sys/netinet/sctp_output.c

   1 /*-
   2  * SPDX-License-Identifier: BSD-3-Clause
   3  *
   4  * Copyright (c) 2001-2008, by Cisco Systems, Inc. All rights reserved.
   5  * Copyright (c) 2008-2012, by Randall Stewart. All rights reserved.
   6  * Copyright (c) 2008-2012, by Michael Tuexen. All rights reserved.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions are met:
  10  *
  11  * a) Redistributions of source code must retain the above copyright notice,
  12  *    this list of conditions and the following disclaimer.
  13  *
  14  * b) Redistributions in binary form must reproduce the above copyright
  15  *    notice, this list of conditions and the following disclaimer in
  16  *    the documentation and/or other materials provided with the distribution.
  17  *
  18  * c) Neither the name of Cisco Systems, Inc. nor the names of its
  19  *    contributors may be used to endorse or promote products derived
  20  *    from this software without specific prior written permission.
  21  *
  22  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  23  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
  24  * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  25  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
  26  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  27  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  28  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  29  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  30  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  31  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
  32  * THE POSSIBILITY OF SUCH DAMAGE.
  33  */
  34
  35 #include <sys/cdefs.h>
  36 __FBSDID("$FreeBSD$");
  37
  38 #include <netinet/sctp_os.h>
  39 #include <sys/proc.h>
  40 #include <netinet/sctp_var.h>
  41 #include <netinet/sctp_sysctl.h>
  42 #include <netinet/sctp_header.h>
  43 #include <netinet/sctp_pcb.h>
  44 #include <netinet/sctputil.h>
  45 #include <netinet/sctp_output.h>
  46 #include <netinet/sctp_uio.h>
  47 #include <netinet/sctputil.h>
  48 #include <netinet/sctp_auth.h>
  49 #include <netinet/sctp_timer.h>
  50 #include <netinet/sctp_asconf.h>
  51 #include <netinet/sctp_indata.h>
  52 #include <netinet/sctp_bsd_addr.h>
  53 #include <netinet/sctp_input.h>
  54 #include <netinet/sctp_crc32.h>
  55 #if defined(INET) || defined(INET6)
  56 #include <netinet/udp.h>
  57 #endif
  58 #include <netinet/udp_var.h>
  59 #include <machine/in_cksum.h>
  60
  61
  62
  63 #define SCTP_MAX_GAPS_INARRAY 4
  64 struct sack_track {
  65         uint8_t right_edge;     /* mergable on the right edge */
  66         uint8_t left_edge;      /* mergable on the left edge */
  67         uint8_t num_entries;
  68         uint8_t spare;
  69         struct sctp_gap_ack_block gaps[SCTP_MAX_GAPS_INARRAY];
  70 };
  71
  72 const struct sack_track sack_array[256] = {
  73         {0, 0, 0, 0,            /* 0x00 */
  74                 {{0, 0},
  75                 {0, 0},
  76                 {0, 0},
  77                 {0, 0}
  78                 }
  79         },
  80         {1, 0, 1, 0,            /* 0x01 */
  81                 {{0, 0},
  82                 {0, 0},
  83                 {0, 0},
  84                 {0, 0}
  85                 }
  86         },
  87         {0, 0, 1, 0,            /* 0x02 */
  88                 {{1, 1},
  89                 {0, 0},
  90                 {0, 0},
  91                 {0, 0}
  92                 }
  93         },
  94         {1, 0, 1, 0,            /* 0x03 */
  95                 {{0, 1},
  96                 {0, 0},
  97                 {0, 0},
  98                 {0, 0}
  99                 }
 100         },
 101         {0, 0, 1, 0,            /* 0x04 */
 102                 {{2, 2},
 103                 {0, 0},
 104                 {0, 0},
 105                 {0, 0}
 106                 }
 107         },
 108         {1, 0, 2, 0,            /* 0x05 */
 109                 {{0, 0},
 110                 {2, 2},
 111                 {0, 0},
 112                 {0, 0}
 113                 }
 114         },
 115         {0, 0, 1, 0,            /* 0x06 */
 116                 {{1, 2},
 117                 {0, 0},
 118                 {0, 0},
 119                 {0, 0}
 120                 }
 121         },
 122         {1, 0, 1, 0,            /* 0x07 */
 123                 {{0, 2},
 124                 {0, 0},
 125                 {0, 0},
 126                 {0, 0}
 127                 }
 128         },
 129         {0, 0, 1, 0,            /* 0x08 */
 130                 {{3, 3},
 131                 {0, 0},
 132                 {0, 0},
 133                 {0, 0}
 134                 }
 135         },
 136         {1, 0, 2, 0,            /* 0x09 */
 137                 {{0, 0},
 138                 {3, 3},
 139                 {0, 0},
 140                 {0, 0}
 141                 }
 142         },
 143         {0, 0, 2, 0,            /* 0x0a */
 144                 {{1, 1},
 145                 {3, 3},
 146                 {0, 0},
 147                 {0, 0}
 148                 }
 149         },
 150         {1, 0, 2, 0,            /* 0x0b */
 151                 {{0, 1},
 152                 {3, 3},
 153                 {0, 0},
 154                 {0, 0}
 155                 }
 156         },
 157         {0, 0, 1, 0,            /* 0x0c */
 158                 {{2, 3},
 159                 {0, 0},
 160                 {0, 0},
 161                 {0, 0}
 162                 }
 163         },
 164         {1, 0, 2, 0,            /* 0x0d */
 165                 {{0, 0},
 166                 {2, 3},
 167                 {0, 0},
 168                 {0, 0}
 169                 }
 170         },
 171         {0, 0, 1, 0,            /* 0x0e */
 172                 {{1, 3},
 173                 {0, 0},
 174                 {0, 0},
 175                 {0, 0}
 176                 }
 177         },
 178         {1, 0, 1, 0,            /* 0x0f */
 179                 {{0, 3},
 180                 {0, 0},
 181                 {0, 0},
 182                 {0, 0}
 183                 }
 184         },
 185         {0, 0, 1, 0,            /* 0x10 */
 186                 {{4, 4},
 187                 {0, 0},
 188                 {0, 0},
 189                 {0, 0}
 190                 }
 191         },
 192         {1, 0, 2, 0,            /* 0x11 */
 193                 {{0, 0},
 194                 {4, 4},
 195                 {0, 0},
 196                 {0, 0}
 197                 }
 198         },
 199         {0, 0, 2, 0,            /* 0x12 */
 200                 {{1, 1},
 201                 {4, 4},
 202                 {0, 0},
 203                 {0, 0}
 204                 }
 205         },
 206         {1, 0, 2, 0,            /* 0x13 */
 207                 {{0, 1},
 208                 {4, 4},
 209                 {0, 0},
 210                 {0, 0}
 211                 }
 212         },
 213         {0, 0, 2, 0,            /* 0x14 */
 214                 {{2, 2},
 215                 {4, 4},
 216                 {0, 0},
 217                 {0, 0}
 218                 }
 219         },
 220         {1, 0, 3, 0,            /* 0x15 */
 221                 {{0, 0},
 222                 {2, 2},
 223                 {4, 4},
 224                 {0, 0}
 225                 }
 226         },
 227         {0, 0, 2, 0,            /* 0x16 */
 228                 {{1, 2},
 229                 {4, 4},
 230                 {0, 0},
 231                 {0, 0}
 232                 }
 233         },
 234         {1, 0, 2, 0,            /* 0x17 */
 235                 {{0, 2},
 236                 {4, 4},
 237                 {0, 0},
 238                 {0, 0}
 239                 }
 240         },
 241         {0, 0, 1, 0,            /* 0x18 */
 242                 {{3, 4},
 243                 {0, 0},
 244                 {0, 0},
 245                 {0, 0}
 246                 }
 247         },
 248         {1, 0, 2, 0,            /* 0x19 */
 249                 {{0, 0},
 250                 {3, 4},
 251                 {0, 0},
 252                 {0, 0}
 253                 }
 254         },
 255         {0, 0, 2, 0,            /* 0x1a */
 256                 {{1, 1},
 257                 {3, 4},
 258                 {0, 0},
 259                 {0, 0}
 260                 }
 261         },
 262         {1, 0, 2, 0,            /* 0x1b */
 263                 {{0, 1},
 264                 {3, 4},
 265                 {0, 0},
 266                 {0, 0}
 267                 }
 268         },
 269         {0, 0, 1, 0,            /* 0x1c */
 270                 {{2, 4},
 271                 {0, 0},
 272                 {0, 0},
 273                 {0, 0}
 274                 }
 275         },
 276         {1, 0, 2, 0,            /* 0x1d */
 277                 {{0, 0},
 278                 {2, 4},
 279                 {0, 0},
 280                 {0, 0}
 281                 }
 282         },
 283         {0, 0, 1, 0,            /* 0x1e */
 284                 {{1, 4},
 285                 {0, 0},
 286                 {0, 0},
 287                 {0, 0}
 288                 }
 289         },
 290         {1, 0, 1, 0,            /* 0x1f */
 291                 {{0, 4},
 292                 {0, 0},
 293                 {0, 0},
 294                 {0, 0}
 295                 }
 296         },
 297         {0, 0, 1, 0,            /* 0x20 */
 298                 {{5, 5},
 299                 {0, 0},
 300                 {0, 0},
 301                 {0, 0}
 302                 }
 303         },
 304         {1, 0, 2, 0,            /* 0x21 */
 305                 {{0, 0},
 306                 {5, 5},
 307                 {0, 0},
 308                 {0, 0}
 309                 }
 310         },
 311         {0, 0, 2, 0,            /* 0x22 */
 312                 {{1, 1},
 313                 {5, 5},
 314                 {0, 0},
 315                 {0, 0}
 316                 }
 317         },
 318         {1, 0, 2, 0,            /* 0x23 */
 319                 {{0, 1},
 320                 {5, 5},
 321                 {0, 0},
 322                 {0, 0}
 323                 }
 324         },
 325         {0, 0, 2, 0,            /* 0x24 */
 326                 {{2, 2},
 327                 {5, 5},
 328                 {0, 0},
 329                 {0, 0}
 330                 }
 331         },
 332         {1, 0, 3, 0,            /* 0x25 */
 333                 {{0, 0},
 334                 {2, 2},
 335                 {5, 5},
 336                 {0, 0}
 337                 }
 338         },
 339         {0, 0, 2, 0,            /* 0x26 */
 340                 {{1, 2},
 341                 {5, 5},
 342                 {0, 0},
 343                 {0, 0}
 344                 }
 345         },
 346         {1, 0, 2, 0,            /* 0x27 */
 347                 {{0, 2},
 348                 {5, 5},
 349                 {0, 0},
 350                 {0, 0}
 351                 }
 352         },
 353         {0, 0, 2, 0,            /* 0x28 */
 354                 {{3, 3},
 355                 {5, 5},
 356                 {0, 0},
 357                 {0, 0}
 358                 }
 359         },
 360         {1, 0, 3, 0,            /* 0x29 */
 361                 {{0, 0},
 362                 {3, 3},
 363                 {5, 5},
 364                 {0, 0}
 365                 }
 366         },
 367         {0, 0, 3, 0,            /* 0x2a */
 368                 {{1, 1},
 369                 {3, 3},
 370                 {5, 5},
 371                 {0, 0}
 372                 }
 373         },
 374         {1, 0, 3, 0,            /* 0x2b */
 375                 {{0, 1},
 376                 {3, 3},
 377                 {5, 5},
 378                 {0, 0}
 379                 }
 380         },
 381         {0, 0, 2, 0,            /* 0x2c */
 382                 {{2, 3},
 383                 {5, 5},
 384                 {0, 0},
 385                 {0, 0}
 386                 }
 387         },
 388         {1, 0, 3, 0,            /* 0x2d */
 389                 {{0, 0},
 390                 {2, 3},
 391                 {5, 5},
 392                 {0, 0}
 393                 }
 394         },
 395         {0, 0, 2, 0,            /* 0x2e */
 396                 {{1, 3},
 397                 {5, 5},
 398                 {0, 0},
 399                 {0, 0}
 400                 }
 401         },
 402         {1, 0, 2, 0,            /* 0x2f */
 403                 {{0, 3},
 404                 {5, 5},
 405                 {0, 0},
 406                 {0, 0}
 407                 }
 408         },
 409         {0, 0, 1, 0,            /* 0x30 */
 410                 {{4, 5},
 411                 {0, 0},
 412                 {0, 0},
 413                 {0, 0}
 414                 }
 415         },
 416         {1, 0, 2, 0,            /* 0x31 */
 417                 {{0, 0},
 418                 {4, 5},
 419                 {0, 0},
 420                 {0, 0}
 421                 }
 422         },
 423         {0, 0, 2, 0,            /* 0x32 */
 424                 {{1, 1},
 425                 {4, 5},
 426                 {0, 0},
 427                 {0, 0}
 428                 }
 429         },
 430         {1, 0, 2, 0,            /* 0x33 */
 431                 {{0, 1},
 432                 {4, 5},
 433                 {0, 0},
 434                 {0, 0}
 435                 }
 436         },
 437         {0, 0, 2, 0,            /* 0x34 */
 438                 {{2, 2},
 439                 {4, 5},
 440                 {0, 0},
 441                 {0, 0}
 442                 }
 443         },
 444         {1, 0, 3, 0,            /* 0x35 */
 445                 {{0, 0},
 446                 {2, 2},
 447                 {4, 5},
 448                 {0, 0}
 449                 }
 450         },
 451         {0, 0, 2, 0,            /* 0x36 */
 452                 {{1, 2},
 453                 {4, 5},
 454                 {0, 0},
 455                 {0, 0}
 456                 }
 457         },
 458         {1, 0, 2, 0,            /* 0x37 */
 459                 {{0, 2},
 460                 {4, 5},
 461                 {0, 0},
 462                 {0, 0}
 463                 }
 464         },
 465         {0, 0, 1, 0,            /* 0x38 */
 466                 {{3, 5},
 467                 {0, 0},
 468                 {0, 0},
 469                 {0, 0}
 470                 }
 471         },
 472         {1, 0, 2, 0,            /* 0x39 */
 473                 {{0, 0},
 474                 {3, 5},
 475                 {0, 0},
 476                 {0, 0}
 477                 }
 478         },
 479         {0, 0, 2, 0,            /* 0x3a */
 480                 {{1, 1},
 481                 {3, 5},
 482                 {0, 0},
 483                 {0, 0}
 484                 }
 485         },
 486         {1, 0, 2, 0,            /* 0x3b */
 487                 {{0, 1},
 488                 {3, 5},
 489                 {0, 0},
 490                 {0, 0}
 491                 }
 492         },
 493         {0, 0, 1, 0,            /* 0x3c */
 494                 {{2, 5},
 495                 {0, 0},
 496                 {0, 0},
 497                 {0, 0}
 498                 }
 499         },
 500         {1, 0, 2, 0,            /* 0x3d */
 501                 {{0, 0},
 502                 {2, 5},
 503                 {0, 0},
 504                 {0, 0}
 505                 }
 506         },
 507         {0, 0, 1, 0,            /* 0x3e */
 508                 {{1, 5},
 509                 {0, 0},
 510                 {0, 0},
 511                 {0, 0}
 512                 }
 513         },
 514         {1, 0, 1, 0,            /* 0x3f */
 515                 {{0, 5},
 516                 {0, 0},
 517                 {0, 0},
 518                 {0, 0}
 519                 }
 520         },
 521         {0, 0, 1, 0,            /* 0x40 */
 522                 {{6, 6},
 523                 {0, 0},
 524                 {0, 0},
 525                 {0, 0}
 526                 }
 527         },
 528         {1, 0, 2, 0,            /* 0x41 */
 529                 {{0, 0},
 530                 {6, 6},
 531                 {0, 0},
 532                 {0, 0}
 533                 }
 534         },
 535         {0, 0, 2, 0,            /* 0x42 */
 536                 {{1, 1},
 537                 {6, 6},
 538                 {0, 0},
 539                 {0, 0}
 540                 }
 541         },
 542         {1, 0, 2, 0,            /* 0x43 */
 543                 {{0, 1},
 544                 {6, 6},
 545                 {0, 0},
 546                 {0, 0}
 547                 }
 548         },
 549         {0, 0, 2, 0,            /* 0x44 */
 550                 {{2, 2},
 551                 {6, 6},
 552                 {0, 0},
 553                 {0, 0}
 554                 }
 555         },
 556         {1, 0, 3, 0,            /* 0x45 */
 557                 {{0, 0},
 558                 {2, 2},
 559                 {6, 6},
 560                 {0, 0}
 561                 }
 562         },
 563         {0, 0, 2, 0,            /* 0x46 */
 564                 {{1, 2},
 565                 {6, 6},
 566                 {0, 0},
 567                 {0, 0}
 568                 }
 569         },
 570         {1, 0, 2, 0,            /* 0x47 */
 571                 {{0, 2},
 572                 {6, 6},
 573                 {0, 0},
 574                 {0, 0}
 575                 }
 576         },
 577         {0, 0, 2, 0,            /* 0x48 */
 578                 {{3, 3},
 579                 {6, 6},
 580                 {0, 0},
 581                 {0, 0}
 582                 }
 583         },
 584         {1, 0, 3, 0,            /* 0x49 */
 585                 {{0, 0},
 586                 {3, 3},
 587                 {6, 6},
 588                 {0, 0}
 589                 }
 590         },
 591         {0, 0, 3, 0,            /* 0x4a */
 592                 {{1, 1},
 593                 {3, 3},
 594                 {6, 6},
 595                 {0, 0}
 596                 }
 597         },
 598         {1, 0, 3, 0,            /* 0x4b */
 599                 {{0, 1},
 600                 {3, 3},
 601                 {6, 6},
 602                 {0, 0}
 603                 }
 604         },
 605         {0, 0, 2, 0,            /* 0x4c */
 606                 {{2, 3},
 607                 {6, 6},
 608                 {0, 0},
 609                 {0, 0}
 610                 }
 611         },
 612         {1, 0, 3, 0,            /* 0x4d */
 613                 {{0, 0},
 614                 {2, 3},
 615                 {6, 6},
 616                 {0, 0}
 617                 }
 618         },
 619         {0, 0, 2, 0,            /* 0x4e */
 620                 {{1, 3},
 621                 {6, 6},
 622                 {0, 0},
 623                 {0, 0}
 624                 }
 625         },
 626         {1, 0, 2, 0,            /* 0x4f */
 627                 {{0, 3},
 628                 {6, 6},
 629                 {0, 0},
 630                 {0, 0}
 631                 }
 632         },
 633         {0, 0, 2, 0,            /* 0x50 */
 634                 {{4, 4},
 635                 {6, 6},
 636                 {0, 0},
 637                 {0, 0}
 638                 }
 639         },
 640         {1, 0, 3, 0,            /* 0x51 */
 641                 {{0, 0},
 642                 {4, 4},
 643                 {6, 6},
 644                 {0, 0}
 645                 }
 646         },
 647         {0, 0, 3, 0,            /* 0x52 */
 648                 {{1, 1},
 649                 {4, 4},
 650                 {6, 6},
 651                 {0, 0}
 652                 }
 653         },
 654         {1, 0, 3, 0,            /* 0x53 */
 655                 {{0, 1},
 656                 {4, 4},
 657                 {6, 6},
 658                 {0, 0}
 659                 }
 660         },
 661         {0, 0, 3, 0,            /* 0x54 */
 662                 {{2, 2},
 663                 {4, 4},
 664                 {6, 6},
 665                 {0, 0}
 666                 }
 667         },
 668         {1, 0, 4, 0,            /* 0x55 */
 669                 {{0, 0},
 670                 {2, 2},
 671                 {4, 4},
 672                 {6, 6}
 673                 }
 674         },
 675         {0, 0, 3, 0,            /* 0x56 */
 676                 {{1, 2},
 677                 {4, 4},
 678                 {6, 6},
 679                 {0, 0}
 680                 }
 681         },
 682         {1, 0, 3, 0,            /* 0x57 */
 683                 {{0, 2},
 684                 {4, 4},
 685                 {6, 6},
 686                 {0, 0}
 687                 }
 688         },
 689         {0, 0, 2, 0,            /* 0x58 */
 690                 {{3, 4},
 691                 {6, 6},
 692                 {0, 0},
 693                 {0, 0}
 694                 }
 695         },
 696         {1, 0, 3, 0,            /* 0x59 */
 697                 {{0, 0},
 698                 {3, 4},
 699                 {6, 6},
 700                 {0, 0}
 701                 }
 702         },
 703         {0, 0, 3, 0,            /* 0x5a */
 704                 {{1, 1},
 705                 {3, 4},
 706                 {6, 6},
 707                 {0, 0}
 708                 }
 709         },
 710         {1, 0, 3, 0,            /* 0x5b */
 711                 {{0, 1},
 712                 {3, 4},
 713                 {6, 6},
 714                 {0, 0}
 715                 }
 716         },
 717         {0, 0, 2, 0,            /* 0x5c */
 718                 {{2, 4},
 719                 {6, 6},
 720                 {0, 0},
 721                 {0, 0}
 722                 }
 723         },
 724         {1, 0, 3, 0,            /* 0x5d */
 725                 {{0, 0},
 726                 {2, 4},
 727                 {6, 6},
 728                 {0, 0}
 729                 }
 730         },
 731         {0, 0, 2, 0,            /* 0x5e */
 732                 {{1, 4},
 733                 {6, 6},
 734                 {0, 0},
 735                 {0, 0}
 736                 }
 737         },
 738         {1, 0, 2, 0,            /* 0x5f */
 739                 {{0, 4},
 740                 {6, 6},
 741                 {0, 0},
 742                 {0, 0}
 743                 }
 744         },
 745         {0, 0, 1, 0,            /* 0x60 */
 746                 {{5, 6},
 747                 {0, 0},
 748                 {0, 0},
 749                 {0, 0}
 750                 }
 751         },
 752         {1, 0, 2, 0,            /* 0x61 */
 753                 {{0, 0},
 754                 {5, 6},
 755                 {0, 0},
 756                 {0, 0}
 757                 }
 758         },
 759         {0, 0, 2, 0,            /* 0x62 */
 760                 {{1, 1},
 761                 {5, 6},
 762                 {0, 0},
 763                 {0, 0}
 764                 }
 765         },
 766         {1, 0, 2, 0,            /* 0x63 */
 767                 {{0, 1},
 768                 {5, 6},
 769                 {0, 0},
 770                 {0, 0}
 771                 }
 772         },
 773         {0, 0, 2, 0,            /* 0x64 */
 774                 {{2, 2},
 775                 {5, 6},
 776                 {0, 0},
 777                 {0, 0}
 778                 }
 779         },
 780         {1, 0, 3, 0,            /* 0x65 */
 781                 {{0, 0},
 782                 {2, 2},
 783                 {5, 6},
 784                 {0, 0}
 785                 }
 786         },
 787         {0, 0, 2, 0,            /* 0x66 */
 788                 {{1, 2},
 789                 {5, 6},
 790                 {0, 0},
 791                 {0, 0}
 792                 }
 793         },
 794         {1, 0, 2, 0,            /* 0x67 */
 795                 {{0, 2},
 796                 {5, 6},
 797                 {0, 0},
 798                 {0, 0}
 799                 }
 800         },
 801         {0, 0, 2, 0,            /* 0x68 */
 802                 {{3, 3},
 803                 {5, 6},
 804                 {0, 0},
 805                 {0, 0}
 806                 }
 807         },
 808         {1, 0, 3, 0,            /* 0x69 */
 809                 {{0, 0},
 810                 {3, 3},
 811                 {5, 6},
 812                 {0, 0}
 813                 }
 814         },
 815         {0, 0, 3, 0,            /* 0x6a */
 816                 {{1, 1},
 817                 {3, 3},
 818                 {5, 6},
 819                 {0, 0}
 820                 }
 821         },
 822         {1, 0, 3, 0,            /* 0x6b */
 823                 {{0, 1},
 824                 {3, 3},
 825                 {5, 6},
 826                 {0, 0}
 827                 }
 828         },
 829         {0, 0, 2, 0,            /* 0x6c */
 830                 {{2, 3},
 831                 {5, 6},
 832                 {0, 0},
 833                 {0, 0}
 834                 }
 835         },
 836         {1, 0, 3, 0,            /* 0x6d */
 837                 {{0, 0},
 838                 {2, 3},
 839                 {5, 6},
 840                 {0, 0}
 841                 }
 842         },
 843         {0, 0, 2, 0,            /* 0x6e */
 844                 {{1, 3},
 845                 {5, 6},
 846                 {0, 0},
 847                 {0, 0}
 848                 }
 849         },
 850         {1, 0, 2, 0,            /* 0x6f */
 851                 {{0, 3},
 852                 {5, 6},
 853                 {0, 0},
 854                 {0, 0}
 855                 }
 856         },
 857         {0, 0, 1, 0,            /* 0x70 */
 858                 {{4, 6},
 859                 {0, 0},
 860                 {0, 0},
 861                 {0, 0}
 862                 }
 863         },
 864         {1, 0, 2, 0,            /* 0x71 */
 865                 {{0, 0},
 866                 {4, 6},
 867                 {0, 0},
 868                 {0, 0}
 869                 }
 870         },
 871         {0, 0, 2, 0,            /* 0x72 */
 872                 {{1, 1},
 873                 {4, 6},
 874                 {0, 0},
 875                 {0, 0}
 876                 }
 877         },
 878         {1, 0, 2, 0,            /* 0x73 */
 879                 {{0, 1},
 880                 {4, 6},
 881                 {0, 0},
 882                 {0, 0}
 883                 }
 884         },
 885         {0, 0, 2, 0,            /* 0x74 */
 886                 {{2, 2},
 887                 {4, 6},
 888                 {0, 0},
 889                 {0, 0}
 890                 }
 891         },
 892         {1, 0, 3, 0,            /* 0x75 */
 893                 {{0, 0},
 894                 {2, 2},
 895                 {4, 6},
 896                 {0, 0}
 897                 }
 898         },
 899         {0, 0, 2, 0,            /* 0x76 */
 900                 {{1, 2},
 901                 {4, 6},
 902                 {0, 0},
 903                 {0, 0}
 904                 }
 905         },
 906         {1, 0, 2, 0,            /* 0x77 */
 907                 {{0, 2},
 908                 {4, 6},
 909                 {0, 0},
 910                 {0, 0}
 911                 }
 912         },
 913         {0, 0, 1, 0,            /* 0x78 */
 914                 {{3, 6},
 915                 {0, 0},
 916                 {0, 0},
 917                 {0, 0}
 918                 }
 919         },
 920         {1, 0, 2, 0,            /* 0x79 */
 921                 {{0, 0},
 922                 {3, 6},
 923                 {0, 0},
 924                 {0, 0}
 925                 }
 926         },
 927         {0, 0, 2, 0,            /* 0x7a */
 928                 {{1, 1},
 929                 {3, 6},
 930                 {0, 0},
 931                 {0, 0}
 932                 }
 933         },
 934         {1, 0, 2, 0,            /* 0x7b */
 935                 {{0, 1},
 936                 {3, 6},
 937                 {0, 0},
 938                 {0, 0}
 939                 }
 940         },
 941         {0, 0, 1, 0,            /* 0x7c */
 942                 {{2, 6},
 943                 {0, 0},
 944                 {0, 0},
 945                 {0, 0}
 946                 }
 947         },
 948         {1, 0, 2, 0,            /* 0x7d */
 949                 {{0, 0},
 950                 {2, 6},
 951                 {0, 0},
 952                 {0, 0}
 953                 }
 954         },
 955         {0, 0, 1, 0,            /* 0x7e */
 956                 {{1, 6},
 957                 {0, 0},
 958                 {0, 0},
 959                 {0, 0}
 960                 }
 961         },
 962         {1, 0, 1, 0,            /* 0x7f */
 963                 {{0, 6},
 964                 {0, 0},
 965                 {0, 0},
 966                 {0, 0}
 967                 }
 968         },
 969         {0, 1, 1, 0,            /* 0x80 */
 970                 {{7, 7},
 971                 {0, 0},
 972                 {0, 0},
 973                 {0, 0}
 974                 }
 975         },
 976         {1, 1, 2, 0,            /* 0x81 */
 977                 {{0, 0},
 978                 {7, 7},
 979                 {0, 0},
 980                 {0, 0}
 981                 }
 982         },
 983         {0, 1, 2, 0,            /* 0x82 */
 984                 {{1, 1},
 985                 {7, 7},
 986                 {0, 0},
 987                 {0, 0}
 988                 }
 989         },
 990         {1, 1, 2, 0,            /* 0x83 */
 991                 {{0, 1},
 992                 {7, 7},
 993                 {0, 0},
 994                 {0, 0}
 995                 }
 996         },
 997         {0, 1, 2, 0,            /* 0x84 */
 998                 {{2, 2},
 999                 {7, 7},
1000                 {0, 0},
1001                 {0, 0}
1002                 }
1003         },
1004         {1, 1, 3, 0,            /* 0x85 */
1005                 {{0, 0},
1006                 {2, 2},
1007                 {7, 7},
1008                 {0, 0}
1009                 }
1010         },
1011         {0, 1, 2, 0,            /* 0x86 */
1012                 {{1, 2},
1013                 {7, 7},
1014                 {0, 0},
1015                 {0, 0}
1016                 }
1017         },
1018         {1, 1, 2, 0,            /* 0x87 */
1019                 {{0, 2},
1020                 {7, 7},
1021                 {0, 0},
1022                 {0, 0}
1023                 }
1024         },
1025         {0, 1, 2, 0,            /* 0x88 */
1026                 {{3, 3},
1027                 {7, 7},
1028                 {0, 0},
1029                 {0, 0}
1030                 }
1031         },
1032         {1, 1, 3, 0,            /* 0x89 */
1033                 {{0, 0},
1034                 {3, 3},
1035                 {7, 7},
1036                 {0, 0}
1037                 }
1038         },
1039         {0, 1, 3, 0,            /* 0x8a */
1040                 {{1, 1},
1041                 {3, 3},
1042                 {7, 7},
1043                 {0, 0}
1044                 }
1045         },
1046         {1, 1, 3, 0,            /* 0x8b */
1047                 {{0, 1},
1048                 {3, 3},
1049                 {7, 7},
1050                 {0, 0}
1051                 }
1052         },
1053         {0, 1, 2, 0,            /* 0x8c */
1054                 {{2, 3},
1055                 {7, 7},
1056                 {0, 0},
1057                 {0, 0}
1058                 }
1059         },
1060         {1, 1, 3, 0,            /* 0x8d */
1061                 {{0, 0},
1062                 {2, 3},
1063                 {7, 7},
1064                 {0, 0}
1065                 }
1066         },
1067         {0, 1, 2, 0,            /* 0x8e */
1068                 {{1, 3},
1069                 {7, 7},
1070                 {0, 0},
1071                 {0, 0}
1072                 }
1073         },
1074         {1, 1, 2, 0,            /* 0x8f */
1075                 {{0, 3},
1076                 {7, 7},
1077                 {0, 0},
1078                 {0, 0}
1079                 }
1080         },
1081         {0, 1, 2, 0,            /* 0x90 */
1082                 {{4, 4},
1083                 {7, 7},
1084                 {0, 0},
1085                 {0, 0}
1086                 }
1087         },
1088         {1, 1, 3, 0,            /* 0x91 */
1089                 {{0, 0},
1090                 {4, 4},
1091                 {7, 7},
1092                 {0, 0}
1093                 }
1094         },
1095         {0, 1, 3, 0,            /* 0x92 */
1096                 {{1, 1},
1097                 {4, 4},
1098                 {7, 7},
1099                 {0, 0}
1100                 }
1101         },
1102         {1, 1, 3, 0,            /* 0x93 */
1103                 {{0, 1},
1104                 {4, 4},
1105                 {7, 7},
1106                 {0, 0}
1107                 }
1108         },
1109         {0, 1, 3, 0,            /* 0x94 */
1110                 {{2, 2},
1111                 {4, 4},
1112                 {7, 7},
1113                 {0, 0}
1114                 }
1115         },
1116         {1, 1, 4, 0,            /* 0x95 */
1117                 {{0, 0},
1118                 {2, 2},
1119                 {4, 4},
1120                 {7, 7}
1121                 }
1122         },
1123         {0, 1, 3, 0,            /* 0x96 */
1124                 {{1, 2},
1125                 {4, 4},
1126                 {7, 7},
1127                 {0, 0}
1128                 }
1129         },
1130         {1, 1, 3, 0,            /* 0x97 */
1131                 {{0, 2},
1132                 {4, 4},
1133                 {7, 7},
1134                 {0, 0}
1135                 }
1136         },
1137         {0, 1, 2, 0,            /* 0x98 */
1138                 {{3, 4},
1139                 {7, 7},
1140                 {0, 0},
1141                 {0, 0}
1142                 }
1143         },
1144         {1, 1, 3, 0,            /* 0x99 */
1145                 {{0, 0},
1146                 {3, 4},
1147                 {7, 7},
1148                 {0, 0}
1149                 }
1150         },
1151         {0, 1, 3, 0,            /* 0x9a */
1152                 {{1, 1},
1153                 {3, 4},
1154                 {7, 7},
1155                 {0, 0}
1156                 }
1157         },
1158         {1, 1, 3, 0,            /* 0x9b */
1159                 {{0, 1},
1160                 {3, 4},
1161                 {7, 7},
1162                 {0, 0}
1163                 }
1164         },
1165         {0, 1, 2, 0,            /* 0x9c */
1166                 {{2, 4},
1167                 {7, 7},
1168                 {0, 0},
1169                 {0, 0}
1170                 }
1171         },
1172         {1, 1, 3, 0,            /* 0x9d */
1173                 {{0, 0},
1174                 {2, 4},
1175                 {7, 7},
1176                 {0, 0}
1177                 }
1178         },
1179         {0, 1, 2, 0,            /* 0x9e */
1180                 {{1, 4},
1181                 {7, 7},
1182                 {0, 0},
1183                 {0, 0}
1184                 }
1185         },
1186         {1, 1, 2, 0,            /* 0x9f */
1187                 {{0, 4},
1188                 {7, 7},
1189                 {0, 0},
1190                 {0, 0}
1191                 }
1192         },
1193         {0, 1, 2, 0,            /* 0xa0 */
1194                 {{5, 5},
1195                 {7, 7},
1196                 {0, 0},
1197                 {0, 0}
1198                 }
1199         },
1200         {1, 1, 3, 0,            /* 0xa1 */
1201                 {{0, 0},
1202                 {5, 5},
1203                 {7, 7},
1204                 {0, 0}
1205                 }
1206         },
1207         {0, 1, 3, 0,            /* 0xa2 */
1208                 {{1, 1},
1209                 {5, 5},
1210                 {7, 7},
1211                 {0, 0}
1212                 }
1213         },
1214         {1, 1, 3, 0,            /* 0xa3 */
1215                 {{0, 1},
1216                 {5, 5},
1217                 {7, 7},
1218                 {0, 0}
1219                 }
1220         },
1221         {0, 1, 3, 0,            /* 0xa4 */
1222                 {{2, 2},
1223                 {5, 5},
1224                 {7, 7},
1225                 {0, 0}
1226                 }
1227         },
1228         {1, 1, 4, 0,            /* 0xa5 */
1229                 {{0, 0},
1230                 {2, 2},
1231                 {5, 5},
1232                 {7, 7}
1233                 }
1234         },
1235         {0, 1, 3, 0,            /* 0xa6 */
1236                 {{1, 2},
1237                 {5, 5},
1238                 {7, 7},
1239                 {0, 0}
1240                 }
1241         },
1242         {1, 1, 3, 0,            /* 0xa7 */
1243                 {{0, 2},
1244                 {5, 5},
1245                 {7, 7},
1246                 {0, 0}
1247                 }
1248         },
1249         {0, 1, 3, 0,            /* 0xa8 */
1250                 {{3, 3},
1251                 {5, 5},
1252                 {7, 7},
1253                 {0, 0}
1254                 }
1255         },
1256         {1, 1, 4, 0,            /* 0xa9 */
1257                 {{0, 0},
1258                 {3, 3},
1259                 {5, 5},
1260                 {7, 7}
1261                 }
1262         },
1263         {0, 1, 4, 0,            /* 0xaa */
1264                 {{1, 1},
1265                 {3, 3},
1266                 {5, 5},
1267                 {7, 7}
1268                 }
1269         },
1270         {1, 1, 4, 0,            /* 0xab */
1271                 {{0, 1},
1272                 {3, 3},
1273                 {5, 5},
1274                 {7, 7}
1275                 }
1276         },
1277         {0, 1, 3, 0,            /* 0xac */
1278                 {{2, 3},
1279                 {5, 5},
1280                 {7, 7},
1281                 {0, 0}
1282                 }
1283         },
1284         {1, 1, 4, 0,            /* 0xad */
1285                 {{0, 0},
1286                 {2, 3},
1287                 {5, 5},
1288                 {7, 7}
1289                 }
1290         },
1291         {0, 1, 3, 0,            /* 0xae */
1292                 {{1, 3},
1293                 {5, 5},
1294                 {7, 7},
1295                 {0, 0}
1296                 }
1297         },
1298         {1, 1, 3, 0,            /* 0xaf */
1299                 {{0, 3},
1300                 {5, 5},
1301                 {7, 7},
1302                 {0, 0}
1303                 }
1304         },
1305         {0, 1, 2, 0,            /* 0xb0 */
1306                 {{4, 5},
1307                 {7, 7},
1308                 {0, 0},
1309                 {0, 0}
1310                 }
1311         },
1312         {1, 1, 3, 0,            /* 0xb1 */
1313                 {{0, 0},
1314                 {4, 5},
1315                 {7, 7},
1316                 {0, 0}
1317                 }
1318         },
1319         {0, 1, 3, 0,            /* 0xb2 */
1320                 {{1, 1},
1321                 {4, 5},
1322                 {7, 7},
1323                 {0, 0}
1324                 }
1325         },
1326         {1, 1, 3, 0,            /* 0xb3 */
1327                 {{0, 1},
1328                 {4, 5},
1329                 {7, 7},
1330                 {0, 0}
1331                 }
1332         },
1333         {0, 1, 3, 0,            /* 0xb4 */
1334                 {{2, 2},
1335                 {4, 5},
1336                 {7, 7},
1337                 {0, 0}
1338                 }
1339         },
1340         {1, 1, 4, 0,            /* 0xb5 */
1341                 {{0, 0},
1342                 {2, 2},
1343                 {4, 5},
1344                 {7, 7}
1345                 }
1346         },
1347         {0, 1, 3, 0,            /* 0xb6 */
1348                 {{1, 2},
1349                 {4, 5},
1350                 {7, 7},
1351                 {0, 0}
1352                 }
1353         },
1354         {1, 1, 3, 0,            /* 0xb7 */
1355                 {{0, 2},
1356                 {4, 5},
1357                 {7, 7},
1358                 {0, 0}
1359                 }
1360         },
1361         {0, 1, 2, 0,            /* 0xb8 */
1362                 {{3, 5},
1363                 {7, 7},
1364                 {0, 0},
1365                 {0, 0}
1366                 }
1367         },
1368         {1, 1, 3, 0,            /* 0xb9 */
1369                 {{0, 0},
1370                 {3, 5},
1371                 {7, 7},
1372                 {0, 0}
1373                 }
1374         },
1375         {0, 1, 3, 0,            /* 0xba */
1376                 {{1, 1},
1377                 {3, 5},
1378                 {7, 7},
1379                 {0, 0}
1380                 }
1381         },
1382         {1, 1, 3, 0,            /* 0xbb */
1383                 {{0, 1},
1384                 {3, 5},
1385                 {7, 7},
1386                 {0, 0}
1387                 }
1388         },
1389         {0, 1, 2, 0,            /* 0xbc */
1390                 {{2, 5},
1391                 {7, 7},
1392                 {0, 0},
1393                 {0, 0}
1394                 }
1395         },
1396         {1, 1, 3, 0,            /* 0xbd */
1397                 {{0, 0},
1398                 {2, 5},
1399                 {7, 7},
1400                 {0, 0}
1401                 }
1402         },
1403         {0, 1, 2, 0,            /* 0xbe */
1404                 {{1, 5},
1405                 {7, 7},
1406                 {0, 0},
1407                 {0, 0}
1408                 }
1409         },
1410         {1, 1, 2, 0,            /* 0xbf */
1411                 {{0, 5},
1412                 {7, 7},
1413                 {0, 0},
1414                 {0, 0}
1415                 }
1416         },
1417         {0, 1, 1, 0,            /* 0xc0 */
1418                 {{6, 7},
1419                 {0, 0},
1420                 {0, 0},
1421                 {0, 0}
1422                 }
1423         },
1424         {1, 1, 2, 0,            /* 0xc1 */
1425                 {{0, 0},
1426                 {6, 7},
1427                 {0, 0},
1428                 {0, 0}
1429                 }
1430         },
1431         {0, 1, 2, 0,            /* 0xc2 */
1432                 {{1, 1},
1433                 {6, 7},
1434                 {0, 0},
1435                 {0, 0}
1436                 }
1437         },
1438         {1, 1, 2, 0,            /* 0xc3 */
1439                 {{0, 1},
1440                 {6, 7},
1441                 {0, 0},
1442                 {0, 0}
1443                 }
1444         },
1445         {0, 1, 2, 0,            /* 0xc4 */
1446                 {{2, 2},
1447                 {6, 7},
1448                 {0, 0},
1449                 {0, 0}
1450                 }
1451         },
1452         {1, 1, 3, 0,            /* 0xc5 */
1453                 {{0, 0},
1454                 {2, 2},
1455                 {6, 7},
1456                 {0, 0}
1457                 }
1458         },
1459         {0, 1, 2, 0,            /* 0xc6 */
1460                 {{1, 2},
1461                 {6, 7},
1462                 {0, 0},
1463                 {0, 0}
1464                 }
1465         },
1466         {1, 1, 2, 0,            /* 0xc7 */
1467                 {{0, 2},
1468                 {6, 7},
1469                 {0, 0},
1470                 {0, 0}
1471                 }
1472         },
1473         {0, 1, 2, 0,            /* 0xc8 */
1474                 {{3, 3},
1475                 {6, 7},
1476                 {0, 0},
1477                 {0, 0}
1478                 }
1479         },
1480         {1, 1, 3, 0,            /* 0xc9 */
1481                 {{0, 0},
1482                 {3, 3},
1483                 {6, 7},
1484                 {0, 0}
1485                 }
1486         },
1487         {0, 1, 3, 0,            /* 0xca */
1488                 {{1, 1},
1489                 {3, 3},
1490                 {6, 7},
1491                 {0, 0}
1492                 }
1493         },
1494         {1, 1, 3, 0,            /* 0xcb */
1495                 {{0, 1},
1496                 {3, 3},
1497                 {6, 7},
1498                 {0, 0}
1499                 }
1500         },
1501         {0, 1, 2, 0,            /* 0xcc */
1502                 {{2, 3},
1503                 {6, 7},
1504                 {0, 0},
1505                 {0, 0}
1506                 }
1507         },
1508         {1, 1, 3, 0,            /* 0xcd */
1509                 {{0, 0},
1510                 {2, 3},
1511                 {6, 7},
1512                 {0, 0}
1513                 }
1514         },
1515         {0, 1, 2, 0,            /* 0xce */
1516                 {{1, 3},
1517                 {6, 7},
1518                 {0, 0},
1519                 {0, 0}
1520                 }
1521         },
1522         {1, 1, 2, 0,            /* 0xcf */
1523                 {{0, 3},
1524                 {6, 7},
1525                 {0, 0},
1526                 {0, 0}
1527                 }
1528         },
1529         {0, 1, 2, 0,            /* 0xd0 */
1530                 {{4, 4},
1531                 {6, 7},
1532                 {0, 0},
1533                 {0, 0}
1534                 }
1535         },
1536         {1, 1, 3, 0,            /* 0xd1 */
1537                 {{0, 0},
1538                 {4, 4},
1539                 {6, 7},
1540                 {0, 0}
1541                 }
1542         },
1543         {0, 1, 3, 0,            /* 0xd2 */
1544                 {{1, 1},
1545                 {4, 4},
1546                 {6, 7},
1547                 {0, 0}
1548                 }
1549         },
1550         {1, 1, 3, 0,            /* 0xd3 */
1551                 {{0, 1},
1552                 {4, 4},
1553                 {6, 7},
1554                 {0, 0}
1555                 }
1556         },
1557         {0, 1, 3, 0,            /* 0xd4 */
1558                 {{2, 2},
1559                 {4, 4},
1560                 {6, 7},
1561                 {0, 0}
1562                 }
1563         },
1564         {1, 1, 4, 0,            /* 0xd5 */
1565                 {{0, 0},
1566                 {2, 2},
1567                 {4, 4},
1568                 {6, 7}
1569                 }
1570         },
1571         {0, 1, 3, 0,            /* 0xd6 */
1572                 {{1, 2},
1573                 {4, 4},
1574                 {6, 7},
1575                 {0, 0}
1576                 }
1577         },
1578         {1, 1, 3, 0,            /* 0xd7 */
1579                 {{0, 2},
1580                 {4, 4},
1581                 {6, 7},
1582                 {0, 0}
1583                 }
1584         },
1585         {0, 1, 2, 0,            /* 0xd8 */
1586                 {{3, 4},
1587                 {6, 7},
1588                 {0, 0},
1589                 {0, 0}
1590                 }
1591         },
1592         {1, 1, 3, 0,            /* 0xd9 */
1593                 {{0, 0},
1594                 {3, 4},
1595                 {6, 7},
1596                 {0, 0}
1597                 }
1598         },
1599         {0, 1, 3, 0,            /* 0xda */
1600                 {{1, 1},
1601                 {3, 4},
1602                 {6, 7},
1603                 {0, 0}
1604                 }
1605         },
1606         {1, 1, 3, 0,            /* 0xdb */
1607                 {{0, 1},
1608                 {3, 4},
1609                 {6, 7},
1610                 {0, 0}
1611                 }
1612         },
1613         {0, 1, 2, 0,            /* 0xdc */
1614                 {{2, 4},
1615                 {6, 7},
1616                 {0, 0},
1617                 {0, 0}
1618                 }
1619         },
1620         {1, 1, 3, 0,            /* 0xdd */
1621                 {{0, 0},
1622                 {2, 4},
1623                 {6, 7},
1624                 {0, 0}
1625                 }
1626         },
1627         {0, 1, 2, 0,            /* 0xde */
1628                 {{1, 4},
1629                 {6, 7},
1630                 {0, 0},
1631                 {0, 0}
1632                 }
1633         },
1634         {1, 1, 2, 0,            /* 0xdf */
1635                 {{0, 4},
1636                 {6, 7},
1637                 {0, 0},
1638                 {0, 0}
1639                 }
1640         },
1641         {0, 1, 1, 0,            /* 0xe0 */
1642                 {{5, 7},
1643                 {0, 0},
1644                 {0, 0},
1645                 {0, 0}
1646                 }
1647         },
1648         {1, 1, 2, 0,            /* 0xe1 */
1649                 {{0, 0},
1650                 {5, 7},
1651                 {0, 0},
1652                 {0, 0}
1653                 }
1654         },
1655         {0, 1, 2, 0,            /* 0xe2 */
1656                 {{1, 1},
1657                 {5, 7},
1658                 {0, 0},
1659                 {0, 0}
1660                 }
1661         },
1662         {1, 1, 2, 0,            /* 0xe3 */
1663                 {{0, 1},
1664                 {5, 7},
1665                 {0, 0},
1666                 {0, 0}
1667                 }
1668         },
1669         {0, 1, 2, 0,            /* 0xe4 */
1670                 {{2, 2},
1671                 {5, 7},
1672                 {0, 0},
1673                 {0, 0}
1674                 }
1675         },
1676         {1, 1, 3, 0,            /* 0xe5 */
1677                 {{0, 0},
1678                 {2, 2},
1679                 {5, 7},
1680                 {0, 0}
1681                 }
1682         },
1683         {0, 1, 2, 0,            /* 0xe6 */
1684                 {{1, 2},
1685                 {5, 7},
1686                 {0, 0},
1687                 {0, 0}
1688                 }
1689         },
1690         {1, 1, 2, 0,            /* 0xe7 */
1691                 {{0, 2},
1692                 {5, 7},
1693                 {0, 0},
1694                 {0, 0}
1695                 }
1696         },
1697         {0, 1, 2, 0,            /* 0xe8 */
1698                 {{3, 3},
1699                 {5, 7},
1700                 {0, 0},
1701                 {0, 0}
1702                 }
1703         },
1704         {1, 1, 3, 0,            /* 0xe9 */
1705                 {{0, 0},
1706                 {3, 3},
1707                 {5, 7},
1708                 {0, 0}
1709                 }
1710         },
1711         {0, 1, 3, 0,            /* 0xea */
1712                 {{1, 1},
1713                 {3, 3},
1714                 {5, 7},
1715                 {0, 0}
1716                 }
1717         },
1718         {1, 1, 3, 0,            /* 0xeb */
1719                 {{0, 1},
1720                 {3, 3},
1721                 {5, 7},
1722                 {0, 0}
1723                 }
1724         },
1725         {0, 1, 2, 0,            /* 0xec */
1726                 {{2, 3},
1727                 {5, 7},
1728                 {0, 0},
1729                 {0, 0}
1730                 }
1731         },
1732         {1, 1, 3, 0,            /* 0xed */
1733                 {{0, 0},
1734                 {2, 3},
1735                 {5, 7},
1736                 {0, 0}
1737                 }
1738         },
1739         {0, 1, 2, 0,            /* 0xee */
1740                 {{1, 3},
1741                 {5, 7},
1742                 {0, 0},
1743                 {0, 0}
1744                 }
1745         },
1746         {1, 1, 2, 0,            /* 0xef */
1747                 {{0, 3},
1748                 {5, 7},
1749                 {0, 0},
1750                 {0, 0}
1751                 }
1752         },
1753         {0, 1, 1, 0,            /* 0xf0 */
1754                 {{4, 7},
1755                 {0, 0},
1756                 {0, 0},
1757                 {0, 0}
1758                 }
1759         },
1760         {1, 1, 2, 0,            /* 0xf1 */
1761                 {{0, 0},
1762                 {4, 7},
1763                 {0, 0},
1764                 {0, 0}
1765                 }
1766         },
1767         {0, 1, 2, 0,            /* 0xf2 */
1768                 {{1, 1},
1769                 {4, 7},
1770                 {0, 0},
1771                 {0, 0}
1772                 }
1773         },
1774         {1, 1, 2, 0,            /* 0xf3 */
1775                 {{0, 1},
1776                 {4, 7},
1777                 {0, 0},
1778                 {0, 0}
1779                 }
1780         },
1781         {0, 1, 2, 0,            /* 0xf4 */
1782                 {{2, 2},
1783                 {4, 7},
1784                 {0, 0},
1785                 {0, 0}
1786                 }
1787         },
1788         {1, 1, 3, 0,            /* 0xf5 */
1789                 {{0, 0},
1790                 {2, 2},
1791                 {4, 7},
1792                 {0, 0}
1793                 }
1794         },
1795         {0, 1, 2, 0,            /* 0xf6 */
1796                 {{1, 2},
1797                 {4, 7},
1798                 {0, 0},
1799                 {0, 0}
1800                 }
1801         },
1802         {1, 1, 2, 0,            /* 0xf7 */
1803                 {{0, 2},
1804                 {4, 7},
1805                 {0, 0},
1806                 {0, 0}
1807                 }
1808         },
1809         {0, 1, 1, 0,            /* 0xf8 */
1810                 {{3, 7},
1811                 {0, 0},
1812                 {0, 0},
1813                 {0, 0}
1814                 }
1815         },
1816         {1, 1, 2, 0,            /* 0xf9 */
1817                 {{0, 0},
1818                 {3, 7},
1819                 {0, 0},
1820                 {0, 0}
1821                 }
1822         },
1823         {0, 1, 2, 0,            /* 0xfa */
1824                 {{1, 1},
1825                 {3, 7},
1826                 {0, 0},
1827                 {0, 0}
1828                 }
1829         },
1830         {1, 1, 2, 0,            /* 0xfb */
1831                 {{0, 1},
1832                 {3, 7},
1833                 {0, 0},
1834                 {0, 0}
1835                 }
1836         },
1837         {0, 1, 1, 0,            /* 0xfc */
1838                 {{2, 7},
1839                 {0, 0},
1840                 {0, 0},
1841                 {0, 0}
1842                 }
1843         },
1844         {1, 1, 2, 0,            /* 0xfd */
1845                 {{0, 0},
1846                 {2, 7},
1847                 {0, 0},
1848                 {0, 0}
1849                 }
1850         },
1851         {0, 1, 1, 0,            /* 0xfe */
1852                 {{1, 7},
1853                 {0, 0},
1854                 {0, 0},
1855                 {0, 0}
1856                 }
1857         },
1858         {1, 1, 1, 0,            /* 0xff */
1859                 {{0, 7},
1860                 {0, 0},
1861                 {0, 0},
1862                 {0, 0}
1863                 }
1864         }
1865 };
1866
1867
1868 int
1869 sctp_is_address_in_scope(struct sctp_ifa *ifa,
1870     struct sctp_scoping *scope,
1871     int do_update)
1872 {
1873         if ((scope->loopback_scope == 0) &&
1874             (ifa->ifn_p) && SCTP_IFN_IS_IFT_LOOP(ifa->ifn_p)) {
1875                 /*
1876                  * skip loopback if not in scope *
1877                  */
1878                 return (0);
1879         }
1880         switch (ifa->address.sa.sa_family) {
1881 #ifdef INET
1882         case AF_INET:
1883                 if (scope->ipv4_addr_legal) {
1884                         struct sockaddr_in *sin;
1885
1886                         sin = &ifa->address.sin;
1887                         if (sin->sin_addr.s_addr == 0) {
1888                                 /* not in scope , unspecified */
1889                                 return (0);
1890                         }
1891                         if ((scope->ipv4_local_scope == 0) &&
1892                             (IN4_ISPRIVATE_ADDRESS(&sin->sin_addr))) {
1893                                 /* private address not in scope */
1894                                 return (0);
1895                         }
1896                 } else {
1897                         return (0);
1898                 }
1899                 break;
1900 #endif
1901 #ifdef INET6
1902         case AF_INET6:
1903                 if (scope->ipv6_addr_legal) {
1904                         struct sockaddr_in6 *sin6;
1905
1906                         /*
1907                          * Must update the flags,  bummer, which means any
1908                          * IFA locks must now be applied HERE <->
1909                          */
1910                         if (do_update) {
1911                                 sctp_gather_internal_ifa_flags(ifa);
1912                         }
1913                         if (ifa->localifa_flags & SCTP_ADDR_IFA_UNUSEABLE) {
1914                                 return (0);
1915                         }
1916                         /* ok to use deprecated addresses? */
1917                         sin6 = &ifa->address.sin6;
1918                         if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) {
1919                                 /* skip unspecifed addresses */
1920                                 return (0);
1921                         }
1922                         if (    /* (local_scope == 0) && */
1923                             (IN6_IS_ADDR_LINKLOCAL(&sin6->sin6_addr))) {
1924                                 return (0);
1925                         }
1926                         if ((scope->site_scope == 0) &&
1927                             (IN6_IS_ADDR_SITELOCAL(&sin6->sin6_addr))) {
1928                                 return (0);
1929                         }
1930                 } else {
1931                         return (0);
1932                 }
1933                 break;
1934 #endif
1935         default:
1936                 return (0);
1937         }
1938         return (1);
1939 }
1940
1941 static struct mbuf *
1942 sctp_add_addr_to_mbuf(struct mbuf *m, struct sctp_ifa *ifa, uint16_t *len)
1943 {
1944 #if defined(INET) || defined(INET6)
1945         struct sctp_paramhdr *paramh;
1946         struct mbuf *mret;
1947         uint16_t plen;
1948 #endif
1949
1950         switch (ifa->address.sa.sa_family) {
1951 #ifdef INET
1952         case AF_INET:
1953                 plen = (uint16_t)sizeof(struct sctp_ipv4addr_param);
1954                 break;
1955 #endif
1956 #ifdef INET6
1957         case AF_INET6:
1958                 plen = (uint16_t)sizeof(struct sctp_ipv6addr_param);
1959                 break;
1960 #endif
1961         default:
1962                 return (m);
1963         }
1964 #if defined(INET) || defined(INET6)
1965         if (M_TRAILINGSPACE(m) >= plen) {
1966                 /* easy side we just drop it on the end */
1967                 paramh = (struct sctp_paramhdr *)(SCTP_BUF_AT(m, SCTP_BUF_LEN(m)));
1968                 mret = m;
1969         } else {
1970                 /* Need more space */
1971                 mret = m;
1972                 while (SCTP_BUF_NEXT(mret) != NULL) {
1973                         mret = SCTP_BUF_NEXT(mret);
1974                 }
1975                 SCTP_BUF_NEXT(mret) = sctp_get_mbuf_for_msg(plen, 0, M_NOWAIT, 1, MT_DATA);
1976                 if (SCTP_BUF_NEXT(mret) == NULL) {
1977                         /* We are hosed, can't add more addresses */
1978                         return (m);
1979                 }
1980                 mret = SCTP_BUF_NEXT(mret);
1981                 paramh = mtod(mret, struct sctp_paramhdr *);
1982         }
1983         /* now add the parameter */
1984         switch (ifa->address.sa.sa_family) {
1985 #ifdef INET
1986         case AF_INET:
1987                 {
1988                         struct sctp_ipv4addr_param *ipv4p;
1989                         struct sockaddr_in *sin;
1990
1991                         sin = &ifa->address.sin;
1992                         ipv4p = (struct sctp_ipv4addr_param *)paramh;
1993                         paramh->param_type = htons(SCTP_IPV4_ADDRESS);
1994                         paramh->param_length = htons(plen);
1995                         ipv4p->addr = sin->sin_addr.s_addr;
1996                         SCTP_BUF_LEN(mret) += plen;
1997                         break;
1998                 }
1999 #endif
2000 #ifdef INET6
2001         case AF_INET6:
2002                 {
2003                         struct sctp_ipv6addr_param *ipv6p;
2004                         struct sockaddr_in6 *sin6;
2005
2006                         sin6 = &ifa->address.sin6;
2007                         ipv6p = (struct sctp_ipv6addr_param *)paramh;
2008                         paramh->param_type = htons(SCTP_IPV6_ADDRESS);
2009                         paramh->param_length = htons(plen);
2010                         memcpy(ipv6p->addr, &sin6->sin6_addr,
2011                             sizeof(ipv6p->addr));
2012                         /* clear embedded scope in the address */
2013                         in6_clearscope((struct in6_addr *)ipv6p->addr);
2014                         SCTP_BUF_LEN(mret) += plen;
2015                         break;
2016                 }
2017 #endif
2018         default:
2019                 return (m);
2020         }
2021         if (len != NULL) {
2022                 *len += plen;
2023         }
2024         return (mret);
2025 #endif
2026 }
2027
2028
2029 struct mbuf *
2030 sctp_add_addresses_to_i_ia(struct sctp_inpcb *inp, struct sctp_tcb *stcb,
2031     struct sctp_scoping *scope,
2032     struct mbuf *m_at, int cnt_inits_to,
2033     uint16_t *padding_len, uint16_t *chunk_len)
2034 {
2035         struct sctp_vrf *vrf = NULL;
2036         int cnt, limit_out = 0, total_count;
2037         uint32_t vrf_id;
2038
2039         vrf_id = inp->def_vrf_id;
2040         SCTP_IPI_ADDR_RLOCK();
2041         vrf = sctp_find_vrf(vrf_id);
2042         if (vrf == NULL) {
2043                 SCTP_IPI_ADDR_RUNLOCK();
2044                 return (m_at);
2045         }
2046         if (inp->sctp_flags & SCTP_PCB_FLAGS_BOUNDALL) {
2047                 struct sctp_ifa *sctp_ifap;
2048                 struct sctp_ifn *sctp_ifnp;
2049
2050                 cnt = cnt_inits_to;
2051                 if (vrf->total_ifa_count > SCTP_COUNT_LIMIT) {
2052                         limit_out = 1;
2053                         cnt = SCTP_ADDRESS_LIMIT;
2054                         goto skip_count;
2055                 }
2056                 LIST_FOREACH(sctp_ifnp, &vrf->ifnlist, next_ifn) {
2057                         if ((scope->loopback_scope == 0) &&
2058                             SCTP_IFN_IS_IFT_LOOP(sctp_ifnp)) {
2059                                 /*
2060                                  * Skip loopback devices if loopback_scope
2061                                  * not set
2062                                  */
2063                                 continue;
2064                         }
2065                         LIST_FOREACH(sctp_ifap, &sctp_ifnp->ifalist, next_ifa) {
2066 #ifdef INET
2067                                 if ((sctp_ifap->address.sa.sa_family == AF_INET) &&
2068                                     (prison_check_ip4(inp->ip_inp.inp.inp_cred,
2069                                     &sctp_ifap->address.sin.sin_addr) != 0)) {
2070                                         continue;
2071                                 }
2072 #endif
2073 #ifdef INET6
2074                                 if ((sctp_ifap->address.sa.sa_family == AF_INET6) &&
2075                                     (prison_check_ip6(inp->ip_inp.inp.inp_cred,
2076                                     &sctp_ifap->address.sin6.sin6_addr) != 0)) {
2077                                         continue;
2078                                 }
2079 #endif
2080                                 if (sctp_is_addr_restricted(stcb, sctp_ifap)) {
2081                                         continue;
2082                                 }
2083                                 if (sctp_is_address_in_scope(sctp_ifap, scope, 1) == 0) {
2084                                         continue;
2085                                 }
2086                                 cnt++;
2087                                 if (cnt > SCTP_ADDRESS_LIMIT) {
2088                                         break;
2089                                 }
2090                         }
2091                         if (cnt > SCTP_ADDRESS_LIMIT) {
2092                                 break;
2093                         }
2094                 }
2095 skip_count:
2096                 if (cnt > 1) {
2097                         total_count = 0;
2098                         LIST_FOREACH(sctp_ifnp, &vrf->ifnlist, next_ifn) {
2099                                 cnt = 0;
2100                                 if ((scope->loopback_scope == 0) &&
2101                                     SCTP_IFN_IS_IFT_LOOP(sctp_ifnp)) {
2102                                         /*
2103                                          * Skip loopback devices if
2104                                          * loopback_scope not set
2105                                          */
2106                                         continue;
2107                                 }
2108                                 LIST_FOREACH(sctp_ifap, &sctp_ifnp->ifalist, next_ifa) {
2109 #ifdef INET
2110                                         if ((sctp_ifap->address.sa.sa_family == AF_INET) &&
2111                                             (prison_check_ip4(inp->ip_inp.inp.inp_cred,
2112                                             &sctp_ifap->address.sin.sin_addr) != 0)) {
2113                                                 continue;
2114                                         }
2115 #endif
2116 #ifdef INET6
2117                                         if ((sctp_ifap->address.sa.sa_family == AF_INET6) &&
2118                                             (prison_check_ip6(inp->ip_inp.inp.inp_cred,
2119                                             &sctp_ifap->address.sin6.sin6_addr) != 0)) {
2120                                                 continue;
2121                                         }
2122 #endif
2123                                         if (sctp_is_addr_restricted(stcb, sctp_ifap)) {
2124                                                 continue;
2125                                         }
2126                                         if (sctp_is_address_in_scope(sctp_ifap,
2127                                             scope, 0) == 0) {
2128                                                 continue;
2129                                         }
2130                                         if ((chunk_len != NULL) &&
2131                                             (padding_len != NULL) &&
2132                                             (*padding_len > 0)) {
2133                                                 memset(mtod(m_at, caddr_t)+*chunk_len, 0, *padding_len);
2134                                                 SCTP_BUF_LEN(m_at) += *padding_len;
2135                                                 *chunk_len += *padding_len;
2136                                                 *padding_len = 0;
2137                                         }
2138                                         m_at = sctp_add_addr_to_mbuf(m_at, sctp_ifap, chunk_len);
2139                                         if (limit_out) {
2140                                                 cnt++;
2141                                                 total_count++;
2142                                                 if (cnt >= 2) {
2143                                                         /*
2144                                                          * two from each
2145                                                          * address
2146                                                          */
2147                                                         break;
2148                                                 }
2149                                                 if (total_count > SCTP_ADDRESS_LIMIT) {
2150                                                         /* No more addresses */
2151                                                         break;
2152                                                 }
2153                                         }
2154                                 }
2155                         }
2156                 }
2157         } else {
2158                 struct sctp_laddr *laddr;
2159
2160                 cnt = cnt_inits_to;
2161                 /* First, how many ? */
2162                 LIST_FOREACH(laddr, &inp->sctp_addr_list, sctp_nxt_addr) {
2163                         if (laddr->ifa == NULL) {
2164                                 continue;
2165                         }
2166                         if (laddr->ifa->localifa_flags & SCTP_BEING_DELETED)
2167                                 /*
2168                                  * Address being deleted by the system, dont
2169                                  * list.
2170                                  */
2171                                 continue;
2172                         if (laddr->action == SCTP_DEL_IP_ADDRESS) {
2173                                 /*
2174                                  * Address being deleted on this ep don't
2175                                  * list.
2176                                  */
2177                                 continue;
2178                         }
2179                         if (sctp_is_address_in_scope(laddr->ifa,
2180                             scope, 1) == 0) {
2181                                 continue;
2182                         }
2183                         cnt++;
2184                 }
2185                 /*
2186                  * To get through a NAT we only list addresses if we have
2187                  * more than one. That way if you just bind a single address
2188                  * we let the source of the init dictate our address.
2189                  */
2190                 if (cnt > 1) {
2191                         cnt = cnt_inits_to;
2192                         LIST_FOREACH(laddr, &inp->sctp_addr_list, sctp_nxt_addr) {
2193                                 if (laddr->ifa == NULL) {
2194                                         continue;
2195                                 }
2196                                 if (laddr->ifa->localifa_flags & SCTP_BEING_DELETED) {
2197                                         continue;
2198                                 }
2199                                 if (sctp_is_address_in_scope(laddr->ifa,
2200                                     scope, 0) == 0) {
2201                                         continue;
2202                                 }
2203                                 if ((chunk_len != NULL) &&
2204                                     (padding_len != NULL) &&
2205                                     (*padding_len > 0)) {
2206                                         memset(mtod(m_at, caddr_t)+*chunk_len, 0, *padding_len);
2207                                         SCTP_BUF_LEN(m_at) += *padding_len;
2208                                         *chunk_len += *padding_len;
2209                                         *padding_len = 0;
2210                                 }
2211                                 m_at = sctp_add_addr_to_mbuf(m_at, laddr->ifa, chunk_len);
2212                                 cnt++;
2213                                 if (cnt >= SCTP_ADDRESS_LIMIT) {
2214                                         break;
2215                                 }
2216                         }
2217                 }
2218         }
2219         SCTP_IPI_ADDR_RUNLOCK();
2220         return (m_at);
2221 }
2222
2223 static struct sctp_ifa *
2224 sctp_is_ifa_addr_preferred(struct sctp_ifa *ifa,
2225     uint8_t dest_is_loop,
2226     uint8_t dest_is_priv,
2227     sa_family_t fam)
2228 {
2229         uint8_t dest_is_global = 0;
2230
2231         /* dest_is_priv is true if destination is a private address */
2232         /* dest_is_loop is true if destination is a loopback addresses */
2233
2234         /**
2235          * Here we determine if its a preferred address. A preferred address
2236          * means it is the same scope or higher scope then the destination.
2237          * L = loopback, P = private, G = global
2238          * -----------------------------------------
2239          *    src    |  dest | result
2240          *  ----------------------------------------
2241          *     L     |    L  |    yes
2242          *  -----------------------------------------
2243          *     P     |    L  |    yes-v4 no-v6
2244          *  -----------------------------------------
2245          *     G     |    L  |    yes-v4 no-v6
2246          *  -----------------------------------------
2247          *     L     |    P  |    no
2248          *  -----------------------------------------
2249          *     P     |    P  |    yes
2250          *  -----------------------------------------
2251          *     G     |    P  |    no
2252          *   -----------------------------------------
2253          *     L     |    G  |    no
2254          *   -----------------------------------------
2255          *     P     |    G  |    no
2256          *    -----------------------------------------
2257          *     G     |    G  |    yes
2258          *    -----------------------------------------
2259          */
2260
2261         if (ifa->address.sa.sa_family != fam) {
2262                 /* forget mis-matched family */
2263                 return (NULL);
2264         }
2265         if ((dest_is_priv == 0) && (dest_is_loop == 0)) {
2266                 dest_is_global = 1;
2267         }
2268         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Is destination preferred:");
2269         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, &ifa->address.sa);
2270         /* Ok the address may be ok */
2271 #ifdef INET6
2272         if (fam == AF_INET6) {
2273                 /* ok to use deprecated addresses? no lets not! */
2274                 if (ifa->localifa_flags & SCTP_ADDR_IFA_UNUSEABLE) {
2275                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:1\n");
2276                         return (NULL);
2277                 }
2278                 if (ifa->src_is_priv && !ifa->src_is_loop) {
2279                         if (dest_is_loop) {
2280                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:2\n");
2281                                 return (NULL);
2282                         }
2283                 }
2284                 if (ifa->src_is_glob) {
2285                         if (dest_is_loop) {
2286                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:3\n");
2287                                 return (NULL);
2288                         }
2289                 }
2290         }
2291 #endif
2292         /*
2293          * Now that we know what is what, implement or table this could in
2294          * theory be done slicker (it used to be), but this is
2295          * straightforward and easier to validate :-)
2296          */
2297         SCTPDBG(SCTP_DEBUG_OUTPUT3, "src_loop:%d src_priv:%d src_glob:%d\n",
2298             ifa->src_is_loop, ifa->src_is_priv, ifa->src_is_glob);
2299         SCTPDBG(SCTP_DEBUG_OUTPUT3, "dest_loop:%d dest_priv:%d dest_glob:%d\n",
2300             dest_is_loop, dest_is_priv, dest_is_global);
2301
2302         if ((ifa->src_is_loop) && (dest_is_priv)) {
2303                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:4\n");
2304                 return (NULL);
2305         }
2306         if ((ifa->src_is_glob) && (dest_is_priv)) {
2307                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:5\n");
2308                 return (NULL);
2309         }
2310         if ((ifa->src_is_loop) && (dest_is_global)) {
2311                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:6\n");
2312                 return (NULL);
2313         }
2314         if ((ifa->src_is_priv) && (dest_is_global)) {
2315                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:7\n");
2316                 return (NULL);
2317         }
2318         SCTPDBG(SCTP_DEBUG_OUTPUT3, "YES\n");
2319         /* its a preferred address */
2320         return (ifa);
2321 }
2322
2323 static struct sctp_ifa *
2324 sctp_is_ifa_addr_acceptable(struct sctp_ifa *ifa,
2325     uint8_t dest_is_loop,
2326     uint8_t dest_is_priv,
2327     sa_family_t fam)
2328 {
2329         uint8_t dest_is_global = 0;
2330
2331         /**
2332          * Here we determine if its a acceptable address. A acceptable
2333          * address means it is the same scope or higher scope but we can
2334          * allow for NAT which means its ok to have a global dest and a
2335          * private src.
2336          *
2337          * L = loopback, P = private, G = global
2338          * -----------------------------------------
2339          *  src    |  dest | result
2340          * -----------------------------------------
2341          *   L     |   L   |    yes
2342          *  -----------------------------------------
2343          *   P     |   L   |    yes-v4 no-v6
2344          *  -----------------------------------------
2345          *   G     |   L   |    yes
2346          * -----------------------------------------
2347          *   L     |   P   |    no
2348          * -----------------------------------------
2349          *   P     |   P   |    yes
2350          * -----------------------------------------
2351          *   G     |   P   |    yes - May not work
2352          * -----------------------------------------
2353          *   L     |   G   |    no
2354          * -----------------------------------------
2355          *   P     |   G   |    yes - May not work
2356          * -----------------------------------------
2357          *   G     |   G   |    yes
2358          * -----------------------------------------
2359          */
2360
2361         if (ifa->address.sa.sa_family != fam) {
2362                 /* forget non matching family */
2363                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "ifa_fam:%d fam:%d\n",
2364                     ifa->address.sa.sa_family, fam);
2365                 return (NULL);
2366         }
2367         /* Ok the address may be ok */
2368         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT3, &ifa->address.sa);
2369         SCTPDBG(SCTP_DEBUG_OUTPUT3, "dst_is_loop:%d dest_is_priv:%d\n",
2370             dest_is_loop, dest_is_priv);
2371         if ((dest_is_loop == 0) && (dest_is_priv == 0)) {
2372                 dest_is_global = 1;
2373         }
2374 #ifdef INET6
2375         if (fam == AF_INET6) {
2376                 /* ok to use deprecated addresses? */
2377                 if (ifa->localifa_flags & SCTP_ADDR_IFA_UNUSEABLE) {
2378                         return (NULL);
2379                 }
2380                 if (ifa->src_is_priv) {
2381                         /* Special case, linklocal to loop */
2382                         if (dest_is_loop)
2383                                 return (NULL);
2384                 }
2385         }
2386 #endif
2387         /*
2388          * Now that we know what is what, implement our table. This could in
2389          * theory be done slicker (it used to be), but this is
2390          * straightforward and easier to validate :-)
2391          */
2392         SCTPDBG(SCTP_DEBUG_OUTPUT3, "ifa->src_is_loop:%d dest_is_priv:%d\n",
2393             ifa->src_is_loop,
2394             dest_is_priv);
2395         if ((ifa->src_is_loop == 1) && (dest_is_priv)) {
2396                 return (NULL);
2397         }
2398         SCTPDBG(SCTP_DEBUG_OUTPUT3, "ifa->src_is_loop:%d dest_is_glob:%d\n",
2399             ifa->src_is_loop,
2400             dest_is_global);
2401         if ((ifa->src_is_loop == 1) && (dest_is_global)) {
2402                 return (NULL);
2403         }
2404         SCTPDBG(SCTP_DEBUG_OUTPUT3, "address is acceptable\n");
2405         /* its an acceptable address */
2406         return (ifa);
2407 }
2408
2409 int
2410 sctp_is_addr_restricted(struct sctp_tcb *stcb, struct sctp_ifa *ifa)
2411 {
2412         struct sctp_laddr *laddr;
2413
2414         if (stcb == NULL) {
2415                 /* There are no restrictions, no TCB :-) */
2416                 return (0);
2417         }
2418         LIST_FOREACH(laddr, &stcb->asoc.sctp_restricted_addrs, sctp_nxt_addr) {
2419                 if (laddr->ifa == NULL) {
2420                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "%s: NULL ifa\n",
2421                             __func__);
2422                         continue;
2423                 }
2424                 if (laddr->ifa == ifa) {
2425                         /* Yes it is on the list */
2426                         return (1);
2427                 }
2428         }
2429         return (0);
2430 }
2431
2432
2433 int
2434 sctp_is_addr_in_ep(struct sctp_inpcb *inp, struct sctp_ifa *ifa)
2435 {
2436         struct sctp_laddr *laddr;
2437
2438         if (ifa == NULL)
2439                 return (0);
2440         LIST_FOREACH(laddr, &inp->sctp_addr_list, sctp_nxt_addr) {
2441                 if (laddr->ifa == NULL) {
2442                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "%s: NULL ifa\n",
2443                             __func__);
2444                         continue;
2445                 }
2446                 if ((laddr->ifa == ifa) && laddr->action == 0)
2447                         /* same pointer */
2448                         return (1);
2449         }
2450         return (0);
2451 }
2452
2453
2454
2455 static struct sctp_ifa *
2456 sctp_choose_boundspecific_inp(struct sctp_inpcb *inp,
2457     sctp_route_t *ro,
2458     uint32_t vrf_id,
2459     int non_asoc_addr_ok,
2460     uint8_t dest_is_priv,
2461     uint8_t dest_is_loop,
2462     sa_family_t fam)
2463 {
2464         struct sctp_laddr *laddr, *starting_point;
2465         void *ifn;
2466         int resettotop = 0;
2467         struct sctp_ifn *sctp_ifn;
2468         struct sctp_ifa *sctp_ifa, *sifa;
2469         struct sctp_vrf *vrf;
2470         uint32_t ifn_index;
2471
2472         vrf = sctp_find_vrf(vrf_id);
2473         if (vrf == NULL)
2474                 return (NULL);
2475
2476         ifn = SCTP_GET_IFN_VOID_FROM_ROUTE(ro);
2477         ifn_index = SCTP_GET_IF_INDEX_FROM_ROUTE(ro);
2478         sctp_ifn = sctp_find_ifn(ifn, ifn_index);
2479         /*
2480          * first question, is the ifn we will emit on in our list, if so, we
2481          * want such an address. Note that we first looked for a preferred
2482          * address.
2483          */
2484         if (sctp_ifn) {
2485                 /* is a preferred one on the interface we route out? */
2486                 LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
2487 #ifdef INET
2488                         if ((sctp_ifa->address.sa.sa_family == AF_INET) &&
2489                             (prison_check_ip4(inp->ip_inp.inp.inp_cred,
2490                             &sctp_ifa->address.sin.sin_addr) != 0)) {
2491                                 continue;
2492                         }
2493 #endif
2494 #ifdef INET6
2495                         if ((sctp_ifa->address.sa.sa_family == AF_INET6) &&
2496                             (prison_check_ip6(inp->ip_inp.inp.inp_cred,
2497                             &sctp_ifa->address.sin6.sin6_addr) != 0)) {
2498                                 continue;
2499                         }
2500 #endif
2501                         if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
2502                             (non_asoc_addr_ok == 0))
2503                                 continue;
2504                         sifa = sctp_is_ifa_addr_preferred(sctp_ifa,
2505                             dest_is_loop,
2506                             dest_is_priv, fam);
2507                         if (sifa == NULL)
2508                                 continue;
2509                         if (sctp_is_addr_in_ep(inp, sifa)) {
2510                                 atomic_add_int(&sifa->refcount, 1);
2511                                 return (sifa);
2512                         }
2513                 }
2514         }
2515         /*
2516          * ok, now we now need to find one on the list of the addresses. We
2517          * can't get one on the emitting interface so let's find first a
2518          * preferred one. If not that an acceptable one otherwise... we
2519          * return NULL.
2520          */
2521         starting_point = inp->next_addr_touse;
2522 once_again:
2523         if (inp->next_addr_touse == NULL) {
2524                 inp->next_addr_touse = LIST_FIRST(&inp->sctp_addr_list);
2525                 resettotop = 1;
2526         }
2527         for (laddr = inp->next_addr_touse; laddr;
2528             laddr = LIST_NEXT(laddr, sctp_nxt_addr)) {
2529                 if (laddr->ifa == NULL) {
2530                         /* address has been removed */
2531                         continue;
2532                 }
2533                 if (laddr->action == SCTP_DEL_IP_ADDRESS) {
2534                         /* address is being deleted */
2535                         continue;
2536                 }
2537                 sifa = sctp_is_ifa_addr_preferred(laddr->ifa, dest_is_loop,
2538                     dest_is_priv, fam);
2539                 if (sifa == NULL)
2540                         continue;
2541                 atomic_add_int(&sifa->refcount, 1);
2542                 return (sifa);
2543         }
2544         if (resettotop == 0) {
2545                 inp->next_addr_touse = NULL;
2546                 goto once_again;
2547         }
2548
2549         inp->next_addr_touse = starting_point;
2550         resettotop = 0;
2551 once_again_too:
2552         if (inp->next_addr_touse == NULL) {
2553                 inp->next_addr_touse = LIST_FIRST(&inp->sctp_addr_list);
2554                 resettotop = 1;
2555         }
2556
2557         /* ok, what about an acceptable address in the inp */
2558         for (laddr = inp->next_addr_touse; laddr;
2559             laddr = LIST_NEXT(laddr, sctp_nxt_addr)) {
2560                 if (laddr->ifa == NULL) {
2561                         /* address has been removed */
2562                         continue;
2563                 }
2564                 if (laddr->action == SCTP_DEL_IP_ADDRESS) {
2565                         /* address is being deleted */
2566                         continue;
2567                 }
2568                 sifa = sctp_is_ifa_addr_acceptable(laddr->ifa, dest_is_loop,
2569                     dest_is_priv, fam);
2570                 if (sifa == NULL)
2571                         continue;
2572                 atomic_add_int(&sifa->refcount, 1);
2573                 return (sifa);
2574         }
2575         if (resettotop == 0) {
2576                 inp->next_addr_touse = NULL;
2577                 goto once_again_too;
2578         }
2579
2580         /*
2581          * no address bound can be a source for the destination we are in
2582          * trouble
2583          */
2584         return (NULL);
2585 }
2586
2587
2588
2589 static struct sctp_ifa *
2590 sctp_choose_boundspecific_stcb(struct sctp_inpcb *inp,
2591     struct sctp_tcb *stcb,
2592     sctp_route_t *ro,
2593     uint32_t vrf_id,
2594     uint8_t dest_is_priv,
2595     uint8_t dest_is_loop,
2596     int non_asoc_addr_ok,
2597     sa_family_t fam)
2598 {
2599         struct sctp_laddr *laddr, *starting_point;
2600         void *ifn;
2601         struct sctp_ifn *sctp_ifn;
2602         struct sctp_ifa *sctp_ifa, *sifa;
2603         uint8_t start_at_beginning = 0;
2604         struct sctp_vrf *vrf;
2605         uint32_t ifn_index;
2606
2607         /*
2608          * first question, is the ifn we will emit on in our list, if so, we
2609          * want that one.
2610          */
2611         vrf = sctp_find_vrf(vrf_id);
2612         if (vrf == NULL)
2613                 return (NULL);
2614
2615         ifn = SCTP_GET_IFN_VOID_FROM_ROUTE(ro);
2616         ifn_index = SCTP_GET_IF_INDEX_FROM_ROUTE(ro);
2617         sctp_ifn = sctp_find_ifn(ifn, ifn_index);
2618
2619         /*
2620          * first question, is the ifn we will emit on in our list?  If so,
2621          * we want that one. First we look for a preferred. Second, we go
2622          * for an acceptable.
2623          */
2624         if (sctp_ifn) {
2625                 /* first try for a preferred address on the ep */
2626                 LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
2627 #ifdef INET
2628                         if ((sctp_ifa->address.sa.sa_family == AF_INET) &&
2629                             (prison_check_ip4(inp->ip_inp.inp.inp_cred,
2630                             &sctp_ifa->address.sin.sin_addr) != 0)) {
2631                                 continue;
2632                         }
2633 #endif
2634 #ifdef INET6
2635                         if ((sctp_ifa->address.sa.sa_family == AF_INET6) &&
2636                             (prison_check_ip6(inp->ip_inp.inp.inp_cred,
2637                             &sctp_ifa->address.sin6.sin6_addr) != 0)) {
2638                                 continue;
2639                         }
2640 #endif
2641                         if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) && (non_asoc_addr_ok == 0))
2642                                 continue;
2643                         if (sctp_is_addr_in_ep(inp, sctp_ifa)) {
2644                                 sifa = sctp_is_ifa_addr_preferred(sctp_ifa, dest_is_loop, dest_is_priv, fam);
2645                                 if (sifa == NULL)
2646                                         continue;
2647                                 if (((non_asoc_addr_ok == 0) &&
2648                                     (sctp_is_addr_restricted(stcb, sifa))) ||
2649                                     (non_asoc_addr_ok &&
2650                                     (sctp_is_addr_restricted(stcb, sifa)) &&
2651                                     (!sctp_is_addr_pending(stcb, sifa)))) {
2652                                         /* on the no-no list */
2653                                         continue;
2654                                 }
2655                                 atomic_add_int(&sifa->refcount, 1);
2656                                 return (sifa);
2657                         }
2658                 }
2659                 /* next try for an acceptable address on the ep */
2660                 LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
2661 #ifdef INET
2662                         if ((sctp_ifa->address.sa.sa_family == AF_INET) &&
2663                             (prison_check_ip4(inp->ip_inp.inp.inp_cred,
2664                             &sctp_ifa->address.sin.sin_addr) != 0)) {
2665                                 continue;
2666                         }
2667 #endif
2668 #ifdef INET6
2669                         if ((sctp_ifa->address.sa.sa_family == AF_INET6) &&
2670                             (prison_check_ip6(inp->ip_inp.inp.inp_cred,
2671                             &sctp_ifa->address.sin6.sin6_addr) != 0)) {
2672                                 continue;
2673                         }
2674 #endif
2675                         if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) && (non_asoc_addr_ok == 0))
2676                                 continue;
2677                         if (sctp_is_addr_in_ep(inp, sctp_ifa)) {
2678                                 sifa = sctp_is_ifa_addr_acceptable(sctp_ifa, dest_is_loop, dest_is_priv, fam);
2679                                 if (sifa == NULL)
2680                                         continue;
2681                                 if (((non_asoc_addr_ok == 0) &&
2682                                     (sctp_is_addr_restricted(stcb, sifa))) ||
2683                                     (non_asoc_addr_ok &&
2684                                     (sctp_is_addr_restricted(stcb, sifa)) &&
2685                                     (!sctp_is_addr_pending(stcb, sifa)))) {
2686                                         /* on the no-no list */
2687                                         continue;
2688                                 }
2689                                 atomic_add_int(&sifa->refcount, 1);
2690                                 return (sifa);
2691                         }
2692                 }
2693
2694         }
2695         /*
2696          * if we can't find one like that then we must look at all addresses
2697          * bound to pick one at first preferable then secondly acceptable.
2698          */
2699         starting_point = stcb->asoc.last_used_address;
2700 sctp_from_the_top:
2701         if (stcb->asoc.last_used_address == NULL) {
2702                 start_at_beginning = 1;
2703                 stcb->asoc.last_used_address = LIST_FIRST(&inp->sctp_addr_list);
2704         }
2705         /* search beginning with the last used address */
2706         for (laddr = stcb->asoc.last_used_address; laddr;
2707             laddr = LIST_NEXT(laddr, sctp_nxt_addr)) {
2708                 if (laddr->ifa == NULL) {
2709                         /* address has been removed */
2710                         continue;
2711                 }
2712                 if (laddr->action == SCTP_DEL_IP_ADDRESS) {
2713                         /* address is being deleted */
2714                         continue;
2715                 }
2716                 sifa = sctp_is_ifa_addr_preferred(laddr->ifa, dest_is_loop, dest_is_priv, fam);
2717                 if (sifa == NULL)
2718                         continue;
2719                 if (((non_asoc_addr_ok == 0) &&
2720                     (sctp_is_addr_restricted(stcb, sifa))) ||
2721                     (non_asoc_addr_ok &&
2722                     (sctp_is_addr_restricted(stcb, sifa)) &&
2723                     (!sctp_is_addr_pending(stcb, sifa)))) {
2724                         /* on the no-no list */
2725                         continue;
2726                 }
2727                 stcb->asoc.last_used_address = laddr;
2728                 atomic_add_int(&sifa->refcount, 1);
2729                 return (sifa);
2730         }
2731         if (start_at_beginning == 0) {
2732                 stcb->asoc.last_used_address = NULL;
2733                 goto sctp_from_the_top;
2734         }
2735         /* now try for any higher scope than the destination */
2736         stcb->asoc.last_used_address = starting_point;
2737         start_at_beginning = 0;
2738 sctp_from_the_top2:
2739         if (stcb->asoc.last_used_address == NULL) {
2740                 start_at_beginning = 1;
2741                 stcb->asoc.last_used_address = LIST_FIRST(&inp->sctp_addr_list);
2742         }
2743         /* search beginning with the last used address */
2744         for (laddr = stcb->asoc.last_used_address; laddr;
2745             laddr = LIST_NEXT(laddr, sctp_nxt_addr)) {
2746                 if (laddr->ifa == NULL) {
2747                         /* address has been removed */
2748                         continue;
2749                 }
2750                 if (laddr->action == SCTP_DEL_IP_ADDRESS) {
2751                         /* address is being deleted */
2752                         continue;
2753                 }
2754                 sifa = sctp_is_ifa_addr_acceptable(laddr->ifa, dest_is_loop,
2755                     dest_is_priv, fam);
2756                 if (sifa == NULL)
2757                         continue;
2758                 if (((non_asoc_addr_ok == 0) &&
2759                     (sctp_is_addr_restricted(stcb, sifa))) ||
2760                     (non_asoc_addr_ok &&
2761                     (sctp_is_addr_restricted(stcb, sifa)) &&
2762                     (!sctp_is_addr_pending(stcb, sifa)))) {
2763                         /* on the no-no list */
2764                         continue;
2765                 }
2766                 stcb->asoc.last_used_address = laddr;
2767                 atomic_add_int(&sifa->refcount, 1);
2768                 return (sifa);
2769         }
2770         if (start_at_beginning == 0) {
2771                 stcb->asoc.last_used_address = NULL;
2772                 goto sctp_from_the_top2;
2773         }
2774         return (NULL);
2775 }
2776
2777 static struct sctp_ifa *
2778 sctp_select_nth_preferred_addr_from_ifn_boundall(struct sctp_ifn *ifn,
2779     struct sctp_inpcb *inp,
2780     struct sctp_tcb *stcb,
2781     int non_asoc_addr_ok,
2782     uint8_t dest_is_loop,
2783     uint8_t dest_is_priv,
2784     int addr_wanted,
2785     sa_family_t fam,
2786     sctp_route_t *ro
2787 )
2788 {
2789         struct sctp_ifa *ifa, *sifa;
2790         int num_eligible_addr = 0;
2791 #ifdef INET6
2792         struct sockaddr_in6 sin6, lsa6;
2793
2794         if (fam == AF_INET6) {
2795                 memcpy(&sin6, &ro->ro_dst, sizeof(struct sockaddr_in6));
2796                 (void)sa6_recoverscope(&sin6);
2797         }
2798 #endif                          /* INET6 */
2799         LIST_FOREACH(ifa, &ifn->ifalist, next_ifa) {
2800 #ifdef INET
2801                 if ((ifa->address.sa.sa_family == AF_INET) &&
2802                     (prison_check_ip4(inp->ip_inp.inp.inp_cred,
2803                     &ifa->address.sin.sin_addr) != 0)) {
2804                         continue;
2805                 }
2806 #endif
2807 #ifdef INET6
2808                 if ((ifa->address.sa.sa_family == AF_INET6) &&
2809                     (prison_check_ip6(inp->ip_inp.inp.inp_cred,
2810                     &ifa->address.sin6.sin6_addr) != 0)) {
2811                         continue;
2812                 }
2813 #endif
2814                 if ((ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
2815                     (non_asoc_addr_ok == 0))
2816                         continue;
2817                 sifa = sctp_is_ifa_addr_preferred(ifa, dest_is_loop,
2818                     dest_is_priv, fam);
2819                 if (sifa == NULL)
2820                         continue;
2821 #ifdef INET6
2822                 if (fam == AF_INET6 &&
2823                     dest_is_loop &&
2824                     sifa->src_is_loop && sifa->src_is_priv) {
2825                         /*
2826                          * don't allow fe80::1 to be a src on loop ::1, we
2827                          * don't list it to the peer so we will get an
2828                          * abort.
2829                          */
2830                         continue;
2831                 }
2832                 if (fam == AF_INET6 &&
2833                     IN6_IS_ADDR_LINKLOCAL(&sifa->address.sin6.sin6_addr) &&
2834                     IN6_IS_ADDR_LINKLOCAL(&sin6.sin6_addr)) {
2835                         /*
2836                          * link-local <-> link-local must belong to the same
2837                          * scope.
2838                          */
2839                         memcpy(&lsa6, &sifa->address.sin6, sizeof(struct sockaddr_in6));
2840                         (void)sa6_recoverscope(&lsa6);
2841                         if (sin6.sin6_scope_id != lsa6.sin6_scope_id) {
2842                                 continue;
2843                         }
2844                 }
2845 #endif                          /* INET6 */
2846
2847                 /*
2848                  * Check if the IPv6 address matches to next-hop. In the
2849                  * mobile case, old IPv6 address may be not deleted from the
2850                  * interface. Then, the interface has previous and new
2851                  * addresses.  We should use one corresponding to the
2852                  * next-hop.  (by micchie)
2853                  */
2854 #ifdef INET6
2855                 if (stcb && fam == AF_INET6 &&
2856                     sctp_is_mobility_feature_on(stcb->sctp_ep, SCTP_MOBILITY_BASE)) {
2857                         if (sctp_v6src_match_nexthop(&sifa->address.sin6, ro)
2858                             == 0) {
2859                                 continue;
2860                         }
2861                 }
2862 #endif
2863 #ifdef INET
2864                 /* Avoid topologically incorrect IPv4 address */
2865                 if (stcb && fam == AF_INET &&
2866                     sctp_is_mobility_feature_on(stcb->sctp_ep, SCTP_MOBILITY_BASE)) {
2867                         if (sctp_v4src_match_nexthop(sifa, ro) == 0) {
2868                                 continue;
2869                         }
2870                 }
2871 #endif
2872                 if (stcb) {
2873                         if (sctp_is_address_in_scope(ifa, &stcb->asoc.scope, 0) == 0) {
2874                                 continue;
2875                         }
2876                         if (((non_asoc_addr_ok == 0) &&
2877                             (sctp_is_addr_restricted(stcb, sifa))) ||
2878                             (non_asoc_addr_ok &&
2879                             (sctp_is_addr_restricted(stcb, sifa)) &&
2880                             (!sctp_is_addr_pending(stcb, sifa)))) {
2881                                 /*
2882                                  * It is restricted for some reason..
2883                                  * probably not yet added.
2884                                  */
2885                                 continue;
2886                         }
2887                 }
2888                 if (num_eligible_addr >= addr_wanted) {
2889                         return (sifa);
2890                 }
2891                 num_eligible_addr++;
2892         }
2893         return (NULL);
2894 }
2895
2896
2897 static int
2898 sctp_count_num_preferred_boundall(struct sctp_ifn *ifn,
2899     struct sctp_inpcb *inp,
2900     struct sctp_tcb *stcb,
2901     int non_asoc_addr_ok,
2902     uint8_t dest_is_loop,
2903     uint8_t dest_is_priv,
2904     sa_family_t fam)
2905 {
2906         struct sctp_ifa *ifa, *sifa;
2907         int num_eligible_addr = 0;
2908
2909         LIST_FOREACH(ifa, &ifn->ifalist, next_ifa) {
2910 #ifdef INET
2911                 if ((ifa->address.sa.sa_family == AF_INET) &&
2912                     (prison_check_ip4(inp->ip_inp.inp.inp_cred,
2913                     &ifa->address.sin.sin_addr) != 0)) {
2914                         continue;
2915                 }
2916 #endif
2917 #ifdef INET6
2918                 if ((ifa->address.sa.sa_family == AF_INET6) &&
2919                     (stcb != NULL) &&
2920                     (prison_check_ip6(inp->ip_inp.inp.inp_cred,
2921                     &ifa->address.sin6.sin6_addr) != 0)) {
2922                         continue;
2923                 }
2924 #endif
2925                 if ((ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
2926                     (non_asoc_addr_ok == 0)) {
2927                         continue;
2928                 }
2929                 sifa = sctp_is_ifa_addr_preferred(ifa, dest_is_loop,
2930                     dest_is_priv, fam);
2931                 if (sifa == NULL) {
2932                         continue;
2933                 }
2934                 if (stcb) {
2935                         if (sctp_is_address_in_scope(ifa, &stcb->asoc.scope, 0) == 0) {
2936                                 continue;
2937                         }
2938                         if (((non_asoc_addr_ok == 0) &&
2939                             (sctp_is_addr_restricted(stcb, sifa))) ||
2940                             (non_asoc_addr_ok &&
2941                             (sctp_is_addr_restricted(stcb, sifa)) &&
2942                             (!sctp_is_addr_pending(stcb, sifa)))) {
2943                                 /*
2944                                  * It is restricted for some reason..
2945                                  * probably not yet added.
2946                                  */
2947                                 continue;
2948                         }
2949                 }
2950                 num_eligible_addr++;
2951         }
2952         return (num_eligible_addr);
2953 }
2954
2955 static struct sctp_ifa *
2956 sctp_choose_boundall(struct sctp_inpcb *inp,
2957     struct sctp_tcb *stcb,
2958     struct sctp_nets *net,
2959     sctp_route_t *ro,
2960     uint32_t vrf_id,
2961     uint8_t dest_is_priv,
2962     uint8_t dest_is_loop,
2963     int non_asoc_addr_ok,
2964     sa_family_t fam)
2965 {
2966         int cur_addr_num = 0, num_preferred = 0;
2967         void *ifn;
2968         struct sctp_ifn *sctp_ifn, *looked_at = NULL, *emit_ifn;
2969         struct sctp_ifa *sctp_ifa, *sifa;
2970         uint32_t ifn_index;
2971         struct sctp_vrf *vrf;
2972 #ifdef INET
2973         int retried = 0;
2974 #endif
2975
2976         /*-
2977          * For boundall we can use any address in the association.
2978          * If non_asoc_addr_ok is set we can use any address (at least in
2979          * theory). So we look for preferred addresses first. If we find one,
2980          * we use it. Otherwise we next try to get an address on the
2981          * interface, which we should be able to do (unless non_asoc_addr_ok
2982          * is false and we are routed out that way). In these cases where we
2983          * can't use the address of the interface we go through all the
2984          * ifn's looking for an address we can use and fill that in. Punting
2985          * means we send back address 0, which will probably cause problems
2986          * actually since then IP will fill in the address of the route ifn,
2987          * which means we probably already rejected it.. i.e. here comes an
2988          * abort :-<.
2989          */
2990         vrf = sctp_find_vrf(vrf_id);
2991         if (vrf == NULL)
2992                 return (NULL);
2993
2994         ifn = SCTP_GET_IFN_VOID_FROM_ROUTE(ro);
2995         ifn_index = SCTP_GET_IF_INDEX_FROM_ROUTE(ro);
2996         SCTPDBG(SCTP_DEBUG_OUTPUT2, "ifn from route:%p ifn_index:%d\n", ifn, ifn_index);
2997         emit_ifn = looked_at = sctp_ifn = sctp_find_ifn(ifn, ifn_index);
2998         if (sctp_ifn == NULL) {
2999                 /* ?? We don't have this guy ?? */
3000                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "No ifn emit interface?\n");
3001                 goto bound_all_plan_b;
3002         }
3003         SCTPDBG(SCTP_DEBUG_OUTPUT2, "ifn_index:%d name:%s is emit interface\n",
3004             ifn_index, sctp_ifn->ifn_name);
3005
3006         if (net) {
3007                 cur_addr_num = net->indx_of_eligible_next_to_use;
3008         }
3009         num_preferred = sctp_count_num_preferred_boundall(sctp_ifn,
3010             inp, stcb,
3011             non_asoc_addr_ok,
3012             dest_is_loop,
3013             dest_is_priv, fam);
3014         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Found %d preferred source addresses for intf:%s\n",
3015             num_preferred, sctp_ifn->ifn_name);
3016         if (num_preferred == 0) {
3017                 /*
3018                  * no eligible addresses, we must use some other interface
3019                  * address if we can find one.
3020                  */
3021                 goto bound_all_plan_b;
3022         }
3023         /*
3024          * Ok we have num_eligible_addr set with how many we can use, this
3025          * may vary from call to call due to addresses being deprecated
3026          * etc..
3027          */
3028         if (cur_addr_num >= num_preferred) {
3029                 cur_addr_num = 0;
3030         }
3031         /*
3032          * select the nth address from the list (where cur_addr_num is the
3033          * nth) and 0 is the first one, 1 is the second one etc...
3034          */
3035         SCTPDBG(SCTP_DEBUG_OUTPUT2, "cur_addr_num:%d\n", cur_addr_num);
3036
3037         sctp_ifa = sctp_select_nth_preferred_addr_from_ifn_boundall(sctp_ifn, inp, stcb, non_asoc_addr_ok, dest_is_loop,
3038             dest_is_priv, cur_addr_num, fam, ro);
3039
3040         /* if sctp_ifa is NULL something changed??, fall to plan b. */
3041         if (sctp_ifa) {
3042                 atomic_add_int(&sctp_ifa->refcount, 1);
3043                 if (net) {
3044                         /* save off where the next one we will want */
3045                         net->indx_of_eligible_next_to_use = cur_addr_num + 1;
3046                 }
3047                 return (sctp_ifa);
3048         }
3049         /*
3050          * plan_b: Look at all interfaces and find a preferred address. If
3051          * no preferred fall through to plan_c.
3052          */
3053 bound_all_plan_b:
3054         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Trying Plan B\n");
3055         LIST_FOREACH(sctp_ifn, &vrf->ifnlist, next_ifn) {
3056                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "Examine interface %s\n",
3057                     sctp_ifn->ifn_name);
3058                 if (dest_is_loop == 0 && SCTP_IFN_IS_IFT_LOOP(sctp_ifn)) {
3059                         /* wrong base scope */
3060                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "skip\n");
3061                         continue;
3062                 }
3063                 if ((sctp_ifn == looked_at) && looked_at) {
3064                         /* already looked at this guy */
3065                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "already seen\n");
3066                         continue;
3067                 }
3068                 num_preferred = sctp_count_num_preferred_boundall(sctp_ifn, inp, stcb, non_asoc_addr_ok,
3069                     dest_is_loop, dest_is_priv, fam);
3070                 SCTPDBG(SCTP_DEBUG_OUTPUT2,
3071                     "Found ifn:%p %d preferred source addresses\n",
3072                     ifn, num_preferred);
3073                 if (num_preferred == 0) {
3074                         /* None on this interface. */
3075                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "No preferred -- skipping to next\n");
3076                         continue;
3077                 }
3078                 SCTPDBG(SCTP_DEBUG_OUTPUT2,
3079                     "num preferred:%d on interface:%p cur_addr_num:%d\n",
3080                     num_preferred, (void *)sctp_ifn, cur_addr_num);
3081
3082                 /*
3083                  * Ok we have num_eligible_addr set with how many we can
3084                  * use, this may vary from call to call due to addresses
3085                  * being deprecated etc..
3086                  */
3087                 if (cur_addr_num >= num_preferred) {
3088                         cur_addr_num = 0;
3089                 }
3090                 sifa = sctp_select_nth_preferred_addr_from_ifn_boundall(sctp_ifn, inp, stcb, non_asoc_addr_ok, dest_is_loop,
3091                     dest_is_priv, cur_addr_num, fam, ro);
3092                 if (sifa == NULL)
3093                         continue;
3094                 if (net) {
3095                         net->indx_of_eligible_next_to_use = cur_addr_num + 1;
3096                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "we selected %d\n",
3097                             cur_addr_num);
3098                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Source:");
3099                         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, &sifa->address.sa);
3100                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Dest:");
3101                         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, &net->ro._l_addr.sa);
3102                 }
3103                 atomic_add_int(&sifa->refcount, 1);
3104                 return (sifa);
3105         }
3106 #ifdef INET
3107 again_with_private_addresses_allowed:
3108 #endif
3109         /* plan_c: do we have an acceptable address on the emit interface */
3110         sifa = NULL;
3111         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Trying Plan C: find acceptable on interface\n");
3112         if (emit_ifn == NULL) {
3113                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "Jump to Plan D - no emit_ifn\n");
3114                 goto plan_d;
3115         }
3116         LIST_FOREACH(sctp_ifa, &emit_ifn->ifalist, next_ifa) {
3117                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "ifa:%p\n", (void *)sctp_ifa);
3118 #ifdef INET
3119                 if ((sctp_ifa->address.sa.sa_family == AF_INET) &&
3120                     (prison_check_ip4(inp->ip_inp.inp.inp_cred,
3121                     &sctp_ifa->address.sin.sin_addr) != 0)) {
3122                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Jailed\n");
3123                         continue;
3124                 }
3125 #endif
3126 #ifdef INET6
3127                 if ((sctp_ifa->address.sa.sa_family == AF_INET6) &&
3128                     (prison_check_ip6(inp->ip_inp.inp.inp_cred,
3129                     &sctp_ifa->address.sin6.sin6_addr) != 0)) {
3130                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Jailed\n");
3131                         continue;
3132                 }
3133 #endif
3134                 if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
3135                     (non_asoc_addr_ok == 0)) {
3136                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Defer\n");
3137                         continue;
3138                 }
3139                 sifa = sctp_is_ifa_addr_acceptable(sctp_ifa, dest_is_loop,
3140                     dest_is_priv, fam);
3141                 if (sifa == NULL) {
3142                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "IFA not acceptable\n");
3143                         continue;
3144                 }
3145                 if (stcb) {
3146                         if (sctp_is_address_in_scope(sifa, &stcb->asoc.scope, 0) == 0) {
3147                                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "NOT in scope\n");
3148                                 sifa = NULL;
3149                                 continue;
3150                         }
3151                         if (((non_asoc_addr_ok == 0) &&
3152                             (sctp_is_addr_restricted(stcb, sifa))) ||
3153                             (non_asoc_addr_ok &&
3154                             (sctp_is_addr_restricted(stcb, sifa)) &&
3155                             (!sctp_is_addr_pending(stcb, sifa)))) {
3156                                 /*
3157                                  * It is restricted for some reason..
3158                                  * probably not yet added.
3159                                  */
3160                                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "Its restricted\n");
3161                                 sifa = NULL;
3162                                 continue;
3163                         }
3164                 }
3165                 atomic_add_int(&sifa->refcount, 1);
3166                 goto out;
3167         }
3168 plan_d:
3169         /*
3170          * plan_d: We are in trouble. No preferred address on the emit
3171          * interface. And not even a preferred address on all interfaces. Go
3172          * out and see if we can find an acceptable address somewhere
3173          * amongst all interfaces.
3174          */
3175         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Trying Plan D looked_at is %p\n", (void *)looked_at);
3176         LIST_FOREACH(sctp_ifn, &vrf->ifnlist, next_ifn) {
3177                 if (dest_is_loop == 0 && SCTP_IFN_IS_IFT_LOOP(sctp_ifn)) {
3178                         /* wrong base scope */
3179                         continue;
3180                 }
3181                 LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
3182 #ifdef INET
3183                         if ((sctp_ifa->address.sa.sa_family == AF_INET) &&
3184                             (prison_check_ip4(inp->ip_inp.inp.inp_cred,
3185                             &sctp_ifa->address.sin.sin_addr) != 0)) {
3186                                 continue;
3187                         }
3188 #endif
3189 #ifdef INET6
3190                         if ((sctp_ifa->address.sa.sa_family == AF_INET6) &&
3191                             (prison_check_ip6(inp->ip_inp.inp.inp_cred,
3192                             &sctp_ifa->address.sin6.sin6_addr) != 0)) {
3193                                 continue;
3194                         }
3195 #endif
3196                         if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
3197                             (non_asoc_addr_ok == 0))
3198                                 continue;
3199                         sifa = sctp_is_ifa_addr_acceptable(sctp_ifa,
3200                             dest_is_loop,
3201                             dest_is_priv, fam);
3202                         if (sifa == NULL)
3203                                 continue;
3204                         if (stcb) {
3205                                 if (sctp_is_address_in_scope(sifa, &stcb->asoc.scope, 0) == 0) {
3206                                         sifa = NULL;
3207                                         continue;
3208                                 }
3209                                 if (((non_asoc_addr_ok == 0) &&
3210                                     (sctp_is_addr_restricted(stcb, sifa))) ||
3211                                     (non_asoc_addr_ok &&
3212                                     (sctp_is_addr_restricted(stcb, sifa)) &&
3213                                     (!sctp_is_addr_pending(stcb, sifa)))) {
3214                                         /*
3215                                          * It is restricted for some
3216                                          * reason.. probably not yet added.
3217                                          */
3218                                         sifa = NULL;
3219                                         continue;
3220                                 }
3221                         }
3222                         goto out;
3223                 }
3224         }
3225 #ifdef INET
3226         if (stcb) {
3227                 if ((retried == 0) && (stcb->asoc.scope.ipv4_local_scope == 0)) {
3228                         stcb->asoc.scope.ipv4_local_scope = 1;
3229                         retried = 1;
3230                         goto again_with_private_addresses_allowed;
3231                 } else if (retried == 1) {
3232                         stcb->asoc.scope.ipv4_local_scope = 0;
3233                 }
3234         }
3235 #endif
3236 out:
3237 #ifdef INET
3238         if (sifa) {
3239                 if (retried == 1) {
3240                         LIST_FOREACH(sctp_ifn, &vrf->ifnlist, next_ifn) {
3241                                 if (dest_is_loop == 0 && SCTP_IFN_IS_IFT_LOOP(sctp_ifn)) {
3242                                         /* wrong base scope */
3243                                         continue;
3244                                 }
3245                                 LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
3246                                         struct sctp_ifa *tmp_sifa;
3247
3248 #ifdef INET
3249                                         if ((sctp_ifa->address.sa.sa_family == AF_INET) &&
3250                                             (prison_check_ip4(inp->ip_inp.inp.inp_cred,
3251                                             &sctp_ifa->address.sin.sin_addr) != 0)) {
3252                                                 continue;
3253                                         }
3254 #endif
3255 #ifdef INET6
3256                                         if ((sctp_ifa->address.sa.sa_family == AF_INET6) &&
3257                                             (prison_check_ip6(inp->ip_inp.inp.inp_cred,
3258                                             &sctp_ifa->address.sin6.sin6_addr) != 0)) {
3259                                                 continue;
3260                                         }
3261 #endif
3262                                         if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
3263                                             (non_asoc_addr_ok == 0))
3264                                                 continue;
3265                                         tmp_sifa = sctp_is_ifa_addr_acceptable(sctp_ifa,
3266                                             dest_is_loop,
3267                                             dest_is_priv, fam);
3268                                         if (tmp_sifa == NULL) {
3269                                                 continue;
3270                                         }
3271                                         if (tmp_sifa == sifa) {
3272                                                 continue;
3273                                         }
3274                                         if (stcb) {
3275                                                 if (sctp_is_address_in_scope(tmp_sifa,
3276                                                     &stcb->asoc.scope, 0) == 0) {
3277                                                         continue;
3278                                                 }
3279                                                 if (((non_asoc_addr_ok == 0) &&
3280                                                     (sctp_is_addr_restricted(stcb, tmp_sifa))) ||
3281                                                     (non_asoc_addr_ok &&
3282                                                     (sctp_is_addr_restricted(stcb, tmp_sifa)) &&
3283                                                     (!sctp_is_addr_pending(stcb, tmp_sifa)))) {
3284                                                         /*
3285                                                          * It is restricted
3286                                                          * for some reason..
3287                                                          * probably not yet
3288                                                          * added.
3289                                                          */
3290                                                         continue;
3291                                                 }
3292                                         }
3293                                         if ((tmp_sifa->address.sin.sin_family == AF_INET) &&
3294                                             (IN4_ISPRIVATE_ADDRESS(&(tmp_sifa->address.sin.sin_addr)))) {
3295                                                 sctp_add_local_addr_restricted(stcb, tmp_sifa);
3296                                         }
3297                                 }
3298                         }
3299                 }
3300                 atomic_add_int(&sifa->refcount, 1);
3301         }
3302 #endif
3303         return (sifa);
3304 }
3305
3306
3307
3308 /* tcb may be NULL */
3309 struct sctp_ifa *
3310 sctp_source_address_selection(struct sctp_inpcb *inp,
3311     struct sctp_tcb *stcb,
3312     sctp_route_t *ro,
3313     struct sctp_nets *net,
3314     int non_asoc_addr_ok, uint32_t vrf_id)
3315 {
3316         struct sctp_ifa *answer;
3317         uint8_t dest_is_priv, dest_is_loop;
3318         sa_family_t fam;
3319 #ifdef INET
3320         struct sockaddr_in *to = (struct sockaddr_in *)&ro->ro_dst;
3321 #endif
3322 #ifdef INET6
3323         struct sockaddr_in6 *to6 = (struct sockaddr_in6 *)&ro->ro_dst;
3324 #endif
3325
3326         /**
3327          * Rules:
3328          * - Find the route if needed, cache if I can.
3329          * - Look at interface address in route, Is it in the bound list. If so we
3330          *   have the best source.
3331          * - If not we must rotate amongst the addresses.
3332          *
3333          * Cavets and issues
3334          *
3335          * Do we need to pay attention to scope. We can have a private address
3336          * or a global address we are sourcing or sending to. So if we draw
3337          * it out
3338          * zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz
3339          * For V4
3340          * ------------------------------------------
3341          *      source     *      dest  *  result
3342          * -----------------------------------------
3343          * <a>  Private    *    Global  *  NAT
3344          * -----------------------------------------
3345          * <b>  Private    *    Private *  No problem
3346          * -----------------------------------------
3347          * <c>  Global     *    Private *  Huh, How will this work?
3348          * -----------------------------------------
3349          * <d>  Global     *    Global  *  No Problem
3350          *------------------------------------------
3351          * zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz
3352          * For V6
3353          *------------------------------------------
3354          *      source     *      dest  *  result
3355          * -----------------------------------------
3356          * <a>  Linklocal  *    Global  *
3357          * -----------------------------------------
3358          * <b>  Linklocal  * Linklocal  *  No problem
3359          * -----------------------------------------
3360          * <c>  Global     * Linklocal  *  Huh, How will this work?
3361          * -----------------------------------------
3362          * <d>  Global     *    Global  *  No Problem
3363          *------------------------------------------
3364          * zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz
3365          *
3366          * And then we add to that what happens if there are multiple addresses
3367          * assigned to an interface. Remember the ifa on a ifn is a linked
3368          * list of addresses. So one interface can have more than one IP
3369          * address. What happens if we have both a private and a global
3370          * address? Do we then use context of destination to sort out which
3371          * one is best? And what about NAT's sending P->G may get you a NAT
3372          * translation, or should you select the G thats on the interface in
3373          * preference.
3374          *
3375          * Decisions:
3376          *
3377          * - count the number of addresses on the interface.
3378          * - if it is one, no problem except case <c>.
3379          *   For <a> we will assume a NAT out there.
3380          * - if there are more than one, then we need to worry about scope P
3381          *   or G. We should prefer G -> G and P -> P if possible.
3382          *   Then as a secondary fall back to mixed types G->P being a last
3383          *   ditch one.
3384          * - The above all works for bound all, but bound specific we need to
3385          *   use the same concept but instead only consider the bound
3386          *   addresses. If the bound set is NOT assigned to the interface then
3387          *   we must use rotation amongst the bound addresses..
3388          */
3389         if (ro->ro_rt == NULL) {
3390                 /*
3391                  * Need a route to cache.
3392                  */
3393                 SCTP_RTALLOC(ro, vrf_id, inp->fibnum);
3394         }
3395         if (ro->ro_rt == NULL) {
3396                 return (NULL);
3397         }
3398         fam = ro->ro_dst.sa_family;
3399         dest_is_priv = dest_is_loop = 0;
3400         /* Setup our scopes for the destination */
3401         switch (fam) {
3402 #ifdef INET
3403         case AF_INET:
3404                 /* Scope based on outbound address */
3405                 if (IN4_ISLOOPBACK_ADDRESS(&to->sin_addr)) {
3406                         dest_is_loop = 1;
3407                         if (net != NULL) {
3408                                 /* mark it as local */
3409                                 net->addr_is_local = 1;
3410                         }
3411                 } else if ((IN4_ISPRIVATE_ADDRESS(&to->sin_addr))) {
3412                         dest_is_priv = 1;
3413                 }
3414                 break;
3415 #endif
3416 #ifdef INET6
3417         case AF_INET6:
3418                 /* Scope based on outbound address */
3419                 if (IN6_IS_ADDR_LOOPBACK(&to6->sin6_addr) ||
3420                     SCTP_ROUTE_IS_REAL_LOOP(ro)) {
3421                         /*
3422                          * If the address is a loopback address, which
3423                          * consists of "::1" OR "fe80::1%lo0", we are
3424                          * loopback scope. But we don't use dest_is_priv
3425                          * (link local addresses).
3426                          */
3427                         dest_is_loop = 1;
3428                         if (net != NULL) {
3429                                 /* mark it as local */
3430                                 net->addr_is_local = 1;
3431                         }
3432                 } else if (IN6_IS_ADDR_LINKLOCAL(&to6->sin6_addr)) {
3433                         dest_is_priv = 1;
3434                 }
3435                 break;
3436 #endif
3437         }
3438         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Select source addr for:");
3439         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)&ro->ro_dst);
3440         SCTP_IPI_ADDR_RLOCK();
3441         if (inp->sctp_flags & SCTP_PCB_FLAGS_BOUNDALL) {
3442                 /*
3443                  * Bound all case
3444                  */
3445                 answer = sctp_choose_boundall(inp, stcb, net, ro, vrf_id,
3446                     dest_is_priv, dest_is_loop,
3447                     non_asoc_addr_ok, fam);
3448                 SCTP_IPI_ADDR_RUNLOCK();
3449                 return (answer);
3450         }
3451         /*
3452          * Subset bound case
3453          */
3454         if (stcb) {
3455                 answer = sctp_choose_boundspecific_stcb(inp, stcb, ro,
3456                     vrf_id, dest_is_priv,
3457                     dest_is_loop,
3458                     non_asoc_addr_ok, fam);
3459         } else {
3460                 answer = sctp_choose_boundspecific_inp(inp, ro, vrf_id,
3461                     non_asoc_addr_ok,
3462                     dest_is_priv,
3463                     dest_is_loop, fam);
3464         }
3465         SCTP_IPI_ADDR_RUNLOCK();
3466         return (answer);
3467 }
3468
3469 static int
3470 sctp_find_cmsg(int c_type, void *data, struct mbuf *control, size_t cpsize)
3471 {
3472         struct cmsghdr cmh;
3473         struct sctp_sndinfo sndinfo;
3474         struct sctp_prinfo prinfo;
3475         struct sctp_authinfo authinfo;
3476         int tot_len, rem_len, cmsg_data_len, cmsg_data_off, off;
3477         int found;
3478
3479         /*
3480          * Independent of how many mbufs, find the c_type inside the control
3481          * structure and copy out the data.
3482          */
3483         found = 0;
3484         tot_len = SCTP_BUF_LEN(control);
3485         for (off = 0; off < tot_len; off += CMSG_ALIGN(cmh.cmsg_len)) {
3486                 rem_len = tot_len - off;
3487                 if (rem_len < (int)CMSG_ALIGN(sizeof(cmh))) {
3488                         /* There is not enough room for one more. */
3489                         return (found);
3490                 }
3491                 m_copydata(control, off, sizeof(cmh), (caddr_t)&cmh);
3492                 if (cmh.cmsg_len < CMSG_ALIGN(sizeof(cmh))) {
3493                         /* We dont't have a complete CMSG header. */
3494                         return (found);
3495                 }
3496                 if ((cmh.cmsg_len > INT_MAX) || ((int)cmh.cmsg_len > rem_len)) {
3497                         /* We don't have the complete CMSG. */
3498                         return (found);
3499                 }
3500                 cmsg_data_len = (int)cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh));
3501                 cmsg_data_off = off + CMSG_ALIGN(sizeof(cmh));
3502                 if ((cmh.cmsg_level == IPPROTO_SCTP) &&
3503                     ((c_type == cmh.cmsg_type) ||
3504                     ((c_type == SCTP_SNDRCV) &&
3505                     ((cmh.cmsg_type == SCTP_SNDINFO) ||
3506                     (cmh.cmsg_type == SCTP_PRINFO) ||
3507                     (cmh.cmsg_type == SCTP_AUTHINFO))))) {
3508                         if (c_type == cmh.cmsg_type) {
3509                                 if (cpsize > INT_MAX) {
3510                                         return (found);
3511                                 }
3512                                 if (cmsg_data_len < (int)cpsize) {
3513                                         return (found);
3514                                 }
3515                                 /* It is exactly what we want. Copy it out. */
3516                                 m_copydata(control, cmsg_data_off, (int)cpsize, (caddr_t)data);
3517                                 return (1);
3518                         } else {
3519                                 struct sctp_sndrcvinfo *sndrcvinfo;
3520
3521                                 sndrcvinfo = (struct sctp_sndrcvinfo *)data;
3522                                 if (found == 0) {
3523                                         if (cpsize < sizeof(struct sctp_sndrcvinfo)) {
3524                                                 return (found);
3525                                         }
3526                                         memset(sndrcvinfo, 0, sizeof(struct sctp_sndrcvinfo));
3527                                 }
3528                                 switch (cmh.cmsg_type) {
3529                                 case SCTP_SNDINFO:
3530                                         if (cmsg_data_len < (int)sizeof(struct sctp_sndinfo)) {
3531                                                 return (found);
3532                                         }
3533                                         m_copydata(control, cmsg_data_off, sizeof(struct sctp_sndinfo), (caddr_t)&sndinfo);
3534                                         sndrcvinfo->sinfo_stream = sndinfo.snd_sid;
3535                                         sndrcvinfo->sinfo_flags = sndinfo.snd_flags;
3536                                         sndrcvinfo->sinfo_ppid = sndinfo.snd_ppid;
3537                                         sndrcvinfo->sinfo_context = sndinfo.snd_context;
3538                                         sndrcvinfo->sinfo_assoc_id = sndinfo.snd_assoc_id;
3539                                         break;
3540                                 case SCTP_PRINFO:
3541                                         if (cmsg_data_len < (int)sizeof(struct sctp_prinfo)) {
3542                                                 return (found);
3543                                         }
3544                                         m_copydata(control, cmsg_data_off, sizeof(struct sctp_prinfo), (caddr_t)&prinfo);
3545                                         if (prinfo.pr_policy != SCTP_PR_SCTP_NONE) {
3546                                                 sndrcvinfo->sinfo_timetolive = prinfo.pr_value;
3547                                         } else {
3548                                                 sndrcvinfo->sinfo_timetolive = 0;
3549                                         }
3550                                         sndrcvinfo->sinfo_flags |= prinfo.pr_policy;
3551                                         break;
3552                                 case SCTP_AUTHINFO:
3553                                         if (cmsg_data_len < (int)sizeof(struct sctp_authinfo)) {
3554                                                 return (found);
3555                                         }
3556                                         m_copydata(control, cmsg_data_off, sizeof(struct sctp_authinfo), (caddr_t)&authinfo);
3557                                         sndrcvinfo->sinfo_keynumber_valid = 1;
3558                                         sndrcvinfo->sinfo_keynumber = authinfo.auth_keynumber;
3559                                         break;
3560                                 default:
3561                                         return (found);
3562                                 }
3563                                 found = 1;
3564                         }
3565                 }
3566         }
3567         return (found);
3568 }
3569
3570 static int
3571 sctp_process_cmsgs_for_init(struct sctp_tcb *stcb, struct mbuf *control, int *error)
3572 {
3573         struct cmsghdr cmh;
3574         int tlen, at;
3575         struct sctp_initmsg initmsg;
3576 #ifdef INET
3577         struct sockaddr_in sin;
3578 #endif
3579 #ifdef INET6
3580         struct sockaddr_in6 sin6;
3581 #endif
3582
3583         tlen = SCTP_BUF_LEN(control);
3584         at = 0;
3585         while (at < tlen) {
3586                 if ((tlen - at) < (int)CMSG_ALIGN(sizeof(cmh))) {
3587                         /* There is not enough room for one more. */
3588                         *error = EINVAL;
3589                         return (1);
3590                 }
3591                 m_copydata(control, at, sizeof(cmh), (caddr_t)&cmh);
3592                 if (cmh.cmsg_len < CMSG_ALIGN(sizeof(cmh))) {
3593                         /* We dont't have a complete CMSG header. */
3594                         *error = EINVAL;
3595                         return (1);
3596                 }
3597                 if (((int)cmh.cmsg_len + at) > tlen) {
3598                         /* We don't have the complete CMSG. */
3599                         *error = EINVAL;
3600                         return (1);
3601                 }
3602                 if (cmh.cmsg_level == IPPROTO_SCTP) {
3603                         switch (cmh.cmsg_type) {
3604                         case SCTP_INIT:
3605                                 if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh))) < sizeof(struct sctp_initmsg)) {
3606                                         *error = EINVAL;
3607                                         return (1);
3608                                 }
3609                                 m_copydata(control, at + CMSG_ALIGN(sizeof(cmh)), sizeof(struct sctp_initmsg), (caddr_t)&initmsg);
3610                                 if (initmsg.sinit_max_attempts)
3611                                         stcb->asoc.max_init_times = initmsg.sinit_max_attempts;
3612                                 if (initmsg.sinit_num_ostreams)
3613                                         stcb->asoc.pre_open_streams = initmsg.sinit_num_ostreams;
3614                                 if (initmsg.sinit_max_instreams)
3615                                         stcb->asoc.max_inbound_streams = initmsg.sinit_max_instreams;
3616                                 if (initmsg.sinit_max_init_timeo)
3617                                         stcb->asoc.initial_init_rto_max = initmsg.sinit_max_init_timeo;
3618                                 if (stcb->asoc.streamoutcnt < stcb->asoc.pre_open_streams) {
3619                                         struct sctp_stream_out *tmp_str;
3620                                         unsigned int i;
3621 #if defined(SCTP_DETAILED_STR_STATS)
3622                                         int j;
3623 #endif
3624
3625                                         /* Default is NOT correct */
3626                                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Ok, default:%d pre_open:%d\n",
3627                                             stcb->asoc.streamoutcnt, stcb->asoc.pre_open_streams);
3628                                         SCTP_TCB_UNLOCK(stcb);
3629                                         SCTP_MALLOC(tmp_str,
3630                                             struct sctp_stream_out *,
3631                                             (stcb->asoc.pre_open_streams * sizeof(struct sctp_stream_out)),
3632                                             SCTP_M_STRMO);
3633                                         SCTP_TCB_LOCK(stcb);
3634                                         if (tmp_str != NULL) {
3635                                                 SCTP_FREE(stcb->asoc.strmout, SCTP_M_STRMO);
3636                                                 stcb->asoc.strmout = tmp_str;
3637                                                 stcb->asoc.strm_realoutsize = stcb->asoc.streamoutcnt = stcb->asoc.pre_open_streams;
3638                                         } else {
3639                                                 stcb->asoc.pre_open_streams = stcb->asoc.streamoutcnt;
3640                                         }
3641                                         for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
3642                                                 TAILQ_INIT(&stcb->asoc.strmout[i].outqueue);
3643                                                 stcb->asoc.strmout[i].chunks_on_queues = 0;
3644                                                 stcb->asoc.strmout[i].next_mid_ordered = 0;
3645                                                 stcb->asoc.strmout[i].next_mid_unordered = 0;
3646 #if defined(SCTP_DETAILED_STR_STATS)
3647                                                 for (j = 0; j < SCTP_PR_SCTP_MAX + 1; j++) {
3648                                                         stcb->asoc.strmout[i].abandoned_sent[j] = 0;
3649                                                         stcb->asoc.strmout[i].abandoned_unsent[j] = 0;
3650                                                 }
3651 #else
3652                                                 stcb->asoc.strmout[i].abandoned_sent[0] = 0;
3653                                                 stcb->asoc.strmout[i].abandoned_unsent[0] = 0;
3654 #endif
3655                                                 stcb->asoc.strmout[i].sid = i;
3656                                                 stcb->asoc.strmout[i].last_msg_incomplete = 0;
3657                                                 stcb->asoc.strmout[i].state = SCTP_STREAM_OPENING;
3658                                                 stcb->asoc.ss_functions.sctp_ss_init_stream(stcb, &stcb->asoc.strmout[i], NULL);
3659                                         }
3660                                 }
3661                                 break;
3662 #ifdef INET
3663                         case SCTP_DSTADDRV4:
3664                                 if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh))) < sizeof(struct in_addr)) {
3665                                         *error = EINVAL;
3666                                         return (1);
3667                                 }
3668                                 memset(&sin, 0, sizeof(struct sockaddr_in));
3669                                 sin.sin_family = AF_INET;
3670                                 sin.sin_len = sizeof(struct sockaddr_in);
3671                                 sin.sin_port = stcb->rport;
3672                                 m_copydata(control, at + CMSG_ALIGN(sizeof(cmh)), sizeof(struct in_addr), (caddr_t)&sin.sin_addr);
3673                                 if ((sin.sin_addr.s_addr == INADDR_ANY) ||
3674                                     (sin.sin_addr.s_addr == INADDR_BROADCAST) ||
3675                                     IN_MULTICAST(ntohl(sin.sin_addr.s_addr))) {
3676                                         *error = EINVAL;
3677                                         return (1);
3678                                 }
3679                                 if (sctp_add_remote_addr(stcb, (struct sockaddr *)&sin, NULL, stcb->asoc.port,
3680                                     SCTP_DONOT_SETSCOPE, SCTP_ADDR_IS_CONFIRMED)) {
3681                                         *error = ENOBUFS;
3682                                         return (1);
3683                                 }
3684                                 break;
3685 #endif
3686 #ifdef INET6
3687                         case SCTP_DSTADDRV6:
3688                                 if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh))) < sizeof(struct in6_addr)) {
3689                                         *error = EINVAL;
3690                                         return (1);
3691                                 }
3692                                 memset(&sin6, 0, sizeof(struct sockaddr_in6));
3693                                 sin6.sin6_family = AF_INET6;
3694                                 sin6.sin6_len = sizeof(struct sockaddr_in6);
3695                                 sin6.sin6_port = stcb->rport;
3696                                 m_copydata(control, at + CMSG_ALIGN(sizeof(cmh)), sizeof(struct in6_addr), (caddr_t)&sin6.sin6_addr);
3697                                 if (IN6_IS_ADDR_UNSPECIFIED(&sin6.sin6_addr) ||
3698                                     IN6_IS_ADDR_MULTICAST(&sin6.sin6_addr)) {
3699                                         *error = EINVAL;
3700                                         return (1);
3701                                 }
3702 #ifdef INET
3703                                 if (IN6_IS_ADDR_V4MAPPED(&sin6.sin6_addr)) {
3704                                         in6_sin6_2_sin(&sin, &sin6);
3705                                         if ((sin.sin_addr.s_addr == INADDR_ANY) ||
3706                                             (sin.sin_addr.s_addr == INADDR_BROADCAST) ||
3707                                             IN_MULTICAST(ntohl(sin.sin_addr.s_addr))) {
3708                                                 *error = EINVAL;
3709                                                 return (1);
3710                                         }
3711                                         if (sctp_add_remote_addr(stcb, (struct sockaddr *)&sin, NULL, stcb->asoc.port,
3712                                             SCTP_DONOT_SETSCOPE, SCTP_ADDR_IS_CONFIRMED)) {
3713                                                 *error = ENOBUFS;
3714                                                 return (1);
3715                                         }
3716                                 } else
3717 #endif
3718                                         if (sctp_add_remote_addr(stcb, (struct sockaddr *)&sin6, NULL, stcb->asoc.port,
3719                                     SCTP_DONOT_SETSCOPE, SCTP_ADDR_IS_CONFIRMED)) {
3720                                         *error = ENOBUFS;
3721                                         return (1);
3722                                 }
3723                                 break;
3724 #endif
3725                         default:
3726                                 break;
3727                         }
3728                 }
3729                 at += CMSG_ALIGN(cmh.cmsg_len);
3730         }
3731         return (0);
3732 }
3733
3734 static struct sctp_tcb *
3735 sctp_findassociation_cmsgs(struct sctp_inpcb **inp_p,
3736     uint16_t port,
3737     struct mbuf *control,
3738     struct sctp_nets **net_p,
3739     int *error)
3740 {
3741         struct cmsghdr cmh;
3742         int tlen, at;
3743         struct sctp_tcb *stcb;
3744         struct sockaddr *addr;
3745 #ifdef INET
3746         struct sockaddr_in sin;
3747 #endif
3748 #ifdef INET6
3749         struct sockaddr_in6 sin6;
3750 #endif
3751
3752         tlen = SCTP_BUF_LEN(control);
3753         at = 0;
3754         while (at < tlen) {
3755                 if ((tlen - at) < (int)CMSG_ALIGN(sizeof(cmh))) {
3756                         /* There is not enough room for one more. */
3757                         *error = EINVAL;
3758                         return (NULL);
3759                 }
3760                 m_copydata(control, at, sizeof(cmh), (caddr_t)&cmh);
3761                 if (cmh.cmsg_len < CMSG_ALIGN(sizeof(cmh))) {
3762                         /* We dont't have a complete CMSG header. */
3763                         *error = EINVAL;
3764                         return (NULL);
3765                 }
3766                 if (((int)cmh.cmsg_len + at) > tlen) {
3767                         /* We don't have the complete CMSG. */
3768                         *error = EINVAL;
3769                         return (NULL);
3770                 }
3771                 if (cmh.cmsg_level == IPPROTO_SCTP) {
3772                         switch (cmh.cmsg_type) {
3773 #ifdef INET
3774                         case SCTP_DSTADDRV4:
3775                                 if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh))) < sizeof(struct in_addr)) {
3776                                         *error = EINVAL;
3777                                         return (NULL);
3778                                 }
3779                                 memset(&sin, 0, sizeof(struct sockaddr_in));
3780                                 sin.sin_family = AF_INET;
3781                                 sin.sin_len = sizeof(struct sockaddr_in);
3782                                 sin.sin_port = port;
3783                                 m_copydata(control, at + CMSG_ALIGN(sizeof(cmh)), sizeof(struct in_addr), (caddr_t)&sin.sin_addr);
3784                                 addr = (struct sockaddr *)&sin;
3785                                 break;
3786 #endif
3787 #ifdef INET6
3788                         case SCTP_DSTADDRV6:
3789                                 if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh))) < sizeof(struct in6_addr)) {
3790                                         *error = EINVAL;
3791                                         return (NULL);
3792                                 }
3793                                 memset(&sin6, 0, sizeof(struct sockaddr_in6));
3794                                 sin6.sin6_family = AF_INET6;
3795                                 sin6.sin6_len = sizeof(struct sockaddr_in6);
3796                                 sin6.sin6_port = port;
3797                                 m_copydata(control, at + CMSG_ALIGN(sizeof(cmh)), sizeof(struct in6_addr), (caddr_t)&sin6.sin6_addr);
3798 #ifdef INET
3799                                 if (IN6_IS_ADDR_V4MAPPED(&sin6.sin6_addr)) {
3800                                         in6_sin6_2_sin(&sin, &sin6);
3801                                         addr = (struct sockaddr *)&sin;
3802                                 } else
3803 #endif
3804                                         addr = (struct sockaddr *)&sin6;
3805                                 break;
3806 #endif
3807                         default:
3808                                 addr = NULL;
3809                                 break;
3810                         }
3811                         if (addr) {
3812                                 stcb = sctp_findassociation_ep_addr(inp_p, addr, net_p, NULL, NULL);
3813                                 if (stcb != NULL) {
3814                                         return (stcb);
3815                                 }
3816                         }
3817                 }
3818                 at += CMSG_ALIGN(cmh.cmsg_len);
3819         }
3820         return (NULL);
3821 }
3822
3823 static struct mbuf *
3824 sctp_add_cookie(struct mbuf *init, int init_offset,
3825     struct mbuf *initack, int initack_offset, struct sctp_state_cookie *stc_in, uint8_t **signature)
3826 {
3827         struct mbuf *copy_init, *copy_initack, *m_at, *sig, *mret;
3828         struct sctp_state_cookie *stc;
3829         struct sctp_paramhdr *ph;
3830         uint8_t *foo;
3831         int sig_offset;
3832         uint16_t cookie_sz;
3833
3834         mret = sctp_get_mbuf_for_msg((sizeof(struct sctp_state_cookie) +
3835             sizeof(struct sctp_paramhdr)), 0,
3836             M_NOWAIT, 1, MT_DATA);
3837         if (mret == NULL) {
3838                 return (NULL);
3839         }
3840         copy_init = SCTP_M_COPYM(init, init_offset, M_COPYALL, M_NOWAIT);
3841         if (copy_init == NULL) {
3842                 sctp_m_freem(mret);
3843                 return (NULL);
3844         }
3845 #ifdef SCTP_MBUF_LOGGING
3846         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
3847                 sctp_log_mbc(copy_init, SCTP_MBUF_ICOPY);
3848         }
3849 #endif
3850         copy_initack = SCTP_M_COPYM(initack, initack_offset, M_COPYALL,
3851             M_NOWAIT);
3852         if (copy_initack == NULL) {
3853                 sctp_m_freem(mret);
3854                 sctp_m_freem(copy_init);
3855                 return (NULL);
3856         }
3857 #ifdef SCTP_MBUF_LOGGING
3858         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
3859                 sctp_log_mbc(copy_initack, SCTP_MBUF_ICOPY);
3860         }
3861 #endif
3862         /* easy side we just drop it on the end */
3863         ph = mtod(mret, struct sctp_paramhdr *);
3864         SCTP_BUF_LEN(mret) = sizeof(struct sctp_state_cookie) +
3865             sizeof(struct sctp_paramhdr);
3866         stc = (struct sctp_state_cookie *)((caddr_t)ph +
3867             sizeof(struct sctp_paramhdr));
3868         ph->param_type = htons(SCTP_STATE_COOKIE);
3869         ph->param_length = 0;   /* fill in at the end */
3870         /* Fill in the stc cookie data */
3871         memcpy(stc, stc_in, sizeof(struct sctp_state_cookie));
3872
3873         /* tack the INIT and then the INIT-ACK onto the chain */
3874         cookie_sz = 0;
3875         for (m_at = mret; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
3876                 cookie_sz += SCTP_BUF_LEN(m_at);
3877                 if (SCTP_BUF_NEXT(m_at) == NULL) {
3878                         SCTP_BUF_NEXT(m_at) = copy_init;
3879                         break;
3880                 }
3881         }
3882         for (m_at = copy_init; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
3883                 cookie_sz += SCTP_BUF_LEN(m_at);
3884                 if (SCTP_BUF_NEXT(m_at) == NULL) {
3885                         SCTP_BUF_NEXT(m_at) = copy_initack;
3886                         break;
3887                 }
3888         }
3889         for (m_at = copy_initack; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
3890                 cookie_sz += SCTP_BUF_LEN(m_at);
3891                 if (SCTP_BUF_NEXT(m_at) == NULL) {
3892                         break;
3893                 }
3894         }
3895         sig = sctp_get_mbuf_for_msg(SCTP_SECRET_SIZE, 0, M_NOWAIT, 1, MT_DATA);
3896         if (sig == NULL) {
3897                 /* no space, so free the entire chain */
3898                 sctp_m_freem(mret);
3899                 return (NULL);
3900         }
3901         SCTP_BUF_LEN(sig) = 0;
3902         SCTP_BUF_NEXT(m_at) = sig;
3903         sig_offset = 0;
3904         foo = (uint8_t *)(mtod(sig, caddr_t)+sig_offset);
3905         memset(foo, 0, SCTP_SIGNATURE_SIZE);
3906         *signature = foo;
3907         SCTP_BUF_LEN(sig) += SCTP_SIGNATURE_SIZE;
3908         cookie_sz += SCTP_SIGNATURE_SIZE;
3909         ph->param_length = htons(cookie_sz);
3910         return (mret);
3911 }
3912
3913
3914 static uint8_t
3915 sctp_get_ect(struct sctp_tcb *stcb)
3916 {
3917         if ((stcb != NULL) && (stcb->asoc.ecn_supported == 1)) {
3918                 return (SCTP_ECT0_BIT);
3919         } else {
3920                 return (0);
3921         }
3922 }
3923
3924 #if defined(INET) || defined(INET6)
3925 static void
3926 sctp_handle_no_route(struct sctp_tcb *stcb,
3927     struct sctp_nets *net,
3928     int so_locked)
3929 {
3930         SCTPDBG(SCTP_DEBUG_OUTPUT1, "dropped packet - no valid source addr\n");
3931
3932         if (net) {
3933                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Destination was ");
3934                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT1, &net->ro._l_addr.sa);
3935                 if (net->dest_state & SCTP_ADDR_CONFIRMED) {
3936                         if ((net->dest_state & SCTP_ADDR_REACHABLE) && stcb) {
3937                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "no route takes interface %p down\n", (void *)net);
3938                                 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_DOWN,
3939                                     stcb, 0,
3940                                     (void *)net,
3941                                     so_locked);
3942                                 net->dest_state &= ~SCTP_ADDR_REACHABLE;
3943                                 net->dest_state &= ~SCTP_ADDR_PF;
3944                         }
3945                 }
3946                 if (stcb) {
3947                         if (net == stcb->asoc.primary_destination) {
3948                                 /* need a new primary */
3949                                 struct sctp_nets *alt;
3950
3951                                 alt = sctp_find_alternate_net(stcb, net, 0);
3952                                 if (alt != net) {
3953                                         if (stcb->asoc.alternate) {
3954                                                 sctp_free_remote_addr(stcb->asoc.alternate);
3955                                         }
3956                                         stcb->asoc.alternate = alt;
3957                                         atomic_add_int(&stcb->asoc.alternate->ref_count, 1);
3958                                         if (net->ro._s_addr) {
3959                                                 sctp_free_ifa(net->ro._s_addr);
3960                                                 net->ro._s_addr = NULL;
3961                                         }
3962                                         net->src_addr_selected = 0;
3963                                 }
3964                         }
3965                 }
3966         }
3967 }
3968 #endif
3969
3970 static int
3971 sctp_lowlevel_chunk_output(struct sctp_inpcb *inp,
3972     struct sctp_tcb *stcb,      /* may be NULL */
3973     struct sctp_nets *net,
3974     struct sockaddr *to,
3975     struct mbuf *m,
3976     uint32_t auth_offset,
3977     struct sctp_auth_chunk *auth,
3978     uint16_t auth_keyid,
3979     int nofragment_flag,
3980     int ecn_ok,
3981     int out_of_asoc_ok,
3982     uint16_t src_port,
3983     uint16_t dest_port,
3984     uint32_t v_tag,
3985     uint16_t port,
3986     union sctp_sockstore *over_addr,
3987     uint8_t mflowtype, uint32_t mflowid,
3988 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
3989     int so_locked SCTP_UNUSED
3990 #else
3991     int so_locked
3992 #endif
3993 )
3994 {
3995 /* nofragment_flag to tell if IP_DF should be set (IPv4 only) */
3996         /**
3997          * Given a mbuf chain (via SCTP_BUF_NEXT()) that holds a packet header
3998          * WITH an SCTPHDR but no IP header, endpoint inp and sa structure:
3999          * - fill in the HMAC digest of any AUTH chunk in the packet.
4000          * - calculate and fill in the SCTP checksum.
4001          * - prepend an IP address header.
4002          * - if boundall use INADDR_ANY.
4003          * - if boundspecific do source address selection.
4004          * - set fragmentation option for ipV4.
4005          * - On return from IP output, check/adjust mtu size of output
4006          *   interface and smallest_mtu size as well.
4007          */
4008         /* Will need ifdefs around this */
4009         struct mbuf *newm;
4010         struct sctphdr *sctphdr;
4011         int packet_length;
4012         int ret;
4013 #if defined(INET) || defined(INET6)
4014         uint32_t vrf_id;
4015 #endif
4016 #if defined(INET) || defined(INET6)
4017         struct mbuf *o_pak;
4018         sctp_route_t *ro = NULL;
4019         struct udphdr *udp = NULL;
4020 #endif
4021         uint8_t tos_value;
4022 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4023         struct socket *so = NULL;
4024 #endif
4025
4026         if ((net) && (net->dest_state & SCTP_ADDR_OUT_OF_SCOPE)) {
4027                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EFAULT);
4028                 sctp_m_freem(m);
4029                 return (EFAULT);
4030         }
4031 #if defined(INET) || defined(INET6)
4032         if (stcb) {
4033                 vrf_id = stcb->asoc.vrf_id;
4034         } else {
4035                 vrf_id = inp->def_vrf_id;
4036         }
4037 #endif
4038         /* fill in the HMAC digest for any AUTH chunk in the packet */
4039         if ((auth != NULL) && (stcb != NULL)) {
4040                 sctp_fill_hmac_digest_m(m, auth_offset, auth, stcb, auth_keyid);
4041         }
4042
4043         if (net) {
4044                 tos_value = net->dscp;
4045         } else if (stcb) {
4046                 tos_value = stcb->asoc.default_dscp;
4047         } else {
4048                 tos_value = inp->sctp_ep.default_dscp;
4049         }
4050
4051         switch (to->sa_family) {
4052 #ifdef INET
4053         case AF_INET:
4054                 {
4055                         struct ip *ip = NULL;
4056                         sctp_route_t iproute;
4057                         int len;
4058
4059                         len = SCTP_MIN_V4_OVERHEAD;
4060                         if (port) {
4061                                 len += sizeof(struct udphdr);
4062                         }
4063                         newm = sctp_get_mbuf_for_msg(len, 1, M_NOWAIT, 1, MT_DATA);
4064                         if (newm == NULL) {
4065                                 sctp_m_freem(m);
4066                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
4067                                 return (ENOMEM);
4068                         }
4069                         SCTP_ALIGN_TO_END(newm, len);
4070                         SCTP_BUF_LEN(newm) = len;
4071                         SCTP_BUF_NEXT(newm) = m;
4072                         m = newm;
4073                         if (net != NULL) {
4074                                 m->m_pkthdr.flowid = net->flowid;
4075                                 M_HASHTYPE_SET(m, net->flowtype);
4076                         } else {
4077                                 m->m_pkthdr.flowid = mflowid;
4078                                 M_HASHTYPE_SET(m, mflowtype);
4079                         }
4080                         packet_length = sctp_calculate_len(m);
4081                         ip = mtod(m, struct ip *);
4082                         ip->ip_v = IPVERSION;
4083                         ip->ip_hl = (sizeof(struct ip) >> 2);
4084                         if (tos_value == 0) {
4085                                 /*
4086                                  * This means especially, that it is not set
4087                                  * at the SCTP layer. So use the value from
4088                                  * the IP layer.
4089                                  */
4090                                 tos_value = inp->ip_inp.inp.inp_ip_tos;
4091                         }
4092                         tos_value &= 0xfc;
4093                         if (ecn_ok) {
4094                                 tos_value |= sctp_get_ect(stcb);
4095                         }
4096                         if ((nofragment_flag) && (port == 0)) {
4097                                 ip->ip_off = htons(IP_DF);
4098                         } else {
4099                                 ip->ip_off = htons(0);
4100                         }
4101                         /* FreeBSD has a function for ip_id's */
4102                         ip_fillid(ip);
4103
4104                         ip->ip_ttl = inp->ip_inp.inp.inp_ip_ttl;
4105                         ip->ip_len = htons(packet_length);
4106                         ip->ip_tos = tos_value;
4107                         if (port) {
4108                                 ip->ip_p = IPPROTO_UDP;
4109                         } else {
4110                                 ip->ip_p = IPPROTO_SCTP;
4111                         }
4112                         ip->ip_sum = 0;
4113                         if (net == NULL) {
4114                                 ro = &iproute;
4115                                 memset(&iproute, 0, sizeof(iproute));
4116                                 memcpy(&ro->ro_dst, to, to->sa_len);
4117                         } else {
4118                                 ro = (sctp_route_t *)&net->ro;
4119                         }
4120                         /* Now the address selection part */
4121                         ip->ip_dst.s_addr = ((struct sockaddr_in *)to)->sin_addr.s_addr;
4122
4123                         /* call the routine to select the src address */
4124                         if (net && out_of_asoc_ok == 0) {
4125                                 if (net->ro._s_addr && (net->ro._s_addr->localifa_flags & (SCTP_BEING_DELETED | SCTP_ADDR_IFA_UNUSEABLE))) {
4126                                         sctp_free_ifa(net->ro._s_addr);
4127                                         net->ro._s_addr = NULL;
4128                                         net->src_addr_selected = 0;
4129                                         if (ro->ro_rt) {
4130                                                 RTFREE(ro->ro_rt);
4131                                                 ro->ro_rt = NULL;
4132                                         }
4133                                 }
4134                                 if (net->src_addr_selected == 0) {
4135                                         /* Cache the source address */
4136                                         net->ro._s_addr = sctp_source_address_selection(inp, stcb,
4137                                             ro, net, 0,
4138                                             vrf_id);
4139                                         net->src_addr_selected = 1;
4140                                 }
4141                                 if (net->ro._s_addr == NULL) {
4142                                         /* No route to host */
4143                                         net->src_addr_selected = 0;
4144                                         sctp_handle_no_route(stcb, net, so_locked);
4145                                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4146                                         sctp_m_freem(m);
4147                                         return (EHOSTUNREACH);
4148                                 }
4149                                 ip->ip_src = net->ro._s_addr->address.sin.sin_addr;
4150                         } else {
4151                                 if (over_addr == NULL) {
4152                                         struct sctp_ifa *_lsrc;
4153
4154                                         _lsrc = sctp_source_address_selection(inp, stcb, ro,
4155                                             net,
4156                                             out_of_asoc_ok,
4157                                             vrf_id);
4158                                         if (_lsrc == NULL) {
4159                                                 sctp_handle_no_route(stcb, net, so_locked);
4160                                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4161                                                 sctp_m_freem(m);
4162                                                 return (EHOSTUNREACH);
4163                                         }
4164                                         ip->ip_src = _lsrc->address.sin.sin_addr;
4165                                         sctp_free_ifa(_lsrc);
4166                                 } else {
4167                                         ip->ip_src = over_addr->sin.sin_addr;
4168                                         SCTP_RTALLOC(ro, vrf_id, inp->fibnum);
4169                                 }
4170                         }
4171                         if (port) {
4172                                 if (htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port)) == 0) {
4173                                         sctp_handle_no_route(stcb, net, so_locked);
4174                                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4175                                         sctp_m_freem(m);
4176                                         return (EHOSTUNREACH);
4177                                 }
4178                                 udp = (struct udphdr *)((caddr_t)ip + sizeof(struct ip));
4179                                 udp->uh_sport = htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port));
4180                                 udp->uh_dport = port;
4181                                 udp->uh_ulen = htons((uint16_t)(packet_length - sizeof(struct ip)));
4182                                 if (V_udp_cksum) {
4183                                         udp->uh_sum = in_pseudo(ip->ip_src.s_addr, ip->ip_dst.s_addr, udp->uh_ulen + htons(IPPROTO_UDP));
4184                                 } else {
4185                                         udp->uh_sum = 0;
4186                                 }
4187                                 sctphdr = (struct sctphdr *)((caddr_t)udp + sizeof(struct udphdr));
4188                         } else {
4189                                 sctphdr = (struct sctphdr *)((caddr_t)ip + sizeof(struct ip));
4190                         }
4191
4192                         sctphdr->src_port = src_port;
4193                         sctphdr->dest_port = dest_port;
4194                         sctphdr->v_tag = v_tag;
4195                         sctphdr->checksum = 0;
4196
4197                         /*
4198                          * If source address selection fails and we find no
4199                          * route then the ip_output should fail as well with
4200                          * a NO_ROUTE_TO_HOST type error. We probably should
4201                          * catch that somewhere and abort the association
4202                          * right away (assuming this is an INIT being sent).
4203                          */
4204                         if (ro->ro_rt == NULL) {
4205                                 /*
4206                                  * src addr selection failed to find a route
4207                                  * (or valid source addr), so we can't get
4208                                  * there from here (yet)!
4209                                  */
4210                                 sctp_handle_no_route(stcb, net, so_locked);
4211                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4212                                 sctp_m_freem(m);
4213                                 return (EHOSTUNREACH);
4214                         }
4215                         if (ro != &iproute) {
4216                                 memcpy(&iproute, ro, sizeof(*ro));
4217                         }
4218                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "Calling ipv4 output routine from low level src addr:%x\n",
4219                             (uint32_t)(ntohl(ip->ip_src.s_addr)));
4220                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "Destination is %x\n",
4221                             (uint32_t)(ntohl(ip->ip_dst.s_addr)));
4222                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "RTP route is %p through\n",
4223                             (void *)ro->ro_rt);
4224
4225                         if (SCTP_GET_HEADER_FOR_OUTPUT(o_pak)) {
4226                                 /* failed to prepend data, give up */
4227                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
4228                                 sctp_m_freem(m);
4229                                 return (ENOMEM);
4230                         }
4231                         SCTP_ATTACH_CHAIN(o_pak, m, packet_length);
4232                         if (port) {
4233                                 sctphdr->checksum = sctp_calculate_cksum(m, sizeof(struct ip) + sizeof(struct udphdr));
4234                                 SCTP_STAT_INCR(sctps_sendswcrc);
4235                                 if (V_udp_cksum) {
4236                                         SCTP_ENABLE_UDP_CSUM(o_pak);
4237                                 }
4238                         } else {
4239                                 m->m_pkthdr.csum_flags = CSUM_SCTP;
4240                                 m->m_pkthdr.csum_data = offsetof(struct sctphdr, checksum);
4241                                 SCTP_STAT_INCR(sctps_sendhwcrc);
4242                         }
4243 #ifdef SCTP_PACKET_LOGGING
4244                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING)
4245                                 sctp_packet_log(o_pak);
4246 #endif
4247                         /* send it out.  table id is taken from stcb */
4248 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4249                         if ((SCTP_BASE_SYSCTL(sctp_output_unlocked)) && (so_locked)) {
4250                                 so = SCTP_INP_SO(inp);
4251                                 SCTP_SOCKET_UNLOCK(so, 0);
4252                         }
4253 #endif
4254                         SCTP_IP_OUTPUT(ret, o_pak, ro, stcb, vrf_id);
4255 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4256                         if ((SCTP_BASE_SYSCTL(sctp_output_unlocked)) && (so_locked)) {
4257                                 atomic_add_int(&stcb->asoc.refcnt, 1);
4258                                 SCTP_TCB_UNLOCK(stcb);
4259                                 SCTP_SOCKET_LOCK(so, 0);
4260                                 SCTP_TCB_LOCK(stcb);
4261                                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
4262                         }
4263 #endif
4264                         SCTP_STAT_INCR(sctps_sendpackets);
4265                         SCTP_STAT_INCR_COUNTER64(sctps_outpackets);
4266                         if (ret)
4267                                 SCTP_STAT_INCR(sctps_senderrors);
4268
4269                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "IP output returns %d\n", ret);
4270                         if (net == NULL) {
4271                                 /* free tempy routes */
4272                                 RO_RTFREE(ro);
4273                         } else {
4274                                 if ((ro->ro_rt != NULL) && (net->ro._s_addr) &&
4275                                     ((net->dest_state & SCTP_ADDR_NO_PMTUD) == 0)) {
4276                                         uint32_t mtu;
4277
4278                                         mtu = SCTP_GATHER_MTU_FROM_ROUTE(net->ro._s_addr, &net->ro._l_addr.sa, ro->ro_rt);
4279                                         if (mtu > 0) {
4280                                                 if (net->port) {
4281                                                         mtu -= sizeof(struct udphdr);
4282                                                 }
4283                                                 if ((stcb != NULL) && (stcb->asoc.smallest_mtu > mtu)) {
4284                                                         sctp_mtu_size_reset(inp, &stcb->asoc, mtu);
4285                                                 }
4286                                                 net->mtu = mtu;
4287                                         }
4288                                 } else if (ro->ro_rt == NULL) {
4289                                         /* route was freed */
4290                                         if (net->ro._s_addr &&
4291                                             net->src_addr_selected) {
4292                                                 sctp_free_ifa(net->ro._s_addr);
4293                                                 net->ro._s_addr = NULL;
4294                                         }
4295                                         net->src_addr_selected = 0;
4296                                 }
4297                         }
4298                         return (ret);
4299                 }
4300 #endif
4301 #ifdef INET6
4302         case AF_INET6:
4303                 {
4304                         uint32_t flowlabel, flowinfo;
4305                         struct ip6_hdr *ip6h;
4306                         struct route_in6 ip6route;
4307                         struct ifnet *ifp;
4308                         struct sockaddr_in6 *sin6, tmp, *lsa6, lsa6_tmp;
4309                         int prev_scope = 0;
4310                         struct sockaddr_in6 lsa6_storage;
4311                         int error;
4312                         u_short prev_port = 0;
4313                         int len;
4314
4315                         if (net) {
4316                                 flowlabel = net->flowlabel;
4317                         } else if (stcb) {
4318                                 flowlabel = stcb->asoc.default_flowlabel;
4319                         } else {
4320                                 flowlabel = inp->sctp_ep.default_flowlabel;
4321                         }
4322                         if (flowlabel == 0) {
4323                                 /*
4324                                  * This means especially, that it is not set
4325                                  * at the SCTP layer. So use the value from
4326                                  * the IP layer.
4327                                  */
4328                                 flowlabel = ntohl(((struct in6pcb *)inp)->in6p_flowinfo);
4329                         }
4330                         flowlabel &= 0x000fffff;
4331                         len = SCTP_MIN_OVERHEAD;
4332                         if (port) {
4333                                 len += sizeof(struct udphdr);
4334                         }
4335                         newm = sctp_get_mbuf_for_msg(len, 1, M_NOWAIT, 1, MT_DATA);
4336                         if (newm == NULL) {
4337                                 sctp_m_freem(m);
4338                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
4339                                 return (ENOMEM);
4340                         }
4341                         SCTP_ALIGN_TO_END(newm, len);
4342                         SCTP_BUF_LEN(newm) = len;
4343                         SCTP_BUF_NEXT(newm) = m;
4344                         m = newm;
4345                         if (net != NULL) {
4346                                 m->m_pkthdr.flowid = net->flowid;
4347                                 M_HASHTYPE_SET(m, net->flowtype);
4348                         } else {
4349                                 m->m_pkthdr.flowid = mflowid;
4350                                 M_HASHTYPE_SET(m, mflowtype);
4351                         }
4352                         packet_length = sctp_calculate_len(m);
4353
4354                         ip6h = mtod(m, struct ip6_hdr *);
4355                         /* protect *sin6 from overwrite */
4356                         sin6 = (struct sockaddr_in6 *)to;
4357                         tmp = *sin6;
4358                         sin6 = &tmp;
4359
4360                         /* KAME hack: embed scopeid */
4361                         if (sa6_embedscope(sin6, MODULE_GLOBAL(ip6_use_defzone)) != 0) {
4362                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
4363                                 return (EINVAL);
4364                         }
4365                         if (net == NULL) {
4366                                 memset(&ip6route, 0, sizeof(ip6route));
4367                                 ro = (sctp_route_t *)&ip6route;
4368                                 memcpy(&ro->ro_dst, sin6, sin6->sin6_len);
4369                         } else {
4370                                 ro = (sctp_route_t *)&net->ro;
4371                         }
4372                         /*
4373                          * We assume here that inp_flow is in host byte
4374                          * order within the TCB!
4375                          */
4376                         if (tos_value == 0) {
4377                                 /*
4378                                  * This means especially, that it is not set
4379                                  * at the SCTP layer. So use the value from
4380                                  * the IP layer.
4381                                  */
4382                                 tos_value = (ntohl(((struct in6pcb *)inp)->in6p_flowinfo) >> 20) & 0xff;
4383                         }
4384                         tos_value &= 0xfc;
4385                         if (ecn_ok) {
4386                                 tos_value |= sctp_get_ect(stcb);
4387                         }
4388                         flowinfo = 0x06;
4389                         flowinfo <<= 8;
4390                         flowinfo |= tos_value;
4391                         flowinfo <<= 20;
4392                         flowinfo |= flowlabel;
4393                         ip6h->ip6_flow = htonl(flowinfo);
4394                         if (port) {
4395                                 ip6h->ip6_nxt = IPPROTO_UDP;
4396                         } else {
4397                                 ip6h->ip6_nxt = IPPROTO_SCTP;
4398                         }
4399                         ip6h->ip6_plen = htons((uint16_t)(packet_length - sizeof(struct ip6_hdr)));
4400                         ip6h->ip6_dst = sin6->sin6_addr;
4401
4402                         /*
4403                          * Add SRC address selection here: we can only reuse
4404                          * to a limited degree the kame src-addr-sel, since
4405                          * we can try their selection but it may not be
4406                          * bound.
4407                          */
4408                         memset(&lsa6_tmp, 0, sizeof(lsa6_tmp));
4409                         lsa6_tmp.sin6_family = AF_INET6;
4410                         lsa6_tmp.sin6_len = sizeof(lsa6_tmp);
4411                         lsa6 = &lsa6_tmp;
4412                         if (net && out_of_asoc_ok == 0) {
4413                                 if (net->ro._s_addr && (net->ro._s_addr->localifa_flags & (SCTP_BEING_DELETED | SCTP_ADDR_IFA_UNUSEABLE))) {
4414                                         sctp_free_ifa(net->ro._s_addr);
4415                                         net->ro._s_addr = NULL;
4416                                         net->src_addr_selected = 0;
4417                                         if (ro->ro_rt) {
4418                                                 RTFREE(ro->ro_rt);
4419                                                 ro->ro_rt = NULL;
4420                                         }
4421                                 }
4422                                 if (net->src_addr_selected == 0) {
4423                                         sin6 = (struct sockaddr_in6 *)&net->ro._l_addr;
4424                                         /* KAME hack: embed scopeid */
4425                                         if (sa6_embedscope(sin6, MODULE_GLOBAL(ip6_use_defzone)) != 0) {
4426                                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
4427                                                 return (EINVAL);
4428                                         }
4429                                         /* Cache the source address */
4430                                         net->ro._s_addr = sctp_source_address_selection(inp,
4431                                             stcb,
4432                                             ro,
4433                                             net,
4434                                             0,
4435                                             vrf_id);
4436                                         (void)sa6_recoverscope(sin6);
4437                                         net->src_addr_selected = 1;
4438                                 }
4439                                 if (net->ro._s_addr == NULL) {
4440                                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "V6:No route to host\n");
4441                                         net->src_addr_selected = 0;
4442                                         sctp_handle_no_route(stcb, net, so_locked);
4443                                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4444                                         sctp_m_freem(m);
4445                                         return (EHOSTUNREACH);
4446                                 }
4447                                 lsa6->sin6_addr = net->ro._s_addr->address.sin6.sin6_addr;
4448                         } else {
4449                                 sin6 = (struct sockaddr_in6 *)&ro->ro_dst;
4450                                 /* KAME hack: embed scopeid */
4451                                 if (sa6_embedscope(sin6, MODULE_GLOBAL(ip6_use_defzone)) != 0) {
4452                                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
4453                                         return (EINVAL);
4454                                 }
4455                                 if (over_addr == NULL) {
4456                                         struct sctp_ifa *_lsrc;
4457
4458                                         _lsrc = sctp_source_address_selection(inp, stcb, ro,
4459                                             net,
4460                                             out_of_asoc_ok,
4461                                             vrf_id);
4462                                         if (_lsrc == NULL) {
4463                                                 sctp_handle_no_route(stcb, net, so_locked);
4464                                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4465                                                 sctp_m_freem(m);
4466                                                 return (EHOSTUNREACH);
4467                                         }
4468                                         lsa6->sin6_addr = _lsrc->address.sin6.sin6_addr;
4469                                         sctp_free_ifa(_lsrc);
4470                                 } else {
4471                                         lsa6->sin6_addr = over_addr->sin6.sin6_addr;
4472                                         SCTP_RTALLOC(ro, vrf_id, inp->fibnum);
4473                                 }
4474                                 (void)sa6_recoverscope(sin6);
4475                         }
4476                         lsa6->sin6_port = inp->sctp_lport;
4477
4478                         if (ro->ro_rt == NULL) {
4479                                 /*
4480                                  * src addr selection failed to find a route
4481                                  * (or valid source addr), so we can't get
4482                                  * there from here!
4483                                  */
4484                                 sctp_handle_no_route(stcb, net, so_locked);
4485                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4486                                 sctp_m_freem(m);
4487                                 return (EHOSTUNREACH);
4488                         }
4489                         /*
4490                          * XXX: sa6 may not have a valid sin6_scope_id in
4491                          * the non-SCOPEDROUTING case.
4492                          */
4493                         memset(&lsa6_storage, 0, sizeof(lsa6_storage));
4494                         lsa6_storage.sin6_family = AF_INET6;
4495                         lsa6_storage.sin6_len = sizeof(lsa6_storage);
4496                         lsa6_storage.sin6_addr = lsa6->sin6_addr;
4497                         if ((error = sa6_recoverscope(&lsa6_storage)) != 0) {
4498                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "recover scope fails error %d\n", error);
4499                                 sctp_m_freem(m);
4500                                 return (error);
4501                         }
4502                         /* XXX */
4503                         lsa6_storage.sin6_addr = lsa6->sin6_addr;
4504                         lsa6_storage.sin6_port = inp->sctp_lport;
4505                         lsa6 = &lsa6_storage;
4506                         ip6h->ip6_src = lsa6->sin6_addr;
4507
4508                         if (port) {
4509                                 if (htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port)) == 0) {
4510                                         sctp_handle_no_route(stcb, net, so_locked);
4511                                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4512                                         sctp_m_freem(m);
4513                                         return (EHOSTUNREACH);
4514                                 }
4515                                 udp = (struct udphdr *)((caddr_t)ip6h + sizeof(struct ip6_hdr));
4516                                 udp->uh_sport = htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port));
4517                                 udp->uh_dport = port;
4518                                 udp->uh_ulen = htons((uint16_t)(packet_length - sizeof(struct ip6_hdr)));
4519                                 udp->uh_sum = 0;
4520                                 sctphdr = (struct sctphdr *)((caddr_t)udp + sizeof(struct udphdr));
4521                         } else {
4522                                 sctphdr = (struct sctphdr *)((caddr_t)ip6h + sizeof(struct ip6_hdr));
4523                         }
4524
4525                         sctphdr->src_port = src_port;
4526                         sctphdr->dest_port = dest_port;
4527                         sctphdr->v_tag = v_tag;
4528                         sctphdr->checksum = 0;
4529
4530                         /*
4531                          * We set the hop limit now since there is a good
4532                          * chance that our ro pointer is now filled
4533                          */
4534                         ip6h->ip6_hlim = SCTP_GET_HLIM(inp, ro);
4535                         ifp = SCTP_GET_IFN_VOID_FROM_ROUTE(ro);
4536
4537 #ifdef SCTP_DEBUG
4538                         /* Copy to be sure something bad is not happening */
4539                         sin6->sin6_addr = ip6h->ip6_dst;
4540                         lsa6->sin6_addr = ip6h->ip6_src;
4541 #endif
4542
4543                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "Calling ipv6 output routine from low level\n");
4544                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "src: ");
4545                         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT3, (struct sockaddr *)lsa6);
4546                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "dst: ");
4547                         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT3, (struct sockaddr *)sin6);
4548                         if (net) {
4549                                 sin6 = (struct sockaddr_in6 *)&net->ro._l_addr;
4550                                 /*
4551                                  * preserve the port and scope for link
4552                                  * local send
4553                                  */
4554                                 prev_scope = sin6->sin6_scope_id;
4555                                 prev_port = sin6->sin6_port;
4556                         }
4557
4558                         if (SCTP_GET_HEADER_FOR_OUTPUT(o_pak)) {
4559                                 /* failed to prepend data, give up */
4560                                 sctp_m_freem(m);
4561                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
4562                                 return (ENOMEM);
4563                         }
4564                         SCTP_ATTACH_CHAIN(o_pak, m, packet_length);
4565                         if (port) {
4566                                 sctphdr->checksum = sctp_calculate_cksum(m, sizeof(struct ip6_hdr) + sizeof(struct udphdr));
4567                                 SCTP_STAT_INCR(sctps_sendswcrc);
4568                                 if ((udp->uh_sum = in6_cksum(o_pak, IPPROTO_UDP, sizeof(struct ip6_hdr), packet_length - sizeof(struct ip6_hdr))) == 0) {
4569                                         udp->uh_sum = 0xffff;
4570                                 }
4571                         } else {
4572                                 m->m_pkthdr.csum_flags = CSUM_SCTP_IPV6;
4573                                 m->m_pkthdr.csum_data = offsetof(struct sctphdr, checksum);
4574                                 SCTP_STAT_INCR(sctps_sendhwcrc);
4575                         }
4576                         /* send it out. table id is taken from stcb */
4577 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4578                         if ((SCTP_BASE_SYSCTL(sctp_output_unlocked)) && (so_locked)) {
4579                                 so = SCTP_INP_SO(inp);
4580                                 SCTP_SOCKET_UNLOCK(so, 0);
4581                         }
4582 #endif
4583 #ifdef SCTP_PACKET_LOGGING
4584                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING)
4585                                 sctp_packet_log(o_pak);
4586 #endif
4587                         SCTP_IP6_OUTPUT(ret, o_pak, (struct route_in6 *)ro, &ifp, stcb, vrf_id);
4588 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4589                         if ((SCTP_BASE_SYSCTL(sctp_output_unlocked)) && (so_locked)) {
4590                                 atomic_add_int(&stcb->asoc.refcnt, 1);
4591                                 SCTP_TCB_UNLOCK(stcb);
4592                                 SCTP_SOCKET_LOCK(so, 0);
4593                                 SCTP_TCB_LOCK(stcb);
4594                                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
4595                         }
4596 #endif
4597                         if (net) {
4598                                 /* for link local this must be done */
4599                                 sin6->sin6_scope_id = prev_scope;
4600                                 sin6->sin6_port = prev_port;
4601                         }
4602                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "return from send is %d\n", ret);
4603                         SCTP_STAT_INCR(sctps_sendpackets);
4604                         SCTP_STAT_INCR_COUNTER64(sctps_outpackets);
4605                         if (ret) {
4606                                 SCTP_STAT_INCR(sctps_senderrors);
4607                         }
4608                         if (net == NULL) {
4609                                 /* Now if we had a temp route free it */
4610                                 RO_RTFREE(ro);
4611                         } else {
4612                                 /*
4613                                  * PMTU check versus smallest asoc MTU goes
4614                                  * here
4615                                  */
4616                                 if (ro->ro_rt == NULL) {
4617                                         /* Route was freed */
4618                                         if (net->ro._s_addr &&
4619                                             net->src_addr_selected) {
4620                                                 sctp_free_ifa(net->ro._s_addr);
4621                                                 net->ro._s_addr = NULL;
4622                                         }
4623                                         net->src_addr_selected = 0;
4624                                 }
4625                                 if ((ro->ro_rt != NULL) && (net->ro._s_addr) &&
4626                                     ((net->dest_state & SCTP_ADDR_NO_PMTUD) == 0)) {
4627                                         uint32_t mtu;
4628
4629                                         mtu = SCTP_GATHER_MTU_FROM_ROUTE(net->ro._s_addr, &net->ro._l_addr.sa, ro->ro_rt);
4630                                         if (mtu > 0) {
4631                                                 if (net->port) {
4632                                                         mtu -= sizeof(struct udphdr);
4633                                                 }
4634                                                 if ((stcb != NULL) && (stcb->asoc.smallest_mtu > mtu)) {
4635                                                         sctp_mtu_size_reset(inp, &stcb->asoc, mtu);
4636                                                 }
4637                                                 net->mtu = mtu;
4638                                         }
4639                                 } else if (ifp) {
4640                                         if (ND_IFINFO(ifp)->linkmtu &&
4641                                             (stcb->asoc.smallest_mtu > ND_IFINFO(ifp)->linkmtu)) {
4642                                                 sctp_mtu_size_reset(inp,
4643                                                     &stcb->asoc,
4644                                                     ND_IFINFO(ifp)->linkmtu);
4645                                         }
4646                                 }
4647                         }
4648                         return (ret);
4649                 }
4650 #endif
4651         default:
4652                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Unknown protocol (TSNH) type %d\n",
4653                     ((struct sockaddr *)to)->sa_family);
4654                 sctp_m_freem(m);
4655                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EFAULT);
4656                 return (EFAULT);
4657         }
4658 }
4659
4660
4661 void
4662 sctp_send_initiate(struct sctp_inpcb *inp, struct sctp_tcb *stcb, int so_locked
4663 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
4664     SCTP_UNUSED
4665 #endif
4666 )
4667 {
4668         struct mbuf *m, *m_last;
4669         struct sctp_nets *net;
4670         struct sctp_init_chunk *init;
4671         struct sctp_supported_addr_param *sup_addr;
4672         struct sctp_adaptation_layer_indication *ali;
4673         struct sctp_supported_chunk_types_param *pr_supported;
4674         struct sctp_paramhdr *ph;
4675         int cnt_inits_to = 0;
4676         int error;
4677         uint16_t num_ext, chunk_len, padding_len, parameter_len;
4678
4679         /* INIT's always go to the primary (and usually ONLY address) */
4680         net = stcb->asoc.primary_destination;
4681         if (net == NULL) {
4682                 net = TAILQ_FIRST(&stcb->asoc.nets);
4683                 if (net == NULL) {
4684                         /* TSNH */
4685                         return;
4686                 }
4687                 /* we confirm any address we send an INIT to */
4688                 net->dest_state &= ~SCTP_ADDR_UNCONFIRMED;
4689                 (void)sctp_set_primary_addr(stcb, NULL, net);
4690         } else {
4691                 /* we confirm any address we send an INIT to */
4692                 net->dest_state &= ~SCTP_ADDR_UNCONFIRMED;
4693         }
4694         SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT\n");
4695 #ifdef INET6
4696         if (net->ro._l_addr.sa.sa_family == AF_INET6) {
4697                 /*
4698                  * special hook, if we are sending to link local it will not
4699                  * show up in our private address count.
4700                  */
4701                 if (IN6_IS_ADDR_LINKLOCAL(&net->ro._l_addr.sin6.sin6_addr))
4702                         cnt_inits_to = 1;
4703         }
4704 #endif
4705         if (SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
4706                 /* This case should not happen */
4707                 SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT - failed timer?\n");
4708                 return;
4709         }
4710         /* start the INIT timer */
4711         sctp_timer_start(SCTP_TIMER_TYPE_INIT, inp, stcb, net);
4712
4713         m = sctp_get_mbuf_for_msg(MCLBYTES, 1, M_NOWAIT, 1, MT_DATA);
4714         if (m == NULL) {
4715                 /* No memory, INIT timer will re-attempt. */
4716                 SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT - mbuf?\n");
4717                 return;
4718         }
4719         chunk_len = (uint16_t)sizeof(struct sctp_init_chunk);
4720         padding_len = 0;
4721         /* Now lets put the chunk header in place */
4722         init = mtod(m, struct sctp_init_chunk *);
4723         /* now the chunk header */
4724         init->ch.chunk_type = SCTP_INITIATION;
4725         init->ch.chunk_flags = 0;
4726         /* fill in later from mbuf we build */
4727         init->ch.chunk_length = 0;
4728         /* place in my tag */
4729         init->init.initiate_tag = htonl(stcb->asoc.my_vtag);
4730         /* set up some of the credits. */
4731         init->init.a_rwnd = htonl(max(inp->sctp_socket ? SCTP_SB_LIMIT_RCV(inp->sctp_socket) : 0,
4732             SCTP_MINIMAL_RWND));
4733         init->init.num_outbound_streams = htons(stcb->asoc.pre_open_streams);
4734         init->init.num_inbound_streams = htons(stcb->asoc.max_inbound_streams);
4735         init->init.initial_tsn = htonl(stcb->asoc.init_seq_number);
4736
4737         /* Adaptation layer indication parameter */
4738         if (inp->sctp_ep.adaptation_layer_indicator_provided) {
4739                 parameter_len = (uint16_t)sizeof(struct sctp_adaptation_layer_indication);
4740                 ali = (struct sctp_adaptation_layer_indication *)(mtod(m, caddr_t)+chunk_len);
4741                 ali->ph.param_type = htons(SCTP_ULP_ADAPTATION);
4742                 ali->ph.param_length = htons(parameter_len);
4743                 ali->indication = htonl(inp->sctp_ep.adaptation_layer_indicator);
4744                 chunk_len += parameter_len;
4745         }
4746
4747         /* ECN parameter */
4748         if (stcb->asoc.ecn_supported == 1) {
4749                 parameter_len = (uint16_t)sizeof(struct sctp_paramhdr);
4750                 ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
4751                 ph->param_type = htons(SCTP_ECN_CAPABLE);
4752                 ph->param_length = htons(parameter_len);
4753                 chunk_len += parameter_len;
4754         }
4755
4756         /* PR-SCTP supported parameter */
4757         if (stcb->asoc.prsctp_supported == 1) {
4758                 parameter_len = (uint16_t)sizeof(struct sctp_paramhdr);
4759                 ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
4760                 ph->param_type = htons(SCTP_PRSCTP_SUPPORTED);
4761                 ph->param_length = htons(parameter_len);
4762                 chunk_len += parameter_len;
4763         }
4764
4765         /* Add NAT friendly parameter. */
4766         if (SCTP_BASE_SYSCTL(sctp_inits_include_nat_friendly)) {
4767                 parameter_len = (uint16_t)sizeof(struct sctp_paramhdr);
4768                 ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
4769                 ph->param_type = htons(SCTP_HAS_NAT_SUPPORT);
4770                 ph->param_length = htons(parameter_len);
4771                 chunk_len += parameter_len;
4772         }
4773
4774         /* And now tell the peer which extensions we support */
4775         num_ext = 0;
4776         pr_supported = (struct sctp_supported_chunk_types_param *)(mtod(m, caddr_t)+chunk_len);
4777         if (stcb->asoc.prsctp_supported == 1) {
4778                 pr_supported->chunk_types[num_ext++] = SCTP_FORWARD_CUM_TSN;
4779                 if (stcb->asoc.idata_supported) {
4780                         pr_supported->chunk_types[num_ext++] = SCTP_IFORWARD_CUM_TSN;
4781                 }
4782         }
4783         if (stcb->asoc.auth_supported == 1) {
4784                 pr_supported->chunk_types[num_ext++] = SCTP_AUTHENTICATION;
4785         }
4786         if (stcb->asoc.asconf_supported == 1) {
4787                 pr_supported->chunk_types[num_ext++] = SCTP_ASCONF;
4788                 pr_supported->chunk_types[num_ext++] = SCTP_ASCONF_ACK;
4789         }
4790         if (stcb->asoc.reconfig_supported == 1) {
4791                 pr_supported->chunk_types[num_ext++] = SCTP_STREAM_RESET;
4792         }
4793         if (stcb->asoc.idata_supported) {
4794                 pr_supported->chunk_types[num_ext++] = SCTP_IDATA;
4795         }
4796         if (stcb->asoc.nrsack_supported == 1) {
4797                 pr_supported->chunk_types[num_ext++] = SCTP_NR_SELECTIVE_ACK;
4798         }
4799         if (stcb->asoc.pktdrop_supported == 1) {
4800                 pr_supported->chunk_types[num_ext++] = SCTP_PACKET_DROPPED;
4801         }
4802         if (num_ext > 0) {
4803                 parameter_len = (uint16_t)sizeof(struct sctp_supported_chunk_types_param) + num_ext;
4804                 pr_supported->ph.param_type = htons(SCTP_SUPPORTED_CHUNK_EXT);
4805                 pr_supported->ph.param_length = htons(parameter_len);
4806                 padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
4807                 chunk_len += parameter_len;
4808         }
4809         /* add authentication parameters */
4810         if (stcb->asoc.auth_supported) {
4811                 /* attach RANDOM parameter, if available */
4812                 if (stcb->asoc.authinfo.random != NULL) {
4813                         struct sctp_auth_random *randp;
4814
4815                         if (padding_len > 0) {
4816                                 memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
4817                                 chunk_len += padding_len;
4818                                 padding_len = 0;
4819                         }
4820                         randp = (struct sctp_auth_random *)(mtod(m, caddr_t)+chunk_len);
4821                         parameter_len = (uint16_t)sizeof(struct sctp_auth_random) + stcb->asoc.authinfo.random_len;
4822                         /* random key already contains the header */
4823                         memcpy(randp, stcb->asoc.authinfo.random->key, parameter_len);
4824                         padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
4825                         chunk_len += parameter_len;
4826                 }
4827                 /* add HMAC_ALGO parameter */
4828                 if (stcb->asoc.local_hmacs != NULL) {
4829                         struct sctp_auth_hmac_algo *hmacs;
4830
4831                         if (padding_len > 0) {
4832                                 memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
4833                                 chunk_len += padding_len;
4834                                 padding_len = 0;
4835                         }
4836                         hmacs = (struct sctp_auth_hmac_algo *)(mtod(m, caddr_t)+chunk_len);
4837                         parameter_len = (uint16_t)(sizeof(struct sctp_auth_hmac_algo) +
4838                             stcb->asoc.local_hmacs->num_algo * sizeof(uint16_t));
4839                         hmacs->ph.param_type = htons(SCTP_HMAC_LIST);
4840                         hmacs->ph.param_length = htons(parameter_len);
4841                         sctp_serialize_hmaclist(stcb->asoc.local_hmacs, (uint8_t *)hmacs->hmac_ids);
4842                         padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
4843                         chunk_len += parameter_len;
4844                 }
4845                 /* add CHUNKS parameter */
4846                 if (stcb->asoc.local_auth_chunks != NULL) {
4847                         struct sctp_auth_chunk_list *chunks;
4848
4849                         if (padding_len > 0) {
4850                                 memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
4851                                 chunk_len += padding_len;
4852                                 padding_len = 0;
4853                         }
4854                         chunks = (struct sctp_auth_chunk_list *)(mtod(m, caddr_t)+chunk_len);
4855                         parameter_len = (uint16_t)(sizeof(struct sctp_auth_chunk_list) +
4856                             sctp_auth_get_chklist_size(stcb->asoc.local_auth_chunks));
4857                         chunks->ph.param_type = htons(SCTP_CHUNK_LIST);
4858                         chunks->ph.param_length = htons(parameter_len);
4859                         sctp_serialize_auth_chunks(stcb->asoc.local_auth_chunks, chunks->chunk_types);
4860                         padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
4861                         chunk_len += parameter_len;
4862                 }
4863         }
4864
4865         /* now any cookie time extensions */
4866         if (stcb->asoc.cookie_preserve_req) {
4867                 struct sctp_cookie_perserve_param *cookie_preserve;
4868
4869                 if (padding_len > 0) {
4870                         memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
4871                         chunk_len += padding_len;
4872                         padding_len = 0;
4873                 }
4874                 parameter_len = (uint16_t)sizeof(struct sctp_cookie_perserve_param);
4875                 cookie_preserve = (struct sctp_cookie_perserve_param *)(mtod(m, caddr_t)+chunk_len);
4876                 cookie_preserve->ph.param_type = htons(SCTP_COOKIE_PRESERVE);
4877                 cookie_preserve->ph.param_length = htons(parameter_len);
4878                 cookie_preserve->time = htonl(stcb->asoc.cookie_preserve_req);
4879                 stcb->asoc.cookie_preserve_req = 0;
4880                 chunk_len += parameter_len;
4881         }
4882
4883         if (stcb->asoc.scope.ipv4_addr_legal || stcb->asoc.scope.ipv6_addr_legal) {
4884                 uint8_t i;
4885
4886                 if (padding_len > 0) {
4887                         memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
4888                         chunk_len += padding_len;
4889                         padding_len = 0;
4890                 }
4891                 parameter_len = (uint16_t)sizeof(struct sctp_paramhdr);
4892                 if (stcb->asoc.scope.ipv4_addr_legal) {
4893                         parameter_len += (uint16_t)sizeof(uint16_t);
4894                 }
4895                 if (stcb->asoc.scope.ipv6_addr_legal) {
4896                         parameter_len += (uint16_t)sizeof(uint16_t);
4897                 }
4898                 sup_addr = (struct sctp_supported_addr_param *)(mtod(m, caddr_t)+chunk_len);
4899                 sup_addr->ph.param_type = htons(SCTP_SUPPORTED_ADDRTYPE);
4900                 sup_addr->ph.param_length = htons(parameter_len);
4901                 i = 0;
4902                 if (stcb->asoc.scope.ipv4_addr_legal) {
4903                         sup_addr->addr_type[i++] = htons(SCTP_IPV4_ADDRESS);
4904                 }
4905                 if (stcb->asoc.scope.ipv6_addr_legal) {
4906                         sup_addr->addr_type[i++] = htons(SCTP_IPV6_ADDRESS);
4907                 }
4908                 padding_len = 4 - 2 * i;
4909                 chunk_len += parameter_len;
4910         }
4911
4912         SCTP_BUF_LEN(m) = chunk_len;
4913         /* now the addresses */
4914         /*
4915          * To optimize this we could put the scoping stuff into a structure
4916          * and remove the individual uint8's from the assoc structure. Then
4917          * we could just sifa in the address within the stcb. But for now
4918          * this is a quick hack to get the address stuff teased apart.
4919          */
4920         m_last = sctp_add_addresses_to_i_ia(inp, stcb, &stcb->asoc.scope,
4921             m, cnt_inits_to,
4922             &padding_len, &chunk_len);
4923
4924         init->ch.chunk_length = htons(chunk_len);
4925         if (padding_len > 0) {
4926                 if (sctp_add_pad_tombuf(m_last, padding_len) == NULL) {
4927                         sctp_m_freem(m);
4928                         return;
4929                 }
4930         }
4931         SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT - calls lowlevel_output\n");
4932         if ((error = sctp_lowlevel_chunk_output(inp, stcb, net,
4933             (struct sockaddr *)&net->ro._l_addr,
4934             m, 0, NULL, 0, 0, 0, 0,
4935             inp->sctp_lport, stcb->rport, htonl(0),
4936             net->port, NULL,
4937             0, 0,
4938             so_locked))) {
4939                 SCTPDBG(SCTP_DEBUG_OUTPUT4, "Gak send error %d\n", error);
4940                 if (error == ENOBUFS) {
4941                         stcb->asoc.ifp_had_enobuf = 1;
4942                         SCTP_STAT_INCR(sctps_lowlevelerr);
4943                 }
4944         } else {
4945                 stcb->asoc.ifp_had_enobuf = 0;
4946         }
4947         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
4948         (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
4949 }
4950
4951 struct mbuf *
4952 sctp_arethere_unrecognized_parameters(struct mbuf *in_initpkt,
4953     int param_offset, int *abort_processing, struct sctp_chunkhdr *cp, int *nat_friendly)
4954 {
4955         /*
4956          * Given a mbuf containing an INIT or INIT-ACK with the param_offset
4957          * being equal to the beginning of the params i.e. (iphlen +
4958          * sizeof(struct sctp_init_msg) parse through the parameters to the
4959          * end of the mbuf verifying that all parameters are known.
4960          *
4961          * For unknown parameters build and return a mbuf with
4962          * UNRECOGNIZED_PARAMETER errors. If the flags indicate to stop
4963          * processing this chunk stop, and set *abort_processing to 1.
4964          *
4965          * By having param_offset be pre-set to where parameters begin it is
4966          * hoped that this routine may be reused in the future by new
4967          * features.
4968          */
4969         struct sctp_paramhdr *phdr, params;
4970
4971         struct mbuf *mat, *op_err;
4972         char tempbuf[SCTP_PARAM_BUFFER_SIZE];
4973         int at, limit, pad_needed;
4974         uint16_t ptype, plen, padded_size;
4975         int err_at;
4976
4977         *abort_processing = 0;
4978         mat = in_initpkt;
4979         err_at = 0;
4980         limit = ntohs(cp->chunk_length) - sizeof(struct sctp_init_chunk);
4981         at = param_offset;
4982         op_err = NULL;
4983         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Check for unrecognized param's\n");
4984         phdr = sctp_get_next_param(mat, at, &params, sizeof(params));
4985         while ((phdr != NULL) && ((size_t)limit >= sizeof(struct sctp_paramhdr))) {
4986                 ptype = ntohs(phdr->param_type);
4987                 plen = ntohs(phdr->param_length);
4988                 if ((plen > limit) || (plen < sizeof(struct sctp_paramhdr))) {
4989                         /* wacked parameter */
4990                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error %d\n", plen);
4991                         goto invalid_size;
4992                 }
4993                 limit -= SCTP_SIZE32(plen);
4994                 /*-
4995                  * All parameters for all chunks that we know/understand are
4996                  * listed here. We process them other places and make
4997                  * appropriate stop actions per the upper bits. However this
4998                  * is the generic routine processor's can call to get back
4999                  * an operr.. to either incorporate (init-ack) or send.
5000                  */
5001                 padded_size = SCTP_SIZE32(plen);
5002                 switch (ptype) {
5003                         /* Param's with variable size */
5004                 case SCTP_HEARTBEAT_INFO:
5005                 case SCTP_STATE_COOKIE:
5006                 case SCTP_UNRECOG_PARAM:
5007                 case SCTP_ERROR_CAUSE_IND:
5008                         /* ok skip fwd */
5009                         at += padded_size;
5010                         break;
5011                         /* Param's with variable size within a range */
5012                 case SCTP_CHUNK_LIST:
5013                 case SCTP_SUPPORTED_CHUNK_EXT:
5014                         if (padded_size > (sizeof(struct sctp_supported_chunk_types_param) + (sizeof(uint8_t) * SCTP_MAX_SUPPORTED_EXT))) {
5015                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error chklist %d\n", plen);
5016                                 goto invalid_size;
5017                         }
5018                         at += padded_size;
5019                         break;
5020                 case SCTP_SUPPORTED_ADDRTYPE:
5021                         if (padded_size > SCTP_MAX_ADDR_PARAMS_SIZE) {
5022                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error supaddrtype %d\n", plen);
5023                                 goto invalid_size;
5024                         }
5025                         at += padded_size;
5026                         break;
5027                 case SCTP_RANDOM:
5028                         if (padded_size > (sizeof(struct sctp_auth_random) + SCTP_RANDOM_MAX_SIZE)) {
5029                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error random %d\n", plen);
5030                                 goto invalid_size;
5031                         }
5032                         at += padded_size;
5033                         break;
5034                 case SCTP_SET_PRIM_ADDR:
5035                 case SCTP_DEL_IP_ADDRESS:
5036                 case SCTP_ADD_IP_ADDRESS:
5037                         if ((padded_size != sizeof(struct sctp_asconf_addrv4_param)) &&
5038                             (padded_size != sizeof(struct sctp_asconf_addr_param))) {
5039                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error setprim %d\n", plen);
5040                                 goto invalid_size;
5041                         }
5042                         at += padded_size;
5043                         break;
5044                         /* Param's with a fixed size */
5045                 case SCTP_IPV4_ADDRESS:
5046                         if (padded_size != sizeof(struct sctp_ipv4addr_param)) {
5047                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error ipv4 addr %d\n", plen);
5048                                 goto invalid_size;
5049                         }
5050                         at += padded_size;
5051                         break;
5052                 case SCTP_IPV6_ADDRESS:
5053                         if (padded_size != sizeof(struct sctp_ipv6addr_param)) {
5054                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error ipv6 addr %d\n", plen);
5055                                 goto invalid_size;
5056                         }
5057                         at += padded_size;
5058                         break;
5059                 case SCTP_COOKIE_PRESERVE:
5060                         if (padded_size != sizeof(struct sctp_cookie_perserve_param)) {
5061                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error cookie-preserve %d\n", plen);
5062                                 goto invalid_size;
5063                         }
5064                         at += padded_size;
5065                         break;
5066                 case SCTP_HAS_NAT_SUPPORT:
5067                         *nat_friendly = 1;
5068                         /* fall through */
5069                 case SCTP_PRSCTP_SUPPORTED:
5070                         if (padded_size != sizeof(struct sctp_paramhdr)) {
5071                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error prsctp/nat support %d\n", plen);
5072                                 goto invalid_size;
5073                         }
5074                         at += padded_size;
5075                         break;
5076                 case SCTP_ECN_CAPABLE:
5077                         if (padded_size != sizeof(struct sctp_paramhdr)) {
5078                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error ecn %d\n", plen);
5079                                 goto invalid_size;
5080                         }
5081                         at += padded_size;
5082                         break;
5083                 case SCTP_ULP_ADAPTATION:
5084                         if (padded_size != sizeof(struct sctp_adaptation_layer_indication)) {
5085                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error adapatation %d\n", plen);
5086                                 goto invalid_size;
5087                         }
5088                         at += padded_size;
5089                         break;
5090                 case SCTP_SUCCESS_REPORT:
5091                         if (padded_size != sizeof(struct sctp_asconf_paramhdr)) {
5092                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error success %d\n", plen);
5093                                 goto invalid_size;
5094                         }
5095                         at += padded_size;
5096                         break;
5097                 case SCTP_HOSTNAME_ADDRESS:
5098                         {
5099                                 /* We can NOT handle HOST NAME addresses!! */
5100                                 int l_len;
5101
5102                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Can't handle hostname addresses.. abort processing\n");
5103                                 *abort_processing = 1;
5104                                 if (op_err == NULL) {
5105                                         /* Ok need to try to get a mbuf */
5106 #ifdef INET6
5107                                         l_len = SCTP_MIN_OVERHEAD;
5108 #else
5109                                         l_len = SCTP_MIN_V4_OVERHEAD;
5110 #endif
5111                                         l_len += sizeof(struct sctp_chunkhdr);
5112                                         l_len += plen;
5113                                         l_len += sizeof(struct sctp_paramhdr);
5114                                         op_err = sctp_get_mbuf_for_msg(l_len, 0, M_NOWAIT, 1, MT_DATA);
5115                                         if (op_err) {
5116                                                 SCTP_BUF_LEN(op_err) = 0;
5117                                                 /*
5118                                                  * pre-reserve space for ip
5119                                                  * and sctp header  and
5120                                                  * chunk hdr
5121                                                  */
5122 #ifdef INET6
5123                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip6_hdr));
5124 #else
5125                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip));
5126 #endif
5127                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctphdr));
5128                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctp_chunkhdr));
5129                                         }
5130                                 }
5131                                 if (op_err) {
5132                                         /* If we have space */
5133                                         struct sctp_paramhdr s;
5134
5135                                         if (err_at % 4) {
5136                                                 uint32_t cpthis = 0;
5137
5138                                                 pad_needed = 4 - (err_at % 4);
5139                                                 m_copyback(op_err, err_at, pad_needed, (caddr_t)&cpthis);
5140                                                 err_at += pad_needed;
5141                                         }
5142                                         s.param_type = htons(SCTP_CAUSE_UNRESOLVABLE_ADDR);
5143                                         s.param_length = htons(sizeof(s) + plen);
5144                                         m_copyback(op_err, err_at, sizeof(s), (caddr_t)&s);
5145                                         err_at += sizeof(s);
5146                                         if (plen > sizeof(tempbuf)) {
5147                                                 plen = sizeof(tempbuf);
5148                                         }
5149                                         phdr = sctp_get_next_param(mat, at, (struct sctp_paramhdr *)tempbuf, plen);
5150                                         if (phdr == NULL) {
5151                                                 sctp_m_freem(op_err);
5152                                                 /*
5153                                                  * we are out of memory but
5154                                                  * we still need to have a
5155                                                  * look at what to do (the
5156                                                  * system is in trouble
5157                                                  * though).
5158                                                  */
5159                                                 return (NULL);
5160                                         }
5161                                         m_copyback(op_err, err_at, plen, (caddr_t)phdr);
5162                                 }
5163                                 return (op_err);
5164                                 break;
5165                         }
5166                 default:
5167                         /*
5168                          * we do not recognize the parameter figure out what
5169                          * we do.
5170                          */
5171                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Hit default param %x\n", ptype);
5172                         if ((ptype & 0x4000) == 0x4000) {
5173                                 /* Report bit is set?? */
5174                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "report op err\n");
5175                                 if (op_err == NULL) {
5176                                         int l_len;
5177
5178                                         /* Ok need to try to get an mbuf */
5179 #ifdef INET6
5180                                         l_len = SCTP_MIN_OVERHEAD;
5181 #else
5182                                         l_len = SCTP_MIN_V4_OVERHEAD;
5183 #endif
5184                                         l_len += sizeof(struct sctp_chunkhdr);
5185                                         l_len += plen;
5186                                         l_len += sizeof(struct sctp_paramhdr);
5187                                         op_err = sctp_get_mbuf_for_msg(l_len, 0, M_NOWAIT, 1, MT_DATA);
5188                                         if (op_err) {
5189                                                 SCTP_BUF_LEN(op_err) = 0;
5190 #ifdef INET6
5191                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip6_hdr));
5192 #else
5193                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip));
5194 #endif
5195                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctphdr));
5196                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctp_chunkhdr));
5197                                         }
5198                                 }
5199                                 if (op_err) {
5200                                         /* If we have space */
5201                                         struct sctp_paramhdr s;
5202
5203                                         if (err_at % 4) {
5204                                                 uint32_t cpthis = 0;
5205
5206                                                 pad_needed = 4 - (err_at % 4);
5207                                                 m_copyback(op_err, err_at, pad_needed, (caddr_t)&cpthis);
5208                                                 err_at += pad_needed;
5209                                         }
5210                                         s.param_type = htons(SCTP_UNRECOG_PARAM);
5211                                         s.param_length = htons(sizeof(s) + plen);
5212                                         m_copyback(op_err, err_at, sizeof(s), (caddr_t)&s);
5213                                         err_at += sizeof(s);
5214                                         if (plen > sizeof(tempbuf)) {
5215                                                 plen = sizeof(tempbuf);
5216                                         }
5217                                         phdr = sctp_get_next_param(mat, at, (struct sctp_paramhdr *)tempbuf, plen);
5218                                         if (phdr == NULL) {
5219                                                 sctp_m_freem(op_err);
5220                                                 /*
5221                                                  * we are out of memory but
5222                                                  * we still need to have a
5223                                                  * look at what to do (the
5224                                                  * system is in trouble
5225                                                  * though).
5226                                                  */
5227                                                 op_err = NULL;
5228                                                 goto more_processing;
5229                                         }
5230                                         m_copyback(op_err, err_at, plen, (caddr_t)phdr);
5231                                         err_at += plen;
5232                                 }
5233                         }
5234         more_processing:
5235                         if ((ptype & 0x8000) == 0x0000) {
5236                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "stop proc\n");
5237                                 return (op_err);
5238                         } else {
5239                                 /* skip this chunk and continue processing */
5240                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "move on\n");
5241                                 at += SCTP_SIZE32(plen);
5242                         }
5243                         break;
5244
5245                 }
5246                 phdr = sctp_get_next_param(mat, at, &params, sizeof(params));
5247         }
5248         return (op_err);
5249 invalid_size:
5250         SCTPDBG(SCTP_DEBUG_OUTPUT1, "abort flag set\n");
5251         *abort_processing = 1;
5252         if ((op_err == NULL) && phdr) {
5253                 int l_len;
5254 #ifdef INET6
5255                 l_len = SCTP_MIN_OVERHEAD;
5256 #else
5257                 l_len = SCTP_MIN_V4_OVERHEAD;
5258 #endif
5259                 l_len += sizeof(struct sctp_chunkhdr);
5260                 l_len += (2 * sizeof(struct sctp_paramhdr));
5261                 op_err = sctp_get_mbuf_for_msg(l_len, 0, M_NOWAIT, 1, MT_DATA);
5262                 if (op_err) {
5263                         SCTP_BUF_LEN(op_err) = 0;
5264 #ifdef INET6
5265                         SCTP_BUF_RESV_UF(op_err, sizeof(struct ip6_hdr));
5266 #else
5267                         SCTP_BUF_RESV_UF(op_err, sizeof(struct ip));
5268 #endif
5269                         SCTP_BUF_RESV_UF(op_err, sizeof(struct sctphdr));
5270                         SCTP_BUF_RESV_UF(op_err, sizeof(struct sctp_chunkhdr));
5271                 }
5272         }
5273         if ((op_err) && phdr) {
5274                 struct sctp_paramhdr s;
5275
5276                 if (err_at % 4) {
5277                         uint32_t cpthis = 0;
5278
5279                         pad_needed = 4 - (err_at % 4);
5280                         m_copyback(op_err, err_at, pad_needed, (caddr_t)&cpthis);
5281                         err_at += pad_needed;
5282                 }
5283                 s.param_type = htons(SCTP_CAUSE_PROTOCOL_VIOLATION);
5284                 s.param_length = htons(sizeof(s) + sizeof(struct sctp_paramhdr));
5285                 m_copyback(op_err, err_at, sizeof(s), (caddr_t)&s);
5286                 err_at += sizeof(s);
5287                 /* Only copy back the p-hdr that caused the issue */
5288                 m_copyback(op_err, err_at, sizeof(struct sctp_paramhdr), (caddr_t)phdr);
5289         }
5290         return (op_err);
5291 }
5292
5293 static int
5294 sctp_are_there_new_addresses(struct sctp_association *asoc,
5295     struct mbuf *in_initpkt, int offset, struct sockaddr *src)
5296 {
5297         /*
5298          * Given a INIT packet, look through the packet to verify that there
5299          * are NO new addresses. As we go through the parameters add reports
5300          * of any un-understood parameters that require an error.  Also we
5301          * must return (1) to drop the packet if we see a un-understood
5302          * parameter that tells us to drop the chunk.
5303          */
5304         struct sockaddr *sa_touse;
5305         struct sockaddr *sa;
5306         struct sctp_paramhdr *phdr, params;
5307         uint16_t ptype, plen;
5308         uint8_t fnd;
5309         struct sctp_nets *net;
5310         int check_src;
5311 #ifdef INET
5312         struct sockaddr_in sin4, *sa4;
5313 #endif
5314 #ifdef INET6
5315         struct sockaddr_in6 sin6, *sa6;
5316 #endif
5317
5318 #ifdef INET
5319         memset(&sin4, 0, sizeof(sin4));
5320         sin4.sin_family = AF_INET;
5321         sin4.sin_len = sizeof(sin4);
5322 #endif
5323 #ifdef INET6
5324         memset(&sin6, 0, sizeof(sin6));
5325         sin6.sin6_family = AF_INET6;
5326         sin6.sin6_len = sizeof(sin6);
5327 #endif
5328         /* First what about the src address of the pkt ? */
5329         check_src = 0;
5330         switch (src->sa_family) {
5331 #ifdef INET
5332         case AF_INET:
5333                 if (asoc->scope.ipv4_addr_legal) {
5334                         check_src = 1;
5335                 }
5336                 break;
5337 #endif
5338 #ifdef INET6
5339         case AF_INET6:
5340                 if (asoc->scope.ipv6_addr_legal) {
5341                         check_src = 1;
5342                 }
5343                 break;
5344 #endif
5345         default:
5346                 /* TSNH */
5347                 break;
5348         }
5349         if (check_src) {
5350                 fnd = 0;
5351                 TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
5352                         sa = (struct sockaddr *)&net->ro._l_addr;
5353                         if (sa->sa_family == src->sa_family) {
5354 #ifdef INET
5355                                 if (sa->sa_family == AF_INET) {
5356                                         struct sockaddr_in *src4;
5357
5358                                         sa4 = (struct sockaddr_in *)sa;
5359                                         src4 = (struct sockaddr_in *)src;
5360                                         if (sa4->sin_addr.s_addr == src4->sin_addr.s_addr) {
5361                                                 fnd = 1;
5362                                                 break;
5363                                         }
5364                                 }
5365 #endif
5366 #ifdef INET6
5367                                 if (sa->sa_family == AF_INET6) {
5368                                         struct sockaddr_in6 *src6;
5369
5370                                         sa6 = (struct sockaddr_in6 *)sa;
5371                                         src6 = (struct sockaddr_in6 *)src;
5372                                         if (SCTP6_ARE_ADDR_EQUAL(sa6, src6)) {
5373                                                 fnd = 1;
5374                                                 break;
5375                                         }
5376                                 }
5377 #endif
5378                         }
5379                 }
5380                 if (fnd == 0) {
5381                         /* New address added! no need to look further. */
5382                         return (1);
5383                 }
5384         }
5385         /* Ok so far lets munge through the rest of the packet */
5386         offset += sizeof(struct sctp_init_chunk);
5387         phdr = sctp_get_next_param(in_initpkt, offset, &params, sizeof(params));
5388         while (phdr) {
5389                 sa_touse = NULL;
5390                 ptype = ntohs(phdr->param_type);
5391                 plen = ntohs(phdr->param_length);
5392                 switch (ptype) {
5393 #ifdef INET
5394                 case SCTP_IPV4_ADDRESS:
5395                         {
5396                                 struct sctp_ipv4addr_param *p4, p4_buf;
5397
5398                                 if (plen != sizeof(struct sctp_ipv4addr_param)) {
5399                                         return (1);
5400                                 }
5401                                 phdr = sctp_get_next_param(in_initpkt, offset,
5402                                     (struct sctp_paramhdr *)&p4_buf, sizeof(p4_buf));
5403                                 if (phdr == NULL) {
5404                                         return (1);
5405                                 }
5406                                 if (asoc->scope.ipv4_addr_legal) {
5407                                         p4 = (struct sctp_ipv4addr_param *)phdr;
5408                                         sin4.sin_addr.s_addr = p4->addr;
5409                                         sa_touse = (struct sockaddr *)&sin4;
5410                                 }
5411                                 break;
5412                         }
5413 #endif
5414 #ifdef INET6
5415                 case SCTP_IPV6_ADDRESS:
5416                         {
5417                                 struct sctp_ipv6addr_param *p6, p6_buf;
5418
5419                                 if (plen != sizeof(struct sctp_ipv6addr_param)) {
5420                                         return (1);
5421                                 }
5422                                 phdr = sctp_get_next_param(in_initpkt, offset,
5423                                     (struct sctp_paramhdr *)&p6_buf, sizeof(p6_buf));
5424                                 if (phdr == NULL) {
5425                                         return (1);
5426                                 }
5427                                 if (asoc->scope.ipv6_addr_legal) {
5428                                         p6 = (struct sctp_ipv6addr_param *)phdr;
5429                                         memcpy((caddr_t)&sin6.sin6_addr, p6->addr,
5430                                             sizeof(p6->addr));
5431                                         sa_touse = (struct sockaddr *)&sin6;
5432                                 }
5433                                 break;
5434                         }
5435 #endif
5436                 default:
5437                         sa_touse = NULL;
5438                         break;
5439                 }
5440                 if (sa_touse) {
5441                         /* ok, sa_touse points to one to check */
5442                         fnd = 0;
5443                         TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
5444                                 sa = (struct sockaddr *)&net->ro._l_addr;
5445                                 if (sa->sa_family != sa_touse->sa_family) {
5446                                         continue;
5447                                 }
5448 #ifdef INET
5449                                 if (sa->sa_family == AF_INET) {
5450                                         sa4 = (struct sockaddr_in *)sa;
5451                                         if (sa4->sin_addr.s_addr ==
5452                                             sin4.sin_addr.s_addr) {
5453                                                 fnd = 1;
5454                                                 break;
5455                                         }
5456                                 }
5457 #endif
5458 #ifdef INET6
5459                                 if (sa->sa_family == AF_INET6) {
5460                                         sa6 = (struct sockaddr_in6 *)sa;
5461                                         if (SCTP6_ARE_ADDR_EQUAL(
5462                                             sa6, &sin6)) {
5463                                                 fnd = 1;
5464                                                 break;
5465                                         }
5466                                 }
5467 #endif
5468                         }
5469                         if (!fnd) {
5470                                 /* New addr added! no need to look further */
5471                                 return (1);
5472                         }
5473                 }
5474                 offset += SCTP_SIZE32(plen);
5475                 phdr = sctp_get_next_param(in_initpkt, offset, &params, sizeof(params));
5476         }
5477         return (0);
5478 }
5479
5480 /*
5481  * Given a MBUF chain that was sent into us containing an INIT. Build a
5482  * INIT-ACK with COOKIE and send back. We assume that the in_initpkt has done
5483  * a pullup to include IPv6/4header, SCTP header and initial part of INIT
5484  * message (i.e. the struct sctp_init_msg).
5485  */
5486 void
5487 sctp_send_initiate_ack(struct sctp_inpcb *inp, struct sctp_tcb *stcb,
5488     struct sctp_nets *src_net, struct mbuf *init_pkt,
5489     int iphlen, int offset,
5490     struct sockaddr *src, struct sockaddr *dst,
5491     struct sctphdr *sh, struct sctp_init_chunk *init_chk,
5492     uint8_t mflowtype, uint32_t mflowid,
5493     uint32_t vrf_id, uint16_t port)
5494 {
5495         struct sctp_association *asoc;
5496         struct mbuf *m, *m_tmp, *m_last, *m_cookie, *op_err;
5497         struct sctp_init_ack_chunk *initack;
5498         struct sctp_adaptation_layer_indication *ali;
5499         struct sctp_supported_chunk_types_param *pr_supported;
5500         struct sctp_paramhdr *ph;
5501         union sctp_sockstore *over_addr;
5502         struct sctp_scoping scp;
5503         struct timeval now;
5504 #ifdef INET
5505         struct sockaddr_in *dst4 = (struct sockaddr_in *)dst;
5506         struct sockaddr_in *src4 = (struct sockaddr_in *)src;
5507         struct sockaddr_in *sin;
5508 #endif
5509 #ifdef INET6
5510         struct sockaddr_in6 *dst6 = (struct sockaddr_in6 *)dst;
5511         struct sockaddr_in6 *src6 = (struct sockaddr_in6 *)src;
5512         struct sockaddr_in6 *sin6;
5513 #endif
5514         struct sockaddr *to;
5515         struct sctp_state_cookie stc;
5516         struct sctp_nets *net = NULL;
5517         uint8_t *signature = NULL;
5518         int cnt_inits_to = 0;
5519         uint16_t his_limit, i_want;
5520         int abort_flag;
5521         int nat_friendly = 0;
5522         int error;
5523         struct socket *so;
5524         uint16_t num_ext, chunk_len, padding_len, parameter_len;
5525
5526         if (stcb) {
5527                 asoc = &stcb->asoc;
5528         } else {
5529                 asoc = NULL;
5530         }
5531         if ((asoc != NULL) &&
5532             (SCTP_GET_STATE(asoc) != SCTP_STATE_COOKIE_WAIT)) {
5533                 if (sctp_are_there_new_addresses(asoc, init_pkt, offset, src)) {
5534                         /*
5535                          * new addresses, out of here in non-cookie-wait
5536                          * states
5537                          *
5538                          * Send an ABORT, without the new address error
5539                          * cause. This looks no different than if no
5540                          * listener was present.
5541                          */
5542                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
5543                             "Address added");
5544                         sctp_send_abort(init_pkt, iphlen, src, dst, sh, 0, op_err,
5545                             mflowtype, mflowid, inp->fibnum,
5546                             vrf_id, port);
5547                         return;
5548                 }
5549                 if (src_net != NULL && (src_net->port != port)) {
5550                         /*
5551                          * change of remote encapsulation port, out of here
5552                          * in non-cookie-wait states
5553                          *
5554                          * Send an ABORT, without an specific error cause.
5555                          * This looks no different than if no listener was
5556                          * present.
5557                          */
5558                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
5559                             "Remote encapsulation port changed");
5560                         sctp_send_abort(init_pkt, iphlen, src, dst, sh, 0, op_err,
5561                             mflowtype, mflowid, inp->fibnum,
5562                             vrf_id, port);
5563                         return;
5564                 }
5565         }
5566         abort_flag = 0;
5567         op_err = sctp_arethere_unrecognized_parameters(init_pkt,
5568             (offset + sizeof(struct sctp_init_chunk)),
5569             &abort_flag, (struct sctp_chunkhdr *)init_chk, &nat_friendly);
5570         if (abort_flag) {
5571 do_a_abort:
5572                 if (op_err == NULL) {
5573                         char msg[SCTP_DIAG_INFO_LEN];
5574
5575                         snprintf(msg, sizeof(msg), "%s:%d at %s", __FILE__, __LINE__, __func__);
5576                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
5577                             msg);
5578                 }
5579                 sctp_send_abort(init_pkt, iphlen, src, dst, sh,
5580                     init_chk->init.initiate_tag, op_err,
5581                     mflowtype, mflowid, inp->fibnum,
5582                     vrf_id, port);
5583                 return;
5584         }
5585         m = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
5586         if (m == NULL) {
5587                 /* No memory, INIT timer will re-attempt. */
5588                 if (op_err)
5589                         sctp_m_freem(op_err);
5590                 return;
5591         }
5592         chunk_len = (uint16_t)sizeof(struct sctp_init_ack_chunk);
5593         padding_len = 0;
5594
5595         /*
5596          * We might not overwrite the identification[] completely and on
5597          * some platforms time_entered will contain some padding. Therefore
5598          * zero out the cookie to avoid putting uninitialized memory on the
5599          * wire.
5600          */
5601         memset(&stc, 0, sizeof(struct sctp_state_cookie));
5602
5603         /* the time I built cookie */
5604         (void)SCTP_GETTIME_TIMEVAL(&now);
5605         stc.time_entered.tv_sec = now.tv_sec;
5606         stc.time_entered.tv_usec = now.tv_usec;
5607
5608         /* populate any tie tags */
5609         if (asoc != NULL) {
5610                 /* unlock before tag selections */
5611                 stc.tie_tag_my_vtag = asoc->my_vtag_nonce;
5612                 stc.tie_tag_peer_vtag = asoc->peer_vtag_nonce;
5613                 stc.cookie_life = asoc->cookie_life;
5614                 net = asoc->primary_destination;
5615         } else {
5616                 stc.tie_tag_my_vtag = 0;
5617                 stc.tie_tag_peer_vtag = 0;
5618                 /* life I will award this cookie */
5619                 stc.cookie_life = inp->sctp_ep.def_cookie_life;
5620         }
5621
5622         /* copy in the ports for later check */
5623         stc.myport = sh->dest_port;
5624         stc.peerport = sh->src_port;
5625
5626         /*
5627          * If we wanted to honor cookie life extensions, we would add to
5628          * stc.cookie_life. For now we should NOT honor any extension
5629          */
5630         stc.site_scope = stc.local_scope = stc.loopback_scope = 0;
5631         if (inp->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
5632                 stc.ipv6_addr_legal = 1;
5633                 if (SCTP_IPV6_V6ONLY(inp)) {
5634                         stc.ipv4_addr_legal = 0;
5635                 } else {
5636                         stc.ipv4_addr_legal = 1;
5637                 }
5638         } else {
5639                 stc.ipv6_addr_legal = 0;
5640                 stc.ipv4_addr_legal = 1;
5641         }
5642         stc.ipv4_scope = 0;
5643         if (net == NULL) {
5644                 to = src;
5645                 switch (dst->sa_family) {
5646 #ifdef INET
5647                 case AF_INET:
5648                         {
5649                                 /* lookup address */
5650                                 stc.address[0] = src4->sin_addr.s_addr;
5651                                 stc.address[1] = 0;
5652                                 stc.address[2] = 0;
5653                                 stc.address[3] = 0;
5654                                 stc.addr_type = SCTP_IPV4_ADDRESS;
5655                                 /* local from address */
5656                                 stc.laddress[0] = dst4->sin_addr.s_addr;
5657                                 stc.laddress[1] = 0;
5658                                 stc.laddress[2] = 0;
5659                                 stc.laddress[3] = 0;
5660                                 stc.laddr_type = SCTP_IPV4_ADDRESS;
5661                                 /* scope_id is only for v6 */
5662                                 stc.scope_id = 0;
5663                                 if ((IN4_ISPRIVATE_ADDRESS(&src4->sin_addr)) ||
5664                                     (IN4_ISPRIVATE_ADDRESS(&dst4->sin_addr))) {
5665                                         stc.ipv4_scope = 1;
5666                                 }
5667                                 /* Must use the address in this case */
5668                                 if (sctp_is_address_on_local_host(src, vrf_id)) {
5669                                         stc.loopback_scope = 1;
5670                                         stc.ipv4_scope = 1;
5671                                         stc.site_scope = 1;
5672                                         stc.local_scope = 0;
5673                                 }
5674                                 break;
5675                         }
5676 #endif
5677 #ifdef INET6
5678                 case AF_INET6:
5679                         {
5680                                 stc.addr_type = SCTP_IPV6_ADDRESS;
5681                                 memcpy(&stc.address, &src6->sin6_addr, sizeof(struct in6_addr));
5682                                 stc.scope_id = ntohs(in6_getscope(&src6->sin6_addr));
5683                                 if (sctp_is_address_on_local_host(src, vrf_id)) {
5684                                         stc.loopback_scope = 1;
5685                                         stc.local_scope = 0;
5686                                         stc.site_scope = 1;
5687                                         stc.ipv4_scope = 1;
5688                                 } else if (IN6_IS_ADDR_LINKLOCAL(&src6->sin6_addr) ||
5689                                     IN6_IS_ADDR_LINKLOCAL(&dst6->sin6_addr)) {
5690                                         /*
5691                                          * If the new destination or source
5692                                          * is a LINK_LOCAL we must have
5693                                          * common both site and local scope.
5694                                          * Don't set local scope though
5695                                          * since we must depend on the
5696                                          * source to be added implicitly. We
5697                                          * cannot assure just because we
5698                                          * share one link that all links are
5699                                          * common.
5700                                          */
5701                                         stc.local_scope = 0;
5702                                         stc.site_scope = 1;
5703                                         stc.ipv4_scope = 1;
5704                                         /*
5705                                          * we start counting for the private
5706                                          * address stuff at 1. since the
5707                                          * link local we source from won't
5708                                          * show up in our scoped count.
5709                                          */
5710                                         cnt_inits_to = 1;
5711                                         /*
5712                                          * pull out the scope_id from
5713                                          * incoming pkt
5714                                          */
5715                                 } else if (IN6_IS_ADDR_SITELOCAL(&src6->sin6_addr) ||
5716                                     IN6_IS_ADDR_SITELOCAL(&dst6->sin6_addr)) {
5717                                         /*
5718                                          * If the new destination or source
5719                                          * is SITE_LOCAL then we must have
5720                                          * site scope in common.
5721                                          */
5722                                         stc.site_scope = 1;
5723                                 }
5724                                 memcpy(&stc.laddress, &dst6->sin6_addr, sizeof(struct in6_addr));
5725                                 stc.laddr_type = SCTP_IPV6_ADDRESS;
5726                                 break;
5727                         }
5728 #endif
5729                 default:
5730                         /* TSNH */
5731                         goto do_a_abort;
5732                         break;
5733                 }
5734         } else {
5735                 /* set the scope per the existing tcb */
5736
5737 #ifdef INET6
5738                 struct sctp_nets *lnet;
5739 #endif
5740
5741                 stc.loopback_scope = asoc->scope.loopback_scope;
5742                 stc.ipv4_scope = asoc->scope.ipv4_local_scope;
5743                 stc.site_scope = asoc->scope.site_scope;
5744                 stc.local_scope = asoc->scope.local_scope;
5745 #ifdef INET6
5746                 /* Why do we not consider IPv4 LL addresses? */
5747                 TAILQ_FOREACH(lnet, &asoc->nets, sctp_next) {
5748                         if (lnet->ro._l_addr.sin6.sin6_family == AF_INET6) {
5749                                 if (IN6_IS_ADDR_LINKLOCAL(&lnet->ro._l_addr.sin6.sin6_addr)) {
5750                                         /*
5751                                          * if we have a LL address, start
5752                                          * counting at 1.
5753                                          */
5754                                         cnt_inits_to = 1;
5755                                 }
5756                         }
5757                 }
5758 #endif
5759                 /* use the net pointer */
5760                 to = (struct sockaddr *)&net->ro._l_addr;
5761                 switch (to->sa_family) {
5762 #ifdef INET
5763                 case AF_INET:
5764                         sin = (struct sockaddr_in *)to;
5765                         stc.address[0] = sin->sin_addr.s_addr;
5766                         stc.address[1] = 0;
5767                         stc.address[2] = 0;
5768                         stc.address[3] = 0;
5769                         stc.addr_type = SCTP_IPV4_ADDRESS;
5770                         if (net->src_addr_selected == 0) {
5771                                 /*
5772                                  * strange case here, the INIT should have
5773                                  * did the selection.
5774                                  */
5775                                 net->ro._s_addr = sctp_source_address_selection(inp,
5776                                     stcb, (sctp_route_t *)&net->ro,
5777                                     net, 0, vrf_id);
5778                                 if (net->ro._s_addr == NULL)
5779                                         return;
5780
5781                                 net->src_addr_selected = 1;
5782
5783                         }
5784                         stc.laddress[0] = net->ro._s_addr->address.sin.sin_addr.s_addr;
5785                         stc.laddress[1] = 0;
5786                         stc.laddress[2] = 0;
5787                         stc.laddress[3] = 0;
5788                         stc.laddr_type = SCTP_IPV4_ADDRESS;
5789                         /* scope_id is only for v6 */
5790                         stc.scope_id = 0;
5791                         break;
5792 #endif
5793 #ifdef INET6
5794                 case AF_INET6:
5795                         sin6 = (struct sockaddr_in6 *)to;
5796                         memcpy(&stc.address, &sin6->sin6_addr,
5797                             sizeof(struct in6_addr));
5798                         stc.addr_type = SCTP_IPV6_ADDRESS;
5799                         stc.scope_id = sin6->sin6_scope_id;
5800                         if (net->src_addr_selected == 0) {
5801                                 /*
5802                                  * strange case here, the INIT should have
5803                                  * done the selection.
5804                                  */
5805                                 net->ro._s_addr = sctp_source_address_selection(inp,
5806                                     stcb, (sctp_route_t *)&net->ro,
5807                                     net, 0, vrf_id);
5808                                 if (net->ro._s_addr == NULL)
5809                                         return;
5810
5811                                 net->src_addr_selected = 1;
5812                         }
5813                         memcpy(&stc.laddress, &net->ro._s_addr->address.sin6.sin6_addr,
5814                             sizeof(struct in6_addr));
5815                         stc.laddr_type = SCTP_IPV6_ADDRESS;
5816                         break;
5817 #endif
5818                 }
5819         }
5820         /* Now lets put the SCTP header in place */
5821         initack = mtod(m, struct sctp_init_ack_chunk *);
5822         /* Save it off for quick ref */
5823         stc.peers_vtag = ntohl(init_chk->init.initiate_tag);
5824         /* who are we */
5825         memcpy(stc.identification, SCTP_VERSION_STRING,
5826             min(strlen(SCTP_VERSION_STRING), sizeof(stc.identification)));
5827         memset(stc.reserved, 0, SCTP_RESERVE_SPACE);
5828         /* now the chunk header */
5829         initack->ch.chunk_type = SCTP_INITIATION_ACK;
5830         initack->ch.chunk_flags = 0;
5831         /* fill in later from mbuf we build */
5832         initack->ch.chunk_length = 0;
5833         /* place in my tag */
5834         if ((asoc != NULL) &&
5835             ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) ||
5836             (SCTP_GET_STATE(asoc) == SCTP_STATE_INUSE) ||
5837             (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED))) {
5838                 /* re-use the v-tags and init-seq here */
5839                 initack->init.initiate_tag = htonl(asoc->my_vtag);
5840                 initack->init.initial_tsn = htonl(asoc->init_seq_number);
5841         } else {
5842                 uint32_t vtag, itsn;
5843
5844                 if (asoc) {
5845                         atomic_add_int(&asoc->refcnt, 1);
5846                         SCTP_TCB_UNLOCK(stcb);
5847         new_tag:
5848                         vtag = sctp_select_a_tag(inp, inp->sctp_lport, sh->src_port, 1);
5849                         if ((asoc->peer_supports_nat) && (vtag == asoc->my_vtag)) {
5850                                 /*
5851                                  * Got a duplicate vtag on some guy behind a
5852                                  * nat make sure we don't use it.
5853                                  */
5854                                 goto new_tag;
5855                         }
5856                         initack->init.initiate_tag = htonl(vtag);
5857                         /* get a TSN to use too */
5858                         itsn = sctp_select_initial_TSN(&inp->sctp_ep);
5859                         initack->init.initial_tsn = htonl(itsn);
5860                         SCTP_TCB_LOCK(stcb);
5861                         atomic_add_int(&asoc->refcnt, -1);
5862                 } else {
5863                         SCTP_INP_INCR_REF(inp);
5864                         SCTP_INP_RUNLOCK(inp);
5865                         vtag = sctp_select_a_tag(inp, inp->sctp_lport, sh->src_port, 1);
5866                         initack->init.initiate_tag = htonl(vtag);
5867                         /* get a TSN to use too */
5868                         initack->init.initial_tsn = htonl(sctp_select_initial_TSN(&inp->sctp_ep));
5869                         SCTP_INP_RLOCK(inp);
5870                         SCTP_INP_DECR_REF(inp);
5871                 }
5872         }
5873         /* save away my tag to */
5874         stc.my_vtag = initack->init.initiate_tag;
5875
5876         /* set up some of the credits. */
5877         so = inp->sctp_socket;
5878         if (so == NULL) {
5879                 /* memory problem */
5880                 sctp_m_freem(m);
5881                 return;
5882         } else {
5883                 initack->init.a_rwnd = htonl(max(SCTP_SB_LIMIT_RCV(so), SCTP_MINIMAL_RWND));
5884         }
5885         /* set what I want */
5886         his_limit = ntohs(init_chk->init.num_inbound_streams);
5887         /* choose what I want */
5888         if (asoc != NULL) {
5889                 if (asoc->streamoutcnt > asoc->pre_open_streams) {
5890                         i_want = asoc->streamoutcnt;
5891                 } else {
5892                         i_want = asoc->pre_open_streams;
5893                 }
5894         } else {
5895                 i_want = inp->sctp_ep.pre_open_stream_count;
5896         }
5897         if (his_limit < i_want) {
5898                 /* I Want more :< */
5899                 initack->init.num_outbound_streams = init_chk->init.num_inbound_streams;
5900         } else {
5901                 /* I can have what I want :> */
5902                 initack->init.num_outbound_streams = htons(i_want);
5903         }
5904         /* tell him his limit. */
5905         initack->init.num_inbound_streams =
5906             htons(inp->sctp_ep.max_open_streams_intome);
5907
5908         /* adaptation layer indication parameter */
5909         if (inp->sctp_ep.adaptation_layer_indicator_provided) {
5910                 parameter_len = (uint16_t)sizeof(struct sctp_adaptation_layer_indication);
5911                 ali = (struct sctp_adaptation_layer_indication *)(mtod(m, caddr_t)+chunk_len);
5912                 ali->ph.param_type = htons(SCTP_ULP_ADAPTATION);
5913                 ali->ph.param_length = htons(parameter_len);
5914                 ali->indication = htonl(inp->sctp_ep.adaptation_layer_indicator);
5915                 chunk_len += parameter_len;
5916         }
5917
5918         /* ECN parameter */
5919         if (((asoc != NULL) && (asoc->ecn_supported == 1)) ||
5920             ((asoc == NULL) && (inp->ecn_supported == 1))) {
5921                 parameter_len = (uint16_t)sizeof(struct sctp_paramhdr);
5922                 ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
5923                 ph->param_type = htons(SCTP_ECN_CAPABLE);
5924                 ph->param_length = htons(parameter_len);
5925                 chunk_len += parameter_len;
5926         }
5927
5928         /* PR-SCTP supported parameter */
5929         if (((asoc != NULL) && (asoc->prsctp_supported == 1)) ||
5930             ((asoc == NULL) && (inp->prsctp_supported == 1))) {
5931                 parameter_len = (uint16_t)sizeof(struct sctp_paramhdr);
5932                 ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
5933                 ph->param_type = htons(SCTP_PRSCTP_SUPPORTED);
5934                 ph->param_length = htons(parameter_len);
5935                 chunk_len += parameter_len;
5936         }
5937
5938         /* Add NAT friendly parameter */
5939         if (nat_friendly) {
5940                 parameter_len = (uint16_t)sizeof(struct sctp_paramhdr);
5941                 ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
5942                 ph->param_type = htons(SCTP_HAS_NAT_SUPPORT);
5943                 ph->param_length = htons(parameter_len);
5944                 chunk_len += parameter_len;
5945         }
5946
5947         /* And now tell the peer which extensions we support */
5948         num_ext = 0;
5949         pr_supported = (struct sctp_supported_chunk_types_param *)(mtod(m, caddr_t)+chunk_len);
5950         if (((asoc != NULL) && (asoc->prsctp_supported == 1)) ||
5951             ((asoc == NULL) && (inp->prsctp_supported == 1))) {
5952                 pr_supported->chunk_types[num_ext++] = SCTP_FORWARD_CUM_TSN;
5953                 if (((asoc != NULL) && (asoc->idata_supported == 1)) ||
5954                     ((asoc == NULL) && (inp->idata_supported == 1))) {
5955                         pr_supported->chunk_types[num_ext++] = SCTP_IFORWARD_CUM_TSN;
5956                 }
5957         }
5958         if (((asoc != NULL) && (asoc->auth_supported == 1)) ||
5959             ((asoc == NULL) && (inp->auth_supported == 1))) {
5960                 pr_supported->chunk_types[num_ext++] = SCTP_AUTHENTICATION;
5961         }
5962         if (((asoc != NULL) && (asoc->asconf_supported == 1)) ||
5963             ((asoc == NULL) && (inp->asconf_supported == 1))) {
5964                 pr_supported->chunk_types[num_ext++] = SCTP_ASCONF;
5965                 pr_supported->chunk_types[num_ext++] = SCTP_ASCONF_ACK;
5966         }
5967         if (((asoc != NULL) && (asoc->reconfig_supported == 1)) ||
5968             ((asoc == NULL) && (inp->reconfig_supported == 1))) {
5969                 pr_supported->chunk_types[num_ext++] = SCTP_STREAM_RESET;
5970         }
5971         if (((asoc != NULL) && (asoc->idata_supported == 1)) ||
5972             ((asoc == NULL) && (inp->idata_supported == 1))) {
5973                 pr_supported->chunk_types[num_ext++] = SCTP_IDATA;
5974         }
5975         if (((asoc != NULL) && (asoc->nrsack_supported == 1)) ||
5976             ((asoc == NULL) && (inp->nrsack_supported == 1))) {
5977                 pr_supported->chunk_types[num_ext++] = SCTP_NR_SELECTIVE_ACK;
5978         }
5979         if (((asoc != NULL) && (asoc->pktdrop_supported == 1)) ||
5980             ((asoc == NULL) && (inp->pktdrop_supported == 1))) {
5981                 pr_supported->chunk_types[num_ext++] = SCTP_PACKET_DROPPED;
5982         }
5983         if (num_ext > 0) {
5984                 parameter_len = (uint16_t)sizeof(struct sctp_supported_chunk_types_param) + num_ext;
5985                 pr_supported->ph.param_type = htons(SCTP_SUPPORTED_CHUNK_EXT);
5986                 pr_supported->ph.param_length = htons(parameter_len);
5987                 padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
5988                 chunk_len += parameter_len;
5989         }
5990
5991         /* add authentication parameters */
5992         if (((asoc != NULL) && (asoc->auth_supported == 1)) ||
5993             ((asoc == NULL) && (inp->auth_supported == 1))) {
5994                 struct sctp_auth_random *randp;
5995                 struct sctp_auth_hmac_algo *hmacs;
5996                 struct sctp_auth_chunk_list *chunks;
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                 /* generate and add RANDOM parameter */
6004                 randp = (struct sctp_auth_random *)(mtod(m, caddr_t)+chunk_len);
6005                 parameter_len = (uint16_t)sizeof(struct sctp_auth_random) +
6006                     SCTP_AUTH_RANDOM_SIZE_DEFAULT;
6007                 randp->ph.param_type = htons(SCTP_RANDOM);
6008                 randp->ph.param_length = htons(parameter_len);
6009                 SCTP_READ_RANDOM(randp->random_data, SCTP_AUTH_RANDOM_SIZE_DEFAULT);
6010                 padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
6011                 chunk_len += parameter_len;
6012
6013                 if (padding_len > 0) {
6014                         memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
6015                         chunk_len += padding_len;
6016                         padding_len = 0;
6017                 }
6018                 /* add HMAC_ALGO parameter */
6019                 hmacs = (struct sctp_auth_hmac_algo *)(mtod(m, caddr_t)+chunk_len);
6020                 parameter_len = (uint16_t)sizeof(struct sctp_auth_hmac_algo) +
6021                     sctp_serialize_hmaclist(inp->sctp_ep.local_hmacs,
6022                     (uint8_t *)hmacs->hmac_ids);
6023                 hmacs->ph.param_type = htons(SCTP_HMAC_LIST);
6024                 hmacs->ph.param_length = htons(parameter_len);
6025                 padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
6026                 chunk_len += parameter_len;
6027
6028                 if (padding_len > 0) {
6029                         memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
6030                         chunk_len += padding_len;
6031                         padding_len = 0;
6032                 }
6033                 /* add CHUNKS parameter */
6034                 chunks = (struct sctp_auth_chunk_list *)(mtod(m, caddr_t)+chunk_len);
6035                 parameter_len = (uint16_t)sizeof(struct sctp_auth_chunk_list) +
6036                     sctp_serialize_auth_chunks(inp->sctp_ep.local_auth_chunks,
6037                     chunks->chunk_types);
6038                 chunks->ph.param_type = htons(SCTP_CHUNK_LIST);
6039                 chunks->ph.param_length = htons(parameter_len);
6040                 padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
6041                 chunk_len += parameter_len;
6042         }
6043         SCTP_BUF_LEN(m) = chunk_len;
6044         m_last = m;
6045         /* now the addresses */
6046         /*
6047          * To optimize this we could put the scoping stuff into a structure
6048          * and remove the individual uint8's from the stc structure. Then we
6049          * could just sifa in the address within the stc.. but for now this
6050          * is a quick hack to get the address stuff teased apart.
6051          */
6052         scp.ipv4_addr_legal = stc.ipv4_addr_legal;
6053         scp.ipv6_addr_legal = stc.ipv6_addr_legal;
6054         scp.loopback_scope = stc.loopback_scope;
6055         scp.ipv4_local_scope = stc.ipv4_scope;
6056         scp.local_scope = stc.local_scope;
6057         scp.site_scope = stc.site_scope;
6058         m_last = sctp_add_addresses_to_i_ia(inp, stcb, &scp, m_last,
6059             cnt_inits_to,
6060             &padding_len, &chunk_len);
6061         /* padding_len can only be positive, if no addresses have been added */
6062         if (padding_len > 0) {
6063                 memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
6064                 chunk_len += padding_len;
6065                 SCTP_BUF_LEN(m) += padding_len;
6066                 padding_len = 0;
6067         }
6068
6069         /* tack on the operational error if present */
6070         if (op_err) {
6071                 parameter_len = 0;
6072                 for (m_tmp = op_err; m_tmp != NULL; m_tmp = SCTP_BUF_NEXT(m_tmp)) {
6073                         parameter_len += SCTP_BUF_LEN(m_tmp);
6074                 }
6075                 padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
6076                 SCTP_BUF_NEXT(m_last) = op_err;
6077                 while (SCTP_BUF_NEXT(m_last) != NULL) {
6078                         m_last = SCTP_BUF_NEXT(m_last);
6079                 }
6080                 chunk_len += parameter_len;
6081         }
6082         if (padding_len > 0) {
6083                 m_last = sctp_add_pad_tombuf(m_last, padding_len);
6084                 if (m_last == NULL) {
6085                         /* Houston we have a problem, no space */
6086                         sctp_m_freem(m);
6087                         return;
6088                 }
6089                 chunk_len += padding_len;
6090                 padding_len = 0;
6091         }
6092         /* Now we must build a cookie */
6093         m_cookie = sctp_add_cookie(init_pkt, offset, m, 0, &stc, &signature);
6094         if (m_cookie == NULL) {
6095                 /* memory problem */
6096                 sctp_m_freem(m);
6097                 return;
6098         }
6099         /* Now append the cookie to the end and update the space/size */
6100         SCTP_BUF_NEXT(m_last) = m_cookie;
6101         parameter_len = 0;
6102         for (m_tmp = m_cookie; m_tmp != NULL; m_tmp = SCTP_BUF_NEXT(m_tmp)) {
6103                 parameter_len += SCTP_BUF_LEN(m_tmp);
6104                 if (SCTP_BUF_NEXT(m_tmp) == NULL) {
6105                         m_last = m_tmp;
6106                 }
6107         }
6108         padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
6109         chunk_len += parameter_len;
6110
6111         /*
6112          * Place in the size, but we don't include the last pad (if any) in
6113          * the INIT-ACK.
6114          */
6115         initack->ch.chunk_length = htons(chunk_len);
6116
6117         /*
6118          * Time to sign the cookie, we don't sign over the cookie signature
6119          * though thus we set trailer.
6120          */
6121         (void)sctp_hmac_m(SCTP_HMAC,
6122             (uint8_t *)inp->sctp_ep.secret_key[(int)(inp->sctp_ep.current_secret_number)],
6123             SCTP_SECRET_SIZE, m_cookie, sizeof(struct sctp_paramhdr),
6124             (uint8_t *)signature, SCTP_SIGNATURE_SIZE);
6125         /*
6126          * We sifa 0 here to NOT set IP_DF if its IPv4, we ignore the return
6127          * here since the timer will drive a retranmission.
6128          */
6129         if (padding_len > 0) {
6130                 if (sctp_add_pad_tombuf(m_last, padding_len) == NULL) {
6131                         sctp_m_freem(m);
6132                         return;
6133                 }
6134         }
6135         if (stc.loopback_scope) {
6136                 over_addr = (union sctp_sockstore *)dst;
6137         } else {
6138                 over_addr = NULL;
6139         }
6140
6141         if ((error = sctp_lowlevel_chunk_output(inp, NULL, NULL, to, m, 0, NULL, 0, 0,
6142             0, 0,
6143             inp->sctp_lport, sh->src_port, init_chk->init.initiate_tag,
6144             port, over_addr,
6145             mflowtype, mflowid,
6146             SCTP_SO_NOT_LOCKED))) {
6147                 SCTPDBG(SCTP_DEBUG_OUTPUT4, "Gak send error %d\n", error);
6148                 if (error == ENOBUFS) {
6149                         if (asoc != NULL) {
6150                                 asoc->ifp_had_enobuf = 1;
6151                         }
6152                         SCTP_STAT_INCR(sctps_lowlevelerr);
6153                 }
6154         } else {
6155                 if (asoc != NULL) {
6156                         asoc->ifp_had_enobuf = 0;
6157                 }
6158         }
6159         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
6160 }
6161
6162
6163 static void
6164 sctp_prune_prsctp(struct sctp_tcb *stcb,
6165     struct sctp_association *asoc,
6166     struct sctp_sndrcvinfo *srcv,
6167     int dataout)
6168 {
6169         int freed_spc = 0;
6170         struct sctp_tmit_chunk *chk, *nchk;
6171
6172         SCTP_TCB_LOCK_ASSERT(stcb);
6173         if ((asoc->prsctp_supported) &&
6174             (asoc->sent_queue_cnt_removeable > 0)) {
6175                 TAILQ_FOREACH(chk, &asoc->sent_queue, sctp_next) {
6176                         /*
6177                          * Look for chunks marked with the PR_SCTP flag AND
6178                          * the buffer space flag. If the one being sent is
6179                          * equal or greater priority then purge the old one
6180                          * and free some space.
6181                          */
6182                         if (PR_SCTP_BUF_ENABLED(chk->flags)) {
6183                                 /*
6184                                  * This one is PR-SCTP AND buffer space
6185                                  * limited type
6186                                  */
6187                                 if (chk->rec.data.timetodrop.tv_sec >= (long)srcv->sinfo_timetolive) {
6188                                         /*
6189                                          * Lower numbers equates to higher
6190                                          * priority so if the one we are
6191                                          * looking at has a larger or equal
6192                                          * priority we want to drop the data
6193                                          * and NOT retransmit it.
6194                                          */
6195                                         if (chk->data) {
6196                                                 /*
6197                                                  * We release the book_size
6198                                                  * if the mbuf is here
6199                                                  */
6200                                                 int ret_spc;
6201                                                 uint8_t sent;
6202
6203                                                 if (chk->sent > SCTP_DATAGRAM_UNSENT)
6204                                                         sent = 1;
6205                                                 else
6206                                                         sent = 0;
6207                                                 ret_spc = sctp_release_pr_sctp_chunk(stcb, chk,
6208                                                     sent,
6209                                                     SCTP_SO_LOCKED);
6210                                                 freed_spc += ret_spc;
6211                                                 if (freed_spc >= dataout) {
6212                                                         return;
6213                                                 }
6214                                         }       /* if chunk was present */
6215                                 }       /* if of sufficient priority */
6216                         }       /* if chunk has enabled */
6217                 }               /* tailqforeach */
6218
6219                 TAILQ_FOREACH_SAFE(chk, &asoc->send_queue, sctp_next, nchk) {
6220                         /* Here we must move to the sent queue and mark */
6221                         if (PR_SCTP_BUF_ENABLED(chk->flags)) {
6222                                 if (chk->rec.data.timetodrop.tv_sec >= (long)srcv->sinfo_timetolive) {
6223                                         if (chk->data) {
6224                                                 /*
6225                                                  * We release the book_size
6226                                                  * if the mbuf is here
6227                                                  */
6228                                                 int ret_spc;
6229
6230                                                 ret_spc = sctp_release_pr_sctp_chunk(stcb, chk,
6231                                                     0, SCTP_SO_LOCKED);
6232
6233                                                 freed_spc += ret_spc;
6234                                                 if (freed_spc >= dataout) {
6235                                                         return;
6236                                                 }
6237                                         }       /* end if chk->data */
6238                                 }       /* end if right class */
6239                         }       /* end if chk pr-sctp */
6240                 }               /* tailqforeachsafe (chk) */
6241         }                       /* if enabled in asoc */
6242 }
6243
6244 int
6245 sctp_get_frag_point(struct sctp_tcb *stcb,
6246     struct sctp_association *asoc)
6247 {
6248         int siz, ovh;
6249
6250         /*
6251          * For endpoints that have both v6 and v4 addresses we must reserve
6252          * room for the ipv6 header, for those that are only dealing with V4
6253          * we use a larger frag point.
6254          */
6255         if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
6256                 ovh = SCTP_MIN_OVERHEAD;
6257         } else {
6258                 ovh = SCTP_MIN_V4_OVERHEAD;
6259         }
6260         ovh += SCTP_DATA_CHUNK_OVERHEAD(stcb);
6261         if (stcb->asoc.sctp_frag_point > asoc->smallest_mtu)
6262                 siz = asoc->smallest_mtu - ovh;
6263         else
6264                 siz = (stcb->asoc.sctp_frag_point - ovh);
6265         /*
6266          * if (siz > (MCLBYTES-sizeof(struct sctp_data_chunk))) {
6267          */
6268         /* A data chunk MUST fit in a cluster */
6269         /* siz = (MCLBYTES - sizeof(struct sctp_data_chunk)); */
6270         /* } */
6271
6272         /* adjust for an AUTH chunk if DATA requires auth */
6273         if (sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks))
6274                 siz -= sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
6275
6276         if (siz % 4) {
6277                 /* make it an even word boundary please */
6278                 siz -= (siz % 4);
6279         }
6280         return (siz);
6281 }
6282
6283 static void
6284 sctp_set_prsctp_policy(struct sctp_stream_queue_pending *sp)
6285 {
6286         /*
6287          * We assume that the user wants PR_SCTP_TTL if the user provides a
6288          * positive lifetime but does not specify any PR_SCTP policy.
6289          */
6290         if (PR_SCTP_ENABLED(sp->sinfo_flags)) {
6291                 sp->act_flags |= PR_SCTP_POLICY(sp->sinfo_flags);
6292         } else if (sp->timetolive > 0) {
6293                 sp->sinfo_flags |= SCTP_PR_SCTP_TTL;
6294                 sp->act_flags |= PR_SCTP_POLICY(sp->sinfo_flags);
6295         } else {
6296                 return;
6297         }
6298         switch (PR_SCTP_POLICY(sp->sinfo_flags)) {
6299         case CHUNK_FLAGS_PR_SCTP_BUF:
6300                 /*
6301                  * Time to live is a priority stored in tv_sec when doing
6302                  * the buffer drop thing.
6303                  */
6304                 sp->ts.tv_sec = sp->timetolive;
6305                 sp->ts.tv_usec = 0;
6306                 break;
6307         case CHUNK_FLAGS_PR_SCTP_TTL:
6308                 {
6309                         struct timeval tv;
6310
6311                         (void)SCTP_GETTIME_TIMEVAL(&sp->ts);
6312                         tv.tv_sec = sp->timetolive / 1000;
6313                         tv.tv_usec = (sp->timetolive * 1000) % 1000000;
6314                         /*
6315                          * TODO sctp_constants.h needs alternative time
6316                          * macros when _KERNEL is undefined.
6317                          */
6318                         timevaladd(&sp->ts, &tv);
6319                 }
6320                 break;
6321         case CHUNK_FLAGS_PR_SCTP_RTX:
6322                 /*
6323                  * Time to live is a the number or retransmissions stored in
6324                  * tv_sec.
6325                  */
6326                 sp->ts.tv_sec = sp->timetolive;
6327                 sp->ts.tv_usec = 0;
6328                 break;
6329         default:
6330                 SCTPDBG(SCTP_DEBUG_USRREQ1,
6331                     "Unknown PR_SCTP policy %u.\n",
6332                     PR_SCTP_POLICY(sp->sinfo_flags));
6333                 break;
6334         }
6335 }
6336
6337 static int
6338 sctp_msg_append(struct sctp_tcb *stcb,
6339     struct sctp_nets *net,
6340     struct mbuf *m,
6341     struct sctp_sndrcvinfo *srcv, int hold_stcb_lock)
6342 {
6343         int error = 0;
6344         struct mbuf *at;
6345         struct sctp_stream_queue_pending *sp = NULL;
6346         struct sctp_stream_out *strm;
6347
6348         /*
6349          * Given an mbuf chain, put it into the association send queue and
6350          * place it on the wheel
6351          */
6352         if (srcv->sinfo_stream >= stcb->asoc.streamoutcnt) {
6353                 /* Invalid stream number */
6354                 SCTP_LTRACE_ERR_RET_PKT(m, NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
6355                 error = EINVAL;
6356                 goto out_now;
6357         }
6358         if ((stcb->asoc.stream_locked) &&
6359             (stcb->asoc.stream_locked_on != srcv->sinfo_stream)) {
6360                 SCTP_LTRACE_ERR_RET_PKT(m, NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
6361                 error = EINVAL;
6362                 goto out_now;
6363         }
6364         strm = &stcb->asoc.strmout[srcv->sinfo_stream];
6365         /* Now can we send this? */
6366         if ((SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_SENT) ||
6367             (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) ||
6368             (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_RECEIVED) ||
6369             (stcb->asoc.state & SCTP_STATE_SHUTDOWN_PENDING)) {
6370                 /* got data while shutting down */
6371                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
6372                 error = ECONNRESET;
6373                 goto out_now;
6374         }
6375         sctp_alloc_a_strmoq(stcb, sp);
6376         if (sp == NULL) {
6377                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
6378                 error = ENOMEM;
6379                 goto out_now;
6380         }
6381         sp->sinfo_flags = srcv->sinfo_flags;
6382         sp->timetolive = srcv->sinfo_timetolive;
6383         sp->ppid = srcv->sinfo_ppid;
6384         sp->context = srcv->sinfo_context;
6385         sp->fsn = 0;
6386         if (sp->sinfo_flags & SCTP_ADDR_OVER) {
6387                 sp->net = net;
6388                 atomic_add_int(&sp->net->ref_count, 1);
6389         } else {
6390                 sp->net = NULL;
6391         }
6392         (void)SCTP_GETTIME_TIMEVAL(&sp->ts);
6393         sp->sid = srcv->sinfo_stream;
6394         sp->msg_is_complete = 1;
6395         sp->sender_all_done = 1;
6396         sp->some_taken = 0;
6397         sp->data = m;
6398         sp->tail_mbuf = NULL;
6399         sctp_set_prsctp_policy(sp);
6400         /*
6401          * We could in theory (for sendall) sifa the length in, but we would
6402          * still have to hunt through the chain since we need to setup the
6403          * tail_mbuf
6404          */
6405         sp->length = 0;
6406         for (at = m; at; at = SCTP_BUF_NEXT(at)) {
6407                 if (SCTP_BUF_NEXT(at) == NULL)
6408                         sp->tail_mbuf = at;
6409                 sp->length += SCTP_BUF_LEN(at);
6410         }
6411         if (srcv->sinfo_keynumber_valid) {
6412                 sp->auth_keyid = srcv->sinfo_keynumber;
6413         } else {
6414                 sp->auth_keyid = stcb->asoc.authinfo.active_keyid;
6415         }
6416         if (sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks)) {
6417                 sctp_auth_key_acquire(stcb, sp->auth_keyid);
6418                 sp->holds_key_ref = 1;
6419         }
6420         if (hold_stcb_lock == 0) {
6421                 SCTP_TCB_SEND_LOCK(stcb);
6422         }
6423         sctp_snd_sb_alloc(stcb, sp->length);
6424         atomic_add_int(&stcb->asoc.stream_queue_cnt, 1);
6425         TAILQ_INSERT_TAIL(&strm->outqueue, sp, next);
6426         stcb->asoc.ss_functions.sctp_ss_add_to_stream(stcb, &stcb->asoc, strm, sp, 1);
6427         m = NULL;
6428         if (hold_stcb_lock == 0) {
6429                 SCTP_TCB_SEND_UNLOCK(stcb);
6430         }
6431 out_now:
6432         if (m) {
6433                 sctp_m_freem(m);
6434         }
6435         return (error);
6436 }
6437
6438
6439 static struct mbuf *
6440 sctp_copy_mbufchain(struct mbuf *clonechain,
6441     struct mbuf *outchain,
6442     struct mbuf **endofchain,
6443     int can_take_mbuf,
6444     int sizeofcpy,
6445     uint8_t copy_by_ref)
6446 {
6447         struct mbuf *m;
6448         struct mbuf *appendchain;
6449         caddr_t cp;
6450         int len;
6451
6452         if (endofchain == NULL) {
6453                 /* error */
6454 error_out:
6455                 if (outchain)
6456                         sctp_m_freem(outchain);
6457                 return (NULL);
6458         }
6459         if (can_take_mbuf) {
6460                 appendchain = clonechain;
6461         } else {
6462                 if (!copy_by_ref &&
6463                     (sizeofcpy <= (int)((((SCTP_BASE_SYSCTL(sctp_mbuf_threshold_count) - 1) * MLEN) + MHLEN)))
6464                     ) {
6465                         /* Its not in a cluster */
6466                         if (*endofchain == NULL) {
6467                                 /* lets get a mbuf cluster */
6468                                 if (outchain == NULL) {
6469                                         /* This is the general case */
6470                         new_mbuf:
6471                                         outchain = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_HEADER);
6472                                         if (outchain == NULL) {
6473                                                 goto error_out;
6474                                         }
6475                                         SCTP_BUF_LEN(outchain) = 0;
6476                                         *endofchain = outchain;
6477                                         /* get the prepend space */
6478                                         SCTP_BUF_RESV_UF(outchain, (SCTP_FIRST_MBUF_RESV + 4));
6479                                 } else {
6480                                         /*
6481                                          * We really should not get a NULL
6482                                          * in endofchain
6483                                          */
6484                                         /* find end */
6485                                         m = outchain;
6486                                         while (m) {
6487                                                 if (SCTP_BUF_NEXT(m) == NULL) {
6488                                                         *endofchain = m;
6489                                                         break;
6490                                                 }
6491                                                 m = SCTP_BUF_NEXT(m);
6492                                         }
6493                                         /* sanity */
6494                                         if (*endofchain == NULL) {
6495                                                 /*
6496                                                  * huh, TSNH XXX maybe we
6497                                                  * should panic
6498                                                  */
6499                                                 sctp_m_freem(outchain);
6500                                                 goto new_mbuf;
6501                                         }
6502                                 }
6503                                 /* get the new end of length */
6504                                 len = (int)M_TRAILINGSPACE(*endofchain);
6505                         } else {
6506                                 /* how much is left at the end? */
6507                                 len = (int)M_TRAILINGSPACE(*endofchain);
6508                         }
6509                         /* Find the end of the data, for appending */
6510                         cp = (mtod((*endofchain), caddr_t)+SCTP_BUF_LEN((*endofchain)));
6511
6512                         /* Now lets copy it out */
6513                         if (len >= sizeofcpy) {
6514                                 /* It all fits, copy it in */
6515                                 m_copydata(clonechain, 0, sizeofcpy, cp);
6516                                 SCTP_BUF_LEN((*endofchain)) += sizeofcpy;
6517                         } else {
6518                                 /* fill up the end of the chain */
6519                                 if (len > 0) {
6520                                         m_copydata(clonechain, 0, len, cp);
6521                                         SCTP_BUF_LEN((*endofchain)) += len;
6522                                         /* now we need another one */
6523                                         sizeofcpy -= len;
6524                                 }
6525                                 m = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_HEADER);
6526                                 if (m == NULL) {
6527                                         /* We failed */
6528                                         goto error_out;
6529                                 }
6530                                 SCTP_BUF_NEXT((*endofchain)) = m;
6531                                 *endofchain = m;
6532                                 cp = mtod((*endofchain), caddr_t);
6533                                 m_copydata(clonechain, len, sizeofcpy, cp);
6534                                 SCTP_BUF_LEN((*endofchain)) += sizeofcpy;
6535                         }
6536                         return (outchain);
6537                 } else {
6538                         /* copy the old fashion way */
6539                         appendchain = SCTP_M_COPYM(clonechain, 0, M_COPYALL, M_NOWAIT);
6540 #ifdef SCTP_MBUF_LOGGING
6541                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
6542                                 sctp_log_mbc(appendchain, SCTP_MBUF_ICOPY);
6543                         }
6544 #endif
6545                 }
6546         }
6547         if (appendchain == NULL) {
6548                 /* error */
6549                 if (outchain)
6550                         sctp_m_freem(outchain);
6551                 return (NULL);
6552         }
6553         if (outchain) {
6554                 /* tack on to the end */
6555                 if (*endofchain != NULL) {
6556                         SCTP_BUF_NEXT(((*endofchain))) = appendchain;
6557                 } else {
6558                         m = outchain;
6559                         while (m) {
6560                                 if (SCTP_BUF_NEXT(m) == NULL) {
6561                                         SCTP_BUF_NEXT(m) = appendchain;
6562                                         break;
6563                                 }
6564                                 m = SCTP_BUF_NEXT(m);
6565                         }
6566                 }
6567                 /*
6568                  * save off the end and update the end-chain position
6569                  */
6570                 m = appendchain;
6571                 while (m) {
6572                         if (SCTP_BUF_NEXT(m) == NULL) {
6573                                 *endofchain = m;
6574                                 break;
6575                         }
6576                         m = SCTP_BUF_NEXT(m);
6577                 }
6578                 return (outchain);
6579         } else {
6580                 /* save off the end and update the end-chain position */
6581                 m = appendchain;
6582                 while (m) {
6583                         if (SCTP_BUF_NEXT(m) == NULL) {
6584                                 *endofchain = m;
6585                                 break;
6586                         }
6587                         m = SCTP_BUF_NEXT(m);
6588                 }
6589                 return (appendchain);
6590         }
6591 }
6592
6593 static int
6594 sctp_med_chunk_output(struct sctp_inpcb *inp,
6595     struct sctp_tcb *stcb,
6596     struct sctp_association *asoc,
6597     int *num_out,
6598     int *reason_code,
6599     int control_only, int from_where,
6600     struct timeval *now, int *now_filled, int frag_point, int so_locked
6601 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
6602     SCTP_UNUSED
6603 #endif
6604 );
6605
6606 static void
6607 sctp_sendall_iterator(struct sctp_inpcb *inp, struct sctp_tcb *stcb, void *ptr,
6608     uint32_t val SCTP_UNUSED)
6609 {
6610         struct sctp_copy_all *ca;
6611         struct mbuf *m;
6612         int ret = 0;
6613         int added_control = 0;
6614         int un_sent, do_chunk_output = 1;
6615         struct sctp_association *asoc;
6616         struct sctp_nets *net;
6617
6618         ca = (struct sctp_copy_all *)ptr;
6619         if (ca->m == NULL) {
6620                 return;
6621         }
6622         if (ca->inp != inp) {
6623                 /* TSNH */
6624                 return;
6625         }
6626         if (ca->sndlen > 0) {
6627                 m = SCTP_M_COPYM(ca->m, 0, M_COPYALL, M_NOWAIT);
6628                 if (m == NULL) {
6629                         /* can't copy so we are done */
6630                         ca->cnt_failed++;
6631                         return;
6632                 }
6633 #ifdef SCTP_MBUF_LOGGING
6634                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
6635                         sctp_log_mbc(m, SCTP_MBUF_ICOPY);
6636                 }
6637 #endif
6638         } else {
6639                 m = NULL;
6640         }
6641         SCTP_TCB_LOCK_ASSERT(stcb);
6642         if (stcb->asoc.alternate) {
6643                 net = stcb->asoc.alternate;
6644         } else {
6645                 net = stcb->asoc.primary_destination;
6646         }
6647         if (ca->sndrcv.sinfo_flags & SCTP_ABORT) {
6648                 /* Abort this assoc with m as the user defined reason */
6649                 if (m != NULL) {
6650                         SCTP_BUF_PREPEND(m, sizeof(struct sctp_paramhdr), M_NOWAIT);
6651                 } else {
6652                         m = sctp_get_mbuf_for_msg(sizeof(struct sctp_paramhdr),
6653                             0, M_NOWAIT, 1, MT_DATA);
6654                         SCTP_BUF_LEN(m) = sizeof(struct sctp_paramhdr);
6655                 }
6656                 if (m != NULL) {
6657                         struct sctp_paramhdr *ph;
6658
6659                         ph = mtod(m, struct sctp_paramhdr *);
6660                         ph->param_type = htons(SCTP_CAUSE_USER_INITIATED_ABT);
6661                         ph->param_length = htons((uint16_t)(sizeof(struct sctp_paramhdr) + ca->sndlen));
6662                 }
6663                 /*
6664                  * We add one here to keep the assoc from dis-appearing on
6665                  * us.
6666                  */
6667                 atomic_add_int(&stcb->asoc.refcnt, 1);
6668                 sctp_abort_an_association(inp, stcb, m, SCTP_SO_NOT_LOCKED);
6669                 /*
6670                  * sctp_abort_an_association calls sctp_free_asoc() free
6671                  * association will NOT free it since we incremented the
6672                  * refcnt .. we do this to prevent it being freed and things
6673                  * getting tricky since we could end up (from free_asoc)
6674                  * calling inpcb_free which would get a recursive lock call
6675                  * to the iterator lock.. But as a consequence of that the
6676                  * stcb will return to us un-locked.. since free_asoc
6677                  * returns with either no TCB or the TCB unlocked, we must
6678                  * relock.. to unlock in the iterator timer :-0
6679                  */
6680                 SCTP_TCB_LOCK(stcb);
6681                 atomic_add_int(&stcb->asoc.refcnt, -1);
6682                 goto no_chunk_output;
6683         } else {
6684                 if (m) {
6685                         ret = sctp_msg_append(stcb, net, m,
6686                             &ca->sndrcv, 1);
6687                 }
6688                 asoc = &stcb->asoc;
6689                 if (ca->sndrcv.sinfo_flags & SCTP_EOF) {
6690                         /* shutdown this assoc */
6691                         if (TAILQ_EMPTY(&asoc->send_queue) &&
6692                             TAILQ_EMPTY(&asoc->sent_queue) &&
6693                             sctp_is_there_unsent_data(stcb, SCTP_SO_NOT_LOCKED) == 0) {
6694                                 if ((*asoc->ss_functions.sctp_ss_is_user_msgs_incomplete) (stcb, asoc)) {
6695                                         goto abort_anyway;
6696                                 }
6697                                 /*
6698                                  * there is nothing queued to send, so I'm
6699                                  * done...
6700                                  */
6701                                 if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) &&
6702                                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
6703                                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
6704                                         /*
6705                                          * only send SHUTDOWN the first time
6706                                          * through
6707                                          */
6708                                         if (SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) {
6709                                                 SCTP_STAT_DECR_GAUGE32(sctps_currestab);
6710                                         }
6711                                         SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_SENT);
6712                                         SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING);
6713                                         sctp_stop_timers_for_shutdown(stcb);
6714                                         sctp_send_shutdown(stcb, net);
6715                                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb,
6716                                             net);
6717                                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
6718                                             asoc->primary_destination);
6719                                         added_control = 1;
6720                                         do_chunk_output = 0;
6721                                 }
6722                         } else {
6723                                 /*
6724                                  * we still got (or just got) data to send,
6725                                  * so set SHUTDOWN_PENDING
6726                                  */
6727                                 /*
6728                                  * XXX sockets draft says that SCTP_EOF
6729                                  * should be sent with no data.  currently,
6730                                  * we will allow user data to be sent first
6731                                  * and move to SHUTDOWN-PENDING
6732                                  */
6733                                 if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) &&
6734                                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
6735                                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
6736                                         if ((*asoc->ss_functions.sctp_ss_is_user_msgs_incomplete) (stcb, asoc)) {
6737                                                 asoc->state |= SCTP_STATE_PARTIAL_MSG_LEFT;
6738                                         }
6739                                         asoc->state |= SCTP_STATE_SHUTDOWN_PENDING;
6740                                         if (TAILQ_EMPTY(&asoc->send_queue) &&
6741                                             TAILQ_EMPTY(&asoc->sent_queue) &&
6742                                             (asoc->state & SCTP_STATE_PARTIAL_MSG_LEFT)) {
6743                                                 struct mbuf *op_err;
6744                                                 char msg[SCTP_DIAG_INFO_LEN];
6745
6746                                 abort_anyway:
6747                                                 snprintf(msg, sizeof(msg),
6748                                                     "%s:%d at %s", __FILE__, __LINE__, __func__);
6749                                                 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
6750                                                     msg);
6751                                                 atomic_add_int(&stcb->asoc.refcnt, 1);
6752                                                 sctp_abort_an_association(stcb->sctp_ep, stcb,
6753                                                     op_err, SCTP_SO_NOT_LOCKED);
6754                                                 atomic_add_int(&stcb->asoc.refcnt, -1);
6755                                                 goto no_chunk_output;
6756                                         }
6757                                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
6758                                             asoc->primary_destination);
6759                                 }
6760                         }
6761
6762                 }
6763         }
6764         un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
6765             (stcb->asoc.stream_queue_cnt * SCTP_DATA_CHUNK_OVERHEAD(stcb)));
6766
6767         if ((sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY)) &&
6768             (stcb->asoc.total_flight > 0) &&
6769             (un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD))) {
6770                 do_chunk_output = 0;
6771         }
6772         if (do_chunk_output)
6773                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_NOT_LOCKED);
6774         else if (added_control) {
6775                 int num_out, reason, now_filled = 0;
6776                 struct timeval now;
6777                 int frag_point;
6778
6779                 frag_point = sctp_get_frag_point(stcb, &stcb->asoc);
6780                 (void)sctp_med_chunk_output(inp, stcb, &stcb->asoc, &num_out,
6781                     &reason, 1, 1, &now, &now_filled, frag_point, SCTP_SO_NOT_LOCKED);
6782         }
6783 no_chunk_output:
6784         if (ret) {
6785                 ca->cnt_failed++;
6786         } else {
6787                 ca->cnt_sent++;
6788         }
6789 }
6790
6791 static void
6792 sctp_sendall_completes(void *ptr, uint32_t val SCTP_UNUSED)
6793 {
6794         struct sctp_copy_all *ca;
6795
6796         ca = (struct sctp_copy_all *)ptr;
6797         /*
6798          * Do a notify here? Kacheong suggests that the notify be done at
6799          * the send time.. so you would push up a notification if any send
6800          * failed. Don't know if this is feasible since the only failures we
6801          * have is "memory" related and if you cannot get an mbuf to send
6802          * the data you surely can't get an mbuf to send up to notify the
6803          * user you can't send the data :->
6804          */
6805
6806         /* now free everything */
6807         sctp_m_freem(ca->m);
6808         SCTP_FREE(ca, SCTP_M_COPYAL);
6809 }
6810
6811 static struct mbuf *
6812 sctp_copy_out_all(struct uio *uio, int len)
6813 {
6814         struct mbuf *ret, *at;
6815         int left, willcpy, cancpy, error;
6816
6817         ret = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_WAITOK, 1, MT_DATA);
6818         if (ret == NULL) {
6819                 /* TSNH */
6820                 return (NULL);
6821         }
6822         left = len;
6823         SCTP_BUF_LEN(ret) = 0;
6824         /* save space for the data chunk header */
6825         cancpy = (int)M_TRAILINGSPACE(ret);
6826         willcpy = min(cancpy, left);
6827         at = ret;
6828         while (left > 0) {
6829                 /* Align data to the end */
6830                 error = uiomove(mtod(at, caddr_t), willcpy, uio);
6831                 if (error) {
6832         err_out_now:
6833                         sctp_m_freem(at);
6834                         return (NULL);
6835                 }
6836                 SCTP_BUF_LEN(at) = willcpy;
6837                 SCTP_BUF_NEXT_PKT(at) = SCTP_BUF_NEXT(at) = 0;
6838                 left -= willcpy;
6839                 if (left > 0) {
6840                         SCTP_BUF_NEXT(at) = sctp_get_mbuf_for_msg(left, 0, M_WAITOK, 1, MT_DATA);
6841                         if (SCTP_BUF_NEXT(at) == NULL) {
6842                                 goto err_out_now;
6843                         }
6844                         at = SCTP_BUF_NEXT(at);
6845                         SCTP_BUF_LEN(at) = 0;
6846                         cancpy = (int)M_TRAILINGSPACE(at);
6847                         willcpy = min(cancpy, left);
6848                 }
6849         }
6850         return (ret);
6851 }
6852
6853 static int
6854 sctp_sendall(struct sctp_inpcb *inp, struct uio *uio, struct mbuf *m,
6855     struct sctp_sndrcvinfo *srcv)
6856 {
6857         int ret;
6858         struct sctp_copy_all *ca;
6859
6860         SCTP_MALLOC(ca, struct sctp_copy_all *, sizeof(struct sctp_copy_all),
6861             SCTP_M_COPYAL);
6862         if (ca == NULL) {
6863                 sctp_m_freem(m);
6864                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
6865                 return (ENOMEM);
6866         }
6867         memset(ca, 0, sizeof(struct sctp_copy_all));
6868
6869         ca->inp = inp;
6870         if (srcv) {
6871                 memcpy(&ca->sndrcv, srcv, sizeof(struct sctp_nonpad_sndrcvinfo));
6872         }
6873         /*
6874          * take off the sendall flag, it would be bad if we failed to do
6875          * this :-0
6876          */
6877         ca->sndrcv.sinfo_flags &= ~SCTP_SENDALL;
6878         /* get length and mbuf chain */
6879         if (uio) {
6880                 ca->sndlen = (int)uio->uio_resid;
6881                 ca->m = sctp_copy_out_all(uio, ca->sndlen);
6882                 if (ca->m == NULL) {
6883                         SCTP_FREE(ca, SCTP_M_COPYAL);
6884                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
6885                         return (ENOMEM);
6886                 }
6887         } else {
6888                 /* Gather the length of the send */
6889                 struct mbuf *mat;
6890
6891                 ca->sndlen = 0;
6892                 for (mat = m; mat; mat = SCTP_BUF_NEXT(mat)) {
6893                         ca->sndlen += SCTP_BUF_LEN(mat);
6894                 }
6895         }
6896         ret = sctp_initiate_iterator(NULL, sctp_sendall_iterator, NULL,
6897             SCTP_PCB_ANY_FLAGS, SCTP_PCB_ANY_FEATURES,
6898             SCTP_ASOC_ANY_STATE,
6899             (void *)ca, 0,
6900             sctp_sendall_completes, inp, 1);
6901         if (ret) {
6902                 SCTP_PRINTF("Failed to initiate iterator for sendall\n");
6903                 SCTP_FREE(ca, SCTP_M_COPYAL);
6904                 SCTP_LTRACE_ERR_RET_PKT(m, inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EFAULT);
6905                 return (EFAULT);
6906         }
6907         return (0);
6908 }
6909
6910
6911 void
6912 sctp_toss_old_cookies(struct sctp_tcb *stcb, struct sctp_association *asoc)
6913 {
6914         struct sctp_tmit_chunk *chk, *nchk;
6915
6916         TAILQ_FOREACH_SAFE(chk, &asoc->control_send_queue, sctp_next, nchk) {
6917                 if (chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
6918                         TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
6919                         asoc->ctrl_queue_cnt--;
6920                         if (chk->data) {
6921                                 sctp_m_freem(chk->data);
6922                                 chk->data = NULL;
6923                         }
6924                         sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
6925                 }
6926         }
6927 }
6928
6929 void
6930 sctp_toss_old_asconf(struct sctp_tcb *stcb)
6931 {
6932         struct sctp_association *asoc;
6933         struct sctp_tmit_chunk *chk, *nchk;
6934         struct sctp_asconf_chunk *acp;
6935
6936         asoc = &stcb->asoc;
6937         TAILQ_FOREACH_SAFE(chk, &asoc->asconf_send_queue, sctp_next, nchk) {
6938                 /* find SCTP_ASCONF chunk in queue */
6939                 if (chk->rec.chunk_id.id == SCTP_ASCONF) {
6940                         if (chk->data) {
6941                                 acp = mtod(chk->data, struct sctp_asconf_chunk *);
6942                                 if (SCTP_TSN_GT(ntohl(acp->serial_number), asoc->asconf_seq_out_acked)) {
6943                                         /* Not Acked yet */
6944                                         break;
6945                                 }
6946                         }
6947                         TAILQ_REMOVE(&asoc->asconf_send_queue, chk, sctp_next);
6948                         asoc->ctrl_queue_cnt--;
6949                         if (chk->data) {
6950                                 sctp_m_freem(chk->data);
6951                                 chk->data = NULL;
6952                         }
6953                         sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
6954                 }
6955         }
6956 }
6957
6958
6959 static void
6960 sctp_clean_up_datalist(struct sctp_tcb *stcb,
6961     struct sctp_association *asoc,
6962     struct sctp_tmit_chunk **data_list,
6963     int bundle_at,
6964     struct sctp_nets *net)
6965 {
6966         int i;
6967         struct sctp_tmit_chunk *tp1;
6968
6969         for (i = 0; i < bundle_at; i++) {
6970                 /* off of the send queue */
6971                 TAILQ_REMOVE(&asoc->send_queue, data_list[i], sctp_next);
6972                 asoc->send_queue_cnt--;
6973                 if (i > 0) {
6974                         /*
6975                          * Any chunk NOT 0 you zap the time chunk 0 gets
6976                          * zapped or set based on if a RTO measurment is
6977                          * needed.
6978                          */
6979                         data_list[i]->do_rtt = 0;
6980                 }
6981                 /* record time */
6982                 data_list[i]->sent_rcv_time = net->last_sent_time;
6983                 data_list[i]->rec.data.cwnd_at_send = net->cwnd;
6984                 data_list[i]->rec.data.fast_retran_tsn = data_list[i]->rec.data.tsn;
6985                 if (data_list[i]->whoTo == NULL) {
6986                         data_list[i]->whoTo = net;
6987                         atomic_add_int(&net->ref_count, 1);
6988                 }
6989                 /* on to the sent queue */
6990                 tp1 = TAILQ_LAST(&asoc->sent_queue, sctpchunk_listhead);
6991                 if ((tp1) && SCTP_TSN_GT(tp1->rec.data.tsn, data_list[i]->rec.data.tsn)) {
6992                         struct sctp_tmit_chunk *tpp;
6993
6994                         /* need to move back */
6995         back_up_more:
6996                         tpp = TAILQ_PREV(tp1, sctpchunk_listhead, sctp_next);
6997                         if (tpp == NULL) {
6998                                 TAILQ_INSERT_BEFORE(tp1, data_list[i], sctp_next);
6999                                 goto all_done;
7000                         }
7001                         tp1 = tpp;
7002                         if (SCTP_TSN_GT(tp1->rec.data.tsn, data_list[i]->rec.data.tsn)) {
7003                                 goto back_up_more;
7004                         }
7005                         TAILQ_INSERT_AFTER(&asoc->sent_queue, tp1, data_list[i], sctp_next);
7006                 } else {
7007                         TAILQ_INSERT_TAIL(&asoc->sent_queue,
7008                             data_list[i],
7009                             sctp_next);
7010                 }
7011 all_done:
7012                 /* This does not lower until the cum-ack passes it */
7013                 asoc->sent_queue_cnt++;
7014                 if ((asoc->peers_rwnd <= 0) &&
7015                     (asoc->total_flight == 0) &&
7016                     (bundle_at == 1)) {
7017                         /* Mark the chunk as being a window probe */
7018                         SCTP_STAT_INCR(sctps_windowprobed);
7019                 }
7020 #ifdef SCTP_AUDITING_ENABLED
7021                 sctp_audit_log(0xC2, 3);
7022 #endif
7023                 data_list[i]->sent = SCTP_DATAGRAM_SENT;
7024                 data_list[i]->snd_count = 1;
7025                 data_list[i]->rec.data.chunk_was_revoked = 0;
7026                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
7027                         sctp_misc_ints(SCTP_FLIGHT_LOG_UP,
7028                             data_list[i]->whoTo->flight_size,
7029                             data_list[i]->book_size,
7030                             (uint32_t)(uintptr_t)data_list[i]->whoTo,
7031                             data_list[i]->rec.data.tsn);
7032                 }
7033                 sctp_flight_size_increase(data_list[i]);
7034                 sctp_total_flight_increase(stcb, data_list[i]);
7035                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_RWND_ENABLE) {
7036                         sctp_log_rwnd(SCTP_DECREASE_PEER_RWND,
7037                             asoc->peers_rwnd, data_list[i]->send_size, SCTP_BASE_SYSCTL(sctp_peer_chunk_oh));
7038                 }
7039                 asoc->peers_rwnd = sctp_sbspace_sub(asoc->peers_rwnd,
7040                     (uint32_t)(data_list[i]->send_size + SCTP_BASE_SYSCTL(sctp_peer_chunk_oh)));
7041                 if (asoc->peers_rwnd < stcb->sctp_ep->sctp_ep.sctp_sws_sender) {
7042                         /* SWS sender side engages */
7043                         asoc->peers_rwnd = 0;
7044                 }
7045         }
7046         if (asoc->cc_functions.sctp_cwnd_update_packet_transmitted) {
7047                 (*asoc->cc_functions.sctp_cwnd_update_packet_transmitted) (stcb, net);
7048         }
7049 }
7050
7051 static void
7052 sctp_clean_up_ctl(struct sctp_tcb *stcb, struct sctp_association *asoc, int so_locked
7053 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
7054     SCTP_UNUSED
7055 #endif
7056 )
7057 {
7058         struct sctp_tmit_chunk *chk, *nchk;
7059
7060         TAILQ_FOREACH_SAFE(chk, &asoc->control_send_queue, sctp_next, nchk) {
7061                 if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
7062                     (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK) ||  /* EY */
7063                     (chk->rec.chunk_id.id == SCTP_HEARTBEAT_REQUEST) ||
7064                     (chk->rec.chunk_id.id == SCTP_HEARTBEAT_ACK) ||
7065                     (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN) ||
7066                     (chk->rec.chunk_id.id == SCTP_SHUTDOWN) ||
7067                     (chk->rec.chunk_id.id == SCTP_SHUTDOWN_ACK) ||
7068                     (chk->rec.chunk_id.id == SCTP_OPERATION_ERROR) ||
7069                     (chk->rec.chunk_id.id == SCTP_PACKET_DROPPED) ||
7070                     (chk->rec.chunk_id.id == SCTP_COOKIE_ACK) ||
7071                     (chk->rec.chunk_id.id == SCTP_ECN_CWR) ||
7072                     (chk->rec.chunk_id.id == SCTP_ASCONF_ACK)) {
7073                         /* Stray chunks must be cleaned up */
7074         clean_up_anyway:
7075                         TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
7076                         asoc->ctrl_queue_cnt--;
7077                         if (chk->data) {
7078                                 sctp_m_freem(chk->data);
7079                                 chk->data = NULL;
7080                         }
7081                         if (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN) {
7082                                 asoc->fwd_tsn_cnt--;
7083                         }
7084                         sctp_free_a_chunk(stcb, chk, so_locked);
7085                 } else if (chk->rec.chunk_id.id == SCTP_STREAM_RESET) {
7086                         /* special handling, we must look into the param */
7087                         if (chk != asoc->str_reset) {
7088                                 goto clean_up_anyway;
7089                         }
7090                 }
7091         }
7092 }
7093
7094 static uint32_t
7095 sctp_can_we_split_this(struct sctp_tcb *stcb, uint32_t length,
7096     uint32_t space_left, uint32_t frag_point, int eeor_on)
7097 {
7098         /*
7099          * Make a decision on if I should split a msg into multiple parts.
7100          * This is only asked of incomplete messages.
7101          */
7102         if (eeor_on) {
7103                 /*
7104                  * If we are doing EEOR we need to always send it if its the
7105                  * entire thing, since it might be all the guy is putting in
7106                  * the hopper.
7107                  */
7108                 if (space_left >= length) {
7109                         /*-
7110                          * If we have data outstanding,
7111                          * we get another chance when the sack
7112                          * arrives to transmit - wait for more data
7113                          */
7114                         if (stcb->asoc.total_flight == 0) {
7115                                 /*
7116                                  * If nothing is in flight, we zero the
7117                                  * packet counter.
7118                                  */
7119                                 return (length);
7120                         }
7121                         return (0);
7122
7123                 } else {
7124                         /* You can fill the rest */
7125                         return (space_left);
7126                 }
7127         }
7128         /*-
7129          * For those strange folk that make the send buffer
7130          * smaller than our fragmentation point, we can't
7131          * get a full msg in so we have to allow splitting.
7132          */
7133         if (SCTP_SB_LIMIT_SND(stcb->sctp_socket) < frag_point) {
7134                 return (length);
7135         }
7136         if ((length <= space_left) ||
7137             ((length - space_left) < SCTP_BASE_SYSCTL(sctp_min_residual))) {
7138                 /* Sub-optimial residual don't split in non-eeor mode. */
7139                 return (0);
7140         }
7141         /*
7142          * If we reach here length is larger than the space_left. Do we wish
7143          * to split it for the sake of packet putting together?
7144          */
7145         if (space_left >= min(SCTP_BASE_SYSCTL(sctp_min_split_point), frag_point)) {
7146                 /* Its ok to split it */
7147                 return (min(space_left, frag_point));
7148         }
7149         /* Nope, can't split */
7150         return (0);
7151 }
7152
7153 static uint32_t
7154 sctp_move_to_outqueue(struct sctp_tcb *stcb,
7155     struct sctp_stream_out *strq,
7156     uint32_t space_left,
7157     uint32_t frag_point,
7158     int *giveup,
7159     int eeor_mode,
7160     int *bail,
7161     int so_locked
7162 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
7163     SCTP_UNUSED
7164 #endif
7165 )
7166 {
7167         /* Move from the stream to the send_queue keeping track of the total */
7168         struct sctp_association *asoc;
7169         struct sctp_stream_queue_pending *sp;
7170         struct sctp_tmit_chunk *chk;
7171         struct sctp_data_chunk *dchkh = NULL;
7172         struct sctp_idata_chunk *ndchkh = NULL;
7173         uint32_t to_move, length;
7174         int leading;
7175         uint8_t rcv_flags = 0;
7176         uint8_t some_taken;
7177         uint8_t send_lock_up = 0;
7178
7179         SCTP_TCB_LOCK_ASSERT(stcb);
7180         asoc = &stcb->asoc;
7181 one_more_time:
7182         /* sa_ignore FREED_MEMORY */
7183         sp = TAILQ_FIRST(&strq->outqueue);
7184         if (sp == NULL) {
7185                 if (send_lock_up == 0) {
7186                         SCTP_TCB_SEND_LOCK(stcb);
7187                         send_lock_up = 1;
7188                 }
7189                 sp = TAILQ_FIRST(&strq->outqueue);
7190                 if (sp) {
7191                         goto one_more_time;
7192                 }
7193                 if ((sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_EXPLICIT_EOR) == 0) &&
7194                     (stcb->asoc.idata_supported == 0) &&
7195                     (strq->last_msg_incomplete)) {
7196                         SCTP_PRINTF("Huh? Stream:%d lm_in_c=%d but queue is NULL\n",
7197                             strq->sid,
7198                             strq->last_msg_incomplete);
7199                         strq->last_msg_incomplete = 0;
7200                 }
7201                 to_move = 0;
7202                 if (send_lock_up) {
7203                         SCTP_TCB_SEND_UNLOCK(stcb);
7204                         send_lock_up = 0;
7205                 }
7206                 goto out_of;
7207         }
7208         if ((sp->msg_is_complete) && (sp->length == 0)) {
7209                 if (sp->sender_all_done) {
7210                         /*
7211                          * We are doing differed cleanup. Last time through
7212                          * when we took all the data the sender_all_done was
7213                          * not set.
7214                          */
7215                         if ((sp->put_last_out == 0) && (sp->discard_rest == 0)) {
7216                                 SCTP_PRINTF("Gak, put out entire msg with NO end!-1\n");
7217                                 SCTP_PRINTF("sender_done:%d len:%d msg_comp:%d put_last_out:%d send_lock:%d\n",
7218                                     sp->sender_all_done,
7219                                     sp->length,
7220                                     sp->msg_is_complete,
7221                                     sp->put_last_out,
7222                                     send_lock_up);
7223                         }
7224                         if ((TAILQ_NEXT(sp, next) == NULL) && (send_lock_up == 0)) {
7225                                 SCTP_TCB_SEND_LOCK(stcb);
7226                                 send_lock_up = 1;
7227                         }
7228                         atomic_subtract_int(&asoc->stream_queue_cnt, 1);
7229                         TAILQ_REMOVE(&strq->outqueue, sp, next);
7230                         stcb->asoc.ss_functions.sctp_ss_remove_from_stream(stcb, asoc, strq, sp, send_lock_up);
7231                         if ((strq->state == SCTP_STREAM_RESET_PENDING) &&
7232                             (strq->chunks_on_queues == 0) &&
7233                             TAILQ_EMPTY(&strq->outqueue)) {
7234                                 stcb->asoc.trigger_reset = 1;
7235                         }
7236                         if (sp->net) {
7237                                 sctp_free_remote_addr(sp->net);
7238                                 sp->net = NULL;
7239                         }
7240                         if (sp->data) {
7241                                 sctp_m_freem(sp->data);
7242                                 sp->data = NULL;
7243                         }
7244                         sctp_free_a_strmoq(stcb, sp, so_locked);
7245                         /* we can't be locked to it */
7246                         if (send_lock_up) {
7247                                 SCTP_TCB_SEND_UNLOCK(stcb);
7248                                 send_lock_up = 0;
7249                         }
7250                         /* back to get the next msg */
7251                         goto one_more_time;
7252                 } else {
7253                         /*
7254                          * sender just finished this but still holds a
7255                          * reference
7256                          */
7257                         *giveup = 1;
7258                         to_move = 0;
7259                         goto out_of;
7260                 }
7261         } else {
7262                 /* is there some to get */
7263                 if (sp->length == 0) {
7264                         /* no */
7265                         *giveup = 1;
7266                         to_move = 0;
7267                         goto out_of;
7268                 } else if (sp->discard_rest) {
7269                         if (send_lock_up == 0) {
7270                                 SCTP_TCB_SEND_LOCK(stcb);
7271                                 send_lock_up = 1;
7272                         }
7273                         /* Whack down the size */
7274                         atomic_subtract_int(&stcb->asoc.total_output_queue_size, sp->length);
7275                         if ((stcb->sctp_socket != NULL) &&
7276                             ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
7277                             (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL))) {
7278                                 atomic_subtract_int(&stcb->sctp_socket->so_snd.sb_cc, sp->length);
7279                         }
7280                         if (sp->data) {
7281                                 sctp_m_freem(sp->data);
7282                                 sp->data = NULL;
7283                                 sp->tail_mbuf = NULL;
7284                         }
7285                         sp->length = 0;
7286                         sp->some_taken = 1;
7287                         *giveup = 1;
7288                         to_move = 0;
7289                         goto out_of;
7290                 }
7291         }
7292         some_taken = sp->some_taken;
7293 re_look:
7294         length = sp->length;
7295         if (sp->msg_is_complete) {
7296                 /* The message is complete */
7297                 to_move = min(length, frag_point);
7298                 if (to_move == length) {
7299                         /* All of it fits in the MTU */
7300                         if (sp->some_taken) {
7301                                 rcv_flags |= SCTP_DATA_LAST_FRAG;
7302                         } else {
7303                                 rcv_flags |= SCTP_DATA_NOT_FRAG;
7304                         }
7305                         sp->put_last_out = 1;
7306                         if (sp->sinfo_flags & SCTP_SACK_IMMEDIATELY) {
7307                                 rcv_flags |= SCTP_DATA_SACK_IMMEDIATELY;
7308                         }
7309                 } else {
7310                         /* Not all of it fits, we fragment */
7311                         if (sp->some_taken == 0) {
7312                                 rcv_flags |= SCTP_DATA_FIRST_FRAG;
7313                         }
7314                         sp->some_taken = 1;
7315                 }
7316         } else {
7317                 to_move = sctp_can_we_split_this(stcb, length, space_left, frag_point, eeor_mode);
7318                 if (to_move) {
7319                         /*-
7320                          * We use a snapshot of length in case it
7321                          * is expanding during the compare.
7322                          */
7323                         uint32_t llen;
7324
7325                         llen = length;
7326                         if (to_move >= llen) {
7327                                 to_move = llen;
7328                                 if (send_lock_up == 0) {
7329                                         /*-
7330                                          * We are taking all of an incomplete msg
7331                                          * thus we need a send lock.
7332                                          */
7333                                         SCTP_TCB_SEND_LOCK(stcb);
7334                                         send_lock_up = 1;
7335                                         if (sp->msg_is_complete) {
7336                                                 /*
7337                                                  * the sender finished the
7338                                                  * msg
7339                                                  */
7340                                                 goto re_look;
7341                                         }
7342                                 }
7343                         }
7344                         if (sp->some_taken == 0) {
7345                                 rcv_flags |= SCTP_DATA_FIRST_FRAG;
7346                                 sp->some_taken = 1;
7347                         }
7348                 } else {
7349                         /* Nothing to take. */
7350                         *giveup = 1;
7351                         to_move = 0;
7352                         goto out_of;
7353                 }
7354         }
7355
7356         /* If we reach here, we can copy out a chunk */
7357         sctp_alloc_a_chunk(stcb, chk);
7358         if (chk == NULL) {
7359                 /* No chunk memory */
7360                 *giveup = 1;
7361                 to_move = 0;
7362                 goto out_of;
7363         }
7364         /*
7365          * Setup for unordered if needed by looking at the user sent info
7366          * flags.
7367          */
7368         if (sp->sinfo_flags & SCTP_UNORDERED) {
7369                 rcv_flags |= SCTP_DATA_UNORDERED;
7370         }
7371         if (SCTP_BASE_SYSCTL(sctp_enable_sack_immediately) &&
7372             (sp->sinfo_flags & SCTP_EOF) == SCTP_EOF) {
7373                 rcv_flags |= SCTP_DATA_SACK_IMMEDIATELY;
7374         }
7375         /* clear out the chunk before setting up */
7376         memset(chk, 0, sizeof(*chk));
7377         chk->rec.data.rcv_flags = rcv_flags;
7378
7379         if (to_move >= length) {
7380                 /* we think we can steal the whole thing */
7381                 if ((sp->sender_all_done == 0) && (send_lock_up == 0)) {
7382                         SCTP_TCB_SEND_LOCK(stcb);
7383                         send_lock_up = 1;
7384                 }
7385                 if (to_move < sp->length) {
7386                         /* bail, it changed */
7387                         goto dont_do_it;
7388                 }
7389                 chk->data = sp->data;
7390                 chk->last_mbuf = sp->tail_mbuf;
7391                 /* register the stealing */
7392                 sp->data = sp->tail_mbuf = NULL;
7393         } else {
7394                 struct mbuf *m;
7395
7396 dont_do_it:
7397                 chk->data = SCTP_M_COPYM(sp->data, 0, to_move, M_NOWAIT);
7398                 chk->last_mbuf = NULL;
7399                 if (chk->data == NULL) {
7400                         sp->some_taken = some_taken;
7401                         sctp_free_a_chunk(stcb, chk, so_locked);
7402                         *bail = 1;
7403                         to_move = 0;
7404                         goto out_of;
7405                 }
7406 #ifdef SCTP_MBUF_LOGGING
7407                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
7408                         sctp_log_mbc(chk->data, SCTP_MBUF_ICOPY);
7409                 }
7410 #endif
7411                 /* Pull off the data */
7412                 m_adj(sp->data, to_move);
7413                 /* Now lets work our way down and compact it */
7414                 m = sp->data;
7415                 while (m && (SCTP_BUF_LEN(m) == 0)) {
7416                         sp->data = SCTP_BUF_NEXT(m);
7417                         SCTP_BUF_NEXT(m) = NULL;
7418                         if (sp->tail_mbuf == m) {
7419                                 /*-
7420                                  * Freeing tail? TSNH since
7421                                  * we supposedly were taking less
7422                                  * than the sp->length.
7423                                  */
7424 #ifdef INVARIANTS
7425                                 panic("Huh, freing tail? - TSNH");
7426 #else
7427                                 SCTP_PRINTF("Huh, freeing tail? - TSNH\n");
7428                                 sp->tail_mbuf = sp->data = NULL;
7429                                 sp->length = 0;
7430 #endif
7431
7432                         }
7433                         sctp_m_free(m);
7434                         m = sp->data;
7435                 }
7436         }
7437         if (SCTP_BUF_IS_EXTENDED(chk->data)) {
7438                 chk->copy_by_ref = 1;
7439         } else {
7440                 chk->copy_by_ref = 0;
7441         }
7442         /*
7443          * get last_mbuf and counts of mb usage This is ugly but hopefully
7444          * its only one mbuf.
7445          */
7446         if (chk->last_mbuf == NULL) {
7447                 chk->last_mbuf = chk->data;
7448                 while (SCTP_BUF_NEXT(chk->last_mbuf) != NULL) {
7449                         chk->last_mbuf = SCTP_BUF_NEXT(chk->last_mbuf);
7450                 }
7451         }
7452
7453         if (to_move > length) {
7454                 /*- This should not happen either
7455                  * since we always lower to_move to the size
7456                  * of sp->length if its larger.
7457                  */
7458 #ifdef INVARIANTS
7459                 panic("Huh, how can to_move be larger?");
7460 #else
7461                 SCTP_PRINTF("Huh, how can to_move be larger?\n");
7462                 sp->length = 0;
7463 #endif
7464         } else {
7465                 atomic_subtract_int(&sp->length, to_move);
7466         }
7467         leading = SCTP_DATA_CHUNK_OVERHEAD(stcb);
7468         if (M_LEADINGSPACE(chk->data) < leading) {
7469                 /* Not enough room for a chunk header, get some */
7470                 struct mbuf *m;
7471
7472                 m = sctp_get_mbuf_for_msg(1, 0, M_NOWAIT, 1, MT_DATA);
7473                 if (m == NULL) {
7474                         /*
7475                          * we're in trouble here. _PREPEND below will free
7476                          * all the data if there is no leading space, so we
7477                          * must put the data back and restore.
7478                          */
7479                         if (send_lock_up == 0) {
7480                                 SCTP_TCB_SEND_LOCK(stcb);
7481                                 send_lock_up = 1;
7482                         }
7483                         if (sp->data == NULL) {
7484                                 /* unsteal the data */
7485                                 sp->data = chk->data;
7486                                 sp->tail_mbuf = chk->last_mbuf;
7487                         } else {
7488                                 struct mbuf *m_tmp;
7489
7490                                 /* reassemble the data */
7491                                 m_tmp = sp->data;
7492                                 sp->data = chk->data;
7493                                 SCTP_BUF_NEXT(chk->last_mbuf) = m_tmp;
7494                         }
7495                         sp->some_taken = some_taken;
7496                         atomic_add_int(&sp->length, to_move);
7497                         chk->data = NULL;
7498                         *bail = 1;
7499                         sctp_free_a_chunk(stcb, chk, so_locked);
7500                         to_move = 0;
7501                         goto out_of;
7502                 } else {
7503                         SCTP_BUF_LEN(m) = 0;
7504                         SCTP_BUF_NEXT(m) = chk->data;
7505                         chk->data = m;
7506                         M_ALIGN(chk->data, 4);
7507                 }
7508         }
7509         SCTP_BUF_PREPEND(chk->data, SCTP_DATA_CHUNK_OVERHEAD(stcb), M_NOWAIT);
7510         if (chk->data == NULL) {
7511                 /* HELP, TSNH since we assured it would not above? */
7512 #ifdef INVARIANTS
7513                 panic("prepend failes HELP?");
7514 #else
7515                 SCTP_PRINTF("prepend fails HELP?\n");
7516                 sctp_free_a_chunk(stcb, chk, so_locked);
7517 #endif
7518                 *bail = 1;
7519                 to_move = 0;
7520                 goto out_of;
7521         }
7522         sctp_snd_sb_alloc(stcb, SCTP_DATA_CHUNK_OVERHEAD(stcb));
7523         chk->book_size = chk->send_size = (uint16_t)(to_move + SCTP_DATA_CHUNK_OVERHEAD(stcb));
7524         chk->book_size_scale = 0;
7525         chk->sent = SCTP_DATAGRAM_UNSENT;
7526
7527         chk->flags = 0;
7528         chk->asoc = &stcb->asoc;
7529         chk->pad_inplace = 0;
7530         chk->no_fr_allowed = 0;
7531         if (stcb->asoc.idata_supported == 0) {
7532                 if (rcv_flags & SCTP_DATA_UNORDERED) {
7533                         /* Just use 0. The receiver ignores the values. */
7534                         chk->rec.data.mid = 0;
7535                 } else {
7536                         chk->rec.data.mid = strq->next_mid_ordered;
7537                         if (rcv_flags & SCTP_DATA_LAST_FRAG) {
7538                                 strq->next_mid_ordered++;
7539                         }
7540                 }
7541         } else {
7542                 if (rcv_flags & SCTP_DATA_UNORDERED) {
7543                         chk->rec.data.mid = strq->next_mid_unordered;
7544                         if (rcv_flags & SCTP_DATA_LAST_FRAG) {
7545                                 strq->next_mid_unordered++;
7546                         }
7547                 } else {
7548                         chk->rec.data.mid = strq->next_mid_ordered;
7549                         if (rcv_flags & SCTP_DATA_LAST_FRAG) {
7550                                 strq->next_mid_ordered++;
7551                         }
7552                 }
7553         }
7554         chk->rec.data.sid = sp->sid;
7555         chk->rec.data.ppid = sp->ppid;
7556         chk->rec.data.context = sp->context;
7557         chk->rec.data.doing_fast_retransmit = 0;
7558
7559         chk->rec.data.timetodrop = sp->ts;
7560         chk->flags = sp->act_flags;
7561
7562         if (sp->net) {
7563                 chk->whoTo = sp->net;
7564                 atomic_add_int(&chk->whoTo->ref_count, 1);
7565         } else
7566                 chk->whoTo = NULL;
7567
7568         if (sp->holds_key_ref) {
7569                 chk->auth_keyid = sp->auth_keyid;
7570                 sctp_auth_key_acquire(stcb, chk->auth_keyid);
7571                 chk->holds_key_ref = 1;
7572         }
7573         chk->rec.data.tsn = atomic_fetchadd_int(&asoc->sending_seq, 1);
7574         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_AT_SEND_2_OUTQ) {
7575                 sctp_misc_ints(SCTP_STRMOUT_LOG_SEND,
7576                     (uint32_t)(uintptr_t)stcb, sp->length,
7577                     (uint32_t)((chk->rec.data.sid << 16) | (0x0000ffff & chk->rec.data.mid)),
7578                     chk->rec.data.tsn);
7579         }
7580         if (stcb->asoc.idata_supported == 0) {
7581                 dchkh = mtod(chk->data, struct sctp_data_chunk *);
7582         } else {
7583                 ndchkh = mtod(chk->data, struct sctp_idata_chunk *);
7584         }
7585         /*
7586          * Put the rest of the things in place now. Size was done earlier in
7587          * previous loop prior to padding.
7588          */
7589
7590 #ifdef SCTP_ASOCLOG_OF_TSNS
7591         SCTP_TCB_LOCK_ASSERT(stcb);
7592         if (asoc->tsn_out_at >= SCTP_TSN_LOG_SIZE) {
7593                 asoc->tsn_out_at = 0;
7594                 asoc->tsn_out_wrapped = 1;
7595         }
7596         asoc->out_tsnlog[asoc->tsn_out_at].tsn = chk->rec.data.tsn;
7597         asoc->out_tsnlog[asoc->tsn_out_at].strm = chk->rec.data.sid;
7598         asoc->out_tsnlog[asoc->tsn_out_at].seq = chk->rec.data.mid;
7599         asoc->out_tsnlog[asoc->tsn_out_at].sz = chk->send_size;
7600         asoc->out_tsnlog[asoc->tsn_out_at].flgs = chk->rec.data.rcv_flags;
7601         asoc->out_tsnlog[asoc->tsn_out_at].stcb = (void *)stcb;
7602         asoc->out_tsnlog[asoc->tsn_out_at].in_pos = asoc->tsn_out_at;
7603         asoc->out_tsnlog[asoc->tsn_out_at].in_out = 2;
7604         asoc->tsn_out_at++;
7605 #endif
7606         if (stcb->asoc.idata_supported == 0) {
7607                 dchkh->ch.chunk_type = SCTP_DATA;
7608                 dchkh->ch.chunk_flags = chk->rec.data.rcv_flags;
7609                 dchkh->dp.tsn = htonl(chk->rec.data.tsn);
7610                 dchkh->dp.sid = htons(strq->sid);
7611                 dchkh->dp.ssn = htons((uint16_t)chk->rec.data.mid);
7612                 dchkh->dp.ppid = chk->rec.data.ppid;
7613                 dchkh->ch.chunk_length = htons(chk->send_size);
7614         } else {
7615                 ndchkh->ch.chunk_type = SCTP_IDATA;
7616                 ndchkh->ch.chunk_flags = chk->rec.data.rcv_flags;
7617                 ndchkh->dp.tsn = htonl(chk->rec.data.tsn);
7618                 ndchkh->dp.sid = htons(strq->sid);
7619                 ndchkh->dp.reserved = htons(0);
7620                 ndchkh->dp.mid = htonl(chk->rec.data.mid);
7621                 if (sp->fsn == 0)
7622                         ndchkh->dp.ppid_fsn.ppid = chk->rec.data.ppid;
7623                 else
7624                         ndchkh->dp.ppid_fsn.fsn = htonl(sp->fsn);
7625                 sp->fsn++;
7626                 ndchkh->ch.chunk_length = htons(chk->send_size);
7627         }
7628         /* Now advance the chk->send_size by the actual pad needed. */
7629         if (chk->send_size < SCTP_SIZE32(chk->book_size)) {
7630                 /* need a pad */
7631                 struct mbuf *lm;
7632                 int pads;
7633
7634                 pads = SCTP_SIZE32(chk->book_size) - chk->send_size;
7635                 lm = sctp_pad_lastmbuf(chk->data, pads, chk->last_mbuf);
7636                 if (lm != NULL) {
7637                         chk->last_mbuf = lm;
7638                         chk->pad_inplace = 1;
7639                 }
7640                 chk->send_size += pads;
7641         }
7642         if (PR_SCTP_ENABLED(chk->flags)) {
7643                 asoc->pr_sctp_cnt++;
7644         }
7645         if (sp->msg_is_complete && (sp->length == 0) && (sp->sender_all_done)) {
7646                 /* All done pull and kill the message */
7647                 if (sp->put_last_out == 0) {
7648                         SCTP_PRINTF("Gak, put out entire msg with NO end!-2\n");
7649                         SCTP_PRINTF("sender_done:%d len:%d msg_comp:%d put_last_out:%d send_lock:%d\n",
7650                             sp->sender_all_done,
7651                             sp->length,
7652                             sp->msg_is_complete,
7653                             sp->put_last_out,
7654                             send_lock_up);
7655                 }
7656                 if ((send_lock_up == 0) && (TAILQ_NEXT(sp, next) == NULL)) {
7657                         SCTP_TCB_SEND_LOCK(stcb);
7658                         send_lock_up = 1;
7659                 }
7660                 atomic_subtract_int(&asoc->stream_queue_cnt, 1);
7661                 TAILQ_REMOVE(&strq->outqueue, sp, next);
7662                 stcb->asoc.ss_functions.sctp_ss_remove_from_stream(stcb, asoc, strq, sp, send_lock_up);
7663                 if ((strq->state == SCTP_STREAM_RESET_PENDING) &&
7664                     (strq->chunks_on_queues == 0) &&
7665                     TAILQ_EMPTY(&strq->outqueue)) {
7666                         stcb->asoc.trigger_reset = 1;
7667                 }
7668                 if (sp->net) {
7669                         sctp_free_remote_addr(sp->net);
7670                         sp->net = NULL;
7671                 }
7672                 if (sp->data) {
7673                         sctp_m_freem(sp->data);
7674                         sp->data = NULL;
7675                 }
7676                 sctp_free_a_strmoq(stcb, sp, so_locked);
7677         }
7678         asoc->chunks_on_out_queue++;
7679         strq->chunks_on_queues++;
7680         TAILQ_INSERT_TAIL(&asoc->send_queue, chk, sctp_next);
7681         asoc->send_queue_cnt++;
7682 out_of:
7683         if (send_lock_up) {
7684                 SCTP_TCB_SEND_UNLOCK(stcb);
7685         }
7686         return (to_move);
7687 }
7688
7689
7690 static void
7691 sctp_fill_outqueue(struct sctp_tcb *stcb,
7692     struct sctp_nets *net, int frag_point, int eeor_mode, int *quit_now, int so_locked
7693 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
7694     SCTP_UNUSED
7695 #endif
7696 )
7697 {
7698         struct sctp_association *asoc;
7699         struct sctp_stream_out *strq;
7700         uint32_t space_left, moved, total_moved;
7701         int bail, giveup;
7702
7703         SCTP_TCB_LOCK_ASSERT(stcb);
7704         asoc = &stcb->asoc;
7705         total_moved = 0;
7706         switch (net->ro._l_addr.sa.sa_family) {
7707 #ifdef INET
7708         case AF_INET:
7709                 space_left = net->mtu - SCTP_MIN_V4_OVERHEAD;
7710                 break;
7711 #endif
7712 #ifdef INET6
7713         case AF_INET6:
7714                 space_left = net->mtu - SCTP_MIN_OVERHEAD;
7715                 break;
7716 #endif
7717         default:
7718                 /* TSNH */
7719                 space_left = net->mtu;
7720                 break;
7721         }
7722         /* Need an allowance for the data chunk header too */
7723         space_left -= SCTP_DATA_CHUNK_OVERHEAD(stcb);
7724
7725         /* must make even word boundary */
7726         space_left &= 0xfffffffc;
7727         strq = stcb->asoc.ss_functions.sctp_ss_select_stream(stcb, net, asoc);
7728         giveup = 0;
7729         bail = 0;
7730         while ((space_left > 0) && (strq != NULL)) {
7731                 moved = sctp_move_to_outqueue(stcb, strq, space_left, frag_point,
7732                     &giveup, eeor_mode, &bail, so_locked);
7733                 stcb->asoc.ss_functions.sctp_ss_scheduled(stcb, net, asoc, strq, moved);
7734                 if ((giveup != 0) || (bail != 0)) {
7735                         break;
7736                 }
7737                 strq = stcb->asoc.ss_functions.sctp_ss_select_stream(stcb, net, asoc);
7738                 total_moved += moved;
7739                 space_left -= moved;
7740                 if (space_left >= SCTP_DATA_CHUNK_OVERHEAD(stcb)) {
7741                         space_left -= SCTP_DATA_CHUNK_OVERHEAD(stcb);
7742                 } else {
7743                         space_left = 0;
7744                 }
7745                 space_left &= 0xfffffffc;
7746         }
7747         if (bail != 0)
7748                 *quit_now = 1;
7749
7750         stcb->asoc.ss_functions.sctp_ss_packet_done(stcb, net, asoc);
7751
7752         if (total_moved == 0) {
7753                 if ((stcb->asoc.sctp_cmt_on_off == 0) &&
7754                     (net == stcb->asoc.primary_destination)) {
7755                         /* ran dry for primary network net */
7756                         SCTP_STAT_INCR(sctps_primary_randry);
7757                 } else if (stcb->asoc.sctp_cmt_on_off > 0) {
7758                         /* ran dry with CMT on */
7759                         SCTP_STAT_INCR(sctps_cmt_randry);
7760                 }
7761         }
7762 }
7763
7764 void
7765 sctp_fix_ecn_echo(struct sctp_association *asoc)
7766 {
7767         struct sctp_tmit_chunk *chk;
7768
7769         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
7770                 if (chk->rec.chunk_id.id == SCTP_ECN_ECHO) {
7771                         chk->sent = SCTP_DATAGRAM_UNSENT;
7772                 }
7773         }
7774 }
7775
7776 void
7777 sctp_move_chunks_from_net(struct sctp_tcb *stcb, struct sctp_nets *net)
7778 {
7779         struct sctp_association *asoc;
7780         struct sctp_tmit_chunk *chk;
7781         struct sctp_stream_queue_pending *sp;
7782         unsigned int i;
7783
7784         if (net == NULL) {
7785                 return;
7786         }
7787         asoc = &stcb->asoc;
7788         for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
7789                 TAILQ_FOREACH(sp, &stcb->asoc.strmout[i].outqueue, next) {
7790                         if (sp->net == net) {
7791                                 sctp_free_remote_addr(sp->net);
7792                                 sp->net = NULL;
7793                         }
7794                 }
7795         }
7796         TAILQ_FOREACH(chk, &asoc->send_queue, sctp_next) {
7797                 if (chk->whoTo == net) {
7798                         sctp_free_remote_addr(chk->whoTo);
7799                         chk->whoTo = NULL;
7800                 }
7801         }
7802 }
7803
7804 int
7805 sctp_med_chunk_output(struct sctp_inpcb *inp,
7806     struct sctp_tcb *stcb,
7807     struct sctp_association *asoc,
7808     int *num_out,
7809     int *reason_code,
7810     int control_only, int from_where,
7811     struct timeval *now, int *now_filled, int frag_point, int so_locked
7812 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
7813     SCTP_UNUSED
7814 #endif
7815 )
7816 {
7817         /**
7818          * Ok this is the generic chunk service queue. we must do the
7819          * following:
7820          * - Service the stream queue that is next, moving any
7821          *   message (note I must get a complete message i.e. FIRST/MIDDLE and
7822          *   LAST to the out queue in one pass) and assigning TSN's. This
7823          *   only applys though if the peer does not support NDATA. For NDATA
7824          *   chunks its ok to not send the entire message ;-)
7825          * - Check to see if the cwnd/rwnd allows any output, if so we go ahead and
7826          *   fomulate and send the low level chunks. Making sure to combine
7827          *   any control in the control chunk queue also.
7828          */
7829         struct sctp_nets *net, *start_at, *sack_goes_to = NULL, *old_start_at = NULL;
7830         struct mbuf *outchain, *endoutchain;
7831         struct sctp_tmit_chunk *chk, *nchk;
7832
7833         /* temp arrays for unlinking */
7834         struct sctp_tmit_chunk *data_list[SCTP_MAX_DATA_BUNDLING];
7835         int no_fragmentflg, error;
7836         unsigned int max_rwnd_per_dest, max_send_per_dest;
7837         int one_chunk, hbflag, skip_data_for_this_net;
7838         int asconf, cookie, no_out_cnt;
7839         int bundle_at, ctl_cnt, no_data_chunks, eeor_mode;
7840         unsigned int mtu, r_mtu, omtu, mx_mtu, to_out;
7841         int tsns_sent = 0;
7842         uint32_t auth_offset = 0;
7843         struct sctp_auth_chunk *auth = NULL;
7844         uint16_t auth_keyid;
7845         int override_ok = 1;
7846         int skip_fill_up = 0;
7847         int data_auth_reqd = 0;
7848
7849         /*
7850          * JRS 5/14/07 - Add flag for whether a heartbeat is sent to the
7851          * destination.
7852          */
7853         int quit_now = 0;
7854
7855         *num_out = 0;
7856         *reason_code = 0;
7857         auth_keyid = stcb->asoc.authinfo.active_keyid;
7858         if ((asoc->state & SCTP_STATE_SHUTDOWN_PENDING) ||
7859             (asoc->state & SCTP_STATE_SHUTDOWN_RECEIVED) ||
7860             (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_EXPLICIT_EOR))) {
7861                 eeor_mode = 1;
7862         } else {
7863                 eeor_mode = 0;
7864         }
7865         ctl_cnt = no_out_cnt = asconf = cookie = 0;
7866         /*
7867          * First lets prime the pump. For each destination, if there is room
7868          * in the flight size, attempt to pull an MTU's worth out of the
7869          * stream queues into the general send_queue
7870          */
7871 #ifdef SCTP_AUDITING_ENABLED
7872         sctp_audit_log(0xC2, 2);
7873 #endif
7874         SCTP_TCB_LOCK_ASSERT(stcb);
7875         hbflag = 0;
7876         if (control_only)
7877                 no_data_chunks = 1;
7878         else
7879                 no_data_chunks = 0;
7880
7881         /* Nothing to possible to send? */
7882         if ((TAILQ_EMPTY(&asoc->control_send_queue) ||
7883             (asoc->ctrl_queue_cnt == stcb->asoc.ecn_echo_cnt_onq)) &&
7884             TAILQ_EMPTY(&asoc->asconf_send_queue) &&
7885             TAILQ_EMPTY(&asoc->send_queue) &&
7886             sctp_is_there_unsent_data(stcb, so_locked) == 0) {
7887 nothing_to_send:
7888                 *reason_code = 9;
7889                 return (0);
7890         }
7891         if (asoc->peers_rwnd == 0) {
7892                 /* No room in peers rwnd */
7893                 *reason_code = 1;
7894                 if (asoc->total_flight > 0) {
7895                         /* we are allowed one chunk in flight */
7896                         no_data_chunks = 1;
7897                 }
7898         }
7899         if (stcb->asoc.ecn_echo_cnt_onq) {
7900                 /* Record where a sack goes, if any */
7901                 if (no_data_chunks &&
7902                     (asoc->ctrl_queue_cnt == stcb->asoc.ecn_echo_cnt_onq)) {
7903                         /* Nothing but ECNe to send - we don't do that */
7904                         goto nothing_to_send;
7905                 }
7906                 TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
7907                         if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
7908                             (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK)) {
7909                                 sack_goes_to = chk->whoTo;
7910                                 break;
7911                         }
7912                 }
7913         }
7914         max_rwnd_per_dest = ((asoc->peers_rwnd + asoc->total_flight) / asoc->numnets);
7915         if (stcb->sctp_socket)
7916                 max_send_per_dest = SCTP_SB_LIMIT_SND(stcb->sctp_socket) / asoc->numnets;
7917         else
7918                 max_send_per_dest = 0;
7919         if (no_data_chunks == 0) {
7920                 /* How many non-directed chunks are there? */
7921                 TAILQ_FOREACH(chk, &asoc->send_queue, sctp_next) {
7922                         if (chk->whoTo == NULL) {
7923                                 /*
7924                                  * We already have non-directed chunks on
7925                                  * the queue, no need to do a fill-up.
7926                                  */
7927                                 skip_fill_up = 1;
7928                                 break;
7929                         }
7930                 }
7931
7932         }
7933         if ((no_data_chunks == 0) &&
7934             (skip_fill_up == 0) &&
7935             (!stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc))) {
7936                 TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
7937                         /*
7938                          * This for loop we are in takes in each net, if
7939                          * its's got space in cwnd and has data sent to it
7940                          * (when CMT is off) then it calls
7941                          * sctp_fill_outqueue for the net. This gets data on
7942                          * the send queue for that network.
7943                          *
7944                          * In sctp_fill_outqueue TSN's are assigned and data
7945                          * is copied out of the stream buffers. Note mostly
7946                          * copy by reference (we hope).
7947                          */
7948                         net->window_probe = 0;
7949                         if ((net != stcb->asoc.alternate) &&
7950                             ((net->dest_state & SCTP_ADDR_PF) ||
7951                             (!(net->dest_state & SCTP_ADDR_REACHABLE)) ||
7952                             (net->dest_state & SCTP_ADDR_UNCONFIRMED))) {
7953                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
7954                                         sctp_log_cwnd(stcb, net, 1,
7955                                             SCTP_CWND_LOG_FILL_OUTQ_CALLED);
7956                                 }
7957                                 continue;
7958                         }
7959                         if ((stcb->asoc.cc_functions.sctp_cwnd_new_transmission_begins) &&
7960                             (net->flight_size == 0)) {
7961                                 (*stcb->asoc.cc_functions.sctp_cwnd_new_transmission_begins) (stcb, net);
7962                         }
7963                         if (net->flight_size >= net->cwnd) {
7964                                 /* skip this network, no room - can't fill */
7965                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
7966                                         sctp_log_cwnd(stcb, net, 3,
7967                                             SCTP_CWND_LOG_FILL_OUTQ_CALLED);
7968                                 }
7969                                 continue;
7970                         }
7971                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
7972                                 sctp_log_cwnd(stcb, net, 4, SCTP_CWND_LOG_FILL_OUTQ_CALLED);
7973                         }
7974                         sctp_fill_outqueue(stcb, net, frag_point, eeor_mode, &quit_now, so_locked);
7975                         if (quit_now) {
7976                                 /* memory alloc failure */
7977                                 no_data_chunks = 1;
7978                                 break;
7979                         }
7980                 }
7981         }
7982         /* now service each destination and send out what we can for it */
7983         /* Nothing to send? */
7984         if (TAILQ_EMPTY(&asoc->control_send_queue) &&
7985             TAILQ_EMPTY(&asoc->asconf_send_queue) &&
7986             TAILQ_EMPTY(&asoc->send_queue)) {
7987                 *reason_code = 8;
7988                 return (0);
7989         }
7990
7991         if (asoc->sctp_cmt_on_off > 0) {
7992                 /* get the last start point */
7993                 start_at = asoc->last_net_cmt_send_started;
7994                 if (start_at == NULL) {
7995                         /* null so to beginning */
7996                         start_at = TAILQ_FIRST(&asoc->nets);
7997                 } else {
7998                         start_at = TAILQ_NEXT(asoc->last_net_cmt_send_started, sctp_next);
7999                         if (start_at == NULL) {
8000                                 start_at = TAILQ_FIRST(&asoc->nets);
8001                         }
8002                 }
8003                 asoc->last_net_cmt_send_started = start_at;
8004         } else {
8005                 start_at = TAILQ_FIRST(&asoc->nets);
8006         }
8007         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
8008                 if (chk->whoTo == NULL) {
8009                         if (asoc->alternate) {
8010                                 chk->whoTo = asoc->alternate;
8011                         } else {
8012                                 chk->whoTo = asoc->primary_destination;
8013                         }
8014                         atomic_add_int(&chk->whoTo->ref_count, 1);
8015                 }
8016         }
8017         old_start_at = NULL;
8018 again_one_more_time:
8019         for (net = start_at; net != NULL; net = TAILQ_NEXT(net, sctp_next)) {
8020                 /* how much can we send? */
8021                 /* SCTPDBG("Examine for sending net:%x\n", (uint32_t)net); */
8022                 if (old_start_at && (old_start_at == net)) {
8023                         /* through list ocmpletely. */
8024                         break;
8025                 }
8026                 tsns_sent = 0xa;
8027                 if (TAILQ_EMPTY(&asoc->control_send_queue) &&
8028                     TAILQ_EMPTY(&asoc->asconf_send_queue) &&
8029                     (net->flight_size >= net->cwnd)) {
8030                         /*
8031                          * Nothing on control or asconf and flight is full,
8032                          * we can skip even in the CMT case.
8033                          */
8034                         continue;
8035                 }
8036                 bundle_at = 0;
8037                 endoutchain = outchain = NULL;
8038                 no_fragmentflg = 1;
8039                 one_chunk = 0;
8040                 if (net->dest_state & SCTP_ADDR_UNCONFIRMED) {
8041                         skip_data_for_this_net = 1;
8042                 } else {
8043                         skip_data_for_this_net = 0;
8044                 }
8045                 switch (((struct sockaddr *)&net->ro._l_addr)->sa_family) {
8046 #ifdef INET
8047                 case AF_INET:
8048                         mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
8049                         break;
8050 #endif
8051 #ifdef INET6
8052                 case AF_INET6:
8053                         mtu = net->mtu - SCTP_MIN_OVERHEAD;
8054                         break;
8055 #endif
8056                 default:
8057                         /* TSNH */
8058                         mtu = net->mtu;
8059                         break;
8060                 }
8061                 mx_mtu = mtu;
8062                 to_out = 0;
8063                 if (mtu > asoc->peers_rwnd) {
8064                         if (asoc->total_flight > 0) {
8065                                 /* We have a packet in flight somewhere */
8066                                 r_mtu = asoc->peers_rwnd;
8067                         } else {
8068                                 /* We are always allowed to send one MTU out */
8069                                 one_chunk = 1;
8070                                 r_mtu = mtu;
8071                         }
8072                 } else {
8073                         r_mtu = mtu;
8074                 }
8075                 error = 0;
8076                 /************************/
8077                 /* ASCONF transmission */
8078                 /************************/
8079                 /* Now first lets go through the asconf queue */
8080                 TAILQ_FOREACH_SAFE(chk, &asoc->asconf_send_queue, sctp_next, nchk) {
8081                         if (chk->rec.chunk_id.id != SCTP_ASCONF) {
8082                                 continue;
8083                         }
8084                         if (chk->whoTo == NULL) {
8085                                 if (asoc->alternate == NULL) {
8086                                         if (asoc->primary_destination != net) {
8087                                                 break;
8088                                         }
8089                                 } else {
8090                                         if (asoc->alternate != net) {
8091                                                 break;
8092                                         }
8093                                 }
8094                         } else {
8095                                 if (chk->whoTo != net) {
8096                                         break;
8097                                 }
8098                         }
8099                         if (chk->data == NULL) {
8100                                 break;
8101                         }
8102                         if (chk->sent != SCTP_DATAGRAM_UNSENT &&
8103                             chk->sent != SCTP_DATAGRAM_RESEND) {
8104                                 break;
8105                         }
8106                         /*
8107                          * if no AUTH is yet included and this chunk
8108                          * requires it, make sure to account for it.  We
8109                          * don't apply the size until the AUTH chunk is
8110                          * actually added below in case there is no room for
8111                          * this chunk. NOTE: we overload the use of "omtu"
8112                          * here
8113                          */
8114                         if ((auth == NULL) &&
8115                             sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
8116                             stcb->asoc.peer_auth_chunks)) {
8117                                 omtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
8118                         } else
8119                                 omtu = 0;
8120                         /* Here we do NOT factor the r_mtu */
8121                         if ((chk->send_size < (int)(mtu - omtu)) ||
8122                             (chk->flags & CHUNK_FLAGS_FRAGMENT_OK)) {
8123                                 /*
8124                                  * We probably should glom the mbuf chain
8125                                  * from the chk->data for control but the
8126                                  * problem is it becomes yet one more level
8127                                  * of tracking to do if for some reason
8128                                  * output fails. Then I have got to
8129                                  * reconstruct the merged control chain.. el
8130                                  * yucko.. for now we take the easy way and
8131                                  * do the copy
8132                                  */
8133                                 /*
8134                                  * Add an AUTH chunk, if chunk requires it
8135                                  * save the offset into the chain for AUTH
8136                                  */
8137                                 if ((auth == NULL) &&
8138                                     (sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
8139                                     stcb->asoc.peer_auth_chunks))) {
8140                                         outchain = sctp_add_auth_chunk(outchain,
8141                                             &endoutchain,
8142                                             &auth,
8143                                             &auth_offset,
8144                                             stcb,
8145                                             chk->rec.chunk_id.id);
8146                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8147                                 }
8148                                 outchain = sctp_copy_mbufchain(chk->data, outchain, &endoutchain,
8149                                     (int)chk->rec.chunk_id.can_take_data,
8150                                     chk->send_size, chk->copy_by_ref);
8151                                 if (outchain == NULL) {
8152                                         *reason_code = 8;
8153                                         SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
8154                                         return (ENOMEM);
8155                                 }
8156                                 SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8157                                 /* update our MTU size */
8158                                 if (mtu > (chk->send_size + omtu))
8159                                         mtu -= (chk->send_size + omtu);
8160                                 else
8161                                         mtu = 0;
8162                                 to_out += (chk->send_size + omtu);
8163                                 /* Do clear IP_DF ? */
8164                                 if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
8165                                         no_fragmentflg = 0;
8166                                 }
8167                                 if (chk->rec.chunk_id.can_take_data)
8168                                         chk->data = NULL;
8169                                 /*
8170                                  * set hb flag since we can use these for
8171                                  * RTO
8172                                  */
8173                                 hbflag = 1;
8174                                 asconf = 1;
8175                                 /*
8176                                  * should sysctl this: don't bundle data
8177                                  * with ASCONF since it requires AUTH
8178                                  */
8179                                 no_data_chunks = 1;
8180                                 chk->sent = SCTP_DATAGRAM_SENT;
8181                                 if (chk->whoTo == NULL) {
8182                                         chk->whoTo = net;
8183                                         atomic_add_int(&net->ref_count, 1);
8184                                 }
8185                                 chk->snd_count++;
8186                                 if (mtu == 0) {
8187                                         /*
8188                                          * Ok we are out of room but we can
8189                                          * output without effecting the
8190                                          * flight size since this little guy
8191                                          * is a control only packet.
8192                                          */
8193                                         sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp, stcb, net);
8194                                         /*
8195                                          * do NOT clear the asconf flag as
8196                                          * it is used to do appropriate
8197                                          * source address selection.
8198                                          */
8199                                         if (*now_filled == 0) {
8200                                                 (void)SCTP_GETTIME_TIMEVAL(now);
8201                                                 *now_filled = 1;
8202                                         }
8203                                         net->last_sent_time = *now;
8204                                         hbflag = 0;
8205                                         if ((error = sctp_lowlevel_chunk_output(inp, stcb, net,
8206                                             (struct sockaddr *)&net->ro._l_addr,
8207                                             outchain, auth_offset, auth,
8208                                             stcb->asoc.authinfo.active_keyid,
8209                                             no_fragmentflg, 0, asconf,
8210                                             inp->sctp_lport, stcb->rport,
8211                                             htonl(stcb->asoc.peer_vtag),
8212                                             net->port, NULL,
8213                                             0, 0,
8214                                             so_locked))) {
8215                                                 /*
8216                                                  * error, we could not
8217                                                  * output
8218                                                  */
8219                                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
8220                                                 if (from_where == 0) {
8221                                                         SCTP_STAT_INCR(sctps_lowlevelerrusr);
8222                                                 }
8223                                                 if (error == ENOBUFS) {
8224                                                         asoc->ifp_had_enobuf = 1;
8225                                                         SCTP_STAT_INCR(sctps_lowlevelerr);
8226                                                 }
8227                                                 /* error, could not output */
8228                                                 if (error == EHOSTUNREACH) {
8229                                                         /*
8230                                                          * Destination went
8231                                                          * unreachable
8232                                                          * during this send
8233                                                          */
8234                                                         sctp_move_chunks_from_net(stcb, net);
8235                                                 }
8236                                                 *reason_code = 7;
8237                                                 break;
8238                                         } else {
8239                                                 asoc->ifp_had_enobuf = 0;
8240                                         }
8241                                         /*
8242                                          * increase the number we sent, if a
8243                                          * cookie is sent we don't tell them
8244                                          * any was sent out.
8245                                          */
8246                                         outchain = endoutchain = NULL;
8247                                         auth = NULL;
8248                                         auth_offset = 0;
8249                                         if (!no_out_cnt)
8250                                                 *num_out += ctl_cnt;
8251                                         /* recalc a clean slate and setup */
8252                                         switch (net->ro._l_addr.sa.sa_family) {
8253 #ifdef INET
8254                                         case AF_INET:
8255                                                 mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
8256                                                 break;
8257 #endif
8258 #ifdef INET6
8259                                         case AF_INET6:
8260                                                 mtu = net->mtu - SCTP_MIN_OVERHEAD;
8261                                                 break;
8262 #endif
8263                                         default:
8264                                                 /* TSNH */
8265                                                 mtu = net->mtu;
8266                                                 break;
8267                                         }
8268                                         to_out = 0;
8269                                         no_fragmentflg = 1;
8270                                 }
8271                         }
8272                 }
8273                 if (error != 0) {
8274                         /* try next net */
8275                         continue;
8276                 }
8277                 /************************/
8278                 /* Control transmission */
8279                 /************************/
8280                 /* Now first lets go through the control queue */
8281                 TAILQ_FOREACH_SAFE(chk, &asoc->control_send_queue, sctp_next, nchk) {
8282                         if ((sack_goes_to) &&
8283                             (chk->rec.chunk_id.id == SCTP_ECN_ECHO) &&
8284                             (chk->whoTo != sack_goes_to)) {
8285                                 /*
8286                                  * if we have a sack in queue, and we are
8287                                  * looking at an ecn echo that is NOT queued
8288                                  * to where the sack is going..
8289                                  */
8290                                 if (chk->whoTo == net) {
8291                                         /*
8292                                          * Don't transmit it to where its
8293                                          * going (current net)
8294                                          */
8295                                         continue;
8296                                 } else if (sack_goes_to == net) {
8297                                         /*
8298                                          * But do transmit it to this
8299                                          * address
8300                                          */
8301                                         goto skip_net_check;
8302                                 }
8303                         }
8304                         if (chk->whoTo == NULL) {
8305                                 if (asoc->alternate == NULL) {
8306                                         if (asoc->primary_destination != net) {
8307                                                 continue;
8308                                         }
8309                                 } else {
8310                                         if (asoc->alternate != net) {
8311                                                 continue;
8312                                         }
8313                                 }
8314                         } else {
8315                                 if (chk->whoTo != net) {
8316                                         continue;
8317                                 }
8318                         }
8319         skip_net_check:
8320                         if (chk->data == NULL) {
8321                                 continue;
8322                         }
8323                         if (chk->sent != SCTP_DATAGRAM_UNSENT) {
8324                                 /*
8325                                  * It must be unsent. Cookies and ASCONF's
8326                                  * hang around but there timers will force
8327                                  * when marked for resend.
8328                                  */
8329                                 continue;
8330                         }
8331                         /*
8332                          * if no AUTH is yet included and this chunk
8333                          * requires it, make sure to account for it.  We
8334                          * don't apply the size until the AUTH chunk is
8335                          * actually added below in case there is no room for
8336                          * this chunk. NOTE: we overload the use of "omtu"
8337                          * here
8338                          */
8339                         if ((auth == NULL) &&
8340                             sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
8341                             stcb->asoc.peer_auth_chunks)) {
8342                                 omtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
8343                         } else
8344                                 omtu = 0;
8345                         /* Here we do NOT factor the r_mtu */
8346                         if ((chk->send_size <= (int)(mtu - omtu)) ||
8347                             (chk->flags & CHUNK_FLAGS_FRAGMENT_OK)) {
8348                                 /*
8349                                  * We probably should glom the mbuf chain
8350                                  * from the chk->data for control but the
8351                                  * problem is it becomes yet one more level
8352                                  * of tracking to do if for some reason
8353                                  * output fails. Then I have got to
8354                                  * reconstruct the merged control chain.. el
8355                                  * yucko.. for now we take the easy way and
8356                                  * do the copy
8357                                  */
8358                                 /*
8359                                  * Add an AUTH chunk, if chunk requires it
8360                                  * save the offset into the chain for AUTH
8361                                  */
8362                                 if ((auth == NULL) &&
8363                                     (sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
8364                                     stcb->asoc.peer_auth_chunks))) {
8365                                         outchain = sctp_add_auth_chunk(outchain,
8366                                             &endoutchain,
8367                                             &auth,
8368                                             &auth_offset,
8369                                             stcb,
8370                                             chk->rec.chunk_id.id);
8371                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8372                                 }
8373                                 outchain = sctp_copy_mbufchain(chk->data, outchain, &endoutchain,
8374                                     (int)chk->rec.chunk_id.can_take_data,
8375                                     chk->send_size, chk->copy_by_ref);
8376                                 if (outchain == NULL) {
8377                                         *reason_code = 8;
8378                                         SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
8379                                         return (ENOMEM);
8380                                 }
8381                                 SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8382                                 /* update our MTU size */
8383                                 if (mtu > (chk->send_size + omtu))
8384                                         mtu -= (chk->send_size + omtu);
8385                                 else
8386                                         mtu = 0;
8387                                 to_out += (chk->send_size + omtu);
8388                                 /* Do clear IP_DF ? */
8389                                 if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
8390                                         no_fragmentflg = 0;
8391                                 }
8392                                 if (chk->rec.chunk_id.can_take_data)
8393                                         chk->data = NULL;
8394                                 /* Mark things to be removed, if needed */
8395                                 if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
8396                                     (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK) ||  /* EY */
8397                                     (chk->rec.chunk_id.id == SCTP_HEARTBEAT_REQUEST) ||
8398                                     (chk->rec.chunk_id.id == SCTP_HEARTBEAT_ACK) ||
8399                                     (chk->rec.chunk_id.id == SCTP_SHUTDOWN) ||
8400                                     (chk->rec.chunk_id.id == SCTP_SHUTDOWN_ACK) ||
8401                                     (chk->rec.chunk_id.id == SCTP_OPERATION_ERROR) ||
8402                                     (chk->rec.chunk_id.id == SCTP_COOKIE_ACK) ||
8403                                     (chk->rec.chunk_id.id == SCTP_ECN_CWR) ||
8404                                     (chk->rec.chunk_id.id == SCTP_PACKET_DROPPED) ||
8405                                     (chk->rec.chunk_id.id == SCTP_ASCONF_ACK)) {
8406                                         if (chk->rec.chunk_id.id == SCTP_HEARTBEAT_REQUEST) {
8407                                                 hbflag = 1;
8408                                         }
8409                                         /* remove these chunks at the end */
8410                                         if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
8411                                             (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK)) {
8412                                                 /* turn off the timer */
8413                                                 if (SCTP_OS_TIMER_PENDING(&stcb->asoc.dack_timer.timer)) {
8414                                                         sctp_timer_stop(SCTP_TIMER_TYPE_RECV,
8415                                                             inp, stcb, net,
8416                                                             SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_1);
8417                                                 }
8418                                         }
8419                                         ctl_cnt++;
8420                                 } else {
8421                                         /*
8422                                          * Other chunks, since they have
8423                                          * timers running (i.e. COOKIE) we
8424                                          * just "trust" that it gets sent or
8425                                          * retransmitted.
8426                                          */
8427                                         ctl_cnt++;
8428                                         if (chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
8429                                                 cookie = 1;
8430                                                 no_out_cnt = 1;
8431                                         } else if (chk->rec.chunk_id.id == SCTP_ECN_ECHO) {
8432                                                 /*
8433                                                  * Increment ecne send count
8434                                                  * here this means we may be
8435                                                  * over-zealous in our
8436                                                  * counting if the send
8437                                                  * fails, but its the best
8438                                                  * place to do it (we used
8439                                                  * to do it in the queue of
8440                                                  * the chunk, but that did
8441                                                  * not tell how many times
8442                                                  * it was sent.
8443                                                  */
8444                                                 SCTP_STAT_INCR(sctps_sendecne);
8445                                         }
8446                                         chk->sent = SCTP_DATAGRAM_SENT;
8447                                         if (chk->whoTo == NULL) {
8448                                                 chk->whoTo = net;
8449                                                 atomic_add_int(&net->ref_count, 1);
8450                                         }
8451                                         chk->snd_count++;
8452                                 }
8453                                 if (mtu == 0) {
8454                                         /*
8455                                          * Ok we are out of room but we can
8456                                          * output without effecting the
8457                                          * flight size since this little guy
8458                                          * is a control only packet.
8459                                          */
8460                                         if (asconf) {
8461                                                 sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp, stcb, net);
8462                                                 /*
8463                                                  * do NOT clear the asconf
8464                                                  * flag as it is used to do
8465                                                  * appropriate source
8466                                                  * address selection.
8467                                                  */
8468                                         }
8469                                         if (cookie) {
8470                                                 sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, inp, stcb, net);
8471                                                 cookie = 0;
8472                                         }
8473                                         /* Only HB or ASCONF advances time */
8474                                         if (hbflag) {
8475                                                 if (*now_filled == 0) {
8476                                                         (void)SCTP_GETTIME_TIMEVAL(now);
8477                                                         *now_filled = 1;
8478                                                 }
8479                                                 net->last_sent_time = *now;
8480                                                 hbflag = 0;
8481                                         }
8482                                         if ((error = sctp_lowlevel_chunk_output(inp, stcb, net,
8483                                             (struct sockaddr *)&net->ro._l_addr,
8484                                             outchain,
8485                                             auth_offset, auth,
8486                                             stcb->asoc.authinfo.active_keyid,
8487                                             no_fragmentflg, 0, asconf,
8488                                             inp->sctp_lport, stcb->rport,
8489                                             htonl(stcb->asoc.peer_vtag),
8490                                             net->port, NULL,
8491                                             0, 0,
8492                                             so_locked))) {
8493                                                 /*
8494                                                  * error, we could not
8495                                                  * output
8496                                                  */
8497                                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
8498                                                 if (from_where == 0) {
8499                                                         SCTP_STAT_INCR(sctps_lowlevelerrusr);
8500                                                 }
8501                                                 if (error == ENOBUFS) {
8502                                                         asoc->ifp_had_enobuf = 1;
8503                                                         SCTP_STAT_INCR(sctps_lowlevelerr);
8504                                                 }
8505                                                 if (error == EHOSTUNREACH) {
8506                                                         /*
8507                                                          * Destination went
8508                                                          * unreachable
8509                                                          * during this send
8510                                                          */
8511                                                         sctp_move_chunks_from_net(stcb, net);
8512                                                 }
8513                                                 *reason_code = 7;
8514                                                 break;
8515                                         } else {
8516                                                 asoc->ifp_had_enobuf = 0;
8517                                         }
8518                                         /*
8519                                          * increase the number we sent, if a
8520                                          * cookie is sent we don't tell them
8521                                          * any was sent out.
8522                                          */
8523                                         outchain = endoutchain = NULL;
8524                                         auth = NULL;
8525                                         auth_offset = 0;
8526                                         if (!no_out_cnt)
8527                                                 *num_out += ctl_cnt;
8528                                         /* recalc a clean slate and setup */
8529                                         switch (net->ro._l_addr.sa.sa_family) {
8530 #ifdef INET
8531                                         case AF_INET:
8532                                                 mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
8533                                                 break;
8534 #endif
8535 #ifdef INET6
8536                                         case AF_INET6:
8537                                                 mtu = net->mtu - SCTP_MIN_OVERHEAD;
8538                                                 break;
8539 #endif
8540                                         default:
8541                                                 /* TSNH */
8542                                                 mtu = net->mtu;
8543                                                 break;
8544                                         }
8545                                         to_out = 0;
8546                                         no_fragmentflg = 1;
8547                                 }
8548                         }
8549                 }
8550                 if (error != 0) {
8551                         /* try next net */
8552                         continue;
8553                 }
8554                 /* JRI: if dest is in PF state, do not send data to it */
8555                 if ((asoc->sctp_cmt_on_off > 0) &&
8556                     (net != stcb->asoc.alternate) &&
8557                     (net->dest_state & SCTP_ADDR_PF)) {
8558                         goto no_data_fill;
8559                 }
8560                 if (net->flight_size >= net->cwnd) {
8561                         goto no_data_fill;
8562                 }
8563                 if ((asoc->sctp_cmt_on_off > 0) &&
8564                     (SCTP_BASE_SYSCTL(sctp_buffer_splitting) & SCTP_RECV_BUFFER_SPLITTING) &&
8565                     (net->flight_size > max_rwnd_per_dest)) {
8566                         goto no_data_fill;
8567                 }
8568                 /*
8569                  * We need a specific accounting for the usage of the send
8570                  * buffer. We also need to check the number of messages per
8571                  * net. For now, this is better than nothing and it disabled
8572                  * by default...
8573                  */
8574                 if ((asoc->sctp_cmt_on_off > 0) &&
8575                     (SCTP_BASE_SYSCTL(sctp_buffer_splitting) & SCTP_SEND_BUFFER_SPLITTING) &&
8576                     (max_send_per_dest > 0) &&
8577                     (net->flight_size > max_send_per_dest)) {
8578                         goto no_data_fill;
8579                 }
8580                 /*********************/
8581                 /* Data transmission */
8582                 /*********************/
8583                 /*
8584                  * if AUTH for DATA is required and no AUTH has been added
8585                  * yet, account for this in the mtu now... if no data can be
8586                  * bundled, this adjustment won't matter anyways since the
8587                  * packet will be going out...
8588                  */
8589                 data_auth_reqd = sctp_auth_is_required_chunk(SCTP_DATA,
8590                     stcb->asoc.peer_auth_chunks);
8591                 if (data_auth_reqd && (auth == NULL)) {
8592                         mtu -= sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
8593                 }
8594                 /* now lets add any data within the MTU constraints */
8595                 switch (((struct sockaddr *)&net->ro._l_addr)->sa_family) {
8596 #ifdef INET
8597                 case AF_INET:
8598                         if (net->mtu > SCTP_MIN_V4_OVERHEAD)
8599                                 omtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
8600                         else
8601                                 omtu = 0;
8602                         break;
8603 #endif
8604 #ifdef INET6
8605                 case AF_INET6:
8606                         if (net->mtu > SCTP_MIN_OVERHEAD)
8607                                 omtu = net->mtu - SCTP_MIN_OVERHEAD;
8608                         else
8609                                 omtu = 0;
8610                         break;
8611 #endif
8612                 default:
8613                         /* TSNH */
8614                         omtu = 0;
8615                         break;
8616                 }
8617                 if ((((SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) ||
8618                     (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED)) &&
8619                     (skip_data_for_this_net == 0)) ||
8620                     (cookie)) {
8621                         TAILQ_FOREACH_SAFE(chk, &asoc->send_queue, sctp_next, nchk) {
8622                                 if (no_data_chunks) {
8623                                         /* let only control go out */
8624                                         *reason_code = 1;
8625                                         break;
8626                                 }
8627                                 if (net->flight_size >= net->cwnd) {
8628                                         /* skip this net, no room for data */
8629                                         *reason_code = 2;
8630                                         break;
8631                                 }
8632                                 if ((chk->whoTo != NULL) &&
8633                                     (chk->whoTo != net)) {
8634                                         /* Don't send the chunk on this net */
8635                                         continue;
8636                                 }
8637
8638                                 if (asoc->sctp_cmt_on_off == 0) {
8639                                         if ((asoc->alternate) &&
8640                                             (asoc->alternate != net) &&
8641                                             (chk->whoTo == NULL)) {
8642                                                 continue;
8643                                         } else if ((net != asoc->primary_destination) &&
8644                                                     (asoc->alternate == NULL) &&
8645                                             (chk->whoTo == NULL)) {
8646                                                 continue;
8647                                         }
8648                                 }
8649                                 if ((chk->send_size > omtu) && ((chk->flags & CHUNK_FLAGS_FRAGMENT_OK) == 0)) {
8650                                         /*-
8651                                          * strange, we have a chunk that is
8652                                          * to big for its destination and
8653                                          * yet no fragment ok flag.
8654                                          * Something went wrong when the
8655                                          * PMTU changed...we did not mark
8656                                          * this chunk for some reason?? I
8657                                          * will fix it here by letting IP
8658                                          * fragment it for now and printing
8659                                          * a warning. This really should not
8660                                          * happen ...
8661                                          */
8662                                         SCTP_PRINTF("Warning chunk of %d bytes > mtu:%d and yet PMTU disc missed\n",
8663                                             chk->send_size, mtu);
8664                                         chk->flags |= CHUNK_FLAGS_FRAGMENT_OK;
8665                                 }
8666                                 if (SCTP_BASE_SYSCTL(sctp_enable_sack_immediately) &&
8667                                     ((asoc->state & SCTP_STATE_SHUTDOWN_PENDING) == SCTP_STATE_SHUTDOWN_PENDING)) {
8668                                         struct sctp_data_chunk *dchkh;
8669
8670                                         dchkh = mtod(chk->data, struct sctp_data_chunk *);
8671                                         dchkh->ch.chunk_flags |= SCTP_DATA_SACK_IMMEDIATELY;
8672                                 }
8673                                 if (((chk->send_size <= mtu) && (chk->send_size <= r_mtu)) ||
8674                                     ((chk->flags & CHUNK_FLAGS_FRAGMENT_OK) && (chk->send_size <= asoc->peers_rwnd))) {
8675                                         /* ok we will add this one */
8676
8677                                         /*
8678                                          * Add an AUTH chunk, if chunk
8679                                          * requires it, save the offset into
8680                                          * the chain for AUTH
8681                                          */
8682                                         if (data_auth_reqd) {
8683                                                 if (auth == NULL) {
8684                                                         outchain = sctp_add_auth_chunk(outchain,
8685                                                             &endoutchain,
8686                                                             &auth,
8687                                                             &auth_offset,
8688                                                             stcb,
8689                                                             SCTP_DATA);
8690                                                         auth_keyid = chk->auth_keyid;
8691                                                         override_ok = 0;
8692                                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8693                                                 } else if (override_ok) {
8694                                                         /*
8695                                                          * use this data's
8696                                                          * keyid
8697                                                          */
8698                                                         auth_keyid = chk->auth_keyid;
8699                                                         override_ok = 0;
8700                                                 } else if (auth_keyid != chk->auth_keyid) {
8701                                                         /*
8702                                                          * different keyid,
8703                                                          * so done bundling
8704                                                          */
8705                                                         break;
8706                                                 }
8707                                         }
8708                                         outchain = sctp_copy_mbufchain(chk->data, outchain, &endoutchain, 0,
8709                                             chk->send_size, chk->copy_by_ref);
8710                                         if (outchain == NULL) {
8711                                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "No memory?\n");
8712                                                 if (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
8713                                                         sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
8714                                                 }
8715                                                 *reason_code = 3;
8716                                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
8717                                                 return (ENOMEM);
8718                                         }
8719                                         /* upate our MTU size */
8720                                         /* Do clear IP_DF ? */
8721                                         if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
8722                                                 no_fragmentflg = 0;
8723                                         }
8724                                         /* unsigned subtraction of mtu */
8725                                         if (mtu > chk->send_size)
8726                                                 mtu -= chk->send_size;
8727                                         else
8728                                                 mtu = 0;
8729                                         /* unsigned subtraction of r_mtu */
8730                                         if (r_mtu > chk->send_size)
8731                                                 r_mtu -= chk->send_size;
8732                                         else
8733                                                 r_mtu = 0;
8734
8735                                         to_out += chk->send_size;
8736                                         if ((to_out > mx_mtu) && no_fragmentflg) {
8737 #ifdef INVARIANTS
8738                                                 panic("Exceeding mtu of %d out size is %d", mx_mtu, to_out);
8739 #else
8740                                                 SCTP_PRINTF("Exceeding mtu of %d out size is %d\n",
8741                                                     mx_mtu, to_out);
8742 #endif
8743                                         }
8744                                         chk->window_probe = 0;
8745                                         data_list[bundle_at++] = chk;
8746                                         if (bundle_at >= SCTP_MAX_DATA_BUNDLING) {
8747                                                 break;
8748                                         }
8749                                         if (chk->sent == SCTP_DATAGRAM_UNSENT) {
8750                                                 if ((chk->rec.data.rcv_flags & SCTP_DATA_UNORDERED) == 0) {
8751                                                         SCTP_STAT_INCR_COUNTER64(sctps_outorderchunks);
8752                                                 } else {
8753                                                         SCTP_STAT_INCR_COUNTER64(sctps_outunorderchunks);
8754                                                 }
8755                                                 if (((chk->rec.data.rcv_flags & SCTP_DATA_LAST_FRAG) == SCTP_DATA_LAST_FRAG) &&
8756                                                     ((chk->rec.data.rcv_flags & SCTP_DATA_FIRST_FRAG) == 0))
8757                                                         /*
8758                                                          * Count number of
8759                                                          * user msg's that
8760                                                          * were fragmented
8761                                                          * we do this by
8762                                                          * counting when we
8763                                                          * see a LAST
8764                                                          * fragment only.
8765                                                          */
8766                                                         SCTP_STAT_INCR_COUNTER64(sctps_fragusrmsgs);
8767                                         }
8768                                         if ((mtu == 0) || (r_mtu == 0) || (one_chunk)) {
8769                                                 if ((one_chunk) && (stcb->asoc.total_flight == 0)) {
8770                                                         data_list[0]->window_probe = 1;
8771                                                         net->window_probe = 1;
8772                                                 }
8773                                                 break;
8774                                         }
8775                                 } else {
8776                                         /*
8777                                          * Must be sent in order of the
8778                                          * TSN's (on a network)
8779                                          */
8780                                         break;
8781                                 }
8782                         }       /* for (chunk gather loop for this net) */
8783                 }               /* if asoc.state OPEN */
8784 no_data_fill:
8785                 /* Is there something to send for this destination? */
8786                 if (outchain) {
8787                         /* We may need to start a control timer or two */
8788                         if (asconf) {
8789                                 sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp,
8790                                     stcb, net);
8791                                 /*
8792                                  * do NOT clear the asconf flag as it is
8793                                  * used to do appropriate source address
8794                                  * selection.
8795                                  */
8796                         }
8797                         if (cookie) {
8798                                 sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, inp, stcb, net);
8799                                 cookie = 0;
8800                         }
8801                         /* must start a send timer if data is being sent */
8802                         if (bundle_at && (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer))) {
8803                                 /*
8804                                  * no timer running on this destination
8805                                  * restart it.
8806                                  */
8807                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
8808                         }
8809                         if (bundle_at || hbflag) {
8810                                 /* For data/asconf and hb set time */
8811                                 if (*now_filled == 0) {
8812                                         (void)SCTP_GETTIME_TIMEVAL(now);
8813                                         *now_filled = 1;
8814                                 }
8815                                 net->last_sent_time = *now;
8816                         }
8817                         /* Now send it, if there is anything to send :> */
8818                         if ((error = sctp_lowlevel_chunk_output(inp,
8819                             stcb,
8820                             net,
8821                             (struct sockaddr *)&net->ro._l_addr,
8822                             outchain,
8823                             auth_offset,
8824                             auth,
8825                             auth_keyid,
8826                             no_fragmentflg,
8827                             bundle_at,
8828                             asconf,
8829                             inp->sctp_lport, stcb->rport,
8830                             htonl(stcb->asoc.peer_vtag),
8831                             net->port, NULL,
8832                             0, 0,
8833                             so_locked))) {
8834                                 /* error, we could not output */
8835                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
8836                                 if (from_where == 0) {
8837                                         SCTP_STAT_INCR(sctps_lowlevelerrusr);
8838                                 }
8839                                 if (error == ENOBUFS) {
8840                                         asoc->ifp_had_enobuf = 1;
8841                                         SCTP_STAT_INCR(sctps_lowlevelerr);
8842                                 }
8843                                 if (error == EHOSTUNREACH) {
8844                                         /*
8845                                          * Destination went unreachable
8846                                          * during this send
8847                                          */
8848                                         sctp_move_chunks_from_net(stcb, net);
8849                                 }
8850                                 *reason_code = 6;
8851                                 /*-
8852                                  * I add this line to be paranoid. As far as
8853                                  * I can tell the continue, takes us back to
8854                                  * the top of the for, but just to make sure
8855                                  * I will reset these again here.
8856                                  */
8857                                 ctl_cnt = bundle_at = 0;
8858                                 continue;       /* This takes us back to the
8859                                                  * for() for the nets. */
8860                         } else {
8861                                 asoc->ifp_had_enobuf = 0;
8862                         }
8863                         endoutchain = NULL;
8864                         auth = NULL;
8865                         auth_offset = 0;
8866                         if (!no_out_cnt) {
8867                                 *num_out += (ctl_cnt + bundle_at);
8868                         }
8869                         if (bundle_at) {
8870                                 /* setup for a RTO measurement */
8871                                 tsns_sent = data_list[0]->rec.data.tsn;
8872                                 /* fill time if not already filled */
8873                                 if (*now_filled == 0) {
8874                                         (void)SCTP_GETTIME_TIMEVAL(&asoc->time_last_sent);
8875                                         *now_filled = 1;
8876                                         *now = asoc->time_last_sent;
8877                                 } else {
8878                                         asoc->time_last_sent = *now;
8879                                 }
8880                                 if (net->rto_needed) {
8881                                         data_list[0]->do_rtt = 1;
8882                                         net->rto_needed = 0;
8883                                 }
8884                                 SCTP_STAT_INCR_BY(sctps_senddata, bundle_at);
8885                                 sctp_clean_up_datalist(stcb, asoc, data_list, bundle_at, net);
8886                         }
8887                         if (one_chunk) {
8888                                 break;
8889                         }
8890                 }
8891                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
8892                         sctp_log_cwnd(stcb, net, tsns_sent, SCTP_CWND_LOG_FROM_SEND);
8893                 }
8894         }
8895         if (old_start_at == NULL) {
8896                 old_start_at = start_at;
8897                 start_at = TAILQ_FIRST(&asoc->nets);
8898                 if (old_start_at)
8899                         goto again_one_more_time;
8900         }
8901
8902         /*
8903          * At the end there should be no NON timed chunks hanging on this
8904          * queue.
8905          */
8906         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
8907                 sctp_log_cwnd(stcb, net, *num_out, SCTP_CWND_LOG_FROM_SEND);
8908         }
8909         if ((*num_out == 0) && (*reason_code == 0)) {
8910                 *reason_code = 4;
8911         } else {
8912                 *reason_code = 5;
8913         }
8914         sctp_clean_up_ctl(stcb, asoc, so_locked);
8915         return (0);
8916 }
8917
8918 void
8919 sctp_queue_op_err(struct sctp_tcb *stcb, struct mbuf *op_err)
8920 {
8921         /*-
8922          * Prepend a OPERATIONAL_ERROR chunk header and put on the end of
8923          * the control chunk queue.
8924          */
8925         struct sctp_chunkhdr *hdr;
8926         struct sctp_tmit_chunk *chk;
8927         struct mbuf *mat, *last_mbuf;
8928         uint32_t chunk_length;
8929         uint16_t padding_length;
8930
8931         SCTP_TCB_LOCK_ASSERT(stcb);
8932         SCTP_BUF_PREPEND(op_err, sizeof(struct sctp_chunkhdr), M_NOWAIT);
8933         if (op_err == NULL) {
8934                 return;
8935         }
8936         last_mbuf = NULL;
8937         chunk_length = 0;
8938         for (mat = op_err; mat != NULL; mat = SCTP_BUF_NEXT(mat)) {
8939                 chunk_length += SCTP_BUF_LEN(mat);
8940                 if (SCTP_BUF_NEXT(mat) == NULL) {
8941                         last_mbuf = mat;
8942                 }
8943         }
8944         if (chunk_length > SCTP_MAX_CHUNK_LENGTH) {
8945                 sctp_m_freem(op_err);
8946                 return;
8947         }
8948         padding_length = chunk_length % 4;
8949         if (padding_length != 0) {
8950                 padding_length = 4 - padding_length;
8951         }
8952         if (padding_length != 0) {
8953                 if (sctp_add_pad_tombuf(last_mbuf, padding_length) == NULL) {
8954                         sctp_m_freem(op_err);
8955                         return;
8956                 }
8957         }
8958         sctp_alloc_a_chunk(stcb, chk);
8959         if (chk == NULL) {
8960                 /* no memory */
8961                 sctp_m_freem(op_err);
8962                 return;
8963         }
8964         chk->copy_by_ref = 0;
8965         chk->send_size = (uint16_t)chunk_length;
8966         chk->sent = SCTP_DATAGRAM_UNSENT;
8967         chk->snd_count = 0;
8968         chk->asoc = &stcb->asoc;
8969         chk->data = op_err;
8970         chk->whoTo = NULL;
8971         chk->rec.chunk_id.id = SCTP_OPERATION_ERROR;
8972         chk->rec.chunk_id.can_take_data = 0;
8973         hdr = mtod(op_err, struct sctp_chunkhdr *);
8974         hdr->chunk_type = SCTP_OPERATION_ERROR;
8975         hdr->chunk_flags = 0;
8976         hdr->chunk_length = htons(chk->send_size);
8977         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
8978         chk->asoc->ctrl_queue_cnt++;
8979 }
8980
8981 int
8982 sctp_send_cookie_echo(struct mbuf *m,
8983     int offset,
8984     struct sctp_tcb *stcb,
8985     struct sctp_nets *net)
8986 {
8987         /*-
8988          * pull out the cookie and put it at the front of the control chunk
8989          * queue.
8990          */
8991         int at;
8992         struct mbuf *cookie;
8993         struct sctp_paramhdr param, *phdr;
8994         struct sctp_chunkhdr *hdr;
8995         struct sctp_tmit_chunk *chk;
8996         uint16_t ptype, plen;
8997
8998         SCTP_TCB_LOCK_ASSERT(stcb);
8999         /* First find the cookie in the param area */
9000         cookie = NULL;
9001         at = offset + sizeof(struct sctp_init_chunk);
9002         for (;;) {
9003                 phdr = sctp_get_next_param(m, at, &param, sizeof(param));
9004                 if (phdr == NULL) {
9005                         return (-3);
9006                 }
9007                 ptype = ntohs(phdr->param_type);
9008                 plen = ntohs(phdr->param_length);
9009                 if (ptype == SCTP_STATE_COOKIE) {
9010                         int pad;
9011
9012                         /* found the cookie */
9013                         if ((pad = (plen % 4))) {
9014                                 plen += 4 - pad;
9015                         }
9016                         cookie = SCTP_M_COPYM(m, at, plen, M_NOWAIT);
9017                         if (cookie == NULL) {
9018                                 /* No memory */
9019                                 return (-2);
9020                         }
9021 #ifdef SCTP_MBUF_LOGGING
9022                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
9023                                 sctp_log_mbc(cookie, SCTP_MBUF_ICOPY);
9024                         }
9025 #endif
9026                         break;
9027                 }
9028                 at += SCTP_SIZE32(plen);
9029         }
9030         /* ok, we got the cookie lets change it into a cookie echo chunk */
9031         /* first the change from param to cookie */
9032         hdr = mtod(cookie, struct sctp_chunkhdr *);
9033         hdr->chunk_type = SCTP_COOKIE_ECHO;
9034         hdr->chunk_flags = 0;
9035         /* get the chunk stuff now and place it in the FRONT of the queue */
9036         sctp_alloc_a_chunk(stcb, chk);
9037         if (chk == NULL) {
9038                 /* no memory */
9039                 sctp_m_freem(cookie);
9040                 return (-5);
9041         }
9042         chk->copy_by_ref = 0;
9043         chk->rec.chunk_id.id = SCTP_COOKIE_ECHO;
9044         chk->rec.chunk_id.can_take_data = 0;
9045         chk->flags = CHUNK_FLAGS_FRAGMENT_OK;
9046         chk->send_size = plen;
9047         chk->sent = SCTP_DATAGRAM_UNSENT;
9048         chk->snd_count = 0;
9049         chk->asoc = &stcb->asoc;
9050         chk->data = cookie;
9051         chk->whoTo = net;
9052         atomic_add_int(&chk->whoTo->ref_count, 1);
9053         TAILQ_INSERT_HEAD(&chk->asoc->control_send_queue, chk, sctp_next);
9054         chk->asoc->ctrl_queue_cnt++;
9055         return (0);
9056 }
9057
9058 void
9059 sctp_send_heartbeat_ack(struct sctp_tcb *stcb,
9060     struct mbuf *m,
9061     int offset,
9062     int chk_length,
9063     struct sctp_nets *net)
9064 {
9065         /*
9066          * take a HB request and make it into a HB ack and send it.
9067          */
9068         struct mbuf *outchain;
9069         struct sctp_chunkhdr *chdr;
9070         struct sctp_tmit_chunk *chk;
9071
9072
9073         if (net == NULL)
9074                 /* must have a net pointer */
9075                 return;
9076
9077         outchain = SCTP_M_COPYM(m, offset, chk_length, M_NOWAIT);
9078         if (outchain == NULL) {
9079                 /* gak out of memory */
9080                 return;
9081         }
9082 #ifdef SCTP_MBUF_LOGGING
9083         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
9084                 sctp_log_mbc(outchain, SCTP_MBUF_ICOPY);
9085         }
9086 #endif
9087         chdr = mtod(outchain, struct sctp_chunkhdr *);
9088         chdr->chunk_type = SCTP_HEARTBEAT_ACK;
9089         chdr->chunk_flags = 0;
9090         if (chk_length % 4) {
9091                 /* need pad */
9092                 uint32_t cpthis = 0;
9093                 int padlen;
9094
9095                 padlen = 4 - (chk_length % 4);
9096                 m_copyback(outchain, chk_length, padlen, (caddr_t)&cpthis);
9097         }
9098         sctp_alloc_a_chunk(stcb, chk);
9099         if (chk == NULL) {
9100                 /* no memory */
9101                 sctp_m_freem(outchain);
9102                 return;
9103         }
9104         chk->copy_by_ref = 0;
9105         chk->rec.chunk_id.id = SCTP_HEARTBEAT_ACK;
9106         chk->rec.chunk_id.can_take_data = 1;
9107         chk->flags = 0;
9108         chk->send_size = chk_length;
9109         chk->sent = SCTP_DATAGRAM_UNSENT;
9110         chk->snd_count = 0;
9111         chk->asoc = &stcb->asoc;
9112         chk->data = outchain;
9113         chk->whoTo = net;
9114         atomic_add_int(&chk->whoTo->ref_count, 1);
9115         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9116         chk->asoc->ctrl_queue_cnt++;
9117 }
9118
9119 void
9120 sctp_send_cookie_ack(struct sctp_tcb *stcb)
9121 {
9122         /* formulate and queue a cookie-ack back to sender */
9123         struct mbuf *cookie_ack;
9124         struct sctp_chunkhdr *hdr;
9125         struct sctp_tmit_chunk *chk;
9126
9127         SCTP_TCB_LOCK_ASSERT(stcb);
9128
9129         cookie_ack = sctp_get_mbuf_for_msg(sizeof(struct sctp_chunkhdr), 0, M_NOWAIT, 1, MT_HEADER);
9130         if (cookie_ack == NULL) {
9131                 /* no mbuf's */
9132                 return;
9133         }
9134         SCTP_BUF_RESV_UF(cookie_ack, SCTP_MIN_OVERHEAD);
9135         sctp_alloc_a_chunk(stcb, chk);
9136         if (chk == NULL) {
9137                 /* no memory */
9138                 sctp_m_freem(cookie_ack);
9139                 return;
9140         }
9141         chk->copy_by_ref = 0;
9142         chk->rec.chunk_id.id = SCTP_COOKIE_ACK;
9143         chk->rec.chunk_id.can_take_data = 1;
9144         chk->flags = 0;
9145         chk->send_size = sizeof(struct sctp_chunkhdr);
9146         chk->sent = SCTP_DATAGRAM_UNSENT;
9147         chk->snd_count = 0;
9148         chk->asoc = &stcb->asoc;
9149         chk->data = cookie_ack;
9150         if (chk->asoc->last_control_chunk_from != NULL) {
9151                 chk->whoTo = chk->asoc->last_control_chunk_from;
9152                 atomic_add_int(&chk->whoTo->ref_count, 1);
9153         } else {
9154                 chk->whoTo = NULL;
9155         }
9156         hdr = mtod(cookie_ack, struct sctp_chunkhdr *);
9157         hdr->chunk_type = SCTP_COOKIE_ACK;
9158         hdr->chunk_flags = 0;
9159         hdr->chunk_length = htons(chk->send_size);
9160         SCTP_BUF_LEN(cookie_ack) = chk->send_size;
9161         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9162         chk->asoc->ctrl_queue_cnt++;
9163         return;
9164 }
9165
9166
9167 void
9168 sctp_send_shutdown_ack(struct sctp_tcb *stcb, struct sctp_nets *net)
9169 {
9170         /* formulate and queue a SHUTDOWN-ACK back to the sender */
9171         struct mbuf *m_shutdown_ack;
9172         struct sctp_shutdown_ack_chunk *ack_cp;
9173         struct sctp_tmit_chunk *chk;
9174
9175         m_shutdown_ack = sctp_get_mbuf_for_msg(sizeof(struct sctp_shutdown_ack_chunk), 0, M_NOWAIT, 1, MT_HEADER);
9176         if (m_shutdown_ack == NULL) {
9177                 /* no mbuf's */
9178                 return;
9179         }
9180         SCTP_BUF_RESV_UF(m_shutdown_ack, SCTP_MIN_OVERHEAD);
9181         sctp_alloc_a_chunk(stcb, chk);
9182         if (chk == NULL) {
9183                 /* no memory */
9184                 sctp_m_freem(m_shutdown_ack);
9185                 return;
9186         }
9187         chk->copy_by_ref = 0;
9188         chk->rec.chunk_id.id = SCTP_SHUTDOWN_ACK;
9189         chk->rec.chunk_id.can_take_data = 1;
9190         chk->flags = 0;
9191         chk->send_size = sizeof(struct sctp_chunkhdr);
9192         chk->sent = SCTP_DATAGRAM_UNSENT;
9193         chk->snd_count = 0;
9194         chk->flags = 0;
9195         chk->asoc = &stcb->asoc;
9196         chk->data = m_shutdown_ack;
9197         chk->whoTo = net;
9198         if (chk->whoTo) {
9199                 atomic_add_int(&chk->whoTo->ref_count, 1);
9200         }
9201         ack_cp = mtod(m_shutdown_ack, struct sctp_shutdown_ack_chunk *);
9202         ack_cp->ch.chunk_type = SCTP_SHUTDOWN_ACK;
9203         ack_cp->ch.chunk_flags = 0;
9204         ack_cp->ch.chunk_length = htons(chk->send_size);
9205         SCTP_BUF_LEN(m_shutdown_ack) = chk->send_size;
9206         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9207         chk->asoc->ctrl_queue_cnt++;
9208         return;
9209 }
9210
9211 void
9212 sctp_send_shutdown(struct sctp_tcb *stcb, struct sctp_nets *net)
9213 {
9214         /* formulate and queue a SHUTDOWN to the sender */
9215         struct mbuf *m_shutdown;
9216         struct sctp_shutdown_chunk *shutdown_cp;
9217         struct sctp_tmit_chunk *chk;
9218
9219         TAILQ_FOREACH(chk, &stcb->asoc.control_send_queue, sctp_next) {
9220                 if (chk->rec.chunk_id.id == SCTP_SHUTDOWN) {
9221                         /* We already have a SHUTDOWN queued. Reuse it. */
9222                         if (chk->whoTo) {
9223                                 sctp_free_remote_addr(chk->whoTo);
9224                                 chk->whoTo = NULL;
9225                         }
9226                         break;
9227                 }
9228         }
9229         if (chk == NULL) {
9230                 m_shutdown = sctp_get_mbuf_for_msg(sizeof(struct sctp_shutdown_chunk), 0, M_NOWAIT, 1, MT_HEADER);
9231                 if (m_shutdown == NULL) {
9232                         /* no mbuf's */
9233                         return;
9234                 }
9235                 SCTP_BUF_RESV_UF(m_shutdown, SCTP_MIN_OVERHEAD);
9236                 sctp_alloc_a_chunk(stcb, chk);
9237                 if (chk == NULL) {
9238                         /* no memory */
9239                         sctp_m_freem(m_shutdown);
9240                         return;
9241                 }
9242                 chk->copy_by_ref = 0;
9243                 chk->rec.chunk_id.id = SCTP_SHUTDOWN;
9244                 chk->rec.chunk_id.can_take_data = 1;
9245                 chk->flags = 0;
9246                 chk->send_size = sizeof(struct sctp_shutdown_chunk);
9247                 chk->sent = SCTP_DATAGRAM_UNSENT;
9248                 chk->snd_count = 0;
9249                 chk->flags = 0;
9250                 chk->asoc = &stcb->asoc;
9251                 chk->data = m_shutdown;
9252                 chk->whoTo = net;
9253                 if (chk->whoTo) {
9254                         atomic_add_int(&chk->whoTo->ref_count, 1);
9255                 }
9256                 shutdown_cp = mtod(m_shutdown, struct sctp_shutdown_chunk *);
9257                 shutdown_cp->ch.chunk_type = SCTP_SHUTDOWN;
9258                 shutdown_cp->ch.chunk_flags = 0;
9259                 shutdown_cp->ch.chunk_length = htons(chk->send_size);
9260                 shutdown_cp->cumulative_tsn_ack = htonl(stcb->asoc.cumulative_tsn);
9261                 SCTP_BUF_LEN(m_shutdown) = chk->send_size;
9262                 TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9263                 chk->asoc->ctrl_queue_cnt++;
9264         } else {
9265                 TAILQ_REMOVE(&stcb->asoc.control_send_queue, chk, sctp_next);
9266                 chk->whoTo = net;
9267                 if (chk->whoTo) {
9268                         atomic_add_int(&chk->whoTo->ref_count, 1);
9269                 }
9270                 shutdown_cp = mtod(chk->data, struct sctp_shutdown_chunk *);
9271                 shutdown_cp->cumulative_tsn_ack = htonl(stcb->asoc.cumulative_tsn);
9272                 TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
9273         }
9274         return;
9275 }
9276
9277 void
9278 sctp_send_asconf(struct sctp_tcb *stcb, struct sctp_nets *net, int addr_locked)
9279 {
9280         /*
9281          * formulate and queue an ASCONF to the peer. ASCONF parameters
9282          * should be queued on the assoc queue.
9283          */
9284         struct sctp_tmit_chunk *chk;
9285         struct mbuf *m_asconf;
9286         int len;
9287
9288         SCTP_TCB_LOCK_ASSERT(stcb);
9289
9290         if ((!TAILQ_EMPTY(&stcb->asoc.asconf_send_queue)) &&
9291             (!sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_MULTIPLE_ASCONFS))) {
9292                 /* can't send a new one if there is one in flight already */
9293                 return;
9294         }
9295
9296         /* compose an ASCONF chunk, maximum length is PMTU */
9297         m_asconf = sctp_compose_asconf(stcb, &len, addr_locked);
9298         if (m_asconf == NULL) {
9299                 return;
9300         }
9301
9302         sctp_alloc_a_chunk(stcb, chk);
9303         if (chk == NULL) {
9304                 /* no memory */
9305                 sctp_m_freem(m_asconf);
9306                 return;
9307         }
9308
9309         chk->copy_by_ref = 0;
9310         chk->rec.chunk_id.id = SCTP_ASCONF;
9311         chk->rec.chunk_id.can_take_data = 0;
9312         chk->flags = CHUNK_FLAGS_FRAGMENT_OK;
9313         chk->data = m_asconf;
9314         chk->send_size = len;
9315         chk->sent = SCTP_DATAGRAM_UNSENT;
9316         chk->snd_count = 0;
9317         chk->asoc = &stcb->asoc;
9318         chk->whoTo = net;
9319         if (chk->whoTo) {
9320                 atomic_add_int(&chk->whoTo->ref_count, 1);
9321         }
9322         TAILQ_INSERT_TAIL(&chk->asoc->asconf_send_queue, chk, sctp_next);
9323         chk->asoc->ctrl_queue_cnt++;
9324         return;
9325 }
9326
9327 void
9328 sctp_send_asconf_ack(struct sctp_tcb *stcb)
9329 {
9330         /*
9331          * formulate and queue a asconf-ack back to sender. the asconf-ack
9332          * must be stored in the tcb.
9333          */
9334         struct sctp_tmit_chunk *chk;
9335         struct sctp_asconf_ack *ack, *latest_ack;
9336         struct mbuf *m_ack;
9337         struct sctp_nets *net = NULL;
9338
9339         SCTP_TCB_LOCK_ASSERT(stcb);
9340         /* Get the latest ASCONF-ACK */
9341         latest_ack = TAILQ_LAST(&stcb->asoc.asconf_ack_sent, sctp_asconf_ackhead);
9342         if (latest_ack == NULL) {
9343                 return;
9344         }
9345         if (latest_ack->last_sent_to != NULL &&
9346             latest_ack->last_sent_to == stcb->asoc.last_control_chunk_from) {
9347                 /* we're doing a retransmission */
9348                 net = sctp_find_alternate_net(stcb, stcb->asoc.last_control_chunk_from, 0);
9349                 if (net == NULL) {
9350                         /* no alternate */
9351                         if (stcb->asoc.last_control_chunk_from == NULL) {
9352                                 if (stcb->asoc.alternate) {
9353                                         net = stcb->asoc.alternate;
9354                                 } else {
9355                                         net = stcb->asoc.primary_destination;
9356                                 }
9357                         } else {
9358                                 net = stcb->asoc.last_control_chunk_from;
9359                         }
9360                 }
9361         } else {
9362                 /* normal case */
9363                 if (stcb->asoc.last_control_chunk_from == NULL) {
9364                         if (stcb->asoc.alternate) {
9365                                 net = stcb->asoc.alternate;
9366                         } else {
9367                                 net = stcb->asoc.primary_destination;
9368                         }
9369                 } else {
9370                         net = stcb->asoc.last_control_chunk_from;
9371                 }
9372         }
9373         latest_ack->last_sent_to = net;
9374
9375         TAILQ_FOREACH(ack, &stcb->asoc.asconf_ack_sent, next) {
9376                 if (ack->data == NULL) {
9377                         continue;
9378                 }
9379
9380                 /* copy the asconf_ack */
9381                 m_ack = SCTP_M_COPYM(ack->data, 0, M_COPYALL, M_NOWAIT);
9382                 if (m_ack == NULL) {
9383                         /* couldn't copy it */
9384                         return;
9385                 }
9386 #ifdef SCTP_MBUF_LOGGING
9387                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
9388                         sctp_log_mbc(m_ack, SCTP_MBUF_ICOPY);
9389                 }
9390 #endif
9391
9392                 sctp_alloc_a_chunk(stcb, chk);
9393                 if (chk == NULL) {
9394                         /* no memory */
9395                         if (m_ack)
9396                                 sctp_m_freem(m_ack);
9397                         return;
9398                 }
9399                 chk->copy_by_ref = 0;
9400                 chk->rec.chunk_id.id = SCTP_ASCONF_ACK;
9401                 chk->rec.chunk_id.can_take_data = 1;
9402                 chk->flags = CHUNK_FLAGS_FRAGMENT_OK;
9403                 chk->whoTo = net;
9404                 if (chk->whoTo) {
9405                         atomic_add_int(&chk->whoTo->ref_count, 1);
9406                 }
9407                 chk->data = m_ack;
9408                 chk->send_size = ack->len;
9409                 chk->sent = SCTP_DATAGRAM_UNSENT;
9410                 chk->snd_count = 0;
9411                 chk->asoc = &stcb->asoc;
9412
9413                 TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9414                 chk->asoc->ctrl_queue_cnt++;
9415         }
9416         return;
9417 }
9418
9419
9420 static int
9421 sctp_chunk_retransmission(struct sctp_inpcb *inp,
9422     struct sctp_tcb *stcb,
9423     struct sctp_association *asoc,
9424     int *cnt_out, struct timeval *now, int *now_filled, int *fr_done, int so_locked
9425 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
9426     SCTP_UNUSED
9427 #endif
9428 )
9429 {
9430         /*-
9431          * send out one MTU of retransmission. If fast_retransmit is
9432          * happening we ignore the cwnd. Otherwise we obey the cwnd and
9433          * rwnd. For a Cookie or Asconf in the control chunk queue we
9434          * retransmit them by themselves.
9435          *
9436          * For data chunks we will pick out the lowest TSN's in the sent_queue
9437          * marked for resend and bundle them all together (up to a MTU of
9438          * destination). The address to send to should have been
9439          * selected/changed where the retransmission was marked (i.e. in FR
9440          * or t3-timeout routines).
9441          */
9442         struct sctp_tmit_chunk *data_list[SCTP_MAX_DATA_BUNDLING];
9443         struct sctp_tmit_chunk *chk, *fwd;
9444         struct mbuf *m, *endofchain;
9445         struct sctp_nets *net = NULL;
9446         uint32_t tsns_sent = 0;
9447         int no_fragmentflg, bundle_at, cnt_thru;
9448         unsigned int mtu;
9449         int error, i, one_chunk, fwd_tsn, ctl_cnt, tmr_started;
9450         struct sctp_auth_chunk *auth = NULL;
9451         uint32_t auth_offset = 0;
9452         uint16_t auth_keyid;
9453         int override_ok = 1;
9454         int data_auth_reqd = 0;
9455         uint32_t dmtu = 0;
9456
9457         SCTP_TCB_LOCK_ASSERT(stcb);
9458         tmr_started = ctl_cnt = bundle_at = error = 0;
9459         no_fragmentflg = 1;
9460         fwd_tsn = 0;
9461         *cnt_out = 0;
9462         fwd = NULL;
9463         endofchain = m = NULL;
9464         auth_keyid = stcb->asoc.authinfo.active_keyid;
9465 #ifdef SCTP_AUDITING_ENABLED
9466         sctp_audit_log(0xC3, 1);
9467 #endif
9468         if ((TAILQ_EMPTY(&asoc->sent_queue)) &&
9469             (TAILQ_EMPTY(&asoc->control_send_queue))) {
9470                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "SCTP hits empty queue with cnt set to %d?\n",
9471                     asoc->sent_queue_retran_cnt);
9472                 asoc->sent_queue_cnt = 0;
9473                 asoc->sent_queue_cnt_removeable = 0;
9474                 /* send back 0/0 so we enter normal transmission */
9475                 *cnt_out = 0;
9476                 return (0);
9477         }
9478         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
9479                 if ((chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) ||
9480                     (chk->rec.chunk_id.id == SCTP_STREAM_RESET) ||
9481                     (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN)) {
9482                         if (chk->sent != SCTP_DATAGRAM_RESEND) {
9483                                 continue;
9484                         }
9485                         if (chk->rec.chunk_id.id == SCTP_STREAM_RESET) {
9486                                 if (chk != asoc->str_reset) {
9487                                         /*
9488                                          * not eligible for retran if its
9489                                          * not ours
9490                                          */
9491                                         continue;
9492                                 }
9493                         }
9494                         ctl_cnt++;
9495                         if (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN) {
9496                                 fwd_tsn = 1;
9497                         }
9498                         /*
9499                          * Add an AUTH chunk, if chunk requires it save the
9500                          * offset into the chain for AUTH
9501                          */
9502                         if ((auth == NULL) &&
9503                             (sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
9504                             stcb->asoc.peer_auth_chunks))) {
9505                                 m = sctp_add_auth_chunk(m, &endofchain,
9506                                     &auth, &auth_offset,
9507                                     stcb,
9508                                     chk->rec.chunk_id.id);
9509                                 SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
9510                         }
9511                         m = sctp_copy_mbufchain(chk->data, m, &endofchain, 0, chk->send_size, chk->copy_by_ref);
9512                         break;
9513                 }
9514         }
9515         one_chunk = 0;
9516         cnt_thru = 0;
9517         /* do we have control chunks to retransmit? */
9518         if (m != NULL) {
9519                 /* Start a timer no matter if we succeed or fail */
9520                 if (chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
9521                         sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, inp, stcb, chk->whoTo);
9522                 } else if (chk->rec.chunk_id.id == SCTP_ASCONF)
9523                         sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp, stcb, chk->whoTo);
9524                 chk->snd_count++;       /* update our count */
9525                 if ((error = sctp_lowlevel_chunk_output(inp, stcb, chk->whoTo,
9526                     (struct sockaddr *)&chk->whoTo->ro._l_addr, m,
9527                     auth_offset, auth, stcb->asoc.authinfo.active_keyid,
9528                     no_fragmentflg, 0, 0,
9529                     inp->sctp_lport, stcb->rport, htonl(stcb->asoc.peer_vtag),
9530                     chk->whoTo->port, NULL,
9531                     0, 0,
9532                     so_locked))) {
9533                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
9534                         if (error == ENOBUFS) {
9535                                 asoc->ifp_had_enobuf = 1;
9536                                 SCTP_STAT_INCR(sctps_lowlevelerr);
9537                         }
9538                         return (error);
9539                 } else {
9540                         asoc->ifp_had_enobuf = 0;
9541                 }
9542                 endofchain = NULL;
9543                 auth = NULL;
9544                 auth_offset = 0;
9545                 /*
9546                  * We don't want to mark the net->sent time here since this
9547                  * we use this for HB and retrans cannot measure RTT
9548                  */
9549                 /* (void)SCTP_GETTIME_TIMEVAL(&chk->whoTo->last_sent_time); */
9550                 *cnt_out += 1;
9551                 chk->sent = SCTP_DATAGRAM_SENT;
9552                 sctp_ucount_decr(stcb->asoc.sent_queue_retran_cnt);
9553                 if (fwd_tsn == 0) {
9554                         return (0);
9555                 } else {
9556                         /* Clean up the fwd-tsn list */
9557                         sctp_clean_up_ctl(stcb, asoc, so_locked);
9558                         return (0);
9559                 }
9560         }
9561         /*
9562          * Ok, it is just data retransmission we need to do or that and a
9563          * fwd-tsn with it all.
9564          */
9565         if (TAILQ_EMPTY(&asoc->sent_queue)) {
9566                 return (SCTP_RETRAN_DONE);
9567         }
9568         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED) ||
9569             (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT)) {
9570                 /* not yet open, resend the cookie and that is it */
9571                 return (1);
9572         }
9573 #ifdef SCTP_AUDITING_ENABLED
9574         sctp_auditing(20, inp, stcb, NULL);
9575 #endif
9576         data_auth_reqd = sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks);
9577         TAILQ_FOREACH(chk, &asoc->sent_queue, sctp_next) {
9578                 if (chk->sent != SCTP_DATAGRAM_RESEND) {
9579                         /* No, not sent to this net or not ready for rtx */
9580                         continue;
9581                 }
9582                 if (chk->data == NULL) {
9583                         SCTP_PRINTF("TSN:%x chk->snd_count:%d chk->sent:%d can't retran - no data\n",
9584                             chk->rec.data.tsn, chk->snd_count, chk->sent);
9585                         continue;
9586                 }
9587                 if ((SCTP_BASE_SYSCTL(sctp_max_retran_chunk)) &&
9588                     (chk->snd_count >= SCTP_BASE_SYSCTL(sctp_max_retran_chunk))) {
9589                         struct mbuf *op_err;
9590                         char msg[SCTP_DIAG_INFO_LEN];
9591
9592                         snprintf(msg, sizeof(msg), "TSN %8.8x retransmitted %d times, giving up",
9593                             chk->rec.data.tsn, chk->snd_count);
9594                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
9595                             msg);
9596                         atomic_add_int(&stcb->asoc.refcnt, 1);
9597                         sctp_abort_an_association(stcb->sctp_ep, stcb, op_err,
9598                             so_locked);
9599                         SCTP_TCB_LOCK(stcb);
9600                         atomic_subtract_int(&stcb->asoc.refcnt, 1);
9601                         return (SCTP_RETRAN_EXIT);
9602                 }
9603                 /* pick up the net */
9604                 net = chk->whoTo;
9605                 switch (net->ro._l_addr.sa.sa_family) {
9606 #ifdef INET
9607                 case AF_INET:
9608                         mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
9609                         break;
9610 #endif
9611 #ifdef INET6
9612                 case AF_INET6:
9613                         mtu = net->mtu - SCTP_MIN_OVERHEAD;
9614                         break;
9615 #endif
9616                 default:
9617                         /* TSNH */
9618                         mtu = net->mtu;
9619                         break;
9620                 }
9621
9622                 if ((asoc->peers_rwnd < mtu) && (asoc->total_flight > 0)) {
9623                         /* No room in peers rwnd */
9624                         uint32_t tsn;
9625
9626                         tsn = asoc->last_acked_seq + 1;
9627                         if (tsn == chk->rec.data.tsn) {
9628                                 /*
9629                                  * we make a special exception for this
9630                                  * case. The peer has no rwnd but is missing
9631                                  * the lowest chunk.. which is probably what
9632                                  * is holding up the rwnd.
9633                                  */
9634                                 goto one_chunk_around;
9635                         }
9636                         return (1);
9637                 }
9638 one_chunk_around:
9639                 if (asoc->peers_rwnd < mtu) {
9640                         one_chunk = 1;
9641                         if ((asoc->peers_rwnd == 0) &&
9642                             (asoc->total_flight == 0)) {
9643                                 chk->window_probe = 1;
9644                                 chk->whoTo->window_probe = 1;
9645                         }
9646                 }
9647 #ifdef SCTP_AUDITING_ENABLED
9648                 sctp_audit_log(0xC3, 2);
9649 #endif
9650                 bundle_at = 0;
9651                 m = NULL;
9652                 net->fast_retran_ip = 0;
9653                 if (chk->rec.data.doing_fast_retransmit == 0) {
9654                         /*
9655                          * if no FR in progress skip destination that have
9656                          * flight_size > cwnd.
9657                          */
9658                         if (net->flight_size >= net->cwnd) {
9659                                 continue;
9660                         }
9661                 } else {
9662                         /*
9663                          * Mark the destination net to have FR recovery
9664                          * limits put on it.
9665                          */
9666                         *fr_done = 1;
9667                         net->fast_retran_ip = 1;
9668                 }
9669
9670                 /*
9671                  * if no AUTH is yet included and this chunk requires it,
9672                  * make sure to account for it.  We don't apply the size
9673                  * until the AUTH chunk is actually added below in case
9674                  * there is no room for this chunk.
9675                  */
9676                 if (data_auth_reqd && (auth == NULL)) {
9677                         dmtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
9678                 } else
9679                         dmtu = 0;
9680
9681                 if ((chk->send_size <= (mtu - dmtu)) ||
9682                     (chk->flags & CHUNK_FLAGS_FRAGMENT_OK)) {
9683                         /* ok we will add this one */
9684                         if (data_auth_reqd) {
9685                                 if (auth == NULL) {
9686                                         m = sctp_add_auth_chunk(m,
9687                                             &endofchain,
9688                                             &auth,
9689                                             &auth_offset,
9690                                             stcb,
9691                                             SCTP_DATA);
9692                                         auth_keyid = chk->auth_keyid;
9693                                         override_ok = 0;
9694                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
9695                                 } else if (override_ok) {
9696                                         auth_keyid = chk->auth_keyid;
9697                                         override_ok = 0;
9698                                 } else if (chk->auth_keyid != auth_keyid) {
9699                                         /* different keyid, so done bundling */
9700                                         break;
9701                                 }
9702                         }
9703                         m = sctp_copy_mbufchain(chk->data, m, &endofchain, 0, chk->send_size, chk->copy_by_ref);
9704                         if (m == NULL) {
9705                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
9706                                 return (ENOMEM);
9707                         }
9708                         /* Do clear IP_DF ? */
9709                         if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
9710                                 no_fragmentflg = 0;
9711                         }
9712                         /* upate our MTU size */
9713                         if (mtu > (chk->send_size + dmtu))
9714                                 mtu -= (chk->send_size + dmtu);
9715                         else
9716                                 mtu = 0;
9717                         data_list[bundle_at++] = chk;
9718                         if (one_chunk && (asoc->total_flight <= 0)) {
9719                                 SCTP_STAT_INCR(sctps_windowprobed);
9720                         }
9721                 }
9722                 if (one_chunk == 0) {
9723                         /*
9724                          * now are there anymore forward from chk to pick
9725                          * up?
9726                          */
9727                         for (fwd = TAILQ_NEXT(chk, sctp_next); fwd != NULL; fwd = TAILQ_NEXT(fwd, sctp_next)) {
9728                                 if (fwd->sent != SCTP_DATAGRAM_RESEND) {
9729                                         /* Nope, not for retran */
9730                                         continue;
9731                                 }
9732                                 if (fwd->whoTo != net) {
9733                                         /* Nope, not the net in question */
9734                                         continue;
9735                                 }
9736                                 if (data_auth_reqd && (auth == NULL)) {
9737                                         dmtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
9738                                 } else
9739                                         dmtu = 0;
9740                                 if (fwd->send_size <= (mtu - dmtu)) {
9741                                         if (data_auth_reqd) {
9742                                                 if (auth == NULL) {
9743                                                         m = sctp_add_auth_chunk(m,
9744                                                             &endofchain,
9745                                                             &auth,
9746                                                             &auth_offset,
9747                                                             stcb,
9748                                                             SCTP_DATA);
9749                                                         auth_keyid = fwd->auth_keyid;
9750                                                         override_ok = 0;
9751                                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
9752                                                 } else if (override_ok) {
9753                                                         auth_keyid = fwd->auth_keyid;
9754                                                         override_ok = 0;
9755                                                 } else if (fwd->auth_keyid != auth_keyid) {
9756                                                         /*
9757                                                          * different keyid,
9758                                                          * so done bundling
9759                                                          */
9760                                                         break;
9761                                                 }
9762                                         }
9763                                         m = sctp_copy_mbufchain(fwd->data, m, &endofchain, 0, fwd->send_size, fwd->copy_by_ref);
9764                                         if (m == NULL) {
9765                                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
9766                                                 return (ENOMEM);
9767                                         }
9768                                         /* Do clear IP_DF ? */
9769                                         if (fwd->flags & CHUNK_FLAGS_FRAGMENT_OK) {
9770                                                 no_fragmentflg = 0;
9771                                         }
9772                                         /* upate our MTU size */
9773                                         if (mtu > (fwd->send_size + dmtu))
9774                                                 mtu -= (fwd->send_size + dmtu);
9775                                         else
9776                                                 mtu = 0;
9777                                         data_list[bundle_at++] = fwd;
9778                                         if (bundle_at >= SCTP_MAX_DATA_BUNDLING) {
9779                                                 break;
9780                                         }
9781                                 } else {
9782                                         /* can't fit so we are done */
9783                                         break;
9784                                 }
9785                         }
9786                 }
9787                 /* Is there something to send for this destination? */
9788                 if (m) {
9789                         /*
9790                          * No matter if we fail/or succeed we should start a
9791                          * timer. A failure is like a lost IP packet :-)
9792                          */
9793                         if (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
9794                                 /*
9795                                  * no timer running on this destination
9796                                  * restart it.
9797                                  */
9798                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
9799                                 tmr_started = 1;
9800                         }
9801                         /* Now lets send it, if there is anything to send :> */
9802                         if ((error = sctp_lowlevel_chunk_output(inp, stcb, net,
9803                             (struct sockaddr *)&net->ro._l_addr, m,
9804                             auth_offset, auth, auth_keyid,
9805                             no_fragmentflg, 0, 0,
9806                             inp->sctp_lport, stcb->rport, htonl(stcb->asoc.peer_vtag),
9807                             net->port, NULL,
9808                             0, 0,
9809                             so_locked))) {
9810                                 /* error, we could not output */
9811                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
9812                                 if (error == ENOBUFS) {
9813                                         asoc->ifp_had_enobuf = 1;
9814                                         SCTP_STAT_INCR(sctps_lowlevelerr);
9815                                 }
9816                                 return (error);
9817                         } else {
9818                                 asoc->ifp_had_enobuf = 0;
9819                         }
9820                         endofchain = NULL;
9821                         auth = NULL;
9822                         auth_offset = 0;
9823                         /* For HB's */
9824                         /*
9825                          * We don't want to mark the net->sent time here
9826                          * since this we use this for HB and retrans cannot
9827                          * measure RTT
9828                          */
9829                         /* (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time); */
9830
9831                         /* For auto-close */
9832                         cnt_thru++;
9833                         if (*now_filled == 0) {
9834                                 (void)SCTP_GETTIME_TIMEVAL(&asoc->time_last_sent);
9835                                 *now = asoc->time_last_sent;
9836                                 *now_filled = 1;
9837                         } else {
9838                                 asoc->time_last_sent = *now;
9839                         }
9840                         *cnt_out += bundle_at;
9841 #ifdef SCTP_AUDITING_ENABLED
9842                         sctp_audit_log(0xC4, bundle_at);
9843 #endif
9844                         if (bundle_at) {
9845                                 tsns_sent = data_list[0]->rec.data.tsn;
9846                         }
9847                         for (i = 0; i < bundle_at; i++) {
9848                                 SCTP_STAT_INCR(sctps_sendretransdata);
9849                                 data_list[i]->sent = SCTP_DATAGRAM_SENT;
9850                                 /*
9851                                  * When we have a revoked data, and we
9852                                  * retransmit it, then we clear the revoked
9853                                  * flag since this flag dictates if we
9854                                  * subtracted from the fs
9855                                  */
9856                                 if (data_list[i]->rec.data.chunk_was_revoked) {
9857                                         /* Deflate the cwnd */
9858                                         data_list[i]->whoTo->cwnd -= data_list[i]->book_size;
9859                                         data_list[i]->rec.data.chunk_was_revoked = 0;
9860                                 }
9861                                 data_list[i]->snd_count++;
9862                                 sctp_ucount_decr(asoc->sent_queue_retran_cnt);
9863                                 /* record the time */
9864                                 data_list[i]->sent_rcv_time = asoc->time_last_sent;
9865                                 if (data_list[i]->book_size_scale) {
9866                                         /*
9867                                          * need to double the book size on
9868                                          * this one
9869                                          */
9870                                         data_list[i]->book_size_scale = 0;
9871                                         /*
9872                                          * Since we double the booksize, we
9873                                          * must also double the output queue
9874                                          * size, since this get shrunk when
9875                                          * we free by this amount.
9876                                          */
9877                                         atomic_add_int(&((asoc)->total_output_queue_size), data_list[i]->book_size);
9878                                         data_list[i]->book_size *= 2;
9879
9880
9881                                 } else {
9882                                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_RWND_ENABLE) {
9883                                                 sctp_log_rwnd(SCTP_DECREASE_PEER_RWND,
9884                                                     asoc->peers_rwnd, data_list[i]->send_size, SCTP_BASE_SYSCTL(sctp_peer_chunk_oh));
9885                                         }
9886                                         asoc->peers_rwnd = sctp_sbspace_sub(asoc->peers_rwnd,
9887                                             (uint32_t)(data_list[i]->send_size +
9888                                             SCTP_BASE_SYSCTL(sctp_peer_chunk_oh)));
9889                                 }
9890                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
9891                                         sctp_misc_ints(SCTP_FLIGHT_LOG_UP_RSND,
9892                                             data_list[i]->whoTo->flight_size,
9893                                             data_list[i]->book_size,
9894                                             (uint32_t)(uintptr_t)data_list[i]->whoTo,
9895                                             data_list[i]->rec.data.tsn);
9896                                 }
9897                                 sctp_flight_size_increase(data_list[i]);
9898                                 sctp_total_flight_increase(stcb, data_list[i]);
9899                                 if (asoc->peers_rwnd < stcb->sctp_ep->sctp_ep.sctp_sws_sender) {
9900                                         /* SWS sender side engages */
9901                                         asoc->peers_rwnd = 0;
9902                                 }
9903                                 if ((i == 0) &&
9904                                     (data_list[i]->rec.data.doing_fast_retransmit)) {
9905                                         SCTP_STAT_INCR(sctps_sendfastretrans);
9906                                         if ((data_list[i] == TAILQ_FIRST(&asoc->sent_queue)) &&
9907                                             (tmr_started == 0)) {
9908                                                 /*-
9909                                                  * ok we just fast-retrans'd
9910                                                  * the lowest TSN, i.e the
9911                                                  * first on the list. In
9912                                                  * this case we want to give
9913                                                  * some more time to get a
9914                                                  * SACK back without a
9915                                                  * t3-expiring.
9916                                                  */
9917                                                 sctp_timer_stop(SCTP_TIMER_TYPE_SEND, inp, stcb, net,
9918                                                     SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_2);
9919                                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
9920                                         }
9921                                 }
9922                         }
9923                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
9924                                 sctp_log_cwnd(stcb, net, tsns_sent, SCTP_CWND_LOG_FROM_RESEND);
9925                         }
9926 #ifdef SCTP_AUDITING_ENABLED
9927                         sctp_auditing(21, inp, stcb, NULL);
9928 #endif
9929                 } else {
9930                         /* None will fit */
9931                         return (1);
9932                 }
9933                 if (asoc->sent_queue_retran_cnt <= 0) {
9934                         /* all done we have no more to retran */
9935                         asoc->sent_queue_retran_cnt = 0;
9936                         break;
9937                 }
9938                 if (one_chunk) {
9939                         /* No more room in rwnd */
9940                         return (1);
9941                 }
9942                 /* stop the for loop here. we sent out a packet */
9943                 break;
9944         }
9945         return (0);
9946 }
9947
9948 static void
9949 sctp_timer_validation(struct sctp_inpcb *inp,
9950     struct sctp_tcb *stcb,
9951     struct sctp_association *asoc)
9952 {
9953         struct sctp_nets *net;
9954
9955         /* Validate that a timer is running somewhere */
9956         TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
9957                 if (SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
9958                         /* Here is a timer */
9959                         return;
9960                 }
9961         }
9962         SCTP_TCB_LOCK_ASSERT(stcb);
9963         /* Gak, we did not have a timer somewhere */
9964         SCTPDBG(SCTP_DEBUG_OUTPUT3, "Deadlock avoided starting timer on a dest at retran\n");
9965         if (asoc->alternate) {
9966                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, asoc->alternate);
9967         } else {
9968                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, asoc->primary_destination);
9969         }
9970         return;
9971 }
9972
9973 void
9974 sctp_chunk_output(struct sctp_inpcb *inp,
9975     struct sctp_tcb *stcb,
9976     int from_where,
9977     int so_locked
9978 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
9979     SCTP_UNUSED
9980 #endif
9981 )
9982 {
9983         /*-
9984          * Ok this is the generic chunk service queue. we must do the
9985          * following:
9986          * - See if there are retransmits pending, if so we must
9987          *   do these first.
9988          * - Service the stream queue that is next, moving any
9989          *   message (note I must get a complete message i.e.
9990          *   FIRST/MIDDLE and LAST to the out queue in one pass) and assigning
9991          *   TSN's
9992          * - Check to see if the cwnd/rwnd allows any output, if so we
9993          *   go ahead and fomulate and send the low level chunks. Making sure
9994          *   to combine any control in the control chunk queue also.
9995          */
9996         struct sctp_association *asoc;
9997         struct sctp_nets *net;
9998         int error = 0, num_out, tot_out = 0, ret = 0, reason_code;
9999         unsigned int burst_cnt = 0;
10000         struct timeval now;
10001         int now_filled = 0;
10002         int nagle_on;
10003         int frag_point = sctp_get_frag_point(stcb, &stcb->asoc);
10004         int un_sent = 0;
10005         int fr_done;
10006         unsigned int tot_frs = 0;
10007
10008         asoc = &stcb->asoc;
10009 do_it_again:
10010         /* The Nagle algorithm is only applied when handling a send call. */
10011         if (from_where == SCTP_OUTPUT_FROM_USR_SEND) {
10012                 if (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_NODELAY)) {
10013                         nagle_on = 0;
10014                 } else {
10015                         nagle_on = 1;
10016                 }
10017         } else {
10018                 nagle_on = 0;
10019         }
10020         SCTP_TCB_LOCK_ASSERT(stcb);
10021
10022         un_sent = (stcb->asoc.total_output_queue_size - stcb->asoc.total_flight);
10023
10024         if ((un_sent <= 0) &&
10025             (TAILQ_EMPTY(&asoc->control_send_queue)) &&
10026             (TAILQ_EMPTY(&asoc->asconf_send_queue)) &&
10027             (asoc->sent_queue_retran_cnt == 0) &&
10028             (asoc->trigger_reset == 0)) {
10029                 /* Nothing to do unless there is something to be sent left */
10030                 return;
10031         }
10032         /*
10033          * Do we have something to send, data or control AND a sack timer
10034          * running, if so piggy-back the sack.
10035          */
10036         if (SCTP_OS_TIMER_PENDING(&stcb->asoc.dack_timer.timer)) {
10037                 sctp_send_sack(stcb, so_locked);
10038                 (void)SCTP_OS_TIMER_STOP(&stcb->asoc.dack_timer.timer);
10039         }
10040         while (asoc->sent_queue_retran_cnt) {
10041                 /*-
10042                  * Ok, it is retransmission time only, we send out only ONE
10043                  * packet with a single call off to the retran code.
10044                  */
10045                 if (from_where == SCTP_OUTPUT_FROM_COOKIE_ACK) {
10046                         /*-
10047                          * Special hook for handling cookiess discarded
10048                          * by peer that carried data. Send cookie-ack only
10049                          * and then the next call with get the retran's.
10050                          */
10051                         (void)sctp_med_chunk_output(inp, stcb, asoc, &num_out, &reason_code, 1,
10052                             from_where,
10053                             &now, &now_filled, frag_point, so_locked);
10054                         return;
10055                 } else if (from_where != SCTP_OUTPUT_FROM_HB_TMR) {
10056                         /* if its not from a HB then do it */
10057                         fr_done = 0;
10058                         ret = sctp_chunk_retransmission(inp, stcb, asoc, &num_out, &now, &now_filled, &fr_done, so_locked);
10059                         if (fr_done) {
10060                                 tot_frs++;
10061                         }
10062                 } else {
10063                         /*
10064                          * its from any other place, we don't allow retran
10065                          * output (only control)
10066                          */
10067                         ret = 1;
10068                 }
10069                 if (ret > 0) {
10070                         /* Can't send anymore */
10071                         /*-
10072                          * now lets push out control by calling med-level
10073                          * output once. this assures that we WILL send HB's
10074                          * if queued too.
10075                          */
10076                         (void)sctp_med_chunk_output(inp, stcb, asoc, &num_out, &reason_code, 1,
10077                             from_where,
10078                             &now, &now_filled, frag_point, so_locked);
10079 #ifdef SCTP_AUDITING_ENABLED
10080                         sctp_auditing(8, inp, stcb, NULL);
10081 #endif
10082                         sctp_timer_validation(inp, stcb, asoc);
10083                         return;
10084                 }
10085                 if (ret < 0) {
10086                         /*-
10087                          * The count was off.. retran is not happening so do
10088                          * the normal retransmission.
10089                          */
10090 #ifdef SCTP_AUDITING_ENABLED
10091                         sctp_auditing(9, inp, stcb, NULL);
10092 #endif
10093                         if (ret == SCTP_RETRAN_EXIT) {
10094                                 return;
10095                         }
10096                         break;
10097                 }
10098                 if (from_where == SCTP_OUTPUT_FROM_T3) {
10099                         /* Only one transmission allowed out of a timeout */
10100 #ifdef SCTP_AUDITING_ENABLED
10101                         sctp_auditing(10, inp, stcb, NULL);
10102 #endif
10103                         /* Push out any control */
10104                         (void)sctp_med_chunk_output(inp, stcb, asoc, &num_out, &reason_code, 1, from_where,
10105                             &now, &now_filled, frag_point, so_locked);
10106                         return;
10107                 }
10108                 if ((asoc->fr_max_burst > 0) && (tot_frs >= asoc->fr_max_burst)) {
10109                         /* Hit FR burst limit */
10110                         return;
10111                 }
10112                 if ((num_out == 0) && (ret == 0)) {
10113                         /* No more retrans to send */
10114                         break;
10115                 }
10116         }
10117 #ifdef SCTP_AUDITING_ENABLED
10118         sctp_auditing(12, inp, stcb, NULL);
10119 #endif
10120         /* Check for bad destinations, if they exist move chunks around. */
10121         TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
10122                 if (!(net->dest_state & SCTP_ADDR_REACHABLE)) {
10123                         /*-
10124                          * if possible move things off of this address we
10125                          * still may send below due to the dormant state but
10126                          * we try to find an alternate address to send to
10127                          * and if we have one we move all queued data on the
10128                          * out wheel to this alternate address.
10129                          */
10130                         if (net->ref_count > 1)
10131                                 sctp_move_chunks_from_net(stcb, net);
10132                 } else {
10133                         /*-
10134                          * if ((asoc->sat_network) || (net->addr_is_local))
10135                          * { burst_limit = asoc->max_burst *
10136                          * SCTP_SAT_NETWORK_BURST_INCR; }
10137                          */
10138                         if (asoc->max_burst > 0) {
10139                                 if (SCTP_BASE_SYSCTL(sctp_use_cwnd_based_maxburst)) {
10140                                         if ((net->flight_size + (asoc->max_burst * net->mtu)) < net->cwnd) {
10141                                                 /*
10142                                                  * JRS - Use the congestion
10143                                                  * control given in the
10144                                                  * congestion control module
10145                                                  */
10146                                                 asoc->cc_functions.sctp_cwnd_update_after_output(stcb, net, asoc->max_burst);
10147                                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_MAXBURST_ENABLE) {
10148                                                         sctp_log_maxburst(stcb, net, 0, asoc->max_burst, SCTP_MAX_BURST_APPLIED);
10149                                                 }
10150                                                 SCTP_STAT_INCR(sctps_maxburstqueued);
10151                                         }
10152                                         net->fast_retran_ip = 0;
10153                                 } else {
10154                                         if (net->flight_size == 0) {
10155                                                 /*
10156                                                  * Should be decaying the
10157                                                  * cwnd here
10158                                                  */
10159                                                 ;
10160                                         }
10161                                 }
10162                         }
10163                 }
10164
10165         }
10166         burst_cnt = 0;
10167         do {
10168                 error = sctp_med_chunk_output(inp, stcb, asoc, &num_out,
10169                     &reason_code, 0, from_where,
10170                     &now, &now_filled, frag_point, so_locked);
10171                 if (error) {
10172                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Error %d was returned from med-c-op\n", error);
10173                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_MAXBURST_ENABLE) {
10174                                 sctp_log_maxburst(stcb, asoc->primary_destination, error, burst_cnt, SCTP_MAX_BURST_ERROR_STOP);
10175                         }
10176                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
10177                                 sctp_log_cwnd(stcb, NULL, error, SCTP_SEND_NOW_COMPLETES);
10178                                 sctp_log_cwnd(stcb, NULL, 0xdeadbeef, SCTP_SEND_NOW_COMPLETES);
10179                         }
10180                         break;
10181                 }
10182                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "m-c-o put out %d\n", num_out);
10183
10184                 tot_out += num_out;
10185                 burst_cnt++;
10186                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
10187                         sctp_log_cwnd(stcb, NULL, num_out, SCTP_SEND_NOW_COMPLETES);
10188                         if (num_out == 0) {
10189                                 sctp_log_cwnd(stcb, NULL, reason_code, SCTP_SEND_NOW_COMPLETES);
10190                         }
10191                 }
10192                 if (nagle_on) {
10193                         /*
10194                          * When the Nagle algorithm is used, look at how
10195                          * much is unsent, then if its smaller than an MTU
10196                          * and we have data in flight we stop, except if we
10197                          * are handling a fragmented user message.
10198                          */
10199                         un_sent = stcb->asoc.total_output_queue_size - stcb->asoc.total_flight;
10200                         if ((un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD)) &&
10201                             (stcb->asoc.total_flight > 0)) {
10202 /*      &&                   sctp_is_feature_on(inp, SCTP_PCB_FLAGS_EXPLICIT_EOR))) {*/
10203                                 break;
10204                         }
10205                 }
10206                 if (TAILQ_EMPTY(&asoc->control_send_queue) &&
10207                     TAILQ_EMPTY(&asoc->send_queue) &&
10208                     sctp_is_there_unsent_data(stcb, so_locked) == 0) {
10209                         /* Nothing left to send */
10210                         break;
10211                 }
10212                 if ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) <= 0) {
10213                         /* Nothing left to send */
10214                         break;
10215                 }
10216         } while (num_out &&
10217             ((asoc->max_burst == 0) ||
10218             SCTP_BASE_SYSCTL(sctp_use_cwnd_based_maxburst) ||
10219             (burst_cnt < asoc->max_burst)));
10220
10221         if (SCTP_BASE_SYSCTL(sctp_use_cwnd_based_maxburst) == 0) {
10222                 if ((asoc->max_burst > 0) && (burst_cnt >= asoc->max_burst)) {
10223                         SCTP_STAT_INCR(sctps_maxburstqueued);
10224                         asoc->burst_limit_applied = 1;
10225                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_MAXBURST_ENABLE) {
10226                                 sctp_log_maxburst(stcb, asoc->primary_destination, 0, burst_cnt, SCTP_MAX_BURST_APPLIED);
10227                         }
10228                 } else {
10229                         asoc->burst_limit_applied = 0;
10230                 }
10231         }
10232         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
10233                 sctp_log_cwnd(stcb, NULL, tot_out, SCTP_SEND_NOW_COMPLETES);
10234         }
10235         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Ok, we have put out %d chunks\n",
10236             tot_out);
10237
10238         /*-
10239          * Now we need to clean up the control chunk chain if a ECNE is on
10240          * it. It must be marked as UNSENT again so next call will continue
10241          * to send it until such time that we get a CWR, to remove it.
10242          */
10243         if (stcb->asoc.ecn_echo_cnt_onq)
10244                 sctp_fix_ecn_echo(asoc);
10245
10246         if (stcb->asoc.trigger_reset) {
10247                 if (sctp_send_stream_reset_out_if_possible(stcb, so_locked) == 0) {
10248                         goto do_it_again;
10249                 }
10250         }
10251         return;
10252 }
10253
10254
10255 int
10256 sctp_output(
10257     struct sctp_inpcb *inp,
10258     struct mbuf *m,
10259     struct sockaddr *addr,
10260     struct mbuf *control,
10261     struct thread *p,
10262     int flags)
10263 {
10264         if (inp == NULL) {
10265                 SCTP_LTRACE_ERR_RET_PKT(m, inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
10266                 return (EINVAL);
10267         }
10268
10269         if (inp->sctp_socket == NULL) {
10270                 SCTP_LTRACE_ERR_RET_PKT(m, inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
10271                 return (EINVAL);
10272         }
10273         return (sctp_sosend(inp->sctp_socket,
10274             addr,
10275             (struct uio *)NULL,
10276             m,
10277             control,
10278             flags, p
10279             ));
10280 }
10281
10282 void
10283 send_forward_tsn(struct sctp_tcb *stcb,
10284     struct sctp_association *asoc)
10285 {
10286         struct sctp_tmit_chunk *chk, *at, *tp1, *last;
10287         struct sctp_forward_tsn_chunk *fwdtsn;
10288         struct sctp_strseq *strseq;
10289         struct sctp_strseq_mid *strseq_m;
10290         uint32_t advance_peer_ack_point;
10291         unsigned int cnt_of_space, i, ovh;
10292         unsigned int space_needed;
10293         unsigned int cnt_of_skipped = 0;
10294
10295         SCTP_TCB_LOCK_ASSERT(stcb);
10296         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
10297                 if (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN) {
10298                         /* mark it to unsent */
10299                         chk->sent = SCTP_DATAGRAM_UNSENT;
10300                         chk->snd_count = 0;
10301                         /* Do we correct its output location? */
10302                         if (chk->whoTo) {
10303                                 sctp_free_remote_addr(chk->whoTo);
10304                                 chk->whoTo = NULL;
10305                         }
10306                         goto sctp_fill_in_rest;
10307                 }
10308         }
10309         /* Ok if we reach here we must build one */
10310         sctp_alloc_a_chunk(stcb, chk);
10311         if (chk == NULL) {
10312                 return;
10313         }
10314         asoc->fwd_tsn_cnt++;
10315         chk->copy_by_ref = 0;
10316         /*
10317          * We don't do the old thing here since this is used not for on-wire
10318          * but to tell if we are sending a fwd-tsn by the stack during
10319          * output. And if its a IFORWARD or a FORWARD it is a fwd-tsn.
10320          */
10321         chk->rec.chunk_id.id = SCTP_FORWARD_CUM_TSN;
10322         chk->rec.chunk_id.can_take_data = 0;
10323         chk->flags = 0;
10324         chk->asoc = asoc;
10325         chk->whoTo = NULL;
10326         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
10327         if (chk->data == NULL) {
10328                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
10329                 return;
10330         }
10331         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
10332         chk->sent = SCTP_DATAGRAM_UNSENT;
10333         chk->snd_count = 0;
10334         TAILQ_INSERT_TAIL(&asoc->control_send_queue, chk, sctp_next);
10335         asoc->ctrl_queue_cnt++;
10336 sctp_fill_in_rest:
10337         /*-
10338          * Here we go through and fill out the part that deals with
10339          * stream/seq of the ones we skip.
10340          */
10341         SCTP_BUF_LEN(chk->data) = 0;
10342         TAILQ_FOREACH(at, &asoc->sent_queue, sctp_next) {
10343                 if ((at->sent != SCTP_FORWARD_TSN_SKIP) &&
10344                     (at->sent != SCTP_DATAGRAM_NR_ACKED)) {
10345                         /* no more to look at */
10346                         break;
10347                 }
10348                 if (!asoc->idata_supported && (at->rec.data.rcv_flags & SCTP_DATA_UNORDERED)) {
10349                         /* We don't report these */
10350                         continue;
10351                 }
10352                 cnt_of_skipped++;
10353         }
10354         if (asoc->idata_supported) {
10355                 space_needed = (sizeof(struct sctp_forward_tsn_chunk) +
10356                     (cnt_of_skipped * sizeof(struct sctp_strseq_mid)));
10357         } else {
10358                 space_needed = (sizeof(struct sctp_forward_tsn_chunk) +
10359                     (cnt_of_skipped * sizeof(struct sctp_strseq)));
10360         }
10361         cnt_of_space = (unsigned int)M_TRAILINGSPACE(chk->data);
10362
10363         if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
10364                 ovh = SCTP_MIN_OVERHEAD;
10365         } else {
10366                 ovh = SCTP_MIN_V4_OVERHEAD;
10367         }
10368         if (cnt_of_space > (asoc->smallest_mtu - ovh)) {
10369                 /* trim to a mtu size */
10370                 cnt_of_space = asoc->smallest_mtu - ovh;
10371         }
10372         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_TRY_ADVANCE) {
10373                 sctp_misc_ints(SCTP_FWD_TSN_CHECK,
10374                     0xff, 0, cnt_of_skipped,
10375                     asoc->advanced_peer_ack_point);
10376         }
10377         advance_peer_ack_point = asoc->advanced_peer_ack_point;
10378         if (cnt_of_space < space_needed) {
10379                 /*-
10380                  * ok we must trim down the chunk by lowering the
10381                  * advance peer ack point.
10382                  */
10383                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_TRY_ADVANCE) {
10384                         sctp_misc_ints(SCTP_FWD_TSN_CHECK,
10385                             0xff, 0xff, cnt_of_space,
10386                             space_needed);
10387                 }
10388                 cnt_of_skipped = cnt_of_space - sizeof(struct sctp_forward_tsn_chunk);
10389                 if (asoc->idata_supported) {
10390                         cnt_of_skipped /= sizeof(struct sctp_strseq_mid);
10391                 } else {
10392                         cnt_of_skipped /= sizeof(struct sctp_strseq);
10393                 }
10394                 /*-
10395                  * Go through and find the TSN that will be the one
10396                  * we report.
10397                  */
10398                 at = TAILQ_FIRST(&asoc->sent_queue);
10399                 if (at != NULL) {
10400                         for (i = 0; i < cnt_of_skipped; i++) {
10401                                 tp1 = TAILQ_NEXT(at, sctp_next);
10402                                 if (tp1 == NULL) {
10403                                         break;
10404                                 }
10405                                 at = tp1;
10406                         }
10407                 }
10408                 if (at && SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_TRY_ADVANCE) {
10409                         sctp_misc_ints(SCTP_FWD_TSN_CHECK,
10410                             0xff, cnt_of_skipped, at->rec.data.tsn,
10411                             asoc->advanced_peer_ack_point);
10412                 }
10413                 last = at;
10414                 /*-
10415                  * last now points to last one I can report, update
10416                  * peer ack point
10417                  */
10418                 if (last) {
10419                         advance_peer_ack_point = last->rec.data.tsn;
10420                 }
10421                 if (asoc->idata_supported) {
10422                         space_needed = sizeof(struct sctp_forward_tsn_chunk) +
10423                             cnt_of_skipped * sizeof(struct sctp_strseq_mid);
10424                 } else {
10425                         space_needed = sizeof(struct sctp_forward_tsn_chunk) +
10426                             cnt_of_skipped * sizeof(struct sctp_strseq);
10427                 }
10428         }
10429         chk->send_size = space_needed;
10430         /* Setup the chunk */
10431         fwdtsn = mtod(chk->data, struct sctp_forward_tsn_chunk *);
10432         fwdtsn->ch.chunk_length = htons(chk->send_size);
10433         fwdtsn->ch.chunk_flags = 0;
10434         if (asoc->idata_supported) {
10435                 fwdtsn->ch.chunk_type = SCTP_IFORWARD_CUM_TSN;
10436         } else {
10437                 fwdtsn->ch.chunk_type = SCTP_FORWARD_CUM_TSN;
10438         }
10439         fwdtsn->new_cumulative_tsn = htonl(advance_peer_ack_point);
10440         SCTP_BUF_LEN(chk->data) = chk->send_size;
10441         fwdtsn++;
10442         /*-
10443          * Move pointer to after the fwdtsn and transfer to the
10444          * strseq pointer.
10445          */
10446         if (asoc->idata_supported) {
10447                 strseq_m = (struct sctp_strseq_mid *)fwdtsn;
10448                 strseq = NULL;
10449         } else {
10450                 strseq = (struct sctp_strseq *)fwdtsn;
10451                 strseq_m = NULL;
10452         }
10453         /*-
10454          * Now populate the strseq list. This is done blindly
10455          * without pulling out duplicate stream info. This is
10456          * inefficent but won't harm the process since the peer will
10457          * look at these in sequence and will thus release anything.
10458          * It could mean we exceed the PMTU and chop off some that
10459          * we could have included.. but this is unlikely (aka 1432/4
10460          * would mean 300+ stream seq's would have to be reported in
10461          * one FWD-TSN. With a bit of work we can later FIX this to
10462          * optimize and pull out duplicates.. but it does add more
10463          * overhead. So for now... not!
10464          */
10465         i = 0;
10466         TAILQ_FOREACH(at, &asoc->sent_queue, sctp_next) {
10467                 if (i >= cnt_of_skipped) {
10468                         break;
10469                 }
10470                 if (!asoc->idata_supported && (at->rec.data.rcv_flags & SCTP_DATA_UNORDERED)) {
10471                         /* We don't report these */
10472                         continue;
10473                 }
10474                 if (at->rec.data.tsn == advance_peer_ack_point) {
10475                         at->rec.data.fwd_tsn_cnt = 0;
10476                 }
10477                 if (asoc->idata_supported) {
10478                         strseq_m->sid = htons(at->rec.data.sid);
10479                         if (at->rec.data.rcv_flags & SCTP_DATA_UNORDERED) {
10480                                 strseq_m->flags = htons(PR_SCTP_UNORDERED_FLAG);
10481                         } else {
10482                                 strseq_m->flags = 0;
10483                         }
10484                         strseq_m->mid = htonl(at->rec.data.mid);
10485                         strseq_m++;
10486                 } else {
10487                         strseq->sid = htons(at->rec.data.sid);
10488                         strseq->ssn = htons((uint16_t)at->rec.data.mid);
10489                         strseq++;
10490                 }
10491                 i++;
10492         }
10493         return;
10494 }
10495
10496 void
10497 sctp_send_sack(struct sctp_tcb *stcb, int so_locked
10498 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
10499     SCTP_UNUSED
10500 #endif
10501 )
10502 {
10503         /*-
10504          * Queue up a SACK or NR-SACK in the control queue.
10505          * We must first check to see if a SACK or NR-SACK is
10506          * somehow on the control queue.
10507          * If so, we will take and and remove the old one.
10508          */
10509         struct sctp_association *asoc;
10510         struct sctp_tmit_chunk *chk, *a_chk;
10511         struct sctp_sack_chunk *sack;
10512         struct sctp_nr_sack_chunk *nr_sack;
10513         struct sctp_gap_ack_block *gap_descriptor;
10514         const struct sack_track *selector;
10515         int mergeable = 0;
10516         int offset;
10517         caddr_t limit;
10518         uint32_t *dup;
10519         int limit_reached = 0;
10520         unsigned int i, siz, j;
10521         unsigned int num_gap_blocks = 0, num_nr_gap_blocks = 0, space;
10522         int num_dups = 0;
10523         int space_req;
10524         uint32_t highest_tsn;
10525         uint8_t flags;
10526         uint8_t type;
10527         uint8_t tsn_map;
10528
10529         if (stcb->asoc.nrsack_supported == 1) {
10530                 type = SCTP_NR_SELECTIVE_ACK;
10531         } else {
10532                 type = SCTP_SELECTIVE_ACK;
10533         }
10534         a_chk = NULL;
10535         asoc = &stcb->asoc;
10536         SCTP_TCB_LOCK_ASSERT(stcb);
10537         if (asoc->last_data_chunk_from == NULL) {
10538                 /* Hmm we never received anything */
10539                 return;
10540         }
10541         sctp_slide_mapping_arrays(stcb);
10542         sctp_set_rwnd(stcb, asoc);
10543         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
10544                 if (chk->rec.chunk_id.id == type) {
10545                         /* Hmm, found a sack already on queue, remove it */
10546                         TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
10547                         asoc->ctrl_queue_cnt--;
10548                         a_chk = chk;
10549                         if (a_chk->data) {
10550                                 sctp_m_freem(a_chk->data);
10551                                 a_chk->data = NULL;
10552                         }
10553                         if (a_chk->whoTo) {
10554                                 sctp_free_remote_addr(a_chk->whoTo);
10555                                 a_chk->whoTo = NULL;
10556                         }
10557                         break;
10558                 }
10559         }
10560         if (a_chk == NULL) {
10561                 sctp_alloc_a_chunk(stcb, a_chk);
10562                 if (a_chk == NULL) {
10563                         /* No memory so we drop the idea, and set a timer */
10564                         if (stcb->asoc.delayed_ack) {
10565                                 sctp_timer_stop(SCTP_TIMER_TYPE_RECV,
10566                                     stcb->sctp_ep, stcb, NULL,
10567                                     SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_3);
10568                                 sctp_timer_start(SCTP_TIMER_TYPE_RECV,
10569                                     stcb->sctp_ep, stcb, NULL);
10570                         } else {
10571                                 stcb->asoc.send_sack = 1;
10572                         }
10573                         return;
10574                 }
10575                 a_chk->copy_by_ref = 0;
10576                 a_chk->rec.chunk_id.id = type;
10577                 a_chk->rec.chunk_id.can_take_data = 1;
10578         }
10579         /* Clear our pkt counts */
10580         asoc->data_pkts_seen = 0;
10581
10582         a_chk->flags = 0;
10583         a_chk->asoc = asoc;
10584         a_chk->snd_count = 0;
10585         a_chk->send_size = 0;   /* fill in later */
10586         a_chk->sent = SCTP_DATAGRAM_UNSENT;
10587         a_chk->whoTo = NULL;
10588
10589         if (!(asoc->last_data_chunk_from->dest_state & SCTP_ADDR_REACHABLE)) {
10590                 /*-
10591                  * Ok, the destination for the SACK is unreachable, lets see if
10592                  * we can select an alternate to asoc->last_data_chunk_from
10593                  */
10594                 a_chk->whoTo = sctp_find_alternate_net(stcb, asoc->last_data_chunk_from, 0);
10595                 if (a_chk->whoTo == NULL) {
10596                         /* Nope, no alternate */
10597                         a_chk->whoTo = asoc->last_data_chunk_from;
10598                 }
10599         } else {
10600                 a_chk->whoTo = asoc->last_data_chunk_from;
10601         }
10602         if (a_chk->whoTo) {
10603                 atomic_add_int(&a_chk->whoTo->ref_count, 1);
10604         }
10605         if (SCTP_TSN_GT(asoc->highest_tsn_inside_map, asoc->highest_tsn_inside_nr_map)) {
10606                 highest_tsn = asoc->highest_tsn_inside_map;
10607         } else {
10608                 highest_tsn = asoc->highest_tsn_inside_nr_map;
10609         }
10610         if (highest_tsn == asoc->cumulative_tsn) {
10611                 /* no gaps */
10612                 if (type == SCTP_SELECTIVE_ACK) {
10613                         space_req = sizeof(struct sctp_sack_chunk);
10614                 } else {
10615                         space_req = sizeof(struct sctp_nr_sack_chunk);
10616                 }
10617         } else {
10618                 /* gaps get a cluster */
10619                 space_req = MCLBYTES;
10620         }
10621         /* Ok now lets formulate a MBUF with our sack */
10622         a_chk->data = sctp_get_mbuf_for_msg(space_req, 0, M_NOWAIT, 1, MT_DATA);
10623         if ((a_chk->data == NULL) ||
10624             (a_chk->whoTo == NULL)) {
10625                 /* rats, no mbuf memory */
10626                 if (a_chk->data) {
10627                         /* was a problem with the destination */
10628                         sctp_m_freem(a_chk->data);
10629                         a_chk->data = NULL;
10630                 }
10631                 sctp_free_a_chunk(stcb, a_chk, so_locked);
10632                 /* sa_ignore NO_NULL_CHK */
10633                 if (stcb->asoc.delayed_ack) {
10634                         sctp_timer_stop(SCTP_TIMER_TYPE_RECV,
10635                             stcb->sctp_ep, stcb, NULL,
10636                             SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_4);
10637                         sctp_timer_start(SCTP_TIMER_TYPE_RECV,
10638                             stcb->sctp_ep, stcb, NULL);
10639                 } else {
10640                         stcb->asoc.send_sack = 1;
10641                 }
10642                 return;
10643         }
10644         /* ok, lets go through and fill it in */
10645         SCTP_BUF_RESV_UF(a_chk->data, SCTP_MIN_OVERHEAD);
10646         space = (unsigned int)M_TRAILINGSPACE(a_chk->data);
10647         if (space > (a_chk->whoTo->mtu - SCTP_MIN_OVERHEAD)) {
10648                 space = (a_chk->whoTo->mtu - SCTP_MIN_OVERHEAD);
10649         }
10650         limit = mtod(a_chk->data, caddr_t);
10651         limit += space;
10652
10653         flags = 0;
10654
10655         if ((asoc->sctp_cmt_on_off > 0) &&
10656             SCTP_BASE_SYSCTL(sctp_cmt_use_dac)) {
10657                 /*-
10658                  * CMT DAC algorithm: If 2 (i.e., 0x10) packets have been
10659                  * received, then set high bit to 1, else 0. Reset
10660                  * pkts_rcvd.
10661                  */
10662                 flags |= (asoc->cmt_dac_pkts_rcvd << 6);
10663                 asoc->cmt_dac_pkts_rcvd = 0;
10664         }
10665 #ifdef SCTP_ASOCLOG_OF_TSNS
10666         stcb->asoc.cumack_logsnt[stcb->asoc.cumack_log_atsnt] = asoc->cumulative_tsn;
10667         stcb->asoc.cumack_log_atsnt++;
10668         if (stcb->asoc.cumack_log_atsnt >= SCTP_TSN_LOG_SIZE) {
10669                 stcb->asoc.cumack_log_atsnt = 0;
10670         }
10671 #endif
10672         /* reset the readers interpretation */
10673         stcb->freed_by_sorcv_sincelast = 0;
10674
10675         if (type == SCTP_SELECTIVE_ACK) {
10676                 sack = mtod(a_chk->data, struct sctp_sack_chunk *);
10677                 nr_sack = NULL;
10678                 gap_descriptor = (struct sctp_gap_ack_block *)((caddr_t)sack + sizeof(struct sctp_sack_chunk));
10679                 if (highest_tsn > asoc->mapping_array_base_tsn) {
10680                         siz = (((highest_tsn - asoc->mapping_array_base_tsn) + 1) + 7) / 8;
10681                 } else {
10682                         siz = (((MAX_TSN - highest_tsn) + 1) + highest_tsn + 7) / 8;
10683                 }
10684         } else {
10685                 sack = NULL;
10686                 nr_sack = mtod(a_chk->data, struct sctp_nr_sack_chunk *);
10687                 gap_descriptor = (struct sctp_gap_ack_block *)((caddr_t)nr_sack + sizeof(struct sctp_nr_sack_chunk));
10688                 if (asoc->highest_tsn_inside_map > asoc->mapping_array_base_tsn) {
10689                         siz = (((asoc->highest_tsn_inside_map - asoc->mapping_array_base_tsn) + 1) + 7) / 8;
10690                 } else {
10691                         siz = (((MAX_TSN - asoc->mapping_array_base_tsn) + 1) + asoc->highest_tsn_inside_map + 7) / 8;
10692                 }
10693         }
10694
10695         if (SCTP_TSN_GT(asoc->mapping_array_base_tsn, asoc->cumulative_tsn)) {
10696                 offset = 1;
10697         } else {
10698                 offset = asoc->mapping_array_base_tsn - asoc->cumulative_tsn;
10699         }
10700         if (((type == SCTP_SELECTIVE_ACK) &&
10701             SCTP_TSN_GT(highest_tsn, asoc->cumulative_tsn)) ||
10702             ((type == SCTP_NR_SELECTIVE_ACK) &&
10703             SCTP_TSN_GT(asoc->highest_tsn_inside_map, asoc->cumulative_tsn))) {
10704                 /* we have a gap .. maybe */
10705                 for (i = 0; i < siz; i++) {
10706                         tsn_map = asoc->mapping_array[i];
10707                         if (type == SCTP_SELECTIVE_ACK) {
10708                                 tsn_map |= asoc->nr_mapping_array[i];
10709                         }
10710                         if (i == 0) {
10711                                 /*
10712                                  * Clear all bits corresponding to TSNs
10713                                  * smaller or equal to the cumulative TSN.
10714                                  */
10715                                 tsn_map &= (~0U << (1 - offset));
10716                         }
10717                         selector = &sack_array[tsn_map];
10718                         if (mergeable && selector->right_edge) {
10719                                 /*
10720                                  * Backup, left and right edges were ok to
10721                                  * merge.
10722                                  */
10723                                 num_gap_blocks--;
10724                                 gap_descriptor--;
10725                         }
10726                         if (selector->num_entries == 0)
10727                                 mergeable = 0;
10728                         else {
10729                                 for (j = 0; j < selector->num_entries; j++) {
10730                                         if (mergeable && selector->right_edge) {
10731                                                 /*
10732                                                  * do a merge by NOT setting
10733                                                  * the left side
10734                                                  */
10735                                                 mergeable = 0;
10736                                         } else {
10737                                                 /*
10738                                                  * no merge, set the left
10739                                                  * side
10740                                                  */
10741                                                 mergeable = 0;
10742                                                 gap_descriptor->start = htons((selector->gaps[j].start + offset));
10743                                         }
10744                                         gap_descriptor->end = htons((selector->gaps[j].end + offset));
10745                                         num_gap_blocks++;
10746                                         gap_descriptor++;
10747                                         if (((caddr_t)gap_descriptor + sizeof(struct sctp_gap_ack_block)) > limit) {
10748                                                 /* no more room */
10749                                                 limit_reached = 1;
10750                                                 break;
10751                                         }
10752                                 }
10753                                 if (selector->left_edge) {
10754                                         mergeable = 1;
10755                                 }
10756                         }
10757                         if (limit_reached) {
10758                                 /* Reached the limit stop */
10759                                 break;
10760                         }
10761                         offset += 8;
10762                 }
10763         }
10764         if ((type == SCTP_NR_SELECTIVE_ACK) &&
10765             (limit_reached == 0)) {
10766
10767                 mergeable = 0;
10768
10769                 if (asoc->highest_tsn_inside_nr_map > asoc->mapping_array_base_tsn) {
10770                         siz = (((asoc->highest_tsn_inside_nr_map - asoc->mapping_array_base_tsn) + 1) + 7) / 8;
10771                 } else {
10772                         siz = (((MAX_TSN - asoc->mapping_array_base_tsn) + 1) + asoc->highest_tsn_inside_nr_map + 7) / 8;
10773                 }
10774
10775                 if (SCTP_TSN_GT(asoc->mapping_array_base_tsn, asoc->cumulative_tsn)) {
10776                         offset = 1;
10777                 } else {
10778                         offset = asoc->mapping_array_base_tsn - asoc->cumulative_tsn;
10779                 }
10780                 if (SCTP_TSN_GT(asoc->highest_tsn_inside_nr_map, asoc->cumulative_tsn)) {
10781                         /* we have a gap .. maybe */
10782                         for (i = 0; i < siz; i++) {
10783                                 tsn_map = asoc->nr_mapping_array[i];
10784                                 if (i == 0) {
10785                                         /*
10786                                          * Clear all bits corresponding to
10787                                          * TSNs smaller or equal to the
10788                                          * cumulative TSN.
10789                                          */
10790                                         tsn_map &= (~0U << (1 - offset));
10791                                 }
10792                                 selector = &sack_array[tsn_map];
10793                                 if (mergeable && selector->right_edge) {
10794                                         /*
10795                                          * Backup, left and right edges were
10796                                          * ok to merge.
10797                                          */
10798                                         num_nr_gap_blocks--;
10799                                         gap_descriptor--;
10800                                 }
10801                                 if (selector->num_entries == 0)
10802                                         mergeable = 0;
10803                                 else {
10804                                         for (j = 0; j < selector->num_entries; j++) {
10805                                                 if (mergeable && selector->right_edge) {
10806                                                         /*
10807                                                          * do a merge by NOT
10808                                                          * setting the left
10809                                                          * side
10810                                                          */
10811                                                         mergeable = 0;
10812                                                 } else {
10813                                                         /*
10814                                                          * no merge, set the
10815                                                          * left side
10816                                                          */
10817                                                         mergeable = 0;
10818                                                         gap_descriptor->start = htons((selector->gaps[j].start + offset));
10819                                                 }
10820                                                 gap_descriptor->end = htons((selector->gaps[j].end + offset));
10821                                                 num_nr_gap_blocks++;
10822                                                 gap_descriptor++;
10823                                                 if (((caddr_t)gap_descriptor + sizeof(struct sctp_gap_ack_block)) > limit) {
10824                                                         /* no more room */
10825                                                         limit_reached = 1;
10826                                                         break;
10827                                                 }
10828                                         }
10829                                         if (selector->left_edge) {
10830                                                 mergeable = 1;
10831                                         }
10832                                 }
10833                                 if (limit_reached) {
10834                                         /* Reached the limit stop */
10835                                         break;
10836                                 }
10837                                 offset += 8;
10838                         }
10839                 }
10840         }
10841         /* now we must add any dups we are going to report. */
10842         if ((limit_reached == 0) && (asoc->numduptsns)) {
10843                 dup = (uint32_t *)gap_descriptor;
10844                 for (i = 0; i < asoc->numduptsns; i++) {
10845                         *dup = htonl(asoc->dup_tsns[i]);
10846                         dup++;
10847                         num_dups++;
10848                         if (((caddr_t)dup + sizeof(uint32_t)) > limit) {
10849                                 /* no more room */
10850                                 break;
10851                         }
10852                 }
10853                 asoc->numduptsns = 0;
10854         }
10855         /*
10856          * now that the chunk is prepared queue it to the control chunk
10857          * queue.
10858          */
10859         if (type == SCTP_SELECTIVE_ACK) {
10860                 a_chk->send_size = (uint16_t)(sizeof(struct sctp_sack_chunk) +
10861                     (num_gap_blocks + num_nr_gap_blocks) * sizeof(struct sctp_gap_ack_block) +
10862                     num_dups * sizeof(int32_t));
10863                 SCTP_BUF_LEN(a_chk->data) = a_chk->send_size;
10864                 sack->sack.cum_tsn_ack = htonl(asoc->cumulative_tsn);
10865                 sack->sack.a_rwnd = htonl(asoc->my_rwnd);
10866                 sack->sack.num_gap_ack_blks = htons(num_gap_blocks);
10867                 sack->sack.num_dup_tsns = htons(num_dups);
10868                 sack->ch.chunk_type = type;
10869                 sack->ch.chunk_flags = flags;
10870                 sack->ch.chunk_length = htons(a_chk->send_size);
10871         } else {
10872                 a_chk->send_size = (uint16_t)(sizeof(struct sctp_nr_sack_chunk) +
10873                     (num_gap_blocks + num_nr_gap_blocks) * sizeof(struct sctp_gap_ack_block) +
10874                     num_dups * sizeof(int32_t));
10875                 SCTP_BUF_LEN(a_chk->data) = a_chk->send_size;
10876                 nr_sack->nr_sack.cum_tsn_ack = htonl(asoc->cumulative_tsn);
10877                 nr_sack->nr_sack.a_rwnd = htonl(asoc->my_rwnd);
10878                 nr_sack->nr_sack.num_gap_ack_blks = htons(num_gap_blocks);
10879                 nr_sack->nr_sack.num_nr_gap_ack_blks = htons(num_nr_gap_blocks);
10880                 nr_sack->nr_sack.num_dup_tsns = htons(num_dups);
10881                 nr_sack->nr_sack.reserved = 0;
10882                 nr_sack->ch.chunk_type = type;
10883                 nr_sack->ch.chunk_flags = flags;
10884                 nr_sack->ch.chunk_length = htons(a_chk->send_size);
10885         }
10886         TAILQ_INSERT_TAIL(&asoc->control_send_queue, a_chk, sctp_next);
10887         asoc->my_last_reported_rwnd = asoc->my_rwnd;
10888         asoc->ctrl_queue_cnt++;
10889         asoc->send_sack = 0;
10890         SCTP_STAT_INCR(sctps_sendsacks);
10891         return;
10892 }
10893
10894 void
10895 sctp_send_abort_tcb(struct sctp_tcb *stcb, struct mbuf *operr, int so_locked
10896 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
10897     SCTP_UNUSED
10898 #endif
10899 )
10900 {
10901         struct mbuf *m_abort, *m, *m_last;
10902         struct mbuf *m_out, *m_end = NULL;
10903         struct sctp_abort_chunk *abort;
10904         struct sctp_auth_chunk *auth = NULL;
10905         struct sctp_nets *net;
10906         uint32_t vtag;
10907         uint32_t auth_offset = 0;
10908         int error;
10909         uint16_t cause_len, chunk_len, padding_len;
10910
10911         SCTP_TCB_LOCK_ASSERT(stcb);
10912         /*-
10913          * Add an AUTH chunk, if chunk requires it and save the offset into
10914          * the chain for AUTH
10915          */
10916         if (sctp_auth_is_required_chunk(SCTP_ABORT_ASSOCIATION,
10917             stcb->asoc.peer_auth_chunks)) {
10918                 m_out = sctp_add_auth_chunk(NULL, &m_end, &auth, &auth_offset,
10919                     stcb, SCTP_ABORT_ASSOCIATION);
10920                 SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
10921         } else {
10922                 m_out = NULL;
10923         }
10924         m_abort = sctp_get_mbuf_for_msg(sizeof(struct sctp_abort_chunk), 0, M_NOWAIT, 1, MT_HEADER);
10925         if (m_abort == NULL) {
10926                 if (m_out) {
10927                         sctp_m_freem(m_out);
10928                 }
10929                 if (operr) {
10930                         sctp_m_freem(operr);
10931                 }
10932                 return;
10933         }
10934         /* link in any error */
10935         SCTP_BUF_NEXT(m_abort) = operr;
10936         cause_len = 0;
10937         m_last = NULL;
10938         for (m = operr; m; m = SCTP_BUF_NEXT(m)) {
10939                 cause_len += (uint16_t)SCTP_BUF_LEN(m);
10940                 if (SCTP_BUF_NEXT(m) == NULL) {
10941                         m_last = m;
10942                 }
10943         }
10944         SCTP_BUF_LEN(m_abort) = sizeof(struct sctp_abort_chunk);
10945         chunk_len = (uint16_t)sizeof(struct sctp_abort_chunk) + cause_len;
10946         padding_len = SCTP_SIZE32(chunk_len) - chunk_len;
10947         if (m_out == NULL) {
10948                 /* NO Auth chunk prepended, so reserve space in front */
10949                 SCTP_BUF_RESV_UF(m_abort, SCTP_MIN_OVERHEAD);
10950                 m_out = m_abort;
10951         } else {
10952                 /* Put AUTH chunk at the front of the chain */
10953                 SCTP_BUF_NEXT(m_end) = m_abort;
10954         }
10955         if (stcb->asoc.alternate) {
10956                 net = stcb->asoc.alternate;
10957         } else {
10958                 net = stcb->asoc.primary_destination;
10959         }
10960         /* Fill in the ABORT chunk header. */
10961         abort = mtod(m_abort, struct sctp_abort_chunk *);
10962         abort->ch.chunk_type = SCTP_ABORT_ASSOCIATION;
10963         if (stcb->asoc.peer_vtag == 0) {
10964                 /* This happens iff the assoc is in COOKIE-WAIT state. */
10965                 vtag = stcb->asoc.my_vtag;
10966                 abort->ch.chunk_flags = SCTP_HAD_NO_TCB;
10967         } else {
10968                 vtag = stcb->asoc.peer_vtag;
10969                 abort->ch.chunk_flags = 0;
10970         }
10971         abort->ch.chunk_length = htons(chunk_len);
10972         /* Add padding, if necessary. */
10973         if (padding_len > 0) {
10974                 if ((m_last == NULL) ||
10975                     (sctp_add_pad_tombuf(m_last, padding_len) == NULL)) {
10976                         sctp_m_freem(m_out);
10977                         return;
10978                 }
10979         }
10980         if ((error = sctp_lowlevel_chunk_output(stcb->sctp_ep, stcb, net,
10981             (struct sockaddr *)&net->ro._l_addr,
10982             m_out, auth_offset, auth, stcb->asoc.authinfo.active_keyid, 1, 0, 0,
10983             stcb->sctp_ep->sctp_lport, stcb->rport, htonl(vtag),
10984             stcb->asoc.primary_destination->port, NULL,
10985             0, 0,
10986             so_locked))) {
10987                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
10988                 if (error == ENOBUFS) {
10989                         stcb->asoc.ifp_had_enobuf = 1;
10990                         SCTP_STAT_INCR(sctps_lowlevelerr);
10991                 }
10992         } else {
10993                 stcb->asoc.ifp_had_enobuf = 0;
10994         }
10995         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
10996 }
10997
10998 void
10999 sctp_send_shutdown_complete(struct sctp_tcb *stcb,
11000     struct sctp_nets *net,
11001     int reflect_vtag)
11002 {
11003         /* formulate and SEND a SHUTDOWN-COMPLETE */
11004         struct mbuf *m_shutdown_comp;
11005         struct sctp_shutdown_complete_chunk *shutdown_complete;
11006         uint32_t vtag;
11007         int error;
11008         uint8_t flags;
11009
11010         m_shutdown_comp = sctp_get_mbuf_for_msg(sizeof(struct sctp_chunkhdr), 0, M_NOWAIT, 1, MT_HEADER);
11011         if (m_shutdown_comp == NULL) {
11012                 /* no mbuf's */
11013                 return;
11014         }
11015         if (reflect_vtag) {
11016                 flags = SCTP_HAD_NO_TCB;
11017                 vtag = stcb->asoc.my_vtag;
11018         } else {
11019                 flags = 0;
11020                 vtag = stcb->asoc.peer_vtag;
11021         }
11022         shutdown_complete = mtod(m_shutdown_comp, struct sctp_shutdown_complete_chunk *);
11023         shutdown_complete->ch.chunk_type = SCTP_SHUTDOWN_COMPLETE;
11024         shutdown_complete->ch.chunk_flags = flags;
11025         shutdown_complete->ch.chunk_length = htons(sizeof(struct sctp_shutdown_complete_chunk));
11026         SCTP_BUF_LEN(m_shutdown_comp) = sizeof(struct sctp_shutdown_complete_chunk);
11027         if ((error = sctp_lowlevel_chunk_output(stcb->sctp_ep, stcb, net,
11028             (struct sockaddr *)&net->ro._l_addr,
11029             m_shutdown_comp, 0, NULL, 0, 1, 0, 0,
11030             stcb->sctp_ep->sctp_lport, stcb->rport,
11031             htonl(vtag),
11032             net->port, NULL,
11033             0, 0,
11034             SCTP_SO_NOT_LOCKED))) {
11035                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
11036                 if (error == ENOBUFS) {
11037                         stcb->asoc.ifp_had_enobuf = 1;
11038                         SCTP_STAT_INCR(sctps_lowlevelerr);
11039                 }
11040         } else {
11041                 stcb->asoc.ifp_had_enobuf = 0;
11042         }
11043         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
11044         return;
11045 }
11046
11047 static void
11048 sctp_send_resp_msg(struct sockaddr *src, struct sockaddr *dst,
11049     struct sctphdr *sh, uint32_t vtag,
11050     uint8_t type, struct mbuf *cause,
11051     uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum,
11052     uint32_t vrf_id, uint16_t port)
11053 {
11054         struct mbuf *o_pak;
11055         struct mbuf *mout;
11056         struct sctphdr *shout;
11057         struct sctp_chunkhdr *ch;
11058 #if defined(INET) || defined(INET6)
11059         struct udphdr *udp;
11060 #endif
11061         int ret, len, cause_len, padding_len;
11062 #ifdef INET
11063         struct sockaddr_in *src_sin, *dst_sin;
11064         struct ip *ip;
11065 #endif
11066 #ifdef INET6
11067         struct sockaddr_in6 *src_sin6, *dst_sin6;
11068         struct ip6_hdr *ip6;
11069 #endif
11070
11071         /* Compute the length of the cause and add final padding. */
11072         cause_len = 0;
11073         if (cause != NULL) {
11074                 struct mbuf *m_at, *m_last = NULL;
11075
11076                 for (m_at = cause; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
11077                         if (SCTP_BUF_NEXT(m_at) == NULL)
11078                                 m_last = m_at;
11079                         cause_len += SCTP_BUF_LEN(m_at);
11080                 }
11081                 padding_len = cause_len % 4;
11082                 if (padding_len != 0) {
11083                         padding_len = 4 - padding_len;
11084                 }
11085                 if (padding_len != 0) {
11086                         if (sctp_add_pad_tombuf(m_last, padding_len) == NULL) {
11087                                 sctp_m_freem(cause);
11088                                 return;
11089                         }
11090                 }
11091         } else {
11092                 padding_len = 0;
11093         }
11094         /* Get an mbuf for the header. */
11095         len = sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
11096         switch (dst->sa_family) {
11097 #ifdef INET
11098         case AF_INET:
11099                 len += sizeof(struct ip);
11100                 break;
11101 #endif
11102 #ifdef INET6
11103         case AF_INET6:
11104                 len += sizeof(struct ip6_hdr);
11105                 break;
11106 #endif
11107         default:
11108                 break;
11109         }
11110 #if defined(INET) || defined(INET6)
11111         if (port) {
11112                 len += sizeof(struct udphdr);
11113         }
11114 #endif
11115         mout = sctp_get_mbuf_for_msg(len + max_linkhdr, 1, M_NOWAIT, 1, MT_DATA);
11116         if (mout == NULL) {
11117                 if (cause) {
11118                         sctp_m_freem(cause);
11119                 }
11120                 return;
11121         }
11122         SCTP_BUF_RESV_UF(mout, max_linkhdr);
11123         SCTP_BUF_LEN(mout) = len;
11124         SCTP_BUF_NEXT(mout) = cause;
11125         M_SETFIB(mout, fibnum);
11126         mout->m_pkthdr.flowid = mflowid;
11127         M_HASHTYPE_SET(mout, mflowtype);
11128 #ifdef INET
11129         ip = NULL;
11130 #endif
11131 #ifdef INET6
11132         ip6 = NULL;
11133 #endif
11134         switch (dst->sa_family) {
11135 #ifdef INET
11136         case AF_INET:
11137                 src_sin = (struct sockaddr_in *)src;
11138                 dst_sin = (struct sockaddr_in *)dst;
11139                 ip = mtod(mout, struct ip *);
11140                 ip->ip_v = IPVERSION;
11141                 ip->ip_hl = (sizeof(struct ip) >> 2);
11142                 ip->ip_tos = 0;
11143                 ip->ip_off = htons(IP_DF);
11144                 ip_fillid(ip);
11145                 ip->ip_ttl = MODULE_GLOBAL(ip_defttl);
11146                 if (port) {
11147                         ip->ip_p = IPPROTO_UDP;
11148                 } else {
11149                         ip->ip_p = IPPROTO_SCTP;
11150                 }
11151                 ip->ip_src.s_addr = dst_sin->sin_addr.s_addr;
11152                 ip->ip_dst.s_addr = src_sin->sin_addr.s_addr;
11153                 ip->ip_sum = 0;
11154                 len = sizeof(struct ip);
11155                 shout = (struct sctphdr *)((caddr_t)ip + len);
11156                 break;
11157 #endif
11158 #ifdef INET6
11159         case AF_INET6:
11160                 src_sin6 = (struct sockaddr_in6 *)src;
11161                 dst_sin6 = (struct sockaddr_in6 *)dst;
11162                 ip6 = mtod(mout, struct ip6_hdr *);
11163                 ip6->ip6_flow = htonl(0x60000000);
11164                 if (V_ip6_auto_flowlabel) {
11165                         ip6->ip6_flow |= (htonl(ip6_randomflowlabel()) & IPV6_FLOWLABEL_MASK);
11166                 }
11167                 ip6->ip6_hlim = MODULE_GLOBAL(ip6_defhlim);
11168                 if (port) {
11169                         ip6->ip6_nxt = IPPROTO_UDP;
11170                 } else {
11171                         ip6->ip6_nxt = IPPROTO_SCTP;
11172                 }
11173                 ip6->ip6_src = dst_sin6->sin6_addr;
11174                 ip6->ip6_dst = src_sin6->sin6_addr;
11175                 len = sizeof(struct ip6_hdr);
11176                 shout = (struct sctphdr *)((caddr_t)ip6 + len);
11177                 break;
11178 #endif
11179         default:
11180                 len = 0;
11181                 shout = mtod(mout, struct sctphdr *);
11182                 break;
11183         }
11184 #if defined(INET) || defined(INET6)
11185         if (port) {
11186                 if (htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port)) == 0) {
11187                         sctp_m_freem(mout);
11188                         return;
11189                 }
11190                 udp = (struct udphdr *)shout;
11191                 udp->uh_sport = htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port));
11192                 udp->uh_dport = port;
11193                 udp->uh_sum = 0;
11194                 udp->uh_ulen = htons((uint16_t)(sizeof(struct udphdr) +
11195                     sizeof(struct sctphdr) +
11196                     sizeof(struct sctp_chunkhdr) +
11197                     cause_len + padding_len));
11198                 len += sizeof(struct udphdr);
11199                 shout = (struct sctphdr *)((caddr_t)shout + sizeof(struct udphdr));
11200         } else {
11201                 udp = NULL;
11202         }
11203 #endif
11204         shout->src_port = sh->dest_port;
11205         shout->dest_port = sh->src_port;
11206         shout->checksum = 0;
11207         if (vtag) {
11208                 shout->v_tag = htonl(vtag);
11209         } else {
11210                 shout->v_tag = sh->v_tag;
11211         }
11212         len += sizeof(struct sctphdr);
11213         ch = (struct sctp_chunkhdr *)((caddr_t)shout + sizeof(struct sctphdr));
11214         ch->chunk_type = type;
11215         if (vtag) {
11216                 ch->chunk_flags = 0;
11217         } else {
11218                 ch->chunk_flags = SCTP_HAD_NO_TCB;
11219         }
11220         ch->chunk_length = htons((uint16_t)(sizeof(struct sctp_chunkhdr) + cause_len));
11221         len += sizeof(struct sctp_chunkhdr);
11222         len += cause_len + padding_len;
11223
11224         if (SCTP_GET_HEADER_FOR_OUTPUT(o_pak)) {
11225                 sctp_m_freem(mout);
11226                 return;
11227         }
11228         SCTP_ATTACH_CHAIN(o_pak, mout, len);
11229         switch (dst->sa_family) {
11230 #ifdef INET
11231         case AF_INET:
11232                 if (port) {
11233                         if (V_udp_cksum) {
11234                                 udp->uh_sum = in_pseudo(ip->ip_src.s_addr, ip->ip_dst.s_addr, udp->uh_ulen + htons(IPPROTO_UDP));
11235                         } else {
11236                                 udp->uh_sum = 0;
11237                         }
11238                 }
11239                 ip->ip_len = htons(len);
11240                 if (port) {
11241                         shout->checksum = sctp_calculate_cksum(mout, sizeof(struct ip) + sizeof(struct udphdr));
11242                         SCTP_STAT_INCR(sctps_sendswcrc);
11243                         if (V_udp_cksum) {
11244                                 SCTP_ENABLE_UDP_CSUM(o_pak);
11245                         }
11246                 } else {
11247                         mout->m_pkthdr.csum_flags = CSUM_SCTP;
11248                         mout->m_pkthdr.csum_data = offsetof(struct sctphdr, checksum);
11249                         SCTP_STAT_INCR(sctps_sendhwcrc);
11250                 }
11251 #ifdef SCTP_PACKET_LOGGING
11252                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING) {
11253                         sctp_packet_log(o_pak);
11254                 }
11255 #endif
11256                 SCTP_IP_OUTPUT(ret, o_pak, NULL, NULL, vrf_id);
11257                 break;
11258 #endif
11259 #ifdef INET6
11260         case AF_INET6:
11261                 ip6->ip6_plen = htons((uint16_t)(len - sizeof(struct ip6_hdr)));
11262                 if (port) {
11263                         shout->checksum = sctp_calculate_cksum(mout, sizeof(struct ip6_hdr) + sizeof(struct udphdr));
11264                         SCTP_STAT_INCR(sctps_sendswcrc);
11265                         if ((udp->uh_sum = in6_cksum(o_pak, IPPROTO_UDP, sizeof(struct ip6_hdr), len - sizeof(struct ip6_hdr))) == 0) {
11266                                 udp->uh_sum = 0xffff;
11267                         }
11268                 } else {
11269                         mout->m_pkthdr.csum_flags = CSUM_SCTP_IPV6;
11270                         mout->m_pkthdr.csum_data = offsetof(struct sctphdr, checksum);
11271                         SCTP_STAT_INCR(sctps_sendhwcrc);
11272                 }
11273 #ifdef SCTP_PACKET_LOGGING
11274                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING) {
11275                         sctp_packet_log(o_pak);
11276                 }
11277 #endif
11278                 SCTP_IP6_OUTPUT(ret, o_pak, NULL, NULL, NULL, vrf_id);
11279                 break;
11280 #endif
11281         default:
11282                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Unknown protocol (TSNH) type %d\n",
11283                     dst->sa_family);
11284                 sctp_m_freem(mout);
11285                 SCTP_LTRACE_ERR_RET_PKT(mout, NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EFAULT);
11286                 return;
11287         }
11288         SCTPDBG(SCTP_DEBUG_OUTPUT3, "return from send is %d\n", ret);
11289         SCTP_STAT_INCR(sctps_sendpackets);
11290         SCTP_STAT_INCR_COUNTER64(sctps_outpackets);
11291         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
11292         if (ret) {
11293                 SCTP_STAT_INCR(sctps_senderrors);
11294         }
11295         return;
11296 }
11297
11298 void
11299 sctp_send_shutdown_complete2(struct sockaddr *src, struct sockaddr *dst,
11300     struct sctphdr *sh,
11301     uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum,
11302     uint32_t vrf_id, uint16_t port)
11303 {
11304         sctp_send_resp_msg(src, dst, sh, 0, SCTP_SHUTDOWN_COMPLETE, NULL,
11305             mflowtype, mflowid, fibnum,
11306             vrf_id, port);
11307 }
11308
11309 void
11310 sctp_send_hb(struct sctp_tcb *stcb, struct sctp_nets *net, int so_locked
11311 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
11312     SCTP_UNUSED
11313 #endif
11314 )
11315 {
11316         struct sctp_tmit_chunk *chk;
11317         struct sctp_heartbeat_chunk *hb;
11318         struct timeval now;
11319
11320         SCTP_TCB_LOCK_ASSERT(stcb);
11321         if (net == NULL) {
11322                 return;
11323         }
11324         (void)SCTP_GETTIME_TIMEVAL(&now);
11325         switch (net->ro._l_addr.sa.sa_family) {
11326 #ifdef INET
11327         case AF_INET:
11328                 break;
11329 #endif
11330 #ifdef INET6
11331         case AF_INET6:
11332                 break;
11333 #endif
11334         default:
11335                 return;
11336         }
11337         sctp_alloc_a_chunk(stcb, chk);
11338         if (chk == NULL) {
11339                 SCTPDBG(SCTP_DEBUG_OUTPUT4, "Gak, can't get a chunk for hb\n");
11340                 return;
11341         }
11342
11343         chk->copy_by_ref = 0;
11344         chk->rec.chunk_id.id = SCTP_HEARTBEAT_REQUEST;
11345         chk->rec.chunk_id.can_take_data = 1;
11346         chk->flags = 0;
11347         chk->asoc = &stcb->asoc;
11348         chk->send_size = sizeof(struct sctp_heartbeat_chunk);
11349
11350         chk->data = sctp_get_mbuf_for_msg(chk->send_size, 0, M_NOWAIT, 1, MT_HEADER);
11351         if (chk->data == NULL) {
11352                 sctp_free_a_chunk(stcb, chk, so_locked);
11353                 return;
11354         }
11355         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11356         SCTP_BUF_LEN(chk->data) = chk->send_size;
11357         chk->sent = SCTP_DATAGRAM_UNSENT;
11358         chk->snd_count = 0;
11359         chk->whoTo = net;
11360         atomic_add_int(&chk->whoTo->ref_count, 1);
11361         /* Now we have a mbuf that we can fill in with the details */
11362         hb = mtod(chk->data, struct sctp_heartbeat_chunk *);
11363         memset(hb, 0, sizeof(struct sctp_heartbeat_chunk));
11364         /* fill out chunk header */
11365         hb->ch.chunk_type = SCTP_HEARTBEAT_REQUEST;
11366         hb->ch.chunk_flags = 0;
11367         hb->ch.chunk_length = htons(chk->send_size);
11368         /* Fill out hb parameter */
11369         hb->heartbeat.hb_info.ph.param_type = htons(SCTP_HEARTBEAT_INFO);
11370         hb->heartbeat.hb_info.ph.param_length = htons(sizeof(struct sctp_heartbeat_info_param));
11371         hb->heartbeat.hb_info.time_value_1 = now.tv_sec;
11372         hb->heartbeat.hb_info.time_value_2 = now.tv_usec;
11373         /* Did our user request this one, put it in */
11374         hb->heartbeat.hb_info.addr_family = (uint8_t)net->ro._l_addr.sa.sa_family;
11375         hb->heartbeat.hb_info.addr_len = net->ro._l_addr.sa.sa_len;
11376         if (net->dest_state & SCTP_ADDR_UNCONFIRMED) {
11377                 /*
11378                  * we only take from the entropy pool if the address is not
11379                  * confirmed.
11380                  */
11381                 net->heartbeat_random1 = hb->heartbeat.hb_info.random_value1 = sctp_select_initial_TSN(&stcb->sctp_ep->sctp_ep);
11382                 net->heartbeat_random2 = hb->heartbeat.hb_info.random_value2 = sctp_select_initial_TSN(&stcb->sctp_ep->sctp_ep);
11383         } else {
11384                 net->heartbeat_random1 = hb->heartbeat.hb_info.random_value1 = 0;
11385                 net->heartbeat_random2 = hb->heartbeat.hb_info.random_value2 = 0;
11386         }
11387         switch (net->ro._l_addr.sa.sa_family) {
11388 #ifdef INET
11389         case AF_INET:
11390                 memcpy(hb->heartbeat.hb_info.address,
11391                     &net->ro._l_addr.sin.sin_addr,
11392                     sizeof(net->ro._l_addr.sin.sin_addr));
11393                 break;
11394 #endif
11395 #ifdef INET6
11396         case AF_INET6:
11397                 memcpy(hb->heartbeat.hb_info.address,
11398                     &net->ro._l_addr.sin6.sin6_addr,
11399                     sizeof(net->ro._l_addr.sin6.sin6_addr));
11400                 break;
11401 #endif
11402         default:
11403                 if (chk->data) {
11404                         sctp_m_freem(chk->data);
11405                         chk->data = NULL;
11406                 }
11407                 sctp_free_a_chunk(stcb, chk, so_locked);
11408                 return;
11409                 break;
11410         }
11411         net->hb_responded = 0;
11412         TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
11413         stcb->asoc.ctrl_queue_cnt++;
11414         SCTP_STAT_INCR(sctps_sendheartbeat);
11415         return;
11416 }
11417
11418 void
11419 sctp_send_ecn_echo(struct sctp_tcb *stcb, struct sctp_nets *net,
11420     uint32_t high_tsn)
11421 {
11422         struct sctp_association *asoc;
11423         struct sctp_ecne_chunk *ecne;
11424         struct sctp_tmit_chunk *chk;
11425
11426         if (net == NULL) {
11427                 return;
11428         }
11429         asoc = &stcb->asoc;
11430         SCTP_TCB_LOCK_ASSERT(stcb);
11431         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
11432                 if ((chk->rec.chunk_id.id == SCTP_ECN_ECHO) && (net == chk->whoTo)) {
11433                         /* found a previous ECN_ECHO update it if needed */
11434                         uint32_t cnt, ctsn;
11435
11436                         ecne = mtod(chk->data, struct sctp_ecne_chunk *);
11437                         ctsn = ntohl(ecne->tsn);
11438                         if (SCTP_TSN_GT(high_tsn, ctsn)) {
11439                                 ecne->tsn = htonl(high_tsn);
11440                                 SCTP_STAT_INCR(sctps_queue_upd_ecne);
11441                         }
11442                         cnt = ntohl(ecne->num_pkts_since_cwr);
11443                         cnt++;
11444                         ecne->num_pkts_since_cwr = htonl(cnt);
11445                         return;
11446                 }
11447         }
11448         /* nope could not find one to update so we must build one */
11449         sctp_alloc_a_chunk(stcb, chk);
11450         if (chk == NULL) {
11451                 return;
11452         }
11453         SCTP_STAT_INCR(sctps_queue_upd_ecne);
11454         chk->copy_by_ref = 0;
11455         chk->rec.chunk_id.id = SCTP_ECN_ECHO;
11456         chk->rec.chunk_id.can_take_data = 0;
11457         chk->flags = 0;
11458         chk->asoc = &stcb->asoc;
11459         chk->send_size = sizeof(struct sctp_ecne_chunk);
11460         chk->data = sctp_get_mbuf_for_msg(chk->send_size, 0, M_NOWAIT, 1, MT_HEADER);
11461         if (chk->data == NULL) {
11462                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
11463                 return;
11464         }
11465         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11466         SCTP_BUF_LEN(chk->data) = chk->send_size;
11467         chk->sent = SCTP_DATAGRAM_UNSENT;
11468         chk->snd_count = 0;
11469         chk->whoTo = net;
11470         atomic_add_int(&chk->whoTo->ref_count, 1);
11471
11472         stcb->asoc.ecn_echo_cnt_onq++;
11473         ecne = mtod(chk->data, struct sctp_ecne_chunk *);
11474         ecne->ch.chunk_type = SCTP_ECN_ECHO;
11475         ecne->ch.chunk_flags = 0;
11476         ecne->ch.chunk_length = htons(sizeof(struct sctp_ecne_chunk));
11477         ecne->tsn = htonl(high_tsn);
11478         ecne->num_pkts_since_cwr = htonl(1);
11479         TAILQ_INSERT_HEAD(&stcb->asoc.control_send_queue, chk, sctp_next);
11480         asoc->ctrl_queue_cnt++;
11481 }
11482
11483 void
11484 sctp_send_packet_dropped(struct sctp_tcb *stcb, struct sctp_nets *net,
11485     struct mbuf *m, int len, int iphlen, int bad_crc)
11486 {
11487         struct sctp_association *asoc;
11488         struct sctp_pktdrop_chunk *drp;
11489         struct sctp_tmit_chunk *chk;
11490         uint8_t *datap;
11491         int was_trunc = 0;
11492         int fullsz = 0;
11493         long spc;
11494         int offset;
11495         struct sctp_chunkhdr *ch, chunk_buf;
11496         unsigned int chk_length;
11497
11498         if (!stcb) {
11499                 return;
11500         }
11501         asoc = &stcb->asoc;
11502         SCTP_TCB_LOCK_ASSERT(stcb);
11503         if (asoc->pktdrop_supported == 0) {
11504                 /*-
11505                  * peer must declare support before I send one.
11506                  */
11507                 return;
11508         }
11509         if (stcb->sctp_socket == NULL) {
11510                 return;
11511         }
11512         sctp_alloc_a_chunk(stcb, chk);
11513         if (chk == NULL) {
11514                 return;
11515         }
11516         chk->copy_by_ref = 0;
11517         chk->rec.chunk_id.id = SCTP_PACKET_DROPPED;
11518         chk->rec.chunk_id.can_take_data = 1;
11519         chk->flags = 0;
11520         len -= iphlen;
11521         chk->send_size = len;
11522         /* Validate that we do not have an ABORT in here. */
11523         offset = iphlen + sizeof(struct sctphdr);
11524         ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, offset,
11525             sizeof(*ch), (uint8_t *)&chunk_buf);
11526         while (ch != NULL) {
11527                 chk_length = ntohs(ch->chunk_length);
11528                 if (chk_length < sizeof(*ch)) {
11529                         /* break to abort land */
11530                         break;
11531                 }
11532                 switch (ch->chunk_type) {
11533                 case SCTP_PACKET_DROPPED:
11534                 case SCTP_ABORT_ASSOCIATION:
11535                 case SCTP_INITIATION_ACK:
11536                         /**
11537                          * We don't respond with an PKT-DROP to an ABORT
11538                          * or PKT-DROP. We also do not respond to an
11539                          * INIT-ACK, because we can't know if the initiation
11540                          * tag is correct or not.
11541                          */
11542                         sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
11543                         return;
11544                 default:
11545                         break;
11546                 }
11547                 offset += SCTP_SIZE32(chk_length);
11548                 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, offset,
11549                     sizeof(*ch), (uint8_t *)&chunk_buf);
11550         }
11551
11552         if ((len + SCTP_MAX_OVERHEAD + sizeof(struct sctp_pktdrop_chunk)) >
11553             min(stcb->asoc.smallest_mtu, MCLBYTES)) {
11554                 /*
11555                  * only send 1 mtu worth, trim off the excess on the end.
11556                  */
11557                 fullsz = len;
11558                 len = min(stcb->asoc.smallest_mtu, MCLBYTES) - SCTP_MAX_OVERHEAD;
11559                 was_trunc = 1;
11560         }
11561         chk->asoc = &stcb->asoc;
11562         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
11563         if (chk->data == NULL) {
11564 jump_out:
11565                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
11566                 return;
11567         }
11568         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11569         drp = mtod(chk->data, struct sctp_pktdrop_chunk *);
11570         if (drp == NULL) {
11571                 sctp_m_freem(chk->data);
11572                 chk->data = NULL;
11573                 goto jump_out;
11574         }
11575         chk->book_size = SCTP_SIZE32((chk->send_size + sizeof(struct sctp_pktdrop_chunk) +
11576             sizeof(struct sctphdr) + SCTP_MED_OVERHEAD));
11577         chk->book_size_scale = 0;
11578         if (was_trunc) {
11579                 drp->ch.chunk_flags = SCTP_PACKET_TRUNCATED;
11580                 drp->trunc_len = htons(fullsz);
11581                 /*
11582                  * Len is already adjusted to size minus overhead above take
11583                  * out the pkt_drop chunk itself from it.
11584                  */
11585                 chk->send_size = (uint16_t)(len - sizeof(struct sctp_pktdrop_chunk));
11586                 len = chk->send_size;
11587         } else {
11588                 /* no truncation needed */
11589                 drp->ch.chunk_flags = 0;
11590                 drp->trunc_len = htons(0);
11591         }
11592         if (bad_crc) {
11593                 drp->ch.chunk_flags |= SCTP_BADCRC;
11594         }
11595         chk->send_size += sizeof(struct sctp_pktdrop_chunk);
11596         SCTP_BUF_LEN(chk->data) = chk->send_size;
11597         chk->sent = SCTP_DATAGRAM_UNSENT;
11598         chk->snd_count = 0;
11599         if (net) {
11600                 /* we should hit here */
11601                 chk->whoTo = net;
11602                 atomic_add_int(&chk->whoTo->ref_count, 1);
11603         } else {
11604                 chk->whoTo = NULL;
11605         }
11606         drp->ch.chunk_type = SCTP_PACKET_DROPPED;
11607         drp->ch.chunk_length = htons(chk->send_size);
11608         spc = SCTP_SB_LIMIT_RCV(stcb->sctp_socket);
11609         if (spc < 0) {
11610                 spc = 0;
11611         }
11612         drp->bottle_bw = htonl(spc);
11613         if (asoc->my_rwnd) {
11614                 drp->current_onq = htonl(asoc->size_on_reasm_queue +
11615                     asoc->size_on_all_streams +
11616                     asoc->my_rwnd_control_len +
11617                     stcb->sctp_socket->so_rcv.sb_cc);
11618         } else {
11619                 /*-
11620                  * If my rwnd is 0, possibly from mbuf depletion as well as
11621                  * space used, tell the peer there is NO space aka onq == bw
11622                  */
11623                 drp->current_onq = htonl(spc);
11624         }
11625         drp->reserved = 0;
11626         datap = drp->data;
11627         m_copydata(m, iphlen, len, (caddr_t)datap);
11628         TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
11629         asoc->ctrl_queue_cnt++;
11630 }
11631
11632 void
11633 sctp_send_cwr(struct sctp_tcb *stcb, struct sctp_nets *net, uint32_t high_tsn, uint8_t override)
11634 {
11635         struct sctp_association *asoc;
11636         struct sctp_cwr_chunk *cwr;
11637         struct sctp_tmit_chunk *chk;
11638
11639         SCTP_TCB_LOCK_ASSERT(stcb);
11640         if (net == NULL) {
11641                 return;
11642         }
11643         asoc = &stcb->asoc;
11644         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
11645                 if ((chk->rec.chunk_id.id == SCTP_ECN_CWR) && (net == chk->whoTo)) {
11646                         /*
11647                          * found a previous CWR queued to same destination
11648                          * update it if needed
11649                          */
11650                         uint32_t ctsn;
11651
11652                         cwr = mtod(chk->data, struct sctp_cwr_chunk *);
11653                         ctsn = ntohl(cwr->tsn);
11654                         if (SCTP_TSN_GT(high_tsn, ctsn)) {
11655                                 cwr->tsn = htonl(high_tsn);
11656                         }
11657                         if (override & SCTP_CWR_REDUCE_OVERRIDE) {
11658                                 /* Make sure override is carried */
11659                                 cwr->ch.chunk_flags |= SCTP_CWR_REDUCE_OVERRIDE;
11660                         }
11661                         return;
11662                 }
11663         }
11664         sctp_alloc_a_chunk(stcb, chk);
11665         if (chk == NULL) {
11666                 return;
11667         }
11668         chk->copy_by_ref = 0;
11669         chk->rec.chunk_id.id = SCTP_ECN_CWR;
11670         chk->rec.chunk_id.can_take_data = 1;
11671         chk->flags = 0;
11672         chk->asoc = &stcb->asoc;
11673         chk->send_size = sizeof(struct sctp_cwr_chunk);
11674         chk->data = sctp_get_mbuf_for_msg(chk->send_size, 0, M_NOWAIT, 1, MT_HEADER);
11675         if (chk->data == NULL) {
11676                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
11677                 return;
11678         }
11679         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11680         SCTP_BUF_LEN(chk->data) = chk->send_size;
11681         chk->sent = SCTP_DATAGRAM_UNSENT;
11682         chk->snd_count = 0;
11683         chk->whoTo = net;
11684         atomic_add_int(&chk->whoTo->ref_count, 1);
11685         cwr = mtod(chk->data, struct sctp_cwr_chunk *);
11686         cwr->ch.chunk_type = SCTP_ECN_CWR;
11687         cwr->ch.chunk_flags = override;
11688         cwr->ch.chunk_length = htons(sizeof(struct sctp_cwr_chunk));
11689         cwr->tsn = htonl(high_tsn);
11690         TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
11691         asoc->ctrl_queue_cnt++;
11692 }
11693
11694 static int
11695 sctp_add_stream_reset_out(struct sctp_tcb *stcb, struct sctp_tmit_chunk *chk,
11696     uint32_t seq, uint32_t resp_seq, uint32_t last_sent)
11697 {
11698         uint16_t len, old_len, i;
11699         struct sctp_stream_reset_out_request *req_out;
11700         struct sctp_chunkhdr *ch;
11701         int at;
11702         int number_entries = 0;
11703
11704         ch = mtod(chk->data, struct sctp_chunkhdr *);
11705         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11706         /* get to new offset for the param. */
11707         req_out = (struct sctp_stream_reset_out_request *)((caddr_t)ch + len);
11708         /* now how long will this param be? */
11709         for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
11710                 if ((stcb->asoc.strmout[i].state == SCTP_STREAM_RESET_PENDING) &&
11711                     (stcb->asoc.strmout[i].chunks_on_queues == 0) &&
11712                     TAILQ_EMPTY(&stcb->asoc.strmout[i].outqueue)) {
11713                         number_entries++;
11714                 }
11715         }
11716         if (number_entries == 0) {
11717                 return (0);
11718         }
11719         if (number_entries == stcb->asoc.streamoutcnt) {
11720                 number_entries = 0;
11721         }
11722         if (number_entries > SCTP_MAX_STREAMS_AT_ONCE_RESET) {
11723                 number_entries = SCTP_MAX_STREAMS_AT_ONCE_RESET;
11724         }
11725         len = (uint16_t)(sizeof(struct sctp_stream_reset_out_request) + (sizeof(uint16_t) * number_entries));
11726         req_out->ph.param_type = htons(SCTP_STR_RESET_OUT_REQUEST);
11727         req_out->ph.param_length = htons(len);
11728         req_out->request_seq = htonl(seq);
11729         req_out->response_seq = htonl(resp_seq);
11730         req_out->send_reset_at_tsn = htonl(last_sent);
11731         at = 0;
11732         if (number_entries) {
11733                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
11734                         if ((stcb->asoc.strmout[i].state == SCTP_STREAM_RESET_PENDING) &&
11735                             (stcb->asoc.strmout[i].chunks_on_queues == 0) &&
11736                             TAILQ_EMPTY(&stcb->asoc.strmout[i].outqueue)) {
11737                                 req_out->list_of_streams[at] = htons(i);
11738                                 at++;
11739                                 stcb->asoc.strmout[i].state = SCTP_STREAM_RESET_IN_FLIGHT;
11740                                 if (at >= number_entries) {
11741                                         break;
11742                                 }
11743                         }
11744                 }
11745         } else {
11746                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
11747                         stcb->asoc.strmout[i].state = SCTP_STREAM_RESET_IN_FLIGHT;
11748                 }
11749         }
11750         if (SCTP_SIZE32(len) > len) {
11751                 /*-
11752                  * Need to worry about the pad we may end up adding to the
11753                  * end. This is easy since the struct is either aligned to 4
11754                  * bytes or 2 bytes off.
11755                  */
11756                 req_out->list_of_streams[number_entries] = 0;
11757         }
11758         /* now fix the chunk length */
11759         ch->chunk_length = htons(len + old_len);
11760         chk->book_size = len + old_len;
11761         chk->book_size_scale = 0;
11762         chk->send_size = SCTP_SIZE32(chk->book_size);
11763         SCTP_BUF_LEN(chk->data) = chk->send_size;
11764         return (1);
11765 }
11766
11767 static void
11768 sctp_add_stream_reset_in(struct sctp_tmit_chunk *chk,
11769     int number_entries, uint16_t *list,
11770     uint32_t seq)
11771 {
11772         uint16_t len, old_len, i;
11773         struct sctp_stream_reset_in_request *req_in;
11774         struct sctp_chunkhdr *ch;
11775
11776         ch = mtod(chk->data, struct sctp_chunkhdr *);
11777         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11778
11779         /* get to new offset for the param. */
11780         req_in = (struct sctp_stream_reset_in_request *)((caddr_t)ch + len);
11781         /* now how long will this param be? */
11782         len = (uint16_t)(sizeof(struct sctp_stream_reset_in_request) + (sizeof(uint16_t) * number_entries));
11783         req_in->ph.param_type = htons(SCTP_STR_RESET_IN_REQUEST);
11784         req_in->ph.param_length = htons(len);
11785         req_in->request_seq = htonl(seq);
11786         if (number_entries) {
11787                 for (i = 0; i < number_entries; i++) {
11788                         req_in->list_of_streams[i] = htons(list[i]);
11789                 }
11790         }
11791         if (SCTP_SIZE32(len) > len) {
11792                 /*-
11793                  * Need to worry about the pad we may end up adding to the
11794                  * end. This is easy since the struct is either aligned to 4
11795                  * bytes or 2 bytes off.
11796                  */
11797                 req_in->list_of_streams[number_entries] = 0;
11798         }
11799         /* now fix the chunk length */
11800         ch->chunk_length = htons(len + old_len);
11801         chk->book_size = len + old_len;
11802         chk->book_size_scale = 0;
11803         chk->send_size = SCTP_SIZE32(chk->book_size);
11804         SCTP_BUF_LEN(chk->data) = chk->send_size;
11805         return;
11806 }
11807
11808 static void
11809 sctp_add_stream_reset_tsn(struct sctp_tmit_chunk *chk,
11810     uint32_t seq)
11811 {
11812         uint16_t len, old_len;
11813         struct sctp_stream_reset_tsn_request *req_tsn;
11814         struct sctp_chunkhdr *ch;
11815
11816         ch = mtod(chk->data, struct sctp_chunkhdr *);
11817         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11818
11819         /* get to new offset for the param. */
11820         req_tsn = (struct sctp_stream_reset_tsn_request *)((caddr_t)ch + len);
11821         /* now how long will this param be? */
11822         len = sizeof(struct sctp_stream_reset_tsn_request);
11823         req_tsn->ph.param_type = htons(SCTP_STR_RESET_TSN_REQUEST);
11824         req_tsn->ph.param_length = htons(len);
11825         req_tsn->request_seq = htonl(seq);
11826
11827         /* now fix the chunk length */
11828         ch->chunk_length = htons(len + old_len);
11829         chk->send_size = len + old_len;
11830         chk->book_size = SCTP_SIZE32(chk->send_size);
11831         chk->book_size_scale = 0;
11832         SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size);
11833         return;
11834 }
11835
11836 void
11837 sctp_add_stream_reset_result(struct sctp_tmit_chunk *chk,
11838     uint32_t resp_seq, uint32_t result)
11839 {
11840         uint16_t len, old_len;
11841         struct sctp_stream_reset_response *resp;
11842         struct sctp_chunkhdr *ch;
11843
11844         ch = mtod(chk->data, struct sctp_chunkhdr *);
11845         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11846
11847         /* get to new offset for the param. */
11848         resp = (struct sctp_stream_reset_response *)((caddr_t)ch + len);
11849         /* now how long will this param be? */
11850         len = sizeof(struct sctp_stream_reset_response);
11851         resp->ph.param_type = htons(SCTP_STR_RESET_RESPONSE);
11852         resp->ph.param_length = htons(len);
11853         resp->response_seq = htonl(resp_seq);
11854         resp->result = ntohl(result);
11855
11856         /* now fix the chunk length */
11857         ch->chunk_length = htons(len + old_len);
11858         chk->book_size = len + old_len;
11859         chk->book_size_scale = 0;
11860         chk->send_size = SCTP_SIZE32(chk->book_size);
11861         SCTP_BUF_LEN(chk->data) = chk->send_size;
11862         return;
11863 }
11864
11865 void
11866 sctp_send_deferred_reset_response(struct sctp_tcb *stcb,
11867     struct sctp_stream_reset_list *ent,
11868     int response)
11869 {
11870         struct sctp_association *asoc;
11871         struct sctp_tmit_chunk *chk;
11872         struct sctp_chunkhdr *ch;
11873
11874         asoc = &stcb->asoc;
11875
11876         /*
11877          * Reset our last reset action to the new one IP -> response
11878          * (PERFORMED probably). This assures that if we fail to send, a
11879          * retran from the peer will get the new response.
11880          */
11881         asoc->last_reset_action[0] = response;
11882         if (asoc->stream_reset_outstanding) {
11883                 return;
11884         }
11885         sctp_alloc_a_chunk(stcb, chk);
11886         if (chk == NULL) {
11887                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
11888                 return;
11889         }
11890         chk->copy_by_ref = 0;
11891         chk->rec.chunk_id.id = SCTP_STREAM_RESET;
11892         chk->rec.chunk_id.can_take_data = 0;
11893         chk->flags = 0;
11894         chk->asoc = &stcb->asoc;
11895         chk->book_size = sizeof(struct sctp_chunkhdr);
11896         chk->send_size = SCTP_SIZE32(chk->book_size);
11897         chk->book_size_scale = 0;
11898         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
11899         if (chk->data == NULL) {
11900                 sctp_free_a_chunk(stcb, chk, SCTP_SO_LOCKED);
11901                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
11902                 return;
11903         }
11904         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11905         /* setup chunk parameters */
11906         chk->sent = SCTP_DATAGRAM_UNSENT;
11907         chk->snd_count = 0;
11908         if (stcb->asoc.alternate) {
11909                 chk->whoTo = stcb->asoc.alternate;
11910         } else {
11911                 chk->whoTo = stcb->asoc.primary_destination;
11912         }
11913         ch = mtod(chk->data, struct sctp_chunkhdr *);
11914         ch->chunk_type = SCTP_STREAM_RESET;
11915         ch->chunk_flags = 0;
11916         ch->chunk_length = htons(chk->book_size);
11917         atomic_add_int(&chk->whoTo->ref_count, 1);
11918         SCTP_BUF_LEN(chk->data) = chk->send_size;
11919         sctp_add_stream_reset_result(chk, ent->seq, response);
11920         /* insert the chunk for sending */
11921         TAILQ_INSERT_TAIL(&asoc->control_send_queue,
11922             chk,
11923             sctp_next);
11924         asoc->ctrl_queue_cnt++;
11925 }
11926
11927 void
11928 sctp_add_stream_reset_result_tsn(struct sctp_tmit_chunk *chk,
11929     uint32_t resp_seq, uint32_t result,
11930     uint32_t send_una, uint32_t recv_next)
11931 {
11932         uint16_t len, old_len;
11933         struct sctp_stream_reset_response_tsn *resp;
11934         struct sctp_chunkhdr *ch;
11935
11936         ch = mtod(chk->data, struct sctp_chunkhdr *);
11937         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11938
11939         /* get to new offset for the param. */
11940         resp = (struct sctp_stream_reset_response_tsn *)((caddr_t)ch + len);
11941         /* now how long will this param be? */
11942         len = sizeof(struct sctp_stream_reset_response_tsn);
11943         resp->ph.param_type = htons(SCTP_STR_RESET_RESPONSE);
11944         resp->ph.param_length = htons(len);
11945         resp->response_seq = htonl(resp_seq);
11946         resp->result = htonl(result);
11947         resp->senders_next_tsn = htonl(send_una);
11948         resp->receivers_next_tsn = htonl(recv_next);
11949
11950         /* now fix the chunk length */
11951         ch->chunk_length = htons(len + old_len);
11952         chk->book_size = len + old_len;
11953         chk->send_size = SCTP_SIZE32(chk->book_size);
11954         chk->book_size_scale = 0;
11955         SCTP_BUF_LEN(chk->data) = chk->send_size;
11956         return;
11957 }
11958
11959 static void
11960 sctp_add_an_out_stream(struct sctp_tmit_chunk *chk,
11961     uint32_t seq,
11962     uint16_t adding)
11963 {
11964         uint16_t len, old_len;
11965         struct sctp_chunkhdr *ch;
11966         struct sctp_stream_reset_add_strm *addstr;
11967
11968         ch = mtod(chk->data, struct sctp_chunkhdr *);
11969         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11970
11971         /* get to new offset for the param. */
11972         addstr = (struct sctp_stream_reset_add_strm *)((caddr_t)ch + len);
11973         /* now how long will this param be? */
11974         len = sizeof(struct sctp_stream_reset_add_strm);
11975
11976         /* Fill it out. */
11977         addstr->ph.param_type = htons(SCTP_STR_RESET_ADD_OUT_STREAMS);
11978         addstr->ph.param_length = htons(len);
11979         addstr->request_seq = htonl(seq);
11980         addstr->number_of_streams = htons(adding);
11981         addstr->reserved = 0;
11982
11983         /* now fix the chunk length */
11984         ch->chunk_length = htons(len + old_len);
11985         chk->send_size = len + old_len;
11986         chk->book_size = SCTP_SIZE32(chk->send_size);
11987         chk->book_size_scale = 0;
11988         SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size);
11989         return;
11990 }
11991
11992 static void
11993 sctp_add_an_in_stream(struct sctp_tmit_chunk *chk,
11994     uint32_t seq,
11995     uint16_t adding)
11996 {
11997         uint16_t len, old_len;
11998         struct sctp_chunkhdr *ch;
11999         struct sctp_stream_reset_add_strm *addstr;
12000
12001         ch = mtod(chk->data, struct sctp_chunkhdr *);
12002         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
12003
12004         /* get to new offset for the param. */
12005         addstr = (struct sctp_stream_reset_add_strm *)((caddr_t)ch + len);
12006         /* now how long will this param be? */
12007         len = sizeof(struct sctp_stream_reset_add_strm);
12008         /* Fill it out. */
12009         addstr->ph.param_type = htons(SCTP_STR_RESET_ADD_IN_STREAMS);
12010         addstr->ph.param_length = htons(len);
12011         addstr->request_seq = htonl(seq);
12012         addstr->number_of_streams = htons(adding);
12013         addstr->reserved = 0;
12014
12015         /* now fix the chunk length */
12016         ch->chunk_length = htons(len + old_len);
12017         chk->send_size = len + old_len;
12018         chk->book_size = SCTP_SIZE32(chk->send_size);
12019         chk->book_size_scale = 0;
12020         SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size);
12021         return;
12022 }
12023
12024 int
12025 sctp_send_stream_reset_out_if_possible(struct sctp_tcb *stcb, int so_locked)
12026 {
12027         struct sctp_association *asoc;
12028         struct sctp_tmit_chunk *chk;
12029         struct sctp_chunkhdr *ch;
12030         uint32_t seq;
12031
12032         asoc = &stcb->asoc;
12033         asoc->trigger_reset = 0;
12034         if (asoc->stream_reset_outstanding) {
12035                 return (EALREADY);
12036         }
12037         sctp_alloc_a_chunk(stcb, chk);
12038         if (chk == NULL) {
12039                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12040                 return (ENOMEM);
12041         }
12042         chk->copy_by_ref = 0;
12043         chk->rec.chunk_id.id = SCTP_STREAM_RESET;
12044         chk->rec.chunk_id.can_take_data = 0;
12045         chk->flags = 0;
12046         chk->asoc = &stcb->asoc;
12047         chk->book_size = sizeof(struct sctp_chunkhdr);
12048         chk->send_size = SCTP_SIZE32(chk->book_size);
12049         chk->book_size_scale = 0;
12050         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
12051         if (chk->data == NULL) {
12052                 sctp_free_a_chunk(stcb, chk, so_locked);
12053                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12054                 return (ENOMEM);
12055         }
12056         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
12057
12058         /* setup chunk parameters */
12059         chk->sent = SCTP_DATAGRAM_UNSENT;
12060         chk->snd_count = 0;
12061         if (stcb->asoc.alternate) {
12062                 chk->whoTo = stcb->asoc.alternate;
12063         } else {
12064                 chk->whoTo = stcb->asoc.primary_destination;
12065         }
12066         ch = mtod(chk->data, struct sctp_chunkhdr *);
12067         ch->chunk_type = SCTP_STREAM_RESET;
12068         ch->chunk_flags = 0;
12069         ch->chunk_length = htons(chk->book_size);
12070         atomic_add_int(&chk->whoTo->ref_count, 1);
12071         SCTP_BUF_LEN(chk->data) = chk->send_size;
12072         seq = stcb->asoc.str_reset_seq_out;
12073         if (sctp_add_stream_reset_out(stcb, chk, seq, (stcb->asoc.str_reset_seq_in - 1), (stcb->asoc.sending_seq - 1))) {
12074                 seq++;
12075                 asoc->stream_reset_outstanding++;
12076         } else {
12077                 m_freem(chk->data);
12078                 chk->data = NULL;
12079                 sctp_free_a_chunk(stcb, chk, so_locked);
12080                 return (ENOENT);
12081         }
12082         asoc->str_reset = chk;
12083         /* insert the chunk for sending */
12084         TAILQ_INSERT_TAIL(&asoc->control_send_queue,
12085             chk,
12086             sctp_next);
12087         asoc->ctrl_queue_cnt++;
12088
12089         if (stcb->asoc.send_sack) {
12090                 sctp_send_sack(stcb, so_locked);
12091         }
12092         sctp_timer_start(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb, chk->whoTo);
12093         return (0);
12094 }
12095
12096 int
12097 sctp_send_str_reset_req(struct sctp_tcb *stcb,
12098     uint16_t number_entries, uint16_t *list,
12099     uint8_t send_in_req,
12100     uint8_t send_tsn_req,
12101     uint8_t add_stream,
12102     uint16_t adding_o,
12103     uint16_t adding_i, uint8_t peer_asked)
12104 {
12105         struct sctp_association *asoc;
12106         struct sctp_tmit_chunk *chk;
12107         struct sctp_chunkhdr *ch;
12108         int can_send_out_req = 0;
12109         uint32_t seq;
12110
12111         asoc = &stcb->asoc;
12112         if (asoc->stream_reset_outstanding) {
12113                 /*-
12114                  * Already one pending, must get ACK back to clear the flag.
12115                  */
12116                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EBUSY);
12117                 return (EBUSY);
12118         }
12119         if ((send_in_req == 0) && (send_tsn_req == 0) &&
12120             (add_stream == 0)) {
12121                 /* nothing to do */
12122                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12123                 return (EINVAL);
12124         }
12125         if (send_tsn_req && send_in_req) {
12126                 /* error, can't do that */
12127                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12128                 return (EINVAL);
12129         } else if (send_in_req) {
12130                 can_send_out_req = 1;
12131         }
12132         if (number_entries > (MCLBYTES -
12133             SCTP_MIN_OVERHEAD -
12134             sizeof(struct sctp_chunkhdr) -
12135             sizeof(struct sctp_stream_reset_out_request)) /
12136             sizeof(uint16_t)) {
12137                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12138                 return (ENOMEM);
12139         }
12140         sctp_alloc_a_chunk(stcb, chk);
12141         if (chk == NULL) {
12142                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12143                 return (ENOMEM);
12144         }
12145         chk->copy_by_ref = 0;
12146         chk->rec.chunk_id.id = SCTP_STREAM_RESET;
12147         chk->rec.chunk_id.can_take_data = 0;
12148         chk->flags = 0;
12149         chk->asoc = &stcb->asoc;
12150         chk->book_size = sizeof(struct sctp_chunkhdr);
12151         chk->send_size = SCTP_SIZE32(chk->book_size);
12152         chk->book_size_scale = 0;
12153
12154         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
12155         if (chk->data == NULL) {
12156                 sctp_free_a_chunk(stcb, chk, SCTP_SO_LOCKED);
12157                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12158                 return (ENOMEM);
12159         }
12160         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
12161
12162         /* setup chunk parameters */
12163         chk->sent = SCTP_DATAGRAM_UNSENT;
12164         chk->snd_count = 0;
12165         if (stcb->asoc.alternate) {
12166                 chk->whoTo = stcb->asoc.alternate;
12167         } else {
12168                 chk->whoTo = stcb->asoc.primary_destination;
12169         }
12170         atomic_add_int(&chk->whoTo->ref_count, 1);
12171         ch = mtod(chk->data, struct sctp_chunkhdr *);
12172         ch->chunk_type = SCTP_STREAM_RESET;
12173         ch->chunk_flags = 0;
12174         ch->chunk_length = htons(chk->book_size);
12175         SCTP_BUF_LEN(chk->data) = chk->send_size;
12176
12177         seq = stcb->asoc.str_reset_seq_out;
12178         if (can_send_out_req) {
12179                 int ret;
12180
12181                 ret = sctp_add_stream_reset_out(stcb, chk, seq, (stcb->asoc.str_reset_seq_in - 1), (stcb->asoc.sending_seq - 1));
12182                 if (ret) {
12183                         seq++;
12184                         asoc->stream_reset_outstanding++;
12185                 }
12186         }
12187         if ((add_stream & 1) &&
12188             ((stcb->asoc.strm_realoutsize - stcb->asoc.streamoutcnt) < adding_o)) {
12189                 /* Need to allocate more */
12190                 struct sctp_stream_out *oldstream;
12191                 struct sctp_stream_queue_pending *sp, *nsp;
12192                 int i;
12193 #if defined(SCTP_DETAILED_STR_STATS)
12194                 int j;
12195 #endif
12196
12197                 oldstream = stcb->asoc.strmout;
12198                 /* get some more */
12199                 SCTP_MALLOC(stcb->asoc.strmout, struct sctp_stream_out *,
12200                     (stcb->asoc.streamoutcnt + adding_o) * sizeof(struct sctp_stream_out),
12201                     SCTP_M_STRMO);
12202                 if (stcb->asoc.strmout == NULL) {
12203                         uint8_t x;
12204
12205                         stcb->asoc.strmout = oldstream;
12206                         /* Turn off the bit */
12207                         x = add_stream & 0xfe;
12208                         add_stream = x;
12209                         goto skip_stuff;
12210                 }
12211                 /*
12212                  * Ok now we proceed with copying the old out stuff and
12213                  * initializing the new stuff.
12214                  */
12215                 SCTP_TCB_SEND_LOCK(stcb);
12216                 stcb->asoc.ss_functions.sctp_ss_clear(stcb, &stcb->asoc, 0, 1);
12217                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
12218                         TAILQ_INIT(&stcb->asoc.strmout[i].outqueue);
12219                         stcb->asoc.strmout[i].chunks_on_queues = oldstream[i].chunks_on_queues;
12220                         stcb->asoc.strmout[i].next_mid_ordered = oldstream[i].next_mid_ordered;
12221                         stcb->asoc.strmout[i].next_mid_unordered = oldstream[i].next_mid_unordered;
12222                         stcb->asoc.strmout[i].last_msg_incomplete = oldstream[i].last_msg_incomplete;
12223                         stcb->asoc.strmout[i].sid = i;
12224                         stcb->asoc.strmout[i].state = oldstream[i].state;
12225                         /* FIX ME FIX ME */
12226                         /*
12227                          * This should be a SS_COPY operation FIX ME STREAM
12228                          * SCHEDULER EXPERT
12229                          */
12230                         stcb->asoc.ss_functions.sctp_ss_init_stream(stcb, &stcb->asoc.strmout[i], &oldstream[i]);
12231                         /* now anything on those queues? */
12232                         TAILQ_FOREACH_SAFE(sp, &oldstream[i].outqueue, next, nsp) {
12233                                 TAILQ_REMOVE(&oldstream[i].outqueue, sp, next);
12234                                 TAILQ_INSERT_TAIL(&stcb->asoc.strmout[i].outqueue, sp, next);
12235                         }
12236
12237                 }
12238                 /* now the new streams */
12239                 stcb->asoc.ss_functions.sctp_ss_init(stcb, &stcb->asoc, 1);
12240                 for (i = stcb->asoc.streamoutcnt; i < (stcb->asoc.streamoutcnt + adding_o); i++) {
12241                         TAILQ_INIT(&stcb->asoc.strmout[i].outqueue);
12242                         stcb->asoc.strmout[i].chunks_on_queues = 0;
12243 #if defined(SCTP_DETAILED_STR_STATS)
12244                         for (j = 0; j < SCTP_PR_SCTP_MAX + 1; j++) {
12245                                 stcb->asoc.strmout[i].abandoned_sent[j] = 0;
12246                                 stcb->asoc.strmout[i].abandoned_unsent[j] = 0;
12247                         }
12248 #else
12249                         stcb->asoc.strmout[i].abandoned_sent[0] = 0;
12250                         stcb->asoc.strmout[i].abandoned_unsent[0] = 0;
12251 #endif
12252                         stcb->asoc.strmout[i].next_mid_ordered = 0;
12253                         stcb->asoc.strmout[i].next_mid_unordered = 0;
12254                         stcb->asoc.strmout[i].sid = i;
12255                         stcb->asoc.strmout[i].last_msg_incomplete = 0;
12256                         stcb->asoc.ss_functions.sctp_ss_init_stream(stcb, &stcb->asoc.strmout[i], NULL);
12257                         stcb->asoc.strmout[i].state = SCTP_STREAM_CLOSED;
12258                 }
12259                 stcb->asoc.strm_realoutsize = stcb->asoc.streamoutcnt + adding_o;
12260                 SCTP_FREE(oldstream, SCTP_M_STRMO);
12261                 SCTP_TCB_SEND_UNLOCK(stcb);
12262         }
12263 skip_stuff:
12264         if ((add_stream & 1) && (adding_o > 0)) {
12265                 asoc->strm_pending_add_size = adding_o;
12266                 asoc->peer_req_out = peer_asked;
12267                 sctp_add_an_out_stream(chk, seq, adding_o);
12268                 seq++;
12269                 asoc->stream_reset_outstanding++;
12270         }
12271         if ((add_stream & 2) && (adding_i > 0)) {
12272                 sctp_add_an_in_stream(chk, seq, adding_i);
12273                 seq++;
12274                 asoc->stream_reset_outstanding++;
12275         }
12276         if (send_in_req) {
12277                 sctp_add_stream_reset_in(chk, number_entries, list, seq);
12278                 seq++;
12279                 asoc->stream_reset_outstanding++;
12280         }
12281         if (send_tsn_req) {
12282                 sctp_add_stream_reset_tsn(chk, seq);
12283                 asoc->stream_reset_outstanding++;
12284         }
12285         asoc->str_reset = chk;
12286         /* insert the chunk for sending */
12287         TAILQ_INSERT_TAIL(&asoc->control_send_queue,
12288             chk,
12289             sctp_next);
12290         asoc->ctrl_queue_cnt++;
12291         if (stcb->asoc.send_sack) {
12292                 sctp_send_sack(stcb, SCTP_SO_LOCKED);
12293         }
12294         sctp_timer_start(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb, chk->whoTo);
12295         return (0);
12296 }
12297
12298 void
12299 sctp_send_abort(struct mbuf *m, int iphlen, struct sockaddr *src, struct sockaddr *dst,
12300     struct sctphdr *sh, uint32_t vtag, struct mbuf *cause,
12301     uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum,
12302     uint32_t vrf_id, uint16_t port)
12303 {
12304         /* Don't respond to an ABORT with an ABORT. */
12305         if (sctp_is_there_an_abort_here(m, iphlen, &vtag)) {
12306                 if (cause)
12307                         sctp_m_freem(cause);
12308                 return;
12309         }
12310         sctp_send_resp_msg(src, dst, sh, vtag, SCTP_ABORT_ASSOCIATION, cause,
12311             mflowtype, mflowid, fibnum,
12312             vrf_id, port);
12313         return;
12314 }
12315
12316 void
12317 sctp_send_operr_to(struct sockaddr *src, struct sockaddr *dst,
12318     struct sctphdr *sh, uint32_t vtag, struct mbuf *cause,
12319     uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum,
12320     uint32_t vrf_id, uint16_t port)
12321 {
12322         sctp_send_resp_msg(src, dst, sh, vtag, SCTP_OPERATION_ERROR, cause,
12323             mflowtype, mflowid, fibnum,
12324             vrf_id, port);
12325         return;
12326 }
12327
12328 static struct mbuf *
12329 sctp_copy_resume(struct uio *uio,
12330     int max_send_len,
12331     int user_marks_eor,
12332     int *error,
12333     uint32_t *sndout,
12334     struct mbuf **new_tail)
12335 {
12336         struct mbuf *m;
12337
12338         m = m_uiotombuf(uio, M_WAITOK, max_send_len, 0,
12339             (M_PKTHDR | (user_marks_eor ? M_EOR : 0)));
12340         if (m == NULL) {
12341                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOBUFS);
12342                 *error = ENOBUFS;
12343         } else {
12344                 *sndout = m_length(m, NULL);
12345                 *new_tail = m_last(m);
12346         }
12347         return (m);
12348 }
12349
12350 static int
12351 sctp_copy_one(struct sctp_stream_queue_pending *sp,
12352     struct uio *uio,
12353     int resv_upfront)
12354 {
12355         sp->data = m_uiotombuf(uio, M_WAITOK, sp->length,
12356             resv_upfront, 0);
12357         if (sp->data == NULL) {
12358                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOBUFS);
12359                 return (ENOBUFS);
12360         }
12361
12362         sp->tail_mbuf = m_last(sp->data);
12363         return (0);
12364 }
12365
12366
12367
12368 static struct sctp_stream_queue_pending *
12369 sctp_copy_it_in(struct sctp_tcb *stcb,
12370     struct sctp_association *asoc,
12371     struct sctp_sndrcvinfo *srcv,
12372     struct uio *uio,
12373     struct sctp_nets *net,
12374     int max_send_len,
12375     int user_marks_eor,
12376     int *error)
12377 {
12378
12379         /*-
12380          * This routine must be very careful in its work. Protocol
12381          * processing is up and running so care must be taken to spl...()
12382          * when you need to do something that may effect the stcb/asoc. The
12383          * sb is locked however. When data is copied the protocol processing
12384          * should be enabled since this is a slower operation...
12385          */
12386         struct sctp_stream_queue_pending *sp = NULL;
12387         int resv_in_first;
12388
12389         *error = 0;
12390         /* Now can we send this? */
12391         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_SENT) ||
12392             (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) ||
12393             (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED) ||
12394             (asoc->state & SCTP_STATE_SHUTDOWN_PENDING)) {
12395                 /* got data while shutting down */
12396                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
12397                 *error = ECONNRESET;
12398                 goto out_now;
12399         }
12400         sctp_alloc_a_strmoq(stcb, sp);
12401         if (sp == NULL) {
12402                 SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12403                 *error = ENOMEM;
12404                 goto out_now;
12405         }
12406         sp->act_flags = 0;
12407         sp->sender_all_done = 0;
12408         sp->sinfo_flags = srcv->sinfo_flags;
12409         sp->timetolive = srcv->sinfo_timetolive;
12410         sp->ppid = srcv->sinfo_ppid;
12411         sp->context = srcv->sinfo_context;
12412         sp->fsn = 0;
12413         (void)SCTP_GETTIME_TIMEVAL(&sp->ts);
12414
12415         sp->sid = srcv->sinfo_stream;
12416         sp->length = (uint32_t)min(uio->uio_resid, max_send_len);
12417         if ((sp->length == (uint32_t)uio->uio_resid) &&
12418             ((user_marks_eor == 0) ||
12419             (srcv->sinfo_flags & SCTP_EOF) ||
12420             (user_marks_eor && (srcv->sinfo_flags & SCTP_EOR)))) {
12421                 sp->msg_is_complete = 1;
12422         } else {
12423                 sp->msg_is_complete = 0;
12424         }
12425         sp->sender_all_done = 0;
12426         sp->some_taken = 0;
12427         sp->put_last_out = 0;
12428         resv_in_first = SCTP_DATA_CHUNK_OVERHEAD(stcb);
12429         sp->data = sp->tail_mbuf = NULL;
12430         if (sp->length == 0) {
12431                 goto skip_copy;
12432         }
12433         if (srcv->sinfo_keynumber_valid) {
12434                 sp->auth_keyid = srcv->sinfo_keynumber;
12435         } else {
12436                 sp->auth_keyid = stcb->asoc.authinfo.active_keyid;
12437         }
12438         if (sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks)) {
12439                 sctp_auth_key_acquire(stcb, sp->auth_keyid);
12440                 sp->holds_key_ref = 1;
12441         }
12442         *error = sctp_copy_one(sp, uio, resv_in_first);
12443 skip_copy:
12444         if (*error) {
12445                 sctp_free_a_strmoq(stcb, sp, SCTP_SO_LOCKED);
12446                 sp = NULL;
12447         } else {
12448                 if (sp->sinfo_flags & SCTP_ADDR_OVER) {
12449                         sp->net = net;
12450                         atomic_add_int(&sp->net->ref_count, 1);
12451                 } else {
12452                         sp->net = NULL;
12453                 }
12454                 sctp_set_prsctp_policy(sp);
12455         }
12456 out_now:
12457         return (sp);
12458 }
12459
12460
12461 int
12462 sctp_sosend(struct socket *so,
12463     struct sockaddr *addr,
12464     struct uio *uio,
12465     struct mbuf *top,
12466     struct mbuf *control,
12467     int flags,
12468     struct thread *p
12469 )
12470 {
12471         int error, use_sndinfo = 0;
12472         struct sctp_sndrcvinfo sndrcvninfo;
12473         struct sockaddr *addr_to_use;
12474 #if defined(INET) && defined(INET6)
12475         struct sockaddr_in sin;
12476 #endif
12477
12478         if (control) {
12479                 /* process cmsg snd/rcv info (maybe a assoc-id) */
12480                 if (sctp_find_cmsg(SCTP_SNDRCV, (void *)&sndrcvninfo, control,
12481                     sizeof(sndrcvninfo))) {
12482                         /* got one */
12483                         use_sndinfo = 1;
12484                 }
12485         }
12486         addr_to_use = addr;
12487 #if defined(INET) && defined(INET6)
12488         if ((addr) && (addr->sa_family == AF_INET6)) {
12489                 struct sockaddr_in6 *sin6;
12490
12491                 sin6 = (struct sockaddr_in6 *)addr;
12492                 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
12493                         in6_sin6_2_sin(&sin, sin6);
12494                         addr_to_use = (struct sockaddr *)&sin;
12495                 }
12496         }
12497 #endif
12498         error = sctp_lower_sosend(so, addr_to_use, uio, top,
12499             control,
12500             flags,
12501             use_sndinfo ? &sndrcvninfo : NULL
12502             ,p
12503             );
12504         return (error);
12505 }
12506
12507
12508 int
12509 sctp_lower_sosend(struct socket *so,
12510     struct sockaddr *addr,
12511     struct uio *uio,
12512     struct mbuf *i_pak,
12513     struct mbuf *control,
12514     int flags,
12515     struct sctp_sndrcvinfo *srcv
12516     ,
12517     struct thread *p
12518 )
12519 {
12520         unsigned int sndlen = 0, max_len;
12521         int error, len;
12522         struct mbuf *top = NULL;
12523         int queue_only = 0, queue_only_for_init = 0;
12524         int free_cnt_applied = 0;
12525         int un_sent;
12526         int now_filled = 0;
12527         unsigned int inqueue_bytes = 0;
12528         struct sctp_block_entry be;
12529         struct sctp_inpcb *inp;
12530         struct sctp_tcb *stcb = NULL;
12531         struct timeval now;
12532         struct sctp_nets *net;
12533         struct sctp_association *asoc;
12534         struct sctp_inpcb *t_inp;
12535         int user_marks_eor;
12536         int create_lock_applied = 0;
12537         int nagle_applies = 0;
12538         int some_on_control = 0;
12539         int got_all_of_the_send = 0;
12540         int hold_tcblock = 0;
12541         int non_blocking = 0;
12542         uint32_t local_add_more, local_soresv = 0;
12543         uint16_t port;
12544         uint16_t sinfo_flags;
12545         sctp_assoc_t sinfo_assoc_id;
12546
12547         error = 0;
12548         net = NULL;
12549         stcb = NULL;
12550         asoc = NULL;
12551
12552         t_inp = inp = (struct sctp_inpcb *)so->so_pcb;
12553         if (inp == NULL) {
12554                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12555                 error = EINVAL;
12556                 if (i_pak) {
12557                         SCTP_RELEASE_PKT(i_pak);
12558                 }
12559                 return (error);
12560         }
12561         if ((uio == NULL) && (i_pak == NULL)) {
12562                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12563                 return (EINVAL);
12564         }
12565         user_marks_eor = sctp_is_feature_on(inp, SCTP_PCB_FLAGS_EXPLICIT_EOR);
12566         atomic_add_int(&inp->total_sends, 1);
12567         if (uio) {
12568                 if (uio->uio_resid < 0) {
12569                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12570                         return (EINVAL);
12571                 }
12572                 sndlen = (unsigned int)uio->uio_resid;
12573         } else {
12574                 top = SCTP_HEADER_TO_CHAIN(i_pak);
12575                 sndlen = SCTP_HEADER_LEN(i_pak);
12576         }
12577         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Send called addr:%p send length %d\n",
12578             (void *)addr,
12579             sndlen);
12580         if ((inp->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) &&
12581             SCTP_IS_LISTENING(inp)) {
12582                 /* The listener can NOT send */
12583                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOTCONN);
12584                 error = ENOTCONN;
12585                 goto out_unlocked;
12586         }
12587         /**
12588          * Pre-screen address, if one is given the sin-len
12589          * must be set correctly!
12590          */
12591         if (addr) {
12592                 union sctp_sockstore *raddr = (union sctp_sockstore *)addr;
12593
12594                 switch (raddr->sa.sa_family) {
12595 #ifdef INET
12596                 case AF_INET:
12597                         if (raddr->sin.sin_len != sizeof(struct sockaddr_in)) {
12598                                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12599                                 error = EINVAL;
12600                                 goto out_unlocked;
12601                         }
12602                         port = raddr->sin.sin_port;
12603                         break;
12604 #endif
12605 #ifdef INET6
12606                 case AF_INET6:
12607                         if (raddr->sin6.sin6_len != sizeof(struct sockaddr_in6)) {
12608                                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12609                                 error = EINVAL;
12610                                 goto out_unlocked;
12611                         }
12612                         port = raddr->sin6.sin6_port;
12613                         break;
12614 #endif
12615                 default:
12616                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EAFNOSUPPORT);
12617                         error = EAFNOSUPPORT;
12618                         goto out_unlocked;
12619                 }
12620         } else
12621                 port = 0;
12622
12623         if (srcv) {
12624                 sinfo_flags = srcv->sinfo_flags;
12625                 sinfo_assoc_id = srcv->sinfo_assoc_id;
12626                 if (INVALID_SINFO_FLAG(sinfo_flags) ||
12627                     PR_SCTP_INVALID_POLICY(sinfo_flags)) {
12628                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12629                         error = EINVAL;
12630                         goto out_unlocked;
12631                 }
12632                 if (srcv->sinfo_flags)
12633                         SCTP_STAT_INCR(sctps_sends_with_flags);
12634         } else {
12635                 sinfo_flags = inp->def_send.sinfo_flags;
12636                 sinfo_assoc_id = inp->def_send.sinfo_assoc_id;
12637         }
12638         if (sinfo_flags & SCTP_SENDALL) {
12639                 /* its a sendall */
12640                 error = sctp_sendall(inp, uio, top, srcv);
12641                 top = NULL;
12642                 goto out_unlocked;
12643         }
12644         if ((sinfo_flags & SCTP_ADDR_OVER) && (addr == NULL)) {
12645                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12646                 error = EINVAL;
12647                 goto out_unlocked;
12648         }
12649         /* now we must find the assoc */
12650         if ((inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) ||
12651             (inp->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) {
12652                 SCTP_INP_RLOCK(inp);
12653                 stcb = LIST_FIRST(&inp->sctp_asoc_list);
12654                 if (stcb) {
12655                         SCTP_TCB_LOCK(stcb);
12656                         hold_tcblock = 1;
12657                 }
12658                 SCTP_INP_RUNLOCK(inp);
12659         } else if (sinfo_assoc_id) {
12660                 stcb = sctp_findassociation_ep_asocid(inp, sinfo_assoc_id, 1);
12661                 if (stcb != NULL) {
12662                         hold_tcblock = 1;
12663                 }
12664         } else if (addr) {
12665                 /*-
12666                  * Since we did not use findep we must
12667                  * increment it, and if we don't find a tcb
12668                  * decrement it.
12669                  */
12670                 SCTP_INP_WLOCK(inp);
12671                 SCTP_INP_INCR_REF(inp);
12672                 SCTP_INP_WUNLOCK(inp);
12673                 stcb = sctp_findassociation_ep_addr(&t_inp, addr, &net, NULL, NULL);
12674                 if (stcb == NULL) {
12675                         SCTP_INP_WLOCK(inp);
12676                         SCTP_INP_DECR_REF(inp);
12677                         SCTP_INP_WUNLOCK(inp);
12678                 } else {
12679                         hold_tcblock = 1;
12680                 }
12681         }
12682         if ((stcb == NULL) && (addr)) {
12683                 /* Possible implicit send? */
12684                 SCTP_ASOC_CREATE_LOCK(inp);
12685                 create_lock_applied = 1;
12686                 if ((inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) ||
12687                     (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE)) {
12688                         /* Should I really unlock ? */
12689                         SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12690                         error = EINVAL;
12691                         goto out_unlocked;
12692
12693                 }
12694                 if (((inp->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) == 0) &&
12695                     (addr->sa_family == AF_INET6)) {
12696                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12697                         error = EINVAL;
12698                         goto out_unlocked;
12699                 }
12700                 SCTP_INP_WLOCK(inp);
12701                 SCTP_INP_INCR_REF(inp);
12702                 SCTP_INP_WUNLOCK(inp);
12703                 /* With the lock applied look again */
12704                 stcb = sctp_findassociation_ep_addr(&t_inp, addr, &net, NULL, NULL);
12705                 if ((stcb == NULL) && (control != NULL) && (port > 0)) {
12706                         stcb = sctp_findassociation_cmsgs(&t_inp, port, control, &net, &error);
12707                 }
12708                 if (stcb == NULL) {
12709                         SCTP_INP_WLOCK(inp);
12710                         SCTP_INP_DECR_REF(inp);
12711                         SCTP_INP_WUNLOCK(inp);
12712                 } else {
12713                         hold_tcblock = 1;
12714                 }
12715                 if (error) {
12716                         goto out_unlocked;
12717                 }
12718                 if (t_inp != inp) {
12719                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOTCONN);
12720                         error = ENOTCONN;
12721                         goto out_unlocked;
12722                 }
12723         }
12724         if (stcb == NULL) {
12725                 if (addr == NULL) {
12726                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOENT);
12727                         error = ENOENT;
12728                         goto out_unlocked;
12729                 } else {
12730                         /* We must go ahead and start the INIT process */
12731                         uint32_t vrf_id;
12732
12733                         if ((sinfo_flags & SCTP_ABORT) ||
12734                             ((sinfo_flags & SCTP_EOF) && (sndlen == 0))) {
12735                                 /*-
12736                                  * User asks to abort a non-existant assoc,
12737                                  * or EOF a non-existant assoc with no data
12738                                  */
12739                                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOENT);
12740                                 error = ENOENT;
12741                                 goto out_unlocked;
12742                         }
12743                         /* get an asoc/stcb struct */
12744                         vrf_id = inp->def_vrf_id;
12745 #ifdef INVARIANTS
12746                         if (create_lock_applied == 0) {
12747                                 panic("Error, should hold create lock and I don't?");
12748                         }
12749 #endif
12750                         stcb = sctp_aloc_assoc(inp, addr, &error, 0, vrf_id,
12751                             inp->sctp_ep.pre_open_stream_count,
12752                             inp->sctp_ep.port,
12753                             p);
12754                         if (stcb == NULL) {
12755                                 /* Error is setup for us in the call */
12756                                 goto out_unlocked;
12757                         }
12758                         if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) {
12759                                 stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED;
12760                                 /*
12761                                  * Set the connected flag so we can queue
12762                                  * data
12763                                  */
12764                                 soisconnecting(so);
12765                         }
12766                         hold_tcblock = 1;
12767                         if (create_lock_applied) {
12768                                 SCTP_ASOC_CREATE_UNLOCK(inp);
12769                                 create_lock_applied = 0;
12770                         } else {
12771                                 SCTP_PRINTF("Huh-3? create lock should have been on??\n");
12772                         }
12773                         /*
12774                          * Turn on queue only flag to prevent data from
12775                          * being sent
12776                          */
12777                         queue_only = 1;
12778                         asoc = &stcb->asoc;
12779                         SCTP_SET_STATE(asoc, SCTP_STATE_COOKIE_WAIT);
12780                         (void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered);
12781
12782                         /* initialize authentication params for the assoc */
12783                         sctp_initialize_auth_params(inp, stcb);
12784
12785                         if (control) {
12786                                 if (sctp_process_cmsgs_for_init(stcb, control, &error)) {
12787                                         sctp_free_assoc(inp, stcb, SCTP_PCBFREE_FORCE,
12788                                             SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_5);
12789                                         hold_tcblock = 0;
12790                                         stcb = NULL;
12791                                         goto out_unlocked;
12792                                 }
12793                         }
12794                         /* out with the INIT */
12795                         queue_only_for_init = 1;
12796                         /*-
12797                          * we may want to dig in after this call and adjust the MTU
12798                          * value. It defaulted to 1500 (constant) but the ro
12799                          * structure may now have an update and thus we may need to
12800                          * change it BEFORE we append the message.
12801                          */
12802                 }
12803         } else
12804                 asoc = &stcb->asoc;
12805         if (srcv == NULL)
12806                 srcv = (struct sctp_sndrcvinfo *)&asoc->def_send;
12807         if (srcv->sinfo_flags & SCTP_ADDR_OVER) {
12808                 if (addr)
12809                         net = sctp_findnet(stcb, addr);
12810                 else
12811                         net = NULL;
12812                 if ((net == NULL) ||
12813                     ((port != 0) && (port != stcb->rport))) {
12814                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12815                         error = EINVAL;
12816                         goto out_unlocked;
12817                 }
12818         } else {
12819                 if (stcb->asoc.alternate) {
12820                         net = stcb->asoc.alternate;
12821                 } else {
12822                         net = stcb->asoc.primary_destination;
12823                 }
12824         }
12825         atomic_add_int(&stcb->total_sends, 1);
12826         /* Keep the stcb from being freed under our feet */
12827         atomic_add_int(&asoc->refcnt, 1);
12828         free_cnt_applied = 1;
12829
12830         if (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_NO_FRAGMENT)) {
12831                 if (sndlen > asoc->smallest_mtu) {
12832                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EMSGSIZE);
12833                         error = EMSGSIZE;
12834                         goto out_unlocked;
12835                 }
12836         }
12837         if (SCTP_SO_IS_NBIO(so)
12838             || (flags & MSG_NBIO)
12839             ) {
12840                 non_blocking = 1;
12841         }
12842         /* would we block? */
12843         if (non_blocking) {
12844                 uint32_t amount;
12845
12846                 if (hold_tcblock == 0) {
12847                         SCTP_TCB_LOCK(stcb);
12848                         hold_tcblock = 1;
12849                 }
12850                 inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * SCTP_DATA_CHUNK_OVERHEAD(stcb));
12851                 if (user_marks_eor == 0) {
12852                         amount = sndlen;
12853                 } else {
12854                         amount = 1;
12855                 }
12856                 if ((SCTP_SB_LIMIT_SND(so) < (amount + inqueue_bytes + stcb->asoc.sb_send_resv)) ||
12857                     (stcb->asoc.chunks_on_out_queue >= SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue))) {
12858                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EWOULDBLOCK);
12859                         if (sndlen > SCTP_SB_LIMIT_SND(so))
12860                                 error = EMSGSIZE;
12861                         else
12862                                 error = EWOULDBLOCK;
12863                         goto out_unlocked;
12864                 }
12865                 stcb->asoc.sb_send_resv += sndlen;
12866                 SCTP_TCB_UNLOCK(stcb);
12867                 hold_tcblock = 0;
12868         } else {
12869                 atomic_add_int(&stcb->asoc.sb_send_resv, sndlen);
12870         }
12871         local_soresv = sndlen;
12872         if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
12873                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
12874                 error = ECONNRESET;
12875                 goto out_unlocked;
12876         }
12877         if (create_lock_applied) {
12878                 SCTP_ASOC_CREATE_UNLOCK(inp);
12879                 create_lock_applied = 0;
12880         }
12881         /* Is the stream no. valid? */
12882         if (srcv->sinfo_stream >= asoc->streamoutcnt) {
12883                 /* Invalid stream number */
12884                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12885                 error = EINVAL;
12886                 goto out_unlocked;
12887         }
12888         if ((asoc->strmout[srcv->sinfo_stream].state != SCTP_STREAM_OPEN) &&
12889             (asoc->strmout[srcv->sinfo_stream].state != SCTP_STREAM_OPENING)) {
12890                 /*
12891                  * Can't queue any data while stream reset is underway.
12892                  */
12893                 if (asoc->strmout[srcv->sinfo_stream].state > SCTP_STREAM_OPEN) {
12894                         error = EAGAIN;
12895                 } else {
12896                         error = EINVAL;
12897                 }
12898                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, error);
12899                 goto out_unlocked;
12900         }
12901         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) ||
12902             (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)) {
12903                 queue_only = 1;
12904         }
12905         /* we are now done with all control */
12906         if (control) {
12907                 sctp_m_freem(control);
12908                 control = NULL;
12909         }
12910         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_SENT) ||
12911             (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED) ||
12912             (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) ||
12913             (asoc->state & SCTP_STATE_SHUTDOWN_PENDING)) {
12914                 if (srcv->sinfo_flags & SCTP_ABORT) {
12915                         ;
12916                 } else {
12917                         SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
12918                         error = ECONNRESET;
12919                         goto out_unlocked;
12920                 }
12921         }
12922         /* Ok, we will attempt a msgsnd :> */
12923         if (p) {
12924                 p->td_ru.ru_msgsnd++;
12925         }
12926         /* Are we aborting? */
12927         if (srcv->sinfo_flags & SCTP_ABORT) {
12928                 struct mbuf *mm;
12929                 int tot_demand, tot_out = 0, max_out;
12930
12931                 SCTP_STAT_INCR(sctps_sends_with_abort);
12932                 if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) ||
12933                     (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)) {
12934                         /* It has to be up before we abort */
12935                         /* how big is the user initiated abort? */
12936                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12937                         error = EINVAL;
12938                         goto out;
12939                 }
12940                 if (hold_tcblock) {
12941                         SCTP_TCB_UNLOCK(stcb);
12942                         hold_tcblock = 0;
12943                 }
12944                 if (top) {
12945                         struct mbuf *cntm = NULL;
12946
12947                         mm = sctp_get_mbuf_for_msg(sizeof(struct sctp_paramhdr), 0, M_WAITOK, 1, MT_DATA);
12948                         if (sndlen != 0) {
12949                                 for (cntm = top; cntm; cntm = SCTP_BUF_NEXT(cntm)) {
12950                                         tot_out += SCTP_BUF_LEN(cntm);
12951                                 }
12952                         }
12953                 } else {
12954                         /* Must fit in a MTU */
12955                         tot_out = sndlen;
12956                         tot_demand = (tot_out + sizeof(struct sctp_paramhdr));
12957                         if (tot_demand > SCTP_DEFAULT_ADD_MORE) {
12958                                 /* To big */
12959                                 SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EMSGSIZE);
12960                                 error = EMSGSIZE;
12961                                 goto out;
12962                         }
12963                         mm = sctp_get_mbuf_for_msg(tot_demand, 0, M_WAITOK, 1, MT_DATA);
12964                 }
12965                 if (mm == NULL) {
12966                         SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12967                         error = ENOMEM;
12968                         goto out;
12969                 }
12970                 max_out = asoc->smallest_mtu - sizeof(struct sctp_paramhdr);
12971                 max_out -= sizeof(struct sctp_abort_msg);
12972                 if (tot_out > max_out) {
12973                         tot_out = max_out;
12974                 }
12975                 if (mm) {
12976                         struct sctp_paramhdr *ph;
12977
12978                         /* now move forward the data pointer */
12979                         ph = mtod(mm, struct sctp_paramhdr *);
12980                         ph->param_type = htons(SCTP_CAUSE_USER_INITIATED_ABT);
12981                         ph->param_length = htons((uint16_t)(sizeof(struct sctp_paramhdr) + tot_out));
12982                         ph++;
12983                         SCTP_BUF_LEN(mm) = tot_out + sizeof(struct sctp_paramhdr);
12984                         if (top == NULL) {
12985                                 error = uiomove((caddr_t)ph, (int)tot_out, uio);
12986                                 if (error) {
12987                                         /*-
12988                                          * Here if we can't get his data we
12989                                          * still abort we just don't get to
12990                                          * send the users note :-0
12991                                          */
12992                                         sctp_m_freem(mm);
12993                                         mm = NULL;
12994                                 }
12995                         } else {
12996                                 if (sndlen != 0) {
12997                                         SCTP_BUF_NEXT(mm) = top;
12998                                 }
12999                         }
13000                 }
13001                 if (hold_tcblock == 0) {
13002                         SCTP_TCB_LOCK(stcb);
13003                 }
13004                 atomic_add_int(&stcb->asoc.refcnt, -1);
13005                 free_cnt_applied = 0;
13006                 /* release this lock, otherwise we hang on ourselves */
13007                 sctp_abort_an_association(stcb->sctp_ep, stcb, mm, SCTP_SO_LOCKED);
13008                 /* now relock the stcb so everything is sane */
13009                 hold_tcblock = 0;
13010                 stcb = NULL;
13011                 /*
13012                  * In this case top is already chained to mm avoid double
13013                  * free, since we free it below if top != NULL and driver
13014                  * would free it after sending the packet out
13015                  */
13016                 if (sndlen != 0) {
13017                         top = NULL;
13018                 }
13019                 goto out_unlocked;
13020         }
13021         /* Calculate the maximum we can send */
13022         inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * SCTP_DATA_CHUNK_OVERHEAD(stcb));
13023         if (SCTP_SB_LIMIT_SND(so) > inqueue_bytes) {
13024                 if (non_blocking) {
13025                         /* we already checked for non-blocking above. */
13026                         max_len = sndlen;
13027                 } else {
13028                         max_len = SCTP_SB_LIMIT_SND(so) - inqueue_bytes;
13029                 }
13030         } else {
13031                 max_len = 0;
13032         }
13033         if (hold_tcblock) {
13034                 SCTP_TCB_UNLOCK(stcb);
13035                 hold_tcblock = 0;
13036         }
13037         if (asoc->strmout == NULL) {
13038                 /* huh? software error */
13039                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EFAULT);
13040                 error = EFAULT;
13041                 goto out_unlocked;
13042         }
13043
13044         /* Unless E_EOR mode is on, we must make a send FIT in one call. */
13045         if ((user_marks_eor == 0) &&
13046             (sndlen > SCTP_SB_LIMIT_SND(stcb->sctp_socket))) {
13047                 /* It will NEVER fit */
13048                 SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EMSGSIZE);
13049                 error = EMSGSIZE;
13050                 goto out_unlocked;
13051         }
13052         if ((uio == NULL) && user_marks_eor) {
13053                 /*-
13054                  * We do not support eeor mode for
13055                  * sending with mbuf chains (like sendfile).
13056                  */
13057                 SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
13058                 error = EINVAL;
13059                 goto out_unlocked;
13060         }
13061
13062         if (user_marks_eor) {
13063                 local_add_more = min(SCTP_SB_LIMIT_SND(so), SCTP_BASE_SYSCTL(sctp_add_more_threshold));
13064         } else {
13065                 /*-
13066                  * For non-eeor the whole message must fit in
13067                  * the socket send buffer.
13068                  */
13069                 local_add_more = sndlen;
13070         }
13071         len = 0;
13072         if (non_blocking) {
13073                 goto skip_preblock;
13074         }
13075         if (((max_len <= local_add_more) &&
13076             (SCTP_SB_LIMIT_SND(so) >= local_add_more)) ||
13077             (max_len == 0) ||
13078             ((stcb->asoc.chunks_on_out_queue + stcb->asoc.stream_queue_cnt) >= SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue))) {
13079                 /* No room right now ! */
13080                 SOCKBUF_LOCK(&so->so_snd);
13081                 inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * SCTP_DATA_CHUNK_OVERHEAD(stcb));
13082                 while ((SCTP_SB_LIMIT_SND(so) < (inqueue_bytes + local_add_more)) ||
13083                     ((stcb->asoc.stream_queue_cnt + stcb->asoc.chunks_on_out_queue) >= SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue))) {
13084                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "pre_block limit:%u <(inq:%d + %d) || (%d+%d > %d)\n",
13085                             (unsigned int)SCTP_SB_LIMIT_SND(so),
13086                             inqueue_bytes,
13087                             local_add_more,
13088                             stcb->asoc.stream_queue_cnt,
13089                             stcb->asoc.chunks_on_out_queue,
13090                             SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue));
13091                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13092                                 sctp_log_block(SCTP_BLOCK_LOG_INTO_BLKA, asoc, sndlen);
13093                         }
13094                         be.error = 0;
13095                         stcb->block_entry = &be;
13096                         error = sbwait(&so->so_snd);
13097                         stcb->block_entry = NULL;
13098                         if (error || so->so_error || be.error) {
13099                                 if (error == 0) {
13100                                         if (so->so_error)
13101                                                 error = so->so_error;
13102                                         if (be.error) {
13103                                                 error = be.error;
13104                                         }
13105                                 }
13106                                 SOCKBUF_UNLOCK(&so->so_snd);
13107                                 goto out_unlocked;
13108                         }
13109                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13110                                 sctp_log_block(SCTP_BLOCK_LOG_OUTOF_BLK,
13111                                     asoc, stcb->asoc.total_output_queue_size);
13112                         }
13113                         if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
13114                                 SOCKBUF_UNLOCK(&so->so_snd);
13115                                 goto out_unlocked;
13116                         }
13117                         inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * SCTP_DATA_CHUNK_OVERHEAD(stcb));
13118                 }
13119                 if (SCTP_SB_LIMIT_SND(so) > inqueue_bytes) {
13120                         max_len = SCTP_SB_LIMIT_SND(so) - inqueue_bytes;
13121                 } else {
13122                         max_len = 0;
13123                 }
13124                 SOCKBUF_UNLOCK(&so->so_snd);
13125         }
13126
13127 skip_preblock:
13128         if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
13129                 goto out_unlocked;
13130         }
13131         /*
13132          * sndlen covers for mbuf case uio_resid covers for the non-mbuf
13133          * case NOTE: uio will be null when top/mbuf is passed
13134          */
13135         if (sndlen == 0) {
13136                 if (srcv->sinfo_flags & SCTP_EOF) {
13137                         got_all_of_the_send = 1;
13138                         goto dataless_eof;
13139                 } else {
13140                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
13141                         error = EINVAL;
13142                         goto out;
13143                 }
13144         }
13145         if (top == NULL) {
13146                 struct sctp_stream_queue_pending *sp;
13147                 struct sctp_stream_out *strm;
13148                 uint32_t sndout;
13149
13150                 SCTP_TCB_SEND_LOCK(stcb);
13151                 if ((asoc->stream_locked) &&
13152                     (asoc->stream_locked_on != srcv->sinfo_stream)) {
13153                         SCTP_TCB_SEND_UNLOCK(stcb);
13154                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
13155                         error = EINVAL;
13156                         goto out;
13157                 }
13158                 SCTP_TCB_SEND_UNLOCK(stcb);
13159
13160                 strm = &stcb->asoc.strmout[srcv->sinfo_stream];
13161                 if (strm->last_msg_incomplete == 0) {
13162         do_a_copy_in:
13163                         sp = sctp_copy_it_in(stcb, asoc, srcv, uio, net, max_len, user_marks_eor, &error);
13164                         if (error) {
13165                                 goto out;
13166                         }
13167                         SCTP_TCB_SEND_LOCK(stcb);
13168                         if (sp->msg_is_complete) {
13169                                 strm->last_msg_incomplete = 0;
13170                                 asoc->stream_locked = 0;
13171                         } else {
13172                                 /*
13173                                  * Just got locked to this guy in case of an
13174                                  * interrupt.
13175                                  */
13176                                 strm->last_msg_incomplete = 1;
13177                                 if (stcb->asoc.idata_supported == 0) {
13178                                         asoc->stream_locked = 1;
13179                                         asoc->stream_locked_on = srcv->sinfo_stream;
13180                                 }
13181                                 sp->sender_all_done = 0;
13182                         }
13183                         sctp_snd_sb_alloc(stcb, sp->length);
13184                         atomic_add_int(&asoc->stream_queue_cnt, 1);
13185                         if (srcv->sinfo_flags & SCTP_UNORDERED) {
13186                                 SCTP_STAT_INCR(sctps_sends_with_unord);
13187                         }
13188                         TAILQ_INSERT_TAIL(&strm->outqueue, sp, next);
13189                         stcb->asoc.ss_functions.sctp_ss_add_to_stream(stcb, asoc, strm, sp, 1);
13190                         SCTP_TCB_SEND_UNLOCK(stcb);
13191                 } else {
13192                         SCTP_TCB_SEND_LOCK(stcb);
13193                         sp = TAILQ_LAST(&strm->outqueue, sctp_streamhead);
13194                         SCTP_TCB_SEND_UNLOCK(stcb);
13195                         if (sp == NULL) {
13196                                 /* ???? Huh ??? last msg is gone */
13197 #ifdef INVARIANTS
13198                                 panic("Warning: Last msg marked incomplete, yet nothing left?");
13199 #else
13200                                 SCTP_PRINTF("Warning: Last msg marked incomplete, yet nothing left?\n");
13201                                 strm->last_msg_incomplete = 0;
13202 #endif
13203                                 goto do_a_copy_in;
13204
13205                         }
13206                 }
13207                 while (uio->uio_resid > 0) {
13208                         /* How much room do we have? */
13209                         struct mbuf *new_tail, *mm;
13210
13211                         inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * SCTP_DATA_CHUNK_OVERHEAD(stcb));
13212                         if (SCTP_SB_LIMIT_SND(so) > inqueue_bytes)
13213                                 max_len = SCTP_SB_LIMIT_SND(so) - inqueue_bytes;
13214                         else
13215                                 max_len = 0;
13216
13217                         if ((max_len > SCTP_BASE_SYSCTL(sctp_add_more_threshold)) ||
13218                             (max_len && (SCTP_SB_LIMIT_SND(so) < SCTP_BASE_SYSCTL(sctp_add_more_threshold))) ||
13219                             (uio->uio_resid && (uio->uio_resid <= (int)max_len))) {
13220                                 sndout = 0;
13221                                 new_tail = NULL;
13222                                 if (hold_tcblock) {
13223                                         SCTP_TCB_UNLOCK(stcb);
13224                                         hold_tcblock = 0;
13225                                 }
13226                                 mm = sctp_copy_resume(uio, max_len, user_marks_eor, &error, &sndout, &new_tail);
13227                                 if ((mm == NULL) || error) {
13228                                         if (mm) {
13229                                                 sctp_m_freem(mm);
13230                                         }
13231                                         goto out;
13232                                 }
13233                                 /* Update the mbuf and count */
13234                                 SCTP_TCB_SEND_LOCK(stcb);
13235                                 if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
13236                                         /*
13237                                          * we need to get out. Peer probably
13238                                          * aborted.
13239                                          */
13240                                         sctp_m_freem(mm);
13241                                         if (stcb->asoc.state & SCTP_PCB_FLAGS_WAS_ABORTED) {
13242                                                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
13243                                                 error = ECONNRESET;
13244                                         }
13245                                         SCTP_TCB_SEND_UNLOCK(stcb);
13246                                         goto out;
13247                                 }
13248                                 if (sp->tail_mbuf) {
13249                                         /* tack it to the end */
13250                                         SCTP_BUF_NEXT(sp->tail_mbuf) = mm;
13251                                         sp->tail_mbuf = new_tail;
13252                                 } else {
13253                                         /* A stolen mbuf */
13254                                         sp->data = mm;
13255                                         sp->tail_mbuf = new_tail;
13256                                 }
13257                                 sctp_snd_sb_alloc(stcb, sndout);
13258                                 atomic_add_int(&sp->length, sndout);
13259                                 len += sndout;
13260                                 if (srcv->sinfo_flags & SCTP_SACK_IMMEDIATELY) {
13261                                         sp->sinfo_flags |= SCTP_SACK_IMMEDIATELY;
13262                                 }
13263
13264                                 /* Did we reach EOR? */
13265                                 if ((uio->uio_resid == 0) &&
13266                                     ((user_marks_eor == 0) ||
13267                                     (srcv->sinfo_flags & SCTP_EOF) ||
13268                                     (user_marks_eor && (srcv->sinfo_flags & SCTP_EOR)))) {
13269                                         sp->msg_is_complete = 1;
13270                                 } else {
13271                                         sp->msg_is_complete = 0;
13272                                 }
13273                                 SCTP_TCB_SEND_UNLOCK(stcb);
13274                         }
13275                         if (uio->uio_resid == 0) {
13276                                 /* got it all? */
13277                                 continue;
13278                         }
13279                         /* PR-SCTP? */
13280                         if ((asoc->prsctp_supported) && (asoc->sent_queue_cnt_removeable > 0)) {
13281                                 /*
13282                                  * This is ugly but we must assure locking
13283                                  * order
13284                                  */
13285                                 if (hold_tcblock == 0) {
13286                                         SCTP_TCB_LOCK(stcb);
13287                                         hold_tcblock = 1;
13288                                 }
13289                                 sctp_prune_prsctp(stcb, asoc, srcv, sndlen);
13290                                 inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * SCTP_DATA_CHUNK_OVERHEAD(stcb));
13291                                 if (SCTP_SB_LIMIT_SND(so) > inqueue_bytes)
13292                                         max_len = SCTP_SB_LIMIT_SND(so) - inqueue_bytes;
13293                                 else
13294                                         max_len = 0;
13295                                 if (max_len > 0) {
13296                                         continue;
13297                                 }
13298                                 SCTP_TCB_UNLOCK(stcb);
13299                                 hold_tcblock = 0;
13300                         }
13301                         /* wait for space now */
13302                         if (non_blocking) {
13303                                 /* Non-blocking io in place out */
13304                                 goto skip_out_eof;
13305                         }
13306                         /* What about the INIT, send it maybe */
13307                         if (queue_only_for_init) {
13308                                 if (hold_tcblock == 0) {
13309                                         SCTP_TCB_LOCK(stcb);
13310                                         hold_tcblock = 1;
13311                                 }
13312                                 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_OPEN) {
13313                                         /* a collision took us forward? */
13314                                         queue_only = 0;
13315                                 } else {
13316                                         sctp_send_initiate(inp, stcb, SCTP_SO_LOCKED);
13317                                         SCTP_SET_STATE(asoc, SCTP_STATE_COOKIE_WAIT);
13318                                         queue_only = 1;
13319                                 }
13320                         }
13321                         if ((net->flight_size > net->cwnd) &&
13322                             (asoc->sctp_cmt_on_off == 0)) {
13323                                 SCTP_STAT_INCR(sctps_send_cwnd_avoid);
13324                                 queue_only = 1;
13325                         } else if (asoc->ifp_had_enobuf) {
13326                                 SCTP_STAT_INCR(sctps_ifnomemqueued);
13327                                 if (net->flight_size > (2 * net->mtu)) {
13328                                         queue_only = 1;
13329                                 }
13330                                 asoc->ifp_had_enobuf = 0;
13331                         }
13332                         un_sent = stcb->asoc.total_output_queue_size - stcb->asoc.total_flight;
13333                         if ((sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY)) &&
13334                             (stcb->asoc.total_flight > 0) &&
13335                             (stcb->asoc.stream_queue_cnt < SCTP_MAX_DATA_BUNDLING) &&
13336                             (un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD))) {
13337
13338                                 /*-
13339                                  * Ok, Nagle is set on and we have data outstanding.
13340                                  * Don't send anything and let SACKs drive out the
13341                                  * data unless we have a "full" segment to send.
13342                                  */
13343                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
13344                                         sctp_log_nagle_event(stcb, SCTP_NAGLE_APPLIED);
13345                                 }
13346                                 SCTP_STAT_INCR(sctps_naglequeued);
13347                                 nagle_applies = 1;
13348                         } else {
13349                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
13350                                         if (sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY))
13351                                                 sctp_log_nagle_event(stcb, SCTP_NAGLE_SKIPPED);
13352                                 }
13353                                 SCTP_STAT_INCR(sctps_naglesent);
13354                                 nagle_applies = 0;
13355                         }
13356                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13357
13358                                 sctp_misc_ints(SCTP_CWNDLOG_PRESEND, queue_only_for_init, queue_only,
13359                                     nagle_applies, un_sent);
13360                                 sctp_misc_ints(SCTP_CWNDLOG_PRESEND, stcb->asoc.total_output_queue_size,
13361                                     stcb->asoc.total_flight,
13362                                     stcb->asoc.chunks_on_out_queue, stcb->asoc.total_flight_count);
13363                         }
13364                         if (queue_only_for_init)
13365                                 queue_only_for_init = 0;
13366                         if ((queue_only == 0) && (nagle_applies == 0)) {
13367                                 /*-
13368                                  * need to start chunk output
13369                                  * before blocking.. note that if
13370                                  * a lock is already applied, then
13371                                  * the input via the net is happening
13372                                  * and I don't need to start output :-D
13373                                  */
13374                                 if (hold_tcblock == 0) {
13375                                         if (SCTP_TCB_TRYLOCK(stcb)) {
13376                                                 hold_tcblock = 1;
13377                                                 sctp_chunk_output(inp,
13378                                                     stcb,
13379                                                     SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13380                                         }
13381                                 } else {
13382                                         sctp_chunk_output(inp,
13383                                             stcb,
13384                                             SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13385                                 }
13386                                 if (hold_tcblock == 1) {
13387                                         SCTP_TCB_UNLOCK(stcb);
13388                                         hold_tcblock = 0;
13389                                 }
13390                         }
13391                         SOCKBUF_LOCK(&so->so_snd);
13392                         /*-
13393                          * This is a bit strange, but I think it will
13394                          * work. The total_output_queue_size is locked and
13395                          * protected by the TCB_LOCK, which we just released.
13396                          * There is a race that can occur between releasing it
13397                          * above, and me getting the socket lock, where sacks
13398                          * come in but we have not put the SB_WAIT on the
13399                          * so_snd buffer to get the wakeup. After the LOCK
13400                          * is applied the sack_processing will also need to
13401                          * LOCK the so->so_snd to do the actual sowwakeup(). So
13402                          * once we have the socket buffer lock if we recheck the
13403                          * size we KNOW we will get to sleep safely with the
13404                          * wakeup flag in place.
13405                          */
13406                         inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * SCTP_DATA_CHUNK_OVERHEAD(stcb));
13407                         if (SCTP_SB_LIMIT_SND(so) <= (inqueue_bytes +
13408                             min(SCTP_BASE_SYSCTL(sctp_add_more_threshold), SCTP_SB_LIMIT_SND(so)))) {
13409                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13410                                         sctp_log_block(SCTP_BLOCK_LOG_INTO_BLK,
13411                                             asoc, (size_t)uio->uio_resid);
13412                                 }
13413                                 be.error = 0;
13414                                 stcb->block_entry = &be;
13415                                 error = sbwait(&so->so_snd);
13416                                 stcb->block_entry = NULL;
13417
13418                                 if (error || so->so_error || be.error) {
13419                                         if (error == 0) {
13420                                                 if (so->so_error)
13421                                                         error = so->so_error;
13422                                                 if (be.error) {
13423                                                         error = be.error;
13424                                                 }
13425                                         }
13426                                         SOCKBUF_UNLOCK(&so->so_snd);
13427                                         goto out_unlocked;
13428                                 }
13429
13430                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13431                                         sctp_log_block(SCTP_BLOCK_LOG_OUTOF_BLK,
13432                                             asoc, stcb->asoc.total_output_queue_size);
13433                                 }
13434                         }
13435                         SOCKBUF_UNLOCK(&so->so_snd);
13436                         if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
13437                                 goto out_unlocked;
13438                         }
13439                 }
13440                 SCTP_TCB_SEND_LOCK(stcb);
13441                 if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
13442                         SCTP_TCB_SEND_UNLOCK(stcb);
13443                         goto out_unlocked;
13444                 }
13445                 if (sp) {
13446                         if (sp->msg_is_complete == 0) {
13447                                 strm->last_msg_incomplete = 1;
13448                                 if (stcb->asoc.idata_supported == 0) {
13449                                         asoc->stream_locked = 1;
13450                                         asoc->stream_locked_on = srcv->sinfo_stream;
13451                                 }
13452                         } else {
13453                                 sp->sender_all_done = 1;
13454                                 strm->last_msg_incomplete = 0;
13455                                 asoc->stream_locked = 0;
13456                         }
13457                 } else {
13458                         SCTP_PRINTF("Huh no sp TSNH?\n");
13459                         strm->last_msg_incomplete = 0;
13460                         asoc->stream_locked = 0;
13461                 }
13462                 SCTP_TCB_SEND_UNLOCK(stcb);
13463                 if (uio->uio_resid == 0) {
13464                         got_all_of_the_send = 1;
13465                 }
13466         } else {
13467                 /* We send in a 0, since we do NOT have any locks */
13468                 error = sctp_msg_append(stcb, net, top, srcv, 0);
13469                 top = NULL;
13470                 if (srcv->sinfo_flags & SCTP_EOF) {
13471                         /*
13472                          * This should only happen for Panda for the mbuf
13473                          * send case, which does NOT yet support EEOR mode.
13474                          * Thus, we can just set this flag to do the proper
13475                          * EOF handling.
13476                          */
13477                         got_all_of_the_send = 1;
13478                 }
13479         }
13480         if (error) {
13481                 goto out;
13482         }
13483 dataless_eof:
13484         /* EOF thing ? */
13485         if ((srcv->sinfo_flags & SCTP_EOF) &&
13486             (got_all_of_the_send == 1)) {
13487                 SCTP_STAT_INCR(sctps_sends_with_eof);
13488                 error = 0;
13489                 if (hold_tcblock == 0) {
13490                         SCTP_TCB_LOCK(stcb);
13491                         hold_tcblock = 1;
13492                 }
13493                 if (TAILQ_EMPTY(&asoc->send_queue) &&
13494                     TAILQ_EMPTY(&asoc->sent_queue) &&
13495                     sctp_is_there_unsent_data(stcb, SCTP_SO_LOCKED) == 0) {
13496                         if ((*asoc->ss_functions.sctp_ss_is_user_msgs_incomplete) (stcb, asoc)) {
13497                                 goto abort_anyway;
13498                         }
13499                         /* there is nothing queued to send, so I'm done... */
13500                         if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) &&
13501                             (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
13502                             (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
13503                                 struct sctp_nets *netp;
13504
13505                                 /* only send SHUTDOWN the first time through */
13506                                 if (SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) {
13507                                         SCTP_STAT_DECR_GAUGE32(sctps_currestab);
13508                                 }
13509                                 SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_SENT);
13510                                 SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING);
13511                                 sctp_stop_timers_for_shutdown(stcb);
13512                                 if (stcb->asoc.alternate) {
13513                                         netp = stcb->asoc.alternate;
13514                                 } else {
13515                                         netp = stcb->asoc.primary_destination;
13516                                 }
13517                                 sctp_send_shutdown(stcb, netp);
13518                                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb,
13519                                     netp);
13520                                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
13521                                     asoc->primary_destination);
13522                         }
13523                 } else {
13524                         /*-
13525                          * we still got (or just got) data to send, so set
13526                          * SHUTDOWN_PENDING
13527                          */
13528                         /*-
13529                          * XXX sockets draft says that SCTP_EOF should be
13530                          * sent with no data.  currently, we will allow user
13531                          * data to be sent first and move to
13532                          * SHUTDOWN-PENDING
13533                          */
13534                         if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) &&
13535                             (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
13536                             (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
13537                                 if (hold_tcblock == 0) {
13538                                         SCTP_TCB_LOCK(stcb);
13539                                         hold_tcblock = 1;
13540                                 }
13541                                 if ((*asoc->ss_functions.sctp_ss_is_user_msgs_incomplete) (stcb, asoc)) {
13542                                         asoc->state |= SCTP_STATE_PARTIAL_MSG_LEFT;
13543                                 }
13544                                 asoc->state |= SCTP_STATE_SHUTDOWN_PENDING;
13545                                 if (TAILQ_EMPTY(&asoc->send_queue) &&
13546                                     TAILQ_EMPTY(&asoc->sent_queue) &&
13547                                     (asoc->state & SCTP_STATE_PARTIAL_MSG_LEFT)) {
13548                                         struct mbuf *op_err;
13549                                         char msg[SCTP_DIAG_INFO_LEN];
13550
13551                         abort_anyway:
13552                                         if (free_cnt_applied) {
13553                                                 atomic_add_int(&stcb->asoc.refcnt, -1);
13554                                                 free_cnt_applied = 0;
13555                                         }
13556                                         snprintf(msg, sizeof(msg),
13557                                             "%s:%d at %s", __FILE__, __LINE__, __func__);
13558                                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
13559                                             msg);
13560                                         sctp_abort_an_association(stcb->sctp_ep, stcb,
13561                                             op_err, SCTP_SO_LOCKED);
13562                                         /*
13563                                          * now relock the stcb so everything
13564                                          * is sane
13565                                          */
13566                                         hold_tcblock = 0;
13567                                         stcb = NULL;
13568                                         goto out;
13569                                 }
13570                                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
13571                                     asoc->primary_destination);
13572                                 sctp_feature_off(inp, SCTP_PCB_FLAGS_NODELAY);
13573                         }
13574                 }
13575         }
13576 skip_out_eof:
13577         if (!TAILQ_EMPTY(&stcb->asoc.control_send_queue)) {
13578                 some_on_control = 1;
13579         }
13580         if (queue_only_for_init) {
13581                 if (hold_tcblock == 0) {
13582                         SCTP_TCB_LOCK(stcb);
13583                         hold_tcblock = 1;
13584                 }
13585                 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_OPEN) {
13586                         /* a collision took us forward? */
13587                         queue_only = 0;
13588                 } else {
13589                         sctp_send_initiate(inp, stcb, SCTP_SO_LOCKED);
13590                         SCTP_SET_STATE(&stcb->asoc, SCTP_STATE_COOKIE_WAIT);
13591                         queue_only = 1;
13592                 }
13593         }
13594         if ((net->flight_size > net->cwnd) &&
13595             (stcb->asoc.sctp_cmt_on_off == 0)) {
13596                 SCTP_STAT_INCR(sctps_send_cwnd_avoid);
13597                 queue_only = 1;
13598         } else if (asoc->ifp_had_enobuf) {
13599                 SCTP_STAT_INCR(sctps_ifnomemqueued);
13600                 if (net->flight_size > (2 * net->mtu)) {
13601                         queue_only = 1;
13602                 }
13603                 asoc->ifp_had_enobuf = 0;
13604         }
13605         un_sent = stcb->asoc.total_output_queue_size - stcb->asoc.total_flight;
13606         if ((sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY)) &&
13607             (stcb->asoc.total_flight > 0) &&
13608             (stcb->asoc.stream_queue_cnt < SCTP_MAX_DATA_BUNDLING) &&
13609             (un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD))) {
13610                 /*-
13611                  * Ok, Nagle is set on and we have data outstanding.
13612                  * Don't send anything and let SACKs drive out the
13613                  * data unless wen have a "full" segment to send.
13614                  */
13615                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
13616                         sctp_log_nagle_event(stcb, SCTP_NAGLE_APPLIED);
13617                 }
13618                 SCTP_STAT_INCR(sctps_naglequeued);
13619                 nagle_applies = 1;
13620         } else {
13621                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
13622                         if (sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY))
13623                                 sctp_log_nagle_event(stcb, SCTP_NAGLE_SKIPPED);
13624                 }
13625                 SCTP_STAT_INCR(sctps_naglesent);
13626                 nagle_applies = 0;
13627         }
13628         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13629                 sctp_misc_ints(SCTP_CWNDLOG_PRESEND, queue_only_for_init, queue_only,
13630                     nagle_applies, un_sent);
13631                 sctp_misc_ints(SCTP_CWNDLOG_PRESEND, stcb->asoc.total_output_queue_size,
13632                     stcb->asoc.total_flight,
13633                     stcb->asoc.chunks_on_out_queue, stcb->asoc.total_flight_count);
13634         }
13635         if ((queue_only == 0) && (nagle_applies == 0) && (stcb->asoc.peers_rwnd && un_sent)) {
13636                 /* we can attempt to send too. */
13637                 if (hold_tcblock == 0) {
13638                         /*
13639                          * If there is activity recv'ing sacks no need to
13640                          * send
13641                          */
13642                         if (SCTP_TCB_TRYLOCK(stcb)) {
13643                                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13644                                 hold_tcblock = 1;
13645                         }
13646                 } else {
13647                         sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13648                 }
13649         } else if ((queue_only == 0) &&
13650                     (stcb->asoc.peers_rwnd == 0) &&
13651             (stcb->asoc.total_flight == 0)) {
13652                 /* We get to have a probe outstanding */
13653                 if (hold_tcblock == 0) {
13654                         hold_tcblock = 1;
13655                         SCTP_TCB_LOCK(stcb);
13656                 }
13657                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13658         } else if (some_on_control) {
13659                 int num_out, reason, frag_point;
13660
13661                 /* Here we do control only */
13662                 if (hold_tcblock == 0) {
13663                         hold_tcblock = 1;
13664                         SCTP_TCB_LOCK(stcb);
13665                 }
13666                 frag_point = sctp_get_frag_point(stcb, &stcb->asoc);
13667                 (void)sctp_med_chunk_output(inp, stcb, &stcb->asoc, &num_out,
13668                     &reason, 1, 1, &now, &now_filled, frag_point, SCTP_SO_LOCKED);
13669         }
13670         SCTPDBG(SCTP_DEBUG_OUTPUT1, "USR Send complete qo:%d prw:%d unsent:%d tf:%d cooq:%d toqs:%d err:%d\n",
13671             queue_only, stcb->asoc.peers_rwnd, un_sent,
13672             stcb->asoc.total_flight, stcb->asoc.chunks_on_out_queue,
13673             stcb->asoc.total_output_queue_size, error);
13674
13675 out:
13676 out_unlocked:
13677
13678         if (local_soresv && stcb) {
13679                 atomic_subtract_int(&stcb->asoc.sb_send_resv, sndlen);
13680         }
13681         if (create_lock_applied) {
13682                 SCTP_ASOC_CREATE_UNLOCK(inp);
13683         }
13684         if ((stcb) && hold_tcblock) {
13685                 SCTP_TCB_UNLOCK(stcb);
13686         }
13687         if (stcb && free_cnt_applied) {
13688                 atomic_add_int(&stcb->asoc.refcnt, -1);
13689         }
13690 #ifdef INVARIANTS
13691         if (stcb) {
13692                 if (mtx_owned(&stcb->tcb_mtx)) {
13693                         panic("Leaving with tcb mtx owned?");
13694                 }
13695                 if (mtx_owned(&stcb->tcb_send_mtx)) {
13696                         panic("Leaving with tcb send mtx owned?");
13697                 }
13698         }
13699 #endif
13700         if (top) {
13701                 sctp_m_freem(top);
13702         }
13703         if (control) {
13704                 sctp_m_freem(control);
13705         }
13706         return (error);
13707 }
13708
13709
13710 /*
13711  * generate an AUTHentication chunk, if required
13712  */
13713 struct mbuf *
13714 sctp_add_auth_chunk(struct mbuf *m, struct mbuf **m_end,
13715     struct sctp_auth_chunk **auth_ret, uint32_t *offset,
13716     struct sctp_tcb *stcb, uint8_t chunk)
13717 {
13718         struct mbuf *m_auth;
13719         struct sctp_auth_chunk *auth;
13720         int chunk_len;
13721         struct mbuf *cn;
13722
13723         if ((m_end == NULL) || (auth_ret == NULL) || (offset == NULL) ||
13724             (stcb == NULL))
13725                 return (m);
13726
13727         if (stcb->asoc.auth_supported == 0) {
13728                 return (m);
13729         }
13730         /* does the requested chunk require auth? */
13731         if (!sctp_auth_is_required_chunk(chunk, stcb->asoc.peer_auth_chunks)) {
13732                 return (m);
13733         }
13734         m_auth = sctp_get_mbuf_for_msg(sizeof(*auth), 0, M_NOWAIT, 1, MT_HEADER);
13735         if (m_auth == NULL) {
13736                 /* no mbuf's */
13737                 return (m);
13738         }
13739         /* reserve some space if this will be the first mbuf */
13740         if (m == NULL)
13741                 SCTP_BUF_RESV_UF(m_auth, SCTP_MIN_OVERHEAD);
13742         /* fill in the AUTH chunk details */
13743         auth = mtod(m_auth, struct sctp_auth_chunk *);
13744         memset(auth, 0, sizeof(*auth));
13745         auth->ch.chunk_type = SCTP_AUTHENTICATION;
13746         auth->ch.chunk_flags = 0;
13747         chunk_len = sizeof(*auth) +
13748             sctp_get_hmac_digest_len(stcb->asoc.peer_hmac_id);
13749         auth->ch.chunk_length = htons(chunk_len);
13750         auth->hmac_id = htons(stcb->asoc.peer_hmac_id);
13751         /* key id and hmac digest will be computed and filled in upon send */
13752
13753         /* save the offset where the auth was inserted into the chain */
13754         *offset = 0;
13755         for (cn = m; cn; cn = SCTP_BUF_NEXT(cn)) {
13756                 *offset += SCTP_BUF_LEN(cn);
13757         }
13758
13759         /* update length and return pointer to the auth chunk */
13760         SCTP_BUF_LEN(m_auth) = chunk_len;
13761         m = sctp_copy_mbufchain(m_auth, m, m_end, 1, chunk_len, 0);
13762         if (auth_ret != NULL)
13763                 *auth_ret = auth;
13764
13765         return (m);
13766 }
13767
13768 #ifdef INET6
13769 int
13770 sctp_v6src_match_nexthop(struct sockaddr_in6 *src6, sctp_route_t *ro)
13771 {
13772         struct nd_prefix *pfx = NULL;
13773         struct nd_pfxrouter *pfxrtr = NULL;
13774         struct sockaddr_in6 gw6;
13775
13776         if (ro == NULL || ro->ro_rt == NULL || src6->sin6_family != AF_INET6)
13777                 return (0);
13778
13779         /* get prefix entry of address */
13780         ND6_RLOCK();
13781         LIST_FOREACH(pfx, &MODULE_GLOBAL(nd_prefix), ndpr_entry) {
13782                 if (pfx->ndpr_stateflags & NDPRF_DETACHED)
13783                         continue;
13784                 if (IN6_ARE_MASKED_ADDR_EQUAL(&pfx->ndpr_prefix.sin6_addr,
13785                     &src6->sin6_addr, &pfx->ndpr_mask))
13786                         break;
13787         }
13788         /* no prefix entry in the prefix list */
13789         if (pfx == NULL) {
13790                 ND6_RUNLOCK();
13791                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "No prefix entry for ");
13792                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)src6);
13793                 return (0);
13794         }
13795
13796         SCTPDBG(SCTP_DEBUG_OUTPUT2, "v6src_match_nexthop(), Prefix entry is ");
13797         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)src6);
13798
13799         /* search installed gateway from prefix entry */
13800         LIST_FOREACH(pfxrtr, &pfx->ndpr_advrtrs, pfr_entry) {
13801                 memset(&gw6, 0, sizeof(struct sockaddr_in6));
13802                 gw6.sin6_family = AF_INET6;
13803                 gw6.sin6_len = sizeof(struct sockaddr_in6);
13804                 memcpy(&gw6.sin6_addr, &pfxrtr->router->rtaddr,
13805                     sizeof(struct in6_addr));
13806                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "prefix router is ");
13807                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)&gw6);
13808                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "installed router is ");
13809                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, ro->ro_rt->rt_gateway);
13810                 if (sctp_cmpaddr((struct sockaddr *)&gw6, ro->ro_rt->rt_gateway)) {
13811                         ND6_RUNLOCK();
13812                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "pfxrouter is installed\n");
13813                         return (1);
13814                 }
13815         }
13816         ND6_RUNLOCK();
13817         SCTPDBG(SCTP_DEBUG_OUTPUT2, "pfxrouter is not installed\n");
13818         return (0);
13819 }
13820 #endif
13821
13822 int
13823 sctp_v4src_match_nexthop(struct sctp_ifa *sifa, sctp_route_t *ro)
13824 {
13825 #ifdef INET
13826         struct sockaddr_in *sin, *mask;
13827         struct ifaddr *ifa;
13828         struct in_addr srcnetaddr, gwnetaddr;
13829
13830         if (ro == NULL || ro->ro_rt == NULL ||
13831             sifa->address.sa.sa_family != AF_INET) {
13832                 return (0);
13833         }
13834         ifa = (struct ifaddr *)sifa->ifa;
13835         mask = (struct sockaddr_in *)(ifa->ifa_netmask);
13836         sin = &sifa->address.sin;
13837         srcnetaddr.s_addr = (sin->sin_addr.s_addr & mask->sin_addr.s_addr);
13838         SCTPDBG(SCTP_DEBUG_OUTPUT1, "match_nexthop4: src address is ");
13839         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, &sifa->address.sa);
13840         SCTPDBG(SCTP_DEBUG_OUTPUT1, "network address is %x\n", srcnetaddr.s_addr);
13841
13842         sin = (struct sockaddr_in *)ro->ro_rt->rt_gateway;
13843         gwnetaddr.s_addr = (sin->sin_addr.s_addr & mask->sin_addr.s_addr);
13844         SCTPDBG(SCTP_DEBUG_OUTPUT1, "match_nexthop4: nexthop is ");
13845         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, ro->ro_rt->rt_gateway);
13846         SCTPDBG(SCTP_DEBUG_OUTPUT1, "network address is %x\n", gwnetaddr.s_addr);
13847         if (srcnetaddr.s_addr == gwnetaddr.s_addr) {
13848                 return (1);
13849         }
13850 #endif
13851         return (0);
13852 }