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 unspecified 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          * Caveats 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, inp, 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                                                         net->mtu = mtu;
4248                                                         if ((stcb != NULL) && (stcb->asoc.smallest_mtu > mtu)) {
4249                                                                 sctp_pathmtu_adjustment(stcb, mtu, true);
4250                                                         }
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, inp, 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                                                         net->mtu = mtu;
4590                                                         if ((stcb != NULL) && (stcb->asoc.smallest_mtu > mtu)) {
4591                                                                 sctp_pathmtu_adjustment(stcb, mtu, false);
4592                                                         }
4593                                                 }
4594                                         }
4595                                 } else if (ifp != NULL) {
4596                                         if ((ND_IFINFO(ifp)->linkmtu > 0) &&
4597                                             (stcb->asoc.smallest_mtu > ND_IFINFO(ifp)->linkmtu)) {
4598                                                 sctp_pathmtu_adjustment(stcb, ND_IFINFO(ifp)->linkmtu, false);
4599                                         }
4600                                 }
4601                         }
4602                         return (ret);
4603                 }
4604 #endif
4605         default:
4606                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Unknown protocol (TSNH) type %d\n",
4607                     ((struct sockaddr *)to)->sa_family);
4608                 sctp_m_freem(m);
4609                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EFAULT);
4610                 return (EFAULT);
4611         }
4612 }
4613
4614 void
4615 sctp_send_initiate(struct sctp_inpcb *inp, struct sctp_tcb *stcb, int so_locked)
4616 {
4617         struct mbuf *m, *m_last;
4618         struct sctp_nets *net;
4619         struct sctp_init_chunk *init;
4620         struct sctp_supported_addr_param *sup_addr;
4621         struct sctp_adaptation_layer_indication *ali;
4622         struct sctp_supported_chunk_types_param *pr_supported;
4623         struct sctp_paramhdr *ph;
4624         int cnt_inits_to = 0;
4625         int error;
4626         uint16_t num_ext, chunk_len, padding_len, parameter_len;
4627
4628         /* INIT's always go to the primary (and usually ONLY address) */
4629         net = stcb->asoc.primary_destination;
4630         if (net == NULL) {
4631                 net = TAILQ_FIRST(&stcb->asoc.nets);
4632                 if (net == NULL) {
4633                         /* TSNH */
4634                         return;
4635                 }
4636                 /* we confirm any address we send an INIT to */
4637                 net->dest_state &= ~SCTP_ADDR_UNCONFIRMED;
4638                 (void)sctp_set_primary_addr(stcb, NULL, net);
4639         } else {
4640                 /* we confirm any address we send an INIT to */
4641                 net->dest_state &= ~SCTP_ADDR_UNCONFIRMED;
4642         }
4643         SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT\n");
4644 #ifdef INET6
4645         if (net->ro._l_addr.sa.sa_family == AF_INET6) {
4646                 /*
4647                  * special hook, if we are sending to link local it will not
4648                  * show up in our private address count.
4649                  */
4650                 if (IN6_IS_ADDR_LINKLOCAL(&net->ro._l_addr.sin6.sin6_addr))
4651                         cnt_inits_to = 1;
4652         }
4653 #endif
4654         if (SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
4655                 /* This case should not happen */
4656                 SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT - failed timer?\n");
4657                 return;
4658         }
4659         /* start the INIT timer */
4660         sctp_timer_start(SCTP_TIMER_TYPE_INIT, inp, stcb, net);
4661
4662         m = sctp_get_mbuf_for_msg(MCLBYTES, 1, M_NOWAIT, 1, MT_DATA);
4663         if (m == NULL) {
4664                 /* No memory, INIT timer will re-attempt. */
4665                 SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT - mbuf?\n");
4666                 return;
4667         }
4668         chunk_len = (uint16_t)sizeof(struct sctp_init_chunk);
4669         padding_len = 0;
4670         /* Now lets put the chunk header in place */
4671         init = mtod(m, struct sctp_init_chunk *);
4672         /* now the chunk header */
4673         init->ch.chunk_type = SCTP_INITIATION;
4674         init->ch.chunk_flags = 0;
4675         /* fill in later from mbuf we build */
4676         init->ch.chunk_length = 0;
4677         /* place in my tag */
4678         init->init.initiate_tag = htonl(stcb->asoc.my_vtag);
4679         /* set up some of the credits. */
4680         init->init.a_rwnd = htonl(max(inp->sctp_socket ? SCTP_SB_LIMIT_RCV(inp->sctp_socket) : 0,
4681             SCTP_MINIMAL_RWND));
4682         init->init.num_outbound_streams = htons(stcb->asoc.pre_open_streams);
4683         init->init.num_inbound_streams = htons(stcb->asoc.max_inbound_streams);
4684         init->init.initial_tsn = htonl(stcb->asoc.init_seq_number);
4685
4686         /* Adaptation layer indication parameter */
4687         if (inp->sctp_ep.adaptation_layer_indicator_provided) {
4688                 parameter_len = (uint16_t)sizeof(struct sctp_adaptation_layer_indication);
4689                 ali = (struct sctp_adaptation_layer_indication *)(mtod(m, caddr_t)+chunk_len);
4690                 ali->ph.param_type = htons(SCTP_ULP_ADAPTATION);
4691                 ali->ph.param_length = htons(parameter_len);
4692                 ali->indication = htonl(inp->sctp_ep.adaptation_layer_indicator);
4693                 chunk_len += parameter_len;
4694         }
4695
4696         /* ECN parameter */
4697         if (stcb->asoc.ecn_supported == 1) {
4698                 parameter_len = (uint16_t)sizeof(struct sctp_paramhdr);
4699                 ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
4700                 ph->param_type = htons(SCTP_ECN_CAPABLE);
4701                 ph->param_length = htons(parameter_len);
4702                 chunk_len += parameter_len;
4703         }
4704
4705         /* PR-SCTP supported parameter */
4706         if (stcb->asoc.prsctp_supported == 1) {
4707                 parameter_len = (uint16_t)sizeof(struct sctp_paramhdr);
4708                 ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
4709                 ph->param_type = htons(SCTP_PRSCTP_SUPPORTED);
4710                 ph->param_length = htons(parameter_len);
4711                 chunk_len += parameter_len;
4712         }
4713
4714         /* Add NAT friendly parameter. */
4715         if (SCTP_BASE_SYSCTL(sctp_inits_include_nat_friendly)) {
4716                 parameter_len = (uint16_t)sizeof(struct sctp_paramhdr);
4717                 ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
4718                 ph->param_type = htons(SCTP_HAS_NAT_SUPPORT);
4719                 ph->param_length = htons(parameter_len);
4720                 chunk_len += parameter_len;
4721         }
4722
4723         /* And now tell the peer which extensions we support */
4724         num_ext = 0;
4725         pr_supported = (struct sctp_supported_chunk_types_param *)(mtod(m, caddr_t)+chunk_len);
4726         if (stcb->asoc.prsctp_supported == 1) {
4727                 pr_supported->chunk_types[num_ext++] = SCTP_FORWARD_CUM_TSN;
4728                 if (stcb->asoc.idata_supported) {
4729                         pr_supported->chunk_types[num_ext++] = SCTP_IFORWARD_CUM_TSN;
4730                 }
4731         }
4732         if (stcb->asoc.auth_supported == 1) {
4733                 pr_supported->chunk_types[num_ext++] = SCTP_AUTHENTICATION;
4734         }
4735         if (stcb->asoc.asconf_supported == 1) {
4736                 pr_supported->chunk_types[num_ext++] = SCTP_ASCONF;
4737                 pr_supported->chunk_types[num_ext++] = SCTP_ASCONF_ACK;
4738         }
4739         if (stcb->asoc.reconfig_supported == 1) {
4740                 pr_supported->chunk_types[num_ext++] = SCTP_STREAM_RESET;
4741         }
4742         if (stcb->asoc.idata_supported) {
4743                 pr_supported->chunk_types[num_ext++] = SCTP_IDATA;
4744         }
4745         if (stcb->asoc.nrsack_supported == 1) {
4746                 pr_supported->chunk_types[num_ext++] = SCTP_NR_SELECTIVE_ACK;
4747         }
4748         if (stcb->asoc.pktdrop_supported == 1) {
4749                 pr_supported->chunk_types[num_ext++] = SCTP_PACKET_DROPPED;
4750         }
4751         if (num_ext > 0) {
4752                 parameter_len = (uint16_t)sizeof(struct sctp_supported_chunk_types_param) + num_ext;
4753                 pr_supported->ph.param_type = htons(SCTP_SUPPORTED_CHUNK_EXT);
4754                 pr_supported->ph.param_length = htons(parameter_len);
4755                 padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
4756                 chunk_len += parameter_len;
4757         }
4758         /* add authentication parameters */
4759         if (stcb->asoc.auth_supported) {
4760                 /* attach RANDOM parameter, if available */
4761                 if (stcb->asoc.authinfo.random != NULL) {
4762                         struct sctp_auth_random *randp;
4763
4764                         if (padding_len > 0) {
4765                                 memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
4766                                 chunk_len += padding_len;
4767                                 padding_len = 0;
4768                         }
4769                         randp = (struct sctp_auth_random *)(mtod(m, caddr_t)+chunk_len);
4770                         parameter_len = (uint16_t)sizeof(struct sctp_auth_random) + stcb->asoc.authinfo.random_len;
4771                         /* random key already contains the header */
4772                         memcpy(randp, stcb->asoc.authinfo.random->key, parameter_len);
4773                         padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
4774                         chunk_len += parameter_len;
4775                 }
4776                 /* add HMAC_ALGO parameter */
4777                 if (stcb->asoc.local_hmacs != NULL) {
4778                         struct sctp_auth_hmac_algo *hmacs;
4779
4780                         if (padding_len > 0) {
4781                                 memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
4782                                 chunk_len += padding_len;
4783                                 padding_len = 0;
4784                         }
4785                         hmacs = (struct sctp_auth_hmac_algo *)(mtod(m, caddr_t)+chunk_len);
4786                         parameter_len = (uint16_t)(sizeof(struct sctp_auth_hmac_algo) +
4787                             stcb->asoc.local_hmacs->num_algo * sizeof(uint16_t));
4788                         hmacs->ph.param_type = htons(SCTP_HMAC_LIST);
4789                         hmacs->ph.param_length = htons(parameter_len);
4790                         sctp_serialize_hmaclist(stcb->asoc.local_hmacs, (uint8_t *)hmacs->hmac_ids);
4791                         padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
4792                         chunk_len += parameter_len;
4793                 }
4794                 /* add CHUNKS parameter */
4795                 if (stcb->asoc.local_auth_chunks != NULL) {
4796                         struct sctp_auth_chunk_list *chunks;
4797
4798                         if (padding_len > 0) {
4799                                 memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
4800                                 chunk_len += padding_len;
4801                                 padding_len = 0;
4802                         }
4803                         chunks = (struct sctp_auth_chunk_list *)(mtod(m, caddr_t)+chunk_len);
4804                         parameter_len = (uint16_t)(sizeof(struct sctp_auth_chunk_list) +
4805                             sctp_auth_get_chklist_size(stcb->asoc.local_auth_chunks));
4806                         chunks->ph.param_type = htons(SCTP_CHUNK_LIST);
4807                         chunks->ph.param_length = htons(parameter_len);
4808                         sctp_serialize_auth_chunks(stcb->asoc.local_auth_chunks, chunks->chunk_types);
4809                         padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
4810                         chunk_len += parameter_len;
4811                 }
4812         }
4813
4814         /* now any cookie time extensions */
4815         if (stcb->asoc.cookie_preserve_req > 0) {
4816                 struct sctp_cookie_perserve_param *cookie_preserve;
4817
4818                 if (padding_len > 0) {
4819                         memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
4820                         chunk_len += padding_len;
4821                         padding_len = 0;
4822                 }
4823                 parameter_len = (uint16_t)sizeof(struct sctp_cookie_perserve_param);
4824                 cookie_preserve = (struct sctp_cookie_perserve_param *)(mtod(m, caddr_t)+chunk_len);
4825                 cookie_preserve->ph.param_type = htons(SCTP_COOKIE_PRESERVE);
4826                 cookie_preserve->ph.param_length = htons(parameter_len);
4827                 cookie_preserve->time = htonl(stcb->asoc.cookie_preserve_req);
4828                 stcb->asoc.cookie_preserve_req = 0;
4829                 chunk_len += parameter_len;
4830         }
4831
4832         if (stcb->asoc.scope.ipv4_addr_legal || stcb->asoc.scope.ipv6_addr_legal) {
4833                 uint8_t i;
4834
4835                 if (padding_len > 0) {
4836                         memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
4837                         chunk_len += padding_len;
4838                         padding_len = 0;
4839                 }
4840                 parameter_len = (uint16_t)sizeof(struct sctp_paramhdr);
4841                 if (stcb->asoc.scope.ipv4_addr_legal) {
4842                         parameter_len += (uint16_t)sizeof(uint16_t);
4843                 }
4844                 if (stcb->asoc.scope.ipv6_addr_legal) {
4845                         parameter_len += (uint16_t)sizeof(uint16_t);
4846                 }
4847                 sup_addr = (struct sctp_supported_addr_param *)(mtod(m, caddr_t)+chunk_len);
4848                 sup_addr->ph.param_type = htons(SCTP_SUPPORTED_ADDRTYPE);
4849                 sup_addr->ph.param_length = htons(parameter_len);
4850                 i = 0;
4851                 if (stcb->asoc.scope.ipv4_addr_legal) {
4852                         sup_addr->addr_type[i++] = htons(SCTP_IPV4_ADDRESS);
4853                 }
4854                 if (stcb->asoc.scope.ipv6_addr_legal) {
4855                         sup_addr->addr_type[i++] = htons(SCTP_IPV6_ADDRESS);
4856                 }
4857                 padding_len = 4 - 2 * i;
4858                 chunk_len += parameter_len;
4859         }
4860
4861         SCTP_BUF_LEN(m) = chunk_len;
4862         /* now the addresses */
4863         /*
4864          * To optimize this we could put the scoping stuff into a structure
4865          * and remove the individual uint8's from the assoc structure. Then
4866          * we could just sifa in the address within the stcb. But for now
4867          * this is a quick hack to get the address stuff teased apart.
4868          */
4869         m_last = sctp_add_addresses_to_i_ia(inp, stcb, &stcb->asoc.scope,
4870             m, cnt_inits_to,
4871             &padding_len, &chunk_len);
4872
4873         init->ch.chunk_length = htons(chunk_len);
4874         if (padding_len > 0) {
4875                 if (sctp_add_pad_tombuf(m_last, padding_len) == NULL) {
4876                         sctp_m_freem(m);
4877                         return;
4878                 }
4879         }
4880         SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT - calls lowlevel_output\n");
4881         if ((error = sctp_lowlevel_chunk_output(inp, stcb, net,
4882             (struct sockaddr *)&net->ro._l_addr,
4883             m, 0, NULL, 0, 0, 0, 0,
4884             inp->sctp_lport, stcb->rport, htonl(0),
4885             net->port, NULL,
4886             0, 0,
4887             so_locked))) {
4888                 SCTPDBG(SCTP_DEBUG_OUTPUT4, "Gak send error %d\n", error);
4889                 if (error == ENOBUFS) {
4890                         stcb->asoc.ifp_had_enobuf = 1;
4891                         SCTP_STAT_INCR(sctps_lowlevelerr);
4892                 }
4893         } else {
4894                 stcb->asoc.ifp_had_enobuf = 0;
4895         }
4896         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
4897         (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
4898 }
4899
4900 struct mbuf *
4901 sctp_arethere_unrecognized_parameters(struct mbuf *in_initpkt,
4902     int param_offset, int *abort_processing,
4903     struct sctp_chunkhdr *cp,
4904     int *nat_friendly,
4905     int *cookie_found)
4906 {
4907         /*
4908          * Given a mbuf containing an INIT or INIT-ACK with the param_offset
4909          * being equal to the beginning of the params i.e. (iphlen +
4910          * sizeof(struct sctp_init_msg) parse through the parameters to the
4911          * end of the mbuf verifying that all parameters are known.
4912          *
4913          * For unknown parameters build and return a mbuf with
4914          * UNRECOGNIZED_PARAMETER errors. If the flags indicate to stop
4915          * processing this chunk stop, and set *abort_processing to 1.
4916          *
4917          * By having param_offset be pre-set to where parameters begin it is
4918          * hoped that this routine may be reused in the future by new
4919          * features.
4920          */
4921         struct sctp_paramhdr *phdr, params;
4922
4923         struct mbuf *mat, *m_tmp, *op_err, *op_err_last;
4924         int at, limit, pad_needed;
4925         uint16_t ptype, plen, padded_size;
4926
4927         *abort_processing = 0;
4928         if (cookie_found != NULL) {
4929                 *cookie_found = 0;
4930         }
4931         mat = in_initpkt;
4932         limit = ntohs(cp->chunk_length) - sizeof(struct sctp_init_chunk);
4933         at = param_offset;
4934         op_err = NULL;
4935         op_err_last = NULL;
4936         pad_needed = 0;
4937         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Check for unrecognized param's\n");
4938         phdr = sctp_get_next_param(mat, at, &params, sizeof(params));
4939         while ((phdr != NULL) && ((size_t)limit >= sizeof(struct sctp_paramhdr))) {
4940                 ptype = ntohs(phdr->param_type);
4941                 plen = ntohs(phdr->param_length);
4942                 if ((plen > limit) || (plen < sizeof(struct sctp_paramhdr))) {
4943                         /* wacked parameter */
4944                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error %d\n", plen);
4945                         goto invalid_size;
4946                 }
4947                 limit -= SCTP_SIZE32(plen);
4948                 /*-
4949                  * All parameters for all chunks that we know/understand are
4950                  * listed here. We process them other places and make
4951                  * appropriate stop actions per the upper bits. However this
4952                  * is the generic routine processor's can call to get back
4953                  * an operr.. to either incorporate (init-ack) or send.
4954                  */
4955                 padded_size = SCTP_SIZE32(plen);
4956                 switch (ptype) {
4957                         /* Param's with variable size */
4958                 case SCTP_HEARTBEAT_INFO:
4959                 case SCTP_UNRECOG_PARAM:
4960                 case SCTP_ERROR_CAUSE_IND:
4961                         /* ok skip fwd */
4962                         at += padded_size;
4963                         break;
4964                 case SCTP_STATE_COOKIE:
4965                         if (cookie_found != NULL) {
4966                                 *cookie_found = 1;
4967                         }
4968                         at += padded_size;
4969                         break;
4970                         /* Param's with variable size within a range */
4971                 case SCTP_CHUNK_LIST:
4972                 case SCTP_SUPPORTED_CHUNK_EXT:
4973                         if (padded_size > (sizeof(struct sctp_supported_chunk_types_param) + (sizeof(uint8_t) * SCTP_MAX_SUPPORTED_EXT))) {
4974                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error chklist %d\n", plen);
4975                                 goto invalid_size;
4976                         }
4977                         at += padded_size;
4978                         break;
4979                 case SCTP_SUPPORTED_ADDRTYPE:
4980                         if (padded_size > SCTP_MAX_ADDR_PARAMS_SIZE) {
4981                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error supaddrtype %d\n", plen);
4982                                 goto invalid_size;
4983                         }
4984                         at += padded_size;
4985                         break;
4986                 case SCTP_RANDOM:
4987                         if (padded_size > (sizeof(struct sctp_auth_random) + SCTP_RANDOM_MAX_SIZE)) {
4988                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error random %d\n", plen);
4989                                 goto invalid_size;
4990                         }
4991                         at += padded_size;
4992                         break;
4993                 case SCTP_SET_PRIM_ADDR:
4994                 case SCTP_DEL_IP_ADDRESS:
4995                 case SCTP_ADD_IP_ADDRESS:
4996                         if ((padded_size != sizeof(struct sctp_asconf_addrv4_param)) &&
4997                             (padded_size != sizeof(struct sctp_asconf_addr_param))) {
4998                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error setprim %d\n", plen);
4999                                 goto invalid_size;
5000                         }
5001                         at += padded_size;
5002                         break;
5003                         /* Param's with a fixed size */
5004                 case SCTP_IPV4_ADDRESS:
5005                         if (padded_size != sizeof(struct sctp_ipv4addr_param)) {
5006                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error ipv4 addr %d\n", plen);
5007                                 goto invalid_size;
5008                         }
5009                         at += padded_size;
5010                         break;
5011                 case SCTP_IPV6_ADDRESS:
5012                         if (padded_size != sizeof(struct sctp_ipv6addr_param)) {
5013                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error ipv6 addr %d\n", plen);
5014                                 goto invalid_size;
5015                         }
5016                         at += padded_size;
5017                         break;
5018                 case SCTP_COOKIE_PRESERVE:
5019                         if (padded_size != sizeof(struct sctp_cookie_perserve_param)) {
5020                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error cookie-preserve %d\n", plen);
5021                                 goto invalid_size;
5022                         }
5023                         at += padded_size;
5024                         break;
5025                 case SCTP_HAS_NAT_SUPPORT:
5026                         *nat_friendly = 1;
5027                         /* fall through */
5028                 case SCTP_PRSCTP_SUPPORTED:
5029                         if (padded_size != sizeof(struct sctp_paramhdr)) {
5030                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error prsctp/nat support %d\n", plen);
5031                                 goto invalid_size;
5032                         }
5033                         at += padded_size;
5034                         break;
5035                 case SCTP_ECN_CAPABLE:
5036                         if (padded_size != sizeof(struct sctp_paramhdr)) {
5037                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error ecn %d\n", plen);
5038                                 goto invalid_size;
5039                         }
5040                         at += padded_size;
5041                         break;
5042                 case SCTP_ULP_ADAPTATION:
5043                         if (padded_size != sizeof(struct sctp_adaptation_layer_indication)) {
5044                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error adapatation %d\n", plen);
5045                                 goto invalid_size;
5046                         }
5047                         at += padded_size;
5048                         break;
5049                 case SCTP_SUCCESS_REPORT:
5050                         if (padded_size != sizeof(struct sctp_asconf_paramhdr)) {
5051                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error success %d\n", plen);
5052                                 goto invalid_size;
5053                         }
5054                         at += padded_size;
5055                         break;
5056                 case SCTP_HOSTNAME_ADDRESS:
5057                         {
5058                                 /* Hostname parameters are deprecated. */
5059                                 struct sctp_gen_error_cause *cause;
5060                                 int l_len;
5061
5062                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Can't handle hostname addresses.. abort processing\n");
5063                                 *abort_processing = 1;
5064                                 sctp_m_freem(op_err);
5065                                 op_err = NULL;
5066                                 op_err_last = NULL;
5067 #ifdef INET6
5068                                 l_len = SCTP_MIN_OVERHEAD;
5069 #else
5070                                 l_len = SCTP_MIN_V4_OVERHEAD;
5071 #endif
5072                                 l_len += sizeof(struct sctp_chunkhdr);
5073                                 l_len += sizeof(struct sctp_gen_error_cause);
5074                                 op_err = sctp_get_mbuf_for_msg(l_len, 0, M_NOWAIT, 1, MT_DATA);
5075                                 if (op_err != NULL) {
5076                                         /*
5077                                          * Pre-reserve space for IP, SCTP,
5078                                          * and chunk header.
5079                                          */
5080 #ifdef INET6
5081                                         SCTP_BUF_RESV_UF(op_err, sizeof(struct ip6_hdr));
5082 #else
5083                                         SCTP_BUF_RESV_UF(op_err, sizeof(struct ip));
5084 #endif
5085                                         SCTP_BUF_RESV_UF(op_err, sizeof(struct sctphdr));
5086                                         SCTP_BUF_RESV_UF(op_err, sizeof(struct sctp_chunkhdr));
5087                                         SCTP_BUF_LEN(op_err) = sizeof(struct sctp_gen_error_cause);
5088                                         cause = mtod(op_err, struct sctp_gen_error_cause *);
5089                                         cause->code = htons(SCTP_CAUSE_UNRESOLVABLE_ADDR);
5090                                         cause->length = htons((uint16_t)(sizeof(struct sctp_gen_error_cause) + plen));
5091                                         SCTP_BUF_NEXT(op_err) = SCTP_M_COPYM(mat, at, plen, M_NOWAIT);
5092                                         if (SCTP_BUF_NEXT(op_err) == NULL) {
5093                                                 sctp_m_freem(op_err);
5094                                                 op_err = NULL;
5095                                                 op_err_last = NULL;
5096                                         }
5097                                 }
5098                                 return (op_err);
5099                         }
5100                 default:
5101                         /*
5102                          * we do not recognize the parameter figure out what
5103                          * we do.
5104                          */
5105                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Hit default param %x\n", ptype);
5106                         if ((ptype & 0x4000) == 0x4000) {
5107                                 /* Report bit is set?? */
5108                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "report op err\n");
5109                                 if (op_err == NULL) {
5110                                         int l_len;
5111
5112                                         /* Ok need to try to get an mbuf */
5113 #ifdef INET6
5114                                         l_len = SCTP_MIN_OVERHEAD;
5115 #else
5116                                         l_len = SCTP_MIN_V4_OVERHEAD;
5117 #endif
5118                                         l_len += sizeof(struct sctp_chunkhdr);
5119                                         l_len += sizeof(struct sctp_paramhdr);
5120                                         op_err = sctp_get_mbuf_for_msg(l_len, 0, M_NOWAIT, 1, MT_DATA);
5121                                         if (op_err) {
5122                                                 SCTP_BUF_LEN(op_err) = 0;
5123 #ifdef INET6
5124                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip6_hdr));
5125 #else
5126                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip));
5127 #endif
5128                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctphdr));
5129                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctp_chunkhdr));
5130                                                 op_err_last = op_err;
5131                                         }
5132                                 }
5133                                 if (op_err != NULL) {
5134                                         /* If we have space */
5135                                         struct sctp_paramhdr *param;
5136
5137                                         if (pad_needed > 0) {
5138                                                 op_err_last = sctp_add_pad_tombuf(op_err_last, pad_needed);
5139                                         }
5140                                         if (op_err_last == NULL) {
5141                                                 sctp_m_freem(op_err);
5142                                                 op_err = NULL;
5143                                                 op_err_last = NULL;
5144                                                 goto more_processing;
5145                                         }
5146                                         if (M_TRAILINGSPACE(op_err_last) < (int)sizeof(struct sctp_paramhdr)) {
5147                                                 m_tmp = sctp_get_mbuf_for_msg(sizeof(struct sctp_paramhdr), 0, M_NOWAIT, 1, MT_DATA);
5148                                                 if (m_tmp == NULL) {
5149                                                         sctp_m_freem(op_err);
5150                                                         op_err = NULL;
5151                                                         op_err_last = NULL;
5152                                                         goto more_processing;
5153                                                 }
5154                                                 SCTP_BUF_LEN(m_tmp) = 0;
5155                                                 SCTP_BUF_NEXT(m_tmp) = NULL;
5156                                                 SCTP_BUF_NEXT(op_err_last) = m_tmp;
5157                                                 op_err_last = m_tmp;
5158                                         }
5159                                         param = (struct sctp_paramhdr *)(mtod(op_err_last, caddr_t)+SCTP_BUF_LEN(op_err_last));
5160                                         param->param_type = htons(SCTP_UNRECOG_PARAM);
5161                                         param->param_length = htons((uint16_t)sizeof(struct sctp_paramhdr) + plen);
5162                                         SCTP_BUF_LEN(op_err_last) += sizeof(struct sctp_paramhdr);
5163                                         SCTP_BUF_NEXT(op_err_last) = SCTP_M_COPYM(mat, at, plen, M_NOWAIT);
5164                                         if (SCTP_BUF_NEXT(op_err_last) == NULL) {
5165                                                 sctp_m_freem(op_err);
5166                                                 op_err = NULL;
5167                                                 op_err_last = NULL;
5168                                                 goto more_processing;
5169                                         } else {
5170                                                 while (SCTP_BUF_NEXT(op_err_last) != NULL) {
5171                                                         op_err_last = SCTP_BUF_NEXT(op_err_last);
5172                                                 }
5173                                         }
5174                                         if (plen % 4 != 0) {
5175                                                 pad_needed = 4 - (plen % 4);
5176                                         } else {
5177                                                 pad_needed = 0;
5178                                         }
5179                                 }
5180                         }
5181         more_processing:
5182                         if ((ptype & 0x8000) == 0x0000) {
5183                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "stop proc\n");
5184                                 return (op_err);
5185                         } else {
5186                                 /* skip this chunk and continue processing */
5187                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "move on\n");
5188                                 at += SCTP_SIZE32(plen);
5189                         }
5190                         break;
5191                 }
5192                 phdr = sctp_get_next_param(mat, at, &params, sizeof(params));
5193         }
5194         return (op_err);
5195 invalid_size:
5196         SCTPDBG(SCTP_DEBUG_OUTPUT1, "abort flag set\n");
5197         *abort_processing = 1;
5198         sctp_m_freem(op_err);
5199         op_err = NULL;
5200         op_err_last = NULL;
5201         if (phdr != NULL) {
5202                 struct sctp_paramhdr *param;
5203                 int l_len;
5204 #ifdef INET6
5205                 l_len = SCTP_MIN_OVERHEAD;
5206 #else
5207                 l_len = SCTP_MIN_V4_OVERHEAD;
5208 #endif
5209                 l_len += sizeof(struct sctp_chunkhdr);
5210                 l_len += (2 * sizeof(struct sctp_paramhdr));
5211                 op_err = sctp_get_mbuf_for_msg(l_len, 0, M_NOWAIT, 1, MT_DATA);
5212                 if (op_err) {
5213                         SCTP_BUF_LEN(op_err) = 0;
5214 #ifdef INET6
5215                         SCTP_BUF_RESV_UF(op_err, sizeof(struct ip6_hdr));
5216 #else
5217                         SCTP_BUF_RESV_UF(op_err, sizeof(struct ip));
5218 #endif
5219                         SCTP_BUF_RESV_UF(op_err, sizeof(struct sctphdr));
5220                         SCTP_BUF_RESV_UF(op_err, sizeof(struct sctp_chunkhdr));
5221                         SCTP_BUF_LEN(op_err) = 2 * sizeof(struct sctp_paramhdr);
5222                         param = mtod(op_err, struct sctp_paramhdr *);
5223                         param->param_type = htons(SCTP_CAUSE_PROTOCOL_VIOLATION);
5224                         param->param_length = htons(2 * sizeof(struct sctp_paramhdr));
5225                         param++;
5226                         param->param_type = htons(ptype);
5227                         param->param_length = htons(plen);
5228                 }
5229         }
5230         return (op_err);
5231 }
5232
5233 /*
5234  * Given a INIT chunk, look through the parameters to verify that there
5235  * are no new addresses.
5236  * Return true, if there is a new address or there is a problem parsing
5237    the parameters. Provide an optional error cause used when sending an ABORT.
5238  * Return false, if there are no new addresses and there is no problem in
5239    parameter processing.
5240  */
5241 static bool
5242 sctp_are_there_new_addresses(struct sctp_association *asoc,
5243     struct mbuf *in_initpkt, int offset, int limit, struct sockaddr *src,
5244     struct mbuf **op_err)
5245 {
5246         struct sockaddr *sa_touse;
5247         struct sockaddr *sa;
5248         struct sctp_paramhdr *phdr, params;
5249         struct sctp_nets *net;
5250 #ifdef INET
5251         struct sockaddr_in sin4, *sa4;
5252 #endif
5253 #ifdef INET6
5254         struct sockaddr_in6 sin6, *sa6;
5255 #endif
5256         uint16_t ptype, plen;
5257         bool fnd, check_src;
5258
5259         *op_err = NULL;
5260 #ifdef INET
5261         memset(&sin4, 0, sizeof(sin4));
5262         sin4.sin_family = AF_INET;
5263         sin4.sin_len = sizeof(sin4);
5264 #endif
5265 #ifdef INET6
5266         memset(&sin6, 0, sizeof(sin6));
5267         sin6.sin6_family = AF_INET6;
5268         sin6.sin6_len = sizeof(sin6);
5269 #endif
5270         /* First what about the src address of the pkt ? */
5271         check_src = false;
5272         switch (src->sa_family) {
5273 #ifdef INET
5274         case AF_INET:
5275                 if (asoc->scope.ipv4_addr_legal) {
5276                         check_src = true;
5277                 }
5278                 break;
5279 #endif
5280 #ifdef INET6
5281         case AF_INET6:
5282                 if (asoc->scope.ipv6_addr_legal) {
5283                         check_src = true;
5284                 }
5285                 break;
5286 #endif
5287         default:
5288                 /* TSNH */
5289                 break;
5290         }
5291         if (check_src) {
5292                 fnd = false;
5293                 TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
5294                         sa = (struct sockaddr *)&net->ro._l_addr;
5295                         if (sa->sa_family == src->sa_family) {
5296 #ifdef INET
5297                                 if (sa->sa_family == AF_INET) {
5298                                         struct sockaddr_in *src4;
5299
5300                                         sa4 = (struct sockaddr_in *)sa;
5301                                         src4 = (struct sockaddr_in *)src;
5302                                         if (sa4->sin_addr.s_addr == src4->sin_addr.s_addr) {
5303                                                 fnd = true;
5304                                                 break;
5305                                         }
5306                                 }
5307 #endif
5308 #ifdef INET6
5309                                 if (sa->sa_family == AF_INET6) {
5310                                         struct sockaddr_in6 *src6;
5311
5312                                         sa6 = (struct sockaddr_in6 *)sa;
5313                                         src6 = (struct sockaddr_in6 *)src;
5314                                         if (SCTP6_ARE_ADDR_EQUAL(sa6, src6)) {
5315                                                 fnd = true;
5316                                                 break;
5317                                         }
5318                                 }
5319 #endif
5320                         }
5321                 }
5322                 if (!fnd) {
5323                         /*
5324                          * If sending an ABORT in case of an additional
5325                          * address, don't use the new address error cause.
5326                          * This looks no different than if no listener was
5327                          * present.
5328                          */
5329                         *op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), "Address added");
5330                         return (true);
5331                 }
5332         }
5333         /* Ok so far lets munge through the rest of the packet */
5334         offset += sizeof(struct sctp_init_chunk);
5335         phdr = sctp_get_next_param(in_initpkt, offset, &params, sizeof(params));
5336         while (phdr) {
5337                 sa_touse = NULL;
5338                 ptype = ntohs(phdr->param_type);
5339                 plen = ntohs(phdr->param_length);
5340                 if (offset + plen > limit) {
5341                         *op_err = sctp_generate_cause(SCTP_CAUSE_PROTOCOL_VIOLATION, "Partial parameter");
5342                         return (true);
5343                 }
5344                 if (plen < sizeof(struct sctp_paramhdr)) {
5345                         *op_err = sctp_generate_cause(SCTP_CAUSE_PROTOCOL_VIOLATION, "Parameter length too small");
5346                         return (true);
5347                 }
5348                 switch (ptype) {
5349 #ifdef INET
5350                 case SCTP_IPV4_ADDRESS:
5351                         {
5352                                 struct sctp_ipv4addr_param *p4, p4_buf;
5353
5354                                 if (plen != sizeof(struct sctp_ipv4addr_param)) {
5355                                         *op_err = sctp_generate_cause(SCTP_CAUSE_PROTOCOL_VIOLATION, "Parameter length illegal");
5356                                         return (true);
5357                                 }
5358                                 phdr = sctp_get_next_param(in_initpkt, offset,
5359                                     (struct sctp_paramhdr *)&p4_buf, sizeof(p4_buf));
5360                                 if (phdr == NULL) {
5361                                         *op_err = sctp_generate_cause(SCTP_CAUSE_PROTOCOL_VIOLATION, "");
5362                                         return (true);
5363                                 }
5364                                 if (asoc->scope.ipv4_addr_legal) {
5365                                         p4 = (struct sctp_ipv4addr_param *)phdr;
5366                                         sin4.sin_addr.s_addr = p4->addr;
5367                                         sa_touse = (struct sockaddr *)&sin4;
5368                                 }
5369                                 break;
5370                         }
5371 #endif
5372 #ifdef INET6
5373                 case SCTP_IPV6_ADDRESS:
5374                         {
5375                                 struct sctp_ipv6addr_param *p6, p6_buf;
5376
5377                                 if (plen != sizeof(struct sctp_ipv6addr_param)) {
5378                                         *op_err = sctp_generate_cause(SCTP_CAUSE_PROTOCOL_VIOLATION, "Parameter length illegal");
5379                                         return (true);
5380                                 }
5381                                 phdr = sctp_get_next_param(in_initpkt, offset,
5382                                     (struct sctp_paramhdr *)&p6_buf, sizeof(p6_buf));
5383                                 if (phdr == NULL) {
5384                                         *op_err = sctp_generate_cause(SCTP_CAUSE_PROTOCOL_VIOLATION, "");
5385                                         return (true);
5386                                 }
5387                                 if (asoc->scope.ipv6_addr_legal) {
5388                                         p6 = (struct sctp_ipv6addr_param *)phdr;
5389                                         memcpy((caddr_t)&sin6.sin6_addr, p6->addr,
5390                                             sizeof(p6->addr));
5391                                         sa_touse = (struct sockaddr *)&sin6;
5392                                 }
5393                                 break;
5394                         }
5395 #endif
5396                 default:
5397                         sa_touse = NULL;
5398                         break;
5399                 }
5400                 if (sa_touse) {
5401                         /* ok, sa_touse points to one to check */
5402                         fnd = false;
5403                         TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
5404                                 sa = (struct sockaddr *)&net->ro._l_addr;
5405                                 if (sa->sa_family != sa_touse->sa_family) {
5406                                         continue;
5407                                 }
5408 #ifdef INET
5409                                 if (sa->sa_family == AF_INET) {
5410                                         sa4 = (struct sockaddr_in *)sa;
5411                                         if (sa4->sin_addr.s_addr ==
5412                                             sin4.sin_addr.s_addr) {
5413                                                 fnd = true;
5414                                                 break;
5415                                         }
5416                                 }
5417 #endif
5418 #ifdef INET6
5419                                 if (sa->sa_family == AF_INET6) {
5420                                         sa6 = (struct sockaddr_in6 *)sa;
5421                                         if (SCTP6_ARE_ADDR_EQUAL(
5422                                             sa6, &sin6)) {
5423                                                 fnd = true;
5424                                                 break;
5425                                         }
5426                                 }
5427 #endif
5428                         }
5429                         if (!fnd) {
5430                                 /*
5431                                  * If sending an ABORT in case of an
5432                                  * additional address, don't use the new
5433                                  * address error cause. This looks no
5434                                  * different than if no listener was
5435                                  * present.
5436                                  */
5437                                 *op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), "Address added");
5438                                 return (true);
5439                         }
5440                 }
5441                 offset += SCTP_SIZE32(plen);
5442                 if (offset >= limit) {
5443                         break;
5444                 }
5445                 phdr = sctp_get_next_param(in_initpkt, offset, &params, sizeof(params));
5446         }
5447         return (false);
5448 }
5449
5450 /*
5451  * Given a MBUF chain that was sent into us containing an INIT. Build a
5452  * INIT-ACK with COOKIE and send back. We assume that the in_initpkt has done
5453  * a pullup to include IPv6/4header, SCTP header and initial part of INIT
5454  * message (i.e. the struct sctp_init_msg).
5455  */
5456 void
5457 sctp_send_initiate_ack(struct sctp_inpcb *inp, struct sctp_tcb *stcb,
5458     struct sctp_nets *src_net, struct mbuf *init_pkt,
5459     int iphlen, int offset,
5460     struct sockaddr *src, struct sockaddr *dst,
5461     struct sctphdr *sh, struct sctp_init_chunk *init_chk,
5462     uint8_t mflowtype, uint32_t mflowid,
5463     uint32_t vrf_id, uint16_t port)
5464 {
5465         struct sctp_association *asoc;
5466         struct mbuf *m, *m_tmp, *m_last, *m_cookie, *op_err;
5467         struct sctp_init_ack_chunk *initack;
5468         struct sctp_adaptation_layer_indication *ali;
5469         struct sctp_supported_chunk_types_param *pr_supported;
5470         struct sctp_paramhdr *ph;
5471         union sctp_sockstore *over_addr;
5472         struct sctp_scoping scp;
5473         struct timeval now;
5474 #ifdef INET
5475         struct sockaddr_in *dst4 = (struct sockaddr_in *)dst;
5476         struct sockaddr_in *src4 = (struct sockaddr_in *)src;
5477         struct sockaddr_in *sin;
5478 #endif
5479 #ifdef INET6
5480         struct sockaddr_in6 *dst6 = (struct sockaddr_in6 *)dst;
5481         struct sockaddr_in6 *src6 = (struct sockaddr_in6 *)src;
5482         struct sockaddr_in6 *sin6;
5483 #endif
5484         struct sockaddr *to;
5485         struct sctp_state_cookie stc;
5486         struct sctp_nets *net = NULL;
5487         uint8_t *signature = NULL;
5488         int cnt_inits_to = 0;
5489         uint16_t his_limit, i_want;
5490         int abort_flag;
5491         int nat_friendly = 0;
5492         int error;
5493         struct socket *so;
5494         uint16_t num_ext, chunk_len, padding_len, parameter_len;
5495
5496         if (stcb) {
5497                 asoc = &stcb->asoc;
5498         } else {
5499                 asoc = NULL;
5500         }
5501         if ((asoc != NULL) &&
5502             (SCTP_GET_STATE(stcb) != SCTP_STATE_COOKIE_WAIT)) {
5503                 if (sctp_are_there_new_addresses(asoc, init_pkt, offset, offset + ntohs(init_chk->ch.chunk_length), src, &op_err)) {
5504                         /*
5505                          * new addresses, out of here in non-cookie-wait
5506                          * states
5507                          */
5508                         sctp_send_abort(init_pkt, iphlen, src, dst, sh, 0, op_err,
5509                             mflowtype, mflowid, inp->fibnum,
5510                             vrf_id, port);
5511                         return;
5512                 }
5513                 if (src_net != NULL && (src_net->port != port)) {
5514                         /*
5515                          * change of remote encapsulation port, out of here
5516                          * in non-cookie-wait states
5517                          *
5518                          * Send an ABORT, without an specific error cause.
5519                          * This looks no different than if no listener was
5520                          * present.
5521                          */
5522                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
5523                             "Remote encapsulation port changed");
5524                         sctp_send_abort(init_pkt, iphlen, src, dst, sh, 0, op_err,
5525                             mflowtype, mflowid, inp->fibnum,
5526                             vrf_id, port);
5527                         return;
5528                 }
5529         }
5530         abort_flag = 0;
5531         op_err = sctp_arethere_unrecognized_parameters(init_pkt,
5532             (offset + sizeof(struct sctp_init_chunk)),
5533             &abort_flag,
5534             (struct sctp_chunkhdr *)init_chk,
5535             &nat_friendly, NULL);
5536         if (abort_flag) {
5537 do_a_abort:
5538                 if (op_err == NULL) {
5539                         char msg[SCTP_DIAG_INFO_LEN];
5540
5541                         SCTP_SNPRINTF(msg, sizeof(msg), "%s:%d at %s", __FILE__, __LINE__, __func__);
5542                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
5543                             msg);
5544                 }
5545                 sctp_send_abort(init_pkt, iphlen, src, dst, sh,
5546                     init_chk->init.initiate_tag, op_err,
5547                     mflowtype, mflowid, inp->fibnum,
5548                     vrf_id, port);
5549                 return;
5550         }
5551         m = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
5552         if (m == NULL) {
5553                 /* No memory, INIT timer will re-attempt. */
5554                 sctp_m_freem(op_err);
5555                 return;
5556         }
5557         chunk_len = (uint16_t)sizeof(struct sctp_init_ack_chunk);
5558         padding_len = 0;
5559
5560         /*
5561          * We might not overwrite the identification[] completely and on
5562          * some platforms time_entered will contain some padding. Therefore
5563          * zero out the cookie to avoid putting uninitialized memory on the
5564          * wire.
5565          */
5566         memset(&stc, 0, sizeof(struct sctp_state_cookie));
5567
5568         /* the time I built cookie */
5569         (void)SCTP_GETTIME_TIMEVAL(&now);
5570         stc.time_entered.tv_sec = now.tv_sec;
5571         stc.time_entered.tv_usec = now.tv_usec;
5572
5573         /* populate any tie tags */
5574         if (asoc != NULL) {
5575                 /* unlock before tag selections */
5576                 stc.tie_tag_my_vtag = asoc->my_vtag_nonce;
5577                 stc.tie_tag_peer_vtag = asoc->peer_vtag_nonce;
5578                 stc.cookie_life = asoc->cookie_life;
5579                 net = asoc->primary_destination;
5580         } else {
5581                 stc.tie_tag_my_vtag = 0;
5582                 stc.tie_tag_peer_vtag = 0;
5583                 /* life I will award this cookie */
5584                 stc.cookie_life = inp->sctp_ep.def_cookie_life;
5585         }
5586
5587         /* copy in the ports for later check */
5588         stc.myport = sh->dest_port;
5589         stc.peerport = sh->src_port;
5590
5591         /*
5592          * If we wanted to honor cookie life extensions, we would add to
5593          * stc.cookie_life. For now we should NOT honor any extension
5594          */
5595         stc.site_scope = stc.local_scope = stc.loopback_scope = 0;
5596         if (inp->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
5597                 stc.ipv6_addr_legal = 1;
5598                 if (SCTP_IPV6_V6ONLY(inp)) {
5599                         stc.ipv4_addr_legal = 0;
5600                 } else {
5601                         stc.ipv4_addr_legal = 1;
5602                 }
5603         } else {
5604                 stc.ipv6_addr_legal = 0;
5605                 stc.ipv4_addr_legal = 1;
5606         }
5607         stc.ipv4_scope = 0;
5608         if (net == NULL) {
5609                 to = src;
5610                 switch (dst->sa_family) {
5611 #ifdef INET
5612                 case AF_INET:
5613                         {
5614                                 /* lookup address */
5615                                 stc.address[0] = src4->sin_addr.s_addr;
5616                                 stc.address[1] = 0;
5617                                 stc.address[2] = 0;
5618                                 stc.address[3] = 0;
5619                                 stc.addr_type = SCTP_IPV4_ADDRESS;
5620                                 /* local from address */
5621                                 stc.laddress[0] = dst4->sin_addr.s_addr;
5622                                 stc.laddress[1] = 0;
5623                                 stc.laddress[2] = 0;
5624                                 stc.laddress[3] = 0;
5625                                 stc.laddr_type = SCTP_IPV4_ADDRESS;
5626                                 /* scope_id is only for v6 */
5627                                 stc.scope_id = 0;
5628                                 if ((IN4_ISPRIVATE_ADDRESS(&src4->sin_addr)) ||
5629                                     (IN4_ISPRIVATE_ADDRESS(&dst4->sin_addr))) {
5630                                         stc.ipv4_scope = 1;
5631                                 }
5632                                 /* Must use the address in this case */
5633                                 if (sctp_is_address_on_local_host(src, vrf_id)) {
5634                                         stc.loopback_scope = 1;
5635                                         stc.ipv4_scope = 1;
5636                                         stc.site_scope = 1;
5637                                         stc.local_scope = 0;
5638                                 }
5639                                 break;
5640                         }
5641 #endif
5642 #ifdef INET6
5643                 case AF_INET6:
5644                         {
5645                                 stc.addr_type = SCTP_IPV6_ADDRESS;
5646                                 memcpy(&stc.address, &src6->sin6_addr, sizeof(struct in6_addr));
5647                                 stc.scope_id = ntohs(in6_getscope(&src6->sin6_addr));
5648                                 if (sctp_is_address_on_local_host(src, vrf_id)) {
5649                                         stc.loopback_scope = 1;
5650                                         stc.local_scope = 0;
5651                                         stc.site_scope = 1;
5652                                         stc.ipv4_scope = 1;
5653                                 } else if (IN6_IS_ADDR_LINKLOCAL(&src6->sin6_addr) ||
5654                                     IN6_IS_ADDR_LINKLOCAL(&dst6->sin6_addr)) {
5655                                         /*
5656                                          * If the new destination or source
5657                                          * is a LINK_LOCAL we must have
5658                                          * common both site and local scope.
5659                                          * Don't set local scope though
5660                                          * since we must depend on the
5661                                          * source to be added implicitly. We
5662                                          * cannot assure just because we
5663                                          * share one link that all links are
5664                                          * common.
5665                                          */
5666                                         stc.local_scope = 0;
5667                                         stc.site_scope = 1;
5668                                         stc.ipv4_scope = 1;
5669                                         /*
5670                                          * we start counting for the private
5671                                          * address stuff at 1. since the
5672                                          * link local we source from won't
5673                                          * show up in our scoped count.
5674                                          */
5675                                         cnt_inits_to = 1;
5676                                         /*
5677                                          * pull out the scope_id from
5678                                          * incoming pkt
5679                                          */
5680                                 } else if (IN6_IS_ADDR_SITELOCAL(&src6->sin6_addr) ||
5681                                     IN6_IS_ADDR_SITELOCAL(&dst6->sin6_addr)) {
5682                                         /*
5683                                          * If the new destination or source
5684                                          * is SITE_LOCAL then we must have
5685                                          * site scope in common.
5686                                          */
5687                                         stc.site_scope = 1;
5688                                 }
5689                                 memcpy(&stc.laddress, &dst6->sin6_addr, sizeof(struct in6_addr));
5690                                 stc.laddr_type = SCTP_IPV6_ADDRESS;
5691                                 break;
5692                         }
5693 #endif
5694                 default:
5695                         /* TSNH */
5696                         goto do_a_abort;
5697                         break;
5698                 }
5699         } else {
5700                 /* set the scope per the existing tcb */
5701
5702 #ifdef INET6
5703                 struct sctp_nets *lnet;
5704 #endif
5705
5706                 stc.loopback_scope = asoc->scope.loopback_scope;
5707                 stc.ipv4_scope = asoc->scope.ipv4_local_scope;
5708                 stc.site_scope = asoc->scope.site_scope;
5709                 stc.local_scope = asoc->scope.local_scope;
5710 #ifdef INET6
5711                 /* Why do we not consider IPv4 LL addresses? */
5712                 TAILQ_FOREACH(lnet, &asoc->nets, sctp_next) {
5713                         if (lnet->ro._l_addr.sin6.sin6_family == AF_INET6) {
5714                                 if (IN6_IS_ADDR_LINKLOCAL(&lnet->ro._l_addr.sin6.sin6_addr)) {
5715                                         /*
5716                                          * if we have a LL address, start
5717                                          * counting at 1.
5718                                          */
5719                                         cnt_inits_to = 1;
5720                                 }
5721                         }
5722                 }
5723 #endif
5724                 /* use the net pointer */
5725                 to = (struct sockaddr *)&net->ro._l_addr;
5726                 switch (to->sa_family) {
5727 #ifdef INET
5728                 case AF_INET:
5729                         sin = (struct sockaddr_in *)to;
5730                         stc.address[0] = sin->sin_addr.s_addr;
5731                         stc.address[1] = 0;
5732                         stc.address[2] = 0;
5733                         stc.address[3] = 0;
5734                         stc.addr_type = SCTP_IPV4_ADDRESS;
5735                         if (net->src_addr_selected == 0) {
5736                                 /*
5737                                  * strange case here, the INIT should have
5738                                  * did the selection.
5739                                  */
5740                                 net->ro._s_addr = sctp_source_address_selection(inp,
5741                                     stcb, (sctp_route_t *)&net->ro,
5742                                     net, 0, vrf_id);
5743                                 if (net->ro._s_addr == NULL) {
5744                                         sctp_m_freem(op_err);
5745                                         sctp_m_freem(m);
5746                                         return;
5747                                 }
5748
5749                                 net->src_addr_selected = 1;
5750                         }
5751                         stc.laddress[0] = net->ro._s_addr->address.sin.sin_addr.s_addr;
5752                         stc.laddress[1] = 0;
5753                         stc.laddress[2] = 0;
5754                         stc.laddress[3] = 0;
5755                         stc.laddr_type = SCTP_IPV4_ADDRESS;
5756                         /* scope_id is only for v6 */
5757                         stc.scope_id = 0;
5758                         break;
5759 #endif
5760 #ifdef INET6
5761                 case AF_INET6:
5762                         sin6 = (struct sockaddr_in6 *)to;
5763                         memcpy(&stc.address, &sin6->sin6_addr,
5764                             sizeof(struct in6_addr));
5765                         stc.addr_type = SCTP_IPV6_ADDRESS;
5766                         stc.scope_id = sin6->sin6_scope_id;
5767                         if (net->src_addr_selected == 0) {
5768                                 /*
5769                                  * strange case here, the INIT should have
5770                                  * done the selection.
5771                                  */
5772                                 net->ro._s_addr = sctp_source_address_selection(inp,
5773                                     stcb, (sctp_route_t *)&net->ro,
5774                                     net, 0, vrf_id);
5775                                 if (net->ro._s_addr == NULL) {
5776                                         sctp_m_freem(op_err);
5777                                         sctp_m_freem(m);
5778                                         return;
5779                                 }
5780
5781                                 net->src_addr_selected = 1;
5782                         }
5783                         memcpy(&stc.laddress, &net->ro._s_addr->address.sin6.sin6_addr,
5784                             sizeof(struct in6_addr));
5785                         stc.laddr_type = SCTP_IPV6_ADDRESS;
5786                         break;
5787 #endif
5788                 }
5789         }
5790         /* Now lets put the SCTP header in place */
5791         initack = mtod(m, struct sctp_init_ack_chunk *);
5792         /* Save it off for quick ref */
5793         stc.peers_vtag = ntohl(init_chk->init.initiate_tag);
5794         /* who are we */
5795         memcpy(stc.identification, SCTP_VERSION_STRING,
5796             min(strlen(SCTP_VERSION_STRING), sizeof(stc.identification)));
5797         memset(stc.reserved, 0, SCTP_RESERVE_SPACE);
5798         /* now the chunk header */
5799         initack->ch.chunk_type = SCTP_INITIATION_ACK;
5800         initack->ch.chunk_flags = 0;
5801         /* fill in later from mbuf we build */
5802         initack->ch.chunk_length = 0;
5803         /* place in my tag */
5804         if ((asoc != NULL) &&
5805             ((SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_WAIT) ||
5806             (SCTP_GET_STATE(stcb) == SCTP_STATE_INUSE) ||
5807             (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED))) {
5808                 /* re-use the v-tags and init-seq here */
5809                 initack->init.initiate_tag = htonl(asoc->my_vtag);
5810                 initack->init.initial_tsn = htonl(asoc->init_seq_number);
5811         } else {
5812                 uint32_t vtag, itsn;
5813
5814                 if (asoc) {
5815                         atomic_add_int(&asoc->refcnt, 1);
5816                         SCTP_TCB_UNLOCK(stcb);
5817         new_tag:
5818                         SCTP_INP_INFO_RLOCK();
5819                         vtag = sctp_select_a_tag(inp, inp->sctp_lport, sh->src_port, 1);
5820                         SCTP_INP_INFO_RUNLOCK();
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_subtract_int(&asoc->refcnt, 1);
5834                 } else {
5835                         SCTP_INP_INCR_REF(inp);
5836                         SCTP_INP_RUNLOCK(inp);
5837                         SCTP_INP_INFO_RLOCK();
5838                         vtag = sctp_select_a_tag(inp, inp->sctp_lport, sh->src_port, 1);
5839                         SCTP_INP_INFO_RUNLOCK();
5840                         initack->init.initiate_tag = htonl(vtag);
5841                         /* get a TSN to use too */
5842                         initack->init.initial_tsn = htonl(sctp_select_initial_TSN(&inp->sctp_ep));
5843                         SCTP_INP_RLOCK(inp);
5844                         SCTP_INP_DECR_REF(inp);
5845                 }
5846         }
5847         /* save away my tag to */
5848         stc.my_vtag = initack->init.initiate_tag;
5849
5850         /* set up some of the credits. */
5851         so = inp->sctp_socket;
5852         if (so == NULL) {
5853                 /* memory problem */
5854                 sctp_m_freem(op_err);
5855                 sctp_m_freem(m);
5856                 return;
5857         } else {
5858                 initack->init.a_rwnd = htonl(max(SCTP_SB_LIMIT_RCV(so), SCTP_MINIMAL_RWND));
5859         }
5860         /* set what I want */
5861         his_limit = ntohs(init_chk->init.num_inbound_streams);
5862         /* choose what I want */
5863         if (asoc != NULL) {
5864                 if (asoc->streamoutcnt > asoc->pre_open_streams) {
5865                         i_want = asoc->streamoutcnt;
5866                 } else {
5867                         i_want = asoc->pre_open_streams;
5868                 }
5869         } else {
5870                 i_want = inp->sctp_ep.pre_open_stream_count;
5871         }
5872         if (his_limit < i_want) {
5873                 /* I Want more :< */
5874                 initack->init.num_outbound_streams = init_chk->init.num_inbound_streams;
5875         } else {
5876                 /* I can have what I want :> */
5877                 initack->init.num_outbound_streams = htons(i_want);
5878         }
5879         /* tell him his limit. */
5880         initack->init.num_inbound_streams =
5881             htons(inp->sctp_ep.max_open_streams_intome);
5882
5883         /* adaptation layer indication parameter */
5884         if (inp->sctp_ep.adaptation_layer_indicator_provided) {
5885                 parameter_len = (uint16_t)sizeof(struct sctp_adaptation_layer_indication);
5886                 ali = (struct sctp_adaptation_layer_indication *)(mtod(m, caddr_t)+chunk_len);
5887                 ali->ph.param_type = htons(SCTP_ULP_ADAPTATION);
5888                 ali->ph.param_length = htons(parameter_len);
5889                 ali->indication = htonl(inp->sctp_ep.adaptation_layer_indicator);
5890                 chunk_len += parameter_len;
5891         }
5892
5893         /* ECN parameter */
5894         if (((asoc != NULL) && (asoc->ecn_supported == 1)) ||
5895             ((asoc == NULL) && (inp->ecn_supported == 1))) {
5896                 parameter_len = (uint16_t)sizeof(struct sctp_paramhdr);
5897                 ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
5898                 ph->param_type = htons(SCTP_ECN_CAPABLE);
5899                 ph->param_length = htons(parameter_len);
5900                 chunk_len += parameter_len;
5901         }
5902
5903         /* PR-SCTP supported parameter */
5904         if (((asoc != NULL) && (asoc->prsctp_supported == 1)) ||
5905             ((asoc == NULL) && (inp->prsctp_supported == 1))) {
5906                 parameter_len = (uint16_t)sizeof(struct sctp_paramhdr);
5907                 ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
5908                 ph->param_type = htons(SCTP_PRSCTP_SUPPORTED);
5909                 ph->param_length = htons(parameter_len);
5910                 chunk_len += parameter_len;
5911         }
5912
5913         /* Add NAT friendly parameter */
5914         if (nat_friendly) {
5915                 parameter_len = (uint16_t)sizeof(struct sctp_paramhdr);
5916                 ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
5917                 ph->param_type = htons(SCTP_HAS_NAT_SUPPORT);
5918                 ph->param_length = htons(parameter_len);
5919                 chunk_len += parameter_len;
5920         }
5921
5922         /* And now tell the peer which extensions we support */
5923         num_ext = 0;
5924         pr_supported = (struct sctp_supported_chunk_types_param *)(mtod(m, caddr_t)+chunk_len);
5925         if (((asoc != NULL) && (asoc->prsctp_supported == 1)) ||
5926             ((asoc == NULL) && (inp->prsctp_supported == 1))) {
5927                 pr_supported->chunk_types[num_ext++] = SCTP_FORWARD_CUM_TSN;
5928                 if (((asoc != NULL) && (asoc->idata_supported == 1)) ||
5929                     ((asoc == NULL) && (inp->idata_supported == 1))) {
5930                         pr_supported->chunk_types[num_ext++] = SCTP_IFORWARD_CUM_TSN;
5931                 }
5932         }
5933         if (((asoc != NULL) && (asoc->auth_supported == 1)) ||
5934             ((asoc == NULL) && (inp->auth_supported == 1))) {
5935                 pr_supported->chunk_types[num_ext++] = SCTP_AUTHENTICATION;
5936         }
5937         if (((asoc != NULL) && (asoc->asconf_supported == 1)) ||
5938             ((asoc == NULL) && (inp->asconf_supported == 1))) {
5939                 pr_supported->chunk_types[num_ext++] = SCTP_ASCONF;
5940                 pr_supported->chunk_types[num_ext++] = SCTP_ASCONF_ACK;
5941         }
5942         if (((asoc != NULL) && (asoc->reconfig_supported == 1)) ||
5943             ((asoc == NULL) && (inp->reconfig_supported == 1))) {
5944                 pr_supported->chunk_types[num_ext++] = SCTP_STREAM_RESET;
5945         }
5946         if (((asoc != NULL) && (asoc->idata_supported == 1)) ||
5947             ((asoc == NULL) && (inp->idata_supported == 1))) {
5948                 pr_supported->chunk_types[num_ext++] = SCTP_IDATA;
5949         }
5950         if (((asoc != NULL) && (asoc->nrsack_supported == 1)) ||
5951             ((asoc == NULL) && (inp->nrsack_supported == 1))) {
5952                 pr_supported->chunk_types[num_ext++] = SCTP_NR_SELECTIVE_ACK;
5953         }
5954         if (((asoc != NULL) && (asoc->pktdrop_supported == 1)) ||
5955             ((asoc == NULL) && (inp->pktdrop_supported == 1))) {
5956                 pr_supported->chunk_types[num_ext++] = SCTP_PACKET_DROPPED;
5957         }
5958         if (num_ext > 0) {
5959                 parameter_len = (uint16_t)sizeof(struct sctp_supported_chunk_types_param) + num_ext;
5960                 pr_supported->ph.param_type = htons(SCTP_SUPPORTED_CHUNK_EXT);
5961                 pr_supported->ph.param_length = htons(parameter_len);
5962                 padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
5963                 chunk_len += parameter_len;
5964         }
5965
5966         /* add authentication parameters */
5967         if (((asoc != NULL) && (asoc->auth_supported == 1)) ||
5968             ((asoc == NULL) && (inp->auth_supported == 1))) {
5969                 struct sctp_auth_random *randp;
5970                 struct sctp_auth_hmac_algo *hmacs;
5971                 struct sctp_auth_chunk_list *chunks;
5972
5973                 if (padding_len > 0) {
5974                         memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
5975                         chunk_len += padding_len;
5976                         padding_len = 0;
5977                 }
5978                 /* generate and add RANDOM parameter */
5979                 randp = (struct sctp_auth_random *)(mtod(m, caddr_t)+chunk_len);
5980                 parameter_len = (uint16_t)sizeof(struct sctp_auth_random) +
5981                     SCTP_AUTH_RANDOM_SIZE_DEFAULT;
5982                 randp->ph.param_type = htons(SCTP_RANDOM);
5983                 randp->ph.param_length = htons(parameter_len);
5984                 SCTP_READ_RANDOM(randp->random_data, SCTP_AUTH_RANDOM_SIZE_DEFAULT);
5985                 padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
5986                 chunk_len += parameter_len;
5987
5988                 if (padding_len > 0) {
5989                         memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
5990                         chunk_len += padding_len;
5991                         padding_len = 0;
5992                 }
5993                 /* add HMAC_ALGO parameter */
5994                 hmacs = (struct sctp_auth_hmac_algo *)(mtod(m, caddr_t)+chunk_len);
5995                 parameter_len = (uint16_t)sizeof(struct sctp_auth_hmac_algo) +
5996                     sctp_serialize_hmaclist(inp->sctp_ep.local_hmacs,
5997                     (uint8_t *)hmacs->hmac_ids);
5998                 hmacs->ph.param_type = htons(SCTP_HMAC_LIST);
5999                 hmacs->ph.param_length = htons(parameter_len);
6000                 padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
6001                 chunk_len += parameter_len;
6002
6003                 if (padding_len > 0) {
6004                         memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
6005                         chunk_len += padding_len;
6006                         padding_len = 0;
6007                 }
6008                 /* add CHUNKS parameter */
6009                 chunks = (struct sctp_auth_chunk_list *)(mtod(m, caddr_t)+chunk_len);
6010                 parameter_len = (uint16_t)sizeof(struct sctp_auth_chunk_list) +
6011                     sctp_serialize_auth_chunks(inp->sctp_ep.local_auth_chunks,
6012                     chunks->chunk_types);
6013                 chunks->ph.param_type = htons(SCTP_CHUNK_LIST);
6014                 chunks->ph.param_length = htons(parameter_len);
6015                 padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
6016                 chunk_len += parameter_len;
6017         }
6018         SCTP_BUF_LEN(m) = chunk_len;
6019         m_last = m;
6020         /* now the addresses */
6021         /*
6022          * To optimize this we could put the scoping stuff into a structure
6023          * and remove the individual uint8's from the stc structure. Then we
6024          * could just sifa in the address within the stc.. but for now this
6025          * is a quick hack to get the address stuff teased apart.
6026          */
6027         scp.ipv4_addr_legal = stc.ipv4_addr_legal;
6028         scp.ipv6_addr_legal = stc.ipv6_addr_legal;
6029         scp.loopback_scope = stc.loopback_scope;
6030         scp.ipv4_local_scope = stc.ipv4_scope;
6031         scp.local_scope = stc.local_scope;
6032         scp.site_scope = stc.site_scope;
6033         m_last = sctp_add_addresses_to_i_ia(inp, stcb, &scp, m_last,
6034             cnt_inits_to,
6035             &padding_len, &chunk_len);
6036         /* padding_len can only be positive, if no addresses have been added */
6037         if (padding_len > 0) {
6038                 memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
6039                 chunk_len += padding_len;
6040                 SCTP_BUF_LEN(m) += padding_len;
6041                 padding_len = 0;
6042         }
6043
6044         /* tack on the operational error if present */
6045         if (op_err) {
6046                 parameter_len = 0;
6047                 for (m_tmp = op_err; m_tmp != NULL; m_tmp = SCTP_BUF_NEXT(m_tmp)) {
6048                         parameter_len += SCTP_BUF_LEN(m_tmp);
6049                 }
6050                 padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
6051                 SCTP_BUF_NEXT(m_last) = op_err;
6052                 while (SCTP_BUF_NEXT(m_last) != NULL) {
6053                         m_last = SCTP_BUF_NEXT(m_last);
6054                 }
6055                 chunk_len += parameter_len;
6056         }
6057         if (padding_len > 0) {
6058                 m_last = sctp_add_pad_tombuf(m_last, padding_len);
6059                 if (m_last == NULL) {
6060                         /* Houston we have a problem, no space */
6061                         sctp_m_freem(m);
6062                         return;
6063                 }
6064                 chunk_len += padding_len;
6065                 padding_len = 0;
6066         }
6067         /* Now we must build a cookie */
6068         m_cookie = sctp_add_cookie(init_pkt, offset, m, 0, &stc, &signature);
6069         if (m_cookie == NULL) {
6070                 /* memory problem */
6071                 sctp_m_freem(m);
6072                 return;
6073         }
6074         /* Now append the cookie to the end and update the space/size */
6075         SCTP_BUF_NEXT(m_last) = m_cookie;
6076         parameter_len = 0;
6077         for (m_tmp = m_cookie; m_tmp != NULL; m_tmp = SCTP_BUF_NEXT(m_tmp)) {
6078                 parameter_len += SCTP_BUF_LEN(m_tmp);
6079                 if (SCTP_BUF_NEXT(m_tmp) == NULL) {
6080                         m_last = m_tmp;
6081                 }
6082         }
6083         padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
6084         chunk_len += parameter_len;
6085
6086         /*
6087          * Place in the size, but we don't include the last pad (if any) in
6088          * the INIT-ACK.
6089          */
6090         initack->ch.chunk_length = htons(chunk_len);
6091
6092         /*
6093          * Time to sign the cookie, we don't sign over the cookie signature
6094          * though thus we set trailer.
6095          */
6096         (void)sctp_hmac_m(SCTP_HMAC,
6097             (uint8_t *)inp->sctp_ep.secret_key[(int)(inp->sctp_ep.current_secret_number)],
6098             SCTP_SECRET_SIZE, m_cookie, sizeof(struct sctp_paramhdr),
6099             (uint8_t *)signature, SCTP_SIGNATURE_SIZE);
6100         /*
6101          * We sifa 0 here to NOT set IP_DF if its IPv4, we ignore the return
6102          * here since the timer will drive a retranmission.
6103          */
6104         if (padding_len > 0) {
6105                 if (sctp_add_pad_tombuf(m_last, padding_len) == NULL) {
6106                         sctp_m_freem(m);
6107                         return;
6108                 }
6109         }
6110         if (stc.loopback_scope) {
6111                 over_addr = (union sctp_sockstore *)dst;
6112         } else {
6113                 over_addr = NULL;
6114         }
6115
6116         if ((error = sctp_lowlevel_chunk_output(inp, NULL, NULL, to, m, 0, NULL, 0, 0,
6117             0, 0,
6118             inp->sctp_lport, sh->src_port, init_chk->init.initiate_tag,
6119             port, over_addr,
6120             mflowtype, mflowid,
6121             SCTP_SO_NOT_LOCKED))) {
6122                 SCTPDBG(SCTP_DEBUG_OUTPUT4, "Gak send error %d\n", error);
6123                 if (error == ENOBUFS) {
6124                         if (asoc != NULL) {
6125                                 asoc->ifp_had_enobuf = 1;
6126                         }
6127                         SCTP_STAT_INCR(sctps_lowlevelerr);
6128                 }
6129         } else {
6130                 if (asoc != NULL) {
6131                         asoc->ifp_had_enobuf = 0;
6132                 }
6133         }
6134         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
6135 }
6136
6137 static void
6138 sctp_prune_prsctp(struct sctp_tcb *stcb,
6139     struct sctp_association *asoc,
6140     struct sctp_sndrcvinfo *srcv,
6141     int dataout)
6142 {
6143         int freed_spc = 0;
6144         struct sctp_tmit_chunk *chk, *nchk;
6145
6146         SCTP_TCB_LOCK_ASSERT(stcb);
6147         if ((asoc->prsctp_supported) &&
6148             (asoc->sent_queue_cnt_removeable > 0)) {
6149                 TAILQ_FOREACH(chk, &asoc->sent_queue, sctp_next) {
6150                         /*
6151                          * Look for chunks marked with the PR_SCTP flag AND
6152                          * the buffer space flag. If the one being sent is
6153                          * equal or greater priority then purge the old one
6154                          * and free some space.
6155                          */
6156                         if (PR_SCTP_BUF_ENABLED(chk->flags)) {
6157                                 /*
6158                                  * This one is PR-SCTP AND buffer space
6159                                  * limited type
6160                                  */
6161                                 if (chk->rec.data.timetodrop.tv_sec > (long)srcv->sinfo_timetolive) {
6162                                         /*
6163                                          * Lower numbers equates to higher
6164                                          * priority. So if the one we are
6165                                          * looking at has a larger priority,
6166                                          * we want to drop the data and NOT
6167                                          * retransmit it.
6168                                          */
6169                                         if (chk->data) {
6170                                                 /*
6171                                                  * We release the book_size
6172                                                  * if the mbuf is here
6173                                                  */
6174                                                 int ret_spc;
6175                                                 uint8_t sent;
6176
6177                                                 if (chk->sent > SCTP_DATAGRAM_UNSENT)
6178                                                         sent = 1;
6179                                                 else
6180                                                         sent = 0;
6181                                                 ret_spc = sctp_release_pr_sctp_chunk(stcb, chk,
6182                                                     sent,
6183                                                     SCTP_SO_LOCKED);
6184                                                 freed_spc += ret_spc;
6185                                                 if (freed_spc >= dataout) {
6186                                                         return;
6187                                                 }
6188                                         }       /* if chunk was present */
6189                                 }       /* if of sufficient priority */
6190                         }       /* if chunk has enabled */
6191                 }               /* tailqforeach */
6192
6193                 TAILQ_FOREACH_SAFE(chk, &asoc->send_queue, sctp_next, nchk) {
6194                         /* Here we must move to the sent queue and mark */
6195                         if (PR_SCTP_BUF_ENABLED(chk->flags)) {
6196                                 if (chk->rec.data.timetodrop.tv_sec > (long)srcv->sinfo_timetolive) {
6197                                         if (chk->data) {
6198                                                 /*
6199                                                  * We release the book_size
6200                                                  * if the mbuf is here
6201                                                  */
6202                                                 int ret_spc;
6203
6204                                                 ret_spc = sctp_release_pr_sctp_chunk(stcb, chk,
6205                                                     0, SCTP_SO_LOCKED);
6206
6207                                                 freed_spc += ret_spc;
6208                                                 if (freed_spc >= dataout) {
6209                                                         return;
6210                                                 }
6211                                         }       /* end if chk->data */
6212                                 }       /* end if right class */
6213                         }       /* end if chk pr-sctp */
6214                 }               /* tailqforeachsafe (chk) */
6215         }                       /* if enabled in asoc */
6216 }
6217
6218 uint32_t
6219 sctp_get_frag_point(struct sctp_tcb *stcb)
6220 {
6221         struct sctp_association *asoc;
6222         uint32_t frag_point, overhead;
6223
6224         asoc = &stcb->asoc;
6225         /* Consider IP header and SCTP common header. */
6226         if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
6227                 overhead = SCTP_MIN_OVERHEAD;
6228         } else {
6229                 overhead = SCTP_MIN_V4_OVERHEAD;
6230         }
6231         /* Consider DATA/IDATA chunk header and AUTH header, if needed. */
6232         if (asoc->idata_supported) {
6233                 overhead += sizeof(struct sctp_idata_chunk);
6234                 if (sctp_auth_is_required_chunk(SCTP_IDATA, asoc->peer_auth_chunks)) {
6235                         overhead += sctp_get_auth_chunk_len(asoc->peer_hmac_id);
6236                 }
6237         } else {
6238                 overhead += sizeof(struct sctp_data_chunk);
6239                 if (sctp_auth_is_required_chunk(SCTP_DATA, asoc->peer_auth_chunks)) {
6240                         overhead += sctp_get_auth_chunk_len(asoc->peer_hmac_id);
6241                 }
6242         }
6243         KASSERT(overhead % 4 == 0,
6244             ("overhead (%u) not a multiple of 4", overhead));
6245         /* Consider padding. */
6246         if (asoc->smallest_mtu % 4 > 0) {
6247                 overhead += (asoc->smallest_mtu % 4);
6248         }
6249         KASSERT(asoc->smallest_mtu > overhead,
6250             ("Association MTU (%u) too small for overhead (%u)",
6251             asoc->smallest_mtu, overhead));
6252         frag_point = asoc->smallest_mtu - overhead;
6253         KASSERT(frag_point % 4 == 0,
6254             ("frag_point (%u) not a multiple of 4", frag_point));
6255         /* Honor MAXSEG socket option. */
6256         if ((asoc->sctp_frag_point > 0) &&
6257             (asoc->sctp_frag_point < frag_point)) {
6258                 frag_point = asoc->sctp_frag_point;
6259         }
6260         return (frag_point);
6261 }
6262
6263 static void
6264 sctp_set_prsctp_policy(struct sctp_stream_queue_pending *sp)
6265 {
6266         /*
6267          * We assume that the user wants PR_SCTP_TTL if the user provides a
6268          * positive lifetime but does not specify any PR_SCTP policy.
6269          */
6270         if (PR_SCTP_ENABLED(sp->sinfo_flags)) {
6271                 sp->act_flags |= PR_SCTP_POLICY(sp->sinfo_flags);
6272         } else if (sp->timetolive > 0) {
6273                 sp->sinfo_flags |= SCTP_PR_SCTP_TTL;
6274                 sp->act_flags |= PR_SCTP_POLICY(sp->sinfo_flags);
6275         } else {
6276                 return;
6277         }
6278         switch (PR_SCTP_POLICY(sp->sinfo_flags)) {
6279         case CHUNK_FLAGS_PR_SCTP_BUF:
6280                 /*
6281                  * Time to live is a priority stored in tv_sec when doing
6282                  * the buffer drop thing.
6283                  */
6284                 sp->ts.tv_sec = sp->timetolive;
6285                 sp->ts.tv_usec = 0;
6286                 break;
6287         case CHUNK_FLAGS_PR_SCTP_TTL:
6288                 {
6289                         struct timeval tv;
6290
6291                         (void)SCTP_GETTIME_TIMEVAL(&sp->ts);
6292                         tv.tv_sec = sp->timetolive / 1000;
6293                         tv.tv_usec = (sp->timetolive * 1000) % 1000000;
6294                         /*
6295                          * TODO sctp_constants.h needs alternative time
6296                          * macros when _KERNEL is undefined.
6297                          */
6298                         timevaladd(&sp->ts, &tv);
6299                 }
6300                 break;
6301         case CHUNK_FLAGS_PR_SCTP_RTX:
6302                 /*
6303                  * Time to live is a the number or retransmissions stored in
6304                  * tv_sec.
6305                  */
6306                 sp->ts.tv_sec = sp->timetolive;
6307                 sp->ts.tv_usec = 0;
6308                 break;
6309         default:
6310                 SCTPDBG(SCTP_DEBUG_USRREQ1,
6311                     "Unknown PR_SCTP policy %u.\n",
6312                     PR_SCTP_POLICY(sp->sinfo_flags));
6313                 break;
6314         }
6315 }
6316
6317 static int
6318 sctp_msg_append(struct sctp_tcb *stcb,
6319     struct sctp_nets *net,
6320     struct mbuf *m,
6321     struct sctp_sndrcvinfo *srcv)
6322 {
6323         int error = 0;
6324         struct mbuf *at;
6325         struct sctp_stream_queue_pending *sp = NULL;
6326         struct sctp_stream_out *strm;
6327
6328         SCTP_TCB_LOCK_ASSERT(stcb);
6329
6330         /*
6331          * Given an mbuf chain, put it into the association send queue and
6332          * place it on the wheel
6333          */
6334         if (srcv->sinfo_stream >= stcb->asoc.streamoutcnt) {
6335                 /* Invalid stream number */
6336                 SCTP_LTRACE_ERR_RET_PKT(m, NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
6337                 error = EINVAL;
6338                 goto out_now;
6339         }
6340         if ((stcb->asoc.stream_locked) &&
6341             (stcb->asoc.stream_locked_on != srcv->sinfo_stream)) {
6342                 SCTP_LTRACE_ERR_RET_PKT(m, NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
6343                 error = EINVAL;
6344                 goto out_now;
6345         }
6346         /* Now can we send this? */
6347         if ((SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_SENT) ||
6348             (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_ACK_SENT) ||
6349             (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_RECEIVED) ||
6350             (stcb->asoc.state & SCTP_STATE_SHUTDOWN_PENDING)) {
6351                 /* got data while shutting down */
6352                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
6353                 error = ECONNRESET;
6354                 goto out_now;
6355         }
6356         sctp_alloc_a_strmoq(stcb, sp);
6357         if (sp == NULL) {
6358                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
6359                 error = ENOMEM;
6360                 goto out_now;
6361         }
6362         sp->sinfo_flags = srcv->sinfo_flags;
6363         sp->timetolive = srcv->sinfo_timetolive;
6364         sp->ppid = srcv->sinfo_ppid;
6365         sp->context = srcv->sinfo_context;
6366         sp->fsn = 0;
6367         if (sp->sinfo_flags & SCTP_ADDR_OVER) {
6368                 sp->net = net;
6369                 atomic_add_int(&sp->net->ref_count, 1);
6370         } else {
6371                 sp->net = NULL;
6372         }
6373         (void)SCTP_GETTIME_TIMEVAL(&sp->ts);
6374         sp->sid = srcv->sinfo_stream;
6375         sp->msg_is_complete = 1;
6376         sp->sender_all_done = 1;
6377         sp->some_taken = 0;
6378         sp->data = m;
6379         sp->tail_mbuf = NULL;
6380         sctp_set_prsctp_policy(sp);
6381         /*
6382          * We could in theory (for sendall) sifa the length in, but we would
6383          * still have to hunt through the chain since we need to setup the
6384          * tail_mbuf
6385          */
6386         sp->length = 0;
6387         for (at = m; at; at = SCTP_BUF_NEXT(at)) {
6388                 if (SCTP_BUF_NEXT(at) == NULL)
6389                         sp->tail_mbuf = at;
6390                 sp->length += SCTP_BUF_LEN(at);
6391         }
6392         if (srcv->sinfo_keynumber_valid) {
6393                 sp->auth_keyid = srcv->sinfo_keynumber;
6394         } else {
6395                 sp->auth_keyid = stcb->asoc.authinfo.active_keyid;
6396         }
6397         if (sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks)) {
6398                 sctp_auth_key_acquire(stcb, sp->auth_keyid);
6399                 sp->holds_key_ref = 1;
6400         }
6401         strm = &stcb->asoc.strmout[srcv->sinfo_stream];
6402         sctp_snd_sb_alloc(stcb, sp->length);
6403         atomic_add_int(&stcb->asoc.stream_queue_cnt, 1);
6404         TAILQ_INSERT_TAIL(&strm->outqueue, sp, next);
6405         stcb->asoc.ss_functions.sctp_ss_add_to_stream(stcb, &stcb->asoc, strm, sp);
6406         m = NULL;
6407 out_now:
6408         if (m) {
6409                 sctp_m_freem(m);
6410         }
6411         return (error);
6412 }
6413
6414 static struct mbuf *
6415 sctp_copy_mbufchain(struct mbuf *clonechain,
6416     struct mbuf *outchain,
6417     struct mbuf **endofchain,
6418     int can_take_mbuf,
6419     int sizeofcpy,
6420     uint8_t copy_by_ref)
6421 {
6422         struct mbuf *m;
6423         struct mbuf *appendchain;
6424         caddr_t cp;
6425         int len;
6426
6427         if (endofchain == NULL) {
6428                 /* error */
6429 error_out:
6430                 if (outchain)
6431                         sctp_m_freem(outchain);
6432                 return (NULL);
6433         }
6434         if (can_take_mbuf) {
6435                 appendchain = clonechain;
6436         } else {
6437                 if (!copy_by_ref &&
6438                     (sizeofcpy <= (int)((((SCTP_BASE_SYSCTL(sctp_mbuf_threshold_count) - 1) * MLEN) + MHLEN)))) {
6439                         /* Its not in a cluster */
6440                         if (*endofchain == NULL) {
6441                                 /* lets get a mbuf cluster */
6442                                 if (outchain == NULL) {
6443                                         /* This is the general case */
6444                         new_mbuf:
6445                                         outchain = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_HEADER);
6446                                         if (outchain == NULL) {
6447                                                 goto error_out;
6448                                         }
6449                                         SCTP_BUF_LEN(outchain) = 0;
6450                                         *endofchain = outchain;
6451                                         /* get the prepend space */
6452                                         SCTP_BUF_RESV_UF(outchain, (SCTP_FIRST_MBUF_RESV + 4));
6453                                 } else {
6454                                         /*
6455                                          * We really should not get a NULL
6456                                          * in endofchain
6457                                          */
6458                                         /* find end */
6459                                         m = outchain;
6460                                         while (m) {
6461                                                 if (SCTP_BUF_NEXT(m) == NULL) {
6462                                                         *endofchain = m;
6463                                                         break;
6464                                                 }
6465                                                 m = SCTP_BUF_NEXT(m);
6466                                         }
6467                                         /* sanity */
6468                                         if (*endofchain == NULL) {
6469                                                 /*
6470                                                  * huh, TSNH XXX maybe we
6471                                                  * should panic
6472                                                  */
6473                                                 sctp_m_freem(outchain);
6474                                                 goto new_mbuf;
6475                                         }
6476                                 }
6477                                 /* get the new end of length */
6478                                 len = (int)M_TRAILINGSPACE(*endofchain);
6479                         } else {
6480                                 /* how much is left at the end? */
6481                                 len = (int)M_TRAILINGSPACE(*endofchain);
6482                         }
6483                         /* Find the end of the data, for appending */
6484                         cp = (mtod((*endofchain), caddr_t)+SCTP_BUF_LEN((*endofchain)));
6485
6486                         /* Now lets copy it out */
6487                         if (len >= sizeofcpy) {
6488                                 /* It all fits, copy it in */
6489                                 m_copydata(clonechain, 0, sizeofcpy, cp);
6490                                 SCTP_BUF_LEN((*endofchain)) += sizeofcpy;
6491                         } else {
6492                                 /* fill up the end of the chain */
6493                                 if (len > 0) {
6494                                         m_copydata(clonechain, 0, len, cp);
6495                                         SCTP_BUF_LEN((*endofchain)) += len;
6496                                         /* now we need another one */
6497                                         sizeofcpy -= len;
6498                                 }
6499                                 m = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_HEADER);
6500                                 if (m == NULL) {
6501                                         /* We failed */
6502                                         goto error_out;
6503                                 }
6504                                 SCTP_BUF_NEXT((*endofchain)) = m;
6505                                 *endofchain = m;
6506                                 cp = mtod((*endofchain), caddr_t);
6507                                 m_copydata(clonechain, len, sizeofcpy, cp);
6508                                 SCTP_BUF_LEN((*endofchain)) += sizeofcpy;
6509                         }
6510                         return (outchain);
6511                 } else {
6512                         /* copy the old fashion way */
6513                         appendchain = SCTP_M_COPYM(clonechain, 0, M_COPYALL, M_NOWAIT);
6514 #ifdef SCTP_MBUF_LOGGING
6515                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
6516                                 sctp_log_mbc(appendchain, SCTP_MBUF_ICOPY);
6517                         }
6518 #endif
6519                 }
6520         }
6521         if (appendchain == NULL) {
6522                 /* error */
6523                 if (outchain)
6524                         sctp_m_freem(outchain);
6525                 return (NULL);
6526         }
6527         if (outchain) {
6528                 /* tack on to the end */
6529                 if (*endofchain != NULL) {
6530                         SCTP_BUF_NEXT(((*endofchain))) = appendchain;
6531                 } else {
6532                         m = outchain;
6533                         while (m) {
6534                                 if (SCTP_BUF_NEXT(m) == NULL) {
6535                                         SCTP_BUF_NEXT(m) = appendchain;
6536                                         break;
6537                                 }
6538                                 m = SCTP_BUF_NEXT(m);
6539                         }
6540                 }
6541                 /*
6542                  * save off the end and update the end-chain position
6543                  */
6544                 m = appendchain;
6545                 while (m) {
6546                         if (SCTP_BUF_NEXT(m) == NULL) {
6547                                 *endofchain = m;
6548                                 break;
6549                         }
6550                         m = SCTP_BUF_NEXT(m);
6551                 }
6552                 return (outchain);
6553         } else {
6554                 /* save off the end and update the end-chain position */
6555                 m = appendchain;
6556                 while (m) {
6557                         if (SCTP_BUF_NEXT(m) == NULL) {
6558                                 *endofchain = m;
6559                                 break;
6560                         }
6561                         m = SCTP_BUF_NEXT(m);
6562                 }
6563                 return (appendchain);
6564         }
6565 }
6566
6567 static int
6568 sctp_med_chunk_output(struct sctp_inpcb *inp,
6569     struct sctp_tcb *stcb,
6570     struct sctp_association *asoc,
6571     int *num_out,
6572     int *reason_code,
6573     int control_only, int from_where,
6574     struct timeval *now, int *now_filled,
6575     uint32_t frag_point, int so_locked);
6576
6577 static void
6578 sctp_sendall_iterator(struct sctp_inpcb *inp, struct sctp_tcb *stcb, void *ptr,
6579     uint32_t val SCTP_UNUSED)
6580 {
6581         struct sctp_copy_all *ca;
6582         struct mbuf *m;
6583         int ret = 0;
6584         int added_control = 0;
6585         int un_sent, do_chunk_output = 1;
6586         struct sctp_association *asoc;
6587         struct sctp_nets *net;
6588
6589         ca = (struct sctp_copy_all *)ptr;
6590         if (ca->m == NULL) {
6591                 return;
6592         }
6593         if (ca->inp != inp) {
6594                 /* TSNH */
6595                 return;
6596         }
6597         if (ca->sndlen > 0) {
6598                 m = SCTP_M_COPYM(ca->m, 0, M_COPYALL, M_NOWAIT);
6599                 if (m == NULL) {
6600                         /* can't copy so we are done */
6601                         ca->cnt_failed++;
6602                         return;
6603                 }
6604 #ifdef SCTP_MBUF_LOGGING
6605                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
6606                         sctp_log_mbc(m, SCTP_MBUF_ICOPY);
6607                 }
6608 #endif
6609         } else {
6610                 m = NULL;
6611         }
6612         SCTP_TCB_LOCK_ASSERT(stcb);
6613         if (stcb->asoc.alternate) {
6614                 net = stcb->asoc.alternate;
6615         } else {
6616                 net = stcb->asoc.primary_destination;
6617         }
6618         if (ca->sndrcv.sinfo_flags & SCTP_ABORT) {
6619                 /* Abort this assoc with m as the user defined reason */
6620                 if (m != NULL) {
6621                         SCTP_BUF_PREPEND(m, sizeof(struct sctp_paramhdr), M_NOWAIT);
6622                 } else {
6623                         m = sctp_get_mbuf_for_msg(sizeof(struct sctp_paramhdr),
6624                             0, M_NOWAIT, 1, MT_DATA);
6625                         SCTP_BUF_LEN(m) = sizeof(struct sctp_paramhdr);
6626                 }
6627                 if (m != NULL) {
6628                         struct sctp_paramhdr *ph;
6629
6630                         ph = mtod(m, struct sctp_paramhdr *);
6631                         ph->param_type = htons(SCTP_CAUSE_USER_INITIATED_ABT);
6632                         ph->param_length = htons((uint16_t)(sizeof(struct sctp_paramhdr) + ca->sndlen));
6633                 }
6634                 /*
6635                  * We add one here to keep the assoc from dis-appearing on
6636                  * us.
6637                  */
6638                 atomic_add_int(&stcb->asoc.refcnt, 1);
6639                 sctp_abort_an_association(inp, stcb, m, false, SCTP_SO_NOT_LOCKED);
6640                 /*
6641                  * sctp_abort_an_association calls sctp_free_asoc() free
6642                  * association will NOT free it since we incremented the
6643                  * refcnt .. we do this to prevent it being freed and things
6644                  * getting tricky since we could end up (from free_asoc)
6645                  * calling inpcb_free which would get a recursive lock call
6646                  * to the iterator lock.. But as a consequence of that the
6647                  * stcb will return to us un-locked.. since free_asoc
6648                  * returns with either no TCB or the TCB unlocked, we must
6649                  * relock.. to unlock in the iterator timer :-0
6650                  */
6651                 SCTP_TCB_LOCK(stcb);
6652                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
6653                 goto no_chunk_output;
6654         } else {
6655                 if (m != NULL) {
6656                         ret = sctp_msg_append(stcb, net, m, &ca->sndrcv);
6657                 }
6658                 asoc = &stcb->asoc;
6659                 if (ca->sndrcv.sinfo_flags & SCTP_EOF) {
6660                         /* shutdown this assoc */
6661                         if (TAILQ_EMPTY(&asoc->send_queue) &&
6662                             TAILQ_EMPTY(&asoc->sent_queue) &&
6663                             sctp_is_there_unsent_data(stcb, SCTP_SO_NOT_LOCKED) == 0) {
6664                                 if ((*asoc->ss_functions.sctp_ss_is_user_msgs_incomplete) (stcb, asoc)) {
6665                                         goto abort_anyway;
6666                                 }
6667                                 /*
6668                                  * there is nothing queued to send, so I'm
6669                                  * done...
6670                                  */
6671                                 if ((SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_SENT) &&
6672                                     (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
6673                                     (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
6674                                         /*
6675                                          * only send SHUTDOWN the first time
6676                                          * through
6677                                          */
6678                                         if (SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) {
6679                                                 SCTP_STAT_DECR_GAUGE32(sctps_currestab);
6680                                         }
6681                                         SCTP_SET_STATE(stcb, SCTP_STATE_SHUTDOWN_SENT);
6682                                         sctp_stop_timers_for_shutdown(stcb);
6683                                         sctp_send_shutdown(stcb, net);
6684                                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb,
6685                                             net);
6686                                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
6687                                             NULL);
6688                                         added_control = 1;
6689                                         do_chunk_output = 0;
6690                                 }
6691                         } else {
6692                                 /*
6693                                  * we still got (or just got) data to send,
6694                                  * so set SHUTDOWN_PENDING
6695                                  */
6696                                 /*
6697                                  * XXX sockets draft says that SCTP_EOF
6698                                  * should be sent with no data.  currently,
6699                                  * we will allow user data to be sent first
6700                                  * and move to SHUTDOWN-PENDING
6701                                  */
6702                                 if ((SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_SENT) &&
6703                                     (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
6704                                     (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
6705                                         if ((*asoc->ss_functions.sctp_ss_is_user_msgs_incomplete) (stcb, asoc)) {
6706                                                 SCTP_ADD_SUBSTATE(stcb, SCTP_STATE_PARTIAL_MSG_LEFT);
6707                                         }
6708                                         SCTP_ADD_SUBSTATE(stcb, SCTP_STATE_SHUTDOWN_PENDING);
6709                                         if (TAILQ_EMPTY(&asoc->send_queue) &&
6710                                             TAILQ_EMPTY(&asoc->sent_queue) &&
6711                                             (asoc->state & SCTP_STATE_PARTIAL_MSG_LEFT)) {
6712                                                 struct mbuf *op_err;
6713                                                 char msg[SCTP_DIAG_INFO_LEN];
6714
6715                                 abort_anyway:
6716                                                 SCTP_SNPRINTF(msg, sizeof(msg),
6717                                                     "%s:%d at %s", __FILE__, __LINE__, __func__);
6718                                                 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
6719                                                     msg);
6720                                                 atomic_add_int(&stcb->asoc.refcnt, 1);
6721                                                 sctp_abort_an_association(stcb->sctp_ep, stcb,
6722                                                     op_err, false, SCTP_SO_NOT_LOCKED);
6723                                                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
6724                                                 goto no_chunk_output;
6725                                         }
6726                                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
6727                                             NULL);
6728                                 }
6729                         }
6730                 }
6731         }
6732         un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
6733             (stcb->asoc.stream_queue_cnt * SCTP_DATA_CHUNK_OVERHEAD(stcb)));
6734
6735         if ((sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY)) &&
6736             (stcb->asoc.total_flight > 0) &&
6737             (un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD))) {
6738                 do_chunk_output = 0;
6739         }
6740         if (do_chunk_output)
6741                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_NOT_LOCKED);
6742         else if (added_control) {
6743                 struct timeval now;
6744                 int num_out, reason, now_filled = 0;
6745
6746                 (void)sctp_med_chunk_output(inp, stcb, &stcb->asoc, &num_out,
6747                     &reason, 1, 1, &now, &now_filled,
6748                     sctp_get_frag_point(stcb),
6749                     SCTP_SO_NOT_LOCKED);
6750         }
6751 no_chunk_output:
6752         if (ret) {
6753                 ca->cnt_failed++;
6754         } else {
6755                 ca->cnt_sent++;
6756         }
6757 }
6758
6759 static void
6760 sctp_sendall_completes(void *ptr, uint32_t val SCTP_UNUSED)
6761 {
6762         struct sctp_copy_all *ca;
6763
6764         ca = (struct sctp_copy_all *)ptr;
6765         /*
6766          * Do a notify here? Kacheong suggests that the notify be done at
6767          * the send time.. so you would push up a notification if any send
6768          * failed. Don't know if this is feasible since the only failures we
6769          * have is "memory" related and if you cannot get an mbuf to send
6770          * the data you surely can't get an mbuf to send up to notify the
6771          * user you can't send the data :->
6772          */
6773
6774         /* now free everything */
6775         if (ca->inp) {
6776                 /* Lets clear the flag to allow others to run. */
6777                 SCTP_INP_WLOCK(ca->inp);
6778                 ca->inp->sctp_flags &= ~SCTP_PCB_FLAGS_SND_ITERATOR_UP;
6779                 SCTP_INP_WUNLOCK(ca->inp);
6780         }
6781         sctp_m_freem(ca->m);
6782         SCTP_FREE(ca, SCTP_M_COPYAL);
6783 }
6784
6785 static struct mbuf *
6786 sctp_copy_out_all(struct uio *uio, ssize_t len)
6787 {
6788         struct mbuf *ret, *at;
6789         ssize_t left, willcpy, cancpy, error;
6790
6791         ret = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_WAITOK, 1, MT_DATA);
6792         if (ret == NULL) {
6793                 /* TSNH */
6794                 return (NULL);
6795         }
6796         left = len;
6797         SCTP_BUF_LEN(ret) = 0;
6798         /* save space for the data chunk header */
6799         cancpy = (int)M_TRAILINGSPACE(ret);
6800         willcpy = min(cancpy, left);
6801         at = ret;
6802         while (left > 0) {
6803                 /* Align data to the end */
6804                 error = uiomove(mtod(at, caddr_t), (int)willcpy, uio);
6805                 if (error) {
6806         err_out_now:
6807                         sctp_m_freem(at);
6808                         return (NULL);
6809                 }
6810                 SCTP_BUF_LEN(at) = (int)willcpy;
6811                 SCTP_BUF_NEXT_PKT(at) = SCTP_BUF_NEXT(at) = 0;
6812                 left -= willcpy;
6813                 if (left > 0) {
6814                         SCTP_BUF_NEXT(at) = sctp_get_mbuf_for_msg((unsigned int)left, 0, M_WAITOK, 1, MT_DATA);
6815                         if (SCTP_BUF_NEXT(at) == NULL) {
6816                                 goto err_out_now;
6817                         }
6818                         at = SCTP_BUF_NEXT(at);
6819                         SCTP_BUF_LEN(at) = 0;
6820                         cancpy = (int)M_TRAILINGSPACE(at);
6821                         willcpy = min(cancpy, left);
6822                 }
6823         }
6824         return (ret);
6825 }
6826
6827 static int
6828 sctp_sendall(struct sctp_inpcb *inp, struct uio *uio, struct mbuf *m,
6829     struct sctp_sndrcvinfo *srcv)
6830 {
6831         int ret;
6832         struct sctp_copy_all *ca;
6833
6834         if (uio->uio_resid > (ssize_t)SCTP_BASE_SYSCTL(sctp_sendall_limit)) {
6835                 /* You must not be larger than the limit! */
6836                 return (EMSGSIZE);
6837         }
6838         SCTP_MALLOC(ca, struct sctp_copy_all *, sizeof(struct sctp_copy_all),
6839             SCTP_M_COPYAL);
6840         if (ca == NULL) {
6841                 sctp_m_freem(m);
6842                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
6843                 return (ENOMEM);
6844         }
6845         memset(ca, 0, sizeof(struct sctp_copy_all));
6846
6847         ca->inp = inp;
6848         if (srcv) {
6849                 memcpy(&ca->sndrcv, srcv, sizeof(struct sctp_nonpad_sndrcvinfo));
6850         }
6851
6852         /* Serialize. */
6853         SCTP_INP_WLOCK(inp);
6854         if ((inp->sctp_flags & SCTP_PCB_FLAGS_SND_ITERATOR_UP) != 0) {
6855                 SCTP_INP_WUNLOCK(inp);
6856                 sctp_m_freem(m);
6857                 SCTP_FREE(ca, SCTP_M_COPYAL);
6858                 return (EBUSY);
6859         }
6860         inp->sctp_flags |= SCTP_PCB_FLAGS_SND_ITERATOR_UP;
6861         SCTP_INP_WUNLOCK(inp);
6862
6863         /*
6864          * take off the sendall flag, it would be bad if we failed to do
6865          * this :-0
6866          */
6867         ca->sndrcv.sinfo_flags &= ~SCTP_SENDALL;
6868         /* get length and mbuf chain */
6869         if (uio) {
6870                 ca->sndlen = uio->uio_resid;
6871                 ca->m = sctp_copy_out_all(uio, ca->sndlen);
6872                 if (ca->m == NULL) {
6873                         SCTP_FREE(ca, SCTP_M_COPYAL);
6874                         sctp_m_freem(m);
6875                         SCTP_INP_WLOCK(inp);
6876                         inp->sctp_flags &= ~SCTP_PCB_FLAGS_SND_ITERATOR_UP;
6877                         SCTP_INP_WUNLOCK(inp);
6878                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
6879                         return (ENOMEM);
6880                 }
6881         } else {
6882                 /* Gather the length of the send */
6883                 struct mbuf *mat;
6884
6885                 ca->sndlen = 0;
6886                 for (mat = m; mat; mat = SCTP_BUF_NEXT(mat)) {
6887                         ca->sndlen += SCTP_BUF_LEN(mat);
6888                 }
6889         }
6890         ret = sctp_initiate_iterator(NULL, sctp_sendall_iterator, NULL,
6891             SCTP_PCB_ANY_FLAGS, SCTP_PCB_ANY_FEATURES,
6892             SCTP_ASOC_ANY_STATE,
6893             (void *)ca, 0,
6894             sctp_sendall_completes, inp, 1);
6895         if (ret) {
6896                 SCTP_INP_WLOCK(inp);
6897                 inp->sctp_flags &= ~SCTP_PCB_FLAGS_SND_ITERATOR_UP;
6898                 SCTP_INP_WUNLOCK(inp);
6899                 SCTP_FREE(ca, SCTP_M_COPYAL);
6900                 SCTP_LTRACE_ERR_RET_PKT(m, inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EFAULT);
6901                 return (EFAULT);
6902         }
6903         return (0);
6904 }
6905
6906 void
6907 sctp_toss_old_cookies(struct sctp_tcb *stcb, struct sctp_association *asoc)
6908 {
6909         struct sctp_tmit_chunk *chk, *nchk;
6910
6911         TAILQ_FOREACH_SAFE(chk, &asoc->control_send_queue, sctp_next, nchk) {
6912                 if (chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
6913                         TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
6914                         asoc->ctrl_queue_cnt--;
6915                         if (chk->data) {
6916                                 sctp_m_freem(chk->data);
6917                                 chk->data = NULL;
6918                         }
6919                         sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
6920                 }
6921         }
6922 }
6923
6924 void
6925 sctp_toss_old_asconf(struct sctp_tcb *stcb)
6926 {
6927         struct sctp_association *asoc;
6928         struct sctp_tmit_chunk *chk, *nchk;
6929         struct sctp_asconf_chunk *acp;
6930
6931         asoc = &stcb->asoc;
6932         TAILQ_FOREACH_SAFE(chk, &asoc->asconf_send_queue, sctp_next, nchk) {
6933                 /* find SCTP_ASCONF chunk in queue */
6934                 if (chk->rec.chunk_id.id == SCTP_ASCONF) {
6935                         if (chk->data) {
6936                                 acp = mtod(chk->data, struct sctp_asconf_chunk *);
6937                                 if (SCTP_TSN_GT(ntohl(acp->serial_number), asoc->asconf_seq_out_acked)) {
6938                                         /* Not Acked yet */
6939                                         break;
6940                                 }
6941                         }
6942                         TAILQ_REMOVE(&asoc->asconf_send_queue, chk, sctp_next);
6943                         asoc->ctrl_queue_cnt--;
6944                         if (chk->data) {
6945                                 sctp_m_freem(chk->data);
6946                                 chk->data = NULL;
6947                         }
6948                         sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
6949                 }
6950         }
6951 }
6952
6953 static void
6954 sctp_clean_up_datalist(struct sctp_tcb *stcb,
6955     struct sctp_association *asoc,
6956     struct sctp_tmit_chunk **data_list,
6957     int bundle_at,
6958     struct sctp_nets *net)
6959 {
6960         int i;
6961         struct sctp_tmit_chunk *tp1;
6962
6963         for (i = 0; i < bundle_at; i++) {
6964                 /* off of the send queue */
6965                 TAILQ_REMOVE(&asoc->send_queue, data_list[i], sctp_next);
6966                 asoc->send_queue_cnt--;
6967                 if (i > 0) {
6968                         /*
6969                          * Any chunk NOT 0 you zap the time chunk 0 gets
6970                          * zapped or set based on if a RTO measurement is
6971                          * needed.
6972                          */
6973                         data_list[i]->do_rtt = 0;
6974                 }
6975                 /* record time */
6976                 data_list[i]->sent_rcv_time = net->last_sent_time;
6977                 data_list[i]->rec.data.cwnd_at_send = net->cwnd;
6978                 data_list[i]->rec.data.fast_retran_tsn = data_list[i]->rec.data.tsn;
6979                 if (data_list[i]->whoTo == NULL) {
6980                         data_list[i]->whoTo = net;
6981                         atomic_add_int(&net->ref_count, 1);
6982                 }
6983                 /* on to the sent queue */
6984                 tp1 = TAILQ_LAST(&asoc->sent_queue, sctpchunk_listhead);
6985                 if ((tp1) && SCTP_TSN_GT(tp1->rec.data.tsn, data_list[i]->rec.data.tsn)) {
6986                         struct sctp_tmit_chunk *tpp;
6987
6988                         /* need to move back */
6989         back_up_more:
6990                         tpp = TAILQ_PREV(tp1, sctpchunk_listhead, sctp_next);
6991                         if (tpp == NULL) {
6992                                 TAILQ_INSERT_BEFORE(tp1, data_list[i], sctp_next);
6993                                 goto all_done;
6994                         }
6995                         tp1 = tpp;
6996                         if (SCTP_TSN_GT(tp1->rec.data.tsn, data_list[i]->rec.data.tsn)) {
6997                                 goto back_up_more;
6998                         }
6999                         TAILQ_INSERT_AFTER(&asoc->sent_queue, tp1, data_list[i], sctp_next);
7000                 } else {
7001                         TAILQ_INSERT_TAIL(&asoc->sent_queue,
7002                             data_list[i],
7003                             sctp_next);
7004                 }
7005 all_done:
7006                 /* This does not lower until the cum-ack passes it */
7007                 asoc->sent_queue_cnt++;
7008                 if ((asoc->peers_rwnd <= 0) &&
7009                     (asoc->total_flight == 0) &&
7010                     (bundle_at == 1)) {
7011                         /* Mark the chunk as being a window probe */
7012                         SCTP_STAT_INCR(sctps_windowprobed);
7013                 }
7014 #ifdef SCTP_AUDITING_ENABLED
7015                 sctp_audit_log(0xC2, 3);
7016 #endif
7017                 data_list[i]->sent = SCTP_DATAGRAM_SENT;
7018                 data_list[i]->snd_count = 1;
7019                 data_list[i]->rec.data.chunk_was_revoked = 0;
7020                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
7021                         sctp_misc_ints(SCTP_FLIGHT_LOG_UP,
7022                             data_list[i]->whoTo->flight_size,
7023                             data_list[i]->book_size,
7024                             (uint32_t)(uintptr_t)data_list[i]->whoTo,
7025                             data_list[i]->rec.data.tsn);
7026                 }
7027                 sctp_flight_size_increase(data_list[i]);
7028                 sctp_total_flight_increase(stcb, data_list[i]);
7029                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_RWND_ENABLE) {
7030                         sctp_log_rwnd(SCTP_DECREASE_PEER_RWND,
7031                             asoc->peers_rwnd, data_list[i]->send_size, SCTP_BASE_SYSCTL(sctp_peer_chunk_oh));
7032                 }
7033                 asoc->peers_rwnd = sctp_sbspace_sub(asoc->peers_rwnd,
7034                     (uint32_t)(data_list[i]->send_size + SCTP_BASE_SYSCTL(sctp_peer_chunk_oh)));
7035                 if (asoc->peers_rwnd < stcb->sctp_ep->sctp_ep.sctp_sws_sender) {
7036                         /* SWS sender side engages */
7037                         asoc->peers_rwnd = 0;
7038                 }
7039         }
7040         if (asoc->cc_functions.sctp_cwnd_update_packet_transmitted) {
7041                 (*asoc->cc_functions.sctp_cwnd_update_packet_transmitted) (stcb, net);
7042         }
7043 }
7044
7045 static void
7046 sctp_clean_up_ctl(struct sctp_tcb *stcb, struct sctp_association *asoc, int so_locked)
7047 {
7048         struct sctp_tmit_chunk *chk, *nchk;
7049
7050         TAILQ_FOREACH_SAFE(chk, &asoc->control_send_queue, sctp_next, nchk) {
7051                 if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
7052                     (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK) ||  /* EY */
7053                     (chk->rec.chunk_id.id == SCTP_HEARTBEAT_REQUEST) ||
7054                     (chk->rec.chunk_id.id == SCTP_HEARTBEAT_ACK) ||
7055                     (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN) ||
7056                     (chk->rec.chunk_id.id == SCTP_SHUTDOWN) ||
7057                     (chk->rec.chunk_id.id == SCTP_SHUTDOWN_ACK) ||
7058                     (chk->rec.chunk_id.id == SCTP_OPERATION_ERROR) ||
7059                     (chk->rec.chunk_id.id == SCTP_PACKET_DROPPED) ||
7060                     (chk->rec.chunk_id.id == SCTP_COOKIE_ACK) ||
7061                     (chk->rec.chunk_id.id == SCTP_ECN_CWR) ||
7062                     (chk->rec.chunk_id.id == SCTP_ASCONF_ACK)) {
7063                         /* Stray chunks must be cleaned up */
7064         clean_up_anyway:
7065                         TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
7066                         asoc->ctrl_queue_cnt--;
7067                         if (chk->data) {
7068                                 sctp_m_freem(chk->data);
7069                                 chk->data = NULL;
7070                         }
7071                         if (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN) {
7072                                 asoc->fwd_tsn_cnt--;
7073                         }
7074                         sctp_free_a_chunk(stcb, chk, so_locked);
7075                 } else if (chk->rec.chunk_id.id == SCTP_STREAM_RESET) {
7076                         /* special handling, we must look into the param */
7077                         if (chk != asoc->str_reset) {
7078                                 goto clean_up_anyway;
7079                         }
7080                 }
7081         }
7082 }
7083
7084 static uint32_t
7085 sctp_can_we_split_this(struct sctp_tcb *stcb, uint32_t length,
7086     uint32_t space_left, uint32_t frag_point, int eeor_on)
7087 {
7088         /*
7089          * Make a decision on if I should split a msg into multiple parts.
7090          * This is only asked of incomplete messages.
7091          */
7092         if (eeor_on) {
7093                 /*
7094                  * If we are doing EEOR we need to always send it if its the
7095                  * entire thing, since it might be all the guy is putting in
7096                  * the hopper.
7097                  */
7098                 if (space_left >= length) {
7099                         /*-
7100                          * If we have data outstanding,
7101                          * we get another chance when the sack
7102                          * arrives to transmit - wait for more data
7103                          */
7104                         if (stcb->asoc.total_flight == 0) {
7105                                 /*
7106                                  * If nothing is in flight, we zero the
7107                                  * packet counter.
7108                                  */
7109                                 return (length);
7110                         }
7111                         return (0);
7112
7113                 } else {
7114                         /* You can fill the rest */
7115                         return (space_left);
7116                 }
7117         }
7118         /*-
7119          * For those strange folk that make the send buffer
7120          * smaller than our fragmentation point, we can't
7121          * get a full msg in so we have to allow splitting.
7122          */
7123         if (SCTP_SB_LIMIT_SND(stcb->sctp_socket) < frag_point) {
7124                 return (length);
7125         }
7126         if ((length <= space_left) ||
7127             ((length - space_left) < SCTP_BASE_SYSCTL(sctp_min_residual))) {
7128                 /* Sub-optimal residual don't split in non-eeor mode. */
7129                 return (0);
7130         }
7131         /*
7132          * If we reach here length is larger than the space_left. Do we wish
7133          * to split it for the sake of packet putting together?
7134          */
7135         if (space_left >= min(SCTP_BASE_SYSCTL(sctp_min_split_point), frag_point)) {
7136                 /* Its ok to split it */
7137                 return (min(space_left, frag_point));
7138         }
7139         /* Nope, can't split */
7140         return (0);
7141 }
7142
7143 static uint32_t
7144 sctp_move_to_outqueue(struct sctp_tcb *stcb,
7145     struct sctp_nets *net,
7146     struct sctp_stream_out *strq,
7147     uint32_t space_left,
7148     uint32_t frag_point,
7149     int *giveup,
7150     int eeor_mode,
7151     int *bail,
7152     int so_locked)
7153 {
7154         /* Move from the stream to the send_queue keeping track of the total */
7155         struct sctp_association *asoc;
7156         struct sctp_stream_queue_pending *sp;
7157         struct sctp_tmit_chunk *chk;
7158         struct sctp_data_chunk *dchkh = NULL;
7159         struct sctp_idata_chunk *ndchkh = NULL;
7160         uint32_t to_move, length;
7161         int leading;
7162         uint8_t rcv_flags = 0;
7163         uint8_t some_taken;
7164
7165         SCTP_TCB_LOCK_ASSERT(stcb);
7166         asoc = &stcb->asoc;
7167 one_more_time:
7168         /* sa_ignore FREED_MEMORY */
7169         sp = TAILQ_FIRST(&strq->outqueue);
7170         if (sp == NULL) {
7171                 sp = TAILQ_FIRST(&strq->outqueue);
7172                 if (sp) {
7173                         goto one_more_time;
7174                 }
7175                 if ((sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_EXPLICIT_EOR) == 0) &&
7176                     (stcb->asoc.idata_supported == 0) &&
7177                     (strq->last_msg_incomplete)) {
7178                         SCTP_PRINTF("Huh? Stream:%d lm_in_c=%d but queue is NULL\n",
7179                             strq->sid,
7180                             strq->last_msg_incomplete);
7181                         strq->last_msg_incomplete = 0;
7182                 }
7183                 to_move = 0;
7184                 goto out_of;
7185         }
7186         if ((sp->msg_is_complete) && (sp->length == 0)) {
7187                 if (sp->sender_all_done) {
7188                         /*
7189                          * We are doing deferred cleanup. Last time through
7190                          * when we took all the data the sender_all_done was
7191                          * not set.
7192                          */
7193                         if ((sp->put_last_out == 0) && (sp->discard_rest == 0)) {
7194                                 SCTP_PRINTF("Gak, put out entire msg with NO end!-1\n");
7195                                 SCTP_PRINTF("sender_done:%d len:%d msg_comp:%d put_last_out:%d\n",
7196                                     sp->sender_all_done,
7197                                     sp->length,
7198                                     sp->msg_is_complete,
7199                                     sp->put_last_out);
7200                         }
7201                         atomic_subtract_int(&asoc->stream_queue_cnt, 1);
7202                         TAILQ_REMOVE(&strq->outqueue, sp, next);
7203                         stcb->asoc.ss_functions.sctp_ss_remove_from_stream(stcb, asoc, strq, sp);
7204                         if ((strq->state == SCTP_STREAM_RESET_PENDING) &&
7205                             (strq->chunks_on_queues == 0) &&
7206                             TAILQ_EMPTY(&strq->outqueue)) {
7207                                 stcb->asoc.trigger_reset = 1;
7208                         }
7209                         if (sp->net) {
7210                                 sctp_free_remote_addr(sp->net);
7211                                 sp->net = NULL;
7212                         }
7213                         if (sp->data) {
7214                                 sctp_m_freem(sp->data);
7215                                 sp->data = NULL;
7216                         }
7217                         sctp_free_a_strmoq(stcb, sp, so_locked);
7218                         /* back to get the next msg */
7219                         goto one_more_time;
7220                 } else {
7221                         /*
7222                          * sender just finished this but still holds a
7223                          * reference
7224                          */
7225                         *giveup = 1;
7226                         to_move = 0;
7227                         goto out_of;
7228                 }
7229         } else {
7230                 /* is there some to get */
7231                 if (sp->length == 0) {
7232                         /* no */
7233                         *giveup = 1;
7234                         to_move = 0;
7235                         goto out_of;
7236                 } else if (sp->discard_rest) {
7237                         /* Whack down the size */
7238                         atomic_subtract_int(&stcb->asoc.total_output_queue_size, sp->length);
7239                         if ((stcb->sctp_socket != NULL) &&
7240                             ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
7241                             (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL))) {
7242                                 atomic_subtract_int(&stcb->sctp_socket->so_snd.sb_cc, sp->length);
7243                         }
7244                         if (sp->data) {
7245                                 sctp_m_freem(sp->data);
7246                                 sp->data = NULL;
7247                                 sp->tail_mbuf = NULL;
7248                         }
7249                         sp->length = 0;
7250                         sp->some_taken = 1;
7251                         *giveup = 1;
7252                         to_move = 0;
7253                         goto out_of;
7254                 }
7255         }
7256         some_taken = sp->some_taken;
7257         length = sp->length;
7258         if (sp->msg_is_complete) {
7259                 /* The message is complete */
7260                 to_move = min(length, frag_point);
7261                 if (to_move == length) {
7262                         /* All of it fits in the MTU */
7263                         if (sp->some_taken) {
7264                                 rcv_flags |= SCTP_DATA_LAST_FRAG;
7265                         } else {
7266                                 rcv_flags |= SCTP_DATA_NOT_FRAG;
7267                         }
7268                         sp->put_last_out = 1;
7269                         if (sp->sinfo_flags & SCTP_SACK_IMMEDIATELY) {
7270                                 rcv_flags |= SCTP_DATA_SACK_IMMEDIATELY;
7271                         }
7272                 } else {
7273                         /* Not all of it fits, we fragment */
7274                         if (sp->some_taken == 0) {
7275                                 rcv_flags |= SCTP_DATA_FIRST_FRAG;
7276                         }
7277                         sp->some_taken = 1;
7278                 }
7279         } else {
7280                 to_move = sctp_can_we_split_this(stcb, length, space_left, frag_point, eeor_mode);
7281                 if (to_move > 0) {
7282                         if (to_move >= length) {
7283                                 to_move = length;
7284                         }
7285                         if (sp->some_taken == 0) {
7286                                 rcv_flags |= SCTP_DATA_FIRST_FRAG;
7287                                 sp->some_taken = 1;
7288                         }
7289                 } else {
7290                         /* Nothing to take. */
7291                         *giveup = 1;
7292                         to_move = 0;
7293                         goto out_of;
7294                 }
7295         }
7296
7297         /* If we reach here, we can copy out a chunk */
7298         sctp_alloc_a_chunk(stcb, chk);
7299         if (chk == NULL) {
7300                 /* No chunk memory */
7301                 *giveup = 1;
7302                 to_move = 0;
7303                 goto out_of;
7304         }
7305         /*
7306          * Setup for unordered if needed by looking at the user sent info
7307          * flags.
7308          */
7309         if (sp->sinfo_flags & SCTP_UNORDERED) {
7310                 rcv_flags |= SCTP_DATA_UNORDERED;
7311         }
7312         if (SCTP_BASE_SYSCTL(sctp_enable_sack_immediately) &&
7313             (sp->sinfo_flags & SCTP_EOF) == SCTP_EOF) {
7314                 rcv_flags |= SCTP_DATA_SACK_IMMEDIATELY;
7315         }
7316         /* clear out the chunk before setting up */
7317         memset(chk, 0, sizeof(*chk));
7318         chk->rec.data.rcv_flags = rcv_flags;
7319
7320         if (to_move >= length) {
7321                 /* we think we can steal the whole thing */
7322                 if (to_move < sp->length) {
7323                         /* bail, it changed */
7324                         goto dont_do_it;
7325                 }
7326                 chk->data = sp->data;
7327                 chk->last_mbuf = sp->tail_mbuf;
7328                 /* register the stealing */
7329                 sp->data = sp->tail_mbuf = NULL;
7330         } else {
7331                 struct mbuf *m;
7332
7333 dont_do_it:
7334                 chk->data = SCTP_M_COPYM(sp->data, 0, to_move, M_NOWAIT);
7335                 chk->last_mbuf = NULL;
7336                 if (chk->data == NULL) {
7337                         sp->some_taken = some_taken;
7338                         sctp_free_a_chunk(stcb, chk, so_locked);
7339                         *bail = 1;
7340                         to_move = 0;
7341                         goto out_of;
7342                 }
7343 #ifdef SCTP_MBUF_LOGGING
7344                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
7345                         sctp_log_mbc(chk->data, SCTP_MBUF_ICOPY);
7346                 }
7347 #endif
7348                 /* Pull off the data */
7349                 m_adj(sp->data, to_move);
7350                 /* Now lets work our way down and compact it */
7351                 m = sp->data;
7352                 while (m && (SCTP_BUF_LEN(m) == 0)) {
7353                         sp->data = SCTP_BUF_NEXT(m);
7354                         SCTP_BUF_NEXT(m) = NULL;
7355                         if (sp->tail_mbuf == m) {
7356                                 /*-
7357                                  * Freeing tail? TSNH since
7358                                  * we supposedly were taking less
7359                                  * than the sp->length.
7360                                  */
7361 #ifdef INVARIANTS
7362                                 panic("Huh, freeing tail? - TSNH");
7363 #else
7364                                 SCTP_PRINTF("Huh, freeing tail? - TSNH\n");
7365                                 sp->tail_mbuf = sp->data = NULL;
7366                                 sp->length = 0;
7367 #endif
7368                         }
7369                         sctp_m_free(m);
7370                         m = sp->data;
7371                 }
7372         }
7373         if (SCTP_BUF_IS_EXTENDED(chk->data)) {
7374                 chk->copy_by_ref = 1;
7375         } else {
7376                 chk->copy_by_ref = 0;
7377         }
7378         /*
7379          * get last_mbuf and counts of mb usage This is ugly but hopefully
7380          * its only one mbuf.
7381          */
7382         if (chk->last_mbuf == NULL) {
7383                 chk->last_mbuf = chk->data;
7384                 while (SCTP_BUF_NEXT(chk->last_mbuf) != NULL) {
7385                         chk->last_mbuf = SCTP_BUF_NEXT(chk->last_mbuf);
7386                 }
7387         }
7388
7389         if (to_move > length) {
7390                 /*- This should not happen either
7391                  * since we always lower to_move to the size
7392                  * of sp->length if its larger.
7393                  */
7394 #ifdef INVARIANTS
7395                 panic("Huh, how can to_move be larger?");
7396 #else
7397                 SCTP_PRINTF("Huh, how can to_move be larger?\n");
7398                 sp->length = 0;
7399 #endif
7400         } else {
7401                 atomic_subtract_int(&sp->length, to_move);
7402         }
7403         leading = SCTP_DATA_CHUNK_OVERHEAD(stcb);
7404         if (M_LEADINGSPACE(chk->data) < leading) {
7405                 /* Not enough room for a chunk header, get some */
7406                 struct mbuf *m;
7407
7408                 m = sctp_get_mbuf_for_msg(1, 0, M_NOWAIT, 1, MT_DATA);
7409                 if (m == NULL) {
7410                         /*
7411                          * we're in trouble here. _PREPEND below will free
7412                          * all the data if there is no leading space, so we
7413                          * must put the data back and restore.
7414                          */
7415                         if (sp->data == NULL) {
7416                                 /* unsteal the data */
7417                                 sp->data = chk->data;
7418                                 sp->tail_mbuf = chk->last_mbuf;
7419                         } else {
7420                                 struct mbuf *m_tmp;
7421
7422                                 /* reassemble the data */
7423                                 m_tmp = sp->data;
7424                                 sp->data = chk->data;
7425                                 SCTP_BUF_NEXT(chk->last_mbuf) = m_tmp;
7426                         }
7427                         sp->some_taken = some_taken;
7428                         atomic_add_int(&sp->length, to_move);
7429                         chk->data = NULL;
7430                         *bail = 1;
7431                         sctp_free_a_chunk(stcb, chk, so_locked);
7432                         to_move = 0;
7433                         goto out_of;
7434                 } else {
7435                         SCTP_BUF_LEN(m) = 0;
7436                         SCTP_BUF_NEXT(m) = chk->data;
7437                         chk->data = m;
7438                         M_ALIGN(chk->data, 4);
7439                 }
7440         }
7441         SCTP_BUF_PREPEND(chk->data, SCTP_DATA_CHUNK_OVERHEAD(stcb), M_NOWAIT);
7442         if (chk->data == NULL) {
7443                 /* HELP, TSNH since we assured it would not above? */
7444 #ifdef INVARIANTS
7445                 panic("prepend fails HELP?");
7446 #else
7447                 SCTP_PRINTF("prepend fails HELP?\n");
7448                 sctp_free_a_chunk(stcb, chk, so_locked);
7449 #endif
7450                 *bail = 1;
7451                 to_move = 0;
7452                 goto out_of;
7453         }
7454         sctp_snd_sb_alloc(stcb, SCTP_DATA_CHUNK_OVERHEAD(stcb));
7455         chk->book_size = chk->send_size = (uint16_t)(to_move + SCTP_DATA_CHUNK_OVERHEAD(stcb));
7456         chk->book_size_scale = 0;
7457         chk->sent = SCTP_DATAGRAM_UNSENT;
7458
7459         chk->flags = 0;
7460         chk->asoc = &stcb->asoc;
7461         chk->pad_inplace = 0;
7462         chk->no_fr_allowed = 0;
7463         if (stcb->asoc.idata_supported == 0) {
7464                 if (rcv_flags & SCTP_DATA_UNORDERED) {
7465                         /* Just use 0. The receiver ignores the values. */
7466                         chk->rec.data.mid = 0;
7467                 } else {
7468                         chk->rec.data.mid = strq->next_mid_ordered;
7469                         if (rcv_flags & SCTP_DATA_LAST_FRAG) {
7470                                 strq->next_mid_ordered++;
7471                         }
7472                 }
7473         } else {
7474                 if (rcv_flags & SCTP_DATA_UNORDERED) {
7475                         chk->rec.data.mid = strq->next_mid_unordered;
7476                         if (rcv_flags & SCTP_DATA_LAST_FRAG) {
7477                                 strq->next_mid_unordered++;
7478                         }
7479                 } else {
7480                         chk->rec.data.mid = strq->next_mid_ordered;
7481                         if (rcv_flags & SCTP_DATA_LAST_FRAG) {
7482                                 strq->next_mid_ordered++;
7483                         }
7484                 }
7485         }
7486         chk->rec.data.sid = sp->sid;
7487         chk->rec.data.ppid = sp->ppid;
7488         chk->rec.data.context = sp->context;
7489         chk->rec.data.doing_fast_retransmit = 0;
7490
7491         chk->rec.data.timetodrop = sp->ts;
7492         chk->flags = sp->act_flags;
7493
7494         if (sp->net) {
7495                 chk->whoTo = sp->net;
7496                 atomic_add_int(&chk->whoTo->ref_count, 1);
7497         } else
7498                 chk->whoTo = NULL;
7499
7500         if (sp->holds_key_ref) {
7501                 chk->auth_keyid = sp->auth_keyid;
7502                 sctp_auth_key_acquire(stcb, chk->auth_keyid);
7503                 chk->holds_key_ref = 1;
7504         }
7505         stcb->asoc.ss_functions.sctp_ss_scheduled(stcb, net, asoc, strq, to_move);
7506         chk->rec.data.tsn = atomic_fetchadd_int(&asoc->sending_seq, 1);
7507         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_AT_SEND_2_OUTQ) {
7508                 sctp_misc_ints(SCTP_STRMOUT_LOG_SEND,
7509                     (uint32_t)(uintptr_t)stcb, sp->length,
7510                     (uint32_t)((chk->rec.data.sid << 16) | (0x0000ffff & chk->rec.data.mid)),
7511                     chk->rec.data.tsn);
7512         }
7513         if (stcb->asoc.idata_supported == 0) {
7514                 dchkh = mtod(chk->data, struct sctp_data_chunk *);
7515         } else {
7516                 ndchkh = mtod(chk->data, struct sctp_idata_chunk *);
7517         }
7518         /*
7519          * Put the rest of the things in place now. Size was done earlier in
7520          * previous loop prior to padding.
7521          */
7522
7523         SCTP_TCB_LOCK_ASSERT(stcb);
7524 #ifdef SCTP_ASOCLOG_OF_TSNS
7525         if (asoc->tsn_out_at >= SCTP_TSN_LOG_SIZE) {
7526                 asoc->tsn_out_at = 0;
7527                 asoc->tsn_out_wrapped = 1;
7528         }
7529         asoc->out_tsnlog[asoc->tsn_out_at].tsn = chk->rec.data.tsn;
7530         asoc->out_tsnlog[asoc->tsn_out_at].strm = chk->rec.data.sid;
7531         asoc->out_tsnlog[asoc->tsn_out_at].seq = chk->rec.data.mid;
7532         asoc->out_tsnlog[asoc->tsn_out_at].sz = chk->send_size;
7533         asoc->out_tsnlog[asoc->tsn_out_at].flgs = chk->rec.data.rcv_flags;
7534         asoc->out_tsnlog[asoc->tsn_out_at].stcb = (void *)stcb;
7535         asoc->out_tsnlog[asoc->tsn_out_at].in_pos = asoc->tsn_out_at;
7536         asoc->out_tsnlog[asoc->tsn_out_at].in_out = 2;
7537         asoc->tsn_out_at++;
7538 #endif
7539         if (stcb->asoc.idata_supported == 0) {
7540                 dchkh->ch.chunk_type = SCTP_DATA;
7541                 dchkh->ch.chunk_flags = chk->rec.data.rcv_flags;
7542                 dchkh->dp.tsn = htonl(chk->rec.data.tsn);
7543                 dchkh->dp.sid = htons(strq->sid);
7544                 dchkh->dp.ssn = htons((uint16_t)chk->rec.data.mid);
7545                 dchkh->dp.ppid = chk->rec.data.ppid;
7546                 dchkh->ch.chunk_length = htons(chk->send_size);
7547         } else {
7548                 ndchkh->ch.chunk_type = SCTP_IDATA;
7549                 ndchkh->ch.chunk_flags = chk->rec.data.rcv_flags;
7550                 ndchkh->dp.tsn = htonl(chk->rec.data.tsn);
7551                 ndchkh->dp.sid = htons(strq->sid);
7552                 ndchkh->dp.reserved = htons(0);
7553                 ndchkh->dp.mid = htonl(chk->rec.data.mid);
7554                 if (sp->fsn == 0)
7555                         ndchkh->dp.ppid_fsn.ppid = chk->rec.data.ppid;
7556                 else
7557                         ndchkh->dp.ppid_fsn.fsn = htonl(sp->fsn);
7558                 sp->fsn++;
7559                 ndchkh->ch.chunk_length = htons(chk->send_size);
7560         }
7561         /* Now advance the chk->send_size by the actual pad needed. */
7562         if (chk->send_size < SCTP_SIZE32(chk->book_size)) {
7563                 /* need a pad */
7564                 struct mbuf *lm;
7565                 int pads;
7566
7567                 pads = SCTP_SIZE32(chk->book_size) - chk->send_size;
7568                 lm = sctp_pad_lastmbuf(chk->data, pads, chk->last_mbuf);
7569                 if (lm != NULL) {
7570                         chk->last_mbuf = lm;
7571                         chk->pad_inplace = 1;
7572                 }
7573                 chk->send_size += pads;
7574         }
7575         if (PR_SCTP_ENABLED(chk->flags)) {
7576                 asoc->pr_sctp_cnt++;
7577         }
7578         if (sp->msg_is_complete && (sp->length == 0) && (sp->sender_all_done)) {
7579                 /* All done pull and kill the message */
7580                 if (sp->put_last_out == 0) {
7581                         SCTP_PRINTF("Gak, put out entire msg with NO end!-2\n");
7582                         SCTP_PRINTF("sender_done:%d len:%d msg_comp:%d put_last_out:%d\n",
7583                             sp->sender_all_done,
7584                             sp->length,
7585                             sp->msg_is_complete,
7586                             sp->put_last_out);
7587                 }
7588                 atomic_subtract_int(&asoc->stream_queue_cnt, 1);
7589                 TAILQ_REMOVE(&strq->outqueue, sp, next);
7590                 stcb->asoc.ss_functions.sctp_ss_remove_from_stream(stcb, asoc, strq, sp);
7591                 if ((strq->state == SCTP_STREAM_RESET_PENDING) &&
7592                     (strq->chunks_on_queues == 0) &&
7593                     TAILQ_EMPTY(&strq->outqueue)) {
7594                         stcb->asoc.trigger_reset = 1;
7595                 }
7596                 if (sp->net) {
7597                         sctp_free_remote_addr(sp->net);
7598                         sp->net = NULL;
7599                 }
7600                 if (sp->data) {
7601                         sctp_m_freem(sp->data);
7602                         sp->data = NULL;
7603                 }
7604                 sctp_free_a_strmoq(stcb, sp, so_locked);
7605         }
7606         asoc->chunks_on_out_queue++;
7607         strq->chunks_on_queues++;
7608         TAILQ_INSERT_TAIL(&asoc->send_queue, chk, sctp_next);
7609         asoc->send_queue_cnt++;
7610 out_of:
7611         return (to_move);
7612 }
7613
7614 static void
7615 sctp_fill_outqueue(struct sctp_tcb *stcb, struct sctp_nets *net,
7616     uint32_t frag_point, int eeor_mode, int *quit_now,
7617     int so_locked)
7618 {
7619         struct sctp_association *asoc;
7620         struct sctp_stream_out *strq;
7621         uint32_t space_left, moved, total_moved;
7622         int bail, giveup;
7623
7624         SCTP_TCB_LOCK_ASSERT(stcb);
7625         asoc = &stcb->asoc;
7626         total_moved = 0;
7627         switch (net->ro._l_addr.sa.sa_family) {
7628 #ifdef INET
7629         case AF_INET:
7630                 space_left = net->mtu - SCTP_MIN_V4_OVERHEAD;
7631                 break;
7632 #endif
7633 #ifdef INET6
7634         case AF_INET6:
7635                 space_left = net->mtu - SCTP_MIN_OVERHEAD;
7636                 break;
7637 #endif
7638         default:
7639                 /* TSNH */
7640                 space_left = net->mtu;
7641                 break;
7642         }
7643         /* Need an allowance for the data chunk header too */
7644         space_left -= SCTP_DATA_CHUNK_OVERHEAD(stcb);
7645
7646         /* must make even word boundary */
7647         space_left &= 0xfffffffc;
7648         strq = stcb->asoc.ss_functions.sctp_ss_select_stream(stcb, net, asoc);
7649         giveup = 0;
7650         bail = 0;
7651         while ((space_left > 0) && (strq != NULL)) {
7652                 moved = sctp_move_to_outqueue(stcb, net, strq, space_left,
7653                     frag_point, &giveup, eeor_mode,
7654                     &bail, so_locked);
7655                 if ((giveup != 0) || (bail != 0)) {
7656                         break;
7657                 }
7658                 strq = stcb->asoc.ss_functions.sctp_ss_select_stream(stcb, net, asoc);
7659                 total_moved += moved;
7660                 if (space_left >= moved) {
7661                         space_left -= moved;
7662                 } else {
7663                         space_left = 0;
7664                 }
7665                 if (space_left >= SCTP_DATA_CHUNK_OVERHEAD(stcb)) {
7666                         space_left -= SCTP_DATA_CHUNK_OVERHEAD(stcb);
7667                 } else {
7668                         space_left = 0;
7669                 }
7670                 space_left &= 0xfffffffc;
7671         }
7672         if (bail != 0)
7673                 *quit_now = 1;
7674
7675         stcb->asoc.ss_functions.sctp_ss_packet_done(stcb, net, asoc);
7676
7677         if (total_moved == 0) {
7678                 if ((stcb->asoc.sctp_cmt_on_off == 0) &&
7679                     (net == stcb->asoc.primary_destination)) {
7680                         /* ran dry for primary network net */
7681                         SCTP_STAT_INCR(sctps_primary_randry);
7682                 } else if (stcb->asoc.sctp_cmt_on_off > 0) {
7683                         /* ran dry with CMT on */
7684                         SCTP_STAT_INCR(sctps_cmt_randry);
7685                 }
7686         }
7687 }
7688
7689 void
7690 sctp_fix_ecn_echo(struct sctp_association *asoc)
7691 {
7692         struct sctp_tmit_chunk *chk;
7693
7694         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
7695                 if (chk->rec.chunk_id.id == SCTP_ECN_ECHO) {
7696                         chk->sent = SCTP_DATAGRAM_UNSENT;
7697                 }
7698         }
7699 }
7700
7701 void
7702 sctp_move_chunks_from_net(struct sctp_tcb *stcb, struct sctp_nets *net)
7703 {
7704         struct sctp_association *asoc;
7705         struct sctp_tmit_chunk *chk;
7706         struct sctp_stream_queue_pending *sp;
7707         unsigned int i;
7708
7709         if (net == NULL) {
7710                 return;
7711         }
7712         asoc = &stcb->asoc;
7713         for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
7714                 TAILQ_FOREACH(sp, &stcb->asoc.strmout[i].outqueue, next) {
7715                         if (sp->net == net) {
7716                                 sctp_free_remote_addr(sp->net);
7717                                 sp->net = NULL;
7718                         }
7719                 }
7720         }
7721         TAILQ_FOREACH(chk, &asoc->send_queue, sctp_next) {
7722                 if (chk->whoTo == net) {
7723                         sctp_free_remote_addr(chk->whoTo);
7724                         chk->whoTo = NULL;
7725                 }
7726         }
7727 }
7728
7729 int
7730 sctp_med_chunk_output(struct sctp_inpcb *inp,
7731     struct sctp_tcb *stcb,
7732     struct sctp_association *asoc,
7733     int *num_out,
7734     int *reason_code,
7735     int control_only, int from_where,
7736     struct timeval *now, int *now_filled,
7737     uint32_t frag_point, int so_locked)
7738 {
7739         /**
7740          * Ok this is the generic chunk service queue. we must do the
7741          * following:
7742          * - Service the stream queue that is next, moving any
7743          *   message (note I must get a complete message i.e. FIRST/MIDDLE and
7744          *   LAST to the out queue in one pass) and assigning TSN's. This
7745          *   only applies though if the peer does not support NDATA. For NDATA
7746          *   chunks its ok to not send the entire message ;-)
7747          * - Check to see if the cwnd/rwnd allows any output, if so we go ahead and
7748          *   formulate and send the low level chunks. Making sure to combine
7749          *   any control in the control chunk queue also.
7750          */
7751         struct sctp_nets *net, *start_at, *sack_goes_to = NULL, *old_start_at = NULL;
7752         struct mbuf *outchain, *endoutchain;
7753         struct sctp_tmit_chunk *chk, *nchk;
7754
7755         /* temp arrays for unlinking */
7756         struct sctp_tmit_chunk *data_list[SCTP_MAX_DATA_BUNDLING];
7757         int no_fragmentflg, error;
7758         unsigned int max_rwnd_per_dest, max_send_per_dest;
7759         int one_chunk, hbflag, skip_data_for_this_net;
7760         int asconf, cookie, no_out_cnt;
7761         int bundle_at, ctl_cnt, no_data_chunks, eeor_mode;
7762         unsigned int mtu, r_mtu, omtu, mx_mtu, to_out;
7763         int tsns_sent = 0;
7764         uint32_t auth_offset;
7765         struct sctp_auth_chunk *auth;
7766         uint16_t auth_keyid;
7767         int override_ok = 1;
7768         int skip_fill_up = 0;
7769         int data_auth_reqd = 0;
7770
7771         /*
7772          * JRS 5/14/07 - Add flag for whether a heartbeat is sent to the
7773          * destination.
7774          */
7775         int quit_now = 0;
7776
7777         *num_out = 0;
7778         *reason_code = 0;
7779         auth_keyid = stcb->asoc.authinfo.active_keyid;
7780         if ((asoc->state & SCTP_STATE_SHUTDOWN_PENDING) ||
7781             (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_RECEIVED) ||
7782             (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_EXPLICIT_EOR))) {
7783                 eeor_mode = 1;
7784         } else {
7785                 eeor_mode = 0;
7786         }
7787         ctl_cnt = no_out_cnt = asconf = cookie = 0;
7788         /*
7789          * First lets prime the pump. For each destination, if there is room
7790          * in the flight size, attempt to pull an MTU's worth out of the
7791          * stream queues into the general send_queue
7792          */
7793 #ifdef SCTP_AUDITING_ENABLED
7794         sctp_audit_log(0xC2, 2);
7795 #endif
7796         SCTP_TCB_LOCK_ASSERT(stcb);
7797         hbflag = 0;
7798         if (control_only)
7799                 no_data_chunks = 1;
7800         else
7801                 no_data_chunks = 0;
7802
7803         /* Nothing to possible to send? */
7804         if ((TAILQ_EMPTY(&asoc->control_send_queue) ||
7805             (asoc->ctrl_queue_cnt == stcb->asoc.ecn_echo_cnt_onq)) &&
7806             TAILQ_EMPTY(&asoc->asconf_send_queue) &&
7807             TAILQ_EMPTY(&asoc->send_queue) &&
7808             sctp_is_there_unsent_data(stcb, so_locked) == 0) {
7809 nothing_to_send:
7810                 *reason_code = 9;
7811                 return (0);
7812         }
7813         if (asoc->peers_rwnd == 0) {
7814                 /* No room in peers rwnd */
7815                 *reason_code = 1;
7816                 if (asoc->total_flight > 0) {
7817                         /* we are allowed one chunk in flight */
7818                         no_data_chunks = 1;
7819                 }
7820         }
7821         if (stcb->asoc.ecn_echo_cnt_onq) {
7822                 /* Record where a sack goes, if any */
7823                 if (no_data_chunks &&
7824                     (asoc->ctrl_queue_cnt == stcb->asoc.ecn_echo_cnt_onq)) {
7825                         /* Nothing but ECNe to send - we don't do that */
7826                         goto nothing_to_send;
7827                 }
7828                 TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
7829                         if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
7830                             (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK)) {
7831                                 sack_goes_to = chk->whoTo;
7832                                 break;
7833                         }
7834                 }
7835         }
7836         max_rwnd_per_dest = ((asoc->peers_rwnd + asoc->total_flight) / asoc->numnets);
7837         if (stcb->sctp_socket)
7838                 max_send_per_dest = SCTP_SB_LIMIT_SND(stcb->sctp_socket) / asoc->numnets;
7839         else
7840                 max_send_per_dest = 0;
7841         if (no_data_chunks == 0) {
7842                 /* How many non-directed chunks are there? */
7843                 TAILQ_FOREACH(chk, &asoc->send_queue, sctp_next) {
7844                         if (chk->whoTo == NULL) {
7845                                 /*
7846                                  * We already have non-directed chunks on
7847                                  * the queue, no need to do a fill-up.
7848                                  */
7849                                 skip_fill_up = 1;
7850                                 break;
7851                         }
7852                 }
7853         }
7854         if ((no_data_chunks == 0) &&
7855             (skip_fill_up == 0) &&
7856             (!stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc))) {
7857                 TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
7858                         /*
7859                          * This for loop we are in takes in each net, if
7860                          * its's got space in cwnd and has data sent to it
7861                          * (when CMT is off) then it calls
7862                          * sctp_fill_outqueue for the net. This gets data on
7863                          * the send queue for that network.
7864                          *
7865                          * In sctp_fill_outqueue TSN's are assigned and data
7866                          * is copied out of the stream buffers. Note mostly
7867                          * copy by reference (we hope).
7868                          */
7869                         net->window_probe = 0;
7870                         if ((net != stcb->asoc.alternate) &&
7871                             ((net->dest_state & SCTP_ADDR_PF) ||
7872                             (!(net->dest_state & SCTP_ADDR_REACHABLE)) ||
7873                             (net->dest_state & SCTP_ADDR_UNCONFIRMED))) {
7874                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
7875                                         sctp_log_cwnd(stcb, net, 1,
7876                                             SCTP_CWND_LOG_FILL_OUTQ_CALLED);
7877                                 }
7878                                 continue;
7879                         }
7880                         if ((stcb->asoc.cc_functions.sctp_cwnd_new_transmission_begins) &&
7881                             (net->flight_size == 0)) {
7882                                 (*stcb->asoc.cc_functions.sctp_cwnd_new_transmission_begins) (stcb, net);
7883                         }
7884                         if (net->flight_size >= net->cwnd) {
7885                                 /* skip this network, no room - can't fill */
7886                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
7887                                         sctp_log_cwnd(stcb, net, 3,
7888                                             SCTP_CWND_LOG_FILL_OUTQ_CALLED);
7889                                 }
7890                                 continue;
7891                         }
7892                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
7893                                 sctp_log_cwnd(stcb, net, 4, SCTP_CWND_LOG_FILL_OUTQ_CALLED);
7894                         }
7895                         sctp_fill_outqueue(stcb, net, frag_point, eeor_mode, &quit_now, so_locked);
7896                         if (quit_now) {
7897                                 /* memory alloc failure */
7898                                 no_data_chunks = 1;
7899                                 break;
7900                         }
7901                 }
7902         }
7903         /* now service each destination and send out what we can for it */
7904         /* Nothing to send? */
7905         if (TAILQ_EMPTY(&asoc->control_send_queue) &&
7906             TAILQ_EMPTY(&asoc->asconf_send_queue) &&
7907             TAILQ_EMPTY(&asoc->send_queue)) {
7908                 *reason_code = 8;
7909                 return (0);
7910         }
7911
7912         if (asoc->sctp_cmt_on_off > 0) {
7913                 /* get the last start point */
7914                 start_at = asoc->last_net_cmt_send_started;
7915                 if (start_at == NULL) {
7916                         /* null so to beginning */
7917                         start_at = TAILQ_FIRST(&asoc->nets);
7918                 } else {
7919                         start_at = TAILQ_NEXT(asoc->last_net_cmt_send_started, sctp_next);
7920                         if (start_at == NULL) {
7921                                 start_at = TAILQ_FIRST(&asoc->nets);
7922                         }
7923                 }
7924                 asoc->last_net_cmt_send_started = start_at;
7925         } else {
7926                 start_at = TAILQ_FIRST(&asoc->nets);
7927         }
7928         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
7929                 if (chk->whoTo == NULL) {
7930                         if (asoc->alternate) {
7931                                 chk->whoTo = asoc->alternate;
7932                         } else {
7933                                 chk->whoTo = asoc->primary_destination;
7934                         }
7935                         atomic_add_int(&chk->whoTo->ref_count, 1);
7936                 }
7937         }
7938         old_start_at = NULL;
7939 again_one_more_time:
7940         for (net = start_at; net != NULL; net = TAILQ_NEXT(net, sctp_next)) {
7941                 /* how much can we send? */
7942                 /* SCTPDBG("Examine for sending net:%x\n", (uint32_t)net); */
7943                 if (old_start_at && (old_start_at == net)) {
7944                         /* through list completely. */
7945                         break;
7946                 }
7947                 tsns_sent = 0xa;
7948                 if (TAILQ_EMPTY(&asoc->control_send_queue) &&
7949                     TAILQ_EMPTY(&asoc->asconf_send_queue) &&
7950                     (net->flight_size >= net->cwnd)) {
7951                         /*
7952                          * Nothing on control or asconf and flight is full,
7953                          * we can skip even in the CMT case.
7954                          */
7955                         continue;
7956                 }
7957                 bundle_at = 0;
7958                 endoutchain = outchain = NULL;
7959                 auth = NULL;
7960                 auth_offset = 0;
7961                 no_fragmentflg = 1;
7962                 one_chunk = 0;
7963                 if (net->dest_state & SCTP_ADDR_UNCONFIRMED) {
7964                         skip_data_for_this_net = 1;
7965                 } else {
7966                         skip_data_for_this_net = 0;
7967                 }
7968                 switch (((struct sockaddr *)&net->ro._l_addr)->sa_family) {
7969 #ifdef INET
7970                 case AF_INET:
7971                         mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
7972                         break;
7973 #endif
7974 #ifdef INET6
7975                 case AF_INET6:
7976                         mtu = net->mtu - SCTP_MIN_OVERHEAD;
7977                         break;
7978 #endif
7979                 default:
7980                         /* TSNH */
7981                         mtu = net->mtu;
7982                         break;
7983                 }
7984                 mx_mtu = mtu;
7985                 to_out = 0;
7986                 if (mtu > asoc->peers_rwnd) {
7987                         if (asoc->total_flight > 0) {
7988                                 /* We have a packet in flight somewhere */
7989                                 r_mtu = asoc->peers_rwnd;
7990                         } else {
7991                                 /* We are always allowed to send one MTU out */
7992                                 one_chunk = 1;
7993                                 r_mtu = mtu;
7994                         }
7995                 } else {
7996                         r_mtu = mtu;
7997                 }
7998                 error = 0;
7999                 /************************/
8000                 /* ASCONF transmission */
8001                 /************************/
8002                 /* Now first lets go through the asconf queue */
8003                 TAILQ_FOREACH_SAFE(chk, &asoc->asconf_send_queue, sctp_next, nchk) {
8004                         if (chk->rec.chunk_id.id != SCTP_ASCONF) {
8005                                 continue;
8006                         }
8007                         if (chk->whoTo == NULL) {
8008                                 if (asoc->alternate == NULL) {
8009                                         if (asoc->primary_destination != net) {
8010                                                 break;
8011                                         }
8012                                 } else {
8013                                         if (asoc->alternate != net) {
8014                                                 break;
8015                                         }
8016                                 }
8017                         } else {
8018                                 if (chk->whoTo != net) {
8019                                         break;
8020                                 }
8021                         }
8022                         if (chk->data == NULL) {
8023                                 break;
8024                         }
8025                         if (chk->sent != SCTP_DATAGRAM_UNSENT &&
8026                             chk->sent != SCTP_DATAGRAM_RESEND) {
8027                                 break;
8028                         }
8029                         /*
8030                          * if no AUTH is yet included and this chunk
8031                          * requires it, make sure to account for it.  We
8032                          * don't apply the size until the AUTH chunk is
8033                          * actually added below in case there is no room for
8034                          * this chunk. NOTE: we overload the use of "omtu"
8035                          * here
8036                          */
8037                         if ((auth == NULL) &&
8038                             sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
8039                             stcb->asoc.peer_auth_chunks)) {
8040                                 omtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
8041                         } else
8042                                 omtu = 0;
8043                         /* Here we do NOT factor the r_mtu */
8044                         if ((chk->send_size < (int)(mtu - omtu)) ||
8045                             (chk->flags & CHUNK_FLAGS_FRAGMENT_OK)) {
8046                                 /*
8047                                  * We probably should glom the mbuf chain
8048                                  * from the chk->data for control but the
8049                                  * problem is it becomes yet one more level
8050                                  * of tracking to do if for some reason
8051                                  * output fails. Then I have got to
8052                                  * reconstruct the merged control chain.. el
8053                                  * yucko.. for now we take the easy way and
8054                                  * do the copy
8055                                  */
8056                                 /*
8057                                  * Add an AUTH chunk, if chunk requires it
8058                                  * save the offset into the chain for AUTH
8059                                  */
8060                                 if ((auth == NULL) &&
8061                                     (sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
8062                                     stcb->asoc.peer_auth_chunks))) {
8063                                         outchain = sctp_add_auth_chunk(outchain,
8064                                             &endoutchain,
8065                                             &auth,
8066                                             &auth_offset,
8067                                             stcb,
8068                                             chk->rec.chunk_id.id);
8069                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8070                                 }
8071                                 outchain = sctp_copy_mbufchain(chk->data, outchain, &endoutchain,
8072                                     (int)chk->rec.chunk_id.can_take_data,
8073                                     chk->send_size, chk->copy_by_ref);
8074                                 if (outchain == NULL) {
8075                                         *reason_code = 8;
8076                                         SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
8077                                         return (ENOMEM);
8078                                 }
8079                                 SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8080                                 /* update our MTU size */
8081                                 if (mtu > (chk->send_size + omtu))
8082                                         mtu -= (chk->send_size + omtu);
8083                                 else
8084                                         mtu = 0;
8085                                 to_out += (chk->send_size + omtu);
8086                                 /* Do clear IP_DF ? */
8087                                 if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
8088                                         no_fragmentflg = 0;
8089                                 }
8090                                 if (chk->rec.chunk_id.can_take_data)
8091                                         chk->data = NULL;
8092                                 /*
8093                                  * set hb flag since we can use these for
8094                                  * RTO
8095                                  */
8096                                 hbflag = 1;
8097                                 asconf = 1;
8098                                 /*
8099                                  * should sysctl this: don't bundle data
8100                                  * with ASCONF since it requires AUTH
8101                                  */
8102                                 no_data_chunks = 1;
8103                                 chk->sent = SCTP_DATAGRAM_SENT;
8104                                 if (chk->whoTo == NULL) {
8105                                         chk->whoTo = net;
8106                                         atomic_add_int(&net->ref_count, 1);
8107                                 }
8108                                 chk->snd_count++;
8109                                 if (mtu == 0) {
8110                                         /*
8111                                          * Ok we are out of room but we can
8112                                          * output without effecting the
8113                                          * flight size since this little guy
8114                                          * is a control only packet.
8115                                          */
8116                                         sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp, stcb, net);
8117                                         /*
8118                                          * do NOT clear the asconf flag as
8119                                          * it is used to do appropriate
8120                                          * source address selection.
8121                                          */
8122                                         if (*now_filled == 0) {
8123                                                 (void)SCTP_GETTIME_TIMEVAL(now);
8124                                                 *now_filled = 1;
8125                                         }
8126                                         net->last_sent_time = *now;
8127                                         hbflag = 0;
8128                                         if ((error = sctp_lowlevel_chunk_output(inp, stcb, net,
8129                                             (struct sockaddr *)&net->ro._l_addr,
8130                                             outchain, auth_offset, auth,
8131                                             stcb->asoc.authinfo.active_keyid,
8132                                             no_fragmentflg, 0, asconf,
8133                                             inp->sctp_lport, stcb->rport,
8134                                             htonl(stcb->asoc.peer_vtag),
8135                                             net->port, NULL,
8136                                             0, 0,
8137                                             so_locked))) {
8138                                                 /*
8139                                                  * error, we could not
8140                                                  * output
8141                                                  */
8142                                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
8143                                                 if (from_where == 0) {
8144                                                         SCTP_STAT_INCR(sctps_lowlevelerrusr);
8145                                                 }
8146                                                 if (error == ENOBUFS) {
8147                                                         asoc->ifp_had_enobuf = 1;
8148                                                         SCTP_STAT_INCR(sctps_lowlevelerr);
8149                                                 }
8150                                                 /* error, could not output */
8151                                                 if (error == EHOSTUNREACH) {
8152                                                         /*
8153                                                          * Destination went
8154                                                          * unreachable
8155                                                          * during this send
8156                                                          */
8157                                                         sctp_move_chunks_from_net(stcb, net);
8158                                                 }
8159                                                 *reason_code = 7;
8160                                                 break;
8161                                         } else {
8162                                                 asoc->ifp_had_enobuf = 0;
8163                                         }
8164                                         /*
8165                                          * increase the number we sent, if a
8166                                          * cookie is sent we don't tell them
8167                                          * any was sent out.
8168                                          */
8169                                         outchain = endoutchain = NULL;
8170                                         auth = NULL;
8171                                         auth_offset = 0;
8172                                         if (!no_out_cnt)
8173                                                 *num_out += ctl_cnt;
8174                                         /* recalc a clean slate and setup */
8175                                         switch (net->ro._l_addr.sa.sa_family) {
8176 #ifdef INET
8177                                         case AF_INET:
8178                                                 mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
8179                                                 break;
8180 #endif
8181 #ifdef INET6
8182                                         case AF_INET6:
8183                                                 mtu = net->mtu - SCTP_MIN_OVERHEAD;
8184                                                 break;
8185 #endif
8186                                         default:
8187                                                 /* TSNH */
8188                                                 mtu = net->mtu;
8189                                                 break;
8190                                         }
8191                                         to_out = 0;
8192                                         no_fragmentflg = 1;
8193                                 }
8194                         }
8195                 }
8196                 if (error != 0) {
8197                         /* try next net */
8198                         continue;
8199                 }
8200                 /************************/
8201                 /* Control transmission */
8202                 /************************/
8203                 /* Now first lets go through the control queue */
8204                 TAILQ_FOREACH_SAFE(chk, &asoc->control_send_queue, sctp_next, nchk) {
8205                         if ((sack_goes_to) &&
8206                             (chk->rec.chunk_id.id == SCTP_ECN_ECHO) &&
8207                             (chk->whoTo != sack_goes_to)) {
8208                                 /*
8209                                  * if we have a sack in queue, and we are
8210                                  * looking at an ecn echo that is NOT queued
8211                                  * to where the sack is going..
8212                                  */
8213                                 if (chk->whoTo == net) {
8214                                         /*
8215                                          * Don't transmit it to where its
8216                                          * going (current net)
8217                                          */
8218                                         continue;
8219                                 } else if (sack_goes_to == net) {
8220                                         /*
8221                                          * But do transmit it to this
8222                                          * address
8223                                          */
8224                                         goto skip_net_check;
8225                                 }
8226                         }
8227                         if (chk->whoTo == NULL) {
8228                                 if (asoc->alternate == NULL) {
8229                                         if (asoc->primary_destination != net) {
8230                                                 continue;
8231                                         }
8232                                 } else {
8233                                         if (asoc->alternate != net) {
8234                                                 continue;
8235                                         }
8236                                 }
8237                         } else {
8238                                 if (chk->whoTo != net) {
8239                                         continue;
8240                                 }
8241                         }
8242         skip_net_check:
8243                         if (chk->data == NULL) {
8244                                 continue;
8245                         }
8246                         if (chk->sent != SCTP_DATAGRAM_UNSENT) {
8247                                 /*
8248                                  * It must be unsent. Cookies and ASCONF's
8249                                  * hang around but there timers will force
8250                                  * when marked for resend.
8251                                  */
8252                                 continue;
8253                         }
8254                         /*
8255                          * if no AUTH is yet included and this chunk
8256                          * requires it, make sure to account for it.  We
8257                          * don't apply the size until the AUTH chunk is
8258                          * actually added below in case there is no room for
8259                          * this chunk. NOTE: we overload the use of "omtu"
8260                          * here
8261                          */
8262                         if ((auth == NULL) &&
8263                             sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
8264                             stcb->asoc.peer_auth_chunks)) {
8265                                 omtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
8266                         } else
8267                                 omtu = 0;
8268                         /* Here we do NOT factor the r_mtu */
8269                         if ((chk->send_size <= (int)(mtu - omtu)) ||
8270                             (chk->flags & CHUNK_FLAGS_FRAGMENT_OK)) {
8271                                 /*
8272                                  * We probably should glom the mbuf chain
8273                                  * from the chk->data for control but the
8274                                  * problem is it becomes yet one more level
8275                                  * of tracking to do if for some reason
8276                                  * output fails. Then I have got to
8277                                  * reconstruct the merged control chain.. el
8278                                  * yucko.. for now we take the easy way and
8279                                  * do the copy
8280                                  */
8281                                 /*
8282                                  * Add an AUTH chunk, if chunk requires it
8283                                  * save the offset into the chain for AUTH
8284                                  */
8285                                 if ((auth == NULL) &&
8286                                     (sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
8287                                     stcb->asoc.peer_auth_chunks))) {
8288                                         outchain = sctp_add_auth_chunk(outchain,
8289                                             &endoutchain,
8290                                             &auth,
8291                                             &auth_offset,
8292                                             stcb,
8293                                             chk->rec.chunk_id.id);
8294                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8295                                 }
8296                                 outchain = sctp_copy_mbufchain(chk->data, outchain, &endoutchain,
8297                                     (int)chk->rec.chunk_id.can_take_data,
8298                                     chk->send_size, chk->copy_by_ref);
8299                                 if (outchain == NULL) {
8300                                         *reason_code = 8;
8301                                         SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
8302                                         return (ENOMEM);
8303                                 }
8304                                 SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8305                                 /* update our MTU size */
8306                                 if (mtu > (chk->send_size + omtu))
8307                                         mtu -= (chk->send_size + omtu);
8308                                 else
8309                                         mtu = 0;
8310                                 to_out += (chk->send_size + omtu);
8311                                 /* Do clear IP_DF ? */
8312                                 if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
8313                                         no_fragmentflg = 0;
8314                                 }
8315                                 if (chk->rec.chunk_id.can_take_data)
8316                                         chk->data = NULL;
8317                                 /* Mark things to be removed, if needed */
8318                                 if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
8319                                     (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK) ||  /* EY */
8320                                     (chk->rec.chunk_id.id == SCTP_HEARTBEAT_REQUEST) ||
8321                                     (chk->rec.chunk_id.id == SCTP_HEARTBEAT_ACK) ||
8322                                     (chk->rec.chunk_id.id == SCTP_SHUTDOWN) ||
8323                                     (chk->rec.chunk_id.id == SCTP_SHUTDOWN_ACK) ||
8324                                     (chk->rec.chunk_id.id == SCTP_OPERATION_ERROR) ||
8325                                     (chk->rec.chunk_id.id == SCTP_COOKIE_ACK) ||
8326                                     (chk->rec.chunk_id.id == SCTP_ECN_CWR) ||
8327                                     (chk->rec.chunk_id.id == SCTP_PACKET_DROPPED) ||
8328                                     (chk->rec.chunk_id.id == SCTP_ASCONF_ACK)) {
8329                                         if (chk->rec.chunk_id.id == SCTP_HEARTBEAT_REQUEST) {
8330                                                 hbflag = 1;
8331                                         }
8332                                         /* remove these chunks at the end */
8333                                         if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
8334                                             (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK)) {
8335                                                 /* turn off the timer */
8336                                                 if (SCTP_OS_TIMER_PENDING(&stcb->asoc.dack_timer.timer)) {
8337                                                         sctp_timer_stop(SCTP_TIMER_TYPE_RECV,
8338                                                             inp, stcb, NULL,
8339                                                             SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_1);
8340                                                 }
8341                                         }
8342                                         ctl_cnt++;
8343                                 } else {
8344                                         /*
8345                                          * Other chunks, since they have
8346                                          * timers running (i.e. COOKIE) we
8347                                          * just "trust" that it gets sent or
8348                                          * retransmitted.
8349                                          */
8350                                         ctl_cnt++;
8351                                         if (chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
8352                                                 cookie = 1;
8353                                                 no_out_cnt = 1;
8354                                         } else if (chk->rec.chunk_id.id == SCTP_ECN_ECHO) {
8355                                                 /*
8356                                                  * Increment ecne send count
8357                                                  * here this means we may be
8358                                                  * over-zealous in our
8359                                                  * counting if the send
8360                                                  * fails, but its the best
8361                                                  * place to do it (we used
8362                                                  * to do it in the queue of
8363                                                  * the chunk, but that did
8364                                                  * not tell how many times
8365                                                  * it was sent.
8366                                                  */
8367                                                 SCTP_STAT_INCR(sctps_sendecne);
8368                                         }
8369                                         chk->sent = SCTP_DATAGRAM_SENT;
8370                                         if (chk->whoTo == NULL) {
8371                                                 chk->whoTo = net;
8372                                                 atomic_add_int(&net->ref_count, 1);
8373                                         }
8374                                         chk->snd_count++;
8375                                 }
8376                                 if (mtu == 0) {
8377                                         /*
8378                                          * Ok we are out of room but we can
8379                                          * output without effecting the
8380                                          * flight size since this little guy
8381                                          * is a control only packet.
8382                                          */
8383                                         if (asconf) {
8384                                                 sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp, stcb, net);
8385                                                 /*
8386                                                  * do NOT clear the asconf
8387                                                  * flag as it is used to do
8388                                                  * appropriate source
8389                                                  * address selection.
8390                                                  */
8391                                         }
8392                                         if (cookie) {
8393                                                 sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, inp, stcb, net);
8394                                                 cookie = 0;
8395                                         }
8396                                         /* Only HB or ASCONF advances time */
8397                                         if (hbflag) {
8398                                                 if (*now_filled == 0) {
8399                                                         (void)SCTP_GETTIME_TIMEVAL(now);
8400                                                         *now_filled = 1;
8401                                                 }
8402                                                 net->last_sent_time = *now;
8403                                                 hbflag = 0;
8404                                         }
8405                                         if ((error = sctp_lowlevel_chunk_output(inp, stcb, net,
8406                                             (struct sockaddr *)&net->ro._l_addr,
8407                                             outchain,
8408                                             auth_offset, auth,
8409                                             stcb->asoc.authinfo.active_keyid,
8410                                             no_fragmentflg, 0, asconf,
8411                                             inp->sctp_lport, stcb->rport,
8412                                             htonl(stcb->asoc.peer_vtag),
8413                                             net->port, NULL,
8414                                             0, 0,
8415                                             so_locked))) {
8416                                                 /*
8417                                                  * error, we could not
8418                                                  * output
8419                                                  */
8420                                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
8421                                                 if (from_where == 0) {
8422                                                         SCTP_STAT_INCR(sctps_lowlevelerrusr);
8423                                                 }
8424                                                 if (error == ENOBUFS) {
8425                                                         asoc->ifp_had_enobuf = 1;
8426                                                         SCTP_STAT_INCR(sctps_lowlevelerr);
8427                                                 }
8428                                                 if (error == EHOSTUNREACH) {
8429                                                         /*
8430                                                          * Destination went
8431                                                          * unreachable
8432                                                          * during this send
8433                                                          */
8434                                                         sctp_move_chunks_from_net(stcb, net);
8435                                                 }
8436                                                 *reason_code = 7;
8437                                                 break;
8438                                         } else {
8439                                                 asoc->ifp_had_enobuf = 0;
8440                                         }
8441                                         /*
8442                                          * increase the number we sent, if a
8443                                          * cookie is sent we don't tell them
8444                                          * any was sent out.
8445                                          */
8446                                         outchain = endoutchain = NULL;
8447                                         auth = NULL;
8448                                         auth_offset = 0;
8449                                         if (!no_out_cnt)
8450                                                 *num_out += ctl_cnt;
8451                                         /* recalc a clean slate and setup */
8452                                         switch (net->ro._l_addr.sa.sa_family) {
8453 #ifdef INET
8454                                         case AF_INET:
8455                                                 mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
8456                                                 break;
8457 #endif
8458 #ifdef INET6
8459                                         case AF_INET6:
8460                                                 mtu = net->mtu - SCTP_MIN_OVERHEAD;
8461                                                 break;
8462 #endif
8463                                         default:
8464                                                 /* TSNH */
8465                                                 mtu = net->mtu;
8466                                                 break;
8467                                         }
8468                                         to_out = 0;
8469                                         no_fragmentflg = 1;
8470                                 }
8471                         }
8472                 }
8473                 if (error != 0) {
8474                         /* try next net */
8475                         continue;
8476                 }
8477                 /* JRI: if dest is in PF state, do not send data to it */
8478                 if ((asoc->sctp_cmt_on_off > 0) &&
8479                     (net != stcb->asoc.alternate) &&
8480                     (net->dest_state & SCTP_ADDR_PF)) {
8481                         goto no_data_fill;
8482                 }
8483                 if (net->flight_size >= net->cwnd) {
8484                         goto no_data_fill;
8485                 }
8486                 if ((asoc->sctp_cmt_on_off > 0) &&
8487                     (SCTP_BASE_SYSCTL(sctp_buffer_splitting) & SCTP_RECV_BUFFER_SPLITTING) &&
8488                     (net->flight_size > max_rwnd_per_dest)) {
8489                         goto no_data_fill;
8490                 }
8491                 /*
8492                  * We need a specific accounting for the usage of the send
8493                  * buffer. We also need to check the number of messages per
8494                  * net. For now, this is better than nothing and it disabled
8495                  * by default...
8496                  */
8497                 if ((asoc->sctp_cmt_on_off > 0) &&
8498                     (SCTP_BASE_SYSCTL(sctp_buffer_splitting) & SCTP_SEND_BUFFER_SPLITTING) &&
8499                     (max_send_per_dest > 0) &&
8500                     (net->flight_size > max_send_per_dest)) {
8501                         goto no_data_fill;
8502                 }
8503                 /*********************/
8504                 /* Data transmission */
8505                 /*********************/
8506                 /*
8507                  * if AUTH for DATA is required and no AUTH has been added
8508                  * yet, account for this in the mtu now... if no data can be
8509                  * bundled, this adjustment won't matter anyways since the
8510                  * packet will be going out...
8511                  */
8512                 data_auth_reqd = sctp_auth_is_required_chunk(SCTP_DATA,
8513                     stcb->asoc.peer_auth_chunks);
8514                 if (data_auth_reqd && (auth == NULL)) {
8515                         mtu -= sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
8516                 }
8517                 /* now lets add any data within the MTU constraints */
8518                 switch (((struct sockaddr *)&net->ro._l_addr)->sa_family) {
8519 #ifdef INET
8520                 case AF_INET:
8521                         if (net->mtu > SCTP_MIN_V4_OVERHEAD)
8522                                 omtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
8523                         else
8524                                 omtu = 0;
8525                         break;
8526 #endif
8527 #ifdef INET6
8528                 case AF_INET6:
8529                         if (net->mtu > SCTP_MIN_OVERHEAD)
8530                                 omtu = net->mtu - SCTP_MIN_OVERHEAD;
8531                         else
8532                                 omtu = 0;
8533                         break;
8534 #endif
8535                 default:
8536                         /* TSNH */
8537                         omtu = 0;
8538                         break;
8539                 }
8540                 if ((((SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) ||
8541                     (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_RECEIVED)) &&
8542                     (skip_data_for_this_net == 0)) ||
8543                     (cookie)) {
8544                         TAILQ_FOREACH_SAFE(chk, &asoc->send_queue, sctp_next, nchk) {
8545                                 if (no_data_chunks) {
8546                                         /* let only control go out */
8547                                         *reason_code = 1;
8548                                         break;
8549                                 }
8550                                 if (net->flight_size >= net->cwnd) {
8551                                         /* skip this net, no room for data */
8552                                         *reason_code = 2;
8553                                         break;
8554                                 }
8555                                 if ((chk->whoTo != NULL) &&
8556                                     (chk->whoTo != net)) {
8557                                         /* Don't send the chunk on this net */
8558                                         continue;
8559                                 }
8560
8561                                 if (asoc->sctp_cmt_on_off == 0) {
8562                                         if ((asoc->alternate) &&
8563                                             (asoc->alternate != net) &&
8564                                             (chk->whoTo == NULL)) {
8565                                                 continue;
8566                                         } else if ((net != asoc->primary_destination) &&
8567                                                     (asoc->alternate == NULL) &&
8568                                             (chk->whoTo == NULL)) {
8569                                                 continue;
8570                                         }
8571                                 }
8572                                 if ((chk->send_size > omtu) && ((chk->flags & CHUNK_FLAGS_FRAGMENT_OK) == 0)) {
8573                                         /*-
8574                                          * strange, we have a chunk that is
8575                                          * to big for its destination and
8576                                          * yet no fragment ok flag.
8577                                          * Something went wrong when the
8578                                          * PMTU changed...we did not mark
8579                                          * this chunk for some reason?? I
8580                                          * will fix it here by letting IP
8581                                          * fragment it for now and printing
8582                                          * a warning. This really should not
8583                                          * happen ...
8584                                          */
8585                                         SCTP_PRINTF("Warning chunk of %d bytes > mtu:%d and yet PMTU disc missed\n",
8586                                             chk->send_size, mtu);
8587                                         chk->flags |= CHUNK_FLAGS_FRAGMENT_OK;
8588                                 }
8589                                 if (SCTP_BASE_SYSCTL(sctp_enable_sack_immediately) &&
8590                                     (asoc->state & SCTP_STATE_SHUTDOWN_PENDING)) {
8591                                         struct sctp_data_chunk *dchkh;
8592
8593                                         dchkh = mtod(chk->data, struct sctp_data_chunk *);
8594                                         dchkh->ch.chunk_flags |= SCTP_DATA_SACK_IMMEDIATELY;
8595                                 }
8596                                 if (((chk->send_size <= mtu) && (chk->send_size <= r_mtu)) ||
8597                                     ((chk->flags & CHUNK_FLAGS_FRAGMENT_OK) && (chk->send_size <= asoc->peers_rwnd))) {
8598                                         /* ok we will add this one */
8599
8600                                         /*
8601                                          * Add an AUTH chunk, if chunk
8602                                          * requires it, save the offset into
8603                                          * the chain for AUTH
8604                                          */
8605                                         if (data_auth_reqd) {
8606                                                 if (auth == NULL) {
8607                                                         outchain = sctp_add_auth_chunk(outchain,
8608                                                             &endoutchain,
8609                                                             &auth,
8610                                                             &auth_offset,
8611                                                             stcb,
8612                                                             SCTP_DATA);
8613                                                         auth_keyid = chk->auth_keyid;
8614                                                         override_ok = 0;
8615                                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8616                                                 } else if (override_ok) {
8617                                                         /*
8618                                                          * use this data's
8619                                                          * keyid
8620                                                          */
8621                                                         auth_keyid = chk->auth_keyid;
8622                                                         override_ok = 0;
8623                                                 } else if (auth_keyid != chk->auth_keyid) {
8624                                                         /*
8625                                                          * different keyid,
8626                                                          * so done bundling
8627                                                          */
8628                                                         break;
8629                                                 }
8630                                         }
8631                                         outchain = sctp_copy_mbufchain(chk->data, outchain, &endoutchain, 0,
8632                                             chk->send_size, chk->copy_by_ref);
8633                                         if (outchain == NULL) {
8634                                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "No memory?\n");
8635                                                 if (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
8636                                                         sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
8637                                                 }
8638                                                 *reason_code = 3;
8639                                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
8640                                                 return (ENOMEM);
8641                                         }
8642                                         /* update our MTU size */
8643                                         /* Do clear IP_DF ? */
8644                                         if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
8645                                                 no_fragmentflg = 0;
8646                                         }
8647                                         /* unsigned subtraction of mtu */
8648                                         if (mtu > chk->send_size)
8649                                                 mtu -= chk->send_size;
8650                                         else
8651                                                 mtu = 0;
8652                                         /* unsigned subtraction of r_mtu */
8653                                         if (r_mtu > chk->send_size)
8654                                                 r_mtu -= chk->send_size;
8655                                         else
8656                                                 r_mtu = 0;
8657
8658                                         to_out += chk->send_size;
8659                                         if ((to_out > mx_mtu) && no_fragmentflg) {
8660 #ifdef INVARIANTS
8661                                                 panic("Exceeding mtu of %d out size is %d", mx_mtu, to_out);
8662 #else
8663                                                 SCTP_PRINTF("Exceeding mtu of %d out size is %d\n",
8664                                                     mx_mtu, to_out);
8665 #endif
8666                                         }
8667                                         chk->window_probe = 0;
8668                                         data_list[bundle_at++] = chk;
8669                                         if (bundle_at >= SCTP_MAX_DATA_BUNDLING) {
8670                                                 break;
8671                                         }
8672                                         if (chk->sent == SCTP_DATAGRAM_UNSENT) {
8673                                                 if ((chk->rec.data.rcv_flags & SCTP_DATA_UNORDERED) == 0) {
8674                                                         SCTP_STAT_INCR_COUNTER64(sctps_outorderchunks);
8675                                                 } else {
8676                                                         SCTP_STAT_INCR_COUNTER64(sctps_outunorderchunks);
8677                                                 }
8678                                                 if (((chk->rec.data.rcv_flags & SCTP_DATA_LAST_FRAG) == SCTP_DATA_LAST_FRAG) &&
8679                                                     ((chk->rec.data.rcv_flags & SCTP_DATA_FIRST_FRAG) == 0))
8680                                                         /*
8681                                                          * Count number of
8682                                                          * user msg's that
8683                                                          * were fragmented
8684                                                          * we do this by
8685                                                          * counting when we
8686                                                          * see a LAST
8687                                                          * fragment only.
8688                                                          */
8689                                                         SCTP_STAT_INCR_COUNTER64(sctps_fragusrmsgs);
8690                                         }
8691                                         if ((mtu == 0) || (r_mtu == 0) || (one_chunk)) {
8692                                                 if ((one_chunk) && (stcb->asoc.total_flight == 0)) {
8693                                                         data_list[0]->window_probe = 1;
8694                                                         net->window_probe = 1;
8695                                                 }
8696                                                 break;
8697                                         }
8698                                 } else {
8699                                         /*
8700                                          * Must be sent in order of the
8701                                          * TSN's (on a network)
8702                                          */
8703                                         break;
8704                                 }
8705                         }       /* for (chunk gather loop for this net) */
8706                 }               /* if asoc.state OPEN */
8707 no_data_fill:
8708                 /* Is there something to send for this destination? */
8709                 if (outchain) {
8710                         /* We may need to start a control timer or two */
8711                         if (asconf) {
8712                                 sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp,
8713                                     stcb, net);
8714                                 /*
8715                                  * do NOT clear the asconf flag as it is
8716                                  * used to do appropriate source address
8717                                  * selection.
8718                                  */
8719                         }
8720                         if (cookie) {
8721                                 sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, inp, stcb, net);
8722                                 cookie = 0;
8723                         }
8724                         /* must start a send timer if data is being sent */
8725                         if (bundle_at && (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer))) {
8726                                 /*
8727                                  * no timer running on this destination
8728                                  * restart it.
8729                                  */
8730                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
8731                         }
8732                         if (bundle_at || hbflag) {
8733                                 /* For data/asconf and hb set time */
8734                                 if (*now_filled == 0) {
8735                                         (void)SCTP_GETTIME_TIMEVAL(now);
8736                                         *now_filled = 1;
8737                                 }
8738                                 net->last_sent_time = *now;
8739                         }
8740                         /* Now send it, if there is anything to send :> */
8741                         if ((error = sctp_lowlevel_chunk_output(inp,
8742                             stcb,
8743                             net,
8744                             (struct sockaddr *)&net->ro._l_addr,
8745                             outchain,
8746                             auth_offset,
8747                             auth,
8748                             auth_keyid,
8749                             no_fragmentflg,
8750                             bundle_at,
8751                             asconf,
8752                             inp->sctp_lport, stcb->rport,
8753                             htonl(stcb->asoc.peer_vtag),
8754                             net->port, NULL,
8755                             0, 0,
8756                             so_locked))) {
8757                                 /* error, we could not output */
8758                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
8759                                 if (from_where == 0) {
8760                                         SCTP_STAT_INCR(sctps_lowlevelerrusr);
8761                                 }
8762                                 if (error == ENOBUFS) {
8763                                         asoc->ifp_had_enobuf = 1;
8764                                         SCTP_STAT_INCR(sctps_lowlevelerr);
8765                                 }
8766                                 if (error == EHOSTUNREACH) {
8767                                         /*
8768                                          * Destination went unreachable
8769                                          * during this send
8770                                          */
8771                                         sctp_move_chunks_from_net(stcb, net);
8772                                 }
8773                                 *reason_code = 6;
8774                                 /*-
8775                                  * I add this line to be paranoid. As far as
8776                                  * I can tell the continue, takes us back to
8777                                  * the top of the for, but just to make sure
8778                                  * I will reset these again here.
8779                                  */
8780                                 ctl_cnt = 0;
8781                                 continue;       /* This takes us back to the
8782                                                  * for() for the nets. */
8783                         } else {
8784                                 asoc->ifp_had_enobuf = 0;
8785                         }
8786                         endoutchain = NULL;
8787                         auth = NULL;
8788                         auth_offset = 0;
8789                         if (!no_out_cnt) {
8790                                 *num_out += (ctl_cnt + bundle_at);
8791                         }
8792                         if (bundle_at) {
8793                                 /* setup for a RTO measurement */
8794                                 tsns_sent = data_list[0]->rec.data.tsn;
8795                                 /* fill time if not already filled */
8796                                 if (*now_filled == 0) {
8797                                         (void)SCTP_GETTIME_TIMEVAL(&asoc->time_last_sent);
8798                                         *now_filled = 1;
8799                                         *now = asoc->time_last_sent;
8800                                 } else {
8801                                         asoc->time_last_sent = *now;
8802                                 }
8803                                 if (net->rto_needed) {
8804                                         data_list[0]->do_rtt = 1;
8805                                         net->rto_needed = 0;
8806                                 }
8807                                 SCTP_STAT_INCR_BY(sctps_senddata, bundle_at);
8808                                 sctp_clean_up_datalist(stcb, asoc, data_list, bundle_at, net);
8809                         }
8810                         if (one_chunk) {
8811                                 break;
8812                         }
8813                 }
8814                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
8815                         sctp_log_cwnd(stcb, net, tsns_sent, SCTP_CWND_LOG_FROM_SEND);
8816                 }
8817         }
8818         if (old_start_at == NULL) {
8819                 old_start_at = start_at;
8820                 start_at = TAILQ_FIRST(&asoc->nets);
8821                 if (old_start_at)
8822                         goto again_one_more_time;
8823         }
8824
8825         /*
8826          * At the end there should be no NON timed chunks hanging on this
8827          * queue.
8828          */
8829         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
8830                 sctp_log_cwnd(stcb, net, *num_out, SCTP_CWND_LOG_FROM_SEND);
8831         }
8832         if ((*num_out == 0) && (*reason_code == 0)) {
8833                 *reason_code = 4;
8834         } else {
8835                 *reason_code = 5;
8836         }
8837         sctp_clean_up_ctl(stcb, asoc, so_locked);
8838         return (0);
8839 }
8840
8841 void
8842 sctp_queue_op_err(struct sctp_tcb *stcb, struct mbuf *op_err)
8843 {
8844         /*-
8845          * Prepend a OPERATIONAL_ERROR chunk header and put on the end of
8846          * the control chunk queue.
8847          */
8848         struct sctp_chunkhdr *hdr;
8849         struct sctp_tmit_chunk *chk;
8850         struct mbuf *mat, *last_mbuf;
8851         uint32_t chunk_length;
8852         uint16_t padding_length;
8853
8854         SCTP_TCB_LOCK_ASSERT(stcb);
8855         SCTP_BUF_PREPEND(op_err, sizeof(struct sctp_chunkhdr), M_NOWAIT);
8856         if (op_err == NULL) {
8857                 return;
8858         }
8859         last_mbuf = NULL;
8860         chunk_length = 0;
8861         for (mat = op_err; mat != NULL; mat = SCTP_BUF_NEXT(mat)) {
8862                 chunk_length += SCTP_BUF_LEN(mat);
8863                 if (SCTP_BUF_NEXT(mat) == NULL) {
8864                         last_mbuf = mat;
8865                 }
8866         }
8867         if (chunk_length > SCTP_MAX_CHUNK_LENGTH) {
8868                 sctp_m_freem(op_err);
8869                 return;
8870         }
8871         padding_length = chunk_length % 4;
8872         if (padding_length != 0) {
8873                 padding_length = 4 - padding_length;
8874         }
8875         if (padding_length != 0) {
8876                 if (sctp_add_pad_tombuf(last_mbuf, padding_length) == NULL) {
8877                         sctp_m_freem(op_err);
8878                         return;
8879                 }
8880         }
8881         sctp_alloc_a_chunk(stcb, chk);
8882         if (chk == NULL) {
8883                 /* no memory */
8884                 sctp_m_freem(op_err);
8885                 return;
8886         }
8887         chk->copy_by_ref = 0;
8888         chk->rec.chunk_id.id = SCTP_OPERATION_ERROR;
8889         chk->rec.chunk_id.can_take_data = 0;
8890         chk->flags = 0;
8891         chk->send_size = (uint16_t)chunk_length;
8892         chk->sent = SCTP_DATAGRAM_UNSENT;
8893         chk->snd_count = 0;
8894         chk->asoc = &stcb->asoc;
8895         chk->data = op_err;
8896         chk->whoTo = NULL;
8897         hdr = mtod(op_err, struct sctp_chunkhdr *);
8898         hdr->chunk_type = SCTP_OPERATION_ERROR;
8899         hdr->chunk_flags = 0;
8900         hdr->chunk_length = htons(chk->send_size);
8901         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
8902         chk->asoc->ctrl_queue_cnt++;
8903 }
8904
8905 int
8906 sctp_send_cookie_echo(struct mbuf *m,
8907     int offset, int limit,
8908     struct sctp_tcb *stcb,
8909     struct sctp_nets *net)
8910 {
8911         /*-
8912          * pull out the cookie and put it at the front of the control chunk
8913          * queue.
8914          */
8915         int at;
8916         struct mbuf *cookie;
8917         struct sctp_paramhdr param, *phdr;
8918         struct sctp_chunkhdr *hdr;
8919         struct sctp_tmit_chunk *chk;
8920         uint16_t ptype, plen;
8921
8922         SCTP_TCB_LOCK_ASSERT(stcb);
8923         /* First find the cookie in the param area */
8924         cookie = NULL;
8925         at = offset + sizeof(struct sctp_init_chunk);
8926         for (;;) {
8927                 phdr = sctp_get_next_param(m, at, &param, sizeof(param));
8928                 if (phdr == NULL) {
8929                         return (-3);
8930                 }
8931                 ptype = ntohs(phdr->param_type);
8932                 plen = ntohs(phdr->param_length);
8933                 if (plen < sizeof(struct sctp_paramhdr)) {
8934                         return (-6);
8935                 }
8936                 if (ptype == SCTP_STATE_COOKIE) {
8937                         int pad;
8938
8939                         /* found the cookie */
8940                         if (at + plen > limit) {
8941                                 return (-7);
8942                         }
8943                         cookie = SCTP_M_COPYM(m, at, plen, M_NOWAIT);
8944                         if (cookie == NULL) {
8945                                 /* No memory */
8946                                 return (-2);
8947                         }
8948                         if ((pad = (plen % 4)) > 0) {
8949                                 pad = 4 - pad;
8950                         }
8951                         if (pad > 0) {
8952                                 if (sctp_pad_lastmbuf(cookie, pad, NULL) == NULL) {
8953                                         return (-8);
8954                                 }
8955                         }
8956 #ifdef SCTP_MBUF_LOGGING
8957                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
8958                                 sctp_log_mbc(cookie, SCTP_MBUF_ICOPY);
8959                         }
8960 #endif
8961                         break;
8962                 }
8963                 at += SCTP_SIZE32(plen);
8964         }
8965         /* ok, we got the cookie lets change it into a cookie echo chunk */
8966         /* first the change from param to cookie */
8967         hdr = mtod(cookie, struct sctp_chunkhdr *);
8968         hdr->chunk_type = SCTP_COOKIE_ECHO;
8969         hdr->chunk_flags = 0;
8970         /* get the chunk stuff now and place it in the FRONT of the queue */
8971         sctp_alloc_a_chunk(stcb, chk);
8972         if (chk == NULL) {
8973                 /* no memory */
8974                 sctp_m_freem(cookie);
8975                 return (-5);
8976         }
8977         chk->copy_by_ref = 0;
8978         chk->rec.chunk_id.id = SCTP_COOKIE_ECHO;
8979         chk->rec.chunk_id.can_take_data = 0;
8980         chk->flags = CHUNK_FLAGS_FRAGMENT_OK;
8981         chk->send_size = SCTP_SIZE32(plen);
8982         chk->sent = SCTP_DATAGRAM_UNSENT;
8983         chk->snd_count = 0;
8984         chk->asoc = &stcb->asoc;
8985         chk->data = cookie;
8986         chk->whoTo = net;
8987         atomic_add_int(&chk->whoTo->ref_count, 1);
8988         TAILQ_INSERT_HEAD(&chk->asoc->control_send_queue, chk, sctp_next);
8989         chk->asoc->ctrl_queue_cnt++;
8990         return (0);
8991 }
8992
8993 void
8994 sctp_send_heartbeat_ack(struct sctp_tcb *stcb,
8995     struct mbuf *m,
8996     int offset,
8997     int chk_length,
8998     struct sctp_nets *net)
8999 {
9000         /*
9001          * take a HB request and make it into a HB ack and send it.
9002          */
9003         struct mbuf *outchain;
9004         struct sctp_chunkhdr *chdr;
9005         struct sctp_tmit_chunk *chk;
9006
9007         if (net == NULL)
9008                 /* must have a net pointer */
9009                 return;
9010
9011         outchain = SCTP_M_COPYM(m, offset, chk_length, M_NOWAIT);
9012         if (outchain == NULL) {
9013                 /* gak out of memory */
9014                 return;
9015         }
9016 #ifdef SCTP_MBUF_LOGGING
9017         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
9018                 sctp_log_mbc(outchain, SCTP_MBUF_ICOPY);
9019         }
9020 #endif
9021         chdr = mtod(outchain, struct sctp_chunkhdr *);
9022         chdr->chunk_type = SCTP_HEARTBEAT_ACK;
9023         chdr->chunk_flags = 0;
9024         if (chk_length % 4 != 0) {
9025                 sctp_pad_lastmbuf(outchain, 4 - (chk_length % 4), NULL);
9026         }
9027         sctp_alloc_a_chunk(stcb, chk);
9028         if (chk == NULL) {
9029                 /* no memory */
9030                 sctp_m_freem(outchain);
9031                 return;
9032         }
9033         chk->copy_by_ref = 0;
9034         chk->rec.chunk_id.id = SCTP_HEARTBEAT_ACK;
9035         chk->rec.chunk_id.can_take_data = 1;
9036         chk->flags = 0;
9037         chk->send_size = chk_length;
9038         chk->sent = SCTP_DATAGRAM_UNSENT;
9039         chk->snd_count = 0;
9040         chk->asoc = &stcb->asoc;
9041         chk->data = outchain;
9042         chk->whoTo = net;
9043         atomic_add_int(&chk->whoTo->ref_count, 1);
9044         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9045         chk->asoc->ctrl_queue_cnt++;
9046 }
9047
9048 void
9049 sctp_send_cookie_ack(struct sctp_tcb *stcb)
9050 {
9051         /* formulate and queue a cookie-ack back to sender */
9052         struct mbuf *cookie_ack;
9053         struct sctp_chunkhdr *hdr;
9054         struct sctp_tmit_chunk *chk;
9055
9056         SCTP_TCB_LOCK_ASSERT(stcb);
9057
9058         cookie_ack = sctp_get_mbuf_for_msg(sizeof(struct sctp_chunkhdr), 0, M_NOWAIT, 1, MT_HEADER);
9059         if (cookie_ack == NULL) {
9060                 /* no mbuf's */
9061                 return;
9062         }
9063         SCTP_BUF_RESV_UF(cookie_ack, SCTP_MIN_OVERHEAD);
9064         sctp_alloc_a_chunk(stcb, chk);
9065         if (chk == NULL) {
9066                 /* no memory */
9067                 sctp_m_freem(cookie_ack);
9068                 return;
9069         }
9070         chk->copy_by_ref = 0;
9071         chk->rec.chunk_id.id = SCTP_COOKIE_ACK;
9072         chk->rec.chunk_id.can_take_data = 1;
9073         chk->flags = 0;
9074         chk->send_size = sizeof(struct sctp_chunkhdr);
9075         chk->sent = SCTP_DATAGRAM_UNSENT;
9076         chk->snd_count = 0;
9077         chk->asoc = &stcb->asoc;
9078         chk->data = cookie_ack;
9079         if (chk->asoc->last_control_chunk_from != NULL) {
9080                 chk->whoTo = chk->asoc->last_control_chunk_from;
9081                 atomic_add_int(&chk->whoTo->ref_count, 1);
9082         } else {
9083                 chk->whoTo = NULL;
9084         }
9085         hdr = mtod(cookie_ack, struct sctp_chunkhdr *);
9086         hdr->chunk_type = SCTP_COOKIE_ACK;
9087         hdr->chunk_flags = 0;
9088         hdr->chunk_length = htons(chk->send_size);
9089         SCTP_BUF_LEN(cookie_ack) = chk->send_size;
9090         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9091         chk->asoc->ctrl_queue_cnt++;
9092         return;
9093 }
9094
9095 void
9096 sctp_send_shutdown_ack(struct sctp_tcb *stcb, struct sctp_nets *net)
9097 {
9098         /* formulate and queue a SHUTDOWN-ACK back to the sender */
9099         struct mbuf *m_shutdown_ack;
9100         struct sctp_shutdown_ack_chunk *ack_cp;
9101         struct sctp_tmit_chunk *chk;
9102
9103         m_shutdown_ack = sctp_get_mbuf_for_msg(sizeof(struct sctp_shutdown_ack_chunk), 0, M_NOWAIT, 1, MT_HEADER);
9104         if (m_shutdown_ack == NULL) {
9105                 /* no mbuf's */
9106                 return;
9107         }
9108         SCTP_BUF_RESV_UF(m_shutdown_ack, SCTP_MIN_OVERHEAD);
9109         sctp_alloc_a_chunk(stcb, chk);
9110         if (chk == NULL) {
9111                 /* no memory */
9112                 sctp_m_freem(m_shutdown_ack);
9113                 return;
9114         }
9115         chk->copy_by_ref = 0;
9116         chk->rec.chunk_id.id = SCTP_SHUTDOWN_ACK;
9117         chk->rec.chunk_id.can_take_data = 1;
9118         chk->flags = 0;
9119         chk->send_size = sizeof(struct sctp_chunkhdr);
9120         chk->sent = SCTP_DATAGRAM_UNSENT;
9121         chk->snd_count = 0;
9122         chk->asoc = &stcb->asoc;
9123         chk->data = m_shutdown_ack;
9124         chk->whoTo = net;
9125         if (chk->whoTo) {
9126                 atomic_add_int(&chk->whoTo->ref_count, 1);
9127         }
9128         ack_cp = mtod(m_shutdown_ack, struct sctp_shutdown_ack_chunk *);
9129         ack_cp->ch.chunk_type = SCTP_SHUTDOWN_ACK;
9130         ack_cp->ch.chunk_flags = 0;
9131         ack_cp->ch.chunk_length = htons(chk->send_size);
9132         SCTP_BUF_LEN(m_shutdown_ack) = chk->send_size;
9133         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9134         chk->asoc->ctrl_queue_cnt++;
9135         return;
9136 }
9137
9138 void
9139 sctp_send_shutdown(struct sctp_tcb *stcb, struct sctp_nets *net)
9140 {
9141         /* formulate and queue a SHUTDOWN to the sender */
9142         struct mbuf *m_shutdown;
9143         struct sctp_shutdown_chunk *shutdown_cp;
9144         struct sctp_tmit_chunk *chk;
9145
9146         TAILQ_FOREACH(chk, &stcb->asoc.control_send_queue, sctp_next) {
9147                 if (chk->rec.chunk_id.id == SCTP_SHUTDOWN) {
9148                         /* We already have a SHUTDOWN queued. Reuse it. */
9149                         if (chk->whoTo) {
9150                                 sctp_free_remote_addr(chk->whoTo);
9151                                 chk->whoTo = NULL;
9152                         }
9153                         break;
9154                 }
9155         }
9156         if (chk == NULL) {
9157                 m_shutdown = sctp_get_mbuf_for_msg(sizeof(struct sctp_shutdown_chunk), 0, M_NOWAIT, 1, MT_HEADER);
9158                 if (m_shutdown == NULL) {
9159                         /* no mbuf's */
9160                         return;
9161                 }
9162                 SCTP_BUF_RESV_UF(m_shutdown, SCTP_MIN_OVERHEAD);
9163                 sctp_alloc_a_chunk(stcb, chk);
9164                 if (chk == NULL) {
9165                         /* no memory */
9166                         sctp_m_freem(m_shutdown);
9167                         return;
9168                 }
9169                 chk->copy_by_ref = 0;
9170                 chk->rec.chunk_id.id = SCTP_SHUTDOWN;
9171                 chk->rec.chunk_id.can_take_data = 1;
9172                 chk->flags = 0;
9173                 chk->send_size = sizeof(struct sctp_shutdown_chunk);
9174                 chk->sent = SCTP_DATAGRAM_UNSENT;
9175                 chk->snd_count = 0;
9176                 chk->asoc = &stcb->asoc;
9177                 chk->data = m_shutdown;
9178                 chk->whoTo = net;
9179                 if (chk->whoTo) {
9180                         atomic_add_int(&chk->whoTo->ref_count, 1);
9181                 }
9182                 shutdown_cp = mtod(m_shutdown, struct sctp_shutdown_chunk *);
9183                 shutdown_cp->ch.chunk_type = SCTP_SHUTDOWN;
9184                 shutdown_cp->ch.chunk_flags = 0;
9185                 shutdown_cp->ch.chunk_length = htons(chk->send_size);
9186                 shutdown_cp->cumulative_tsn_ack = htonl(stcb->asoc.cumulative_tsn);
9187                 SCTP_BUF_LEN(m_shutdown) = chk->send_size;
9188                 TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9189                 chk->asoc->ctrl_queue_cnt++;
9190         } else {
9191                 TAILQ_REMOVE(&stcb->asoc.control_send_queue, chk, sctp_next);
9192                 chk->whoTo = net;
9193                 if (chk->whoTo) {
9194                         atomic_add_int(&chk->whoTo->ref_count, 1);
9195                 }
9196                 shutdown_cp = mtod(chk->data, struct sctp_shutdown_chunk *);
9197                 shutdown_cp->cumulative_tsn_ack = htonl(stcb->asoc.cumulative_tsn);
9198                 TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
9199         }
9200         return;
9201 }
9202
9203 void
9204 sctp_send_asconf(struct sctp_tcb *stcb, struct sctp_nets *net, int addr_locked)
9205 {
9206         /*
9207          * formulate and queue an ASCONF to the peer. ASCONF parameters
9208          * should be queued on the assoc queue.
9209          */
9210         struct sctp_tmit_chunk *chk;
9211         struct mbuf *m_asconf;
9212         int len;
9213
9214         SCTP_TCB_LOCK_ASSERT(stcb);
9215
9216         if ((!TAILQ_EMPTY(&stcb->asoc.asconf_send_queue)) &&
9217             (!sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_MULTIPLE_ASCONFS))) {
9218                 /* can't send a new one if there is one in flight already */
9219                 return;
9220         }
9221
9222         /* compose an ASCONF chunk, maximum length is PMTU */
9223         m_asconf = sctp_compose_asconf(stcb, &len, addr_locked);
9224         if (m_asconf == NULL) {
9225                 return;
9226         }
9227
9228         sctp_alloc_a_chunk(stcb, chk);
9229         if (chk == NULL) {
9230                 /* no memory */
9231                 sctp_m_freem(m_asconf);
9232                 return;
9233         }
9234
9235         chk->copy_by_ref = 0;
9236         chk->rec.chunk_id.id = SCTP_ASCONF;
9237         chk->rec.chunk_id.can_take_data = 0;
9238         chk->flags = CHUNK_FLAGS_FRAGMENT_OK;
9239         chk->data = m_asconf;
9240         chk->send_size = len;
9241         chk->sent = SCTP_DATAGRAM_UNSENT;
9242         chk->snd_count = 0;
9243         chk->asoc = &stcb->asoc;
9244         chk->whoTo = net;
9245         if (chk->whoTo) {
9246                 atomic_add_int(&chk->whoTo->ref_count, 1);
9247         }
9248         TAILQ_INSERT_TAIL(&chk->asoc->asconf_send_queue, chk, sctp_next);
9249         chk->asoc->ctrl_queue_cnt++;
9250         return;
9251 }
9252
9253 void
9254 sctp_send_asconf_ack(struct sctp_tcb *stcb)
9255 {
9256         /*
9257          * formulate and queue a asconf-ack back to sender. the asconf-ack
9258          * must be stored in the tcb.
9259          */
9260         struct sctp_tmit_chunk *chk;
9261         struct sctp_asconf_ack *ack, *latest_ack;
9262         struct mbuf *m_ack;
9263         struct sctp_nets *net = NULL;
9264
9265         SCTP_TCB_LOCK_ASSERT(stcb);
9266         /* Get the latest ASCONF-ACK */
9267         latest_ack = TAILQ_LAST(&stcb->asoc.asconf_ack_sent, sctp_asconf_ackhead);
9268         if (latest_ack == NULL) {
9269                 return;
9270         }
9271         if (latest_ack->last_sent_to != NULL &&
9272             latest_ack->last_sent_to == stcb->asoc.last_control_chunk_from) {
9273                 /* we're doing a retransmission */
9274                 net = sctp_find_alternate_net(stcb, stcb->asoc.last_control_chunk_from, 0);
9275                 if (net == NULL) {
9276                         /* no alternate */
9277                         if (stcb->asoc.last_control_chunk_from == NULL) {
9278                                 if (stcb->asoc.alternate) {
9279                                         net = stcb->asoc.alternate;
9280                                 } else {
9281                                         net = stcb->asoc.primary_destination;
9282                                 }
9283                         } else {
9284                                 net = stcb->asoc.last_control_chunk_from;
9285                         }
9286                 }
9287         } else {
9288                 /* normal case */
9289                 if (stcb->asoc.last_control_chunk_from == NULL) {
9290                         if (stcb->asoc.alternate) {
9291                                 net = stcb->asoc.alternate;
9292                         } else {
9293                                 net = stcb->asoc.primary_destination;
9294                         }
9295                 } else {
9296                         net = stcb->asoc.last_control_chunk_from;
9297                 }
9298         }
9299         latest_ack->last_sent_to = net;
9300
9301         TAILQ_FOREACH(ack, &stcb->asoc.asconf_ack_sent, next) {
9302                 if (ack->data == NULL) {
9303                         continue;
9304                 }
9305
9306                 /* copy the asconf_ack */
9307                 m_ack = SCTP_M_COPYM(ack->data, 0, M_COPYALL, M_NOWAIT);
9308                 if (m_ack == NULL) {
9309                         /* couldn't copy it */
9310                         return;
9311                 }
9312 #ifdef SCTP_MBUF_LOGGING
9313                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
9314                         sctp_log_mbc(m_ack, SCTP_MBUF_ICOPY);
9315                 }
9316 #endif
9317
9318                 sctp_alloc_a_chunk(stcb, chk);
9319                 if (chk == NULL) {
9320                         /* no memory */
9321                         if (m_ack)
9322                                 sctp_m_freem(m_ack);
9323                         return;
9324                 }
9325                 chk->copy_by_ref = 0;
9326                 chk->rec.chunk_id.id = SCTP_ASCONF_ACK;
9327                 chk->rec.chunk_id.can_take_data = 1;
9328                 chk->flags = CHUNK_FLAGS_FRAGMENT_OK;
9329                 chk->whoTo = net;
9330                 if (chk->whoTo) {
9331                         atomic_add_int(&chk->whoTo->ref_count, 1);
9332                 }
9333                 chk->data = m_ack;
9334                 chk->send_size = ack->len;
9335                 chk->sent = SCTP_DATAGRAM_UNSENT;
9336                 chk->snd_count = 0;
9337                 chk->asoc = &stcb->asoc;
9338
9339                 TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9340                 chk->asoc->ctrl_queue_cnt++;
9341         }
9342         return;
9343 }
9344
9345 static int
9346 sctp_chunk_retransmission(struct sctp_inpcb *inp,
9347     struct sctp_tcb *stcb,
9348     struct sctp_association *asoc,
9349     int *cnt_out, struct timeval *now, int *now_filled, int *fr_done, int so_locked)
9350 {
9351         /*-
9352          * send out one MTU of retransmission. If fast_retransmit is
9353          * happening we ignore the cwnd. Otherwise we obey the cwnd and
9354          * rwnd. For a Cookie or Asconf in the control chunk queue we
9355          * retransmit them by themselves.
9356          *
9357          * For data chunks we will pick out the lowest TSN's in the sent_queue
9358          * marked for resend and bundle them all together (up to a MTU of
9359          * destination). The address to send to should have been
9360          * selected/changed where the retransmission was marked (i.e. in FR
9361          * or t3-timeout routines).
9362          */
9363         struct sctp_tmit_chunk *data_list[SCTP_MAX_DATA_BUNDLING];
9364         struct sctp_tmit_chunk *chk, *fwd;
9365         struct mbuf *m, *endofchain;
9366         struct sctp_nets *net = NULL;
9367         uint32_t tsns_sent = 0;
9368         int no_fragmentflg, bundle_at, cnt_thru;
9369         unsigned int mtu;
9370         int error, i, one_chunk, fwd_tsn, ctl_cnt, tmr_started;
9371         struct sctp_auth_chunk *auth = NULL;
9372         uint32_t auth_offset = 0;
9373         uint16_t auth_keyid;
9374         int override_ok = 1;
9375         int data_auth_reqd = 0;
9376         uint32_t dmtu = 0;
9377
9378         SCTP_TCB_LOCK_ASSERT(stcb);
9379         tmr_started = ctl_cnt = 0;
9380         no_fragmentflg = 1;
9381         fwd_tsn = 0;
9382         *cnt_out = 0;
9383         fwd = NULL;
9384         endofchain = m = NULL;
9385         auth_keyid = stcb->asoc.authinfo.active_keyid;
9386 #ifdef SCTP_AUDITING_ENABLED
9387         sctp_audit_log(0xC3, 1);
9388 #endif
9389         if ((TAILQ_EMPTY(&asoc->sent_queue)) &&
9390             (TAILQ_EMPTY(&asoc->control_send_queue))) {
9391                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "SCTP hits empty queue with cnt set to %d?\n",
9392                     asoc->sent_queue_retran_cnt);
9393                 asoc->sent_queue_cnt = 0;
9394                 asoc->sent_queue_cnt_removeable = 0;
9395                 /* send back 0/0 so we enter normal transmission */
9396                 *cnt_out = 0;
9397                 return (0);
9398         }
9399         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
9400                 if ((chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) ||
9401                     (chk->rec.chunk_id.id == SCTP_STREAM_RESET) ||
9402                     (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN)) {
9403                         if (chk->sent != SCTP_DATAGRAM_RESEND) {
9404                                 continue;
9405                         }
9406                         if (chk->rec.chunk_id.id == SCTP_STREAM_RESET) {
9407                                 if (chk != asoc->str_reset) {
9408                                         /*
9409                                          * not eligible for retran if its
9410                                          * not ours
9411                                          */
9412                                         continue;
9413                                 }
9414                         }
9415                         ctl_cnt++;
9416                         if (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN) {
9417                                 fwd_tsn = 1;
9418                         }
9419                         /*
9420                          * Add an AUTH chunk, if chunk requires it save the
9421                          * offset into the chain for AUTH
9422                          */
9423                         if ((auth == NULL) &&
9424                             (sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
9425                             stcb->asoc.peer_auth_chunks))) {
9426                                 m = sctp_add_auth_chunk(m, &endofchain,
9427                                     &auth, &auth_offset,
9428                                     stcb,
9429                                     chk->rec.chunk_id.id);
9430                                 SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
9431                         }
9432                         m = sctp_copy_mbufchain(chk->data, m, &endofchain, 0, chk->send_size, chk->copy_by_ref);
9433                         break;
9434                 }
9435         }
9436         one_chunk = 0;
9437         cnt_thru = 0;
9438         /* do we have control chunks to retransmit? */
9439         if (m != NULL) {
9440                 /* Start a timer no matter if we succeed or fail */
9441                 if (chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
9442                         sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, inp, stcb, chk->whoTo);
9443                 } else if (chk->rec.chunk_id.id == SCTP_ASCONF)
9444                         sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp, stcb, chk->whoTo);
9445                 chk->snd_count++;       /* update our count */
9446                 if ((error = sctp_lowlevel_chunk_output(inp, stcb, chk->whoTo,
9447                     (struct sockaddr *)&chk->whoTo->ro._l_addr, m,
9448                     auth_offset, auth, stcb->asoc.authinfo.active_keyid,
9449                     no_fragmentflg, 0, 0,
9450                     inp->sctp_lport, stcb->rport, htonl(stcb->asoc.peer_vtag),
9451                     chk->whoTo->port, NULL,
9452                     0, 0,
9453                     so_locked))) {
9454                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
9455                         if (error == ENOBUFS) {
9456                                 asoc->ifp_had_enobuf = 1;
9457                                 SCTP_STAT_INCR(sctps_lowlevelerr);
9458                         }
9459                         return (error);
9460                 } else {
9461                         asoc->ifp_had_enobuf = 0;
9462                 }
9463                 endofchain = NULL;
9464                 auth = NULL;
9465                 auth_offset = 0;
9466                 /*
9467                  * We don't want to mark the net->sent time here since this
9468                  * we use this for HB and retrans cannot measure RTT
9469                  */
9470                 /* (void)SCTP_GETTIME_TIMEVAL(&chk->whoTo->last_sent_time); */
9471                 *cnt_out += 1;
9472                 chk->sent = SCTP_DATAGRAM_SENT;
9473                 sctp_ucount_decr(stcb->asoc.sent_queue_retran_cnt);
9474                 if (fwd_tsn == 0) {
9475                         return (0);
9476                 } else {
9477                         /* Clean up the fwd-tsn list */
9478                         sctp_clean_up_ctl(stcb, asoc, so_locked);
9479                         return (0);
9480                 }
9481         }
9482         /*
9483          * Ok, it is just data retransmission we need to do or that and a
9484          * fwd-tsn with it all.
9485          */
9486         if (TAILQ_EMPTY(&asoc->sent_queue)) {
9487                 return (SCTP_RETRAN_DONE);
9488         }
9489         if ((SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED) ||
9490             (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_WAIT)) {
9491                 /* not yet open, resend the cookie and that is it */
9492                 return (1);
9493         }
9494 #ifdef SCTP_AUDITING_ENABLED
9495         sctp_auditing(20, inp, stcb, NULL);
9496 #endif
9497         data_auth_reqd = sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks);
9498         TAILQ_FOREACH(chk, &asoc->sent_queue, sctp_next) {
9499                 if (chk->sent != SCTP_DATAGRAM_RESEND) {
9500                         /* No, not sent to this net or not ready for rtx */
9501                         continue;
9502                 }
9503                 if (chk->data == NULL) {
9504                         SCTP_PRINTF("TSN:%x chk->snd_count:%d chk->sent:%d can't retran - no data\n",
9505                             chk->rec.data.tsn, chk->snd_count, chk->sent);
9506                         continue;
9507                 }
9508                 if ((SCTP_BASE_SYSCTL(sctp_max_retran_chunk)) &&
9509                     (chk->snd_count >= SCTP_BASE_SYSCTL(sctp_max_retran_chunk))) {
9510                         struct mbuf *op_err;
9511                         char msg[SCTP_DIAG_INFO_LEN];
9512
9513                         SCTP_SNPRINTF(msg, sizeof(msg), "TSN %8.8x retransmitted %d times, giving up",
9514                             chk->rec.data.tsn, chk->snd_count);
9515                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
9516                             msg);
9517                         atomic_add_int(&stcb->asoc.refcnt, 1);
9518                         sctp_abort_an_association(stcb->sctp_ep, stcb, op_err,
9519                             false, so_locked);
9520                         SCTP_TCB_LOCK(stcb);
9521                         atomic_subtract_int(&stcb->asoc.refcnt, 1);
9522                         return (SCTP_RETRAN_EXIT);
9523                 }
9524                 /* pick up the net */
9525                 net = chk->whoTo;
9526                 switch (net->ro._l_addr.sa.sa_family) {
9527 #ifdef INET
9528                 case AF_INET:
9529                         mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
9530                         break;
9531 #endif
9532 #ifdef INET6
9533                 case AF_INET6:
9534                         mtu = net->mtu - SCTP_MIN_OVERHEAD;
9535                         break;
9536 #endif
9537                 default:
9538                         /* TSNH */
9539                         mtu = net->mtu;
9540                         break;
9541                 }
9542
9543                 if ((asoc->peers_rwnd < mtu) && (asoc->total_flight > 0)) {
9544                         /* No room in peers rwnd */
9545                         uint32_t tsn;
9546
9547                         tsn = asoc->last_acked_seq + 1;
9548                         if (tsn == chk->rec.data.tsn) {
9549                                 /*
9550                                  * we make a special exception for this
9551                                  * case. The peer has no rwnd but is missing
9552                                  * the lowest chunk.. which is probably what
9553                                  * is holding up the rwnd.
9554                                  */
9555                                 goto one_chunk_around;
9556                         }
9557                         return (1);
9558                 }
9559 one_chunk_around:
9560                 if (asoc->peers_rwnd < mtu) {
9561                         one_chunk = 1;
9562                         if ((asoc->peers_rwnd == 0) &&
9563                             (asoc->total_flight == 0)) {
9564                                 chk->window_probe = 1;
9565                                 chk->whoTo->window_probe = 1;
9566                         }
9567                 }
9568 #ifdef SCTP_AUDITING_ENABLED
9569                 sctp_audit_log(0xC3, 2);
9570 #endif
9571                 bundle_at = 0;
9572                 m = NULL;
9573                 net->fast_retran_ip = 0;
9574                 if (chk->rec.data.doing_fast_retransmit == 0) {
9575                         /*
9576                          * if no FR in progress skip destination that have
9577                          * flight_size > cwnd.
9578                          */
9579                         if (net->flight_size >= net->cwnd) {
9580                                 continue;
9581                         }
9582                 } else {
9583                         /*
9584                          * Mark the destination net to have FR recovery
9585                          * limits put on it.
9586                          */
9587                         *fr_done = 1;
9588                         net->fast_retran_ip = 1;
9589                 }
9590
9591                 /*
9592                  * if no AUTH is yet included and this chunk requires it,
9593                  * make sure to account for it.  We don't apply the size
9594                  * until the AUTH chunk is actually added below in case
9595                  * there is no room for this chunk.
9596                  */
9597                 if (data_auth_reqd && (auth == NULL)) {
9598                         dmtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
9599                 } else
9600                         dmtu = 0;
9601
9602                 if ((chk->send_size <= (mtu - dmtu)) ||
9603                     (chk->flags & CHUNK_FLAGS_FRAGMENT_OK)) {
9604                         /* ok we will add this one */
9605                         if (data_auth_reqd) {
9606                                 if (auth == NULL) {
9607                                         m = sctp_add_auth_chunk(m,
9608                                             &endofchain,
9609                                             &auth,
9610                                             &auth_offset,
9611                                             stcb,
9612                                             SCTP_DATA);
9613                                         auth_keyid = chk->auth_keyid;
9614                                         override_ok = 0;
9615                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
9616                                 } else if (override_ok) {
9617                                         auth_keyid = chk->auth_keyid;
9618                                         override_ok = 0;
9619                                 } else if (chk->auth_keyid != auth_keyid) {
9620                                         /* different keyid, so done bundling */
9621                                         break;
9622                                 }
9623                         }
9624                         m = sctp_copy_mbufchain(chk->data, m, &endofchain, 0, chk->send_size, chk->copy_by_ref);
9625                         if (m == NULL) {
9626                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
9627                                 return (ENOMEM);
9628                         }
9629                         /* Do clear IP_DF ? */
9630                         if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
9631                                 no_fragmentflg = 0;
9632                         }
9633                         /* update our MTU size */
9634                         if (mtu > (chk->send_size + dmtu))
9635                                 mtu -= (chk->send_size + dmtu);
9636                         else
9637                                 mtu = 0;
9638                         data_list[bundle_at++] = chk;
9639                         if (one_chunk && (asoc->total_flight <= 0)) {
9640                                 SCTP_STAT_INCR(sctps_windowprobed);
9641                         }
9642                 }
9643                 if (one_chunk == 0) {
9644                         /*
9645                          * now are there anymore forward from chk to pick
9646                          * up?
9647                          */
9648                         for (fwd = TAILQ_NEXT(chk, sctp_next); fwd != NULL; fwd = TAILQ_NEXT(fwd, sctp_next)) {
9649                                 if (fwd->sent != SCTP_DATAGRAM_RESEND) {
9650                                         /* Nope, not for retran */
9651                                         continue;
9652                                 }
9653                                 if (fwd->whoTo != net) {
9654                                         /* Nope, not the net in question */
9655                                         continue;
9656                                 }
9657                                 if (data_auth_reqd && (auth == NULL)) {
9658                                         dmtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
9659                                 } else
9660                                         dmtu = 0;
9661                                 if (fwd->send_size <= (mtu - dmtu)) {
9662                                         if (data_auth_reqd) {
9663                                                 if (auth == NULL) {
9664                                                         m = sctp_add_auth_chunk(m,
9665                                                             &endofchain,
9666                                                             &auth,
9667                                                             &auth_offset,
9668                                                             stcb,
9669                                                             SCTP_DATA);
9670                                                         auth_keyid = fwd->auth_keyid;
9671                                                         override_ok = 0;
9672                                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
9673                                                 } else if (override_ok) {
9674                                                         auth_keyid = fwd->auth_keyid;
9675                                                         override_ok = 0;
9676                                                 } else if (fwd->auth_keyid != auth_keyid) {
9677                                                         /*
9678                                                          * different keyid,
9679                                                          * so done bundling
9680                                                          */
9681                                                         break;
9682                                                 }
9683                                         }
9684                                         m = sctp_copy_mbufchain(fwd->data, m, &endofchain, 0, fwd->send_size, fwd->copy_by_ref);
9685                                         if (m == NULL) {
9686                                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
9687                                                 return (ENOMEM);
9688                                         }
9689                                         /* Do clear IP_DF ? */
9690                                         if (fwd->flags & CHUNK_FLAGS_FRAGMENT_OK) {
9691                                                 no_fragmentflg = 0;
9692                                         }
9693                                         /* update our MTU size */
9694                                         if (mtu > (fwd->send_size + dmtu))
9695                                                 mtu -= (fwd->send_size + dmtu);
9696                                         else
9697                                                 mtu = 0;
9698                                         data_list[bundle_at++] = fwd;
9699                                         if (bundle_at >= SCTP_MAX_DATA_BUNDLING) {
9700                                                 break;
9701                                         }
9702                                 } else {
9703                                         /* can't fit so we are done */
9704                                         break;
9705                                 }
9706                         }
9707                 }
9708                 /* Is there something to send for this destination? */
9709                 if (m) {
9710                         /*
9711                          * No matter if we fail/or succeed we should start a
9712                          * timer. A failure is like a lost IP packet :-)
9713                          */
9714                         if (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
9715                                 /*
9716                                  * no timer running on this destination
9717                                  * restart it.
9718                                  */
9719                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
9720                                 tmr_started = 1;
9721                         }
9722                         /* Now lets send it, if there is anything to send :> */
9723                         if ((error = sctp_lowlevel_chunk_output(inp, stcb, net,
9724                             (struct sockaddr *)&net->ro._l_addr, m,
9725                             auth_offset, auth, auth_keyid,
9726                             no_fragmentflg, 0, 0,
9727                             inp->sctp_lport, stcb->rport, htonl(stcb->asoc.peer_vtag),
9728                             net->port, NULL,
9729                             0, 0,
9730                             so_locked))) {
9731                                 /* error, we could not output */
9732                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
9733                                 if (error == ENOBUFS) {
9734                                         asoc->ifp_had_enobuf = 1;
9735                                         SCTP_STAT_INCR(sctps_lowlevelerr);
9736                                 }
9737                                 return (error);
9738                         } else {
9739                                 asoc->ifp_had_enobuf = 0;
9740                         }
9741                         endofchain = NULL;
9742                         auth = NULL;
9743                         auth_offset = 0;
9744                         /* For HB's */
9745                         /*
9746                          * We don't want to mark the net->sent time here
9747                          * since this we use this for HB and retrans cannot
9748                          * measure RTT
9749                          */
9750                         /* (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time); */
9751
9752                         /* For auto-close */
9753                         cnt_thru++;
9754                         if (*now_filled == 0) {
9755                                 (void)SCTP_GETTIME_TIMEVAL(&asoc->time_last_sent);
9756                                 *now = asoc->time_last_sent;
9757                                 *now_filled = 1;
9758                         } else {
9759                                 asoc->time_last_sent = *now;
9760                         }
9761                         *cnt_out += bundle_at;
9762 #ifdef SCTP_AUDITING_ENABLED
9763                         sctp_audit_log(0xC4, bundle_at);
9764 #endif
9765                         if (bundle_at) {
9766                                 tsns_sent = data_list[0]->rec.data.tsn;
9767                         }
9768                         for (i = 0; i < bundle_at; i++) {
9769                                 SCTP_STAT_INCR(sctps_sendretransdata);
9770                                 data_list[i]->sent = SCTP_DATAGRAM_SENT;
9771                                 /*
9772                                  * When we have a revoked data, and we
9773                                  * retransmit it, then we clear the revoked
9774                                  * flag since this flag dictates if we
9775                                  * subtracted from the fs
9776                                  */
9777                                 if (data_list[i]->rec.data.chunk_was_revoked) {
9778                                         /* Deflate the cwnd */
9779                                         data_list[i]->whoTo->cwnd -= data_list[i]->book_size;
9780                                         data_list[i]->rec.data.chunk_was_revoked = 0;
9781                                 }
9782                                 data_list[i]->snd_count++;
9783                                 sctp_ucount_decr(asoc->sent_queue_retran_cnt);
9784                                 /* record the time */
9785                                 data_list[i]->sent_rcv_time = asoc->time_last_sent;
9786                                 if (data_list[i]->book_size_scale) {
9787                                         /*
9788                                          * need to double the book size on
9789                                          * this one
9790                                          */
9791                                         data_list[i]->book_size_scale = 0;
9792                                         /*
9793                                          * Since we double the booksize, we
9794                                          * must also double the output queue
9795                                          * size, since this get shrunk when
9796                                          * we free by this amount.
9797                                          */
9798                                         atomic_add_int(&((asoc)->total_output_queue_size), data_list[i]->book_size);
9799                                         data_list[i]->book_size *= 2;
9800                                 } else {
9801                                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_RWND_ENABLE) {
9802                                                 sctp_log_rwnd(SCTP_DECREASE_PEER_RWND,
9803                                                     asoc->peers_rwnd, data_list[i]->send_size, SCTP_BASE_SYSCTL(sctp_peer_chunk_oh));
9804                                         }
9805                                         asoc->peers_rwnd = sctp_sbspace_sub(asoc->peers_rwnd,
9806                                             (uint32_t)(data_list[i]->send_size +
9807                                             SCTP_BASE_SYSCTL(sctp_peer_chunk_oh)));
9808                                 }
9809                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
9810                                         sctp_misc_ints(SCTP_FLIGHT_LOG_UP_RSND,
9811                                             data_list[i]->whoTo->flight_size,
9812                                             data_list[i]->book_size,
9813                                             (uint32_t)(uintptr_t)data_list[i]->whoTo,
9814                                             data_list[i]->rec.data.tsn);
9815                                 }
9816                                 sctp_flight_size_increase(data_list[i]);
9817                                 sctp_total_flight_increase(stcb, data_list[i]);
9818                                 if (asoc->peers_rwnd < stcb->sctp_ep->sctp_ep.sctp_sws_sender) {
9819                                         /* SWS sender side engages */
9820                                         asoc->peers_rwnd = 0;
9821                                 }
9822                                 if ((i == 0) &&
9823                                     (data_list[i]->rec.data.doing_fast_retransmit)) {
9824                                         SCTP_STAT_INCR(sctps_sendfastretrans);
9825                                         if ((data_list[i] == TAILQ_FIRST(&asoc->sent_queue)) &&
9826                                             (tmr_started == 0)) {
9827                                                 /*-
9828                                                  * ok we just fast-retrans'd
9829                                                  * the lowest TSN, i.e the
9830                                                  * first on the list. In
9831                                                  * this case we want to give
9832                                                  * some more time to get a
9833                                                  * SACK back without a
9834                                                  * t3-expiring.
9835                                                  */
9836                                                 sctp_timer_stop(SCTP_TIMER_TYPE_SEND, inp, stcb, net,
9837                                                     SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_2);
9838                                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
9839                                         }
9840                                 }
9841                         }
9842                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
9843                                 sctp_log_cwnd(stcb, net, tsns_sent, SCTP_CWND_LOG_FROM_RESEND);
9844                         }
9845 #ifdef SCTP_AUDITING_ENABLED
9846                         sctp_auditing(21, inp, stcb, NULL);
9847 #endif
9848                 } else {
9849                         /* None will fit */
9850                         return (1);
9851                 }
9852                 if (asoc->sent_queue_retran_cnt <= 0) {
9853                         /* all done we have no more to retran */
9854                         asoc->sent_queue_retran_cnt = 0;
9855                         break;
9856                 }
9857                 if (one_chunk) {
9858                         /* No more room in rwnd */
9859                         return (1);
9860                 }
9861                 /* stop the for loop here. we sent out a packet */
9862                 break;
9863         }
9864         return (0);
9865 }
9866
9867 static void
9868 sctp_timer_validation(struct sctp_inpcb *inp,
9869     struct sctp_tcb *stcb,
9870     struct sctp_association *asoc)
9871 {
9872         struct sctp_nets *net;
9873
9874         /* Validate that a timer is running somewhere */
9875         TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
9876                 if (SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
9877                         /* Here is a timer */
9878                         return;
9879                 }
9880         }
9881         SCTP_TCB_LOCK_ASSERT(stcb);
9882         /* Gak, we did not have a timer somewhere */
9883         SCTPDBG(SCTP_DEBUG_OUTPUT3, "Deadlock avoided starting timer on a dest at retran\n");
9884         if (asoc->alternate) {
9885                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, asoc->alternate);
9886         } else {
9887                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, asoc->primary_destination);
9888         }
9889         return;
9890 }
9891
9892 void
9893 sctp_chunk_output(struct sctp_inpcb *inp,
9894     struct sctp_tcb *stcb,
9895     int from_where,
9896     int so_locked)
9897 {
9898         /*-
9899          * Ok this is the generic chunk service queue. we must do the
9900          * following:
9901          * - See if there are retransmits pending, if so we must
9902          *   do these first.
9903          * - Service the stream queue that is next, moving any
9904          *   message (note I must get a complete message i.e.
9905          *   FIRST/MIDDLE and LAST to the out queue in one pass) and assigning
9906          *   TSN's
9907          * - Check to see if the cwnd/rwnd allows any output, if so we
9908          *   go ahead and formulate and send the low level chunks. Making sure
9909          *   to combine any control in the control chunk queue also.
9910          */
9911         struct sctp_association *asoc;
9912         struct sctp_nets *net;
9913         int error = 0, num_out, tot_out = 0, ret = 0, reason_code;
9914         unsigned int burst_cnt = 0;
9915         struct timeval now;
9916         int now_filled = 0;
9917         int nagle_on;
9918         uint32_t frag_point = sctp_get_frag_point(stcb);
9919         int un_sent = 0;
9920         int fr_done;
9921         unsigned int tot_frs = 0;
9922
9923         asoc = &stcb->asoc;
9924 do_it_again:
9925         /* The Nagle algorithm is only applied when handling a send call. */
9926         if (from_where == SCTP_OUTPUT_FROM_USR_SEND) {
9927                 if (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_NODELAY)) {
9928                         nagle_on = 0;
9929                 } else {
9930                         nagle_on = 1;
9931                 }
9932         } else {
9933                 nagle_on = 0;
9934         }
9935         SCTP_TCB_LOCK_ASSERT(stcb);
9936
9937         un_sent = (stcb->asoc.total_output_queue_size - stcb->asoc.total_flight);
9938
9939         if ((un_sent <= 0) &&
9940             (TAILQ_EMPTY(&asoc->control_send_queue)) &&
9941             (TAILQ_EMPTY(&asoc->asconf_send_queue)) &&
9942             (asoc->sent_queue_retran_cnt == 0) &&
9943             (asoc->trigger_reset == 0)) {
9944                 /* Nothing to do unless there is something to be sent left */
9945                 return;
9946         }
9947         /*
9948          * Do we have something to send, data or control AND a sack timer
9949          * running, if so piggy-back the sack.
9950          */
9951         if (SCTP_OS_TIMER_PENDING(&stcb->asoc.dack_timer.timer)) {
9952                 sctp_send_sack(stcb, so_locked);
9953                 sctp_timer_stop(SCTP_TIMER_TYPE_RECV, stcb->sctp_ep, stcb, NULL,
9954                     SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_3);
9955         }
9956         while (asoc->sent_queue_retran_cnt) {
9957                 /*-
9958                  * Ok, it is retransmission time only, we send out only ONE
9959                  * packet with a single call off to the retran code.
9960                  */
9961                 if (from_where == SCTP_OUTPUT_FROM_COOKIE_ACK) {
9962                         /*-
9963                          * Special hook for handling cookies discarded
9964                          * by peer that carried data. Send cookie-ack only
9965                          * and then the next call with get the retran's.
9966                          */
9967                         (void)sctp_med_chunk_output(inp, stcb, asoc, &num_out, &reason_code, 1,
9968                             from_where,
9969                             &now, &now_filled, frag_point, so_locked);
9970                         return;
9971                 } else if (from_where != SCTP_OUTPUT_FROM_HB_TMR) {
9972                         /* if its not from a HB then do it */
9973                         fr_done = 0;
9974                         ret = sctp_chunk_retransmission(inp, stcb, asoc, &num_out, &now, &now_filled, &fr_done, so_locked);
9975                         if (fr_done) {
9976                                 tot_frs++;
9977                         }
9978                 } else {
9979                         /*
9980                          * its from any other place, we don't allow retran
9981                          * output (only control)
9982                          */
9983                         ret = 1;
9984                 }
9985                 if (ret > 0) {
9986                         /* Can't send anymore */
9987                         /*-
9988                          * now lets push out control by calling med-level
9989                          * output once. this assures that we WILL send HB's
9990                          * if queued too.
9991                          */
9992                         (void)sctp_med_chunk_output(inp, stcb, asoc, &num_out, &reason_code, 1,
9993                             from_where,
9994                             &now, &now_filled, frag_point, so_locked);
9995 #ifdef SCTP_AUDITING_ENABLED
9996                         sctp_auditing(8, inp, stcb, NULL);
9997 #endif
9998                         sctp_timer_validation(inp, stcb, asoc);
9999                         return;
10000                 }
10001                 if (ret < 0) {
10002                         /*-
10003                          * The count was off.. retran is not happening so do
10004                          * the normal retransmission.
10005                          */
10006 #ifdef SCTP_AUDITING_ENABLED
10007                         sctp_auditing(9, inp, stcb, NULL);
10008 #endif
10009                         if (ret == SCTP_RETRAN_EXIT) {
10010                                 return;
10011                         }
10012                         break;
10013                 }
10014                 if (from_where == SCTP_OUTPUT_FROM_T3) {
10015                         /* Only one transmission allowed out of a timeout */
10016 #ifdef SCTP_AUDITING_ENABLED
10017                         sctp_auditing(10, inp, stcb, NULL);
10018 #endif
10019                         /* Push out any control */
10020                         (void)sctp_med_chunk_output(inp, stcb, asoc, &num_out, &reason_code, 1, from_where,
10021                             &now, &now_filled, frag_point, so_locked);
10022                         return;
10023                 }
10024                 if ((asoc->fr_max_burst > 0) && (tot_frs >= asoc->fr_max_burst)) {
10025                         /* Hit FR burst limit */
10026                         return;
10027                 }
10028                 if ((num_out == 0) && (ret == 0)) {
10029                         /* No more retrans to send */
10030                         break;
10031                 }
10032         }
10033 #ifdef SCTP_AUDITING_ENABLED
10034         sctp_auditing(12, inp, stcb, NULL);
10035 #endif
10036         /* Check for bad destinations, if they exist move chunks around. */
10037         TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
10038                 if (!(net->dest_state & SCTP_ADDR_REACHABLE)) {
10039                         /*-
10040                          * if possible move things off of this address we
10041                          * still may send below due to the dormant state but
10042                          * we try to find an alternate address to send to
10043                          * and if we have one we move all queued data on the
10044                          * out wheel to this alternate address.
10045                          */
10046                         if (net->ref_count > 1)
10047                                 sctp_move_chunks_from_net(stcb, net);
10048                 } else {
10049                         /*-
10050                          * if ((asoc->sat_network) || (net->addr_is_local))
10051                          * { burst_limit = asoc->max_burst *
10052                          * SCTP_SAT_NETWORK_BURST_INCR; }
10053                          */
10054                         if (asoc->max_burst > 0) {
10055                                 if (SCTP_BASE_SYSCTL(sctp_use_cwnd_based_maxburst)) {
10056                                         if ((net->flight_size + (asoc->max_burst * net->mtu)) < net->cwnd) {
10057                                                 /*
10058                                                  * JRS - Use the congestion
10059                                                  * control given in the
10060                                                  * congestion control module
10061                                                  */
10062                                                 asoc->cc_functions.sctp_cwnd_update_after_output(stcb, net, asoc->max_burst);
10063                                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_MAXBURST_ENABLE) {
10064                                                         sctp_log_maxburst(stcb, net, 0, asoc->max_burst, SCTP_MAX_BURST_APPLIED);
10065                                                 }
10066                                                 SCTP_STAT_INCR(sctps_maxburstqueued);
10067                                         }
10068                                         net->fast_retran_ip = 0;
10069                                 } else {
10070                                         if (net->flight_size == 0) {
10071                                                 /*
10072                                                  * Should be decaying the
10073                                                  * cwnd here
10074                                                  */
10075                                                 ;
10076                                         }
10077                                 }
10078                         }
10079                 }
10080         }
10081         burst_cnt = 0;
10082         do {
10083                 error = sctp_med_chunk_output(inp, stcb, asoc, &num_out,
10084                     &reason_code, 0, from_where,
10085                     &now, &now_filled, frag_point, so_locked);
10086                 if (error) {
10087                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Error %d was returned from med-c-op\n", error);
10088                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_MAXBURST_ENABLE) {
10089                                 sctp_log_maxburst(stcb, asoc->primary_destination, error, burst_cnt, SCTP_MAX_BURST_ERROR_STOP);
10090                         }
10091                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
10092                                 sctp_log_cwnd(stcb, NULL, error, SCTP_SEND_NOW_COMPLETES);
10093                                 sctp_log_cwnd(stcb, NULL, 0xdeadbeef, SCTP_SEND_NOW_COMPLETES);
10094                         }
10095                         break;
10096                 }
10097                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "m-c-o put out %d\n", num_out);
10098
10099                 tot_out += num_out;
10100                 burst_cnt++;
10101                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
10102                         sctp_log_cwnd(stcb, NULL, num_out, SCTP_SEND_NOW_COMPLETES);
10103                         if (num_out == 0) {
10104                                 sctp_log_cwnd(stcb, NULL, reason_code, SCTP_SEND_NOW_COMPLETES);
10105                         }
10106                 }
10107                 if (nagle_on) {
10108                         /*
10109                          * When the Nagle algorithm is used, look at how
10110                          * much is unsent, then if its smaller than an MTU
10111                          * and we have data in flight we stop, except if we
10112                          * are handling a fragmented user message.
10113                          */
10114                         un_sent = stcb->asoc.total_output_queue_size - stcb->asoc.total_flight;
10115                         if ((un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD)) &&
10116                             (stcb->asoc.total_flight > 0)) {
10117 /*      &&                   sctp_is_feature_on(inp, SCTP_PCB_FLAGS_EXPLICIT_EOR))) {*/
10118                                 break;
10119                         }
10120                 }
10121                 if (TAILQ_EMPTY(&asoc->control_send_queue) &&
10122                     TAILQ_EMPTY(&asoc->send_queue) &&
10123                     sctp_is_there_unsent_data(stcb, so_locked) == 0) {
10124                         /* Nothing left to send */
10125                         break;
10126                 }
10127                 if ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) <= 0) {
10128                         /* Nothing left to send */
10129                         break;
10130                 }
10131         } while (num_out &&
10132             ((asoc->max_burst == 0) ||
10133             SCTP_BASE_SYSCTL(sctp_use_cwnd_based_maxburst) ||
10134             (burst_cnt < asoc->max_burst)));
10135
10136         if (SCTP_BASE_SYSCTL(sctp_use_cwnd_based_maxburst) == 0) {
10137                 if ((asoc->max_burst > 0) && (burst_cnt >= asoc->max_burst)) {
10138                         SCTP_STAT_INCR(sctps_maxburstqueued);
10139                         asoc->burst_limit_applied = 1;
10140                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_MAXBURST_ENABLE) {
10141                                 sctp_log_maxburst(stcb, asoc->primary_destination, 0, burst_cnt, SCTP_MAX_BURST_APPLIED);
10142                         }
10143                 } else {
10144                         asoc->burst_limit_applied = 0;
10145                 }
10146         }
10147         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
10148                 sctp_log_cwnd(stcb, NULL, tot_out, SCTP_SEND_NOW_COMPLETES);
10149         }
10150         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Ok, we have put out %d chunks\n",
10151             tot_out);
10152
10153         /*-
10154          * Now we need to clean up the control chunk chain if a ECNE is on
10155          * it. It must be marked as UNSENT again so next call will continue
10156          * to send it until such time that we get a CWR, to remove it.
10157          */
10158         if (stcb->asoc.ecn_echo_cnt_onq)
10159                 sctp_fix_ecn_echo(asoc);
10160
10161         if (stcb->asoc.trigger_reset) {
10162                 if (sctp_send_stream_reset_out_if_possible(stcb, so_locked) == 0) {
10163                         goto do_it_again;
10164                 }
10165         }
10166         return;
10167 }
10168
10169 int
10170 sctp_output(
10171     struct sctp_inpcb *inp,
10172     struct mbuf *m,
10173     struct sockaddr *addr,
10174     struct mbuf *control,
10175     struct thread *p,
10176     int flags)
10177 {
10178         if (inp == NULL) {
10179                 SCTP_LTRACE_ERR_RET_PKT(m, inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
10180                 return (EINVAL);
10181         }
10182
10183         if (inp->sctp_socket == NULL) {
10184                 SCTP_LTRACE_ERR_RET_PKT(m, inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
10185                 return (EINVAL);
10186         }
10187         return (sctp_sosend(inp->sctp_socket,
10188             addr,
10189             (struct uio *)NULL,
10190             m,
10191             control,
10192             flags, p
10193             ));
10194 }
10195
10196 void
10197 send_forward_tsn(struct sctp_tcb *stcb,
10198     struct sctp_association *asoc)
10199 {
10200         struct sctp_tmit_chunk *chk, *at, *tp1, *last;
10201         struct sctp_forward_tsn_chunk *fwdtsn;
10202         struct sctp_strseq *strseq;
10203         struct sctp_strseq_mid *strseq_m;
10204         uint32_t advance_peer_ack_point;
10205         unsigned int cnt_of_space, i, ovh;
10206         unsigned int space_needed;
10207         unsigned int cnt_of_skipped = 0;
10208
10209         SCTP_TCB_LOCK_ASSERT(stcb);
10210         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
10211                 if (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN) {
10212                         /* mark it to unsent */
10213                         chk->sent = SCTP_DATAGRAM_UNSENT;
10214                         chk->snd_count = 0;
10215                         /* Do we correct its output location? */
10216                         if (chk->whoTo) {
10217                                 sctp_free_remote_addr(chk->whoTo);
10218                                 chk->whoTo = NULL;
10219                         }
10220                         goto sctp_fill_in_rest;
10221                 }
10222         }
10223         /* Ok if we reach here we must build one */
10224         sctp_alloc_a_chunk(stcb, chk);
10225         if (chk == NULL) {
10226                 return;
10227         }
10228         asoc->fwd_tsn_cnt++;
10229         chk->copy_by_ref = 0;
10230         /*
10231          * We don't do the old thing here since this is used not for on-wire
10232          * but to tell if we are sending a fwd-tsn by the stack during
10233          * output. And if its a IFORWARD or a FORWARD it is a fwd-tsn.
10234          */
10235         chk->rec.chunk_id.id = SCTP_FORWARD_CUM_TSN;
10236         chk->rec.chunk_id.can_take_data = 0;
10237         chk->flags = 0;
10238         chk->asoc = asoc;
10239         chk->whoTo = NULL;
10240         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
10241         if (chk->data == NULL) {
10242                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
10243                 return;
10244         }
10245         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
10246         chk->sent = SCTP_DATAGRAM_UNSENT;
10247         chk->snd_count = 0;
10248         TAILQ_INSERT_TAIL(&asoc->control_send_queue, chk, sctp_next);
10249         asoc->ctrl_queue_cnt++;
10250 sctp_fill_in_rest:
10251         /*-
10252          * Here we go through and fill out the part that deals with
10253          * stream/seq of the ones we skip.
10254          */
10255         SCTP_BUF_LEN(chk->data) = 0;
10256         TAILQ_FOREACH(at, &asoc->sent_queue, sctp_next) {
10257                 if ((at->sent != SCTP_FORWARD_TSN_SKIP) &&
10258                     (at->sent != SCTP_DATAGRAM_NR_ACKED)) {
10259                         /* no more to look at */
10260                         break;
10261                 }
10262                 if (!asoc->idata_supported && (at->rec.data.rcv_flags & SCTP_DATA_UNORDERED)) {
10263                         /* We don't report these */
10264                         continue;
10265                 }
10266                 cnt_of_skipped++;
10267         }
10268         if (asoc->idata_supported) {
10269                 space_needed = (sizeof(struct sctp_forward_tsn_chunk) +
10270                     (cnt_of_skipped * sizeof(struct sctp_strseq_mid)));
10271         } else {
10272                 space_needed = (sizeof(struct sctp_forward_tsn_chunk) +
10273                     (cnt_of_skipped * sizeof(struct sctp_strseq)));
10274         }
10275         cnt_of_space = (unsigned int)M_TRAILINGSPACE(chk->data);
10276
10277         if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
10278                 ovh = SCTP_MIN_OVERHEAD;
10279         } else {
10280                 ovh = SCTP_MIN_V4_OVERHEAD;
10281         }
10282         if (cnt_of_space > (asoc->smallest_mtu - ovh)) {
10283                 /* trim to a mtu size */
10284                 cnt_of_space = asoc->smallest_mtu - ovh;
10285         }
10286         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_TRY_ADVANCE) {
10287                 sctp_misc_ints(SCTP_FWD_TSN_CHECK,
10288                     0xff, 0, cnt_of_skipped,
10289                     asoc->advanced_peer_ack_point);
10290         }
10291         advance_peer_ack_point = asoc->advanced_peer_ack_point;
10292         if (cnt_of_space < space_needed) {
10293                 /*-
10294                  * ok we must trim down the chunk by lowering the
10295                  * advance peer ack point.
10296                  */
10297                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_TRY_ADVANCE) {
10298                         sctp_misc_ints(SCTP_FWD_TSN_CHECK,
10299                             0xff, 0xff, cnt_of_space,
10300                             space_needed);
10301                 }
10302                 cnt_of_skipped = cnt_of_space - sizeof(struct sctp_forward_tsn_chunk);
10303                 if (asoc->idata_supported) {
10304                         cnt_of_skipped /= sizeof(struct sctp_strseq_mid);
10305                 } else {
10306                         cnt_of_skipped /= sizeof(struct sctp_strseq);
10307                 }
10308                 /*-
10309                  * Go through and find the TSN that will be the one
10310                  * we report.
10311                  */
10312                 at = TAILQ_FIRST(&asoc->sent_queue);
10313                 if (at != NULL) {
10314                         for (i = 0; i < cnt_of_skipped; i++) {
10315                                 tp1 = TAILQ_NEXT(at, sctp_next);
10316                                 if (tp1 == NULL) {
10317                                         break;
10318                                 }
10319                                 at = tp1;
10320                         }
10321                 }
10322                 if (at && SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_TRY_ADVANCE) {
10323                         sctp_misc_ints(SCTP_FWD_TSN_CHECK,
10324                             0xff, cnt_of_skipped, at->rec.data.tsn,
10325                             asoc->advanced_peer_ack_point);
10326                 }
10327                 last = at;
10328                 /*-
10329                  * last now points to last one I can report, update
10330                  * peer ack point
10331                  */
10332                 if (last) {
10333                         advance_peer_ack_point = last->rec.data.tsn;
10334                 }
10335                 if (asoc->idata_supported) {
10336                         space_needed = sizeof(struct sctp_forward_tsn_chunk) +
10337                             cnt_of_skipped * sizeof(struct sctp_strseq_mid);
10338                 } else {
10339                         space_needed = sizeof(struct sctp_forward_tsn_chunk) +
10340                             cnt_of_skipped * sizeof(struct sctp_strseq);
10341                 }
10342         }
10343         chk->send_size = space_needed;
10344         /* Setup the chunk */
10345         fwdtsn = mtod(chk->data, struct sctp_forward_tsn_chunk *);
10346         fwdtsn->ch.chunk_length = htons(chk->send_size);
10347         fwdtsn->ch.chunk_flags = 0;
10348         if (asoc->idata_supported) {
10349                 fwdtsn->ch.chunk_type = SCTP_IFORWARD_CUM_TSN;
10350         } else {
10351                 fwdtsn->ch.chunk_type = SCTP_FORWARD_CUM_TSN;
10352         }
10353         fwdtsn->new_cumulative_tsn = htonl(advance_peer_ack_point);
10354         SCTP_BUF_LEN(chk->data) = chk->send_size;
10355         fwdtsn++;
10356         /*-
10357          * Move pointer to after the fwdtsn and transfer to the
10358          * strseq pointer.
10359          */
10360         if (asoc->idata_supported) {
10361                 strseq_m = (struct sctp_strseq_mid *)fwdtsn;
10362                 strseq = NULL;
10363         } else {
10364                 strseq = (struct sctp_strseq *)fwdtsn;
10365                 strseq_m = NULL;
10366         }
10367         /*-
10368          * Now populate the strseq list. This is done blindly
10369          * without pulling out duplicate stream info. This is
10370          * inefficient but won't harm the process since the peer will
10371          * look at these in sequence and will thus release anything.
10372          * It could mean we exceed the PMTU and chop off some that
10373          * we could have included.. but this is unlikely (aka 1432/4
10374          * would mean 300+ stream seq's would have to be reported in
10375          * one FWD-TSN. With a bit of work we can later FIX this to
10376          * optimize and pull out duplicates.. but it does add more
10377          * overhead. So for now... not!
10378          */
10379         i = 0;
10380         TAILQ_FOREACH(at, &asoc->sent_queue, sctp_next) {
10381                 if (i >= cnt_of_skipped) {
10382                         break;
10383                 }
10384                 if (!asoc->idata_supported && (at->rec.data.rcv_flags & SCTP_DATA_UNORDERED)) {
10385                         /* We don't report these */
10386                         continue;
10387                 }
10388                 if (at->rec.data.tsn == advance_peer_ack_point) {
10389                         at->rec.data.fwd_tsn_cnt = 0;
10390                 }
10391                 if (asoc->idata_supported) {
10392                         strseq_m->sid = htons(at->rec.data.sid);
10393                         if (at->rec.data.rcv_flags & SCTP_DATA_UNORDERED) {
10394                                 strseq_m->flags = htons(PR_SCTP_UNORDERED_FLAG);
10395                         } else {
10396                                 strseq_m->flags = 0;
10397                         }
10398                         strseq_m->mid = htonl(at->rec.data.mid);
10399                         strseq_m++;
10400                 } else {
10401                         strseq->sid = htons(at->rec.data.sid);
10402                         strseq->ssn = htons((uint16_t)at->rec.data.mid);
10403                         strseq++;
10404                 }
10405                 i++;
10406         }
10407         return;
10408 }
10409
10410 void
10411 sctp_send_sack(struct sctp_tcb *stcb, int so_locked)
10412 {
10413         /*-
10414          * Queue up a SACK or NR-SACK in the control queue.
10415          * We must first check to see if a SACK or NR-SACK is
10416          * somehow on the control queue.
10417          * If so, we will take and and remove the old one.
10418          */
10419         struct sctp_association *asoc;
10420         struct sctp_tmit_chunk *chk, *a_chk;
10421         struct sctp_sack_chunk *sack;
10422         struct sctp_nr_sack_chunk *nr_sack;
10423         struct sctp_gap_ack_block *gap_descriptor;
10424         const struct sack_track *selector;
10425         int mergeable = 0;
10426         int offset;
10427         caddr_t limit;
10428         uint32_t *dup;
10429         int limit_reached = 0;
10430         unsigned int i, siz, j;
10431         unsigned int num_gap_blocks = 0, num_nr_gap_blocks = 0, space;
10432         int num_dups = 0;
10433         int space_req;
10434         uint32_t highest_tsn;
10435         uint8_t flags;
10436         uint8_t type;
10437         uint8_t tsn_map;
10438
10439         if (stcb->asoc.nrsack_supported == 1) {
10440                 type = SCTP_NR_SELECTIVE_ACK;
10441         } else {
10442                 type = SCTP_SELECTIVE_ACK;
10443         }
10444         a_chk = NULL;
10445         asoc = &stcb->asoc;
10446         SCTP_TCB_LOCK_ASSERT(stcb);
10447         if (asoc->last_data_chunk_from == NULL) {
10448                 /* Hmm we never received anything */
10449                 return;
10450         }
10451         sctp_slide_mapping_arrays(stcb);
10452         sctp_set_rwnd(stcb, asoc);
10453         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
10454                 if (chk->rec.chunk_id.id == type) {
10455                         /* Hmm, found a sack already on queue, remove it */
10456                         TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
10457                         asoc->ctrl_queue_cnt--;
10458                         a_chk = chk;
10459                         if (a_chk->data) {
10460                                 sctp_m_freem(a_chk->data);
10461                                 a_chk->data = NULL;
10462                         }
10463                         if (a_chk->whoTo) {
10464                                 sctp_free_remote_addr(a_chk->whoTo);
10465                                 a_chk->whoTo = NULL;
10466                         }
10467                         break;
10468                 }
10469         }
10470         if (a_chk == NULL) {
10471                 sctp_alloc_a_chunk(stcb, a_chk);
10472                 if (a_chk == NULL) {
10473                         /* No memory so we drop the idea, and set a timer */
10474                         if (stcb->asoc.delayed_ack) {
10475                                 sctp_timer_stop(SCTP_TIMER_TYPE_RECV,
10476                                     stcb->sctp_ep, stcb, NULL,
10477                                     SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_4);
10478                                 sctp_timer_start(SCTP_TIMER_TYPE_RECV,
10479                                     stcb->sctp_ep, stcb, NULL);
10480                         } else {
10481                                 stcb->asoc.send_sack = 1;
10482                         }
10483                         return;
10484                 }
10485                 a_chk->copy_by_ref = 0;
10486                 a_chk->rec.chunk_id.id = type;
10487                 a_chk->rec.chunk_id.can_take_data = 1;
10488         }
10489         /* Clear our pkt counts */
10490         asoc->data_pkts_seen = 0;
10491
10492         a_chk->flags = 0;
10493         a_chk->asoc = asoc;
10494         a_chk->snd_count = 0;
10495         a_chk->send_size = 0;   /* fill in later */
10496         a_chk->sent = SCTP_DATAGRAM_UNSENT;
10497         a_chk->whoTo = NULL;
10498
10499         if (!(asoc->last_data_chunk_from->dest_state & SCTP_ADDR_REACHABLE)) {
10500                 /*-
10501                  * Ok, the destination for the SACK is unreachable, lets see if
10502                  * we can select an alternate to asoc->last_data_chunk_from
10503                  */
10504                 a_chk->whoTo = sctp_find_alternate_net(stcb, asoc->last_data_chunk_from, 0);
10505                 if (a_chk->whoTo == NULL) {
10506                         /* Nope, no alternate */
10507                         a_chk->whoTo = asoc->last_data_chunk_from;
10508                 }
10509         } else {
10510                 a_chk->whoTo = asoc->last_data_chunk_from;
10511         }
10512         if (a_chk->whoTo) {
10513                 atomic_add_int(&a_chk->whoTo->ref_count, 1);
10514         }
10515         if (SCTP_TSN_GT(asoc->highest_tsn_inside_map, asoc->highest_tsn_inside_nr_map)) {
10516                 highest_tsn = asoc->highest_tsn_inside_map;
10517         } else {
10518                 highest_tsn = asoc->highest_tsn_inside_nr_map;
10519         }
10520         if (highest_tsn == asoc->cumulative_tsn) {
10521                 /* no gaps */
10522                 if (type == SCTP_SELECTIVE_ACK) {
10523                         space_req = sizeof(struct sctp_sack_chunk);
10524                 } else {
10525                         space_req = sizeof(struct sctp_nr_sack_chunk);
10526                 }
10527         } else {
10528                 /* gaps get a cluster */
10529                 space_req = MCLBYTES;
10530         }
10531         /* Ok now lets formulate a MBUF with our sack */
10532         a_chk->data = sctp_get_mbuf_for_msg(space_req, 0, M_NOWAIT, 1, MT_DATA);
10533         if ((a_chk->data == NULL) ||
10534             (a_chk->whoTo == NULL)) {
10535                 /* rats, no mbuf memory */
10536                 if (a_chk->data) {
10537                         /* was a problem with the destination */
10538                         sctp_m_freem(a_chk->data);
10539                         a_chk->data = NULL;
10540                 }
10541                 sctp_free_a_chunk(stcb, a_chk, so_locked);
10542                 /* sa_ignore NO_NULL_CHK */
10543                 if (stcb->asoc.delayed_ack) {
10544                         sctp_timer_stop(SCTP_TIMER_TYPE_RECV,
10545                             stcb->sctp_ep, stcb, NULL,
10546                             SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_5);
10547                         sctp_timer_start(SCTP_TIMER_TYPE_RECV,
10548                             stcb->sctp_ep, stcb, NULL);
10549                 } else {
10550                         stcb->asoc.send_sack = 1;
10551                 }
10552                 return;
10553         }
10554         /* ok, lets go through and fill it in */
10555         SCTP_BUF_RESV_UF(a_chk->data, SCTP_MIN_OVERHEAD);
10556         space = (unsigned int)M_TRAILINGSPACE(a_chk->data);
10557         if (space > (a_chk->whoTo->mtu - SCTP_MIN_OVERHEAD)) {
10558                 space = (a_chk->whoTo->mtu - SCTP_MIN_OVERHEAD);
10559         }
10560         limit = mtod(a_chk->data, caddr_t);
10561         limit += space;
10562
10563         flags = 0;
10564
10565         if ((asoc->sctp_cmt_on_off > 0) &&
10566             SCTP_BASE_SYSCTL(sctp_cmt_use_dac)) {
10567                 /*-
10568                  * CMT DAC algorithm: If 2 (i.e., 0x10) packets have been
10569                  * received, then set high bit to 1, else 0. Reset
10570                  * pkts_rcvd.
10571                  */
10572                 flags |= (asoc->cmt_dac_pkts_rcvd << 6);
10573                 asoc->cmt_dac_pkts_rcvd = 0;
10574         }
10575 #ifdef SCTP_ASOCLOG_OF_TSNS
10576         stcb->asoc.cumack_logsnt[stcb->asoc.cumack_log_atsnt] = asoc->cumulative_tsn;
10577         stcb->asoc.cumack_log_atsnt++;
10578         if (stcb->asoc.cumack_log_atsnt >= SCTP_TSN_LOG_SIZE) {
10579                 stcb->asoc.cumack_log_atsnt = 0;
10580         }
10581 #endif
10582         /* reset the readers interpretation */
10583         stcb->freed_by_sorcv_sincelast = 0;
10584
10585         if (type == SCTP_SELECTIVE_ACK) {
10586                 sack = mtod(a_chk->data, struct sctp_sack_chunk *);
10587                 nr_sack = NULL;
10588                 gap_descriptor = (struct sctp_gap_ack_block *)((caddr_t)sack + sizeof(struct sctp_sack_chunk));
10589                 if (highest_tsn > asoc->mapping_array_base_tsn) {
10590                         siz = (((highest_tsn - asoc->mapping_array_base_tsn) + 1) + 7) / 8;
10591                 } else {
10592                         siz = (((MAX_TSN - asoc->mapping_array_base_tsn) + 1) + highest_tsn + 7) / 8;
10593                 }
10594         } else {
10595                 sack = NULL;
10596                 nr_sack = mtod(a_chk->data, struct sctp_nr_sack_chunk *);
10597                 gap_descriptor = (struct sctp_gap_ack_block *)((caddr_t)nr_sack + sizeof(struct sctp_nr_sack_chunk));
10598                 if (asoc->highest_tsn_inside_map > asoc->mapping_array_base_tsn) {
10599                         siz = (((asoc->highest_tsn_inside_map - asoc->mapping_array_base_tsn) + 1) + 7) / 8;
10600                 } else {
10601                         siz = (((MAX_TSN - asoc->mapping_array_base_tsn) + 1) + asoc->highest_tsn_inside_map + 7) / 8;
10602                 }
10603         }
10604
10605         if (SCTP_TSN_GT(asoc->mapping_array_base_tsn, asoc->cumulative_tsn)) {
10606                 offset = 1;
10607         } else {
10608                 offset = asoc->mapping_array_base_tsn - asoc->cumulative_tsn;
10609         }
10610         if (((type == SCTP_SELECTIVE_ACK) &&
10611             SCTP_TSN_GT(highest_tsn, asoc->cumulative_tsn)) ||
10612             ((type == SCTP_NR_SELECTIVE_ACK) &&
10613             SCTP_TSN_GT(asoc->highest_tsn_inside_map, asoc->cumulative_tsn))) {
10614                 /* we have a gap .. maybe */
10615                 for (i = 0; i < siz; i++) {
10616                         tsn_map = asoc->mapping_array[i];
10617                         if (type == SCTP_SELECTIVE_ACK) {
10618                                 tsn_map |= asoc->nr_mapping_array[i];
10619                         }
10620                         if (i == 0) {
10621                                 /*
10622                                  * Clear all bits corresponding to TSNs
10623                                  * smaller or equal to the cumulative TSN.
10624                                  */
10625                                 tsn_map &= (~0U << (1 - offset));
10626                         }
10627                         selector = &sack_array[tsn_map];
10628                         if (mergeable && selector->right_edge) {
10629                                 /*
10630                                  * Backup, left and right edges were ok to
10631                                  * merge.
10632                                  */
10633                                 num_gap_blocks--;
10634                                 gap_descriptor--;
10635                         }
10636                         if (selector->num_entries == 0)
10637                                 mergeable = 0;
10638                         else {
10639                                 for (j = 0; j < selector->num_entries; j++) {
10640                                         if (mergeable && selector->right_edge) {
10641                                                 /*
10642                                                  * do a merge by NOT setting
10643                                                  * the left side
10644                                                  */
10645                                                 mergeable = 0;
10646                                         } else {
10647                                                 /*
10648                                                  * no merge, set the left
10649                                                  * side
10650                                                  */
10651                                                 mergeable = 0;
10652                                                 gap_descriptor->start = htons((selector->gaps[j].start + offset));
10653                                         }
10654                                         gap_descriptor->end = htons((selector->gaps[j].end + offset));
10655                                         num_gap_blocks++;
10656                                         gap_descriptor++;
10657                                         if (((caddr_t)gap_descriptor + sizeof(struct sctp_gap_ack_block)) > limit) {
10658                                                 /* no more room */
10659                                                 limit_reached = 1;
10660                                                 break;
10661                                         }
10662                                 }
10663                                 if (selector->left_edge) {
10664                                         mergeable = 1;
10665                                 }
10666                         }
10667                         if (limit_reached) {
10668                                 /* Reached the limit stop */
10669                                 break;
10670                         }
10671                         offset += 8;
10672                 }
10673         }
10674         if ((type == SCTP_NR_SELECTIVE_ACK) &&
10675             (limit_reached == 0)) {
10676                 mergeable = 0;
10677
10678                 if (asoc->highest_tsn_inside_nr_map > asoc->mapping_array_base_tsn) {
10679                         siz = (((asoc->highest_tsn_inside_nr_map - asoc->mapping_array_base_tsn) + 1) + 7) / 8;
10680                 } else {
10681                         siz = (((MAX_TSN - asoc->mapping_array_base_tsn) + 1) + asoc->highest_tsn_inside_nr_map + 7) / 8;
10682                 }
10683
10684                 if (SCTP_TSN_GT(asoc->mapping_array_base_tsn, asoc->cumulative_tsn)) {
10685                         offset = 1;
10686                 } else {
10687                         offset = asoc->mapping_array_base_tsn - asoc->cumulative_tsn;
10688                 }
10689                 if (SCTP_TSN_GT(asoc->highest_tsn_inside_nr_map, asoc->cumulative_tsn)) {
10690                         /* we have a gap .. maybe */
10691                         for (i = 0; i < siz; i++) {
10692                                 tsn_map = asoc->nr_mapping_array[i];
10693                                 if (i == 0) {
10694                                         /*
10695                                          * Clear all bits corresponding to
10696                                          * TSNs smaller or equal to the
10697                                          * cumulative TSN.
10698                                          */
10699                                         tsn_map &= (~0U << (1 - offset));
10700                                 }
10701                                 selector = &sack_array[tsn_map];
10702                                 if (mergeable && selector->right_edge) {
10703                                         /*
10704                                          * Backup, left and right edges were
10705                                          * ok to merge.
10706                                          */
10707                                         num_nr_gap_blocks--;
10708                                         gap_descriptor--;
10709                                 }
10710                                 if (selector->num_entries == 0)
10711                                         mergeable = 0;
10712                                 else {
10713                                         for (j = 0; j < selector->num_entries; j++) {
10714                                                 if (mergeable && selector->right_edge) {
10715                                                         /*
10716                                                          * do a merge by NOT
10717                                                          * setting the left
10718                                                          * side
10719                                                          */
10720                                                         mergeable = 0;
10721                                                 } else {
10722                                                         /*
10723                                                          * no merge, set the
10724                                                          * left side
10725                                                          */
10726                                                         mergeable = 0;
10727                                                         gap_descriptor->start = htons((selector->gaps[j].start + offset));
10728                                                 }
10729                                                 gap_descriptor->end = htons((selector->gaps[j].end + offset));
10730                                                 num_nr_gap_blocks++;
10731                                                 gap_descriptor++;
10732                                                 if (((caddr_t)gap_descriptor + sizeof(struct sctp_gap_ack_block)) > limit) {
10733                                                         /* no more room */
10734                                                         limit_reached = 1;
10735                                                         break;
10736                                                 }
10737                                         }
10738                                         if (selector->left_edge) {
10739                                                 mergeable = 1;
10740                                         }
10741                                 }
10742                                 if (limit_reached) {
10743                                         /* Reached the limit stop */
10744                                         break;
10745                                 }
10746                                 offset += 8;
10747                         }
10748                 }
10749         }
10750         /* now we must add any dups we are going to report. */
10751         if ((limit_reached == 0) && (asoc->numduptsns)) {
10752                 dup = (uint32_t *)gap_descriptor;
10753                 for (i = 0; i < asoc->numduptsns; i++) {
10754                         *dup = htonl(asoc->dup_tsns[i]);
10755                         dup++;
10756                         num_dups++;
10757                         if (((caddr_t)dup + sizeof(uint32_t)) > limit) {
10758                                 /* no more room */
10759                                 break;
10760                         }
10761                 }
10762                 asoc->numduptsns = 0;
10763         }
10764         /*
10765          * now that the chunk is prepared queue it to the control chunk
10766          * queue.
10767          */
10768         if (type == SCTP_SELECTIVE_ACK) {
10769                 a_chk->send_size = (uint16_t)(sizeof(struct sctp_sack_chunk) +
10770                     (num_gap_blocks + num_nr_gap_blocks) * sizeof(struct sctp_gap_ack_block) +
10771                     num_dups * sizeof(int32_t));
10772                 SCTP_BUF_LEN(a_chk->data) = a_chk->send_size;
10773                 sack->sack.cum_tsn_ack = htonl(asoc->cumulative_tsn);
10774                 sack->sack.a_rwnd = htonl(asoc->my_rwnd);
10775                 sack->sack.num_gap_ack_blks = htons(num_gap_blocks);
10776                 sack->sack.num_dup_tsns = htons(num_dups);
10777                 sack->ch.chunk_type = type;
10778                 sack->ch.chunk_flags = flags;
10779                 sack->ch.chunk_length = htons(a_chk->send_size);
10780         } else {
10781                 a_chk->send_size = (uint16_t)(sizeof(struct sctp_nr_sack_chunk) +
10782                     (num_gap_blocks + num_nr_gap_blocks) * sizeof(struct sctp_gap_ack_block) +
10783                     num_dups * sizeof(int32_t));
10784                 SCTP_BUF_LEN(a_chk->data) = a_chk->send_size;
10785                 nr_sack->nr_sack.cum_tsn_ack = htonl(asoc->cumulative_tsn);
10786                 nr_sack->nr_sack.a_rwnd = htonl(asoc->my_rwnd);
10787                 nr_sack->nr_sack.num_gap_ack_blks = htons(num_gap_blocks);
10788                 nr_sack->nr_sack.num_nr_gap_ack_blks = htons(num_nr_gap_blocks);
10789                 nr_sack->nr_sack.num_dup_tsns = htons(num_dups);
10790                 nr_sack->nr_sack.reserved = 0;
10791                 nr_sack->ch.chunk_type = type;
10792                 nr_sack->ch.chunk_flags = flags;
10793                 nr_sack->ch.chunk_length = htons(a_chk->send_size);
10794         }
10795         TAILQ_INSERT_TAIL(&asoc->control_send_queue, a_chk, sctp_next);
10796         asoc->my_last_reported_rwnd = asoc->my_rwnd;
10797         asoc->ctrl_queue_cnt++;
10798         asoc->send_sack = 0;
10799         SCTP_STAT_INCR(sctps_sendsacks);
10800         return;
10801 }
10802
10803 void
10804 sctp_send_abort_tcb(struct sctp_tcb *stcb, struct mbuf *operr, int so_locked)
10805 {
10806         struct mbuf *m_abort, *m, *m_last;
10807         struct mbuf *m_out, *m_end = NULL;
10808         struct sctp_abort_chunk *abort;
10809         struct sctp_auth_chunk *auth = NULL;
10810         struct sctp_nets *net;
10811         uint32_t vtag;
10812         uint32_t auth_offset = 0;
10813         int error;
10814         uint16_t cause_len, chunk_len, padding_len;
10815
10816         SCTP_TCB_LOCK_ASSERT(stcb);
10817         /*-
10818          * Add an AUTH chunk, if chunk requires it and save the offset into
10819          * the chain for AUTH
10820          */
10821         if (sctp_auth_is_required_chunk(SCTP_ABORT_ASSOCIATION,
10822             stcb->asoc.peer_auth_chunks)) {
10823                 m_out = sctp_add_auth_chunk(NULL, &m_end, &auth, &auth_offset,
10824                     stcb, SCTP_ABORT_ASSOCIATION);
10825                 SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
10826         } else {
10827                 m_out = NULL;
10828         }
10829         m_abort = sctp_get_mbuf_for_msg(sizeof(struct sctp_abort_chunk), 0, M_NOWAIT, 1, MT_HEADER);
10830         if (m_abort == NULL) {
10831                 if (m_out) {
10832                         sctp_m_freem(m_out);
10833                 }
10834                 if (operr) {
10835                         sctp_m_freem(operr);
10836                 }
10837                 return;
10838         }
10839         /* link in any error */
10840         SCTP_BUF_NEXT(m_abort) = operr;
10841         cause_len = 0;
10842         m_last = NULL;
10843         for (m = operr; m; m = SCTP_BUF_NEXT(m)) {
10844                 cause_len += (uint16_t)SCTP_BUF_LEN(m);
10845                 if (SCTP_BUF_NEXT(m) == NULL) {
10846                         m_last = m;
10847                 }
10848         }
10849         SCTP_BUF_LEN(m_abort) = sizeof(struct sctp_abort_chunk);
10850         chunk_len = (uint16_t)sizeof(struct sctp_abort_chunk) + cause_len;
10851         padding_len = SCTP_SIZE32(chunk_len) - chunk_len;
10852         if (m_out == NULL) {
10853                 /* NO Auth chunk prepended, so reserve space in front */
10854                 SCTP_BUF_RESV_UF(m_abort, SCTP_MIN_OVERHEAD);
10855                 m_out = m_abort;
10856         } else {
10857                 /* Put AUTH chunk at the front of the chain */
10858                 SCTP_BUF_NEXT(m_end) = m_abort;
10859         }
10860         if (stcb->asoc.alternate) {
10861                 net = stcb->asoc.alternate;
10862         } else {
10863                 net = stcb->asoc.primary_destination;
10864         }
10865         /* Fill in the ABORT chunk header. */
10866         abort = mtod(m_abort, struct sctp_abort_chunk *);
10867         abort->ch.chunk_type = SCTP_ABORT_ASSOCIATION;
10868         if (stcb->asoc.peer_vtag == 0) {
10869                 /* This happens iff the assoc is in COOKIE-WAIT state. */
10870                 vtag = stcb->asoc.my_vtag;
10871                 abort->ch.chunk_flags = SCTP_HAD_NO_TCB;
10872         } else {
10873                 vtag = stcb->asoc.peer_vtag;
10874                 abort->ch.chunk_flags = 0;
10875         }
10876         abort->ch.chunk_length = htons(chunk_len);
10877         /* Add padding, if necessary. */
10878         if (padding_len > 0) {
10879                 if ((m_last == NULL) ||
10880                     (sctp_add_pad_tombuf(m_last, padding_len) == NULL)) {
10881                         sctp_m_freem(m_out);
10882                         return;
10883                 }
10884         }
10885         if ((error = sctp_lowlevel_chunk_output(stcb->sctp_ep, stcb, net,
10886             (struct sockaddr *)&net->ro._l_addr,
10887             m_out, auth_offset, auth, stcb->asoc.authinfo.active_keyid, 1, 0, 0,
10888             stcb->sctp_ep->sctp_lport, stcb->rport, htonl(vtag),
10889             stcb->asoc.primary_destination->port, NULL,
10890             0, 0,
10891             so_locked))) {
10892                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
10893                 if (error == ENOBUFS) {
10894                         stcb->asoc.ifp_had_enobuf = 1;
10895                         SCTP_STAT_INCR(sctps_lowlevelerr);
10896                 }
10897         } else {
10898                 stcb->asoc.ifp_had_enobuf = 0;
10899         }
10900         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
10901 }
10902
10903 void
10904 sctp_send_shutdown_complete(struct sctp_tcb *stcb,
10905     struct sctp_nets *net,
10906     int reflect_vtag)
10907 {
10908         /* formulate and SEND a SHUTDOWN-COMPLETE */
10909         struct mbuf *m_shutdown_comp;
10910         struct sctp_shutdown_complete_chunk *shutdown_complete;
10911         uint32_t vtag;
10912         int error;
10913         uint8_t flags;
10914
10915         m_shutdown_comp = sctp_get_mbuf_for_msg(sizeof(struct sctp_chunkhdr), 0, M_NOWAIT, 1, MT_HEADER);
10916         if (m_shutdown_comp == NULL) {
10917                 /* no mbuf's */
10918                 return;
10919         }
10920         if (reflect_vtag) {
10921                 flags = SCTP_HAD_NO_TCB;
10922                 vtag = stcb->asoc.my_vtag;
10923         } else {
10924                 flags = 0;
10925                 vtag = stcb->asoc.peer_vtag;
10926         }
10927         shutdown_complete = mtod(m_shutdown_comp, struct sctp_shutdown_complete_chunk *);
10928         shutdown_complete->ch.chunk_type = SCTP_SHUTDOWN_COMPLETE;
10929         shutdown_complete->ch.chunk_flags = flags;
10930         shutdown_complete->ch.chunk_length = htons(sizeof(struct sctp_shutdown_complete_chunk));
10931         SCTP_BUF_LEN(m_shutdown_comp) = sizeof(struct sctp_shutdown_complete_chunk);
10932         if ((error = sctp_lowlevel_chunk_output(stcb->sctp_ep, stcb, net,
10933             (struct sockaddr *)&net->ro._l_addr,
10934             m_shutdown_comp, 0, NULL, 0, 1, 0, 0,
10935             stcb->sctp_ep->sctp_lport, stcb->rport,
10936             htonl(vtag),
10937             net->port, NULL,
10938             0, 0,
10939             SCTP_SO_NOT_LOCKED))) {
10940                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
10941                 if (error == ENOBUFS) {
10942                         stcb->asoc.ifp_had_enobuf = 1;
10943                         SCTP_STAT_INCR(sctps_lowlevelerr);
10944                 }
10945         } else {
10946                 stcb->asoc.ifp_had_enobuf = 0;
10947         }
10948         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
10949         return;
10950 }
10951
10952 static void
10953 sctp_send_resp_msg(struct sockaddr *src, struct sockaddr *dst,
10954     struct sctphdr *sh, uint32_t vtag,
10955     uint8_t type, struct mbuf *cause,
10956     uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum,
10957     uint32_t vrf_id, uint16_t port)
10958 {
10959         struct mbuf *o_pak;
10960         struct mbuf *mout;
10961         struct sctphdr *shout;
10962         struct sctp_chunkhdr *ch;
10963 #if defined(INET) || defined(INET6)
10964         struct udphdr *udp;
10965 #endif
10966         int ret, len, cause_len, padding_len;
10967 #ifdef INET
10968         struct sockaddr_in *src_sin, *dst_sin;
10969         struct ip *ip;
10970 #endif
10971 #ifdef INET6
10972         struct sockaddr_in6 *src_sin6, *dst_sin6;
10973         struct ip6_hdr *ip6;
10974 #endif
10975
10976         /* Compute the length of the cause and add final padding. */
10977         cause_len = 0;
10978         if (cause != NULL) {
10979                 struct mbuf *m_at, *m_last = NULL;
10980
10981                 for (m_at = cause; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
10982                         if (SCTP_BUF_NEXT(m_at) == NULL)
10983                                 m_last = m_at;
10984                         cause_len += SCTP_BUF_LEN(m_at);
10985                 }
10986                 padding_len = cause_len % 4;
10987                 if (padding_len != 0) {
10988                         padding_len = 4 - padding_len;
10989                 }
10990                 if (padding_len != 0) {
10991                         if (sctp_add_pad_tombuf(m_last, padding_len) == NULL) {
10992                                 sctp_m_freem(cause);
10993                                 return;
10994                         }
10995                 }
10996         } else {
10997                 padding_len = 0;
10998         }
10999         /* Get an mbuf for the header. */
11000         len = sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
11001         switch (dst->sa_family) {
11002 #ifdef INET
11003         case AF_INET:
11004                 len += sizeof(struct ip);
11005                 break;
11006 #endif
11007 #ifdef INET6
11008         case AF_INET6:
11009                 len += sizeof(struct ip6_hdr);
11010                 break;
11011 #endif
11012         default:
11013                 break;
11014         }
11015 #if defined(INET) || defined(INET6)
11016         if (port) {
11017                 len += sizeof(struct udphdr);
11018         }
11019 #endif
11020         mout = sctp_get_mbuf_for_msg(len + max_linkhdr, 1, M_NOWAIT, 1, MT_DATA);
11021         if (mout == NULL) {
11022                 if (cause) {
11023                         sctp_m_freem(cause);
11024                 }
11025                 return;
11026         }
11027         SCTP_BUF_RESV_UF(mout, max_linkhdr);
11028         SCTP_BUF_LEN(mout) = len;
11029         SCTP_BUF_NEXT(mout) = cause;
11030         M_SETFIB(mout, fibnum);
11031         mout->m_pkthdr.flowid = mflowid;
11032         M_HASHTYPE_SET(mout, mflowtype);
11033 #ifdef INET
11034         ip = NULL;
11035 #endif
11036 #ifdef INET6
11037         ip6 = NULL;
11038 #endif
11039         switch (dst->sa_family) {
11040 #ifdef INET
11041         case AF_INET:
11042                 src_sin = (struct sockaddr_in *)src;
11043                 dst_sin = (struct sockaddr_in *)dst;
11044                 ip = mtod(mout, struct ip *);
11045                 ip->ip_v = IPVERSION;
11046                 ip->ip_hl = (sizeof(struct ip) >> 2);
11047                 ip->ip_tos = 0;
11048                 ip->ip_off = htons(IP_DF);
11049                 ip_fillid(ip);
11050                 ip->ip_ttl = MODULE_GLOBAL(ip_defttl);
11051                 if (port) {
11052                         ip->ip_p = IPPROTO_UDP;
11053                 } else {
11054                         ip->ip_p = IPPROTO_SCTP;
11055                 }
11056                 ip->ip_src.s_addr = dst_sin->sin_addr.s_addr;
11057                 ip->ip_dst.s_addr = src_sin->sin_addr.s_addr;
11058                 ip->ip_sum = 0;
11059                 len = sizeof(struct ip);
11060                 shout = (struct sctphdr *)((caddr_t)ip + len);
11061                 break;
11062 #endif
11063 #ifdef INET6
11064         case AF_INET6:
11065                 src_sin6 = (struct sockaddr_in6 *)src;
11066                 dst_sin6 = (struct sockaddr_in6 *)dst;
11067                 ip6 = mtod(mout, struct ip6_hdr *);
11068                 ip6->ip6_flow = htonl(0x60000000);
11069                 if (V_ip6_auto_flowlabel) {
11070                         ip6->ip6_flow |= (htonl(ip6_randomflowlabel()) & IPV6_FLOWLABEL_MASK);
11071                 }
11072                 ip6->ip6_hlim = MODULE_GLOBAL(ip6_defhlim);
11073                 if (port) {
11074                         ip6->ip6_nxt = IPPROTO_UDP;
11075                 } else {
11076                         ip6->ip6_nxt = IPPROTO_SCTP;
11077                 }
11078                 ip6->ip6_src = dst_sin6->sin6_addr;
11079                 ip6->ip6_dst = src_sin6->sin6_addr;
11080                 len = sizeof(struct ip6_hdr);
11081                 shout = (struct sctphdr *)((caddr_t)ip6 + len);
11082                 break;
11083 #endif
11084         default:
11085                 len = 0;
11086                 shout = mtod(mout, struct sctphdr *);
11087                 break;
11088         }
11089 #if defined(INET) || defined(INET6)
11090         if (port) {
11091                 if (htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port)) == 0) {
11092                         sctp_m_freem(mout);
11093                         return;
11094                 }
11095                 udp = (struct udphdr *)shout;
11096                 udp->uh_sport = htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port));
11097                 udp->uh_dport = port;
11098                 udp->uh_sum = 0;
11099                 udp->uh_ulen = htons((uint16_t)(sizeof(struct udphdr) +
11100                     sizeof(struct sctphdr) +
11101                     sizeof(struct sctp_chunkhdr) +
11102                     cause_len + padding_len));
11103                 len += sizeof(struct udphdr);
11104                 shout = (struct sctphdr *)((caddr_t)shout + sizeof(struct udphdr));
11105         } else {
11106                 udp = NULL;
11107         }
11108 #endif
11109         shout->src_port = sh->dest_port;
11110         shout->dest_port = sh->src_port;
11111         shout->checksum = 0;
11112         if (vtag) {
11113                 shout->v_tag = htonl(vtag);
11114         } else {
11115                 shout->v_tag = sh->v_tag;
11116         }
11117         len += sizeof(struct sctphdr);
11118         ch = (struct sctp_chunkhdr *)((caddr_t)shout + sizeof(struct sctphdr));
11119         ch->chunk_type = type;
11120         if (vtag) {
11121                 ch->chunk_flags = 0;
11122         } else {
11123                 ch->chunk_flags = SCTP_HAD_NO_TCB;
11124         }
11125         ch->chunk_length = htons((uint16_t)(sizeof(struct sctp_chunkhdr) + cause_len));
11126         len += sizeof(struct sctp_chunkhdr);
11127         len += cause_len + padding_len;
11128
11129         if (SCTP_GET_HEADER_FOR_OUTPUT(o_pak)) {
11130                 sctp_m_freem(mout);
11131                 return;
11132         }
11133         SCTP_ATTACH_CHAIN(o_pak, mout, len);
11134         switch (dst->sa_family) {
11135 #ifdef INET
11136         case AF_INET:
11137                 if (port) {
11138                         if (V_udp_cksum) {
11139                                 udp->uh_sum = in_pseudo(ip->ip_src.s_addr, ip->ip_dst.s_addr, udp->uh_ulen + htons(IPPROTO_UDP));
11140                         } else {
11141                                 udp->uh_sum = 0;
11142                         }
11143                 }
11144                 ip->ip_len = htons(len);
11145                 if (port) {
11146                         shout->checksum = sctp_calculate_cksum(mout, sizeof(struct ip) + sizeof(struct udphdr));
11147                         SCTP_STAT_INCR(sctps_sendswcrc);
11148                         if (V_udp_cksum) {
11149                                 SCTP_ENABLE_UDP_CSUM(o_pak);
11150                         }
11151                 } else {
11152                         mout->m_pkthdr.csum_flags = CSUM_SCTP;
11153                         mout->m_pkthdr.csum_data = offsetof(struct sctphdr, checksum);
11154                         SCTP_STAT_INCR(sctps_sendhwcrc);
11155                 }
11156 #ifdef SCTP_PACKET_LOGGING
11157                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING) {
11158                         sctp_packet_log(o_pak);
11159                 }
11160 #endif
11161                 SCTP_PROBE5(send, NULL, NULL, ip, NULL, shout);
11162                 SCTP_IP_OUTPUT(ret, o_pak, NULL, NULL, vrf_id);
11163                 break;
11164 #endif
11165 #ifdef INET6
11166         case AF_INET6:
11167                 ip6->ip6_plen = htons((uint16_t)(len - sizeof(struct ip6_hdr)));
11168                 if (port) {
11169                         shout->checksum = sctp_calculate_cksum(mout, sizeof(struct ip6_hdr) + sizeof(struct udphdr));
11170                         SCTP_STAT_INCR(sctps_sendswcrc);
11171                         if ((udp->uh_sum = in6_cksum(o_pak, IPPROTO_UDP, sizeof(struct ip6_hdr), len - sizeof(struct ip6_hdr))) == 0) {
11172                                 udp->uh_sum = 0xffff;
11173                         }
11174                 } else {
11175                         mout->m_pkthdr.csum_flags = CSUM_SCTP_IPV6;
11176                         mout->m_pkthdr.csum_data = offsetof(struct sctphdr, checksum);
11177                         SCTP_STAT_INCR(sctps_sendhwcrc);
11178                 }
11179 #ifdef SCTP_PACKET_LOGGING
11180                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING) {
11181                         sctp_packet_log(o_pak);
11182                 }
11183 #endif
11184                 SCTP_PROBE5(send, NULL, NULL, ip6, NULL, shout);
11185                 SCTP_IP6_OUTPUT(ret, o_pak, NULL, NULL, NULL, vrf_id);
11186                 break;
11187 #endif
11188         default:
11189                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Unknown protocol (TSNH) type %d\n",
11190                     dst->sa_family);
11191                 sctp_m_freem(mout);
11192                 SCTP_LTRACE_ERR_RET_PKT(mout, NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EFAULT);
11193                 return;
11194         }
11195         SCTPDBG(SCTP_DEBUG_OUTPUT3, "return from send is %d\n", ret);
11196         if (port) {
11197                 UDPSTAT_INC(udps_opackets);
11198         }
11199         SCTP_STAT_INCR(sctps_sendpackets);
11200         SCTP_STAT_INCR_COUNTER64(sctps_outpackets);
11201         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
11202         if (ret) {
11203                 SCTP_STAT_INCR(sctps_senderrors);
11204         }
11205         return;
11206 }
11207
11208 void
11209 sctp_send_shutdown_complete2(struct sockaddr *src, struct sockaddr *dst,
11210     struct sctphdr *sh,
11211     uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum,
11212     uint32_t vrf_id, uint16_t port)
11213 {
11214         sctp_send_resp_msg(src, dst, sh, 0, SCTP_SHUTDOWN_COMPLETE, NULL,
11215             mflowtype, mflowid, fibnum,
11216             vrf_id, port);
11217 }
11218
11219 void
11220 sctp_send_hb(struct sctp_tcb *stcb, struct sctp_nets *net, int so_locked)
11221 {
11222         struct sctp_tmit_chunk *chk;
11223         struct sctp_heartbeat_chunk *hb;
11224         struct timeval now;
11225
11226         SCTP_TCB_LOCK_ASSERT(stcb);
11227         if (net == NULL) {
11228                 return;
11229         }
11230         (void)SCTP_GETTIME_TIMEVAL(&now);
11231         switch (net->ro._l_addr.sa.sa_family) {
11232 #ifdef INET
11233         case AF_INET:
11234                 break;
11235 #endif
11236 #ifdef INET6
11237         case AF_INET6:
11238                 break;
11239 #endif
11240         default:
11241                 return;
11242         }
11243         sctp_alloc_a_chunk(stcb, chk);
11244         if (chk == NULL) {
11245                 SCTPDBG(SCTP_DEBUG_OUTPUT4, "Gak, can't get a chunk for hb\n");
11246                 return;
11247         }
11248
11249         chk->copy_by_ref = 0;
11250         chk->rec.chunk_id.id = SCTP_HEARTBEAT_REQUEST;
11251         chk->rec.chunk_id.can_take_data = 1;
11252         chk->flags = 0;
11253         chk->asoc = &stcb->asoc;
11254         chk->send_size = sizeof(struct sctp_heartbeat_chunk);
11255
11256         chk->data = sctp_get_mbuf_for_msg(chk->send_size, 0, M_NOWAIT, 1, MT_HEADER);
11257         if (chk->data == NULL) {
11258                 sctp_free_a_chunk(stcb, chk, so_locked);
11259                 return;
11260         }
11261         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11262         SCTP_BUF_LEN(chk->data) = chk->send_size;
11263         chk->sent = SCTP_DATAGRAM_UNSENT;
11264         chk->snd_count = 0;
11265         chk->whoTo = net;
11266         atomic_add_int(&chk->whoTo->ref_count, 1);
11267         /* Now we have a mbuf that we can fill in with the details */
11268         hb = mtod(chk->data, struct sctp_heartbeat_chunk *);
11269         memset(hb, 0, sizeof(struct sctp_heartbeat_chunk));
11270         /* fill out chunk header */
11271         hb->ch.chunk_type = SCTP_HEARTBEAT_REQUEST;
11272         hb->ch.chunk_flags = 0;
11273         hb->ch.chunk_length = htons(chk->send_size);
11274         /* Fill out hb parameter */
11275         hb->heartbeat.hb_info.ph.param_type = htons(SCTP_HEARTBEAT_INFO);
11276         hb->heartbeat.hb_info.ph.param_length = htons(sizeof(struct sctp_heartbeat_info_param));
11277         hb->heartbeat.hb_info.time_value_1 = (uint32_t)now.tv_sec;
11278         hb->heartbeat.hb_info.time_value_2 = now.tv_usec;
11279         /* Did our user request this one, put it in */
11280         hb->heartbeat.hb_info.addr_family = (uint8_t)net->ro._l_addr.sa.sa_family;
11281         hb->heartbeat.hb_info.addr_len = net->ro._l_addr.sa.sa_len;
11282         if (net->dest_state & SCTP_ADDR_UNCONFIRMED) {
11283                 /*
11284                  * we only take from the entropy pool if the address is not
11285                  * confirmed.
11286                  */
11287                 net->heartbeat_random1 = hb->heartbeat.hb_info.random_value1 = sctp_select_initial_TSN(&stcb->sctp_ep->sctp_ep);
11288                 net->heartbeat_random2 = hb->heartbeat.hb_info.random_value2 = sctp_select_initial_TSN(&stcb->sctp_ep->sctp_ep);
11289         } else {
11290                 net->heartbeat_random1 = hb->heartbeat.hb_info.random_value1 = 0;
11291                 net->heartbeat_random2 = hb->heartbeat.hb_info.random_value2 = 0;
11292         }
11293         switch (net->ro._l_addr.sa.sa_family) {
11294 #ifdef INET
11295         case AF_INET:
11296                 memcpy(hb->heartbeat.hb_info.address,
11297                     &net->ro._l_addr.sin.sin_addr,
11298                     sizeof(net->ro._l_addr.sin.sin_addr));
11299                 break;
11300 #endif
11301 #ifdef INET6
11302         case AF_INET6:
11303                 memcpy(hb->heartbeat.hb_info.address,
11304                     &net->ro._l_addr.sin6.sin6_addr,
11305                     sizeof(net->ro._l_addr.sin6.sin6_addr));
11306                 break;
11307 #endif
11308         default:
11309                 if (chk->data) {
11310                         sctp_m_freem(chk->data);
11311                         chk->data = NULL;
11312                 }
11313                 sctp_free_a_chunk(stcb, chk, so_locked);
11314                 return;
11315                 break;
11316         }
11317         net->hb_responded = 0;
11318         TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
11319         stcb->asoc.ctrl_queue_cnt++;
11320         SCTP_STAT_INCR(sctps_sendheartbeat);
11321         return;
11322 }
11323
11324 void
11325 sctp_send_ecn_echo(struct sctp_tcb *stcb, struct sctp_nets *net,
11326     uint32_t high_tsn)
11327 {
11328         struct sctp_association *asoc;
11329         struct sctp_ecne_chunk *ecne;
11330         struct sctp_tmit_chunk *chk;
11331
11332         if (net == NULL) {
11333                 return;
11334         }
11335         asoc = &stcb->asoc;
11336         SCTP_TCB_LOCK_ASSERT(stcb);
11337         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
11338                 if ((chk->rec.chunk_id.id == SCTP_ECN_ECHO) && (net == chk->whoTo)) {
11339                         /* found a previous ECN_ECHO update it if needed */
11340                         uint32_t cnt, ctsn;
11341
11342                         ecne = mtod(chk->data, struct sctp_ecne_chunk *);
11343                         ctsn = ntohl(ecne->tsn);
11344                         if (SCTP_TSN_GT(high_tsn, ctsn)) {
11345                                 ecne->tsn = htonl(high_tsn);
11346                                 SCTP_STAT_INCR(sctps_queue_upd_ecne);
11347                         }
11348                         cnt = ntohl(ecne->num_pkts_since_cwr);
11349                         cnt++;
11350                         ecne->num_pkts_since_cwr = htonl(cnt);
11351                         return;
11352                 }
11353         }
11354         /* nope could not find one to update so we must build one */
11355         sctp_alloc_a_chunk(stcb, chk);
11356         if (chk == NULL) {
11357                 return;
11358         }
11359         SCTP_STAT_INCR(sctps_queue_upd_ecne);
11360         chk->copy_by_ref = 0;
11361         chk->rec.chunk_id.id = SCTP_ECN_ECHO;
11362         chk->rec.chunk_id.can_take_data = 0;
11363         chk->flags = 0;
11364         chk->asoc = &stcb->asoc;
11365         chk->send_size = sizeof(struct sctp_ecne_chunk);
11366         chk->data = sctp_get_mbuf_for_msg(chk->send_size, 0, M_NOWAIT, 1, MT_HEADER);
11367         if (chk->data == NULL) {
11368                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
11369                 return;
11370         }
11371         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11372         SCTP_BUF_LEN(chk->data) = chk->send_size;
11373         chk->sent = SCTP_DATAGRAM_UNSENT;
11374         chk->snd_count = 0;
11375         chk->whoTo = net;
11376         atomic_add_int(&chk->whoTo->ref_count, 1);
11377
11378         stcb->asoc.ecn_echo_cnt_onq++;
11379         ecne = mtod(chk->data, struct sctp_ecne_chunk *);
11380         ecne->ch.chunk_type = SCTP_ECN_ECHO;
11381         ecne->ch.chunk_flags = 0;
11382         ecne->ch.chunk_length = htons(sizeof(struct sctp_ecne_chunk));
11383         ecne->tsn = htonl(high_tsn);
11384         ecne->num_pkts_since_cwr = htonl(1);
11385         TAILQ_INSERT_HEAD(&stcb->asoc.control_send_queue, chk, sctp_next);
11386         asoc->ctrl_queue_cnt++;
11387 }
11388
11389 void
11390 sctp_send_packet_dropped(struct sctp_tcb *stcb, struct sctp_nets *net,
11391     struct mbuf *m, int len, int iphlen, int bad_crc)
11392 {
11393         struct sctp_association *asoc;
11394         struct sctp_pktdrop_chunk *drp;
11395         struct sctp_tmit_chunk *chk;
11396         uint8_t *datap;
11397         int was_trunc = 0;
11398         int fullsz = 0;
11399         long spc;
11400         int offset;
11401         struct sctp_chunkhdr *ch, chunk_buf;
11402         unsigned int chk_length;
11403
11404         if (!stcb) {
11405                 return;
11406         }
11407         asoc = &stcb->asoc;
11408         SCTP_TCB_LOCK_ASSERT(stcb);
11409         if (asoc->pktdrop_supported == 0) {
11410                 /*-
11411                  * peer must declare support before I send one.
11412                  */
11413                 return;
11414         }
11415         if (stcb->sctp_socket == NULL) {
11416                 return;
11417         }
11418         sctp_alloc_a_chunk(stcb, chk);
11419         if (chk == NULL) {
11420                 return;
11421         }
11422         chk->copy_by_ref = 0;
11423         chk->rec.chunk_id.id = SCTP_PACKET_DROPPED;
11424         chk->rec.chunk_id.can_take_data = 1;
11425         chk->flags = 0;
11426         len -= iphlen;
11427         chk->send_size = len;
11428         /* Validate that we do not have an ABORT in here. */
11429         offset = iphlen + sizeof(struct sctphdr);
11430         ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, offset,
11431             sizeof(*ch), (uint8_t *)&chunk_buf);
11432         while (ch != NULL) {
11433                 chk_length = ntohs(ch->chunk_length);
11434                 if (chk_length < sizeof(*ch)) {
11435                         /* break to abort land */
11436                         break;
11437                 }
11438                 switch (ch->chunk_type) {
11439                 case SCTP_PACKET_DROPPED:
11440                 case SCTP_ABORT_ASSOCIATION:
11441                 case SCTP_INITIATION_ACK:
11442                         /**
11443                          * We don't respond with an PKT-DROP to an ABORT
11444                          * or PKT-DROP. We also do not respond to an
11445                          * INIT-ACK, because we can't know if the initiation
11446                          * tag is correct or not.
11447                          */
11448                         sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
11449                         return;
11450                 default:
11451                         break;
11452                 }
11453                 offset += SCTP_SIZE32(chk_length);
11454                 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, offset,
11455                     sizeof(*ch), (uint8_t *)&chunk_buf);
11456         }
11457
11458         if ((len + SCTP_MAX_OVERHEAD + sizeof(struct sctp_pktdrop_chunk)) >
11459             min(stcb->asoc.smallest_mtu, MCLBYTES)) {
11460                 /*
11461                  * only send 1 mtu worth, trim off the excess on the end.
11462                  */
11463                 fullsz = len;
11464                 len = min(stcb->asoc.smallest_mtu, MCLBYTES) - SCTP_MAX_OVERHEAD;
11465                 was_trunc = 1;
11466         }
11467         chk->asoc = &stcb->asoc;
11468         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
11469         if (chk->data == NULL) {
11470 jump_out:
11471                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
11472                 return;
11473         }
11474         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11475         drp = mtod(chk->data, struct sctp_pktdrop_chunk *);
11476         if (drp == NULL) {
11477                 sctp_m_freem(chk->data);
11478                 chk->data = NULL;
11479                 goto jump_out;
11480         }
11481         chk->book_size = SCTP_SIZE32((chk->send_size + sizeof(struct sctp_pktdrop_chunk) +
11482             sizeof(struct sctphdr) + SCTP_MED_OVERHEAD));
11483         chk->book_size_scale = 0;
11484         if (was_trunc) {
11485                 drp->ch.chunk_flags = SCTP_PACKET_TRUNCATED;
11486                 drp->trunc_len = htons(fullsz);
11487                 /*
11488                  * Len is already adjusted to size minus overhead above take
11489                  * out the pkt_drop chunk itself from it.
11490                  */
11491                 chk->send_size = (uint16_t)(len - sizeof(struct sctp_pktdrop_chunk));
11492                 len = chk->send_size;
11493         } else {
11494                 /* no truncation needed */
11495                 drp->ch.chunk_flags = 0;
11496                 drp->trunc_len = htons(0);
11497         }
11498         if (bad_crc) {
11499                 drp->ch.chunk_flags |= SCTP_BADCRC;
11500         }
11501         chk->send_size += sizeof(struct sctp_pktdrop_chunk);
11502         SCTP_BUF_LEN(chk->data) = chk->send_size;
11503         chk->sent = SCTP_DATAGRAM_UNSENT;
11504         chk->snd_count = 0;
11505         if (net) {
11506                 /* we should hit here */
11507                 chk->whoTo = net;
11508                 atomic_add_int(&chk->whoTo->ref_count, 1);
11509         } else {
11510                 chk->whoTo = NULL;
11511         }
11512         drp->ch.chunk_type = SCTP_PACKET_DROPPED;
11513         drp->ch.chunk_length = htons(chk->send_size);
11514         spc = SCTP_SB_LIMIT_RCV(stcb->sctp_socket);
11515         if (spc < 0) {
11516                 spc = 0;
11517         }
11518         drp->bottle_bw = htonl(spc);
11519         if (asoc->my_rwnd) {
11520                 drp->current_onq = htonl(asoc->size_on_reasm_queue +
11521                     asoc->size_on_all_streams +
11522                     asoc->my_rwnd_control_len +
11523                     stcb->sctp_socket->so_rcv.sb_cc);
11524         } else {
11525                 /*-
11526                  * If my rwnd is 0, possibly from mbuf depletion as well as
11527                  * space used, tell the peer there is NO space aka onq == bw
11528                  */
11529                 drp->current_onq = htonl(spc);
11530         }
11531         drp->reserved = 0;
11532         datap = drp->data;
11533         m_copydata(m, iphlen, len, (caddr_t)datap);
11534         TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
11535         asoc->ctrl_queue_cnt++;
11536 }
11537
11538 void
11539 sctp_send_cwr(struct sctp_tcb *stcb, struct sctp_nets *net, uint32_t high_tsn, uint8_t override)
11540 {
11541         struct sctp_association *asoc;
11542         struct sctp_cwr_chunk *cwr;
11543         struct sctp_tmit_chunk *chk;
11544
11545         SCTP_TCB_LOCK_ASSERT(stcb);
11546         if (net == NULL) {
11547                 return;
11548         }
11549         asoc = &stcb->asoc;
11550         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
11551                 if ((chk->rec.chunk_id.id == SCTP_ECN_CWR) && (net == chk->whoTo)) {
11552                         /*
11553                          * found a previous CWR queued to same destination
11554                          * update it if needed
11555                          */
11556                         uint32_t ctsn;
11557
11558                         cwr = mtod(chk->data, struct sctp_cwr_chunk *);
11559                         ctsn = ntohl(cwr->tsn);
11560                         if (SCTP_TSN_GT(high_tsn, ctsn)) {
11561                                 cwr->tsn = htonl(high_tsn);
11562                         }
11563                         if (override & SCTP_CWR_REDUCE_OVERRIDE) {
11564                                 /* Make sure override is carried */
11565                                 cwr->ch.chunk_flags |= SCTP_CWR_REDUCE_OVERRIDE;
11566                         }
11567                         return;
11568                 }
11569         }
11570         sctp_alloc_a_chunk(stcb, chk);
11571         if (chk == NULL) {
11572                 return;
11573         }
11574         chk->copy_by_ref = 0;
11575         chk->rec.chunk_id.id = SCTP_ECN_CWR;
11576         chk->rec.chunk_id.can_take_data = 1;
11577         chk->flags = 0;
11578         chk->asoc = &stcb->asoc;
11579         chk->send_size = sizeof(struct sctp_cwr_chunk);
11580         chk->data = sctp_get_mbuf_for_msg(chk->send_size, 0, M_NOWAIT, 1, MT_HEADER);
11581         if (chk->data == NULL) {
11582                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
11583                 return;
11584         }
11585         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11586         SCTP_BUF_LEN(chk->data) = chk->send_size;
11587         chk->sent = SCTP_DATAGRAM_UNSENT;
11588         chk->snd_count = 0;
11589         chk->whoTo = net;
11590         atomic_add_int(&chk->whoTo->ref_count, 1);
11591         cwr = mtod(chk->data, struct sctp_cwr_chunk *);
11592         cwr->ch.chunk_type = SCTP_ECN_CWR;
11593         cwr->ch.chunk_flags = override;
11594         cwr->ch.chunk_length = htons(sizeof(struct sctp_cwr_chunk));
11595         cwr->tsn = htonl(high_tsn);
11596         TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
11597         asoc->ctrl_queue_cnt++;
11598 }
11599
11600 static int
11601 sctp_add_stream_reset_out(struct sctp_tcb *stcb, struct sctp_tmit_chunk *chk,
11602     uint32_t seq, uint32_t resp_seq, uint32_t last_sent)
11603 {
11604         uint16_t len, old_len, i;
11605         struct sctp_stream_reset_out_request *req_out;
11606         struct sctp_chunkhdr *ch;
11607         int at;
11608         int number_entries = 0;
11609
11610         ch = mtod(chk->data, struct sctp_chunkhdr *);
11611         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11612         /* get to new offset for the param. */
11613         req_out = (struct sctp_stream_reset_out_request *)((caddr_t)ch + len);
11614         /* now how long will this param be? */
11615         for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
11616                 if ((stcb->asoc.strmout[i].state == SCTP_STREAM_RESET_PENDING) &&
11617                     (stcb->asoc.strmout[i].chunks_on_queues == 0) &&
11618                     TAILQ_EMPTY(&stcb->asoc.strmout[i].outqueue)) {
11619                         number_entries++;
11620                 }
11621         }
11622         if (number_entries == 0) {
11623                 return (0);
11624         }
11625         if (number_entries == stcb->asoc.streamoutcnt) {
11626                 number_entries = 0;
11627         }
11628         if (number_entries > SCTP_MAX_STREAMS_AT_ONCE_RESET) {
11629                 number_entries = SCTP_MAX_STREAMS_AT_ONCE_RESET;
11630         }
11631         len = (uint16_t)(sizeof(struct sctp_stream_reset_out_request) + (sizeof(uint16_t) * number_entries));
11632         req_out->ph.param_type = htons(SCTP_STR_RESET_OUT_REQUEST);
11633         req_out->ph.param_length = htons(len);
11634         req_out->request_seq = htonl(seq);
11635         req_out->response_seq = htonl(resp_seq);
11636         req_out->send_reset_at_tsn = htonl(last_sent);
11637         at = 0;
11638         if (number_entries) {
11639                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
11640                         if ((stcb->asoc.strmout[i].state == SCTP_STREAM_RESET_PENDING) &&
11641                             (stcb->asoc.strmout[i].chunks_on_queues == 0) &&
11642                             TAILQ_EMPTY(&stcb->asoc.strmout[i].outqueue)) {
11643                                 req_out->list_of_streams[at] = htons(i);
11644                                 at++;
11645                                 stcb->asoc.strmout[i].state = SCTP_STREAM_RESET_IN_FLIGHT;
11646                                 if (at >= number_entries) {
11647                                         break;
11648                                 }
11649                         }
11650                 }
11651         } else {
11652                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
11653                         stcb->asoc.strmout[i].state = SCTP_STREAM_RESET_IN_FLIGHT;
11654                 }
11655         }
11656         if (SCTP_SIZE32(len) > len) {
11657                 /*-
11658                  * Need to worry about the pad we may end up adding to the
11659                  * end. This is easy since the struct is either aligned to 4
11660                  * bytes or 2 bytes off.
11661                  */
11662                 req_out->list_of_streams[number_entries] = 0;
11663         }
11664         /* now fix the chunk length */
11665         ch->chunk_length = htons(len + old_len);
11666         chk->book_size = len + old_len;
11667         chk->book_size_scale = 0;
11668         chk->send_size = SCTP_SIZE32(chk->book_size);
11669         SCTP_BUF_LEN(chk->data) = chk->send_size;
11670         return (1);
11671 }
11672
11673 static void
11674 sctp_add_stream_reset_in(struct sctp_tmit_chunk *chk,
11675     int number_entries, uint16_t *list,
11676     uint32_t seq)
11677 {
11678         uint16_t len, old_len, i;
11679         struct sctp_stream_reset_in_request *req_in;
11680         struct sctp_chunkhdr *ch;
11681
11682         ch = mtod(chk->data, struct sctp_chunkhdr *);
11683         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11684
11685         /* get to new offset for the param. */
11686         req_in = (struct sctp_stream_reset_in_request *)((caddr_t)ch + len);
11687         /* now how long will this param be? */
11688         len = (uint16_t)(sizeof(struct sctp_stream_reset_in_request) + (sizeof(uint16_t) * number_entries));
11689         req_in->ph.param_type = htons(SCTP_STR_RESET_IN_REQUEST);
11690         req_in->ph.param_length = htons(len);
11691         req_in->request_seq = htonl(seq);
11692         if (number_entries) {
11693                 for (i = 0; i < number_entries; i++) {
11694                         req_in->list_of_streams[i] = htons(list[i]);
11695                 }
11696         }
11697         if (SCTP_SIZE32(len) > len) {
11698                 /*-
11699                  * Need to worry about the pad we may end up adding to the
11700                  * end. This is easy since the struct is either aligned to 4
11701                  * bytes or 2 bytes off.
11702                  */
11703                 req_in->list_of_streams[number_entries] = 0;
11704         }
11705         /* now fix the chunk length */
11706         ch->chunk_length = htons(len + old_len);
11707         chk->book_size = len + old_len;
11708         chk->book_size_scale = 0;
11709         chk->send_size = SCTP_SIZE32(chk->book_size);
11710         SCTP_BUF_LEN(chk->data) = chk->send_size;
11711         return;
11712 }
11713
11714 static void
11715 sctp_add_stream_reset_tsn(struct sctp_tmit_chunk *chk,
11716     uint32_t seq)
11717 {
11718         uint16_t len, old_len;
11719         struct sctp_stream_reset_tsn_request *req_tsn;
11720         struct sctp_chunkhdr *ch;
11721
11722         ch = mtod(chk->data, struct sctp_chunkhdr *);
11723         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11724
11725         /* get to new offset for the param. */
11726         req_tsn = (struct sctp_stream_reset_tsn_request *)((caddr_t)ch + len);
11727         /* now how long will this param be? */
11728         len = sizeof(struct sctp_stream_reset_tsn_request);
11729         req_tsn->ph.param_type = htons(SCTP_STR_RESET_TSN_REQUEST);
11730         req_tsn->ph.param_length = htons(len);
11731         req_tsn->request_seq = htonl(seq);
11732
11733         /* now fix the chunk length */
11734         ch->chunk_length = htons(len + old_len);
11735         chk->send_size = len + old_len;
11736         chk->book_size = SCTP_SIZE32(chk->send_size);
11737         chk->book_size_scale = 0;
11738         SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size);
11739         return;
11740 }
11741
11742 void
11743 sctp_add_stream_reset_result(struct sctp_tmit_chunk *chk,
11744     uint32_t resp_seq, uint32_t result)
11745 {
11746         uint16_t len, old_len;
11747         struct sctp_stream_reset_response *resp;
11748         struct sctp_chunkhdr *ch;
11749
11750         ch = mtod(chk->data, struct sctp_chunkhdr *);
11751         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11752
11753         /* get to new offset for the param. */
11754         resp = (struct sctp_stream_reset_response *)((caddr_t)ch + len);
11755         /* now how long will this param be? */
11756         len = sizeof(struct sctp_stream_reset_response);
11757         resp->ph.param_type = htons(SCTP_STR_RESET_RESPONSE);
11758         resp->ph.param_length = htons(len);
11759         resp->response_seq = htonl(resp_seq);
11760         resp->result = ntohl(result);
11761
11762         /* now fix the chunk length */
11763         ch->chunk_length = htons(len + old_len);
11764         chk->book_size = len + old_len;
11765         chk->book_size_scale = 0;
11766         chk->send_size = SCTP_SIZE32(chk->book_size);
11767         SCTP_BUF_LEN(chk->data) = chk->send_size;
11768         return;
11769 }
11770
11771 void
11772 sctp_send_deferred_reset_response(struct sctp_tcb *stcb,
11773     struct sctp_stream_reset_list *ent,
11774     int response)
11775 {
11776         struct sctp_association *asoc;
11777         struct sctp_tmit_chunk *chk;
11778         struct sctp_chunkhdr *ch;
11779
11780         asoc = &stcb->asoc;
11781
11782         /*
11783          * Reset our last reset action to the new one IP -> response
11784          * (PERFORMED probably). This assures that if we fail to send, a
11785          * retran from the peer will get the new response.
11786          */
11787         asoc->last_reset_action[0] = response;
11788         if (asoc->stream_reset_outstanding) {
11789                 return;
11790         }
11791         sctp_alloc_a_chunk(stcb, chk);
11792         if (chk == NULL) {
11793                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
11794                 return;
11795         }
11796         chk->copy_by_ref = 0;
11797         chk->rec.chunk_id.id = SCTP_STREAM_RESET;
11798         chk->rec.chunk_id.can_take_data = 0;
11799         chk->flags = 0;
11800         chk->asoc = &stcb->asoc;
11801         chk->book_size = sizeof(struct sctp_chunkhdr);
11802         chk->send_size = SCTP_SIZE32(chk->book_size);
11803         chk->book_size_scale = 0;
11804         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
11805         if (chk->data == NULL) {
11806                 sctp_free_a_chunk(stcb, chk, SCTP_SO_LOCKED);
11807                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
11808                 return;
11809         }
11810         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11811         /* setup chunk parameters */
11812         chk->sent = SCTP_DATAGRAM_UNSENT;
11813         chk->snd_count = 0;
11814         if (stcb->asoc.alternate) {
11815                 chk->whoTo = stcb->asoc.alternate;
11816         } else {
11817                 chk->whoTo = stcb->asoc.primary_destination;
11818         }
11819         ch = mtod(chk->data, struct sctp_chunkhdr *);
11820         ch->chunk_type = SCTP_STREAM_RESET;
11821         ch->chunk_flags = 0;
11822         ch->chunk_length = htons(chk->book_size);
11823         atomic_add_int(&chk->whoTo->ref_count, 1);
11824         SCTP_BUF_LEN(chk->data) = chk->send_size;
11825         sctp_add_stream_reset_result(chk, ent->seq, response);
11826         /* insert the chunk for sending */
11827         TAILQ_INSERT_TAIL(&asoc->control_send_queue,
11828             chk,
11829             sctp_next);
11830         asoc->ctrl_queue_cnt++;
11831 }
11832
11833 void
11834 sctp_add_stream_reset_result_tsn(struct sctp_tmit_chunk *chk,
11835     uint32_t resp_seq, uint32_t result,
11836     uint32_t send_una, uint32_t recv_next)
11837 {
11838         uint16_t len, old_len;
11839         struct sctp_stream_reset_response_tsn *resp;
11840         struct sctp_chunkhdr *ch;
11841
11842         ch = mtod(chk->data, struct sctp_chunkhdr *);
11843         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11844
11845         /* get to new offset for the param. */
11846         resp = (struct sctp_stream_reset_response_tsn *)((caddr_t)ch + len);
11847         /* now how long will this param be? */
11848         len = sizeof(struct sctp_stream_reset_response_tsn);
11849         resp->ph.param_type = htons(SCTP_STR_RESET_RESPONSE);
11850         resp->ph.param_length = htons(len);
11851         resp->response_seq = htonl(resp_seq);
11852         resp->result = htonl(result);
11853         resp->senders_next_tsn = htonl(send_una);
11854         resp->receivers_next_tsn = htonl(recv_next);
11855
11856         /* now fix the chunk length */
11857         ch->chunk_length = htons(len + old_len);
11858         chk->book_size = len + old_len;
11859         chk->send_size = SCTP_SIZE32(chk->book_size);
11860         chk->book_size_scale = 0;
11861         SCTP_BUF_LEN(chk->data) = chk->send_size;
11862         return;
11863 }
11864
11865 static void
11866 sctp_add_an_out_stream(struct sctp_tmit_chunk *chk,
11867     uint32_t seq,
11868     uint16_t adding)
11869 {
11870         uint16_t len, old_len;
11871         struct sctp_chunkhdr *ch;
11872         struct sctp_stream_reset_add_strm *addstr;
11873
11874         ch = mtod(chk->data, struct sctp_chunkhdr *);
11875         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11876
11877         /* get to new offset for the param. */
11878         addstr = (struct sctp_stream_reset_add_strm *)((caddr_t)ch + len);
11879         /* now how long will this param be? */
11880         len = sizeof(struct sctp_stream_reset_add_strm);
11881
11882         /* Fill it out. */
11883         addstr->ph.param_type = htons(SCTP_STR_RESET_ADD_OUT_STREAMS);
11884         addstr->ph.param_length = htons(len);
11885         addstr->request_seq = htonl(seq);
11886         addstr->number_of_streams = htons(adding);
11887         addstr->reserved = 0;
11888
11889         /* now fix the chunk length */
11890         ch->chunk_length = htons(len + old_len);
11891         chk->send_size = len + old_len;
11892         chk->book_size = SCTP_SIZE32(chk->send_size);
11893         chk->book_size_scale = 0;
11894         SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size);
11895         return;
11896 }
11897
11898 static void
11899 sctp_add_an_in_stream(struct sctp_tmit_chunk *chk,
11900     uint32_t seq,
11901     uint16_t adding)
11902 {
11903         uint16_t len, old_len;
11904         struct sctp_chunkhdr *ch;
11905         struct sctp_stream_reset_add_strm *addstr;
11906
11907         ch = mtod(chk->data, struct sctp_chunkhdr *);
11908         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11909
11910         /* get to new offset for the param. */
11911         addstr = (struct sctp_stream_reset_add_strm *)((caddr_t)ch + len);
11912         /* now how long will this param be? */
11913         len = sizeof(struct sctp_stream_reset_add_strm);
11914         /* Fill it out. */
11915         addstr->ph.param_type = htons(SCTP_STR_RESET_ADD_IN_STREAMS);
11916         addstr->ph.param_length = htons(len);
11917         addstr->request_seq = htonl(seq);
11918         addstr->number_of_streams = htons(adding);
11919         addstr->reserved = 0;
11920
11921         /* now fix the chunk length */
11922         ch->chunk_length = htons(len + old_len);
11923         chk->send_size = len + old_len;
11924         chk->book_size = SCTP_SIZE32(chk->send_size);
11925         chk->book_size_scale = 0;
11926         SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size);
11927         return;
11928 }
11929
11930 int
11931 sctp_send_stream_reset_out_if_possible(struct sctp_tcb *stcb, int so_locked)
11932 {
11933         struct sctp_association *asoc;
11934         struct sctp_tmit_chunk *chk;
11935         struct sctp_chunkhdr *ch;
11936         uint32_t seq;
11937
11938         asoc = &stcb->asoc;
11939         asoc->trigger_reset = 0;
11940         if (asoc->stream_reset_outstanding) {
11941                 return (EALREADY);
11942         }
11943         sctp_alloc_a_chunk(stcb, chk);
11944         if (chk == NULL) {
11945                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
11946                 return (ENOMEM);
11947         }
11948         chk->copy_by_ref = 0;
11949         chk->rec.chunk_id.id = SCTP_STREAM_RESET;
11950         chk->rec.chunk_id.can_take_data = 0;
11951         chk->flags = 0;
11952         chk->asoc = &stcb->asoc;
11953         chk->book_size = sizeof(struct sctp_chunkhdr);
11954         chk->send_size = SCTP_SIZE32(chk->book_size);
11955         chk->book_size_scale = 0;
11956         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
11957         if (chk->data == NULL) {
11958                 sctp_free_a_chunk(stcb, chk, so_locked);
11959                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
11960                 return (ENOMEM);
11961         }
11962         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11963
11964         /* setup chunk parameters */
11965         chk->sent = SCTP_DATAGRAM_UNSENT;
11966         chk->snd_count = 0;
11967         if (stcb->asoc.alternate) {
11968                 chk->whoTo = stcb->asoc.alternate;
11969         } else {
11970                 chk->whoTo = stcb->asoc.primary_destination;
11971         }
11972         ch = mtod(chk->data, struct sctp_chunkhdr *);
11973         ch->chunk_type = SCTP_STREAM_RESET;
11974         ch->chunk_flags = 0;
11975         ch->chunk_length = htons(chk->book_size);
11976         atomic_add_int(&chk->whoTo->ref_count, 1);
11977         SCTP_BUF_LEN(chk->data) = chk->send_size;
11978         seq = stcb->asoc.str_reset_seq_out;
11979         if (sctp_add_stream_reset_out(stcb, chk, seq, (stcb->asoc.str_reset_seq_in - 1), (stcb->asoc.sending_seq - 1))) {
11980                 seq++;
11981                 asoc->stream_reset_outstanding++;
11982         } else {
11983                 m_freem(chk->data);
11984                 chk->data = NULL;
11985                 sctp_free_a_chunk(stcb, chk, so_locked);
11986                 return (ENOENT);
11987         }
11988         asoc->str_reset = chk;
11989         /* insert the chunk for sending */
11990         TAILQ_INSERT_TAIL(&asoc->control_send_queue,
11991             chk,
11992             sctp_next);
11993         asoc->ctrl_queue_cnt++;
11994
11995         if (stcb->asoc.send_sack) {
11996                 sctp_send_sack(stcb, so_locked);
11997         }
11998         sctp_timer_start(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb, chk->whoTo);
11999         return (0);
12000 }
12001
12002 int
12003 sctp_send_str_reset_req(struct sctp_tcb *stcb,
12004     uint16_t number_entries, uint16_t *list,
12005     uint8_t send_in_req,
12006     uint8_t send_tsn_req,
12007     uint8_t add_stream,
12008     uint16_t adding_o,
12009     uint16_t adding_i, uint8_t peer_asked)
12010 {
12011         struct sctp_association *asoc;
12012         struct sctp_tmit_chunk *chk;
12013         struct sctp_chunkhdr *ch;
12014         int can_send_out_req = 0;
12015         uint32_t seq;
12016
12017         SCTP_TCB_LOCK_ASSERT(stcb);
12018
12019         asoc = &stcb->asoc;
12020         if (asoc->stream_reset_outstanding) {
12021                 /*-
12022                  * Already one pending, must get ACK back to clear the flag.
12023                  */
12024                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EBUSY);
12025                 return (EBUSY);
12026         }
12027         if ((send_in_req == 0) && (send_tsn_req == 0) &&
12028             (add_stream == 0)) {
12029                 /* nothing to do */
12030                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12031                 return (EINVAL);
12032         }
12033         if (send_tsn_req && send_in_req) {
12034                 /* error, can't do that */
12035                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12036                 return (EINVAL);
12037         } else if (send_in_req) {
12038                 can_send_out_req = 1;
12039         }
12040         if (number_entries > (MCLBYTES -
12041             SCTP_MIN_OVERHEAD -
12042             sizeof(struct sctp_chunkhdr) -
12043             sizeof(struct sctp_stream_reset_out_request)) /
12044             sizeof(uint16_t)) {
12045                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12046                 return (ENOMEM);
12047         }
12048         sctp_alloc_a_chunk(stcb, chk);
12049         if (chk == NULL) {
12050                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12051                 return (ENOMEM);
12052         }
12053         chk->copy_by_ref = 0;
12054         chk->rec.chunk_id.id = SCTP_STREAM_RESET;
12055         chk->rec.chunk_id.can_take_data = 0;
12056         chk->flags = 0;
12057         chk->asoc = &stcb->asoc;
12058         chk->book_size = sizeof(struct sctp_chunkhdr);
12059         chk->send_size = SCTP_SIZE32(chk->book_size);
12060         chk->book_size_scale = 0;
12061         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
12062         if (chk->data == NULL) {
12063                 sctp_free_a_chunk(stcb, chk, SCTP_SO_LOCKED);
12064                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12065                 return (ENOMEM);
12066         }
12067         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
12068
12069         /* setup chunk parameters */
12070         chk->sent = SCTP_DATAGRAM_UNSENT;
12071         chk->snd_count = 0;
12072         if (stcb->asoc.alternate) {
12073                 chk->whoTo = stcb->asoc.alternate;
12074         } else {
12075                 chk->whoTo = stcb->asoc.primary_destination;
12076         }
12077         atomic_add_int(&chk->whoTo->ref_count, 1);
12078         ch = mtod(chk->data, struct sctp_chunkhdr *);
12079         ch->chunk_type = SCTP_STREAM_RESET;
12080         ch->chunk_flags = 0;
12081         ch->chunk_length = htons(chk->book_size);
12082         SCTP_BUF_LEN(chk->data) = chk->send_size;
12083
12084         seq = stcb->asoc.str_reset_seq_out;
12085         if (can_send_out_req) {
12086                 int ret;
12087
12088                 ret = sctp_add_stream_reset_out(stcb, chk, seq, (stcb->asoc.str_reset_seq_in - 1), (stcb->asoc.sending_seq - 1));
12089                 if (ret) {
12090                         seq++;
12091                         asoc->stream_reset_outstanding++;
12092                 }
12093         }
12094         if ((add_stream & 1) &&
12095             ((stcb->asoc.strm_realoutsize - stcb->asoc.streamoutcnt) < adding_o)) {
12096                 /* Need to allocate more */
12097                 struct sctp_stream_out *oldstream;
12098                 struct sctp_stream_queue_pending *sp, *nsp;
12099                 int i;
12100 #if defined(SCTP_DETAILED_STR_STATS)
12101                 int j;
12102 #endif
12103
12104                 oldstream = stcb->asoc.strmout;
12105                 /* get some more */
12106                 SCTP_MALLOC(stcb->asoc.strmout, struct sctp_stream_out *,
12107                     (stcb->asoc.streamoutcnt + adding_o) * sizeof(struct sctp_stream_out),
12108                     SCTP_M_STRMO);
12109                 if (stcb->asoc.strmout == NULL) {
12110                         uint8_t x;
12111
12112                         stcb->asoc.strmout = oldstream;
12113                         /* Turn off the bit */
12114                         x = add_stream & 0xfe;
12115                         add_stream = x;
12116                         goto skip_stuff;
12117                 }
12118                 /*
12119                  * Ok now we proceed with copying the old out stuff and
12120                  * initializing the new stuff.
12121                  */
12122                 stcb->asoc.ss_functions.sctp_ss_clear(stcb, &stcb->asoc, false);
12123                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
12124                         TAILQ_INIT(&stcb->asoc.strmout[i].outqueue);
12125                         /* FIX ME FIX ME */
12126                         /*
12127                          * This should be a SS_COPY operation FIX ME STREAM
12128                          * SCHEDULER EXPERT
12129                          */
12130                         stcb->asoc.ss_functions.sctp_ss_init_stream(stcb, &stcb->asoc.strmout[i], &oldstream[i]);
12131                         stcb->asoc.strmout[i].chunks_on_queues = oldstream[i].chunks_on_queues;
12132 #if defined(SCTP_DETAILED_STR_STATS)
12133                         for (j = 0; j < SCTP_PR_SCTP_MAX + 1; j++) {
12134                                 stcb->asoc.strmout[i].abandoned_sent[j] = oldstream[i].abandoned_sent[j];
12135                                 stcb->asoc.strmout[i].abandoned_unsent[j] = oldstream[i].abandoned_unsent[j];
12136                         }
12137 #else
12138                         stcb->asoc.strmout[i].abandoned_sent[0] = oldstream[i].abandoned_sent[0];
12139                         stcb->asoc.strmout[i].abandoned_unsent[0] = oldstream[i].abandoned_unsent[0];
12140 #endif
12141                         stcb->asoc.strmout[i].next_mid_ordered = oldstream[i].next_mid_ordered;
12142                         stcb->asoc.strmout[i].next_mid_unordered = oldstream[i].next_mid_unordered;
12143                         stcb->asoc.strmout[i].last_msg_incomplete = oldstream[i].last_msg_incomplete;
12144                         stcb->asoc.strmout[i].sid = i;
12145                         stcb->asoc.strmout[i].state = oldstream[i].state;
12146                         /* now anything on those queues? */
12147                         TAILQ_FOREACH_SAFE(sp, &oldstream[i].outqueue, next, nsp) {
12148                                 TAILQ_REMOVE(&oldstream[i].outqueue, sp, next);
12149                                 TAILQ_INSERT_TAIL(&stcb->asoc.strmout[i].outqueue, sp, next);
12150                         }
12151                 }
12152                 /* now the new streams */
12153                 stcb->asoc.ss_functions.sctp_ss_init(stcb, &stcb->asoc);
12154                 for (i = stcb->asoc.streamoutcnt; i < (stcb->asoc.streamoutcnt + adding_o); i++) {
12155                         TAILQ_INIT(&stcb->asoc.strmout[i].outqueue);
12156                         stcb->asoc.strmout[i].chunks_on_queues = 0;
12157 #if defined(SCTP_DETAILED_STR_STATS)
12158                         for (j = 0; j < SCTP_PR_SCTP_MAX + 1; j++) {
12159                                 stcb->asoc.strmout[i].abandoned_sent[j] = 0;
12160                                 stcb->asoc.strmout[i].abandoned_unsent[j] = 0;
12161                         }
12162 #else
12163                         stcb->asoc.strmout[i].abandoned_sent[0] = 0;
12164                         stcb->asoc.strmout[i].abandoned_unsent[0] = 0;
12165 #endif
12166                         stcb->asoc.strmout[i].next_mid_ordered = 0;
12167                         stcb->asoc.strmout[i].next_mid_unordered = 0;
12168                         stcb->asoc.strmout[i].sid = i;
12169                         stcb->asoc.strmout[i].last_msg_incomplete = 0;
12170                         stcb->asoc.ss_functions.sctp_ss_init_stream(stcb, &stcb->asoc.strmout[i], NULL);
12171                         stcb->asoc.strmout[i].state = SCTP_STREAM_CLOSED;
12172                 }
12173                 stcb->asoc.strm_realoutsize = stcb->asoc.streamoutcnt + adding_o;
12174                 SCTP_FREE(oldstream, SCTP_M_STRMO);
12175         }
12176 skip_stuff:
12177         if ((add_stream & 1) && (adding_o > 0)) {
12178                 asoc->strm_pending_add_size = adding_o;
12179                 asoc->peer_req_out = peer_asked;
12180                 sctp_add_an_out_stream(chk, seq, adding_o);
12181                 seq++;
12182                 asoc->stream_reset_outstanding++;
12183         }
12184         if ((add_stream & 2) && (adding_i > 0)) {
12185                 sctp_add_an_in_stream(chk, seq, adding_i);
12186                 seq++;
12187                 asoc->stream_reset_outstanding++;
12188         }
12189         if (send_in_req) {
12190                 sctp_add_stream_reset_in(chk, number_entries, list, seq);
12191                 seq++;
12192                 asoc->stream_reset_outstanding++;
12193         }
12194         if (send_tsn_req) {
12195                 sctp_add_stream_reset_tsn(chk, seq);
12196                 asoc->stream_reset_outstanding++;
12197         }
12198         asoc->str_reset = chk;
12199         /* insert the chunk for sending */
12200         TAILQ_INSERT_TAIL(&asoc->control_send_queue,
12201             chk,
12202             sctp_next);
12203         asoc->ctrl_queue_cnt++;
12204         if (stcb->asoc.send_sack) {
12205                 sctp_send_sack(stcb, SCTP_SO_LOCKED);
12206         }
12207         sctp_timer_start(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb, chk->whoTo);
12208         return (0);
12209 }
12210
12211 void
12212 sctp_send_abort(struct mbuf *m, int iphlen, struct sockaddr *src, struct sockaddr *dst,
12213     struct sctphdr *sh, uint32_t vtag, struct mbuf *cause,
12214     uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum,
12215     uint32_t vrf_id, uint16_t port)
12216 {
12217         /* Don't respond to an ABORT with an ABORT. */
12218         if (sctp_is_there_an_abort_here(m, iphlen, &vtag)) {
12219                 if (cause)
12220                         sctp_m_freem(cause);
12221                 return;
12222         }
12223         sctp_send_resp_msg(src, dst, sh, vtag, SCTP_ABORT_ASSOCIATION, cause,
12224             mflowtype, mflowid, fibnum,
12225             vrf_id, port);
12226         return;
12227 }
12228
12229 void
12230 sctp_send_operr_to(struct sockaddr *src, struct sockaddr *dst,
12231     struct sctphdr *sh, uint32_t vtag, struct mbuf *cause,
12232     uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum,
12233     uint32_t vrf_id, uint16_t port)
12234 {
12235         sctp_send_resp_msg(src, dst, sh, vtag, SCTP_OPERATION_ERROR, cause,
12236             mflowtype, mflowid, fibnum,
12237             vrf_id, port);
12238         return;
12239 }
12240
12241 static struct mbuf *
12242 sctp_copy_resume(struct uio *uio,
12243     int max_send_len,
12244     int user_marks_eor,
12245     int *error,
12246     uint32_t *sndout,
12247     struct mbuf **new_tail)
12248 {
12249         struct mbuf *m;
12250
12251         m = m_uiotombuf(uio, M_WAITOK, max_send_len, 0,
12252             (M_PKTHDR | (user_marks_eor ? M_EOR : 0)));
12253         if (m == NULL) {
12254                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOBUFS);
12255                 *error = ENOBUFS;
12256         } else {
12257                 *sndout = m_length(m, NULL);
12258                 *new_tail = m_last(m);
12259         }
12260         return (m);
12261 }
12262
12263 static int
12264 sctp_copy_one(struct sctp_stream_queue_pending *sp,
12265     struct uio *uio,
12266     int resv_upfront)
12267 {
12268         sp->data = m_uiotombuf(uio, M_WAITOK, sp->length,
12269             resv_upfront, 0);
12270         if (sp->data == NULL) {
12271                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOBUFS);
12272                 return (ENOBUFS);
12273         }
12274
12275         sp->tail_mbuf = m_last(sp->data);
12276         return (0);
12277 }
12278
12279 static struct sctp_stream_queue_pending *
12280 sctp_copy_it_in(struct sctp_tcb *stcb,
12281     struct sctp_association *asoc,
12282     struct sctp_sndrcvinfo *srcv,
12283     struct uio *uio,
12284     struct sctp_nets *net,
12285     ssize_t max_send_len,
12286     int user_marks_eor,
12287     int *error)
12288 {
12289
12290         /*-
12291          * This routine must be very careful in its work. Protocol
12292          * processing is up and running so care must be taken to spl...()
12293          * when you need to do something that may effect the stcb/asoc. The
12294          * sb is locked however. When data is copied the protocol processing
12295          * should be enabled since this is a slower operation...
12296          */
12297         struct sctp_stream_queue_pending *sp = NULL;
12298         int resv_in_first;
12299
12300         *error = 0;
12301         /* Now can we send this? */
12302         if ((SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_SENT) ||
12303             (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_ACK_SENT) ||
12304             (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_RECEIVED) ||
12305             (asoc->state & SCTP_STATE_SHUTDOWN_PENDING)) {
12306                 /* got data while shutting down */
12307                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
12308                 *error = ECONNRESET;
12309                 goto out_now;
12310         }
12311         sctp_alloc_a_strmoq(stcb, sp);
12312         if (sp == NULL) {
12313                 SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12314                 *error = ENOMEM;
12315                 goto out_now;
12316         }
12317         sp->act_flags = 0;
12318         sp->sender_all_done = 0;
12319         sp->sinfo_flags = srcv->sinfo_flags;
12320         sp->timetolive = srcv->sinfo_timetolive;
12321         sp->ppid = srcv->sinfo_ppid;
12322         sp->context = srcv->sinfo_context;
12323         sp->fsn = 0;
12324         (void)SCTP_GETTIME_TIMEVAL(&sp->ts);
12325
12326         sp->sid = srcv->sinfo_stream;
12327         sp->length = (uint32_t)min(uio->uio_resid, max_send_len);
12328         if ((sp->length == (uint32_t)uio->uio_resid) &&
12329             ((user_marks_eor == 0) ||
12330             (srcv->sinfo_flags & SCTP_EOF) ||
12331             (user_marks_eor && (srcv->sinfo_flags & SCTP_EOR)))) {
12332                 sp->msg_is_complete = 1;
12333         } else {
12334                 sp->msg_is_complete = 0;
12335         }
12336         sp->sender_all_done = 0;
12337         sp->some_taken = 0;
12338         sp->put_last_out = 0;
12339         resv_in_first = SCTP_DATA_CHUNK_OVERHEAD(stcb);
12340         sp->data = sp->tail_mbuf = NULL;
12341         if (sp->length == 0) {
12342                 goto skip_copy;
12343         }
12344         if (srcv->sinfo_keynumber_valid) {
12345                 sp->auth_keyid = srcv->sinfo_keynumber;
12346         } else {
12347                 sp->auth_keyid = stcb->asoc.authinfo.active_keyid;
12348         }
12349         if (sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks)) {
12350                 sctp_auth_key_acquire(stcb, sp->auth_keyid);
12351                 sp->holds_key_ref = 1;
12352         }
12353         *error = sctp_copy_one(sp, uio, resv_in_first);
12354 skip_copy:
12355         if (*error) {
12356                 sctp_free_a_strmoq(stcb, sp, SCTP_SO_LOCKED);
12357                 sp = NULL;
12358         } else {
12359                 if (sp->sinfo_flags & SCTP_ADDR_OVER) {
12360                         sp->net = net;
12361                         atomic_add_int(&sp->net->ref_count, 1);
12362                 } else {
12363                         sp->net = NULL;
12364                 }
12365                 sctp_set_prsctp_policy(sp);
12366         }
12367 out_now:
12368         return (sp);
12369 }
12370
12371 int
12372 sctp_sosend(struct socket *so,
12373     struct sockaddr *addr,
12374     struct uio *uio,
12375     struct mbuf *top,
12376     struct mbuf *control,
12377     int flags,
12378     struct thread *p
12379 )
12380 {
12381         int error, use_sndinfo = 0;
12382         struct sctp_sndrcvinfo sndrcvninfo;
12383         struct sockaddr *addr_to_use;
12384 #if defined(INET) && defined(INET6)
12385         struct sockaddr_in sin;
12386 #endif
12387
12388         if (control) {
12389                 /* process cmsg snd/rcv info (maybe a assoc-id) */
12390                 if (sctp_find_cmsg(SCTP_SNDRCV, (void *)&sndrcvninfo, control,
12391                     sizeof(sndrcvninfo))) {
12392                         /* got one */
12393                         use_sndinfo = 1;
12394                 }
12395         }
12396         addr_to_use = addr;
12397 #if defined(INET) && defined(INET6)
12398         if ((addr != NULL) && (addr->sa_family == AF_INET6)) {
12399                 struct sockaddr_in6 *sin6;
12400
12401                 if (addr->sa_len != sizeof(struct sockaddr_in6)) {
12402                         SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12403                         return (EINVAL);
12404                 }
12405                 sin6 = (struct sockaddr_in6 *)addr;
12406                 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
12407                         in6_sin6_2_sin(&sin, sin6);
12408                         addr_to_use = (struct sockaddr *)&sin;
12409                 }
12410         }
12411 #endif
12412         error = sctp_lower_sosend(so, addr_to_use, uio, top,
12413             control,
12414             flags,
12415             use_sndinfo ? &sndrcvninfo : NULL
12416             ,p
12417             );
12418         return (error);
12419 }
12420
12421 int
12422 sctp_lower_sosend(struct socket *so,
12423     struct sockaddr *addr,
12424     struct uio *uio,
12425     struct mbuf *top,
12426     struct mbuf *control,
12427     int flags,
12428     struct sctp_sndrcvinfo *srcv
12429     ,
12430     struct thread *p
12431 )
12432 {
12433         struct epoch_tracker et;
12434         ssize_t sndlen = 0, max_len, local_add_more;
12435         int error;
12436         int queue_only = 0, queue_only_for_init = 0;
12437         bool free_cnt_applied = false;
12438         int un_sent;
12439         int now_filled = 0;
12440         unsigned int inqueue_bytes = 0;
12441         struct sctp_block_entry be;
12442         struct sctp_inpcb *inp;
12443         struct sctp_tcb *stcb = NULL;
12444         struct timeval now;
12445         struct sctp_nets *net;
12446         struct sctp_association *asoc;
12447         struct sctp_inpcb *t_inp;
12448         int user_marks_eor;
12449         bool create_lock_applied = false;
12450         int nagle_applies = 0;
12451         bool some_on_control;
12452         bool got_all_of_the_send = false;
12453         bool hold_tcblock = false;
12454         bool non_blocking = false;
12455         ssize_t local_soresv = 0;
12456         uint16_t port;
12457         uint16_t sinfo_flags;
12458         sctp_assoc_t sinfo_assoc_id;
12459
12460         error = 0;
12461         net = NULL;
12462         stcb = NULL;
12463
12464         t_inp = inp = (struct sctp_inpcb *)so->so_pcb;
12465         if (inp == NULL) {
12466                 error = EINVAL;
12467                 goto out_unlocked;
12468         }
12469         if ((uio == NULL) && (top == NULL)) {
12470                 error = EINVAL;
12471                 goto out_unlocked;
12472         }
12473         user_marks_eor = sctp_is_feature_on(inp, SCTP_PCB_FLAGS_EXPLICIT_EOR);
12474         atomic_add_int(&inp->total_sends, 1);
12475         if (uio != NULL) {
12476                 if (uio->uio_resid < 0) {
12477                         error = EINVAL;
12478                         goto out_unlocked;
12479                 }
12480                 sndlen = uio->uio_resid;
12481         } else {
12482                 sndlen = SCTP_HEADER_LEN(top);
12483         }
12484         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Send called addr:%p send length %zd\n",
12485             (void *)addr, sndlen);
12486         if ((inp->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) &&
12487             SCTP_IS_LISTENING(inp)) {
12488                 /* The listener can NOT send. */
12489                 error = EINVAL;
12490                 goto out_unlocked;
12491         }
12492         if (addr != NULL) {
12493                 union sctp_sockstore *raddr = (union sctp_sockstore *)addr;
12494
12495                 switch (raddr->sa.sa_family) {
12496 #ifdef INET
12497                 case AF_INET:
12498                         if (raddr->sin.sin_len != sizeof(struct sockaddr_in)) {
12499                                 error = EINVAL;
12500                                 goto out_unlocked;
12501                         }
12502                         port = raddr->sin.sin_port;
12503                         break;
12504 #endif
12505 #ifdef INET6
12506                 case AF_INET6:
12507                         if (raddr->sin6.sin6_len != sizeof(struct sockaddr_in6)) {
12508                                 error = EINVAL;
12509                                 goto out_unlocked;
12510                         }
12511                         port = raddr->sin6.sin6_port;
12512                         break;
12513 #endif
12514                 default:
12515                         error = EAFNOSUPPORT;
12516                         goto out_unlocked;
12517                 }
12518         } else {
12519                 port = 0;
12520         }
12521
12522         if (srcv != NULL) {
12523                 sinfo_flags = srcv->sinfo_flags;
12524                 sinfo_assoc_id = srcv->sinfo_assoc_id;
12525                 if (INVALID_SINFO_FLAG(sinfo_flags) ||
12526                     PR_SCTP_INVALID_POLICY(sinfo_flags)) {
12527                         error = EINVAL;
12528                         goto out_unlocked;
12529                 }
12530                 if (srcv->sinfo_flags != 0)
12531                         SCTP_STAT_INCR(sctps_sends_with_flags);
12532         } else {
12533                 sinfo_flags = inp->def_send.sinfo_flags;
12534                 sinfo_assoc_id = inp->def_send.sinfo_assoc_id;
12535         }
12536         if (flags & MSG_EOR) {
12537                 sinfo_flags |= SCTP_EOR;
12538         }
12539         if (flags & MSG_EOF) {
12540                 sinfo_flags |= SCTP_EOF;
12541         }
12542         if (sinfo_flags & SCTP_SENDALL) {
12543                 error = sctp_sendall(inp, uio, top, srcv);
12544                 top = NULL;
12545                 goto out_unlocked;
12546         }
12547         if ((sinfo_flags & SCTP_ADDR_OVER) && (addr == NULL)) {
12548                 error = EINVAL;
12549                 goto out_unlocked;
12550         }
12551         /* Now we must find the association. */
12552         SCTP_INP_RLOCK(inp);
12553         if ((inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) ||
12554             (inp->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) {
12555                 stcb = LIST_FIRST(&inp->sctp_asoc_list);
12556                 if (stcb != NULL) {
12557                         SCTP_TCB_LOCK(stcb);
12558                         hold_tcblock = true;
12559                 }
12560                 SCTP_INP_RUNLOCK(inp);
12561         } else if (sinfo_assoc_id > SCTP_ALL_ASSOC) {
12562                 stcb = sctp_findasoc_ep_asocid_locked(inp, sinfo_assoc_id, 1);
12563                 SCTP_INP_RUNLOCK(inp);
12564                 if (stcb != NULL) {
12565                         SCTP_TCB_LOCK_ASSERT(stcb);
12566                         hold_tcblock = true;
12567                 }
12568         } else if (addr != NULL) {
12569                 /*-
12570                  * Since we did not use findep we must
12571                  * increment it, and if we don't find a tcb
12572                  * decrement it.
12573                  */
12574                 SCTP_INP_INCR_REF(inp);
12575                 SCTP_INP_RUNLOCK(inp);
12576                 stcb = sctp_findassociation_ep_addr(&t_inp, addr, &net, NULL, NULL);
12577                 if (stcb == NULL) {
12578                         SCTP_INP_WLOCK(inp);
12579                         SCTP_INP_DECR_REF(inp);
12580                         SCTP_INP_WUNLOCK(inp);
12581                 } else {
12582                         SCTP_TCB_LOCK_ASSERT(stcb);
12583                         hold_tcblock = true;
12584                 }
12585         } else {
12586                 SCTP_INP_RUNLOCK(inp);
12587         }
12588
12589 #ifdef INVARIANTS
12590         if (stcb != NULL) {
12591                 SCTP_TCB_LOCK_ASSERT(stcb);
12592                 KASSERT(hold_tcblock, ("tcb lock hold, hold_tcblock is false"));
12593         } else {
12594                 KASSERT(!hold_tcblock, ("hold_tcblock is true, but stcb is NULL"));
12595         }
12596 #endif
12597         if ((stcb == NULL) && (addr != NULL)) {
12598                 /* Possible implicit send? */
12599                 SCTP_ASOC_CREATE_LOCK(inp);
12600                 create_lock_applied = true;
12601                 if ((inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) ||
12602                     (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE)) {
12603                         error = EINVAL;
12604                         goto out_unlocked;
12605                 }
12606                 if (((inp->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) == 0) &&
12607                     (addr->sa_family == AF_INET6)) {
12608                         error = EINVAL;
12609                         goto out_unlocked;
12610                 }
12611                 SCTP_INP_WLOCK(inp);
12612                 SCTP_INP_INCR_REF(inp);
12613                 SCTP_INP_WUNLOCK(inp);
12614                 /* With the lock applied look again */
12615                 stcb = sctp_findassociation_ep_addr(&t_inp, addr, &net, NULL, NULL);
12616 #if defined(INET) || defined(INET6)
12617                 if ((stcb == NULL) && (control != NULL) && (port > 0)) {
12618                         stcb = sctp_findassociation_cmsgs(&t_inp, port, control, &net, &error);
12619                 }
12620 #endif
12621                 if (stcb == NULL) {
12622                         SCTP_INP_WLOCK(inp);
12623                         SCTP_INP_DECR_REF(inp);
12624                         SCTP_INP_WUNLOCK(inp);
12625                 } else {
12626                         SCTP_TCB_LOCK_ASSERT(stcb);
12627                         hold_tcblock = true;
12628                         SCTP_ASOC_CREATE_UNLOCK(inp);
12629                         create_lock_applied = false;
12630                 }
12631                 if (error != 0) {
12632                         goto out_unlocked;
12633                 }
12634                 if (t_inp != inp) {
12635                         error = ENOTCONN;
12636                         goto out_unlocked;
12637                 }
12638         }
12639         if (stcb == NULL) {
12640                 if (addr == NULL) {
12641                         error = ENOENT;
12642                         goto out_unlocked;
12643                 } else {
12644                         /* We must go ahead and start the INIT process */
12645                         uint32_t vrf_id;
12646
12647                         if ((sinfo_flags & SCTP_ABORT) ||
12648                             ((sinfo_flags & SCTP_EOF) && (sndlen == 0))) {
12649                                 /*-
12650                                  * User asks to abort a non-existent assoc,
12651                                  * or EOF a non-existent assoc with no data
12652                                  */
12653                                 error = ENOENT;
12654                                 goto out_unlocked;
12655                         }
12656                         /* get an asoc/stcb struct */
12657                         vrf_id = inp->def_vrf_id;
12658                         KASSERT(create_lock_applied, ("create_lock_applied is false"));
12659                         stcb = sctp_aloc_assoc_connected(inp, addr, &error, 0, 0, vrf_id,
12660                             inp->sctp_ep.pre_open_stream_count,
12661                             inp->sctp_ep.port,
12662                             p,
12663                             SCTP_INITIALIZE_AUTH_PARAMS);
12664                         if (stcb == NULL) {
12665                                 /* error is setup for us in the call. */
12666                                 KASSERT(error != 0, ("error is 0 although stcb is NULL"));
12667                                 goto out_unlocked;
12668                         }
12669                         SCTP_TCB_LOCK_ASSERT(stcb);
12670                         hold_tcblock = true;
12671                         SCTP_ASOC_CREATE_UNLOCK(inp);
12672                         create_lock_applied = false;
12673                         /*
12674                          * Turn on queue only flag to prevent data from
12675                          * being sent
12676                          */
12677                         queue_only = 1;
12678                         SCTP_SET_STATE(stcb, SCTP_STATE_COOKIE_WAIT);
12679                         (void)SCTP_GETTIME_TIMEVAL(&stcb->asoc.time_entered);
12680                         if (control != NULL) {
12681                                 if (sctp_process_cmsgs_for_init(stcb, control, &error)) {
12682                                         sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
12683                                             SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_6);
12684                                         hold_tcblock = false;
12685                                         stcb = NULL;
12686                                         KASSERT(error != 0,
12687                                             ("error is 0 although sctp_process_cmsgs_for_init() indicated an error"));
12688                                         goto out_unlocked;
12689                                 }
12690                         }
12691                         /* out with the INIT */
12692                         queue_only_for_init = 1;
12693                         /*-
12694                          * we may want to dig in after this call and adjust the MTU
12695                          * value. It defaulted to 1500 (constant) but the ro
12696                          * structure may now have an update and thus we may need to
12697                          * change it BEFORE we append the message.
12698                          */
12699                 }
12700         }
12701
12702         KASSERT(!create_lock_applied, ("create_lock_applied is true"));
12703         KASSERT(stcb != NULL, ("stcb is NULL"));
12704         KASSERT(hold_tcblock, ("hold_tcblock is false"));
12705         SCTP_TCB_LOCK_ASSERT(stcb);
12706         asoc = &stcb->asoc;
12707         if ((asoc->state & SCTP_STATE_ABOUT_TO_BE_FREED) ||
12708             (asoc->state & SCTP_STATE_WAS_ABORTED)) {
12709                 if (asoc->state & SCTP_STATE_WAS_ABORTED) {
12710                         /* XXX: Could also be ECONNABORTED, not enough info. */
12711                         error = ECONNRESET;
12712                 } else {
12713                         error = ENOTCONN;
12714                 }
12715                 goto out_unlocked;
12716         }
12717         /* Keep the stcb from being freed under our feet. */
12718         atomic_add_int(&asoc->refcnt, 1);
12719         free_cnt_applied = true;
12720
12721         if (srcv == NULL) {
12722                 srcv = (struct sctp_sndrcvinfo *)&asoc->def_send;
12723                 sinfo_flags = srcv->sinfo_flags;
12724                 if (flags & MSG_EOR) {
12725                         sinfo_flags |= SCTP_EOR;
12726                 }
12727                 if (flags & MSG_EOF) {
12728                         sinfo_flags |= SCTP_EOF;
12729                 }
12730         }
12731         if (sinfo_flags & SCTP_ADDR_OVER) {
12732                 if (addr != NULL)
12733                         net = sctp_findnet(stcb, addr);
12734                 else
12735                         net = NULL;
12736                 if ((net == NULL) ||
12737                     ((port != 0) && (port != stcb->rport))) {
12738                         error = EINVAL;
12739                         goto out_unlocked;
12740                 }
12741         } else {
12742                 if (asoc->alternate != NULL) {
12743                         net = asoc->alternate;
12744                 } else {
12745                         net = asoc->primary_destination;
12746                 }
12747         }
12748         atomic_add_int(&stcb->total_sends, 1);
12749
12750         if (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_NO_FRAGMENT)) {
12751                 if (sndlen > (ssize_t)asoc->smallest_mtu) {
12752                         error = EMSGSIZE;
12753                         goto out_unlocked;
12754                 }
12755         }
12756         if (SCTP_SO_IS_NBIO(so)
12757             || (flags & (MSG_NBIO | MSG_DONTWAIT)) != 0
12758             ) {
12759                 non_blocking = true;
12760         }
12761         /* would we block? */
12762         if (non_blocking) {
12763                 ssize_t amount;
12764
12765                 inqueue_bytes = asoc->total_output_queue_size - (asoc->chunks_on_out_queue * SCTP_DATA_CHUNK_OVERHEAD(stcb));
12766                 if (user_marks_eor == 0) {
12767                         amount = sndlen;
12768                 } else {
12769                         amount = 1;
12770                 }
12771                 if ((SCTP_SB_LIMIT_SND(so) < (amount + inqueue_bytes + asoc->sb_send_resv)) ||
12772                     (asoc->chunks_on_out_queue >= SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue))) {
12773                         if ((sndlen > (ssize_t)SCTP_SB_LIMIT_SND(so)) &&
12774                             (user_marks_eor == 0)) {
12775                                 error = EMSGSIZE;
12776                         } else {
12777                                 error = EWOULDBLOCK;
12778                         }
12779                         goto out_unlocked;
12780                 }
12781                 asoc->sb_send_resv += (uint32_t)sndlen;
12782         } else {
12783                 atomic_add_int(&asoc->sb_send_resv, (int)sndlen);
12784         }
12785         local_soresv = sndlen;
12786         /* Is the stream no. valid? */
12787         if (srcv->sinfo_stream >= asoc->streamoutcnt) {
12788                 /* Invalid stream number */
12789                 error = EINVAL;
12790                 goto out_unlocked;
12791         }
12792         if ((asoc->strmout[srcv->sinfo_stream].state != SCTP_STREAM_OPEN) &&
12793             (asoc->strmout[srcv->sinfo_stream].state != SCTP_STREAM_OPENING)) {
12794                 /*
12795                  * Can't queue any data while stream reset is underway.
12796                  */
12797                 if (asoc->strmout[srcv->sinfo_stream].state > SCTP_STREAM_OPEN) {
12798                         error = EAGAIN;
12799                 } else {
12800                         error = EINVAL;
12801                 }
12802                 goto out_unlocked;
12803         }
12804         if ((SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_WAIT) ||
12805             (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)) {
12806                 queue_only = 1;
12807         }
12808         if ((SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_SENT) ||
12809             (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_RECEIVED) ||
12810             (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_ACK_SENT) ||
12811             (asoc->state & SCTP_STATE_SHUTDOWN_PENDING)) {
12812                 if ((sinfo_flags & SCTP_ABORT) == 0) {
12813                         error = EPIPE;
12814                         goto out_unlocked;
12815                 }
12816         }
12817         /* Ok, we will attempt a msgsnd :> */
12818         if (p != NULL) {
12819                 p->td_ru.ru_msgsnd++;
12820         }
12821
12822         KASSERT(stcb != NULL, ("stcb is NULL"));
12823         KASSERT(hold_tcblock, ("hold_tcblock is false"));
12824         SCTP_TCB_LOCK_ASSERT(stcb);
12825         KASSERT((asoc->state & SCTP_STATE_ABOUT_TO_BE_FREED) == 0,
12826             ("Association about to be freed"));
12827         KASSERT((asoc->state & SCTP_STATE_WAS_ABORTED) == 0,
12828             ("Association was aborted"));
12829
12830         /* Are we aborting? */
12831         if (sinfo_flags & SCTP_ABORT) {
12832                 struct mbuf *mm;
12833                 struct sctp_paramhdr *ph;
12834                 ssize_t tot_demand, tot_out = 0, max_out;
12835
12836                 SCTP_STAT_INCR(sctps_sends_with_abort);
12837                 if ((SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_WAIT) ||
12838                     (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)) {
12839                         /* It has to be up before we abort. */
12840                         error = EINVAL;
12841                         goto out;
12842                 }
12843                 /* How big is the user initiated abort? */
12844                 if (top != NULL) {
12845                         struct mbuf *cntm;
12846
12847                         if (sndlen != 0) {
12848                                 for (cntm = top; cntm; cntm = SCTP_BUF_NEXT(cntm)) {
12849                                         tot_out += SCTP_BUF_LEN(cntm);
12850                                 }
12851                         }
12852                         mm = sctp_get_mbuf_for_msg(sizeof(struct sctp_paramhdr), 0, M_NOWAIT, 1, MT_DATA);
12853                 } else {
12854                         /* Must fit in a MTU */
12855                         tot_out = sndlen;
12856                         tot_demand = (tot_out + sizeof(struct sctp_paramhdr));
12857                         if (tot_demand > SCTP_DEFAULT_ADD_MORE) {
12858                                 error = EMSGSIZE;
12859                                 goto out_unlocked;
12860                         }
12861                         mm = sctp_get_mbuf_for_msg((unsigned int)tot_demand, 0, M_NOWAIT, 1, MT_DATA);
12862                 }
12863                 if (mm == NULL) {
12864                         error = ENOMEM;
12865                         goto out_unlocked;
12866                 }
12867                 max_out = asoc->smallest_mtu - sizeof(struct sctp_paramhdr);
12868                 max_out -= sizeof(struct sctp_abort_msg);
12869                 if (tot_out > max_out) {
12870                         tot_out = max_out;
12871                 }
12872                 ph = mtod(mm, struct sctp_paramhdr *);
12873                 ph->param_type = htons(SCTP_CAUSE_USER_INITIATED_ABT);
12874                 ph->param_length = htons((uint16_t)(sizeof(struct sctp_paramhdr) + tot_out));
12875                 ph++;
12876                 SCTP_BUF_LEN(mm) = (int)(tot_out + sizeof(struct sctp_paramhdr));
12877                 if (top == NULL) {
12878                         SCTP_TCB_UNLOCK(stcb);
12879                         hold_tcblock = false;
12880                         error = uiomove((caddr_t)ph, (int)tot_out, uio);
12881                         SCTP_TCB_LOCK(stcb);
12882                         hold_tcblock = true;
12883                         if ((asoc->state & SCTP_STATE_ABOUT_TO_BE_FREED) ||
12884                             (asoc->state & SCTP_STATE_WAS_ABORTED)) {
12885                                 sctp_m_freem(mm);
12886                                 if (asoc->state & SCTP_STATE_WAS_ABORTED) {
12887                                         /*
12888                                          * XXX: Could also be ECONNABORTED,
12889                                          * not enough info.
12890                                          */
12891                                         error = ECONNRESET;
12892                                 } else {
12893                                         error = ENOTCONN;
12894                                 }
12895                                 goto out_unlocked;
12896                         }
12897                         if (error != 0) {
12898                                 /*-
12899                                  * Here if we can't get his data we
12900                                  * still abort we just don't get to
12901                                  * send the users note :-0
12902                                  */
12903                                 sctp_m_freem(mm);
12904                                 mm = NULL;
12905                                 error = 0;
12906                         }
12907                 } else {
12908                         if (sndlen != 0) {
12909                                 SCTP_BUF_NEXT(mm) = top;
12910                         }
12911                 }
12912                 atomic_subtract_int(&asoc->refcnt, 1);
12913                 free_cnt_applied = false;
12914                 /* release this lock, otherwise we hang on ourselves */
12915                 NET_EPOCH_ENTER(et);
12916                 sctp_abort_an_association(stcb->sctp_ep, stcb, mm, false, SCTP_SO_LOCKED);
12917                 NET_EPOCH_EXIT(et);
12918                 stcb = NULL;
12919                 /*
12920                  * In this case top is already chained to mm avoid double
12921                  * free, since we free it below if top != NULL and driver
12922                  * would free it after sending the packet out
12923                  */
12924                 if (sndlen != 0) {
12925                         top = NULL;
12926                 }
12927                 goto out_unlocked;
12928         }
12929
12930         KASSERT(stcb != NULL, ("stcb is NULL"));
12931         KASSERT(hold_tcblock, ("hold_tcblock is false"));
12932         SCTP_TCB_LOCK_ASSERT(stcb);
12933         KASSERT((asoc->state & SCTP_STATE_ABOUT_TO_BE_FREED) == 0,
12934             ("Association about to be freed"));
12935         KASSERT((asoc->state & SCTP_STATE_WAS_ABORTED) == 0,
12936             ("Association was aborted"));
12937
12938         /* Calculate the maximum we can send */
12939         inqueue_bytes = asoc->total_output_queue_size - (asoc->chunks_on_out_queue * SCTP_DATA_CHUNK_OVERHEAD(stcb));
12940         if (SCTP_SB_LIMIT_SND(so) > inqueue_bytes) {
12941                 max_len = SCTP_SB_LIMIT_SND(so) - inqueue_bytes;
12942         } else {
12943                 max_len = 0;
12944         }
12945         /* Unless E_EOR mode is on, we must make a send FIT in one call. */
12946         if ((user_marks_eor == 0) &&
12947             (sndlen > (ssize_t)SCTP_SB_LIMIT_SND(stcb->sctp_socket))) {
12948                 /* It will NEVER fit. */
12949                 error = EMSGSIZE;
12950                 goto out_unlocked;
12951         }
12952         if ((uio == NULL) && (user_marks_eor != 0)) {
12953                 /*-
12954                  * We do not support eeor mode for
12955                  * sending with mbuf chains (like sendfile).
12956                  */
12957                 error = EINVAL;
12958                 goto out_unlocked;
12959         }
12960
12961         if (user_marks_eor != 0) {
12962                 local_add_more = (ssize_t)min(SCTP_SB_LIMIT_SND(so), SCTP_BASE_SYSCTL(sctp_add_more_threshold));
12963         } else {
12964                 /*-
12965                  * For non-eeor the whole message must fit in
12966                  * the socket send buffer.
12967                  */
12968                 local_add_more = sndlen;
12969         }
12970         if (non_blocking) {
12971                 goto skip_preblock;
12972         }
12973         if (((max_len <= local_add_more) && ((ssize_t)SCTP_SB_LIMIT_SND(so) >= local_add_more)) ||
12974             (max_len == 0) ||
12975             ((asoc->chunks_on_out_queue + asoc->stream_queue_cnt) >= SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue))) {
12976                 /* No room right now! */
12977                 inqueue_bytes = asoc->total_output_queue_size - (asoc->chunks_on_out_queue * SCTP_DATA_CHUNK_OVERHEAD(stcb));
12978                 SOCKBUF_LOCK(&so->so_snd);
12979                 while ((SCTP_SB_LIMIT_SND(so) < (inqueue_bytes + local_add_more)) ||
12980                     ((asoc->stream_queue_cnt + asoc->chunks_on_out_queue) >= SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue))) {
12981                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "pre_block limit:%u <(inq:%d + %zd) || (%d+%d > %d)\n",
12982                             (unsigned int)SCTP_SB_LIMIT_SND(so),
12983                             inqueue_bytes,
12984                             local_add_more,
12985                             asoc->stream_queue_cnt,
12986                             asoc->chunks_on_out_queue,
12987                             SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue));
12988                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
12989                                 sctp_log_block(SCTP_BLOCK_LOG_INTO_BLKA, asoc, sndlen);
12990                         }
12991                         be.error = 0;
12992                         stcb->block_entry = &be;
12993                         SCTP_TCB_UNLOCK(stcb);
12994                         hold_tcblock = false;
12995                         error = sbwait(&so->so_snd);
12996                         if (error == 0) {
12997                                 if (so->so_error != 0) {
12998                                         error = so->so_error;
12999                                 }
13000                                 if (be.error != 0) {
13001                                         error = be.error;
13002                                 }
13003                         }
13004                         SOCKBUF_UNLOCK(&so->so_snd);
13005                         SCTP_TCB_LOCK(stcb);
13006                         hold_tcblock = true;
13007                         stcb->block_entry = NULL;
13008                         if (error != 0) {
13009                                 goto out_unlocked;
13010                         }
13011                         if ((asoc->state & SCTP_STATE_ABOUT_TO_BE_FREED) ||
13012                             (asoc->state & SCTP_STATE_WAS_ABORTED)) {
13013                                 if (asoc->state & SCTP_STATE_WAS_ABORTED) {
13014                                         /*
13015                                          * XXX: Could also be ECONNABORTED,
13016                                          * not enough info.
13017                                          */
13018                                         error = ECONNRESET;
13019                                 } else {
13020                                         error = ENOTCONN;
13021                                 }
13022                                 goto out_unlocked;
13023                         }
13024                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13025                                 sctp_log_block(SCTP_BLOCK_LOG_OUTOF_BLK,
13026                                     asoc, asoc->total_output_queue_size);
13027                         }
13028                         inqueue_bytes = asoc->total_output_queue_size - (asoc->chunks_on_out_queue * SCTP_DATA_CHUNK_OVERHEAD(stcb));
13029                         SOCKBUF_LOCK(&so->so_snd);
13030                 }
13031                 if (SCTP_SB_LIMIT_SND(so) > inqueue_bytes) {
13032                         max_len = SCTP_SB_LIMIT_SND(so) - inqueue_bytes;
13033                 } else {
13034                         max_len = 0;
13035                 }
13036                 SOCKBUF_UNLOCK(&so->so_snd);
13037         }
13038
13039 skip_preblock:
13040         KASSERT(stcb != NULL, ("stcb is NULL"));
13041         KASSERT(hold_tcblock, ("hold_tcblock is false"));
13042         SCTP_TCB_LOCK_ASSERT(stcb);
13043         KASSERT((asoc->state & SCTP_STATE_ABOUT_TO_BE_FREED) == 0,
13044             ("Association about to be freed"));
13045         KASSERT((asoc->state & SCTP_STATE_WAS_ABORTED) == 0,
13046             ("Association was aborted"));
13047
13048         /*
13049          * sndlen covers for mbuf case uio_resid covers for the non-mbuf
13050          * case NOTE: uio will be null when top/mbuf is passed
13051          */
13052         if (sndlen == 0) {
13053                 if (sinfo_flags & SCTP_EOF) {
13054                         got_all_of_the_send = true;
13055                         goto dataless_eof;
13056                 } else {
13057                         error = EINVAL;
13058                         goto out;
13059                 }
13060         }
13061
13062         if (top == NULL) {
13063                 struct sctp_stream_queue_pending *sp;
13064                 struct sctp_stream_out *strm;
13065                 uint32_t sndout;
13066
13067                 if ((asoc->stream_locked) &&
13068                     (asoc->stream_locked_on != srcv->sinfo_stream)) {
13069                         error = EINVAL;
13070                         goto out;
13071                 }
13072                 strm = &asoc->strmout[srcv->sinfo_stream];
13073                 if (strm->last_msg_incomplete == 0) {
13074         do_a_copy_in:
13075                         SCTP_TCB_UNLOCK(stcb);
13076                         hold_tcblock = false;
13077                         sp = sctp_copy_it_in(stcb, asoc, srcv, uio, net, max_len, user_marks_eor, &error);
13078                         SCTP_TCB_LOCK(stcb);
13079                         hold_tcblock = true;
13080                         if ((asoc->state & SCTP_STATE_ABOUT_TO_BE_FREED) ||
13081                             (asoc->state & SCTP_STATE_WAS_ABORTED)) {
13082                                 if (asoc->state & SCTP_STATE_WAS_ABORTED) {
13083                                         /*
13084                                          * XXX: Could also be ECONNABORTED,
13085                                          * not enough info.
13086                                          */
13087                                         error = ECONNRESET;
13088                                 } else {
13089                                         error = ENOTCONN;
13090                                 }
13091                                 goto out;
13092                         }
13093                         if (error != 0) {
13094                                 goto out;
13095                         }
13096                         /* The out streams might be reallocated. */
13097                         strm = &asoc->strmout[srcv->sinfo_stream];
13098                         if (sp->msg_is_complete) {
13099                                 strm->last_msg_incomplete = 0;
13100                                 asoc->stream_locked = 0;
13101                         } else {
13102                                 /*
13103                                  * Just got locked to this guy in case of an
13104                                  * interrupt.
13105                                  */
13106                                 strm->last_msg_incomplete = 1;
13107                                 if (asoc->idata_supported == 0) {
13108                                         asoc->stream_locked = 1;
13109                                         asoc->stream_locked_on = srcv->sinfo_stream;
13110                                 }
13111                                 sp->sender_all_done = 0;
13112                         }
13113                         sctp_snd_sb_alloc(stcb, sp->length);
13114                         atomic_add_int(&asoc->stream_queue_cnt, 1);
13115                         if (sinfo_flags & SCTP_UNORDERED) {
13116                                 SCTP_STAT_INCR(sctps_sends_with_unord);
13117                         }
13118                         sp->processing = 1;
13119                         TAILQ_INSERT_TAIL(&strm->outqueue, sp, next);
13120                         asoc->ss_functions.sctp_ss_add_to_stream(stcb, asoc, strm, sp);
13121                 } else {
13122                         sp = TAILQ_LAST(&strm->outqueue, sctp_streamhead);
13123                         if (sp == NULL) {
13124                                 /* ???? Huh ??? last msg is gone */
13125 #ifdef INVARIANTS
13126                                 panic("Warning: Last msg marked incomplete, yet nothing left?");
13127 #else
13128                                 SCTP_PRINTF("Warning: Last msg marked incomplete, yet nothing left?\n");
13129                                 strm->last_msg_incomplete = 0;
13130 #endif
13131                                 goto do_a_copy_in;
13132                         }
13133                         if (sp->processing != 0) {
13134                                 error = EINVAL;
13135                                 goto out;
13136                         } else {
13137                                 sp->processing = 1;
13138                         }
13139                 }
13140
13141                 KASSERT(stcb != NULL, ("stcb is NULL"));
13142                 KASSERT(hold_tcblock, ("hold_tcblock is false"));
13143                 SCTP_TCB_LOCK_ASSERT(stcb);
13144                 KASSERT((asoc->state & SCTP_STATE_ABOUT_TO_BE_FREED) == 0,
13145                     ("Association about to be freed"));
13146                 KASSERT((asoc->state & SCTP_STATE_WAS_ABORTED) == 0,
13147                     ("Association was aborted"));
13148
13149                 while (uio->uio_resid > 0) {
13150                         /* How much room do we have? */
13151                         struct mbuf *new_tail, *mm;
13152
13153                         inqueue_bytes = asoc->total_output_queue_size - (asoc->chunks_on_out_queue * SCTP_DATA_CHUNK_OVERHEAD(stcb));
13154                         if (SCTP_SB_LIMIT_SND(so) > inqueue_bytes) {
13155                                 max_len = SCTP_SB_LIMIT_SND(so) - inqueue_bytes;
13156                         } else {
13157                                 max_len = 0;
13158                         }
13159                         if ((max_len > (ssize_t)SCTP_BASE_SYSCTL(sctp_add_more_threshold)) ||
13160                             ((max_len > 0) && (SCTP_SB_LIMIT_SND(so) < SCTP_BASE_SYSCTL(sctp_add_more_threshold))) ||
13161                             (uio->uio_resid <= max_len)) {
13162                                 SCTP_TCB_UNLOCK(stcb);
13163                                 hold_tcblock = false;
13164                                 sndout = 0;
13165                                 new_tail = NULL;
13166                                 mm = sctp_copy_resume(uio, (int)max_len, user_marks_eor, &error, &sndout, &new_tail);
13167                                 SCTP_TCB_LOCK(stcb);
13168                                 hold_tcblock = true;
13169                                 if ((asoc->state & SCTP_STATE_ABOUT_TO_BE_FREED) ||
13170                                     (asoc->state & SCTP_STATE_WAS_ABORTED)) {
13171                                         /*
13172                                          * We need to get out. Peer probably
13173                                          * aborted.
13174                                          */
13175                                         sctp_m_freem(mm);
13176                                         if (asoc->state & SCTP_STATE_WAS_ABORTED) {
13177                                                 /*
13178                                                  * XXX: Could also be
13179                                                  * ECONNABORTED, not enough
13180                                                  * info.
13181                                                  */
13182                                                 error = ECONNRESET;
13183                                         } else {
13184                                                 error = ENOTCONN;
13185                                         }
13186                                         goto out;
13187                                 }
13188                                 if ((mm == NULL) || (error != 0)) {
13189                                         if (mm != NULL) {
13190                                                 sctp_m_freem(mm);
13191                                         }
13192                                         if (sp != NULL) {
13193                                                 sp->processing = 0;
13194                                         }
13195                                         goto out;
13196                                 }
13197                                 /* Update the mbuf and count */
13198                                 if (sp->tail_mbuf != NULL) {
13199                                         /* Tack it to the end. */
13200                                         SCTP_BUF_NEXT(sp->tail_mbuf) = mm;
13201                                 } else {
13202                                         /* A stolen mbuf. */
13203                                         sp->data = mm;
13204                                 }
13205                                 sp->tail_mbuf = new_tail;
13206                                 sctp_snd_sb_alloc(stcb, sndout);
13207                                 atomic_add_int(&sp->length, sndout);
13208                                 if (sinfo_flags & SCTP_SACK_IMMEDIATELY) {
13209                                         sp->sinfo_flags |= SCTP_SACK_IMMEDIATELY;
13210                                 }
13211
13212                                 /* Did we reach EOR? */
13213                                 if ((uio->uio_resid == 0) &&
13214                                     ((user_marks_eor == 0) ||
13215                                     (sinfo_flags & SCTP_EOF) ||
13216                                     (user_marks_eor && (sinfo_flags & SCTP_EOR)))) {
13217                                         sp->msg_is_complete = 1;
13218                                 } else {
13219                                         sp->msg_is_complete = 0;
13220                                 }
13221                         }
13222
13223                         KASSERT(stcb != NULL, ("stcb is NULL"));
13224                         KASSERT(hold_tcblock, ("hold_tcblock is false"));
13225                         SCTP_TCB_LOCK_ASSERT(stcb);
13226                         KASSERT((asoc->state & SCTP_STATE_ABOUT_TO_BE_FREED) == 0,
13227                             ("Association about to be freed"));
13228                         KASSERT((asoc->state & SCTP_STATE_WAS_ABORTED) == 0,
13229                             ("Association was aborted"));
13230
13231                         if (uio->uio_resid == 0) {
13232                                 /* got it all? */
13233                                 continue;
13234                         }
13235                         /* PR-SCTP? */
13236                         if ((asoc->prsctp_supported) && (asoc->sent_queue_cnt_removeable > 0)) {
13237                                 /*
13238                                  * This is ugly but we must assure locking
13239                                  * order
13240                                  */
13241                                 sctp_prune_prsctp(stcb, asoc, srcv, (int)sndlen);
13242                                 inqueue_bytes = asoc->total_output_queue_size - (asoc->chunks_on_out_queue * SCTP_DATA_CHUNK_OVERHEAD(stcb));
13243                                 if (SCTP_SB_LIMIT_SND(so) > inqueue_bytes)
13244                                         max_len = SCTP_SB_LIMIT_SND(so) - inqueue_bytes;
13245                                 else
13246                                         max_len = 0;
13247                                 if (max_len > 0) {
13248                                         continue;
13249                                 }
13250                         }
13251                         /* wait for space now */
13252                         if (non_blocking) {
13253                                 /* Non-blocking io in place out */
13254                                 if (sp != NULL) {
13255                                         sp->processing = 0;
13256                                 }
13257                                 goto skip_out_eof;
13258                         }
13259                         /* What about the INIT, send it maybe */
13260                         if (queue_only_for_init) {
13261                                 if (SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) {
13262                                         /* a collision took us forward? */
13263                                         queue_only = 0;
13264                                 } else {
13265                                         NET_EPOCH_ENTER(et);
13266                                         sctp_send_initiate(inp, stcb, SCTP_SO_LOCKED);
13267                                         NET_EPOCH_EXIT(et);
13268                                         SCTP_SET_STATE(stcb, SCTP_STATE_COOKIE_WAIT);
13269                                         queue_only = 1;
13270                                 }
13271                         }
13272                         if ((net->flight_size > net->cwnd) &&
13273                             (asoc->sctp_cmt_on_off == 0)) {
13274                                 SCTP_STAT_INCR(sctps_send_cwnd_avoid);
13275                                 queue_only = 1;
13276                         } else if (asoc->ifp_had_enobuf) {
13277                                 SCTP_STAT_INCR(sctps_ifnomemqueued);
13278                                 if (net->flight_size > (2 * net->mtu)) {
13279                                         queue_only = 1;
13280                                 }
13281                                 asoc->ifp_had_enobuf = 0;
13282                         }
13283                         un_sent = asoc->total_output_queue_size - asoc->total_flight;
13284                         if ((sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY)) &&
13285                             (asoc->total_flight > 0) &&
13286                             (asoc->stream_queue_cnt < SCTP_MAX_DATA_BUNDLING) &&
13287                             (un_sent < (int)(asoc->smallest_mtu - SCTP_MIN_OVERHEAD))) {
13288                                 /*-
13289                                  * Ok, Nagle is set on and we have data outstanding.
13290                                  * Don't send anything and let SACKs drive out the
13291                                  * data unless we have a "full" segment to send.
13292                                  */
13293                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
13294                                         sctp_log_nagle_event(stcb, SCTP_NAGLE_APPLIED);
13295                                 }
13296                                 SCTP_STAT_INCR(sctps_naglequeued);
13297                                 nagle_applies = 1;
13298                         } else {
13299                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
13300                                         if (sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY))
13301                                                 sctp_log_nagle_event(stcb, SCTP_NAGLE_SKIPPED);
13302                                 }
13303                                 SCTP_STAT_INCR(sctps_naglesent);
13304                                 nagle_applies = 0;
13305                         }
13306                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13307                                 sctp_misc_ints(SCTP_CWNDLOG_PRESEND, queue_only_for_init, queue_only,
13308                                     nagle_applies, un_sent);
13309                                 sctp_misc_ints(SCTP_CWNDLOG_PRESEND, asoc->total_output_queue_size,
13310                                     asoc->total_flight,
13311                                     asoc->chunks_on_out_queue, asoc->total_flight_count);
13312                         }
13313                         if (queue_only_for_init) {
13314                                 queue_only_for_init = 0;
13315                         }
13316                         if ((queue_only == 0) && (nagle_applies == 0)) {
13317                                 /*-
13318                                  * need to start chunk output
13319                                  * before blocking.. note that if
13320                                  * a lock is already applied, then
13321                                  * the input via the net is happening
13322                                  * and I don't need to start output :-D
13323                                  */
13324                                 NET_EPOCH_ENTER(et);
13325                                 sctp_chunk_output(inp, stcb,
13326                                     SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13327                                 NET_EPOCH_EXIT(et);
13328                         }
13329                         /*-
13330                          * This is a bit strange, but I think it will
13331                          * work. The total_output_queue_size is locked and
13332                          * protected by the TCB_LOCK, which we just released.
13333                          * There is a race that can occur between releasing it
13334                          * above, and me getting the socket lock, where sacks
13335                          * come in but we have not put the SB_WAIT on the
13336                          * so_snd buffer to get the wakeup. After the LOCK
13337                          * is applied the sack_processing will also need to
13338                          * LOCK the so->so_snd to do the actual sowwakeup(). So
13339                          * once we have the socket buffer lock if we recheck the
13340                          * size we KNOW we will get to sleep safely with the
13341                          * wakeup flag in place.
13342                          */
13343                         inqueue_bytes = asoc->total_output_queue_size - (asoc->chunks_on_out_queue * SCTP_DATA_CHUNK_OVERHEAD(stcb));
13344                         SOCKBUF_LOCK(&so->so_snd);
13345                         if (SCTP_SB_LIMIT_SND(so) <= (inqueue_bytes +
13346                             min(SCTP_BASE_SYSCTL(sctp_add_more_threshold), SCTP_SB_LIMIT_SND(so)))) {
13347                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13348                                         sctp_log_block(SCTP_BLOCK_LOG_INTO_BLK,
13349                                             asoc, uio->uio_resid);
13350                                 }
13351                                 be.error = 0;
13352                                 stcb->block_entry = &be;
13353                                 SCTP_TCB_UNLOCK(stcb);
13354                                 hold_tcblock = false;
13355                                 error = sbwait(&so->so_snd);
13356                                 if (error == 0) {
13357                                         if (so->so_error != 0)
13358                                                 error = so->so_error;
13359                                         if (be.error != 0) {
13360                                                 error = be.error;
13361                                         }
13362                                 }
13363                                 SOCKBUF_UNLOCK(&so->so_snd);
13364                                 SCTP_TCB_LOCK(stcb);
13365                                 hold_tcblock = true;
13366                                 stcb->block_entry = NULL;
13367                                 if ((asoc->state & SCTP_STATE_ABOUT_TO_BE_FREED) ||
13368                                     (asoc->state & SCTP_STATE_WAS_ABORTED)) {
13369                                         if (asoc->state & SCTP_STATE_WAS_ABORTED) {
13370                                                 /*
13371                                                  * XXX: Could also be
13372                                                  * ECONNABORTED, not enough
13373                                                  * info.
13374                                                  */
13375                                                 error = ECONNRESET;
13376                                         } else {
13377                                                 error = ENOTCONN;
13378                                         }
13379                                         goto out_unlocked;
13380                                 }
13381                                 if (error != 0) {
13382                                         if (sp != NULL) {
13383                                                 sp->processing = 0;
13384                                         }
13385                                         goto out_unlocked;
13386                                 }
13387                         } else {
13388                                 SOCKBUF_UNLOCK(&so->so_snd);
13389                         }
13390                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13391                                 sctp_log_block(SCTP_BLOCK_LOG_OUTOF_BLK,
13392                                     asoc, asoc->total_output_queue_size);
13393                         }
13394                 }
13395
13396                 KASSERT(stcb != NULL, ("stcb is NULL"));
13397                 KASSERT(hold_tcblock, ("hold_tcblock is false"));
13398                 SCTP_TCB_LOCK_ASSERT(stcb);
13399                 KASSERT((asoc->state & SCTP_STATE_ABOUT_TO_BE_FREED) == 0,
13400                     ("Association about to be freed"));
13401                 KASSERT((asoc->state & SCTP_STATE_WAS_ABORTED) == 0,
13402                     ("Association was aborted"));
13403
13404                 /* The out streams might be reallocated. */
13405                 strm = &asoc->strmout[srcv->sinfo_stream];
13406                 if (sp != NULL) {
13407                         if (sp->msg_is_complete == 0) {
13408                                 strm->last_msg_incomplete = 1;
13409                                 if (asoc->idata_supported == 0) {
13410                                         asoc->stream_locked = 1;
13411                                         asoc->stream_locked_on = srcv->sinfo_stream;
13412                                 }
13413                         } else {
13414                                 sp->sender_all_done = 1;
13415                                 strm->last_msg_incomplete = 0;
13416                                 asoc->stream_locked = 0;
13417                         }
13418                         sp->processing = 0;
13419                 } else {
13420                         SCTP_PRINTF("Huh no sp TSNH?\n");
13421                         strm->last_msg_incomplete = 0;
13422                         asoc->stream_locked = 0;
13423                 }
13424                 if (uio->uio_resid == 0) {
13425                         got_all_of_the_send = true;
13426                 }
13427         } else {
13428                 error = sctp_msg_append(stcb, net, top, srcv);
13429                 top = NULL;
13430                 if ((sinfo_flags & SCTP_EOF) != 0) {
13431                         got_all_of_the_send = true;
13432                 }
13433         }
13434         if (error != 0) {
13435                 goto out;
13436         }
13437
13438 dataless_eof:
13439         KASSERT(stcb != NULL, ("stcb is NULL"));
13440         KASSERT(hold_tcblock, ("hold_tcblock is false"));
13441         SCTP_TCB_LOCK_ASSERT(stcb);
13442         KASSERT((asoc->state & SCTP_STATE_ABOUT_TO_BE_FREED) == 0,
13443             ("Association about to be freed"));
13444         KASSERT((asoc->state & SCTP_STATE_WAS_ABORTED) == 0,
13445             ("Association was aborted"));
13446
13447         /* EOF thing ? */
13448         if ((sinfo_flags & SCTP_EOF) && got_all_of_the_send) {
13449                 SCTP_STAT_INCR(sctps_sends_with_eof);
13450                 error = 0;
13451                 if (TAILQ_EMPTY(&asoc->send_queue) &&
13452                     TAILQ_EMPTY(&asoc->sent_queue) &&
13453                     sctp_is_there_unsent_data(stcb, SCTP_SO_LOCKED) == 0) {
13454                         if ((*asoc->ss_functions.sctp_ss_is_user_msgs_incomplete) (stcb, asoc)) {
13455                                 goto abort_anyway;
13456                         }
13457                         /* there is nothing queued to send, so I'm done... */
13458                         if ((SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_SENT) &&
13459                             (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
13460                             (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
13461                                 struct sctp_nets *netp;
13462
13463                                 /* only send SHUTDOWN the first time through */
13464                                 if (SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) {
13465                                         SCTP_STAT_DECR_GAUGE32(sctps_currestab);
13466                                 }
13467                                 SCTP_SET_STATE(stcb, SCTP_STATE_SHUTDOWN_SENT);
13468                                 sctp_stop_timers_for_shutdown(stcb);
13469                                 if (asoc->alternate != NULL) {
13470                                         netp = asoc->alternate;
13471                                 } else {
13472                                         netp = asoc->primary_destination;
13473                                 }
13474                                 sctp_send_shutdown(stcb, netp);
13475                                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb,
13476                                     netp);
13477                                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
13478                                     NULL);
13479                         }
13480                 } else {
13481                         /*-
13482                          * we still got (or just got) data to send, so set
13483                          * SHUTDOWN_PENDING
13484                          */
13485                         /*-
13486                          * XXX sockets draft says that SCTP_EOF should be
13487                          * sent with no data.  currently, we will allow user
13488                          * data to be sent first and move to
13489                          * SHUTDOWN-PENDING
13490                          */
13491                         if ((SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_SENT) &&
13492                             (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
13493                             (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
13494                                 if ((*asoc->ss_functions.sctp_ss_is_user_msgs_incomplete) (stcb, asoc)) {
13495                                         SCTP_ADD_SUBSTATE(stcb, SCTP_STATE_PARTIAL_MSG_LEFT);
13496                                 }
13497                                 SCTP_ADD_SUBSTATE(stcb, SCTP_STATE_SHUTDOWN_PENDING);
13498                                 if (TAILQ_EMPTY(&asoc->send_queue) &&
13499                                     TAILQ_EMPTY(&asoc->sent_queue) &&
13500                                     (asoc->state & SCTP_STATE_PARTIAL_MSG_LEFT)) {
13501                                         struct mbuf *op_err;
13502                                         char msg[SCTP_DIAG_INFO_LEN];
13503
13504                         abort_anyway:
13505                                         if (free_cnt_applied) {
13506                                                 atomic_subtract_int(&asoc->refcnt, 1);
13507                                                 free_cnt_applied = false;
13508                                         }
13509                                         SCTP_SNPRINTF(msg, sizeof(msg),
13510                                             "%s:%d at %s", __FILE__, __LINE__, __func__);
13511                                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
13512                                             msg);
13513                                         NET_EPOCH_ENTER(et);
13514                                         sctp_abort_an_association(stcb->sctp_ep, stcb,
13515                                             op_err, false, SCTP_SO_LOCKED);
13516                                         NET_EPOCH_EXIT(et);
13517                                         hold_tcblock = false;
13518                                         stcb = NULL;
13519                                         error = ECONNABORTED;
13520                                         goto out;
13521                                 }
13522                                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
13523                                     NULL);
13524                                 sctp_feature_off(inp, SCTP_PCB_FLAGS_NODELAY);
13525                         }
13526                 }
13527         }
13528
13529 skip_out_eof:
13530         KASSERT(stcb != NULL, ("stcb is NULL"));
13531         KASSERT(hold_tcblock, ("hold_tcblock is false"));
13532         SCTP_TCB_LOCK_ASSERT(stcb);
13533         KASSERT((asoc->state & SCTP_STATE_ABOUT_TO_BE_FREED) == 0,
13534             ("Association about to be freed"));
13535         KASSERT((asoc->state & SCTP_STATE_WAS_ABORTED) == 0,
13536             ("Association was aborted"));
13537
13538         some_on_control = !TAILQ_EMPTY(&asoc->control_send_queue);
13539         if (queue_only_for_init) {
13540                 if (SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) {
13541                         /* a collision took us forward? */
13542                         queue_only = 0;
13543                 } else {
13544                         NET_EPOCH_ENTER(et);
13545                         sctp_send_initiate(inp, stcb, SCTP_SO_LOCKED);
13546                         NET_EPOCH_EXIT(et);
13547                         SCTP_SET_STATE(stcb, SCTP_STATE_COOKIE_WAIT);
13548                         queue_only = 1;
13549                 }
13550         }
13551
13552         KASSERT(stcb != NULL, ("stcb is NULL"));
13553         KASSERT(hold_tcblock, ("hold_tcblock is false"));
13554         SCTP_TCB_LOCK_ASSERT(stcb);
13555         KASSERT((asoc->state & SCTP_STATE_ABOUT_TO_BE_FREED) == 0,
13556             ("Association about to be freed"));
13557         KASSERT((asoc->state & SCTP_STATE_WAS_ABORTED) == 0,
13558             ("Association was aborted"));
13559
13560         if ((net->flight_size > net->cwnd) &&
13561             (asoc->sctp_cmt_on_off == 0)) {
13562                 SCTP_STAT_INCR(sctps_send_cwnd_avoid);
13563                 queue_only = 1;
13564         } else if (asoc->ifp_had_enobuf) {
13565                 SCTP_STAT_INCR(sctps_ifnomemqueued);
13566                 if (net->flight_size > (2 * net->mtu)) {
13567                         queue_only = 1;
13568                 }
13569                 asoc->ifp_had_enobuf = 0;
13570         }
13571         un_sent = asoc->total_output_queue_size - asoc->total_flight;
13572         if ((sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY)) &&
13573             (asoc->total_flight > 0) &&
13574             (asoc->stream_queue_cnt < SCTP_MAX_DATA_BUNDLING) &&
13575             (un_sent < (int)(asoc->smallest_mtu - SCTP_MIN_OVERHEAD))) {
13576                 /*-
13577                  * Ok, Nagle is set on and we have data outstanding.
13578                  * Don't send anything and let SACKs drive out the
13579                  * data unless wen have a "full" segment to send.
13580                  */
13581                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
13582                         sctp_log_nagle_event(stcb, SCTP_NAGLE_APPLIED);
13583                 }
13584                 SCTP_STAT_INCR(sctps_naglequeued);
13585                 nagle_applies = 1;
13586         } else {
13587                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
13588                         if (sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY))
13589                                 sctp_log_nagle_event(stcb, SCTP_NAGLE_SKIPPED);
13590                 }
13591                 SCTP_STAT_INCR(sctps_naglesent);
13592                 nagle_applies = 0;
13593         }
13594         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13595                 sctp_misc_ints(SCTP_CWNDLOG_PRESEND, queue_only_for_init, queue_only,
13596                     nagle_applies, un_sent);
13597                 sctp_misc_ints(SCTP_CWNDLOG_PRESEND, asoc->total_output_queue_size,
13598                     asoc->total_flight,
13599                     asoc->chunks_on_out_queue, asoc->total_flight_count);
13600         }
13601
13602         KASSERT(stcb != NULL, ("stcb is NULL"));
13603         KASSERT(hold_tcblock, ("hold_tcblock is false"));
13604         SCTP_TCB_LOCK_ASSERT(stcb);
13605         KASSERT((asoc->state & SCTP_STATE_ABOUT_TO_BE_FREED) == 0,
13606             ("Association about to be freed"));
13607         KASSERT((asoc->state & SCTP_STATE_WAS_ABORTED) == 0,
13608             ("Association was aborted"));
13609
13610         NET_EPOCH_ENTER(et);
13611         if ((queue_only == 0) && (nagle_applies == 0) && (asoc->peers_rwnd && un_sent)) {
13612                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13613         } else if ((queue_only == 0) &&
13614                     (asoc->peers_rwnd == 0) &&
13615             (asoc->total_flight == 0)) {
13616                 /* We get to have a probe outstanding */
13617                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13618         } else if (some_on_control) {
13619                 int num_out, reason;
13620
13621                 /* Here we do control only */
13622                 (void)sctp_med_chunk_output(inp, stcb, asoc, &num_out,
13623                     &reason, 1, 1, &now, &now_filled,
13624                     sctp_get_frag_point(stcb),
13625                     SCTP_SO_LOCKED);
13626         }
13627         NET_EPOCH_EXIT(et);
13628         SCTPDBG(SCTP_DEBUG_OUTPUT1, "USR Send complete qo:%d prw:%d unsent:%d tf:%d cooq:%d toqs:%d err:%d\n",
13629             queue_only, asoc->peers_rwnd, un_sent,
13630             asoc->total_flight, asoc->chunks_on_out_queue,
13631             asoc->total_output_queue_size, error);
13632
13633         KASSERT(stcb != NULL, ("stcb is NULL"));
13634         KASSERT(hold_tcblock, ("hold_tcblock is false"));
13635         SCTP_TCB_LOCK_ASSERT(stcb);
13636         KASSERT((asoc->state & SCTP_STATE_ABOUT_TO_BE_FREED) == 0,
13637             ("Association about to be freed"));
13638         KASSERT((asoc->state & SCTP_STATE_WAS_ABORTED) == 0,
13639             ("Association was aborted"));
13640
13641 out:
13642 out_unlocked:
13643         if (create_lock_applied) {
13644                 SCTP_ASOC_CREATE_UNLOCK(inp);
13645         }
13646         if (stcb != NULL) {
13647                 if (local_soresv) {
13648                         atomic_subtract_int(&asoc->sb_send_resv, (int)sndlen);
13649                 }
13650                 if (hold_tcblock) {
13651                         SCTP_TCB_UNLOCK(stcb);
13652                 }
13653                 if (free_cnt_applied) {
13654                         atomic_subtract_int(&asoc->refcnt, 1);
13655                 }
13656         }
13657         if (top != NULL) {
13658                 sctp_m_freem(top);
13659         }
13660         if (control != NULL) {
13661                 sctp_m_freem(control);
13662         }
13663         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, error);
13664         return (error);
13665 }
13666
13667 /*
13668  * generate an AUTHentication chunk, if required
13669  */
13670 struct mbuf *
13671 sctp_add_auth_chunk(struct mbuf *m, struct mbuf **m_end,
13672     struct sctp_auth_chunk **auth_ret, uint32_t *offset,
13673     struct sctp_tcb *stcb, uint8_t chunk)
13674 {
13675         struct mbuf *m_auth;
13676         struct sctp_auth_chunk *auth;
13677         int chunk_len;
13678         struct mbuf *cn;
13679
13680         if ((m_end == NULL) || (auth_ret == NULL) || (offset == NULL) ||
13681             (stcb == NULL))
13682                 return (m);
13683
13684         if (stcb->asoc.auth_supported == 0) {
13685                 return (m);
13686         }
13687         /* does the requested chunk require auth? */
13688         if (!sctp_auth_is_required_chunk(chunk, stcb->asoc.peer_auth_chunks)) {
13689                 return (m);
13690         }
13691         m_auth = sctp_get_mbuf_for_msg(sizeof(*auth), 0, M_NOWAIT, 1, MT_HEADER);
13692         if (m_auth == NULL) {
13693                 /* no mbuf's */
13694                 return (m);
13695         }
13696         /* reserve some space if this will be the first mbuf */
13697         if (m == NULL)
13698                 SCTP_BUF_RESV_UF(m_auth, SCTP_MIN_OVERHEAD);
13699         /* fill in the AUTH chunk details */
13700         auth = mtod(m_auth, struct sctp_auth_chunk *);
13701         memset(auth, 0, sizeof(*auth));
13702         auth->ch.chunk_type = SCTP_AUTHENTICATION;
13703         auth->ch.chunk_flags = 0;
13704         chunk_len = sizeof(*auth) +
13705             sctp_get_hmac_digest_len(stcb->asoc.peer_hmac_id);
13706         auth->ch.chunk_length = htons(chunk_len);
13707         auth->hmac_id = htons(stcb->asoc.peer_hmac_id);
13708         /* key id and hmac digest will be computed and filled in upon send */
13709
13710         /* save the offset where the auth was inserted into the chain */
13711         *offset = 0;
13712         for (cn = m; cn; cn = SCTP_BUF_NEXT(cn)) {
13713                 *offset += SCTP_BUF_LEN(cn);
13714         }
13715
13716         /* update length and return pointer to the auth chunk */
13717         SCTP_BUF_LEN(m_auth) = chunk_len;
13718         m = sctp_copy_mbufchain(m_auth, m, m_end, 1, chunk_len, 0);
13719         if (auth_ret != NULL)
13720                 *auth_ret = auth;
13721
13722         return (m);
13723 }
13724
13725 #ifdef INET6
13726 int
13727 sctp_v6src_match_nexthop(struct sockaddr_in6 *src6, sctp_route_t *ro)
13728 {
13729         struct nd_prefix *pfx = NULL;
13730         struct nd_pfxrouter *pfxrtr = NULL;
13731         struct sockaddr_in6 gw6;
13732
13733         if (ro == NULL || ro->ro_nh == NULL || src6->sin6_family != AF_INET6)
13734                 return (0);
13735
13736         /* get prefix entry of address */
13737         ND6_RLOCK();
13738         LIST_FOREACH(pfx, &MODULE_GLOBAL(nd_prefix), ndpr_entry) {
13739                 if (pfx->ndpr_stateflags & NDPRF_DETACHED)
13740                         continue;
13741                 if (IN6_ARE_MASKED_ADDR_EQUAL(&pfx->ndpr_prefix.sin6_addr,
13742                     &src6->sin6_addr, &pfx->ndpr_mask))
13743                         break;
13744         }
13745         /* no prefix entry in the prefix list */
13746         if (pfx == NULL) {
13747                 ND6_RUNLOCK();
13748                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "No prefix entry for ");
13749                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)src6);
13750                 return (0);
13751         }
13752
13753         SCTPDBG(SCTP_DEBUG_OUTPUT2, "v6src_match_nexthop(), Prefix entry is ");
13754         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)src6);
13755
13756         /* search installed gateway from prefix entry */
13757         LIST_FOREACH(pfxrtr, &pfx->ndpr_advrtrs, pfr_entry) {
13758                 memset(&gw6, 0, sizeof(struct sockaddr_in6));
13759                 gw6.sin6_family = AF_INET6;
13760                 gw6.sin6_len = sizeof(struct sockaddr_in6);
13761                 memcpy(&gw6.sin6_addr, &pfxrtr->router->rtaddr,
13762                     sizeof(struct in6_addr));
13763                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "prefix router is ");
13764                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)&gw6);
13765                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "installed router is ");
13766                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, &ro->ro_nh->gw_sa);
13767                 if (sctp_cmpaddr((struct sockaddr *)&gw6, &ro->ro_nh->gw_sa)) {
13768                         ND6_RUNLOCK();
13769                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "pfxrouter is installed\n");
13770                         return (1);
13771                 }
13772         }
13773         ND6_RUNLOCK();
13774         SCTPDBG(SCTP_DEBUG_OUTPUT2, "pfxrouter is not installed\n");
13775         return (0);
13776 }
13777 #endif
13778
13779 int
13780 sctp_v4src_match_nexthop(struct sctp_ifa *sifa, sctp_route_t *ro)
13781 {
13782 #ifdef INET
13783         struct sockaddr_in *sin, *mask;
13784         struct ifaddr *ifa;
13785         struct in_addr srcnetaddr, gwnetaddr;
13786
13787         if (ro == NULL || ro->ro_nh == NULL ||
13788             sifa->address.sa.sa_family != AF_INET) {
13789                 return (0);
13790         }
13791         ifa = (struct ifaddr *)sifa->ifa;
13792         mask = (struct sockaddr_in *)(ifa->ifa_netmask);
13793         sin = &sifa->address.sin;
13794         srcnetaddr.s_addr = (sin->sin_addr.s_addr & mask->sin_addr.s_addr);
13795         SCTPDBG(SCTP_DEBUG_OUTPUT1, "match_nexthop4: src address is ");
13796         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, &sifa->address.sa);
13797         SCTPDBG(SCTP_DEBUG_OUTPUT1, "network address is %x\n", srcnetaddr.s_addr);
13798
13799         sin = &ro->ro_nh->gw4_sa;
13800         gwnetaddr.s_addr = (sin->sin_addr.s_addr & mask->sin_addr.s_addr);
13801         SCTPDBG(SCTP_DEBUG_OUTPUT1, "match_nexthop4: nexthop is ");
13802         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, &ro->ro_nh->gw_sa);
13803         SCTPDBG(SCTP_DEBUG_OUTPUT1, "network address is %x\n", gwnetaddr.s_addr);
13804         if (srcnetaddr.s_addr == gwnetaddr.s_addr) {
13805                 return (1);
13806         }
13807 #endif
13808         return (0);
13809 }