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);
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_nets *net,
7146     struct sctp_stream_out *strq,
7147     uint32_t space_left,
7148     uint32_t frag_point,
7149     int *giveup,
7150     int eeor_mode,
7151     int *bail,
7152     int so_locked)
7153 {
7154         /* Move from the stream to the send_queue keeping track of the total */
7155         struct sctp_association *asoc;
7156         struct sctp_stream_queue_pending *sp;
7157         struct sctp_tmit_chunk *chk;
7158         struct sctp_data_chunk *dchkh = NULL;
7159         struct sctp_idata_chunk *ndchkh = NULL;
7160         uint32_t to_move, length;
7161         int leading;
7162         uint8_t rcv_flags = 0;
7163         uint8_t some_taken;
7164         uint8_t send_lock_up = 0;
7165
7166         SCTP_TCB_LOCK_ASSERT(stcb);
7167         asoc = &stcb->asoc;
7168 one_more_time:
7169         /* sa_ignore FREED_MEMORY */
7170         sp = TAILQ_FIRST(&strq->outqueue);
7171         if (sp == NULL) {
7172                 if (send_lock_up == 0) {
7173                         SCTP_TCB_SEND_LOCK(stcb);
7174                         send_lock_up = 1;
7175                 }
7176                 sp = TAILQ_FIRST(&strq->outqueue);
7177                 if (sp) {
7178                         goto one_more_time;
7179                 }
7180                 if ((sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_EXPLICIT_EOR) == 0) &&
7181                     (stcb->asoc.idata_supported == 0) &&
7182                     (strq->last_msg_incomplete)) {
7183                         SCTP_PRINTF("Huh? Stream:%d lm_in_c=%d but queue is NULL\n",
7184                             strq->sid,
7185                             strq->last_msg_incomplete);
7186                         strq->last_msg_incomplete = 0;
7187                 }
7188                 to_move = 0;
7189                 if (send_lock_up) {
7190                         SCTP_TCB_SEND_UNLOCK(stcb);
7191                         send_lock_up = 0;
7192                 }
7193                 goto out_of;
7194         }
7195         if ((sp->msg_is_complete) && (sp->length == 0)) {
7196                 if (sp->sender_all_done) {
7197                         /*
7198                          * We are doing deferred cleanup. Last time through
7199                          * when we took all the data the sender_all_done was
7200                          * not set.
7201                          */
7202                         if ((sp->put_last_out == 0) && (sp->discard_rest == 0)) {
7203                                 SCTP_PRINTF("Gak, put out entire msg with NO end!-1\n");
7204                                 SCTP_PRINTF("sender_done:%d len:%d msg_comp:%d put_last_out:%d send_lock:%d\n",
7205                                     sp->sender_all_done,
7206                                     sp->length,
7207                                     sp->msg_is_complete,
7208                                     sp->put_last_out,
7209                                     send_lock_up);
7210                         }
7211                         if (send_lock_up == 0) {
7212                                 SCTP_TCB_SEND_LOCK(stcb);
7213                                 send_lock_up = 1;
7214                         }
7215                         atomic_subtract_int(&asoc->stream_queue_cnt, 1);
7216                         TAILQ_REMOVE(&strq->outqueue, sp, next);
7217                         stcb->asoc.ss_functions.sctp_ss_remove_from_stream(stcb, asoc, strq, sp);
7218                         if ((strq->state == SCTP_STREAM_RESET_PENDING) &&
7219                             (strq->chunks_on_queues == 0) &&
7220                             TAILQ_EMPTY(&strq->outqueue)) {
7221                                 stcb->asoc.trigger_reset = 1;
7222                         }
7223                         if (sp->net) {
7224                                 sctp_free_remote_addr(sp->net);
7225                                 sp->net = NULL;
7226                         }
7227                         if (sp->data) {
7228                                 sctp_m_freem(sp->data);
7229                                 sp->data = NULL;
7230                         }
7231                         sctp_free_a_strmoq(stcb, sp, so_locked);
7232                         /* we can't be locked to it */
7233                         if (send_lock_up) {
7234                                 SCTP_TCB_SEND_UNLOCK(stcb);
7235                                 send_lock_up = 0;
7236                         }
7237                         /* back to get the next msg */
7238                         goto one_more_time;
7239                 } else {
7240                         /*
7241                          * sender just finished this but still holds a
7242                          * reference
7243                          */
7244                         *giveup = 1;
7245                         to_move = 0;
7246                         goto out_of;
7247                 }
7248         } else {
7249                 /* is there some to get */
7250                 if (sp->length == 0) {
7251                         /* no */
7252                         *giveup = 1;
7253                         to_move = 0;
7254                         goto out_of;
7255                 } else if (sp->discard_rest) {
7256                         if (send_lock_up == 0) {
7257                                 SCTP_TCB_SEND_LOCK(stcb);
7258                                 send_lock_up = 1;
7259                         }
7260                         /* Whack down the size */
7261                         atomic_subtract_int(&stcb->asoc.total_output_queue_size, sp->length);
7262                         if ((stcb->sctp_socket != NULL) &&
7263                             ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
7264                             (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL))) {
7265                                 atomic_subtract_int(&stcb->sctp_socket->so_snd.sb_cc, sp->length);
7266                         }
7267                         if (sp->data) {
7268                                 sctp_m_freem(sp->data);
7269                                 sp->data = NULL;
7270                                 sp->tail_mbuf = NULL;
7271                         }
7272                         sp->length = 0;
7273                         sp->some_taken = 1;
7274                         *giveup = 1;
7275                         to_move = 0;
7276                         goto out_of;
7277                 }
7278         }
7279         some_taken = sp->some_taken;
7280 re_look:
7281         length = sp->length;
7282         if (sp->msg_is_complete) {
7283                 /* The message is complete */
7284                 to_move = min(length, frag_point);
7285                 if (to_move == length) {
7286                         /* All of it fits in the MTU */
7287                         if (sp->some_taken) {
7288                                 rcv_flags |= SCTP_DATA_LAST_FRAG;
7289                         } else {
7290                                 rcv_flags |= SCTP_DATA_NOT_FRAG;
7291                         }
7292                         sp->put_last_out = 1;
7293                         if (sp->sinfo_flags & SCTP_SACK_IMMEDIATELY) {
7294                                 rcv_flags |= SCTP_DATA_SACK_IMMEDIATELY;
7295                         }
7296                 } else {
7297                         /* Not all of it fits, we fragment */
7298                         if (sp->some_taken == 0) {
7299                                 rcv_flags |= SCTP_DATA_FIRST_FRAG;
7300                         }
7301                         sp->some_taken = 1;
7302                 }
7303         } else {
7304                 to_move = sctp_can_we_split_this(stcb, length, space_left, frag_point, eeor_mode);
7305                 if (to_move) {
7306                         /*-
7307                          * We use a snapshot of length in case it
7308                          * is expanding during the compare.
7309                          */
7310                         uint32_t llen;
7311
7312                         llen = length;
7313                         if (to_move >= llen) {
7314                                 to_move = llen;
7315                                 if (send_lock_up == 0) {
7316                                         /*-
7317                                          * We are taking all of an incomplete msg
7318                                          * thus we need a send lock.
7319                                          */
7320                                         SCTP_TCB_SEND_LOCK(stcb);
7321                                         send_lock_up = 1;
7322                                         if (sp->msg_is_complete) {
7323                                                 /*
7324                                                  * the sender finished the
7325                                                  * msg
7326                                                  */
7327                                                 goto re_look;
7328                                         }
7329                                 }
7330                         }
7331                         if (sp->some_taken == 0) {
7332                                 rcv_flags |= SCTP_DATA_FIRST_FRAG;
7333                                 sp->some_taken = 1;
7334                         }
7335                 } else {
7336                         /* Nothing to take. */
7337                         *giveup = 1;
7338                         to_move = 0;
7339                         goto out_of;
7340                 }
7341         }
7342
7343         /* If we reach here, we can copy out a chunk */
7344         sctp_alloc_a_chunk(stcb, chk);
7345         if (chk == NULL) {
7346                 /* No chunk memory */
7347                 *giveup = 1;
7348                 to_move = 0;
7349                 goto out_of;
7350         }
7351         /*
7352          * Setup for unordered if needed by looking at the user sent info
7353          * flags.
7354          */
7355         if (sp->sinfo_flags & SCTP_UNORDERED) {
7356                 rcv_flags |= SCTP_DATA_UNORDERED;
7357         }
7358         if (SCTP_BASE_SYSCTL(sctp_enable_sack_immediately) &&
7359             (sp->sinfo_flags & SCTP_EOF) == SCTP_EOF) {
7360                 rcv_flags |= SCTP_DATA_SACK_IMMEDIATELY;
7361         }
7362         /* clear out the chunk before setting up */
7363         memset(chk, 0, sizeof(*chk));
7364         chk->rec.data.rcv_flags = rcv_flags;
7365
7366         if (to_move >= length) {
7367                 /* we think we can steal the whole thing */
7368                 if ((sp->sender_all_done == 0) && (send_lock_up == 0)) {
7369                         SCTP_TCB_SEND_LOCK(stcb);
7370                         send_lock_up = 1;
7371                 }
7372                 if (to_move < sp->length) {
7373                         /* bail, it changed */
7374                         goto dont_do_it;
7375                 }
7376                 chk->data = sp->data;
7377                 chk->last_mbuf = sp->tail_mbuf;
7378                 /* register the stealing */
7379                 sp->data = sp->tail_mbuf = NULL;
7380         } else {
7381                 struct mbuf *m;
7382
7383 dont_do_it:
7384                 chk->data = SCTP_M_COPYM(sp->data, 0, to_move, M_NOWAIT);
7385                 chk->last_mbuf = NULL;
7386                 if (chk->data == NULL) {
7387                         sp->some_taken = some_taken;
7388                         sctp_free_a_chunk(stcb, chk, so_locked);
7389                         *bail = 1;
7390                         to_move = 0;
7391                         goto out_of;
7392                 }
7393 #ifdef SCTP_MBUF_LOGGING
7394                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
7395                         sctp_log_mbc(chk->data, SCTP_MBUF_ICOPY);
7396                 }
7397 #endif
7398                 /* Pull off the data */
7399                 m_adj(sp->data, to_move);
7400                 /* Now lets work our way down and compact it */
7401                 m = sp->data;
7402                 while (m && (SCTP_BUF_LEN(m) == 0)) {
7403                         sp->data = SCTP_BUF_NEXT(m);
7404                         SCTP_BUF_NEXT(m) = NULL;
7405                         if (sp->tail_mbuf == m) {
7406                                 /*-
7407                                  * Freeing tail? TSNH since
7408                                  * we supposedly were taking less
7409                                  * than the sp->length.
7410                                  */
7411 #ifdef INVARIANTS
7412                                 panic("Huh, freing tail? - TSNH");
7413 #else
7414                                 SCTP_PRINTF("Huh, freeing tail? - TSNH\n");
7415                                 sp->tail_mbuf = sp->data = NULL;
7416                                 sp->length = 0;
7417 #endif
7418                         }
7419                         sctp_m_free(m);
7420                         m = sp->data;
7421                 }
7422         }
7423         if (SCTP_BUF_IS_EXTENDED(chk->data)) {
7424                 chk->copy_by_ref = 1;
7425         } else {
7426                 chk->copy_by_ref = 0;
7427         }
7428         /*
7429          * get last_mbuf and counts of mb usage This is ugly but hopefully
7430          * its only one mbuf.
7431          */
7432         if (chk->last_mbuf == NULL) {
7433                 chk->last_mbuf = chk->data;
7434                 while (SCTP_BUF_NEXT(chk->last_mbuf) != NULL) {
7435                         chk->last_mbuf = SCTP_BUF_NEXT(chk->last_mbuf);
7436                 }
7437         }
7438
7439         if (to_move > length) {
7440                 /*- This should not happen either
7441                  * since we always lower to_move to the size
7442                  * of sp->length if its larger.
7443                  */
7444 #ifdef INVARIANTS
7445                 panic("Huh, how can to_move be larger?");
7446 #else
7447                 SCTP_PRINTF("Huh, how can to_move be larger?\n");
7448                 sp->length = 0;
7449 #endif
7450         } else {
7451                 atomic_subtract_int(&sp->length, to_move);
7452         }
7453         leading = SCTP_DATA_CHUNK_OVERHEAD(stcb);
7454         if (M_LEADINGSPACE(chk->data) < leading) {
7455                 /* Not enough room for a chunk header, get some */
7456                 struct mbuf *m;
7457
7458                 m = sctp_get_mbuf_for_msg(1, 0, M_NOWAIT, 1, MT_DATA);
7459                 if (m == NULL) {
7460                         /*
7461                          * we're in trouble here. _PREPEND below will free
7462                          * all the data if there is no leading space, so we
7463                          * must put the data back and restore.
7464                          */
7465                         if (send_lock_up == 0) {
7466                                 SCTP_TCB_SEND_LOCK(stcb);
7467                                 send_lock_up = 1;
7468                         }
7469                         if (sp->data == NULL) {
7470                                 /* unsteal the data */
7471                                 sp->data = chk->data;
7472                                 sp->tail_mbuf = chk->last_mbuf;
7473                         } else {
7474                                 struct mbuf *m_tmp;
7475
7476                                 /* reassemble the data */
7477                                 m_tmp = sp->data;
7478                                 sp->data = chk->data;
7479                                 SCTP_BUF_NEXT(chk->last_mbuf) = m_tmp;
7480                         }
7481                         sp->some_taken = some_taken;
7482                         atomic_add_int(&sp->length, to_move);
7483                         chk->data = NULL;
7484                         *bail = 1;
7485                         sctp_free_a_chunk(stcb, chk, so_locked);
7486                         to_move = 0;
7487                         goto out_of;
7488                 } else {
7489                         SCTP_BUF_LEN(m) = 0;
7490                         SCTP_BUF_NEXT(m) = chk->data;
7491                         chk->data = m;
7492                         M_ALIGN(chk->data, 4);
7493                 }
7494         }
7495         SCTP_BUF_PREPEND(chk->data, SCTP_DATA_CHUNK_OVERHEAD(stcb), M_NOWAIT);
7496         if (chk->data == NULL) {
7497                 /* HELP, TSNH since we assured it would not above? */
7498 #ifdef INVARIANTS
7499                 panic("prepend failes HELP?");
7500 #else
7501                 SCTP_PRINTF("prepend fails HELP?\n");
7502                 sctp_free_a_chunk(stcb, chk, so_locked);
7503 #endif
7504                 *bail = 1;
7505                 to_move = 0;
7506                 goto out_of;
7507         }
7508         sctp_snd_sb_alloc(stcb, SCTP_DATA_CHUNK_OVERHEAD(stcb));
7509         chk->book_size = chk->send_size = (uint16_t)(to_move + SCTP_DATA_CHUNK_OVERHEAD(stcb));
7510         chk->book_size_scale = 0;
7511         chk->sent = SCTP_DATAGRAM_UNSENT;
7512
7513         chk->flags = 0;
7514         chk->asoc = &stcb->asoc;
7515         chk->pad_inplace = 0;
7516         chk->no_fr_allowed = 0;
7517         if (stcb->asoc.idata_supported == 0) {
7518                 if (rcv_flags & SCTP_DATA_UNORDERED) {
7519                         /* Just use 0. The receiver ignores the values. */
7520                         chk->rec.data.mid = 0;
7521                 } else {
7522                         chk->rec.data.mid = strq->next_mid_ordered;
7523                         if (rcv_flags & SCTP_DATA_LAST_FRAG) {
7524                                 strq->next_mid_ordered++;
7525                         }
7526                 }
7527         } else {
7528                 if (rcv_flags & SCTP_DATA_UNORDERED) {
7529                         chk->rec.data.mid = strq->next_mid_unordered;
7530                         if (rcv_flags & SCTP_DATA_LAST_FRAG) {
7531                                 strq->next_mid_unordered++;
7532                         }
7533                 } else {
7534                         chk->rec.data.mid = strq->next_mid_ordered;
7535                         if (rcv_flags & SCTP_DATA_LAST_FRAG) {
7536                                 strq->next_mid_ordered++;
7537                         }
7538                 }
7539         }
7540         chk->rec.data.sid = sp->sid;
7541         chk->rec.data.ppid = sp->ppid;
7542         chk->rec.data.context = sp->context;
7543         chk->rec.data.doing_fast_retransmit = 0;
7544
7545         chk->rec.data.timetodrop = sp->ts;
7546         chk->flags = sp->act_flags;
7547
7548         if (sp->net) {
7549                 chk->whoTo = sp->net;
7550                 atomic_add_int(&chk->whoTo->ref_count, 1);
7551         } else
7552                 chk->whoTo = NULL;
7553
7554         if (sp->holds_key_ref) {
7555                 chk->auth_keyid = sp->auth_keyid;
7556                 sctp_auth_key_acquire(stcb, chk->auth_keyid);
7557                 chk->holds_key_ref = 1;
7558         }
7559         stcb->asoc.ss_functions.sctp_ss_scheduled(stcb, net, asoc, strq, to_move);
7560         chk->rec.data.tsn = atomic_fetchadd_int(&asoc->sending_seq, 1);
7561         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_AT_SEND_2_OUTQ) {
7562                 sctp_misc_ints(SCTP_STRMOUT_LOG_SEND,
7563                     (uint32_t)(uintptr_t)stcb, sp->length,
7564                     (uint32_t)((chk->rec.data.sid << 16) | (0x0000ffff & chk->rec.data.mid)),
7565                     chk->rec.data.tsn);
7566         }
7567         if (stcb->asoc.idata_supported == 0) {
7568                 dchkh = mtod(chk->data, struct sctp_data_chunk *);
7569         } else {
7570                 ndchkh = mtod(chk->data, struct sctp_idata_chunk *);
7571         }
7572         /*
7573          * Put the rest of the things in place now. Size was done earlier in
7574          * previous loop prior to padding.
7575          */
7576
7577 #ifdef SCTP_ASOCLOG_OF_TSNS
7578         SCTP_TCB_LOCK_ASSERT(stcb);
7579         if (asoc->tsn_out_at >= SCTP_TSN_LOG_SIZE) {
7580                 asoc->tsn_out_at = 0;
7581                 asoc->tsn_out_wrapped = 1;
7582         }
7583         asoc->out_tsnlog[asoc->tsn_out_at].tsn = chk->rec.data.tsn;
7584         asoc->out_tsnlog[asoc->tsn_out_at].strm = chk->rec.data.sid;
7585         asoc->out_tsnlog[asoc->tsn_out_at].seq = chk->rec.data.mid;
7586         asoc->out_tsnlog[asoc->tsn_out_at].sz = chk->send_size;
7587         asoc->out_tsnlog[asoc->tsn_out_at].flgs = chk->rec.data.rcv_flags;
7588         asoc->out_tsnlog[asoc->tsn_out_at].stcb = (void *)stcb;
7589         asoc->out_tsnlog[asoc->tsn_out_at].in_pos = asoc->tsn_out_at;
7590         asoc->out_tsnlog[asoc->tsn_out_at].in_out = 2;
7591         asoc->tsn_out_at++;
7592 #endif
7593         if (stcb->asoc.idata_supported == 0) {
7594                 dchkh->ch.chunk_type = SCTP_DATA;
7595                 dchkh->ch.chunk_flags = chk->rec.data.rcv_flags;
7596                 dchkh->dp.tsn = htonl(chk->rec.data.tsn);
7597                 dchkh->dp.sid = htons(strq->sid);
7598                 dchkh->dp.ssn = htons((uint16_t)chk->rec.data.mid);
7599                 dchkh->dp.ppid = chk->rec.data.ppid;
7600                 dchkh->ch.chunk_length = htons(chk->send_size);
7601         } else {
7602                 ndchkh->ch.chunk_type = SCTP_IDATA;
7603                 ndchkh->ch.chunk_flags = chk->rec.data.rcv_flags;
7604                 ndchkh->dp.tsn = htonl(chk->rec.data.tsn);
7605                 ndchkh->dp.sid = htons(strq->sid);
7606                 ndchkh->dp.reserved = htons(0);
7607                 ndchkh->dp.mid = htonl(chk->rec.data.mid);
7608                 if (sp->fsn == 0)
7609                         ndchkh->dp.ppid_fsn.ppid = chk->rec.data.ppid;
7610                 else
7611                         ndchkh->dp.ppid_fsn.fsn = htonl(sp->fsn);
7612                 sp->fsn++;
7613                 ndchkh->ch.chunk_length = htons(chk->send_size);
7614         }
7615         /* Now advance the chk->send_size by the actual pad needed. */
7616         if (chk->send_size < SCTP_SIZE32(chk->book_size)) {
7617                 /* need a pad */
7618                 struct mbuf *lm;
7619                 int pads;
7620
7621                 pads = SCTP_SIZE32(chk->book_size) - chk->send_size;
7622                 lm = sctp_pad_lastmbuf(chk->data, pads, chk->last_mbuf);
7623                 if (lm != NULL) {
7624                         chk->last_mbuf = lm;
7625                         chk->pad_inplace = 1;
7626                 }
7627                 chk->send_size += pads;
7628         }
7629         if (PR_SCTP_ENABLED(chk->flags)) {
7630                 asoc->pr_sctp_cnt++;
7631         }
7632         if (sp->msg_is_complete && (sp->length == 0) && (sp->sender_all_done)) {
7633                 /* All done pull and kill the message */
7634                 if (sp->put_last_out == 0) {
7635                         SCTP_PRINTF("Gak, put out entire msg with NO end!-2\n");
7636                         SCTP_PRINTF("sender_done:%d len:%d msg_comp:%d put_last_out:%d send_lock:%d\n",
7637                             sp->sender_all_done,
7638                             sp->length,
7639                             sp->msg_is_complete,
7640                             sp->put_last_out,
7641                             send_lock_up);
7642                 }
7643                 if (send_lock_up == 0) {
7644                         SCTP_TCB_SEND_LOCK(stcb);
7645                         send_lock_up = 1;
7646                 }
7647                 atomic_subtract_int(&asoc->stream_queue_cnt, 1);
7648                 TAILQ_REMOVE(&strq->outqueue, sp, next);
7649                 stcb->asoc.ss_functions.sctp_ss_remove_from_stream(stcb, asoc, strq, sp);
7650                 if ((strq->state == SCTP_STREAM_RESET_PENDING) &&
7651                     (strq->chunks_on_queues == 0) &&
7652                     TAILQ_EMPTY(&strq->outqueue)) {
7653                         stcb->asoc.trigger_reset = 1;
7654                 }
7655                 if (sp->net) {
7656                         sctp_free_remote_addr(sp->net);
7657                         sp->net = NULL;
7658                 }
7659                 if (sp->data) {
7660                         sctp_m_freem(sp->data);
7661                         sp->data = NULL;
7662                 }
7663                 sctp_free_a_strmoq(stcb, sp, so_locked);
7664         }
7665         asoc->chunks_on_out_queue++;
7666         strq->chunks_on_queues++;
7667         TAILQ_INSERT_TAIL(&asoc->send_queue, chk, sctp_next);
7668         asoc->send_queue_cnt++;
7669 out_of:
7670         if (send_lock_up) {
7671                 SCTP_TCB_SEND_UNLOCK(stcb);
7672         }
7673         return (to_move);
7674 }
7675
7676 static void
7677 sctp_fill_outqueue(struct sctp_tcb *stcb, struct sctp_nets *net, int frag_point,
7678     int eeor_mode, int *quit_now, int so_locked)
7679 {
7680         struct sctp_association *asoc;
7681         struct sctp_stream_out *strq;
7682         uint32_t space_left, moved, total_moved;
7683         int bail, giveup;
7684
7685         SCTP_TCB_LOCK_ASSERT(stcb);
7686         asoc = &stcb->asoc;
7687         total_moved = 0;
7688         switch (net->ro._l_addr.sa.sa_family) {
7689 #ifdef INET
7690         case AF_INET:
7691                 space_left = net->mtu - SCTP_MIN_V4_OVERHEAD;
7692                 break;
7693 #endif
7694 #ifdef INET6
7695         case AF_INET6:
7696                 space_left = net->mtu - SCTP_MIN_OVERHEAD;
7697                 break;
7698 #endif
7699         default:
7700                 /* TSNH */
7701                 space_left = net->mtu;
7702                 break;
7703         }
7704         /* Need an allowance for the data chunk header too */
7705         space_left -= SCTP_DATA_CHUNK_OVERHEAD(stcb);
7706
7707         /* must make even word boundary */
7708         space_left &= 0xfffffffc;
7709         strq = stcb->asoc.ss_functions.sctp_ss_select_stream(stcb, net, asoc);
7710         giveup = 0;
7711         bail = 0;
7712         while ((space_left > 0) && (strq != NULL)) {
7713                 moved = sctp_move_to_outqueue(stcb, net, strq, space_left,
7714                     frag_point, &giveup, eeor_mode,
7715                     &bail, so_locked);
7716                 if ((giveup != 0) || (bail != 0)) {
7717                         break;
7718                 }
7719                 strq = stcb->asoc.ss_functions.sctp_ss_select_stream(stcb, net, asoc);
7720                 total_moved += moved;
7721                 if (space_left >= moved) {
7722                         space_left -= moved;
7723                 } else {
7724                         space_left = 0;
7725                 }
7726                 if (space_left >= SCTP_DATA_CHUNK_OVERHEAD(stcb)) {
7727                         space_left -= SCTP_DATA_CHUNK_OVERHEAD(stcb);
7728                 } else {
7729                         space_left = 0;
7730                 }
7731                 space_left &= 0xfffffffc;
7732         }
7733         if (bail != 0)
7734                 *quit_now = 1;
7735
7736         stcb->asoc.ss_functions.sctp_ss_packet_done(stcb, net, asoc);
7737
7738         if (total_moved == 0) {
7739                 if ((stcb->asoc.sctp_cmt_on_off == 0) &&
7740                     (net == stcb->asoc.primary_destination)) {
7741                         /* ran dry for primary network net */
7742                         SCTP_STAT_INCR(sctps_primary_randry);
7743                 } else if (stcb->asoc.sctp_cmt_on_off > 0) {
7744                         /* ran dry with CMT on */
7745                         SCTP_STAT_INCR(sctps_cmt_randry);
7746                 }
7747         }
7748 }
7749
7750 void
7751 sctp_fix_ecn_echo(struct sctp_association *asoc)
7752 {
7753         struct sctp_tmit_chunk *chk;
7754
7755         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
7756                 if (chk->rec.chunk_id.id == SCTP_ECN_ECHO) {
7757                         chk->sent = SCTP_DATAGRAM_UNSENT;
7758                 }
7759         }
7760 }
7761
7762 void
7763 sctp_move_chunks_from_net(struct sctp_tcb *stcb, struct sctp_nets *net)
7764 {
7765         struct sctp_association *asoc;
7766         struct sctp_tmit_chunk *chk;
7767         struct sctp_stream_queue_pending *sp;
7768         unsigned int i;
7769
7770         if (net == NULL) {
7771                 return;
7772         }
7773         asoc = &stcb->asoc;
7774         for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
7775                 TAILQ_FOREACH(sp, &stcb->asoc.strmout[i].outqueue, next) {
7776                         if (sp->net == net) {
7777                                 sctp_free_remote_addr(sp->net);
7778                                 sp->net = NULL;
7779                         }
7780                 }
7781         }
7782         TAILQ_FOREACH(chk, &asoc->send_queue, sctp_next) {
7783                 if (chk->whoTo == net) {
7784                         sctp_free_remote_addr(chk->whoTo);
7785                         chk->whoTo = NULL;
7786                 }
7787         }
7788 }
7789
7790 int
7791 sctp_med_chunk_output(struct sctp_inpcb *inp,
7792     struct sctp_tcb *stcb,
7793     struct sctp_association *asoc,
7794     int *num_out,
7795     int *reason_code,
7796     int control_only, int from_where,
7797     struct timeval *now, int *now_filled, int frag_point, int so_locked)
7798 {
7799         /**
7800          * Ok this is the generic chunk service queue. we must do the
7801          * following:
7802          * - Service the stream queue that is next, moving any
7803          *   message (note I must get a complete message i.e. FIRST/MIDDLE and
7804          *   LAST to the out queue in one pass) and assigning TSN's. This
7805          *   only applys though if the peer does not support NDATA. For NDATA
7806          *   chunks its ok to not send the entire message ;-)
7807          * - Check to see if the cwnd/rwnd allows any output, if so we go ahead and
7808          *   fomulate and send the low level chunks. Making sure to combine
7809          *   any control in the control chunk queue also.
7810          */
7811         struct sctp_nets *net, *start_at, *sack_goes_to = NULL, *old_start_at = NULL;
7812         struct mbuf *outchain, *endoutchain;
7813         struct sctp_tmit_chunk *chk, *nchk;
7814
7815         /* temp arrays for unlinking */
7816         struct sctp_tmit_chunk *data_list[SCTP_MAX_DATA_BUNDLING];
7817         int no_fragmentflg, error;
7818         unsigned int max_rwnd_per_dest, max_send_per_dest;
7819         int one_chunk, hbflag, skip_data_for_this_net;
7820         int asconf, cookie, no_out_cnt;
7821         int bundle_at, ctl_cnt, no_data_chunks, eeor_mode;
7822         unsigned int mtu, r_mtu, omtu, mx_mtu, to_out;
7823         int tsns_sent = 0;
7824         uint32_t auth_offset;
7825         struct sctp_auth_chunk *auth;
7826         uint16_t auth_keyid;
7827         int override_ok = 1;
7828         int skip_fill_up = 0;
7829         int data_auth_reqd = 0;
7830
7831         /*
7832          * JRS 5/14/07 - Add flag for whether a heartbeat is sent to the
7833          * destination.
7834          */
7835         int quit_now = 0;
7836
7837         *num_out = 0;
7838         *reason_code = 0;
7839         auth_keyid = stcb->asoc.authinfo.active_keyid;
7840         if ((asoc->state & SCTP_STATE_SHUTDOWN_PENDING) ||
7841             (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_RECEIVED) ||
7842             (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_EXPLICIT_EOR))) {
7843                 eeor_mode = 1;
7844         } else {
7845                 eeor_mode = 0;
7846         }
7847         ctl_cnt = no_out_cnt = asconf = cookie = 0;
7848         /*
7849          * First lets prime the pump. For each destination, if there is room
7850          * in the flight size, attempt to pull an MTU's worth out of the
7851          * stream queues into the general send_queue
7852          */
7853 #ifdef SCTP_AUDITING_ENABLED
7854         sctp_audit_log(0xC2, 2);
7855 #endif
7856         SCTP_TCB_LOCK_ASSERT(stcb);
7857         hbflag = 0;
7858         if (control_only)
7859                 no_data_chunks = 1;
7860         else
7861                 no_data_chunks = 0;
7862
7863         /* Nothing to possible to send? */
7864         if ((TAILQ_EMPTY(&asoc->control_send_queue) ||
7865             (asoc->ctrl_queue_cnt == stcb->asoc.ecn_echo_cnt_onq)) &&
7866             TAILQ_EMPTY(&asoc->asconf_send_queue) &&
7867             TAILQ_EMPTY(&asoc->send_queue) &&
7868             sctp_is_there_unsent_data(stcb, so_locked) == 0) {
7869 nothing_to_send:
7870                 *reason_code = 9;
7871                 return (0);
7872         }
7873         if (asoc->peers_rwnd == 0) {
7874                 /* No room in peers rwnd */
7875                 *reason_code = 1;
7876                 if (asoc->total_flight > 0) {
7877                         /* we are allowed one chunk in flight */
7878                         no_data_chunks = 1;
7879                 }
7880         }
7881         if (stcb->asoc.ecn_echo_cnt_onq) {
7882                 /* Record where a sack goes, if any */
7883                 if (no_data_chunks &&
7884                     (asoc->ctrl_queue_cnt == stcb->asoc.ecn_echo_cnt_onq)) {
7885                         /* Nothing but ECNe to send - we don't do that */
7886                         goto nothing_to_send;
7887                 }
7888                 TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
7889                         if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
7890                             (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK)) {
7891                                 sack_goes_to = chk->whoTo;
7892                                 break;
7893                         }
7894                 }
7895         }
7896         max_rwnd_per_dest = ((asoc->peers_rwnd + asoc->total_flight) / asoc->numnets);
7897         if (stcb->sctp_socket)
7898                 max_send_per_dest = SCTP_SB_LIMIT_SND(stcb->sctp_socket) / asoc->numnets;
7899         else
7900                 max_send_per_dest = 0;
7901         if (no_data_chunks == 0) {
7902                 /* How many non-directed chunks are there? */
7903                 TAILQ_FOREACH(chk, &asoc->send_queue, sctp_next) {
7904                         if (chk->whoTo == NULL) {
7905                                 /*
7906                                  * We already have non-directed chunks on
7907                                  * the queue, no need to do a fill-up.
7908                                  */
7909                                 skip_fill_up = 1;
7910                                 break;
7911                         }
7912                 }
7913         }
7914         if ((no_data_chunks == 0) &&
7915             (skip_fill_up == 0) &&
7916             (!stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc))) {
7917                 TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
7918                         /*
7919                          * This for loop we are in takes in each net, if
7920                          * its's got space in cwnd and has data sent to it
7921                          * (when CMT is off) then it calls
7922                          * sctp_fill_outqueue for the net. This gets data on
7923                          * the send queue for that network.
7924                          *
7925                          * In sctp_fill_outqueue TSN's are assigned and data
7926                          * is copied out of the stream buffers. Note mostly
7927                          * copy by reference (we hope).
7928                          */
7929                         net->window_probe = 0;
7930                         if ((net != stcb->asoc.alternate) &&
7931                             ((net->dest_state & SCTP_ADDR_PF) ||
7932                             (!(net->dest_state & SCTP_ADDR_REACHABLE)) ||
7933                             (net->dest_state & SCTP_ADDR_UNCONFIRMED))) {
7934                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
7935                                         sctp_log_cwnd(stcb, net, 1,
7936                                             SCTP_CWND_LOG_FILL_OUTQ_CALLED);
7937                                 }
7938                                 continue;
7939                         }
7940                         if ((stcb->asoc.cc_functions.sctp_cwnd_new_transmission_begins) &&
7941                             (net->flight_size == 0)) {
7942                                 (*stcb->asoc.cc_functions.sctp_cwnd_new_transmission_begins) (stcb, net);
7943                         }
7944                         if (net->flight_size >= net->cwnd) {
7945                                 /* skip this network, no room - can't fill */
7946                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
7947                                         sctp_log_cwnd(stcb, net, 3,
7948                                             SCTP_CWND_LOG_FILL_OUTQ_CALLED);
7949                                 }
7950                                 continue;
7951                         }
7952                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
7953                                 sctp_log_cwnd(stcb, net, 4, SCTP_CWND_LOG_FILL_OUTQ_CALLED);
7954                         }
7955                         sctp_fill_outqueue(stcb, net, frag_point, eeor_mode, &quit_now, so_locked);
7956                         if (quit_now) {
7957                                 /* memory alloc failure */
7958                                 no_data_chunks = 1;
7959                                 break;
7960                         }
7961                 }
7962         }
7963         /* now service each destination and send out what we can for it */
7964         /* Nothing to send? */
7965         if (TAILQ_EMPTY(&asoc->control_send_queue) &&
7966             TAILQ_EMPTY(&asoc->asconf_send_queue) &&
7967             TAILQ_EMPTY(&asoc->send_queue)) {
7968                 *reason_code = 8;
7969                 return (0);
7970         }
7971
7972         if (asoc->sctp_cmt_on_off > 0) {
7973                 /* get the last start point */
7974                 start_at = asoc->last_net_cmt_send_started;
7975                 if (start_at == NULL) {
7976                         /* null so to beginning */
7977                         start_at = TAILQ_FIRST(&asoc->nets);
7978                 } else {
7979                         start_at = TAILQ_NEXT(asoc->last_net_cmt_send_started, sctp_next);
7980                         if (start_at == NULL) {
7981                                 start_at = TAILQ_FIRST(&asoc->nets);
7982                         }
7983                 }
7984                 asoc->last_net_cmt_send_started = start_at;
7985         } else {
7986                 start_at = TAILQ_FIRST(&asoc->nets);
7987         }
7988         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
7989                 if (chk->whoTo == NULL) {
7990                         if (asoc->alternate) {
7991                                 chk->whoTo = asoc->alternate;
7992                         } else {
7993                                 chk->whoTo = asoc->primary_destination;
7994                         }
7995                         atomic_add_int(&chk->whoTo->ref_count, 1);
7996                 }
7997         }
7998         old_start_at = NULL;
7999 again_one_more_time:
8000         for (net = start_at; net != NULL; net = TAILQ_NEXT(net, sctp_next)) {
8001                 /* how much can we send? */
8002                 /* SCTPDBG("Examine for sending net:%x\n", (uint32_t)net); */
8003                 if (old_start_at && (old_start_at == net)) {
8004                         /* through list ocmpletely. */
8005                         break;
8006                 }
8007                 tsns_sent = 0xa;
8008                 if (TAILQ_EMPTY(&asoc->control_send_queue) &&
8009                     TAILQ_EMPTY(&asoc->asconf_send_queue) &&
8010                     (net->flight_size >= net->cwnd)) {
8011                         /*
8012                          * Nothing on control or asconf and flight is full,
8013                          * we can skip even in the CMT case.
8014                          */
8015                         continue;
8016                 }
8017                 bundle_at = 0;
8018                 endoutchain = outchain = NULL;
8019                 auth = NULL;
8020                 auth_offset = 0;
8021                 no_fragmentflg = 1;
8022                 one_chunk = 0;
8023                 if (net->dest_state & SCTP_ADDR_UNCONFIRMED) {
8024                         skip_data_for_this_net = 1;
8025                 } else {
8026                         skip_data_for_this_net = 0;
8027                 }
8028                 switch (((struct sockaddr *)&net->ro._l_addr)->sa_family) {
8029 #ifdef INET
8030                 case AF_INET:
8031                         mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
8032                         break;
8033 #endif
8034 #ifdef INET6
8035                 case AF_INET6:
8036                         mtu = net->mtu - SCTP_MIN_OVERHEAD;
8037                         break;
8038 #endif
8039                 default:
8040                         /* TSNH */
8041                         mtu = net->mtu;
8042                         break;
8043                 }
8044                 mx_mtu = mtu;
8045                 to_out = 0;
8046                 if (mtu > asoc->peers_rwnd) {
8047                         if (asoc->total_flight > 0) {
8048                                 /* We have a packet in flight somewhere */
8049                                 r_mtu = asoc->peers_rwnd;
8050                         } else {
8051                                 /* We are always allowed to send one MTU out */
8052                                 one_chunk = 1;
8053                                 r_mtu = mtu;
8054                         }
8055                 } else {
8056                         r_mtu = mtu;
8057                 }
8058                 error = 0;
8059                 /************************/
8060                 /* ASCONF transmission */
8061                 /************************/
8062                 /* Now first lets go through the asconf queue */
8063                 TAILQ_FOREACH_SAFE(chk, &asoc->asconf_send_queue, sctp_next, nchk) {
8064                         if (chk->rec.chunk_id.id != SCTP_ASCONF) {
8065                                 continue;
8066                         }
8067                         if (chk->whoTo == NULL) {
8068                                 if (asoc->alternate == NULL) {
8069                                         if (asoc->primary_destination != net) {
8070                                                 break;
8071                                         }
8072                                 } else {
8073                                         if (asoc->alternate != net) {
8074                                                 break;
8075                                         }
8076                                 }
8077                         } else {
8078                                 if (chk->whoTo != net) {
8079                                         break;
8080                                 }
8081                         }
8082                         if (chk->data == NULL) {
8083                                 break;
8084                         }
8085                         if (chk->sent != SCTP_DATAGRAM_UNSENT &&
8086                             chk->sent != SCTP_DATAGRAM_RESEND) {
8087                                 break;
8088                         }
8089                         /*
8090                          * if no AUTH is yet included and this chunk
8091                          * requires it, make sure to account for it.  We
8092                          * don't apply the size until the AUTH chunk is
8093                          * actually added below in case there is no room for
8094                          * this chunk. NOTE: we overload the use of "omtu"
8095                          * here
8096                          */
8097                         if ((auth == NULL) &&
8098                             sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
8099                             stcb->asoc.peer_auth_chunks)) {
8100                                 omtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
8101                         } else
8102                                 omtu = 0;
8103                         /* Here we do NOT factor the r_mtu */
8104                         if ((chk->send_size < (int)(mtu - omtu)) ||
8105                             (chk->flags & CHUNK_FLAGS_FRAGMENT_OK)) {
8106                                 /*
8107                                  * We probably should glom the mbuf chain
8108                                  * from the chk->data for control but the
8109                                  * problem is it becomes yet one more level
8110                                  * of tracking to do if for some reason
8111                                  * output fails. Then I have got to
8112                                  * reconstruct the merged control chain.. el
8113                                  * yucko.. for now we take the easy way and
8114                                  * do the copy
8115                                  */
8116                                 /*
8117                                  * Add an AUTH chunk, if chunk requires it
8118                                  * save the offset into the chain for AUTH
8119                                  */
8120                                 if ((auth == NULL) &&
8121                                     (sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
8122                                     stcb->asoc.peer_auth_chunks))) {
8123                                         outchain = sctp_add_auth_chunk(outchain,
8124                                             &endoutchain,
8125                                             &auth,
8126                                             &auth_offset,
8127                                             stcb,
8128                                             chk->rec.chunk_id.id);
8129                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8130                                 }
8131                                 outchain = sctp_copy_mbufchain(chk->data, outchain, &endoutchain,
8132                                     (int)chk->rec.chunk_id.can_take_data,
8133                                     chk->send_size, chk->copy_by_ref);
8134                                 if (outchain == NULL) {
8135                                         *reason_code = 8;
8136                                         SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
8137                                         return (ENOMEM);
8138                                 }
8139                                 SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8140                                 /* update our MTU size */
8141                                 if (mtu > (chk->send_size + omtu))
8142                                         mtu -= (chk->send_size + omtu);
8143                                 else
8144                                         mtu = 0;
8145                                 to_out += (chk->send_size + omtu);
8146                                 /* Do clear IP_DF ? */
8147                                 if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
8148                                         no_fragmentflg = 0;
8149                                 }
8150                                 if (chk->rec.chunk_id.can_take_data)
8151                                         chk->data = NULL;
8152                                 /*
8153                                  * set hb flag since we can use these for
8154                                  * RTO
8155                                  */
8156                                 hbflag = 1;
8157                                 asconf = 1;
8158                                 /*
8159                                  * should sysctl this: don't bundle data
8160                                  * with ASCONF since it requires AUTH
8161                                  */
8162                                 no_data_chunks = 1;
8163                                 chk->sent = SCTP_DATAGRAM_SENT;
8164                                 if (chk->whoTo == NULL) {
8165                                         chk->whoTo = net;
8166                                         atomic_add_int(&net->ref_count, 1);
8167                                 }
8168                                 chk->snd_count++;
8169                                 if (mtu == 0) {
8170                                         /*
8171                                          * Ok we are out of room but we can
8172                                          * output without effecting the
8173                                          * flight size since this little guy
8174                                          * is a control only packet.
8175                                          */
8176                                         sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp, stcb, net);
8177                                         /*
8178                                          * do NOT clear the asconf flag as
8179                                          * it is used to do appropriate
8180                                          * source address selection.
8181                                          */
8182                                         if (*now_filled == 0) {
8183                                                 (void)SCTP_GETTIME_TIMEVAL(now);
8184                                                 *now_filled = 1;
8185                                         }
8186                                         net->last_sent_time = *now;
8187                                         hbflag = 0;
8188                                         if ((error = sctp_lowlevel_chunk_output(inp, stcb, net,
8189                                             (struct sockaddr *)&net->ro._l_addr,
8190                                             outchain, auth_offset, auth,
8191                                             stcb->asoc.authinfo.active_keyid,
8192                                             no_fragmentflg, 0, asconf,
8193                                             inp->sctp_lport, stcb->rport,
8194                                             htonl(stcb->asoc.peer_vtag),
8195                                             net->port, NULL,
8196                                             0, 0,
8197                                             so_locked))) {
8198                                                 /*
8199                                                  * error, we could not
8200                                                  * output
8201                                                  */
8202                                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
8203                                                 if (from_where == 0) {
8204                                                         SCTP_STAT_INCR(sctps_lowlevelerrusr);
8205                                                 }
8206                                                 if (error == ENOBUFS) {
8207                                                         asoc->ifp_had_enobuf = 1;
8208                                                         SCTP_STAT_INCR(sctps_lowlevelerr);
8209                                                 }
8210                                                 /* error, could not output */
8211                                                 if (error == EHOSTUNREACH) {
8212                                                         /*
8213                                                          * Destination went
8214                                                          * unreachable
8215                                                          * during this send
8216                                                          */
8217                                                         sctp_move_chunks_from_net(stcb, net);
8218                                                 }
8219                                                 *reason_code = 7;
8220                                                 break;
8221                                         } else {
8222                                                 asoc->ifp_had_enobuf = 0;
8223                                         }
8224                                         /*
8225                                          * increase the number we sent, if a
8226                                          * cookie is sent we don't tell them
8227                                          * any was sent out.
8228                                          */
8229                                         outchain = endoutchain = NULL;
8230                                         auth = NULL;
8231                                         auth_offset = 0;
8232                                         if (!no_out_cnt)
8233                                                 *num_out += ctl_cnt;
8234                                         /* recalc a clean slate and setup */
8235                                         switch (net->ro._l_addr.sa.sa_family) {
8236 #ifdef INET
8237                                         case AF_INET:
8238                                                 mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
8239                                                 break;
8240 #endif
8241 #ifdef INET6
8242                                         case AF_INET6:
8243                                                 mtu = net->mtu - SCTP_MIN_OVERHEAD;
8244                                                 break;
8245 #endif
8246                                         default:
8247                                                 /* TSNH */
8248                                                 mtu = net->mtu;
8249                                                 break;
8250                                         }
8251                                         to_out = 0;
8252                                         no_fragmentflg = 1;
8253                                 }
8254                         }
8255                 }
8256                 if (error != 0) {
8257                         /* try next net */
8258                         continue;
8259                 }
8260                 /************************/
8261                 /* Control transmission */
8262                 /************************/
8263                 /* Now first lets go through the control queue */
8264                 TAILQ_FOREACH_SAFE(chk, &asoc->control_send_queue, sctp_next, nchk) {
8265                         if ((sack_goes_to) &&
8266                             (chk->rec.chunk_id.id == SCTP_ECN_ECHO) &&
8267                             (chk->whoTo != sack_goes_to)) {
8268                                 /*
8269                                  * if we have a sack in queue, and we are
8270                                  * looking at an ecn echo that is NOT queued
8271                                  * to where the sack is going..
8272                                  */
8273                                 if (chk->whoTo == net) {
8274                                         /*
8275                                          * Don't transmit it to where its
8276                                          * going (current net)
8277                                          */
8278                                         continue;
8279                                 } else if (sack_goes_to == net) {
8280                                         /*
8281                                          * But do transmit it to this
8282                                          * address
8283                                          */
8284                                         goto skip_net_check;
8285                                 }
8286                         }
8287                         if (chk->whoTo == NULL) {
8288                                 if (asoc->alternate == NULL) {
8289                                         if (asoc->primary_destination != net) {
8290                                                 continue;
8291                                         }
8292                                 } else {
8293                                         if (asoc->alternate != net) {
8294                                                 continue;
8295                                         }
8296                                 }
8297                         } else {
8298                                 if (chk->whoTo != net) {
8299                                         continue;
8300                                 }
8301                         }
8302         skip_net_check:
8303                         if (chk->data == NULL) {
8304                                 continue;
8305                         }
8306                         if (chk->sent != SCTP_DATAGRAM_UNSENT) {
8307                                 /*
8308                                  * It must be unsent. Cookies and ASCONF's
8309                                  * hang around but there timers will force
8310                                  * when marked for resend.
8311                                  */
8312                                 continue;
8313                         }
8314                         /*
8315                          * if no AUTH is yet included and this chunk
8316                          * requires it, make sure to account for it.  We
8317                          * don't apply the size until the AUTH chunk is
8318                          * actually added below in case there is no room for
8319                          * this chunk. NOTE: we overload the use of "omtu"
8320                          * here
8321                          */
8322                         if ((auth == NULL) &&
8323                             sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
8324                             stcb->asoc.peer_auth_chunks)) {
8325                                 omtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
8326                         } else
8327                                 omtu = 0;
8328                         /* Here we do NOT factor the r_mtu */
8329                         if ((chk->send_size <= (int)(mtu - omtu)) ||
8330                             (chk->flags & CHUNK_FLAGS_FRAGMENT_OK)) {
8331                                 /*
8332                                  * We probably should glom the mbuf chain
8333                                  * from the chk->data for control but the
8334                                  * problem is it becomes yet one more level
8335                                  * of tracking to do if for some reason
8336                                  * output fails. Then I have got to
8337                                  * reconstruct the merged control chain.. el
8338                                  * yucko.. for now we take the easy way and
8339                                  * do the copy
8340                                  */
8341                                 /*
8342                                  * Add an AUTH chunk, if chunk requires it
8343                                  * save the offset into the chain for AUTH
8344                                  */
8345                                 if ((auth == NULL) &&
8346                                     (sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
8347                                     stcb->asoc.peer_auth_chunks))) {
8348                                         outchain = sctp_add_auth_chunk(outchain,
8349                                             &endoutchain,
8350                                             &auth,
8351                                             &auth_offset,
8352                                             stcb,
8353                                             chk->rec.chunk_id.id);
8354                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8355                                 }
8356                                 outchain = sctp_copy_mbufchain(chk->data, outchain, &endoutchain,
8357                                     (int)chk->rec.chunk_id.can_take_data,
8358                                     chk->send_size, chk->copy_by_ref);
8359                                 if (outchain == NULL) {
8360                                         *reason_code = 8;
8361                                         SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
8362                                         return (ENOMEM);
8363                                 }
8364                                 SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8365                                 /* update our MTU size */
8366                                 if (mtu > (chk->send_size + omtu))
8367                                         mtu -= (chk->send_size + omtu);
8368                                 else
8369                                         mtu = 0;
8370                                 to_out += (chk->send_size + omtu);
8371                                 /* Do clear IP_DF ? */
8372                                 if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
8373                                         no_fragmentflg = 0;
8374                                 }
8375                                 if (chk->rec.chunk_id.can_take_data)
8376                                         chk->data = NULL;
8377                                 /* Mark things to be removed, if needed */
8378                                 if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
8379                                     (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK) ||  /* EY */
8380                                     (chk->rec.chunk_id.id == SCTP_HEARTBEAT_REQUEST) ||
8381                                     (chk->rec.chunk_id.id == SCTP_HEARTBEAT_ACK) ||
8382                                     (chk->rec.chunk_id.id == SCTP_SHUTDOWN) ||
8383                                     (chk->rec.chunk_id.id == SCTP_SHUTDOWN_ACK) ||
8384                                     (chk->rec.chunk_id.id == SCTP_OPERATION_ERROR) ||
8385                                     (chk->rec.chunk_id.id == SCTP_COOKIE_ACK) ||
8386                                     (chk->rec.chunk_id.id == SCTP_ECN_CWR) ||
8387                                     (chk->rec.chunk_id.id == SCTP_PACKET_DROPPED) ||
8388                                     (chk->rec.chunk_id.id == SCTP_ASCONF_ACK)) {
8389                                         if (chk->rec.chunk_id.id == SCTP_HEARTBEAT_REQUEST) {
8390                                                 hbflag = 1;
8391                                         }
8392                                         /* remove these chunks at the end */
8393                                         if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
8394                                             (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK)) {
8395                                                 /* turn off the timer */
8396                                                 if (SCTP_OS_TIMER_PENDING(&stcb->asoc.dack_timer.timer)) {
8397                                                         sctp_timer_stop(SCTP_TIMER_TYPE_RECV,
8398                                                             inp, stcb, NULL,
8399                                                             SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_1);
8400                                                 }
8401                                         }
8402                                         ctl_cnt++;
8403                                 } else {
8404                                         /*
8405                                          * Other chunks, since they have
8406                                          * timers running (i.e. COOKIE) we
8407                                          * just "trust" that it gets sent or
8408                                          * retransmitted.
8409                                          */
8410                                         ctl_cnt++;
8411                                         if (chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
8412                                                 cookie = 1;
8413                                                 no_out_cnt = 1;
8414                                         } else if (chk->rec.chunk_id.id == SCTP_ECN_ECHO) {
8415                                                 /*
8416                                                  * Increment ecne send count
8417                                                  * here this means we may be
8418                                                  * over-zealous in our
8419                                                  * counting if the send
8420                                                  * fails, but its the best
8421                                                  * place to do it (we used
8422                                                  * to do it in the queue of
8423                                                  * the chunk, but that did
8424                                                  * not tell how many times
8425                                                  * it was sent.
8426                                                  */
8427                                                 SCTP_STAT_INCR(sctps_sendecne);
8428                                         }
8429                                         chk->sent = SCTP_DATAGRAM_SENT;
8430                                         if (chk->whoTo == NULL) {
8431                                                 chk->whoTo = net;
8432                                                 atomic_add_int(&net->ref_count, 1);
8433                                         }
8434                                         chk->snd_count++;
8435                                 }
8436                                 if (mtu == 0) {
8437                                         /*
8438                                          * Ok we are out of room but we can
8439                                          * output without effecting the
8440                                          * flight size since this little guy
8441                                          * is a control only packet.
8442                                          */
8443                                         if (asconf) {
8444                                                 sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp, stcb, net);
8445                                                 /*
8446                                                  * do NOT clear the asconf
8447                                                  * flag as it is used to do
8448                                                  * appropriate source
8449                                                  * address selection.
8450                                                  */
8451                                         }
8452                                         if (cookie) {
8453                                                 sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, inp, stcb, net);
8454                                                 cookie = 0;
8455                                         }
8456                                         /* Only HB or ASCONF advances time */
8457                                         if (hbflag) {
8458                                                 if (*now_filled == 0) {
8459                                                         (void)SCTP_GETTIME_TIMEVAL(now);
8460                                                         *now_filled = 1;
8461                                                 }
8462                                                 net->last_sent_time = *now;
8463                                                 hbflag = 0;
8464                                         }
8465                                         if ((error = sctp_lowlevel_chunk_output(inp, stcb, net,
8466                                             (struct sockaddr *)&net->ro._l_addr,
8467                                             outchain,
8468                                             auth_offset, auth,
8469                                             stcb->asoc.authinfo.active_keyid,
8470                                             no_fragmentflg, 0, asconf,
8471                                             inp->sctp_lport, stcb->rport,
8472                                             htonl(stcb->asoc.peer_vtag),
8473                                             net->port, NULL,
8474                                             0, 0,
8475                                             so_locked))) {
8476                                                 /*
8477                                                  * error, we could not
8478                                                  * output
8479                                                  */
8480                                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
8481                                                 if (from_where == 0) {
8482                                                         SCTP_STAT_INCR(sctps_lowlevelerrusr);
8483                                                 }
8484                                                 if (error == ENOBUFS) {
8485                                                         asoc->ifp_had_enobuf = 1;
8486                                                         SCTP_STAT_INCR(sctps_lowlevelerr);
8487                                                 }
8488                                                 if (error == EHOSTUNREACH) {
8489                                                         /*
8490                                                          * Destination went
8491                                                          * unreachable
8492                                                          * during this send
8493                                                          */
8494                                                         sctp_move_chunks_from_net(stcb, net);
8495                                                 }
8496                                                 *reason_code = 7;
8497                                                 break;
8498                                         } else {
8499                                                 asoc->ifp_had_enobuf = 0;
8500                                         }
8501                                         /*
8502                                          * increase the number we sent, if a
8503                                          * cookie is sent we don't tell them
8504                                          * any was sent out.
8505                                          */
8506                                         outchain = endoutchain = NULL;
8507                                         auth = NULL;
8508                                         auth_offset = 0;
8509                                         if (!no_out_cnt)
8510                                                 *num_out += ctl_cnt;
8511                                         /* recalc a clean slate and setup */
8512                                         switch (net->ro._l_addr.sa.sa_family) {
8513 #ifdef INET
8514                                         case AF_INET:
8515                                                 mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
8516                                                 break;
8517 #endif
8518 #ifdef INET6
8519                                         case AF_INET6:
8520                                                 mtu = net->mtu - SCTP_MIN_OVERHEAD;
8521                                                 break;
8522 #endif
8523                                         default:
8524                                                 /* TSNH */
8525                                                 mtu = net->mtu;
8526                                                 break;
8527                                         }
8528                                         to_out = 0;
8529                                         no_fragmentflg = 1;
8530                                 }
8531                         }
8532                 }
8533                 if (error != 0) {
8534                         /* try next net */
8535                         continue;
8536                 }
8537                 /* JRI: if dest is in PF state, do not send data to it */
8538                 if ((asoc->sctp_cmt_on_off > 0) &&
8539                     (net != stcb->asoc.alternate) &&
8540                     (net->dest_state & SCTP_ADDR_PF)) {
8541                         goto no_data_fill;
8542                 }
8543                 if (net->flight_size >= net->cwnd) {
8544                         goto no_data_fill;
8545                 }
8546                 if ((asoc->sctp_cmt_on_off > 0) &&
8547                     (SCTP_BASE_SYSCTL(sctp_buffer_splitting) & SCTP_RECV_BUFFER_SPLITTING) &&
8548                     (net->flight_size > max_rwnd_per_dest)) {
8549                         goto no_data_fill;
8550                 }
8551                 /*
8552                  * We need a specific accounting for the usage of the send
8553                  * buffer. We also need to check the number of messages per
8554                  * net. For now, this is better than nothing and it disabled
8555                  * by default...
8556                  */
8557                 if ((asoc->sctp_cmt_on_off > 0) &&
8558                     (SCTP_BASE_SYSCTL(sctp_buffer_splitting) & SCTP_SEND_BUFFER_SPLITTING) &&
8559                     (max_send_per_dest > 0) &&
8560                     (net->flight_size > max_send_per_dest)) {
8561                         goto no_data_fill;
8562                 }
8563                 /*********************/
8564                 /* Data transmission */
8565                 /*********************/
8566                 /*
8567                  * if AUTH for DATA is required and no AUTH has been added
8568                  * yet, account for this in the mtu now... if no data can be
8569                  * bundled, this adjustment won't matter anyways since the
8570                  * packet will be going out...
8571                  */
8572                 data_auth_reqd = sctp_auth_is_required_chunk(SCTP_DATA,
8573                     stcb->asoc.peer_auth_chunks);
8574                 if (data_auth_reqd && (auth == NULL)) {
8575                         mtu -= sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
8576                 }
8577                 /* now lets add any data within the MTU constraints */
8578                 switch (((struct sockaddr *)&net->ro._l_addr)->sa_family) {
8579 #ifdef INET
8580                 case AF_INET:
8581                         if (net->mtu > SCTP_MIN_V4_OVERHEAD)
8582                                 omtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
8583                         else
8584                                 omtu = 0;
8585                         break;
8586 #endif
8587 #ifdef INET6
8588                 case AF_INET6:
8589                         if (net->mtu > SCTP_MIN_OVERHEAD)
8590                                 omtu = net->mtu - SCTP_MIN_OVERHEAD;
8591                         else
8592                                 omtu = 0;
8593                         break;
8594 #endif
8595                 default:
8596                         /* TSNH */
8597                         omtu = 0;
8598                         break;
8599                 }
8600                 if ((((SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) ||
8601                     (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_RECEIVED)) &&
8602                     (skip_data_for_this_net == 0)) ||
8603                     (cookie)) {
8604                         TAILQ_FOREACH_SAFE(chk, &asoc->send_queue, sctp_next, nchk) {
8605                                 if (no_data_chunks) {
8606                                         /* let only control go out */
8607                                         *reason_code = 1;
8608                                         break;
8609                                 }
8610                                 if (net->flight_size >= net->cwnd) {
8611                                         /* skip this net, no room for data */
8612                                         *reason_code = 2;
8613                                         break;
8614                                 }
8615                                 if ((chk->whoTo != NULL) &&
8616                                     (chk->whoTo != net)) {
8617                                         /* Don't send the chunk on this net */
8618                                         continue;
8619                                 }
8620
8621                                 if (asoc->sctp_cmt_on_off == 0) {
8622                                         if ((asoc->alternate) &&
8623                                             (asoc->alternate != net) &&
8624                                             (chk->whoTo == NULL)) {
8625                                                 continue;
8626                                         } else if ((net != asoc->primary_destination) &&
8627                                                     (asoc->alternate == NULL) &&
8628                                             (chk->whoTo == NULL)) {
8629                                                 continue;
8630                                         }
8631                                 }
8632                                 if ((chk->send_size > omtu) && ((chk->flags & CHUNK_FLAGS_FRAGMENT_OK) == 0)) {
8633                                         /*-
8634                                          * strange, we have a chunk that is
8635                                          * to big for its destination and
8636                                          * yet no fragment ok flag.
8637                                          * Something went wrong when the
8638                                          * PMTU changed...we did not mark
8639                                          * this chunk for some reason?? I
8640                                          * will fix it here by letting IP
8641                                          * fragment it for now and printing
8642                                          * a warning. This really should not
8643                                          * happen ...
8644                                          */
8645                                         SCTP_PRINTF("Warning chunk of %d bytes > mtu:%d and yet PMTU disc missed\n",
8646                                             chk->send_size, mtu);
8647                                         chk->flags |= CHUNK_FLAGS_FRAGMENT_OK;
8648                                 }
8649                                 if (SCTP_BASE_SYSCTL(sctp_enable_sack_immediately) &&
8650                                     (asoc->state & SCTP_STATE_SHUTDOWN_PENDING)) {
8651                                         struct sctp_data_chunk *dchkh;
8652
8653                                         dchkh = mtod(chk->data, struct sctp_data_chunk *);
8654                                         dchkh->ch.chunk_flags |= SCTP_DATA_SACK_IMMEDIATELY;
8655                                 }
8656                                 if (((chk->send_size <= mtu) && (chk->send_size <= r_mtu)) ||
8657                                     ((chk->flags & CHUNK_FLAGS_FRAGMENT_OK) && (chk->send_size <= asoc->peers_rwnd))) {
8658                                         /* ok we will add this one */
8659
8660                                         /*
8661                                          * Add an AUTH chunk, if chunk
8662                                          * requires it, save the offset into
8663                                          * the chain for AUTH
8664                                          */
8665                                         if (data_auth_reqd) {
8666                                                 if (auth == NULL) {
8667                                                         outchain = sctp_add_auth_chunk(outchain,
8668                                                             &endoutchain,
8669                                                             &auth,
8670                                                             &auth_offset,
8671                                                             stcb,
8672                                                             SCTP_DATA);
8673                                                         auth_keyid = chk->auth_keyid;
8674                                                         override_ok = 0;
8675                                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8676                                                 } else if (override_ok) {
8677                                                         /*
8678                                                          * use this data's
8679                                                          * keyid
8680                                                          */
8681                                                         auth_keyid = chk->auth_keyid;
8682                                                         override_ok = 0;
8683                                                 } else if (auth_keyid != chk->auth_keyid) {
8684                                                         /*
8685                                                          * different keyid,
8686                                                          * so done bundling
8687                                                          */
8688                                                         break;
8689                                                 }
8690                                         }
8691                                         outchain = sctp_copy_mbufchain(chk->data, outchain, &endoutchain, 0,
8692                                             chk->send_size, chk->copy_by_ref);
8693                                         if (outchain == NULL) {
8694                                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "No memory?\n");
8695                                                 if (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
8696                                                         sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
8697                                                 }
8698                                                 *reason_code = 3;
8699                                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
8700                                                 return (ENOMEM);
8701                                         }
8702                                         /* upate our MTU size */
8703                                         /* Do clear IP_DF ? */
8704                                         if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
8705                                                 no_fragmentflg = 0;
8706                                         }
8707                                         /* unsigned subtraction of mtu */
8708                                         if (mtu > chk->send_size)
8709                                                 mtu -= chk->send_size;
8710                                         else
8711                                                 mtu = 0;
8712                                         /* unsigned subtraction of r_mtu */
8713                                         if (r_mtu > chk->send_size)
8714                                                 r_mtu -= chk->send_size;
8715                                         else
8716                                                 r_mtu = 0;
8717
8718                                         to_out += chk->send_size;
8719                                         if ((to_out > mx_mtu) && no_fragmentflg) {
8720 #ifdef INVARIANTS
8721                                                 panic("Exceeding mtu of %d out size is %d", mx_mtu, to_out);
8722 #else
8723                                                 SCTP_PRINTF("Exceeding mtu of %d out size is %d\n",
8724                                                     mx_mtu, to_out);
8725 #endif
8726                                         }
8727                                         chk->window_probe = 0;
8728                                         data_list[bundle_at++] = chk;
8729                                         if (bundle_at >= SCTP_MAX_DATA_BUNDLING) {
8730                                                 break;
8731                                         }
8732                                         if (chk->sent == SCTP_DATAGRAM_UNSENT) {
8733                                                 if ((chk->rec.data.rcv_flags & SCTP_DATA_UNORDERED) == 0) {
8734                                                         SCTP_STAT_INCR_COUNTER64(sctps_outorderchunks);
8735                                                 } else {
8736                                                         SCTP_STAT_INCR_COUNTER64(sctps_outunorderchunks);
8737                                                 }
8738                                                 if (((chk->rec.data.rcv_flags & SCTP_DATA_LAST_FRAG) == SCTP_DATA_LAST_FRAG) &&
8739                                                     ((chk->rec.data.rcv_flags & SCTP_DATA_FIRST_FRAG) == 0))
8740                                                         /*
8741                                                          * Count number of
8742                                                          * user msg's that
8743                                                          * were fragmented
8744                                                          * we do this by
8745                                                          * counting when we
8746                                                          * see a LAST
8747                                                          * fragment only.
8748                                                          */
8749                                                         SCTP_STAT_INCR_COUNTER64(sctps_fragusrmsgs);
8750                                         }
8751                                         if ((mtu == 0) || (r_mtu == 0) || (one_chunk)) {
8752                                                 if ((one_chunk) && (stcb->asoc.total_flight == 0)) {
8753                                                         data_list[0]->window_probe = 1;
8754                                                         net->window_probe = 1;
8755                                                 }
8756                                                 break;
8757                                         }
8758                                 } else {
8759                                         /*
8760                                          * Must be sent in order of the
8761                                          * TSN's (on a network)
8762                                          */
8763                                         break;
8764                                 }
8765                         }       /* for (chunk gather loop for this net) */
8766                 }               /* if asoc.state OPEN */
8767 no_data_fill:
8768                 /* Is there something to send for this destination? */
8769                 if (outchain) {
8770                         /* We may need to start a control timer or two */
8771                         if (asconf) {
8772                                 sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp,
8773                                     stcb, net);
8774                                 /*
8775                                  * do NOT clear the asconf flag as it is
8776                                  * used to do appropriate source address
8777                                  * selection.
8778                                  */
8779                         }
8780                         if (cookie) {
8781                                 sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, inp, stcb, net);
8782                                 cookie = 0;
8783                         }
8784                         /* must start a send timer if data is being sent */
8785                         if (bundle_at && (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer))) {
8786                                 /*
8787                                  * no timer running on this destination
8788                                  * restart it.
8789                                  */
8790                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
8791                         }
8792                         if (bundle_at || hbflag) {
8793                                 /* For data/asconf and hb set time */
8794                                 if (*now_filled == 0) {
8795                                         (void)SCTP_GETTIME_TIMEVAL(now);
8796                                         *now_filled = 1;
8797                                 }
8798                                 net->last_sent_time = *now;
8799                         }
8800                         /* Now send it, if there is anything to send :> */
8801                         if ((error = sctp_lowlevel_chunk_output(inp,
8802                             stcb,
8803                             net,
8804                             (struct sockaddr *)&net->ro._l_addr,
8805                             outchain,
8806                             auth_offset,
8807                             auth,
8808                             auth_keyid,
8809                             no_fragmentflg,
8810                             bundle_at,
8811                             asconf,
8812                             inp->sctp_lport, stcb->rport,
8813                             htonl(stcb->asoc.peer_vtag),
8814                             net->port, NULL,
8815                             0, 0,
8816                             so_locked))) {
8817                                 /* error, we could not output */
8818                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
8819                                 if (from_where == 0) {
8820                                         SCTP_STAT_INCR(sctps_lowlevelerrusr);
8821                                 }
8822                                 if (error == ENOBUFS) {
8823                                         asoc->ifp_had_enobuf = 1;
8824                                         SCTP_STAT_INCR(sctps_lowlevelerr);
8825                                 }
8826                                 if (error == EHOSTUNREACH) {
8827                                         /*
8828                                          * Destination went unreachable
8829                                          * during this send
8830                                          */
8831                                         sctp_move_chunks_from_net(stcb, net);
8832                                 }
8833                                 *reason_code = 6;
8834                                 /*-
8835                                  * I add this line to be paranoid. As far as
8836                                  * I can tell the continue, takes us back to
8837                                  * the top of the for, but just to make sure
8838                                  * I will reset these again here.
8839                                  */
8840                                 ctl_cnt = 0;
8841                                 continue;       /* This takes us back to the
8842                                                  * for() for the nets. */
8843                         } else {
8844                                 asoc->ifp_had_enobuf = 0;
8845                         }
8846                         endoutchain = NULL;
8847                         auth = NULL;
8848                         auth_offset = 0;
8849                         if (!no_out_cnt) {
8850                                 *num_out += (ctl_cnt + bundle_at);
8851                         }
8852                         if (bundle_at) {
8853                                 /* setup for a RTO measurement */
8854                                 tsns_sent = data_list[0]->rec.data.tsn;
8855                                 /* fill time if not already filled */
8856                                 if (*now_filled == 0) {
8857                                         (void)SCTP_GETTIME_TIMEVAL(&asoc->time_last_sent);
8858                                         *now_filled = 1;
8859                                         *now = asoc->time_last_sent;
8860                                 } else {
8861                                         asoc->time_last_sent = *now;
8862                                 }
8863                                 if (net->rto_needed) {
8864                                         data_list[0]->do_rtt = 1;
8865                                         net->rto_needed = 0;
8866                                 }
8867                                 SCTP_STAT_INCR_BY(sctps_senddata, bundle_at);
8868                                 sctp_clean_up_datalist(stcb, asoc, data_list, bundle_at, net);
8869                         }
8870                         if (one_chunk) {
8871                                 break;
8872                         }
8873                 }
8874                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
8875                         sctp_log_cwnd(stcb, net, tsns_sent, SCTP_CWND_LOG_FROM_SEND);
8876                 }
8877         }
8878         if (old_start_at == NULL) {
8879                 old_start_at = start_at;
8880                 start_at = TAILQ_FIRST(&asoc->nets);
8881                 if (old_start_at)
8882                         goto again_one_more_time;
8883         }
8884
8885         /*
8886          * At the end there should be no NON timed chunks hanging on this
8887          * queue.
8888          */
8889         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
8890                 sctp_log_cwnd(stcb, net, *num_out, SCTP_CWND_LOG_FROM_SEND);
8891         }
8892         if ((*num_out == 0) && (*reason_code == 0)) {
8893                 *reason_code = 4;
8894         } else {
8895                 *reason_code = 5;
8896         }
8897         sctp_clean_up_ctl(stcb, asoc, so_locked);
8898         return (0);
8899 }
8900
8901 void
8902 sctp_queue_op_err(struct sctp_tcb *stcb, struct mbuf *op_err)
8903 {
8904         /*-
8905          * Prepend a OPERATIONAL_ERROR chunk header and put on the end of
8906          * the control chunk queue.
8907          */
8908         struct sctp_chunkhdr *hdr;
8909         struct sctp_tmit_chunk *chk;
8910         struct mbuf *mat, *last_mbuf;
8911         uint32_t chunk_length;
8912         uint16_t padding_length;
8913
8914         SCTP_TCB_LOCK_ASSERT(stcb);
8915         SCTP_BUF_PREPEND(op_err, sizeof(struct sctp_chunkhdr), M_NOWAIT);
8916         if (op_err == NULL) {
8917                 return;
8918         }
8919         last_mbuf = NULL;
8920         chunk_length = 0;
8921         for (mat = op_err; mat != NULL; mat = SCTP_BUF_NEXT(mat)) {
8922                 chunk_length += SCTP_BUF_LEN(mat);
8923                 if (SCTP_BUF_NEXT(mat) == NULL) {
8924                         last_mbuf = mat;
8925                 }
8926         }
8927         if (chunk_length > SCTP_MAX_CHUNK_LENGTH) {
8928                 sctp_m_freem(op_err);
8929                 return;
8930         }
8931         padding_length = chunk_length % 4;
8932         if (padding_length != 0) {
8933                 padding_length = 4 - padding_length;
8934         }
8935         if (padding_length != 0) {
8936                 if (sctp_add_pad_tombuf(last_mbuf, padding_length) == NULL) {
8937                         sctp_m_freem(op_err);
8938                         return;
8939                 }
8940         }
8941         sctp_alloc_a_chunk(stcb, chk);
8942         if (chk == NULL) {
8943                 /* no memory */
8944                 sctp_m_freem(op_err);
8945                 return;
8946         }
8947         chk->copy_by_ref = 0;
8948         chk->rec.chunk_id.id = SCTP_OPERATION_ERROR;
8949         chk->rec.chunk_id.can_take_data = 0;
8950         chk->flags = 0;
8951         chk->send_size = (uint16_t)chunk_length;
8952         chk->sent = SCTP_DATAGRAM_UNSENT;
8953         chk->snd_count = 0;
8954         chk->asoc = &stcb->asoc;
8955         chk->data = op_err;
8956         chk->whoTo = NULL;
8957         hdr = mtod(op_err, struct sctp_chunkhdr *);
8958         hdr->chunk_type = SCTP_OPERATION_ERROR;
8959         hdr->chunk_flags = 0;
8960         hdr->chunk_length = htons(chk->send_size);
8961         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
8962         chk->asoc->ctrl_queue_cnt++;
8963 }
8964
8965 int
8966 sctp_send_cookie_echo(struct mbuf *m,
8967     int offset, int limit,
8968     struct sctp_tcb *stcb,
8969     struct sctp_nets *net)
8970 {
8971         /*-
8972          * pull out the cookie and put it at the front of the control chunk
8973          * queue.
8974          */
8975         int at;
8976         struct mbuf *cookie;
8977         struct sctp_paramhdr param, *phdr;
8978         struct sctp_chunkhdr *hdr;
8979         struct sctp_tmit_chunk *chk;
8980         uint16_t ptype, plen;
8981
8982         SCTP_TCB_LOCK_ASSERT(stcb);
8983         /* First find the cookie in the param area */
8984         cookie = NULL;
8985         at = offset + sizeof(struct sctp_init_chunk);
8986         for (;;) {
8987                 phdr = sctp_get_next_param(m, at, &param, sizeof(param));
8988                 if (phdr == NULL) {
8989                         return (-3);
8990                 }
8991                 ptype = ntohs(phdr->param_type);
8992                 plen = ntohs(phdr->param_length);
8993                 if (plen < sizeof(struct sctp_paramhdr)) {
8994                         return (-6);
8995                 }
8996                 if (ptype == SCTP_STATE_COOKIE) {
8997                         int pad;
8998
8999                         /* found the cookie */
9000                         if (at + plen > limit) {
9001                                 return (-7);
9002                         }
9003                         cookie = SCTP_M_COPYM(m, at, plen, M_NOWAIT);
9004                         if (cookie == NULL) {
9005                                 /* No memory */
9006                                 return (-2);
9007                         }
9008                         if ((pad = (plen % 4)) > 0) {
9009                                 pad = 4 - pad;
9010                         }
9011                         if (pad > 0) {
9012                                 if (sctp_pad_lastmbuf(cookie, pad, NULL) == NULL) {
9013                                         return (-8);
9014                                 }
9015                         }
9016 #ifdef SCTP_MBUF_LOGGING
9017                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
9018                                 sctp_log_mbc(cookie, SCTP_MBUF_ICOPY);
9019                         }
9020 #endif
9021                         break;
9022                 }
9023                 at += SCTP_SIZE32(plen);
9024         }
9025         /* ok, we got the cookie lets change it into a cookie echo chunk */
9026         /* first the change from param to cookie */
9027         hdr = mtod(cookie, struct sctp_chunkhdr *);
9028         hdr->chunk_type = SCTP_COOKIE_ECHO;
9029         hdr->chunk_flags = 0;
9030         /* get the chunk stuff now and place it in the FRONT of the queue */
9031         sctp_alloc_a_chunk(stcb, chk);
9032         if (chk == NULL) {
9033                 /* no memory */
9034                 sctp_m_freem(cookie);
9035                 return (-5);
9036         }
9037         chk->copy_by_ref = 0;
9038         chk->rec.chunk_id.id = SCTP_COOKIE_ECHO;
9039         chk->rec.chunk_id.can_take_data = 0;
9040         chk->flags = CHUNK_FLAGS_FRAGMENT_OK;
9041         chk->send_size = SCTP_SIZE32(plen);
9042         chk->sent = SCTP_DATAGRAM_UNSENT;
9043         chk->snd_count = 0;
9044         chk->asoc = &stcb->asoc;
9045         chk->data = cookie;
9046         chk->whoTo = net;
9047         atomic_add_int(&chk->whoTo->ref_count, 1);
9048         TAILQ_INSERT_HEAD(&chk->asoc->control_send_queue, chk, sctp_next);
9049         chk->asoc->ctrl_queue_cnt++;
9050         return (0);
9051 }
9052
9053 void
9054 sctp_send_heartbeat_ack(struct sctp_tcb *stcb,
9055     struct mbuf *m,
9056     int offset,
9057     int chk_length,
9058     struct sctp_nets *net)
9059 {
9060         /*
9061          * take a HB request and make it into a HB ack and send it.
9062          */
9063         struct mbuf *outchain;
9064         struct sctp_chunkhdr *chdr;
9065         struct sctp_tmit_chunk *chk;
9066
9067         if (net == NULL)
9068                 /* must have a net pointer */
9069                 return;
9070
9071         outchain = SCTP_M_COPYM(m, offset, chk_length, M_NOWAIT);
9072         if (outchain == NULL) {
9073                 /* gak out of memory */
9074                 return;
9075         }
9076 #ifdef SCTP_MBUF_LOGGING
9077         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
9078                 sctp_log_mbc(outchain, SCTP_MBUF_ICOPY);
9079         }
9080 #endif
9081         chdr = mtod(outchain, struct sctp_chunkhdr *);
9082         chdr->chunk_type = SCTP_HEARTBEAT_ACK;
9083         chdr->chunk_flags = 0;
9084         if (chk_length % 4 != 0) {
9085                 sctp_pad_lastmbuf(outchain, 4 - (chk_length % 4), NULL);
9086         }
9087         sctp_alloc_a_chunk(stcb, chk);
9088         if (chk == NULL) {
9089                 /* no memory */
9090                 sctp_m_freem(outchain);
9091                 return;
9092         }
9093         chk->copy_by_ref = 0;
9094         chk->rec.chunk_id.id = SCTP_HEARTBEAT_ACK;
9095         chk->rec.chunk_id.can_take_data = 1;
9096         chk->flags = 0;
9097         chk->send_size = chk_length;
9098         chk->sent = SCTP_DATAGRAM_UNSENT;
9099         chk->snd_count = 0;
9100         chk->asoc = &stcb->asoc;
9101         chk->data = outchain;
9102         chk->whoTo = net;
9103         atomic_add_int(&chk->whoTo->ref_count, 1);
9104         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9105         chk->asoc->ctrl_queue_cnt++;
9106 }
9107
9108 void
9109 sctp_send_cookie_ack(struct sctp_tcb *stcb)
9110 {
9111         /* formulate and queue a cookie-ack back to sender */
9112         struct mbuf *cookie_ack;
9113         struct sctp_chunkhdr *hdr;
9114         struct sctp_tmit_chunk *chk;
9115
9116         SCTP_TCB_LOCK_ASSERT(stcb);
9117
9118         cookie_ack = sctp_get_mbuf_for_msg(sizeof(struct sctp_chunkhdr), 0, M_NOWAIT, 1, MT_HEADER);
9119         if (cookie_ack == NULL) {
9120                 /* no mbuf's */
9121                 return;
9122         }
9123         SCTP_BUF_RESV_UF(cookie_ack, SCTP_MIN_OVERHEAD);
9124         sctp_alloc_a_chunk(stcb, chk);
9125         if (chk == NULL) {
9126                 /* no memory */
9127                 sctp_m_freem(cookie_ack);
9128                 return;
9129         }
9130         chk->copy_by_ref = 0;
9131         chk->rec.chunk_id.id = SCTP_COOKIE_ACK;
9132         chk->rec.chunk_id.can_take_data = 1;
9133         chk->flags = 0;
9134         chk->send_size = sizeof(struct sctp_chunkhdr);
9135         chk->sent = SCTP_DATAGRAM_UNSENT;
9136         chk->snd_count = 0;
9137         chk->asoc = &stcb->asoc;
9138         chk->data = cookie_ack;
9139         if (chk->asoc->last_control_chunk_from != NULL) {
9140                 chk->whoTo = chk->asoc->last_control_chunk_from;
9141                 atomic_add_int(&chk->whoTo->ref_count, 1);
9142         } else {
9143                 chk->whoTo = NULL;
9144         }
9145         hdr = mtod(cookie_ack, struct sctp_chunkhdr *);
9146         hdr->chunk_type = SCTP_COOKIE_ACK;
9147         hdr->chunk_flags = 0;
9148         hdr->chunk_length = htons(chk->send_size);
9149         SCTP_BUF_LEN(cookie_ack) = chk->send_size;
9150         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9151         chk->asoc->ctrl_queue_cnt++;
9152         return;
9153 }
9154
9155 void
9156 sctp_send_shutdown_ack(struct sctp_tcb *stcb, struct sctp_nets *net)
9157 {
9158         /* formulate and queue a SHUTDOWN-ACK back to the sender */
9159         struct mbuf *m_shutdown_ack;
9160         struct sctp_shutdown_ack_chunk *ack_cp;
9161         struct sctp_tmit_chunk *chk;
9162
9163         m_shutdown_ack = sctp_get_mbuf_for_msg(sizeof(struct sctp_shutdown_ack_chunk), 0, M_NOWAIT, 1, MT_HEADER);
9164         if (m_shutdown_ack == NULL) {
9165                 /* no mbuf's */
9166                 return;
9167         }
9168         SCTP_BUF_RESV_UF(m_shutdown_ack, SCTP_MIN_OVERHEAD);
9169         sctp_alloc_a_chunk(stcb, chk);
9170         if (chk == NULL) {
9171                 /* no memory */
9172                 sctp_m_freem(m_shutdown_ack);
9173                 return;
9174         }
9175         chk->copy_by_ref = 0;
9176         chk->rec.chunk_id.id = SCTP_SHUTDOWN_ACK;
9177         chk->rec.chunk_id.can_take_data = 1;
9178         chk->flags = 0;
9179         chk->send_size = sizeof(struct sctp_chunkhdr);
9180         chk->sent = SCTP_DATAGRAM_UNSENT;
9181         chk->snd_count = 0;
9182         chk->asoc = &stcb->asoc;
9183         chk->data = m_shutdown_ack;
9184         chk->whoTo = net;
9185         if (chk->whoTo) {
9186                 atomic_add_int(&chk->whoTo->ref_count, 1);
9187         }
9188         ack_cp = mtod(m_shutdown_ack, struct sctp_shutdown_ack_chunk *);
9189         ack_cp->ch.chunk_type = SCTP_SHUTDOWN_ACK;
9190         ack_cp->ch.chunk_flags = 0;
9191         ack_cp->ch.chunk_length = htons(chk->send_size);
9192         SCTP_BUF_LEN(m_shutdown_ack) = chk->send_size;
9193         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9194         chk->asoc->ctrl_queue_cnt++;
9195         return;
9196 }
9197
9198 void
9199 sctp_send_shutdown(struct sctp_tcb *stcb, struct sctp_nets *net)
9200 {
9201         /* formulate and queue a SHUTDOWN to the sender */
9202         struct mbuf *m_shutdown;
9203         struct sctp_shutdown_chunk *shutdown_cp;
9204         struct sctp_tmit_chunk *chk;
9205
9206         TAILQ_FOREACH(chk, &stcb->asoc.control_send_queue, sctp_next) {
9207                 if (chk->rec.chunk_id.id == SCTP_SHUTDOWN) {
9208                         /* We already have a SHUTDOWN queued. Reuse it. */
9209                         if (chk->whoTo) {
9210                                 sctp_free_remote_addr(chk->whoTo);
9211                                 chk->whoTo = NULL;
9212                         }
9213                         break;
9214                 }
9215         }
9216         if (chk == NULL) {
9217                 m_shutdown = sctp_get_mbuf_for_msg(sizeof(struct sctp_shutdown_chunk), 0, M_NOWAIT, 1, MT_HEADER);
9218                 if (m_shutdown == NULL) {
9219                         /* no mbuf's */
9220                         return;
9221                 }
9222                 SCTP_BUF_RESV_UF(m_shutdown, SCTP_MIN_OVERHEAD);
9223                 sctp_alloc_a_chunk(stcb, chk);
9224                 if (chk == NULL) {
9225                         /* no memory */
9226                         sctp_m_freem(m_shutdown);
9227                         return;
9228                 }
9229                 chk->copy_by_ref = 0;
9230                 chk->rec.chunk_id.id = SCTP_SHUTDOWN;
9231                 chk->rec.chunk_id.can_take_data = 1;
9232                 chk->flags = 0;
9233                 chk->send_size = sizeof(struct sctp_shutdown_chunk);
9234                 chk->sent = SCTP_DATAGRAM_UNSENT;
9235                 chk->snd_count = 0;
9236                 chk->asoc = &stcb->asoc;
9237                 chk->data = m_shutdown;
9238                 chk->whoTo = net;
9239                 if (chk->whoTo) {
9240                         atomic_add_int(&chk->whoTo->ref_count, 1);
9241                 }
9242                 shutdown_cp = mtod(m_shutdown, struct sctp_shutdown_chunk *);
9243                 shutdown_cp->ch.chunk_type = SCTP_SHUTDOWN;
9244                 shutdown_cp->ch.chunk_flags = 0;
9245                 shutdown_cp->ch.chunk_length = htons(chk->send_size);
9246                 shutdown_cp->cumulative_tsn_ack = htonl(stcb->asoc.cumulative_tsn);
9247                 SCTP_BUF_LEN(m_shutdown) = chk->send_size;
9248                 TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9249                 chk->asoc->ctrl_queue_cnt++;
9250         } else {
9251                 TAILQ_REMOVE(&stcb->asoc.control_send_queue, chk, sctp_next);
9252                 chk->whoTo = net;
9253                 if (chk->whoTo) {
9254                         atomic_add_int(&chk->whoTo->ref_count, 1);
9255                 }
9256                 shutdown_cp = mtod(chk->data, struct sctp_shutdown_chunk *);
9257                 shutdown_cp->cumulative_tsn_ack = htonl(stcb->asoc.cumulative_tsn);
9258                 TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
9259         }
9260         return;
9261 }
9262
9263 void
9264 sctp_send_asconf(struct sctp_tcb *stcb, struct sctp_nets *net, int addr_locked)
9265 {
9266         /*
9267          * formulate and queue an ASCONF to the peer. ASCONF parameters
9268          * should be queued on the assoc queue.
9269          */
9270         struct sctp_tmit_chunk *chk;
9271         struct mbuf *m_asconf;
9272         int len;
9273
9274         SCTP_TCB_LOCK_ASSERT(stcb);
9275
9276         if ((!TAILQ_EMPTY(&stcb->asoc.asconf_send_queue)) &&
9277             (!sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_MULTIPLE_ASCONFS))) {
9278                 /* can't send a new one if there is one in flight already */
9279                 return;
9280         }
9281
9282         /* compose an ASCONF chunk, maximum length is PMTU */
9283         m_asconf = sctp_compose_asconf(stcb, &len, addr_locked);
9284         if (m_asconf == NULL) {
9285                 return;
9286         }
9287
9288         sctp_alloc_a_chunk(stcb, chk);
9289         if (chk == NULL) {
9290                 /* no memory */
9291                 sctp_m_freem(m_asconf);
9292                 return;
9293         }
9294
9295         chk->copy_by_ref = 0;
9296         chk->rec.chunk_id.id = SCTP_ASCONF;
9297         chk->rec.chunk_id.can_take_data = 0;
9298         chk->flags = CHUNK_FLAGS_FRAGMENT_OK;
9299         chk->data = m_asconf;
9300         chk->send_size = len;
9301         chk->sent = SCTP_DATAGRAM_UNSENT;
9302         chk->snd_count = 0;
9303         chk->asoc = &stcb->asoc;
9304         chk->whoTo = net;
9305         if (chk->whoTo) {
9306                 atomic_add_int(&chk->whoTo->ref_count, 1);
9307         }
9308         TAILQ_INSERT_TAIL(&chk->asoc->asconf_send_queue, chk, sctp_next);
9309         chk->asoc->ctrl_queue_cnt++;
9310         return;
9311 }
9312
9313 void
9314 sctp_send_asconf_ack(struct sctp_tcb *stcb)
9315 {
9316         /*
9317          * formulate and queue a asconf-ack back to sender. the asconf-ack
9318          * must be stored in the tcb.
9319          */
9320         struct sctp_tmit_chunk *chk;
9321         struct sctp_asconf_ack *ack, *latest_ack;
9322         struct mbuf *m_ack;
9323         struct sctp_nets *net = NULL;
9324
9325         SCTP_TCB_LOCK_ASSERT(stcb);
9326         /* Get the latest ASCONF-ACK */
9327         latest_ack = TAILQ_LAST(&stcb->asoc.asconf_ack_sent, sctp_asconf_ackhead);
9328         if (latest_ack == NULL) {
9329                 return;
9330         }
9331         if (latest_ack->last_sent_to != NULL &&
9332             latest_ack->last_sent_to == stcb->asoc.last_control_chunk_from) {
9333                 /* we're doing a retransmission */
9334                 net = sctp_find_alternate_net(stcb, stcb->asoc.last_control_chunk_from, 0);
9335                 if (net == NULL) {
9336                         /* no alternate */
9337                         if (stcb->asoc.last_control_chunk_from == NULL) {
9338                                 if (stcb->asoc.alternate) {
9339                                         net = stcb->asoc.alternate;
9340                                 } else {
9341                                         net = stcb->asoc.primary_destination;
9342                                 }
9343                         } else {
9344                                 net = stcb->asoc.last_control_chunk_from;
9345                         }
9346                 }
9347         } else {
9348                 /* normal case */
9349                 if (stcb->asoc.last_control_chunk_from == NULL) {
9350                         if (stcb->asoc.alternate) {
9351                                 net = stcb->asoc.alternate;
9352                         } else {
9353                                 net = stcb->asoc.primary_destination;
9354                         }
9355                 } else {
9356                         net = stcb->asoc.last_control_chunk_from;
9357                 }
9358         }
9359         latest_ack->last_sent_to = net;
9360
9361         TAILQ_FOREACH(ack, &stcb->asoc.asconf_ack_sent, next) {
9362                 if (ack->data == NULL) {
9363                         continue;
9364                 }
9365
9366                 /* copy the asconf_ack */
9367                 m_ack = SCTP_M_COPYM(ack->data, 0, M_COPYALL, M_NOWAIT);
9368                 if (m_ack == NULL) {
9369                         /* couldn't copy it */
9370                         return;
9371                 }
9372 #ifdef SCTP_MBUF_LOGGING
9373                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
9374                         sctp_log_mbc(m_ack, SCTP_MBUF_ICOPY);
9375                 }
9376 #endif
9377
9378                 sctp_alloc_a_chunk(stcb, chk);
9379                 if (chk == NULL) {
9380                         /* no memory */
9381                         if (m_ack)
9382                                 sctp_m_freem(m_ack);
9383                         return;
9384                 }
9385                 chk->copy_by_ref = 0;
9386                 chk->rec.chunk_id.id = SCTP_ASCONF_ACK;
9387                 chk->rec.chunk_id.can_take_data = 1;
9388                 chk->flags = CHUNK_FLAGS_FRAGMENT_OK;
9389                 chk->whoTo = net;
9390                 if (chk->whoTo) {
9391                         atomic_add_int(&chk->whoTo->ref_count, 1);
9392                 }
9393                 chk->data = m_ack;
9394                 chk->send_size = ack->len;
9395                 chk->sent = SCTP_DATAGRAM_UNSENT;
9396                 chk->snd_count = 0;
9397                 chk->asoc = &stcb->asoc;
9398
9399                 TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9400                 chk->asoc->ctrl_queue_cnt++;
9401         }
9402         return;
9403 }
9404
9405 static int
9406 sctp_chunk_retransmission(struct sctp_inpcb *inp,
9407     struct sctp_tcb *stcb,
9408     struct sctp_association *asoc,
9409     int *cnt_out, struct timeval *now, int *now_filled, int *fr_done, int so_locked)
9410 {
9411         /*-
9412          * send out one MTU of retransmission. If fast_retransmit is
9413          * happening we ignore the cwnd. Otherwise we obey the cwnd and
9414          * rwnd. For a Cookie or Asconf in the control chunk queue we
9415          * retransmit them by themselves.
9416          *
9417          * For data chunks we will pick out the lowest TSN's in the sent_queue
9418          * marked for resend and bundle them all together (up to a MTU of
9419          * destination). The address to send to should have been
9420          * selected/changed where the retransmission was marked (i.e. in FR
9421          * or t3-timeout routines).
9422          */
9423         struct sctp_tmit_chunk *data_list[SCTP_MAX_DATA_BUNDLING];
9424         struct sctp_tmit_chunk *chk, *fwd;
9425         struct mbuf *m, *endofchain;
9426         struct sctp_nets *net = NULL;
9427         uint32_t tsns_sent = 0;
9428         int no_fragmentflg, bundle_at, cnt_thru;
9429         unsigned int mtu;
9430         int error, i, one_chunk, fwd_tsn, ctl_cnt, tmr_started;
9431         struct sctp_auth_chunk *auth = NULL;
9432         uint32_t auth_offset = 0;
9433         uint16_t auth_keyid;
9434         int override_ok = 1;
9435         int data_auth_reqd = 0;
9436         uint32_t dmtu = 0;
9437
9438         SCTP_TCB_LOCK_ASSERT(stcb);
9439         tmr_started = ctl_cnt = 0;
9440         no_fragmentflg = 1;
9441         fwd_tsn = 0;
9442         *cnt_out = 0;
9443         fwd = NULL;
9444         endofchain = m = NULL;
9445         auth_keyid = stcb->asoc.authinfo.active_keyid;
9446 #ifdef SCTP_AUDITING_ENABLED
9447         sctp_audit_log(0xC3, 1);
9448 #endif
9449         if ((TAILQ_EMPTY(&asoc->sent_queue)) &&
9450             (TAILQ_EMPTY(&asoc->control_send_queue))) {
9451                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "SCTP hits empty queue with cnt set to %d?\n",
9452                     asoc->sent_queue_retran_cnt);
9453                 asoc->sent_queue_cnt = 0;
9454                 asoc->sent_queue_cnt_removeable = 0;
9455                 /* send back 0/0 so we enter normal transmission */
9456                 *cnt_out = 0;
9457                 return (0);
9458         }
9459         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
9460                 if ((chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) ||
9461                     (chk->rec.chunk_id.id == SCTP_STREAM_RESET) ||
9462                     (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN)) {
9463                         if (chk->sent != SCTP_DATAGRAM_RESEND) {
9464                                 continue;
9465                         }
9466                         if (chk->rec.chunk_id.id == SCTP_STREAM_RESET) {
9467                                 if (chk != asoc->str_reset) {
9468                                         /*
9469                                          * not eligible for retran if its
9470                                          * not ours
9471                                          */
9472                                         continue;
9473                                 }
9474                         }
9475                         ctl_cnt++;
9476                         if (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN) {
9477                                 fwd_tsn = 1;
9478                         }
9479                         /*
9480                          * Add an AUTH chunk, if chunk requires it save the
9481                          * offset into the chain for AUTH
9482                          */
9483                         if ((auth == NULL) &&
9484                             (sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
9485                             stcb->asoc.peer_auth_chunks))) {
9486                                 m = sctp_add_auth_chunk(m, &endofchain,
9487                                     &auth, &auth_offset,
9488                                     stcb,
9489                                     chk->rec.chunk_id.id);
9490                                 SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
9491                         }
9492                         m = sctp_copy_mbufchain(chk->data, m, &endofchain, 0, chk->send_size, chk->copy_by_ref);
9493                         break;
9494                 }
9495         }
9496         one_chunk = 0;
9497         cnt_thru = 0;
9498         /* do we have control chunks to retransmit? */
9499         if (m != NULL) {
9500                 /* Start a timer no matter if we succeed or fail */
9501                 if (chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
9502                         sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, inp, stcb, chk->whoTo);
9503                 } else if (chk->rec.chunk_id.id == SCTP_ASCONF)
9504                         sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp, stcb, chk->whoTo);
9505                 chk->snd_count++;       /* update our count */
9506                 if ((error = sctp_lowlevel_chunk_output(inp, stcb, chk->whoTo,
9507                     (struct sockaddr *)&chk->whoTo->ro._l_addr, m,
9508                     auth_offset, auth, stcb->asoc.authinfo.active_keyid,
9509                     no_fragmentflg, 0, 0,
9510                     inp->sctp_lport, stcb->rport, htonl(stcb->asoc.peer_vtag),
9511                     chk->whoTo->port, NULL,
9512                     0, 0,
9513                     so_locked))) {
9514                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
9515                         if (error == ENOBUFS) {
9516                                 asoc->ifp_had_enobuf = 1;
9517                                 SCTP_STAT_INCR(sctps_lowlevelerr);
9518                         }
9519                         return (error);
9520                 } else {
9521                         asoc->ifp_had_enobuf = 0;
9522                 }
9523                 endofchain = NULL;
9524                 auth = NULL;
9525                 auth_offset = 0;
9526                 /*
9527                  * We don't want to mark the net->sent time here since this
9528                  * we use this for HB and retrans cannot measure RTT
9529                  */
9530                 /* (void)SCTP_GETTIME_TIMEVAL(&chk->whoTo->last_sent_time); */
9531                 *cnt_out += 1;
9532                 chk->sent = SCTP_DATAGRAM_SENT;
9533                 sctp_ucount_decr(stcb->asoc.sent_queue_retran_cnt);
9534                 if (fwd_tsn == 0) {
9535                         return (0);
9536                 } else {
9537                         /* Clean up the fwd-tsn list */
9538                         sctp_clean_up_ctl(stcb, asoc, so_locked);
9539                         return (0);
9540                 }
9541         }
9542         /*
9543          * Ok, it is just data retransmission we need to do or that and a
9544          * fwd-tsn with it all.
9545          */
9546         if (TAILQ_EMPTY(&asoc->sent_queue)) {
9547                 return (SCTP_RETRAN_DONE);
9548         }
9549         if ((SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED) ||
9550             (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_WAIT)) {
9551                 /* not yet open, resend the cookie and that is it */
9552                 return (1);
9553         }
9554 #ifdef SCTP_AUDITING_ENABLED
9555         sctp_auditing(20, inp, stcb, NULL);
9556 #endif
9557         data_auth_reqd = sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks);
9558         TAILQ_FOREACH(chk, &asoc->sent_queue, sctp_next) {
9559                 if (chk->sent != SCTP_DATAGRAM_RESEND) {
9560                         /* No, not sent to this net or not ready for rtx */
9561                         continue;
9562                 }
9563                 if (chk->data == NULL) {
9564                         SCTP_PRINTF("TSN:%x chk->snd_count:%d chk->sent:%d can't retran - no data\n",
9565                             chk->rec.data.tsn, chk->snd_count, chk->sent);
9566                         continue;
9567                 }
9568                 if ((SCTP_BASE_SYSCTL(sctp_max_retran_chunk)) &&
9569                     (chk->snd_count >= SCTP_BASE_SYSCTL(sctp_max_retran_chunk))) {
9570                         struct mbuf *op_err;
9571                         char msg[SCTP_DIAG_INFO_LEN];
9572
9573                         SCTP_SNPRINTF(msg, sizeof(msg), "TSN %8.8x retransmitted %d times, giving up",
9574                             chk->rec.data.tsn, chk->snd_count);
9575                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
9576                             msg);
9577                         atomic_add_int(&stcb->asoc.refcnt, 1);
9578                         sctp_abort_an_association(stcb->sctp_ep, stcb, op_err,
9579                             false, so_locked);
9580                         SCTP_TCB_LOCK(stcb);
9581                         atomic_subtract_int(&stcb->asoc.refcnt, 1);
9582                         return (SCTP_RETRAN_EXIT);
9583                 }
9584                 /* pick up the net */
9585                 net = chk->whoTo;
9586                 switch (net->ro._l_addr.sa.sa_family) {
9587 #ifdef INET
9588                 case AF_INET:
9589                         mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
9590                         break;
9591 #endif
9592 #ifdef INET6
9593                 case AF_INET6:
9594                         mtu = net->mtu - SCTP_MIN_OVERHEAD;
9595                         break;
9596 #endif
9597                 default:
9598                         /* TSNH */
9599                         mtu = net->mtu;
9600                         break;
9601                 }
9602
9603                 if ((asoc->peers_rwnd < mtu) && (asoc->total_flight > 0)) {
9604                         /* No room in peers rwnd */
9605                         uint32_t tsn;
9606
9607                         tsn = asoc->last_acked_seq + 1;
9608                         if (tsn == chk->rec.data.tsn) {
9609                                 /*
9610                                  * we make a special exception for this
9611                                  * case. The peer has no rwnd but is missing
9612                                  * the lowest chunk.. which is probably what
9613                                  * is holding up the rwnd.
9614                                  */
9615                                 goto one_chunk_around;
9616                         }
9617                         return (1);
9618                 }
9619 one_chunk_around:
9620                 if (asoc->peers_rwnd < mtu) {
9621                         one_chunk = 1;
9622                         if ((asoc->peers_rwnd == 0) &&
9623                             (asoc->total_flight == 0)) {
9624                                 chk->window_probe = 1;
9625                                 chk->whoTo->window_probe = 1;
9626                         }
9627                 }
9628 #ifdef SCTP_AUDITING_ENABLED
9629                 sctp_audit_log(0xC3, 2);
9630 #endif
9631                 bundle_at = 0;
9632                 m = NULL;
9633                 net->fast_retran_ip = 0;
9634                 if (chk->rec.data.doing_fast_retransmit == 0) {
9635                         /*
9636                          * if no FR in progress skip destination that have
9637                          * flight_size > cwnd.
9638                          */
9639                         if (net->flight_size >= net->cwnd) {
9640                                 continue;
9641                         }
9642                 } else {
9643                         /*
9644                          * Mark the destination net to have FR recovery
9645                          * limits put on it.
9646                          */
9647                         *fr_done = 1;
9648                         net->fast_retran_ip = 1;
9649                 }
9650
9651                 /*
9652                  * if no AUTH is yet included and this chunk requires it,
9653                  * make sure to account for it.  We don't apply the size
9654                  * until the AUTH chunk is actually added below in case
9655                  * there is no room for this chunk.
9656                  */
9657                 if (data_auth_reqd && (auth == NULL)) {
9658                         dmtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
9659                 } else
9660                         dmtu = 0;
9661
9662                 if ((chk->send_size <= (mtu - dmtu)) ||
9663                     (chk->flags & CHUNK_FLAGS_FRAGMENT_OK)) {
9664                         /* ok we will add this one */
9665                         if (data_auth_reqd) {
9666                                 if (auth == NULL) {
9667                                         m = sctp_add_auth_chunk(m,
9668                                             &endofchain,
9669                                             &auth,
9670                                             &auth_offset,
9671                                             stcb,
9672                                             SCTP_DATA);
9673                                         auth_keyid = chk->auth_keyid;
9674                                         override_ok = 0;
9675                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
9676                                 } else if (override_ok) {
9677                                         auth_keyid = chk->auth_keyid;
9678                                         override_ok = 0;
9679                                 } else if (chk->auth_keyid != auth_keyid) {
9680                                         /* different keyid, so done bundling */
9681                                         break;
9682                                 }
9683                         }
9684                         m = sctp_copy_mbufchain(chk->data, m, &endofchain, 0, chk->send_size, chk->copy_by_ref);
9685                         if (m == NULL) {
9686                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
9687                                 return (ENOMEM);
9688                         }
9689                         /* Do clear IP_DF ? */
9690                         if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
9691                                 no_fragmentflg = 0;
9692                         }
9693                         /* upate our MTU size */
9694                         if (mtu > (chk->send_size + dmtu))
9695                                 mtu -= (chk->send_size + dmtu);
9696                         else
9697                                 mtu = 0;
9698                         data_list[bundle_at++] = chk;
9699                         if (one_chunk && (asoc->total_flight <= 0)) {
9700                                 SCTP_STAT_INCR(sctps_windowprobed);
9701                         }
9702                 }
9703                 if (one_chunk == 0) {
9704                         /*
9705                          * now are there anymore forward from chk to pick
9706                          * up?
9707                          */
9708                         for (fwd = TAILQ_NEXT(chk, sctp_next); fwd != NULL; fwd = TAILQ_NEXT(fwd, sctp_next)) {
9709                                 if (fwd->sent != SCTP_DATAGRAM_RESEND) {
9710                                         /* Nope, not for retran */
9711                                         continue;
9712                                 }
9713                                 if (fwd->whoTo != net) {
9714                                         /* Nope, not the net in question */
9715                                         continue;
9716                                 }
9717                                 if (data_auth_reqd && (auth == NULL)) {
9718                                         dmtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
9719                                 } else
9720                                         dmtu = 0;
9721                                 if (fwd->send_size <= (mtu - dmtu)) {
9722                                         if (data_auth_reqd) {
9723                                                 if (auth == NULL) {
9724                                                         m = sctp_add_auth_chunk(m,
9725                                                             &endofchain,
9726                                                             &auth,
9727                                                             &auth_offset,
9728                                                             stcb,
9729                                                             SCTP_DATA);
9730                                                         auth_keyid = fwd->auth_keyid;
9731                                                         override_ok = 0;
9732                                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
9733                                                 } else if (override_ok) {
9734                                                         auth_keyid = fwd->auth_keyid;
9735                                                         override_ok = 0;
9736                                                 } else if (fwd->auth_keyid != auth_keyid) {
9737                                                         /*
9738                                                          * different keyid,
9739                                                          * so done bundling
9740                                                          */
9741                                                         break;
9742                                                 }
9743                                         }
9744                                         m = sctp_copy_mbufchain(fwd->data, m, &endofchain, 0, fwd->send_size, fwd->copy_by_ref);
9745                                         if (m == NULL) {
9746                                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
9747                                                 return (ENOMEM);
9748                                         }
9749                                         /* Do clear IP_DF ? */
9750                                         if (fwd->flags & CHUNK_FLAGS_FRAGMENT_OK) {
9751                                                 no_fragmentflg = 0;
9752                                         }
9753                                         /* upate our MTU size */
9754                                         if (mtu > (fwd->send_size + dmtu))
9755                                                 mtu -= (fwd->send_size + dmtu);
9756                                         else
9757                                                 mtu = 0;
9758                                         data_list[bundle_at++] = fwd;
9759                                         if (bundle_at >= SCTP_MAX_DATA_BUNDLING) {
9760                                                 break;
9761                                         }
9762                                 } else {
9763                                         /* can't fit so we are done */
9764                                         break;
9765                                 }
9766                         }
9767                 }
9768                 /* Is there something to send for this destination? */
9769                 if (m) {
9770                         /*
9771                          * No matter if we fail/or succeed we should start a
9772                          * timer. A failure is like a lost IP packet :-)
9773                          */
9774                         if (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
9775                                 /*
9776                                  * no timer running on this destination
9777                                  * restart it.
9778                                  */
9779                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
9780                                 tmr_started = 1;
9781                         }
9782                         /* Now lets send it, if there is anything to send :> */
9783                         if ((error = sctp_lowlevel_chunk_output(inp, stcb, net,
9784                             (struct sockaddr *)&net->ro._l_addr, m,
9785                             auth_offset, auth, auth_keyid,
9786                             no_fragmentflg, 0, 0,
9787                             inp->sctp_lport, stcb->rport, htonl(stcb->asoc.peer_vtag),
9788                             net->port, NULL,
9789                             0, 0,
9790                             so_locked))) {
9791                                 /* error, we could not output */
9792                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
9793                                 if (error == ENOBUFS) {
9794                                         asoc->ifp_had_enobuf = 1;
9795                                         SCTP_STAT_INCR(sctps_lowlevelerr);
9796                                 }
9797                                 return (error);
9798                         } else {
9799                                 asoc->ifp_had_enobuf = 0;
9800                         }
9801                         endofchain = NULL;
9802                         auth = NULL;
9803                         auth_offset = 0;
9804                         /* For HB's */
9805                         /*
9806                          * We don't want to mark the net->sent time here
9807                          * since this we use this for HB and retrans cannot
9808                          * measure RTT
9809                          */
9810                         /* (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time); */
9811
9812                         /* For auto-close */
9813                         cnt_thru++;
9814                         if (*now_filled == 0) {
9815                                 (void)SCTP_GETTIME_TIMEVAL(&asoc->time_last_sent);
9816                                 *now = asoc->time_last_sent;
9817                                 *now_filled = 1;
9818                         } else {
9819                                 asoc->time_last_sent = *now;
9820                         }
9821                         *cnt_out += bundle_at;
9822 #ifdef SCTP_AUDITING_ENABLED
9823                         sctp_audit_log(0xC4, bundle_at);
9824 #endif
9825                         if (bundle_at) {
9826                                 tsns_sent = data_list[0]->rec.data.tsn;
9827                         }
9828                         for (i = 0; i < bundle_at; i++) {
9829                                 SCTP_STAT_INCR(sctps_sendretransdata);
9830                                 data_list[i]->sent = SCTP_DATAGRAM_SENT;
9831                                 /*
9832                                  * When we have a revoked data, and we
9833                                  * retransmit it, then we clear the revoked
9834                                  * flag since this flag dictates if we
9835                                  * subtracted from the fs
9836                                  */
9837                                 if (data_list[i]->rec.data.chunk_was_revoked) {
9838                                         /* Deflate the cwnd */
9839                                         data_list[i]->whoTo->cwnd -= data_list[i]->book_size;
9840                                         data_list[i]->rec.data.chunk_was_revoked = 0;
9841                                 }
9842                                 data_list[i]->snd_count++;
9843                                 sctp_ucount_decr(asoc->sent_queue_retran_cnt);
9844                                 /* record the time */
9845                                 data_list[i]->sent_rcv_time = asoc->time_last_sent;
9846                                 if (data_list[i]->book_size_scale) {
9847                                         /*
9848                                          * need to double the book size on
9849                                          * this one
9850                                          */
9851                                         data_list[i]->book_size_scale = 0;
9852                                         /*
9853                                          * Since we double the booksize, we
9854                                          * must also double the output queue
9855                                          * size, since this get shrunk when
9856                                          * we free by this amount.
9857                                          */
9858                                         atomic_add_int(&((asoc)->total_output_queue_size), data_list[i]->book_size);
9859                                         data_list[i]->book_size *= 2;
9860                                 } else {
9861                                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_RWND_ENABLE) {
9862                                                 sctp_log_rwnd(SCTP_DECREASE_PEER_RWND,
9863                                                     asoc->peers_rwnd, data_list[i]->send_size, SCTP_BASE_SYSCTL(sctp_peer_chunk_oh));
9864                                         }
9865                                         asoc->peers_rwnd = sctp_sbspace_sub(asoc->peers_rwnd,
9866                                             (uint32_t)(data_list[i]->send_size +
9867                                             SCTP_BASE_SYSCTL(sctp_peer_chunk_oh)));
9868                                 }
9869                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
9870                                         sctp_misc_ints(SCTP_FLIGHT_LOG_UP_RSND,
9871                                             data_list[i]->whoTo->flight_size,
9872                                             data_list[i]->book_size,
9873                                             (uint32_t)(uintptr_t)data_list[i]->whoTo,
9874                                             data_list[i]->rec.data.tsn);
9875                                 }
9876                                 sctp_flight_size_increase(data_list[i]);
9877                                 sctp_total_flight_increase(stcb, data_list[i]);
9878                                 if (asoc->peers_rwnd < stcb->sctp_ep->sctp_ep.sctp_sws_sender) {
9879                                         /* SWS sender side engages */
9880                                         asoc->peers_rwnd = 0;
9881                                 }
9882                                 if ((i == 0) &&
9883                                     (data_list[i]->rec.data.doing_fast_retransmit)) {
9884                                         SCTP_STAT_INCR(sctps_sendfastretrans);
9885                                         if ((data_list[i] == TAILQ_FIRST(&asoc->sent_queue)) &&
9886                                             (tmr_started == 0)) {
9887                                                 /*-
9888                                                  * ok we just fast-retrans'd
9889                                                  * the lowest TSN, i.e the
9890                                                  * first on the list. In
9891                                                  * this case we want to give
9892                                                  * some more time to get a
9893                                                  * SACK back without a
9894                                                  * t3-expiring.
9895                                                  */
9896                                                 sctp_timer_stop(SCTP_TIMER_TYPE_SEND, inp, stcb, net,
9897                                                     SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_2);
9898                                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
9899                                         }
9900                                 }
9901                         }
9902                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
9903                                 sctp_log_cwnd(stcb, net, tsns_sent, SCTP_CWND_LOG_FROM_RESEND);
9904                         }
9905 #ifdef SCTP_AUDITING_ENABLED
9906                         sctp_auditing(21, inp, stcb, NULL);
9907 #endif
9908                 } else {
9909                         /* None will fit */
9910                         return (1);
9911                 }
9912                 if (asoc->sent_queue_retran_cnt <= 0) {
9913                         /* all done we have no more to retran */
9914                         asoc->sent_queue_retran_cnt = 0;
9915                         break;
9916                 }
9917                 if (one_chunk) {
9918                         /* No more room in rwnd */
9919                         return (1);
9920                 }
9921                 /* stop the for loop here. we sent out a packet */
9922                 break;
9923         }
9924         return (0);
9925 }
9926
9927 static void
9928 sctp_timer_validation(struct sctp_inpcb *inp,
9929     struct sctp_tcb *stcb,
9930     struct sctp_association *asoc)
9931 {
9932         struct sctp_nets *net;
9933
9934         /* Validate that a timer is running somewhere */
9935         TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
9936                 if (SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
9937                         /* Here is a timer */
9938                         return;
9939                 }
9940         }
9941         SCTP_TCB_LOCK_ASSERT(stcb);
9942         /* Gak, we did not have a timer somewhere */
9943         SCTPDBG(SCTP_DEBUG_OUTPUT3, "Deadlock avoided starting timer on a dest at retran\n");
9944         if (asoc->alternate) {
9945                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, asoc->alternate);
9946         } else {
9947                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, asoc->primary_destination);
9948         }
9949         return;
9950 }
9951
9952 void
9953 sctp_chunk_output(struct sctp_inpcb *inp,
9954     struct sctp_tcb *stcb,
9955     int from_where,
9956     int so_locked)
9957 {
9958         /*-
9959          * Ok this is the generic chunk service queue. we must do the
9960          * following:
9961          * - See if there are retransmits pending, if so we must
9962          *   do these first.
9963          * - Service the stream queue that is next, moving any
9964          *   message (note I must get a complete message i.e.
9965          *   FIRST/MIDDLE and LAST to the out queue in one pass) and assigning
9966          *   TSN's
9967          * - Check to see if the cwnd/rwnd allows any output, if so we
9968          *   go ahead and fomulate and send the low level chunks. Making sure
9969          *   to combine any control in the control chunk queue also.
9970          */
9971         struct sctp_association *asoc;
9972         struct sctp_nets *net;
9973         int error = 0, num_out, tot_out = 0, ret = 0, reason_code;
9974         unsigned int burst_cnt = 0;
9975         struct timeval now;
9976         int now_filled = 0;
9977         int nagle_on;
9978         int frag_point = sctp_get_frag_point(stcb, &stcb->asoc);
9979         int un_sent = 0;
9980         int fr_done;
9981         unsigned int tot_frs = 0;
9982
9983         asoc = &stcb->asoc;
9984 do_it_again:
9985         /* The Nagle algorithm is only applied when handling a send call. */
9986         if (from_where == SCTP_OUTPUT_FROM_USR_SEND) {
9987                 if (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_NODELAY)) {
9988                         nagle_on = 0;
9989                 } else {
9990                         nagle_on = 1;
9991                 }
9992         } else {
9993                 nagle_on = 0;
9994         }
9995         SCTP_TCB_LOCK_ASSERT(stcb);
9996
9997         un_sent = (stcb->asoc.total_output_queue_size - stcb->asoc.total_flight);
9998
9999         if ((un_sent <= 0) &&
10000             (TAILQ_EMPTY(&asoc->control_send_queue)) &&
10001             (TAILQ_EMPTY(&asoc->asconf_send_queue)) &&
10002             (asoc->sent_queue_retran_cnt == 0) &&
10003             (asoc->trigger_reset == 0)) {
10004                 /* Nothing to do unless there is something to be sent left */
10005                 return;
10006         }
10007         /*
10008          * Do we have something to send, data or control AND a sack timer
10009          * running, if so piggy-back the sack.
10010          */
10011         if (SCTP_OS_TIMER_PENDING(&stcb->asoc.dack_timer.timer)) {
10012                 sctp_send_sack(stcb, so_locked);
10013                 sctp_timer_stop(SCTP_TIMER_TYPE_RECV, stcb->sctp_ep, stcb, NULL,
10014                     SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_3);
10015         }
10016         while (asoc->sent_queue_retran_cnt) {
10017                 /*-
10018                  * Ok, it is retransmission time only, we send out only ONE
10019                  * packet with a single call off to the retran code.
10020                  */
10021                 if (from_where == SCTP_OUTPUT_FROM_COOKIE_ACK) {
10022                         /*-
10023                          * Special hook for handling cookiess discarded
10024                          * by peer that carried data. Send cookie-ack only
10025                          * and then the next call with get the retran's.
10026                          */
10027                         (void)sctp_med_chunk_output(inp, stcb, asoc, &num_out, &reason_code, 1,
10028                             from_where,
10029                             &now, &now_filled, frag_point, so_locked);
10030                         return;
10031                 } else if (from_where != SCTP_OUTPUT_FROM_HB_TMR) {
10032                         /* if its not from a HB then do it */
10033                         fr_done = 0;
10034                         ret = sctp_chunk_retransmission(inp, stcb, asoc, &num_out, &now, &now_filled, &fr_done, so_locked);
10035                         if (fr_done) {
10036                                 tot_frs++;
10037                         }
10038                 } else {
10039                         /*
10040                          * its from any other place, we don't allow retran
10041                          * output (only control)
10042                          */
10043                         ret = 1;
10044                 }
10045                 if (ret > 0) {
10046                         /* Can't send anymore */
10047                         /*-
10048                          * now lets push out control by calling med-level
10049                          * output once. this assures that we WILL send HB's
10050                          * if queued too.
10051                          */
10052                         (void)sctp_med_chunk_output(inp, stcb, asoc, &num_out, &reason_code, 1,
10053                             from_where,
10054                             &now, &now_filled, frag_point, so_locked);
10055 #ifdef SCTP_AUDITING_ENABLED
10056                         sctp_auditing(8, inp, stcb, NULL);
10057 #endif
10058                         sctp_timer_validation(inp, stcb, asoc);
10059                         return;
10060                 }
10061                 if (ret < 0) {
10062                         /*-
10063                          * The count was off.. retran is not happening so do
10064                          * the normal retransmission.
10065                          */
10066 #ifdef SCTP_AUDITING_ENABLED
10067                         sctp_auditing(9, inp, stcb, NULL);
10068 #endif
10069                         if (ret == SCTP_RETRAN_EXIT) {
10070                                 return;
10071                         }
10072                         break;
10073                 }
10074                 if (from_where == SCTP_OUTPUT_FROM_T3) {
10075                         /* Only one transmission allowed out of a timeout */
10076 #ifdef SCTP_AUDITING_ENABLED
10077                         sctp_auditing(10, inp, stcb, NULL);
10078 #endif
10079                         /* Push out any control */
10080                         (void)sctp_med_chunk_output(inp, stcb, asoc, &num_out, &reason_code, 1, from_where,
10081                             &now, &now_filled, frag_point, so_locked);
10082                         return;
10083                 }
10084                 if ((asoc->fr_max_burst > 0) && (tot_frs >= asoc->fr_max_burst)) {
10085                         /* Hit FR burst limit */
10086                         return;
10087                 }
10088                 if ((num_out == 0) && (ret == 0)) {
10089                         /* No more retrans to send */
10090                         break;
10091                 }
10092         }
10093 #ifdef SCTP_AUDITING_ENABLED
10094         sctp_auditing(12, inp, stcb, NULL);
10095 #endif
10096         /* Check for bad destinations, if they exist move chunks around. */
10097         TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
10098                 if (!(net->dest_state & SCTP_ADDR_REACHABLE)) {
10099                         /*-
10100                          * if possible move things off of this address we
10101                          * still may send below due to the dormant state but
10102                          * we try to find an alternate address to send to
10103                          * and if we have one we move all queued data on the
10104                          * out wheel to this alternate address.
10105                          */
10106                         if (net->ref_count > 1)
10107                                 sctp_move_chunks_from_net(stcb, net);
10108                 } else {
10109                         /*-
10110                          * if ((asoc->sat_network) || (net->addr_is_local))
10111                          * { burst_limit = asoc->max_burst *
10112                          * SCTP_SAT_NETWORK_BURST_INCR; }
10113                          */
10114                         if (asoc->max_burst > 0) {
10115                                 if (SCTP_BASE_SYSCTL(sctp_use_cwnd_based_maxburst)) {
10116                                         if ((net->flight_size + (asoc->max_burst * net->mtu)) < net->cwnd) {
10117                                                 /*
10118                                                  * JRS - Use the congestion
10119                                                  * control given in the
10120                                                  * congestion control module
10121                                                  */
10122                                                 asoc->cc_functions.sctp_cwnd_update_after_output(stcb, net, asoc->max_burst);
10123                                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_MAXBURST_ENABLE) {
10124                                                         sctp_log_maxburst(stcb, net, 0, asoc->max_burst, SCTP_MAX_BURST_APPLIED);
10125                                                 }
10126                                                 SCTP_STAT_INCR(sctps_maxburstqueued);
10127                                         }
10128                                         net->fast_retran_ip = 0;
10129                                 } else {
10130                                         if (net->flight_size == 0) {
10131                                                 /*
10132                                                  * Should be decaying the
10133                                                  * cwnd here
10134                                                  */
10135                                                 ;
10136                                         }
10137                                 }
10138                         }
10139                 }
10140         }
10141         burst_cnt = 0;
10142         do {
10143                 error = sctp_med_chunk_output(inp, stcb, asoc, &num_out,
10144                     &reason_code, 0, from_where,
10145                     &now, &now_filled, frag_point, so_locked);
10146                 if (error) {
10147                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Error %d was returned from med-c-op\n", error);
10148                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_MAXBURST_ENABLE) {
10149                                 sctp_log_maxburst(stcb, asoc->primary_destination, error, burst_cnt, SCTP_MAX_BURST_ERROR_STOP);
10150                         }
10151                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
10152                                 sctp_log_cwnd(stcb, NULL, error, SCTP_SEND_NOW_COMPLETES);
10153                                 sctp_log_cwnd(stcb, NULL, 0xdeadbeef, SCTP_SEND_NOW_COMPLETES);
10154                         }
10155                         break;
10156                 }
10157                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "m-c-o put out %d\n", num_out);
10158
10159                 tot_out += num_out;
10160                 burst_cnt++;
10161                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
10162                         sctp_log_cwnd(stcb, NULL, num_out, SCTP_SEND_NOW_COMPLETES);
10163                         if (num_out == 0) {
10164                                 sctp_log_cwnd(stcb, NULL, reason_code, SCTP_SEND_NOW_COMPLETES);
10165                         }
10166                 }
10167                 if (nagle_on) {
10168                         /*
10169                          * When the Nagle algorithm is used, look at how
10170                          * much is unsent, then if its smaller than an MTU
10171                          * and we have data in flight we stop, except if we
10172                          * are handling a fragmented user message.
10173                          */
10174                         un_sent = stcb->asoc.total_output_queue_size - stcb->asoc.total_flight;
10175                         if ((un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD)) &&
10176                             (stcb->asoc.total_flight > 0)) {
10177 /*      &&                   sctp_is_feature_on(inp, SCTP_PCB_FLAGS_EXPLICIT_EOR))) {*/
10178                                 break;
10179                         }
10180                 }
10181                 if (TAILQ_EMPTY(&asoc->control_send_queue) &&
10182                     TAILQ_EMPTY(&asoc->send_queue) &&
10183                     sctp_is_there_unsent_data(stcb, so_locked) == 0) {
10184                         /* Nothing left to send */
10185                         break;
10186                 }
10187                 if ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) <= 0) {
10188                         /* Nothing left to send */
10189                         break;
10190                 }
10191         } while (num_out &&
10192             ((asoc->max_burst == 0) ||
10193             SCTP_BASE_SYSCTL(sctp_use_cwnd_based_maxburst) ||
10194             (burst_cnt < asoc->max_burst)));
10195
10196         if (SCTP_BASE_SYSCTL(sctp_use_cwnd_based_maxburst) == 0) {
10197                 if ((asoc->max_burst > 0) && (burst_cnt >= asoc->max_burst)) {
10198                         SCTP_STAT_INCR(sctps_maxburstqueued);
10199                         asoc->burst_limit_applied = 1;
10200                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_MAXBURST_ENABLE) {
10201                                 sctp_log_maxburst(stcb, asoc->primary_destination, 0, burst_cnt, SCTP_MAX_BURST_APPLIED);
10202                         }
10203                 } else {
10204                         asoc->burst_limit_applied = 0;
10205                 }
10206         }
10207         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
10208                 sctp_log_cwnd(stcb, NULL, tot_out, SCTP_SEND_NOW_COMPLETES);
10209         }
10210         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Ok, we have put out %d chunks\n",
10211             tot_out);
10212
10213         /*-
10214          * Now we need to clean up the control chunk chain if a ECNE is on
10215          * it. It must be marked as UNSENT again so next call will continue
10216          * to send it until such time that we get a CWR, to remove it.
10217          */
10218         if (stcb->asoc.ecn_echo_cnt_onq)
10219                 sctp_fix_ecn_echo(asoc);
10220
10221         if (stcb->asoc.trigger_reset) {
10222                 if (sctp_send_stream_reset_out_if_possible(stcb, so_locked) == 0) {
10223                         goto do_it_again;
10224                 }
10225         }
10226         return;
10227 }
10228
10229 int
10230 sctp_output(
10231     struct sctp_inpcb *inp,
10232     struct mbuf *m,
10233     struct sockaddr *addr,
10234     struct mbuf *control,
10235     struct thread *p,
10236     int flags)
10237 {
10238         if (inp == NULL) {
10239                 SCTP_LTRACE_ERR_RET_PKT(m, inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
10240                 return (EINVAL);
10241         }
10242
10243         if (inp->sctp_socket == NULL) {
10244                 SCTP_LTRACE_ERR_RET_PKT(m, inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
10245                 return (EINVAL);
10246         }
10247         return (sctp_sosend(inp->sctp_socket,
10248             addr,
10249             (struct uio *)NULL,
10250             m,
10251             control,
10252             flags, p
10253             ));
10254 }
10255
10256 void
10257 send_forward_tsn(struct sctp_tcb *stcb,
10258     struct sctp_association *asoc)
10259 {
10260         struct sctp_tmit_chunk *chk, *at, *tp1, *last;
10261         struct sctp_forward_tsn_chunk *fwdtsn;
10262         struct sctp_strseq *strseq;
10263         struct sctp_strseq_mid *strseq_m;
10264         uint32_t advance_peer_ack_point;
10265         unsigned int cnt_of_space, i, ovh;
10266         unsigned int space_needed;
10267         unsigned int cnt_of_skipped = 0;
10268
10269         SCTP_TCB_LOCK_ASSERT(stcb);
10270         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
10271                 if (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN) {
10272                         /* mark it to unsent */
10273                         chk->sent = SCTP_DATAGRAM_UNSENT;
10274                         chk->snd_count = 0;
10275                         /* Do we correct its output location? */
10276                         if (chk->whoTo) {
10277                                 sctp_free_remote_addr(chk->whoTo);
10278                                 chk->whoTo = NULL;
10279                         }
10280                         goto sctp_fill_in_rest;
10281                 }
10282         }
10283         /* Ok if we reach here we must build one */
10284         sctp_alloc_a_chunk(stcb, chk);
10285         if (chk == NULL) {
10286                 return;
10287         }
10288         asoc->fwd_tsn_cnt++;
10289         chk->copy_by_ref = 0;
10290         /*
10291          * We don't do the old thing here since this is used not for on-wire
10292          * but to tell if we are sending a fwd-tsn by the stack during
10293          * output. And if its a IFORWARD or a FORWARD it is a fwd-tsn.
10294          */
10295         chk->rec.chunk_id.id = SCTP_FORWARD_CUM_TSN;
10296         chk->rec.chunk_id.can_take_data = 0;
10297         chk->flags = 0;
10298         chk->asoc = asoc;
10299         chk->whoTo = NULL;
10300         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
10301         if (chk->data == NULL) {
10302                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
10303                 return;
10304         }
10305         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
10306         chk->sent = SCTP_DATAGRAM_UNSENT;
10307         chk->snd_count = 0;
10308         TAILQ_INSERT_TAIL(&asoc->control_send_queue, chk, sctp_next);
10309         asoc->ctrl_queue_cnt++;
10310 sctp_fill_in_rest:
10311         /*-
10312          * Here we go through and fill out the part that deals with
10313          * stream/seq of the ones we skip.
10314          */
10315         SCTP_BUF_LEN(chk->data) = 0;
10316         TAILQ_FOREACH(at, &asoc->sent_queue, sctp_next) {
10317                 if ((at->sent != SCTP_FORWARD_TSN_SKIP) &&
10318                     (at->sent != SCTP_DATAGRAM_NR_ACKED)) {
10319                         /* no more to look at */
10320                         break;
10321                 }
10322                 if (!asoc->idata_supported && (at->rec.data.rcv_flags & SCTP_DATA_UNORDERED)) {
10323                         /* We don't report these */
10324                         continue;
10325                 }
10326                 cnt_of_skipped++;
10327         }
10328         if (asoc->idata_supported) {
10329                 space_needed = (sizeof(struct sctp_forward_tsn_chunk) +
10330                     (cnt_of_skipped * sizeof(struct sctp_strseq_mid)));
10331         } else {
10332                 space_needed = (sizeof(struct sctp_forward_tsn_chunk) +
10333                     (cnt_of_skipped * sizeof(struct sctp_strseq)));
10334         }
10335         cnt_of_space = (unsigned int)M_TRAILINGSPACE(chk->data);
10336
10337         if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
10338                 ovh = SCTP_MIN_OVERHEAD;
10339         } else {
10340                 ovh = SCTP_MIN_V4_OVERHEAD;
10341         }
10342         if (cnt_of_space > (asoc->smallest_mtu - ovh)) {
10343                 /* trim to a mtu size */
10344                 cnt_of_space = asoc->smallest_mtu - ovh;
10345         }
10346         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_TRY_ADVANCE) {
10347                 sctp_misc_ints(SCTP_FWD_TSN_CHECK,
10348                     0xff, 0, cnt_of_skipped,
10349                     asoc->advanced_peer_ack_point);
10350         }
10351         advance_peer_ack_point = asoc->advanced_peer_ack_point;
10352         if (cnt_of_space < space_needed) {
10353                 /*-
10354                  * ok we must trim down the chunk by lowering the
10355                  * advance peer ack point.
10356                  */
10357                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_TRY_ADVANCE) {
10358                         sctp_misc_ints(SCTP_FWD_TSN_CHECK,
10359                             0xff, 0xff, cnt_of_space,
10360                             space_needed);
10361                 }
10362                 cnt_of_skipped = cnt_of_space - sizeof(struct sctp_forward_tsn_chunk);
10363                 if (asoc->idata_supported) {
10364                         cnt_of_skipped /= sizeof(struct sctp_strseq_mid);
10365                 } else {
10366                         cnt_of_skipped /= sizeof(struct sctp_strseq);
10367                 }
10368                 /*-
10369                  * Go through and find the TSN that will be the one
10370                  * we report.
10371                  */
10372                 at = TAILQ_FIRST(&asoc->sent_queue);
10373                 if (at != NULL) {
10374                         for (i = 0; i < cnt_of_skipped; i++) {
10375                                 tp1 = TAILQ_NEXT(at, sctp_next);
10376                                 if (tp1 == NULL) {
10377                                         break;
10378                                 }
10379                                 at = tp1;
10380                         }
10381                 }
10382                 if (at && SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_TRY_ADVANCE) {
10383                         sctp_misc_ints(SCTP_FWD_TSN_CHECK,
10384                             0xff, cnt_of_skipped, at->rec.data.tsn,
10385                             asoc->advanced_peer_ack_point);
10386                 }
10387                 last = at;
10388                 /*-
10389                  * last now points to last one I can report, update
10390                  * peer ack point
10391                  */
10392                 if (last) {
10393                         advance_peer_ack_point = last->rec.data.tsn;
10394                 }
10395                 if (asoc->idata_supported) {
10396                         space_needed = sizeof(struct sctp_forward_tsn_chunk) +
10397                             cnt_of_skipped * sizeof(struct sctp_strseq_mid);
10398                 } else {
10399                         space_needed = sizeof(struct sctp_forward_tsn_chunk) +
10400                             cnt_of_skipped * sizeof(struct sctp_strseq);
10401                 }
10402         }
10403         chk->send_size = space_needed;
10404         /* Setup the chunk */
10405         fwdtsn = mtod(chk->data, struct sctp_forward_tsn_chunk *);
10406         fwdtsn->ch.chunk_length = htons(chk->send_size);
10407         fwdtsn->ch.chunk_flags = 0;
10408         if (asoc->idata_supported) {
10409                 fwdtsn->ch.chunk_type = SCTP_IFORWARD_CUM_TSN;
10410         } else {
10411                 fwdtsn->ch.chunk_type = SCTP_FORWARD_CUM_TSN;
10412         }
10413         fwdtsn->new_cumulative_tsn = htonl(advance_peer_ack_point);
10414         SCTP_BUF_LEN(chk->data) = chk->send_size;
10415         fwdtsn++;
10416         /*-
10417          * Move pointer to after the fwdtsn and transfer to the
10418          * strseq pointer.
10419          */
10420         if (asoc->idata_supported) {
10421                 strseq_m = (struct sctp_strseq_mid *)fwdtsn;
10422                 strseq = NULL;
10423         } else {
10424                 strseq = (struct sctp_strseq *)fwdtsn;
10425                 strseq_m = NULL;
10426         }
10427         /*-
10428          * Now populate the strseq list. This is done blindly
10429          * without pulling out duplicate stream info. This is
10430          * inefficent but won't harm the process since the peer will
10431          * look at these in sequence and will thus release anything.
10432          * It could mean we exceed the PMTU and chop off some that
10433          * we could have included.. but this is unlikely (aka 1432/4
10434          * would mean 300+ stream seq's would have to be reported in
10435          * one FWD-TSN. With a bit of work we can later FIX this to
10436          * optimize and pull out duplicates.. but it does add more
10437          * overhead. So for now... not!
10438          */
10439         i = 0;
10440         TAILQ_FOREACH(at, &asoc->sent_queue, sctp_next) {
10441                 if (i >= cnt_of_skipped) {
10442                         break;
10443                 }
10444                 if (!asoc->idata_supported && (at->rec.data.rcv_flags & SCTP_DATA_UNORDERED)) {
10445                         /* We don't report these */
10446                         continue;
10447                 }
10448                 if (at->rec.data.tsn == advance_peer_ack_point) {
10449                         at->rec.data.fwd_tsn_cnt = 0;
10450                 }
10451                 if (asoc->idata_supported) {
10452                         strseq_m->sid = htons(at->rec.data.sid);
10453                         if (at->rec.data.rcv_flags & SCTP_DATA_UNORDERED) {
10454                                 strseq_m->flags = htons(PR_SCTP_UNORDERED_FLAG);
10455                         } else {
10456                                 strseq_m->flags = 0;
10457                         }
10458                         strseq_m->mid = htonl(at->rec.data.mid);
10459                         strseq_m++;
10460                 } else {
10461                         strseq->sid = htons(at->rec.data.sid);
10462                         strseq->ssn = htons((uint16_t)at->rec.data.mid);
10463                         strseq++;
10464                 }
10465                 i++;
10466         }
10467         return;
10468 }
10469
10470 void
10471 sctp_send_sack(struct sctp_tcb *stcb, int so_locked)
10472 {
10473         /*-
10474          * Queue up a SACK or NR-SACK in the control queue.
10475          * We must first check to see if a SACK or NR-SACK is
10476          * somehow on the control queue.
10477          * If so, we will take and and remove the old one.
10478          */
10479         struct sctp_association *asoc;
10480         struct sctp_tmit_chunk *chk, *a_chk;
10481         struct sctp_sack_chunk *sack;
10482         struct sctp_nr_sack_chunk *nr_sack;
10483         struct sctp_gap_ack_block *gap_descriptor;
10484         const struct sack_track *selector;
10485         int mergeable = 0;
10486         int offset;
10487         caddr_t limit;
10488         uint32_t *dup;
10489         int limit_reached = 0;
10490         unsigned int i, siz, j;
10491         unsigned int num_gap_blocks = 0, num_nr_gap_blocks = 0, space;
10492         int num_dups = 0;
10493         int space_req;
10494         uint32_t highest_tsn;
10495         uint8_t flags;
10496         uint8_t type;
10497         uint8_t tsn_map;
10498
10499         if (stcb->asoc.nrsack_supported == 1) {
10500                 type = SCTP_NR_SELECTIVE_ACK;
10501         } else {
10502                 type = SCTP_SELECTIVE_ACK;
10503         }
10504         a_chk = NULL;
10505         asoc = &stcb->asoc;
10506         SCTP_TCB_LOCK_ASSERT(stcb);
10507         if (asoc->last_data_chunk_from == NULL) {
10508                 /* Hmm we never received anything */
10509                 return;
10510         }
10511         sctp_slide_mapping_arrays(stcb);
10512         sctp_set_rwnd(stcb, asoc);
10513         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
10514                 if (chk->rec.chunk_id.id == type) {
10515                         /* Hmm, found a sack already on queue, remove it */
10516                         TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
10517                         asoc->ctrl_queue_cnt--;
10518                         a_chk = chk;
10519                         if (a_chk->data) {
10520                                 sctp_m_freem(a_chk->data);
10521                                 a_chk->data = NULL;
10522                         }
10523                         if (a_chk->whoTo) {
10524                                 sctp_free_remote_addr(a_chk->whoTo);
10525                                 a_chk->whoTo = NULL;
10526                         }
10527                         break;
10528                 }
10529         }
10530         if (a_chk == NULL) {
10531                 sctp_alloc_a_chunk(stcb, a_chk);
10532                 if (a_chk == NULL) {
10533                         /* No memory so we drop the idea, and set a timer */
10534                         if (stcb->asoc.delayed_ack) {
10535                                 sctp_timer_stop(SCTP_TIMER_TYPE_RECV,
10536                                     stcb->sctp_ep, stcb, NULL,
10537                                     SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_4);
10538                                 sctp_timer_start(SCTP_TIMER_TYPE_RECV,
10539                                     stcb->sctp_ep, stcb, NULL);
10540                         } else {
10541                                 stcb->asoc.send_sack = 1;
10542                         }
10543                         return;
10544                 }
10545                 a_chk->copy_by_ref = 0;
10546                 a_chk->rec.chunk_id.id = type;
10547                 a_chk->rec.chunk_id.can_take_data = 1;
10548         }
10549         /* Clear our pkt counts */
10550         asoc->data_pkts_seen = 0;
10551
10552         a_chk->flags = 0;
10553         a_chk->asoc = asoc;
10554         a_chk->snd_count = 0;
10555         a_chk->send_size = 0;   /* fill in later */
10556         a_chk->sent = SCTP_DATAGRAM_UNSENT;
10557         a_chk->whoTo = NULL;
10558
10559         if (!(asoc->last_data_chunk_from->dest_state & SCTP_ADDR_REACHABLE)) {
10560                 /*-
10561                  * Ok, the destination for the SACK is unreachable, lets see if
10562                  * we can select an alternate to asoc->last_data_chunk_from
10563                  */
10564                 a_chk->whoTo = sctp_find_alternate_net(stcb, asoc->last_data_chunk_from, 0);
10565                 if (a_chk->whoTo == NULL) {
10566                         /* Nope, no alternate */
10567                         a_chk->whoTo = asoc->last_data_chunk_from;
10568                 }
10569         } else {
10570                 a_chk->whoTo = asoc->last_data_chunk_from;
10571         }
10572         if (a_chk->whoTo) {
10573                 atomic_add_int(&a_chk->whoTo->ref_count, 1);
10574         }
10575         if (SCTP_TSN_GT(asoc->highest_tsn_inside_map, asoc->highest_tsn_inside_nr_map)) {
10576                 highest_tsn = asoc->highest_tsn_inside_map;
10577         } else {
10578                 highest_tsn = asoc->highest_tsn_inside_nr_map;
10579         }
10580         if (highest_tsn == asoc->cumulative_tsn) {
10581                 /* no gaps */
10582                 if (type == SCTP_SELECTIVE_ACK) {
10583                         space_req = sizeof(struct sctp_sack_chunk);
10584                 } else {
10585                         space_req = sizeof(struct sctp_nr_sack_chunk);
10586                 }
10587         } else {
10588                 /* gaps get a cluster */
10589                 space_req = MCLBYTES;
10590         }
10591         /* Ok now lets formulate a MBUF with our sack */
10592         a_chk->data = sctp_get_mbuf_for_msg(space_req, 0, M_NOWAIT, 1, MT_DATA);
10593         if ((a_chk->data == NULL) ||
10594             (a_chk->whoTo == NULL)) {
10595                 /* rats, no mbuf memory */
10596                 if (a_chk->data) {
10597                         /* was a problem with the destination */
10598                         sctp_m_freem(a_chk->data);
10599                         a_chk->data = NULL;
10600                 }
10601                 sctp_free_a_chunk(stcb, a_chk, so_locked);
10602                 /* sa_ignore NO_NULL_CHK */
10603                 if (stcb->asoc.delayed_ack) {
10604                         sctp_timer_stop(SCTP_TIMER_TYPE_RECV,
10605                             stcb->sctp_ep, stcb, NULL,
10606                             SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_5);
10607                         sctp_timer_start(SCTP_TIMER_TYPE_RECV,
10608                             stcb->sctp_ep, stcb, NULL);
10609                 } else {
10610                         stcb->asoc.send_sack = 1;
10611                 }
10612                 return;
10613         }
10614         /* ok, lets go through and fill it in */
10615         SCTP_BUF_RESV_UF(a_chk->data, SCTP_MIN_OVERHEAD);
10616         space = (unsigned int)M_TRAILINGSPACE(a_chk->data);
10617         if (space > (a_chk->whoTo->mtu - SCTP_MIN_OVERHEAD)) {
10618                 space = (a_chk->whoTo->mtu - SCTP_MIN_OVERHEAD);
10619         }
10620         limit = mtod(a_chk->data, caddr_t);
10621         limit += space;
10622
10623         flags = 0;
10624
10625         if ((asoc->sctp_cmt_on_off > 0) &&
10626             SCTP_BASE_SYSCTL(sctp_cmt_use_dac)) {
10627                 /*-
10628                  * CMT DAC algorithm: If 2 (i.e., 0x10) packets have been
10629                  * received, then set high bit to 1, else 0. Reset
10630                  * pkts_rcvd.
10631                  */
10632                 flags |= (asoc->cmt_dac_pkts_rcvd << 6);
10633                 asoc->cmt_dac_pkts_rcvd = 0;
10634         }
10635 #ifdef SCTP_ASOCLOG_OF_TSNS
10636         stcb->asoc.cumack_logsnt[stcb->asoc.cumack_log_atsnt] = asoc->cumulative_tsn;
10637         stcb->asoc.cumack_log_atsnt++;
10638         if (stcb->asoc.cumack_log_atsnt >= SCTP_TSN_LOG_SIZE) {
10639                 stcb->asoc.cumack_log_atsnt = 0;
10640         }
10641 #endif
10642         /* reset the readers interpretation */
10643         stcb->freed_by_sorcv_sincelast = 0;
10644
10645         if (type == SCTP_SELECTIVE_ACK) {
10646                 sack = mtod(a_chk->data, struct sctp_sack_chunk *);
10647                 nr_sack = NULL;
10648                 gap_descriptor = (struct sctp_gap_ack_block *)((caddr_t)sack + sizeof(struct sctp_sack_chunk));
10649                 if (highest_tsn > asoc->mapping_array_base_tsn) {
10650                         siz = (((highest_tsn - asoc->mapping_array_base_tsn) + 1) + 7) / 8;
10651                 } else {
10652                         siz = (((MAX_TSN - asoc->mapping_array_base_tsn) + 1) + highest_tsn + 7) / 8;
10653                 }
10654         } else {
10655                 sack = NULL;
10656                 nr_sack = mtod(a_chk->data, struct sctp_nr_sack_chunk *);
10657                 gap_descriptor = (struct sctp_gap_ack_block *)((caddr_t)nr_sack + sizeof(struct sctp_nr_sack_chunk));
10658                 if (asoc->highest_tsn_inside_map > asoc->mapping_array_base_tsn) {
10659                         siz = (((asoc->highest_tsn_inside_map - asoc->mapping_array_base_tsn) + 1) + 7) / 8;
10660                 } else {
10661                         siz = (((MAX_TSN - asoc->mapping_array_base_tsn) + 1) + asoc->highest_tsn_inside_map + 7) / 8;
10662                 }
10663         }
10664
10665         if (SCTP_TSN_GT(asoc->mapping_array_base_tsn, asoc->cumulative_tsn)) {
10666                 offset = 1;
10667         } else {
10668                 offset = asoc->mapping_array_base_tsn - asoc->cumulative_tsn;
10669         }
10670         if (((type == SCTP_SELECTIVE_ACK) &&
10671             SCTP_TSN_GT(highest_tsn, asoc->cumulative_tsn)) ||
10672             ((type == SCTP_NR_SELECTIVE_ACK) &&
10673             SCTP_TSN_GT(asoc->highest_tsn_inside_map, asoc->cumulative_tsn))) {
10674                 /* we have a gap .. maybe */
10675                 for (i = 0; i < siz; i++) {
10676                         tsn_map = asoc->mapping_array[i];
10677                         if (type == SCTP_SELECTIVE_ACK) {
10678                                 tsn_map |= asoc->nr_mapping_array[i];
10679                         }
10680                         if (i == 0) {
10681                                 /*
10682                                  * Clear all bits corresponding to TSNs
10683                                  * smaller or equal to the cumulative TSN.
10684                                  */
10685                                 tsn_map &= (~0U << (1 - offset));
10686                         }
10687                         selector = &sack_array[tsn_map];
10688                         if (mergeable && selector->right_edge) {
10689                                 /*
10690                                  * Backup, left and right edges were ok to
10691                                  * merge.
10692                                  */
10693                                 num_gap_blocks--;
10694                                 gap_descriptor--;
10695                         }
10696                         if (selector->num_entries == 0)
10697                                 mergeable = 0;
10698                         else {
10699                                 for (j = 0; j < selector->num_entries; j++) {
10700                                         if (mergeable && selector->right_edge) {
10701                                                 /*
10702                                                  * do a merge by NOT setting
10703                                                  * the left side
10704                                                  */
10705                                                 mergeable = 0;
10706                                         } else {
10707                                                 /*
10708                                                  * no merge, set the left
10709                                                  * side
10710                                                  */
10711                                                 mergeable = 0;
10712                                                 gap_descriptor->start = htons((selector->gaps[j].start + offset));
10713                                         }
10714                                         gap_descriptor->end = htons((selector->gaps[j].end + offset));
10715                                         num_gap_blocks++;
10716                                         gap_descriptor++;
10717                                         if (((caddr_t)gap_descriptor + sizeof(struct sctp_gap_ack_block)) > limit) {
10718                                                 /* no more room */
10719                                                 limit_reached = 1;
10720                                                 break;
10721                                         }
10722                                 }
10723                                 if (selector->left_edge) {
10724                                         mergeable = 1;
10725                                 }
10726                         }
10727                         if (limit_reached) {
10728                                 /* Reached the limit stop */
10729                                 break;
10730                         }
10731                         offset += 8;
10732                 }
10733         }
10734         if ((type == SCTP_NR_SELECTIVE_ACK) &&
10735             (limit_reached == 0)) {
10736                 mergeable = 0;
10737
10738                 if (asoc->highest_tsn_inside_nr_map > asoc->mapping_array_base_tsn) {
10739                         siz = (((asoc->highest_tsn_inside_nr_map - asoc->mapping_array_base_tsn) + 1) + 7) / 8;
10740                 } else {
10741                         siz = (((MAX_TSN - asoc->mapping_array_base_tsn) + 1) + asoc->highest_tsn_inside_nr_map + 7) / 8;
10742                 }
10743
10744                 if (SCTP_TSN_GT(asoc->mapping_array_base_tsn, asoc->cumulative_tsn)) {
10745                         offset = 1;
10746                 } else {
10747                         offset = asoc->mapping_array_base_tsn - asoc->cumulative_tsn;
10748                 }
10749                 if (SCTP_TSN_GT(asoc->highest_tsn_inside_nr_map, asoc->cumulative_tsn)) {
10750                         /* we have a gap .. maybe */
10751                         for (i = 0; i < siz; i++) {
10752                                 tsn_map = asoc->nr_mapping_array[i];
10753                                 if (i == 0) {
10754                                         /*
10755                                          * Clear all bits corresponding to
10756                                          * TSNs smaller or equal to the
10757                                          * cumulative TSN.
10758                                          */
10759                                         tsn_map &= (~0U << (1 - offset));
10760                                 }
10761                                 selector = &sack_array[tsn_map];
10762                                 if (mergeable && selector->right_edge) {
10763                                         /*
10764                                          * Backup, left and right edges were
10765                                          * ok to merge.
10766                                          */
10767                                         num_nr_gap_blocks--;
10768                                         gap_descriptor--;
10769                                 }
10770                                 if (selector->num_entries == 0)
10771                                         mergeable = 0;
10772                                 else {
10773                                         for (j = 0; j < selector->num_entries; j++) {
10774                                                 if (mergeable && selector->right_edge) {
10775                                                         /*
10776                                                          * do a merge by NOT
10777                                                          * setting the left
10778                                                          * side
10779                                                          */
10780                                                         mergeable = 0;
10781                                                 } else {
10782                                                         /*
10783                                                          * no merge, set the
10784                                                          * left side
10785                                                          */
10786                                                         mergeable = 0;
10787                                                         gap_descriptor->start = htons((selector->gaps[j].start + offset));
10788                                                 }
10789                                                 gap_descriptor->end = htons((selector->gaps[j].end + offset));
10790                                                 num_nr_gap_blocks++;
10791                                                 gap_descriptor++;
10792                                                 if (((caddr_t)gap_descriptor + sizeof(struct sctp_gap_ack_block)) > limit) {
10793                                                         /* no more room */
10794                                                         limit_reached = 1;
10795                                                         break;
10796                                                 }
10797                                         }
10798                                         if (selector->left_edge) {
10799                                                 mergeable = 1;
10800                                         }
10801                                 }
10802                                 if (limit_reached) {
10803                                         /* Reached the limit stop */
10804                                         break;
10805                                 }
10806                                 offset += 8;
10807                         }
10808                 }
10809         }
10810         /* now we must add any dups we are going to report. */
10811         if ((limit_reached == 0) && (asoc->numduptsns)) {
10812                 dup = (uint32_t *)gap_descriptor;
10813                 for (i = 0; i < asoc->numduptsns; i++) {
10814                         *dup = htonl(asoc->dup_tsns[i]);
10815                         dup++;
10816                         num_dups++;
10817                         if (((caddr_t)dup + sizeof(uint32_t)) > limit) {
10818                                 /* no more room */
10819                                 break;
10820                         }
10821                 }
10822                 asoc->numduptsns = 0;
10823         }
10824         /*
10825          * now that the chunk is prepared queue it to the control chunk
10826          * queue.
10827          */
10828         if (type == SCTP_SELECTIVE_ACK) {
10829                 a_chk->send_size = (uint16_t)(sizeof(struct sctp_sack_chunk) +
10830                     (num_gap_blocks + num_nr_gap_blocks) * sizeof(struct sctp_gap_ack_block) +
10831                     num_dups * sizeof(int32_t));
10832                 SCTP_BUF_LEN(a_chk->data) = a_chk->send_size;
10833                 sack->sack.cum_tsn_ack = htonl(asoc->cumulative_tsn);
10834                 sack->sack.a_rwnd = htonl(asoc->my_rwnd);
10835                 sack->sack.num_gap_ack_blks = htons(num_gap_blocks);
10836                 sack->sack.num_dup_tsns = htons(num_dups);
10837                 sack->ch.chunk_type = type;
10838                 sack->ch.chunk_flags = flags;
10839                 sack->ch.chunk_length = htons(a_chk->send_size);
10840         } else {
10841                 a_chk->send_size = (uint16_t)(sizeof(struct sctp_nr_sack_chunk) +
10842                     (num_gap_blocks + num_nr_gap_blocks) * sizeof(struct sctp_gap_ack_block) +
10843                     num_dups * sizeof(int32_t));
10844                 SCTP_BUF_LEN(a_chk->data) = a_chk->send_size;
10845                 nr_sack->nr_sack.cum_tsn_ack = htonl(asoc->cumulative_tsn);
10846                 nr_sack->nr_sack.a_rwnd = htonl(asoc->my_rwnd);
10847                 nr_sack->nr_sack.num_gap_ack_blks = htons(num_gap_blocks);
10848                 nr_sack->nr_sack.num_nr_gap_ack_blks = htons(num_nr_gap_blocks);
10849                 nr_sack->nr_sack.num_dup_tsns = htons(num_dups);
10850                 nr_sack->nr_sack.reserved = 0;
10851                 nr_sack->ch.chunk_type = type;
10852                 nr_sack->ch.chunk_flags = flags;
10853                 nr_sack->ch.chunk_length = htons(a_chk->send_size);
10854         }
10855         TAILQ_INSERT_TAIL(&asoc->control_send_queue, a_chk, sctp_next);
10856         asoc->my_last_reported_rwnd = asoc->my_rwnd;
10857         asoc->ctrl_queue_cnt++;
10858         asoc->send_sack = 0;
10859         SCTP_STAT_INCR(sctps_sendsacks);
10860         return;
10861 }
10862
10863 void
10864 sctp_send_abort_tcb(struct sctp_tcb *stcb, struct mbuf *operr, int so_locked)
10865 {
10866         struct mbuf *m_abort, *m, *m_last;
10867         struct mbuf *m_out, *m_end = NULL;
10868         struct sctp_abort_chunk *abort;
10869         struct sctp_auth_chunk *auth = NULL;
10870         struct sctp_nets *net;
10871         uint32_t vtag;
10872         uint32_t auth_offset = 0;
10873         int error;
10874         uint16_t cause_len, chunk_len, padding_len;
10875
10876         SCTP_TCB_LOCK_ASSERT(stcb);
10877         /*-
10878          * Add an AUTH chunk, if chunk requires it and save the offset into
10879          * the chain for AUTH
10880          */
10881         if (sctp_auth_is_required_chunk(SCTP_ABORT_ASSOCIATION,
10882             stcb->asoc.peer_auth_chunks)) {
10883                 m_out = sctp_add_auth_chunk(NULL, &m_end, &auth, &auth_offset,
10884                     stcb, SCTP_ABORT_ASSOCIATION);
10885                 SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
10886         } else {
10887                 m_out = NULL;
10888         }
10889         m_abort = sctp_get_mbuf_for_msg(sizeof(struct sctp_abort_chunk), 0, M_NOWAIT, 1, MT_HEADER);
10890         if (m_abort == NULL) {
10891                 if (m_out) {
10892                         sctp_m_freem(m_out);
10893                 }
10894                 if (operr) {
10895                         sctp_m_freem(operr);
10896                 }
10897                 return;
10898         }
10899         /* link in any error */
10900         SCTP_BUF_NEXT(m_abort) = operr;
10901         cause_len = 0;
10902         m_last = NULL;
10903         for (m = operr; m; m = SCTP_BUF_NEXT(m)) {
10904                 cause_len += (uint16_t)SCTP_BUF_LEN(m);
10905                 if (SCTP_BUF_NEXT(m) == NULL) {
10906                         m_last = m;
10907                 }
10908         }
10909         SCTP_BUF_LEN(m_abort) = sizeof(struct sctp_abort_chunk);
10910         chunk_len = (uint16_t)sizeof(struct sctp_abort_chunk) + cause_len;
10911         padding_len = SCTP_SIZE32(chunk_len) - chunk_len;
10912         if (m_out == NULL) {
10913                 /* NO Auth chunk prepended, so reserve space in front */
10914                 SCTP_BUF_RESV_UF(m_abort, SCTP_MIN_OVERHEAD);
10915                 m_out = m_abort;
10916         } else {
10917                 /* Put AUTH chunk at the front of the chain */
10918                 SCTP_BUF_NEXT(m_end) = m_abort;
10919         }
10920         if (stcb->asoc.alternate) {
10921                 net = stcb->asoc.alternate;
10922         } else {
10923                 net = stcb->asoc.primary_destination;
10924         }
10925         /* Fill in the ABORT chunk header. */
10926         abort = mtod(m_abort, struct sctp_abort_chunk *);
10927         abort->ch.chunk_type = SCTP_ABORT_ASSOCIATION;
10928         if (stcb->asoc.peer_vtag == 0) {
10929                 /* This happens iff the assoc is in COOKIE-WAIT state. */
10930                 vtag = stcb->asoc.my_vtag;
10931                 abort->ch.chunk_flags = SCTP_HAD_NO_TCB;
10932         } else {
10933                 vtag = stcb->asoc.peer_vtag;
10934                 abort->ch.chunk_flags = 0;
10935         }
10936         abort->ch.chunk_length = htons(chunk_len);
10937         /* Add padding, if necessary. */
10938         if (padding_len > 0) {
10939                 if ((m_last == NULL) ||
10940                     (sctp_add_pad_tombuf(m_last, padding_len) == NULL)) {
10941                         sctp_m_freem(m_out);
10942                         return;
10943                 }
10944         }
10945         if ((error = sctp_lowlevel_chunk_output(stcb->sctp_ep, stcb, net,
10946             (struct sockaddr *)&net->ro._l_addr,
10947             m_out, auth_offset, auth, stcb->asoc.authinfo.active_keyid, 1, 0, 0,
10948             stcb->sctp_ep->sctp_lport, stcb->rport, htonl(vtag),
10949             stcb->asoc.primary_destination->port, NULL,
10950             0, 0,
10951             so_locked))) {
10952                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
10953                 if (error == ENOBUFS) {
10954                         stcb->asoc.ifp_had_enobuf = 1;
10955                         SCTP_STAT_INCR(sctps_lowlevelerr);
10956                 }
10957         } else {
10958                 stcb->asoc.ifp_had_enobuf = 0;
10959         }
10960         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
10961 }
10962
10963 void
10964 sctp_send_shutdown_complete(struct sctp_tcb *stcb,
10965     struct sctp_nets *net,
10966     int reflect_vtag)
10967 {
10968         /* formulate and SEND a SHUTDOWN-COMPLETE */
10969         struct mbuf *m_shutdown_comp;
10970         struct sctp_shutdown_complete_chunk *shutdown_complete;
10971         uint32_t vtag;
10972         int error;
10973         uint8_t flags;
10974
10975         m_shutdown_comp = sctp_get_mbuf_for_msg(sizeof(struct sctp_chunkhdr), 0, M_NOWAIT, 1, MT_HEADER);
10976         if (m_shutdown_comp == NULL) {
10977                 /* no mbuf's */
10978                 return;
10979         }
10980         if (reflect_vtag) {
10981                 flags = SCTP_HAD_NO_TCB;
10982                 vtag = stcb->asoc.my_vtag;
10983         } else {
10984                 flags = 0;
10985                 vtag = stcb->asoc.peer_vtag;
10986         }
10987         shutdown_complete = mtod(m_shutdown_comp, struct sctp_shutdown_complete_chunk *);
10988         shutdown_complete->ch.chunk_type = SCTP_SHUTDOWN_COMPLETE;
10989         shutdown_complete->ch.chunk_flags = flags;
10990         shutdown_complete->ch.chunk_length = htons(sizeof(struct sctp_shutdown_complete_chunk));
10991         SCTP_BUF_LEN(m_shutdown_comp) = sizeof(struct sctp_shutdown_complete_chunk);
10992         if ((error = sctp_lowlevel_chunk_output(stcb->sctp_ep, stcb, net,
10993             (struct sockaddr *)&net->ro._l_addr,
10994             m_shutdown_comp, 0, NULL, 0, 1, 0, 0,
10995             stcb->sctp_ep->sctp_lport, stcb->rport,
10996             htonl(vtag),
10997             net->port, NULL,
10998             0, 0,
10999             SCTP_SO_NOT_LOCKED))) {
11000                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
11001                 if (error == ENOBUFS) {
11002                         stcb->asoc.ifp_had_enobuf = 1;
11003                         SCTP_STAT_INCR(sctps_lowlevelerr);
11004                 }
11005         } else {
11006                 stcb->asoc.ifp_had_enobuf = 0;
11007         }
11008         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
11009         return;
11010 }
11011
11012 static void
11013 sctp_send_resp_msg(struct sockaddr *src, struct sockaddr *dst,
11014     struct sctphdr *sh, uint32_t vtag,
11015     uint8_t type, struct mbuf *cause,
11016     uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum,
11017     uint32_t vrf_id, uint16_t port)
11018 {
11019         struct mbuf *o_pak;
11020         struct mbuf *mout;
11021         struct sctphdr *shout;
11022         struct sctp_chunkhdr *ch;
11023 #if defined(INET) || defined(INET6)
11024         struct udphdr *udp;
11025 #endif
11026         int ret, len, cause_len, padding_len;
11027 #ifdef INET
11028         struct sockaddr_in *src_sin, *dst_sin;
11029         struct ip *ip;
11030 #endif
11031 #ifdef INET6
11032         struct sockaddr_in6 *src_sin6, *dst_sin6;
11033         struct ip6_hdr *ip6;
11034 #endif
11035
11036         /* Compute the length of the cause and add final padding. */
11037         cause_len = 0;
11038         if (cause != NULL) {
11039                 struct mbuf *m_at, *m_last = NULL;
11040
11041                 for (m_at = cause; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
11042                         if (SCTP_BUF_NEXT(m_at) == NULL)
11043                                 m_last = m_at;
11044                         cause_len += SCTP_BUF_LEN(m_at);
11045                 }
11046                 padding_len = cause_len % 4;
11047                 if (padding_len != 0) {
11048                         padding_len = 4 - padding_len;
11049                 }
11050                 if (padding_len != 0) {
11051                         if (sctp_add_pad_tombuf(m_last, padding_len) == NULL) {
11052                                 sctp_m_freem(cause);
11053                                 return;
11054                         }
11055                 }
11056         } else {
11057                 padding_len = 0;
11058         }
11059         /* Get an mbuf for the header. */
11060         len = sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
11061         switch (dst->sa_family) {
11062 #ifdef INET
11063         case AF_INET:
11064                 len += sizeof(struct ip);
11065                 break;
11066 #endif
11067 #ifdef INET6
11068         case AF_INET6:
11069                 len += sizeof(struct ip6_hdr);
11070                 break;
11071 #endif
11072         default:
11073                 break;
11074         }
11075 #if defined(INET) || defined(INET6)
11076         if (port) {
11077                 len += sizeof(struct udphdr);
11078         }
11079 #endif
11080         mout = sctp_get_mbuf_for_msg(len + max_linkhdr, 1, M_NOWAIT, 1, MT_DATA);
11081         if (mout == NULL) {
11082                 if (cause) {
11083                         sctp_m_freem(cause);
11084                 }
11085                 return;
11086         }
11087         SCTP_BUF_RESV_UF(mout, max_linkhdr);
11088         SCTP_BUF_LEN(mout) = len;
11089         SCTP_BUF_NEXT(mout) = cause;
11090         M_SETFIB(mout, fibnum);
11091         mout->m_pkthdr.flowid = mflowid;
11092         M_HASHTYPE_SET(mout, mflowtype);
11093 #ifdef INET
11094         ip = NULL;
11095 #endif
11096 #ifdef INET6
11097         ip6 = NULL;
11098 #endif
11099         switch (dst->sa_family) {
11100 #ifdef INET
11101         case AF_INET:
11102                 src_sin = (struct sockaddr_in *)src;
11103                 dst_sin = (struct sockaddr_in *)dst;
11104                 ip = mtod(mout, struct ip *);
11105                 ip->ip_v = IPVERSION;
11106                 ip->ip_hl = (sizeof(struct ip) >> 2);
11107                 ip->ip_tos = 0;
11108                 ip->ip_off = htons(IP_DF);
11109                 ip_fillid(ip);
11110                 ip->ip_ttl = MODULE_GLOBAL(ip_defttl);
11111                 if (port) {
11112                         ip->ip_p = IPPROTO_UDP;
11113                 } else {
11114                         ip->ip_p = IPPROTO_SCTP;
11115                 }
11116                 ip->ip_src.s_addr = dst_sin->sin_addr.s_addr;
11117                 ip->ip_dst.s_addr = src_sin->sin_addr.s_addr;
11118                 ip->ip_sum = 0;
11119                 len = sizeof(struct ip);
11120                 shout = (struct sctphdr *)((caddr_t)ip + len);
11121                 break;
11122 #endif
11123 #ifdef INET6
11124         case AF_INET6:
11125                 src_sin6 = (struct sockaddr_in6 *)src;
11126                 dst_sin6 = (struct sockaddr_in6 *)dst;
11127                 ip6 = mtod(mout, struct ip6_hdr *);
11128                 ip6->ip6_flow = htonl(0x60000000);
11129                 if (V_ip6_auto_flowlabel) {
11130                         ip6->ip6_flow |= (htonl(ip6_randomflowlabel()) & IPV6_FLOWLABEL_MASK);
11131                 }
11132                 ip6->ip6_hlim = MODULE_GLOBAL(ip6_defhlim);
11133                 if (port) {
11134                         ip6->ip6_nxt = IPPROTO_UDP;
11135                 } else {
11136                         ip6->ip6_nxt = IPPROTO_SCTP;
11137                 }
11138                 ip6->ip6_src = dst_sin6->sin6_addr;
11139                 ip6->ip6_dst = src_sin6->sin6_addr;
11140                 len = sizeof(struct ip6_hdr);
11141                 shout = (struct sctphdr *)((caddr_t)ip6 + len);
11142                 break;
11143 #endif
11144         default:
11145                 len = 0;
11146                 shout = mtod(mout, struct sctphdr *);
11147                 break;
11148         }
11149 #if defined(INET) || defined(INET6)
11150         if (port) {
11151                 if (htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port)) == 0) {
11152                         sctp_m_freem(mout);
11153                         return;
11154                 }
11155                 udp = (struct udphdr *)shout;
11156                 udp->uh_sport = htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port));
11157                 udp->uh_dport = port;
11158                 udp->uh_sum = 0;
11159                 udp->uh_ulen = htons((uint16_t)(sizeof(struct udphdr) +
11160                     sizeof(struct sctphdr) +
11161                     sizeof(struct sctp_chunkhdr) +
11162                     cause_len + padding_len));
11163                 len += sizeof(struct udphdr);
11164                 shout = (struct sctphdr *)((caddr_t)shout + sizeof(struct udphdr));
11165         } else {
11166                 udp = NULL;
11167         }
11168 #endif
11169         shout->src_port = sh->dest_port;
11170         shout->dest_port = sh->src_port;
11171         shout->checksum = 0;
11172         if (vtag) {
11173                 shout->v_tag = htonl(vtag);
11174         } else {
11175                 shout->v_tag = sh->v_tag;
11176         }
11177         len += sizeof(struct sctphdr);
11178         ch = (struct sctp_chunkhdr *)((caddr_t)shout + sizeof(struct sctphdr));
11179         ch->chunk_type = type;
11180         if (vtag) {
11181                 ch->chunk_flags = 0;
11182         } else {
11183                 ch->chunk_flags = SCTP_HAD_NO_TCB;
11184         }
11185         ch->chunk_length = htons((uint16_t)(sizeof(struct sctp_chunkhdr) + cause_len));
11186         len += sizeof(struct sctp_chunkhdr);
11187         len += cause_len + padding_len;
11188
11189         if (SCTP_GET_HEADER_FOR_OUTPUT(o_pak)) {
11190                 sctp_m_freem(mout);
11191                 return;
11192         }
11193         SCTP_ATTACH_CHAIN(o_pak, mout, len);
11194         switch (dst->sa_family) {
11195 #ifdef INET
11196         case AF_INET:
11197                 if (port) {
11198                         if (V_udp_cksum) {
11199                                 udp->uh_sum = in_pseudo(ip->ip_src.s_addr, ip->ip_dst.s_addr, udp->uh_ulen + htons(IPPROTO_UDP));
11200                         } else {
11201                                 udp->uh_sum = 0;
11202                         }
11203                 }
11204                 ip->ip_len = htons(len);
11205                 if (port) {
11206                         shout->checksum = sctp_calculate_cksum(mout, sizeof(struct ip) + sizeof(struct udphdr));
11207                         SCTP_STAT_INCR(sctps_sendswcrc);
11208                         if (V_udp_cksum) {
11209                                 SCTP_ENABLE_UDP_CSUM(o_pak);
11210                         }
11211                 } else {
11212                         mout->m_pkthdr.csum_flags = CSUM_SCTP;
11213                         mout->m_pkthdr.csum_data = offsetof(struct sctphdr, checksum);
11214                         SCTP_STAT_INCR(sctps_sendhwcrc);
11215                 }
11216 #ifdef SCTP_PACKET_LOGGING
11217                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING) {
11218                         sctp_packet_log(o_pak);
11219                 }
11220 #endif
11221                 SCTP_PROBE5(send, NULL, NULL, ip, NULL, shout);
11222                 SCTP_IP_OUTPUT(ret, o_pak, NULL, NULL, vrf_id);
11223                 break;
11224 #endif
11225 #ifdef INET6
11226         case AF_INET6:
11227                 ip6->ip6_plen = htons((uint16_t)(len - sizeof(struct ip6_hdr)));
11228                 if (port) {
11229                         shout->checksum = sctp_calculate_cksum(mout, sizeof(struct ip6_hdr) + sizeof(struct udphdr));
11230                         SCTP_STAT_INCR(sctps_sendswcrc);
11231                         if ((udp->uh_sum = in6_cksum(o_pak, IPPROTO_UDP, sizeof(struct ip6_hdr), len - sizeof(struct ip6_hdr))) == 0) {
11232                                 udp->uh_sum = 0xffff;
11233                         }
11234                 } else {
11235                         mout->m_pkthdr.csum_flags = CSUM_SCTP_IPV6;
11236                         mout->m_pkthdr.csum_data = offsetof(struct sctphdr, checksum);
11237                         SCTP_STAT_INCR(sctps_sendhwcrc);
11238                 }
11239 #ifdef SCTP_PACKET_LOGGING
11240                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING) {
11241                         sctp_packet_log(o_pak);
11242                 }
11243 #endif
11244                 SCTP_PROBE5(send, NULL, NULL, ip6, NULL, shout);
11245                 SCTP_IP6_OUTPUT(ret, o_pak, NULL, NULL, NULL, vrf_id);
11246                 break;
11247 #endif
11248         default:
11249                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Unknown protocol (TSNH) type %d\n",
11250                     dst->sa_family);
11251                 sctp_m_freem(mout);
11252                 SCTP_LTRACE_ERR_RET_PKT(mout, NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EFAULT);
11253                 return;
11254         }
11255         SCTPDBG(SCTP_DEBUG_OUTPUT3, "return from send is %d\n", ret);
11256         if (port) {
11257                 UDPSTAT_INC(udps_opackets);
11258         }
11259         SCTP_STAT_INCR(sctps_sendpackets);
11260         SCTP_STAT_INCR_COUNTER64(sctps_outpackets);
11261         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
11262         if (ret) {
11263                 SCTP_STAT_INCR(sctps_senderrors);
11264         }
11265         return;
11266 }
11267
11268 void
11269 sctp_send_shutdown_complete2(struct sockaddr *src, struct sockaddr *dst,
11270     struct sctphdr *sh,
11271     uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum,
11272     uint32_t vrf_id, uint16_t port)
11273 {
11274         sctp_send_resp_msg(src, dst, sh, 0, SCTP_SHUTDOWN_COMPLETE, NULL,
11275             mflowtype, mflowid, fibnum,
11276             vrf_id, port);
11277 }
11278
11279 void
11280 sctp_send_hb(struct sctp_tcb *stcb, struct sctp_nets *net, int so_locked)
11281 {
11282         struct sctp_tmit_chunk *chk;
11283         struct sctp_heartbeat_chunk *hb;
11284         struct timeval now;
11285
11286         SCTP_TCB_LOCK_ASSERT(stcb);
11287         if (net == NULL) {
11288                 return;
11289         }
11290         (void)SCTP_GETTIME_TIMEVAL(&now);
11291         switch (net->ro._l_addr.sa.sa_family) {
11292 #ifdef INET
11293         case AF_INET:
11294                 break;
11295 #endif
11296 #ifdef INET6
11297         case AF_INET6:
11298                 break;
11299 #endif
11300         default:
11301                 return;
11302         }
11303         sctp_alloc_a_chunk(stcb, chk);
11304         if (chk == NULL) {
11305                 SCTPDBG(SCTP_DEBUG_OUTPUT4, "Gak, can't get a chunk for hb\n");
11306                 return;
11307         }
11308
11309         chk->copy_by_ref = 0;
11310         chk->rec.chunk_id.id = SCTP_HEARTBEAT_REQUEST;
11311         chk->rec.chunk_id.can_take_data = 1;
11312         chk->flags = 0;
11313         chk->asoc = &stcb->asoc;
11314         chk->send_size = sizeof(struct sctp_heartbeat_chunk);
11315
11316         chk->data = sctp_get_mbuf_for_msg(chk->send_size, 0, M_NOWAIT, 1, MT_HEADER);
11317         if (chk->data == NULL) {
11318                 sctp_free_a_chunk(stcb, chk, so_locked);
11319                 return;
11320         }
11321         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11322         SCTP_BUF_LEN(chk->data) = chk->send_size;
11323         chk->sent = SCTP_DATAGRAM_UNSENT;
11324         chk->snd_count = 0;
11325         chk->whoTo = net;
11326         atomic_add_int(&chk->whoTo->ref_count, 1);
11327         /* Now we have a mbuf that we can fill in with the details */
11328         hb = mtod(chk->data, struct sctp_heartbeat_chunk *);
11329         memset(hb, 0, sizeof(struct sctp_heartbeat_chunk));
11330         /* fill out chunk header */
11331         hb->ch.chunk_type = SCTP_HEARTBEAT_REQUEST;
11332         hb->ch.chunk_flags = 0;
11333         hb->ch.chunk_length = htons(chk->send_size);
11334         /* Fill out hb parameter */
11335         hb->heartbeat.hb_info.ph.param_type = htons(SCTP_HEARTBEAT_INFO);
11336         hb->heartbeat.hb_info.ph.param_length = htons(sizeof(struct sctp_heartbeat_info_param));
11337         hb->heartbeat.hb_info.time_value_1 = (uint32_t)now.tv_sec;
11338         hb->heartbeat.hb_info.time_value_2 = now.tv_usec;
11339         /* Did our user request this one, put it in */
11340         hb->heartbeat.hb_info.addr_family = (uint8_t)net->ro._l_addr.sa.sa_family;
11341         hb->heartbeat.hb_info.addr_len = net->ro._l_addr.sa.sa_len;
11342         if (net->dest_state & SCTP_ADDR_UNCONFIRMED) {
11343                 /*
11344                  * we only take from the entropy pool if the address is not
11345                  * confirmed.
11346                  */
11347                 net->heartbeat_random1 = hb->heartbeat.hb_info.random_value1 = sctp_select_initial_TSN(&stcb->sctp_ep->sctp_ep);
11348                 net->heartbeat_random2 = hb->heartbeat.hb_info.random_value2 = sctp_select_initial_TSN(&stcb->sctp_ep->sctp_ep);
11349         } else {
11350                 net->heartbeat_random1 = hb->heartbeat.hb_info.random_value1 = 0;
11351                 net->heartbeat_random2 = hb->heartbeat.hb_info.random_value2 = 0;
11352         }
11353         switch (net->ro._l_addr.sa.sa_family) {
11354 #ifdef INET
11355         case AF_INET:
11356                 memcpy(hb->heartbeat.hb_info.address,
11357                     &net->ro._l_addr.sin.sin_addr,
11358                     sizeof(net->ro._l_addr.sin.sin_addr));
11359                 break;
11360 #endif
11361 #ifdef INET6
11362         case AF_INET6:
11363                 memcpy(hb->heartbeat.hb_info.address,
11364                     &net->ro._l_addr.sin6.sin6_addr,
11365                     sizeof(net->ro._l_addr.sin6.sin6_addr));
11366                 break;
11367 #endif
11368         default:
11369                 if (chk->data) {
11370                         sctp_m_freem(chk->data);
11371                         chk->data = NULL;
11372                 }
11373                 sctp_free_a_chunk(stcb, chk, so_locked);
11374                 return;
11375                 break;
11376         }
11377         net->hb_responded = 0;
11378         TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
11379         stcb->asoc.ctrl_queue_cnt++;
11380         SCTP_STAT_INCR(sctps_sendheartbeat);
11381         return;
11382 }
11383
11384 void
11385 sctp_send_ecn_echo(struct sctp_tcb *stcb, struct sctp_nets *net,
11386     uint32_t high_tsn)
11387 {
11388         struct sctp_association *asoc;
11389         struct sctp_ecne_chunk *ecne;
11390         struct sctp_tmit_chunk *chk;
11391
11392         if (net == NULL) {
11393                 return;
11394         }
11395         asoc = &stcb->asoc;
11396         SCTP_TCB_LOCK_ASSERT(stcb);
11397         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
11398                 if ((chk->rec.chunk_id.id == SCTP_ECN_ECHO) && (net == chk->whoTo)) {
11399                         /* found a previous ECN_ECHO update it if needed */
11400                         uint32_t cnt, ctsn;
11401
11402                         ecne = mtod(chk->data, struct sctp_ecne_chunk *);
11403                         ctsn = ntohl(ecne->tsn);
11404                         if (SCTP_TSN_GT(high_tsn, ctsn)) {
11405                                 ecne->tsn = htonl(high_tsn);
11406                                 SCTP_STAT_INCR(sctps_queue_upd_ecne);
11407                         }
11408                         cnt = ntohl(ecne->num_pkts_since_cwr);
11409                         cnt++;
11410                         ecne->num_pkts_since_cwr = htonl(cnt);
11411                         return;
11412                 }
11413         }
11414         /* nope could not find one to update so we must build one */
11415         sctp_alloc_a_chunk(stcb, chk);
11416         if (chk == NULL) {
11417                 return;
11418         }
11419         SCTP_STAT_INCR(sctps_queue_upd_ecne);
11420         chk->copy_by_ref = 0;
11421         chk->rec.chunk_id.id = SCTP_ECN_ECHO;
11422         chk->rec.chunk_id.can_take_data = 0;
11423         chk->flags = 0;
11424         chk->asoc = &stcb->asoc;
11425         chk->send_size = sizeof(struct sctp_ecne_chunk);
11426         chk->data = sctp_get_mbuf_for_msg(chk->send_size, 0, M_NOWAIT, 1, MT_HEADER);
11427         if (chk->data == NULL) {
11428                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
11429                 return;
11430         }
11431         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11432         SCTP_BUF_LEN(chk->data) = chk->send_size;
11433         chk->sent = SCTP_DATAGRAM_UNSENT;
11434         chk->snd_count = 0;
11435         chk->whoTo = net;
11436         atomic_add_int(&chk->whoTo->ref_count, 1);
11437
11438         stcb->asoc.ecn_echo_cnt_onq++;
11439         ecne = mtod(chk->data, struct sctp_ecne_chunk *);
11440         ecne->ch.chunk_type = SCTP_ECN_ECHO;
11441         ecne->ch.chunk_flags = 0;
11442         ecne->ch.chunk_length = htons(sizeof(struct sctp_ecne_chunk));
11443         ecne->tsn = htonl(high_tsn);
11444         ecne->num_pkts_since_cwr = htonl(1);
11445         TAILQ_INSERT_HEAD(&stcb->asoc.control_send_queue, chk, sctp_next);
11446         asoc->ctrl_queue_cnt++;
11447 }
11448
11449 void
11450 sctp_send_packet_dropped(struct sctp_tcb *stcb, struct sctp_nets *net,
11451     struct mbuf *m, int len, int iphlen, int bad_crc)
11452 {
11453         struct sctp_association *asoc;
11454         struct sctp_pktdrop_chunk *drp;
11455         struct sctp_tmit_chunk *chk;
11456         uint8_t *datap;
11457         int was_trunc = 0;
11458         int fullsz = 0;
11459         long spc;
11460         int offset;
11461         struct sctp_chunkhdr *ch, chunk_buf;
11462         unsigned int chk_length;
11463
11464         if (!stcb) {
11465                 return;
11466         }
11467         asoc = &stcb->asoc;
11468         SCTP_TCB_LOCK_ASSERT(stcb);
11469         if (asoc->pktdrop_supported == 0) {
11470                 /*-
11471                  * peer must declare support before I send one.
11472                  */
11473                 return;
11474         }
11475         if (stcb->sctp_socket == NULL) {
11476                 return;
11477         }
11478         sctp_alloc_a_chunk(stcb, chk);
11479         if (chk == NULL) {
11480                 return;
11481         }
11482         chk->copy_by_ref = 0;
11483         chk->rec.chunk_id.id = SCTP_PACKET_DROPPED;
11484         chk->rec.chunk_id.can_take_data = 1;
11485         chk->flags = 0;
11486         len -= iphlen;
11487         chk->send_size = len;
11488         /* Validate that we do not have an ABORT in here. */
11489         offset = iphlen + sizeof(struct sctphdr);
11490         ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, offset,
11491             sizeof(*ch), (uint8_t *)&chunk_buf);
11492         while (ch != NULL) {
11493                 chk_length = ntohs(ch->chunk_length);
11494                 if (chk_length < sizeof(*ch)) {
11495                         /* break to abort land */
11496                         break;
11497                 }
11498                 switch (ch->chunk_type) {
11499                 case SCTP_PACKET_DROPPED:
11500                 case SCTP_ABORT_ASSOCIATION:
11501                 case SCTP_INITIATION_ACK:
11502                         /**
11503                          * We don't respond with an PKT-DROP to an ABORT
11504                          * or PKT-DROP. We also do not respond to an
11505                          * INIT-ACK, because we can't know if the initiation
11506                          * tag is correct or not.
11507                          */
11508                         sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
11509                         return;
11510                 default:
11511                         break;
11512                 }
11513                 offset += SCTP_SIZE32(chk_length);
11514                 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, offset,
11515                     sizeof(*ch), (uint8_t *)&chunk_buf);
11516         }
11517
11518         if ((len + SCTP_MAX_OVERHEAD + sizeof(struct sctp_pktdrop_chunk)) >
11519             min(stcb->asoc.smallest_mtu, MCLBYTES)) {
11520                 /*
11521                  * only send 1 mtu worth, trim off the excess on the end.
11522                  */
11523                 fullsz = len;
11524                 len = min(stcb->asoc.smallest_mtu, MCLBYTES) - SCTP_MAX_OVERHEAD;
11525                 was_trunc = 1;
11526         }
11527         chk->asoc = &stcb->asoc;
11528         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
11529         if (chk->data == NULL) {
11530 jump_out:
11531                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
11532                 return;
11533         }
11534         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11535         drp = mtod(chk->data, struct sctp_pktdrop_chunk *);
11536         if (drp == NULL) {
11537                 sctp_m_freem(chk->data);
11538                 chk->data = NULL;
11539                 goto jump_out;
11540         }
11541         chk->book_size = SCTP_SIZE32((chk->send_size + sizeof(struct sctp_pktdrop_chunk) +
11542             sizeof(struct sctphdr) + SCTP_MED_OVERHEAD));
11543         chk->book_size_scale = 0;
11544         if (was_trunc) {
11545                 drp->ch.chunk_flags = SCTP_PACKET_TRUNCATED;
11546                 drp->trunc_len = htons(fullsz);
11547                 /*
11548                  * Len is already adjusted to size minus overhead above take
11549                  * out the pkt_drop chunk itself from it.
11550                  */
11551                 chk->send_size = (uint16_t)(len - sizeof(struct sctp_pktdrop_chunk));
11552                 len = chk->send_size;
11553         } else {
11554                 /* no truncation needed */
11555                 drp->ch.chunk_flags = 0;
11556                 drp->trunc_len = htons(0);
11557         }
11558         if (bad_crc) {
11559                 drp->ch.chunk_flags |= SCTP_BADCRC;
11560         }
11561         chk->send_size += sizeof(struct sctp_pktdrop_chunk);
11562         SCTP_BUF_LEN(chk->data) = chk->send_size;
11563         chk->sent = SCTP_DATAGRAM_UNSENT;
11564         chk->snd_count = 0;
11565         if (net) {
11566                 /* we should hit here */
11567                 chk->whoTo = net;
11568                 atomic_add_int(&chk->whoTo->ref_count, 1);
11569         } else {
11570                 chk->whoTo = NULL;
11571         }
11572         drp->ch.chunk_type = SCTP_PACKET_DROPPED;
11573         drp->ch.chunk_length = htons(chk->send_size);
11574         spc = SCTP_SB_LIMIT_RCV(stcb->sctp_socket);
11575         if (spc < 0) {
11576                 spc = 0;
11577         }
11578         drp->bottle_bw = htonl(spc);
11579         if (asoc->my_rwnd) {
11580                 drp->current_onq = htonl(asoc->size_on_reasm_queue +
11581                     asoc->size_on_all_streams +
11582                     asoc->my_rwnd_control_len +
11583                     stcb->sctp_socket->so_rcv.sb_cc);
11584         } else {
11585                 /*-
11586                  * If my rwnd is 0, possibly from mbuf depletion as well as
11587                  * space used, tell the peer there is NO space aka onq == bw
11588                  */
11589                 drp->current_onq = htonl(spc);
11590         }
11591         drp->reserved = 0;
11592         datap = drp->data;
11593         m_copydata(m, iphlen, len, (caddr_t)datap);
11594         TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
11595         asoc->ctrl_queue_cnt++;
11596 }
11597
11598 void
11599 sctp_send_cwr(struct sctp_tcb *stcb, struct sctp_nets *net, uint32_t high_tsn, uint8_t override)
11600 {
11601         struct sctp_association *asoc;
11602         struct sctp_cwr_chunk *cwr;
11603         struct sctp_tmit_chunk *chk;
11604
11605         SCTP_TCB_LOCK_ASSERT(stcb);
11606         if (net == NULL) {
11607                 return;
11608         }
11609         asoc = &stcb->asoc;
11610         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
11611                 if ((chk->rec.chunk_id.id == SCTP_ECN_CWR) && (net == chk->whoTo)) {
11612                         /*
11613                          * found a previous CWR queued to same destination
11614                          * update it if needed
11615                          */
11616                         uint32_t ctsn;
11617
11618                         cwr = mtod(chk->data, struct sctp_cwr_chunk *);
11619                         ctsn = ntohl(cwr->tsn);
11620                         if (SCTP_TSN_GT(high_tsn, ctsn)) {
11621                                 cwr->tsn = htonl(high_tsn);
11622                         }
11623                         if (override & SCTP_CWR_REDUCE_OVERRIDE) {
11624                                 /* Make sure override is carried */
11625                                 cwr->ch.chunk_flags |= SCTP_CWR_REDUCE_OVERRIDE;
11626                         }
11627                         return;
11628                 }
11629         }
11630         sctp_alloc_a_chunk(stcb, chk);
11631         if (chk == NULL) {
11632                 return;
11633         }
11634         chk->copy_by_ref = 0;
11635         chk->rec.chunk_id.id = SCTP_ECN_CWR;
11636         chk->rec.chunk_id.can_take_data = 1;
11637         chk->flags = 0;
11638         chk->asoc = &stcb->asoc;
11639         chk->send_size = sizeof(struct sctp_cwr_chunk);
11640         chk->data = sctp_get_mbuf_for_msg(chk->send_size, 0, M_NOWAIT, 1, MT_HEADER);
11641         if (chk->data == NULL) {
11642                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
11643                 return;
11644         }
11645         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11646         SCTP_BUF_LEN(chk->data) = chk->send_size;
11647         chk->sent = SCTP_DATAGRAM_UNSENT;
11648         chk->snd_count = 0;
11649         chk->whoTo = net;
11650         atomic_add_int(&chk->whoTo->ref_count, 1);
11651         cwr = mtod(chk->data, struct sctp_cwr_chunk *);
11652         cwr->ch.chunk_type = SCTP_ECN_CWR;
11653         cwr->ch.chunk_flags = override;
11654         cwr->ch.chunk_length = htons(sizeof(struct sctp_cwr_chunk));
11655         cwr->tsn = htonl(high_tsn);
11656         TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
11657         asoc->ctrl_queue_cnt++;
11658 }
11659
11660 static int
11661 sctp_add_stream_reset_out(struct sctp_tcb *stcb, struct sctp_tmit_chunk *chk,
11662     uint32_t seq, uint32_t resp_seq, uint32_t last_sent)
11663 {
11664         uint16_t len, old_len, i;
11665         struct sctp_stream_reset_out_request *req_out;
11666         struct sctp_chunkhdr *ch;
11667         int at;
11668         int number_entries = 0;
11669
11670         ch = mtod(chk->data, struct sctp_chunkhdr *);
11671         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11672         /* get to new offset for the param. */
11673         req_out = (struct sctp_stream_reset_out_request *)((caddr_t)ch + len);
11674         /* now how long will this param be? */
11675         for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
11676                 if ((stcb->asoc.strmout[i].state == SCTP_STREAM_RESET_PENDING) &&
11677                     (stcb->asoc.strmout[i].chunks_on_queues == 0) &&
11678                     TAILQ_EMPTY(&stcb->asoc.strmout[i].outqueue)) {
11679                         number_entries++;
11680                 }
11681         }
11682         if (number_entries == 0) {
11683                 return (0);
11684         }
11685         if (number_entries == stcb->asoc.streamoutcnt) {
11686                 number_entries = 0;
11687         }
11688         if (number_entries > SCTP_MAX_STREAMS_AT_ONCE_RESET) {
11689                 number_entries = SCTP_MAX_STREAMS_AT_ONCE_RESET;
11690         }
11691         len = (uint16_t)(sizeof(struct sctp_stream_reset_out_request) + (sizeof(uint16_t) * number_entries));
11692         req_out->ph.param_type = htons(SCTP_STR_RESET_OUT_REQUEST);
11693         req_out->ph.param_length = htons(len);
11694         req_out->request_seq = htonl(seq);
11695         req_out->response_seq = htonl(resp_seq);
11696         req_out->send_reset_at_tsn = htonl(last_sent);
11697         at = 0;
11698         if (number_entries) {
11699                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
11700                         if ((stcb->asoc.strmout[i].state == SCTP_STREAM_RESET_PENDING) &&
11701                             (stcb->asoc.strmout[i].chunks_on_queues == 0) &&
11702                             TAILQ_EMPTY(&stcb->asoc.strmout[i].outqueue)) {
11703                                 req_out->list_of_streams[at] = htons(i);
11704                                 at++;
11705                                 stcb->asoc.strmout[i].state = SCTP_STREAM_RESET_IN_FLIGHT;
11706                                 if (at >= number_entries) {
11707                                         break;
11708                                 }
11709                         }
11710                 }
11711         } else {
11712                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
11713                         stcb->asoc.strmout[i].state = SCTP_STREAM_RESET_IN_FLIGHT;
11714                 }
11715         }
11716         if (SCTP_SIZE32(len) > len) {
11717                 /*-
11718                  * Need to worry about the pad we may end up adding to the
11719                  * end. This is easy since the struct is either aligned to 4
11720                  * bytes or 2 bytes off.
11721                  */
11722                 req_out->list_of_streams[number_entries] = 0;
11723         }
11724         /* now fix the chunk length */
11725         ch->chunk_length = htons(len + old_len);
11726         chk->book_size = len + old_len;
11727         chk->book_size_scale = 0;
11728         chk->send_size = SCTP_SIZE32(chk->book_size);
11729         SCTP_BUF_LEN(chk->data) = chk->send_size;
11730         return (1);
11731 }
11732
11733 static void
11734 sctp_add_stream_reset_in(struct sctp_tmit_chunk *chk,
11735     int number_entries, uint16_t *list,
11736     uint32_t seq)
11737 {
11738         uint16_t len, old_len, i;
11739         struct sctp_stream_reset_in_request *req_in;
11740         struct sctp_chunkhdr *ch;
11741
11742         ch = mtod(chk->data, struct sctp_chunkhdr *);
11743         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11744
11745         /* get to new offset for the param. */
11746         req_in = (struct sctp_stream_reset_in_request *)((caddr_t)ch + len);
11747         /* now how long will this param be? */
11748         len = (uint16_t)(sizeof(struct sctp_stream_reset_in_request) + (sizeof(uint16_t) * number_entries));
11749         req_in->ph.param_type = htons(SCTP_STR_RESET_IN_REQUEST);
11750         req_in->ph.param_length = htons(len);
11751         req_in->request_seq = htonl(seq);
11752         if (number_entries) {
11753                 for (i = 0; i < number_entries; i++) {
11754                         req_in->list_of_streams[i] = htons(list[i]);
11755                 }
11756         }
11757         if (SCTP_SIZE32(len) > len) {
11758                 /*-
11759                  * Need to worry about the pad we may end up adding to the
11760                  * end. This is easy since the struct is either aligned to 4
11761                  * bytes or 2 bytes off.
11762                  */
11763                 req_in->list_of_streams[number_entries] = 0;
11764         }
11765         /* now fix the chunk length */
11766         ch->chunk_length = htons(len + old_len);
11767         chk->book_size = len + old_len;
11768         chk->book_size_scale = 0;
11769         chk->send_size = SCTP_SIZE32(chk->book_size);
11770         SCTP_BUF_LEN(chk->data) = chk->send_size;
11771         return;
11772 }
11773
11774 static void
11775 sctp_add_stream_reset_tsn(struct sctp_tmit_chunk *chk,
11776     uint32_t seq)
11777 {
11778         uint16_t len, old_len;
11779         struct sctp_stream_reset_tsn_request *req_tsn;
11780         struct sctp_chunkhdr *ch;
11781
11782         ch = mtod(chk->data, struct sctp_chunkhdr *);
11783         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11784
11785         /* get to new offset for the param. */
11786         req_tsn = (struct sctp_stream_reset_tsn_request *)((caddr_t)ch + len);
11787         /* now how long will this param be? */
11788         len = sizeof(struct sctp_stream_reset_tsn_request);
11789         req_tsn->ph.param_type = htons(SCTP_STR_RESET_TSN_REQUEST);
11790         req_tsn->ph.param_length = htons(len);
11791         req_tsn->request_seq = htonl(seq);
11792
11793         /* now fix the chunk length */
11794         ch->chunk_length = htons(len + old_len);
11795         chk->send_size = len + old_len;
11796         chk->book_size = SCTP_SIZE32(chk->send_size);
11797         chk->book_size_scale = 0;
11798         SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size);
11799         return;
11800 }
11801
11802 void
11803 sctp_add_stream_reset_result(struct sctp_tmit_chunk *chk,
11804     uint32_t resp_seq, uint32_t result)
11805 {
11806         uint16_t len, old_len;
11807         struct sctp_stream_reset_response *resp;
11808         struct sctp_chunkhdr *ch;
11809
11810         ch = mtod(chk->data, struct sctp_chunkhdr *);
11811         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11812
11813         /* get to new offset for the param. */
11814         resp = (struct sctp_stream_reset_response *)((caddr_t)ch + len);
11815         /* now how long will this param be? */
11816         len = sizeof(struct sctp_stream_reset_response);
11817         resp->ph.param_type = htons(SCTP_STR_RESET_RESPONSE);
11818         resp->ph.param_length = htons(len);
11819         resp->response_seq = htonl(resp_seq);
11820         resp->result = ntohl(result);
11821
11822         /* now fix the chunk length */
11823         ch->chunk_length = htons(len + old_len);
11824         chk->book_size = len + old_len;
11825         chk->book_size_scale = 0;
11826         chk->send_size = SCTP_SIZE32(chk->book_size);
11827         SCTP_BUF_LEN(chk->data) = chk->send_size;
11828         return;
11829 }
11830
11831 void
11832 sctp_send_deferred_reset_response(struct sctp_tcb *stcb,
11833     struct sctp_stream_reset_list *ent,
11834     int response)
11835 {
11836         struct sctp_association *asoc;
11837         struct sctp_tmit_chunk *chk;
11838         struct sctp_chunkhdr *ch;
11839
11840         asoc = &stcb->asoc;
11841
11842         /*
11843          * Reset our last reset action to the new one IP -> response
11844          * (PERFORMED probably). This assures that if we fail to send, a
11845          * retran from the peer will get the new response.
11846          */
11847         asoc->last_reset_action[0] = response;
11848         if (asoc->stream_reset_outstanding) {
11849                 return;
11850         }
11851         sctp_alloc_a_chunk(stcb, chk);
11852         if (chk == NULL) {
11853                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
11854                 return;
11855         }
11856         chk->copy_by_ref = 0;
11857         chk->rec.chunk_id.id = SCTP_STREAM_RESET;
11858         chk->rec.chunk_id.can_take_data = 0;
11859         chk->flags = 0;
11860         chk->asoc = &stcb->asoc;
11861         chk->book_size = sizeof(struct sctp_chunkhdr);
11862         chk->send_size = SCTP_SIZE32(chk->book_size);
11863         chk->book_size_scale = 0;
11864         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
11865         if (chk->data == NULL) {
11866                 sctp_free_a_chunk(stcb, chk, SCTP_SO_LOCKED);
11867                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
11868                 return;
11869         }
11870         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11871         /* setup chunk parameters */
11872         chk->sent = SCTP_DATAGRAM_UNSENT;
11873         chk->snd_count = 0;
11874         if (stcb->asoc.alternate) {
11875                 chk->whoTo = stcb->asoc.alternate;
11876         } else {
11877                 chk->whoTo = stcb->asoc.primary_destination;
11878         }
11879         ch = mtod(chk->data, struct sctp_chunkhdr *);
11880         ch->chunk_type = SCTP_STREAM_RESET;
11881         ch->chunk_flags = 0;
11882         ch->chunk_length = htons(chk->book_size);
11883         atomic_add_int(&chk->whoTo->ref_count, 1);
11884         SCTP_BUF_LEN(chk->data) = chk->send_size;
11885         sctp_add_stream_reset_result(chk, ent->seq, response);
11886         /* insert the chunk for sending */
11887         TAILQ_INSERT_TAIL(&asoc->control_send_queue,
11888             chk,
11889             sctp_next);
11890         asoc->ctrl_queue_cnt++;
11891 }
11892
11893 void
11894 sctp_add_stream_reset_result_tsn(struct sctp_tmit_chunk *chk,
11895     uint32_t resp_seq, uint32_t result,
11896     uint32_t send_una, uint32_t recv_next)
11897 {
11898         uint16_t len, old_len;
11899         struct sctp_stream_reset_response_tsn *resp;
11900         struct sctp_chunkhdr *ch;
11901
11902         ch = mtod(chk->data, struct sctp_chunkhdr *);
11903         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11904
11905         /* get to new offset for the param. */
11906         resp = (struct sctp_stream_reset_response_tsn *)((caddr_t)ch + len);
11907         /* now how long will this param be? */
11908         len = sizeof(struct sctp_stream_reset_response_tsn);
11909         resp->ph.param_type = htons(SCTP_STR_RESET_RESPONSE);
11910         resp->ph.param_length = htons(len);
11911         resp->response_seq = htonl(resp_seq);
11912         resp->result = htonl(result);
11913         resp->senders_next_tsn = htonl(send_una);
11914         resp->receivers_next_tsn = htonl(recv_next);
11915
11916         /* now fix the chunk length */
11917         ch->chunk_length = htons(len + old_len);
11918         chk->book_size = len + old_len;
11919         chk->send_size = SCTP_SIZE32(chk->book_size);
11920         chk->book_size_scale = 0;
11921         SCTP_BUF_LEN(chk->data) = chk->send_size;
11922         return;
11923 }
11924
11925 static void
11926 sctp_add_an_out_stream(struct sctp_tmit_chunk *chk,
11927     uint32_t seq,
11928     uint16_t adding)
11929 {
11930         uint16_t len, old_len;
11931         struct sctp_chunkhdr *ch;
11932         struct sctp_stream_reset_add_strm *addstr;
11933
11934         ch = mtod(chk->data, struct sctp_chunkhdr *);
11935         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11936
11937         /* get to new offset for the param. */
11938         addstr = (struct sctp_stream_reset_add_strm *)((caddr_t)ch + len);
11939         /* now how long will this param be? */
11940         len = sizeof(struct sctp_stream_reset_add_strm);
11941
11942         /* Fill it out. */
11943         addstr->ph.param_type = htons(SCTP_STR_RESET_ADD_OUT_STREAMS);
11944         addstr->ph.param_length = htons(len);
11945         addstr->request_seq = htonl(seq);
11946         addstr->number_of_streams = htons(adding);
11947         addstr->reserved = 0;
11948
11949         /* now fix the chunk length */
11950         ch->chunk_length = htons(len + old_len);
11951         chk->send_size = len + old_len;
11952         chk->book_size = SCTP_SIZE32(chk->send_size);
11953         chk->book_size_scale = 0;
11954         SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size);
11955         return;
11956 }
11957
11958 static void
11959 sctp_add_an_in_stream(struct sctp_tmit_chunk *chk,
11960     uint32_t seq,
11961     uint16_t adding)
11962 {
11963         uint16_t len, old_len;
11964         struct sctp_chunkhdr *ch;
11965         struct sctp_stream_reset_add_strm *addstr;
11966
11967         ch = mtod(chk->data, struct sctp_chunkhdr *);
11968         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11969
11970         /* get to new offset for the param. */
11971         addstr = (struct sctp_stream_reset_add_strm *)((caddr_t)ch + len);
11972         /* now how long will this param be? */
11973         len = sizeof(struct sctp_stream_reset_add_strm);
11974         /* Fill it out. */
11975         addstr->ph.param_type = htons(SCTP_STR_RESET_ADD_IN_STREAMS);
11976         addstr->ph.param_length = htons(len);
11977         addstr->request_seq = htonl(seq);
11978         addstr->number_of_streams = htons(adding);
11979         addstr->reserved = 0;
11980
11981         /* now fix the chunk length */
11982         ch->chunk_length = htons(len + old_len);
11983         chk->send_size = len + old_len;
11984         chk->book_size = SCTP_SIZE32(chk->send_size);
11985         chk->book_size_scale = 0;
11986         SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size);
11987         return;
11988 }
11989
11990 int
11991 sctp_send_stream_reset_out_if_possible(struct sctp_tcb *stcb, int so_locked)
11992 {
11993         struct sctp_association *asoc;
11994         struct sctp_tmit_chunk *chk;
11995         struct sctp_chunkhdr *ch;
11996         uint32_t seq;
11997
11998         asoc = &stcb->asoc;
11999         asoc->trigger_reset = 0;
12000         if (asoc->stream_reset_outstanding) {
12001                 return (EALREADY);
12002         }
12003         sctp_alloc_a_chunk(stcb, chk);
12004         if (chk == NULL) {
12005                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12006                 return (ENOMEM);
12007         }
12008         chk->copy_by_ref = 0;
12009         chk->rec.chunk_id.id = SCTP_STREAM_RESET;
12010         chk->rec.chunk_id.can_take_data = 0;
12011         chk->flags = 0;
12012         chk->asoc = &stcb->asoc;
12013         chk->book_size = sizeof(struct sctp_chunkhdr);
12014         chk->send_size = SCTP_SIZE32(chk->book_size);
12015         chk->book_size_scale = 0;
12016         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
12017         if (chk->data == NULL) {
12018                 sctp_free_a_chunk(stcb, chk, so_locked);
12019                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12020                 return (ENOMEM);
12021         }
12022         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
12023
12024         /* setup chunk parameters */
12025         chk->sent = SCTP_DATAGRAM_UNSENT;
12026         chk->snd_count = 0;
12027         if (stcb->asoc.alternate) {
12028                 chk->whoTo = stcb->asoc.alternate;
12029         } else {
12030                 chk->whoTo = stcb->asoc.primary_destination;
12031         }
12032         ch = mtod(chk->data, struct sctp_chunkhdr *);
12033         ch->chunk_type = SCTP_STREAM_RESET;
12034         ch->chunk_flags = 0;
12035         ch->chunk_length = htons(chk->book_size);
12036         atomic_add_int(&chk->whoTo->ref_count, 1);
12037         SCTP_BUF_LEN(chk->data) = chk->send_size;
12038         seq = stcb->asoc.str_reset_seq_out;
12039         if (sctp_add_stream_reset_out(stcb, chk, seq, (stcb->asoc.str_reset_seq_in - 1), (stcb->asoc.sending_seq - 1))) {
12040                 seq++;
12041                 asoc->stream_reset_outstanding++;
12042         } else {
12043                 m_freem(chk->data);
12044                 chk->data = NULL;
12045                 sctp_free_a_chunk(stcb, chk, so_locked);
12046                 return (ENOENT);
12047         }
12048         asoc->str_reset = chk;
12049         /* insert the chunk for sending */
12050         TAILQ_INSERT_TAIL(&asoc->control_send_queue,
12051             chk,
12052             sctp_next);
12053         asoc->ctrl_queue_cnt++;
12054
12055         if (stcb->asoc.send_sack) {
12056                 sctp_send_sack(stcb, so_locked);
12057         }
12058         sctp_timer_start(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb, chk->whoTo);
12059         return (0);
12060 }
12061
12062 int
12063 sctp_send_str_reset_req(struct sctp_tcb *stcb,
12064     uint16_t number_entries, uint16_t *list,
12065     uint8_t send_in_req,
12066     uint8_t send_tsn_req,
12067     uint8_t add_stream,
12068     uint16_t adding_o,
12069     uint16_t adding_i, uint8_t peer_asked)
12070 {
12071         struct sctp_association *asoc;
12072         struct sctp_tmit_chunk *chk;
12073         struct sctp_chunkhdr *ch;
12074         int can_send_out_req = 0;
12075         uint32_t seq;
12076
12077         asoc = &stcb->asoc;
12078         if (asoc->stream_reset_outstanding) {
12079                 /*-
12080                  * Already one pending, must get ACK back to clear the flag.
12081                  */
12082                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EBUSY);
12083                 return (EBUSY);
12084         }
12085         if ((send_in_req == 0) && (send_tsn_req == 0) &&
12086             (add_stream == 0)) {
12087                 /* nothing to do */
12088                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12089                 return (EINVAL);
12090         }
12091         if (send_tsn_req && send_in_req) {
12092                 /* error, can't do that */
12093                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12094                 return (EINVAL);
12095         } else if (send_in_req) {
12096                 can_send_out_req = 1;
12097         }
12098         if (number_entries > (MCLBYTES -
12099             SCTP_MIN_OVERHEAD -
12100             sizeof(struct sctp_chunkhdr) -
12101             sizeof(struct sctp_stream_reset_out_request)) /
12102             sizeof(uint16_t)) {
12103                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12104                 return (ENOMEM);
12105         }
12106         sctp_alloc_a_chunk(stcb, chk);
12107         if (chk == NULL) {
12108                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12109                 return (ENOMEM);
12110         }
12111         chk->copy_by_ref = 0;
12112         chk->rec.chunk_id.id = SCTP_STREAM_RESET;
12113         chk->rec.chunk_id.can_take_data = 0;
12114         chk->flags = 0;
12115         chk->asoc = &stcb->asoc;
12116         chk->book_size = sizeof(struct sctp_chunkhdr);
12117         chk->send_size = SCTP_SIZE32(chk->book_size);
12118         chk->book_size_scale = 0;
12119         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
12120         if (chk->data == NULL) {
12121                 sctp_free_a_chunk(stcb, chk, SCTP_SO_LOCKED);
12122                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12123                 return (ENOMEM);
12124         }
12125         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
12126
12127         /* setup chunk parameters */
12128         chk->sent = SCTP_DATAGRAM_UNSENT;
12129         chk->snd_count = 0;
12130         if (stcb->asoc.alternate) {
12131                 chk->whoTo = stcb->asoc.alternate;
12132         } else {
12133                 chk->whoTo = stcb->asoc.primary_destination;
12134         }
12135         atomic_add_int(&chk->whoTo->ref_count, 1);
12136         ch = mtod(chk->data, struct sctp_chunkhdr *);
12137         ch->chunk_type = SCTP_STREAM_RESET;
12138         ch->chunk_flags = 0;
12139         ch->chunk_length = htons(chk->book_size);
12140         SCTP_BUF_LEN(chk->data) = chk->send_size;
12141
12142         seq = stcb->asoc.str_reset_seq_out;
12143         if (can_send_out_req) {
12144                 int ret;
12145
12146                 ret = sctp_add_stream_reset_out(stcb, chk, seq, (stcb->asoc.str_reset_seq_in - 1), (stcb->asoc.sending_seq - 1));
12147                 if (ret) {
12148                         seq++;
12149                         asoc->stream_reset_outstanding++;
12150                 }
12151         }
12152         if ((add_stream & 1) &&
12153             ((stcb->asoc.strm_realoutsize - stcb->asoc.streamoutcnt) < adding_o)) {
12154                 /* Need to allocate more */
12155                 struct sctp_stream_out *oldstream;
12156                 struct sctp_stream_queue_pending *sp, *nsp;
12157                 int i;
12158 #if defined(SCTP_DETAILED_STR_STATS)
12159                 int j;
12160 #endif
12161
12162                 oldstream = stcb->asoc.strmout;
12163                 /* get some more */
12164                 SCTP_MALLOC(stcb->asoc.strmout, struct sctp_stream_out *,
12165                     (stcb->asoc.streamoutcnt + adding_o) * sizeof(struct sctp_stream_out),
12166                     SCTP_M_STRMO);
12167                 if (stcb->asoc.strmout == NULL) {
12168                         uint8_t x;
12169
12170                         stcb->asoc.strmout = oldstream;
12171                         /* Turn off the bit */
12172                         x = add_stream & 0xfe;
12173                         add_stream = x;
12174                         goto skip_stuff;
12175                 }
12176                 /*
12177                  * Ok now we proceed with copying the old out stuff and
12178                  * initializing the new stuff.
12179                  */
12180                 SCTP_TCB_SEND_LOCK(stcb);
12181                 stcb->asoc.ss_functions.sctp_ss_clear(stcb, &stcb->asoc, false);
12182                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
12183                         TAILQ_INIT(&stcb->asoc.strmout[i].outqueue);
12184                         /* FIX ME FIX ME */
12185                         /*
12186                          * This should be a SS_COPY operation FIX ME STREAM
12187                          * SCHEDULER EXPERT
12188                          */
12189                         stcb->asoc.ss_functions.sctp_ss_init_stream(stcb, &stcb->asoc.strmout[i], &oldstream[i]);
12190                         stcb->asoc.strmout[i].chunks_on_queues = oldstream[i].chunks_on_queues;
12191 #if defined(SCTP_DETAILED_STR_STATS)
12192                         for (j = 0; j < SCTP_PR_SCTP_MAX + 1; j++) {
12193                                 stcb->asoc.strmout[i].abandoned_sent[j] = oldstream[i].abandoned_sent[j];
12194                                 stcb->asoc.strmout[i].abandoned_unsent[j] = oldstream[i].abandoned_unsent[j];
12195                         }
12196 #else
12197                         stcb->asoc.strmout[i].abandoned_sent[0] = oldstream[i].abandoned_sent[0];
12198                         stcb->asoc.strmout[i].abandoned_unsent[0] = oldstream[i].abandoned_unsent[0];
12199 #endif
12200                         stcb->asoc.strmout[i].next_mid_ordered = oldstream[i].next_mid_ordered;
12201                         stcb->asoc.strmout[i].next_mid_unordered = oldstream[i].next_mid_unordered;
12202                         stcb->asoc.strmout[i].last_msg_incomplete = oldstream[i].last_msg_incomplete;
12203                         stcb->asoc.strmout[i].sid = i;
12204                         stcb->asoc.strmout[i].state = oldstream[i].state;
12205                         /* now anything on those queues? */
12206                         TAILQ_FOREACH_SAFE(sp, &oldstream[i].outqueue, next, nsp) {
12207                                 TAILQ_REMOVE(&oldstream[i].outqueue, sp, next);
12208                                 TAILQ_INSERT_TAIL(&stcb->asoc.strmout[i].outqueue, sp, next);
12209                         }
12210                 }
12211                 /* now the new streams */
12212                 stcb->asoc.ss_functions.sctp_ss_init(stcb, &stcb->asoc);
12213                 for (i = stcb->asoc.streamoutcnt; i < (stcb->asoc.streamoutcnt + adding_o); i++) {
12214                         TAILQ_INIT(&stcb->asoc.strmout[i].outqueue);
12215                         stcb->asoc.strmout[i].chunks_on_queues = 0;
12216 #if defined(SCTP_DETAILED_STR_STATS)
12217                         for (j = 0; j < SCTP_PR_SCTP_MAX + 1; j++) {
12218                                 stcb->asoc.strmout[i].abandoned_sent[j] = 0;
12219                                 stcb->asoc.strmout[i].abandoned_unsent[j] = 0;
12220                         }
12221 #else
12222                         stcb->asoc.strmout[i].abandoned_sent[0] = 0;
12223                         stcb->asoc.strmout[i].abandoned_unsent[0] = 0;
12224 #endif
12225                         stcb->asoc.strmout[i].next_mid_ordered = 0;
12226                         stcb->asoc.strmout[i].next_mid_unordered = 0;
12227                         stcb->asoc.strmout[i].sid = i;
12228                         stcb->asoc.strmout[i].last_msg_incomplete = 0;
12229                         stcb->asoc.ss_functions.sctp_ss_init_stream(stcb, &stcb->asoc.strmout[i], NULL);
12230                         stcb->asoc.strmout[i].state = SCTP_STREAM_CLOSED;
12231                 }
12232                 stcb->asoc.strm_realoutsize = stcb->asoc.streamoutcnt + adding_o;
12233                 SCTP_FREE(oldstream, SCTP_M_STRMO);
12234                 SCTP_TCB_SEND_UNLOCK(stcb);
12235         }
12236 skip_stuff:
12237         if ((add_stream & 1) && (adding_o > 0)) {
12238                 asoc->strm_pending_add_size = adding_o;
12239                 asoc->peer_req_out = peer_asked;
12240                 sctp_add_an_out_stream(chk, seq, adding_o);
12241                 seq++;
12242                 asoc->stream_reset_outstanding++;
12243         }
12244         if ((add_stream & 2) && (adding_i > 0)) {
12245                 sctp_add_an_in_stream(chk, seq, adding_i);
12246                 seq++;
12247                 asoc->stream_reset_outstanding++;
12248         }
12249         if (send_in_req) {
12250                 sctp_add_stream_reset_in(chk, number_entries, list, seq);
12251                 seq++;
12252                 asoc->stream_reset_outstanding++;
12253         }
12254         if (send_tsn_req) {
12255                 sctp_add_stream_reset_tsn(chk, seq);
12256                 asoc->stream_reset_outstanding++;
12257         }
12258         asoc->str_reset = chk;
12259         /* insert the chunk for sending */
12260         TAILQ_INSERT_TAIL(&asoc->control_send_queue,
12261             chk,
12262             sctp_next);
12263         asoc->ctrl_queue_cnt++;
12264         if (stcb->asoc.send_sack) {
12265                 sctp_send_sack(stcb, SCTP_SO_LOCKED);
12266         }
12267         sctp_timer_start(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb, chk->whoTo);
12268         return (0);
12269 }
12270
12271 void
12272 sctp_send_abort(struct mbuf *m, int iphlen, struct sockaddr *src, struct sockaddr *dst,
12273     struct sctphdr *sh, uint32_t vtag, struct mbuf *cause,
12274     uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum,
12275     uint32_t vrf_id, uint16_t port)
12276 {
12277         /* Don't respond to an ABORT with an ABORT. */
12278         if (sctp_is_there_an_abort_here(m, iphlen, &vtag)) {
12279                 if (cause)
12280                         sctp_m_freem(cause);
12281                 return;
12282         }
12283         sctp_send_resp_msg(src, dst, sh, vtag, SCTP_ABORT_ASSOCIATION, cause,
12284             mflowtype, mflowid, fibnum,
12285             vrf_id, port);
12286         return;
12287 }
12288
12289 void
12290 sctp_send_operr_to(struct sockaddr *src, struct sockaddr *dst,
12291     struct sctphdr *sh, uint32_t vtag, struct mbuf *cause,
12292     uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum,
12293     uint32_t vrf_id, uint16_t port)
12294 {
12295         sctp_send_resp_msg(src, dst, sh, vtag, SCTP_OPERATION_ERROR, cause,
12296             mflowtype, mflowid, fibnum,
12297             vrf_id, port);
12298         return;
12299 }
12300
12301 static struct mbuf *
12302 sctp_copy_resume(struct uio *uio,
12303     int max_send_len,
12304     int user_marks_eor,
12305     int *error,
12306     uint32_t *sndout,
12307     struct mbuf **new_tail)
12308 {
12309         struct mbuf *m;
12310
12311         m = m_uiotombuf(uio, M_WAITOK, max_send_len, 0,
12312             (M_PKTHDR | (user_marks_eor ? M_EOR : 0)));
12313         if (m == NULL) {
12314                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOBUFS);
12315                 *error = ENOBUFS;
12316         } else {
12317                 *sndout = m_length(m, NULL);
12318                 *new_tail = m_last(m);
12319         }
12320         return (m);
12321 }
12322
12323 static int
12324 sctp_copy_one(struct sctp_stream_queue_pending *sp,
12325     struct uio *uio,
12326     int resv_upfront)
12327 {
12328         sp->data = m_uiotombuf(uio, M_WAITOK, sp->length,
12329             resv_upfront, 0);
12330         if (sp->data == NULL) {
12331                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOBUFS);
12332                 return (ENOBUFS);
12333         }
12334
12335         sp->tail_mbuf = m_last(sp->data);
12336         return (0);
12337 }
12338
12339 static struct sctp_stream_queue_pending *
12340 sctp_copy_it_in(struct sctp_tcb *stcb,
12341     struct sctp_association *asoc,
12342     struct sctp_sndrcvinfo *srcv,
12343     struct uio *uio,
12344     struct sctp_nets *net,
12345     ssize_t max_send_len,
12346     int user_marks_eor,
12347     int *error)
12348 {
12349
12350         /*-
12351          * This routine must be very careful in its work. Protocol
12352          * processing is up and running so care must be taken to spl...()
12353          * when you need to do something that may effect the stcb/asoc. The
12354          * sb is locked however. When data is copied the protocol processing
12355          * should be enabled since this is a slower operation...
12356          */
12357         struct sctp_stream_queue_pending *sp = NULL;
12358         int resv_in_first;
12359
12360         *error = 0;
12361         /* Now can we send this? */
12362         if ((SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_SENT) ||
12363             (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_ACK_SENT) ||
12364             (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_RECEIVED) ||
12365             (asoc->state & SCTP_STATE_SHUTDOWN_PENDING)) {
12366                 /* got data while shutting down */
12367                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
12368                 *error = ECONNRESET;
12369                 goto out_now;
12370         }
12371         sctp_alloc_a_strmoq(stcb, sp);
12372         if (sp == NULL) {
12373                 SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12374                 *error = ENOMEM;
12375                 goto out_now;
12376         }
12377         sp->act_flags = 0;
12378         sp->sender_all_done = 0;
12379         sp->sinfo_flags = srcv->sinfo_flags;
12380         sp->timetolive = srcv->sinfo_timetolive;
12381         sp->ppid = srcv->sinfo_ppid;
12382         sp->context = srcv->sinfo_context;
12383         sp->fsn = 0;
12384         (void)SCTP_GETTIME_TIMEVAL(&sp->ts);
12385
12386         sp->sid = srcv->sinfo_stream;
12387         sp->length = (uint32_t)min(uio->uio_resid, max_send_len);
12388         if ((sp->length == (uint32_t)uio->uio_resid) &&
12389             ((user_marks_eor == 0) ||
12390             (srcv->sinfo_flags & SCTP_EOF) ||
12391             (user_marks_eor && (srcv->sinfo_flags & SCTP_EOR)))) {
12392                 sp->msg_is_complete = 1;
12393         } else {
12394                 sp->msg_is_complete = 0;
12395         }
12396         sp->sender_all_done = 0;
12397         sp->some_taken = 0;
12398         sp->put_last_out = 0;
12399         resv_in_first = SCTP_DATA_CHUNK_OVERHEAD(stcb);
12400         sp->data = sp->tail_mbuf = NULL;
12401         if (sp->length == 0) {
12402                 goto skip_copy;
12403         }
12404         if (srcv->sinfo_keynumber_valid) {
12405                 sp->auth_keyid = srcv->sinfo_keynumber;
12406         } else {
12407                 sp->auth_keyid = stcb->asoc.authinfo.active_keyid;
12408         }
12409         if (sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks)) {
12410                 sctp_auth_key_acquire(stcb, sp->auth_keyid);
12411                 sp->holds_key_ref = 1;
12412         }
12413         *error = sctp_copy_one(sp, uio, resv_in_first);
12414 skip_copy:
12415         if (*error) {
12416                 sctp_free_a_strmoq(stcb, sp, SCTP_SO_LOCKED);
12417                 sp = NULL;
12418         } else {
12419                 if (sp->sinfo_flags & SCTP_ADDR_OVER) {
12420                         sp->net = net;
12421                         atomic_add_int(&sp->net->ref_count, 1);
12422                 } else {
12423                         sp->net = NULL;
12424                 }
12425                 sctp_set_prsctp_policy(sp);
12426         }
12427 out_now:
12428         return (sp);
12429 }
12430
12431 int
12432 sctp_sosend(struct socket *so,
12433     struct sockaddr *addr,
12434     struct uio *uio,
12435     struct mbuf *top,
12436     struct mbuf *control,
12437     int flags,
12438     struct thread *p
12439 )
12440 {
12441         int error, use_sndinfo = 0;
12442         struct sctp_sndrcvinfo sndrcvninfo;
12443         struct sockaddr *addr_to_use;
12444 #if defined(INET) && defined(INET6)
12445         struct sockaddr_in sin;
12446 #endif
12447
12448         if (control) {
12449                 /* process cmsg snd/rcv info (maybe a assoc-id) */
12450                 if (sctp_find_cmsg(SCTP_SNDRCV, (void *)&sndrcvninfo, control,
12451                     sizeof(sndrcvninfo))) {
12452                         /* got one */
12453                         use_sndinfo = 1;
12454                 }
12455         }
12456         addr_to_use = addr;
12457 #if defined(INET) && defined(INET6)
12458         if ((addr != NULL) && (addr->sa_family == AF_INET6)) {
12459                 struct sockaddr_in6 *sin6;
12460
12461                 if (addr->sa_len != sizeof(struct sockaddr_in6)) {
12462                         SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12463                         return (EINVAL);
12464                 }
12465                 sin6 = (struct sockaddr_in6 *)addr;
12466                 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
12467                         in6_sin6_2_sin(&sin, sin6);
12468                         addr_to_use = (struct sockaddr *)&sin;
12469                 }
12470         }
12471 #endif
12472         error = sctp_lower_sosend(so, addr_to_use, uio, top,
12473             control,
12474             flags,
12475             use_sndinfo ? &sndrcvninfo : NULL
12476             ,p
12477             );
12478         return (error);
12479 }
12480
12481 int
12482 sctp_lower_sosend(struct socket *so,
12483     struct sockaddr *addr,
12484     struct uio *uio,
12485     struct mbuf *i_pak,
12486     struct mbuf *control,
12487     int flags,
12488     struct sctp_sndrcvinfo *srcv
12489     ,
12490     struct thread *p
12491 )
12492 {
12493         struct epoch_tracker et;
12494         ssize_t sndlen = 0, max_len, local_add_more;
12495         int error;
12496         struct mbuf *top = NULL;
12497         int queue_only = 0, queue_only_for_init = 0;
12498         int free_cnt_applied = 0;
12499         int un_sent;
12500         int now_filled = 0;
12501         unsigned int inqueue_bytes = 0;
12502         struct sctp_block_entry be;
12503         struct sctp_inpcb *inp;
12504         struct sctp_tcb *stcb = NULL;
12505         struct timeval now;
12506         struct sctp_nets *net;
12507         struct sctp_association *asoc;
12508         struct sctp_inpcb *t_inp;
12509         int user_marks_eor;
12510         int create_lock_applied = 0;
12511         int nagle_applies = 0;
12512         int some_on_control = 0;
12513         int got_all_of_the_send = 0;
12514         int hold_tcblock = 0;
12515         int non_blocking = 0;
12516         ssize_t local_soresv = 0;
12517         uint16_t port;
12518         uint16_t sinfo_flags;
12519         sctp_assoc_t sinfo_assoc_id;
12520
12521         error = 0;
12522         net = NULL;
12523         stcb = NULL;
12524         asoc = NULL;
12525
12526         t_inp = inp = (struct sctp_inpcb *)so->so_pcb;
12527         if (inp == NULL) {
12528                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12529                 error = EINVAL;
12530                 if (i_pak) {
12531                         SCTP_RELEASE_PKT(i_pak);
12532                 }
12533                 return (error);
12534         }
12535         if ((uio == NULL) && (i_pak == NULL)) {
12536                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12537                 return (EINVAL);
12538         }
12539         user_marks_eor = sctp_is_feature_on(inp, SCTP_PCB_FLAGS_EXPLICIT_EOR);
12540         atomic_add_int(&inp->total_sends, 1);
12541         if (uio) {
12542                 if (uio->uio_resid < 0) {
12543                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12544                         return (EINVAL);
12545                 }
12546                 sndlen = uio->uio_resid;
12547         } else {
12548                 top = SCTP_HEADER_TO_CHAIN(i_pak);
12549                 sndlen = SCTP_HEADER_LEN(i_pak);
12550         }
12551         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Send called addr:%p send length %zd\n",
12552             (void *)addr,
12553             sndlen);
12554         if ((inp->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) &&
12555             SCTP_IS_LISTENING(inp)) {
12556                 /* The listener can NOT send */
12557                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOTCONN);
12558                 error = ENOTCONN;
12559                 goto out_unlocked;
12560         }
12561         /**
12562          * Pre-screen address, if one is given the sin-len
12563          * must be set correctly!
12564          */
12565         if (addr) {
12566                 union sctp_sockstore *raddr = (union sctp_sockstore *)addr;
12567
12568                 switch (raddr->sa.sa_family) {
12569 #ifdef INET
12570                 case AF_INET:
12571                         if (raddr->sin.sin_len != sizeof(struct sockaddr_in)) {
12572                                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12573                                 error = EINVAL;
12574                                 goto out_unlocked;
12575                         }
12576                         port = raddr->sin.sin_port;
12577                         break;
12578 #endif
12579 #ifdef INET6
12580                 case AF_INET6:
12581                         if (raddr->sin6.sin6_len != sizeof(struct sockaddr_in6)) {
12582                                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12583                                 error = EINVAL;
12584                                 goto out_unlocked;
12585                         }
12586                         port = raddr->sin6.sin6_port;
12587                         break;
12588 #endif
12589                 default:
12590                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EAFNOSUPPORT);
12591                         error = EAFNOSUPPORT;
12592                         goto out_unlocked;
12593                 }
12594         } else
12595                 port = 0;
12596
12597         if (srcv) {
12598                 sinfo_flags = srcv->sinfo_flags;
12599                 sinfo_assoc_id = srcv->sinfo_assoc_id;
12600                 if (INVALID_SINFO_FLAG(sinfo_flags) ||
12601                     PR_SCTP_INVALID_POLICY(sinfo_flags)) {
12602                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12603                         error = EINVAL;
12604                         goto out_unlocked;
12605                 }
12606                 if (srcv->sinfo_flags)
12607                         SCTP_STAT_INCR(sctps_sends_with_flags);
12608         } else {
12609                 sinfo_flags = inp->def_send.sinfo_flags;
12610                 sinfo_assoc_id = inp->def_send.sinfo_assoc_id;
12611         }
12612         if (flags & MSG_EOR) {
12613                 sinfo_flags |= SCTP_EOR;
12614         }
12615         if (flags & MSG_EOF) {
12616                 sinfo_flags |= SCTP_EOF;
12617         }
12618         if (sinfo_flags & SCTP_SENDALL) {
12619                 /* its a sendall */
12620                 error = sctp_sendall(inp, uio, top, srcv);
12621                 top = NULL;
12622                 goto out_unlocked;
12623         }
12624         if ((sinfo_flags & SCTP_ADDR_OVER) && (addr == NULL)) {
12625                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12626                 error = EINVAL;
12627                 goto out_unlocked;
12628         }
12629         /* now we must find the assoc */
12630         if ((inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) ||
12631             (inp->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) {
12632                 SCTP_INP_RLOCK(inp);
12633                 stcb = LIST_FIRST(&inp->sctp_asoc_list);
12634                 if (stcb) {
12635                         SCTP_TCB_LOCK(stcb);
12636                         hold_tcblock = 1;
12637                 }
12638                 SCTP_INP_RUNLOCK(inp);
12639         } else if (sinfo_assoc_id) {
12640                 stcb = sctp_findassociation_ep_asocid(inp, sinfo_assoc_id, 1);
12641                 if (stcb != NULL) {
12642                         hold_tcblock = 1;
12643                 }
12644         } else if (addr) {
12645                 /*-
12646                  * Since we did not use findep we must
12647                  * increment it, and if we don't find a tcb
12648                  * decrement it.
12649                  */
12650                 SCTP_INP_WLOCK(inp);
12651                 SCTP_INP_INCR_REF(inp);
12652                 SCTP_INP_WUNLOCK(inp);
12653                 stcb = sctp_findassociation_ep_addr(&t_inp, addr, &net, NULL, NULL);
12654                 if (stcb == NULL) {
12655                         SCTP_INP_WLOCK(inp);
12656                         SCTP_INP_DECR_REF(inp);
12657                         SCTP_INP_WUNLOCK(inp);
12658                 } else {
12659                         hold_tcblock = 1;
12660                 }
12661         }
12662         if ((stcb == NULL) && (addr)) {
12663                 /* Possible implicit send? */
12664                 SCTP_ASOC_CREATE_LOCK(inp);
12665                 create_lock_applied = 1;
12666                 if ((inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) ||
12667                     (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE)) {
12668                         /* Should I really unlock ? */
12669                         SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12670                         error = EINVAL;
12671                         goto out_unlocked;
12672                 }
12673                 if (((inp->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) == 0) &&
12674                     (addr->sa_family == AF_INET6)) {
12675                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12676                         error = EINVAL;
12677                         goto out_unlocked;
12678                 }
12679                 SCTP_INP_WLOCK(inp);
12680                 SCTP_INP_INCR_REF(inp);
12681                 SCTP_INP_WUNLOCK(inp);
12682                 /* With the lock applied look again */
12683                 stcb = sctp_findassociation_ep_addr(&t_inp, addr, &net, NULL, NULL);
12684 #if defined(INET) || defined(INET6)
12685                 if ((stcb == NULL) && (control != NULL) && (port > 0)) {
12686                         stcb = sctp_findassociation_cmsgs(&t_inp, port, control, &net, &error);
12687                 }
12688 #endif
12689                 if (stcb == NULL) {
12690                         SCTP_INP_WLOCK(inp);
12691                         SCTP_INP_DECR_REF(inp);
12692                         SCTP_INP_WUNLOCK(inp);
12693                 } else {
12694                         hold_tcblock = 1;
12695                 }
12696                 if (error) {
12697                         goto out_unlocked;
12698                 }
12699                 if (t_inp != inp) {
12700                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOTCONN);
12701                         error = ENOTCONN;
12702                         goto out_unlocked;
12703                 }
12704         }
12705         if (stcb == NULL) {
12706                 if (addr == NULL) {
12707                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOENT);
12708                         error = ENOENT;
12709                         goto out_unlocked;
12710                 } else {
12711                         /* We must go ahead and start the INIT process */
12712                         uint32_t vrf_id;
12713
12714                         if ((sinfo_flags & SCTP_ABORT) ||
12715                             ((sinfo_flags & SCTP_EOF) && (sndlen == 0))) {
12716                                 /*-
12717                                  * User asks to abort a non-existent assoc,
12718                                  * or EOF a non-existent assoc with no data
12719                                  */
12720                                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOENT);
12721                                 error = ENOENT;
12722                                 goto out_unlocked;
12723                         }
12724                         /* get an asoc/stcb struct */
12725                         vrf_id = inp->def_vrf_id;
12726 #ifdef INVARIANTS
12727                         if (create_lock_applied == 0) {
12728                                 panic("Error, should hold create lock and I don't?");
12729                         }
12730 #endif
12731                         stcb = sctp_aloc_assoc_connected(inp, addr, &error, 0, 0, vrf_id,
12732                             inp->sctp_ep.pre_open_stream_count,
12733                             inp->sctp_ep.port,
12734                             p,
12735                             SCTP_INITIALIZE_AUTH_PARAMS);
12736                         if (stcb == NULL) {
12737                                 /* Error is setup for us in the call */
12738                                 goto out_unlocked;
12739                         }
12740                         hold_tcblock = 1;
12741                         if (create_lock_applied) {
12742                                 SCTP_ASOC_CREATE_UNLOCK(inp);
12743                                 create_lock_applied = 0;
12744                         } else {
12745                                 SCTP_PRINTF("Huh-3? create lock should have been on??\n");
12746                         }
12747                         /*
12748                          * Turn on queue only flag to prevent data from
12749                          * being sent
12750                          */
12751                         queue_only = 1;
12752                         asoc = &stcb->asoc;
12753                         SCTP_SET_STATE(stcb, SCTP_STATE_COOKIE_WAIT);
12754                         (void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered);
12755
12756                         if (control) {
12757                                 if (sctp_process_cmsgs_for_init(stcb, control, &error)) {
12758                                         sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
12759                                             SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_6);
12760                                         hold_tcblock = 0;
12761                                         stcb = NULL;
12762                                         goto out_unlocked;
12763                                 }
12764                         }
12765                         /* out with the INIT */
12766                         queue_only_for_init = 1;
12767                         /*-
12768                          * we may want to dig in after this call and adjust the MTU
12769                          * value. It defaulted to 1500 (constant) but the ro
12770                          * structure may now have an update and thus we may need to
12771                          * change it BEFORE we append the message.
12772                          */
12773                 }
12774         } else
12775                 asoc = &stcb->asoc;
12776         if (srcv == NULL) {
12777                 srcv = (struct sctp_sndrcvinfo *)&asoc->def_send;
12778                 sinfo_flags = srcv->sinfo_flags;
12779                 if (flags & MSG_EOR) {
12780                         sinfo_flags |= SCTP_EOR;
12781                 }
12782                 if (flags & MSG_EOF) {
12783                         sinfo_flags |= SCTP_EOF;
12784                 }
12785         }
12786         if (sinfo_flags & SCTP_ADDR_OVER) {
12787                 if (addr)
12788                         net = sctp_findnet(stcb, addr);
12789                 else
12790                         net = NULL;
12791                 if ((net == NULL) ||
12792                     ((port != 0) && (port != stcb->rport))) {
12793                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12794                         error = EINVAL;
12795                         goto out_unlocked;
12796                 }
12797         } else {
12798                 if (stcb->asoc.alternate) {
12799                         net = stcb->asoc.alternate;
12800                 } else {
12801                         net = stcb->asoc.primary_destination;
12802                 }
12803         }
12804         atomic_add_int(&stcb->total_sends, 1);
12805         /* Keep the stcb from being freed under our feet */
12806         atomic_add_int(&asoc->refcnt, 1);
12807         free_cnt_applied = 1;
12808
12809         if (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_NO_FRAGMENT)) {
12810                 if (sndlen > (ssize_t)asoc->smallest_mtu) {
12811                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EMSGSIZE);
12812                         error = EMSGSIZE;
12813                         goto out_unlocked;
12814                 }
12815         }
12816         if (SCTP_SO_IS_NBIO(so)
12817             || (flags & (MSG_NBIO | MSG_DONTWAIT)) != 0
12818             ) {
12819                 non_blocking = 1;
12820         }
12821         /* would we block? */
12822         if (non_blocking) {
12823                 ssize_t amount;
12824
12825                 if (hold_tcblock == 0) {
12826                         SCTP_TCB_LOCK(stcb);
12827                         hold_tcblock = 1;
12828                 }
12829                 inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * SCTP_DATA_CHUNK_OVERHEAD(stcb));
12830                 if (user_marks_eor == 0) {
12831                         amount = sndlen;
12832                 } else {
12833                         amount = 1;
12834                 }
12835                 if ((SCTP_SB_LIMIT_SND(so) < (amount + inqueue_bytes + stcb->asoc.sb_send_resv)) ||
12836                     (stcb->asoc.chunks_on_out_queue >= SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue))) {
12837                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EWOULDBLOCK);
12838                         if (sndlen > (ssize_t)SCTP_SB_LIMIT_SND(so))
12839                                 error = EMSGSIZE;
12840                         else
12841                                 error = EWOULDBLOCK;
12842                         goto out_unlocked;
12843                 }
12844                 stcb->asoc.sb_send_resv += (uint32_t)sndlen;
12845                 SCTP_TCB_UNLOCK(stcb);
12846                 hold_tcblock = 0;
12847         } else {
12848                 atomic_add_int(&stcb->asoc.sb_send_resv, (int)sndlen);
12849         }
12850         local_soresv = sndlen;
12851         if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
12852                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
12853                 error = ECONNRESET;
12854                 goto out_unlocked;
12855         }
12856         if (create_lock_applied) {
12857                 SCTP_ASOC_CREATE_UNLOCK(inp);
12858                 create_lock_applied = 0;
12859         }
12860         /* Is the stream no. valid? */
12861         if (srcv->sinfo_stream >= asoc->streamoutcnt) {
12862                 /* Invalid stream number */
12863                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12864                 error = EINVAL;
12865                 goto out_unlocked;
12866         }
12867         if ((asoc->strmout[srcv->sinfo_stream].state != SCTP_STREAM_OPEN) &&
12868             (asoc->strmout[srcv->sinfo_stream].state != SCTP_STREAM_OPENING)) {
12869                 /*
12870                  * Can't queue any data while stream reset is underway.
12871                  */
12872                 if (asoc->strmout[srcv->sinfo_stream].state > SCTP_STREAM_OPEN) {
12873                         error = EAGAIN;
12874                 } else {
12875                         error = EINVAL;
12876                 }
12877                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, error);
12878                 goto out_unlocked;
12879         }
12880         if ((SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_WAIT) ||
12881             (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)) {
12882                 queue_only = 1;
12883         }
12884         /* we are now done with all control */
12885         if (control) {
12886                 sctp_m_freem(control);
12887                 control = NULL;
12888         }
12889         if ((SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_SENT) ||
12890             (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_RECEIVED) ||
12891             (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_ACK_SENT) ||
12892             (asoc->state & SCTP_STATE_SHUTDOWN_PENDING)) {
12893                 if (sinfo_flags & SCTP_ABORT) {
12894                         ;
12895                 } else {
12896                         SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
12897                         error = ECONNRESET;
12898                         goto out_unlocked;
12899                 }
12900         }
12901         /* Ok, we will attempt a msgsnd :> */
12902         if (p) {
12903                 p->td_ru.ru_msgsnd++;
12904         }
12905         /* Are we aborting? */
12906         if (sinfo_flags & SCTP_ABORT) {
12907                 struct mbuf *mm;
12908                 ssize_t tot_demand, tot_out = 0, max_out;
12909
12910                 SCTP_STAT_INCR(sctps_sends_with_abort);
12911                 if ((SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_WAIT) ||
12912                     (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)) {
12913                         /* It has to be up before we abort */
12914                         /* how big is the user initiated abort? */
12915                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12916                         error = EINVAL;
12917                         goto out;
12918                 }
12919                 if (hold_tcblock) {
12920                         SCTP_TCB_UNLOCK(stcb);
12921                         hold_tcblock = 0;
12922                 }
12923                 if (top) {
12924                         struct mbuf *cntm = NULL;
12925
12926                         mm = sctp_get_mbuf_for_msg(sizeof(struct sctp_paramhdr), 0, M_WAITOK, 1, MT_DATA);
12927                         if (sndlen != 0) {
12928                                 for (cntm = top; cntm; cntm = SCTP_BUF_NEXT(cntm)) {
12929                                         tot_out += SCTP_BUF_LEN(cntm);
12930                                 }
12931                         }
12932                 } else {
12933                         /* Must fit in a MTU */
12934                         tot_out = sndlen;
12935                         tot_demand = (tot_out + sizeof(struct sctp_paramhdr));
12936                         if (tot_demand > SCTP_DEFAULT_ADD_MORE) {
12937                                 /* To big */
12938                                 SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EMSGSIZE);
12939                                 error = EMSGSIZE;
12940                                 goto out;
12941                         }
12942                         mm = sctp_get_mbuf_for_msg((unsigned int)tot_demand, 0, M_WAITOK, 1, MT_DATA);
12943                 }
12944                 if (mm == NULL) {
12945                         SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12946                         error = ENOMEM;
12947                         goto out;
12948                 }
12949                 max_out = asoc->smallest_mtu - sizeof(struct sctp_paramhdr);
12950                 max_out -= sizeof(struct sctp_abort_msg);
12951                 if (tot_out > max_out) {
12952                         tot_out = max_out;
12953                 }
12954                 if (mm) {
12955                         struct sctp_paramhdr *ph;
12956
12957                         /* now move forward the data pointer */
12958                         ph = mtod(mm, struct sctp_paramhdr *);
12959                         ph->param_type = htons(SCTP_CAUSE_USER_INITIATED_ABT);
12960                         ph->param_length = htons((uint16_t)(sizeof(struct sctp_paramhdr) + tot_out));
12961                         ph++;
12962                         SCTP_BUF_LEN(mm) = (int)(tot_out + sizeof(struct sctp_paramhdr));
12963                         if (top == NULL) {
12964                                 error = uiomove((caddr_t)ph, (int)tot_out, uio);
12965                                 if (error) {
12966                                         /*-
12967                                          * Here if we can't get his data we
12968                                          * still abort we just don't get to
12969                                          * send the users note :-0
12970                                          */
12971                                         sctp_m_freem(mm);
12972                                         mm = NULL;
12973                                 }
12974                         } else {
12975                                 if (sndlen != 0) {
12976                                         SCTP_BUF_NEXT(mm) = top;
12977                                 }
12978                         }
12979                 }
12980                 if (hold_tcblock == 0) {
12981                         SCTP_TCB_LOCK(stcb);
12982                 }
12983                 atomic_add_int(&stcb->asoc.refcnt, -1);
12984                 free_cnt_applied = 0;
12985                 /* release this lock, otherwise we hang on ourselves */
12986                 NET_EPOCH_ENTER(et);
12987                 sctp_abort_an_association(stcb->sctp_ep, stcb, mm, false, SCTP_SO_LOCKED);
12988                 NET_EPOCH_EXIT(et);
12989                 /* now relock the stcb so everything is sane */
12990                 hold_tcblock = 0;
12991                 stcb = NULL;
12992                 /*
12993                  * In this case top is already chained to mm avoid double
12994                  * free, since we free it below if top != NULL and driver
12995                  * would free it after sending the packet out
12996                  */
12997                 if (sndlen != 0) {
12998                         top = NULL;
12999                 }
13000                 goto out_unlocked;
13001         }
13002         /* Calculate the maximum we can send */
13003         inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * SCTP_DATA_CHUNK_OVERHEAD(stcb));
13004         if (SCTP_SB_LIMIT_SND(so) > inqueue_bytes) {
13005                 max_len = SCTP_SB_LIMIT_SND(so) - inqueue_bytes;
13006         } else {
13007                 max_len = 0;
13008         }
13009         if (hold_tcblock) {
13010                 SCTP_TCB_UNLOCK(stcb);
13011                 hold_tcblock = 0;
13012         }
13013         if (asoc->strmout == NULL) {
13014                 /* huh? software error */
13015                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EFAULT);
13016                 error = EFAULT;
13017                 goto out_unlocked;
13018         }
13019
13020         /* Unless E_EOR mode is on, we must make a send FIT in one call. */
13021         if ((user_marks_eor == 0) &&
13022             (sndlen > (ssize_t)SCTP_SB_LIMIT_SND(stcb->sctp_socket))) {
13023                 /* It will NEVER fit */
13024                 SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EMSGSIZE);
13025                 error = EMSGSIZE;
13026                 goto out_unlocked;
13027         }
13028         if ((uio == NULL) && user_marks_eor) {
13029                 /*-
13030                  * We do not support eeor mode for
13031                  * sending with mbuf chains (like sendfile).
13032                  */
13033                 SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
13034                 error = EINVAL;
13035                 goto out_unlocked;
13036         }
13037
13038         if (user_marks_eor) {
13039                 local_add_more = (ssize_t)min(SCTP_SB_LIMIT_SND(so), SCTP_BASE_SYSCTL(sctp_add_more_threshold));
13040         } else {
13041                 /*-
13042                  * For non-eeor the whole message must fit in
13043                  * the socket send buffer.
13044                  */
13045                 local_add_more = sndlen;
13046         }
13047         if (non_blocking) {
13048                 goto skip_preblock;
13049         }
13050         if (((max_len <= local_add_more) &&
13051             ((ssize_t)SCTP_SB_LIMIT_SND(so) >= local_add_more)) ||
13052             (max_len == 0) ||
13053             ((stcb->asoc.chunks_on_out_queue + stcb->asoc.stream_queue_cnt) >= SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue))) {
13054                 /* No room right now ! */
13055                 SOCKBUF_LOCK(&so->so_snd);
13056                 inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * SCTP_DATA_CHUNK_OVERHEAD(stcb));
13057                 while ((SCTP_SB_LIMIT_SND(so) < (inqueue_bytes + local_add_more)) ||
13058                     ((stcb->asoc.stream_queue_cnt + stcb->asoc.chunks_on_out_queue) >= SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue))) {
13059                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "pre_block limit:%u <(inq:%d + %zd) || (%d+%d > %d)\n",
13060                             (unsigned int)SCTP_SB_LIMIT_SND(so),
13061                             inqueue_bytes,
13062                             local_add_more,
13063                             stcb->asoc.stream_queue_cnt,
13064                             stcb->asoc.chunks_on_out_queue,
13065                             SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue));
13066                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13067                                 sctp_log_block(SCTP_BLOCK_LOG_INTO_BLKA, asoc, sndlen);
13068                         }
13069                         be.error = 0;
13070                         stcb->block_entry = &be;
13071                         error = sbwait(&so->so_snd);
13072                         stcb->block_entry = NULL;
13073                         if (error || so->so_error || be.error) {
13074                                 if (error == 0) {
13075                                         if (so->so_error)
13076                                                 error = so->so_error;
13077                                         if (be.error) {
13078                                                 error = be.error;
13079                                         }
13080                                 }
13081                                 SOCKBUF_UNLOCK(&so->so_snd);
13082                                 goto out_unlocked;
13083                         }
13084                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13085                                 sctp_log_block(SCTP_BLOCK_LOG_OUTOF_BLK,
13086                                     asoc, stcb->asoc.total_output_queue_size);
13087                         }
13088                         if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
13089                                 SOCKBUF_UNLOCK(&so->so_snd);
13090                                 goto out_unlocked;
13091                         }
13092                         inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * SCTP_DATA_CHUNK_OVERHEAD(stcb));
13093                 }
13094                 if (SCTP_SB_LIMIT_SND(so) > inqueue_bytes) {
13095                         max_len = SCTP_SB_LIMIT_SND(so) - inqueue_bytes;
13096                 } else {
13097                         max_len = 0;
13098                 }
13099                 SOCKBUF_UNLOCK(&so->so_snd);
13100         }
13101
13102 skip_preblock:
13103         if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
13104                 goto out_unlocked;
13105         }
13106         /*
13107          * sndlen covers for mbuf case uio_resid covers for the non-mbuf
13108          * case NOTE: uio will be null when top/mbuf is passed
13109          */
13110         if (sndlen == 0) {
13111                 if (sinfo_flags & SCTP_EOF) {
13112                         got_all_of_the_send = 1;
13113                         goto dataless_eof;
13114                 } else {
13115                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
13116                         error = EINVAL;
13117                         goto out;
13118                 }
13119         }
13120         if (top == NULL) {
13121                 struct sctp_stream_queue_pending *sp;
13122                 struct sctp_stream_out *strm;
13123                 uint32_t sndout;
13124
13125                 SCTP_TCB_SEND_LOCK(stcb);
13126                 if ((asoc->stream_locked) &&
13127                     (asoc->stream_locked_on != srcv->sinfo_stream)) {
13128                         SCTP_TCB_SEND_UNLOCK(stcb);
13129                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
13130                         error = EINVAL;
13131                         goto out;
13132                 }
13133                 strm = &stcb->asoc.strmout[srcv->sinfo_stream];
13134                 if (strm->last_msg_incomplete == 0) {
13135         do_a_copy_in:
13136                         SCTP_TCB_SEND_UNLOCK(stcb);
13137                         sp = sctp_copy_it_in(stcb, asoc, srcv, uio, net, max_len, user_marks_eor, &error);
13138                         if (error) {
13139                                 goto out;
13140                         }
13141                         SCTP_TCB_SEND_LOCK(stcb);
13142                         /* The out streams might be reallocated. */
13143                         strm = &stcb->asoc.strmout[srcv->sinfo_stream];
13144                         if (sp->msg_is_complete) {
13145                                 strm->last_msg_incomplete = 0;
13146                                 asoc->stream_locked = 0;
13147                         } else {
13148                                 /*
13149                                  * Just got locked to this guy in case of an
13150                                  * interrupt.
13151                                  */
13152                                 strm->last_msg_incomplete = 1;
13153                                 if (stcb->asoc.idata_supported == 0) {
13154                                         asoc->stream_locked = 1;
13155                                         asoc->stream_locked_on = srcv->sinfo_stream;
13156                                 }
13157                                 sp->sender_all_done = 0;
13158                         }
13159                         sctp_snd_sb_alloc(stcb, sp->length);
13160                         atomic_add_int(&asoc->stream_queue_cnt, 1);
13161                         if (sinfo_flags & SCTP_UNORDERED) {
13162                                 SCTP_STAT_INCR(sctps_sends_with_unord);
13163                         }
13164                         sp->processing = 1;
13165                         TAILQ_INSERT_TAIL(&strm->outqueue, sp, next);
13166                         stcb->asoc.ss_functions.sctp_ss_add_to_stream(stcb, asoc, strm, sp);
13167                 } else {
13168                         sp = TAILQ_LAST(&strm->outqueue, sctp_streamhead);
13169                         if (sp == NULL) {
13170                                 /* ???? Huh ??? last msg is gone */
13171 #ifdef INVARIANTS
13172                                 panic("Warning: Last msg marked incomplete, yet nothing left?");
13173 #else
13174                                 SCTP_PRINTF("Warning: Last msg marked incomplete, yet nothing left?\n");
13175                                 strm->last_msg_incomplete = 0;
13176 #endif
13177                                 goto do_a_copy_in;
13178                         }
13179                         if (sp->processing) {
13180                                 SCTP_TCB_SEND_UNLOCK(stcb);
13181                                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
13182                                 error = EINVAL;
13183                                 goto out;
13184                         } else {
13185                                 sp->processing = 1;
13186                         }
13187                 }
13188                 SCTP_TCB_SEND_UNLOCK(stcb);
13189                 while (uio->uio_resid > 0) {
13190                         /* How much room do we have? */
13191                         struct mbuf *new_tail, *mm;
13192
13193                         inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * SCTP_DATA_CHUNK_OVERHEAD(stcb));
13194                         if (SCTP_SB_LIMIT_SND(so) > inqueue_bytes)
13195                                 max_len = SCTP_SB_LIMIT_SND(so) - inqueue_bytes;
13196                         else
13197                                 max_len = 0;
13198
13199                         if ((max_len > (ssize_t)SCTP_BASE_SYSCTL(sctp_add_more_threshold)) ||
13200                             (max_len && (SCTP_SB_LIMIT_SND(so) < SCTP_BASE_SYSCTL(sctp_add_more_threshold))) ||
13201                             (uio->uio_resid && (uio->uio_resid <= max_len))) {
13202                                 sndout = 0;
13203                                 new_tail = NULL;
13204                                 if (hold_tcblock) {
13205                                         SCTP_TCB_UNLOCK(stcb);
13206                                         hold_tcblock = 0;
13207                                 }
13208                                 mm = sctp_copy_resume(uio, (int)max_len, user_marks_eor, &error, &sndout, &new_tail);
13209                                 if ((mm == NULL) || error) {
13210                                         if (mm) {
13211                                                 sctp_m_freem(mm);
13212                                         }
13213                                         SCTP_TCB_SEND_LOCK(stcb);
13214                                         if (((stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) == 0) &&
13215                                             ((stcb->asoc.state & SCTP_STATE_WAS_ABORTED) == 0) &&
13216                                             (sp != NULL)) {
13217                                                 sp->processing = 0;
13218                                         }
13219                                         SCTP_TCB_SEND_UNLOCK(stcb);
13220                                         goto out;
13221                                 }
13222                                 /* Update the mbuf and count */
13223                                 SCTP_TCB_SEND_LOCK(stcb);
13224                                 if ((stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) ||
13225                                     (stcb->asoc.state & SCTP_STATE_WAS_ABORTED)) {
13226                                         /*
13227                                          * we need to get out. Peer probably
13228                                          * aborted.
13229                                          */
13230                                         sctp_m_freem(mm);
13231                                         if (stcb->asoc.state & SCTP_STATE_WAS_ABORTED) {
13232                                                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
13233                                                 error = ECONNRESET;
13234                                         }
13235                                         SCTP_TCB_SEND_UNLOCK(stcb);
13236                                         goto out;
13237                                 }
13238                                 if (sp->tail_mbuf) {
13239                                         /* tack it to the end */
13240                                         SCTP_BUF_NEXT(sp->tail_mbuf) = mm;
13241                                         sp->tail_mbuf = new_tail;
13242                                 } else {
13243                                         /* A stolen mbuf */
13244                                         sp->data = mm;
13245                                         sp->tail_mbuf = new_tail;
13246                                 }
13247                                 sctp_snd_sb_alloc(stcb, sndout);
13248                                 atomic_add_int(&sp->length, sndout);
13249                                 if (sinfo_flags & SCTP_SACK_IMMEDIATELY) {
13250                                         sp->sinfo_flags |= SCTP_SACK_IMMEDIATELY;
13251                                 }
13252
13253                                 /* Did we reach EOR? */
13254                                 if ((uio->uio_resid == 0) &&
13255                                     ((user_marks_eor == 0) ||
13256                                     (sinfo_flags & SCTP_EOF) ||
13257                                     (user_marks_eor && (sinfo_flags & SCTP_EOR)))) {
13258                                         sp->msg_is_complete = 1;
13259                                 } else {
13260                                         sp->msg_is_complete = 0;
13261                                 }
13262                                 SCTP_TCB_SEND_UNLOCK(stcb);
13263                         }
13264                         if (uio->uio_resid == 0) {
13265                                 /* got it all? */
13266                                 continue;
13267                         }
13268                         /* PR-SCTP? */
13269                         if ((asoc->prsctp_supported) && (asoc->sent_queue_cnt_removeable > 0)) {
13270                                 /*
13271                                  * This is ugly but we must assure locking
13272                                  * order
13273                                  */
13274                                 if (hold_tcblock == 0) {
13275                                         SCTP_TCB_LOCK(stcb);
13276                                         hold_tcblock = 1;
13277                                 }
13278                                 sctp_prune_prsctp(stcb, asoc, srcv, (int)sndlen);
13279                                 inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * SCTP_DATA_CHUNK_OVERHEAD(stcb));
13280                                 if (SCTP_SB_LIMIT_SND(so) > inqueue_bytes)
13281                                         max_len = SCTP_SB_LIMIT_SND(so) - inqueue_bytes;
13282                                 else
13283                                         max_len = 0;
13284                                 if (max_len > 0) {
13285                                         continue;
13286                                 }
13287                                 SCTP_TCB_UNLOCK(stcb);
13288                                 hold_tcblock = 0;
13289                         }
13290                         /* wait for space now */
13291                         if (non_blocking) {
13292                                 /* Non-blocking io in place out */
13293                                 SCTP_TCB_SEND_LOCK(stcb);
13294                                 if (sp != NULL) {
13295                                         sp->processing = 0;
13296                                 }
13297                                 SCTP_TCB_SEND_UNLOCK(stcb);
13298                                 goto skip_out_eof;
13299                         }
13300                         /* What about the INIT, send it maybe */
13301                         if (queue_only_for_init) {
13302                                 if (hold_tcblock == 0) {
13303                                         SCTP_TCB_LOCK(stcb);
13304                                         hold_tcblock = 1;
13305                                 }
13306                                 if (SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) {
13307                                         /* a collision took us forward? */
13308                                         queue_only = 0;
13309                                 } else {
13310                                         NET_EPOCH_ENTER(et);
13311                                         sctp_send_initiate(inp, stcb, SCTP_SO_LOCKED);
13312                                         NET_EPOCH_EXIT(et);
13313                                         SCTP_SET_STATE(stcb, SCTP_STATE_COOKIE_WAIT);
13314                                         queue_only = 1;
13315                                 }
13316                         }
13317                         if ((net->flight_size > net->cwnd) &&
13318                             (asoc->sctp_cmt_on_off == 0)) {
13319                                 SCTP_STAT_INCR(sctps_send_cwnd_avoid);
13320                                 queue_only = 1;
13321                         } else if (asoc->ifp_had_enobuf) {
13322                                 SCTP_STAT_INCR(sctps_ifnomemqueued);
13323                                 if (net->flight_size > (2 * net->mtu)) {
13324                                         queue_only = 1;
13325                                 }
13326                                 asoc->ifp_had_enobuf = 0;
13327                         }
13328                         un_sent = stcb->asoc.total_output_queue_size - stcb->asoc.total_flight;
13329                         if ((sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY)) &&
13330                             (stcb->asoc.total_flight > 0) &&
13331                             (stcb->asoc.stream_queue_cnt < SCTP_MAX_DATA_BUNDLING) &&
13332                             (un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD))) {
13333                                 /*-
13334                                  * Ok, Nagle is set on and we have data outstanding.
13335                                  * Don't send anything and let SACKs drive out the
13336                                  * data unless we have a "full" segment to send.
13337                                  */
13338                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
13339                                         sctp_log_nagle_event(stcb, SCTP_NAGLE_APPLIED);
13340                                 }
13341                                 SCTP_STAT_INCR(sctps_naglequeued);
13342                                 nagle_applies = 1;
13343                         } else {
13344                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
13345                                         if (sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY))
13346                                                 sctp_log_nagle_event(stcb, SCTP_NAGLE_SKIPPED);
13347                                 }
13348                                 SCTP_STAT_INCR(sctps_naglesent);
13349                                 nagle_applies = 0;
13350                         }
13351                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13352                                 sctp_misc_ints(SCTP_CWNDLOG_PRESEND, queue_only_for_init, queue_only,
13353                                     nagle_applies, un_sent);
13354                                 sctp_misc_ints(SCTP_CWNDLOG_PRESEND, stcb->asoc.total_output_queue_size,
13355                                     stcb->asoc.total_flight,
13356                                     stcb->asoc.chunks_on_out_queue, stcb->asoc.total_flight_count);
13357                         }
13358                         if (queue_only_for_init)
13359                                 queue_only_for_init = 0;
13360                         if ((queue_only == 0) && (nagle_applies == 0)) {
13361                                 /*-
13362                                  * need to start chunk output
13363                                  * before blocking.. note that if
13364                                  * a lock is already applied, then
13365                                  * the input via the net is happening
13366                                  * and I don't need to start output :-D
13367                                  */
13368                                 NET_EPOCH_ENTER(et);
13369                                 if (hold_tcblock == 0) {
13370                                         if (SCTP_TCB_TRYLOCK(stcb)) {
13371                                                 hold_tcblock = 1;
13372                                                 sctp_chunk_output(inp,
13373                                                     stcb,
13374                                                     SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13375                                         }
13376                                 } else {
13377                                         sctp_chunk_output(inp,
13378                                             stcb,
13379                                             SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13380                                 }
13381                                 NET_EPOCH_EXIT(et);
13382                         }
13383                         if (hold_tcblock == 1) {
13384                                 SCTP_TCB_UNLOCK(stcb);
13385                                 hold_tcblock = 0;
13386                         }
13387                         SOCKBUF_LOCK(&so->so_snd);
13388                         /*-
13389                          * This is a bit strange, but I think it will
13390                          * work. The total_output_queue_size is locked and
13391                          * protected by the TCB_LOCK, which we just released.
13392                          * There is a race that can occur between releasing it
13393                          * above, and me getting the socket lock, where sacks
13394                          * come in but we have not put the SB_WAIT on the
13395                          * so_snd buffer to get the wakeup. After the LOCK
13396                          * is applied the sack_processing will also need to
13397                          * LOCK the so->so_snd to do the actual sowwakeup(). So
13398                          * once we have the socket buffer lock if we recheck the
13399                          * size we KNOW we will get to sleep safely with the
13400                          * wakeup flag in place.
13401                          */
13402                         inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * SCTP_DATA_CHUNK_OVERHEAD(stcb));
13403                         if (SCTP_SB_LIMIT_SND(so) <= (inqueue_bytes +
13404                             min(SCTP_BASE_SYSCTL(sctp_add_more_threshold), SCTP_SB_LIMIT_SND(so)))) {
13405                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13406                                         sctp_log_block(SCTP_BLOCK_LOG_INTO_BLK,
13407                                             asoc, uio->uio_resid);
13408                                 }
13409                                 be.error = 0;
13410                                 stcb->block_entry = &be;
13411                                 error = sbwait(&so->so_snd);
13412                                 stcb->block_entry = NULL;
13413
13414                                 if (error || so->so_error || be.error) {
13415                                         if (error == 0) {
13416                                                 if (so->so_error)
13417                                                         error = so->so_error;
13418                                                 if (be.error) {
13419                                                         error = be.error;
13420                                                 }
13421                                         }
13422                                         SOCKBUF_UNLOCK(&so->so_snd);
13423                                         SCTP_TCB_SEND_LOCK(stcb);
13424                                         if (((stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) == 0) &&
13425                                             ((stcb->asoc.state & SCTP_STATE_WAS_ABORTED) == 0) &&
13426                                             (sp != NULL)) {
13427                                                 sp->processing = 0;
13428                                         }
13429                                         SCTP_TCB_SEND_UNLOCK(stcb);
13430                                         goto out_unlocked;
13431                                 }
13432
13433                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13434                                         sctp_log_block(SCTP_BLOCK_LOG_OUTOF_BLK,
13435                                             asoc, stcb->asoc.total_output_queue_size);
13436                                 }
13437                         }
13438                         SOCKBUF_UNLOCK(&so->so_snd);
13439                         SCTP_TCB_SEND_LOCK(stcb);
13440                         if ((stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) ||
13441                             (stcb->asoc.state & SCTP_STATE_WAS_ABORTED)) {
13442                                 SCTP_TCB_SEND_UNLOCK(stcb);
13443                                 goto out_unlocked;
13444                         }
13445                         SCTP_TCB_SEND_UNLOCK(stcb);
13446                 }
13447                 SCTP_TCB_SEND_LOCK(stcb);
13448                 if ((stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) ||
13449                     (stcb->asoc.state & SCTP_STATE_WAS_ABORTED)) {
13450                         SCTP_TCB_SEND_UNLOCK(stcb);
13451                         goto out_unlocked;
13452                 }
13453                 if (sp) {
13454                         if (sp->msg_is_complete == 0) {
13455                                 strm->last_msg_incomplete = 1;
13456                                 if (stcb->asoc.idata_supported == 0) {
13457                                         asoc->stream_locked = 1;
13458                                         asoc->stream_locked_on = srcv->sinfo_stream;
13459                                 }
13460                         } else {
13461                                 sp->sender_all_done = 1;
13462                                 strm->last_msg_incomplete = 0;
13463                                 asoc->stream_locked = 0;
13464                         }
13465                         sp->processing = 0;
13466                 } else {
13467                         SCTP_PRINTF("Huh no sp TSNH?\n");
13468                         strm->last_msg_incomplete = 0;
13469                         asoc->stream_locked = 0;
13470                 }
13471                 SCTP_TCB_SEND_UNLOCK(stcb);
13472                 if (uio->uio_resid == 0) {
13473                         got_all_of_the_send = 1;
13474                 }
13475         } else {
13476                 /* We send in a 0, since we do NOT have any locks */
13477                 error = sctp_msg_append(stcb, net, top, srcv, 0);
13478                 top = NULL;
13479                 if (sinfo_flags & SCTP_EOF) {
13480                         got_all_of_the_send = 1;
13481                 }
13482         }
13483         if (error) {
13484                 goto out;
13485         }
13486 dataless_eof:
13487         /* EOF thing ? */
13488         if ((sinfo_flags & SCTP_EOF) &&
13489             (got_all_of_the_send == 1)) {
13490                 SCTP_STAT_INCR(sctps_sends_with_eof);
13491                 error = 0;
13492                 if (hold_tcblock == 0) {
13493                         SCTP_TCB_LOCK(stcb);
13494                         hold_tcblock = 1;
13495                 }
13496                 if (TAILQ_EMPTY(&asoc->send_queue) &&
13497                     TAILQ_EMPTY(&asoc->sent_queue) &&
13498                     sctp_is_there_unsent_data(stcb, SCTP_SO_LOCKED) == 0) {
13499                         if ((*asoc->ss_functions.sctp_ss_is_user_msgs_incomplete) (stcb, asoc)) {
13500                                 goto abort_anyway;
13501                         }
13502                         /* there is nothing queued to send, so I'm done... */
13503                         if ((SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_SENT) &&
13504                             (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
13505                             (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
13506                                 struct sctp_nets *netp;
13507
13508                                 /* only send SHUTDOWN the first time through */
13509                                 if (SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) {
13510                                         SCTP_STAT_DECR_GAUGE32(sctps_currestab);
13511                                 }
13512                                 SCTP_SET_STATE(stcb, SCTP_STATE_SHUTDOWN_SENT);
13513                                 sctp_stop_timers_for_shutdown(stcb);
13514                                 if (stcb->asoc.alternate) {
13515                                         netp = stcb->asoc.alternate;
13516                                 } else {
13517                                         netp = stcb->asoc.primary_destination;
13518                                 }
13519                                 sctp_send_shutdown(stcb, netp);
13520                                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb,
13521                                     netp);
13522                                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
13523                                     NULL);
13524                         }
13525                 } else {
13526                         /*-
13527                          * we still got (or just got) data to send, so set
13528                          * SHUTDOWN_PENDING
13529                          */
13530                         /*-
13531                          * XXX sockets draft says that SCTP_EOF should be
13532                          * sent with no data.  currently, we will allow user
13533                          * data to be sent first and move to
13534                          * SHUTDOWN-PENDING
13535                          */
13536                         if ((SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_SENT) &&
13537                             (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
13538                             (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
13539                                 if (hold_tcblock == 0) {
13540                                         SCTP_TCB_LOCK(stcb);
13541                                         hold_tcblock = 1;
13542                                 }
13543                                 if ((*asoc->ss_functions.sctp_ss_is_user_msgs_incomplete) (stcb, asoc)) {
13544                                         SCTP_ADD_SUBSTATE(stcb, SCTP_STATE_PARTIAL_MSG_LEFT);
13545                                 }
13546                                 SCTP_ADD_SUBSTATE(stcb, SCTP_STATE_SHUTDOWN_PENDING);
13547                                 if (TAILQ_EMPTY(&asoc->send_queue) &&
13548                                     TAILQ_EMPTY(&asoc->sent_queue) &&
13549                                     (asoc->state & SCTP_STATE_PARTIAL_MSG_LEFT)) {
13550                                         struct mbuf *op_err;
13551                                         char msg[SCTP_DIAG_INFO_LEN];
13552
13553                         abort_anyway:
13554                                         if (free_cnt_applied) {
13555                                                 atomic_add_int(&stcb->asoc.refcnt, -1);
13556                                                 free_cnt_applied = 0;
13557                                         }
13558                                         SCTP_SNPRINTF(msg, sizeof(msg),
13559                                             "%s:%d at %s", __FILE__, __LINE__, __func__);
13560                                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
13561                                             msg);
13562                                         NET_EPOCH_ENTER(et);
13563                                         sctp_abort_an_association(stcb->sctp_ep, stcb,
13564                                             op_err, false, SCTP_SO_LOCKED);
13565                                         NET_EPOCH_EXIT(et);
13566                                         /*
13567                                          * now relock the stcb so everything
13568                                          * is sane
13569                                          */
13570                                         hold_tcblock = 0;
13571                                         stcb = NULL;
13572                                         goto out;
13573                                 }
13574                                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
13575                                     NULL);
13576                                 sctp_feature_off(inp, SCTP_PCB_FLAGS_NODELAY);
13577                         }
13578                 }
13579         }
13580 skip_out_eof:
13581         if (!TAILQ_EMPTY(&stcb->asoc.control_send_queue)) {
13582                 some_on_control = 1;
13583         }
13584         if (queue_only_for_init) {
13585                 if (hold_tcblock == 0) {
13586                         SCTP_TCB_LOCK(stcb);
13587                         hold_tcblock = 1;
13588                 }
13589                 if (SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) {
13590                         /* a collision took us forward? */
13591                         queue_only = 0;
13592                 } else {
13593                         NET_EPOCH_ENTER(et);
13594                         sctp_send_initiate(inp, stcb, SCTP_SO_LOCKED);
13595                         NET_EPOCH_EXIT(et);
13596                         SCTP_SET_STATE(stcb, SCTP_STATE_COOKIE_WAIT);
13597                         queue_only = 1;
13598                 }
13599         }
13600         if ((net->flight_size > net->cwnd) &&
13601             (stcb->asoc.sctp_cmt_on_off == 0)) {
13602                 SCTP_STAT_INCR(sctps_send_cwnd_avoid);
13603                 queue_only = 1;
13604         } else if (asoc->ifp_had_enobuf) {
13605                 SCTP_STAT_INCR(sctps_ifnomemqueued);
13606                 if (net->flight_size > (2 * net->mtu)) {
13607                         queue_only = 1;
13608                 }
13609                 asoc->ifp_had_enobuf = 0;
13610         }
13611         un_sent = stcb->asoc.total_output_queue_size - stcb->asoc.total_flight;
13612         if ((sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY)) &&
13613             (stcb->asoc.total_flight > 0) &&
13614             (stcb->asoc.stream_queue_cnt < SCTP_MAX_DATA_BUNDLING) &&
13615             (un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD))) {
13616                 /*-
13617                  * Ok, Nagle is set on and we have data outstanding.
13618                  * Don't send anything and let SACKs drive out the
13619                  * data unless wen have a "full" segment to send.
13620                  */
13621                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
13622                         sctp_log_nagle_event(stcb, SCTP_NAGLE_APPLIED);
13623                 }
13624                 SCTP_STAT_INCR(sctps_naglequeued);
13625                 nagle_applies = 1;
13626         } else {
13627                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
13628                         if (sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY))
13629                                 sctp_log_nagle_event(stcb, SCTP_NAGLE_SKIPPED);
13630                 }
13631                 SCTP_STAT_INCR(sctps_naglesent);
13632                 nagle_applies = 0;
13633         }
13634         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13635                 sctp_misc_ints(SCTP_CWNDLOG_PRESEND, queue_only_for_init, queue_only,
13636                     nagle_applies, un_sent);
13637                 sctp_misc_ints(SCTP_CWNDLOG_PRESEND, stcb->asoc.total_output_queue_size,
13638                     stcb->asoc.total_flight,
13639                     stcb->asoc.chunks_on_out_queue, stcb->asoc.total_flight_count);
13640         }
13641         NET_EPOCH_ENTER(et);
13642         if ((queue_only == 0) && (nagle_applies == 0) && (stcb->asoc.peers_rwnd && un_sent)) {
13643                 /* we can attempt to send too. */
13644                 if (hold_tcblock == 0) {
13645                         /*
13646                          * If there is activity recv'ing sacks no need to
13647                          * send
13648                          */
13649                         if (SCTP_TCB_TRYLOCK(stcb)) {
13650                                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13651                                 hold_tcblock = 1;
13652                         }
13653                 } else {
13654                         sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13655                 }
13656         } else if ((queue_only == 0) &&
13657                     (stcb->asoc.peers_rwnd == 0) &&
13658             (stcb->asoc.total_flight == 0)) {
13659                 /* We get to have a probe outstanding */
13660                 if (hold_tcblock == 0) {
13661                         hold_tcblock = 1;
13662                         SCTP_TCB_LOCK(stcb);
13663                 }
13664                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13665         } else if (some_on_control) {
13666                 int num_out, reason, frag_point;
13667
13668                 /* Here we do control only */
13669                 if (hold_tcblock == 0) {
13670                         hold_tcblock = 1;
13671                         SCTP_TCB_LOCK(stcb);
13672                 }
13673                 frag_point = sctp_get_frag_point(stcb, &stcb->asoc);
13674                 (void)sctp_med_chunk_output(inp, stcb, &stcb->asoc, &num_out,
13675                     &reason, 1, 1, &now, &now_filled, frag_point, SCTP_SO_LOCKED);
13676         }
13677         NET_EPOCH_EXIT(et);
13678         SCTPDBG(SCTP_DEBUG_OUTPUT1, "USR Send complete qo:%d prw:%d unsent:%d tf:%d cooq:%d toqs:%d err:%d\n",
13679             queue_only, stcb->asoc.peers_rwnd, un_sent,
13680             stcb->asoc.total_flight, stcb->asoc.chunks_on_out_queue,
13681             stcb->asoc.total_output_queue_size, error);
13682
13683 out:
13684 out_unlocked:
13685
13686         if (local_soresv && stcb) {
13687                 atomic_subtract_int(&stcb->asoc.sb_send_resv, (int)sndlen);
13688         }
13689         if (create_lock_applied) {
13690                 SCTP_ASOC_CREATE_UNLOCK(inp);
13691         }
13692         if ((stcb) && hold_tcblock) {
13693                 SCTP_TCB_UNLOCK(stcb);
13694         }
13695         if (stcb && free_cnt_applied) {
13696                 atomic_add_int(&stcb->asoc.refcnt, -1);
13697         }
13698 #ifdef INVARIANTS
13699         if (stcb) {
13700                 if (mtx_owned(&stcb->tcb_mtx)) {
13701                         panic("Leaving with tcb mtx owned?");
13702                 }
13703                 if (mtx_owned(&stcb->tcb_send_mtx)) {
13704                         panic("Leaving with tcb send mtx owned?");
13705                 }
13706         }
13707 #endif
13708         if (top) {
13709                 sctp_m_freem(top);
13710         }
13711         if (control) {
13712                 sctp_m_freem(control);
13713         }
13714         return (error);
13715 }
13716
13717 /*
13718  * generate an AUTHentication chunk, if required
13719  */
13720 struct mbuf *
13721 sctp_add_auth_chunk(struct mbuf *m, struct mbuf **m_end,
13722     struct sctp_auth_chunk **auth_ret, uint32_t *offset,
13723     struct sctp_tcb *stcb, uint8_t chunk)
13724 {
13725         struct mbuf *m_auth;
13726         struct sctp_auth_chunk *auth;
13727         int chunk_len;
13728         struct mbuf *cn;
13729
13730         if ((m_end == NULL) || (auth_ret == NULL) || (offset == NULL) ||
13731             (stcb == NULL))
13732                 return (m);
13733
13734         if (stcb->asoc.auth_supported == 0) {
13735                 return (m);
13736         }
13737         /* does the requested chunk require auth? */
13738         if (!sctp_auth_is_required_chunk(chunk, stcb->asoc.peer_auth_chunks)) {
13739                 return (m);
13740         }
13741         m_auth = sctp_get_mbuf_for_msg(sizeof(*auth), 0, M_NOWAIT, 1, MT_HEADER);
13742         if (m_auth == NULL) {
13743                 /* no mbuf's */
13744                 return (m);
13745         }
13746         /* reserve some space if this will be the first mbuf */
13747         if (m == NULL)
13748                 SCTP_BUF_RESV_UF(m_auth, SCTP_MIN_OVERHEAD);
13749         /* fill in the AUTH chunk details */
13750         auth = mtod(m_auth, struct sctp_auth_chunk *);
13751         memset(auth, 0, sizeof(*auth));
13752         auth->ch.chunk_type = SCTP_AUTHENTICATION;
13753         auth->ch.chunk_flags = 0;
13754         chunk_len = sizeof(*auth) +
13755             sctp_get_hmac_digest_len(stcb->asoc.peer_hmac_id);
13756         auth->ch.chunk_length = htons(chunk_len);
13757         auth->hmac_id = htons(stcb->asoc.peer_hmac_id);
13758         /* key id and hmac digest will be computed and filled in upon send */
13759
13760         /* save the offset where the auth was inserted into the chain */
13761         *offset = 0;
13762         for (cn = m; cn; cn = SCTP_BUF_NEXT(cn)) {
13763                 *offset += SCTP_BUF_LEN(cn);
13764         }
13765
13766         /* update length and return pointer to the auth chunk */
13767         SCTP_BUF_LEN(m_auth) = chunk_len;
13768         m = sctp_copy_mbufchain(m_auth, m, m_end, 1, chunk_len, 0);
13769         if (auth_ret != NULL)
13770                 *auth_ret = auth;
13771
13772         return (m);
13773 }
13774
13775 #ifdef INET6
13776 int
13777 sctp_v6src_match_nexthop(struct sockaddr_in6 *src6, sctp_route_t *ro)
13778 {
13779         struct nd_prefix *pfx = NULL;
13780         struct nd_pfxrouter *pfxrtr = NULL;
13781         struct sockaddr_in6 gw6;
13782
13783         if (ro == NULL || ro->ro_nh == NULL || src6->sin6_family != AF_INET6)
13784                 return (0);
13785
13786         /* get prefix entry of address */
13787         ND6_RLOCK();
13788         LIST_FOREACH(pfx, &MODULE_GLOBAL(nd_prefix), ndpr_entry) {
13789                 if (pfx->ndpr_stateflags & NDPRF_DETACHED)
13790                         continue;
13791                 if (IN6_ARE_MASKED_ADDR_EQUAL(&pfx->ndpr_prefix.sin6_addr,
13792                     &src6->sin6_addr, &pfx->ndpr_mask))
13793                         break;
13794         }
13795         /* no prefix entry in the prefix list */
13796         if (pfx == NULL) {
13797                 ND6_RUNLOCK();
13798                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "No prefix entry for ");
13799                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)src6);
13800                 return (0);
13801         }
13802
13803         SCTPDBG(SCTP_DEBUG_OUTPUT2, "v6src_match_nexthop(), Prefix entry is ");
13804         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)src6);
13805
13806         /* search installed gateway from prefix entry */
13807         LIST_FOREACH(pfxrtr, &pfx->ndpr_advrtrs, pfr_entry) {
13808                 memset(&gw6, 0, sizeof(struct sockaddr_in6));
13809                 gw6.sin6_family = AF_INET6;
13810                 gw6.sin6_len = sizeof(struct sockaddr_in6);
13811                 memcpy(&gw6.sin6_addr, &pfxrtr->router->rtaddr,
13812                     sizeof(struct in6_addr));
13813                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "prefix router is ");
13814                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)&gw6);
13815                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "installed router is ");
13816                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, &ro->ro_nh->gw_sa);
13817                 if (sctp_cmpaddr((struct sockaddr *)&gw6, &ro->ro_nh->gw_sa)) {
13818                         ND6_RUNLOCK();
13819                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "pfxrouter is installed\n");
13820                         return (1);
13821                 }
13822         }
13823         ND6_RUNLOCK();
13824         SCTPDBG(SCTP_DEBUG_OUTPUT2, "pfxrouter is not installed\n");
13825         return (0);
13826 }
13827 #endif
13828
13829 int
13830 sctp_v4src_match_nexthop(struct sctp_ifa *sifa, sctp_route_t *ro)
13831 {
13832 #ifdef INET
13833         struct sockaddr_in *sin, *mask;
13834         struct ifaddr *ifa;
13835         struct in_addr srcnetaddr, gwnetaddr;
13836
13837         if (ro == NULL || ro->ro_nh == NULL ||
13838             sifa->address.sa.sa_family != AF_INET) {
13839                 return (0);
13840         }
13841         ifa = (struct ifaddr *)sifa->ifa;
13842         mask = (struct sockaddr_in *)(ifa->ifa_netmask);
13843         sin = &sifa->address.sin;
13844         srcnetaddr.s_addr = (sin->sin_addr.s_addr & mask->sin_addr.s_addr);
13845         SCTPDBG(SCTP_DEBUG_OUTPUT1, "match_nexthop4: src address is ");
13846         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, &sifa->address.sa);
13847         SCTPDBG(SCTP_DEBUG_OUTPUT1, "network address is %x\n", srcnetaddr.s_addr);
13848
13849         sin = &ro->ro_nh->gw4_sa;
13850         gwnetaddr.s_addr = (sin->sin_addr.s_addr & mask->sin_addr.s_addr);
13851         SCTPDBG(SCTP_DEBUG_OUTPUT1, "match_nexthop4: nexthop is ");
13852         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, &ro->ro_nh->gw_sa);
13853         SCTPDBG(SCTP_DEBUG_OUTPUT1, "network address is %x\n", gwnetaddr.s_addr);
13854         if (srcnetaddr.s_addr == gwnetaddr.s_addr) {
13855                 return (1);
13856         }
13857 #endif
13858         return (0);
13859 }