (1);
13839         }
13840 #endif
13841         return (0);
13842 }