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) == 0) {
2848                                 continue;
2849                         }
2850                 }
2851 #endif
2852 #ifdef INET
2853                 /* Avoid topologically incorrect IPv4 address */
2854                 if (stcb && fam == AF_INET &&
2855                     sctp_is_mobility_feature_on(stcb->sctp_ep, SCTP_MOBILITY_BASE)) {
2856                         if (sctp_v4src_match_nexthop(sifa, ro) == 0) {
2857                                 continue;
2858                         }
2859                 }
2860 #endif
2861                 if (stcb) {
2862                         if (sctp_is_address_in_scope(ifa, &stcb->asoc.scope, 0) == 0) {
2863                                 continue;
2864                         }
2865                         if (((non_asoc_addr_ok == 0) &&
2866                             (sctp_is_addr_restricted(stcb, sifa))) ||
2867                             (non_asoc_addr_ok &&
2868                             (sctp_is_addr_restricted(stcb, sifa)) &&
2869                             (!sctp_is_addr_pending(stcb, sifa)))) {
2870                                 /*
2871                                  * It is restricted for some reason..
2872                                  * probably not yet added.
2873                                  */
2874                                 continue;
2875                         }
2876                 }
2877                 if (num_eligible_addr >= addr_wanted) {
2878                         return (sifa);
2879                 }
2880                 num_eligible_addr++;
2881         }
2882         return (NULL);
2883 }
2884
2885 static int
2886 sctp_count_num_preferred_boundall(struct sctp_ifn *ifn,
2887     struct sctp_inpcb *inp,
2888     struct sctp_tcb *stcb,
2889     int non_asoc_addr_ok,
2890     uint8_t dest_is_loop,
2891     uint8_t dest_is_priv,
2892     sa_family_t fam)
2893 {
2894         struct sctp_ifa *ifa, *sifa;
2895         int num_eligible_addr = 0;
2896
2897         LIST_FOREACH(ifa, &ifn->ifalist, next_ifa) {
2898 #ifdef INET
2899                 if ((ifa->address.sa.sa_family == AF_INET) &&
2900                     (prison_check_ip4(inp->ip_inp.inp.inp_cred,
2901                     &ifa->address.sin.sin_addr) != 0)) {
2902                         continue;
2903                 }
2904 #endif
2905 #ifdef INET6
2906                 if ((ifa->address.sa.sa_family == AF_INET6) &&
2907                     (stcb != NULL) &&
2908                     (prison_check_ip6(inp->ip_inp.inp.inp_cred,
2909                     &ifa->address.sin6.sin6_addr) != 0)) {
2910                         continue;
2911                 }
2912 #endif
2913                 if ((ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
2914                     (non_asoc_addr_ok == 0)) {
2915                         continue;
2916                 }
2917                 sifa = sctp_is_ifa_addr_preferred(ifa, dest_is_loop,
2918                     dest_is_priv, fam);
2919                 if (sifa == NULL) {
2920                         continue;
2921                 }
2922                 if (stcb) {
2923                         if (sctp_is_address_in_scope(ifa, &stcb->asoc.scope, 0) == 0) {
2924                                 continue;
2925                         }
2926                         if (((non_asoc_addr_ok == 0) &&
2927                             (sctp_is_addr_restricted(stcb, sifa))) ||
2928                             (non_asoc_addr_ok &&
2929                             (sctp_is_addr_restricted(stcb, sifa)) &&
2930                             (!sctp_is_addr_pending(stcb, sifa)))) {
2931                                 /*
2932                                  * It is restricted for some reason..
2933                                  * probably not yet added.
2934                                  */
2935                                 continue;
2936                         }
2937                 }
2938                 num_eligible_addr++;
2939         }
2940         return (num_eligible_addr);
2941 }
2942
2943 static struct sctp_ifa *
2944 sctp_choose_boundall(struct sctp_inpcb *inp,
2945     struct sctp_tcb *stcb,
2946     struct sctp_nets *net,
2947     sctp_route_t *ro,
2948     uint32_t vrf_id,
2949     uint8_t dest_is_priv,
2950     uint8_t dest_is_loop,
2951     int non_asoc_addr_ok,
2952     sa_family_t fam)
2953 {
2954         int cur_addr_num = 0, num_preferred = 0;
2955         void *ifn;
2956         struct sctp_ifn *sctp_ifn, *looked_at = NULL, *emit_ifn;
2957         struct sctp_ifa *sctp_ifa, *sifa;
2958         uint32_t ifn_index;
2959         struct sctp_vrf *vrf;
2960 #ifdef INET
2961         int retried = 0;
2962 #endif
2963
2964         /*-
2965          * For boundall we can use any address in the association.
2966          * If non_asoc_addr_ok is set we can use any address (at least in
2967          * theory). So we look for preferred addresses first. If we find one,
2968          * we use it. Otherwise we next try to get an address on the
2969          * interface, which we should be able to do (unless non_asoc_addr_ok
2970          * is false and we are routed out that way). In these cases where we
2971          * can't use the address of the interface we go through all the
2972          * ifn's looking for an address we can use and fill that in. Punting
2973          * means we send back address 0, which will probably cause problems
2974          * actually since then IP will fill in the address of the route ifn,
2975          * which means we probably already rejected it.. i.e. here comes an
2976          * abort :-<.
2977          */
2978         vrf = sctp_find_vrf(vrf_id);
2979         if (vrf == NULL)
2980                 return (NULL);
2981
2982         ifn = SCTP_GET_IFN_VOID_FROM_ROUTE(ro);
2983         ifn_index = SCTP_GET_IF_INDEX_FROM_ROUTE(ro);
2984         SCTPDBG(SCTP_DEBUG_OUTPUT2, "ifn from route:%p ifn_index:%d\n", ifn, ifn_index);
2985         emit_ifn = looked_at = sctp_ifn = sctp_find_ifn(ifn, ifn_index);
2986         if (sctp_ifn == NULL) {
2987                 /* ?? We don't have this guy ?? */
2988                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "No ifn emit interface?\n");
2989                 goto bound_all_plan_b;
2990         }
2991         SCTPDBG(SCTP_DEBUG_OUTPUT2, "ifn_index:%d name:%s is emit interface\n",
2992             ifn_index, sctp_ifn->ifn_name);
2993
2994         if (net) {
2995                 cur_addr_num = net->indx_of_eligible_next_to_use;
2996         }
2997         num_preferred = sctp_count_num_preferred_boundall(sctp_ifn,
2998             inp, stcb,
2999             non_asoc_addr_ok,
3000             dest_is_loop,
3001             dest_is_priv, fam);
3002         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Found %d preferred source addresses for intf:%s\n",
3003             num_preferred, sctp_ifn->ifn_name);
3004         if (num_preferred == 0) {
3005                 /*
3006                  * no eligible addresses, we must use some other interface
3007                  * address if we can find one.
3008                  */
3009                 goto bound_all_plan_b;
3010         }
3011         /*
3012          * Ok we have num_eligible_addr set with how many we can use, this
3013          * may vary from call to call due to addresses being deprecated
3014          * etc..
3015          */
3016         if (cur_addr_num >= num_preferred) {
3017                 cur_addr_num = 0;
3018         }
3019         /*
3020          * select the nth address from the list (where cur_addr_num is the
3021          * nth) and 0 is the first one, 1 is the second one etc...
3022          */
3023         SCTPDBG(SCTP_DEBUG_OUTPUT2, "cur_addr_num:%d\n", cur_addr_num);
3024
3025         sctp_ifa = sctp_select_nth_preferred_addr_from_ifn_boundall(sctp_ifn, inp, stcb, non_asoc_addr_ok, dest_is_loop,
3026             dest_is_priv, cur_addr_num, fam, ro);
3027
3028         /* if sctp_ifa is NULL something changed??, fall to plan b. */
3029         if (sctp_ifa) {
3030                 atomic_add_int(&sctp_ifa->refcount, 1);
3031                 if (net) {
3032                         /* save off where the next one we will want */
3033                         net->indx_of_eligible_next_to_use = cur_addr_num + 1;
3034                 }
3035                 return (sctp_ifa);
3036         }
3037         /*
3038          * plan_b: Look at all interfaces and find a preferred address. If
3039          * no preferred fall through to plan_c.
3040          */
3041 bound_all_plan_b:
3042         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Trying Plan B\n");
3043         LIST_FOREACH(sctp_ifn, &vrf->ifnlist, next_ifn) {
3044                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "Examine interface %s\n",
3045                     sctp_ifn->ifn_name);
3046                 if (dest_is_loop == 0 && SCTP_IFN_IS_IFT_LOOP(sctp_ifn)) {
3047                         /* wrong base scope */
3048                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "skip\n");
3049                         continue;
3050                 }
3051                 if ((sctp_ifn == looked_at) && looked_at) {
3052                         /* already looked at this guy */
3053                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "already seen\n");
3054                         continue;
3055                 }
3056                 num_preferred = sctp_count_num_preferred_boundall(sctp_ifn, inp, stcb, non_asoc_addr_ok,
3057                     dest_is_loop, dest_is_priv, fam);
3058                 SCTPDBG(SCTP_DEBUG_OUTPUT2,
3059                     "Found ifn:%p %d preferred source addresses\n",
3060                     ifn, num_preferred);
3061                 if (num_preferred == 0) {
3062                         /* None on this interface. */
3063                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "No preferred -- skipping to next\n");
3064                         continue;
3065                 }
3066                 SCTPDBG(SCTP_DEBUG_OUTPUT2,
3067                     "num preferred:%d on interface:%p cur_addr_num:%d\n",
3068                     num_preferred, (void *)sctp_ifn, cur_addr_num);
3069
3070                 /*
3071                  * Ok we have num_eligible_addr set with how many we can
3072                  * use, this may vary from call to call due to addresses
3073                  * being deprecated etc..
3074                  */
3075                 if (cur_addr_num >= num_preferred) {
3076                         cur_addr_num = 0;
3077                 }
3078                 sifa = sctp_select_nth_preferred_addr_from_ifn_boundall(sctp_ifn, inp, stcb, non_asoc_addr_ok, dest_is_loop,
3079                     dest_is_priv, cur_addr_num, fam, ro);
3080                 if (sifa == NULL)
3081                         continue;
3082                 if (net) {
3083                         net->indx_of_eligible_next_to_use = cur_addr_num + 1;
3084                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "we selected %d\n",
3085                             cur_addr_num);
3086                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Source:");
3087                         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, &sifa->address.sa);
3088                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Dest:");
3089                         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, &net->ro._l_addr.sa);
3090                 }
3091                 atomic_add_int(&sifa->refcount, 1);
3092                 return (sifa);
3093         }
3094 #ifdef INET
3095 again_with_private_addresses_allowed:
3096 #endif
3097         /* plan_c: do we have an acceptable address on the emit interface */
3098         sifa = NULL;
3099         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Trying Plan C: find acceptable on interface\n");
3100         if (emit_ifn == NULL) {
3101                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "Jump to Plan D - no emit_ifn\n");
3102                 goto plan_d;
3103         }
3104         LIST_FOREACH(sctp_ifa, &emit_ifn->ifalist, next_ifa) {
3105                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "ifa:%p\n", (void *)sctp_ifa);
3106 #ifdef INET
3107                 if ((sctp_ifa->address.sa.sa_family == AF_INET) &&
3108                     (prison_check_ip4(inp->ip_inp.inp.inp_cred,
3109                     &sctp_ifa->address.sin.sin_addr) != 0)) {
3110                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Jailed\n");
3111                         continue;
3112                 }
3113 #endif
3114 #ifdef INET6
3115                 if ((sctp_ifa->address.sa.sa_family == AF_INET6) &&
3116                     (prison_check_ip6(inp->ip_inp.inp.inp_cred,
3117                     &sctp_ifa->address.sin6.sin6_addr) != 0)) {
3118                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Jailed\n");
3119                         continue;
3120                 }
3121 #endif
3122                 if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
3123                     (non_asoc_addr_ok == 0)) {
3124                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Defer\n");
3125                         continue;
3126                 }
3127                 sifa = sctp_is_ifa_addr_acceptable(sctp_ifa, dest_is_loop,
3128                     dest_is_priv, fam);
3129                 if (sifa == NULL) {
3130                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "IFA not acceptable\n");
3131                         continue;
3132                 }
3133                 if (stcb) {
3134                         if (sctp_is_address_in_scope(sifa, &stcb->asoc.scope, 0) == 0) {
3135                                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "NOT in scope\n");
3136                                 sifa = NULL;
3137                                 continue;
3138                         }
3139                         if (((non_asoc_addr_ok == 0) &&
3140                             (sctp_is_addr_restricted(stcb, sifa))) ||
3141                             (non_asoc_addr_ok &&
3142                             (sctp_is_addr_restricted(stcb, sifa)) &&
3143                             (!sctp_is_addr_pending(stcb, sifa)))) {
3144                                 /*
3145                                  * It is restricted for some reason..
3146                                  * probably not yet added.
3147                                  */
3148                                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "Its restricted\n");
3149                                 sifa = NULL;
3150                                 continue;
3151                         }
3152                 }
3153                 atomic_add_int(&sifa->refcount, 1);
3154                 goto out;
3155         }
3156 plan_d:
3157         /*
3158          * plan_d: We are in trouble. No preferred address on the emit
3159          * interface. And not even a preferred address on all interfaces. Go
3160          * out and see if we can find an acceptable address somewhere
3161          * amongst all interfaces.
3162          */
3163         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Trying Plan D looked_at is %p\n", (void *)looked_at);
3164         LIST_FOREACH(sctp_ifn, &vrf->ifnlist, next_ifn) {
3165                 if (dest_is_loop == 0 && SCTP_IFN_IS_IFT_LOOP(sctp_ifn)) {
3166                         /* wrong base scope */
3167                         continue;
3168                 }
3169                 LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
3170 #ifdef INET
3171                         if ((sctp_ifa->address.sa.sa_family == AF_INET) &&
3172                             (prison_check_ip4(inp->ip_inp.inp.inp_cred,
3173                             &sctp_ifa->address.sin.sin_addr) != 0)) {
3174                                 continue;
3175                         }
3176 #endif
3177 #ifdef INET6
3178                         if ((sctp_ifa->address.sa.sa_family == AF_INET6) &&
3179                             (prison_check_ip6(inp->ip_inp.inp.inp_cred,
3180                             &sctp_ifa->address.sin6.sin6_addr) != 0)) {
3181                                 continue;
3182                         }
3183 #endif
3184                         if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
3185                             (non_asoc_addr_ok == 0))
3186                                 continue;
3187                         sifa = sctp_is_ifa_addr_acceptable(sctp_ifa,
3188                             dest_is_loop,
3189                             dest_is_priv, fam);
3190                         if (sifa == NULL)
3191                                 continue;
3192                         if (stcb) {
3193                                 if (sctp_is_address_in_scope(sifa, &stcb->asoc.scope, 0) == 0) {
3194                                         sifa = NULL;
3195                                         continue;
3196                                 }
3197                                 if (((non_asoc_addr_ok == 0) &&
3198                                     (sctp_is_addr_restricted(stcb, sifa))) ||
3199                                     (non_asoc_addr_ok &&
3200                                     (sctp_is_addr_restricted(stcb, sifa)) &&
3201                                     (!sctp_is_addr_pending(stcb, sifa)))) {
3202                                         /*
3203                                          * It is restricted for some
3204                                          * reason.. probably not yet added.
3205                                          */
3206                                         sifa = NULL;
3207                                         continue;
3208                                 }
3209                         }
3210                         goto out;
3211                 }
3212         }
3213 #ifdef INET
3214         if (stcb) {
3215                 if ((retried == 0) && (stcb->asoc.scope.ipv4_local_scope == 0)) {
3216                         stcb->asoc.scope.ipv4_local_scope = 1;
3217                         retried = 1;
3218                         goto again_with_private_addresses_allowed;
3219                 } else if (retried == 1) {
3220                         stcb->asoc.scope.ipv4_local_scope = 0;
3221                 }
3222         }
3223 #endif
3224 out:
3225 #ifdef INET
3226         if (sifa) {
3227                 if (retried == 1) {
3228                         LIST_FOREACH(sctp_ifn, &vrf->ifnlist, next_ifn) {
3229                                 if (dest_is_loop == 0 && SCTP_IFN_IS_IFT_LOOP(sctp_ifn)) {
3230                                         /* wrong base scope */
3231                                         continue;
3232                                 }
3233                                 LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
3234                                         struct sctp_ifa *tmp_sifa;
3235
3236 #ifdef INET
3237                                         if ((sctp_ifa->address.sa.sa_family == AF_INET) &&
3238                                             (prison_check_ip4(inp->ip_inp.inp.inp_cred,
3239                                             &sctp_ifa->address.sin.sin_addr) != 0)) {
3240                                                 continue;
3241                                         }
3242 #endif
3243 #ifdef INET6
3244                                         if ((sctp_ifa->address.sa.sa_family == AF_INET6) &&
3245                                             (prison_check_ip6(inp->ip_inp.inp.inp_cred,
3246                                             &sctp_ifa->address.sin6.sin6_addr) != 0)) {
3247                                                 continue;
3248                                         }
3249 #endif
3250                                         if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
3251                                             (non_asoc_addr_ok == 0))
3252                                                 continue;
3253                                         tmp_sifa = sctp_is_ifa_addr_acceptable(sctp_ifa,
3254                                             dest_is_loop,
3255                                             dest_is_priv, fam);
3256                                         if (tmp_sifa == NULL) {
3257                                                 continue;
3258                                         }
3259                                         if (tmp_sifa == sifa) {
3260                                                 continue;
3261                                         }
3262                                         if (stcb) {
3263                                                 if (sctp_is_address_in_scope(tmp_sifa,
3264                                                     &stcb->asoc.scope, 0) == 0) {
3265                                                         continue;
3266                                                 }
3267                                                 if (((non_asoc_addr_ok == 0) &&
3268                                                     (sctp_is_addr_restricted(stcb, tmp_sifa))) ||
3269                                                     (non_asoc_addr_ok &&
3270                                                     (sctp_is_addr_restricted(stcb, tmp_sifa)) &&
3271                                                     (!sctp_is_addr_pending(stcb, tmp_sifa)))) {
3272                                                         /*
3273                                                          * It is restricted
3274                                                          * for some reason..
3275                                                          * probably not yet
3276                                                          * added.
3277                                                          */
3278                                                         continue;
3279                                                 }
3280                                         }
3281                                         if ((tmp_sifa->address.sin.sin_family == AF_INET) &&
3282                                             (IN4_ISPRIVATE_ADDRESS(&(tmp_sifa->address.sin.sin_addr)))) {
3283                                                 sctp_add_local_addr_restricted(stcb, tmp_sifa);
3284                                         }
3285                                 }
3286                         }
3287                 }
3288                 atomic_add_int(&sifa->refcount, 1);
3289         }
3290 #endif
3291         return (sifa);
3292 }
3293
3294 /* tcb may be NULL */
3295 struct sctp_ifa *
3296 sctp_source_address_selection(struct sctp_inpcb *inp,
3297     struct sctp_tcb *stcb,
3298     sctp_route_t *ro,
3299     struct sctp_nets *net,
3300     int non_asoc_addr_ok, uint32_t vrf_id)
3301 {
3302         struct sctp_ifa *answer;
3303         uint8_t dest_is_priv, dest_is_loop;
3304         sa_family_t fam;
3305 #ifdef INET
3306         struct sockaddr_in *to = (struct sockaddr_in *)&ro->ro_dst;
3307 #endif
3308 #ifdef INET6
3309         struct sockaddr_in6 *to6 = (struct sockaddr_in6 *)&ro->ro_dst;
3310 #endif
3311
3312         /**
3313          * Rules:
3314          * - Find the route if needed, cache if I can.
3315          * - Look at interface address in route, Is it in the bound list. If so we
3316          *   have the best source.
3317          * - If not we must rotate amongst the addresses.
3318          *
3319          * Caveats and issues
3320          *
3321          * Do we need to pay attention to scope. We can have a private address
3322          * or a global address we are sourcing or sending to. So if we draw
3323          * it out
3324          * zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz
3325          * For V4
3326          * ------------------------------------------
3327          *      source     *      dest  *  result
3328          * -----------------------------------------
3329          * <a>  Private    *    Global  *  NAT
3330          * -----------------------------------------
3331          * <b>  Private    *    Private *  No problem
3332          * -----------------------------------------
3333          * <c>  Global     *    Private *  Huh, How will this work?
3334          * -----------------------------------------
3335          * <d>  Global     *    Global  *  No Problem
3336          *------------------------------------------
3337          * zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz
3338          * For V6
3339          *------------------------------------------
3340          *      source     *      dest  *  result
3341          * -----------------------------------------
3342          * <a>  Linklocal  *    Global  *
3343          * -----------------------------------------
3344          * <b>  Linklocal  * Linklocal  *  No problem
3345          * -----------------------------------------
3346          * <c>  Global     * Linklocal  *  Huh, How will this work?
3347          * -----------------------------------------
3348          * <d>  Global     *    Global  *  No Problem
3349          *------------------------------------------
3350          * zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz
3351          *
3352          * And then we add to that what happens if there are multiple addresses
3353          * assigned to an interface. Remember the ifa on a ifn is a linked
3354          * list of addresses. So one interface can have more than one IP
3355          * address. What happens if we have both a private and a global
3356          * address? Do we then use context of destination to sort out which
3357          * one is best? And what about NAT's sending P->G may get you a NAT
3358          * translation, or should you select the G thats on the interface in
3359          * preference.
3360          *
3361          * Decisions:
3362          *
3363          * - count the number of addresses on the interface.
3364          * - if it is one, no problem except case <c>.
3365          *   For <a> we will assume a NAT out there.
3366          * - if there are more than one, then we need to worry about scope P
3367          *   or G. We should prefer G -> G and P -> P if possible.
3368          *   Then as a secondary fall back to mixed types G->P being a last
3369          *   ditch one.
3370          * - The above all works for bound all, but bound specific we need to
3371          *   use the same concept but instead only consider the bound
3372          *   addresses. If the bound set is NOT assigned to the interface then
3373          *   we must use rotation amongst the bound addresses..
3374          */
3375         if (ro->ro_nh == NULL) {
3376                 /*
3377                  * Need a route to cache.
3378                  */
3379                 SCTP_RTALLOC(ro, vrf_id, inp->fibnum);
3380         }
3381         if (ro->ro_nh == NULL) {
3382                 return (NULL);
3383         }
3384         fam = ro->ro_dst.sa_family;
3385         dest_is_priv = dest_is_loop = 0;
3386         /* Setup our scopes for the destination */
3387         switch (fam) {
3388 #ifdef INET
3389         case AF_INET:
3390                 /* Scope based on outbound address */
3391                 if (IN4_ISLOOPBACK_ADDRESS(&to->sin_addr)) {
3392                         dest_is_loop = 1;
3393                         if (net != NULL) {
3394                                 /* mark it as local */
3395                                 net->addr_is_local = 1;
3396                         }
3397                 } else if ((IN4_ISPRIVATE_ADDRESS(&to->sin_addr))) {
3398                         dest_is_priv = 1;
3399                 }
3400                 break;
3401 #endif
3402 #ifdef INET6
3403         case AF_INET6:
3404                 /* Scope based on outbound address */
3405                 if (IN6_IS_ADDR_LOOPBACK(&to6->sin6_addr) ||
3406                     SCTP_ROUTE_IS_REAL_LOOP(ro)) {
3407                         /*
3408                          * If the address is a loopback address, which
3409                          * consists of "::1" OR "fe80::1%lo0", we are
3410                          * loopback scope. But we don't use dest_is_priv
3411                          * (link local addresses).
3412                          */
3413                         dest_is_loop = 1;
3414                         if (net != NULL) {
3415                                 /* mark it as local */
3416                                 net->addr_is_local = 1;
3417                         }
3418                 } else if (IN6_IS_ADDR_LINKLOCAL(&to6->sin6_addr)) {
3419                         dest_is_priv = 1;
3420                 }
3421                 break;
3422 #endif
3423         }
3424         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Select source addr for:");
3425         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)&ro->ro_dst);
3426         SCTP_IPI_ADDR_RLOCK();
3427         if (inp->sctp_flags & SCTP_PCB_FLAGS_BOUNDALL) {
3428                 /*
3429                  * Bound all case
3430                  */
3431                 answer = sctp_choose_boundall(inp, stcb, net, ro, vrf_id,
3432                     dest_is_priv, dest_is_loop,
3433                     non_asoc_addr_ok, fam);
3434                 SCTP_IPI_ADDR_RUNLOCK();
3435                 return (answer);
3436         }
3437         /*
3438          * Subset bound case
3439          */
3440         if (stcb) {
3441                 answer = sctp_choose_boundspecific_stcb(inp, stcb, ro,
3442                     vrf_id, dest_is_priv,
3443                     dest_is_loop,
3444                     non_asoc_addr_ok, fam);
3445         } else {
3446                 answer = sctp_choose_boundspecific_inp(inp, ro, vrf_id,
3447                     non_asoc_addr_ok,
3448                     dest_is_priv,
3449                     dest_is_loop, fam);
3450         }
3451         SCTP_IPI_ADDR_RUNLOCK();
3452         return (answer);
3453 }
3454
3455 static bool
3456 sctp_find_cmsg(int c_type, void *data, struct mbuf *control, size_t cpsize)
3457 {
3458         struct cmsghdr cmh;
3459         struct sctp_sndinfo sndinfo;
3460         struct sctp_prinfo prinfo;
3461         struct sctp_authinfo authinfo;
3462         int tot_len, rem_len, cmsg_data_len, cmsg_data_off, off;
3463         bool found;
3464
3465         /*
3466          * Independent of how many mbufs, find the c_type inside the control
3467          * structure and copy out the data.
3468          */
3469         found = false;
3470         tot_len = SCTP_BUF_LEN(control);
3471         for (off = 0; off < tot_len; off += CMSG_ALIGN(cmh.cmsg_len)) {
3472                 rem_len = tot_len - off;
3473                 if (rem_len < (int)CMSG_ALIGN(sizeof(cmh))) {
3474                         /* There is not enough room for one more. */
3475                         return (found);
3476                 }
3477                 m_copydata(control, off, sizeof(cmh), (caddr_t)&cmh);
3478                 if (cmh.cmsg_len < CMSG_ALIGN(sizeof(cmh))) {
3479                         /* We dont't have a complete CMSG header. */
3480                         return (found);
3481                 }
3482                 if ((cmh.cmsg_len > INT_MAX) || ((int)cmh.cmsg_len > rem_len)) {
3483                         /* We don't have the complete CMSG. */
3484                         return (found);
3485                 }
3486                 cmsg_data_len = (int)cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh));
3487                 cmsg_data_off = off + CMSG_ALIGN(sizeof(cmh));
3488                 if ((cmh.cmsg_level == IPPROTO_SCTP) &&
3489                     ((c_type == cmh.cmsg_type) ||
3490                     ((c_type == SCTP_SNDRCV) &&
3491                     ((cmh.cmsg_type == SCTP_SNDINFO) ||
3492                     (cmh.cmsg_type == SCTP_PRINFO) ||
3493                     (cmh.cmsg_type == SCTP_AUTHINFO))))) {
3494                         if (c_type == cmh.cmsg_type) {
3495                                 if (cpsize > INT_MAX) {
3496                                         return (found);
3497                                 }
3498                                 if (cmsg_data_len < (int)cpsize) {
3499                                         return (found);
3500                                 }
3501                                 /* It is exactly what we want. Copy it out. */
3502                                 m_copydata(control, cmsg_data_off, (int)cpsize, (caddr_t)data);
3503                                 return (1);
3504                         } else {
3505                                 struct sctp_sndrcvinfo *sndrcvinfo;
3506
3507                                 sndrcvinfo = (struct sctp_sndrcvinfo *)data;
3508                                 if (!found) {
3509                                         if (cpsize < sizeof(struct sctp_sndrcvinfo)) {
3510                                                 return (found);
3511                                         }
3512                                         memset(sndrcvinfo, 0, sizeof(struct sctp_sndrcvinfo));
3513                                 }
3514                                 switch (cmh.cmsg_type) {
3515                                 case SCTP_SNDINFO:
3516                                         if (cmsg_data_len < (int)sizeof(struct sctp_sndinfo)) {
3517                                                 return (found);
3518                                         }
3519                                         m_copydata(control, cmsg_data_off, sizeof(struct sctp_sndinfo), (caddr_t)&sndinfo);
3520                                         sndrcvinfo->sinfo_stream = sndinfo.snd_sid;
3521                                         sndrcvinfo->sinfo_flags = sndinfo.snd_flags;
3522                                         sndrcvinfo->sinfo_ppid = sndinfo.snd_ppid;
3523                                         sndrcvinfo->sinfo_context = sndinfo.snd_context;
3524                                         sndrcvinfo->sinfo_assoc_id = sndinfo.snd_assoc_id;
3525                                         break;
3526                                 case SCTP_PRINFO:
3527                                         if (cmsg_data_len < (int)sizeof(struct sctp_prinfo)) {
3528                                                 return (found);
3529                                         }
3530                                         m_copydata(control, cmsg_data_off, sizeof(struct sctp_prinfo), (caddr_t)&prinfo);
3531                                         if (prinfo.pr_policy != SCTP_PR_SCTP_NONE) {
3532                                                 sndrcvinfo->sinfo_timetolive = prinfo.pr_value;
3533                                         } else {
3534                                                 sndrcvinfo->sinfo_timetolive = 0;
3535                                         }
3536                                         sndrcvinfo->sinfo_flags |= prinfo.pr_policy;
3537                                         break;
3538                                 case SCTP_AUTHINFO:
3539                                         if (cmsg_data_len < (int)sizeof(struct sctp_authinfo)) {
3540                                                 return (found);
3541                                         }
3542                                         m_copydata(control, cmsg_data_off, sizeof(struct sctp_authinfo), (caddr_t)&authinfo);
3543                                         sndrcvinfo->sinfo_keynumber_valid = 1;
3544                                         sndrcvinfo->sinfo_keynumber = authinfo.auth_keynumber;
3545                                         break;
3546                                 default:
3547                                         return (found);
3548                                 }
3549                                 found = true;
3550                         }
3551                 }
3552         }
3553         return (found);
3554 }
3555
3556 static int
3557 sctp_process_cmsgs_for_init(struct sctp_tcb *stcb, struct mbuf *control, int *error)
3558 {
3559         struct cmsghdr cmh;
3560         struct sctp_initmsg initmsg;
3561 #ifdef INET
3562         struct sockaddr_in sin;
3563 #endif
3564 #ifdef INET6
3565         struct sockaddr_in6 sin6;
3566 #endif
3567         int tot_len, rem_len, cmsg_data_len, cmsg_data_off, off;
3568
3569         tot_len = SCTP_BUF_LEN(control);
3570         for (off = 0; off < tot_len; off += CMSG_ALIGN(cmh.cmsg_len)) {
3571                 rem_len = tot_len - off;
3572                 if (rem_len < (int)CMSG_ALIGN(sizeof(cmh))) {
3573                         /* There is not enough room for one more. */
3574                         *error = EINVAL;
3575                         return (1);
3576                 }
3577                 m_copydata(control, off, sizeof(cmh), (caddr_t)&cmh);
3578                 if (cmh.cmsg_len < CMSG_ALIGN(sizeof(cmh))) {
3579                         /* We dont't have a complete CMSG header. */
3580                         *error = EINVAL;
3581                         return (1);
3582                 }
3583                 if ((cmh.cmsg_len > INT_MAX) || ((int)cmh.cmsg_len > rem_len)) {
3584                         /* We don't have the complete CMSG. */
3585                         *error = EINVAL;
3586                         return (1);
3587                 }
3588                 cmsg_data_len = (int)cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh));
3589                 cmsg_data_off = off + CMSG_ALIGN(sizeof(cmh));
3590                 if (cmh.cmsg_level == IPPROTO_SCTP) {
3591                         switch (cmh.cmsg_type) {
3592                         case SCTP_INIT:
3593                                 if (cmsg_data_len < (int)sizeof(struct sctp_initmsg)) {
3594                                         *error = EINVAL;
3595                                         return (1);
3596                                 }
3597                                 m_copydata(control, cmsg_data_off, sizeof(struct sctp_initmsg), (caddr_t)&initmsg);
3598                                 if (initmsg.sinit_max_attempts)
3599                                         stcb->asoc.max_init_times = initmsg.sinit_max_attempts;
3600                                 if (initmsg.sinit_num_ostreams)
3601                                         stcb->asoc.pre_open_streams = initmsg.sinit_num_ostreams;
3602                                 if (initmsg.sinit_max_instreams)
3603                                         stcb->asoc.max_inbound_streams = initmsg.sinit_max_instreams;
3604                                 if (initmsg.sinit_max_init_timeo)
3605                                         stcb->asoc.initial_init_rto_max = initmsg.sinit_max_init_timeo;
3606                                 if (stcb->asoc.streamoutcnt < stcb->asoc.pre_open_streams) {
3607                                         struct sctp_stream_out *tmp_str;
3608                                         unsigned int i;
3609 #if defined(SCTP_DETAILED_STR_STATS)
3610                                         int j;
3611 #endif
3612
3613                                         /* Default is NOT correct */
3614                                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Ok, default:%d pre_open:%d\n",
3615                                             stcb->asoc.streamoutcnt, stcb->asoc.pre_open_streams);
3616                                         SCTP_TCB_UNLOCK(stcb);
3617                                         SCTP_MALLOC(tmp_str,
3618                                             struct sctp_stream_out *,
3619                                             (stcb->asoc.pre_open_streams * sizeof(struct sctp_stream_out)),
3620                                             SCTP_M_STRMO);
3621                                         SCTP_TCB_LOCK(stcb);
3622                                         if (tmp_str != NULL) {
3623                                                 SCTP_FREE(stcb->asoc.strmout, SCTP_M_STRMO);
3624                                                 stcb->asoc.strmout = tmp_str;
3625                                                 stcb->asoc.strm_realoutsize = stcb->asoc.streamoutcnt = stcb->asoc.pre_open_streams;
3626                                         } else {
3627                                                 stcb->asoc.pre_open_streams = stcb->asoc.streamoutcnt;
3628                                         }
3629                                         for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
3630                                                 TAILQ_INIT(&stcb->asoc.strmout[i].outqueue);
3631                                                 stcb->asoc.ss_functions.sctp_ss_init_stream(stcb, &stcb->asoc.strmout[i], NULL);
3632                                                 stcb->asoc.strmout[i].chunks_on_queues = 0;
3633 #if defined(SCTP_DETAILED_STR_STATS)
3634                                                 for (j = 0; j < SCTP_PR_SCTP_MAX + 1; j++) {
3635                                                         stcb->asoc.strmout[i].abandoned_sent[j] = 0;
3636                                                         stcb->asoc.strmout[i].abandoned_unsent[j] = 0;
3637                                                 }
3638 #else
3639                                                 stcb->asoc.strmout[i].abandoned_sent[0] = 0;
3640                                                 stcb->asoc.strmout[i].abandoned_unsent[0] = 0;
3641 #endif
3642                                                 stcb->asoc.strmout[i].next_mid_ordered = 0;
3643                                                 stcb->asoc.strmout[i].next_mid_unordered = 0;
3644                                                 stcb->asoc.strmout[i].sid = i;
3645                                                 stcb->asoc.strmout[i].last_msg_incomplete = 0;
3646                                                 stcb->asoc.strmout[i].state = SCTP_STREAM_OPENING;
3647                                         }
3648                                 }
3649                                 break;
3650 #ifdef INET
3651                         case SCTP_DSTADDRV4:
3652                                 if (cmsg_data_len < (int)sizeof(struct in_addr)) {
3653                                         *error = EINVAL;
3654                                         return (1);
3655                                 }
3656                                 memset(&sin, 0, sizeof(struct sockaddr_in));
3657                                 sin.sin_family = AF_INET;
3658                                 sin.sin_len = sizeof(struct sockaddr_in);
3659                                 sin.sin_port = stcb->rport;
3660                                 m_copydata(control, cmsg_data_off, sizeof(struct in_addr), (caddr_t)&sin.sin_addr);
3661                                 if ((sin.sin_addr.s_addr == INADDR_ANY) ||
3662                                     (sin.sin_addr.s_addr == INADDR_BROADCAST) ||
3663                                     IN_MULTICAST(ntohl(sin.sin_addr.s_addr))) {
3664                                         *error = EINVAL;
3665                                         return (1);
3666                                 }
3667                                 if (sctp_add_remote_addr(stcb, (struct sockaddr *)&sin, NULL, stcb->asoc.port,
3668                                     SCTP_DONOT_SETSCOPE, SCTP_ADDR_IS_CONFIRMED)) {
3669                                         *error = ENOBUFS;
3670                                         return (1);
3671                                 }
3672                                 break;
3673 #endif
3674 #ifdef INET6
3675                         case SCTP_DSTADDRV6:
3676                                 if (cmsg_data_len < (int)sizeof(struct in6_addr)) {
3677                                         *error = EINVAL;
3678                                         return (1);
3679                                 }
3680                                 memset(&sin6, 0, sizeof(struct sockaddr_in6));
3681                                 sin6.sin6_family = AF_INET6;
3682                                 sin6.sin6_len = sizeof(struct sockaddr_in6);
3683                                 sin6.sin6_port = stcb->rport;
3684                                 m_copydata(control, cmsg_data_off, sizeof(struct in6_addr), (caddr_t)&sin6.sin6_addr);
3685                                 if (IN6_IS_ADDR_UNSPECIFIED(&sin6.sin6_addr) ||
3686                                     IN6_IS_ADDR_MULTICAST(&sin6.sin6_addr)) {
3687                                         *error = EINVAL;
3688                                         return (1);
3689                                 }
3690 #ifdef INET
3691                                 if (IN6_IS_ADDR_V4MAPPED(&sin6.sin6_addr)) {
3692                                         in6_sin6_2_sin(&sin, &sin6);
3693                                         if ((sin.sin_addr.s_addr == INADDR_ANY) ||
3694                                             (sin.sin_addr.s_addr == INADDR_BROADCAST) ||
3695                                             IN_MULTICAST(ntohl(sin.sin_addr.s_addr))) {
3696                                                 *error = EINVAL;
3697                                                 return (1);
3698                                         }
3699                                         if (sctp_add_remote_addr(stcb, (struct sockaddr *)&sin, NULL, stcb->asoc.port,
3700                                             SCTP_DONOT_SETSCOPE, SCTP_ADDR_IS_CONFIRMED)) {
3701                                                 *error = ENOBUFS;
3702                                                 return (1);
3703                                         }
3704                                 } else
3705 #endif
3706                                         if (sctp_add_remote_addr(stcb, (struct sockaddr *)&sin6, NULL, stcb->asoc.port,
3707                                     SCTP_DONOT_SETSCOPE, SCTP_ADDR_IS_CONFIRMED)) {
3708                                         *error = ENOBUFS;
3709                                         return (1);
3710                                 }
3711                                 break;
3712 #endif
3713                         default:
3714                                 break;
3715                         }
3716                 }
3717         }
3718         return (0);
3719 }
3720
3721 #if defined(INET) || defined(INET6)
3722 static struct sctp_tcb *
3723 sctp_findassociation_cmsgs(struct sctp_inpcb **inp_p,
3724     uint16_t port,
3725     struct mbuf *control,
3726     struct sctp_nets **net_p,
3727     int *error)
3728 {
3729         struct cmsghdr cmh;
3730         struct sctp_tcb *stcb;
3731         struct sockaddr *addr;
3732 #ifdef INET
3733         struct sockaddr_in sin;
3734 #endif
3735 #ifdef INET6
3736         struct sockaddr_in6 sin6;
3737 #endif
3738         int tot_len, rem_len, cmsg_data_len, cmsg_data_off, off;
3739
3740         tot_len = SCTP_BUF_LEN(control);
3741         for (off = 0; off < tot_len; off += CMSG_ALIGN(cmh.cmsg_len)) {
3742                 rem_len = tot_len - off;
3743                 if (rem_len < (int)CMSG_ALIGN(sizeof(cmh))) {
3744                         /* There is not enough room for one more. */
3745                         *error = EINVAL;
3746                         return (NULL);
3747                 }
3748                 m_copydata(control, off, sizeof(cmh), (caddr_t)&cmh);
3749                 if (cmh.cmsg_len < CMSG_ALIGN(sizeof(cmh))) {
3750                         /* We dont't have a complete CMSG header. */
3751                         *error = EINVAL;
3752                         return (NULL);
3753                 }
3754                 if ((cmh.cmsg_len > INT_MAX) || ((int)cmh.cmsg_len > rem_len)) {
3755                         /* We don't have the complete CMSG. */
3756                         *error = EINVAL;
3757                         return (NULL);
3758                 }
3759                 cmsg_data_len = (int)cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh));
3760                 cmsg_data_off = off + CMSG_ALIGN(sizeof(cmh));
3761                 if (cmh.cmsg_level == IPPROTO_SCTP) {
3762                         switch (cmh.cmsg_type) {
3763 #ifdef INET
3764                         case SCTP_DSTADDRV4:
3765                                 if (cmsg_data_len < (int)sizeof(struct in_addr)) {
3766                                         *error = EINVAL;
3767                                         return (NULL);
3768                                 }
3769                                 memset(&sin, 0, sizeof(struct sockaddr_in));
3770                                 sin.sin_family = AF_INET;
3771                                 sin.sin_len = sizeof(struct sockaddr_in);
3772                                 sin.sin_port = port;
3773                                 m_copydata(control, cmsg_data_off, sizeof(struct in_addr), (caddr_t)&sin.sin_addr);
3774                                 addr = (struct sockaddr *)&sin;
3775                                 break;
3776 #endif
3777 #ifdef INET6
3778                         case SCTP_DSTADDRV6:
3779                                 if (cmsg_data_len < (int)sizeof(struct in6_addr)) {
3780                                         *error = EINVAL;
3781                                         return (NULL);
3782                                 }
3783                                 memset(&sin6, 0, sizeof(struct sockaddr_in6));
3784                                 sin6.sin6_family = AF_INET6;
3785                                 sin6.sin6_len = sizeof(struct sockaddr_in6);
3786                                 sin6.sin6_port = port;
3787                                 m_copydata(control, cmsg_data_off, sizeof(struct in6_addr), (caddr_t)&sin6.sin6_addr);
3788 #ifdef INET
3789                                 if (IN6_IS_ADDR_V4MAPPED(&sin6.sin6_addr)) {
3790                                         in6_sin6_2_sin(&sin, &sin6);
3791                                         addr = (struct sockaddr *)&sin;
3792                                 } else
3793 #endif
3794                                         addr = (struct sockaddr *)&sin6;
3795                                 break;
3796 #endif
3797                         default:
3798                                 addr = NULL;
3799                                 break;
3800                         }
3801                         if (addr) {
3802                                 stcb = sctp_findassociation_ep_addr(inp_p, addr, net_p, NULL, NULL);
3803                                 if (stcb != NULL) {
3804                                         return (stcb);
3805                                 }
3806                         }
3807                 }
3808         }
3809         return (NULL);
3810 }
3811 #endif
3812
3813 static struct mbuf *
3814 sctp_add_cookie(struct mbuf *init, int init_offset,
3815     struct mbuf *initack, int initack_offset, struct sctp_state_cookie *stc_in, uint8_t **signature)
3816 {
3817         struct mbuf *copy_init, *copy_initack, *m_at, *sig, *mret;
3818         struct sctp_state_cookie *stc;
3819         struct sctp_paramhdr *ph;
3820         uint16_t cookie_sz;
3821
3822         mret = sctp_get_mbuf_for_msg((sizeof(struct sctp_state_cookie) +
3823             sizeof(struct sctp_paramhdr)), 0,
3824             M_NOWAIT, 1, MT_DATA);
3825         if (mret == NULL) {
3826                 return (NULL);
3827         }
3828         copy_init = SCTP_M_COPYM(init, init_offset, M_COPYALL, M_NOWAIT);
3829         if (copy_init == NULL) {
3830                 sctp_m_freem(mret);
3831                 return (NULL);
3832         }
3833 #ifdef SCTP_MBUF_LOGGING
3834         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
3835                 sctp_log_mbc(copy_init, SCTP_MBUF_ICOPY);
3836         }
3837 #endif
3838         copy_initack = SCTP_M_COPYM(initack, initack_offset, M_COPYALL,
3839             M_NOWAIT);
3840         if (copy_initack == NULL) {
3841                 sctp_m_freem(mret);
3842                 sctp_m_freem(copy_init);
3843                 return (NULL);
3844         }
3845 #ifdef SCTP_MBUF_LOGGING
3846         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
3847                 sctp_log_mbc(copy_initack, SCTP_MBUF_ICOPY);
3848         }
3849 #endif
3850         /* easy side we just drop it on the end */
3851         ph = mtod(mret, struct sctp_paramhdr *);
3852         SCTP_BUF_LEN(mret) = sizeof(struct sctp_state_cookie) +
3853             sizeof(struct sctp_paramhdr);
3854         stc = (struct sctp_state_cookie *)((caddr_t)ph +
3855             sizeof(struct sctp_paramhdr));
3856         ph->param_type = htons(SCTP_STATE_COOKIE);
3857         ph->param_length = 0;   /* fill in at the end */
3858         /* Fill in the stc cookie data */
3859         memcpy(stc, stc_in, sizeof(struct sctp_state_cookie));
3860
3861         /* tack the INIT and then the INIT-ACK onto the chain */
3862         cookie_sz = 0;
3863         for (m_at = mret; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
3864                 cookie_sz += SCTP_BUF_LEN(m_at);
3865                 if (SCTP_BUF_NEXT(m_at) == NULL) {
3866                         SCTP_BUF_NEXT(m_at) = copy_init;
3867                         break;
3868                 }
3869         }
3870         for (m_at = copy_init; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
3871                 cookie_sz += SCTP_BUF_LEN(m_at);
3872                 if (SCTP_BUF_NEXT(m_at) == NULL) {
3873                         SCTP_BUF_NEXT(m_at) = copy_initack;
3874                         break;
3875                 }
3876         }
3877         for (m_at = copy_initack; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
3878                 cookie_sz += SCTP_BUF_LEN(m_at);
3879                 if (SCTP_BUF_NEXT(m_at) == NULL) {
3880                         break;
3881                 }
3882         }
3883         sig = sctp_get_mbuf_for_msg(SCTP_SIGNATURE_SIZE, 0, M_NOWAIT, 1, MT_DATA);
3884         if (sig == NULL) {
3885                 /* no space, so free the entire chain */
3886                 sctp_m_freem(mret);
3887                 return (NULL);
3888         }
3889         SCTP_BUF_NEXT(m_at) = sig;
3890         SCTP_BUF_LEN(sig) = SCTP_SIGNATURE_SIZE;
3891         cookie_sz += SCTP_SIGNATURE_SIZE;
3892         ph->param_length = htons(cookie_sz);
3893         *signature = (uint8_t *)mtod(sig, caddr_t);
3894         memset(*signature, 0, SCTP_SIGNATURE_SIZE);
3895         return (mret);
3896 }
3897
3898 static uint8_t
3899 sctp_get_ect(struct sctp_tcb *stcb)
3900 {
3901         if ((stcb != NULL) && (stcb->asoc.ecn_supported == 1)) {
3902                 return (SCTP_ECT0_BIT);
3903         } else {
3904                 return (0);
3905         }
3906 }
3907
3908 #if defined(INET) || defined(INET6)
3909 static void
3910 sctp_handle_no_route(struct sctp_tcb *stcb,
3911     struct sctp_nets *net,
3912     int so_locked)
3913 {
3914         SCTPDBG(SCTP_DEBUG_OUTPUT1, "dropped packet - no valid source addr\n");
3915
3916         if (net) {
3917                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Destination was ");
3918                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT1, &net->ro._l_addr.sa);
3919                 if (net->dest_state & SCTP_ADDR_CONFIRMED) {
3920                         if ((net->dest_state & SCTP_ADDR_REACHABLE) && stcb) {
3921                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "no route takes interface %p down\n", (void *)net);
3922                                 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_DOWN,
3923                                     stcb, 0,
3924                                     (void *)net,
3925                                     so_locked);
3926                                 net->dest_state &= ~SCTP_ADDR_REACHABLE;
3927                                 net->dest_state &= ~SCTP_ADDR_PF;
3928                         }
3929                 }
3930                 if (stcb) {
3931                         if (net == stcb->asoc.primary_destination) {
3932                                 /* need a new primary */
3933                                 struct sctp_nets *alt;
3934
3935                                 alt = sctp_find_alternate_net(stcb, net, 0);
3936                                 if (alt != net) {
3937                                         if (stcb->asoc.alternate) {
3938                                                 sctp_free_remote_addr(stcb->asoc.alternate);
3939                                         }
3940                                         stcb->asoc.alternate = alt;
3941                                         atomic_add_int(&stcb->asoc.alternate->ref_count, 1);
3942                                         if (net->ro._s_addr) {
3943                                                 sctp_free_ifa(net->ro._s_addr);
3944                                                 net->ro._s_addr = NULL;
3945                                         }
3946                                         net->src_addr_selected = 0;
3947                                 }
3948                         }
3949                 }
3950         }
3951 }
3952 #endif
3953
3954 static int
3955 sctp_lowlevel_chunk_output(struct sctp_inpcb *inp,
3956     struct sctp_tcb *stcb,      /* may be NULL */
3957     struct sctp_nets *net,
3958     struct sockaddr *to,
3959     struct mbuf *m,
3960     uint32_t auth_offset,
3961     struct sctp_auth_chunk *auth,
3962     uint16_t auth_keyid,
3963     int nofragment_flag,
3964     int ecn_ok,
3965     int out_of_asoc_ok,
3966     uint16_t src_port,
3967     uint16_t dest_port,
3968     uint32_t v_tag,
3969     uint16_t port,
3970     union sctp_sockstore *over_addr,
3971     uint8_t mflowtype, uint32_t mflowid,
3972     int so_locked)
3973 {
3974 /* nofragment_flag to tell if IP_DF should be set (IPv4 only) */
3975         /**
3976          * Given a mbuf chain (via SCTP_BUF_NEXT()) that holds a packet header
3977          * WITH an SCTPHDR but no IP header, endpoint inp and sa structure:
3978          * - fill in the HMAC digest of any AUTH chunk in the packet.
3979          * - calculate and fill in the SCTP checksum.
3980          * - prepend an IP address header.
3981          * - if boundall use INADDR_ANY.
3982          * - if boundspecific do source address selection.
3983          * - set fragmentation option for ipV4.
3984          * - On return from IP output, check/adjust mtu size of output
3985          *   interface and smallest_mtu size as well.
3986          */
3987         /* Will need ifdefs around this */
3988         struct mbuf *newm;
3989         struct sctphdr *sctphdr;
3990         int packet_length;
3991         int ret;
3992 #if defined(INET) || defined(INET6)
3993         uint32_t vrf_id;
3994 #endif
3995 #if defined(INET) || defined(INET6)
3996         struct mbuf *o_pak;
3997         sctp_route_t *ro = NULL;
3998         struct udphdr *udp = NULL;
3999 #endif
4000         uint8_t tos_value;
4001
4002         if ((net) && (net->dest_state & SCTP_ADDR_OUT_OF_SCOPE)) {
4003                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EFAULT);
4004                 sctp_m_freem(m);
4005                 return (EFAULT);
4006         }
4007 #if defined(INET) || defined(INET6)
4008         if (stcb) {
4009                 vrf_id = stcb->asoc.vrf_id;
4010         } else {
4011                 vrf_id = inp->def_vrf_id;
4012         }
4013 #endif
4014         /* fill in the HMAC digest for any AUTH chunk in the packet */
4015         if ((auth != NULL) && (stcb != NULL)) {
4016                 sctp_fill_hmac_digest_m(m, auth_offset, auth, stcb, auth_keyid);
4017         }
4018
4019         if (net) {
4020                 tos_value = net->dscp;
4021         } else if (stcb) {
4022                 tos_value = stcb->asoc.default_dscp;
4023         } else {
4024                 tos_value = inp->sctp_ep.default_dscp;
4025         }
4026
4027         switch (to->sa_family) {
4028 #ifdef INET
4029         case AF_INET:
4030                 {
4031                         struct ip *ip = NULL;
4032                         sctp_route_t iproute;
4033                         int len;
4034
4035                         len = SCTP_MIN_V4_OVERHEAD;
4036                         if (port) {
4037                                 len += sizeof(struct udphdr);
4038                         }
4039                         newm = sctp_get_mbuf_for_msg(len, 1, M_NOWAIT, 1, MT_DATA);
4040                         if (newm == NULL) {
4041                                 sctp_m_freem(m);
4042                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
4043                                 return (ENOMEM);
4044                         }
4045                         SCTP_ALIGN_TO_END(newm, len);
4046                         SCTP_BUF_LEN(newm) = len;
4047                         SCTP_BUF_NEXT(newm) = m;
4048                         m = newm;
4049                         if (net != NULL) {
4050                                 m->m_pkthdr.flowid = net->flowid;
4051                                 M_HASHTYPE_SET(m, net->flowtype);
4052                         } else {
4053                                 m->m_pkthdr.flowid = mflowid;
4054                                 M_HASHTYPE_SET(m, mflowtype);
4055                         }
4056                         packet_length = sctp_calculate_len(m);
4057                         ip = mtod(m, struct ip *);
4058                         ip->ip_v = IPVERSION;
4059                         ip->ip_hl = (sizeof(struct ip) >> 2);
4060                         if (tos_value == 0) {
4061                                 /*
4062                                  * This means especially, that it is not set
4063                                  * at the SCTP layer. So use the value from
4064                                  * the IP layer.
4065                                  */
4066                                 tos_value = inp->ip_inp.inp.inp_ip_tos;
4067                         }
4068                         tos_value &= 0xfc;
4069                         if (ecn_ok) {
4070                                 tos_value |= sctp_get_ect(stcb);
4071                         }
4072                         if ((nofragment_flag) && (port == 0)) {
4073                                 ip->ip_off = htons(IP_DF);
4074                         } else {
4075                                 ip->ip_off = htons(0);
4076                         }
4077                         /* FreeBSD has a function for ip_id's */
4078                         ip_fillid(ip);
4079
4080                         ip->ip_ttl = inp->ip_inp.inp.inp_ip_ttl;
4081                         ip->ip_len = htons(packet_length);
4082                         ip->ip_tos = tos_value;
4083                         if (port) {
4084                                 ip->ip_p = IPPROTO_UDP;
4085                         } else {
4086                                 ip->ip_p = IPPROTO_SCTP;
4087                         }
4088                         ip->ip_sum = 0;
4089                         if (net == NULL) {
4090                                 ro = &iproute;
4091                                 memset(&iproute, 0, sizeof(iproute));
4092                                 memcpy(&ro->ro_dst, to, to->sa_len);
4093                         } else {
4094                                 ro = (sctp_route_t *)&net->ro;
4095                         }
4096                         /* Now the address selection part */
4097                         ip->ip_dst.s_addr = ((struct sockaddr_in *)to)->sin_addr.s_addr;
4098
4099                         /* call the routine to select the src address */
4100                         if (net && out_of_asoc_ok == 0) {
4101                                 if (net->ro._s_addr && (net->ro._s_addr->localifa_flags & (SCTP_BEING_DELETED | SCTP_ADDR_IFA_UNUSEABLE))) {
4102                                         sctp_free_ifa(net->ro._s_addr);
4103                                         net->ro._s_addr = NULL;
4104                                         net->src_addr_selected = 0;
4105                                         RO_NHFREE(ro);
4106                                 }
4107                                 if (net->src_addr_selected == 0) {
4108                                         /* Cache the source address */
4109                                         net->ro._s_addr = sctp_source_address_selection(inp, stcb,
4110                                             ro, net, 0,
4111                                             vrf_id);
4112                                         net->src_addr_selected = 1;
4113                                 }
4114                                 if (net->ro._s_addr == NULL) {
4115                                         /* No route to host */
4116                                         net->src_addr_selected = 0;
4117                                         sctp_handle_no_route(stcb, net, so_locked);
4118                                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4119                                         sctp_m_freem(m);
4120                                         return (EHOSTUNREACH);
4121                                 }
4122                                 ip->ip_src = net->ro._s_addr->address.sin.sin_addr;
4123                         } else {
4124                                 if (over_addr == NULL) {
4125                                         struct sctp_ifa *_lsrc;
4126
4127                                         _lsrc = sctp_source_address_selection(inp, stcb, ro,
4128                                             net,
4129                                             out_of_asoc_ok,
4130                                             vrf_id);
4131                                         if (_lsrc == NULL) {
4132                                                 sctp_handle_no_route(stcb, net, so_locked);
4133                                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4134                                                 sctp_m_freem(m);
4135                                                 return (EHOSTUNREACH);
4136                                         }
4137                                         ip->ip_src = _lsrc->address.sin.sin_addr;
4138                                         sctp_free_ifa(_lsrc);
4139                                 } else {
4140                                         ip->ip_src = over_addr->sin.sin_addr;
4141                                         SCTP_RTALLOC(ro, vrf_id, inp->fibnum);
4142                                 }
4143                         }
4144                         if (port) {
4145                                 if (htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port)) == 0) {
4146                                         sctp_handle_no_route(stcb, net, so_locked);
4147                                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4148                                         sctp_m_freem(m);
4149                                         return (EHOSTUNREACH);
4150                                 }
4151                                 udp = (struct udphdr *)((caddr_t)ip + sizeof(struct ip));
4152                                 udp->uh_sport = htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port));
4153                                 udp->uh_dport = port;
4154                                 udp->uh_ulen = htons((uint16_t)(packet_length - sizeof(struct ip)));
4155                                 if (V_udp_cksum) {
4156                                         udp->uh_sum = in_pseudo(ip->ip_src.s_addr, ip->ip_dst.s_addr, udp->uh_ulen + htons(IPPROTO_UDP));
4157                                 } else {
4158                                         udp->uh_sum = 0;
4159                                 }
4160                                 sctphdr = (struct sctphdr *)((caddr_t)udp + sizeof(struct udphdr));
4161                         } else {
4162                                 sctphdr = (struct sctphdr *)((caddr_t)ip + sizeof(struct ip));
4163                         }
4164
4165                         sctphdr->src_port = src_port;
4166                         sctphdr->dest_port = dest_port;
4167                         sctphdr->v_tag = v_tag;
4168                         sctphdr->checksum = 0;
4169
4170                         /*
4171                          * If source address selection fails and we find no
4172                          * route then the ip_output should fail as well with
4173                          * a NO_ROUTE_TO_HOST type error. We probably should
4174                          * catch that somewhere and abort the association
4175                          * right away (assuming this is an INIT being sent).
4176                          */
4177                         if (ro->ro_nh == NULL) {
4178                                 /*
4179                                  * src addr selection failed to find a route
4180                                  * (or valid source addr), so we can't get
4181                                  * there from here (yet)!
4182                                  */
4183                                 sctp_handle_no_route(stcb, net, so_locked);
4184                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4185                                 sctp_m_freem(m);
4186                                 return (EHOSTUNREACH);
4187                         }
4188                         if (ro != &iproute) {
4189                                 memcpy(&iproute, ro, sizeof(*ro));
4190                         }
4191                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "Calling ipv4 output routine from low level src addr:%x\n",
4192                             (uint32_t)(ntohl(ip->ip_src.s_addr)));
4193                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "Destination is %x\n",
4194                             (uint32_t)(ntohl(ip->ip_dst.s_addr)));
4195                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "RTP route is %p through\n",
4196                             (void *)ro->ro_nh);
4197
4198                         if (SCTP_GET_HEADER_FOR_OUTPUT(o_pak)) {
4199                                 /* failed to prepend data, give up */
4200                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
4201                                 sctp_m_freem(m);
4202                                 return (ENOMEM);
4203                         }
4204                         SCTP_ATTACH_CHAIN(o_pak, m, packet_length);
4205                         if (port) {
4206                                 sctphdr->checksum = sctp_calculate_cksum(m, sizeof(struct ip) + sizeof(struct udphdr));
4207                                 SCTP_STAT_INCR(sctps_sendswcrc);
4208                                 if (V_udp_cksum) {
4209                                         SCTP_ENABLE_UDP_CSUM(o_pak);
4210                                 }
4211                         } else {
4212                                 m->m_pkthdr.csum_flags = CSUM_SCTP;
4213                                 m->m_pkthdr.csum_data = offsetof(struct sctphdr, checksum);
4214                                 SCTP_STAT_INCR(sctps_sendhwcrc);
4215                         }
4216 #ifdef SCTP_PACKET_LOGGING
4217                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING)
4218                                 sctp_packet_log(o_pak);
4219 #endif
4220                         /* send it out.  table id is taken from stcb */
4221                         SCTP_PROBE5(send, NULL, stcb, ip, stcb, sctphdr);
4222                         SCTP_IP_OUTPUT(ret, o_pak, ro, inp, vrf_id);
4223                         if (port) {
4224                                 UDPSTAT_INC(udps_opackets);
4225                         }
4226                         SCTP_STAT_INCR(sctps_sendpackets);
4227                         SCTP_STAT_INCR_COUNTER64(sctps_outpackets);
4228                         if (ret)
4229                                 SCTP_STAT_INCR(sctps_senderrors);
4230
4231                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "IP output returns %d\n", ret);
4232                         if (net == NULL) {
4233                                 /* free tempy routes */
4234                                 RO_NHFREE(ro);
4235                         } else {
4236                                 if ((ro->ro_nh != NULL) && (net->ro._s_addr) &&
4237                                     ((net->dest_state & SCTP_ADDR_NO_PMTUD) == 0)) {
4238                                         uint32_t mtu;
4239
4240                                         mtu = SCTP_GATHER_MTU_FROM_ROUTE(net->ro._s_addr, &net->ro._l_addr.sa, ro->ro_nh);
4241                                         if (mtu > 0) {
4242                                                 if (net->port) {
4243                                                         mtu -= sizeof(struct udphdr);
4244                                                 }
4245                                                 if (mtu < net->mtu) {
4246                                                         net->mtu = mtu;
4247                                                         if ((stcb != NULL) && (stcb->asoc.smallest_mtu > mtu)) {
4248                                                                 sctp_pathmtu_adjustment(stcb, mtu, true);
4249                                                         }
4250                                                 }
4251                                         }
4252                                 } else if (ro->ro_nh == NULL) {
4253                                         /* route was freed */
4254                                         if (net->ro._s_addr &&
4255                                             net->src_addr_selected) {
4256                                                 sctp_free_ifa(net->ro._s_addr);
4257                                                 net->ro._s_addr = NULL;
4258                                         }
4259                                         net->src_addr_selected = 0;
4260                                 }
4261                         }
4262                         return (ret);
4263                 }
4264 #endif
4265 #ifdef INET6
4266         case AF_INET6:
4267                 {
4268                         uint32_t flowlabel, flowinfo;
4269                         struct ip6_hdr *ip6h;
4270                         struct route_in6 ip6route;
4271                         struct ifnet *ifp;
4272                         struct sockaddr_in6 *sin6, tmp, *lsa6, lsa6_tmp;
4273                         int prev_scope = 0;
4274                         struct sockaddr_in6 lsa6_storage;
4275                         int error;
4276                         u_short prev_port = 0;
4277                         int len;
4278
4279                         if (net) {
4280                                 flowlabel = net->flowlabel;
4281                         } else if (stcb) {
4282                                 flowlabel = stcb->asoc.default_flowlabel;
4283                         } else {
4284                                 flowlabel = inp->sctp_ep.default_flowlabel;
4285                         }
4286                         if (flowlabel == 0) {
4287                                 /*
4288                                  * This means especially, that it is not set
4289                                  * at the SCTP layer. So use the value from
4290                                  * the IP layer.
4291                                  */
4292                                 flowlabel = ntohl(((struct inpcb *)inp)->inp_flow);
4293                         }
4294                         flowlabel &= 0x000fffff;
4295                         len = SCTP_MIN_OVERHEAD;
4296                         if (port) {
4297                                 len += sizeof(struct udphdr);
4298                         }
4299                         newm = sctp_get_mbuf_for_msg(len, 1, M_NOWAIT, 1, MT_DATA);
4300                         if (newm == NULL) {
4301                                 sctp_m_freem(m);
4302                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
4303                                 return (ENOMEM);
4304                         }
4305                         SCTP_ALIGN_TO_END(newm, len);
4306                         SCTP_BUF_LEN(newm) = len;
4307                         SCTP_BUF_NEXT(newm) = m;
4308                         m = newm;
4309                         if (net != NULL) {
4310                                 m->m_pkthdr.flowid = net->flowid;
4311                                 M_HASHTYPE_SET(m, net->flowtype);
4312                         } else {
4313                                 m->m_pkthdr.flowid = mflowid;
4314                                 M_HASHTYPE_SET(m, mflowtype);
4315                         }
4316                         packet_length = sctp_calculate_len(m);
4317
4318                         ip6h = mtod(m, struct ip6_hdr *);
4319                         /* protect *sin6 from overwrite */
4320                         sin6 = (struct sockaddr_in6 *)to;
4321                         tmp = *sin6;
4322                         sin6 = &tmp;
4323
4324                         /* KAME hack: embed scopeid */
4325                         if (sa6_embedscope(sin6, MODULE_GLOBAL(ip6_use_defzone)) != 0) {
4326                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
4327                                 sctp_m_freem(m);
4328                                 return (EINVAL);
4329                         }
4330                         if (net == NULL) {
4331                                 memset(&ip6route, 0, sizeof(ip6route));
4332                                 ro = (sctp_route_t *)&ip6route;
4333                                 memcpy(&ro->ro_dst, sin6, sin6->sin6_len);
4334                         } else {
4335                                 ro = (sctp_route_t *)&net->ro;
4336                         }
4337                         /*
4338                          * We assume here that inp_flow is in host byte
4339                          * order within the TCB!
4340                          */
4341                         if (tos_value == 0) {
4342                                 /*
4343                                  * This means especially, that it is not set
4344                                  * at the SCTP layer. So use the value from
4345                                  * the IP layer.
4346                                  */
4347                                 tos_value = (ntohl(((struct inpcb *)inp)->inp_flow) >> 20) & 0xff;
4348                         }
4349                         tos_value &= 0xfc;
4350                         if (ecn_ok) {
4351                                 tos_value |= sctp_get_ect(stcb);
4352                         }
4353                         flowinfo = 0x06;
4354                         flowinfo <<= 8;
4355                         flowinfo |= tos_value;
4356                         flowinfo <<= 20;
4357                         flowinfo |= flowlabel;
4358                         ip6h->ip6_flow = htonl(flowinfo);
4359                         if (port) {
4360                                 ip6h->ip6_nxt = IPPROTO_UDP;
4361                         } else {
4362                                 ip6h->ip6_nxt = IPPROTO_SCTP;
4363                         }
4364                         ip6h->ip6_plen = htons((uint16_t)(packet_length - sizeof(struct ip6_hdr)));
4365                         ip6h->ip6_dst = sin6->sin6_addr;
4366
4367                         /*
4368                          * Add SRC address selection here: we can only reuse
4369                          * to a limited degree the kame src-addr-sel, since
4370                          * we can try their selection but it may not be
4371                          * bound.
4372                          */
4373                         memset(&lsa6_tmp, 0, sizeof(lsa6_tmp));
4374                         lsa6_tmp.sin6_family = AF_INET6;
4375                         lsa6_tmp.sin6_len = sizeof(lsa6_tmp);
4376                         lsa6 = &lsa6_tmp;
4377                         if (net && out_of_asoc_ok == 0) {
4378                                 if (net->ro._s_addr && (net->ro._s_addr->localifa_flags & (SCTP_BEING_DELETED | SCTP_ADDR_IFA_UNUSEABLE))) {
4379                                         sctp_free_ifa(net->ro._s_addr);
4380                                         net->ro._s_addr = NULL;
4381                                         net->src_addr_selected = 0;
4382                                         RO_NHFREE(ro);
4383                                 }
4384                                 if (net->src_addr_selected == 0) {
4385                                         sin6 = (struct sockaddr_in6 *)&net->ro._l_addr;
4386                                         /* KAME hack: embed scopeid */
4387                                         if (sa6_embedscope(sin6, MODULE_GLOBAL(ip6_use_defzone)) != 0) {
4388                                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
4389                                                 sctp_m_freem(m);
4390                                                 return (EINVAL);
4391                                         }
4392                                         /* Cache the source address */
4393                                         net->ro._s_addr = sctp_source_address_selection(inp,
4394                                             stcb,
4395                                             ro,
4396                                             net,
4397                                             0,
4398                                             vrf_id);
4399                                         (void)sa6_recoverscope(sin6);
4400                                         net->src_addr_selected = 1;
4401                                 }
4402                                 if (net->ro._s_addr == NULL) {
4403                                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "V6:No route to host\n");
4404                                         net->src_addr_selected = 0;
4405                                         sctp_handle_no_route(stcb, net, so_locked);
4406                                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4407                                         sctp_m_freem(m);
4408                                         return (EHOSTUNREACH);
4409                                 }
4410                                 lsa6->sin6_addr = net->ro._s_addr->address.sin6.sin6_addr;
4411                         } else {
4412                                 sin6 = (struct sockaddr_in6 *)&ro->ro_dst;
4413                                 /* KAME hack: embed scopeid */
4414                                 if (sa6_embedscope(sin6, MODULE_GLOBAL(ip6_use_defzone)) != 0) {
4415                                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
4416                                         sctp_m_freem(m);
4417                                         return (EINVAL);
4418                                 }
4419                                 if (over_addr == NULL) {
4420                                         struct sctp_ifa *_lsrc;
4421
4422                                         _lsrc = sctp_source_address_selection(inp, stcb, ro,
4423                                             net,
4424                                             out_of_asoc_ok,
4425                                             vrf_id);
4426                                         if (_lsrc == NULL) {
4427                                                 sctp_handle_no_route(stcb, net, so_locked);
4428                                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4429                                                 sctp_m_freem(m);
4430                                                 return (EHOSTUNREACH);
4431                                         }
4432                                         lsa6->sin6_addr = _lsrc->address.sin6.sin6_addr;
4433                                         sctp_free_ifa(_lsrc);
4434                                 } else {
4435                                         lsa6->sin6_addr = over_addr->sin6.sin6_addr;
4436                                         SCTP_RTALLOC(ro, vrf_id, inp->fibnum);
4437                                 }
4438                                 (void)sa6_recoverscope(sin6);
4439                         }
4440                         lsa6->sin6_port = inp->sctp_lport;
4441
4442                         if (ro->ro_nh == NULL) {
4443                                 /*
4444                                  * src addr selection failed to find a route
4445                                  * (or valid source addr), so we can't get
4446                                  * there from here!
4447                                  */
4448                                 sctp_handle_no_route(stcb, net, so_locked);
4449                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4450                                 sctp_m_freem(m);
4451                                 return (EHOSTUNREACH);
4452                         }
4453                         /*
4454                          * XXX: sa6 may not have a valid sin6_scope_id in
4455                          * the non-SCOPEDROUTING case.
4456                          */
4457                         memset(&lsa6_storage, 0, sizeof(lsa6_storage));
4458                         lsa6_storage.sin6_family = AF_INET6;
4459                         lsa6_storage.sin6_len = sizeof(lsa6_storage);
4460                         lsa6_storage.sin6_addr = lsa6->sin6_addr;
4461                         if ((error = sa6_recoverscope(&lsa6_storage)) != 0) {
4462                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "recover scope fails error %d\n", error);
4463                                 sctp_m_freem(m);
4464                                 return (error);
4465                         }
4466                         /* XXX */
4467                         lsa6_storage.sin6_addr = lsa6->sin6_addr;
4468                         lsa6_storage.sin6_port = inp->sctp_lport;
4469                         lsa6 = &lsa6_storage;
4470                         ip6h->ip6_src = lsa6->sin6_addr;
4471
4472                         if (port) {
4473                                 if (htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port)) == 0) {
4474                                         sctp_handle_no_route(stcb, net, so_locked);
4475                                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4476                                         sctp_m_freem(m);
4477                                         return (EHOSTUNREACH);
4478                                 }
4479                                 udp = (struct udphdr *)((caddr_t)ip6h + sizeof(struct ip6_hdr));
4480                                 udp->uh_sport = htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port));
4481                                 udp->uh_dport = port;
4482                                 udp->uh_ulen = htons((uint16_t)(packet_length - sizeof(struct ip6_hdr)));
4483                                 udp->uh_sum = 0;
4484                                 sctphdr = (struct sctphdr *)((caddr_t)udp + sizeof(struct udphdr));
4485                         } else {
4486                                 sctphdr = (struct sctphdr *)((caddr_t)ip6h + sizeof(struct ip6_hdr));
4487                         }
4488
4489                         sctphdr->src_port = src_port;
4490                         sctphdr->dest_port = dest_port;
4491                         sctphdr->v_tag = v_tag;
4492                         sctphdr->checksum = 0;
4493
4494                         /*
4495                          * We set the hop limit now since there is a good
4496                          * chance that our ro pointer is now filled
4497                          */
4498                         ip6h->ip6_hlim = SCTP_GET_HLIM(inp, ro);
4499                         ifp = SCTP_GET_IFN_VOID_FROM_ROUTE(ro);
4500
4501 #ifdef SCTP_DEBUG
4502                         /* Copy to be sure something bad is not happening */
4503                         sin6->sin6_addr = ip6h->ip6_dst;
4504                         lsa6->sin6_addr = ip6h->ip6_src;
4505 #endif
4506
4507                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "Calling ipv6 output routine from low level\n");
4508                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "src: ");
4509                         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT3, (struct sockaddr *)lsa6);
4510                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "dst: ");
4511                         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT3, (struct sockaddr *)sin6);
4512                         if (net) {
4513                                 sin6 = (struct sockaddr_in6 *)&net->ro._l_addr;
4514                                 /*
4515                                  * preserve the port and scope for link
4516                                  * local send
4517                                  */
4518                                 prev_scope = sin6->sin6_scope_id;
4519                                 prev_port = sin6->sin6_port;
4520                         }
4521
4522                         if (SCTP_GET_HEADER_FOR_OUTPUT(o_pak)) {
4523                                 /* failed to prepend data, give up */
4524                                 sctp_m_freem(m);
4525                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
4526                                 return (ENOMEM);
4527                         }
4528                         SCTP_ATTACH_CHAIN(o_pak, m, packet_length);
4529                         if (port) {
4530                                 sctphdr->checksum = sctp_calculate_cksum(m, sizeof(struct ip6_hdr) + sizeof(struct udphdr));
4531                                 SCTP_STAT_INCR(sctps_sendswcrc);
4532                                 if ((udp->uh_sum = in6_cksum(o_pak, IPPROTO_UDP, sizeof(struct ip6_hdr), packet_length - sizeof(struct ip6_hdr))) == 0) {
4533                                         udp->uh_sum = 0xffff;
4534                                 }
4535                         } else {
4536                                 m->m_pkthdr.csum_flags = CSUM_SCTP_IPV6;
4537                                 m->m_pkthdr.csum_data = offsetof(struct sctphdr, checksum);
4538                                 SCTP_STAT_INCR(sctps_sendhwcrc);
4539                         }
4540                         /* send it out. table id is taken from stcb */
4541 #ifdef SCTP_PACKET_LOGGING
4542                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING)
4543                                 sctp_packet_log(o_pak);
4544 #endif
4545                         SCTP_PROBE5(send, NULL, stcb, ip6h, stcb, sctphdr);
4546                         SCTP_IP6_OUTPUT(ret, o_pak, (struct route_in6 *)ro, &ifp, inp, vrf_id);
4547                         if (net) {
4548                                 /* for link local this must be done */
4549                                 sin6->sin6_scope_id = prev_scope;
4550                                 sin6->sin6_port = prev_port;
4551                         }
4552                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "return from send is %d\n", ret);
4553                         if (port) {
4554                                 UDPSTAT_INC(udps_opackets);
4555                         }
4556                         SCTP_STAT_INCR(sctps_sendpackets);
4557                         SCTP_STAT_INCR_COUNTER64(sctps_outpackets);
4558                         if (ret) {
4559                                 SCTP_STAT_INCR(sctps_senderrors);
4560                         }
4561                         if (net == NULL) {
4562                                 /* Now if we had a temp route free it */
4563                                 RO_NHFREE(ro);
4564                         } else {
4565                                 /*
4566                                  * PMTU check versus smallest asoc MTU goes
4567                                  * here
4568                                  */
4569                                 if (ro->ro_nh == NULL) {
4570                                         /* Route was freed */
4571                                         if (net->ro._s_addr &&
4572                                             net->src_addr_selected) {
4573                                                 sctp_free_ifa(net->ro._s_addr);
4574                                                 net->ro._s_addr = NULL;
4575                                         }
4576                                         net->src_addr_selected = 0;
4577                                 }
4578                                 if ((ro->ro_nh != NULL) && (net->ro._s_addr) &&
4579                                     ((net->dest_state & SCTP_ADDR_NO_PMTUD) == 0)) {
4580                                         uint32_t mtu;
4581
4582                                         mtu = SCTP_GATHER_MTU_FROM_ROUTE(net->ro._s_addr, &net->ro._l_addr.sa, ro->ro_nh);
4583                                         if (mtu > 0) {
4584                                                 if (net->port) {
4585                                                         mtu -= sizeof(struct udphdr);
4586                                                 }
4587                                                 if (mtu < net->mtu) {
4588                                                         net->mtu = mtu;
4589                                                         if ((stcb != NULL) && (stcb->asoc.smallest_mtu > mtu)) {
4590                                                                 sctp_pathmtu_adjustment(stcb, mtu, false);
4591                                                         }
4592                                                 }
4593                                         }
4594                                 } else if (ifp != NULL) {
4595                                         if ((ND_IFINFO(ifp)->linkmtu > 0) &&
4596                                             (stcb->asoc.smallest_mtu > ND_IFINFO(ifp)->linkmtu)) {
4597                                                 sctp_pathmtu_adjustment(stcb, ND_IFINFO(ifp)->linkmtu, false);
4598                                         }
4599                                 }
4600                         }
4601                         return (ret);
4602                 }
4603 #endif
4604         default:
4605                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Unknown protocol (TSNH) type %d\n",
4606                     ((struct sockaddr *)to)->sa_family);
4607                 sctp_m_freem(m);
4608                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EFAULT);
4609                 return (EFAULT);
4610         }
4611 }
4612
4613 void
4614 sctp_send_initiate(struct sctp_inpcb *inp, struct sctp_tcb *stcb, int so_locked)
4615 {
4616         struct mbuf *m, *m_last;
4617         struct sctp_nets *net;
4618         struct sctp_init_chunk *init;
4619         struct sctp_supported_addr_param *sup_addr;
4620         struct sctp_adaptation_layer_indication *ali;
4621         struct sctp_supported_chunk_types_param *pr_supported;
4622         struct sctp_paramhdr *ph;
4623         int cnt_inits_to = 0;
4624         int error;
4625         uint16_t num_ext, chunk_len, padding_len, parameter_len;
4626
4627         /* INIT's always go to the primary (and usually ONLY address) */
4628         net = stcb->asoc.primary_destination;
4629         if (net == NULL) {
4630                 net = TAILQ_FIRST(&stcb->asoc.nets);
4631                 if (net == NULL) {
4632                         /* TSNH */
4633                         return;
4634                 }
4635                 /* we confirm any address we send an INIT to */
4636                 net->dest_state &= ~SCTP_ADDR_UNCONFIRMED;
4637                 (void)sctp_set_primary_addr(stcb, NULL, net);
4638         } else {
4639                 /* we confirm any address we send an INIT to */
4640                 net->dest_state &= ~SCTP_ADDR_UNCONFIRMED;
4641         }
4642         SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT\n");
4643 #ifdef INET6
4644         if (net->ro._l_addr.sa.sa_family == AF_INET6) {
4645                 /*
4646                  * special hook, if we are sending to link local it will not
4647                  * show up in our private address count.
4648                  */
4649                 if (IN6_IS_ADDR_LINKLOCAL(&net->ro._l_addr.sin6.sin6_addr))
4650                         cnt_inits_to = 1;
4651         }
4652 #endif
4653         if (SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
4654                 /* This case should not happen */
4655                 SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT - failed timer?\n");
4656                 return;
4657         }
4658         /* start the INIT timer */
4659         sctp_timer_start(SCTP_TIMER_TYPE_INIT, inp, stcb, net);
4660
4661         m = sctp_get_mbuf_for_msg(MCLBYTES, 1, M_NOWAIT, 1, MT_DATA);
4662         if (m == NULL) {
4663                 /* No memory, INIT timer will re-attempt. */
4664                 SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT - mbuf?\n");
4665                 return;
4666         }
4667         chunk_len = (uint16_t)sizeof(struct sctp_init_chunk);
4668         padding_len = 0;
4669         /* Now lets put the chunk header in place */
4670         init = mtod(m, struct sctp_init_chunk *);
4671         /* now the chunk header */
4672         init->ch.chunk_type = SCTP_INITIATION;
4673         init->ch.chunk_flags = 0;
4674         /* fill in later from mbuf we build */
4675         init->ch.chunk_length = 0;
4676         /* place in my tag */
4677         init->init.initiate_tag = htonl(stcb->asoc.my_vtag);
4678         /* set up some of the credits. */
4679         init->init.a_rwnd = htonl(max(inp->sctp_socket ? SCTP_SB_LIMIT_RCV(inp->sctp_socket) : 0,
4680             SCTP_MINIMAL_RWND));
4681         init->init.num_outbound_streams = htons(stcb->asoc.pre_open_streams);
4682         init->init.num_inbound_streams = htons(stcb->asoc.max_inbound_streams);
4683         init->init.initial_tsn = htonl(stcb->asoc.init_seq_number);
4684
4685         /* Adaptation layer indication parameter */
4686         if (inp->sctp_ep.adaptation_layer_indicator_provided) {
4687                 parameter_len = (uint16_t)sizeof(struct sctp_adaptation_layer_indication);
4688                 ali = (struct sctp_adaptation_layer_indication *)(mtod(m, caddr_t)+chunk_len);
4689                 ali->ph.param_type = htons(SCTP_ULP_ADAPTATION);
4690                 ali->ph.param_length = htons(parameter_len);
4691                 ali->indication = htonl(inp->sctp_ep.adaptation_layer_indicator);
4692                 chunk_len += parameter_len;
4693         }
4694
4695         /* ECN parameter */
4696         if (stcb->asoc.ecn_supported == 1) {
4697                 parameter_len = (uint16_t)sizeof(struct sctp_paramhdr);
4698                 ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
4699                 ph->param_type = htons(SCTP_ECN_CAPABLE);
4700                 ph->param_length = htons(parameter_len);
4701                 chunk_len += parameter_len;
4702         }
4703
4704         /* PR-SCTP supported parameter */
4705         if (stcb->asoc.prsctp_supported == 1) {
4706                 parameter_len = (uint16_t)sizeof(struct sctp_paramhdr);
4707                 ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
4708                 ph->param_type = htons(SCTP_PRSCTP_SUPPORTED);
4709                 ph->param_length = htons(parameter_len);
4710                 chunk_len += parameter_len;
4711         }
4712
4713         /* Add NAT friendly parameter. */
4714         if (SCTP_BASE_SYSCTL(sctp_inits_include_nat_friendly)) {
4715                 parameter_len = (uint16_t)sizeof(struct sctp_paramhdr);
4716                 ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
4717                 ph->param_type = htons(SCTP_HAS_NAT_SUPPORT);
4718                 ph->param_length = htons(parameter_len);
4719                 chunk_len += parameter_len;
4720         }
4721
4722         /* And now tell the peer which extensions we support */
4723         num_ext = 0;
4724         pr_supported = (struct sctp_supported_chunk_types_param *)(mtod(m, caddr_t)+chunk_len);
4725         if (stcb->asoc.prsctp_supported == 1) {
4726                 pr_supported->chunk_types[num_ext++] = SCTP_FORWARD_CUM_TSN;
4727                 if (stcb->asoc.idata_supported) {
4728                         pr_supported->chunk_types[num_ext++] = SCTP_IFORWARD_CUM_TSN;
4729                 }
4730         }
4731         if (stcb->asoc.auth_supported == 1) {
4732                 pr_supported->chunk_types[num_ext++] = SCTP_AUTHENTICATION;
4733         }
4734         if (stcb->asoc.asconf_supported == 1) {
4735                 pr_supported->chunk_types[num_ext++] = SCTP_ASCONF;
4736                 pr_supported->chunk_types[num_ext++] = SCTP_ASCONF_ACK;
4737         }
4738         if (stcb->asoc.reconfig_supported == 1) {
4739                 pr_supported->chunk_types[num_ext++] = SCTP_STREAM_RESET;
4740         }
4741         if (stcb->asoc.idata_supported) {
4742                 pr_supported->chunk_types[num_ext++] = SCTP_IDATA;
4743         }
4744         if (stcb->asoc.nrsack_supported == 1) {
4745                 pr_supported->chunk_types[num_ext++] = SCTP_NR_SELECTIVE_ACK;
4746         }
4747         if (stcb->asoc.pktdrop_supported == 1) {
4748                 pr_supported->chunk_types[num_ext++] = SCTP_PACKET_DROPPED;
4749         }
4750         if (num_ext > 0) {
4751                 parameter_len = (uint16_t)sizeof(struct sctp_supported_chunk_types_param) + num_ext;
4752                 pr_supported->ph.param_type = htons(SCTP_SUPPORTED_CHUNK_EXT);
4753                 pr_supported->ph.param_length = htons(parameter_len);
4754                 padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
4755                 chunk_len += parameter_len;
4756         }
4757         /* add authentication parameters */
4758         if (stcb->asoc.auth_supported) {
4759                 /* attach RANDOM parameter, if available */
4760                 if (stcb->asoc.authinfo.random != NULL) {
4761                         struct sctp_auth_random *randp;
4762
4763                         if (padding_len > 0) {
4764                                 memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
4765                                 chunk_len += padding_len;
4766                                 padding_len = 0;
4767                         }
4768                         randp = (struct sctp_auth_random *)(mtod(m, caddr_t)+chunk_len);
4769                         parameter_len = (uint16_t)sizeof(struct sctp_auth_random) + stcb->asoc.authinfo.random_len;
4770                         /* random key already contains the header */
4771                         memcpy(randp, stcb->asoc.authinfo.random->key, parameter_len);
4772                         padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
4773                         chunk_len += parameter_len;
4774                 }
4775                 /* add HMAC_ALGO parameter */
4776                 if (stcb->asoc.local_hmacs != NULL) {
4777                         struct sctp_auth_hmac_algo *hmacs;
4778
4779                         if (padding_len > 0) {
4780                                 memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
4781                                 chunk_len += padding_len;
4782                                 padding_len = 0;
4783                         }
4784                         hmacs = (struct sctp_auth_hmac_algo *)(mtod(m, caddr_t)+chunk_len);
4785                         parameter_len = (uint16_t)(sizeof(struct sctp_auth_hmac_algo) +
4786                             stcb->asoc.local_hmacs->num_algo * sizeof(uint16_t));
4787                         hmacs->ph.param_type = htons(SCTP_HMAC_LIST);
4788                         hmacs->ph.param_length = htons(parameter_len);
4789                         sctp_serialize_hmaclist(stcb->asoc.local_hmacs, (uint8_t *)hmacs->hmac_ids);
4790                         padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
4791                         chunk_len += parameter_len;
4792                 }
4793                 /* add CHUNKS parameter */
4794                 if (stcb->asoc.local_auth_chunks != NULL) {
4795                         struct sctp_auth_chunk_list *chunks;
4796
4797                         if (padding_len > 0) {
4798                                 memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
4799                                 chunk_len += padding_len;
4800                                 padding_len = 0;
4801                         }
4802                         chunks = (struct sctp_auth_chunk_list *)(mtod(m, caddr_t)+chunk_len);
4803                         parameter_len = (uint16_t)(sizeof(struct sctp_auth_chunk_list) +
4804                             sctp_auth_get_chklist_size(stcb->asoc.local_auth_chunks));
4805                         chunks->ph.param_type = htons(SCTP_CHUNK_LIST);
4806                         chunks->ph.param_length = htons(parameter_len);
4807                         sctp_serialize_auth_chunks(stcb->asoc.local_auth_chunks, chunks->chunk_types);
4808                         padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
4809                         chunk_len += parameter_len;
4810                 }
4811         }
4812
4813         /* now any cookie time extensions */
4814         if (stcb->asoc.cookie_preserve_req > 0) {
4815                 struct sctp_cookie_perserve_param *cookie_preserve;
4816
4817                 if (padding_len > 0) {
4818                         memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
4819                         chunk_len += padding_len;
4820                         padding_len = 0;
4821                 }
4822                 parameter_len = (uint16_t)sizeof(struct sctp_cookie_perserve_param);
4823                 cookie_preserve = (struct sctp_cookie_perserve_param *)(mtod(m, caddr_t)+chunk_len);
4824                 cookie_preserve->ph.param_type = htons(SCTP_COOKIE_PRESERVE);
4825                 cookie_preserve->ph.param_length = htons(parameter_len);
4826                 cookie_preserve->time = htonl(stcb->asoc.cookie_preserve_req);
4827                 stcb->asoc.cookie_preserve_req = 0;
4828                 chunk_len += parameter_len;
4829         }
4830
4831         if (stcb->asoc.scope.ipv4_addr_legal || stcb->asoc.scope.ipv6_addr_legal) {
4832                 uint8_t i;
4833
4834                 if (padding_len > 0) {
4835                         memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
4836                         chunk_len += padding_len;
4837                         padding_len = 0;
4838                 }
4839                 parameter_len = (uint16_t)sizeof(struct sctp_paramhdr);
4840                 if (stcb->asoc.scope.ipv4_addr_legal) {
4841                         parameter_len += (uint16_t)sizeof(uint16_t);
4842                 }
4843                 if (stcb->asoc.scope.ipv6_addr_legal) {
4844                         parameter_len += (uint16_t)sizeof(uint16_t);
4845                 }
4846                 sup_addr = (struct sctp_supported_addr_param *)(mtod(m, caddr_t)+chunk_len);
4847                 sup_addr->ph.param_type = htons(SCTP_SUPPORTED_ADDRTYPE);
4848                 sup_addr->ph.param_length = htons(parameter_len);
4849                 i = 0;
4850                 if (stcb->asoc.scope.ipv4_addr_legal) {
4851                         sup_addr->addr_type[i++] = htons(SCTP_IPV4_ADDRESS);
4852                 }
4853                 if (stcb->asoc.scope.ipv6_addr_legal) {
4854                         sup_addr->addr_type[i++] = htons(SCTP_IPV6_ADDRESS);
4855                 }
4856                 padding_len = 4 - 2 * i;
4857                 chunk_len += parameter_len;
4858         }
4859
4860         SCTP_BUF_LEN(m) = chunk_len;
4861         /* now the addresses */
4862         /*
4863          * To optimize this we could put the scoping stuff into a structure
4864          * and remove the individual uint8's from the assoc structure. Then
4865          * we could just sifa in the address within the stcb. But for now
4866          * this is a quick hack to get the address stuff teased apart.
4867          */
4868         m_last = sctp_add_addresses_to_i_ia(inp, stcb, &stcb->asoc.scope,
4869             m, cnt_inits_to,
4870             &padding_len, &chunk_len);
4871
4872         init->ch.chunk_length = htons(chunk_len);
4873         if (padding_len > 0) {
4874                 if (sctp_add_pad_tombuf(m_last, padding_len) == NULL) {
4875                         sctp_m_freem(m);
4876                         return;
4877                 }
4878         }
4879         SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT - calls lowlevel_output\n");
4880         if ((error = sctp_lowlevel_chunk_output(inp, stcb, net,
4881             (struct sockaddr *)&net->ro._l_addr,
4882             m, 0, NULL, 0, 0, 0, 0,
4883             inp->sctp_lport, stcb->rport, htonl(0),
4884             net->port, NULL,
4885             0, 0,
4886             so_locked))) {
4887                 SCTPDBG(SCTP_DEBUG_OUTPUT4, "Gak send error %d\n", error);
4888                 if (error == ENOBUFS) {
4889                         stcb->asoc.ifp_had_enobuf = 1;
4890                         SCTP_STAT_INCR(sctps_lowlevelerr);
4891                 }
4892         } else {
4893                 stcb->asoc.ifp_had_enobuf = 0;
4894         }
4895         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
4896         (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
4897 }
4898
4899 struct mbuf *
4900 sctp_arethere_unrecognized_parameters(struct mbuf *in_initpkt,
4901     int param_offset, int *abort_processing,
4902     struct sctp_chunkhdr *cp,
4903     int *nat_friendly,
4904     int *cookie_found)
4905 {
4906         /*
4907          * Given a mbuf containing an INIT or INIT-ACK with the param_offset
4908          * being equal to the beginning of the params i.e. (iphlen +
4909          * sizeof(struct sctp_init_msg) parse through the parameters to the
4910          * end of the mbuf verifying that all parameters are known.
4911          *
4912          * For unknown parameters build and return a mbuf with
4913          * UNRECOGNIZED_PARAMETER errors. If the flags indicate to stop
4914          * processing this chunk stop, and set *abort_processing to 1.
4915          *
4916          * By having param_offset be pre-set to where parameters begin it is
4917          * hoped that this routine may be reused in the future by new
4918          * features.
4919          */
4920         struct sctp_paramhdr *phdr, params;
4921
4922         struct mbuf *mat, *m_tmp, *op_err, *op_err_last;
4923         int at, limit, pad_needed;
4924         uint16_t ptype, plen, padded_size;
4925
4926         *abort_processing = 0;
4927         if (cookie_found != NULL) {
4928                 *cookie_found = 0;
4929         }
4930         mat = in_initpkt;
4931         limit = ntohs(cp->chunk_length) - sizeof(struct sctp_init_chunk);
4932         at = param_offset;
4933         op_err = NULL;
4934         op_err_last = NULL;
4935         pad_needed = 0;
4936         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Check for unrecognized param's\n");
4937         phdr = sctp_get_next_param(mat, at, &params, sizeof(params));
4938         while ((phdr != NULL) && ((size_t)limit >= sizeof(struct sctp_paramhdr))) {
4939                 ptype = ntohs(phdr->param_type);
4940                 plen = ntohs(phdr->param_length);
4941                 if ((plen > limit) || (plen < sizeof(struct sctp_paramhdr))) {
4942                         /* wacked parameter */
4943                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error %d\n", plen);
4944                         goto invalid_size;
4945                 }
4946                 limit -= SCTP_SIZE32(plen);
4947                 /*-
4948                  * All parameters for all chunks that we know/understand are
4949                  * listed here. We process them other places and make
4950                  * appropriate stop actions per the upper bits. However this
4951                  * is the generic routine processor's can call to get back
4952                  * an operr.. to either incorporate (init-ack) or send.
4953                  */
4954                 padded_size = SCTP_SIZE32(plen);
4955                 switch (ptype) {
4956                         /* Param's with variable size */
4957                 case SCTP_HEARTBEAT_INFO:
4958                 case SCTP_UNRECOG_PARAM:
4959                 case SCTP_ERROR_CAUSE_IND:
4960                         /* ok skip fwd */
4961                         at += padded_size;
4962                         break;
4963                 case SCTP_STATE_COOKIE:
4964                         if (cookie_found != NULL) {
4965                                 *cookie_found = 1;
4966                         }
4967                         at += padded_size;
4968                         break;
4969                         /* Param's with variable size within a range */
4970                 case SCTP_CHUNK_LIST:
4971                 case SCTP_SUPPORTED_CHUNK_EXT:
4972                         if (padded_size > (sizeof(struct sctp_supported_chunk_types_param) + (sizeof(uint8_t) * SCTP_MAX_SUPPORTED_EXT))) {
4973                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error chklist %d\n", plen);
4974                                 goto invalid_size;
4975                         }
4976                         at += padded_size;
4977                         break;
4978                 case SCTP_SUPPORTED_ADDRTYPE:
4979                         if (padded_size > SCTP_MAX_ADDR_PARAMS_SIZE) {
4980                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error supaddrtype %d\n", plen);
4981                                 goto invalid_size;
4982                         }
4983                         at += padded_size;
4984                         break;
4985                 case SCTP_RANDOM:
4986                         if (padded_size > (sizeof(struct sctp_auth_random) + SCTP_RANDOM_MAX_SIZE)) {
4987                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error random %d\n", plen);
4988                                 goto invalid_size;
4989                         }
4990                         at += padded_size;
4991                         break;
4992                 case SCTP_SET_PRIM_ADDR:
4993                 case SCTP_DEL_IP_ADDRESS:
4994                 case SCTP_ADD_IP_ADDRESS:
4995                         if ((padded_size != sizeof(struct sctp_asconf_addrv4_param)) &&
4996                             (padded_size != sizeof(struct sctp_asconf_addr_param))) {
4997                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error setprim %d\n", plen);
4998                                 goto invalid_size;
4999                         }
5000                         at += padded_size;
5001                         break;
5002                         /* Param's with a fixed size */
5003                 case SCTP_IPV4_ADDRESS:
5004                         if (padded_size != sizeof(struct sctp_ipv4addr_param)) {
5005                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error ipv4 addr %d\n", plen);
5006                                 goto invalid_size;
5007                         }
5008                         at += padded_size;
5009                         break;
5010                 case SCTP_IPV6_ADDRESS:
5011                         if (padded_size != sizeof(struct sctp_ipv6addr_param)) {
5012                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error ipv6 addr %d\n", plen);
5013                                 goto invalid_size;
5014                         }
5015                         at += padded_size;
5016                         break;
5017                 case SCTP_COOKIE_PRESERVE:
5018                         if (padded_size != sizeof(struct sctp_cookie_perserve_param)) {
5019                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error cookie-preserve %d\n", plen);
5020                                 goto invalid_size;
5021                         }
5022                         at += padded_size;
5023                         break;
5024                 case SCTP_HAS_NAT_SUPPORT:
5025                         *nat_friendly = 1;
5026                         /* fall through */
5027                 case SCTP_PRSCTP_SUPPORTED:
5028                         if (padded_size != sizeof(struct sctp_paramhdr)) {
5029                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error prsctp/nat support %d\n", plen);
5030                                 goto invalid_size;
5031                         }
5032                         at += padded_size;
5033                         break;
5034                 case SCTP_ECN_CAPABLE:
5035                         if (padded_size != sizeof(struct sctp_paramhdr)) {
5036                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error ecn %d\n", plen);
5037                                 goto invalid_size;
5038                         }
5039                         at += padded_size;
5040                         break;
5041                 case SCTP_ULP_ADAPTATION:
5042                         if (padded_size != sizeof(struct sctp_adaptation_layer_indication)) {
5043                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error adapatation %d\n", plen);
5044                                 goto invalid_size;
5045                         }
5046                         at += padded_size;
5047                         break;
5048                 case SCTP_SUCCESS_REPORT:
5049                         if (padded_size != sizeof(struct sctp_asconf_paramhdr)) {
5050                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error success %d\n", plen);
5051                                 goto invalid_size;
5052                         }
5053                         at += padded_size;
5054                         break;
5055                 case SCTP_HOSTNAME_ADDRESS:
5056                         {
5057                                 /* Hostname parameters are deprecated. */
5058                                 struct sctp_gen_error_cause *cause;
5059                                 int l_len;
5060
5061                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Can't handle hostname addresses.. abort processing\n");
5062                                 *abort_processing = 1;
5063                                 sctp_m_freem(op_err);
5064                                 op_err = NULL;
5065                                 op_err_last = NULL;
5066 #ifdef INET6
5067                                 l_len = SCTP_MIN_OVERHEAD;
5068 #else
5069                                 l_len = SCTP_MIN_V4_OVERHEAD;
5070 #endif
5071                                 l_len += sizeof(struct sctp_chunkhdr);
5072                                 l_len += sizeof(struct sctp_gen_error_cause);
5073                                 op_err = sctp_get_mbuf_for_msg(l_len, 0, M_NOWAIT, 1, MT_DATA);
5074                                 if (op_err != NULL) {
5075                                         /*
5076                                          * Pre-reserve space for IP, SCTP,
5077                                          * and chunk header.
5078                                          */
5079 #ifdef INET6
5080                                         SCTP_BUF_RESV_UF(op_err, sizeof(struct ip6_hdr));
5081 #else
5082                                         SCTP_BUF_RESV_UF(op_err, sizeof(struct ip));
5083 #endif
5084                                         SCTP_BUF_RESV_UF(op_err, sizeof(struct sctphdr));
5085                                         SCTP_BUF_RESV_UF(op_err, sizeof(struct sctp_chunkhdr));
5086                                         SCTP_BUF_LEN(op_err) = sizeof(struct sctp_gen_error_cause);
5087                                         cause = mtod(op_err, struct sctp_gen_error_cause *);
5088                                         cause->code = htons(SCTP_CAUSE_UNRESOLVABLE_ADDR);
5089                                         cause->length = htons((uint16_t)(sizeof(struct sctp_gen_error_cause) + plen));
5090                                         SCTP_BUF_NEXT(op_err) = SCTP_M_COPYM(mat, at, plen, M_NOWAIT);
5091                                         if (SCTP_BUF_NEXT(op_err) == NULL) {
5092                                                 sctp_m_freem(op_err);
5093                                                 op_err = NULL;
5094                                                 op_err_last = NULL;
5095                                         }
5096                                 }
5097                                 return (op_err);
5098                         }
5099                 default:
5100                         /*
5101                          * we do not recognize the parameter figure out what
5102                          * we do.
5103                          */
5104                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Hit default param %x\n", ptype);
5105                         if ((ptype & 0x4000) == 0x4000) {
5106                                 /* Report bit is set?? */
5107                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "report op err\n");
5108                                 if (op_err == NULL) {
5109                                         int l_len;
5110
5111                                         /* Ok need to try to get an mbuf */
5112 #ifdef INET6
5113                                         l_len = SCTP_MIN_OVERHEAD;
5114 #else
5115                                         l_len = SCTP_MIN_V4_OVERHEAD;
5116 #endif
5117                                         l_len += sizeof(struct sctp_chunkhdr);
5118                                         l_len += sizeof(struct sctp_paramhdr);
5119                                         op_err = sctp_get_mbuf_for_msg(l_len, 0, M_NOWAIT, 1, MT_DATA);
5120                                         if (op_err) {
5121                                                 SCTP_BUF_LEN(op_err) = 0;
5122 #ifdef INET6
5123                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip6_hdr));
5124 #else
5125                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip));
5126 #endif
5127                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctphdr));
5128                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctp_chunkhdr));
5129                                                 op_err_last = op_err;
5130                                         }
5131                                 }
5132                                 if (op_err != NULL) {
5133                                         /* If we have space */
5134                                         struct sctp_paramhdr *param;
5135
5136                                         if (pad_needed > 0) {
5137                                                 op_err_last = sctp_add_pad_tombuf(op_err_last, pad_needed);
5138                                         }
5139                                         if (op_err_last == NULL) {
5140                                                 sctp_m_freem(op_err);
5141                                                 op_err = NULL;
5142                                                 op_err_last = NULL;
5143                                                 goto more_processing;
5144                                         }
5145                                         if (M_TRAILINGSPACE(op_err_last) < (int)sizeof(struct sctp_paramhdr)) {
5146                                                 m_tmp = sctp_get_mbuf_for_msg(sizeof(struct sctp_paramhdr), 0, M_NOWAIT, 1, MT_DATA);
5147                                                 if (m_tmp == NULL) {
5148                                                         sctp_m_freem(op_err);
5149                                                         op_err = NULL;
5150                                                         op_err_last = NULL;
5151                                                         goto more_processing;
5152                                                 }
5153                                                 SCTP_BUF_LEN(m_tmp) = 0;
5154                                                 SCTP_BUF_NEXT(m_tmp) = NULL;
5155                                                 SCTP_BUF_NEXT(op_err_last) = m_tmp;
5156                                                 op_err_last = m_tmp;
5157                                         }
5158                                         param = (struct sctp_paramhdr *)(mtod(op_err_last, caddr_t)+SCTP_BUF_LEN(op_err_last));
5159                                         param->param_type = htons(SCTP_UNRECOG_PARAM);
5160                                         param->param_length = htons((uint16_t)sizeof(struct sctp_paramhdr) + plen);
5161                                         SCTP_BUF_LEN(op_err_last) += sizeof(struct sctp_paramhdr);
5162                                         SCTP_BUF_NEXT(op_err_last) = SCTP_M_COPYM(mat, at, plen, M_NOWAIT);
5163                                         if (SCTP_BUF_NEXT(op_err_last) == NULL) {
5164                                                 sctp_m_freem(op_err);
5165                                                 op_err = NULL;
5166                                                 op_err_last = NULL;
5167                                                 goto more_processing;
5168                                         } else {
5169                                                 while (SCTP_BUF_NEXT(op_err_last) != NULL) {
5170                                                         op_err_last = SCTP_BUF_NEXT(op_err_last);
5171                                                 }
5172                                         }
5173                                         if (plen % 4 != 0) {
5174                                                 pad_needed = 4 - (plen % 4);
5175                                         } else {
5176                                                 pad_needed = 0;
5177                                         }
5178                                 }
5179                         }
5180         more_processing:
5181                         if ((ptype & 0x8000) == 0x0000) {
5182                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "stop proc\n");
5183                                 return (op_err);
5184                         } else {
5185                                 /* skip this chunk and continue processing */
5186                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "move on\n");
5187                                 at += SCTP_SIZE32(plen);
5188                         }
5189                         break;
5190                 }
5191                 phdr = sctp_get_next_param(mat, at, &params, sizeof(params));
5192         }
5193         return (op_err);
5194 invalid_size:
5195         SCTPDBG(SCTP_DEBUG_OUTPUT1, "abort flag set\n");
5196         *abort_processing = 1;
5197         sctp_m_freem(op_err);
5198         op_err = NULL;
5199         op_err_last = NULL;
5200         if (phdr != NULL) {
5201                 struct sctp_paramhdr *param;
5202                 int l_len;
5203 #ifdef INET6
5204                 l_len = SCTP_MIN_OVERHEAD;
5205 #else
5206                 l_len = SCTP_MIN_V4_OVERHEAD;
5207 #endif
5208                 l_len += sizeof(struct sctp_chunkhdr);
5209                 l_len += (2 * sizeof(struct sctp_paramhdr));
5210                 op_err = sctp_get_mbuf_for_msg(l_len, 0, M_NOWAIT, 1, MT_DATA);
5211                 if (op_err) {
5212                         SCTP_BUF_LEN(op_err) = 0;
5213 #ifdef INET6
5214                         SCTP_BUF_RESV_UF(op_err, sizeof(struct ip6_hdr));
5215 #else
5216                         SCTP_BUF_RESV_UF(op_err, sizeof(struct ip));
5217 #endif
5218                         SCTP_BUF_RESV_UF(op_err, sizeof(struct sctphdr));
5219                         SCTP_BUF_RESV_UF(op_err, sizeof(struct sctp_chunkhdr));
5220                         SCTP_BUF_LEN(op_err) = 2 * sizeof(struct sctp_paramhdr);
5221                         param = mtod(op_err, struct sctp_paramhdr *);
5222                         param->param_type = htons(SCTP_CAUSE_PROTOCOL_VIOLATION);
5223                         param->param_length = htons(2 * sizeof(struct sctp_paramhdr));
5224                         param++;
5225                         param->param_type = htons(ptype);
5226                         param->param_length = htons(plen);
5227                 }
5228         }
5229         return (op_err);
5230 }
5231
5232 /*
5233  * Given a INIT chunk, look through the parameters to verify that there
5234  * are no new addresses.
5235  * Return true, if there is a new address or there is a problem parsing
5236    the parameters. Provide an optional error cause used when sending an ABORT.
5237  * Return false, if there are no new addresses and there is no problem in
5238    parameter processing.
5239  */
5240 static bool
5241 sctp_are_there_new_addresses(struct sctp_association *asoc,
5242     struct mbuf *in_initpkt, int offset, int limit, struct sockaddr *src,
5243     struct mbuf **op_err)
5244 {
5245         struct sockaddr *sa_touse;
5246         struct sockaddr *sa;
5247         struct sctp_paramhdr *phdr, params;
5248         struct sctp_nets *net;
5249 #ifdef INET
5250         struct sockaddr_in sin4, *sa4;
5251 #endif
5252 #ifdef INET6
5253         struct sockaddr_in6 sin6, *sa6;
5254 #endif
5255         uint16_t ptype, plen;
5256         bool fnd, check_src;
5257
5258         *op_err = NULL;
5259 #ifdef INET
5260         memset(&sin4, 0, sizeof(sin4));
5261         sin4.sin_family = AF_INET;
5262         sin4.sin_len = sizeof(sin4);
5263 #endif
5264 #ifdef INET6
5265         memset(&sin6, 0, sizeof(sin6));
5266         sin6.sin6_family = AF_INET6;
5267         sin6.sin6_len = sizeof(sin6);
5268 #endif
5269         /* First what about the src address of the pkt ? */
5270         check_src = false;
5271         switch (src->sa_family) {
5272 #ifdef INET
5273         case AF_INET:
5274                 if (asoc->scope.ipv4_addr_legal) {
5275                         check_src = true;
5276                 }
5277                 break;
5278 #endif
5279 #ifdef INET6
5280         case AF_INET6:
5281                 if (asoc->scope.ipv6_addr_legal) {
5282                         check_src = true;
5283                 }
5284                 break;
5285 #endif
5286         default:
5287                 /* TSNH */
5288                 break;
5289         }
5290         if (check_src) {
5291                 fnd = false;
5292                 TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
5293                         sa = (struct sockaddr *)&net->ro._l_addr;
5294                         if (sa->sa_family == src->sa_family) {
5295 #ifdef INET
5296                                 if (sa->sa_family == AF_INET) {
5297                                         struct sockaddr_in *src4;
5298
5299                                         sa4 = (struct sockaddr_in *)sa;
5300                                         src4 = (struct sockaddr_in *)src;
5301                                         if (sa4->sin_addr.s_addr == src4->sin_addr.s_addr) {
5302                                                 fnd = true;
5303                                                 break;
5304                                         }
5305                                 }
5306 #endif
5307 #ifdef INET6
5308                                 if (sa->sa_family == AF_INET6) {
5309                                         struct sockaddr_in6 *src6;
5310
5311                                         sa6 = (struct sockaddr_in6 *)sa;
5312                                         src6 = (struct sockaddr_in6 *)src;
5313                                         if (SCTP6_ARE_ADDR_EQUAL(sa6, src6)) {
5314                                                 fnd = true;
5315                                                 break;
5316                                         }
5317                                 }
5318 #endif
5319                         }
5320                 }
5321                 if (!fnd) {
5322                         /*
5323                          * If sending an ABORT in case of an additional
5324                          * address, don't use the new address error cause.
5325                          * This looks no different than if no listener was
5326                          * present.
5327                          */
5328                         *op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), "Address added");
5329                         return (true);
5330                 }
5331         }
5332         /* Ok so far lets munge through the rest of the packet */
5333         offset += sizeof(struct sctp_init_chunk);
5334         phdr = sctp_get_next_param(in_initpkt, offset, &params, sizeof(params));
5335         while (phdr) {
5336                 sa_touse = NULL;
5337                 ptype = ntohs(phdr->param_type);
5338                 plen = ntohs(phdr->param_length);
5339                 if (offset + plen > limit) {
5340                         *op_err = sctp_generate_cause(SCTP_CAUSE_PROTOCOL_VIOLATION, "Partial parameter");
5341                         return (true);
5342                 }
5343                 if (plen < sizeof(struct sctp_paramhdr)) {
5344                         *op_err = sctp_generate_cause(SCTP_CAUSE_PROTOCOL_VIOLATION, "Parameter length too small");
5345                         return (true);
5346                 }
5347                 switch (ptype) {
5348 #ifdef INET
5349                 case SCTP_IPV4_ADDRESS:
5350                         {
5351                                 struct sctp_ipv4addr_param *p4, p4_buf;
5352
5353                                 if (plen != sizeof(struct sctp_ipv4addr_param)) {
5354                                         *op_err = sctp_generate_cause(SCTP_CAUSE_PROTOCOL_VIOLATION, "Parameter length illegal");
5355                                         return (true);
5356                                 }
5357                                 phdr = sctp_get_next_param(in_initpkt, offset,
5358                                     (struct sctp_paramhdr *)&p4_buf, sizeof(p4_buf));
5359                                 if (phdr == NULL) {
5360                                         *op_err = sctp_generate_cause(SCTP_CAUSE_PROTOCOL_VIOLATION, "");
5361                                         return (true);
5362                                 }
5363                                 if (asoc->scope.ipv4_addr_legal) {
5364                                         p4 = (struct sctp_ipv4addr_param *)phdr;
5365                                         sin4.sin_addr.s_addr = p4->addr;
5366                                         sa_touse = (struct sockaddr *)&sin4;
5367                                 }
5368                                 break;
5369                         }
5370 #endif
5371 #ifdef INET6
5372                 case SCTP_IPV6_ADDRESS:
5373                         {
5374                                 struct sctp_ipv6addr_param *p6, p6_buf;
5375
5376                                 if (plen != sizeof(struct sctp_ipv6addr_param)) {
5377                                         *op_err = sctp_generate_cause(SCTP_CAUSE_PROTOCOL_VIOLATION, "Parameter length illegal");
5378                                         return (true);
5379                                 }
5380                                 phdr = sctp_get_next_param(in_initpkt, offset,
5381                                     (struct sctp_paramhdr *)&p6_buf, sizeof(p6_buf));
5382                                 if (phdr == NULL) {
5383                                         *op_err = sctp_generate_cause(SCTP_CAUSE_PROTOCOL_VIOLATION, "");
5384                                         return (true);
5385                                 }
5386                                 if (asoc->scope.ipv6_addr_legal) {
5387                                         p6 = (struct sctp_ipv6addr_param *)phdr;
5388                                         memcpy((caddr_t)&sin6.sin6_addr, p6->addr,
5389                                             sizeof(p6->addr));
5390                                         sa_touse = (struct sockaddr *)&sin6;
5391                                 }
5392                                 break;
5393                         }
5394 #endif
5395                 default:
5396                         sa_touse = NULL;
5397                         break;
5398                 }
5399                 if (sa_touse) {
5400                         /* ok, sa_touse points to one to check */
5401                         fnd = false;
5402                         TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
5403                                 sa = (struct sockaddr *)&net->ro._l_addr;
5404                                 if (sa->sa_family != sa_touse->sa_family) {
5405                                         continue;
5406                                 }
5407 #ifdef INET
5408                                 if (sa->sa_family == AF_INET) {
5409                                         sa4 = (struct sockaddr_in *)sa;
5410                                         if (sa4->sin_addr.s_addr ==
5411                                             sin4.sin_addr.s_addr) {
5412                                                 fnd = true;
5413                                                 break;
5414                                         }
5415                                 }
5416 #endif
5417 #ifdef INET6
5418                                 if (sa->sa_family == AF_INET6) {
5419                                         sa6 = (struct sockaddr_in6 *)sa;
5420                                         if (SCTP6_ARE_ADDR_EQUAL(
5421                                             sa6, &sin6)) {
5422                                                 fnd = true;
5423                                                 break;
5424                                         }
5425                                 }
5426 #endif
5427                         }
5428                         if (!fnd) {
5429                                 /*
5430                                  * If sending an ABORT in case of an
5431                                  * additional address, don't use the new
5432                                  * address error cause. This looks no
5433                                  * different than if no listener was
5434                                  * present.
5435                                  */
5436                                 *op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), "Address added");
5437                                 return (true);
5438                         }
5439                 }
5440                 offset += SCTP_SIZE32(plen);
5441                 if (offset >= limit) {
5442                         break;
5443                 }
5444                 phdr = sctp_get_next_param(in_initpkt, offset, &params, sizeof(params));
5445         }
5446         return (false);
5447 }
5448
5449 /*
5450  * Given a MBUF chain that was sent into us containing an INIT. Build a
5451  * INIT-ACK with COOKIE and send back. We assume that the in_initpkt has done
5452  * a pullup to include IPv6/4header, SCTP header and initial part of INIT
5453  * message (i.e. the struct sctp_init_msg).
5454  */
5455 void
5456 sctp_send_initiate_ack(struct sctp_inpcb *inp, struct sctp_tcb *stcb,
5457     struct sctp_nets *src_net, struct mbuf *init_pkt,
5458     int iphlen, int offset,
5459     struct sockaddr *src, struct sockaddr *dst,
5460     struct sctphdr *sh, struct sctp_init_chunk *init_chk,
5461     uint8_t mflowtype, uint32_t mflowid,
5462     uint32_t vrf_id, uint16_t port)
5463 {
5464         struct sctp_association *asoc;
5465         struct mbuf *m, *m_tmp, *m_last, *m_cookie, *op_err;
5466         struct sctp_init_ack_chunk *initack;
5467         struct sctp_adaptation_layer_indication *ali;
5468         struct sctp_supported_chunk_types_param *pr_supported;
5469         struct sctp_paramhdr *ph;
5470         union sctp_sockstore *over_addr;
5471         struct sctp_scoping scp;
5472         struct timeval now;
5473 #ifdef INET
5474         struct sockaddr_in *dst4 = (struct sockaddr_in *)dst;
5475         struct sockaddr_in *src4 = (struct sockaddr_in *)src;
5476         struct sockaddr_in *sin;
5477 #endif
5478 #ifdef INET6
5479         struct sockaddr_in6 *dst6 = (struct sockaddr_in6 *)dst;
5480         struct sockaddr_in6 *src6 = (struct sockaddr_in6 *)src;
5481         struct sockaddr_in6 *sin6;
5482 #endif
5483         struct sockaddr *to;
5484         struct sctp_state_cookie stc;
5485         struct sctp_nets *net = NULL;
5486         uint8_t *signature = NULL;
5487         int cnt_inits_to = 0;
5488         uint16_t his_limit, i_want;
5489         int abort_flag;
5490         int nat_friendly = 0;
5491         int error;
5492         struct socket *so;
5493         uint16_t num_ext, chunk_len, padding_len, parameter_len;
5494
5495         if (stcb) {
5496                 asoc = &stcb->asoc;
5497         } else {
5498                 asoc = NULL;
5499         }
5500         if ((asoc != NULL) &&
5501             (SCTP_GET_STATE(stcb) != SCTP_STATE_COOKIE_WAIT)) {
5502                 if (sctp_are_there_new_addresses(asoc, init_pkt, offset, offset + ntohs(init_chk->ch.chunk_length), src, &op_err)) {
5503                         /*
5504                          * new addresses, out of here in non-cookie-wait
5505                          * states
5506                          */
5507                         sctp_send_abort(init_pkt, iphlen, src, dst, sh, 0, op_err,
5508                             mflowtype, mflowid, inp->fibnum,
5509                             vrf_id, port);
5510                         return;
5511                 }
5512                 if (src_net != NULL && (src_net->port != port)) {
5513                         /*
5514                          * change of remote encapsulation port, out of here
5515                          * in non-cookie-wait states
5516                          *
5517                          * Send an ABORT, without an specific error cause.
5518                          * This looks no different than if no listener was
5519                          * present.
5520                          */
5521                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
5522                             "Remote encapsulation port changed");
5523                         sctp_send_abort(init_pkt, iphlen, src, dst, sh, 0, op_err,
5524                             mflowtype, mflowid, inp->fibnum,
5525                             vrf_id, port);
5526                         return;
5527                 }
5528         }
5529         abort_flag = 0;
5530         op_err = sctp_arethere_unrecognized_parameters(init_pkt,
5531             (offset + sizeof(struct sctp_init_chunk)),
5532             &abort_flag,
5533             (struct sctp_chunkhdr *)init_chk,
5534             &nat_friendly, NULL);
5535         if (abort_flag) {
5536 do_a_abort:
5537                 if (op_err == NULL) {
5538                         char msg[SCTP_DIAG_INFO_LEN];
5539
5540                         SCTP_SNPRINTF(msg, sizeof(msg), "%s:%d at %s", __FILE__, __LINE__, __func__);
5541                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
5542                             msg);
5543                 }
5544                 sctp_send_abort(init_pkt, iphlen, src, dst, sh,
5545                     init_chk->init.initiate_tag, op_err,
5546                     mflowtype, mflowid, inp->fibnum,
5547                     vrf_id, port);
5548                 return;
5549         }
5550         m = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
5551         if (m == NULL) {
5552                 /* No memory, INIT timer will re-attempt. */
5553                 sctp_m_freem(op_err);
5554                 return;
5555         }
5556         chunk_len = (uint16_t)sizeof(struct sctp_init_ack_chunk);
5557         padding_len = 0;
5558
5559         /*
5560          * We might not overwrite the identification[] completely and on
5561          * some platforms time_entered will contain some padding. Therefore
5562          * zero out the cookie to avoid putting uninitialized memory on the
5563          * wire.
5564          */
5565         memset(&stc, 0, sizeof(struct sctp_state_cookie));
5566
5567         /* the time I built cookie */
5568         (void)SCTP_GETTIME_TIMEVAL(&now);
5569         stc.time_entered.tv_sec = now.tv_sec;
5570         stc.time_entered.tv_usec = now.tv_usec;
5571
5572         /* populate any tie tags */
5573         if (asoc != NULL) {
5574                 /* unlock before tag selections */
5575                 stc.tie_tag_my_vtag = asoc->my_vtag_nonce;
5576                 stc.tie_tag_peer_vtag = asoc->peer_vtag_nonce;
5577                 stc.cookie_life = asoc->cookie_life;
5578                 net = asoc->primary_destination;
5579         } else {
5580                 stc.tie_tag_my_vtag = 0;
5581                 stc.tie_tag_peer_vtag = 0;
5582                 /* life I will award this cookie */
5583                 stc.cookie_life = inp->sctp_ep.def_cookie_life;
5584         }
5585
5586         /* copy in the ports for later check */
5587         stc.myport = sh->dest_port;
5588         stc.peerport = sh->src_port;
5589
5590         /*
5591          * If we wanted to honor cookie life extensions, we would add to
5592          * stc.cookie_life. For now we should NOT honor any extension
5593          */
5594         stc.site_scope = stc.local_scope = stc.loopback_scope = 0;
5595         if (inp->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
5596                 stc.ipv6_addr_legal = 1;
5597                 if (SCTP_IPV6_V6ONLY(inp)) {
5598                         stc.ipv4_addr_legal = 0;
5599                 } else {
5600                         stc.ipv4_addr_legal = 1;
5601                 }
5602         } else {
5603                 stc.ipv6_addr_legal = 0;
5604                 stc.ipv4_addr_legal = 1;
5605         }
5606         stc.ipv4_scope = 0;
5607         if (net == NULL) {
5608                 to = src;
5609                 switch (dst->sa_family) {
5610 #ifdef INET
5611                 case AF_INET:
5612                         {
5613                                 /* lookup address */
5614                                 stc.address[0] = src4->sin_addr.s_addr;
5615                                 stc.address[1] = 0;
5616                                 stc.address[2] = 0;
5617                                 stc.address[3] = 0;
5618                                 stc.addr_type = SCTP_IPV4_ADDRESS;
5619                                 /* local from address */
5620                                 stc.laddress[0] = dst4->sin_addr.s_addr;
5621                                 stc.laddress[1] = 0;
5622                                 stc.laddress[2] = 0;
5623                                 stc.laddress[3] = 0;
5624                                 stc.laddr_type = SCTP_IPV4_ADDRESS;
5625                                 /* scope_id is only for v6 */
5626                                 stc.scope_id = 0;
5627                                 if ((IN4_ISPRIVATE_ADDRESS(&src4->sin_addr)) ||
5628                                     (IN4_ISPRIVATE_ADDRESS(&dst4->sin_addr))) {
5629                                         stc.ipv4_scope = 1;
5630                                 }
5631                                 /* Must use the address in this case */
5632                                 if (sctp_is_address_on_local_host(src, vrf_id)) {
5633                                         stc.loopback_scope = 1;
5634                                         stc.ipv4_scope = 1;
5635                                         stc.site_scope = 1;
5636                                         stc.local_scope = 0;
5637                                 }
5638                                 break;
5639                         }
5640 #endif
5641 #ifdef INET6
5642                 case AF_INET6:
5643                         {
5644                                 stc.addr_type = SCTP_IPV6_ADDRESS;
5645                                 memcpy(&stc.address, &src6->sin6_addr, sizeof(struct in6_addr));
5646                                 stc.scope_id = ntohs(in6_getscope(&src6->sin6_addr));
5647                                 if (sctp_is_address_on_local_host(src, vrf_id)) {
5648                                         stc.loopback_scope = 1;
5649                                         stc.local_scope = 0;
5650                                         stc.site_scope = 1;
5651                                         stc.ipv4_scope = 1;
5652                                 } else if (IN6_IS_ADDR_LINKLOCAL(&src6->sin6_addr) ||
5653                                     IN6_IS_ADDR_LINKLOCAL(&dst6->sin6_addr)) {
5654                                         /*
5655                                          * If the new destination or source
5656                                          * is a LINK_LOCAL we must have
5657                                          * common both site and local scope.
5658                                          * Don't set local scope though
5659                                          * since we must depend on the
5660                                          * source to be added implicitly. We
5661                                          * cannot assure just because we
5662                                          * share one link that all links are
5663                                          * common.
5664                                          */
5665                                         stc.local_scope = 0;
5666                                         stc.site_scope = 1;
5667                                         stc.ipv4_scope = 1;
5668                                         /*
5669                                          * we start counting for the private
5670                                          * address stuff at 1. since the
5671                                          * link local we source from won't
5672                                          * show up in our scoped count.
5673                                          */
5674                                         cnt_inits_to = 1;
5675                                         /*
5676                                          * pull out the scope_id from
5677                                          * incoming pkt
5678                                          */
5679                                 } else if (IN6_IS_ADDR_SITELOCAL(&src6->sin6_addr) ||
5680                                     IN6_IS_ADDR_SITELOCAL(&dst6->sin6_addr)) {
5681                                         /*
5682                                          * If the new destination or source
5683                                          * is SITE_LOCAL then we must have
5684                                          * site scope in common.
5685                                          */
5686                                         stc.site_scope = 1;
5687                                 }
5688                                 memcpy(&stc.laddress, &dst6->sin6_addr, sizeof(struct in6_addr));
5689                                 stc.laddr_type = SCTP_IPV6_ADDRESS;
5690                                 break;
5691                         }
5692 #endif
5693                 default:
5694                         /* TSNH */
5695                         goto do_a_abort;
5696                         break;
5697                 }
5698         } else {
5699                 /* set the scope per the existing tcb */
5700
5701 #ifdef INET6
5702                 struct sctp_nets *lnet;
5703 #endif
5704
5705                 stc.loopback_scope = asoc->scope.loopback_scope;
5706                 stc.ipv4_scope = asoc->scope.ipv4_local_scope;
5707                 stc.site_scope = asoc->scope.site_scope;
5708                 stc.local_scope = asoc->scope.local_scope;
5709 #ifdef INET6
5710                 /* Why do we not consider IPv4 LL addresses? */
5711                 TAILQ_FOREACH(lnet, &asoc->nets, sctp_next) {
5712                         if (lnet->ro._l_addr.sin6.sin6_family == AF_INET6) {
5713                                 if (IN6_IS_ADDR_LINKLOCAL(&lnet->ro._l_addr.sin6.sin6_addr)) {
5714                                         /*
5715                                          * if we have a LL address, start
5716                                          * counting at 1.
5717                                          */
5718                                         cnt_inits_to = 1;
5719                                 }
5720                         }
5721                 }
5722 #endif
5723                 /* use the net pointer */
5724                 to = (struct sockaddr *)&net->ro._l_addr;
5725                 switch (to->sa_family) {
5726 #ifdef INET
5727                 case AF_INET:
5728                         sin = (struct sockaddr_in *)to;
5729                         stc.address[0] = sin->sin_addr.s_addr;
5730                         stc.address[1] = 0;
5731                         stc.address[2] = 0;
5732                         stc.address[3] = 0;
5733                         stc.addr_type = SCTP_IPV4_ADDRESS;
5734                         if (net->src_addr_selected == 0) {
5735                                 /*
5736                                  * strange case here, the INIT should have
5737                                  * did the selection.
5738                                  */
5739                                 net->ro._s_addr = sctp_source_address_selection(inp,
5740                                     stcb, (sctp_route_t *)&net->ro,
5741                                     net, 0, vrf_id);
5742                                 if (net->ro._s_addr == NULL) {
5743                                         sctp_m_freem(op_err);
5744                                         sctp_m_freem(m);
5745                                         return;
5746                                 }
5747
5748                                 net->src_addr_selected = 1;
5749                         }
5750                         stc.laddress[0] = net->ro._s_addr->address.sin.sin_addr.s_addr;
5751                         stc.laddress[1] = 0;
5752                         stc.laddress[2] = 0;
5753                         stc.laddress[3] = 0;
5754                         stc.laddr_type = SCTP_IPV4_ADDRESS;
5755                         /* scope_id is only for v6 */
5756                         stc.scope_id = 0;
5757                         break;
5758 #endif
5759 #ifdef INET6
5760                 case AF_INET6:
5761                         sin6 = (struct sockaddr_in6 *)to;
5762                         memcpy(&stc.address, &sin6->sin6_addr,
5763                             sizeof(struct in6_addr));
5764                         stc.addr_type = SCTP_IPV6_ADDRESS;
5765                         stc.scope_id = sin6->sin6_scope_id;
5766                         if (net->src_addr_selected == 0) {
5767                                 /*
5768                                  * strange case here, the INIT should have
5769                                  * done the selection.
5770                                  */
5771                                 net->ro._s_addr = sctp_source_address_selection(inp,
5772                                     stcb, (sctp_route_t *)&net->ro,
5773                                     net, 0, vrf_id);
5774                                 if (net->ro._s_addr == NULL) {
5775                                         sctp_m_freem(op_err);
5776                                         sctp_m_freem(m);
5777                                         return;
5778                                 }
5779
5780                                 net->src_addr_selected = 1;
5781                         }
5782                         memcpy(&stc.laddress, &net->ro._s_addr->address.sin6.sin6_addr,
5783                             sizeof(struct in6_addr));
5784                         stc.laddr_type = SCTP_IPV6_ADDRESS;
5785                         break;
5786 #endif
5787                 }
5788         }
5789         /* Now lets put the SCTP header in place */
5790         initack = mtod(m, struct sctp_init_ack_chunk *);
5791         /* Save it off for quick ref */
5792         stc.peers_vtag = ntohl(init_chk->init.initiate_tag);
5793         /* who are we */
5794         memcpy(stc.identification, SCTP_VERSION_STRING,
5795             min(strlen(SCTP_VERSION_STRING), sizeof(stc.identification)));
5796         memset(stc.reserved, 0, SCTP_RESERVE_SPACE);
5797         /* now the chunk header */
5798         initack->ch.chunk_type = SCTP_INITIATION_ACK;
5799         initack->ch.chunk_flags = 0;
5800         /* fill in later from mbuf we build */
5801         initack->ch.chunk_length = 0;
5802         /* place in my tag */
5803         if ((asoc != NULL) &&
5804             ((SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_WAIT) ||
5805             (SCTP_GET_STATE(stcb) == SCTP_STATE_INUSE) ||
5806             (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED))) {
5807                 /* re-use the v-tags and init-seq here */
5808                 initack->init.initiate_tag = htonl(asoc->my_vtag);
5809                 initack->init.initial_tsn = htonl(asoc->init_seq_number);
5810         } else {
5811                 uint32_t vtag, itsn;
5812
5813                 if (asoc) {
5814                         atomic_add_int(&asoc->refcnt, 1);
5815                         SCTP_TCB_UNLOCK(stcb);
5816         new_tag:
5817                         SCTP_INP_INFO_RLOCK();
5818                         vtag = sctp_select_a_tag(inp, inp->sctp_lport, sh->src_port, 1);
5819                         SCTP_INP_INFO_RUNLOCK();
5820                         if ((asoc->peer_supports_nat) && (vtag == asoc->my_vtag)) {
5821                                 /*
5822                                  * Got a duplicate vtag on some guy behind a
5823                                  * nat make sure we don't use it.
5824                                  */
5825                                 goto new_tag;
5826                         }
5827                         initack->init.initiate_tag = htonl(vtag);
5828                         /* get a TSN to use too */
5829                         itsn = sctp_select_initial_TSN(&inp->sctp_ep);
5830                         initack->init.initial_tsn = htonl(itsn);
5831                         SCTP_TCB_LOCK(stcb);
5832                         atomic_subtract_int(&asoc->refcnt, 1);
5833                 } else {
5834                         SCTP_INP_INCR_REF(inp);
5835                         SCTP_INP_RUNLOCK(inp);
5836                         SCTP_INP_INFO_RLOCK();
5837                         vtag = sctp_select_a_tag(inp, inp->sctp_lport, sh->src_port, 1);
5838                         SCTP_INP_INFO_RUNLOCK();
5839                         initack->init.initiate_tag = htonl(vtag);
5840                         /* get a TSN to use too */
5841                         initack->init.initial_tsn = htonl(sctp_select_initial_TSN(&inp->sctp_ep));
5842                         SCTP_INP_RLOCK(inp);
5843                         SCTP_INP_DECR_REF(inp);
5844                 }
5845         }
5846         /* save away my tag to */
5847         stc.my_vtag = initack->init.initiate_tag;
5848
5849         /* set up some of the credits. */
5850         so = inp->sctp_socket;
5851         if (so == NULL) {
5852                 /* memory problem */
5853                 sctp_m_freem(op_err);
5854                 sctp_m_freem(m);
5855                 return;
5856         } else {
5857                 initack->init.a_rwnd = htonl(max(SCTP_SB_LIMIT_RCV(so), SCTP_MINIMAL_RWND));
5858         }
5859         /* set what I want */
5860         his_limit = ntohs(init_chk->init.num_inbound_streams);
5861         /* choose what I want */
5862         if (asoc != NULL) {
5863                 if (asoc->streamoutcnt > asoc->pre_open_streams) {
5864                         i_want = asoc->streamoutcnt;
5865                 } else {
5866                         i_want = asoc->pre_open_streams;
5867                 }
5868         } else {
5869                 i_want = inp->sctp_ep.pre_open_stream_count;
5870         }
5871         if (his_limit < i_want) {
5872                 /* I Want more :< */
5873                 initack->init.num_outbound_streams = init_chk->init.num_inbound_streams;
5874         } else {
5875                 /* I can have what I want :> */
5876                 initack->init.num_outbound_streams = htons(i_want);
5877         }
5878         /* tell him his limit. */
5879         initack->init.num_inbound_streams =
5880             htons(inp->sctp_ep.max_open_streams_intome);
5881
5882         /* adaptation layer indication parameter */
5883         if (inp->sctp_ep.adaptation_layer_indicator_provided) {
5884                 parameter_len = (uint16_t)sizeof(struct sctp_adaptation_layer_indication);
5885                 ali = (struct sctp_adaptation_layer_indication *)(mtod(m, caddr_t)+chunk_len);
5886                 ali->ph.param_type = htons(SCTP_ULP_ADAPTATION);
5887                 ali->ph.param_length = htons(parameter_len);
5888                 ali->indication = htonl(inp->sctp_ep.adaptation_layer_indicator);
5889                 chunk_len += parameter_len;
5890         }
5891
5892         /* ECN parameter */
5893         if (((asoc != NULL) && (asoc->ecn_supported == 1)) ||
5894             ((asoc == NULL) && (inp->ecn_supported == 1))) {
5895                 parameter_len = (uint16_t)sizeof(struct sctp_paramhdr);
5896                 ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
5897                 ph->param_type = htons(SCTP_ECN_CAPABLE);
5898                 ph->param_length = htons(parameter_len);
5899                 chunk_len += parameter_len;
5900         }
5901
5902         /* PR-SCTP supported parameter */
5903         if (((asoc != NULL) && (asoc->prsctp_supported == 1)) ||
5904             ((asoc == NULL) && (inp->prsctp_supported == 1))) {
5905                 parameter_len = (uint16_t)sizeof(struct sctp_paramhdr);
5906                 ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
5907                 ph->param_type = htons(SCTP_PRSCTP_SUPPORTED);
5908                 ph->param_length = htons(parameter_len);
5909                 chunk_len += parameter_len;
5910         }
5911
5912         /* Add NAT friendly parameter */
5913         if (nat_friendly) {
5914                 parameter_len = (uint16_t)sizeof(struct sctp_paramhdr);
5915                 ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
5916                 ph->param_type = htons(SCTP_HAS_NAT_SUPPORT);
5917                 ph->param_length = htons(parameter_len);
5918                 chunk_len += parameter_len;
5919         }
5920
5921         /* And now tell the peer which extensions we support */
5922         num_ext = 0;
5923         pr_supported = (struct sctp_supported_chunk_types_param *)(mtod(m, caddr_t)+chunk_len);
5924         if (((asoc != NULL) && (asoc->prsctp_supported == 1)) ||
5925             ((asoc == NULL) && (inp->prsctp_supported == 1))) {
5926                 pr_supported->chunk_types[num_ext++] = SCTP_FORWARD_CUM_TSN;
5927                 if (((asoc != NULL) && (asoc->idata_supported == 1)) ||
5928                     ((asoc == NULL) && (inp->idata_supported == 1))) {
5929                         pr_supported->chunk_types[num_ext++] = SCTP_IFORWARD_CUM_TSN;
5930                 }
5931         }
5932         if (((asoc != NULL) && (asoc->auth_supported == 1)) ||
5933             ((asoc == NULL) && (inp->auth_supported == 1))) {
5934                 pr_supported->chunk_types[num_ext++] = SCTP_AUTHENTICATION;
5935         }
5936         if (((asoc != NULL) && (asoc->asconf_supported == 1)) ||
5937             ((asoc == NULL) && (inp->asconf_supported == 1))) {
5938                 pr_supported->chunk_types[num_ext++] = SCTP_ASCONF;
5939                 pr_supported->chunk_types[num_ext++] = SCTP_ASCONF_ACK;
5940         }
5941         if (((asoc != NULL) && (asoc->reconfig_supported == 1)) ||
5942             ((asoc == NULL) && (inp->reconfig_supported == 1))) {
5943                 pr_supported->chunk_types[num_ext++] = SCTP_STREAM_RESET;
5944         }
5945         if (((asoc != NULL) && (asoc->idata_supported == 1)) ||
5946             ((asoc == NULL) && (inp->idata_supported == 1))) {
5947                 pr_supported->chunk_types[num_ext++] = SCTP_IDATA;
5948         }
5949         if (((asoc != NULL) && (asoc->nrsack_supported == 1)) ||
5950             ((asoc == NULL) && (inp->nrsack_supported == 1))) {
5951                 pr_supported->chunk_types[num_ext++] = SCTP_NR_SELECTIVE_ACK;
5952         }
5953         if (((asoc != NULL) && (asoc->pktdrop_supported == 1)) ||
5954             ((asoc == NULL) && (inp->pktdrop_supported == 1))) {
5955                 pr_supported->chunk_types[num_ext++] = SCTP_PACKET_DROPPED;
5956         }
5957         if (num_ext > 0) {
5958                 parameter_len = (uint16_t)sizeof(struct sctp_supported_chunk_types_param) + num_ext;
5959                 pr_supported->ph.param_type = htons(SCTP_SUPPORTED_CHUNK_EXT);
5960                 pr_supported->ph.param_length = htons(parameter_len);
5961                 padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
5962                 chunk_len += parameter_len;
5963         }
5964
5965         /* add authentication parameters */
5966         if (((asoc != NULL) && (asoc->auth_supported == 1)) ||
5967             ((asoc == NULL) && (inp->auth_supported == 1))) {
5968                 struct sctp_auth_random *randp;
5969                 struct sctp_auth_hmac_algo *hmacs;
5970                 struct sctp_auth_chunk_list *chunks;
5971
5972                 if (padding_len > 0) {
5973                         memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
5974                         chunk_len += padding_len;
5975                         padding_len = 0;
5976                 }
5977                 /* generate and add RANDOM parameter */
5978                 randp = (struct sctp_auth_random *)(mtod(m, caddr_t)+chunk_len);
5979                 parameter_len = (uint16_t)sizeof(struct sctp_auth_random) +
5980                     SCTP_AUTH_RANDOM_SIZE_DEFAULT;
5981                 randp->ph.param_type = htons(SCTP_RANDOM);
5982                 randp->ph.param_length = htons(parameter_len);
5983                 SCTP_READ_RANDOM(randp->random_data, SCTP_AUTH_RANDOM_SIZE_DEFAULT);
5984                 padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
5985                 chunk_len += parameter_len;
5986
5987                 if (padding_len > 0) {
5988                         memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
5989                         chunk_len += padding_len;
5990                         padding_len = 0;
5991                 }
5992                 /* add HMAC_ALGO parameter */
5993                 hmacs = (struct sctp_auth_hmac_algo *)(mtod(m, caddr_t)+chunk_len);
5994                 parameter_len = (uint16_t)sizeof(struct sctp_auth_hmac_algo) +
5995                     sctp_serialize_hmaclist(inp->sctp_ep.local_hmacs,
5996                     (uint8_t *)hmacs->hmac_ids);
5997                 hmacs->ph.param_type = htons(SCTP_HMAC_LIST);
5998                 hmacs->ph.param_length = htons(parameter_len);
5999                 padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
6000                 chunk_len += parameter_len;
6001
6002                 if (padding_len > 0) {
6003                         memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
6004                         chunk_len += padding_len;
6005                         padding_len = 0;
6006                 }
6007                 /* add CHUNKS parameter */
6008                 chunks = (struct sctp_auth_chunk_list *)(mtod(m, caddr_t)+chunk_len);
6009                 parameter_len = (uint16_t)sizeof(struct sctp_auth_chunk_list) +
6010                     sctp_serialize_auth_chunks(inp->sctp_ep.local_auth_chunks,
6011                     chunks->chunk_types);
6012                 chunks->ph.param_type = htons(SCTP_CHUNK_LIST);
6013                 chunks->ph.param_length = htons(parameter_len);
6014                 padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
6015                 chunk_len += parameter_len;
6016         }
6017         SCTP_BUF_LEN(m) = chunk_len;
6018         m_last = m;
6019         /* now the addresses */
6020         /*
6021          * To optimize this we could put the scoping stuff into a structure
6022          * and remove the individual uint8's from the stc structure. Then we
6023          * could just sifa in the address within the stc.. but for now this
6024          * is a quick hack to get the address stuff teased apart.
6025          */
6026         scp.ipv4_addr_legal = stc.ipv4_addr_legal;
6027         scp.ipv6_addr_legal = stc.ipv6_addr_legal;
6028         scp.loopback_scope = stc.loopback_scope;
6029         scp.ipv4_local_scope = stc.ipv4_scope;
6030         scp.local_scope = stc.local_scope;
6031         scp.site_scope = stc.site_scope;
6032         m_last = sctp_add_addresses_to_i_ia(inp, stcb, &scp, m_last,
6033             cnt_inits_to,
6034             &padding_len, &chunk_len);
6035         /* padding_len can only be positive, if no addresses have been added */
6036         if (padding_len > 0) {
6037                 memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
6038                 chunk_len += padding_len;
6039                 SCTP_BUF_LEN(m) += padding_len;
6040                 padding_len = 0;
6041         }
6042
6043         /* tack on the operational error if present */
6044         if (op_err) {
6045                 parameter_len = 0;
6046                 for (m_tmp = op_err; m_tmp != NULL; m_tmp = SCTP_BUF_NEXT(m_tmp)) {
6047                         parameter_len += SCTP_BUF_LEN(m_tmp);
6048                 }
6049                 padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
6050                 SCTP_BUF_NEXT(m_last) = op_err;
6051                 while (SCTP_BUF_NEXT(m_last) != NULL) {
6052                         m_last = SCTP_BUF_NEXT(m_last);
6053                 }
6054                 chunk_len += parameter_len;
6055         }
6056         if (padding_len > 0) {
6057                 m_last = sctp_add_pad_tombuf(m_last, padding_len);
6058                 if (m_last == NULL) {
6059                         /* Houston we have a problem, no space */
6060                         sctp_m_freem(m);
6061                         return;
6062                 }
6063                 chunk_len += padding_len;
6064                 padding_len = 0;
6065         }
6066         /* Now we must build a cookie */
6067         m_cookie = sctp_add_cookie(init_pkt, offset, m, 0, &stc, &signature);
6068         if (m_cookie == NULL) {
6069                 /* memory problem */
6070                 sctp_m_freem(m);
6071                 return;
6072         }
6073         /* Now append the cookie to the end and update the space/size */
6074         SCTP_BUF_NEXT(m_last) = m_cookie;
6075         parameter_len = 0;
6076         for (m_tmp = m_cookie; m_tmp != NULL; m_tmp = SCTP_BUF_NEXT(m_tmp)) {
6077                 parameter_len += SCTP_BUF_LEN(m_tmp);
6078                 if (SCTP_BUF_NEXT(m_tmp) == NULL) {
6079                         m_last = m_tmp;
6080                 }
6081         }
6082         padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
6083         chunk_len += parameter_len;
6084
6085         /*
6086          * Place in the size, but we don't include the last pad (if any) in
6087          * the INIT-ACK.
6088          */
6089         initack->ch.chunk_length = htons(chunk_len);
6090
6091         /*
6092          * Time to sign the cookie, we don't sign over the cookie signature
6093          * though thus we set trailer.
6094          */
6095         (void)sctp_hmac_m(SCTP_HMAC,
6096             (uint8_t *)inp->sctp_ep.secret_key[(int)(inp->sctp_ep.current_secret_number)],
6097             SCTP_SECRET_SIZE, m_cookie, sizeof(struct sctp_paramhdr),
6098             (uint8_t *)signature, SCTP_SIGNATURE_SIZE);
6099         /*
6100          * We sifa 0 here to NOT set IP_DF if its IPv4, we ignore the return
6101          * here since the timer will drive a retranmission.
6102          */
6103         if (padding_len > 0) {
6104                 if (sctp_add_pad_tombuf(m_last, padding_len) == NULL) {
6105                         sctp_m_freem(m);
6106                         return;
6107                 }
6108         }
6109         if (stc.loopback_scope) {
6110                 over_addr = (union sctp_sockstore *)dst;
6111         } else {
6112                 over_addr = NULL;
6113         }
6114
6115         if ((error = sctp_lowlevel_chunk_output(inp, NULL, NULL, to, m, 0, NULL, 0, 0,
6116             0, 0,
6117             inp->sctp_lport, sh->src_port, init_chk->init.initiate_tag,
6118             port, over_addr,
6119             mflowtype, mflowid,
6120             SCTP_SO_NOT_LOCKED))) {
6121                 SCTPDBG(SCTP_DEBUG_OUTPUT4, "Gak send error %d\n", error);
6122                 if (error == ENOBUFS) {
6123                         if (asoc != NULL) {
6124                                 asoc->ifp_had_enobuf = 1;
6125                         }
6126                         SCTP_STAT_INCR(sctps_lowlevelerr);
6127                 }
6128         } else {
6129                 if (asoc != NULL) {
6130                         asoc->ifp_had_enobuf = 0;
6131                 }
6132         }
6133         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
6134 }
6135
6136 static void
6137 sctp_prune_prsctp(struct sctp_tcb *stcb,
6138     struct sctp_association *asoc,
6139     struct sctp_nonpad_sndrcvinfo *srcv,
6140     int dataout)
6141 {
6142         int freed_spc = 0;
6143         struct sctp_tmit_chunk *chk, *nchk;
6144
6145         SCTP_TCB_LOCK_ASSERT(stcb);
6146         if ((asoc->prsctp_supported) &&
6147             (asoc->sent_queue_cnt_removeable > 0)) {
6148                 TAILQ_FOREACH(chk, &asoc->sent_queue, sctp_next) {
6149                         /*
6150                          * Look for chunks marked with the PR_SCTP flag AND
6151                          * the buffer space flag. If the one being sent is
6152                          * equal or greater priority then purge the old one
6153                          * and free some space.
6154                          */
6155                         if (PR_SCTP_BUF_ENABLED(chk->flags)) {
6156                                 /*
6157                                  * This one is PR-SCTP AND buffer space
6158                                  * limited type
6159                                  */
6160                                 if (chk->rec.data.timetodrop.tv_sec > (long)srcv->sinfo_timetolive) {
6161                                         /*
6162                                          * Lower numbers equates to higher
6163                                          * priority. So if the one we are
6164                                          * looking at has a larger priority,
6165                                          * we want to drop the data and NOT
6166                                          * retransmit it.
6167                                          */
6168                                         if (chk->data) {
6169                                                 /*
6170                                                  * We release the book_size
6171                                                  * if the mbuf is here
6172                                                  */
6173                                                 int ret_spc;
6174                                                 uint8_t sent;
6175
6176                                                 if (chk->sent > SCTP_DATAGRAM_UNSENT)
6177                                                         sent = 1;
6178                                                 else
6179                                                         sent = 0;
6180                                                 ret_spc = sctp_release_pr_sctp_chunk(stcb, chk,
6181                                                     sent,
6182                                                     SCTP_SO_LOCKED);
6183                                                 freed_spc += ret_spc;
6184                                                 if (freed_spc >= dataout) {
6185                                                         return;
6186                                                 }
6187                                         }       /* if chunk was present */
6188                                 }       /* if of sufficient priority */
6189                         }       /* if chunk has enabled */
6190                 }               /* tailqforeach */
6191
6192                 TAILQ_FOREACH_SAFE(chk, &asoc->send_queue, sctp_next, nchk) {
6193                         /* Here we must move to the sent queue and mark */
6194                         if (PR_SCTP_BUF_ENABLED(chk->flags)) {
6195                                 if (chk->rec.data.timetodrop.tv_sec > (long)srcv->sinfo_timetolive) {
6196                                         if (chk->data) {
6197                                                 /*
6198                                                  * We release the book_size
6199                                                  * if the mbuf is here
6200                                                  */
6201                                                 int ret_spc;
6202
6203                                                 ret_spc = sctp_release_pr_sctp_chunk(stcb, chk,
6204                                                     0, SCTP_SO_LOCKED);
6205
6206                                                 freed_spc += ret_spc;
6207                                                 if (freed_spc >= dataout) {
6208                                                         return;
6209                                                 }
6210                                         }       /* end if chk->data */
6211                                 }       /* end if right class */
6212                         }       /* end if chk pr-sctp */
6213                 }               /* tailqforeachsafe (chk) */
6214         }                       /* if enabled in asoc */
6215 }
6216
6217 uint32_t
6218 sctp_get_frag_point(struct sctp_tcb *stcb)
6219 {
6220         struct sctp_association *asoc;
6221         uint32_t frag_point, overhead;
6222
6223         asoc = &stcb->asoc;
6224         /* Consider IP header and SCTP common header. */
6225         if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
6226                 overhead = SCTP_MIN_OVERHEAD;
6227         } else {
6228                 overhead = SCTP_MIN_V4_OVERHEAD;
6229         }
6230         /* Consider DATA/IDATA chunk header and AUTH header, if needed. */
6231         if (asoc->idata_supported) {
6232                 overhead += sizeof(struct sctp_idata_chunk);
6233                 if (sctp_auth_is_required_chunk(SCTP_IDATA, asoc->peer_auth_chunks)) {
6234                         overhead += sctp_get_auth_chunk_len(asoc->peer_hmac_id);
6235                 }
6236         } else {
6237                 overhead += sizeof(struct sctp_data_chunk);
6238                 if (sctp_auth_is_required_chunk(SCTP_DATA, asoc->peer_auth_chunks)) {
6239                         overhead += sctp_get_auth_chunk_len(asoc->peer_hmac_id);
6240                 }
6241         }
6242         KASSERT(overhead % 4 == 0,
6243             ("overhead (%u) not a multiple of 4", overhead));
6244         /* Consider padding. */
6245         if (asoc->smallest_mtu % 4 > 0) {
6246                 overhead += (asoc->smallest_mtu % 4);
6247         }
6248         KASSERT(asoc->smallest_mtu > overhead,
6249             ("Association MTU (%u) too small for overhead (%u)",
6250             asoc->smallest_mtu, overhead));
6251         frag_point = asoc->smallest_mtu - overhead;
6252         KASSERT(frag_point % 4 == 0,
6253             ("frag_point (%u) not a multiple of 4", frag_point));
6254         /* Honor MAXSEG socket option. */
6255         if ((asoc->sctp_frag_point > 0) &&
6256             (asoc->sctp_frag_point < frag_point)) {
6257                 frag_point = asoc->sctp_frag_point;
6258         }
6259         return (frag_point);
6260 }
6261
6262 static void
6263 sctp_set_prsctp_policy(struct sctp_stream_queue_pending *sp)
6264 {
6265         /*
6266          * We assume that the user wants PR_SCTP_TTL if the user provides a
6267          * positive lifetime but does not specify any PR_SCTP policy.
6268          */
6269         if (PR_SCTP_ENABLED(sp->sinfo_flags)) {
6270                 sp->act_flags |= PR_SCTP_POLICY(sp->sinfo_flags);
6271         } else if (sp->timetolive > 0) {
6272                 sp->sinfo_flags |= SCTP_PR_SCTP_TTL;
6273                 sp->act_flags |= PR_SCTP_POLICY(sp->sinfo_flags);
6274         } else {
6275                 return;
6276         }
6277         switch (PR_SCTP_POLICY(sp->sinfo_flags)) {
6278         case CHUNK_FLAGS_PR_SCTP_BUF:
6279                 /*
6280                  * Time to live is a priority stored in tv_sec when doing
6281                  * the buffer drop thing.
6282                  */
6283                 sp->ts.tv_sec = sp->timetolive;
6284                 sp->ts.tv_usec = 0;
6285                 break;
6286         case CHUNK_FLAGS_PR_SCTP_TTL:
6287                 {
6288                         struct timeval tv;
6289
6290                         (void)SCTP_GETTIME_TIMEVAL(&sp->ts);
6291                         tv.tv_sec = sp->timetolive / 1000;
6292                         tv.tv_usec = (sp->timetolive * 1000) % 1000000;
6293                         /*
6294                          * TODO sctp_constants.h needs alternative time
6295                          * macros when _KERNEL is undefined.
6296                          */
6297                         timevaladd(&sp->ts, &tv);
6298                 }
6299                 break;
6300         case CHUNK_FLAGS_PR_SCTP_RTX:
6301                 /*
6302                  * Time to live is a the number or retransmissions stored in
6303                  * tv_sec.
6304                  */
6305                 sp->ts.tv_sec = sp->timetolive;
6306                 sp->ts.tv_usec = 0;
6307                 break;
6308         default:
6309                 SCTPDBG(SCTP_DEBUG_USRREQ1,
6310                     "Unknown PR_SCTP policy %u.\n",
6311                     PR_SCTP_POLICY(sp->sinfo_flags));
6312                 break;
6313         }
6314 }
6315
6316 static int
6317 sctp_msg_append(struct sctp_tcb *stcb,
6318     struct sctp_nets *net,
6319     struct mbuf *m,
6320     struct sctp_nonpad_sndrcvinfo *srcv)
6321 {
6322         int error = 0;
6323         struct mbuf *at;
6324         struct sctp_stream_queue_pending *sp = NULL;
6325         struct sctp_stream_out *strm;
6326
6327         SCTP_TCB_LOCK_ASSERT(stcb);
6328
6329         /*
6330          * Given an mbuf chain, put it into the association send queue and
6331          * place it on the wheel
6332          */
6333         if (srcv->sinfo_stream >= stcb->asoc.streamoutcnt) {
6334                 /* Invalid stream number */
6335                 SCTP_LTRACE_ERR_RET_PKT(m, NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
6336                 error = EINVAL;
6337                 goto out_now;
6338         }
6339         if ((stcb->asoc.stream_locked) &&
6340             (stcb->asoc.stream_locked_on != srcv->sinfo_stream)) {
6341                 SCTP_LTRACE_ERR_RET_PKT(m, NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
6342                 error = EINVAL;
6343                 goto out_now;
6344         }
6345         /* Now can we send this? */
6346         if ((SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_SENT) ||
6347             (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_ACK_SENT) ||
6348             (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_RECEIVED) ||
6349             (stcb->asoc.state & SCTP_STATE_SHUTDOWN_PENDING)) {
6350                 /* got data while shutting down */
6351                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EPIPE);
6352                 error = EPIPE;
6353                 goto out_now;
6354         }
6355         sctp_alloc_a_strmoq(stcb, sp);
6356         if (sp == NULL) {
6357                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
6358                 error = ENOMEM;
6359                 goto out_now;
6360         }
6361         sp->sinfo_flags = srcv->sinfo_flags;
6362         sp->timetolive = srcv->sinfo_timetolive;
6363         sp->ppid = srcv->sinfo_ppid;
6364         sp->context = srcv->sinfo_context;
6365         sp->fsn = 0;
6366         if (sp->sinfo_flags & SCTP_ADDR_OVER) {
6367                 sp->net = net;
6368                 atomic_add_int(&sp->net->ref_count, 1);
6369         } else {
6370                 sp->net = NULL;
6371         }
6372         (void)SCTP_GETTIME_TIMEVAL(&sp->ts);
6373         sp->sid = srcv->sinfo_stream;
6374         sp->msg_is_complete = 1;
6375         sp->sender_all_done = 1;
6376         sp->some_taken = 0;
6377         sp->data = m;
6378         sp->tail_mbuf = NULL;
6379         sctp_set_prsctp_policy(sp);
6380         /*
6381          * We could in theory (for sendall) sifa the length in, but we would
6382          * still have to hunt through the chain since we need to setup the
6383          * tail_mbuf
6384          */
6385         sp->length = 0;
6386         for (at = m; at; at = SCTP_BUF_NEXT(at)) {
6387                 if (SCTP_BUF_NEXT(at) == NULL)
6388                         sp->tail_mbuf = at;
6389                 sp->length += SCTP_BUF_LEN(at);
6390         }
6391         if (srcv->sinfo_keynumber_valid) {
6392                 sp->auth_keyid = srcv->sinfo_keynumber;
6393         } else {
6394                 sp->auth_keyid = stcb->asoc.authinfo.active_keyid;
6395         }
6396         if (sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks)) {
6397                 sctp_auth_key_acquire(stcb, sp->auth_keyid);
6398                 sp->holds_key_ref = 1;
6399         }
6400         strm = &stcb->asoc.strmout[srcv->sinfo_stream];
6401         sctp_snd_sb_alloc(stcb, sp->length);
6402         atomic_add_int(&stcb->asoc.stream_queue_cnt, 1);
6403         TAILQ_INSERT_TAIL(&strm->outqueue, sp, next);
6404         stcb->asoc.ss_functions.sctp_ss_add_to_stream(stcb, &stcb->asoc, strm, sp);
6405         m = NULL;
6406 out_now:
6407         if (m) {
6408                 sctp_m_freem(m);
6409         }
6410         return (error);
6411 }
6412
6413 static struct mbuf *
6414 sctp_copy_mbufchain(struct mbuf *clonechain,
6415     struct mbuf *outchain,
6416     struct mbuf **endofchain,
6417     int can_take_mbuf,
6418     int sizeofcpy,
6419     uint8_t copy_by_ref)
6420 {
6421         struct mbuf *m;
6422         struct mbuf *appendchain;
6423         caddr_t cp;
6424         int len;
6425
6426         if (endofchain == NULL) {
6427                 /* error */
6428 error_out:
6429                 if (outchain)
6430                         sctp_m_freem(outchain);
6431                 return (NULL);
6432         }
6433         if (can_take_mbuf) {
6434                 appendchain = clonechain;
6435         } else {
6436                 if (!copy_by_ref &&
6437                     (sizeofcpy <= (int)((((SCTP_BASE_SYSCTL(sctp_mbuf_threshold_count) - 1) * MLEN) + MHLEN)))) {
6438                         /* Its not in a cluster */
6439                         if (*endofchain == NULL) {
6440                                 /* lets get a mbuf cluster */
6441                                 if (outchain == NULL) {
6442                                         /* This is the general case */
6443                         new_mbuf:
6444                                         outchain = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_HEADER);
6445                                         if (outchain == NULL) {
6446                                                 goto error_out;
6447                                         }
6448                                         SCTP_BUF_LEN(outchain) = 0;
6449                                         *endofchain = outchain;
6450                                         /* get the prepend space */
6451                                         SCTP_BUF_RESV_UF(outchain, (SCTP_FIRST_MBUF_RESV + 4));
6452                                 } else {
6453                                         /*
6454                                          * We really should not get a NULL
6455                                          * in endofchain
6456                                          */
6457                                         /* find end */
6458                                         m = outchain;
6459                                         while (m) {
6460                                                 if (SCTP_BUF_NEXT(m) == NULL) {
6461                                                         *endofchain = m;
6462                                                         break;
6463                                                 }
6464                                                 m = SCTP_BUF_NEXT(m);
6465                                         }
6466                                         /* sanity */
6467                                         if (*endofchain == NULL) {
6468                                                 /*
6469                                                  * huh, TSNH XXX maybe we
6470                                                  * should panic
6471                                                  */
6472                                                 sctp_m_freem(outchain);
6473                                                 goto new_mbuf;
6474                                         }
6475                                 }
6476                                 /* get the new end of length */
6477                                 len = (int)M_TRAILINGSPACE(*endofchain);
6478                         } else {
6479                                 /* how much is left at the end? */
6480                                 len = (int)M_TRAILINGSPACE(*endofchain);
6481                         }
6482                         /* Find the end of the data, for appending */
6483                         cp = (mtod((*endofchain), caddr_t)+SCTP_BUF_LEN((*endofchain)));
6484
6485                         /* Now lets copy it out */
6486                         if (len >= sizeofcpy) {
6487                                 /* It all fits, copy it in */
6488                                 m_copydata(clonechain, 0, sizeofcpy, cp);
6489                                 SCTP_BUF_LEN((*endofchain)) += sizeofcpy;
6490                         } else {
6491                                 /* fill up the end of the chain */
6492                                 if (len > 0) {
6493                                         m_copydata(clonechain, 0, len, cp);
6494                                         SCTP_BUF_LEN((*endofchain)) += len;
6495                                         /* now we need another one */
6496                                         sizeofcpy -= len;
6497                                 }
6498                                 m = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_HEADER);
6499                                 if (m == NULL) {
6500                                         /* We failed */
6501                                         goto error_out;
6502                                 }
6503                                 SCTP_BUF_NEXT((*endofchain)) = m;
6504                                 *endofchain = m;
6505                                 cp = mtod((*endofchain), caddr_t);
6506                                 m_copydata(clonechain, len, sizeofcpy, cp);
6507                                 SCTP_BUF_LEN((*endofchain)) += sizeofcpy;
6508                         }
6509                         return (outchain);
6510                 } else {
6511                         /* copy the old fashion way */
6512                         appendchain = SCTP_M_COPYM(clonechain, 0, M_COPYALL, M_NOWAIT);
6513 #ifdef SCTP_MBUF_LOGGING
6514                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
6515                                 sctp_log_mbc(appendchain, SCTP_MBUF_ICOPY);
6516                         }
6517 #endif
6518                 }
6519         }
6520         if (appendchain == NULL) {
6521                 /* error */
6522                 if (outchain)
6523                         sctp_m_freem(outchain);
6524                 return (NULL);
6525         }
6526         if (outchain) {
6527                 /* tack on to the end */
6528                 if (*endofchain != NULL) {
6529                         SCTP_BUF_NEXT(((*endofchain))) = appendchain;
6530                 } else {
6531                         m = outchain;
6532                         while (m) {
6533                                 if (SCTP_BUF_NEXT(m) == NULL) {
6534                                         SCTP_BUF_NEXT(m) = appendchain;
6535                                         break;
6536                                 }
6537                                 m = SCTP_BUF_NEXT(m);
6538                         }
6539                 }
6540                 /*
6541                  * save off the end and update the end-chain position
6542                  */
6543                 m = appendchain;
6544                 while (m) {
6545                         if (SCTP_BUF_NEXT(m) == NULL) {
6546                                 *endofchain = m;
6547                                 break;
6548                         }
6549                         m = SCTP_BUF_NEXT(m);
6550                 }
6551                 return (outchain);
6552         } else {
6553                 /* save off the end and update the end-chain position */
6554                 m = appendchain;
6555                 while (m) {
6556                         if (SCTP_BUF_NEXT(m) == NULL) {
6557                                 *endofchain = m;
6558                                 break;
6559                         }
6560                         m = SCTP_BUF_NEXT(m);
6561                 }
6562                 return (appendchain);
6563         }
6564 }
6565
6566 static int
6567 sctp_med_chunk_output(struct sctp_inpcb *inp,
6568     struct sctp_tcb *stcb,
6569     struct sctp_association *asoc,
6570     int *num_out,
6571     int *reason_code,
6572     int control_only, int from_where,
6573     struct timeval *now, int *now_filled,
6574     uint32_t frag_point, int so_locked);
6575
6576 static void
6577 sctp_sendall_iterator(struct sctp_inpcb *inp, struct sctp_tcb *stcb, void *ptr,
6578     uint32_t val SCTP_UNUSED)
6579 {
6580         struct sctp_copy_all *ca;
6581         struct mbuf *m;
6582         int ret = 0;
6583         int added_control = 0;
6584         int un_sent, do_chunk_output = 1;
6585         struct sctp_association *asoc;
6586         struct sctp_nets *net;
6587
6588         ca = (struct sctp_copy_all *)ptr;
6589         if (ca->m == NULL) {
6590                 return;
6591         }
6592         if (ca->inp != inp) {
6593                 /* TSNH */
6594                 return;
6595         }
6596         if (ca->sndlen > 0) {
6597                 m = SCTP_M_COPYM(ca->m, 0, M_COPYALL, M_NOWAIT);
6598                 if (m == NULL) {
6599                         /* can't copy so we are done */
6600                         ca->cnt_failed++;
6601                         return;
6602                 }
6603 #ifdef SCTP_MBUF_LOGGING
6604                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
6605                         sctp_log_mbc(m, SCTP_MBUF_ICOPY);
6606                 }
6607 #endif
6608         } else {
6609                 m = NULL;
6610         }
6611         SCTP_TCB_LOCK_ASSERT(stcb);
6612         if (stcb->asoc.alternate) {
6613                 net = stcb->asoc.alternate;
6614         } else {
6615                 net = stcb->asoc.primary_destination;
6616         }
6617         if (ca->sndrcv.sinfo_flags & SCTP_ABORT) {
6618                 /* Abort this assoc with m as the user defined reason */
6619                 if (m != NULL) {
6620                         SCTP_BUF_PREPEND(m, sizeof(struct sctp_paramhdr), M_NOWAIT);
6621                 } else {
6622                         m = sctp_get_mbuf_for_msg(sizeof(struct sctp_paramhdr),
6623                             0, M_NOWAIT, 1, MT_DATA);
6624                         SCTP_BUF_LEN(m) = sizeof(struct sctp_paramhdr);
6625                 }
6626                 if (m != NULL) {
6627                         struct sctp_paramhdr *ph;
6628
6629                         ph = mtod(m, struct sctp_paramhdr *);
6630                         ph->param_type = htons(SCTP_CAUSE_USER_INITIATED_ABT);
6631                         ph->param_length = htons((uint16_t)(sizeof(struct sctp_paramhdr) + ca->sndlen));
6632                 }
6633                 /*
6634                  * We add one here to keep the assoc from dis-appearing on
6635                  * us.
6636                  */
6637                 atomic_add_int(&stcb->asoc.refcnt, 1);
6638                 sctp_abort_an_association(inp, stcb, m, false, SCTP_SO_NOT_LOCKED);
6639                 /*
6640                  * sctp_abort_an_association calls sctp_free_asoc() free
6641                  * association will NOT free it since we incremented the
6642                  * refcnt .. we do this to prevent it being freed and things
6643                  * getting tricky since we could end up (from free_asoc)
6644                  * calling inpcb_free which would get a recursive lock call
6645                  * to the iterator lock.. But as a consequence of that the
6646                  * stcb will return to us un-locked.. since free_asoc
6647                  * returns with either no TCB or the TCB unlocked, we must
6648                  * relock.. to unlock in the iterator timer :-0
6649                  */
6650                 SCTP_TCB_LOCK(stcb);
6651                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
6652                 goto no_chunk_output;
6653         } else {
6654                 if (m != NULL) {
6655                         ret = sctp_msg_append(stcb, net, m, &ca->sndrcv);
6656                 }
6657                 asoc = &stcb->asoc;
6658                 if (ca->sndrcv.sinfo_flags & SCTP_EOF) {
6659                         /* shutdown this assoc */
6660                         if (TAILQ_EMPTY(&asoc->send_queue) &&
6661                             TAILQ_EMPTY(&asoc->sent_queue) &&
6662                             sctp_is_there_unsent_data(stcb, SCTP_SO_NOT_LOCKED) == 0) {
6663                                 if ((*asoc->ss_functions.sctp_ss_is_user_msgs_incomplete) (stcb, asoc)) {
6664                                         goto abort_anyway;
6665                                 }
6666                                 /*
6667                                  * there is nothing queued to send, so I'm
6668                                  * done...
6669                                  */
6670                                 if ((SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_SENT) &&
6671                                     (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
6672                                     (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
6673                                         /*
6674                                          * only send SHUTDOWN the first time
6675                                          * through
6676                                          */
6677                                         if (SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) {
6678                                                 SCTP_STAT_DECR_GAUGE32(sctps_currestab);
6679                                         }
6680                                         SCTP_SET_STATE(stcb, SCTP_STATE_SHUTDOWN_SENT);
6681                                         sctp_stop_timers_for_shutdown(stcb);
6682                                         sctp_send_shutdown(stcb, net);
6683                                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb,
6684                                             net);
6685                                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
6686                                             NULL);
6687                                         added_control = 1;
6688                                         do_chunk_output = 0;
6689                                 }
6690                         } else {
6691                                 /*
6692                                  * we still got (or just got) data to send,
6693                                  * so set SHUTDOWN_PENDING
6694                                  */
6695                                 /*
6696                                  * XXX sockets draft says that SCTP_EOF
6697                                  * should be sent with no data.  currently,
6698                                  * we will allow user data to be sent first
6699                                  * and move to SHUTDOWN-PENDING
6700                                  */
6701                                 if ((SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_SENT) &&
6702                                     (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
6703                                     (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
6704                                         if ((*asoc->ss_functions.sctp_ss_is_user_msgs_incomplete) (stcb, asoc)) {
6705                                                 SCTP_ADD_SUBSTATE(stcb, SCTP_STATE_PARTIAL_MSG_LEFT);
6706                                         }
6707                                         SCTP_ADD_SUBSTATE(stcb, SCTP_STATE_SHUTDOWN_PENDING);
6708                                         if (TAILQ_EMPTY(&asoc->send_queue) &&
6709                                             TAILQ_EMPTY(&asoc->sent_queue) &&
6710                                             (asoc->state & SCTP_STATE_PARTIAL_MSG_LEFT)) {
6711                                                 struct mbuf *op_err;
6712                                                 char msg[SCTP_DIAG_INFO_LEN];
6713
6714                                 abort_anyway:
6715                                                 SCTP_SNPRINTF(msg, sizeof(msg),
6716                                                     "%s:%d at %s", __FILE__, __LINE__, __func__);
6717                                                 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
6718                                                     msg);
6719                                                 atomic_add_int(&stcb->asoc.refcnt, 1);
6720                                                 sctp_abort_an_association(stcb->sctp_ep, stcb,
6721                                                     op_err, false, SCTP_SO_NOT_LOCKED);
6722                                                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
6723                                                 goto no_chunk_output;
6724                                         }
6725                                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
6726                                             NULL);
6727                                 }
6728                         }
6729                 }
6730         }
6731         un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
6732             (stcb->asoc.stream_queue_cnt * SCTP_DATA_CHUNK_OVERHEAD(stcb)));
6733
6734         if ((sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY)) &&
6735             (stcb->asoc.total_flight > 0) &&
6736             (un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD))) {
6737                 do_chunk_output = 0;
6738         }
6739         if (do_chunk_output)
6740                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_NOT_LOCKED);
6741         else if (added_control) {
6742                 struct timeval now;
6743                 int num_out, reason, now_filled = 0;
6744
6745                 (void)sctp_med_chunk_output(inp, stcb, &stcb->asoc, &num_out,
6746                     &reason, 1, 1, &now, &now_filled,
6747                     sctp_get_frag_point(stcb),
6748                     SCTP_SO_NOT_LOCKED);
6749         }
6750 no_chunk_output:
6751         if (ret) {
6752                 ca->cnt_failed++;
6753         } else {
6754                 ca->cnt_sent++;
6755         }
6756 }
6757
6758 static void
6759 sctp_sendall_completes(void *ptr, uint32_t val SCTP_UNUSED)
6760 {
6761         struct sctp_copy_all *ca;
6762
6763         ca = (struct sctp_copy_all *)ptr;
6764         /*
6765          * Do a notify here? Kacheong suggests that the notify be done at
6766          * the send time.. so you would push up a notification if any send
6767          * failed. Don't know if this is feasible since the only failures we
6768          * have is "memory" related and if you cannot get an mbuf to send
6769          * the data you surely can't get an mbuf to send up to notify the
6770          * user you can't send the data :->
6771          */
6772
6773         /* now free everything */
6774         if (ca->inp) {
6775                 /* Lets clear the flag to allow others to run. */
6776                 SCTP_INP_WLOCK(ca->inp);
6777                 ca->inp->sctp_flags &= ~SCTP_PCB_FLAGS_SND_ITERATOR_UP;
6778                 SCTP_INP_WUNLOCK(ca->inp);
6779         }
6780         sctp_m_freem(ca->m);
6781         SCTP_FREE(ca, SCTP_M_COPYAL);
6782 }
6783
6784 static struct mbuf *
6785 sctp_copy_out_all(struct uio *uio, ssize_t len)
6786 {
6787         struct mbuf *ret, *at;
6788         ssize_t left, willcpy, cancpy, error;
6789
6790         ret = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_WAITOK, 1, MT_DATA);
6791         if (ret == NULL) {
6792                 /* TSNH */
6793                 return (NULL);
6794         }
6795         left = len;
6796         SCTP_BUF_LEN(ret) = 0;
6797         /* save space for the data chunk header */
6798         cancpy = (int)M_TRAILINGSPACE(ret);
6799         willcpy = min(cancpy, left);
6800         at = ret;
6801         while (left > 0) {
6802                 /* Align data to the end */
6803                 error = uiomove(mtod(at, caddr_t), (int)willcpy, uio);
6804                 if (error) {
6805         err_out_now:
6806                         sctp_m_freem(at);
6807                         return (NULL);
6808                 }
6809                 SCTP_BUF_LEN(at) = (int)willcpy;
6810                 SCTP_BUF_NEXT_PKT(at) = SCTP_BUF_NEXT(at) = 0;
6811                 left -= willcpy;
6812                 if (left > 0) {
6813                         SCTP_BUF_NEXT(at) = sctp_get_mbuf_for_msg((unsigned int)left, 0, M_WAITOK, 1, MT_DATA);
6814                         if (SCTP_BUF_NEXT(at) == NULL) {
6815                                 goto err_out_now;
6816                         }
6817                         at = SCTP_BUF_NEXT(at);
6818                         SCTP_BUF_LEN(at) = 0;
6819                         cancpy = (int)M_TRAILINGSPACE(at);
6820                         willcpy = min(cancpy, left);
6821                 }
6822         }
6823         return (ret);
6824 }
6825
6826 static int
6827 sctp_sendall(struct sctp_inpcb *inp, struct uio *uio, struct mbuf *m,
6828     struct sctp_nonpad_sndrcvinfo *srcv)
6829 {
6830         int ret;
6831         struct sctp_copy_all *ca;
6832
6833         if (uio->uio_resid > (ssize_t)SCTP_BASE_SYSCTL(sctp_sendall_limit)) {
6834                 /* You must not be larger than the limit! */
6835                 return (EMSGSIZE);
6836         }
6837         SCTP_MALLOC(ca, struct sctp_copy_all *, sizeof(struct sctp_copy_all),
6838             SCTP_M_COPYAL);
6839         if (ca == NULL) {
6840                 sctp_m_freem(m);
6841                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
6842                 return (ENOMEM);
6843         }
6844         memset(ca, 0, sizeof(struct sctp_copy_all));
6845
6846         ca->inp = inp;
6847         if (srcv != NULL) {
6848                 memcpy(&ca->sndrcv, srcv, sizeof(struct sctp_nonpad_sndrcvinfo));
6849         }
6850
6851         /* Serialize. */
6852         SCTP_INP_WLOCK(inp);
6853         if ((inp->sctp_flags & SCTP_PCB_FLAGS_SND_ITERATOR_UP) != 0) {
6854                 SCTP_INP_WUNLOCK(inp);
6855                 sctp_m_freem(m);
6856                 SCTP_FREE(ca, SCTP_M_COPYAL);
6857                 return (EBUSY);
6858         }
6859         inp->sctp_flags |= SCTP_PCB_FLAGS_SND_ITERATOR_UP;
6860         SCTP_INP_WUNLOCK(inp);
6861
6862         /*
6863          * take off the sendall flag, it would be bad if we failed to do
6864          * this :-0
6865          */
6866         ca->sndrcv.sinfo_flags &= ~SCTP_SENDALL;
6867         /* get length and mbuf chain */
6868         if (uio) {
6869                 ca->sndlen = uio->uio_resid;
6870                 ca->m = sctp_copy_out_all(uio, ca->sndlen);
6871                 if (ca->m == NULL) {
6872                         SCTP_FREE(ca, SCTP_M_COPYAL);
6873                         sctp_m_freem(m);
6874                         SCTP_INP_WLOCK(inp);
6875                         inp->sctp_flags &= ~SCTP_PCB_FLAGS_SND_ITERATOR_UP;
6876                         SCTP_INP_WUNLOCK(inp);
6877                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
6878                         return (ENOMEM);
6879                 }
6880         } else {
6881                 /* Gather the length of the send */
6882                 struct mbuf *mat;
6883
6884                 ca->sndlen = 0;
6885                 for (mat = m; mat; mat = SCTP_BUF_NEXT(mat)) {
6886                         ca->sndlen += SCTP_BUF_LEN(mat);
6887                 }
6888         }
6889         ret = sctp_initiate_iterator(NULL, sctp_sendall_iterator, NULL,
6890             SCTP_PCB_ANY_FLAGS, SCTP_PCB_ANY_FEATURES,
6891             SCTP_ASOC_ANY_STATE,
6892             (void *)ca, 0,
6893             sctp_sendall_completes, inp, 1);
6894         if (ret) {
6895                 SCTP_INP_WLOCK(inp);
6896                 inp->sctp_flags &= ~SCTP_PCB_FLAGS_SND_ITERATOR_UP;
6897                 SCTP_INP_WUNLOCK(inp);
6898                 SCTP_FREE(ca, SCTP_M_COPYAL);
6899                 SCTP_LTRACE_ERR_RET_PKT(m, inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EFAULT);
6900                 return (EFAULT);
6901         }
6902         return (0);
6903 }
6904
6905 void
6906 sctp_toss_old_cookies(struct sctp_tcb *stcb, struct sctp_association *asoc)
6907 {
6908         struct sctp_tmit_chunk *chk, *nchk;
6909
6910         TAILQ_FOREACH_SAFE(chk, &asoc->control_send_queue, sctp_next, nchk) {
6911                 if (chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
6912                         TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
6913                         asoc->ctrl_queue_cnt--;
6914                         if (chk->data) {
6915                                 sctp_m_freem(chk->data);
6916                                 chk->data = NULL;
6917                         }
6918                         sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
6919                 }
6920         }
6921 }
6922
6923 void
6924 sctp_toss_old_asconf(struct sctp_tcb *stcb)
6925 {
6926         struct sctp_association *asoc;
6927         struct sctp_tmit_chunk *chk, *nchk;
6928         struct sctp_asconf_chunk *acp;
6929
6930         asoc = &stcb->asoc;
6931         TAILQ_FOREACH_SAFE(chk, &asoc->asconf_send_queue, sctp_next, nchk) {
6932                 /* find SCTP_ASCONF chunk in queue */
6933                 if (chk->rec.chunk_id.id == SCTP_ASCONF) {
6934                         if (chk->data) {
6935                                 acp = mtod(chk->data, struct sctp_asconf_chunk *);
6936                                 if (SCTP_TSN_GT(ntohl(acp->serial_number), asoc->asconf_seq_out_acked)) {
6937                                         /* Not Acked yet */
6938                                         break;
6939                                 }
6940                         }
6941                         TAILQ_REMOVE(&asoc->asconf_send_queue, chk, sctp_next);
6942                         asoc->ctrl_queue_cnt--;
6943                         if (chk->data) {
6944                                 sctp_m_freem(chk->data);
6945                                 chk->data = NULL;
6946                         }
6947                         sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
6948                 }
6949         }
6950 }
6951
6952 static void
6953 sctp_clean_up_datalist(struct sctp_tcb *stcb,
6954     struct sctp_association *asoc,
6955     struct sctp_tmit_chunk **data_list,
6956     int bundle_at,
6957     struct sctp_nets *net)
6958 {
6959         int i;
6960         struct sctp_tmit_chunk *tp1;
6961
6962         for (i = 0; i < bundle_at; i++) {
6963                 /* off of the send queue */
6964                 TAILQ_REMOVE(&asoc->send_queue, data_list[i], sctp_next);
6965                 asoc->send_queue_cnt--;
6966                 if (i > 0) {
6967                         /*
6968                          * Any chunk NOT 0 you zap the time chunk 0 gets
6969                          * zapped or set based on if a RTO measurement is
6970                          * needed.
6971                          */
6972                         data_list[i]->do_rtt = 0;
6973                 }
6974                 /* record time */
6975                 data_list[i]->sent_rcv_time = net->last_sent_time;
6976                 data_list[i]->rec.data.cwnd_at_send = net->cwnd;
6977                 data_list[i]->rec.data.fast_retran_tsn = data_list[i]->rec.data.tsn;
6978                 if (data_list[i]->whoTo == NULL) {
6979                         data_list[i]->whoTo = net;
6980                         atomic_add_int(&net->ref_count, 1);
6981                 }
6982                 /* on to the sent queue */
6983                 tp1 = TAILQ_LAST(&asoc->sent_queue, sctpchunk_listhead);
6984                 if ((tp1) && SCTP_TSN_GT(tp1->rec.data.tsn, data_list[i]->rec.data.tsn)) {
6985                         struct sctp_tmit_chunk *tpp;
6986
6987                         /* need to move back */
6988         back_up_more:
6989                         tpp = TAILQ_PREV(tp1, sctpchunk_listhead, sctp_next);
6990                         if (tpp == NULL) {
6991                                 TAILQ_INSERT_BEFORE(tp1, data_list[i], sctp_next);
6992                                 goto all_done;
6993                         }
6994                         tp1 = tpp;
6995                         if (SCTP_TSN_GT(tp1->rec.data.tsn, data_list[i]->rec.data.tsn)) {
6996                                 goto back_up_more;
6997                         }
6998                         TAILQ_INSERT_AFTER(&asoc->sent_queue, tp1, data_list[i], sctp_next);
6999                 } else {
7000                         TAILQ_INSERT_TAIL(&asoc->sent_queue,
7001                             data_list[i],
7002                             sctp_next);
7003                 }
7004 all_done:
7005                 /* This does not lower until the cum-ack passes it */
7006                 asoc->sent_queue_cnt++;
7007                 if ((asoc->peers_rwnd <= 0) &&
7008                     (asoc->total_flight == 0) &&
7009                     (bundle_at == 1)) {
7010                         /* Mark the chunk as being a window probe */
7011                         SCTP_STAT_INCR(sctps_windowprobed);
7012                 }
7013 #ifdef SCTP_AUDITING_ENABLED
7014                 sctp_audit_log(0xC2, 3);
7015 #endif
7016                 data_list[i]->sent = SCTP_DATAGRAM_SENT;
7017                 data_list[i]->snd_count = 1;
7018                 data_list[i]->rec.data.chunk_was_revoked = 0;
7019                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
7020                         sctp_misc_ints(SCTP_FLIGHT_LOG_UP,
7021                             data_list[i]->whoTo->flight_size,
7022                             data_list[i]->book_size,
7023                             (uint32_t)(uintptr_t)data_list[i]->whoTo,
7024                             data_list[i]->rec.data.tsn);
7025                 }
7026                 sctp_flight_size_increase(data_list[i]);
7027                 sctp_total_flight_increase(stcb, data_list[i]);
7028                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_RWND_ENABLE) {
7029                         sctp_log_rwnd(SCTP_DECREASE_PEER_RWND,
7030                             asoc->peers_rwnd, data_list[i]->send_size, SCTP_BASE_SYSCTL(sctp_peer_chunk_oh));
7031                 }
7032                 asoc->peers_rwnd = sctp_sbspace_sub(asoc->peers_rwnd,
7033                     (uint32_t)(data_list[i]->send_size + SCTP_BASE_SYSCTL(sctp_peer_chunk_oh)));
7034                 if (asoc->peers_rwnd < stcb->sctp_ep->sctp_ep.sctp_sws_sender) {
7035                         /* SWS sender side engages */
7036                         asoc->peers_rwnd = 0;
7037                 }
7038         }
7039         if (asoc->cc_functions.sctp_cwnd_update_packet_transmitted) {
7040                 (*asoc->cc_functions.sctp_cwnd_update_packet_transmitted) (stcb, net);
7041         }
7042 }
7043
7044 static void
7045 sctp_clean_up_ctl(struct sctp_tcb *stcb, struct sctp_association *asoc, int so_locked)
7046 {
7047         struct sctp_tmit_chunk *chk, *nchk;
7048
7049         TAILQ_FOREACH_SAFE(chk, &asoc->control_send_queue, sctp_next, nchk) {
7050                 if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
7051                     (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK) ||  /* EY */
7052                     (chk->rec.chunk_id.id == SCTP_HEARTBEAT_REQUEST) ||
7053                     (chk->rec.chunk_id.id == SCTP_HEARTBEAT_ACK) ||
7054                     (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN) ||
7055                     (chk->rec.chunk_id.id == SCTP_SHUTDOWN) ||
7056                     (chk->rec.chunk_id.id == SCTP_SHUTDOWN_ACK) ||
7057                     (chk->rec.chunk_id.id == SCTP_OPERATION_ERROR) ||
7058                     (chk->rec.chunk_id.id == SCTP_PACKET_DROPPED) ||
7059                     (chk->rec.chunk_id.id == SCTP_COOKIE_ACK) ||
7060                     (chk->rec.chunk_id.id == SCTP_ECN_CWR) ||
7061                     (chk->rec.chunk_id.id == SCTP_ASCONF_ACK)) {
7062                         /* Stray chunks must be cleaned up */
7063         clean_up_anyway:
7064                         TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
7065                         asoc->ctrl_queue_cnt--;
7066                         if (chk->data) {
7067                                 sctp_m_freem(chk->data);
7068                                 chk->data = NULL;
7069                         }
7070                         if (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN) {
7071                                 asoc->fwd_tsn_cnt--;
7072                         }
7073                         sctp_free_a_chunk(stcb, chk, so_locked);
7074                 } else if (chk->rec.chunk_id.id == SCTP_STREAM_RESET) {
7075                         /* special handling, we must look into the param */
7076                         if (chk != asoc->str_reset) {
7077                                 goto clean_up_anyway;
7078                         }
7079                 }
7080         }
7081 }
7082
7083 static uint32_t
7084 sctp_can_we_split_this(struct sctp_tcb *stcb, uint32_t length,
7085     uint32_t space_left, uint32_t frag_point, int eeor_on)
7086 {
7087         /*
7088          * Make a decision on if I should split a msg into multiple parts.
7089          * This is only asked of incomplete messages.
7090          */
7091         if (eeor_on) {
7092                 /*
7093                  * If we are doing EEOR we need to always send it if its the
7094                  * entire thing, since it might be all the guy is putting in
7095                  * the hopper.
7096                  */
7097                 if (space_left >= length) {
7098                         /*-
7099                          * If we have data outstanding,
7100                          * we get another chance when the sack
7101                          * arrives to transmit - wait for more data
7102                          */
7103                         if (stcb->asoc.total_flight == 0) {
7104                                 /*
7105                                  * If nothing is in flight, we zero the
7106                                  * packet counter.
7107                                  */
7108                                 return (length);
7109                         }
7110                         return (0);
7111
7112                 } else {
7113                         /* You can fill the rest */
7114                         return (space_left);
7115                 }
7116         }
7117         /*-
7118          * For those strange folk that make the send buffer
7119          * smaller than our fragmentation point, we can't
7120          * get a full msg in so we have to allow splitting.
7121          */
7122         if (SCTP_SB_LIMIT_SND(stcb->sctp_socket) < frag_point) {
7123                 return (length);
7124         }
7125         if ((length <= space_left) ||
7126             ((length - space_left) < SCTP_BASE_SYSCTL(sctp_min_residual))) {
7127                 /* Sub-optimal residual don't split in non-eeor mode. */
7128                 return (0);
7129         }
7130         /*
7131          * If we reach here length is larger than the space_left. Do we wish
7132          * to split it for the sake of packet putting together?
7133          */
7134         if (space_left >= min(SCTP_BASE_SYSCTL(sctp_min_split_point), frag_point)) {
7135                 /* Its ok to split it */
7136                 return (min(space_left, frag_point));
7137         }
7138         /* Nope, can't split */
7139         return (0);
7140 }
7141
7142 static uint32_t
7143 sctp_move_to_outqueue(struct sctp_tcb *stcb,
7144     struct sctp_nets *net,
7145     struct sctp_stream_out *strq,
7146     uint32_t space_left,
7147     uint32_t frag_point,
7148     int *giveup,
7149     int eeor_mode,
7150     int *bail,
7151     int so_locked)
7152 {
7153         /* Move from the stream to the send_queue keeping track of the total */
7154         struct sctp_association *asoc;
7155         struct sctp_stream_queue_pending *sp;
7156         struct sctp_tmit_chunk *chk;
7157         struct sctp_data_chunk *dchkh = NULL;
7158         struct sctp_idata_chunk *ndchkh = NULL;
7159         uint32_t to_move, length;
7160         int leading;
7161         uint8_t rcv_flags = 0;
7162         uint8_t some_taken;
7163
7164         SCTP_TCB_LOCK_ASSERT(stcb);
7165         asoc = &stcb->asoc;
7166 one_more_time:
7167         /* sa_ignore FREED_MEMORY */
7168         sp = TAILQ_FIRST(&strq->outqueue);
7169         if (sp == NULL) {
7170                 sp = TAILQ_FIRST(&strq->outqueue);
7171                 if (sp) {
7172                         goto one_more_time;
7173                 }
7174                 if ((sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_EXPLICIT_EOR) == 0) &&
7175                     (stcb->asoc.idata_supported == 0) &&
7176                     (strq->last_msg_incomplete)) {
7177                         SCTP_PRINTF("Huh? Stream:%d lm_in_c=%d but queue is NULL\n",
7178                             strq->sid,
7179                             strq->last_msg_incomplete);
7180                         strq->last_msg_incomplete = 0;
7181                 }
7182                 to_move = 0;
7183                 goto out_of;
7184         }
7185         if ((sp->msg_is_complete) && (sp->length == 0)) {
7186                 if (sp->sender_all_done) {
7187                         /*
7188                          * We are doing deferred cleanup. Last time through
7189                          * when we took all the data the sender_all_done was
7190                          * not set.
7191                          */
7192                         if ((sp->put_last_out == 0) && (sp->discard_rest == 0)) {
7193                                 SCTP_PRINTF("Gak, put out entire msg with NO end!-1\n");
7194                                 SCTP_PRINTF("sender_done:%d len:%d msg_comp:%d put_last_out:%d\n",
7195                                     sp->sender_all_done,
7196                                     sp->length,
7197                                     sp->msg_is_complete,
7198                                     sp->put_last_out);
7199                         }
7200                         atomic_subtract_int(&asoc->stream_queue_cnt, 1);
7201                         TAILQ_REMOVE(&strq->outqueue, sp, next);
7202                         stcb->asoc.ss_functions.sctp_ss_remove_from_stream(stcb, asoc, strq, sp);
7203                         if ((strq->state == SCTP_STREAM_RESET_PENDING) &&
7204                             (strq->chunks_on_queues == 0) &&
7205                             TAILQ_EMPTY(&strq->outqueue)) {
7206                                 stcb->asoc.trigger_reset = 1;
7207                         }
7208                         if (sp->net) {
7209                                 sctp_free_remote_addr(sp->net);
7210                                 sp->net = NULL;
7211                         }
7212                         if (sp->data) {
7213                                 sctp_m_freem(sp->data);
7214                                 sp->data = NULL;
7215                         }
7216                         sctp_free_a_strmoq(stcb, sp, so_locked);
7217                         /* back to get the next msg */
7218                         goto one_more_time;
7219                 } else {
7220                         /*
7221                          * sender just finished this but still holds a
7222                          * reference
7223                          */
7224                         *giveup = 1;
7225                         to_move = 0;
7226                         goto out_of;
7227                 }
7228         } else {
7229                 /* is there some to get */
7230                 if (sp->length == 0) {
7231                         /* no */
7232                         *giveup = 1;
7233                         to_move = 0;
7234                         goto out_of;
7235                 } else if (sp->discard_rest) {
7236                         /* Whack down the size */
7237                         atomic_subtract_int(&stcb->asoc.total_output_queue_size, sp->length);
7238                         if ((stcb->sctp_socket != NULL) &&
7239                             ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
7240                             (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL))) {
7241                                 atomic_subtract_int(&stcb->sctp_socket->so_snd.sb_cc, sp->length);
7242                         }
7243                         if (sp->data) {
7244                                 sctp_m_freem(sp->data);
7245                                 sp->data = NULL;
7246                                 sp->tail_mbuf = NULL;
7247                         }
7248                         sp->length = 0;
7249                         sp->some_taken = 1;
7250                         *giveup = 1;
7251                         to_move = 0;
7252                         goto out_of;
7253                 }
7254         }
7255         some_taken = sp->some_taken;
7256         length = sp->length;
7257         if (sp->msg_is_complete) {
7258                 /* The message is complete */
7259                 to_move = min(length, frag_point);
7260                 if (to_move == length) {
7261                         /* All of it fits in the MTU */
7262                         if (sp->some_taken) {
7263                                 rcv_flags |= SCTP_DATA_LAST_FRAG;
7264                         } else {
7265                                 rcv_flags |= SCTP_DATA_NOT_FRAG;
7266                         }
7267                         sp->put_last_out = 1;
7268                         if (sp->sinfo_flags & SCTP_SACK_IMMEDIATELY) {
7269                                 rcv_flags |= SCTP_DATA_SACK_IMMEDIATELY;
7270                         }
7271                 } else {
7272                         /* Not all of it fits, we fragment */
7273                         if (sp->some_taken == 0) {
7274                                 rcv_flags |= SCTP_DATA_FIRST_FRAG;
7275                         }
7276                         sp->some_taken = 1;
7277                 }
7278         } else {
7279                 to_move = sctp_can_we_split_this(stcb, length, space_left, frag_point, eeor_mode);
7280                 if (to_move > 0) {
7281                         if (to_move >= length) {
7282                                 to_move = length;
7283                         }
7284                         if (sp->some_taken == 0) {
7285                                 rcv_flags |= SCTP_DATA_FIRST_FRAG;
7286                                 sp->some_taken = 1;
7287                         }
7288                 } else {
7289                         /* Nothing to take. */
7290                         *giveup = 1;
7291                         to_move = 0;
7292                         goto out_of;
7293                 }
7294         }
7295
7296         /* If we reach here, we can copy out a chunk */
7297         sctp_alloc_a_chunk(stcb, chk);
7298         if (chk == NULL) {
7299                 /* No chunk memory */
7300                 *giveup = 1;
7301                 to_move = 0;
7302                 goto out_of;
7303         }
7304         /*
7305          * Setup for unordered if needed by looking at the user sent info
7306          * flags.
7307          */
7308         if (sp->sinfo_flags & SCTP_UNORDERED) {
7309                 rcv_flags |= SCTP_DATA_UNORDERED;
7310         }
7311         if (SCTP_BASE_SYSCTL(sctp_enable_sack_immediately) &&
7312             (sp->sinfo_flags & SCTP_EOF) == SCTP_EOF) {
7313                 rcv_flags |= SCTP_DATA_SACK_IMMEDIATELY;
7314         }
7315         /* clear out the chunk before setting up */
7316         memset(chk, 0, sizeof(*chk));
7317         chk->rec.data.rcv_flags = rcv_flags;
7318
7319         if (to_move >= length) {
7320                 /* we think we can steal the whole thing */
7321                 if (to_move < sp->length) {
7322                         /* bail, it changed */
7323                         goto dont_do_it;
7324                 }
7325                 chk->data = sp->data;
7326                 chk->last_mbuf = sp->tail_mbuf;
7327                 /* register the stealing */
7328                 sp->data = sp->tail_mbuf = NULL;
7329         } else {
7330                 struct mbuf *m;
7331
7332 dont_do_it:
7333                 chk->data = SCTP_M_COPYM(sp->data, 0, to_move, M_NOWAIT);
7334                 chk->last_mbuf = NULL;
7335                 if (chk->data == NULL) {
7336                         sp->some_taken = some_taken;
7337                         sctp_free_a_chunk(stcb, chk, so_locked);
7338                         *bail = 1;
7339                         to_move = 0;
7340                         goto out_of;
7341                 }
7342 #ifdef SCTP_MBUF_LOGGING
7343                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
7344                         sctp_log_mbc(chk->data, SCTP_MBUF_ICOPY);
7345                 }
7346 #endif
7347                 /* Pull off the data */
7348                 m_adj(sp->data, to_move);
7349                 /* Now lets work our way down and compact it */
7350                 m = sp->data;
7351                 while (m && (SCTP_BUF_LEN(m) == 0)) {
7352                         sp->data = SCTP_BUF_NEXT(m);
7353                         SCTP_BUF_NEXT(m) = NULL;
7354                         if (sp->tail_mbuf == m) {
7355                                 /*-
7356                                  * Freeing tail? TSNH since
7357                                  * we supposedly were taking less
7358                                  * than the sp->length.
7359                                  */
7360 #ifdef INVARIANTS
7361                                 panic("Huh, freeing tail? - TSNH");
7362 #else
7363                                 SCTP_PRINTF("Huh, freeing tail? - TSNH\n");
7364                                 sp->tail_mbuf = sp->data = NULL;
7365                                 sp->length = 0;
7366 #endif
7367                         }
7368                         sctp_m_free(m);
7369                         m = sp->data;
7370                 }
7371         }
7372         if (SCTP_BUF_IS_EXTENDED(chk->data)) {
7373                 chk->copy_by_ref = 1;
7374         } else {
7375                 chk->copy_by_ref = 0;
7376         }
7377         /*
7378          * get last_mbuf and counts of mb usage This is ugly but hopefully
7379          * its only one mbuf.
7380          */
7381         if (chk->last_mbuf == NULL) {
7382                 chk->last_mbuf = chk->data;
7383                 while (SCTP_BUF_NEXT(chk->last_mbuf) != NULL) {
7384                         chk->last_mbuf = SCTP_BUF_NEXT(chk->last_mbuf);
7385                 }
7386         }
7387
7388         if (to_move > length) {
7389                 /*- This should not happen either
7390                  * since we always lower to_move to the size
7391                  * of sp->length if its larger.
7392                  */
7393 #ifdef INVARIANTS
7394                 panic("Huh, how can to_move be larger?");
7395 #else
7396                 SCTP_PRINTF("Huh, how can to_move be larger?\n");
7397                 sp->length = 0;
7398 #endif
7399         } else {
7400                 atomic_subtract_int(&sp->length, to_move);
7401         }
7402         leading = SCTP_DATA_CHUNK_OVERHEAD(stcb);
7403         if (M_LEADINGSPACE(chk->data) < leading) {
7404                 /* Not enough room for a chunk header, get some */
7405                 struct mbuf *m;
7406
7407                 m = sctp_get_mbuf_for_msg(1, 0, M_NOWAIT, 1, MT_DATA);
7408                 if (m == NULL) {
7409                         /*
7410                          * we're in trouble here. _PREPEND below will free
7411                          * all the data if there is no leading space, so we
7412                          * must put the data back and restore.
7413                          */
7414                         if (sp->data == NULL) {
7415                                 /* unsteal the data */
7416                                 sp->data = chk->data;
7417                                 sp->tail_mbuf = chk->last_mbuf;
7418                         } else {
7419                                 struct mbuf *m_tmp;
7420
7421                                 /* reassemble the data */
7422                                 m_tmp = sp->data;
7423                                 sp->data = chk->data;
7424                                 SCTP_BUF_NEXT(chk->last_mbuf) = m_tmp;
7425                         }
7426                         sp->some_taken = some_taken;
7427                         atomic_add_int(&sp->length, to_move);
7428                         chk->data = NULL;
7429                         *bail = 1;
7430                         sctp_free_a_chunk(stcb, chk, so_locked);
7431                         to_move = 0;
7432                         goto out_of;
7433                 } else {
7434                         SCTP_BUF_LEN(m) = 0;
7435                         SCTP_BUF_NEXT(m) = chk->data;
7436                         chk->data = m;
7437                         M_ALIGN(chk->data, 4);
7438                 }
7439         }
7440         SCTP_BUF_PREPEND(chk->data, SCTP_DATA_CHUNK_OVERHEAD(stcb), M_NOWAIT);
7441         if (chk->data == NULL) {
7442                 /* HELP, TSNH since we assured it would not above? */
7443 #ifdef INVARIANTS
7444                 panic("prepend fails HELP?");
7445 #else
7446                 SCTP_PRINTF("prepend fails HELP?\n");
7447                 sctp_free_a_chunk(stcb, chk, so_locked);
7448 #endif
7449                 *bail = 1;
7450                 to_move = 0;
7451                 goto out_of;
7452         }
7453         sctp_snd_sb_alloc(stcb, SCTP_DATA_CHUNK_OVERHEAD(stcb));
7454         chk->book_size = chk->send_size = (uint16_t)(to_move + SCTP_DATA_CHUNK_OVERHEAD(stcb));
7455         chk->book_size_scale = 0;
7456         chk->sent = SCTP_DATAGRAM_UNSENT;
7457
7458         chk->flags = 0;
7459         chk->asoc = &stcb->asoc;
7460         chk->pad_inplace = 0;
7461         chk->no_fr_allowed = 0;
7462         if (stcb->asoc.idata_supported == 0) {
7463                 if (rcv_flags & SCTP_DATA_UNORDERED) {
7464                         /* Just use 0. The receiver ignores the values. */
7465                         chk->rec.data.mid = 0;
7466                 } else {
7467                         chk->rec.data.mid = strq->next_mid_ordered;
7468                         if (rcv_flags & SCTP_DATA_LAST_FRAG) {
7469                                 strq->next_mid_ordered++;
7470                         }
7471                 }
7472         } else {
7473                 if (rcv_flags & SCTP_DATA_UNORDERED) {
7474                         chk->rec.data.mid = strq->next_mid_unordered;
7475                         if (rcv_flags & SCTP_DATA_LAST_FRAG) {
7476                                 strq->next_mid_unordered++;
7477                         }
7478                 } else {
7479                         chk->rec.data.mid = strq->next_mid_ordered;
7480                         if (rcv_flags & SCTP_DATA_LAST_FRAG) {
7481                                 strq->next_mid_ordered++;
7482                         }
7483                 }
7484         }
7485         chk->rec.data.sid = sp->sid;
7486         chk->rec.data.ppid = sp->ppid;
7487         chk->rec.data.context = sp->context;
7488         chk->rec.data.doing_fast_retransmit = 0;
7489
7490         chk->rec.data.timetodrop = sp->ts;
7491         chk->flags = sp->act_flags;
7492
7493         if (sp->net) {
7494                 chk->whoTo = sp->net;
7495                 atomic_add_int(&chk->whoTo->ref_count, 1);
7496         } else
7497                 chk->whoTo = NULL;
7498
7499         if (sp->holds_key_ref) {
7500                 chk->auth_keyid = sp->auth_keyid;
7501                 sctp_auth_key_acquire(stcb, chk->auth_keyid);
7502                 chk->holds_key_ref = 1;
7503         }
7504         stcb->asoc.ss_functions.sctp_ss_scheduled(stcb, net, asoc, strq, to_move);
7505         chk->rec.data.tsn = atomic_fetchadd_int(&asoc->sending_seq, 1);
7506         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_AT_SEND_2_OUTQ) {
7507                 sctp_misc_ints(SCTP_STRMOUT_LOG_SEND,
7508                     (uint32_t)(uintptr_t)stcb, sp->length,
7509                     (uint32_t)((chk->rec.data.sid << 16) | (0x0000ffff & chk->rec.data.mid)),
7510                     chk->rec.data.tsn);
7511         }
7512         if (stcb->asoc.idata_supported == 0) {
7513                 dchkh = mtod(chk->data, struct sctp_data_chunk *);
7514         } else {
7515                 ndchkh = mtod(chk->data, struct sctp_idata_chunk *);
7516         }
7517         /*
7518          * Put the rest of the things in place now. Size was done earlier in
7519          * previous loop prior to padding.
7520          */
7521
7522         SCTP_TCB_LOCK_ASSERT(stcb);
7523 #ifdef SCTP_ASOCLOG_OF_TSNS
7524         if (asoc->tsn_out_at >= SCTP_TSN_LOG_SIZE) {
7525                 asoc->tsn_out_at = 0;
7526                 asoc->tsn_out_wrapped = 1;
7527         }
7528         asoc->out_tsnlog[asoc->tsn_out_at].tsn = chk->rec.data.tsn;
7529         asoc->out_tsnlog[asoc->tsn_out_at].strm = chk->rec.data.sid;
7530         asoc->out_tsnlog[asoc->tsn_out_at].seq = chk->rec.data.mid;
7531         asoc->out_tsnlog[asoc->tsn_out_at].sz = chk->send_size;
7532         asoc->out_tsnlog[asoc->tsn_out_at].flgs = chk->rec.data.rcv_flags;
7533         asoc->out_tsnlog[asoc->tsn_out_at].stcb = (void *)stcb;
7534         asoc->out_tsnlog[asoc->tsn_out_at].in_pos = asoc->tsn_out_at;
7535         asoc->out_tsnlog[asoc->tsn_out_at].in_out = 2;
7536         asoc->tsn_out_at++;
7537 #endif
7538         if (stcb->asoc.idata_supported == 0) {
7539                 dchkh->ch.chunk_type = SCTP_DATA;
7540                 dchkh->ch.chunk_flags = chk->rec.data.rcv_flags;
7541                 dchkh->dp.tsn = htonl(chk->rec.data.tsn);
7542                 dchkh->dp.sid = htons(strq->sid);
7543                 dchkh->dp.ssn = htons((uint16_t)chk->rec.data.mid);
7544                 dchkh->dp.ppid = chk->rec.data.ppid;
7545                 dchkh->ch.chunk_length = htons(chk->send_size);
7546         } else {
7547                 ndchkh->ch.chunk_type = SCTP_IDATA;
7548                 ndchkh->ch.chunk_flags = chk->rec.data.rcv_flags;
7549                 ndchkh->dp.tsn = htonl(chk->rec.data.tsn);
7550                 ndchkh->dp.sid = htons(strq->sid);
7551                 ndchkh->dp.reserved = htons(0);
7552                 ndchkh->dp.mid = htonl(chk->rec.data.mid);
7553                 if (sp->fsn == 0)
7554                         ndchkh->dp.ppid_fsn.ppid = chk->rec.data.ppid;
7555                 else
7556                         ndchkh->dp.ppid_fsn.fsn = htonl(sp->fsn);
7557                 sp->fsn++;
7558                 ndchkh->ch.chunk_length = htons(chk->send_size);
7559         }
7560         /* Now advance the chk->send_size by the actual pad needed. */
7561         if (chk->send_size < SCTP_SIZE32(chk->book_size)) {
7562                 /* need a pad */
7563                 struct mbuf *lm;
7564                 int pads;
7565
7566                 pads = SCTP_SIZE32(chk->book_size) - chk->send_size;
7567                 lm = sctp_pad_lastmbuf(chk->data, pads, chk->last_mbuf);
7568                 if (lm != NULL) {
7569                         chk->last_mbuf = lm;
7570                         chk->pad_inplace = 1;
7571                 }
7572                 chk->send_size += pads;
7573         }
7574         if (PR_SCTP_ENABLED(chk->flags)) {
7575                 asoc->pr_sctp_cnt++;
7576         }
7577         if (sp->msg_is_complete && (sp->length == 0) && (sp->sender_all_done)) {
7578                 /* All done pull and kill the message */
7579                 if (sp->put_last_out == 0) {
7580                         SCTP_PRINTF("Gak, put out entire msg with NO end!-2\n");
7581                         SCTP_PRINTF("sender_done:%d len:%d msg_comp:%d put_last_out:%d\n",
7582                             sp->sender_all_done,
7583                             sp->length,
7584                             sp->msg_is_complete,
7585                             sp->put_last_out);
7586                 }
7587                 atomic_subtract_int(&asoc->stream_queue_cnt, 1);
7588                 TAILQ_REMOVE(&strq->outqueue, sp, next);
7589                 stcb->asoc.ss_functions.sctp_ss_remove_from_stream(stcb, asoc, strq, sp);
7590                 if ((strq->state == SCTP_STREAM_RESET_PENDING) &&
7591                     (strq->chunks_on_queues == 0) &&
7592                     TAILQ_EMPTY(&strq->outqueue)) {
7593                         stcb->asoc.trigger_reset = 1;
7594                 }
7595                 if (sp->net) {
7596                         sctp_free_remote_addr(sp->net);
7597                         sp->net = NULL;
7598                 }
7599                 if (sp->data) {
7600                         sctp_m_freem(sp->data);
7601                         sp->data = NULL;
7602                 }
7603                 sctp_free_a_strmoq(stcb, sp, so_locked);
7604         }
7605         asoc->chunks_on_out_queue++;
7606         strq->chunks_on_queues++;
7607         TAILQ_INSERT_TAIL(&asoc->send_queue, chk, sctp_next);
7608         asoc->send_queue_cnt++;
7609 out_of:
7610         return (to_move);
7611 }
7612
7613 static void
7614 sctp_fill_outqueue(struct sctp_tcb *stcb, struct sctp_nets *net,
7615     uint32_t frag_point, int eeor_mode, int *quit_now,
7616     int so_locked)
7617 {
7618         struct sctp_association *asoc;
7619         struct sctp_stream_out *strq;
7620         uint32_t space_left, moved, total_moved;
7621         int bail, giveup;
7622
7623         SCTP_TCB_LOCK_ASSERT(stcb);
7624         asoc = &stcb->asoc;
7625         total_moved = 0;
7626         switch (net->ro._l_addr.sa.sa_family) {
7627 #ifdef INET
7628         case AF_INET:
7629                 space_left = net->mtu - SCTP_MIN_V4_OVERHEAD;
7630                 break;
7631 #endif
7632 #ifdef INET6
7633         case AF_INET6:
7634                 space_left = net->mtu - SCTP_MIN_OVERHEAD;
7635                 break;
7636 #endif
7637         default:
7638                 /* TSNH */
7639                 space_left = net->mtu;
7640                 break;
7641         }
7642         /* Need an allowance for the data chunk header too */
7643         space_left -= SCTP_DATA_CHUNK_OVERHEAD(stcb);
7644
7645         /* must make even word boundary */
7646         space_left &= 0xfffffffc;
7647         strq = stcb->asoc.ss_functions.sctp_ss_select_stream(stcb, net, asoc);
7648         giveup = 0;
7649         bail = 0;
7650         while ((space_left > 0) && (strq != NULL)) {
7651                 moved = sctp_move_to_outqueue(stcb, net, strq, space_left,
7652                     frag_point, &giveup, eeor_mode,
7653                     &bail, so_locked);
7654                 if ((giveup != 0) || (bail != 0)) {
7655                         break;
7656                 }
7657                 strq = stcb->asoc.ss_functions.sctp_ss_select_stream(stcb, net, asoc);
7658                 total_moved += moved;
7659                 if (space_left >= moved) {
7660                         space_left -= moved;
7661                 } else {
7662                         space_left = 0;
7663                 }
7664                 if (space_left >= SCTP_DATA_CHUNK_OVERHEAD(stcb)) {
7665                         space_left -= SCTP_DATA_CHUNK_OVERHEAD(stcb);
7666                 } else {
7667                         space_left = 0;
7668                 }
7669                 space_left &= 0xfffffffc;
7670         }
7671         if (bail != 0)
7672                 *quit_now = 1;
7673
7674         stcb->asoc.ss_functions.sctp_ss_packet_done(stcb, net, asoc);
7675
7676         if (total_moved == 0) {
7677                 if ((stcb->asoc.sctp_cmt_on_off == 0) &&
7678                     (net == stcb->asoc.primary_destination)) {
7679                         /* ran dry for primary network net */
7680                         SCTP_STAT_INCR(sctps_primary_randry);
7681                 } else if (stcb->asoc.sctp_cmt_on_off > 0) {
7682                         /* ran dry with CMT on */
7683                         SCTP_STAT_INCR(sctps_cmt_randry);
7684                 }
7685         }
7686 }
7687
7688 void
7689 sctp_fix_ecn_echo(struct sctp_association *asoc)
7690 {
7691         struct sctp_tmit_chunk *chk;
7692
7693         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
7694                 if (chk->rec.chunk_id.id == SCTP_ECN_ECHO) {
7695                         chk->sent = SCTP_DATAGRAM_UNSENT;
7696                 }
7697         }
7698 }
7699
7700 void
7701 sctp_move_chunks_from_net(struct sctp_tcb *stcb, struct sctp_nets *net)
7702 {
7703         struct sctp_association *asoc;
7704         struct sctp_tmit_chunk *chk;
7705         struct sctp_stream_queue_pending *sp;
7706         unsigned int i;
7707
7708         if (net == NULL) {
7709                 return;
7710         }
7711         asoc = &stcb->asoc;
7712         for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
7713                 TAILQ_FOREACH(sp, &stcb->asoc.strmout[i].outqueue, next) {
7714                         if (sp->net == net) {
7715                                 sctp_free_remote_addr(sp->net);
7716                                 sp->net = NULL;
7717                         }
7718                 }
7719         }
7720         TAILQ_FOREACH(chk, &asoc->send_queue, sctp_next) {
7721                 if (chk->whoTo == net) {
7722                         sctp_free_remote_addr(chk->whoTo);
7723                         chk->whoTo = NULL;
7724                 }
7725         }
7726 }
7727
7728 int
7729 sctp_med_chunk_output(struct sctp_inpcb *inp,
7730     struct sctp_tcb *stcb,
7731     struct sctp_association *asoc,
7732     int *num_out,
7733     int *reason_code,
7734     int control_only, int from_where,
7735     struct timeval *now, int *now_filled,
7736     uint32_t frag_point, int so_locked)
7737 {
7738         /**
7739          * Ok this is the generic chunk service queue. we must do the
7740          * following:
7741          * - Service the stream queue that is next, moving any
7742          *   message (note I must get a complete message i.e. FIRST/MIDDLE and
7743          *   LAST to the out queue in one pass) and assigning TSN's. This
7744          *   only applies though if the peer does not support NDATA. For NDATA
7745          *   chunks its ok to not send the entire message ;-)
7746          * - Check to see if the cwnd/rwnd allows any output, if so we go ahead and
7747          *   formulate and send the low level chunks. Making sure to combine
7748          *   any control in the control chunk queue also.
7749          */
7750         struct sctp_nets *net, *start_at, *sack_goes_to = NULL, *old_start_at = NULL;
7751         struct mbuf *outchain, *endoutchain;
7752         struct sctp_tmit_chunk *chk, *nchk;
7753
7754         /* temp arrays for unlinking */
7755         struct sctp_tmit_chunk *data_list[SCTP_MAX_DATA_BUNDLING];
7756         int no_fragmentflg, error;
7757         unsigned int max_rwnd_per_dest, max_send_per_dest;
7758         int one_chunk, hbflag, skip_data_for_this_net;
7759         int asconf, cookie, no_out_cnt;
7760         int bundle_at, ctl_cnt, no_data_chunks, eeor_mode;
7761         unsigned int mtu, r_mtu, omtu, mx_mtu, to_out;
7762         int tsns_sent = 0;
7763         uint32_t auth_offset;
7764         struct sctp_auth_chunk *auth;
7765         uint16_t auth_keyid;
7766         int override_ok = 1;
7767         int skip_fill_up = 0;
7768         int data_auth_reqd = 0;
7769
7770         /*
7771          * JRS 5/14/07 - Add flag for whether a heartbeat is sent to the
7772          * destination.
7773          */
7774         int quit_now = 0;
7775
7776         *num_out = 0;
7777         *reason_code = 0;
7778         auth_keyid = stcb->asoc.authinfo.active_keyid;
7779         if ((asoc->state & SCTP_STATE_SHUTDOWN_PENDING) ||
7780             (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_RECEIVED) ||
7781             (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_EXPLICIT_EOR))) {
7782                 eeor_mode = 1;
7783         } else {
7784                 eeor_mode = 0;
7785         }
7786         ctl_cnt = no_out_cnt = asconf = cookie = 0;
7787         /*
7788          * First lets prime the pump. For each destination, if there is room
7789          * in the flight size, attempt to pull an MTU's worth out of the
7790          * stream queues into the general send_queue
7791          */
7792 #ifdef SCTP_AUDITING_ENABLED
7793         sctp_audit_log(0xC2, 2);
7794 #endif
7795         SCTP_TCB_LOCK_ASSERT(stcb);
7796         hbflag = 0;
7797         if (control_only)
7798                 no_data_chunks = 1;
7799         else
7800                 no_data_chunks = 0;
7801
7802         /* Nothing to possible to send? */
7803         if ((TAILQ_EMPTY(&asoc->control_send_queue) ||
7804             (asoc->ctrl_queue_cnt == stcb->asoc.ecn_echo_cnt_onq)) &&
7805             TAILQ_EMPTY(&asoc->asconf_send_queue) &&
7806             TAILQ_EMPTY(&asoc->send_queue) &&
7807             sctp_is_there_unsent_data(stcb, so_locked) == 0) {
7808 nothing_to_send:
7809                 *reason_code = 9;
7810                 return (0);
7811         }
7812         if (asoc->peers_rwnd == 0) {
7813                 /* No room in peers rwnd */
7814                 *reason_code = 1;
7815                 if (asoc->total_flight > 0) {
7816                         /* we are allowed one chunk in flight */
7817                         no_data_chunks = 1;
7818                 }
7819         }
7820         if (stcb->asoc.ecn_echo_cnt_onq) {
7821                 /* Record where a sack goes, if any */
7822                 if (no_data_chunks &&
7823                     (asoc->ctrl_queue_cnt == stcb->asoc.ecn_echo_cnt_onq)) {
7824                         /* Nothing but ECNe to send - we don't do that */
7825                         goto nothing_to_send;
7826                 }
7827                 TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
7828                         if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
7829                             (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK)) {
7830                                 sack_goes_to = chk->whoTo;
7831                                 break;
7832                         }
7833                 }
7834         }
7835         max_rwnd_per_dest = ((asoc->peers_rwnd + asoc->total_flight) / asoc->numnets);
7836         if (stcb->sctp_socket)
7837                 max_send_per_dest = SCTP_SB_LIMIT_SND(stcb->sctp_socket) / asoc->numnets;
7838         else
7839                 max_send_per_dest = 0;
7840         if (no_data_chunks == 0) {
7841                 /* How many non-directed chunks are there? */
7842                 TAILQ_FOREACH(chk, &asoc->send_queue, sctp_next) {
7843                         if (chk->whoTo == NULL) {
7844                                 /*
7845                                  * We already have non-directed chunks on
7846                                  * the queue, no need to do a fill-up.
7847                                  */
7848                                 skip_fill_up = 1;
7849                                 break;
7850                         }
7851                 }
7852         }
7853         if ((no_data_chunks == 0) &&
7854             (skip_fill_up == 0) &&
7855             (!stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc))) {
7856                 TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
7857                         /*
7858                          * This for loop we are in takes in each net, if
7859                          * its's got space in cwnd and has data sent to it
7860                          * (when CMT is off) then it calls
7861                          * sctp_fill_outqueue for the net. This gets data on
7862                          * the send queue for that network.
7863                          *
7864                          * In sctp_fill_outqueue TSN's are assigned and data
7865                          * is copied out of the stream buffers. Note mostly
7866                          * copy by reference (we hope).
7867                          */
7868                         net->window_probe = 0;
7869                         if ((net != stcb->asoc.alternate) &&
7870                             ((net->dest_state & SCTP_ADDR_PF) ||
7871                             ((net->dest_state & SCTP_ADDR_REACHABLE) == 0) ||
7872                             (net->dest_state & SCTP_ADDR_UNCONFIRMED))) {
7873                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
7874                                         sctp_log_cwnd(stcb, net, 1,
7875                                             SCTP_CWND_LOG_FILL_OUTQ_CALLED);
7876                                 }
7877                                 continue;
7878                         }
7879                         if ((stcb->asoc.cc_functions.sctp_cwnd_new_transmission_begins) &&
7880                             (net->flight_size == 0)) {
7881                                 (*stcb->asoc.cc_functions.sctp_cwnd_new_transmission_begins) (stcb, net);
7882                         }
7883                         if (net->flight_size >= net->cwnd) {
7884                                 /* skip this network, no room - can't fill */
7885                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
7886                                         sctp_log_cwnd(stcb, net, 3,
7887                                             SCTP_CWND_LOG_FILL_OUTQ_CALLED);
7888                                 }
7889                                 continue;
7890                         }
7891                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
7892                                 sctp_log_cwnd(stcb, net, 4, SCTP_CWND_LOG_FILL_OUTQ_CALLED);
7893                         }
7894                         sctp_fill_outqueue(stcb, net, frag_point, eeor_mode, &quit_now, so_locked);
7895                         if (quit_now) {
7896                                 /* memory alloc failure */
7897                                 no_data_chunks = 1;
7898                                 break;
7899                         }
7900                 }
7901         }
7902         /* now service each destination and send out what we can for it */
7903         /* Nothing to send? */
7904         if (TAILQ_EMPTY(&asoc->control_send_queue) &&
7905             TAILQ_EMPTY(&asoc->asconf_send_queue) &&
7906             TAILQ_EMPTY(&asoc->send_queue)) {
7907                 *reason_code = 8;
7908                 return (0);
7909         }
7910
7911         if (asoc->sctp_cmt_on_off > 0) {
7912                 /* get the last start point */
7913                 start_at = asoc->last_net_cmt_send_started;
7914                 if (start_at == NULL) {
7915                         /* null so to beginning */
7916                         start_at = TAILQ_FIRST(&asoc->nets);
7917                 } else {
7918                         start_at = TAILQ_NEXT(asoc->last_net_cmt_send_started, sctp_next);
7919                         if (start_at == NULL) {
7920                                 start_at = TAILQ_FIRST(&asoc->nets);
7921                         }
7922                 }
7923                 asoc->last_net_cmt_send_started = start_at;
7924         } else {
7925                 start_at = TAILQ_FIRST(&asoc->nets);
7926         }
7927         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
7928                 if (chk->whoTo == NULL) {
7929                         if (asoc->alternate) {
7930                                 chk->whoTo = asoc->alternate;
7931                         } else {
7932                                 chk->whoTo = asoc->primary_destination;
7933                         }
7934                         atomic_add_int(&chk->whoTo->ref_count, 1);
7935                 }
7936         }
7937         old_start_at = NULL;
7938 again_one_more_time:
7939         for (net = start_at; net != NULL; net = TAILQ_NEXT(net, sctp_next)) {
7940                 /* how much can we send? */
7941                 /* SCTPDBG("Examine for sending net:%x\n", (uint32_t)net); */
7942                 if (old_start_at && (old_start_at == net)) {
7943                         /* through list completely. */
7944                         break;
7945                 }
7946                 tsns_sent = 0xa;
7947                 if (TAILQ_EMPTY(&asoc->control_send_queue) &&
7948                     TAILQ_EMPTY(&asoc->asconf_send_queue) &&
7949                     (net->flight_size >= net->cwnd)) {
7950                         /*
7951                          * Nothing on control or asconf and flight is full,
7952                          * we can skip even in the CMT case.
7953                          */
7954                         continue;
7955                 }
7956                 bundle_at = 0;
7957                 endoutchain = outchain = NULL;
7958                 auth = NULL;
7959                 auth_offset = 0;
7960                 no_fragmentflg = 1;
7961                 one_chunk = 0;
7962                 if (net->dest_state & SCTP_ADDR_UNCONFIRMED) {
7963                         skip_data_for_this_net = 1;
7964                 } else {
7965                         skip_data_for_this_net = 0;
7966                 }
7967                 switch (((struct sockaddr *)&net->ro._l_addr)->sa_family) {
7968 #ifdef INET
7969                 case AF_INET:
7970                         mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
7971                         break;
7972 #endif
7973 #ifdef INET6
7974                 case AF_INET6:
7975                         mtu = net->mtu - SCTP_MIN_OVERHEAD;
7976                         break;
7977 #endif
7978                 default:
7979                         /* TSNH */
7980                         mtu = net->mtu;
7981                         break;
7982                 }
7983                 mx_mtu = mtu;
7984                 to_out = 0;
7985                 if (mtu > asoc->peers_rwnd) {
7986                         if (asoc->total_flight > 0) {
7987                                 /* We have a packet in flight somewhere */
7988                                 r_mtu = asoc->peers_rwnd;
7989                         } else {
7990                                 /* We are always allowed to send one MTU out */
7991                                 one_chunk = 1;
7992                                 r_mtu = mtu;
7993                         }
7994                 } else {
7995                         r_mtu = mtu;
7996                 }
7997                 error = 0;
7998                 /************************/
7999                 /* ASCONF transmission */
8000                 /************************/
8001                 /* Now first lets go through the asconf queue */
8002                 TAILQ_FOREACH_SAFE(chk, &asoc->asconf_send_queue, sctp_next, nchk) {
8003                         if (chk->rec.chunk_id.id != SCTP_ASCONF) {
8004                                 continue;
8005                         }
8006                         if (chk->whoTo == NULL) {
8007                                 if (asoc->alternate == NULL) {
8008                                         if (asoc->primary_destination != net) {
8009                                                 break;
8010                                         }
8011                                 } else {
8012                                         if (asoc->alternate != net) {
8013                                                 break;
8014                                         }
8015                                 }
8016                         } else {
8017                                 if (chk->whoTo != net) {
8018                                         break;
8019                                 }
8020                         }
8021                         if (chk->data == NULL) {
8022                                 break;
8023                         }
8024                         if (chk->sent != SCTP_DATAGRAM_UNSENT &&
8025                             chk->sent != SCTP_DATAGRAM_RESEND) {
8026                                 break;
8027                         }
8028                         /*
8029                          * if no AUTH is yet included and this chunk
8030                          * requires it, make sure to account for it.  We
8031                          * don't apply the size until the AUTH chunk is
8032                          * actually added below in case there is no room for
8033                          * this chunk. NOTE: we overload the use of "omtu"
8034                          * here
8035                          */
8036                         if ((auth == NULL) &&
8037                             sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
8038                             stcb->asoc.peer_auth_chunks)) {
8039                                 omtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
8040                         } else
8041                                 omtu = 0;
8042                         /* Here we do NOT factor the r_mtu */
8043                         if ((chk->send_size < (int)(mtu - omtu)) ||
8044                             (chk->flags & CHUNK_FLAGS_FRAGMENT_OK)) {
8045                                 /*
8046                                  * We probably should glom the mbuf chain
8047                                  * from the chk->data for control but the
8048                                  * problem is it becomes yet one more level
8049                                  * of tracking to do if for some reason
8050                                  * output fails. Then I have got to
8051                                  * reconstruct the merged control chain.. el
8052                                  * yucko.. for now we take the easy way and
8053                                  * do the copy
8054                                  */
8055                                 /*
8056                                  * Add an AUTH chunk, if chunk requires it
8057                                  * save the offset into the chain for AUTH
8058                                  */
8059                                 if ((auth == NULL) &&
8060                                     (sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
8061                                     stcb->asoc.peer_auth_chunks))) {
8062                                         outchain = sctp_add_auth_chunk(outchain,
8063                                             &endoutchain,
8064                                             &auth,
8065                                             &auth_offset,
8066                                             stcb,
8067                                             chk->rec.chunk_id.id);
8068                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8069                                 }
8070                                 outchain = sctp_copy_mbufchain(chk->data, outchain, &endoutchain,
8071                                     (int)chk->rec.chunk_id.can_take_data,
8072                                     chk->send_size, chk->copy_by_ref);
8073                                 if (outchain == NULL) {
8074                                         *reason_code = 8;
8075                                         SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
8076                                         return (ENOMEM);
8077                                 }
8078                                 SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8079                                 /* update our MTU size */
8080                                 if (mtu > (chk->send_size + omtu))
8081                                         mtu -= (chk->send_size + omtu);
8082                                 else
8083                                         mtu = 0;
8084                                 to_out += (chk->send_size + omtu);
8085                                 /* Do clear IP_DF ? */
8086                                 if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
8087                                         no_fragmentflg = 0;
8088                                 }
8089                                 if (chk->rec.chunk_id.can_take_data)
8090                                         chk->data = NULL;
8091                                 /*
8092                                  * set hb flag since we can use these for
8093                                  * RTO
8094                                  */
8095                                 hbflag = 1;
8096                                 asconf = 1;
8097                                 /*
8098                                  * should sysctl this: don't bundle data
8099                                  * with ASCONF since it requires AUTH
8100                                  */
8101                                 no_data_chunks = 1;
8102                                 chk->sent = SCTP_DATAGRAM_SENT;
8103                                 if (chk->whoTo == NULL) {
8104                                         chk->whoTo = net;
8105                                         atomic_add_int(&net->ref_count, 1);
8106                                 }
8107                                 chk->snd_count++;
8108                                 if (mtu == 0) {
8109                                         /*
8110                                          * Ok we are out of room but we can
8111                                          * output without effecting the
8112                                          * flight size since this little guy
8113                                          * is a control only packet.
8114                                          */
8115                                         sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp, stcb, net);
8116                                         /*
8117                                          * do NOT clear the asconf flag as
8118                                          * it is used to do appropriate
8119                                          * source address selection.
8120                                          */
8121                                         if (*now_filled == 0) {
8122                                                 (void)SCTP_GETTIME_TIMEVAL(now);
8123                                                 *now_filled = 1;
8124                                         }
8125                                         net->last_sent_time = *now;
8126                                         hbflag = 0;
8127                                         if ((error = sctp_lowlevel_chunk_output(inp, stcb, net,
8128                                             (struct sockaddr *)&net->ro._l_addr,
8129                                             outchain, auth_offset, auth,
8130                                             stcb->asoc.authinfo.active_keyid,
8131                                             no_fragmentflg, 0, asconf,
8132                                             inp->sctp_lport, stcb->rport,
8133                                             htonl(stcb->asoc.peer_vtag),
8134                                             net->port, NULL,
8135                                             0, 0,
8136                                             so_locked))) {
8137                                                 /*
8138                                                  * error, we could not
8139                                                  * output
8140                                                  */
8141                                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
8142                                                 if (from_where == 0) {
8143                                                         SCTP_STAT_INCR(sctps_lowlevelerrusr);
8144                                                 }
8145                                                 if (error == ENOBUFS) {
8146                                                         asoc->ifp_had_enobuf = 1;
8147                                                         SCTP_STAT_INCR(sctps_lowlevelerr);
8148                                                 }
8149                                                 /* error, could not output */
8150                                                 if (error == EHOSTUNREACH) {
8151                                                         /*
8152                                                          * Destination went
8153                                                          * unreachable
8154                                                          * during this send
8155                                                          */
8156                                                         sctp_move_chunks_from_net(stcb, net);
8157                                                 }
8158                                                 *reason_code = 7;
8159                                                 break;
8160                                         } else {
8161                                                 asoc->ifp_had_enobuf = 0;
8162                                         }
8163                                         /*
8164                                          * increase the number we sent, if a
8165                                          * cookie is sent we don't tell them
8166                                          * any was sent out.
8167                                          */
8168                                         outchain = endoutchain = NULL;
8169                                         auth = NULL;
8170                                         auth_offset = 0;
8171                                         if (!no_out_cnt)
8172                                                 *num_out += ctl_cnt;
8173                                         /* recalc a clean slate and setup */
8174                                         switch (net->ro._l_addr.sa.sa_family) {
8175 #ifdef INET
8176                                         case AF_INET:
8177                                                 mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
8178                                                 break;
8179 #endif
8180 #ifdef INET6
8181                                         case AF_INET6:
8182                                                 mtu = net->mtu - SCTP_MIN_OVERHEAD;
8183                                                 break;
8184 #endif
8185                                         default:
8186                                                 /* TSNH */
8187                                                 mtu = net->mtu;
8188                                                 break;
8189                                         }
8190                                         to_out = 0;
8191                                         no_fragmentflg = 1;
8192                                 }
8193                         }
8194                 }
8195                 if (error != 0) {
8196                         /* try next net */
8197                         continue;
8198                 }
8199                 /************************/
8200                 /* Control transmission */
8201                 /************************/
8202                 /* Now first lets go through the control queue */
8203                 TAILQ_FOREACH_SAFE(chk, &asoc->control_send_queue, sctp_next, nchk) {
8204                         if ((sack_goes_to) &&
8205                             (chk->rec.chunk_id.id == SCTP_ECN_ECHO) &&
8206                             (chk->whoTo != sack_goes_to)) {
8207                                 /*
8208                                  * if we have a sack in queue, and we are
8209                                  * looking at an ecn echo that is NOT queued
8210                                  * to where the sack is going..
8211                                  */
8212                                 if (chk->whoTo == net) {
8213                                         /*
8214                                          * Don't transmit it to where its
8215                                          * going (current net)
8216                                          */
8217                                         continue;
8218                                 } else if (sack_goes_to == net) {
8219                                         /*
8220                                          * But do transmit it to this
8221                                          * address
8222                                          */
8223                                         goto skip_net_check;
8224                                 }
8225                         }
8226                         if (chk->whoTo == NULL) {
8227                                 if (asoc->alternate == NULL) {
8228                                         if (asoc->primary_destination != net) {
8229                                                 continue;
8230                                         }
8231                                 } else {
8232                                         if (asoc->alternate != net) {
8233                                                 continue;
8234                                         }
8235                                 }
8236                         } else {
8237                                 if (chk->whoTo != net) {
8238                                         continue;
8239                                 }
8240                         }
8241         skip_net_check:
8242                         if (chk->data == NULL) {
8243                                 continue;
8244                         }
8245                         if (chk->sent != SCTP_DATAGRAM_UNSENT) {
8246                                 /*
8247                                  * It must be unsent. Cookies and ASCONF's
8248                                  * hang around but there timers will force
8249                                  * when marked for resend.
8250                                  */
8251                                 continue;
8252                         }
8253                         /*
8254                          * if no AUTH is yet included and this chunk
8255                          * requires it, make sure to account for it.  We
8256                          * don't apply the size until the AUTH chunk is
8257                          * actually added below in case there is no room for
8258                          * this chunk. NOTE: we overload the use of "omtu"
8259                          * here
8260                          */
8261                         if ((auth == NULL) &&
8262                             sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
8263                             stcb->asoc.peer_auth_chunks)) {
8264                                 omtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
8265                         } else
8266                                 omtu = 0;
8267                         /* Here we do NOT factor the r_mtu */
8268                         if ((chk->send_size <= (int)(mtu - omtu)) ||
8269                             (chk->flags & CHUNK_FLAGS_FRAGMENT_OK)) {
8270                                 /*
8271                                  * We probably should glom the mbuf chain
8272                                  * from the chk->data for control but the
8273                                  * problem is it becomes yet one more level
8274                                  * of tracking to do if for some reason
8275                                  * output fails. Then I have got to
8276                                  * reconstruct the merged control chain.. el
8277                                  * yucko.. for now we take the easy way and
8278                                  * do the copy
8279                                  */
8280                                 /*
8281                                  * Add an AUTH chunk, if chunk requires it
8282                                  * save the offset into the chain for AUTH
8283                                  */
8284                                 if ((auth == NULL) &&
8285                                     (sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
8286                                     stcb->asoc.peer_auth_chunks))) {
8287                                         outchain = sctp_add_auth_chunk(outchain,
8288                                             &endoutchain,
8289                                             &auth,
8290                                             &auth_offset,
8291                                             stcb,
8292                                             chk->rec.chunk_id.id);
8293                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8294                                 }
8295                                 outchain = sctp_copy_mbufchain(chk->data, outchain, &endoutchain,
8296                                     (int)chk->rec.chunk_id.can_take_data,
8297                                     chk->send_size, chk->copy_by_ref);
8298                                 if (outchain == NULL) {
8299                                         *reason_code = 8;
8300                                         SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
8301                                         return (ENOMEM);
8302                                 }
8303                                 SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8304                                 /* update our MTU size */
8305                                 if (mtu > (chk->send_size + omtu))
8306                                         mtu -= (chk->send_size + omtu);
8307                                 else
8308                                         mtu = 0;
8309                                 to_out += (chk->send_size + omtu);
8310                                 /* Do clear IP_DF ? */
8311                                 if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
8312                                         no_fragmentflg = 0;
8313                                 }
8314                                 if (chk->rec.chunk_id.can_take_data)
8315                                         chk->data = NULL;
8316                                 /* Mark things to be removed, if needed */
8317                                 if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
8318                                     (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK) ||  /* EY */
8319                                     (chk->rec.chunk_id.id == SCTP_HEARTBEAT_REQUEST) ||
8320                                     (chk->rec.chunk_id.id == SCTP_HEARTBEAT_ACK) ||
8321                                     (chk->rec.chunk_id.id == SCTP_SHUTDOWN) ||
8322                                     (chk->rec.chunk_id.id == SCTP_SHUTDOWN_ACK) ||
8323                                     (chk->rec.chunk_id.id == SCTP_OPERATION_ERROR) ||
8324                                     (chk->rec.chunk_id.id == SCTP_COOKIE_ACK) ||
8325                                     (chk->rec.chunk_id.id == SCTP_ECN_CWR) ||
8326                                     (chk->rec.chunk_id.id == SCTP_PACKET_DROPPED) ||
8327                                     (chk->rec.chunk_id.id == SCTP_ASCONF_ACK)) {
8328                                         if (chk->rec.chunk_id.id == SCTP_HEARTBEAT_REQUEST) {
8329                                                 hbflag = 1;
8330                                         }
8331                                         /* remove these chunks at the end */
8332                                         if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
8333                                             (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK)) {
8334                                                 /* turn off the timer */
8335                                                 if (SCTP_OS_TIMER_PENDING(&stcb->asoc.dack_timer.timer)) {
8336                                                         sctp_timer_stop(SCTP_TIMER_TYPE_RECV,
8337                                                             inp, stcb, NULL,
8338                                                             SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_1);
8339                                                 }
8340                                         }
8341                                         ctl_cnt++;
8342                                 } else {
8343                                         /*
8344                                          * Other chunks, since they have
8345                                          * timers running (i.e. COOKIE) we
8346                                          * just "trust" that it gets sent or
8347                                          * retransmitted.
8348                                          */
8349                                         ctl_cnt++;
8350                                         if (chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
8351                                                 cookie = 1;
8352                                                 no_out_cnt = 1;
8353                                         } else if (chk->rec.chunk_id.id == SCTP_ECN_ECHO) {
8354                                                 /*
8355                                                  * Increment ecne send count
8356                                                  * here this means we may be
8357                                                  * over-zealous in our
8358                                                  * counting if the send
8359                                                  * fails, but its the best
8360                                                  * place to do it (we used
8361                                                  * to do it in the queue of
8362                                                  * the chunk, but that did
8363                                                  * not tell how many times
8364                                                  * it was sent.
8365                                                  */
8366                                                 SCTP_STAT_INCR(sctps_sendecne);
8367                                         }
8368                                         chk->sent = SCTP_DATAGRAM_SENT;
8369                                         if (chk->whoTo == NULL) {
8370                                                 chk->whoTo = net;
8371                                                 atomic_add_int(&net->ref_count, 1);
8372                                         }
8373                                         chk->snd_count++;
8374                                 }
8375                                 if (mtu == 0) {
8376                                         /*
8377                                          * Ok we are out of room but we can
8378                                          * output without effecting the
8379                                          * flight size since this little guy
8380                                          * is a control only packet.
8381                                          */
8382                                         if (asconf) {
8383                                                 sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp, stcb, net);
8384                                                 /*
8385                                                  * do NOT clear the asconf
8386                                                  * flag as it is used to do
8387                                                  * appropriate source
8388                                                  * address selection.
8389                                                  */
8390                                         }
8391                                         if (cookie) {
8392                                                 sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, inp, stcb, net);
8393                                                 cookie = 0;
8394                                         }
8395                                         /* Only HB or ASCONF advances time */
8396                                         if (hbflag) {
8397                                                 if (*now_filled == 0) {
8398                                                         (void)SCTP_GETTIME_TIMEVAL(now);
8399                                                         *now_filled = 1;
8400                                                 }
8401                                                 net->last_sent_time = *now;
8402                                                 hbflag = 0;
8403                                         }
8404                                         if ((error = sctp_lowlevel_chunk_output(inp, stcb, net,
8405                                             (struct sockaddr *)&net->ro._l_addr,
8406                                             outchain,
8407                                             auth_offset, auth,
8408                                             stcb->asoc.authinfo.active_keyid,
8409                                             no_fragmentflg, 0, asconf,
8410                                             inp->sctp_lport, stcb->rport,
8411                                             htonl(stcb->asoc.peer_vtag),
8412                                             net->port, NULL,
8413                                             0, 0,
8414                                             so_locked))) {
8415                                                 /*
8416                                                  * error, we could not
8417                                                  * output
8418                                                  */
8419                                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
8420                                                 if (from_where == 0) {
8421                                                         SCTP_STAT_INCR(sctps_lowlevelerrusr);
8422                                                 }
8423                                                 if (error == ENOBUFS) {
8424                                                         asoc->ifp_had_enobuf = 1;
8425                                                         SCTP_STAT_INCR(sctps_lowlevelerr);
8426                                                 }
8427                                                 if (error == EHOSTUNREACH) {
8428                                                         /*
8429                                                          * Destination went
8430                                                          * unreachable
8431                                                          * during this send
8432                                                          */
8433                                                         sctp_move_chunks_from_net(stcb, net);
8434                                                 }
8435                                                 *reason_code = 7;
8436                                                 break;
8437                                         } else {
8438                                                 asoc->ifp_had_enobuf = 0;
8439                                         }
8440                                         /*
8441                                          * increase the number we sent, if a
8442                                          * cookie is sent we don't tell them
8443                                          * any was sent out.
8444                                          */
8445                                         outchain = endoutchain = NULL;
8446                                         auth = NULL;
8447                                         auth_offset = 0;
8448                                         if (!no_out_cnt)
8449                                                 *num_out += ctl_cnt;
8450                                         /* recalc a clean slate and setup */
8451                                         switch (net->ro._l_addr.sa.sa_family) {
8452 #ifdef INET
8453                                         case AF_INET:
8454                                                 mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
8455                                                 break;
8456 #endif
8457 #ifdef INET6
8458                                         case AF_INET6:
8459                                                 mtu = net->mtu - SCTP_MIN_OVERHEAD;
8460                                                 break;
8461 #endif
8462                                         default:
8463                                                 /* TSNH */
8464                                                 mtu = net->mtu;
8465                                                 break;
8466                                         }
8467                                         to_out = 0;
8468                                         no_fragmentflg = 1;
8469                                 }
8470                         }
8471                 }
8472                 if (error != 0) {
8473                         /* try next net */
8474                         continue;
8475                 }
8476                 /* JRI: if dest is in PF state, do not send data to it */
8477                 if ((asoc->sctp_cmt_on_off > 0) &&
8478                     (net != stcb->asoc.alternate) &&
8479                     (net->dest_state & SCTP_ADDR_PF)) {
8480                         goto no_data_fill;
8481                 }
8482                 if (net->flight_size >= net->cwnd) {
8483                         goto no_data_fill;
8484                 }
8485                 if ((asoc->sctp_cmt_on_off > 0) &&
8486                     (SCTP_BASE_SYSCTL(sctp_buffer_splitting) & SCTP_RECV_BUFFER_SPLITTING) &&
8487                     (net->flight_size > max_rwnd_per_dest)) {
8488                         goto no_data_fill;
8489                 }
8490                 /*
8491                  * We need a specific accounting for the usage of the send
8492                  * buffer. We also need to check the number of messages per
8493                  * net. For now, this is better than nothing and it disabled
8494                  * by default...
8495                  */
8496                 if ((asoc->sctp_cmt_on_off > 0) &&
8497                     (SCTP_BASE_SYSCTL(sctp_buffer_splitting) & SCTP_SEND_BUFFER_SPLITTING) &&
8498                     (max_send_per_dest > 0) &&
8499                     (net->flight_size > max_send_per_dest)) {
8500                         goto no_data_fill;
8501                 }
8502                 /*********************/
8503                 /* Data transmission */
8504                 /*********************/
8505                 /*
8506                  * if AUTH for DATA is required and no AUTH has been added
8507                  * yet, account for this in the mtu now... if no data can be
8508                  * bundled, this adjustment won't matter anyways since the
8509                  * packet will be going out...
8510                  */
8511                 data_auth_reqd = sctp_auth_is_required_chunk(SCTP_DATA,
8512                     stcb->asoc.peer_auth_chunks);
8513                 if (data_auth_reqd && (auth == NULL)) {
8514                         mtu -= sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
8515                 }
8516                 /* now lets add any data within the MTU constraints */
8517                 switch (((struct sockaddr *)&net->ro._l_addr)->sa_family) {
8518 #ifdef INET
8519                 case AF_INET:
8520                         if (net->mtu > SCTP_MIN_V4_OVERHEAD)
8521                                 omtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
8522                         else
8523                                 omtu = 0;
8524                         break;
8525 #endif
8526 #ifdef INET6
8527                 case AF_INET6:
8528                         if (net->mtu > SCTP_MIN_OVERHEAD)
8529                                 omtu = net->mtu - SCTP_MIN_OVERHEAD;
8530                         else
8531                                 omtu = 0;
8532                         break;
8533 #endif
8534                 default:
8535                         /* TSNH */
8536                         omtu = 0;
8537                         break;
8538                 }
8539                 if ((((SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) ||
8540                     (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_RECEIVED)) &&
8541                     (skip_data_for_this_net == 0)) ||
8542                     (cookie)) {
8543                         TAILQ_FOREACH_SAFE(chk, &asoc->send_queue, sctp_next, nchk) {
8544                                 if (no_data_chunks) {
8545                                         /* let only control go out */
8546                                         *reason_code = 1;
8547                                         break;
8548                                 }
8549                                 if (net->flight_size >= net->cwnd) {
8550                                         /* skip this net, no room for data */
8551                                         *reason_code = 2;
8552                                         break;
8553                                 }
8554                                 if ((chk->whoTo != NULL) &&
8555                                     (chk->whoTo != net)) {
8556                                         /* Don't send the chunk on this net */
8557                                         continue;
8558                                 }
8559
8560                                 if (asoc->sctp_cmt_on_off == 0) {
8561                                         if ((asoc->alternate) &&
8562                                             (asoc->alternate != net) &&
8563                                             (chk->whoTo == NULL)) {
8564                                                 continue;
8565                                         } else if ((net != asoc->primary_destination) &&
8566                                                     (asoc->alternate == NULL) &&
8567                                             (chk->whoTo == NULL)) {
8568                                                 continue;
8569                                         }
8570                                 }
8571                                 if ((chk->send_size > omtu) && ((chk->flags & CHUNK_FLAGS_FRAGMENT_OK) == 0)) {
8572                                         /*-
8573                                          * strange, we have a chunk that is
8574                                          * to big for its destination and
8575                                          * yet no fragment ok flag.
8576                                          * Something went wrong when the
8577                                          * PMTU changed...we did not mark
8578                                          * this chunk for some reason?? I
8579                                          * will fix it here by letting IP
8580                                          * fragment it for now and printing
8581                                          * a warning. This really should not
8582                                          * happen ...
8583                                          */
8584                                         SCTP_PRINTF("Warning chunk of %d bytes > mtu:%d and yet PMTU disc missed\n",
8585                                             chk->send_size, mtu);
8586                                         chk->flags |= CHUNK_FLAGS_FRAGMENT_OK;
8587                                 }
8588                                 if (SCTP_BASE_SYSCTL(sctp_enable_sack_immediately) &&
8589                                     (asoc->state & SCTP_STATE_SHUTDOWN_PENDING)) {
8590                                         struct sctp_data_chunk *dchkh;
8591
8592                                         dchkh = mtod(chk->data, struct sctp_data_chunk *);
8593                                         dchkh->ch.chunk_flags |= SCTP_DATA_SACK_IMMEDIATELY;
8594                                 }
8595                                 if (((chk->send_size <= mtu) && (chk->send_size <= r_mtu)) ||
8596                                     ((chk->flags & CHUNK_FLAGS_FRAGMENT_OK) && (chk->send_size <= asoc->peers_rwnd))) {
8597                                         /* ok we will add this one */
8598
8599                                         /*
8600                                          * Add an AUTH chunk, if chunk
8601                                          * requires it, save the offset into
8602                                          * the chain for AUTH
8603                                          */
8604                                         if (data_auth_reqd) {
8605                                                 if (auth == NULL) {
8606                                                         outchain = sctp_add_auth_chunk(outchain,
8607                                                             &endoutchain,
8608                                                             &auth,
8609                                                             &auth_offset,
8610                                                             stcb,
8611                                                             SCTP_DATA);
8612                                                         auth_keyid = chk->auth_keyid;
8613                                                         override_ok = 0;
8614                                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8615                                                 } else if (override_ok) {
8616                                                         /*
8617                                                          * use this data's
8618                                                          * keyid
8619                                                          */
8620                                                         auth_keyid = chk->auth_keyid;
8621                                                         override_ok = 0;
8622                                                 } else if (auth_keyid != chk->auth_keyid) {
8623                                                         /*
8624                                                          * different keyid,
8625                                                          * so done bundling
8626                                                          */
8627                                                         break;
8628                                                 }
8629                                         }
8630                                         outchain = sctp_copy_mbufchain(chk->data, outchain, &endoutchain, 0,
8631                                             chk->send_size, chk->copy_by_ref);
8632                                         if (outchain == NULL) {
8633                                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "No memory?\n");
8634                                                 if (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
8635                                                         sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
8636                                                 }
8637                                                 *reason_code = 3;
8638                                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
8639                                                 return (ENOMEM);
8640                                         }
8641                                         /* update our MTU size */
8642                                         /* Do clear IP_DF ? */
8643                                         if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
8644                                                 no_fragmentflg = 0;
8645                                         }
8646                                         /* unsigned subtraction of mtu */
8647                                         if (mtu > chk->send_size)
8648                                                 mtu -= chk->send_size;
8649                                         else
8650                                                 mtu = 0;
8651                                         /* unsigned subtraction of r_mtu */
8652                                         if (r_mtu > chk->send_size)
8653                                                 r_mtu -= chk->send_size;
8654                                         else
8655                                                 r_mtu = 0;
8656
8657                                         to_out += chk->send_size;
8658                                         if ((to_out > mx_mtu) && no_fragmentflg) {
8659 #ifdef INVARIANTS
8660                                                 panic("Exceeding mtu of %d out size is %d", mx_mtu, to_out);
8661 #else
8662                                                 SCTP_PRINTF("Exceeding mtu of %d out size is %d\n",
8663                                                     mx_mtu, to_out);
8664 #endif
8665                                         }
8666                                         chk->window_probe = 0;
8667                                         data_list[bundle_at++] = chk;
8668                                         if (bundle_at >= SCTP_MAX_DATA_BUNDLING) {
8669                                                 break;
8670                                         }
8671                                         if (chk->sent == SCTP_DATAGRAM_UNSENT) {
8672                                                 if ((chk->rec.data.rcv_flags & SCTP_DATA_UNORDERED) == 0) {
8673                                                         SCTP_STAT_INCR_COUNTER64(sctps_outorderchunks);
8674                                                 } else {
8675                                                         SCTP_STAT_INCR_COUNTER64(sctps_outunorderchunks);
8676                                                 }
8677                                                 if (((chk->rec.data.rcv_flags & SCTP_DATA_LAST_FRAG) == SCTP_DATA_LAST_FRAG) &&
8678                                                     ((chk->rec.data.rcv_flags & SCTP_DATA_FIRST_FRAG) == 0))
8679                                                         /*
8680                                                          * Count number of
8681                                                          * user msg's that
8682                                                          * were fragmented
8683                                                          * we do this by
8684                                                          * counting when we
8685                                                          * see a LAST
8686                                                          * fragment only.
8687                                                          */
8688                                                         SCTP_STAT_INCR_COUNTER64(sctps_fragusrmsgs);
8689                                         }
8690                                         if ((mtu == 0) || (r_mtu == 0) || (one_chunk)) {
8691                                                 if ((one_chunk) && (stcb->asoc.total_flight == 0)) {
8692                                                         data_list[0]->window_probe = 1;
8693                                                         net->window_probe = 1;
8694                                                 }
8695                                                 break;
8696                                         }
8697                                 } else {
8698                                         /*
8699                                          * Must be sent in order of the
8700                                          * TSN's (on a network)
8701                                          */
8702                                         break;
8703                                 }
8704                         }       /* for (chunk gather loop for this net) */
8705                 }               /* if asoc.state OPEN */
8706 no_data_fill:
8707                 /* Is there something to send for this destination? */
8708                 if (outchain) {
8709                         /* We may need to start a control timer or two */
8710                         if (asconf) {
8711                                 sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp,
8712                                     stcb, net);
8713                                 /*
8714                                  * do NOT clear the asconf flag as it is
8715                                  * used to do appropriate source address
8716                                  * selection.
8717                                  */
8718                         }
8719                         if (cookie) {
8720                                 sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, inp, stcb, net);
8721                                 cookie = 0;
8722                         }
8723                         /* must start a send timer if data is being sent */
8724                         if (bundle_at && (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer))) {
8725                                 /*
8726                                  * no timer running on this destination
8727                                  * restart it.
8728                                  */
8729                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
8730                         }
8731                         if (bundle_at || hbflag) {
8732                                 /* For data/asconf and hb set time */
8733                                 if (*now_filled == 0) {
8734                                         (void)SCTP_GETTIME_TIMEVAL(now);
8735                                         *now_filled = 1;
8736                                 }
8737                                 net->last_sent_time = *now;
8738                         }
8739                         /* Now send it, if there is anything to send :> */
8740                         if ((error = sctp_lowlevel_chunk_output(inp,
8741                             stcb,
8742                             net,
8743                             (struct sockaddr *)&net->ro._l_addr,
8744                             outchain,
8745                             auth_offset,
8746                             auth,
8747                             auth_keyid,
8748                             no_fragmentflg,
8749                             bundle_at,
8750                             asconf,
8751                             inp->sctp_lport, stcb->rport,
8752                             htonl(stcb->asoc.peer_vtag),
8753                             net->port, NULL,
8754                             0, 0,
8755                             so_locked))) {
8756                                 /* error, we could not output */
8757                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
8758                                 if (from_where == 0) {
8759                                         SCTP_STAT_INCR(sctps_lowlevelerrusr);
8760                                 }
8761                                 if (error == ENOBUFS) {
8762                                         asoc->ifp_had_enobuf = 1;
8763                                         SCTP_STAT_INCR(sctps_lowlevelerr);
8764                                 }
8765                                 if (error == EHOSTUNREACH) {
8766                                         /*
8767                                          * Destination went unreachable
8768                                          * during this send
8769                                          */
8770                                         sctp_move_chunks_from_net(stcb, net);
8771                                 }
8772                                 *reason_code = 6;
8773                                 /*-
8774                                  * I add this line to be paranoid. As far as
8775                                  * I can tell the continue, takes us back to
8776                                  * the top of the for, but just to make sure
8777                                  * I will reset these again here.
8778                                  */
8779                                 ctl_cnt = 0;
8780                                 continue;       /* This takes us back to the
8781                                                  * for() for the nets. */
8782                         } else {
8783                                 asoc->ifp_had_enobuf = 0;
8784                         }
8785                         endoutchain = NULL;
8786                         auth = NULL;
8787                         auth_offset = 0;
8788                         if (!no_out_cnt) {
8789                                 *num_out += (ctl_cnt + bundle_at);
8790                         }
8791                         if (bundle_at) {
8792                                 /* setup for a RTO measurement */
8793                                 tsns_sent = data_list[0]->rec.data.tsn;
8794                                 /* fill time if not already filled */
8795                                 if (*now_filled == 0) {
8796                                         (void)SCTP_GETTIME_TIMEVAL(&asoc->time_last_sent);
8797                                         *now_filled = 1;
8798                                         *now = asoc->time_last_sent;
8799                                 } else {
8800                                         asoc->time_last_sent = *now;
8801                                 }
8802                                 if (net->rto_needed) {
8803                                         data_list[0]->do_rtt = 1;
8804                                         net->rto_needed = 0;
8805                                 }
8806                                 SCTP_STAT_INCR_BY(sctps_senddata, bundle_at);
8807                                 sctp_clean_up_datalist(stcb, asoc, data_list, bundle_at, net);
8808                         }
8809                         if (one_chunk) {
8810                                 break;
8811                         }
8812                 }
8813                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
8814                         sctp_log_cwnd(stcb, net, tsns_sent, SCTP_CWND_LOG_FROM_SEND);
8815                 }
8816         }
8817         if (old_start_at == NULL) {
8818                 old_start_at = start_at;
8819                 start_at = TAILQ_FIRST(&asoc->nets);
8820                 if (old_start_at)
8821                         goto again_one_more_time;
8822         }
8823
8824         /*
8825          * At the end there should be no NON timed chunks hanging on this
8826          * queue.
8827          */
8828         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
8829                 sctp_log_cwnd(stcb, net, *num_out, SCTP_CWND_LOG_FROM_SEND);
8830         }
8831         if ((*num_out == 0) && (*reason_code == 0)) {
8832                 *reason_code = 4;
8833         } else {
8834                 *reason_code = 5;
8835         }
8836         sctp_clean_up_ctl(stcb, asoc, so_locked);
8837         return (0);
8838 }
8839
8840 void
8841 sctp_queue_op_err(struct sctp_tcb *stcb, struct mbuf *op_err)
8842 {
8843         /*-
8844          * Prepend a OPERATIONAL_ERROR chunk header and put on the end of
8845          * the control chunk queue.
8846          */
8847         struct sctp_chunkhdr *hdr;
8848         struct sctp_tmit_chunk *chk;
8849         struct mbuf *mat, *last_mbuf;
8850         uint32_t chunk_length;
8851         uint16_t padding_length;
8852
8853         SCTP_TCB_LOCK_ASSERT(stcb);
8854         SCTP_BUF_PREPEND(op_err, sizeof(struct sctp_chunkhdr), M_NOWAIT);
8855         if (op_err == NULL) {
8856                 return;
8857         }
8858         last_mbuf = NULL;
8859         chunk_length = 0;
8860         for (mat = op_err; mat != NULL; mat = SCTP_BUF_NEXT(mat)) {
8861                 chunk_length += SCTP_BUF_LEN(mat);
8862                 if (SCTP_BUF_NEXT(mat) == NULL) {
8863                         last_mbuf = mat;
8864                 }
8865         }
8866         if (chunk_length > SCTP_MAX_CHUNK_LENGTH) {
8867                 sctp_m_freem(op_err);
8868                 return;
8869         }
8870         padding_length = chunk_length % 4;
8871         if (padding_length != 0) {
8872                 padding_length = 4 - padding_length;
8873         }
8874         if (padding_length != 0) {
8875                 if (sctp_add_pad_tombuf(last_mbuf, padding_length) == NULL) {
8876                         sctp_m_freem(op_err);
8877                         return;
8878                 }
8879         }
8880         sctp_alloc_a_chunk(stcb, chk);
8881         if (chk == NULL) {
8882                 /* no memory */
8883                 sctp_m_freem(op_err);
8884                 return;
8885         }
8886         chk->copy_by_ref = 0;
8887         chk->rec.chunk_id.id = SCTP_OPERATION_ERROR;
8888         chk->rec.chunk_id.can_take_data = 0;
8889         chk->flags = 0;
8890         chk->send_size = (uint16_t)chunk_length;
8891         chk->sent = SCTP_DATAGRAM_UNSENT;
8892         chk->snd_count = 0;
8893         chk->asoc = &stcb->asoc;
8894         chk->data = op_err;
8895         chk->whoTo = NULL;
8896         hdr = mtod(op_err, struct sctp_chunkhdr *);
8897         hdr->chunk_type = SCTP_OPERATION_ERROR;
8898         hdr->chunk_flags = 0;
8899         hdr->chunk_length = htons(chk->send_size);
8900         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
8901         chk->asoc->ctrl_queue_cnt++;
8902 }
8903
8904 int
8905 sctp_send_cookie_echo(struct mbuf *m,
8906     int offset, int limit,
8907     struct sctp_tcb *stcb,
8908     struct sctp_nets *net)
8909 {
8910         /*-
8911          * pull out the cookie and put it at the front of the control chunk
8912          * queue.
8913          */
8914         int at;
8915         struct mbuf *cookie;
8916         struct sctp_paramhdr param, *phdr;
8917         struct sctp_chunkhdr *hdr;
8918         struct sctp_tmit_chunk *chk;
8919         uint16_t ptype, plen;
8920
8921         SCTP_TCB_LOCK_ASSERT(stcb);
8922         /* First find the cookie in the param area */
8923         cookie = NULL;
8924         at = offset + sizeof(struct sctp_init_chunk);
8925         for (;;) {
8926                 phdr = sctp_get_next_param(m, at, &param, sizeof(param));
8927                 if (phdr == NULL) {
8928                         return (-3);
8929                 }
8930                 ptype = ntohs(phdr->param_type);
8931                 plen = ntohs(phdr->param_length);
8932                 if (plen < sizeof(struct sctp_paramhdr)) {
8933                         return (-6);
8934                 }
8935                 if (ptype == SCTP_STATE_COOKIE) {
8936                         int pad;
8937
8938                         /* found the cookie */
8939                         if (at + plen > limit) {
8940                                 return (-7);
8941                         }
8942                         cookie = SCTP_M_COPYM(m, at, plen, M_NOWAIT);
8943                         if (cookie == NULL) {
8944                                 /* No memory */
8945                                 return (-2);
8946                         }
8947                         if ((pad = (plen % 4)) > 0) {
8948                                 pad = 4 - pad;
8949                         }
8950                         if (pad > 0) {
8951                                 if (sctp_pad_lastmbuf(cookie, pad, NULL) == NULL) {
8952                                         return (-8);
8953                                 }
8954                         }
8955 #ifdef SCTP_MBUF_LOGGING
8956                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
8957                                 sctp_log_mbc(cookie, SCTP_MBUF_ICOPY);
8958                         }
8959 #endif
8960                         break;
8961                 }
8962                 at += SCTP_SIZE32(plen);
8963         }
8964         /* ok, we got the cookie lets change it into a cookie echo chunk */
8965         /* first the change from param to cookie */
8966         hdr = mtod(cookie, struct sctp_chunkhdr *);
8967         hdr->chunk_type = SCTP_COOKIE_ECHO;
8968         hdr->chunk_flags = 0;
8969         /* get the chunk stuff now and place it in the FRONT of the queue */
8970         sctp_alloc_a_chunk(stcb, chk);
8971         if (chk == NULL) {
8972                 /* no memory */
8973                 sctp_m_freem(cookie);
8974                 return (-5);
8975         }
8976         chk->copy_by_ref = 0;
8977         chk->rec.chunk_id.id = SCTP_COOKIE_ECHO;
8978         chk->rec.chunk_id.can_take_data = 0;
8979         chk->flags = CHUNK_FLAGS_FRAGMENT_OK;
8980         chk->send_size = SCTP_SIZE32(plen);
8981         chk->sent = SCTP_DATAGRAM_UNSENT;
8982         chk->snd_count = 0;
8983         chk->asoc = &stcb->asoc;
8984         chk->data = cookie;
8985         chk->whoTo = net;
8986         atomic_add_int(&chk->whoTo->ref_count, 1);
8987         TAILQ_INSERT_HEAD(&chk->asoc->control_send_queue, chk, sctp_next);
8988         chk->asoc->ctrl_queue_cnt++;
8989         return (0);
8990 }
8991
8992 void
8993 sctp_send_heartbeat_ack(struct sctp_tcb *stcb,
8994     struct mbuf *m,
8995     int offset,
8996     int chk_length,
8997     struct sctp_nets *net)
8998 {
8999         /*
9000          * take a HB request and make it into a HB ack and send it.
9001          */
9002         struct mbuf *outchain;
9003         struct sctp_chunkhdr *chdr;
9004         struct sctp_tmit_chunk *chk;
9005
9006         if (net == NULL)
9007                 /* must have a net pointer */
9008                 return;
9009
9010         outchain = SCTP_M_COPYM(m, offset, chk_length, M_NOWAIT);
9011         if (outchain == NULL) {
9012                 /* gak out of memory */
9013                 return;
9014         }
9015 #ifdef SCTP_MBUF_LOGGING
9016         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
9017                 sctp_log_mbc(outchain, SCTP_MBUF_ICOPY);
9018         }
9019 #endif
9020         chdr = mtod(outchain, struct sctp_chunkhdr *);
9021         chdr->chunk_type = SCTP_HEARTBEAT_ACK;
9022         chdr->chunk_flags = 0;
9023         if (chk_length % 4 != 0) {
9024                 sctp_pad_lastmbuf(outchain, 4 - (chk_length % 4), NULL);
9025         }
9026         sctp_alloc_a_chunk(stcb, chk);
9027         if (chk == NULL) {
9028                 /* no memory */
9029                 sctp_m_freem(outchain);
9030                 return;
9031         }
9032         chk->copy_by_ref = 0;
9033         chk->rec.chunk_id.id = SCTP_HEARTBEAT_ACK;
9034         chk->rec.chunk_id.can_take_data = 1;
9035         chk->flags = 0;
9036         chk->send_size = chk_length;
9037         chk->sent = SCTP_DATAGRAM_UNSENT;
9038         chk->snd_count = 0;
9039         chk->asoc = &stcb->asoc;
9040         chk->data = outchain;
9041         chk->whoTo = net;
9042         atomic_add_int(&chk->whoTo->ref_count, 1);
9043         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9044         chk->asoc->ctrl_queue_cnt++;
9045 }
9046
9047 void
9048 sctp_send_cookie_ack(struct sctp_tcb *stcb)
9049 {
9050         /* formulate and queue a cookie-ack back to sender */
9051         struct mbuf *cookie_ack;
9052         struct sctp_chunkhdr *hdr;
9053         struct sctp_tmit_chunk *chk;
9054
9055         SCTP_TCB_LOCK_ASSERT(stcb);
9056
9057         cookie_ack = sctp_get_mbuf_for_msg(sizeof(struct sctp_chunkhdr), 0, M_NOWAIT, 1, MT_HEADER);
9058         if (cookie_ack == NULL) {
9059                 /* no mbuf's */
9060                 return;
9061         }
9062         SCTP_BUF_RESV_UF(cookie_ack, SCTP_MIN_OVERHEAD);
9063         sctp_alloc_a_chunk(stcb, chk);
9064         if (chk == NULL) {
9065                 /* no memory */
9066                 sctp_m_freem(cookie_ack);
9067                 return;
9068         }
9069         chk->copy_by_ref = 0;
9070         chk->rec.chunk_id.id = SCTP_COOKIE_ACK;
9071         chk->rec.chunk_id.can_take_data = 1;
9072         chk->flags = 0;
9073         chk->send_size = sizeof(struct sctp_chunkhdr);
9074         chk->sent = SCTP_DATAGRAM_UNSENT;
9075         chk->snd_count = 0;
9076         chk->asoc = &stcb->asoc;
9077         chk->data = cookie_ack;
9078         if (chk->asoc->last_control_chunk_from != NULL) {
9079                 chk->whoTo = chk->asoc->last_control_chunk_from;
9080                 atomic_add_int(&chk->whoTo->ref_count, 1);
9081         } else {
9082                 chk->whoTo = NULL;
9083         }
9084         hdr = mtod(cookie_ack, struct sctp_chunkhdr *);
9085         hdr->chunk_type = SCTP_COOKIE_ACK;
9086         hdr->chunk_flags = 0;
9087         hdr->chunk_length = htons(chk->send_size);
9088         SCTP_BUF_LEN(cookie_ack) = chk->send_size;
9089         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9090         chk->asoc->ctrl_queue_cnt++;
9091         return;
9092 }
9093
9094 void
9095 sctp_send_shutdown_ack(struct sctp_tcb *stcb, struct sctp_nets *net)
9096 {
9097         /* formulate and queue a SHUTDOWN-ACK back to the sender */
9098         struct mbuf *m_shutdown_ack;
9099         struct sctp_shutdown_ack_chunk *ack_cp;
9100         struct sctp_tmit_chunk *chk;
9101
9102         m_shutdown_ack = sctp_get_mbuf_for_msg(sizeof(struct sctp_shutdown_ack_chunk), 0, M_NOWAIT, 1, MT_HEADER);
9103         if (m_shutdown_ack == NULL) {
9104                 /* no mbuf's */
9105                 return;
9106         }
9107         SCTP_BUF_RESV_UF(m_shutdown_ack, SCTP_MIN_OVERHEAD);
9108         sctp_alloc_a_chunk(stcb, chk);
9109         if (chk == NULL) {
9110                 /* no memory */
9111                 sctp_m_freem(m_shutdown_ack);
9112                 return;
9113         }
9114         chk->copy_by_ref = 0;
9115         chk->rec.chunk_id.id = SCTP_SHUTDOWN_ACK;
9116         chk->rec.chunk_id.can_take_data = 1;
9117         chk->flags = 0;
9118         chk->send_size = sizeof(struct sctp_chunkhdr);
9119         chk->sent = SCTP_DATAGRAM_UNSENT;
9120         chk->snd_count = 0;
9121         chk->asoc = &stcb->asoc;
9122         chk->data = m_shutdown_ack;
9123         chk->whoTo = net;
9124         if (chk->whoTo) {
9125                 atomic_add_int(&chk->whoTo->ref_count, 1);
9126         }
9127         ack_cp = mtod(m_shutdown_ack, struct sctp_shutdown_ack_chunk *);
9128         ack_cp->ch.chunk_type = SCTP_SHUTDOWN_ACK;
9129         ack_cp->ch.chunk_flags = 0;
9130         ack_cp->ch.chunk_length = htons(chk->send_size);
9131         SCTP_BUF_LEN(m_shutdown_ack) = chk->send_size;
9132         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9133         chk->asoc->ctrl_queue_cnt++;
9134         return;
9135 }
9136
9137 void
9138 sctp_send_shutdown(struct sctp_tcb *stcb, struct sctp_nets *net)
9139 {
9140         /* formulate and queue a SHUTDOWN to the sender */
9141         struct mbuf *m_shutdown;
9142         struct sctp_shutdown_chunk *shutdown_cp;
9143         struct sctp_tmit_chunk *chk;
9144
9145         TAILQ_FOREACH(chk, &stcb->asoc.control_send_queue, sctp_next) {
9146                 if (chk->rec.chunk_id.id == SCTP_SHUTDOWN) {
9147                         /* We already have a SHUTDOWN queued. Reuse it. */
9148                         if (chk->whoTo) {
9149                                 sctp_free_remote_addr(chk->whoTo);
9150                                 chk->whoTo = NULL;
9151                         }
9152                         break;
9153                 }
9154         }
9155         if (chk == NULL) {
9156                 m_shutdown = sctp_get_mbuf_for_msg(sizeof(struct sctp_shutdown_chunk), 0, M_NOWAIT, 1, MT_HEADER);
9157                 if (m_shutdown == NULL) {
9158                         /* no mbuf's */
9159                         return;
9160                 }
9161                 SCTP_BUF_RESV_UF(m_shutdown, SCTP_MIN_OVERHEAD);
9162                 sctp_alloc_a_chunk(stcb, chk);
9163                 if (chk == NULL) {
9164                         /* no memory */
9165                         sctp_m_freem(m_shutdown);
9166                         return;
9167                 }
9168                 chk->copy_by_ref = 0;
9169                 chk->rec.chunk_id.id = SCTP_SHUTDOWN;
9170                 chk->rec.chunk_id.can_take_data = 1;
9171                 chk->flags = 0;
9172                 chk->send_size = sizeof(struct sctp_shutdown_chunk);
9173                 chk->sent = SCTP_DATAGRAM_UNSENT;
9174                 chk->snd_count = 0;
9175                 chk->asoc = &stcb->asoc;
9176                 chk->data = m_shutdown;
9177                 chk->whoTo = net;
9178                 if (chk->whoTo) {
9179                         atomic_add_int(&chk->whoTo->ref_count, 1);
9180                 }
9181                 shutdown_cp = mtod(m_shutdown, struct sctp_shutdown_chunk *);
9182                 shutdown_cp->ch.chunk_type = SCTP_SHUTDOWN;
9183                 shutdown_cp->ch.chunk_flags = 0;
9184                 shutdown_cp->ch.chunk_length = htons(chk->send_size);
9185                 shutdown_cp->cumulative_tsn_ack = htonl(stcb->asoc.cumulative_tsn);
9186                 SCTP_BUF_LEN(m_shutdown) = chk->send_size;
9187                 TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9188                 chk->asoc->ctrl_queue_cnt++;
9189         } else {
9190                 TAILQ_REMOVE(&stcb->asoc.control_send_queue, chk, sctp_next);
9191                 chk->whoTo = net;
9192                 if (chk->whoTo) {
9193                         atomic_add_int(&chk->whoTo->ref_count, 1);
9194                 }
9195                 shutdown_cp = mtod(chk->data, struct sctp_shutdown_chunk *);
9196                 shutdown_cp->cumulative_tsn_ack = htonl(stcb->asoc.cumulative_tsn);
9197                 TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
9198         }
9199         return;
9200 }
9201
9202 void
9203 sctp_send_asconf(struct sctp_tcb *stcb, struct sctp_nets *net, int addr_locked)
9204 {
9205         /*
9206          * formulate and queue an ASCONF to the peer. ASCONF parameters
9207          * should be queued on the assoc queue.
9208          */
9209         struct sctp_tmit_chunk *chk;
9210         struct mbuf *m_asconf;
9211         int len;
9212
9213         SCTP_TCB_LOCK_ASSERT(stcb);
9214
9215         if ((!TAILQ_EMPTY(&stcb->asoc.asconf_send_queue)) &&
9216             (!sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_MULTIPLE_ASCONFS))) {
9217                 /* can't send a new one if there is one in flight already */
9218                 return;
9219         }
9220
9221         /* compose an ASCONF chunk, maximum length is PMTU */
9222         m_asconf = sctp_compose_asconf(stcb, &len, addr_locked);
9223         if (m_asconf == NULL) {
9224                 return;
9225         }
9226
9227         sctp_alloc_a_chunk(stcb, chk);
9228         if (chk == NULL) {
9229                 /* no memory */
9230                 sctp_m_freem(m_asconf);
9231                 return;
9232         }
9233
9234         chk->copy_by_ref = 0;
9235         chk->rec.chunk_id.id = SCTP_ASCONF;
9236         chk->rec.chunk_id.can_take_data = 0;
9237         chk->flags = CHUNK_FLAGS_FRAGMENT_OK;
9238         chk->data = m_asconf;
9239         chk->send_size = len;
9240         chk->sent = SCTP_DATAGRAM_UNSENT;
9241         chk->snd_count = 0;
9242         chk->asoc = &stcb->asoc;
9243         chk->whoTo = net;
9244         if (chk->whoTo) {
9245                 atomic_add_int(&chk->whoTo->ref_count, 1);
9246         }
9247         TAILQ_INSERT_TAIL(&chk->asoc->asconf_send_queue, chk, sctp_next);
9248         chk->asoc->ctrl_queue_cnt++;
9249         return;
9250 }
9251
9252 void
9253 sctp_send_asconf_ack(struct sctp_tcb *stcb)
9254 {
9255         /*
9256          * formulate and queue a asconf-ack back to sender. the asconf-ack
9257          * must be stored in the tcb.
9258          */
9259         struct sctp_tmit_chunk *chk;
9260         struct sctp_asconf_ack *ack, *latest_ack;
9261         struct mbuf *m_ack;
9262         struct sctp_nets *net = NULL;
9263
9264         SCTP_TCB_LOCK_ASSERT(stcb);
9265         /* Get the latest ASCONF-ACK */
9266         latest_ack = TAILQ_LAST(&stcb->asoc.asconf_ack_sent, sctp_asconf_ackhead);
9267         if (latest_ack == NULL) {
9268                 return;
9269         }
9270         if (latest_ack->last_sent_to != NULL &&
9271             latest_ack->last_sent_to == stcb->asoc.last_control_chunk_from) {
9272                 /* we're doing a retransmission */
9273                 net = sctp_find_alternate_net(stcb, stcb->asoc.last_control_chunk_from, 0);
9274                 if (net == NULL) {
9275                         /* no alternate */
9276                         if (stcb->asoc.last_control_chunk_from == NULL) {
9277                                 if (stcb->asoc.alternate) {
9278                                         net = stcb->asoc.alternate;
9279                                 } else {
9280                                         net = stcb->asoc.primary_destination;
9281                                 }
9282                         } else {
9283                                 net = stcb->asoc.last_control_chunk_from;
9284                         }
9285                 }
9286         } else {
9287                 /* normal case */
9288                 if (stcb->asoc.last_control_chunk_from == NULL) {
9289                         if (stcb->asoc.alternate) {
9290                                 net = stcb->asoc.alternate;
9291                         } else {
9292                                 net = stcb->asoc.primary_destination;
9293                         }
9294                 } else {
9295                         net = stcb->asoc.last_control_chunk_from;
9296                 }
9297         }
9298         latest_ack->last_sent_to = net;
9299
9300         TAILQ_FOREACH(ack, &stcb->asoc.asconf_ack_sent, next) {
9301                 if (ack->data == NULL) {
9302                         continue;
9303                 }
9304
9305                 /* copy the asconf_ack */
9306                 m_ack = SCTP_M_COPYM(ack->data, 0, M_COPYALL, M_NOWAIT);
9307                 if (m_ack == NULL) {
9308                         /* couldn't copy it */
9309                         return;
9310                 }
9311 #ifdef SCTP_MBUF_LOGGING
9312                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
9313                         sctp_log_mbc(m_ack, SCTP_MBUF_ICOPY);
9314                 }
9315 #endif
9316
9317                 sctp_alloc_a_chunk(stcb, chk);
9318                 if (chk == NULL) {
9319                         /* no memory */
9320                         if (m_ack)
9321                                 sctp_m_freem(m_ack);
9322                         return;
9323                 }
9324                 chk->copy_by_ref = 0;
9325                 chk->rec.chunk_id.id = SCTP_ASCONF_ACK;
9326                 chk->rec.chunk_id.can_take_data = 1;
9327                 chk->flags = CHUNK_FLAGS_FRAGMENT_OK;
9328                 chk->whoTo = net;
9329                 if (chk->whoTo) {
9330                         atomic_add_int(&chk->whoTo->ref_count, 1);
9331                 }
9332                 chk->data = m_ack;
9333                 chk->send_size = ack->len;
9334                 chk->sent = SCTP_DATAGRAM_UNSENT;
9335                 chk->snd_count = 0;
9336                 chk->asoc = &stcb->asoc;
9337
9338                 TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9339                 chk->asoc->ctrl_queue_cnt++;
9340         }
9341         return;
9342 }
9343
9344 static int
9345 sctp_chunk_retransmission(struct sctp_inpcb *inp,
9346     struct sctp_tcb *stcb,
9347     struct sctp_association *asoc,
9348     int *cnt_out, struct timeval *now, int *now_filled, int *fr_done, int so_locked)
9349 {
9350         /*-
9351          * send out one MTU of retransmission. If fast_retransmit is
9352          * happening we ignore the cwnd. Otherwise we obey the cwnd and
9353          * rwnd. For a Cookie or Asconf in the control chunk queue we
9354          * retransmit them by themselves.
9355          *
9356          * For data chunks we will pick out the lowest TSN's in the sent_queue
9357          * marked for resend and bundle them all together (up to a MTU of
9358          * destination). The address to send to should have been
9359          * selected/changed where the retransmission was marked (i.e. in FR
9360          * or t3-timeout routines).
9361          */
9362         struct sctp_tmit_chunk *data_list[SCTP_MAX_DATA_BUNDLING];
9363         struct sctp_tmit_chunk *chk, *fwd;
9364         struct mbuf *m, *endofchain;
9365         struct sctp_nets *net = NULL;
9366         uint32_t tsns_sent = 0;
9367         int no_fragmentflg, bundle_at;
9368         unsigned int mtu;
9369         int error, i, one_chunk, fwd_tsn, ctl_cnt, tmr_started;
9370         struct sctp_auth_chunk *auth = NULL;
9371         uint32_t auth_offset = 0;
9372         uint16_t auth_keyid;
9373         int override_ok = 1;
9374         int data_auth_reqd = 0;
9375         uint32_t dmtu = 0;
9376
9377         SCTP_TCB_LOCK_ASSERT(stcb);
9378         tmr_started = ctl_cnt = 0;
9379         no_fragmentflg = 1;
9380         fwd_tsn = 0;
9381         *cnt_out = 0;
9382         fwd = NULL;
9383         endofchain = m = NULL;
9384         auth_keyid = stcb->asoc.authinfo.active_keyid;
9385 #ifdef SCTP_AUDITING_ENABLED
9386         sctp_audit_log(0xC3, 1);
9387 #endif
9388         if ((TAILQ_EMPTY(&asoc->sent_queue)) &&
9389             (TAILQ_EMPTY(&asoc->control_send_queue))) {
9390                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "SCTP hits empty queue with cnt set to %d?\n",
9391                     asoc->sent_queue_retran_cnt);
9392                 asoc->sent_queue_cnt = 0;
9393                 asoc->sent_queue_cnt_removeable = 0;
9394                 /* send back 0/0 so we enter normal transmission */
9395                 *cnt_out = 0;
9396                 return (0);
9397         }
9398         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
9399                 if ((chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) ||
9400                     (chk->rec.chunk_id.id == SCTP_STREAM_RESET) ||
9401                     (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN)) {
9402                         if (chk->sent != SCTP_DATAGRAM_RESEND) {
9403                                 continue;
9404                         }
9405                         if (chk->rec.chunk_id.id == SCTP_STREAM_RESET) {
9406                                 if (chk != asoc->str_reset) {
9407                                         /*
9408                                          * not eligible for retran if its
9409                                          * not ours
9410                                          */
9411                                         continue;
9412                                 }
9413                         }
9414                         ctl_cnt++;
9415                         if (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN) {
9416                                 fwd_tsn = 1;
9417                         }
9418                         /*
9419                          * Add an AUTH chunk, if chunk requires it save the
9420                          * offset into the chain for AUTH
9421                          */
9422                         if ((auth == NULL) &&
9423                             (sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
9424                             stcb->asoc.peer_auth_chunks))) {
9425                                 m = sctp_add_auth_chunk(m, &endofchain,
9426                                     &auth, &auth_offset,
9427                                     stcb,
9428                                     chk->rec.chunk_id.id);
9429                                 SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
9430                         }
9431                         m = sctp_copy_mbufchain(chk->data, m, &endofchain, 0, chk->send_size, chk->copy_by_ref);
9432                         break;
9433                 }
9434         }
9435         one_chunk = 0;
9436         /* do we have control chunks to retransmit? */
9437         if (m != NULL) {
9438                 /* Start a timer no matter if we succeed or fail */
9439                 if (chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
9440                         sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, inp, stcb, chk->whoTo);
9441                 } else if (chk->rec.chunk_id.id == SCTP_ASCONF)
9442                         sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp, stcb, chk->whoTo);
9443                 chk->snd_count++;       /* update our count */
9444                 if ((error = sctp_lowlevel_chunk_output(inp, stcb, chk->whoTo,
9445                     (struct sockaddr *)&chk->whoTo->ro._l_addr, m,
9446                     auth_offset, auth, stcb->asoc.authinfo.active_keyid,
9447                     no_fragmentflg, 0, 0,
9448                     inp->sctp_lport, stcb->rport, htonl(stcb->asoc.peer_vtag),
9449                     chk->whoTo->port, NULL,
9450                     0, 0,
9451                     so_locked))) {
9452                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
9453                         if (error == ENOBUFS) {
9454                                 asoc->ifp_had_enobuf = 1;
9455                                 SCTP_STAT_INCR(sctps_lowlevelerr);
9456                         }
9457                         return (error);
9458                 } else {
9459                         asoc->ifp_had_enobuf = 0;
9460                 }
9461                 endofchain = NULL;
9462                 auth = NULL;
9463                 auth_offset = 0;
9464                 /*
9465                  * We don't want to mark the net->sent time here since this
9466                  * we use this for HB and retrans cannot measure RTT
9467                  */
9468                 /* (void)SCTP_GETTIME_TIMEVAL(&chk->whoTo->last_sent_time); */
9469                 *cnt_out += 1;
9470                 chk->sent = SCTP_DATAGRAM_SENT;
9471                 sctp_ucount_decr(stcb->asoc.sent_queue_retran_cnt);
9472                 if (fwd_tsn == 0) {
9473                         return (0);
9474                 } else {
9475                         /* Clean up the fwd-tsn list */
9476                         sctp_clean_up_ctl(stcb, asoc, so_locked);
9477                         return (0);
9478                 }
9479         }
9480         /*
9481          * Ok, it is just data retransmission we need to do or that and a
9482          * fwd-tsn with it all.
9483          */
9484         if (TAILQ_EMPTY(&asoc->sent_queue)) {
9485                 return (SCTP_RETRAN_DONE);
9486         }
9487         if ((SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED) ||
9488             (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_WAIT)) {
9489                 /* not yet open, resend the cookie and that is it */
9490                 return (1);
9491         }
9492 #ifdef SCTP_AUDITING_ENABLED
9493         sctp_auditing(20, inp, stcb, NULL);
9494 #endif
9495         data_auth_reqd = sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks);
9496         TAILQ_FOREACH(chk, &asoc->sent_queue, sctp_next) {
9497                 if (chk->sent != SCTP_DATAGRAM_RESEND) {
9498                         /* No, not sent to this net or not ready for rtx */
9499                         continue;
9500                 }
9501                 if (chk->data == NULL) {
9502                         SCTP_PRINTF("TSN:%x chk->snd_count:%d chk->sent:%d can't retran - no data\n",
9503                             chk->rec.data.tsn, chk->snd_count, chk->sent);
9504                         continue;
9505                 }
9506                 if ((SCTP_BASE_SYSCTL(sctp_max_retran_chunk)) &&
9507                     (chk->snd_count >= SCTP_BASE_SYSCTL(sctp_max_retran_chunk))) {
9508                         struct mbuf *op_err;
9509                         char msg[SCTP_DIAG_INFO_LEN];
9510
9511                         SCTP_SNPRINTF(msg, sizeof(msg), "TSN %8.8x retransmitted %d times, giving up",
9512                             chk->rec.data.tsn, chk->snd_count);
9513                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
9514                             msg);
9515                         atomic_add_int(&stcb->asoc.refcnt, 1);
9516                         sctp_abort_an_association(stcb->sctp_ep, stcb, op_err,
9517                             false, so_locked);
9518                         SCTP_TCB_LOCK(stcb);
9519                         atomic_subtract_int(&stcb->asoc.refcnt, 1);
9520                         return (SCTP_RETRAN_EXIT);
9521                 }
9522                 /* pick up the net */
9523                 net = chk->whoTo;
9524                 switch (net->ro._l_addr.sa.sa_family) {
9525 #ifdef INET
9526                 case AF_INET:
9527                         mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
9528                         break;
9529 #endif
9530 #ifdef INET6
9531                 case AF_INET6:
9532                         mtu = net->mtu - SCTP_MIN_OVERHEAD;
9533                         break;
9534 #endif
9535                 default:
9536                         /* TSNH */
9537                         mtu = net->mtu;
9538                         break;
9539                 }
9540
9541                 if ((asoc->peers_rwnd < mtu) && (asoc->total_flight > 0)) {
9542                         /* No room in peers rwnd */
9543                         uint32_t tsn;
9544
9545                         tsn = asoc->last_acked_seq + 1;
9546                         if (tsn == chk->rec.data.tsn) {
9547                                 /*
9548                                  * we make a special exception for this
9549                                  * case. The peer has no rwnd but is missing
9550                                  * the lowest chunk.. which is probably what
9551                                  * is holding up the rwnd.
9552                                  */
9553                                 goto one_chunk_around;
9554                         }
9555                         return (1);
9556                 }
9557 one_chunk_around:
9558                 if (asoc->peers_rwnd < mtu) {
9559                         one_chunk = 1;
9560                         if ((asoc->peers_rwnd == 0) &&
9561                             (asoc->total_flight == 0)) {
9562                                 chk->window_probe = 1;
9563                                 chk->whoTo->window_probe = 1;
9564                         }
9565                 }
9566 #ifdef SCTP_AUDITING_ENABLED
9567                 sctp_audit_log(0xC3, 2);
9568 #endif
9569                 bundle_at = 0;
9570                 m = NULL;
9571                 net->fast_retran_ip = 0;
9572                 if (chk->rec.data.doing_fast_retransmit == 0) {
9573                         /*
9574                          * if no FR in progress skip destination that have
9575                          * flight_size > cwnd.
9576                          */
9577                         if (net->flight_size >= net->cwnd) {
9578                                 continue;
9579                         }
9580                 } else {
9581                         /*
9582                          * Mark the destination net to have FR recovery
9583                          * limits put on it.
9584                          */
9585                         *fr_done = 1;
9586                         net->fast_retran_ip = 1;
9587                 }
9588
9589                 /*
9590                  * if no AUTH is yet included and this chunk requires it,
9591                  * make sure to account for it.  We don't apply the size
9592                  * until the AUTH chunk is actually added below in case
9593                  * there is no room for this chunk.
9594                  */
9595                 if (data_auth_reqd && (auth == NULL)) {
9596                         dmtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
9597                 } else
9598                         dmtu = 0;
9599
9600                 if ((chk->send_size <= (mtu - dmtu)) ||
9601                     (chk->flags & CHUNK_FLAGS_FRAGMENT_OK)) {
9602                         /* ok we will add this one */
9603                         if (data_auth_reqd) {
9604                                 if (auth == NULL) {
9605                                         m = sctp_add_auth_chunk(m,
9606                                             &endofchain,
9607                                             &auth,
9608                                             &auth_offset,
9609                                             stcb,
9610                                             SCTP_DATA);
9611                                         auth_keyid = chk->auth_keyid;
9612                                         override_ok = 0;
9613                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
9614                                 } else if (override_ok) {
9615                                         auth_keyid = chk->auth_keyid;
9616                                         override_ok = 0;
9617                                 } else if (chk->auth_keyid != auth_keyid) {
9618                                         /* different keyid, so done bundling */
9619                                         break;
9620                                 }
9621                         }
9622                         m = sctp_copy_mbufchain(chk->data, m, &endofchain, 0, chk->send_size, chk->copy_by_ref);
9623                         if (m == NULL) {
9624                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
9625                                 return (ENOMEM);
9626                         }
9627                         /* Do clear IP_DF ? */
9628                         if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
9629                                 no_fragmentflg = 0;
9630                         }
9631                         /* update our MTU size */
9632                         if (mtu > (chk->send_size + dmtu))
9633                                 mtu -= (chk->send_size + dmtu);
9634                         else
9635                                 mtu = 0;
9636                         data_list[bundle_at++] = chk;
9637                         if (one_chunk && (asoc->total_flight <= 0)) {
9638                                 SCTP_STAT_INCR(sctps_windowprobed);
9639                         }
9640                 }
9641                 if (one_chunk == 0) {
9642                         /*
9643                          * now are there anymore forward from chk to pick
9644                          * up?
9645                          */
9646                         for (fwd = TAILQ_NEXT(chk, sctp_next); fwd != NULL; fwd = TAILQ_NEXT(fwd, sctp_next)) {
9647                                 if (fwd->sent != SCTP_DATAGRAM_RESEND) {
9648                                         /* Nope, not for retran */
9649                                         continue;
9650                                 }
9651                                 if (fwd->whoTo != net) {
9652                                         /* Nope, not the net in question */
9653                                         continue;
9654                                 }
9655                                 if (data_auth_reqd && (auth == NULL)) {
9656                                         dmtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
9657                                 } else
9658                                         dmtu = 0;
9659                                 if (fwd->send_size <= (mtu - dmtu)) {
9660                                         if (data_auth_reqd) {
9661                                                 if (auth == NULL) {
9662                                                         m = sctp_add_auth_chunk(m,
9663                                                             &endofchain,
9664                                                             &auth,
9665                                                             &auth_offset,
9666                                                             stcb,
9667                                                             SCTP_DATA);
9668                                                         auth_keyid = fwd->auth_keyid;
9669                                                         override_ok = 0;
9670                                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
9671                                                 } else if (override_ok) {
9672                                                         auth_keyid = fwd->auth_keyid;
9673                                                         override_ok = 0;
9674                                                 } else if (fwd->auth_keyid != auth_keyid) {
9675                                                         /*
9676                                                          * different keyid,
9677                                                          * so done bundling
9678                                                          */
9679                                                         break;
9680                                                 }
9681                                         }
9682                                         m = sctp_copy_mbufchain(fwd->data, m, &endofchain, 0, fwd->send_size, fwd->copy_by_ref);
9683                                         if (m == NULL) {
9684                                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
9685                                                 return (ENOMEM);
9686                                         }
9687                                         /* Do clear IP_DF ? */
9688                                         if (fwd->flags & CHUNK_FLAGS_FRAGMENT_OK) {
9689                                                 no_fragmentflg = 0;
9690                                         }
9691                                         /* update our MTU size */
9692                                         if (mtu > (fwd->send_size + dmtu))
9693                                                 mtu -= (fwd->send_size + dmtu);
9694                                         else
9695                                                 mtu = 0;
9696                                         data_list[bundle_at++] = fwd;
9697                                         if (bundle_at >= SCTP_MAX_DATA_BUNDLING) {
9698                                                 break;
9699                                         }
9700                                 } else {
9701                                         /* can't fit so we are done */
9702                                         break;
9703                                 }
9704                         }
9705                 }
9706                 /* Is there something to send for this destination? */
9707                 if (m) {
9708                         /*
9709                          * No matter if we fail/or succeed we should start a
9710                          * timer. A failure is like a lost IP packet :-)
9711                          */
9712                         if (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
9713                                 /*
9714                                  * no timer running on this destination
9715                                  * restart it.
9716                                  */
9717                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
9718                                 tmr_started = 1;
9719                         }
9720                         /* Now lets send it, if there is anything to send :> */
9721                         if ((error = sctp_lowlevel_chunk_output(inp, stcb, net,
9722                             (struct sockaddr *)&net->ro._l_addr, m,
9723                             auth_offset, auth, auth_keyid,
9724                             no_fragmentflg, 0, 0,
9725                             inp->sctp_lport, stcb->rport, htonl(stcb->asoc.peer_vtag),
9726                             net->port, NULL,
9727                             0, 0,
9728                             so_locked))) {
9729                                 /* error, we could not output */
9730                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
9731                                 if (error == ENOBUFS) {
9732                                         asoc->ifp_had_enobuf = 1;
9733                                         SCTP_STAT_INCR(sctps_lowlevelerr);
9734                                 }
9735                                 return (error);
9736                         } else {
9737                                 asoc->ifp_had_enobuf = 0;
9738                         }
9739                         endofchain = NULL;
9740                         auth = NULL;
9741                         auth_offset = 0;
9742                         /* For HB's */
9743                         /*
9744                          * We don't want to mark the net->sent time here
9745                          * since this we use this for HB and retrans cannot
9746                          * measure RTT
9747                          */
9748                         /* (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time); */
9749
9750                         /* For auto-close */
9751                         if (*now_filled == 0) {
9752                                 (void)SCTP_GETTIME_TIMEVAL(&asoc->time_last_sent);
9753                                 *now = asoc->time_last_sent;
9754                                 *now_filled = 1;
9755                         } else {
9756                                 asoc->time_last_sent = *now;
9757                         }
9758                         *cnt_out += bundle_at;
9759 #ifdef SCTP_AUDITING_ENABLED
9760                         sctp_audit_log(0xC4, bundle_at);
9761 #endif
9762                         if (bundle_at) {
9763                                 tsns_sent = data_list[0]->rec.data.tsn;
9764                         }
9765                         for (i = 0; i < bundle_at; i++) {
9766                                 SCTP_STAT_INCR(sctps_sendretransdata);
9767                                 data_list[i]->sent = SCTP_DATAGRAM_SENT;
9768                                 /*
9769                                  * When we have a revoked data, and we
9770                                  * retransmit it, then we clear the revoked
9771                                  * flag since this flag dictates if we
9772                                  * subtracted from the fs
9773                                  */
9774                                 if (data_list[i]->rec.data.chunk_was_revoked) {
9775                                         /* Deflate the cwnd */
9776                                         data_list[i]->whoTo->cwnd -= data_list[i]->book_size;
9777                                         data_list[i]->rec.data.chunk_was_revoked = 0;
9778                                 }
9779                                 data_list[i]->snd_count++;
9780                                 sctp_ucount_decr(asoc->sent_queue_retran_cnt);
9781                                 /* record the time */
9782                                 data_list[i]->sent_rcv_time = asoc->time_last_sent;
9783                                 if (data_list[i]->book_size_scale) {
9784                                         /*
9785                                          * need to double the book size on
9786                                          * this one
9787                                          */
9788                                         data_list[i]->book_size_scale = 0;
9789                                         /*
9790                                          * Since we double the booksize, we
9791                                          * must also double the output queue
9792                                          * size, since this get shrunk when
9793                                          * we free by this amount.
9794                                          */
9795                                         atomic_add_int(&((asoc)->total_output_queue_size), data_list[i]->book_size);
9796                                         data_list[i]->book_size *= 2;
9797                                 } else {
9798                                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_RWND_ENABLE) {
9799                                                 sctp_log_rwnd(SCTP_DECREASE_PEER_RWND,
9800                                                     asoc->peers_rwnd, data_list[i]->send_size, SCTP_BASE_SYSCTL(sctp_peer_chunk_oh));
9801                                         }
9802                                         asoc->peers_rwnd = sctp_sbspace_sub(asoc->peers_rwnd,
9803                                             (uint32_t)(data_list[i]->send_size +
9804                                             SCTP_BASE_SYSCTL(sctp_peer_chunk_oh)));
9805                                 }
9806                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
9807                                         sctp_misc_ints(SCTP_FLIGHT_LOG_UP_RSND,
9808                                             data_list[i]->whoTo->flight_size,
9809                                             data_list[i]->book_size,
9810                                             (uint32_t)(uintptr_t)data_list[i]->whoTo,
9811                                             data_list[i]->rec.data.tsn);
9812                                 }
9813                                 sctp_flight_size_increase(data_list[i]);
9814                                 sctp_total_flight_increase(stcb, data_list[i]);
9815                                 if (asoc->peers_rwnd < stcb->sctp_ep->sctp_ep.sctp_sws_sender) {
9816                                         /* SWS sender side engages */
9817                                         asoc->peers_rwnd = 0;
9818                                 }
9819                                 if ((i == 0) &&
9820                                     (data_list[i]->rec.data.doing_fast_retransmit)) {
9821                                         SCTP_STAT_INCR(sctps_sendfastretrans);
9822                                         if ((data_list[i] == TAILQ_FIRST(&asoc->sent_queue)) &&
9823                                             (tmr_started == 0)) {
9824                                                 /*-
9825                                                  * ok we just fast-retrans'd
9826                                                  * the lowest TSN, i.e the
9827                                                  * first on the list. In
9828                                                  * this case we want to give
9829                                                  * some more time to get a
9830                                                  * SACK back without a
9831                                                  * t3-expiring.
9832                                                  */
9833                                                 sctp_timer_stop(SCTP_TIMER_TYPE_SEND, inp, stcb, net,
9834                                                     SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_2);
9835                                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
9836                                         }
9837                                 }
9838                         }
9839                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
9840                                 sctp_log_cwnd(stcb, net, tsns_sent, SCTP_CWND_LOG_FROM_RESEND);
9841                         }
9842 #ifdef SCTP_AUDITING_ENABLED
9843                         sctp_auditing(21, inp, stcb, NULL);
9844 #endif
9845                 } else {
9846                         /* None will fit */
9847                         return (1);
9848                 }
9849                 if (asoc->sent_queue_retran_cnt <= 0) {
9850                         /* all done we have no more to retran */
9851                         asoc->sent_queue_retran_cnt = 0;
9852                         break;
9853                 }
9854                 if (one_chunk) {
9855                         /* No more room in rwnd */
9856                         return (1);
9857                 }
9858                 /* stop the for loop here. we sent out a packet */
9859                 break;
9860         }
9861         return (0);
9862 }
9863
9864 static void
9865 sctp_timer_validation(struct sctp_inpcb *inp,
9866     struct sctp_tcb *stcb,
9867     struct sctp_association *asoc)
9868 {
9869         struct sctp_nets *net;
9870
9871         /* Validate that a timer is running somewhere */
9872         TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
9873                 if (SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
9874                         /* Here is a timer */
9875                         return;
9876                 }
9877         }
9878         SCTP_TCB_LOCK_ASSERT(stcb);
9879         /* Gak, we did not have a timer somewhere */
9880         SCTPDBG(SCTP_DEBUG_OUTPUT3, "Deadlock avoided starting timer on a dest at retran\n");
9881         if (asoc->alternate) {
9882                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, asoc->alternate);
9883         } else {
9884                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, asoc->primary_destination);
9885         }
9886         return;
9887 }
9888
9889 void
9890 sctp_chunk_output(struct sctp_inpcb *inp,
9891     struct sctp_tcb *stcb,
9892     int from_where,
9893     int so_locked)
9894 {
9895         /*-
9896          * Ok this is the generic chunk service queue. we must do the
9897          * following:
9898          * - See if there are retransmits pending, if so we must
9899          *   do these first.
9900          * - Service the stream queue that is next, moving any
9901          *   message (note I must get a complete message i.e.
9902          *   FIRST/MIDDLE and LAST to the out queue in one pass) and assigning
9903          *   TSN's
9904          * - Check to see if the cwnd/rwnd allows any output, if so we
9905          *   go ahead and formulate and send the low level chunks. Making sure
9906          *   to combine any control in the control chunk queue also.
9907          */
9908         struct sctp_association *asoc;
9909         struct sctp_nets *net;
9910         int error = 0, num_out, tot_out = 0, ret = 0, reason_code;
9911         unsigned int burst_cnt = 0;
9912         struct timeval now;
9913         int now_filled = 0;
9914         int nagle_on;
9915         uint32_t frag_point = sctp_get_frag_point(stcb);
9916         int un_sent = 0;
9917         int fr_done;
9918         unsigned int tot_frs = 0;
9919
9920         asoc = &stcb->asoc;
9921 do_it_again:
9922         /* The Nagle algorithm is only applied when handling a send call. */
9923         if (from_where == SCTP_OUTPUT_FROM_USR_SEND) {
9924                 if (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_NODELAY)) {
9925                         nagle_on = 0;
9926                 } else {
9927                         nagle_on = 1;
9928                 }
9929         } else {
9930                 nagle_on = 0;
9931         }
9932         SCTP_TCB_LOCK_ASSERT(stcb);
9933
9934         un_sent = (stcb->asoc.total_output_queue_size - stcb->asoc.total_flight);
9935
9936         if ((un_sent <= 0) &&
9937             (TAILQ_EMPTY(&asoc->control_send_queue)) &&
9938             (TAILQ_EMPTY(&asoc->asconf_send_queue)) &&
9939             (asoc->sent_queue_retran_cnt == 0) &&
9940             (asoc->trigger_reset == 0)) {
9941                 /* Nothing to do unless there is something to be sent left */
9942                 return;
9943         }
9944         /*
9945          * Do we have something to send, data or control AND a sack timer
9946          * running, if so piggy-back the sack.
9947          */
9948         if (SCTP_OS_TIMER_PENDING(&stcb->asoc.dack_timer.timer)) {
9949                 sctp_send_sack(stcb, so_locked);
9950                 sctp_timer_stop(SCTP_TIMER_TYPE_RECV, stcb->sctp_ep, stcb, NULL,
9951                     SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_3);
9952         }
9953         while (asoc->sent_queue_retran_cnt) {
9954                 /*-
9955                  * Ok, it is retransmission time only, we send out only ONE
9956                  * packet with a single call off to the retran code.
9957                  */
9958                 if (from_where == SCTP_OUTPUT_FROM_COOKIE_ACK) {
9959                         /*-
9960                          * Special hook for handling cookies discarded
9961                          * by peer that carried data. Send cookie-ack only
9962                          * and then the next call with get the retran's.
9963                          */
9964                         (void)sctp_med_chunk_output(inp, stcb, asoc, &num_out, &reason_code, 1,
9965                             from_where,
9966                             &now, &now_filled, frag_point, so_locked);
9967                         return;
9968                 } else if (from_where != SCTP_OUTPUT_FROM_HB_TMR) {
9969                         /* if its not from a HB then do it */
9970                         fr_done = 0;
9971                         ret = sctp_chunk_retransmission(inp, stcb, asoc, &num_out, &now, &now_filled, &fr_done, so_locked);
9972                         if (fr_done) {
9973                                 tot_frs++;
9974                         }
9975                 } else {
9976                         /*
9977                          * its from any other place, we don't allow retran
9978                          * output (only control)
9979                          */
9980                         ret = 1;
9981                 }
9982                 if (ret > 0) {
9983                         /* Can't send anymore */
9984                         /*-
9985                          * now lets push out control by calling med-level
9986                          * output once. this assures that we WILL send HB's
9987                          * if queued too.
9988                          */
9989                         (void)sctp_med_chunk_output(inp, stcb, asoc, &num_out, &reason_code, 1,
9990                             from_where,
9991                             &now, &now_filled, frag_point, so_locked);
9992 #ifdef SCTP_AUDITING_ENABLED
9993                         sctp_auditing(8, inp, stcb, NULL);
9994 #endif
9995                         sctp_timer_validation(inp, stcb, asoc);
9996                         return;
9997                 }
9998                 if (ret < 0) {
9999                         /*-
10000                          * The count was off.. retran is not happening so do
10001                          * the normal retransmission.
10002                          */
10003 #ifdef SCTP_AUDITING_ENABLED
10004                         sctp_auditing(9, inp, stcb, NULL);
10005 #endif
10006                         if (ret == SCTP_RETRAN_EXIT) {
10007                                 return;
10008                         }
10009                         break;
10010                 }
10011                 if (from_where == SCTP_OUTPUT_FROM_T3) {
10012                         /* Only one transmission allowed out of a timeout */
10013 #ifdef SCTP_AUDITING_ENABLED
10014                         sctp_auditing(10, inp, stcb, NULL);
10015 #endif
10016                         /* Push out any control */
10017                         (void)sctp_med_chunk_output(inp, stcb, asoc, &num_out, &reason_code, 1, from_where,
10018                             &now, &now_filled, frag_point, so_locked);
10019                         return;
10020                 }
10021                 if ((asoc->fr_max_burst > 0) && (tot_frs >= asoc->fr_max_burst)) {
10022                         /* Hit FR burst limit */
10023                         return;
10024                 }
10025                 if ((num_out == 0) && (ret == 0)) {
10026                         /* No more retrans to send */
10027                         break;
10028                 }
10029         }
10030 #ifdef SCTP_AUDITING_ENABLED
10031         sctp_auditing(12, inp, stcb, NULL);
10032 #endif
10033         /* Check for bad destinations, if they exist move chunks around. */
10034         TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
10035                 if ((net->dest_state & SCTP_ADDR_REACHABLE) == 0) {
10036                         /*-
10037                          * if possible move things off of this address we
10038                          * still may send below due to the dormant state but
10039                          * we try to find an alternate address to send to
10040                          * and if we have one we move all queued data on the
10041                          * out wheel to this alternate address.
10042                          */
10043                         if (net->ref_count > 1)
10044                                 sctp_move_chunks_from_net(stcb, net);
10045                 } else {
10046                         /*-
10047                          * if ((asoc->sat_network) || (net->addr_is_local))
10048                          * { burst_limit = asoc->max_burst *
10049                          * SCTP_SAT_NETWORK_BURST_INCR; }
10050                          */
10051                         if (asoc->max_burst > 0) {
10052                                 if (SCTP_BASE_SYSCTL(sctp_use_cwnd_based_maxburst)) {
10053                                         if ((net->flight_size + (asoc->max_burst * net->mtu)) < net->cwnd) {
10054                                                 /*
10055                                                  * JRS - Use the congestion
10056                                                  * control given in the
10057                                                  * congestion control module
10058                                                  */
10059                                                 asoc->cc_functions.sctp_cwnd_update_after_output(stcb, net, asoc->max_burst);
10060                                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_MAXBURST_ENABLE) {
10061                                                         sctp_log_maxburst(stcb, net, 0, asoc->max_burst, SCTP_MAX_BURST_APPLIED);
10062                                                 }
10063                                                 SCTP_STAT_INCR(sctps_maxburstqueued);
10064                                         }
10065                                         net->fast_retran_ip = 0;
10066                                 } else {
10067                                         if (net->flight_size == 0) {
10068                                                 /*
10069                                                  * Should be decaying the
10070                                                  * cwnd here
10071                                                  */
10072                                                 ;
10073                                         }
10074                                 }
10075                         }
10076                 }
10077         }
10078         burst_cnt = 0;
10079         do {
10080                 error = sctp_med_chunk_output(inp, stcb, asoc, &num_out,
10081                     &reason_code, 0, from_where,
10082                     &now, &now_filled, frag_point, so_locked);
10083                 if (error) {
10084                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Error %d was returned from med-c-op\n", error);
10085                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_MAXBURST_ENABLE) {
10086                                 sctp_log_maxburst(stcb, asoc->primary_destination, error, burst_cnt, SCTP_MAX_BURST_ERROR_STOP);
10087                         }
10088                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
10089                                 sctp_log_cwnd(stcb, NULL, error, SCTP_SEND_NOW_COMPLETES);
10090                                 sctp_log_cwnd(stcb, NULL, 0xdeadbeef, SCTP_SEND_NOW_COMPLETES);
10091                         }
10092                         break;
10093                 }
10094                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "m-c-o put out %d\n", num_out);
10095
10096                 tot_out += num_out;
10097                 burst_cnt++;
10098                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
10099                         sctp_log_cwnd(stcb, NULL, num_out, SCTP_SEND_NOW_COMPLETES);
10100                         if (num_out == 0) {
10101                                 sctp_log_cwnd(stcb, NULL, reason_code, SCTP_SEND_NOW_COMPLETES);
10102                         }
10103                 }
10104                 if (nagle_on) {
10105                         /*
10106                          * When the Nagle algorithm is used, look at how
10107                          * much is unsent, then if its smaller than an MTU
10108                          * and we have data in flight we stop, except if we
10109                          * are handling a fragmented user message.
10110                          */
10111                         un_sent = stcb->asoc.total_output_queue_size - stcb->asoc.total_flight;
10112                         if ((un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD)) &&
10113                             (stcb->asoc.total_flight > 0)) {
10114 /*      &&                   sctp_is_feature_on(inp, SCTP_PCB_FLAGS_EXPLICIT_EOR))) {*/
10115                                 break;
10116                         }
10117                 }
10118                 if (TAILQ_EMPTY(&asoc->control_send_queue) &&
10119                     TAILQ_EMPTY(&asoc->send_queue) &&
10120                     sctp_is_there_unsent_data(stcb, so_locked) == 0) {
10121                         /* Nothing left to send */
10122                         break;
10123                 }
10124                 if ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) <= 0) {
10125                         /* Nothing left to send */
10126                         break;
10127                 }
10128         } while (num_out &&
10129             ((asoc->max_burst == 0) ||
10130             SCTP_BASE_SYSCTL(sctp_use_cwnd_based_maxburst) ||
10131             (burst_cnt < asoc->max_burst)));
10132
10133         if (SCTP_BASE_SYSCTL(sctp_use_cwnd_based_maxburst) == 0) {
10134                 if ((asoc->max_burst > 0) && (burst_cnt >= asoc->max_burst)) {
10135                         SCTP_STAT_INCR(sctps_maxburstqueued);
10136                         asoc->burst_limit_applied = 1;
10137                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_MAXBURST_ENABLE) {
10138                                 sctp_log_maxburst(stcb, asoc->primary_destination, 0, burst_cnt, SCTP_MAX_BURST_APPLIED);
10139                         }
10140                 } else {
10141                         asoc->burst_limit_applied = 0;
10142                 }
10143         }
10144         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
10145                 sctp_log_cwnd(stcb, NULL, tot_out, SCTP_SEND_NOW_COMPLETES);
10146         }
10147         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Ok, we have put out %d chunks\n",
10148             tot_out);
10149
10150         /*-
10151          * Now we need to clean up the control chunk chain if a ECNE is on
10152          * it. It must be marked as UNSENT again so next call will continue
10153          * to send it until such time that we get a CWR, to remove it.
10154          */
10155         if (stcb->asoc.ecn_echo_cnt_onq)
10156                 sctp_fix_ecn_echo(asoc);
10157
10158         if (stcb->asoc.trigger_reset) {
10159                 if (sctp_send_stream_reset_out_if_possible(stcb, so_locked) == 0) {
10160                         goto do_it_again;
10161                 }
10162         }
10163         return;
10164 }
10165
10166 int
10167 sctp_output(
10168     struct sctp_inpcb *inp,
10169     struct mbuf *m,
10170     struct sockaddr *addr,
10171     struct mbuf *control,
10172     struct thread *p,
10173     int flags)
10174 {
10175         if (inp == NULL) {
10176                 SCTP_LTRACE_ERR_RET_PKT(m, inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
10177                 return (EINVAL);
10178         }
10179
10180         if (inp->sctp_socket == NULL) {
10181                 SCTP_LTRACE_ERR_RET_PKT(m, inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
10182                 return (EINVAL);
10183         }
10184         return (sctp_sosend(inp->sctp_socket,
10185             addr,
10186             (struct uio *)NULL,
10187             m,
10188             control,
10189             flags, p
10190             ));
10191 }
10192
10193 void
10194 send_forward_tsn(struct sctp_tcb *stcb,
10195     struct sctp_association *asoc)
10196 {
10197         struct sctp_tmit_chunk *chk, *at, *tp1, *last;
10198         struct sctp_forward_tsn_chunk *fwdtsn;
10199         struct sctp_strseq *strseq;
10200         struct sctp_strseq_mid *strseq_m;
10201         uint32_t advance_peer_ack_point;
10202         unsigned int cnt_of_space, i, ovh;
10203         unsigned int space_needed;
10204         unsigned int cnt_of_skipped = 0;
10205
10206         SCTP_TCB_LOCK_ASSERT(stcb);
10207         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
10208                 if (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN) {
10209                         /* mark it to unsent */
10210                         chk->sent = SCTP_DATAGRAM_UNSENT;
10211                         chk->snd_count = 0;
10212                         /* Do we correct its output location? */
10213                         if (chk->whoTo) {
10214                                 sctp_free_remote_addr(chk->whoTo);
10215                                 chk->whoTo = NULL;
10216                         }
10217                         goto sctp_fill_in_rest;
10218                 }
10219         }
10220         /* Ok if we reach here we must build one */
10221         sctp_alloc_a_chunk(stcb, chk);
10222         if (chk == NULL) {
10223                 return;
10224         }
10225         asoc->fwd_tsn_cnt++;
10226         chk->copy_by_ref = 0;
10227         /*
10228          * We don't do the old thing here since this is used not for on-wire
10229          * but to tell if we are sending a fwd-tsn by the stack during
10230          * output. And if its a IFORWARD or a FORWARD it is a fwd-tsn.
10231          */
10232         chk->rec.chunk_id.id = SCTP_FORWARD_CUM_TSN;
10233         chk->rec.chunk_id.can_take_data = 0;
10234         chk->flags = 0;
10235         chk->asoc = asoc;
10236         chk->whoTo = NULL;
10237         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
10238         if (chk->data == NULL) {
10239                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
10240                 return;
10241         }
10242         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
10243         chk->sent = SCTP_DATAGRAM_UNSENT;
10244         chk->snd_count = 0;
10245         TAILQ_INSERT_TAIL(&asoc->control_send_queue, chk, sctp_next);
10246         asoc->ctrl_queue_cnt++;
10247 sctp_fill_in_rest:
10248         /*-
10249          * Here we go through and fill out the part that deals with
10250          * stream/seq of the ones we skip.
10251          */
10252         SCTP_BUF_LEN(chk->data) = 0;
10253         TAILQ_FOREACH(at, &asoc->sent_queue, sctp_next) {
10254                 if ((at->sent != SCTP_FORWARD_TSN_SKIP) &&
10255                     (at->sent != SCTP_DATAGRAM_NR_ACKED)) {
10256                         /* no more to look at */
10257                         break;
10258                 }
10259                 if (!asoc->idata_supported && (at->rec.data.rcv_flags & SCTP_DATA_UNORDERED)) {
10260                         /* We don't report these */
10261                         continue;
10262                 }
10263                 cnt_of_skipped++;
10264         }
10265         if (asoc->idata_supported) {
10266                 space_needed = (sizeof(struct sctp_forward_tsn_chunk) +
10267                     (cnt_of_skipped * sizeof(struct sctp_strseq_mid)));
10268         } else {
10269                 space_needed = (sizeof(struct sctp_forward_tsn_chunk) +
10270                     (cnt_of_skipped * sizeof(struct sctp_strseq)));
10271         }
10272         cnt_of_space = (unsigned int)M_TRAILINGSPACE(chk->data);
10273
10274         if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
10275                 ovh = SCTP_MIN_OVERHEAD;
10276         } else {
10277                 ovh = SCTP_MIN_V4_OVERHEAD;
10278         }
10279         if (cnt_of_space > (asoc->smallest_mtu - ovh)) {
10280                 /* trim to a mtu size */
10281                 cnt_of_space = asoc->smallest_mtu - ovh;
10282         }
10283         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_TRY_ADVANCE) {
10284                 sctp_misc_ints(SCTP_FWD_TSN_CHECK,
10285                     0xff, 0, cnt_of_skipped,
10286                     asoc->advanced_peer_ack_point);
10287         }
10288         advance_peer_ack_point = asoc->advanced_peer_ack_point;
10289         if (cnt_of_space < space_needed) {
10290                 /*-
10291                  * ok we must trim down the chunk by lowering the
10292                  * advance peer ack point.
10293                  */
10294                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_TRY_ADVANCE) {
10295                         sctp_misc_ints(SCTP_FWD_TSN_CHECK,
10296                             0xff, 0xff, cnt_of_space,
10297                             space_needed);
10298                 }
10299                 cnt_of_skipped = cnt_of_space - sizeof(struct sctp_forward_tsn_chunk);
10300                 if (asoc->idata_supported) {
10301                         cnt_of_skipped /= sizeof(struct sctp_strseq_mid);
10302                 } else {
10303                         cnt_of_skipped /= sizeof(struct sctp_strseq);
10304                 }
10305                 /*-
10306                  * Go through and find the TSN that will be the one
10307                  * we report.
10308                  */
10309                 at = TAILQ_FIRST(&asoc->sent_queue);
10310                 if (at != NULL) {
10311                         for (i = 0; i < cnt_of_skipped; i++) {
10312                                 tp1 = TAILQ_NEXT(at, sctp_next);
10313                                 if (tp1 == NULL) {
10314                                         break;
10315                                 }
10316                                 at = tp1;
10317                         }
10318                 }
10319                 if (at && SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_TRY_ADVANCE) {
10320                         sctp_misc_ints(SCTP_FWD_TSN_CHECK,
10321                             0xff, cnt_of_skipped, at->rec.data.tsn,
10322                             asoc->advanced_peer_ack_point);
10323                 }
10324                 last = at;
10325                 /*-
10326                  * last now points to last one I can report, update
10327                  * peer ack point
10328                  */
10329                 if (last) {
10330                         advance_peer_ack_point = last->rec.data.tsn;
10331                 }
10332                 if (asoc->idata_supported) {
10333                         space_needed = sizeof(struct sctp_forward_tsn_chunk) +
10334                             cnt_of_skipped * sizeof(struct sctp_strseq_mid);
10335                 } else {
10336                         space_needed = sizeof(struct sctp_forward_tsn_chunk) +
10337                             cnt_of_skipped * sizeof(struct sctp_strseq);
10338                 }
10339         }
10340         chk->send_size = space_needed;
10341         /* Setup the chunk */
10342         fwdtsn = mtod(chk->data, struct sctp_forward_tsn_chunk *);
10343         fwdtsn->ch.chunk_length = htons(chk->send_size);
10344         fwdtsn->ch.chunk_flags = 0;
10345         if (asoc->idata_supported) {
10346                 fwdtsn->ch.chunk_type = SCTP_IFORWARD_CUM_TSN;
10347         } else {
10348                 fwdtsn->ch.chunk_type = SCTP_FORWARD_CUM_TSN;
10349         }
10350         fwdtsn->new_cumulative_tsn = htonl(advance_peer_ack_point);
10351         SCTP_BUF_LEN(chk->data) = chk->send_size;
10352         fwdtsn++;
10353         /*-
10354          * Move pointer to after the fwdtsn and transfer to the
10355          * strseq pointer.
10356          */
10357         if (asoc->idata_supported) {
10358                 strseq_m = (struct sctp_strseq_mid *)fwdtsn;
10359                 strseq = NULL;
10360         } else {
10361                 strseq = (struct sctp_strseq *)fwdtsn;
10362                 strseq_m = NULL;
10363         }
10364         /*-
10365          * Now populate the strseq list. This is done blindly
10366          * without pulling out duplicate stream info. This is
10367          * inefficient but won't harm the process since the peer will
10368          * look at these in sequence and will thus release anything.
10369          * It could mean we exceed the PMTU and chop off some that
10370          * we could have included.. but this is unlikely (aka 1432/4
10371          * would mean 300+ stream seq's would have to be reported in
10372          * one FWD-TSN. With a bit of work we can later FIX this to
10373          * optimize and pull out duplicates.. but it does add more
10374          * overhead. So for now... not!
10375          */
10376         i = 0;
10377         TAILQ_FOREACH(at, &asoc->sent_queue, sctp_next) {
10378                 if (i >= cnt_of_skipped) {
10379                         break;
10380                 }
10381                 if (!asoc->idata_supported && (at->rec.data.rcv_flags & SCTP_DATA_UNORDERED)) {
10382                         /* We don't report these */
10383                         continue;
10384                 }
10385                 if (at->rec.data.tsn == advance_peer_ack_point) {
10386                         at->rec.data.fwd_tsn_cnt = 0;
10387                 }
10388                 if (asoc->idata_supported) {
10389                         strseq_m->sid = htons(at->rec.data.sid);
10390                         if (at->rec.data.rcv_flags & SCTP_DATA_UNORDERED) {
10391                                 strseq_m->flags = htons(PR_SCTP_UNORDERED_FLAG);
10392                         } else {
10393                                 strseq_m->flags = 0;
10394                         }
10395                         strseq_m->mid = htonl(at->rec.data.mid);
10396                         strseq_m++;
10397                 } else {
10398                         strseq->sid = htons(at->rec.data.sid);
10399                         strseq->ssn = htons((uint16_t)at->rec.data.mid);
10400                         strseq++;
10401                 }
10402                 i++;
10403         }
10404         return;
10405 }
10406
10407 void
10408 sctp_send_sack(struct sctp_tcb *stcb, int so_locked)
10409 {
10410         /*-
10411          * Queue up a SACK or NR-SACK in the control queue.
10412          * We must first check to see if a SACK or NR-SACK is
10413          * somehow on the control queue.
10414          * If so, we will take and and remove the old one.
10415          */
10416         struct sctp_association *asoc;
10417         struct sctp_tmit_chunk *chk, *a_chk;
10418         struct sctp_sack_chunk *sack;
10419         struct sctp_nr_sack_chunk *nr_sack;
10420         struct sctp_gap_ack_block *gap_descriptor;
10421         const struct sack_track *selector;
10422         int mergeable = 0;
10423         int offset;
10424         caddr_t limit;
10425         uint32_t *dup;
10426         int limit_reached = 0;
10427         unsigned int i, siz, j;
10428         unsigned int num_gap_blocks = 0, num_nr_gap_blocks = 0, space;
10429         int num_dups = 0;
10430         int space_req;
10431         uint32_t highest_tsn;
10432         uint8_t flags;
10433         uint8_t type;
10434         uint8_t tsn_map;
10435
10436         if (stcb->asoc.nrsack_supported == 1) {
10437                 type = SCTP_NR_SELECTIVE_ACK;
10438         } else {
10439                 type = SCTP_SELECTIVE_ACK;
10440         }
10441         a_chk = NULL;
10442         asoc = &stcb->asoc;
10443         SCTP_TCB_LOCK_ASSERT(stcb);
10444         if (asoc->last_data_chunk_from == NULL) {
10445                 /* Hmm we never received anything */
10446                 return;
10447         }
10448         sctp_slide_mapping_arrays(stcb);
10449         sctp_set_rwnd(stcb, asoc);
10450         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
10451                 if (chk->rec.chunk_id.id == type) {
10452                         /* Hmm, found a sack already on queue, remove it */
10453                         TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
10454                         asoc->ctrl_queue_cnt--;
10455                         a_chk = chk;
10456                         if (a_chk->data) {
10457                                 sctp_m_freem(a_chk->data);
10458                                 a_chk->data = NULL;
10459                         }
10460                         if (a_chk->whoTo) {
10461                                 sctp_free_remote_addr(a_chk->whoTo);
10462                                 a_chk->whoTo = NULL;
10463                         }
10464                         break;
10465                 }
10466         }
10467         if (a_chk == NULL) {
10468                 sctp_alloc_a_chunk(stcb, a_chk);
10469                 if (a_chk == NULL) {
10470                         /* No memory so we drop the idea, and set a timer */
10471                         if (stcb->asoc.delayed_ack) {
10472                                 sctp_timer_stop(SCTP_TIMER_TYPE_RECV,
10473                                     stcb->sctp_ep, stcb, NULL,
10474                                     SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_4);
10475                                 sctp_timer_start(SCTP_TIMER_TYPE_RECV,
10476                                     stcb->sctp_ep, stcb, NULL);
10477                         } else {
10478                                 stcb->asoc.send_sack = 1;
10479                         }
10480                         return;
10481                 }
10482                 a_chk->copy_by_ref = 0;
10483                 a_chk->rec.chunk_id.id = type;
10484                 a_chk->rec.chunk_id.can_take_data = 1;
10485         }
10486         /* Clear our pkt counts */
10487         asoc->data_pkts_seen = 0;
10488
10489         a_chk->flags = 0;
10490         a_chk->asoc = asoc;
10491         a_chk->snd_count = 0;
10492         a_chk->send_size = 0;   /* fill in later */
10493         a_chk->sent = SCTP_DATAGRAM_UNSENT;
10494         a_chk->whoTo = NULL;
10495
10496         if ((asoc->last_data_chunk_from->dest_state & SCTP_ADDR_REACHABLE) == 0) {
10497                 /*-
10498                  * Ok, the destination for the SACK is unreachable, lets see if
10499                  * we can select an alternate to asoc->last_data_chunk_from
10500                  */
10501                 a_chk->whoTo = sctp_find_alternate_net(stcb, asoc->last_data_chunk_from, 0);
10502                 if (a_chk->whoTo == NULL) {
10503                         /* Nope, no alternate */
10504                         a_chk->whoTo = asoc->last_data_chunk_from;
10505                 }
10506         } else {
10507                 a_chk->whoTo = asoc->last_data_chunk_from;
10508         }
10509         if (a_chk->whoTo) {
10510                 atomic_add_int(&a_chk->whoTo->ref_count, 1);
10511         }
10512         if (SCTP_TSN_GT(asoc->highest_tsn_inside_map, asoc->highest_tsn_inside_nr_map)) {
10513                 highest_tsn = asoc->highest_tsn_inside_map;
10514         } else {
10515                 highest_tsn = asoc->highest_tsn_inside_nr_map;
10516         }
10517         if (highest_tsn == asoc->cumulative_tsn) {
10518                 /* no gaps */
10519                 if (type == SCTP_SELECTIVE_ACK) {
10520                         space_req = sizeof(struct sctp_sack_chunk);
10521                 } else {
10522                         space_req = sizeof(struct sctp_nr_sack_chunk);
10523                 }
10524         } else {
10525                 /* gaps get a cluster */
10526                 space_req = MCLBYTES;
10527         }
10528         /* Ok now lets formulate a MBUF with our sack */
10529         a_chk->data = sctp_get_mbuf_for_msg(space_req, 0, M_NOWAIT, 1, MT_DATA);
10530         if ((a_chk->data == NULL) ||
10531             (a_chk->whoTo == NULL)) {
10532                 /* rats, no mbuf memory */
10533                 if (a_chk->data) {
10534                         /* was a problem with the destination */
10535                         sctp_m_freem(a_chk->data);
10536                         a_chk->data = NULL;
10537                 }
10538                 sctp_free_a_chunk(stcb, a_chk, so_locked);
10539                 /* sa_ignore NO_NULL_CHK */
10540                 if (stcb->asoc.delayed_ack) {
10541                         sctp_timer_stop(SCTP_TIMER_TYPE_RECV,
10542                             stcb->sctp_ep, stcb, NULL,
10543                             SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_5);
10544                         sctp_timer_start(SCTP_TIMER_TYPE_RECV,
10545                             stcb->sctp_ep, stcb, NULL);
10546                 } else {
10547                         stcb->asoc.send_sack = 1;
10548                 }
10549                 return;
10550         }
10551         /* ok, lets go through and fill it in */
10552         SCTP_BUF_RESV_UF(a_chk->data, SCTP_MIN_OVERHEAD);
10553         space = (unsigned int)M_TRAILINGSPACE(a_chk->data);
10554         if (space > (a_chk->whoTo->mtu - SCTP_MIN_OVERHEAD)) {
10555                 space = (a_chk->whoTo->mtu - SCTP_MIN_OVERHEAD);
10556         }
10557         limit = mtod(a_chk->data, caddr_t);
10558         limit += space;
10559
10560         flags = 0;
10561
10562         if ((asoc->sctp_cmt_on_off > 0) &&
10563             SCTP_BASE_SYSCTL(sctp_cmt_use_dac)) {
10564                 /*-
10565                  * CMT DAC algorithm: If 2 (i.e., 0x10) packets have been
10566                  * received, then set high bit to 1, else 0. Reset
10567                  * pkts_rcvd.
10568                  */
10569                 flags |= (asoc->cmt_dac_pkts_rcvd << 6);
10570                 asoc->cmt_dac_pkts_rcvd = 0;
10571         }
10572 #ifdef SCTP_ASOCLOG_OF_TSNS
10573         stcb->asoc.cumack_logsnt[stcb->asoc.cumack_log_atsnt] = asoc->cumulative_tsn;
10574         stcb->asoc.cumack_log_atsnt++;
10575         if (stcb->asoc.cumack_log_atsnt >= SCTP_TSN_LOG_SIZE) {
10576                 stcb->asoc.cumack_log_atsnt = 0;
10577         }
10578 #endif
10579         /* reset the readers interpretation */
10580         stcb->freed_by_sorcv_sincelast = 0;
10581
10582         if (type == SCTP_SELECTIVE_ACK) {
10583                 sack = mtod(a_chk->data, struct sctp_sack_chunk *);
10584                 nr_sack = NULL;
10585                 gap_descriptor = (struct sctp_gap_ack_block *)((caddr_t)sack + sizeof(struct sctp_sack_chunk));
10586                 if (highest_tsn > asoc->mapping_array_base_tsn) {
10587                         siz = (((highest_tsn - asoc->mapping_array_base_tsn) + 1) + 7) / 8;
10588                 } else {
10589                         siz = (((MAX_TSN - asoc->mapping_array_base_tsn) + 1) + highest_tsn + 7) / 8;
10590                 }
10591         } else {
10592                 sack = NULL;
10593                 nr_sack = mtod(a_chk->data, struct sctp_nr_sack_chunk *);
10594                 gap_descriptor = (struct sctp_gap_ack_block *)((caddr_t)nr_sack + sizeof(struct sctp_nr_sack_chunk));
10595                 if (asoc->highest_tsn_inside_map > asoc->mapping_array_base_tsn) {
10596                         siz = (((asoc->highest_tsn_inside_map - asoc->mapping_array_base_tsn) + 1) + 7) / 8;
10597                 } else {
10598                         siz = (((MAX_TSN - asoc->mapping_array_base_tsn) + 1) + asoc->highest_tsn_inside_map + 7) / 8;
10599                 }
10600         }
10601
10602         if (SCTP_TSN_GT(asoc->mapping_array_base_tsn, asoc->cumulative_tsn)) {
10603                 offset = 1;
10604         } else {
10605                 offset = asoc->mapping_array_base_tsn - asoc->cumulative_tsn;
10606         }
10607         if (((type == SCTP_SELECTIVE_ACK) &&
10608             SCTP_TSN_GT(highest_tsn, asoc->cumulative_tsn)) ||
10609             ((type == SCTP_NR_SELECTIVE_ACK) &&
10610             SCTP_TSN_GT(asoc->highest_tsn_inside_map, asoc->cumulative_tsn))) {
10611                 /* we have a gap .. maybe */
10612                 for (i = 0; i < siz; i++) {
10613                         tsn_map = asoc->mapping_array[i];
10614                         if (type == SCTP_SELECTIVE_ACK) {
10615                                 tsn_map |= asoc->nr_mapping_array[i];
10616                         }
10617                         if (i == 0) {
10618                                 /*
10619                                  * Clear all bits corresponding to TSNs
10620                                  * smaller or equal to the cumulative TSN.
10621                                  */
10622                                 tsn_map &= (~0U << (1 - offset));
10623                         }
10624                         selector = &sack_array[tsn_map];
10625                         if (mergeable && selector->right_edge) {
10626                                 /*
10627                                  * Backup, left and right edges were ok to
10628                                  * merge.
10629                                  */
10630                                 num_gap_blocks--;
10631                                 gap_descriptor--;
10632                         }
10633                         if (selector->num_entries == 0)
10634                                 mergeable = 0;
10635                         else {
10636                                 for (j = 0; j < selector->num_entries; j++) {
10637                                         if (mergeable && selector->right_edge) {
10638                                                 /*
10639                                                  * do a merge by NOT setting
10640                                                  * the left side
10641                                                  */
10642                                                 mergeable = 0;
10643                                         } else {
10644                                                 /*
10645                                                  * no merge, set the left
10646                                                  * side
10647                                                  */
10648                                                 mergeable = 0;
10649                                                 gap_descriptor->start = htons((selector->gaps[j].start + offset));
10650                                         }
10651                                         gap_descriptor->end = htons((selector->gaps[j].end + offset));
10652                                         num_gap_blocks++;
10653                                         gap_descriptor++;
10654                                         if (((caddr_t)gap_descriptor + sizeof(struct sctp_gap_ack_block)) > limit) {
10655                                                 /* no more room */
10656                                                 limit_reached = 1;
10657                                                 break;
10658                                         }
10659                                 }
10660                                 if (selector->left_edge) {
10661                                         mergeable = 1;
10662                                 }
10663                         }
10664                         if (limit_reached) {
10665                                 /* Reached the limit stop */
10666                                 break;
10667                         }
10668                         offset += 8;
10669                 }
10670         }
10671         if ((type == SCTP_NR_SELECTIVE_ACK) &&
10672             (limit_reached == 0)) {
10673                 mergeable = 0;
10674
10675                 if (asoc->highest_tsn_inside_nr_map > asoc->mapping_array_base_tsn) {
10676                         siz = (((asoc->highest_tsn_inside_nr_map - asoc->mapping_array_base_tsn) + 1) + 7) / 8;
10677                 } else {
10678                         siz = (((MAX_TSN - asoc->mapping_array_base_tsn) + 1) + asoc->highest_tsn_inside_nr_map + 7) / 8;
10679                 }
10680
10681                 if (SCTP_TSN_GT(asoc->mapping_array_base_tsn, asoc->cumulative_tsn)) {
10682                         offset = 1;
10683                 } else {
10684                         offset = asoc->mapping_array_base_tsn - asoc->cumulative_tsn;
10685                 }
10686                 if (SCTP_TSN_GT(asoc->highest_tsn_inside_nr_map, asoc->cumulative_tsn)) {
10687                         /* we have a gap .. maybe */
10688                         for (i = 0; i < siz; i++) {
10689                                 tsn_map = asoc->nr_mapping_array[i];
10690                                 if (i == 0) {
10691                                         /*
10692                                          * Clear all bits corresponding to
10693                                          * TSNs smaller or equal to the
10694                                          * cumulative TSN.
10695                                          */
10696                                         tsn_map &= (~0U << (1 - offset));
10697                                 }
10698                                 selector = &sack_array[tsn_map];
10699                                 if (mergeable && selector->right_edge) {
10700                                         /*
10701                                          * Backup, left and right edges were
10702                                          * ok to merge.
10703                                          */
10704                                         num_nr_gap_blocks--;
10705                                         gap_descriptor--;
10706                                 }
10707                                 if (selector->num_entries == 0)
10708                                         mergeable = 0;
10709                                 else {
10710                                         for (j = 0; j < selector->num_entries; j++) {
10711                                                 if (mergeable && selector->right_edge) {
10712                                                         /*
10713                                                          * do a merge by NOT
10714                                                          * setting the left
10715                                                          * side
10716                                                          */
10717                                                         mergeable = 0;
10718                                                 } else {
10719                                                         /*
10720                                                          * no merge, set the
10721                                                          * left side
10722                                                          */
10723                                                         mergeable = 0;
10724                                                         gap_descriptor->start = htons((selector->gaps[j].start + offset));
10725                                                 }
10726                                                 gap_descriptor->end = htons((selector->gaps[j].end + offset));
10727                                                 num_nr_gap_blocks++;
10728                                                 gap_descriptor++;
10729                                                 if (((caddr_t)gap_descriptor + sizeof(struct sctp_gap_ack_block)) > limit) {
10730                                                         /* no more room */
10731                                                         limit_reached = 1;
10732                                                         break;
10733                                                 }
10734                                         }
10735                                         if (selector->left_edge) {
10736                                                 mergeable = 1;
10737                                         }
10738                                 }
10739                                 if (limit_reached) {
10740                                         /* Reached the limit stop */
10741                                         break;
10742                                 }
10743                                 offset += 8;
10744                         }
10745                 }
10746         }
10747         /* now we must add any dups we are going to report. */
10748         if ((limit_reached == 0) && (asoc->numduptsns)) {
10749                 dup = (uint32_t *)gap_descriptor;
10750                 for (i = 0; i < asoc->numduptsns; i++) {
10751                         *dup = htonl(asoc->dup_tsns[i]);
10752                         dup++;
10753                         num_dups++;
10754                         if (((caddr_t)dup + sizeof(uint32_t)) > limit) {
10755                                 /* no more room */
10756                                 break;
10757                         }
10758                 }
10759                 asoc->numduptsns = 0;
10760         }
10761         /*
10762          * now that the chunk is prepared queue it to the control chunk
10763          * queue.
10764          */
10765         if (type == SCTP_SELECTIVE_ACK) {
10766                 a_chk->send_size = (uint16_t)(sizeof(struct sctp_sack_chunk) +
10767                     (num_gap_blocks + num_nr_gap_blocks) * sizeof(struct sctp_gap_ack_block) +
10768                     num_dups * sizeof(int32_t));
10769                 SCTP_BUF_LEN(a_chk->data) = a_chk->send_size;
10770                 sack->sack.cum_tsn_ack = htonl(asoc->cumulative_tsn);
10771                 sack->sack.a_rwnd = htonl(asoc->my_rwnd);
10772                 sack->sack.num_gap_ack_blks = htons(num_gap_blocks);
10773                 sack->sack.num_dup_tsns = htons(num_dups);
10774                 sack->ch.chunk_type = type;
10775                 sack->ch.chunk_flags = flags;
10776                 sack->ch.chunk_length = htons(a_chk->send_size);
10777         } else {
10778                 a_chk->send_size = (uint16_t)(sizeof(struct sctp_nr_sack_chunk) +
10779                     (num_gap_blocks + num_nr_gap_blocks) * sizeof(struct sctp_gap_ack_block) +
10780                     num_dups * sizeof(int32_t));
10781                 SCTP_BUF_LEN(a_chk->data) = a_chk->send_size;
10782                 nr_sack->nr_sack.cum_tsn_ack = htonl(asoc->cumulative_tsn);
10783                 nr_sack->nr_sack.a_rwnd = htonl(asoc->my_rwnd);
10784                 nr_sack->nr_sack.num_gap_ack_blks = htons(num_gap_blocks);
10785                 nr_sack->nr_sack.num_nr_gap_ack_blks = htons(num_nr_gap_blocks);
10786                 nr_sack->nr_sack.num_dup_tsns = htons(num_dups);
10787                 nr_sack->nr_sack.reserved = 0;
10788                 nr_sack->ch.chunk_type = type;
10789                 nr_sack->ch.chunk_flags = flags;
10790                 nr_sack->ch.chunk_length = htons(a_chk->send_size);
10791         }
10792         TAILQ_INSERT_TAIL(&asoc->control_send_queue, a_chk, sctp_next);
10793         asoc->my_last_reported_rwnd = asoc->my_rwnd;
10794         asoc->ctrl_queue_cnt++;
10795         asoc->send_sack = 0;
10796         SCTP_STAT_INCR(sctps_sendsacks);
10797         return;
10798 }
10799
10800 void
10801 sctp_send_abort_tcb(struct sctp_tcb *stcb, struct mbuf *operr, int so_locked)
10802 {
10803         struct mbuf *m_abort, *m, *m_last;
10804         struct mbuf *m_out, *m_end = NULL;
10805         struct sctp_abort_chunk *abort;
10806         struct sctp_auth_chunk *auth = NULL;
10807         struct sctp_nets *net;
10808         uint32_t vtag;
10809         uint32_t auth_offset = 0;
10810         int error;
10811         uint16_t cause_len, chunk_len, padding_len;
10812
10813         SCTP_TCB_LOCK_ASSERT(stcb);
10814         /*-
10815          * Add an AUTH chunk, if chunk requires it and save the offset into
10816          * the chain for AUTH
10817          */
10818         if (sctp_auth_is_required_chunk(SCTP_ABORT_ASSOCIATION,
10819             stcb->asoc.peer_auth_chunks)) {
10820                 m_out = sctp_add_auth_chunk(NULL, &m_end, &auth, &auth_offset,
10821                     stcb, SCTP_ABORT_ASSOCIATION);
10822                 SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
10823         } else {
10824                 m_out = NULL;
10825         }
10826         m_abort = sctp_get_mbuf_for_msg(sizeof(struct sctp_abort_chunk), 0, M_NOWAIT, 1, MT_HEADER);
10827         if (m_abort == NULL) {
10828                 if (m_out) {
10829                         sctp_m_freem(m_out);
10830                 }
10831                 if (operr) {
10832                         sctp_m_freem(operr);
10833                 }
10834                 return;
10835         }
10836         /* link in any error */
10837         SCTP_BUF_NEXT(m_abort) = operr;
10838         cause_len = 0;
10839         m_last = NULL;
10840         for (m = operr; m; m = SCTP_BUF_NEXT(m)) {
10841                 cause_len += (uint16_t)SCTP_BUF_LEN(m);
10842                 if (SCTP_BUF_NEXT(m) == NULL) {
10843                         m_last = m;
10844                 }
10845         }
10846         SCTP_BUF_LEN(m_abort) = sizeof(struct sctp_abort_chunk);
10847         chunk_len = (uint16_t)sizeof(struct sctp_abort_chunk) + cause_len;
10848         padding_len = SCTP_SIZE32(chunk_len) - chunk_len;
10849         if (m_out == NULL) {
10850                 /* NO Auth chunk prepended, so reserve space in front */
10851                 SCTP_BUF_RESV_UF(m_abort, SCTP_MIN_OVERHEAD);
10852                 m_out = m_abort;
10853         } else {
10854                 /* Put AUTH chunk at the front of the chain */
10855                 SCTP_BUF_NEXT(m_end) = m_abort;
10856         }
10857         if (stcb->asoc.alternate) {
10858                 net = stcb->asoc.alternate;
10859         } else {
10860                 net = stcb->asoc.primary_destination;
10861         }
10862         /* Fill in the ABORT chunk header. */
10863         abort = mtod(m_abort, struct sctp_abort_chunk *);
10864         abort->ch.chunk_type = SCTP_ABORT_ASSOCIATION;
10865         if (stcb->asoc.peer_vtag == 0) {
10866                 /* This happens iff the assoc is in COOKIE-WAIT state. */
10867                 vtag = stcb->asoc.my_vtag;
10868                 abort->ch.chunk_flags = SCTP_HAD_NO_TCB;
10869         } else {
10870                 vtag = stcb->asoc.peer_vtag;
10871                 abort->ch.chunk_flags = 0;
10872         }
10873         abort->ch.chunk_length = htons(chunk_len);
10874         /* Add padding, if necessary. */
10875         if (padding_len > 0) {
10876                 if ((m_last == NULL) ||
10877                     (sctp_add_pad_tombuf(m_last, padding_len) == NULL)) {
10878                         sctp_m_freem(m_out);
10879                         return;
10880                 }
10881         }
10882         if ((error = sctp_lowlevel_chunk_output(stcb->sctp_ep, stcb, net,
10883             (struct sockaddr *)&net->ro._l_addr,
10884             m_out, auth_offset, auth, stcb->asoc.authinfo.active_keyid, 1, 0, 0,
10885             stcb->sctp_ep->sctp_lport, stcb->rport, htonl(vtag),
10886             stcb->asoc.primary_destination->port, NULL,
10887             0, 0,
10888             so_locked))) {
10889                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
10890                 if (error == ENOBUFS) {
10891                         stcb->asoc.ifp_had_enobuf = 1;
10892                         SCTP_STAT_INCR(sctps_lowlevelerr);
10893                 }
10894         } else {
10895                 stcb->asoc.ifp_had_enobuf = 0;
10896         }
10897         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
10898 }
10899
10900 void
10901 sctp_send_shutdown_complete(struct sctp_tcb *stcb,
10902     struct sctp_nets *net,
10903     int reflect_vtag)
10904 {
10905         /* formulate and SEND a SHUTDOWN-COMPLETE */
10906         struct mbuf *m_shutdown_comp;
10907         struct sctp_shutdown_complete_chunk *shutdown_complete;
10908         uint32_t vtag;
10909         int error;
10910         uint8_t flags;
10911
10912         m_shutdown_comp = sctp_get_mbuf_for_msg(sizeof(struct sctp_chunkhdr), 0, M_NOWAIT, 1, MT_HEADER);
10913         if (m_shutdown_comp == NULL) {
10914                 /* no mbuf's */
10915                 return;
10916         }
10917         if (reflect_vtag) {
10918                 flags = SCTP_HAD_NO_TCB;
10919                 vtag = stcb->asoc.my_vtag;
10920         } else {
10921                 flags = 0;
10922                 vtag = stcb->asoc.peer_vtag;
10923         }
10924         shutdown_complete = mtod(m_shutdown_comp, struct sctp_shutdown_complete_chunk *);
10925         shutdown_complete->ch.chunk_type = SCTP_SHUTDOWN_COMPLETE;
10926         shutdown_complete->ch.chunk_flags = flags;
10927         shutdown_complete->ch.chunk_length = htons(sizeof(struct sctp_shutdown_complete_chunk));
10928         SCTP_BUF_LEN(m_shutdown_comp) = sizeof(struct sctp_shutdown_complete_chunk);
10929         if ((error = sctp_lowlevel_chunk_output(stcb->sctp_ep, stcb, net,
10930             (struct sockaddr *)&net->ro._l_addr,
10931             m_shutdown_comp, 0, NULL, 0, 1, 0, 0,
10932             stcb->sctp_ep->sctp_lport, stcb->rport,
10933             htonl(vtag),
10934             net->port, NULL,
10935             0, 0,
10936             SCTP_SO_NOT_LOCKED))) {
10937                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
10938                 if (error == ENOBUFS) {
10939                         stcb->asoc.ifp_had_enobuf = 1;
10940                         SCTP_STAT_INCR(sctps_lowlevelerr);
10941                 }
10942         } else {
10943                 stcb->asoc.ifp_had_enobuf = 0;
10944         }
10945         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
10946         return;
10947 }
10948
10949 static void
10950 sctp_send_resp_msg(struct sockaddr *src, struct sockaddr *dst,
10951     struct sctphdr *sh, uint32_t vtag,
10952     uint8_t type, struct mbuf *cause,
10953     uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum,
10954     uint32_t vrf_id, uint16_t port)
10955 {
10956         struct mbuf *o_pak;
10957         struct mbuf *mout;
10958         struct sctphdr *shout;
10959         struct sctp_chunkhdr *ch;
10960 #if defined(INET) || defined(INET6)
10961         struct udphdr *udp;
10962 #endif
10963         int ret, len, cause_len, padding_len;
10964 #ifdef INET
10965         struct sockaddr_in *src_sin, *dst_sin;
10966         struct ip *ip;
10967 #endif
10968 #ifdef INET6
10969         struct sockaddr_in6 *src_sin6, *dst_sin6;
10970         struct ip6_hdr *ip6;
10971 #endif
10972
10973         /* Compute the length of the cause and add final padding. */
10974         cause_len = 0;
10975         if (cause != NULL) {
10976                 struct mbuf *m_at, *m_last = NULL;
10977
10978                 for (m_at = cause; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
10979                         if (SCTP_BUF_NEXT(m_at) == NULL)
10980                                 m_last = m_at;
10981                         cause_len += SCTP_BUF_LEN(m_at);
10982                 }
10983                 padding_len = cause_len % 4;
10984                 if (padding_len != 0) {
10985                         padding_len = 4 - padding_len;
10986                 }
10987                 if (padding_len != 0) {
10988                         if (sctp_add_pad_tombuf(m_last, padding_len) == NULL) {
10989                                 sctp_m_freem(cause);
10990                                 return;
10991                         }
10992                 }
10993         } else {
10994                 padding_len = 0;
10995         }
10996         /* Get an mbuf for the header. */
10997         len = sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
10998         switch (dst->sa_family) {
10999 #ifdef INET
11000         case AF_INET:
11001                 len += sizeof(struct ip);
11002                 break;
11003 #endif
11004 #ifdef INET6
11005         case AF_INET6:
11006                 len += sizeof(struct ip6_hdr);
11007                 break;
11008 #endif
11009         default:
11010                 break;
11011         }
11012 #if defined(INET) || defined(INET6)
11013         if (port) {
11014                 len += sizeof(struct udphdr);
11015         }
11016 #endif
11017         mout = sctp_get_mbuf_for_msg(len + max_linkhdr, 1, M_NOWAIT, 1, MT_DATA);
11018         if (mout == NULL) {
11019                 if (cause) {
11020                         sctp_m_freem(cause);
11021                 }
11022                 return;
11023         }
11024         SCTP_BUF_RESV_UF(mout, max_linkhdr);
11025         SCTP_BUF_LEN(mout) = len;
11026         SCTP_BUF_NEXT(mout) = cause;
11027         M_SETFIB(mout, fibnum);
11028         mout->m_pkthdr.flowid = mflowid;
11029         M_HASHTYPE_SET(mout, mflowtype);
11030 #ifdef INET
11031         ip = NULL;
11032 #endif
11033 #ifdef INET6
11034         ip6 = NULL;
11035 #endif
11036         switch (dst->sa_family) {
11037 #ifdef INET
11038         case AF_INET:
11039                 src_sin = (struct sockaddr_in *)src;
11040                 dst_sin = (struct sockaddr_in *)dst;
11041                 ip = mtod(mout, struct ip *);
11042                 ip->ip_v = IPVERSION;
11043                 ip->ip_hl = (sizeof(struct ip) >> 2);
11044                 ip->ip_tos = 0;
11045                 ip->ip_off = htons(IP_DF);
11046                 ip_fillid(ip);
11047                 ip->ip_ttl = MODULE_GLOBAL(ip_defttl);
11048                 if (port) {
11049                         ip->ip_p = IPPROTO_UDP;
11050                 } else {
11051                         ip->ip_p = IPPROTO_SCTP;
11052                 }
11053                 ip->ip_src.s_addr = dst_sin->sin_addr.s_addr;
11054                 ip->ip_dst.s_addr = src_sin->sin_addr.s_addr;
11055                 ip->ip_sum = 0;
11056                 len = sizeof(struct ip);
11057                 shout = (struct sctphdr *)((caddr_t)ip + len);
11058                 break;
11059 #endif
11060 #ifdef INET6
11061         case AF_INET6:
11062                 src_sin6 = (struct sockaddr_in6 *)src;
11063                 dst_sin6 = (struct sockaddr_in6 *)dst;
11064                 ip6 = mtod(mout, struct ip6_hdr *);
11065                 ip6->ip6_flow = htonl(0x60000000);
11066                 if (V_ip6_auto_flowlabel) {
11067                         ip6->ip6_flow |= (htonl(ip6_randomflowlabel()) & IPV6_FLOWLABEL_MASK);
11068                 }
11069                 ip6->ip6_hlim = MODULE_GLOBAL(ip6_defhlim);
11070                 if (port) {
11071                         ip6->ip6_nxt = IPPROTO_UDP;
11072                 } else {
11073                         ip6->ip6_nxt = IPPROTO_SCTP;
11074                 }
11075                 ip6->ip6_src = dst_sin6->sin6_addr;
11076                 ip6->ip6_dst = src_sin6->sin6_addr;
11077                 len = sizeof(struct ip6_hdr);
11078                 shout = (struct sctphdr *)((caddr_t)ip6 + len);
11079                 break;
11080 #endif
11081         default:
11082                 len = 0;
11083                 shout = mtod(mout, struct sctphdr *);
11084                 break;
11085         }
11086 #if defined(INET) || defined(INET6)
11087         if (port) {
11088                 if (htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port)) == 0) {
11089                         sctp_m_freem(mout);
11090                         return;
11091                 }
11092                 udp = (struct udphdr *)shout;
11093                 udp->uh_sport = htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port));
11094                 udp->uh_dport = port;
11095                 udp->uh_sum = 0;
11096                 udp->uh_ulen = htons((uint16_t)(sizeof(struct udphdr) +
11097                     sizeof(struct sctphdr) +
11098                     sizeof(struct sctp_chunkhdr) +
11099                     cause_len + padding_len));
11100                 len += sizeof(struct udphdr);
11101                 shout = (struct sctphdr *)((caddr_t)shout + sizeof(struct udphdr));
11102         } else {
11103                 udp = NULL;
11104         }
11105 #endif
11106         shout->src_port = sh->dest_port;
11107         shout->dest_port = sh->src_port;
11108         shout->checksum = 0;
11109         if (vtag) {
11110                 shout->v_tag = htonl(vtag);
11111         } else {
11112                 shout->v_tag = sh->v_tag;
11113         }
11114         len += sizeof(struct sctphdr);
11115         ch = (struct sctp_chunkhdr *)((caddr_t)shout + sizeof(struct sctphdr));
11116         ch->chunk_type = type;
11117         if (vtag) {
11118                 ch->chunk_flags = 0;
11119         } else {
11120                 ch->chunk_flags = SCTP_HAD_NO_TCB;
11121         }
11122         ch->chunk_length = htons((uint16_t)(sizeof(struct sctp_chunkhdr) + cause_len));
11123         len += sizeof(struct sctp_chunkhdr);
11124         len += cause_len + padding_len;
11125
11126         if (SCTP_GET_HEADER_FOR_OUTPUT(o_pak)) {
11127                 sctp_m_freem(mout);
11128                 return;
11129         }
11130         SCTP_ATTACH_CHAIN(o_pak, mout, len);
11131         switch (dst->sa_family) {
11132 #ifdef INET
11133         case AF_INET:
11134                 if (port) {
11135                         if (V_udp_cksum) {
11136                                 udp->uh_sum = in_pseudo(ip->ip_src.s_addr, ip->ip_dst.s_addr, udp->uh_ulen + htons(IPPROTO_UDP));
11137                         } else {
11138                                 udp->uh_sum = 0;
11139                         }
11140                 }
11141                 ip->ip_len = htons(len);
11142                 if (port) {
11143                         shout->checksum = sctp_calculate_cksum(mout, sizeof(struct ip) + sizeof(struct udphdr));
11144                         SCTP_STAT_INCR(sctps_sendswcrc);
11145                         if (V_udp_cksum) {
11146                                 SCTP_ENABLE_UDP_CSUM(o_pak);
11147                         }
11148                 } else {
11149                         mout->m_pkthdr.csum_flags = CSUM_SCTP;
11150                         mout->m_pkthdr.csum_data = offsetof(struct sctphdr, checksum);
11151                         SCTP_STAT_INCR(sctps_sendhwcrc);
11152                 }
11153 #ifdef SCTP_PACKET_LOGGING
11154                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING) {
11155                         sctp_packet_log(o_pak);
11156                 }
11157 #endif
11158                 SCTP_PROBE5(send, NULL, NULL, ip, NULL, shout);
11159                 SCTP_IP_OUTPUT(ret, o_pak, NULL, NULL, vrf_id);
11160                 break;
11161 #endif
11162 #ifdef INET6
11163         case AF_INET6:
11164                 ip6->ip6_plen = htons((uint16_t)(len - sizeof(struct ip6_hdr)));
11165                 if (port) {
11166                         shout->checksum = sctp_calculate_cksum(mout, sizeof(struct ip6_hdr) + sizeof(struct udphdr));
11167                         SCTP_STAT_INCR(sctps_sendswcrc);
11168                         if ((udp->uh_sum = in6_cksum(o_pak, IPPROTO_UDP, sizeof(struct ip6_hdr), len - sizeof(struct ip6_hdr))) == 0) {
11169                                 udp->uh_sum = 0xffff;
11170                         }
11171                 } else {
11172                         mout->m_pkthdr.csum_flags = CSUM_SCTP_IPV6;
11173                         mout->m_pkthdr.csum_data = offsetof(struct sctphdr, checksum);
11174                         SCTP_STAT_INCR(sctps_sendhwcrc);
11175                 }
11176 #ifdef SCTP_PACKET_LOGGING
11177                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING) {
11178                         sctp_packet_log(o_pak);
11179                 }
11180 #endif
11181                 SCTP_PROBE5(send, NULL, NULL, ip6, NULL, shout);
11182                 SCTP_IP6_OUTPUT(ret, o_pak, NULL, NULL, NULL, vrf_id);
11183                 break;
11184 #endif
11185         default:
11186                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Unknown protocol (TSNH) type %d\n",
11187                     dst->sa_family);
11188                 sctp_m_freem(mout);
11189                 SCTP_LTRACE_ERR_RET_PKT(mout, NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EFAULT);
11190                 return;
11191         }
11192         SCTPDBG(SCTP_DEBUG_OUTPUT3, "return from send is %d\n", ret);
11193         if (port) {
11194                 UDPSTAT_INC(udps_opackets);
11195         }
11196         SCTP_STAT_INCR(sctps_sendpackets);
11197         SCTP_STAT_INCR_COUNTER64(sctps_outpackets);
11198         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
11199         if (ret) {
11200                 SCTP_STAT_INCR(sctps_senderrors);
11201         }
11202         return;
11203 }
11204
11205 void
11206 sctp_send_shutdown_complete2(struct sockaddr *src, struct sockaddr *dst,
11207     struct sctphdr *sh,
11208     uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum,
11209     uint32_t vrf_id, uint16_t port)
11210 {
11211         sctp_send_resp_msg(src, dst, sh, 0, SCTP_SHUTDOWN_COMPLETE, NULL,
11212             mflowtype, mflowid, fibnum,
11213             vrf_id, port);
11214 }
11215
11216 void
11217 sctp_send_hb(struct sctp_tcb *stcb, struct sctp_nets *net, int so_locked)
11218 {
11219         struct sctp_tmit_chunk *chk;
11220         struct sctp_heartbeat_chunk *hb;
11221         struct timeval now;
11222
11223         SCTP_TCB_LOCK_ASSERT(stcb);
11224         if (net == NULL) {
11225                 return;
11226         }
11227         (void)SCTP_GETTIME_TIMEVAL(&now);
11228         switch (net->ro._l_addr.sa.sa_family) {
11229 #ifdef INET
11230         case AF_INET:
11231                 break;
11232 #endif
11233 #ifdef INET6
11234         case AF_INET6:
11235                 break;
11236 #endif
11237         default:
11238                 return;
11239         }
11240         sctp_alloc_a_chunk(stcb, chk);
11241         if (chk == NULL) {
11242                 SCTPDBG(SCTP_DEBUG_OUTPUT4, "Gak, can't get a chunk for hb\n");
11243                 return;
11244         }
11245
11246         chk->copy_by_ref = 0;
11247         chk->rec.chunk_id.id = SCTP_HEARTBEAT_REQUEST;
11248         chk->rec.chunk_id.can_take_data = 1;
11249         chk->flags = 0;
11250         chk->asoc = &stcb->asoc;
11251         chk->send_size = sizeof(struct sctp_heartbeat_chunk);
11252
11253         chk->data = sctp_get_mbuf_for_msg(chk->send_size, 0, M_NOWAIT, 1, MT_HEADER);
11254         if (chk->data == NULL) {
11255                 sctp_free_a_chunk(stcb, chk, so_locked);
11256                 return;
11257         }
11258         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11259         SCTP_BUF_LEN(chk->data) = chk->send_size;
11260         chk->sent = SCTP_DATAGRAM_UNSENT;
11261         chk->snd_count = 0;
11262         chk->whoTo = net;
11263         atomic_add_int(&chk->whoTo->ref_count, 1);
11264         /* Now we have a mbuf that we can fill in with the details */
11265         hb = mtod(chk->data, struct sctp_heartbeat_chunk *);
11266         memset(hb, 0, sizeof(struct sctp_heartbeat_chunk));
11267         /* fill out chunk header */
11268         hb->ch.chunk_type = SCTP_HEARTBEAT_REQUEST;
11269         hb->ch.chunk_flags = 0;
11270         hb->ch.chunk_length = htons(chk->send_size);
11271         /* Fill out hb parameter */
11272         hb->heartbeat.hb_info.ph.param_type = htons(SCTP_HEARTBEAT_INFO);
11273         hb->heartbeat.hb_info.ph.param_length = htons(sizeof(struct sctp_heartbeat_info_param));
11274         hb->heartbeat.hb_info.time_value_1 = (uint32_t)now.tv_sec;
11275         hb->heartbeat.hb_info.time_value_2 = now.tv_usec;
11276         /* Did our user request this one, put it in */
11277         hb->heartbeat.hb_info.addr_family = (uint8_t)net->ro._l_addr.sa.sa_family;
11278         hb->heartbeat.hb_info.addr_len = net->ro._l_addr.sa.sa_len;
11279         if (net->dest_state & SCTP_ADDR_UNCONFIRMED) {
11280                 /*
11281                  * we only take from the entropy pool if the address is not
11282                  * confirmed.
11283                  */
11284                 net->heartbeat_random1 = hb->heartbeat.hb_info.random_value1 = sctp_select_initial_TSN(&stcb->sctp_ep->sctp_ep);
11285                 net->heartbeat_random2 = hb->heartbeat.hb_info.random_value2 = sctp_select_initial_TSN(&stcb->sctp_ep->sctp_ep);
11286         } else {
11287                 net->heartbeat_random1 = hb->heartbeat.hb_info.random_value1 = 0;
11288                 net->heartbeat_random2 = hb->heartbeat.hb_info.random_value2 = 0;
11289         }
11290         switch (net->ro._l_addr.sa.sa_family) {
11291 #ifdef INET
11292         case AF_INET:
11293                 memcpy(hb->heartbeat.hb_info.address,
11294                     &net->ro._l_addr.sin.sin_addr,
11295                     sizeof(net->ro._l_addr.sin.sin_addr));
11296                 break;
11297 #endif
11298 #ifdef INET6
11299         case AF_INET6:
11300                 memcpy(hb->heartbeat.hb_info.address,
11301                     &net->ro._l_addr.sin6.sin6_addr,
11302                     sizeof(net->ro._l_addr.sin6.sin6_addr));
11303                 break;
11304 #endif
11305         default:
11306                 if (chk->data) {
11307                         sctp_m_freem(chk->data);
11308                         chk->data = NULL;
11309                 }
11310                 sctp_free_a_chunk(stcb, chk, so_locked);
11311                 return;
11312                 break;
11313         }
11314         net->hb_responded = 0;
11315         TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
11316         stcb->asoc.ctrl_queue_cnt++;
11317         SCTP_STAT_INCR(sctps_sendheartbeat);
11318         return;
11319 }
11320
11321 void
11322 sctp_send_ecn_echo(struct sctp_tcb *stcb, struct sctp_nets *net,
11323     uint32_t high_tsn)
11324 {
11325         struct sctp_association *asoc;
11326         struct sctp_ecne_chunk *ecne;
11327         struct sctp_tmit_chunk *chk;
11328
11329         if (net == NULL) {
11330                 return;
11331         }
11332         asoc = &stcb->asoc;
11333         SCTP_TCB_LOCK_ASSERT(stcb);
11334         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
11335                 if ((chk->rec.chunk_id.id == SCTP_ECN_ECHO) && (net == chk->whoTo)) {
11336                         /* found a previous ECN_ECHO update it if needed */
11337                         uint32_t cnt, ctsn;
11338
11339                         ecne = mtod(chk->data, struct sctp_ecne_chunk *);
11340                         ctsn = ntohl(ecne->tsn);
11341                         if (SCTP_TSN_GT(high_tsn, ctsn)) {
11342                                 ecne->tsn = htonl(high_tsn);
11343                                 SCTP_STAT_INCR(sctps_queue_upd_ecne);
11344                         }
11345                         cnt = ntohl(ecne->num_pkts_since_cwr);
11346                         cnt++;
11347                         ecne->num_pkts_since_cwr = htonl(cnt);
11348                         return;
11349                 }
11350         }
11351         /* nope could not find one to update so we must build one */
11352         sctp_alloc_a_chunk(stcb, chk);
11353         if (chk == NULL) {
11354                 return;
11355         }
11356         SCTP_STAT_INCR(sctps_queue_upd_ecne);
11357         chk->copy_by_ref = 0;
11358         chk->rec.chunk_id.id = SCTP_ECN_ECHO;
11359         chk->rec.chunk_id.can_take_data = 0;
11360         chk->flags = 0;
11361         chk->asoc = &stcb->asoc;
11362         chk->send_size = sizeof(struct sctp_ecne_chunk);
11363         chk->data = sctp_get_mbuf_for_msg(chk->send_size, 0, M_NOWAIT, 1, MT_HEADER);
11364         if (chk->data == NULL) {
11365                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
11366                 return;
11367         }
11368         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11369         SCTP_BUF_LEN(chk->data) = chk->send_size;
11370         chk->sent = SCTP_DATAGRAM_UNSENT;
11371         chk->snd_count = 0;
11372         chk->whoTo = net;
11373         atomic_add_int(&chk->whoTo->ref_count, 1);
11374
11375         stcb->asoc.ecn_echo_cnt_onq++;
11376         ecne = mtod(chk->data, struct sctp_ecne_chunk *);
11377         ecne->ch.chunk_type = SCTP_ECN_ECHO;
11378         ecne->ch.chunk_flags = 0;
11379         ecne->ch.chunk_length = htons(sizeof(struct sctp_ecne_chunk));
11380         ecne->tsn = htonl(high_tsn);
11381         ecne->num_pkts_since_cwr = htonl(1);
11382         TAILQ_INSERT_HEAD(&stcb->asoc.control_send_queue, chk, sctp_next);
11383         asoc->ctrl_queue_cnt++;
11384 }
11385
11386 void
11387 sctp_send_packet_dropped(struct sctp_tcb *stcb, struct sctp_nets *net,
11388     struct mbuf *m, int len, int iphlen, int bad_crc)
11389 {
11390         struct sctp_association *asoc;
11391         struct sctp_pktdrop_chunk *drp;
11392         struct sctp_tmit_chunk *chk;
11393         uint8_t *datap;
11394         int was_trunc = 0;
11395         int fullsz = 0;
11396         long spc;
11397         int offset;
11398         struct sctp_chunkhdr *ch, chunk_buf;
11399         unsigned int chk_length;
11400
11401         if (!stcb) {
11402                 return;
11403         }
11404         asoc = &stcb->asoc;
11405         SCTP_TCB_LOCK_ASSERT(stcb);
11406         if (asoc->pktdrop_supported == 0) {
11407                 /*-
11408                  * peer must declare support before I send one.
11409                  */
11410                 return;
11411         }
11412         if (stcb->sctp_socket == NULL) {
11413                 return;
11414         }
11415         sctp_alloc_a_chunk(stcb, chk);
11416         if (chk == NULL) {
11417                 return;
11418         }
11419         chk->copy_by_ref = 0;
11420         chk->rec.chunk_id.id = SCTP_PACKET_DROPPED;
11421         chk->rec.chunk_id.can_take_data = 1;
11422         chk->flags = 0;
11423         len -= iphlen;
11424         chk->send_size = len;
11425         /* Validate that we do not have an ABORT in here. */
11426         offset = iphlen + sizeof(struct sctphdr);
11427         ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, offset,
11428             sizeof(*ch), (uint8_t *)&chunk_buf);
11429         while (ch != NULL) {
11430                 chk_length = ntohs(ch->chunk_length);
11431                 if (chk_length < sizeof(*ch)) {
11432                         /* break to abort land */
11433                         break;
11434                 }
11435                 switch (ch->chunk_type) {
11436                 case SCTP_PACKET_DROPPED:
11437                 case SCTP_ABORT_ASSOCIATION:
11438                 case SCTP_INITIATION_ACK:
11439                         /**
11440                          * We don't respond with an PKT-DROP to an ABORT
11441                          * or PKT-DROP. We also do not respond to an
11442                          * INIT-ACK, because we can't know if the initiation
11443                          * tag is correct or not.
11444                          */
11445                         sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
11446                         return;
11447                 default:
11448                         break;
11449                 }
11450                 offset += SCTP_SIZE32(chk_length);
11451                 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, offset,
11452                     sizeof(*ch), (uint8_t *)&chunk_buf);
11453         }
11454
11455         if ((len + SCTP_MAX_OVERHEAD + sizeof(struct sctp_pktdrop_chunk)) >
11456             min(stcb->asoc.smallest_mtu, MCLBYTES)) {
11457                 /*
11458                  * only send 1 mtu worth, trim off the excess on the end.
11459                  */
11460                 fullsz = len;
11461                 len = min(stcb->asoc.smallest_mtu, MCLBYTES) - SCTP_MAX_OVERHEAD;
11462                 was_trunc = 1;
11463         }
11464         chk->asoc = &stcb->asoc;
11465         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
11466         if (chk->data == NULL) {
11467 jump_out:
11468                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
11469                 return;
11470         }
11471         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11472         drp = mtod(chk->data, struct sctp_pktdrop_chunk *);
11473         if (drp == NULL) {
11474                 sctp_m_freem(chk->data);
11475                 chk->data = NULL;
11476                 goto jump_out;
11477         }
11478         chk->book_size = SCTP_SIZE32((chk->send_size + sizeof(struct sctp_pktdrop_chunk) +
11479             sizeof(struct sctphdr) + SCTP_MED_OVERHEAD));
11480         chk->book_size_scale = 0;
11481         if (was_trunc) {
11482                 drp->ch.chunk_flags = SCTP_PACKET_TRUNCATED;
11483                 drp->trunc_len = htons(fullsz);
11484                 /*
11485                  * Len is already adjusted to size minus overhead above take
11486                  * out the pkt_drop chunk itself from it.
11487                  */
11488                 chk->send_size = (uint16_t)(len - sizeof(struct sctp_pktdrop_chunk));
11489                 len = chk->send_size;
11490         } else {
11491                 /* no truncation needed */
11492                 drp->ch.chunk_flags = 0;
11493                 drp->trunc_len = htons(0);
11494         }
11495         if (bad_crc) {
11496                 drp->ch.chunk_flags |= SCTP_BADCRC;
11497         }
11498         chk->send_size += sizeof(struct sctp_pktdrop_chunk);
11499         SCTP_BUF_LEN(chk->data) = chk->send_size;
11500         chk->sent = SCTP_DATAGRAM_UNSENT;
11501         chk->snd_count = 0;
11502         if (net) {
11503                 /* we should hit here */
11504                 chk->whoTo = net;
11505                 atomic_add_int(&chk->whoTo->ref_count, 1);
11506         } else {
11507                 chk->whoTo = NULL;
11508         }
11509         drp->ch.chunk_type = SCTP_PACKET_DROPPED;
11510         drp->ch.chunk_length = htons(chk->send_size);
11511         spc = SCTP_SB_LIMIT_RCV(stcb->sctp_socket);
11512         if (spc < 0) {
11513                 spc = 0;
11514         }
11515         drp->bottle_bw = htonl(spc);
11516         if (asoc->my_rwnd) {
11517                 drp->current_onq = htonl(asoc->size_on_reasm_queue +
11518                     asoc->size_on_all_streams +
11519                     asoc->my_rwnd_control_len +
11520                     SCTP_SBAVAIL(&stcb->sctp_socket->so_rcv));
11521         } else {
11522                 /*-
11523                  * If my rwnd is 0, possibly from mbuf depletion as well as
11524                  * space used, tell the peer there is NO space aka onq == bw
11525                  */
11526                 drp->current_onq = htonl(spc);
11527         }
11528         drp->reserved = 0;
11529         datap = drp->data;
11530         m_copydata(m, iphlen, len, (caddr_t)datap);
11531         TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
11532         asoc->ctrl_queue_cnt++;
11533 }
11534
11535 void
11536 sctp_send_cwr(struct sctp_tcb *stcb, struct sctp_nets *net, uint32_t high_tsn, uint8_t override)
11537 {
11538         struct sctp_association *asoc;
11539         struct sctp_cwr_chunk *cwr;
11540         struct sctp_tmit_chunk *chk;
11541
11542         SCTP_TCB_LOCK_ASSERT(stcb);
11543         if (net == NULL) {
11544                 return;
11545         }
11546         asoc = &stcb->asoc;
11547         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
11548                 if ((chk->rec.chunk_id.id == SCTP_ECN_CWR) && (net == chk->whoTo)) {
11549                         /*
11550                          * found a previous CWR queued to same destination
11551                          * update it if needed
11552                          */
11553                         uint32_t ctsn;
11554
11555                         cwr = mtod(chk->data, struct sctp_cwr_chunk *);
11556                         ctsn = ntohl(cwr->tsn);
11557                         if (SCTP_TSN_GT(high_tsn, ctsn)) {
11558                                 cwr->tsn = htonl(high_tsn);
11559                         }
11560                         if (override & SCTP_CWR_REDUCE_OVERRIDE) {
11561                                 /* Make sure override is carried */
11562                                 cwr->ch.chunk_flags |= SCTP_CWR_REDUCE_OVERRIDE;
11563                         }
11564                         return;
11565                 }
11566         }
11567         sctp_alloc_a_chunk(stcb, chk);
11568         if (chk == NULL) {
11569                 return;
11570         }
11571         chk->copy_by_ref = 0;
11572         chk->rec.chunk_id.id = SCTP_ECN_CWR;
11573         chk->rec.chunk_id.can_take_data = 1;
11574         chk->flags = 0;
11575         chk->asoc = asoc;
11576         chk->send_size = sizeof(struct sctp_cwr_chunk);
11577         chk->data = sctp_get_mbuf_for_msg(chk->send_size, 0, M_NOWAIT, 1, MT_HEADER);
11578         if (chk->data == NULL) {
11579                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
11580                 return;
11581         }
11582         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11583         SCTP_BUF_LEN(chk->data) = chk->send_size;
11584         chk->sent = SCTP_DATAGRAM_UNSENT;
11585         chk->snd_count = 0;
11586         chk->whoTo = net;
11587         atomic_add_int(&chk->whoTo->ref_count, 1);
11588         cwr = mtod(chk->data, struct sctp_cwr_chunk *);
11589         cwr->ch.chunk_type = SCTP_ECN_CWR;
11590         cwr->ch.chunk_flags = override;
11591         cwr->ch.chunk_length = htons(sizeof(struct sctp_cwr_chunk));
11592         cwr->tsn = htonl(high_tsn);
11593         TAILQ_INSERT_TAIL(&asoc->control_send_queue, chk, sctp_next);
11594         asoc->ctrl_queue_cnt++;
11595 }
11596
11597 static int
11598 sctp_add_stream_reset_out(struct sctp_tcb *stcb, struct sctp_tmit_chunk *chk,
11599     uint32_t seq, uint32_t resp_seq, uint32_t last_sent)
11600 {
11601         uint16_t len, old_len, i;
11602         struct sctp_stream_reset_out_request *req_out;
11603         struct sctp_chunkhdr *ch;
11604         int at;
11605         int number_entries = 0;
11606
11607         ch = mtod(chk->data, struct sctp_chunkhdr *);
11608         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11609         /* get to new offset for the param. */
11610         req_out = (struct sctp_stream_reset_out_request *)((caddr_t)ch + len);
11611         /* now how long will this param be? */
11612         for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
11613                 if ((stcb->asoc.strmout[i].state == SCTP_STREAM_RESET_PENDING) &&
11614                     (stcb->asoc.strmout[i].chunks_on_queues == 0) &&
11615                     TAILQ_EMPTY(&stcb->asoc.strmout[i].outqueue)) {
11616                         number_entries++;
11617                 }
11618         }
11619         if (number_entries == 0) {
11620                 return (0);
11621         }
11622         if (number_entries == stcb->asoc.streamoutcnt) {
11623                 number_entries = 0;
11624         }
11625         if (number_entries > SCTP_MAX_STREAMS_AT_ONCE_RESET) {
11626                 number_entries = SCTP_MAX_STREAMS_AT_ONCE_RESET;
11627         }
11628         len = (uint16_t)(sizeof(struct sctp_stream_reset_out_request) + (sizeof(uint16_t) * number_entries));
11629         req_out->ph.param_type = htons(SCTP_STR_RESET_OUT_REQUEST);
11630         req_out->ph.param_length = htons(len);
11631         req_out->request_seq = htonl(seq);
11632         req_out->response_seq = htonl(resp_seq);
11633         req_out->send_reset_at_tsn = htonl(last_sent);
11634         at = 0;
11635         if (number_entries) {
11636                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
11637                         if ((stcb->asoc.strmout[i].state == SCTP_STREAM_RESET_PENDING) &&
11638                             (stcb->asoc.strmout[i].chunks_on_queues == 0) &&
11639                             TAILQ_EMPTY(&stcb->asoc.strmout[i].outqueue)) {
11640                                 req_out->list_of_streams[at] = htons(i);
11641                                 at++;
11642                                 stcb->asoc.strmout[i].state = SCTP_STREAM_RESET_IN_FLIGHT;
11643                                 if (at >= number_entries) {
11644                                         break;
11645                                 }
11646                         }
11647                 }
11648         } else {
11649                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
11650                         stcb->asoc.strmout[i].state = SCTP_STREAM_RESET_IN_FLIGHT;
11651                 }
11652         }
11653         if (SCTP_SIZE32(len) > len) {
11654                 /*-
11655                  * Need to worry about the pad we may end up adding to the
11656                  * end. This is easy since the struct is either aligned to 4
11657                  * bytes or 2 bytes off.
11658                  */
11659                 req_out->list_of_streams[number_entries] = 0;
11660         }
11661         /* now fix the chunk length */
11662         ch->chunk_length = htons(len + old_len);
11663         chk->book_size = len + old_len;
11664         chk->book_size_scale = 0;
11665         chk->send_size = SCTP_SIZE32(chk->book_size);
11666         SCTP_BUF_LEN(chk->data) = chk->send_size;
11667         return (1);
11668 }
11669
11670 static void
11671 sctp_add_stream_reset_in(struct sctp_tmit_chunk *chk,
11672     int number_entries, uint16_t *list,
11673     uint32_t seq)
11674 {
11675         uint16_t len, old_len, i;
11676         struct sctp_stream_reset_in_request *req_in;
11677         struct sctp_chunkhdr *ch;
11678
11679         ch = mtod(chk->data, struct sctp_chunkhdr *);
11680         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11681
11682         /* get to new offset for the param. */
11683         req_in = (struct sctp_stream_reset_in_request *)((caddr_t)ch + len);
11684         /* now how long will this param be? */
11685         len = (uint16_t)(sizeof(struct sctp_stream_reset_in_request) + (sizeof(uint16_t) * number_entries));
11686         req_in->ph.param_type = htons(SCTP_STR_RESET_IN_REQUEST);
11687         req_in->ph.param_length = htons(len);
11688         req_in->request_seq = htonl(seq);
11689         if (number_entries) {
11690                 for (i = 0; i < number_entries; i++) {
11691                         req_in->list_of_streams[i] = htons(list[i]);
11692                 }
11693         }
11694         if (SCTP_SIZE32(len) > len) {
11695                 /*-
11696                  * Need to worry about the pad we may end up adding to the
11697                  * end. This is easy since the struct is either aligned to 4
11698                  * bytes or 2 bytes off.
11699                  */
11700                 req_in->list_of_streams[number_entries] = 0;
11701         }
11702         /* now fix the chunk length */
11703         ch->chunk_length = htons(len + old_len);
11704         chk->book_size = len + old_len;
11705         chk->book_size_scale = 0;
11706         chk->send_size = SCTP_SIZE32(chk->book_size);
11707         SCTP_BUF_LEN(chk->data) = chk->send_size;
11708         return;
11709 }
11710
11711 static void
11712 sctp_add_stream_reset_tsn(struct sctp_tmit_chunk *chk,
11713     uint32_t seq)
11714 {
11715         uint16_t len, old_len;
11716         struct sctp_stream_reset_tsn_request *req_tsn;
11717         struct sctp_chunkhdr *ch;
11718
11719         ch = mtod(chk->data, struct sctp_chunkhdr *);
11720         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11721
11722         /* get to new offset for the param. */
11723         req_tsn = (struct sctp_stream_reset_tsn_request *)((caddr_t)ch + len);
11724         /* now how long will this param be? */
11725         len = sizeof(struct sctp_stream_reset_tsn_request);
11726         req_tsn->ph.param_type = htons(SCTP_STR_RESET_TSN_REQUEST);
11727         req_tsn->ph.param_length = htons(len);
11728         req_tsn->request_seq = htonl(seq);
11729
11730         /* now fix the chunk length */
11731         ch->chunk_length = htons(len + old_len);
11732         chk->send_size = len + old_len;
11733         chk->book_size = SCTP_SIZE32(chk->send_size);
11734         chk->book_size_scale = 0;
11735         SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size);
11736         return;
11737 }
11738
11739 void
11740 sctp_add_stream_reset_result(struct sctp_tmit_chunk *chk,
11741     uint32_t resp_seq, uint32_t result)
11742 {
11743         uint16_t len, old_len;
11744         struct sctp_stream_reset_response *resp;
11745         struct sctp_chunkhdr *ch;
11746
11747         ch = mtod(chk->data, struct sctp_chunkhdr *);
11748         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11749
11750         /* get to new offset for the param. */
11751         resp = (struct sctp_stream_reset_response *)((caddr_t)ch + len);
11752         /* now how long will this param be? */
11753         len = sizeof(struct sctp_stream_reset_response);
11754         resp->ph.param_type = htons(SCTP_STR_RESET_RESPONSE);
11755         resp->ph.param_length = htons(len);
11756         resp->response_seq = htonl(resp_seq);
11757         resp->result = ntohl(result);
11758
11759         /* now fix the chunk length */
11760         ch->chunk_length = htons(len + old_len);
11761         chk->book_size = len + old_len;
11762         chk->book_size_scale = 0;
11763         chk->send_size = SCTP_SIZE32(chk->book_size);
11764         SCTP_BUF_LEN(chk->data) = chk->send_size;
11765         return;
11766 }
11767
11768 void
11769 sctp_send_deferred_reset_response(struct sctp_tcb *stcb,
11770     struct sctp_stream_reset_list *ent,
11771     int response)
11772 {
11773         struct sctp_association *asoc;
11774         struct sctp_tmit_chunk *chk;
11775         struct sctp_chunkhdr *ch;
11776
11777         asoc = &stcb->asoc;
11778
11779         /*
11780          * Reset our last reset action to the new one IP -> response
11781          * (PERFORMED probably). This assures that if we fail to send, a
11782          * retran from the peer will get the new response.
11783          */
11784         asoc->last_reset_action[0] = response;
11785         if (asoc->stream_reset_outstanding) {
11786                 return;
11787         }
11788         sctp_alloc_a_chunk(stcb, chk);
11789         if (chk == NULL) {
11790                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
11791                 return;
11792         }
11793         chk->copy_by_ref = 0;
11794         chk->rec.chunk_id.id = SCTP_STREAM_RESET;
11795         chk->rec.chunk_id.can_take_data = 0;
11796         chk->flags = 0;
11797         chk->asoc = &stcb->asoc;
11798         chk->book_size = sizeof(struct sctp_chunkhdr);
11799         chk->send_size = SCTP_SIZE32(chk->book_size);
11800         chk->book_size_scale = 0;
11801         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
11802         if (chk->data == NULL) {
11803                 sctp_free_a_chunk(stcb, chk, SCTP_SO_LOCKED);
11804                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
11805                 return;
11806         }
11807         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11808         /* setup chunk parameters */
11809         chk->sent = SCTP_DATAGRAM_UNSENT;
11810         chk->snd_count = 0;
11811         if (stcb->asoc.alternate) {
11812                 chk->whoTo = stcb->asoc.alternate;
11813         } else {
11814                 chk->whoTo = stcb->asoc.primary_destination;
11815         }
11816         ch = mtod(chk->data, struct sctp_chunkhdr *);
11817         ch->chunk_type = SCTP_STREAM_RESET;
11818         ch->chunk_flags = 0;
11819         ch->chunk_length = htons(chk->book_size);
11820         atomic_add_int(&chk->whoTo->ref_count, 1);
11821         SCTP_BUF_LEN(chk->data) = chk->send_size;
11822         sctp_add_stream_reset_result(chk, ent->seq, response);
11823         /* insert the chunk for sending */
11824         TAILQ_INSERT_TAIL(&asoc->control_send_queue,
11825             chk,
11826             sctp_next);
11827         asoc->ctrl_queue_cnt++;
11828 }
11829
11830 void
11831 sctp_add_stream_reset_result_tsn(struct sctp_tmit_chunk *chk,
11832     uint32_t resp_seq, uint32_t result,
11833     uint32_t send_una, uint32_t recv_next)
11834 {
11835         uint16_t len, old_len;
11836         struct sctp_stream_reset_response_tsn *resp;
11837         struct sctp_chunkhdr *ch;
11838
11839         ch = mtod(chk->data, struct sctp_chunkhdr *);
11840         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11841
11842         /* get to new offset for the param. */
11843         resp = (struct sctp_stream_reset_response_tsn *)((caddr_t)ch + len);
11844         /* now how long will this param be? */
11845         len = sizeof(struct sctp_stream_reset_response_tsn);
11846         resp->ph.param_type = htons(SCTP_STR_RESET_RESPONSE);
11847         resp->ph.param_length = htons(len);
11848         resp->response_seq = htonl(resp_seq);
11849         resp->result = htonl(result);
11850         resp->senders_next_tsn = htonl(send_una);
11851         resp->receivers_next_tsn = htonl(recv_next);
11852
11853         /* now fix the chunk length */
11854         ch->chunk_length = htons(len + old_len);
11855         chk->book_size = len + old_len;
11856         chk->send_size = SCTP_SIZE32(chk->book_size);
11857         chk->book_size_scale = 0;
11858         SCTP_BUF_LEN(chk->data) = chk->send_size;
11859         return;
11860 }
11861
11862 static void
11863 sctp_add_an_out_stream(struct sctp_tmit_chunk *chk,
11864     uint32_t seq,
11865     uint16_t adding)
11866 {
11867         uint16_t len, old_len;
11868         struct sctp_chunkhdr *ch;
11869         struct sctp_stream_reset_add_strm *addstr;
11870
11871         ch = mtod(chk->data, struct sctp_chunkhdr *);
11872         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11873
11874         /* get to new offset for the param. */
11875         addstr = (struct sctp_stream_reset_add_strm *)((caddr_t)ch + len);
11876         /* now how long will this param be? */
11877         len = sizeof(struct sctp_stream_reset_add_strm);
11878
11879         /* Fill it out. */
11880         addstr->ph.param_type = htons(SCTP_STR_RESET_ADD_OUT_STREAMS);
11881         addstr->ph.param_length = htons(len);
11882         addstr->request_seq = htonl(seq);
11883         addstr->number_of_streams = htons(adding);
11884         addstr->reserved = 0;
11885
11886         /* now fix the chunk length */
11887         ch->chunk_length = htons(len + old_len);
11888         chk->send_size = len + old_len;
11889         chk->book_size = SCTP_SIZE32(chk->send_size);
11890         chk->book_size_scale = 0;
11891         SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size);
11892         return;
11893 }
11894
11895 static void
11896 sctp_add_an_in_stream(struct sctp_tmit_chunk *chk,
11897     uint32_t seq,
11898     uint16_t adding)
11899 {
11900         uint16_t len, old_len;
11901         struct sctp_chunkhdr *ch;
11902         struct sctp_stream_reset_add_strm *addstr;
11903
11904         ch = mtod(chk->data, struct sctp_chunkhdr *);
11905         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11906
11907         /* get to new offset for the param. */
11908         addstr = (struct sctp_stream_reset_add_strm *)((caddr_t)ch + len);
11909         /* now how long will this param be? */
11910         len = sizeof(struct sctp_stream_reset_add_strm);
11911         /* Fill it out. */
11912         addstr->ph.param_type = htons(SCTP_STR_RESET_ADD_IN_STREAMS);
11913         addstr->ph.param_length = htons(len);
11914         addstr->request_seq = htonl(seq);
11915         addstr->number_of_streams = htons(adding);
11916         addstr->reserved = 0;
11917
11918         /* now fix the chunk length */
11919         ch->chunk_length = htons(len + old_len);
11920         chk->send_size = len + old_len;
11921         chk->book_size = SCTP_SIZE32(chk->send_size);
11922         chk->book_size_scale = 0;
11923         SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size);
11924         return;
11925 }
11926
11927 int
11928 sctp_send_stream_reset_out_if_possible(struct sctp_tcb *stcb, int so_locked)
11929 {
11930         struct sctp_association *asoc;
11931         struct sctp_tmit_chunk *chk;
11932         struct sctp_chunkhdr *ch;
11933         uint32_t seq;
11934
11935         asoc = &stcb->asoc;
11936         asoc->trigger_reset = 0;
11937         if (asoc->stream_reset_outstanding) {
11938                 return (EALREADY);
11939         }
11940         sctp_alloc_a_chunk(stcb, chk);
11941         if (chk == NULL) {
11942                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
11943                 return (ENOMEM);
11944         }
11945         chk->copy_by_ref = 0;
11946         chk->rec.chunk_id.id = SCTP_STREAM_RESET;
11947         chk->rec.chunk_id.can_take_data = 0;
11948         chk->flags = 0;
11949         chk->asoc = &stcb->asoc;
11950         chk->book_size = sizeof(struct sctp_chunkhdr);
11951         chk->send_size = SCTP_SIZE32(chk->book_size);
11952         chk->book_size_scale = 0;
11953         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
11954         if (chk->data == NULL) {
11955                 sctp_free_a_chunk(stcb, chk, so_locked);
11956                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
11957                 return (ENOMEM);
11958         }
11959         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11960
11961         /* setup chunk parameters */
11962         chk->sent = SCTP_DATAGRAM_UNSENT;
11963         chk->snd_count = 0;
11964         if (stcb->asoc.alternate) {
11965                 chk->whoTo = stcb->asoc.alternate;
11966         } else {
11967                 chk->whoTo = stcb->asoc.primary_destination;
11968         }
11969         ch = mtod(chk->data, struct sctp_chunkhdr *);
11970         ch->chunk_type = SCTP_STREAM_RESET;
11971         ch->chunk_flags = 0;
11972         ch->chunk_length = htons(chk->book_size);
11973         atomic_add_int(&chk->whoTo->ref_count, 1);
11974         SCTP_BUF_LEN(chk->data) = chk->send_size;
11975         seq = stcb->asoc.str_reset_seq_out;
11976         if (sctp_add_stream_reset_out(stcb, chk, seq, (stcb->asoc.str_reset_seq_in - 1), (stcb->asoc.sending_seq - 1))) {
11977                 seq++;
11978                 asoc->stream_reset_outstanding++;
11979         } else {
11980                 m_freem(chk->data);
11981                 chk->data = NULL;
11982                 sctp_free_a_chunk(stcb, chk, so_locked);
11983                 return (ENOENT);
11984         }
11985         asoc->str_reset = chk;
11986         /* insert the chunk for sending */
11987         TAILQ_INSERT_TAIL(&asoc->control_send_queue,
11988             chk,
11989             sctp_next);
11990         asoc->ctrl_queue_cnt++;
11991
11992         if (stcb->asoc.send_sack) {
11993                 sctp_send_sack(stcb, so_locked);
11994         }
11995         sctp_timer_start(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb, chk->whoTo);
11996         return (0);
11997 }
11998
11999 int
12000 sctp_send_str_reset_req(struct sctp_tcb *stcb,
12001     uint16_t number_entries, uint16_t *list,
12002     uint8_t send_in_req,
12003     uint8_t send_tsn_req,
12004     uint8_t add_stream,
12005     uint16_t adding_o,
12006     uint16_t adding_i, uint8_t peer_asked)
12007 {
12008         struct sctp_association *asoc;
12009         struct sctp_tmit_chunk *chk;
12010         struct sctp_chunkhdr *ch;
12011         int can_send_out_req = 0;
12012         uint32_t seq;
12013
12014         SCTP_TCB_LOCK_ASSERT(stcb);
12015
12016         asoc = &stcb->asoc;
12017         if (asoc->stream_reset_outstanding) {
12018                 /*-
12019                  * Already one pending, must get ACK back to clear the flag.
12020                  */
12021                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EBUSY);
12022                 return (EBUSY);
12023         }
12024         if ((send_in_req == 0) && (send_tsn_req == 0) &&
12025             (add_stream == 0)) {
12026                 /* nothing to do */
12027                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12028                 return (EINVAL);
12029         }
12030         if (send_tsn_req && send_in_req) {
12031                 /* error, can't do that */
12032                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12033                 return (EINVAL);
12034         } else if (send_in_req) {
12035                 can_send_out_req = 1;
12036         }
12037         if (number_entries > (MCLBYTES -
12038             SCTP_MIN_OVERHEAD -
12039             sizeof(struct sctp_chunkhdr) -
12040             sizeof(struct sctp_stream_reset_out_request)) /
12041             sizeof(uint16_t)) {
12042                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12043                 return (ENOMEM);
12044         }
12045         sctp_alloc_a_chunk(stcb, chk);
12046         if (chk == NULL) {
12047                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12048                 return (ENOMEM);
12049         }
12050         chk->copy_by_ref = 0;
12051         chk->rec.chunk_id.id = SCTP_STREAM_RESET;
12052         chk->rec.chunk_id.can_take_data = 0;
12053         chk->flags = 0;
12054         chk->asoc = &stcb->asoc;
12055         chk->book_size = sizeof(struct sctp_chunkhdr);
12056         chk->send_size = SCTP_SIZE32(chk->book_size);
12057         chk->book_size_scale = 0;
12058         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
12059         if (chk->data == NULL) {
12060                 sctp_free_a_chunk(stcb, chk, SCTP_SO_LOCKED);
12061                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12062                 return (ENOMEM);
12063         }
12064         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
12065
12066         /* setup chunk parameters */
12067         chk->sent = SCTP_DATAGRAM_UNSENT;
12068         chk->snd_count = 0;
12069         if (stcb->asoc.alternate) {
12070                 chk->whoTo = stcb->asoc.alternate;
12071         } else {
12072                 chk->whoTo = stcb->asoc.primary_destination;
12073         }
12074         atomic_add_int(&chk->whoTo->ref_count, 1);
12075         ch = mtod(chk->data, struct sctp_chunkhdr *);
12076         ch->chunk_type = SCTP_STREAM_RESET;
12077         ch->chunk_flags = 0;
12078         ch->chunk_length = htons(chk->book_size);
12079         SCTP_BUF_LEN(chk->data) = chk->send_size;
12080
12081         seq = stcb->asoc.str_reset_seq_out;
12082         if (can_send_out_req) {
12083                 int ret;
12084
12085                 ret = sctp_add_stream_reset_out(stcb, chk, seq, (stcb->asoc.str_reset_seq_in - 1), (stcb->asoc.sending_seq - 1));
12086                 if (ret) {
12087                         seq++;
12088                         asoc->stream_reset_outstanding++;
12089                 }
12090         }
12091         if ((add_stream & 1) &&
12092             ((stcb->asoc.strm_realoutsize - stcb->asoc.streamoutcnt) < adding_o)) {
12093                 /* Need to allocate more */
12094                 struct sctp_stream_out *oldstream;
12095                 struct sctp_stream_queue_pending *sp, *nsp;
12096                 int i;
12097 #if defined(SCTP_DETAILED_STR_STATS)
12098                 int j;
12099 #endif
12100
12101                 oldstream = stcb->asoc.strmout;
12102                 /* get some more */
12103                 SCTP_MALLOC(stcb->asoc.strmout, struct sctp_stream_out *,
12104                     (stcb->asoc.streamoutcnt + adding_o) * sizeof(struct sctp_stream_out),
12105                     SCTP_M_STRMO);
12106                 if (stcb->asoc.strmout == NULL) {
12107                         uint8_t x;
12108
12109                         stcb->asoc.strmout = oldstream;
12110                         /* Turn off the bit */
12111                         x = add_stream & 0xfe;
12112                         add_stream = x;
12113                         goto skip_stuff;
12114                 }
12115                 /*
12116                  * Ok now we proceed with copying the old out stuff and
12117                  * initializing the new stuff.
12118                  */
12119                 stcb->asoc.ss_functions.sctp_ss_clear(stcb, &stcb->asoc, false);
12120                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
12121                         TAILQ_INIT(&stcb->asoc.strmout[i].outqueue);
12122                         /* FIX ME FIX ME */
12123                         /*
12124                          * This should be a SS_COPY operation FIX ME STREAM
12125                          * SCHEDULER EXPERT
12126                          */
12127                         stcb->asoc.ss_functions.sctp_ss_init_stream(stcb, &stcb->asoc.strmout[i], &oldstream[i]);
12128                         stcb->asoc.strmout[i].chunks_on_queues = oldstream[i].chunks_on_queues;
12129 #if defined(SCTP_DETAILED_STR_STATS)
12130                         for (j = 0; j < SCTP_PR_SCTP_MAX + 1; j++) {
12131                                 stcb->asoc.strmout[i].abandoned_sent[j] = oldstream[i].abandoned_sent[j];
12132                                 stcb->asoc.strmout[i].abandoned_unsent[j] = oldstream[i].abandoned_unsent[j];
12133                         }
12134 #else
12135                         stcb->asoc.strmout[i].abandoned_sent[0] = oldstream[i].abandoned_sent[0];
12136                         stcb->asoc.strmout[i].abandoned_unsent[0] = oldstream[i].abandoned_unsent[0];
12137 #endif
12138                         stcb->asoc.strmout[i].next_mid_ordered = oldstream[i].next_mid_ordered;
12139                         stcb->asoc.strmout[i].next_mid_unordered = oldstream[i].next_mid_unordered;
12140                         stcb->asoc.strmout[i].last_msg_incomplete = oldstream[i].last_msg_incomplete;
12141                         stcb->asoc.strmout[i].sid = i;
12142                         stcb->asoc.strmout[i].state = oldstream[i].state;
12143                         /* now anything on those queues? */
12144                         TAILQ_FOREACH_SAFE(sp, &oldstream[i].outqueue, next, nsp) {
12145                                 TAILQ_REMOVE(&oldstream[i].outqueue, sp, next);
12146                                 TAILQ_INSERT_TAIL(&stcb->asoc.strmout[i].outqueue, sp, next);
12147                         }
12148                 }
12149                 /* now the new streams */
12150                 stcb->asoc.ss_functions.sctp_ss_init(stcb, &stcb->asoc);
12151                 for (i = stcb->asoc.streamoutcnt; i < (stcb->asoc.streamoutcnt + adding_o); i++) {
12152                         TAILQ_INIT(&stcb->asoc.strmout[i].outqueue);
12153                         stcb->asoc.strmout[i].chunks_on_queues = 0;
12154 #if defined(SCTP_DETAILED_STR_STATS)
12155                         for (j = 0; j < SCTP_PR_SCTP_MAX + 1; j++) {
12156                                 stcb->asoc.strmout[i].abandoned_sent[j] = 0;
12157                                 stcb->asoc.strmout[i].abandoned_unsent[j] = 0;
12158                         }
12159 #else
12160                         stcb->asoc.strmout[i].abandoned_sent[0] = 0;
12161                         stcb->asoc.strmout[i].abandoned_unsent[0] = 0;
12162 #endif
12163                         stcb->asoc.strmout[i].next_mid_ordered = 0;
12164                         stcb->asoc.strmout[i].next_mid_unordered = 0;
12165                         stcb->asoc.strmout[i].sid = i;
12166                         stcb->asoc.strmout[i].last_msg_incomplete = 0;
12167                         stcb->asoc.ss_functions.sctp_ss_init_stream(stcb, &stcb->asoc.strmout[i], NULL);
12168                         stcb->asoc.strmout[i].state = SCTP_STREAM_CLOSED;
12169                 }
12170                 stcb->asoc.strm_realoutsize = stcb->asoc.streamoutcnt + adding_o;
12171                 SCTP_FREE(oldstream, SCTP_M_STRMO);
12172         }
12173 skip_stuff:
12174         if ((add_stream & 1) && (adding_o > 0)) {
12175                 asoc->strm_pending_add_size = adding_o;
12176                 asoc->peer_req_out = peer_asked;
12177                 sctp_add_an_out_stream(chk, seq, adding_o);
12178                 seq++;
12179                 asoc->stream_reset_outstanding++;
12180         }
12181         if ((add_stream & 2) && (adding_i > 0)) {
12182                 sctp_add_an_in_stream(chk, seq, adding_i);
12183                 seq++;
12184                 asoc->stream_reset_outstanding++;
12185         }
12186         if (send_in_req) {
12187                 sctp_add_stream_reset_in(chk, number_entries, list, seq);
12188                 seq++;
12189                 asoc->stream_reset_outstanding++;
12190         }
12191         if (send_tsn_req) {
12192                 sctp_add_stream_reset_tsn(chk, seq);
12193                 asoc->stream_reset_outstanding++;
12194         }
12195         asoc->str_reset = chk;
12196         /* insert the chunk for sending */
12197         TAILQ_INSERT_TAIL(&asoc->control_send_queue,
12198             chk,
12199             sctp_next);
12200         asoc->ctrl_queue_cnt++;
12201         if (stcb->asoc.send_sack) {
12202                 sctp_send_sack(stcb, SCTP_SO_LOCKED);
12203         }
12204         sctp_timer_start(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb, chk->whoTo);
12205         return (0);
12206 }
12207
12208 void
12209 sctp_send_abort(struct mbuf *m, int iphlen, struct sockaddr *src, struct sockaddr *dst,
12210     struct sctphdr *sh, uint32_t vtag, struct mbuf *cause,
12211     uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum,
12212     uint32_t vrf_id, uint16_t port)
12213 {
12214         /* Don't respond to an ABORT with an ABORT. */
12215         if (sctp_is_there_an_abort_here(m, iphlen, &vtag)) {
12216                 if (cause)
12217                         sctp_m_freem(cause);
12218                 return;
12219         }
12220         sctp_send_resp_msg(src, dst, sh, vtag, SCTP_ABORT_ASSOCIATION, cause,
12221             mflowtype, mflowid, fibnum,
12222             vrf_id, port);
12223         return;
12224 }
12225
12226 void
12227 sctp_send_operr_to(struct sockaddr *src, struct sockaddr *dst,
12228     struct sctphdr *sh, uint32_t vtag, struct mbuf *cause,
12229     uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum,
12230     uint32_t vrf_id, uint16_t port)
12231 {
12232         sctp_send_resp_msg(src, dst, sh, vtag, SCTP_OPERATION_ERROR, cause,
12233             mflowtype, mflowid, fibnum,
12234             vrf_id, port);
12235         return;
12236 }
12237
12238 static struct mbuf *
12239 sctp_copy_resume(struct uio *uio,
12240     int max_send_len,
12241     int user_marks_eor,
12242     int *error,
12243     uint32_t *sndout,
12244     struct mbuf **new_tail)
12245 {
12246         struct mbuf *m;
12247
12248         m = m_uiotombuf(uio, M_WAITOK, max_send_len, 0,
12249             (M_PKTHDR | (user_marks_eor ? M_EOR : 0)));
12250         if (m == NULL) {
12251                 /* The only possible error is EFAULT. */
12252                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EFAULT);
12253                 *error = EFAULT;
12254         } else {
12255                 *sndout = m_length(m, NULL);
12256                 *new_tail = m_last(m);
12257         }
12258         return (m);
12259 }
12260
12261 static int
12262 sctp_copy_one(struct sctp_stream_queue_pending *sp,
12263     struct uio *uio,
12264     int resv_upfront)
12265 {
12266         sp->data = m_uiotombuf(uio, M_WAITOK, sp->length, resv_upfront, 0);
12267         if (sp->data == NULL) {
12268                 /* The only possible error is EFAULT. */
12269                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EFAULT);
12270                 return (EFAULT);
12271         }
12272         sp->tail_mbuf = m_last(sp->data);
12273         return (0);
12274 }
12275
12276 static struct sctp_stream_queue_pending *
12277 sctp_copy_it_in(struct sctp_tcb *stcb,
12278     struct sctp_association *asoc,
12279     struct sctp_nonpad_sndrcvinfo *srcv,
12280     struct uio *uio,
12281     struct sctp_nets *net,
12282     ssize_t max_send_len,
12283     int user_marks_eor,
12284     int *error)
12285 {
12286
12287         /*-
12288          * This routine must be very careful in its work. Protocol
12289          * processing is up and running so care must be taken to spl...()
12290          * when you need to do something that may effect the stcb/asoc. The
12291          * sb is locked however. When data is copied the protocol processing
12292          * should be enabled since this is a slower operation...
12293          */
12294         struct sctp_stream_queue_pending *sp;
12295         int resv_in_first;
12296
12297         *error = 0;
12298         sctp_alloc_a_strmoq(stcb, sp);
12299         if (sp == NULL) {
12300                 SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12301                 *error = ENOMEM;
12302                 goto out_now;
12303         }
12304         sp->act_flags = 0;
12305         sp->sender_all_done = 0;
12306         sp->sinfo_flags = srcv->sinfo_flags;
12307         sp->timetolive = srcv->sinfo_timetolive;
12308         sp->ppid = srcv->sinfo_ppid;
12309         sp->context = srcv->sinfo_context;
12310         sp->fsn = 0;
12311         (void)SCTP_GETTIME_TIMEVAL(&sp->ts);
12312         sp->sid = srcv->sinfo_stream;
12313         sp->length = (uint32_t)min(uio->uio_resid, max_send_len);
12314         if ((sp->length == (uint32_t)uio->uio_resid) &&
12315             ((user_marks_eor == 0) ||
12316             (srcv->sinfo_flags & SCTP_EOF) ||
12317             (user_marks_eor && (srcv->sinfo_flags & SCTP_EOR)))) {
12318                 sp->msg_is_complete = 1;
12319         } else {
12320                 sp->msg_is_complete = 0;
12321         }
12322         sp->sender_all_done = 0;
12323         sp->some_taken = 0;
12324         sp->put_last_out = 0;
12325         resv_in_first = SCTP_DATA_CHUNK_OVERHEAD(stcb);
12326         sp->data = sp->tail_mbuf = NULL;
12327         if (sp->length == 0) {
12328                 goto skip_copy;
12329         }
12330         if (srcv->sinfo_keynumber_valid) {
12331                 sp->auth_keyid = srcv->sinfo_keynumber;
12332         } else {
12333                 sp->auth_keyid = stcb->asoc.authinfo.active_keyid;
12334         }
12335         if (sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks)) {
12336                 sctp_auth_key_acquire(stcb, sp->auth_keyid);
12337                 sp->holds_key_ref = 1;
12338         }
12339         *error = sctp_copy_one(sp, uio, resv_in_first);
12340 skip_copy:
12341         if (*error) {
12342                 sctp_free_a_strmoq(stcb, sp, SCTP_SO_LOCKED);
12343                 sp = NULL;
12344         } else {
12345                 if (sp->sinfo_flags & SCTP_ADDR_OVER) {
12346                         sp->net = net;
12347                         atomic_add_int(&sp->net->ref_count, 1);
12348                 } else {
12349                         sp->net = NULL;
12350                 }
12351                 sctp_set_prsctp_policy(sp);
12352         }
12353 out_now:
12354         return (sp);
12355 }
12356
12357 int
12358 sctp_sosend(struct socket *so,
12359     struct sockaddr *addr,
12360     struct uio *uio,
12361     struct mbuf *top,
12362     struct mbuf *control,
12363     int flags,
12364     struct thread *p)
12365 {
12366         struct sctp_sndrcvinfo sndrcvninfo;
12367 #if defined(INET) && defined(INET6)
12368         struct sockaddr_in sin;
12369 #endif
12370         struct sockaddr *addr_to_use;
12371         int error;
12372         bool use_sndinfo;
12373
12374         if (control != NULL) {
12375                 /* process cmsg snd/rcv info (maybe a assoc-id) */
12376                 use_sndinfo = sctp_find_cmsg(SCTP_SNDRCV, (void *)&sndrcvninfo, control, sizeof(sndrcvninfo));
12377         } else {
12378                 use_sndinfo = false;
12379         }
12380 #if defined(INET) && defined(INET6)
12381         if ((addr != NULL) && (addr->sa_family == AF_INET6)) {
12382                 struct sockaddr_in6 *sin6;
12383
12384                 if (addr->sa_len != sizeof(struct sockaddr_in6)) {
12385                         SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12386                         return (EINVAL);
12387                 }
12388                 sin6 = (struct sockaddr_in6 *)addr;
12389                 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
12390                         in6_sin6_2_sin(&sin, sin6);
12391                         addr_to_use = (struct sockaddr *)&sin;
12392                 } else {
12393                         addr_to_use = addr;
12394                 }
12395         } else {
12396                 addr_to_use = addr;
12397         }
12398 #else
12399         addr_to_use = addr;
12400 #endif
12401         error = sctp_lower_sosend(so, addr_to_use, uio, top, control, flags,
12402             use_sndinfo ? &sndrcvninfo : NULL, p);
12403         return (error);
12404 }
12405
12406 int
12407 sctp_lower_sosend(struct socket *so,
12408     struct sockaddr *addr,
12409     struct uio *uio,
12410     struct mbuf *top,
12411     struct mbuf *control,
12412     int flags,
12413     struct sctp_sndrcvinfo *srcv,
12414     struct thread *p)
12415 {
12416         struct sctp_nonpad_sndrcvinfo sndrcvninfo_buf;
12417         struct epoch_tracker et;
12418         struct timeval now;
12419         struct sctp_block_entry be;
12420         struct sctp_inpcb *inp;
12421         struct sctp_tcb *stcb = NULL;
12422         struct sctp_nets *net;
12423         struct sctp_association *asoc;
12424         struct sctp_inpcb *t_inp;
12425         struct sctp_nonpad_sndrcvinfo *sndrcvninfo;
12426         ssize_t sndlen = 0, max_len, local_add_more;
12427         ssize_t local_soresv = 0;
12428         sctp_assoc_t sinfo_assoc_id;
12429         int user_marks_eor;
12430         int nagle_applies = 0;
12431         int error;
12432         int queue_only = 0, queue_only_for_init = 0;
12433         int un_sent;
12434         int now_filled = 0;
12435         unsigned int inqueue_bytes = 0;
12436         uint16_t port;
12437         uint16_t sinfo_flags;
12438         uint16_t sinfo_stream;
12439         bool create_lock_applied = false;
12440         bool free_cnt_applied = false;
12441         bool some_on_control;
12442         bool got_all_of_the_send = false;
12443         bool non_blocking = false;
12444
12445         error = 0;
12446         net = NULL;
12447         stcb = NULL;
12448
12449         if ((uio == NULL) && (top == NULL)) {
12450                 error = EINVAL;
12451                 goto out_unlocked;
12452         }
12453         if (addr != NULL) {
12454                 union sctp_sockstore *raddr = (union sctp_sockstore *)addr;
12455
12456                 switch (raddr->sa.sa_family) {
12457 #ifdef INET
12458                 case AF_INET:
12459                         if (raddr->sin.sin_len != sizeof(struct sockaddr_in)) {
12460                                 error = EINVAL;
12461                                 goto out_unlocked;
12462                         }
12463                         port = raddr->sin.sin_port;
12464                         break;
12465 #endif
12466 #ifdef INET6
12467                 case AF_INET6:
12468                         if (raddr->sin6.sin6_len != sizeof(struct sockaddr_in6)) {
12469                                 error = EINVAL;
12470                                 goto out_unlocked;
12471                         }
12472                         port = raddr->sin6.sin6_port;
12473                         break;
12474 #endif
12475                 default:
12476                         error = EAFNOSUPPORT;
12477                         goto out_unlocked;
12478                 }
12479         } else {
12480                 port = 0;
12481         }
12482         if (uio != NULL) {
12483                 if (uio->uio_resid < 0) {
12484                         error = EINVAL;
12485                         goto out_unlocked;
12486                 }
12487                 sndlen = uio->uio_resid;
12488         } else {
12489                 sndlen = SCTP_HEADER_LEN(top);
12490         }
12491         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Send called addr:%p send length %zd\n",
12492             (void *)addr, sndlen);
12493
12494         t_inp = inp = (struct sctp_inpcb *)so->so_pcb;
12495         if (inp == NULL) {
12496                 error = EINVAL;
12497                 goto out_unlocked;
12498         }
12499         user_marks_eor = sctp_is_feature_on(inp, SCTP_PCB_FLAGS_EXPLICIT_EOR);
12500         if ((uio == NULL) && (user_marks_eor != 0)) {
12501                 /*-
12502                  * We do not support eeor mode for
12503                  * sending with mbuf chains (like sendfile).
12504                  */
12505                 error = EINVAL;
12506                 goto out_unlocked;
12507         }
12508         if ((inp->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) &&
12509             SCTP_IS_LISTENING(inp)) {
12510                 /* The listener can NOT send. */
12511                 error = EINVAL;
12512                 goto out_unlocked;
12513         }
12514         atomic_add_int(&inp->total_sends, 1);
12515
12516         if (srcv != NULL) {
12517                 sndrcvninfo = (struct sctp_nonpad_sndrcvinfo *)srcv;
12518                 sinfo_assoc_id = sndrcvninfo->sinfo_assoc_id;
12519                 sinfo_flags = sndrcvninfo->sinfo_flags;
12520                 if (INVALID_SINFO_FLAG(sinfo_flags) ||
12521                     PR_SCTP_INVALID_POLICY(sinfo_flags)) {
12522                         error = EINVAL;
12523                         goto out_unlocked;
12524                 }
12525                 if (sinfo_flags != 0) {
12526                         SCTP_STAT_INCR(sctps_sends_with_flags);
12527                 }
12528         } else {
12529                 sndrcvninfo = NULL;
12530                 sinfo_flags = inp->def_send.sinfo_flags;
12531                 sinfo_assoc_id = inp->def_send.sinfo_assoc_id;
12532         }
12533         if (flags & MSG_EOR) {
12534                 sinfo_flags |= SCTP_EOR;
12535         }
12536         if (flags & MSG_EOF) {
12537                 sinfo_flags |= SCTP_EOF;
12538         }
12539         if ((sinfo_flags & SCTP_ADDR_OVER) && (addr == NULL)) {
12540                 error = EINVAL;
12541                 goto out_unlocked;
12542         }
12543         SCTP_INP_RLOCK(inp);
12544         if ((sinfo_flags & SCTP_SENDALL) &&
12545             (inp->sctp_flags & SCTP_PCB_FLAGS_UDPTYPE)) {
12546                 SCTP_INP_RUNLOCK(inp);
12547                 error = sctp_sendall(inp, uio, top, sndrcvninfo);
12548                 top = NULL;
12549                 goto out_unlocked;
12550         }
12551         /* Now we must find the association. */
12552         if ((inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) ||
12553             (inp->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) {
12554                 stcb = LIST_FIRST(&inp->sctp_asoc_list);
12555                 if (stcb != NULL) {
12556                         SCTP_TCB_LOCK(stcb);
12557                 }
12558                 SCTP_INP_RUNLOCK(inp);
12559         } else if (sinfo_assoc_id > SCTP_ALL_ASSOC) {
12560                 stcb = sctp_findasoc_ep_asocid_locked(inp, sinfo_assoc_id, 1);
12561                 SCTP_INP_RUNLOCK(inp);
12562                 if (stcb != NULL) {
12563                         SCTP_TCB_LOCK_ASSERT(stcb);
12564                 }
12565         } else if (addr != NULL) {
12566                 /*-
12567                  * Since we did not use findep we must
12568                  * increment it, and if we don't find a tcb
12569                  * decrement it.
12570                  */
12571                 SCTP_INP_INCR_REF(inp);
12572                 SCTP_INP_RUNLOCK(inp);
12573                 stcb = sctp_findassociation_ep_addr(&t_inp, addr, &net, NULL, NULL);
12574                 if (stcb == NULL) {
12575                         SCTP_INP_WLOCK(inp);
12576                         SCTP_INP_DECR_REF(inp);
12577                         SCTP_INP_WUNLOCK(inp);
12578                 } else {
12579                         SCTP_TCB_LOCK_ASSERT(stcb);
12580                 }
12581         } else {
12582                 SCTP_INP_RUNLOCK(inp);
12583         }
12584
12585 #ifdef INVARIANTS
12586         if (stcb != NULL) {
12587                 SCTP_TCB_LOCK_ASSERT(stcb);
12588         }
12589 #endif
12590
12591         if ((stcb == NULL) && (addr != NULL)) {
12592                 /* Possible implicit send? */
12593                 SCTP_ASOC_CREATE_LOCK(inp);
12594                 create_lock_applied = true;
12595                 if ((inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) ||
12596                     (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE)) {
12597                         error = EINVAL;
12598                         goto out_unlocked;
12599                 }
12600                 if (((inp->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) == 0) &&
12601                     (addr->sa_family == AF_INET6)) {
12602                         error = EINVAL;
12603                         goto out_unlocked;
12604                 }
12605                 SCTP_INP_WLOCK(inp);
12606                 SCTP_INP_INCR_REF(inp);
12607                 SCTP_INP_WUNLOCK(inp);
12608                 /* With the lock applied look again */
12609                 stcb = sctp_findassociation_ep_addr(&t_inp, addr, &net, NULL, NULL);
12610 #if defined(INET) || defined(INET6)
12611                 if ((stcb == NULL) && (control != NULL) && (port > 0)) {
12612                         stcb = sctp_findassociation_cmsgs(&t_inp, port, control, &net, &error);
12613                 }
12614 #endif
12615                 if (stcb == NULL) {
12616                         SCTP_INP_WLOCK(inp);
12617                         SCTP_INP_DECR_REF(inp);
12618                         SCTP_INP_WUNLOCK(inp);
12619                 } else {
12620                         SCTP_TCB_LOCK_ASSERT(stcb);
12621                         SCTP_ASOC_CREATE_UNLOCK(inp);
12622                         create_lock_applied = false;
12623                 }
12624                 if (error != 0) {
12625                         goto out_unlocked;
12626                 }
12627                 if (t_inp != inp) {
12628                         error = ENOTCONN;
12629                         goto out_unlocked;
12630                 }
12631         }
12632         if (stcb == NULL) {
12633                 if (addr == NULL) {
12634                         error = ENOENT;
12635                         goto out_unlocked;
12636                 } else {
12637                         /* We must go ahead and start the INIT process */
12638                         uint32_t vrf_id;
12639
12640                         if ((sinfo_flags & SCTP_ABORT) ||
12641                             ((sinfo_flags & SCTP_EOF) && (sndlen == 0))) {
12642                                 /*-
12643                                  * User asks to abort a non-existent assoc,
12644                                  * or EOF a non-existent assoc with no data
12645                                  */
12646                                 error = ENOENT;
12647                                 goto out_unlocked;
12648                         }
12649                         /* get an asoc/stcb struct */
12650                         vrf_id = inp->def_vrf_id;
12651                         KASSERT(create_lock_applied, ("create_lock_applied is false"));
12652                         stcb = sctp_aloc_assoc_connected(inp, addr, &error, 0, 0, vrf_id,
12653                             inp->sctp_ep.pre_open_stream_count,
12654                             inp->sctp_ep.port,
12655                             p,
12656                             SCTP_INITIALIZE_AUTH_PARAMS);
12657                         if (stcb == NULL) {
12658                                 /* error is setup for us in the call. */
12659                                 KASSERT(error != 0, ("error is 0 although stcb is NULL"));
12660                                 goto out_unlocked;
12661                         }
12662                         SCTP_TCB_LOCK_ASSERT(stcb);
12663                         SCTP_ASOC_CREATE_UNLOCK(inp);
12664                         create_lock_applied = false;
12665                         /*
12666                          * Turn on queue only flag to prevent data from
12667                          * being sent
12668                          */
12669                         queue_only = 1;
12670                         SCTP_SET_STATE(stcb, SCTP_STATE_COOKIE_WAIT);
12671                         (void)SCTP_GETTIME_TIMEVAL(&stcb->asoc.time_entered);
12672                         if (control != NULL) {
12673                                 if (sctp_process_cmsgs_for_init(stcb, control, &error)) {
12674                                         sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
12675                                             SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_6);
12676                                         stcb = NULL;
12677                                         KASSERT(error != 0,
12678                                             ("error is 0 although sctp_process_cmsgs_for_init() indicated an error"));
12679                                         goto out_unlocked;
12680                                 }
12681                         }
12682                         /* out with the INIT */
12683                         queue_only_for_init = 1;
12684                         /*-
12685                          * we may want to dig in after this call and adjust the MTU
12686                          * value. It defaulted to 1500 (constant) but the ro
12687                          * structure may now have an update and thus we may need to
12688                          * change it BEFORE we append the message.
12689                          */
12690                 }
12691         }
12692
12693         KASSERT(!create_lock_applied, ("create_lock_applied is true"));
12694         KASSERT(stcb != NULL, ("stcb is NULL"));
12695         SCTP_TCB_LOCK_ASSERT(stcb);
12696
12697         asoc = &stcb->asoc;
12698         if ((asoc->state & SCTP_STATE_ABOUT_TO_BE_FREED) ||
12699             (asoc->state & SCTP_STATE_WAS_ABORTED)) {
12700                 if (asoc->state & SCTP_STATE_WAS_ABORTED) {
12701                         /* XXX: Could also be ECONNABORTED, not enough info. */
12702                         error = ECONNRESET;
12703                 } else {
12704                         error = ENOTCONN;
12705                 }
12706                 goto out_unlocked;
12707         }
12708         if ((SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_WAIT) ||
12709             (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)) {
12710                 queue_only = 1;
12711         }
12712         /* Keep the stcb from being freed under our feet. */
12713         atomic_add_int(&asoc->refcnt, 1);
12714         free_cnt_applied = true;
12715         if (sndrcvninfo == NULL) {
12716                 /* Use a local copy to have a consistent view. */
12717                 sndrcvninfo_buf = asoc->def_send;
12718                 sndrcvninfo = &sndrcvninfo_buf;
12719                 sinfo_flags = sndrcvninfo->sinfo_flags;
12720                 if (flags & MSG_EOR) {
12721                         sinfo_flags |= SCTP_EOR;
12722                 }
12723                 if (flags & MSG_EOF) {
12724                         sinfo_flags |= SCTP_EOF;
12725                 }
12726         }
12727         if (sinfo_flags & SCTP_ADDR_OVER) {
12728                 if (addr != NULL) {
12729                         net = sctp_findnet(stcb, addr);
12730                 } else {
12731                         net = NULL;
12732                 }
12733                 if ((net == NULL) ||
12734                     ((port != 0) && (port != stcb->rport))) {
12735                         error = EINVAL;
12736                         goto out_unlocked;
12737                 }
12738         } else {
12739                 if (asoc->alternate != NULL) {
12740                         net = asoc->alternate;
12741                 } else {
12742                         net = asoc->primary_destination;
12743                 }
12744         }
12745         sinfo_stream = sndrcvninfo->sinfo_stream;
12746         /* Is the stream no. valid? */
12747         if (sinfo_stream >= asoc->streamoutcnt) {
12748                 /* Invalid stream number */
12749                 error = EINVAL;
12750                 goto out_unlocked;
12751         }
12752         if ((asoc->strmout[sinfo_stream].state != SCTP_STREAM_OPEN) &&
12753             (asoc->strmout[sinfo_stream].state != SCTP_STREAM_OPENING)) {
12754                 /*
12755                  * Can't queue any data while stream reset is underway.
12756                  */
12757                 if (asoc->strmout[sinfo_stream].state > SCTP_STREAM_OPEN) {
12758                         error = EAGAIN;
12759                 } else {
12760                         error = EINVAL;
12761                 }
12762                 goto out_unlocked;
12763         }
12764         if (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_NO_FRAGMENT)) {
12765                 if (sndlen > (ssize_t)asoc->smallest_mtu) {
12766                         error = EMSGSIZE;
12767                         goto out_unlocked;
12768                 }
12769         }
12770         atomic_add_int(&stcb->total_sends, 1);
12771         if (SCTP_SO_IS_NBIO(so) || (flags & (MSG_NBIO | MSG_DONTWAIT)) != 0) {
12772                 non_blocking = true;
12773         }
12774         if (non_blocking) {
12775                 ssize_t amount;
12776
12777                 inqueue_bytes = asoc->total_output_queue_size - (asoc->chunks_on_out_queue * SCTP_DATA_CHUNK_OVERHEAD(stcb));
12778                 if (user_marks_eor == 0) {
12779                         amount = sndlen;
12780                 } else {
12781                         amount = 1;
12782                 }
12783                 if ((SCTP_SB_LIMIT_SND(so) < (amount + inqueue_bytes + asoc->sb_send_resv)) ||
12784                     (asoc->chunks_on_out_queue >= SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue))) {
12785                         if ((sndlen > (ssize_t)SCTP_SB_LIMIT_SND(so)) &&
12786                             (user_marks_eor == 0)) {
12787                                 error = EMSGSIZE;
12788                         } else {
12789                                 error = EWOULDBLOCK;
12790                         }
12791                         goto out_unlocked;
12792                 }
12793         }
12794         atomic_add_int(&asoc->sb_send_resv, (int)sndlen);
12795         local_soresv = sndlen;
12796
12797         KASSERT(stcb != NULL, ("stcb is NULL"));
12798         SCTP_TCB_LOCK_ASSERT(stcb);
12799         KASSERT((asoc->state & SCTP_STATE_ABOUT_TO_BE_FREED) == 0,
12800             ("Association about to be freed"));
12801         KASSERT((asoc->state & SCTP_STATE_WAS_ABORTED) == 0,
12802             ("Association was aborted"));
12803
12804         /* Are we aborting? */
12805         if (sinfo_flags & SCTP_ABORT) {
12806                 struct mbuf *mm;
12807                 struct sctp_paramhdr *ph;
12808                 ssize_t tot_demand, tot_out = 0, max_out;
12809
12810                 SCTP_STAT_INCR(sctps_sends_with_abort);
12811                 if ((SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_WAIT) ||
12812                     (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)) {
12813                         /* It has to be up before we abort. */
12814                         error = EINVAL;
12815                         goto out_unlocked;
12816                 }
12817                 /* How big is the user initiated abort? */
12818                 if (top != NULL) {
12819                         struct mbuf *cntm;
12820
12821                         if (sndlen != 0) {
12822                                 for (cntm = top; cntm; cntm = SCTP_BUF_NEXT(cntm)) {
12823                                         tot_out += SCTP_BUF_LEN(cntm);
12824                                 }
12825                         }
12826                         mm = sctp_get_mbuf_for_msg(sizeof(struct sctp_paramhdr), 0, M_NOWAIT, 1, MT_DATA);
12827                 } else {
12828                         /* Must fit in a MTU */
12829                         tot_out = sndlen;
12830                         tot_demand = (tot_out + sizeof(struct sctp_paramhdr));
12831                         if (tot_demand > SCTP_DEFAULT_ADD_MORE) {
12832                                 error = EMSGSIZE;
12833                                 goto out_unlocked;
12834                         }
12835                         mm = sctp_get_mbuf_for_msg((unsigned int)tot_demand, 0, M_NOWAIT, 1, MT_DATA);
12836                 }
12837                 if (mm == NULL) {
12838                         error = ENOMEM;
12839                         goto out_unlocked;
12840                 }
12841                 max_out = asoc->smallest_mtu - sizeof(struct sctp_paramhdr);
12842                 max_out -= sizeof(struct sctp_abort_msg);
12843                 if (tot_out > max_out) {
12844                         tot_out = max_out;
12845                 }
12846                 ph = mtod(mm, struct sctp_paramhdr *);
12847                 ph->param_type = htons(SCTP_CAUSE_USER_INITIATED_ABT);
12848                 ph->param_length = htons((uint16_t)(sizeof(struct sctp_paramhdr) + tot_out));
12849                 ph++;
12850                 SCTP_BUF_LEN(mm) = (int)(tot_out + sizeof(struct sctp_paramhdr));
12851                 if (top == NULL) {
12852                         SCTP_TCB_UNLOCK(stcb);
12853                         error = uiomove((caddr_t)ph, (int)tot_out, uio);
12854                         SCTP_TCB_LOCK(stcb);
12855                         if ((asoc->state & SCTP_STATE_ABOUT_TO_BE_FREED) ||
12856                             (asoc->state & SCTP_STATE_WAS_ABORTED)) {
12857                                 sctp_m_freem(mm);
12858                                 if (asoc->state & SCTP_STATE_WAS_ABORTED) {
12859                                         /*
12860                                          * XXX: Could also be ECONNABORTED,
12861                                          * not enough info.
12862                                          */
12863                                         error = ECONNRESET;
12864                                 } else {
12865                                         error = ENOTCONN;
12866                                 }
12867                                 goto out_unlocked;
12868                         }
12869                         if (error != 0) {
12870                                 /*-
12871                                  * Here if we can't get his data we
12872                                  * still abort we just don't get to
12873                                  * send the users note :-0
12874                                  */
12875                                 sctp_m_freem(mm);
12876                                 mm = NULL;
12877                                 error = 0;
12878                         }
12879                 } else {
12880                         if (sndlen != 0) {
12881                                 SCTP_BUF_NEXT(mm) = top;
12882                         }
12883                 }
12884                 atomic_subtract_int(&asoc->refcnt, 1);
12885                 free_cnt_applied = false;
12886                 /* release this lock, otherwise we hang on ourselves */
12887                 NET_EPOCH_ENTER(et);
12888                 sctp_abort_an_association(stcb->sctp_ep, stcb, mm, false, SCTP_SO_LOCKED);
12889                 NET_EPOCH_EXIT(et);
12890                 stcb = NULL;
12891                 /*
12892                  * In this case top is already chained to mm avoid double
12893                  * free, since we free it below if top != NULL and driver
12894                  * would free it after sending the packet out
12895                  */
12896                 if (sndlen != 0) {
12897                         top = NULL;
12898                 }
12899                 goto out_unlocked;
12900         }
12901
12902         KASSERT(stcb != NULL, ("stcb is NULL"));
12903         SCTP_TCB_LOCK_ASSERT(stcb);
12904         KASSERT((asoc->state & SCTP_STATE_ABOUT_TO_BE_FREED) == 0,
12905             ("Association about to be freed"));
12906         KASSERT((asoc->state & SCTP_STATE_WAS_ABORTED) == 0,
12907             ("Association was aborted"));
12908
12909         /* Ok, we will attempt a msgsnd :> */
12910         if (p != NULL) {
12911                 p->td_ru.ru_msgsnd++;
12912         }
12913
12914         /* Calculate the maximum we can send */
12915         inqueue_bytes = asoc->total_output_queue_size - (asoc->chunks_on_out_queue * SCTP_DATA_CHUNK_OVERHEAD(stcb));
12916         if (SCTP_SB_LIMIT_SND(so) > inqueue_bytes) {
12917                 max_len = SCTP_SB_LIMIT_SND(so) - inqueue_bytes;
12918         } else {
12919                 max_len = 0;
12920         }
12921         /* Unless E_EOR mode is on, we must make a send FIT in one call. */
12922         if ((user_marks_eor == 0) &&
12923             (sndlen > (ssize_t)SCTP_SB_LIMIT_SND(stcb->sctp_socket))) {
12924                 /* It will NEVER fit. */
12925                 error = EMSGSIZE;
12926                 goto out_unlocked;
12927         }
12928         if (user_marks_eor != 0) {
12929                 local_add_more = (ssize_t)min(SCTP_SB_LIMIT_SND(so), SCTP_BASE_SYSCTL(sctp_add_more_threshold));
12930         } else {
12931                 /*-
12932                  * For non-eeor the whole message must fit in
12933                  * the socket send buffer.
12934                  */
12935                 local_add_more = sndlen;
12936         }
12937         if (non_blocking) {
12938                 goto skip_preblock;
12939         }
12940         if (((max_len <= local_add_more) && ((ssize_t)SCTP_SB_LIMIT_SND(so) >= local_add_more)) ||
12941             (max_len == 0) ||
12942             ((asoc->chunks_on_out_queue + asoc->stream_queue_cnt) >= SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue))) {
12943                 /* No room right now! */
12944                 inqueue_bytes = asoc->total_output_queue_size - (asoc->chunks_on_out_queue * SCTP_DATA_CHUNK_OVERHEAD(stcb));
12945                 SOCKBUF_LOCK(&so->so_snd);
12946                 while ((SCTP_SB_LIMIT_SND(so) < (inqueue_bytes + local_add_more)) ||
12947                     ((asoc->stream_queue_cnt + asoc->chunks_on_out_queue) >= SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue))) {
12948                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "pre_block limit:%u <(inq:%d + %zd) || (%d+%d > %d)\n",
12949                             (unsigned int)SCTP_SB_LIMIT_SND(so),
12950                             inqueue_bytes,
12951                             local_add_more,
12952                             asoc->stream_queue_cnt,
12953                             asoc->chunks_on_out_queue,
12954                             SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue));
12955                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
12956                                 sctp_log_block(SCTP_BLOCK_LOG_INTO_BLKA, asoc, sndlen);
12957                         }
12958                         be.error = 0;
12959                         stcb->block_entry = &be;
12960                         SCTP_TCB_UNLOCK(stcb);
12961                         error = sbwait(&so->so_snd);
12962                         if (error == 0) {
12963                                 if (so->so_error != 0) {
12964                                         error = so->so_error;
12965                                 }
12966                                 if (be.error != 0) {
12967                                         error = be.error;
12968                                 }
12969                         }
12970                         SOCKBUF_UNLOCK(&so->so_snd);
12971                         SCTP_TCB_LOCK(stcb);
12972                         stcb->block_entry = NULL;
12973                         if (error != 0) {
12974                                 goto out_unlocked;
12975                         }
12976                         if ((asoc->state & SCTP_STATE_ABOUT_TO_BE_FREED) ||
12977                             (asoc->state & SCTP_STATE_WAS_ABORTED)) {
12978                                 if (asoc->state & SCTP_STATE_WAS_ABORTED) {
12979                                         /*
12980                                          * XXX: Could also be ECONNABORTED,
12981                                          * not enough info.
12982                                          */
12983                                         error = ECONNRESET;
12984                                 } else {
12985                                         error = ENOTCONN;
12986                                 }
12987                                 goto out_unlocked;
12988                         }
12989                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
12990                                 sctp_log_block(SCTP_BLOCK_LOG_OUTOF_BLK,
12991                                     asoc, asoc->total_output_queue_size);
12992                         }
12993                         inqueue_bytes = asoc->total_output_queue_size - (asoc->chunks_on_out_queue * SCTP_DATA_CHUNK_OVERHEAD(stcb));
12994                         SOCKBUF_LOCK(&so->so_snd);
12995                 }
12996                 if (SCTP_SB_LIMIT_SND(so) > inqueue_bytes) {
12997                         max_len = SCTP_SB_LIMIT_SND(so) - inqueue_bytes;
12998                 } else {
12999                         max_len = 0;
13000                 }
13001                 SOCKBUF_UNLOCK(&so->so_snd);
13002         }
13003
13004 skip_preblock:
13005         KASSERT(stcb != NULL, ("stcb is NULL"));
13006         SCTP_TCB_LOCK_ASSERT(stcb);
13007         KASSERT((asoc->state & SCTP_STATE_ABOUT_TO_BE_FREED) == 0,
13008             ("Association about to be freed"));
13009         KASSERT((asoc->state & SCTP_STATE_WAS_ABORTED) == 0,
13010             ("Association was aborted"));
13011
13012         /*
13013          * sndlen covers for mbuf case uio_resid covers for the non-mbuf
13014          * case NOTE: uio will be null when top/mbuf is passed
13015          */
13016         if (sndlen == 0) {
13017                 if (sinfo_flags & SCTP_EOF) {
13018                         got_all_of_the_send = true;
13019                         goto dataless_eof;
13020                 } else {
13021                         error = EINVAL;
13022                         goto out;
13023                 }
13024         }
13025
13026         if (top == NULL) {
13027                 struct sctp_stream_queue_pending *sp;
13028                 struct sctp_stream_out *strm;
13029                 uint32_t sndout;
13030
13031                 if ((asoc->stream_locked) &&
13032                     (asoc->stream_locked_on != sinfo_stream)) {
13033                         error = EINVAL;
13034                         goto out;
13035                 }
13036                 strm = &asoc->strmout[sinfo_stream];
13037                 if (strm->last_msg_incomplete == 0) {
13038         do_a_copy_in:
13039                         SCTP_TCB_UNLOCK(stcb);
13040                         sp = sctp_copy_it_in(stcb, asoc, sndrcvninfo, uio, net, max_len, user_marks_eor, &error);
13041                         SCTP_TCB_LOCK(stcb);
13042                         if ((asoc->state & SCTP_STATE_ABOUT_TO_BE_FREED) ||
13043                             (asoc->state & SCTP_STATE_WAS_ABORTED)) {
13044                                 if (asoc->state & SCTP_STATE_WAS_ABORTED) {
13045                                         /*
13046                                          * XXX: Could also be ECONNABORTED,
13047                                          * not enough info.
13048                                          */
13049                                         error = ECONNRESET;
13050                                 } else {
13051                                         error = ENOTCONN;
13052                                 }
13053                                 goto out;
13054                         }
13055                         if (error != 0) {
13056                                 goto out;
13057                         }
13058                         /*
13059                          * Reject the sending of a new user message, if the
13060                          * association is about to be shut down.
13061                          */
13062                         if ((SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_SENT) ||
13063                             (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_RECEIVED) ||
13064                             (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_ACK_SENT) ||
13065                             (asoc->state & SCTP_STATE_SHUTDOWN_PENDING)) {
13066                                 if (sp->data != 0) {
13067                                         sctp_m_freem(sp->data);
13068                                         sp->data = NULL;
13069                                         sp->tail_mbuf = NULL;
13070                                         sp->length = 0;
13071                                 }
13072                                 if (sp->net != NULL) {
13073                                         sctp_free_remote_addr(sp->net);
13074                                         sp->net = NULL;
13075                                 }
13076                                 sctp_free_a_strmoq(stcb, sp, SCTP_SO_LOCKED);
13077                                 error = EPIPE;
13078                                 goto out_unlocked;
13079                         }
13080                         /* The out streams might be reallocated. */
13081                         strm = &asoc->strmout[sinfo_stream];
13082                         if (sp->msg_is_complete) {
13083                                 strm->last_msg_incomplete = 0;
13084                                 asoc->stream_locked = 0;
13085                         } else {
13086                                 /*
13087                                  * Just got locked to this guy in case of an
13088                                  * interrupt.
13089                                  */
13090                                 strm->last_msg_incomplete = 1;
13091                                 if (asoc->idata_supported == 0) {
13092                                         asoc->stream_locked = 1;
13093                                         asoc->stream_locked_on = sinfo_stream;
13094                                 }
13095                                 sp->sender_all_done = 0;
13096                         }
13097                         sctp_snd_sb_alloc(stcb, sp->length);
13098                         atomic_add_int(&asoc->stream_queue_cnt, 1);
13099                         if (sinfo_flags & SCTP_UNORDERED) {
13100                                 SCTP_STAT_INCR(sctps_sends_with_unord);
13101                         }
13102                         sp->processing = 1;
13103                         TAILQ_INSERT_TAIL(&strm->outqueue, sp, next);
13104                         asoc->ss_functions.sctp_ss_add_to_stream(stcb, asoc, strm, sp);
13105                 } else {
13106                         sp = TAILQ_LAST(&strm->outqueue, sctp_streamhead);
13107                         if (sp == NULL) {
13108                                 /* ???? Huh ??? last msg is gone */
13109 #ifdef INVARIANTS
13110                                 panic("Warning: Last msg marked incomplete, yet nothing left?");
13111 #else
13112                                 SCTP_PRINTF("Warning: Last msg marked incomplete, yet nothing left?\n");
13113                                 strm->last_msg_incomplete = 0;
13114 #endif
13115                                 goto do_a_copy_in;
13116                         }
13117                         if (sp->processing != 0) {
13118                                 error = EINVAL;
13119                                 goto out;
13120                         } else {
13121                                 sp->processing = 1;
13122                         }
13123                 }
13124
13125                 KASSERT(stcb != NULL, ("stcb is NULL"));
13126                 SCTP_TCB_LOCK_ASSERT(stcb);
13127                 KASSERT((asoc->state & SCTP_STATE_ABOUT_TO_BE_FREED) == 0,
13128                     ("Association about to be freed"));
13129                 KASSERT((asoc->state & SCTP_STATE_WAS_ABORTED) == 0,
13130                     ("Association was aborted"));
13131
13132                 while (uio->uio_resid > 0) {
13133                         /* How much room do we have? */
13134                         struct mbuf *new_tail, *mm;
13135
13136                         inqueue_bytes = asoc->total_output_queue_size - (asoc->chunks_on_out_queue * SCTP_DATA_CHUNK_OVERHEAD(stcb));
13137                         if (SCTP_SB_LIMIT_SND(so) > inqueue_bytes) {
13138                                 max_len = SCTP_SB_LIMIT_SND(so) - inqueue_bytes;
13139                         } else {
13140                                 max_len = 0;
13141                         }
13142                         if ((max_len > (ssize_t)SCTP_BASE_SYSCTL(sctp_add_more_threshold)) ||
13143                             ((max_len > 0) && (SCTP_SB_LIMIT_SND(so) < SCTP_BASE_SYSCTL(sctp_add_more_threshold))) ||
13144                             (uio->uio_resid <= max_len)) {
13145                                 SCTP_TCB_UNLOCK(stcb);
13146                                 sndout = 0;
13147                                 new_tail = NULL;
13148                                 mm = sctp_copy_resume(uio, (int)max_len, user_marks_eor, &error, &sndout, &new_tail);
13149                                 SCTP_TCB_LOCK(stcb);
13150                                 if ((asoc->state & SCTP_STATE_ABOUT_TO_BE_FREED) ||
13151                                     (asoc->state & SCTP_STATE_WAS_ABORTED)) {
13152                                         /*
13153                                          * We need to get out. Peer probably
13154                                          * aborted.
13155                                          */
13156                                         sctp_m_freem(mm);
13157                                         if (asoc->state & SCTP_STATE_WAS_ABORTED) {
13158                                                 /*
13159                                                  * XXX: Could also be
13160                                                  * ECONNABORTED, not enough
13161                                                  * info.
13162                                                  */
13163                                                 error = ECONNRESET;
13164                                         } else {
13165                                                 error = ENOTCONN;
13166                                         }
13167                                         goto out;
13168                                 }
13169                                 if ((mm == NULL) || (error != 0)) {
13170                                         if (mm != NULL) {
13171                                                 sctp_m_freem(mm);
13172                                         }
13173                                         if (sp != NULL) {
13174                                                 sp->processing = 0;
13175                                         }
13176                                         goto out;
13177                                 }
13178                                 /* Update the mbuf and count */
13179                                 if (sp->tail_mbuf != NULL) {
13180                                         /* Tack it to the end. */
13181                                         SCTP_BUF_NEXT(sp->tail_mbuf) = mm;
13182                                 } else {
13183                                         /* A stolen mbuf. */
13184                                         sp->data = mm;
13185                                 }
13186                                 sp->tail_mbuf = new_tail;
13187                                 sctp_snd_sb_alloc(stcb, sndout);
13188                                 atomic_add_int(&sp->length, sndout);
13189                                 if (sinfo_flags & SCTP_SACK_IMMEDIATELY) {
13190                                         sp->sinfo_flags |= SCTP_SACK_IMMEDIATELY;
13191                                 }
13192
13193                                 /* Did we reach EOR? */
13194                                 if ((uio->uio_resid == 0) &&
13195                                     ((user_marks_eor == 0) ||
13196                                     (sinfo_flags & SCTP_EOF) ||
13197                                     (user_marks_eor && (sinfo_flags & SCTP_EOR)))) {
13198                                         sp->msg_is_complete = 1;
13199                                 } else {
13200                                         sp->msg_is_complete = 0;
13201                                 }
13202                         }
13203
13204                         KASSERT(stcb != NULL, ("stcb is NULL"));
13205                         SCTP_TCB_LOCK_ASSERT(stcb);
13206                         KASSERT((asoc->state & SCTP_STATE_ABOUT_TO_BE_FREED) == 0,
13207                             ("Association about to be freed"));
13208                         KASSERT((asoc->state & SCTP_STATE_WAS_ABORTED) == 0,
13209                             ("Association was aborted"));
13210
13211                         if (uio->uio_resid == 0) {
13212                                 /* got it all? */
13213                                 continue;
13214                         }
13215                         /* PR-SCTP? */
13216                         if ((asoc->prsctp_supported) && (asoc->sent_queue_cnt_removeable > 0)) {
13217                                 /*
13218                                  * This is ugly but we must assure locking
13219                                  * order
13220                                  */
13221                                 sctp_prune_prsctp(stcb, asoc, sndrcvninfo, (int)sndlen);
13222                                 inqueue_bytes = asoc->total_output_queue_size - (asoc->chunks_on_out_queue * SCTP_DATA_CHUNK_OVERHEAD(stcb));
13223                                 if (SCTP_SB_LIMIT_SND(so) > inqueue_bytes)
13224                                         max_len = SCTP_SB_LIMIT_SND(so) - inqueue_bytes;
13225                                 else
13226                                         max_len = 0;
13227                                 if (max_len > 0) {
13228                                         continue;
13229                                 }
13230                         }
13231                         /* wait for space now */
13232                         if (non_blocking) {
13233                                 /* Non-blocking io in place out */
13234                                 if (sp != NULL) {
13235                                         sp->processing = 0;
13236                                 }
13237                                 goto skip_out_eof;
13238                         }
13239                         /* What about the INIT, send it maybe */
13240                         if (queue_only_for_init) {
13241                                 if (SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) {
13242                                         /* a collision took us forward? */
13243                                         queue_only = 0;
13244                                 } else {
13245                                         NET_EPOCH_ENTER(et);
13246                                         sctp_send_initiate(inp, stcb, SCTP_SO_LOCKED);
13247                                         NET_EPOCH_EXIT(et);
13248                                         SCTP_SET_STATE(stcb, SCTP_STATE_COOKIE_WAIT);
13249                                         queue_only = 1;
13250                                 }
13251                         }
13252                         if ((net->flight_size > net->cwnd) &&
13253                             (asoc->sctp_cmt_on_off == 0)) {
13254                                 SCTP_STAT_INCR(sctps_send_cwnd_avoid);
13255                                 queue_only = 1;
13256                         } else if (asoc->ifp_had_enobuf) {
13257                                 SCTP_STAT_INCR(sctps_ifnomemqueued);
13258                                 if (net->flight_size > (2 * net->mtu)) {
13259                                         queue_only = 1;
13260                                 }
13261                                 asoc->ifp_had_enobuf = 0;
13262                         }
13263                         un_sent = asoc->total_output_queue_size - asoc->total_flight;
13264                         if ((sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY)) &&
13265                             (asoc->total_flight > 0) &&
13266                             (asoc->stream_queue_cnt < SCTP_MAX_DATA_BUNDLING) &&
13267                             (un_sent < (int)(asoc->smallest_mtu - SCTP_MIN_OVERHEAD))) {
13268                                 /*-
13269                                  * Ok, Nagle is set on and we have data outstanding.
13270                                  * Don't send anything and let SACKs drive out the
13271                                  * data unless we have a "full" segment to send.
13272                                  */
13273                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
13274                                         sctp_log_nagle_event(stcb, SCTP_NAGLE_APPLIED);
13275                                 }
13276                                 SCTP_STAT_INCR(sctps_naglequeued);
13277                                 nagle_applies = 1;
13278                         } else {
13279                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
13280                                         if (sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY))
13281                                                 sctp_log_nagle_event(stcb, SCTP_NAGLE_SKIPPED);
13282                                 }
13283                                 SCTP_STAT_INCR(sctps_naglesent);
13284                                 nagle_applies = 0;
13285                         }
13286                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13287                                 sctp_misc_ints(SCTP_CWNDLOG_PRESEND, queue_only_for_init, queue_only,
13288                                     nagle_applies, un_sent);
13289                                 sctp_misc_ints(SCTP_CWNDLOG_PRESEND, asoc->total_output_queue_size,
13290                                     asoc->total_flight,
13291                                     asoc->chunks_on_out_queue, asoc->total_flight_count);
13292                         }
13293                         if (queue_only_for_init) {
13294                                 queue_only_for_init = 0;
13295                         }
13296                         if ((queue_only == 0) && (nagle_applies == 0)) {
13297                                 /*-
13298                                  * need to start chunk output
13299                                  * before blocking.. note that if
13300                                  * a lock is already applied, then
13301                                  * the input via the net is happening
13302                                  * and I don't need to start output :-D
13303                                  */
13304                                 NET_EPOCH_ENTER(et);
13305                                 sctp_chunk_output(inp, stcb,
13306                                     SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13307                                 NET_EPOCH_EXIT(et);
13308                         }
13309                         /*-
13310                          * This is a bit strange, but I think it will
13311                          * work. The total_output_queue_size is locked and
13312                          * protected by the TCB_LOCK, which we just released.
13313                          * There is a race that can occur between releasing it
13314                          * above, and me getting the socket lock, where sacks
13315                          * come in but we have not put the SB_WAIT on the
13316                          * so_snd buffer to get the wakeup. After the LOCK
13317                          * is applied the sack_processing will also need to
13318                          * LOCK the so->so_snd to do the actual sowwakeup(). So
13319                          * once we have the socket buffer lock if we recheck the
13320                          * size we KNOW we will get to sleep safely with the
13321                          * wakeup flag in place.
13322                          */
13323                         inqueue_bytes = asoc->total_output_queue_size - (asoc->chunks_on_out_queue * SCTP_DATA_CHUNK_OVERHEAD(stcb));
13324                         SOCKBUF_LOCK(&so->so_snd);
13325                         if (SCTP_SB_LIMIT_SND(so) <= (inqueue_bytes +
13326                             min(SCTP_BASE_SYSCTL(sctp_add_more_threshold), SCTP_SB_LIMIT_SND(so)))) {
13327                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13328                                         sctp_log_block(SCTP_BLOCK_LOG_INTO_BLK,
13329                                             asoc, uio->uio_resid);
13330                                 }
13331                                 be.error = 0;
13332                                 stcb->block_entry = &be;
13333                                 SCTP_TCB_UNLOCK(stcb);
13334                                 error = sbwait(&so->so_snd);
13335                                 if (error == 0) {
13336                                         if (so->so_error != 0)
13337                                                 error = so->so_error;
13338                                         if (be.error != 0) {
13339                                                 error = be.error;
13340                                         }
13341                                 }
13342                                 SOCKBUF_UNLOCK(&so->so_snd);
13343                                 SCTP_TCB_LOCK(stcb);
13344                                 stcb->block_entry = NULL;
13345                                 if ((asoc->state & SCTP_STATE_ABOUT_TO_BE_FREED) ||
13346                                     (asoc->state & SCTP_STATE_WAS_ABORTED)) {
13347                                         if (asoc->state & SCTP_STATE_WAS_ABORTED) {
13348                                                 /*
13349                                                  * XXX: Could also be
13350                                                  * ECONNABORTED, not enough
13351                                                  * info.
13352                                                  */
13353                                                 error = ECONNRESET;
13354                                         } else {
13355                                                 error = ENOTCONN;
13356                                         }
13357                                         goto out_unlocked;
13358                                 }
13359                                 if (error != 0) {
13360                                         if (sp != NULL) {
13361                                                 sp->processing = 0;
13362                                         }
13363                                         goto out_unlocked;
13364                                 }
13365                         } else {
13366                                 SOCKBUF_UNLOCK(&so->so_snd);
13367                         }
13368                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13369                                 sctp_log_block(SCTP_BLOCK_LOG_OUTOF_BLK,
13370                                     asoc, asoc->total_output_queue_size);
13371                         }
13372                 }
13373
13374                 KASSERT(stcb != NULL, ("stcb is NULL"));
13375                 SCTP_TCB_LOCK_ASSERT(stcb);
13376                 KASSERT((asoc->state & SCTP_STATE_ABOUT_TO_BE_FREED) == 0,
13377                     ("Association about to be freed"));
13378                 KASSERT((asoc->state & SCTP_STATE_WAS_ABORTED) == 0,
13379                     ("Association was aborted"));
13380
13381                 /* The out streams might be reallocated. */
13382                 strm = &asoc->strmout[sinfo_stream];
13383                 if (sp != NULL) {
13384                         if (sp->msg_is_complete == 0) {
13385                                 strm->last_msg_incomplete = 1;
13386                                 if (asoc->idata_supported == 0) {
13387                                         asoc->stream_locked = 1;
13388                                         asoc->stream_locked_on = sinfo_stream;
13389                                 }
13390                         } else {
13391                                 sp->sender_all_done = 1;
13392                                 strm->last_msg_incomplete = 0;
13393                                 asoc->stream_locked = 0;
13394                         }
13395                         sp->processing = 0;
13396                 } else {
13397                         SCTP_PRINTF("Huh no sp TSNH?\n");
13398                         strm->last_msg_incomplete = 0;
13399                         asoc->stream_locked = 0;
13400                 }
13401                 if (uio->uio_resid == 0) {
13402                         got_all_of_the_send = true;
13403                 }
13404         } else {
13405                 error = sctp_msg_append(stcb, net, top, sndrcvninfo);
13406                 top = NULL;
13407                 if ((sinfo_flags & SCTP_EOF) != 0) {
13408                         got_all_of_the_send = true;
13409                 }
13410         }
13411         if (error != 0) {
13412                 goto out;
13413         }
13414
13415 dataless_eof:
13416         KASSERT(stcb != NULL, ("stcb is NULL"));
13417         SCTP_TCB_LOCK_ASSERT(stcb);
13418         KASSERT((asoc->state & SCTP_STATE_ABOUT_TO_BE_FREED) == 0,
13419             ("Association about to be freed"));
13420         KASSERT((asoc->state & SCTP_STATE_WAS_ABORTED) == 0,
13421             ("Association was aborted"));
13422
13423         /* EOF thing ? */
13424         if ((sinfo_flags & SCTP_EOF) && got_all_of_the_send) {
13425                 SCTP_STAT_INCR(sctps_sends_with_eof);
13426                 error = 0;
13427                 if (TAILQ_EMPTY(&asoc->send_queue) &&
13428                     TAILQ_EMPTY(&asoc->sent_queue) &&
13429                     sctp_is_there_unsent_data(stcb, SCTP_SO_LOCKED) == 0) {
13430                         if ((*asoc->ss_functions.sctp_ss_is_user_msgs_incomplete) (stcb, asoc)) {
13431                                 goto abort_anyway;
13432                         }
13433                         /* there is nothing queued to send, so I'm done... */
13434                         if ((SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_SENT) &&
13435                             (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
13436                             (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
13437                                 struct sctp_nets *netp;
13438
13439                                 /* only send SHUTDOWN the first time through */
13440                                 if (SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) {
13441                                         SCTP_STAT_DECR_GAUGE32(sctps_currestab);
13442                                 }
13443                                 SCTP_SET_STATE(stcb, SCTP_STATE_SHUTDOWN_SENT);
13444                                 sctp_stop_timers_for_shutdown(stcb);
13445                                 if (asoc->alternate != NULL) {
13446                                         netp = asoc->alternate;
13447                                 } else {
13448                                         netp = asoc->primary_destination;
13449                                 }
13450                                 sctp_send_shutdown(stcb, netp);
13451                                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb,
13452                                     netp);
13453                                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
13454                                     NULL);
13455                         }
13456                 } else {
13457                         /*-
13458                          * we still got (or just got) data to send, so set
13459                          * SHUTDOWN_PENDING
13460                          */
13461                         /*-
13462                          * XXX sockets draft says that SCTP_EOF should be
13463                          * sent with no data.  currently, we will allow user
13464                          * data to be sent first and move to
13465                          * SHUTDOWN-PENDING
13466                          */
13467                         if ((SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_SENT) &&
13468                             (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
13469                             (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
13470                                 if ((*asoc->ss_functions.sctp_ss_is_user_msgs_incomplete) (stcb, asoc)) {
13471                                         SCTP_ADD_SUBSTATE(stcb, SCTP_STATE_PARTIAL_MSG_LEFT);
13472                                 }
13473                                 SCTP_ADD_SUBSTATE(stcb, SCTP_STATE_SHUTDOWN_PENDING);
13474                                 if (TAILQ_EMPTY(&asoc->send_queue) &&
13475                                     TAILQ_EMPTY(&asoc->sent_queue) &&
13476                                     (asoc->state & SCTP_STATE_PARTIAL_MSG_LEFT)) {
13477                                         struct mbuf *op_err;
13478                                         char msg[SCTP_DIAG_INFO_LEN];
13479
13480                         abort_anyway:
13481                                         if (free_cnt_applied) {
13482                                                 atomic_subtract_int(&asoc->refcnt, 1);
13483                                                 free_cnt_applied = false;
13484                                         }
13485                                         SCTP_SNPRINTF(msg, sizeof(msg),
13486                                             "%s:%d at %s", __FILE__, __LINE__, __func__);
13487                                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
13488                                             msg);
13489                                         NET_EPOCH_ENTER(et);
13490                                         sctp_abort_an_association(stcb->sctp_ep, stcb,
13491                                             op_err, false, SCTP_SO_LOCKED);
13492                                         NET_EPOCH_EXIT(et);
13493                                         stcb = NULL;
13494                                         error = ECONNABORTED;
13495                                         goto out;
13496                                 }
13497                                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
13498                                     NULL);
13499                                 sctp_feature_off(inp, SCTP_PCB_FLAGS_NODELAY);
13500                         }
13501                 }
13502         }
13503
13504 skip_out_eof:
13505         KASSERT(stcb != NULL, ("stcb is NULL"));
13506         SCTP_TCB_LOCK_ASSERT(stcb);
13507         KASSERT((asoc->state & SCTP_STATE_ABOUT_TO_BE_FREED) == 0,
13508             ("Association about to be freed"));
13509         KASSERT((asoc->state & SCTP_STATE_WAS_ABORTED) == 0,
13510             ("Association was aborted"));
13511
13512         some_on_control = !TAILQ_EMPTY(&asoc->control_send_queue);
13513         if (queue_only_for_init) {
13514                 if (SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) {
13515                         /* a collision took us forward? */
13516                         queue_only = 0;
13517                 } else {
13518                         NET_EPOCH_ENTER(et);
13519                         sctp_send_initiate(inp, stcb, SCTP_SO_LOCKED);
13520                         NET_EPOCH_EXIT(et);
13521                         SCTP_SET_STATE(stcb, SCTP_STATE_COOKIE_WAIT);
13522                         queue_only = 1;
13523                 }
13524         }
13525
13526         KASSERT(stcb != NULL, ("stcb is NULL"));
13527         SCTP_TCB_LOCK_ASSERT(stcb);
13528         KASSERT((asoc->state & SCTP_STATE_ABOUT_TO_BE_FREED) == 0,
13529             ("Association about to be freed"));
13530         KASSERT((asoc->state & SCTP_STATE_WAS_ABORTED) == 0,
13531             ("Association was aborted"));
13532
13533         if ((net->flight_size > net->cwnd) &&
13534             (asoc->sctp_cmt_on_off == 0)) {
13535                 SCTP_STAT_INCR(sctps_send_cwnd_avoid);
13536                 queue_only = 1;
13537         } else if (asoc->ifp_had_enobuf) {
13538                 SCTP_STAT_INCR(sctps_ifnomemqueued);
13539                 if (net->flight_size > (2 * net->mtu)) {
13540                         queue_only = 1;
13541                 }
13542                 asoc->ifp_had_enobuf = 0;
13543         }
13544         un_sent = asoc->total_output_queue_size - asoc->total_flight;
13545         if ((sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY)) &&
13546             (asoc->total_flight > 0) &&
13547             (asoc->stream_queue_cnt < SCTP_MAX_DATA_BUNDLING) &&
13548             (un_sent < (int)(asoc->smallest_mtu - SCTP_MIN_OVERHEAD))) {
13549                 /*-
13550                  * Ok, Nagle is set on and we have data outstanding.
13551                  * Don't send anything and let SACKs drive out the
13552                  * data unless wen have a "full" segment to send.
13553                  */
13554                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
13555                         sctp_log_nagle_event(stcb, SCTP_NAGLE_APPLIED);
13556                 }
13557                 SCTP_STAT_INCR(sctps_naglequeued);
13558                 nagle_applies = 1;
13559         } else {
13560                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
13561                         if (sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY))
13562                                 sctp_log_nagle_event(stcb, SCTP_NAGLE_SKIPPED);
13563                 }
13564                 SCTP_STAT_INCR(sctps_naglesent);
13565                 nagle_applies = 0;
13566         }
13567         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13568                 sctp_misc_ints(SCTP_CWNDLOG_PRESEND, queue_only_for_init, queue_only,
13569                     nagle_applies, un_sent);
13570                 sctp_misc_ints(SCTP_CWNDLOG_PRESEND, asoc->total_output_queue_size,
13571                     asoc->total_flight,
13572                     asoc->chunks_on_out_queue, asoc->total_flight_count);
13573         }
13574
13575         KASSERT(stcb != NULL, ("stcb is NULL"));
13576         SCTP_TCB_LOCK_ASSERT(stcb);
13577         KASSERT((asoc->state & SCTP_STATE_ABOUT_TO_BE_FREED) == 0,
13578             ("Association about to be freed"));
13579         KASSERT((asoc->state & SCTP_STATE_WAS_ABORTED) == 0,
13580             ("Association was aborted"));
13581
13582         NET_EPOCH_ENTER(et);
13583         if ((queue_only == 0) && (nagle_applies == 0) && (asoc->peers_rwnd && un_sent)) {
13584                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13585         } else if ((queue_only == 0) &&
13586                     (asoc->peers_rwnd == 0) &&
13587             (asoc->total_flight == 0)) {
13588                 /* We get to have a probe outstanding */
13589                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13590         } else if (some_on_control) {
13591                 int num_out, reason;
13592
13593                 /* Here we do control only */
13594                 (void)sctp_med_chunk_output(inp, stcb, asoc, &num_out,
13595                     &reason, 1, 1, &now, &now_filled,
13596                     sctp_get_frag_point(stcb),
13597                     SCTP_SO_LOCKED);
13598         }
13599         NET_EPOCH_EXIT(et);
13600         SCTPDBG(SCTP_DEBUG_OUTPUT1, "USR Send complete qo:%d prw:%d unsent:%d tf:%d cooq:%d toqs:%d err:%d\n",
13601             queue_only, asoc->peers_rwnd, un_sent,
13602             asoc->total_flight, asoc->chunks_on_out_queue,
13603             asoc->total_output_queue_size, error);
13604
13605         KASSERT(stcb != NULL, ("stcb is NULL"));
13606         SCTP_TCB_LOCK_ASSERT(stcb);
13607         KASSERT((asoc->state & SCTP_STATE_ABOUT_TO_BE_FREED) == 0,
13608             ("Association about to be freed"));
13609         KASSERT((asoc->state & SCTP_STATE_WAS_ABORTED) == 0,
13610             ("Association was aborted"));
13611
13612 out:
13613 out_unlocked:
13614         if (create_lock_applied) {
13615                 SCTP_ASOC_CREATE_UNLOCK(inp);
13616         }
13617         if (stcb != NULL) {
13618                 if (local_soresv) {
13619                         atomic_subtract_int(&asoc->sb_send_resv, (int)sndlen);
13620                 }
13621                 if (free_cnt_applied) {
13622                         atomic_subtract_int(&asoc->refcnt, 1);
13623                 }
13624                 SCTP_TCB_UNLOCK(stcb);
13625         }
13626         if (top != NULL) {
13627                 sctp_m_freem(top);
13628         }
13629         if (control != NULL) {
13630                 sctp_m_freem(control);
13631         }
13632         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, error);
13633         return (error);
13634 }
13635
13636 /*
13637  * generate an AUTHentication chunk, if required
13638  */
13639 struct mbuf *
13640 sctp_add_auth_chunk(struct mbuf *m, struct mbuf **m_end,
13641     struct sctp_auth_chunk **auth_ret, uint32_t *offset,
13642     struct sctp_tcb *stcb, uint8_t chunk)
13643 {
13644         struct mbuf *m_auth;
13645         struct sctp_auth_chunk *auth;
13646         int chunk_len;
13647         struct mbuf *cn;
13648
13649         if ((m_end == NULL) || (auth_ret == NULL) || (offset == NULL) ||
13650             (stcb == NULL))
13651                 return (m);
13652
13653         if (stcb->asoc.auth_supported == 0) {
13654                 return (m);
13655         }
13656         /* does the requested chunk require auth? */
13657         if (!sctp_auth_is_required_chunk(chunk, stcb->asoc.peer_auth_chunks)) {
13658                 return (m);
13659         }
13660         m_auth = sctp_get_mbuf_for_msg(sizeof(*auth), 0, M_NOWAIT, 1, MT_HEADER);
13661         if (m_auth == NULL) {
13662                 /* no mbuf's */
13663                 return (m);
13664         }
13665         /* reserve some space if this will be the first mbuf */
13666         if (m == NULL)
13667                 SCTP_BUF_RESV_UF(m_auth, SCTP_MIN_OVERHEAD);
13668         /* fill in the AUTH chunk details */
13669         auth = mtod(m_auth, struct sctp_auth_chunk *);
13670         memset(auth, 0, sizeof(*auth));
13671         auth->ch.chunk_type = SCTP_AUTHENTICATION;
13672         auth->ch.chunk_flags = 0;
13673         chunk_len = sizeof(*auth) +
13674             sctp_get_hmac_digest_len(stcb->asoc.peer_hmac_id);
13675         auth->ch.chunk_length = htons(chunk_len);
13676         auth->hmac_id = htons(stcb->asoc.peer_hmac_id);
13677         /* key id and hmac digest will be computed and filled in upon send */
13678
13679         /* save the offset where the auth was inserted into the chain */
13680         *offset = 0;
13681         for (cn = m; cn; cn = SCTP_BUF_NEXT(cn)) {
13682                 *offset += SCTP_BUF_LEN(cn);
13683         }
13684
13685         /* update length and return pointer to the auth chunk */
13686         SCTP_BUF_LEN(m_auth) = chunk_len;
13687         m = sctp_copy_mbufchain(m_auth, m, m_end, 1, chunk_len, 0);
13688         if (auth_ret != NULL)
13689                 *auth_ret = auth;
13690
13691         return (m);
13692 }
13693
13694 #ifdef INET6
13695 int
13696 sctp_v6src_match_nexthop(struct sockaddr_in6 *src6, sctp_route_t *ro)
13697 {
13698         struct nd_prefix *pfx = NULL;
13699         struct nd_pfxrouter *pfxrtr = NULL;
13700         struct sockaddr_in6 gw6;
13701
13702         if (ro == NULL || ro->ro_nh == NULL || src6->sin6_family != AF_INET6)
13703                 return (0);
13704
13705         /* get prefix entry of address */
13706         ND6_RLOCK();
13707         LIST_FOREACH(pfx, &MODULE_GLOBAL(nd_prefix), ndpr_entry) {
13708                 if (pfx->ndpr_stateflags & NDPRF_DETACHED)
13709                         continue;
13710                 if (IN6_ARE_MASKED_ADDR_EQUAL(&pfx->ndpr_prefix.sin6_addr,
13711                     &src6->sin6_addr, &pfx->ndpr_mask))
13712                         break;
13713         }
13714         /* no prefix entry in the prefix list */
13715         if (pfx == NULL) {
13716                 ND6_RUNLOCK();
13717                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "No prefix entry for ");
13718                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)src6);
13719                 return (0);
13720         }
13721
13722         SCTPDBG(SCTP_DEBUG_OUTPUT2, "v6src_match_nexthop(), Prefix entry is ");
13723         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)src6);
13724
13725         /* search installed gateway from prefix entry */
13726         LIST_FOREACH(pfxrtr, &pfx->ndpr_advrtrs, pfr_entry) {
13727                 memset(&gw6, 0, sizeof(struct sockaddr_in6));
13728                 gw6.sin6_family = AF_INET6;
13729                 gw6.sin6_len = sizeof(struct sockaddr_in6);
13730                 memcpy(&gw6.sin6_addr, &pfxrtr->router->rtaddr,
13731                     sizeof(struct in6_addr));
13732                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "prefix router is ");
13733                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)&gw6);
13734                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "installed router is ");
13735                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, &ro->ro_nh->gw_sa);
13736                 if (sctp_cmpaddr((struct sockaddr *)&gw6, &ro->ro_nh->gw_sa)) {
13737                         ND6_RUNLOCK();
13738                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "pfxrouter is installed\n");
13739                         return (1);
13740                 }
13741         }
13742         ND6_RUNLOCK();
13743         SCTPDBG(SCTP_DEBUG_OUTPUT2, "pfxrouter is not installed\n");
13744         return (0);
13745 }
13746 #endif
13747
13748 int
13749 sctp_v4src_match_nexthop(struct sctp_ifa *sifa, sctp_route_t *ro)
13750 {
13751 #ifdef INET
13752         struct sockaddr_in *sin, *mask;
13753         struct ifaddr *ifa;
13754         struct in_addr srcnetaddr, gwnetaddr;
13755
13756         if (ro == NULL || ro->ro_nh == NULL ||
13757             sifa->address.sa.sa_family != AF_INET) {
13758                 return (0);
13759         }
13760         ifa = (struct ifaddr *)sifa->ifa;
13761         mask = (struct sockaddr_in *)(ifa->ifa_netmask);
13762         sin = &sifa->address.sin;
13763         srcnetaddr.s_addr = (sin->sin_addr.s_addr & mask->sin_addr.s_addr);
13764         SCTPDBG(SCTP_DEBUG_OUTPUT1, "match_nexthop4: src address is ");
13765         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, &sifa->address.sa);
13766         SCTPDBG(SCTP_DEBUG_OUTPUT1, "network address is %x\n", srcnetaddr.s_addr);
13767
13768         sin = &ro->ro_nh->gw4_sa;
13769         gwnetaddr.s_addr = (sin->sin_addr.s_addr & mask->sin_addr.s_addr);
13770         SCTPDBG(SCTP_DEBUG_OUTPUT1, "match_nexthop4: nexthop is ");
13771         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, &ro->ro_nh->gw_sa);
13772         SCTPDBG(SCTP_DEBUG_OUTPUT1, "network address is %x\n", gwnetaddr.s_addr);
13773         if (srcnetaddr.s_addr == gwnetaddr.s_addr) {
13774                 return (1);
13775         }
13776 #endif
13777         return (0);
13778 }