sys/netinet/sctp_output.c

   1 /*-
   2  * SPDX-License-Identifier: BSD-3-Clause
   3  *
   4  * Copyright (c) 2001-2008, by Cisco Systems, Inc. All rights reserved.
   5  * Copyright (c) 2008-2012, by Randall Stewart. All rights reserved.
   6  * Copyright (c) 2008-2012, by Michael Tuexen. All rights reserved.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions are met:
  10  *
  11  * a) Redistributions of source code must retain the above copyright notice,
  12  *    this list of conditions and the following disclaimer.
  13  *
  14  * b) Redistributions in binary form must reproduce the above copyright
  15  *    notice, this list of conditions and the following disclaimer in
  16  *    the documentation and/or other materials provided with the distribution.
  17  *
  18  * c) Neither the name of Cisco Systems, Inc. nor the names of its
  19  *    contributors may be used to endorse or promote products derived
  20  *    from this software without specific prior written permission.
  21  *
  22  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  23  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
  24  * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  25  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
  26  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  27  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  28  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  29  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  30  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  31  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
  32  * THE POSSIBILITY OF SUCH DAMAGE.
  33  */
  34
  35 #include <sys/cdefs.h>
  36 __FBSDID("$FreeBSD$");
  37
  38 #include <netinet/sctp_os.h>
  39 #include <sys/proc.h>
  40 #include <netinet/sctp_var.h>
  41 #include <netinet/sctp_sysctl.h>
  42 #include <netinet/sctp_header.h>
  43 #include <netinet/sctp_pcb.h>
  44 #include <netinet/sctputil.h>
  45 #include <netinet/sctp_output.h>
  46 #include <netinet/sctp_uio.h>
  47 #include <netinet/sctputil.h>
  48 #include <netinet/sctp_auth.h>
  49 #include <netinet/sctp_timer.h>
  50 #include <netinet/sctp_asconf.h>
  51 #include <netinet/sctp_indata.h>
  52 #include <netinet/sctp_bsd_addr.h>
  53 #include <netinet/sctp_input.h>
  54 #include <netinet/sctp_crc32.h>
  55 #include <netinet/sctp_kdtrace.h>
  56 #if defined(INET) || defined(INET6)
  57 #include <netinet/udp.h>
  58 #endif
  59 #include <netinet/udp_var.h>
  60 #include <machine/in_cksum.h>
  61
  62 #define SCTP_MAX_GAPS_INARRAY 4
  63 struct sack_track {
  64         uint8_t right_edge;     /* mergable on the right edge */
  65         uint8_t left_edge;      /* mergable on the left edge */
  66         uint8_t num_entries;
  67         uint8_t spare;
  68         struct sctp_gap_ack_block gaps[SCTP_MAX_GAPS_INARRAY];
  69 };
  70
  71 const struct sack_track sack_array[256] = {
  72         {0, 0, 0, 0,            /* 0x00 */
  73                 {{0, 0},
  74                 {0, 0},
  75                 {0, 0},
  76                 {0, 0}
  77                 }
  78         },
  79         {1, 0, 1, 0,            /* 0x01 */
  80                 {{0, 0},
  81                 {0, 0},
  82                 {0, 0},
  83                 {0, 0}
  84                 }
  85         },
  86         {0, 0, 1, 0,            /* 0x02 */
  87                 {{1, 1},
  88                 {0, 0},
  89                 {0, 0},
  90                 {0, 0}
  91                 }
  92         },
  93         {1, 0, 1, 0,            /* 0x03 */
  94                 {{0, 1},
  95                 {0, 0},
  96                 {0, 0},
  97                 {0, 0}
  98                 }
  99         },
 100         {0, 0, 1, 0,            /* 0x04 */
 101                 {{2, 2},
 102                 {0, 0},
 103                 {0, 0},
 104                 {0, 0}
 105                 }
 106         },
 107         {1, 0, 2, 0,            /* 0x05 */
 108                 {{0, 0},
 109                 {2, 2},
 110                 {0, 0},
 111                 {0, 0}
 112                 }
 113         },
 114         {0, 0, 1, 0,            /* 0x06 */
 115                 {{1, 2},
 116                 {0, 0},
 117                 {0, 0},
 118                 {0, 0}
 119                 }
 120         },
 121         {1, 0, 1, 0,            /* 0x07 */
 122                 {{0, 2},
 123                 {0, 0},
 124                 {0, 0},
 125                 {0, 0}
 126                 }
 127         },
 128         {0, 0, 1, 0,            /* 0x08 */
 129                 {{3, 3},
 130                 {0, 0},
 131                 {0, 0},
 132                 {0, 0}
 133                 }
 134         },
 135         {1, 0, 2, 0,            /* 0x09 */
 136                 {{0, 0},
 137                 {3, 3},
 138                 {0, 0},
 139                 {0, 0}
 140                 }
 141         },
 142         {0, 0, 2, 0,            /* 0x0a */
 143                 {{1, 1},
 144                 {3, 3},
 145                 {0, 0},
 146                 {0, 0}
 147                 }
 148         },
 149         {1, 0, 2, 0,            /* 0x0b */
 150                 {{0, 1},
 151                 {3, 3},
 152                 {0, 0},
 153                 {0, 0}
 154                 }
 155         },
 156         {0, 0, 1, 0,            /* 0x0c */
 157                 {{2, 3},
 158                 {0, 0},
 159                 {0, 0},
 160                 {0, 0}
 161                 }
 162         },
 163         {1, 0, 2, 0,            /* 0x0d */
 164                 {{0, 0},
 165                 {2, 3},
 166                 {0, 0},
 167                 {0, 0}
 168                 }
 169         },
 170         {0, 0, 1, 0,            /* 0x0e */
 171                 {{1, 3},
 172                 {0, 0},
 173                 {0, 0},
 174                 {0, 0}
 175                 }
 176         },
 177         {1, 0, 1, 0,            /* 0x0f */
 178                 {{0, 3},
 179                 {0, 0},
 180                 {0, 0},
 181                 {0, 0}
 182                 }
 183         },
 184         {0, 0, 1, 0,            /* 0x10 */
 185                 {{4, 4},
 186                 {0, 0},
 187                 {0, 0},
 188                 {0, 0}
 189                 }
 190         },
 191         {1, 0, 2, 0,            /* 0x11 */
 192                 {{0, 0},
 193                 {4, 4},
 194                 {0, 0},
 195                 {0, 0}
 196                 }
 197         },
 198         {0, 0, 2, 0,            /* 0x12 */
 199                 {{1, 1},
 200                 {4, 4},
 201                 {0, 0},
 202                 {0, 0}
 203                 }
 204         },
 205         {1, 0, 2, 0,            /* 0x13 */
 206                 {{0, 1},
 207                 {4, 4},
 208                 {0, 0},
 209                 {0, 0}
 210                 }
 211         },
 212         {0, 0, 2, 0,            /* 0x14 */
 213                 {{2, 2},
 214                 {4, 4},
 215                 {0, 0},
 216                 {0, 0}
 217                 }
 218         },
 219         {1, 0, 3, 0,            /* 0x15 */
 220                 {{0, 0},
 221                 {2, 2},
 222                 {4, 4},
 223                 {0, 0}
 224                 }
 225         },
 226         {0, 0, 2, 0,            /* 0x16 */
 227                 {{1, 2},
 228                 {4, 4},
 229                 {0, 0},
 230                 {0, 0}
 231                 }
 232         },
 233         {1, 0, 2, 0,            /* 0x17 */
 234                 {{0, 2},
 235                 {4, 4},
 236                 {0, 0},
 237                 {0, 0}
 238                 }
 239         },
 240         {0, 0, 1, 0,            /* 0x18 */
 241                 {{3, 4},
 242                 {0, 0},
 243                 {0, 0},
 244                 {0, 0}
 245                 }
 246         },
 247         {1, 0, 2, 0,            /* 0x19 */
 248                 {{0, 0},
 249                 {3, 4},
 250                 {0, 0},
 251                 {0, 0}
 252                 }
 253         },
 254         {0, 0, 2, 0,            /* 0x1a */
 255                 {{1, 1},
 256                 {3, 4},
 257                 {0, 0},
 258                 {0, 0}
 259                 }
 260         },
 261         {1, 0, 2, 0,            /* 0x1b */
 262                 {{0, 1},
 263                 {3, 4},
 264                 {0, 0},
 265                 {0, 0}
 266                 }
 267         },
 268         {0, 0, 1, 0,            /* 0x1c */
 269                 {{2, 4},
 270                 {0, 0},
 271                 {0, 0},
 272                 {0, 0}
 273                 }
 274         },
 275         {1, 0, 2, 0,            /* 0x1d */
 276                 {{0, 0},
 277                 {2, 4},
 278                 {0, 0},
 279                 {0, 0}
 280                 }
 281         },
 282         {0, 0, 1, 0,            /* 0x1e */
 283                 {{1, 4},
 284                 {0, 0},
 285                 {0, 0},
 286                 {0, 0}
 287                 }
 288         },
 289         {1, 0, 1, 0,            /* 0x1f */
 290                 {{0, 4},
 291                 {0, 0},
 292                 {0, 0},
 293                 {0, 0}
 294                 }
 295         },
 296         {0, 0, 1, 0,            /* 0x20 */
 297                 {{5, 5},
 298                 {0, 0},
 299                 {0, 0},
 300                 {0, 0}
 301                 }
 302         },
 303         {1, 0, 2, 0,            /* 0x21 */
 304                 {{0, 0},
 305                 {5, 5},
 306                 {0, 0},
 307                 {0, 0}
 308                 }
 309         },
 310         {0, 0, 2, 0,            /* 0x22 */
 311                 {{1, 1},
 312                 {5, 5},
 313                 {0, 0},
 314                 {0, 0}
 315                 }
 316         },
 317         {1, 0, 2, 0,            /* 0x23 */
 318                 {{0, 1},
 319                 {5, 5},
 320                 {0, 0},
 321                 {0, 0}
 322                 }
 323         },
 324         {0, 0, 2, 0,            /* 0x24 */
 325                 {{2, 2},
 326                 {5, 5},
 327                 {0, 0},
 328                 {0, 0}
 329                 }
 330         },
 331         {1, 0, 3, 0,            /* 0x25 */
 332                 {{0, 0},
 333                 {2, 2},
 334                 {5, 5},
 335                 {0, 0}
 336                 }
 337         },
 338         {0, 0, 2, 0,            /* 0x26 */
 339                 {{1, 2},
 340                 {5, 5},
 341                 {0, 0},
 342                 {0, 0}
 343                 }
 344         },
 345         {1, 0, 2, 0,            /* 0x27 */
 346                 {{0, 2},
 347                 {5, 5},
 348                 {0, 0},
 349                 {0, 0}
 350                 }
 351         },
 352         {0, 0, 2, 0,            /* 0x28 */
 353                 {{3, 3},
 354                 {5, 5},
 355                 {0, 0},
 356                 {0, 0}
 357                 }
 358         },
 359         {1, 0, 3, 0,            /* 0x29 */
 360                 {{0, 0},
 361                 {3, 3},
 362                 {5, 5},
 363                 {0, 0}
 364                 }
 365         },
 366         {0, 0, 3, 0,            /* 0x2a */
 367                 {{1, 1},
 368                 {3, 3},
 369                 {5, 5},
 370                 {0, 0}
 371                 }
 372         },
 373         {1, 0, 3, 0,            /* 0x2b */
 374                 {{0, 1},
 375                 {3, 3},
 376                 {5, 5},
 377                 {0, 0}
 378                 }
 379         },
 380         {0, 0, 2, 0,            /* 0x2c */
 381                 {{2, 3},
 382                 {5, 5},
 383                 {0, 0},
 384                 {0, 0}
 385                 }
 386         },
 387         {1, 0, 3, 0,            /* 0x2d */
 388                 {{0, 0},
 389                 {2, 3},
 390                 {5, 5},
 391                 {0, 0}
 392                 }
 393         },
 394         {0, 0, 2, 0,            /* 0x2e */
 395                 {{1, 3},
 396                 {5, 5},
 397                 {0, 0},
 398                 {0, 0}
 399                 }
 400         },
 401         {1, 0, 2, 0,            /* 0x2f */
 402                 {{0, 3},
 403                 {5, 5},
 404                 {0, 0},
 405                 {0, 0}
 406                 }
 407         },
 408         {0, 0, 1, 0,            /* 0x30 */
 409                 {{4, 5},
 410                 {0, 0},
 411                 {0, 0},
 412                 {0, 0}
 413                 }
 414         },
 415         {1, 0, 2, 0,            /* 0x31 */
 416                 {{0, 0},
 417                 {4, 5},
 418                 {0, 0},
 419                 {0, 0}
 420                 }
 421         },
 422         {0, 0, 2, 0,            /* 0x32 */
 423                 {{1, 1},
 424                 {4, 5},
 425                 {0, 0},
 426                 {0, 0}
 427                 }
 428         },
 429         {1, 0, 2, 0,            /* 0x33 */
 430                 {{0, 1},
 431                 {4, 5},
 432                 {0, 0},
 433                 {0, 0}
 434                 }
 435         },
 436         {0, 0, 2, 0,            /* 0x34 */
 437                 {{2, 2},
 438                 {4, 5},
 439                 {0, 0},
 440                 {0, 0}
 441                 }
 442         },
 443         {1, 0, 3, 0,            /* 0x35 */
 444                 {{0, 0},
 445                 {2, 2},
 446                 {4, 5},
 447                 {0, 0}
 448                 }
 449         },
 450         {0, 0, 2, 0,            /* 0x36 */
 451                 {{1, 2},
 452                 {4, 5},
 453                 {0, 0},
 454                 {0, 0}
 455                 }
 456         },
 457         {1, 0, 2, 0,            /* 0x37 */
 458                 {{0, 2},
 459                 {4, 5},
 460                 {0, 0},
 461                 {0, 0}
 462                 }
 463         },
 464         {0, 0, 1, 0,            /* 0x38 */
 465                 {{3, 5},
 466                 {0, 0},
 467                 {0, 0},
 468                 {0, 0}
 469                 }
 470         },
 471         {1, 0, 2, 0,            /* 0x39 */
 472                 {{0, 0},
 473                 {3, 5},
 474                 {0, 0},
 475                 {0, 0}
 476                 }
 477         },
 478         {0, 0, 2, 0,            /* 0x3a */
 479                 {{1, 1},
 480                 {3, 5},
 481                 {0, 0},
 482                 {0, 0}
 483                 }
 484         },
 485         {1, 0, 2, 0,            /* 0x3b */
 486                 {{0, 1},
 487                 {3, 5},
 488                 {0, 0},
 489                 {0, 0}
 490                 }
 491         },
 492         {0, 0, 1, 0,            /* 0x3c */
 493                 {{2, 5},
 494                 {0, 0},
 495                 {0, 0},
 496                 {0, 0}
 497                 }
 498         },
 499         {1, 0, 2, 0,            /* 0x3d */
 500                 {{0, 0},
 501                 {2, 5},
 502                 {0, 0},
 503                 {0, 0}
 504                 }
 505         },
 506         {0, 0, 1, 0,            /* 0x3e */
 507                 {{1, 5},
 508                 {0, 0},
 509                 {0, 0},
 510                 {0, 0}
 511                 }
 512         },
 513         {1, 0, 1, 0,            /* 0x3f */
 514                 {{0, 5},
 515                 {0, 0},
 516                 {0, 0},
 517                 {0, 0}
 518                 }
 519         },
 520         {0, 0, 1, 0,            /* 0x40 */
 521                 {{6, 6},
 522                 {0, 0},
 523                 {0, 0},
 524                 {0, 0}
 525                 }
 526         },
 527         {1, 0, 2, 0,            /* 0x41 */
 528                 {{0, 0},
 529                 {6, 6},
 530                 {0, 0},
 531                 {0, 0}
 532                 }
 533         },
 534         {0, 0, 2, 0,            /* 0x42 */
 535                 {{1, 1},
 536                 {6, 6},
 537                 {0, 0},
 538                 {0, 0}
 539                 }
 540         },
 541         {1, 0, 2, 0,            /* 0x43 */
 542                 {{0, 1},
 543                 {6, 6},
 544                 {0, 0},
 545                 {0, 0}
 546                 }
 547         },
 548         {0, 0, 2, 0,            /* 0x44 */
 549                 {{2, 2},
 550                 {6, 6},
 551                 {0, 0},
 552                 {0, 0}
 553                 }
 554         },
 555         {1, 0, 3, 0,            /* 0x45 */
 556                 {{0, 0},
 557                 {2, 2},
 558                 {6, 6},
 559                 {0, 0}
 560                 }
 561         },
 562         {0, 0, 2, 0,            /* 0x46 */
 563                 {{1, 2},
 564                 {6, 6},
 565                 {0, 0},
 566                 {0, 0}
 567                 }
 568         },
 569         {1, 0, 2, 0,            /* 0x47 */
 570                 {{0, 2},
 571                 {6, 6},
 572                 {0, 0},
 573                 {0, 0}
 574                 }
 575         },
 576         {0, 0, 2, 0,            /* 0x48 */
 577                 {{3, 3},
 578                 {6, 6},
 579                 {0, 0},
 580                 {0, 0}
 581                 }
 582         },
 583         {1, 0, 3, 0,            /* 0x49 */
 584                 {{0, 0},
 585                 {3, 3},
 586                 {6, 6},
 587                 {0, 0}
 588                 }
 589         },
 590         {0, 0, 3, 0,            /* 0x4a */
 591                 {{1, 1},
 592                 {3, 3},
 593                 {6, 6},
 594                 {0, 0}
 595                 }
 596         },
 597         {1, 0, 3, 0,            /* 0x4b */
 598                 {{0, 1},
 599                 {3, 3},
 600                 {6, 6},
 601                 {0, 0}
 602                 }
 603         },
 604         {0, 0, 2, 0,            /* 0x4c */
 605                 {{2, 3},
 606                 {6, 6},
 607                 {0, 0},
 608                 {0, 0}
 609                 }
 610         },
 611         {1, 0, 3, 0,            /* 0x4d */
 612                 {{0, 0},
 613                 {2, 3},
 614                 {6, 6},
 615                 {0, 0}
 616                 }
 617         },
 618         {0, 0, 2, 0,            /* 0x4e */
 619                 {{1, 3},
 620                 {6, 6},
 621                 {0, 0},
 622                 {0, 0}
 623                 }
 624         },
 625         {1, 0, 2, 0,            /* 0x4f */
 626                 {{0, 3},
 627                 {6, 6},
 628                 {0, 0},
 629                 {0, 0}
 630                 }
 631         },
 632         {0, 0, 2, 0,            /* 0x50 */
 633                 {{4, 4},
 634                 {6, 6},
 635                 {0, 0},
 636                 {0, 0}
 637                 }
 638         },
 639         {1, 0, 3, 0,            /* 0x51 */
 640                 {{0, 0},
 641                 {4, 4},
 642                 {6, 6},
 643                 {0, 0}
 644                 }
 645         },
 646         {0, 0, 3, 0,            /* 0x52 */
 647                 {{1, 1},
 648                 {4, 4},
 649                 {6, 6},
 650                 {0, 0}
 651                 }
 652         },
 653         {1, 0, 3, 0,            /* 0x53 */
 654                 {{0, 1},
 655                 {4, 4},
 656                 {6, 6},
 657                 {0, 0}
 658                 }
 659         },
 660         {0, 0, 3, 0,            /* 0x54 */
 661                 {{2, 2},
 662                 {4, 4},
 663                 {6, 6},
 664                 {0, 0}
 665                 }
 666         },
 667         {1, 0, 4, 0,            /* 0x55 */
 668                 {{0, 0},
 669                 {2, 2},
 670                 {4, 4},
 671                 {6, 6}
 672                 }
 673         },
 674         {0, 0, 3, 0,            /* 0x56 */
 675                 {{1, 2},
 676                 {4, 4},
 677                 {6, 6},
 678                 {0, 0}
 679                 }
 680         },
 681         {1, 0, 3, 0,            /* 0x57 */
 682                 {{0, 2},
 683                 {4, 4},
 684                 {6, 6},
 685                 {0, 0}
 686                 }
 687         },
 688         {0, 0, 2, 0,            /* 0x58 */
 689                 {{3, 4},
 690                 {6, 6},
 691                 {0, 0},
 692                 {0, 0}
 693                 }
 694         },
 695         {1, 0, 3, 0,            /* 0x59 */
 696                 {{0, 0},
 697                 {3, 4},
 698                 {6, 6},
 699                 {0, 0}
 700                 }
 701         },
 702         {0, 0, 3, 0,            /* 0x5a */
 703                 {{1, 1},
 704                 {3, 4},
 705                 {6, 6},
 706                 {0, 0}
 707                 }
 708         },
 709         {1, 0, 3, 0,            /* 0x5b */
 710                 {{0, 1},
 711                 {3, 4},
 712                 {6, 6},
 713                 {0, 0}
 714                 }
 715         },
 716         {0, 0, 2, 0,            /* 0x5c */
 717                 {{2, 4},
 718                 {6, 6},
 719                 {0, 0},
 720                 {0, 0}
 721                 }
 722         },
 723         {1, 0, 3, 0,            /* 0x5d */
 724                 {{0, 0},
 725                 {2, 4},
 726                 {6, 6},
 727                 {0, 0}
 728                 }
 729         },
 730         {0, 0, 2, 0,            /* 0x5e */
 731                 {{1, 4},
 732                 {6, 6},
 733                 {0, 0},
 734                 {0, 0}
 735                 }
 736         },
 737         {1, 0, 2, 0,            /* 0x5f */
 738                 {{0, 4},
 739                 {6, 6},
 740                 {0, 0},
 741                 {0, 0}
 742                 }
 743         },
 744         {0, 0, 1, 0,            /* 0x60 */
 745                 {{5, 6},
 746                 {0, 0},
 747                 {0, 0},
 748                 {0, 0}
 749                 }
 750         },
 751         {1, 0, 2, 0,            /* 0x61 */
 752                 {{0, 0},
 753                 {5, 6},
 754                 {0, 0},
 755                 {0, 0}
 756                 }
 757         },
 758         {0, 0, 2, 0,            /* 0x62 */
 759                 {{1, 1},
 760                 {5, 6},
 761                 {0, 0},
 762                 {0, 0}
 763                 }
 764         },
 765         {1, 0, 2, 0,            /* 0x63 */
 766                 {{0, 1},
 767                 {5, 6},
 768                 {0, 0},
 769                 {0, 0}
 770                 }
 771         },
 772         {0, 0, 2, 0,            /* 0x64 */
 773                 {{2, 2},
 774                 {5, 6},
 775                 {0, 0},
 776                 {0, 0}
 777                 }
 778         },
 779         {1, 0, 3, 0,            /* 0x65 */
 780                 {{0, 0},
 781                 {2, 2},
 782                 {5, 6},
 783                 {0, 0}
 784                 }
 785         },
 786         {0, 0, 2, 0,            /* 0x66 */
 787                 {{1, 2},
 788                 {5, 6},
 789                 {0, 0},
 790                 {0, 0}
 791                 }
 792         },
 793         {1, 0, 2, 0,            /* 0x67 */
 794                 {{0, 2},
 795                 {5, 6},
 796                 {0, 0},
 797                 {0, 0}
 798                 }
 799         },
 800         {0, 0, 2, 0,            /* 0x68 */
 801                 {{3, 3},
 802                 {5, 6},
 803                 {0, 0},
 804                 {0, 0}
 805                 }
 806         },
 807         {1, 0, 3, 0,            /* 0x69 */
 808                 {{0, 0},
 809                 {3, 3},
 810                 {5, 6},
 811                 {0, 0}
 812                 }
 813         },
 814         {0, 0, 3, 0,            /* 0x6a */
 815                 {{1, 1},
 816                 {3, 3},
 817                 {5, 6},
 818                 {0, 0}
 819                 }
 820         },
 821         {1, 0, 3, 0,            /* 0x6b */
 822                 {{0, 1},
 823                 {3, 3},
 824                 {5, 6},
 825                 {0, 0}
 826                 }
 827         },
 828         {0, 0, 2, 0,            /* 0x6c */
 829                 {{2, 3},
 830                 {5, 6},
 831                 {0, 0},
 832                 {0, 0}
 833                 }
 834         },
 835         {1, 0, 3, 0,            /* 0x6d */
 836                 {{0, 0},
 837                 {2, 3},
 838                 {5, 6},
 839                 {0, 0}
 840                 }
 841         },
 842         {0, 0, 2, 0,            /* 0x6e */
 843                 {{1, 3},
 844                 {5, 6},
 845                 {0, 0},
 846                 {0, 0}
 847                 }
 848         },
 849         {1, 0, 2, 0,            /* 0x6f */
 850                 {{0, 3},
 851                 {5, 6},
 852                 {0, 0},
 853                 {0, 0}
 854                 }
 855         },
 856         {0, 0, 1, 0,            /* 0x70 */
 857                 {{4, 6},
 858                 {0, 0},
 859                 {0, 0},
 860                 {0, 0}
 861                 }
 862         },
 863         {1, 0, 2, 0,            /* 0x71 */
 864                 {{0, 0},
 865                 {4, 6},
 866                 {0, 0},
 867                 {0, 0}
 868                 }
 869         },
 870         {0, 0, 2, 0,            /* 0x72 */
 871                 {{1, 1},
 872                 {4, 6},
 873                 {0, 0},
 874                 {0, 0}
 875                 }
 876         },
 877         {1, 0, 2, 0,            /* 0x73 */
 878                 {{0, 1},
 879                 {4, 6},
 880                 {0, 0},
 881                 {0, 0}
 882                 }
 883         },
 884         {0, 0, 2, 0,            /* 0x74 */
 885                 {{2, 2},
 886                 {4, 6},
 887                 {0, 0},
 888                 {0, 0}
 889                 }
 890         },
 891         {1, 0, 3, 0,            /* 0x75 */
 892                 {{0, 0},
 893                 {2, 2},
 894                 {4, 6},
 895                 {0, 0}
 896                 }
 897         },
 898         {0, 0, 2, 0,            /* 0x76 */
 899                 {{1, 2},
 900                 {4, 6},
 901                 {0, 0},
 902                 {0, 0}
 903                 }
 904         },
 905         {1, 0, 2, 0,            /* 0x77 */
 906                 {{0, 2},
 907                 {4, 6},
 908                 {0, 0},
 909                 {0, 0}
 910                 }
 911         },
 912         {0, 0, 1, 0,            /* 0x78 */
 913                 {{3, 6},
 914                 {0, 0},
 915                 {0, 0},
 916                 {0, 0}
 917                 }
 918         },
 919         {1, 0, 2, 0,            /* 0x79 */
 920                 {{0, 0},
 921                 {3, 6},
 922                 {0, 0},
 923                 {0, 0}
 924                 }
 925         },
 926         {0, 0, 2, 0,            /* 0x7a */
 927                 {{1, 1},
 928                 {3, 6},
 929                 {0, 0},
 930                 {0, 0}
 931                 }
 932         },
 933         {1, 0, 2, 0,            /* 0x7b */
 934                 {{0, 1},
 935                 {3, 6},
 936                 {0, 0},
 937                 {0, 0}
 938                 }
 939         },
 940         {0, 0, 1, 0,            /* 0x7c */
 941                 {{2, 6},
 942                 {0, 0},
 943                 {0, 0},
 944                 {0, 0}
 945                 }
 946         },
 947         {1, 0, 2, 0,            /* 0x7d */
 948                 {{0, 0},
 949                 {2, 6},
 950                 {0, 0},
 951                 {0, 0}
 952                 }
 953         },
 954         {0, 0, 1, 0,            /* 0x7e */
 955                 {{1, 6},
 956                 {0, 0},
 957                 {0, 0},
 958                 {0, 0}
 959                 }
 960         },
 961         {1, 0, 1, 0,            /* 0x7f */
 962                 {{0, 6},
 963                 {0, 0},
 964                 {0, 0},
 965                 {0, 0}
 966                 }
 967         },
 968         {0, 1, 1, 0,            /* 0x80 */
 969                 {{7, 7},
 970                 {0, 0},
 971                 {0, 0},
 972                 {0, 0}
 973                 }
 974         },
 975         {1, 1, 2, 0,            /* 0x81 */
 976                 {{0, 0},
 977                 {7, 7},
 978                 {0, 0},
 979                 {0, 0}
 980                 }
 981         },
 982         {0, 1, 2, 0,            /* 0x82 */
 983                 {{1, 1},
 984                 {7, 7},
 985                 {0, 0},
 986                 {0, 0}
 987                 }
 988         },
 989         {1, 1, 2, 0,            /* 0x83 */
 990                 {{0, 1},
 991                 {7, 7},
 992                 {0, 0},
 993                 {0, 0}
 994                 }
 995         },
 996         {0, 1, 2, 0,            /* 0x84 */
 997                 {{2, 2},
 998                 {7, 7},
 999                 {0, 0},
1000                 {0, 0}
1001                 }
1002         },
1003         {1, 1, 3, 0,            /* 0x85 */
1004                 {{0, 0},
1005                 {2, 2},
1006                 {7, 7},
1007                 {0, 0}
1008                 }
1009         },
1010         {0, 1, 2, 0,            /* 0x86 */
1011                 {{1, 2},
1012                 {7, 7},
1013                 {0, 0},
1014                 {0, 0}
1015                 }
1016         },
1017         {1, 1, 2, 0,            /* 0x87 */
1018                 {{0, 2},
1019                 {7, 7},
1020                 {0, 0},
1021                 {0, 0}
1022                 }
1023         },
1024         {0, 1, 2, 0,            /* 0x88 */
1025                 {{3, 3},
1026                 {7, 7},
1027                 {0, 0},
1028                 {0, 0}
1029                 }
1030         },
1031         {1, 1, 3, 0,            /* 0x89 */
1032                 {{0, 0},
1033                 {3, 3},
1034                 {7, 7},
1035                 {0, 0}
1036                 }
1037         },
1038         {0, 1, 3, 0,            /* 0x8a */
1039                 {{1, 1},
1040                 {3, 3},
1041                 {7, 7},
1042                 {0, 0}
1043                 }
1044         },
1045         {1, 1, 3, 0,            /* 0x8b */
1046                 {{0, 1},
1047                 {3, 3},
1048                 {7, 7},
1049                 {0, 0}
1050                 }
1051         },
1052         {0, 1, 2, 0,            /* 0x8c */
1053                 {{2, 3},
1054                 {7, 7},
1055                 {0, 0},
1056                 {0, 0}
1057                 }
1058         },
1059         {1, 1, 3, 0,            /* 0x8d */
1060                 {{0, 0},
1061                 {2, 3},
1062                 {7, 7},
1063                 {0, 0}
1064                 }
1065         },
1066         {0, 1, 2, 0,            /* 0x8e */
1067                 {{1, 3},
1068                 {7, 7},
1069                 {0, 0},
1070                 {0, 0}
1071                 }
1072         },
1073         {1, 1, 2, 0,            /* 0x8f */
1074                 {{0, 3},
1075                 {7, 7},
1076                 {0, 0},
1077                 {0, 0}
1078                 }
1079         },
1080         {0, 1, 2, 0,            /* 0x90 */
1081                 {{4, 4},
1082                 {7, 7},
1083                 {0, 0},
1084                 {0, 0}
1085                 }
1086         },
1087         {1, 1, 3, 0,            /* 0x91 */
1088                 {{0, 0},
1089                 {4, 4},
1090                 {7, 7},
1091                 {0, 0}
1092                 }
1093         },
1094         {0, 1, 3, 0,            /* 0x92 */
1095                 {{1, 1},
1096                 {4, 4},
1097                 {7, 7},
1098                 {0, 0}
1099                 }
1100         },
1101         {1, 1, 3, 0,            /* 0x93 */
1102                 {{0, 1},
1103                 {4, 4},
1104                 {7, 7},
1105                 {0, 0}
1106                 }
1107         },
1108         {0, 1, 3, 0,            /* 0x94 */
1109                 {{2, 2},
1110                 {4, 4},
1111                 {7, 7},
1112                 {0, 0}
1113                 }
1114         },
1115         {1, 1, 4, 0,            /* 0x95 */
1116                 {{0, 0},
1117                 {2, 2},
1118                 {4, 4},
1119                 {7, 7}
1120                 }
1121         },
1122         {0, 1, 3, 0,            /* 0x96 */
1123                 {{1, 2},
1124                 {4, 4},
1125                 {7, 7},
1126                 {0, 0}
1127                 }
1128         },
1129         {1, 1, 3, 0,            /* 0x97 */
1130                 {{0, 2},
1131                 {4, 4},
1132                 {7, 7},
1133                 {0, 0}
1134                 }
1135         },
1136         {0, 1, 2, 0,            /* 0x98 */
1137                 {{3, 4},
1138                 {7, 7},
1139                 {0, 0},
1140                 {0, 0}
1141                 }
1142         },
1143         {1, 1, 3, 0,            /* 0x99 */
1144                 {{0, 0},
1145                 {3, 4},
1146                 {7, 7},
1147                 {0, 0}
1148                 }
1149         },
1150         {0, 1, 3, 0,            /* 0x9a */
1151                 {{1, 1},
1152                 {3, 4},
1153                 {7, 7},
1154                 {0, 0}
1155                 }
1156         },
1157         {1, 1, 3, 0,            /* 0x9b */
1158                 {{0, 1},
1159                 {3, 4},
1160                 {7, 7},
1161                 {0, 0}
1162                 }
1163         },
1164         {0, 1, 2, 0,            /* 0x9c */
1165                 {{2, 4},
1166                 {7, 7},
1167                 {0, 0},
1168                 {0, 0}
1169                 }
1170         },
1171         {1, 1, 3, 0,            /* 0x9d */
1172                 {{0, 0},
1173                 {2, 4},
1174                 {7, 7},
1175                 {0, 0}
1176                 }
1177         },
1178         {0, 1, 2, 0,            /* 0x9e */
1179                 {{1, 4},
1180                 {7, 7},
1181                 {0, 0},
1182                 {0, 0}
1183                 }
1184         },
1185         {1, 1, 2, 0,            /* 0x9f */
1186                 {{0, 4},
1187                 {7, 7},
1188                 {0, 0},
1189                 {0, 0}
1190                 }
1191         },
1192         {0, 1, 2, 0,            /* 0xa0 */
1193                 {{5, 5},
1194                 {7, 7},
1195                 {0, 0},
1196                 {0, 0}
1197                 }
1198         },
1199         {1, 1, 3, 0,            /* 0xa1 */
1200                 {{0, 0},
1201                 {5, 5},
1202                 {7, 7},
1203                 {0, 0}
1204                 }
1205         },
1206         {0, 1, 3, 0,            /* 0xa2 */
1207                 {{1, 1},
1208                 {5, 5},
1209                 {7, 7},
1210                 {0, 0}
1211                 }
1212         },
1213         {1, 1, 3, 0,            /* 0xa3 */
1214                 {{0, 1},
1215                 {5, 5},
1216                 {7, 7},
1217                 {0, 0}
1218                 }
1219         },
1220         {0, 1, 3, 0,            /* 0xa4 */
1221                 {{2, 2},
1222                 {5, 5},
1223                 {7, 7},
1224                 {0, 0}
1225                 }
1226         },
1227         {1, 1, 4, 0,            /* 0xa5 */
1228                 {{0, 0},
1229                 {2, 2},
1230                 {5, 5},
1231                 {7, 7}
1232                 }
1233         },
1234         {0, 1, 3, 0,            /* 0xa6 */
1235                 {{1, 2},
1236                 {5, 5},
1237                 {7, 7},
1238                 {0, 0}
1239                 }
1240         },
1241         {1, 1, 3, 0,            /* 0xa7 */
1242                 {{0, 2},
1243                 {5, 5},
1244                 {7, 7},
1245                 {0, 0}
1246                 }
1247         },
1248         {0, 1, 3, 0,            /* 0xa8 */
1249                 {{3, 3},
1250                 {5, 5},
1251                 {7, 7},
1252                 {0, 0}
1253                 }
1254         },
1255         {1, 1, 4, 0,            /* 0xa9 */
1256                 {{0, 0},
1257                 {3, 3},
1258                 {5, 5},
1259                 {7, 7}
1260                 }
1261         },
1262         {0, 1, 4, 0,            /* 0xaa */
1263                 {{1, 1},
1264                 {3, 3},
1265                 {5, 5},
1266                 {7, 7}
1267                 }
1268         },
1269         {1, 1, 4, 0,            /* 0xab */
1270                 {{0, 1},
1271                 {3, 3},
1272                 {5, 5},
1273                 {7, 7}
1274                 }
1275         },
1276         {0, 1, 3, 0,            /* 0xac */
1277                 {{2, 3},
1278                 {5, 5},
1279                 {7, 7},
1280                 {0, 0}
1281                 }
1282         },
1283         {1, 1, 4, 0,            /* 0xad */
1284                 {{0, 0},
1285                 {2, 3},
1286                 {5, 5},
1287                 {7, 7}
1288                 }
1289         },
1290         {0, 1, 3, 0,            /* 0xae */
1291                 {{1, 3},
1292                 {5, 5},
1293                 {7, 7},
1294                 {0, 0}
1295                 }
1296         },
1297         {1, 1, 3, 0,            /* 0xaf */
1298                 {{0, 3},
1299                 {5, 5},
1300                 {7, 7},
1301                 {0, 0}
1302                 }
1303         },
1304         {0, 1, 2, 0,            /* 0xb0 */
1305                 {{4, 5},
1306                 {7, 7},
1307                 {0, 0},
1308                 {0, 0}
1309                 }
1310         },
1311         {1, 1, 3, 0,            /* 0xb1 */
1312                 {{0, 0},
1313                 {4, 5},
1314                 {7, 7},
1315                 {0, 0}
1316                 }
1317         },
1318         {0, 1, 3, 0,            /* 0xb2 */
1319                 {{1, 1},
1320                 {4, 5},
1321                 {7, 7},
1322                 {0, 0}
1323                 }
1324         },
1325         {1, 1, 3, 0,            /* 0xb3 */
1326                 {{0, 1},
1327                 {4, 5},
1328                 {7, 7},
1329                 {0, 0}
1330                 }
1331         },
1332         {0, 1, 3, 0,            /* 0xb4 */
1333                 {{2, 2},
1334                 {4, 5},
1335                 {7, 7},
1336                 {0, 0}
1337                 }
1338         },
1339         {1, 1, 4, 0,            /* 0xb5 */
1340                 {{0, 0},
1341                 {2, 2},
1342                 {4, 5},
1343                 {7, 7}
1344                 }
1345         },
1346         {0, 1, 3, 0,            /* 0xb6 */
1347                 {{1, 2},
1348                 {4, 5},
1349                 {7, 7},
1350                 {0, 0}
1351                 }
1352         },
1353         {1, 1, 3, 0,            /* 0xb7 */
1354                 {{0, 2},
1355                 {4, 5},
1356                 {7, 7},
1357                 {0, 0}
1358                 }
1359         },
1360         {0, 1, 2, 0,            /* 0xb8 */
1361                 {{3, 5},
1362                 {7, 7},
1363                 {0, 0},
1364                 {0, 0}
1365                 }
1366         },
1367         {1, 1, 3, 0,            /* 0xb9 */
1368                 {{0, 0},
1369                 {3, 5},
1370                 {7, 7},
1371                 {0, 0}
1372                 }
1373         },
1374         {0, 1, 3, 0,            /* 0xba */
1375                 {{1, 1},
1376                 {3, 5},
1377                 {7, 7},
1378                 {0, 0}
1379                 }
1380         },
1381         {1, 1, 3, 0,            /* 0xbb */
1382                 {{0, 1},
1383                 {3, 5},
1384                 {7, 7},
1385                 {0, 0}
1386                 }
1387         },
1388         {0, 1, 2, 0,            /* 0xbc */
1389                 {{2, 5},
1390                 {7, 7},
1391                 {0, 0},
1392                 {0, 0}
1393                 }
1394         },
1395         {1, 1, 3, 0,            /* 0xbd */
1396                 {{0, 0},
1397                 {2, 5},
1398                 {7, 7},
1399                 {0, 0}
1400                 }
1401         },
1402         {0, 1, 2, 0,            /* 0xbe */
1403                 {{1, 5},
1404                 {7, 7},
1405                 {0, 0},
1406                 {0, 0}
1407                 }
1408         },
1409         {1, 1, 2, 0,            /* 0xbf */
1410                 {{0, 5},
1411                 {7, 7},
1412                 {0, 0},
1413                 {0, 0}
1414                 }
1415         },
1416         {0, 1, 1, 0,            /* 0xc0 */
1417                 {{6, 7},
1418                 {0, 0},
1419                 {0, 0},
1420                 {0, 0}
1421                 }
1422         },
1423         {1, 1, 2, 0,            /* 0xc1 */
1424                 {{0, 0},
1425                 {6, 7},
1426                 {0, 0},
1427                 {0, 0}
1428                 }
1429         },
1430         {0, 1, 2, 0,            /* 0xc2 */
1431                 {{1, 1},
1432                 {6, 7},
1433                 {0, 0},
1434                 {0, 0}
1435                 }
1436         },
1437         {1, 1, 2, 0,            /* 0xc3 */
1438                 {{0, 1},
1439                 {6, 7},
1440                 {0, 0},
1441                 {0, 0}
1442                 }
1443         },
1444         {0, 1, 2, 0,            /* 0xc4 */
1445                 {{2, 2},
1446                 {6, 7},
1447                 {0, 0},
1448                 {0, 0}
1449                 }
1450         },
1451         {1, 1, 3, 0,            /* 0xc5 */
1452                 {{0, 0},
1453                 {2, 2},
1454                 {6, 7},
1455                 {0, 0}
1456                 }
1457         },
1458         {0, 1, 2, 0,            /* 0xc6 */
1459                 {{1, 2},
1460                 {6, 7},
1461                 {0, 0},
1462                 {0, 0}
1463                 }
1464         },
1465         {1, 1, 2, 0,            /* 0xc7 */
1466                 {{0, 2},
1467                 {6, 7},
1468                 {0, 0},
1469                 {0, 0}
1470                 }
1471         },
1472         {0, 1, 2, 0,            /* 0xc8 */
1473                 {{3, 3},
1474                 {6, 7},
1475                 {0, 0},
1476                 {0, 0}
1477                 }
1478         },
1479         {1, 1, 3, 0,            /* 0xc9 */
1480                 {{0, 0},
1481                 {3, 3},
1482                 {6, 7},
1483                 {0, 0}
1484                 }
1485         },
1486         {0, 1, 3, 0,            /* 0xca */
1487                 {{1, 1},
1488                 {3, 3},
1489                 {6, 7},
1490                 {0, 0}
1491                 }
1492         },
1493         {1, 1, 3, 0,            /* 0xcb */
1494                 {{0, 1},
1495                 {3, 3},
1496                 {6, 7},
1497                 {0, 0}
1498                 }
1499         },
1500         {0, 1, 2, 0,            /* 0xcc */
1501                 {{2, 3},
1502                 {6, 7},
1503                 {0, 0},
1504                 {0, 0}
1505                 }
1506         },
1507         {1, 1, 3, 0,            /* 0xcd */
1508                 {{0, 0},
1509                 {2, 3},
1510                 {6, 7},
1511                 {0, 0}
1512                 }
1513         },
1514         {0, 1, 2, 0,            /* 0xce */
1515                 {{1, 3},
1516                 {6, 7},
1517                 {0, 0},
1518                 {0, 0}
1519                 }
1520         },
1521         {1, 1, 2, 0,            /* 0xcf */
1522                 {{0, 3},
1523                 {6, 7},
1524                 {0, 0},
1525                 {0, 0}
1526                 }
1527         },
1528         {0, 1, 2, 0,            /* 0xd0 */
1529                 {{4, 4},
1530                 {6, 7},
1531                 {0, 0},
1532                 {0, 0}
1533                 }
1534         },
1535         {1, 1, 3, 0,            /* 0xd1 */
1536                 {{0, 0},
1537                 {4, 4},
1538                 {6, 7},
1539                 {0, 0}
1540                 }
1541         },
1542         {0, 1, 3, 0,            /* 0xd2 */
1543                 {{1, 1},
1544                 {4, 4},
1545                 {6, 7},
1546                 {0, 0}
1547                 }
1548         },
1549         {1, 1, 3, 0,            /* 0xd3 */
1550                 {{0, 1},
1551                 {4, 4},
1552                 {6, 7},
1553                 {0, 0}
1554                 }
1555         },
1556         {0, 1, 3, 0,            /* 0xd4 */
1557                 {{2, 2},
1558                 {4, 4},
1559                 {6, 7},
1560                 {0, 0}
1561                 }
1562         },
1563         {1, 1, 4, 0,            /* 0xd5 */
1564                 {{0, 0},
1565                 {2, 2},
1566                 {4, 4},
1567                 {6, 7}
1568                 }
1569         },
1570         {0, 1, 3, 0,            /* 0xd6 */
1571                 {{1, 2},
1572                 {4, 4},
1573                 {6, 7},
1574                 {0, 0}
1575                 }
1576         },
1577         {1, 1, 3, 0,            /* 0xd7 */
1578                 {{0, 2},
1579                 {4, 4},
1580                 {6, 7},
1581                 {0, 0}
1582                 }
1583         },
1584         {0, 1, 2, 0,            /* 0xd8 */
1585                 {{3, 4},
1586                 {6, 7},
1587                 {0, 0},
1588                 {0, 0}
1589                 }
1590         },
1591         {1, 1, 3, 0,            /* 0xd9 */
1592                 {{0, 0},
1593                 {3, 4},
1594                 {6, 7},
1595                 {0, 0}
1596                 }
1597         },
1598         {0, 1, 3, 0,            /* 0xda */
1599                 {{1, 1},
1600                 {3, 4},
1601                 {6, 7},
1602                 {0, 0}
1603                 }
1604         },
1605         {1, 1, 3, 0,            /* 0xdb */
1606                 {{0, 1},
1607                 {3, 4},
1608                 {6, 7},
1609                 {0, 0}
1610                 }
1611         },
1612         {0, 1, 2, 0,            /* 0xdc */
1613                 {{2, 4},
1614                 {6, 7},
1615                 {0, 0},
1616                 {0, 0}
1617                 }
1618         },
1619         {1, 1, 3, 0,            /* 0xdd */
1620                 {{0, 0},
1621                 {2, 4},
1622                 {6, 7},
1623                 {0, 0}
1624                 }
1625         },
1626         {0, 1, 2, 0,            /* 0xde */
1627                 {{1, 4},
1628                 {6, 7},
1629                 {0, 0},
1630                 {0, 0}
1631                 }
1632         },
1633         {1, 1, 2, 0,            /* 0xdf */
1634                 {{0, 4},
1635                 {6, 7},
1636                 {0, 0},
1637                 {0, 0}
1638                 }
1639         },
1640         {0, 1, 1, 0,            /* 0xe0 */
1641                 {{5, 7},
1642                 {0, 0},
1643                 {0, 0},
1644                 {0, 0}
1645                 }
1646         },
1647         {1, 1, 2, 0,            /* 0xe1 */
1648                 {{0, 0},
1649                 {5, 7},
1650                 {0, 0},
1651                 {0, 0}
1652                 }
1653         },
1654         {0, 1, 2, 0,            /* 0xe2 */
1655                 {{1, 1},
1656                 {5, 7},
1657                 {0, 0},
1658                 {0, 0}
1659                 }
1660         },
1661         {1, 1, 2, 0,            /* 0xe3 */
1662                 {{0, 1},
1663                 {5, 7},
1664                 {0, 0},
1665                 {0, 0}
1666                 }
1667         },
1668         {0, 1, 2, 0,            /* 0xe4 */
1669                 {{2, 2},
1670                 {5, 7},
1671                 {0, 0},
1672                 {0, 0}
1673                 }
1674         },
1675         {1, 1, 3, 0,            /* 0xe5 */
1676                 {{0, 0},
1677                 {2, 2},
1678                 {5, 7},
1679                 {0, 0}
1680                 }
1681         },
1682         {0, 1, 2, 0,            /* 0xe6 */
1683                 {{1, 2},
1684                 {5, 7},
1685                 {0, 0},
1686                 {0, 0}
1687                 }
1688         },
1689         {1, 1, 2, 0,            /* 0xe7 */
1690                 {{0, 2},
1691                 {5, 7},
1692                 {0, 0},
1693                 {0, 0}
1694                 }
1695         },
1696         {0, 1, 2, 0,            /* 0xe8 */
1697                 {{3, 3},
1698                 {5, 7},
1699                 {0, 0},
1700                 {0, 0}
1701                 }
1702         },
1703         {1, 1, 3, 0,            /* 0xe9 */
1704                 {{0, 0},
1705                 {3, 3},
1706                 {5, 7},
1707                 {0, 0}
1708                 }
1709         },
1710         {0, 1, 3, 0,            /* 0xea */
1711                 {{1, 1},
1712                 {3, 3},
1713                 {5, 7},
1714                 {0, 0}
1715                 }
1716         },
1717         {1, 1, 3, 0,            /* 0xeb */
1718                 {{0, 1},
1719                 {3, 3},
1720                 {5, 7},
1721                 {0, 0}
1722                 }
1723         },
1724         {0, 1, 2, 0,            /* 0xec */
1725                 {{2, 3},
1726                 {5, 7},
1727                 {0, 0},
1728                 {0, 0}
1729                 }
1730         },
1731         {1, 1, 3, 0,            /* 0xed */
1732                 {{0, 0},
1733                 {2, 3},
1734                 {5, 7},
1735                 {0, 0}
1736                 }
1737         },
1738         {0, 1, 2, 0,            /* 0xee */
1739                 {{1, 3},
1740                 {5, 7},
1741                 {0, 0},
1742                 {0, 0}
1743                 }
1744         },
1745         {1, 1, 2, 0,            /* 0xef */
1746                 {{0, 3},
1747                 {5, 7},
1748                 {0, 0},
1749                 {0, 0}
1750                 }
1751         },
1752         {0, 1, 1, 0,            /* 0xf0 */
1753                 {{4, 7},
1754                 {0, 0},
1755                 {0, 0},
1756                 {0, 0}
1757                 }
1758         },
1759         {1, 1, 2, 0,            /* 0xf1 */
1760                 {{0, 0},
1761                 {4, 7},
1762                 {0, 0},
1763                 {0, 0}
1764                 }
1765         },
1766         {0, 1, 2, 0,            /* 0xf2 */
1767                 {{1, 1},
1768                 {4, 7},
1769                 {0, 0},
1770                 {0, 0}
1771                 }
1772         },
1773         {1, 1, 2, 0,            /* 0xf3 */
1774                 {{0, 1},
1775                 {4, 7},
1776                 {0, 0},
1777                 {0, 0}
1778                 }
1779         },
1780         {0, 1, 2, 0,            /* 0xf4 */
1781                 {{2, 2},
1782                 {4, 7},
1783                 {0, 0},
1784                 {0, 0}
1785                 }
1786         },
1787         {1, 1, 3, 0,            /* 0xf5 */
1788                 {{0, 0},
1789                 {2, 2},
1790                 {4, 7},
1791                 {0, 0}
1792                 }
1793         },
1794         {0, 1, 2, 0,            /* 0xf6 */
1795                 {{1, 2},
1796                 {4, 7},
1797                 {0, 0},
1798                 {0, 0}
1799                 }
1800         },
1801         {1, 1, 2, 0,            /* 0xf7 */
1802                 {{0, 2},
1803                 {4, 7},
1804                 {0, 0},
1805                 {0, 0}
1806                 }
1807         },
1808         {0, 1, 1, 0,            /* 0xf8 */
1809                 {{3, 7},
1810                 {0, 0},
1811                 {0, 0},
1812                 {0, 0}
1813                 }
1814         },
1815         {1, 1, 2, 0,            /* 0xf9 */
1816                 {{0, 0},
1817                 {3, 7},
1818                 {0, 0},
1819                 {0, 0}
1820                 }
1821         },
1822         {0, 1, 2, 0,            /* 0xfa */
1823                 {{1, 1},
1824                 {3, 7},
1825                 {0, 0},
1826                 {0, 0}
1827                 }
1828         },
1829         {1, 1, 2, 0,            /* 0xfb */
1830                 {{0, 1},
1831                 {3, 7},
1832                 {0, 0},
1833                 {0, 0}
1834                 }
1835         },
1836         {0, 1, 1, 0,            /* 0xfc */
1837                 {{2, 7},
1838                 {0, 0},
1839                 {0, 0},
1840                 {0, 0}
1841                 }
1842         },
1843         {1, 1, 2, 0,            /* 0xfd */
1844                 {{0, 0},
1845                 {2, 7},
1846                 {0, 0},
1847                 {0, 0}
1848                 }
1849         },
1850         {0, 1, 1, 0,            /* 0xfe */
1851                 {{1, 7},
1852                 {0, 0},
1853                 {0, 0},
1854                 {0, 0}
1855                 }
1856         },
1857         {1, 1, 1, 0,            /* 0xff */
1858                 {{0, 7},
1859                 {0, 0},
1860                 {0, 0},
1861                 {0, 0}
1862                 }
1863         }
1864 };
1865
1866 int
1867 sctp_is_address_in_scope(struct sctp_ifa *ifa,
1868     struct sctp_scoping *scope,
1869     int do_update)
1870 {
1871         if ((scope->loopback_scope == 0) &&
1872             (ifa->ifn_p) && SCTP_IFN_IS_IFT_LOOP(ifa->ifn_p)) {
1873                 /*
1874                  * skip loopback if not in scope *
1875                  */
1876                 return (0);
1877         }
1878         switch (ifa->address.sa.sa_family) {
1879 #ifdef INET
1880         case AF_INET:
1881                 if (scope->ipv4_addr_legal) {
1882                         struct sockaddr_in *sin;
1883
1884                         sin = &ifa->address.sin;
1885                         if (sin->sin_addr.s_addr == 0) {
1886                                 /* not in scope , unspecified */
1887                                 return (0);
1888                         }
1889                         if ((scope->ipv4_local_scope == 0) &&
1890                             (IN4_ISPRIVATE_ADDRESS(&sin->sin_addr))) {
1891                                 /* private address not in scope */
1892                                 return (0);
1893                         }
1894                 } else {
1895                         return (0);
1896                 }
1897                 break;
1898 #endif
1899 #ifdef INET6
1900         case AF_INET6:
1901                 if (scope->ipv6_addr_legal) {
1902                         struct sockaddr_in6 *sin6;
1903
1904                         /*
1905                          * Must update the flags,  bummer, which means any
1906                          * IFA locks must now be applied HERE <->
1907                          */
1908                         if (do_update) {
1909                                 sctp_gather_internal_ifa_flags(ifa);
1910                         }
1911                         if (ifa->localifa_flags & SCTP_ADDR_IFA_UNUSEABLE) {
1912                                 return (0);
1913                         }
1914                         /* ok to use deprecated addresses? */
1915                         sin6 = &ifa->address.sin6;
1916                         if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) {
1917                                 /* skip unspecifed addresses */
1918                                 return (0);
1919                         }
1920                         if (    /* (local_scope == 0) && */
1921                             (IN6_IS_ADDR_LINKLOCAL(&sin6->sin6_addr))) {
1922                                 return (0);
1923                         }
1924                         if ((scope->site_scope == 0) &&
1925                             (IN6_IS_ADDR_SITELOCAL(&sin6->sin6_addr))) {
1926                                 return (0);
1927                         }
1928                 } else {
1929                         return (0);
1930                 }
1931                 break;
1932 #endif
1933         default:
1934                 return (0);
1935         }
1936         return (1);
1937 }
1938
1939 static struct mbuf *
1940 sctp_add_addr_to_mbuf(struct mbuf *m, struct sctp_ifa *ifa, uint16_t *len)
1941 {
1942 #if defined(INET) || defined(INET6)
1943         struct sctp_paramhdr *paramh;
1944         struct mbuf *mret;
1945         uint16_t plen;
1946 #endif
1947
1948         switch (ifa->address.sa.sa_family) {
1949 #ifdef INET
1950         case AF_INET:
1951                 plen = (uint16_t)sizeof(struct sctp_ipv4addr_param);
1952                 break;
1953 #endif
1954 #ifdef INET6
1955         case AF_INET6:
1956                 plen = (uint16_t)sizeof(struct sctp_ipv6addr_param);
1957                 break;
1958 #endif
1959         default:
1960                 return (m);
1961         }
1962 #if defined(INET) || defined(INET6)
1963         if (M_TRAILINGSPACE(m) >= plen) {
1964                 /* easy side we just drop it on the end */
1965                 paramh = (struct sctp_paramhdr *)(SCTP_BUF_AT(m, SCTP_BUF_LEN(m)));
1966                 mret = m;
1967         } else {
1968                 /* Need more space */
1969                 mret = m;
1970                 while (SCTP_BUF_NEXT(mret) != NULL) {
1971                         mret = SCTP_BUF_NEXT(mret);
1972                 }
1973                 SCTP_BUF_NEXT(mret) = sctp_get_mbuf_for_msg(plen, 0, M_NOWAIT, 1, MT_DATA);
1974                 if (SCTP_BUF_NEXT(mret) == NULL) {
1975                         /* We are hosed, can't add more addresses */
1976                         return (m);
1977                 }
1978                 mret = SCTP_BUF_NEXT(mret);
1979                 paramh = mtod(mret, struct sctp_paramhdr *);
1980         }
1981         /* now add the parameter */
1982         switch (ifa->address.sa.sa_family) {
1983 #ifdef INET
1984         case AF_INET:
1985                 {
1986                         struct sctp_ipv4addr_param *ipv4p;
1987                         struct sockaddr_in *sin;
1988
1989                         sin = &ifa->address.sin;
1990                         ipv4p = (struct sctp_ipv4addr_param *)paramh;
1991                         paramh->param_type = htons(SCTP_IPV4_ADDRESS);
1992                         paramh->param_length = htons(plen);
1993                         ipv4p->addr = sin->sin_addr.s_addr;
1994                         SCTP_BUF_LEN(mret) += plen;
1995                         break;
1996                 }
1997 #endif
1998 #ifdef INET6
1999         case AF_INET6:
2000                 {
2001                         struct sctp_ipv6addr_param *ipv6p;
2002                         struct sockaddr_in6 *sin6;
2003
2004                         sin6 = &ifa->address.sin6;
2005                         ipv6p = (struct sctp_ipv6addr_param *)paramh;
2006                         paramh->param_type = htons(SCTP_IPV6_ADDRESS);
2007                         paramh->param_length = htons(plen);
2008                         memcpy(ipv6p->addr, &sin6->sin6_addr,
2009                             sizeof(ipv6p->addr));
2010                         /* clear embedded scope in the address */
2011                         in6_clearscope((struct in6_addr *)ipv6p->addr);
2012                         SCTP_BUF_LEN(mret) += plen;
2013                         break;
2014                 }
2015 #endif
2016         default:
2017                 return (m);
2018         }
2019         if (len != NULL) {
2020                 *len += plen;
2021         }
2022         return (mret);
2023 #endif
2024 }
2025
2026 struct mbuf *
2027 sctp_add_addresses_to_i_ia(struct sctp_inpcb *inp, struct sctp_tcb *stcb,
2028     struct sctp_scoping *scope,
2029     struct mbuf *m_at, int cnt_inits_to,
2030     uint16_t *padding_len, uint16_t *chunk_len)
2031 {
2032         struct sctp_vrf *vrf = NULL;
2033         int cnt, limit_out = 0, total_count;
2034         uint32_t vrf_id;
2035
2036         vrf_id = inp->def_vrf_id;
2037         SCTP_IPI_ADDR_RLOCK();
2038         vrf = sctp_find_vrf(vrf_id);
2039         if (vrf == NULL) {
2040                 SCTP_IPI_ADDR_RUNLOCK();
2041                 return (m_at);
2042         }
2043         if (inp->sctp_flags & SCTP_PCB_FLAGS_BOUNDALL) {
2044                 struct sctp_ifa *sctp_ifap;
2045                 struct sctp_ifn *sctp_ifnp;
2046
2047                 cnt = cnt_inits_to;
2048                 if (vrf->total_ifa_count > SCTP_COUNT_LIMIT) {
2049                         limit_out = 1;
2050                         cnt = SCTP_ADDRESS_LIMIT;
2051                         goto skip_count;
2052                 }
2053                 LIST_FOREACH(sctp_ifnp, &vrf->ifnlist, next_ifn) {
2054                         if ((scope->loopback_scope == 0) &&
2055                             SCTP_IFN_IS_IFT_LOOP(sctp_ifnp)) {
2056                                 /*
2057                                  * Skip loopback devices if loopback_scope
2058                                  * not set
2059                                  */
2060                                 continue;
2061                         }
2062                         LIST_FOREACH(sctp_ifap, &sctp_ifnp->ifalist, next_ifa) {
2063 #ifdef INET
2064                                 if ((sctp_ifap->address.sa.sa_family == AF_INET) &&
2065                                     (prison_check_ip4(inp->ip_inp.inp.inp_cred,
2066                                     &sctp_ifap->address.sin.sin_addr) != 0)) {
2067                                         continue;
2068                                 }
2069 #endif
2070 #ifdef INET6
2071                                 if ((sctp_ifap->address.sa.sa_family == AF_INET6) &&
2072                                     (prison_check_ip6(inp->ip_inp.inp.inp_cred,
2073                                     &sctp_ifap->address.sin6.sin6_addr) != 0)) {
2074                                         continue;
2075                                 }
2076 #endif
2077                                 if (sctp_is_addr_restricted(stcb, sctp_ifap)) {
2078                                         continue;
2079                                 }
2080                                 if (sctp_is_address_in_scope(sctp_ifap, scope, 1) == 0) {
2081                                         continue;
2082                                 }
2083                                 cnt++;
2084                                 if (cnt > SCTP_ADDRESS_LIMIT) {
2085                                         break;
2086                                 }
2087                         }
2088                         if (cnt > SCTP_ADDRESS_LIMIT) {
2089                                 break;
2090                         }
2091                 }
2092 skip_count:
2093                 if (cnt > 1) {
2094                         total_count = 0;
2095                         LIST_FOREACH(sctp_ifnp, &vrf->ifnlist, next_ifn) {
2096                                 cnt = 0;
2097                                 if ((scope->loopback_scope == 0) &&
2098                                     SCTP_IFN_IS_IFT_LOOP(sctp_ifnp)) {
2099                                         /*
2100                                          * Skip loopback devices if
2101                                          * loopback_scope not set
2102                                          */
2103                                         continue;
2104                                 }
2105                                 LIST_FOREACH(sctp_ifap, &sctp_ifnp->ifalist, next_ifa) {
2106 #ifdef INET
2107                                         if ((sctp_ifap->address.sa.sa_family == AF_INET) &&
2108                                             (prison_check_ip4(inp->ip_inp.inp.inp_cred,
2109                                             &sctp_ifap->address.sin.sin_addr) != 0)) {
2110                                                 continue;
2111                                         }
2112 #endif
2113 #ifdef INET6
2114                                         if ((sctp_ifap->address.sa.sa_family == AF_INET6) &&
2115                                             (prison_check_ip6(inp->ip_inp.inp.inp_cred,
2116                                             &sctp_ifap->address.sin6.sin6_addr) != 0)) {
2117                                                 continue;
2118                                         }
2119 #endif
2120                                         if (sctp_is_addr_restricted(stcb, sctp_ifap)) {
2121                                                 continue;
2122                                         }
2123                                         if (sctp_is_address_in_scope(sctp_ifap,
2124                                             scope, 0) == 0) {
2125                                                 continue;
2126                                         }
2127                                         if ((chunk_len != NULL) &&
2128                                             (padding_len != NULL) &&
2129                                             (*padding_len > 0)) {
2130                                                 memset(mtod(m_at, caddr_t)+*chunk_len, 0, *padding_len);
2131                                                 SCTP_BUF_LEN(m_at) += *padding_len;
2132                                                 *chunk_len += *padding_len;
2133                                                 *padding_len = 0;
2134                                         }
2135                                         m_at = sctp_add_addr_to_mbuf(m_at, sctp_ifap, chunk_len);
2136                                         if (limit_out) {
2137                                                 cnt++;
2138                                                 total_count++;
2139                                                 if (cnt >= 2) {
2140                                                         /*
2141                                                          * two from each
2142                                                          * address
2143                                                          */
2144                                                         break;
2145                                                 }
2146                                                 if (total_count > SCTP_ADDRESS_LIMIT) {
2147                                                         /* No more addresses */
2148                                                         break;
2149                                                 }
2150                                         }
2151                                 }
2152                         }
2153                 }
2154         } else {
2155                 struct sctp_laddr *laddr;
2156
2157                 cnt = cnt_inits_to;
2158                 /* First, how many ? */
2159                 LIST_FOREACH(laddr, &inp->sctp_addr_list, sctp_nxt_addr) {
2160                         if (laddr->ifa == NULL) {
2161                                 continue;
2162                         }
2163                         if (laddr->ifa->localifa_flags & SCTP_BEING_DELETED)
2164                                 /*
2165                                  * Address being deleted by the system, dont
2166                                  * list.
2167                                  */
2168                                 continue;
2169                         if (laddr->action == SCTP_DEL_IP_ADDRESS) {
2170                                 /*
2171                                  * Address being deleted on this ep don't
2172                                  * list.
2173                                  */
2174                                 continue;
2175                         }
2176                         if (sctp_is_address_in_scope(laddr->ifa,
2177                             scope, 1) == 0) {
2178                                 continue;
2179                         }
2180                         cnt++;
2181                 }
2182                 /*
2183                  * To get through a NAT we only list addresses if we have
2184                  * more than one. That way if you just bind a single address
2185                  * we let the source of the init dictate our address.
2186                  */
2187                 if (cnt > 1) {
2188                         cnt = cnt_inits_to;
2189                         LIST_FOREACH(laddr, &inp->sctp_addr_list, sctp_nxt_addr) {
2190                                 if (laddr->ifa == NULL) {
2191                                         continue;
2192                                 }
2193                                 if (laddr->ifa->localifa_flags & SCTP_BEING_DELETED) {
2194                                         continue;
2195                                 }
2196                                 if (sctp_is_address_in_scope(laddr->ifa,
2197                                     scope, 0) == 0) {
2198                                         continue;
2199                                 }
2200                                 if ((chunk_len != NULL) &&
2201                                     (padding_len != NULL) &&
2202                                     (*padding_len > 0)) {
2203                                         memset(mtod(m_at, caddr_t)+*chunk_len, 0, *padding_len);
2204                                         SCTP_BUF_LEN(m_at) += *padding_len;
2205                                         *chunk_len += *padding_len;
2206                                         *padding_len = 0;
2207                                 }
2208                                 m_at = sctp_add_addr_to_mbuf(m_at, laddr->ifa, chunk_len);
2209                                 cnt++;
2210                                 if (cnt >= SCTP_ADDRESS_LIMIT) {
2211                                         break;
2212                                 }
2213                         }
2214                 }
2215         }
2216         SCTP_IPI_ADDR_RUNLOCK();
2217         return (m_at);
2218 }
2219
2220 static struct sctp_ifa *
2221 sctp_is_ifa_addr_preferred(struct sctp_ifa *ifa,
2222     uint8_t dest_is_loop,
2223     uint8_t dest_is_priv,
2224     sa_family_t fam)
2225 {
2226         uint8_t dest_is_global = 0;
2227
2228         /* dest_is_priv is true if destination is a private address */
2229         /* dest_is_loop is true if destination is a loopback addresses */
2230
2231         /**
2232          * Here we determine if its a preferred address. A preferred address
2233          * means it is the same scope or higher scope then the destination.
2234          * L = loopback, P = private, G = global
2235          * -----------------------------------------
2236          *    src    |  dest | result
2237          *  ----------------------------------------
2238          *     L     |    L  |    yes
2239          *  -----------------------------------------
2240          *     P     |    L  |    yes-v4 no-v6
2241          *  -----------------------------------------
2242          *     G     |    L  |    yes-v4 no-v6
2243          *  -----------------------------------------
2244          *     L     |    P  |    no
2245          *  -----------------------------------------
2246          *     P     |    P  |    yes
2247          *  -----------------------------------------
2248          *     G     |    P  |    no
2249          *   -----------------------------------------
2250          *     L     |    G  |    no
2251          *   -----------------------------------------
2252          *     P     |    G  |    no
2253          *    -----------------------------------------
2254          *     G     |    G  |    yes
2255          *    -----------------------------------------
2256          */
2257
2258         if (ifa->address.sa.sa_family != fam) {
2259                 /* forget mis-matched family */
2260                 return (NULL);
2261         }
2262         if ((dest_is_priv == 0) && (dest_is_loop == 0)) {
2263                 dest_is_global = 1;
2264         }
2265         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Is destination preferred:");
2266         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, &ifa->address.sa);
2267         /* Ok the address may be ok */
2268 #ifdef INET6
2269         if (fam == AF_INET6) {
2270                 /* ok to use deprecated addresses? no lets not! */
2271                 if (ifa->localifa_flags & SCTP_ADDR_IFA_UNUSEABLE) {
2272                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:1\n");
2273                         return (NULL);
2274                 }
2275                 if (ifa->src_is_priv && !ifa->src_is_loop) {
2276                         if (dest_is_loop) {
2277                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:2\n");
2278                                 return (NULL);
2279                         }
2280                 }
2281                 if (ifa->src_is_glob) {
2282                         if (dest_is_loop) {
2283                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:3\n");
2284                                 return (NULL);
2285                         }
2286                 }
2287         }
2288 #endif
2289         /*
2290          * Now that we know what is what, implement or table this could in
2291          * theory be done slicker (it used to be), but this is
2292          * straightforward and easier to validate :-)
2293          */
2294         SCTPDBG(SCTP_DEBUG_OUTPUT3, "src_loop:%d src_priv:%d src_glob:%d\n",
2295             ifa->src_is_loop, ifa->src_is_priv, ifa->src_is_glob);
2296         SCTPDBG(SCTP_DEBUG_OUTPUT3, "dest_loop:%d dest_priv:%d dest_glob:%d\n",
2297             dest_is_loop, dest_is_priv, dest_is_global);
2298
2299         if ((ifa->src_is_loop) && (dest_is_priv)) {
2300                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:4\n");
2301                 return (NULL);
2302         }
2303         if ((ifa->src_is_glob) && (dest_is_priv)) {
2304                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:5\n");
2305                 return (NULL);
2306         }
2307         if ((ifa->src_is_loop) && (dest_is_global)) {
2308                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:6\n");
2309                 return (NULL);
2310         }
2311         if ((ifa->src_is_priv) && (dest_is_global)) {
2312                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:7\n");
2313                 return (NULL);
2314         }
2315         SCTPDBG(SCTP_DEBUG_OUTPUT3, "YES\n");
2316         /* its a preferred address */
2317         return (ifa);
2318 }
2319
2320 static struct sctp_ifa *
2321 sctp_is_ifa_addr_acceptable(struct sctp_ifa *ifa,
2322     uint8_t dest_is_loop,
2323     uint8_t dest_is_priv,
2324     sa_family_t fam)
2325 {
2326         uint8_t dest_is_global = 0;
2327
2328         /**
2329          * Here we determine if its a acceptable address. A acceptable
2330          * address means it is the same scope or higher scope but we can
2331          * allow for NAT which means its ok to have a global dest and a
2332          * private src.
2333          *
2334          * L = loopback, P = private, G = global
2335          * -----------------------------------------
2336          *  src    |  dest | result
2337          * -----------------------------------------
2338          *   L     |   L   |    yes
2339          *  -----------------------------------------
2340          *   P     |   L   |    yes-v4 no-v6
2341          *  -----------------------------------------
2342          *   G     |   L   |    yes
2343          * -----------------------------------------
2344          *   L     |   P   |    no
2345          * -----------------------------------------
2346          *   P     |   P   |    yes
2347          * -----------------------------------------
2348          *   G     |   P   |    yes - May not work
2349          * -----------------------------------------
2350          *   L     |   G   |    no
2351          * -----------------------------------------
2352          *   P     |   G   |    yes - May not work
2353          * -----------------------------------------
2354          *   G     |   G   |    yes
2355          * -----------------------------------------
2356          */
2357
2358         if (ifa->address.sa.sa_family != fam) {
2359                 /* forget non matching family */
2360                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "ifa_fam:%d fam:%d\n",
2361                     ifa->address.sa.sa_family, fam);
2362                 return (NULL);
2363         }
2364         /* Ok the address may be ok */
2365         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT3, &ifa->address.sa);
2366         SCTPDBG(SCTP_DEBUG_OUTPUT3, "dst_is_loop:%d dest_is_priv:%d\n",
2367             dest_is_loop, dest_is_priv);
2368         if ((dest_is_loop == 0) && (dest_is_priv == 0)) {
2369                 dest_is_global = 1;
2370         }
2371 #ifdef INET6
2372         if (fam == AF_INET6) {
2373                 /* ok to use deprecated addresses? */
2374                 if (ifa->localifa_flags & SCTP_ADDR_IFA_UNUSEABLE) {
2375                         return (NULL);
2376                 }
2377                 if (ifa->src_is_priv) {
2378                         /* Special case, linklocal to loop */
2379                         if (dest_is_loop)
2380                                 return (NULL);
2381                 }
2382         }
2383 #endif
2384         /*
2385          * Now that we know what is what, implement our table. This could in
2386          * theory be done slicker (it used to be), but this is
2387          * straightforward and easier to validate :-)
2388          */
2389         SCTPDBG(SCTP_DEBUG_OUTPUT3, "ifa->src_is_loop:%d dest_is_priv:%d\n",
2390             ifa->src_is_loop,
2391             dest_is_priv);
2392         if ((ifa->src_is_loop == 1) && (dest_is_priv)) {
2393                 return (NULL);
2394         }
2395         SCTPDBG(SCTP_DEBUG_OUTPUT3, "ifa->src_is_loop:%d dest_is_glob:%d\n",
2396             ifa->src_is_loop,
2397             dest_is_global);
2398         if ((ifa->src_is_loop == 1) && (dest_is_global)) {
2399                 return (NULL);
2400         }
2401         SCTPDBG(SCTP_DEBUG_OUTPUT3, "address is acceptable\n");
2402         /* its an acceptable address */
2403         return (ifa);
2404 }
2405
2406 int
2407 sctp_is_addr_restricted(struct sctp_tcb *stcb, struct sctp_ifa *ifa)
2408 {
2409         struct sctp_laddr *laddr;
2410
2411         if (stcb == NULL) {
2412                 /* There are no restrictions, no TCB :-) */
2413                 return (0);
2414         }
2415         LIST_FOREACH(laddr, &stcb->asoc.sctp_restricted_addrs, sctp_nxt_addr) {
2416                 if (laddr->ifa == NULL) {
2417                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "%s: NULL ifa\n",
2418                             __func__);
2419                         continue;
2420                 }
2421                 if (laddr->ifa == ifa) {
2422                         /* Yes it is on the list */
2423                         return (1);
2424                 }
2425         }
2426         return (0);
2427 }
2428
2429 int
2430 sctp_is_addr_in_ep(struct sctp_inpcb *inp, struct sctp_ifa *ifa)
2431 {
2432         struct sctp_laddr *laddr;
2433
2434         if (ifa == NULL)
2435                 return (0);
2436         LIST_FOREACH(laddr, &inp->sctp_addr_list, sctp_nxt_addr) {
2437                 if (laddr->ifa == NULL) {
2438                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "%s: NULL ifa\n",
2439                             __func__);
2440                         continue;
2441                 }
2442                 if ((laddr->ifa == ifa) && laddr->action == 0)
2443                         /* same pointer */
2444                         return (1);
2445         }
2446         return (0);
2447 }
2448
2449 static struct sctp_ifa *
2450 sctp_choose_boundspecific_inp(struct sctp_inpcb *inp,
2451     sctp_route_t *ro,
2452     uint32_t vrf_id,
2453     int non_asoc_addr_ok,
2454     uint8_t dest_is_priv,
2455     uint8_t dest_is_loop,
2456     sa_family_t fam)
2457 {
2458         struct sctp_laddr *laddr, *starting_point;
2459         void *ifn;
2460         int resettotop = 0;
2461         struct sctp_ifn *sctp_ifn;
2462         struct sctp_ifa *sctp_ifa, *sifa;
2463         struct sctp_vrf *vrf;
2464         uint32_t ifn_index;
2465
2466         vrf = sctp_find_vrf(vrf_id);
2467         if (vrf == NULL)
2468                 return (NULL);
2469
2470         ifn = SCTP_GET_IFN_VOID_FROM_ROUTE(ro);
2471         ifn_index = SCTP_GET_IF_INDEX_FROM_ROUTE(ro);
2472         sctp_ifn = sctp_find_ifn(ifn, ifn_index);
2473         /*
2474          * first question, is the ifn we will emit on in our list, if so, we
2475          * want such an address. Note that we first looked for a preferred
2476          * address.
2477          */
2478         if (sctp_ifn) {
2479                 /* is a preferred one on the interface we route out? */
2480                 LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
2481 #ifdef INET
2482                         if ((sctp_ifa->address.sa.sa_family == AF_INET) &&
2483                             (prison_check_ip4(inp->ip_inp.inp.inp_cred,
2484                             &sctp_ifa->address.sin.sin_addr) != 0)) {
2485                                 continue;
2486                         }
2487 #endif
2488 #ifdef INET6
2489                         if ((sctp_ifa->address.sa.sa_family == AF_INET6) &&
2490                             (prison_check_ip6(inp->ip_inp.inp.inp_cred,
2491                             &sctp_ifa->address.sin6.sin6_addr) != 0)) {
2492                                 continue;
2493                         }
2494 #endif
2495                         if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
2496                             (non_asoc_addr_ok == 0))
2497                                 continue;
2498                         sifa = sctp_is_ifa_addr_preferred(sctp_ifa,
2499                             dest_is_loop,
2500                             dest_is_priv, fam);
2501                         if (sifa == NULL)
2502                                 continue;
2503                         if (sctp_is_addr_in_ep(inp, sifa)) {
2504                                 atomic_add_int(&sifa->refcount, 1);
2505                                 return (sifa);
2506                         }
2507                 }
2508         }
2509         /*
2510          * ok, now we now need to find one on the list of the addresses. We
2511          * can't get one on the emitting interface so let's find first a
2512          * preferred one. If not that an acceptable one otherwise... we
2513          * return NULL.
2514          */
2515         starting_point = inp->next_addr_touse;
2516 once_again:
2517         if (inp->next_addr_touse == NULL) {
2518                 inp->next_addr_touse = LIST_FIRST(&inp->sctp_addr_list);
2519                 resettotop = 1;
2520         }
2521         for (laddr = inp->next_addr_touse; laddr;
2522             laddr = LIST_NEXT(laddr, sctp_nxt_addr)) {
2523                 if (laddr->ifa == NULL) {
2524                         /* address has been removed */
2525                         continue;
2526                 }
2527                 if (laddr->action == SCTP_DEL_IP_ADDRESS) {
2528                         /* address is being deleted */
2529                         continue;
2530                 }
2531                 sifa = sctp_is_ifa_addr_preferred(laddr->ifa, dest_is_loop,
2532                     dest_is_priv, fam);
2533                 if (sifa == NULL)
2534                         continue;
2535                 atomic_add_int(&sifa->refcount, 1);
2536                 return (sifa);
2537         }
2538         if (resettotop == 0) {
2539                 inp->next_addr_touse = NULL;
2540                 goto once_again;
2541         }
2542
2543         inp->next_addr_touse = starting_point;
2544         resettotop = 0;
2545 once_again_too:
2546         if (inp->next_addr_touse == NULL) {
2547                 inp->next_addr_touse = LIST_FIRST(&inp->sctp_addr_list);
2548                 resettotop = 1;
2549         }
2550
2551         /* ok, what about an acceptable address in the inp */
2552         for (laddr = inp->next_addr_touse; laddr;
2553             laddr = LIST_NEXT(laddr, sctp_nxt_addr)) {
2554                 if (laddr->ifa == NULL) {
2555                         /* address has been removed */
2556                         continue;
2557                 }
2558                 if (laddr->action == SCTP_DEL_IP_ADDRESS) {
2559                         /* address is being deleted */
2560                         continue;
2561                 }
2562                 sifa = sctp_is_ifa_addr_acceptable(laddr->ifa, dest_is_loop,
2563                     dest_is_priv, fam);
2564                 if (sifa == NULL)
2565                         continue;
2566                 atomic_add_int(&sifa->refcount, 1);
2567                 return (sifa);
2568         }
2569         if (resettotop == 0) {
2570                 inp->next_addr_touse = NULL;
2571                 goto once_again_too;
2572         }
2573
2574         /*
2575          * no address bound can be a source for the destination we are in
2576          * trouble
2577          */
2578         return (NULL);
2579 }
2580
2581 static struct sctp_ifa *
2582 sctp_choose_boundspecific_stcb(struct sctp_inpcb *inp,
2583     struct sctp_tcb *stcb,
2584     sctp_route_t *ro,
2585     uint32_t vrf_id,
2586     uint8_t dest_is_priv,
2587     uint8_t dest_is_loop,
2588     int non_asoc_addr_ok,
2589     sa_family_t fam)
2590 {
2591         struct sctp_laddr *laddr, *starting_point;
2592         void *ifn;
2593         struct sctp_ifn *sctp_ifn;
2594         struct sctp_ifa *sctp_ifa, *sifa;
2595         uint8_t start_at_beginning = 0;
2596         struct sctp_vrf *vrf;
2597         uint32_t ifn_index;
2598
2599         /*
2600          * first question, is the ifn we will emit on in our list, if so, we
2601          * want that one.
2602          */
2603         vrf = sctp_find_vrf(vrf_id);
2604         if (vrf == NULL)
2605                 return (NULL);
2606
2607         ifn = SCTP_GET_IFN_VOID_FROM_ROUTE(ro);
2608         ifn_index = SCTP_GET_IF_INDEX_FROM_ROUTE(ro);
2609         sctp_ifn = sctp_find_ifn(ifn, ifn_index);
2610
2611         /*
2612          * first question, is the ifn we will emit on in our list?  If so,
2613          * we want that one. First we look for a preferred. Second, we go
2614          * for an acceptable.
2615          */
2616         if (sctp_ifn) {
2617                 /* first try for a preferred address on the ep */
2618                 LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
2619 #ifdef INET
2620                         if ((sctp_ifa->address.sa.sa_family == AF_INET) &&
2621                             (prison_check_ip4(inp->ip_inp.inp.inp_cred,
2622                             &sctp_ifa->address.sin.sin_addr) != 0)) {
2623                                 continue;
2624                         }
2625 #endif
2626 #ifdef INET6
2627                         if ((sctp_ifa->address.sa.sa_family == AF_INET6) &&
2628                             (prison_check_ip6(inp->ip_inp.inp.inp_cred,
2629                             &sctp_ifa->address.sin6.sin6_addr) != 0)) {
2630                                 continue;
2631                         }
2632 #endif
2633                         if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) && (non_asoc_addr_ok == 0))
2634                                 continue;
2635                         if (sctp_is_addr_in_ep(inp, sctp_ifa)) {
2636                                 sifa = sctp_is_ifa_addr_preferred(sctp_ifa, dest_is_loop, dest_is_priv, fam);
2637                                 if (sifa == NULL)
2638                                         continue;
2639                                 if (((non_asoc_addr_ok == 0) &&
2640                                     (sctp_is_addr_restricted(stcb, sifa))) ||
2641                                     (non_asoc_addr_ok &&
2642                                     (sctp_is_addr_restricted(stcb, sifa)) &&
2643                                     (!sctp_is_addr_pending(stcb, sifa)))) {
2644                                         /* on the no-no list */
2645                                         continue;
2646                                 }
2647                                 atomic_add_int(&sifa->refcount, 1);
2648                                 return (sifa);
2649                         }
2650                 }
2651                 /* next try for an acceptable address on the ep */
2652                 LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
2653 #ifdef INET
2654                         if ((sctp_ifa->address.sa.sa_family == AF_INET) &&
2655                             (prison_check_ip4(inp->ip_inp.inp.inp_cred,
2656                             &sctp_ifa->address.sin.sin_addr) != 0)) {
2657                                 continue;
2658                         }
2659 #endif
2660 #ifdef INET6
2661                         if ((sctp_ifa->address.sa.sa_family == AF_INET6) &&
2662                             (prison_check_ip6(inp->ip_inp.inp.inp_cred,
2663                             &sctp_ifa->address.sin6.sin6_addr) != 0)) {
2664                                 continue;
2665                         }
2666 #endif
2667                         if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) && (non_asoc_addr_ok == 0))
2668                                 continue;
2669                         if (sctp_is_addr_in_ep(inp, sctp_ifa)) {
2670                                 sifa = sctp_is_ifa_addr_acceptable(sctp_ifa, dest_is_loop, dest_is_priv, fam);
2671                                 if (sifa == NULL)
2672                                         continue;
2673                                 if (((non_asoc_addr_ok == 0) &&
2674                                     (sctp_is_addr_restricted(stcb, sifa))) ||
2675                                     (non_asoc_addr_ok &&
2676                                     (sctp_is_addr_restricted(stcb, sifa)) &&
2677                                     (!sctp_is_addr_pending(stcb, sifa)))) {
2678                                         /* on the no-no list */
2679                                         continue;
2680                                 }
2681                                 atomic_add_int(&sifa->refcount, 1);
2682                                 return (sifa);
2683                         }
2684                 }
2685         }
2686         /*
2687          * if we can't find one like that then we must look at all addresses
2688          * bound to pick one at first preferable then secondly acceptable.
2689          */
2690         starting_point = stcb->asoc.last_used_address;
2691 sctp_from_the_top:
2692         if (stcb->asoc.last_used_address == NULL) {
2693                 start_at_beginning = 1;
2694                 stcb->asoc.last_used_address = LIST_FIRST(&inp->sctp_addr_list);
2695         }
2696         /* search beginning with the last used address */
2697         for (laddr = stcb->asoc.last_used_address; laddr;
2698             laddr = LIST_NEXT(laddr, sctp_nxt_addr)) {
2699                 if (laddr->ifa == NULL) {
2700                         /* address has been removed */
2701                         continue;
2702                 }
2703                 if (laddr->action == SCTP_DEL_IP_ADDRESS) {
2704                         /* address is being deleted */
2705                         continue;
2706                 }
2707                 sifa = sctp_is_ifa_addr_preferred(laddr->ifa, dest_is_loop, dest_is_priv, fam);
2708                 if (sifa == NULL)
2709                         continue;
2710                 if (((non_asoc_addr_ok == 0) &&
2711                     (sctp_is_addr_restricted(stcb, sifa))) ||
2712                     (non_asoc_addr_ok &&
2713                     (sctp_is_addr_restricted(stcb, sifa)) &&
2714                     (!sctp_is_addr_pending(stcb, sifa)))) {
2715                         /* on the no-no list */
2716                         continue;
2717                 }
2718                 stcb->asoc.last_used_address = laddr;
2719                 atomic_add_int(&sifa->refcount, 1);
2720                 return (sifa);
2721         }
2722         if (start_at_beginning == 0) {
2723                 stcb->asoc.last_used_address = NULL;
2724                 goto sctp_from_the_top;
2725         }
2726         /* now try for any higher scope than the destination */
2727         stcb->asoc.last_used_address = starting_point;
2728         start_at_beginning = 0;
2729 sctp_from_the_top2:
2730         if (stcb->asoc.last_used_address == NULL) {
2731                 start_at_beginning = 1;
2732                 stcb->asoc.last_used_address = LIST_FIRST(&inp->sctp_addr_list);
2733         }
2734         /* search beginning with the last used address */
2735         for (laddr = stcb->asoc.last_used_address; laddr;
2736             laddr = LIST_NEXT(laddr, sctp_nxt_addr)) {
2737                 if (laddr->ifa == NULL) {
2738                         /* address has been removed */
2739                         continue;
2740                 }
2741                 if (laddr->action == SCTP_DEL_IP_ADDRESS) {
2742                         /* address is being deleted */
2743                         continue;
2744                 }
2745                 sifa = sctp_is_ifa_addr_acceptable(laddr->ifa, dest_is_loop,
2746                     dest_is_priv, fam);
2747                 if (sifa == NULL)
2748                         continue;
2749                 if (((non_asoc_addr_ok == 0) &&
2750                     (sctp_is_addr_restricted(stcb, sifa))) ||
2751                     (non_asoc_addr_ok &&
2752                     (sctp_is_addr_restricted(stcb, sifa)) &&
2753                     (!sctp_is_addr_pending(stcb, sifa)))) {
2754                         /* on the no-no list */
2755                         continue;
2756                 }
2757                 stcb->asoc.last_used_address = laddr;
2758                 atomic_add_int(&sifa->refcount, 1);
2759                 return (sifa);
2760         }
2761         if (start_at_beginning == 0) {
2762                 stcb->asoc.last_used_address = NULL;
2763                 goto sctp_from_the_top2;
2764         }
2765         return (NULL);
2766 }
2767
2768 static struct sctp_ifa *
2769 sctp_select_nth_preferred_addr_from_ifn_boundall(struct sctp_ifn *ifn,
2770     struct sctp_inpcb *inp,
2771     struct sctp_tcb *stcb,
2772     int non_asoc_addr_ok,
2773     uint8_t dest_is_loop,
2774     uint8_t dest_is_priv,
2775     int addr_wanted,
2776     sa_family_t fam,
2777     sctp_route_t *ro)
2778 {
2779         struct sctp_ifa *ifa, *sifa;
2780         int num_eligible_addr = 0;
2781 #ifdef INET6
2782         struct sockaddr_in6 sin6, lsa6;
2783
2784         if (fam == AF_INET6) {
2785                 memcpy(&sin6, &ro->ro_dst, sizeof(struct sockaddr_in6));
2786                 (void)sa6_recoverscope(&sin6);
2787         }
2788 #endif                          /* INET6 */
2789         LIST_FOREACH(ifa, &ifn->ifalist, next_ifa) {
2790 #ifdef INET
2791                 if ((ifa->address.sa.sa_family == AF_INET) &&
2792                     (prison_check_ip4(inp->ip_inp.inp.inp_cred,
2793                     &ifa->address.sin.sin_addr) != 0)) {
2794                         continue;
2795                 }
2796 #endif
2797 #ifdef INET6
2798                 if ((ifa->address.sa.sa_family == AF_INET6) &&
2799                     (prison_check_ip6(inp->ip_inp.inp.inp_cred,
2800                     &ifa->address.sin6.sin6_addr) != 0)) {
2801                         continue;
2802                 }
2803 #endif
2804                 if ((ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
2805                     (non_asoc_addr_ok == 0))
2806                         continue;
2807                 sifa = sctp_is_ifa_addr_preferred(ifa, dest_is_loop,
2808                     dest_is_priv, fam);
2809                 if (sifa == NULL)
2810                         continue;
2811 #ifdef INET6
2812                 if (fam == AF_INET6 &&
2813                     dest_is_loop &&
2814                     sifa->src_is_loop && sifa->src_is_priv) {
2815                         /*
2816                          * don't allow fe80::1 to be a src on loop ::1, we
2817                          * don't list it to the peer so we will get an
2818                          * abort.
2819                          */
2820                         continue;
2821                 }
2822                 if (fam == AF_INET6 &&
2823                     IN6_IS_ADDR_LINKLOCAL(&sifa->address.sin6.sin6_addr) &&
2824                     IN6_IS_ADDR_LINKLOCAL(&sin6.sin6_addr)) {
2825                         /*
2826                          * link-local <-> link-local must belong to the same
2827                          * scope.
2828                          */
2829                         memcpy(&lsa6, &sifa->address.sin6, sizeof(struct sockaddr_in6));
2830                         (void)sa6_recoverscope(&lsa6);
2831                         if (sin6.sin6_scope_id != lsa6.sin6_scope_id) {
2832                                 continue;
2833                         }
2834                 }
2835 #endif                          /* INET6 */
2836
2837                 /*
2838                  * Check if the IPv6 address matches to next-hop. In the
2839                  * mobile case, old IPv6 address may be not deleted from the
2840                  * interface. Then, the interface has previous and new
2841                  * addresses.  We should use one corresponding to the
2842                  * next-hop.  (by micchie)
2843                  */
2844 #ifdef INET6
2845                 if (stcb && fam == AF_INET6 &&
2846                     sctp_is_mobility_feature_on(stcb->sctp_ep, SCTP_MOBILITY_BASE)) {
2847                         if (sctp_v6src_match_nexthop(&sifa->address.sin6, ro)
2848                             == 0) {
2849                                 continue;
2850                         }
2851                 }
2852 #endif
2853 #ifdef INET
2854                 /* Avoid topologically incorrect IPv4 address */
2855                 if (stcb && fam == AF_INET &&
2856                     sctp_is_mobility_feature_on(stcb->sctp_ep, SCTP_MOBILITY_BASE)) {
2857                         if (sctp_v4src_match_nexthop(sifa, ro) == 0) {
2858                                 continue;
2859                         }
2860                 }
2861 #endif
2862                 if (stcb) {
2863                         if (sctp_is_address_in_scope(ifa, &stcb->asoc.scope, 0) == 0) {
2864                                 continue;
2865                         }
2866                         if (((non_asoc_addr_ok == 0) &&
2867                             (sctp_is_addr_restricted(stcb, sifa))) ||
2868                             (non_asoc_addr_ok &&
2869                             (sctp_is_addr_restricted(stcb, sifa)) &&
2870                             (!sctp_is_addr_pending(stcb, sifa)))) {
2871                                 /*
2872                                  * It is restricted for some reason..
2873                                  * probably not yet added.
2874                                  */
2875                                 continue;
2876                         }
2877                 }
2878                 if (num_eligible_addr >= addr_wanted) {
2879                         return (sifa);
2880                 }
2881                 num_eligible_addr++;
2882         }
2883         return (NULL);
2884 }
2885
2886 static int
2887 sctp_count_num_preferred_boundall(struct sctp_ifn *ifn,
2888     struct sctp_inpcb *inp,
2889     struct sctp_tcb *stcb,
2890     int non_asoc_addr_ok,
2891     uint8_t dest_is_loop,
2892     uint8_t dest_is_priv,
2893     sa_family_t fam)
2894 {
2895         struct sctp_ifa *ifa, *sifa;
2896         int num_eligible_addr = 0;
2897
2898         LIST_FOREACH(ifa, &ifn->ifalist, next_ifa) {
2899 #ifdef INET
2900                 if ((ifa->address.sa.sa_family == AF_INET) &&
2901                     (prison_check_ip4(inp->ip_inp.inp.inp_cred,
2902                     &ifa->address.sin.sin_addr) != 0)) {
2903                         continue;
2904                 }
2905 #endif
2906 #ifdef INET6
2907                 if ((ifa->address.sa.sa_family == AF_INET6) &&
2908                     (stcb != NULL) &&
2909                     (prison_check_ip6(inp->ip_inp.inp.inp_cred,
2910                     &ifa->address.sin6.sin6_addr) != 0)) {
2911                         continue;
2912                 }
2913 #endif
2914                 if ((ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
2915                     (non_asoc_addr_ok == 0)) {
2916                         continue;
2917                 }
2918                 sifa = sctp_is_ifa_addr_preferred(ifa, dest_is_loop,
2919                     dest_is_priv, fam);
2920                 if (sifa == NULL) {
2921                         continue;
2922                 }
2923                 if (stcb) {
2924                         if (sctp_is_address_in_scope(ifa, &stcb->asoc.scope, 0) == 0) {
2925                                 continue;
2926                         }
2927                         if (((non_asoc_addr_ok == 0) &&
2928                             (sctp_is_addr_restricted(stcb, sifa))) ||
2929                             (non_asoc_addr_ok &&
2930                             (sctp_is_addr_restricted(stcb, sifa)) &&
2931                             (!sctp_is_addr_pending(stcb, sifa)))) {
2932                                 /*
2933                                  * It is restricted for some reason..
2934                                  * probably not yet added.
2935                                  */
2936                                 continue;
2937                         }
2938                 }
2939                 num_eligible_addr++;
2940         }
2941         return (num_eligible_addr);
2942 }
2943
2944 static struct sctp_ifa *
2945 sctp_choose_boundall(struct sctp_inpcb *inp,
2946     struct sctp_tcb *stcb,
2947     struct sctp_nets *net,
2948     sctp_route_t *ro,
2949     uint32_t vrf_id,
2950     uint8_t dest_is_priv,
2951     uint8_t dest_is_loop,
2952     int non_asoc_addr_ok,
2953     sa_family_t fam)
2954 {
2955         int cur_addr_num = 0, num_preferred = 0;
2956         void *ifn;
2957         struct sctp_ifn *sctp_ifn, *looked_at = NULL, *emit_ifn;
2958         struct sctp_ifa *sctp_ifa, *sifa;
2959         uint32_t ifn_index;
2960         struct sctp_vrf *vrf;
2961 #ifdef INET
2962         int retried = 0;
2963 #endif
2964
2965         /*-
2966          * For boundall we can use any address in the association.
2967          * If non_asoc_addr_ok is set we can use any address (at least in
2968          * theory). So we look for preferred addresses first. If we find one,
2969          * we use it. Otherwise we next try to get an address on the
2970          * interface, which we should be able to do (unless non_asoc_addr_ok
2971          * is false and we are routed out that way). In these cases where we
2972          * can't use the address of the interface we go through all the
2973          * ifn's looking for an address we can use and fill that in. Punting
2974          * means we send back address 0, which will probably cause problems
2975          * actually since then IP will fill in the address of the route ifn,
2976          * which means we probably already rejected it.. i.e. here comes an
2977          * abort :-<.
2978          */
2979         vrf = sctp_find_vrf(vrf_id);
2980         if (vrf == NULL)
2981                 return (NULL);
2982
2983         ifn = SCTP_GET_IFN_VOID_FROM_ROUTE(ro);
2984         ifn_index = SCTP_GET_IF_INDEX_FROM_ROUTE(ro);
2985         SCTPDBG(SCTP_DEBUG_OUTPUT2, "ifn from route:%p ifn_index:%d\n", ifn, ifn_index);
2986         emit_ifn = looked_at = sctp_ifn = sctp_find_ifn(ifn, ifn_index);
2987         if (sctp_ifn == NULL) {
2988                 /* ?? We don't have this guy ?? */
2989                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "No ifn emit interface?\n");
2990                 goto bound_all_plan_b;
2991         }
2992         SCTPDBG(SCTP_DEBUG_OUTPUT2, "ifn_index:%d name:%s is emit interface\n",
2993             ifn_index, sctp_ifn->ifn_name);
2994
2995         if (net) {
2996                 cur_addr_num = net->indx_of_eligible_next_to_use;
2997         }
2998         num_preferred = sctp_count_num_preferred_boundall(sctp_ifn,
2999             inp, stcb,
3000             non_asoc_addr_ok,
3001             dest_is_loop,
3002             dest_is_priv, fam);
3003         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Found %d preferred source addresses for intf:%s\n",
3004             num_preferred, sctp_ifn->ifn_name);
3005         if (num_preferred == 0) {
3006                 /*
3007                  * no eligible addresses, we must use some other interface
3008                  * address if we can find one.
3009                  */
3010                 goto bound_all_plan_b;
3011         }
3012         /*
3013          * Ok we have num_eligible_addr set with how many we can use, this
3014          * may vary from call to call due to addresses being deprecated
3015          * etc..
3016          */
3017         if (cur_addr_num >= num_preferred) {
3018                 cur_addr_num = 0;
3019         }
3020         /*
3021          * select the nth address from the list (where cur_addr_num is the
3022          * nth) and 0 is the first one, 1 is the second one etc...
3023          */
3024         SCTPDBG(SCTP_DEBUG_OUTPUT2, "cur_addr_num:%d\n", cur_addr_num);
3025
3026         sctp_ifa = sctp_select_nth_preferred_addr_from_ifn_boundall(sctp_ifn, inp, stcb, non_asoc_addr_ok, dest_is_loop,
3027             dest_is_priv, cur_addr_num, fam, ro);
3028
3029         /* if sctp_ifa is NULL something changed??, fall to plan b. */
3030         if (sctp_ifa) {
3031                 atomic_add_int(&sctp_ifa->refcount, 1);
3032                 if (net) {
3033                         /* save off where the next one we will want */
3034                         net->indx_of_eligible_next_to_use = cur_addr_num + 1;
3035                 }
3036                 return (sctp_ifa);
3037         }
3038         /*
3039          * plan_b: Look at all interfaces and find a preferred address. If
3040          * no preferred fall through to plan_c.
3041          */
3042 bound_all_plan_b:
3043         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Trying Plan B\n");
3044         LIST_FOREACH(sctp_ifn, &vrf->ifnlist, next_ifn) {
3045                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "Examine interface %s\n",
3046                     sctp_ifn->ifn_name);
3047                 if (dest_is_loop == 0 && SCTP_IFN_IS_IFT_LOOP(sctp_ifn)) {
3048                         /* wrong base scope */
3049                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "skip\n");
3050                         continue;
3051                 }
3052                 if ((sctp_ifn == looked_at) && looked_at) {
3053                         /* already looked at this guy */
3054                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "already seen\n");
3055                         continue;
3056                 }
3057                 num_preferred = sctp_count_num_preferred_boundall(sctp_ifn, inp, stcb, non_asoc_addr_ok,
3058                     dest_is_loop, dest_is_priv, fam);
3059                 SCTPDBG(SCTP_DEBUG_OUTPUT2,
3060                     "Found ifn:%p %d preferred source addresses\n",
3061                     ifn, num_preferred);
3062                 if (num_preferred == 0) {
3063                         /* None on this interface. */
3064                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "No preferred -- skipping to next\n");
3065                         continue;
3066                 }
3067                 SCTPDBG(SCTP_DEBUG_OUTPUT2,
3068                     "num preferred:%d on interface:%p cur_addr_num:%d\n",
3069                     num_preferred, (void *)sctp_ifn, cur_addr_num);
3070
3071                 /*
3072                  * Ok we have num_eligible_addr set with how many we can
3073                  * use, this may vary from call to call due to addresses
3074                  * being deprecated etc..
3075                  */
3076                 if (cur_addr_num >= num_preferred) {
3077                         cur_addr_num = 0;
3078                 }
3079                 sifa = sctp_select_nth_preferred_addr_from_ifn_boundall(sctp_ifn, inp, stcb, non_asoc_addr_ok, dest_is_loop,
3080                     dest_is_priv, cur_addr_num, fam, ro);
3081                 if (sifa == NULL)
3082                         continue;
3083                 if (net) {
3084                         net->indx_of_eligible_next_to_use = cur_addr_num + 1;
3085                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "we selected %d\n",
3086                             cur_addr_num);
3087                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Source:");
3088                         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, &sifa->address.sa);
3089                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Dest:");
3090                         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, &net->ro._l_addr.sa);
3091                 }
3092                 atomic_add_int(&sifa->refcount, 1);
3093                 return (sifa);
3094         }
3095 #ifdef INET
3096 again_with_private_addresses_allowed:
3097 #endif
3098         /* plan_c: do we have an acceptable address on the emit interface */
3099         sifa = NULL;
3100         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Trying Plan C: find acceptable on interface\n");
3101         if (emit_ifn == NULL) {
3102                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "Jump to Plan D - no emit_ifn\n");
3103                 goto plan_d;
3104         }
3105         LIST_FOREACH(sctp_ifa, &emit_ifn->ifalist, next_ifa) {
3106                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "ifa:%p\n", (void *)sctp_ifa);
3107 #ifdef INET
3108                 if ((sctp_ifa->address.sa.sa_family == AF_INET) &&
3109                     (prison_check_ip4(inp->ip_inp.inp.inp_cred,
3110                     &sctp_ifa->address.sin.sin_addr) != 0)) {
3111                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Jailed\n");
3112                         continue;
3113                 }
3114 #endif
3115 #ifdef INET6
3116                 if ((sctp_ifa->address.sa.sa_family == AF_INET6) &&
3117                     (prison_check_ip6(inp->ip_inp.inp.inp_cred,
3118                     &sctp_ifa->address.sin6.sin6_addr) != 0)) {
3119                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Jailed\n");
3120                         continue;
3121                 }
3122 #endif
3123                 if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
3124                     (non_asoc_addr_ok == 0)) {
3125                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Defer\n");
3126                         continue;
3127                 }
3128                 sifa = sctp_is_ifa_addr_acceptable(sctp_ifa, dest_is_loop,
3129                     dest_is_priv, fam);
3130                 if (sifa == NULL) {
3131                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "IFA not acceptable\n");
3132                         continue;
3133                 }
3134                 if (stcb) {
3135                         if (sctp_is_address_in_scope(sifa, &stcb->asoc.scope, 0) == 0) {
3136                                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "NOT in scope\n");
3137                                 sifa = NULL;
3138                                 continue;
3139                         }
3140                         if (((non_asoc_addr_ok == 0) &&
3141                             (sctp_is_addr_restricted(stcb, sifa))) ||
3142                             (non_asoc_addr_ok &&
3143                             (sctp_is_addr_restricted(stcb, sifa)) &&
3144                             (!sctp_is_addr_pending(stcb, sifa)))) {
3145                                 /*
3146                                  * It is restricted for some reason..
3147                                  * probably not yet added.
3148                                  */
3149                                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "Its restricted\n");
3150                                 sifa = NULL;
3151                                 continue;
3152                         }
3153                 }
3154                 atomic_add_int(&sifa->refcount, 1);
3155                 goto out;
3156         }
3157 plan_d:
3158         /*
3159          * plan_d: We are in trouble. No preferred address on the emit
3160          * interface. And not even a preferred address on all interfaces. Go
3161          * out and see if we can find an acceptable address somewhere
3162          * amongst all interfaces.
3163          */
3164         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Trying Plan D looked_at is %p\n", (void *)looked_at);
3165         LIST_FOREACH(sctp_ifn, &vrf->ifnlist, next_ifn) {
3166                 if (dest_is_loop == 0 && SCTP_IFN_IS_IFT_LOOP(sctp_ifn)) {
3167                         /* wrong base scope */
3168                         continue;
3169                 }
3170                 LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
3171 #ifdef INET
3172                         if ((sctp_ifa->address.sa.sa_family == AF_INET) &&
3173                             (prison_check_ip4(inp->ip_inp.inp.inp_cred,
3174                             &sctp_ifa->address.sin.sin_addr) != 0)) {
3175                                 continue;
3176                         }
3177 #endif
3178 #ifdef INET6
3179                         if ((sctp_ifa->address.sa.sa_family == AF_INET6) &&
3180                             (prison_check_ip6(inp->ip_inp.inp.inp_cred,
3181                             &sctp_ifa->address.sin6.sin6_addr) != 0)) {
3182                                 continue;
3183                         }
3184 #endif
3185                         if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
3186                             (non_asoc_addr_ok == 0))
3187                                 continue;
3188                         sifa = sctp_is_ifa_addr_acceptable(sctp_ifa,
3189                             dest_is_loop,
3190                             dest_is_priv, fam);
3191                         if (sifa == NULL)
3192                                 continue;
3193                         if (stcb) {
3194                                 if (sctp_is_address_in_scope(sifa, &stcb->asoc.scope, 0) == 0) {
3195                                         sifa = NULL;
3196                                         continue;
3197                                 }
3198                                 if (((non_asoc_addr_ok == 0) &&
3199                                     (sctp_is_addr_restricted(stcb, sifa))) ||
3200                                     (non_asoc_addr_ok &&
3201                                     (sctp_is_addr_restricted(stcb, sifa)) &&
3202                                     (!sctp_is_addr_pending(stcb, sifa)))) {
3203                                         /*
3204                                          * It is restricted for some
3205                                          * reason.. probably not yet added.
3206                                          */
3207                                         sifa = NULL;
3208                                         continue;
3209                                 }
3210                         }
3211                         goto out;
3212                 }
3213         }
3214 #ifdef INET
3215         if (stcb) {
3216                 if ((retried == 0) && (stcb->asoc.scope.ipv4_local_scope == 0)) {
3217                         stcb->asoc.scope.ipv4_local_scope = 1;
3218                         retried = 1;
3219                         goto again_with_private_addresses_allowed;
3220                 } else if (retried == 1) {
3221                         stcb->asoc.scope.ipv4_local_scope = 0;
3222                 }
3223         }
3224 #endif
3225 out:
3226 #ifdef INET
3227         if (sifa) {
3228                 if (retried == 1) {
3229                         LIST_FOREACH(sctp_ifn, &vrf->ifnlist, next_ifn) {
3230                                 if (dest_is_loop == 0 && SCTP_IFN_IS_IFT_LOOP(sctp_ifn)) {
3231                                         /* wrong base scope */
3232                                         continue;
3233                                 }
3234                                 LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
3235                                         struct sctp_ifa *tmp_sifa;
3236
3237 #ifdef INET
3238                                         if ((sctp_ifa->address.sa.sa_family == AF_INET) &&
3239                                             (prison_check_ip4(inp->ip_inp.inp.inp_cred,
3240                                             &sctp_ifa->address.sin.sin_addr) != 0)) {
3241                                                 continue;
3242                                         }
3243 #endif
3244 #ifdef INET6
3245                                         if ((sctp_ifa->address.sa.sa_family == AF_INET6) &&
3246                                             (prison_check_ip6(inp->ip_inp.inp.inp_cred,
3247                                             &sctp_ifa->address.sin6.sin6_addr) != 0)) {
3248                                                 continue;
3249                                         }
3250 #endif
3251                                         if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
3252                                             (non_asoc_addr_ok == 0))
3253                                                 continue;
3254                                         tmp_sifa = sctp_is_ifa_addr_acceptable(sctp_ifa,
3255                                             dest_is_loop,
3256                                             dest_is_priv, fam);
3257                                         if (tmp_sifa == NULL) {
3258                                                 continue;
3259                                         }
3260                                         if (tmp_sifa == sifa) {
3261                                                 continue;
3262                                         }
3263                                         if (stcb) {
3264                                                 if (sctp_is_address_in_scope(tmp_sifa,
3265                                                     &stcb->asoc.scope, 0) == 0) {
3266                                                         continue;
3267                                                 }
3268                                                 if (((non_asoc_addr_ok == 0) &&
3269                                                     (sctp_is_addr_restricted(stcb, tmp_sifa))) ||
3270                                                     (non_asoc_addr_ok &&
3271                                                     (sctp_is_addr_restricted(stcb, tmp_sifa)) &&
3272                                                     (!sctp_is_addr_pending(stcb, tmp_sifa)))) {
3273                                                         /*
3274                                                          * It is restricted
3275                                                          * for some reason..
3276                                                          * probably not yet
3277                                                          * added.
3278                                                          */
3279                                                         continue;
3280                                                 }
3281                                         }
3282                                         if ((tmp_sifa->address.sin.sin_family == AF_INET) &&
3283                                             (IN4_ISPRIVATE_ADDRESS(&(tmp_sifa->address.sin.sin_addr)))) {
3284                                                 sctp_add_local_addr_restricted(stcb, tmp_sifa);
3285                                         }
3286                                 }
3287                         }
3288                 }
3289                 atomic_add_int(&sifa->refcount, 1);
3290         }
3291 #endif
3292         return (sifa);
3293 }
3294
3295 /* tcb may be NULL */
3296 struct sctp_ifa *
3297 sctp_source_address_selection(struct sctp_inpcb *inp,
3298     struct sctp_tcb *stcb,
3299     sctp_route_t *ro,
3300     struct sctp_nets *net,
3301     int non_asoc_addr_ok, uint32_t vrf_id)
3302 {
3303         struct sctp_ifa *answer;
3304         uint8_t dest_is_priv, dest_is_loop;
3305         sa_family_t fam;
3306 #ifdef INET
3307         struct sockaddr_in *to = (struct sockaddr_in *)&ro->ro_dst;
3308 #endif
3309 #ifdef INET6
3310         struct sockaddr_in6 *to6 = (struct sockaddr_in6 *)&ro->ro_dst;
3311 #endif
3312
3313         /**
3314          * Rules:
3315          * - Find the route if needed, cache if I can.
3316          * - Look at interface address in route, Is it in the bound list. If so we
3317          *   have the best source.
3318          * - If not we must rotate amongst the addresses.
3319          *
3320          * Cavets and issues
3321          *
3322          * Do we need to pay attention to scope. We can have a private address
3323          * or a global address we are sourcing or sending to. So if we draw
3324          * it out
3325          * zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz
3326          * For V4
3327          * ------------------------------------------
3328          *      source     *      dest  *  result
3329          * -----------------------------------------
3330          * <a>  Private    *    Global  *  NAT
3331          * -----------------------------------------
3332          * <b>  Private    *    Private *  No problem
3333          * -----------------------------------------
3334          * <c>  Global     *    Private *  Huh, How will this work?
3335          * -----------------------------------------
3336          * <d>  Global     *    Global  *  No Problem
3337          *------------------------------------------
3338          * zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz
3339          * For V6
3340          *------------------------------------------
3341          *      source     *      dest  *  result
3342          * -----------------------------------------
3343          * <a>  Linklocal  *    Global  *
3344          * -----------------------------------------
3345          * <b>  Linklocal  * Linklocal  *  No problem
3346          * -----------------------------------------
3347          * <c>  Global     * Linklocal  *  Huh, How will this work?
3348          * -----------------------------------------
3349          * <d>  Global     *    Global  *  No Problem
3350          *------------------------------------------
3351          * zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz
3352          *
3353          * And then we add to that what happens if there are multiple addresses
3354          * assigned to an interface. Remember the ifa on a ifn is a linked
3355          * list of addresses. So one interface can have more than one IP
3356          * address. What happens if we have both a private and a global
3357          * address? Do we then use context of destination to sort out which
3358          * one is best? And what about NAT's sending P->G may get you a NAT
3359          * translation, or should you select the G thats on the interface in
3360          * preference.
3361          *
3362          * Decisions:
3363          *
3364          * - count the number of addresses on the interface.
3365          * - if it is one, no problem except case <c>.
3366          *   For <a> we will assume a NAT out there.
3367          * - if there are more than one, then we need to worry about scope P
3368          *   or G. We should prefer G -> G and P -> P if possible.
3369          *   Then as a secondary fall back to mixed types G->P being a last
3370          *   ditch one.
3371          * - The above all works for bound all, but bound specific we need to
3372          *   use the same concept but instead only consider the bound
3373          *   addresses. If the bound set is NOT assigned to the interface then
3374          *   we must use rotation amongst the bound addresses..
3375          */
3376         if (ro->ro_nh == NULL) {
3377                 /*
3378                  * Need a route to cache.
3379                  */
3380                 SCTP_RTALLOC(ro, vrf_id, inp->fibnum);
3381         }
3382         if (ro->ro_nh == NULL) {
3383                 return (NULL);
3384         }
3385         fam = ro->ro_dst.sa_family;
3386         dest_is_priv = dest_is_loop = 0;
3387         /* Setup our scopes for the destination */
3388         switch (fam) {
3389 #ifdef INET
3390         case AF_INET:
3391                 /* Scope based on outbound address */
3392                 if (IN4_ISLOOPBACK_ADDRESS(&to->sin_addr)) {
3393                         dest_is_loop = 1;
3394                         if (net != NULL) {
3395                                 /* mark it as local */
3396                                 net->addr_is_local = 1;
3397                         }
3398                 } else if ((IN4_ISPRIVATE_ADDRESS(&to->sin_addr))) {
3399                         dest_is_priv = 1;
3400                 }
3401                 break;
3402 #endif
3403 #ifdef INET6
3404         case AF_INET6:
3405                 /* Scope based on outbound address */
3406                 if (IN6_IS_ADDR_LOOPBACK(&to6->sin6_addr) ||
3407                     SCTP_ROUTE_IS_REAL_LOOP(ro)) {
3408                         /*
3409                          * If the address is a loopback address, which
3410                          * consists of "::1" OR "fe80::1%lo0", we are
3411                          * loopback scope. But we don't use dest_is_priv
3412                          * (link local addresses).
3413                          */
3414                         dest_is_loop = 1;
3415                         if (net != NULL) {
3416                                 /* mark it as local */
3417                                 net->addr_is_local = 1;
3418                         }
3419                 } else if (IN6_IS_ADDR_LINKLOCAL(&to6->sin6_addr)) {
3420                         dest_is_priv = 1;
3421                 }
3422                 break;
3423 #endif
3424         }
3425         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Select source addr for:");
3426         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)&ro->ro_dst);
3427         SCTP_IPI_ADDR_RLOCK();
3428         if (inp->sctp_flags & SCTP_PCB_FLAGS_BOUNDALL) {
3429                 /*
3430                  * Bound all case
3431                  */
3432                 answer = sctp_choose_boundall(inp, stcb, net, ro, vrf_id,
3433                     dest_is_priv, dest_is_loop,
3434                     non_asoc_addr_ok, fam);
3435                 SCTP_IPI_ADDR_RUNLOCK();
3436                 return (answer);
3437         }
3438         /*
3439          * Subset bound case
3440          */
3441         if (stcb) {
3442                 answer = sctp_choose_boundspecific_stcb(inp, stcb, ro,
3443                     vrf_id, dest_is_priv,
3444                     dest_is_loop,
3445                     non_asoc_addr_ok, fam);
3446         } else {
3447                 answer = sctp_choose_boundspecific_inp(inp, ro, vrf_id,
3448                     non_asoc_addr_ok,
3449                     dest_is_priv,
3450                     dest_is_loop, fam);
3451         }
3452         SCTP_IPI_ADDR_RUNLOCK();
3453         return (answer);
3454 }
3455
3456 static int
3457 sctp_find_cmsg(int c_type, void *data, struct mbuf *control, size_t cpsize)
3458 {
3459         struct cmsghdr cmh;
3460         struct sctp_sndinfo sndinfo;
3461         struct sctp_prinfo prinfo;
3462         struct sctp_authinfo authinfo;
3463         int tot_len, rem_len, cmsg_data_len, cmsg_data_off, off;
3464         int found;
3465
3466         /*
3467          * Independent of how many mbufs, find the c_type inside the control
3468          * structure and copy out the data.
3469          */
3470         found = 0;
3471         tot_len = SCTP_BUF_LEN(control);
3472         for (off = 0; off < tot_len; off += CMSG_ALIGN(cmh.cmsg_len)) {
3473                 rem_len = tot_len - off;
3474                 if (rem_len < (int)CMSG_ALIGN(sizeof(cmh))) {
3475                         /* There is not enough room for one more. */
3476                         return (found);
3477                 }
3478                 m_copydata(control, off, sizeof(cmh), (caddr_t)&cmh);
3479                 if (cmh.cmsg_len < CMSG_ALIGN(sizeof(cmh))) {
3480                         /* We dont't have a complete CMSG header. */
3481                         return (found);
3482                 }
3483                 if ((cmh.cmsg_len > INT_MAX) || ((int)cmh.cmsg_len > rem_len)) {
3484                         /* We don't have the complete CMSG. */
3485                         return (found);
3486                 }
3487                 cmsg_data_len = (int)cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh));
3488                 cmsg_data_off = off + CMSG_ALIGN(sizeof(cmh));
3489                 if ((cmh.cmsg_level == IPPROTO_SCTP) &&
3490                     ((c_type == cmh.cmsg_type) ||
3491                     ((c_type == SCTP_SNDRCV) &&
3492                     ((cmh.cmsg_type == SCTP_SNDINFO) ||
3493                     (cmh.cmsg_type == SCTP_PRINFO) ||
3494                     (cmh.cmsg_type == SCTP_AUTHINFO))))) {
3495                         if (c_type == cmh.cmsg_type) {
3496                                 if (cpsize > INT_MAX) {
3497                                         return (found);
3498                                 }
3499                                 if (cmsg_data_len < (int)cpsize) {
3500                                         return (found);
3501                                 }
3502                                 /* It is exactly what we want. Copy it out. */
3503                                 m_copydata(control, cmsg_data_off, (int)cpsize, (caddr_t)data);
3504                                 return (1);
3505                         } else {
3506                                 struct sctp_sndrcvinfo *sndrcvinfo;
3507
3508                                 sndrcvinfo = (struct sctp_sndrcvinfo *)data;
3509                                 if (found == 0) {
3510                                         if (cpsize < sizeof(struct sctp_sndrcvinfo)) {
3511                                                 return (found);
3512                                         }
3513                                         memset(sndrcvinfo, 0, sizeof(struct sctp_sndrcvinfo));
3514                                 }
3515                                 switch (cmh.cmsg_type) {
3516                                 case SCTP_SNDINFO:
3517                                         if (cmsg_data_len < (int)sizeof(struct sctp_sndinfo)) {
3518                                                 return (found);
3519                                         }
3520                                         m_copydata(control, cmsg_data_off, sizeof(struct sctp_sndinfo), (caddr_t)&sndinfo);
3521                                         sndrcvinfo->sinfo_stream = sndinfo.snd_sid;
3522                                         sndrcvinfo->sinfo_flags = sndinfo.snd_flags;
3523                                         sndrcvinfo->sinfo_ppid = sndinfo.snd_ppid;
3524                                         sndrcvinfo->sinfo_context = sndinfo.snd_context;
3525                                         sndrcvinfo->sinfo_assoc_id = sndinfo.snd_assoc_id;
3526                                         break;
3527                                 case SCTP_PRINFO:
3528                                         if (cmsg_data_len < (int)sizeof(struct sctp_prinfo)) {
3529                                                 return (found);
3530                                         }
3531                                         m_copydata(control, cmsg_data_off, sizeof(struct sctp_prinfo), (caddr_t)&prinfo);
3532                                         if (prinfo.pr_policy != SCTP_PR_SCTP_NONE) {
3533                                                 sndrcvinfo->sinfo_timetolive = prinfo.pr_value;
3534                                         } else {
3535                                                 sndrcvinfo->sinfo_timetolive = 0;
3536                                         }
3537                                         sndrcvinfo->sinfo_flags |= prinfo.pr_policy;
3538                                         break;
3539                                 case SCTP_AUTHINFO:
3540                                         if (cmsg_data_len < (int)sizeof(struct sctp_authinfo)) {
3541                                                 return (found);
3542                                         }
3543                                         m_copydata(control, cmsg_data_off, sizeof(struct sctp_authinfo), (caddr_t)&authinfo);
3544                                         sndrcvinfo->sinfo_keynumber_valid = 1;
3545                                         sndrcvinfo->sinfo_keynumber = authinfo.auth_keynumber;
3546                                         break;
3547                                 default:
3548                                         return (found);
3549                                 }
3550                                 found = 1;
3551                         }
3552                 }
3553         }
3554         return (found);
3555 }
3556
3557 static int
3558 sctp_process_cmsgs_for_init(struct sctp_tcb *stcb, struct mbuf *control, int *error)
3559 {
3560         struct cmsghdr cmh;
3561         struct sctp_initmsg initmsg;
3562 #ifdef INET
3563         struct sockaddr_in sin;
3564 #endif
3565 #ifdef INET6
3566         struct sockaddr_in6 sin6;
3567 #endif
3568         int tot_len, rem_len, cmsg_data_len, cmsg_data_off, off;
3569
3570         tot_len = SCTP_BUF_LEN(control);
3571         for (off = 0; off < tot_len; off += CMSG_ALIGN(cmh.cmsg_len)) {
3572                 rem_len = tot_len - off;
3573                 if (rem_len < (int)CMSG_ALIGN(sizeof(cmh))) {
3574                         /* There is not enough room for one more. */
3575                         *error = EINVAL;
3576                         return (1);
3577                 }
3578                 m_copydata(control, off, sizeof(cmh), (caddr_t)&cmh);
3579                 if (cmh.cmsg_len < CMSG_ALIGN(sizeof(cmh))) {
3580                         /* We dont't have a complete CMSG header. */
3581                         *error = EINVAL;
3582                         return (1);
3583                 }
3584                 if ((cmh.cmsg_len > INT_MAX) || ((int)cmh.cmsg_len > rem_len)) {
3585                         /* We don't have the complete CMSG. */
3586                         *error = EINVAL;
3587                         return (1);
3588                 }
3589                 cmsg_data_len = (int)cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh));
3590                 cmsg_data_off = off + CMSG_ALIGN(sizeof(cmh));
3591                 if (cmh.cmsg_level == IPPROTO_SCTP) {
3592                         switch (cmh.cmsg_type) {
3593                         case SCTP_INIT:
3594                                 if (cmsg_data_len < (int)sizeof(struct sctp_initmsg)) {
3595                                         *error = EINVAL;
3596                                         return (1);
3597                                 }
3598                                 m_copydata(control, cmsg_data_off, sizeof(struct sctp_initmsg), (caddr_t)&initmsg);
3599                                 if (initmsg.sinit_max_attempts)
3600                                         stcb->asoc.max_init_times = initmsg.sinit_max_attempts;
3601                                 if (initmsg.sinit_num_ostreams)
3602                                         stcb->asoc.pre_open_streams = initmsg.sinit_num_ostreams;
3603                                 if (initmsg.sinit_max_instreams)
3604                                         stcb->asoc.max_inbound_streams = initmsg.sinit_max_instreams;
3605                                 if (initmsg.sinit_max_init_timeo)
3606                                         stcb->asoc.initial_init_rto_max = initmsg.sinit_max_init_timeo;
3607                                 if (stcb->asoc.streamoutcnt < stcb->asoc.pre_open_streams) {
3608                                         struct sctp_stream_out *tmp_str;
3609                                         unsigned int i;
3610 #if defined(SCTP_DETAILED_STR_STATS)
3611                                         int j;
3612 #endif
3613
3614                                         /* Default is NOT correct */
3615                                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Ok, default:%d pre_open:%d\n",
3616                                             stcb->asoc.streamoutcnt, stcb->asoc.pre_open_streams);
3617                                         SCTP_TCB_UNLOCK(stcb);
3618                                         SCTP_MALLOC(tmp_str,
3619                                             struct sctp_stream_out *,
3620                                             (stcb->asoc.pre_open_streams * sizeof(struct sctp_stream_out)),
3621                                             SCTP_M_STRMO);
3622                                         SCTP_TCB_LOCK(stcb);
3623                                         if (tmp_str != NULL) {
3624                                                 SCTP_FREE(stcb->asoc.strmout, SCTP_M_STRMO);
3625                                                 stcb->asoc.strmout = tmp_str;
3626                                                 stcb->asoc.strm_realoutsize = stcb->asoc.streamoutcnt = stcb->asoc.pre_open_streams;
3627                                         } else {
3628                                                 stcb->asoc.pre_open_streams = stcb->asoc.streamoutcnt;
3629                                         }
3630                                         for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
3631                                                 TAILQ_INIT(&stcb->asoc.strmout[i].outqueue);
3632                                                 stcb->asoc.ss_functions.sctp_ss_init_stream(stcb, &stcb->asoc.strmout[i], NULL);
3633                                                 stcb->asoc.strmout[i].chunks_on_queues = 0;
3634 #if defined(SCTP_DETAILED_STR_STATS)
3635                                                 for (j = 0; j < SCTP_PR_SCTP_MAX + 1; j++) {
3636                                                         stcb->asoc.strmout[i].abandoned_sent[j] = 0;
3637                                                         stcb->asoc.strmout[i].abandoned_unsent[j] = 0;
3638                                                 }
3639 #else
3640                                                 stcb->asoc.strmout[i].abandoned_sent[0] = 0;
3641                                                 stcb->asoc.strmout[i].abandoned_unsent[0] = 0;
3642 #endif
3643                                                 stcb->asoc.strmout[i].next_mid_ordered = 0;
3644                                                 stcb->asoc.strmout[i].next_mid_unordered = 0;
3645                                                 stcb->asoc.strmout[i].sid = i;
3646                                                 stcb->asoc.strmout[i].last_msg_incomplete = 0;
3647                                                 stcb->asoc.strmout[i].state = SCTP_STREAM_OPENING;
3648                                         }
3649                                 }
3650                                 break;
3651 #ifdef INET
3652                         case SCTP_DSTADDRV4:
3653                                 if (cmsg_data_len < (int)sizeof(struct in_addr)) {
3654                                         *error = EINVAL;
3655                                         return (1);
3656                                 }
3657                                 memset(&sin, 0, sizeof(struct sockaddr_in));
3658                                 sin.sin_family = AF_INET;
3659                                 sin.sin_len = sizeof(struct sockaddr_in);
3660                                 sin.sin_port = stcb->rport;
3661                                 m_copydata(control, cmsg_data_off, sizeof(struct in_addr), (caddr_t)&sin.sin_addr);
3662                                 if ((sin.sin_addr.s_addr == INADDR_ANY) ||
3663                                     (sin.sin_addr.s_addr == INADDR_BROADCAST) ||
3664                                     IN_MULTICAST(ntohl(sin.sin_addr.s_addr))) {
3665                                         *error = EINVAL;
3666                                         return (1);
3667                                 }
3668                                 if (sctp_add_remote_addr(stcb, (struct sockaddr *)&sin, NULL, stcb->asoc.port,
3669                                     SCTP_DONOT_SETSCOPE, SCTP_ADDR_IS_CONFIRMED)) {
3670                                         *error = ENOBUFS;
3671                                         return (1);
3672                                 }
3673                                 break;
3674 #endif
3675 #ifdef INET6
3676                         case SCTP_DSTADDRV6:
3677                                 if (cmsg_data_len < (int)sizeof(struct in6_addr)) {
3678                                         *error = EINVAL;
3679                                         return (1);
3680                                 }
3681                                 memset(&sin6, 0, sizeof(struct sockaddr_in6));
3682                                 sin6.sin6_family = AF_INET6;
3683                                 sin6.sin6_len = sizeof(struct sockaddr_in6);
3684                                 sin6.sin6_port = stcb->rport;
3685                                 m_copydata(control, cmsg_data_off, sizeof(struct in6_addr), (caddr_t)&sin6.sin6_addr);
3686                                 if (IN6_IS_ADDR_UNSPECIFIED(&sin6.sin6_addr) ||
3687                                     IN6_IS_ADDR_MULTICAST(&sin6.sin6_addr)) {
3688                                         *error = EINVAL;
3689                                         return (1);
3690                                 }
3691 #ifdef INET
3692                                 if (IN6_IS_ADDR_V4MAPPED(&sin6.sin6_addr)) {
3693                                         in6_sin6_2_sin(&sin, &sin6);
3694                                         if ((sin.sin_addr.s_addr == INADDR_ANY) ||
3695                                             (sin.sin_addr.s_addr == INADDR_BROADCAST) ||
3696                                             IN_MULTICAST(ntohl(sin.sin_addr.s_addr))) {
3697                                                 *error = EINVAL;
3698                                                 return (1);
3699                                         }
3700                                         if (sctp_add_remote_addr(stcb, (struct sockaddr *)&sin, NULL, stcb->asoc.port,
3701                                             SCTP_DONOT_SETSCOPE, SCTP_ADDR_IS_CONFIRMED)) {
3702                                                 *error = ENOBUFS;
3703                                                 return (1);
3704                                         }
3705                                 } else
3706 #endif
3707                                         if (sctp_add_remote_addr(stcb, (struct sockaddr *)&sin6, NULL, stcb->asoc.port,
3708                                     SCTP_DONOT_SETSCOPE, SCTP_ADDR_IS_CONFIRMED)) {
3709                                         *error = ENOBUFS;
3710                                         return (1);
3711                                 }
3712                                 break;
3713 #endif
3714                         default:
3715                                 break;
3716                         }
3717                 }
3718         }
3719         return (0);
3720 }
3721
3722 #if defined(INET) || defined(INET6)
3723 static struct sctp_tcb *
3724 sctp_findassociation_cmsgs(struct sctp_inpcb **inp_p,
3725     uint16_t port,
3726     struct mbuf *control,
3727     struct sctp_nets **net_p,
3728     int *error)
3729 {
3730         struct cmsghdr cmh;
3731         struct sctp_tcb *stcb;
3732         struct sockaddr *addr;
3733 #ifdef INET
3734         struct sockaddr_in sin;
3735 #endif
3736 #ifdef INET6
3737         struct sockaddr_in6 sin6;
3738 #endif
3739         int tot_len, rem_len, cmsg_data_len, cmsg_data_off, off;
3740
3741         tot_len = SCTP_BUF_LEN(control);
3742         for (off = 0; off < tot_len; off += CMSG_ALIGN(cmh.cmsg_len)) {
3743                 rem_len = tot_len - off;
3744                 if (rem_len < (int)CMSG_ALIGN(sizeof(cmh))) {
3745                         /* There is not enough room for one more. */
3746                         *error = EINVAL;
3747                         return (NULL);
3748                 }
3749                 m_copydata(control, off, sizeof(cmh), (caddr_t)&cmh);
3750                 if (cmh.cmsg_len < CMSG_ALIGN(sizeof(cmh))) {
3751                         /* We dont't have a complete CMSG header. */
3752                         *error = EINVAL;
3753                         return (NULL);
3754                 }
3755                 if ((cmh.cmsg_len > INT_MAX) || ((int)cmh.cmsg_len > rem_len)) {
3756                         /* We don't have the complete CMSG. */
3757                         *error = EINVAL;
3758                         return (NULL);
3759                 }
3760                 cmsg_data_len = (int)cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh));
3761                 cmsg_data_off = off + CMSG_ALIGN(sizeof(cmh));
3762                 if (cmh.cmsg_level == IPPROTO_SCTP) {
3763                         switch (cmh.cmsg_type) {
3764 #ifdef INET
3765                         case SCTP_DSTADDRV4:
3766                                 if (cmsg_data_len < (int)sizeof(struct in_addr)) {
3767                                         *error = EINVAL;
3768                                         return (NULL);
3769                                 }
3770                                 memset(&sin, 0, sizeof(struct sockaddr_in));
3771                                 sin.sin_family = AF_INET;
3772                                 sin.sin_len = sizeof(struct sockaddr_in);
3773                                 sin.sin_port = port;
3774                                 m_copydata(control, cmsg_data_off, sizeof(struct in_addr), (caddr_t)&sin.sin_addr);
3775                                 addr = (struct sockaddr *)&sin;
3776                                 break;
3777 #endif
3778 #ifdef INET6
3779                         case SCTP_DSTADDRV6:
3780                                 if (cmsg_data_len < (int)sizeof(struct in6_addr)) {
3781                                         *error = EINVAL;
3782                                         return (NULL);
3783                                 }
3784                                 memset(&sin6, 0, sizeof(struct sockaddr_in6));
3785                                 sin6.sin6_family = AF_INET6;
3786                                 sin6.sin6_len = sizeof(struct sockaddr_in6);
3787                                 sin6.sin6_port = port;
3788                                 m_copydata(control, cmsg_data_off, sizeof(struct in6_addr), (caddr_t)&sin6.sin6_addr);
3789 #ifdef INET
3790                                 if (IN6_IS_ADDR_V4MAPPED(&sin6.sin6_addr)) {
3791                                         in6_sin6_2_sin(&sin, &sin6);
3792                                         addr = (struct sockaddr *)&sin;
3793                                 } else
3794 #endif
3795                                         addr = (struct sockaddr *)&sin6;
3796                                 break;
3797 #endif
3798                         default:
3799                                 addr = NULL;
3800                                 break;
3801                         }
3802                         if (addr) {
3803                                 stcb = sctp_findassociation_ep_addr(inp_p, addr, net_p, NULL, NULL);
3804                                 if (stcb != NULL) {
3805                                         return (stcb);
3806                                 }
3807                         }
3808                 }
3809         }
3810         return (NULL);
3811 }
3812 #endif
3813
3814 static struct mbuf *
3815 sctp_add_cookie(struct mbuf *init, int init_offset,
3816     struct mbuf *initack, int initack_offset, struct sctp_state_cookie *stc_in, uint8_t **signature)
3817 {
3818         struct mbuf *copy_init, *copy_initack, *m_at, *sig, *mret;
3819         struct sctp_state_cookie *stc;
3820         struct sctp_paramhdr *ph;
3821         uint16_t cookie_sz;
3822
3823         mret = sctp_get_mbuf_for_msg((sizeof(struct sctp_state_cookie) +
3824             sizeof(struct sctp_paramhdr)), 0,
3825             M_NOWAIT, 1, MT_DATA);
3826         if (mret == NULL) {
3827                 return (NULL);
3828         }
3829         copy_init = SCTP_M_COPYM(init, init_offset, M_COPYALL, M_NOWAIT);
3830         if (copy_init == NULL) {
3831                 sctp_m_freem(mret);
3832                 return (NULL);
3833         }
3834 #ifdef SCTP_MBUF_LOGGING
3835         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
3836                 sctp_log_mbc(copy_init, SCTP_MBUF_ICOPY);
3837         }
3838 #endif
3839         copy_initack = SCTP_M_COPYM(initack, initack_offset, M_COPYALL,
3840             M_NOWAIT);
3841         if (copy_initack == NULL) {
3842                 sctp_m_freem(mret);
3843                 sctp_m_freem(copy_init);
3844                 return (NULL);
3845         }
3846 #ifdef SCTP_MBUF_LOGGING
3847         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
3848                 sctp_log_mbc(copy_initack, SCTP_MBUF_ICOPY);
3849         }
3850 #endif
3851         /* easy side we just drop it on the end */
3852         ph = mtod(mret, struct sctp_paramhdr *);
3853         SCTP_BUF_LEN(mret) = sizeof(struct sctp_state_cookie) +
3854             sizeof(struct sctp_paramhdr);
3855         stc = (struct sctp_state_cookie *)((caddr_t)ph +
3856             sizeof(struct sctp_paramhdr));
3857         ph->param_type = htons(SCTP_STATE_COOKIE);
3858         ph->param_length = 0;   /* fill in at the end */
3859         /* Fill in the stc cookie data */
3860         memcpy(stc, stc_in, sizeof(struct sctp_state_cookie));
3861
3862         /* tack the INIT and then the INIT-ACK onto the chain */
3863         cookie_sz = 0;
3864         for (m_at = mret; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
3865                 cookie_sz += SCTP_BUF_LEN(m_at);
3866                 if (SCTP_BUF_NEXT(m_at) == NULL) {
3867                         SCTP_BUF_NEXT(m_at) = copy_init;
3868                         break;
3869                 }
3870         }
3871         for (m_at = copy_init; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
3872                 cookie_sz += SCTP_BUF_LEN(m_at);
3873                 if (SCTP_BUF_NEXT(m_at) == NULL) {
3874                         SCTP_BUF_NEXT(m_at) = copy_initack;
3875                         break;
3876                 }
3877         }
3878         for (m_at = copy_initack; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
3879                 cookie_sz += SCTP_BUF_LEN(m_at);
3880                 if (SCTP_BUF_NEXT(m_at) == NULL) {
3881                         break;
3882                 }
3883         }
3884         sig = sctp_get_mbuf_for_msg(SCTP_SIGNATURE_SIZE, 0, M_NOWAIT, 1, MT_DATA);
3885         if (sig == NULL) {
3886                 /* no space, so free the entire chain */
3887                 sctp_m_freem(mret);
3888                 return (NULL);
3889         }
3890         SCTP_BUF_NEXT(m_at) = sig;
3891         SCTP_BUF_LEN(sig) = SCTP_SIGNATURE_SIZE;
3892         cookie_sz += SCTP_SIGNATURE_SIZE;
3893         ph->param_length = htons(cookie_sz);
3894         *signature = (uint8_t *)mtod(sig, caddr_t);
3895         memset(*signature, 0, SCTP_SIGNATURE_SIZE);
3896         return (mret);
3897 }
3898
3899 static uint8_t
3900 sctp_get_ect(struct sctp_tcb *stcb)
3901 {
3902         if ((stcb != NULL) && (stcb->asoc.ecn_supported == 1)) {
3903                 return (SCTP_ECT0_BIT);
3904         } else {
3905                 return (0);
3906         }
3907 }
3908
3909 #if defined(INET) || defined(INET6)
3910 static void
3911 sctp_handle_no_route(struct sctp_tcb *stcb,
3912     struct sctp_nets *net,
3913     int so_locked)
3914 {
3915         SCTPDBG(SCTP_DEBUG_OUTPUT1, "dropped packet - no valid source addr\n");
3916
3917         if (net) {
3918                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Destination was ");
3919                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT1, &net->ro._l_addr.sa);
3920                 if (net->dest_state & SCTP_ADDR_CONFIRMED) {
3921                         if ((net->dest_state & SCTP_ADDR_REACHABLE) && stcb) {
3922                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "no route takes interface %p down\n", (void *)net);
3923                                 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_DOWN,
3924                                     stcb, 0,
3925                                     (void *)net,
3926                                     so_locked);
3927                                 net->dest_state &= ~SCTP_ADDR_REACHABLE;
3928                                 net->dest_state &= ~SCTP_ADDR_PF;
3929                         }
3930                 }
3931                 if (stcb) {
3932                         if (net == stcb->asoc.primary_destination) {
3933                                 /* need a new primary */
3934                                 struct sctp_nets *alt;
3935
3936                                 alt = sctp_find_alternate_net(stcb, net, 0);
3937                                 if (alt != net) {
3938                                         if (stcb->asoc.alternate) {
3939                                                 sctp_free_remote_addr(stcb->asoc.alternate);
3940                                         }
3941                                         stcb->asoc.alternate = alt;
3942                                         atomic_add_int(&stcb->asoc.alternate->ref_count, 1);
3943                                         if (net->ro._s_addr) {
3944                                                 sctp_free_ifa(net->ro._s_addr);
3945                                                 net->ro._s_addr = NULL;
3946                                         }
3947                                         net->src_addr_selected = 0;
3948                                 }
3949                         }
3950                 }
3951         }
3952 }
3953 #endif
3954
3955 static int
3956 sctp_lowlevel_chunk_output(struct sctp_inpcb *inp,
3957     struct sctp_tcb *stcb,      /* may be NULL */
3958     struct sctp_nets *net,
3959     struct sockaddr *to,
3960     struct mbuf *m,
3961     uint32_t auth_offset,
3962     struct sctp_auth_chunk *auth,
3963     uint16_t auth_keyid,
3964     int nofragment_flag,
3965     int ecn_ok,
3966     int out_of_asoc_ok,
3967     uint16_t src_port,
3968     uint16_t dest_port,
3969     uint32_t v_tag,
3970     uint16_t port,
3971     union sctp_sockstore *over_addr,
3972     uint8_t mflowtype, uint32_t mflowid,
3973     int so_locked)
3974 {
3975 /* nofragment_flag to tell if IP_DF should be set (IPv4 only) */
3976         /**
3977          * Given a mbuf chain (via SCTP_BUF_NEXT()) that holds a packet header
3978          * WITH an SCTPHDR but no IP header, endpoint inp and sa structure:
3979          * - fill in the HMAC digest of any AUTH chunk in the packet.
3980          * - calculate and fill in the SCTP checksum.
3981          * - prepend an IP address header.
3982          * - if boundall use INADDR_ANY.
3983          * - if boundspecific do source address selection.
3984          * - set fragmentation option for ipV4.
3985          * - On return from IP output, check/adjust mtu size of output
3986          *   interface and smallest_mtu size as well.
3987          */
3988         /* Will need ifdefs around this */
3989         struct mbuf *newm;
3990         struct sctphdr *sctphdr;
3991         int packet_length;
3992         int ret;
3993 #if defined(INET) || defined(INET6)
3994         uint32_t vrf_id;
3995 #endif
3996 #if defined(INET) || defined(INET6)
3997         struct mbuf *o_pak;
3998         sctp_route_t *ro = NULL;
3999         struct udphdr *udp = NULL;
4000 #endif
4001         uint8_t tos_value;
4002
4003         if ((net) && (net->dest_state & SCTP_ADDR_OUT_OF_SCOPE)) {
4004                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EFAULT);
4005                 sctp_m_freem(m);
4006                 return (EFAULT);
4007         }
4008 #if defined(INET) || defined(INET6)
4009         if (stcb) {
4010                 vrf_id = stcb->asoc.vrf_id;
4011         } else {
4012                 vrf_id = inp->def_vrf_id;
4013         }
4014 #endif
4015         /* fill in the HMAC digest for any AUTH chunk in the packet */
4016         if ((auth != NULL) && (stcb != NULL)) {
4017                 sctp_fill_hmac_digest_m(m, auth_offset, auth, stcb, auth_keyid);
4018         }
4019
4020         if (net) {
4021                 tos_value = net->dscp;
4022         } else if (stcb) {
4023                 tos_value = stcb->asoc.default_dscp;
4024         } else {
4025                 tos_value = inp->sctp_ep.default_dscp;
4026         }
4027
4028         switch (to->sa_family) {
4029 #ifdef INET
4030         case AF_INET:
4031                 {
4032                         struct ip *ip = NULL;
4033                         sctp_route_t iproute;
4034                         int len;
4035
4036                         len = SCTP_MIN_V4_OVERHEAD;
4037                         if (port) {
4038                                 len += sizeof(struct udphdr);
4039                         }
4040                         newm = sctp_get_mbuf_for_msg(len, 1, M_NOWAIT, 1, MT_DATA);
4041                         if (newm == NULL) {
4042                                 sctp_m_freem(m);
4043                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
4044                                 return (ENOMEM);
4045                         }
4046                         SCTP_ALIGN_TO_END(newm, len);
4047                         SCTP_BUF_LEN(newm) = len;
4048                         SCTP_BUF_NEXT(newm) = m;
4049                         m = newm;
4050                         if (net != NULL) {
4051                                 m->m_pkthdr.flowid = net->flowid;
4052                                 M_HASHTYPE_SET(m, net->flowtype);
4053                         } else {
4054                                 m->m_pkthdr.flowid = mflowid;
4055                                 M_HASHTYPE_SET(m, mflowtype);
4056                         }
4057                         packet_length = sctp_calculate_len(m);
4058                         ip = mtod(m, struct ip *);
4059                         ip->ip_v = IPVERSION;
4060                         ip->ip_hl = (sizeof(struct ip) >> 2);
4061                         if (tos_value == 0) {
4062                                 /*
4063                                  * This means especially, that it is not set
4064                                  * at the SCTP layer. So use the value from
4065                                  * the IP layer.
4066                                  */
4067                                 tos_value = inp->ip_inp.inp.inp_ip_tos;
4068                         }
4069                         tos_value &= 0xfc;
4070                         if (ecn_ok) {
4071                                 tos_value |= sctp_get_ect(stcb);
4072                         }
4073                         if ((nofragment_flag) && (port == 0)) {
4074                                 ip->ip_off = htons(IP_DF);
4075                         } else {
4076                                 ip->ip_off = htons(0);
4077                         }
4078                         /* FreeBSD has a function for ip_id's */
4079                         ip_fillid(ip);
4080
4081                         ip->ip_ttl = inp->ip_inp.inp.inp_ip_ttl;
4082                         ip->ip_len = htons(packet_length);
4083                         ip->ip_tos = tos_value;
4084                         if (port) {
4085                                 ip->ip_p = IPPROTO_UDP;
4086                         } else {
4087                                 ip->ip_p = IPPROTO_SCTP;
4088                         }
4089                         ip->ip_sum = 0;
4090                         if (net == NULL) {
4091                                 ro = &iproute;
4092                                 memset(&iproute, 0, sizeof(iproute));
4093                                 memcpy(&ro->ro_dst, to, to->sa_len);
4094                         } else {
4095                                 ro = (sctp_route_t *)&net->ro;
4096                         }
4097                         /* Now the address selection part */
4098                         ip->ip_dst.s_addr = ((struct sockaddr_in *)to)->sin_addr.s_addr;
4099
4100                         /* call the routine to select the src address */
4101                         if (net && out_of_asoc_ok == 0) {
4102                                 if (net->ro._s_addr && (net->ro._s_addr->localifa_flags & (SCTP_BEING_DELETED | SCTP_ADDR_IFA_UNUSEABLE))) {
4103                                         sctp_free_ifa(net->ro._s_addr);
4104                                         net->ro._s_addr = NULL;
4105                                         net->src_addr_selected = 0;
4106                                         RO_NHFREE(ro);
4107                                 }
4108                                 if (net->src_addr_selected == 0) {
4109                                         /* Cache the source address */
4110                                         net->ro._s_addr = sctp_source_address_selection(inp, stcb,
4111                                             ro, net, 0,
4112                                             vrf_id);
4113                                         net->src_addr_selected = 1;
4114                                 }
4115                                 if (net->ro._s_addr == NULL) {
4116                                         /* No route to host */
4117                                         net->src_addr_selected = 0;
4118                                         sctp_handle_no_route(stcb, net, so_locked);
4119                                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4120                                         sctp_m_freem(m);
4121                                         return (EHOSTUNREACH);
4122                                 }
4123                                 ip->ip_src = net->ro._s_addr->address.sin.sin_addr;
4124                         } else {
4125                                 if (over_addr == NULL) {
4126                                         struct sctp_ifa *_lsrc;
4127
4128                                         _lsrc = sctp_source_address_selection(inp, stcb, ro,
4129                                             net,
4130                                             out_of_asoc_ok,
4131                                             vrf_id);
4132                                         if (_lsrc == NULL) {
4133                                                 sctp_handle_no_route(stcb, net, so_locked);
4134                                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4135                                                 sctp_m_freem(m);
4136                                                 return (EHOSTUNREACH);
4137                                         }
4138                                         ip->ip_src = _lsrc->address.sin.sin_addr;
4139                                         sctp_free_ifa(_lsrc);
4140                                 } else {
4141                                         ip->ip_src = over_addr->sin.sin_addr;
4142                                         SCTP_RTALLOC(ro, vrf_id, inp->fibnum);
4143                                 }
4144                         }
4145                         if (port) {
4146                                 if (htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port)) == 0) {
4147                                         sctp_handle_no_route(stcb, net, so_locked);
4148                                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4149                                         sctp_m_freem(m);
4150                                         return (EHOSTUNREACH);
4151                                 }
4152                                 udp = (struct udphdr *)((caddr_t)ip + sizeof(struct ip));
4153                                 udp->uh_sport = htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port));
4154                                 udp->uh_dport = port;
4155                                 udp->uh_ulen = htons((uint16_t)(packet_length - sizeof(struct ip)));
4156                                 if (V_udp_cksum) {
4157                                         udp->uh_sum = in_pseudo(ip->ip_src.s_addr, ip->ip_dst.s_addr, udp->uh_ulen + htons(IPPROTO_UDP));
4158                                 } else {
4159                                         udp->uh_sum = 0;
4160                                 }
4161                                 sctphdr = (struct sctphdr *)((caddr_t)udp + sizeof(struct udphdr));
4162                         } else {
4163                                 sctphdr = (struct sctphdr *)((caddr_t)ip + sizeof(struct ip));
4164                         }
4165
4166                         sctphdr->src_port = src_port;
4167                         sctphdr->dest_port = dest_port;
4168                         sctphdr->v_tag = v_tag;
4169                         sctphdr->checksum = 0;
4170
4171                         /*
4172                          * If source address selection fails and we find no
4173                          * route then the ip_output should fail as well with
4174                          * a NO_ROUTE_TO_HOST type error. We probably should
4175                          * catch that somewhere and abort the association
4176                          * right away (assuming this is an INIT being sent).
4177                          */
4178                         if (ro->ro_nh == NULL) {
4179                                 /*
4180                                  * src addr selection failed to find a route
4181                                  * (or valid source addr), so we can't get
4182                                  * there from here (yet)!
4183                                  */
4184                                 sctp_handle_no_route(stcb, net, so_locked);
4185                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4186                                 sctp_m_freem(m);
4187                                 return (EHOSTUNREACH);
4188                         }
4189                         if (ro != &iproute) {
4190                                 memcpy(&iproute, ro, sizeof(*ro));
4191                         }
4192                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "Calling ipv4 output routine from low level src addr:%x\n",
4193                             (uint32_t)(ntohl(ip->ip_src.s_addr)));
4194                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "Destination is %x\n",
4195                             (uint32_t)(ntohl(ip->ip_dst.s_addr)));
4196                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "RTP route is %p through\n",
4197                             (void *)ro->ro_nh);
4198
4199                         if (SCTP_GET_HEADER_FOR_OUTPUT(o_pak)) {
4200                                 /* failed to prepend data, give up */
4201                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
4202                                 sctp_m_freem(m);
4203                                 return (ENOMEM);
4204                         }
4205                         SCTP_ATTACH_CHAIN(o_pak, m, packet_length);
4206                         if (port) {
4207                                 sctphdr->checksum = sctp_calculate_cksum(m, sizeof(struct ip) + sizeof(struct udphdr));
4208                                 SCTP_STAT_INCR(sctps_sendswcrc);
4209                                 if (V_udp_cksum) {
4210                                         SCTP_ENABLE_UDP_CSUM(o_pak);
4211                                 }
4212                         } else {
4213                                 m->m_pkthdr.csum_flags = CSUM_SCTP;
4214                                 m->m_pkthdr.csum_data = offsetof(struct sctphdr, checksum);
4215                                 SCTP_STAT_INCR(sctps_sendhwcrc);
4216                         }
4217 #ifdef SCTP_PACKET_LOGGING
4218                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING)
4219                                 sctp_packet_log(o_pak);
4220 #endif
4221                         /* send it out.  table id is taken from stcb */
4222                         SCTP_PROBE5(send, NULL, stcb, ip, stcb, sctphdr);
4223                         SCTP_IP_OUTPUT(ret, o_pak, ro, stcb, vrf_id);
4224                         if (port) {
4225                                 UDPSTAT_INC(udps_opackets);
4226                         }
4227                         SCTP_STAT_INCR(sctps_sendpackets);
4228                         SCTP_STAT_INCR_COUNTER64(sctps_outpackets);
4229                         if (ret)
4230                                 SCTP_STAT_INCR(sctps_senderrors);
4231
4232                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "IP output returns %d\n", ret);
4233                         if (net == NULL) {
4234                                 /* free tempy routes */
4235                                 RO_NHFREE(ro);
4236                         } else {
4237                                 if ((ro->ro_nh != NULL) && (net->ro._s_addr) &&
4238                                     ((net->dest_state & SCTP_ADDR_NO_PMTUD) == 0)) {
4239                                         uint32_t mtu;
4240
4241                                         mtu = SCTP_GATHER_MTU_FROM_ROUTE(net->ro._s_addr, &net->ro._l_addr.sa, ro->ro_nh);
4242                                         if (mtu > 0) {
4243                                                 if (net->port) {
4244                                                         mtu -= sizeof(struct udphdr);
4245                                                 }
4246                                                 if (mtu < net->mtu) {
4247                                                         if ((stcb != NULL) && (stcb->asoc.smallest_mtu > mtu)) {
4248                                                                 sctp_mtu_size_reset(inp, &stcb->asoc, mtu);
4249                                                         }
4250                                                         net->mtu = mtu;
4251                                                 }
4252                                         }
4253                                 } else if (ro->ro_nh == NULL) {
4254                                         /* route was freed */
4255                                         if (net->ro._s_addr &&
4256                                             net->src_addr_selected) {
4257                                                 sctp_free_ifa(net->ro._s_addr);
4258                                                 net->ro._s_addr = NULL;
4259                                         }
4260                                         net->src_addr_selected = 0;
4261                                 }
4262                         }
4263                         return (ret);
4264                 }
4265 #endif
4266 #ifdef INET6
4267         case AF_INET6:
4268                 {
4269                         uint32_t flowlabel, flowinfo;
4270                         struct ip6_hdr *ip6h;
4271                         struct route_in6 ip6route;
4272                         struct ifnet *ifp;
4273                         struct sockaddr_in6 *sin6, tmp, *lsa6, lsa6_tmp;
4274                         int prev_scope = 0;
4275                         struct sockaddr_in6 lsa6_storage;
4276                         int error;
4277                         u_short prev_port = 0;
4278                         int len;
4279
4280                         if (net) {
4281                                 flowlabel = net->flowlabel;
4282                         } else if (stcb) {
4283                                 flowlabel = stcb->asoc.default_flowlabel;
4284                         } else {
4285                                 flowlabel = inp->sctp_ep.default_flowlabel;
4286                         }
4287                         if (flowlabel == 0) {
4288                                 /*
4289                                  * This means especially, that it is not set
4290                                  * at the SCTP layer. So use the value from
4291                                  * the IP layer.
4292                                  */
4293                                 flowlabel = ntohl(((struct inpcb *)inp)->inp_flow);
4294                         }
4295                         flowlabel &= 0x000fffff;
4296                         len = SCTP_MIN_OVERHEAD;
4297                         if (port) {
4298                                 len += sizeof(struct udphdr);
4299                         }
4300                         newm = sctp_get_mbuf_for_msg(len, 1, M_NOWAIT, 1, MT_DATA);
4301                         if (newm == NULL) {
4302                                 sctp_m_freem(m);
4303                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
4304                                 return (ENOMEM);
4305                         }
4306                         SCTP_ALIGN_TO_END(newm, len);
4307                         SCTP_BUF_LEN(newm) = len;
4308                         SCTP_BUF_NEXT(newm) = m;
4309                         m = newm;
4310                         if (net != NULL) {
4311                                 m->m_pkthdr.flowid = net->flowid;
4312                                 M_HASHTYPE_SET(m, net->flowtype);
4313                         } else {
4314                                 m->m_pkthdr.flowid = mflowid;
4315                                 M_HASHTYPE_SET(m, mflowtype);
4316                         }
4317                         packet_length = sctp_calculate_len(m);
4318
4319                         ip6h = mtod(m, struct ip6_hdr *);
4320                         /* protect *sin6 from overwrite */
4321                         sin6 = (struct sockaddr_in6 *)to;
4322                         tmp = *sin6;
4323                         sin6 = &tmp;
4324
4325                         /* KAME hack: embed scopeid */
4326                         if (sa6_embedscope(sin6, MODULE_GLOBAL(ip6_use_defzone)) != 0) {
4327                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
4328                                 sctp_m_freem(m);
4329                                 return (EINVAL);
4330                         }
4331                         if (net == NULL) {
4332                                 memset(&ip6route, 0, sizeof(ip6route));
4333                                 ro = (sctp_route_t *)&ip6route;
4334                                 memcpy(&ro->ro_dst, sin6, sin6->sin6_len);
4335                         } else {
4336                                 ro = (sctp_route_t *)&net->ro;
4337                         }
4338                         /*
4339                          * We assume here that inp_flow is in host byte
4340                          * order within the TCB!
4341                          */
4342                         if (tos_value == 0) {
4343                                 /*
4344                                  * This means especially, that it is not set
4345                                  * at the SCTP layer. So use the value from
4346                                  * the IP layer.
4347                                  */
4348                                 tos_value = (ntohl(((struct inpcb *)inp)->inp_flow) >> 20) & 0xff;
4349                         }
4350                         tos_value &= 0xfc;
4351                         if (ecn_ok) {
4352                                 tos_value |= sctp_get_ect(stcb);
4353                         }
4354                         flowinfo = 0x06;
4355                         flowinfo <<= 8;
4356                         flowinfo |= tos_value;
4357                         flowinfo <<= 20;
4358                         flowinfo |= flowlabel;
4359                         ip6h->ip6_flow = htonl(flowinfo);
4360                         if (port) {
4361                                 ip6h->ip6_nxt = IPPROTO_UDP;
4362                         } else {
4363                                 ip6h->ip6_nxt = IPPROTO_SCTP;
4364                         }
4365                         ip6h->ip6_plen = htons((uint16_t)(packet_length - sizeof(struct ip6_hdr)));
4366                         ip6h->ip6_dst = sin6->sin6_addr;
4367
4368                         /*
4369                          * Add SRC address selection here: we can only reuse
4370                          * to a limited degree the kame src-addr-sel, since
4371                          * we can try their selection but it may not be
4372                          * bound.
4373                          */
4374                         memset(&lsa6_tmp, 0, sizeof(lsa6_tmp));
4375                         lsa6_tmp.sin6_family = AF_INET6;
4376                         lsa6_tmp.sin6_len = sizeof(lsa6_tmp);
4377                         lsa6 = &lsa6_tmp;
4378                         if (net && out_of_asoc_ok == 0) {
4379                                 if (net->ro._s_addr && (net->ro._s_addr->localifa_flags & (SCTP_BEING_DELETED | SCTP_ADDR_IFA_UNUSEABLE))) {
4380                                         sctp_free_ifa(net->ro._s_addr);
4381                                         net->ro._s_addr = NULL;
4382                                         net->src_addr_selected = 0;
4383                                         RO_NHFREE(ro);
4384                                 }
4385                                 if (net->src_addr_selected == 0) {
4386                                         sin6 = (struct sockaddr_in6 *)&net->ro._l_addr;
4387                                         /* KAME hack: embed scopeid */
4388                                         if (sa6_embedscope(sin6, MODULE_GLOBAL(ip6_use_defzone)) != 0) {
4389                                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
4390                                                 sctp_m_freem(m);
4391                                                 return (EINVAL);
4392                                         }
4393                                         /* Cache the source address */
4394                                         net->ro._s_addr = sctp_source_address_selection(inp,
4395                                             stcb,
4396                                             ro,
4397                                             net,
4398                                             0,
4399                                             vrf_id);
4400                                         (void)sa6_recoverscope(sin6);
4401                                         net->src_addr_selected = 1;
4402                                 }
4403                                 if (net->ro._s_addr == NULL) {
4404                                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "V6:No route to host\n");
4405                                         net->src_addr_selected = 0;
4406                                         sctp_handle_no_route(stcb, net, so_locked);
4407                                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4408                                         sctp_m_freem(m);
4409                                         return (EHOSTUNREACH);
4410                                 }
4411                                 lsa6->sin6_addr = net->ro._s_addr->address.sin6.sin6_addr;
4412                         } else {
4413                                 sin6 = (struct sockaddr_in6 *)&ro->ro_dst;
4414                                 /* KAME hack: embed scopeid */
4415                                 if (sa6_embedscope(sin6, MODULE_GLOBAL(ip6_use_defzone)) != 0) {
4416                                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
4417                                         sctp_m_freem(m);
4418                                         return (EINVAL);
4419                                 }
4420                                 if (over_addr == NULL) {
4421                                         struct sctp_ifa *_lsrc;
4422
4423                                         _lsrc = sctp_source_address_selection(inp, stcb, ro,
4424                                             net,
4425                                             out_of_asoc_ok,
4426                                             vrf_id);
4427                                         if (_lsrc == NULL) {
4428                                                 sctp_handle_no_route(stcb, net, so_locked);
4429                                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4430                                                 sctp_m_freem(m);
4431                                                 return (EHOSTUNREACH);
4432                                         }
4433                                         lsa6->sin6_addr = _lsrc->address.sin6.sin6_addr;
4434                                         sctp_free_ifa(_lsrc);
4435                                 } else {
4436                                         lsa6->sin6_addr = over_addr->sin6.sin6_addr;
4437                                         SCTP_RTALLOC(ro, vrf_id, inp->fibnum);
4438                                 }
4439                                 (void)sa6_recoverscope(sin6);
4440                         }
4441                         lsa6->sin6_port = inp->sctp_lport;
4442
4443                         if (ro->ro_nh == NULL) {
4444                                 /*
4445                                  * src addr selection failed to find a route
4446                                  * (or valid source addr), so we can't get
4447                                  * there from here!
4448                                  */
4449                                 sctp_handle_no_route(stcb, net, so_locked);
4450                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4451                                 sctp_m_freem(m);
4452                                 return (EHOSTUNREACH);
4453                         }
4454                         /*
4455                          * XXX: sa6 may not have a valid sin6_scope_id in
4456                          * the non-SCOPEDROUTING case.
4457                          */
4458                         memset(&lsa6_storage, 0, sizeof(lsa6_storage));
4459                         lsa6_storage.sin6_family = AF_INET6;
4460                         lsa6_storage.sin6_len = sizeof(lsa6_storage);
4461                         lsa6_storage.sin6_addr = lsa6->sin6_addr;
4462                         if ((error = sa6_recoverscope(&lsa6_storage)) != 0) {
4463                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "recover scope fails error %d\n", error);
4464                                 sctp_m_freem(m);
4465                                 return (error);
4466                         }
4467                         /* XXX */
4468                         lsa6_storage.sin6_addr = lsa6->sin6_addr;
4469                         lsa6_storage.sin6_port = inp->sctp_lport;
4470                         lsa6 = &lsa6_storage;
4471                         ip6h->ip6_src = lsa6->sin6_addr;
4472
4473                         if (port) {
4474                                 if (htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port)) == 0) {
4475                                         sctp_handle_no_route(stcb, net, so_locked);
4476                                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4477                                         sctp_m_freem(m);
4478                                         return (EHOSTUNREACH);
4479                                 }
4480                                 udp = (struct udphdr *)((caddr_t)ip6h + sizeof(struct ip6_hdr));
4481                                 udp->uh_sport = htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port));
4482                                 udp->uh_dport = port;
4483                                 udp->uh_ulen = htons((uint16_t)(packet_length - sizeof(struct ip6_hdr)));
4484                                 udp->uh_sum = 0;
4485                                 sctphdr = (struct sctphdr *)((caddr_t)udp + sizeof(struct udphdr));
4486                         } else {
4487                                 sctphdr = (struct sctphdr *)((caddr_t)ip6h + sizeof(struct ip6_hdr));
4488                         }
4489
4490                         sctphdr->src_port = src_port;
4491                         sctphdr->dest_port = dest_port;
4492                         sctphdr->v_tag = v_tag;
4493                         sctphdr->checksum = 0;
4494
4495                         /*
4496                          * We set the hop limit now since there is a good
4497                          * chance that our ro pointer is now filled
4498                          */
4499                         ip6h->ip6_hlim = SCTP_GET_HLIM(inp, ro);
4500                         ifp = SCTP_GET_IFN_VOID_FROM_ROUTE(ro);
4501
4502 #ifdef SCTP_DEBUG
4503                         /* Copy to be sure something bad is not happening */
4504                         sin6->sin6_addr = ip6h->ip6_dst;
4505                         lsa6->sin6_addr = ip6h->ip6_src;
4506 #endif
4507
4508                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "Calling ipv6 output routine from low level\n");
4509                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "src: ");
4510                         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT3, (struct sockaddr *)lsa6);
4511                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "dst: ");
4512                         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT3, (struct sockaddr *)sin6);
4513                         if (net) {
4514                                 sin6 = (struct sockaddr_in6 *)&net->ro._l_addr;
4515                                 /*
4516                                  * preserve the port and scope for link
4517                                  * local send
4518                                  */
4519                                 prev_scope = sin6->sin6_scope_id;
4520                                 prev_port = sin6->sin6_port;
4521                         }
4522
4523                         if (SCTP_GET_HEADER_FOR_OUTPUT(o_pak)) {
4524                                 /* failed to prepend data, give up */
4525                                 sctp_m_freem(m);
4526                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
4527                                 return (ENOMEM);
4528                         }
4529                         SCTP_ATTACH_CHAIN(o_pak, m, packet_length);
4530                         if (port) {
4531                                 sctphdr->checksum = sctp_calculate_cksum(m, sizeof(struct ip6_hdr) + sizeof(struct udphdr));
4532                                 SCTP_STAT_INCR(sctps_sendswcrc);
4533                                 if ((udp->uh_sum = in6_cksum(o_pak, IPPROTO_UDP, sizeof(struct ip6_hdr), packet_length - sizeof(struct ip6_hdr))) == 0) {
4534                                         udp->uh_sum = 0xffff;
4535                                 }
4536                         } else {
4537                                 m->m_pkthdr.csum_flags = CSUM_SCTP_IPV6;
4538                                 m->m_pkthdr.csum_data = offsetof(struct sctphdr, checksum);
4539                                 SCTP_STAT_INCR(sctps_sendhwcrc);
4540                         }
4541                         /* send it out. table id is taken from stcb */
4542 #ifdef SCTP_PACKET_LOGGING
4543                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING)
4544                                 sctp_packet_log(o_pak);
4545 #endif
4546                         SCTP_PROBE5(send, NULL, stcb, ip6h, stcb, sctphdr);
4547                         SCTP_IP6_OUTPUT(ret, o_pak, (struct route_in6 *)ro, &ifp, stcb, vrf_id);
4548                         if (net) {
4549                                 /* for link local this must be done */
4550                                 sin6->sin6_scope_id = prev_scope;
4551                                 sin6->sin6_port = prev_port;
4552                         }
4553                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "return from send is %d\n", ret);
4554                         if (port) {
4555                                 UDPSTAT_INC(udps_opackets);
4556                         }
4557                         SCTP_STAT_INCR(sctps_sendpackets);
4558                         SCTP_STAT_INCR_COUNTER64(sctps_outpackets);
4559                         if (ret) {
4560                                 SCTP_STAT_INCR(sctps_senderrors);
4561                         }
4562                         if (net == NULL) {
4563                                 /* Now if we had a temp route free it */
4564                                 RO_NHFREE(ro);
4565                         } else {
4566                                 /*
4567                                  * PMTU check versus smallest asoc MTU goes
4568                                  * here
4569                                  */
4570                                 if (ro->ro_nh == NULL) {
4571                                         /* Route was freed */
4572                                         if (net->ro._s_addr &&
4573                                             net->src_addr_selected) {
4574                                                 sctp_free_ifa(net->ro._s_addr);
4575                                                 net->ro._s_addr = NULL;
4576                                         }
4577                                         net->src_addr_selected = 0;
4578                                 }
4579                                 if ((ro->ro_nh != NULL) && (net->ro._s_addr) &&
4580                                     ((net->dest_state & SCTP_ADDR_NO_PMTUD) == 0)) {
4581                                         uint32_t mtu;
4582
4583                                         mtu = SCTP_GATHER_MTU_FROM_ROUTE(net->ro._s_addr, &net->ro._l_addr.sa, ro->ro_nh);
4584                                         if (mtu > 0) {
4585                                                 if (net->port) {
4586                                                         mtu -= sizeof(struct udphdr);
4587                                                 }
4588                                                 if (mtu < net->mtu) {
4589                                                         if ((stcb != NULL) && (stcb->asoc.smallest_mtu > mtu)) {
4590                                                                 sctp_mtu_size_reset(inp, &stcb->asoc, mtu);
4591                                                         }
4592                                                         net->mtu = mtu;
4593                                                 }
4594                                         }
4595                                 } else if (ifp) {
4596                                         if (ND_IFINFO(ifp)->linkmtu &&
4597                                             (stcb->asoc.smallest_mtu > ND_IFINFO(ifp)->linkmtu)) {
4598                                                 sctp_mtu_size_reset(inp,
4599                                                     &stcb->asoc,
4600                                                     ND_IFINFO(ifp)->linkmtu);
4601                                         }
4602                                 }
4603                         }
4604                         return (ret);
4605                 }
4606 #endif
4607         default:
4608                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Unknown protocol (TSNH) type %d\n",
4609                     ((struct sockaddr *)to)->sa_family);
4610                 sctp_m_freem(m);
4611                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EFAULT);
4612                 return (EFAULT);
4613         }
4614 }
4615
4616 void
4617 sctp_send_initiate(struct sctp_inpcb *inp, struct sctp_tcb *stcb, int so_locked)
4618 {
4619         struct mbuf *m, *m_last;
4620         struct sctp_nets *net;
4621         struct sctp_init_chunk *init;
4622         struct sctp_supported_addr_param *sup_addr;
4623         struct sctp_adaptation_layer_indication *ali;
4624         struct sctp_supported_chunk_types_param *pr_supported;
4625         struct sctp_paramhdr *ph;
4626         int cnt_inits_to = 0;
4627         int error;
4628         uint16_t num_ext, chunk_len, padding_len, parameter_len;
4629
4630         /* INIT's always go to the primary (and usually ONLY address) */
4631         net = stcb->asoc.primary_destination;
4632         if (net == NULL) {
4633                 net = TAILQ_FIRST(&stcb->asoc.nets);
4634                 if (net == NULL) {
4635                         /* TSNH */
4636                         return;
4637                 }
4638                 /* we confirm any address we send an INIT to */
4639                 net->dest_state &= ~SCTP_ADDR_UNCONFIRMED;
4640                 (void)sctp_set_primary_addr(stcb, NULL, net);
4641         } else {
4642                 /* we confirm any address we send an INIT to */
4643                 net->dest_state &= ~SCTP_ADDR_UNCONFIRMED;
4644         }
4645         SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT\n");
4646 #ifdef INET6
4647         if (net->ro._l_addr.sa.sa_family == AF_INET6) {
4648                 /*
4649                  * special hook, if we are sending to link local it will not
4650                  * show up in our private address count.
4651                  */
4652                 if (IN6_IS_ADDR_LINKLOCAL(&net->ro._l_addr.sin6.sin6_addr))
4653                         cnt_inits_to = 1;
4654         }
4655 #endif
4656         if (SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
4657                 /* This case should not happen */
4658                 SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT - failed timer?\n");
4659                 return;
4660         }
4661         /* start the INIT timer */
4662         sctp_timer_start(SCTP_TIMER_TYPE_INIT, inp, stcb, net);
4663
4664         m = sctp_get_mbuf_for_msg(MCLBYTES, 1, M_NOWAIT, 1, MT_DATA);
4665         if (m == NULL) {
4666                 /* No memory, INIT timer will re-attempt. */
4667                 SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT - mbuf?\n");
4668                 return;
4669         }
4670         chunk_len = (uint16_t)sizeof(struct sctp_init_chunk);
4671         padding_len = 0;
4672         /* Now lets put the chunk header in place */
4673         init = mtod(m, struct sctp_init_chunk *);
4674         /* now the chunk header */
4675         init->ch.chunk_type = SCTP_INITIATION;
4676         init->ch.chunk_flags = 0;
4677         /* fill in later from mbuf we build */
4678         init->ch.chunk_length = 0;
4679         /* place in my tag */
4680         init->init.initiate_tag = htonl(stcb->asoc.my_vtag);
4681         /* set up some of the credits. */
4682         init->init.a_rwnd = htonl(max(inp->sctp_socket ? SCTP_SB_LIMIT_RCV(inp->sctp_socket) : 0,
4683             SCTP_MINIMAL_RWND));
4684         init->init.num_outbound_streams = htons(stcb->asoc.pre_open_streams);
4685         init->init.num_inbound_streams = htons(stcb->asoc.max_inbound_streams);
4686         init->init.initial_tsn = htonl(stcb->asoc.init_seq_number);
4687
4688         /* Adaptation layer indication parameter */
4689         if (inp->sctp_ep.adaptation_layer_indicator_provided) {
4690                 parameter_len = (uint16_t)sizeof(struct sctp_adaptation_layer_indication);
4691                 ali = (struct sctp_adaptation_layer_indication *)(mtod(m, caddr_t)+chunk_len);
4692                 ali->ph.param_type = htons(SCTP_ULP_ADAPTATION);
4693                 ali->ph.param_length = htons(parameter_len);
4694                 ali->indication = htonl(inp->sctp_ep.adaptation_layer_indicator);
4695                 chunk_len += parameter_len;
4696         }
4697
4698         /* ECN parameter */
4699         if (stcb->asoc.ecn_supported == 1) {
4700                 parameter_len = (uint16_t)sizeof(struct sctp_paramhdr);
4701                 ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
4702                 ph->param_type = htons(SCTP_ECN_CAPABLE);
4703                 ph->param_length = htons(parameter_len);
4704                 chunk_len += parameter_len;
4705         }
4706
4707         /* PR-SCTP supported parameter */
4708         if (stcb->asoc.prsctp_supported == 1) {
4709                 parameter_len = (uint16_t)sizeof(struct sctp_paramhdr);
4710                 ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
4711                 ph->param_type = htons(SCTP_PRSCTP_SUPPORTED);
4712                 ph->param_length = htons(parameter_len);
4713                 chunk_len += parameter_len;
4714         }
4715
4716         /* Add NAT friendly parameter. */
4717         if (SCTP_BASE_SYSCTL(sctp_inits_include_nat_friendly)) {
4718                 parameter_len = (uint16_t)sizeof(struct sctp_paramhdr);
4719                 ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
4720                 ph->param_type = htons(SCTP_HAS_NAT_SUPPORT);
4721                 ph->param_length = htons(parameter_len);
4722                 chunk_len += parameter_len;
4723         }
4724
4725         /* And now tell the peer which extensions we support */
4726         num_ext = 0;
4727         pr_supported = (struct sctp_supported_chunk_types_param *)(mtod(m, caddr_t)+chunk_len);
4728         if (stcb->asoc.prsctp_supported == 1) {
4729                 pr_supported->chunk_types[num_ext++] = SCTP_FORWARD_CUM_TSN;
4730                 if (stcb->asoc.idata_supported) {
4731                         pr_supported->chunk_types[num_ext++] = SCTP_IFORWARD_CUM_TSN;
4732                 }
4733         }
4734         if (stcb->asoc.auth_supported == 1) {
4735                 pr_supported->chunk_types[num_ext++] = SCTP_AUTHENTICATION;
4736         }
4737         if (stcb->asoc.asconf_supported == 1) {
4738                 pr_supported->chunk_types[num_ext++] = SCTP_ASCONF;
4739                 pr_supported->chunk_types[num_ext++] = SCTP_ASCONF_ACK;
4740         }
4741         if (stcb->asoc.reconfig_supported == 1) {
4742                 pr_supported->chunk_types[num_ext++] = SCTP_STREAM_RESET;
4743         }
4744         if (stcb->asoc.idata_supported) {
4745                 pr_supported->chunk_types[num_ext++] = SCTP_IDATA;
4746         }
4747         if (stcb->asoc.nrsack_supported == 1) {
4748                 pr_supported->chunk_types[num_ext++] = SCTP_NR_SELECTIVE_ACK;
4749         }
4750         if (stcb->asoc.pktdrop_supported == 1) {
4751                 pr_supported->chunk_types[num_ext++] = SCTP_PACKET_DROPPED;
4752         }
4753         if (num_ext > 0) {
4754                 parameter_len = (uint16_t)sizeof(struct sctp_supported_chunk_types_param) + num_ext;
4755                 pr_supported->ph.param_type = htons(SCTP_SUPPORTED_CHUNK_EXT);
4756                 pr_supported->ph.param_length = htons(parameter_len);
4757                 padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
4758                 chunk_len += parameter_len;
4759         }
4760         /* add authentication parameters */
4761         if (stcb->asoc.auth_supported) {
4762                 /* attach RANDOM parameter, if available */
4763                 if (stcb->asoc.authinfo.random != NULL) {
4764                         struct sctp_auth_random *randp;
4765
4766                         if (padding_len > 0) {
4767                                 memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
4768                                 chunk_len += padding_len;
4769                                 padding_len = 0;
4770                         }
4771                         randp = (struct sctp_auth_random *)(mtod(m, caddr_t)+chunk_len);
4772                         parameter_len = (uint16_t)sizeof(struct sctp_auth_random) + stcb->asoc.authinfo.random_len;
4773                         /* random key already contains the header */
4774                         memcpy(randp, stcb->asoc.authinfo.random->key, parameter_len);
4775                         padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
4776                         chunk_len += parameter_len;
4777                 }
4778                 /* add HMAC_ALGO parameter */
4779                 if (stcb->asoc.local_hmacs != NULL) {
4780                         struct sctp_auth_hmac_algo *hmacs;
4781
4782                         if (padding_len > 0) {
4783                                 memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
4784                                 chunk_len += padding_len;
4785                                 padding_len = 0;
4786                         }
4787                         hmacs = (struct sctp_auth_hmac_algo *)(mtod(m, caddr_t)+chunk_len);
4788                         parameter_len = (uint16_t)(sizeof(struct sctp_auth_hmac_algo) +
4789                             stcb->asoc.local_hmacs->num_algo * sizeof(uint16_t));
4790                         hmacs->ph.param_type = htons(SCTP_HMAC_LIST);
4791                         hmacs->ph.param_length = htons(parameter_len);
4792                         sctp_serialize_hmaclist(stcb->asoc.local_hmacs, (uint8_t *)hmacs->hmac_ids);
4793                         padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
4794                         chunk_len += parameter_len;
4795                 }
4796                 /* add CHUNKS parameter */
4797                 if (stcb->asoc.local_auth_chunks != NULL) {
4798                         struct sctp_auth_chunk_list *chunks;
4799
4800                         if (padding_len > 0) {
4801                                 memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
4802                                 chunk_len += padding_len;
4803                                 padding_len = 0;
4804                         }
4805                         chunks = (struct sctp_auth_chunk_list *)(mtod(m, caddr_t)+chunk_len);
4806                         parameter_len = (uint16_t)(sizeof(struct sctp_auth_chunk_list) +
4807                             sctp_auth_get_chklist_size(stcb->asoc.local_auth_chunks));
4808                         chunks->ph.param_type = htons(SCTP_CHUNK_LIST);
4809                         chunks->ph.param_length = htons(parameter_len);
4810                         sctp_serialize_auth_chunks(stcb->asoc.local_auth_chunks, chunks->chunk_types);
4811                         padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
4812                         chunk_len += parameter_len;
4813                 }
4814         }
4815
4816         /* now any cookie time extensions */
4817         if (stcb->asoc.cookie_preserve_req > 0) {
4818                 struct sctp_cookie_perserve_param *cookie_preserve;
4819
4820                 if (padding_len > 0) {
4821                         memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
4822                         chunk_len += padding_len;
4823                         padding_len = 0;
4824                 }
4825                 parameter_len = (uint16_t)sizeof(struct sctp_cookie_perserve_param);
4826                 cookie_preserve = (struct sctp_cookie_perserve_param *)(mtod(m, caddr_t)+chunk_len);
4827                 cookie_preserve->ph.param_type = htons(SCTP_COOKIE_PRESERVE);
4828                 cookie_preserve->ph.param_length = htons(parameter_len);
4829                 cookie_preserve->time = htonl(stcb->asoc.cookie_preserve_req);
4830                 stcb->asoc.cookie_preserve_req = 0;
4831                 chunk_len += parameter_len;
4832         }
4833
4834         if (stcb->asoc.scope.ipv4_addr_legal || stcb->asoc.scope.ipv6_addr_legal) {
4835                 uint8_t i;
4836
4837                 if (padding_len > 0) {
4838                         memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
4839                         chunk_len += padding_len;
4840                         padding_len = 0;
4841                 }
4842                 parameter_len = (uint16_t)sizeof(struct sctp_paramhdr);
4843                 if (stcb->asoc.scope.ipv4_addr_legal) {
4844                         parameter_len += (uint16_t)sizeof(uint16_t);
4845                 }
4846                 if (stcb->asoc.scope.ipv6_addr_legal) {
4847                         parameter_len += (uint16_t)sizeof(uint16_t);
4848                 }
4849                 sup_addr = (struct sctp_supported_addr_param *)(mtod(m, caddr_t)+chunk_len);
4850                 sup_addr->ph.param_type = htons(SCTP_SUPPORTED_ADDRTYPE);
4851                 sup_addr->ph.param_length = htons(parameter_len);
4852                 i = 0;
4853                 if (stcb->asoc.scope.ipv4_addr_legal) {
4854                         sup_addr->addr_type[i++] = htons(SCTP_IPV4_ADDRESS);
4855                 }
4856                 if (stcb->asoc.scope.ipv6_addr_legal) {
4857                         sup_addr->addr_type[i++] = htons(SCTP_IPV6_ADDRESS);
4858                 }
4859                 padding_len = 4 - 2 * i;
4860                 chunk_len += parameter_len;
4861         }
4862
4863         SCTP_BUF_LEN(m) = chunk_len;
4864         /* now the addresses */
4865         /*
4866          * To optimize this we could put the scoping stuff into a structure
4867          * and remove the individual uint8's from the assoc structure. Then
4868          * we could just sifa in the address within the stcb. But for now
4869          * this is a quick hack to get the address stuff teased apart.
4870          */
4871         m_last = sctp_add_addresses_to_i_ia(inp, stcb, &stcb->asoc.scope,
4872             m, cnt_inits_to,
4873             &padding_len, &chunk_len);
4874
4875         init->ch.chunk_length = htons(chunk_len);
4876         if (padding_len > 0) {
4877                 if (sctp_add_pad_tombuf(m_last, padding_len) == NULL) {
4878                         sctp_m_freem(m);
4879                         return;
4880                 }
4881         }
4882         SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT - calls lowlevel_output\n");
4883         if ((error = sctp_lowlevel_chunk_output(inp, stcb, net,
4884             (struct sockaddr *)&net->ro._l_addr,
4885             m, 0, NULL, 0, 0, 0, 0,
4886             inp->sctp_lport, stcb->rport, htonl(0),
4887             net->port, NULL,
4888             0, 0,
4889             so_locked))) {
4890                 SCTPDBG(SCTP_DEBUG_OUTPUT4, "Gak send error %d\n", error);
4891                 if (error == ENOBUFS) {
4892                         stcb->asoc.ifp_had_enobuf = 1;
4893                         SCTP_STAT_INCR(sctps_lowlevelerr);
4894                 }
4895         } else {
4896                 stcb->asoc.ifp_had_enobuf = 0;
4897         }
4898         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
4899         (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
4900 }
4901
4902 struct mbuf *
4903 sctp_arethere_unrecognized_parameters(struct mbuf *in_initpkt,
4904     int param_offset, int *abort_processing,
4905     struct sctp_chunkhdr *cp,
4906     int *nat_friendly,
4907     int *cookie_found)
4908 {
4909         /*
4910          * Given a mbuf containing an INIT or INIT-ACK with the param_offset
4911          * being equal to the beginning of the params i.e. (iphlen +
4912          * sizeof(struct sctp_init_msg) parse through the parameters to the
4913          * end of the mbuf verifying that all parameters are known.
4914          *
4915          * For unknown parameters build and return a mbuf with
4916          * UNRECOGNIZED_PARAMETER errors. If the flags indicate to stop
4917          * processing this chunk stop, and set *abort_processing to 1.
4918          *
4919          * By having param_offset be pre-set to where parameters begin it is
4920          * hoped that this routine may be reused in the future by new
4921          * features.
4922          */
4923         struct sctp_paramhdr *phdr, params;
4924
4925         struct mbuf *mat, *m_tmp, *op_err, *op_err_last;
4926         int at, limit, pad_needed;
4927         uint16_t ptype, plen, padded_size;
4928
4929         *abort_processing = 0;
4930         if (cookie_found != NULL) {
4931                 *cookie_found = 0;
4932         }
4933         mat = in_initpkt;
4934         limit = ntohs(cp->chunk_length) - sizeof(struct sctp_init_chunk);
4935         at = param_offset;
4936         op_err = NULL;
4937         op_err_last = NULL;
4938         pad_needed = 0;
4939         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Check for unrecognized param's\n");
4940         phdr = sctp_get_next_param(mat, at, &params, sizeof(params));
4941         while ((phdr != NULL) && ((size_t)limit >= sizeof(struct sctp_paramhdr))) {
4942                 ptype = ntohs(phdr->param_type);
4943                 plen = ntohs(phdr->param_length);
4944                 if ((plen > limit) || (plen < sizeof(struct sctp_paramhdr))) {
4945                         /* wacked parameter */
4946                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error %d\n", plen);
4947                         goto invalid_size;
4948                 }
4949                 limit -= SCTP_SIZE32(plen);
4950                 /*-
4951                  * All parameters for all chunks that we know/understand are
4952                  * listed here. We process them other places and make
4953                  * appropriate stop actions per the upper bits. However this
4954                  * is the generic routine processor's can call to get back
4955                  * an operr.. to either incorporate (init-ack) or send.
4956                  */
4957                 padded_size = SCTP_SIZE32(plen);
4958                 switch (ptype) {
4959                         /* Param's with variable size */
4960                 case SCTP_HEARTBEAT_INFO:
4961                 case SCTP_UNRECOG_PARAM:
4962                 case SCTP_ERROR_CAUSE_IND:
4963                         /* ok skip fwd */
4964                         at += padded_size;
4965                         break;
4966                 case SCTP_STATE_COOKIE:
4967                         if (cookie_found != NULL) {
4968                                 *cookie_found = 1;
4969                         }
4970                         at += padded_size;
4971                         break;
4972                         /* Param's with variable size within a range */
4973                 case SCTP_CHUNK_LIST:
4974                 case SCTP_SUPPORTED_CHUNK_EXT:
4975                         if (padded_size > (sizeof(struct sctp_supported_chunk_types_param) + (sizeof(uint8_t) * SCTP_MAX_SUPPORTED_EXT))) {
4976                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error chklist %d\n", plen);
4977                                 goto invalid_size;
4978                         }
4979                         at += padded_size;
4980                         break;
4981                 case SCTP_SUPPORTED_ADDRTYPE:
4982                         if (padded_size > SCTP_MAX_ADDR_PARAMS_SIZE) {
4983                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error supaddrtype %d\n", plen);
4984                                 goto invalid_size;
4985                         }
4986                         at += padded_size;
4987                         break;
4988                 case SCTP_RANDOM:
4989                         if (padded_size > (sizeof(struct sctp_auth_random) + SCTP_RANDOM_MAX_SIZE)) {
4990                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error random %d\n", plen);
4991                                 goto invalid_size;
4992                         }
4993                         at += padded_size;
4994                         break;
4995                 case SCTP_SET_PRIM_ADDR:
4996                 case SCTP_DEL_IP_ADDRESS:
4997                 case SCTP_ADD_IP_ADDRESS:
4998                         if ((padded_size != sizeof(struct sctp_asconf_addrv4_param)) &&
4999                             (padded_size != sizeof(struct sctp_asconf_addr_param))) {
5000                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error setprim %d\n", plen);
5001                                 goto invalid_size;
5002                         }
5003                         at += padded_size;
5004                         break;
5005                         /* Param's with a fixed size */
5006                 case SCTP_IPV4_ADDRESS:
5007                         if (padded_size != sizeof(struct sctp_ipv4addr_param)) {
5008                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error ipv4 addr %d\n", plen);
5009                                 goto invalid_size;
5010                         }
5011                         at += padded_size;
5012                         break;
5013                 case SCTP_IPV6_ADDRESS:
5014                         if (padded_size != sizeof(struct sctp_ipv6addr_param)) {
5015                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error ipv6 addr %d\n", plen);
5016                                 goto invalid_size;
5017                         }
5018                         at += padded_size;
5019                         break;
5020                 case SCTP_COOKIE_PRESERVE:
5021                         if (padded_size != sizeof(struct sctp_cookie_perserve_param)) {
5022                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error cookie-preserve %d\n", plen);
5023                                 goto invalid_size;
5024                         }
5025                         at += padded_size;
5026                         break;
5027                 case SCTP_HAS_NAT_SUPPORT:
5028                         *nat_friendly = 1;
5029                         /* fall through */
5030                 case SCTP_PRSCTP_SUPPORTED:
5031                         if (padded_size != sizeof(struct sctp_paramhdr)) {
5032                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error prsctp/nat support %d\n", plen);
5033                                 goto invalid_size;
5034                         }
5035                         at += padded_size;
5036                         break;
5037                 case SCTP_ECN_CAPABLE:
5038                         if (padded_size != sizeof(struct sctp_paramhdr)) {
5039                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error ecn %d\n", plen);
5040                                 goto invalid_size;
5041                         }
5042                         at += padded_size;
5043                         break;
5044                 case SCTP_ULP_ADAPTATION:
5045                         if (padded_size != sizeof(struct sctp_adaptation_layer_indication)) {
5046                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error adapatation %d\n", plen);
5047                                 goto invalid_size;
5048                         }
5049                         at += padded_size;
5050                         break;
5051                 case SCTP_SUCCESS_REPORT:
5052                         if (padded_size != sizeof(struct sctp_asconf_paramhdr)) {
5053                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error success %d\n", plen);
5054                                 goto invalid_size;
5055                         }
5056                         at += padded_size;
5057                         break;
5058                 case SCTP_HOSTNAME_ADDRESS:
5059                         {
5060                                 /* Hostname parameters are deprecated. */
5061                                 struct sctp_gen_error_cause *cause;
5062                                 int l_len;
5063
5064                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Can't handle hostname addresses.. abort processing\n");
5065                                 *abort_processing = 1;
5066                                 sctp_m_freem(op_err);
5067                                 op_err = NULL;
5068                                 op_err_last = NULL;
5069 #ifdef INET6
5070                                 l_len = SCTP_MIN_OVERHEAD;
5071 #else
5072                                 l_len = SCTP_MIN_V4_OVERHEAD;
5073 #endif
5074                                 l_len += sizeof(struct sctp_chunkhdr);
5075                                 l_len += sizeof(struct sctp_gen_error_cause);
5076                                 op_err = sctp_get_mbuf_for_msg(l_len, 0, M_NOWAIT, 1, MT_DATA);
5077                                 if (op_err != NULL) {
5078                                         /*
5079                                          * Pre-reserve space for IP, SCTP,
5080                                          * and chunk header.
5081                                          */
5082 #ifdef INET6
5083                                         SCTP_BUF_RESV_UF(op_err, sizeof(struct ip6_hdr));
5084 #else
5085                                         SCTP_BUF_RESV_UF(op_err, sizeof(struct ip));
5086 #endif
5087                                         SCTP_BUF_RESV_UF(op_err, sizeof(struct sctphdr));
5088                                         SCTP_BUF_RESV_UF(op_err, sizeof(struct sctp_chunkhdr));
5089                                         SCTP_BUF_LEN(op_err) = sizeof(struct sctp_gen_error_cause);
5090                                         cause = mtod(op_err, struct sctp_gen_error_cause *);
5091                                         cause->code = htons(SCTP_CAUSE_UNRESOLVABLE_ADDR);
5092                                         cause->length = htons((uint16_t)(sizeof(struct sctp_gen_error_cause) + plen));
5093                                         SCTP_BUF_NEXT(op_err) = SCTP_M_COPYM(mat, at, plen, M_NOWAIT);
5094                                         if (SCTP_BUF_NEXT(op_err) == NULL) {
5095                                                 sctp_m_freem(op_err);
5096                                                 op_err = NULL;
5097                                                 op_err_last = NULL;
5098                                         }
5099                                 }
5100                                 return (op_err);
5101                         }
5102                 default:
5103                         /*
5104                          * we do not recognize the parameter figure out what
5105                          * we do.
5106                          */
5107                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Hit default param %x\n", ptype);
5108                         if ((ptype & 0x4000) == 0x4000) {
5109                                 /* Report bit is set?? */
5110                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "report op err\n");
5111                                 if (op_err == NULL) {
5112                                         int l_len;
5113
5114                                         /* Ok need to try to get an mbuf */
5115 #ifdef INET6
5116                                         l_len = SCTP_MIN_OVERHEAD;
5117 #else
5118                                         l_len = SCTP_MIN_V4_OVERHEAD;
5119 #endif
5120                                         l_len += sizeof(struct sctp_chunkhdr);
5121                                         l_len += sizeof(struct sctp_paramhdr);
5122                                         op_err = sctp_get_mbuf_for_msg(l_len, 0, M_NOWAIT, 1, MT_DATA);
5123                                         if (op_err) {
5124                                                 SCTP_BUF_LEN(op_err) = 0;
5125 #ifdef INET6
5126                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip6_hdr));
5127 #else
5128                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip));
5129 #endif
5130                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctphdr));
5131                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctp_chunkhdr));
5132                                                 op_err_last = op_err;
5133                                         }
5134                                 }
5135                                 if (op_err != NULL) {
5136                                         /* If we have space */
5137                                         struct sctp_paramhdr *param;
5138
5139                                         if (pad_needed > 0) {
5140                                                 op_err_last = sctp_add_pad_tombuf(op_err_last, pad_needed);
5141                                         }
5142                                         if (op_err_last == NULL) {
5143                                                 sctp_m_freem(op_err);
5144                                                 op_err = NULL;
5145                                                 op_err_last = NULL;
5146                                                 goto more_processing;
5147                                         }
5148                                         if (M_TRAILINGSPACE(op_err_last) < (int)sizeof(struct sctp_paramhdr)) {
5149                                                 m_tmp = sctp_get_mbuf_for_msg(sizeof(struct sctp_paramhdr), 0, M_NOWAIT, 1, MT_DATA);
5150                                                 if (m_tmp == NULL) {
5151                                                         sctp_m_freem(op_err);
5152                                                         op_err = NULL;
5153                                                         op_err_last = NULL;
5154                                                         goto more_processing;
5155                                                 }
5156                                                 SCTP_BUF_LEN(m_tmp) = 0;
5157                                                 SCTP_BUF_NEXT(m_tmp) = NULL;
5158                                                 SCTP_BUF_NEXT(op_err_last) = m_tmp;
5159                                                 op_err_last = m_tmp;
5160                                         }
5161                                         param = (struct sctp_paramhdr *)(mtod(op_err_last, caddr_t)+SCTP_BUF_LEN(op_err_last));
5162                                         param->param_type = htons(SCTP_UNRECOG_PARAM);
5163                                         param->param_length = htons((uint16_t)sizeof(struct sctp_paramhdr) + plen);
5164                                         SCTP_BUF_LEN(op_err_last) += sizeof(struct sctp_paramhdr);
5165                                         SCTP_BUF_NEXT(op_err_last) = SCTP_M_COPYM(mat, at, plen, M_NOWAIT);
5166                                         if (SCTP_BUF_NEXT(op_err_last) == NULL) {
5167                                                 sctp_m_freem(op_err);
5168                                                 op_err = NULL;
5169                                                 op_err_last = NULL;
5170                                                 goto more_processing;
5171                                         } else {
5172                                                 while (SCTP_BUF_NEXT(op_err_last) != NULL) {
5173                                                         op_err_last = SCTP_BUF_NEXT(op_err_last);
5174                                                 }
5175                                         }
5176                                         if (plen % 4 != 0) {
5177                                                 pad_needed = 4 - (plen % 4);
5178                                         } else {
5179                                                 pad_needed = 0;
5180                                         }
5181                                 }
5182                         }
5183         more_processing:
5184                         if ((ptype & 0x8000) == 0x0000) {
5185                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "stop proc\n");
5186                                 return (op_err);
5187                         } else {
5188                                 /* skip this chunk and continue processing */
5189                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "move on\n");
5190                                 at += SCTP_SIZE32(plen);
5191                         }
5192                         break;
5193                 }
5194                 phdr = sctp_get_next_param(mat, at, &params, sizeof(params));
5195         }
5196         return (op_err);
5197 invalid_size:
5198         SCTPDBG(SCTP_DEBUG_OUTPUT1, "abort flag set\n");
5199         *abort_processing = 1;
5200         sctp_m_freem(op_err);
5201         op_err = NULL;
5202         op_err_last = NULL;
5203         if (phdr != NULL) {
5204                 struct sctp_paramhdr *param;
5205                 int l_len;
5206 #ifdef INET6
5207                 l_len = SCTP_MIN_OVERHEAD;
5208 #else
5209                 l_len = SCTP_MIN_V4_OVERHEAD;
5210 #endif
5211                 l_len += sizeof(struct sctp_chunkhdr);
5212                 l_len += (2 * sizeof(struct sctp_paramhdr));
5213                 op_err = sctp_get_mbuf_for_msg(l_len, 0, M_NOWAIT, 1, MT_DATA);
5214                 if (op_err) {
5215                         SCTP_BUF_LEN(op_err) = 0;
5216 #ifdef INET6
5217                         SCTP_BUF_RESV_UF(op_err, sizeof(struct ip6_hdr));
5218 #else
5219                         SCTP_BUF_RESV_UF(op_err, sizeof(struct ip));
5220 #endif
5221                         SCTP_BUF_RESV_UF(op_err, sizeof(struct sctphdr));
5222                         SCTP_BUF_RESV_UF(op_err, sizeof(struct sctp_chunkhdr));
5223                         SCTP_BUF_LEN(op_err) = 2 * sizeof(struct sctp_paramhdr);
5224                         param = mtod(op_err, struct sctp_paramhdr *);
5225                         param->param_type = htons(SCTP_CAUSE_PROTOCOL_VIOLATION);
5226                         param->param_length = htons(2 * sizeof(struct sctp_paramhdr));
5227                         param++;
5228                         param->param_type = htons(ptype);
5229                         param->param_length = htons(plen);
5230                 }
5231         }
5232         return (op_err);
5233 }
5234
5235 /*
5236  * Given a INIT chunk, look through the parameters to verify that there
5237  * are no new addresses.
5238  * Return true, if there is a new address or there is a problem parsing
5239    the parameters. Provide an optional error cause used when sending an ABORT.
5240  * Return false, if there are no new addresses and there is no problem in
5241    parameter processing.
5242  */
5243 static bool
5244 sctp_are_there_new_addresses(struct sctp_association *asoc,
5245     struct mbuf *in_initpkt, int offset, int limit, struct sockaddr *src,
5246     struct mbuf **op_err)
5247 {
5248         struct sockaddr *sa_touse;
5249         struct sockaddr *sa;
5250         struct sctp_paramhdr *phdr, params;
5251         struct sctp_nets *net;
5252 #ifdef INET
5253         struct sockaddr_in sin4, *sa4;
5254 #endif
5255 #ifdef INET6
5256         struct sockaddr_in6 sin6, *sa6;
5257 #endif
5258         uint16_t ptype, plen;
5259         bool fnd, check_src;
5260
5261         *op_err = NULL;
5262 #ifdef INET
5263         memset(&sin4, 0, sizeof(sin4));
5264         sin4.sin_family = AF_INET;
5265         sin4.sin_len = sizeof(sin4);
5266 #endif
5267 #ifdef INET6
5268         memset(&sin6, 0, sizeof(sin6));
5269         sin6.sin6_family = AF_INET6;
5270         sin6.sin6_len = sizeof(sin6);
5271 #endif
5272         /* First what about the src address of the pkt ? */
5273         check_src = false;
5274         switch (src->sa_family) {
5275 #ifdef INET
5276         case AF_INET:
5277                 if (asoc->scope.ipv4_addr_legal) {
5278                         check_src = true;
5279                 }
5280                 break;
5281 #endif
5282 #ifdef INET6
5283         case AF_INET6:
5284                 if (asoc->scope.ipv6_addr_legal) {
5285                         check_src = true;
5286                 }
5287                 break;
5288 #endif
5289         default:
5290                 /* TSNH */
5291                 break;
5292         }
5293         if (check_src) {
5294                 fnd = false;
5295                 TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
5296                         sa = (struct sockaddr *)&net->ro._l_addr;
5297                         if (sa->sa_family == src->sa_family) {
5298 #ifdef INET
5299                                 if (sa->sa_family == AF_INET) {
5300                                         struct sockaddr_in *src4;
5301
5302                                         sa4 = (struct sockaddr_in *)sa;
5303                                         src4 = (struct sockaddr_in *)src;
5304                                         if (sa4->sin_addr.s_addr == src4->sin_addr.s_addr) {
5305                                                 fnd = true;
5306                                                 break;
5307                                         }
5308                                 }
5309 #endif
5310 #ifdef INET6
5311                                 if (sa->sa_family == AF_INET6) {
5312                                         struct sockaddr_in6 *src6;
5313
5314                                         sa6 = (struct sockaddr_in6 *)sa;
5315                                         src6 = (struct sockaddr_in6 *)src;
5316                                         if (SCTP6_ARE_ADDR_EQUAL(sa6, src6)) {
5317                                                 fnd = true;
5318                                                 break;
5319                                         }
5320                                 }
5321 #endif
5322                         }
5323                 }
5324                 if (!fnd) {
5325                         /*
5326                          * If sending an ABORT in case of an additional
5327                          * address, don't use the new address error cause.
5328                          * This looks no different than if no listener was
5329                          * present.
5330                          */
5331                         *op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), "Address added");
5332                         return (true);
5333                 }
5334         }
5335         /* Ok so far lets munge through the rest of the packet */
5336         offset += sizeof(struct sctp_init_chunk);
5337         phdr = sctp_get_next_param(in_initpkt, offset, &params, sizeof(params));
5338         while (phdr) {
5339                 sa_touse = NULL;
5340                 ptype = ntohs(phdr->param_type);
5341                 plen = ntohs(phdr->param_length);
5342                 if (offset + plen > limit) {
5343                         *op_err = sctp_generate_cause(SCTP_CAUSE_PROTOCOL_VIOLATION, "Partial parameter");
5344                         return (true);
5345                 }
5346                 if (plen < sizeof(struct sctp_paramhdr)) {
5347                         *op_err = sctp_generate_cause(SCTP_CAUSE_PROTOCOL_VIOLATION, "Parameter length too small");
5348                         return (true);
5349                 }
5350                 switch (ptype) {
5351 #ifdef INET
5352                 case SCTP_IPV4_ADDRESS:
5353                         {
5354                                 struct sctp_ipv4addr_param *p4, p4_buf;
5355
5356                                 if (plen != sizeof(struct sctp_ipv4addr_param)) {
5357                                         *op_err = sctp_generate_cause(SCTP_CAUSE_PROTOCOL_VIOLATION, "Parameter length illegal");
5358                                         return (true);
5359                                 }
5360                                 phdr = sctp_get_next_param(in_initpkt, offset,
5361                                     (struct sctp_paramhdr *)&p4_buf, sizeof(p4_buf));
5362                                 if (phdr == NULL) {
5363                                         *op_err = sctp_generate_cause(SCTP_CAUSE_PROTOCOL_VIOLATION, "");
5364                                         return (true);
5365                                 }
5366                                 if (asoc->scope.ipv4_addr_legal) {
5367                                         p4 = (struct sctp_ipv4addr_param *)phdr;
5368                                         sin4.sin_addr.s_addr = p4->addr;
5369                                         sa_touse = (struct sockaddr *)&sin4;
5370                                 }
5371                                 break;
5372                         }
5373 #endif
5374 #ifdef INET6
5375                 case SCTP_IPV6_ADDRESS:
5376                         {
5377                                 struct sctp_ipv6addr_param *p6, p6_buf;
5378
5379                                 if (plen != sizeof(struct sctp_ipv6addr_param)) {
5380                                         *op_err = sctp_generate_cause(SCTP_CAUSE_PROTOCOL_VIOLATION, "Parameter length illegal");
5381                                         return (true);
5382                                 }
5383                                 phdr = sctp_get_next_param(in_initpkt, offset,
5384                                     (struct sctp_paramhdr *)&p6_buf, sizeof(p6_buf));
5385                                 if (phdr == NULL) {
5386                                         *op_err = sctp_generate_cause(SCTP_CAUSE_PROTOCOL_VIOLATION, "");
5387                                         return (true);
5388                                 }
5389                                 if (asoc->scope.ipv6_addr_legal) {
5390                                         p6 = (struct sctp_ipv6addr_param *)phdr;
5391                                         memcpy((caddr_t)&sin6.sin6_addr, p6->addr,
5392                                             sizeof(p6->addr));
5393                                         sa_touse = (struct sockaddr *)&sin6;
5394                                 }
5395                                 break;
5396                         }
5397 #endif
5398                 default:
5399                         sa_touse = NULL;
5400                         break;
5401                 }
5402                 if (sa_touse) {
5403                         /* ok, sa_touse points to one to check */
5404                         fnd = false;
5405                         TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
5406                                 sa = (struct sockaddr *)&net->ro._l_addr;
5407                                 if (sa->sa_family != sa_touse->sa_family) {
5408                                         continue;
5409                                 }
5410 #ifdef INET
5411                                 if (sa->sa_family == AF_INET) {
5412                                         sa4 = (struct sockaddr_in *)sa;
5413                                         if (sa4->sin_addr.s_addr ==
5414                                             sin4.sin_addr.s_addr) {
5415                                                 fnd = true;
5416                                                 break;
5417                                         }
5418                                 }
5419 #endif
5420 #ifdef INET6
5421                                 if (sa->sa_family == AF_INET6) {
5422                                         sa6 = (struct sockaddr_in6 *)sa;
5423                                         if (SCTP6_ARE_ADDR_EQUAL(
5424                                             sa6, &sin6)) {
5425                                                 fnd = true;
5426                                                 break;
5427                                         }
5428                                 }
5429 #endif
5430                         }
5431                         if (!fnd) {
5432                                 /*
5433                                  * If sending an ABORT in case of an
5434                                  * additional address, don't use the new
5435                                  * address error cause. This looks no
5436                                  * different than if no listener was
5437                                  * present.
5438                                  */
5439                                 *op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), "Address added");
5440                                 return (true);
5441                         }
5442                 }
5443                 offset += SCTP_SIZE32(plen);
5444                 if (offset >= limit) {
5445                         break;
5446                 }
5447                 phdr = sctp_get_next_param(in_initpkt, offset, &params, sizeof(params));
5448         }
5449         return (false);
5450 }
5451
5452 /*
5453  * Given a MBUF chain that was sent into us containing an INIT. Build a
5454  * INIT-ACK with COOKIE and send back. We assume that the in_initpkt has done
5455  * a pullup to include IPv6/4header, SCTP header and initial part of INIT
5456  * message (i.e. the struct sctp_init_msg).
5457  */
5458 void
5459 sctp_send_initiate_ack(struct sctp_inpcb *inp, struct sctp_tcb *stcb,
5460     struct sctp_nets *src_net, struct mbuf *init_pkt,
5461     int iphlen, int offset,
5462     struct sockaddr *src, struct sockaddr *dst,
5463     struct sctphdr *sh, struct sctp_init_chunk *init_chk,
5464     uint8_t mflowtype, uint32_t mflowid,
5465     uint32_t vrf_id, uint16_t port)
5466 {
5467         struct sctp_association *asoc;
5468         struct mbuf *m, *m_tmp, *m_last, *m_cookie, *op_err;
5469         struct sctp_init_ack_chunk *initack;
5470         struct sctp_adaptation_layer_indication *ali;
5471         struct sctp_supported_chunk_types_param *pr_supported;
5472         struct sctp_paramhdr *ph;
5473         union sctp_sockstore *over_addr;
5474         struct sctp_scoping scp;
5475         struct timeval now;
5476 #ifdef INET
5477         struct sockaddr_in *dst4 = (struct sockaddr_in *)dst;
5478         struct sockaddr_in *src4 = (struct sockaddr_in *)src;
5479         struct sockaddr_in *sin;
5480 #endif
5481 #ifdef INET6
5482         struct sockaddr_in6 *dst6 = (struct sockaddr_in6 *)dst;
5483         struct sockaddr_in6 *src6 = (struct sockaddr_in6 *)src;
5484         struct sockaddr_in6 *sin6;
5485 #endif
5486         struct sockaddr *to;
5487         struct sctp_state_cookie stc;
5488         struct sctp_nets *net = NULL;
5489         uint8_t *signature = NULL;
5490         int cnt_inits_to = 0;
5491         uint16_t his_limit, i_want;
5492         int abort_flag;
5493         int nat_friendly = 0;
5494         int error;
5495         struct socket *so;
5496         uint16_t num_ext, chunk_len, padding_len, parameter_len;
5497
5498         if (stcb) {
5499                 asoc = &stcb->asoc;
5500         } else {
5501                 asoc = NULL;
5502         }
5503         if ((asoc != NULL) &&
5504             (SCTP_GET_STATE(stcb) != SCTP_STATE_COOKIE_WAIT)) {
5505                 if (sctp_are_there_new_addresses(asoc, init_pkt, offset, offset + ntohs(init_chk->ch.chunk_length), src, &op_err)) {
5506                         /*
5507                          * new addresses, out of here in non-cookie-wait
5508                          * states
5509                          */
5510                         sctp_send_abort(init_pkt, iphlen, src, dst, sh, 0, op_err,
5511                             mflowtype, mflowid, inp->fibnum,
5512                             vrf_id, port);
5513                         return;
5514                 }
5515                 if (src_net != NULL && (src_net->port != port)) {
5516                         /*
5517                          * change of remote encapsulation port, out of here
5518                          * in non-cookie-wait states
5519                          *
5520                          * Send an ABORT, without an specific error cause.
5521                          * This looks no different than if no listener was
5522                          * present.
5523                          */
5524                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
5525                             "Remote encapsulation port changed");
5526                         sctp_send_abort(init_pkt, iphlen, src, dst, sh, 0, op_err,
5527                             mflowtype, mflowid, inp->fibnum,
5528                             vrf_id, port);
5529                         return;
5530                 }
5531         }
5532         abort_flag = 0;
5533         op_err = sctp_arethere_unrecognized_parameters(init_pkt,
5534             (offset + sizeof(struct sctp_init_chunk)),
5535             &abort_flag,
5536             (struct sctp_chunkhdr *)init_chk,
5537             &nat_friendly, NULL);
5538         if (abort_flag) {
5539 do_a_abort:
5540                 if (op_err == NULL) {
5541                         char msg[SCTP_DIAG_INFO_LEN];
5542
5543                         SCTP_SNPRINTF(msg, sizeof(msg), "%s:%d at %s", __FILE__, __LINE__, __func__);
5544                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
5545                             msg);
5546                 }
5547                 sctp_send_abort(init_pkt, iphlen, src, dst, sh,
5548                     init_chk->init.initiate_tag, op_err,
5549                     mflowtype, mflowid, inp->fibnum,
5550                     vrf_id, port);
5551                 return;
5552         }
5553         m = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
5554         if (m == NULL) {
5555                 /* No memory, INIT timer will re-attempt. */
5556                 sctp_m_freem(op_err);
5557                 return;
5558         }
5559         chunk_len = (uint16_t)sizeof(struct sctp_init_ack_chunk);
5560         padding_len = 0;
5561
5562         /*
5563          * We might not overwrite the identification[] completely and on
5564          * some platforms time_entered will contain some padding. Therefore
5565          * zero out the cookie to avoid putting uninitialized memory on the
5566          * wire.
5567          */
5568         memset(&stc, 0, sizeof(struct sctp_state_cookie));
5569
5570         /* the time I built cookie */
5571         (void)SCTP_GETTIME_TIMEVAL(&now);
5572         stc.time_entered.tv_sec = now.tv_sec;
5573         stc.time_entered.tv_usec = now.tv_usec;
5574
5575         /* populate any tie tags */
5576         if (asoc != NULL) {
5577                 /* unlock before tag selections */
5578                 stc.tie_tag_my_vtag = asoc->my_vtag_nonce;
5579                 stc.tie_tag_peer_vtag = asoc->peer_vtag_nonce;
5580                 stc.cookie_life = asoc->cookie_life;
5581                 net = asoc->primary_destination;
5582         } else {
5583                 stc.tie_tag_my_vtag = 0;
5584                 stc.tie_tag_peer_vtag = 0;
5585                 /* life I will award this cookie */
5586                 stc.cookie_life = inp->sctp_ep.def_cookie_life;
5587         }
5588
5589         /* copy in the ports for later check */
5590         stc.myport = sh->dest_port;
5591         stc.peerport = sh->src_port;
5592
5593         /*
5594          * If we wanted to honor cookie life extensions, we would add to
5595          * stc.cookie_life. For now we should NOT honor any extension
5596          */
5597         stc.site_scope = stc.local_scope = stc.loopback_scope = 0;
5598         if (inp->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
5599                 stc.ipv6_addr_legal = 1;
5600                 if (SCTP_IPV6_V6ONLY(inp)) {
5601                         stc.ipv4_addr_legal = 0;
5602                 } else {
5603                         stc.ipv4_addr_legal = 1;
5604                 }
5605         } else {
5606                 stc.ipv6_addr_legal = 0;
5607                 stc.ipv4_addr_legal = 1;
5608         }
5609         stc.ipv4_scope = 0;
5610         if (net == NULL) {
5611                 to = src;
5612                 switch (dst->sa_family) {
5613 #ifdef INET
5614                 case AF_INET:
5615                         {
5616                                 /* lookup address */
5617                                 stc.address[0] = src4->sin_addr.s_addr;
5618                                 stc.address[1] = 0;
5619                                 stc.address[2] = 0;
5620                                 stc.address[3] = 0;
5621                                 stc.addr_type = SCTP_IPV4_ADDRESS;
5622                                 /* local from address */
5623                                 stc.laddress[0] = dst4->sin_addr.s_addr;
5624                                 stc.laddress[1] = 0;
5625                                 stc.laddress[2] = 0;
5626                                 stc.laddress[3] = 0;
5627                                 stc.laddr_type = SCTP_IPV4_ADDRESS;
5628                                 /* scope_id is only for v6 */
5629                                 stc.scope_id = 0;
5630                                 if ((IN4_ISPRIVATE_ADDRESS(&src4->sin_addr)) ||
5631                                     (IN4_ISPRIVATE_ADDRESS(&dst4->sin_addr))) {
5632                                         stc.ipv4_scope = 1;
5633                                 }
5634                                 /* Must use the address in this case */
5635                                 if (sctp_is_address_on_local_host(src, vrf_id)) {
5636                                         stc.loopback_scope = 1;
5637                                         stc.ipv4_scope = 1;
5638                                         stc.site_scope = 1;
5639                                         stc.local_scope = 0;
5640                                 }
5641                                 break;
5642                         }
5643 #endif
5644 #ifdef INET6
5645                 case AF_INET6:
5646                         {
5647                                 stc.addr_type = SCTP_IPV6_ADDRESS;
5648                                 memcpy(&stc.address, &src6->sin6_addr, sizeof(struct in6_addr));
5649                                 stc.scope_id = ntohs(in6_getscope(&src6->sin6_addr));
5650                                 if (sctp_is_address_on_local_host(src, vrf_id)) {
5651                                         stc.loopback_scope = 1;
5652                                         stc.local_scope = 0;
5653                                         stc.site_scope = 1;
5654                                         stc.ipv4_scope = 1;
5655                                 } else if (IN6_IS_ADDR_LINKLOCAL(&src6->sin6_addr) ||
5656                                     IN6_IS_ADDR_LINKLOCAL(&dst6->sin6_addr)) {
5657                                         /*
5658                                          * If the new destination or source
5659                                          * is a LINK_LOCAL we must have
5660                                          * common both site and local scope.
5661                                          * Don't set local scope though
5662                                          * since we must depend on the
5663                                          * source to be added implicitly. We
5664                                          * cannot assure just because we
5665                                          * share one link that all links are
5666                                          * common.
5667                                          */
5668                                         stc.local_scope = 0;
5669                                         stc.site_scope = 1;
5670                                         stc.ipv4_scope = 1;
5671                                         /*
5672                                          * we start counting for the private
5673                                          * address stuff at 1. since the
5674                                          * link local we source from won't
5675                                          * show up in our scoped count.
5676                                          */
5677                                         cnt_inits_to = 1;
5678                                         /*
5679                                          * pull out the scope_id from
5680                                          * incoming pkt
5681                                          */
5682                                 } else if (IN6_IS_ADDR_SITELOCAL(&src6->sin6_addr) ||
5683                                     IN6_IS_ADDR_SITELOCAL(&dst6->sin6_addr)) {
5684                                         /*
5685                                          * If the new destination or source
5686                                          * is SITE_LOCAL then we must have
5687                                          * site scope in common.
5688                                          */
5689                                         stc.site_scope = 1;
5690                                 }
5691                                 memcpy(&stc.laddress, &dst6->sin6_addr, sizeof(struct in6_addr));
5692                                 stc.laddr_type = SCTP_IPV6_ADDRESS;
5693                                 break;
5694                         }
5695 #endif
5696                 default:
5697                         /* TSNH */
5698                         goto do_a_abort;
5699                         break;
5700                 }
5701         } else {
5702                 /* set the scope per the existing tcb */
5703
5704 #ifdef INET6
5705                 struct sctp_nets *lnet;
5706 #endif
5707
5708                 stc.loopback_scope = asoc->scope.loopback_scope;
5709                 stc.ipv4_scope = asoc->scope.ipv4_local_scope;
5710                 stc.site_scope = asoc->scope.site_scope;
5711                 stc.local_scope = asoc->scope.local_scope;
5712 #ifdef INET6
5713                 /* Why do we not consider IPv4 LL addresses? */
5714                 TAILQ_FOREACH(lnet, &asoc->nets, sctp_next) {
5715                         if (lnet->ro._l_addr.sin6.sin6_family == AF_INET6) {
5716                                 if (IN6_IS_ADDR_LINKLOCAL(&lnet->ro._l_addr.sin6.sin6_addr)) {
5717                                         /*
5718                                          * if we have a LL address, start
5719                                          * counting at 1.
5720                                          */
5721                                         cnt_inits_to = 1;
5722                                 }
5723                         }
5724                 }
5725 #endif
5726                 /* use the net pointer */
5727                 to = (struct sockaddr *)&net->ro._l_addr;
5728                 switch (to->sa_family) {
5729 #ifdef INET
5730                 case AF_INET:
5731                         sin = (struct sockaddr_in *)to;
5732                         stc.address[0] = sin->sin_addr.s_addr;
5733                         stc.address[1] = 0;
5734                         stc.address[2] = 0;
5735                         stc.address[3] = 0;
5736                         stc.addr_type = SCTP_IPV4_ADDRESS;
5737                         if (net->src_addr_selected == 0) {
5738                                 /*
5739                                  * strange case here, the INIT should have
5740                                  * did the selection.
5741                                  */
5742                                 net->ro._s_addr = sctp_source_address_selection(inp,
5743                                     stcb, (sctp_route_t *)&net->ro,
5744                                     net, 0, vrf_id);
5745                                 if (net->ro._s_addr == NULL) {
5746                                         sctp_m_freem(op_err);
5747                                         sctp_m_freem(m);
5748                                         return;
5749                                 }
5750
5751                                 net->src_addr_selected = 1;
5752                         }
5753                         stc.laddress[0] = net->ro._s_addr->address.sin.sin_addr.s_addr;
5754                         stc.laddress[1] = 0;
5755                         stc.laddress[2] = 0;
5756                         stc.laddress[3] = 0;
5757                         stc.laddr_type = SCTP_IPV4_ADDRESS;
5758                         /* scope_id is only for v6 */
5759                         stc.scope_id = 0;
5760                         break;
5761 #endif
5762 #ifdef INET6
5763                 case AF_INET6:
5764                         sin6 = (struct sockaddr_in6 *)to;
5765                         memcpy(&stc.address, &sin6->sin6_addr,
5766                             sizeof(struct in6_addr));
5767                         stc.addr_type = SCTP_IPV6_ADDRESS;
5768                         stc.scope_id = sin6->sin6_scope_id;
5769                         if (net->src_addr_selected == 0) {
5770                                 /*
5771                                  * strange case here, the INIT should have
5772                                  * done the selection.
5773                                  */
5774                                 net->ro._s_addr = sctp_source_address_selection(inp,
5775                                     stcb, (sctp_route_t *)&net->ro,
5776                                     net, 0, vrf_id);
5777                                 if (net->ro._s_addr == NULL) {
5778                                         sctp_m_freem(op_err);
5779                                         sctp_m_freem(m);
5780                                         return;
5781                                 }
5782
5783                                 net->src_addr_selected = 1;
5784                         }
5785                         memcpy(&stc.laddress, &net->ro._s_addr->address.sin6.sin6_addr,
5786                             sizeof(struct in6_addr));
5787                         stc.laddr_type = SCTP_IPV6_ADDRESS;
5788                         break;
5789 #endif
5790                 }
5791         }
5792         /* Now lets put the SCTP header in place */
5793         initack = mtod(m, struct sctp_init_ack_chunk *);
5794         /* Save it off for quick ref */
5795         stc.peers_vtag = ntohl(init_chk->init.initiate_tag);
5796         /* who are we */
5797         memcpy(stc.identification, SCTP_VERSION_STRING,
5798             min(strlen(SCTP_VERSION_STRING), sizeof(stc.identification)));
5799         memset(stc.reserved, 0, SCTP_RESERVE_SPACE);
5800         /* now the chunk header */
5801         initack->ch.chunk_type = SCTP_INITIATION_ACK;
5802         initack->ch.chunk_flags = 0;
5803         /* fill in later from mbuf we build */
5804         initack->ch.chunk_length = 0;
5805         /* place in my tag */
5806         if ((asoc != NULL) &&
5807             ((SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_WAIT) ||
5808             (SCTP_GET_STATE(stcb) == SCTP_STATE_INUSE) ||
5809             (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED))) {
5810                 /* re-use the v-tags and init-seq here */
5811                 initack->init.initiate_tag = htonl(asoc->my_vtag);
5812                 initack->init.initial_tsn = htonl(asoc->init_seq_number);
5813         } else {
5814                 uint32_t vtag, itsn;
5815
5816                 if (asoc) {
5817                         atomic_add_int(&asoc->refcnt, 1);
5818                         SCTP_TCB_UNLOCK(stcb);
5819         new_tag:
5820                         SCTP_INP_INFO_RLOCK();
5821                         vtag = sctp_select_a_tag(inp, inp->sctp_lport, sh->src_port, 1);
5822                         SCTP_INP_INFO_RUNLOCK();
5823                         if ((asoc->peer_supports_nat) && (vtag == asoc->my_vtag)) {
5824                                 /*
5825                                  * Got a duplicate vtag on some guy behind a
5826                                  * nat make sure we don't use it.
5827                                  */
5828                                 goto new_tag;
5829                         }
5830                         initack->init.initiate_tag = htonl(vtag);
5831                         /* get a TSN to use too */
5832                         itsn = sctp_select_initial_TSN(&inp->sctp_ep);
5833                         initack->init.initial_tsn = htonl(itsn);
5834                         SCTP_TCB_LOCK(stcb);
5835                         atomic_add_int(&asoc->refcnt, -1);
5836                 } else {
5837                         SCTP_INP_INCR_REF(inp);
5838                         SCTP_INP_RUNLOCK(inp);
5839                         SCTP_INP_INFO_RLOCK();
5840                         vtag = sctp_select_a_tag(inp, inp->sctp_lport, sh->src_port, 1);
5841                         SCTP_INP_INFO_RUNLOCK();
5842                         initack->init.initiate_tag = htonl(vtag);
5843                         /* get a TSN to use too */
5844                         initack->init.initial_tsn = htonl(sctp_select_initial_TSN(&inp->sctp_ep));
5845                         SCTP_INP_RLOCK(inp);
5846                         SCTP_INP_DECR_REF(inp);
5847                 }
5848         }
5849         /* save away my tag to */
5850         stc.my_vtag = initack->init.initiate_tag;
5851
5852         /* set up some of the credits. */
5853         so = inp->sctp_socket;
5854         if (so == NULL) {
5855                 /* memory problem */
5856                 sctp_m_freem(op_err);
5857                 sctp_m_freem(m);
5858                 return;
5859         } else {
5860                 initack->init.a_rwnd = htonl(max(SCTP_SB_LIMIT_RCV(so), SCTP_MINIMAL_RWND));
5861         }
5862         /* set what I want */
5863         his_limit = ntohs(init_chk->init.num_inbound_streams);
5864         /* choose what I want */
5865         if (asoc != NULL) {
5866                 if (asoc->streamoutcnt > asoc->pre_open_streams) {
5867                         i_want = asoc->streamoutcnt;
5868                 } else {
5869                         i_want = asoc->pre_open_streams;
5870                 }
5871         } else {
5872                 i_want = inp->sctp_ep.pre_open_stream_count;
5873         }
5874         if (his_limit < i_want) {
5875                 /* I Want more :< */
5876                 initack->init.num_outbound_streams = init_chk->init.num_inbound_streams;
5877         } else {
5878                 /* I can have what I want :> */
5879                 initack->init.num_outbound_streams = htons(i_want);
5880         }
5881         /* tell him his limit. */
5882         initack->init.num_inbound_streams =
5883             htons(inp->sctp_ep.max_open_streams_intome);
5884
5885         /* adaptation layer indication parameter */
5886         if (inp->sctp_ep.adaptation_layer_indicator_provided) {
5887                 parameter_len = (uint16_t)sizeof(struct sctp_adaptation_layer_indication);
5888                 ali = (struct sctp_adaptation_layer_indication *)(mtod(m, caddr_t)+chunk_len);
5889                 ali->ph.param_type = htons(SCTP_ULP_ADAPTATION);
5890                 ali->ph.param_length = htons(parameter_len);
5891                 ali->indication = htonl(inp->sctp_ep.adaptation_layer_indicator);
5892                 chunk_len += parameter_len;
5893         }
5894
5895         /* ECN parameter */
5896         if (((asoc != NULL) && (asoc->ecn_supported == 1)) ||
5897             ((asoc == NULL) && (inp->ecn_supported == 1))) {
5898                 parameter_len = (uint16_t)sizeof(struct sctp_paramhdr);
5899                 ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
5900                 ph->param_type = htons(SCTP_ECN_CAPABLE);
5901                 ph->param_length = htons(parameter_len);
5902                 chunk_len += parameter_len;
5903         }
5904
5905         /* PR-SCTP supported parameter */
5906         if (((asoc != NULL) && (asoc->prsctp_supported == 1)) ||
5907             ((asoc == NULL) && (inp->prsctp_supported == 1))) {
5908                 parameter_len = (uint16_t)sizeof(struct sctp_paramhdr);
5909                 ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
5910                 ph->param_type = htons(SCTP_PRSCTP_SUPPORTED);
5911                 ph->param_length = htons(parameter_len);
5912                 chunk_len += parameter_len;
5913         }
5914
5915         /* Add NAT friendly parameter */
5916         if (nat_friendly) {
5917                 parameter_len = (uint16_t)sizeof(struct sctp_paramhdr);
5918                 ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
5919                 ph->param_type = htons(SCTP_HAS_NAT_SUPPORT);
5920                 ph->param_length = htons(parameter_len);
5921                 chunk_len += parameter_len;
5922         }
5923
5924         /* And now tell the peer which extensions we support */
5925         num_ext = 0;
5926         pr_supported = (struct sctp_supported_chunk_types_param *)(mtod(m, caddr_t)+chunk_len);
5927         if (((asoc != NULL) && (asoc->prsctp_supported == 1)) ||
5928             ((asoc == NULL) && (inp->prsctp_supported == 1))) {
5929                 pr_supported->chunk_types[num_ext++] = SCTP_FORWARD_CUM_TSN;
5930                 if (((asoc != NULL) && (asoc->idata_supported == 1)) ||
5931                     ((asoc == NULL) && (inp->idata_supported == 1))) {
5932                         pr_supported->chunk_types[num_ext++] = SCTP_IFORWARD_CUM_TSN;
5933                 }
5934         }
5935         if (((asoc != NULL) && (asoc->auth_supported == 1)) ||
5936             ((asoc == NULL) && (inp->auth_supported == 1))) {
5937                 pr_supported->chunk_types[num_ext++] = SCTP_AUTHENTICATION;
5938         }
5939         if (((asoc != NULL) && (asoc->asconf_supported == 1)) ||
5940             ((asoc == NULL) && (inp->asconf_supported == 1))) {
5941                 pr_supported->chunk_types[num_ext++] = SCTP_ASCONF;
5942                 pr_supported->chunk_types[num_ext++] = SCTP_ASCONF_ACK;
5943         }
5944         if (((asoc != NULL) && (asoc->reconfig_supported == 1)) ||
5945             ((asoc == NULL) && (inp->reconfig_supported == 1))) {
5946                 pr_supported->chunk_types[num_ext++] = SCTP_STREAM_RESET;
5947         }
5948         if (((asoc != NULL) && (asoc->idata_supported == 1)) ||
5949             ((asoc == NULL) && (inp->idata_supported == 1))) {
5950                 pr_supported->chunk_types[num_ext++] = SCTP_IDATA;
5951         }
5952         if (((asoc != NULL) && (asoc->nrsack_supported == 1)) ||
5953             ((asoc == NULL) && (inp->nrsack_supported == 1))) {
5954                 pr_supported->chunk_types[num_ext++] = SCTP_NR_SELECTIVE_ACK;
5955         }
5956         if (((asoc != NULL) && (asoc->pktdrop_supported == 1)) ||
5957             ((asoc == NULL) && (inp->pktdrop_supported == 1))) {
5958                 pr_supported->chunk_types[num_ext++] = SCTP_PACKET_DROPPED;
5959         }
5960         if (num_ext > 0) {
5961                 parameter_len = (uint16_t)sizeof(struct sctp_supported_chunk_types_param) + num_ext;
5962                 pr_supported->ph.param_type = htons(SCTP_SUPPORTED_CHUNK_EXT);
5963                 pr_supported->ph.param_length = htons(parameter_len);
5964                 padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
5965                 chunk_len += parameter_len;
5966         }
5967
5968         /* add authentication parameters */
5969         if (((asoc != NULL) && (asoc->auth_supported == 1)) ||
5970             ((asoc == NULL) && (inp->auth_supported == 1))) {
5971                 struct sctp_auth_random *randp;
5972                 struct sctp_auth_hmac_algo *hmacs;
5973                 struct sctp_auth_chunk_list *chunks;
5974
5975                 if (padding_len > 0) {
5976                         memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
5977                         chunk_len += padding_len;
5978                         padding_len = 0;
5979                 }
5980                 /* generate and add RANDOM parameter */
5981                 randp = (struct sctp_auth_random *)(mtod(m, caddr_t)+chunk_len);
5982                 parameter_len = (uint16_t)sizeof(struct sctp_auth_random) +
5983                     SCTP_AUTH_RANDOM_SIZE_DEFAULT;
5984                 randp->ph.param_type = htons(SCTP_RANDOM);
5985                 randp->ph.param_length = htons(parameter_len);
5986                 SCTP_READ_RANDOM(randp->random_data, SCTP_AUTH_RANDOM_SIZE_DEFAULT);
5987                 padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
5988                 chunk_len += parameter_len;
5989
5990                 if (padding_len > 0) {
5991                         memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
5992                         chunk_len += padding_len;
5993                         padding_len = 0;
5994                 }
5995                 /* add HMAC_ALGO parameter */
5996                 hmacs = (struct sctp_auth_hmac_algo *)(mtod(m, caddr_t)+chunk_len);
5997                 parameter_len = (uint16_t)sizeof(struct sctp_auth_hmac_algo) +
5998                     sctp_serialize_hmaclist(inp->sctp_ep.local_hmacs,
5999                     (uint8_t *)hmacs->hmac_ids);
6000                 hmacs->ph.param_type = htons(SCTP_HMAC_LIST);
6001                 hmacs->ph.param_length = htons(parameter_len);
6002                 padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
6003                 chunk_len += parameter_len;
6004
6005                 if (padding_len > 0) {
6006                         memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
6007                         chunk_len += padding_len;
6008                         padding_len = 0;
6009                 }
6010                 /* add CHUNKS parameter */
6011                 chunks = (struct sctp_auth_chunk_list *)(mtod(m, caddr_t)+chunk_len);
6012                 parameter_len = (uint16_t)sizeof(struct sctp_auth_chunk_list) +
6013                     sctp_serialize_auth_chunks(inp->sctp_ep.local_auth_chunks,
6014                     chunks->chunk_types);
6015                 chunks->ph.param_type = htons(SCTP_CHUNK_LIST);
6016                 chunks->ph.param_length = htons(parameter_len);
6017                 padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
6018                 chunk_len += parameter_len;
6019         }
6020         SCTP_BUF_LEN(m) = chunk_len;
6021         m_last = m;
6022         /* now the addresses */
6023         /*
6024          * To optimize this we could put the scoping stuff into a structure
6025          * and remove the individual uint8's from the stc structure. Then we
6026          * could just sifa in the address within the stc.. but for now this
6027          * is a quick hack to get the address stuff teased apart.
6028          */
6029         scp.ipv4_addr_legal = stc.ipv4_addr_legal;
6030         scp.ipv6_addr_legal = stc.ipv6_addr_legal;
6031         scp.loopback_scope = stc.loopback_scope;
6032         scp.ipv4_local_scope = stc.ipv4_scope;
6033         scp.local_scope = stc.local_scope;
6034         scp.site_scope = stc.site_scope;
6035         m_last = sctp_add_addresses_to_i_ia(inp, stcb, &scp, m_last,
6036             cnt_inits_to,
6037             &padding_len, &chunk_len);
6038         /* padding_len can only be positive, if no addresses have been added */
6039         if (padding_len > 0) {
6040                 memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
6041                 chunk_len += padding_len;
6042                 SCTP_BUF_LEN(m) += padding_len;
6043                 padding_len = 0;
6044         }
6045
6046         /* tack on the operational error if present */
6047         if (op_err) {
6048                 parameter_len = 0;
6049                 for (m_tmp = op_err; m_tmp != NULL; m_tmp = SCTP_BUF_NEXT(m_tmp)) {
6050                         parameter_len += SCTP_BUF_LEN(m_tmp);
6051                 }
6052                 padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
6053                 SCTP_BUF_NEXT(m_last) = op_err;
6054                 while (SCTP_BUF_NEXT(m_last) != NULL) {
6055                         m_last = SCTP_BUF_NEXT(m_last);
6056                 }
6057                 chunk_len += parameter_len;
6058         }
6059         if (padding_len > 0) {
6060                 m_last = sctp_add_pad_tombuf(m_last, padding_len);
6061                 if (m_last == NULL) {
6062                         /* Houston we have a problem, no space */
6063                         sctp_m_freem(m);
6064                         return;
6065                 }
6066                 chunk_len += padding_len;
6067                 padding_len = 0;
6068         }
6069         /* Now we must build a cookie */
6070         m_cookie = sctp_add_cookie(init_pkt, offset, m, 0, &stc, &signature);
6071         if (m_cookie == NULL) {
6072                 /* memory problem */
6073                 sctp_m_freem(m);
6074                 return;
6075         }
6076         /* Now append the cookie to the end and update the space/size */
6077         SCTP_BUF_NEXT(m_last) = m_cookie;
6078         parameter_len = 0;
6079         for (m_tmp = m_cookie; m_tmp != NULL; m_tmp = SCTP_BUF_NEXT(m_tmp)) {
6080                 parameter_len += SCTP_BUF_LEN(m_tmp);
6081                 if (SCTP_BUF_NEXT(m_tmp) == NULL) {
6082                         m_last = m_tmp;
6083                 }
6084         }
6085         padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
6086         chunk_len += parameter_len;
6087
6088         /*
6089          * Place in the size, but we don't include the last pad (if any) in
6090          * the INIT-ACK.
6091          */
6092         initack->ch.chunk_length = htons(chunk_len);
6093
6094         /*
6095          * Time to sign the cookie, we don't sign over the cookie signature
6096          * though thus we set trailer.
6097          */
6098         (void)sctp_hmac_m(SCTP_HMAC,
6099             (uint8_t *)inp->sctp_ep.secret_key[(int)(inp->sctp_ep.current_secret_number)],
6100             SCTP_SECRET_SIZE, m_cookie, sizeof(struct sctp_paramhdr),
6101             (uint8_t *)signature, SCTP_SIGNATURE_SIZE);
6102         /*
6103          * We sifa 0 here to NOT set IP_DF if its IPv4, we ignore the return
6104          * here since the timer will drive a retranmission.
6105          */
6106         if (padding_len > 0) {
6107                 if (sctp_add_pad_tombuf(m_last, padding_len) == NULL) {
6108                         sctp_m_freem(m);
6109                         return;
6110                 }
6111         }
6112         if (stc.loopback_scope) {
6113                 over_addr = (union sctp_sockstore *)dst;
6114         } else {
6115                 over_addr = NULL;
6116         }
6117
6118         if ((error = sctp_lowlevel_chunk_output(inp, NULL, NULL, to, m, 0, NULL, 0, 0,
6119             0, 0,
6120             inp->sctp_lport, sh->src_port, init_chk->init.initiate_tag,
6121             port, over_addr,
6122             mflowtype, mflowid,
6123             SCTP_SO_NOT_LOCKED))) {
6124                 SCTPDBG(SCTP_DEBUG_OUTPUT4, "Gak send error %d\n", error);
6125                 if (error == ENOBUFS) {
6126                         if (asoc != NULL) {
6127                                 asoc->ifp_had_enobuf = 1;
6128                         }
6129                         SCTP_STAT_INCR(sctps_lowlevelerr);
6130                 }
6131         } else {
6132                 if (asoc != NULL) {
6133                         asoc->ifp_had_enobuf = 0;
6134                 }
6135         }
6136         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
6137 }
6138
6139 static void
6140 sctp_prune_prsctp(struct sctp_tcb *stcb,
6141     struct sctp_association *asoc,
6142     struct sctp_sndrcvinfo *srcv,
6143     int dataout)
6144 {
6145         int freed_spc = 0;
6146         struct sctp_tmit_chunk *chk, *nchk;
6147
6148         SCTP_TCB_LOCK_ASSERT(stcb);
6149         if ((asoc->prsctp_supported) &&
6150             (asoc->sent_queue_cnt_removeable > 0)) {
6151                 TAILQ_FOREACH(chk, &asoc->sent_queue, sctp_next) {
6152                         /*
6153                          * Look for chunks marked with the PR_SCTP flag AND
6154                          * the buffer space flag. If the one being sent is
6155                          * equal or greater priority then purge the old one
6156                          * and free some space.
6157                          */
6158                         if (PR_SCTP_BUF_ENABLED(chk->flags)) {
6159                                 /*
6160                                  * This one is PR-SCTP AND buffer space
6161                                  * limited type
6162                                  */
6163                                 if (chk->rec.data.timetodrop.tv_sec > (long)srcv->sinfo_timetolive) {
6164                                         /*
6165                                          * Lower numbers equates to higher
6166                                          * priority. So if the one we are
6167                                          * looking at has a larger priority,
6168                                          * we want to drop the data and NOT
6169                                          * retransmit it.
6170                                          */
6171                                         if (chk->data) {
6172                                                 /*
6173                                                  * We release the book_size
6174                                                  * if the mbuf is here
6175                                                  */
6176                                                 int ret_spc;
6177                                                 uint8_t sent;
6178
6179                                                 if (chk->sent > SCTP_DATAGRAM_UNSENT)
6180                                                         sent = 1;
6181                                                 else
6182                                                         sent = 0;
6183                                                 ret_spc = sctp_release_pr_sctp_chunk(stcb, chk,
6184                                                     sent,
6185                                                     SCTP_SO_LOCKED);
6186                                                 freed_spc += ret_spc;
6187                                                 if (freed_spc >= dataout) {
6188                                                         return;
6189                                                 }
6190                                         }       /* if chunk was present */
6191                                 }       /* if of sufficient priority */
6192                         }       /* if chunk has enabled */
6193                 }               /* tailqforeach */
6194
6195                 TAILQ_FOREACH_SAFE(chk, &asoc->send_queue, sctp_next, nchk) {
6196                         /* Here we must move to the sent queue and mark */
6197                         if (PR_SCTP_BUF_ENABLED(chk->flags)) {
6198                                 if (chk->rec.data.timetodrop.tv_sec > (long)srcv->sinfo_timetolive) {
6199                                         if (chk->data) {
6200                                                 /*
6201                                                  * We release the book_size
6202                                                  * if the mbuf is here
6203                                                  */
6204                                                 int ret_spc;
6205
6206                                                 ret_spc = sctp_release_pr_sctp_chunk(stcb, chk,
6207                                                     0, SCTP_SO_LOCKED);
6208
6209                                                 freed_spc += ret_spc;
6210                                                 if (freed_spc >= dataout) {
6211                                                         return;
6212                                                 }
6213                                         }       /* end if chk->data */
6214                                 }       /* end if right class */
6215                         }       /* end if chk pr-sctp */
6216                 }               /* tailqforeachsafe (chk) */
6217         }                       /* if enabled in asoc */
6218 }
6219
6220 int
6221 sctp_get_frag_point(struct sctp_tcb *stcb,
6222     struct sctp_association *asoc)
6223 {
6224         int siz, ovh;
6225
6226         /*
6227          * For endpoints that have both v6 and v4 addresses we must reserve
6228          * room for the ipv6 header, for those that are only dealing with V4
6229          * we use a larger frag point.
6230          */
6231         if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
6232                 ovh = SCTP_MIN_OVERHEAD;
6233         } else {
6234                 ovh = SCTP_MIN_V4_OVERHEAD;
6235         }
6236         ovh += SCTP_DATA_CHUNK_OVERHEAD(stcb);
6237         if (stcb->asoc.sctp_frag_point > asoc->smallest_mtu)
6238                 siz = asoc->smallest_mtu - ovh;
6239         else
6240                 siz = (stcb->asoc.sctp_frag_point - ovh);
6241         /*
6242          * if (siz > (MCLBYTES-sizeof(struct sctp_data_chunk))) {
6243          */
6244         /* A data chunk MUST fit in a cluster */
6245         /* siz = (MCLBYTES - sizeof(struct sctp_data_chunk)); */
6246         /* } */
6247
6248         /* adjust for an AUTH chunk if DATA requires auth */
6249         if (sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks))
6250                 siz -= sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
6251
6252         if (siz % 4) {
6253                 /* make it an even word boundary please */
6254                 siz -= (siz % 4);
6255         }
6256         return (siz);
6257 }
6258
6259 static void
6260 sctp_set_prsctp_policy(struct sctp_stream_queue_pending *sp)
6261 {
6262         /*
6263          * We assume that the user wants PR_SCTP_TTL if the user provides a
6264          * positive lifetime but does not specify any PR_SCTP policy.
6265          */
6266         if (PR_SCTP_ENABLED(sp->sinfo_flags)) {
6267                 sp->act_flags |= PR_SCTP_POLICY(sp->sinfo_flags);
6268         } else if (sp->timetolive > 0) {
6269                 sp->sinfo_flags |= SCTP_PR_SCTP_TTL;
6270                 sp->act_flags |= PR_SCTP_POLICY(sp->sinfo_flags);
6271         } else {
6272                 return;
6273         }
6274         switch (PR_SCTP_POLICY(sp->sinfo_flags)) {
6275         case CHUNK_FLAGS_PR_SCTP_BUF:
6276                 /*
6277                  * Time to live is a priority stored in tv_sec when doing
6278                  * the buffer drop thing.
6279                  */
6280                 sp->ts.tv_sec = sp->timetolive;
6281                 sp->ts.tv_usec = 0;
6282                 break;
6283         case CHUNK_FLAGS_PR_SCTP_TTL:
6284                 {
6285                         struct timeval tv;
6286
6287                         (void)SCTP_GETTIME_TIMEVAL(&sp->ts);
6288                         tv.tv_sec = sp->timetolive / 1000;
6289                         tv.tv_usec = (sp->timetolive * 1000) % 1000000;
6290                         /*
6291                          * TODO sctp_constants.h needs alternative time
6292                          * macros when _KERNEL is undefined.
6293                          */
6294                         timevaladd(&sp->ts, &tv);
6295                 }
6296                 break;
6297         case CHUNK_FLAGS_PR_SCTP_RTX:
6298                 /*
6299                  * Time to live is a the number or retransmissions stored in
6300                  * tv_sec.
6301                  */
6302                 sp->ts.tv_sec = sp->timetolive;
6303                 sp->ts.tv_usec = 0;
6304                 break;
6305         default:
6306                 SCTPDBG(SCTP_DEBUG_USRREQ1,
6307                     "Unknown PR_SCTP policy %u.\n",
6308                     PR_SCTP_POLICY(sp->sinfo_flags));
6309                 break;
6310         }
6311 }
6312
6313 static int
6314 sctp_msg_append(struct sctp_tcb *stcb,
6315     struct sctp_nets *net,
6316     struct mbuf *m,
6317     struct sctp_sndrcvinfo *srcv, int hold_stcb_lock)
6318 {
6319         int error = 0;
6320         struct mbuf *at;
6321         struct sctp_stream_queue_pending *sp = NULL;
6322         struct sctp_stream_out *strm;
6323
6324         /*
6325          * Given an mbuf chain, put it into the association send queue and
6326          * place it on the wheel
6327          */
6328         if (srcv->sinfo_stream >= stcb->asoc.streamoutcnt) {
6329                 /* Invalid stream number */
6330                 SCTP_LTRACE_ERR_RET_PKT(m, NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
6331                 error = EINVAL;
6332                 goto out_now;
6333         }
6334         if ((stcb->asoc.stream_locked) &&
6335             (stcb->asoc.stream_locked_on != srcv->sinfo_stream)) {
6336                 SCTP_LTRACE_ERR_RET_PKT(m, NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
6337                 error = EINVAL;
6338                 goto out_now;
6339         }
6340         /* Now can we send this? */
6341         if ((SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_SENT) ||
6342             (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_ACK_SENT) ||
6343             (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_RECEIVED) ||
6344             (stcb->asoc.state & SCTP_STATE_SHUTDOWN_PENDING)) {
6345                 /* got data while shutting down */
6346                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
6347                 error = ECONNRESET;
6348                 goto out_now;
6349         }
6350         sctp_alloc_a_strmoq(stcb, sp);
6351         if (sp == NULL) {
6352                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
6353                 error = ENOMEM;
6354                 goto out_now;
6355         }
6356         sp->sinfo_flags = srcv->sinfo_flags;
6357         sp->timetolive = srcv->sinfo_timetolive;
6358         sp->ppid = srcv->sinfo_ppid;
6359         sp->context = srcv->sinfo_context;
6360         sp->fsn = 0;
6361         if (sp->sinfo_flags & SCTP_ADDR_OVER) {
6362                 sp->net = net;
6363                 atomic_add_int(&sp->net->ref_count, 1);
6364         } else {
6365                 sp->net = NULL;
6366         }
6367         (void)SCTP_GETTIME_TIMEVAL(&sp->ts);
6368         sp->sid = srcv->sinfo_stream;
6369         sp->msg_is_complete = 1;
6370         sp->sender_all_done = 1;
6371         sp->some_taken = 0;
6372         sp->data = m;
6373         sp->tail_mbuf = NULL;
6374         sctp_set_prsctp_policy(sp);
6375         /*
6376          * We could in theory (for sendall) sifa the length in, but we would
6377          * still have to hunt through the chain since we need to setup the
6378          * tail_mbuf
6379          */
6380         sp->length = 0;
6381         for (at = m; at; at = SCTP_BUF_NEXT(at)) {
6382                 if (SCTP_BUF_NEXT(at) == NULL)
6383                         sp->tail_mbuf = at;
6384                 sp->length += SCTP_BUF_LEN(at);
6385         }
6386         if (srcv->sinfo_keynumber_valid) {
6387                 sp->auth_keyid = srcv->sinfo_keynumber;
6388         } else {
6389                 sp->auth_keyid = stcb->asoc.authinfo.active_keyid;
6390         }
6391         if (sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks)) {
6392                 sctp_auth_key_acquire(stcb, sp->auth_keyid);
6393                 sp->holds_key_ref = 1;
6394         }
6395         if (hold_stcb_lock == 0) {
6396                 SCTP_TCB_SEND_LOCK(stcb);
6397         }
6398         strm = &stcb->asoc.strmout[srcv->sinfo_stream];
6399         sctp_snd_sb_alloc(stcb, sp->length);
6400         atomic_add_int(&stcb->asoc.stream_queue_cnt, 1);
6401         TAILQ_INSERT_TAIL(&strm->outqueue, sp, next);
6402         stcb->asoc.ss_functions.sctp_ss_add_to_stream(stcb, &stcb->asoc, strm, sp, 1);
6403         m = NULL;
6404         if (hold_stcb_lock == 0) {
6405                 SCTP_TCB_SEND_UNLOCK(stcb);
6406         }
6407 out_now:
6408         if (m) {
6409                 sctp_m_freem(m);
6410         }
6411         return (error);
6412 }
6413
6414 static struct mbuf *
6415 sctp_copy_mbufchain(struct mbuf *clonechain,
6416     struct mbuf *outchain,
6417     struct mbuf **endofchain,
6418     int can_take_mbuf,
6419     int sizeofcpy,
6420     uint8_t copy_by_ref)
6421 {
6422         struct mbuf *m;
6423         struct mbuf *appendchain;
6424         caddr_t cp;
6425         int len;
6426
6427         if (endofchain == NULL) {
6428                 /* error */
6429 error_out:
6430                 if (outchain)
6431                         sctp_m_freem(outchain);
6432                 return (NULL);
6433         }
6434         if (can_take_mbuf) {
6435                 appendchain = clonechain;
6436         } else {
6437                 if (!copy_by_ref &&
6438                     (sizeofcpy <= (int)((((SCTP_BASE_SYSCTL(sctp_mbuf_threshold_count) - 1) * MLEN) + MHLEN)))) {
6439                         /* Its not in a cluster */
6440                         if (*endofchain == NULL) {
6441                                 /* lets get a mbuf cluster */
6442                                 if (outchain == NULL) {
6443                                         /* This is the general case */
6444                         new_mbuf:
6445                                         outchain = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_HEADER);
6446                                         if (outchain == NULL) {
6447                                                 goto error_out;
6448                                         }
6449                                         SCTP_BUF_LEN(outchain) = 0;
6450                                         *endofchain = outchain;
6451                                         /* get the prepend space */
6452                                         SCTP_BUF_RESV_UF(outchain, (SCTP_FIRST_MBUF_RESV + 4));
6453                                 } else {
6454                                         /*
6455                                          * We really should not get a NULL
6456                                          * in endofchain
6457                                          */
6458                                         /* find end */
6459                                         m = outchain;
6460                                         while (m) {
6461                                                 if (SCTP_BUF_NEXT(m) == NULL) {
6462                                                         *endofchain = m;
6463                                                         break;
6464                                                 }
6465                                                 m = SCTP_BUF_NEXT(m);
6466                                         }
6467                                         /* sanity */
6468                                         if (*endofchain == NULL) {
6469                                                 /*
6470                                                  * huh, TSNH XXX maybe we
6471                                                  * should panic
6472                                                  */
6473                                                 sctp_m_freem(outchain);
6474                                                 goto new_mbuf;
6475                                         }
6476                                 }
6477                                 /* get the new end of length */
6478                                 len = (int)M_TRAILINGSPACE(*endofchain);
6479                         } else {
6480                                 /* how much is left at the end? */
6481                                 len = (int)M_TRAILINGSPACE(*endofchain);
6482                         }
6483                         /* Find the end of the data, for appending */
6484                         cp = (mtod((*endofchain), caddr_t)+SCTP_BUF_LEN((*endofchain)));
6485
6486                         /* Now lets copy it out */
6487                         if (len >= sizeofcpy) {
6488                                 /* It all fits, copy it in */
6489                                 m_copydata(clonechain, 0, sizeofcpy, cp);
6490                                 SCTP_BUF_LEN((*endofchain)) += sizeofcpy;
6491                         } else {
6492                                 /* fill up the end of the chain */
6493                                 if (len > 0) {
6494                                         m_copydata(clonechain, 0, len, cp);
6495                                         SCTP_BUF_LEN((*endofchain)) += len;
6496                                         /* now we need another one */
6497                                         sizeofcpy -= len;
6498                                 }
6499                                 m = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_HEADER);
6500                                 if (m == NULL) {
6501                                         /* We failed */
6502                                         goto error_out;
6503                                 }
6504                                 SCTP_BUF_NEXT((*endofchain)) = m;
6505                                 *endofchain = m;
6506                                 cp = mtod((*endofchain), caddr_t);
6507                                 m_copydata(clonechain, len, sizeofcpy, cp);
6508                                 SCTP_BUF_LEN((*endofchain)) += sizeofcpy;
6509                         }
6510                         return (outchain);
6511                 } else {
6512                         /* copy the old fashion way */
6513                         appendchain = SCTP_M_COPYM(clonechain, 0, M_COPYALL, M_NOWAIT);
6514 #ifdef SCTP_MBUF_LOGGING
6515                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
6516                                 sctp_log_mbc(appendchain, SCTP_MBUF_ICOPY);
6517                         }
6518 #endif
6519                 }
6520         }
6521         if (appendchain == NULL) {
6522                 /* error */
6523                 if (outchain)
6524                         sctp_m_freem(outchain);
6525                 return (NULL);
6526         }
6527         if (outchain) {
6528                 /* tack on to the end */
6529                 if (*endofchain != NULL) {
6530                         SCTP_BUF_NEXT(((*endofchain))) = appendchain;
6531                 } else {
6532                         m = outchain;
6533                         while (m) {
6534                                 if (SCTP_BUF_NEXT(m) == NULL) {
6535                                         SCTP_BUF_NEXT(m) = appendchain;
6536                                         break;
6537                                 }
6538                                 m = SCTP_BUF_NEXT(m);
6539                         }
6540                 }
6541                 /*
6542                  * save off the end and update the end-chain position
6543                  */
6544                 m = appendchain;
6545                 while (m) {
6546                         if (SCTP_BUF_NEXT(m) == NULL) {
6547                                 *endofchain = m;
6548                                 break;
6549                         }
6550                         m = SCTP_BUF_NEXT(m);
6551                 }
6552                 return (outchain);
6553         } else {
6554                 /* save off the end and update the end-chain position */
6555                 m = appendchain;
6556                 while (m) {
6557                         if (SCTP_BUF_NEXT(m) == NULL) {
6558                                 *endofchain = m;
6559                                 break;
6560                         }
6561                         m = SCTP_BUF_NEXT(m);
6562                 }
6563                 return (appendchain);
6564         }
6565 }
6566
6567 static int
6568 sctp_med_chunk_output(struct sctp_inpcb *inp,
6569     struct sctp_tcb *stcb,
6570     struct sctp_association *asoc,
6571     int *num_out,
6572     int *reason_code,
6573     int control_only, int from_where,
6574     struct timeval *now, int *now_filled, int 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_add_int(&stcb->asoc.refcnt, -1);
6652                 goto no_chunk_output;
6653         } else {
6654                 if (m) {
6655                         ret = sctp_msg_append(stcb, net, m,
6656                             &ca->sndrcv, 1);
6657                 }
6658                 asoc = &stcb->asoc;
6659                 if (ca->sndrcv.sinfo_flags & SCTP_EOF) {
6660                         /* shutdown this assoc */
6661                         if (TAILQ_EMPTY(&asoc->send_queue) &&
6662                             TAILQ_EMPTY(&asoc->sent_queue) &&
6663                             sctp_is_there_unsent_data(stcb, SCTP_SO_NOT_LOCKED) == 0) {
6664                                 if ((*asoc->ss_functions.sctp_ss_is_user_msgs_incomplete) (stcb, asoc)) {
6665                                         goto abort_anyway;
6666                                 }
6667                                 /*
6668                                  * there is nothing queued to send, so I'm
6669                                  * done...
6670                                  */
6671                                 if ((SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_SENT) &&
6672                                     (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
6673                                     (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
6674                                         /*
6675                                          * only send SHUTDOWN the first time
6676                                          * through
6677                                          */
6678                                         if (SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) {
6679                                                 SCTP_STAT_DECR_GAUGE32(sctps_currestab);
6680                                         }
6681                                         SCTP_SET_STATE(stcb, SCTP_STATE_SHUTDOWN_SENT);
6682                                         sctp_stop_timers_for_shutdown(stcb);
6683                                         sctp_send_shutdown(stcb, net);
6684                                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb,
6685                                             net);
6686                                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
6687                                             NULL);
6688                                         added_control = 1;
6689                                         do_chunk_output = 0;
6690                                 }
6691                         } else {
6692                                 /*
6693                                  * we still got (or just got) data to send,
6694                                  * so set SHUTDOWN_PENDING
6695                                  */
6696                                 /*
6697                                  * XXX sockets draft says that SCTP_EOF
6698                                  * should be sent with no data.  currently,
6699                                  * we will allow user data to be sent first
6700                                  * and move to SHUTDOWN-PENDING
6701                                  */
6702                                 if ((SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_SENT) &&
6703                                     (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
6704                                     (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
6705                                         if ((*asoc->ss_functions.sctp_ss_is_user_msgs_incomplete) (stcb, asoc)) {
6706                                                 SCTP_ADD_SUBSTATE(stcb, SCTP_STATE_PARTIAL_MSG_LEFT);
6707                                         }
6708                                         SCTP_ADD_SUBSTATE(stcb, SCTP_STATE_SHUTDOWN_PENDING);
6709                                         if (TAILQ_EMPTY(&asoc->send_queue) &&
6710                                             TAILQ_EMPTY(&asoc->sent_queue) &&
6711                                             (asoc->state & SCTP_STATE_PARTIAL_MSG_LEFT)) {
6712                                                 struct mbuf *op_err;
6713                                                 char msg[SCTP_DIAG_INFO_LEN];
6714
6715                                 abort_anyway:
6716                                                 SCTP_SNPRINTF(msg, sizeof(msg),
6717                                                     "%s:%d at %s", __FILE__, __LINE__, __func__);
6718                                                 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
6719                                                     msg);
6720                                                 atomic_add_int(&stcb->asoc.refcnt, 1);
6721                                                 sctp_abort_an_association(stcb->sctp_ep, stcb,
6722                                                     op_err, false, SCTP_SO_NOT_LOCKED);
6723                                                 atomic_add_int(&stcb->asoc.refcnt, -1);
6724                                                 goto no_chunk_output;
6725                                         }
6726                                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
6727                                             NULL);
6728                                 }
6729                         }
6730                 }
6731         }
6732         un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
6733             (stcb->asoc.stream_queue_cnt * SCTP_DATA_CHUNK_OVERHEAD(stcb)));
6734
6735         if ((sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY)) &&
6736             (stcb->asoc.total_flight > 0) &&
6737             (un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD))) {
6738                 do_chunk_output = 0;
6739         }
6740         if (do_chunk_output)
6741                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_NOT_LOCKED);
6742         else if (added_control) {
6743                 int num_out, reason, now_filled = 0;
6744                 struct timeval now;
6745                 int frag_point;
6746
6747                 frag_point = sctp_get_frag_point(stcb, &stcb->asoc);
6748                 (void)sctp_med_chunk_output(inp, stcb, &stcb->asoc, &num_out,
6749                     &reason, 1, 1, &now, &now_filled, frag_point, SCTP_SO_NOT_LOCKED);
6750         }
6751 no_chunk_output:
6752         if (ret) {
6753                 ca->cnt_failed++;
6754         } else {
6755                 ca->cnt_sent++;
6756         }
6757 }
6758
6759 static void
6760 sctp_sendall_completes(void *ptr, uint32_t val SCTP_UNUSED)
6761 {
6762         struct sctp_copy_all *ca;
6763
6764         ca = (struct sctp_copy_all *)ptr;
6765         /*
6766          * Do a notify here? Kacheong suggests that the notify be done at
6767          * the send time.. so you would push up a notification if any send
6768          * failed. Don't know if this is feasible since the only failures we
6769          * have is "memory" related and if you cannot get an mbuf to send
6770          * the data you surely can't get an mbuf to send up to notify the
6771          * user you can't send the data :->
6772          */
6773
6774         /* now free everything */
6775         if (ca->inp) {
6776                 /* Lets clear the flag to allow others to run. */
6777                 SCTP_INP_WLOCK(ca->inp);
6778                 ca->inp->sctp_flags &= ~SCTP_PCB_FLAGS_SND_ITERATOR_UP;
6779                 SCTP_INP_WUNLOCK(ca->inp);
6780         }
6781         sctp_m_freem(ca->m);
6782         SCTP_FREE(ca, SCTP_M_COPYAL);
6783 }
6784
6785 static struct mbuf *
6786 sctp_copy_out_all(struct uio *uio, ssize_t len)
6787 {
6788         struct mbuf *ret, *at;
6789         ssize_t left, willcpy, cancpy, error;
6790
6791         ret = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_WAITOK, 1, MT_DATA);
6792         if (ret == NULL) {
6793                 /* TSNH */
6794                 return (NULL);
6795         }
6796         left = len;
6797         SCTP_BUF_LEN(ret) = 0;
6798         /* save space for the data chunk header */
6799         cancpy = (int)M_TRAILINGSPACE(ret);
6800         willcpy = min(cancpy, left);
6801         at = ret;
6802         while (left > 0) {
6803                 /* Align data to the end */
6804                 error = uiomove(mtod(at, caddr_t), (int)willcpy, uio);
6805                 if (error) {
6806         err_out_now:
6807                         sctp_m_freem(at);
6808                         return (NULL);
6809                 }
6810                 SCTP_BUF_LEN(at) = (int)willcpy;
6811                 SCTP_BUF_NEXT_PKT(at) = SCTP_BUF_NEXT(at) = 0;
6812                 left -= willcpy;
6813                 if (left > 0) {
6814                         SCTP_BUF_NEXT(at) = sctp_get_mbuf_for_msg((unsigned int)left, 0, M_WAITOK, 1, MT_DATA);
6815                         if (SCTP_BUF_NEXT(at) == NULL) {
6816                                 goto err_out_now;
6817                         }
6818                         at = SCTP_BUF_NEXT(at);
6819                         SCTP_BUF_LEN(at) = 0;
6820                         cancpy = (int)M_TRAILINGSPACE(at);
6821                         willcpy = min(cancpy, left);
6822                 }
6823         }
6824         return (ret);
6825 }
6826
6827 static int
6828 sctp_sendall(struct sctp_inpcb *inp, struct uio *uio, struct mbuf *m,
6829     struct sctp_sndrcvinfo *srcv)
6830 {
6831         int ret;
6832         struct sctp_copy_all *ca;
6833
6834         if (uio->uio_resid > (ssize_t)SCTP_BASE_SYSCTL(sctp_sendall_limit)) {
6835                 /* You must not be larger than the limit! */
6836                 return (EMSGSIZE);
6837         }
6838         SCTP_MALLOC(ca, struct sctp_copy_all *, sizeof(struct sctp_copy_all),
6839             SCTP_M_COPYAL);
6840         if (ca == NULL) {
6841                 sctp_m_freem(m);
6842                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
6843                 return (ENOMEM);
6844         }
6845         memset(ca, 0, sizeof(struct sctp_copy_all));
6846
6847         ca->inp = inp;
6848         if (srcv) {
6849                 memcpy(&ca->sndrcv, srcv, sizeof(struct sctp_nonpad_sndrcvinfo));
6850         }
6851
6852         /* Serialize. */
6853         SCTP_INP_WLOCK(inp);
6854         if ((inp->sctp_flags & SCTP_PCB_FLAGS_SND_ITERATOR_UP) != 0) {
6855                 SCTP_INP_WUNLOCK(inp);
6856                 sctp_m_freem(m);
6857                 SCTP_FREE(ca, SCTP_M_COPYAL);
6858                 return (EBUSY);
6859         }
6860         inp->sctp_flags |= SCTP_PCB_FLAGS_SND_ITERATOR_UP;
6861         SCTP_INP_WUNLOCK(inp);
6862
6863         /*
6864          * take off the sendall flag, it would be bad if we failed to do
6865          * this :-0
6866          */
6867         ca->sndrcv.sinfo_flags &= ~SCTP_SENDALL;
6868         /* get length and mbuf chain */
6869         if (uio) {
6870                 ca->sndlen = uio->uio_resid;
6871                 ca->m = sctp_copy_out_all(uio, ca->sndlen);
6872                 if (ca->m == NULL) {
6873                         SCTP_FREE(ca, SCTP_M_COPYAL);
6874                         sctp_m_freem(m);
6875                         SCTP_INP_WLOCK(inp);
6876                         inp->sctp_flags &= ~SCTP_PCB_FLAGS_SND_ITERATOR_UP;
6877                         SCTP_INP_WUNLOCK(inp);
6878                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
6879                         return (ENOMEM);
6880                 }
6881         } else {
6882                 /* Gather the length of the send */
6883                 struct mbuf *mat;
6884
6885                 ca->sndlen = 0;
6886                 for (mat = m; mat; mat = SCTP_BUF_NEXT(mat)) {
6887                         ca->sndlen += SCTP_BUF_LEN(mat);
6888                 }
6889         }
6890         ret = sctp_initiate_iterator(NULL, sctp_sendall_iterator, NULL,
6891             SCTP_PCB_ANY_FLAGS, SCTP_PCB_ANY_FEATURES,
6892             SCTP_ASOC_ANY_STATE,
6893             (void *)ca, 0,
6894             sctp_sendall_completes, inp, 1);
6895         if (ret) {
6896                 SCTP_INP_WLOCK(inp);
6897                 inp->sctp_flags &= ~SCTP_PCB_FLAGS_SND_ITERATOR_UP;
6898                 SCTP_INP_WUNLOCK(inp);
6899                 SCTP_FREE(ca, SCTP_M_COPYAL);
6900                 SCTP_LTRACE_ERR_RET_PKT(m, inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EFAULT);
6901                 return (EFAULT);
6902         }
6903         return (0);
6904 }
6905
6906 void
6907 sctp_toss_old_cookies(struct sctp_tcb *stcb, struct sctp_association *asoc)
6908 {
6909         struct sctp_tmit_chunk *chk, *nchk;
6910
6911         TAILQ_FOREACH_SAFE(chk, &asoc->control_send_queue, sctp_next, nchk) {
6912                 if (chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
6913                         TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
6914                         asoc->ctrl_queue_cnt--;
6915                         if (chk->data) {
6916                                 sctp_m_freem(chk->data);
6917                                 chk->data = NULL;
6918                         }
6919                         sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
6920                 }
6921         }
6922 }
6923
6924 void
6925 sctp_toss_old_asconf(struct sctp_tcb *stcb)
6926 {
6927         struct sctp_association *asoc;
6928         struct sctp_tmit_chunk *chk, *nchk;
6929         struct sctp_asconf_chunk *acp;
6930
6931         asoc = &stcb->asoc;
6932         TAILQ_FOREACH_SAFE(chk, &asoc->asconf_send_queue, sctp_next, nchk) {
6933                 /* find SCTP_ASCONF chunk in queue */
6934                 if (chk->rec.chunk_id.id == SCTP_ASCONF) {
6935                         if (chk->data) {
6936                                 acp = mtod(chk->data, struct sctp_asconf_chunk *);
6937                                 if (SCTP_TSN_GT(ntohl(acp->serial_number), asoc->asconf_seq_out_acked)) {
6938                                         /* Not Acked yet */
6939                                         break;
6940                                 }
6941                         }
6942                         TAILQ_REMOVE(&asoc->asconf_send_queue, chk, sctp_next);
6943                         asoc->ctrl_queue_cnt--;
6944                         if (chk->data) {
6945                                 sctp_m_freem(chk->data);
6946                                 chk->data = NULL;
6947                         }
6948                         sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
6949                 }
6950         }
6951 }
6952
6953 static void
6954 sctp_clean_up_datalist(struct sctp_tcb *stcb,
6955     struct sctp_association *asoc,
6956     struct sctp_tmit_chunk **data_list,
6957     int bundle_at,
6958     struct sctp_nets *net)
6959 {
6960         int i;
6961         struct sctp_tmit_chunk *tp1;
6962
6963         for (i = 0; i < bundle_at; i++) {
6964                 /* off of the send queue */
6965                 TAILQ_REMOVE(&asoc->send_queue, data_list[i], sctp_next);
6966                 asoc->send_queue_cnt--;
6967                 if (i > 0) {
6968                         /*
6969                          * Any chunk NOT 0 you zap the time chunk 0 gets
6970                          * zapped or set based on if a RTO measurment is
6971                          * needed.
6972                          */
6973                         data_list[i]->do_rtt = 0;
6974                 }
6975                 /* record time */
6976                 data_list[i]->sent_rcv_time = net->last_sent_time;
6977                 data_list[i]->rec.data.cwnd_at_send = net->cwnd;
6978                 data_list[i]->rec.data.fast_retran_tsn = data_list[i]->rec.data.tsn;
6979                 if (data_list[i]->whoTo == NULL) {
6980                         data_list[i]->whoTo = net;
6981                         atomic_add_int(&net->ref_count, 1);
6982                 }
6983                 /* on to the sent queue */
6984                 tp1 = TAILQ_LAST(&asoc->sent_queue, sctpchunk_listhead);
6985                 if ((tp1) && SCTP_TSN_GT(tp1->rec.data.tsn, data_list[i]->rec.data.tsn)) {
6986                         struct sctp_tmit_chunk *tpp;
6987
6988                         /* need to move back */
6989         back_up_more:
6990                         tpp = TAILQ_PREV(tp1, sctpchunk_listhead, sctp_next);
6991                         if (tpp == NULL) {
6992                                 TAILQ_INSERT_BEFORE(tp1, data_list[i], sctp_next);
6993                                 goto all_done;
6994                         }
6995                         tp1 = tpp;
6996                         if (SCTP_TSN_GT(tp1->rec.data.tsn, data_list[i]->rec.data.tsn)) {
6997                                 goto back_up_more;
6998                         }
6999                         TAILQ_INSERT_AFTER(&asoc->sent_queue, tp1, data_list[i], sctp_next);
7000                 } else {
7001                         TAILQ_INSERT_TAIL(&asoc->sent_queue,
7002                             data_list[i],
7003                             sctp_next);
7004                 }
7005 all_done:
7006                 /* This does not lower until the cum-ack passes it */
7007                 asoc->sent_queue_cnt++;
7008                 if ((asoc->peers_rwnd <= 0) &&
7009                     (asoc->total_flight == 0) &&
7010                     (bundle_at == 1)) {
7011                         /* Mark the chunk as being a window probe */
7012                         SCTP_STAT_INCR(sctps_windowprobed);
7013                 }
7014 #ifdef SCTP_AUDITING_ENABLED
7015                 sctp_audit_log(0xC2, 3);
7016 #endif
7017                 data_list[i]->sent = SCTP_DATAGRAM_SENT;
7018                 data_list[i]->snd_count = 1;
7019                 data_list[i]->rec.data.chunk_was_revoked = 0;
7020                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
7021                         sctp_misc_ints(SCTP_FLIGHT_LOG_UP,
7022                             data_list[i]->whoTo->flight_size,
7023                             data_list[i]->book_size,
7024                             (uint32_t)(uintptr_t)data_list[i]->whoTo,
7025                             data_list[i]->rec.data.tsn);
7026                 }
7027                 sctp_flight_size_increase(data_list[i]);
7028                 sctp_total_flight_increase(stcb, data_list[i]);
7029                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_RWND_ENABLE) {
7030                         sctp_log_rwnd(SCTP_DECREASE_PEER_RWND,
7031                             asoc->peers_rwnd, data_list[i]->send_size, SCTP_BASE_SYSCTL(sctp_peer_chunk_oh));
7032                 }
7033                 asoc->peers_rwnd = sctp_sbspace_sub(asoc->peers_rwnd,
7034                     (uint32_t)(data_list[i]->send_size + SCTP_BASE_SYSCTL(sctp_peer_chunk_oh)));
7035                 if (asoc->peers_rwnd < stcb->sctp_ep->sctp_ep.sctp_sws_sender) {
7036                         /* SWS sender side engages */
7037                         asoc->peers_rwnd = 0;
7038                 }
7039         }
7040         if (asoc->cc_functions.sctp_cwnd_update_packet_transmitted) {
7041                 (*asoc->cc_functions.sctp_cwnd_update_packet_transmitted) (stcb, net);
7042         }
7043 }
7044
7045 static void
7046 sctp_clean_up_ctl(struct sctp_tcb *stcb, struct sctp_association *asoc, int so_locked)
7047 {
7048         struct sctp_tmit_chunk *chk, *nchk;
7049
7050         TAILQ_FOREACH_SAFE(chk, &asoc->control_send_queue, sctp_next, nchk) {
7051                 if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
7052                     (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK) ||  /* EY */
7053                     (chk->rec.chunk_id.id == SCTP_HEARTBEAT_REQUEST) ||
7054                     (chk->rec.chunk_id.id == SCTP_HEARTBEAT_ACK) ||
7055                     (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN) ||
7056                     (chk->rec.chunk_id.id == SCTP_SHUTDOWN) ||
7057                     (chk->rec.chunk_id.id == SCTP_SHUTDOWN_ACK) ||
7058                     (chk->rec.chunk_id.id == SCTP_OPERATION_ERROR) ||
7059                     (chk->rec.chunk_id.id == SCTP_PACKET_DROPPED) ||
7060                     (chk->rec.chunk_id.id == SCTP_COOKIE_ACK) ||
7061                     (chk->rec.chunk_id.id == SCTP_ECN_CWR) ||
7062                     (chk->rec.chunk_id.id == SCTP_ASCONF_ACK)) {
7063                         /* Stray chunks must be cleaned up */
7064         clean_up_anyway:
7065                         TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
7066                         asoc->ctrl_queue_cnt--;
7067                         if (chk->data) {
7068                                 sctp_m_freem(chk->data);
7069                                 chk->data = NULL;
7070                         }
7071                         if (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN) {
7072                                 asoc->fwd_tsn_cnt--;
7073                         }
7074                         sctp_free_a_chunk(stcb, chk, so_locked);
7075                 } else if (chk->rec.chunk_id.id == SCTP_STREAM_RESET) {
7076                         /* special handling, we must look into the param */
7077                         if (chk != asoc->str_reset) {
7078                                 goto clean_up_anyway;
7079                         }
7080                 }
7081         }
7082 }
7083
7084 static uint32_t
7085 sctp_can_we_split_this(struct sctp_tcb *stcb, uint32_t length,
7086     uint32_t space_left, uint32_t frag_point, int eeor_on)
7087 {
7088         /*
7089          * Make a decision on if I should split a msg into multiple parts.
7090          * This is only asked of incomplete messages.
7091          */
7092         if (eeor_on) {
7093                 /*
7094                  * If we are doing EEOR we need to always send it if its the
7095                  * entire thing, since it might be all the guy is putting in
7096                  * the hopper.
7097                  */
7098                 if (space_left >= length) {
7099                         /*-
7100                          * If we have data outstanding,
7101                          * we get another chance when the sack
7102                          * arrives to transmit - wait for more data
7103                          */
7104                         if (stcb->asoc.total_flight == 0) {
7105                                 /*
7106                                  * If nothing is in flight, we zero the
7107                                  * packet counter.
7108                                  */
7109                                 return (length);
7110                         }
7111                         return (0);
7112
7113                 } else {
7114                         /* You can fill the rest */
7115                         return (space_left);
7116                 }
7117         }
7118         /*-
7119          * For those strange folk that make the send buffer
7120          * smaller than our fragmentation point, we can't
7121          * get a full msg in so we have to allow splitting.
7122          */
7123         if (SCTP_SB_LIMIT_SND(stcb->sctp_socket) < frag_point) {
7124                 return (length);
7125         }
7126         if ((length <= space_left) ||
7127             ((length - space_left) < SCTP_BASE_SYSCTL(sctp_min_residual))) {
7128                 /* Sub-optimial residual don't split in non-eeor mode. */
7129                 return (0);
7130         }
7131         /*
7132          * If we reach here length is larger than the space_left. Do we wish
7133          * to split it for the sake of packet putting together?
7134          */
7135         if (space_left >= min(SCTP_BASE_SYSCTL(sctp_min_split_point), frag_point)) {
7136                 /* Its ok to split it */
7137                 return (min(space_left, frag_point));
7138         }
7139         /* Nope, can't split */
7140         return (0);
7141 }
7142
7143 static uint32_t
7144 sctp_move_to_outqueue(struct sctp_tcb *stcb,
7145     struct sctp_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         uint8_t send_lock_up = 0;
7164
7165         SCTP_TCB_LOCK_ASSERT(stcb);
7166         asoc = &stcb->asoc;
7167 one_more_time:
7168         /* sa_ignore FREED_MEMORY */
7169         sp = TAILQ_FIRST(&strq->outqueue);
7170         if (sp == NULL) {
7171                 if (send_lock_up == 0) {
7172                         SCTP_TCB_SEND_LOCK(stcb);
7173                         send_lock_up = 1;
7174                 }
7175                 sp = TAILQ_FIRST(&strq->outqueue);
7176                 if (sp) {
7177                         goto one_more_time;
7178                 }
7179                 if ((sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_EXPLICIT_EOR) == 0) &&
7180                     (stcb->asoc.idata_supported == 0) &&
7181                     (strq->last_msg_incomplete)) {
7182                         SCTP_PRINTF("Huh? Stream:%d lm_in_c=%d but queue is NULL\n",
7183                             strq->sid,
7184                             strq->last_msg_incomplete);
7185                         strq->last_msg_incomplete = 0;
7186                 }
7187                 to_move = 0;
7188                 if (send_lock_up) {
7189                         SCTP_TCB_SEND_UNLOCK(stcb);
7190                         send_lock_up = 0;
7191                 }
7192                 goto out_of;
7193         }
7194         if ((sp->msg_is_complete) && (sp->length == 0)) {
7195                 if (sp->sender_all_done) {
7196                         /*
7197                          * We are doing deferred cleanup. Last time through
7198                          * when we took all the data the sender_all_done was
7199                          * not set.
7200                          */
7201                         if ((sp->put_last_out == 0) && (sp->discard_rest == 0)) {
7202                                 SCTP_PRINTF("Gak, put out entire msg with NO end!-1\n");
7203                                 SCTP_PRINTF("sender_done:%d len:%d msg_comp:%d put_last_out:%d send_lock:%d\n",
7204                                     sp->sender_all_done,
7205                                     sp->length,
7206                                     sp->msg_is_complete,
7207                                     sp->put_last_out,
7208                                     send_lock_up);
7209                         }
7210                         if ((TAILQ_NEXT(sp, next) == NULL) && (send_lock_up == 0)) {
7211                                 SCTP_TCB_SEND_LOCK(stcb);
7212                                 send_lock_up = 1;
7213                         }
7214                         atomic_subtract_int(&asoc->stream_queue_cnt, 1);
7215                         TAILQ_REMOVE(&strq->outqueue, sp, next);
7216                         stcb->asoc.ss_functions.sctp_ss_remove_from_stream(stcb, asoc, strq, sp, send_lock_up);
7217                         if ((strq->state == SCTP_STREAM_RESET_PENDING) &&
7218                             (strq->chunks_on_queues == 0) &&
7219                             TAILQ_EMPTY(&strq->outqueue)) {
7220                                 stcb->asoc.trigger_reset = 1;
7221                         }
7222                         if (sp->net) {
7223                                 sctp_free_remote_addr(sp->net);
7224                                 sp->net = NULL;
7225                         }
7226                         if (sp->data) {
7227                                 sctp_m_freem(sp->data);
7228                                 sp->data = NULL;
7229                         }
7230                         sctp_free_a_strmoq(stcb, sp, so_locked);
7231                         /* we can't be locked to it */
7232                         if (send_lock_up) {
7233                                 SCTP_TCB_SEND_UNLOCK(stcb);
7234                                 send_lock_up = 0;
7235                         }
7236                         /* back to get the next msg */
7237                         goto one_more_time;
7238                 } else {
7239                         /*
7240                          * sender just finished this but still holds a
7241                          * reference
7242                          */
7243                         *giveup = 1;
7244                         to_move = 0;
7245                         goto out_of;
7246                 }
7247         } else {
7248                 /* is there some to get */
7249                 if (sp->length == 0) {
7250                         /* no */
7251                         *giveup = 1;
7252                         to_move = 0;
7253                         goto out_of;
7254                 } else if (sp->discard_rest) {
7255                         if (send_lock_up == 0) {
7256                                 SCTP_TCB_SEND_LOCK(stcb);
7257                                 send_lock_up = 1;
7258                         }
7259                         /* Whack down the size */
7260                         atomic_subtract_int(&stcb->asoc.total_output_queue_size, sp->length);
7261                         if ((stcb->sctp_socket != NULL) &&
7262                             ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
7263                             (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL))) {
7264                                 atomic_subtract_int(&stcb->sctp_socket->so_snd.sb_cc, sp->length);
7265                         }
7266                         if (sp->data) {
7267                                 sctp_m_freem(sp->data);
7268                                 sp->data = NULL;
7269                                 sp->tail_mbuf = NULL;
7270                         }
7271                         sp->length = 0;
7272                         sp->some_taken = 1;
7273                         *giveup = 1;
7274                         to_move = 0;
7275                         goto out_of;
7276                 }
7277         }
7278         some_taken = sp->some_taken;
7279 re_look:
7280         length = sp->length;
7281         if (sp->msg_is_complete) {
7282                 /* The message is complete */
7283                 to_move = min(length, frag_point);
7284                 if (to_move == length) {
7285                         /* All of it fits in the MTU */
7286                         if (sp->some_taken) {
7287                                 rcv_flags |= SCTP_DATA_LAST_FRAG;
7288                         } else {
7289                                 rcv_flags |= SCTP_DATA_NOT_FRAG;
7290                         }
7291                         sp->put_last_out = 1;
7292                         if (sp->sinfo_flags & SCTP_SACK_IMMEDIATELY) {
7293                                 rcv_flags |= SCTP_DATA_SACK_IMMEDIATELY;
7294                         }
7295                 } else {
7296                         /* Not all of it fits, we fragment */
7297                         if (sp->some_taken == 0) {
7298                                 rcv_flags |= SCTP_DATA_FIRST_FRAG;
7299                         }
7300                         sp->some_taken = 1;
7301                 }
7302         } else {
7303                 to_move = sctp_can_we_split_this(stcb, length, space_left, frag_point, eeor_mode);
7304                 if (to_move) {
7305                         /*-
7306                          * We use a snapshot of length in case it
7307                          * is expanding during the compare.
7308                          */
7309                         uint32_t llen;
7310
7311                         llen = length;
7312                         if (to_move >= llen) {
7313                                 to_move = llen;
7314                                 if (send_lock_up == 0) {
7315                                         /*-
7316                                          * We are taking all of an incomplete msg
7317                                          * thus we need a send lock.
7318                                          */
7319                                         SCTP_TCB_SEND_LOCK(stcb);
7320                                         send_lock_up = 1;
7321                                         if (sp->msg_is_complete) {
7322                                                 /*
7323                                                  * the sender finished the
7324                                                  * msg
7325                                                  */
7326                                                 goto re_look;
7327                                         }
7328                                 }
7329                         }
7330                         if (sp->some_taken == 0) {
7331                                 rcv_flags |= SCTP_DATA_FIRST_FRAG;
7332                                 sp->some_taken = 1;
7333                         }
7334                 } else {
7335                         /* Nothing to take. */
7336                         *giveup = 1;
7337                         to_move = 0;
7338                         goto out_of;
7339                 }
7340         }
7341
7342         /* If we reach here, we can copy out a chunk */
7343         sctp_alloc_a_chunk(stcb, chk);
7344         if (chk == NULL) {
7345                 /* No chunk memory */
7346                 *giveup = 1;
7347                 to_move = 0;
7348                 goto out_of;
7349         }
7350         /*
7351          * Setup for unordered if needed by looking at the user sent info
7352          * flags.
7353          */
7354         if (sp->sinfo_flags & SCTP_UNORDERED) {
7355                 rcv_flags |= SCTP_DATA_UNORDERED;
7356         }
7357         if (SCTP_BASE_SYSCTL(sctp_enable_sack_immediately) &&
7358             (sp->sinfo_flags & SCTP_EOF) == SCTP_EOF) {
7359                 rcv_flags |= SCTP_DATA_SACK_IMMEDIATELY;
7360         }
7361         /* clear out the chunk before setting up */
7362         memset(chk, 0, sizeof(*chk));
7363         chk->rec.data.rcv_flags = rcv_flags;
7364
7365         if (to_move >= length) {
7366                 /* we think we can steal the whole thing */
7367                 if ((sp->sender_all_done == 0) && (send_lock_up == 0)) {
7368                         SCTP_TCB_SEND_LOCK(stcb);
7369                         send_lock_up = 1;
7370                 }
7371                 if (to_move < sp->length) {
7372                         /* bail, it changed */
7373                         goto dont_do_it;
7374                 }
7375                 chk->data = sp->data;
7376                 chk->last_mbuf = sp->tail_mbuf;
7377                 /* register the stealing */
7378                 sp->data = sp->tail_mbuf = NULL;
7379         } else {
7380                 struct mbuf *m;
7381
7382 dont_do_it:
7383                 chk->data = SCTP_M_COPYM(sp->data, 0, to_move, M_NOWAIT);
7384                 chk->last_mbuf = NULL;
7385                 if (chk->data == NULL) {
7386                         sp->some_taken = some_taken;
7387                         sctp_free_a_chunk(stcb, chk, so_locked);
7388                         *bail = 1;
7389                         to_move = 0;
7390                         goto out_of;
7391                 }
7392 #ifdef SCTP_MBUF_LOGGING
7393                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
7394                         sctp_log_mbc(chk->data, SCTP_MBUF_ICOPY);
7395                 }
7396 #endif
7397                 /* Pull off the data */
7398                 m_adj(sp->data, to_move);
7399                 /* Now lets work our way down and compact it */
7400                 m = sp->data;
7401                 while (m && (SCTP_BUF_LEN(m) == 0)) {
7402                         sp->data = SCTP_BUF_NEXT(m);
7403                         SCTP_BUF_NEXT(m) = NULL;
7404                         if (sp->tail_mbuf == m) {
7405                                 /*-
7406                                  * Freeing tail? TSNH since
7407                                  * we supposedly were taking less
7408                                  * than the sp->length.
7409                                  */
7410 #ifdef INVARIANTS
7411                                 panic("Huh, freing tail? - TSNH");
7412 #else
7413                                 SCTP_PRINTF("Huh, freeing tail? - TSNH\n");
7414                                 sp->tail_mbuf = sp->data = NULL;
7415                                 sp->length = 0;
7416 #endif
7417                         }
7418                         sctp_m_free(m);
7419                         m = sp->data;
7420                 }
7421         }
7422         if (SCTP_BUF_IS_EXTENDED(chk->data)) {
7423                 chk->copy_by_ref = 1;
7424         } else {
7425                 chk->copy_by_ref = 0;
7426         }
7427         /*
7428          * get last_mbuf and counts of mb usage This is ugly but hopefully
7429          * its only one mbuf.
7430          */
7431         if (chk->last_mbuf == NULL) {
7432                 chk->last_mbuf = chk->data;
7433                 while (SCTP_BUF_NEXT(chk->last_mbuf) != NULL) {
7434                         chk->last_mbuf = SCTP_BUF_NEXT(chk->last_mbuf);
7435                 }
7436         }
7437
7438         if (to_move > length) {
7439                 /*- This should not happen either
7440                  * since we always lower to_move to the size
7441                  * of sp->length if its larger.
7442                  */
7443 #ifdef INVARIANTS
7444                 panic("Huh, how can to_move be larger?");
7445 #else
7446                 SCTP_PRINTF("Huh, how can to_move be larger?\n");
7447                 sp->length = 0;
7448 #endif
7449         } else {
7450                 atomic_subtract_int(&sp->length, to_move);
7451         }
7452         leading = SCTP_DATA_CHUNK_OVERHEAD(stcb);
7453         if (M_LEADINGSPACE(chk->data) < leading) {
7454                 /* Not enough room for a chunk header, get some */
7455                 struct mbuf *m;
7456
7457                 m = sctp_get_mbuf_for_msg(1, 0, M_NOWAIT, 1, MT_DATA);
7458                 if (m == NULL) {
7459                         /*
7460                          * we're in trouble here. _PREPEND below will free
7461                          * all the data if there is no leading space, so we
7462                          * must put the data back and restore.
7463                          */
7464                         if (send_lock_up == 0) {
7465                                 SCTP_TCB_SEND_LOCK(stcb);
7466                                 send_lock_up = 1;
7467                         }
7468                         if (sp->data == NULL) {
7469                                 /* unsteal the data */
7470                                 sp->data = chk->data;
7471                                 sp->tail_mbuf = chk->last_mbuf;
7472                         } else {
7473                                 struct mbuf *m_tmp;
7474
7475                                 /* reassemble the data */
7476                                 m_tmp = sp->data;
7477                                 sp->data = chk->data;
7478                                 SCTP_BUF_NEXT(chk->last_mbuf) = m_tmp;
7479                         }
7480                         sp->some_taken = some_taken;
7481                         atomic_add_int(&sp->length, to_move);
7482                         chk->data = NULL;
7483                         *bail = 1;
7484                         sctp_free_a_chunk(stcb, chk, so_locked);
7485                         to_move = 0;
7486                         goto out_of;
7487                 } else {
7488                         SCTP_BUF_LEN(m) = 0;
7489                         SCTP_BUF_NEXT(m) = chk->data;
7490                         chk->data = m;
7491                         M_ALIGN(chk->data, 4);
7492                 }
7493         }
7494         SCTP_BUF_PREPEND(chk->data, SCTP_DATA_CHUNK_OVERHEAD(stcb), M_NOWAIT);
7495         if (chk->data == NULL) {
7496                 /* HELP, TSNH since we assured it would not above? */
7497 #ifdef INVARIANTS
7498                 panic("prepend failes HELP?");
7499 #else
7500                 SCTP_PRINTF("prepend fails HELP?\n");
7501                 sctp_free_a_chunk(stcb, chk, so_locked);
7502 #endif
7503                 *bail = 1;
7504                 to_move = 0;
7505                 goto out_of;
7506         }
7507         sctp_snd_sb_alloc(stcb, SCTP_DATA_CHUNK_OVERHEAD(stcb));
7508         chk->book_size = chk->send_size = (uint16_t)(to_move + SCTP_DATA_CHUNK_OVERHEAD(stcb));
7509         chk->book_size_scale = 0;
7510         chk->sent = SCTP_DATAGRAM_UNSENT;
7511
7512         chk->flags = 0;
7513         chk->asoc = &stcb->asoc;
7514         chk->pad_inplace = 0;
7515         chk->no_fr_allowed = 0;
7516         if (stcb->asoc.idata_supported == 0) {
7517                 if (rcv_flags & SCTP_DATA_UNORDERED) {
7518                         /* Just use 0. The receiver ignores the values. */
7519                         chk->rec.data.mid = 0;
7520                 } else {
7521                         chk->rec.data.mid = strq->next_mid_ordered;
7522                         if (rcv_flags & SCTP_DATA_LAST_FRAG) {
7523                                 strq->next_mid_ordered++;
7524                         }
7525                 }
7526         } else {
7527                 if (rcv_flags & SCTP_DATA_UNORDERED) {
7528                         chk->rec.data.mid = strq->next_mid_unordered;
7529                         if (rcv_flags & SCTP_DATA_LAST_FRAG) {
7530                                 strq->next_mid_unordered++;
7531                         }
7532                 } else {
7533                         chk->rec.data.mid = strq->next_mid_ordered;
7534                         if (rcv_flags & SCTP_DATA_LAST_FRAG) {
7535                                 strq->next_mid_ordered++;
7536                         }
7537                 }
7538         }
7539         chk->rec.data.sid = sp->sid;
7540         chk->rec.data.ppid = sp->ppid;
7541         chk->rec.data.context = sp->context;
7542         chk->rec.data.doing_fast_retransmit = 0;
7543
7544         chk->rec.data.timetodrop = sp->ts;
7545         chk->flags = sp->act_flags;
7546
7547         if (sp->net) {
7548                 chk->whoTo = sp->net;
7549                 atomic_add_int(&chk->whoTo->ref_count, 1);
7550         } else
7551                 chk->whoTo = NULL;
7552
7553         if (sp->holds_key_ref) {
7554                 chk->auth_keyid = sp->auth_keyid;
7555                 sctp_auth_key_acquire(stcb, chk->auth_keyid);
7556                 chk->holds_key_ref = 1;
7557         }
7558         chk->rec.data.tsn = atomic_fetchadd_int(&asoc->sending_seq, 1);
7559         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_AT_SEND_2_OUTQ) {
7560                 sctp_misc_ints(SCTP_STRMOUT_LOG_SEND,
7561                     (uint32_t)(uintptr_t)stcb, sp->length,
7562                     (uint32_t)((chk->rec.data.sid << 16) | (0x0000ffff & chk->rec.data.mid)),
7563                     chk->rec.data.tsn);
7564         }
7565         if (stcb->asoc.idata_supported == 0) {
7566                 dchkh = mtod(chk->data, struct sctp_data_chunk *);
7567         } else {
7568                 ndchkh = mtod(chk->data, struct sctp_idata_chunk *);
7569         }
7570         /*
7571          * Put the rest of the things in place now. Size was done earlier in
7572          * previous loop prior to padding.
7573          */
7574
7575 #ifdef SCTP_ASOCLOG_OF_TSNS
7576         SCTP_TCB_LOCK_ASSERT(stcb);
7577         if (asoc->tsn_out_at >= SCTP_TSN_LOG_SIZE) {
7578                 asoc->tsn_out_at = 0;
7579                 asoc->tsn_out_wrapped = 1;
7580         }
7581         asoc->out_tsnlog[asoc->tsn_out_at].tsn = chk->rec.data.tsn;
7582         asoc->out_tsnlog[asoc->tsn_out_at].strm = chk->rec.data.sid;
7583         asoc->out_tsnlog[asoc->tsn_out_at].seq = chk->rec.data.mid;
7584         asoc->out_tsnlog[asoc->tsn_out_at].sz = chk->send_size;
7585         asoc->out_tsnlog[asoc->tsn_out_at].flgs = chk->rec.data.rcv_flags;
7586         asoc->out_tsnlog[asoc->tsn_out_at].stcb = (void *)stcb;
7587         asoc->out_tsnlog[asoc->tsn_out_at].in_pos = asoc->tsn_out_at;
7588         asoc->out_tsnlog[asoc->tsn_out_at].in_out = 2;
7589         asoc->tsn_out_at++;
7590 #endif
7591         if (stcb->asoc.idata_supported == 0) {
7592                 dchkh->ch.chunk_type = SCTP_DATA;
7593                 dchkh->ch.chunk_flags = chk->rec.data.rcv_flags;
7594                 dchkh->dp.tsn = htonl(chk->rec.data.tsn);
7595                 dchkh->dp.sid = htons(strq->sid);
7596                 dchkh->dp.ssn = htons((uint16_t)chk->rec.data.mid);
7597                 dchkh->dp.ppid = chk->rec.data.ppid;
7598                 dchkh->ch.chunk_length = htons(chk->send_size);
7599         } else {
7600                 ndchkh->ch.chunk_type = SCTP_IDATA;
7601                 ndchkh->ch.chunk_flags = chk->rec.data.rcv_flags;
7602                 ndchkh->dp.tsn = htonl(chk->rec.data.tsn);
7603                 ndchkh->dp.sid = htons(strq->sid);
7604                 ndchkh->dp.reserved = htons(0);
7605                 ndchkh->dp.mid = htonl(chk->rec.data.mid);
7606                 if (sp->fsn == 0)
7607                         ndchkh->dp.ppid_fsn.ppid = chk->rec.data.ppid;
7608                 else
7609                         ndchkh->dp.ppid_fsn.fsn = htonl(sp->fsn);
7610                 sp->fsn++;
7611                 ndchkh->ch.chunk_length = htons(chk->send_size);
7612         }
7613         /* Now advance the chk->send_size by the actual pad needed. */
7614         if (chk->send_size < SCTP_SIZE32(chk->book_size)) {
7615                 /* need a pad */
7616                 struct mbuf *lm;
7617                 int pads;
7618
7619                 pads = SCTP_SIZE32(chk->book_size) - chk->send_size;
7620                 lm = sctp_pad_lastmbuf(chk->data, pads, chk->last_mbuf);
7621                 if (lm != NULL) {
7622                         chk->last_mbuf = lm;
7623                         chk->pad_inplace = 1;
7624                 }
7625                 chk->send_size += pads;
7626         }
7627         if (PR_SCTP_ENABLED(chk->flags)) {
7628                 asoc->pr_sctp_cnt++;
7629         }
7630         if (sp->msg_is_complete && (sp->length == 0) && (sp->sender_all_done)) {
7631                 /* All done pull and kill the message */
7632                 if (sp->put_last_out == 0) {
7633                         SCTP_PRINTF("Gak, put out entire msg with NO end!-2\n");
7634                         SCTP_PRINTF("sender_done:%d len:%d msg_comp:%d put_last_out:%d send_lock:%d\n",
7635                             sp->sender_all_done,
7636                             sp->length,
7637                             sp->msg_is_complete,
7638                             sp->put_last_out,
7639                             send_lock_up);
7640                 }
7641                 if ((send_lock_up == 0) && (TAILQ_NEXT(sp, next) == NULL)) {
7642                         SCTP_TCB_SEND_LOCK(stcb);
7643                         send_lock_up = 1;
7644                 }
7645                 atomic_subtract_int(&asoc->stream_queue_cnt, 1);
7646                 TAILQ_REMOVE(&strq->outqueue, sp, next);
7647                 stcb->asoc.ss_functions.sctp_ss_remove_from_stream(stcb, asoc, strq, sp, send_lock_up);
7648                 if ((strq->state == SCTP_STREAM_RESET_PENDING) &&
7649                     (strq->chunks_on_queues == 0) &&
7650                     TAILQ_EMPTY(&strq->outqueue)) {
7651                         stcb->asoc.trigger_reset = 1;
7652                 }
7653                 if (sp->net) {
7654                         sctp_free_remote_addr(sp->net);
7655                         sp->net = NULL;
7656                 }
7657                 if (sp->data) {
7658                         sctp_m_freem(sp->data);
7659                         sp->data = NULL;
7660                 }
7661                 sctp_free_a_strmoq(stcb, sp, so_locked);
7662         }
7663         asoc->chunks_on_out_queue++;
7664         strq->chunks_on_queues++;
7665         TAILQ_INSERT_TAIL(&asoc->send_queue, chk, sctp_next);
7666         asoc->send_queue_cnt++;
7667 out_of:
7668         if (send_lock_up) {
7669                 SCTP_TCB_SEND_UNLOCK(stcb);
7670         }
7671         return (to_move);
7672 }
7673
7674 static void
7675 sctp_fill_outqueue(struct sctp_tcb *stcb,
7676     struct sctp_nets *net, int frag_point, int eeor_mode, int *quit_now, int so_locked)
7677 {
7678         struct sctp_association *asoc;
7679         struct sctp_stream_out *strq;
7680         uint32_t space_left, moved, total_moved;
7681         int bail, giveup;
7682
7683         SCTP_TCB_LOCK_ASSERT(stcb);
7684         asoc = &stcb->asoc;
7685         total_moved = 0;
7686         switch (net->ro._l_addr.sa.sa_family) {
7687 #ifdef INET
7688         case AF_INET:
7689                 space_left = net->mtu - SCTP_MIN_V4_OVERHEAD;
7690                 break;
7691 #endif
7692 #ifdef INET6
7693         case AF_INET6:
7694                 space_left = net->mtu - SCTP_MIN_OVERHEAD;
7695                 break;
7696 #endif
7697         default:
7698                 /* TSNH */
7699                 space_left = net->mtu;
7700                 break;
7701         }
7702         /* Need an allowance for the data chunk header too */
7703         space_left -= SCTP_DATA_CHUNK_OVERHEAD(stcb);
7704
7705         /* must make even word boundary */
7706         space_left &= 0xfffffffc;
7707         strq = stcb->asoc.ss_functions.sctp_ss_select_stream(stcb, net, asoc);
7708         giveup = 0;
7709         bail = 0;
7710         while ((space_left > 0) && (strq != NULL)) {
7711                 moved = sctp_move_to_outqueue(stcb, strq, space_left, frag_point,
7712                     &giveup, eeor_mode, &bail, so_locked);
7713                 stcb->asoc.ss_functions.sctp_ss_scheduled(stcb, net, asoc, strq, moved);
7714                 if ((giveup != 0) || (bail != 0)) {
7715                         break;
7716                 }
7717                 strq = stcb->asoc.ss_functions.sctp_ss_select_stream(stcb, net, asoc);
7718                 total_moved += moved;
7719                 if (space_left >= moved) {
7720                         space_left -= moved;
7721                 } else {
7722                         space_left = 0;
7723                 }
7724                 if (space_left >= SCTP_DATA_CHUNK_OVERHEAD(stcb)) {
7725                         space_left -= SCTP_DATA_CHUNK_OVERHEAD(stcb);
7726                 } else {
7727                         space_left = 0;
7728                 }
7729                 space_left &= 0xfffffffc;
7730         }
7731         if (bail != 0)
7732                 *quit_now = 1;
7733
7734         stcb->asoc.ss_functions.sctp_ss_packet_done(stcb, net, asoc);
7735
7736         if (total_moved == 0) {
7737                 if ((stcb->asoc.sctp_cmt_on_off == 0) &&
7738                     (net == stcb->asoc.primary_destination)) {
7739                         /* ran dry for primary network net */
7740                         SCTP_STAT_INCR(sctps_primary_randry);
7741                 } else if (stcb->asoc.sctp_cmt_on_off > 0) {
7742                         /* ran dry with CMT on */
7743                         SCTP_STAT_INCR(sctps_cmt_randry);
7744                 }
7745         }
7746 }
7747
7748 void
7749 sctp_fix_ecn_echo(struct sctp_association *asoc)
7750 {
7751         struct sctp_tmit_chunk *chk;
7752
7753         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
7754                 if (chk->rec.chunk_id.id == SCTP_ECN_ECHO) {
7755                         chk->sent = SCTP_DATAGRAM_UNSENT;
7756                 }
7757         }
7758 }
7759
7760 void
7761 sctp_move_chunks_from_net(struct sctp_tcb *stcb, struct sctp_nets *net)
7762 {
7763         struct sctp_association *asoc;
7764         struct sctp_tmit_chunk *chk;
7765         struct sctp_stream_queue_pending *sp;
7766         unsigned int i;
7767
7768         if (net == NULL) {
7769                 return;
7770         }
7771         asoc = &stcb->asoc;
7772         for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
7773                 TAILQ_FOREACH(sp, &stcb->asoc.strmout[i].outqueue, next) {
7774                         if (sp->net == net) {
7775                                 sctp_free_remote_addr(sp->net);
7776                                 sp->net = NULL;
7777                         }
7778                 }
7779         }
7780         TAILQ_FOREACH(chk, &asoc->send_queue, sctp_next) {
7781                 if (chk->whoTo == net) {
7782                         sctp_free_remote_addr(chk->whoTo);
7783                         chk->whoTo = NULL;
7784                 }
7785         }
7786 }
7787
7788 int
7789 sctp_med_chunk_output(struct sctp_inpcb *inp,
7790     struct sctp_tcb *stcb,
7791     struct sctp_association *asoc,
7792     int *num_out,
7793     int *reason_code,
7794     int control_only, int from_where,
7795     struct timeval *now, int *now_filled, int frag_point, int so_locked)
7796 {
7797         /**
7798          * Ok this is the generic chunk service queue. we must do the
7799          * following:
7800          * - Service the stream queue that is next, moving any
7801          *   message (note I must get a complete message i.e. FIRST/MIDDLE and
7802          *   LAST to the out queue in one pass) and assigning TSN's. This
7803          *   only applys though if the peer does not support NDATA. For NDATA
7804          *   chunks its ok to not send the entire message ;-)
7805          * - Check to see if the cwnd/rwnd allows any output, if so we go ahead and
7806          *   fomulate and send the low level chunks. Making sure to combine
7807          *   any control in the control chunk queue also.
7808          */
7809         struct sctp_nets *net, *start_at, *sack_goes_to = NULL, *old_start_at = NULL;
7810         struct mbuf *outchain, *endoutchain;
7811         struct sctp_tmit_chunk *chk, *nchk;
7812
7813         /* temp arrays for unlinking */
7814         struct sctp_tmit_chunk *data_list[SCTP_MAX_DATA_BUNDLING];
7815         int no_fragmentflg, error;
7816         unsigned int max_rwnd_per_dest, max_send_per_dest;
7817         int one_chunk, hbflag, skip_data_for_this_net;
7818         int asconf, cookie, no_out_cnt;
7819         int bundle_at, ctl_cnt, no_data_chunks, eeor_mode;
7820         unsigned int mtu, r_mtu, omtu, mx_mtu, to_out;
7821         int tsns_sent = 0;
7822         uint32_t auth_offset;
7823         struct sctp_auth_chunk *auth;
7824         uint16_t auth_keyid;
7825         int override_ok = 1;
7826         int skip_fill_up = 0;
7827         int data_auth_reqd = 0;
7828
7829         /*
7830          * JRS 5/14/07 - Add flag for whether a heartbeat is sent to the
7831          * destination.
7832          */
7833         int quit_now = 0;
7834
7835         *num_out = 0;
7836         *reason_code = 0;
7837         auth_keyid = stcb->asoc.authinfo.active_keyid;
7838         if ((asoc->state & SCTP_STATE_SHUTDOWN_PENDING) ||
7839             (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_RECEIVED) ||
7840             (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_EXPLICIT_EOR))) {
7841                 eeor_mode = 1;
7842         } else {
7843                 eeor_mode = 0;
7844         }
7845         ctl_cnt = no_out_cnt = asconf = cookie = 0;
7846         /*
7847          * First lets prime the pump. For each destination, if there is room
7848          * in the flight size, attempt to pull an MTU's worth out of the
7849          * stream queues into the general send_queue
7850          */
7851 #ifdef SCTP_AUDITING_ENABLED
7852         sctp_audit_log(0xC2, 2);
7853 #endif
7854         SCTP_TCB_LOCK_ASSERT(stcb);
7855         hbflag = 0;
7856         if (control_only)
7857                 no_data_chunks = 1;
7858         else
7859                 no_data_chunks = 0;
7860
7861         /* Nothing to possible to send? */
7862         if ((TAILQ_EMPTY(&asoc->control_send_queue) ||
7863             (asoc->ctrl_queue_cnt == stcb->asoc.ecn_echo_cnt_onq)) &&
7864             TAILQ_EMPTY(&asoc->asconf_send_queue) &&
7865             TAILQ_EMPTY(&asoc->send_queue) &&
7866             sctp_is_there_unsent_data(stcb, so_locked) == 0) {
7867 nothing_to_send:
7868                 *reason_code = 9;
7869                 return (0);
7870         }
7871         if (asoc->peers_rwnd == 0) {
7872                 /* No room in peers rwnd */
7873                 *reason_code = 1;
7874                 if (asoc->total_flight > 0) {
7875                         /* we are allowed one chunk in flight */
7876                         no_data_chunks = 1;
7877                 }
7878         }
7879         if (stcb->asoc.ecn_echo_cnt_onq) {
7880                 /* Record where a sack goes, if any */
7881                 if (no_data_chunks &&
7882                     (asoc->ctrl_queue_cnt == stcb->asoc.ecn_echo_cnt_onq)) {
7883                         /* Nothing but ECNe to send - we don't do that */
7884                         goto nothing_to_send;
7885                 }
7886                 TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
7887                         if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
7888                             (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK)) {
7889                                 sack_goes_to = chk->whoTo;
7890                                 break;
7891                         }
7892                 }
7893         }
7894         max_rwnd_per_dest = ((asoc->peers_rwnd + asoc->total_flight) / asoc->numnets);
7895         if (stcb->sctp_socket)
7896                 max_send_per_dest = SCTP_SB_LIMIT_SND(stcb->sctp_socket) / asoc->numnets;
7897         else
7898                 max_send_per_dest = 0;
7899         if (no_data_chunks == 0) {
7900                 /* How many non-directed chunks are there? */
7901                 TAILQ_FOREACH(chk, &asoc->send_queue, sctp_next) {
7902                         if (chk->whoTo == NULL) {
7903                                 /*
7904                                  * We already have non-directed chunks on
7905                                  * the queue, no need to do a fill-up.
7906                                  */
7907                                 skip_fill_up = 1;
7908                                 break;
7909                         }
7910                 }
7911         }
7912         if ((no_data_chunks == 0) &&
7913             (skip_fill_up == 0) &&
7914             (!stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc))) {
7915                 TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
7916                         /*
7917                          * This for loop we are in takes in each net, if
7918                          * its's got space in cwnd and has data sent to it
7919                          * (when CMT is off) then it calls
7920                          * sctp_fill_outqueue for the net. This gets data on
7921                          * the send queue for that network.
7922                          *
7923                          * In sctp_fill_outqueue TSN's are assigned and data
7924                          * is copied out of the stream buffers. Note mostly
7925                          * copy by reference (we hope).
7926                          */
7927                         net->window_probe = 0;
7928                         if ((net != stcb->asoc.alternate) &&
7929                             ((net->dest_state & SCTP_ADDR_PF) ||
7930                             (!(net->dest_state & SCTP_ADDR_REACHABLE)) ||
7931                             (net->dest_state & SCTP_ADDR_UNCONFIRMED))) {
7932                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
7933                                         sctp_log_cwnd(stcb, net, 1,
7934                                             SCTP_CWND_LOG_FILL_OUTQ_CALLED);
7935                                 }
7936                                 continue;
7937                         }
7938                         if ((stcb->asoc.cc_functions.sctp_cwnd_new_transmission_begins) &&
7939                             (net->flight_size == 0)) {
7940                                 (*stcb->asoc.cc_functions.sctp_cwnd_new_transmission_begins) (stcb, net);
7941                         }
7942                         if (net->flight_size >= net->cwnd) {
7943                                 /* skip this network, no room - can't fill */
7944                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
7945                                         sctp_log_cwnd(stcb, net, 3,
7946                                             SCTP_CWND_LOG_FILL_OUTQ_CALLED);
7947                                 }
7948                                 continue;
7949                         }
7950                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
7951                                 sctp_log_cwnd(stcb, net, 4, SCTP_CWND_LOG_FILL_OUTQ_CALLED);
7952                         }
7953                         sctp_fill_outqueue(stcb, net, frag_point, eeor_mode, &quit_now, so_locked);
7954                         if (quit_now) {
7955                                 /* memory alloc failure */
7956                                 no_data_chunks = 1;
7957                                 break;
7958                         }
7959                 }
7960         }
7961         /* now service each destination and send out what we can for it */
7962         /* Nothing to send? */
7963         if (TAILQ_EMPTY(&asoc->control_send_queue) &&
7964             TAILQ_EMPTY(&asoc->asconf_send_queue) &&
7965             TAILQ_EMPTY(&asoc->send_queue)) {
7966                 *reason_code = 8;
7967                 return (0);
7968         }
7969
7970         if (asoc->sctp_cmt_on_off > 0) {
7971                 /* get the last start point */
7972                 start_at = asoc->last_net_cmt_send_started;
7973                 if (start_at == NULL) {
7974                         /* null so to beginning */
7975                         start_at = TAILQ_FIRST(&asoc->nets);
7976                 } else {
7977                         start_at = TAILQ_NEXT(asoc->last_net_cmt_send_started, sctp_next);
7978                         if (start_at == NULL) {
7979                                 start_at = TAILQ_FIRST(&asoc->nets);
7980                         }
7981                 }
7982                 asoc->last_net_cmt_send_started = start_at;
7983         } else {
7984                 start_at = TAILQ_FIRST(&asoc->nets);
7985         }
7986         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
7987                 if (chk->whoTo == NULL) {
7988                         if (asoc->alternate) {
7989                                 chk->whoTo = asoc->alternate;
7990                         } else {
7991                                 chk->whoTo = asoc->primary_destination;
7992                         }
7993                         atomic_add_int(&chk->whoTo->ref_count, 1);
7994                 }
7995         }
7996         old_start_at = NULL;
7997 again_one_more_time:
7998         for (net = start_at; net != NULL; net = TAILQ_NEXT(net, sctp_next)) {
7999                 /* how much can we send? */
8000                 /* SCTPDBG("Examine for sending net:%x\n", (uint32_t)net); */
8001                 if (old_start_at && (old_start_at == net)) {
8002                         /* through list ocmpletely. */
8003                         break;
8004                 }
8005                 tsns_sent = 0xa;
8006                 if (TAILQ_EMPTY(&asoc->control_send_queue) &&
8007                     TAILQ_EMPTY(&asoc->asconf_send_queue) &&
8008                     (net->flight_size >= net->cwnd)) {
8009                         /*
8010                          * Nothing on control or asconf and flight is full,
8011                          * we can skip even in the CMT case.
8012                          */
8013                         continue;
8014                 }
8015                 bundle_at = 0;
8016                 endoutchain = outchain = NULL;
8017                 auth = NULL;
8018                 auth_offset = 0;
8019                 no_fragmentflg = 1;
8020                 one_chunk = 0;
8021                 if (net->dest_state & SCTP_ADDR_UNCONFIRMED) {
8022                         skip_data_for_this_net = 1;
8023                 } else {
8024                         skip_data_for_this_net = 0;
8025                 }
8026                 switch (((struct sockaddr *)&net->ro._l_addr)->sa_family) {
8027 #ifdef INET
8028                 case AF_INET:
8029                         mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
8030                         break;
8031 #endif
8032 #ifdef INET6
8033                 case AF_INET6:
8034                         mtu = net->mtu - SCTP_MIN_OVERHEAD;
8035                         break;
8036 #endif
8037                 default:
8038                         /* TSNH */
8039                         mtu = net->mtu;
8040                         break;
8041                 }
8042                 mx_mtu = mtu;
8043                 to_out = 0;
8044                 if (mtu > asoc->peers_rwnd) {
8045                         if (asoc->total_flight > 0) {
8046                                 /* We have a packet in flight somewhere */
8047                                 r_mtu = asoc->peers_rwnd;
8048                         } else {
8049                                 /* We are always allowed to send one MTU out */
8050                                 one_chunk = 1;
8051                                 r_mtu = mtu;
8052                         }
8053                 } else {
8054                         r_mtu = mtu;
8055                 }
8056                 error = 0;
8057                 /************************/
8058                 /* ASCONF transmission */
8059                 /************************/
8060                 /* Now first lets go through the asconf queue */
8061                 TAILQ_FOREACH_SAFE(chk, &asoc->asconf_send_queue, sctp_next, nchk) {
8062                         if (chk->rec.chunk_id.id != SCTP_ASCONF) {
8063                                 continue;
8064                         }
8065                         if (chk->whoTo == NULL) {
8066                                 if (asoc->alternate == NULL) {
8067                                         if (asoc->primary_destination != net) {
8068                                                 break;
8069                                         }
8070                                 } else {
8071                                         if (asoc->alternate != net) {
8072                                                 break;
8073                                         }
8074                                 }
8075                         } else {
8076                                 if (chk->whoTo != net) {
8077                                         break;
8078                                 }
8079                         }
8080                         if (chk->data == NULL) {
8081                                 break;
8082                         }
8083                         if (chk->sent != SCTP_DATAGRAM_UNSENT &&
8084                             chk->sent != SCTP_DATAGRAM_RESEND) {
8085                                 break;
8086                         }
8087                         /*
8088                          * if no AUTH is yet included and this chunk
8089                          * requires it, make sure to account for it.  We
8090                          * don't apply the size until the AUTH chunk is
8091                          * actually added below in case there is no room for
8092                          * this chunk. NOTE: we overload the use of "omtu"
8093                          * here
8094                          */
8095                         if ((auth == NULL) &&
8096                             sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
8097                             stcb->asoc.peer_auth_chunks)) {
8098                                 omtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
8099                         } else
8100                                 omtu = 0;
8101                         /* Here we do NOT factor the r_mtu */
8102                         if ((chk->send_size < (int)(mtu - omtu)) ||
8103                             (chk->flags & CHUNK_FLAGS_FRAGMENT_OK)) {
8104                                 /*
8105                                  * We probably should glom the mbuf chain
8106                                  * from the chk->data for control but the
8107                                  * problem is it becomes yet one more level
8108                                  * of tracking to do if for some reason
8109                                  * output fails. Then I have got to
8110                                  * reconstruct the merged control chain.. el
8111                                  * yucko.. for now we take the easy way and
8112                                  * do the copy
8113                                  */
8114                                 /*
8115                                  * Add an AUTH chunk, if chunk requires it
8116                                  * save the offset into the chain for AUTH
8117                                  */
8118                                 if ((auth == NULL) &&
8119                                     (sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
8120                                     stcb->asoc.peer_auth_chunks))) {
8121                                         outchain = sctp_add_auth_chunk(outchain,
8122                                             &endoutchain,
8123                                             &auth,
8124                                             &auth_offset,
8125                                             stcb,
8126                                             chk->rec.chunk_id.id);
8127                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8128                                 }
8129                                 outchain = sctp_copy_mbufchain(chk->data, outchain, &endoutchain,
8130                                     (int)chk->rec.chunk_id.can_take_data,
8131                                     chk->send_size, chk->copy_by_ref);
8132                                 if (outchain == NULL) {
8133                                         *reason_code = 8;
8134                                         SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
8135                                         return (ENOMEM);
8136                                 }
8137                                 SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8138                                 /* update our MTU size */
8139                                 if (mtu > (chk->send_size + omtu))
8140                                         mtu -= (chk->send_size + omtu);
8141                                 else
8142                                         mtu = 0;
8143                                 to_out += (chk->send_size + omtu);
8144                                 /* Do clear IP_DF ? */
8145                                 if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
8146                                         no_fragmentflg = 0;
8147                                 }
8148                                 if (chk->rec.chunk_id.can_take_data)
8149                                         chk->data = NULL;
8150                                 /*
8151                                  * set hb flag since we can use these for
8152                                  * RTO
8153                                  */
8154                                 hbflag = 1;
8155                                 asconf = 1;
8156                                 /*
8157                                  * should sysctl this: don't bundle data
8158                                  * with ASCONF since it requires AUTH
8159                                  */
8160                                 no_data_chunks = 1;
8161                                 chk->sent = SCTP_DATAGRAM_SENT;
8162                                 if (chk->whoTo == NULL) {
8163                                         chk->whoTo = net;
8164                                         atomic_add_int(&net->ref_count, 1);
8165                                 }
8166                                 chk->snd_count++;
8167                                 if (mtu == 0) {
8168                                         /*
8169                                          * Ok we are out of room but we can
8170                                          * output without effecting the
8171                                          * flight size since this little guy
8172                                          * is a control only packet.
8173                                          */
8174                                         sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp, stcb, net);
8175                                         /*
8176                                          * do NOT clear the asconf flag as
8177                                          * it is used to do appropriate
8178                                          * source address selection.
8179                                          */
8180                                         if (*now_filled == 0) {
8181                                                 (void)SCTP_GETTIME_TIMEVAL(now);
8182                                                 *now_filled = 1;
8183                                         }
8184                                         net->last_sent_time = *now;
8185                                         hbflag = 0;
8186                                         if ((error = sctp_lowlevel_chunk_output(inp, stcb, net,
8187                                             (struct sockaddr *)&net->ro._l_addr,
8188                                             outchain, auth_offset, auth,
8189                                             stcb->asoc.authinfo.active_keyid,
8190                                             no_fragmentflg, 0, asconf,
8191                                             inp->sctp_lport, stcb->rport,
8192                                             htonl(stcb->asoc.peer_vtag),
8193                                             net->port, NULL,
8194                                             0, 0,
8195                                             so_locked))) {
8196                                                 /*
8197                                                  * error, we could not
8198                                                  * output
8199                                                  */
8200                                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
8201                                                 if (from_where == 0) {
8202                                                         SCTP_STAT_INCR(sctps_lowlevelerrusr);
8203                                                 }
8204                                                 if (error == ENOBUFS) {
8205                                                         asoc->ifp_had_enobuf = 1;
8206                                                         SCTP_STAT_INCR(sctps_lowlevelerr);
8207                                                 }
8208                                                 /* error, could not output */
8209                                                 if (error == EHOSTUNREACH) {
8210                                                         /*
8211                                                          * Destination went
8212                                                          * unreachable
8213                                                          * during this send
8214                                                          */
8215                                                         sctp_move_chunks_from_net(stcb, net);
8216                                                 }
8217                                                 *reason_code = 7;
8218                                                 break;
8219                                         } else {
8220                                                 asoc->ifp_had_enobuf = 0;
8221                                         }
8222                                         /*
8223                                          * increase the number we sent, if a
8224                                          * cookie is sent we don't tell them
8225                                          * any was sent out.
8226                                          */
8227                                         outchain = endoutchain = NULL;
8228                                         auth = NULL;
8229                                         auth_offset = 0;
8230                                         if (!no_out_cnt)
8231                                                 *num_out += ctl_cnt;
8232                                         /* recalc a clean slate and setup */
8233                                         switch (net->ro._l_addr.sa.sa_family) {
8234 #ifdef INET
8235                                         case AF_INET:
8236                                                 mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
8237                                                 break;
8238 #endif
8239 #ifdef INET6
8240                                         case AF_INET6:
8241                                                 mtu = net->mtu - SCTP_MIN_OVERHEAD;
8242                                                 break;
8243 #endif
8244                                         default:
8245                                                 /* TSNH */
8246                                                 mtu = net->mtu;
8247                                                 break;
8248                                         }
8249                                         to_out = 0;
8250                                         no_fragmentflg = 1;
8251                                 }
8252                         }
8253                 }
8254                 if (error != 0) {
8255                         /* try next net */
8256                         continue;
8257                 }
8258                 /************************/
8259                 /* Control transmission */
8260                 /************************/
8261                 /* Now first lets go through the control queue */
8262                 TAILQ_FOREACH_SAFE(chk, &asoc->control_send_queue, sctp_next, nchk) {
8263                         if ((sack_goes_to) &&
8264                             (chk->rec.chunk_id.id == SCTP_ECN_ECHO) &&
8265                             (chk->whoTo != sack_goes_to)) {
8266                                 /*
8267                                  * if we have a sack in queue, and we are
8268                                  * looking at an ecn echo that is NOT queued
8269                                  * to where the sack is going..
8270                                  */
8271                                 if (chk->whoTo == net) {
8272                                         /*
8273                                          * Don't transmit it to where its
8274                                          * going (current net)
8275                                          */
8276                                         continue;
8277                                 } else if (sack_goes_to == net) {
8278                                         /*
8279                                          * But do transmit it to this
8280                                          * address
8281                                          */
8282                                         goto skip_net_check;
8283                                 }
8284                         }
8285                         if (chk->whoTo == NULL) {
8286                                 if (asoc->alternate == NULL) {
8287                                         if (asoc->primary_destination != net) {
8288                                                 continue;
8289                                         }
8290                                 } else {
8291                                         if (asoc->alternate != net) {
8292                                                 continue;
8293                                         }
8294                                 }
8295                         } else {
8296                                 if (chk->whoTo != net) {
8297                                         continue;
8298                                 }
8299                         }
8300         skip_net_check:
8301                         if (chk->data == NULL) {
8302                                 continue;
8303                         }
8304                         if (chk->sent != SCTP_DATAGRAM_UNSENT) {
8305                                 /*
8306                                  * It must be unsent. Cookies and ASCONF's
8307                                  * hang around but there timers will force
8308                                  * when marked for resend.
8309                                  */
8310                                 continue;
8311                         }
8312                         /*
8313                          * if no AUTH is yet included and this chunk
8314                          * requires it, make sure to account for it.  We
8315                          * don't apply the size until the AUTH chunk is
8316                          * actually added below in case there is no room for
8317                          * this chunk. NOTE: we overload the use of "omtu"
8318                          * here
8319                          */
8320                         if ((auth == NULL) &&
8321                             sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
8322                             stcb->asoc.peer_auth_chunks)) {
8323                                 omtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
8324                         } else
8325                                 omtu = 0;
8326                         /* Here we do NOT factor the r_mtu */
8327                         if ((chk->send_size <= (int)(mtu - omtu)) ||
8328                             (chk->flags & CHUNK_FLAGS_FRAGMENT_OK)) {
8329                                 /*
8330                                  * We probably should glom the mbuf chain
8331                                  * from the chk->data for control but the
8332                                  * problem is it becomes yet one more level
8333                                  * of tracking to do if for some reason
8334                                  * output fails. Then I have got to
8335                                  * reconstruct the merged control chain.. el
8336                                  * yucko.. for now we take the easy way and
8337                                  * do the copy
8338                                  */
8339                                 /*
8340                                  * Add an AUTH chunk, if chunk requires it
8341                                  * save the offset into the chain for AUTH
8342                                  */
8343                                 if ((auth == NULL) &&
8344                                     (sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
8345                                     stcb->asoc.peer_auth_chunks))) {
8346                                         outchain = sctp_add_auth_chunk(outchain,
8347                                             &endoutchain,
8348                                             &auth,
8349                                             &auth_offset,
8350                                             stcb,
8351                                             chk->rec.chunk_id.id);
8352                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8353                                 }
8354                                 outchain = sctp_copy_mbufchain(chk->data, outchain, &endoutchain,
8355                                     (int)chk->rec.chunk_id.can_take_data,
8356                                     chk->send_size, chk->copy_by_ref);
8357                                 if (outchain == NULL) {
8358                                         *reason_code = 8;
8359                                         SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
8360                                         return (ENOMEM);
8361                                 }
8362                                 SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8363                                 /* update our MTU size */
8364                                 if (mtu > (chk->send_size + omtu))
8365                                         mtu -= (chk->send_size + omtu);
8366                                 else
8367                                         mtu = 0;
8368                                 to_out += (chk->send_size + omtu);
8369                                 /* Do clear IP_DF ? */
8370                                 if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
8371                                         no_fragmentflg = 0;
8372                                 }
8373                                 if (chk->rec.chunk_id.can_take_data)
8374                                         chk->data = NULL;
8375                                 /* Mark things to be removed, if needed */
8376                                 if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
8377                                     (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK) ||  /* EY */
8378                                     (chk->rec.chunk_id.id == SCTP_HEARTBEAT_REQUEST) ||
8379                                     (chk->rec.chunk_id.id == SCTP_HEARTBEAT_ACK) ||
8380                                     (chk->rec.chunk_id.id == SCTP_SHUTDOWN) ||
8381                                     (chk->rec.chunk_id.id == SCTP_SHUTDOWN_ACK) ||
8382                                     (chk->rec.chunk_id.id == SCTP_OPERATION_ERROR) ||
8383                                     (chk->rec.chunk_id.id == SCTP_COOKIE_ACK) ||
8384                                     (chk->rec.chunk_id.id == SCTP_ECN_CWR) ||
8385                                     (chk->rec.chunk_id.id == SCTP_PACKET_DROPPED) ||
8386                                     (chk->rec.chunk_id.id == SCTP_ASCONF_ACK)) {
8387                                         if (chk->rec.chunk_id.id == SCTP_HEARTBEAT_REQUEST) {
8388                                                 hbflag = 1;
8389                                         }
8390                                         /* remove these chunks at the end */
8391                                         if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
8392                                             (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK)) {
8393                                                 /* turn off the timer */
8394                                                 if (SCTP_OS_TIMER_PENDING(&stcb->asoc.dack_timer.timer)) {
8395                                                         sctp_timer_stop(SCTP_TIMER_TYPE_RECV,
8396                                                             inp, stcb, NULL,
8397                                                             SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_1);
8398                                                 }
8399                                         }
8400                                         ctl_cnt++;
8401                                 } else {
8402                                         /*
8403                                          * Other chunks, since they have
8404                                          * timers running (i.e. COOKIE) we
8405                                          * just "trust" that it gets sent or
8406                                          * retransmitted.
8407                                          */
8408                                         ctl_cnt++;
8409                                         if (chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
8410                                                 cookie = 1;
8411                                                 no_out_cnt = 1;
8412                                         } else if (chk->rec.chunk_id.id == SCTP_ECN_ECHO) {
8413                                                 /*
8414                                                  * Increment ecne send count
8415                                                  * here this means we may be
8416                                                  * over-zealous in our
8417                                                  * counting if the send
8418                                                  * fails, but its the best
8419                                                  * place to do it (we used
8420                                                  * to do it in the queue of
8421                                                  * the chunk, but that did
8422                                                  * not tell how many times
8423                                                  * it was sent.
8424                                                  */
8425                                                 SCTP_STAT_INCR(sctps_sendecne);
8426                                         }
8427                                         chk->sent = SCTP_DATAGRAM_SENT;
8428                                         if (chk->whoTo == NULL) {
8429                                                 chk->whoTo = net;
8430                                                 atomic_add_int(&net->ref_count, 1);
8431                                         }
8432                                         chk->snd_count++;
8433                                 }
8434                                 if (mtu == 0) {
8435                                         /*
8436                                          * Ok we are out of room but we can
8437                                          * output without effecting the
8438                                          * flight size since this little guy
8439                                          * is a control only packet.
8440                                          */
8441                                         if (asconf) {
8442                                                 sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp, stcb, net);
8443                                                 /*
8444                                                  * do NOT clear the asconf
8445                                                  * flag as it is used to do
8446                                                  * appropriate source
8447                                                  * address selection.
8448                                                  */
8449                                         }
8450                                         if (cookie) {
8451                                                 sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, inp, stcb, net);
8452                                                 cookie = 0;
8453                                         }
8454                                         /* Only HB or ASCONF advances time */
8455                                         if (hbflag) {
8456                                                 if (*now_filled == 0) {
8457                                                         (void)SCTP_GETTIME_TIMEVAL(now);
8458                                                         *now_filled = 1;
8459                                                 }
8460                                                 net->last_sent_time = *now;
8461                                                 hbflag = 0;
8462                                         }
8463                                         if ((error = sctp_lowlevel_chunk_output(inp, stcb, net,
8464                                             (struct sockaddr *)&net->ro._l_addr,
8465                                             outchain,
8466                                             auth_offset, auth,
8467                                             stcb->asoc.authinfo.active_keyid,
8468                                             no_fragmentflg, 0, asconf,
8469                                             inp->sctp_lport, stcb->rport,
8470                                             htonl(stcb->asoc.peer_vtag),
8471                                             net->port, NULL,
8472                                             0, 0,
8473                                             so_locked))) {
8474                                                 /*
8475                                                  * error, we could not
8476                                                  * output
8477                                                  */
8478                                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
8479                                                 if (from_where == 0) {
8480                                                         SCTP_STAT_INCR(sctps_lowlevelerrusr);
8481                                                 }
8482                                                 if (error == ENOBUFS) {
8483                                                         asoc->ifp_had_enobuf = 1;
8484                                                         SCTP_STAT_INCR(sctps_lowlevelerr);
8485                                                 }
8486                                                 if (error == EHOSTUNREACH) {
8487                                                         /*
8488                                                          * Destination went
8489                                                          * unreachable
8490                                                          * during this send
8491                                                          */
8492                                                         sctp_move_chunks_from_net(stcb, net);
8493                                                 }
8494                                                 *reason_code = 7;
8495                                                 break;
8496                                         } else {
8497                                                 asoc->ifp_had_enobuf = 0;
8498                                         }
8499                                         /*
8500                                          * increase the number we sent, if a
8501                                          * cookie is sent we don't tell them
8502                                          * any was sent out.
8503                                          */
8504                                         outchain = endoutchain = NULL;
8505                                         auth = NULL;
8506                                         auth_offset = 0;
8507                                         if (!no_out_cnt)
8508                                                 *num_out += ctl_cnt;
8509                                         /* recalc a clean slate and setup */
8510                                         switch (net->ro._l_addr.sa.sa_family) {
8511 #ifdef INET
8512                                         case AF_INET:
8513                                                 mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
8514                                                 break;
8515 #endif
8516 #ifdef INET6
8517                                         case AF_INET6:
8518                                                 mtu = net->mtu - SCTP_MIN_OVERHEAD;
8519                                                 break;
8520 #endif
8521                                         default:
8522                                                 /* TSNH */
8523                                                 mtu = net->mtu;
8524                                                 break;
8525                                         }
8526                                         to_out = 0;
8527                                         no_fragmentflg = 1;
8528                                 }
8529                         }
8530                 }
8531                 if (error != 0) {
8532                         /* try next net */
8533                         continue;
8534                 }
8535                 /* JRI: if dest is in PF state, do not send data to it */
8536                 if ((asoc->sctp_cmt_on_off > 0) &&
8537                     (net != stcb->asoc.alternate) &&
8538                     (net->dest_state & SCTP_ADDR_PF)) {
8539                         goto no_data_fill;
8540                 }
8541                 if (net->flight_size >= net->cwnd) {
8542                         goto no_data_fill;
8543                 }
8544                 if ((asoc->sctp_cmt_on_off > 0) &&
8545                     (SCTP_BASE_SYSCTL(sctp_buffer_splitting) & SCTP_RECV_BUFFER_SPLITTING) &&
8546                     (net->flight_size > max_rwnd_per_dest)) {
8547                         goto no_data_fill;
8548                 }
8549                 /*
8550                  * We need a specific accounting for the usage of the send
8551                  * buffer. We also need to check the number of messages per
8552                  * net. For now, this is better than nothing and it disabled
8553                  * by default...
8554                  */
8555                 if ((asoc->sctp_cmt_on_off > 0) &&
8556                     (SCTP_BASE_SYSCTL(sctp_buffer_splitting) & SCTP_SEND_BUFFER_SPLITTING) &&
8557                     (max_send_per_dest > 0) &&
8558                     (net->flight_size > max_send_per_dest)) {
8559                         goto no_data_fill;
8560                 }
8561                 /*********************/
8562                 /* Data transmission */
8563                 /*********************/
8564                 /*
8565                  * if AUTH for DATA is required and no AUTH has been added
8566                  * yet, account for this in the mtu now... if no data can be
8567                  * bundled, this adjustment won't matter anyways since the
8568                  * packet will be going out...
8569                  */
8570                 data_auth_reqd = sctp_auth_is_required_chunk(SCTP_DATA,
8571                     stcb->asoc.peer_auth_chunks);
8572                 if (data_auth_reqd && (auth == NULL)) {
8573                         mtu -= sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
8574                 }
8575                 /* now lets add any data within the MTU constraints */
8576                 switch (((struct sockaddr *)&net->ro._l_addr)->sa_family) {
8577 #ifdef INET
8578                 case AF_INET:
8579                         if (net->mtu > SCTP_MIN_V4_OVERHEAD)
8580                                 omtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
8581                         else
8582                                 omtu = 0;
8583                         break;
8584 #endif
8585 #ifdef INET6
8586                 case AF_INET6:
8587                         if (net->mtu > SCTP_MIN_OVERHEAD)
8588                                 omtu = net->mtu - SCTP_MIN_OVERHEAD;
8589                         else
8590                                 omtu = 0;
8591                         break;
8592 #endif
8593                 default:
8594                         /* TSNH */
8595                         omtu = 0;
8596                         break;
8597                 }
8598                 if ((((SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) ||
8599                     (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_RECEIVED)) &&
8600                     (skip_data_for_this_net == 0)) ||
8601                     (cookie)) {
8602                         TAILQ_FOREACH_SAFE(chk, &asoc->send_queue, sctp_next, nchk) {
8603                                 if (no_data_chunks) {
8604                                         /* let only control go out */
8605                                         *reason_code = 1;
8606                                         break;
8607                                 }
8608                                 if (net->flight_size >= net->cwnd) {
8609                                         /* skip this net, no room for data */
8610                                         *reason_code = 2;
8611                                         break;
8612                                 }
8613                                 if ((chk->whoTo != NULL) &&
8614                                     (chk->whoTo != net)) {
8615                                         /* Don't send the chunk on this net */
8616                                         continue;
8617                                 }
8618
8619                                 if (asoc->sctp_cmt_on_off == 0) {
8620                                         if ((asoc->alternate) &&
8621                                             (asoc->alternate != net) &&
8622                                             (chk->whoTo == NULL)) {
8623                                                 continue;
8624                                         } else if ((net != asoc->primary_destination) &&
8625                                                     (asoc->alternate == NULL) &&
8626                                             (chk->whoTo == NULL)) {
8627                                                 continue;
8628                                         }
8629                                 }
8630                                 if ((chk->send_size > omtu) && ((chk->flags & CHUNK_FLAGS_FRAGMENT_OK) == 0)) {
8631                                         /*-
8632                                          * strange, we have a chunk that is
8633                                          * to big for its destination and
8634                                          * yet no fragment ok flag.
8635                                          * Something went wrong when the
8636                                          * PMTU changed...we did not mark
8637                                          * this chunk for some reason?? I
8638                                          * will fix it here by letting IP
8639                                          * fragment it for now and printing
8640                                          * a warning. This really should not
8641                                          * happen ...
8642                                          */
8643                                         SCTP_PRINTF("Warning chunk of %d bytes > mtu:%d and yet PMTU disc missed\n",
8644                                             chk->send_size, mtu);
8645                                         chk->flags |= CHUNK_FLAGS_FRAGMENT_OK;
8646                                 }
8647                                 if (SCTP_BASE_SYSCTL(sctp_enable_sack_immediately) &&
8648                                     (asoc->state & SCTP_STATE_SHUTDOWN_PENDING)) {
8649                                         struct sctp_data_chunk *dchkh;
8650
8651                                         dchkh = mtod(chk->data, struct sctp_data_chunk *);
8652                                         dchkh->ch.chunk_flags |= SCTP_DATA_SACK_IMMEDIATELY;
8653                                 }
8654                                 if (((chk->send_size <= mtu) && (chk->send_size <= r_mtu)) ||
8655                                     ((chk->flags & CHUNK_FLAGS_FRAGMENT_OK) && (chk->send_size <= asoc->peers_rwnd))) {
8656                                         /* ok we will add this one */
8657
8658                                         /*
8659                                          * Add an AUTH chunk, if chunk
8660                                          * requires it, save the offset into
8661                                          * the chain for AUTH
8662                                          */
8663                                         if (data_auth_reqd) {
8664                                                 if (auth == NULL) {
8665                                                         outchain = sctp_add_auth_chunk(outchain,
8666                                                             &endoutchain,
8667                                                             &auth,
8668                                                             &auth_offset,
8669                                                             stcb,
8670                                                             SCTP_DATA);
8671                                                         auth_keyid = chk->auth_keyid;
8672                                                         override_ok = 0;
8673                                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8674                                                 } else if (override_ok) {
8675                                                         /*
8676                                                          * use this data's
8677                                                          * keyid
8678                                                          */
8679                                                         auth_keyid = chk->auth_keyid;
8680                                                         override_ok = 0;
8681                                                 } else if (auth_keyid != chk->auth_keyid) {
8682                                                         /*
8683                                                          * different keyid,
8684                                                          * so done bundling
8685                                                          */
8686                                                         break;
8687                                                 }
8688                                         }
8689                                         outchain = sctp_copy_mbufchain(chk->data, outchain, &endoutchain, 0,
8690                                             chk->send_size, chk->copy_by_ref);
8691                                         if (outchain == NULL) {
8692                                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "No memory?\n");
8693                                                 if (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
8694                                                         sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
8695                                                 }
8696                                                 *reason_code = 3;
8697                                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
8698                                                 return (ENOMEM);
8699                                         }
8700                                         /* upate our MTU size */
8701                                         /* Do clear IP_DF ? */
8702                                         if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
8703                                                 no_fragmentflg = 0;
8704                                         }
8705                                         /* unsigned subtraction of mtu */
8706                                         if (mtu > chk->send_size)
8707                                                 mtu -= chk->send_size;
8708                                         else
8709                                                 mtu = 0;
8710                                         /* unsigned subtraction of r_mtu */
8711                                         if (r_mtu > chk->send_size)
8712                                                 r_mtu -= chk->send_size;
8713                                         else
8714                                                 r_mtu = 0;
8715
8716                                         to_out += chk->send_size;
8717                                         if ((to_out > mx_mtu) && no_fragmentflg) {
8718 #ifdef INVARIANTS
8719                                                 panic("Exceeding mtu of %d out size is %d", mx_mtu, to_out);
8720 #else
8721                                                 SCTP_PRINTF("Exceeding mtu of %d out size is %d\n",
8722                                                     mx_mtu, to_out);
8723 #endif
8724                                         }
8725                                         chk->window_probe = 0;
8726                                         data_list[bundle_at++] = chk;
8727                                         if (bundle_at >= SCTP_MAX_DATA_BUNDLING) {
8728                                                 break;
8729                                         }
8730                                         if (chk->sent == SCTP_DATAGRAM_UNSENT) {
8731                                                 if ((chk->rec.data.rcv_flags & SCTP_DATA_UNORDERED) == 0) {
8732                                                         SCTP_STAT_INCR_COUNTER64(sctps_outorderchunks);
8733                                                 } else {
8734                                                         SCTP_STAT_INCR_COUNTER64(sctps_outunorderchunks);
8735                                                 }
8736                                                 if (((chk->rec.data.rcv_flags & SCTP_DATA_LAST_FRAG) == SCTP_DATA_LAST_FRAG) &&
8737                                                     ((chk->rec.data.rcv_flags & SCTP_DATA_FIRST_FRAG) == 0))
8738                                                         /*
8739                                                          * Count number of
8740                                                          * user msg's that
8741                                                          * were fragmented
8742                                                          * we do this by
8743                                                          * counting when we
8744                                                          * see a LAST
8745                                                          * fragment only.
8746                                                          */
8747                                                         SCTP_STAT_INCR_COUNTER64(sctps_fragusrmsgs);
8748                                         }
8749                                         if ((mtu == 0) || (r_mtu == 0) || (one_chunk)) {
8750                                                 if ((one_chunk) && (stcb->asoc.total_flight == 0)) {
8751                                                         data_list[0]->window_probe = 1;
8752                                                         net->window_probe = 1;
8753                                                 }
8754                                                 break;
8755                                         }
8756                                 } else {
8757                                         /*
8758                                          * Must be sent in order of the
8759                                          * TSN's (on a network)
8760                                          */
8761                                         break;
8762                                 }
8763                         }       /* for (chunk gather loop for this net) */
8764                 }               /* if asoc.state OPEN */
8765 no_data_fill:
8766                 /* Is there something to send for this destination? */
8767                 if (outchain) {
8768                         /* We may need to start a control timer or two */
8769                         if (asconf) {
8770                                 sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp,
8771                                     stcb, net);
8772                                 /*
8773                                  * do NOT clear the asconf flag as it is
8774                                  * used to do appropriate source address
8775                                  * selection.
8776                                  */
8777                         }
8778                         if (cookie) {
8779                                 sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, inp, stcb, net);
8780                                 cookie = 0;
8781                         }
8782                         /* must start a send timer if data is being sent */
8783                         if (bundle_at && (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer))) {
8784                                 /*
8785                                  * no timer running on this destination
8786                                  * restart it.
8787                                  */
8788                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
8789                         }
8790                         if (bundle_at || hbflag) {
8791                                 /* For data/asconf and hb set time */
8792                                 if (*now_filled == 0) {
8793                                         (void)SCTP_GETTIME_TIMEVAL(now);
8794                                         *now_filled = 1;
8795                                 }
8796                                 net->last_sent_time = *now;
8797                         }
8798                         /* Now send it, if there is anything to send :> */
8799                         if ((error = sctp_lowlevel_chunk_output(inp,
8800                             stcb,
8801                             net,
8802                             (struct sockaddr *)&net->ro._l_addr,
8803                             outchain,
8804                             auth_offset,
8805                             auth,
8806                             auth_keyid,
8807                             no_fragmentflg,
8808                             bundle_at,
8809                             asconf,
8810                             inp->sctp_lport, stcb->rport,
8811                             htonl(stcb->asoc.peer_vtag),
8812                             net->port, NULL,
8813                             0, 0,
8814                             so_locked))) {
8815                                 /* error, we could not output */
8816                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
8817                                 if (from_where == 0) {
8818                                         SCTP_STAT_INCR(sctps_lowlevelerrusr);
8819                                 }
8820                                 if (error == ENOBUFS) {
8821                                         asoc->ifp_had_enobuf = 1;
8822                                         SCTP_STAT_INCR(sctps_lowlevelerr);
8823                                 }
8824                                 if (error == EHOSTUNREACH) {
8825                                         /*
8826                                          * Destination went unreachable
8827                                          * during this send
8828                                          */
8829                                         sctp_move_chunks_from_net(stcb, net);
8830                                 }
8831                                 *reason_code = 6;
8832                                 /*-
8833                                  * I add this line to be paranoid. As far as
8834                                  * I can tell the continue, takes us back to
8835                                  * the top of the for, but just to make sure
8836                                  * I will reset these again here.
8837                                  */
8838                                 ctl_cnt = 0;
8839                                 continue;       /* This takes us back to the
8840                                                  * for() for the nets. */
8841                         } else {
8842                                 asoc->ifp_had_enobuf = 0;
8843                         }
8844                         endoutchain = NULL;
8845                         auth = NULL;
8846                         auth_offset = 0;
8847                         if (!no_out_cnt) {
8848                                 *num_out += (ctl_cnt + bundle_at);
8849                         }
8850                         if (bundle_at) {
8851                                 /* setup for a RTO measurement */
8852                                 tsns_sent = data_list[0]->rec.data.tsn;
8853                                 /* fill time if not already filled */
8854                                 if (*now_filled == 0) {
8855                                         (void)SCTP_GETTIME_TIMEVAL(&asoc->time_last_sent);
8856                                         *now_filled = 1;
8857                                         *now = asoc->time_last_sent;
8858                                 } else {
8859                                         asoc->time_last_sent = *now;
8860                                 }
8861                                 if (net->rto_needed) {
8862                                         data_list[0]->do_rtt = 1;
8863                                         net->rto_needed = 0;
8864                                 }
8865                                 SCTP_STAT_INCR_BY(sctps_senddata, bundle_at);
8866                                 sctp_clean_up_datalist(stcb, asoc, data_list, bundle_at, net);
8867                         }
8868                         if (one_chunk) {
8869                                 break;
8870                         }
8871                 }
8872                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
8873                         sctp_log_cwnd(stcb, net, tsns_sent, SCTP_CWND_LOG_FROM_SEND);
8874                 }
8875         }
8876         if (old_start_at == NULL) {
8877                 old_start_at = start_at;
8878                 start_at = TAILQ_FIRST(&asoc->nets);
8879                 if (old_start_at)
8880                         goto again_one_more_time;
8881         }
8882
8883         /*
8884          * At the end there should be no NON timed chunks hanging on this
8885          * queue.
8886          */
8887         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
8888                 sctp_log_cwnd(stcb, net, *num_out, SCTP_CWND_LOG_FROM_SEND);
8889         }
8890         if ((*num_out == 0) && (*reason_code == 0)) {
8891                 *reason_code = 4;
8892         } else {
8893                 *reason_code = 5;
8894         }
8895         sctp_clean_up_ctl(stcb, asoc, so_locked);
8896         return (0);
8897 }
8898
8899 void
8900 sctp_queue_op_err(struct sctp_tcb *stcb, struct mbuf *op_err)
8901 {
8902         /*-
8903          * Prepend a OPERATIONAL_ERROR chunk header and put on the end of
8904          * the control chunk queue.
8905          */
8906         struct sctp_chunkhdr *hdr;
8907         struct sctp_tmit_chunk *chk;
8908         struct mbuf *mat, *last_mbuf;
8909         uint32_t chunk_length;
8910         uint16_t padding_length;
8911
8912         SCTP_TCB_LOCK_ASSERT(stcb);
8913         SCTP_BUF_PREPEND(op_err, sizeof(struct sctp_chunkhdr), M_NOWAIT);
8914         if (op_err == NULL) {
8915                 return;
8916         }
8917         last_mbuf = NULL;
8918         chunk_length = 0;
8919         for (mat = op_err; mat != NULL; mat = SCTP_BUF_NEXT(mat)) {
8920                 chunk_length += SCTP_BUF_LEN(mat);
8921                 if (SCTP_BUF_NEXT(mat) == NULL) {
8922                         last_mbuf = mat;
8923                 }
8924         }
8925         if (chunk_length > SCTP_MAX_CHUNK_LENGTH) {
8926                 sctp_m_freem(op_err);
8927                 return;
8928         }
8929         padding_length = chunk_length % 4;
8930         if (padding_length != 0) {
8931                 padding_length = 4 - padding_length;
8932         }
8933         if (padding_length != 0) {
8934                 if (sctp_add_pad_tombuf(last_mbuf, padding_length) == NULL) {
8935                         sctp_m_freem(op_err);
8936                         return;
8937                 }
8938         }
8939         sctp_alloc_a_chunk(stcb, chk);
8940         if (chk == NULL) {
8941                 /* no memory */
8942                 sctp_m_freem(op_err);
8943                 return;
8944         }
8945         chk->copy_by_ref = 0;
8946         chk->rec.chunk_id.id = SCTP_OPERATION_ERROR;
8947         chk->rec.chunk_id.can_take_data = 0;
8948         chk->flags = 0;
8949         chk->send_size = (uint16_t)chunk_length;
8950         chk->sent = SCTP_DATAGRAM_UNSENT;
8951         chk->snd_count = 0;
8952         chk->asoc = &stcb->asoc;
8953         chk->data = op_err;
8954         chk->whoTo = NULL;
8955         hdr = mtod(op_err, struct sctp_chunkhdr *);
8956         hdr->chunk_type = SCTP_OPERATION_ERROR;
8957         hdr->chunk_flags = 0;
8958         hdr->chunk_length = htons(chk->send_size);
8959         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
8960         chk->asoc->ctrl_queue_cnt++;
8961 }
8962
8963 int
8964 sctp_send_cookie_echo(struct mbuf *m,
8965     int offset, int limit,
8966     struct sctp_tcb *stcb,
8967     struct sctp_nets *net)
8968 {
8969         /*-
8970          * pull out the cookie and put it at the front of the control chunk
8971          * queue.
8972          */
8973         int at;
8974         struct mbuf *cookie;
8975         struct sctp_paramhdr param, *phdr;
8976         struct sctp_chunkhdr *hdr;
8977         struct sctp_tmit_chunk *chk;
8978         uint16_t ptype, plen;
8979
8980         SCTP_TCB_LOCK_ASSERT(stcb);
8981         /* First find the cookie in the param area */
8982         cookie = NULL;
8983         at = offset + sizeof(struct sctp_init_chunk);
8984         for (;;) {
8985                 phdr = sctp_get_next_param(m, at, &param, sizeof(param));
8986                 if (phdr == NULL) {
8987                         return (-3);
8988                 }
8989                 ptype = ntohs(phdr->param_type);
8990                 plen = ntohs(phdr->param_length);
8991                 if (plen < sizeof(struct sctp_paramhdr)) {
8992                         return (-6);
8993                 }
8994                 if (ptype == SCTP_STATE_COOKIE) {
8995                         int pad;
8996
8997                         /* found the cookie */
8998                         if (at + plen > limit) {
8999                                 return (-7);
9000                         }
9001                         cookie = SCTP_M_COPYM(m, at, plen, M_NOWAIT);
9002                         if (cookie == NULL) {
9003                                 /* No memory */
9004                                 return (-2);
9005                         }
9006                         if ((pad = (plen % 4)) > 0) {
9007                                 pad = 4 - pad;
9008                         }
9009                         if (pad > 0) {
9010                                 if (sctp_pad_lastmbuf(cookie, pad, NULL) == NULL) {
9011                                         return (-8);
9012                                 }
9013                         }
9014 #ifdef SCTP_MBUF_LOGGING
9015                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
9016                                 sctp_log_mbc(cookie, SCTP_MBUF_ICOPY);
9017                         }
9018 #endif
9019                         break;
9020                 }
9021                 at += SCTP_SIZE32(plen);
9022         }
9023         /* ok, we got the cookie lets change it into a cookie echo chunk */
9024         /* first the change from param to cookie */
9025         hdr = mtod(cookie, struct sctp_chunkhdr *);
9026         hdr->chunk_type = SCTP_COOKIE_ECHO;
9027         hdr->chunk_flags = 0;
9028         /* get the chunk stuff now and place it in the FRONT of the queue */
9029         sctp_alloc_a_chunk(stcb, chk);
9030         if (chk == NULL) {
9031                 /* no memory */
9032                 sctp_m_freem(cookie);
9033                 return (-5);
9034         }
9035         chk->copy_by_ref = 0;
9036         chk->rec.chunk_id.id = SCTP_COOKIE_ECHO;
9037         chk->rec.chunk_id.can_take_data = 0;
9038         chk->flags = CHUNK_FLAGS_FRAGMENT_OK;
9039         chk->send_size = SCTP_SIZE32(plen);
9040         chk->sent = SCTP_DATAGRAM_UNSENT;
9041         chk->snd_count = 0;
9042         chk->asoc = &stcb->asoc;
9043         chk->data = cookie;
9044         chk->whoTo = net;
9045         atomic_add_int(&chk->whoTo->ref_count, 1);
9046         TAILQ_INSERT_HEAD(&chk->asoc->control_send_queue, chk, sctp_next);
9047         chk->asoc->ctrl_queue_cnt++;
9048         return (0);
9049 }
9050
9051 void
9052 sctp_send_heartbeat_ack(struct sctp_tcb *stcb,
9053     struct mbuf *m,
9054     int offset,
9055     int chk_length,
9056     struct sctp_nets *net)
9057 {
9058         /*
9059          * take a HB request and make it into a HB ack and send it.
9060          */
9061         struct mbuf *outchain;
9062         struct sctp_chunkhdr *chdr;
9063         struct sctp_tmit_chunk *chk;
9064
9065         if (net == NULL)
9066                 /* must have a net pointer */
9067                 return;
9068
9069         outchain = SCTP_M_COPYM(m, offset, chk_length, M_NOWAIT);
9070         if (outchain == NULL) {
9071                 /* gak out of memory */
9072                 return;
9073         }
9074 #ifdef SCTP_MBUF_LOGGING
9075         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
9076                 sctp_log_mbc(outchain, SCTP_MBUF_ICOPY);
9077         }
9078 #endif
9079         chdr = mtod(outchain, struct sctp_chunkhdr *);
9080         chdr->chunk_type = SCTP_HEARTBEAT_ACK;
9081         chdr->chunk_flags = 0;
9082         if (chk_length % 4 != 0) {
9083                 sctp_pad_lastmbuf(outchain, 4 - (chk_length % 4), NULL);
9084         }
9085         sctp_alloc_a_chunk(stcb, chk);
9086         if (chk == NULL) {
9087                 /* no memory */
9088                 sctp_m_freem(outchain);
9089                 return;
9090         }
9091         chk->copy_by_ref = 0;
9092         chk->rec.chunk_id.id = SCTP_HEARTBEAT_ACK;
9093         chk->rec.chunk_id.can_take_data = 1;
9094         chk->flags = 0;
9095         chk->send_size = chk_length;
9096         chk->sent = SCTP_DATAGRAM_UNSENT;
9097         chk->snd_count = 0;
9098         chk->asoc = &stcb->asoc;
9099         chk->data = outchain;
9100         chk->whoTo = net;
9101         atomic_add_int(&chk->whoTo->ref_count, 1);
9102         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9103         chk->asoc->ctrl_queue_cnt++;
9104 }
9105
9106 void
9107 sctp_send_cookie_ack(struct sctp_tcb *stcb)
9108 {
9109         /* formulate and queue a cookie-ack back to sender */
9110         struct mbuf *cookie_ack;
9111         struct sctp_chunkhdr *hdr;
9112         struct sctp_tmit_chunk *chk;
9113
9114         SCTP_TCB_LOCK_ASSERT(stcb);
9115
9116         cookie_ack = sctp_get_mbuf_for_msg(sizeof(struct sctp_chunkhdr), 0, M_NOWAIT, 1, MT_HEADER);
9117         if (cookie_ack == NULL) {
9118                 /* no mbuf's */
9119                 return;
9120         }
9121         SCTP_BUF_RESV_UF(cookie_ack, SCTP_MIN_OVERHEAD);
9122         sctp_alloc_a_chunk(stcb, chk);
9123         if (chk == NULL) {
9124                 /* no memory */
9125                 sctp_m_freem(cookie_ack);
9126                 return;
9127         }
9128         chk->copy_by_ref = 0;
9129         chk->rec.chunk_id.id = SCTP_COOKIE_ACK;
9130         chk->rec.chunk_id.can_take_data = 1;
9131         chk->flags = 0;
9132         chk->send_size = sizeof(struct sctp_chunkhdr);
9133         chk->sent = SCTP_DATAGRAM_UNSENT;
9134         chk->snd_count = 0;
9135         chk->asoc = &stcb->asoc;
9136         chk->data = cookie_ack;
9137         if (chk->asoc->last_control_chunk_from != NULL) {
9138                 chk->whoTo = chk->asoc->last_control_chunk_from;
9139                 atomic_add_int(&chk->whoTo->ref_count, 1);
9140         } else {
9141                 chk->whoTo = NULL;
9142         }
9143         hdr = mtod(cookie_ack, struct sctp_chunkhdr *);
9144         hdr->chunk_type = SCTP_COOKIE_ACK;
9145         hdr->chunk_flags = 0;
9146         hdr->chunk_length = htons(chk->send_size);
9147         SCTP_BUF_LEN(cookie_ack) = chk->send_size;
9148         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9149         chk->asoc->ctrl_queue_cnt++;
9150         return;
9151 }
9152
9153 void
9154 sctp_send_shutdown_ack(struct sctp_tcb *stcb, struct sctp_nets *net)
9155 {
9156         /* formulate and queue a SHUTDOWN-ACK back to the sender */
9157         struct mbuf *m_shutdown_ack;
9158         struct sctp_shutdown_ack_chunk *ack_cp;
9159         struct sctp_tmit_chunk *chk;
9160
9161         m_shutdown_ack = sctp_get_mbuf_for_msg(sizeof(struct sctp_shutdown_ack_chunk), 0, M_NOWAIT, 1, MT_HEADER);
9162         if (m_shutdown_ack == NULL) {
9163                 /* no mbuf's */
9164                 return;
9165         }
9166         SCTP_BUF_RESV_UF(m_shutdown_ack, SCTP_MIN_OVERHEAD);
9167         sctp_alloc_a_chunk(stcb, chk);
9168         if (chk == NULL) {
9169                 /* no memory */
9170                 sctp_m_freem(m_shutdown_ack);
9171                 return;
9172         }
9173         chk->copy_by_ref = 0;
9174         chk->rec.chunk_id.id = SCTP_SHUTDOWN_ACK;
9175         chk->rec.chunk_id.can_take_data = 1;
9176         chk->flags = 0;
9177         chk->send_size = sizeof(struct sctp_chunkhdr);
9178         chk->sent = SCTP_DATAGRAM_UNSENT;
9179         chk->snd_count = 0;
9180         chk->asoc = &stcb->asoc;
9181         chk->data = m_shutdown_ack;
9182         chk->whoTo = net;
9183         if (chk->whoTo) {
9184                 atomic_add_int(&chk->whoTo->ref_count, 1);
9185         }
9186         ack_cp = mtod(m_shutdown_ack, struct sctp_shutdown_ack_chunk *);
9187         ack_cp->ch.chunk_type = SCTP_SHUTDOWN_ACK;
9188         ack_cp->ch.chunk_flags = 0;
9189         ack_cp->ch.chunk_length = htons(chk->send_size);
9190         SCTP_BUF_LEN(m_shutdown_ack) = chk->send_size;
9191         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9192         chk->asoc->ctrl_queue_cnt++;
9193         return;
9194 }
9195
9196 void
9197 sctp_send_shutdown(struct sctp_tcb *stcb, struct sctp_nets *net)
9198 {
9199         /* formulate and queue a SHUTDOWN to the sender */
9200         struct mbuf *m_shutdown;
9201         struct sctp_shutdown_chunk *shutdown_cp;
9202         struct sctp_tmit_chunk *chk;
9203
9204         TAILQ_FOREACH(chk, &stcb->asoc.control_send_queue, sctp_next) {
9205                 if (chk->rec.chunk_id.id == SCTP_SHUTDOWN) {
9206                         /* We already have a SHUTDOWN queued. Reuse it. */
9207                         if (chk->whoTo) {
9208                                 sctp_free_remote_addr(chk->whoTo);
9209                                 chk->whoTo = NULL;
9210                         }
9211                         break;
9212                 }
9213         }
9214         if (chk == NULL) {
9215                 m_shutdown = sctp_get_mbuf_for_msg(sizeof(struct sctp_shutdown_chunk), 0, M_NOWAIT, 1, MT_HEADER);
9216                 if (m_shutdown == NULL) {
9217                         /* no mbuf's */
9218                         return;
9219                 }
9220                 SCTP_BUF_RESV_UF(m_shutdown, SCTP_MIN_OVERHEAD);
9221                 sctp_alloc_a_chunk(stcb, chk);
9222                 if (chk == NULL) {
9223                         /* no memory */
9224                         sctp_m_freem(m_shutdown);
9225                         return;
9226                 }
9227                 chk->copy_by_ref = 0;
9228                 chk->rec.chunk_id.id = SCTP_SHUTDOWN;
9229                 chk->rec.chunk_id.can_take_data = 1;
9230                 chk->flags = 0;
9231                 chk->send_size = sizeof(struct sctp_shutdown_chunk);
9232                 chk->sent = SCTP_DATAGRAM_UNSENT;
9233                 chk->snd_count = 0;
9234                 chk->asoc = &stcb->asoc;
9235                 chk->data = m_shutdown;
9236                 chk->whoTo = net;
9237                 if (chk->whoTo) {
9238                         atomic_add_int(&chk->whoTo->ref_count, 1);
9239                 }
9240                 shutdown_cp = mtod(m_shutdown, struct sctp_shutdown_chunk *);
9241                 shutdown_cp->ch.chunk_type = SCTP_SHUTDOWN;
9242                 shutdown_cp->ch.chunk_flags = 0;
9243                 shutdown_cp->ch.chunk_length = htons(chk->send_size);
9244                 shutdown_cp->cumulative_tsn_ack = htonl(stcb->asoc.cumulative_tsn);
9245                 SCTP_BUF_LEN(m_shutdown) = chk->send_size;
9246                 TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9247                 chk->asoc->ctrl_queue_cnt++;
9248         } else {
9249                 TAILQ_REMOVE(&stcb->asoc.control_send_queue, chk, sctp_next);
9250                 chk->whoTo = net;
9251                 if (chk->whoTo) {
9252                         atomic_add_int(&chk->whoTo->ref_count, 1);
9253                 }
9254                 shutdown_cp = mtod(chk->data, struct sctp_shutdown_chunk *);
9255                 shutdown_cp->cumulative_tsn_ack = htonl(stcb->asoc.cumulative_tsn);
9256                 TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
9257         }
9258         return;
9259 }
9260
9261 void
9262 sctp_send_asconf(struct sctp_tcb *stcb, struct sctp_nets *net, int addr_locked)
9263 {
9264         /*
9265          * formulate and queue an ASCONF to the peer. ASCONF parameters
9266          * should be queued on the assoc queue.
9267          */
9268         struct sctp_tmit_chunk *chk;
9269         struct mbuf *m_asconf;
9270         int len;
9271
9272         SCTP_TCB_LOCK_ASSERT(stcb);
9273
9274         if ((!TAILQ_EMPTY(&stcb->asoc.asconf_send_queue)) &&
9275             (!sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_MULTIPLE_ASCONFS))) {
9276                 /* can't send a new one if there is one in flight already */
9277                 return;
9278         }
9279
9280         /* compose an ASCONF chunk, maximum length is PMTU */
9281         m_asconf = sctp_compose_asconf(stcb, &len, addr_locked);
9282         if (m_asconf == NULL) {
9283                 return;
9284         }
9285
9286         sctp_alloc_a_chunk(stcb, chk);
9287         if (chk == NULL) {
9288                 /* no memory */
9289                 sctp_m_freem(m_asconf);
9290                 return;
9291         }
9292
9293         chk->copy_by_ref = 0;
9294         chk->rec.chunk_id.id = SCTP_ASCONF;
9295         chk->rec.chunk_id.can_take_data = 0;
9296         chk->flags = CHUNK_FLAGS_FRAGMENT_OK;
9297         chk->data = m_asconf;
9298         chk->send_size = len;
9299         chk->sent = SCTP_DATAGRAM_UNSENT;
9300         chk->snd_count = 0;
9301         chk->asoc = &stcb->asoc;
9302         chk->whoTo = net;
9303         if (chk->whoTo) {
9304                 atomic_add_int(&chk->whoTo->ref_count, 1);
9305         }
9306         TAILQ_INSERT_TAIL(&chk->asoc->asconf_send_queue, chk, sctp_next);
9307         chk->asoc->ctrl_queue_cnt++;
9308         return;
9309 }
9310
9311 void
9312 sctp_send_asconf_ack(struct sctp_tcb *stcb)
9313 {
9314         /*
9315          * formulate and queue a asconf-ack back to sender. the asconf-ack
9316          * must be stored in the tcb.
9317          */
9318         struct sctp_tmit_chunk *chk;
9319         struct sctp_asconf_ack *ack, *latest_ack;
9320         struct mbuf *m_ack;
9321         struct sctp_nets *net = NULL;
9322
9323         SCTP_TCB_LOCK_ASSERT(stcb);
9324         /* Get the latest ASCONF-ACK */
9325         latest_ack = TAILQ_LAST(&stcb->asoc.asconf_ack_sent, sctp_asconf_ackhead);
9326         if (latest_ack == NULL) {
9327                 return;
9328         }
9329         if (latest_ack->last_sent_to != NULL &&
9330             latest_ack->last_sent_to == stcb->asoc.last_control_chunk_from) {
9331                 /* we're doing a retransmission */
9332                 net = sctp_find_alternate_net(stcb, stcb->asoc.last_control_chunk_from, 0);
9333                 if (net == NULL) {
9334                         /* no alternate */
9335                         if (stcb->asoc.last_control_chunk_from == NULL) {
9336                                 if (stcb->asoc.alternate) {
9337                                         net = stcb->asoc.alternate;
9338                                 } else {
9339                                         net = stcb->asoc.primary_destination;
9340                                 }
9341                         } else {
9342                                 net = stcb->asoc.last_control_chunk_from;
9343                         }
9344                 }
9345         } else {
9346                 /* normal case */
9347                 if (stcb->asoc.last_control_chunk_from == NULL) {
9348                         if (stcb->asoc.alternate) {
9349                                 net = stcb->asoc.alternate;
9350                         } else {
9351                                 net = stcb->asoc.primary_destination;
9352                         }
9353                 } else {
9354                         net = stcb->asoc.last_control_chunk_from;
9355                 }
9356         }
9357         latest_ack->last_sent_to = net;
9358
9359         TAILQ_FOREACH(ack, &stcb->asoc.asconf_ack_sent, next) {
9360                 if (ack->data == NULL) {
9361                         continue;
9362                 }
9363
9364                 /* copy the asconf_ack */
9365                 m_ack = SCTP_M_COPYM(ack->data, 0, M_COPYALL, M_NOWAIT);
9366                 if (m_ack == NULL) {
9367                         /* couldn't copy it */
9368                         return;
9369                 }
9370 #ifdef SCTP_MBUF_LOGGING
9371                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
9372                         sctp_log_mbc(m_ack, SCTP_MBUF_ICOPY);
9373                 }
9374 #endif
9375
9376                 sctp_alloc_a_chunk(stcb, chk);
9377                 if (chk == NULL) {
9378                         /* no memory */
9379                         if (m_ack)
9380                                 sctp_m_freem(m_ack);
9381                         return;
9382                 }
9383                 chk->copy_by_ref = 0;
9384                 chk->rec.chunk_id.id = SCTP_ASCONF_ACK;
9385                 chk->rec.chunk_id.can_take_data = 1;
9386                 chk->flags = CHUNK_FLAGS_FRAGMENT_OK;
9387                 chk->whoTo = net;
9388                 if (chk->whoTo) {
9389                         atomic_add_int(&chk->whoTo->ref_count, 1);
9390                 }
9391                 chk->data = m_ack;
9392                 chk->send_size = ack->len;
9393                 chk->sent = SCTP_DATAGRAM_UNSENT;
9394                 chk->snd_count = 0;
9395                 chk->asoc = &stcb->asoc;
9396
9397                 TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9398                 chk->asoc->ctrl_queue_cnt++;
9399         }
9400         return;
9401 }
9402
9403 static int
9404 sctp_chunk_retransmission(struct sctp_inpcb *inp,
9405     struct sctp_tcb *stcb,
9406     struct sctp_association *asoc,
9407     int *cnt_out, struct timeval *now, int *now_filled, int *fr_done, int so_locked)
9408 {
9409         /*-
9410          * send out one MTU of retransmission. If fast_retransmit is
9411          * happening we ignore the cwnd. Otherwise we obey the cwnd and
9412          * rwnd. For a Cookie or Asconf in the control chunk queue we
9413          * retransmit them by themselves.
9414          *
9415          * For data chunks we will pick out the lowest TSN's in the sent_queue
9416          * marked for resend and bundle them all together (up to a MTU of
9417          * destination). The address to send to should have been
9418          * selected/changed where the retransmission was marked (i.e. in FR
9419          * or t3-timeout routines).
9420          */
9421         struct sctp_tmit_chunk *data_list[SCTP_MAX_DATA_BUNDLING];
9422         struct sctp_tmit_chunk *chk, *fwd;
9423         struct mbuf *m, *endofchain;
9424         struct sctp_nets *net = NULL;
9425         uint32_t tsns_sent = 0;
9426         int no_fragmentflg, bundle_at, cnt_thru;
9427         unsigned int mtu;
9428         int error, i, one_chunk, fwd_tsn, ctl_cnt, tmr_started;
9429         struct sctp_auth_chunk *auth = NULL;
9430         uint32_t auth_offset = 0;
9431         uint16_t auth_keyid;
9432         int override_ok = 1;
9433         int data_auth_reqd = 0;
9434         uint32_t dmtu = 0;
9435
9436         SCTP_TCB_LOCK_ASSERT(stcb);
9437         tmr_started = ctl_cnt = 0;
9438         no_fragmentflg = 1;
9439         fwd_tsn = 0;
9440         *cnt_out = 0;
9441         fwd = NULL;
9442         endofchain = m = NULL;
9443         auth_keyid = stcb->asoc.authinfo.active_keyid;
9444 #ifdef SCTP_AUDITING_ENABLED
9445         sctp_audit_log(0xC3, 1);
9446 #endif
9447         if ((TAILQ_EMPTY(&asoc->sent_queue)) &&
9448             (TAILQ_EMPTY(&asoc->control_send_queue))) {
9449                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "SCTP hits empty queue with cnt set to %d?\n",
9450                     asoc->sent_queue_retran_cnt);
9451                 asoc->sent_queue_cnt = 0;
9452                 asoc->sent_queue_cnt_removeable = 0;
9453                 /* send back 0/0 so we enter normal transmission */
9454                 *cnt_out = 0;
9455                 return (0);
9456         }
9457         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
9458                 if ((chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) ||
9459                     (chk->rec.chunk_id.id == SCTP_STREAM_RESET) ||
9460                     (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN)) {
9461                         if (chk->sent != SCTP_DATAGRAM_RESEND) {
9462                                 continue;
9463                         }
9464                         if (chk->rec.chunk_id.id == SCTP_STREAM_RESET) {
9465                                 if (chk != asoc->str_reset) {
9466                                         /*
9467                                          * not eligible for retran if its
9468                                          * not ours
9469                                          */
9470                                         continue;
9471                                 }
9472                         }
9473                         ctl_cnt++;
9474                         if (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN) {
9475                                 fwd_tsn = 1;
9476                         }
9477                         /*
9478                          * Add an AUTH chunk, if chunk requires it save the
9479                          * offset into the chain for AUTH
9480                          */
9481                         if ((auth == NULL) &&
9482                             (sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
9483                             stcb->asoc.peer_auth_chunks))) {
9484                                 m = sctp_add_auth_chunk(m, &endofchain,
9485                                     &auth, &auth_offset,
9486                                     stcb,
9487                                     chk->rec.chunk_id.id);
9488                                 SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
9489                         }
9490                         m = sctp_copy_mbufchain(chk->data, m, &endofchain, 0, chk->send_size, chk->copy_by_ref);
9491                         break;
9492                 }
9493         }
9494         one_chunk = 0;
9495         cnt_thru = 0;
9496         /* do we have control chunks to retransmit? */
9497         if (m != NULL) {
9498                 /* Start a timer no matter if we succeed or fail */
9499                 if (chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
9500                         sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, inp, stcb, chk->whoTo);
9501                 } else if (chk->rec.chunk_id.id == SCTP_ASCONF)
9502                         sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp, stcb, chk->whoTo);
9503                 chk->snd_count++;       /* update our count */
9504                 if ((error = sctp_lowlevel_chunk_output(inp, stcb, chk->whoTo,
9505                     (struct sockaddr *)&chk->whoTo->ro._l_addr, m,
9506                     auth_offset, auth, stcb->asoc.authinfo.active_keyid,
9507                     no_fragmentflg, 0, 0,
9508                     inp->sctp_lport, stcb->rport, htonl(stcb->asoc.peer_vtag),
9509                     chk->whoTo->port, NULL,
9510                     0, 0,
9511                     so_locked))) {
9512                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
9513                         if (error == ENOBUFS) {
9514                                 asoc->ifp_had_enobuf = 1;
9515                                 SCTP_STAT_INCR(sctps_lowlevelerr);
9516                         }
9517                         return (error);
9518                 } else {
9519                         asoc->ifp_had_enobuf = 0;
9520                 }
9521                 endofchain = NULL;
9522                 auth = NULL;
9523                 auth_offset = 0;
9524                 /*
9525                  * We don't want to mark the net->sent time here since this
9526                  * we use this for HB and retrans cannot measure RTT
9527                  */
9528                 /* (void)SCTP_GETTIME_TIMEVAL(&chk->whoTo->last_sent_time); */
9529                 *cnt_out += 1;
9530                 chk->sent = SCTP_DATAGRAM_SENT;
9531                 sctp_ucount_decr(stcb->asoc.sent_queue_retran_cnt);
9532                 if (fwd_tsn == 0) {
9533                         return (0);
9534                 } else {
9535                         /* Clean up the fwd-tsn list */
9536                         sctp_clean_up_ctl(stcb, asoc, so_locked);
9537                         return (0);
9538                 }
9539         }
9540         /*
9541          * Ok, it is just data retransmission we need to do or that and a
9542          * fwd-tsn with it all.
9543          */
9544         if (TAILQ_EMPTY(&asoc->sent_queue)) {
9545                 return (SCTP_RETRAN_DONE);
9546         }
9547         if ((SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED) ||
9548             (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_WAIT)) {
9549                 /* not yet open, resend the cookie and that is it */
9550                 return (1);
9551         }
9552 #ifdef SCTP_AUDITING_ENABLED
9553         sctp_auditing(20, inp, stcb, NULL);
9554 #endif
9555         data_auth_reqd = sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks);
9556         TAILQ_FOREACH(chk, &asoc->sent_queue, sctp_next) {
9557                 if (chk->sent != SCTP_DATAGRAM_RESEND) {
9558                         /* No, not sent to this net or not ready for rtx */
9559                         continue;
9560                 }
9561                 if (chk->data == NULL) {
9562                         SCTP_PRINTF("TSN:%x chk->snd_count:%d chk->sent:%d can't retran - no data\n",
9563                             chk->rec.data.tsn, chk->snd_count, chk->sent);
9564                         continue;
9565                 }
9566                 if ((SCTP_BASE_SYSCTL(sctp_max_retran_chunk)) &&
9567                     (chk->snd_count >= SCTP_BASE_SYSCTL(sctp_max_retran_chunk))) {
9568                         struct mbuf *op_err;
9569                         char msg[SCTP_DIAG_INFO_LEN];
9570
9571                         SCTP_SNPRINTF(msg, sizeof(msg), "TSN %8.8x retransmitted %d times, giving up",
9572                             chk->rec.data.tsn, chk->snd_count);
9573                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
9574                             msg);
9575                         atomic_add_int(&stcb->asoc.refcnt, 1);
9576                         sctp_abort_an_association(stcb->sctp_ep, stcb, op_err,
9577                             false, so_locked);
9578                         SCTP_TCB_LOCK(stcb);
9579                         atomic_subtract_int(&stcb->asoc.refcnt, 1);
9580                         return (SCTP_RETRAN_EXIT);
9581                 }
9582                 /* pick up the net */
9583                 net = chk->whoTo;
9584                 switch (net->ro._l_addr.sa.sa_family) {
9585 #ifdef INET
9586                 case AF_INET:
9587                         mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
9588                         break;
9589 #endif
9590 #ifdef INET6
9591                 case AF_INET6:
9592                         mtu = net->mtu - SCTP_MIN_OVERHEAD;
9593                         break;
9594 #endif
9595                 default:
9596                         /* TSNH */
9597                         mtu = net->mtu;
9598                         break;
9599                 }
9600
9601                 if ((asoc->peers_rwnd < mtu) && (asoc->total_flight > 0)) {
9602                         /* No room in peers rwnd */
9603                         uint32_t tsn;
9604
9605                         tsn = asoc->last_acked_seq + 1;
9606                         if (tsn == chk->rec.data.tsn) {
9607                                 /*
9608                                  * we make a special exception for this
9609                                  * case. The peer has no rwnd but is missing
9610                                  * the lowest chunk.. which is probably what
9611                                  * is holding up the rwnd.
9612                                  */
9613                                 goto one_chunk_around;
9614                         }
9615                         return (1);
9616                 }
9617 one_chunk_around:
9618                 if (asoc->peers_rwnd < mtu) {
9619                         one_chunk = 1;
9620                         if ((asoc->peers_rwnd == 0) &&
9621                             (asoc->total_flight == 0)) {
9622                                 chk->window_probe = 1;
9623                                 chk->whoTo->window_probe = 1;
9624                         }
9625                 }
9626 #ifdef SCTP_AUDITING_ENABLED
9627                 sctp_audit_log(0xC3, 2);
9628 #endif
9629                 bundle_at = 0;
9630                 m = NULL;
9631                 net->fast_retran_ip = 0;
9632                 if (chk->rec.data.doing_fast_retransmit == 0) {
9633                         /*
9634                          * if no FR in progress skip destination that have
9635                          * flight_size > cwnd.
9636                          */
9637                         if (net->flight_size >= net->cwnd) {
9638                                 continue;
9639                         }
9640                 } else {
9641                         /*
9642                          * Mark the destination net to have FR recovery
9643                          * limits put on it.
9644                          */
9645                         *fr_done = 1;
9646                         net->fast_retran_ip = 1;
9647                 }
9648
9649                 /*
9650                  * if no AUTH is yet included and this chunk requires it,
9651                  * make sure to account for it.  We don't apply the size
9652                  * until the AUTH chunk is actually added below in case
9653                  * there is no room for this chunk.
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
9660                 if ((chk->send_size <= (mtu - dmtu)) ||
9661                     (chk->flags & CHUNK_FLAGS_FRAGMENT_OK)) {
9662                         /* ok we will add this one */
9663                         if (data_auth_reqd) {
9664                                 if (auth == NULL) {
9665                                         m = sctp_add_auth_chunk(m,
9666                                             &endofchain,
9667                                             &auth,
9668                                             &auth_offset,
9669                                             stcb,
9670                                             SCTP_DATA);
9671                                         auth_keyid = chk->auth_keyid;
9672                                         override_ok = 0;
9673                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
9674                                 } else if (override_ok) {
9675                                         auth_keyid = chk->auth_keyid;
9676                                         override_ok = 0;
9677                                 } else if (chk->auth_keyid != auth_keyid) {
9678                                         /* different keyid, so done bundling */
9679                                         break;
9680                                 }
9681                         }
9682                         m = sctp_copy_mbufchain(chk->data, m, &endofchain, 0, chk->send_size, chk->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 (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
9689                                 no_fragmentflg = 0;
9690                         }
9691                         /* upate our MTU size */
9692                         if (mtu > (chk->send_size + dmtu))
9693                                 mtu -= (chk->send_size + dmtu);
9694                         else
9695                                 mtu = 0;
9696                         data_list[bundle_at++] = chk;
9697                         if (one_chunk && (asoc->total_flight <= 0)) {
9698                                 SCTP_STAT_INCR(sctps_windowprobed);
9699                         }
9700                 }
9701                 if (one_chunk == 0) {
9702                         /*
9703                          * now are there anymore forward from chk to pick
9704                          * up?
9705                          */
9706                         for (fwd = TAILQ_NEXT(chk, sctp_next); fwd != NULL; fwd = TAILQ_NEXT(fwd, sctp_next)) {
9707                                 if (fwd->sent != SCTP_DATAGRAM_RESEND) {
9708                                         /* Nope, not for retran */
9709                                         continue;
9710                                 }
9711                                 if (fwd->whoTo != net) {
9712                                         /* Nope, not the net in question */
9713                                         continue;
9714                                 }
9715                                 if (data_auth_reqd && (auth == NULL)) {
9716                                         dmtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
9717                                 } else
9718                                         dmtu = 0;
9719                                 if (fwd->send_size <= (mtu - dmtu)) {
9720                                         if (data_auth_reqd) {
9721                                                 if (auth == NULL) {
9722                                                         m = sctp_add_auth_chunk(m,
9723                                                             &endofchain,
9724                                                             &auth,
9725                                                             &auth_offset,
9726                                                             stcb,
9727                                                             SCTP_DATA);
9728                                                         auth_keyid = fwd->auth_keyid;
9729                                                         override_ok = 0;
9730                                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
9731                                                 } else if (override_ok) {
9732                                                         auth_keyid = fwd->auth_keyid;
9733                                                         override_ok = 0;
9734                                                 } else if (fwd->auth_keyid != auth_keyid) {
9735                                                         /*
9736                                                          * different keyid,
9737                                                          * so done bundling
9738                                                          */
9739                                                         break;
9740                                                 }
9741                                         }
9742                                         m = sctp_copy_mbufchain(fwd->data, m, &endofchain, 0, fwd->send_size, fwd->copy_by_ref);
9743                                         if (m == NULL) {
9744                                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
9745                                                 return (ENOMEM);
9746                                         }
9747                                         /* Do clear IP_DF ? */
9748                                         if (fwd->flags & CHUNK_FLAGS_FRAGMENT_OK) {
9749                                                 no_fragmentflg = 0;
9750                                         }
9751                                         /* upate our MTU size */
9752                                         if (mtu > (fwd->send_size + dmtu))
9753                                                 mtu -= (fwd->send_size + dmtu);
9754                                         else
9755                                                 mtu = 0;
9756                                         data_list[bundle_at++] = fwd;
9757                                         if (bundle_at >= SCTP_MAX_DATA_BUNDLING) {
9758                                                 break;
9759                                         }
9760                                 } else {
9761                                         /* can't fit so we are done */
9762                                         break;
9763                                 }
9764                         }
9765                 }
9766                 /* Is there something to send for this destination? */
9767                 if (m) {
9768                         /*
9769                          * No matter if we fail/or succeed we should start a
9770                          * timer. A failure is like a lost IP packet :-)
9771                          */
9772                         if (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
9773                                 /*
9774                                  * no timer running on this destination
9775                                  * restart it.
9776                                  */
9777                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
9778                                 tmr_started = 1;
9779                         }
9780                         /* Now lets send it, if there is anything to send :> */
9781                         if ((error = sctp_lowlevel_chunk_output(inp, stcb, net,
9782                             (struct sockaddr *)&net->ro._l_addr, m,
9783                             auth_offset, auth, auth_keyid,
9784                             no_fragmentflg, 0, 0,
9785                             inp->sctp_lport, stcb->rport, htonl(stcb->asoc.peer_vtag),
9786                             net->port, NULL,
9787                             0, 0,
9788                             so_locked))) {
9789                                 /* error, we could not output */
9790                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
9791                                 if (error == ENOBUFS) {
9792                                         asoc->ifp_had_enobuf = 1;
9793                                         SCTP_STAT_INCR(sctps_lowlevelerr);
9794                                 }
9795                                 return (error);
9796                         } else {
9797                                 asoc->ifp_had_enobuf = 0;
9798                         }
9799                         endofchain = NULL;
9800                         auth = NULL;
9801                         auth_offset = 0;
9802                         /* For HB's */
9803                         /*
9804                          * We don't want to mark the net->sent time here
9805                          * since this we use this for HB and retrans cannot
9806                          * measure RTT
9807                          */
9808                         /* (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time); */
9809
9810                         /* For auto-close */
9811                         cnt_thru++;
9812                         if (*now_filled == 0) {
9813                                 (void)SCTP_GETTIME_TIMEVAL(&asoc->time_last_sent);
9814                                 *now = asoc->time_last_sent;
9815                                 *now_filled = 1;
9816                         } else {
9817                                 asoc->time_last_sent = *now;
9818                         }
9819                         *cnt_out += bundle_at;
9820 #ifdef SCTP_AUDITING_ENABLED
9821                         sctp_audit_log(0xC4, bundle_at);
9822 #endif
9823                         if (bundle_at) {
9824                                 tsns_sent = data_list[0]->rec.data.tsn;
9825                         }
9826                         for (i = 0; i < bundle_at; i++) {
9827                                 SCTP_STAT_INCR(sctps_sendretransdata);
9828                                 data_list[i]->sent = SCTP_DATAGRAM_SENT;
9829                                 /*
9830                                  * When we have a revoked data, and we
9831                                  * retransmit it, then we clear the revoked
9832                                  * flag since this flag dictates if we
9833                                  * subtracted from the fs
9834                                  */
9835                                 if (data_list[i]->rec.data.chunk_was_revoked) {
9836                                         /* Deflate the cwnd */
9837                                         data_list[i]->whoTo->cwnd -= data_list[i]->book_size;
9838                                         data_list[i]->rec.data.chunk_was_revoked = 0;
9839                                 }
9840                                 data_list[i]->snd_count++;
9841                                 sctp_ucount_decr(asoc->sent_queue_retran_cnt);
9842                                 /* record the time */
9843                                 data_list[i]->sent_rcv_time = asoc->time_last_sent;
9844                                 if (data_list[i]->book_size_scale) {
9845                                         /*
9846                                          * need to double the book size on
9847                                          * this one
9848                                          */
9849                                         data_list[i]->book_size_scale = 0;
9850                                         /*
9851                                          * Since we double the booksize, we
9852                                          * must also double the output queue
9853                                          * size, since this get shrunk when
9854                                          * we free by this amount.
9855                                          */
9856                                         atomic_add_int(&((asoc)->total_output_queue_size), data_list[i]->book_size);
9857                                         data_list[i]->book_size *= 2;
9858                                 } else {
9859                                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_RWND_ENABLE) {
9860                                                 sctp_log_rwnd(SCTP_DECREASE_PEER_RWND,
9861                                                     asoc->peers_rwnd, data_list[i]->send_size, SCTP_BASE_SYSCTL(sctp_peer_chunk_oh));
9862                                         }
9863                                         asoc->peers_rwnd = sctp_sbspace_sub(asoc->peers_rwnd,
9864                                             (uint32_t)(data_list[i]->send_size +
9865                                             SCTP_BASE_SYSCTL(sctp_peer_chunk_oh)));
9866                                 }
9867                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
9868                                         sctp_misc_ints(SCTP_FLIGHT_LOG_UP_RSND,
9869                                             data_list[i]->whoTo->flight_size,
9870                                             data_list[i]->book_size,
9871                                             (uint32_t)(uintptr_t)data_list[i]->whoTo,
9872                                             data_list[i]->rec.data.tsn);
9873                                 }
9874                                 sctp_flight_size_increase(data_list[i]);
9875                                 sctp_total_flight_increase(stcb, data_list[i]);
9876                                 if (asoc->peers_rwnd < stcb->sctp_ep->sctp_ep.sctp_sws_sender) {
9877                                         /* SWS sender side engages */
9878                                         asoc->peers_rwnd = 0;
9879                                 }
9880                                 if ((i == 0) &&
9881                                     (data_list[i]->rec.data.doing_fast_retransmit)) {
9882                                         SCTP_STAT_INCR(sctps_sendfastretrans);
9883                                         if ((data_list[i] == TAILQ_FIRST(&asoc->sent_queue)) &&
9884                                             (tmr_started == 0)) {
9885                                                 /*-
9886                                                  * ok we just fast-retrans'd
9887                                                  * the lowest TSN, i.e the
9888                                                  * first on the list. In
9889                                                  * this case we want to give
9890                                                  * some more time to get a
9891                                                  * SACK back without a
9892                                                  * t3-expiring.
9893                                                  */
9894                                                 sctp_timer_stop(SCTP_TIMER_TYPE_SEND, inp, stcb, net,
9895                                                     SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_2);
9896                                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
9897                                         }
9898                                 }
9899                         }
9900                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
9901                                 sctp_log_cwnd(stcb, net, tsns_sent, SCTP_CWND_LOG_FROM_RESEND);
9902                         }
9903 #ifdef SCTP_AUDITING_ENABLED
9904                         sctp_auditing(21, inp, stcb, NULL);
9905 #endif
9906                 } else {
9907                         /* None will fit */
9908                         return (1);
9909                 }
9910                 if (asoc->sent_queue_retran_cnt <= 0) {
9911                         /* all done we have no more to retran */
9912                         asoc->sent_queue_retran_cnt = 0;
9913                         break;
9914                 }
9915                 if (one_chunk) {
9916                         /* No more room in rwnd */
9917                         return (1);
9918                 }
9919                 /* stop the for loop here. we sent out a packet */
9920                 break;
9921         }
9922         return (0);
9923 }
9924
9925 static void
9926 sctp_timer_validation(struct sctp_inpcb *inp,
9927     struct sctp_tcb *stcb,
9928     struct sctp_association *asoc)
9929 {
9930         struct sctp_nets *net;
9931
9932         /* Validate that a timer is running somewhere */
9933         TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
9934                 if (SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
9935                         /* Here is a timer */
9936                         return;
9937                 }
9938         }
9939         SCTP_TCB_LOCK_ASSERT(stcb);
9940         /* Gak, we did not have a timer somewhere */
9941         SCTPDBG(SCTP_DEBUG_OUTPUT3, "Deadlock avoided starting timer on a dest at retran\n");
9942         if (asoc->alternate) {
9943                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, asoc->alternate);
9944         } else {
9945                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, asoc->primary_destination);
9946         }
9947         return;
9948 }
9949
9950 void
9951 sctp_chunk_output(struct sctp_inpcb *inp,
9952     struct sctp_tcb *stcb,
9953     int from_where,
9954     int so_locked)
9955 {
9956         /*-
9957          * Ok this is the generic chunk service queue. we must do the
9958          * following:
9959          * - See if there are retransmits pending, if so we must
9960          *   do these first.
9961          * - Service the stream queue that is next, moving any
9962          *   message (note I must get a complete message i.e.
9963          *   FIRST/MIDDLE and LAST to the out queue in one pass) and assigning
9964          *   TSN's
9965          * - Check to see if the cwnd/rwnd allows any output, if so we
9966          *   go ahead and fomulate and send the low level chunks. Making sure
9967          *   to combine any control in the control chunk queue also.
9968          */
9969         struct sctp_association *asoc;
9970         struct sctp_nets *net;
9971         int error = 0, num_out, tot_out = 0, ret = 0, reason_code;
9972         unsigned int burst_cnt = 0;
9973         struct timeval now;
9974         int now_filled = 0;
9975         int nagle_on;
9976         int frag_point = sctp_get_frag_point(stcb, &stcb->asoc);
9977         int un_sent = 0;
9978         int fr_done;
9979         unsigned int tot_frs = 0;
9980
9981         asoc = &stcb->asoc;
9982 do_it_again:
9983         /* The Nagle algorithm is only applied when handling a send call. */
9984         if (from_where == SCTP_OUTPUT_FROM_USR_SEND) {
9985                 if (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_NODELAY)) {
9986                         nagle_on = 0;
9987                 } else {
9988                         nagle_on = 1;
9989                 }
9990         } else {
9991                 nagle_on = 0;
9992         }
9993         SCTP_TCB_LOCK_ASSERT(stcb);
9994
9995         un_sent = (stcb->asoc.total_output_queue_size - stcb->asoc.total_flight);
9996
9997         if ((un_sent <= 0) &&
9998             (TAILQ_EMPTY(&asoc->control_send_queue)) &&
9999             (TAILQ_EMPTY(&asoc->asconf_send_queue)) &&
10000             (asoc->sent_queue_retran_cnt == 0) &&
10001             (asoc->trigger_reset == 0)) {
10002                 /* Nothing to do unless there is something to be sent left */
10003                 return;
10004         }
10005         /*
10006          * Do we have something to send, data or control AND a sack timer
10007          * running, if so piggy-back the sack.
10008          */
10009         if (SCTP_OS_TIMER_PENDING(&stcb->asoc.dack_timer.timer)) {
10010                 sctp_send_sack(stcb, so_locked);
10011                 sctp_timer_stop(SCTP_TIMER_TYPE_RECV, stcb->sctp_ep, stcb, NULL,
10012                     SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_3);
10013         }
10014         while (asoc->sent_queue_retran_cnt) {
10015                 /*-
10016                  * Ok, it is retransmission time only, we send out only ONE
10017                  * packet with a single call off to the retran code.
10018                  */
10019                 if (from_where == SCTP_OUTPUT_FROM_COOKIE_ACK) {
10020                         /*-
10021                          * Special hook for handling cookiess discarded
10022                          * by peer that carried data. Send cookie-ack only
10023                          * and then the next call with get the retran's.
10024                          */
10025                         (void)sctp_med_chunk_output(inp, stcb, asoc, &num_out, &reason_code, 1,
10026                             from_where,
10027                             &now, &now_filled, frag_point, so_locked);
10028                         return;
10029                 } else if (from_where != SCTP_OUTPUT_FROM_HB_TMR) {
10030                         /* if its not from a HB then do it */
10031                         fr_done = 0;
10032                         ret = sctp_chunk_retransmission(inp, stcb, asoc, &num_out, &now, &now_filled, &fr_done, so_locked);
10033                         if (fr_done) {
10034                                 tot_frs++;
10035                         }
10036                 } else {
10037                         /*
10038                          * its from any other place, we don't allow retran
10039                          * output (only control)
10040                          */
10041                         ret = 1;
10042                 }
10043                 if (ret > 0) {
10044                         /* Can't send anymore */
10045                         /*-
10046                          * now lets push out control by calling med-level
10047                          * output once. this assures that we WILL send HB's
10048                          * if queued too.
10049                          */
10050                         (void)sctp_med_chunk_output(inp, stcb, asoc, &num_out, &reason_code, 1,
10051                             from_where,
10052                             &now, &now_filled, frag_point, so_locked);
10053 #ifdef SCTP_AUDITING_ENABLED
10054                         sctp_auditing(8, inp, stcb, NULL);
10055 #endif
10056                         sctp_timer_validation(inp, stcb, asoc);
10057                         return;
10058                 }
10059                 if (ret < 0) {
10060                         /*-
10061                          * The count was off.. retran is not happening so do
10062                          * the normal retransmission.
10063                          */
10064 #ifdef SCTP_AUDITING_ENABLED
10065                         sctp_auditing(9, inp, stcb, NULL);
10066 #endif
10067                         if (ret == SCTP_RETRAN_EXIT) {
10068                                 return;
10069                         }
10070                         break;
10071                 }
10072                 if (from_where == SCTP_OUTPUT_FROM_T3) {
10073                         /* Only one transmission allowed out of a timeout */
10074 #ifdef SCTP_AUDITING_ENABLED
10075                         sctp_auditing(10, inp, stcb, NULL);
10076 #endif
10077                         /* Push out any control */
10078                         (void)sctp_med_chunk_output(inp, stcb, asoc, &num_out, &reason_code, 1, from_where,
10079                             &now, &now_filled, frag_point, so_locked);
10080                         return;
10081                 }
10082                 if ((asoc->fr_max_burst > 0) && (tot_frs >= asoc->fr_max_burst)) {
10083                         /* Hit FR burst limit */
10084                         return;
10085                 }
10086                 if ((num_out == 0) && (ret == 0)) {
10087                         /* No more retrans to send */
10088                         break;
10089                 }
10090         }
10091 #ifdef SCTP_AUDITING_ENABLED
10092         sctp_auditing(12, inp, stcb, NULL);
10093 #endif
10094         /* Check for bad destinations, if they exist move chunks around. */
10095         TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
10096                 if (!(net->dest_state & SCTP_ADDR_REACHABLE)) {
10097                         /*-
10098                          * if possible move things off of this address we
10099                          * still may send below due to the dormant state but
10100                          * we try to find an alternate address to send to
10101                          * and if we have one we move all queued data on the
10102                          * out wheel to this alternate address.
10103                          */
10104                         if (net->ref_count > 1)
10105                                 sctp_move_chunks_from_net(stcb, net);
10106                 } else {
10107                         /*-
10108                          * if ((asoc->sat_network) || (net->addr_is_local))
10109                          * { burst_limit = asoc->max_burst *
10110                          * SCTP_SAT_NETWORK_BURST_INCR; }
10111                          */
10112                         if (asoc->max_burst > 0) {
10113                                 if (SCTP_BASE_SYSCTL(sctp_use_cwnd_based_maxburst)) {
10114                                         if ((net->flight_size + (asoc->max_burst * net->mtu)) < net->cwnd) {
10115                                                 /*
10116                                                  * JRS - Use the congestion
10117                                                  * control given in the
10118                                                  * congestion control module
10119                                                  */
10120                                                 asoc->cc_functions.sctp_cwnd_update_after_output(stcb, net, asoc->max_burst);
10121                                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_MAXBURST_ENABLE) {
10122                                                         sctp_log_maxburst(stcb, net, 0, asoc->max_burst, SCTP_MAX_BURST_APPLIED);
10123                                                 }
10124                                                 SCTP_STAT_INCR(sctps_maxburstqueued);
10125                                         }
10126                                         net->fast_retran_ip = 0;
10127                                 } else {
10128                                         if (net->flight_size == 0) {
10129                                                 /*
10130                                                  * Should be decaying the
10131                                                  * cwnd here
10132                                                  */
10133                                                 ;
10134                                         }
10135                                 }
10136                         }
10137                 }
10138         }
10139         burst_cnt = 0;
10140         do {
10141                 error = sctp_med_chunk_output(inp, stcb, asoc, &num_out,
10142                     &reason_code, 0, from_where,
10143                     &now, &now_filled, frag_point, so_locked);
10144                 if (error) {
10145                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Error %d was returned from med-c-op\n", error);
10146                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_MAXBURST_ENABLE) {
10147                                 sctp_log_maxburst(stcb, asoc->primary_destination, error, burst_cnt, SCTP_MAX_BURST_ERROR_STOP);
10148                         }
10149                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
10150                                 sctp_log_cwnd(stcb, NULL, error, SCTP_SEND_NOW_COMPLETES);
10151                                 sctp_log_cwnd(stcb, NULL, 0xdeadbeef, SCTP_SEND_NOW_COMPLETES);
10152                         }
10153                         break;
10154                 }
10155                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "m-c-o put out %d\n", num_out);
10156
10157                 tot_out += num_out;
10158                 burst_cnt++;
10159                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
10160                         sctp_log_cwnd(stcb, NULL, num_out, SCTP_SEND_NOW_COMPLETES);
10161                         if (num_out == 0) {
10162                                 sctp_log_cwnd(stcb, NULL, reason_code, SCTP_SEND_NOW_COMPLETES);
10163                         }
10164                 }
10165                 if (nagle_on) {
10166                         /*
10167                          * When the Nagle algorithm is used, look at how
10168                          * much is unsent, then if its smaller than an MTU
10169                          * and we have data in flight we stop, except if we
10170                          * are handling a fragmented user message.
10171                          */
10172                         un_sent = stcb->asoc.total_output_queue_size - stcb->asoc.total_flight;
10173                         if ((un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD)) &&
10174                             (stcb->asoc.total_flight > 0)) {
10175 /*      &&                   sctp_is_feature_on(inp, SCTP_PCB_FLAGS_EXPLICIT_EOR))) {*/
10176                                 break;
10177                         }
10178                 }
10179                 if (TAILQ_EMPTY(&asoc->control_send_queue) &&
10180                     TAILQ_EMPTY(&asoc->send_queue) &&
10181                     sctp_is_there_unsent_data(stcb, so_locked) == 0) {
10182                         /* Nothing left to send */
10183                         break;
10184                 }
10185                 if ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) <= 0) {
10186                         /* Nothing left to send */
10187                         break;
10188                 }
10189         } while (num_out &&
10190             ((asoc->max_burst == 0) ||
10191             SCTP_BASE_SYSCTL(sctp_use_cwnd_based_maxburst) ||
10192             (burst_cnt < asoc->max_burst)));
10193
10194         if (SCTP_BASE_SYSCTL(sctp_use_cwnd_based_maxburst) == 0) {
10195                 if ((asoc->max_burst > 0) && (burst_cnt >= asoc->max_burst)) {
10196                         SCTP_STAT_INCR(sctps_maxburstqueued);
10197                         asoc->burst_limit_applied = 1;
10198                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_MAXBURST_ENABLE) {
10199                                 sctp_log_maxburst(stcb, asoc->primary_destination, 0, burst_cnt, SCTP_MAX_BURST_APPLIED);
10200                         }
10201                 } else {
10202                         asoc->burst_limit_applied = 0;
10203                 }
10204         }
10205         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
10206                 sctp_log_cwnd(stcb, NULL, tot_out, SCTP_SEND_NOW_COMPLETES);
10207         }
10208         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Ok, we have put out %d chunks\n",
10209             tot_out);
10210
10211         /*-
10212          * Now we need to clean up the control chunk chain if a ECNE is on
10213          * it. It must be marked as UNSENT again so next call will continue
10214          * to send it until such time that we get a CWR, to remove it.
10215          */
10216         if (stcb->asoc.ecn_echo_cnt_onq)
10217                 sctp_fix_ecn_echo(asoc);
10218
10219         if (stcb->asoc.trigger_reset) {
10220                 if (sctp_send_stream_reset_out_if_possible(stcb, so_locked) == 0) {
10221                         goto do_it_again;
10222                 }
10223         }
10224         return;
10225 }
10226
10227 int
10228 sctp_output(
10229     struct sctp_inpcb *inp,
10230     struct mbuf *m,
10231     struct sockaddr *addr,
10232     struct mbuf *control,
10233     struct thread *p,
10234     int flags)
10235 {
10236         if (inp == NULL) {
10237                 SCTP_LTRACE_ERR_RET_PKT(m, inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
10238                 return (EINVAL);
10239         }
10240
10241         if (inp->sctp_socket == NULL) {
10242                 SCTP_LTRACE_ERR_RET_PKT(m, inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
10243                 return (EINVAL);
10244         }
10245         return (sctp_sosend(inp->sctp_socket,
10246             addr,
10247             (struct uio *)NULL,
10248             m,
10249             control,
10250             flags, p
10251             ));
10252 }
10253
10254 void
10255 send_forward_tsn(struct sctp_tcb *stcb,
10256     struct sctp_association *asoc)
10257 {
10258         struct sctp_tmit_chunk *chk, *at, *tp1, *last;
10259         struct sctp_forward_tsn_chunk *fwdtsn;
10260         struct sctp_strseq *strseq;
10261         struct sctp_strseq_mid *strseq_m;
10262         uint32_t advance_peer_ack_point;
10263         unsigned int cnt_of_space, i, ovh;
10264         unsigned int space_needed;
10265         unsigned int cnt_of_skipped = 0;
10266
10267         SCTP_TCB_LOCK_ASSERT(stcb);
10268         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
10269                 if (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN) {
10270                         /* mark it to unsent */
10271                         chk->sent = SCTP_DATAGRAM_UNSENT;
10272                         chk->snd_count = 0;
10273                         /* Do we correct its output location? */
10274                         if (chk->whoTo) {
10275                                 sctp_free_remote_addr(chk->whoTo);
10276                                 chk->whoTo = NULL;
10277                         }
10278                         goto sctp_fill_in_rest;
10279                 }
10280         }
10281         /* Ok if we reach here we must build one */
10282         sctp_alloc_a_chunk(stcb, chk);
10283         if (chk == NULL) {
10284                 return;
10285         }
10286         asoc->fwd_tsn_cnt++;
10287         chk->copy_by_ref = 0;
10288         /*
10289          * We don't do the old thing here since this is used not for on-wire
10290          * but to tell if we are sending a fwd-tsn by the stack during
10291          * output. And if its a IFORWARD or a FORWARD it is a fwd-tsn.
10292          */
10293         chk->rec.chunk_id.id = SCTP_FORWARD_CUM_TSN;
10294         chk->rec.chunk_id.can_take_data = 0;
10295         chk->flags = 0;
10296         chk->asoc = asoc;
10297         chk->whoTo = NULL;
10298         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
10299         if (chk->data == NULL) {
10300                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
10301                 return;
10302         }
10303         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
10304         chk->sent = SCTP_DATAGRAM_UNSENT;
10305         chk->snd_count = 0;
10306         TAILQ_INSERT_TAIL(&asoc->control_send_queue, chk, sctp_next);
10307         asoc->ctrl_queue_cnt++;
10308 sctp_fill_in_rest:
10309         /*-
10310          * Here we go through and fill out the part that deals with
10311          * stream/seq of the ones we skip.
10312          */
10313         SCTP_BUF_LEN(chk->data) = 0;
10314         TAILQ_FOREACH(at, &asoc->sent_queue, sctp_next) {
10315                 if ((at->sent != SCTP_FORWARD_TSN_SKIP) &&
10316                     (at->sent != SCTP_DATAGRAM_NR_ACKED)) {
10317                         /* no more to look at */
10318                         break;
10319                 }
10320                 if (!asoc->idata_supported && (at->rec.data.rcv_flags & SCTP_DATA_UNORDERED)) {
10321                         /* We don't report these */
10322                         continue;
10323                 }
10324                 cnt_of_skipped++;
10325         }
10326         if (asoc->idata_supported) {
10327                 space_needed = (sizeof(struct sctp_forward_tsn_chunk) +
10328                     (cnt_of_skipped * sizeof(struct sctp_strseq_mid)));
10329         } else {
10330                 space_needed = (sizeof(struct sctp_forward_tsn_chunk) +
10331                     (cnt_of_skipped * sizeof(struct sctp_strseq)));
10332         }
10333         cnt_of_space = (unsigned int)M_TRAILINGSPACE(chk->data);
10334
10335         if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
10336                 ovh = SCTP_MIN_OVERHEAD;
10337         } else {
10338                 ovh = SCTP_MIN_V4_OVERHEAD;
10339         }
10340         if (cnt_of_space > (asoc->smallest_mtu - ovh)) {
10341                 /* trim to a mtu size */
10342                 cnt_of_space = asoc->smallest_mtu - ovh;
10343         }
10344         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_TRY_ADVANCE) {
10345                 sctp_misc_ints(SCTP_FWD_TSN_CHECK,
10346                     0xff, 0, cnt_of_skipped,
10347                     asoc->advanced_peer_ack_point);
10348         }
10349         advance_peer_ack_point = asoc->advanced_peer_ack_point;
10350         if (cnt_of_space < space_needed) {
10351                 /*-
10352                  * ok we must trim down the chunk by lowering the
10353                  * advance peer ack point.
10354                  */
10355                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_TRY_ADVANCE) {
10356                         sctp_misc_ints(SCTP_FWD_TSN_CHECK,
10357                             0xff, 0xff, cnt_of_space,
10358                             space_needed);
10359                 }
10360                 cnt_of_skipped = cnt_of_space - sizeof(struct sctp_forward_tsn_chunk);
10361                 if (asoc->idata_supported) {
10362                         cnt_of_skipped /= sizeof(struct sctp_strseq_mid);
10363                 } else {
10364                         cnt_of_skipped /= sizeof(struct sctp_strseq);
10365                 }
10366                 /*-
10367                  * Go through and find the TSN that will be the one
10368                  * we report.
10369                  */
10370                 at = TAILQ_FIRST(&asoc->sent_queue);
10371                 if (at != NULL) {
10372                         for (i = 0; i < cnt_of_skipped; i++) {
10373                                 tp1 = TAILQ_NEXT(at, sctp_next);
10374                                 if (tp1 == NULL) {
10375                                         break;
10376                                 }
10377                                 at = tp1;
10378                         }
10379                 }
10380                 if (at && SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_TRY_ADVANCE) {
10381                         sctp_misc_ints(SCTP_FWD_TSN_CHECK,
10382                             0xff, cnt_of_skipped, at->rec.data.tsn,
10383                             asoc->advanced_peer_ack_point);
10384                 }
10385                 last = at;
10386                 /*-
10387                  * last now points to last one I can report, update
10388                  * peer ack point
10389                  */
10390                 if (last) {
10391                         advance_peer_ack_point = last->rec.data.tsn;
10392                 }
10393                 if (asoc->idata_supported) {
10394                         space_needed = sizeof(struct sctp_forward_tsn_chunk) +
10395                             cnt_of_skipped * sizeof(struct sctp_strseq_mid);
10396                 } else {
10397                         space_needed = sizeof(struct sctp_forward_tsn_chunk) +
10398                             cnt_of_skipped * sizeof(struct sctp_strseq);
10399                 }
10400         }
10401         chk->send_size = space_needed;
10402         /* Setup the chunk */
10403         fwdtsn = mtod(chk->data, struct sctp_forward_tsn_chunk *);
10404         fwdtsn->ch.chunk_length = htons(chk->send_size);
10405         fwdtsn->ch.chunk_flags = 0;
10406         if (asoc->idata_supported) {
10407                 fwdtsn->ch.chunk_type = SCTP_IFORWARD_CUM_TSN;
10408         } else {
10409                 fwdtsn->ch.chunk_type = SCTP_FORWARD_CUM_TSN;
10410         }
10411         fwdtsn->new_cumulative_tsn = htonl(advance_peer_ack_point);
10412         SCTP_BUF_LEN(chk->data) = chk->send_size;
10413         fwdtsn++;
10414         /*-
10415          * Move pointer to after the fwdtsn and transfer to the
10416          * strseq pointer.
10417          */
10418         if (asoc->idata_supported) {
10419                 strseq_m = (struct sctp_strseq_mid *)fwdtsn;
10420                 strseq = NULL;
10421         } else {
10422                 strseq = (struct sctp_strseq *)fwdtsn;
10423                 strseq_m = NULL;
10424         }
10425         /*-
10426          * Now populate the strseq list. This is done blindly
10427          * without pulling out duplicate stream info. This is
10428          * inefficent but won't harm the process since the peer will
10429          * look at these in sequence and will thus release anything.
10430          * It could mean we exceed the PMTU and chop off some that
10431          * we could have included.. but this is unlikely (aka 1432/4
10432          * would mean 300+ stream seq's would have to be reported in
10433          * one FWD-TSN. With a bit of work we can later FIX this to
10434          * optimize and pull out duplicates.. but it does add more
10435          * overhead. So for now... not!
10436          */
10437         i = 0;
10438         TAILQ_FOREACH(at, &asoc->sent_queue, sctp_next) {
10439                 if (i >= cnt_of_skipped) {
10440                         break;
10441                 }
10442                 if (!asoc->idata_supported && (at->rec.data.rcv_flags & SCTP_DATA_UNORDERED)) {
10443                         /* We don't report these */
10444                         continue;
10445                 }
10446                 if (at->rec.data.tsn == advance_peer_ack_point) {
10447                         at->rec.data.fwd_tsn_cnt = 0;
10448                 }
10449                 if (asoc->idata_supported) {
10450                         strseq_m->sid = htons(at->rec.data.sid);
10451                         if (at->rec.data.rcv_flags & SCTP_DATA_UNORDERED) {
10452                                 strseq_m->flags = htons(PR_SCTP_UNORDERED_FLAG);
10453                         } else {
10454                                 strseq_m->flags = 0;
10455                         }
10456                         strseq_m->mid = htonl(at->rec.data.mid);
10457                         strseq_m++;
10458                 } else {
10459                         strseq->sid = htons(at->rec.data.sid);
10460                         strseq->ssn = htons((uint16_t)at->rec.data.mid);
10461                         strseq++;
10462                 }
10463                 i++;
10464         }
10465         return;
10466 }
10467
10468 void
10469 sctp_send_sack(struct sctp_tcb *stcb, int so_locked)
10470 {
10471         /*-
10472          * Queue up a SACK or NR-SACK in the control queue.
10473          * We must first check to see if a SACK or NR-SACK is
10474          * somehow on the control queue.
10475          * If so, we will take and and remove the old one.
10476          */
10477         struct sctp_association *asoc;
10478         struct sctp_tmit_chunk *chk, *a_chk;
10479         struct sctp_sack_chunk *sack;
10480         struct sctp_nr_sack_chunk *nr_sack;
10481         struct sctp_gap_ack_block *gap_descriptor;
10482         const struct sack_track *selector;
10483         int mergeable = 0;
10484         int offset;
10485         caddr_t limit;
10486         uint32_t *dup;
10487         int limit_reached = 0;
10488         unsigned int i, siz, j;
10489         unsigned int num_gap_blocks = 0, num_nr_gap_blocks = 0, space;
10490         int num_dups = 0;
10491         int space_req;
10492         uint32_t highest_tsn;
10493         uint8_t flags;
10494         uint8_t type;
10495         uint8_t tsn_map;
10496
10497         if (stcb->asoc.nrsack_supported == 1) {
10498                 type = SCTP_NR_SELECTIVE_ACK;
10499         } else {
10500                 type = SCTP_SELECTIVE_ACK;
10501         }
10502         a_chk = NULL;
10503         asoc = &stcb->asoc;
10504         SCTP_TCB_LOCK_ASSERT(stcb);
10505         if (asoc->last_data_chunk_from == NULL) {
10506                 /* Hmm we never received anything */
10507                 return;
10508         }
10509         sctp_slide_mapping_arrays(stcb);
10510         sctp_set_rwnd(stcb, asoc);
10511         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
10512                 if (chk->rec.chunk_id.id == type) {
10513                         /* Hmm, found a sack already on queue, remove it */
10514                         TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
10515                         asoc->ctrl_queue_cnt--;
10516                         a_chk = chk;
10517                         if (a_chk->data) {
10518                                 sctp_m_freem(a_chk->data);
10519                                 a_chk->data = NULL;
10520                         }
10521                         if (a_chk->whoTo) {
10522                                 sctp_free_remote_addr(a_chk->whoTo);
10523                                 a_chk->whoTo = NULL;
10524                         }
10525                         break;
10526                 }
10527         }
10528         if (a_chk == NULL) {
10529                 sctp_alloc_a_chunk(stcb, a_chk);
10530                 if (a_chk == NULL) {
10531                         /* No memory so we drop the idea, and set a timer */
10532                         if (stcb->asoc.delayed_ack) {
10533                                 sctp_timer_stop(SCTP_TIMER_TYPE_RECV,
10534                                     stcb->sctp_ep, stcb, NULL,
10535                                     SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_4);
10536                                 sctp_timer_start(SCTP_TIMER_TYPE_RECV,
10537                                     stcb->sctp_ep, stcb, NULL);
10538                         } else {
10539                                 stcb->asoc.send_sack = 1;
10540                         }
10541                         return;
10542                 }
10543                 a_chk->copy_by_ref = 0;
10544                 a_chk->rec.chunk_id.id = type;
10545                 a_chk->rec.chunk_id.can_take_data = 1;
10546         }
10547         /* Clear our pkt counts */
10548         asoc->data_pkts_seen = 0;
10549
10550         a_chk->flags = 0;
10551         a_chk->asoc = asoc;
10552         a_chk->snd_count = 0;
10553         a_chk->send_size = 0;   /* fill in later */
10554         a_chk->sent = SCTP_DATAGRAM_UNSENT;
10555         a_chk->whoTo = NULL;
10556
10557         if (!(asoc->last_data_chunk_from->dest_state & SCTP_ADDR_REACHABLE)) {
10558                 /*-
10559                  * Ok, the destination for the SACK is unreachable, lets see if
10560                  * we can select an alternate to asoc->last_data_chunk_from
10561                  */
10562                 a_chk->whoTo = sctp_find_alternate_net(stcb, asoc->last_data_chunk_from, 0);
10563                 if (a_chk->whoTo == NULL) {
10564                         /* Nope, no alternate */
10565                         a_chk->whoTo = asoc->last_data_chunk_from;
10566                 }
10567         } else {
10568                 a_chk->whoTo = asoc->last_data_chunk_from;
10569         }
10570         if (a_chk->whoTo) {
10571                 atomic_add_int(&a_chk->whoTo->ref_count, 1);
10572         }
10573         if (SCTP_TSN_GT(asoc->highest_tsn_inside_map, asoc->highest_tsn_inside_nr_map)) {
10574                 highest_tsn = asoc->highest_tsn_inside_map;
10575         } else {
10576                 highest_tsn = asoc->highest_tsn_inside_nr_map;
10577         }
10578         if (highest_tsn == asoc->cumulative_tsn) {
10579                 /* no gaps */
10580                 if (type == SCTP_SELECTIVE_ACK) {
10581                         space_req = sizeof(struct sctp_sack_chunk);
10582                 } else {
10583                         space_req = sizeof(struct sctp_nr_sack_chunk);
10584                 }
10585         } else {
10586                 /* gaps get a cluster */
10587                 space_req = MCLBYTES;
10588         }
10589         /* Ok now lets formulate a MBUF with our sack */
10590         a_chk->data = sctp_get_mbuf_for_msg(space_req, 0, M_NOWAIT, 1, MT_DATA);
10591         if ((a_chk->data == NULL) ||
10592             (a_chk->whoTo == NULL)) {
10593                 /* rats, no mbuf memory */
10594                 if (a_chk->data) {
10595                         /* was a problem with the destination */
10596                         sctp_m_freem(a_chk->data);
10597                         a_chk->data = NULL;
10598                 }
10599                 sctp_free_a_chunk(stcb, a_chk, so_locked);
10600                 /* sa_ignore NO_NULL_CHK */
10601                 if (stcb->asoc.delayed_ack) {
10602                         sctp_timer_stop(SCTP_TIMER_TYPE_RECV,
10603                             stcb->sctp_ep, stcb, NULL,
10604                             SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_5);
10605                         sctp_timer_start(SCTP_TIMER_TYPE_RECV,
10606                             stcb->sctp_ep, stcb, NULL);
10607                 } else {
10608                         stcb->asoc.send_sack = 1;
10609                 }
10610                 return;
10611         }
10612         /* ok, lets go through and fill it in */
10613         SCTP_BUF_RESV_UF(a_chk->data, SCTP_MIN_OVERHEAD);
10614         space = (unsigned int)M_TRAILINGSPACE(a_chk->data);
10615         if (space > (a_chk->whoTo->mtu - SCTP_MIN_OVERHEAD)) {
10616                 space = (a_chk->whoTo->mtu - SCTP_MIN_OVERHEAD);
10617         }
10618         limit = mtod(a_chk->data, caddr_t);
10619         limit += space;
10620
10621         flags = 0;
10622
10623         if ((asoc->sctp_cmt_on_off > 0) &&
10624             SCTP_BASE_SYSCTL(sctp_cmt_use_dac)) {
10625                 /*-
10626                  * CMT DAC algorithm: If 2 (i.e., 0x10) packets have been
10627                  * received, then set high bit to 1, else 0. Reset
10628                  * pkts_rcvd.
10629                  */
10630                 flags |= (asoc->cmt_dac_pkts_rcvd << 6);
10631                 asoc->cmt_dac_pkts_rcvd = 0;
10632         }
10633 #ifdef SCTP_ASOCLOG_OF_TSNS
10634         stcb->asoc.cumack_logsnt[stcb->asoc.cumack_log_atsnt] = asoc->cumulative_tsn;
10635         stcb->asoc.cumack_log_atsnt++;
10636         if (stcb->asoc.cumack_log_atsnt >= SCTP_TSN_LOG_SIZE) {
10637                 stcb->asoc.cumack_log_atsnt = 0;
10638         }
10639 #endif
10640         /* reset the readers interpretation */
10641         stcb->freed_by_sorcv_sincelast = 0;
10642
10643         if (type == SCTP_SELECTIVE_ACK) {
10644                 sack = mtod(a_chk->data, struct sctp_sack_chunk *);
10645                 nr_sack = NULL;
10646                 gap_descriptor = (struct sctp_gap_ack_block *)((caddr_t)sack + sizeof(struct sctp_sack_chunk));
10647                 if (highest_tsn > asoc->mapping_array_base_tsn) {
10648                         siz = (((highest_tsn - asoc->mapping_array_base_tsn) + 1) + 7) / 8;
10649                 } else {
10650                         siz = (((MAX_TSN - asoc->mapping_array_base_tsn) + 1) + highest_tsn + 7) / 8;
10651                 }
10652         } else {
10653                 sack = NULL;
10654                 nr_sack = mtod(a_chk->data, struct sctp_nr_sack_chunk *);
10655                 gap_descriptor = (struct sctp_gap_ack_block *)((caddr_t)nr_sack + sizeof(struct sctp_nr_sack_chunk));
10656                 if (asoc->highest_tsn_inside_map > asoc->mapping_array_base_tsn) {
10657                         siz = (((asoc->highest_tsn_inside_map - asoc->mapping_array_base_tsn) + 1) + 7) / 8;
10658                 } else {
10659                         siz = (((MAX_TSN - asoc->mapping_array_base_tsn) + 1) + asoc->highest_tsn_inside_map + 7) / 8;
10660                 }
10661         }
10662
10663         if (SCTP_TSN_GT(asoc->mapping_array_base_tsn, asoc->cumulative_tsn)) {
10664                 offset = 1;
10665         } else {
10666                 offset = asoc->mapping_array_base_tsn - asoc->cumulative_tsn;
10667         }
10668         if (((type == SCTP_SELECTIVE_ACK) &&
10669             SCTP_TSN_GT(highest_tsn, asoc->cumulative_tsn)) ||
10670             ((type == SCTP_NR_SELECTIVE_ACK) &&
10671             SCTP_TSN_GT(asoc->highest_tsn_inside_map, asoc->cumulative_tsn))) {
10672                 /* we have a gap .. maybe */
10673                 for (i = 0; i < siz; i++) {
10674                         tsn_map = asoc->mapping_array[i];
10675                         if (type == SCTP_SELECTIVE_ACK) {
10676                                 tsn_map |= asoc->nr_mapping_array[i];
10677                         }
10678                         if (i == 0) {
10679                                 /*
10680                                  * Clear all bits corresponding to TSNs
10681                                  * smaller or equal to the cumulative TSN.
10682                                  */
10683                                 tsn_map &= (~0U << (1 - offset));
10684                         }
10685                         selector = &sack_array[tsn_map];
10686                         if (mergeable && selector->right_edge) {
10687                                 /*
10688                                  * Backup, left and right edges were ok to
10689                                  * merge.
10690                                  */
10691                                 num_gap_blocks--;
10692                                 gap_descriptor--;
10693                         }
10694                         if (selector->num_entries == 0)
10695                                 mergeable = 0;
10696                         else {
10697                                 for (j = 0; j < selector->num_entries; j++) {
10698                                         if (mergeable && selector->right_edge) {
10699                                                 /*
10700                                                  * do a merge by NOT setting
10701                                                  * the left side
10702                                                  */
10703                                                 mergeable = 0;
10704                                         } else {
10705                                                 /*
10706                                                  * no merge, set the left
10707                                                  * side
10708                                                  */
10709                                                 mergeable = 0;
10710                                                 gap_descriptor->start = htons((selector->gaps[j].start + offset));
10711                                         }
10712                                         gap_descriptor->end = htons((selector->gaps[j].end + offset));
10713                                         num_gap_blocks++;
10714                                         gap_descriptor++;
10715                                         if (((caddr_t)gap_descriptor + sizeof(struct sctp_gap_ack_block)) > limit) {
10716                                                 /* no more room */
10717                                                 limit_reached = 1;
10718                                                 break;
10719                                         }
10720                                 }
10721                                 if (selector->left_edge) {
10722                                         mergeable = 1;
10723                                 }
10724                         }
10725                         if (limit_reached) {
10726                                 /* Reached the limit stop */
10727                                 break;
10728                         }
10729                         offset += 8;
10730                 }
10731         }
10732         if ((type == SCTP_NR_SELECTIVE_ACK) &&
10733             (limit_reached == 0)) {
10734                 mergeable = 0;
10735
10736                 if (asoc->highest_tsn_inside_nr_map > asoc->mapping_array_base_tsn) {
10737                         siz = (((asoc->highest_tsn_inside_nr_map - asoc->mapping_array_base_tsn) + 1) + 7) / 8;
10738                 } else {
10739                         siz = (((MAX_TSN - asoc->mapping_array_base_tsn) + 1) + asoc->highest_tsn_inside_nr_map + 7) / 8;
10740                 }
10741
10742                 if (SCTP_TSN_GT(asoc->mapping_array_base_tsn, asoc->cumulative_tsn)) {
10743                         offset = 1;
10744                 } else {
10745                         offset = asoc->mapping_array_base_tsn - asoc->cumulative_tsn;
10746                 }
10747                 if (SCTP_TSN_GT(asoc->highest_tsn_inside_nr_map, asoc->cumulative_tsn)) {
10748                         /* we have a gap .. maybe */
10749                         for (i = 0; i < siz; i++) {
10750                                 tsn_map = asoc->nr_mapping_array[i];
10751                                 if (i == 0) {
10752                                         /*
10753                                          * Clear all bits corresponding to
10754                                          * TSNs smaller or equal to the
10755                                          * cumulative TSN.
10756                                          */
10757                                         tsn_map &= (~0U << (1 - offset));
10758                                 }
10759                                 selector = &sack_array[tsn_map];
10760                                 if (mergeable && selector->right_edge) {
10761                                         /*
10762                                          * Backup, left and right edges were
10763                                          * ok to merge.
10764                                          */
10765                                         num_nr_gap_blocks--;
10766                                         gap_descriptor--;
10767                                 }
10768                                 if (selector->num_entries == 0)
10769                                         mergeable = 0;
10770                                 else {
10771                                         for (j = 0; j < selector->num_entries; j++) {
10772                                                 if (mergeable && selector->right_edge) {
10773                                                         /*
10774                                                          * do a merge by NOT
10775                                                          * setting the left
10776                                                          * side
10777                                                          */
10778                                                         mergeable = 0;
10779                                                 } else {
10780                                                         /*
10781                                                          * no merge, set the
10782                                                          * left side
10783                                                          */
10784                                                         mergeable = 0;
10785                                                         gap_descriptor->start = htons((selector->gaps[j].start + offset));
10786                                                 }
10787                                                 gap_descriptor->end = htons((selector->gaps[j].end + offset));
10788                                                 num_nr_gap_blocks++;
10789                                                 gap_descriptor++;
10790                                                 if (((caddr_t)gap_descriptor + sizeof(struct sctp_gap_ack_block)) > limit) {
10791                                                         /* no more room */
10792                                                         limit_reached = 1;
10793                                                         break;
10794                                                 }
10795                                         }
10796                                         if (selector->left_edge) {
10797                                                 mergeable = 1;
10798                                         }
10799                                 }
10800                                 if (limit_reached) {
10801                                         /* Reached the limit stop */
10802                                         break;
10803                                 }
10804                                 offset += 8;
10805                         }
10806                 }
10807         }
10808         /* now we must add any dups we are going to report. */
10809         if ((limit_reached == 0) && (asoc->numduptsns)) {
10810                 dup = (uint32_t *)gap_descriptor;
10811                 for (i = 0; i < asoc->numduptsns; i++) {
10812                         *dup = htonl(asoc->dup_tsns[i]);
10813                         dup++;
10814                         num_dups++;
10815                         if (((caddr_t)dup + sizeof(uint32_t)) > limit) {
10816                                 /* no more room */
10817                                 break;
10818                         }
10819                 }
10820                 asoc->numduptsns = 0;
10821         }
10822         /*
10823          * now that the chunk is prepared queue it to the control chunk
10824          * queue.
10825          */
10826         if (type == SCTP_SELECTIVE_ACK) {
10827                 a_chk->send_size = (uint16_t)(sizeof(struct sctp_sack_chunk) +
10828                     (num_gap_blocks + num_nr_gap_blocks) * sizeof(struct sctp_gap_ack_block) +
10829                     num_dups * sizeof(int32_t));
10830                 SCTP_BUF_LEN(a_chk->data) = a_chk->send_size;
10831                 sack->sack.cum_tsn_ack = htonl(asoc->cumulative_tsn);
10832                 sack->sack.a_rwnd = htonl(asoc->my_rwnd);
10833                 sack->sack.num_gap_ack_blks = htons(num_gap_blocks);
10834                 sack->sack.num_dup_tsns = htons(num_dups);
10835                 sack->ch.chunk_type = type;
10836                 sack->ch.chunk_flags = flags;
10837                 sack->ch.chunk_length = htons(a_chk->send_size);
10838         } else {
10839                 a_chk->send_size = (uint16_t)(sizeof(struct sctp_nr_sack_chunk) +
10840                     (num_gap_blocks + num_nr_gap_blocks) * sizeof(struct sctp_gap_ack_block) +
10841                     num_dups * sizeof(int32_t));
10842                 SCTP_BUF_LEN(a_chk->data) = a_chk->send_size;
10843                 nr_sack->nr_sack.cum_tsn_ack = htonl(asoc->cumulative_tsn);
10844                 nr_sack->nr_sack.a_rwnd = htonl(asoc->my_rwnd);
10845                 nr_sack->nr_sack.num_gap_ack_blks = htons(num_gap_blocks);
10846                 nr_sack->nr_sack.num_nr_gap_ack_blks = htons(num_nr_gap_blocks);
10847                 nr_sack->nr_sack.num_dup_tsns = htons(num_dups);
10848                 nr_sack->nr_sack.reserved = 0;
10849                 nr_sack->ch.chunk_type = type;
10850                 nr_sack->ch.chunk_flags = flags;
10851                 nr_sack->ch.chunk_length = htons(a_chk->send_size);
10852         }
10853         TAILQ_INSERT_TAIL(&asoc->control_send_queue, a_chk, sctp_next);
10854         asoc->my_last_reported_rwnd = asoc->my_rwnd;
10855         asoc->ctrl_queue_cnt++;
10856         asoc->send_sack = 0;
10857         SCTP_STAT_INCR(sctps_sendsacks);
10858         return;
10859 }
10860
10861 void
10862 sctp_send_abort_tcb(struct sctp_tcb *stcb, struct mbuf *operr, int so_locked)
10863 {
10864         struct mbuf *m_abort, *m, *m_last;
10865         struct mbuf *m_out, *m_end = NULL;
10866         struct sctp_abort_chunk *abort;
10867         struct sctp_auth_chunk *auth = NULL;
10868         struct sctp_nets *net;
10869         uint32_t vtag;
10870         uint32_t auth_offset = 0;
10871         int error;
10872         uint16_t cause_len, chunk_len, padding_len;
10873
10874         SCTP_TCB_LOCK_ASSERT(stcb);
10875         /*-
10876          * Add an AUTH chunk, if chunk requires it and save the offset into
10877          * the chain for AUTH
10878          */
10879         if (sctp_auth_is_required_chunk(SCTP_ABORT_ASSOCIATION,
10880             stcb->asoc.peer_auth_chunks)) {
10881                 m_out = sctp_add_auth_chunk(NULL, &m_end, &auth, &auth_offset,
10882                     stcb, SCTP_ABORT_ASSOCIATION);
10883                 SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
10884         } else {
10885                 m_out = NULL;
10886         }
10887         m_abort = sctp_get_mbuf_for_msg(sizeof(struct sctp_abort_chunk), 0, M_NOWAIT, 1, MT_HEADER);
10888         if (m_abort == NULL) {
10889                 if (m_out) {
10890                         sctp_m_freem(m_out);
10891                 }
10892                 if (operr) {
10893                         sctp_m_freem(operr);
10894                 }
10895                 return;
10896         }
10897         /* link in any error */
10898         SCTP_BUF_NEXT(m_abort) = operr;
10899         cause_len = 0;
10900         m_last = NULL;
10901         for (m = operr; m; m = SCTP_BUF_NEXT(m)) {
10902                 cause_len += (uint16_t)SCTP_BUF_LEN(m);
10903                 if (SCTP_BUF_NEXT(m) == NULL) {
10904                         m_last = m;
10905                 }
10906         }
10907         SCTP_BUF_LEN(m_abort) = sizeof(struct sctp_abort_chunk);
10908         chunk_len = (uint16_t)sizeof(struct sctp_abort_chunk) + cause_len;
10909         padding_len = SCTP_SIZE32(chunk_len) - chunk_len;
10910         if (m_out == NULL) {
10911                 /* NO Auth chunk prepended, so reserve space in front */
10912                 SCTP_BUF_RESV_UF(m_abort, SCTP_MIN_OVERHEAD);
10913                 m_out = m_abort;
10914         } else {
10915                 /* Put AUTH chunk at the front of the chain */
10916                 SCTP_BUF_NEXT(m_end) = m_abort;
10917         }
10918         if (stcb->asoc.alternate) {
10919                 net = stcb->asoc.alternate;
10920         } else {
10921                 net = stcb->asoc.primary_destination;
10922         }
10923         /* Fill in the ABORT chunk header. */
10924         abort = mtod(m_abort, struct sctp_abort_chunk *);
10925         abort->ch.chunk_type = SCTP_ABORT_ASSOCIATION;
10926         if (stcb->asoc.peer_vtag == 0) {
10927                 /* This happens iff the assoc is in COOKIE-WAIT state. */
10928                 vtag = stcb->asoc.my_vtag;
10929                 abort->ch.chunk_flags = SCTP_HAD_NO_TCB;
10930         } else {
10931                 vtag = stcb->asoc.peer_vtag;
10932                 abort->ch.chunk_flags = 0;
10933         }
10934         abort->ch.chunk_length = htons(chunk_len);
10935         /* Add padding, if necessary. */
10936         if (padding_len > 0) {
10937                 if ((m_last == NULL) ||
10938                     (sctp_add_pad_tombuf(m_last, padding_len) == NULL)) {
10939                         sctp_m_freem(m_out);
10940                         return;
10941                 }
10942         }
10943         if ((error = sctp_lowlevel_chunk_output(stcb->sctp_ep, stcb, net,
10944             (struct sockaddr *)&net->ro._l_addr,
10945             m_out, auth_offset, auth, stcb->asoc.authinfo.active_keyid, 1, 0, 0,
10946             stcb->sctp_ep->sctp_lport, stcb->rport, htonl(vtag),
10947             stcb->asoc.primary_destination->port, NULL,
10948             0, 0,
10949             so_locked))) {
10950                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
10951                 if (error == ENOBUFS) {
10952                         stcb->asoc.ifp_had_enobuf = 1;
10953                         SCTP_STAT_INCR(sctps_lowlevelerr);
10954                 }
10955         } else {
10956                 stcb->asoc.ifp_had_enobuf = 0;
10957         }
10958         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
10959 }
10960
10961 void
10962 sctp_send_shutdown_complete(struct sctp_tcb *stcb,
10963     struct sctp_nets *net,
10964     int reflect_vtag)
10965 {
10966         /* formulate and SEND a SHUTDOWN-COMPLETE */
10967         struct mbuf *m_shutdown_comp;
10968         struct sctp_shutdown_complete_chunk *shutdown_complete;
10969         uint32_t vtag;
10970         int error;
10971         uint8_t flags;
10972
10973         m_shutdown_comp = sctp_get_mbuf_for_msg(sizeof(struct sctp_chunkhdr), 0, M_NOWAIT, 1, MT_HEADER);
10974         if (m_shutdown_comp == NULL) {
10975                 /* no mbuf's */
10976                 return;
10977         }
10978         if (reflect_vtag) {
10979                 flags = SCTP_HAD_NO_TCB;
10980                 vtag = stcb->asoc.my_vtag;
10981         } else {
10982                 flags = 0;
10983                 vtag = stcb->asoc.peer_vtag;
10984         }
10985         shutdown_complete = mtod(m_shutdown_comp, struct sctp_shutdown_complete_chunk *);
10986         shutdown_complete->ch.chunk_type = SCTP_SHUTDOWN_COMPLETE;
10987         shutdown_complete->ch.chunk_flags = flags;
10988         shutdown_complete->ch.chunk_length = htons(sizeof(struct sctp_shutdown_complete_chunk));
10989         SCTP_BUF_LEN(m_shutdown_comp) = sizeof(struct sctp_shutdown_complete_chunk);
10990         if ((error = sctp_lowlevel_chunk_output(stcb->sctp_ep, stcb, net,
10991             (struct sockaddr *)&net->ro._l_addr,
10992             m_shutdown_comp, 0, NULL, 0, 1, 0, 0,
10993             stcb->sctp_ep->sctp_lport, stcb->rport,
10994             htonl(vtag),
10995             net->port, NULL,
10996             0, 0,
10997             SCTP_SO_NOT_LOCKED))) {
10998                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
10999                 if (error == ENOBUFS) {
11000                         stcb->asoc.ifp_had_enobuf = 1;
11001                         SCTP_STAT_INCR(sctps_lowlevelerr);
11002                 }
11003         } else {
11004                 stcb->asoc.ifp_had_enobuf = 0;
11005         }
11006         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
11007         return;
11008 }
11009
11010 static void
11011 sctp_send_resp_msg(struct sockaddr *src, struct sockaddr *dst,
11012     struct sctphdr *sh, uint32_t vtag,
11013     uint8_t type, struct mbuf *cause,
11014     uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum,
11015     uint32_t vrf_id, uint16_t port)
11016 {
11017         struct mbuf *o_pak;
11018         struct mbuf *mout;
11019         struct sctphdr *shout;
11020         struct sctp_chunkhdr *ch;
11021 #if defined(INET) || defined(INET6)
11022         struct udphdr *udp;
11023 #endif
11024         int ret, len, cause_len, padding_len;
11025 #ifdef INET
11026         struct sockaddr_in *src_sin, *dst_sin;
11027         struct ip *ip;
11028 #endif
11029 #ifdef INET6
11030         struct sockaddr_in6 *src_sin6, *dst_sin6;
11031         struct ip6_hdr *ip6;
11032 #endif
11033
11034         /* Compute the length of the cause and add final padding. */
11035         cause_len = 0;
11036         if (cause != NULL) {
11037                 struct mbuf *m_at, *m_last = NULL;
11038
11039                 for (m_at = cause; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
11040                         if (SCTP_BUF_NEXT(m_at) == NULL)
11041                                 m_last = m_at;
11042                         cause_len += SCTP_BUF_LEN(m_at);
11043                 }
11044                 padding_len = cause_len % 4;
11045                 if (padding_len != 0) {
11046                         padding_len = 4 - padding_len;
11047                 }
11048                 if (padding_len != 0) {
11049                         if (sctp_add_pad_tombuf(m_last, padding_len) == NULL) {
11050                                 sctp_m_freem(cause);
11051                                 return;
11052                         }
11053                 }
11054         } else {
11055                 padding_len = 0;
11056         }
11057         /* Get an mbuf for the header. */
11058         len = sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
11059         switch (dst->sa_family) {
11060 #ifdef INET
11061         case AF_INET:
11062                 len += sizeof(struct ip);
11063                 break;
11064 #endif
11065 #ifdef INET6
11066         case AF_INET6:
11067                 len += sizeof(struct ip6_hdr);
11068                 break;
11069 #endif
11070         default:
11071                 break;
11072         }
11073 #if defined(INET) || defined(INET6)
11074         if (port) {
11075                 len += sizeof(struct udphdr);
11076         }
11077 #endif
11078         mout = sctp_get_mbuf_for_msg(len + max_linkhdr, 1, M_NOWAIT, 1, MT_DATA);
11079         if (mout == NULL) {
11080                 if (cause) {
11081                         sctp_m_freem(cause);
11082                 }
11083                 return;
11084         }
11085         SCTP_BUF_RESV_UF(mout, max_linkhdr);
11086         SCTP_BUF_LEN(mout) = len;
11087         SCTP_BUF_NEXT(mout) = cause;
11088         M_SETFIB(mout, fibnum);
11089         mout->m_pkthdr.flowid = mflowid;
11090         M_HASHTYPE_SET(mout, mflowtype);
11091 #ifdef INET
11092         ip = NULL;
11093 #endif
11094 #ifdef INET6
11095         ip6 = NULL;
11096 #endif
11097         switch (dst->sa_family) {
11098 #ifdef INET
11099         case AF_INET:
11100                 src_sin = (struct sockaddr_in *)src;
11101                 dst_sin = (struct sockaddr_in *)dst;
11102                 ip = mtod(mout, struct ip *);
11103                 ip->ip_v = IPVERSION;
11104                 ip->ip_hl = (sizeof(struct ip) >> 2);
11105                 ip->ip_tos = 0;
11106                 ip->ip_off = htons(IP_DF);
11107                 ip_fillid(ip);
11108                 ip->ip_ttl = MODULE_GLOBAL(ip_defttl);
11109                 if (port) {
11110                         ip->ip_p = IPPROTO_UDP;
11111                 } else {
11112                         ip->ip_p = IPPROTO_SCTP;
11113                 }
11114                 ip->ip_src.s_addr = dst_sin->sin_addr.s_addr;
11115                 ip->ip_dst.s_addr = src_sin->sin_addr.s_addr;
11116                 ip->ip_sum = 0;
11117                 len = sizeof(struct ip);
11118                 shout = (struct sctphdr *)((caddr_t)ip + len);
11119                 break;
11120 #endif
11121 #ifdef INET6
11122         case AF_INET6:
11123                 src_sin6 = (struct sockaddr_in6 *)src;
11124                 dst_sin6 = (struct sockaddr_in6 *)dst;
11125                 ip6 = mtod(mout, struct ip6_hdr *);
11126                 ip6->ip6_flow = htonl(0x60000000);
11127                 if (V_ip6_auto_flowlabel) {
11128                         ip6->ip6_flow |= (htonl(ip6_randomflowlabel()) & IPV6_FLOWLABEL_MASK);
11129                 }
11130                 ip6->ip6_hlim = MODULE_GLOBAL(ip6_defhlim);
11131                 if (port) {
11132                         ip6->ip6_nxt = IPPROTO_UDP;
11133                 } else {
11134                         ip6->ip6_nxt = IPPROTO_SCTP;
11135                 }
11136                 ip6->ip6_src = dst_sin6->sin6_addr;
11137                 ip6->ip6_dst = src_sin6->sin6_addr;
11138                 len = sizeof(struct ip6_hdr);
11139                 shout = (struct sctphdr *)((caddr_t)ip6 + len);
11140                 break;
11141 #endif
11142         default:
11143                 len = 0;
11144                 shout = mtod(mout, struct sctphdr *);
11145                 break;
11146         }
11147 #if defined(INET) || defined(INET6)
11148         if (port) {
11149                 if (htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port)) == 0) {
11150                         sctp_m_freem(mout);
11151                         return;
11152                 }
11153                 udp = (struct udphdr *)shout;
11154                 udp->uh_sport = htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port));
11155                 udp->uh_dport = port;
11156                 udp->uh_sum = 0;
11157                 udp->uh_ulen = htons((uint16_t)(sizeof(struct udphdr) +
11158                     sizeof(struct sctphdr) +
11159                     sizeof(struct sctp_chunkhdr) +
11160                     cause_len + padding_len));
11161                 len += sizeof(struct udphdr);
11162                 shout = (struct sctphdr *)((caddr_t)shout + sizeof(struct udphdr));
11163         } else {
11164                 udp = NULL;
11165         }
11166 #endif
11167         shout->src_port = sh->dest_port;
11168         shout->dest_port = sh->src_port;
11169         shout->checksum = 0;
11170         if (vtag) {
11171                 shout->v_tag = htonl(vtag);
11172         } else {
11173                 shout->v_tag = sh->v_tag;
11174         }
11175         len += sizeof(struct sctphdr);
11176         ch = (struct sctp_chunkhdr *)((caddr_t)shout + sizeof(struct sctphdr));
11177         ch->chunk_type = type;
11178         if (vtag) {
11179                 ch->chunk_flags = 0;
11180         } else {
11181                 ch->chunk_flags = SCTP_HAD_NO_TCB;
11182         }
11183         ch->chunk_length = htons((uint16_t)(sizeof(struct sctp_chunkhdr) + cause_len));
11184         len += sizeof(struct sctp_chunkhdr);
11185         len += cause_len + padding_len;
11186
11187         if (SCTP_GET_HEADER_FOR_OUTPUT(o_pak)) {
11188                 sctp_m_freem(mout);
11189                 return;
11190         }
11191         SCTP_ATTACH_CHAIN(o_pak, mout, len);
11192         switch (dst->sa_family) {
11193 #ifdef INET
11194         case AF_INET:
11195                 if (port) {
11196                         if (V_udp_cksum) {
11197                                 udp->uh_sum = in_pseudo(ip->ip_src.s_addr, ip->ip_dst.s_addr, udp->uh_ulen + htons(IPPROTO_UDP));
11198                         } else {
11199                                 udp->uh_sum = 0;
11200                         }
11201                 }
11202                 ip->ip_len = htons(len);
11203                 if (port) {
11204                         shout->checksum = sctp_calculate_cksum(mout, sizeof(struct ip) + sizeof(struct udphdr));
11205                         SCTP_STAT_INCR(sctps_sendswcrc);
11206                         if (V_udp_cksum) {
11207                                 SCTP_ENABLE_UDP_CSUM(o_pak);
11208                         }
11209                 } else {
11210                         mout->m_pkthdr.csum_flags = CSUM_SCTP;
11211                         mout->m_pkthdr.csum_data = offsetof(struct sctphdr, checksum);
11212                         SCTP_STAT_INCR(sctps_sendhwcrc);
11213                 }
11214 #ifdef SCTP_PACKET_LOGGING
11215                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING) {
11216                         sctp_packet_log(o_pak);
11217                 }
11218 #endif
11219                 SCTP_PROBE5(send, NULL, NULL, ip, NULL, shout);
11220                 SCTP_IP_OUTPUT(ret, o_pak, NULL, NULL, vrf_id);
11221                 break;
11222 #endif
11223 #ifdef INET6
11224         case AF_INET6:
11225                 ip6->ip6_plen = htons((uint16_t)(len - sizeof(struct ip6_hdr)));
11226                 if (port) {
11227                         shout->checksum = sctp_calculate_cksum(mout, sizeof(struct ip6_hdr) + sizeof(struct udphdr));
11228                         SCTP_STAT_INCR(sctps_sendswcrc);
11229                         if ((udp->uh_sum = in6_cksum(o_pak, IPPROTO_UDP, sizeof(struct ip6_hdr), len - sizeof(struct ip6_hdr))) == 0) {
11230                                 udp->uh_sum = 0xffff;
11231                         }
11232                 } else {
11233                         mout->m_pkthdr.csum_flags = CSUM_SCTP_IPV6;
11234                         mout->m_pkthdr.csum_data = offsetof(struct sctphdr, checksum);
11235                         SCTP_STAT_INCR(sctps_sendhwcrc);
11236                 }
11237 #ifdef SCTP_PACKET_LOGGING
11238                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING) {
11239                         sctp_packet_log(o_pak);
11240                 }
11241 #endif
11242                 SCTP_PROBE5(send, NULL, NULL, ip6, NULL, shout);
11243                 SCTP_IP6_OUTPUT(ret, o_pak, NULL, NULL, NULL, vrf_id);
11244                 break;
11245 #endif
11246         default:
11247                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Unknown protocol (TSNH) type %d\n",
11248                     dst->sa_family);
11249                 sctp_m_freem(mout);
11250                 SCTP_LTRACE_ERR_RET_PKT(mout, NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EFAULT);
11251                 return;
11252         }
11253         SCTPDBG(SCTP_DEBUG_OUTPUT3, "return from send is %d\n", ret);
11254         if (port) {
11255                 UDPSTAT_INC(udps_opackets);
11256         }
11257         SCTP_STAT_INCR(sctps_sendpackets);
11258         SCTP_STAT_INCR_COUNTER64(sctps_outpackets);
11259         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
11260         if (ret) {
11261                 SCTP_STAT_INCR(sctps_senderrors);
11262         }
11263         return;
11264 }
11265
11266 void
11267 sctp_send_shutdown_complete2(struct sockaddr *src, struct sockaddr *dst,
11268     struct sctphdr *sh,
11269     uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum,
11270     uint32_t vrf_id, uint16_t port)
11271 {
11272         sctp_send_resp_msg(src, dst, sh, 0, SCTP_SHUTDOWN_COMPLETE, NULL,
11273             mflowtype, mflowid, fibnum,
11274             vrf_id, port);
11275 }
11276
11277 void
11278 sctp_send_hb(struct sctp_tcb *stcb, struct sctp_nets *net, int so_locked)
11279 {
11280         struct sctp_tmit_chunk *chk;
11281         struct sctp_heartbeat_chunk *hb;
11282         struct timeval now;
11283
11284         SCTP_TCB_LOCK_ASSERT(stcb);
11285         if (net == NULL) {
11286                 return;
11287         }
11288         (void)SCTP_GETTIME_TIMEVAL(&now);
11289         switch (net->ro._l_addr.sa.sa_family) {
11290 #ifdef INET
11291         case AF_INET:
11292                 break;
11293 #endif
11294 #ifdef INET6
11295         case AF_INET6:
11296                 break;
11297 #endif
11298         default:
11299                 return;
11300         }
11301         sctp_alloc_a_chunk(stcb, chk);
11302         if (chk == NULL) {
11303                 SCTPDBG(SCTP_DEBUG_OUTPUT4, "Gak, can't get a chunk for hb\n");
11304                 return;
11305         }
11306
11307         chk->copy_by_ref = 0;
11308         chk->rec.chunk_id.id = SCTP_HEARTBEAT_REQUEST;
11309         chk->rec.chunk_id.can_take_data = 1;
11310         chk->flags = 0;
11311         chk->asoc = &stcb->asoc;
11312         chk->send_size = sizeof(struct sctp_heartbeat_chunk);
11313
11314         chk->data = sctp_get_mbuf_for_msg(chk->send_size, 0, M_NOWAIT, 1, MT_HEADER);
11315         if (chk->data == NULL) {
11316                 sctp_free_a_chunk(stcb, chk, so_locked);
11317                 return;
11318         }
11319         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11320         SCTP_BUF_LEN(chk->data) = chk->send_size;
11321         chk->sent = SCTP_DATAGRAM_UNSENT;
11322         chk->snd_count = 0;
11323         chk->whoTo = net;
11324         atomic_add_int(&chk->whoTo->ref_count, 1);
11325         /* Now we have a mbuf that we can fill in with the details */
11326         hb = mtod(chk->data, struct sctp_heartbeat_chunk *);
11327         memset(hb, 0, sizeof(struct sctp_heartbeat_chunk));
11328         /* fill out chunk header */
11329         hb->ch.chunk_type = SCTP_HEARTBEAT_REQUEST;
11330         hb->ch.chunk_flags = 0;
11331         hb->ch.chunk_length = htons(chk->send_size);
11332         /* Fill out hb parameter */
11333         hb->heartbeat.hb_info.ph.param_type = htons(SCTP_HEARTBEAT_INFO);
11334         hb->heartbeat.hb_info.ph.param_length = htons(sizeof(struct sctp_heartbeat_info_param));
11335         hb->heartbeat.hb_info.time_value_1 = (uint32_t)now.tv_sec;
11336         hb->heartbeat.hb_info.time_value_2 = now.tv_usec;
11337         /* Did our user request this one, put it in */
11338         hb->heartbeat.hb_info.addr_family = (uint8_t)net->ro._l_addr.sa.sa_family;
11339         hb->heartbeat.hb_info.addr_len = net->ro._l_addr.sa.sa_len;
11340         if (net->dest_state & SCTP_ADDR_UNCONFIRMED) {
11341                 /*
11342                  * we only take from the entropy pool if the address is not
11343                  * confirmed.
11344                  */
11345                 net->heartbeat_random1 = hb->heartbeat.hb_info.random_value1 = sctp_select_initial_TSN(&stcb->sctp_ep->sctp_ep);
11346                 net->heartbeat_random2 = hb->heartbeat.hb_info.random_value2 = sctp_select_initial_TSN(&stcb->sctp_ep->sctp_ep);
11347         } else {
11348                 net->heartbeat_random1 = hb->heartbeat.hb_info.random_value1 = 0;
11349                 net->heartbeat_random2 = hb->heartbeat.hb_info.random_value2 = 0;
11350         }
11351         switch (net->ro._l_addr.sa.sa_family) {
11352 #ifdef INET
11353         case AF_INET:
11354                 memcpy(hb->heartbeat.hb_info.address,
11355                     &net->ro._l_addr.sin.sin_addr,
11356                     sizeof(net->ro._l_addr.sin.sin_addr));
11357                 break;
11358 #endif
11359 #ifdef INET6
11360         case AF_INET6:
11361                 memcpy(hb->heartbeat.hb_info.address,
11362                     &net->ro._l_addr.sin6.sin6_addr,
11363                     sizeof(net->ro._l_addr.sin6.sin6_addr));
11364                 break;
11365 #endif
11366         default:
11367                 if (chk->data) {
11368                         sctp_m_freem(chk->data);
11369                         chk->data = NULL;
11370                 }
11371                 sctp_free_a_chunk(stcb, chk, so_locked);
11372                 return;
11373                 break;
11374         }
11375         net->hb_responded = 0;
11376         TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
11377         stcb->asoc.ctrl_queue_cnt++;
11378         SCTP_STAT_INCR(sctps_sendheartbeat);
11379         return;
11380 }
11381
11382 void
11383 sctp_send_ecn_echo(struct sctp_tcb *stcb, struct sctp_nets *net,
11384     uint32_t high_tsn)
11385 {
11386         struct sctp_association *asoc;
11387         struct sctp_ecne_chunk *ecne;
11388         struct sctp_tmit_chunk *chk;
11389
11390         if (net == NULL) {
11391                 return;
11392         }
11393         asoc = &stcb->asoc;
11394         SCTP_TCB_LOCK_ASSERT(stcb);
11395         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
11396                 if ((chk->rec.chunk_id.id == SCTP_ECN_ECHO) && (net == chk->whoTo)) {
11397                         /* found a previous ECN_ECHO update it if needed */
11398                         uint32_t cnt, ctsn;
11399
11400                         ecne = mtod(chk->data, struct sctp_ecne_chunk *);
11401                         ctsn = ntohl(ecne->tsn);
11402                         if (SCTP_TSN_GT(high_tsn, ctsn)) {
11403                                 ecne->tsn = htonl(high_tsn);
11404                                 SCTP_STAT_INCR(sctps_queue_upd_ecne);
11405                         }
11406                         cnt = ntohl(ecne->num_pkts_since_cwr);
11407                         cnt++;
11408                         ecne->num_pkts_since_cwr = htonl(cnt);
11409                         return;
11410                 }
11411         }
11412         /* nope could not find one to update so we must build one */
11413         sctp_alloc_a_chunk(stcb, chk);
11414         if (chk == NULL) {
11415                 return;
11416         }
11417         SCTP_STAT_INCR(sctps_queue_upd_ecne);
11418         chk->copy_by_ref = 0;
11419         chk->rec.chunk_id.id = SCTP_ECN_ECHO;
11420         chk->rec.chunk_id.can_take_data = 0;
11421         chk->flags = 0;
11422         chk->asoc = &stcb->asoc;
11423         chk->send_size = sizeof(struct sctp_ecne_chunk);
11424         chk->data = sctp_get_mbuf_for_msg(chk->send_size, 0, M_NOWAIT, 1, MT_HEADER);
11425         if (chk->data == NULL) {
11426                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
11427                 return;
11428         }
11429         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11430         SCTP_BUF_LEN(chk->data) = chk->send_size;
11431         chk->sent = SCTP_DATAGRAM_UNSENT;
11432         chk->snd_count = 0;
11433         chk->whoTo = net;
11434         atomic_add_int(&chk->whoTo->ref_count, 1);
11435
11436         stcb->asoc.ecn_echo_cnt_onq++;
11437         ecne = mtod(chk->data, struct sctp_ecne_chunk *);
11438         ecne->ch.chunk_type = SCTP_ECN_ECHO;
11439         ecne->ch.chunk_flags = 0;
11440         ecne->ch.chunk_length = htons(sizeof(struct sctp_ecne_chunk));
11441         ecne->tsn = htonl(high_tsn);
11442         ecne->num_pkts_since_cwr = htonl(1);
11443         TAILQ_INSERT_HEAD(&stcb->asoc.control_send_queue, chk, sctp_next);
11444         asoc->ctrl_queue_cnt++;
11445 }
11446
11447 void
11448 sctp_send_packet_dropped(struct sctp_tcb *stcb, struct sctp_nets *net,
11449     struct mbuf *m, int len, int iphlen, int bad_crc)
11450 {
11451         struct sctp_association *asoc;
11452         struct sctp_pktdrop_chunk *drp;
11453         struct sctp_tmit_chunk *chk;
11454         uint8_t *datap;
11455         int was_trunc = 0;
11456         int fullsz = 0;
11457         long spc;
11458         int offset;
11459         struct sctp_chunkhdr *ch, chunk_buf;
11460         unsigned int chk_length;
11461
11462         if (!stcb) {
11463                 return;
11464         }
11465         asoc = &stcb->asoc;
11466         SCTP_TCB_LOCK_ASSERT(stcb);
11467         if (asoc->pktdrop_supported == 0) {
11468                 /*-
11469                  * peer must declare support before I send one.
11470                  */
11471                 return;
11472         }
11473         if (stcb->sctp_socket == NULL) {
11474                 return;
11475         }
11476         sctp_alloc_a_chunk(stcb, chk);
11477         if (chk == NULL) {
11478                 return;
11479         }
11480         chk->copy_by_ref = 0;
11481         chk->rec.chunk_id.id = SCTP_PACKET_DROPPED;
11482         chk->rec.chunk_id.can_take_data = 1;
11483         chk->flags = 0;
11484         len -= iphlen;
11485         chk->send_size = len;
11486         /* Validate that we do not have an ABORT in here. */
11487         offset = iphlen + sizeof(struct sctphdr);
11488         ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, offset,
11489             sizeof(*ch), (uint8_t *)&chunk_buf);
11490         while (ch != NULL) {
11491                 chk_length = ntohs(ch->chunk_length);
11492                 if (chk_length < sizeof(*ch)) {
11493                         /* break to abort land */
11494                         break;
11495                 }
11496                 switch (ch->chunk_type) {
11497                 case SCTP_PACKET_DROPPED:
11498                 case SCTP_ABORT_ASSOCIATION:
11499                 case SCTP_INITIATION_ACK:
11500                         /**
11501                          * We don't respond with an PKT-DROP to an ABORT
11502                          * or PKT-DROP. We also do not respond to an
11503                          * INIT-ACK, because we can't know if the initiation
11504                          * tag is correct or not.
11505                          */
11506                         sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
11507                         return;
11508                 default:
11509                         break;
11510                 }
11511                 offset += SCTP_SIZE32(chk_length);
11512                 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, offset,
11513                     sizeof(*ch), (uint8_t *)&chunk_buf);
11514         }
11515
11516         if ((len + SCTP_MAX_OVERHEAD + sizeof(struct sctp_pktdrop_chunk)) >
11517             min(stcb->asoc.smallest_mtu, MCLBYTES)) {
11518                 /*
11519                  * only send 1 mtu worth, trim off the excess on the end.
11520                  */
11521                 fullsz = len;
11522                 len = min(stcb->asoc.smallest_mtu, MCLBYTES) - SCTP_MAX_OVERHEAD;
11523                 was_trunc = 1;
11524         }
11525         chk->asoc = &stcb->asoc;
11526         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
11527         if (chk->data == NULL) {
11528 jump_out:
11529                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
11530                 return;
11531         }
11532         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11533         drp = mtod(chk->data, struct sctp_pktdrop_chunk *);
11534         if (drp == NULL) {
11535                 sctp_m_freem(chk->data);
11536                 chk->data = NULL;
11537                 goto jump_out;
11538         }
11539         chk->book_size = SCTP_SIZE32((chk->send_size + sizeof(struct sctp_pktdrop_chunk) +
11540             sizeof(struct sctphdr) + SCTP_MED_OVERHEAD));
11541         chk->book_size_scale = 0;
11542         if (was_trunc) {
11543                 drp->ch.chunk_flags = SCTP_PACKET_TRUNCATED;
11544                 drp->trunc_len = htons(fullsz);
11545                 /*
11546                  * Len is already adjusted to size minus overhead above take
11547                  * out the pkt_drop chunk itself from it.
11548                  */
11549                 chk->send_size = (uint16_t)(len - sizeof(struct sctp_pktdrop_chunk));
11550                 len = chk->send_size;
11551         } else {
11552                 /* no truncation needed */
11553                 drp->ch.chunk_flags = 0;
11554                 drp->trunc_len = htons(0);
11555         }
11556         if (bad_crc) {
11557                 drp->ch.chunk_flags |= SCTP_BADCRC;
11558         }
11559         chk->send_size += sizeof(struct sctp_pktdrop_chunk);
11560         SCTP_BUF_LEN(chk->data) = chk->send_size;
11561         chk->sent = SCTP_DATAGRAM_UNSENT;
11562         chk->snd_count = 0;
11563         if (net) {
11564                 /* we should hit here */
11565                 chk->whoTo = net;
11566                 atomic_add_int(&chk->whoTo->ref_count, 1);
11567         } else {
11568                 chk->whoTo = NULL;
11569         }
11570         drp->ch.chunk_type = SCTP_PACKET_DROPPED;
11571         drp->ch.chunk_length = htons(chk->send_size);
11572         spc = SCTP_SB_LIMIT_RCV(stcb->sctp_socket);
11573         if (spc < 0) {
11574                 spc = 0;
11575         }
11576         drp->bottle_bw = htonl(spc);
11577         if (asoc->my_rwnd) {
11578                 drp->current_onq = htonl(asoc->size_on_reasm_queue +
11579                     asoc->size_on_all_streams +
11580                     asoc->my_rwnd_control_len +
11581                     stcb->sctp_socket->so_rcv.sb_cc);
11582         } else {
11583                 /*-
11584                  * If my rwnd is 0, possibly from mbuf depletion as well as
11585                  * space used, tell the peer there is NO space aka onq == bw
11586                  */
11587                 drp->current_onq = htonl(spc);
11588         }
11589         drp->reserved = 0;
11590         datap = drp->data;
11591         m_copydata(m, iphlen, len, (caddr_t)datap);
11592         TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
11593         asoc->ctrl_queue_cnt++;
11594 }
11595
11596 void
11597 sctp_send_cwr(struct sctp_tcb *stcb, struct sctp_nets *net, uint32_t high_tsn, uint8_t override)
11598 {
11599         struct sctp_association *asoc;
11600         struct sctp_cwr_chunk *cwr;
11601         struct sctp_tmit_chunk *chk;
11602
11603         SCTP_TCB_LOCK_ASSERT(stcb);
11604         if (net == NULL) {
11605                 return;
11606         }
11607         asoc = &stcb->asoc;
11608         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
11609                 if ((chk->rec.chunk_id.id == SCTP_ECN_CWR) && (net == chk->whoTo)) {
11610                         /*
11611                          * found a previous CWR queued to same destination
11612                          * update it if needed
11613                          */
11614                         uint32_t ctsn;
11615
11616                         cwr = mtod(chk->data, struct sctp_cwr_chunk *);
11617                         ctsn = ntohl(cwr->tsn);
11618                         if (SCTP_TSN_GT(high_tsn, ctsn)) {
11619                                 cwr->tsn = htonl(high_tsn);
11620                         }
11621                         if (override & SCTP_CWR_REDUCE_OVERRIDE) {
11622                                 /* Make sure override is carried */
11623                                 cwr->ch.chunk_flags |= SCTP_CWR_REDUCE_OVERRIDE;
11624                         }
11625                         return;
11626                 }
11627         }
11628         sctp_alloc_a_chunk(stcb, chk);
11629         if (chk == NULL) {
11630                 return;
11631         }
11632         chk->copy_by_ref = 0;
11633         chk->rec.chunk_id.id = SCTP_ECN_CWR;
11634         chk->rec.chunk_id.can_take_data = 1;
11635         chk->flags = 0;
11636         chk->asoc = &stcb->asoc;
11637         chk->send_size = sizeof(struct sctp_cwr_chunk);
11638         chk->data = sctp_get_mbuf_for_msg(chk->send_size, 0, M_NOWAIT, 1, MT_HEADER);
11639         if (chk->data == NULL) {
11640                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
11641                 return;
11642         }
11643         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11644         SCTP_BUF_LEN(chk->data) = chk->send_size;
11645         chk->sent = SCTP_DATAGRAM_UNSENT;
11646         chk->snd_count = 0;
11647         chk->whoTo = net;
11648         atomic_add_int(&chk->whoTo->ref_count, 1);
11649         cwr = mtod(chk->data, struct sctp_cwr_chunk *);
11650         cwr->ch.chunk_type = SCTP_ECN_CWR;
11651         cwr->ch.chunk_flags = override;
11652         cwr->ch.chunk_length = htons(sizeof(struct sctp_cwr_chunk));
11653         cwr->tsn = htonl(high_tsn);
11654         TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
11655         asoc->ctrl_queue_cnt++;
11656 }
11657
11658 static int
11659 sctp_add_stream_reset_out(struct sctp_tcb *stcb, struct sctp_tmit_chunk *chk,
11660     uint32_t seq, uint32_t resp_seq, uint32_t last_sent)
11661 {
11662         uint16_t len, old_len, i;
11663         struct sctp_stream_reset_out_request *req_out;
11664         struct sctp_chunkhdr *ch;
11665         int at;
11666         int number_entries = 0;
11667
11668         ch = mtod(chk->data, struct sctp_chunkhdr *);
11669         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11670         /* get to new offset for the param. */
11671         req_out = (struct sctp_stream_reset_out_request *)((caddr_t)ch + len);
11672         /* now how long will this param be? */
11673         for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
11674                 if ((stcb->asoc.strmout[i].state == SCTP_STREAM_RESET_PENDING) &&
11675                     (stcb->asoc.strmout[i].chunks_on_queues == 0) &&
11676                     TAILQ_EMPTY(&stcb->asoc.strmout[i].outqueue)) {
11677                         number_entries++;
11678                 }
11679         }
11680         if (number_entries == 0) {
11681                 return (0);
11682         }
11683         if (number_entries == stcb->asoc.streamoutcnt) {
11684                 number_entries = 0;
11685         }
11686         if (number_entries > SCTP_MAX_STREAMS_AT_ONCE_RESET) {
11687                 number_entries = SCTP_MAX_STREAMS_AT_ONCE_RESET;
11688         }
11689         len = (uint16_t)(sizeof(struct sctp_stream_reset_out_request) + (sizeof(uint16_t) * number_entries));
11690         req_out->ph.param_type = htons(SCTP_STR_RESET_OUT_REQUEST);
11691         req_out->ph.param_length = htons(len);
11692         req_out->request_seq = htonl(seq);
11693         req_out->response_seq = htonl(resp_seq);
11694         req_out->send_reset_at_tsn = htonl(last_sent);
11695         at = 0;
11696         if (number_entries) {
11697                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
11698                         if ((stcb->asoc.strmout[i].state == SCTP_STREAM_RESET_PENDING) &&
11699                             (stcb->asoc.strmout[i].chunks_on_queues == 0) &&
11700                             TAILQ_EMPTY(&stcb->asoc.strmout[i].outqueue)) {
11701                                 req_out->list_of_streams[at] = htons(i);
11702                                 at++;
11703                                 stcb->asoc.strmout[i].state = SCTP_STREAM_RESET_IN_FLIGHT;
11704                                 if (at >= number_entries) {
11705                                         break;
11706                                 }
11707                         }
11708                 }
11709         } else {
11710                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
11711                         stcb->asoc.strmout[i].state = SCTP_STREAM_RESET_IN_FLIGHT;
11712                 }
11713         }
11714         if (SCTP_SIZE32(len) > len) {
11715                 /*-
11716                  * Need to worry about the pad we may end up adding to the
11717                  * end. This is easy since the struct is either aligned to 4
11718                  * bytes or 2 bytes off.
11719                  */
11720                 req_out->list_of_streams[number_entries] = 0;
11721         }
11722         /* now fix the chunk length */
11723         ch->chunk_length = htons(len + old_len);
11724         chk->book_size = len + old_len;
11725         chk->book_size_scale = 0;
11726         chk->send_size = SCTP_SIZE32(chk->book_size);
11727         SCTP_BUF_LEN(chk->data) = chk->send_size;
11728         return (1);
11729 }
11730
11731 static void
11732 sctp_add_stream_reset_in(struct sctp_tmit_chunk *chk,
11733     int number_entries, uint16_t *list,
11734     uint32_t seq)
11735 {
11736         uint16_t len, old_len, i;
11737         struct sctp_stream_reset_in_request *req_in;
11738         struct sctp_chunkhdr *ch;
11739
11740         ch = mtod(chk->data, struct sctp_chunkhdr *);
11741         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11742
11743         /* get to new offset for the param. */
11744         req_in = (struct sctp_stream_reset_in_request *)((caddr_t)ch + len);
11745         /* now how long will this param be? */
11746         len = (uint16_t)(sizeof(struct sctp_stream_reset_in_request) + (sizeof(uint16_t) * number_entries));
11747         req_in->ph.param_type = htons(SCTP_STR_RESET_IN_REQUEST);
11748         req_in->ph.param_length = htons(len);
11749         req_in->request_seq = htonl(seq);
11750         if (number_entries) {
11751                 for (i = 0; i < number_entries; i++) {
11752                         req_in->list_of_streams[i] = htons(list[i]);
11753                 }
11754         }
11755         if (SCTP_SIZE32(len) > len) {
11756                 /*-
11757                  * Need to worry about the pad we may end up adding to the
11758                  * end. This is easy since the struct is either aligned to 4
11759                  * bytes or 2 bytes off.
11760                  */
11761                 req_in->list_of_streams[number_entries] = 0;
11762         }
11763         /* now fix the chunk length */
11764         ch->chunk_length = htons(len + old_len);
11765         chk->book_size = len + old_len;
11766         chk->book_size_scale = 0;
11767         chk->send_size = SCTP_SIZE32(chk->book_size);
11768         SCTP_BUF_LEN(chk->data) = chk->send_size;
11769         return;
11770 }
11771
11772 static void
11773 sctp_add_stream_reset_tsn(struct sctp_tmit_chunk *chk,
11774     uint32_t seq)
11775 {
11776         uint16_t len, old_len;
11777         struct sctp_stream_reset_tsn_request *req_tsn;
11778         struct sctp_chunkhdr *ch;
11779
11780         ch = mtod(chk->data, struct sctp_chunkhdr *);
11781         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11782
11783         /* get to new offset for the param. */
11784         req_tsn = (struct sctp_stream_reset_tsn_request *)((caddr_t)ch + len);
11785         /* now how long will this param be? */
11786         len = sizeof(struct sctp_stream_reset_tsn_request);
11787         req_tsn->ph.param_type = htons(SCTP_STR_RESET_TSN_REQUEST);
11788         req_tsn->ph.param_length = htons(len);
11789         req_tsn->request_seq = htonl(seq);
11790
11791         /* now fix the chunk length */
11792         ch->chunk_length = htons(len + old_len);
11793         chk->send_size = len + old_len;
11794         chk->book_size = SCTP_SIZE32(chk->send_size);
11795         chk->book_size_scale = 0;
11796         SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size);
11797         return;
11798 }
11799
11800 void
11801 sctp_add_stream_reset_result(struct sctp_tmit_chunk *chk,
11802     uint32_t resp_seq, uint32_t result)
11803 {
11804         uint16_t len, old_len;
11805         struct sctp_stream_reset_response *resp;
11806         struct sctp_chunkhdr *ch;
11807
11808         ch = mtod(chk->data, struct sctp_chunkhdr *);
11809         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11810
11811         /* get to new offset for the param. */
11812         resp = (struct sctp_stream_reset_response *)((caddr_t)ch + len);
11813         /* now how long will this param be? */
11814         len = sizeof(struct sctp_stream_reset_response);
11815         resp->ph.param_type = htons(SCTP_STR_RESET_RESPONSE);
11816         resp->ph.param_length = htons(len);
11817         resp->response_seq = htonl(resp_seq);
11818         resp->result = ntohl(result);
11819
11820         /* now fix the chunk length */
11821         ch->chunk_length = htons(len + old_len);
11822         chk->book_size = len + old_len;
11823         chk->book_size_scale = 0;
11824         chk->send_size = SCTP_SIZE32(chk->book_size);
11825         SCTP_BUF_LEN(chk->data) = chk->send_size;
11826         return;
11827 }
11828
11829 void
11830 sctp_send_deferred_reset_response(struct sctp_tcb *stcb,
11831     struct sctp_stream_reset_list *ent,
11832     int response)
11833 {
11834         struct sctp_association *asoc;
11835         struct sctp_tmit_chunk *chk;
11836         struct sctp_chunkhdr *ch;
11837
11838         asoc = &stcb->asoc;
11839
11840         /*
11841          * Reset our last reset action to the new one IP -> response
11842          * (PERFORMED probably). This assures that if we fail to send, a
11843          * retran from the peer will get the new response.
11844          */
11845         asoc->last_reset_action[0] = response;
11846         if (asoc->stream_reset_outstanding) {
11847                 return;
11848         }
11849         sctp_alloc_a_chunk(stcb, chk);
11850         if (chk == NULL) {
11851                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
11852                 return;
11853         }
11854         chk->copy_by_ref = 0;
11855         chk->rec.chunk_id.id = SCTP_STREAM_RESET;
11856         chk->rec.chunk_id.can_take_data = 0;
11857         chk->flags = 0;
11858         chk->asoc = &stcb->asoc;
11859         chk->book_size = sizeof(struct sctp_chunkhdr);
11860         chk->send_size = SCTP_SIZE32(chk->book_size);
11861         chk->book_size_scale = 0;
11862         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
11863         if (chk->data == NULL) {
11864                 sctp_free_a_chunk(stcb, chk, SCTP_SO_LOCKED);
11865                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
11866                 return;
11867         }
11868         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11869         /* setup chunk parameters */
11870         chk->sent = SCTP_DATAGRAM_UNSENT;
11871         chk->snd_count = 0;
11872         if (stcb->asoc.alternate) {
11873                 chk->whoTo = stcb->asoc.alternate;
11874         } else {
11875                 chk->whoTo = stcb->asoc.primary_destination;
11876         }
11877         ch = mtod(chk->data, struct sctp_chunkhdr *);
11878         ch->chunk_type = SCTP_STREAM_RESET;
11879         ch->chunk_flags = 0;
11880         ch->chunk_length = htons(chk->book_size);
11881         atomic_add_int(&chk->whoTo->ref_count, 1);
11882         SCTP_BUF_LEN(chk->data) = chk->send_size;
11883         sctp_add_stream_reset_result(chk, ent->seq, response);
11884         /* insert the chunk for sending */
11885         TAILQ_INSERT_TAIL(&asoc->control_send_queue,
11886             chk,
11887             sctp_next);
11888         asoc->ctrl_queue_cnt++;
11889 }
11890
11891 void
11892 sctp_add_stream_reset_result_tsn(struct sctp_tmit_chunk *chk,
11893     uint32_t resp_seq, uint32_t result,
11894     uint32_t send_una, uint32_t recv_next)
11895 {
11896         uint16_t len, old_len;
11897         struct sctp_stream_reset_response_tsn *resp;
11898         struct sctp_chunkhdr *ch;
11899
11900         ch = mtod(chk->data, struct sctp_chunkhdr *);
11901         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11902
11903         /* get to new offset for the param. */
11904         resp = (struct sctp_stream_reset_response_tsn *)((caddr_t)ch + len);
11905         /* now how long will this param be? */
11906         len = sizeof(struct sctp_stream_reset_response_tsn);
11907         resp->ph.param_type = htons(SCTP_STR_RESET_RESPONSE);
11908         resp->ph.param_length = htons(len);
11909         resp->response_seq = htonl(resp_seq);
11910         resp->result = htonl(result);
11911         resp->senders_next_tsn = htonl(send_una);
11912         resp->receivers_next_tsn = htonl(recv_next);
11913
11914         /* now fix the chunk length */
11915         ch->chunk_length = htons(len + old_len);
11916         chk->book_size = len + old_len;
11917         chk->send_size = SCTP_SIZE32(chk->book_size);
11918         chk->book_size_scale = 0;
11919         SCTP_BUF_LEN(chk->data) = chk->send_size;
11920         return;
11921 }
11922
11923 static void
11924 sctp_add_an_out_stream(struct sctp_tmit_chunk *chk,
11925     uint32_t seq,
11926     uint16_t adding)
11927 {
11928         uint16_t len, old_len;
11929         struct sctp_chunkhdr *ch;
11930         struct sctp_stream_reset_add_strm *addstr;
11931
11932         ch = mtod(chk->data, struct sctp_chunkhdr *);
11933         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11934
11935         /* get to new offset for the param. */
11936         addstr = (struct sctp_stream_reset_add_strm *)((caddr_t)ch + len);
11937         /* now how long will this param be? */
11938         len = sizeof(struct sctp_stream_reset_add_strm);
11939
11940         /* Fill it out. */
11941         addstr->ph.param_type = htons(SCTP_STR_RESET_ADD_OUT_STREAMS);
11942         addstr->ph.param_length = htons(len);
11943         addstr->request_seq = htonl(seq);
11944         addstr->number_of_streams = htons(adding);
11945         addstr->reserved = 0;
11946
11947         /* now fix the chunk length */
11948         ch->chunk_length = htons(len + old_len);
11949         chk->send_size = len + old_len;
11950         chk->book_size = SCTP_SIZE32(chk->send_size);
11951         chk->book_size_scale = 0;
11952         SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size);
11953         return;
11954 }
11955
11956 static void
11957 sctp_add_an_in_stream(struct sctp_tmit_chunk *chk,
11958     uint32_t seq,
11959     uint16_t adding)
11960 {
11961         uint16_t len, old_len;
11962         struct sctp_chunkhdr *ch;
11963         struct sctp_stream_reset_add_strm *addstr;
11964
11965         ch = mtod(chk->data, struct sctp_chunkhdr *);
11966         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11967
11968         /* get to new offset for the param. */
11969         addstr = (struct sctp_stream_reset_add_strm *)((caddr_t)ch + len);
11970         /* now how long will this param be? */
11971         len = sizeof(struct sctp_stream_reset_add_strm);
11972         /* Fill it out. */
11973         addstr->ph.param_type = htons(SCTP_STR_RESET_ADD_IN_STREAMS);
11974         addstr->ph.param_length = htons(len);
11975         addstr->request_seq = htonl(seq);
11976         addstr->number_of_streams = htons(adding);
11977         addstr->reserved = 0;
11978
11979         /* now fix the chunk length */
11980         ch->chunk_length = htons(len + old_len);
11981         chk->send_size = len + old_len;
11982         chk->book_size = SCTP_SIZE32(chk->send_size);
11983         chk->book_size_scale = 0;
11984         SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size);
11985         return;
11986 }
11987
11988 int
11989 sctp_send_stream_reset_out_if_possible(struct sctp_tcb *stcb, int so_locked)
11990 {
11991         struct sctp_association *asoc;
11992         struct sctp_tmit_chunk *chk;
11993         struct sctp_chunkhdr *ch;
11994         uint32_t seq;
11995
11996         asoc = &stcb->asoc;
11997         asoc->trigger_reset = 0;
11998         if (asoc->stream_reset_outstanding) {
11999                 return (EALREADY);
12000         }
12001         sctp_alloc_a_chunk(stcb, chk);
12002         if (chk == NULL) {
12003                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12004                 return (ENOMEM);
12005         }
12006         chk->copy_by_ref = 0;
12007         chk->rec.chunk_id.id = SCTP_STREAM_RESET;
12008         chk->rec.chunk_id.can_take_data = 0;
12009         chk->flags = 0;
12010         chk->asoc = &stcb->asoc;
12011         chk->book_size = sizeof(struct sctp_chunkhdr);
12012         chk->send_size = SCTP_SIZE32(chk->book_size);
12013         chk->book_size_scale = 0;
12014         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
12015         if (chk->data == NULL) {
12016                 sctp_free_a_chunk(stcb, chk, so_locked);
12017                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12018                 return (ENOMEM);
12019         }
12020         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
12021
12022         /* setup chunk parameters */
12023         chk->sent = SCTP_DATAGRAM_UNSENT;
12024         chk->snd_count = 0;
12025         if (stcb->asoc.alternate) {
12026                 chk->whoTo = stcb->asoc.alternate;
12027         } else {
12028                 chk->whoTo = stcb->asoc.primary_destination;
12029         }
12030         ch = mtod(chk->data, struct sctp_chunkhdr *);
12031         ch->chunk_type = SCTP_STREAM_RESET;
12032         ch->chunk_flags = 0;
12033         ch->chunk_length = htons(chk->book_size);
12034         atomic_add_int(&chk->whoTo->ref_count, 1);
12035         SCTP_BUF_LEN(chk->data) = chk->send_size;
12036         seq = stcb->asoc.str_reset_seq_out;
12037         if (sctp_add_stream_reset_out(stcb, chk, seq, (stcb->asoc.str_reset_seq_in - 1), (stcb->asoc.sending_seq - 1))) {
12038                 seq++;
12039                 asoc->stream_reset_outstanding++;
12040         } else {
12041                 m_freem(chk->data);
12042                 chk->data = NULL;
12043                 sctp_free_a_chunk(stcb, chk, so_locked);
12044                 return (ENOENT);
12045         }
12046         asoc->str_reset = chk;
12047         /* insert the chunk for sending */
12048         TAILQ_INSERT_TAIL(&asoc->control_send_queue,
12049             chk,
12050             sctp_next);
12051         asoc->ctrl_queue_cnt++;
12052
12053         if (stcb->asoc.send_sack) {
12054                 sctp_send_sack(stcb, so_locked);
12055         }
12056         sctp_timer_start(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb, chk->whoTo);
12057         return (0);
12058 }
12059
12060 int
12061 sctp_send_str_reset_req(struct sctp_tcb *stcb,
12062     uint16_t number_entries, uint16_t *list,
12063     uint8_t send_in_req,
12064     uint8_t send_tsn_req,
12065     uint8_t add_stream,
12066     uint16_t adding_o,
12067     uint16_t adding_i, uint8_t peer_asked)
12068 {
12069         struct sctp_association *asoc;
12070         struct sctp_tmit_chunk *chk;
12071         struct sctp_chunkhdr *ch;
12072         int can_send_out_req = 0;
12073         uint32_t seq;
12074
12075         asoc = &stcb->asoc;
12076         if (asoc->stream_reset_outstanding) {
12077                 /*-
12078                  * Already one pending, must get ACK back to clear the flag.
12079                  */
12080                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EBUSY);
12081                 return (EBUSY);
12082         }
12083         if ((send_in_req == 0) && (send_tsn_req == 0) &&
12084             (add_stream == 0)) {
12085                 /* nothing to do */
12086                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12087                 return (EINVAL);
12088         }
12089         if (send_tsn_req && send_in_req) {
12090                 /* error, can't do that */
12091                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12092                 return (EINVAL);
12093         } else if (send_in_req) {
12094                 can_send_out_req = 1;
12095         }
12096         if (number_entries > (MCLBYTES -
12097             SCTP_MIN_OVERHEAD -
12098             sizeof(struct sctp_chunkhdr) -
12099             sizeof(struct sctp_stream_reset_out_request)) /
12100             sizeof(uint16_t)) {
12101                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12102                 return (ENOMEM);
12103         }
12104         sctp_alloc_a_chunk(stcb, chk);
12105         if (chk == NULL) {
12106                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12107                 return (ENOMEM);
12108         }
12109         chk->copy_by_ref = 0;
12110         chk->rec.chunk_id.id = SCTP_STREAM_RESET;
12111         chk->rec.chunk_id.can_take_data = 0;
12112         chk->flags = 0;
12113         chk->asoc = &stcb->asoc;
12114         chk->book_size = sizeof(struct sctp_chunkhdr);
12115         chk->send_size = SCTP_SIZE32(chk->book_size);
12116         chk->book_size_scale = 0;
12117         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
12118         if (chk->data == NULL) {
12119                 sctp_free_a_chunk(stcb, chk, SCTP_SO_LOCKED);
12120                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12121                 return (ENOMEM);
12122         }
12123         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
12124
12125         /* setup chunk parameters */
12126         chk->sent = SCTP_DATAGRAM_UNSENT;
12127         chk->snd_count = 0;
12128         if (stcb->asoc.alternate) {
12129                 chk->whoTo = stcb->asoc.alternate;
12130         } else {
12131                 chk->whoTo = stcb->asoc.primary_destination;
12132         }
12133         atomic_add_int(&chk->whoTo->ref_count, 1);
12134         ch = mtod(chk->data, struct sctp_chunkhdr *);
12135         ch->chunk_type = SCTP_STREAM_RESET;
12136         ch->chunk_flags = 0;
12137         ch->chunk_length = htons(chk->book_size);
12138         SCTP_BUF_LEN(chk->data) = chk->send_size;
12139
12140         seq = stcb->asoc.str_reset_seq_out;
12141         if (can_send_out_req) {
12142                 int ret;
12143
12144                 ret = sctp_add_stream_reset_out(stcb, chk, seq, (stcb->asoc.str_reset_seq_in - 1), (stcb->asoc.sending_seq - 1));
12145                 if (ret) {
12146                         seq++;
12147                         asoc->stream_reset_outstanding++;
12148                 }
12149         }
12150         if ((add_stream & 1) &&
12151             ((stcb->asoc.strm_realoutsize - stcb->asoc.streamoutcnt) < adding_o)) {
12152                 /* Need to allocate more */
12153                 struct sctp_stream_out *oldstream;
12154                 struct sctp_stream_queue_pending *sp, *nsp;
12155                 int i;
12156 #if defined(SCTP_DETAILED_STR_STATS)
12157                 int j;
12158 #endif
12159
12160                 oldstream = stcb->asoc.strmout;
12161                 /* get some more */
12162                 SCTP_MALLOC(stcb->asoc.strmout, struct sctp_stream_out *,
12163                     (stcb->asoc.streamoutcnt + adding_o) * sizeof(struct sctp_stream_out),
12164                     SCTP_M_STRMO);
12165                 if (stcb->asoc.strmout == NULL) {
12166                         uint8_t x;
12167
12168                         stcb->asoc.strmout = oldstream;
12169                         /* Turn off the bit */
12170                         x = add_stream & 0xfe;
12171                         add_stream = x;
12172                         goto skip_stuff;
12173                 }
12174                 /*
12175                  * Ok now we proceed with copying the old out stuff and
12176                  * initializing the new stuff.
12177                  */
12178                 SCTP_TCB_SEND_LOCK(stcb);
12179                 stcb->asoc.ss_functions.sctp_ss_clear(stcb, &stcb->asoc, 0, 1);
12180                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
12181                         TAILQ_INIT(&stcb->asoc.strmout[i].outqueue);
12182                         /* FIX ME FIX ME */
12183                         /*
12184                          * This should be a SS_COPY operation FIX ME STREAM
12185                          * SCHEDULER EXPERT
12186                          */
12187                         stcb->asoc.ss_functions.sctp_ss_init_stream(stcb, &stcb->asoc.strmout[i], &oldstream[i]);
12188                         stcb->asoc.strmout[i].chunks_on_queues = oldstream[i].chunks_on_queues;
12189 #if defined(SCTP_DETAILED_STR_STATS)
12190                         for (j = 0; j < SCTP_PR_SCTP_MAX + 1; j++) {
12191                                 stcb->asoc.strmout[i].abandoned_sent[j] = oldstream[i].abandoned_sent[j];
12192                                 stcb->asoc.strmout[i].abandoned_unsent[j] = oldstream[i].abandoned_unsent[j];
12193                         }
12194 #else
12195                         stcb->asoc.strmout[i].abandoned_sent[0] = oldstream[i].abandoned_sent[0];
12196                         stcb->asoc.strmout[i].abandoned_unsent[0] = oldstream[i].abandoned_unsent[0];
12197 #endif
12198                         stcb->asoc.strmout[i].next_mid_ordered = oldstream[i].next_mid_ordered;
12199                         stcb->asoc.strmout[i].next_mid_unordered = oldstream[i].next_mid_unordered;
12200                         stcb->asoc.strmout[i].last_msg_incomplete = oldstream[i].last_msg_incomplete;
12201                         stcb->asoc.strmout[i].sid = i;
12202                         stcb->asoc.strmout[i].state = oldstream[i].state;
12203                         /* now anything on those queues? */
12204                         TAILQ_FOREACH_SAFE(sp, &oldstream[i].outqueue, next, nsp) {
12205                                 TAILQ_REMOVE(&oldstream[i].outqueue, sp, next);
12206                                 TAILQ_INSERT_TAIL(&stcb->asoc.strmout[i].outqueue, sp, next);
12207                         }
12208                 }
12209                 /* now the new streams */
12210                 stcb->asoc.ss_functions.sctp_ss_init(stcb, &stcb->asoc, 1);
12211                 for (i = stcb->asoc.streamoutcnt; i < (stcb->asoc.streamoutcnt + adding_o); i++) {
12212                         TAILQ_INIT(&stcb->asoc.strmout[i].outqueue);
12213                         stcb->asoc.strmout[i].chunks_on_queues = 0;
12214 #if defined(SCTP_DETAILED_STR_STATS)
12215                         for (j = 0; j < SCTP_PR_SCTP_MAX + 1; j++) {
12216                                 stcb->asoc.strmout[i].abandoned_sent[j] = 0;
12217                                 stcb->asoc.strmout[i].abandoned_unsent[j] = 0;
12218                         }
12219 #else
12220                         stcb->asoc.strmout[i].abandoned_sent[0] = 0;
12221                         stcb->asoc.strmout[i].abandoned_unsent[0] = 0;
12222 #endif
12223                         stcb->asoc.strmout[i].next_mid_ordered = 0;
12224                         stcb->asoc.strmout[i].next_mid_unordered = 0;
12225                         stcb->asoc.strmout[i].sid = i;
12226                         stcb->asoc.strmout[i].last_msg_incomplete = 0;
12227                         stcb->asoc.ss_functions.sctp_ss_init_stream(stcb, &stcb->asoc.strmout[i], NULL);
12228                         stcb->asoc.strmout[i].state = SCTP_STREAM_CLOSED;
12229                 }
12230                 stcb->asoc.strm_realoutsize = stcb->asoc.streamoutcnt + adding_o;
12231                 SCTP_FREE(oldstream, SCTP_M_STRMO);
12232                 SCTP_TCB_SEND_UNLOCK(stcb);
12233         }
12234 skip_stuff:
12235         if ((add_stream & 1) && (adding_o > 0)) {
12236                 asoc->strm_pending_add_size = adding_o;
12237                 asoc->peer_req_out = peer_asked;
12238                 sctp_add_an_out_stream(chk, seq, adding_o);
12239                 seq++;
12240                 asoc->stream_reset_outstanding++;
12241         }
12242         if ((add_stream & 2) && (adding_i > 0)) {
12243                 sctp_add_an_in_stream(chk, seq, adding_i);
12244                 seq++;
12245                 asoc->stream_reset_outstanding++;
12246         }
12247         if (send_in_req) {
12248                 sctp_add_stream_reset_in(chk, number_entries, list, seq);
12249                 seq++;
12250                 asoc->stream_reset_outstanding++;
12251         }
12252         if (send_tsn_req) {
12253                 sctp_add_stream_reset_tsn(chk, seq);
12254                 asoc->stream_reset_outstanding++;
12255         }
12256         asoc->str_reset = chk;
12257         /* insert the chunk for sending */
12258         TAILQ_INSERT_TAIL(&asoc->control_send_queue,
12259             chk,
12260             sctp_next);
12261         asoc->ctrl_queue_cnt++;
12262         if (stcb->asoc.send_sack) {
12263                 sctp_send_sack(stcb, SCTP_SO_LOCKED);
12264         }
12265         sctp_timer_start(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb, chk->whoTo);
12266         return (0);
12267 }
12268
12269 void
12270 sctp_send_abort(struct mbuf *m, int iphlen, struct sockaddr *src, struct sockaddr *dst,
12271     struct sctphdr *sh, uint32_t vtag, struct mbuf *cause,
12272     uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum,
12273     uint32_t vrf_id, uint16_t port)
12274 {
12275         /* Don't respond to an ABORT with an ABORT. */
12276         if (sctp_is_there_an_abort_here(m, iphlen, &vtag)) {
12277                 if (cause)
12278                         sctp_m_freem(cause);
12279                 return;
12280         }
12281         sctp_send_resp_msg(src, dst, sh, vtag, SCTP_ABORT_ASSOCIATION, cause,
12282             mflowtype, mflowid, fibnum,
12283             vrf_id, port);
12284         return;
12285 }
12286
12287 void
12288 sctp_send_operr_to(struct sockaddr *src, struct sockaddr *dst,
12289     struct sctphdr *sh, uint32_t vtag, struct mbuf *cause,
12290     uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum,
12291     uint32_t vrf_id, uint16_t port)
12292 {
12293         sctp_send_resp_msg(src, dst, sh, vtag, SCTP_OPERATION_ERROR, cause,
12294             mflowtype, mflowid, fibnum,
12295             vrf_id, port);
12296         return;
12297 }
12298
12299 static struct mbuf *
12300 sctp_copy_resume(struct uio *uio,
12301     int max_send_len,
12302     int user_marks_eor,
12303     int *error,
12304     uint32_t *sndout,
12305     struct mbuf **new_tail)
12306 {
12307         struct mbuf *m;
12308
12309         m = m_uiotombuf(uio, M_WAITOK, max_send_len, 0,
12310             (M_PKTHDR | (user_marks_eor ? M_EOR : 0)));
12311         if (m == NULL) {
12312                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOBUFS);
12313                 *error = ENOBUFS;
12314         } else {
12315                 *sndout = m_length(m, NULL);
12316                 *new_tail = m_last(m);
12317         }
12318         return (m);
12319 }
12320
12321 static int
12322 sctp_copy_one(struct sctp_stream_queue_pending *sp,
12323     struct uio *uio,
12324     int resv_upfront)
12325 {
12326         sp->data = m_uiotombuf(uio, M_WAITOK, sp->length,
12327             resv_upfront, 0);
12328         if (sp->data == NULL) {
12329                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOBUFS);
12330                 return (ENOBUFS);
12331         }
12332
12333         sp->tail_mbuf = m_last(sp->data);
12334         return (0);
12335 }
12336
12337 static struct sctp_stream_queue_pending *
12338 sctp_copy_it_in(struct sctp_tcb *stcb,
12339     struct sctp_association *asoc,
12340     struct sctp_sndrcvinfo *srcv,
12341     struct uio *uio,
12342     struct sctp_nets *net,
12343     ssize_t max_send_len,
12344     int user_marks_eor,
12345     int *error)
12346 {
12347
12348         /*-
12349          * This routine must be very careful in its work. Protocol
12350          * processing is up and running so care must be taken to spl...()
12351          * when you need to do something that may effect the stcb/asoc. The
12352          * sb is locked however. When data is copied the protocol processing
12353          * should be enabled since this is a slower operation...
12354          */
12355         struct sctp_stream_queue_pending *sp = NULL;
12356         int resv_in_first;
12357
12358         *error = 0;
12359         /* Now can we send this? */
12360         if ((SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_SENT) ||
12361             (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_ACK_SENT) ||
12362             (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_RECEIVED) ||
12363             (asoc->state & SCTP_STATE_SHUTDOWN_PENDING)) {
12364                 /* got data while shutting down */
12365                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
12366                 *error = ECONNRESET;
12367                 goto out_now;
12368         }
12369         sctp_alloc_a_strmoq(stcb, sp);
12370         if (sp == NULL) {
12371                 SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12372                 *error = ENOMEM;
12373                 goto out_now;
12374         }
12375         sp->act_flags = 0;
12376         sp->sender_all_done = 0;
12377         sp->sinfo_flags = srcv->sinfo_flags;
12378         sp->timetolive = srcv->sinfo_timetolive;
12379         sp->ppid = srcv->sinfo_ppid;
12380         sp->context = srcv->sinfo_context;
12381         sp->fsn = 0;
12382         (void)SCTP_GETTIME_TIMEVAL(&sp->ts);
12383
12384         sp->sid = srcv->sinfo_stream;
12385         sp->length = (uint32_t)min(uio->uio_resid, max_send_len);
12386         if ((sp->length == (uint32_t)uio->uio_resid) &&
12387             ((user_marks_eor == 0) ||
12388             (srcv->sinfo_flags & SCTP_EOF) ||
12389             (user_marks_eor && (srcv->sinfo_flags & SCTP_EOR)))) {
12390                 sp->msg_is_complete = 1;
12391         } else {
12392                 sp->msg_is_complete = 0;
12393         }
12394         sp->sender_all_done = 0;
12395         sp->some_taken = 0;
12396         sp->put_last_out = 0;
12397         resv_in_first = SCTP_DATA_CHUNK_OVERHEAD(stcb);
12398         sp->data = sp->tail_mbuf = NULL;
12399         if (sp->length == 0) {
12400                 goto skip_copy;
12401         }
12402         if (srcv->sinfo_keynumber_valid) {
12403                 sp->auth_keyid = srcv->sinfo_keynumber;
12404         } else {
12405                 sp->auth_keyid = stcb->asoc.authinfo.active_keyid;
12406         }
12407         if (sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks)) {
12408                 sctp_auth_key_acquire(stcb, sp->auth_keyid);
12409                 sp->holds_key_ref = 1;
12410         }
12411         *error = sctp_copy_one(sp, uio, resv_in_first);
12412 skip_copy:
12413         if (*error) {
12414                 sctp_free_a_strmoq(stcb, sp, SCTP_SO_LOCKED);
12415                 sp = NULL;
12416         } else {
12417                 if (sp->sinfo_flags & SCTP_ADDR_OVER) {
12418                         sp->net = net;
12419                         atomic_add_int(&sp->net->ref_count, 1);
12420                 } else {
12421                         sp->net = NULL;
12422                 }
12423                 sctp_set_prsctp_policy(sp);
12424         }
12425 out_now:
12426         return (sp);
12427 }
12428
12429 int
12430 sctp_sosend(struct socket *so,
12431     struct sockaddr *addr,
12432     struct uio *uio,
12433     struct mbuf *top,
12434     struct mbuf *control,
12435     int flags,
12436     struct thread *p
12437 )
12438 {
12439         int error, use_sndinfo = 0;
12440         struct sctp_sndrcvinfo sndrcvninfo;
12441         struct sockaddr *addr_to_use;
12442 #if defined(INET) && defined(INET6)
12443         struct sockaddr_in sin;
12444 #endif
12445
12446         if (control) {
12447                 /* process cmsg snd/rcv info (maybe a assoc-id) */
12448                 if (sctp_find_cmsg(SCTP_SNDRCV, (void *)&sndrcvninfo, control,
12449                     sizeof(sndrcvninfo))) {
12450                         /* got one */
12451                         use_sndinfo = 1;
12452                 }
12453         }
12454         addr_to_use = addr;
12455 #if defined(INET) && defined(INET6)
12456         if ((addr != NULL) && (addr->sa_family == AF_INET6)) {
12457                 struct sockaddr_in6 *sin6;
12458
12459                 if (addr->sa_len != sizeof(struct sockaddr_in6)) {
12460                         SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12461                         return (EINVAL);
12462                 }
12463                 sin6 = (struct sockaddr_in6 *)addr;
12464                 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
12465                         in6_sin6_2_sin(&sin, sin6);
12466                         addr_to_use = (struct sockaddr *)&sin;
12467                 }
12468         }
12469 #endif
12470         error = sctp_lower_sosend(so, addr_to_use, uio, top,
12471             control,
12472             flags,
12473             use_sndinfo ? &sndrcvninfo : NULL
12474             ,p
12475             );
12476         return (error);
12477 }
12478
12479 int
12480 sctp_lower_sosend(struct socket *so,
12481     struct sockaddr *addr,
12482     struct uio *uio,
12483     struct mbuf *i_pak,
12484     struct mbuf *control,
12485     int flags,
12486     struct sctp_sndrcvinfo *srcv
12487     ,
12488     struct thread *p
12489 )
12490 {
12491         struct epoch_tracker et;
12492         ssize_t sndlen = 0, max_len, local_add_more;
12493         int error;
12494         struct mbuf *top = NULL;
12495         int queue_only = 0, queue_only_for_init = 0;
12496         int free_cnt_applied = 0;
12497         int un_sent;
12498         int now_filled = 0;
12499         unsigned int inqueue_bytes = 0;
12500         struct sctp_block_entry be;
12501         struct sctp_inpcb *inp;
12502         struct sctp_tcb *stcb = NULL;
12503         struct timeval now;
12504         struct sctp_nets *net;
12505         struct sctp_association *asoc;
12506         struct sctp_inpcb *t_inp;
12507         int user_marks_eor;
12508         int create_lock_applied = 0;
12509         int nagle_applies = 0;
12510         int some_on_control = 0;
12511         int got_all_of_the_send = 0;
12512         int hold_tcblock = 0;
12513         int non_blocking = 0;
12514         ssize_t local_soresv = 0;
12515         uint16_t port;
12516         uint16_t sinfo_flags;
12517         sctp_assoc_t sinfo_assoc_id;
12518
12519         error = 0;
12520         net = NULL;
12521         stcb = NULL;
12522         asoc = NULL;
12523
12524         t_inp = inp = (struct sctp_inpcb *)so->so_pcb;
12525         if (inp == NULL) {
12526                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12527                 error = EINVAL;
12528                 if (i_pak) {
12529                         SCTP_RELEASE_PKT(i_pak);
12530                 }
12531                 return (error);
12532         }
12533         if ((uio == NULL) && (i_pak == NULL)) {
12534                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12535                 return (EINVAL);
12536         }
12537         user_marks_eor = sctp_is_feature_on(inp, SCTP_PCB_FLAGS_EXPLICIT_EOR);
12538         atomic_add_int(&inp->total_sends, 1);
12539         if (uio) {
12540                 if (uio->uio_resid < 0) {
12541                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12542                         return (EINVAL);
12543                 }
12544                 sndlen = uio->uio_resid;
12545         } else {
12546                 top = SCTP_HEADER_TO_CHAIN(i_pak);
12547                 sndlen = SCTP_HEADER_LEN(i_pak);
12548         }
12549         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Send called addr:%p send length %zd\n",
12550             (void *)addr,
12551             sndlen);
12552         if ((inp->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) &&
12553             SCTP_IS_LISTENING(inp)) {
12554                 /* The listener can NOT send */
12555                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOTCONN);
12556                 error = ENOTCONN;
12557                 goto out_unlocked;
12558         }
12559         /**
12560          * Pre-screen address, if one is given the sin-len
12561          * must be set correctly!
12562          */
12563         if (addr) {
12564                 union sctp_sockstore *raddr = (union sctp_sockstore *)addr;
12565
12566                 switch (raddr->sa.sa_family) {
12567 #ifdef INET
12568                 case AF_INET:
12569                         if (raddr->sin.sin_len != sizeof(struct sockaddr_in)) {
12570                                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12571                                 error = EINVAL;
12572                                 goto out_unlocked;
12573                         }
12574                         port = raddr->sin.sin_port;
12575                         break;
12576 #endif
12577 #ifdef INET6
12578                 case AF_INET6:
12579                         if (raddr->sin6.sin6_len != sizeof(struct sockaddr_in6)) {
12580                                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12581                                 error = EINVAL;
12582                                 goto out_unlocked;
12583                         }
12584                         port = raddr->sin6.sin6_port;
12585                         break;
12586 #endif
12587                 default:
12588                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EAFNOSUPPORT);
12589                         error = EAFNOSUPPORT;
12590                         goto out_unlocked;
12591                 }
12592         } else
12593                 port = 0;
12594
12595         if (srcv) {
12596                 sinfo_flags = srcv->sinfo_flags;
12597                 sinfo_assoc_id = srcv->sinfo_assoc_id;
12598                 if (INVALID_SINFO_FLAG(sinfo_flags) ||
12599                     PR_SCTP_INVALID_POLICY(sinfo_flags)) {
12600                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12601                         error = EINVAL;
12602                         goto out_unlocked;
12603                 }
12604                 if (srcv->sinfo_flags)
12605                         SCTP_STAT_INCR(sctps_sends_with_flags);
12606         } else {
12607                 sinfo_flags = inp->def_send.sinfo_flags;
12608                 sinfo_assoc_id = inp->def_send.sinfo_assoc_id;
12609         }
12610         if (flags & MSG_EOR) {
12611                 sinfo_flags |= SCTP_EOR;
12612         }
12613         if (flags & MSG_EOF) {
12614                 sinfo_flags |= SCTP_EOF;
12615         }
12616         if (sinfo_flags & SCTP_SENDALL) {
12617                 /* its a sendall */
12618                 error = sctp_sendall(inp, uio, top, srcv);
12619                 top = NULL;
12620                 goto out_unlocked;
12621         }
12622         if ((sinfo_flags & SCTP_ADDR_OVER) && (addr == NULL)) {
12623                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12624                 error = EINVAL;
12625                 goto out_unlocked;
12626         }
12627         /* now we must find the assoc */
12628         if ((inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) ||
12629             (inp->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) {
12630                 SCTP_INP_RLOCK(inp);
12631                 stcb = LIST_FIRST(&inp->sctp_asoc_list);
12632                 if (stcb) {
12633                         SCTP_TCB_LOCK(stcb);
12634                         hold_tcblock = 1;
12635                 }
12636                 SCTP_INP_RUNLOCK(inp);
12637         } else if (sinfo_assoc_id) {
12638                 stcb = sctp_findassociation_ep_asocid(inp, sinfo_assoc_id, 1);
12639                 if (stcb != NULL) {
12640                         hold_tcblock = 1;
12641                 }
12642         } else if (addr) {
12643                 /*-
12644                  * Since we did not use findep we must
12645                  * increment it, and if we don't find a tcb
12646                  * decrement it.
12647                  */
12648                 SCTP_INP_WLOCK(inp);
12649                 SCTP_INP_INCR_REF(inp);
12650                 SCTP_INP_WUNLOCK(inp);
12651                 stcb = sctp_findassociation_ep_addr(&t_inp, addr, &net, NULL, NULL);
12652                 if (stcb == NULL) {
12653                         SCTP_INP_WLOCK(inp);
12654                         SCTP_INP_DECR_REF(inp);
12655                         SCTP_INP_WUNLOCK(inp);
12656                 } else {
12657                         hold_tcblock = 1;
12658                 }
12659         }
12660         if ((stcb == NULL) && (addr)) {
12661                 /* Possible implicit send? */
12662                 SCTP_ASOC_CREATE_LOCK(inp);
12663                 create_lock_applied = 1;
12664                 if ((inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) ||
12665                     (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE)) {
12666                         /* Should I really unlock ? */
12667                         SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12668                         error = EINVAL;
12669                         goto out_unlocked;
12670                 }
12671                 if (((inp->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) == 0) &&
12672                     (addr->sa_family == AF_INET6)) {
12673                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12674                         error = EINVAL;
12675                         goto out_unlocked;
12676                 }
12677                 SCTP_INP_WLOCK(inp);
12678                 SCTP_INP_INCR_REF(inp);
12679                 SCTP_INP_WUNLOCK(inp);
12680                 /* With the lock applied look again */
12681                 stcb = sctp_findassociation_ep_addr(&t_inp, addr, &net, NULL, NULL);
12682 #if defined(INET) || defined(INET6)
12683                 if ((stcb == NULL) && (control != NULL) && (port > 0)) {
12684                         stcb = sctp_findassociation_cmsgs(&t_inp, port, control, &net, &error);
12685                 }
12686 #endif
12687                 if (stcb == NULL) {
12688                         SCTP_INP_WLOCK(inp);
12689                         SCTP_INP_DECR_REF(inp);
12690                         SCTP_INP_WUNLOCK(inp);
12691                 } else {
12692                         hold_tcblock = 1;
12693                 }
12694                 if (error) {
12695                         goto out_unlocked;
12696                 }
12697                 if (t_inp != inp) {
12698                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOTCONN);
12699                         error = ENOTCONN;
12700                         goto out_unlocked;
12701                 }
12702         }
12703         if (stcb == NULL) {
12704                 if (addr == NULL) {
12705                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOENT);
12706                         error = ENOENT;
12707                         goto out_unlocked;
12708                 } else {
12709                         /* We must go ahead and start the INIT process */
12710                         uint32_t vrf_id;
12711
12712                         if ((sinfo_flags & SCTP_ABORT) ||
12713                             ((sinfo_flags & SCTP_EOF) && (sndlen == 0))) {
12714                                 /*-
12715                                  * User asks to abort a non-existent assoc,
12716                                  * or EOF a non-existent assoc with no data
12717                                  */
12718                                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOENT);
12719                                 error = ENOENT;
12720                                 goto out_unlocked;
12721                         }
12722                         /* get an asoc/stcb struct */
12723                         vrf_id = inp->def_vrf_id;
12724 #ifdef INVARIANTS
12725                         if (create_lock_applied == 0) {
12726                                 panic("Error, should hold create lock and I don't?");
12727                         }
12728 #endif
12729                         stcb = sctp_aloc_assoc_connected(inp, addr, &error, 0, 0, vrf_id,
12730                             inp->sctp_ep.pre_open_stream_count,
12731                             inp->sctp_ep.port,
12732                             p,
12733                             SCTP_INITIALIZE_AUTH_PARAMS);
12734                         if (stcb == NULL) {
12735                                 /* Error is setup for us in the call */
12736                                 goto out_unlocked;
12737                         }
12738                         hold_tcblock = 1;
12739                         if (create_lock_applied) {
12740                                 SCTP_ASOC_CREATE_UNLOCK(inp);
12741                                 create_lock_applied = 0;
12742                         } else {
12743                                 SCTP_PRINTF("Huh-3? create lock should have been on??\n");
12744                         }
12745                         /*
12746                          * Turn on queue only flag to prevent data from
12747                          * being sent
12748                          */
12749                         queue_only = 1;
12750                         asoc = &stcb->asoc;
12751                         SCTP_SET_STATE(stcb, SCTP_STATE_COOKIE_WAIT);
12752                         (void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered);
12753
12754                         if (control) {
12755                                 if (sctp_process_cmsgs_for_init(stcb, control, &error)) {
12756                                         sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
12757                                             SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_6);
12758                                         hold_tcblock = 0;
12759                                         stcb = NULL;
12760                                         goto out_unlocked;
12761                                 }
12762                         }
12763                         /* out with the INIT */
12764                         queue_only_for_init = 1;
12765                         /*-
12766                          * we may want to dig in after this call and adjust the MTU
12767                          * value. It defaulted to 1500 (constant) but the ro
12768                          * structure may now have an update and thus we may need to
12769                          * change it BEFORE we append the message.
12770                          */
12771                 }
12772         } else
12773                 asoc = &stcb->asoc;
12774         if (srcv == NULL) {
12775                 srcv = (struct sctp_sndrcvinfo *)&asoc->def_send;
12776                 sinfo_flags = srcv->sinfo_flags;
12777                 if (flags & MSG_EOR) {
12778                         sinfo_flags |= SCTP_EOR;
12779                 }
12780                 if (flags & MSG_EOF) {
12781                         sinfo_flags |= SCTP_EOF;
12782                 }
12783         }
12784         if (sinfo_flags & SCTP_ADDR_OVER) {
12785                 if (addr)
12786                         net = sctp_findnet(stcb, addr);
12787                 else
12788                         net = NULL;
12789                 if ((net == NULL) ||
12790                     ((port != 0) && (port != stcb->rport))) {
12791                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12792                         error = EINVAL;
12793                         goto out_unlocked;
12794                 }
12795         } else {
12796                 if (stcb->asoc.alternate) {
12797                         net = stcb->asoc.alternate;
12798                 } else {
12799                         net = stcb->asoc.primary_destination;
12800                 }
12801         }
12802         atomic_add_int(&stcb->total_sends, 1);
12803         /* Keep the stcb from being freed under our feet */
12804         atomic_add_int(&asoc->refcnt, 1);
12805         free_cnt_applied = 1;
12806
12807         if (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_NO_FRAGMENT)) {
12808                 if (sndlen > (ssize_t)asoc->smallest_mtu) {
12809                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EMSGSIZE);
12810                         error = EMSGSIZE;
12811                         goto out_unlocked;
12812                 }
12813         }
12814         if (SCTP_SO_IS_NBIO(so)
12815             || (flags & (MSG_NBIO | MSG_DONTWAIT)) != 0
12816             ) {
12817                 non_blocking = 1;
12818         }
12819         /* would we block? */
12820         if (non_blocking) {
12821                 ssize_t amount;
12822
12823                 if (hold_tcblock == 0) {
12824                         SCTP_TCB_LOCK(stcb);
12825                         hold_tcblock = 1;
12826                 }
12827                 inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * SCTP_DATA_CHUNK_OVERHEAD(stcb));
12828                 if (user_marks_eor == 0) {
12829                         amount = sndlen;
12830                 } else {
12831                         amount = 1;
12832                 }
12833                 if ((SCTP_SB_LIMIT_SND(so) < (amount + inqueue_bytes + stcb->asoc.sb_send_resv)) ||
12834                     (stcb->asoc.chunks_on_out_queue >= SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue))) {
12835                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EWOULDBLOCK);
12836                         if (sndlen > (ssize_t)SCTP_SB_LIMIT_SND(so))
12837                                 error = EMSGSIZE;
12838                         else
12839                                 error = EWOULDBLOCK;
12840                         goto out_unlocked;
12841                 }
12842                 stcb->asoc.sb_send_resv += (uint32_t)sndlen;
12843                 SCTP_TCB_UNLOCK(stcb);
12844                 hold_tcblock = 0;
12845         } else {
12846                 atomic_add_int(&stcb->asoc.sb_send_resv, (int)sndlen);
12847         }
12848         local_soresv = sndlen;
12849         if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
12850                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
12851                 error = ECONNRESET;
12852                 goto out_unlocked;
12853         }
12854         if (create_lock_applied) {
12855                 SCTP_ASOC_CREATE_UNLOCK(inp);
12856                 create_lock_applied = 0;
12857         }
12858         /* Is the stream no. valid? */
12859         if (srcv->sinfo_stream >= asoc->streamoutcnt) {
12860                 /* Invalid stream number */
12861                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12862                 error = EINVAL;
12863                 goto out_unlocked;
12864         }
12865         if ((asoc->strmout[srcv->sinfo_stream].state != SCTP_STREAM_OPEN) &&
12866             (asoc->strmout[srcv->sinfo_stream].state != SCTP_STREAM_OPENING)) {
12867                 /*
12868                  * Can't queue any data while stream reset is underway.
12869                  */
12870                 if (asoc->strmout[srcv->sinfo_stream].state > SCTP_STREAM_OPEN) {
12871                         error = EAGAIN;
12872                 } else {
12873                         error = EINVAL;
12874                 }
12875                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, error);
12876                 goto out_unlocked;
12877         }
12878         if ((SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_WAIT) ||
12879             (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)) {
12880                 queue_only = 1;
12881         }
12882         /* we are now done with all control */
12883         if (control) {
12884                 sctp_m_freem(control);
12885                 control = NULL;
12886         }
12887         if ((SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_SENT) ||
12888             (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_RECEIVED) ||
12889             (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_ACK_SENT) ||
12890             (asoc->state & SCTP_STATE_SHUTDOWN_PENDING)) {
12891                 if (sinfo_flags & SCTP_ABORT) {
12892                         ;
12893                 } else {
12894                         SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
12895                         error = ECONNRESET;
12896                         goto out_unlocked;
12897                 }
12898         }
12899         /* Ok, we will attempt a msgsnd :> */
12900         if (p) {
12901                 p->td_ru.ru_msgsnd++;
12902         }
12903         /* Are we aborting? */
12904         if (sinfo_flags & SCTP_ABORT) {
12905                 struct mbuf *mm;
12906                 ssize_t tot_demand, tot_out = 0, max_out;
12907
12908                 SCTP_STAT_INCR(sctps_sends_with_abort);
12909                 if ((SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_WAIT) ||
12910                     (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)) {
12911                         /* It has to be up before we abort */
12912                         /* how big is the user initiated abort? */
12913                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12914                         error = EINVAL;
12915                         goto out;
12916                 }
12917                 if (hold_tcblock) {
12918                         SCTP_TCB_UNLOCK(stcb);
12919                         hold_tcblock = 0;
12920                 }
12921                 if (top) {
12922                         struct mbuf *cntm = NULL;
12923
12924                         mm = sctp_get_mbuf_for_msg(sizeof(struct sctp_paramhdr), 0, M_WAITOK, 1, MT_DATA);
12925                         if (sndlen != 0) {
12926                                 for (cntm = top; cntm; cntm = SCTP_BUF_NEXT(cntm)) {
12927                                         tot_out += SCTP_BUF_LEN(cntm);
12928                                 }
12929                         }
12930                 } else {
12931                         /* Must fit in a MTU */
12932                         tot_out = sndlen;
12933                         tot_demand = (tot_out + sizeof(struct sctp_paramhdr));
12934                         if (tot_demand > SCTP_DEFAULT_ADD_MORE) {
12935                                 /* To big */
12936                                 SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EMSGSIZE);
12937                                 error = EMSGSIZE;
12938                                 goto out;
12939                         }
12940                         mm = sctp_get_mbuf_for_msg((unsigned int)tot_demand, 0, M_WAITOK, 1, MT_DATA);
12941                 }
12942                 if (mm == NULL) {
12943                         SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12944                         error = ENOMEM;
12945                         goto out;
12946                 }
12947                 max_out = asoc->smallest_mtu - sizeof(struct sctp_paramhdr);
12948                 max_out -= sizeof(struct sctp_abort_msg);
12949                 if (tot_out > max_out) {
12950                         tot_out = max_out;
12951                 }
12952                 if (mm) {
12953                         struct sctp_paramhdr *ph;
12954
12955                         /* now move forward the data pointer */
12956                         ph = mtod(mm, struct sctp_paramhdr *);
12957                         ph->param_type = htons(SCTP_CAUSE_USER_INITIATED_ABT);
12958                         ph->param_length = htons((uint16_t)(sizeof(struct sctp_paramhdr) + tot_out));
12959                         ph++;
12960                         SCTP_BUF_LEN(mm) = (int)(tot_out + sizeof(struct sctp_paramhdr));
12961                         if (top == NULL) {
12962                                 error = uiomove((caddr_t)ph, (int)tot_out, uio);
12963                                 if (error) {
12964                                         /*-
12965                                          * Here if we can't get his data we
12966                                          * still abort we just don't get to
12967                                          * send the users note :-0
12968                                          */
12969                                         sctp_m_freem(mm);
12970                                         mm = NULL;
12971                                 }
12972                         } else {
12973                                 if (sndlen != 0) {
12974                                         SCTP_BUF_NEXT(mm) = top;
12975                                 }
12976                         }
12977                 }
12978                 if (hold_tcblock == 0) {
12979                         SCTP_TCB_LOCK(stcb);
12980                 }
12981                 atomic_add_int(&stcb->asoc.refcnt, -1);
12982                 free_cnt_applied = 0;
12983                 /* release this lock, otherwise we hang on ourselves */
12984                 NET_EPOCH_ENTER(et);
12985                 sctp_abort_an_association(stcb->sctp_ep, stcb, mm, false, SCTP_SO_LOCKED);
12986                 NET_EPOCH_EXIT(et);
12987                 /* now relock the stcb so everything is sane */
12988                 hold_tcblock = 0;
12989                 stcb = NULL;
12990                 /*
12991                  * In this case top is already chained to mm avoid double
12992                  * free, since we free it below if top != NULL and driver
12993                  * would free it after sending the packet out
12994                  */
12995                 if (sndlen != 0) {
12996                         top = NULL;
12997                 }
12998                 goto out_unlocked;
12999         }
13000         /* Calculate the maximum we can send */
13001         inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * SCTP_DATA_CHUNK_OVERHEAD(stcb));
13002         if (SCTP_SB_LIMIT_SND(so) > inqueue_bytes) {
13003                 max_len = SCTP_SB_LIMIT_SND(so) - inqueue_bytes;
13004         } else {
13005                 max_len = 0;
13006         }
13007         if (hold_tcblock) {
13008                 SCTP_TCB_UNLOCK(stcb);
13009                 hold_tcblock = 0;
13010         }
13011         if (asoc->strmout == NULL) {
13012                 /* huh? software error */
13013                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EFAULT);
13014                 error = EFAULT;
13015                 goto out_unlocked;
13016         }
13017
13018         /* Unless E_EOR mode is on, we must make a send FIT in one call. */
13019         if ((user_marks_eor == 0) &&
13020             (sndlen > (ssize_t)SCTP_SB_LIMIT_SND(stcb->sctp_socket))) {
13021                 /* It will NEVER fit */
13022                 SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EMSGSIZE);
13023                 error = EMSGSIZE;
13024                 goto out_unlocked;
13025         }
13026         if ((uio == NULL) && user_marks_eor) {
13027                 /*-
13028                  * We do not support eeor mode for
13029                  * sending with mbuf chains (like sendfile).
13030                  */
13031                 SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
13032                 error = EINVAL;
13033                 goto out_unlocked;
13034         }
13035
13036         if (user_marks_eor) {
13037                 local_add_more = (ssize_t)min(SCTP_SB_LIMIT_SND(so), SCTP_BASE_SYSCTL(sctp_add_more_threshold));
13038         } else {
13039                 /*-
13040                  * For non-eeor the whole message must fit in
13041                  * the socket send buffer.
13042                  */
13043                 local_add_more = sndlen;
13044         }
13045         if (non_blocking) {
13046                 goto skip_preblock;
13047         }
13048         if (((max_len <= local_add_more) &&
13049             ((ssize_t)SCTP_SB_LIMIT_SND(so) >= local_add_more)) ||
13050             (max_len == 0) ||
13051             ((stcb->asoc.chunks_on_out_queue + stcb->asoc.stream_queue_cnt) >= SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue))) {
13052                 /* No room right now ! */
13053                 SOCKBUF_LOCK(&so->so_snd);
13054                 inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * SCTP_DATA_CHUNK_OVERHEAD(stcb));
13055                 while ((SCTP_SB_LIMIT_SND(so) < (inqueue_bytes + local_add_more)) ||
13056                     ((stcb->asoc.stream_queue_cnt + stcb->asoc.chunks_on_out_queue) >= SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue))) {
13057                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "pre_block limit:%u <(inq:%d + %zd) || (%d+%d > %d)\n",
13058                             (unsigned int)SCTP_SB_LIMIT_SND(so),
13059                             inqueue_bytes,
13060                             local_add_more,
13061                             stcb->asoc.stream_queue_cnt,
13062                             stcb->asoc.chunks_on_out_queue,
13063                             SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue));
13064                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13065                                 sctp_log_block(SCTP_BLOCK_LOG_INTO_BLKA, asoc, sndlen);
13066                         }
13067                         be.error = 0;
13068                         stcb->block_entry = &be;
13069                         error = sbwait(&so->so_snd);
13070                         stcb->block_entry = NULL;
13071                         if (error || so->so_error || be.error) {
13072                                 if (error == 0) {
13073                                         if (so->so_error)
13074                                                 error = so->so_error;
13075                                         if (be.error) {
13076                                                 error = be.error;
13077                                         }
13078                                 }
13079                                 SOCKBUF_UNLOCK(&so->so_snd);
13080                                 goto out_unlocked;
13081                         }
13082                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13083                                 sctp_log_block(SCTP_BLOCK_LOG_OUTOF_BLK,
13084                                     asoc, stcb->asoc.total_output_queue_size);
13085                         }
13086                         if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
13087                                 SOCKBUF_UNLOCK(&so->so_snd);
13088                                 goto out_unlocked;
13089                         }
13090                         inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * SCTP_DATA_CHUNK_OVERHEAD(stcb));
13091                 }
13092                 if (SCTP_SB_LIMIT_SND(so) > inqueue_bytes) {
13093                         max_len = SCTP_SB_LIMIT_SND(so) - inqueue_bytes;
13094                 } else {
13095                         max_len = 0;
13096                 }
13097                 SOCKBUF_UNLOCK(&so->so_snd);
13098         }
13099
13100 skip_preblock:
13101         if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
13102                 goto out_unlocked;
13103         }
13104         /*
13105          * sndlen covers for mbuf case uio_resid covers for the non-mbuf
13106          * case NOTE: uio will be null when top/mbuf is passed
13107          */
13108         if (sndlen == 0) {
13109                 if (sinfo_flags & SCTP_EOF) {
13110                         got_all_of_the_send = 1;
13111                         goto dataless_eof;
13112                 } else {
13113                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
13114                         error = EINVAL;
13115                         goto out;
13116                 }
13117         }
13118         if (top == NULL) {
13119                 struct sctp_stream_queue_pending *sp;
13120                 struct sctp_stream_out *strm;
13121                 uint32_t sndout;
13122
13123                 SCTP_TCB_SEND_LOCK(stcb);
13124                 if ((asoc->stream_locked) &&
13125                     (asoc->stream_locked_on != srcv->sinfo_stream)) {
13126                         SCTP_TCB_SEND_UNLOCK(stcb);
13127                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
13128                         error = EINVAL;
13129                         goto out;
13130                 }
13131                 strm = &stcb->asoc.strmout[srcv->sinfo_stream];
13132                 if (strm->last_msg_incomplete == 0) {
13133         do_a_copy_in:
13134                         SCTP_TCB_SEND_UNLOCK(stcb);
13135                         sp = sctp_copy_it_in(stcb, asoc, srcv, uio, net, max_len, user_marks_eor, &error);
13136                         if (error) {
13137                                 goto out;
13138                         }
13139                         SCTP_TCB_SEND_LOCK(stcb);
13140                         /* The out streams might be reallocated. */
13141                         strm = &stcb->asoc.strmout[srcv->sinfo_stream];
13142                         if (sp->msg_is_complete) {
13143                                 strm->last_msg_incomplete = 0;
13144                                 asoc->stream_locked = 0;
13145                         } else {
13146                                 /*
13147                                  * Just got locked to this guy in case of an
13148                                  * interrupt.
13149                                  */
13150                                 strm->last_msg_incomplete = 1;
13151                                 if (stcb->asoc.idata_supported == 0) {
13152                                         asoc->stream_locked = 1;
13153                                         asoc->stream_locked_on = srcv->sinfo_stream;
13154                                 }
13155                                 sp->sender_all_done = 0;
13156                         }
13157                         sctp_snd_sb_alloc(stcb, sp->length);
13158                         atomic_add_int(&asoc->stream_queue_cnt, 1);
13159                         if (sinfo_flags & SCTP_UNORDERED) {
13160                                 SCTP_STAT_INCR(sctps_sends_with_unord);
13161                         }
13162                         sp->processing = 1;
13163                         TAILQ_INSERT_TAIL(&strm->outqueue, sp, next);
13164                         stcb->asoc.ss_functions.sctp_ss_add_to_stream(stcb, asoc, strm, sp, 1);
13165                 } else {
13166                         sp = TAILQ_LAST(&strm->outqueue, sctp_streamhead);
13167                         if (sp == NULL) {
13168                                 /* ???? Huh ??? last msg is gone */
13169 #ifdef INVARIANTS
13170                                 panic("Warning: Last msg marked incomplete, yet nothing left?");
13171 #else
13172                                 SCTP_PRINTF("Warning: Last msg marked incomplete, yet nothing left?\n");
13173                                 strm->last_msg_incomplete = 0;
13174 #endif
13175                                 goto do_a_copy_in;
13176                         }
13177                         if (sp->processing) {
13178                                 SCTP_TCB_SEND_UNLOCK(stcb);
13179                                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
13180                                 error = EINVAL;
13181                                 goto out;
13182                         } else {
13183                                 sp->processing = 1;
13184                         }
13185                 }
13186                 SCTP_TCB_SEND_UNLOCK(stcb);
13187                 while (uio->uio_resid > 0) {
13188                         /* How much room do we have? */
13189                         struct mbuf *new_tail, *mm;
13190
13191                         inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * SCTP_DATA_CHUNK_OVERHEAD(stcb));
13192                         if (SCTP_SB_LIMIT_SND(so) > inqueue_bytes)
13193                                 max_len = SCTP_SB_LIMIT_SND(so) - inqueue_bytes;
13194                         else
13195                                 max_len = 0;
13196
13197                         if ((max_len > (ssize_t)SCTP_BASE_SYSCTL(sctp_add_more_threshold)) ||
13198                             (max_len && (SCTP_SB_LIMIT_SND(so) < SCTP_BASE_SYSCTL(sctp_add_more_threshold))) ||
13199                             (uio->uio_resid && (uio->uio_resid <= max_len))) {
13200                                 sndout = 0;
13201                                 new_tail = NULL;
13202                                 if (hold_tcblock) {
13203                                         SCTP_TCB_UNLOCK(stcb);
13204                                         hold_tcblock = 0;
13205                                 }
13206                                 mm = sctp_copy_resume(uio, (int)max_len, user_marks_eor, &error, &sndout, &new_tail);
13207                                 if ((mm == NULL) || error) {
13208                                         if (mm) {
13209                                                 sctp_m_freem(mm);
13210                                         }
13211                                         SCTP_TCB_SEND_LOCK(stcb);
13212                                         if (((stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) == 0) &&
13213                                             ((stcb->asoc.state & SCTP_STATE_WAS_ABORTED) == 0) &&
13214                                             (sp != NULL)) {
13215                                                 sp->processing = 0;
13216                                         }
13217                                         SCTP_TCB_SEND_UNLOCK(stcb);
13218                                         goto out;
13219                                 }
13220                                 /* Update the mbuf and count */
13221                                 SCTP_TCB_SEND_LOCK(stcb);
13222                                 if ((stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) ||
13223                                     (stcb->asoc.state & SCTP_STATE_WAS_ABORTED)) {
13224                                         /*
13225                                          * we need to get out. Peer probably
13226                                          * aborted.
13227                                          */
13228                                         sctp_m_freem(mm);
13229                                         if (stcb->asoc.state & SCTP_STATE_WAS_ABORTED) {
13230                                                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
13231                                                 error = ECONNRESET;
13232                                         }
13233                                         SCTP_TCB_SEND_UNLOCK(stcb);
13234                                         goto out;
13235                                 }
13236                                 if (sp->tail_mbuf) {
13237                                         /* tack it to the end */
13238                                         SCTP_BUF_NEXT(sp->tail_mbuf) = mm;
13239                                         sp->tail_mbuf = new_tail;
13240                                 } else {
13241                                         /* A stolen mbuf */
13242                                         sp->data = mm;
13243                                         sp->tail_mbuf = new_tail;
13244                                 }
13245                                 sctp_snd_sb_alloc(stcb, sndout);
13246                                 atomic_add_int(&sp->length, sndout);
13247                                 if (sinfo_flags & SCTP_SACK_IMMEDIATELY) {
13248                                         sp->sinfo_flags |= SCTP_SACK_IMMEDIATELY;
13249                                 }
13250
13251                                 /* Did we reach EOR? */
13252                                 if ((uio->uio_resid == 0) &&
13253                                     ((user_marks_eor == 0) ||
13254                                     (sinfo_flags & SCTP_EOF) ||
13255                                     (user_marks_eor && (sinfo_flags & SCTP_EOR)))) {
13256                                         sp->msg_is_complete = 1;
13257                                 } else {
13258                                         sp->msg_is_complete = 0;
13259                                 }
13260                                 SCTP_TCB_SEND_UNLOCK(stcb);
13261                         }
13262                         if (uio->uio_resid == 0) {
13263                                 /* got it all? */
13264                                 continue;
13265                         }
13266                         /* PR-SCTP? */
13267                         if ((asoc->prsctp_supported) && (asoc->sent_queue_cnt_removeable > 0)) {
13268                                 /*
13269                                  * This is ugly but we must assure locking
13270                                  * order
13271                                  */
13272                                 if (hold_tcblock == 0) {
13273                                         SCTP_TCB_LOCK(stcb);
13274                                         hold_tcblock = 1;
13275                                 }
13276                                 sctp_prune_prsctp(stcb, asoc, srcv, (int)sndlen);
13277                                 inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * SCTP_DATA_CHUNK_OVERHEAD(stcb));
13278                                 if (SCTP_SB_LIMIT_SND(so) > inqueue_bytes)
13279                                         max_len = SCTP_SB_LIMIT_SND(so) - inqueue_bytes;
13280                                 else
13281                                         max_len = 0;
13282                                 if (max_len > 0) {
13283                                         continue;
13284                                 }
13285                                 SCTP_TCB_UNLOCK(stcb);
13286                                 hold_tcblock = 0;
13287                         }
13288                         /* wait for space now */
13289                         if (non_blocking) {
13290                                 /* Non-blocking io in place out */
13291                                 SCTP_TCB_SEND_LOCK(stcb);
13292                                 if (sp != NULL) {
13293                                         sp->processing = 0;
13294                                 }
13295                                 SCTP_TCB_SEND_UNLOCK(stcb);
13296                                 goto skip_out_eof;
13297                         }
13298                         /* What about the INIT, send it maybe */
13299                         if (queue_only_for_init) {
13300                                 if (hold_tcblock == 0) {
13301                                         SCTP_TCB_LOCK(stcb);
13302                                         hold_tcblock = 1;
13303                                 }
13304                                 if (SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) {
13305                                         /* a collision took us forward? */
13306                                         queue_only = 0;
13307                                 } else {
13308                                         NET_EPOCH_ENTER(et);
13309                                         sctp_send_initiate(inp, stcb, SCTP_SO_LOCKED);
13310                                         NET_EPOCH_EXIT(et);
13311                                         SCTP_SET_STATE(stcb, SCTP_STATE_COOKIE_WAIT);
13312                                         queue_only = 1;
13313                                 }
13314                         }
13315                         if ((net->flight_size > net->cwnd) &&
13316                             (asoc->sctp_cmt_on_off == 0)) {
13317                                 SCTP_STAT_INCR(sctps_send_cwnd_avoid);
13318                                 queue_only = 1;
13319                         } else if (asoc->ifp_had_enobuf) {
13320                                 SCTP_STAT_INCR(sctps_ifnomemqueued);
13321                                 if (net->flight_size > (2 * net->mtu)) {
13322                                         queue_only = 1;
13323                                 }
13324                                 asoc->ifp_had_enobuf = 0;
13325                         }
13326                         un_sent = stcb->asoc.total_output_queue_size - stcb->asoc.total_flight;
13327                         if ((sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY)) &&
13328                             (stcb->asoc.total_flight > 0) &&
13329                             (stcb->asoc.stream_queue_cnt < SCTP_MAX_DATA_BUNDLING) &&
13330                             (un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD))) {
13331                                 /*-
13332                                  * Ok, Nagle is set on and we have data outstanding.
13333                                  * Don't send anything and let SACKs drive out the
13334                                  * data unless we have a "full" segment to send.
13335                                  */
13336                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
13337                                         sctp_log_nagle_event(stcb, SCTP_NAGLE_APPLIED);
13338                                 }
13339                                 SCTP_STAT_INCR(sctps_naglequeued);
13340                                 nagle_applies = 1;
13341                         } else {
13342                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
13343                                         if (sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY))
13344                                                 sctp_log_nagle_event(stcb, SCTP_NAGLE_SKIPPED);
13345                                 }
13346                                 SCTP_STAT_INCR(sctps_naglesent);
13347                                 nagle_applies = 0;
13348                         }
13349                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13350                                 sctp_misc_ints(SCTP_CWNDLOG_PRESEND, queue_only_for_init, queue_only,
13351                                     nagle_applies, un_sent);
13352                                 sctp_misc_ints(SCTP_CWNDLOG_PRESEND, stcb->asoc.total_output_queue_size,
13353                                     stcb->asoc.total_flight,
13354                                     stcb->asoc.chunks_on_out_queue, stcb->asoc.total_flight_count);
13355                         }
13356                         if (queue_only_for_init)
13357                                 queue_only_for_init = 0;
13358                         if ((queue_only == 0) && (nagle_applies == 0)) {
13359                                 /*-
13360                                  * need to start chunk output
13361                                  * before blocking.. note that if
13362                                  * a lock is already applied, then
13363                                  * the input via the net is happening
13364                                  * and I don't need to start output :-D
13365                                  */
13366                                 NET_EPOCH_ENTER(et);
13367                                 if (hold_tcblock == 0) {
13368                                         if (SCTP_TCB_TRYLOCK(stcb)) {
13369                                                 hold_tcblock = 1;
13370                                                 sctp_chunk_output(inp,
13371                                                     stcb,
13372                                                     SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13373                                         }
13374                                 } else {
13375                                         sctp_chunk_output(inp,
13376                                             stcb,
13377                                             SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13378                                 }
13379                                 NET_EPOCH_EXIT(et);
13380                         }
13381                         if (hold_tcblock == 1) {
13382                                 SCTP_TCB_UNLOCK(stcb);
13383                                 hold_tcblock = 0;
13384                         }
13385                         SOCKBUF_LOCK(&so->so_snd);
13386                         /*-
13387                          * This is a bit strange, but I think it will
13388                          * work. The total_output_queue_size is locked and
13389                          * protected by the TCB_LOCK, which we just released.
13390                          * There is a race that can occur between releasing it
13391                          * above, and me getting the socket lock, where sacks
13392                          * come in but we have not put the SB_WAIT on the
13393                          * so_snd buffer to get the wakeup. After the LOCK
13394                          * is applied the sack_processing will also need to
13395                          * LOCK the so->so_snd to do the actual sowwakeup(). So
13396                          * once we have the socket buffer lock if we recheck the
13397                          * size we KNOW we will get to sleep safely with the
13398                          * wakeup flag in place.
13399                          */
13400                         inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * SCTP_DATA_CHUNK_OVERHEAD(stcb));
13401                         if (SCTP_SB_LIMIT_SND(so) <= (inqueue_bytes +
13402                             min(SCTP_BASE_SYSCTL(sctp_add_more_threshold), SCTP_SB_LIMIT_SND(so)))) {
13403                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13404                                         sctp_log_block(SCTP_BLOCK_LOG_INTO_BLK,
13405                                             asoc, uio->uio_resid);
13406                                 }
13407                                 be.error = 0;
13408                                 stcb->block_entry = &be;
13409                                 error = sbwait(&so->so_snd);
13410                                 stcb->block_entry = NULL;
13411
13412                                 if (error || so->so_error || be.error) {
13413                                         if (error == 0) {
13414                                                 if (so->so_error)
13415                                                         error = so->so_error;
13416                                                 if (be.error) {
13417                                                         error = be.error;
13418                                                 }
13419                                         }
13420                                         SOCKBUF_UNLOCK(&so->so_snd);
13421                                         SCTP_TCB_SEND_LOCK(stcb);
13422                                         if (((stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) == 0) &&
13423                                             ((stcb->asoc.state & SCTP_STATE_WAS_ABORTED) == 0) &&
13424                                             (sp != NULL)) {
13425                                                 sp->processing = 0;
13426                                         }
13427                                         SCTP_TCB_SEND_UNLOCK(stcb);
13428                                         goto out_unlocked;
13429                                 }
13430
13431                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13432                                         sctp_log_block(SCTP_BLOCK_LOG_OUTOF_BLK,
13433                                             asoc, stcb->asoc.total_output_queue_size);
13434                                 }
13435                         }
13436                         SOCKBUF_UNLOCK(&so->so_snd);
13437                         SCTP_TCB_SEND_LOCK(stcb);
13438                         if ((stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) ||
13439                             (stcb->asoc.state & SCTP_STATE_WAS_ABORTED)) {
13440                                 SCTP_TCB_SEND_UNLOCK(stcb);
13441                                 goto out_unlocked;
13442                         }
13443                         SCTP_TCB_SEND_UNLOCK(stcb);
13444                 }
13445                 SCTP_TCB_SEND_LOCK(stcb);
13446                 if ((stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) ||
13447                     (stcb->asoc.state & SCTP_STATE_WAS_ABORTED)) {
13448                         SCTP_TCB_SEND_UNLOCK(stcb);
13449                         goto out_unlocked;
13450                 }
13451                 if (sp) {
13452                         if (sp->msg_is_complete == 0) {
13453                                 strm->last_msg_incomplete = 1;
13454                                 if (stcb->asoc.idata_supported == 0) {
13455                                         asoc->stream_locked = 1;
13456                                         asoc->stream_locked_on = srcv->sinfo_stream;
13457                                 }
13458                         } else {
13459                                 sp->sender_all_done = 1;
13460                                 strm->last_msg_incomplete = 0;
13461                                 asoc->stream_locked = 0;
13462                         }
13463                         sp->processing = 0;
13464                 } else {
13465                         SCTP_PRINTF("Huh no sp TSNH?\n");
13466                         strm->last_msg_incomplete = 0;
13467                         asoc->stream_locked = 0;
13468                 }
13469                 SCTP_TCB_SEND_UNLOCK(stcb);
13470                 if (uio->uio_resid == 0) {
13471                         got_all_of_the_send = 1;
13472                 }
13473         } else {
13474                 /* We send in a 0, since we do NOT have any locks */
13475                 error = sctp_msg_append(stcb, net, top, srcv, 0);
13476                 top = NULL;
13477                 if (sinfo_flags & SCTP_EOF) {
13478                         got_all_of_the_send = 1;
13479                 }
13480         }
13481         if (error) {
13482                 goto out;
13483         }
13484 dataless_eof:
13485         /* EOF thing ? */
13486         if ((sinfo_flags & SCTP_EOF) &&
13487             (got_all_of_the_send == 1)) {
13488                 SCTP_STAT_INCR(sctps_sends_with_eof);
13489                 error = 0;
13490                 if (hold_tcblock == 0) {
13491                         SCTP_TCB_LOCK(stcb);
13492                         hold_tcblock = 1;
13493                 }
13494                 if (TAILQ_EMPTY(&asoc->send_queue) &&
13495                     TAILQ_EMPTY(&asoc->sent_queue) &&
13496                     sctp_is_there_unsent_data(stcb, SCTP_SO_LOCKED) == 0) {
13497                         if ((*asoc->ss_functions.sctp_ss_is_user_msgs_incomplete) (stcb, asoc)) {
13498                                 goto abort_anyway;
13499                         }
13500                         /* there is nothing queued to send, so I'm done... */
13501                         if ((SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_SENT) &&
13502                             (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
13503                             (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
13504                                 struct sctp_nets *netp;
13505
13506                                 /* only send SHUTDOWN the first time through */
13507                                 if (SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) {
13508                                         SCTP_STAT_DECR_GAUGE32(sctps_currestab);
13509                                 }
13510                                 SCTP_SET_STATE(stcb, SCTP_STATE_SHUTDOWN_SENT);
13511                                 sctp_stop_timers_for_shutdown(stcb);
13512                                 if (stcb->asoc.alternate) {
13513                                         netp = stcb->asoc.alternate;
13514                                 } else {
13515                                         netp = stcb->asoc.primary_destination;
13516                                 }
13517                                 sctp_send_shutdown(stcb, netp);
13518                                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb,
13519                                     netp);
13520                                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
13521                                     NULL);
13522                         }
13523                 } else {
13524                         /*-
13525                          * we still got (or just got) data to send, so set
13526                          * SHUTDOWN_PENDING
13527                          */
13528                         /*-
13529                          * XXX sockets draft says that SCTP_EOF should be
13530                          * sent with no data.  currently, we will allow user
13531                          * data to be sent first and move to
13532                          * SHUTDOWN-PENDING
13533                          */
13534                         if ((SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_SENT) &&
13535                             (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
13536                             (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
13537                                 if (hold_tcblock == 0) {
13538                                         SCTP_TCB_LOCK(stcb);
13539                                         hold_tcblock = 1;
13540                                 }
13541                                 if ((*asoc->ss_functions.sctp_ss_is_user_msgs_incomplete) (stcb, asoc)) {
13542                                         SCTP_ADD_SUBSTATE(stcb, SCTP_STATE_PARTIAL_MSG_LEFT);
13543                                 }
13544                                 SCTP_ADD_SUBSTATE(stcb, SCTP_STATE_SHUTDOWN_PENDING);
13545                                 if (TAILQ_EMPTY(&asoc->send_queue) &&
13546                                     TAILQ_EMPTY(&asoc->sent_queue) &&
13547                                     (asoc->state & SCTP_STATE_PARTIAL_MSG_LEFT)) {
13548                                         struct mbuf *op_err;
13549                                         char msg[SCTP_DIAG_INFO_LEN];
13550
13551                         abort_anyway:
13552                                         if (free_cnt_applied) {
13553                                                 atomic_add_int(&stcb->asoc.refcnt, -1);
13554                                                 free_cnt_applied = 0;
13555                                         }
13556                                         SCTP_SNPRINTF(msg, sizeof(msg),
13557                                             "%s:%d at %s", __FILE__, __LINE__, __func__);
13558                                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
13559                                             msg);
13560                                         NET_EPOCH_ENTER(et);
13561                                         sctp_abort_an_association(stcb->sctp_ep, stcb,
13562                                             op_err, false, SCTP_SO_LOCKED);
13563                                         NET_EPOCH_EXIT(et);
13564                                         /*
13565                                          * now relock the stcb so everything
13566                                          * is sane
13567                                          */
13568                                         hold_tcblock = 0;
13569                                         stcb = NULL;
13570                                         goto out;
13571                                 }
13572                                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
13573                                     NULL);
13574                                 sctp_feature_off(inp, SCTP_PCB_FLAGS_NODELAY);
13575                         }
13576                 }
13577         }
13578 skip_out_eof:
13579         if (!TAILQ_EMPTY(&stcb->asoc.control_send_queue)) {
13580                 some_on_control = 1;
13581         }
13582         if (queue_only_for_init) {
13583                 if (hold_tcblock == 0) {
13584                         SCTP_TCB_LOCK(stcb);
13585                         hold_tcblock = 1;
13586                 }
13587                 if (SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) {
13588                         /* a collision took us forward? */
13589                         queue_only = 0;
13590                 } else {
13591                         NET_EPOCH_ENTER(et);
13592                         sctp_send_initiate(inp, stcb, SCTP_SO_LOCKED);
13593                         NET_EPOCH_EXIT(et);
13594                         SCTP_SET_STATE(stcb, SCTP_STATE_COOKIE_WAIT);
13595                         queue_only = 1;
13596                 }
13597         }
13598         if ((net->flight_size > net->cwnd) &&
13599             (stcb->asoc.sctp_cmt_on_off == 0)) {
13600                 SCTP_STAT_INCR(sctps_send_cwnd_avoid);
13601                 queue_only = 1;
13602         } else if (asoc->ifp_had_enobuf) {
13603                 SCTP_STAT_INCR(sctps_ifnomemqueued);
13604                 if (net->flight_size > (2 * net->mtu)) {
13605                         queue_only = 1;
13606                 }
13607                 asoc->ifp_had_enobuf = 0;
13608         }
13609         un_sent = stcb->asoc.total_output_queue_size - stcb->asoc.total_flight;
13610         if ((sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY)) &&
13611             (stcb->asoc.total_flight > 0) &&
13612             (stcb->asoc.stream_queue_cnt < SCTP_MAX_DATA_BUNDLING) &&
13613             (un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD))) {
13614                 /*-
13615                  * Ok, Nagle is set on and we have data outstanding.
13616                  * Don't send anything and let SACKs drive out the
13617                  * data unless wen have a "full" segment to send.
13618                  */
13619                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
13620                         sctp_log_nagle_event(stcb, SCTP_NAGLE_APPLIED);
13621                 }
13622                 SCTP_STAT_INCR(sctps_naglequeued);
13623                 nagle_applies = 1;
13624         } else {
13625                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
13626                         if (sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY))
13627                                 sctp_log_nagle_event(stcb, SCTP_NAGLE_SKIPPED);
13628                 }
13629                 SCTP_STAT_INCR(sctps_naglesent);
13630                 nagle_applies = 0;
13631         }
13632         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13633                 sctp_misc_ints(SCTP_CWNDLOG_PRESEND, queue_only_for_init, queue_only,
13634                     nagle_applies, un_sent);
13635                 sctp_misc_ints(SCTP_CWNDLOG_PRESEND, stcb->asoc.total_output_queue_size,
13636                     stcb->asoc.total_flight,
13637                     stcb->asoc.chunks_on_out_queue, stcb->asoc.total_flight_count);
13638         }
13639         NET_EPOCH_ENTER(et);
13640         if ((queue_only == 0) && (nagle_applies == 0) && (stcb->asoc.peers_rwnd && un_sent)) {
13641                 /* we can attempt to send too. */
13642                 if (hold_tcblock == 0) {
13643                         /*
13644                          * If there is activity recv'ing sacks no need to
13645                          * send
13646                          */
13647                         if (SCTP_TCB_TRYLOCK(stcb)) {
13648                                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13649                                 hold_tcblock = 1;
13650                         }
13651                 } else {
13652                         sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13653                 }
13654         } else if ((queue_only == 0) &&
13655                     (stcb->asoc.peers_rwnd == 0) &&
13656             (stcb->asoc.total_flight == 0)) {
13657                 /* We get to have a probe outstanding */
13658                 if (hold_tcblock == 0) {
13659                         hold_tcblock = 1;
13660                         SCTP_TCB_LOCK(stcb);
13661                 }
13662                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13663         } else if (some_on_control) {
13664                 int num_out, reason, frag_point;
13665
13666                 /* Here we do control only */
13667                 if (hold_tcblock == 0) {
13668                         hold_tcblock = 1;
13669                         SCTP_TCB_LOCK(stcb);
13670                 }
13671                 frag_point = sctp_get_frag_point(stcb, &stcb->asoc);
13672                 (void)sctp_med_chunk_output(inp, stcb, &stcb->asoc, &num_out,
13673                     &reason, 1, 1, &now, &now_filled, frag_point, SCTP_SO_LOCKED);
13674         }
13675         NET_EPOCH_EXIT(et);
13676         SCTPDBG(SCTP_DEBUG_OUTPUT1, "USR Send complete qo:%d prw:%d unsent:%d tf:%d cooq:%d toqs:%d err:%d\n",
13677             queue_only, stcb->asoc.peers_rwnd, un_sent,
13678             stcb->asoc.total_flight, stcb->asoc.chunks_on_out_queue,
13679             stcb->asoc.total_output_queue_size, error);
13680
13681 out:
13682 out_unlocked:
13683
13684         if (local_soresv && stcb) {
13685                 atomic_subtract_int(&stcb->asoc.sb_send_resv, (int)sndlen);
13686         }
13687         if (create_lock_applied) {
13688                 SCTP_ASOC_CREATE_UNLOCK(inp);
13689         }
13690         if ((stcb) && hold_tcblock) {
13691                 SCTP_TCB_UNLOCK(stcb);
13692         }
13693         if (stcb && free_cnt_applied) {
13694                 atomic_add_int(&stcb->asoc.refcnt, -1);
13695         }
13696 #ifdef INVARIANTS
13697         if (stcb) {
13698                 if (mtx_owned(&stcb->tcb_mtx)) {
13699                         panic("Leaving with tcb mtx owned?");
13700                 }
13701                 if (mtx_owned(&stcb->tcb_send_mtx)) {
13702                         panic("Leaving with tcb send mtx owned?");
13703                 }
13704         }
13705 #endif
13706         if (top) {
13707                 sctp_m_freem(top);
13708         }
13709         if (control) {
13710                 sctp_m_freem(control);
13711         }
13712         return (error);
13713 }
13714
13715 /*
13716  * generate an AUTHentication chunk, if required
13717  */
13718 struct mbuf *
13719 sctp_add_auth_chunk(struct mbuf *m, struct mbuf **m_end,
13720     struct sctp_auth_chunk **auth_ret, uint32_t *offset,
13721     struct sctp_tcb *stcb, uint8_t chunk)
13722 {
13723         struct mbuf *m_auth;
13724         struct sctp_auth_chunk *auth;
13725         int chunk_len;
13726         struct mbuf *cn;
13727
13728         if ((m_end == NULL) || (auth_ret == NULL) || (offset == NULL) ||
13729             (stcb == NULL))
13730                 return (m);
13731
13732         if (stcb->asoc.auth_supported == 0) {
13733                 return (m);
13734         }
13735         /* does the requested chunk require auth? */
13736         if (!sctp_auth_is_required_chunk(chunk, stcb->asoc.peer_auth_chunks)) {
13737                 return (m);
13738         }
13739         m_auth = sctp_get_mbuf_for_msg(sizeof(*auth), 0, M_NOWAIT, 1, MT_HEADER);
13740         if (m_auth == NULL) {
13741                 /* no mbuf's */
13742                 return (m);
13743         }
13744         /* reserve some space if this will be the first mbuf */
13745         if (m == NULL)
13746                 SCTP_BUF_RESV_UF(m_auth, SCTP_MIN_OVERHEAD);
13747         /* fill in the AUTH chunk details */
13748         auth = mtod(m_auth, struct sctp_auth_chunk *);
13749         memset(auth, 0, sizeof(*auth));
13750         auth->ch.chunk_type = SCTP_AUTHENTICATION;
13751         auth->ch.chunk_flags = 0;
13752         chunk_len = sizeof(*auth) +
13753             sctp_get_hmac_digest_len(stcb->asoc.peer_hmac_id);
13754         auth->ch.chunk_length = htons(chunk_len);
13755         auth->hmac_id = htons(stcb->asoc.peer_hmac_id);
13756         /* key id and hmac digest will be computed and filled in upon send */
13757
13758         /* save the offset where the auth was inserted into the chain */
13759         *offset = 0;
13760         for (cn = m; cn; cn = SCTP_BUF_NEXT(cn)) {
13761                 *offset += SCTP_BUF_LEN(cn);
13762         }
13763
13764         /* update length and return pointer to the auth chunk */
13765         SCTP_BUF_LEN(m_auth) = chunk_len;
13766         m = sctp_copy_mbufchain(m_auth, m, m_end, 1, chunk_len, 0);
13767         if (auth_ret != NULL)
13768                 *auth_ret = auth;
13769
13770         return (m);
13771 }
13772
13773 #ifdef INET6
13774 int
13775 sctp_v6src_match_nexthop(struct sockaddr_in6 *src6, sctp_route_t *ro)
13776 {
13777         struct nd_prefix *pfx = NULL;
13778         struct nd_pfxrouter *pfxrtr = NULL;
13779         struct sockaddr_in6 gw6;
13780
13781         if (ro == NULL || ro->ro_nh == NULL || src6->sin6_family != AF_INET6)
13782                 return (0);
13783
13784         /* get prefix entry of address */
13785         ND6_RLOCK();
13786         LIST_FOREACH(pfx, &MODULE_GLOBAL(nd_prefix), ndpr_entry) {
13787                 if (pfx->ndpr_stateflags & NDPRF_DETACHED)
13788                         continue;
13789                 if (IN6_ARE_MASKED_ADDR_EQUAL(&pfx->ndpr_prefix.sin6_addr,
13790                     &src6->sin6_addr, &pfx->ndpr_mask))
13791                         break;
13792         }
13793         /* no prefix entry in the prefix list */
13794         if (pfx == NULL) {
13795                 ND6_RUNLOCK();
13796                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "No prefix entry for ");
13797                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)src6);
13798                 return (0);
13799         }
13800
13801         SCTPDBG(SCTP_DEBUG_OUTPUT2, "v6src_match_nexthop(), Prefix entry is ");
13802         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)src6);
13803
13804         /* search installed gateway from prefix entry */
13805         LIST_FOREACH(pfxrtr, &pfx->ndpr_advrtrs, pfr_entry) {
13806                 memset(&gw6, 0, sizeof(struct sockaddr_in6));
13807                 gw6.sin6_family = AF_INET6;
13808                 gw6.sin6_len = sizeof(struct sockaddr_in6);
13809                 memcpy(&gw6.sin6_addr, &pfxrtr->router->rtaddr,
13810                     sizeof(struct in6_addr));
13811                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "prefix router is ");
13812                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)&gw6);
13813                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "installed router is ");
13814                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, &ro->ro_nh->gw_sa);
13815                 if (sctp_cmpaddr((struct sockaddr *)&gw6, &ro->ro_nh->gw_sa)) {
13816                         ND6_RUNLOCK();
13817                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "pfxrouter is installed\n");
13818                         return (1);
13819                 }
13820         }
13821         ND6_RUNLOCK();
13822         SCTPDBG(SCTP_DEBUG_OUTPUT2, "pfxrouter is not installed\n");
13823         return (0);
13824 }
13825 #endif
13826
13827 int
13828 sctp_v4src_match_nexthop(struct sctp_ifa *sifa, sctp_route_t *ro)
13829 {
13830 #ifdef INET
13831         struct sockaddr_in *sin, *mask;
13832         struct ifaddr *ifa;
13833         struct in_addr srcnetaddr, gwnetaddr;
13834
13835         if (ro == NULL || ro->ro_nh == NULL ||
13836             sifa->address.sa.sa_family != AF_INET) {
13837                 return (0);
13838         }
13839         ifa = (struct ifaddr *)sifa->ifa;
13840         mask = (struct sockaddr_in *)(ifa->ifa_netmask);
13841         sin = &sifa->address.sin;
13842         srcnetaddr.s_addr = (sin->sin_addr.s_addr & mask->sin_addr.s_addr);
13843         SCTPDBG(SCTP_DEBUG_OUTPUT1, "match_nexthop4: src address is ");
13844         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, &sifa->address.sa);
13845         SCTPDBG(SCTP_DEBUG_OUTPUT1, "network address is %x\n", srcnetaddr.s_addr);
13846
13847         sin = &ro->ro_nh->gw4_sa;
13848         gwnetaddr.s_addr = (sin->sin_addr.s_addr & mask->sin_addr.s_addr);
13849         SCTPDBG(SCTP_DEBUG_OUTPUT1, "match_nexthop4: nexthop is ");
13850         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, &ro->ro_nh->gw_sa);
13851         SCTPDBG(SCTP_DEBUG_OUTPUT1, "network address is %x\n", gwnetaddr.s_addr);
13852         if (srcnetaddr.s_addr == gwnetaddr.s_addr) {
13853                 return (1);
13854         }
13855 #endif
13856         return (0);
13857 }