sys/netinet/sctp_output.c

   1 /*-
   2  * SPDX-License-Identifier: BSD-3-Clause
   3  *
   4  * Copyright (c) 2001-2008, by Cisco Systems, Inc. All rights reserved.
   5  * Copyright (c) 2008-2012, by Randall Stewart. All rights reserved.
   6  * Copyright (c) 2008-2012, by Michael Tuexen. All rights reserved.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions are met:
  10  *
  11  * a) Redistributions of source code must retain the above copyright notice,
  12  *    this list of conditions and the following disclaimer.
  13  *
  14  * b) Redistributions in binary form must reproduce the above copyright
  15  *    notice, this list of conditions and the following disclaimer in
  16  *    the documentation and/or other materials provided with the distribution.
  17  *
  18  * c) Neither the name of Cisco Systems, Inc. nor the names of its
  19  *    contributors may be used to endorse or promote products derived
  20  *    from this software without specific prior written permission.
  21  *
  22  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  23  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
  24  * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  25  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
  26  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  27  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  28  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  29  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  30  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  31  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
  32  * THE POSSIBILITY OF SUCH DAMAGE.
  33  */
  34
  35 #include <sys/cdefs.h>
  36 __FBSDID("$FreeBSD$");
  37
  38 #include <netinet/sctp_os.h>
  39 #include <sys/proc.h>
  40 #include <netinet/sctp_var.h>
  41 #include <netinet/sctp_sysctl.h>
  42 #include <netinet/sctp_header.h>
  43 #include <netinet/sctp_pcb.h>
  44 #include <netinet/sctputil.h>
  45 #include <netinet/sctp_output.h>
  46 #include <netinet/sctp_uio.h>
  47 #include <netinet/sctputil.h>
  48 #include <netinet/sctp_auth.h>
  49 #include <netinet/sctp_timer.h>
  50 #include <netinet/sctp_asconf.h>
  51 #include <netinet/sctp_indata.h>
  52 #include <netinet/sctp_bsd_addr.h>
  53 #include <netinet/sctp_input.h>
  54 #include <netinet/sctp_crc32.h>
  55 #include <netinet/sctp_kdtrace.h>
  56 #if defined(INET) || defined(INET6)
  57 #include <netinet/udp.h>
  58 #endif
  59 #include <netinet/udp_var.h>
  60 #include <machine/in_cksum.h>
  61
  62 #define SCTP_MAX_GAPS_INARRAY 4
  63 struct sack_track {
  64         uint8_t right_edge;     /* mergable on the right edge */
  65         uint8_t left_edge;      /* mergable on the left edge */
  66         uint8_t num_entries;
  67         uint8_t spare;
  68         struct sctp_gap_ack_block gaps[SCTP_MAX_GAPS_INARRAY];
  69 };
  70
  71 const struct sack_track sack_array[256] = {
  72         {0, 0, 0, 0,            /* 0x00 */
  73                 {{0, 0},
  74                 {0, 0},
  75                 {0, 0},
  76                 {0, 0}
  77                 }
  78         },
  79         {1, 0, 1, 0,            /* 0x01 */
  80                 {{0, 0},
  81                 {0, 0},
  82                 {0, 0},
  83                 {0, 0}
  84                 }
  85         },
  86         {0, 0, 1, 0,            /* 0x02 */
  87                 {{1, 1},
  88                 {0, 0},
  89                 {0, 0},
  90                 {0, 0}
  91                 }
  92         },
  93         {1, 0, 1, 0,            /* 0x03 */
  94                 {{0, 1},
  95                 {0, 0},
  96                 {0, 0},
  97                 {0, 0}
  98                 }
  99         },
 100         {0, 0, 1, 0,            /* 0x04 */
 101                 {{2, 2},
 102                 {0, 0},
 103                 {0, 0},
 104                 {0, 0}
 105                 }
 106         },
 107         {1, 0, 2, 0,            /* 0x05 */
 108                 {{0, 0},
 109                 {2, 2},
 110                 {0, 0},
 111                 {0, 0}
 112                 }
 113         },
 114         {0, 0, 1, 0,            /* 0x06 */
 115                 {{1, 2},
 116                 {0, 0},
 117                 {0, 0},
 118                 {0, 0}
 119                 }
 120         },
 121         {1, 0, 1, 0,            /* 0x07 */
 122                 {{0, 2},
 123                 {0, 0},
 124                 {0, 0},
 125                 {0, 0}
 126                 }
 127         },
 128         {0, 0, 1, 0,            /* 0x08 */
 129                 {{3, 3},
 130                 {0, 0},
 131                 {0, 0},
 132                 {0, 0}
 133                 }
 134         },
 135         {1, 0, 2, 0,            /* 0x09 */
 136                 {{0, 0},
 137                 {3, 3},
 138                 {0, 0},
 139                 {0, 0}
 140                 }
 141         },
 142         {0, 0, 2, 0,            /* 0x0a */
 143                 {{1, 1},
 144                 {3, 3},
 145                 {0, 0},
 146                 {0, 0}
 147                 }
 148         },
 149         {1, 0, 2, 0,            /* 0x0b */
 150                 {{0, 1},
 151                 {3, 3},
 152                 {0, 0},
 153                 {0, 0}
 154                 }
 155         },
 156         {0, 0, 1, 0,            /* 0x0c */
 157                 {{2, 3},
 158                 {0, 0},
 159                 {0, 0},
 160                 {0, 0}
 161                 }
 162         },
 163         {1, 0, 2, 0,            /* 0x0d */
 164                 {{0, 0},
 165                 {2, 3},
 166                 {0, 0},
 167                 {0, 0}
 168                 }
 169         },
 170         {0, 0, 1, 0,            /* 0x0e */
 171                 {{1, 3},
 172                 {0, 0},
 173                 {0, 0},
 174                 {0, 0}
 175                 }
 176         },
 177         {1, 0, 1, 0,            /* 0x0f */
 178                 {{0, 3},
 179                 {0, 0},
 180                 {0, 0},
 181                 {0, 0}
 182                 }
 183         },
 184         {0, 0, 1, 0,            /* 0x10 */
 185                 {{4, 4},
 186                 {0, 0},
 187                 {0, 0},
 188                 {0, 0}
 189                 }
 190         },
 191         {1, 0, 2, 0,            /* 0x11 */
 192                 {{0, 0},
 193                 {4, 4},
 194                 {0, 0},
 195                 {0, 0}
 196                 }
 197         },
 198         {0, 0, 2, 0,            /* 0x12 */
 199                 {{1, 1},
 200                 {4, 4},
 201                 {0, 0},
 202                 {0, 0}
 203                 }
 204         },
 205         {1, 0, 2, 0,            /* 0x13 */
 206                 {{0, 1},
 207                 {4, 4},
 208                 {0, 0},
 209                 {0, 0}
 210                 }
 211         },
 212         {0, 0, 2, 0,            /* 0x14 */
 213                 {{2, 2},
 214                 {4, 4},
 215                 {0, 0},
 216                 {0, 0}
 217                 }
 218         },
 219         {1, 0, 3, 0,            /* 0x15 */
 220                 {{0, 0},
 221                 {2, 2},
 222                 {4, 4},
 223                 {0, 0}
 224                 }
 225         },
 226         {0, 0, 2, 0,            /* 0x16 */
 227                 {{1, 2},
 228                 {4, 4},
 229                 {0, 0},
 230                 {0, 0}
 231                 }
 232         },
 233         {1, 0, 2, 0,            /* 0x17 */
 234                 {{0, 2},
 235                 {4, 4},
 236                 {0, 0},
 237                 {0, 0}
 238                 }
 239         },
 240         {0, 0, 1, 0,            /* 0x18 */
 241                 {{3, 4},
 242                 {0, 0},
 243                 {0, 0},
 244                 {0, 0}
 245                 }
 246         },
 247         {1, 0, 2, 0,            /* 0x19 */
 248                 {{0, 0},
 249                 {3, 4},
 250                 {0, 0},
 251                 {0, 0}
 252                 }
 253         },
 254         {0, 0, 2, 0,            /* 0x1a */
 255                 {{1, 1},
 256                 {3, 4},
 257                 {0, 0},
 258                 {0, 0}
 259                 }
 260         },
 261         {1, 0, 2, 0,            /* 0x1b */
 262                 {{0, 1},
 263                 {3, 4},
 264                 {0, 0},
 265                 {0, 0}
 266                 }
 267         },
 268         {0, 0, 1, 0,            /* 0x1c */
 269                 {{2, 4},
 270                 {0, 0},
 271                 {0, 0},
 272                 {0, 0}
 273                 }
 274         },
 275         {1, 0, 2, 0,            /* 0x1d */
 276                 {{0, 0},
 277                 {2, 4},
 278                 {0, 0},
 279                 {0, 0}
 280                 }
 281         },
 282         {0, 0, 1, 0,            /* 0x1e */
 283                 {{1, 4},
 284                 {0, 0},
 285                 {0, 0},
 286                 {0, 0}
 287                 }
 288         },
 289         {1, 0, 1, 0,            /* 0x1f */
 290                 {{0, 4},
 291                 {0, 0},
 292                 {0, 0},
 293                 {0, 0}
 294                 }
 295         },
 296         {0, 0, 1, 0,            /* 0x20 */
 297                 {{5, 5},
 298                 {0, 0},
 299                 {0, 0},
 300                 {0, 0}
 301                 }
 302         },
 303         {1, 0, 2, 0,            /* 0x21 */
 304                 {{0, 0},
 305                 {5, 5},
 306                 {0, 0},
 307                 {0, 0}
 308                 }
 309         },
 310         {0, 0, 2, 0,            /* 0x22 */
 311                 {{1, 1},
 312                 {5, 5},
 313                 {0, 0},
 314                 {0, 0}
 315                 }
 316         },
 317         {1, 0, 2, 0,            /* 0x23 */
 318                 {{0, 1},
 319                 {5, 5},
 320                 {0, 0},
 321                 {0, 0}
 322                 }
 323         },
 324         {0, 0, 2, 0,            /* 0x24 */
 325                 {{2, 2},
 326                 {5, 5},
 327                 {0, 0},
 328                 {0, 0}
 329                 }
 330         },
 331         {1, 0, 3, 0,            /* 0x25 */
 332                 {{0, 0},
 333                 {2, 2},
 334                 {5, 5},
 335                 {0, 0}
 336                 }
 337         },
 338         {0, 0, 2, 0,            /* 0x26 */
 339                 {{1, 2},
 340                 {5, 5},
 341                 {0, 0},
 342                 {0, 0}
 343                 }
 344         },
 345         {1, 0, 2, 0,            /* 0x27 */
 346                 {{0, 2},
 347                 {5, 5},
 348                 {0, 0},
 349                 {0, 0}
 350                 }
 351         },
 352         {0, 0, 2, 0,            /* 0x28 */
 353                 {{3, 3},
 354                 {5, 5},
 355                 {0, 0},
 356                 {0, 0}
 357                 }
 358         },
 359         {1, 0, 3, 0,            /* 0x29 */
 360                 {{0, 0},
 361                 {3, 3},
 362                 {5, 5},
 363                 {0, 0}
 364                 }
 365         },
 366         {0, 0, 3, 0,            /* 0x2a */
 367                 {{1, 1},
 368                 {3, 3},
 369                 {5, 5},
 370                 {0, 0}
 371                 }
 372         },
 373         {1, 0, 3, 0,            /* 0x2b */
 374                 {{0, 1},
 375                 {3, 3},
 376                 {5, 5},
 377                 {0, 0}
 378                 }
 379         },
 380         {0, 0, 2, 0,            /* 0x2c */
 381                 {{2, 3},
 382                 {5, 5},
 383                 {0, 0},
 384                 {0, 0}
 385                 }
 386         },
 387         {1, 0, 3, 0,            /* 0x2d */
 388                 {{0, 0},
 389                 {2, 3},
 390                 {5, 5},
 391                 {0, 0}
 392                 }
 393         },
 394         {0, 0, 2, 0,            /* 0x2e */
 395                 {{1, 3},
 396                 {5, 5},
 397                 {0, 0},
 398                 {0, 0}
 399                 }
 400         },
 401         {1, 0, 2, 0,            /* 0x2f */
 402                 {{0, 3},
 403                 {5, 5},
 404                 {0, 0},
 405                 {0, 0}
 406                 }
 407         },
 408         {0, 0, 1, 0,            /* 0x30 */
 409                 {{4, 5},
 410                 {0, 0},
 411                 {0, 0},
 412                 {0, 0}
 413                 }
 414         },
 415         {1, 0, 2, 0,            /* 0x31 */
 416                 {{0, 0},
 417                 {4, 5},
 418                 {0, 0},
 419                 {0, 0}
 420                 }
 421         },
 422         {0, 0, 2, 0,            /* 0x32 */
 423                 {{1, 1},
 424                 {4, 5},
 425                 {0, 0},
 426                 {0, 0}
 427                 }
 428         },
 429         {1, 0, 2, 0,            /* 0x33 */
 430                 {{0, 1},
 431                 {4, 5},
 432                 {0, 0},
 433                 {0, 0}
 434                 }
 435         },
 436         {0, 0, 2, 0,            /* 0x34 */
 437                 {{2, 2},
 438                 {4, 5},
 439                 {0, 0},
 440                 {0, 0}
 441                 }
 442         },
 443         {1, 0, 3, 0,            /* 0x35 */
 444                 {{0, 0},
 445                 {2, 2},
 446                 {4, 5},
 447                 {0, 0}
 448                 }
 449         },
 450         {0, 0, 2, 0,            /* 0x36 */
 451                 {{1, 2},
 452                 {4, 5},
 453                 {0, 0},
 454                 {0, 0}
 455                 }
 456         },
 457         {1, 0, 2, 0,            /* 0x37 */
 458                 {{0, 2},
 459                 {4, 5},
 460                 {0, 0},
 461                 {0, 0}
 462                 }
 463         },
 464         {0, 0, 1, 0,            /* 0x38 */
 465                 {{3, 5},
 466                 {0, 0},
 467                 {0, 0},
 468                 {0, 0}
 469                 }
 470         },
 471         {1, 0, 2, 0,            /* 0x39 */
 472                 {{0, 0},
 473                 {3, 5},
 474                 {0, 0},
 475                 {0, 0}
 476                 }
 477         },
 478         {0, 0, 2, 0,            /* 0x3a */
 479                 {{1, 1},
 480                 {3, 5},
 481                 {0, 0},
 482                 {0, 0}
 483                 }
 484         },
 485         {1, 0, 2, 0,            /* 0x3b */
 486                 {{0, 1},
 487                 {3, 5},
 488                 {0, 0},
 489                 {0, 0}
 490                 }
 491         },
 492         {0, 0, 1, 0,            /* 0x3c */
 493                 {{2, 5},
 494                 {0, 0},
 495                 {0, 0},
 496                 {0, 0}
 497                 }
 498         },
 499         {1, 0, 2, 0,            /* 0x3d */
 500                 {{0, 0},
 501                 {2, 5},
 502                 {0, 0},
 503                 {0, 0}
 504                 }
 505         },
 506         {0, 0, 1, 0,            /* 0x3e */
 507                 {{1, 5},
 508                 {0, 0},
 509                 {0, 0},
 510                 {0, 0}
 511                 }
 512         },
 513         {1, 0, 1, 0,            /* 0x3f */
 514                 {{0, 5},
 515                 {0, 0},
 516                 {0, 0},
 517                 {0, 0}
 518                 }
 519         },
 520         {0, 0, 1, 0,            /* 0x40 */
 521                 {{6, 6},
 522                 {0, 0},
 523                 {0, 0},
 524                 {0, 0}
 525                 }
 526         },
 527         {1, 0, 2, 0,            /* 0x41 */
 528                 {{0, 0},
 529                 {6, 6},
 530                 {0, 0},
 531                 {0, 0}
 532                 }
 533         },
 534         {0, 0, 2, 0,            /* 0x42 */
 535                 {{1, 1},
 536                 {6, 6},
 537                 {0, 0},
 538                 {0, 0}
 539                 }
 540         },
 541         {1, 0, 2, 0,            /* 0x43 */
 542                 {{0, 1},
 543                 {6, 6},
 544                 {0, 0},
 545                 {0, 0}
 546                 }
 547         },
 548         {0, 0, 2, 0,            /* 0x44 */
 549                 {{2, 2},
 550                 {6, 6},
 551                 {0, 0},
 552                 {0, 0}
 553                 }
 554         },
 555         {1, 0, 3, 0,            /* 0x45 */
 556                 {{0, 0},
 557                 {2, 2},
 558                 {6, 6},
 559                 {0, 0}
 560                 }
 561         },
 562         {0, 0, 2, 0,            /* 0x46 */
 563                 {{1, 2},
 564                 {6, 6},
 565                 {0, 0},
 566                 {0, 0}
 567                 }
 568         },
 569         {1, 0, 2, 0,            /* 0x47 */
 570                 {{0, 2},
 571                 {6, 6},
 572                 {0, 0},
 573                 {0, 0}
 574                 }
 575         },
 576         {0, 0, 2, 0,            /* 0x48 */
 577                 {{3, 3},
 578                 {6, 6},
 579                 {0, 0},
 580                 {0, 0}
 581                 }
 582         },
 583         {1, 0, 3, 0,            /* 0x49 */
 584                 {{0, 0},
 585                 {3, 3},
 586                 {6, 6},
 587                 {0, 0}
 588                 }
 589         },
 590         {0, 0, 3, 0,            /* 0x4a */
 591                 {{1, 1},
 592                 {3, 3},
 593                 {6, 6},
 594                 {0, 0}
 595                 }
 596         },
 597         {1, 0, 3, 0,            /* 0x4b */
 598                 {{0, 1},
 599                 {3, 3},
 600                 {6, 6},
 601                 {0, 0}
 602                 }
 603         },
 604         {0, 0, 2, 0,            /* 0x4c */
 605                 {{2, 3},
 606                 {6, 6},
 607                 {0, 0},
 608                 {0, 0}
 609                 }
 610         },
 611         {1, 0, 3, 0,            /* 0x4d */
 612                 {{0, 0},
 613                 {2, 3},
 614                 {6, 6},
 615                 {0, 0}
 616                 }
 617         },
 618         {0, 0, 2, 0,            /* 0x4e */
 619                 {{1, 3},
 620                 {6, 6},
 621                 {0, 0},
 622                 {0, 0}
 623                 }
 624         },
 625         {1, 0, 2, 0,            /* 0x4f */
 626                 {{0, 3},
 627                 {6, 6},
 628                 {0, 0},
 629                 {0, 0}
 630                 }
 631         },
 632         {0, 0, 2, 0,            /* 0x50 */
 633                 {{4, 4},
 634                 {6, 6},
 635                 {0, 0},
 636                 {0, 0}
 637                 }
 638         },
 639         {1, 0, 3, 0,            /* 0x51 */
 640                 {{0, 0},
 641                 {4, 4},
 642                 {6, 6},
 643                 {0, 0}
 644                 }
 645         },
 646         {0, 0, 3, 0,            /* 0x52 */
 647                 {{1, 1},
 648                 {4, 4},
 649                 {6, 6},
 650                 {0, 0}
 651                 }
 652         },
 653         {1, 0, 3, 0,            /* 0x53 */
 654                 {{0, 1},
 655                 {4, 4},
 656                 {6, 6},
 657                 {0, 0}
 658                 }
 659         },
 660         {0, 0, 3, 0,            /* 0x54 */
 661                 {{2, 2},
 662                 {4, 4},
 663                 {6, 6},
 664                 {0, 0}
 665                 }
 666         },
 667         {1, 0, 4, 0,            /* 0x55 */
 668                 {{0, 0},
 669                 {2, 2},
 670                 {4, 4},
 671                 {6, 6}
 672                 }
 673         },
 674         {0, 0, 3, 0,            /* 0x56 */
 675                 {{1, 2},
 676                 {4, 4},
 677                 {6, 6},
 678                 {0, 0}
 679                 }
 680         },
 681         {1, 0, 3, 0,            /* 0x57 */
 682                 {{0, 2},
 683                 {4, 4},
 684                 {6, 6},
 685                 {0, 0}
 686                 }
 687         },
 688         {0, 0, 2, 0,            /* 0x58 */
 689                 {{3, 4},
 690                 {6, 6},
 691                 {0, 0},
 692                 {0, 0}
 693                 }
 694         },
 695         {1, 0, 3, 0,            /* 0x59 */
 696                 {{0, 0},
 697                 {3, 4},
 698                 {6, 6},
 699                 {0, 0}
 700                 }
 701         },
 702         {0, 0, 3, 0,            /* 0x5a */
 703                 {{1, 1},
 704                 {3, 4},
 705                 {6, 6},
 706                 {0, 0}
 707                 }
 708         },
 709         {1, 0, 3, 0,            /* 0x5b */
 710                 {{0, 1},
 711                 {3, 4},
 712                 {6, 6},
 713                 {0, 0}
 714                 }
 715         },
 716         {0, 0, 2, 0,            /* 0x5c */
 717                 {{2, 4},
 718                 {6, 6},
 719                 {0, 0},
 720                 {0, 0}
 721                 }
 722         },
 723         {1, 0, 3, 0,            /* 0x5d */
 724                 {{0, 0},
 725                 {2, 4},
 726                 {6, 6},
 727                 {0, 0}
 728                 }
 729         },
 730         {0, 0, 2, 0,            /* 0x5e */
 731                 {{1, 4},
 732                 {6, 6},
 733                 {0, 0},
 734                 {0, 0}
 735                 }
 736         },
 737         {1, 0, 2, 0,            /* 0x5f */
 738                 {{0, 4},
 739                 {6, 6},
 740                 {0, 0},
 741                 {0, 0}
 742                 }
 743         },
 744         {0, 0, 1, 0,            /* 0x60 */
 745                 {{5, 6},
 746                 {0, 0},
 747                 {0, 0},
 748                 {0, 0}
 749                 }
 750         },
 751         {1, 0, 2, 0,            /* 0x61 */
 752                 {{0, 0},
 753                 {5, 6},
 754                 {0, 0},
 755                 {0, 0}
 756                 }
 757         },
 758         {0, 0, 2, 0,            /* 0x62 */
 759                 {{1, 1},
 760                 {5, 6},
 761                 {0, 0},
 762                 {0, 0}
 763                 }
 764         },
 765         {1, 0, 2, 0,            /* 0x63 */
 766                 {{0, 1},
 767                 {5, 6},
 768                 {0, 0},
 769                 {0, 0}
 770                 }
 771         },
 772         {0, 0, 2, 0,            /* 0x64 */
 773                 {{2, 2},
 774                 {5, 6},
 775                 {0, 0},
 776                 {0, 0}
 777                 }
 778         },
 779         {1, 0, 3, 0,            /* 0x65 */
 780                 {{0, 0},
 781                 {2, 2},
 782                 {5, 6},
 783                 {0, 0}
 784                 }
 785         },
 786         {0, 0, 2, 0,            /* 0x66 */
 787                 {{1, 2},
 788                 {5, 6},
 789                 {0, 0},
 790                 {0, 0}
 791                 }
 792         },
 793         {1, 0, 2, 0,            /* 0x67 */
 794                 {{0, 2},
 795                 {5, 6},
 796                 {0, 0},
 797                 {0, 0}
 798                 }
 799         },
 800         {0, 0, 2, 0,            /* 0x68 */
 801                 {{3, 3},
 802                 {5, 6},
 803                 {0, 0},
 804                 {0, 0}
 805                 }
 806         },
 807         {1, 0, 3, 0,            /* 0x69 */
 808                 {{0, 0},
 809                 {3, 3},
 810                 {5, 6},
 811                 {0, 0}
 812                 }
 813         },
 814         {0, 0, 3, 0,            /* 0x6a */
 815                 {{1, 1},
 816                 {3, 3},
 817                 {5, 6},
 818                 {0, 0}
 819                 }
 820         },
 821         {1, 0, 3, 0,            /* 0x6b */
 822                 {{0, 1},
 823                 {3, 3},
 824                 {5, 6},
 825                 {0, 0}
 826                 }
 827         },
 828         {0, 0, 2, 0,            /* 0x6c */
 829                 {{2, 3},
 830                 {5, 6},
 831                 {0, 0},
 832                 {0, 0}
 833                 }
 834         },
 835         {1, 0, 3, 0,            /* 0x6d */
 836                 {{0, 0},
 837                 {2, 3},
 838                 {5, 6},
 839                 {0, 0}
 840                 }
 841         },
 842         {0, 0, 2, 0,            /* 0x6e */
 843                 {{1, 3},
 844                 {5, 6},
 845                 {0, 0},
 846                 {0, 0}
 847                 }
 848         },
 849         {1, 0, 2, 0,            /* 0x6f */
 850                 {{0, 3},
 851                 {5, 6},
 852                 {0, 0},
 853                 {0, 0}
 854                 }
 855         },
 856         {0, 0, 1, 0,            /* 0x70 */
 857                 {{4, 6},
 858                 {0, 0},
 859                 {0, 0},
 860                 {0, 0}
 861                 }
 862         },
 863         {1, 0, 2, 0,            /* 0x71 */
 864                 {{0, 0},
 865                 {4, 6},
 866                 {0, 0},
 867                 {0, 0}
 868                 }
 869         },
 870         {0, 0, 2, 0,            /* 0x72 */
 871                 {{1, 1},
 872                 {4, 6},
 873                 {0, 0},
 874                 {0, 0}
 875                 }
 876         },
 877         {1, 0, 2, 0,            /* 0x73 */
 878                 {{0, 1},
 879                 {4, 6},
 880                 {0, 0},
 881                 {0, 0}
 882                 }
 883         },
 884         {0, 0, 2, 0,            /* 0x74 */
 885                 {{2, 2},
 886                 {4, 6},
 887                 {0, 0},
 888                 {0, 0}
 889                 }
 890         },
 891         {1, 0, 3, 0,            /* 0x75 */
 892                 {{0, 0},
 893                 {2, 2},
 894                 {4, 6},
 895                 {0, 0}
 896                 }
 897         },
 898         {0, 0, 2, 0,            /* 0x76 */
 899                 {{1, 2},
 900                 {4, 6},
 901                 {0, 0},
 902                 {0, 0}
 903                 }
 904         },
 905         {1, 0, 2, 0,            /* 0x77 */
 906                 {{0, 2},
 907                 {4, 6},
 908                 {0, 0},
 909                 {0, 0}
 910                 }
 911         },
 912         {0, 0, 1, 0,            /* 0x78 */
 913                 {{3, 6},
 914                 {0, 0},
 915                 {0, 0},
 916                 {0, 0}
 917                 }
 918         },
 919         {1, 0, 2, 0,            /* 0x79 */
 920                 {{0, 0},
 921                 {3, 6},
 922                 {0, 0},
 923                 {0, 0}
 924                 }
 925         },
 926         {0, 0, 2, 0,            /* 0x7a */
 927                 {{1, 1},
 928                 {3, 6},
 929                 {0, 0},
 930                 {0, 0}
 931                 }
 932         },
 933         {1, 0, 2, 0,            /* 0x7b */
 934                 {{0, 1},
 935                 {3, 6},
 936                 {0, 0},
 937                 {0, 0}
 938                 }
 939         },
 940         {0, 0, 1, 0,            /* 0x7c */
 941                 {{2, 6},
 942                 {0, 0},
 943                 {0, 0},
 944                 {0, 0}
 945                 }
 946         },
 947         {1, 0, 2, 0,            /* 0x7d */
 948                 {{0, 0},
 949                 {2, 6},
 950                 {0, 0},
 951                 {0, 0}
 952                 }
 953         },
 954         {0, 0, 1, 0,            /* 0x7e */
 955                 {{1, 6},
 956                 {0, 0},
 957                 {0, 0},
 958                 {0, 0}
 959                 }
 960         },
 961         {1, 0, 1, 0,            /* 0x7f */
 962                 {{0, 6},
 963                 {0, 0},
 964                 {0, 0},
 965                 {0, 0}
 966                 }
 967         },
 968         {0, 1, 1, 0,            /* 0x80 */
 969                 {{7, 7},
 970                 {0, 0},
 971                 {0, 0},
 972                 {0, 0}
 973                 }
 974         },
 975         {1, 1, 2, 0,            /* 0x81 */
 976                 {{0, 0},
 977                 {7, 7},
 978                 {0, 0},
 979                 {0, 0}
 980                 }
 981         },
 982         {0, 1, 2, 0,            /* 0x82 */
 983                 {{1, 1},
 984                 {7, 7},
 985                 {0, 0},
 986                 {0, 0}
 987                 }
 988         },
 989         {1, 1, 2, 0,            /* 0x83 */
 990                 {{0, 1},
 991                 {7, 7},
 992                 {0, 0},
 993                 {0, 0}
 994                 }
 995         },
 996         {0, 1, 2, 0,            /* 0x84 */
 997                 {{2, 2},
 998                 {7, 7},
 999                 {0, 0},
1000                 {0, 0}
1001                 }
1002         },
1003         {1, 1, 3, 0,            /* 0x85 */
1004                 {{0, 0},
1005                 {2, 2},
1006                 {7, 7},
1007                 {0, 0}
1008                 }
1009         },
1010         {0, 1, 2, 0,            /* 0x86 */
1011                 {{1, 2},
1012                 {7, 7},
1013                 {0, 0},
1014                 {0, 0}
1015                 }
1016         },
1017         {1, 1, 2, 0,            /* 0x87 */
1018                 {{0, 2},
1019                 {7, 7},
1020                 {0, 0},
1021                 {0, 0}
1022                 }
1023         },
1024         {0, 1, 2, 0,            /* 0x88 */
1025                 {{3, 3},
1026                 {7, 7},
1027                 {0, 0},
1028                 {0, 0}
1029                 }
1030         },
1031         {1, 1, 3, 0,            /* 0x89 */
1032                 {{0, 0},
1033                 {3, 3},
1034                 {7, 7},
1035                 {0, 0}
1036                 }
1037         },
1038         {0, 1, 3, 0,            /* 0x8a */
1039                 {{1, 1},
1040                 {3, 3},
1041                 {7, 7},
1042                 {0, 0}
1043                 }
1044         },
1045         {1, 1, 3, 0,            /* 0x8b */
1046                 {{0, 1},
1047                 {3, 3},
1048                 {7, 7},
1049                 {0, 0}
1050                 }
1051         },
1052         {0, 1, 2, 0,            /* 0x8c */
1053                 {{2, 3},
1054                 {7, 7},
1055                 {0, 0},
1056                 {0, 0}
1057                 }
1058         },
1059         {1, 1, 3, 0,            /* 0x8d */
1060                 {{0, 0},
1061                 {2, 3},
1062                 {7, 7},
1063                 {0, 0}
1064                 }
1065         },
1066         {0, 1, 2, 0,            /* 0x8e */
1067                 {{1, 3},
1068                 {7, 7},
1069                 {0, 0},
1070                 {0, 0}
1071                 }
1072         },
1073         {1, 1, 2, 0,            /* 0x8f */
1074                 {{0, 3},
1075                 {7, 7},
1076                 {0, 0},
1077                 {0, 0}
1078                 }
1079         },
1080         {0, 1, 2, 0,            /* 0x90 */
1081                 {{4, 4},
1082                 {7, 7},
1083                 {0, 0},
1084                 {0, 0}
1085                 }
1086         },
1087         {1, 1, 3, 0,            /* 0x91 */
1088                 {{0, 0},
1089                 {4, 4},
1090                 {7, 7},
1091                 {0, 0}
1092                 }
1093         },
1094         {0, 1, 3, 0,            /* 0x92 */
1095                 {{1, 1},
1096                 {4, 4},
1097                 {7, 7},
1098                 {0, 0}
1099                 }
1100         },
1101         {1, 1, 3, 0,            /* 0x93 */
1102                 {{0, 1},
1103                 {4, 4},
1104                 {7, 7},
1105                 {0, 0}
1106                 }
1107         },
1108         {0, 1, 3, 0,            /* 0x94 */
1109                 {{2, 2},
1110                 {4, 4},
1111                 {7, 7},
1112                 {0, 0}
1113                 }
1114         },
1115         {1, 1, 4, 0,            /* 0x95 */
1116                 {{0, 0},
1117                 {2, 2},
1118                 {4, 4},
1119                 {7, 7}
1120                 }
1121         },
1122         {0, 1, 3, 0,            /* 0x96 */
1123                 {{1, 2},
1124                 {4, 4},
1125                 {7, 7},
1126                 {0, 0}
1127                 }
1128         },
1129         {1, 1, 3, 0,            /* 0x97 */
1130                 {{0, 2},
1131                 {4, 4},
1132                 {7, 7},
1133                 {0, 0}
1134                 }
1135         },
1136         {0, 1, 2, 0,            /* 0x98 */
1137                 {{3, 4},
1138                 {7, 7},
1139                 {0, 0},
1140                 {0, 0}
1141                 }
1142         },
1143         {1, 1, 3, 0,            /* 0x99 */
1144                 {{0, 0},
1145                 {3, 4},
1146                 {7, 7},
1147                 {0, 0}
1148                 }
1149         },
1150         {0, 1, 3, 0,            /* 0x9a */
1151                 {{1, 1},
1152                 {3, 4},
1153                 {7, 7},
1154                 {0, 0}
1155                 }
1156         },
1157         {1, 1, 3, 0,            /* 0x9b */
1158                 {{0, 1},
1159                 {3, 4},
1160                 {7, 7},
1161                 {0, 0}
1162                 }
1163         },
1164         {0, 1, 2, 0,            /* 0x9c */
1165                 {{2, 4},
1166                 {7, 7},
1167                 {0, 0},
1168                 {0, 0}
1169                 }
1170         },
1171         {1, 1, 3, 0,            /* 0x9d */
1172                 {{0, 0},
1173                 {2, 4},
1174                 {7, 7},
1175                 {0, 0}
1176                 }
1177         },
1178         {0, 1, 2, 0,            /* 0x9e */
1179                 {{1, 4},
1180                 {7, 7},
1181                 {0, 0},
1182                 {0, 0}
1183                 }
1184         },
1185         {1, 1, 2, 0,            /* 0x9f */
1186                 {{0, 4},
1187                 {7, 7},
1188                 {0, 0},
1189                 {0, 0}
1190                 }
1191         },
1192         {0, 1, 2, 0,            /* 0xa0 */
1193                 {{5, 5},
1194                 {7, 7},
1195                 {0, 0},
1196                 {0, 0}
1197                 }
1198         },
1199         {1, 1, 3, 0,            /* 0xa1 */
1200                 {{0, 0},
1201                 {5, 5},
1202                 {7, 7},
1203                 {0, 0}
1204                 }
1205         },
1206         {0, 1, 3, 0,            /* 0xa2 */
1207                 {{1, 1},
1208                 {5, 5},
1209                 {7, 7},
1210                 {0, 0}
1211                 }
1212         },
1213         {1, 1, 3, 0,            /* 0xa3 */
1214                 {{0, 1},
1215                 {5, 5},
1216                 {7, 7},
1217                 {0, 0}
1218                 }
1219         },
1220         {0, 1, 3, 0,            /* 0xa4 */
1221                 {{2, 2},
1222                 {5, 5},
1223                 {7, 7},
1224                 {0, 0}
1225                 }
1226         },
1227         {1, 1, 4, 0,            /* 0xa5 */
1228                 {{0, 0},
1229                 {2, 2},
1230                 {5, 5},
1231                 {7, 7}
1232                 }
1233         },
1234         {0, 1, 3, 0,            /* 0xa6 */
1235                 {{1, 2},
1236                 {5, 5},
1237                 {7, 7},
1238                 {0, 0}
1239                 }
1240         },
1241         {1, 1, 3, 0,            /* 0xa7 */
1242                 {{0, 2},
1243                 {5, 5},
1244                 {7, 7},
1245                 {0, 0}
1246                 }
1247         },
1248         {0, 1, 3, 0,            /* 0xa8 */
1249                 {{3, 3},
1250                 {5, 5},
1251                 {7, 7},
1252                 {0, 0}
1253                 }
1254         },
1255         {1, 1, 4, 0,            /* 0xa9 */
1256                 {{0, 0},
1257                 {3, 3},
1258                 {5, 5},
1259                 {7, 7}
1260                 }
1261         },
1262         {0, 1, 4, 0,            /* 0xaa */
1263                 {{1, 1},
1264                 {3, 3},
1265                 {5, 5},
1266                 {7, 7}
1267                 }
1268         },
1269         {1, 1, 4, 0,            /* 0xab */
1270                 {{0, 1},
1271                 {3, 3},
1272                 {5, 5},
1273                 {7, 7}
1274                 }
1275         },
1276         {0, 1, 3, 0,            /* 0xac */
1277                 {{2, 3},
1278                 {5, 5},
1279                 {7, 7},
1280                 {0, 0}
1281                 }
1282         },
1283         {1, 1, 4, 0,            /* 0xad */
1284                 {{0, 0},
1285                 {2, 3},
1286                 {5, 5},
1287                 {7, 7}
1288                 }
1289         },
1290         {0, 1, 3, 0,            /* 0xae */
1291                 {{1, 3},
1292                 {5, 5},
1293                 {7, 7},
1294                 {0, 0}
1295                 }
1296         },
1297         {1, 1, 3, 0,            /* 0xaf */
1298                 {{0, 3},
1299                 {5, 5},
1300                 {7, 7},
1301                 {0, 0}
1302                 }
1303         },
1304         {0, 1, 2, 0,            /* 0xb0 */
1305                 {{4, 5},
1306                 {7, 7},
1307                 {0, 0},
1308                 {0, 0}
1309                 }
1310         },
1311         {1, 1, 3, 0,            /* 0xb1 */
1312                 {{0, 0},
1313                 {4, 5},
1314                 {7, 7},
1315                 {0, 0}
1316                 }
1317         },
1318         {0, 1, 3, 0,            /* 0xb2 */
1319                 {{1, 1},
1320                 {4, 5},
1321                 {7, 7},
1322                 {0, 0}
1323                 }
1324         },
1325         {1, 1, 3, 0,            /* 0xb3 */
1326                 {{0, 1},
1327                 {4, 5},
1328                 {7, 7},
1329                 {0, 0}
1330                 }
1331         },
1332         {0, 1, 3, 0,            /* 0xb4 */
1333                 {{2, 2},
1334                 {4, 5},
1335                 {7, 7},
1336                 {0, 0}
1337                 }
1338         },
1339         {1, 1, 4, 0,            /* 0xb5 */
1340                 {{0, 0},
1341                 {2, 2},
1342                 {4, 5},
1343                 {7, 7}
1344                 }
1345         },
1346         {0, 1, 3, 0,            /* 0xb6 */
1347                 {{1, 2},
1348                 {4, 5},
1349                 {7, 7},
1350                 {0, 0}
1351                 }
1352         },
1353         {1, 1, 3, 0,            /* 0xb7 */
1354                 {{0, 2},
1355                 {4, 5},
1356                 {7, 7},
1357                 {0, 0}
1358                 }
1359         },
1360         {0, 1, 2, 0,            /* 0xb8 */
1361                 {{3, 5},
1362                 {7, 7},
1363                 {0, 0},
1364                 {0, 0}
1365                 }
1366         },
1367         {1, 1, 3, 0,            /* 0xb9 */
1368                 {{0, 0},
1369                 {3, 5},
1370                 {7, 7},
1371                 {0, 0}
1372                 }
1373         },
1374         {0, 1, 3, 0,            /* 0xba */
1375                 {{1, 1},
1376                 {3, 5},
1377                 {7, 7},
1378                 {0, 0}
1379                 }
1380         },
1381         {1, 1, 3, 0,            /* 0xbb */
1382                 {{0, 1},
1383                 {3, 5},
1384                 {7, 7},
1385                 {0, 0}
1386                 }
1387         },
1388         {0, 1, 2, 0,            /* 0xbc */
1389                 {{2, 5},
1390                 {7, 7},
1391                 {0, 0},
1392                 {0, 0}
1393                 }
1394         },
1395         {1, 1, 3, 0,            /* 0xbd */
1396                 {{0, 0},
1397                 {2, 5},
1398                 {7, 7},
1399                 {0, 0}
1400                 }
1401         },
1402         {0, 1, 2, 0,            /* 0xbe */
1403                 {{1, 5},
1404                 {7, 7},
1405                 {0, 0},
1406                 {0, 0}
1407                 }
1408         },
1409         {1, 1, 2, 0,            /* 0xbf */
1410                 {{0, 5},
1411                 {7, 7},
1412                 {0, 0},
1413                 {0, 0}
1414                 }
1415         },
1416         {0, 1, 1, 0,            /* 0xc0 */
1417                 {{6, 7},
1418                 {0, 0},
1419                 {0, 0},
1420                 {0, 0}
1421                 }
1422         },
1423         {1, 1, 2, 0,            /* 0xc1 */
1424                 {{0, 0},
1425                 {6, 7},
1426                 {0, 0},
1427                 {0, 0}
1428                 }
1429         },
1430         {0, 1, 2, 0,            /* 0xc2 */
1431                 {{1, 1},
1432                 {6, 7},
1433                 {0, 0},
1434                 {0, 0}
1435                 }
1436         },
1437         {1, 1, 2, 0,            /* 0xc3 */
1438                 {{0, 1},
1439                 {6, 7},
1440                 {0, 0},
1441                 {0, 0}
1442                 }
1443         },
1444         {0, 1, 2, 0,            /* 0xc4 */
1445                 {{2, 2},
1446                 {6, 7},
1447                 {0, 0},
1448                 {0, 0}
1449                 }
1450         },
1451         {1, 1, 3, 0,            /* 0xc5 */
1452                 {{0, 0},
1453                 {2, 2},
1454                 {6, 7},
1455                 {0, 0}
1456                 }
1457         },
1458         {0, 1, 2, 0,            /* 0xc6 */
1459                 {{1, 2},
1460                 {6, 7},
1461                 {0, 0},
1462                 {0, 0}
1463                 }
1464         },
1465         {1, 1, 2, 0,            /* 0xc7 */
1466                 {{0, 2},
1467                 {6, 7},
1468                 {0, 0},
1469                 {0, 0}
1470                 }
1471         },
1472         {0, 1, 2, 0,            /* 0xc8 */
1473                 {{3, 3},
1474                 {6, 7},
1475                 {0, 0},
1476                 {0, 0}
1477                 }
1478         },
1479         {1, 1, 3, 0,            /* 0xc9 */
1480                 {{0, 0},
1481                 {3, 3},
1482                 {6, 7},
1483                 {0, 0}
1484                 }
1485         },
1486         {0, 1, 3, 0,            /* 0xca */
1487                 {{1, 1},
1488                 {3, 3},
1489                 {6, 7},
1490                 {0, 0}
1491                 }
1492         },
1493         {1, 1, 3, 0,            /* 0xcb */
1494                 {{0, 1},
1495                 {3, 3},
1496                 {6, 7},
1497                 {0, 0}
1498                 }
1499         },
1500         {0, 1, 2, 0,            /* 0xcc */
1501                 {{2, 3},
1502                 {6, 7},
1503                 {0, 0},
1504                 {0, 0}
1505                 }
1506         },
1507         {1, 1, 3, 0,            /* 0xcd */
1508                 {{0, 0},
1509                 {2, 3},
1510                 {6, 7},
1511                 {0, 0}
1512                 }
1513         },
1514         {0, 1, 2, 0,            /* 0xce */
1515                 {{1, 3},
1516                 {6, 7},
1517                 {0, 0},
1518                 {0, 0}
1519                 }
1520         },
1521         {1, 1, 2, 0,            /* 0xcf */
1522                 {{0, 3},
1523                 {6, 7},
1524                 {0, 0},
1525                 {0, 0}
1526                 }
1527         },
1528         {0, 1, 2, 0,            /* 0xd0 */
1529                 {{4, 4},
1530                 {6, 7},
1531                 {0, 0},
1532                 {0, 0}
1533                 }
1534         },
1535         {1, 1, 3, 0,            /* 0xd1 */
1536                 {{0, 0},
1537                 {4, 4},
1538                 {6, 7},
1539                 {0, 0}
1540                 }
1541         },
1542         {0, 1, 3, 0,            /* 0xd2 */
1543                 {{1, 1},
1544                 {4, 4},
1545                 {6, 7},
1546                 {0, 0}
1547                 }
1548         },
1549         {1, 1, 3, 0,            /* 0xd3 */
1550                 {{0, 1},
1551                 {4, 4},
1552                 {6, 7},
1553                 {0, 0}
1554                 }
1555         },
1556         {0, 1, 3, 0,            /* 0xd4 */
1557                 {{2, 2},
1558                 {4, 4},
1559                 {6, 7},
1560                 {0, 0}
1561                 }
1562         },
1563         {1, 1, 4, 0,            /* 0xd5 */
1564                 {{0, 0},
1565                 {2, 2},
1566                 {4, 4},
1567                 {6, 7}
1568                 }
1569         },
1570         {0, 1, 3, 0,            /* 0xd6 */
1571                 {{1, 2},
1572                 {4, 4},
1573                 {6, 7},
1574                 {0, 0}
1575                 }
1576         },
1577         {1, 1, 3, 0,            /* 0xd7 */
1578                 {{0, 2},
1579                 {4, 4},
1580                 {6, 7},
1581                 {0, 0}
1582                 }
1583         },
1584         {0, 1, 2, 0,            /* 0xd8 */
1585                 {{3, 4},
1586                 {6, 7},
1587                 {0, 0},
1588                 {0, 0}
1589                 }
1590         },
1591         {1, 1, 3, 0,            /* 0xd9 */
1592                 {{0, 0},
1593                 {3, 4},
1594                 {6, 7},
1595                 {0, 0}
1596                 }
1597         },
1598         {0, 1, 3, 0,            /* 0xda */
1599                 {{1, 1},
1600                 {3, 4},
1601                 {6, 7},
1602                 {0, 0}
1603                 }
1604         },
1605         {1, 1, 3, 0,            /* 0xdb */
1606                 {{0, 1},
1607                 {3, 4},
1608                 {6, 7},
1609                 {0, 0}
1610                 }
1611         },
1612         {0, 1, 2, 0,            /* 0xdc */
1613                 {{2, 4},
1614                 {6, 7},
1615                 {0, 0},
1616                 {0, 0}
1617                 }
1618         },
1619         {1, 1, 3, 0,            /* 0xdd */
1620                 {{0, 0},
1621                 {2, 4},
1622                 {6, 7},
1623                 {0, 0}
1624                 }
1625         },
1626         {0, 1, 2, 0,            /* 0xde */
1627                 {{1, 4},
1628                 {6, 7},
1629                 {0, 0},
1630                 {0, 0}
1631                 }
1632         },
1633         {1, 1, 2, 0,            /* 0xdf */
1634                 {{0, 4},
1635                 {6, 7},
1636                 {0, 0},
1637                 {0, 0}
1638                 }
1639         },
1640         {0, 1, 1, 0,            /* 0xe0 */
1641                 {{5, 7},
1642                 {0, 0},
1643                 {0, 0},
1644                 {0, 0}
1645                 }
1646         },
1647         {1, 1, 2, 0,            /* 0xe1 */
1648                 {{0, 0},
1649                 {5, 7},
1650                 {0, 0},
1651                 {0, 0}
1652                 }
1653         },
1654         {0, 1, 2, 0,            /* 0xe2 */
1655                 {{1, 1},
1656                 {5, 7},
1657                 {0, 0},
1658                 {0, 0}
1659                 }
1660         },
1661         {1, 1, 2, 0,            /* 0xe3 */
1662                 {{0, 1},
1663                 {5, 7},
1664                 {0, 0},
1665                 {0, 0}
1666                 }
1667         },
1668         {0, 1, 2, 0,            /* 0xe4 */
1669                 {{2, 2},
1670                 {5, 7},
1671                 {0, 0},
1672                 {0, 0}
1673                 }
1674         },
1675         {1, 1, 3, 0,            /* 0xe5 */
1676                 {{0, 0},
1677                 {2, 2},
1678                 {5, 7},
1679                 {0, 0}
1680                 }
1681         },
1682         {0, 1, 2, 0,            /* 0xe6 */
1683                 {{1, 2},
1684                 {5, 7},
1685                 {0, 0},
1686                 {0, 0}
1687                 }
1688         },
1689         {1, 1, 2, 0,            /* 0xe7 */
1690                 {{0, 2},
1691                 {5, 7},
1692                 {0, 0},
1693                 {0, 0}
1694                 }
1695         },
1696         {0, 1, 2, 0,            /* 0xe8 */
1697                 {{3, 3},
1698                 {5, 7},
1699                 {0, 0},
1700                 {0, 0}
1701                 }
1702         },
1703         {1, 1, 3, 0,            /* 0xe9 */
1704                 {{0, 0},
1705                 {3, 3},
1706                 {5, 7},
1707                 {0, 0}
1708                 }
1709         },
1710         {0, 1, 3, 0,            /* 0xea */
1711                 {{1, 1},
1712                 {3, 3},
1713                 {5, 7},
1714                 {0, 0}
1715                 }
1716         },
1717         {1, 1, 3, 0,            /* 0xeb */
1718                 {{0, 1},
1719                 {3, 3},
1720                 {5, 7},
1721                 {0, 0}
1722                 }
1723         },
1724         {0, 1, 2, 0,            /* 0xec */
1725                 {{2, 3},
1726                 {5, 7},
1727                 {0, 0},
1728                 {0, 0}
1729                 }
1730         },
1731         {1, 1, 3, 0,            /* 0xed */
1732                 {{0, 0},
1733                 {2, 3},
1734                 {5, 7},
1735                 {0, 0}
1736                 }
1737         },
1738         {0, 1, 2, 0,            /* 0xee */
1739                 {{1, 3},
1740                 {5, 7},
1741                 {0, 0},
1742                 {0, 0}
1743                 }
1744         },
1745         {1, 1, 2, 0,            /* 0xef */
1746                 {{0, 3},
1747                 {5, 7},
1748                 {0, 0},
1749                 {0, 0}
1750                 }
1751         },
1752         {0, 1, 1, 0,            /* 0xf0 */
1753                 {{4, 7},
1754                 {0, 0},
1755                 {0, 0},
1756                 {0, 0}
1757                 }
1758         },
1759         {1, 1, 2, 0,            /* 0xf1 */
1760                 {{0, 0},
1761                 {4, 7},
1762                 {0, 0},
1763                 {0, 0}
1764                 }
1765         },
1766         {0, 1, 2, 0,            /* 0xf2 */
1767                 {{1, 1},
1768                 {4, 7},
1769                 {0, 0},
1770                 {0, 0}
1771                 }
1772         },
1773         {1, 1, 2, 0,            /* 0xf3 */
1774                 {{0, 1},
1775                 {4, 7},
1776                 {0, 0},
1777                 {0, 0}
1778                 }
1779         },
1780         {0, 1, 2, 0,            /* 0xf4 */
1781                 {{2, 2},
1782                 {4, 7},
1783                 {0, 0},
1784                 {0, 0}
1785                 }
1786         },
1787         {1, 1, 3, 0,            /* 0xf5 */
1788                 {{0, 0},
1789                 {2, 2},
1790                 {4, 7},
1791                 {0, 0}
1792                 }
1793         },
1794         {0, 1, 2, 0,            /* 0xf6 */
1795                 {{1, 2},
1796                 {4, 7},
1797                 {0, 0},
1798                 {0, 0}
1799                 }
1800         },
1801         {1, 1, 2, 0,            /* 0xf7 */
1802                 {{0, 2},
1803                 {4, 7},
1804                 {0, 0},
1805                 {0, 0}
1806                 }
1807         },
1808         {0, 1, 1, 0,            /* 0xf8 */
1809                 {{3, 7},
1810                 {0, 0},
1811                 {0, 0},
1812                 {0, 0}
1813                 }
1814         },
1815         {1, 1, 2, 0,            /* 0xf9 */
1816                 {{0, 0},
1817                 {3, 7},
1818                 {0, 0},
1819                 {0, 0}
1820                 }
1821         },
1822         {0, 1, 2, 0,            /* 0xfa */
1823                 {{1, 1},
1824                 {3, 7},
1825                 {0, 0},
1826                 {0, 0}
1827                 }
1828         },
1829         {1, 1, 2, 0,            /* 0xfb */
1830                 {{0, 1},
1831                 {3, 7},
1832                 {0, 0},
1833                 {0, 0}
1834                 }
1835         },
1836         {0, 1, 1, 0,            /* 0xfc */
1837                 {{2, 7},
1838                 {0, 0},
1839                 {0, 0},
1840                 {0, 0}
1841                 }
1842         },
1843         {1, 1, 2, 0,            /* 0xfd */
1844                 {{0, 0},
1845                 {2, 7},
1846                 {0, 0},
1847                 {0, 0}
1848                 }
1849         },
1850         {0, 1, 1, 0,            /* 0xfe */
1851                 {{1, 7},
1852                 {0, 0},
1853                 {0, 0},
1854                 {0, 0}
1855                 }
1856         },
1857         {1, 1, 1, 0,            /* 0xff */
1858                 {{0, 7},
1859                 {0, 0},
1860                 {0, 0},
1861                 {0, 0}
1862                 }
1863         }
1864 };
1865
1866 int
1867 sctp_is_address_in_scope(struct sctp_ifa *ifa,
1868     struct sctp_scoping *scope,
1869     int do_update)
1870 {
1871         if ((scope->loopback_scope == 0) &&
1872             (ifa->ifn_p) && SCTP_IFN_IS_IFT_LOOP(ifa->ifn_p)) {
1873                 /*
1874                  * skip loopback if not in scope *
1875                  */
1876                 return (0);
1877         }
1878         switch (ifa->address.sa.sa_family) {
1879 #ifdef INET
1880         case AF_INET:
1881                 if (scope->ipv4_addr_legal) {
1882                         struct sockaddr_in *sin;
1883
1884                         sin = &ifa->address.sin;
1885                         if (sin->sin_addr.s_addr == 0) {
1886                                 /* not in scope , unspecified */
1887                                 return (0);
1888                         }
1889                         if ((scope->ipv4_local_scope == 0) &&
1890                             (IN4_ISPRIVATE_ADDRESS(&sin->sin_addr))) {
1891                                 /* private address not in scope */
1892                                 return (0);
1893                         }
1894                 } else {
1895                         return (0);
1896                 }
1897                 break;
1898 #endif
1899 #ifdef INET6
1900         case AF_INET6:
1901                 if (scope->ipv6_addr_legal) {
1902                         struct sockaddr_in6 *sin6;
1903
1904                         /*
1905                          * Must update the flags,  bummer, which means any
1906                          * IFA locks must now be applied HERE <->
1907                          */
1908                         if (do_update) {
1909                                 sctp_gather_internal_ifa_flags(ifa);
1910                         }
1911                         if (ifa->localifa_flags & SCTP_ADDR_IFA_UNUSEABLE) {
1912                                 return (0);
1913                         }
1914                         /* ok to use deprecated addresses? */
1915                         sin6 = &ifa->address.sin6;
1916                         if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) {
1917                                 /* skip unspecifed addresses */
1918                                 return (0);
1919                         }
1920                         if (    /* (local_scope == 0) && */
1921                             (IN6_IS_ADDR_LINKLOCAL(&sin6->sin6_addr))) {
1922                                 return (0);
1923                         }
1924                         if ((scope->site_scope == 0) &&
1925                             (IN6_IS_ADDR_SITELOCAL(&sin6->sin6_addr))) {
1926                                 return (0);
1927                         }
1928                 } else {
1929                         return (0);
1930                 }
1931                 break;
1932 #endif
1933         default:
1934                 return (0);
1935         }
1936         return (1);
1937 }
1938
1939 static struct mbuf *
1940 sctp_add_addr_to_mbuf(struct mbuf *m, struct sctp_ifa *ifa, uint16_t *len)
1941 {
1942 #if defined(INET) || defined(INET6)
1943         struct sctp_paramhdr *paramh;
1944         struct mbuf *mret;
1945         uint16_t plen;
1946 #endif
1947
1948         switch (ifa->address.sa.sa_family) {
1949 #ifdef INET
1950         case AF_INET:
1951                 plen = (uint16_t)sizeof(struct sctp_ipv4addr_param);
1952                 break;
1953 #endif
1954 #ifdef INET6
1955         case AF_INET6:
1956                 plen = (uint16_t)sizeof(struct sctp_ipv6addr_param);
1957                 break;
1958 #endif
1959         default:
1960                 return (m);
1961         }
1962 #if defined(INET) || defined(INET6)
1963         if (M_TRAILINGSPACE(m) >= plen) {
1964                 /* easy side we just drop it on the end */
1965                 paramh = (struct sctp_paramhdr *)(SCTP_BUF_AT(m, SCTP_BUF_LEN(m)));
1966                 mret = m;
1967         } else {
1968                 /* Need more space */
1969                 mret = m;
1970                 while (SCTP_BUF_NEXT(mret) != NULL) {
1971                         mret = SCTP_BUF_NEXT(mret);
1972                 }
1973                 SCTP_BUF_NEXT(mret) = sctp_get_mbuf_for_msg(plen, 0, M_NOWAIT, 1, MT_DATA);
1974                 if (SCTP_BUF_NEXT(mret) == NULL) {
1975                         /* We are hosed, can't add more addresses */
1976                         return (m);
1977                 }
1978                 mret = SCTP_BUF_NEXT(mret);
1979                 paramh = mtod(mret, struct sctp_paramhdr *);
1980         }
1981         /* now add the parameter */
1982         switch (ifa->address.sa.sa_family) {
1983 #ifdef INET
1984         case AF_INET:
1985                 {
1986                         struct sctp_ipv4addr_param *ipv4p;
1987                         struct sockaddr_in *sin;
1988
1989                         sin = &ifa->address.sin;
1990                         ipv4p = (struct sctp_ipv4addr_param *)paramh;
1991                         paramh->param_type = htons(SCTP_IPV4_ADDRESS);
1992                         paramh->param_length = htons(plen);
1993                         ipv4p->addr = sin->sin_addr.s_addr;
1994                         SCTP_BUF_LEN(mret) += plen;
1995                         break;
1996                 }
1997 #endif
1998 #ifdef INET6
1999         case AF_INET6:
2000                 {
2001                         struct sctp_ipv6addr_param *ipv6p;
2002                         struct sockaddr_in6 *sin6;
2003
2004                         sin6 = &ifa->address.sin6;
2005                         ipv6p = (struct sctp_ipv6addr_param *)paramh;
2006                         paramh->param_type = htons(SCTP_IPV6_ADDRESS);
2007                         paramh->param_length = htons(plen);
2008                         memcpy(ipv6p->addr, &sin6->sin6_addr,
2009                             sizeof(ipv6p->addr));
2010                         /* clear embedded scope in the address */
2011                         in6_clearscope((struct in6_addr *)ipv6p->addr);
2012                         SCTP_BUF_LEN(mret) += plen;
2013                         break;
2014                 }
2015 #endif
2016         default:
2017                 return (m);
2018         }
2019         if (len != NULL) {
2020                 *len += plen;
2021         }
2022         return (mret);
2023 #endif
2024 }
2025
2026 struct mbuf *
2027 sctp_add_addresses_to_i_ia(struct sctp_inpcb *inp, struct sctp_tcb *stcb,
2028     struct sctp_scoping *scope,
2029     struct mbuf *m_at, int cnt_inits_to,
2030     uint16_t *padding_len, uint16_t *chunk_len)
2031 {
2032         struct sctp_vrf *vrf = NULL;
2033         int cnt, limit_out = 0, total_count;
2034         uint32_t vrf_id;
2035
2036         vrf_id = inp->def_vrf_id;
2037         SCTP_IPI_ADDR_RLOCK();
2038         vrf = sctp_find_vrf(vrf_id);
2039         if (vrf == NULL) {
2040                 SCTP_IPI_ADDR_RUNLOCK();
2041                 return (m_at);
2042         }
2043         if (inp->sctp_flags & SCTP_PCB_FLAGS_BOUNDALL) {
2044                 struct sctp_ifa *sctp_ifap;
2045                 struct sctp_ifn *sctp_ifnp;
2046
2047                 cnt = cnt_inits_to;
2048                 if (vrf->total_ifa_count > SCTP_COUNT_LIMIT) {
2049                         limit_out = 1;
2050                         cnt = SCTP_ADDRESS_LIMIT;
2051                         goto skip_count;
2052                 }
2053                 LIST_FOREACH(sctp_ifnp, &vrf->ifnlist, next_ifn) {
2054                         if ((scope->loopback_scope == 0) &&
2055                             SCTP_IFN_IS_IFT_LOOP(sctp_ifnp)) {
2056                                 /*
2057                                  * Skip loopback devices if loopback_scope
2058                                  * not set
2059                                  */
2060                                 continue;
2061                         }
2062                         LIST_FOREACH(sctp_ifap, &sctp_ifnp->ifalist, next_ifa) {
2063 #ifdef INET
2064                                 if ((sctp_ifap->address.sa.sa_family == AF_INET) &&
2065                                     (prison_check_ip4(inp->ip_inp.inp.inp_cred,
2066                                     &sctp_ifap->address.sin.sin_addr) != 0)) {
2067                                         continue;
2068                                 }
2069 #endif
2070 #ifdef INET6
2071                                 if ((sctp_ifap->address.sa.sa_family == AF_INET6) &&
2072                                     (prison_check_ip6(inp->ip_inp.inp.inp_cred,
2073                                     &sctp_ifap->address.sin6.sin6_addr) != 0)) {
2074                                         continue;
2075                                 }
2076 #endif
2077                                 if (sctp_is_addr_restricted(stcb, sctp_ifap)) {
2078                                         continue;
2079                                 }
2080                                 if (sctp_is_address_in_scope(sctp_ifap, scope, 1) == 0) {
2081                                         continue;
2082                                 }
2083                                 cnt++;
2084                                 if (cnt > SCTP_ADDRESS_LIMIT) {
2085                                         break;
2086                                 }
2087                         }
2088                         if (cnt > SCTP_ADDRESS_LIMIT) {
2089                                 break;
2090                         }
2091                 }
2092 skip_count:
2093                 if (cnt > 1) {
2094                         total_count = 0;
2095                         LIST_FOREACH(sctp_ifnp, &vrf->ifnlist, next_ifn) {
2096                                 cnt = 0;
2097                                 if ((scope->loopback_scope == 0) &&
2098                                     SCTP_IFN_IS_IFT_LOOP(sctp_ifnp)) {
2099                                         /*
2100                                          * Skip loopback devices if
2101                                          * loopback_scope not set
2102                                          */
2103                                         continue;
2104                                 }
2105                                 LIST_FOREACH(sctp_ifap, &sctp_ifnp->ifalist, next_ifa) {
2106 #ifdef INET
2107                                         if ((sctp_ifap->address.sa.sa_family == AF_INET) &&
2108                                             (prison_check_ip4(inp->ip_inp.inp.inp_cred,
2109                                             &sctp_ifap->address.sin.sin_addr) != 0)) {
2110                                                 continue;
2111                                         }
2112 #endif
2113 #ifdef INET6
2114                                         if ((sctp_ifap->address.sa.sa_family == AF_INET6) &&
2115                                             (prison_check_ip6(inp->ip_inp.inp.inp_cred,
2116                                             &sctp_ifap->address.sin6.sin6_addr) != 0)) {
2117                                                 continue;
2118                                         }
2119 #endif
2120                                         if (sctp_is_addr_restricted(stcb, sctp_ifap)) {
2121                                                 continue;
2122                                         }
2123                                         if (sctp_is_address_in_scope(sctp_ifap,
2124                                             scope, 0) == 0) {
2125                                                 continue;
2126                                         }
2127                                         if ((chunk_len != NULL) &&
2128                                             (padding_len != NULL) &&
2129                                             (*padding_len > 0)) {
2130                                                 memset(mtod(m_at, caddr_t)+*chunk_len, 0, *padding_len);
2131                                                 SCTP_BUF_LEN(m_at) += *padding_len;
2132                                                 *chunk_len += *padding_len;
2133                                                 *padding_len = 0;
2134                                         }
2135                                         m_at = sctp_add_addr_to_mbuf(m_at, sctp_ifap, chunk_len);
2136                                         if (limit_out) {
2137                                                 cnt++;
2138                                                 total_count++;
2139                                                 if (cnt >= 2) {
2140                                                         /*
2141                                                          * two from each
2142                                                          * address
2143                                                          */
2144                                                         break;
2145                                                 }
2146                                                 if (total_count > SCTP_ADDRESS_LIMIT) {
2147                                                         /* No more addresses */
2148                                                         break;
2149                                                 }
2150                                         }
2151                                 }
2152                         }
2153                 }
2154         } else {
2155                 struct sctp_laddr *laddr;
2156
2157                 cnt = cnt_inits_to;
2158                 /* First, how many ? */
2159                 LIST_FOREACH(laddr, &inp->sctp_addr_list, sctp_nxt_addr) {
2160                         if (laddr->ifa == NULL) {
2161                                 continue;
2162                         }
2163                         if (laddr->ifa->localifa_flags & SCTP_BEING_DELETED)
2164                                 /*
2165                                  * Address being deleted by the system, dont
2166                                  * list.
2167                                  */
2168                                 continue;
2169                         if (laddr->action == SCTP_DEL_IP_ADDRESS) {
2170                                 /*
2171                                  * Address being deleted on this ep don't
2172                                  * list.
2173                                  */
2174                                 continue;
2175                         }
2176                         if (sctp_is_address_in_scope(laddr->ifa,
2177                             scope, 1) == 0) {
2178                                 continue;
2179                         }
2180                         cnt++;
2181                 }
2182                 /*
2183                  * To get through a NAT we only list addresses if we have
2184                  * more than one. That way if you just bind a single address
2185                  * we let the source of the init dictate our address.
2186                  */
2187                 if (cnt > 1) {
2188                         cnt = cnt_inits_to;
2189                         LIST_FOREACH(laddr, &inp->sctp_addr_list, sctp_nxt_addr) {
2190                                 if (laddr->ifa == NULL) {
2191                                         continue;
2192                                 }
2193                                 if (laddr->ifa->localifa_flags & SCTP_BEING_DELETED) {
2194                                         continue;
2195                                 }
2196                                 if (sctp_is_address_in_scope(laddr->ifa,
2197                                     scope, 0) == 0) {
2198                                         continue;
2199                                 }
2200                                 if ((chunk_len != NULL) &&
2201                                     (padding_len != NULL) &&
2202                                     (*padding_len > 0)) {
2203                                         memset(mtod(m_at, caddr_t)+*chunk_len, 0, *padding_len);
2204                                         SCTP_BUF_LEN(m_at) += *padding_len;
2205                                         *chunk_len += *padding_len;
2206                                         *padding_len = 0;
2207                                 }
2208                                 m_at = sctp_add_addr_to_mbuf(m_at, laddr->ifa, chunk_len);
2209                                 cnt++;
2210                                 if (cnt >= SCTP_ADDRESS_LIMIT) {
2211                                         break;
2212                                 }
2213                         }
2214                 }
2215         }
2216         SCTP_IPI_ADDR_RUNLOCK();
2217         return (m_at);
2218 }
2219
2220 static struct sctp_ifa *
2221 sctp_is_ifa_addr_preferred(struct sctp_ifa *ifa,
2222     uint8_t dest_is_loop,
2223     uint8_t dest_is_priv,
2224     sa_family_t fam)
2225 {
2226         uint8_t dest_is_global = 0;
2227
2228         /* dest_is_priv is true if destination is a private address */
2229         /* dest_is_loop is true if destination is a loopback addresses */
2230
2231         /**
2232          * Here we determine if its a preferred address. A preferred address
2233          * means it is the same scope or higher scope then the destination.
2234          * L = loopback, P = private, G = global
2235          * -----------------------------------------
2236          *    src    |  dest | result
2237          *  ----------------------------------------
2238          *     L     |    L  |    yes
2239          *  -----------------------------------------
2240          *     P     |    L  |    yes-v4 no-v6
2241          *  -----------------------------------------
2242          *     G     |    L  |    yes-v4 no-v6
2243          *  -----------------------------------------
2244          *     L     |    P  |    no
2245          *  -----------------------------------------
2246          *     P     |    P  |    yes
2247          *  -----------------------------------------
2248          *     G     |    P  |    no
2249          *   -----------------------------------------
2250          *     L     |    G  |    no
2251          *   -----------------------------------------
2252          *     P     |    G  |    no
2253          *    -----------------------------------------
2254          *     G     |    G  |    yes
2255          *    -----------------------------------------
2256          */
2257
2258         if (ifa->address.sa.sa_family != fam) {
2259                 /* forget mis-matched family */
2260                 return (NULL);
2261         }
2262         if ((dest_is_priv == 0) && (dest_is_loop == 0)) {
2263                 dest_is_global = 1;
2264         }
2265         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Is destination preferred:");
2266         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, &ifa->address.sa);
2267         /* Ok the address may be ok */
2268 #ifdef INET6
2269         if (fam == AF_INET6) {
2270                 /* ok to use deprecated addresses? no lets not! */
2271                 if (ifa->localifa_flags & SCTP_ADDR_IFA_UNUSEABLE) {
2272                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:1\n");
2273                         return (NULL);
2274                 }
2275                 if (ifa->src_is_priv && !ifa->src_is_loop) {
2276                         if (dest_is_loop) {
2277                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:2\n");
2278                                 return (NULL);
2279                         }
2280                 }
2281                 if (ifa->src_is_glob) {
2282                         if (dest_is_loop) {
2283                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:3\n");
2284                                 return (NULL);
2285                         }
2286                 }
2287         }
2288 #endif
2289         /*
2290          * Now that we know what is what, implement or table this could in
2291          * theory be done slicker (it used to be), but this is
2292          * straightforward and easier to validate :-)
2293          */
2294         SCTPDBG(SCTP_DEBUG_OUTPUT3, "src_loop:%d src_priv:%d src_glob:%d\n",
2295             ifa->src_is_loop, ifa->src_is_priv, ifa->src_is_glob);
2296         SCTPDBG(SCTP_DEBUG_OUTPUT3, "dest_loop:%d dest_priv:%d dest_glob:%d\n",
2297             dest_is_loop, dest_is_priv, dest_is_global);
2298
2299         if ((ifa->src_is_loop) && (dest_is_priv)) {
2300                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:4\n");
2301                 return (NULL);
2302         }
2303         if ((ifa->src_is_glob) && (dest_is_priv)) {
2304                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:5\n");
2305                 return (NULL);
2306         }
2307         if ((ifa->src_is_loop) && (dest_is_global)) {
2308                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:6\n");
2309                 return (NULL);
2310         }
2311         if ((ifa->src_is_priv) && (dest_is_global)) {
2312                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:7\n");
2313                 return (NULL);
2314         }
2315         SCTPDBG(SCTP_DEBUG_OUTPUT3, "YES\n");
2316         /* its a preferred address */
2317         return (ifa);
2318 }
2319
2320 static struct sctp_ifa *
2321 sctp_is_ifa_addr_acceptable(struct sctp_ifa *ifa,
2322     uint8_t dest_is_loop,
2323     uint8_t dest_is_priv,
2324     sa_family_t fam)
2325 {
2326         uint8_t dest_is_global = 0;
2327
2328         /**
2329          * Here we determine if its a acceptable address. A acceptable
2330          * address means it is the same scope or higher scope but we can
2331          * allow for NAT which means its ok to have a global dest and a
2332          * private src.
2333          *
2334          * L = loopback, P = private, G = global
2335          * -----------------------------------------
2336          *  src    |  dest | result
2337          * -----------------------------------------
2338          *   L     |   L   |    yes
2339          *  -----------------------------------------
2340          *   P     |   L   |    yes-v4 no-v6
2341          *  -----------------------------------------
2342          *   G     |   L   |    yes
2343          * -----------------------------------------
2344          *   L     |   P   |    no
2345          * -----------------------------------------
2346          *   P     |   P   |    yes
2347          * -----------------------------------------
2348          *   G     |   P   |    yes - May not work
2349          * -----------------------------------------
2350          *   L     |   G   |    no
2351          * -----------------------------------------
2352          *   P     |   G   |    yes - May not work
2353          * -----------------------------------------
2354          *   G     |   G   |    yes
2355          * -----------------------------------------
2356          */
2357
2358         if (ifa->address.sa.sa_family != fam) {
2359                 /* forget non matching family */
2360                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "ifa_fam:%d fam:%d\n",
2361                     ifa->address.sa.sa_family, fam);
2362                 return (NULL);
2363         }
2364         /* Ok the address may be ok */
2365         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT3, &ifa->address.sa);
2366         SCTPDBG(SCTP_DEBUG_OUTPUT3, "dst_is_loop:%d dest_is_priv:%d\n",
2367             dest_is_loop, dest_is_priv);
2368         if ((dest_is_loop == 0) && (dest_is_priv == 0)) {
2369                 dest_is_global = 1;
2370         }
2371 #ifdef INET6
2372         if (fam == AF_INET6) {
2373                 /* ok to use deprecated addresses? */
2374                 if (ifa->localifa_flags & SCTP_ADDR_IFA_UNUSEABLE) {
2375                         return (NULL);
2376                 }
2377                 if (ifa->src_is_priv) {
2378                         /* Special case, linklocal to loop */
2379                         if (dest_is_loop)
2380                                 return (NULL);
2381                 }
2382         }
2383 #endif
2384         /*
2385          * Now that we know what is what, implement our table. This could in
2386          * theory be done slicker (it used to be), but this is
2387          * straightforward and easier to validate :-)
2388          */
2389         SCTPDBG(SCTP_DEBUG_OUTPUT3, "ifa->src_is_loop:%d dest_is_priv:%d\n",
2390             ifa->src_is_loop,
2391             dest_is_priv);
2392         if ((ifa->src_is_loop == 1) && (dest_is_priv)) {
2393                 return (NULL);
2394         }
2395         SCTPDBG(SCTP_DEBUG_OUTPUT3, "ifa->src_is_loop:%d dest_is_glob:%d\n",
2396             ifa->src_is_loop,
2397             dest_is_global);
2398         if ((ifa->src_is_loop == 1) && (dest_is_global)) {
2399                 return (NULL);
2400         }
2401         SCTPDBG(SCTP_DEBUG_OUTPUT3, "address is acceptable\n");
2402         /* its an acceptable address */
2403         return (ifa);
2404 }
2405
2406 int
2407 sctp_is_addr_restricted(struct sctp_tcb *stcb, struct sctp_ifa *ifa)
2408 {
2409         struct sctp_laddr *laddr;
2410
2411         if (stcb == NULL) {
2412                 /* There are no restrictions, no TCB :-) */
2413                 return (0);
2414         }
2415         LIST_FOREACH(laddr, &stcb->asoc.sctp_restricted_addrs, sctp_nxt_addr) {
2416                 if (laddr->ifa == NULL) {
2417                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "%s: NULL ifa\n",
2418                             __func__);
2419                         continue;
2420                 }
2421                 if (laddr->ifa == ifa) {
2422                         /* Yes it is on the list */
2423                         return (1);
2424                 }
2425         }
2426         return (0);
2427 }
2428
2429 int
2430 sctp_is_addr_in_ep(struct sctp_inpcb *inp, struct sctp_ifa *ifa)
2431 {
2432         struct sctp_laddr *laddr;
2433
2434         if (ifa == NULL)
2435                 return (0);
2436         LIST_FOREACH(laddr, &inp->sctp_addr_list, sctp_nxt_addr) {
2437                 if (laddr->ifa == NULL) {
2438                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "%s: NULL ifa\n",
2439                             __func__);
2440                         continue;
2441                 }
2442                 if ((laddr->ifa == ifa) && laddr->action == 0)
2443                         /* same pointer */
2444                         return (1);
2445         }
2446         return (0);
2447 }
2448
2449 static struct sctp_ifa *
2450 sctp_choose_boundspecific_inp(struct sctp_inpcb *inp,
2451     sctp_route_t *ro,
2452     uint32_t vrf_id,
2453     int non_asoc_addr_ok,
2454     uint8_t dest_is_priv,
2455     uint8_t dest_is_loop,
2456     sa_family_t fam)
2457 {
2458         struct sctp_laddr *laddr, *starting_point;
2459         void *ifn;
2460         int resettotop = 0;
2461         struct sctp_ifn *sctp_ifn;
2462         struct sctp_ifa *sctp_ifa, *sifa;
2463         struct sctp_vrf *vrf;
2464         uint32_t ifn_index;
2465
2466         vrf = sctp_find_vrf(vrf_id);
2467         if (vrf == NULL)
2468                 return (NULL);
2469
2470         ifn = SCTP_GET_IFN_VOID_FROM_ROUTE(ro);
2471         ifn_index = SCTP_GET_IF_INDEX_FROM_ROUTE(ro);
2472         sctp_ifn = sctp_find_ifn(ifn, ifn_index);
2473         /*
2474          * first question, is the ifn we will emit on in our list, if so, we
2475          * want such an address. Note that we first looked for a preferred
2476          * address.
2477          */
2478         if (sctp_ifn) {
2479                 /* is a preferred one on the interface we route out? */
2480                 LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
2481 #ifdef INET
2482                         if ((sctp_ifa->address.sa.sa_family == AF_INET) &&
2483                             (prison_check_ip4(inp->ip_inp.inp.inp_cred,
2484                             &sctp_ifa->address.sin.sin_addr) != 0)) {
2485                                 continue;
2486                         }
2487 #endif
2488 #ifdef INET6
2489                         if ((sctp_ifa->address.sa.sa_family == AF_INET6) &&
2490                             (prison_check_ip6(inp->ip_inp.inp.inp_cred,
2491                             &sctp_ifa->address.sin6.sin6_addr) != 0)) {
2492                                 continue;
2493                         }
2494 #endif
2495                         if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
2496                             (non_asoc_addr_ok == 0))
2497                                 continue;
2498                         sifa = sctp_is_ifa_addr_preferred(sctp_ifa,
2499                             dest_is_loop,
2500                             dest_is_priv, fam);
2501                         if (sifa == NULL)
2502                                 continue;
2503                         if (sctp_is_addr_in_ep(inp, sifa)) {
2504                                 atomic_add_int(&sifa->refcount, 1);
2505                                 return (sifa);
2506                         }
2507                 }
2508         }
2509         /*
2510          * ok, now we now need to find one on the list of the addresses. We
2511          * can't get one on the emitting interface so let's find first a
2512          * preferred one. If not that an acceptable one otherwise... we
2513          * return NULL.
2514          */
2515         starting_point = inp->next_addr_touse;
2516 once_again:
2517         if (inp->next_addr_touse == NULL) {
2518                 inp->next_addr_touse = LIST_FIRST(&inp->sctp_addr_list);
2519                 resettotop = 1;
2520         }
2521         for (laddr = inp->next_addr_touse; laddr;
2522             laddr = LIST_NEXT(laddr, sctp_nxt_addr)) {
2523                 if (laddr->ifa == NULL) {
2524                         /* address has been removed */
2525                         continue;
2526                 }
2527                 if (laddr->action == SCTP_DEL_IP_ADDRESS) {
2528                         /* address is being deleted */
2529                         continue;
2530                 }
2531                 sifa = sctp_is_ifa_addr_preferred(laddr->ifa, dest_is_loop,
2532                     dest_is_priv, fam);
2533                 if (sifa == NULL)
2534                         continue;
2535                 atomic_add_int(&sifa->refcount, 1);
2536                 return (sifa);
2537         }
2538         if (resettotop == 0) {
2539                 inp->next_addr_touse = NULL;
2540                 goto once_again;
2541         }
2542
2543         inp->next_addr_touse = starting_point;
2544         resettotop = 0;
2545 once_again_too:
2546         if (inp->next_addr_touse == NULL) {
2547                 inp->next_addr_touse = LIST_FIRST(&inp->sctp_addr_list);
2548                 resettotop = 1;
2549         }
2550
2551         /* ok, what about an acceptable address in the inp */
2552         for (laddr = inp->next_addr_touse; laddr;
2553             laddr = LIST_NEXT(laddr, sctp_nxt_addr)) {
2554                 if (laddr->ifa == NULL) {
2555                         /* address has been removed */
2556                         continue;
2557                 }
2558                 if (laddr->action == SCTP_DEL_IP_ADDRESS) {
2559                         /* address is being deleted */
2560                         continue;
2561                 }
2562                 sifa = sctp_is_ifa_addr_acceptable(laddr->ifa, dest_is_loop,
2563                     dest_is_priv, fam);
2564                 if (sifa == NULL)
2565                         continue;
2566                 atomic_add_int(&sifa->refcount, 1);
2567                 return (sifa);
2568         }
2569         if (resettotop == 0) {
2570                 inp->next_addr_touse = NULL;
2571                 goto once_again_too;
2572         }
2573
2574         /*
2575          * no address bound can be a source for the destination we are in
2576          * trouble
2577          */
2578         return (NULL);
2579 }
2580
2581 static struct sctp_ifa *
2582 sctp_choose_boundspecific_stcb(struct sctp_inpcb *inp,
2583     struct sctp_tcb *stcb,
2584     sctp_route_t *ro,
2585     uint32_t vrf_id,
2586     uint8_t dest_is_priv,
2587     uint8_t dest_is_loop,
2588     int non_asoc_addr_ok,
2589     sa_family_t fam)
2590 {
2591         struct sctp_laddr *laddr, *starting_point;
2592         void *ifn;
2593         struct sctp_ifn *sctp_ifn;
2594         struct sctp_ifa *sctp_ifa, *sifa;
2595         uint8_t start_at_beginning = 0;
2596         struct sctp_vrf *vrf;
2597         uint32_t ifn_index;
2598
2599         /*
2600          * first question, is the ifn we will emit on in our list, if so, we
2601          * want that one.
2602          */
2603         vrf = sctp_find_vrf(vrf_id);
2604         if (vrf == NULL)
2605                 return (NULL);
2606
2607         ifn = SCTP_GET_IFN_VOID_FROM_ROUTE(ro);
2608         ifn_index = SCTP_GET_IF_INDEX_FROM_ROUTE(ro);
2609         sctp_ifn = sctp_find_ifn(ifn, ifn_index);
2610
2611         /*
2612          * first question, is the ifn we will emit on in our list?  If so,
2613          * we want that one. First we look for a preferred. Second, we go
2614          * for an acceptable.
2615          */
2616         if (sctp_ifn) {
2617                 /* first try for a preferred address on the ep */
2618                 LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
2619 #ifdef INET
2620                         if ((sctp_ifa->address.sa.sa_family == AF_INET) &&
2621                             (prison_check_ip4(inp->ip_inp.inp.inp_cred,
2622                             &sctp_ifa->address.sin.sin_addr) != 0)) {
2623                                 continue;
2624                         }
2625 #endif
2626 #ifdef INET6
2627                         if ((sctp_ifa->address.sa.sa_family == AF_INET6) &&
2628                             (prison_check_ip6(inp->ip_inp.inp.inp_cred,
2629                             &sctp_ifa->address.sin6.sin6_addr) != 0)) {
2630                                 continue;
2631                         }
2632 #endif
2633                         if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) && (non_asoc_addr_ok == 0))
2634                                 continue;
2635                         if (sctp_is_addr_in_ep(inp, sctp_ifa)) {
2636                                 sifa = sctp_is_ifa_addr_preferred(sctp_ifa, dest_is_loop, dest_is_priv, fam);
2637                                 if (sifa == NULL)
2638                                         continue;
2639                                 if (((non_asoc_addr_ok == 0) &&
2640                                     (sctp_is_addr_restricted(stcb, sifa))) ||
2641                                     (non_asoc_addr_ok &&
2642                                     (sctp_is_addr_restricted(stcb, sifa)) &&
2643                                     (!sctp_is_addr_pending(stcb, sifa)))) {
2644                                         /* on the no-no list */
2645                                         continue;
2646                                 }
2647                                 atomic_add_int(&sifa->refcount, 1);
2648                                 return (sifa);
2649                         }
2650                 }
2651                 /* next try for an acceptable address on the ep */
2652                 LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
2653 #ifdef INET
2654                         if ((sctp_ifa->address.sa.sa_family == AF_INET) &&
2655                             (prison_check_ip4(inp->ip_inp.inp.inp_cred,
2656                             &sctp_ifa->address.sin.sin_addr) != 0)) {
2657                                 continue;
2658                         }
2659 #endif
2660 #ifdef INET6
2661                         if ((sctp_ifa->address.sa.sa_family == AF_INET6) &&
2662                             (prison_check_ip6(inp->ip_inp.inp.inp_cred,
2663                             &sctp_ifa->address.sin6.sin6_addr) != 0)) {
2664                                 continue;
2665                         }
2666 #endif
2667                         if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) && (non_asoc_addr_ok == 0))
2668                                 continue;
2669                         if (sctp_is_addr_in_ep(inp, sctp_ifa)) {
2670                                 sifa = sctp_is_ifa_addr_acceptable(sctp_ifa, dest_is_loop, dest_is_priv, fam);
2671                                 if (sifa == NULL)
2672                                         continue;
2673                                 if (((non_asoc_addr_ok == 0) &&
2674                                     (sctp_is_addr_restricted(stcb, sifa))) ||
2675                                     (non_asoc_addr_ok &&
2676                                     (sctp_is_addr_restricted(stcb, sifa)) &&
2677                                     (!sctp_is_addr_pending(stcb, sifa)))) {
2678                                         /* on the no-no list */
2679                                         continue;
2680                                 }
2681                                 atomic_add_int(&sifa->refcount, 1);
2682                                 return (sifa);
2683                         }
2684                 }
2685         }
2686         /*
2687          * if we can't find one like that then we must look at all addresses
2688          * bound to pick one at first preferable then secondly acceptable.
2689          */
2690         starting_point = stcb->asoc.last_used_address;
2691 sctp_from_the_top:
2692         if (stcb->asoc.last_used_address == NULL) {
2693                 start_at_beginning = 1;
2694                 stcb->asoc.last_used_address = LIST_FIRST(&inp->sctp_addr_list);
2695         }
2696         /* search beginning with the last used address */
2697         for (laddr = stcb->asoc.last_used_address; laddr;
2698             laddr = LIST_NEXT(laddr, sctp_nxt_addr)) {
2699                 if (laddr->ifa == NULL) {
2700                         /* address has been removed */
2701                         continue;
2702                 }
2703                 if (laddr->action == SCTP_DEL_IP_ADDRESS) {
2704                         /* address is being deleted */
2705                         continue;
2706                 }
2707                 sifa = sctp_is_ifa_addr_preferred(laddr->ifa, dest_is_loop, dest_is_priv, fam);
2708                 if (sifa == NULL)
2709                         continue;
2710                 if (((non_asoc_addr_ok == 0) &&
2711                     (sctp_is_addr_restricted(stcb, sifa))) ||
2712                     (non_asoc_addr_ok &&
2713                     (sctp_is_addr_restricted(stcb, sifa)) &&
2714                     (!sctp_is_addr_pending(stcb, sifa)))) {
2715                         /* on the no-no list */
2716                         continue;
2717                 }
2718                 stcb->asoc.last_used_address = laddr;
2719                 atomic_add_int(&sifa->refcount, 1);
2720                 return (sifa);
2721         }
2722         if (start_at_beginning == 0) {
2723                 stcb->asoc.last_used_address = NULL;
2724                 goto sctp_from_the_top;
2725         }
2726         /* now try for any higher scope than the destination */
2727         stcb->asoc.last_used_address = starting_point;
2728         start_at_beginning = 0;
2729 sctp_from_the_top2:
2730         if (stcb->asoc.last_used_address == NULL) {
2731                 start_at_beginning = 1;
2732                 stcb->asoc.last_used_address = LIST_FIRST(&inp->sctp_addr_list);
2733         }
2734         /* search beginning with the last used address */
2735         for (laddr = stcb->asoc.last_used_address; laddr;
2736             laddr = LIST_NEXT(laddr, sctp_nxt_addr)) {
2737                 if (laddr->ifa == NULL) {
2738                         /* address has been removed */
2739                         continue;
2740                 }
2741                 if (laddr->action == SCTP_DEL_IP_ADDRESS) {
2742                         /* address is being deleted */
2743                         continue;
2744                 }
2745                 sifa = sctp_is_ifa_addr_acceptable(laddr->ifa, dest_is_loop,
2746                     dest_is_priv, fam);
2747                 if (sifa == NULL)
2748                         continue;
2749                 if (((non_asoc_addr_ok == 0) &&
2750                     (sctp_is_addr_restricted(stcb, sifa))) ||
2751                     (non_asoc_addr_ok &&
2752                     (sctp_is_addr_restricted(stcb, sifa)) &&
2753                     (!sctp_is_addr_pending(stcb, sifa)))) {
2754                         /* on the no-no list */
2755                         continue;
2756                 }
2757                 stcb->asoc.last_used_address = laddr;
2758                 atomic_add_int(&sifa->refcount, 1);
2759                 return (sifa);
2760         }
2761         if (start_at_beginning == 0) {
2762                 stcb->asoc.last_used_address = NULL;
2763                 goto sctp_from_the_top2;
2764         }
2765         return (NULL);
2766 }
2767
2768 static struct sctp_ifa *
2769 sctp_select_nth_preferred_addr_from_ifn_boundall(struct sctp_ifn *ifn,
2770     struct sctp_inpcb *inp,
2771     struct sctp_tcb *stcb,
2772     int non_asoc_addr_ok,
2773     uint8_t dest_is_loop,
2774     uint8_t dest_is_priv,
2775     int addr_wanted,
2776     sa_family_t fam,
2777     sctp_route_t *ro)
2778 {
2779         struct sctp_ifa *ifa, *sifa;
2780         int num_eligible_addr = 0;
2781 #ifdef INET6
2782         struct sockaddr_in6 sin6, lsa6;
2783
2784         if (fam == AF_INET6) {
2785                 memcpy(&sin6, &ro->ro_dst, sizeof(struct sockaddr_in6));
2786                 (void)sa6_recoverscope(&sin6);
2787         }
2788 #endif                          /* INET6 */
2789         LIST_FOREACH(ifa, &ifn->ifalist, next_ifa) {
2790 #ifdef INET
2791                 if ((ifa->address.sa.sa_family == AF_INET) &&
2792                     (prison_check_ip4(inp->ip_inp.inp.inp_cred,
2793                     &ifa->address.sin.sin_addr) != 0)) {
2794                         continue;
2795                 }
2796 #endif
2797 #ifdef INET6
2798                 if ((ifa->address.sa.sa_family == AF_INET6) &&
2799                     (prison_check_ip6(inp->ip_inp.inp.inp_cred,
2800                     &ifa->address.sin6.sin6_addr) != 0)) {
2801                         continue;
2802                 }
2803 #endif
2804                 if ((ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
2805                     (non_asoc_addr_ok == 0))
2806                         continue;
2807                 sifa = sctp_is_ifa_addr_preferred(ifa, dest_is_loop,
2808                     dest_is_priv, fam);
2809                 if (sifa == NULL)
2810                         continue;
2811 #ifdef INET6
2812                 if (fam == AF_INET6 &&
2813                     dest_is_loop &&
2814                     sifa->src_is_loop && sifa->src_is_priv) {
2815                         /*
2816                          * don't allow fe80::1 to be a src on loop ::1, we
2817                          * don't list it to the peer so we will get an
2818                          * abort.
2819                          */
2820                         continue;
2821                 }
2822                 if (fam == AF_INET6 &&
2823                     IN6_IS_ADDR_LINKLOCAL(&sifa->address.sin6.sin6_addr) &&
2824                     IN6_IS_ADDR_LINKLOCAL(&sin6.sin6_addr)) {
2825                         /*
2826                          * link-local <-> link-local must belong to the same
2827                          * scope.
2828                          */
2829                         memcpy(&lsa6, &sifa->address.sin6, sizeof(struct sockaddr_in6));
2830                         (void)sa6_recoverscope(&lsa6);
2831                         if (sin6.sin6_scope_id != lsa6.sin6_scope_id) {
2832                                 continue;
2833                         }
2834                 }
2835 #endif                          /* INET6 */
2836
2837                 /*
2838                  * Check if the IPv6 address matches to next-hop. In the
2839                  * mobile case, old IPv6 address may be not deleted from the
2840                  * interface. Then, the interface has previous and new
2841                  * addresses.  We should use one corresponding to the
2842                  * next-hop.  (by micchie)
2843                  */
2844 #ifdef INET6
2845                 if (stcb && fam == AF_INET6 &&
2846                     sctp_is_mobility_feature_on(stcb->sctp_ep, SCTP_MOBILITY_BASE)) {
2847                         if (sctp_v6src_match_nexthop(&sifa->address.sin6, ro)
2848                             == 0) {
2849                                 continue;
2850                         }
2851                 }
2852 #endif
2853 #ifdef INET
2854                 /* Avoid topologically incorrect IPv4 address */
2855                 if (stcb && fam == AF_INET &&
2856                     sctp_is_mobility_feature_on(stcb->sctp_ep, SCTP_MOBILITY_BASE)) {
2857                         if (sctp_v4src_match_nexthop(sifa, ro) == 0) {
2858                                 continue;
2859                         }
2860                 }
2861 #endif
2862                 if (stcb) {
2863                         if (sctp_is_address_in_scope(ifa, &stcb->asoc.scope, 0) == 0) {
2864                                 continue;
2865                         }
2866                         if (((non_asoc_addr_ok == 0) &&
2867                             (sctp_is_addr_restricted(stcb, sifa))) ||
2868                             (non_asoc_addr_ok &&
2869                             (sctp_is_addr_restricted(stcb, sifa)) &&
2870                             (!sctp_is_addr_pending(stcb, sifa)))) {
2871                                 /*
2872                                  * It is restricted for some reason..
2873                                  * probably not yet added.
2874                                  */
2875                                 continue;
2876                         }
2877                 }
2878                 if (num_eligible_addr >= addr_wanted) {
2879                         return (sifa);
2880                 }
2881                 num_eligible_addr++;
2882         }
2883         return (NULL);
2884 }
2885
2886 static int
2887 sctp_count_num_preferred_boundall(struct sctp_ifn *ifn,
2888     struct sctp_inpcb *inp,
2889     struct sctp_tcb *stcb,
2890     int non_asoc_addr_ok,
2891     uint8_t dest_is_loop,
2892     uint8_t dest_is_priv,
2893     sa_family_t fam)
2894 {
2895         struct sctp_ifa *ifa, *sifa;
2896         int num_eligible_addr = 0;
2897
2898         LIST_FOREACH(ifa, &ifn->ifalist, next_ifa) {
2899 #ifdef INET
2900                 if ((ifa->address.sa.sa_family == AF_INET) &&
2901                     (prison_check_ip4(inp->ip_inp.inp.inp_cred,
2902                     &ifa->address.sin.sin_addr) != 0)) {
2903                         continue;
2904                 }
2905 #endif
2906 #ifdef INET6
2907                 if ((ifa->address.sa.sa_family == AF_INET6) &&
2908                     (stcb != NULL) &&
2909                     (prison_check_ip6(inp->ip_inp.inp.inp_cred,
2910                     &ifa->address.sin6.sin6_addr) != 0)) {
2911                         continue;
2912                 }
2913 #endif
2914                 if ((ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
2915                     (non_asoc_addr_ok == 0)) {
2916                         continue;
2917                 }
2918                 sifa = sctp_is_ifa_addr_preferred(ifa, dest_is_loop,
2919                     dest_is_priv, fam);
2920                 if (sifa == NULL) {
2921                         continue;
2922                 }
2923                 if (stcb) {
2924                         if (sctp_is_address_in_scope(ifa, &stcb->asoc.scope, 0) == 0) {
2925                                 continue;
2926                         }
2927                         if (((non_asoc_addr_ok == 0) &&
2928                             (sctp_is_addr_restricted(stcb, sifa))) ||
2929                             (non_asoc_addr_ok &&
2930                             (sctp_is_addr_restricted(stcb, sifa)) &&
2931                             (!sctp_is_addr_pending(stcb, sifa)))) {
2932                                 /*
2933                                  * It is restricted for some reason..
2934                                  * probably not yet added.
2935                                  */
2936                                 continue;
2937                         }
2938                 }
2939                 num_eligible_addr++;
2940         }
2941         return (num_eligible_addr);
2942 }
2943
2944 static struct sctp_ifa *
2945 sctp_choose_boundall(struct sctp_inpcb *inp,
2946     struct sctp_tcb *stcb,
2947     struct sctp_nets *net,
2948     sctp_route_t *ro,
2949     uint32_t vrf_id,
2950     uint8_t dest_is_priv,
2951     uint8_t dest_is_loop,
2952     int non_asoc_addr_ok,
2953     sa_family_t fam)
2954 {
2955         int cur_addr_num = 0, num_preferred = 0;
2956         void *ifn;
2957         struct sctp_ifn *sctp_ifn, *looked_at = NULL, *emit_ifn;
2958         struct sctp_ifa *sctp_ifa, *sifa;
2959         uint32_t ifn_index;
2960         struct sctp_vrf *vrf;
2961 #ifdef INET
2962         int retried = 0;
2963 #endif
2964
2965         /*-
2966          * For boundall we can use any address in the association.
2967          * If non_asoc_addr_ok is set we can use any address (at least in
2968          * theory). So we look for preferred addresses first. If we find one,
2969          * we use it. Otherwise we next try to get an address on the
2970          * interface, which we should be able to do (unless non_asoc_addr_ok
2971          * is false and we are routed out that way). In these cases where we
2972          * can't use the address of the interface we go through all the
2973          * ifn's looking for an address we can use and fill that in. Punting
2974          * means we send back address 0, which will probably cause problems
2975          * actually since then IP will fill in the address of the route ifn,
2976          * which means we probably already rejected it.. i.e. here comes an
2977          * abort :-<.
2978          */
2979         vrf = sctp_find_vrf(vrf_id);
2980         if (vrf == NULL)
2981                 return (NULL);
2982
2983         ifn = SCTP_GET_IFN_VOID_FROM_ROUTE(ro);
2984         ifn_index = SCTP_GET_IF_INDEX_FROM_ROUTE(ro);
2985         SCTPDBG(SCTP_DEBUG_OUTPUT2, "ifn from route:%p ifn_index:%d\n", ifn, ifn_index);
2986         emit_ifn = looked_at = sctp_ifn = sctp_find_ifn(ifn, ifn_index);
2987         if (sctp_ifn == NULL) {
2988                 /* ?? We don't have this guy ?? */
2989                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "No ifn emit interface?\n");
2990                 goto bound_all_plan_b;
2991         }
2992         SCTPDBG(SCTP_DEBUG_OUTPUT2, "ifn_index:%d name:%s is emit interface\n",
2993             ifn_index, sctp_ifn->ifn_name);
2994
2995         if (net) {
2996                 cur_addr_num = net->indx_of_eligible_next_to_use;
2997         }
2998         num_preferred = sctp_count_num_preferred_boundall(sctp_ifn,
2999             inp, stcb,
3000             non_asoc_addr_ok,
3001             dest_is_loop,
3002             dest_is_priv, fam);
3003         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Found %d preferred source addresses for intf:%s\n",
3004             num_preferred, sctp_ifn->ifn_name);
3005         if (num_preferred == 0) {
3006                 /*
3007                  * no eligible addresses, we must use some other interface
3008                  * address if we can find one.
3009                  */
3010                 goto bound_all_plan_b;
3011         }
3012         /*
3013          * Ok we have num_eligible_addr set with how many we can use, this
3014          * may vary from call to call due to addresses being deprecated
3015          * etc..
3016          */
3017         if (cur_addr_num >= num_preferred) {
3018                 cur_addr_num = 0;
3019         }
3020         /*
3021          * select the nth address from the list (where cur_addr_num is the
3022          * nth) and 0 is the first one, 1 is the second one etc...
3023          */
3024         SCTPDBG(SCTP_DEBUG_OUTPUT2, "cur_addr_num:%d\n", cur_addr_num);
3025
3026         sctp_ifa = sctp_select_nth_preferred_addr_from_ifn_boundall(sctp_ifn, inp, stcb, non_asoc_addr_ok, dest_is_loop,
3027             dest_is_priv, cur_addr_num, fam, ro);
3028
3029         /* if sctp_ifa is NULL something changed??, fall to plan b. */
3030         if (sctp_ifa) {
3031                 atomic_add_int(&sctp_ifa->refcount, 1);
3032                 if (net) {
3033                         /* save off where the next one we will want */
3034                         net->indx_of_eligible_next_to_use = cur_addr_num + 1;
3035                 }
3036                 return (sctp_ifa);
3037         }
3038         /*
3039          * plan_b: Look at all interfaces and find a preferred address. If
3040          * no preferred fall through to plan_c.
3041          */
3042 bound_all_plan_b:
3043         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Trying Plan B\n");
3044         LIST_FOREACH(sctp_ifn, &vrf->ifnlist, next_ifn) {
3045                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "Examine interface %s\n",
3046                     sctp_ifn->ifn_name);
3047                 if (dest_is_loop == 0 && SCTP_IFN_IS_IFT_LOOP(sctp_ifn)) {
3048                         /* wrong base scope */
3049                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "skip\n");
3050                         continue;
3051                 }
3052                 if ((sctp_ifn == looked_at) && looked_at) {
3053                         /* already looked at this guy */
3054                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "already seen\n");
3055                         continue;
3056                 }
3057                 num_preferred = sctp_count_num_preferred_boundall(sctp_ifn, inp, stcb, non_asoc_addr_ok,
3058                     dest_is_loop, dest_is_priv, fam);
3059                 SCTPDBG(SCTP_DEBUG_OUTPUT2,
3060                     "Found ifn:%p %d preferred source addresses\n",
3061                     ifn, num_preferred);
3062                 if (num_preferred == 0) {
3063                         /* None on this interface. */
3064                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "No preferred -- skipping to next\n");
3065                         continue;
3066                 }
3067                 SCTPDBG(SCTP_DEBUG_OUTPUT2,
3068                     "num preferred:%d on interface:%p cur_addr_num:%d\n",
3069                     num_preferred, (void *)sctp_ifn, cur_addr_num);
3070
3071                 /*
3072                  * Ok we have num_eligible_addr set with how many we can
3073                  * use, this may vary from call to call due to addresses
3074                  * being deprecated etc..
3075                  */
3076                 if (cur_addr_num >= num_preferred) {
3077                         cur_addr_num = 0;
3078                 }
3079                 sifa = sctp_select_nth_preferred_addr_from_ifn_boundall(sctp_ifn, inp, stcb, non_asoc_addr_ok, dest_is_loop,
3080                     dest_is_priv, cur_addr_num, fam, ro);
3081                 if (sifa == NULL)
3082                         continue;
3083                 if (net) {
3084                         net->indx_of_eligible_next_to_use = cur_addr_num + 1;
3085                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "we selected %d\n",
3086                             cur_addr_num);
3087                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Source:");
3088                         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, &sifa->address.sa);
3089                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Dest:");
3090                         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, &net->ro._l_addr.sa);
3091                 }
3092                 atomic_add_int(&sifa->refcount, 1);
3093                 return (sifa);
3094         }
3095 #ifdef INET
3096 again_with_private_addresses_allowed:
3097 #endif
3098         /* plan_c: do we have an acceptable address on the emit interface */
3099         sifa = NULL;
3100         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Trying Plan C: find acceptable on interface\n");
3101         if (emit_ifn == NULL) {
3102                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "Jump to Plan D - no emit_ifn\n");
3103                 goto plan_d;
3104         }
3105         LIST_FOREACH(sctp_ifa, &emit_ifn->ifalist, next_ifa) {
3106                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "ifa:%p\n", (void *)sctp_ifa);
3107 #ifdef INET
3108                 if ((sctp_ifa->address.sa.sa_family == AF_INET) &&
3109                     (prison_check_ip4(inp->ip_inp.inp.inp_cred,
3110                     &sctp_ifa->address.sin.sin_addr) != 0)) {
3111                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Jailed\n");
3112                         continue;
3113                 }
3114 #endif
3115 #ifdef INET6
3116                 if ((sctp_ifa->address.sa.sa_family == AF_INET6) &&
3117                     (prison_check_ip6(inp->ip_inp.inp.inp_cred,
3118                     &sctp_ifa->address.sin6.sin6_addr) != 0)) {
3119                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Jailed\n");
3120                         continue;
3121                 }
3122 #endif
3123                 if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
3124                     (non_asoc_addr_ok == 0)) {
3125                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Defer\n");
3126                         continue;
3127                 }
3128                 sifa = sctp_is_ifa_addr_acceptable(sctp_ifa, dest_is_loop,
3129                     dest_is_priv, fam);
3130                 if (sifa == NULL) {
3131                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "IFA not acceptable\n");
3132                         continue;
3133                 }
3134                 if (stcb) {
3135                         if (sctp_is_address_in_scope(sifa, &stcb->asoc.scope, 0) == 0) {
3136                                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "NOT in scope\n");
3137                                 sifa = NULL;
3138                                 continue;
3139                         }
3140                         if (((non_asoc_addr_ok == 0) &&
3141                             (sctp_is_addr_restricted(stcb, sifa))) ||
3142                             (non_asoc_addr_ok &&
3143                             (sctp_is_addr_restricted(stcb, sifa)) &&
3144                             (!sctp_is_addr_pending(stcb, sifa)))) {
3145                                 /*
3146                                  * It is restricted for some reason..
3147                                  * probably not yet added.
3148                                  */
3149                                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "Its restricted\n");
3150                                 sifa = NULL;
3151                                 continue;
3152                         }
3153                 }
3154                 atomic_add_int(&sifa->refcount, 1);
3155                 goto out;
3156         }
3157 plan_d:
3158         /*
3159          * plan_d: We are in trouble. No preferred address on the emit
3160          * interface. And not even a preferred address on all interfaces. Go
3161          * out and see if we can find an acceptable address somewhere
3162          * amongst all interfaces.
3163          */
3164         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Trying Plan D looked_at is %p\n", (void *)looked_at);
3165         LIST_FOREACH(sctp_ifn, &vrf->ifnlist, next_ifn) {
3166                 if (dest_is_loop == 0 && SCTP_IFN_IS_IFT_LOOP(sctp_ifn)) {
3167                         /* wrong base scope */
3168                         continue;
3169                 }
3170                 LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
3171 #ifdef INET
3172                         if ((sctp_ifa->address.sa.sa_family == AF_INET) &&
3173                             (prison_check_ip4(inp->ip_inp.inp.inp_cred,
3174                             &sctp_ifa->address.sin.sin_addr) != 0)) {
3175                                 continue;
3176                         }
3177 #endif
3178 #ifdef INET6
3179                         if ((sctp_ifa->address.sa.sa_family == AF_INET6) &&
3180                             (prison_check_ip6(inp->ip_inp.inp.inp_cred,
3181                             &sctp_ifa->address.sin6.sin6_addr) != 0)) {
3182                                 continue;
3183                         }
3184 #endif
3185                         if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
3186                             (non_asoc_addr_ok == 0))
3187                                 continue;
3188                         sifa = sctp_is_ifa_addr_acceptable(sctp_ifa,
3189                             dest_is_loop,
3190                             dest_is_priv, fam);
3191                         if (sifa == NULL)
3192                                 continue;
3193                         if (stcb) {
3194                                 if (sctp_is_address_in_scope(sifa, &stcb->asoc.scope, 0) == 0) {
3195                                         sifa = NULL;
3196                                         continue;
3197                                 }
3198                                 if (((non_asoc_addr_ok == 0) &&
3199                                     (sctp_is_addr_restricted(stcb, sifa))) ||
3200                                     (non_asoc_addr_ok &&
3201                                     (sctp_is_addr_restricted(stcb, sifa)) &&
3202                                     (!sctp_is_addr_pending(stcb, sifa)))) {
3203                                         /*
3204                                          * It is restricted for some
3205                                          * reason.. probably not yet added.
3206                                          */
3207                                         sifa = NULL;
3208                                         continue;
3209                                 }
3210                         }
3211                         goto out;
3212                 }
3213         }
3214 #ifdef INET
3215         if (stcb) {
3216                 if ((retried == 0) && (stcb->asoc.scope.ipv4_local_scope == 0)) {
3217                         stcb->asoc.scope.ipv4_local_scope = 1;
3218                         retried = 1;
3219                         goto again_with_private_addresses_allowed;
3220                 } else if (retried == 1) {
3221                         stcb->asoc.scope.ipv4_local_scope = 0;
3222                 }
3223         }
3224 #endif
3225 out:
3226 #ifdef INET
3227         if (sifa) {
3228                 if (retried == 1) {
3229                         LIST_FOREACH(sctp_ifn, &vrf->ifnlist, next_ifn) {
3230                                 if (dest_is_loop == 0 && SCTP_IFN_IS_IFT_LOOP(sctp_ifn)) {
3231                                         /* wrong base scope */
3232                                         continue;
3233                                 }
3234                                 LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
3235                                         struct sctp_ifa *tmp_sifa;
3236
3237 #ifdef INET
3238                                         if ((sctp_ifa->address.sa.sa_family == AF_INET) &&
3239                                             (prison_check_ip4(inp->ip_inp.inp.inp_cred,
3240                                             &sctp_ifa->address.sin.sin_addr) != 0)) {
3241                                                 continue;
3242                                         }
3243 #endif
3244 #ifdef INET6
3245                                         if ((sctp_ifa->address.sa.sa_family == AF_INET6) &&
3246                                             (prison_check_ip6(inp->ip_inp.inp.inp_cred,
3247                                             &sctp_ifa->address.sin6.sin6_addr) != 0)) {
3248                                                 continue;
3249                                         }
3250 #endif
3251                                         if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
3252                                             (non_asoc_addr_ok == 0))
3253                                                 continue;
3254                                         tmp_sifa = sctp_is_ifa_addr_acceptable(sctp_ifa,
3255                                             dest_is_loop,
3256                                             dest_is_priv, fam);
3257                                         if (tmp_sifa == NULL) {
3258                                                 continue;
3259                                         }
3260                                         if (tmp_sifa == sifa) {
3261                                                 continue;
3262                                         }
3263                                         if (stcb) {
3264                                                 if (sctp_is_address_in_scope(tmp_sifa,
3265                                                     &stcb->asoc.scope, 0) == 0) {
3266                                                         continue;
3267                                                 }
3268                                                 if (((non_asoc_addr_ok == 0) &&
3269                                                     (sctp_is_addr_restricted(stcb, tmp_sifa))) ||
3270                                                     (non_asoc_addr_ok &&
3271                                                     (sctp_is_addr_restricted(stcb, tmp_sifa)) &&
3272                                                     (!sctp_is_addr_pending(stcb, tmp_sifa)))) {
3273                                                         /*
3274                                                          * It is restricted
3275                                                          * for some reason..
3276                                                          * probably not yet
3277                                                          * added.
3278                                                          */
3279                                                         continue;
3280                                                 }
3281                                         }
3282                                         if ((tmp_sifa->address.sin.sin_family == AF_INET) &&
3283                                             (IN4_ISPRIVATE_ADDRESS(&(tmp_sifa->address.sin.sin_addr)))) {
3284                                                 sctp_add_local_addr_restricted(stcb, tmp_sifa);
3285                                         }
3286                                 }
3287                         }
3288                 }
3289                 atomic_add_int(&sifa->refcount, 1);
3290         }
3291 #endif
3292         return (sifa);
3293 }
3294
3295 /* tcb may be NULL */
3296 struct sctp_ifa *
3297 sctp_source_address_selection(struct sctp_inpcb *inp,
3298     struct sctp_tcb *stcb,
3299     sctp_route_t *ro,
3300     struct sctp_nets *net,
3301     int non_asoc_addr_ok, uint32_t vrf_id)
3302 {
3303         struct sctp_ifa *answer;
3304         uint8_t dest_is_priv, dest_is_loop;
3305         sa_family_t fam;
3306 #ifdef INET
3307         struct sockaddr_in *to = (struct sockaddr_in *)&ro->ro_dst;
3308 #endif
3309 #ifdef INET6
3310         struct sockaddr_in6 *to6 = (struct sockaddr_in6 *)&ro->ro_dst;
3311 #endif
3312
3313         /**
3314          * Rules:
3315          * - Find the route if needed, cache if I can.
3316          * - Look at interface address in route, Is it in the bound list. If so we
3317          *   have the best source.
3318          * - If not we must rotate amongst the addresses.
3319          *
3320          * Cavets and issues
3321          *
3322          * Do we need to pay attention to scope. We can have a private address
3323          * or a global address we are sourcing or sending to. So if we draw
3324          * it out
3325          * zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz
3326          * For V4
3327          * ------------------------------------------
3328          *      source     *      dest  *  result
3329          * -----------------------------------------
3330          * <a>  Private    *    Global  *  NAT
3331          * -----------------------------------------
3332          * <b>  Private    *    Private *  No problem
3333          * -----------------------------------------
3334          * <c>  Global     *    Private *  Huh, How will this work?
3335          * -----------------------------------------
3336          * <d>  Global     *    Global  *  No Problem
3337          *------------------------------------------
3338          * zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz
3339          * For V6
3340          *------------------------------------------
3341          *      source     *      dest  *  result
3342          * -----------------------------------------
3343          * <a>  Linklocal  *    Global  *
3344          * -----------------------------------------
3345          * <b>  Linklocal  * Linklocal  *  No problem
3346          * -----------------------------------------
3347          * <c>  Global     * Linklocal  *  Huh, How will this work?
3348          * -----------------------------------------
3349          * <d>  Global     *    Global  *  No Problem
3350          *------------------------------------------
3351          * zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz
3352          *
3353          * And then we add to that what happens if there are multiple addresses
3354          * assigned to an interface. Remember the ifa on a ifn is a linked
3355          * list of addresses. So one interface can have more than one IP
3356          * address. What happens if we have both a private and a global
3357          * address? Do we then use context of destination to sort out which
3358          * one is best? And what about NAT's sending P->G may get you a NAT
3359          * translation, or should you select the G thats on the interface in
3360          * preference.
3361          *
3362          * Decisions:
3363          *
3364          * - count the number of addresses on the interface.
3365          * - if it is one, no problem except case <c>.
3366          *   For <a> we will assume a NAT out there.
3367          * - if there are more than one, then we need to worry about scope P
3368          *   or G. We should prefer G -> G and P -> P if possible.
3369          *   Then as a secondary fall back to mixed types G->P being a last
3370          *   ditch one.
3371          * - The above all works for bound all, but bound specific we need to
3372          *   use the same concept but instead only consider the bound
3373          *   addresses. If the bound set is NOT assigned to the interface then
3374          *   we must use rotation amongst the bound addresses..
3375          */
3376         if (ro->ro_nh == NULL) {
3377                 /*
3378                  * Need a route to cache.
3379                  */
3380                 SCTP_RTALLOC(ro, vrf_id, inp->fibnum);
3381         }
3382         if (ro->ro_nh == NULL) {
3383                 return (NULL);
3384         }
3385         fam = ro->ro_dst.sa_family;
3386         dest_is_priv = dest_is_loop = 0;
3387         /* Setup our scopes for the destination */
3388         switch (fam) {
3389 #ifdef INET
3390         case AF_INET:
3391                 /* Scope based on outbound address */
3392                 if (IN4_ISLOOPBACK_ADDRESS(&to->sin_addr)) {
3393                         dest_is_loop = 1;
3394                         if (net != NULL) {
3395                                 /* mark it as local */
3396                                 net->addr_is_local = 1;
3397                         }
3398                 } else if ((IN4_ISPRIVATE_ADDRESS(&to->sin_addr))) {
3399                         dest_is_priv = 1;
3400                 }
3401                 break;
3402 #endif
3403 #ifdef INET6
3404         case AF_INET6:
3405                 /* Scope based on outbound address */
3406                 if (IN6_IS_ADDR_LOOPBACK(&to6->sin6_addr) ||
3407                     SCTP_ROUTE_IS_REAL_LOOP(ro)) {
3408                         /*
3409                          * If the address is a loopback address, which
3410                          * consists of "::1" OR "fe80::1%lo0", we are
3411                          * loopback scope. But we don't use dest_is_priv
3412                          * (link local addresses).
3413                          */
3414                         dest_is_loop = 1;
3415                         if (net != NULL) {
3416                                 /* mark it as local */
3417                                 net->addr_is_local = 1;
3418                         }
3419                 } else if (IN6_IS_ADDR_LINKLOCAL(&to6->sin6_addr)) {
3420                         dest_is_priv = 1;
3421                 }
3422                 break;
3423 #endif
3424         }
3425         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Select source addr for:");
3426         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)&ro->ro_dst);
3427         SCTP_IPI_ADDR_RLOCK();
3428         if (inp->sctp_flags & SCTP_PCB_FLAGS_BOUNDALL) {
3429                 /*
3430                  * Bound all case
3431                  */
3432                 answer = sctp_choose_boundall(inp, stcb, net, ro, vrf_id,
3433                     dest_is_priv, dest_is_loop,
3434                     non_asoc_addr_ok, fam);
3435                 SCTP_IPI_ADDR_RUNLOCK();
3436                 return (answer);
3437         }
3438         /*
3439          * Subset bound case
3440          */
3441         if (stcb) {
3442                 answer = sctp_choose_boundspecific_stcb(inp, stcb, ro,
3443                     vrf_id, dest_is_priv,
3444                     dest_is_loop,
3445                     non_asoc_addr_ok, fam);
3446         } else {
3447                 answer = sctp_choose_boundspecific_inp(inp, ro, vrf_id,
3448                     non_asoc_addr_ok,
3449                     dest_is_priv,
3450                     dest_is_loop, fam);
3451         }
3452         SCTP_IPI_ADDR_RUNLOCK();
3453         return (answer);
3454 }
3455
3456 static int
3457 sctp_find_cmsg(int c_type, void *data, struct mbuf *control, size_t cpsize)
3458 {
3459         struct cmsghdr cmh;
3460         struct sctp_sndinfo sndinfo;
3461         struct sctp_prinfo prinfo;
3462         struct sctp_authinfo authinfo;
3463         int tot_len, rem_len, cmsg_data_len, cmsg_data_off, off;
3464         int found;
3465
3466         /*
3467          * Independent of how many mbufs, find the c_type inside the control
3468          * structure and copy out the data.
3469          */
3470         found = 0;
3471         tot_len = SCTP_BUF_LEN(control);
3472         for (off = 0; off < tot_len; off += CMSG_ALIGN(cmh.cmsg_len)) {
3473                 rem_len = tot_len - off;
3474                 if (rem_len < (int)CMSG_ALIGN(sizeof(cmh))) {
3475                         /* There is not enough room for one more. */
3476                         return (found);
3477                 }
3478                 m_copydata(control, off, sizeof(cmh), (caddr_t)&cmh);
3479                 if (cmh.cmsg_len < CMSG_ALIGN(sizeof(cmh))) {
3480                         /* We dont't have a complete CMSG header. */
3481                         return (found);
3482                 }
3483                 if ((cmh.cmsg_len > INT_MAX) || ((int)cmh.cmsg_len > rem_len)) {
3484                         /* We don't have the complete CMSG. */
3485                         return (found);
3486                 }
3487                 cmsg_data_len = (int)cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh));
3488                 cmsg_data_off = off + CMSG_ALIGN(sizeof(cmh));
3489                 if ((cmh.cmsg_level == IPPROTO_SCTP) &&
3490                     ((c_type == cmh.cmsg_type) ||
3491                     ((c_type == SCTP_SNDRCV) &&
3492                     ((cmh.cmsg_type == SCTP_SNDINFO) ||
3493                     (cmh.cmsg_type == SCTP_PRINFO) ||
3494                     (cmh.cmsg_type == SCTP_AUTHINFO))))) {
3495                         if (c_type == cmh.cmsg_type) {
3496                                 if (cpsize > INT_MAX) {
3497                                         return (found);
3498                                 }
3499                                 if (cmsg_data_len < (int)cpsize) {
3500                                         return (found);
3501                                 }
3502                                 /* It is exactly what we want. Copy it out. */
3503                                 m_copydata(control, cmsg_data_off, (int)cpsize, (caddr_t)data);
3504                                 return (1);
3505                         } else {
3506                                 struct sctp_sndrcvinfo *sndrcvinfo;
3507
3508                                 sndrcvinfo = (struct sctp_sndrcvinfo *)data;
3509                                 if (found == 0) {
3510                                         if (cpsize < sizeof(struct sctp_sndrcvinfo)) {
3511                                                 return (found);
3512                                         }
3513                                         memset(sndrcvinfo, 0, sizeof(struct sctp_sndrcvinfo));
3514                                 }
3515                                 switch (cmh.cmsg_type) {
3516                                 case SCTP_SNDINFO:
3517                                         if (cmsg_data_len < (int)sizeof(struct sctp_sndinfo)) {
3518                                                 return (found);
3519                                         }
3520                                         m_copydata(control, cmsg_data_off, sizeof(struct sctp_sndinfo), (caddr_t)&sndinfo);
3521                                         sndrcvinfo->sinfo_stream = sndinfo.snd_sid;
3522                                         sndrcvinfo->sinfo_flags = sndinfo.snd_flags;
3523                                         sndrcvinfo->sinfo_ppid = sndinfo.snd_ppid;
3524                                         sndrcvinfo->sinfo_context = sndinfo.snd_context;
3525                                         sndrcvinfo->sinfo_assoc_id = sndinfo.snd_assoc_id;
3526                                         break;
3527                                 case SCTP_PRINFO:
3528                                         if (cmsg_data_len < (int)sizeof(struct sctp_prinfo)) {
3529                                                 return (found);
3530                                         }
3531                                         m_copydata(control, cmsg_data_off, sizeof(struct sctp_prinfo), (caddr_t)&prinfo);
3532                                         if (prinfo.pr_policy != SCTP_PR_SCTP_NONE) {
3533                                                 sndrcvinfo->sinfo_timetolive = prinfo.pr_value;
3534                                         } else {
3535                                                 sndrcvinfo->sinfo_timetolive = 0;
3536                                         }
3537                                         sndrcvinfo->sinfo_flags |= prinfo.pr_policy;
3538                                         break;
3539                                 case SCTP_AUTHINFO:
3540                                         if (cmsg_data_len < (int)sizeof(struct sctp_authinfo)) {
3541                                                 return (found);
3542                                         }
3543                                         m_copydata(control, cmsg_data_off, sizeof(struct sctp_authinfo), (caddr_t)&authinfo);
3544                                         sndrcvinfo->sinfo_keynumber_valid = 1;
3545                                         sndrcvinfo->sinfo_keynumber = authinfo.auth_keynumber;
3546                                         break;
3547                                 default:
3548                                         return (found);
3549                                 }
3550                                 found = 1;
3551                         }
3552                 }
3553         }
3554         return (found);
3555 }
3556
3557 static int
3558 sctp_process_cmsgs_for_init(struct sctp_tcb *stcb, struct mbuf *control, int *error)
3559 {
3560         struct cmsghdr cmh;
3561         struct sctp_initmsg initmsg;
3562 #ifdef INET
3563         struct sockaddr_in sin;
3564 #endif
3565 #ifdef INET6
3566         struct sockaddr_in6 sin6;
3567 #endif
3568         int tot_len, rem_len, cmsg_data_len, cmsg_data_off, off;
3569
3570         tot_len = SCTP_BUF_LEN(control);
3571         for (off = 0; off < tot_len; off += CMSG_ALIGN(cmh.cmsg_len)) {
3572                 rem_len = tot_len - off;
3573                 if (rem_len < (int)CMSG_ALIGN(sizeof(cmh))) {
3574                         /* There is not enough room for one more. */
3575                         *error = EINVAL;
3576                         return (1);
3577                 }
3578                 m_copydata(control, off, sizeof(cmh), (caddr_t)&cmh);
3579                 if (cmh.cmsg_len < CMSG_ALIGN(sizeof(cmh))) {
3580                         /* We dont't have a complete CMSG header. */
3581                         *error = EINVAL;
3582                         return (1);
3583                 }
3584                 if ((cmh.cmsg_len > INT_MAX) || ((int)cmh.cmsg_len > rem_len)) {
3585                         /* We don't have the complete CMSG. */
3586                         *error = EINVAL;
3587                         return (1);
3588                 }
3589                 cmsg_data_len = (int)cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh));
3590                 cmsg_data_off = off + CMSG_ALIGN(sizeof(cmh));
3591                 if (cmh.cmsg_level == IPPROTO_SCTP) {
3592                         switch (cmh.cmsg_type) {
3593                         case SCTP_INIT:
3594                                 if (cmsg_data_len < (int)sizeof(struct sctp_initmsg)) {
3595                                         *error = EINVAL;
3596                                         return (1);
3597                                 }
3598                                 m_copydata(control, cmsg_data_off, sizeof(struct sctp_initmsg), (caddr_t)&initmsg);
3599                                 if (initmsg.sinit_max_attempts)
3600                                         stcb->asoc.max_init_times = initmsg.sinit_max_attempts;
3601                                 if (initmsg.sinit_num_ostreams)
3602                                         stcb->asoc.pre_open_streams = initmsg.sinit_num_ostreams;
3603                                 if (initmsg.sinit_max_instreams)
3604                                         stcb->asoc.max_inbound_streams = initmsg.sinit_max_instreams;
3605                                 if (initmsg.sinit_max_init_timeo)
3606                                         stcb->asoc.initial_init_rto_max = initmsg.sinit_max_init_timeo;
3607                                 if (stcb->asoc.streamoutcnt < stcb->asoc.pre_open_streams) {
3608                                         struct sctp_stream_out *tmp_str;
3609                                         unsigned int i;
3610 #if defined(SCTP_DETAILED_STR_STATS)
3611                                         int j;
3612 #endif
3613
3614                                         /* Default is NOT correct */
3615                                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Ok, default:%d pre_open:%d\n",
3616                                             stcb->asoc.streamoutcnt, stcb->asoc.pre_open_streams);
3617                                         SCTP_TCB_UNLOCK(stcb);
3618                                         SCTP_MALLOC(tmp_str,
3619                                             struct sctp_stream_out *,
3620                                             (stcb->asoc.pre_open_streams * sizeof(struct sctp_stream_out)),
3621                                             SCTP_M_STRMO);
3622                                         SCTP_TCB_LOCK(stcb);
3623                                         if (tmp_str != NULL) {
3624                                                 SCTP_FREE(stcb->asoc.strmout, SCTP_M_STRMO);
3625                                                 stcb->asoc.strmout = tmp_str;
3626                                                 stcb->asoc.strm_realoutsize = stcb->asoc.streamoutcnt = stcb->asoc.pre_open_streams;
3627                                         } else {
3628                                                 stcb->asoc.pre_open_streams = stcb->asoc.streamoutcnt;
3629                                         }
3630                                         for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
3631                                                 TAILQ_INIT(&stcb->asoc.strmout[i].outqueue);
3632                                                 stcb->asoc.ss_functions.sctp_ss_init_stream(stcb, &stcb->asoc.strmout[i], NULL);
3633                                                 stcb->asoc.strmout[i].chunks_on_queues = 0;
3634 #if defined(SCTP_DETAILED_STR_STATS)
3635                                                 for (j = 0; j < SCTP_PR_SCTP_MAX + 1; j++) {
3636                                                         stcb->asoc.strmout[i].abandoned_sent[j] = 0;
3637                                                         stcb->asoc.strmout[i].abandoned_unsent[j] = 0;
3638                                                 }
3639 #else
3640                                                 stcb->asoc.strmout[i].abandoned_sent[0] = 0;
3641                                                 stcb->asoc.strmout[i].abandoned_unsent[0] = 0;
3642 #endif
3643                                                 stcb->asoc.strmout[i].next_mid_ordered = 0;
3644                                                 stcb->asoc.strmout[i].next_mid_unordered = 0;
3645                                                 stcb->asoc.strmout[i].sid = i;
3646                                                 stcb->asoc.strmout[i].last_msg_incomplete = 0;
3647                                                 stcb->asoc.strmout[i].state = SCTP_STREAM_OPENING;
3648                                         }
3649                                 }
3650                                 break;
3651 #ifdef INET
3652                         case SCTP_DSTADDRV4:
3653                                 if (cmsg_data_len < (int)sizeof(struct in_addr)) {
3654                                         *error = EINVAL;
3655                                         return (1);
3656                                 }
3657                                 memset(&sin, 0, sizeof(struct sockaddr_in));
3658                                 sin.sin_family = AF_INET;
3659                                 sin.sin_len = sizeof(struct sockaddr_in);
3660                                 sin.sin_port = stcb->rport;
3661                                 m_copydata(control, cmsg_data_off, sizeof(struct in_addr), (caddr_t)&sin.sin_addr);
3662                                 if ((sin.sin_addr.s_addr == INADDR_ANY) ||
3663                                     (sin.sin_addr.s_addr == INADDR_BROADCAST) ||
3664                                     IN_MULTICAST(ntohl(sin.sin_addr.s_addr))) {
3665                                         *error = EINVAL;
3666                                         return (1);
3667                                 }
3668                                 if (sctp_add_remote_addr(stcb, (struct sockaddr *)&sin, NULL, stcb->asoc.port,
3669                                     SCTP_DONOT_SETSCOPE, SCTP_ADDR_IS_CONFIRMED)) {
3670                                         *error = ENOBUFS;
3671                                         return (1);
3672                                 }
3673                                 break;
3674 #endif
3675 #ifdef INET6
3676                         case SCTP_DSTADDRV6:
3677                                 if (cmsg_data_len < (int)sizeof(struct in6_addr)) {
3678                                         *error = EINVAL;
3679                                         return (1);
3680                                 }
3681                                 memset(&sin6, 0, sizeof(struct sockaddr_in6));
3682                                 sin6.sin6_family = AF_INET6;
3683                                 sin6.sin6_len = sizeof(struct sockaddr_in6);
3684                                 sin6.sin6_port = stcb->rport;
3685                                 m_copydata(control, cmsg_data_off, sizeof(struct in6_addr), (caddr_t)&sin6.sin6_addr);
3686                                 if (IN6_IS_ADDR_UNSPECIFIED(&sin6.sin6_addr) ||
3687                                     IN6_IS_ADDR_MULTICAST(&sin6.sin6_addr)) {
3688                                         *error = EINVAL;
3689                                         return (1);
3690                                 }
3691 #ifdef INET
3692                                 if (IN6_IS_ADDR_V4MAPPED(&sin6.sin6_addr)) {
3693                                         in6_sin6_2_sin(&sin, &sin6);
3694                                         if ((sin.sin_addr.s_addr == INADDR_ANY) ||
3695                                             (sin.sin_addr.s_addr == INADDR_BROADCAST) ||
3696                                             IN_MULTICAST(ntohl(sin.sin_addr.s_addr))) {
3697                                                 *error = EINVAL;
3698                                                 return (1);
3699                                         }
3700                                         if (sctp_add_remote_addr(stcb, (struct sockaddr *)&sin, NULL, stcb->asoc.port,
3701                                             SCTP_DONOT_SETSCOPE, SCTP_ADDR_IS_CONFIRMED)) {
3702                                                 *error = ENOBUFS;
3703                                                 return (1);
3704                                         }
3705                                 } else
3706 #endif
3707                                         if (sctp_add_remote_addr(stcb, (struct sockaddr *)&sin6, NULL, stcb->asoc.port,
3708                                     SCTP_DONOT_SETSCOPE, SCTP_ADDR_IS_CONFIRMED)) {
3709                                         *error = ENOBUFS;
3710                                         return (1);
3711                                 }
3712                                 break;
3713 #endif
3714                         default:
3715                                 break;
3716                         }
3717                 }
3718         }
3719         return (0);
3720 }
3721
3722 #if defined(INET) || defined(INET6)
3723 static struct sctp_tcb *
3724 sctp_findassociation_cmsgs(struct sctp_inpcb **inp_p,
3725     uint16_t port,
3726     struct mbuf *control,
3727     struct sctp_nets **net_p,
3728     int *error)
3729 {
3730         struct cmsghdr cmh;
3731         struct sctp_tcb *stcb;
3732         struct sockaddr *addr;
3733 #ifdef INET
3734         struct sockaddr_in sin;
3735 #endif
3736 #ifdef INET6
3737         struct sockaddr_in6 sin6;
3738 #endif
3739         int tot_len, rem_len, cmsg_data_len, cmsg_data_off, off;
3740
3741         tot_len = SCTP_BUF_LEN(control);
3742         for (off = 0; off < tot_len; off += CMSG_ALIGN(cmh.cmsg_len)) {
3743                 rem_len = tot_len - off;
3744                 if (rem_len < (int)CMSG_ALIGN(sizeof(cmh))) {
3745                         /* There is not enough room for one more. */
3746                         *error = EINVAL;
3747                         return (NULL);
3748                 }
3749                 m_copydata(control, off, sizeof(cmh), (caddr_t)&cmh);
3750                 if (cmh.cmsg_len < CMSG_ALIGN(sizeof(cmh))) {
3751                         /* We dont't have a complete CMSG header. */
3752                         *error = EINVAL;
3753                         return (NULL);
3754                 }
3755                 if ((cmh.cmsg_len > INT_MAX) || ((int)cmh.cmsg_len > rem_len)) {
3756                         /* We don't have the complete CMSG. */
3757                         *error = EINVAL;
3758                         return (NULL);
3759                 }
3760                 cmsg_data_len = (int)cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh));
3761                 cmsg_data_off = off + CMSG_ALIGN(sizeof(cmh));
3762                 if (cmh.cmsg_level == IPPROTO_SCTP) {
3763                         switch (cmh.cmsg_type) {
3764 #ifdef INET
3765                         case SCTP_DSTADDRV4:
3766                                 if (cmsg_data_len < (int)sizeof(struct in_addr)) {
3767                                         *error = EINVAL;
3768                                         return (NULL);
3769                                 }
3770                                 memset(&sin, 0, sizeof(struct sockaddr_in));
3771                                 sin.sin_family = AF_INET;
3772                                 sin.sin_len = sizeof(struct sockaddr_in);
3773                                 sin.sin_port = port;
3774                                 m_copydata(control, cmsg_data_off, sizeof(struct in_addr), (caddr_t)&sin.sin_addr);
3775                                 addr = (struct sockaddr *)&sin;
3776                                 break;
3777 #endif
3778 #ifdef INET6
3779                         case SCTP_DSTADDRV6:
3780                                 if (cmsg_data_len < (int)sizeof(struct in6_addr)) {
3781                                         *error = EINVAL;
3782                                         return (NULL);
3783                                 }
3784                                 memset(&sin6, 0, sizeof(struct sockaddr_in6));
3785                                 sin6.sin6_family = AF_INET6;
3786                                 sin6.sin6_len = sizeof(struct sockaddr_in6);
3787                                 sin6.sin6_port = port;
3788                                 m_copydata(control, cmsg_data_off, sizeof(struct in6_addr), (caddr_t)&sin6.sin6_addr);
3789 #ifdef INET
3790                                 if (IN6_IS_ADDR_V4MAPPED(&sin6.sin6_addr)) {
3791                                         in6_sin6_2_sin(&sin, &sin6);
3792                                         addr = (struct sockaddr *)&sin;
3793                                 } else
3794 #endif
3795                                         addr = (struct sockaddr *)&sin6;
3796                                 break;
3797 #endif
3798                         default:
3799                                 addr = NULL;
3800                                 break;
3801                         }
3802                         if (addr) {
3803                                 stcb = sctp_findassociation_ep_addr(inp_p, addr, net_p, NULL, NULL);
3804                                 if (stcb != NULL) {
3805                                         return (stcb);
3806                                 }
3807                         }
3808                 }
3809         }
3810         return (NULL);
3811 }
3812 #endif
3813
3814 static struct mbuf *
3815 sctp_add_cookie(struct mbuf *init, int init_offset,
3816     struct mbuf *initack, int initack_offset, struct sctp_state_cookie *stc_in, uint8_t **signature)
3817 {
3818         struct mbuf *copy_init, *copy_initack, *m_at, *sig, *mret;
3819         struct sctp_state_cookie *stc;
3820         struct sctp_paramhdr *ph;
3821         uint16_t cookie_sz;
3822
3823         mret = sctp_get_mbuf_for_msg((sizeof(struct sctp_state_cookie) +
3824             sizeof(struct sctp_paramhdr)), 0,
3825             M_NOWAIT, 1, MT_DATA);
3826         if (mret == NULL) {
3827                 return (NULL);
3828         }
3829         copy_init = SCTP_M_COPYM(init, init_offset, M_COPYALL, M_NOWAIT);
3830         if (copy_init == NULL) {
3831                 sctp_m_freem(mret);
3832                 return (NULL);
3833         }
3834 #ifdef SCTP_MBUF_LOGGING
3835         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
3836                 sctp_log_mbc(copy_init, SCTP_MBUF_ICOPY);
3837         }
3838 #endif
3839         copy_initack = SCTP_M_COPYM(initack, initack_offset, M_COPYALL,
3840             M_NOWAIT);
3841         if (copy_initack == NULL) {
3842                 sctp_m_freem(mret);
3843                 sctp_m_freem(copy_init);
3844                 return (NULL);
3845         }
3846 #ifdef SCTP_MBUF_LOGGING
3847         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
3848                 sctp_log_mbc(copy_initack, SCTP_MBUF_ICOPY);
3849         }
3850 #endif
3851         /* easy side we just drop it on the end */
3852         ph = mtod(mret, struct sctp_paramhdr *);
3853         SCTP_BUF_LEN(mret) = sizeof(struct sctp_state_cookie) +
3854             sizeof(struct sctp_paramhdr);
3855         stc = (struct sctp_state_cookie *)((caddr_t)ph +
3856             sizeof(struct sctp_paramhdr));
3857         ph->param_type = htons(SCTP_STATE_COOKIE);
3858         ph->param_length = 0;   /* fill in at the end */
3859         /* Fill in the stc cookie data */
3860         memcpy(stc, stc_in, sizeof(struct sctp_state_cookie));
3861
3862         /* tack the INIT and then the INIT-ACK onto the chain */
3863         cookie_sz = 0;
3864         for (m_at = mret; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
3865                 cookie_sz += SCTP_BUF_LEN(m_at);
3866                 if (SCTP_BUF_NEXT(m_at) == NULL) {
3867                         SCTP_BUF_NEXT(m_at) = copy_init;
3868                         break;
3869                 }
3870         }
3871         for (m_at = copy_init; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
3872                 cookie_sz += SCTP_BUF_LEN(m_at);
3873                 if (SCTP_BUF_NEXT(m_at) == NULL) {
3874                         SCTP_BUF_NEXT(m_at) = copy_initack;
3875                         break;
3876                 }
3877         }
3878         for (m_at = copy_initack; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
3879                 cookie_sz += SCTP_BUF_LEN(m_at);
3880                 if (SCTP_BUF_NEXT(m_at) == NULL) {
3881                         break;
3882                 }
3883         }
3884         sig = sctp_get_mbuf_for_msg(SCTP_SIGNATURE_SIZE, 0, M_NOWAIT, 1, MT_DATA);
3885         if (sig == NULL) {
3886                 /* no space, so free the entire chain */
3887                 sctp_m_freem(mret);
3888                 return (NULL);
3889         }
3890         SCTP_BUF_NEXT(m_at) = sig;
3891         SCTP_BUF_LEN(sig) = SCTP_SIGNATURE_SIZE;
3892         cookie_sz += SCTP_SIGNATURE_SIZE;
3893         ph->param_length = htons(cookie_sz);
3894         *signature = (uint8_t *)mtod(sig, caddr_t);
3895         memset(*signature, 0, SCTP_SIGNATURE_SIZE);
3896         return (mret);
3897 }
3898
3899 static uint8_t
3900 sctp_get_ect(struct sctp_tcb *stcb)
3901 {
3902         if ((stcb != NULL) && (stcb->asoc.ecn_supported == 1)) {
3903                 return (SCTP_ECT0_BIT);
3904         } else {
3905                 return (0);
3906         }
3907 }
3908
3909 #if defined(INET) || defined(INET6)
3910 static void
3911 sctp_handle_no_route(struct sctp_tcb *stcb,
3912     struct sctp_nets *net,
3913     int so_locked)
3914 {
3915         SCTPDBG(SCTP_DEBUG_OUTPUT1, "dropped packet - no valid source addr\n");
3916
3917         if (net) {
3918                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Destination was ");
3919                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT1, &net->ro._l_addr.sa);
3920                 if (net->dest_state & SCTP_ADDR_CONFIRMED) {
3921                         if ((net->dest_state & SCTP_ADDR_REACHABLE) && stcb) {
3922                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "no route takes interface %p down\n", (void *)net);
3923                                 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_DOWN,
3924                                     stcb, 0,
3925                                     (void *)net,
3926                                     so_locked);
3927                                 net->dest_state &= ~SCTP_ADDR_REACHABLE;
3928                                 net->dest_state &= ~SCTP_ADDR_PF;
3929                         }
3930                 }
3931                 if (stcb) {
3932                         if (net == stcb->asoc.primary_destination) {
3933                                 /* need a new primary */
3934                                 struct sctp_nets *alt;
3935
3936                                 alt = sctp_find_alternate_net(stcb, net, 0);
3937                                 if (alt != net) {
3938                                         if (stcb->asoc.alternate) {
3939                                                 sctp_free_remote_addr(stcb->asoc.alternate);
3940                                         }
3941                                         stcb->asoc.alternate = alt;
3942                                         atomic_add_int(&stcb->asoc.alternate->ref_count, 1);
3943                                         if (net->ro._s_addr) {
3944                                                 sctp_free_ifa(net->ro._s_addr);
3945                                                 net->ro._s_addr = NULL;
3946                                         }
3947                                         net->src_addr_selected = 0;
3948                                 }
3949                         }
3950                 }
3951         }
3952 }
3953 #endif
3954
3955 static int
3956 sctp_lowlevel_chunk_output(struct sctp_inpcb *inp,
3957     struct sctp_tcb *stcb,      /* may be NULL */
3958     struct sctp_nets *net,
3959     struct sockaddr *to,
3960     struct mbuf *m,
3961     uint32_t auth_offset,
3962     struct sctp_auth_chunk *auth,
3963     uint16_t auth_keyid,
3964     int nofragment_flag,
3965     int ecn_ok,
3966     int out_of_asoc_ok,
3967     uint16_t src_port,
3968     uint16_t dest_port,
3969     uint32_t v_tag,
3970     uint16_t port,
3971     union sctp_sockstore *over_addr,
3972     uint8_t mflowtype, uint32_t mflowid,
3973     int so_locked)
3974 {
3975 /* nofragment_flag to tell if IP_DF should be set (IPv4 only) */
3976         /**
3977          * Given a mbuf chain (via SCTP_BUF_NEXT()) that holds a packet header
3978          * WITH an SCTPHDR but no IP header, endpoint inp and sa structure:
3979          * - fill in the HMAC digest of any AUTH chunk in the packet.
3980          * - calculate and fill in the SCTP checksum.
3981          * - prepend an IP address header.
3982          * - if boundall use INADDR_ANY.
3983          * - if boundspecific do source address selection.
3984          * - set fragmentation option for ipV4.
3985          * - On return from IP output, check/adjust mtu size of output
3986          *   interface and smallest_mtu size as well.
3987          */
3988         /* Will need ifdefs around this */
3989         struct mbuf *newm;
3990         struct sctphdr *sctphdr;
3991         int packet_length;
3992         int ret;
3993 #if defined(INET) || defined(INET6)
3994         uint32_t vrf_id;
3995 #endif
3996 #if defined(INET) || defined(INET6)
3997         struct mbuf *o_pak;
3998         sctp_route_t *ro = NULL;
3999         struct udphdr *udp = NULL;
4000 #endif
4001         uint8_t tos_value;
4002
4003         if ((net) && (net->dest_state & SCTP_ADDR_OUT_OF_SCOPE)) {
4004                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EFAULT);
4005                 sctp_m_freem(m);
4006                 return (EFAULT);
4007         }
4008 #if defined(INET) || defined(INET6)
4009         if (stcb) {
4010                 vrf_id = stcb->asoc.vrf_id;
4011         } else {
4012                 vrf_id = inp->def_vrf_id;
4013         }
4014 #endif
4015         /* fill in the HMAC digest for any AUTH chunk in the packet */
4016         if ((auth != NULL) && (stcb != NULL)) {
4017                 sctp_fill_hmac_digest_m(m, auth_offset, auth, stcb, auth_keyid);
4018         }
4019
4020         if (net) {
4021                 tos_value = net->dscp;
4022         } else if (stcb) {
4023                 tos_value = stcb->asoc.default_dscp;
4024         } else {
4025                 tos_value = inp->sctp_ep.default_dscp;
4026         }
4027
4028         switch (to->sa_family) {
4029 #ifdef INET
4030         case AF_INET:
4031                 {
4032                         struct ip *ip = NULL;
4033                         sctp_route_t iproute;
4034                         int len;
4035
4036                         len = SCTP_MIN_V4_OVERHEAD;
4037                         if (port) {
4038                                 len += sizeof(struct udphdr);
4039                         }
4040                         newm = sctp_get_mbuf_for_msg(len, 1, M_NOWAIT, 1, MT_DATA);
4041                         if (newm == NULL) {
4042                                 sctp_m_freem(m);
4043                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
4044                                 return (ENOMEM);
4045                         }
4046                         SCTP_ALIGN_TO_END(newm, len);
4047                         SCTP_BUF_LEN(newm) = len;
4048                         SCTP_BUF_NEXT(newm) = m;
4049                         m = newm;
4050                         if (net != NULL) {
4051                                 m->m_pkthdr.flowid = net->flowid;
4052                                 M_HASHTYPE_SET(m, net->flowtype);
4053                         } else {
4054                                 m->m_pkthdr.flowid = mflowid;
4055                                 M_HASHTYPE_SET(m, mflowtype);
4056                         }
4057                         packet_length = sctp_calculate_len(m);
4058                         ip = mtod(m, struct ip *);
4059                         ip->ip_v = IPVERSION;
4060                         ip->ip_hl = (sizeof(struct ip) >> 2);
4061                         if (tos_value == 0) {
4062                                 /*
4063                                  * This means especially, that it is not set
4064                                  * at the SCTP layer. So use the value from
4065                                  * the IP layer.
4066                                  */
4067                                 tos_value = inp->ip_inp.inp.inp_ip_tos;
4068                         }
4069                         tos_value &= 0xfc;
4070                         if (ecn_ok) {
4071                                 tos_value |= sctp_get_ect(stcb);
4072                         }
4073                         if ((nofragment_flag) && (port == 0)) {
4074                                 ip->ip_off = htons(IP_DF);
4075                         } else {
4076                                 ip->ip_off = htons(0);
4077                         }
4078                         /* FreeBSD has a function for ip_id's */
4079                         ip_fillid(ip);
4080
4081                         ip->ip_ttl = inp->ip_inp.inp.inp_ip_ttl;
4082                         ip->ip_len = htons(packet_length);
4083                         ip->ip_tos = tos_value;
4084                         if (port) {
4085                                 ip->ip_p = IPPROTO_UDP;
4086                         } else {
4087                                 ip->ip_p = IPPROTO_SCTP;
4088                         }
4089                         ip->ip_sum = 0;
4090                         if (net == NULL) {
4091                                 ro = &iproute;
4092                                 memset(&iproute, 0, sizeof(iproute));
4093                                 memcpy(&ro->ro_dst, to, to->sa_len);
4094                         } else {
4095                                 ro = (sctp_route_t *)&net->ro;
4096                         }
4097                         /* Now the address selection part */
4098                         ip->ip_dst.s_addr = ((struct sockaddr_in *)to)->sin_addr.s_addr;
4099
4100                         /* call the routine to select the src address */
4101                         if (net && out_of_asoc_ok == 0) {
4102                                 if (net->ro._s_addr && (net->ro._s_addr->localifa_flags & (SCTP_BEING_DELETED | SCTP_ADDR_IFA_UNUSEABLE))) {
4103                                         sctp_free_ifa(net->ro._s_addr);
4104                                         net->ro._s_addr = NULL;
4105                                         net->src_addr_selected = 0;
4106                                         RO_NHFREE(ro);
4107                                 }
4108                                 if (net->src_addr_selected == 0) {
4109                                         /* Cache the source address */
4110                                         net->ro._s_addr = sctp_source_address_selection(inp, stcb,
4111                                             ro, net, 0,
4112                                             vrf_id);
4113                                         net->src_addr_selected = 1;
4114                                 }
4115                                 if (net->ro._s_addr == NULL) {
4116                                         /* No route to host */
4117                                         net->src_addr_selected = 0;
4118                                         sctp_handle_no_route(stcb, net, so_locked);
4119                                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4120                                         sctp_m_freem(m);
4121                                         return (EHOSTUNREACH);
4122                                 }
4123                                 ip->ip_src = net->ro._s_addr->address.sin.sin_addr;
4124                         } else {
4125                                 if (over_addr == NULL) {
4126                                         struct sctp_ifa *_lsrc;
4127
4128                                         _lsrc = sctp_source_address_selection(inp, stcb, ro,
4129                                             net,
4130                                             out_of_asoc_ok,
4131                                             vrf_id);
4132                                         if (_lsrc == NULL) {
4133                                                 sctp_handle_no_route(stcb, net, so_locked);
4134                                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4135                                                 sctp_m_freem(m);
4136                                                 return (EHOSTUNREACH);
4137                                         }
4138                                         ip->ip_src = _lsrc->address.sin.sin_addr;
4139                                         sctp_free_ifa(_lsrc);
4140                                 } else {
4141                                         ip->ip_src = over_addr->sin.sin_addr;
4142                                         SCTP_RTALLOC(ro, vrf_id, inp->fibnum);
4143                                 }
4144                         }
4145                         if (port) {
4146                                 if (htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port)) == 0) {
4147                                         sctp_handle_no_route(stcb, net, so_locked);
4148                                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4149                                         sctp_m_freem(m);
4150                                         return (EHOSTUNREACH);
4151                                 }
4152                                 udp = (struct udphdr *)((caddr_t)ip + sizeof(struct ip));
4153                                 udp->uh_sport = htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port));
4154                                 udp->uh_dport = port;
4155                                 udp->uh_ulen = htons((uint16_t)(packet_length - sizeof(struct ip)));
4156                                 if (V_udp_cksum) {
4157                                         udp->uh_sum = in_pseudo(ip->ip_src.s_addr, ip->ip_dst.s_addr, udp->uh_ulen + htons(IPPROTO_UDP));
4158                                 } else {
4159                                         udp->uh_sum = 0;
4160                                 }
4161                                 sctphdr = (struct sctphdr *)((caddr_t)udp + sizeof(struct udphdr));
4162                         } else {
4163                                 sctphdr = (struct sctphdr *)((caddr_t)ip + sizeof(struct ip));
4164                         }
4165
4166                         sctphdr->src_port = src_port;
4167                         sctphdr->dest_port = dest_port;
4168                         sctphdr->v_tag = v_tag;
4169                         sctphdr->checksum = 0;
4170
4171                         /*
4172                          * If source address selection fails and we find no
4173                          * route then the ip_output should fail as well with
4174                          * a NO_ROUTE_TO_HOST type error. We probably should
4175                          * catch that somewhere and abort the association
4176                          * right away (assuming this is an INIT being sent).
4177                          */
4178                         if (ro->ro_nh == NULL) {
4179                                 /*
4180                                  * src addr selection failed to find a route
4181                                  * (or valid source addr), so we can't get
4182                                  * there from here (yet)!
4183                                  */
4184                                 sctp_handle_no_route(stcb, net, so_locked);
4185                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4186                                 sctp_m_freem(m);
4187                                 return (EHOSTUNREACH);
4188                         }
4189                         if (ro != &iproute) {
4190                                 memcpy(&iproute, ro, sizeof(*ro));
4191                         }
4192                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "Calling ipv4 output routine from low level src addr:%x\n",
4193                             (uint32_t)(ntohl(ip->ip_src.s_addr)));
4194                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "Destination is %x\n",
4195                             (uint32_t)(ntohl(ip->ip_dst.s_addr)));
4196                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "RTP route is %p through\n",
4197                             (void *)ro->ro_nh);
4198
4199                         if (SCTP_GET_HEADER_FOR_OUTPUT(o_pak)) {
4200                                 /* failed to prepend data, give up */
4201                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
4202                                 sctp_m_freem(m);
4203                                 return (ENOMEM);
4204                         }
4205                         SCTP_ATTACH_CHAIN(o_pak, m, packet_length);
4206                         if (port) {
4207                                 sctphdr->checksum = sctp_calculate_cksum(m, sizeof(struct ip) + sizeof(struct udphdr));
4208                                 SCTP_STAT_INCR(sctps_sendswcrc);
4209                                 if (V_udp_cksum) {
4210                                         SCTP_ENABLE_UDP_CSUM(o_pak);
4211                                 }
4212                         } else {
4213                                 m->m_pkthdr.csum_flags = CSUM_SCTP;
4214                                 m->m_pkthdr.csum_data = offsetof(struct sctphdr, checksum);
4215                                 SCTP_STAT_INCR(sctps_sendhwcrc);
4216                         }
4217 #ifdef SCTP_PACKET_LOGGING
4218                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING)
4219                                 sctp_packet_log(o_pak);
4220 #endif
4221                         /* send it out.  table id is taken from stcb */
4222                         SCTP_PROBE5(send, NULL, stcb, ip, stcb, sctphdr);
4223                         SCTP_IP_OUTPUT(ret, o_pak, ro, stcb, vrf_id);
4224                         if (port) {
4225                                 UDPSTAT_INC(udps_opackets);
4226                         }
4227                         SCTP_STAT_INCR(sctps_sendpackets);
4228                         SCTP_STAT_INCR_COUNTER64(sctps_outpackets);
4229                         if (ret)
4230                                 SCTP_STAT_INCR(sctps_senderrors);
4231
4232                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "IP output returns %d\n", ret);
4233                         if (net == NULL) {
4234                                 /* free tempy routes */
4235                                 RO_NHFREE(ro);
4236                         } else {
4237                                 if ((ro->ro_nh != NULL) && (net->ro._s_addr) &&
4238                                     ((net->dest_state & SCTP_ADDR_NO_PMTUD) == 0)) {
4239                                         uint32_t mtu;
4240
4241                                         mtu = SCTP_GATHER_MTU_FROM_ROUTE(net->ro._s_addr, &net->ro._l_addr.sa, ro->ro_nh);
4242                                         if (mtu > 0) {
4243                                                 if (net->port) {
4244                                                         mtu -= sizeof(struct udphdr);
4245                                                 }
4246                                                 if (mtu < net->mtu) {
4247                                                         if ((stcb != NULL) && (stcb->asoc.smallest_mtu > mtu)) {
4248                                                                 sctp_mtu_size_reset(inp, &stcb->asoc, mtu);
4249                                                         }
4250                                                         net->mtu = mtu;
4251                                                 }
4252                                         }
4253                                 } else if (ro->ro_nh == NULL) {
4254                                         /* route was freed */
4255                                         if (net->ro._s_addr &&
4256                                             net->src_addr_selected) {
4257                                                 sctp_free_ifa(net->ro._s_addr);
4258                                                 net->ro._s_addr = NULL;
4259                                         }
4260                                         net->src_addr_selected = 0;
4261                                 }
4262                         }
4263                         return (ret);
4264                 }
4265 #endif
4266 #ifdef INET6
4267         case AF_INET6:
4268                 {
4269                         uint32_t flowlabel, flowinfo;
4270                         struct ip6_hdr *ip6h;
4271                         struct route_in6 ip6route;
4272                         struct ifnet *ifp;
4273                         struct sockaddr_in6 *sin6, tmp, *lsa6, lsa6_tmp;
4274                         int prev_scope = 0;
4275                         struct sockaddr_in6 lsa6_storage;
4276                         int error;
4277                         u_short prev_port = 0;
4278                         int len;
4279
4280                         if (net) {
4281                                 flowlabel = net->flowlabel;
4282                         } else if (stcb) {
4283                                 flowlabel = stcb->asoc.default_flowlabel;
4284                         } else {
4285                                 flowlabel = inp->sctp_ep.default_flowlabel;
4286                         }
4287                         if (flowlabel == 0) {
4288                                 /*
4289                                  * This means especially, that it is not set
4290                                  * at the SCTP layer. So use the value from
4291                                  * the IP layer.
4292                                  */
4293                                 flowlabel = ntohl(((struct inpcb *)inp)->inp_flow);
4294                         }
4295                         flowlabel &= 0x000fffff;
4296                         len = SCTP_MIN_OVERHEAD;
4297                         if (port) {
4298                                 len += sizeof(struct udphdr);
4299                         }
4300                         newm = sctp_get_mbuf_for_msg(len, 1, M_NOWAIT, 1, MT_DATA);
4301                         if (newm == NULL) {
4302                                 sctp_m_freem(m);
4303                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
4304                                 return (ENOMEM);
4305                         }
4306                         SCTP_ALIGN_TO_END(newm, len);
4307                         SCTP_BUF_LEN(newm) = len;
4308                         SCTP_BUF_NEXT(newm) = m;
4309                         m = newm;
4310                         if (net != NULL) {
4311                                 m->m_pkthdr.flowid = net->flowid;
4312                                 M_HASHTYPE_SET(m, net->flowtype);
4313                         } else {
4314                                 m->m_pkthdr.flowid = mflowid;
4315                                 M_HASHTYPE_SET(m, mflowtype);
4316                         }
4317                         packet_length = sctp_calculate_len(m);
4318
4319                         ip6h = mtod(m, struct ip6_hdr *);
4320                         /* protect *sin6 from overwrite */
4321                         sin6 = (struct sockaddr_in6 *)to;
4322                         tmp = *sin6;
4323                         sin6 = &tmp;
4324
4325                         /* KAME hack: embed scopeid */
4326                         if (sa6_embedscope(sin6, MODULE_GLOBAL(ip6_use_defzone)) != 0) {
4327                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
4328                                 sctp_m_freem(m);
4329                                 return (EINVAL);
4330                         }
4331                         if (net == NULL) {
4332                                 memset(&ip6route, 0, sizeof(ip6route));
4333                                 ro = (sctp_route_t *)&ip6route;
4334                                 memcpy(&ro->ro_dst, sin6, sin6->sin6_len);
4335                         } else {
4336                                 ro = (sctp_route_t *)&net->ro;
4337                         }
4338                         /*
4339                          * We assume here that inp_flow is in host byte
4340                          * order within the TCB!
4341                          */
4342                         if (tos_value == 0) {
4343                                 /*
4344                                  * This means especially, that it is not set
4345                                  * at the SCTP layer. So use the value from
4346                                  * the IP layer.
4347                                  */
4348                                 tos_value = (ntohl(((struct inpcb *)inp)->inp_flow) >> 20) & 0xff;
4349                         }
4350                         tos_value &= 0xfc;
4351                         if (ecn_ok) {
4352                                 tos_value |= sctp_get_ect(stcb);
4353                         }
4354                         flowinfo = 0x06;
4355                         flowinfo <<= 8;
4356                         flowinfo |= tos_value;
4357                         flowinfo <<= 20;
4358                         flowinfo |= flowlabel;
4359                         ip6h->ip6_flow = htonl(flowinfo);
4360                         if (port) {
4361                                 ip6h->ip6_nxt = IPPROTO_UDP;
4362                         } else {
4363                                 ip6h->ip6_nxt = IPPROTO_SCTP;
4364                         }
4365                         ip6h->ip6_plen = htons((uint16_t)(packet_length - sizeof(struct ip6_hdr)));
4366                         ip6h->ip6_dst = sin6->sin6_addr;
4367
4368                         /*
4369                          * Add SRC address selection here: we can only reuse
4370                          * to a limited degree the kame src-addr-sel, since
4371                          * we can try their selection but it may not be
4372                          * bound.
4373                          */
4374                         memset(&lsa6_tmp, 0, sizeof(lsa6_tmp));
4375                         lsa6_tmp.sin6_family = AF_INET6;
4376                         lsa6_tmp.sin6_len = sizeof(lsa6_tmp);
4377                         lsa6 = &lsa6_tmp;
4378                         if (net && out_of_asoc_ok == 0) {
4379                                 if (net->ro._s_addr && (net->ro._s_addr->localifa_flags & (SCTP_BEING_DELETED | SCTP_ADDR_IFA_UNUSEABLE))) {
4380                                         sctp_free_ifa(net->ro._s_addr);
4381                                         net->ro._s_addr = NULL;
4382                                         net->src_addr_selected = 0;
4383                                         RO_NHFREE(ro);
4384                                 }
4385                                 if (net->src_addr_selected == 0) {
4386                                         sin6 = (struct sockaddr_in6 *)&net->ro._l_addr;
4387                                         /* KAME hack: embed scopeid */
4388                                         if (sa6_embedscope(sin6, MODULE_GLOBAL(ip6_use_defzone)) != 0) {
4389                                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
4390                                                 sctp_m_freem(m);
4391                                                 return (EINVAL);
4392                                         }
4393                                         /* Cache the source address */
4394                                         net->ro._s_addr = sctp_source_address_selection(inp,
4395                                             stcb,
4396                                             ro,
4397                                             net,
4398                                             0,
4399                                             vrf_id);
4400                                         (void)sa6_recoverscope(sin6);
4401                                         net->src_addr_selected = 1;
4402                                 }
4403                                 if (net->ro._s_addr == NULL) {
4404                                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "V6:No route to host\n");
4405                                         net->src_addr_selected = 0;
4406                                         sctp_handle_no_route(stcb, net, so_locked);
4407                                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4408                                         sctp_m_freem(m);
4409                                         return (EHOSTUNREACH);
4410                                 }
4411                                 lsa6->sin6_addr = net->ro._s_addr->address.sin6.sin6_addr;
4412                         } else {
4413                                 sin6 = (struct sockaddr_in6 *)&ro->ro_dst;
4414                                 /* KAME hack: embed scopeid */
4415                                 if (sa6_embedscope(sin6, MODULE_GLOBAL(ip6_use_defzone)) != 0) {
4416                                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
4417                                         sctp_m_freem(m);
4418                                         return (EINVAL);
4419                                 }
4420                                 if (over_addr == NULL) {
4421                                         struct sctp_ifa *_lsrc;
4422
4423                                         _lsrc = sctp_source_address_selection(inp, stcb, ro,
4424                                             net,
4425                                             out_of_asoc_ok,
4426                                             vrf_id);
4427                                         if (_lsrc == NULL) {
4428                                                 sctp_handle_no_route(stcb, net, so_locked);
4429                                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4430                                                 sctp_m_freem(m);
4431                                                 return (EHOSTUNREACH);
4432                                         }
4433                                         lsa6->sin6_addr = _lsrc->address.sin6.sin6_addr;
4434                                         sctp_free_ifa(_lsrc);
4435                                 } else {
4436                                         lsa6->sin6_addr = over_addr->sin6.sin6_addr;
4437                                         SCTP_RTALLOC(ro, vrf_id, inp->fibnum);
4438                                 }
4439                                 (void)sa6_recoverscope(sin6);
4440                         }
4441                         lsa6->sin6_port = inp->sctp_lport;
4442
4443                         if (ro->ro_nh == NULL) {
4444                                 /*
4445                                  * src addr selection failed to find a route
4446                                  * (or valid source addr), so we can't get
4447                                  * there from here!
4448                                  */
4449                                 sctp_handle_no_route(stcb, net, so_locked);
4450                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4451                                 sctp_m_freem(m);
4452                                 return (EHOSTUNREACH);
4453                         }
4454                         /*
4455                          * XXX: sa6 may not have a valid sin6_scope_id in
4456                          * the non-SCOPEDROUTING case.
4457                          */
4458                         memset(&lsa6_storage, 0, sizeof(lsa6_storage));
4459                         lsa6_storage.sin6_family = AF_INET6;
4460                         lsa6_storage.sin6_len = sizeof(lsa6_storage);
4461                         lsa6_storage.sin6_addr = lsa6->sin6_addr;
4462                         if ((error = sa6_recoverscope(&lsa6_storage)) != 0) {
4463                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "recover scope fails error %d\n", error);
4464                                 sctp_m_freem(m);
4465                                 return (error);
4466                         }
4467                         /* XXX */
4468                         lsa6_storage.sin6_addr = lsa6->sin6_addr;
4469                         lsa6_storage.sin6_port = inp->sctp_lport;
4470                         lsa6 = &lsa6_storage;
4471                         ip6h->ip6_src = lsa6->sin6_addr;
4472
4473                         if (port) {
4474                                 if (htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port)) == 0) {
4475                                         sctp_handle_no_route(stcb, net, so_locked);
4476                                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4477                                         sctp_m_freem(m);
4478                                         return (EHOSTUNREACH);
4479                                 }
4480                                 udp = (struct udphdr *)((caddr_t)ip6h + sizeof(struct ip6_hdr));
4481                                 udp->uh_sport = htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port));
4482                                 udp->uh_dport = port;
4483                                 udp->uh_ulen = htons((uint16_t)(packet_length - sizeof(struct ip6_hdr)));
4484                                 udp->uh_sum = 0;
4485                                 sctphdr = (struct sctphdr *)((caddr_t)udp + sizeof(struct udphdr));
4486                         } else {
4487                                 sctphdr = (struct sctphdr *)((caddr_t)ip6h + sizeof(struct ip6_hdr));
4488                         }
4489
4490                         sctphdr->src_port = src_port;
4491                         sctphdr->dest_port = dest_port;
4492                         sctphdr->v_tag = v_tag;
4493                         sctphdr->checksum = 0;
4494
4495                         /*
4496                          * We set the hop limit now since there is a good
4497                          * chance that our ro pointer is now filled
4498                          */
4499                         ip6h->ip6_hlim = SCTP_GET_HLIM(inp, ro);
4500                         ifp = SCTP_GET_IFN_VOID_FROM_ROUTE(ro);
4501
4502 #ifdef SCTP_DEBUG
4503                         /* Copy to be sure something bad is not happening */
4504                         sin6->sin6_addr = ip6h->ip6_dst;
4505                         lsa6->sin6_addr = ip6h->ip6_src;
4506 #endif
4507
4508                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "Calling ipv6 output routine from low level\n");
4509                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "src: ");
4510                         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT3, (struct sockaddr *)lsa6);
4511                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "dst: ");
4512                         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT3, (struct sockaddr *)sin6);
4513                         if (net) {
4514                                 sin6 = (struct sockaddr_in6 *)&net->ro._l_addr;
4515                                 /*
4516                                  * preserve the port and scope for link
4517                                  * local send
4518                                  */
4519                                 prev_scope = sin6->sin6_scope_id;
4520                                 prev_port = sin6->sin6_port;
4521                         }
4522
4523                         if (SCTP_GET_HEADER_FOR_OUTPUT(o_pak)) {
4524                                 /* failed to prepend data, give up */
4525                                 sctp_m_freem(m);
4526                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
4527                                 return (ENOMEM);
4528                         }
4529                         SCTP_ATTACH_CHAIN(o_pak, m, packet_length);
4530                         if (port) {
4531                                 sctphdr->checksum = sctp_calculate_cksum(m, sizeof(struct ip6_hdr) + sizeof(struct udphdr));
4532                                 SCTP_STAT_INCR(sctps_sendswcrc);
4533                                 if ((udp->uh_sum = in6_cksum(o_pak, IPPROTO_UDP, sizeof(struct ip6_hdr), packet_length - sizeof(struct ip6_hdr))) == 0) {
4534                                         udp->uh_sum = 0xffff;
4535                                 }
4536                         } else {
4537                                 m->m_pkthdr.csum_flags = CSUM_SCTP_IPV6;
4538                                 m->m_pkthdr.csum_data = offsetof(struct sctphdr, checksum);
4539                                 SCTP_STAT_INCR(sctps_sendhwcrc);
4540                         }
4541                         /* send it out. table id is taken from stcb */
4542 #ifdef SCTP_PACKET_LOGGING
4543                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING)
4544                                 sctp_packet_log(o_pak);
4545 #endif
4546                         SCTP_PROBE5(send, NULL, stcb, ip6h, stcb, sctphdr);
4547                         SCTP_IP6_OUTPUT(ret, o_pak, (struct route_in6 *)ro, &ifp, stcb, vrf_id);
4548                         if (net) {
4549                                 /* for link local this must be done */
4550                                 sin6->sin6_scope_id = prev_scope;
4551                                 sin6->sin6_port = prev_port;
4552                         }
4553                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "return from send is %d\n", ret);
4554                         if (port) {
4555                                 UDPSTAT_INC(udps_opackets);
4556                         }
4557                         SCTP_STAT_INCR(sctps_sendpackets);
4558                         SCTP_STAT_INCR_COUNTER64(sctps_outpackets);
4559                         if (ret) {
4560                                 SCTP_STAT_INCR(sctps_senderrors);
4561                         }
4562                         if (net == NULL) {
4563                                 /* Now if we had a temp route free it */
4564                                 RO_NHFREE(ro);
4565                         } else {
4566                                 /*
4567                                  * PMTU check versus smallest asoc MTU goes
4568                                  * here
4569                                  */
4570                                 if (ro->ro_nh == NULL) {
4571                                         /* Route was freed */
4572                                         if (net->ro._s_addr &&
4573                                             net->src_addr_selected) {
4574                                                 sctp_free_ifa(net->ro._s_addr);
4575                                                 net->ro._s_addr = NULL;
4576                                         }
4577                                         net->src_addr_selected = 0;
4578                                 }
4579                                 if ((ro->ro_nh != NULL) && (net->ro._s_addr) &&
4580                                     ((net->dest_state & SCTP_ADDR_NO_PMTUD) == 0)) {
4581                                         uint32_t mtu;
4582
4583                                         mtu = SCTP_GATHER_MTU_FROM_ROUTE(net->ro._s_addr, &net->ro._l_addr.sa, ro->ro_nh);
4584                                         if (mtu > 0) {
4585                                                 if (net->port) {
4586                                                         mtu -= sizeof(struct udphdr);
4587                                                 }
4588                                                 if (mtu < net->mtu) {
4589                                                         if ((stcb != NULL) && (stcb->asoc.smallest_mtu > mtu)) {
4590                                                                 sctp_mtu_size_reset(inp, &stcb->asoc, mtu);
4591                                                         }
4592                                                         net->mtu = mtu;
4593                                                 }
4594                                         }
4595                                 } else if (ifp) {
4596                                         if (ND_IFINFO(ifp)->linkmtu &&
4597                                             (stcb->asoc.smallest_mtu > ND_IFINFO(ifp)->linkmtu)) {
4598                                                 sctp_mtu_size_reset(inp,
4599                                                     &stcb->asoc,
4600                                                     ND_IFINFO(ifp)->linkmtu);
4601                                         }
4602                                 }
4603                         }
4604                         return (ret);
4605                 }
4606 #endif
4607         default:
4608                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Unknown protocol (TSNH) type %d\n",
4609                     ((struct sockaddr *)to)->sa_family);
4610                 sctp_m_freem(m);
4611                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EFAULT);
4612                 return (EFAULT);
4613         }
4614 }
4615
4616 void
4617 sctp_send_initiate(struct sctp_inpcb *inp, struct sctp_tcb *stcb, int so_locked)
4618 {
4619         struct mbuf *m, *m_last;
4620         struct sctp_nets *net;
4621         struct sctp_init_chunk *init;
4622         struct sctp_supported_addr_param *sup_addr;
4623         struct sctp_adaptation_layer_indication *ali;
4624         struct sctp_supported_chunk_types_param *pr_supported;
4625         struct sctp_paramhdr *ph;
4626         int cnt_inits_to = 0;
4627         int error;
4628         uint16_t num_ext, chunk_len, padding_len, parameter_len;
4629
4630         /* INIT's always go to the primary (and usually ONLY address) */
4631         net = stcb->asoc.primary_destination;
4632         if (net == NULL) {
4633                 net = TAILQ_FIRST(&stcb->asoc.nets);
4634                 if (net == NULL) {
4635                         /* TSNH */
4636                         return;
4637                 }
4638                 /* we confirm any address we send an INIT to */
4639                 net->dest_state &= ~SCTP_ADDR_UNCONFIRMED;
4640                 (void)sctp_set_primary_addr(stcb, NULL, net);
4641         } else {
4642                 /* we confirm any address we send an INIT to */
4643                 net->dest_state &= ~SCTP_ADDR_UNCONFIRMED;
4644         }
4645         SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT\n");
4646 #ifdef INET6
4647         if (net->ro._l_addr.sa.sa_family == AF_INET6) {
4648                 /*
4649                  * special hook, if we are sending to link local it will not
4650                  * show up in our private address count.
4651                  */
4652                 if (IN6_IS_ADDR_LINKLOCAL(&net->ro._l_addr.sin6.sin6_addr))
4653                         cnt_inits_to = 1;
4654         }
4655 #endif
4656         if (SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
4657                 /* This case should not happen */
4658                 SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT - failed timer?\n");
4659                 return;
4660         }
4661         /* start the INIT timer */
4662         sctp_timer_start(SCTP_TIMER_TYPE_INIT, inp, stcb, net);
4663
4664         m = sctp_get_mbuf_for_msg(MCLBYTES, 1, M_NOWAIT, 1, MT_DATA);
4665         if (m == NULL) {
4666                 /* No memory, INIT timer will re-attempt. */
4667                 SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT - mbuf?\n");
4668                 return;
4669         }
4670         chunk_len = (uint16_t)sizeof(struct sctp_init_chunk);
4671         padding_len = 0;
4672         /* Now lets put the chunk header in place */
4673         init = mtod(m, struct sctp_init_chunk *);
4674         /* now the chunk header */
4675         init->ch.chunk_type = SCTP_INITIATION;
4676         init->ch.chunk_flags = 0;
4677         /* fill in later from mbuf we build */
4678         init->ch.chunk_length = 0;
4679         /* place in my tag */
4680         init->init.initiate_tag = htonl(stcb->asoc.my_vtag);
4681         /* set up some of the credits. */
4682         init->init.a_rwnd = htonl(max(inp->sctp_socket ? SCTP_SB_LIMIT_RCV(inp->sctp_socket) : 0,
4683             SCTP_MINIMAL_RWND));
4684         init->init.num_outbound_streams = htons(stcb->asoc.pre_open_streams);
4685         init->init.num_inbound_streams = htons(stcb->asoc.max_inbound_streams);
4686         init->init.initial_tsn = htonl(stcb->asoc.init_seq_number);
4687
4688         /* Adaptation layer indication parameter */
4689         if (inp->sctp_ep.adaptation_layer_indicator_provided) {
4690                 parameter_len = (uint16_t)sizeof(struct sctp_adaptation_layer_indication);
4691                 ali = (struct sctp_adaptation_layer_indication *)(mtod(m, caddr_t)+chunk_len);
4692                 ali->ph.param_type = htons(SCTP_ULP_ADAPTATION);
4693                 ali->ph.param_length = htons(parameter_len);
4694                 ali->indication = htonl(inp->sctp_ep.adaptation_layer_indicator);
4695                 chunk_len += parameter_len;
4696         }
4697
4698         /* ECN parameter */
4699         if (stcb->asoc.ecn_supported == 1) {
4700                 parameter_len = (uint16_t)sizeof(struct sctp_paramhdr);
4701                 ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
4702                 ph->param_type = htons(SCTP_ECN_CAPABLE);
4703                 ph->param_length = htons(parameter_len);
4704                 chunk_len += parameter_len;
4705         }
4706
4707         /* PR-SCTP supported parameter */
4708         if (stcb->asoc.prsctp_supported == 1) {
4709                 parameter_len = (uint16_t)sizeof(struct sctp_paramhdr);
4710                 ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
4711                 ph->param_type = htons(SCTP_PRSCTP_SUPPORTED);
4712                 ph->param_length = htons(parameter_len);
4713                 chunk_len += parameter_len;
4714         }
4715
4716         /* Add NAT friendly parameter. */
4717         if (SCTP_BASE_SYSCTL(sctp_inits_include_nat_friendly)) {
4718                 parameter_len = (uint16_t)sizeof(struct sctp_paramhdr);
4719                 ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
4720                 ph->param_type = htons(SCTP_HAS_NAT_SUPPORT);
4721                 ph->param_length = htons(parameter_len);
4722                 chunk_len += parameter_len;
4723         }
4724
4725         /* And now tell the peer which extensions we support */
4726         num_ext = 0;
4727         pr_supported = (struct sctp_supported_chunk_types_param *)(mtod(m, caddr_t)+chunk_len);
4728         if (stcb->asoc.prsctp_supported == 1) {
4729                 pr_supported->chunk_types[num_ext++] = SCTP_FORWARD_CUM_TSN;
4730                 if (stcb->asoc.idata_supported) {
4731                         pr_supported->chunk_types[num_ext++] = SCTP_IFORWARD_CUM_TSN;
4732                 }
4733         }
4734         if (stcb->asoc.auth_supported == 1) {
4735                 pr_supported->chunk_types[num_ext++] = SCTP_AUTHENTICATION;
4736         }
4737         if (stcb->asoc.asconf_supported == 1) {
4738                 pr_supported->chunk_types[num_ext++] = SCTP_ASCONF;
4739                 pr_supported->chunk_types[num_ext++] = SCTP_ASCONF_ACK;
4740         }
4741         if (stcb->asoc.reconfig_supported == 1) {
4742                 pr_supported->chunk_types[num_ext++] = SCTP_STREAM_RESET;
4743         }
4744         if (stcb->asoc.idata_supported) {
4745                 pr_supported->chunk_types[num_ext++] = SCTP_IDATA;
4746         }
4747         if (stcb->asoc.nrsack_supported == 1) {
4748                 pr_supported->chunk_types[num_ext++] = SCTP_NR_SELECTIVE_ACK;
4749         }
4750         if (stcb->asoc.pktdrop_supported == 1) {
4751                 pr_supported->chunk_types[num_ext++] = SCTP_PACKET_DROPPED;
4752         }
4753         if (num_ext > 0) {
4754                 parameter_len = (uint16_t)sizeof(struct sctp_supported_chunk_types_param) + num_ext;
4755                 pr_supported->ph.param_type = htons(SCTP_SUPPORTED_CHUNK_EXT);
4756                 pr_supported->ph.param_length = htons(parameter_len);
4757                 padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
4758                 chunk_len += parameter_len;
4759         }
4760         /* add authentication parameters */
4761         if (stcb->asoc.auth_supported) {
4762                 /* attach RANDOM parameter, if available */
4763                 if (stcb->asoc.authinfo.random != NULL) {
4764                         struct sctp_auth_random *randp;
4765
4766                         if (padding_len > 0) {
4767                                 memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
4768                                 chunk_len += padding_len;
4769                                 padding_len = 0;
4770                         }
4771                         randp = (struct sctp_auth_random *)(mtod(m, caddr_t)+chunk_len);
4772                         parameter_len = (uint16_t)sizeof(struct sctp_auth_random) + stcb->asoc.authinfo.random_len;
4773                         /* random key already contains the header */
4774                         memcpy(randp, stcb->asoc.authinfo.random->key, parameter_len);
4775                         padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
4776                         chunk_len += parameter_len;
4777                 }
4778                 /* add HMAC_ALGO parameter */
4779                 if (stcb->asoc.local_hmacs != NULL) {
4780                         struct sctp_auth_hmac_algo *hmacs;
4781
4782                         if (padding_len > 0) {
4783                                 memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
4784                                 chunk_len += padding_len;
4785                                 padding_len = 0;
4786                         }
4787                         hmacs = (struct sctp_auth_hmac_algo *)(mtod(m, caddr_t)+chunk_len);
4788                         parameter_len = (uint16_t)(sizeof(struct sctp_auth_hmac_algo) +
4789                             stcb->asoc.local_hmacs->num_algo * sizeof(uint16_t));
4790                         hmacs->ph.param_type = htons(SCTP_HMAC_LIST);
4791                         hmacs->ph.param_length = htons(parameter_len);
4792                         sctp_serialize_hmaclist(stcb->asoc.local_hmacs, (uint8_t *)hmacs->hmac_ids);
4793                         padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
4794                         chunk_len += parameter_len;
4795                 }
4796                 /* add CHUNKS parameter */
4797                 if (stcb->asoc.local_auth_chunks != NULL) {
4798                         struct sctp_auth_chunk_list *chunks;
4799
4800                         if (padding_len > 0) {
4801                                 memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
4802                                 chunk_len += padding_len;
4803                                 padding_len = 0;
4804                         }
4805                         chunks = (struct sctp_auth_chunk_list *)(mtod(m, caddr_t)+chunk_len);
4806                         parameter_len = (uint16_t)(sizeof(struct sctp_auth_chunk_list) +
4807                             sctp_auth_get_chklist_size(stcb->asoc.local_auth_chunks));
4808                         chunks->ph.param_type = htons(SCTP_CHUNK_LIST);
4809                         chunks->ph.param_length = htons(parameter_len);
4810                         sctp_serialize_auth_chunks(stcb->asoc.local_auth_chunks, chunks->chunk_types);
4811                         padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
4812                         chunk_len += parameter_len;
4813                 }
4814         }
4815
4816         /* now any cookie time extensions */
4817         if (stcb->asoc.cookie_preserve_req > 0) {
4818                 struct sctp_cookie_perserve_param *cookie_preserve;
4819
4820                 if (padding_len > 0) {
4821                         memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
4822                         chunk_len += padding_len;
4823                         padding_len = 0;
4824                 }
4825                 parameter_len = (uint16_t)sizeof(struct sctp_cookie_perserve_param);
4826                 cookie_preserve = (struct sctp_cookie_perserve_param *)(mtod(m, caddr_t)+chunk_len);
4827                 cookie_preserve->ph.param_type = htons(SCTP_COOKIE_PRESERVE);
4828                 cookie_preserve->ph.param_length = htons(parameter_len);
4829                 cookie_preserve->time = htonl(stcb->asoc.cookie_preserve_req);
4830                 stcb->asoc.cookie_preserve_req = 0;
4831                 chunk_len += parameter_len;
4832         }
4833
4834         if (stcb->asoc.scope.ipv4_addr_legal || stcb->asoc.scope.ipv6_addr_legal) {
4835                 uint8_t i;
4836
4837                 if (padding_len > 0) {
4838                         memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
4839                         chunk_len += padding_len;
4840                         padding_len = 0;
4841                 }
4842                 parameter_len = (uint16_t)sizeof(struct sctp_paramhdr);
4843                 if (stcb->asoc.scope.ipv4_addr_legal) {
4844                         parameter_len += (uint16_t)sizeof(uint16_t);
4845                 }
4846                 if (stcb->asoc.scope.ipv6_addr_legal) {
4847                         parameter_len += (uint16_t)sizeof(uint16_t);
4848                 }
4849                 sup_addr = (struct sctp_supported_addr_param *)(mtod(m, caddr_t)+chunk_len);
4850                 sup_addr->ph.param_type = htons(SCTP_SUPPORTED_ADDRTYPE);
4851                 sup_addr->ph.param_length = htons(parameter_len);
4852                 i = 0;
4853                 if (stcb->asoc.scope.ipv4_addr_legal) {
4854                         sup_addr->addr_type[i++] = htons(SCTP_IPV4_ADDRESS);
4855                 }
4856                 if (stcb->asoc.scope.ipv6_addr_legal) {
4857                         sup_addr->addr_type[i++] = htons(SCTP_IPV6_ADDRESS);
4858                 }
4859                 padding_len = 4 - 2 * i;
4860                 chunk_len += parameter_len;
4861         }
4862
4863         SCTP_BUF_LEN(m) = chunk_len;
4864         /* now the addresses */
4865         /*
4866          * To optimize this we could put the scoping stuff into a structure
4867          * and remove the individual uint8's from the assoc structure. Then
4868          * we could just sifa in the address within the stcb. But for now
4869          * this is a quick hack to get the address stuff teased apart.
4870          */
4871         m_last = sctp_add_addresses_to_i_ia(inp, stcb, &stcb->asoc.scope,
4872             m, cnt_inits_to,
4873             &padding_len, &chunk_len);
4874
4875         init->ch.chunk_length = htons(chunk_len);
4876         if (padding_len > 0) {
4877                 if (sctp_add_pad_tombuf(m_last, padding_len) == NULL) {
4878                         sctp_m_freem(m);
4879                         return;
4880                 }
4881         }
4882         SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT - calls lowlevel_output\n");
4883         if ((error = sctp_lowlevel_chunk_output(inp, stcb, net,
4884             (struct sockaddr *)&net->ro._l_addr,
4885             m, 0, NULL, 0, 0, 0, 0,
4886             inp->sctp_lport, stcb->rport, htonl(0),
4887             net->port, NULL,
4888             0, 0,
4889             so_locked))) {
4890                 SCTPDBG(SCTP_DEBUG_OUTPUT4, "Gak send error %d\n", error);
4891                 if (error == ENOBUFS) {
4892                         stcb->asoc.ifp_had_enobuf = 1;
4893                         SCTP_STAT_INCR(sctps_lowlevelerr);
4894                 }
4895         } else {
4896                 stcb->asoc.ifp_had_enobuf = 0;
4897         }
4898         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
4899         (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
4900 }
4901
4902 struct mbuf *
4903 sctp_arethere_unrecognized_parameters(struct mbuf *in_initpkt,
4904     int param_offset, int *abort_processing,
4905     struct sctp_chunkhdr *cp,
4906     int *nat_friendly,
4907     int *cookie_found)
4908 {
4909         /*
4910          * Given a mbuf containing an INIT or INIT-ACK with the param_offset
4911          * being equal to the beginning of the params i.e. (iphlen +
4912          * sizeof(struct sctp_init_msg) parse through the parameters to the
4913          * end of the mbuf verifying that all parameters are known.
4914          *
4915          * For unknown parameters build and return a mbuf with
4916          * UNRECOGNIZED_PARAMETER errors. If the flags indicate to stop
4917          * processing this chunk stop, and set *abort_processing to 1.
4918          *
4919          * By having param_offset be pre-set to where parameters begin it is
4920          * hoped that this routine may be reused in the future by new
4921          * features.
4922          */
4923         struct sctp_paramhdr *phdr, params;
4924
4925         struct mbuf *mat, *m_tmp, *op_err, *op_err_last;
4926         int at, limit, pad_needed;
4927         uint16_t ptype, plen, padded_size;
4928
4929         *abort_processing = 0;
4930         if (cookie_found != NULL) {
4931                 *cookie_found = 0;
4932         }
4933         mat = in_initpkt;
4934         limit = ntohs(cp->chunk_length) - sizeof(struct sctp_init_chunk);
4935         at = param_offset;
4936         op_err = NULL;
4937         op_err_last = NULL;
4938         pad_needed = 0;
4939         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Check for unrecognized param's\n");
4940         phdr = sctp_get_next_param(mat, at, &params, sizeof(params));
4941         while ((phdr != NULL) && ((size_t)limit >= sizeof(struct sctp_paramhdr))) {
4942                 ptype = ntohs(phdr->param_type);
4943                 plen = ntohs(phdr->param_length);
4944                 if ((plen > limit) || (plen < sizeof(struct sctp_paramhdr))) {
4945                         /* wacked parameter */
4946                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error %d\n", plen);
4947                         goto invalid_size;
4948                 }
4949                 limit -= SCTP_SIZE32(plen);
4950                 /*-
4951                  * All parameters for all chunks that we know/understand are
4952                  * listed here. We process them other places and make
4953                  * appropriate stop actions per the upper bits. However this
4954                  * is the generic routine processor's can call to get back
4955                  * an operr.. to either incorporate (init-ack) or send.
4956                  */
4957                 padded_size = SCTP_SIZE32(plen);
4958                 switch (ptype) {
4959                         /* Param's with variable size */
4960                 case SCTP_HEARTBEAT_INFO:
4961                 case SCTP_UNRECOG_PARAM:
4962                 case SCTP_ERROR_CAUSE_IND:
4963                         /* ok skip fwd */
4964                         at += padded_size;
4965                         break;
4966                 case SCTP_STATE_COOKIE:
4967                         if (cookie_found != NULL) {
4968                                 *cookie_found = 1;
4969                         }
4970                         at += padded_size;
4971                         break;
4972                         /* Param's with variable size within a range */
4973                 case SCTP_CHUNK_LIST:
4974                 case SCTP_SUPPORTED_CHUNK_EXT:
4975                         if (padded_size > (sizeof(struct sctp_supported_chunk_types_param) + (sizeof(uint8_t) * SCTP_MAX_SUPPORTED_EXT))) {
4976                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error chklist %d\n", plen);
4977                                 goto invalid_size;
4978                         }
4979                         at += padded_size;
4980                         break;
4981                 case SCTP_SUPPORTED_ADDRTYPE:
4982                         if (padded_size > SCTP_MAX_ADDR_PARAMS_SIZE) {
4983                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error supaddrtype %d\n", plen);
4984                                 goto invalid_size;
4985                         }
4986                         at += padded_size;
4987                         break;
4988                 case SCTP_RANDOM:
4989                         if (padded_size > (sizeof(struct sctp_auth_random) + SCTP_RANDOM_MAX_SIZE)) {
4990                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error random %d\n", plen);
4991                                 goto invalid_size;
4992                         }
4993                         at += padded_size;
4994                         break;
4995                 case SCTP_SET_PRIM_ADDR:
4996                 case SCTP_DEL_IP_ADDRESS:
4997                 case SCTP_ADD_IP_ADDRESS:
4998                         if ((padded_size != sizeof(struct sctp_asconf_addrv4_param)) &&
4999                             (padded_size != sizeof(struct sctp_asconf_addr_param))) {
5000                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error setprim %d\n", plen);
5001                                 goto invalid_size;
5002                         }
5003                         at += padded_size;
5004                         break;
5005                         /* Param's with a fixed size */
5006                 case SCTP_IPV4_ADDRESS:
5007                         if (padded_size != sizeof(struct sctp_ipv4addr_param)) {
5008                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error ipv4 addr %d\n", plen);
5009                                 goto invalid_size;
5010                         }
5011                         at += padded_size;
5012                         break;
5013                 case SCTP_IPV6_ADDRESS:
5014                         if (padded_size != sizeof(struct sctp_ipv6addr_param)) {
5015                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error ipv6 addr %d\n", plen);
5016                                 goto invalid_size;
5017                         }
5018                         at += padded_size;
5019                         break;
5020                 case SCTP_COOKIE_PRESERVE:
5021                         if (padded_size != sizeof(struct sctp_cookie_perserve_param)) {
5022                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error cookie-preserve %d\n", plen);
5023                                 goto invalid_size;
5024                         }
5025                         at += padded_size;
5026                         break;
5027                 case SCTP_HAS_NAT_SUPPORT:
5028                         *nat_friendly = 1;
5029                         /* fall through */
5030                 case SCTP_PRSCTP_SUPPORTED:
5031                         if (padded_size != sizeof(struct sctp_paramhdr)) {
5032                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error prsctp/nat support %d\n", plen);
5033                                 goto invalid_size;
5034                         }
5035                         at += padded_size;
5036                         break;
5037                 case SCTP_ECN_CAPABLE:
5038                         if (padded_size != sizeof(struct sctp_paramhdr)) {
5039                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error ecn %d\n", plen);
5040                                 goto invalid_size;
5041                         }
5042                         at += padded_size;
5043                         break;
5044                 case SCTP_ULP_ADAPTATION:
5045                         if (padded_size != sizeof(struct sctp_adaptation_layer_indication)) {
5046                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error adapatation %d\n", plen);
5047                                 goto invalid_size;
5048                         }
5049                         at += padded_size;
5050                         break;
5051                 case SCTP_SUCCESS_REPORT:
5052                         if (padded_size != sizeof(struct sctp_asconf_paramhdr)) {
5053                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error success %d\n", plen);
5054                                 goto invalid_size;
5055                         }
5056                         at += padded_size;
5057                         break;
5058                 case SCTP_HOSTNAME_ADDRESS:
5059                         {
5060                                 /* Hostname parameters are deprecated. */
5061                                 struct sctp_gen_error_cause *cause;
5062                                 int l_len;
5063
5064                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Can't handle hostname addresses.. abort processing\n");
5065                                 *abort_processing = 1;
5066                                 sctp_m_freem(op_err);
5067                                 op_err = NULL;
5068                                 op_err_last = NULL;
5069 #ifdef INET6
5070                                 l_len = SCTP_MIN_OVERHEAD;
5071 #else
5072                                 l_len = SCTP_MIN_V4_OVERHEAD;
5073 #endif
5074                                 l_len += sizeof(struct sctp_chunkhdr);
5075                                 l_len += sizeof(struct sctp_gen_error_cause);
5076                                 op_err = sctp_get_mbuf_for_msg(l_len, 0, M_NOWAIT, 1, MT_DATA);
5077                                 if (op_err != NULL) {
5078                                         /*
5079                                          * Pre-reserve space for IP, SCTP,
5080                                          * and chunk header.
5081                                          */
5082 #ifdef INET6
5083                                         SCTP_BUF_RESV_UF(op_err, sizeof(struct ip6_hdr));
5084 #else
5085                                         SCTP_BUF_RESV_UF(op_err, sizeof(struct ip));
5086 #endif
5087                                         SCTP_BUF_RESV_UF(op_err, sizeof(struct sctphdr));
5088                                         SCTP_BUF_RESV_UF(op_err, sizeof(struct sctp_chunkhdr));
5089                                         SCTP_BUF_LEN(op_err) = sizeof(struct sctp_gen_error_cause);
5090                                         cause = mtod(op_err, struct sctp_gen_error_cause *);
5091                                         cause->code = htons(SCTP_CAUSE_UNRESOLVABLE_ADDR);
5092                                         cause->length = htons((uint16_t)(sizeof(struct sctp_gen_error_cause) + plen));
5093                                         SCTP_BUF_NEXT(op_err) = SCTP_M_COPYM(mat, at, plen, M_NOWAIT);
5094                                         if (SCTP_BUF_NEXT(op_err) == NULL) {
5095                                                 sctp_m_freem(op_err);
5096                                                 op_err = NULL;
5097                                                 op_err_last = NULL;
5098                                         }
5099                                 }
5100                                 return (op_err);
5101                         }
5102                 default:
5103                         /*
5104                          * we do not recognize the parameter figure out what
5105                          * we do.
5106                          */
5107                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Hit default param %x\n", ptype);
5108                         if ((ptype & 0x4000) == 0x4000) {
5109                                 /* Report bit is set?? */
5110                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "report op err\n");
5111                                 if (op_err == NULL) {
5112                                         int l_len;
5113
5114                                         /* Ok need to try to get an mbuf */
5115 #ifdef INET6
5116                                         l_len = SCTP_MIN_OVERHEAD;
5117 #else
5118                                         l_len = SCTP_MIN_V4_OVERHEAD;
5119 #endif
5120                                         l_len += sizeof(struct sctp_chunkhdr);
5121                                         l_len += sizeof(struct sctp_paramhdr);
5122                                         op_err = sctp_get_mbuf_for_msg(l_len, 0, M_NOWAIT, 1, MT_DATA);
5123                                         if (op_err) {
5124                                                 SCTP_BUF_LEN(op_err) = 0;
5125 #ifdef INET6
5126                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip6_hdr));
5127 #else
5128                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip));
5129 #endif
5130                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctphdr));
5131                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctp_chunkhdr));
5132                                                 op_err_last = op_err;
5133                                         }
5134                                 }
5135                                 if (op_err != NULL) {
5136                                         /* If we have space */
5137                                         struct sctp_paramhdr *param;
5138
5139                                         if (pad_needed > 0) {
5140                                                 op_err_last = sctp_add_pad_tombuf(op_err_last, pad_needed);
5141                                         }
5142                                         if (op_err_last == NULL) {
5143                                                 sctp_m_freem(op_err);
5144                                                 op_err = NULL;
5145                                                 op_err_last = NULL;
5146                                                 goto more_processing;
5147                                         }
5148                                         if (M_TRAILINGSPACE(op_err_last) < (int)sizeof(struct sctp_paramhdr)) {
5149                                                 m_tmp = sctp_get_mbuf_for_msg(sizeof(struct sctp_paramhdr), 0, M_NOWAIT, 1, MT_DATA);
5150                                                 if (m_tmp == NULL) {
5151                                                         sctp_m_freem(op_err);
5152                                                         op_err = NULL;
5153                                                         op_err_last = NULL;
5154                                                         goto more_processing;
5155                                                 }
5156                                                 SCTP_BUF_LEN(m_tmp) = 0;
5157                                                 SCTP_BUF_NEXT(m_tmp) = NULL;
5158                                                 SCTP_BUF_NEXT(op_err_last) = m_tmp;
5159                                                 op_err_last = m_tmp;
5160                                         }
5161                                         param = (struct sctp_paramhdr *)(mtod(op_err_last, caddr_t)+SCTP_BUF_LEN(op_err_last));
5162                                         param->param_type = htons(SCTP_UNRECOG_PARAM);
5163                                         param->param_length = htons((uint16_t)sizeof(struct sctp_paramhdr) + plen);
5164                                         SCTP_BUF_LEN(op_err_last) += sizeof(struct sctp_paramhdr);
5165                                         SCTP_BUF_NEXT(op_err_last) = SCTP_M_COPYM(mat, at, plen, M_NOWAIT);
5166                                         if (SCTP_BUF_NEXT(op_err_last) == NULL) {
5167                                                 sctp_m_freem(op_err);
5168                                                 op_err = NULL;
5169                                                 op_err_last = NULL;
5170                                                 goto more_processing;
5171                                         } else {
5172                                                 while (SCTP_BUF_NEXT(op_err_last) != NULL) {
5173                                                         op_err_last = SCTP_BUF_NEXT(op_err_last);
5174                                                 }
5175                                         }
5176                                         if (plen % 4 != 0) {
5177                                                 pad_needed = 4 - (plen % 4);
5178                                         } else {
5179                                                 pad_needed = 0;
5180                                         }
5181                                 }
5182                         }
5183         more_processing:
5184                         if ((ptype & 0x8000) == 0x0000) {
5185                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "stop proc\n");
5186                                 return (op_err);
5187                         } else {
5188                                 /* skip this chunk and continue processing */
5189                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "move on\n");
5190                                 at += SCTP_SIZE32(plen);
5191                         }
5192                         break;
5193                 }
5194                 phdr = sctp_get_next_param(mat, at, &params, sizeof(params));
5195         }
5196         return (op_err);
5197 invalid_size:
5198         SCTPDBG(SCTP_DEBUG_OUTPUT1, "abort flag set\n");
5199         *abort_processing = 1;
5200         sctp_m_freem(op_err);
5201         op_err = NULL;
5202         op_err_last = NULL;
5203         if (phdr != NULL) {
5204                 struct sctp_paramhdr *param;
5205                 int l_len;
5206 #ifdef INET6
5207                 l_len = SCTP_MIN_OVERHEAD;
5208 #else
5209                 l_len = SCTP_MIN_V4_OVERHEAD;
5210 #endif
5211                 l_len += sizeof(struct sctp_chunkhdr);
5212                 l_len += (2 * sizeof(struct sctp_paramhdr));
5213                 op_err = sctp_get_mbuf_for_msg(l_len, 0, M_NOWAIT, 1, MT_DATA);
5214                 if (op_err) {
5215                         SCTP_BUF_LEN(op_err) = 0;
5216 #ifdef INET6
5217                         SCTP_BUF_RESV_UF(op_err, sizeof(struct ip6_hdr));
5218 #else
5219                         SCTP_BUF_RESV_UF(op_err, sizeof(struct ip));
5220 #endif
5221                         SCTP_BUF_RESV_UF(op_err, sizeof(struct sctphdr));
5222                         SCTP_BUF_RESV_UF(op_err, sizeof(struct sctp_chunkhdr));
5223                         SCTP_BUF_LEN(op_err) = 2 * sizeof(struct sctp_paramhdr);
5224                         param = mtod(op_err, struct sctp_paramhdr *);
5225                         param->param_type = htons(SCTP_CAUSE_PROTOCOL_VIOLATION);
5226                         param->param_length = htons(2 * sizeof(struct sctp_paramhdr));
5227                         param++;
5228                         param->param_type = htons(ptype);
5229                         param->param_length = htons(plen);
5230                 }
5231         }
5232         return (op_err);
5233 }
5234
5235 /*
5236  * Given a INIT chunk, look through the parameters to verify that there
5237  * are no new addresses.
5238  * Return true, if there is a new address or there is a problem parsing
5239    the parameters. Provide an optional error cause used when sending an ABORT.
5240  * Return false, if there are no new addresses and there is no problem in
5241    parameter processing.
5242  */
5243 static bool
5244 sctp_are_there_new_addresses(struct sctp_association *asoc,
5245     struct mbuf *in_initpkt, int offset, int limit, struct sockaddr *src,
5246     struct mbuf **op_err)
5247 {
5248         struct sockaddr *sa_touse;
5249         struct sockaddr *sa;
5250         struct sctp_paramhdr *phdr, params;
5251         struct sctp_nets *net;
5252 #ifdef INET
5253         struct sockaddr_in sin4, *sa4;
5254 #endif
5255 #ifdef INET6
5256         struct sockaddr_in6 sin6, *sa6;
5257 #endif
5258         uint16_t ptype, plen;
5259         bool fnd, check_src;
5260
5261         *op_err = NULL;
5262 #ifdef INET
5263         memset(&sin4, 0, sizeof(sin4));
5264         sin4.sin_family = AF_INET;
5265         sin4.sin_len = sizeof(sin4);
5266 #endif
5267 #ifdef INET6
5268         memset(&sin6, 0, sizeof(sin6));
5269         sin6.sin6_family = AF_INET6;
5270         sin6.sin6_len = sizeof(sin6);
5271 #endif
5272         /* First what about the src address of the pkt ? */
5273         check_src = false;
5274         switch (src->sa_family) {
5275 #ifdef INET
5276         case AF_INET:
5277                 if (asoc->scope.ipv4_addr_legal) {
5278                         check_src = true;
5279                 }
5280                 break;
5281 #endif
5282 #ifdef INET6
5283         case AF_INET6:
5284                 if (asoc->scope.ipv6_addr_legal) {
5285                         check_src = true;
5286                 }
5287                 break;
5288 #endif
5289         default:
5290                 /* TSNH */
5291                 break;
5292         }
5293         if (check_src) {
5294                 fnd = false;
5295                 TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
5296                         sa = (struct sockaddr *)&net->ro._l_addr;
5297                         if (sa->sa_family == src->sa_family) {
5298 #ifdef INET
5299                                 if (sa->sa_family == AF_INET) {
5300                                         struct sockaddr_in *src4;
5301
5302                                         sa4 = (struct sockaddr_in *)sa;
5303                                         src4 = (struct sockaddr_in *)src;
5304                                         if (sa4->sin_addr.s_addr == src4->sin_addr.s_addr) {
5305                                                 fnd = true;
5306                                                 break;
5307                                         }
5308                                 }
5309 #endif
5310 #ifdef INET6
5311                                 if (sa->sa_family == AF_INET6) {
5312                                         struct sockaddr_in6 *src6;
5313
5314                                         sa6 = (struct sockaddr_in6 *)sa;
5315                                         src6 = (struct sockaddr_in6 *)src;
5316                                         if (SCTP6_ARE_ADDR_EQUAL(sa6, src6)) {
5317                                                 fnd = true;
5318                                                 break;
5319                                         }
5320                                 }
5321 #endif
5322                         }
5323                 }
5324                 if (!fnd) {
5325                         /*
5326                          * If sending an ABORT in case of an additional
5327                          * address, don't use the new address error cause.
5328                          * This looks no different than if no listener was
5329                          * present.
5330                          */
5331                         *op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), "Address added");
5332                         return (true);
5333                 }
5334         }
5335         /* Ok so far lets munge through the rest of the packet */
5336         offset += sizeof(struct sctp_init_chunk);
5337         phdr = sctp_get_next_param(in_initpkt, offset, &params, sizeof(params));
5338         while (phdr) {
5339                 sa_touse = NULL;
5340                 ptype = ntohs(phdr->param_type);
5341                 plen = ntohs(phdr->param_length);
5342                 if (offset + plen > limit) {
5343                         *op_err = sctp_generate_cause(SCTP_CAUSE_PROTOCOL_VIOLATION, "Partial parameter");
5344                         return (true);
5345                 }
5346                 if (plen < sizeof(struct sctp_paramhdr)) {
5347                         *op_err = sctp_generate_cause(SCTP_CAUSE_PROTOCOL_VIOLATION, "Parameter length too small");
5348                         return (true);
5349                 }
5350                 switch (ptype) {
5351 #ifdef INET
5352                 case SCTP_IPV4_ADDRESS:
5353                         {
5354                                 struct sctp_ipv4addr_param *p4, p4_buf;
5355
5356                                 if (plen != sizeof(struct sctp_ipv4addr_param)) {
5357                                         *op_err = sctp_generate_cause(SCTP_CAUSE_PROTOCOL_VIOLATION, "Parameter length illegal");
5358                                         return (true);
5359                                 }
5360                                 phdr = sctp_get_next_param(in_initpkt, offset,
5361                                     (struct sctp_paramhdr *)&p4_buf, sizeof(p4_buf));
5362                                 if (phdr == NULL) {
5363                                         *op_err = sctp_generate_cause(SCTP_CAUSE_PROTOCOL_VIOLATION, "");
5364                                         return (true);
5365                                 }
5366                                 if (asoc->scope.ipv4_addr_legal) {
5367                                         p4 = (struct sctp_ipv4addr_param *)phdr;
5368                                         sin4.sin_addr.s_addr = p4->addr;
5369                                         sa_touse = (struct sockaddr *)&sin4;
5370                                 }
5371                                 break;
5372                         }
5373 #endif
5374 #ifdef INET6
5375                 case SCTP_IPV6_ADDRESS:
5376                         {
5377                                 struct sctp_ipv6addr_param *p6, p6_buf;
5378
5379                                 if (plen != sizeof(struct sctp_ipv6addr_param)) {
5380                                         *op_err = sctp_generate_cause(SCTP_CAUSE_PROTOCOL_VIOLATION, "Parameter length illegal");
5381                                         return (true);
5382                                 }
5383                                 phdr = sctp_get_next_param(in_initpkt, offset,
5384                                     (struct sctp_paramhdr *)&p6_buf, sizeof(p6_buf));
5385                                 if (phdr == NULL) {
5386                                         *op_err = sctp_generate_cause(SCTP_CAUSE_PROTOCOL_VIOLATION, "");
5387                                         return (true);
5388                                 }
5389                                 if (asoc->scope.ipv6_addr_legal) {
5390                                         p6 = (struct sctp_ipv6addr_param *)phdr;
5391                                         memcpy((caddr_t)&sin6.sin6_addr, p6->addr,
5392                                             sizeof(p6->addr));
5393                                         sa_touse = (struct sockaddr *)&sin6;
5394                                 }
5395                                 break;
5396                         }
5397 #endif
5398                 default:
5399                         sa_touse = NULL;
5400                         break;
5401                 }
5402                 if (sa_touse) {
5403                         /* ok, sa_touse points to one to check */
5404                         fnd = false;
5405                         TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
5406                                 sa = (struct sockaddr *)&net->ro._l_addr;
5407                                 if (sa->sa_family != sa_touse->sa_family) {
5408                                         continue;
5409                                 }
5410 #ifdef INET
5411                                 if (sa->sa_family == AF_INET) {
5412                                         sa4 = (struct sockaddr_in *)sa;
5413                                         if (sa4->sin_addr.s_addr ==
5414                                             sin4.sin_addr.s_addr) {
5415                                                 fnd = true;
5416                                                 break;
5417                                         }
5418                                 }
5419 #endif
5420 #ifdef INET6
5421                                 if (sa->sa_family == AF_INET6) {
5422                                         sa6 = (struct sockaddr_in6 *)sa;
5423                                         if (SCTP6_ARE_ADDR_EQUAL(
5424                                             sa6, &sin6)) {
5425                                                 fnd = true;
5426                                                 break;
5427                                         }
5428                                 }
5429 #endif
5430                         }
5431                         if (!fnd) {
5432                                 /*
5433                                  * If sending an ABORT in case of an
5434                                  * additional address, don't use the new
5435                                  * address error cause. This looks no
5436                                  * different than if no listener was
5437                                  * present.
5438                                  */
5439                                 *op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), "Address added");
5440                                 return (true);
5441                         }
5442                 }
5443                 offset += SCTP_SIZE32(plen);
5444                 if (offset >= limit) {
5445                         break;
5446                 }
5447                 phdr = sctp_get_next_param(in_initpkt, offset, &params, sizeof(params));
5448         }
5449         return (false);
5450 }
5451
5452 /*
5453  * Given a MBUF chain that was sent into us containing an INIT. Build a
5454  * INIT-ACK with COOKIE and send back. We assume that the in_initpkt has done
5455  * a pullup to include IPv6/4header, SCTP header and initial part of INIT
5456  * message (i.e. the struct sctp_init_msg).
5457  */
5458 void
5459 sctp_send_initiate_ack(struct sctp_inpcb *inp, struct sctp_tcb *stcb,
5460     struct sctp_nets *src_net, struct mbuf *init_pkt,
5461     int iphlen, int offset,
5462     struct sockaddr *src, struct sockaddr *dst,
5463     struct sctphdr *sh, struct sctp_init_chunk *init_chk,
5464     uint8_t mflowtype, uint32_t mflowid,
5465     uint32_t vrf_id, uint16_t port)
5466 {
5467         struct sctp_association *asoc;
5468         struct mbuf *m, *m_tmp, *m_last, *m_cookie, *op_err;
5469         struct sctp_init_ack_chunk *initack;
5470         struct sctp_adaptation_layer_indication *ali;
5471         struct sctp_supported_chunk_types_param *pr_supported;
5472         struct sctp_paramhdr *ph;
5473         union sctp_sockstore *over_addr;
5474         struct sctp_scoping scp;
5475         struct timeval now;
5476 #ifdef INET
5477         struct sockaddr_in *dst4 = (struct sockaddr_in *)dst;
5478         struct sockaddr_in *src4 = (struct sockaddr_in *)src;
5479         struct sockaddr_in *sin;
5480 #endif
5481 #ifdef INET6
5482         struct sockaddr_in6 *dst6 = (struct sockaddr_in6 *)dst;
5483         struct sockaddr_in6 *src6 = (struct sockaddr_in6 *)src;
5484         struct sockaddr_in6 *sin6;
5485 #endif
5486         struct sockaddr *to;
5487         struct sctp_state_cookie stc;
5488         struct sctp_nets *net = NULL;
5489         uint8_t *signature = NULL;
5490         int cnt_inits_to = 0;
5491         uint16_t his_limit, i_want;
5492         int abort_flag;
5493         int nat_friendly = 0;
5494         int error;
5495         struct socket *so;
5496         uint16_t num_ext, chunk_len, padding_len, parameter_len;
5497
5498         if (stcb) {
5499                 asoc = &stcb->asoc;
5500         } else {
5501                 asoc = NULL;
5502         }
5503         if ((asoc != NULL) &&
5504             (SCTP_GET_STATE(stcb) != SCTP_STATE_COOKIE_WAIT)) {
5505                 if (sctp_are_there_new_addresses(asoc, init_pkt, offset, offset + ntohs(init_chk->ch.chunk_length), src, &op_err)) {
5506                         /*
5507                          * new addresses, out of here in non-cookie-wait
5508                          * states
5509                          */
5510                         sctp_send_abort(init_pkt, iphlen, src, dst, sh, 0, op_err,
5511                             mflowtype, mflowid, inp->fibnum,
5512                             vrf_id, port);
5513                         return;
5514                 }
5515                 if (src_net != NULL && (src_net->port != port)) {
5516                         /*
5517                          * change of remote encapsulation port, out of here
5518                          * in non-cookie-wait states
5519                          *
5520                          * Send an ABORT, without an specific error cause.
5521                          * This looks no different than if no listener was
5522                          * present.
5523                          */
5524                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
5525                             "Remote encapsulation port changed");
5526                         sctp_send_abort(init_pkt, iphlen, src, dst, sh, 0, op_err,
5527                             mflowtype, mflowid, inp->fibnum,
5528                             vrf_id, port);
5529                         return;
5530                 }
5531         }
5532         abort_flag = 0;
5533         op_err = sctp_arethere_unrecognized_parameters(init_pkt,
5534             (offset + sizeof(struct sctp_init_chunk)),
5535             &abort_flag,
5536             (struct sctp_chunkhdr *)init_chk,
5537             &nat_friendly, NULL);
5538         if (abort_flag) {
5539 do_a_abort:
5540                 if (op_err == NULL) {
5541                         char msg[SCTP_DIAG_INFO_LEN];
5542
5543                         SCTP_SNPRINTF(msg, sizeof(msg), "%s:%d at %s", __FILE__, __LINE__, __func__);
5544                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
5545                             msg);
5546                 }
5547                 sctp_send_abort(init_pkt, iphlen, src, dst, sh,
5548                     init_chk->init.initiate_tag, op_err,
5549                     mflowtype, mflowid, inp->fibnum,
5550                     vrf_id, port);
5551                 return;
5552         }
5553         m = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
5554         if (m == NULL) {
5555                 /* No memory, INIT timer will re-attempt. */
5556                 sctp_m_freem(op_err);
5557                 return;
5558         }
5559         chunk_len = (uint16_t)sizeof(struct sctp_init_ack_chunk);
5560         padding_len = 0;
5561
5562         /*
5563          * We might not overwrite the identification[] completely and on
5564          * some platforms time_entered will contain some padding. Therefore
5565          * zero out the cookie to avoid putting uninitialized memory on the
5566          * wire.
5567          */
5568         memset(&stc, 0, sizeof(struct sctp_state_cookie));
5569
5570         /* the time I built cookie */
5571         (void)SCTP_GETTIME_TIMEVAL(&now);
5572         stc.time_entered.tv_sec = now.tv_sec;
5573         stc.time_entered.tv_usec = now.tv_usec;
5574
5575         /* populate any tie tags */
5576         if (asoc != NULL) {
5577                 /* unlock before tag selections */
5578                 stc.tie_tag_my_vtag = asoc->my_vtag_nonce;
5579                 stc.tie_tag_peer_vtag = asoc->peer_vtag_nonce;
5580                 stc.cookie_life = asoc->cookie_life;
5581                 net = asoc->primary_destination;
5582         } else {
5583                 stc.tie_tag_my_vtag = 0;
5584                 stc.tie_tag_peer_vtag = 0;
5585                 /* life I will award this cookie */
5586                 stc.cookie_life = inp->sctp_ep.def_cookie_life;
5587         }
5588
5589         /* copy in the ports for later check */
5590         stc.myport = sh->dest_port;
5591         stc.peerport = sh->src_port;
5592
5593         /*
5594          * If we wanted to honor cookie life extensions, we would add to
5595          * stc.cookie_life. For now we should NOT honor any extension
5596          */
5597         stc.site_scope = stc.local_scope = stc.loopback_scope = 0;
5598         if (inp->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
5599                 stc.ipv6_addr_legal = 1;
5600                 if (SCTP_IPV6_V6ONLY(inp)) {
5601                         stc.ipv4_addr_legal = 0;
5602                 } else {
5603                         stc.ipv4_addr_legal = 1;
5604                 }
5605         } else {
5606                 stc.ipv6_addr_legal = 0;
5607                 stc.ipv4_addr_legal = 1;
5608         }
5609         stc.ipv4_scope = 0;
5610         if (net == NULL) {
5611                 to = src;
5612                 switch (dst->sa_family) {
5613 #ifdef INET
5614                 case AF_INET:
5615                         {
5616                                 /* lookup address */
5617                                 stc.address[0] = src4->sin_addr.s_addr;
5618                                 stc.address[1] = 0;
5619                                 stc.address[2] = 0;
5620                                 stc.address[3] = 0;
5621                                 stc.addr_type = SCTP_IPV4_ADDRESS;
5622                                 /* local from address */
5623                                 stc.laddress[0] = dst4->sin_addr.s_addr;
5624                                 stc.laddress[1] = 0;
5625                                 stc.laddress[2] = 0;
5626                                 stc.laddress[3] = 0;
5627                                 stc.laddr_type = SCTP_IPV4_ADDRESS;
5628                                 /* scope_id is only for v6 */
5629                                 stc.scope_id = 0;
5630                                 if ((IN4_ISPRIVATE_ADDRESS(&src4->sin_addr)) ||
5631                                     (IN4_ISPRIVATE_ADDRESS(&dst4->sin_addr))) {
5632                                         stc.ipv4_scope = 1;
5633                                 }
5634                                 /* Must use the address in this case */
5635                                 if (sctp_is_address_on_local_host(src, vrf_id)) {
5636                                         stc.loopback_scope = 1;
5637                                         stc.ipv4_scope = 1;
5638                                         stc.site_scope = 1;
5639                                         stc.local_scope = 0;
5640                                 }
5641                                 break;
5642                         }
5643 #endif
5644 #ifdef INET6
5645                 case AF_INET6:
5646                         {
5647                                 stc.addr_type = SCTP_IPV6_ADDRESS;
5648                                 memcpy(&stc.address, &src6->sin6_addr, sizeof(struct in6_addr));
5649                                 stc.scope_id = ntohs(in6_getscope(&src6->sin6_addr));
5650                                 if (sctp_is_address_on_local_host(src, vrf_id)) {
5651                                         stc.loopback_scope = 1;
5652                                         stc.local_scope = 0;
5653                                         stc.site_scope = 1;
5654                                         stc.ipv4_scope = 1;
5655                                 } else if (IN6_IS_ADDR_LINKLOCAL(&src6->sin6_addr) ||
5656                                     IN6_IS_ADDR_LINKLOCAL(&dst6->sin6_addr)) {
5657                                         /*
5658                                          * If the new destination or source
5659                                          * is a LINK_LOCAL we must have
5660                                          * common both site and local scope.
5661                                          * Don't set local scope though
5662                                          * since we must depend on the
5663                                          * source to be added implicitly. We
5664                                          * cannot assure just because we
5665                                          * share one link that all links are
5666                                          * common.
5667                                          */
5668                                         stc.local_scope = 0;
5669                                         stc.site_scope = 1;
5670                                         stc.ipv4_scope = 1;
5671                                         /*
5672                                          * we start counting for the private
5673                                          * address stuff at 1. since the
5674                                          * link local we source from won't
5675                                          * show up in our scoped count.
5676                                          */
5677                                         cnt_inits_to = 1;
5678                                         /*
5679                                          * pull out the scope_id from
5680                                          * incoming pkt
5681                                          */
5682                                 } else if (IN6_IS_ADDR_SITELOCAL(&src6->sin6_addr) ||
5683                                     IN6_IS_ADDR_SITELOCAL(&dst6->sin6_addr)) {
5684                                         /*
5685                                          * If the new destination or source
5686                                          * is SITE_LOCAL then we must have
5687                                          * site scope in common.
5688                                          */
5689                                         stc.site_scope = 1;
5690                                 }
5691                                 memcpy(&stc.laddress, &dst6->sin6_addr, sizeof(struct in6_addr));
5692                                 stc.laddr_type = SCTP_IPV6_ADDRESS;
5693                                 break;
5694                         }
5695 #endif
5696                 default:
5697                         /* TSNH */
5698                         goto do_a_abort;
5699                         break;
5700                 }
5701         } else {
5702                 /* set the scope per the existing tcb */
5703
5704 #ifdef INET6
5705                 struct sctp_nets *lnet;
5706 #endif
5707
5708                 stc.loopback_scope = asoc->scope.loopback_scope;
5709                 stc.ipv4_scope = asoc->scope.ipv4_local_scope;
5710                 stc.site_scope = asoc->scope.site_scope;
5711                 stc.local_scope = asoc->scope.local_scope;
5712 #ifdef INET6
5713                 /* Why do we not consider IPv4 LL addresses? */
5714                 TAILQ_FOREACH(lnet, &asoc->nets, sctp_next) {
5715                         if (lnet->ro._l_addr.sin6.sin6_family == AF_INET6) {
5716                                 if (IN6_IS_ADDR_LINKLOCAL(&lnet->ro._l_addr.sin6.sin6_addr)) {
5717                                         /*
5718                                          * if we have a LL address, start
5719                                          * counting at 1.
5720                                          */
5721                                         cnt_inits_to = 1;
5722                                 }
5723                         }
5724                 }
5725 #endif
5726                 /* use the net pointer */
5727                 to = (struct sockaddr *)&net->ro._l_addr;
5728                 switch (to->sa_family) {
5729 #ifdef INET
5730                 case AF_INET:
5731                         sin = (struct sockaddr_in *)to;
5732                         stc.address[0] = sin->sin_addr.s_addr;
5733                         stc.address[1] = 0;
5734                         stc.address[2] = 0;
5735                         stc.address[3] = 0;
5736                         stc.addr_type = SCTP_IPV4_ADDRESS;
5737                         if (net->src_addr_selected == 0) {
5738                                 /*
5739                                  * strange case here, the INIT should have
5740                                  * did the selection.
5741                                  */
5742                                 net->ro._s_addr = sctp_source_address_selection(inp,
5743                                     stcb, (sctp_route_t *)&net->ro,
5744                                     net, 0, vrf_id);
5745                                 if (net->ro._s_addr == NULL) {
5746                                         sctp_m_freem(op_err);
5747                                         sctp_m_freem(m);
5748                                         return;
5749                                 }
5750
5751                                 net->src_addr_selected = 1;
5752                         }
5753                         stc.laddress[0] = net->ro._s_addr->address.sin.sin_addr.s_addr;
5754                         stc.laddress[1] = 0;
5755                         stc.laddress[2] = 0;
5756                         stc.laddress[3] = 0;
5757                         stc.laddr_type = SCTP_IPV4_ADDRESS;
5758                         /* scope_id is only for v6 */
5759                         stc.scope_id = 0;
5760                         break;
5761 #endif
5762 #ifdef INET6
5763                 case AF_INET6:
5764                         sin6 = (struct sockaddr_in6 *)to;
5765                         memcpy(&stc.address, &sin6->sin6_addr,
5766                             sizeof(struct in6_addr));
5767                         stc.addr_type = SCTP_IPV6_ADDRESS;
5768                         stc.scope_id = sin6->sin6_scope_id;
5769                         if (net->src_addr_selected == 0) {
5770                                 /*
5771                                  * strange case here, the INIT should have
5772                                  * done the selection.
5773                                  */
5774                                 net->ro._s_addr = sctp_source_address_selection(inp,
5775                                     stcb, (sctp_route_t *)&net->ro,
5776                                     net, 0, vrf_id);
5777                                 if (net->ro._s_addr == NULL) {
5778                                         sctp_m_freem(op_err);
5779                                         sctp_m_freem(m);
5780                                         return;
5781                                 }
5782
5783                                 net->src_addr_selected = 1;
5784                         }
5785                         memcpy(&stc.laddress, &net->ro._s_addr->address.sin6.sin6_addr,
5786                             sizeof(struct in6_addr));
5787                         stc.laddr_type = SCTP_IPV6_ADDRESS;
5788                         break;
5789 #endif
5790                 }
5791         }
5792         /* Now lets put the SCTP header in place */
5793         initack = mtod(m, struct sctp_init_ack_chunk *);
5794         /* Save it off for quick ref */
5795         stc.peers_vtag = ntohl(init_chk->init.initiate_tag);
5796         /* who are we */
5797         memcpy(stc.identification, SCTP_VERSION_STRING,
5798             min(strlen(SCTP_VERSION_STRING), sizeof(stc.identification)));
5799         memset(stc.reserved, 0, SCTP_RESERVE_SPACE);
5800         /* now the chunk header */
5801         initack->ch.chunk_type = SCTP_INITIATION_ACK;
5802         initack->ch.chunk_flags = 0;
5803         /* fill in later from mbuf we build */
5804         initack->ch.chunk_length = 0;
5805         /* place in my tag */
5806         if ((asoc != NULL) &&
5807             ((SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_WAIT) ||
5808             (SCTP_GET_STATE(stcb) == SCTP_STATE_INUSE) ||
5809             (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED))) {
5810                 /* re-use the v-tags and init-seq here */
5811                 initack->init.initiate_tag = htonl(asoc->my_vtag);
5812                 initack->init.initial_tsn = htonl(asoc->init_seq_number);
5813         } else {
5814                 uint32_t vtag, itsn;
5815
5816                 if (asoc) {
5817                         atomic_add_int(&asoc->refcnt, 1);
5818                         SCTP_TCB_UNLOCK(stcb);
5819         new_tag:
5820                         vtag = sctp_select_a_tag(inp, inp->sctp_lport, sh->src_port, 1);
5821                         if ((asoc->peer_supports_nat) && (vtag == asoc->my_vtag)) {
5822                                 /*
5823                                  * Got a duplicate vtag on some guy behind a
5824                                  * nat make sure we don't use it.
5825                                  */
5826                                 goto new_tag;
5827                         }
5828                         initack->init.initiate_tag = htonl(vtag);
5829                         /* get a TSN to use too */
5830                         itsn = sctp_select_initial_TSN(&inp->sctp_ep);
5831                         initack->init.initial_tsn = htonl(itsn);
5832                         SCTP_TCB_LOCK(stcb);
5833                         atomic_add_int(&asoc->refcnt, -1);
5834                 } else {
5835                         SCTP_INP_INCR_REF(inp);
5836                         SCTP_INP_RUNLOCK(inp);
5837                         vtag = sctp_select_a_tag(inp, inp->sctp_lport, sh->src_port, 1);
5838                         initack->init.initiate_tag = htonl(vtag);
5839                         /* get a TSN to use too */
5840                         initack->init.initial_tsn = htonl(sctp_select_initial_TSN(&inp->sctp_ep));
5841                         SCTP_INP_RLOCK(inp);
5842                         SCTP_INP_DECR_REF(inp);
5843                 }
5844         }
5845         /* save away my tag to */
5846         stc.my_vtag = initack->init.initiate_tag;
5847
5848         /* set up some of the credits. */
5849         so = inp->sctp_socket;
5850         if (so == NULL) {
5851                 /* memory problem */
5852                 sctp_m_freem(op_err);
5853                 sctp_m_freem(m);
5854                 return;
5855         } else {
5856                 initack->init.a_rwnd = htonl(max(SCTP_SB_LIMIT_RCV(so), SCTP_MINIMAL_RWND));
5857         }
5858         /* set what I want */
5859         his_limit = ntohs(init_chk->init.num_inbound_streams);
5860         /* choose what I want */
5861         if (asoc != NULL) {
5862                 if (asoc->streamoutcnt > asoc->pre_open_streams) {
5863                         i_want = asoc->streamoutcnt;
5864                 } else {
5865                         i_want = asoc->pre_open_streams;
5866                 }
5867         } else {
5868                 i_want = inp->sctp_ep.pre_open_stream_count;
5869         }
5870         if (his_limit < i_want) {
5871                 /* I Want more :< */
5872                 initack->init.num_outbound_streams = init_chk->init.num_inbound_streams;
5873         } else {
5874                 /* I can have what I want :> */
5875                 initack->init.num_outbound_streams = htons(i_want);
5876         }
5877         /* tell him his limit. */
5878         initack->init.num_inbound_streams =
5879             htons(inp->sctp_ep.max_open_streams_intome);
5880
5881         /* adaptation layer indication parameter */
5882         if (inp->sctp_ep.adaptation_layer_indicator_provided) {
5883                 parameter_len = (uint16_t)sizeof(struct sctp_adaptation_layer_indication);
5884                 ali = (struct sctp_adaptation_layer_indication *)(mtod(m, caddr_t)+chunk_len);
5885                 ali->ph.param_type = htons(SCTP_ULP_ADAPTATION);
5886                 ali->ph.param_length = htons(parameter_len);
5887                 ali->indication = htonl(inp->sctp_ep.adaptation_layer_indicator);
5888                 chunk_len += parameter_len;
5889         }
5890
5891         /* ECN parameter */
5892         if (((asoc != NULL) && (asoc->ecn_supported == 1)) ||
5893             ((asoc == NULL) && (inp->ecn_supported == 1))) {
5894                 parameter_len = (uint16_t)sizeof(struct sctp_paramhdr);
5895                 ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
5896                 ph->param_type = htons(SCTP_ECN_CAPABLE);
5897                 ph->param_length = htons(parameter_len);
5898                 chunk_len += parameter_len;
5899         }
5900
5901         /* PR-SCTP supported parameter */
5902         if (((asoc != NULL) && (asoc->prsctp_supported == 1)) ||
5903             ((asoc == NULL) && (inp->prsctp_supported == 1))) {
5904                 parameter_len = (uint16_t)sizeof(struct sctp_paramhdr);
5905                 ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
5906                 ph->param_type = htons(SCTP_PRSCTP_SUPPORTED);
5907                 ph->param_length = htons(parameter_len);
5908                 chunk_len += parameter_len;
5909         }
5910
5911         /* Add NAT friendly parameter */
5912         if (nat_friendly) {
5913                 parameter_len = (uint16_t)sizeof(struct sctp_paramhdr);
5914                 ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
5915                 ph->param_type = htons(SCTP_HAS_NAT_SUPPORT);
5916                 ph->param_length = htons(parameter_len);
5917                 chunk_len += parameter_len;
5918         }
5919
5920         /* And now tell the peer which extensions we support */
5921         num_ext = 0;
5922         pr_supported = (struct sctp_supported_chunk_types_param *)(mtod(m, caddr_t)+chunk_len);
5923         if (((asoc != NULL) && (asoc->prsctp_supported == 1)) ||
5924             ((asoc == NULL) && (inp->prsctp_supported == 1))) {
5925                 pr_supported->chunk_types[num_ext++] = SCTP_FORWARD_CUM_TSN;
5926                 if (((asoc != NULL) && (asoc->idata_supported == 1)) ||
5927                     ((asoc == NULL) && (inp->idata_supported == 1))) {
5928                         pr_supported->chunk_types[num_ext++] = SCTP_IFORWARD_CUM_TSN;
5929                 }
5930         }
5931         if (((asoc != NULL) && (asoc->auth_supported == 1)) ||
5932             ((asoc == NULL) && (inp->auth_supported == 1))) {
5933                 pr_supported->chunk_types[num_ext++] = SCTP_AUTHENTICATION;
5934         }
5935         if (((asoc != NULL) && (asoc->asconf_supported == 1)) ||
5936             ((asoc == NULL) && (inp->asconf_supported == 1))) {
5937                 pr_supported->chunk_types[num_ext++] = SCTP_ASCONF;
5938                 pr_supported->chunk_types[num_ext++] = SCTP_ASCONF_ACK;
5939         }
5940         if (((asoc != NULL) && (asoc->reconfig_supported == 1)) ||
5941             ((asoc == NULL) && (inp->reconfig_supported == 1))) {
5942                 pr_supported->chunk_types[num_ext++] = SCTP_STREAM_RESET;
5943         }
5944         if (((asoc != NULL) && (asoc->idata_supported == 1)) ||
5945             ((asoc == NULL) && (inp->idata_supported == 1))) {
5946                 pr_supported->chunk_types[num_ext++] = SCTP_IDATA;
5947         }
5948         if (((asoc != NULL) && (asoc->nrsack_supported == 1)) ||
5949             ((asoc == NULL) && (inp->nrsack_supported == 1))) {
5950                 pr_supported->chunk_types[num_ext++] = SCTP_NR_SELECTIVE_ACK;
5951         }
5952         if (((asoc != NULL) && (asoc->pktdrop_supported == 1)) ||
5953             ((asoc == NULL) && (inp->pktdrop_supported == 1))) {
5954                 pr_supported->chunk_types[num_ext++] = SCTP_PACKET_DROPPED;
5955         }
5956         if (num_ext > 0) {
5957                 parameter_len = (uint16_t)sizeof(struct sctp_supported_chunk_types_param) + num_ext;
5958                 pr_supported->ph.param_type = htons(SCTP_SUPPORTED_CHUNK_EXT);
5959                 pr_supported->ph.param_length = htons(parameter_len);
5960                 padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
5961                 chunk_len += parameter_len;
5962         }
5963
5964         /* add authentication parameters */
5965         if (((asoc != NULL) && (asoc->auth_supported == 1)) ||
5966             ((asoc == NULL) && (inp->auth_supported == 1))) {
5967                 struct sctp_auth_random *randp;
5968                 struct sctp_auth_hmac_algo *hmacs;
5969                 struct sctp_auth_chunk_list *chunks;
5970
5971                 if (padding_len > 0) {
5972                         memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
5973                         chunk_len += padding_len;
5974                         padding_len = 0;
5975                 }
5976                 /* generate and add RANDOM parameter */
5977                 randp = (struct sctp_auth_random *)(mtod(m, caddr_t)+chunk_len);
5978                 parameter_len = (uint16_t)sizeof(struct sctp_auth_random) +
5979                     SCTP_AUTH_RANDOM_SIZE_DEFAULT;
5980                 randp->ph.param_type = htons(SCTP_RANDOM);
5981                 randp->ph.param_length = htons(parameter_len);
5982                 SCTP_READ_RANDOM(randp->random_data, SCTP_AUTH_RANDOM_SIZE_DEFAULT);
5983                 padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
5984                 chunk_len += parameter_len;
5985
5986                 if (padding_len > 0) {
5987                         memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
5988                         chunk_len += padding_len;
5989                         padding_len = 0;
5990                 }
5991                 /* add HMAC_ALGO parameter */
5992                 hmacs = (struct sctp_auth_hmac_algo *)(mtod(m, caddr_t)+chunk_len);
5993                 parameter_len = (uint16_t)sizeof(struct sctp_auth_hmac_algo) +
5994                     sctp_serialize_hmaclist(inp->sctp_ep.local_hmacs,
5995                     (uint8_t *)hmacs->hmac_ids);
5996                 hmacs->ph.param_type = htons(SCTP_HMAC_LIST);
5997                 hmacs->ph.param_length = htons(parameter_len);
5998                 padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
5999                 chunk_len += parameter_len;
6000
6001                 if (padding_len > 0) {
6002                         memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
6003                         chunk_len += padding_len;
6004                         padding_len = 0;
6005                 }
6006                 /* add CHUNKS parameter */
6007                 chunks = (struct sctp_auth_chunk_list *)(mtod(m, caddr_t)+chunk_len);
6008                 parameter_len = (uint16_t)sizeof(struct sctp_auth_chunk_list) +
6009                     sctp_serialize_auth_chunks(inp->sctp_ep.local_auth_chunks,
6010                     chunks->chunk_types);
6011                 chunks->ph.param_type = htons(SCTP_CHUNK_LIST);
6012                 chunks->ph.param_length = htons(parameter_len);
6013                 padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
6014                 chunk_len += parameter_len;
6015         }
6016         SCTP_BUF_LEN(m) = chunk_len;
6017         m_last = m;
6018         /* now the addresses */
6019         /*
6020          * To optimize this we could put the scoping stuff into a structure
6021          * and remove the individual uint8's from the stc structure. Then we
6022          * could just sifa in the address within the stc.. but for now this
6023          * is a quick hack to get the address stuff teased apart.
6024          */
6025         scp.ipv4_addr_legal = stc.ipv4_addr_legal;
6026         scp.ipv6_addr_legal = stc.ipv6_addr_legal;
6027         scp.loopback_scope = stc.loopback_scope;
6028         scp.ipv4_local_scope = stc.ipv4_scope;
6029         scp.local_scope = stc.local_scope;
6030         scp.site_scope = stc.site_scope;
6031         m_last = sctp_add_addresses_to_i_ia(inp, stcb, &scp, m_last,
6032             cnt_inits_to,
6033             &padding_len, &chunk_len);
6034         /* padding_len can only be positive, if no addresses have been added */
6035         if (padding_len > 0) {
6036                 memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
6037                 chunk_len += padding_len;
6038                 SCTP_BUF_LEN(m) += padding_len;
6039                 padding_len = 0;
6040         }
6041
6042         /* tack on the operational error if present */
6043         if (op_err) {
6044                 parameter_len = 0;
6045                 for (m_tmp = op_err; m_tmp != NULL; m_tmp = SCTP_BUF_NEXT(m_tmp)) {
6046                         parameter_len += SCTP_BUF_LEN(m_tmp);
6047                 }
6048                 padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
6049                 SCTP_BUF_NEXT(m_last) = op_err;
6050                 while (SCTP_BUF_NEXT(m_last) != NULL) {
6051                         m_last = SCTP_BUF_NEXT(m_last);
6052                 }
6053                 chunk_len += parameter_len;
6054         }
6055         if (padding_len > 0) {
6056                 m_last = sctp_add_pad_tombuf(m_last, padding_len);
6057                 if (m_last == NULL) {
6058                         /* Houston we have a problem, no space */
6059                         sctp_m_freem(m);
6060                         return;
6061                 }
6062                 chunk_len += padding_len;
6063                 padding_len = 0;
6064         }
6065         /* Now we must build a cookie */
6066         m_cookie = sctp_add_cookie(init_pkt, offset, m, 0, &stc, &signature);
6067         if (m_cookie == NULL) {
6068                 /* memory problem */
6069                 sctp_m_freem(m);
6070                 return;
6071         }
6072         /* Now append the cookie to the end and update the space/size */
6073         SCTP_BUF_NEXT(m_last) = m_cookie;
6074         parameter_len = 0;
6075         for (m_tmp = m_cookie; m_tmp != NULL; m_tmp = SCTP_BUF_NEXT(m_tmp)) {
6076                 parameter_len += SCTP_BUF_LEN(m_tmp);
6077                 if (SCTP_BUF_NEXT(m_tmp) == NULL) {
6078                         m_last = m_tmp;
6079                 }
6080         }
6081         padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
6082         chunk_len += parameter_len;
6083
6084         /*
6085          * Place in the size, but we don't include the last pad (if any) in
6086          * the INIT-ACK.
6087          */
6088         initack->ch.chunk_length = htons(chunk_len);
6089
6090         /*
6091          * Time to sign the cookie, we don't sign over the cookie signature
6092          * though thus we set trailer.
6093          */
6094         (void)sctp_hmac_m(SCTP_HMAC,
6095             (uint8_t *)inp->sctp_ep.secret_key[(int)(inp->sctp_ep.current_secret_number)],
6096             SCTP_SECRET_SIZE, m_cookie, sizeof(struct sctp_paramhdr),
6097             (uint8_t *)signature, SCTP_SIGNATURE_SIZE);
6098         /*
6099          * We sifa 0 here to NOT set IP_DF if its IPv4, we ignore the return
6100          * here since the timer will drive a retranmission.
6101          */
6102         if (padding_len > 0) {
6103                 if (sctp_add_pad_tombuf(m_last, padding_len) == NULL) {
6104                         sctp_m_freem(m);
6105                         return;
6106                 }
6107         }
6108         if (stc.loopback_scope) {
6109                 over_addr = (union sctp_sockstore *)dst;
6110         } else {
6111                 over_addr = NULL;
6112         }
6113
6114         if ((error = sctp_lowlevel_chunk_output(inp, NULL, NULL, to, m, 0, NULL, 0, 0,
6115             0, 0,
6116             inp->sctp_lport, sh->src_port, init_chk->init.initiate_tag,
6117             port, over_addr,
6118             mflowtype, mflowid,
6119             SCTP_SO_NOT_LOCKED))) {
6120                 SCTPDBG(SCTP_DEBUG_OUTPUT4, "Gak send error %d\n", error);
6121                 if (error == ENOBUFS) {
6122                         if (asoc != NULL) {
6123                                 asoc->ifp_had_enobuf = 1;
6124                         }
6125                         SCTP_STAT_INCR(sctps_lowlevelerr);
6126                 }
6127         } else {
6128                 if (asoc != NULL) {
6129                         asoc->ifp_had_enobuf = 0;
6130                 }
6131         }
6132         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
6133 }
6134
6135 static void
6136 sctp_prune_prsctp(struct sctp_tcb *stcb,
6137     struct sctp_association *asoc,
6138     struct sctp_sndrcvinfo *srcv,
6139     int dataout)
6140 {
6141         int freed_spc = 0;
6142         struct sctp_tmit_chunk *chk, *nchk;
6143
6144         SCTP_TCB_LOCK_ASSERT(stcb);
6145         if ((asoc->prsctp_supported) &&
6146             (asoc->sent_queue_cnt_removeable > 0)) {
6147                 TAILQ_FOREACH(chk, &asoc->sent_queue, sctp_next) {
6148                         /*
6149                          * Look for chunks marked with the PR_SCTP flag AND
6150                          * the buffer space flag. If the one being sent is
6151                          * equal or greater priority then purge the old one
6152                          * and free some space.
6153                          */
6154                         if (PR_SCTP_BUF_ENABLED(chk->flags)) {
6155                                 /*
6156                                  * This one is PR-SCTP AND buffer space
6157                                  * limited type
6158                                  */
6159                                 if (chk->rec.data.timetodrop.tv_sec > (long)srcv->sinfo_timetolive) {
6160                                         /*
6161                                          * Lower numbers equates to higher
6162                                          * priority. So if the one we are
6163                                          * looking at has a larger priority,
6164                                          * we want to drop the data and NOT
6165                                          * retransmit it.
6166                                          */
6167                                         if (chk->data) {
6168                                                 /*
6169                                                  * We release the book_size
6170                                                  * if the mbuf is here
6171                                                  */
6172                                                 int ret_spc;
6173                                                 uint8_t sent;
6174
6175                                                 if (chk->sent > SCTP_DATAGRAM_UNSENT)
6176                                                         sent = 1;
6177                                                 else
6178                                                         sent = 0;
6179                                                 ret_spc = sctp_release_pr_sctp_chunk(stcb, chk,
6180                                                     sent,
6181                                                     SCTP_SO_LOCKED);
6182                                                 freed_spc += ret_spc;
6183                                                 if (freed_spc >= dataout) {
6184                                                         return;
6185                                                 }
6186                                         }       /* if chunk was present */
6187                                 }       /* if of sufficient priority */
6188                         }       /* if chunk has enabled */
6189                 }               /* tailqforeach */
6190
6191                 TAILQ_FOREACH_SAFE(chk, &asoc->send_queue, sctp_next, nchk) {
6192                         /* Here we must move to the sent queue and mark */
6193                         if (PR_SCTP_BUF_ENABLED(chk->flags)) {
6194                                 if (chk->rec.data.timetodrop.tv_sec > (long)srcv->sinfo_timetolive) {
6195                                         if (chk->data) {
6196                                                 /*
6197                                                  * We release the book_size
6198                                                  * if the mbuf is here
6199                                                  */
6200                                                 int ret_spc;
6201
6202                                                 ret_spc = sctp_release_pr_sctp_chunk(stcb, chk,
6203                                                     0, SCTP_SO_LOCKED);
6204
6205                                                 freed_spc += ret_spc;
6206                                                 if (freed_spc >= dataout) {
6207                                                         return;
6208                                                 }
6209                                         }       /* end if chk->data */
6210                                 }       /* end if right class */
6211                         }       /* end if chk pr-sctp */
6212                 }               /* tailqforeachsafe (chk) */
6213         }                       /* if enabled in asoc */
6214 }
6215
6216 int
6217 sctp_get_frag_point(struct sctp_tcb *stcb,
6218     struct sctp_association *asoc)
6219 {
6220         int siz, ovh;
6221
6222         /*
6223          * For endpoints that have both v6 and v4 addresses we must reserve
6224          * room for the ipv6 header, for those that are only dealing with V4
6225          * we use a larger frag point.
6226          */
6227         if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
6228                 ovh = SCTP_MIN_OVERHEAD;
6229         } else {
6230                 ovh = SCTP_MIN_V4_OVERHEAD;
6231         }
6232         ovh += SCTP_DATA_CHUNK_OVERHEAD(stcb);
6233         if (stcb->asoc.sctp_frag_point > asoc->smallest_mtu)
6234                 siz = asoc->smallest_mtu - ovh;
6235         else
6236                 siz = (stcb->asoc.sctp_frag_point - ovh);
6237         /*
6238          * if (siz > (MCLBYTES-sizeof(struct sctp_data_chunk))) {
6239          */
6240         /* A data chunk MUST fit in a cluster */
6241         /* siz = (MCLBYTES - sizeof(struct sctp_data_chunk)); */
6242         /* } */
6243
6244         /* adjust for an AUTH chunk if DATA requires auth */
6245         if (sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks))
6246                 siz -= sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
6247
6248         if (siz % 4) {
6249                 /* make it an even word boundary please */
6250                 siz -= (siz % 4);
6251         }
6252         return (siz);
6253 }
6254
6255 static void
6256 sctp_set_prsctp_policy(struct sctp_stream_queue_pending *sp)
6257 {
6258         /*
6259          * We assume that the user wants PR_SCTP_TTL if the user provides a
6260          * positive lifetime but does not specify any PR_SCTP policy.
6261          */
6262         if (PR_SCTP_ENABLED(sp->sinfo_flags)) {
6263                 sp->act_flags |= PR_SCTP_POLICY(sp->sinfo_flags);
6264         } else if (sp->timetolive > 0) {
6265                 sp->sinfo_flags |= SCTP_PR_SCTP_TTL;
6266                 sp->act_flags |= PR_SCTP_POLICY(sp->sinfo_flags);
6267         } else {
6268                 return;
6269         }
6270         switch (PR_SCTP_POLICY(sp->sinfo_flags)) {
6271         case CHUNK_FLAGS_PR_SCTP_BUF:
6272                 /*
6273                  * Time to live is a priority stored in tv_sec when doing
6274                  * the buffer drop thing.
6275                  */
6276                 sp->ts.tv_sec = sp->timetolive;
6277                 sp->ts.tv_usec = 0;
6278                 break;
6279         case CHUNK_FLAGS_PR_SCTP_TTL:
6280                 {
6281                         struct timeval tv;
6282
6283                         (void)SCTP_GETTIME_TIMEVAL(&sp->ts);
6284                         tv.tv_sec = sp->timetolive / 1000;
6285                         tv.tv_usec = (sp->timetolive * 1000) % 1000000;
6286                         /*
6287                          * TODO sctp_constants.h needs alternative time
6288                          * macros when _KERNEL is undefined.
6289                          */
6290                         timevaladd(&sp->ts, &tv);
6291                 }
6292                 break;
6293         case CHUNK_FLAGS_PR_SCTP_RTX:
6294                 /*
6295                  * Time to live is a the number or retransmissions stored in
6296                  * tv_sec.
6297                  */
6298                 sp->ts.tv_sec = sp->timetolive;
6299                 sp->ts.tv_usec = 0;
6300                 break;
6301         default:
6302                 SCTPDBG(SCTP_DEBUG_USRREQ1,
6303                     "Unknown PR_SCTP policy %u.\n",
6304                     PR_SCTP_POLICY(sp->sinfo_flags));
6305                 break;
6306         }
6307 }
6308
6309 static int
6310 sctp_msg_append(struct sctp_tcb *stcb,
6311     struct sctp_nets *net,
6312     struct mbuf *m,
6313     struct sctp_sndrcvinfo *srcv, int hold_stcb_lock)
6314 {
6315         int error = 0;
6316         struct mbuf *at;
6317         struct sctp_stream_queue_pending *sp = NULL;
6318         struct sctp_stream_out *strm;
6319
6320         /*
6321          * Given an mbuf chain, put it into the association send queue and
6322          * place it on the wheel
6323          */
6324         if (srcv->sinfo_stream >= stcb->asoc.streamoutcnt) {
6325                 /* Invalid stream number */
6326                 SCTP_LTRACE_ERR_RET_PKT(m, NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
6327                 error = EINVAL;
6328                 goto out_now;
6329         }
6330         if ((stcb->asoc.stream_locked) &&
6331             (stcb->asoc.stream_locked_on != srcv->sinfo_stream)) {
6332                 SCTP_LTRACE_ERR_RET_PKT(m, NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
6333                 error = EINVAL;
6334                 goto out_now;
6335         }
6336         strm = &stcb->asoc.strmout[srcv->sinfo_stream];
6337         /* Now can we send this? */
6338         if ((SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_SENT) ||
6339             (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_ACK_SENT) ||
6340             (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_RECEIVED) ||
6341             (stcb->asoc.state & SCTP_STATE_SHUTDOWN_PENDING)) {
6342                 /* got data while shutting down */
6343                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
6344                 error = ECONNRESET;
6345                 goto out_now;
6346         }
6347         sctp_alloc_a_strmoq(stcb, sp);
6348         if (sp == NULL) {
6349                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
6350                 error = ENOMEM;
6351                 goto out_now;
6352         }
6353         sp->sinfo_flags = srcv->sinfo_flags;
6354         sp->timetolive = srcv->sinfo_timetolive;
6355         sp->ppid = srcv->sinfo_ppid;
6356         sp->context = srcv->sinfo_context;
6357         sp->fsn = 0;
6358         if (sp->sinfo_flags & SCTP_ADDR_OVER) {
6359                 sp->net = net;
6360                 atomic_add_int(&sp->net->ref_count, 1);
6361         } else {
6362                 sp->net = NULL;
6363         }
6364         (void)SCTP_GETTIME_TIMEVAL(&sp->ts);
6365         sp->sid = srcv->sinfo_stream;
6366         sp->msg_is_complete = 1;
6367         sp->sender_all_done = 1;
6368         sp->some_taken = 0;
6369         sp->data = m;
6370         sp->tail_mbuf = NULL;
6371         sctp_set_prsctp_policy(sp);
6372         /*
6373          * We could in theory (for sendall) sifa the length in, but we would
6374          * still have to hunt through the chain since we need to setup the
6375          * tail_mbuf
6376          */
6377         sp->length = 0;
6378         for (at = m; at; at = SCTP_BUF_NEXT(at)) {
6379                 if (SCTP_BUF_NEXT(at) == NULL)
6380                         sp->tail_mbuf = at;
6381                 sp->length += SCTP_BUF_LEN(at);
6382         }
6383         if (srcv->sinfo_keynumber_valid) {
6384                 sp->auth_keyid = srcv->sinfo_keynumber;
6385         } else {
6386                 sp->auth_keyid = stcb->asoc.authinfo.active_keyid;
6387         }
6388         if (sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks)) {
6389                 sctp_auth_key_acquire(stcb, sp->auth_keyid);
6390                 sp->holds_key_ref = 1;
6391         }
6392         if (hold_stcb_lock == 0) {
6393                 SCTP_TCB_SEND_LOCK(stcb);
6394         }
6395         sctp_snd_sb_alloc(stcb, sp->length);
6396         atomic_add_int(&stcb->asoc.stream_queue_cnt, 1);
6397         TAILQ_INSERT_TAIL(&strm->outqueue, sp, next);
6398         stcb->asoc.ss_functions.sctp_ss_add_to_stream(stcb, &stcb->asoc, strm, sp, 1);
6399         m = NULL;
6400         if (hold_stcb_lock == 0) {
6401                 SCTP_TCB_SEND_UNLOCK(stcb);
6402         }
6403 out_now:
6404         if (m) {
6405                 sctp_m_freem(m);
6406         }
6407         return (error);
6408 }
6409
6410 static struct mbuf *
6411 sctp_copy_mbufchain(struct mbuf *clonechain,
6412     struct mbuf *outchain,
6413     struct mbuf **endofchain,
6414     int can_take_mbuf,
6415     int sizeofcpy,
6416     uint8_t copy_by_ref)
6417 {
6418         struct mbuf *m;
6419         struct mbuf *appendchain;
6420         caddr_t cp;
6421         int len;
6422
6423         if (endofchain == NULL) {
6424                 /* error */
6425 error_out:
6426                 if (outchain)
6427                         sctp_m_freem(outchain);
6428                 return (NULL);
6429         }
6430         if (can_take_mbuf) {
6431                 appendchain = clonechain;
6432         } else {
6433                 if (!copy_by_ref &&
6434                     (sizeofcpy <= (int)((((SCTP_BASE_SYSCTL(sctp_mbuf_threshold_count) - 1) * MLEN) + MHLEN)))) {
6435                         /* Its not in a cluster */
6436                         if (*endofchain == NULL) {
6437                                 /* lets get a mbuf cluster */
6438                                 if (outchain == NULL) {
6439                                         /* This is the general case */
6440                         new_mbuf:
6441                                         outchain = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_HEADER);
6442                                         if (outchain == NULL) {
6443                                                 goto error_out;
6444                                         }
6445                                         SCTP_BUF_LEN(outchain) = 0;
6446                                         *endofchain = outchain;
6447                                         /* get the prepend space */
6448                                         SCTP_BUF_RESV_UF(outchain, (SCTP_FIRST_MBUF_RESV + 4));
6449                                 } else {
6450                                         /*
6451                                          * We really should not get a NULL
6452                                          * in endofchain
6453                                          */
6454                                         /* find end */
6455                                         m = outchain;
6456                                         while (m) {
6457                                                 if (SCTP_BUF_NEXT(m) == NULL) {
6458                                                         *endofchain = m;
6459                                                         break;
6460                                                 }
6461                                                 m = SCTP_BUF_NEXT(m);
6462                                         }
6463                                         /* sanity */
6464                                         if (*endofchain == NULL) {
6465                                                 /*
6466                                                  * huh, TSNH XXX maybe we
6467                                                  * should panic
6468                                                  */
6469                                                 sctp_m_freem(outchain);
6470                                                 goto new_mbuf;
6471                                         }
6472                                 }
6473                                 /* get the new end of length */
6474                                 len = (int)M_TRAILINGSPACE(*endofchain);
6475                         } else {
6476                                 /* how much is left at the end? */
6477                                 len = (int)M_TRAILINGSPACE(*endofchain);
6478                         }
6479                         /* Find the end of the data, for appending */
6480                         cp = (mtod((*endofchain), caddr_t)+SCTP_BUF_LEN((*endofchain)));
6481
6482                         /* Now lets copy it out */
6483                         if (len >= sizeofcpy) {
6484                                 /* It all fits, copy it in */
6485                                 m_copydata(clonechain, 0, sizeofcpy, cp);
6486                                 SCTP_BUF_LEN((*endofchain)) += sizeofcpy;
6487                         } else {
6488                                 /* fill up the end of the chain */
6489                                 if (len > 0) {
6490                                         m_copydata(clonechain, 0, len, cp);
6491                                         SCTP_BUF_LEN((*endofchain)) += len;
6492                                         /* now we need another one */
6493                                         sizeofcpy -= len;
6494                                 }
6495                                 m = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_HEADER);
6496                                 if (m == NULL) {
6497                                         /* We failed */
6498                                         goto error_out;
6499                                 }
6500                                 SCTP_BUF_NEXT((*endofchain)) = m;
6501                                 *endofchain = m;
6502                                 cp = mtod((*endofchain), caddr_t);
6503                                 m_copydata(clonechain, len, sizeofcpy, cp);
6504                                 SCTP_BUF_LEN((*endofchain)) += sizeofcpy;
6505                         }
6506                         return (outchain);
6507                 } else {
6508                         /* copy the old fashion way */
6509                         appendchain = SCTP_M_COPYM(clonechain, 0, M_COPYALL, M_NOWAIT);
6510 #ifdef SCTP_MBUF_LOGGING
6511                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
6512                                 sctp_log_mbc(appendchain, SCTP_MBUF_ICOPY);
6513                         }
6514 #endif
6515                 }
6516         }
6517         if (appendchain == NULL) {
6518                 /* error */
6519                 if (outchain)
6520                         sctp_m_freem(outchain);
6521                 return (NULL);
6522         }
6523         if (outchain) {
6524                 /* tack on to the end */
6525                 if (*endofchain != NULL) {
6526                         SCTP_BUF_NEXT(((*endofchain))) = appendchain;
6527                 } else {
6528                         m = outchain;
6529                         while (m) {
6530                                 if (SCTP_BUF_NEXT(m) == NULL) {
6531                                         SCTP_BUF_NEXT(m) = appendchain;
6532                                         break;
6533                                 }
6534                                 m = SCTP_BUF_NEXT(m);
6535                         }
6536                 }
6537                 /*
6538                  * save off the end and update the end-chain position
6539                  */
6540                 m = appendchain;
6541                 while (m) {
6542                         if (SCTP_BUF_NEXT(m) == NULL) {
6543                                 *endofchain = m;
6544                                 break;
6545                         }
6546                         m = SCTP_BUF_NEXT(m);
6547                 }
6548                 return (outchain);
6549         } else {
6550                 /* save off the end and update the end-chain position */
6551                 m = appendchain;
6552                 while (m) {
6553                         if (SCTP_BUF_NEXT(m) == NULL) {
6554                                 *endofchain = m;
6555                                 break;
6556                         }
6557                         m = SCTP_BUF_NEXT(m);
6558                 }
6559                 return (appendchain);
6560         }
6561 }
6562
6563 static int
6564 sctp_med_chunk_output(struct sctp_inpcb *inp,
6565     struct sctp_tcb *stcb,
6566     struct sctp_association *asoc,
6567     int *num_out,
6568     int *reason_code,
6569     int control_only, int from_where,
6570     struct timeval *now, int *now_filled, int frag_point, int so_locked);
6571
6572 static void
6573 sctp_sendall_iterator(struct sctp_inpcb *inp, struct sctp_tcb *stcb, void *ptr,
6574     uint32_t val SCTP_UNUSED)
6575 {
6576         struct sctp_copy_all *ca;
6577         struct mbuf *m;
6578         int ret = 0;
6579         int added_control = 0;
6580         int un_sent, do_chunk_output = 1;
6581         struct sctp_association *asoc;
6582         struct sctp_nets *net;
6583
6584         ca = (struct sctp_copy_all *)ptr;
6585         if (ca->m == NULL) {
6586                 return;
6587         }
6588         if (ca->inp != inp) {
6589                 /* TSNH */
6590                 return;
6591         }
6592         if (ca->sndlen > 0) {
6593                 m = SCTP_M_COPYM(ca->m, 0, M_COPYALL, M_NOWAIT);
6594                 if (m == NULL) {
6595                         /* can't copy so we are done */
6596                         ca->cnt_failed++;
6597                         return;
6598                 }
6599 #ifdef SCTP_MBUF_LOGGING
6600                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
6601                         sctp_log_mbc(m, SCTP_MBUF_ICOPY);
6602                 }
6603 #endif
6604         } else {
6605                 m = NULL;
6606         }
6607         SCTP_TCB_LOCK_ASSERT(stcb);
6608         if (stcb->asoc.alternate) {
6609                 net = stcb->asoc.alternate;
6610         } else {
6611                 net = stcb->asoc.primary_destination;
6612         }
6613         if (ca->sndrcv.sinfo_flags & SCTP_ABORT) {
6614                 /* Abort this assoc with m as the user defined reason */
6615                 if (m != NULL) {
6616                         SCTP_BUF_PREPEND(m, sizeof(struct sctp_paramhdr), M_NOWAIT);
6617                 } else {
6618                         m = sctp_get_mbuf_for_msg(sizeof(struct sctp_paramhdr),
6619                             0, M_NOWAIT, 1, MT_DATA);
6620                         SCTP_BUF_LEN(m) = sizeof(struct sctp_paramhdr);
6621                 }
6622                 if (m != NULL) {
6623                         struct sctp_paramhdr *ph;
6624
6625                         ph = mtod(m, struct sctp_paramhdr *);
6626                         ph->param_type = htons(SCTP_CAUSE_USER_INITIATED_ABT);
6627                         ph->param_length = htons((uint16_t)(sizeof(struct sctp_paramhdr) + ca->sndlen));
6628                 }
6629                 /*
6630                  * We add one here to keep the assoc from dis-appearing on
6631                  * us.
6632                  */
6633                 atomic_add_int(&stcb->asoc.refcnt, 1);
6634                 sctp_abort_an_association(inp, stcb, m, false, SCTP_SO_NOT_LOCKED);
6635                 /*
6636                  * sctp_abort_an_association calls sctp_free_asoc() free
6637                  * association will NOT free it since we incremented the
6638                  * refcnt .. we do this to prevent it being freed and things
6639                  * getting tricky since we could end up (from free_asoc)
6640                  * calling inpcb_free which would get a recursive lock call
6641                  * to the iterator lock.. But as a consequence of that the
6642                  * stcb will return to us un-locked.. since free_asoc
6643                  * returns with either no TCB or the TCB unlocked, we must
6644                  * relock.. to unlock in the iterator timer :-0
6645                  */
6646                 SCTP_TCB_LOCK(stcb);
6647                 atomic_add_int(&stcb->asoc.refcnt, -1);
6648                 goto no_chunk_output;
6649         } else {
6650                 if (m) {
6651                         ret = sctp_msg_append(stcb, net, m,
6652                             &ca->sndrcv, 1);
6653                 }
6654                 asoc = &stcb->asoc;
6655                 if (ca->sndrcv.sinfo_flags & SCTP_EOF) {
6656                         /* shutdown this assoc */
6657                         if (TAILQ_EMPTY(&asoc->send_queue) &&
6658                             TAILQ_EMPTY(&asoc->sent_queue) &&
6659                             sctp_is_there_unsent_data(stcb, SCTP_SO_NOT_LOCKED) == 0) {
6660                                 if ((*asoc->ss_functions.sctp_ss_is_user_msgs_incomplete) (stcb, asoc)) {
6661                                         goto abort_anyway;
6662                                 }
6663                                 /*
6664                                  * there is nothing queued to send, so I'm
6665                                  * done...
6666                                  */
6667                                 if ((SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_SENT) &&
6668                                     (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
6669                                     (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
6670                                         /*
6671                                          * only send SHUTDOWN the first time
6672                                          * through
6673                                          */
6674                                         if (SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) {
6675                                                 SCTP_STAT_DECR_GAUGE32(sctps_currestab);
6676                                         }
6677                                         SCTP_SET_STATE(stcb, SCTP_STATE_SHUTDOWN_SENT);
6678                                         sctp_stop_timers_for_shutdown(stcb);
6679                                         sctp_send_shutdown(stcb, net);
6680                                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb,
6681                                             net);
6682                                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
6683                                             NULL);
6684                                         added_control = 1;
6685                                         do_chunk_output = 0;
6686                                 }
6687                         } else {
6688                                 /*
6689                                  * we still got (or just got) data to send,
6690                                  * so set SHUTDOWN_PENDING
6691                                  */
6692                                 /*
6693                                  * XXX sockets draft says that SCTP_EOF
6694                                  * should be sent with no data.  currently,
6695                                  * we will allow user data to be sent first
6696                                  * and move to SHUTDOWN-PENDING
6697                                  */
6698                                 if ((SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_SENT) &&
6699                                     (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
6700                                     (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
6701                                         if ((*asoc->ss_functions.sctp_ss_is_user_msgs_incomplete) (stcb, asoc)) {
6702                                                 SCTP_ADD_SUBSTATE(stcb, SCTP_STATE_PARTIAL_MSG_LEFT);
6703                                         }
6704                                         SCTP_ADD_SUBSTATE(stcb, SCTP_STATE_SHUTDOWN_PENDING);
6705                                         if (TAILQ_EMPTY(&asoc->send_queue) &&
6706                                             TAILQ_EMPTY(&asoc->sent_queue) &&
6707                                             (asoc->state & SCTP_STATE_PARTIAL_MSG_LEFT)) {
6708                                                 struct mbuf *op_err;
6709                                                 char msg[SCTP_DIAG_INFO_LEN];
6710
6711                                 abort_anyway:
6712                                                 SCTP_SNPRINTF(msg, sizeof(msg),
6713                                                     "%s:%d at %s", __FILE__, __LINE__, __func__);
6714                                                 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
6715                                                     msg);
6716                                                 atomic_add_int(&stcb->asoc.refcnt, 1);
6717                                                 sctp_abort_an_association(stcb->sctp_ep, stcb,
6718                                                     op_err, false, SCTP_SO_NOT_LOCKED);
6719                                                 atomic_add_int(&stcb->asoc.refcnt, -1);
6720                                                 goto no_chunk_output;
6721                                         }
6722                                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
6723                                             NULL);
6724                                 }
6725                         }
6726                 }
6727         }
6728         un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
6729             (stcb->asoc.stream_queue_cnt * SCTP_DATA_CHUNK_OVERHEAD(stcb)));
6730
6731         if ((sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY)) &&
6732             (stcb->asoc.total_flight > 0) &&
6733             (un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD))) {
6734                 do_chunk_output = 0;
6735         }
6736         if (do_chunk_output)
6737                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_NOT_LOCKED);
6738         else if (added_control) {
6739                 int num_out, reason, now_filled = 0;
6740                 struct timeval now;
6741                 int frag_point;
6742
6743                 frag_point = sctp_get_frag_point(stcb, &stcb->asoc);
6744                 (void)sctp_med_chunk_output(inp, stcb, &stcb->asoc, &num_out,
6745                     &reason, 1, 1, &now, &now_filled, frag_point, SCTP_SO_NOT_LOCKED);
6746         }
6747 no_chunk_output:
6748         if (ret) {
6749                 ca->cnt_failed++;
6750         } else {
6751                 ca->cnt_sent++;
6752         }
6753 }
6754
6755 static void
6756 sctp_sendall_completes(void *ptr, uint32_t val SCTP_UNUSED)
6757 {
6758         struct sctp_copy_all *ca;
6759
6760         ca = (struct sctp_copy_all *)ptr;
6761         /*
6762          * Do a notify here? Kacheong suggests that the notify be done at
6763          * the send time.. so you would push up a notification if any send
6764          * failed. Don't know if this is feasible since the only failures we
6765          * have is "memory" related and if you cannot get an mbuf to send
6766          * the data you surely can't get an mbuf to send up to notify the
6767          * user you can't send the data :->
6768          */
6769
6770         /* now free everything */
6771         if (ca->inp) {
6772                 /* Lets clear the flag to allow others to run. */
6773                 ca->inp->sctp_flags &= ~SCTP_PCB_FLAGS_SND_ITERATOR_UP;
6774         }
6775         sctp_m_freem(ca->m);
6776         SCTP_FREE(ca, SCTP_M_COPYAL);
6777 }
6778
6779 static struct mbuf *
6780 sctp_copy_out_all(struct uio *uio, ssize_t len)
6781 {
6782         struct mbuf *ret, *at;
6783         ssize_t left, willcpy, cancpy, error;
6784
6785         ret = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_WAITOK, 1, MT_DATA);
6786         if (ret == NULL) {
6787                 /* TSNH */
6788                 return (NULL);
6789         }
6790         left = len;
6791         SCTP_BUF_LEN(ret) = 0;
6792         /* save space for the data chunk header */
6793         cancpy = (int)M_TRAILINGSPACE(ret);
6794         willcpy = min(cancpy, left);
6795         at = ret;
6796         while (left > 0) {
6797                 /* Align data to the end */
6798                 error = uiomove(mtod(at, caddr_t), (int)willcpy, uio);
6799                 if (error) {
6800         err_out_now:
6801                         sctp_m_freem(at);
6802                         return (NULL);
6803                 }
6804                 SCTP_BUF_LEN(at) = (int)willcpy;
6805                 SCTP_BUF_NEXT_PKT(at) = SCTP_BUF_NEXT(at) = 0;
6806                 left -= willcpy;
6807                 if (left > 0) {
6808                         SCTP_BUF_NEXT(at) = sctp_get_mbuf_for_msg((unsigned int)left, 0, M_WAITOK, 1, MT_DATA);
6809                         if (SCTP_BUF_NEXT(at) == NULL) {
6810                                 goto err_out_now;
6811                         }
6812                         at = SCTP_BUF_NEXT(at);
6813                         SCTP_BUF_LEN(at) = 0;
6814                         cancpy = (int)M_TRAILINGSPACE(at);
6815                         willcpy = min(cancpy, left);
6816                 }
6817         }
6818         return (ret);
6819 }
6820
6821 static int
6822 sctp_sendall(struct sctp_inpcb *inp, struct uio *uio, struct mbuf *m,
6823     struct sctp_sndrcvinfo *srcv)
6824 {
6825         int ret;
6826         struct sctp_copy_all *ca;
6827
6828         if (inp->sctp_flags & SCTP_PCB_FLAGS_SND_ITERATOR_UP) {
6829                 /* There is another. */
6830                 return (EBUSY);
6831         }
6832         if (uio->uio_resid > (ssize_t)SCTP_BASE_SYSCTL(sctp_sendall_limit)) {
6833                 /* You must not be larger than the limit! */
6834                 return (EMSGSIZE);
6835         }
6836         SCTP_MALLOC(ca, struct sctp_copy_all *, sizeof(struct sctp_copy_all),
6837             SCTP_M_COPYAL);
6838         if (ca == NULL) {
6839                 sctp_m_freem(m);
6840                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
6841                 return (ENOMEM);
6842         }
6843         memset(ca, 0, sizeof(struct sctp_copy_all));
6844
6845         ca->inp = inp;
6846         if (srcv) {
6847                 memcpy(&ca->sndrcv, srcv, sizeof(struct sctp_nonpad_sndrcvinfo));
6848         }
6849         /*
6850          * take off the sendall flag, it would be bad if we failed to do
6851          * this :-0
6852          */
6853         ca->sndrcv.sinfo_flags &= ~SCTP_SENDALL;
6854         /* get length and mbuf chain */
6855         if (uio) {
6856                 ca->sndlen = uio->uio_resid;
6857                 ca->m = sctp_copy_out_all(uio, ca->sndlen);
6858                 if (ca->m == NULL) {
6859                         SCTP_FREE(ca, SCTP_M_COPYAL);
6860                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
6861                         return (ENOMEM);
6862                 }
6863         } else {
6864                 /* Gather the length of the send */
6865                 struct mbuf *mat;
6866
6867                 ca->sndlen = 0;
6868                 for (mat = m; mat; mat = SCTP_BUF_NEXT(mat)) {
6869                         ca->sndlen += SCTP_BUF_LEN(mat);
6870                 }
6871         }
6872         inp->sctp_flags |= SCTP_PCB_FLAGS_SND_ITERATOR_UP;
6873         ret = sctp_initiate_iterator(NULL, sctp_sendall_iterator, NULL,
6874             SCTP_PCB_ANY_FLAGS, SCTP_PCB_ANY_FEATURES,
6875             SCTP_ASOC_ANY_STATE,
6876             (void *)ca, 0,
6877             sctp_sendall_completes, inp, 1);
6878         if (ret) {
6879                 inp->sctp_flags &= ~SCTP_PCB_FLAGS_SND_ITERATOR_UP;
6880                 SCTP_FREE(ca, SCTP_M_COPYAL);
6881                 SCTP_LTRACE_ERR_RET_PKT(m, inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EFAULT);
6882                 return (EFAULT);
6883         }
6884         return (0);
6885 }
6886
6887 void
6888 sctp_toss_old_cookies(struct sctp_tcb *stcb, struct sctp_association *asoc)
6889 {
6890         struct sctp_tmit_chunk *chk, *nchk;
6891
6892         TAILQ_FOREACH_SAFE(chk, &asoc->control_send_queue, sctp_next, nchk) {
6893                 if (chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
6894                         TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
6895                         asoc->ctrl_queue_cnt--;
6896                         if (chk->data) {
6897                                 sctp_m_freem(chk->data);
6898                                 chk->data = NULL;
6899                         }
6900                         sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
6901                 }
6902         }
6903 }
6904
6905 void
6906 sctp_toss_old_asconf(struct sctp_tcb *stcb)
6907 {
6908         struct sctp_association *asoc;
6909         struct sctp_tmit_chunk *chk, *nchk;
6910         struct sctp_asconf_chunk *acp;
6911
6912         asoc = &stcb->asoc;
6913         TAILQ_FOREACH_SAFE(chk, &asoc->asconf_send_queue, sctp_next, nchk) {
6914                 /* find SCTP_ASCONF chunk in queue */
6915                 if (chk->rec.chunk_id.id == SCTP_ASCONF) {
6916                         if (chk->data) {
6917                                 acp = mtod(chk->data, struct sctp_asconf_chunk *);
6918                                 if (SCTP_TSN_GT(ntohl(acp->serial_number), asoc->asconf_seq_out_acked)) {
6919                                         /* Not Acked yet */
6920                                         break;
6921                                 }
6922                         }
6923                         TAILQ_REMOVE(&asoc->asconf_send_queue, chk, sctp_next);
6924                         asoc->ctrl_queue_cnt--;
6925                         if (chk->data) {
6926                                 sctp_m_freem(chk->data);
6927                                 chk->data = NULL;
6928                         }
6929                         sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
6930                 }
6931         }
6932 }
6933
6934 static void
6935 sctp_clean_up_datalist(struct sctp_tcb *stcb,
6936     struct sctp_association *asoc,
6937     struct sctp_tmit_chunk **data_list,
6938     int bundle_at,
6939     struct sctp_nets *net)
6940 {
6941         int i;
6942         struct sctp_tmit_chunk *tp1;
6943
6944         for (i = 0; i < bundle_at; i++) {
6945                 /* off of the send queue */
6946                 TAILQ_REMOVE(&asoc->send_queue, data_list[i], sctp_next);
6947                 asoc->send_queue_cnt--;
6948                 if (i > 0) {
6949                         /*
6950                          * Any chunk NOT 0 you zap the time chunk 0 gets
6951                          * zapped or set based on if a RTO measurment is
6952                          * needed.
6953                          */
6954                         data_list[i]->do_rtt = 0;
6955                 }
6956                 /* record time */
6957                 data_list[i]->sent_rcv_time = net->last_sent_time;
6958                 data_list[i]->rec.data.cwnd_at_send = net->cwnd;
6959                 data_list[i]->rec.data.fast_retran_tsn = data_list[i]->rec.data.tsn;
6960                 if (data_list[i]->whoTo == NULL) {
6961                         data_list[i]->whoTo = net;
6962                         atomic_add_int(&net->ref_count, 1);
6963                 }
6964                 /* on to the sent queue */
6965                 tp1 = TAILQ_LAST(&asoc->sent_queue, sctpchunk_listhead);
6966                 if ((tp1) && SCTP_TSN_GT(tp1->rec.data.tsn, data_list[i]->rec.data.tsn)) {
6967                         struct sctp_tmit_chunk *tpp;
6968
6969                         /* need to move back */
6970         back_up_more:
6971                         tpp = TAILQ_PREV(tp1, sctpchunk_listhead, sctp_next);
6972                         if (tpp == NULL) {
6973                                 TAILQ_INSERT_BEFORE(tp1, data_list[i], sctp_next);
6974                                 goto all_done;
6975                         }
6976                         tp1 = tpp;
6977                         if (SCTP_TSN_GT(tp1->rec.data.tsn, data_list[i]->rec.data.tsn)) {
6978                                 goto back_up_more;
6979                         }
6980                         TAILQ_INSERT_AFTER(&asoc->sent_queue, tp1, data_list[i], sctp_next);
6981                 } else {
6982                         TAILQ_INSERT_TAIL(&asoc->sent_queue,
6983                             data_list[i],
6984                             sctp_next);
6985                 }
6986 all_done:
6987                 /* This does not lower until the cum-ack passes it */
6988                 asoc->sent_queue_cnt++;
6989                 if ((asoc->peers_rwnd <= 0) &&
6990                     (asoc->total_flight == 0) &&
6991                     (bundle_at == 1)) {
6992                         /* Mark the chunk as being a window probe */
6993                         SCTP_STAT_INCR(sctps_windowprobed);
6994                 }
6995 #ifdef SCTP_AUDITING_ENABLED
6996                 sctp_audit_log(0xC2, 3);
6997 #endif
6998                 data_list[i]->sent = SCTP_DATAGRAM_SENT;
6999                 data_list[i]->snd_count = 1;
7000                 data_list[i]->rec.data.chunk_was_revoked = 0;
7001                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
7002                         sctp_misc_ints(SCTP_FLIGHT_LOG_UP,
7003                             data_list[i]->whoTo->flight_size,
7004                             data_list[i]->book_size,
7005                             (uint32_t)(uintptr_t)data_list[i]->whoTo,
7006                             data_list[i]->rec.data.tsn);
7007                 }
7008                 sctp_flight_size_increase(data_list[i]);
7009                 sctp_total_flight_increase(stcb, data_list[i]);
7010                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_RWND_ENABLE) {
7011                         sctp_log_rwnd(SCTP_DECREASE_PEER_RWND,
7012                             asoc->peers_rwnd, data_list[i]->send_size, SCTP_BASE_SYSCTL(sctp_peer_chunk_oh));
7013                 }
7014                 asoc->peers_rwnd = sctp_sbspace_sub(asoc->peers_rwnd,
7015                     (uint32_t)(data_list[i]->send_size + SCTP_BASE_SYSCTL(sctp_peer_chunk_oh)));
7016                 if (asoc->peers_rwnd < stcb->sctp_ep->sctp_ep.sctp_sws_sender) {
7017                         /* SWS sender side engages */
7018                         asoc->peers_rwnd = 0;
7019                 }
7020         }
7021         if (asoc->cc_functions.sctp_cwnd_update_packet_transmitted) {
7022                 (*asoc->cc_functions.sctp_cwnd_update_packet_transmitted) (stcb, net);
7023         }
7024 }
7025
7026 static void
7027 sctp_clean_up_ctl(struct sctp_tcb *stcb, struct sctp_association *asoc, int so_locked)
7028 {
7029         struct sctp_tmit_chunk *chk, *nchk;
7030
7031         TAILQ_FOREACH_SAFE(chk, &asoc->control_send_queue, sctp_next, nchk) {
7032                 if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
7033                     (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK) ||  /* EY */
7034                     (chk->rec.chunk_id.id == SCTP_HEARTBEAT_REQUEST) ||
7035                     (chk->rec.chunk_id.id == SCTP_HEARTBEAT_ACK) ||
7036                     (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN) ||
7037                     (chk->rec.chunk_id.id == SCTP_SHUTDOWN) ||
7038                     (chk->rec.chunk_id.id == SCTP_SHUTDOWN_ACK) ||
7039                     (chk->rec.chunk_id.id == SCTP_OPERATION_ERROR) ||
7040                     (chk->rec.chunk_id.id == SCTP_PACKET_DROPPED) ||
7041                     (chk->rec.chunk_id.id == SCTP_COOKIE_ACK) ||
7042                     (chk->rec.chunk_id.id == SCTP_ECN_CWR) ||
7043                     (chk->rec.chunk_id.id == SCTP_ASCONF_ACK)) {
7044                         /* Stray chunks must be cleaned up */
7045         clean_up_anyway:
7046                         TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
7047                         asoc->ctrl_queue_cnt--;
7048                         if (chk->data) {
7049                                 sctp_m_freem(chk->data);
7050                                 chk->data = NULL;
7051                         }
7052                         if (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN) {
7053                                 asoc->fwd_tsn_cnt--;
7054                         }
7055                         sctp_free_a_chunk(stcb, chk, so_locked);
7056                 } else if (chk->rec.chunk_id.id == SCTP_STREAM_RESET) {
7057                         /* special handling, we must look into the param */
7058                         if (chk != asoc->str_reset) {
7059                                 goto clean_up_anyway;
7060                         }
7061                 }
7062         }
7063 }
7064
7065 static uint32_t
7066 sctp_can_we_split_this(struct sctp_tcb *stcb, uint32_t length,
7067     uint32_t space_left, uint32_t frag_point, int eeor_on)
7068 {
7069         /*
7070          * Make a decision on if I should split a msg into multiple parts.
7071          * This is only asked of incomplete messages.
7072          */
7073         if (eeor_on) {
7074                 /*
7075                  * If we are doing EEOR we need to always send it if its the
7076                  * entire thing, since it might be all the guy is putting in
7077                  * the hopper.
7078                  */
7079                 if (space_left >= length) {
7080                         /*-
7081                          * If we have data outstanding,
7082                          * we get another chance when the sack
7083                          * arrives to transmit - wait for more data
7084                          */
7085                         if (stcb->asoc.total_flight == 0) {
7086                                 /*
7087                                  * If nothing is in flight, we zero the
7088                                  * packet counter.
7089                                  */
7090                                 return (length);
7091                         }
7092                         return (0);
7093
7094                 } else {
7095                         /* You can fill the rest */
7096                         return (space_left);
7097                 }
7098         }
7099         /*-
7100          * For those strange folk that make the send buffer
7101          * smaller than our fragmentation point, we can't
7102          * get a full msg in so we have to allow splitting.
7103          */
7104         if (SCTP_SB_LIMIT_SND(stcb->sctp_socket) < frag_point) {
7105                 return (length);
7106         }
7107         if ((length <= space_left) ||
7108             ((length - space_left) < SCTP_BASE_SYSCTL(sctp_min_residual))) {
7109                 /* Sub-optimial residual don't split in non-eeor mode. */
7110                 return (0);
7111         }
7112         /*
7113          * If we reach here length is larger than the space_left. Do we wish
7114          * to split it for the sake of packet putting together?
7115          */
7116         if (space_left >= min(SCTP_BASE_SYSCTL(sctp_min_split_point), frag_point)) {
7117                 /* Its ok to split it */
7118                 return (min(space_left, frag_point));
7119         }
7120         /* Nope, can't split */
7121         return (0);
7122 }
7123
7124 static uint32_t
7125 sctp_move_to_outqueue(struct sctp_tcb *stcb,
7126     struct sctp_stream_out *strq,
7127     uint32_t space_left,
7128     uint32_t frag_point,
7129     int *giveup,
7130     int eeor_mode,
7131     int *bail,
7132     int so_locked)
7133 {
7134         /* Move from the stream to the send_queue keeping track of the total */
7135         struct sctp_association *asoc;
7136         struct sctp_stream_queue_pending *sp;
7137         struct sctp_tmit_chunk *chk;
7138         struct sctp_data_chunk *dchkh = NULL;
7139         struct sctp_idata_chunk *ndchkh = NULL;
7140         uint32_t to_move, length;
7141         int leading;
7142         uint8_t rcv_flags = 0;
7143         uint8_t some_taken;
7144         uint8_t send_lock_up = 0;
7145
7146         SCTP_TCB_LOCK_ASSERT(stcb);
7147         asoc = &stcb->asoc;
7148 one_more_time:
7149         /* sa_ignore FREED_MEMORY */
7150         sp = TAILQ_FIRST(&strq->outqueue);
7151         if (sp == NULL) {
7152                 if (send_lock_up == 0) {
7153                         SCTP_TCB_SEND_LOCK(stcb);
7154                         send_lock_up = 1;
7155                 }
7156                 sp = TAILQ_FIRST(&strq->outqueue);
7157                 if (sp) {
7158                         goto one_more_time;
7159                 }
7160                 if ((sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_EXPLICIT_EOR) == 0) &&
7161                     (stcb->asoc.idata_supported == 0) &&
7162                     (strq->last_msg_incomplete)) {
7163                         SCTP_PRINTF("Huh? Stream:%d lm_in_c=%d but queue is NULL\n",
7164                             strq->sid,
7165                             strq->last_msg_incomplete);
7166                         strq->last_msg_incomplete = 0;
7167                 }
7168                 to_move = 0;
7169                 if (send_lock_up) {
7170                         SCTP_TCB_SEND_UNLOCK(stcb);
7171                         send_lock_up = 0;
7172                 }
7173                 goto out_of;
7174         }
7175         if ((sp->msg_is_complete) && (sp->length == 0)) {
7176                 if (sp->sender_all_done) {
7177                         /*
7178                          * We are doing deferred cleanup. Last time through
7179                          * when we took all the data the sender_all_done was
7180                          * not set.
7181                          */
7182                         if ((sp->put_last_out == 0) && (sp->discard_rest == 0)) {
7183                                 SCTP_PRINTF("Gak, put out entire msg with NO end!-1\n");
7184                                 SCTP_PRINTF("sender_done:%d len:%d msg_comp:%d put_last_out:%d send_lock:%d\n",
7185                                     sp->sender_all_done,
7186                                     sp->length,
7187                                     sp->msg_is_complete,
7188                                     sp->put_last_out,
7189                                     send_lock_up);
7190                         }
7191                         if ((TAILQ_NEXT(sp, next) == NULL) && (send_lock_up == 0)) {
7192                                 SCTP_TCB_SEND_LOCK(stcb);
7193                                 send_lock_up = 1;
7194                         }
7195                         atomic_subtract_int(&asoc->stream_queue_cnt, 1);
7196                         TAILQ_REMOVE(&strq->outqueue, sp, next);
7197                         stcb->asoc.ss_functions.sctp_ss_remove_from_stream(stcb, asoc, strq, sp, send_lock_up);
7198                         if ((strq->state == SCTP_STREAM_RESET_PENDING) &&
7199                             (strq->chunks_on_queues == 0) &&
7200                             TAILQ_EMPTY(&strq->outqueue)) {
7201                                 stcb->asoc.trigger_reset = 1;
7202                         }
7203                         if (sp->net) {
7204                                 sctp_free_remote_addr(sp->net);
7205                                 sp->net = NULL;
7206                         }
7207                         if (sp->data) {
7208                                 sctp_m_freem(sp->data);
7209                                 sp->data = NULL;
7210                         }
7211                         sctp_free_a_strmoq(stcb, sp, so_locked);
7212                         /* we can't be locked to it */
7213                         if (send_lock_up) {
7214                                 SCTP_TCB_SEND_UNLOCK(stcb);
7215                                 send_lock_up = 0;
7216                         }
7217                         /* back to get the next msg */
7218                         goto one_more_time;
7219                 } else {
7220                         /*
7221                          * sender just finished this but still holds a
7222                          * reference
7223                          */
7224                         *giveup = 1;
7225                         to_move = 0;
7226                         goto out_of;
7227                 }
7228         } else {
7229                 /* is there some to get */
7230                 if (sp->length == 0) {
7231                         /* no */
7232                         *giveup = 1;
7233                         to_move = 0;
7234                         goto out_of;
7235                 } else if (sp->discard_rest) {
7236                         if (send_lock_up == 0) {
7237                                 SCTP_TCB_SEND_LOCK(stcb);
7238                                 send_lock_up = 1;
7239                         }
7240                         /* Whack down the size */
7241                         atomic_subtract_int(&stcb->asoc.total_output_queue_size, sp->length);
7242                         if ((stcb->sctp_socket != NULL) &&
7243                             ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
7244                             (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL))) {
7245                                 atomic_subtract_int(&stcb->sctp_socket->so_snd.sb_cc, sp->length);
7246                         }
7247                         if (sp->data) {
7248                                 sctp_m_freem(sp->data);
7249                                 sp->data = NULL;
7250                                 sp->tail_mbuf = NULL;
7251                         }
7252                         sp->length = 0;
7253                         sp->some_taken = 1;
7254                         *giveup = 1;
7255                         to_move = 0;
7256                         goto out_of;
7257                 }
7258         }
7259         some_taken = sp->some_taken;
7260 re_look:
7261         length = sp->length;
7262         if (sp->msg_is_complete) {
7263                 /* The message is complete */
7264                 to_move = min(length, frag_point);
7265                 if (to_move == length) {
7266                         /* All of it fits in the MTU */
7267                         if (sp->some_taken) {
7268                                 rcv_flags |= SCTP_DATA_LAST_FRAG;
7269                         } else {
7270                                 rcv_flags |= SCTP_DATA_NOT_FRAG;
7271                         }
7272                         sp->put_last_out = 1;
7273                         if (sp->sinfo_flags & SCTP_SACK_IMMEDIATELY) {
7274                                 rcv_flags |= SCTP_DATA_SACK_IMMEDIATELY;
7275                         }
7276                 } else {
7277                         /* Not all of it fits, we fragment */
7278                         if (sp->some_taken == 0) {
7279                                 rcv_flags |= SCTP_DATA_FIRST_FRAG;
7280                         }
7281                         sp->some_taken = 1;
7282                 }
7283         } else {
7284                 to_move = sctp_can_we_split_this(stcb, length, space_left, frag_point, eeor_mode);
7285                 if (to_move) {
7286                         /*-
7287                          * We use a snapshot of length in case it
7288                          * is expanding during the compare.
7289                          */
7290                         uint32_t llen;
7291
7292                         llen = length;
7293                         if (to_move >= llen) {
7294                                 to_move = llen;
7295                                 if (send_lock_up == 0) {
7296                                         /*-
7297                                          * We are taking all of an incomplete msg
7298                                          * thus we need a send lock.
7299                                          */
7300                                         SCTP_TCB_SEND_LOCK(stcb);
7301                                         send_lock_up = 1;
7302                                         if (sp->msg_is_complete) {
7303                                                 /*
7304                                                  * the sender finished the
7305                                                  * msg
7306                                                  */
7307                                                 goto re_look;
7308                                         }
7309                                 }
7310                         }
7311                         if (sp->some_taken == 0) {
7312                                 rcv_flags |= SCTP_DATA_FIRST_FRAG;
7313                                 sp->some_taken = 1;
7314                         }
7315                 } else {
7316                         /* Nothing to take. */
7317                         *giveup = 1;
7318                         to_move = 0;
7319                         goto out_of;
7320                 }
7321         }
7322
7323         /* If we reach here, we can copy out a chunk */
7324         sctp_alloc_a_chunk(stcb, chk);
7325         if (chk == NULL) {
7326                 /* No chunk memory */
7327                 *giveup = 1;
7328                 to_move = 0;
7329                 goto out_of;
7330         }
7331         /*
7332          * Setup for unordered if needed by looking at the user sent info
7333          * flags.
7334          */
7335         if (sp->sinfo_flags & SCTP_UNORDERED) {
7336                 rcv_flags |= SCTP_DATA_UNORDERED;
7337         }
7338         if (SCTP_BASE_SYSCTL(sctp_enable_sack_immediately) &&
7339             (sp->sinfo_flags & SCTP_EOF) == SCTP_EOF) {
7340                 rcv_flags |= SCTP_DATA_SACK_IMMEDIATELY;
7341         }
7342         /* clear out the chunk before setting up */
7343         memset(chk, 0, sizeof(*chk));
7344         chk->rec.data.rcv_flags = rcv_flags;
7345
7346         if (to_move >= length) {
7347                 /* we think we can steal the whole thing */
7348                 if ((sp->sender_all_done == 0) && (send_lock_up == 0)) {
7349                         SCTP_TCB_SEND_LOCK(stcb);
7350                         send_lock_up = 1;
7351                 }
7352                 if (to_move < sp->length) {
7353                         /* bail, it changed */
7354                         goto dont_do_it;
7355                 }
7356                 chk->data = sp->data;
7357                 chk->last_mbuf = sp->tail_mbuf;
7358                 /* register the stealing */
7359                 sp->data = sp->tail_mbuf = NULL;
7360         } else {
7361                 struct mbuf *m;
7362
7363 dont_do_it:
7364                 chk->data = SCTP_M_COPYM(sp->data, 0, to_move, M_NOWAIT);
7365                 chk->last_mbuf = NULL;
7366                 if (chk->data == NULL) {
7367                         sp->some_taken = some_taken;
7368                         sctp_free_a_chunk(stcb, chk, so_locked);
7369                         *bail = 1;
7370                         to_move = 0;
7371                         goto out_of;
7372                 }
7373 #ifdef SCTP_MBUF_LOGGING
7374                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
7375                         sctp_log_mbc(chk->data, SCTP_MBUF_ICOPY);
7376                 }
7377 #endif
7378                 /* Pull off the data */
7379                 m_adj(sp->data, to_move);
7380                 /* Now lets work our way down and compact it */
7381                 m = sp->data;
7382                 while (m && (SCTP_BUF_LEN(m) == 0)) {
7383                         sp->data = SCTP_BUF_NEXT(m);
7384                         SCTP_BUF_NEXT(m) = NULL;
7385                         if (sp->tail_mbuf == m) {
7386                                 /*-
7387                                  * Freeing tail? TSNH since
7388                                  * we supposedly were taking less
7389                                  * than the sp->length.
7390                                  */
7391 #ifdef INVARIANTS
7392                                 panic("Huh, freing tail? - TSNH");
7393 #else
7394                                 SCTP_PRINTF("Huh, freeing tail? - TSNH\n");
7395                                 sp->tail_mbuf = sp->data = NULL;
7396                                 sp->length = 0;
7397 #endif
7398                         }
7399                         sctp_m_free(m);
7400                         m = sp->data;
7401                 }
7402         }
7403         if (SCTP_BUF_IS_EXTENDED(chk->data)) {
7404                 chk->copy_by_ref = 1;
7405         } else {
7406                 chk->copy_by_ref = 0;
7407         }
7408         /*
7409          * get last_mbuf and counts of mb usage This is ugly but hopefully
7410          * its only one mbuf.
7411          */
7412         if (chk->last_mbuf == NULL) {
7413                 chk->last_mbuf = chk->data;
7414                 while (SCTP_BUF_NEXT(chk->last_mbuf) != NULL) {
7415                         chk->last_mbuf = SCTP_BUF_NEXT(chk->last_mbuf);
7416                 }
7417         }
7418
7419         if (to_move > length) {
7420                 /*- This should not happen either
7421                  * since we always lower to_move to the size
7422                  * of sp->length if its larger.
7423                  */
7424 #ifdef INVARIANTS
7425                 panic("Huh, how can to_move be larger?");
7426 #else
7427                 SCTP_PRINTF("Huh, how can to_move be larger?\n");
7428                 sp->length = 0;
7429 #endif
7430         } else {
7431                 atomic_subtract_int(&sp->length, to_move);
7432         }
7433         leading = SCTP_DATA_CHUNK_OVERHEAD(stcb);
7434         if (M_LEADINGSPACE(chk->data) < leading) {
7435                 /* Not enough room for a chunk header, get some */
7436                 struct mbuf *m;
7437
7438                 m = sctp_get_mbuf_for_msg(1, 0, M_NOWAIT, 1, MT_DATA);
7439                 if (m == NULL) {
7440                         /*
7441                          * we're in trouble here. _PREPEND below will free
7442                          * all the data if there is no leading space, so we
7443                          * must put the data back and restore.
7444                          */
7445                         if (send_lock_up == 0) {
7446                                 SCTP_TCB_SEND_LOCK(stcb);
7447                                 send_lock_up = 1;
7448                         }
7449                         if (sp->data == NULL) {
7450                                 /* unsteal the data */
7451                                 sp->data = chk->data;
7452                                 sp->tail_mbuf = chk->last_mbuf;
7453                         } else {
7454                                 struct mbuf *m_tmp;
7455
7456                                 /* reassemble the data */
7457                                 m_tmp = sp->data;
7458                                 sp->data = chk->data;
7459                                 SCTP_BUF_NEXT(chk->last_mbuf) = m_tmp;
7460                         }
7461                         sp->some_taken = some_taken;
7462                         atomic_add_int(&sp->length, to_move);
7463                         chk->data = NULL;
7464                         *bail = 1;
7465                         sctp_free_a_chunk(stcb, chk, so_locked);
7466                         to_move = 0;
7467                         goto out_of;
7468                 } else {
7469                         SCTP_BUF_LEN(m) = 0;
7470                         SCTP_BUF_NEXT(m) = chk->data;
7471                         chk->data = m;
7472                         M_ALIGN(chk->data, 4);
7473                 }
7474         }
7475         SCTP_BUF_PREPEND(chk->data, SCTP_DATA_CHUNK_OVERHEAD(stcb), M_NOWAIT);
7476         if (chk->data == NULL) {
7477                 /* HELP, TSNH since we assured it would not above? */
7478 #ifdef INVARIANTS
7479                 panic("prepend failes HELP?");
7480 #else
7481                 SCTP_PRINTF("prepend fails HELP?\n");
7482                 sctp_free_a_chunk(stcb, chk, so_locked);
7483 #endif
7484                 *bail = 1;
7485                 to_move = 0;
7486                 goto out_of;
7487         }
7488         sctp_snd_sb_alloc(stcb, SCTP_DATA_CHUNK_OVERHEAD(stcb));
7489         chk->book_size = chk->send_size = (uint16_t)(to_move + SCTP_DATA_CHUNK_OVERHEAD(stcb));
7490         chk->book_size_scale = 0;
7491         chk->sent = SCTP_DATAGRAM_UNSENT;
7492
7493         chk->flags = 0;
7494         chk->asoc = &stcb->asoc;
7495         chk->pad_inplace = 0;
7496         chk->no_fr_allowed = 0;
7497         if (stcb->asoc.idata_supported == 0) {
7498                 if (rcv_flags & SCTP_DATA_UNORDERED) {
7499                         /* Just use 0. The receiver ignores the values. */
7500                         chk->rec.data.mid = 0;
7501                 } else {
7502                         chk->rec.data.mid = strq->next_mid_ordered;
7503                         if (rcv_flags & SCTP_DATA_LAST_FRAG) {
7504                                 strq->next_mid_ordered++;
7505                         }
7506                 }
7507         } else {
7508                 if (rcv_flags & SCTP_DATA_UNORDERED) {
7509                         chk->rec.data.mid = strq->next_mid_unordered;
7510                         if (rcv_flags & SCTP_DATA_LAST_FRAG) {
7511                                 strq->next_mid_unordered++;
7512                         }
7513                 } else {
7514                         chk->rec.data.mid = strq->next_mid_ordered;
7515                         if (rcv_flags & SCTP_DATA_LAST_FRAG) {
7516                                 strq->next_mid_ordered++;
7517                         }
7518                 }
7519         }
7520         chk->rec.data.sid = sp->sid;
7521         chk->rec.data.ppid = sp->ppid;
7522         chk->rec.data.context = sp->context;
7523         chk->rec.data.doing_fast_retransmit = 0;
7524
7525         chk->rec.data.timetodrop = sp->ts;
7526         chk->flags = sp->act_flags;
7527
7528         if (sp->net) {
7529                 chk->whoTo = sp->net;
7530                 atomic_add_int(&chk->whoTo->ref_count, 1);
7531         } else
7532                 chk->whoTo = NULL;
7533
7534         if (sp->holds_key_ref) {
7535                 chk->auth_keyid = sp->auth_keyid;
7536                 sctp_auth_key_acquire(stcb, chk->auth_keyid);
7537                 chk->holds_key_ref = 1;
7538         }
7539         chk->rec.data.tsn = atomic_fetchadd_int(&asoc->sending_seq, 1);
7540         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_AT_SEND_2_OUTQ) {
7541                 sctp_misc_ints(SCTP_STRMOUT_LOG_SEND,
7542                     (uint32_t)(uintptr_t)stcb, sp->length,
7543                     (uint32_t)((chk->rec.data.sid << 16) | (0x0000ffff & chk->rec.data.mid)),
7544                     chk->rec.data.tsn);
7545         }
7546         if (stcb->asoc.idata_supported == 0) {
7547                 dchkh = mtod(chk->data, struct sctp_data_chunk *);
7548         } else {
7549                 ndchkh = mtod(chk->data, struct sctp_idata_chunk *);
7550         }
7551         /*
7552          * Put the rest of the things in place now. Size was done earlier in
7553          * previous loop prior to padding.
7554          */
7555
7556 #ifdef SCTP_ASOCLOG_OF_TSNS
7557         SCTP_TCB_LOCK_ASSERT(stcb);
7558         if (asoc->tsn_out_at >= SCTP_TSN_LOG_SIZE) {
7559                 asoc->tsn_out_at = 0;
7560                 asoc->tsn_out_wrapped = 1;
7561         }
7562         asoc->out_tsnlog[asoc->tsn_out_at].tsn = chk->rec.data.tsn;
7563         asoc->out_tsnlog[asoc->tsn_out_at].strm = chk->rec.data.sid;
7564         asoc->out_tsnlog[asoc->tsn_out_at].seq = chk->rec.data.mid;
7565         asoc->out_tsnlog[asoc->tsn_out_at].sz = chk->send_size;
7566         asoc->out_tsnlog[asoc->tsn_out_at].flgs = chk->rec.data.rcv_flags;
7567         asoc->out_tsnlog[asoc->tsn_out_at].stcb = (void *)stcb;
7568         asoc->out_tsnlog[asoc->tsn_out_at].in_pos = asoc->tsn_out_at;
7569         asoc->out_tsnlog[asoc->tsn_out_at].in_out = 2;
7570         asoc->tsn_out_at++;
7571 #endif
7572         if (stcb->asoc.idata_supported == 0) {
7573                 dchkh->ch.chunk_type = SCTP_DATA;
7574                 dchkh->ch.chunk_flags = chk->rec.data.rcv_flags;
7575                 dchkh->dp.tsn = htonl(chk->rec.data.tsn);
7576                 dchkh->dp.sid = htons(strq->sid);
7577                 dchkh->dp.ssn = htons((uint16_t)chk->rec.data.mid);
7578                 dchkh->dp.ppid = chk->rec.data.ppid;
7579                 dchkh->ch.chunk_length = htons(chk->send_size);
7580         } else {
7581                 ndchkh->ch.chunk_type = SCTP_IDATA;
7582                 ndchkh->ch.chunk_flags = chk->rec.data.rcv_flags;
7583                 ndchkh->dp.tsn = htonl(chk->rec.data.tsn);
7584                 ndchkh->dp.sid = htons(strq->sid);
7585                 ndchkh->dp.reserved = htons(0);
7586                 ndchkh->dp.mid = htonl(chk->rec.data.mid);
7587                 if (sp->fsn == 0)
7588                         ndchkh->dp.ppid_fsn.ppid = chk->rec.data.ppid;
7589                 else
7590                         ndchkh->dp.ppid_fsn.fsn = htonl(sp->fsn);
7591                 sp->fsn++;
7592                 ndchkh->ch.chunk_length = htons(chk->send_size);
7593         }
7594         /* Now advance the chk->send_size by the actual pad needed. */
7595         if (chk->send_size < SCTP_SIZE32(chk->book_size)) {
7596                 /* need a pad */
7597                 struct mbuf *lm;
7598                 int pads;
7599
7600                 pads = SCTP_SIZE32(chk->book_size) - chk->send_size;
7601                 lm = sctp_pad_lastmbuf(chk->data, pads, chk->last_mbuf);
7602                 if (lm != NULL) {
7603                         chk->last_mbuf = lm;
7604                         chk->pad_inplace = 1;
7605                 }
7606                 chk->send_size += pads;
7607         }
7608         if (PR_SCTP_ENABLED(chk->flags)) {
7609                 asoc->pr_sctp_cnt++;
7610         }
7611         if (sp->msg_is_complete && (sp->length == 0) && (sp->sender_all_done)) {
7612                 /* All done pull and kill the message */
7613                 if (sp->put_last_out == 0) {
7614                         SCTP_PRINTF("Gak, put out entire msg with NO end!-2\n");
7615                         SCTP_PRINTF("sender_done:%d len:%d msg_comp:%d put_last_out:%d send_lock:%d\n",
7616                             sp->sender_all_done,
7617                             sp->length,
7618                             sp->msg_is_complete,
7619                             sp->put_last_out,
7620                             send_lock_up);
7621                 }
7622                 if ((send_lock_up == 0) && (TAILQ_NEXT(sp, next) == NULL)) {
7623                         SCTP_TCB_SEND_LOCK(stcb);
7624                         send_lock_up = 1;
7625                 }
7626                 atomic_subtract_int(&asoc->stream_queue_cnt, 1);
7627                 TAILQ_REMOVE(&strq->outqueue, sp, next);
7628                 stcb->asoc.ss_functions.sctp_ss_remove_from_stream(stcb, asoc, strq, sp, send_lock_up);
7629                 if ((strq->state == SCTP_STREAM_RESET_PENDING) &&
7630                     (strq->chunks_on_queues == 0) &&
7631                     TAILQ_EMPTY(&strq->outqueue)) {
7632                         stcb->asoc.trigger_reset = 1;
7633                 }
7634                 if (sp->net) {
7635                         sctp_free_remote_addr(sp->net);
7636                         sp->net = NULL;
7637                 }
7638                 if (sp->data) {
7639                         sctp_m_freem(sp->data);
7640                         sp->data = NULL;
7641                 }
7642                 sctp_free_a_strmoq(stcb, sp, so_locked);
7643         }
7644         asoc->chunks_on_out_queue++;
7645         strq->chunks_on_queues++;
7646         TAILQ_INSERT_TAIL(&asoc->send_queue, chk, sctp_next);
7647         asoc->send_queue_cnt++;
7648 out_of:
7649         if (send_lock_up) {
7650                 SCTP_TCB_SEND_UNLOCK(stcb);
7651         }
7652         return (to_move);
7653 }
7654
7655 static void
7656 sctp_fill_outqueue(struct sctp_tcb *stcb,
7657     struct sctp_nets *net, int frag_point, int eeor_mode, int *quit_now, int so_locked)
7658 {
7659         struct sctp_association *asoc;
7660         struct sctp_stream_out *strq;
7661         uint32_t space_left, moved, total_moved;
7662         int bail, giveup;
7663
7664         SCTP_TCB_LOCK_ASSERT(stcb);
7665         asoc = &stcb->asoc;
7666         total_moved = 0;
7667         switch (net->ro._l_addr.sa.sa_family) {
7668 #ifdef INET
7669         case AF_INET:
7670                 space_left = net->mtu - SCTP_MIN_V4_OVERHEAD;
7671                 break;
7672 #endif
7673 #ifdef INET6
7674         case AF_INET6:
7675                 space_left = net->mtu - SCTP_MIN_OVERHEAD;
7676                 break;
7677 #endif
7678         default:
7679                 /* TSNH */
7680                 space_left = net->mtu;
7681                 break;
7682         }
7683         /* Need an allowance for the data chunk header too */
7684         space_left -= SCTP_DATA_CHUNK_OVERHEAD(stcb);
7685
7686         /* must make even word boundary */
7687         space_left &= 0xfffffffc;
7688         strq = stcb->asoc.ss_functions.sctp_ss_select_stream(stcb, net, asoc);
7689         giveup = 0;
7690         bail = 0;
7691         while ((space_left > 0) && (strq != NULL)) {
7692                 moved = sctp_move_to_outqueue(stcb, strq, space_left, frag_point,
7693                     &giveup, eeor_mode, &bail, so_locked);
7694                 stcb->asoc.ss_functions.sctp_ss_scheduled(stcb, net, asoc, strq, moved);
7695                 if ((giveup != 0) || (bail != 0)) {
7696                         break;
7697                 }
7698                 strq = stcb->asoc.ss_functions.sctp_ss_select_stream(stcb, net, asoc);
7699                 total_moved += moved;
7700                 if (space_left >= moved) {
7701                         space_left -= moved;
7702                 } else {
7703                         space_left = 0;
7704                 }
7705                 if (space_left >= SCTP_DATA_CHUNK_OVERHEAD(stcb)) {
7706                         space_left -= SCTP_DATA_CHUNK_OVERHEAD(stcb);
7707                 } else {
7708                         space_left = 0;
7709                 }
7710                 space_left &= 0xfffffffc;
7711         }
7712         if (bail != 0)
7713                 *quit_now = 1;
7714
7715         stcb->asoc.ss_functions.sctp_ss_packet_done(stcb, net, asoc);
7716
7717         if (total_moved == 0) {
7718                 if ((stcb->asoc.sctp_cmt_on_off == 0) &&
7719                     (net == stcb->asoc.primary_destination)) {
7720                         /* ran dry for primary network net */
7721                         SCTP_STAT_INCR(sctps_primary_randry);
7722                 } else if (stcb->asoc.sctp_cmt_on_off > 0) {
7723                         /* ran dry with CMT on */
7724                         SCTP_STAT_INCR(sctps_cmt_randry);
7725                 }
7726         }
7727 }
7728
7729 void
7730 sctp_fix_ecn_echo(struct sctp_association *asoc)
7731 {
7732         struct sctp_tmit_chunk *chk;
7733
7734         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
7735                 if (chk->rec.chunk_id.id == SCTP_ECN_ECHO) {
7736                         chk->sent = SCTP_DATAGRAM_UNSENT;
7737                 }
7738         }
7739 }
7740
7741 void
7742 sctp_move_chunks_from_net(struct sctp_tcb *stcb, struct sctp_nets *net)
7743 {
7744         struct sctp_association *asoc;
7745         struct sctp_tmit_chunk *chk;
7746         struct sctp_stream_queue_pending *sp;
7747         unsigned int i;
7748
7749         if (net == NULL) {
7750                 return;
7751         }
7752         asoc = &stcb->asoc;
7753         for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
7754                 TAILQ_FOREACH(sp, &stcb->asoc.strmout[i].outqueue, next) {
7755                         if (sp->net == net) {
7756                                 sctp_free_remote_addr(sp->net);
7757                                 sp->net = NULL;
7758                         }
7759                 }
7760         }
7761         TAILQ_FOREACH(chk, &asoc->send_queue, sctp_next) {
7762                 if (chk->whoTo == net) {
7763                         sctp_free_remote_addr(chk->whoTo);
7764                         chk->whoTo = NULL;
7765                 }
7766         }
7767 }
7768
7769 int
7770 sctp_med_chunk_output(struct sctp_inpcb *inp,
7771     struct sctp_tcb *stcb,
7772     struct sctp_association *asoc,
7773     int *num_out,
7774     int *reason_code,
7775     int control_only, int from_where,
7776     struct timeval *now, int *now_filled, int frag_point, int so_locked)
7777 {
7778         /**
7779          * Ok this is the generic chunk service queue. we must do the
7780          * following:
7781          * - Service the stream queue that is next, moving any
7782          *   message (note I must get a complete message i.e. FIRST/MIDDLE and
7783          *   LAST to the out queue in one pass) and assigning TSN's. This
7784          *   only applys though if the peer does not support NDATA. For NDATA
7785          *   chunks its ok to not send the entire message ;-)
7786          * - Check to see if the cwnd/rwnd allows any output, if so we go ahead and
7787          *   fomulate and send the low level chunks. Making sure to combine
7788          *   any control in the control chunk queue also.
7789          */
7790         struct sctp_nets *net, *start_at, *sack_goes_to = NULL, *old_start_at = NULL;
7791         struct mbuf *outchain, *endoutchain;
7792         struct sctp_tmit_chunk *chk, *nchk;
7793
7794         /* temp arrays for unlinking */
7795         struct sctp_tmit_chunk *data_list[SCTP_MAX_DATA_BUNDLING];
7796         int no_fragmentflg, error;
7797         unsigned int max_rwnd_per_dest, max_send_per_dest;
7798         int one_chunk, hbflag, skip_data_for_this_net;
7799         int asconf, cookie, no_out_cnt;
7800         int bundle_at, ctl_cnt, no_data_chunks, eeor_mode;
7801         unsigned int mtu, r_mtu, omtu, mx_mtu, to_out;
7802         int tsns_sent = 0;
7803         uint32_t auth_offset;
7804         struct sctp_auth_chunk *auth;
7805         uint16_t auth_keyid;
7806         int override_ok = 1;
7807         int skip_fill_up = 0;
7808         int data_auth_reqd = 0;
7809
7810         /*
7811          * JRS 5/14/07 - Add flag for whether a heartbeat is sent to the
7812          * destination.
7813          */
7814         int quit_now = 0;
7815
7816         *num_out = 0;
7817         *reason_code = 0;
7818         auth_keyid = stcb->asoc.authinfo.active_keyid;
7819         if ((asoc->state & SCTP_STATE_SHUTDOWN_PENDING) ||
7820             (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_RECEIVED) ||
7821             (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_EXPLICIT_EOR))) {
7822                 eeor_mode = 1;
7823         } else {
7824                 eeor_mode = 0;
7825         }
7826         ctl_cnt = no_out_cnt = asconf = cookie = 0;
7827         /*
7828          * First lets prime the pump. For each destination, if there is room
7829          * in the flight size, attempt to pull an MTU's worth out of the
7830          * stream queues into the general send_queue
7831          */
7832 #ifdef SCTP_AUDITING_ENABLED
7833         sctp_audit_log(0xC2, 2);
7834 #endif
7835         SCTP_TCB_LOCK_ASSERT(stcb);
7836         hbflag = 0;
7837         if (control_only)
7838                 no_data_chunks = 1;
7839         else
7840                 no_data_chunks = 0;
7841
7842         /* Nothing to possible to send? */
7843         if ((TAILQ_EMPTY(&asoc->control_send_queue) ||
7844             (asoc->ctrl_queue_cnt == stcb->asoc.ecn_echo_cnt_onq)) &&
7845             TAILQ_EMPTY(&asoc->asconf_send_queue) &&
7846             TAILQ_EMPTY(&asoc->send_queue) &&
7847             sctp_is_there_unsent_data(stcb, so_locked) == 0) {
7848 nothing_to_send:
7849                 *reason_code = 9;
7850                 return (0);
7851         }
7852         if (asoc->peers_rwnd == 0) {
7853                 /* No room in peers rwnd */
7854                 *reason_code = 1;
7855                 if (asoc->total_flight > 0) {
7856                         /* we are allowed one chunk in flight */
7857                         no_data_chunks = 1;
7858                 }
7859         }
7860         if (stcb->asoc.ecn_echo_cnt_onq) {
7861                 /* Record where a sack goes, if any */
7862                 if (no_data_chunks &&
7863                     (asoc->ctrl_queue_cnt == stcb->asoc.ecn_echo_cnt_onq)) {
7864                         /* Nothing but ECNe to send - we don't do that */
7865                         goto nothing_to_send;
7866                 }
7867                 TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
7868                         if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
7869                             (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK)) {
7870                                 sack_goes_to = chk->whoTo;
7871                                 break;
7872                         }
7873                 }
7874         }
7875         max_rwnd_per_dest = ((asoc->peers_rwnd + asoc->total_flight) / asoc->numnets);
7876         if (stcb->sctp_socket)
7877                 max_send_per_dest = SCTP_SB_LIMIT_SND(stcb->sctp_socket) / asoc->numnets;
7878         else
7879                 max_send_per_dest = 0;
7880         if (no_data_chunks == 0) {
7881                 /* How many non-directed chunks are there? */
7882                 TAILQ_FOREACH(chk, &asoc->send_queue, sctp_next) {
7883                         if (chk->whoTo == NULL) {
7884                                 /*
7885                                  * We already have non-directed chunks on
7886                                  * the queue, no need to do a fill-up.
7887                                  */
7888                                 skip_fill_up = 1;
7889                                 break;
7890                         }
7891                 }
7892         }
7893         if ((no_data_chunks == 0) &&
7894             (skip_fill_up == 0) &&
7895             (!stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc))) {
7896                 TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
7897                         /*
7898                          * This for loop we are in takes in each net, if
7899                          * its's got space in cwnd and has data sent to it
7900                          * (when CMT is off) then it calls
7901                          * sctp_fill_outqueue for the net. This gets data on
7902                          * the send queue for that network.
7903                          *
7904                          * In sctp_fill_outqueue TSN's are assigned and data
7905                          * is copied out of the stream buffers. Note mostly
7906                          * copy by reference (we hope).
7907                          */
7908                         net->window_probe = 0;
7909                         if ((net != stcb->asoc.alternate) &&
7910                             ((net->dest_state & SCTP_ADDR_PF) ||
7911                             (!(net->dest_state & SCTP_ADDR_REACHABLE)) ||
7912                             (net->dest_state & SCTP_ADDR_UNCONFIRMED))) {
7913                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
7914                                         sctp_log_cwnd(stcb, net, 1,
7915                                             SCTP_CWND_LOG_FILL_OUTQ_CALLED);
7916                                 }
7917                                 continue;
7918                         }
7919                         if ((stcb->asoc.cc_functions.sctp_cwnd_new_transmission_begins) &&
7920                             (net->flight_size == 0)) {
7921                                 (*stcb->asoc.cc_functions.sctp_cwnd_new_transmission_begins) (stcb, net);
7922                         }
7923                         if (net->flight_size >= net->cwnd) {
7924                                 /* skip this network, no room - can't fill */
7925                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
7926                                         sctp_log_cwnd(stcb, net, 3,
7927                                             SCTP_CWND_LOG_FILL_OUTQ_CALLED);
7928                                 }
7929                                 continue;
7930                         }
7931                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
7932                                 sctp_log_cwnd(stcb, net, 4, SCTP_CWND_LOG_FILL_OUTQ_CALLED);
7933                         }
7934                         sctp_fill_outqueue(stcb, net, frag_point, eeor_mode, &quit_now, so_locked);
7935                         if (quit_now) {
7936                                 /* memory alloc failure */
7937                                 no_data_chunks = 1;
7938                                 break;
7939                         }
7940                 }
7941         }
7942         /* now service each destination and send out what we can for it */
7943         /* Nothing to send? */
7944         if (TAILQ_EMPTY(&asoc->control_send_queue) &&
7945             TAILQ_EMPTY(&asoc->asconf_send_queue) &&
7946             TAILQ_EMPTY(&asoc->send_queue)) {
7947                 *reason_code = 8;
7948                 return (0);
7949         }
7950
7951         if (asoc->sctp_cmt_on_off > 0) {
7952                 /* get the last start point */
7953                 start_at = asoc->last_net_cmt_send_started;
7954                 if (start_at == NULL) {
7955                         /* null so to beginning */
7956                         start_at = TAILQ_FIRST(&asoc->nets);
7957                 } else {
7958                         start_at = TAILQ_NEXT(asoc->last_net_cmt_send_started, sctp_next);
7959                         if (start_at == NULL) {
7960                                 start_at = TAILQ_FIRST(&asoc->nets);
7961                         }
7962                 }
7963                 asoc->last_net_cmt_send_started = start_at;
7964         } else {
7965                 start_at = TAILQ_FIRST(&asoc->nets);
7966         }
7967         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
7968                 if (chk->whoTo == NULL) {
7969                         if (asoc->alternate) {
7970                                 chk->whoTo = asoc->alternate;
7971                         } else {
7972                                 chk->whoTo = asoc->primary_destination;
7973                         }
7974                         atomic_add_int(&chk->whoTo->ref_count, 1);
7975                 }
7976         }
7977         old_start_at = NULL;
7978 again_one_more_time:
7979         for (net = start_at; net != NULL; net = TAILQ_NEXT(net, sctp_next)) {
7980                 /* how much can we send? */
7981                 /* SCTPDBG("Examine for sending net:%x\n", (uint32_t)net); */
7982                 if (old_start_at && (old_start_at == net)) {
7983                         /* through list ocmpletely. */
7984                         break;
7985                 }
7986                 tsns_sent = 0xa;
7987                 if (TAILQ_EMPTY(&asoc->control_send_queue) &&
7988                     TAILQ_EMPTY(&asoc->asconf_send_queue) &&
7989                     (net->flight_size >= net->cwnd)) {
7990                         /*
7991                          * Nothing on control or asconf and flight is full,
7992                          * we can skip even in the CMT case.
7993                          */
7994                         continue;
7995                 }
7996                 bundle_at = 0;
7997                 endoutchain = outchain = NULL;
7998                 auth = NULL;
7999                 auth_offset = 0;
8000                 no_fragmentflg = 1;
8001                 one_chunk = 0;
8002                 if (net->dest_state & SCTP_ADDR_UNCONFIRMED) {
8003                         skip_data_for_this_net = 1;
8004                 } else {
8005                         skip_data_for_this_net = 0;
8006                 }
8007                 switch (((struct sockaddr *)&net->ro._l_addr)->sa_family) {
8008 #ifdef INET
8009                 case AF_INET:
8010                         mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
8011                         break;
8012 #endif
8013 #ifdef INET6
8014                 case AF_INET6:
8015                         mtu = net->mtu - SCTP_MIN_OVERHEAD;
8016                         break;
8017 #endif
8018                 default:
8019                         /* TSNH */
8020                         mtu = net->mtu;
8021                         break;
8022                 }
8023                 mx_mtu = mtu;
8024                 to_out = 0;
8025                 if (mtu > asoc->peers_rwnd) {
8026                         if (asoc->total_flight > 0) {
8027                                 /* We have a packet in flight somewhere */
8028                                 r_mtu = asoc->peers_rwnd;
8029                         } else {
8030                                 /* We are always allowed to send one MTU out */
8031                                 one_chunk = 1;
8032                                 r_mtu = mtu;
8033                         }
8034                 } else {
8035                         r_mtu = mtu;
8036                 }
8037                 error = 0;
8038                 /************************/
8039                 /* ASCONF transmission */
8040                 /************************/
8041                 /* Now first lets go through the asconf queue */
8042                 TAILQ_FOREACH_SAFE(chk, &asoc->asconf_send_queue, sctp_next, nchk) {
8043                         if (chk->rec.chunk_id.id != SCTP_ASCONF) {
8044                                 continue;
8045                         }
8046                         if (chk->whoTo == NULL) {
8047                                 if (asoc->alternate == NULL) {
8048                                         if (asoc->primary_destination != net) {
8049                                                 break;
8050                                         }
8051                                 } else {
8052                                         if (asoc->alternate != net) {
8053                                                 break;
8054                                         }
8055                                 }
8056                         } else {
8057                                 if (chk->whoTo != net) {
8058                                         break;
8059                                 }
8060                         }
8061                         if (chk->data == NULL) {
8062                                 break;
8063                         }
8064                         if (chk->sent != SCTP_DATAGRAM_UNSENT &&
8065                             chk->sent != SCTP_DATAGRAM_RESEND) {
8066                                 break;
8067                         }
8068                         /*
8069                          * if no AUTH is yet included and this chunk
8070                          * requires it, make sure to account for it.  We
8071                          * don't apply the size until the AUTH chunk is
8072                          * actually added below in case there is no room for
8073                          * this chunk. NOTE: we overload the use of "omtu"
8074                          * here
8075                          */
8076                         if ((auth == NULL) &&
8077                             sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
8078                             stcb->asoc.peer_auth_chunks)) {
8079                                 omtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
8080                         } else
8081                                 omtu = 0;
8082                         /* Here we do NOT factor the r_mtu */
8083                         if ((chk->send_size < (int)(mtu - omtu)) ||
8084                             (chk->flags & CHUNK_FLAGS_FRAGMENT_OK)) {
8085                                 /*
8086                                  * We probably should glom the mbuf chain
8087                                  * from the chk->data for control but the
8088                                  * problem is it becomes yet one more level
8089                                  * of tracking to do if for some reason
8090                                  * output fails. Then I have got to
8091                                  * reconstruct the merged control chain.. el
8092                                  * yucko.. for now we take the easy way and
8093                                  * do the copy
8094                                  */
8095                                 /*
8096                                  * Add an AUTH chunk, if chunk requires it
8097                                  * save the offset into the chain for AUTH
8098                                  */
8099                                 if ((auth == NULL) &&
8100                                     (sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
8101                                     stcb->asoc.peer_auth_chunks))) {
8102                                         outchain = sctp_add_auth_chunk(outchain,
8103                                             &endoutchain,
8104                                             &auth,
8105                                             &auth_offset,
8106                                             stcb,
8107                                             chk->rec.chunk_id.id);
8108                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8109                                 }
8110                                 outchain = sctp_copy_mbufchain(chk->data, outchain, &endoutchain,
8111                                     (int)chk->rec.chunk_id.can_take_data,
8112                                     chk->send_size, chk->copy_by_ref);
8113                                 if (outchain == NULL) {
8114                                         *reason_code = 8;
8115                                         SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
8116                                         return (ENOMEM);
8117                                 }
8118                                 SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8119                                 /* update our MTU size */
8120                                 if (mtu > (chk->send_size + omtu))
8121                                         mtu -= (chk->send_size + omtu);
8122                                 else
8123                                         mtu = 0;
8124                                 to_out += (chk->send_size + omtu);
8125                                 /* Do clear IP_DF ? */
8126                                 if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
8127                                         no_fragmentflg = 0;
8128                                 }
8129                                 if (chk->rec.chunk_id.can_take_data)
8130                                         chk->data = NULL;
8131                                 /*
8132                                  * set hb flag since we can use these for
8133                                  * RTO
8134                                  */
8135                                 hbflag = 1;
8136                                 asconf = 1;
8137                                 /*
8138                                  * should sysctl this: don't bundle data
8139                                  * with ASCONF since it requires AUTH
8140                                  */
8141                                 no_data_chunks = 1;
8142                                 chk->sent = SCTP_DATAGRAM_SENT;
8143                                 if (chk->whoTo == NULL) {
8144                                         chk->whoTo = net;
8145                                         atomic_add_int(&net->ref_count, 1);
8146                                 }
8147                                 chk->snd_count++;
8148                                 if (mtu == 0) {
8149                                         /*
8150                                          * Ok we are out of room but we can
8151                                          * output without effecting the
8152                                          * flight size since this little guy
8153                                          * is a control only packet.
8154                                          */
8155                                         sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp, stcb, net);
8156                                         /*
8157                                          * do NOT clear the asconf flag as
8158                                          * it is used to do appropriate
8159                                          * source address selection.
8160                                          */
8161                                         if (*now_filled == 0) {
8162                                                 (void)SCTP_GETTIME_TIMEVAL(now);
8163                                                 *now_filled = 1;
8164                                         }
8165                                         net->last_sent_time = *now;
8166                                         hbflag = 0;
8167                                         if ((error = sctp_lowlevel_chunk_output(inp, stcb, net,
8168                                             (struct sockaddr *)&net->ro._l_addr,
8169                                             outchain, auth_offset, auth,
8170                                             stcb->asoc.authinfo.active_keyid,
8171                                             no_fragmentflg, 0, asconf,
8172                                             inp->sctp_lport, stcb->rport,
8173                                             htonl(stcb->asoc.peer_vtag),
8174                                             net->port, NULL,
8175                                             0, 0,
8176                                             so_locked))) {
8177                                                 /*
8178                                                  * error, we could not
8179                                                  * output
8180                                                  */
8181                                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
8182                                                 if (from_where == 0) {
8183                                                         SCTP_STAT_INCR(sctps_lowlevelerrusr);
8184                                                 }
8185                                                 if (error == ENOBUFS) {
8186                                                         asoc->ifp_had_enobuf = 1;
8187                                                         SCTP_STAT_INCR(sctps_lowlevelerr);
8188                                                 }
8189                                                 /* error, could not output */
8190                                                 if (error == EHOSTUNREACH) {
8191                                                         /*
8192                                                          * Destination went
8193                                                          * unreachable
8194                                                          * during this send
8195                                                          */
8196                                                         sctp_move_chunks_from_net(stcb, net);
8197                                                 }
8198                                                 *reason_code = 7;
8199                                                 break;
8200                                         } else {
8201                                                 asoc->ifp_had_enobuf = 0;
8202                                         }
8203                                         /*
8204                                          * increase the number we sent, if a
8205                                          * cookie is sent we don't tell them
8206                                          * any was sent out.
8207                                          */
8208                                         outchain = endoutchain = NULL;
8209                                         auth = NULL;
8210                                         auth_offset = 0;
8211                                         if (!no_out_cnt)
8212                                                 *num_out += ctl_cnt;
8213                                         /* recalc a clean slate and setup */
8214                                         switch (net->ro._l_addr.sa.sa_family) {
8215 #ifdef INET
8216                                         case AF_INET:
8217                                                 mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
8218                                                 break;
8219 #endif
8220 #ifdef INET6
8221                                         case AF_INET6:
8222                                                 mtu = net->mtu - SCTP_MIN_OVERHEAD;
8223                                                 break;
8224 #endif
8225                                         default:
8226                                                 /* TSNH */
8227                                                 mtu = net->mtu;
8228                                                 break;
8229                                         }
8230                                         to_out = 0;
8231                                         no_fragmentflg = 1;
8232                                 }
8233                         }
8234                 }
8235                 if (error != 0) {
8236                         /* try next net */
8237                         continue;
8238                 }
8239                 /************************/
8240                 /* Control transmission */
8241                 /************************/
8242                 /* Now first lets go through the control queue */
8243                 TAILQ_FOREACH_SAFE(chk, &asoc->control_send_queue, sctp_next, nchk) {
8244                         if ((sack_goes_to) &&
8245                             (chk->rec.chunk_id.id == SCTP_ECN_ECHO) &&
8246                             (chk->whoTo != sack_goes_to)) {
8247                                 /*
8248                                  * if we have a sack in queue, and we are
8249                                  * looking at an ecn echo that is NOT queued
8250                                  * to where the sack is going..
8251                                  */
8252                                 if (chk->whoTo == net) {
8253                                         /*
8254                                          * Don't transmit it to where its
8255                                          * going (current net)
8256                                          */
8257                                         continue;
8258                                 } else if (sack_goes_to == net) {
8259                                         /*
8260                                          * But do transmit it to this
8261                                          * address
8262                                          */
8263                                         goto skip_net_check;
8264                                 }
8265                         }
8266                         if (chk->whoTo == NULL) {
8267                                 if (asoc->alternate == NULL) {
8268                                         if (asoc->primary_destination != net) {
8269                                                 continue;
8270                                         }
8271                                 } else {
8272                                         if (asoc->alternate != net) {
8273                                                 continue;
8274                                         }
8275                                 }
8276                         } else {
8277                                 if (chk->whoTo != net) {
8278                                         continue;
8279                                 }
8280                         }
8281         skip_net_check:
8282                         if (chk->data == NULL) {
8283                                 continue;
8284                         }
8285                         if (chk->sent != SCTP_DATAGRAM_UNSENT) {
8286                                 /*
8287                                  * It must be unsent. Cookies and ASCONF's
8288                                  * hang around but there timers will force
8289                                  * when marked for resend.
8290                                  */
8291                                 continue;
8292                         }
8293                         /*
8294                          * if no AUTH is yet included and this chunk
8295                          * requires it, make sure to account for it.  We
8296                          * don't apply the size until the AUTH chunk is
8297                          * actually added below in case there is no room for
8298                          * this chunk. NOTE: we overload the use of "omtu"
8299                          * here
8300                          */
8301                         if ((auth == NULL) &&
8302                             sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
8303                             stcb->asoc.peer_auth_chunks)) {
8304                                 omtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
8305                         } else
8306                                 omtu = 0;
8307                         /* Here we do NOT factor the r_mtu */
8308                         if ((chk->send_size <= (int)(mtu - omtu)) ||
8309                             (chk->flags & CHUNK_FLAGS_FRAGMENT_OK)) {
8310                                 /*
8311                                  * We probably should glom the mbuf chain
8312                                  * from the chk->data for control but the
8313                                  * problem is it becomes yet one more level
8314                                  * of tracking to do if for some reason
8315                                  * output fails. Then I have got to
8316                                  * reconstruct the merged control chain.. el
8317                                  * yucko.. for now we take the easy way and
8318                                  * do the copy
8319                                  */
8320                                 /*
8321                                  * Add an AUTH chunk, if chunk requires it
8322                                  * save the offset into the chain for AUTH
8323                                  */
8324                                 if ((auth == NULL) &&
8325                                     (sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
8326                                     stcb->asoc.peer_auth_chunks))) {
8327                                         outchain = sctp_add_auth_chunk(outchain,
8328                                             &endoutchain,
8329                                             &auth,
8330                                             &auth_offset,
8331                                             stcb,
8332                                             chk->rec.chunk_id.id);
8333                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8334                                 }
8335                                 outchain = sctp_copy_mbufchain(chk->data, outchain, &endoutchain,
8336                                     (int)chk->rec.chunk_id.can_take_data,
8337                                     chk->send_size, chk->copy_by_ref);
8338                                 if (outchain == NULL) {
8339                                         *reason_code = 8;
8340                                         SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
8341                                         return (ENOMEM);
8342                                 }
8343                                 SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8344                                 /* update our MTU size */
8345                                 if (mtu > (chk->send_size + omtu))
8346                                         mtu -= (chk->send_size + omtu);
8347                                 else
8348                                         mtu = 0;
8349                                 to_out += (chk->send_size + omtu);
8350                                 /* Do clear IP_DF ? */
8351                                 if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
8352                                         no_fragmentflg = 0;
8353                                 }
8354                                 if (chk->rec.chunk_id.can_take_data)
8355                                         chk->data = NULL;
8356                                 /* Mark things to be removed, if needed */
8357                                 if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
8358                                     (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK) ||  /* EY */
8359                                     (chk->rec.chunk_id.id == SCTP_HEARTBEAT_REQUEST) ||
8360                                     (chk->rec.chunk_id.id == SCTP_HEARTBEAT_ACK) ||
8361                                     (chk->rec.chunk_id.id == SCTP_SHUTDOWN) ||
8362                                     (chk->rec.chunk_id.id == SCTP_SHUTDOWN_ACK) ||
8363                                     (chk->rec.chunk_id.id == SCTP_OPERATION_ERROR) ||
8364                                     (chk->rec.chunk_id.id == SCTP_COOKIE_ACK) ||
8365                                     (chk->rec.chunk_id.id == SCTP_ECN_CWR) ||
8366                                     (chk->rec.chunk_id.id == SCTP_PACKET_DROPPED) ||
8367                                     (chk->rec.chunk_id.id == SCTP_ASCONF_ACK)) {
8368                                         if (chk->rec.chunk_id.id == SCTP_HEARTBEAT_REQUEST) {
8369                                                 hbflag = 1;
8370                                         }
8371                                         /* remove these chunks at the end */
8372                                         if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
8373                                             (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK)) {
8374                                                 /* turn off the timer */
8375                                                 if (SCTP_OS_TIMER_PENDING(&stcb->asoc.dack_timer.timer)) {
8376                                                         sctp_timer_stop(SCTP_TIMER_TYPE_RECV,
8377                                                             inp, stcb, NULL,
8378                                                             SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_1);
8379                                                 }
8380                                         }
8381                                         ctl_cnt++;
8382                                 } else {
8383                                         /*
8384                                          * Other chunks, since they have
8385                                          * timers running (i.e. COOKIE) we
8386                                          * just "trust" that it gets sent or
8387                                          * retransmitted.
8388                                          */
8389                                         ctl_cnt++;
8390                                         if (chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
8391                                                 cookie = 1;
8392                                                 no_out_cnt = 1;
8393                                         } else if (chk->rec.chunk_id.id == SCTP_ECN_ECHO) {
8394                                                 /*
8395                                                  * Increment ecne send count
8396                                                  * here this means we may be
8397                                                  * over-zealous in our
8398                                                  * counting if the send
8399                                                  * fails, but its the best
8400                                                  * place to do it (we used
8401                                                  * to do it in the queue of
8402                                                  * the chunk, but that did
8403                                                  * not tell how many times
8404                                                  * it was sent.
8405                                                  */
8406                                                 SCTP_STAT_INCR(sctps_sendecne);
8407                                         }
8408                                         chk->sent = SCTP_DATAGRAM_SENT;
8409                                         if (chk->whoTo == NULL) {
8410                                                 chk->whoTo = net;
8411                                                 atomic_add_int(&net->ref_count, 1);
8412                                         }
8413                                         chk->snd_count++;
8414                                 }
8415                                 if (mtu == 0) {
8416                                         /*
8417                                          * Ok we are out of room but we can
8418                                          * output without effecting the
8419                                          * flight size since this little guy
8420                                          * is a control only packet.
8421                                          */
8422                                         if (asconf) {
8423                                                 sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp, stcb, net);
8424                                                 /*
8425                                                  * do NOT clear the asconf
8426                                                  * flag as it is used to do
8427                                                  * appropriate source
8428                                                  * address selection.
8429                                                  */
8430                                         }
8431                                         if (cookie) {
8432                                                 sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, inp, stcb, net);
8433                                                 cookie = 0;
8434                                         }
8435                                         /* Only HB or ASCONF advances time */
8436                                         if (hbflag) {
8437                                                 if (*now_filled == 0) {
8438                                                         (void)SCTP_GETTIME_TIMEVAL(now);
8439                                                         *now_filled = 1;
8440                                                 }
8441                                                 net->last_sent_time = *now;
8442                                                 hbflag = 0;
8443                                         }
8444                                         if ((error = sctp_lowlevel_chunk_output(inp, stcb, net,
8445                                             (struct sockaddr *)&net->ro._l_addr,
8446                                             outchain,
8447                                             auth_offset, auth,
8448                                             stcb->asoc.authinfo.active_keyid,
8449                                             no_fragmentflg, 0, asconf,
8450                                             inp->sctp_lport, stcb->rport,
8451                                             htonl(stcb->asoc.peer_vtag),
8452                                             net->port, NULL,
8453                                             0, 0,
8454                                             so_locked))) {
8455                                                 /*
8456                                                  * error, we could not
8457                                                  * output
8458                                                  */
8459                                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
8460                                                 if (from_where == 0) {
8461                                                         SCTP_STAT_INCR(sctps_lowlevelerrusr);
8462                                                 }
8463                                                 if (error == ENOBUFS) {
8464                                                         asoc->ifp_had_enobuf = 1;
8465                                                         SCTP_STAT_INCR(sctps_lowlevelerr);
8466                                                 }
8467                                                 if (error == EHOSTUNREACH) {
8468                                                         /*
8469                                                          * Destination went
8470                                                          * unreachable
8471                                                          * during this send
8472                                                          */
8473                                                         sctp_move_chunks_from_net(stcb, net);
8474                                                 }
8475                                                 *reason_code = 7;
8476                                                 break;
8477                                         } else {
8478                                                 asoc->ifp_had_enobuf = 0;
8479                                         }
8480                                         /*
8481                                          * increase the number we sent, if a
8482                                          * cookie is sent we don't tell them
8483                                          * any was sent out.
8484                                          */
8485                                         outchain = endoutchain = NULL;
8486                                         auth = NULL;
8487                                         auth_offset = 0;
8488                                         if (!no_out_cnt)
8489                                                 *num_out += ctl_cnt;
8490                                         /* recalc a clean slate and setup */
8491                                         switch (net->ro._l_addr.sa.sa_family) {
8492 #ifdef INET
8493                                         case AF_INET:
8494                                                 mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
8495                                                 break;
8496 #endif
8497 #ifdef INET6
8498                                         case AF_INET6:
8499                                                 mtu = net->mtu - SCTP_MIN_OVERHEAD;
8500                                                 break;
8501 #endif
8502                                         default:
8503                                                 /* TSNH */
8504                                                 mtu = net->mtu;
8505                                                 break;
8506                                         }
8507                                         to_out = 0;
8508                                         no_fragmentflg = 1;
8509                                 }
8510                         }
8511                 }
8512                 if (error != 0) {
8513                         /* try next net */
8514                         continue;
8515                 }
8516                 /* JRI: if dest is in PF state, do not send data to it */
8517                 if ((asoc->sctp_cmt_on_off > 0) &&
8518                     (net != stcb->asoc.alternate) &&
8519                     (net->dest_state & SCTP_ADDR_PF)) {
8520                         goto no_data_fill;
8521                 }
8522                 if (net->flight_size >= net->cwnd) {
8523                         goto no_data_fill;
8524                 }
8525                 if ((asoc->sctp_cmt_on_off > 0) &&
8526                     (SCTP_BASE_SYSCTL(sctp_buffer_splitting) & SCTP_RECV_BUFFER_SPLITTING) &&
8527                     (net->flight_size > max_rwnd_per_dest)) {
8528                         goto no_data_fill;
8529                 }
8530                 /*
8531                  * We need a specific accounting for the usage of the send
8532                  * buffer. We also need to check the number of messages per
8533                  * net. For now, this is better than nothing and it disabled
8534                  * by default...
8535                  */
8536                 if ((asoc->sctp_cmt_on_off > 0) &&
8537                     (SCTP_BASE_SYSCTL(sctp_buffer_splitting) & SCTP_SEND_BUFFER_SPLITTING) &&
8538                     (max_send_per_dest > 0) &&
8539                     (net->flight_size > max_send_per_dest)) {
8540                         goto no_data_fill;
8541                 }
8542                 /*********************/
8543                 /* Data transmission */
8544                 /*********************/
8545                 /*
8546                  * if AUTH for DATA is required and no AUTH has been added
8547                  * yet, account for this in the mtu now... if no data can be
8548                  * bundled, this adjustment won't matter anyways since the
8549                  * packet will be going out...
8550                  */
8551                 data_auth_reqd = sctp_auth_is_required_chunk(SCTP_DATA,
8552                     stcb->asoc.peer_auth_chunks);
8553                 if (data_auth_reqd && (auth == NULL)) {
8554                         mtu -= sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
8555                 }
8556                 /* now lets add any data within the MTU constraints */
8557                 switch (((struct sockaddr *)&net->ro._l_addr)->sa_family) {
8558 #ifdef INET
8559                 case AF_INET:
8560                         if (net->mtu > SCTP_MIN_V4_OVERHEAD)
8561                                 omtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
8562                         else
8563                                 omtu = 0;
8564                         break;
8565 #endif
8566 #ifdef INET6
8567                 case AF_INET6:
8568                         if (net->mtu > SCTP_MIN_OVERHEAD)
8569                                 omtu = net->mtu - SCTP_MIN_OVERHEAD;
8570                         else
8571                                 omtu = 0;
8572                         break;
8573 #endif
8574                 default:
8575                         /* TSNH */
8576                         omtu = 0;
8577                         break;
8578                 }
8579                 if ((((SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) ||
8580                     (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_RECEIVED)) &&
8581                     (skip_data_for_this_net == 0)) ||
8582                     (cookie)) {
8583                         TAILQ_FOREACH_SAFE(chk, &asoc->send_queue, sctp_next, nchk) {
8584                                 if (no_data_chunks) {
8585                                         /* let only control go out */
8586                                         *reason_code = 1;
8587                                         break;
8588                                 }
8589                                 if (net->flight_size >= net->cwnd) {
8590                                         /* skip this net, no room for data */
8591                                         *reason_code = 2;
8592                                         break;
8593                                 }
8594                                 if ((chk->whoTo != NULL) &&
8595                                     (chk->whoTo != net)) {
8596                                         /* Don't send the chunk on this net */
8597                                         continue;
8598                                 }
8599
8600                                 if (asoc->sctp_cmt_on_off == 0) {
8601                                         if ((asoc->alternate) &&
8602                                             (asoc->alternate != net) &&
8603                                             (chk->whoTo == NULL)) {
8604                                                 continue;
8605                                         } else if ((net != asoc->primary_destination) &&
8606                                                     (asoc->alternate == NULL) &&
8607                                             (chk->whoTo == NULL)) {
8608                                                 continue;
8609                                         }
8610                                 }
8611                                 if ((chk->send_size > omtu) && ((chk->flags & CHUNK_FLAGS_FRAGMENT_OK) == 0)) {
8612                                         /*-
8613                                          * strange, we have a chunk that is
8614                                          * to big for its destination and
8615                                          * yet no fragment ok flag.
8616                                          * Something went wrong when the
8617                                          * PMTU changed...we did not mark
8618                                          * this chunk for some reason?? I
8619                                          * will fix it here by letting IP
8620                                          * fragment it for now and printing
8621                                          * a warning. This really should not
8622                                          * happen ...
8623                                          */
8624                                         SCTP_PRINTF("Warning chunk of %d bytes > mtu:%d and yet PMTU disc missed\n",
8625                                             chk->send_size, mtu);
8626                                         chk->flags |= CHUNK_FLAGS_FRAGMENT_OK;
8627                                 }
8628                                 if (SCTP_BASE_SYSCTL(sctp_enable_sack_immediately) &&
8629                                     (asoc->state & SCTP_STATE_SHUTDOWN_PENDING)) {
8630                                         struct sctp_data_chunk *dchkh;
8631
8632                                         dchkh = mtod(chk->data, struct sctp_data_chunk *);
8633                                         dchkh->ch.chunk_flags |= SCTP_DATA_SACK_IMMEDIATELY;
8634                                 }
8635                                 if (((chk->send_size <= mtu) && (chk->send_size <= r_mtu)) ||
8636                                     ((chk->flags & CHUNK_FLAGS_FRAGMENT_OK) && (chk->send_size <= asoc->peers_rwnd))) {
8637                                         /* ok we will add this one */
8638
8639                                         /*
8640                                          * Add an AUTH chunk, if chunk
8641                                          * requires it, save the offset into
8642                                          * the chain for AUTH
8643                                          */
8644                                         if (data_auth_reqd) {
8645                                                 if (auth == NULL) {
8646                                                         outchain = sctp_add_auth_chunk(outchain,
8647                                                             &endoutchain,
8648                                                             &auth,
8649                                                             &auth_offset,
8650                                                             stcb,
8651                                                             SCTP_DATA);
8652                                                         auth_keyid = chk->auth_keyid;
8653                                                         override_ok = 0;
8654                                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8655                                                 } else if (override_ok) {
8656                                                         /*
8657                                                          * use this data's
8658                                                          * keyid
8659                                                          */
8660                                                         auth_keyid = chk->auth_keyid;
8661                                                         override_ok = 0;
8662                                                 } else if (auth_keyid != chk->auth_keyid) {
8663                                                         /*
8664                                                          * different keyid,
8665                                                          * so done bundling
8666                                                          */
8667                                                         break;
8668                                                 }
8669                                         }
8670                                         outchain = sctp_copy_mbufchain(chk->data, outchain, &endoutchain, 0,
8671                                             chk->send_size, chk->copy_by_ref);
8672                                         if (outchain == NULL) {
8673                                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "No memory?\n");
8674                                                 if (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
8675                                                         sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
8676                                                 }
8677                                                 *reason_code = 3;
8678                                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
8679                                                 return (ENOMEM);
8680                                         }
8681                                         /* upate our MTU size */
8682                                         /* Do clear IP_DF ? */
8683                                         if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
8684                                                 no_fragmentflg = 0;
8685                                         }
8686                                         /* unsigned subtraction of mtu */
8687                                         if (mtu > chk->send_size)
8688                                                 mtu -= chk->send_size;
8689                                         else
8690                                                 mtu = 0;
8691                                         /* unsigned subtraction of r_mtu */
8692                                         if (r_mtu > chk->send_size)
8693                                                 r_mtu -= chk->send_size;
8694                                         else
8695                                                 r_mtu = 0;
8696
8697                                         to_out += chk->send_size;
8698                                         if ((to_out > mx_mtu) && no_fragmentflg) {
8699 #ifdef INVARIANTS
8700                                                 panic("Exceeding mtu of %d out size is %d", mx_mtu, to_out);
8701 #else
8702                                                 SCTP_PRINTF("Exceeding mtu of %d out size is %d\n",
8703                                                     mx_mtu, to_out);
8704 #endif
8705                                         }
8706                                         chk->window_probe = 0;
8707                                         data_list[bundle_at++] = chk;
8708                                         if (bundle_at >= SCTP_MAX_DATA_BUNDLING) {
8709                                                 break;
8710                                         }
8711                                         if (chk->sent == SCTP_DATAGRAM_UNSENT) {
8712                                                 if ((chk->rec.data.rcv_flags & SCTP_DATA_UNORDERED) == 0) {
8713                                                         SCTP_STAT_INCR_COUNTER64(sctps_outorderchunks);
8714                                                 } else {
8715                                                         SCTP_STAT_INCR_COUNTER64(sctps_outunorderchunks);
8716                                                 }
8717                                                 if (((chk->rec.data.rcv_flags & SCTP_DATA_LAST_FRAG) == SCTP_DATA_LAST_FRAG) &&
8718                                                     ((chk->rec.data.rcv_flags & SCTP_DATA_FIRST_FRAG) == 0))
8719                                                         /*
8720                                                          * Count number of
8721                                                          * user msg's that
8722                                                          * were fragmented
8723                                                          * we do this by
8724                                                          * counting when we
8725                                                          * see a LAST
8726                                                          * fragment only.
8727                                                          */
8728                                                         SCTP_STAT_INCR_COUNTER64(sctps_fragusrmsgs);
8729                                         }
8730                                         if ((mtu == 0) || (r_mtu == 0) || (one_chunk)) {
8731                                                 if ((one_chunk) && (stcb->asoc.total_flight == 0)) {
8732                                                         data_list[0]->window_probe = 1;
8733                                                         net->window_probe = 1;
8734                                                 }
8735                                                 break;
8736                                         }
8737                                 } else {
8738                                         /*
8739                                          * Must be sent in order of the
8740                                          * TSN's (on a network)
8741                                          */
8742                                         break;
8743                                 }
8744                         }       /* for (chunk gather loop for this net) */
8745                 }               /* if asoc.state OPEN */
8746 no_data_fill:
8747                 /* Is there something to send for this destination? */
8748                 if (outchain) {
8749                         /* We may need to start a control timer or two */
8750                         if (asconf) {
8751                                 sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp,
8752                                     stcb, net);
8753                                 /*
8754                                  * do NOT clear the asconf flag as it is
8755                                  * used to do appropriate source address
8756                                  * selection.
8757                                  */
8758                         }
8759                         if (cookie) {
8760                                 sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, inp, stcb, net);
8761                                 cookie = 0;
8762                         }
8763                         /* must start a send timer if data is being sent */
8764                         if (bundle_at && (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer))) {
8765                                 /*
8766                                  * no timer running on this destination
8767                                  * restart it.
8768                                  */
8769                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
8770                         }
8771                         if (bundle_at || hbflag) {
8772                                 /* For data/asconf and hb set time */
8773                                 if (*now_filled == 0) {
8774                                         (void)SCTP_GETTIME_TIMEVAL(now);
8775                                         *now_filled = 1;
8776                                 }
8777                                 net->last_sent_time = *now;
8778                         }
8779                         /* Now send it, if there is anything to send :> */
8780                         if ((error = sctp_lowlevel_chunk_output(inp,
8781                             stcb,
8782                             net,
8783                             (struct sockaddr *)&net->ro._l_addr,
8784                             outchain,
8785                             auth_offset,
8786                             auth,
8787                             auth_keyid,
8788                             no_fragmentflg,
8789                             bundle_at,
8790                             asconf,
8791                             inp->sctp_lport, stcb->rport,
8792                             htonl(stcb->asoc.peer_vtag),
8793                             net->port, NULL,
8794                             0, 0,
8795                             so_locked))) {
8796                                 /* error, we could not output */
8797                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
8798                                 if (from_where == 0) {
8799                                         SCTP_STAT_INCR(sctps_lowlevelerrusr);
8800                                 }
8801                                 if (error == ENOBUFS) {
8802                                         asoc->ifp_had_enobuf = 1;
8803                                         SCTP_STAT_INCR(sctps_lowlevelerr);
8804                                 }
8805                                 if (error == EHOSTUNREACH) {
8806                                         /*
8807                                          * Destination went unreachable
8808                                          * during this send
8809                                          */
8810                                         sctp_move_chunks_from_net(stcb, net);
8811                                 }
8812                                 *reason_code = 6;
8813                                 /*-
8814                                  * I add this line to be paranoid. As far as
8815                                  * I can tell the continue, takes us back to
8816                                  * the top of the for, but just to make sure
8817                                  * I will reset these again here.
8818                                  */
8819                                 ctl_cnt = 0;
8820                                 continue;       /* This takes us back to the
8821                                                  * for() for the nets. */
8822                         } else {
8823                                 asoc->ifp_had_enobuf = 0;
8824                         }
8825                         endoutchain = NULL;
8826                         auth = NULL;
8827                         auth_offset = 0;
8828                         if (!no_out_cnt) {
8829                                 *num_out += (ctl_cnt + bundle_at);
8830                         }
8831                         if (bundle_at) {
8832                                 /* setup for a RTO measurement */
8833                                 tsns_sent = data_list[0]->rec.data.tsn;
8834                                 /* fill time if not already filled */
8835                                 if (*now_filled == 0) {
8836                                         (void)SCTP_GETTIME_TIMEVAL(&asoc->time_last_sent);
8837                                         *now_filled = 1;
8838                                         *now = asoc->time_last_sent;
8839                                 } else {
8840                                         asoc->time_last_sent = *now;
8841                                 }
8842                                 if (net->rto_needed) {
8843                                         data_list[0]->do_rtt = 1;
8844                                         net->rto_needed = 0;
8845                                 }
8846                                 SCTP_STAT_INCR_BY(sctps_senddata, bundle_at);
8847                                 sctp_clean_up_datalist(stcb, asoc, data_list, bundle_at, net);
8848                         }
8849                         if (one_chunk) {
8850                                 break;
8851                         }
8852                 }
8853                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
8854                         sctp_log_cwnd(stcb, net, tsns_sent, SCTP_CWND_LOG_FROM_SEND);
8855                 }
8856         }
8857         if (old_start_at == NULL) {
8858                 old_start_at = start_at;
8859                 start_at = TAILQ_FIRST(&asoc->nets);
8860                 if (old_start_at)
8861                         goto again_one_more_time;
8862         }
8863
8864         /*
8865          * At the end there should be no NON timed chunks hanging on this
8866          * queue.
8867          */
8868         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
8869                 sctp_log_cwnd(stcb, net, *num_out, SCTP_CWND_LOG_FROM_SEND);
8870         }
8871         if ((*num_out == 0) && (*reason_code == 0)) {
8872                 *reason_code = 4;
8873         } else {
8874                 *reason_code = 5;
8875         }
8876         sctp_clean_up_ctl(stcb, asoc, so_locked);
8877         return (0);
8878 }
8879
8880 void
8881 sctp_queue_op_err(struct sctp_tcb *stcb, struct mbuf *op_err)
8882 {
8883         /*-
8884          * Prepend a OPERATIONAL_ERROR chunk header and put on the end of
8885          * the control chunk queue.
8886          */
8887         struct sctp_chunkhdr *hdr;
8888         struct sctp_tmit_chunk *chk;
8889         struct mbuf *mat, *last_mbuf;
8890         uint32_t chunk_length;
8891         uint16_t padding_length;
8892
8893         SCTP_TCB_LOCK_ASSERT(stcb);
8894         SCTP_BUF_PREPEND(op_err, sizeof(struct sctp_chunkhdr), M_NOWAIT);
8895         if (op_err == NULL) {
8896                 return;
8897         }
8898         last_mbuf = NULL;
8899         chunk_length = 0;
8900         for (mat = op_err; mat != NULL; mat = SCTP_BUF_NEXT(mat)) {
8901                 chunk_length += SCTP_BUF_LEN(mat);
8902                 if (SCTP_BUF_NEXT(mat) == NULL) {
8903                         last_mbuf = mat;
8904                 }
8905         }
8906         if (chunk_length > SCTP_MAX_CHUNK_LENGTH) {
8907                 sctp_m_freem(op_err);
8908                 return;
8909         }
8910         padding_length = chunk_length % 4;
8911         if (padding_length != 0) {
8912                 padding_length = 4 - padding_length;
8913         }
8914         if (padding_length != 0) {
8915                 if (sctp_add_pad_tombuf(last_mbuf, padding_length) == NULL) {
8916                         sctp_m_freem(op_err);
8917                         return;
8918                 }
8919         }
8920         sctp_alloc_a_chunk(stcb, chk);
8921         if (chk == NULL) {
8922                 /* no memory */
8923                 sctp_m_freem(op_err);
8924                 return;
8925         }
8926         chk->copy_by_ref = 0;
8927         chk->rec.chunk_id.id = SCTP_OPERATION_ERROR;
8928         chk->rec.chunk_id.can_take_data = 0;
8929         chk->flags = 0;
8930         chk->send_size = (uint16_t)chunk_length;
8931         chk->sent = SCTP_DATAGRAM_UNSENT;
8932         chk->snd_count = 0;
8933         chk->asoc = &stcb->asoc;
8934         chk->data = op_err;
8935         chk->whoTo = NULL;
8936         hdr = mtod(op_err, struct sctp_chunkhdr *);
8937         hdr->chunk_type = SCTP_OPERATION_ERROR;
8938         hdr->chunk_flags = 0;
8939         hdr->chunk_length = htons(chk->send_size);
8940         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
8941         chk->asoc->ctrl_queue_cnt++;
8942 }
8943
8944 int
8945 sctp_send_cookie_echo(struct mbuf *m,
8946     int offset, int limit,
8947     struct sctp_tcb *stcb,
8948     struct sctp_nets *net)
8949 {
8950         /*-
8951          * pull out the cookie and put it at the front of the control chunk
8952          * queue.
8953          */
8954         int at;
8955         struct mbuf *cookie;
8956         struct sctp_paramhdr param, *phdr;
8957         struct sctp_chunkhdr *hdr;
8958         struct sctp_tmit_chunk *chk;
8959         uint16_t ptype, plen;
8960
8961         SCTP_TCB_LOCK_ASSERT(stcb);
8962         /* First find the cookie in the param area */
8963         cookie = NULL;
8964         at = offset + sizeof(struct sctp_init_chunk);
8965         for (;;) {
8966                 phdr = sctp_get_next_param(m, at, &param, sizeof(param));
8967                 if (phdr == NULL) {
8968                         return (-3);
8969                 }
8970                 ptype = ntohs(phdr->param_type);
8971                 plen = ntohs(phdr->param_length);
8972                 if (plen < sizeof(struct sctp_paramhdr)) {
8973                         return (-6);
8974                 }
8975                 if (ptype == SCTP_STATE_COOKIE) {
8976                         int pad;
8977
8978                         /* found the cookie */
8979                         if (at + plen > limit) {
8980                                 return (-7);
8981                         }
8982                         cookie = SCTP_M_COPYM(m, at, plen, M_NOWAIT);
8983                         if (cookie == NULL) {
8984                                 /* No memory */
8985                                 return (-2);
8986                         }
8987                         if ((pad = (plen % 4)) > 0) {
8988                                 pad = 4 - pad;
8989                         }
8990                         if (pad > 0) {
8991                                 if (sctp_pad_lastmbuf(cookie, pad, NULL) == NULL) {
8992                                         return (-8);
8993                                 }
8994                         }
8995 #ifdef SCTP_MBUF_LOGGING
8996                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
8997                                 sctp_log_mbc(cookie, SCTP_MBUF_ICOPY);
8998                         }
8999 #endif
9000                         break;
9001                 }
9002                 at += SCTP_SIZE32(plen);
9003         }
9004         /* ok, we got the cookie lets change it into a cookie echo chunk */
9005         /* first the change from param to cookie */
9006         hdr = mtod(cookie, struct sctp_chunkhdr *);
9007         hdr->chunk_type = SCTP_COOKIE_ECHO;
9008         hdr->chunk_flags = 0;
9009         /* get the chunk stuff now and place it in the FRONT of the queue */
9010         sctp_alloc_a_chunk(stcb, chk);
9011         if (chk == NULL) {
9012                 /* no memory */
9013                 sctp_m_freem(cookie);
9014                 return (-5);
9015         }
9016         chk->copy_by_ref = 0;
9017         chk->rec.chunk_id.id = SCTP_COOKIE_ECHO;
9018         chk->rec.chunk_id.can_take_data = 0;
9019         chk->flags = CHUNK_FLAGS_FRAGMENT_OK;
9020         chk->send_size = SCTP_SIZE32(plen);
9021         chk->sent = SCTP_DATAGRAM_UNSENT;
9022         chk->snd_count = 0;
9023         chk->asoc = &stcb->asoc;
9024         chk->data = cookie;
9025         chk->whoTo = net;
9026         atomic_add_int(&chk->whoTo->ref_count, 1);
9027         TAILQ_INSERT_HEAD(&chk->asoc->control_send_queue, chk, sctp_next);
9028         chk->asoc->ctrl_queue_cnt++;
9029         return (0);
9030 }
9031
9032 void
9033 sctp_send_heartbeat_ack(struct sctp_tcb *stcb,
9034     struct mbuf *m,
9035     int offset,
9036     int chk_length,
9037     struct sctp_nets *net)
9038 {
9039         /*
9040          * take a HB request and make it into a HB ack and send it.
9041          */
9042         struct mbuf *outchain;
9043         struct sctp_chunkhdr *chdr;
9044         struct sctp_tmit_chunk *chk;
9045
9046         if (net == NULL)
9047                 /* must have a net pointer */
9048                 return;
9049
9050         outchain = SCTP_M_COPYM(m, offset, chk_length, M_NOWAIT);
9051         if (outchain == NULL) {
9052                 /* gak out of memory */
9053                 return;
9054         }
9055 #ifdef SCTP_MBUF_LOGGING
9056         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
9057                 sctp_log_mbc(outchain, SCTP_MBUF_ICOPY);
9058         }
9059 #endif
9060         chdr = mtod(outchain, struct sctp_chunkhdr *);
9061         chdr->chunk_type = SCTP_HEARTBEAT_ACK;
9062         chdr->chunk_flags = 0;
9063         if (chk_length % 4 != 0) {
9064                 sctp_pad_lastmbuf(outchain, 4 - (chk_length % 4), NULL);
9065         }
9066         sctp_alloc_a_chunk(stcb, chk);
9067         if (chk == NULL) {
9068                 /* no memory */
9069                 sctp_m_freem(outchain);
9070                 return;
9071         }
9072         chk->copy_by_ref = 0;
9073         chk->rec.chunk_id.id = SCTP_HEARTBEAT_ACK;
9074         chk->rec.chunk_id.can_take_data = 1;
9075         chk->flags = 0;
9076         chk->send_size = chk_length;
9077         chk->sent = SCTP_DATAGRAM_UNSENT;
9078         chk->snd_count = 0;
9079         chk->asoc = &stcb->asoc;
9080         chk->data = outchain;
9081         chk->whoTo = net;
9082         atomic_add_int(&chk->whoTo->ref_count, 1);
9083         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9084         chk->asoc->ctrl_queue_cnt++;
9085 }
9086
9087 void
9088 sctp_send_cookie_ack(struct sctp_tcb *stcb)
9089 {
9090         /* formulate and queue a cookie-ack back to sender */
9091         struct mbuf *cookie_ack;
9092         struct sctp_chunkhdr *hdr;
9093         struct sctp_tmit_chunk *chk;
9094
9095         SCTP_TCB_LOCK_ASSERT(stcb);
9096
9097         cookie_ack = sctp_get_mbuf_for_msg(sizeof(struct sctp_chunkhdr), 0, M_NOWAIT, 1, MT_HEADER);
9098         if (cookie_ack == NULL) {
9099                 /* no mbuf's */
9100                 return;
9101         }
9102         SCTP_BUF_RESV_UF(cookie_ack, SCTP_MIN_OVERHEAD);
9103         sctp_alloc_a_chunk(stcb, chk);
9104         if (chk == NULL) {
9105                 /* no memory */
9106                 sctp_m_freem(cookie_ack);
9107                 return;
9108         }
9109         chk->copy_by_ref = 0;
9110         chk->rec.chunk_id.id = SCTP_COOKIE_ACK;
9111         chk->rec.chunk_id.can_take_data = 1;
9112         chk->flags = 0;
9113         chk->send_size = sizeof(struct sctp_chunkhdr);
9114         chk->sent = SCTP_DATAGRAM_UNSENT;
9115         chk->snd_count = 0;
9116         chk->asoc = &stcb->asoc;
9117         chk->data = cookie_ack;
9118         if (chk->asoc->last_control_chunk_from != NULL) {
9119                 chk->whoTo = chk->asoc->last_control_chunk_from;
9120                 atomic_add_int(&chk->whoTo->ref_count, 1);
9121         } else {
9122                 chk->whoTo = NULL;
9123         }
9124         hdr = mtod(cookie_ack, struct sctp_chunkhdr *);
9125         hdr->chunk_type = SCTP_COOKIE_ACK;
9126         hdr->chunk_flags = 0;
9127         hdr->chunk_length = htons(chk->send_size);
9128         SCTP_BUF_LEN(cookie_ack) = chk->send_size;
9129         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9130         chk->asoc->ctrl_queue_cnt++;
9131         return;
9132 }
9133
9134 void
9135 sctp_send_shutdown_ack(struct sctp_tcb *stcb, struct sctp_nets *net)
9136 {
9137         /* formulate and queue a SHUTDOWN-ACK back to the sender */
9138         struct mbuf *m_shutdown_ack;
9139         struct sctp_shutdown_ack_chunk *ack_cp;
9140         struct sctp_tmit_chunk *chk;
9141
9142         m_shutdown_ack = sctp_get_mbuf_for_msg(sizeof(struct sctp_shutdown_ack_chunk), 0, M_NOWAIT, 1, MT_HEADER);
9143         if (m_shutdown_ack == NULL) {
9144                 /* no mbuf's */
9145                 return;
9146         }
9147         SCTP_BUF_RESV_UF(m_shutdown_ack, SCTP_MIN_OVERHEAD);
9148         sctp_alloc_a_chunk(stcb, chk);
9149         if (chk == NULL) {
9150                 /* no memory */
9151                 sctp_m_freem(m_shutdown_ack);
9152                 return;
9153         }
9154         chk->copy_by_ref = 0;
9155         chk->rec.chunk_id.id = SCTP_SHUTDOWN_ACK;
9156         chk->rec.chunk_id.can_take_data = 1;
9157         chk->flags = 0;
9158         chk->send_size = sizeof(struct sctp_chunkhdr);
9159         chk->sent = SCTP_DATAGRAM_UNSENT;
9160         chk->snd_count = 0;
9161         chk->asoc = &stcb->asoc;
9162         chk->data = m_shutdown_ack;
9163         chk->whoTo = net;
9164         if (chk->whoTo) {
9165                 atomic_add_int(&chk->whoTo->ref_count, 1);
9166         }
9167         ack_cp = mtod(m_shutdown_ack, struct sctp_shutdown_ack_chunk *);
9168         ack_cp->ch.chunk_type = SCTP_SHUTDOWN_ACK;
9169         ack_cp->ch.chunk_flags = 0;
9170         ack_cp->ch.chunk_length = htons(chk->send_size);
9171         SCTP_BUF_LEN(m_shutdown_ack) = chk->send_size;
9172         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9173         chk->asoc->ctrl_queue_cnt++;
9174         return;
9175 }
9176
9177 void
9178 sctp_send_shutdown(struct sctp_tcb *stcb, struct sctp_nets *net)
9179 {
9180         /* formulate and queue a SHUTDOWN to the sender */
9181         struct mbuf *m_shutdown;
9182         struct sctp_shutdown_chunk *shutdown_cp;
9183         struct sctp_tmit_chunk *chk;
9184
9185         TAILQ_FOREACH(chk, &stcb->asoc.control_send_queue, sctp_next) {
9186                 if (chk->rec.chunk_id.id == SCTP_SHUTDOWN) {
9187                         /* We already have a SHUTDOWN queued. Reuse it. */
9188                         if (chk->whoTo) {
9189                                 sctp_free_remote_addr(chk->whoTo);
9190                                 chk->whoTo = NULL;
9191                         }
9192                         break;
9193                 }
9194         }
9195         if (chk == NULL) {
9196                 m_shutdown = sctp_get_mbuf_for_msg(sizeof(struct sctp_shutdown_chunk), 0, M_NOWAIT, 1, MT_HEADER);
9197                 if (m_shutdown == NULL) {
9198                         /* no mbuf's */
9199                         return;
9200                 }
9201                 SCTP_BUF_RESV_UF(m_shutdown, SCTP_MIN_OVERHEAD);
9202                 sctp_alloc_a_chunk(stcb, chk);
9203                 if (chk == NULL) {
9204                         /* no memory */
9205                         sctp_m_freem(m_shutdown);
9206                         return;
9207                 }
9208                 chk->copy_by_ref = 0;
9209                 chk->rec.chunk_id.id = SCTP_SHUTDOWN;
9210                 chk->rec.chunk_id.can_take_data = 1;
9211                 chk->flags = 0;
9212                 chk->send_size = sizeof(struct sctp_shutdown_chunk);
9213                 chk->sent = SCTP_DATAGRAM_UNSENT;
9214                 chk->snd_count = 0;
9215                 chk->asoc = &stcb->asoc;
9216                 chk->data = m_shutdown;
9217                 chk->whoTo = net;
9218                 if (chk->whoTo) {
9219                         atomic_add_int(&chk->whoTo->ref_count, 1);
9220                 }
9221                 shutdown_cp = mtod(m_shutdown, struct sctp_shutdown_chunk *);
9222                 shutdown_cp->ch.chunk_type = SCTP_SHUTDOWN;
9223                 shutdown_cp->ch.chunk_flags = 0;
9224                 shutdown_cp->ch.chunk_length = htons(chk->send_size);
9225                 shutdown_cp->cumulative_tsn_ack = htonl(stcb->asoc.cumulative_tsn);
9226                 SCTP_BUF_LEN(m_shutdown) = chk->send_size;
9227                 TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9228                 chk->asoc->ctrl_queue_cnt++;
9229         } else {
9230                 TAILQ_REMOVE(&stcb->asoc.control_send_queue, chk, sctp_next);
9231                 chk->whoTo = net;
9232                 if (chk->whoTo) {
9233                         atomic_add_int(&chk->whoTo->ref_count, 1);
9234                 }
9235                 shutdown_cp = mtod(chk->data, struct sctp_shutdown_chunk *);
9236                 shutdown_cp->cumulative_tsn_ack = htonl(stcb->asoc.cumulative_tsn);
9237                 TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
9238         }
9239         return;
9240 }
9241
9242 void
9243 sctp_send_asconf(struct sctp_tcb *stcb, struct sctp_nets *net, int addr_locked)
9244 {
9245         /*
9246          * formulate and queue an ASCONF to the peer. ASCONF parameters
9247          * should be queued on the assoc queue.
9248          */
9249         struct sctp_tmit_chunk *chk;
9250         struct mbuf *m_asconf;
9251         int len;
9252
9253         SCTP_TCB_LOCK_ASSERT(stcb);
9254
9255         if ((!TAILQ_EMPTY(&stcb->asoc.asconf_send_queue)) &&
9256             (!sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_MULTIPLE_ASCONFS))) {
9257                 /* can't send a new one if there is one in flight already */
9258                 return;
9259         }
9260
9261         /* compose an ASCONF chunk, maximum length is PMTU */
9262         m_asconf = sctp_compose_asconf(stcb, &len, addr_locked);
9263         if (m_asconf == NULL) {
9264                 return;
9265         }
9266
9267         sctp_alloc_a_chunk(stcb, chk);
9268         if (chk == NULL) {
9269                 /* no memory */
9270                 sctp_m_freem(m_asconf);
9271                 return;
9272         }
9273
9274         chk->copy_by_ref = 0;
9275         chk->rec.chunk_id.id = SCTP_ASCONF;
9276         chk->rec.chunk_id.can_take_data = 0;
9277         chk->flags = CHUNK_FLAGS_FRAGMENT_OK;
9278         chk->data = m_asconf;
9279         chk->send_size = len;
9280         chk->sent = SCTP_DATAGRAM_UNSENT;
9281         chk->snd_count = 0;
9282         chk->asoc = &stcb->asoc;
9283         chk->whoTo = net;
9284         if (chk->whoTo) {
9285                 atomic_add_int(&chk->whoTo->ref_count, 1);
9286         }
9287         TAILQ_INSERT_TAIL(&chk->asoc->asconf_send_queue, chk, sctp_next);
9288         chk->asoc->ctrl_queue_cnt++;
9289         return;
9290 }
9291
9292 void
9293 sctp_send_asconf_ack(struct sctp_tcb *stcb)
9294 {
9295         /*
9296          * formulate and queue a asconf-ack back to sender. the asconf-ack
9297          * must be stored in the tcb.
9298          */
9299         struct sctp_tmit_chunk *chk;
9300         struct sctp_asconf_ack *ack, *latest_ack;
9301         struct mbuf *m_ack;
9302         struct sctp_nets *net = NULL;
9303
9304         SCTP_TCB_LOCK_ASSERT(stcb);
9305         /* Get the latest ASCONF-ACK */
9306         latest_ack = TAILQ_LAST(&stcb->asoc.asconf_ack_sent, sctp_asconf_ackhead);
9307         if (latest_ack == NULL) {
9308                 return;
9309         }
9310         if (latest_ack->last_sent_to != NULL &&
9311             latest_ack->last_sent_to == stcb->asoc.last_control_chunk_from) {
9312                 /* we're doing a retransmission */
9313                 net = sctp_find_alternate_net(stcb, stcb->asoc.last_control_chunk_from, 0);
9314                 if (net == NULL) {
9315                         /* no alternate */
9316                         if (stcb->asoc.last_control_chunk_from == NULL) {
9317                                 if (stcb->asoc.alternate) {
9318                                         net = stcb->asoc.alternate;
9319                                 } else {
9320                                         net = stcb->asoc.primary_destination;
9321                                 }
9322                         } else {
9323                                 net = stcb->asoc.last_control_chunk_from;
9324                         }
9325                 }
9326         } else {
9327                 /* normal case */
9328                 if (stcb->asoc.last_control_chunk_from == NULL) {
9329                         if (stcb->asoc.alternate) {
9330                                 net = stcb->asoc.alternate;
9331                         } else {
9332                                 net = stcb->asoc.primary_destination;
9333                         }
9334                 } else {
9335                         net = stcb->asoc.last_control_chunk_from;
9336                 }
9337         }
9338         latest_ack->last_sent_to = net;
9339
9340         TAILQ_FOREACH(ack, &stcb->asoc.asconf_ack_sent, next) {
9341                 if (ack->data == NULL) {
9342                         continue;
9343                 }
9344
9345                 /* copy the asconf_ack */
9346                 m_ack = SCTP_M_COPYM(ack->data, 0, M_COPYALL, M_NOWAIT);
9347                 if (m_ack == NULL) {
9348                         /* couldn't copy it */
9349                         return;
9350                 }
9351 #ifdef SCTP_MBUF_LOGGING
9352                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
9353                         sctp_log_mbc(m_ack, SCTP_MBUF_ICOPY);
9354                 }
9355 #endif
9356
9357                 sctp_alloc_a_chunk(stcb, chk);
9358                 if (chk == NULL) {
9359                         /* no memory */
9360                         if (m_ack)
9361                                 sctp_m_freem(m_ack);
9362                         return;
9363                 }
9364                 chk->copy_by_ref = 0;
9365                 chk->rec.chunk_id.id = SCTP_ASCONF_ACK;
9366                 chk->rec.chunk_id.can_take_data = 1;
9367                 chk->flags = CHUNK_FLAGS_FRAGMENT_OK;
9368                 chk->whoTo = net;
9369                 if (chk->whoTo) {
9370                         atomic_add_int(&chk->whoTo->ref_count, 1);
9371                 }
9372                 chk->data = m_ack;
9373                 chk->send_size = ack->len;
9374                 chk->sent = SCTP_DATAGRAM_UNSENT;
9375                 chk->snd_count = 0;
9376                 chk->asoc = &stcb->asoc;
9377
9378                 TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9379                 chk->asoc->ctrl_queue_cnt++;
9380         }
9381         return;
9382 }
9383
9384 static int
9385 sctp_chunk_retransmission(struct sctp_inpcb *inp,
9386     struct sctp_tcb *stcb,
9387     struct sctp_association *asoc,
9388     int *cnt_out, struct timeval *now, int *now_filled, int *fr_done, int so_locked)
9389 {
9390         /*-
9391          * send out one MTU of retransmission. If fast_retransmit is
9392          * happening we ignore the cwnd. Otherwise we obey the cwnd and
9393          * rwnd. For a Cookie or Asconf in the control chunk queue we
9394          * retransmit them by themselves.
9395          *
9396          * For data chunks we will pick out the lowest TSN's in the sent_queue
9397          * marked for resend and bundle them all together (up to a MTU of
9398          * destination). The address to send to should have been
9399          * selected/changed where the retransmission was marked (i.e. in FR
9400          * or t3-timeout routines).
9401          */
9402         struct sctp_tmit_chunk *data_list[SCTP_MAX_DATA_BUNDLING];
9403         struct sctp_tmit_chunk *chk, *fwd;
9404         struct mbuf *m, *endofchain;
9405         struct sctp_nets *net = NULL;
9406         uint32_t tsns_sent = 0;
9407         int no_fragmentflg, bundle_at, cnt_thru;
9408         unsigned int mtu;
9409         int error, i, one_chunk, fwd_tsn, ctl_cnt, tmr_started;
9410         struct sctp_auth_chunk *auth = NULL;
9411         uint32_t auth_offset = 0;
9412         uint16_t auth_keyid;
9413         int override_ok = 1;
9414         int data_auth_reqd = 0;
9415         uint32_t dmtu = 0;
9416
9417         SCTP_TCB_LOCK_ASSERT(stcb);
9418         tmr_started = ctl_cnt = 0;
9419         no_fragmentflg = 1;
9420         fwd_tsn = 0;
9421         *cnt_out = 0;
9422         fwd = NULL;
9423         endofchain = m = NULL;
9424         auth_keyid = stcb->asoc.authinfo.active_keyid;
9425 #ifdef SCTP_AUDITING_ENABLED
9426         sctp_audit_log(0xC3, 1);
9427 #endif
9428         if ((TAILQ_EMPTY(&asoc->sent_queue)) &&
9429             (TAILQ_EMPTY(&asoc->control_send_queue))) {
9430                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "SCTP hits empty queue with cnt set to %d?\n",
9431                     asoc->sent_queue_retran_cnt);
9432                 asoc->sent_queue_cnt = 0;
9433                 asoc->sent_queue_cnt_removeable = 0;
9434                 /* send back 0/0 so we enter normal transmission */
9435                 *cnt_out = 0;
9436                 return (0);
9437         }
9438         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
9439                 if ((chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) ||
9440                     (chk->rec.chunk_id.id == SCTP_STREAM_RESET) ||
9441                     (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN)) {
9442                         if (chk->sent != SCTP_DATAGRAM_RESEND) {
9443                                 continue;
9444                         }
9445                         if (chk->rec.chunk_id.id == SCTP_STREAM_RESET) {
9446                                 if (chk != asoc->str_reset) {
9447                                         /*
9448                                          * not eligible for retran if its
9449                                          * not ours
9450                                          */
9451                                         continue;
9452                                 }
9453                         }
9454                         ctl_cnt++;
9455                         if (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN) {
9456                                 fwd_tsn = 1;
9457                         }
9458                         /*
9459                          * Add an AUTH chunk, if chunk requires it save the
9460                          * offset into the chain for AUTH
9461                          */
9462                         if ((auth == NULL) &&
9463                             (sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
9464                             stcb->asoc.peer_auth_chunks))) {
9465                                 m = sctp_add_auth_chunk(m, &endofchain,
9466                                     &auth, &auth_offset,
9467                                     stcb,
9468                                     chk->rec.chunk_id.id);
9469                                 SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
9470                         }
9471                         m = sctp_copy_mbufchain(chk->data, m, &endofchain, 0, chk->send_size, chk->copy_by_ref);
9472                         break;
9473                 }
9474         }
9475         one_chunk = 0;
9476         cnt_thru = 0;
9477         /* do we have control chunks to retransmit? */
9478         if (m != NULL) {
9479                 /* Start a timer no matter if we succeed or fail */
9480                 if (chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
9481                         sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, inp, stcb, chk->whoTo);
9482                 } else if (chk->rec.chunk_id.id == SCTP_ASCONF)
9483                         sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp, stcb, chk->whoTo);
9484                 chk->snd_count++;       /* update our count */
9485                 if ((error = sctp_lowlevel_chunk_output(inp, stcb, chk->whoTo,
9486                     (struct sockaddr *)&chk->whoTo->ro._l_addr, m,
9487                     auth_offset, auth, stcb->asoc.authinfo.active_keyid,
9488                     no_fragmentflg, 0, 0,
9489                     inp->sctp_lport, stcb->rport, htonl(stcb->asoc.peer_vtag),
9490                     chk->whoTo->port, NULL,
9491                     0, 0,
9492                     so_locked))) {
9493                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
9494                         if (error == ENOBUFS) {
9495                                 asoc->ifp_had_enobuf = 1;
9496                                 SCTP_STAT_INCR(sctps_lowlevelerr);
9497                         }
9498                         return (error);
9499                 } else {
9500                         asoc->ifp_had_enobuf = 0;
9501                 }
9502                 endofchain = NULL;
9503                 auth = NULL;
9504                 auth_offset = 0;
9505                 /*
9506                  * We don't want to mark the net->sent time here since this
9507                  * we use this for HB and retrans cannot measure RTT
9508                  */
9509                 /* (void)SCTP_GETTIME_TIMEVAL(&chk->whoTo->last_sent_time); */
9510                 *cnt_out += 1;
9511                 chk->sent = SCTP_DATAGRAM_SENT;
9512                 sctp_ucount_decr(stcb->asoc.sent_queue_retran_cnt);
9513                 if (fwd_tsn == 0) {
9514                         return (0);
9515                 } else {
9516                         /* Clean up the fwd-tsn list */
9517                         sctp_clean_up_ctl(stcb, asoc, so_locked);
9518                         return (0);
9519                 }
9520         }
9521         /*
9522          * Ok, it is just data retransmission we need to do or that and a
9523          * fwd-tsn with it all.
9524          */
9525         if (TAILQ_EMPTY(&asoc->sent_queue)) {
9526                 return (SCTP_RETRAN_DONE);
9527         }
9528         if ((SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED) ||
9529             (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_WAIT)) {
9530                 /* not yet open, resend the cookie and that is it */
9531                 return (1);
9532         }
9533 #ifdef SCTP_AUDITING_ENABLED
9534         sctp_auditing(20, inp, stcb, NULL);
9535 #endif
9536         data_auth_reqd = sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks);
9537         TAILQ_FOREACH(chk, &asoc->sent_queue, sctp_next) {
9538                 if (chk->sent != SCTP_DATAGRAM_RESEND) {
9539                         /* No, not sent to this net or not ready for rtx */
9540                         continue;
9541                 }
9542                 if (chk->data == NULL) {
9543                         SCTP_PRINTF("TSN:%x chk->snd_count:%d chk->sent:%d can't retran - no data\n",
9544                             chk->rec.data.tsn, chk->snd_count, chk->sent);
9545                         continue;
9546                 }
9547                 if ((SCTP_BASE_SYSCTL(sctp_max_retran_chunk)) &&
9548                     (chk->snd_count >= SCTP_BASE_SYSCTL(sctp_max_retran_chunk))) {
9549                         struct mbuf *op_err;
9550                         char msg[SCTP_DIAG_INFO_LEN];
9551
9552                         SCTP_SNPRINTF(msg, sizeof(msg), "TSN %8.8x retransmitted %d times, giving up",
9553                             chk->rec.data.tsn, chk->snd_count);
9554                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
9555                             msg);
9556                         atomic_add_int(&stcb->asoc.refcnt, 1);
9557                         sctp_abort_an_association(stcb->sctp_ep, stcb, op_err,
9558                             false, so_locked);
9559                         SCTP_TCB_LOCK(stcb);
9560                         atomic_subtract_int(&stcb->asoc.refcnt, 1);
9561                         return (SCTP_RETRAN_EXIT);
9562                 }
9563                 /* pick up the net */
9564                 net = chk->whoTo;
9565                 switch (net->ro._l_addr.sa.sa_family) {
9566 #ifdef INET
9567                 case AF_INET:
9568                         mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
9569                         break;
9570 #endif
9571 #ifdef INET6
9572                 case AF_INET6:
9573                         mtu = net->mtu - SCTP_MIN_OVERHEAD;
9574                         break;
9575 #endif
9576                 default:
9577                         /* TSNH */
9578                         mtu = net->mtu;
9579                         break;
9580                 }
9581
9582                 if ((asoc->peers_rwnd < mtu) && (asoc->total_flight > 0)) {
9583                         /* No room in peers rwnd */
9584                         uint32_t tsn;
9585
9586                         tsn = asoc->last_acked_seq + 1;
9587                         if (tsn == chk->rec.data.tsn) {
9588                                 /*
9589                                  * we make a special exception for this
9590                                  * case. The peer has no rwnd but is missing
9591                                  * the lowest chunk.. which is probably what
9592                                  * is holding up the rwnd.
9593                                  */
9594                                 goto one_chunk_around;
9595                         }
9596                         return (1);
9597                 }
9598 one_chunk_around:
9599                 if (asoc->peers_rwnd < mtu) {
9600                         one_chunk = 1;
9601                         if ((asoc->peers_rwnd == 0) &&
9602                             (asoc->total_flight == 0)) {
9603                                 chk->window_probe = 1;
9604                                 chk->whoTo->window_probe = 1;
9605                         }
9606                 }
9607 #ifdef SCTP_AUDITING_ENABLED
9608                 sctp_audit_log(0xC3, 2);
9609 #endif
9610                 bundle_at = 0;
9611                 m = NULL;
9612                 net->fast_retran_ip = 0;
9613                 if (chk->rec.data.doing_fast_retransmit == 0) {
9614                         /*
9615                          * if no FR in progress skip destination that have
9616                          * flight_size > cwnd.
9617                          */
9618                         if (net->flight_size >= net->cwnd) {
9619                                 continue;
9620                         }
9621                 } else {
9622                         /*
9623                          * Mark the destination net to have FR recovery
9624                          * limits put on it.
9625                          */
9626                         *fr_done = 1;
9627                         net->fast_retran_ip = 1;
9628                 }
9629
9630                 /*
9631                  * if no AUTH is yet included and this chunk requires it,
9632                  * make sure to account for it.  We don't apply the size
9633                  * until the AUTH chunk is actually added below in case
9634                  * there is no room for this chunk.
9635                  */
9636                 if (data_auth_reqd && (auth == NULL)) {
9637                         dmtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
9638                 } else
9639                         dmtu = 0;
9640
9641                 if ((chk->send_size <= (mtu - dmtu)) ||
9642                     (chk->flags & CHUNK_FLAGS_FRAGMENT_OK)) {
9643                         /* ok we will add this one */
9644                         if (data_auth_reqd) {
9645                                 if (auth == NULL) {
9646                                         m = sctp_add_auth_chunk(m,
9647                                             &endofchain,
9648                                             &auth,
9649                                             &auth_offset,
9650                                             stcb,
9651                                             SCTP_DATA);
9652                                         auth_keyid = chk->auth_keyid;
9653                                         override_ok = 0;
9654                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
9655                                 } else if (override_ok) {
9656                                         auth_keyid = chk->auth_keyid;
9657                                         override_ok = 0;
9658                                 } else if (chk->auth_keyid != auth_keyid) {
9659                                         /* different keyid, so done bundling */
9660                                         break;
9661                                 }
9662                         }
9663                         m = sctp_copy_mbufchain(chk->data, m, &endofchain, 0, chk->send_size, chk->copy_by_ref);
9664                         if (m == NULL) {
9665                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
9666                                 return (ENOMEM);
9667                         }
9668                         /* Do clear IP_DF ? */
9669                         if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
9670                                 no_fragmentflg = 0;
9671                         }
9672                         /* upate our MTU size */
9673                         if (mtu > (chk->send_size + dmtu))
9674                                 mtu -= (chk->send_size + dmtu);
9675                         else
9676                                 mtu = 0;
9677                         data_list[bundle_at++] = chk;
9678                         if (one_chunk && (asoc->total_flight <= 0)) {
9679                                 SCTP_STAT_INCR(sctps_windowprobed);
9680                         }
9681                 }
9682                 if (one_chunk == 0) {
9683                         /*
9684                          * now are there anymore forward from chk to pick
9685                          * up?
9686                          */
9687                         for (fwd = TAILQ_NEXT(chk, sctp_next); fwd != NULL; fwd = TAILQ_NEXT(fwd, sctp_next)) {
9688                                 if (fwd->sent != SCTP_DATAGRAM_RESEND) {
9689                                         /* Nope, not for retran */
9690                                         continue;
9691                                 }
9692                                 if (fwd->whoTo != net) {
9693                                         /* Nope, not the net in question */
9694                                         continue;
9695                                 }
9696                                 if (data_auth_reqd && (auth == NULL)) {
9697                                         dmtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
9698                                 } else
9699                                         dmtu = 0;
9700                                 if (fwd->send_size <= (mtu - dmtu)) {
9701                                         if (data_auth_reqd) {
9702                                                 if (auth == NULL) {
9703                                                         m = sctp_add_auth_chunk(m,
9704                                                             &endofchain,
9705                                                             &auth,
9706                                                             &auth_offset,
9707                                                             stcb,
9708                                                             SCTP_DATA);
9709                                                         auth_keyid = fwd->auth_keyid;
9710                                                         override_ok = 0;
9711                                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
9712                                                 } else if (override_ok) {
9713                                                         auth_keyid = fwd->auth_keyid;
9714                                                         override_ok = 0;
9715                                                 } else if (fwd->auth_keyid != auth_keyid) {
9716                                                         /*
9717                                                          * different keyid,
9718                                                          * so done bundling
9719                                                          */
9720                                                         break;
9721                                                 }
9722                                         }
9723                                         m = sctp_copy_mbufchain(fwd->data, m, &endofchain, 0, fwd->send_size, fwd->copy_by_ref);
9724                                         if (m == NULL) {
9725                                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
9726                                                 return (ENOMEM);
9727                                         }
9728                                         /* Do clear IP_DF ? */
9729                                         if (fwd->flags & CHUNK_FLAGS_FRAGMENT_OK) {
9730                                                 no_fragmentflg = 0;
9731                                         }
9732                                         /* upate our MTU size */
9733                                         if (mtu > (fwd->send_size + dmtu))
9734                                                 mtu -= (fwd->send_size + dmtu);
9735                                         else
9736                                                 mtu = 0;
9737                                         data_list[bundle_at++] = fwd;
9738                                         if (bundle_at >= SCTP_MAX_DATA_BUNDLING) {
9739                                                 break;
9740                                         }
9741                                 } else {
9742                                         /* can't fit so we are done */
9743                                         break;
9744                                 }
9745                         }
9746                 }
9747                 /* Is there something to send for this destination? */
9748                 if (m) {
9749                         /*
9750                          * No matter if we fail/or succeed we should start a
9751                          * timer. A failure is like a lost IP packet :-)
9752                          */
9753                         if (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
9754                                 /*
9755                                  * no timer running on this destination
9756                                  * restart it.
9757                                  */
9758                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
9759                                 tmr_started = 1;
9760                         }
9761                         /* Now lets send it, if there is anything to send :> */
9762                         if ((error = sctp_lowlevel_chunk_output(inp, stcb, net,
9763                             (struct sockaddr *)&net->ro._l_addr, m,
9764                             auth_offset, auth, auth_keyid,
9765                             no_fragmentflg, 0, 0,
9766                             inp->sctp_lport, stcb->rport, htonl(stcb->asoc.peer_vtag),
9767                             net->port, NULL,
9768                             0, 0,
9769                             so_locked))) {
9770                                 /* error, we could not output */
9771                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
9772                                 if (error == ENOBUFS) {
9773                                         asoc->ifp_had_enobuf = 1;
9774                                         SCTP_STAT_INCR(sctps_lowlevelerr);
9775                                 }
9776                                 return (error);
9777                         } else {
9778                                 asoc->ifp_had_enobuf = 0;
9779                         }
9780                         endofchain = NULL;
9781                         auth = NULL;
9782                         auth_offset = 0;
9783                         /* For HB's */
9784                         /*
9785                          * We don't want to mark the net->sent time here
9786                          * since this we use this for HB and retrans cannot
9787                          * measure RTT
9788                          */
9789                         /* (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time); */
9790
9791                         /* For auto-close */
9792                         cnt_thru++;
9793                         if (*now_filled == 0) {
9794                                 (void)SCTP_GETTIME_TIMEVAL(&asoc->time_last_sent);
9795                                 *now = asoc->time_last_sent;
9796                                 *now_filled = 1;
9797                         } else {
9798                                 asoc->time_last_sent = *now;
9799                         }
9800                         *cnt_out += bundle_at;
9801 #ifdef SCTP_AUDITING_ENABLED
9802                         sctp_audit_log(0xC4, bundle_at);
9803 #endif
9804                         if (bundle_at) {
9805                                 tsns_sent = data_list[0]->rec.data.tsn;
9806                         }
9807                         for (i = 0; i < bundle_at; i++) {
9808                                 SCTP_STAT_INCR(sctps_sendretransdata);
9809                                 data_list[i]->sent = SCTP_DATAGRAM_SENT;
9810                                 /*
9811                                  * When we have a revoked data, and we
9812                                  * retransmit it, then we clear the revoked
9813                                  * flag since this flag dictates if we
9814                                  * subtracted from the fs
9815                                  */
9816                                 if (data_list[i]->rec.data.chunk_was_revoked) {
9817                                         /* Deflate the cwnd */
9818                                         data_list[i]->whoTo->cwnd -= data_list[i]->book_size;
9819                                         data_list[i]->rec.data.chunk_was_revoked = 0;
9820                                 }
9821                                 data_list[i]->snd_count++;
9822                                 sctp_ucount_decr(asoc->sent_queue_retran_cnt);
9823                                 /* record the time */
9824                                 data_list[i]->sent_rcv_time = asoc->time_last_sent;
9825                                 if (data_list[i]->book_size_scale) {
9826                                         /*
9827                                          * need to double the book size on
9828                                          * this one
9829                                          */
9830                                         data_list[i]->book_size_scale = 0;
9831                                         /*
9832                                          * Since we double the booksize, we
9833                                          * must also double the output queue
9834                                          * size, since this get shrunk when
9835                                          * we free by this amount.
9836                                          */
9837                                         atomic_add_int(&((asoc)->total_output_queue_size), data_list[i]->book_size);
9838                                         data_list[i]->book_size *= 2;
9839                                 } else {
9840                                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_RWND_ENABLE) {
9841                                                 sctp_log_rwnd(SCTP_DECREASE_PEER_RWND,
9842                                                     asoc->peers_rwnd, data_list[i]->send_size, SCTP_BASE_SYSCTL(sctp_peer_chunk_oh));
9843                                         }
9844                                         asoc->peers_rwnd = sctp_sbspace_sub(asoc->peers_rwnd,
9845                                             (uint32_t)(data_list[i]->send_size +
9846                                             SCTP_BASE_SYSCTL(sctp_peer_chunk_oh)));
9847                                 }
9848                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
9849                                         sctp_misc_ints(SCTP_FLIGHT_LOG_UP_RSND,
9850                                             data_list[i]->whoTo->flight_size,
9851                                             data_list[i]->book_size,
9852                                             (uint32_t)(uintptr_t)data_list[i]->whoTo,
9853                                             data_list[i]->rec.data.tsn);
9854                                 }
9855                                 sctp_flight_size_increase(data_list[i]);
9856                                 sctp_total_flight_increase(stcb, data_list[i]);
9857                                 if (asoc->peers_rwnd < stcb->sctp_ep->sctp_ep.sctp_sws_sender) {
9858                                         /* SWS sender side engages */
9859                                         asoc->peers_rwnd = 0;
9860                                 }
9861                                 if ((i == 0) &&
9862                                     (data_list[i]->rec.data.doing_fast_retransmit)) {
9863                                         SCTP_STAT_INCR(sctps_sendfastretrans);
9864                                         if ((data_list[i] == TAILQ_FIRST(&asoc->sent_queue)) &&
9865                                             (tmr_started == 0)) {
9866                                                 /*-
9867                                                  * ok we just fast-retrans'd
9868                                                  * the lowest TSN, i.e the
9869                                                  * first on the list. In
9870                                                  * this case we want to give
9871                                                  * some more time to get a
9872                                                  * SACK back without a
9873                                                  * t3-expiring.
9874                                                  */
9875                                                 sctp_timer_stop(SCTP_TIMER_TYPE_SEND, inp, stcb, net,
9876                                                     SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_2);
9877                                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
9878                                         }
9879                                 }
9880                         }
9881                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
9882                                 sctp_log_cwnd(stcb, net, tsns_sent, SCTP_CWND_LOG_FROM_RESEND);
9883                         }
9884 #ifdef SCTP_AUDITING_ENABLED
9885                         sctp_auditing(21, inp, stcb, NULL);
9886 #endif
9887                 } else {
9888                         /* None will fit */
9889                         return (1);
9890                 }
9891                 if (asoc->sent_queue_retran_cnt <= 0) {
9892                         /* all done we have no more to retran */
9893                         asoc->sent_queue_retran_cnt = 0;
9894                         break;
9895                 }
9896                 if (one_chunk) {
9897                         /* No more room in rwnd */
9898                         return (1);
9899                 }
9900                 /* stop the for loop here. we sent out a packet */
9901                 break;
9902         }
9903         return (0);
9904 }
9905
9906 static void
9907 sctp_timer_validation(struct sctp_inpcb *inp,
9908     struct sctp_tcb *stcb,
9909     struct sctp_association *asoc)
9910 {
9911         struct sctp_nets *net;
9912
9913         /* Validate that a timer is running somewhere */
9914         TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
9915                 if (SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
9916                         /* Here is a timer */
9917                         return;
9918                 }
9919         }
9920         SCTP_TCB_LOCK_ASSERT(stcb);
9921         /* Gak, we did not have a timer somewhere */
9922         SCTPDBG(SCTP_DEBUG_OUTPUT3, "Deadlock avoided starting timer on a dest at retran\n");
9923         if (asoc->alternate) {
9924                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, asoc->alternate);
9925         } else {
9926                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, asoc->primary_destination);
9927         }
9928         return;
9929 }
9930
9931 void
9932 sctp_chunk_output(struct sctp_inpcb *inp,
9933     struct sctp_tcb *stcb,
9934     int from_where,
9935     int so_locked)
9936 {
9937         /*-
9938          * Ok this is the generic chunk service queue. we must do the
9939          * following:
9940          * - See if there are retransmits pending, if so we must
9941          *   do these first.
9942          * - Service the stream queue that is next, moving any
9943          *   message (note I must get a complete message i.e.
9944          *   FIRST/MIDDLE and LAST to the out queue in one pass) and assigning
9945          *   TSN's
9946          * - Check to see if the cwnd/rwnd allows any output, if so we
9947          *   go ahead and fomulate and send the low level chunks. Making sure
9948          *   to combine any control in the control chunk queue also.
9949          */
9950         struct sctp_association *asoc;
9951         struct sctp_nets *net;
9952         int error = 0, num_out, tot_out = 0, ret = 0, reason_code;
9953         unsigned int burst_cnt = 0;
9954         struct timeval now;
9955         int now_filled = 0;
9956         int nagle_on;
9957         int frag_point = sctp_get_frag_point(stcb, &stcb->asoc);
9958         int un_sent = 0;
9959         int fr_done;
9960         unsigned int tot_frs = 0;
9961
9962         asoc = &stcb->asoc;
9963 do_it_again:
9964         /* The Nagle algorithm is only applied when handling a send call. */
9965         if (from_where == SCTP_OUTPUT_FROM_USR_SEND) {
9966                 if (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_NODELAY)) {
9967                         nagle_on = 0;
9968                 } else {
9969                         nagle_on = 1;
9970                 }
9971         } else {
9972                 nagle_on = 0;
9973         }
9974         SCTP_TCB_LOCK_ASSERT(stcb);
9975
9976         un_sent = (stcb->asoc.total_output_queue_size - stcb->asoc.total_flight);
9977
9978         if ((un_sent <= 0) &&
9979             (TAILQ_EMPTY(&asoc->control_send_queue)) &&
9980             (TAILQ_EMPTY(&asoc->asconf_send_queue)) &&
9981             (asoc->sent_queue_retran_cnt == 0) &&
9982             (asoc->trigger_reset == 0)) {
9983                 /* Nothing to do unless there is something to be sent left */
9984                 return;
9985         }
9986         /*
9987          * Do we have something to send, data or control AND a sack timer
9988          * running, if so piggy-back the sack.
9989          */
9990         if (SCTP_OS_TIMER_PENDING(&stcb->asoc.dack_timer.timer)) {
9991                 sctp_send_sack(stcb, so_locked);
9992                 sctp_timer_stop(SCTP_TIMER_TYPE_RECV, stcb->sctp_ep, stcb, NULL,
9993                     SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_3);
9994         }
9995         while (asoc->sent_queue_retran_cnt) {
9996                 /*-
9997                  * Ok, it is retransmission time only, we send out only ONE
9998                  * packet with a single call off to the retran code.
9999                  */
10000                 if (from_where == SCTP_OUTPUT_FROM_COOKIE_ACK) {
10001                         /*-
10002                          * Special hook for handling cookiess discarded
10003                          * by peer that carried data. Send cookie-ack only
10004                          * and then the next call with get the retran's.
10005                          */
10006                         (void)sctp_med_chunk_output(inp, stcb, asoc, &num_out, &reason_code, 1,
10007                             from_where,
10008                             &now, &now_filled, frag_point, so_locked);
10009                         return;
10010                 } else if (from_where != SCTP_OUTPUT_FROM_HB_TMR) {
10011                         /* if its not from a HB then do it */
10012                         fr_done = 0;
10013                         ret = sctp_chunk_retransmission(inp, stcb, asoc, &num_out, &now, &now_filled, &fr_done, so_locked);
10014                         if (fr_done) {
10015                                 tot_frs++;
10016                         }
10017                 } else {
10018                         /*
10019                          * its from any other place, we don't allow retran
10020                          * output (only control)
10021                          */
10022                         ret = 1;
10023                 }
10024                 if (ret > 0) {
10025                         /* Can't send anymore */
10026                         /*-
10027                          * now lets push out control by calling med-level
10028                          * output once. this assures that we WILL send HB's
10029                          * if queued too.
10030                          */
10031                         (void)sctp_med_chunk_output(inp, stcb, asoc, &num_out, &reason_code, 1,
10032                             from_where,
10033                             &now, &now_filled, frag_point, so_locked);
10034 #ifdef SCTP_AUDITING_ENABLED
10035                         sctp_auditing(8, inp, stcb, NULL);
10036 #endif
10037                         sctp_timer_validation(inp, stcb, asoc);
10038                         return;
10039                 }
10040                 if (ret < 0) {
10041                         /*-
10042                          * The count was off.. retran is not happening so do
10043                          * the normal retransmission.
10044                          */
10045 #ifdef SCTP_AUDITING_ENABLED
10046                         sctp_auditing(9, inp, stcb, NULL);
10047 #endif
10048                         if (ret == SCTP_RETRAN_EXIT) {
10049                                 return;
10050                         }
10051                         break;
10052                 }
10053                 if (from_where == SCTP_OUTPUT_FROM_T3) {
10054                         /* Only one transmission allowed out of a timeout */
10055 #ifdef SCTP_AUDITING_ENABLED
10056                         sctp_auditing(10, inp, stcb, NULL);
10057 #endif
10058                         /* Push out any control */
10059                         (void)sctp_med_chunk_output(inp, stcb, asoc, &num_out, &reason_code, 1, from_where,
10060                             &now, &now_filled, frag_point, so_locked);
10061                         return;
10062                 }
10063                 if ((asoc->fr_max_burst > 0) && (tot_frs >= asoc->fr_max_burst)) {
10064                         /* Hit FR burst limit */
10065                         return;
10066                 }
10067                 if ((num_out == 0) && (ret == 0)) {
10068                         /* No more retrans to send */
10069                         break;
10070                 }
10071         }
10072 #ifdef SCTP_AUDITING_ENABLED
10073         sctp_auditing(12, inp, stcb, NULL);
10074 #endif
10075         /* Check for bad destinations, if they exist move chunks around. */
10076         TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
10077                 if (!(net->dest_state & SCTP_ADDR_REACHABLE)) {
10078                         /*-
10079                          * if possible move things off of this address we
10080                          * still may send below due to the dormant state but
10081                          * we try to find an alternate address to send to
10082                          * and if we have one we move all queued data on the
10083                          * out wheel to this alternate address.
10084                          */
10085                         if (net->ref_count > 1)
10086                                 sctp_move_chunks_from_net(stcb, net);
10087                 } else {
10088                         /*-
10089                          * if ((asoc->sat_network) || (net->addr_is_local))
10090                          * { burst_limit = asoc->max_burst *
10091                          * SCTP_SAT_NETWORK_BURST_INCR; }
10092                          */
10093                         if (asoc->max_burst > 0) {
10094                                 if (SCTP_BASE_SYSCTL(sctp_use_cwnd_based_maxburst)) {
10095                                         if ((net->flight_size + (asoc->max_burst * net->mtu)) < net->cwnd) {
10096                                                 /*
10097                                                  * JRS - Use the congestion
10098                                                  * control given in the
10099                                                  * congestion control module
10100                                                  */
10101                                                 asoc->cc_functions.sctp_cwnd_update_after_output(stcb, net, asoc->max_burst);
10102                                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_MAXBURST_ENABLE) {
10103                                                         sctp_log_maxburst(stcb, net, 0, asoc->max_burst, SCTP_MAX_BURST_APPLIED);
10104                                                 }
10105                                                 SCTP_STAT_INCR(sctps_maxburstqueued);
10106                                         }
10107                                         net->fast_retran_ip = 0;
10108                                 } else {
10109                                         if (net->flight_size == 0) {
10110                                                 /*
10111                                                  * Should be decaying the
10112                                                  * cwnd here
10113                                                  */
10114                                                 ;
10115                                         }
10116                                 }
10117                         }
10118                 }
10119         }
10120         burst_cnt = 0;
10121         do {
10122                 error = sctp_med_chunk_output(inp, stcb, asoc, &num_out,
10123                     &reason_code, 0, from_where,
10124                     &now, &now_filled, frag_point, so_locked);
10125                 if (error) {
10126                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Error %d was returned from med-c-op\n", error);
10127                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_MAXBURST_ENABLE) {
10128                                 sctp_log_maxburst(stcb, asoc->primary_destination, error, burst_cnt, SCTP_MAX_BURST_ERROR_STOP);
10129                         }
10130                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
10131                                 sctp_log_cwnd(stcb, NULL, error, SCTP_SEND_NOW_COMPLETES);
10132                                 sctp_log_cwnd(stcb, NULL, 0xdeadbeef, SCTP_SEND_NOW_COMPLETES);
10133                         }
10134                         break;
10135                 }
10136                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "m-c-o put out %d\n", num_out);
10137
10138                 tot_out += num_out;
10139                 burst_cnt++;
10140                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
10141                         sctp_log_cwnd(stcb, NULL, num_out, SCTP_SEND_NOW_COMPLETES);
10142                         if (num_out == 0) {
10143                                 sctp_log_cwnd(stcb, NULL, reason_code, SCTP_SEND_NOW_COMPLETES);
10144                         }
10145                 }
10146                 if (nagle_on) {
10147                         /*
10148                          * When the Nagle algorithm is used, look at how
10149                          * much is unsent, then if its smaller than an MTU
10150                          * and we have data in flight we stop, except if we
10151                          * are handling a fragmented user message.
10152                          */
10153                         un_sent = stcb->asoc.total_output_queue_size - stcb->asoc.total_flight;
10154                         if ((un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD)) &&
10155                             (stcb->asoc.total_flight > 0)) {
10156 /*      &&                   sctp_is_feature_on(inp, SCTP_PCB_FLAGS_EXPLICIT_EOR))) {*/
10157                                 break;
10158                         }
10159                 }
10160                 if (TAILQ_EMPTY(&asoc->control_send_queue) &&
10161                     TAILQ_EMPTY(&asoc->send_queue) &&
10162                     sctp_is_there_unsent_data(stcb, so_locked) == 0) {
10163                         /* Nothing left to send */
10164                         break;
10165                 }
10166                 if ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) <= 0) {
10167                         /* Nothing left to send */
10168                         break;
10169                 }
10170         } while (num_out &&
10171             ((asoc->max_burst == 0) ||
10172             SCTP_BASE_SYSCTL(sctp_use_cwnd_based_maxburst) ||
10173             (burst_cnt < asoc->max_burst)));
10174
10175         if (SCTP_BASE_SYSCTL(sctp_use_cwnd_based_maxburst) == 0) {
10176                 if ((asoc->max_burst > 0) && (burst_cnt >= asoc->max_burst)) {
10177                         SCTP_STAT_INCR(sctps_maxburstqueued);
10178                         asoc->burst_limit_applied = 1;
10179                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_MAXBURST_ENABLE) {
10180                                 sctp_log_maxburst(stcb, asoc->primary_destination, 0, burst_cnt, SCTP_MAX_BURST_APPLIED);
10181                         }
10182                 } else {
10183                         asoc->burst_limit_applied = 0;
10184                 }
10185         }
10186         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
10187                 sctp_log_cwnd(stcb, NULL, tot_out, SCTP_SEND_NOW_COMPLETES);
10188         }
10189         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Ok, we have put out %d chunks\n",
10190             tot_out);
10191
10192         /*-
10193          * Now we need to clean up the control chunk chain if a ECNE is on
10194          * it. It must be marked as UNSENT again so next call will continue
10195          * to send it until such time that we get a CWR, to remove it.
10196          */
10197         if (stcb->asoc.ecn_echo_cnt_onq)
10198                 sctp_fix_ecn_echo(asoc);
10199
10200         if (stcb->asoc.trigger_reset) {
10201                 if (sctp_send_stream_reset_out_if_possible(stcb, so_locked) == 0) {
10202                         goto do_it_again;
10203                 }
10204         }
10205         return;
10206 }
10207
10208 int
10209 sctp_output(
10210     struct sctp_inpcb *inp,
10211     struct mbuf *m,
10212     struct sockaddr *addr,
10213     struct mbuf *control,
10214     struct thread *p,
10215     int flags)
10216 {
10217         if (inp == NULL) {
10218                 SCTP_LTRACE_ERR_RET_PKT(m, inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
10219                 return (EINVAL);
10220         }
10221
10222         if (inp->sctp_socket == NULL) {
10223                 SCTP_LTRACE_ERR_RET_PKT(m, inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
10224                 return (EINVAL);
10225         }
10226         return (sctp_sosend(inp->sctp_socket,
10227             addr,
10228             (struct uio *)NULL,
10229             m,
10230             control,
10231             flags, p
10232             ));
10233 }
10234
10235 void
10236 send_forward_tsn(struct sctp_tcb *stcb,
10237     struct sctp_association *asoc)
10238 {
10239         struct sctp_tmit_chunk *chk, *at, *tp1, *last;
10240         struct sctp_forward_tsn_chunk *fwdtsn;
10241         struct sctp_strseq *strseq;
10242         struct sctp_strseq_mid *strseq_m;
10243         uint32_t advance_peer_ack_point;
10244         unsigned int cnt_of_space, i, ovh;
10245         unsigned int space_needed;
10246         unsigned int cnt_of_skipped = 0;
10247
10248         SCTP_TCB_LOCK_ASSERT(stcb);
10249         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
10250                 if (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN) {
10251                         /* mark it to unsent */
10252                         chk->sent = SCTP_DATAGRAM_UNSENT;
10253                         chk->snd_count = 0;
10254                         /* Do we correct its output location? */
10255                         if (chk->whoTo) {
10256                                 sctp_free_remote_addr(chk->whoTo);
10257                                 chk->whoTo = NULL;
10258                         }
10259                         goto sctp_fill_in_rest;
10260                 }
10261         }
10262         /* Ok if we reach here we must build one */
10263         sctp_alloc_a_chunk(stcb, chk);
10264         if (chk == NULL) {
10265                 return;
10266         }
10267         asoc->fwd_tsn_cnt++;
10268         chk->copy_by_ref = 0;
10269         /*
10270          * We don't do the old thing here since this is used not for on-wire
10271          * but to tell if we are sending a fwd-tsn by the stack during
10272          * output. And if its a IFORWARD or a FORWARD it is a fwd-tsn.
10273          */
10274         chk->rec.chunk_id.id = SCTP_FORWARD_CUM_TSN;
10275         chk->rec.chunk_id.can_take_data = 0;
10276         chk->flags = 0;
10277         chk->asoc = asoc;
10278         chk->whoTo = NULL;
10279         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
10280         if (chk->data == NULL) {
10281                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
10282                 return;
10283         }
10284         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
10285         chk->sent = SCTP_DATAGRAM_UNSENT;
10286         chk->snd_count = 0;
10287         TAILQ_INSERT_TAIL(&asoc->control_send_queue, chk, sctp_next);
10288         asoc->ctrl_queue_cnt++;
10289 sctp_fill_in_rest:
10290         /*-
10291          * Here we go through and fill out the part that deals with
10292          * stream/seq of the ones we skip.
10293          */
10294         SCTP_BUF_LEN(chk->data) = 0;
10295         TAILQ_FOREACH(at, &asoc->sent_queue, sctp_next) {
10296                 if ((at->sent != SCTP_FORWARD_TSN_SKIP) &&
10297                     (at->sent != SCTP_DATAGRAM_NR_ACKED)) {
10298                         /* no more to look at */
10299                         break;
10300                 }
10301                 if (!asoc->idata_supported && (at->rec.data.rcv_flags & SCTP_DATA_UNORDERED)) {
10302                         /* We don't report these */
10303                         continue;
10304                 }
10305                 cnt_of_skipped++;
10306         }
10307         if (asoc->idata_supported) {
10308                 space_needed = (sizeof(struct sctp_forward_tsn_chunk) +
10309                     (cnt_of_skipped * sizeof(struct sctp_strseq_mid)));
10310         } else {
10311                 space_needed = (sizeof(struct sctp_forward_tsn_chunk) +
10312                     (cnt_of_skipped * sizeof(struct sctp_strseq)));
10313         }
10314         cnt_of_space = (unsigned int)M_TRAILINGSPACE(chk->data);
10315
10316         if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
10317                 ovh = SCTP_MIN_OVERHEAD;
10318         } else {
10319                 ovh = SCTP_MIN_V4_OVERHEAD;
10320         }
10321         if (cnt_of_space > (asoc->smallest_mtu - ovh)) {
10322                 /* trim to a mtu size */
10323                 cnt_of_space = asoc->smallest_mtu - ovh;
10324         }
10325         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_TRY_ADVANCE) {
10326                 sctp_misc_ints(SCTP_FWD_TSN_CHECK,
10327                     0xff, 0, cnt_of_skipped,
10328                     asoc->advanced_peer_ack_point);
10329         }
10330         advance_peer_ack_point = asoc->advanced_peer_ack_point;
10331         if (cnt_of_space < space_needed) {
10332                 /*-
10333                  * ok we must trim down the chunk by lowering the
10334                  * advance peer ack point.
10335                  */
10336                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_TRY_ADVANCE) {
10337                         sctp_misc_ints(SCTP_FWD_TSN_CHECK,
10338                             0xff, 0xff, cnt_of_space,
10339                             space_needed);
10340                 }
10341                 cnt_of_skipped = cnt_of_space - sizeof(struct sctp_forward_tsn_chunk);
10342                 if (asoc->idata_supported) {
10343                         cnt_of_skipped /= sizeof(struct sctp_strseq_mid);
10344                 } else {
10345                         cnt_of_skipped /= sizeof(struct sctp_strseq);
10346                 }
10347                 /*-
10348                  * Go through and find the TSN that will be the one
10349                  * we report.
10350                  */
10351                 at = TAILQ_FIRST(&asoc->sent_queue);
10352                 if (at != NULL) {
10353                         for (i = 0; i < cnt_of_skipped; i++) {
10354                                 tp1 = TAILQ_NEXT(at, sctp_next);
10355                                 if (tp1 == NULL) {
10356                                         break;
10357                                 }
10358                                 at = tp1;
10359                         }
10360                 }
10361                 if (at && SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_TRY_ADVANCE) {
10362                         sctp_misc_ints(SCTP_FWD_TSN_CHECK,
10363                             0xff, cnt_of_skipped, at->rec.data.tsn,
10364                             asoc->advanced_peer_ack_point);
10365                 }
10366                 last = at;
10367                 /*-
10368                  * last now points to last one I can report, update
10369                  * peer ack point
10370                  */
10371                 if (last) {
10372                         advance_peer_ack_point = last->rec.data.tsn;
10373                 }
10374                 if (asoc->idata_supported) {
10375                         space_needed = sizeof(struct sctp_forward_tsn_chunk) +
10376                             cnt_of_skipped * sizeof(struct sctp_strseq_mid);
10377                 } else {
10378                         space_needed = sizeof(struct sctp_forward_tsn_chunk) +
10379                             cnt_of_skipped * sizeof(struct sctp_strseq);
10380                 }
10381         }
10382         chk->send_size = space_needed;
10383         /* Setup the chunk */
10384         fwdtsn = mtod(chk->data, struct sctp_forward_tsn_chunk *);
10385         fwdtsn->ch.chunk_length = htons(chk->send_size);
10386         fwdtsn->ch.chunk_flags = 0;
10387         if (asoc->idata_supported) {
10388                 fwdtsn->ch.chunk_type = SCTP_IFORWARD_CUM_TSN;
10389         } else {
10390                 fwdtsn->ch.chunk_type = SCTP_FORWARD_CUM_TSN;
10391         }
10392         fwdtsn->new_cumulative_tsn = htonl(advance_peer_ack_point);
10393         SCTP_BUF_LEN(chk->data) = chk->send_size;
10394         fwdtsn++;
10395         /*-
10396          * Move pointer to after the fwdtsn and transfer to the
10397          * strseq pointer.
10398          */
10399         if (asoc->idata_supported) {
10400                 strseq_m = (struct sctp_strseq_mid *)fwdtsn;
10401                 strseq = NULL;
10402         } else {
10403                 strseq = (struct sctp_strseq *)fwdtsn;
10404                 strseq_m = NULL;
10405         }
10406         /*-
10407          * Now populate the strseq list. This is done blindly
10408          * without pulling out duplicate stream info. This is
10409          * inefficent but won't harm the process since the peer will
10410          * look at these in sequence and will thus release anything.
10411          * It could mean we exceed the PMTU and chop off some that
10412          * we could have included.. but this is unlikely (aka 1432/4
10413          * would mean 300+ stream seq's would have to be reported in
10414          * one FWD-TSN. With a bit of work we can later FIX this to
10415          * optimize and pull out duplicates.. but it does add more
10416          * overhead. So for now... not!
10417          */
10418         i = 0;
10419         TAILQ_FOREACH(at, &asoc->sent_queue, sctp_next) {
10420                 if (i >= cnt_of_skipped) {
10421                         break;
10422                 }
10423                 if (!asoc->idata_supported && (at->rec.data.rcv_flags & SCTP_DATA_UNORDERED)) {
10424                         /* We don't report these */
10425                         continue;
10426                 }
10427                 if (at->rec.data.tsn == advance_peer_ack_point) {
10428                         at->rec.data.fwd_tsn_cnt = 0;
10429                 }
10430                 if (asoc->idata_supported) {
10431                         strseq_m->sid = htons(at->rec.data.sid);
10432                         if (at->rec.data.rcv_flags & SCTP_DATA_UNORDERED) {
10433                                 strseq_m->flags = htons(PR_SCTP_UNORDERED_FLAG);
10434                         } else {
10435                                 strseq_m->flags = 0;
10436                         }
10437                         strseq_m->mid = htonl(at->rec.data.mid);
10438                         strseq_m++;
10439                 } else {
10440                         strseq->sid = htons(at->rec.data.sid);
10441                         strseq->ssn = htons((uint16_t)at->rec.data.mid);
10442                         strseq++;
10443                 }
10444                 i++;
10445         }
10446         return;
10447 }
10448
10449 void
10450 sctp_send_sack(struct sctp_tcb *stcb, int so_locked)
10451 {
10452         /*-
10453          * Queue up a SACK or NR-SACK in the control queue.
10454          * We must first check to see if a SACK or NR-SACK is
10455          * somehow on the control queue.
10456          * If so, we will take and and remove the old one.
10457          */
10458         struct sctp_association *asoc;
10459         struct sctp_tmit_chunk *chk, *a_chk;
10460         struct sctp_sack_chunk *sack;
10461         struct sctp_nr_sack_chunk *nr_sack;
10462         struct sctp_gap_ack_block *gap_descriptor;
10463         const struct sack_track *selector;
10464         int mergeable = 0;
10465         int offset;
10466         caddr_t limit;
10467         uint32_t *dup;
10468         int limit_reached = 0;
10469         unsigned int i, siz, j;
10470         unsigned int num_gap_blocks = 0, num_nr_gap_blocks = 0, space;
10471         int num_dups = 0;
10472         int space_req;
10473         uint32_t highest_tsn;
10474         uint8_t flags;
10475         uint8_t type;
10476         uint8_t tsn_map;
10477
10478         if (stcb->asoc.nrsack_supported == 1) {
10479                 type = SCTP_NR_SELECTIVE_ACK;
10480         } else {
10481                 type = SCTP_SELECTIVE_ACK;
10482         }
10483         a_chk = NULL;
10484         asoc = &stcb->asoc;
10485         SCTP_TCB_LOCK_ASSERT(stcb);
10486         if (asoc->last_data_chunk_from == NULL) {
10487                 /* Hmm we never received anything */
10488                 return;
10489         }
10490         sctp_slide_mapping_arrays(stcb);
10491         sctp_set_rwnd(stcb, asoc);
10492         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
10493                 if (chk->rec.chunk_id.id == type) {
10494                         /* Hmm, found a sack already on queue, remove it */
10495                         TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
10496                         asoc->ctrl_queue_cnt--;
10497                         a_chk = chk;
10498                         if (a_chk->data) {
10499                                 sctp_m_freem(a_chk->data);
10500                                 a_chk->data = NULL;
10501                         }
10502                         if (a_chk->whoTo) {
10503                                 sctp_free_remote_addr(a_chk->whoTo);
10504                                 a_chk->whoTo = NULL;
10505                         }
10506                         break;
10507                 }
10508         }
10509         if (a_chk == NULL) {
10510                 sctp_alloc_a_chunk(stcb, a_chk);
10511                 if (a_chk == NULL) {
10512                         /* No memory so we drop the idea, and set a timer */
10513                         if (stcb->asoc.delayed_ack) {
10514                                 sctp_timer_stop(SCTP_TIMER_TYPE_RECV,
10515                                     stcb->sctp_ep, stcb, NULL,
10516                                     SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_4);
10517                                 sctp_timer_start(SCTP_TIMER_TYPE_RECV,
10518                                     stcb->sctp_ep, stcb, NULL);
10519                         } else {
10520                                 stcb->asoc.send_sack = 1;
10521                         }
10522                         return;
10523                 }
10524                 a_chk->copy_by_ref = 0;
10525                 a_chk->rec.chunk_id.id = type;
10526                 a_chk->rec.chunk_id.can_take_data = 1;
10527         }
10528         /* Clear our pkt counts */
10529         asoc->data_pkts_seen = 0;
10530
10531         a_chk->flags = 0;
10532         a_chk->asoc = asoc;
10533         a_chk->snd_count = 0;
10534         a_chk->send_size = 0;   /* fill in later */
10535         a_chk->sent = SCTP_DATAGRAM_UNSENT;
10536         a_chk->whoTo = NULL;
10537
10538         if (!(asoc->last_data_chunk_from->dest_state & SCTP_ADDR_REACHABLE)) {
10539                 /*-
10540                  * Ok, the destination for the SACK is unreachable, lets see if
10541                  * we can select an alternate to asoc->last_data_chunk_from
10542                  */
10543                 a_chk->whoTo = sctp_find_alternate_net(stcb, asoc->last_data_chunk_from, 0);
10544                 if (a_chk->whoTo == NULL) {
10545                         /* Nope, no alternate */
10546                         a_chk->whoTo = asoc->last_data_chunk_from;
10547                 }
10548         } else {
10549                 a_chk->whoTo = asoc->last_data_chunk_from;
10550         }
10551         if (a_chk->whoTo) {
10552                 atomic_add_int(&a_chk->whoTo->ref_count, 1);
10553         }
10554         if (SCTP_TSN_GT(asoc->highest_tsn_inside_map, asoc->highest_tsn_inside_nr_map)) {
10555                 highest_tsn = asoc->highest_tsn_inside_map;
10556         } else {
10557                 highest_tsn = asoc->highest_tsn_inside_nr_map;
10558         }
10559         if (highest_tsn == asoc->cumulative_tsn) {
10560                 /* no gaps */
10561                 if (type == SCTP_SELECTIVE_ACK) {
10562                         space_req = sizeof(struct sctp_sack_chunk);
10563                 } else {
10564                         space_req = sizeof(struct sctp_nr_sack_chunk);
10565                 }
10566         } else {
10567                 /* gaps get a cluster */
10568                 space_req = MCLBYTES;
10569         }
10570         /* Ok now lets formulate a MBUF with our sack */
10571         a_chk->data = sctp_get_mbuf_for_msg(space_req, 0, M_NOWAIT, 1, MT_DATA);
10572         if ((a_chk->data == NULL) ||
10573             (a_chk->whoTo == NULL)) {
10574                 /* rats, no mbuf memory */
10575                 if (a_chk->data) {
10576                         /* was a problem with the destination */
10577                         sctp_m_freem(a_chk->data);
10578                         a_chk->data = NULL;
10579                 }
10580                 sctp_free_a_chunk(stcb, a_chk, so_locked);
10581                 /* sa_ignore NO_NULL_CHK */
10582                 if (stcb->asoc.delayed_ack) {
10583                         sctp_timer_stop(SCTP_TIMER_TYPE_RECV,
10584                             stcb->sctp_ep, stcb, NULL,
10585                             SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_5);
10586                         sctp_timer_start(SCTP_TIMER_TYPE_RECV,
10587                             stcb->sctp_ep, stcb, NULL);
10588                 } else {
10589                         stcb->asoc.send_sack = 1;
10590                 }
10591                 return;
10592         }
10593         /* ok, lets go through and fill it in */
10594         SCTP_BUF_RESV_UF(a_chk->data, SCTP_MIN_OVERHEAD);
10595         space = (unsigned int)M_TRAILINGSPACE(a_chk->data);
10596         if (space > (a_chk->whoTo->mtu - SCTP_MIN_OVERHEAD)) {
10597                 space = (a_chk->whoTo->mtu - SCTP_MIN_OVERHEAD);
10598         }
10599         limit = mtod(a_chk->data, caddr_t);
10600         limit += space;
10601
10602         flags = 0;
10603
10604         if ((asoc->sctp_cmt_on_off > 0) &&
10605             SCTP_BASE_SYSCTL(sctp_cmt_use_dac)) {
10606                 /*-
10607                  * CMT DAC algorithm: If 2 (i.e., 0x10) packets have been
10608                  * received, then set high bit to 1, else 0. Reset
10609                  * pkts_rcvd.
10610                  */
10611                 flags |= (asoc->cmt_dac_pkts_rcvd << 6);
10612                 asoc->cmt_dac_pkts_rcvd = 0;
10613         }
10614 #ifdef SCTP_ASOCLOG_OF_TSNS
10615         stcb->asoc.cumack_logsnt[stcb->asoc.cumack_log_atsnt] = asoc->cumulative_tsn;
10616         stcb->asoc.cumack_log_atsnt++;
10617         if (stcb->asoc.cumack_log_atsnt >= SCTP_TSN_LOG_SIZE) {
10618                 stcb->asoc.cumack_log_atsnt = 0;
10619         }
10620 #endif
10621         /* reset the readers interpretation */
10622         stcb->freed_by_sorcv_sincelast = 0;
10623
10624         if (type == SCTP_SELECTIVE_ACK) {
10625                 sack = mtod(a_chk->data, struct sctp_sack_chunk *);
10626                 nr_sack = NULL;
10627                 gap_descriptor = (struct sctp_gap_ack_block *)((caddr_t)sack + sizeof(struct sctp_sack_chunk));
10628                 if (highest_tsn > asoc->mapping_array_base_tsn) {
10629                         siz = (((highest_tsn - asoc->mapping_array_base_tsn) + 1) + 7) / 8;
10630                 } else {
10631                         siz = (((MAX_TSN - asoc->mapping_array_base_tsn) + 1) + highest_tsn + 7) / 8;
10632                 }
10633         } else {
10634                 sack = NULL;
10635                 nr_sack = mtod(a_chk->data, struct sctp_nr_sack_chunk *);
10636                 gap_descriptor = (struct sctp_gap_ack_block *)((caddr_t)nr_sack + sizeof(struct sctp_nr_sack_chunk));
10637                 if (asoc->highest_tsn_inside_map > asoc->mapping_array_base_tsn) {
10638                         siz = (((asoc->highest_tsn_inside_map - asoc->mapping_array_base_tsn) + 1) + 7) / 8;
10639                 } else {
10640                         siz = (((MAX_TSN - asoc->mapping_array_base_tsn) + 1) + asoc->highest_tsn_inside_map + 7) / 8;
10641                 }
10642         }
10643
10644         if (SCTP_TSN_GT(asoc->mapping_array_base_tsn, asoc->cumulative_tsn)) {
10645                 offset = 1;
10646         } else {
10647                 offset = asoc->mapping_array_base_tsn - asoc->cumulative_tsn;
10648         }
10649         if (((type == SCTP_SELECTIVE_ACK) &&
10650             SCTP_TSN_GT(highest_tsn, asoc->cumulative_tsn)) ||
10651             ((type == SCTP_NR_SELECTIVE_ACK) &&
10652             SCTP_TSN_GT(asoc->highest_tsn_inside_map, asoc->cumulative_tsn))) {
10653                 /* we have a gap .. maybe */
10654                 for (i = 0; i < siz; i++) {
10655                         tsn_map = asoc->mapping_array[i];
10656                         if (type == SCTP_SELECTIVE_ACK) {
10657                                 tsn_map |= asoc->nr_mapping_array[i];
10658                         }
10659                         if (i == 0) {
10660                                 /*
10661                                  * Clear all bits corresponding to TSNs
10662                                  * smaller or equal to the cumulative TSN.
10663                                  */
10664                                 tsn_map &= (~0U << (1 - offset));
10665                         }
10666                         selector = &sack_array[tsn_map];
10667                         if (mergeable && selector->right_edge) {
10668                                 /*
10669                                  * Backup, left and right edges were ok to
10670                                  * merge.
10671                                  */
10672                                 num_gap_blocks--;
10673                                 gap_descriptor--;
10674                         }
10675                         if (selector->num_entries == 0)
10676                                 mergeable = 0;
10677                         else {
10678                                 for (j = 0; j < selector->num_entries; j++) {
10679                                         if (mergeable && selector->right_edge) {
10680                                                 /*
10681                                                  * do a merge by NOT setting
10682                                                  * the left side
10683                                                  */
10684                                                 mergeable = 0;
10685                                         } else {
10686                                                 /*
10687                                                  * no merge, set the left
10688                                                  * side
10689                                                  */
10690                                                 mergeable = 0;
10691                                                 gap_descriptor->start = htons((selector->gaps[j].start + offset));
10692                                         }
10693                                         gap_descriptor->end = htons((selector->gaps[j].end + offset));
10694                                         num_gap_blocks++;
10695                                         gap_descriptor++;
10696                                         if (((caddr_t)gap_descriptor + sizeof(struct sctp_gap_ack_block)) > limit) {
10697                                                 /* no more room */
10698                                                 limit_reached = 1;
10699                                                 break;
10700                                         }
10701                                 }
10702                                 if (selector->left_edge) {
10703                                         mergeable = 1;
10704                                 }
10705                         }
10706                         if (limit_reached) {
10707                                 /* Reached the limit stop */
10708                                 break;
10709                         }
10710                         offset += 8;
10711                 }
10712         }
10713         if ((type == SCTP_NR_SELECTIVE_ACK) &&
10714             (limit_reached == 0)) {
10715                 mergeable = 0;
10716
10717                 if (asoc->highest_tsn_inside_nr_map > asoc->mapping_array_base_tsn) {
10718                         siz = (((asoc->highest_tsn_inside_nr_map - asoc->mapping_array_base_tsn) + 1) + 7) / 8;
10719                 } else {
10720                         siz = (((MAX_TSN - asoc->mapping_array_base_tsn) + 1) + asoc->highest_tsn_inside_nr_map + 7) / 8;
10721                 }
10722
10723                 if (SCTP_TSN_GT(asoc->mapping_array_base_tsn, asoc->cumulative_tsn)) {
10724                         offset = 1;
10725                 } else {
10726                         offset = asoc->mapping_array_base_tsn - asoc->cumulative_tsn;
10727                 }
10728                 if (SCTP_TSN_GT(asoc->highest_tsn_inside_nr_map, asoc->cumulative_tsn)) {
10729                         /* we have a gap .. maybe */
10730                         for (i = 0; i < siz; i++) {
10731                                 tsn_map = asoc->nr_mapping_array[i];
10732                                 if (i == 0) {
10733                                         /*
10734                                          * Clear all bits corresponding to
10735                                          * TSNs smaller or equal to the
10736                                          * cumulative TSN.
10737                                          */
10738                                         tsn_map &= (~0U << (1 - offset));
10739                                 }
10740                                 selector = &sack_array[tsn_map];
10741                                 if (mergeable && selector->right_edge) {
10742                                         /*
10743                                          * Backup, left and right edges were
10744                                          * ok to merge.
10745                                          */
10746                                         num_nr_gap_blocks--;
10747                                         gap_descriptor--;
10748                                 }
10749                                 if (selector->num_entries == 0)
10750                                         mergeable = 0;
10751                                 else {
10752                                         for (j = 0; j < selector->num_entries; j++) {
10753                                                 if (mergeable && selector->right_edge) {
10754                                                         /*
10755                                                          * do a merge by NOT
10756                                                          * setting the left
10757                                                          * side
10758                                                          */
10759                                                         mergeable = 0;
10760                                                 } else {
10761                                                         /*
10762                                                          * no merge, set the
10763                                                          * left side
10764                                                          */
10765                                                         mergeable = 0;
10766                                                         gap_descriptor->start = htons((selector->gaps[j].start + offset));
10767                                                 }
10768                                                 gap_descriptor->end = htons((selector->gaps[j].end + offset));
10769                                                 num_nr_gap_blocks++;
10770                                                 gap_descriptor++;
10771                                                 if (((caddr_t)gap_descriptor + sizeof(struct sctp_gap_ack_block)) > limit) {
10772                                                         /* no more room */
10773                                                         limit_reached = 1;
10774                                                         break;
10775                                                 }
10776                                         }
10777                                         if (selector->left_edge) {
10778                                                 mergeable = 1;
10779                                         }
10780                                 }
10781                                 if (limit_reached) {
10782                                         /* Reached the limit stop */
10783                                         break;
10784                                 }
10785                                 offset += 8;
10786                         }
10787                 }
10788         }
10789         /* now we must add any dups we are going to report. */
10790         if ((limit_reached == 0) && (asoc->numduptsns)) {
10791                 dup = (uint32_t *)gap_descriptor;
10792                 for (i = 0; i < asoc->numduptsns; i++) {
10793                         *dup = htonl(asoc->dup_tsns[i]);
10794                         dup++;
10795                         num_dups++;
10796                         if (((caddr_t)dup + sizeof(uint32_t)) > limit) {
10797                                 /* no more room */
10798                                 break;
10799                         }
10800                 }
10801                 asoc->numduptsns = 0;
10802         }
10803         /*
10804          * now that the chunk is prepared queue it to the control chunk
10805          * queue.
10806          */
10807         if (type == SCTP_SELECTIVE_ACK) {
10808                 a_chk->send_size = (uint16_t)(sizeof(struct sctp_sack_chunk) +
10809                     (num_gap_blocks + num_nr_gap_blocks) * sizeof(struct sctp_gap_ack_block) +
10810                     num_dups * sizeof(int32_t));
10811                 SCTP_BUF_LEN(a_chk->data) = a_chk->send_size;
10812                 sack->sack.cum_tsn_ack = htonl(asoc->cumulative_tsn);
10813                 sack->sack.a_rwnd = htonl(asoc->my_rwnd);
10814                 sack->sack.num_gap_ack_blks = htons(num_gap_blocks);
10815                 sack->sack.num_dup_tsns = htons(num_dups);
10816                 sack->ch.chunk_type = type;
10817                 sack->ch.chunk_flags = flags;
10818                 sack->ch.chunk_length = htons(a_chk->send_size);
10819         } else {
10820                 a_chk->send_size = (uint16_t)(sizeof(struct sctp_nr_sack_chunk) +
10821                     (num_gap_blocks + num_nr_gap_blocks) * sizeof(struct sctp_gap_ack_block) +
10822                     num_dups * sizeof(int32_t));
10823                 SCTP_BUF_LEN(a_chk->data) = a_chk->send_size;
10824                 nr_sack->nr_sack.cum_tsn_ack = htonl(asoc->cumulative_tsn);
10825                 nr_sack->nr_sack.a_rwnd = htonl(asoc->my_rwnd);
10826                 nr_sack->nr_sack.num_gap_ack_blks = htons(num_gap_blocks);
10827                 nr_sack->nr_sack.num_nr_gap_ack_blks = htons(num_nr_gap_blocks);
10828                 nr_sack->nr_sack.num_dup_tsns = htons(num_dups);
10829                 nr_sack->nr_sack.reserved = 0;
10830                 nr_sack->ch.chunk_type = type;
10831                 nr_sack->ch.chunk_flags = flags;
10832                 nr_sack->ch.chunk_length = htons(a_chk->send_size);
10833         }
10834         TAILQ_INSERT_TAIL(&asoc->control_send_queue, a_chk, sctp_next);
10835         asoc->my_last_reported_rwnd = asoc->my_rwnd;
10836         asoc->ctrl_queue_cnt++;
10837         asoc->send_sack = 0;
10838         SCTP_STAT_INCR(sctps_sendsacks);
10839         return;
10840 }
10841
10842 void
10843 sctp_send_abort_tcb(struct sctp_tcb *stcb, struct mbuf *operr, int so_locked)
10844 {
10845         struct mbuf *m_abort, *m, *m_last;
10846         struct mbuf *m_out, *m_end = NULL;
10847         struct sctp_abort_chunk *abort;
10848         struct sctp_auth_chunk *auth = NULL;
10849         struct sctp_nets *net;
10850         uint32_t vtag;
10851         uint32_t auth_offset = 0;
10852         int error;
10853         uint16_t cause_len, chunk_len, padding_len;
10854
10855         SCTP_TCB_LOCK_ASSERT(stcb);
10856         /*-
10857          * Add an AUTH chunk, if chunk requires it and save the offset into
10858          * the chain for AUTH
10859          */
10860         if (sctp_auth_is_required_chunk(SCTP_ABORT_ASSOCIATION,
10861             stcb->asoc.peer_auth_chunks)) {
10862                 m_out = sctp_add_auth_chunk(NULL, &m_end, &auth, &auth_offset,
10863                     stcb, SCTP_ABORT_ASSOCIATION);
10864                 SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
10865         } else {
10866                 m_out = NULL;
10867         }
10868         m_abort = sctp_get_mbuf_for_msg(sizeof(struct sctp_abort_chunk), 0, M_NOWAIT, 1, MT_HEADER);
10869         if (m_abort == NULL) {
10870                 if (m_out) {
10871                         sctp_m_freem(m_out);
10872                 }
10873                 if (operr) {
10874                         sctp_m_freem(operr);
10875                 }
10876                 return;
10877         }
10878         /* link in any error */
10879         SCTP_BUF_NEXT(m_abort) = operr;
10880         cause_len = 0;
10881         m_last = NULL;
10882         for (m = operr; m; m = SCTP_BUF_NEXT(m)) {
10883                 cause_len += (uint16_t)SCTP_BUF_LEN(m);
10884                 if (SCTP_BUF_NEXT(m) == NULL) {
10885                         m_last = m;
10886                 }
10887         }
10888         SCTP_BUF_LEN(m_abort) = sizeof(struct sctp_abort_chunk);
10889         chunk_len = (uint16_t)sizeof(struct sctp_abort_chunk) + cause_len;
10890         padding_len = SCTP_SIZE32(chunk_len) - chunk_len;
10891         if (m_out == NULL) {
10892                 /* NO Auth chunk prepended, so reserve space in front */
10893                 SCTP_BUF_RESV_UF(m_abort, SCTP_MIN_OVERHEAD);
10894                 m_out = m_abort;
10895         } else {
10896                 /* Put AUTH chunk at the front of the chain */
10897                 SCTP_BUF_NEXT(m_end) = m_abort;
10898         }
10899         if (stcb->asoc.alternate) {
10900                 net = stcb->asoc.alternate;
10901         } else {
10902                 net = stcb->asoc.primary_destination;
10903         }
10904         /* Fill in the ABORT chunk header. */
10905         abort = mtod(m_abort, struct sctp_abort_chunk *);
10906         abort->ch.chunk_type = SCTP_ABORT_ASSOCIATION;
10907         if (stcb->asoc.peer_vtag == 0) {
10908                 /* This happens iff the assoc is in COOKIE-WAIT state. */
10909                 vtag = stcb->asoc.my_vtag;
10910                 abort->ch.chunk_flags = SCTP_HAD_NO_TCB;
10911         } else {
10912                 vtag = stcb->asoc.peer_vtag;
10913                 abort->ch.chunk_flags = 0;
10914         }
10915         abort->ch.chunk_length = htons(chunk_len);
10916         /* Add padding, if necessary. */
10917         if (padding_len > 0) {
10918                 if ((m_last == NULL) ||
10919                     (sctp_add_pad_tombuf(m_last, padding_len) == NULL)) {
10920                         sctp_m_freem(m_out);
10921                         return;
10922                 }
10923         }
10924         if ((error = sctp_lowlevel_chunk_output(stcb->sctp_ep, stcb, net,
10925             (struct sockaddr *)&net->ro._l_addr,
10926             m_out, auth_offset, auth, stcb->asoc.authinfo.active_keyid, 1, 0, 0,
10927             stcb->sctp_ep->sctp_lport, stcb->rport, htonl(vtag),
10928             stcb->asoc.primary_destination->port, NULL,
10929             0, 0,
10930             so_locked))) {
10931                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
10932                 if (error == ENOBUFS) {
10933                         stcb->asoc.ifp_had_enobuf = 1;
10934                         SCTP_STAT_INCR(sctps_lowlevelerr);
10935                 }
10936         } else {
10937                 stcb->asoc.ifp_had_enobuf = 0;
10938         }
10939         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
10940 }
10941
10942 void
10943 sctp_send_shutdown_complete(struct sctp_tcb *stcb,
10944     struct sctp_nets *net,
10945     int reflect_vtag)
10946 {
10947         /* formulate and SEND a SHUTDOWN-COMPLETE */
10948         struct mbuf *m_shutdown_comp;
10949         struct sctp_shutdown_complete_chunk *shutdown_complete;
10950         uint32_t vtag;
10951         int error;
10952         uint8_t flags;
10953
10954         m_shutdown_comp = sctp_get_mbuf_for_msg(sizeof(struct sctp_chunkhdr), 0, M_NOWAIT, 1, MT_HEADER);
10955         if (m_shutdown_comp == NULL) {
10956                 /* no mbuf's */
10957                 return;
10958         }
10959         if (reflect_vtag) {
10960                 flags = SCTP_HAD_NO_TCB;
10961                 vtag = stcb->asoc.my_vtag;
10962         } else {
10963                 flags = 0;
10964                 vtag = stcb->asoc.peer_vtag;
10965         }
10966         shutdown_complete = mtod(m_shutdown_comp, struct sctp_shutdown_complete_chunk *);
10967         shutdown_complete->ch.chunk_type = SCTP_SHUTDOWN_COMPLETE;
10968         shutdown_complete->ch.chunk_flags = flags;
10969         shutdown_complete->ch.chunk_length = htons(sizeof(struct sctp_shutdown_complete_chunk));
10970         SCTP_BUF_LEN(m_shutdown_comp) = sizeof(struct sctp_shutdown_complete_chunk);
10971         if ((error = sctp_lowlevel_chunk_output(stcb->sctp_ep, stcb, net,
10972             (struct sockaddr *)&net->ro._l_addr,
10973             m_shutdown_comp, 0, NULL, 0, 1, 0, 0,
10974             stcb->sctp_ep->sctp_lport, stcb->rport,
10975             htonl(vtag),
10976             net->port, NULL,
10977             0, 0,
10978             SCTP_SO_NOT_LOCKED))) {
10979                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
10980                 if (error == ENOBUFS) {
10981                         stcb->asoc.ifp_had_enobuf = 1;
10982                         SCTP_STAT_INCR(sctps_lowlevelerr);
10983                 }
10984         } else {
10985                 stcb->asoc.ifp_had_enobuf = 0;
10986         }
10987         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
10988         return;
10989 }
10990
10991 static void
10992 sctp_send_resp_msg(struct sockaddr *src, struct sockaddr *dst,
10993     struct sctphdr *sh, uint32_t vtag,
10994     uint8_t type, struct mbuf *cause,
10995     uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum,
10996     uint32_t vrf_id, uint16_t port)
10997 {
10998         struct mbuf *o_pak;
10999         struct mbuf *mout;
11000         struct sctphdr *shout;
11001         struct sctp_chunkhdr *ch;
11002 #if defined(INET) || defined(INET6)
11003         struct udphdr *udp;
11004 #endif
11005         int ret, len, cause_len, padding_len;
11006 #ifdef INET
11007         struct sockaddr_in *src_sin, *dst_sin;
11008         struct ip *ip;
11009 #endif
11010 #ifdef INET6
11011         struct sockaddr_in6 *src_sin6, *dst_sin6;
11012         struct ip6_hdr *ip6;
11013 #endif
11014
11015         /* Compute the length of the cause and add final padding. */
11016         cause_len = 0;
11017         if (cause != NULL) {
11018                 struct mbuf *m_at, *m_last = NULL;
11019
11020                 for (m_at = cause; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
11021                         if (SCTP_BUF_NEXT(m_at) == NULL)
11022                                 m_last = m_at;
11023                         cause_len += SCTP_BUF_LEN(m_at);
11024                 }
11025                 padding_len = cause_len % 4;
11026                 if (padding_len != 0) {
11027                         padding_len = 4 - padding_len;
11028                 }
11029                 if (padding_len != 0) {
11030                         if (sctp_add_pad_tombuf(m_last, padding_len) == NULL) {
11031                                 sctp_m_freem(cause);
11032                                 return;
11033                         }
11034                 }
11035         } else {
11036                 padding_len = 0;
11037         }
11038         /* Get an mbuf for the header. */
11039         len = sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
11040         switch (dst->sa_family) {
11041 #ifdef INET
11042         case AF_INET:
11043                 len += sizeof(struct ip);
11044                 break;
11045 #endif
11046 #ifdef INET6
11047         case AF_INET6:
11048                 len += sizeof(struct ip6_hdr);
11049                 break;
11050 #endif
11051         default:
11052                 break;
11053         }
11054 #if defined(INET) || defined(INET6)
11055         if (port) {
11056                 len += sizeof(struct udphdr);
11057         }
11058 #endif
11059         mout = sctp_get_mbuf_for_msg(len + max_linkhdr, 1, M_NOWAIT, 1, MT_DATA);
11060         if (mout == NULL) {
11061                 if (cause) {
11062                         sctp_m_freem(cause);
11063                 }
11064                 return;
11065         }
11066         SCTP_BUF_RESV_UF(mout, max_linkhdr);
11067         SCTP_BUF_LEN(mout) = len;
11068         SCTP_BUF_NEXT(mout) = cause;
11069         M_SETFIB(mout, fibnum);
11070         mout->m_pkthdr.flowid = mflowid;
11071         M_HASHTYPE_SET(mout, mflowtype);
11072 #ifdef INET
11073         ip = NULL;
11074 #endif
11075 #ifdef INET6
11076         ip6 = NULL;
11077 #endif
11078         switch (dst->sa_family) {
11079 #ifdef INET
11080         case AF_INET:
11081                 src_sin = (struct sockaddr_in *)src;
11082                 dst_sin = (struct sockaddr_in *)dst;
11083                 ip = mtod(mout, struct ip *);
11084                 ip->ip_v = IPVERSION;
11085                 ip->ip_hl = (sizeof(struct ip) >> 2);
11086                 ip->ip_tos = 0;
11087                 ip->ip_off = htons(IP_DF);
11088                 ip_fillid(ip);
11089                 ip->ip_ttl = MODULE_GLOBAL(ip_defttl);
11090                 if (port) {
11091                         ip->ip_p = IPPROTO_UDP;
11092                 } else {
11093                         ip->ip_p = IPPROTO_SCTP;
11094                 }
11095                 ip->ip_src.s_addr = dst_sin->sin_addr.s_addr;
11096                 ip->ip_dst.s_addr = src_sin->sin_addr.s_addr;
11097                 ip->ip_sum = 0;
11098                 len = sizeof(struct ip);
11099                 shout = (struct sctphdr *)((caddr_t)ip + len);
11100                 break;
11101 #endif
11102 #ifdef INET6
11103         case AF_INET6:
11104                 src_sin6 = (struct sockaddr_in6 *)src;
11105                 dst_sin6 = (struct sockaddr_in6 *)dst;
11106                 ip6 = mtod(mout, struct ip6_hdr *);
11107                 ip6->ip6_flow = htonl(0x60000000);
11108                 if (V_ip6_auto_flowlabel) {
11109                         ip6->ip6_flow |= (htonl(ip6_randomflowlabel()) & IPV6_FLOWLABEL_MASK);
11110                 }
11111                 ip6->ip6_hlim = MODULE_GLOBAL(ip6_defhlim);
11112                 if (port) {
11113                         ip6->ip6_nxt = IPPROTO_UDP;
11114                 } else {
11115                         ip6->ip6_nxt = IPPROTO_SCTP;
11116                 }
11117                 ip6->ip6_src = dst_sin6->sin6_addr;
11118                 ip6->ip6_dst = src_sin6->sin6_addr;
11119                 len = sizeof(struct ip6_hdr);
11120                 shout = (struct sctphdr *)((caddr_t)ip6 + len);
11121                 break;
11122 #endif
11123         default:
11124                 len = 0;
11125                 shout = mtod(mout, struct sctphdr *);
11126                 break;
11127         }
11128 #if defined(INET) || defined(INET6)
11129         if (port) {
11130                 if (htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port)) == 0) {
11131                         sctp_m_freem(mout);
11132                         return;
11133                 }
11134                 udp = (struct udphdr *)shout;
11135                 udp->uh_sport = htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port));
11136                 udp->uh_dport = port;
11137                 udp->uh_sum = 0;
11138                 udp->uh_ulen = htons((uint16_t)(sizeof(struct udphdr) +
11139                     sizeof(struct sctphdr) +
11140                     sizeof(struct sctp_chunkhdr) +
11141                     cause_len + padding_len));
11142                 len += sizeof(struct udphdr);
11143                 shout = (struct sctphdr *)((caddr_t)shout + sizeof(struct udphdr));
11144         } else {
11145                 udp = NULL;
11146         }
11147 #endif
11148         shout->src_port = sh->dest_port;
11149         shout->dest_port = sh->src_port;
11150         shout->checksum = 0;
11151         if (vtag) {
11152                 shout->v_tag = htonl(vtag);
11153         } else {
11154                 shout->v_tag = sh->v_tag;
11155         }
11156         len += sizeof(struct sctphdr);
11157         ch = (struct sctp_chunkhdr *)((caddr_t)shout + sizeof(struct sctphdr));
11158         ch->chunk_type = type;
11159         if (vtag) {
11160                 ch->chunk_flags = 0;
11161         } else {
11162                 ch->chunk_flags = SCTP_HAD_NO_TCB;
11163         }
11164         ch->chunk_length = htons((uint16_t)(sizeof(struct sctp_chunkhdr) + cause_len));
11165         len += sizeof(struct sctp_chunkhdr);
11166         len += cause_len + padding_len;
11167
11168         if (SCTP_GET_HEADER_FOR_OUTPUT(o_pak)) {
11169                 sctp_m_freem(mout);
11170                 return;
11171         }
11172         SCTP_ATTACH_CHAIN(o_pak, mout, len);
11173         switch (dst->sa_family) {
11174 #ifdef INET
11175         case AF_INET:
11176                 if (port) {
11177                         if (V_udp_cksum) {
11178                                 udp->uh_sum = in_pseudo(ip->ip_src.s_addr, ip->ip_dst.s_addr, udp->uh_ulen + htons(IPPROTO_UDP));
11179                         } else {
11180                                 udp->uh_sum = 0;
11181                         }
11182                 }
11183                 ip->ip_len = htons(len);
11184                 if (port) {
11185                         shout->checksum = sctp_calculate_cksum(mout, sizeof(struct ip) + sizeof(struct udphdr));
11186                         SCTP_STAT_INCR(sctps_sendswcrc);
11187                         if (V_udp_cksum) {
11188                                 SCTP_ENABLE_UDP_CSUM(o_pak);
11189                         }
11190                 } else {
11191                         mout->m_pkthdr.csum_flags = CSUM_SCTP;
11192                         mout->m_pkthdr.csum_data = offsetof(struct sctphdr, checksum);
11193                         SCTP_STAT_INCR(sctps_sendhwcrc);
11194                 }
11195 #ifdef SCTP_PACKET_LOGGING
11196                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING) {
11197                         sctp_packet_log(o_pak);
11198                 }
11199 #endif
11200                 SCTP_PROBE5(send, NULL, NULL, ip, NULL, shout);
11201                 SCTP_IP_OUTPUT(ret, o_pak, NULL, NULL, vrf_id);
11202                 break;
11203 #endif
11204 #ifdef INET6
11205         case AF_INET6:
11206                 ip6->ip6_plen = htons((uint16_t)(len - sizeof(struct ip6_hdr)));
11207                 if (port) {
11208                         shout->checksum = sctp_calculate_cksum(mout, sizeof(struct ip6_hdr) + sizeof(struct udphdr));
11209                         SCTP_STAT_INCR(sctps_sendswcrc);
11210                         if ((udp->uh_sum = in6_cksum(o_pak, IPPROTO_UDP, sizeof(struct ip6_hdr), len - sizeof(struct ip6_hdr))) == 0) {
11211                                 udp->uh_sum = 0xffff;
11212                         }
11213                 } else {
11214                         mout->m_pkthdr.csum_flags = CSUM_SCTP_IPV6;
11215                         mout->m_pkthdr.csum_data = offsetof(struct sctphdr, checksum);
11216                         SCTP_STAT_INCR(sctps_sendhwcrc);
11217                 }
11218 #ifdef SCTP_PACKET_LOGGING
11219                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING) {
11220                         sctp_packet_log(o_pak);
11221                 }
11222 #endif
11223                 SCTP_PROBE5(send, NULL, NULL, ip6, NULL, shout);
11224                 SCTP_IP6_OUTPUT(ret, o_pak, NULL, NULL, NULL, vrf_id);
11225                 break;
11226 #endif
11227         default:
11228                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Unknown protocol (TSNH) type %d\n",
11229                     dst->sa_family);
11230                 sctp_m_freem(mout);
11231                 SCTP_LTRACE_ERR_RET_PKT(mout, NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EFAULT);
11232                 return;
11233         }
11234         SCTPDBG(SCTP_DEBUG_OUTPUT3, "return from send is %d\n", ret);
11235         if (port) {
11236                 UDPSTAT_INC(udps_opackets);
11237         }
11238         SCTP_STAT_INCR(sctps_sendpackets);
11239         SCTP_STAT_INCR_COUNTER64(sctps_outpackets);
11240         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
11241         if (ret) {
11242                 SCTP_STAT_INCR(sctps_senderrors);
11243         }
11244         return;
11245 }
11246
11247 void
11248 sctp_send_shutdown_complete2(struct sockaddr *src, struct sockaddr *dst,
11249     struct sctphdr *sh,
11250     uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum,
11251     uint32_t vrf_id, uint16_t port)
11252 {
11253         sctp_send_resp_msg(src, dst, sh, 0, SCTP_SHUTDOWN_COMPLETE, NULL,
11254             mflowtype, mflowid, fibnum,
11255             vrf_id, port);
11256 }
11257
11258 void
11259 sctp_send_hb(struct sctp_tcb *stcb, struct sctp_nets *net, int so_locked)
11260 {
11261         struct sctp_tmit_chunk *chk;
11262         struct sctp_heartbeat_chunk *hb;
11263         struct timeval now;
11264
11265         SCTP_TCB_LOCK_ASSERT(stcb);
11266         if (net == NULL) {
11267                 return;
11268         }
11269         (void)SCTP_GETTIME_TIMEVAL(&now);
11270         switch (net->ro._l_addr.sa.sa_family) {
11271 #ifdef INET
11272         case AF_INET:
11273                 break;
11274 #endif
11275 #ifdef INET6
11276         case AF_INET6:
11277                 break;
11278 #endif
11279         default:
11280                 return;
11281         }
11282         sctp_alloc_a_chunk(stcb, chk);
11283         if (chk == NULL) {
11284                 SCTPDBG(SCTP_DEBUG_OUTPUT4, "Gak, can't get a chunk for hb\n");
11285                 return;
11286         }
11287
11288         chk->copy_by_ref = 0;
11289         chk->rec.chunk_id.id = SCTP_HEARTBEAT_REQUEST;
11290         chk->rec.chunk_id.can_take_data = 1;
11291         chk->flags = 0;
11292         chk->asoc = &stcb->asoc;
11293         chk->send_size = sizeof(struct sctp_heartbeat_chunk);
11294
11295         chk->data = sctp_get_mbuf_for_msg(chk->send_size, 0, M_NOWAIT, 1, MT_HEADER);
11296         if (chk->data == NULL) {
11297                 sctp_free_a_chunk(stcb, chk, so_locked);
11298                 return;
11299         }
11300         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11301         SCTP_BUF_LEN(chk->data) = chk->send_size;
11302         chk->sent = SCTP_DATAGRAM_UNSENT;
11303         chk->snd_count = 0;
11304         chk->whoTo = net;
11305         atomic_add_int(&chk->whoTo->ref_count, 1);
11306         /* Now we have a mbuf that we can fill in with the details */
11307         hb = mtod(chk->data, struct sctp_heartbeat_chunk *);
11308         memset(hb, 0, sizeof(struct sctp_heartbeat_chunk));
11309         /* fill out chunk header */
11310         hb->ch.chunk_type = SCTP_HEARTBEAT_REQUEST;
11311         hb->ch.chunk_flags = 0;
11312         hb->ch.chunk_length = htons(chk->send_size);
11313         /* Fill out hb parameter */
11314         hb->heartbeat.hb_info.ph.param_type = htons(SCTP_HEARTBEAT_INFO);
11315         hb->heartbeat.hb_info.ph.param_length = htons(sizeof(struct sctp_heartbeat_info_param));
11316         hb->heartbeat.hb_info.time_value_1 = now.tv_sec;
11317         hb->heartbeat.hb_info.time_value_2 = now.tv_usec;
11318         /* Did our user request this one, put it in */
11319         hb->heartbeat.hb_info.addr_family = (uint8_t)net->ro._l_addr.sa.sa_family;
11320         hb->heartbeat.hb_info.addr_len = net->ro._l_addr.sa.sa_len;
11321         if (net->dest_state & SCTP_ADDR_UNCONFIRMED) {
11322                 /*
11323                  * we only take from the entropy pool if the address is not
11324                  * confirmed.
11325                  */
11326                 net->heartbeat_random1 = hb->heartbeat.hb_info.random_value1 = sctp_select_initial_TSN(&stcb->sctp_ep->sctp_ep);
11327                 net->heartbeat_random2 = hb->heartbeat.hb_info.random_value2 = sctp_select_initial_TSN(&stcb->sctp_ep->sctp_ep);
11328         } else {
11329                 net->heartbeat_random1 = hb->heartbeat.hb_info.random_value1 = 0;
11330                 net->heartbeat_random2 = hb->heartbeat.hb_info.random_value2 = 0;
11331         }
11332         switch (net->ro._l_addr.sa.sa_family) {
11333 #ifdef INET
11334         case AF_INET:
11335                 memcpy(hb->heartbeat.hb_info.address,
11336                     &net->ro._l_addr.sin.sin_addr,
11337                     sizeof(net->ro._l_addr.sin.sin_addr));
11338                 break;
11339 #endif
11340 #ifdef INET6
11341         case AF_INET6:
11342                 memcpy(hb->heartbeat.hb_info.address,
11343                     &net->ro._l_addr.sin6.sin6_addr,
11344                     sizeof(net->ro._l_addr.sin6.sin6_addr));
11345                 break;
11346 #endif
11347         default:
11348                 if (chk->data) {
11349                         sctp_m_freem(chk->data);
11350                         chk->data = NULL;
11351                 }
11352                 sctp_free_a_chunk(stcb, chk, so_locked);
11353                 return;
11354                 break;
11355         }
11356         net->hb_responded = 0;
11357         TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
11358         stcb->asoc.ctrl_queue_cnt++;
11359         SCTP_STAT_INCR(sctps_sendheartbeat);
11360         return;
11361 }
11362
11363 void
11364 sctp_send_ecn_echo(struct sctp_tcb *stcb, struct sctp_nets *net,
11365     uint32_t high_tsn)
11366 {
11367         struct sctp_association *asoc;
11368         struct sctp_ecne_chunk *ecne;
11369         struct sctp_tmit_chunk *chk;
11370
11371         if (net == NULL) {
11372                 return;
11373         }
11374         asoc = &stcb->asoc;
11375         SCTP_TCB_LOCK_ASSERT(stcb);
11376         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
11377                 if ((chk->rec.chunk_id.id == SCTP_ECN_ECHO) && (net == chk->whoTo)) {
11378                         /* found a previous ECN_ECHO update it if needed */
11379                         uint32_t cnt, ctsn;
11380
11381                         ecne = mtod(chk->data, struct sctp_ecne_chunk *);
11382                         ctsn = ntohl(ecne->tsn);
11383                         if (SCTP_TSN_GT(high_tsn, ctsn)) {
11384                                 ecne->tsn = htonl(high_tsn);
11385                                 SCTP_STAT_INCR(sctps_queue_upd_ecne);
11386                         }
11387                         cnt = ntohl(ecne->num_pkts_since_cwr);
11388                         cnt++;
11389                         ecne->num_pkts_since_cwr = htonl(cnt);
11390                         return;
11391                 }
11392         }
11393         /* nope could not find one to update so we must build one */
11394         sctp_alloc_a_chunk(stcb, chk);
11395         if (chk == NULL) {
11396                 return;
11397         }
11398         SCTP_STAT_INCR(sctps_queue_upd_ecne);
11399         chk->copy_by_ref = 0;
11400         chk->rec.chunk_id.id = SCTP_ECN_ECHO;
11401         chk->rec.chunk_id.can_take_data = 0;
11402         chk->flags = 0;
11403         chk->asoc = &stcb->asoc;
11404         chk->send_size = sizeof(struct sctp_ecne_chunk);
11405         chk->data = sctp_get_mbuf_for_msg(chk->send_size, 0, M_NOWAIT, 1, MT_HEADER);
11406         if (chk->data == NULL) {
11407                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
11408                 return;
11409         }
11410         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11411         SCTP_BUF_LEN(chk->data) = chk->send_size;
11412         chk->sent = SCTP_DATAGRAM_UNSENT;
11413         chk->snd_count = 0;
11414         chk->whoTo = net;
11415         atomic_add_int(&chk->whoTo->ref_count, 1);
11416
11417         stcb->asoc.ecn_echo_cnt_onq++;
11418         ecne = mtod(chk->data, struct sctp_ecne_chunk *);
11419         ecne->ch.chunk_type = SCTP_ECN_ECHO;
11420         ecne->ch.chunk_flags = 0;
11421         ecne->ch.chunk_length = htons(sizeof(struct sctp_ecne_chunk));
11422         ecne->tsn = htonl(high_tsn);
11423         ecne->num_pkts_since_cwr = htonl(1);
11424         TAILQ_INSERT_HEAD(&stcb->asoc.control_send_queue, chk, sctp_next);
11425         asoc->ctrl_queue_cnt++;
11426 }
11427
11428 void
11429 sctp_send_packet_dropped(struct sctp_tcb *stcb, struct sctp_nets *net,
11430     struct mbuf *m, int len, int iphlen, int bad_crc)
11431 {
11432         struct sctp_association *asoc;
11433         struct sctp_pktdrop_chunk *drp;
11434         struct sctp_tmit_chunk *chk;
11435         uint8_t *datap;
11436         int was_trunc = 0;
11437         int fullsz = 0;
11438         long spc;
11439         int offset;
11440         struct sctp_chunkhdr *ch, chunk_buf;
11441         unsigned int chk_length;
11442
11443         if (!stcb) {
11444                 return;
11445         }
11446         asoc = &stcb->asoc;
11447         SCTP_TCB_LOCK_ASSERT(stcb);
11448         if (asoc->pktdrop_supported == 0) {
11449                 /*-
11450                  * peer must declare support before I send one.
11451                  */
11452                 return;
11453         }
11454         if (stcb->sctp_socket == NULL) {
11455                 return;
11456         }
11457         sctp_alloc_a_chunk(stcb, chk);
11458         if (chk == NULL) {
11459                 return;
11460         }
11461         chk->copy_by_ref = 0;
11462         chk->rec.chunk_id.id = SCTP_PACKET_DROPPED;
11463         chk->rec.chunk_id.can_take_data = 1;
11464         chk->flags = 0;
11465         len -= iphlen;
11466         chk->send_size = len;
11467         /* Validate that we do not have an ABORT in here. */
11468         offset = iphlen + sizeof(struct sctphdr);
11469         ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, offset,
11470             sizeof(*ch), (uint8_t *)&chunk_buf);
11471         while (ch != NULL) {
11472                 chk_length = ntohs(ch->chunk_length);
11473                 if (chk_length < sizeof(*ch)) {
11474                         /* break to abort land */
11475                         break;
11476                 }
11477                 switch (ch->chunk_type) {
11478                 case SCTP_PACKET_DROPPED:
11479                 case SCTP_ABORT_ASSOCIATION:
11480                 case SCTP_INITIATION_ACK:
11481                         /**
11482                          * We don't respond with an PKT-DROP to an ABORT
11483                          * or PKT-DROP. We also do not respond to an
11484                          * INIT-ACK, because we can't know if the initiation
11485                          * tag is correct or not.
11486                          */
11487                         sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
11488                         return;
11489                 default:
11490                         break;
11491                 }
11492                 offset += SCTP_SIZE32(chk_length);
11493                 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, offset,
11494                     sizeof(*ch), (uint8_t *)&chunk_buf);
11495         }
11496
11497         if ((len + SCTP_MAX_OVERHEAD + sizeof(struct sctp_pktdrop_chunk)) >
11498             min(stcb->asoc.smallest_mtu, MCLBYTES)) {
11499                 /*
11500                  * only send 1 mtu worth, trim off the excess on the end.
11501                  */
11502                 fullsz = len;
11503                 len = min(stcb->asoc.smallest_mtu, MCLBYTES) - SCTP_MAX_OVERHEAD;
11504                 was_trunc = 1;
11505         }
11506         chk->asoc = &stcb->asoc;
11507         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
11508         if (chk->data == NULL) {
11509 jump_out:
11510                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
11511                 return;
11512         }
11513         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11514         drp = mtod(chk->data, struct sctp_pktdrop_chunk *);
11515         if (drp == NULL) {
11516                 sctp_m_freem(chk->data);
11517                 chk->data = NULL;
11518                 goto jump_out;
11519         }
11520         chk->book_size = SCTP_SIZE32((chk->send_size + sizeof(struct sctp_pktdrop_chunk) +
11521             sizeof(struct sctphdr) + SCTP_MED_OVERHEAD));
11522         chk->book_size_scale = 0;
11523         if (was_trunc) {
11524                 drp->ch.chunk_flags = SCTP_PACKET_TRUNCATED;
11525                 drp->trunc_len = htons(fullsz);
11526                 /*
11527                  * Len is already adjusted to size minus overhead above take
11528                  * out the pkt_drop chunk itself from it.
11529                  */
11530                 chk->send_size = (uint16_t)(len - sizeof(struct sctp_pktdrop_chunk));
11531                 len = chk->send_size;
11532         } else {
11533                 /* no truncation needed */
11534                 drp->ch.chunk_flags = 0;
11535                 drp->trunc_len = htons(0);
11536         }
11537         if (bad_crc) {
11538                 drp->ch.chunk_flags |= SCTP_BADCRC;
11539         }
11540         chk->send_size += sizeof(struct sctp_pktdrop_chunk);
11541         SCTP_BUF_LEN(chk->data) = chk->send_size;
11542         chk->sent = SCTP_DATAGRAM_UNSENT;
11543         chk->snd_count = 0;
11544         if (net) {
11545                 /* we should hit here */
11546                 chk->whoTo = net;
11547                 atomic_add_int(&chk->whoTo->ref_count, 1);
11548         } else {
11549                 chk->whoTo = NULL;
11550         }
11551         drp->ch.chunk_type = SCTP_PACKET_DROPPED;
11552         drp->ch.chunk_length = htons(chk->send_size);
11553         spc = SCTP_SB_LIMIT_RCV(stcb->sctp_socket);
11554         if (spc < 0) {
11555                 spc = 0;
11556         }
11557         drp->bottle_bw = htonl(spc);
11558         if (asoc->my_rwnd) {
11559                 drp->current_onq = htonl(asoc->size_on_reasm_queue +
11560                     asoc->size_on_all_streams +
11561                     asoc->my_rwnd_control_len +
11562                     stcb->sctp_socket->so_rcv.sb_cc);
11563         } else {
11564                 /*-
11565                  * If my rwnd is 0, possibly from mbuf depletion as well as
11566                  * space used, tell the peer there is NO space aka onq == bw
11567                  */
11568                 drp->current_onq = htonl(spc);
11569         }
11570         drp->reserved = 0;
11571         datap = drp->data;
11572         m_copydata(m, iphlen, len, (caddr_t)datap);
11573         TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
11574         asoc->ctrl_queue_cnt++;
11575 }
11576
11577 void
11578 sctp_send_cwr(struct sctp_tcb *stcb, struct sctp_nets *net, uint32_t high_tsn, uint8_t override)
11579 {
11580         struct sctp_association *asoc;
11581         struct sctp_cwr_chunk *cwr;
11582         struct sctp_tmit_chunk *chk;
11583
11584         SCTP_TCB_LOCK_ASSERT(stcb);
11585         if (net == NULL) {
11586                 return;
11587         }
11588         asoc = &stcb->asoc;
11589         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
11590                 if ((chk->rec.chunk_id.id == SCTP_ECN_CWR) && (net == chk->whoTo)) {
11591                         /*
11592                          * found a previous CWR queued to same destination
11593                          * update it if needed
11594                          */
11595                         uint32_t ctsn;
11596
11597                         cwr = mtod(chk->data, struct sctp_cwr_chunk *);
11598                         ctsn = ntohl(cwr->tsn);
11599                         if (SCTP_TSN_GT(high_tsn, ctsn)) {
11600                                 cwr->tsn = htonl(high_tsn);
11601                         }
11602                         if (override & SCTP_CWR_REDUCE_OVERRIDE) {
11603                                 /* Make sure override is carried */
11604                                 cwr->ch.chunk_flags |= SCTP_CWR_REDUCE_OVERRIDE;
11605                         }
11606                         return;
11607                 }
11608         }
11609         sctp_alloc_a_chunk(stcb, chk);
11610         if (chk == NULL) {
11611                 return;
11612         }
11613         chk->copy_by_ref = 0;
11614         chk->rec.chunk_id.id = SCTP_ECN_CWR;
11615         chk->rec.chunk_id.can_take_data = 1;
11616         chk->flags = 0;
11617         chk->asoc = &stcb->asoc;
11618         chk->send_size = sizeof(struct sctp_cwr_chunk);
11619         chk->data = sctp_get_mbuf_for_msg(chk->send_size, 0, M_NOWAIT, 1, MT_HEADER);
11620         if (chk->data == NULL) {
11621                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
11622                 return;
11623         }
11624         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11625         SCTP_BUF_LEN(chk->data) = chk->send_size;
11626         chk->sent = SCTP_DATAGRAM_UNSENT;
11627         chk->snd_count = 0;
11628         chk->whoTo = net;
11629         atomic_add_int(&chk->whoTo->ref_count, 1);
11630         cwr = mtod(chk->data, struct sctp_cwr_chunk *);
11631         cwr->ch.chunk_type = SCTP_ECN_CWR;
11632         cwr->ch.chunk_flags = override;
11633         cwr->ch.chunk_length = htons(sizeof(struct sctp_cwr_chunk));
11634         cwr->tsn = htonl(high_tsn);
11635         TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
11636         asoc->ctrl_queue_cnt++;
11637 }
11638
11639 static int
11640 sctp_add_stream_reset_out(struct sctp_tcb *stcb, struct sctp_tmit_chunk *chk,
11641     uint32_t seq, uint32_t resp_seq, uint32_t last_sent)
11642 {
11643         uint16_t len, old_len, i;
11644         struct sctp_stream_reset_out_request *req_out;
11645         struct sctp_chunkhdr *ch;
11646         int at;
11647         int number_entries = 0;
11648
11649         ch = mtod(chk->data, struct sctp_chunkhdr *);
11650         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11651         /* get to new offset for the param. */
11652         req_out = (struct sctp_stream_reset_out_request *)((caddr_t)ch + len);
11653         /* now how long will this param be? */
11654         for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
11655                 if ((stcb->asoc.strmout[i].state == SCTP_STREAM_RESET_PENDING) &&
11656                     (stcb->asoc.strmout[i].chunks_on_queues == 0) &&
11657                     TAILQ_EMPTY(&stcb->asoc.strmout[i].outqueue)) {
11658                         number_entries++;
11659                 }
11660         }
11661         if (number_entries == 0) {
11662                 return (0);
11663         }
11664         if (number_entries == stcb->asoc.streamoutcnt) {
11665                 number_entries = 0;
11666         }
11667         if (number_entries > SCTP_MAX_STREAMS_AT_ONCE_RESET) {
11668                 number_entries = SCTP_MAX_STREAMS_AT_ONCE_RESET;
11669         }
11670         len = (uint16_t)(sizeof(struct sctp_stream_reset_out_request) + (sizeof(uint16_t) * number_entries));
11671         req_out->ph.param_type = htons(SCTP_STR_RESET_OUT_REQUEST);
11672         req_out->ph.param_length = htons(len);
11673         req_out->request_seq = htonl(seq);
11674         req_out->response_seq = htonl(resp_seq);
11675         req_out->send_reset_at_tsn = htonl(last_sent);
11676         at = 0;
11677         if (number_entries) {
11678                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
11679                         if ((stcb->asoc.strmout[i].state == SCTP_STREAM_RESET_PENDING) &&
11680                             (stcb->asoc.strmout[i].chunks_on_queues == 0) &&
11681                             TAILQ_EMPTY(&stcb->asoc.strmout[i].outqueue)) {
11682                                 req_out->list_of_streams[at] = htons(i);
11683                                 at++;
11684                                 stcb->asoc.strmout[i].state = SCTP_STREAM_RESET_IN_FLIGHT;
11685                                 if (at >= number_entries) {
11686                                         break;
11687                                 }
11688                         }
11689                 }
11690         } else {
11691                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
11692                         stcb->asoc.strmout[i].state = SCTP_STREAM_RESET_IN_FLIGHT;
11693                 }
11694         }
11695         if (SCTP_SIZE32(len) > len) {
11696                 /*-
11697                  * Need to worry about the pad we may end up adding to the
11698                  * end. This is easy since the struct is either aligned to 4
11699                  * bytes or 2 bytes off.
11700                  */
11701                 req_out->list_of_streams[number_entries] = 0;
11702         }
11703         /* now fix the chunk length */
11704         ch->chunk_length = htons(len + old_len);
11705         chk->book_size = len + old_len;
11706         chk->book_size_scale = 0;
11707         chk->send_size = SCTP_SIZE32(chk->book_size);
11708         SCTP_BUF_LEN(chk->data) = chk->send_size;
11709         return (1);
11710 }
11711
11712 static void
11713 sctp_add_stream_reset_in(struct sctp_tmit_chunk *chk,
11714     int number_entries, uint16_t *list,
11715     uint32_t seq)
11716 {
11717         uint16_t len, old_len, i;
11718         struct sctp_stream_reset_in_request *req_in;
11719         struct sctp_chunkhdr *ch;
11720
11721         ch = mtod(chk->data, struct sctp_chunkhdr *);
11722         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11723
11724         /* get to new offset for the param. */
11725         req_in = (struct sctp_stream_reset_in_request *)((caddr_t)ch + len);
11726         /* now how long will this param be? */
11727         len = (uint16_t)(sizeof(struct sctp_stream_reset_in_request) + (sizeof(uint16_t) * number_entries));
11728         req_in->ph.param_type = htons(SCTP_STR_RESET_IN_REQUEST);
11729         req_in->ph.param_length = htons(len);
11730         req_in->request_seq = htonl(seq);
11731         if (number_entries) {
11732                 for (i = 0; i < number_entries; i++) {
11733                         req_in->list_of_streams[i] = htons(list[i]);
11734                 }
11735         }
11736         if (SCTP_SIZE32(len) > len) {
11737                 /*-
11738                  * Need to worry about the pad we may end up adding to the
11739                  * end. This is easy since the struct is either aligned to 4
11740                  * bytes or 2 bytes off.
11741                  */
11742                 req_in->list_of_streams[number_entries] = 0;
11743         }
11744         /* now fix the chunk length */
11745         ch->chunk_length = htons(len + old_len);
11746         chk->book_size = len + old_len;
11747         chk->book_size_scale = 0;
11748         chk->send_size = SCTP_SIZE32(chk->book_size);
11749         SCTP_BUF_LEN(chk->data) = chk->send_size;
11750         return;
11751 }
11752
11753 static void
11754 sctp_add_stream_reset_tsn(struct sctp_tmit_chunk *chk,
11755     uint32_t seq)
11756 {
11757         uint16_t len, old_len;
11758         struct sctp_stream_reset_tsn_request *req_tsn;
11759         struct sctp_chunkhdr *ch;
11760
11761         ch = mtod(chk->data, struct sctp_chunkhdr *);
11762         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11763
11764         /* get to new offset for the param. */
11765         req_tsn = (struct sctp_stream_reset_tsn_request *)((caddr_t)ch + len);
11766         /* now how long will this param be? */
11767         len = sizeof(struct sctp_stream_reset_tsn_request);
11768         req_tsn->ph.param_type = htons(SCTP_STR_RESET_TSN_REQUEST);
11769         req_tsn->ph.param_length = htons(len);
11770         req_tsn->request_seq = htonl(seq);
11771
11772         /* now fix the chunk length */
11773         ch->chunk_length = htons(len + old_len);
11774         chk->send_size = len + old_len;
11775         chk->book_size = SCTP_SIZE32(chk->send_size);
11776         chk->book_size_scale = 0;
11777         SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size);
11778         return;
11779 }
11780
11781 void
11782 sctp_add_stream_reset_result(struct sctp_tmit_chunk *chk,
11783     uint32_t resp_seq, uint32_t result)
11784 {
11785         uint16_t len, old_len;
11786         struct sctp_stream_reset_response *resp;
11787         struct sctp_chunkhdr *ch;
11788
11789         ch = mtod(chk->data, struct sctp_chunkhdr *);
11790         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11791
11792         /* get to new offset for the param. */
11793         resp = (struct sctp_stream_reset_response *)((caddr_t)ch + len);
11794         /* now how long will this param be? */
11795         len = sizeof(struct sctp_stream_reset_response);
11796         resp->ph.param_type = htons(SCTP_STR_RESET_RESPONSE);
11797         resp->ph.param_length = htons(len);
11798         resp->response_seq = htonl(resp_seq);
11799         resp->result = ntohl(result);
11800
11801         /* now fix the chunk length */
11802         ch->chunk_length = htons(len + old_len);
11803         chk->book_size = len + old_len;
11804         chk->book_size_scale = 0;
11805         chk->send_size = SCTP_SIZE32(chk->book_size);
11806         SCTP_BUF_LEN(chk->data) = chk->send_size;
11807         return;
11808 }
11809
11810 void
11811 sctp_send_deferred_reset_response(struct sctp_tcb *stcb,
11812     struct sctp_stream_reset_list *ent,
11813     int response)
11814 {
11815         struct sctp_association *asoc;
11816         struct sctp_tmit_chunk *chk;
11817         struct sctp_chunkhdr *ch;
11818
11819         asoc = &stcb->asoc;
11820
11821         /*
11822          * Reset our last reset action to the new one IP -> response
11823          * (PERFORMED probably). This assures that if we fail to send, a
11824          * retran from the peer will get the new response.
11825          */
11826         asoc->last_reset_action[0] = response;
11827         if (asoc->stream_reset_outstanding) {
11828                 return;
11829         }
11830         sctp_alloc_a_chunk(stcb, chk);
11831         if (chk == NULL) {
11832                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
11833                 return;
11834         }
11835         chk->copy_by_ref = 0;
11836         chk->rec.chunk_id.id = SCTP_STREAM_RESET;
11837         chk->rec.chunk_id.can_take_data = 0;
11838         chk->flags = 0;
11839         chk->asoc = &stcb->asoc;
11840         chk->book_size = sizeof(struct sctp_chunkhdr);
11841         chk->send_size = SCTP_SIZE32(chk->book_size);
11842         chk->book_size_scale = 0;
11843         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
11844         if (chk->data == NULL) {
11845                 sctp_free_a_chunk(stcb, chk, SCTP_SO_LOCKED);
11846                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
11847                 return;
11848         }
11849         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11850         /* setup chunk parameters */
11851         chk->sent = SCTP_DATAGRAM_UNSENT;
11852         chk->snd_count = 0;
11853         if (stcb->asoc.alternate) {
11854                 chk->whoTo = stcb->asoc.alternate;
11855         } else {
11856                 chk->whoTo = stcb->asoc.primary_destination;
11857         }
11858         ch = mtod(chk->data, struct sctp_chunkhdr *);
11859         ch->chunk_type = SCTP_STREAM_RESET;
11860         ch->chunk_flags = 0;
11861         ch->chunk_length = htons(chk->book_size);
11862         atomic_add_int(&chk->whoTo->ref_count, 1);
11863         SCTP_BUF_LEN(chk->data) = chk->send_size;
11864         sctp_add_stream_reset_result(chk, ent->seq, response);
11865         /* insert the chunk for sending */
11866         TAILQ_INSERT_TAIL(&asoc->control_send_queue,
11867             chk,
11868             sctp_next);
11869         asoc->ctrl_queue_cnt++;
11870 }
11871
11872 void
11873 sctp_add_stream_reset_result_tsn(struct sctp_tmit_chunk *chk,
11874     uint32_t resp_seq, uint32_t result,
11875     uint32_t send_una, uint32_t recv_next)
11876 {
11877         uint16_t len, old_len;
11878         struct sctp_stream_reset_response_tsn *resp;
11879         struct sctp_chunkhdr *ch;
11880
11881         ch = mtod(chk->data, struct sctp_chunkhdr *);
11882         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11883
11884         /* get to new offset for the param. */
11885         resp = (struct sctp_stream_reset_response_tsn *)((caddr_t)ch + len);
11886         /* now how long will this param be? */
11887         len = sizeof(struct sctp_stream_reset_response_tsn);
11888         resp->ph.param_type = htons(SCTP_STR_RESET_RESPONSE);
11889         resp->ph.param_length = htons(len);
11890         resp->response_seq = htonl(resp_seq);
11891         resp->result = htonl(result);
11892         resp->senders_next_tsn = htonl(send_una);
11893         resp->receivers_next_tsn = htonl(recv_next);
11894
11895         /* now fix the chunk length */
11896         ch->chunk_length = htons(len + old_len);
11897         chk->book_size = len + old_len;
11898         chk->send_size = SCTP_SIZE32(chk->book_size);
11899         chk->book_size_scale = 0;
11900         SCTP_BUF_LEN(chk->data) = chk->send_size;
11901         return;
11902 }
11903
11904 static void
11905 sctp_add_an_out_stream(struct sctp_tmit_chunk *chk,
11906     uint32_t seq,
11907     uint16_t adding)
11908 {
11909         uint16_t len, old_len;
11910         struct sctp_chunkhdr *ch;
11911         struct sctp_stream_reset_add_strm *addstr;
11912
11913         ch = mtod(chk->data, struct sctp_chunkhdr *);
11914         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11915
11916         /* get to new offset for the param. */
11917         addstr = (struct sctp_stream_reset_add_strm *)((caddr_t)ch + len);
11918         /* now how long will this param be? */
11919         len = sizeof(struct sctp_stream_reset_add_strm);
11920
11921         /* Fill it out. */
11922         addstr->ph.param_type = htons(SCTP_STR_RESET_ADD_OUT_STREAMS);
11923         addstr->ph.param_length = htons(len);
11924         addstr->request_seq = htonl(seq);
11925         addstr->number_of_streams = htons(adding);
11926         addstr->reserved = 0;
11927
11928         /* now fix the chunk length */
11929         ch->chunk_length = htons(len + old_len);
11930         chk->send_size = len + old_len;
11931         chk->book_size = SCTP_SIZE32(chk->send_size);
11932         chk->book_size_scale = 0;
11933         SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size);
11934         return;
11935 }
11936
11937 static void
11938 sctp_add_an_in_stream(struct sctp_tmit_chunk *chk,
11939     uint32_t seq,
11940     uint16_t adding)
11941 {
11942         uint16_t len, old_len;
11943         struct sctp_chunkhdr *ch;
11944         struct sctp_stream_reset_add_strm *addstr;
11945
11946         ch = mtod(chk->data, struct sctp_chunkhdr *);
11947         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11948
11949         /* get to new offset for the param. */
11950         addstr = (struct sctp_stream_reset_add_strm *)((caddr_t)ch + len);
11951         /* now how long will this param be? */
11952         len = sizeof(struct sctp_stream_reset_add_strm);
11953         /* Fill it out. */
11954         addstr->ph.param_type = htons(SCTP_STR_RESET_ADD_IN_STREAMS);
11955         addstr->ph.param_length = htons(len);
11956         addstr->request_seq = htonl(seq);
11957         addstr->number_of_streams = htons(adding);
11958         addstr->reserved = 0;
11959
11960         /* now fix the chunk length */
11961         ch->chunk_length = htons(len + old_len);
11962         chk->send_size = len + old_len;
11963         chk->book_size = SCTP_SIZE32(chk->send_size);
11964         chk->book_size_scale = 0;
11965         SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size);
11966         return;
11967 }
11968
11969 int
11970 sctp_send_stream_reset_out_if_possible(struct sctp_tcb *stcb, int so_locked)
11971 {
11972         struct sctp_association *asoc;
11973         struct sctp_tmit_chunk *chk;
11974         struct sctp_chunkhdr *ch;
11975         uint32_t seq;
11976
11977         asoc = &stcb->asoc;
11978         asoc->trigger_reset = 0;
11979         if (asoc->stream_reset_outstanding) {
11980                 return (EALREADY);
11981         }
11982         sctp_alloc_a_chunk(stcb, chk);
11983         if (chk == NULL) {
11984                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
11985                 return (ENOMEM);
11986         }
11987         chk->copy_by_ref = 0;
11988         chk->rec.chunk_id.id = SCTP_STREAM_RESET;
11989         chk->rec.chunk_id.can_take_data = 0;
11990         chk->flags = 0;
11991         chk->asoc = &stcb->asoc;
11992         chk->book_size = sizeof(struct sctp_chunkhdr);
11993         chk->send_size = SCTP_SIZE32(chk->book_size);
11994         chk->book_size_scale = 0;
11995         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
11996         if (chk->data == NULL) {
11997                 sctp_free_a_chunk(stcb, chk, so_locked);
11998                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
11999                 return (ENOMEM);
12000         }
12001         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
12002
12003         /* setup chunk parameters */
12004         chk->sent = SCTP_DATAGRAM_UNSENT;
12005         chk->snd_count = 0;
12006         if (stcb->asoc.alternate) {
12007                 chk->whoTo = stcb->asoc.alternate;
12008         } else {
12009                 chk->whoTo = stcb->asoc.primary_destination;
12010         }
12011         ch = mtod(chk->data, struct sctp_chunkhdr *);
12012         ch->chunk_type = SCTP_STREAM_RESET;
12013         ch->chunk_flags = 0;
12014         ch->chunk_length = htons(chk->book_size);
12015         atomic_add_int(&chk->whoTo->ref_count, 1);
12016         SCTP_BUF_LEN(chk->data) = chk->send_size;
12017         seq = stcb->asoc.str_reset_seq_out;
12018         if (sctp_add_stream_reset_out(stcb, chk, seq, (stcb->asoc.str_reset_seq_in - 1), (stcb->asoc.sending_seq - 1))) {
12019                 seq++;
12020                 asoc->stream_reset_outstanding++;
12021         } else {
12022                 m_freem(chk->data);
12023                 chk->data = NULL;
12024                 sctp_free_a_chunk(stcb, chk, so_locked);
12025                 return (ENOENT);
12026         }
12027         asoc->str_reset = chk;
12028         /* insert the chunk for sending */
12029         TAILQ_INSERT_TAIL(&asoc->control_send_queue,
12030             chk,
12031             sctp_next);
12032         asoc->ctrl_queue_cnt++;
12033
12034         if (stcb->asoc.send_sack) {
12035                 sctp_send_sack(stcb, so_locked);
12036         }
12037         sctp_timer_start(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb, chk->whoTo);
12038         return (0);
12039 }
12040
12041 int
12042 sctp_send_str_reset_req(struct sctp_tcb *stcb,
12043     uint16_t number_entries, uint16_t *list,
12044     uint8_t send_in_req,
12045     uint8_t send_tsn_req,
12046     uint8_t add_stream,
12047     uint16_t adding_o,
12048     uint16_t adding_i, uint8_t peer_asked)
12049 {
12050         struct sctp_association *asoc;
12051         struct sctp_tmit_chunk *chk;
12052         struct sctp_chunkhdr *ch;
12053         int can_send_out_req = 0;
12054         uint32_t seq;
12055
12056         asoc = &stcb->asoc;
12057         if (asoc->stream_reset_outstanding) {
12058                 /*-
12059                  * Already one pending, must get ACK back to clear the flag.
12060                  */
12061                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EBUSY);
12062                 return (EBUSY);
12063         }
12064         if ((send_in_req == 0) && (send_tsn_req == 0) &&
12065             (add_stream == 0)) {
12066                 /* nothing to do */
12067                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12068                 return (EINVAL);
12069         }
12070         if (send_tsn_req && send_in_req) {
12071                 /* error, can't do that */
12072                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12073                 return (EINVAL);
12074         } else if (send_in_req) {
12075                 can_send_out_req = 1;
12076         }
12077         if (number_entries > (MCLBYTES -
12078             SCTP_MIN_OVERHEAD -
12079             sizeof(struct sctp_chunkhdr) -
12080             sizeof(struct sctp_stream_reset_out_request)) /
12081             sizeof(uint16_t)) {
12082                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12083                 return (ENOMEM);
12084         }
12085         sctp_alloc_a_chunk(stcb, chk);
12086         if (chk == NULL) {
12087                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12088                 return (ENOMEM);
12089         }
12090         chk->copy_by_ref = 0;
12091         chk->rec.chunk_id.id = SCTP_STREAM_RESET;
12092         chk->rec.chunk_id.can_take_data = 0;
12093         chk->flags = 0;
12094         chk->asoc = &stcb->asoc;
12095         chk->book_size = sizeof(struct sctp_chunkhdr);
12096         chk->send_size = SCTP_SIZE32(chk->book_size);
12097         chk->book_size_scale = 0;
12098         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
12099         if (chk->data == NULL) {
12100                 sctp_free_a_chunk(stcb, chk, SCTP_SO_LOCKED);
12101                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12102                 return (ENOMEM);
12103         }
12104         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
12105
12106         /* setup chunk parameters */
12107         chk->sent = SCTP_DATAGRAM_UNSENT;
12108         chk->snd_count = 0;
12109         if (stcb->asoc.alternate) {
12110                 chk->whoTo = stcb->asoc.alternate;
12111         } else {
12112                 chk->whoTo = stcb->asoc.primary_destination;
12113         }
12114         atomic_add_int(&chk->whoTo->ref_count, 1);
12115         ch = mtod(chk->data, struct sctp_chunkhdr *);
12116         ch->chunk_type = SCTP_STREAM_RESET;
12117         ch->chunk_flags = 0;
12118         ch->chunk_length = htons(chk->book_size);
12119         SCTP_BUF_LEN(chk->data) = chk->send_size;
12120
12121         seq = stcb->asoc.str_reset_seq_out;
12122         if (can_send_out_req) {
12123                 int ret;
12124
12125                 ret = sctp_add_stream_reset_out(stcb, chk, seq, (stcb->asoc.str_reset_seq_in - 1), (stcb->asoc.sending_seq - 1));
12126                 if (ret) {
12127                         seq++;
12128                         asoc->stream_reset_outstanding++;
12129                 }
12130         }
12131         if ((add_stream & 1) &&
12132             ((stcb->asoc.strm_realoutsize - stcb->asoc.streamoutcnt) < adding_o)) {
12133                 /* Need to allocate more */
12134                 struct sctp_stream_out *oldstream;
12135                 struct sctp_stream_queue_pending *sp, *nsp;
12136                 int i;
12137 #if defined(SCTP_DETAILED_STR_STATS)
12138                 int j;
12139 #endif
12140
12141                 oldstream = stcb->asoc.strmout;
12142                 /* get some more */
12143                 SCTP_MALLOC(stcb->asoc.strmout, struct sctp_stream_out *,
12144                     (stcb->asoc.streamoutcnt + adding_o) * sizeof(struct sctp_stream_out),
12145                     SCTP_M_STRMO);
12146                 if (stcb->asoc.strmout == NULL) {
12147                         uint8_t x;
12148
12149                         stcb->asoc.strmout = oldstream;
12150                         /* Turn off the bit */
12151                         x = add_stream & 0xfe;
12152                         add_stream = x;
12153                         goto skip_stuff;
12154                 }
12155                 /*
12156                  * Ok now we proceed with copying the old out stuff and
12157                  * initializing the new stuff.
12158                  */
12159                 SCTP_TCB_SEND_LOCK(stcb);
12160                 stcb->asoc.ss_functions.sctp_ss_clear(stcb, &stcb->asoc, 0, 1);
12161                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
12162                         TAILQ_INIT(&stcb->asoc.strmout[i].outqueue);
12163                         /* FIX ME FIX ME */
12164                         /*
12165                          * This should be a SS_COPY operation FIX ME STREAM
12166                          * SCHEDULER EXPERT
12167                          */
12168                         stcb->asoc.ss_functions.sctp_ss_init_stream(stcb, &stcb->asoc.strmout[i], &oldstream[i]);
12169                         stcb->asoc.strmout[i].chunks_on_queues = oldstream[i].chunks_on_queues;
12170 #if defined(SCTP_DETAILED_STR_STATS)
12171                         for (j = 0; j < SCTP_PR_SCTP_MAX + 1; j++) {
12172                                 stcb->asoc.strmout[i].abandoned_sent[j] = oldstream[i].abandoned_sent[j];
12173                                 stcb->asoc.strmout[i].abandoned_unsent[j] = oldstream[i].abandoned_unsent[j];
12174                         }
12175 #else
12176                         stcb->asoc.strmout[i].abandoned_sent[0] = oldstream[i].abandoned_sent[0];
12177                         stcb->asoc.strmout[i].abandoned_unsent[0] = oldstream[i].abandoned_unsent[0];
12178 #endif
12179                         stcb->asoc.strmout[i].next_mid_ordered = oldstream[i].next_mid_ordered;
12180                         stcb->asoc.strmout[i].next_mid_unordered = oldstream[i].next_mid_unordered;
12181                         stcb->asoc.strmout[i].last_msg_incomplete = oldstream[i].last_msg_incomplete;
12182                         stcb->asoc.strmout[i].sid = i;
12183                         stcb->asoc.strmout[i].state = oldstream[i].state;
12184                         /* now anything on those queues? */
12185                         TAILQ_FOREACH_SAFE(sp, &oldstream[i].outqueue, next, nsp) {
12186                                 TAILQ_REMOVE(&oldstream[i].outqueue, sp, next);
12187                                 TAILQ_INSERT_TAIL(&stcb->asoc.strmout[i].outqueue, sp, next);
12188                         }
12189                 }
12190                 /* now the new streams */
12191                 stcb->asoc.ss_functions.sctp_ss_init(stcb, &stcb->asoc, 1);
12192                 for (i = stcb->asoc.streamoutcnt; i < (stcb->asoc.streamoutcnt + adding_o); i++) {
12193                         TAILQ_INIT(&stcb->asoc.strmout[i].outqueue);
12194                         stcb->asoc.strmout[i].chunks_on_queues = 0;
12195 #if defined(SCTP_DETAILED_STR_STATS)
12196                         for (j = 0; j < SCTP_PR_SCTP_MAX + 1; j++) {
12197                                 stcb->asoc.strmout[i].abandoned_sent[j] = 0;
12198                                 stcb->asoc.strmout[i].abandoned_unsent[j] = 0;
12199                         }
12200 #else
12201                         stcb->asoc.strmout[i].abandoned_sent[0] = 0;
12202                         stcb->asoc.strmout[i].abandoned_unsent[0] = 0;
12203 #endif
12204                         stcb->asoc.strmout[i].next_mid_ordered = 0;
12205                         stcb->asoc.strmout[i].next_mid_unordered = 0;
12206                         stcb->asoc.strmout[i].sid = i;
12207                         stcb->asoc.strmout[i].last_msg_incomplete = 0;
12208                         stcb->asoc.ss_functions.sctp_ss_init_stream(stcb, &stcb->asoc.strmout[i], NULL);
12209                         stcb->asoc.strmout[i].state = SCTP_STREAM_CLOSED;
12210                 }
12211                 stcb->asoc.strm_realoutsize = stcb->asoc.streamoutcnt + adding_o;
12212                 SCTP_FREE(oldstream, SCTP_M_STRMO);
12213                 SCTP_TCB_SEND_UNLOCK(stcb);
12214         }
12215 skip_stuff:
12216         if ((add_stream & 1) && (adding_o > 0)) {
12217                 asoc->strm_pending_add_size = adding_o;
12218                 asoc->peer_req_out = peer_asked;
12219                 sctp_add_an_out_stream(chk, seq, adding_o);
12220                 seq++;
12221                 asoc->stream_reset_outstanding++;
12222         }
12223         if ((add_stream & 2) && (adding_i > 0)) {
12224                 sctp_add_an_in_stream(chk, seq, adding_i);
12225                 seq++;
12226                 asoc->stream_reset_outstanding++;
12227         }
12228         if (send_in_req) {
12229                 sctp_add_stream_reset_in(chk, number_entries, list, seq);
12230                 seq++;
12231                 asoc->stream_reset_outstanding++;
12232         }
12233         if (send_tsn_req) {
12234                 sctp_add_stream_reset_tsn(chk, seq);
12235                 asoc->stream_reset_outstanding++;
12236         }
12237         asoc->str_reset = chk;
12238         /* insert the chunk for sending */
12239         TAILQ_INSERT_TAIL(&asoc->control_send_queue,
12240             chk,
12241             sctp_next);
12242         asoc->ctrl_queue_cnt++;
12243         if (stcb->asoc.send_sack) {
12244                 sctp_send_sack(stcb, SCTP_SO_LOCKED);
12245         }
12246         sctp_timer_start(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb, chk->whoTo);
12247         return (0);
12248 }
12249
12250 void
12251 sctp_send_abort(struct mbuf *m, int iphlen, struct sockaddr *src, struct sockaddr *dst,
12252     struct sctphdr *sh, uint32_t vtag, struct mbuf *cause,
12253     uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum,
12254     uint32_t vrf_id, uint16_t port)
12255 {
12256         /* Don't respond to an ABORT with an ABORT. */
12257         if (sctp_is_there_an_abort_here(m, iphlen, &vtag)) {
12258                 if (cause)
12259                         sctp_m_freem(cause);
12260                 return;
12261         }
12262         sctp_send_resp_msg(src, dst, sh, vtag, SCTP_ABORT_ASSOCIATION, cause,
12263             mflowtype, mflowid, fibnum,
12264             vrf_id, port);
12265         return;
12266 }
12267
12268 void
12269 sctp_send_operr_to(struct sockaddr *src, struct sockaddr *dst,
12270     struct sctphdr *sh, uint32_t vtag, struct mbuf *cause,
12271     uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum,
12272     uint32_t vrf_id, uint16_t port)
12273 {
12274         sctp_send_resp_msg(src, dst, sh, vtag, SCTP_OPERATION_ERROR, cause,
12275             mflowtype, mflowid, fibnum,
12276             vrf_id, port);
12277         return;
12278 }
12279
12280 static struct mbuf *
12281 sctp_copy_resume(struct uio *uio,
12282     int max_send_len,
12283     int user_marks_eor,
12284     int *error,
12285     uint32_t *sndout,
12286     struct mbuf **new_tail)
12287 {
12288         struct mbuf *m;
12289
12290         m = m_uiotombuf(uio, M_WAITOK, max_send_len, 0,
12291             (M_PKTHDR | (user_marks_eor ? M_EOR : 0)));
12292         if (m == NULL) {
12293                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOBUFS);
12294                 *error = ENOBUFS;
12295         } else {
12296                 *sndout = m_length(m, NULL);
12297                 *new_tail = m_last(m);
12298         }
12299         return (m);
12300 }
12301
12302 static int
12303 sctp_copy_one(struct sctp_stream_queue_pending *sp,
12304     struct uio *uio,
12305     int resv_upfront)
12306 {
12307         sp->data = m_uiotombuf(uio, M_WAITOK, sp->length,
12308             resv_upfront, 0);
12309         if (sp->data == NULL) {
12310                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOBUFS);
12311                 return (ENOBUFS);
12312         }
12313
12314         sp->tail_mbuf = m_last(sp->data);
12315         return (0);
12316 }
12317
12318 static struct sctp_stream_queue_pending *
12319 sctp_copy_it_in(struct sctp_tcb *stcb,
12320     struct sctp_association *asoc,
12321     struct sctp_sndrcvinfo *srcv,
12322     struct uio *uio,
12323     struct sctp_nets *net,
12324     ssize_t max_send_len,
12325     int user_marks_eor,
12326     int *error)
12327 {
12328
12329         /*-
12330          * This routine must be very careful in its work. Protocol
12331          * processing is up and running so care must be taken to spl...()
12332          * when you need to do something that may effect the stcb/asoc. The
12333          * sb is locked however. When data is copied the protocol processing
12334          * should be enabled since this is a slower operation...
12335          */
12336         struct sctp_stream_queue_pending *sp = NULL;
12337         int resv_in_first;
12338
12339         *error = 0;
12340         /* Now can we send this? */
12341         if ((SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_SENT) ||
12342             (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_ACK_SENT) ||
12343             (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_RECEIVED) ||
12344             (asoc->state & SCTP_STATE_SHUTDOWN_PENDING)) {
12345                 /* got data while shutting down */
12346                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
12347                 *error = ECONNRESET;
12348                 goto out_now;
12349         }
12350         sctp_alloc_a_strmoq(stcb, sp);
12351         if (sp == NULL) {
12352                 SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12353                 *error = ENOMEM;
12354                 goto out_now;
12355         }
12356         sp->act_flags = 0;
12357         sp->sender_all_done = 0;
12358         sp->sinfo_flags = srcv->sinfo_flags;
12359         sp->timetolive = srcv->sinfo_timetolive;
12360         sp->ppid = srcv->sinfo_ppid;
12361         sp->context = srcv->sinfo_context;
12362         sp->fsn = 0;
12363         (void)SCTP_GETTIME_TIMEVAL(&sp->ts);
12364
12365         sp->sid = srcv->sinfo_stream;
12366         sp->length = (uint32_t)min(uio->uio_resid, max_send_len);
12367         if ((sp->length == (uint32_t)uio->uio_resid) &&
12368             ((user_marks_eor == 0) ||
12369             (srcv->sinfo_flags & SCTP_EOF) ||
12370             (user_marks_eor && (srcv->sinfo_flags & SCTP_EOR)))) {
12371                 sp->msg_is_complete = 1;
12372         } else {
12373                 sp->msg_is_complete = 0;
12374         }
12375         sp->sender_all_done = 0;
12376         sp->some_taken = 0;
12377         sp->put_last_out = 0;
12378         resv_in_first = SCTP_DATA_CHUNK_OVERHEAD(stcb);
12379         sp->data = sp->tail_mbuf = NULL;
12380         if (sp->length == 0) {
12381                 goto skip_copy;
12382         }
12383         if (srcv->sinfo_keynumber_valid) {
12384                 sp->auth_keyid = srcv->sinfo_keynumber;
12385         } else {
12386                 sp->auth_keyid = stcb->asoc.authinfo.active_keyid;
12387         }
12388         if (sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks)) {
12389                 sctp_auth_key_acquire(stcb, sp->auth_keyid);
12390                 sp->holds_key_ref = 1;
12391         }
12392         *error = sctp_copy_one(sp, uio, resv_in_first);
12393 skip_copy:
12394         if (*error) {
12395                 sctp_free_a_strmoq(stcb, sp, SCTP_SO_LOCKED);
12396                 sp = NULL;
12397         } else {
12398                 if (sp->sinfo_flags & SCTP_ADDR_OVER) {
12399                         sp->net = net;
12400                         atomic_add_int(&sp->net->ref_count, 1);
12401                 } else {
12402                         sp->net = NULL;
12403                 }
12404                 sctp_set_prsctp_policy(sp);
12405         }
12406 out_now:
12407         return (sp);
12408 }
12409
12410 int
12411 sctp_sosend(struct socket *so,
12412     struct sockaddr *addr,
12413     struct uio *uio,
12414     struct mbuf *top,
12415     struct mbuf *control,
12416     int flags,
12417     struct thread *p
12418 )
12419 {
12420         int error, use_sndinfo = 0;
12421         struct sctp_sndrcvinfo sndrcvninfo;
12422         struct sockaddr *addr_to_use;
12423 #if defined(INET) && defined(INET6)
12424         struct sockaddr_in sin;
12425 #endif
12426
12427         if (control) {
12428                 /* process cmsg snd/rcv info (maybe a assoc-id) */
12429                 if (sctp_find_cmsg(SCTP_SNDRCV, (void *)&sndrcvninfo, control,
12430                     sizeof(sndrcvninfo))) {
12431                         /* got one */
12432                         use_sndinfo = 1;
12433                 }
12434         }
12435         addr_to_use = addr;
12436 #if defined(INET) && defined(INET6)
12437         if ((addr != NULL) && (addr->sa_family == AF_INET6)) {
12438                 struct sockaddr_in6 *sin6;
12439
12440                 if (addr->sa_len != sizeof(struct sockaddr_in6)) {
12441                         SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12442                         return (EINVAL);
12443                 }
12444                 sin6 = (struct sockaddr_in6 *)addr;
12445                 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
12446                         in6_sin6_2_sin(&sin, sin6);
12447                         addr_to_use = (struct sockaddr *)&sin;
12448                 }
12449         }
12450 #endif
12451         error = sctp_lower_sosend(so, addr_to_use, uio, top,
12452             control,
12453             flags,
12454             use_sndinfo ? &sndrcvninfo : NULL
12455             ,p
12456             );
12457         return (error);
12458 }
12459
12460 int
12461 sctp_lower_sosend(struct socket *so,
12462     struct sockaddr *addr,
12463     struct uio *uio,
12464     struct mbuf *i_pak,
12465     struct mbuf *control,
12466     int flags,
12467     struct sctp_sndrcvinfo *srcv
12468     ,
12469     struct thread *p
12470 )
12471 {
12472         struct epoch_tracker et;
12473         ssize_t sndlen = 0, max_len, local_add_more;
12474         int error;
12475         struct mbuf *top = NULL;
12476         int queue_only = 0, queue_only_for_init = 0;
12477         int free_cnt_applied = 0;
12478         int un_sent;
12479         int now_filled = 0;
12480         unsigned int inqueue_bytes = 0;
12481         struct sctp_block_entry be;
12482         struct sctp_inpcb *inp;
12483         struct sctp_tcb *stcb = NULL;
12484         struct timeval now;
12485         struct sctp_nets *net;
12486         struct sctp_association *asoc;
12487         struct sctp_inpcb *t_inp;
12488         int user_marks_eor;
12489         int create_lock_applied = 0;
12490         int nagle_applies = 0;
12491         int some_on_control = 0;
12492         int got_all_of_the_send = 0;
12493         int hold_tcblock = 0;
12494         int non_blocking = 0;
12495         ssize_t local_soresv = 0;
12496         uint16_t port;
12497         uint16_t sinfo_flags;
12498         sctp_assoc_t sinfo_assoc_id;
12499
12500         error = 0;
12501         net = NULL;
12502         stcb = NULL;
12503         asoc = NULL;
12504
12505         t_inp = inp = (struct sctp_inpcb *)so->so_pcb;
12506         if (inp == NULL) {
12507                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12508                 error = EINVAL;
12509                 if (i_pak) {
12510                         SCTP_RELEASE_PKT(i_pak);
12511                 }
12512                 return (error);
12513         }
12514         if ((uio == NULL) && (i_pak == NULL)) {
12515                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12516                 return (EINVAL);
12517         }
12518         user_marks_eor = sctp_is_feature_on(inp, SCTP_PCB_FLAGS_EXPLICIT_EOR);
12519         atomic_add_int(&inp->total_sends, 1);
12520         if (uio) {
12521                 if (uio->uio_resid < 0) {
12522                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12523                         return (EINVAL);
12524                 }
12525                 sndlen = uio->uio_resid;
12526         } else {
12527                 top = SCTP_HEADER_TO_CHAIN(i_pak);
12528                 sndlen = SCTP_HEADER_LEN(i_pak);
12529         }
12530         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Send called addr:%p send length %zd\n",
12531             (void *)addr,
12532             sndlen);
12533         if ((inp->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) &&
12534             SCTP_IS_LISTENING(inp)) {
12535                 /* The listener can NOT send */
12536                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOTCONN);
12537                 error = ENOTCONN;
12538                 goto out_unlocked;
12539         }
12540         /**
12541          * Pre-screen address, if one is given the sin-len
12542          * must be set correctly!
12543          */
12544         if (addr) {
12545                 union sctp_sockstore *raddr = (union sctp_sockstore *)addr;
12546
12547                 switch (raddr->sa.sa_family) {
12548 #ifdef INET
12549                 case AF_INET:
12550                         if (raddr->sin.sin_len != sizeof(struct sockaddr_in)) {
12551                                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12552                                 error = EINVAL;
12553                                 goto out_unlocked;
12554                         }
12555                         port = raddr->sin.sin_port;
12556                         break;
12557 #endif
12558 #ifdef INET6
12559                 case AF_INET6:
12560                         if (raddr->sin6.sin6_len != sizeof(struct sockaddr_in6)) {
12561                                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12562                                 error = EINVAL;
12563                                 goto out_unlocked;
12564                         }
12565                         port = raddr->sin6.sin6_port;
12566                         break;
12567 #endif
12568                 default:
12569                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EAFNOSUPPORT);
12570                         error = EAFNOSUPPORT;
12571                         goto out_unlocked;
12572                 }
12573         } else
12574                 port = 0;
12575
12576         if (srcv) {
12577                 sinfo_flags = srcv->sinfo_flags;
12578                 sinfo_assoc_id = srcv->sinfo_assoc_id;
12579                 if (INVALID_SINFO_FLAG(sinfo_flags) ||
12580                     PR_SCTP_INVALID_POLICY(sinfo_flags)) {
12581                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12582                         error = EINVAL;
12583                         goto out_unlocked;
12584                 }
12585                 if (srcv->sinfo_flags)
12586                         SCTP_STAT_INCR(sctps_sends_with_flags);
12587         } else {
12588                 sinfo_flags = inp->def_send.sinfo_flags;
12589                 sinfo_assoc_id = inp->def_send.sinfo_assoc_id;
12590         }
12591         if (flags & MSG_EOR) {
12592                 sinfo_flags |= SCTP_EOR;
12593         }
12594         if (flags & MSG_EOF) {
12595                 sinfo_flags |= SCTP_EOF;
12596         }
12597         if (sinfo_flags & SCTP_SENDALL) {
12598                 /* its a sendall */
12599                 error = sctp_sendall(inp, uio, top, srcv);
12600                 top = NULL;
12601                 goto out_unlocked;
12602         }
12603         if ((sinfo_flags & SCTP_ADDR_OVER) && (addr == NULL)) {
12604                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12605                 error = EINVAL;
12606                 goto out_unlocked;
12607         }
12608         /* now we must find the assoc */
12609         if ((inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) ||
12610             (inp->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) {
12611                 SCTP_INP_RLOCK(inp);
12612                 stcb = LIST_FIRST(&inp->sctp_asoc_list);
12613                 if (stcb) {
12614                         SCTP_TCB_LOCK(stcb);
12615                         hold_tcblock = 1;
12616                 }
12617                 SCTP_INP_RUNLOCK(inp);
12618         } else if (sinfo_assoc_id) {
12619                 stcb = sctp_findassociation_ep_asocid(inp, sinfo_assoc_id, 1);
12620                 if (stcb != NULL) {
12621                         hold_tcblock = 1;
12622                 }
12623         } else if (addr) {
12624                 /*-
12625                  * Since we did not use findep we must
12626                  * increment it, and if we don't find a tcb
12627                  * decrement it.
12628                  */
12629                 SCTP_INP_WLOCK(inp);
12630                 SCTP_INP_INCR_REF(inp);
12631                 SCTP_INP_WUNLOCK(inp);
12632                 stcb = sctp_findassociation_ep_addr(&t_inp, addr, &net, NULL, NULL);
12633                 if (stcb == NULL) {
12634                         SCTP_INP_WLOCK(inp);
12635                         SCTP_INP_DECR_REF(inp);
12636                         SCTP_INP_WUNLOCK(inp);
12637                 } else {
12638                         hold_tcblock = 1;
12639                 }
12640         }
12641         if ((stcb == NULL) && (addr)) {
12642                 /* Possible implicit send? */
12643                 SCTP_ASOC_CREATE_LOCK(inp);
12644                 create_lock_applied = 1;
12645                 if ((inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) ||
12646                     (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE)) {
12647                         /* Should I really unlock ? */
12648                         SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12649                         error = EINVAL;
12650                         goto out_unlocked;
12651                 }
12652                 if (((inp->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) == 0) &&
12653                     (addr->sa_family == AF_INET6)) {
12654                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12655                         error = EINVAL;
12656                         goto out_unlocked;
12657                 }
12658                 SCTP_INP_WLOCK(inp);
12659                 SCTP_INP_INCR_REF(inp);
12660                 SCTP_INP_WUNLOCK(inp);
12661                 /* With the lock applied look again */
12662                 stcb = sctp_findassociation_ep_addr(&t_inp, addr, &net, NULL, NULL);
12663 #if defined(INET) || defined(INET6)
12664                 if ((stcb == NULL) && (control != NULL) && (port > 0)) {
12665                         stcb = sctp_findassociation_cmsgs(&t_inp, port, control, &net, &error);
12666                 }
12667 #endif
12668                 if (stcb == NULL) {
12669                         SCTP_INP_WLOCK(inp);
12670                         SCTP_INP_DECR_REF(inp);
12671                         SCTP_INP_WUNLOCK(inp);
12672                 } else {
12673                         hold_tcblock = 1;
12674                 }
12675                 if (error) {
12676                         goto out_unlocked;
12677                 }
12678                 if (t_inp != inp) {
12679                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOTCONN);
12680                         error = ENOTCONN;
12681                         goto out_unlocked;
12682                 }
12683         }
12684         if (stcb == NULL) {
12685                 if (addr == NULL) {
12686                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOENT);
12687                         error = ENOENT;
12688                         goto out_unlocked;
12689                 } else {
12690                         /* We must go ahead and start the INIT process */
12691                         uint32_t vrf_id;
12692
12693                         if ((sinfo_flags & SCTP_ABORT) ||
12694                             ((sinfo_flags & SCTP_EOF) && (sndlen == 0))) {
12695                                 /*-
12696                                  * User asks to abort a non-existant assoc,
12697                                  * or EOF a non-existant assoc with no data
12698                                  */
12699                                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOENT);
12700                                 error = ENOENT;
12701                                 goto out_unlocked;
12702                         }
12703                         /* get an asoc/stcb struct */
12704                         vrf_id = inp->def_vrf_id;
12705 #ifdef INVARIANTS
12706                         if (create_lock_applied == 0) {
12707                                 panic("Error, should hold create lock and I don't?");
12708                         }
12709 #endif
12710                         stcb = sctp_aloc_assoc(inp, addr, &error, 0, 0, vrf_id,
12711                             inp->sctp_ep.pre_open_stream_count,
12712                             inp->sctp_ep.port,
12713                             p,
12714                             SCTP_INITIALIZE_AUTH_PARAMS);
12715                         if (stcb == NULL) {
12716                                 /* Error is setup for us in the call */
12717                                 goto out_unlocked;
12718                         }
12719                         if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) {
12720                                 stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED;
12721                                 /*
12722                                  * Set the connected flag so we can queue
12723                                  * data
12724                                  */
12725                                 soisconnecting(so);
12726                         }
12727                         hold_tcblock = 1;
12728                         if (create_lock_applied) {
12729                                 SCTP_ASOC_CREATE_UNLOCK(inp);
12730                                 create_lock_applied = 0;
12731                         } else {
12732                                 SCTP_PRINTF("Huh-3? create lock should have been on??\n");
12733                         }
12734                         /*
12735                          * Turn on queue only flag to prevent data from
12736                          * being sent
12737                          */
12738                         queue_only = 1;
12739                         asoc = &stcb->asoc;
12740                         SCTP_SET_STATE(stcb, SCTP_STATE_COOKIE_WAIT);
12741                         (void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered);
12742
12743                         if (control) {
12744                                 if (sctp_process_cmsgs_for_init(stcb, control, &error)) {
12745                                         sctp_free_assoc(inp, stcb, SCTP_PCBFREE_FORCE,
12746                                             SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_6);
12747                                         hold_tcblock = 0;
12748                                         stcb = NULL;
12749                                         goto out_unlocked;
12750                                 }
12751                         }
12752                         /* out with the INIT */
12753                         queue_only_for_init = 1;
12754                         /*-
12755                          * we may want to dig in after this call and adjust the MTU
12756                          * value. It defaulted to 1500 (constant) but the ro
12757                          * structure may now have an update and thus we may need to
12758                          * change it BEFORE we append the message.
12759                          */
12760                 }
12761         } else
12762                 asoc = &stcb->asoc;
12763         if (srcv == NULL) {
12764                 srcv = (struct sctp_sndrcvinfo *)&asoc->def_send;
12765                 sinfo_flags = srcv->sinfo_flags;
12766                 if (flags & MSG_EOR) {
12767                         sinfo_flags |= SCTP_EOR;
12768                 }
12769                 if (flags & MSG_EOF) {
12770                         sinfo_flags |= SCTP_EOF;
12771                 }
12772         }
12773         if (sinfo_flags & SCTP_ADDR_OVER) {
12774                 if (addr)
12775                         net = sctp_findnet(stcb, addr);
12776                 else
12777                         net = NULL;
12778                 if ((net == NULL) ||
12779                     ((port != 0) && (port != stcb->rport))) {
12780                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12781                         error = EINVAL;
12782                         goto out_unlocked;
12783                 }
12784         } else {
12785                 if (stcb->asoc.alternate) {
12786                         net = stcb->asoc.alternate;
12787                 } else {
12788                         net = stcb->asoc.primary_destination;
12789                 }
12790         }
12791         atomic_add_int(&stcb->total_sends, 1);
12792         /* Keep the stcb from being freed under our feet */
12793         atomic_add_int(&asoc->refcnt, 1);
12794         free_cnt_applied = 1;
12795
12796         if (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_NO_FRAGMENT)) {
12797                 if (sndlen > (ssize_t)asoc->smallest_mtu) {
12798                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EMSGSIZE);
12799                         error = EMSGSIZE;
12800                         goto out_unlocked;
12801                 }
12802         }
12803         if (SCTP_SO_IS_NBIO(so)
12804             || (flags & (MSG_NBIO | MSG_DONTWAIT)) != 0
12805             ) {
12806                 non_blocking = 1;
12807         }
12808         /* would we block? */
12809         if (non_blocking) {
12810                 ssize_t amount;
12811
12812                 if (hold_tcblock == 0) {
12813                         SCTP_TCB_LOCK(stcb);
12814                         hold_tcblock = 1;
12815                 }
12816                 inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * SCTP_DATA_CHUNK_OVERHEAD(stcb));
12817                 if (user_marks_eor == 0) {
12818                         amount = sndlen;
12819                 } else {
12820                         amount = 1;
12821                 }
12822                 if ((SCTP_SB_LIMIT_SND(so) < (amount + inqueue_bytes + stcb->asoc.sb_send_resv)) ||
12823                     (stcb->asoc.chunks_on_out_queue >= SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue))) {
12824                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EWOULDBLOCK);
12825                         if (sndlen > (ssize_t)SCTP_SB_LIMIT_SND(so))
12826                                 error = EMSGSIZE;
12827                         else
12828                                 error = EWOULDBLOCK;
12829                         goto out_unlocked;
12830                 }
12831                 stcb->asoc.sb_send_resv += (uint32_t)sndlen;
12832                 SCTP_TCB_UNLOCK(stcb);
12833                 hold_tcblock = 0;
12834         } else {
12835                 atomic_add_int(&stcb->asoc.sb_send_resv, sndlen);
12836         }
12837         local_soresv = sndlen;
12838         if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
12839                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
12840                 error = ECONNRESET;
12841                 goto out_unlocked;
12842         }
12843         if (create_lock_applied) {
12844                 SCTP_ASOC_CREATE_UNLOCK(inp);
12845                 create_lock_applied = 0;
12846         }
12847         /* Is the stream no. valid? */
12848         if (srcv->sinfo_stream >= asoc->streamoutcnt) {
12849                 /* Invalid stream number */
12850                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12851                 error = EINVAL;
12852                 goto out_unlocked;
12853         }
12854         if ((asoc->strmout[srcv->sinfo_stream].state != SCTP_STREAM_OPEN) &&
12855             (asoc->strmout[srcv->sinfo_stream].state != SCTP_STREAM_OPENING)) {
12856                 /*
12857                  * Can't queue any data while stream reset is underway.
12858                  */
12859                 if (asoc->strmout[srcv->sinfo_stream].state > SCTP_STREAM_OPEN) {
12860                         error = EAGAIN;
12861                 } else {
12862                         error = EINVAL;
12863                 }
12864                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, error);
12865                 goto out_unlocked;
12866         }
12867         if ((SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_WAIT) ||
12868             (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)) {
12869                 queue_only = 1;
12870         }
12871         /* we are now done with all control */
12872         if (control) {
12873                 sctp_m_freem(control);
12874                 control = NULL;
12875         }
12876         if ((SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_SENT) ||
12877             (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_RECEIVED) ||
12878             (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_ACK_SENT) ||
12879             (asoc->state & SCTP_STATE_SHUTDOWN_PENDING)) {
12880                 if (sinfo_flags & SCTP_ABORT) {
12881                         ;
12882                 } else {
12883                         SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
12884                         error = ECONNRESET;
12885                         goto out_unlocked;
12886                 }
12887         }
12888         /* Ok, we will attempt a msgsnd :> */
12889         if (p) {
12890                 p->td_ru.ru_msgsnd++;
12891         }
12892         /* Are we aborting? */
12893         if (sinfo_flags & SCTP_ABORT) {
12894                 struct mbuf *mm;
12895                 ssize_t tot_demand, tot_out = 0, max_out;
12896
12897                 SCTP_STAT_INCR(sctps_sends_with_abort);
12898                 if ((SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_WAIT) ||
12899                     (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)) {
12900                         /* It has to be up before we abort */
12901                         /* how big is the user initiated abort? */
12902                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12903                         error = EINVAL;
12904                         goto out;
12905                 }
12906                 if (hold_tcblock) {
12907                         SCTP_TCB_UNLOCK(stcb);
12908                         hold_tcblock = 0;
12909                 }
12910                 if (top) {
12911                         struct mbuf *cntm = NULL;
12912
12913                         mm = sctp_get_mbuf_for_msg(sizeof(struct sctp_paramhdr), 0, M_WAITOK, 1, MT_DATA);
12914                         if (sndlen != 0) {
12915                                 for (cntm = top; cntm; cntm = SCTP_BUF_NEXT(cntm)) {
12916                                         tot_out += SCTP_BUF_LEN(cntm);
12917                                 }
12918                         }
12919                 } else {
12920                         /* Must fit in a MTU */
12921                         tot_out = sndlen;
12922                         tot_demand = (tot_out + sizeof(struct sctp_paramhdr));
12923                         if (tot_demand > SCTP_DEFAULT_ADD_MORE) {
12924                                 /* To big */
12925                                 SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EMSGSIZE);
12926                                 error = EMSGSIZE;
12927                                 goto out;
12928                         }
12929                         mm = sctp_get_mbuf_for_msg((unsigned int)tot_demand, 0, M_WAITOK, 1, MT_DATA);
12930                 }
12931                 if (mm == NULL) {
12932                         SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12933                         error = ENOMEM;
12934                         goto out;
12935                 }
12936                 max_out = asoc->smallest_mtu - sizeof(struct sctp_paramhdr);
12937                 max_out -= sizeof(struct sctp_abort_msg);
12938                 if (tot_out > max_out) {
12939                         tot_out = max_out;
12940                 }
12941                 if (mm) {
12942                         struct sctp_paramhdr *ph;
12943
12944                         /* now move forward the data pointer */
12945                         ph = mtod(mm, struct sctp_paramhdr *);
12946                         ph->param_type = htons(SCTP_CAUSE_USER_INITIATED_ABT);
12947                         ph->param_length = htons((uint16_t)(sizeof(struct sctp_paramhdr) + tot_out));
12948                         ph++;
12949                         SCTP_BUF_LEN(mm) = (int)(tot_out + sizeof(struct sctp_paramhdr));
12950                         if (top == NULL) {
12951                                 error = uiomove((caddr_t)ph, (int)tot_out, uio);
12952                                 if (error) {
12953                                         /*-
12954                                          * Here if we can't get his data we
12955                                          * still abort we just don't get to
12956                                          * send the users note :-0
12957                                          */
12958                                         sctp_m_freem(mm);
12959                                         mm = NULL;
12960                                 }
12961                         } else {
12962                                 if (sndlen != 0) {
12963                                         SCTP_BUF_NEXT(mm) = top;
12964                                 }
12965                         }
12966                 }
12967                 if (hold_tcblock == 0) {
12968                         SCTP_TCB_LOCK(stcb);
12969                 }
12970                 atomic_add_int(&stcb->asoc.refcnt, -1);
12971                 free_cnt_applied = 0;
12972                 /* release this lock, otherwise we hang on ourselves */
12973                 NET_EPOCH_ENTER(et);
12974                 sctp_abort_an_association(stcb->sctp_ep, stcb, mm, false, SCTP_SO_LOCKED);
12975                 NET_EPOCH_EXIT(et);
12976                 /* now relock the stcb so everything is sane */
12977                 hold_tcblock = 0;
12978                 stcb = NULL;
12979                 /*
12980                  * In this case top is already chained to mm avoid double
12981                  * free, since we free it below if top != NULL and driver
12982                  * would free it after sending the packet out
12983                  */
12984                 if (sndlen != 0) {
12985                         top = NULL;
12986                 }
12987                 goto out_unlocked;
12988         }
12989         /* Calculate the maximum we can send */
12990         inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * SCTP_DATA_CHUNK_OVERHEAD(stcb));
12991         if (SCTP_SB_LIMIT_SND(so) > inqueue_bytes) {
12992                 max_len = SCTP_SB_LIMIT_SND(so) - inqueue_bytes;
12993         } else {
12994                 max_len = 0;
12995         }
12996         if (hold_tcblock) {
12997                 SCTP_TCB_UNLOCK(stcb);
12998                 hold_tcblock = 0;
12999         }
13000         if (asoc->strmout == NULL) {
13001                 /* huh? software error */
13002                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EFAULT);
13003                 error = EFAULT;
13004                 goto out_unlocked;
13005         }
13006
13007         /* Unless E_EOR mode is on, we must make a send FIT in one call. */
13008         if ((user_marks_eor == 0) &&
13009             (sndlen > (ssize_t)SCTP_SB_LIMIT_SND(stcb->sctp_socket))) {
13010                 /* It will NEVER fit */
13011                 SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EMSGSIZE);
13012                 error = EMSGSIZE;
13013                 goto out_unlocked;
13014         }
13015         if ((uio == NULL) && user_marks_eor) {
13016                 /*-
13017                  * We do not support eeor mode for
13018                  * sending with mbuf chains (like sendfile).
13019                  */
13020                 SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
13021                 error = EINVAL;
13022                 goto out_unlocked;
13023         }
13024
13025         if (user_marks_eor) {
13026                 local_add_more = (ssize_t)min(SCTP_SB_LIMIT_SND(so), SCTP_BASE_SYSCTL(sctp_add_more_threshold));
13027         } else {
13028                 /*-
13029                  * For non-eeor the whole message must fit in
13030                  * the socket send buffer.
13031                  */
13032                 local_add_more = sndlen;
13033         }
13034         if (non_blocking) {
13035                 goto skip_preblock;
13036         }
13037         if (((max_len <= local_add_more) &&
13038             ((ssize_t)SCTP_SB_LIMIT_SND(so) >= local_add_more)) ||
13039             (max_len == 0) ||
13040             ((stcb->asoc.chunks_on_out_queue + stcb->asoc.stream_queue_cnt) >= SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue))) {
13041                 /* No room right now ! */
13042                 SOCKBUF_LOCK(&so->so_snd);
13043                 inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * SCTP_DATA_CHUNK_OVERHEAD(stcb));
13044                 while ((SCTP_SB_LIMIT_SND(so) < (inqueue_bytes + local_add_more)) ||
13045                     ((stcb->asoc.stream_queue_cnt + stcb->asoc.chunks_on_out_queue) >= SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue))) {
13046                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "pre_block limit:%u <(inq:%d + %zd) || (%d+%d > %d)\n",
13047                             (unsigned int)SCTP_SB_LIMIT_SND(so),
13048                             inqueue_bytes,
13049                             local_add_more,
13050                             stcb->asoc.stream_queue_cnt,
13051                             stcb->asoc.chunks_on_out_queue,
13052                             SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue));
13053                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13054                                 sctp_log_block(SCTP_BLOCK_LOG_INTO_BLKA, asoc, sndlen);
13055                         }
13056                         be.error = 0;
13057                         stcb->block_entry = &be;
13058                         error = sbwait(&so->so_snd);
13059                         stcb->block_entry = NULL;
13060                         if (error || so->so_error || be.error) {
13061                                 if (error == 0) {
13062                                         if (so->so_error)
13063                                                 error = so->so_error;
13064                                         if (be.error) {
13065                                                 error = be.error;
13066                                         }
13067                                 }
13068                                 SOCKBUF_UNLOCK(&so->so_snd);
13069                                 goto out_unlocked;
13070                         }
13071                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13072                                 sctp_log_block(SCTP_BLOCK_LOG_OUTOF_BLK,
13073                                     asoc, stcb->asoc.total_output_queue_size);
13074                         }
13075                         if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
13076                                 SOCKBUF_UNLOCK(&so->so_snd);
13077                                 goto out_unlocked;
13078                         }
13079                         inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * SCTP_DATA_CHUNK_OVERHEAD(stcb));
13080                 }
13081                 if (SCTP_SB_LIMIT_SND(so) > inqueue_bytes) {
13082                         max_len = SCTP_SB_LIMIT_SND(so) - inqueue_bytes;
13083                 } else {
13084                         max_len = 0;
13085                 }
13086                 SOCKBUF_UNLOCK(&so->so_snd);
13087         }
13088
13089 skip_preblock:
13090         if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
13091                 goto out_unlocked;
13092         }
13093         /*
13094          * sndlen covers for mbuf case uio_resid covers for the non-mbuf
13095          * case NOTE: uio will be null when top/mbuf is passed
13096          */
13097         if (sndlen == 0) {
13098                 if (sinfo_flags & SCTP_EOF) {
13099                         got_all_of_the_send = 1;
13100                         goto dataless_eof;
13101                 } else {
13102                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
13103                         error = EINVAL;
13104                         goto out;
13105                 }
13106         }
13107         if (top == NULL) {
13108                 struct sctp_stream_queue_pending *sp;
13109                 struct sctp_stream_out *strm;
13110                 uint32_t sndout;
13111
13112                 SCTP_TCB_SEND_LOCK(stcb);
13113                 if ((asoc->stream_locked) &&
13114                     (asoc->stream_locked_on != srcv->sinfo_stream)) {
13115                         SCTP_TCB_SEND_UNLOCK(stcb);
13116                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
13117                         error = EINVAL;
13118                         goto out;
13119                 }
13120                 strm = &stcb->asoc.strmout[srcv->sinfo_stream];
13121                 if (strm->last_msg_incomplete == 0) {
13122         do_a_copy_in:
13123                         SCTP_TCB_SEND_UNLOCK(stcb);
13124                         sp = sctp_copy_it_in(stcb, asoc, srcv, uio, net, max_len, user_marks_eor, &error);
13125                         if (error) {
13126                                 goto out;
13127                         }
13128                         SCTP_TCB_SEND_LOCK(stcb);
13129                         if (sp->msg_is_complete) {
13130                                 strm->last_msg_incomplete = 0;
13131                                 asoc->stream_locked = 0;
13132                         } else {
13133                                 /*
13134                                  * Just got locked to this guy in case of an
13135                                  * interrupt.
13136                                  */
13137                                 strm->last_msg_incomplete = 1;
13138                                 if (stcb->asoc.idata_supported == 0) {
13139                                         asoc->stream_locked = 1;
13140                                         asoc->stream_locked_on = srcv->sinfo_stream;
13141                                 }
13142                                 sp->sender_all_done = 0;
13143                         }
13144                         sctp_snd_sb_alloc(stcb, sp->length);
13145                         atomic_add_int(&asoc->stream_queue_cnt, 1);
13146                         if (sinfo_flags & SCTP_UNORDERED) {
13147                                 SCTP_STAT_INCR(sctps_sends_with_unord);
13148                         }
13149                         sp->processing = 1;
13150                         TAILQ_INSERT_TAIL(&strm->outqueue, sp, next);
13151                         stcb->asoc.ss_functions.sctp_ss_add_to_stream(stcb, asoc, strm, sp, 1);
13152                 } else {
13153                         sp = TAILQ_LAST(&strm->outqueue, sctp_streamhead);
13154                         if (sp == NULL) {
13155                                 /* ???? Huh ??? last msg is gone */
13156 #ifdef INVARIANTS
13157                                 panic("Warning: Last msg marked incomplete, yet nothing left?");
13158 #else
13159                                 SCTP_PRINTF("Warning: Last msg marked incomplete, yet nothing left?\n");
13160                                 strm->last_msg_incomplete = 0;
13161 #endif
13162                                 goto do_a_copy_in;
13163                         }
13164                         if (sp->processing) {
13165                                 SCTP_TCB_SEND_UNLOCK(stcb);
13166                                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
13167                                 error = EINVAL;
13168                                 goto out;
13169                         } else {
13170                                 sp->processing = 1;
13171                         }
13172                 }
13173                 SCTP_TCB_SEND_UNLOCK(stcb);
13174                 while (uio->uio_resid > 0) {
13175                         /* How much room do we have? */
13176                         struct mbuf *new_tail, *mm;
13177
13178                         inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * SCTP_DATA_CHUNK_OVERHEAD(stcb));
13179                         if (SCTP_SB_LIMIT_SND(so) > inqueue_bytes)
13180                                 max_len = SCTP_SB_LIMIT_SND(so) - inqueue_bytes;
13181                         else
13182                                 max_len = 0;
13183
13184                         if ((max_len > (ssize_t)SCTP_BASE_SYSCTL(sctp_add_more_threshold)) ||
13185                             (max_len && (SCTP_SB_LIMIT_SND(so) < SCTP_BASE_SYSCTL(sctp_add_more_threshold))) ||
13186                             (uio->uio_resid && (uio->uio_resid <= max_len))) {
13187                                 sndout = 0;
13188                                 new_tail = NULL;
13189                                 if (hold_tcblock) {
13190                                         SCTP_TCB_UNLOCK(stcb);
13191                                         hold_tcblock = 0;
13192                                 }
13193                                 mm = sctp_copy_resume(uio, (int)max_len, user_marks_eor, &error, &sndout, &new_tail);
13194                                 if ((mm == NULL) || error) {
13195                                         if (mm) {
13196                                                 sctp_m_freem(mm);
13197                                         }
13198                                         SCTP_TCB_SEND_LOCK(stcb);
13199                                         if (((stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) == 0) &&
13200                                             ((stcb->asoc.state & SCTP_STATE_WAS_ABORTED) == 0) &&
13201                                             (sp != NULL)) {
13202                                                 sp->processing = 0;
13203                                         }
13204                                         SCTP_TCB_SEND_UNLOCK(stcb);
13205                                         goto out;
13206                                 }
13207                                 /* Update the mbuf and count */
13208                                 SCTP_TCB_SEND_LOCK(stcb);
13209                                 if ((stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) ||
13210                                     (stcb->asoc.state & SCTP_STATE_WAS_ABORTED)) {
13211                                         /*
13212                                          * we need to get out. Peer probably
13213                                          * aborted.
13214                                          */
13215                                         sctp_m_freem(mm);
13216                                         if (stcb->asoc.state & SCTP_STATE_WAS_ABORTED) {
13217                                                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
13218                                                 error = ECONNRESET;
13219                                         }
13220                                         SCTP_TCB_SEND_UNLOCK(stcb);
13221                                         goto out;
13222                                 }
13223                                 if (sp->tail_mbuf) {
13224                                         /* tack it to the end */
13225                                         SCTP_BUF_NEXT(sp->tail_mbuf) = mm;
13226                                         sp->tail_mbuf = new_tail;
13227                                 } else {
13228                                         /* A stolen mbuf */
13229                                         sp->data = mm;
13230                                         sp->tail_mbuf = new_tail;
13231                                 }
13232                                 sctp_snd_sb_alloc(stcb, sndout);
13233                                 atomic_add_int(&sp->length, sndout);
13234                                 if (sinfo_flags & SCTP_SACK_IMMEDIATELY) {
13235                                         sp->sinfo_flags |= SCTP_SACK_IMMEDIATELY;
13236                                 }
13237
13238                                 /* Did we reach EOR? */
13239                                 if ((uio->uio_resid == 0) &&
13240                                     ((user_marks_eor == 0) ||
13241                                     (sinfo_flags & SCTP_EOF) ||
13242                                     (user_marks_eor && (sinfo_flags & SCTP_EOR)))) {
13243                                         sp->msg_is_complete = 1;
13244                                 } else {
13245                                         sp->msg_is_complete = 0;
13246                                 }
13247                                 SCTP_TCB_SEND_UNLOCK(stcb);
13248                         }
13249                         if (uio->uio_resid == 0) {
13250                                 /* got it all? */
13251                                 continue;
13252                         }
13253                         /* PR-SCTP? */
13254                         if ((asoc->prsctp_supported) && (asoc->sent_queue_cnt_removeable > 0)) {
13255                                 /*
13256                                  * This is ugly but we must assure locking
13257                                  * order
13258                                  */
13259                                 if (hold_tcblock == 0) {
13260                                         SCTP_TCB_LOCK(stcb);
13261                                         hold_tcblock = 1;
13262                                 }
13263                                 sctp_prune_prsctp(stcb, asoc, srcv, (int)sndlen);
13264                                 inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * SCTP_DATA_CHUNK_OVERHEAD(stcb));
13265                                 if (SCTP_SB_LIMIT_SND(so) > inqueue_bytes)
13266                                         max_len = SCTP_SB_LIMIT_SND(so) - inqueue_bytes;
13267                                 else
13268                                         max_len = 0;
13269                                 if (max_len > 0) {
13270                                         continue;
13271                                 }
13272                                 SCTP_TCB_UNLOCK(stcb);
13273                                 hold_tcblock = 0;
13274                         }
13275                         /* wait for space now */
13276                         if (non_blocking) {
13277                                 /* Non-blocking io in place out */
13278                                 SCTP_TCB_SEND_LOCK(stcb);
13279                                 if (sp != NULL) {
13280                                         sp->processing = 0;
13281                                 }
13282                                 SCTP_TCB_SEND_UNLOCK(stcb);
13283                                 goto skip_out_eof;
13284                         }
13285                         /* What about the INIT, send it maybe */
13286                         if (queue_only_for_init) {
13287                                 if (hold_tcblock == 0) {
13288                                         SCTP_TCB_LOCK(stcb);
13289                                         hold_tcblock = 1;
13290                                 }
13291                                 if (SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) {
13292                                         /* a collision took us forward? */
13293                                         queue_only = 0;
13294                                 } else {
13295                                         NET_EPOCH_ENTER(et);
13296                                         sctp_send_initiate(inp, stcb, SCTP_SO_LOCKED);
13297                                         NET_EPOCH_EXIT(et);
13298                                         SCTP_SET_STATE(stcb, SCTP_STATE_COOKIE_WAIT);
13299                                         queue_only = 1;
13300                                 }
13301                         }
13302                         if ((net->flight_size > net->cwnd) &&
13303                             (asoc->sctp_cmt_on_off == 0)) {
13304                                 SCTP_STAT_INCR(sctps_send_cwnd_avoid);
13305                                 queue_only = 1;
13306                         } else if (asoc->ifp_had_enobuf) {
13307                                 SCTP_STAT_INCR(sctps_ifnomemqueued);
13308                                 if (net->flight_size > (2 * net->mtu)) {
13309                                         queue_only = 1;
13310                                 }
13311                                 asoc->ifp_had_enobuf = 0;
13312                         }
13313                         un_sent = stcb->asoc.total_output_queue_size - stcb->asoc.total_flight;
13314                         if ((sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY)) &&
13315                             (stcb->asoc.total_flight > 0) &&
13316                             (stcb->asoc.stream_queue_cnt < SCTP_MAX_DATA_BUNDLING) &&
13317                             (un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD))) {
13318                                 /*-
13319                                  * Ok, Nagle is set on and we have data outstanding.
13320                                  * Don't send anything and let SACKs drive out the
13321                                  * data unless we have a "full" segment to send.
13322                                  */
13323                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
13324                                         sctp_log_nagle_event(stcb, SCTP_NAGLE_APPLIED);
13325                                 }
13326                                 SCTP_STAT_INCR(sctps_naglequeued);
13327                                 nagle_applies = 1;
13328                         } else {
13329                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
13330                                         if (sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY))
13331                                                 sctp_log_nagle_event(stcb, SCTP_NAGLE_SKIPPED);
13332                                 }
13333                                 SCTP_STAT_INCR(sctps_naglesent);
13334                                 nagle_applies = 0;
13335                         }
13336                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13337                                 sctp_misc_ints(SCTP_CWNDLOG_PRESEND, queue_only_for_init, queue_only,
13338                                     nagle_applies, un_sent);
13339                                 sctp_misc_ints(SCTP_CWNDLOG_PRESEND, stcb->asoc.total_output_queue_size,
13340                                     stcb->asoc.total_flight,
13341                                     stcb->asoc.chunks_on_out_queue, stcb->asoc.total_flight_count);
13342                         }
13343                         if (queue_only_for_init)
13344                                 queue_only_for_init = 0;
13345                         if ((queue_only == 0) && (nagle_applies == 0)) {
13346                                 /*-
13347                                  * need to start chunk output
13348                                  * before blocking.. note that if
13349                                  * a lock is already applied, then
13350                                  * the input via the net is happening
13351                                  * and I don't need to start output :-D
13352                                  */
13353                                 NET_EPOCH_ENTER(et);
13354                                 if (hold_tcblock == 0) {
13355                                         if (SCTP_TCB_TRYLOCK(stcb)) {
13356                                                 hold_tcblock = 1;
13357                                                 sctp_chunk_output(inp,
13358                                                     stcb,
13359                                                     SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13360                                         }
13361                                 } else {
13362                                         sctp_chunk_output(inp,
13363                                             stcb,
13364                                             SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13365                                 }
13366                                 NET_EPOCH_EXIT(et);
13367                         }
13368                         if (hold_tcblock == 1) {
13369                                 SCTP_TCB_UNLOCK(stcb);
13370                                 hold_tcblock = 0;
13371                         }
13372                         SOCKBUF_LOCK(&so->so_snd);
13373                         /*-
13374                          * This is a bit strange, but I think it will
13375                          * work. The total_output_queue_size is locked and
13376                          * protected by the TCB_LOCK, which we just released.
13377                          * There is a race that can occur between releasing it
13378                          * above, and me getting the socket lock, where sacks
13379                          * come in but we have not put the SB_WAIT on the
13380                          * so_snd buffer to get the wakeup. After the LOCK
13381                          * is applied the sack_processing will also need to
13382                          * LOCK the so->so_snd to do the actual sowwakeup(). So
13383                          * once we have the socket buffer lock if we recheck the
13384                          * size we KNOW we will get to sleep safely with the
13385                          * wakeup flag in place.
13386                          */
13387                         inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * SCTP_DATA_CHUNK_OVERHEAD(stcb));
13388                         if (SCTP_SB_LIMIT_SND(so) <= (inqueue_bytes +
13389                             min(SCTP_BASE_SYSCTL(sctp_add_more_threshold), SCTP_SB_LIMIT_SND(so)))) {
13390                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13391                                         sctp_log_block(SCTP_BLOCK_LOG_INTO_BLK,
13392                                             asoc, uio->uio_resid);
13393                                 }
13394                                 be.error = 0;
13395                                 stcb->block_entry = &be;
13396                                 error = sbwait(&so->so_snd);
13397                                 stcb->block_entry = NULL;
13398
13399                                 if (error || so->so_error || be.error) {
13400                                         if (error == 0) {
13401                                                 if (so->so_error)
13402                                                         error = so->so_error;
13403                                                 if (be.error) {
13404                                                         error = be.error;
13405                                                 }
13406                                         }
13407                                         SOCKBUF_UNLOCK(&so->so_snd);
13408                                         SCTP_TCB_SEND_LOCK(stcb);
13409                                         if (((stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) == 0) &&
13410                                             ((stcb->asoc.state & SCTP_STATE_WAS_ABORTED) == 0) &&
13411                                             (sp != NULL)) {
13412                                                 sp->processing = 0;
13413                                         }
13414                                         SCTP_TCB_SEND_UNLOCK(stcb);
13415                                         goto out_unlocked;
13416                                 }
13417
13418                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13419                                         sctp_log_block(SCTP_BLOCK_LOG_OUTOF_BLK,
13420                                             asoc, stcb->asoc.total_output_queue_size);
13421                                 }
13422                         }
13423                         SOCKBUF_UNLOCK(&so->so_snd);
13424                         SCTP_TCB_SEND_LOCK(stcb);
13425                         if ((stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) ||
13426                             (stcb->asoc.state & SCTP_STATE_WAS_ABORTED)) {
13427                                 SCTP_TCB_SEND_UNLOCK(stcb);
13428                                 goto out_unlocked;
13429                         }
13430                         SCTP_TCB_SEND_UNLOCK(stcb);
13431                 }
13432                 SCTP_TCB_SEND_LOCK(stcb);
13433                 if ((stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) ||
13434                     (stcb->asoc.state & SCTP_STATE_WAS_ABORTED)) {
13435                         SCTP_TCB_SEND_UNLOCK(stcb);
13436                         goto out_unlocked;
13437                 }
13438                 if (sp) {
13439                         if (sp->msg_is_complete == 0) {
13440                                 strm->last_msg_incomplete = 1;
13441                                 if (stcb->asoc.idata_supported == 0) {
13442                                         asoc->stream_locked = 1;
13443                                         asoc->stream_locked_on = srcv->sinfo_stream;
13444                                 }
13445                         } else {
13446                                 sp->sender_all_done = 1;
13447                                 strm->last_msg_incomplete = 0;
13448                                 asoc->stream_locked = 0;
13449                         }
13450                         sp->processing = 0;
13451                 } else {
13452                         SCTP_PRINTF("Huh no sp TSNH?\n");
13453                         strm->last_msg_incomplete = 0;
13454                         asoc->stream_locked = 0;
13455                 }
13456                 SCTP_TCB_SEND_UNLOCK(stcb);
13457                 if (uio->uio_resid == 0) {
13458                         got_all_of_the_send = 1;
13459                 }
13460         } else {
13461                 /* We send in a 0, since we do NOT have any locks */
13462                 error = sctp_msg_append(stcb, net, top, srcv, 0);
13463                 top = NULL;
13464                 if (sinfo_flags & SCTP_EOF) {
13465                         got_all_of_the_send = 1;
13466                 }
13467         }
13468         if (error) {
13469                 goto out;
13470         }
13471 dataless_eof:
13472         /* EOF thing ? */
13473         if ((sinfo_flags & SCTP_EOF) &&
13474             (got_all_of_the_send == 1)) {
13475                 SCTP_STAT_INCR(sctps_sends_with_eof);
13476                 error = 0;
13477                 if (hold_tcblock == 0) {
13478                         SCTP_TCB_LOCK(stcb);
13479                         hold_tcblock = 1;
13480                 }
13481                 if (TAILQ_EMPTY(&asoc->send_queue) &&
13482                     TAILQ_EMPTY(&asoc->sent_queue) &&
13483                     sctp_is_there_unsent_data(stcb, SCTP_SO_LOCKED) == 0) {
13484                         if ((*asoc->ss_functions.sctp_ss_is_user_msgs_incomplete) (stcb, asoc)) {
13485                                 goto abort_anyway;
13486                         }
13487                         /* there is nothing queued to send, so I'm done... */
13488                         if ((SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_SENT) &&
13489                             (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
13490                             (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
13491                                 struct sctp_nets *netp;
13492
13493                                 /* only send SHUTDOWN the first time through */
13494                                 if (SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) {
13495                                         SCTP_STAT_DECR_GAUGE32(sctps_currestab);
13496                                 }
13497                                 SCTP_SET_STATE(stcb, SCTP_STATE_SHUTDOWN_SENT);
13498                                 sctp_stop_timers_for_shutdown(stcb);
13499                                 if (stcb->asoc.alternate) {
13500                                         netp = stcb->asoc.alternate;
13501                                 } else {
13502                                         netp = stcb->asoc.primary_destination;
13503                                 }
13504                                 sctp_send_shutdown(stcb, netp);
13505                                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb,
13506                                     netp);
13507                                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
13508                                     NULL);
13509                         }
13510                 } else {
13511                         /*-
13512                          * we still got (or just got) data to send, so set
13513                          * SHUTDOWN_PENDING
13514                          */
13515                         /*-
13516                          * XXX sockets draft says that SCTP_EOF should be
13517                          * sent with no data.  currently, we will allow user
13518                          * data to be sent first and move to
13519                          * SHUTDOWN-PENDING
13520                          */
13521                         if ((SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_SENT) &&
13522                             (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
13523                             (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
13524                                 if (hold_tcblock == 0) {
13525                                         SCTP_TCB_LOCK(stcb);
13526                                         hold_tcblock = 1;
13527                                 }
13528                                 if ((*asoc->ss_functions.sctp_ss_is_user_msgs_incomplete) (stcb, asoc)) {
13529                                         SCTP_ADD_SUBSTATE(stcb, SCTP_STATE_PARTIAL_MSG_LEFT);
13530                                 }
13531                                 SCTP_ADD_SUBSTATE(stcb, SCTP_STATE_SHUTDOWN_PENDING);
13532                                 if (TAILQ_EMPTY(&asoc->send_queue) &&
13533                                     TAILQ_EMPTY(&asoc->sent_queue) &&
13534                                     (asoc->state & SCTP_STATE_PARTIAL_MSG_LEFT)) {
13535                                         struct mbuf *op_err;
13536                                         char msg[SCTP_DIAG_INFO_LEN];
13537
13538                         abort_anyway:
13539                                         if (free_cnt_applied) {
13540                                                 atomic_add_int(&stcb->asoc.refcnt, -1);
13541                                                 free_cnt_applied = 0;
13542                                         }
13543                                         SCTP_SNPRINTF(msg, sizeof(msg),
13544                                             "%s:%d at %s", __FILE__, __LINE__, __func__);
13545                                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
13546                                             msg);
13547                                         NET_EPOCH_ENTER(et);
13548                                         sctp_abort_an_association(stcb->sctp_ep, stcb,
13549                                             op_err, false, SCTP_SO_LOCKED);
13550                                         NET_EPOCH_EXIT(et);
13551                                         /*
13552                                          * now relock the stcb so everything
13553                                          * is sane
13554                                          */
13555                                         hold_tcblock = 0;
13556                                         stcb = NULL;
13557                                         goto out;
13558                                 }
13559                                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
13560                                     NULL);
13561                                 sctp_feature_off(inp, SCTP_PCB_FLAGS_NODELAY);
13562                         }
13563                 }
13564         }
13565 skip_out_eof:
13566         if (!TAILQ_EMPTY(&stcb->asoc.control_send_queue)) {
13567                 some_on_control = 1;
13568         }
13569         if (queue_only_for_init) {
13570                 if (hold_tcblock == 0) {
13571                         SCTP_TCB_LOCK(stcb);
13572                         hold_tcblock = 1;
13573                 }
13574                 if (SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) {
13575                         /* a collision took us forward? */
13576                         queue_only = 0;
13577                 } else {
13578                         NET_EPOCH_ENTER(et);
13579                         sctp_send_initiate(inp, stcb, SCTP_SO_LOCKED);
13580                         NET_EPOCH_EXIT(et);
13581                         SCTP_SET_STATE(stcb, SCTP_STATE_COOKIE_WAIT);
13582                         queue_only = 1;
13583                 }
13584         }
13585         if ((net->flight_size > net->cwnd) &&
13586             (stcb->asoc.sctp_cmt_on_off == 0)) {
13587                 SCTP_STAT_INCR(sctps_send_cwnd_avoid);
13588                 queue_only = 1;
13589         } else if (asoc->ifp_had_enobuf) {
13590                 SCTP_STAT_INCR(sctps_ifnomemqueued);
13591                 if (net->flight_size > (2 * net->mtu)) {
13592                         queue_only = 1;
13593                 }
13594                 asoc->ifp_had_enobuf = 0;
13595         }
13596         un_sent = stcb->asoc.total_output_queue_size - stcb->asoc.total_flight;
13597         if ((sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY)) &&
13598             (stcb->asoc.total_flight > 0) &&
13599             (stcb->asoc.stream_queue_cnt < SCTP_MAX_DATA_BUNDLING) &&
13600             (un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD))) {
13601                 /*-
13602                  * Ok, Nagle is set on and we have data outstanding.
13603                  * Don't send anything and let SACKs drive out the
13604                  * data unless wen have a "full" segment to send.
13605                  */
13606                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
13607                         sctp_log_nagle_event(stcb, SCTP_NAGLE_APPLIED);
13608                 }
13609                 SCTP_STAT_INCR(sctps_naglequeued);
13610                 nagle_applies = 1;
13611         } else {
13612                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
13613                         if (sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY))
13614                                 sctp_log_nagle_event(stcb, SCTP_NAGLE_SKIPPED);
13615                 }
13616                 SCTP_STAT_INCR(sctps_naglesent);
13617                 nagle_applies = 0;
13618         }
13619         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13620                 sctp_misc_ints(SCTP_CWNDLOG_PRESEND, queue_only_for_init, queue_only,
13621                     nagle_applies, un_sent);
13622                 sctp_misc_ints(SCTP_CWNDLOG_PRESEND, stcb->asoc.total_output_queue_size,
13623                     stcb->asoc.total_flight,
13624                     stcb->asoc.chunks_on_out_queue, stcb->asoc.total_flight_count);
13625         }
13626         NET_EPOCH_ENTER(et);
13627         if ((queue_only == 0) && (nagle_applies == 0) && (stcb->asoc.peers_rwnd && un_sent)) {
13628                 /* we can attempt to send too. */
13629                 if (hold_tcblock == 0) {
13630                         /*
13631                          * If there is activity recv'ing sacks no need to
13632                          * send
13633                          */
13634                         if (SCTP_TCB_TRYLOCK(stcb)) {
13635                                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13636                                 hold_tcblock = 1;
13637                         }
13638                 } else {
13639                         sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13640                 }
13641         } else if ((queue_only == 0) &&
13642                     (stcb->asoc.peers_rwnd == 0) &&
13643             (stcb->asoc.total_flight == 0)) {
13644                 /* We get to have a probe outstanding */
13645                 if (hold_tcblock == 0) {
13646                         hold_tcblock = 1;
13647                         SCTP_TCB_LOCK(stcb);
13648                 }
13649                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13650         } else if (some_on_control) {
13651                 int num_out, reason, frag_point;
13652
13653                 /* Here we do control only */
13654                 if (hold_tcblock == 0) {
13655                         hold_tcblock = 1;
13656                         SCTP_TCB_LOCK(stcb);
13657                 }
13658                 frag_point = sctp_get_frag_point(stcb, &stcb->asoc);
13659                 (void)sctp_med_chunk_output(inp, stcb, &stcb->asoc, &num_out,
13660                     &reason, 1, 1, &now, &now_filled, frag_point, SCTP_SO_LOCKED);
13661         }
13662         NET_EPOCH_EXIT(et);
13663         SCTPDBG(SCTP_DEBUG_OUTPUT1, "USR Send complete qo:%d prw:%d unsent:%d tf:%d cooq:%d toqs:%d err:%d\n",
13664             queue_only, stcb->asoc.peers_rwnd, un_sent,
13665             stcb->asoc.total_flight, stcb->asoc.chunks_on_out_queue,
13666             stcb->asoc.total_output_queue_size, error);
13667
13668 out:
13669 out_unlocked:
13670
13671         if (local_soresv && stcb) {
13672                 atomic_subtract_int(&stcb->asoc.sb_send_resv, sndlen);
13673         }
13674         if (create_lock_applied) {
13675                 SCTP_ASOC_CREATE_UNLOCK(inp);
13676         }
13677         if ((stcb) && hold_tcblock) {
13678                 SCTP_TCB_UNLOCK(stcb);
13679         }
13680         if (stcb && free_cnt_applied) {
13681                 atomic_add_int(&stcb->asoc.refcnt, -1);
13682         }
13683 #ifdef INVARIANTS
13684         if (stcb) {
13685                 if (mtx_owned(&stcb->tcb_mtx)) {
13686                         panic("Leaving with tcb mtx owned?");
13687                 }
13688                 if (mtx_owned(&stcb->tcb_send_mtx)) {
13689                         panic("Leaving with tcb send mtx owned?");
13690                 }
13691         }
13692 #endif
13693         if (top) {
13694                 sctp_m_freem(top);
13695         }
13696         if (control) {
13697                 sctp_m_freem(control);
13698         }
13699         return (error);
13700 }
13701
13702 /*
13703  * generate an AUTHentication chunk, if required
13704  */
13705 struct mbuf *
13706 sctp_add_auth_chunk(struct mbuf *m, struct mbuf **m_end,
13707     struct sctp_auth_chunk **auth_ret, uint32_t *offset,
13708     struct sctp_tcb *stcb, uint8_t chunk)
13709 {
13710         struct mbuf *m_auth;
13711         struct sctp_auth_chunk *auth;
13712         int chunk_len;
13713         struct mbuf *cn;
13714
13715         if ((m_end == NULL) || (auth_ret == NULL) || (offset == NULL) ||
13716             (stcb == NULL))
13717                 return (m);
13718
13719         if (stcb->asoc.auth_supported == 0) {
13720                 return (m);
13721         }
13722         /* does the requested chunk require auth? */
13723         if (!sctp_auth_is_required_chunk(chunk, stcb->asoc.peer_auth_chunks)) {
13724                 return (m);
13725         }
13726         m_auth = sctp_get_mbuf_for_msg(sizeof(*auth), 0, M_NOWAIT, 1, MT_HEADER);
13727         if (m_auth == NULL) {
13728                 /* no mbuf's */
13729                 return (m);
13730         }
13731         /* reserve some space if this will be the first mbuf */
13732         if (m == NULL)
13733                 SCTP_BUF_RESV_UF(m_auth, SCTP_MIN_OVERHEAD);
13734         /* fill in the AUTH chunk details */
13735         auth = mtod(m_auth, struct sctp_auth_chunk *);
13736         memset(auth, 0, sizeof(*auth));
13737         auth->ch.chunk_type = SCTP_AUTHENTICATION;
13738         auth->ch.chunk_flags = 0;
13739         chunk_len = sizeof(*auth) +
13740             sctp_get_hmac_digest_len(stcb->asoc.peer_hmac_id);
13741         auth->ch.chunk_length = htons(chunk_len);
13742         auth->hmac_id = htons(stcb->asoc.peer_hmac_id);
13743         /* key id and hmac digest will be computed and filled in upon send */
13744
13745         /* save the offset where the auth was inserted into the chain */
13746         *offset = 0;
13747         for (cn = m; cn; cn = SCTP_BUF_NEXT(cn)) {
13748                 *offset += SCTP_BUF_LEN(cn);
13749         }
13750
13751         /* update length and return pointer to the auth chunk */
13752         SCTP_BUF_LEN(m_auth) = chunk_len;
13753         m = sctp_copy_mbufchain(m_auth, m, m_end, 1, chunk_len, 0);
13754         if (auth_ret != NULL)
13755                 *auth_ret = auth;
13756
13757         return (m);
13758 }
13759
13760 #ifdef INET6
13761 int
13762 sctp_v6src_match_nexthop(struct sockaddr_in6 *src6, sctp_route_t *ro)
13763 {
13764         struct nd_prefix *pfx = NULL;
13765         struct nd_pfxrouter *pfxrtr = NULL;
13766         struct sockaddr_in6 gw6;
13767
13768         if (ro == NULL || ro->ro_nh == NULL || src6->sin6_family != AF_INET6)
13769                 return (0);
13770
13771         /* get prefix entry of address */
13772         ND6_RLOCK();
13773         LIST_FOREACH(pfx, &MODULE_GLOBAL(nd_prefix), ndpr_entry) {
13774                 if (pfx->ndpr_stateflags & NDPRF_DETACHED)
13775                         continue;
13776                 if (IN6_ARE_MASKED_ADDR_EQUAL(&pfx->ndpr_prefix.sin6_addr,
13777                     &src6->sin6_addr, &pfx->ndpr_mask))
13778                         break;
13779         }
13780         /* no prefix entry in the prefix list */
13781         if (pfx == NULL) {
13782                 ND6_RUNLOCK();
13783                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "No prefix entry for ");
13784                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)src6);
13785                 return (0);
13786         }
13787
13788         SCTPDBG(SCTP_DEBUG_OUTPUT2, "v6src_match_nexthop(), Prefix entry is ");
13789         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)src6);
13790
13791         /* search installed gateway from prefix entry */
13792         LIST_FOREACH(pfxrtr, &pfx->ndpr_advrtrs, pfr_entry) {
13793                 memset(&gw6, 0, sizeof(struct sockaddr_in6));
13794                 gw6.sin6_family = AF_INET6;
13795                 gw6.sin6_len = sizeof(struct sockaddr_in6);
13796                 memcpy(&gw6.sin6_addr, &pfxrtr->router->rtaddr,
13797                     sizeof(struct in6_addr));
13798                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "prefix router is ");
13799                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)&gw6);
13800                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "installed router is ");
13801                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, &ro->ro_nh->gw_sa);
13802                 if (sctp_cmpaddr((struct sockaddr *)&gw6, &ro->ro_nh->gw_sa)) {
13803                         ND6_RUNLOCK();
13804                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "pfxrouter is installed\n");
13805                         return (1);
13806                 }
13807         }
13808         ND6_RUNLOCK();
13809         SCTPDBG(SCTP_DEBUG_OUTPUT2, "pfxrouter is not installed\n");
13810         return (0);
13811 }
13812 #endif
13813
13814 int
13815 sctp_v4src_match_nexthop(struct sctp_ifa *sifa, sctp_route_t *ro)
13816 {
13817 #ifdef INET
13818         struct sockaddr_in *sin, *mask;
13819         struct ifaddr *ifa;
13820         struct in_addr srcnetaddr, gwnetaddr;
13821
13822         if (ro == NULL || ro->ro_nh == NULL ||
13823             sifa->address.sa.sa_family != AF_INET) {
13824                 return (0);
13825         }
13826         ifa = (struct ifaddr *)sifa->ifa;
13827         mask = (struct sockaddr_in *)(ifa->ifa_netmask);
13828         sin = &sifa->address.sin;
13829         srcnetaddr.s_addr = (sin->sin_addr.s_addr & mask->sin_addr.s_addr);
13830         SCTPDBG(SCTP_DEBUG_OUTPUT1, "match_nexthop4: src address is ");
13831         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, &sifa->address.sa);
13832         SCTPDBG(SCTP_DEBUG_OUTPUT1, "network address is %x\n", srcnetaddr.s_addr);
13833
13834         sin = &ro->ro_nh->gw4_sa;
13835         gwnetaddr.s_addr = (sin->sin_addr.s_addr & mask->sin_addr.s_addr);
13836         SCTPDBG(SCTP_DEBUG_OUTPUT1, "match_nexthop4: nexthop is ");
13837         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, &ro->ro_nh->gw_sa);
13838         SCTPDBG(SCTP_DEBUG_OUTPUT1, "network address is %x\n", gwnetaddr.s_addr);
13839         if (srcnetaddr.s_addr == gwnetaddr.s_addr) {
13840                 return (1);
13841         }
13842 #endif
13843         return (0);
13844 }